TY - JOUR T1 - Trace element (strontium, barium, rubidium and lithium) analyses by ChemCam for the first 360 sols in Gale Crater, Mars AN - 1752579456; 2016-002559 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Ollila, A M AU - Newsom, H E AU - Wiens, R C AU - Maurice, S AU - Sautter, V AU - Mangold, N AU - Clark, B C AU - Vaniman, D AU - Blank, J G AU - Bridges, J C AU - Cousin, A AU - Tokar, R L AU - Gasnault, Olivier AU - Forni, Olivier AU - Lasue, Jeremie AU - Anderson, R B AU - Clegg, S M AU - Dyar, M D AU - Fabre, C AU - Lanza, N L AU - Rosen-Gooding, A AU - Anonymous Y1 - 2014 PY - 2014 DA - 2014 EP - Abstract no. 2490 PB - Lunar and Planetary Science Conference, Houston, TX VL - 45 KW - silicates KW - calcium sulfate KW - Mars KW - Gale Crater KW - emission spectra KW - sedimentary rocks KW - barium KW - alkali feldspar KW - Curiosity Rover KW - LIBS spectra KW - framework silicates KW - spectra KW - trace elements KW - ChemCam instrument KW - alkaline earth metals KW - plagioclase KW - sulfates KW - lithium KW - rubidium KW - alkali metals KW - clasts KW - veins KW - conglomerate KW - terrestrial planets KW - planets KW - metals KW - Mars Science Laboratory KW - feldspar group KW - clastic rocks KW - strontium KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1752579456?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Trace+element+%28strontium%2C+barium%2C+rubidium+and+lithium%29+analyses+by+ChemCam+for+the+first+360+sols+in+Gale+Crater%2C+Mars&rft.au=Ollila%2C+A+M%3BNewsom%2C+H+E%3BWiens%2C+R+C%3BMaurice%2C+S%3BSautter%2C+V%3BMangold%2C+N%3BClark%2C+B+C%3BVaniman%2C+D%3BBlank%2C+J+G%3BBridges%2C+J+C%3BCousin%2C+A%3BTokar%2C+R+L%3BGasnault%2C+Olivier%3BForni%2C+Olivier%3BLasue%2C+Jeremie%3BAnderson%2C+R+B%3BClegg%2C+S+M%3BDyar%2C+M+D%3BFabre%2C+C%3BLanza%2C+N+L%3BRosen-Gooding%2C+A%3BAnonymous&rft.aulast=Ollila&rft.aufirst=A&rft.date=2014-01-01&rft.volume=45&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - www.hou.usra.edu/meetings/lpsc2014/pdf/2490.pdf LA - English DB - GeoRef N1 - Conference title - 45th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 5 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Jul. 8, 2015 N1 - Last updated - 2015-12-31 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali feldspar; alkali metals; alkaline earth metals; barium; calcium sulfate; ChemCam instrument; clastic rocks; clasts; conglomerate; Curiosity Rover; emission spectra; feldspar group; framework silicates; Gale Crater; LIBS spectra; lithium; Mars; Mars Science Laboratory; metals; plagioclase; planets; rubidium; sedimentary rocks; silicates; spectra; strontium; sulfates; terrestrial planets; trace elements; veins ER - TY - JOUR T1 - ChemCam results from the Shaler outcrop in Gale Crater, Mars AN - 1752578762; 2016-002556 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Anderson, R B AU - Edgar, L A AU - Bridges, J C AU - Williams, A J AU - Williams, J M AU - Ollila, A AU - Forni, Olivier AU - Mangold, N AU - Lanza, N L AU - Sautter, V AU - Gupta, S AU - Blaney, Diana L AU - Clark, B C AU - Clegg, S M AU - Dromart, G AU - Gasnault, Olivier AU - Lasue, Jeremie AU - Le Mouelic, Stephane AU - Leveille, R AU - Lewin, E AU - Lewis, K AU - Maurice, S AU - Nachon, Marion AU - Newsom, H AU - Vaniman, D AU - Wiens, R C AU - Anonymous Y1 - 2014 PY - 2014 DA - 2014 EP - Abstract no. 2380 PB - Lunar and Planetary Science Conference, Houston, TX VL - 45 KW - silicates KW - alteration KW - magnesium KW - Glenelg Member KW - Shaler Member KW - Mars KW - iron KW - Gale Crater KW - emission spectra KW - pyroxene group KW - mineral composition KW - aluminum KW - sediments KW - LIBS spectra KW - spectra KW - chemical composition KW - basaltic composition KW - chain silicates KW - Yellowknife Bay KW - ChemCam instrument KW - chemical weathering KW - alkaline earth metals KW - alkali metals KW - weathering KW - Sheepbed Mudstone KW - terrestrial planets KW - provenance KW - planets KW - metals KW - potassium KW - facies KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1752578762?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=ChemCam+results+from+the+Shaler+outcrop+in+Gale+Crater%2C+Mars&rft.au=Anderson%2C+R+B%3BEdgar%2C+L+A%3BBridges%2C+J+C%3BWilliams%2C+A+J%3BWilliams%2C+J+M%3BOllila%2C+A%3BForni%2C+Olivier%3BMangold%2C+N%3BLanza%2C+N+L%3BSautter%2C+V%3BGupta%2C+S%3BBlaney%2C+Diana+L%3BClark%2C+B+C%3BClegg%2C+S+M%3BDromart%2C+G%3BGasnault%2C+Olivier%3BLasue%2C+Jeremie%3BLe+Mouelic%2C+Stephane%3BLeveille%2C+R%3BLewin%2C+E%3BLewis%2C+K%3BMaurice%2C+S%3BNachon%2C+Marion%3BNewsom%2C+H%3BVaniman%2C+D%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Anderson&rft.aufirst=R&rft.date=2014-01-01&rft.volume=45&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - www.hou.usra.edu/meetings/lpsc2014/pdf/2380.pdf LA - English DB - GeoRef N1 - Conference title - 45th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Jul. 8, 2015 N1 - Last updated - 2016-05-19 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali metals; alkaline earth metals; alteration; aluminum; basaltic composition; chain silicates; ChemCam instrument; chemical composition; chemical weathering; emission spectra; facies; Gale Crater; Glenelg Member; iron; LIBS spectra; magnesium; Mars; metals; mineral composition; planets; potassium; provenance; pyroxene group; sediments; Shaler Member; Sheepbed Mudstone; silicates; spectra; terrestrial planets; weathering; Yellowknife Bay ER - TY - JOUR T1 - Silica-Fe-rich components of rocks, Gale Crater, Mars AN - 1752578236; 2016-002554 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Fisk, M R AU - Dyar, M D AU - Cousin, A AU - Bridges, N T AU - Bridges, J C AU - Anderson, R B AU - Johnson, J AU - Blaney, Diana L AU - Mangold, N AU - Herkenhoff, K E AU - Weins, R AU - Clegg, S M AU - Meslin, P Y AU - Gasnault, Olivier AU - Forni, Olivier AU - Clark, B C AU - Pinet, P AU - Anonymous Y1 - 2014 PY - 2014 DA - 2014 EP - Abstract no. 1674 PB - Lunar and Planetary Science Conference, Houston, TX VL - 45 KW - silicates KW - calcium KW - magnesium KW - Mars KW - iron-rich composition KW - silicon KW - iron KW - Gale Crater KW - emission spectra KW - silica KW - aluminum KW - LIBS spectra KW - framework silicates KW - spectra KW - stoichiometry KW - rocks KW - ChemCam instrument KW - alkaline earth metals KW - alkali metals KW - sodium KW - terrestrial planets KW - aqueous alteration KW - planets KW - titanium KW - metals KW - potassium KW - Mars Science Laboratory KW - feldspar group KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1752578236?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Silica-Fe-rich+components+of+rocks%2C+Gale+Crater%2C+Mars&rft.au=Fisk%2C+M+R%3BDyar%2C+M+D%3BCousin%2C+A%3BBridges%2C+N+T%3BBridges%2C+J+C%3BAnderson%2C+R+B%3BJohnson%2C+J%3BBlaney%2C+Diana+L%3BMangold%2C+N%3BHerkenhoff%2C+K+E%3BWeins%2C+R%3BClegg%2C+S+M%3BMeslin%2C+P+Y%3BGasnault%2C+Olivier%3BForni%2C+Olivier%3BClark%2C+B+C%3BPinet%2C+P%3BAnonymous&rft.aulast=Fisk&rft.aufirst=M&rft.date=2014-01-01&rft.volume=45&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - www.hou.usra.edu/meetings/lpsc2014/pdf/1674.pdf LA - English DB - GeoRef N1 - Conference title - 45th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 2 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Jul. 8, 2015 N1 - Last updated - 2015-12-31 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali metals; alkaline earth metals; aluminum; aqueous alteration; calcium; ChemCam instrument; emission spectra; feldspar group; framework silicates; Gale Crater; iron; iron-rich composition; LIBS spectra; magnesium; Mars; Mars Science Laboratory; metals; planets; potassium; rocks; silica; silicates; silicon; sodium; spectra; stoichiometry; terrestrial planets; titanium ER - TY - JOUR T1 - An overview of the Los Alamos PHO mitigation project AN - 1734266307; 2015-108192 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Weaver, R P AU - Gisler, G R AU - Plesko, C S AU - Anonymous Y1 - 2014 PY - 2014 DA - 2014 EP - Abstract no. 1107 PB - Lunar and Planetary Science Conference, Houston, TX VL - 45 KW - United States KW - programs KW - asteroids KW - explosions KW - New Mexico KW - Los Alamos County New Mexico KW - Los Alamos National Laboratory KW - simulation KW - potentially hazardous objects KW - mitigation KW - Earth-crossing orbits KW - comets KW - natural hazards KW - hydrodynamics KW - nuclear explosions KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1734266307?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=An+overview+of+the+Los+Alamos+PHO+mitigation+project&rft.au=Weaver%2C+R+P%3BGisler%2C+G+R%3BPlesko%2C+C+S%3BAnonymous&rft.aulast=Weaver&rft.aufirst=R&rft.date=2014-01-01&rft.volume=45&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - www.hou.usra.edu/meetings/lpsc2014/pdf/1107.pdf LA - English DB - GeoRef N1 - Conference title - 45th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. N1 - Date revised - 2015-01-01 N1 - Number of references - 7 N1 - PubXState - TX N1 - SuppNotes - Accessed on Jun. 9, 2015 N1 - Last updated - 2015-11-19 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - asteroids; comets; Earth-crossing orbits; explosions; hydrodynamics; Los Alamos County New Mexico; Los Alamos National Laboratory; mitigation; natural hazards; New Mexico; nuclear explosions; potentially hazardous objects; programs; simulation; United States ER - TY - JOUR T1 - Surface monitoring of dune changes from MSL; current results and upcoming campaigns AN - 1641011582; 2015-002283 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Bridges, Nathan T AU - Le Mouelic, S AU - Herkenhoff, K E AU - Fisk, M AU - Newman, C AU - Maurice, S AU - Rubin, D M AU - Wiens, R C AU - Anonymous Y1 - 2014 PY - 2014 DA - 2014 EP - Abstract 1849 PB - Lunar and Planetary Science Conference, Houston, TX VL - 45 KW - eolian features KW - high-resolution methods KW - imagery KW - dunes KW - monitoring KW - Mars KW - ripple marks KW - bedforms KW - Gale Crater KW - terrestrial planets KW - planets KW - bedding plane irregularities KW - mosaics KW - Mars Science Laboratory KW - HiRISE KW - dune fields KW - sedimentary structures KW - color imagery KW - Bagnold dune field KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641011582?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Surface+monitoring+of+dune+changes+from+MSL%3B+current+results+and+upcoming+campaigns&rft.au=Bridges%2C+Nathan+T%3BLe+Mouelic%2C+S%3BHerkenhoff%2C+K+E%3BFisk%2C+M%3BNewman%2C+C%3BMaurice%2C+S%3BRubin%2C+D+M%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Bridges&rft.aufirst=Nathan&rft.date=2014-01-01&rft.volume=45&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.hou.usra.edu/meetings/lpsc2014/pdf/1849.pdf LA - English DB - GeoRef N1 - Conference title - 45th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. N1 - Date revised - 2015-01-01 N1 - Number of references - 12 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on June 2, 2014 N1 - Last updated - 2014-12-31 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Bagnold dune field; bedding plane irregularities; bedforms; color imagery; dune fields; dunes; eolian features; Gale Crater; high-resolution methods; HiRISE; imagery; Mars; Mars Science Laboratory; monitoring; mosaics; planets; ripple marks; sedimentary structures; terrestrial planets ER - TY - JOUR T1 - First fluorine detection on Mars with ChemCam on-board MSL AN - 1641011180; 2015-002339 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Forni, Olivier AU - Gaft, M AU - Toplis, M AU - Clegg, S M AU - Ollila, A AU - Sautter, V AU - Nachon, M AU - Gasnault, O AU - Mangold, N AU - Maurice, S AU - Meslin, P Y AU - Schroeder, S AU - Wiens, R C AU - Blaney, D AU - Cousin, A AU - DeFlores, L P AU - Vaniman, D T AU - Anonymous Y1 - 2014 PY - 2014 DA - 2014 EP - Abstract 1328 PB - Lunar and Planetary Science Conference, Houston, TX VL - 45 KW - halides KW - chlorine KW - calcium chloride KW - sodium chloride KW - fluorides KW - ChemCam data KW - halogens KW - mantle KW - Mars KW - phosphates KW - emission spectra KW - terrestrial planets KW - planets KW - detection KW - fluorine KW - volatile elements KW - Mars Science Laboratory KW - LIBS spectra KW - spectra KW - fluorapatite KW - fluorite KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641011180?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=First+fluorine+detection+on+Mars+with+ChemCam+on-board+MSL&rft.au=Forni%2C+Olivier%3BGaft%2C+M%3BToplis%2C+M%3BClegg%2C+S+M%3BOllila%2C+A%3BSautter%2C+V%3BNachon%2C+M%3BGasnault%2C+O%3BMangold%2C+N%3BMaurice%2C+S%3BMeslin%2C+P+Y%3BSchroeder%2C+S%3BWiens%2C+R+C%3BBlaney%2C+D%3BCousin%2C+A%3BDeFlores%2C+L+P%3BVaniman%2C+D+T%3BAnonymous&rft.aulast=Forni&rft.aufirst=Olivier&rft.date=2014-01-01&rft.volume=45&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.hou.usra.edu/meetings/lpsc2014/pdf/1328.pdf LA - English DB - GeoRef N1 - Conference title - 45th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. N1 - Date revised - 2015-01-01 N1 - Number of references - 16 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on June 6, 2014 N1 - Last updated - 2015-04-16 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - calcium chloride; ChemCam data; chlorine; detection; emission spectra; fluorapatite; fluorides; fluorine; fluorite; halides; halogens; LIBS spectra; mantle; Mars; Mars Science Laboratory; phosphates; planets; sodium chloride; spectra; terrestrial planets; volatile elements ER - TY - JOUR T1 - Gale Crater and impact processes from Curiosity AN - 1549617314; 2014-060112 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Newsom, H E AU - Kah, L C AU - Mangold, N AU - Williams, J M AU - Ollila, A M AU - Arvidson, R E AU - Stein, N AU - Bridges, J C AU - Schwenzer, S P AU - Spray, J G AU - Grant, J A AU - Calef, F J AU - King, P L AU - Bridges, N T AU - Wiens, R C AU - Vaniman, D T AU - Anonymous Y1 - 2014 PY - 2014 DA - 2014 EP - Abstract 2103 PB - Lunar and Planetary Science Conference, Houston, TX VL - 45 KW - silicates KW - cratering KW - imagery KW - degradation KW - impact features KW - resurfacing KW - Mars KW - erosion rates KW - Gale Crater KW - metamorphic rocks KW - Curiosity Rover KW - spherules KW - Yellowknife Bay KW - size-frequency distribution KW - impactites KW - rates KW - MAHLI KW - size KW - Mars Hand Lens Imager KW - clay minerals KW - terrestrial planets KW - planets KW - Hummocky Plains KW - sheet silicates KW - impact craters KW - regolith KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549617314?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Gale+Crater+and+impact+processes+from+Curiosity&rft.au=Newsom%2C+H+E%3BKah%2C+L+C%3BMangold%2C+N%3BWilliams%2C+J+M%3BOllila%2C+A+M%3BArvidson%2C+R+E%3BStein%2C+N%3BBridges%2C+J+C%3BSchwenzer%2C+S+P%3BSpray%2C+J+G%3BGrant%2C+J+A%3BCalef%2C+F+J%3BKing%2C+P+L%3BBridges%2C+N+T%3BWiens%2C+R+C%3BVaniman%2C+D+T%3BAnonymous&rft.aulast=Newsom&rft.aufirst=H&rft.date=2014-01-01&rft.volume=45&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.hou.usra.edu/meetings/lpsc2014/pdf/2103.pdf LA - English DB - GeoRef N1 - Conference title - 45th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 8 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on May 1, 2014 N1 - Last updated - 2014-07-31 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - clay minerals; cratering; Curiosity Rover; degradation; erosion rates; Gale Crater; Hummocky Plains; imagery; impact craters; impact features; impactites; MAHLI; Mars; Mars Hand Lens Imager; metamorphic rocks; planets; rates; regolith; resurfacing; sheet silicates; silicates; size; size-frequency distribution; spherules; terrestrial planets; Yellowknife Bay ER - TY - JOUR T1 - Combined Rayleigh- and Love-Wave Magnitudes for Seismic Event Discrimination and Screening Analysis AN - 1802203381; 20333015 AB - Love waves have the potential to aid in discrimination for anomalous explosion events. We develop a calibrated mathematical formulation for an explosion discriminant that combines Rayleigh- and Love-wave magnitude values and employs an error model that correctly partitions variances among events and stations separately. The discriminant is calibrated using a global data set of 124 earthquakes and 26 nuclear explosions and applied to the May 2009 Democratic Republic of North Korea (DPRK) announced nuclear test, as well as the calibration data set. All 26 explosions were correctly identified; only 6 earthquakes were incorrectly identified as explosions. Compared to an analogous treatment using only Rayleigh data, the combined discriminant improves the DPRK event p-value only nominally but reduces the number of false positives in the calibration data set by 70%, with no additional false negatives. While not dramatically improving the discrimination power for anomalous events, such as the 2009 DPRK test, the combined discriminant proposed here offers improved screening capabilities for typical events.Online Material: Earthquake and explosion calibration data set. JF - Bulletin of the Seismological Society of America. Berkeley CA AU - MacCarthy, Jonathan K AU - Anderson, Dale N AU - Bonner, Jessie L AD - EES-17 Geophysics Group, MS DF665, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, jkmacc@lanl.gov Y1 - 2013/12/12/ PY - 2013 DA - 2013 Dec 12 SP - 3334 EP - 3340 PB - Seismological Society of America VL - 103 IS - 6 SN - 0037-1106, 0037-1106 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Earthquakes KW - Screening KW - Biological surveys KW - Mathematical models KW - Explosions KW - Love waves KW - Calibrations KW - Waves KW - Nuclear explosions KW - Nuclear Explosions KW - Modelling KW - Q2 09270:Seismology KW - SW 0810:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1802203381?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America.+Berkeley+CA&rft.atitle=Combined+Rayleigh-+and+Love-Wave+Magnitudes+for+Seismic+Event+Discrimination+and+Screening+Analysis&rft.au=MacCarthy%2C+Jonathan+K%3BAnderson%2C+Dale+N%3BBonner%2C+Jessie+L&rft.aulast=MacCarthy&rft.aufirst=Jonathan&rft.date=2013-12-12&rft.volume=103&rft.issue=6&rft.spage=3334&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America.+Berkeley+CA&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120130065 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-07-01 N1 - Last updated - 2016-12-22 N1 - SubjectsTermNotLitGenreText - Biological surveys; Screening; Earthquakes; Mathematical models; Love waves; Nuclear explosions; Explosions; Modelling; Calibrations; Waves; Nuclear Explosions DO - http://dx.doi.org/10.1785/0120130065 ER - TY - CPAPER T1 - First regional vertical profiles of CO2: Can we verify reported emissions? T2 - 46th American Geophysical Union Fall Meeting AN - 1493792487; 6258567 JF - 46th American Geophysical Union Fall Meeting AU - Lindenmaier, Rodica AU - Hase, Frank AU - Dubey, Manvendra AU - Lee, Sang-Hyun AU - Costigan, Keeley AU - Henderson, Bradley Y1 - 2013/12/09/ PY - 2013 DA - 2013 Dec 09 KW - Emissions UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1493792487?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=46th+American+Geophysical+Union+Fall+Meeting&rft.atitle=First+regional+vertical+profiles+of+CO2%3A+Can+we+verify+reported+emissions%3F&rft.au=Lindenmaier%2C+Rodica%3BHase%2C+Frank%3BDubey%2C+Manvendra%3BLee%2C+Sang-Hyun%3BCostigan%2C+Keeley%3BHenderson%2C+Bradley&rft.aulast=Lindenmaier&rft.aufirst=Rodica&rft.date=2013-12-09&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=46th+American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://agu-fm13.abstractcentral.com/planner.jsp LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-31 N1 - Last updated - 2014-02-10 ER - TY - JOUR T1 - Is there a relationship between basal reservoir injection and induced seismicity? AN - 1707526323; 2015-080767 AB - Most of the Mb 3.8-5.7 seismic events that are believed to have been caused by brine disposal in the midcontinent region, USA resulted from injection of fluid either into a basal sedimentary reservoir with no underlying confining unit or directly into the underlying crystalline basement complex. The earthquakes occurred within the crystalline basement quite likely along faults that were critically stressed. These faults were located at considerable distances (up to 10 km) from the injection wells and head increases at the hypocenters were likely relatively small (we estimate between about 70-150 m above hydrostatic levels). We present a suite of idealized simulations that use a simple hydrogeologic-geomechanical model to assess what hydrogeologic conditions promote or deter induced seismic events within the crystalline basement across the midcontinent. The presence of a confining unit beneath the injection reservoir horizon had the single largest effect in preventing induced seismicity within the underlying crystalline basement. For the case of crystalline basement having a permeability of 2.0E-17 m (super 2) , a specific storage coefficient of 1.0E-7 m (super -1) , and an injection at a rate of 5455 m (super 3) /day into the basal aquifer with no underlying basal seal over 10 years, probable brittle failure occurs to depths of about 0.6 km below the injection reservoir. Including a permeable (k (sub z) = 1.0E-13 m (super 2) ,) Precambrian normal fault, located 20 m from the injection well, increased the depth of the failure region below the reservoir to 3 km. For a large permeability contrast between a Precambrian thrust fault (1.0E-12 m (super 2) ,) and the surrounding crystalline basement (1.0E-18 m (super 2) ), the failure region can extend laterally 10 km away from the injection well. We also present a more site-specific analysis of pore pressure development and seismicity associated with multiple deep injection wells in Ohio. JF - American Geophysical Union Fall Meeting AU - Person, M A AU - Evans, J P AU - Petrie, E AU - Mozley, P AU - Zhang, Y AU - Gable, C W AU - Kelkar, S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S32C EP - 04 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707526323?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Is+there+a+relationship+between+basal+reservoir+injection+and+induced+seismicity%3F&rft.au=Person%2C+M+A%3BEvans%2C+J+P%3BPetrie%2C+E%3BMozley%2C+P%3BZhang%2C+Y%3BGable%2C+C+W%3BKelkar%2C+S%3BAnonymous&rft.aulast=Person&rft.aufirst=M&rft.date=2013-12-01&rft.volume=25&rft.issue=3&rft.spage=184&rft.isbn=&rft.btitle=&rft.title=Journal+of+Computing+in+Civil+Engineering&rft.issn=08873801&rft_id=info:doi/10.1061%2F%28ASCE%29CP.1943-5487.0000064 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Application of a regional seismic travel time model to event detection and location at the International Data Centre AN - 1707526295; 2015-080688 AB - A key element of the verification regime established to monitor the Comprehensive Nuclear-Test-Ban Treaty is a system operated by the International Data Centre (IDC) to detect and locate global seismicity. The process of event detection and location rely on accurate travel-time models to both associate signals from a network of sensors and locate an event. Furthermore, the Treaty provides for on-site inspection, which presumes an accurate event location. To confidently monitor the treaty at low magnitudes, the use of regional seismic data (the Pn, Pg, Sn, Lg arrival times) is essential; however, the effective use of such data requires an earth model that includes the effects of lateral variations. Myers et al., 2010, present a framework (the Regional Seismic Travel Time, or RSTT model) to efficiently model the regional seismic travel times. The RSTT model is based on approximations that are necessary for an efficient operational implementation. It is a global framework, which simplifies the management of a laterally varying model for a global network. The approximations in RSTT also lead to a tomographic formulation that allows for the model to be updated as new data become available. The IDC has integrated the RSTT model into its operational algorithms. There are, however, significant challenges involving efficiency and accuracy that must be addressed before applying the model routinely. To ensure that including the RSTT model will be feasible, RSTT is used to calculate source-specific-station corrections, which are maps of the deviation from a global 1D model for each phase and station. This is the mechanism the IDC uses to efficiently correct for lateral variations and, therefore, the computational impact of using RSTT is known. The accuracy of the RSTT model is validated by comparing with ground-truth event locations. It is also important to understand where the approximation breaks down, in particular at larger distances or along anomalous paths, and reflect the accuracy in the regionally dependent model errors. Large-scale tests of the association algorithm using RSTT validate the effectiveness of applying the model. JF - American Geophysical Union Fall Meeting AU - Given, J W AU - Fan, G AU - Bobrov, D AU - Myers, S C AU - Begnaud, M L AU - Ballard, S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S24B EP - 06 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707526295?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Application+of+a+regional+seismic+travel+time+model+to+event+detection+and+location+at+the+International+Data+Centre&rft.au=Given%2C+J+W%3BFan%2C+G%3BBobrov%2C+D%3BMyers%2C+S+C%3BBegnaud%2C+M+L%3BBallard%2C+S%3BAnonymous&rft.aulast=Given&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Using the international monitoring system to validate SALSA3D; a global 3D P-velocity model of the crust and mantle for improved seismic event location AN - 1707526129; 2015-080599 AB - We demonstrate the ability of SALSA3D (SAndia LoS Alamos 3D) version 2.1, a global 3D P-wave velocity model of the Earth's crust and mantle, to reduce mislocations compared to those derived from standard 1D and 2-2.5D models, for a set of realizations using only IMS stations - an example of a sparse network whose locations depend heavily on the velocity model employed - and a carefully chosen group of globally-distributed ground truth (GT) events. Our model is derived from the latest version of the GT catalog of P/Pn travel-time picks assembled by Los Alamos National Laboratory. The model uses the GeoTess triangular tessellation system described by Ballard et al. (2009; www.sandia.gov/geotess), which incorporates variable resolution both laterally and radially. For our starting model, we use a simplified version of the NNSA Unified model in Eurasia and the Crust 2.0 model elsewhere. Damping reduces velocity adjustments so that ray path changes between iterations are small. We obtain proper model smoothness via progressive grid refinement using the diagonal of the model resolution matrix to determine where the data warrant such a refinement. Our approach provides more consistent and continuous areas of refinement, producing a smooth, multi-resolution model with node density appropriate to both ray coverage and the velocity gradients required by the data. This scheme is computationally expensive, so we use a distributed computing framework of nearly equal 400 processors. The global IMS network consists of approximately 150 primary and auxiliary stations, forming a pre-defined, sparse network with which to locate seismic events. We compare the travel-time prediction and location capabilities of SALSA3D to standard 1D and 2/2.5D models via location tests on a global event set with GT of 5 km or better. Using Pn and P picks from IMS stations only, we generate different realizations of station distributions, yielding a range of azimuthal coverage and ratios of teleseismic to regional arrivals, with which we test the accuracy and precision of relocation. We test using the full 3D covariance matrix of the current model to calculate path-dependent travel time uncertainty, rather than applying standard, 1D, distance-dependent uncertainty. SALSA3D reduces mislocation over the standard 1D ak135 model regardless of Pn to P ratio, with the most pronounced improvement at higher azimuthal gaps. SALSA3D also reduces mislocation compared to the combined RSTT/ak135 model (2.5D - RSTT for regional phases), with minimal improvement over RSTT when only regional Pn phases are used to compute locations. JF - American Geophysical Union Fall Meeting AU - Begnaud, M L AU - Ballard, S AU - Young, C J AU - Hipp, J R AU - Encarnacao, A AU - Phillips, W AU - Chael, E P AU - Rowe, C A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S21B EP - 2392 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707526129?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Using+the+international+monitoring+system+to+validate+SALSA3D%3B+a+global+3D+P-velocity+model+of+the+crust+and+mantle+for+improved+seismic+event+location&rft.au=Begnaud%2C+M+L%3BBallard%2C+S%3BYoung%2C+C+J%3BHipp%2C+J+R%3BEncarnacao%2C+A%3BPhillips%2C+W%3BChael%2C+E+P%3BRowe%2C+C+A%3BAnonymous&rft.aulast=Begnaud&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - International collaboration to improve the Regional Seismic Travel Time (RSTT) model AN - 1707526105; 2015-080598 AB - The Regional Seismic Travel Time (RSTT) method (Myers et al., 2010) was developed to facilitate the use of regional data in routine seismic monitoring. RSTT improves prediction accuracy for Pn, Pg, Sn, and Lg travel times using a 3-dimensional model of the Earth's crust and laterally varying seismic wave speed in the upper mantle. Upper mantle velocity is parameterization as a linear function of depth, so that travel times can be computed accurately and in real time. Real-time computation on readily available computers is key to the usefulness of the method by seismic centers that utilize today's flexible networks. In areas where the RSTT model is well constrained by tomography (Eurasia and North America) we have demonstrated improvement in event location accuracy. Extension of RSTT tomographic datasets to new regions is being pursued through international outreach efforts that are coordinated between the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) and the International Seismological Centre (ISC). Our efforts to date have expanded the collection of regionally recorded events with well-constrained hypocenters in South America, Australia, and Africa. We have also incorporated recently published models of crust and upper mantle structure into the RSTT model. Tests in regions sampled by newly compiled data suggest that the RSTT model improves travel time predictions with respect to the ak135 model (Kennett et al., 1995), which is the global standard for travel time prediction. We are continuing to collect and freely distribute ground-truth data in new regions as well as updates to the RSTT model. This work performed in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. JF - American Geophysical Union Fall Meeting AU - Myers, S C AU - Begnaud, M L AU - Ballard, S AU - Bondar, I AU - Storchak, D A AU - Given, Jeffrey W AU - Guendel, F AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S21B EP - 2391 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707526105?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=International+collaboration+to+improve+the+Regional+Seismic+Travel+Time+%28RSTT%29+model&rft.au=Myers%2C+S+C%3BBegnaud%2C+M+L%3BBallard%2C+S%3BBondar%2C+I%3BStorchak%2C+D+A%3BGiven%2C+Jeffrey+W%3BGuendel%2C+F%3BAnonymous&rft.aulast=Myers&rft.aufirst=S&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Integrated mapping and imaging at a legacy test site AN - 1707526034; 2015-080733 AB - A team of multi-disciplinary geoscientists was tasked to characterize and evaluate a legacy nuclear detonation site in order to develop research locations with the long-term goal of improving treaty monitoring, verification, and other national security applications. There was a test at the site of interest that was detonated on June 12, 1985 in a vertical emplacement borehole at a depth of 608m below the surface in rhyolites. With announced yield of 20-150 kt, the event did not collapse to the surface and form a crater, but rather experienced a subsurface collapse with more subtle surface expressions of deformation. This result provides the team with an opportunity to evaluate a number of surface and subsurface inspection technologies in a broad context. The team collected ground-based visual observation, ground penetrating radar, electromagnetic, ground-based and airborne LiDAR, ground-based and airborne hyperspectral, gravity and magnetics, dc and induction electrical methods, and active seismic data during field campaigns in the summers of 2012 and 2013. Detection of features was performed using various approaches that were assessed for accuracy, efficiency and diversity of target features. For example, whereas the primary target of the ground-based visual observation survey was to map the surface features, the target of the gravity survey was to attempt the detection of a possible subsurface collapse zone which might be located as little as 200 meters below the surface. The datasets from surveys described above are integrated into a geographical information system (GIS) database for analysis and visualization. Other presentations during this session provide further details as to some of the work conducted. JF - American Geophysical Union Fall Meeting AU - Sussman, A J AU - Schultz-Fellenz, E S AU - Kelley, R E AU - Sweeney, J J AU - Vigil, S AU - DiBenedetto, J AU - Chipman, V AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S31E EP - 03 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707526034?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Integrated+mapping+and+imaging+at+a+legacy+test+site&rft.au=Sussman%2C+A+J%3BSchultz-Fellenz%2C+E+S%3BKelley%2C+R+E%3BSweeney%2C+J+J%3BVigil%2C+S%3BDiBenedetto%2C+J%3BChipman%2C+V%3BAnonymous&rft.aulast=Sussman&rft.aufirst=A&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Post-shot surface damage detected with LIDAR at the source physics experiment site AN - 1707526015; 2015-080734 AB - Designed to improve long-range treaty monitoring capabilities, the Source Physics Experiment series is being conducted at a location in Nevada and provides an opportunity to advance near-field monitoring and field-based investigations of suspected underground test locations. In particular, features associated with underground testing can be evaluated using Source Physics Experiment activities as analogs, linking on-site inspections with remote sensing technologies. Following a calibration shot (SPE 1), SPE 2 (10/2011) and SPE 3 (07/2012) were performed in the same emplacement hole with 1.0 ton of explosives at 150 ft depth. A fourth shot (SPE 4) is planned for August 2013 as a 220 lb (100 kg) TNT equivalent shot at a depth of 315 ft (96 m). Because one of the goals of the Source Physics Experiments is to determine damage effects on seismic wave propagation and improve modeling capabilities, a key component in the predictive component and ultimate validation of the models is a full understanding of the intervening geology between the source and instrumented bore holes. Ground-based LIDAR and fracture mapping, mechanical properties determined via laboratory testing of rock core, discontinuity analysis and optical microscopy of the core rocks were performed prior to and following each experiment. Results of the LIDAR collects from both SPE 2 and 3 indicate a permanent ground displacement of up to several centimeters aligning along the projected surface traces of two faults observed in the core and fractures mapped at the surface. Work by Los Alamos National Laboratory was sponsored by the National Nuclear Security Administration Award No. DE-AC52-06NA25946. JF - American Geophysical Union Fall Meeting AU - Schultz-Fellenz, E S AU - Sussman, A J AU - Kelley, R E AU - Cooper, D I AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S31E EP - 04 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707526015?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Post-shot+surface+damage+detected+with+LIDAR+at+the+source+physics+experiment+site&rft.au=Schultz-Fellenz%2C+E+S%3BSussman%2C+A+J%3BKelley%2C+R+E%3BCooper%2C+D+I%3BAnonymous&rft.aulast=Schultz-Fellenz&rft.aufirst=E&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - A global model for regional phase amplitude prediction AN - 1707525745; 2015-080597 AB - We use two-dimensional (2-D) models of regional phase attenuation, and absolute site effects, to predict amplitudes for use in high frequency discrimination and yield estimation schemes. We have shown that 2-D corrections reduce scatter in P/S ratios, thus improve discrimination power. This is especially important for intermediate frequencies (2-6 Hz), which travel further than the higher frequencies that are typically used for discrimination. Previous work has focused on national priorities; however, for use by the international community, attenuation and site models must cover as much of the globe as possible. New amplitude quality control (QC) methods facilitate this effort. The most important step is to cluster events spatially, take ratios to remove path and site effects, and require the relative amplitudes to match predictions from an earthquake source model with variable moment and corner frequency. Data can then be stacked to form summary amplitudes for each cluster. We perform similar QC and stacking operations for multiple channels at each station, and for closely spaced stations. Data are inverted using a simultaneous multi-band, multi-phase approach that employs absolute spectral constraints on well-studied earthquakes. Global parameterization is obtained using publically available GeoTess software that allows for variable grid spacing. Attenuation results show remarkable, high-resolution correlation with regional geology and heat flow. Our data set includes regional explosion amplitudes from many sources, including LLNL and Leo Brady data for North America, and Borovoye Archive and ChISS data for Asia. We see dramatic improvement in high frequency P/S discrimination, world wide, after correcting for 2-D path and site effects. JF - American Geophysical Union Fall Meeting AU - Phillips, W S AU - Fisk, M D AU - Stead, R J AU - Begnaud, M L AU - Yang, X AU - Ballard, S AU - Rautian, T G AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S21B EP - 2390 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707525745?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+global+model+for+regional+phase+amplitude+prediction&rft.au=Phillips%2C+W+S%3BFisk%2C+M+D%3BStead%2C+R+J%3BBegnaud%2C+M+L%3BYang%2C+X%3BBallard%2C+S%3BRautian%2C+T+G%3BAnonymous&rft.aulast=Phillips&rft.aufirst=W&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Using cross correlation and subspace detection methods to identify earthquakes recorded by the Cascadia Initiative seismic dataset AN - 1707525722; 2015-080629 AB - Present-day Cascadia Subduction Zone seismic activity includes episodes of non-volcanic tremor (NVT) concentrated in the downdip area of the seismogenic zone, but very few megathrust earthquakes are observed. These few earthquakes, distinct from NVT along the plate interface, tend to be clusters of repeated events, which provide information about fault zone heterogeneity and may indicate locations with frictional conditions favorable for seismic slip. Current understanding of the spatial extent of NVT and repeating earthquakes may be biased, however, due to the limitations of using land stations to detect and locate these lower magnitude events. To assess whether this bias affects the seismicity catalogs for this region, we use data from the first year of the NSF-funded Cascadia Initiative to search for additional earthquakes using coastal land stations and ocean bottom seismometers (OBS) to provide better coverage of the updip portion of the subducting slab. The year 1 deployment of 62 OBS stations and 27 coastal land stations covered the northern half of Cascadia during July 25, 2011 - July 22, 2012. We test whether repeating earthquakes are common within the first deployment year by using waveform cross correlation techniques. We compare continuous seismic data from 8 coastal and near-shore OBS stations with shallow subduction zone template earthquakes selected from events in the USGS, Pacific Northwest Seismic Network, and Array Network Facility (ANF) catalogs. In addition, we use several templates to define a subspace of possible matches and scan the waveforms for events that can be described with the subspace. Preliminary results suggest that additional, non-cataloged events did occur during the first year of deployment in an area of the southern end of the deployment. Earthquake catalogs show this area as an active region of seismicity that may correspond to a subducting seamount. Waveforms from these events are very similar to defined templates. We will provide catalogs of correlation-detected events and show preliminary locations relative to the existing cataloged events. JF - American Geophysical Union Fall Meeting AU - Eimer, M O AU - Bilek, S L AU - Rowe, C A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S21C EP - 2422 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707525722?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Using+cross+correlation+and+subspace+detection+methods+to+identify+earthquakes+recorded+by+the+Cascadia+Initiative+seismic+dataset&rft.au=Eimer%2C+M+O%3BBilek%2C+S+L%3BRowe%2C+C+A%3BAnonymous&rft.aulast=Eimer&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Joint inversion of body-wave arrival times and surface-wave dispersion data for three-dimensional seismic velocity structure around SAFOD AN - 1707525704; 2015-080665 AB - The crust around the San Andreas Fault Observatory at depth (SAFOD) has been the subject of many geophysical studies aimed at characterizing in detail the fault zone structure and elucidating the lithologies and physical properties of the surrounding rocks. Seismic methods in particular have revealed the complex two-dimensional (2D) and three-dimensional (3D) structure of the crustal volume around SAFOD and the strong velocity reduction in the fault damage zone. In this study we conduct a joint inversion using body-wave arrival times and surface-wave dispersion data to image the P-and S-wave velocity structure of the upper crust surrounding SAFOD. The two data types have complementary strengths - the body-wave data have good resolution at depth, albeit only where there are crossing rays between sources and receivers, whereas the surface waves have very good near-surface resolution and are not dependent on the earthquake source distribution because they are derived from ambient noise. The body-wave data are from local earthquakes and explosions, comprising the dataset analyzed by Zhang et al. (2009). The surface-wave data are for Love waves from ambient noise correlations, and are from Roux et al. (2011). The joint inversion code is based on the regional-scale version of the double-difference (DD) tomography algorithm tomoDD. The surface-wave inversion code that is integrated into the joint inversion algorithm is from Maceira and Ammon (2009). The propagator matrix solver in the algorithm DISPER80 (Saito, 1988) is used for the forward calculation of dispersion curves from layered velocity models. We examined how the structural models vary as we vary the relative weighting of the fit to the two data sets and in comparison to the previous separate inversion results. The joint inversion with the "optimal" weighting shows more clearly the U-shaped local structure from the Buzzard Canyon Fault on the west side of SAF to the Gold Hill Fault on the east side. JF - American Geophysical Union Fall Meeting AU - Zhang, H AU - Thurber, C H AU - Maceira, M AU - Roux, P AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S21E EP - 02 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707525704?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Joint+inversion+of+body-wave+arrival+times+and+surface-wave+dispersion+data+for+three-dimensional+seismic+velocity+structure+around+SAFOD&rft.au=Zhang%2C+H%3BThurber%2C+C+H%3BMaceira%2C+M%3BRoux%2C+P%3BAnonymous&rft.aulast=Zhang&rft.aufirst=H&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - Global trends in ocean wave state and extremal storm events examined with microseism analysis AN - 1707524884; 2015-080701 AB - The Earth's seismic noise spectrum features two globally ubiquitous peaks near 8 and 16 s periods that arise when storm-generated ocean gravity waves are converted to seismic energy, predominantly as Rayleigh waves. Because of its regionally integrative nature, microseism intensity histories at long running sites can provide useful proxies for wave state. Expanding on an earlier study of global microseism trends (Aster et al., 2010), we analyze up-to-date multi-decadal seismic data from global stations associated with several seismographic networks to characterize the spatiotemporal evolution of wave climate over the past >20 years. Ground motion power spectral density (PSD) is calculated over 3-hour overlapping time series segments to produce a database of PSD statistics at each broadband station between 2 and 100 s. Isolating power in the primary and secondary microseism bands enables regional characterization of spatially-integrated trends in wave states. In addition, specific extremal storm events are detected and are used to assess decadal changes in the location and frequency of oceanic storm activity. The results of these analyses are then interpreted in concert with recognized modes of atmospheric variability (e.g., El Nino-Southern Oscillation, Southern Annular Mode), that can impact storm statistics. We note a number of statistically significant increasing trends in both raw microseism power and storm activity occurring at multiple stations in the Northwest Atlantic and Southeast Pacific suggestive of increased wave heights and storminess in these regions. Additionally, we observe especially strong increases in microseism activity off of the Antarctic Peninsula, with monthly fluctuations strongly correlated to local anomalies in seasonal sea ice concentration. In turn, these reductions in sea ice concentration and extent appear to correlate with recent strengthening of the Southern Annular Mode. Such trends in wave activity have the potential to significantly influence coastal environments and cryospheric stability, particularly under rising global sea levels. JF - American Geophysical Union Fall Meeting AU - Anthony, R E AU - Aster, R C AU - Rowe, C A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S31B EP - 2350 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707524884?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Global+trends+in+ocean+wave+state+and+extremal+storm+events+examined+with+microseism+analysis&rft.au=Anthony%2C+R+E%3BAster%2C+R+C%3BRowe%2C+C+A%3BAnonymous&rft.aulast=Anthony&rft.aufirst=R&rft.date=2013-12-01&rft.volume=332&rft.issue=6028&rft.spage=443&rft.isbn=&rft.btitle=&rft.title=Science+%28Washington%29&rft.issn=00368075&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 ER - TY - JOUR T1 - On the generation and refraction of the microbarom signal by hurricanes over the Atlantic Ocean AN - 1703690173; 2015-078333 AB - It is well known that both seismic and acoustic noise spectra show an increased band of spatially coherent noise around 0.2 Hz, the so-called microbarom and microseism signals. It has been appreciated for at least a half of a century that hurricanes over the open ocean are a source of microbaroms and microseisms. While the mechanism for microseism generation has been understood since the early 1960's, a complete theory of the generation of microbaroms did not appear until 2006. It has been shown that microbaroms and microseisms are two manifestations of the same phenomenon: a radiating harmonic of the ocean surface wave field produced by the head-on collision of ocean surface waves of the same period. In 2008 it was conjectured that, for a deep ocean hurricane, the source of the colliding waves is the interaction of the hurricane generated waves with the background ocean swell. The region in which this interaction takes place is generally several hundred kilometers from the eye of the storm, and is more or less static with respect to the storm. As the microbarom signal propagates away from the source region propagation paths that pass through the storm are strongly refracted. Thus, hurricanes at sea carry a sound source with them which might be used to probe the storm itself. To study this effect, a temporary network of infrasound stations was deployed along the US eastern seaboard during the 2010 and 2011 hurricane seasons. The underlying theory will be presented and results from the deployments will be shown. JF - American Geophysical Union Fall Meeting AU - Waxler, R AU - Blom, Phil AU - Talmadge, C L AU - Frazier, W AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S14A EP - 03 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1703690173?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=On+the+generation+and+refraction+of+the+microbarom+signal+by+hurricanes+over+the+Atlantic+Ocean&rft.au=Waxler%2C+R%3BBlom%2C+Phil%3BTalmadge%2C+C+L%3BFrazier%2C+W%3BAnonymous&rft.aulast=Waxler&rft.aufirst=R&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - ChemCam passive reflectance spectroscopy at Gale crater, Mars AN - 1700099283; 2015-070586 AB - The Laser-Induced Breakdown Spectrometer (LIBS) portion of the ChemCam instrument on the Mars Science Laboratory Curiosity rover uses 3 dispersive spectrometers to cover the ultraviolet (240-342 nm), visible (382-469 nm) and visible/near-infrared (474-906 nm) spectral regions at high spectral ( 600 nm are typical of lower-reflectance, less dusty rock surfaces, whereas positive slopes < 600 nm are consistent with higher-reflectance, dustier surfaces. ChemCam elemental detections of Ca- and S-bearing veins correlate to high reflectance targets with some dust contamination. Spectra of the John (sub K) lein and Cumberland drill tailings, as well as brushed and broken rock surfaces in the Yellowknife Bay area, exhibit much less "red" spectral features, including inflections near 550 nm that are consistent with a number of ferrous and ferric iron-bearing clay mineral phases, similar to CheMin results. Ongoing work with ChemCam passive spectra will include efforts to utilize the UV spectral range (sensitive to iron content), investigate photometric effects of illumination variations on the calibration targets, and dust mitigation efforts. As Curiosity traverses toward Mt. Sharp, passive spectra will be used as an additional tool to remotely track variations in surface chemistry and mineralogy, particularly for iron-bearing sulfate, oxide, and clay minerals. JF - American Geophysical Union Fall Meeting AU - Johnson, Jeffrey R AU - Bell, Jim F AU - Cloutis, E AU - Bender, S AU - Blaney, Diana L AU - Ehlmann, B L AU - Gasnault, Olivier AU - Kinch, K M AU - Le Mouelic, Stephane AU - Rice, M S AU - Wiens, R C AU - DeFlores, Lauren P AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract P23C EP - 1796 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700099283?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=ChemCam+passive+reflectance+spectroscopy+at+Gale+crater%2C+Mars&rft.au=Johnson%2C+Jeffrey+R%3BBell%2C+Jim+F%3BCloutis%2C+E%3BBender%2C+S%3BBlaney%2C+Diana+L%3BEhlmann%2C+B+L%3BGasnault%2C+Olivier%3BKinch%2C+K+M%3BLe+Mouelic%2C+Stephane%3BRice%2C+M+S%3BWiens%2C+R+C%3BDeFlores%2C+Lauren+P%3BAnonymous&rft.aulast=Johnson&rft.aufirst=Jeffrey&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Calcium sulfate vein observations at Yellowknife Bay using ChemCam on the Curiosity Rover AN - 1700099077; 2015-070587 AB - The Mars Science Laboratory Curiosity rover completed its traverse from the Bradbury landing site into Yellowknife Bay (YKB) on sol 125, where it spent approximately 175 sols. The YKB region is characterized as a fluvio-lacustrine depositional environment. The entire Curiosity payload was used to thoroughly investigate parts of YKB from which significant geochemical observations were made, including the identification of anhydrite and hydrated calcium sulfate. The Curiosity ChemCam package consists of a remote Laser-Induced Breakdown Spectrometer (LIBS) and a Remote Micro-Imager (RMI). LIBS is essentially an elemental analysis micro-probe capable of 300 - 550 mu m spatial resolution from 1.5 - 7.0 m standoff distance from the Curiosity mast. The RMI records context images that have a resolution of 40 mu rad, which corresponds to 120 mu m at 3 meters. The ChemCam instrument recorded many calcium rich geochemical features as it descended approximately 18 m into YKB. Many light-toned veins became apparent with the ChemCam RMI and Mastcam once Curiosity entered YKB. The ChemCam LIBS instrument is uniquely capable of distinctly probing the elemental composition of these vein structures separately from the host rock. LIBS demonstrated that the white vein material was dominated by CaSO4, while the host rock had relatively low SO3 compositions. The ChemCam instrument can also qualitatively detect H, presumably due to H2O, in many samples. While some of these veins contained no H signature beyond the ubiquitous small amount of H on rock surfaces and in soils, some of the veins contained various amounts of H as a function of depth indicating that some of the samples were either bassanite or gypsum. Mastcam spectral hydration surveys detect evidence of hydration that is consistent with (but not a unique indicator of) the presence of gypsum in some, but not all, of the veins. The CheMin X-ray diffraction instrument identified both anhydrite and bassanite in the matrix of a mudstone unit but did not detect gypsum. Stoichiometric analysis of the ChemCam data currently suggests that the hydrated vein samples analyzed by LIBS are bassanite. This paper will summarize the vein observations and describe some of the more likely formation mechanisms. JF - American Geophysical Union Fall Meeting AU - Clegg, S M AU - Mangold, Nicolas AU - Nachon, Marion AU - Le Mouelic, Stephane AU - Ollila, A AU - Vaniman, D T AU - Kah, L C AU - Dromart, Gilles AU - Bridges, J AU - Rice, M S AU - Wellington, Danika F AU - Bell, Jim F AU - Anderson, R B AU - Clark, Ben C AU - Cousin, A AU - Forni, Olivier AU - Lasue, Jeremie AU - Schroeder, S AU - Meslin, P AU - Dyar, M D AU - Blaney, Diana L AU - Maurice, Sylvestre AU - Wiens, R C AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract P23C EP - 1797 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700099077?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Calcium+sulfate+vein+observations+at+Yellowknife+Bay+using+ChemCam+on+the+Curiosity+Rover&rft.au=Clegg%2C+S+M%3BMangold%2C+Nicolas%3BNachon%2C+Marion%3BLe+Mouelic%2C+Stephane%3BOllila%2C+A%3BVaniman%2C+D+T%3BKah%2C+L+C%3BDromart%2C+Gilles%3BBridges%2C+J%3BRice%2C+M+S%3BWellington%2C+Danika+F%3BBell%2C+Jim+F%3BAnderson%2C+R+B%3BClark%2C+Ben+C%3BCousin%2C+A%3BForni%2C+Olivier%3BLasue%2C+Jeremie%3BSchroeder%2C+S%3BMeslin%2C+P%3BDyar%2C+M+D%3BBlaney%2C+Diana+L%3BMaurice%2C+Sylvestre%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Clegg&rft.aufirst=S&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Compositions of sub-millimeter-size clasts seen by ChemCam in Martian soils at Gale; a window into the production processes of soils AN - 1700098932; 2015-070588 AB - Curiosity landed the August 6, 2012 in Gale Crater, Mars. With its 80 kg payload, this rover possesses unique analytical capabilities to investigate the chemistry and mineralogy of the Martian soil. In particular, the ChemCam laser-induced breakdown spectroscopy (LIBS) instrument allows shallow (mm to cm) soil depth profile analysis, thanks to shot-to-shot spectra acquisition (usually 30 laser shots are performed, but many more can be done). This instrument gives for the first time a good opportunity to carry out large numbers of analyses on soil chemistry and its homogeneity at fine spatial scales (from 360 to 550 mu m [Maurice et al, 2012]). This study is focused on the geochemical diversity observed between different soil separates, in particular between fine sand and coarse sand particles, whose mobility and geographical origin are likely to be different. Previous missions have shown that the soils have a uniform composition planet-wide [Yen et al., 2005]. Analyses performed by the APXS and by ChemCam in an aeolian sand shadow and in its vicinity extend this result to the fine-grained soils encountered in Gale Crater [Blake et al., 2013; Meslin et al., 2013]. However, ChemCam has sampled more than 170 soils during the first 250 sols, and has revealed the presence of three kinds of soils in Gale: i) mm-sized grains of felsic composition, usually encountered in the hummocky unit, ii) mafic, fine-grained soils found at Rocknest and throughout the rover traverse, and iii) soils with an intermediate composition, possibly as a result of mechanical mixing between the two former categories, or possibly chemically distinct [Meslin et al, 2013]. To follow up with this analysis, the composition of coarse sand grains was investigated using the spectra acquired shot by shot. Independent Component Analysis (ICA) [Forni et al., 2013] shows that there are two principal groups of clasts. Spectral analysis confirms that a first group is enriched in Na, Si, Ca and Al, whereas the second group is enriched in Mg and H, and is poor in Na, Al, Si and Ca. An intermediate group displays more Fe, Ti, Ca, Na, K contribution, and no H. The ICA observations agree with the compositions determined from the spectra, and reflect those made by Meslin et al. [2013] in the soils. Detected grains show a typical basaltic mixing between felsic and mafic minerals. The intermediate group is interesting as it is not solely a mixture of fines and felsic grains, but its origin is still under investigation. The fines have a basaltic composition, but also contain an amorphous or poorly crystalline phase, consistent with CheMin/APXS analyses of Rocknest soil [Blake et al., 2013]. Maurice et al. (2012), LPSC 43rd #2899 Blake et al. (2013), Science, in press Meslin et al. (2013), Science, in press Forni et al. (2013), Spectrochimica Acta Part B, 86, 13-41. Yen et al. (2005), Nature, 436, 49-54. JF - American Geophysical Union Fall Meeting AU - Cousin, A AU - Meslin, P AU - Forni, Olivier AU - Rapin, William AU - Tokar, R L AU - Fabre, Cecile AU - Wiens, R C AU - Gasnault, Olivier AU - Ollila, A AU - Maurice, Sylvestre AU - Lasue, Jeremie AU - Sautter, V AU - Clegg, S M AU - Le Mouelic, Stephane AU - Dromart, Gilles AU - Mangold, Nicolas AU - Berger, Gilles AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract P23C EP - 1798 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700098932?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Compositions+of+sub-millimeter-size+clasts+seen+by+ChemCam+in+Martian+soils+at+Gale%3B+a+window+into+the+production+processes+of+soils&rft.au=Cousin%2C+A%3BMeslin%2C+P%3BForni%2C+Olivier%3BRapin%2C+William%3BTokar%2C+R+L%3BFabre%2C+Cecile%3BWiens%2C+R+C%3BGasnault%2C+Olivier%3BOllila%2C+A%3BMaurice%2C+Sylvestre%3BLasue%2C+Jeremie%3BSautter%2C+V%3BClegg%2C+S+M%3BLe+Mouelic%2C+Stephane%3BDromart%2C+Gilles%3BMangold%2C+Nicolas%3BBerger%2C+Gilles%3BAnonymous&rft.aulast=Cousin&rft.aufirst=A&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - The ChemCam remote micro-imager on MSL; observations from the first year on Mars AN - 1700098839; 2015-070580 AB - The Remote Microscopic Imager (RMI) portion of the ChemCam instrument on the Mars Science Laboratory "Curiosity" rover acquires panchromatic images with a 1024X1024 pixel CCD. The main objective of the RMI is to provide geomorphologic context of the ChemCam Laser Induced Breakdown Spectroscopy (LIBS) analyses, locate the laser pits, and document the changes induced by the laser shots on the targets. Thanks to its very narrow pixel angular size of 20 microrad, RMI by itself adds a significant scientific value to the study of soils and rocks by revealing their fine texture and morphology, and can also occasionally serve as a reconnaissance tool for distant targets as the rover drives along. During the first year of operations on Mars, the RMI has been used in a variety of situations, providing more than 1000 images of rover hardware, soils and rock targets located at distances ranging from 1.2 meters up to several kilometers from the camera. Several types of products have been derived from these raw data. These include mosaics of images taken before and after the LIBS shots, difference images to identify the most subtle laser pits on hard rocks, merges with the color information acquired by the Mastcam cameras, and micro-topographic information from focal sections, also known as the z-stack technique. Further applications are also under investigation, such as night sky imaging or stereogrammetry using RMI and Mastcam 100 images. The RMI has the highest spatial resolution of the cameras on MSL's remote sensing mast, and is therefore very useful, along with Curiosity's other imaging instruments, in deciphering the history of rocks and soils at Gale crater. JF - American Geophysical Union Fall Meeting AU - Le Mouelic, Stephane AU - Gasnault, Olivier AU - Bridges, Nathan T AU - Herkenhoff, K E AU - Langevin, Yves AU - Pinet, Patrick C AU - Maurice, Sylvestre AU - Wiens, R C AU - Mangold, Nicolas AU - Johnson, Jeffrey R AU - Bell, Jim F AU - Blaney, Diana L AU - Barraclough, B L AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract P23C EP - 1790 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700098839?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+ChemCam+remote+micro-imager+on+MSL%3B+observations+from+the+first+year+on+Mars&rft.au=Le+Mouelic%2C+Stephane%3BGasnault%2C+Olivier%3BBridges%2C+Nathan+T%3BHerkenhoff%2C+K+E%3BLangevin%2C+Yves%3BPinet%2C+Patrick+C%3BMaurice%2C+Sylvestre%3BWiens%2C+R+C%3BMangold%2C+Nicolas%3BJohnson%2C+Jeffrey+R%3BBell%2C+Jim+F%3BBlaney%2C+Diana+L%3BBarraclough%2C+B+L%3BAnonymous&rft.aulast=Le+Mouelic&rft.aufirst=Stephane&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - AEGIS automated targeting for the MSL ChemCam instrument AN - 1700097731; 2015-072536 AB - The Autonomous Exploration for Gathering Increased Science (AEGIS) system enables automated science data collection by a planetary rover. AEGIS has been in use on the Mars Exploration Rover (MER) mission Opportunity rover since 2010 to provide onboard targeting of the MER Panoramic Camera based on scientist-specified objectives. AEGIS is now being applied for use with the Mars Science Laboratory (MSL) mission ChemCam spectrometer. ChemCam uses a Laser Induced Breakdown Spectrometer (LIBS) to analyze the elemental composition of rocks and soil from up to seven meters away. ChemCam's tightly-focused laser beam (350-550 um) enables targeting of very fine-scale terrain features. AEGIS is being applied in two ways to help ChemCam collect valuable science data. The first application is to enable automated targeting of ChemCam during or after or in the middle of long drives. The majority of ChemCam measurements are collected by allowing the science team to select specific targets in rover images. However this requires the rover to stay in the same area while images are downlinked, analyzed for targets, and new commands uplinked. The only data that can be acquired without this communication cycle is via blind targeting, where measurements are often of soil patches vs. instead of more valuable targets such as rocks with specific properties. AEGIS is being applied to automatically analyze images onboard and select targets for ChemCam analysis. This approach allows the rover to autonomously select and sequence targeted measurements in an opportunistic fashion at different points along the rover's drive path. Rock targets can be prioritized for measurement based on various geologically relevant features, including size, shape and albedo. A second application is to enable intelligent pointing refinement of ChemCam when acquiring data of small targets, such as veins or concretions that are only a few millimeters wide. Due to backlash and other pointing challenges, it can often require several downlink cycles for LIBS measurements to be acquired on small targets. Often targets must first be imaged using the high resolution ChemCam Remote Micro Imager (RMI) and then ground analysis performed to enable a fine-tuned pointing correction on the next commanding cycle. AEGIS is being applied to analyze RMI images onboard and automatically determine the pointing refinement necessary to acquire LIBS data on small targets. This significantly decreases the amount of time and resources required to acquire ChemCam data on such targets. Work is currently in progress to adapt AEGIS algorithm for these applications and integrate the system with MSL flight software. Once integration and testing is complete, AEGIS will be uploaded to the spacecraft for operational use. JF - American Geophysical Union Fall Meeting AU - Estlin, Tara AU - Anderson, Robert C AU - Blaney, Diana L AU - Bornstein, Benjamin AU - Burl, Michael C AU - Castano, Rebecca AU - Gaines, Daniel M AU - Judd, M AU - Thompson, David Ray AU - Wiens, R C AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract P51G EP - 1801 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700097731?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=AEGIS+automated+targeting+for+the+MSL+ChemCam+instrument&rft.au=Estlin%2C+Tara%3BAnderson%2C+Robert+C%3BBlaney%2C+Diana+L%3BBornstein%2C+Benjamin%3BBurl%2C+Michael+C%3BCastano%2C+Rebecca%3BGaines%2C+Daniel+M%3BJudd%2C+M%3BThompson%2C+David+Ray%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Estlin&rft.aufirst=Tara&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Diversity of rock compositions at Gale Crater observed by ChemCam and APXS on Curiosity, and comparison to meteorite and orbital observations AN - 1700097712; 2015-072357 AB - Gale crater was selected as the Curiosity landing site because of the apparent sedimentary spectral signatures seen from orbit. Sedimentary materials on Mars have to this point showed very little expression of major element mobility, so compositions of precursor igneous minerals play a strong role in the compositions of sediments. In addition, pebbles and float rocks on Bradbury Rise (sols 0-50, > 324) appear to be mostly igneous in origin, and are assumed to have been carried down from the crater rim. Overall in the first year on Mars ChemCam obtained >75,000 LIBS spectra on > 2,000 observation points, supported by > 1,000 RMI images, and APXS obtained a significant number of observations. These show surprisingly variable compositions. The mean ChemCam compositions for Bradbury Rise dust-free rocks and pebbles (62 locations) give SiO2 = 56%, FeOT = 16% and show high alkalis consistent with Jake Matijevic (sol approximately 47) APXS Na2O approximately 6.6 wt%. ChemCam observations on the conglomerate Link (sol 27) gave Rb > 150 ppm and Sr > 1500 ppm. These compositions imply the presence of abundant alkali feldspars in the material infilling the lower parts of Gale crater. They are generally consistent with the more feldspar-rich SNC meteorites but show a radical departure from larger scale orbital observations, e.g., GRS, raising the question of how widespread these compositions are outside of Gale crater. Sedimentary materials at Yellowknife Bay encompassing the Sheepbed (sols 125-300) and Shaler (sols 121, 311-324) units, potentially including Point Lake (sols 301-310) and Rocknest (sols 57-97), appear to have incorporated varying amounts of igneous source materials. Seven rocks investigated at Rocknest show significant additions of Fe, with mean FeOT = 25% (154 locations), suggesting that FeO was a cementing agent. ChemCam observations at Shaler show varying amounts of alkali feldspar (i.e., related to Bradbury Rise), Fe-rich material (Rocknest-like), and potassium-rich material (related potentially to Bathurst, apparent bedrock observed sols 54-55, located stratigraphically between Bradbury and Rocknest). ChemCam observations in Yellowknife Bay formation rocks identified calcium-sulfate veins with varying amounts of hydration, as suggested by Mastcam multispectral observations. ChemCam also discovered Mg-rich raised ridges as a diagenetic feature occurring in the upper part of the Sheepbed member. JF - American Geophysical Union Fall Meeting AU - Wiens, R C AU - Maurice, Sylvestre AU - Grotzinger, J P AU - Gellert, R AU - Mangold, Nicolas AU - Sautter, V AU - Ollila, A AU - Dyar, M D AU - Le Mouelic, Stephane AU - Ehlmann, B L AU - Clegg, S M AU - Lanza, Nina L AU - Cousin, A AU - Forni, Olivier AU - Gasnault, Olivier AU - Lasue, Jeremie AU - Blaney, Diana L AU - Newsom, H E AU - Herkenhoff, K E AU - Anderson, R B AU - d'Uston, Lionel AU - Bridges, Nathan T AU - Fabre, Cecile AU - Meslin, P Y AU - Johnson, Jeff AU - Vaniman, D AU - Bridges, J AU - Dromart, Gilles AU - Schmidt, M E AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract P21D EP - 05 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700097712?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Diversity+of+rock+compositions+at+Gale+Crater+observed+by+ChemCam+and+APXS+on+Curiosity%2C+and+comparison+to+meteorite+and+orbital+observations&rft.au=Wiens%2C+R+C%3BMaurice%2C+Sylvestre%3BGrotzinger%2C+J+P%3BGellert%2C+R%3BMangold%2C+Nicolas%3BSautter%2C+V%3BOllila%2C+A%3BDyar%2C+M+D%3BLe+Mouelic%2C+Stephane%3BEhlmann%2C+B+L%3BClegg%2C+S+M%3BLanza%2C+Nina+L%3BCousin%2C+A%3BForni%2C+Olivier%3BGasnault%2C+Olivier%3BLasue%2C+Jeremie%3BBlaney%2C+Diana+L%3BNewsom%2C+H+E%3BHerkenhoff%2C+K+E%3BAnderson%2C+R+B%3Bd%27Uston%2C+Lionel%3BBridges%2C+Nathan+T%3BFabre%2C+Cecile%3BMeslin%2C+P+Y%3BJohnson%2C+Jeff%3BVaniman%2C+D%3BBridges%2C+J%3BDromart%2C+Gilles%3BSchmidt%2C+M+E%3BAnonymous&rft.aulast=Wiens&rft.aufirst=R&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - ChemCam compositional results from the Shaler outcrop in Gale Crater, Mars AN - 1700095925; 2015-072358 AB - The Curiosity rover first visited the outcrop known as "Shaler" on Sol 121 of the mission. The approximately 1 m thick outcrop is the "type section" for the Shaler member, which forms the uppermost part of the Yellowknife Bay formation. The Shaler outcrop exhibits multiple well-exposed cross-bedded facies with typical grain sizes of 1-2 mm, most consistent with fluvial deposition. Initial results from the two Sol 121 observations of Shaler by the ChemCam instrument showed similar composition, with a mix of mafic silicates and feldspar grains. A strong correlation between iron and titanium indicates the possible presence of titanomagnetite or ilmenite. CaO shows an anticorrelation with the total of the measured major elements, suggesting that it may be related to a non-silicate phase such as a salt. The rover returned to the outcrop on Sols 309-324. Because of the rugged nature of the outcrop, much of the exposed rock was not reachable by the rover's robotic arm. However, the ChemCam instrument can collect elemental compositional information out to a range of approximately 7 m using laser-induced breakdown spectroscopy (LIBS), and can acquire high-resolution images at even greater range. ChemCam analyzed 29 locations using LIBS to determine chemical composition, and four additional locations were imaged with the Remote Micro Imager. The targets analyzed included both fine- and coarse-grained facies, as well as a distinct upper unit which appears darker and less red than other Shaler units in Mastcam images, and lacks the striking alternating resistant and recessive cross-bedding observed in lower Shaler. This upper unit occurs at an elevation similar to the rocks at "Rocknest", and similar-looking rocks appear across the cratered surface to the south and east of Shaler. Several blocks apparently derived from this upper unit were analyzed by ChemCam to test the hypothesis that the unit is related to rocks observed at Rocknest. Work is ongoing to interpret the results of the ChemCam campaign at Shaler. This work includes localization of individual laser analysis points to relate fine-scaled texture and grain size to chemical compositions, analysis of detectable minor and trace elements, identification of compositional trends related to facies type, comparison with compositions of other stratigraphic units in Gale crater, and chemical classification based on terrestrial sedimentary geochemistry. JF - American Geophysical Union Fall Meeting AU - Anderson, R B AU - Leveille, Richard J AU - Vaniman, D AU - Williams, Josh AU - Clegg, S M AU - Le Mouelic, Stephane AU - Wiens, R C AU - Edgar, L A AU - Newsom, H E AU - Clark, Ben C AU - Ollila, A AU - Lewis, K W AU - Gupta, S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract P21D EP - 06 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700095925?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=ChemCam+compositional+results+from+the+Shaler+outcrop+in+Gale+Crater%2C+Mars&rft.au=Anderson%2C+R+B%3BLeveille%2C+Richard+J%3BVaniman%2C+D%3BWilliams%2C+Josh%3BClegg%2C+S+M%3BLe+Mouelic%2C+Stephane%3BWiens%2C+R+C%3BEdgar%2C+L+A%3BNewsom%2C+H+E%3BClark%2C+Ben+C%3BOllila%2C+A%3BLewis%2C+K+W%3BGupta%2C+S%3BAnonymous&rft.aulast=Anderson&rft.aufirst=R&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Understanding chemical trends in rock surface compositions as measured by ChemCam at Gale Crater, Mars; the signatures of rock coatings and rinds in LIBS laboratory data AN - 1700095714; 2015-072356 AB - On Earth, the physical and chemical breakdown of rocky materials occurs through interactions with the atmosphere, soil, biological processes, and aqueous solutions. These interactions produce alteration features on the surfaces of rocks, which record information about the amount and types of fluids with which the rock has interacted. Alteration features can also be indicators of and habitats for microbial life in terrestrial environments. Thus, detecting rock surface alteration is an important part of the NASA Curiosity rover mission to Gale crater, Mars. The ChemCam LIBS instrument onboard Curiosity is uniquely suited to detecting and analyzing rock surface alteration. The LIBS technique uses a pulsed laser microbeam (350-550 mu m) to ablate small amounts of material from a target to form a plasma. Because some material is removed during each laser pulse, it is possible to obtain a depth profile of chemical composition by performing multiple laser pulses on one location. Each pulse returns a spectrum that represents the composition at a specific depth, with each subsequent shot sampling the composition at a slightly greater depth. Laboratory measurements of basalts have shown that each LIBS shot removes at least approximately 0.3-0.82 mu m/shot, suggesting a removal of approximately 9-25 mu m of the surface for a standard analysis of 30 shots in rocks of similar hardness. Here we present laboratory LIBS experiments on well-characterized terrestrial rock samples with coatings and rinds with the goal of understanding the signatures of such features in LIBS data from Mars. The terrestrial sample set includes a basalt with a approximately 0-50 mu m thick Mn-rich rock varnish and a thin (<1 mm) weathering rind and a sandy dolomite with a approximately 500 mu m thick Ca-rich rind. Both samples were interrogated with hundreds of LIBS shots per location three times on the unweathered interior and three times on the exterior. Results from the basalt show that compositions similar to the bulk rock composition was reached by approximately 50-70 shots, with the observed chemical changes suggesting both the varnish and at least some rind were penetrated. Results from the sandy dolomite do not show as clear a change from rock exterior to interior as the basalt, but a general chemical trend from exterior to interior was observed in all three depth profiles. Laboratory results suggest that depth profiles of at least 100 shots are useful for clearly identifying coatings and rinds of similar thickness to those found on Earth. However, alteration trends may still be discernible with fewer shots. On Mars, the rock Bathurst Inlet (sol 55), which was shot only 30 times per location, shows what appears to be a near-surface gradient of several elements, most notably Li. Trends similar in nature (if not composition) to the terrestrial sandy dolomite sample were also observed on raised ridge materials such as McGrath (sub 5) (sol 234). Additional martian samples also show trends similar to coatings and rinds measured in the laboratory, suggesting that there may be surface alteration of some rocks in Gale crater. JF - American Geophysical Union Fall Meeting AU - Lanza, Nina L AU - Clegg, S M AU - Wiens, R C AU - Leveille, Richard J AU - Melikechi, N AU - Ollila, A AU - Tokar, R L AU - Newsom, H E AU - Blank, J G AU - Bridges, Nathan T AU - Clark, B AU - Deans, Matthew C AU - Delapp, D AU - Ehlmann, B L AU - Hardgrove, C J AU - Jackson, R AU - Lasue, Jeremie AU - McInroy, Rhonda AU - Meslin, P Y AU - Mezzacappa, A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract P21D EP - 04 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700095714?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Understanding+chemical+trends+in+rock+surface+compositions+as+measured+by+ChemCam+at+Gale+Crater%2C+Mars%3B+the+signatures+of+rock+coatings+and+rinds+in+LIBS+laboratory+data&rft.au=Lanza%2C+Nina+L%3BClegg%2C+S+M%3BWiens%2C+R+C%3BLeveille%2C+Richard+J%3BMelikechi%2C+N%3BOllila%2C+A%3BTokar%2C+R+L%3BNewsom%2C+H+E%3BBlank%2C+J+G%3BBridges%2C+Nathan+T%3BClark%2C+B%3BDeans%2C+Matthew+C%3BDelapp%2C+D%3BEhlmann%2C+B+L%3BHardgrove%2C+C+J%3BJackson%2C+R%3BLasue%2C+Jeremie%3BMcInroy%2C+Rhonda%3BMeslin%2C+P+Y%3BMezzacappa%2C+A%3BAnonymous&rft.aulast=Lanza&rft.aufirst=Nina&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - RAGE hydrocode modeling of asteroid mitigation; new simulations with parametric studies for uncertainty quantification AN - 1696875175; 2015-066603 AB - We are performing detailed hydrodynamic simulations of the interaction from a strong explosion with sample Asteroid objects. The purpose of these simulations is to apply modern hydrodynamic codes that have been well verified and validated (V&V) to the problem of mitigating the hazard from a potentially hazardous object (PHO), an asteroid or comet that is on an Earth crossing orbit. The code we use for these simulations is the RAGE code from Los Alamos National Laboratory [1-6]. Initial runs were performed using a spherical object. Next we ran simulations using the shape form from a known asteroid: 25143 Itokawa. This particular asteroid is not a PHO but we use its shape to consider the influence of non-spherical objects. The initial work was performed using 2D cylindrically symmetric simulations and simple geometries. We then performed a major fully 3D simulation. For an Itokawa size object ( approximately 500 m) and an explosion energies ranging from 0.5 - 1 megatons, the velocities imparted to all of the PHO "rocks" in all cases were many m/s. The velocities calculated were much larger than escape velocity and would preclude re-assembly of the fragments. The dispersion of the asteroid remnants is very directional from a surface burst, with all fragments moving away from the point of the explosion. This detail can be used to time the intercept for maximum movement off the original orbit. Results from these previous studies will be summarized for background. In the new work presented here we show a variety of parametric studies around these initial simulations. We modified the explosion energy by +/- 20% and varied the internal composition from a few large "rocks" to several hundred smaller rocks. The results of these parametric studies will be presented. We have also extended our work [6],[7] to stand-off nuclear bursts and will present the initial results for the energy deposition by a generic source into the non-uniform composition asteroid. The goal of this new work is to obtain an "optimal stand-off" distance from detailed radiation transport-hydrodynamic simulations from generic explosion properties. The initial results of these two studies will also be presented. JF - American Geophysical Union Fall Meeting AU - Weaver, R AU - Plesko, C S AU - Gisler, G R AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract NH23D EP - 1556 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1696875175?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=RAGE+hydrocode+modeling+of+asteroid+mitigation%3B+new+simulations+with+parametric+studies+for+uncertainty+quantification&rft.au=Weaver%2C+R%3BPlesko%2C+C+S%3BGisler%2C+G+R%3BAnonymous&rft.aulast=Weaver&rft.aufirst=R&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Annals+of+Nuclear+Energy&rft.issn=03064549&rft_id=info:doi/10.1016%2Fj.anucene.2010.09.014 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-17 N1 - CODEN - #07548 ER - TY - JOUR T1 - Hierarchical testing with automated document generation for amanzi, ASCEM's subsurface flow and reactive transport simulator AN - 1696873725; 2015-066397 AB - The Advanced Simulation Capabililty for Environmental Management (ASCEM) program is developing an approach and open-source tool suite for standardized risk and performance assessments at legacy nuclear waste sites. These assessments use a graded and iterative approach, beginning with simplified highly abstracted models, and adding geometric and geologic complexity as understanding is gained. To build confidence in this assessment capability, extensive testing of the underlying tools is needed. Since the tools themselves, such as the subsurface flow and reactive-transport simulator, Amanzi, are under active development, testing must be both hierarchical and highly automated. In this presentation we show how we have met these requirements, by leveraging the python-based open-source documentation system called Sphinx with several other open-source tools. Sphinx builds on the restructured text tool docutils, with important extensions that include high-quality formatting of equations, and integrated plotting through matplotlib. This allows the documentation, as well as the input files for tests, benchmark and tutorial problems, to be maintained with the source code under a version control system. In addition, it enables developers to build documentation in several different formats (e.g., html and pdf) from a single source. We will highlight these features, and discuss important benefits of this approach for Amanzi. In addition, we'll show that some of ASCEM's other tools, such as the sampling provided by the Uncertainty Quantification toolset, are naturally leveraged to enable more comprehensive testing. Finally, we will highlight the integration of this hierarchical testing and documentation framework with our build system and tools (CMake, CTest, and CDash). JF - American Geophysical Union Fall Meeting AU - Moulton, J D AU - Steefel, C I AU - Yabusaki, S AU - Castleton, Karl AU - Scheibe, T D AU - Keating, E H AU - Freedman, V L AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H33B EP - 1357 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1696873725?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Hierarchical+testing+with+automated+document+generation+for+amanzi%2C+ASCEM%27s+subsurface+flow+and+reactive+transport+simulator&rft.au=Moulton%2C+J+D%3BSteefel%2C+C+I%3BYabusaki%2C+S%3BCastleton%2C+Karl%3BScheibe%2C+T+D%3BKeating%2C+E+H%3BFreedman%2C+V+L%3BAnonymous&rft.aulast=Moulton&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-17 N1 - CODEN - #07548 ER - TY - JOUR T1 - High resolution X-ray CMT imaging of supercritical CO (sub 2) in porous media; experimental challenges, solutions, and results AN - 1696873286; 2015-066296 AB - Geologic carbon dioxide (CO (sub 2) ) sequestration has been proposed as a climate change mitigation strategy to limit emissions of CO (sub 2) to the atmosphere from large fossil-fuel burning CO (sub 2) point sources; however, there are concerns associated with the long-term stability of a mobile subsurface CO (sub 2) plume. Capillary trapping of supercritical CO (sub 2) (scCO (sub 2) ), wherein the CO (sub 2) is held within the pore structure of the geologic matrix by capillary forces, is a more secure form of subsurface storage than structural trapping, which relies on an impermeable caprock to contain the buoyant CO (sub 2) plume. To understand the multiphase physics of CO (sub 2) transport, and to subsequently produce quantitative estimates of potential CO (sub 2) capillary trapping, it is necessary to study field, core, and pore-scale processes. X-ray computed microtomography (x-ray CMT) allows for three-dimensional (3D) in-situ visualization of fluid phases within and the physical structure of a porous medium at the pore-scale. We have designed and built a mobile experimental set-up capable of running at pressures up to 2000 PSI and temperatures up to 50 degrees C, made with materials that are compatible with corrosive fluids. Our experimental procedure includes pressurizing, mixing, and separating fluids; and subsequently running immiscible drainage and imbibition flow experiments with brine and supercritical CO (sub 2) . With this set-up and procedure, we successfully conducted a brine-scCO (sub 2) drainage experiment in Bentheimer sandstone at 1200 PSI and 36 degrees C, and confirmed and quantified CO (sub 2) flow in the sandstone core via synchrotron-based x-ray CMT with a resolution of 4.65 mu m at the Advanced Photon Source at Argonne National Laboratory. We have proven that we can observe, on a pore-scale basis, the movement of supercritical CO (sub 2) within a porous media. The properties of supercritical CO (sub 2) (e.g. viscosity, density, interfacial tension and solubility in brine) vary significantly with changes in pressure and temperature; consequently, precise temperature and pressure measurement is necessary, and temperature and pressure uniformity throughout flow lines and other system components is crucial for flow experiments. Additional challenges associated with the imaging process include allowing for 180 degrees of rotation of the sample and connected fluid lines and pressure sensing devices, and ensuring physical stability of the sample during scanning; all while maintaining uniform high pressure and temperature conditions. We present our methods to address these concerns, as well as preliminary results from the supercritical CO (sub 2) experiments conducted during July 2013 at the Advanced Photon Source at Argonne National Laboratory. JF - American Geophysical Union Fall Meeting AU - Herring, A L AU - Andersson, L AU - Newell, D L AU - Carey, J W AU - Wildenschild, D AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H31E EP - 1226 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1696873286?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=High+resolution+X-ray+CMT+imaging+of+supercritical+CO+%28sub+2%29+in+porous+media%3B+experimental+challenges%2C+solutions%2C+and+results&rft.au=Herring%2C+A+L%3BAndersson%2C+L%3BNewell%2C+D+L%3BCarey%2C+J+W%3BWildenschild%2C+D%3BAnonymous&rft.aulast=Herring&rft.aufirst=A&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-17 N1 - CODEN - #07548 ER - TY - JOUR T1 - Integrated assessment modeling for carbon storage risk and uncertainty quantification AN - 1696873232; 2015-066383 AB - The National Risk Assessment Partnership (NRAP) has developed tools to perform quantitative risk assessment at site-specific locations for long-term carbon storage. The approach that is being used is to divide the storage and containment system into components (e.g., reservoirs, seals, wells, groundwater aquifers), to develop detailed models for each component, to generate reduced order models (ROMs) based on the detailed models, and to reconnect the reduced order models within an integrated assessment model (IAM). CO2-PENS, developed at Los Alamos National Lab, is being used as the IAM for the simulations in this study. The benefit of this approach is that simulations of the complete system can be generated on a relatively rapid time scale so that Monte Carlo simulation can be performed. In this study, hundreds of thousands of runs of the IAMs have been generated to estimate likelihoods of the quantity of CO2 released to the atmosphere, size of aquifer impacted by pH, size of aquifer impacted by TDS, and size of aquifer with different metals concentrations. Correlations of the output variables with different reservoir, seal, wellbore, and aquifer parameters have been generated. Importance measures have been identified, and inputs have been ranked in the order of their impact on the output quantities. Presentation will describe the approach used, representative results, and implications for how the Monte Carlo analysis is implemented on uncertainty quantification. JF - American Geophysical Union Fall Meeting AU - Bromhal, G S AU - Dilmore, R AU - Pawar, R AU - Stauffer, P H AU - Gastelum, J AU - Oldenburg, C M AU - Zhang, Y AU - Chu, S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H32G EP - 03 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1696873232?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.atitle=Effect+of+Debonded+Interfaces+on+Corrosion+of+Mild+Steel+Composites+in+Supercritical+CO2-Saturated+Brines&rft.au=Han%2C+Jiabin%3BCarey%2C+J%3BZhang%2C+Jinsuo&rft.aulast=Han&rft.aufirst=Jiabin&rft.date=2011-03-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-17 N1 - CODEN - #07548 ER - TY - JOUR T1 - Dispersion and diffusion in porous media; From flow field data to upscaled stochastic trajectories AN - 1692746444; 2015-063050 AB - Dispersion and diffusion in porous media impact various large-scale physical processes such as contaminant migration and CO2 geologic sequestration. In many geophysical situations anomalous dispersive/diffusive behavior is found by observing, for example, heavy tailed distributions of contaminant concentrations. This anomalous behavior is caused by pore-scale processes and can be characterized in the most general case by non-Brownian random particle motion with correlated, non-normal, or nonstationary spatial displacements. This talk will explore a relatively general framework for modeling and identification of upscaled anomalous diffusive/dispersive phenomena by exploring the relationships between stochastic-model parameters and flow-field properties. Nonstationary increments are closely related to a nonequilibrium setting, and it will be shown how a simple model of nonstationarity can result from making a quasistatic assumption. JF - American Geophysical Union Fall Meeting AU - Vesselinov, V V AU - O'Malley, D AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract NG24A EP - 01 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692746444?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Dispersion+and+diffusion+in+porous+media%3B+From+flow+field+data+to+upscaled+stochastic+trajectories&rft.au=Vesselinov%2C+V+V%3BO%27Malley%2C+D%3BAnonymous&rft.aulast=Vesselinov&rft.aufirst=V&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Two-phase deformation of lower mantle mineral analogs AN - 1692744378; 2015-059353 AB - While much is known about preferred orientation in single phase rocks, deformation of polyphase rocks is largely unexplored. Nearly all of the Earth is composed of polymineral aggregates, including the lower mantle, which is of critical importance for understanding the geodynamic evolution of the planet. Geodynamic models predict large strains due to convection in the mantle, and polycrystal plasticity simulations suggest strong crystallographic preferred orientation (CPO). However, these models ignore interaction among phases, which is important for the lower mantle, estimated to be composed of approximately 25% soft magnesiowustite (Mg,Fe)O and approximately 70% harder Mg-perovskite (MgSiO (sub 3) ). Grains of the soft phase may become interconnected and act as a lubricant between grains of the harder phase, or the soft phase may not be interconnected, causing deformation to be absorbed by the harder phase. To study the effect of a second phase on CPO, we performed deformation experiments in the deformation-DIA (D-DIA) at the Advanced Photon Source (APS) while collecting X-ray diffraction patterns in situ. Since D-DIA cannot reach pressures of the lower mantle, we chose analog minerals halite (NaCl) and neighborite (NaMgF (sub 3) ) with the same structures and relative strengths as the original mantle minerals. Information on grain structure and distribution before and after deformation was collected using X-ray microtomography, both at the APS and the Advanced Light Source (ALS). Results from D-DIA experiments show that when present in as little as 25%, the soft phase absorbs much of the deformation, greatly reducing CPO of the harder phase. Conversely, CPO in NaCl is highest for the sample with highest NaCl content. This suggests that crystallographic orientation develops and evolves best in rocks largely composed of one mineral phase, and the addition of a second phase greatly hinders CPO, even at high strain. In addition, microtomography data shows that soft NaCl surrounds the harder grains of NaMgF (sub 3) . These findings are very encouraging, and we continue our study of two-phase deformation texture and microstructure with fast Fourier transform (FFT) modeling which takes into account interactions among grains. JF - American Geophysical Union Fall Meeting AU - Kaercher, P M AU - Zepeda-Alarcon, E AU - Lebensohn, R AU - Miyagi, Lowell M AU - Kanitpanyacharoen, J AU - Wang, Y AU - Parkinson, D AU - DeCarlo, F AU - Wenk, H AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract MR41A EP - 2344 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 17B:Geophysics of minerals and rocks UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692744378?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Two-phase+deformation+of+lower+mantle+mineral+analogs&rft.au=Kaercher%2C+P+M%3BZepeda-Alarcon%2C+E%3BLebensohn%2C+R%3BMiyagi%2C+Lowell+M%3BKanitpanyacharoen%2C+J%3BWang%2C+Y%3BParkinson%2C+D%3BDeCarlo%2C+F%3BWenk%2C+H%3BAnonymous&rft.aulast=Kaercher&rft.aufirst=P&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - What matters when and where for anomalous dispersion/diffusion AN - 1692743264; 2015-059134 AB - The classical Lagrangian model of Fickian dispersion/diffusion is given by Brownian motion of fluid particles representing contaminant migration. Brownian motion is defined via three conceptual assumptions about the distribution of (spatial) displacements: 1. The displacements are independent. 2. The displacements are stationary. 3. The displacements are normally distributed. Anomalous dispersion/diffusion occurs when one or more of these assumptions fails. Two of the hallmarks of anomalous dispersion/diffusion are nonlinear mean square displacement (often modeled as a power-law) and heavy tails. While these calling cards are important indicators of anomalous behavior, its origin is in the violation of any of the three assumptions. Anomalous behavior associated with such as violation has been observed in a variety of application areas including surface and subsurface hydrology. Anomalous dispersion/diffusion can create significant problems in efforts to characterize contaminant transport and design remediation strategies that protect groundwater resources. The impact at varied spatial and temporal scales of relaxing these assumptions in concert is not well understood. In order to gain a better understanding, a global sensitivity analysis (based on Sobol's method) of predicted contaminant concentrations at a number of spatial and temporal scales is performed with respect to the relaxation of these three assumptions. That is, the sensitivity of contaminant concentration (particle density) to variations in the degree to which the displacements are correlated, nonstationary, and non-normal is computed. The analyses are performed using the code MADS (Model Analyses for Decision Support; http://mads.lanl.gov). JF - American Geophysical Union Fall Meeting AU - O'Malley, D AU - Vesselinov, V V AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H21H EP - 1162 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692743264?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.atitle=Corrosion+and+Passivity+Behavior+of+Technetium+Waste+Forms+Exposed+to+Various+Aqueous+Environments&rft.au=Kolman%2C+David%3BJarvinen%2C+Gordon%3BMoore%2C+David%3BGoff%2C+George%3BGibson%2C+Rowena%3BCisneros%2C+Mike%3BTaylor%2C+Christopher%3BMausolf%2C+Edward%3BCzerwinski%2C+Kenneth%3BWeck%2C+Philippe%3BKim%2C+Eunja&rft.aulast=Kolman&rft.aufirst=David&rft.date=2011-03-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Brine inclusions migration in intact salt crystals under thermal gradient AN - 1692743094; 2015-059303 AB - The behavior of water contained in rock salt under the influence of thermal gradients is critical to the performance of salt as a medium for the disposal of nuclear waste. Water contained in salt can be present as discrete inclusions within intact salt crystals, at the interface between salt crystals and aggregates, and also as hydration water and structural water present in accessory minerals present in salt. Water content in pure halite salt usually rages from 0.1 to 0.5 wt.% but is significantly higher in clay rich salt, for which water content can be up to several wt.%. Under the influence of thermal gradients brine inclusions and water associated to the accessory mineral is mobilized. Previous investigations have shown brine inclusions tend to move towards the heat source through a mechanism that involves the dissolution of salt at the hot face of the brine inclusion and its precipitation at the colder side of the inclusion. Uncertainties remain on the exact parameters that define the rate of brine migration and whether it truly migrates to towards the heat source. We performed studies under controlled thermal gradients to examine the behavior of brine inclusions in single salt crystals obtained from the underground salt mine at the Waste Isolation Power Plant (WIPP). We found that the behavior of the brine inclusions under thermal gradients is dependent on the thermal gradient magnitude and the nature of the inclusion. Full inclusions (liquid only) migrate predominantly towards the heat source, but when the inclusions are large and close to the surface they fracture the salt and release water near the surface. Inclusions that migrate towards the heat source migrate through a mechanism that involves the dissolution of salt at the hot side of the inclusion and its deposition along the migration path. SEM analysis of the migration pathways shows that brine migrates through the creation of a network of square shaped hollow channels of about 10 micron diameter. The behavior of two phase inclusions (liquid and gas) in a temperature gradient is distinctly different from that of full inclusions. The brine in the two phase inclusions still migrates towards the heat source; however, the vapor phase moves away from the heat source through narrow square shaped channels. The resulting salt crystals are much more fractured and have a distinct appearance compared to salt crystals with full inclusion. The composition of the salt deposited along the migration channels changes along migration pathway. At the start of the inclusion migration pathway the deposited salt is composed of a mixture of NaCl, MgCl2, and CaCl2, with minor other elements. However, as the brine migrates towards the heat source its composition changes and it gets enriched in NaCl. JF - American Geophysical Union Fall Meeting AU - Caporuscio, Florie AU - Boukhalfa, Hakim AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract MR33A EP - 2316 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692743094?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Brine+inclusions+migration+in+intact+salt+crystals+under+thermal+gradient&rft.au=Caporuscio%2C+Florie%3BBoukhalfa%2C+Hakim%3BAnonymous&rft.aulast=Caporuscio&rft.aufirst=Florie&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Information gap decision support for contaminant remediation AN - 1692742908; 2015-059061 AB - Uncertainty quantifications and decision analyses under severe lack of information are ubiquitous in every applied field of engineering, policy, and science. A severe lack of information precludes our ability to determine unbiased probabilistic distributions for model parameters and model predictions; therefore, model and decision uncertainties due to a severe lack of information cannot be characterized probabilistically. To circumvent this problem, information gap (info-gap) theory has been developed to explicitly recognize and quantify the implications of information gaps in decision making. Here we present a decision analysis based on info-gap theory developed for a source identification problem where the locations and mass fluxes of contaminants impacting groundwater resources are unknown. The problem is characterized with a lack of information related to (1) model parameters representing contaminant migration in the aquifer, and (2) observed contamination concentration in the existing monitoring wells. These two sources of uncertainty are coupled through an inverse model where the observed concentrations are applied to estimate model parameters. The decision goal is based on contaminant predictions at points of compliance. The decision analysis is demonstrated for synthetic and real-world test cases. The applied uncertainty-quantification, decision-support techniques and computational algorithms are implemented in code MADS (Model Analyses for Decision Support; http://mads.lanl.gov). MADS is C/C++ code that provides a framework for model-based decision support. MADS performs various types of model analyses including sensitivity analysis, parameter estimation, uncertainty quantification, model calibration, selection and averaging. To perform the analyses, MADS can be coupled with any external simulators. Our efforts target development of an interactive computer-based Decision Support System (DSS) that will help domain scientist, managers, regulators, and stakeholders make decisions related to site characterization, monitoring design, and remedial activities based on data- and model-driven decision-support analyses exploiting high-performance computing. JF - American Geophysical Union Fall Meeting AU - Vesselinov, V V AU - O'Malley, D AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H14G EP - 05 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692742908?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Information+gap+decision+support+for+contaminant+remediation&rft.au=Vesselinov%2C+V+V%3BO%27Malley%2C+D%3BAnonymous&rft.aulast=Vesselinov&rft.aufirst=V&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Plutonium and cesium colloid mediated transport AN - 1692742860; 2015-059108 AB - Plutonium and cesium have been released to the environment at many different locations worldwide and are present in spent fuel at significant levels. Accurate understanding of the mechanisms that control their fate and transport in the environment is important for the management of contaminated sites, for forensic applications, and for the development of robust repositories for the disposal of spent nuclear fuel and nuclear waste. Plutonium, which can be present in the environment in multiple oxidations states and various chemical forms including amorphous oxy(hydr)oxide phases, adsorbs/adheres very strongly to geological materials and is usually immobile in all its chemical forms. However, when associated with natural colloids, it has the potential to migrate significant distances from its point of release. Like plutonium, cesium is not very mobile and tends to remain adhered to geological materials near its release point, although its transport can be enhanced by natural colloids. However, the reactivity of plutonium and cesium are very different, so their colloid-mediated transport might be significantly different in subsurface environments. In this study, we performed controlled experiments in two identically-prepared columns; one dedicated to Pu and natural colloid transport experiments, and the other to Cs and colloid experiments. Multiple flow-through experiments were conducted in each column, with the effluent solutions being collected and re-injected into the same column two times to examine the persistence and scaling behavior of the natural colloids, Pu and Cs. The data show that that a significant fraction of colloids were retained in the first elution through each column, but the eluted colloids collected from the first run transported almost conservatively in subsequent runs. Plutonium transport tracked natural colloids in the first run but deviated from the transport of natural colloids in the second and third runs. Cesium transport tracked natural colloid transport in all re-injections. The data will be discussed in terms of natural colloid properties, including size distribution and electrokinetic properties, as well as the reactive transport behavior of Pu and Cs. We will also discuss the implications of the results for colloid-mediated contaminant transport, management of contaminated sites and forensic data interpretation. JF - American Geophysical Union Fall Meeting AU - Boukhalfa, Hakim AU - Dittrich, T M AU - Reimus, P W AU - Ware, D AU - Erdmann, B AU - Wasserman, Naomi L AU - Abdel-Fattah, A I AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H21E EP - 1111 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692742860?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Plutonium+and+cesium+colloid+mediated+transport&rft.au=Boukhalfa%2C+Hakim%3BDittrich%2C+T+M%3BReimus%2C+P+W%3BWare%2C+D%3BErdmann%2C+B%3BWasserman%2C+Naomi+L%3BAbdel-Fattah%2C+A+I%3BAnonymous&rft.aulast=Boukhalfa&rft.aufirst=Hakim&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - A methodology for characterizing potential uranium transport in deep geological disposal sites AN - 1692742765; 2015-059089 AB - In order to make safe and reasonable decisions about radioactive waste disposal in deep geologic sites, it is important to understand the fate and potential transport of long half-life transuranic radionuclides over a wide range of time and distance scales. The objective of this study was to evaluate and demonstrate new experimental methods for quantifying the potential for actinide transport in deep fractured crystalline rock formations. We selected a fractured/weathered granodiorite at the Grimsel Test Site (GTS) in Switzerland as a model system because field experiments involving uranium, as well as other actinides, have already been conducted. Working on this system provides a unique opportunity to compare lab experimental results with field-scale observations. Drilled rock cores and weathered fracture fill material (FFM) from the GTS were shipped to Los Alamos National Laboratory, characterized by x-ray diffraction and microscopy, and used in batch sorption/desorption and column breakthrough experiments. Uranium solutions were made by adding uranium to a synthetic Grimsel groundwater that matched the natural water chemistry found in the GTS groundwater. Batch and breakthrough experiments were conducted using solutions between pH 6.9 and 9.0. All column experiments were conducted using syringe pumps at low flow rate (<0.3 ml h (super -1) ) in small columns containing 5 g of material with pore volumes of 2-3 ml. These small columns allow rapid and economical evaluation of sorption/desorption behavior under flowing conditions (and in duplicate or triplicate). Solutions were switched to uranium-free synthetic Grimsel groundwater after equilibration in batch experiments or after near-steady uranium breakthrough occurred in column experiments. The measurement of uranium concentrations as a function of time under these conditions allowed interrogation of desorption rates which we believe control uranium fate and transport over long time and distance scales. Uranium transport was conservative and matched tritium breakthrough for pH 9.0; however, retardation increased when pH was reduced to 7.9 and 6.9. We are currently evaluating uranium adsorption/desorption rates as a function of water chemistry (initial focus on pH), with future testing planned to evaluate the influence of carbonate concentrations, flow rates, mineralogy, bentonite colloids and other actinides (e.g., Am). JF - American Geophysical Union Fall Meeting AU - Dittrich, T M AU - Reimus, P W AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H21D EP - 1092 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692742765?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+methodology+for+characterizing+potential+uranium+transport+in+deep+geological+disposal+sites&rft.au=Dittrich%2C+T+M%3BReimus%2C+P+W%3BAnonymous&rft.aulast=Dittrich&rft.aufirst=T&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Coupling geomechanics with flow and reactive transport in PFLOTRAN for subsurface applications AN - 1692740758; 2015-059103 AB - With increase in the number of emerging subsurface applications that involve several coupled processes such as thermal, hydrological, mechanical and chemical, there is a need for computational models that are capable of simulating these processes. Some of such applications include carbon sequestration, nuclear waste disposal, enhanced geothermal systems, degradation of permafrost in the Arctic, etc. In this work, the approach to couple geomechanics with non-isothermal flow and reactive transport in PFLOTRAN is described. PFLOTRAN (http://www.pflotran.org) is a massively parallel open-source code originally developed for multiphase, non-isothermal flow and reactive transport. Details regarding the coupling algorithm, parallel framework and parallel performance is shown. Example simulations using this new multi-physics capability are also presented. JF - American Geophysical Union Fall Meeting AU - Karra, S AU - Bisht, G AU - Lichtner, Peter C AU - Hammond, G E AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H21E EP - 1106 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692740758?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Seismo-acoustic+wavefield+characterization+of+the+January+3%2C+2011+M+%28sub+L%29+4.6+Circleville+earthquake+in+Utah&rft.au=Burlacu%2C+R%3BArrowsmith%2C+S+J%3BPankow%2C+K+L%3BKoper%2C+K+D%3BHale%2C+J+M%3BStump%2C+B+W%3BHayward%2C+C%3BMagnani%2C+M+Beatrice%3BLangston%2C+Chuck&rft.aulast=Burlacu&rft.aufirst=R&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=351&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Fluid transport driven by heat-generating nuclear waste in bedded salt AN - 1692740698; 2015-059099 AB - The question of where to safely dispose high-level nuclear waste (HLW) provides ample motivation for scientific research on deep geologic disposal options. The goal of this study is to model the dominant heat and mass transport processes that would be driven by heat generating nuclear waste buried in bedded salt. The interaction between liquid brine flow towards the heat source, establishment of a heat pipe in the mine-run salt backfill, boiling, and vapor condensation leads to changes in porosity, permeability, saturation, thermal conductivity, and rheology of the salt surrounding potential waste canisters. The Finite Element Heat and Mass transfer code (FEHM) was used to simulate these highly coupled thermal, hydrological, and chemical processes. The numerical model has been tested against recent and historical experimental data to develop and improve the salt material model. We used the validated numerical model to make predictions of temperature gradients, porosity changes, and tracer behavior that will be testable in a future 2-year field-scale heater experiment to be carried out in an experimental test bed at the Waste Isolation Pilot Plant (WIPP) site near Carlsbad, NM. JF - American Geophysical Union Fall Meeting AU - Jordan, A AU - Harp, D R AU - Stauffer, P H AU - Ten Cate, J A AU - Labyed, Y AU - Boukhalfa, H AU - Lu, Z AU - Person, M A AU - Robinson, B A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H21E EP - 1102 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692740698?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Fluid+transport+driven+by+heat-generating+nuclear+waste+in+bedded+salt&rft.au=Jordan%2C+A%3BHarp%2C+D+R%3BStauffer%2C+P+H%3BTen+Cate%2C+J+A%3BLabyed%2C+Y%3BBoukhalfa%2C+H%3BLu%2C+Z%3BPerson%2C+M+A%3BRobinson%2C+B+A%3BAnonymous&rft.aulast=Jordan&rft.aufirst=A&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-07-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - High-resolution X-ray tomography imaging of supercritical CO2; investigating capillary trapping under reservoir conditions and addressing wettability alteration AN - 1689591871; 2015-056401 AB - In geological carbon sequestration, CO2 is stored in a supercritical state in subsurface reservoirs. Deep saline aquifers are particularly attractive because of their abundance and potentially large storage volumes. Despite very broad research efforts there are still substantial uncertainties related to the effectiveness of the trapping processes controlling the permanent storage of CO2. After injection of CO2 the saline water (brine) will imbibe back and reoccupy the pore space as the buoyant CO2 moves upwards. Some of the CO2 will remain behind in a trapping mechanism known as capillary trapping that occurs as CO2 bubbles are isolated by the brine inside some of the pore space. The large-scale movement of the trapped CO2 within the brine is thereby prevented. Capillary trapping thus constitutes an important storage mechanism following CO2 injection until subsequent aqueous dissolution and precipitation of carbonate minerals depletes the reservoir of free-phase CO2. We present pressure-saturation curves derived from drainage and imbibition experiments with brine and supercritical CO2 at 1200 PSI and at 36 degrees C for Bentheimer sandstone cores. We compare the supercritical CO2 experiments with ambient pressure and temperature experiments using water and air (supercritical CO2 proxy fluid) for Bentheimer sandstone. The pressure-saturation curves are accompanied with quantitative results on non-wetting phase saturation, topology and connectivity as determined from three-dimensional (3D) images. The 3D data with a resolution of 4.65 mu m were derived from high-resolution synchrotron x-ray computed micro-tomography (CMT), collected at the GSECARS beam line 13-BM-D at the Advanced Photon Source, Argonne National Laboratory. Drainage and imbibition experiments, performed under ambient pressure and temperature conditions, indicate that the topology of the non-wetting phase after drainage correlates with the final trapping of the non-wetting phase, after imbibition. Pressure-saturation curves obtained for supercritical CO2 and water at reservoir conditions (1200 PSI and 36 degrees C), point towards a wettability alteration of the Bentheimer sandstone upon contact with supercritical CO2. JF - American Geophysical Union Fall Meeting AU - Andersson, L AU - Herring, A L AU - Newell, D L AU - Carey, B AU - Wildenschild, D AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H41P EP - 03 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1689591871?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=High-resolution+X-ray+tomography+imaging+of+supercritical+CO2%3B+investigating+capillary+trapping+under+reservoir+conditions+and+addressing+wettability+alteration&rft.au=Andersson%2C+L%3BHerring%2C+A+L%3BNewell%2C+D+L%3BCarey%2C+B%3BWildenschild%2C+D%3BAnonymous&rft.aulast=Andersson&rft.aufirst=L&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Comparison of thermo-elastic and poro-elastic effects during shear stimulation of Desert Peak EGS well 27-15 using a coupled thermal-hydrological-mechanical simulator AN - 1689591721; 2015-056533 AB - High-temperature rock formations at moderate depths with low permeability are candidates for Enhanced Geothermal Systems (EGS) projects. Hydraulic stimulation can be employed in such systems to create flow paths with low hydraulic impedance while maintaining significant heat transfer area to avoid premature cooling of the formation and the creation of short-circuit flow paths. Here we present results from a coupled thermal-hydrological-mechanical numerical model of a successful EGS stimulation in well 27-15 at the Desert Peak Geothermal Field, Nevada. This stimulation was carried out over two different depth intervals and multiple injection pressures, beginning in September 2010. The subject of this study is the initial shear stimulation phase, which was carried out at depths of 0.9 to 1.1 km over a period of about 100 days. The reservoir temperature at these depths is approximately 182 to 195 degrees C. This treatment consisted of injection of 20 to 30 degrees C water at wellhead pressures (WHP) of 1.5, 2.2, 3.1 and 3.7 MPa followed by periods of shut-in. To avoid hydraulic fracturing, these pressure steps were intentionally selected to stay below the minimum principal stress measured in the well. The injectivity did not change at WHP steps of 1.5 and 2.2 MPa, but improved significantly during injection at 3.1 MPa, from about 0.1 to 1.5 kg s-1 MPa-1. This improvement was attributed to self-propping shear failure of pre-existing natural fractures. The model incorporates physical processes thought to be important during this low-pressure shear stimulation phase. The relatively long periods of injection of water that was significantly cooler than the ambient formation temperature required incorporating in the model both thermo-mechanical and poroelastic effects, which were coupled to fluid flow via Mohr-Coulomb failure and shear-induced increases in fracture permeability. This model resulted in a good match to the wellhead injection data recorded during the stimulation. This numerical model was also used to separate the thermo-mechanical and poroelastic effects, compare their spatial and temporal evolution and carry out sensitivity analyses. To varying degrees, model results depended on variations in permeability anisotropy, elastic and thermal rock properties, Mohr-Coulomb parameters of static and dynamic friction and cohesion, shear-dilatation parameters, injection pressure and length of the injection zone. The thermoelastic and poroelastic effects are realized over different time scales, and their magnitudes are governed by different material properties; in general, model results show greater sensitivity to variations in the coefficient of thermal expansion than in the Biot poroelastic factor. Both thermal and poroelastic contributions to stressing of fractures significantly impact the onset as well as the magnitude of shear-induced permeability gains realized during this low-pressure stimulation. JF - American Geophysical Union Fall Meeting AU - Kelkar, S AU - Dempsey, D AU - Hickman, S H AU - Davatzes, N C AU - Moos, D AU - Zemach, E AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H54B EP - 05 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1689591721?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Comparison+of+thermo-elastic+and+poro-elastic+effects+during+shear+stimulation+of+Desert+Peak+EGS+well+27-15+using+a+coupled+thermal-hydrological-mechanical+simulator&rft.au=Kelkar%2C+S%3BDempsey%2C+D%3BHickman%2C+S+H%3BDavatzes%2C+N+C%3BMoos%2C+D%3BZemach%2C+E%3BAnonymous&rft.aulast=Kelkar&rft.aufirst=S&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Probing shock compressed silicon metallization using VIS/NIR reflectivity AN - 1689591399; 2015-056641 AB - Broadband reflectivity measurements provide detailed information about the optical and electronic properties of shocked matter, complementing other spectroscopic techniques and increasing the accuracy of pyrometric measurements, which is vital for improving models of planetary cores. A time resolved broadband VIS/NIR reflectivity diagnostic was constructed and used to observe the metallization of shock compressed single crystal silicon phase at Jupiter Laser Facility at Lawrence Livermore National Lab. Silicon is the second most abundant element in the Earth's crust and was considered to be an excellent candidate for initial testing of this diagnostic due to accessible phase changes that should result in dramatic increases in reflectivity. A 50-100 fs 800 nm pulse was first sent through a pulse stacker and then an intense white light pulse with wavelengths from approximately 400 nm to approximately 1200 nm was generated by focusing the stacked pulses into a water cell. The white light pulses were then sent into the chamber and reflected from the target surface. The reflected light was dispersed using a custom spectrometer which was coupled to a streak camera. On transition to the higher pressure phase a dramatic increase in reflectivity was observed in the NIR, and to a lesser extent in the visible. This is congruent with the decrease in resistivity that accompanies closure of the silicon band gap and metallization. JF - American Geophysical Union Fall Meeting AU - Ali, S J AU - Bolme, C AU - Jeanloz, R AU - Collins, G W AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract MR23B EP - 2367 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1689591399?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Probing+shock+compressed+silicon+metallization+using+VIS%2FNIR+reflectivity&rft.au=Ali%2C+S+J%3BBolme%2C+C%3BJeanloz%2C+R%3BCollins%2C+G+W%3BAnonymous&rft.aulast=Ali&rft.aufirst=S&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Pore characteristics and their emergent effect on water adsorption and transport in clays using small-angle neutron scattering with contrast variation AN - 1689589130; 2015-053614 AB - In nuclear waste management, clays are canonical materials in the construction of engineered barriers. They are also naturally occurring reactive minerals which play an important role in retention and colloidal facilitated reactive transport in subsurface systems. Knowledge of total and accessible porosity in clays is crucial in determining fluids transport behavior in clays. It will provide fundamental insight on the performance efficiency of specific clays as a barrier material and their role in regulating radionuclide transport in subsurface environments. The aim of the present work is to experimentally investigate the change in pore characteristics of clays as function of moisture content, and to determine their pore character in relation to their water retention capacity. Recent developments in small-angle neutron scattering (SANS) techniques allow quantitative measurement of pore morphology and size distribution of various materials in their pristine state under various sample environments (exposure to solution, high temperature, and so on). Furthermore, due to dramatic different neutron scattering properties of hydrogen and deuterium, one can readily use contrast variation, which is the isotopic labeling with various ratios of H and D (e.g. mixture of H2O/D2O) to highlight or suppress features of the sample. This is particularly useful in the study of complex pore system such as clays. In this study, we have characterized the pore structures for a number of clays including clay minerals and field samples which are relevant to high-level waste systems under various sample environments (e.g., humidity, temperature and pressure) using SANS. Our results suggest that different clays show unique pore features under various sample environments. To distinguish between accessible/non-accessible pores and the nature of pore filling (e.g. the quantity of H2O adsorbed by clays, and the distribution of H2O in relation to pore character) to water, clays were exposed for various periods to a specific humidity (e.g., relative humidity: RH=100%, RH=75%). The humidity is controlled by using saturated aqueous solutions, consisting of specific H2O/D2O mixtures. Our results have shown distinct variations in water adsorption and moisture diffusivity among clays. Our results allow us to obtain on the pore scale porosity changes due to water movement in clays. As emergent transport property, nano- to micro-scale structural characterization is crucial in providing insights into pore-scale transport processes, which are pertinent to upscale continuum model development involving flow and transport at low water content, flow and phase behavior under confinement, and low-permeability media. JF - American Geophysical Union Fall Meeting AU - Ding, M AU - Hartl, M AU - Wang, Y AU - Hjelm, R AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H33L EP - 04 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1689589130?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Pore+characteristics+and+their+emergent+effect+on+water+adsorption+and+transport+in+clays+using+small-angle+neutron+scattering+with+contrast+variation&rft.au=Ding%2C+M%3BHartl%2C+M%3BWang%2C+Y%3BHjelm%2C+R%3BAnonymous&rft.aulast=Ding&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Sensitivity of permafrost dominated river and stream banks to climate change AN - 1686059190; 2015-050684 AB - River systems in permafrost environments may be particularly sensitive to climate-induced changes in hydrology, water temperature, and air temperatures. In these systems, the rate of bank erosion may be significantly influenced by the presence of permafrost and the rate the permafrost thaw. Using analysis of remote sensing imagery and field studies, we attempt quantification of the spatial and temporal patterns of river bank erosion to understand the controls on river planform dynamics in permafrost settings. The rate that river banks erode in permafrost settings represents a balance between the rate at which bank material may thaw and become mobile and the rate at which mobile material may be transported away from the river bank. Along steep banks in large river systems with a significant discharge throughout the open water season, such at the Yukon River, fine-grained (silt and sand) sediments may be removed as quickly as they are thawed. In these systems, the maximum rate of bank retreat is effectively thermally limited and may be sensitive to climate changes that increase the rate of permafrost thaw, such as water and air (to a lesser degree) temperature increases. In contrast, in smaller river systems, like the Selawik River in northwest Alaska, highly seasonal discharge, heterogeneous floodplain deposits, and bank vegetation all lead to significant variability in the spatial and temporal rates of bank erosion. At one riverbank site monitored between 2010 and 2012, yearly retreat rates varied from 0 m/yr to 5 m/yr (the long term average measured from aerial photos and satellite imagery). However, in the year with a retreat of 5 m the erosion occurred over a 5-day time period corresponding to peak snow melt discharges. The year with no observable bank retreat followed a winter season with very little snow pack and reduced spring discharge. These observations suggest that in small systems with highly seasonal flows, small changes in river hydrographs, such as changes in the duration of peak flows by a few days, have the potential to significantly change riverbank erosion rates. In the Selawik, spring bank erosion often leads to bank undercutting that produces large mats of tundra vegetation that drape or fall onto the bank face. It appears that these vegetation mats may protect the banks from further erosion over the course of the summer, even during discharge events with stages close to those observed during snow melt. At locations where the vegetation mats do not re-freeze to the bank face, spring ice out appears to remove the prior season's mats thereby exposing the banks to fresh erosion. Mats that become frozen within the winter ice cover may be carried away with the ice, while mats higher on the bank or attached to the surface tundra may be abraded by ice rafts carried in the flow. Hydrological changes that affect the timing and magnitude of spring ice out flows may also alter this erosional dynamic with the riparian vegetation. Our observations suggest that the response of river planform dynamics to climate-induced changes in arctic freshwater systems may be quite complex and exhibit significant spatial and temporal heterogeneity. JF - American Geophysical Union Fall Meeting AU - Rowland, J C AU - Gangodagamage, C AU - Crosby, B T AU - Pope, P A AU - Brumby, S P AU - Wilson, C J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H41B EP - 1234 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686059190?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Sensitivity+of+permafrost+dominated+river+and+stream+banks+to+climate+change&rft.au=Rowland%2C+J+C%3BGangodagamage%2C+C%3BCrosby%2C+B+T%3BPope%2C+P+A%3BBrumby%2C+S+P%3BWilson%2C+C+J%3BAnonymous&rft.aulast=Rowland&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - On the influence of strain rate in acousto-elasticity; experimental results for Berea Sandstone AN - 1686058940; 2015-049102 AB - Elastic nonlinear effects are pervasive in the Earth, including during strong ground motion, tidal forcing and earthquake slip processes. We study elastic nonlinear effects in the laboratory with the goal of developing new methods to probe elastic changes in the Earth, and to characterize and understand their origins. Here we report on nonlinear, frequency dispersion effects by applying a method termed dynamic acousto-elasticity (DAE), analogous to quasi-static acousto-elasticity. DAE allows one to obtain the elastic behavior over the entire dynamic cycle, detailing the full nonlinear behavior under tension and compression, including hysteresis and memory effects. We perform DAE on samples of Berea sandstone subject to 0.5 MPa uniaxial and biaxial loading conditions with oscillating loads at frequencies from 0.001 to 10 Hz and amplitudes of a few 100 kPa. We compare results to DAE measurements made in the kHz range. We observe that the average decrease in modulus due to nonlinear material softening increases with frequency, suggesting a frequency and/or a strain rate dependence. Previous quasi-static measurements (Claytor et al., GRL 2009) show that stress-strain nonlinear hysteretic behavior disappears when the experiment is performed at a very low strain-rate, implying that a rate dependent nonlinear elastic model would be useful (Gusev et al., PRB 2004). Our results also suggest that when elastic nonlinear Earth processes are studied, stress forcing frequency is an important consideration, and may lead to unexpected behaviors. JF - American Geophysical Union Fall Meeting AU - Riviere, Jacques V AU - Candela, T AU - Scuderi, M AU - Marone, C AU - Guyer, R A AU - Johnson, P A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract MR13A EP - 2246 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 06A:Sedimentary petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686058940?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=On+the+influence+of+strain+rate+in+acousto-elasticity%3B+experimental+results+for+Berea+Sandstone&rft.au=Riviere%2C+Jacques+V%3BCandela%2C+T%3BScuderi%2C+M%3BMarone%2C+C%3BGuyer%2C+R+A%3BJohnson%2C+P+A%3BAnonymous&rft.aulast=Riviere&rft.aufirst=Jacques&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - A method for capturing sub-gridscale interactions in numerical simulation of flow and reactive transport in power-law media AN - 1686058716; 2015-048976 AB - For nonlinear, coupled flow and reactive transport in heterogeneous systems, capturing sub-gridscale dynamics is a serious challenge for coarse-grained numerical simulation. Even simply for linear, uncomplicated flow systems, accurate estimation of sub-gridscale effects may require averaging over a possibly tensor, multi-scale permeability distribution. Stochastic process modeling and statistical analysis methods are available and are being improved for calculating average and variance properties of flow and transport systems. Frequently, in addition to the average dynamics, a solution for an individual realization, or for many realizations, is desired or required. For media whose smaller-scale heterogeneity can be approximated by a power law (fractal) model (and this is approximately true for many soils), fractal interpolating functions, constrained by measured properties and distributions, provide an efficient way to capture sub-gridscale dynamics for individual realizations. An advantage of this approach is that it can be incorporated readily into conventional finite difference or finite element flow and transport codes, providing a multi-resolution solution for less cost than a finely-grained one. Several examples illustrate the potential usefulness of this approach for numerical simulation of flow and reactive transport in heterogeneous media. Comparisons are made to finely gridded traditional numerical solutions. Limitations and conditions of use are discussed. JF - American Geophysical Union Fall Meeting AU - Travis, B J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H23I EP - 01 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686058716?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+method+for+capturing+sub-gridscale+interactions+in+numerical+simulation+of+flow+and+reactive+transport+in+power-law+media&rft.au=Travis%2C+B+J%3BAnonymous&rft.aulast=Travis&rft.aufirst=B&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Modeling CO (sub 2) gas migration of shallow subsurface CO (sub 2) leakage experiments AN - 1686056993; 2015-046450 AB - Leakage of injected CO (sub 2) into shallow subsurface aquifers or back into the atmosphere at geologic carbon sequestration sites is a risk that must be minimized. One potential CO (sub 2) leakage pathway involves the transport of dissolved CO (sub 2) into a shallow aquifer where the CO (sub 2) exsolves, forming a free CO (sub 2) gas phase that subsequently migrates through the aquifer. In order to reduce the negative effects of CO (sub 2) exsolution, it is important to fully understand each of the processes controlling the movement CO (sub 2) , as well as the effects of aquifer heterogeneity on the overall fate and transport of CO (sub 2) . In this work, we present multiphase flow simulations of intermediate scale CO (sub 2) exsolution experiments. The multiphase flow simulations were carried out using the Finite Element Heat and Mass Transfer code (FEHM) developed at Los Alamos National Laboratory. Simulations were first designed to model experiments conducted in two different homogeneous packed sands. PEST (Parameter Estimation and Uncertainty Analysis) was used to optimize multiphase flow parameters (i.e., porosity, permeability, relative permeability, and capillary pressure) within FEHM. The optimized parameters were subsequently used to model heterogeneous experiments consisting of various packing configurations using the same sands. Comparisons of CO (sub 2) saturation between experiments and simulations will be presented and analyzed. JF - American Geophysical Union Fall Meeting AU - Porter, M L AU - Plampin, M R AU - Pawar, Rajesh AU - Illangasekare, Tissa H AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H23B EP - 1259 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686056993?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Modeling+CO+%28sub+2%29+gas+migration+of+shallow+subsurface+CO+%28sub+2%29+leakage+experiments&rft.au=Porter%2C+M+L%3BPlampin%2C+M+R%3BPawar%2C+Rajesh%3BIllangasekare%2C+Tissa+H%3BAnonymous&rft.aulast=Porter&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=08950695&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Measurement and evaluation of the relationships between capillary pressure, relative permeability, and saturation for surrogate fluids for laboratory study of geological carbon sequestration AN - 1686056886; 2015-046455 AB - Multiphase flow models can be used to improve our understanding of the complex behavior of supercritical CO2 (scCO2) in deep saline aquifers to make predictions for the stable storage strategies. These models rely on constitutive relationships such as capillary pressure (Pc)-saturation (Sw) and relative permeability (kr)-saturation (Sw) as input parameters. However, for practical application of these models, such relationships for scCO2 and brine system are not readily available for geological formations. This is due to the complicated and expensive traditional methods often used to obtain these relationships in the laboratory through high pressure and/or high-temperature controls. A method that has the potential to overcome the difficulty in conducting such experiments is to replicate scCO2 and brine with surrogate fluids that capture the density and viscosity effects to obtain the constitutive relationships under ambient conditions. This study presents an investigation conducted to evaluate this method. An assessment of the method allows us to evaluate the prediction accuracy of multiphase models using the constitutive relationships developed from this approach. With this as a goal, the study reports multiple laboratory column experiments conducted to measure these relationships. The obtained relationships were then used in the multiphase flow simulator TOUGH2 T2VOC to explore capillary trapping mechanisms of scCO2. A comparison of the model simulation to experimental observation was used to assess the accuracy of the measured constitutive relationships. Experimental data confirmed, as expected, that the scaling method cannot be used to obtain the residual and irreducible saturations. The results also showed that the van Genuchten-Mualem model was not able to match the independently measured kr data obtained from column experiments. Simulated results of fluid saturations were compared with saturation measurements obtained using x-ray attenuations. This comparison demonstrated that the experimentally derived constitutive relationships matched the experimental data more accurately than the simulation using constitutive relationships derived from scaling methods and van Genuchten-Mualem model. However, simulated imbibition fronts did not match well, suggesting the need for further study. In general, the study demonstrated the feasibility of using surrogate fluids to obtain both Pc-Sw and kr-Sw relationships to be used in multiphase models of scCO2 migration and entrapment. JF - American Geophysical Union Fall Meeting AU - Mori, Hiroko AU - Trevisan, L AU - Sakaki, Toshihiro AU - Cihan, A AU - Smits, K M AU - Illangasekare, Tissa H AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H23B EP - 1264 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686056886?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Measurement+and+evaluation+of+the+relationships+between+capillary+pressure%2C+relative+permeability%2C+and+saturation+for+surrogate+fluids+for+laboratory+study+of+geological+carbon+sequestration&rft.au=Mori%2C+Hiroko%3BTrevisan%2C+L%3BSakaki%2C+Toshihiro%3BCihan%2C+A%3BSmits%2C+K+M%3BIllangasekare%2C+Tissa+H%3BAnonymous&rft.aulast=Mori&rft.aufirst=Hiroko&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Fundamental study on the dynamics of heterogeneity-enhanced CO2 gas evolution in the shallow subsurface during possible leakage from deep geologic storage sites AN - 1686056461; 2015-046454 AB - A concern for geologic carbon sequestration is the potential for CO2 stored in deep geologic formations to leak upward into shallow freshwater aquifers where it can have potentially detrimental impacts to the environment and human health. Understanding the mechanisms of CO2 exsolution, migration and accumulation (collectively referred to as "gas evolution") in the shallow subsurface is critical to predict and mitigate the environmental impacts. During leakage, CO2 can move either as free-phase or as a dissolved component of formation brine. CO2 dissolved in brine may travel upward into shallow freshwater systems, and the gas may be released from solution. In the shallow aquifer, the exsolved gas may accumulate near interfaces between soil types, and/or create flow paths that allow the gas to escape through the vadose zone to the atmosphere. The process of gas evolution in the shallow subsurface is controlled by various factors, including temperature, dissolved CO2 concentration, water pressure, background water flow rate, and geologic heterogeneity. However, the conditions under which heterogeneity controls gas phase evolution have not yet been precisely defined and can therefore not yet be incorporated into models used for environmental risk assessment. The primary goal of this study is to conduct controlled laboratory experiments to help fill this knowledge gap. With this as a goal, a series of intermediate-scale laboratory experiments were conducted to observe CO2 gas evolution in porous media at multiple scales. Deionized water was saturated with dissolved CO2 gas under a specified pressure (the saturation pressure) before being injected at a constant volumetric flow rate into the bottom of a 1.7 meter-tall by 5.7 centimeter-diameter column or a 2.4 meter-tall by 40 centimeter-wide column that were both filled with sand in various heterogeneous packing configurations. Both test systems were initially saturated with fresh water and instrumented with soil moisture sensors to monitor the evolution of gas phase through time by measuring the average water content in small sampling volumes of soil. Tensiometers allowed for observation of water pressure through space and time in the test systems, and a computer-interfaced electronic scale continuously monitored the outflow of water from the top of the two test columns. Several packing configurations with five different types of sands were used in order to test the effects of various pore size contrasts and interface shapes on the evolution of the gas phase near soil texture transitions in the heterogeneous packings. Results indicate that: (1) heterogeneity affects gas phase evolution patterns within a predictable range of conditions quantified by the newly introduced term "oversaturation," (2) soil transition interfaces where less permeable material overlies more permeable material have a much more pronounced effect on gas evolution than interfaces with opposite orientations, and (3) anticlines (or stratigraphic traps) cause significantly greater gas accumulation than horizontal interfaces. Further work is underway to apply these findings to more realistic, two-dimensional scenarios, and to assess how well existing numerical models can capture these processes. JF - American Geophysical Union Fall Meeting AU - Plampin, M R AU - Lassen, R N AU - Sakaki, Toshihiro AU - Pawar, Rajesh AU - Jensen, K H AU - Illangasekare, Tissa H AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H23B EP - 1263 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686056461?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Fundamental+study+on+the+dynamics+of+heterogeneity-enhanced+CO2+gas+evolution+in+the+shallow+subsurface+during+possible+leakage+from+deep+geologic+storage+sites&rft.au=Plampin%2C+M+R%3BLassen%2C+R+N%3BSakaki%2C+Toshihiro%3BPawar%2C+Rajesh%3BJensen%2C+K+H%3BIllangasekare%2C+Tissa+H%3BAnonymous&rft.aulast=Plampin&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Capturing coupled effects of CO (sub 2) and brine leakage in cemented wellbores at CO (sub 2) storage sites using decoupled reduced order models AN - 1686055537; 2015-046462 AB - Understanding the potential significance and risk of CO2 and brine leakage from wells at proposed geologic storage sites is a key goal of the National Risk Assessment Partnership (NRAP). In this study, we developed reduced order models (ROMs) of cemented-wellbore leakage that are being incorporated into systems models in order to determine CO2 storage risk profiles. ROMs are used to capture general trends in numerically simulated leakage in a computationally efficient manner, allowing for large numbers of evaluations required by stochastic evaluations of risk. In this study, we perform the wellbore leakage numerical simulations using the multi-phase Finite Element Heat and Mass (FEHM) code. The constituents of interest are water, supercritical CO2, dissolved CO2, liquid CO2, and gaseous CO2. The computational domain is a full 3D mesh with a 0.1 m wellbore at the center. A storage reservoir is located below the impermeable rock and the wellbore is connected directly to the atmosphere or to a shallow aquifer above. Injector wells introduce CO2 into the reservoir for 20 years followed by a 30 year relaxation period. Reservoir depth, cement permeability, relative permeability model parameters, and injection rate are sampled by Latin Hypercube sampling. For each sample, simulations are performed with and without a wellbore in the model. Transient pressures and CO2 saturations are collected at the top of the reservoir at the location where the wellbore would be located from the model without a wellbore. CO2 and brine flow rates (leakage) are collected near the top of the wellbore from the models with a wellbore. ROM model inputs are the sampled parameters, transient pressures and CO2 saturations and their first and second derivatives calculated by backward finite differences. Using these inputs, ROMs are generated for CO2 and brine leakage using the Multivariate Adaptive Regression Splines (MARS) regression technique. ROM development, evaluation, and use will be discussed. Key results show that ROMs can be developed that capture coupled effects, such as the effects of the reduction in CO2 saturation following leakage on the leakage rate, within a decoupled ROM. JF - American Geophysical Union Fall Meeting AU - Harp, D R AU - Carey, J W AU - Pawar, Rajesh AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H23B EP - 1271 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686055537?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Constraining+Pn+geometric+spreading+with+observed+amplitudes+in+Asia&rft.au=Yang%2C+X%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Yang&rft.aufirst=X&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=294&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Sediment failure during injection of CO2 into deep ocean sediments; reservoir engineering AN - 1686055413; 2015-046402 AB - At seafloor depths beneath the 2.7 km carbon dioxide/water density inversion in the ocean, CO2 is denser than water and sinks. Therefore, CO2 injected into deep ocean sediments may be buoyancy-trapped and may not require an impermeable caprock to prevent upward migration. Overlying sediments provide a diffusion-limited transport barrier, but more critically must provide the geomechanical stability to allow for CO2 injection. While there are some permeable sandy sediments at the necessary seafloor depths, the dominant pelagic lithologies are impermeable clays and low-permeability calcareous oozes. Pelagic calcareous ooze diagenesis generally results solely from the compressional weight of overlying sediments. Nearly-monotonically decreasing porosity and hence decreasing permeability lead to increasing stresses and material strengths with depth below the seafloor. Permeabilities in pelagic calcareous sediments are in the 1-100 microDarcy range, comparable to permeabilities found in tight oil and shale gas fields where fracturing is required to increase production. Previously (1) we used LANL's Finite Element Heat and Mass Transfer Code (FEHM) to show that in this system shear failure will precede hydraulic fracturing and that the shear failure breakdown zone propagates to the seafloor ahead of the CO2 front. FEHM models the flow of both CO2 and water while solving for the geomechanical stress state. Shear failure due to injection overpressure is simulated as an increase in permeability along failed nodes. Here we present updated results for CO2 injection from a vertical well into an idealized 3-D model with and without shear failure. The effect of variations in injection interval depth, seafloor depth, injection rate, fracturing pressure, permeability, porosity, and rock strength are presented. Finally, we present a comparison of several different reservoir engineering scenarios with the aim of maximizing total injected CO2 while avoiding CO2 reaching the seafloor. JF - American Geophysical Union Fall Meeting AU - Stauffer, P H AU - Levine, J AU - Dempsey, D AU - Kelkar, S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H21L EP - 01 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686055413?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Sediment+failure+during+injection+of+CO2+into+deep+ocean+sediments%3B+reservoir+engineering&rft.au=Stauffer%2C+P+H%3BLevine%2C+J%3BDempsey%2C+D%3BKelkar%2C+S%3BAnonymous&rft.aulast=Stauffer&rft.aufirst=P&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Experimental and computational studies of coupled geomechanical and hydrologic processes in wellbore systems AN - 1680756241; 2015-043291 AB - Potential leakage from wells is an important issue in the protection of groundwater resources, CO (sub 2) sequestration, and hydraulic fracturing. The first defense in all of these applications is a properly constructed well with adequate Portland cement that effectively isolates the subsurface. The chief threat for such wells is mechanical disruption of the cement, cement/steel, or cement/caprock interfaces. This can occur through wellbore operations that pressurize/depressurize the steel tubing or create temperature transients (e.g., injection, production, hydraulic fracturing, and mechanical testing) as well as reservoir-scale stresses (e.g., filling or depletion of the reservoir) and tectonic stresses (e.g., the mobility of salt). However, there is relatively limited information available on the hydrologic consequences of such processes. Toward this end, we discuss recent experiments and computational models of coupled geomechanical and hydrologic processes in wellbore systems. Triaxial coreflood experiments with tomography were conducted on synthetic wellbore systems including cement-steel, rock-cement and rock-cement-steel composites. The aim of the experiments was to induce stresses through application of axial loads in order to create defects within the cement or at the cement/steel or cement/rock interface. High injection fluid pressures (supercritical CO (sub 2) + or -brine) were applied to the base of the initially impermeable composites. Mechanical failure resulted in creation of permeability, which was measured as a function of time (allowing for the possibility of Portland cement to deform and modify permeability). In addition, fracture patterns were characterized using x-ray tomography. We used the computer code FEHM to study coupled hydrologic and mechanical processes in the near-wellbore environment. The wellbore model was developed as a wedge within a radially symmetric 3D volume. The grid elements consist of the steel casing, the casing-cement interface, the cement, the cement-rock interface, caprock, and reservoir rock. We used a model that is 1 m in radius, and extends 5 m along the wellbore. The model consisted of a lower storage aquifer, a caprock and an upper aquifer that received leaking fluids. We coupled flow and geomechanics using a shear-failure model that represents shear-induced damage and is similar to a Mohr-Coulomb slip mechanism. In this model, damage occurs for any excess shear stress with permeability enhancement a function of stress with a maximum magnitude set by the user. Stresses were induced by application of an elevated constant pressure within the injection reservoir representing a far-field injection process. The initial permeability of the cement was 1 mD and stress-enhanced permeability was limited to an increase by a factor of 10-100. The simulations show that shear-failure modes lead to enhanced permeability of the wellbore system. Continuing work will examine sensitivity of the results to mechanical properties and initial permeability distributions, the impact of relative permeability models, and the development of permeability-stress models including an aperture-opening tensile-failure model. JF - American Geophysical Union Fall Meeting AU - Carey, J W AU - Mori, Hitoko AU - Porter, M L AU - Lewis, Kayla S AU - Kelkar, S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H12C EP - 01 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680756241?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Experimental+and+computational+studies+of+coupled+geomechanical+and+hydrologic+processes+in+wellbore+systems&rft.au=Carey%2C+J+W%3BMori%2C+Hitoko%3BPorter%2C+M+L%3BLewis%2C+Kayla+S%3BKelkar%2C+S%3BAnonymous&rft.aulast=Carey&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - Passive injection; a CO (sub 2) sequestration strategy that mitigates the threat of induced seismicity and brine migration AN - 1680756210; 2015-043285 AB - Large-scale deployment of carbon capture and storage (CCS) faces several challenges including the possibility of shear movement on faults leading to the creation of CO (sub 2) leakage pathways and induced seismicity, and the migration of the brine displaced by CO (sub 2) into shallow groundwater aquifers, either through leaky wells or faults. Both of these processes are caused by fluid overpressure in the reservoir that a result of large-scale CO (sub 2) injection. We detail a novel strategy for CCS, termed passive injection, capable of emplacing megaton quantities of CO (sub 2) with no increase, transient or long-term, in reservoir pressure. The strategy leverages negative pressure gradients created by the strategic placement of brine production wells so that CO (sub 2) leaves an injection well at ambient reservoir pressure. A multi-stage, square-ring well configuration is considered, in which brine production wells are repurposed for CO (sub 2) injection upon CO (sub 2) breakthrough, and a new battery of production wells installed at a greater distance. As proof of concept, numerical simulations of passive injection are presented using the coupled thermo-hydro-mechanical (THM), multi-fluid simulator FEHM. We consider CO (sub 2) injection into a 3 km-deep, confined reservoir over a period of 50 years, with up to four stages of injection and production depending on well-spacing and production pressures. Injection rates as high as 3 Mt yr-1 are achieved, with 70% utilization of the reservoir volume and long-term mass production of brine approximately 1.7 times that of CO (sub 2) sequestered (including structural and solubility trapping). The model accounts for the geomechanical effects of reservoir drawdown including surface subsidence. The induced seismic threat is quantified in terms of the change in the Coulomb Failure Stress (Delta CFS) for the conservative scenario of an optimally-oriented fault in an extensional tectonic regime. This quantity is shown to be negative in both the caprock and reservoir, which indicates that the risk of fault reactivation has actually lessened at the conclusion of the injection operation. JF - American Geophysical Union Fall Meeting AU - Dempsey, D AU - Pawar, Rajesh AU - Kelkar, S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H11M EP - 04 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680756210?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Passive+injection%3B+a+CO+%28sub+2%29+sequestration+strategy+that+mitigates+the+threat+of+induced+seismicity+and+brine+migration&rft.au=Begnaud%2C+M+L%3BMyers%2C+S+C%3BBallard%2C+S%3BPhillips%2C+W+S%3BPasyanos%2C+M+E%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Begnaud&rft.aufirst=M&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=291&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - Hydrologic windows and the formation of low-temperature geothermal anomalies along the Rio Grande Rift, New Mexico AN - 1680755351; 2015-043251 AB - Within the Rio Grande Rift in New Mexico, gaps in Mesozoic and Tertiary confining units are common geologic features. They are created as a result of fault block rotation, erosion, lithological variations and emplacement of magmatic intrusions. These hydrologic windows were first proposed by Witcher (1988, Geothermal resources of southwestern New Mexico and southeastern Arizona: New Mexico Geological Society 39th Field Conference Guidebook, p. 191-197) as a mechanism to permit relatively hot geothermal fluids to discharge at the surface within the Rio Grande Rift. To explore the role of hydrologic windows in these occurrences, we have developed two-dimensional and three-dimensional hydrothermal models of both the Socorro and the Truth or Consequences geothermal resource areas. These finite-element models simulate groundwater flow, heat transfer, solute transport, and residence times. The 2D cross-sectional models help establish the depth of geothermal fluid circulation and crystalline-basement permeability structure required to account for hot-spring temperature conditions near the surface. The three-dimensional models help to assess the effects of water-table configuration and east-west oriented accommodation zones on shallow heat-flow patterns. We utilized carbon-14 groundwater age dating, salinity, and silica concentrations collected from wells and warm springs to calibrate these models. Apparent carbon-14 ages of groundwater samples collected from the 300-meter deep Woods Tunnel geothermal slim hole near Socorro and a 15-meter deep alluvial well from the Riverbend Spa in Truth or Consequences were 20,000 and 6,000 years old, respectively. Maximum geothermal temperatures based on silica concentrations at these two sites are estimated to range from 60 to 87 degrees Celsius. In order to reproduce observed temperature anomalies and groundwater residence times, groundwater circulation must have been within the crystalline basement, two to six kilometers beneath overlying Paleozoic sedimentary rocks. This implies that the permeability of the crystalline basement must be relatively high (between 10 to 1000 mD) in order to permit such deep circulation of groundwater. Hydrologic windows in overlying sediments then serve as conduits for these fluids to surface relatively rapidly. This phenomenon results in less cooling of the fluids as they rise to surface, thereby allowing the formation of surficial low-temperature geothermal systems. It is then apparent that where some hydrologic windows occur, groundwater circulation is not confined to the basin fill and crystalline basement permeability approaches or exceeds values typically assigned to shallower unconfined aquifers. JF - American Geophysical Union Fall Meeting AU - Pepin, J AU - Person, M A AU - Kelley, S AU - Timmons, Stacy AU - Owens, L AU - Witcher, Jim C AU - Phillips, F M AU - Gable, C W AU - Coblentz, D D AU - Campbell, A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract H11H EP - 1238 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680755351?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Hydrologic+windows+and+the+formation+of+low-temperature+geothermal+anomalies+along+the+Rio+Grande+Rift%2C+New+Mexico&rft.au=Pepin%2C+J%3BPerson%2C+M+A%3BKelley%2C+S%3BTimmons%2C+Stacy%3BOwens%2C+L%3BWitcher%2C+Jim+C%3BPhillips%2C+F+M%3BGable%2C+C+W%3BCoblentz%2C+D+D%3BCampbell%2C+A%3BAnonymous&rft.aulast=Pepin&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - Parameter estimation for grounding-line transition AN - 1680752397; 2015-040570 AB - Ice sheets and ice shelves are linked by the transition zone, the region where the grounded ice lifts off the bedrock and begins to float. Adequate resolution of the transition zone is necessary for numerically accurate ice sheet--ice shelf simulations. The required resolution depends on how the basal physics is parameterized. We propose a new physically based parameterization of the basal shear stress in a one-dimensional vertically integrated model. This parameterization increases physical realism by accounting for a simple hydrological system at the ice-sheet bed with connectivity to the ocean. Our model produces a smooth transition between finite basal friction in the ice sheet and zero basal friction in the ice shelf. We show that for fixed-grid resolution of approximately 1 km, a smoother basal shear stress reduces numerical errors in grounding-line dynamics. We explore the benefit of our physically based parameterization as compared with purely numerical techniques for regularizing stresses near the grounding line. JF - American Geophysical Union Fall Meeting AU - Leguy, G AU - Asay-Davis, X AU - Lipscomb, W H AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C53B EP - 0575 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680752397?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Parameter+estimation+for+grounding-line+transition&rft.au=Leguy%2C+G%3BAsay-Davis%2C+X%3BLipscomb%2C+W+H%3BAnonymous&rft.aulast=Leguy&rft.aufirst=G&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - Magnetic structure of goethite alpha -FeOOH; a neutron diffraction study AN - 1680752359; 2015-041013 AB - Goethite (alpha -FeOOH) is found in diverse natural ecosystems, it is by far the most common oxyhydroxide in terrestrial soils, sediments and clays and an important mineral in the biogeochemical cycle of iron at the Earth's surface. Neutron diffraction studies have found that the iron magnetic moments are collinear in a two sublattice antiferromagnetic structure, aligned parallel to the c axis in space group Pbnm (Forsyth et. al. 1968). However, goethite shows superparamagnetic behavior and also a weak ferromagnetic component that has been attributed to the presence of lattice distortions. It is thought that these changes in magnetic ordering could be due to a 13 degrees canting of the magnetic moment with respect to the c-axis, which enables the flipping of the spins due to small perturbations in the lattice (Coey et. al. 1995). In this study we used neutron diffraction at HIPPO and NPDF beamlines at LANSCE of Los Alamos National Laboratory on a powder of natural goethite provided by A. Gualtieri. The nuclear and magnetic structures were determined by means of a Rietveld refinement with GSAS and it was found that the spins of the iron atoms are aligned parallel to the c-axis, with no evidence of spin canting. The net magnetic moment is lower than what has previously been found. These results provide further insight into the magnetic ordering of this mineral and can be important in understanding the physical processes responsible for goethite's intriguing magnetic behavior. JF - American Geophysical Union Fall Meeting AU - Zepeda-Alarcon, Eloisa AU - Nakotte, H AU - Vogel, Sven C AU - Wenk, H AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract GP53B EP - 1135 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 01C:Mineralogy of non-silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680752359?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Validating+3D+seismic+velocity+models+using+the+spectral+element+method&rft.au=Larmat%2C+Carene+S%3BMaceira%2C+M%3BRowe%2C+C+A%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Larmat&rft.aufirst=Carene&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=280&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - Using high-temporal-resolution, repeat terrestrial LiDAR to compare topographic change detection methods and to elucidate the hydrometeorologic controls on the retreat rate and form of the Selawik retrogressive thaw slump, northwest Alaska AN - 1680750501; 2015-040773 AB - Retrogressive thaw slumps (RTS), a type of catastrophic thermokarst indicative of permafrost degradation, are forecast to increase in frequency and magnitude with a warming climate. RTS flux a disproportionate amount of sediment and nutrients to downstream ecosystems with the potential for adverse impacts. Characterizing the processes and hydrometeorologic drivers through which these features grow is necessary to better understand how these features may behave in the future. The Selawik RTS initiated in 2004 and has grown at a rate of 7-20 m/yr. In 2012, the feature was 200 m wide with a vertical headwall approximately 20 m high at its apex. We utilize a 58 scan repeat, ground based LiDAR data set collected over the summers of 2011 and 2012 and interval camera imagery to: (1) compare two topographic change detection methods, cloud to mesh (C2M) and the Multiscale Model to Model Cloud Comparison (M3C2) algorithm, (2) compare the error analysis techniques used with C2M and M3C2, (3) describe RTS mass loss processes, and (4) investigate the drivers of RTS retreat rate and form. We found that C2M reports higher magnitude topographic change over short time periods ( approximately 12 hours) and lower magnitude topographic change over long time periods ( approximately 20 days) when compared to M3C2. The spatially variable error analysis protocol used with M3C2 better accounts for the sources of uncertainty in point cloud data sets used for topographic change detection than C2M. TLS data from 2011 show a diel pattern in the mean retreat rate of the feature while data from 2012 show a more mixed signal. These differences are likely due to the warm, dry conditions experienced in 2011 verses the cool, wet conditions experienced in 2012. Statistical modeling indicates that RTS retreat rate and form are most sensitive to net radiation (R (super 2) 27.4%, pVal: 0.001 and R (super 2) 82.0%, pVal: <0.001, respectively). We interpret this to indicate that spallation-type mass loss processes, driven by elevated net radiation, are most effective at removing material from interstitial ice dominated RTS features. Furthermore, we find that hydrologic pathways in the tundra upslope of the feature control the cuspate form the Selawik RTS headwall. JF - American Geophysical Union Fall Meeting AU - Barnhart, Theodore B AU - Crosby, B T AU - Derryberry, D R AU - Rowland, J C AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract G33A EP - 0966 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680750501?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Using+high-temporal-resolution%2C+repeat+terrestrial+LiDAR+to+compare+topographic+change+detection+methods+and+to+elucidate+the+hydrometeorologic+controls+on+the+retreat+rate+and+form+of+the+Selawik+retrogressive+thaw+slump%2C+northwest+Alaska&rft.au=Barnhart%2C+Theodore+B%3BCrosby%2C+B+T%3BDerryberry%2C+D+R%3BRowland%2C+J+C%3BAnonymous&rft.aulast=Barnhart&rft.aufirst=Theodore&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 ER - TY - JOUR T1 - Structure of the lithosphere and asthenosphere beneath the western US from simultaneous multi-parameter inversion AN - 1676579020; 2015-037101 AB - Joint inversion of multiple datasets should produce more realistic images of Earth structure. Here we simultaneously invert surface wave dispersion, receiver functions, and gravity to determine structure of the crust and upper mantle of the western United States. Our target region is comprised of a one-degree grid that spans latitudes from 30 to 50 degrees North and longitudes from 95 to 125 degrees West. Receiver functions come from the Earthscope Automated Receiver system, and are stacked to produce an average model for each cell. Rayleigh and Love dispersion data come from multiple filter analysis of regional earthquakes, while the gravity observations are extracted from the EGM2008 model. Our starting model is comprised of an oceanic PREM model west of the Pacific coast, a western US model between that and the eastern front of the Rocky Mountains, and a continental PREM model east of the Rocky Mountain Front. Several different velocity/density relationships have been tested and all result in very similar models. Our inversion reduces RMS surface wave residuals by 58% and receiver function misfits by about 18%. Gravity residuals are reduced by more than 90%. While the reduction in residuals for receiver functions is not as profound as for surface waves or gravity, they are meaningful and produce sharper boundaries for the observed crustal anomalies. The addition of gravity produces subtle changes to the final model. Our final results are consistent with numerous previous studies in the region. In general, the craton exhibits higher velocities than the tectonically active regions to its west. We see high mid-crustal velocities under the Snake River Plain and the Colorado Plateau. In the lower crust we observe lowest velocities in the western Basin and Range and under the Colorado Mineral Belt. At 80km depth we see broad low velocities fanning out from the Snake River Plain associated with the mantle plume feeding Yellowstone Caldera. Additionally we see high and low velocity anomalies along the west coast that reflect ongoing subduction processes beneath the western US, including the subducting slab and slab window. JF - American Geophysical Union Fall Meeting AU - Steck, L AU - Maceira, M AU - Ammon, C J AU - Herrmann, R B AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S42C EP - 02 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1676579020?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Structure+of+the+lithosphere+and+asthenosphere+beneath+the+western+US+from+simultaneous+multi-parameter+inversion&rft.au=Steck%2C+L%3BMaceira%2C+M%3BAmmon%2C+C+J%3BHerrmann%2C+R+B%3BAnonymous&rft.aulast=Steck&rft.aufirst=L&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Seismic and geodetic observations of delayed dynamic triggering in Japan from the 11 April 2012 M8.6 east Indian Ocean earthquake AN - 1676578138; 2015-037096 AB - We examined two events off the east coast of Japan with magnitudes of 5.5 and 5.7 identified by Pollitz et al., [Nature, 2012] as part of a global fivefold increase in M > or =5.5 events for six days following the 11 April 2012 M 8.6 east Indian Ocean earthquake (IOE). These two events occurred approximately 30 and approximately 50 hours after the IOE and were located in the aftershock zone of the 11 March 2001 M 9.0 Tohoku-Oki earthquake (TOE). By examining the earthquake catalog and using high frequency coherence across nearby HINET borehole stations as a proxy for the rate of local seismic emission, we found an apparent migration of seismicity from north-northeast to south-southwest that encompassed both of the largest (M > or =5.5) events in the sequence as well as a few smaller clusters of seismicity that were activated or reactivated shortly after the IOE. Additionally, nearby GPS station indicated changes in the slip rate before, during, and after the IOE that was consistent with changes in seismicity and inter-event times. Dynamic perturbations produced by large earthquakes have been observed to trigger distant earthquakes both instantaneously and after delays of hours to days. In the case of instantaneous triggering the evidence usually consists of observations of the triggered event initiating during the passing of body or surface waves from the triggering event. In the case of delayed triggering the evidence usually consists of a statistically unusual rate of seismicity in a region that experiences high amplitude (>10-7) and long duration dynamic strains from the triggering event. The significant unanswered question is if an event that is part of a statistical anomaly is indeed triggered after a delay, what happens during the delay between the time of the dynamic perturbation and the triggered event? Earthquakes could be triggered directly through a cascading sequence or indirectly through a triggered slip event, changing pore pressures, or some other non-linear process in the fault zone initiated by the dynamic perturbation. The timing and distances of our observations suggest that the observed sequence of events are connected by an underlying non-linear process like a slow slip event on the plate interface rather than a cascading sequence of earthquakes. Some of our observations suggest that the dynamic perturbations produced by the IOE enhanced processes already underway due to the TOE. The after effects of the TOE heavily influenced this region and there was a considerable amount of after slip occurring in this region during the time of the IOE perhaps resulting in many patches on the brittle part of the fault being close to static failure. In addition to the IOE we also observe an instantaneous perturbation to the aftershock sequence of a M7 event near Okinawa by the 27 Feb 2010 M 8.8 Maule earthquake and we continue to look for evidence of remote dynamic triggering in Japan from other large events both inside and outside of aftershock regions. JF - American Geophysical Union Fall Meeting AU - Delorey, A A AU - Johnson, P A AU - Chao, K AU - Obara, K AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S42B EP - 05 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1676578138?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Seismic+and+geodetic+observations+of+delayed+dynamic+triggering+in+Japan+from+the+11+April+2012+M8.6+east+Indian+Ocean+earthquake&rft.au=Delorey%2C+A+A%3BJohnson%2C+P+A%3BChao%2C+K%3BObara%2C+K%3BAnonymous&rft.aulast=Delorey&rft.aufirst=A&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Acceleration of acoustical emission precursors preceding failure in sheared granular material AN - 1676577752; 2015-037098 AB - Earthquake precursor observations are becoming progressively more widespread as instrumentation improves, in particular for interplate earthquakes (e.g., Bouchon et al., Nature Geoscience, 2013). One question regarding precursor behavior is whether or not they are due to a triggering cascade where one precursor triggers the next, or if they are independent events resulting from slow slip. We investigate this topic in order to characterize the physics of precursors, by applying laboratory experiments of sheared granular media in a bi-axial configuration. We sheared layers of glass beads under applied normal loads of 2-8 MPa, shearing rates of 5-10 mu m/s at room temperature and humidity. We show that above approximately 3 MPa load, precursors are manifest by an exponential increase in time of the acoustic emission (AE), with an additional acceleration of event rate leading to the primary stick-slip failure event. The recorded AE are clearly correlated with small drops in shear stress during slow slip prior to the main stick-slip failure. Event precursors take place where the material is still modestly dilating, yet while the macroscopic frictional strength is no longer increasing. The precursors are of order 100x smaller in recorded strain amplitude than the stick-slip events. We are currently working on statistical methods to determine whether or not the precursors are triggered cascades. JF - American Geophysical Union Fall Meeting AU - Johnson, P A AU - Kaproth, B M AU - Scuderi, M AU - Ferdowsi, B AU - Griffa, M AU - Carmeliet, J AU - Guyer, R A AU - Le Bas, P AU - Trugman, D AU - Ben Naim, E AU - Daub, E G AU - Marone, C AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S42B EP - 07 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1676577752?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Acceleration+of+acoustical+emission+precursors+preceding+failure+in+sheared+granular+material&rft.au=Johnson%2C+P+A%3BKaproth%2C+B+M%3BScuderi%2C+M%3BFerdowsi%2C+B%3BGriffa%2C+M%3BCarmeliet%2C+J%3BGuyer%2C+R+A%3BLe+Bas%2C+P%3BTrugman%2C+D%3BBen+Naim%2C+E%3BDaub%2C+E+G%3BMarone%2C+C%3BAnonymous&rft.aulast=Johnson&rft.aufirst=P&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Evidence for a nascent rift in south Sudan; westward extension of the East African Rift system? AN - 1668232213; 2015-031117 AB - Joint inversion of seismic and gravity data of eastern Africa reveals a low seismic wave velocity arm stretching from the southern Main Ethiopian rift westward in an east-west direction that has not been noticed in earlier work. The zone of low velocities is located in the upper mantle and is not overlain by a known structural rift expression. We analyzed the local pattern of seismicity and the stresses in the African Plate to interpret this low velocity arm. The zone of low velocities is located within the Central African Fold Belt, which dissects the northern and southern portions of the African continent. It is seismically active with small to intermediate sized earthquakes occurring in the crust. Seven earthquake solutions indicate (oblique) normal faulting and low-angle normal faulting with a NS to NNW-SSE opening direction, as well as strike-slip faulting. This pattern of deformation is typically associated with rifting. The present day stress field in northeastern Africa reveals a tensional state of stress at the location of the low velocity arm with an opening direction that corresponds to the earthquake data. We propose that the South Sudan low velocity zone and seismic center are part of an undeveloped, nascent rift arm. The arm stretches from the East African Rift system westward. JF - American Geophysical Union Fall Meeting AU - Maceira, M AU - Van Wijk, J W AU - Coblentz, D D AU - Modrak, R T AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract T11F EP - 07 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668232213?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Evidence+for+a+nascent+rift+in+south+Sudan%3B+westward+extension+of+the+East+African+Rift+system%3F&rft.au=Maceira%2C+M%3BVan+Wijk%2C+J+W%3BCoblentz%2C+D+D%3BModrak%2C+R+T%3BAnonymous&rft.aulast=Maceira&rft.aufirst=M&rft.date=2013-12-01&rft.volume=29&rft.issue=3&rft.spage=245&rft.isbn=&rft.btitle=&rft.title=Nature+Biotechnology&rft.issn=10870156&rft_id=info:doi/10.1038%2Fnbt.1791 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Computational advances in the Arctic Terrestrial Simulator; modeling permafrost degradation in a warming Arctic AN - 1668232037; 2015-030897 AB - The terrestrial Arctic has been a net sink of carbon for thousands of years, but warming trends suggest this may change. As the terrestrial Arctic warms, degradation of the permafrost results in significant melting of the ice wedges that support low-centered polygonal ground. This leads to subsidence of the topography, inversion of the polygonal ground, and restructuring of drainage networks. The change in hydrology and vegetation that result from these processes is poorly understood. Predictive simulation of the fate of this carbon is critical for understanding feedback effects between the terrestrial Arctic and climate change. Simulation of this system at fine scales presents many challenges. Flow and energy equations are solved on both the surface and subsurface domains, and deformation of the soil subsurface must couple with both. Additional processes such as snow, evapo-transpiration, and biogeochemistry supplement this THMC model. While globally implicit coupling methods enable conservation of mass and energy on the combined domain, care must be taken to ensure conservation as the soil subsides and the mesh deforms. Uncertainty in both critical physics of each process model and in coupling to maintain accuracy between processes suggests the need for a versatile many-physics framework. This framework should allow swapping of both processes and constitutive relations, and enable easy numerical experimentation of coupling strategies. Deformation dictates the need for advanced discretizations which maintain accuracy and a mesh framework capable of calculating smooth deformation with remapped fields. And latent heat introduces strong nonlinearities, requiring robust solvers and an efficient globalization strategy. Here we discuss advances as implemented in the Arctic Terrestrial Simulator (ATS), a many-physics framework and collection of physics kernels based upon Amanzi. We demonstrate the deformation capability, conserving mass and energy while simulating soil subsidence due to bulk ice melting. Mimetic finite difference methods are used to maintain accuracy during mesh deformation. Globalization strategies similar to a local change of variables greatly extend the timestep size without requiring additional residual evaluations. Finally, ATS leverages tree structures for process kernels and data dependencies, enabling versatile combinations of processes and constitutive models and dynamic experimentation with coupling strategies. These advances are demonstrated in a series of problems coupling the thermal-mechanical-hydrological core of the ATS. This work was supported by LANL Laboratory Directed Research and Development Project LDRD201200068DR. JF - American Geophysical Union Fall Meeting AU - Coon, E AU - Berndt, M AU - Garimella, R AU - Moulton, J D AU - Manzini, G AU - Painter, S L AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract DI31A EP - 2195 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668232037?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Computational+advances+in+the+Arctic+Terrestrial+Simulator%3B+modeling+permafrost+degradation+in+a+warming+Arctic&rft.au=Coon%2C+E%3BBerndt%2C+M%3BGarimella%2C+R%3BMoulton%2C+J+D%3BManzini%2C+G%3BPainter%2C+S+L%3BAnonymous&rft.aulast=Coon&rft.aufirst=E&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Climate warming increases Greenland ice sheet surface mass balance variability AN - 1668231290; 2015-027579 AB - We analyze Greenland Ice Sheet (GIS) surface mass balance (SMB) trends generated by the Community Earth System Model for the time period 1850-2100. In addition to the expected decrease in the mean SMB, our analysis reveals a significant secular increase in temporal, integrated SMB variability. The largest variability increase occurs during the 21st century, and arises primarily from growth of the GIS ablation zone (i.e., a decrease in the accumulation area ratio, AAR) in conjunction with a high ratio of ablation-zone to accumulation-zone specific SMB variability. A secondary cause of the overall variability increase is a rise in specific SMB variability itself in both the accumulation and ablation zones, due to increased accumulation variability and lengthened melt seasons. Simple sensitivity experiments indicate that neither mechanism (decrease in the AAR, and increased specific SMB variability) in isolation is capable of causing the overall increase in integrated SMB variability. However, by exposing more of the ice sheet to high-variability ablation, the decrease in the AAR is about twice as effective as increased specific SMB variability in causing the overall variability increase. Ablation-zone SMB variability is driven largely by variability in summertime melting which is in turn regulated by variability in summertime surface energy fluxes. Broader climate processes that regulate these fluxes will therefore exert increasing control on GIS SMB variability in the future. This future increase in SMB variability can be expected to impact GIS-sourced freshwater fluxes and GIS ice dynamic variability, and may also make it more difficult to diagnose future secular trends in GIS volume. JF - American Geophysical Union Fall Meeting AU - Fyke, J G AU - Vizcaino, M AU - Lipscomb, W H AU - Sacks, W AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C31C EP - 02 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668231290?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Climate+warming+increases+Greenland+ice+sheet+surface+mass+balance+variability&rft.au=Fyke%2C+J+G%3BVizcaino%2C+M%3BLipscomb%2C+W+H%3BSacks%2C+W%3BAnonymous&rft.aulast=Fyke&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Spatial-temporal variation of low-frequency earthquake bursts near Parkfield, CA AN - 1668230770; 2015-027678 AB - Non-volcanic Tremor (NVT) and Low-frequency earthquakes (LFE) are found in the deeper crust of various tectonic environments globally in the last decade. The spatial-temporal behavior of LFEs could provide crucial insight into the deep fault zone processes that may lead to future large earthquakes. In this study, we examine recurrence times from a 12-yr catalog of 88 LFE families with approximately 730,000 LFEs in the vicinity of the Parkfield section of the San Andreas Fault (SAF) in central California. We apply an automatic burst detection algorithm to the LFE recurrence times to identify the LFE bursts in each family. We find similar temporal patterns of LFE bursts within a group of LFE families to the northwest of Parkfield, and within a group of LFE families to the southeast of Parkfield, respectively. However, the burst behaviors in the northwestern and southeastern groups are quite different. Generally the northwestern group has longer burst duration, and the southeastern group has shorter burst duration but more LFEs within the bursts. The difference in the LFE burst patterns across the Parkfield section of SAF could possibly be explained by the different slip behaviors beneath the creeping and locked sections of SAF. We also found that the 2004 Parkfield earthquake clearly shortened the recurrence time of LFE bursts for both the northwestern and southeastern groups, with a relatively larger effect on the northwestern group, which could be due to the northwestern rupture direction of the earthquake. Our on-going work includes better constraining and understanding the physical mechanisms for the difference between the northwestern and southeastern LFE families and the temporal changes in the LFE burst patterns caused by the Parkfield earthquake. JF - American Geophysical Union Fall Meeting AU - Wu, C AU - Shelly, D R AU - Guyer, R A AU - Frank, W AU - Gomberg, J S AU - Johnson, P A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S41B EP - 2454 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668230770?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Spatial-temporal+variation+of+low-frequency+earthquake+bursts+near+Parkfield%2C+CA&rft.au=Wu%2C+C%3BShelly%2C+D+R%3BGuyer%2C+R+A%3BFrank%2C+W%3BGomberg%2C+J+S%3BJohnson%2C+P+A%3BAnonymous&rft.aulast=Wu&rft.aufirst=C&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Burst, background, and triggered low-frequency earthquakes and non-volcanic tremors AN - 1668230334; 2015-027712 AB - Since the first observations of slow-slip events (SSEs), non-volcanic tremor (NVT), and low-frequency earthquakes (LFEs), strong links have been identified between the three slow earthquake phenomena, such as increased NVT and LFE activity during large SSEs and the burst-like, or episodic, behavior of both NVT and LFEs. We focus here on the latter observation, exploring this distinct characteristic of LFEs and NVT. Analysis of the LFE and NVT catalogs from Guerrero, Mexico and Parkfield, California reveals a steady background event rate underlying a non-periodic burst-like behavior. We develop a simple algorithm to generate a catalog of bursts for both LFEs and NVTs, separating the events that occur within bursts from the background rate. We observe that just as LFEs and NVTs occur on two different time scales (from seconds to minutes or hours), their bursts occur on similarly different time scales (from minutes or hours to days). Using these decomposed background and burst event rates, we then attempt to model different potential triggering mechanisms such as slow-slip events with a brittle ductile friction model (Daub et al. [2011]) that could potentially reproduce the observed behavior. JF - American Geophysical Union Fall Meeting AU - Shapiro, N AU - Frank, W AU - Kostoglodov, V AU - Husker, A L AU - Daub, E G AU - Radiguet, M AU - Wu, C AU - Guyer, R A AU - Nadeau, R M AU - Campillo, M AU - Payero, J S AU - Prieto, G A AU - Shelly, D R AU - Johnson, P A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S51B EP - 2347 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668230334?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Burst%2C+background%2C+and+triggered+low-frequency+earthquakes+and+non-volcanic+tremors&rft.au=Shapiro%2C+N%3BFrank%2C+W%3BKostoglodov%2C+V%3BHusker%2C+A+L%3BDaub%2C+E+G%3BRadiguet%2C+M%3BWu%2C+C%3BGuyer%2C+R+A%3BNadeau%2C+R+M%3BCampillo%2C+M%3BPayero%2C+J+S%3BPrieto%2C+G+A%3BShelly%2C+D+R%3BJohnson%2C+P+A%3BAnonymous&rft.aulast=Shapiro&rft.aufirst=N&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Surface-wave attenuation from ambient seismic noise recorded by the USArray AN - 1668230057; 2015-027794 AB - Recent work both on observed data and in numerical simulations has proved the possibility to retrieve meaningful Green's function amplitudes, in addition to arrival times, from ambient noise correlations. This allows for tomographic inversion of surface-wave attenuation using dense seismic arrays. Our research has shown that the correlation of the coda of correlation (C3) provides a more reliable attenuation estimate. In this study, we apply the C3 method to measure correlation amplitudes, which can be modeled by medium attenuation, site amplification, and noise-source intensity. We then adopt a Bayesian approach to conduct a high-resolution surface-wave attenuation tomography using ambient seismic noise recorded by the USArray. We focus our analysis on 18 s and 8 s respectively (the primary and secondary microseisms). Using 352 stations deployed in 2007 and 2008, we first construct a model for the Western U.S. with a grid size of 1-by-1 degrees. The region is covered by a total of 5734 ray paths. Our result shows certain degrees of correlation between the noise-based attenuation map and the regional geology, particularly in Yellowstone and Colorado Plateau regions. In addition, we are collecting more recent USArray data from 2012 onward to invert for an attenuation map for the Eastern U.S. JF - American Geophysical Union Fall Meeting AU - Zhang, J AU - Yang, X AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S52B EP - 08 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668230057?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Surface-wave+attenuation+from+ambient+seismic+noise+recorded+by+the+USArray&rft.au=Zhang%2C+J%3BYang%2C+X%3BAnonymous&rft.aulast=Zhang&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Spatial and spectral characterization, mapping, and 3D reconstructing of ice-wedge polygons using high resolution LiDAR data AN - 1668228639; 2015-027498 AB - In landscapes with ice-wedge polygons, fine-scale land surface characterization is critically important because the processes that govern the carbon cycle and hydrological dynamics are controlled by features on the order of a few to tens of meters. To characterize the fine-scale features in polygonal ground in Barrow, Alaska, we use high-resolution LiDAR-derived topographic data (such as elevation, slope, curvature, and a novel "directed distance (DD)" to develop quantitative metrics that allow for the discretization and characterization of polygons (formed by seasonal freeze and thaw processes). First, we used high resolution (0.25 m) LiDAR to show that the high and low centered polygon features exhibit a unique signature in the Fourier power spectrum where the landscape signature on freeze and thaw process ( approximately 5 to 100 m) is super imposed on the coarse scale fluvial eroded landscape (rudimentary river network) signature. We next convolve LiDAR elevations with multiscale wavelets and objectively choose appropriate scales to map interconnected troughs of high- and low-centered polygons. For the ice wedges where LiDAR surface expressions (troughs) are not well developed, we used a Delaunay triangulation to connect the ice-wedge network and map the topologically connected polygons. This analysis allows us to explore the 3D morphometry of these high- and low-centered polygons and develop a supervised set of ensemble characteristic templates for each polygon type as a function of directed distance (DD). These templates are used to classify the ice-wedge polygon landscape into low-centered polygons with limited troughs, and high- and low-centered polygons with well-developed trough network. We further extend the characteristic templates to polygon ensemble slopes and curvatures as a function of DD and develop a classification scheme for microtopographic features including troughs, rims, elevated ridges, and centers for both high-centered and low-centered polygon. Finally, we show that the developed topographic template curves can be used to synthetically generate 3D model domain polygonal discretizations and characterizations and to predict ice wedge degradation levels--all using commonly available high resolution remotely sensed data where high-resolution LiDAR data is unavailable. JF - American Geophysical Union Fall Meeting AU - Gangodagamage, C AU - Rowland, J C AU - Skurikhin, A N AU - Wilson, C J AU - Brumby, S P AU - Painter, S L AU - Gable, C W AU - Bui, Q AU - Short, L S AU - Liljedahl, A AU - Hubbard, S S AU - Wainwright, H M AU - Dafflon, B AU - Tweedie, C E AU - Kumar, J AU - Wullschleger, S D AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract B51H EP - 0402 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668228639?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Spatial+and+spectral+characterization%2C+mapping%2C+and+3D+reconstructing+of+ice-wedge+polygons+using+high+resolution+LiDAR+data&rft.au=Gangodagamage%2C+C%3BRowland%2C+J+C%3BSkurikhin%2C+A+N%3BWilson%2C+C+J%3BBrumby%2C+S+P%3BPainter%2C+S+L%3BGable%2C+C+W%3BBui%2C+Q%3BShort%2C+L+S%3BLiljedahl%2C+A%3BHubbard%2C+S+S%3BWainwright%2C+H+M%3BDafflon%2C+B%3BTweedie%2C+C+E%3BKumar%2C+J%3BWullschleger%2C+S+D%3BAnonymous&rft.aulast=Gangodagamage&rft.aufirst=C&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Texture and anisotropy analysis of a laminated lower crust; a neutron diffraction study of felsic granulites AN - 1668228367; 2015-027847 AB - Quantitative fabric analyses of high-P and high-T tectonites were done with HIPPO, a Time-Of-Flight (TOF) neutron diffractometer at Los Alamos National Lab. Samples were collected in the Sobrado unit (NW Spain), a tectonic stack of highly deformed slices of metabasites, paragneisses and ultramafic rocks. Metamorphism ranges from granulites on top, to eclogites at the bottom of the unit. The ensemble represents and excellent example of laminated lower crust. The alternation of mechanically contrasted lithologies and/or the development of crystal preferred orientation might result into anisotropy. We explore the contribution of crystallographic preferred orientation or texture to the seismic anisotropy of the lower crust. Since strain partitioning occurred between mechanically strong and weak lithologies, a higher crystal preferred orientation is expected along the weak levels: the metasediments. TOF neutron diffraction experiments were conducted in HIPPO (LANSCE) with high-P and high-T mylonitic felsic paragneisses. Quantitative texture analysis of neutron data was accomplished by using the Rietveld method, with E-WIMW algorithm, implemented in the program package MAUD (Material Analysis Using Diffraction; Lutterotti, 1999). The orientation distribution function (ODF) for each mineral was calculated in MAUD and then processed in BEARTEX (Wenk et al. 1998). Selected pole figures were plotted for major components, quartz, plagioclase and biotite (first setting in monoclinic crystals). Texture patterns are compatible with non-coaxial progressive deformation and discussed accordingly in terms of dislocation activity. Besides, seismic waves velocities were computed from the texture data in BEARTEX. Calculated velocities and anisotropy were based on ODF, volume fraction of each mineral and their single-crystal elastic constant. Kinematic and mechanical implications are discussed in terms of the regional geology. The correlation of texture, mineral composition and seismic anisotropy in the model is also presented. JF - American Geophysical Union Fall Meeting AU - Benitez Perez, Joseba AU - Gomez Barreiro, J AU - Martinez-Catalan, J R AU - Castineiras Garcia, P AU - Vogel, Sven C AU - Wenk, H AU - Alvarez Valero, A AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract T53B EP - 2585 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668228367?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Texture+and+anisotropy+analysis+of+a+laminated+lower+crust%3B+a+neutron+diffraction+study+of+felsic+granulites&rft.au=Benitez+Perez%2C+Joseba%3BGomez+Barreiro%2C+J%3BMartinez-Catalan%2C+J+R%3BCastineiras+Garcia%2C+P%3BVogel%2C+Sven+C%3BWenk%2C+H%3BAlvarez+Valero%2C+A%3BAnonymous&rft.aulast=Benitez+Perez&rft.aufirst=Joseba&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geology+%28Boulder%29&rft.issn=00917613&rft_id=info:doi/10.1130%2FG31557.1 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Linking material properties and microstructures to characterize damage associated with an underground explosion in granite AN - 1664436114; 2015-023154 AB - The Source Physics Experiment, conducted in granite in Nevada, is a series of explosive tests designed to study the generation and propagation of seismic waves. Extensive seismic monitoring and site rock characterization are being used to improve the predictive capability of models for detecting and characterizing underground explosions. Site rock characterization includes geomechanical and material properties testing, core-scale fracture identification, and optical microscopy studies. Geomechanical and material properties determined via laboratory testing of the site rocks include unconfined compressive strength, Young's modulus, Poisson's ratio, and bulk density. Detailed fracture mapping and characterization of meso- and micro-scale fractures in recovered cores are being conducted and include mineralization changes and the extent of crushed or fractured zone away from the source. We report on the analysis of microfractures in these cores, which provide a detailed and quantitative dataset on the extent and nature of damage in the recovered cores. Microfracture density and character (open, sealed, healed) are recorded in order to differentiate sets of microfractures associated with explosive tests. Densities (mf/mm) of open microfractures correlate with source-related damage, and increase from pre- to post-test samples. Microfracture densities are affected by pre-existing fractures, depending on fracture-zone mineralogy and alteration. These microfracture density data, linked to the bulk material properties, geomechanical properties, and the structural features of the rock at the core-scale, define a damage zone surrounding the source at depth. This link is essential to understanding how the bulk material properties manifest themselves in the rock and how that might affect energy propagation. Work by Los Alamos National Laboratory was sponsored by the National Nuclear Security Administration Award No. DE-AC52-06NA25946/NST10-NCNS-PD00. Work by National Security Technologies, LLC, was performed under Contract No. DE AC52 06NA25946 with the U.S. Department of Energy. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. LA-UR-13-26203. JF - American Geophysical Union Fall Meeting AU - Wilson, J E AU - Broome, S AU - Sussman, A J AU - Townsend, M AU - Schultz-Fellenz, E S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S33B EP - 2421 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664436114?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Linking+material+properties+and+microstructures+to+characterize+damage+associated+with+an+underground+explosion+in+granite&rft.au=Wilson%2C+J+E%3BBroome%2C+S%3BSussman%2C+A+J%3BTownsend%2C+M%3BSchultz-Fellenz%2C+E+S%3BAnonymous&rft.aulast=Wilson&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Isotopic and geochemical signatures of different aged drained thaw lake basins (DTLBs) and drainage channels in Arctic Alaska AN - 1664435324; 2015-025238 AB - The Arctic tundra contains a vast amount of C stored in permafrost soils, which are highly susceptible to thawing with climate change. Permafrost degradation has implications for land-atmosphere feedbacks through the release of stored C as greenhouse gases (CO (sub 2) , methane), and runoff of dissolved C. Coastal Arctic topography and geomorphology in particular is highly complex, consisting of irregular polygonal ground features, drainage channel networks, and different aged drained thaw lake basins (DTLBs). Such substantial spatial variability complicates predictions of permafrost degradation with regard to land-atmosphere feedbacks affecting climate and regional ecosystem responses. The DOE Office of Science Biological and Environmental Research Program has funded the Next Generation Ecosystem Experiment (NGEE) Arctic project to assess the release of greenhouse gases from melting Arctic permafrost, with emphasis on regional geomorphology; and to establish a coordinated effort among several research institutions to link field observations with process-based Land models. Results will focus on geochemical and isotopic signatures of waters collected at different depths (surface; from the shallow organic layer; and from the deeper frost table) in Barrow, Alaska in July and September of 2013. Sampling sites were stationed across distinct microtopographic features, including polygonal terrain, different aged DTLBs, and larger drainage channels. The aims of these field campaigns were to assess geochemical and biogeochemical trends and isotopic variability in waters across unique micro-topographic features and with depth, and infer vertical and lateral flows of water and C by collecting field data to validate large-scale regional models. Preliminary results showed some differences with depth and across unique micro-topographic features. Redox indicators (Fe (super 2+) and dissolved oxygen) showed greater reducing conditions with depth, as was expected. In particular, subsurface waters associated with large drainage channels had highly reducing conditions, relative to less distinct, smaller internal drainages. Dissolved inorganic carbon (DIC) concentrations ranged from 0-734 ppm HCO (sub 3) (super -) , and exhibited a trend of greater concentration with depth for nearly all sites. The (super 13) C DIC isotope signature ranged widely, from -2.2 to -25.1, with the lightest values at the shallow subsurface depth for all sites relative to the surface and deeper subsurface. Additional results will discuss concentrations and isotope signatures of dissolved CH4 (C13 and H2) and organic C at the selected sites; as well as geochemistry (anions and metals). JF - American Geophysical Union Fall Meeting AU - Throckmorton, H AU - Perkins, G AU - Rearick, M AU - Altmann, G L AU - Cohen, Lily R AU - Hudak, M AU - Gard, M AU - Newman, B D AU - Heikoop, J M AU - Wilson, C J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract B11C EP - 0388 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664435324?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Isotopic+and+geochemical+signatures+of+different+aged+drained+thaw+lake+basins+%28DTLBs%29+and+drainage+channels+in+Arctic+Alaska&rft.au=Throckmorton%2C+H%3BPerkins%2C+G%3BRearick%2C+M%3BAltmann%2C+G+L%3BCohen%2C+Lily+R%3BHudak%2C+M%3BGard%2C+M%3BNewman%2C+B+D%3BHeikoop%2C+J+M%3BWilson%2C+C+J%3BAnonymous&rft.aulast=Lucas&rft.aufirst=Marcel&rft.date=2011-03-01&rft.volume=102&rft.issue=6&rft.spage=4518&rft.isbn=&rft.btitle=&rft.title=Bioresource+Technology&rft.issn=09608524&rft_id=info:doi/10.1016%2Fj.biortech.2010.12.087 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Hydrodynamic modeling of free surface interactions and implications for P and rg waves recorded on the source physics experiments AN - 1664434522; 2015-023156 AB - A goal of the Source Physics Experiments (SPE) is to develop explosion source models expanding monitoring capabilities beyond empirical methods. The SPE project combines field experimentation with numerical modelling. The models take into account non-linear processes occurring from the first moment of the explosion as well as complex linear propagation effects of signals reaching far-field recording stations. The hydrodynamic code CASH is used for modelling high-strain rate, non-linear response occurring in the material near the source. Our development efforts focused on incorporating in-situ stress and fracture processes. CASH simulates the material response from the near-source, strong shock zone out to the small-strain and ultimately the elastic regime where a linear code can take over. We developed an interface with the Spectral Element Method code, SPECFEM3D, that is an efficient implementation on parallel computers of a high-order finite element method. SPECFEM3D allows accurate modelling of wave propagation to remote monitoring distance at low cost. We will present CASH-SPECFEM3D results for SPE1, which was a chemical detonation of about 85 kg of TNT at 55 m depth in a granitic geologic unit. Spallation was observed for SPE1. Keeping yield fixed we vary the depth of the source systematically and compute synthetic seismograms to distances where the P and Rg waves are separated, so that analysis can be performed without concern about interference effects due to overlapping energy. We study the time and frequency characteristics of P and Rg waves and analyse them in regard to the impact of free-surface interactions and rock damage resulting from those interactions. We also perform traditional CMT inversions as well as advanced CMT inversions, developed at LANL to take into account the damage. This will allow us to assess the effect of spallation on CMT solutions as well as to validate our inversion procedure. Further work will aim to validate the developed models with the data recorded on SPEs. This long-term goal requires taking into account the 3D structure and thus a comprehensive characterization of the site. JF - American Geophysical Union Fall Meeting AU - Larmat, C S AU - Rougier, E AU - Knight, E AU - Yang, X AU - Patton, H J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S33B EP - 2423 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664434522?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Hydrodynamic+modeling+of+free+surface+interactions+and+implications+for+P+and+rg+waves+recorded+on+the+source+physics+experiments&rft.au=Larmat%2C+C+S%3BRougier%2C+E%3BKnight%2C+E%3BYang%2C+X%3BPatton%2C+H+J%3BAnonymous&rft.aulast=Larmat&rft.aufirst=C&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Modeling the infrasound acoustic signal generation of underground explosions at the source physics experiment AN - 1664434469; 2015-023159 AB - One of the primary goals of the Source Physics Experiment is to improve upon and develop new physics based models for underground nuclear explosions using scaled, underground chemical explosions as proxies. Jones et. al, (AGU 2012) previously presented results describing the use of the Rayleigh integral (RI) to model the source region of the SPE explosions. While these results showed that the source region could be modeled using the RI, there were some complexities in the produced, synthetic waveforms that were unaccounted for when compared to the observed data. To gain insight into these complexities and to verify the results of the RI method, we used CAVEAT, a two-dimensional computational fluid dynamics, time-domain finite-difference code developed at Los Alamos National Labs (LANL). CAVEAT has been used in the solution of high speed and low speed fluid problems. While the RI uses the observed acceleration records from the 12 vertical surface accelerometers installed above ground zero, CAVEAT employs a synthetic source-time function, based on the acceleration records, that varies with range and time. This model provides a velocity boundary condition at the bottom boundary of the CAVEAT computation mesh that drives the atmospheric pressure wave into the atmosphere. JF - American Geophysical Union Fall Meeting AU - Whitaker, R W AU - Jones, K R AU - Arrowsmith, S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S33B EP - 2426 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664434469?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Modeling+the+infrasound+acoustic+signal+generation+of+underground+explosions+at+the+source+physics+experiment&rft.au=Whitaker%2C+R+W%3BJones%2C+K+R%3BArrowsmith%2C+S%3BAnonymous&rft.aulast=Whitaker&rft.aufirst=R&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Assessing natural attenuation potential at a uranium (U) in situ recovery site (Rosita, TX, USA) using multiple redox-sensitive isotope systems AN - 1664434431; 2015-023221 AB - The In Situ Recovery (ISR) U mining operation at Rosita, TX, USA, involved oxidative dissolution of U from roll front U deposits. This process mobilized U along with other characteristic elements (e.g., Se) from the roll fronts in their soluble and toxic oxidized forms (e.g., U(VI), Se(VI)). The dissolved U(VI) in groundwater poses significant ecological risk due to its chemical toxicity and must be restored below the existing regulatory limit to minimize the environmental impact of ISR mining. However, the undisturbed sediments downgradient to the roll front deposits are expected to remain reduced. Naturally occurring Fe-minerals (e.g., FeS, siderite, magnetite) and microorganisms in the sediments downgradient to ISR activity can reduce dissolved U(VI) to less toxic and insoluble U(IV) and promote natural attenuation. The reduction of oxyanions of U or Se induces measurable isotopic fractionation that can be used to monitor the natural attenuation by downgradient sediments. Here, we used multiple redox-sensitive isotope systems (U, Se, and S) to detect reducing conditions and natural attenuation of U(VI) at the ISR site. We collected groundwater samples from 26 wells located in the ore body, upgradient and downgradient to the ore body. The delta (super 238) U values measured in groundwater samples from 23 wells range from 0.48 ppm to -1.66 ppm (+ or -0.12 ppm). A preliminary investigation of 6 groundwater samples shows a variation of delta (super 82) Se values from -1.44 ppm to 5.24 ppm (+ or -0.15 ppm). The delta (super 34) SO (sub 4) measurements in groundwater vary from 11.8 ppm to -19.9 ppm. The reduction of Se(VI) and SO (sub 4) (super 2-) fractionates the lighter isotopes (i.e., (super 32) S and (super 76) Se) in the reduced product phase rendering the remaining reactants in the groundwater enriched in heavier isotopes. Therefore, the high delta (super 82) Se and delta (super 34) SO (sub 4) values may suggest reduction of Se(VI) and SO (sub 4) (super 2-) , respectively. The highest delta (super 238) U values are observed in the wells located in the ore body or upgradient to the ore body whereas the downgradient wells show significantly lower delta (super 238) U values. High delta (super 238) U values in most of the wells located in the ore-zone may be attributed to the dissolution of the U ore enriched in (super 238) U. The low delta (super 238) U values are generally observed in the wells with low U(VI) concentrations. Since U(VI) reduction fractionates (super 238) U to the solid U(IV) phase, the depletion of (super 238) U in the groundwater samples in the downgradient monitoring wells suggest U(VI) reduction by the downgradient sediments. The delta (super 238) U values in the groundwater samples conform to a Rayleigh distillation model with an isotopic fractionation factor alpha = 1.00013 + or - 0.00010. Future investigations include characterization of the U ore bearing sediments collected from boreholes in the ore body and downgradient of the ore body, measurement of the delta (super 238) U and delta (super 82) Se values in the ore and in remaining groundwater samples. The U(VI) reducing capacity and concomitant U isotopic fractionation factors for the sediments from downgradient boreholes will be determined from the batch incubation experiments and flow through column experiments. JF - American Geophysical Union Fall Meeting AU - Basu, Anirban AU - Brown, S T AU - Christensen, J N AU - DePaolo, Donald J AU - Reimus, P W AU - Heikoop, J M AU - Simmons, A M AU - House, B AU - Schilling, K AU - Johnson, T M AU - Pelizza, M AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract V54A EP - 04 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664434431?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Assessing+natural+attenuation+potential+at+a+uranium+%28U%29+in+situ+recovery+site+%28Rosita%2C+TX%2C+USA%29+using+multiple+redox-sensitive+isotope+systems&rft.au=Basu%2C+Anirban%3BBrown%2C+S+T%3BChristensen%2C+J+N%3BDePaolo%2C+Donald+J%3BReimus%2C+P+W%3BHeikoop%2C+J+M%3BSimmons%2C+A+M%3BHouse%2C+B%3BSchilling%2C+K%3BJohnson%2C+T+M%3BPelizza%2C+M%3BAnonymous&rft.aulast=Basu&rft.aufirst=Anirban&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Evaluation of mapping methodologies at a legacy test site AN - 1664434341; 2015-023150 AB - On June 12th, 1985, a nuclear test with an announced yield between 20-150kt was detonated in rhyolitic lava in a vertical emplacement borehole at a depth of 608m below the surface. This test did not collapse to the surface and form a crater, but rather resulted in a subsurface collapse with more subtle surface expressions of deformation, providing an opportunity to evaluate the site using a number of surface mapping methodologies. The site was investigated over a two-year time span by several mapping teams. In order to determine the most time efficient and accurate approach for mapping post-shot surface features at a legacy test site, a number of different techniques were employed. The site was initially divided into four quarters, with teams applying various methodologies, techniques, and instrumentations to each quarter. Early methods included transect lines and site gridding with a Brunton pocket transit, flagging tape, measuring tape, and stakes; surveying using a hand-held personal GPS to locate observed features with an accuracy of + or - 5-10m; and extensive photo-documentation. More recent methods have incorporated the use of near survey grade GPS devices to allow careful location and mapping of surface features. Initially, gridding was employed along with the high resolution GPS surveys, but this was found to be time consuming and of little observational value. Raw visual observation (VOB) data included GPS coordinates for artifacts or features of interest, field notes, and photographs. A categorization system was used to organize the myriad of items, in order to aid in database searches and for visual presentation of findings. The collected data set was imported into a geographic information system (GIS) as points, lines, or polygons and overlain onto a digital color orthophoto map of the test site. Once these data were mapped, spectral data were collected using a high resolution field spectrometer. In addition to geo-locating the field observations with 10cm resolution GPS, LiDAR and hyperspectral imagery were also acquired. The LiDAR and hyperspectral data are being processed and will be added to the existing geo-referenced database as separate information layers for remote sensing analysis of surface features associated with the legacy test. By consolidating the various components of a VOB data point (coordinates, photo and item description) into a standalone database, searching or querying for other components or collects such as subsurface geophysical and/or airborne imagery is made much easier. JF - American Geophysical Union Fall Meeting AU - Sussman, A J AU - Schultz-Fellenz, E S AU - Roback, R C AU - Kelley, R E AU - Drellack, S AU - Reed, D AU - Miller, E AU - Cooper, D I AU - Sandoval, M AU - Wang, R AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S33B EP - 2417 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664434341?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Evaluation+of+mapping+methodologies+at+a+legacy+test+site&rft.au=Sussman%2C+A+J%3BSchultz-Fellenz%2C+E+S%3BRoback%2C+R+C%3BKelley%2C+R+E%3BDrellack%2C+S%3BReed%2C+D%3BMiller%2C+E%3BCooper%2C+D+I%3BSandoval%2C+M%3BWang%2C+R%3BAnonymous&rft.aulast=Sussman&rft.aufirst=A&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Constructing a starting 3D shear velocity model with sharp interfaces for SEM-based upper mantle tomography in North America AN - 1664434144; 2015-023133 AB - Seismic tomography is currently evolving towards 3D earth models that satisfy full seismic waveforms at increasingly high frequencies. This evolution is possible thanks to the advent of powerful numerical methods such as the Spectral Element Method (SEM) that allow accurate computation of the seismic wavefield in complex media, and the drastic increase of computational resources. However, the production of such models requires handling complex misfit functions with more than one local minimum. Standard linearized inversion methods (such as gradient methods) have two main drawbacks: 1) they produce solution models highly dependent on the starting model; 2) they do not provide a means of estimating true model uncertainties. However, these issues can be addressed with stochastic methods that can sample the space of possible solutions efficiently. Such methods are prohibitively challenging computationally in 3D, but increasingly accessible in 1D. In previous work (Yuan and Romanowicz, 2010; Yuan et al., 2011) we developed a continental scale anisotropic upper mantle model of north America based on a combination of long period seismic waveforms and SKS splitting measurements, showing the pervasive presence of layering of anisotropy in the cratonic lithosphere with significant variations in depth of the mid-lithospheric boundary. The radial anisotropy part of the model has been recently updated using the spectral element method for forward wavefield computations and waveform data from the latest deployments of USarray (Yuan and Romanowicz, 2013). However, the long period waveforms (periods > 40s) themselves only provide a relatively smooth view of the mantle if the starting model is smooth, and the mantle discontinuities necessary for geodynamical interpretation are not imaged. Increasing the frequency of the computations to constrain smaller scale features is possible, but challenging computationally, and at the risk of falling in local minima of the misfit function. In this work we propose instead to directly tackle the non-linearity of the inverse problem by using stochastic methods to construct a 3D starting model with a good estimate of the depths of the main layering interfaces. We present preliminary results of the construction of such a starting 3D model based on: (1) Regionalizing the study area to define provinces within which lateral variations are smooth; (2) Applying trans-dimensional stochastic inversion (Bodin et al., 2012) to obtain accurate 1D models in each province as well as the corresponding error distribution, constrained by receiver function and surface wave dispersion data as well as the previously constructed 3D model (name), and (3) connecting these models laterally using data-driven smoothing operators to obtain a starting 3D model with errors. JF - American Geophysical Union Fall Meeting AU - Calo, M AU - Bodin, T AU - Yuan, H AU - Romanowicz, B A AU - Larmat, C S AU - Maceira, M AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S33A EP - 2400 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664434144?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Constructing+a+starting+3D+shear+velocity+model+with+sharp+interfaces+for+SEM-based+upper+mantle+tomography+in+North+America&rft.au=Calo%2C+M%3BBodin%2C+T%3BYuan%2C+H%3BRomanowicz%2C+B+A%3BLarmat%2C+C+S%3BMaceira%2C+M%3BAnonymous&rft.aulast=Calo&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Fugitive methane source detection and discrimination with the Picarro Mobile methane investigator AN - 1660632391; 2015-018739 AB - Here we present the results of the field deployment and benchmark testing of the Picarro Mobile Methane Investigator (PMMI). The PMMI is a mobile platform that measures methane concentration (cavity ringdown spectroscopy), del13CH4, wind speed and direction, and GPS location. On-board integrated software displays the data in realtime, allowing for quick and informed operator input resulting in the identification of surrounding methane sources. Using location data, methane concentration, and wind speed and direction, methane flux from the identified source can be estimated. We report on three measurement campaigns, focussing on thermogenic emissions in the Rocky Mountain Oilfiled Testing Center (Casper, WY), oil and gas fields in Eddy County NM , and oil and gas fields in San Juan County, NM. We find that many of oil/gas wells and facilities sampled have substantial fugitive emissions, and that the isotopic enrichment of those methane emissions varies depending on the formation from which it originated. JF - American Geophysical Union Fall Meeting AU - Arata, Caleb AU - Rahn, T A AU - Aubrey, Andrew D AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract A53A EP - 0150 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632391?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Fugitive+methane+source+detection+and+discrimination+with+the+Picarro+Mobile+methane+investigator&rft.au=Arata%2C+Caleb%3BRahn%2C+T+A%3BAubrey%2C+Andrew+D%3BAnonymous&rft.aulast=Arata&rft.aufirst=Caleb&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Field observations of methane emissions from unconventional and conventional fossil fuel exploration AN - 1660631538; 2015-018747 AB - Energy from methane (CH (sub 4) ) has lower carbon dioxide and air pollutant emissions per unit energy produced than coal or oil making it a desirable fossil fuel. Hydraulic fracturing is allowing United States to harvest the nation's abundant domestic shale gas reservoirs to achieve energy independence. However, CH (sub 4) is a gas that is hard to contain during mining, processing, transport and end-use. Therefore fugitive CH (sub 4) leaks occur that are reported in bottom up inventories by the EPA. Recent targeted field observations at selected plays have provided top down CH (sub 4) leak estimates that are larger than the reported EPA inventories. Furthermore, no long-term regional baselines are available to delineate leaks from unconventional mining operations from historical conventional mining. We will report and compare observations of fugitive CH (sub 4) leaks from conventional and unconventional mining to understand changes from technology shifts. We will report in situ and regional column measurements of CH (sub 4) , its isotopologue (super 13) CH (sub 4) and ethane (C (sub 2) H (sub 6) ) at our Four Corners site near Farmington, NM. The region has substantial coal bed methane, conventional oil and gas production, processing and distribution with minimal hydraulic fracturing activity. We observe large enhancements in in situ and regional column CH (sub 4) with distinct time dependence. Our in situ (super 13) CH (sub 4) observations and remote C (sub 2) H (sub 6) /CH (sub 4) provide strong evidence of thermogenic sources. Comparisons of WRF-simulations with emissions inventory (Edgar) with our observations show that the fugitive CH (sub 4) leaks from conventional mining are 3 times greater than reported. We also compare in situ mobile surveys of fugitive CH (sub 4) and (super 13) CH (sub 4) leak signals in basins with conventional (San Juan) mining and unconventional (Permian and Powder River) mining. A large number of active and closed wells were sampled in these regions. Furthermore, play scale surveys on public roads allowed us to gain a regional perspective. The composition of atmospheric (super 13) CH (sub 4) observed in the Powder River basin was lighter than the Permian and San Juan basins indicating a higher microbial generated fraction. More extensive and larger CH (sub 4) enhancements were measured in the Permian basin that could be a result of the large expansion of unconventional oil and gas production in this region. However, there are variations amongst wells and plays suggesting that operator practices and reservoir formation play a role in determining the fugitive leaks. JF - American Geophysical Union Fall Meeting AU - Dubey, M AU - Lindenmaier, R AU - Arata, Caleb AU - Costigan, K R AU - Frankenberg, Christian AU - Kort, E A AU - Rahn, T A AU - Henderson, B G AU - Love, S P AU - Aubrey, Andrew D AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract A53H EP - 05 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660631538?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Field+observations+of+methane+emissions+from+unconventional+and+conventional+fossil+fuel+exploration&rft.au=Dubey%2C+M%3BLindenmaier%2C+R%3BArata%2C+Caleb%3BCostigan%2C+K+R%3BFrankenberg%2C+Christian%3BKort%2C+E+A%3BRahn%2C+T+A%3BHenderson%2C+B+G%3BLove%2C+S+P%3BAubrey%2C+Andrew+D%3BAnonymous&rft.aulast=Dubey&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - The impact of methane clathrate emissions on the Earth system AN - 1660631339; 2015-018645 AB - Methane is locked in ice-like deposits called clathrates in ocean sediments and underneath permafrost regions. Clathrates are stable under high pressures and low temperatures, so in a warming climate, increases in ocean temperatures could lead to dissociation of the clathrates and release methane into the ocean and subsequently the atmosphere, where methane is both an important greenhouse gas and a key species in atmospheric chemistry. Clathrates in the shallower parts of the Arctic Ocean (around 300m depth) are predicted to be particularly important since clathrates at that depth are expected to start outgassing abruptly in the next few decades. We will present the atmospheric impact of such methane emissions using multi-century steady-state simulations with a version of the Community Earth System Model (CESM) that includes atmospheric chemistry. Our simulations include a plausible release from clathrates in the Arctic that increases global methane emissions above present-day conditions by 22%, as well as a scenario with 10 times those clathrate emissions. The CESM model includes a fully interactive physical ocean, to which we added a fast atmospheric chemistry mechanism that represents methane as a fully interactive tracer (with emissions rather than concentration boundary conditions). The results indicate that such Arctic clathrate emissions (1) increase global methane concentrations by an average of 38%, non-uniformly; (2) increase surface ozone concentrations by around 10% globally, and even more in polluted regions; (3) increase methane lifetime by 13%; (4) increase the interannual variability in surface methane, surface ozone, and methane lifetime, and (5) show modest differences in surface temperature and methane lifetime compared to simulations in which the clathrate emissions are distributed uniformly. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. JF - American Geophysical Union Fall Meeting AU - Cameron-Smith, P J AU - Bhattacharyya, S AU - Bergmann, D J AU - Reagan, M T AU - Elliott, S AU - Moridis, G J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract A23D EP - 0278 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660631339?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+impact+of+methane+clathrate+emissions+on+the+Earth+system&rft.au=Cameron-Smith%2C+P+J%3BBhattacharyya%2C+S%3BBergmann%2C+D+J%3BReagan%2C+M+T%3BElliott%2C+S%3BMoridis%2C+G+J%3BAnonymous&rft.aulast=Cameron-Smith&rft.aufirst=P&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - The Los Alamos Seismic Network (LASN); improved network instrumentation, local earthquake catalog updates, and peculiar types of data AN - 1660631150; 2015-018806 AB - The Los Alamos Seismic Network (LASN) has operated for 41 years, and provided the data to locate more than 2,500 earthquakes in north-central New Mexico. The network was installed for seismic verification research, as well as to monitor and locate earthquakes near Los Alamos National Laboratory (LANL). LASN stations are the only monitoring stations in New Mexico north of Albuquerque. The original network once included 22 stations in northern Mew Mexico. With limited funding in the early 1980's, the network was downsized to 7 stations within an area of about 15 km (N-S) by 15 km (E-W), centered on Los Alamos. Over the last four years, eight additional stations have been installed, which have considerably expanded the spatial coverage of the network. Currently, 7 stations have broadband, three-component seismometers with digital telemetry, and the remaining 8 have traditional 1 Hz short-period seismometers with either analog telemetry or on-site digital recording. A vertical array of accelerometers was also installed in a wellbore on LANL property. This borehole array has 3-component digital strong-motion sensors. Recently we began upgrading the local strong-motion accelerometer (SMA) network as well, with the addition of high-resolution digitizers and high-sensitivity force-balance accelerometers (FBA). We will present an updated description of the current LASN station, instrumentation and telemetry configurations, as well as the data acquisition and event-detection software structure used to record events in Earthworm. Although more than 2,000 earthquakes were detected and located in north-central New Mexico during the first 11 years of LASN's operation (1973 to 1984), currently only 1-2 earthquakes per month are detected and located within about 150 km of Los Alamos. Over 850 of these nearby earthquakes have been located from 1973 to present. We recently updated the LASN earthquake catalog for north-central New Mexico up through 2012 and most of 2013. Locations for these earthquakes are based on new, consistently picked arrival times, updated station locations, and the best available velocity model. Most have magnitudes less than 1.5 and are not contained in the catalogs of any other network. With 3 of the new broadband stations in and around the nearby Valles Caldera, LASN is now able to monitor even very small volcano-seismic events that may be associated with the caldera. The expanded station coverage and instrument sensitivity has also allowed detection of smaller, more distant events and new types of peculiar, non-earthquake signals we had not previously seen (e.g., train noise). These unusual signals have complicated our event discrimination efforts. We will show an updated map of north-central New Mexico seismicity based on these recent efforts, as well as examples of some the new types of data LASN is now picking up. Although the network and data are generally not accessible to the public, requests for data can be granted on a case-by-case basis. JF - American Geophysical Union Fall Meeting AU - Roberts, P M AU - Ten Cate, J A AU - House, L S AU - Greene, M K AU - Morton, E AU - Kelley, R E AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract S51A EP - 2287 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660631150?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+Los+Alamos+Seismic+Network+%28LASN%29%3B+improved+network+instrumentation%2C+local+earthquake+catalog+updates%2C+and+peculiar+types+of+data&rft.au=Roberts%2C+P+M%3BTen+Cate%2C+J+A%3BHouse%2C+L+S%3BGreene%2C+M+K%3BMorton%2C+E%3BKelley%2C+R+E%3BAnonymous&rft.aulast=Roberts&rft.aufirst=P&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Quantifying seasonal dynamics of surface inundation on the Barrow Peninsula, AK AN - 1656036267; 2015-015019 AB - Wetlands are commonly distributed across the Arctic Coastal Plain of Northern Alaska, a low-gradient region underlain by continuous permafrost. They are important components of the global biogeochemical cycle because of the large carbon stores and potential release of this carbon as CO2 and CH4 due to climate change. These wetlands are recharged seasonally by water from snowmelt and summer rainfall, but their area shrinks significantly during the snow free season every year. While seasonal and long-term thaw lake area change is well documented, the seasonal dynamics of smaller wetland features including polygon ponds is poorly quantified. Understanding and quantifying the factors driving and controlling the spatial redistribution of surface water will help in the parameterization of models and evaluation of predictions of water, energy and carbon budgets for lowland Arctic regions. In this study, we used high spatial resolution images (WorldView 2 and QuickBird) on 9 dates from 2006-2012 to investigate the seasonal change and spatial pattern of surface water area for a 4700 ha wetland near Barrow, AK. We found that the surface water area decreased dramatically throughout the summer each year. For example, it decreased by 782 ha (74%) from June 24 to July 21 and continued to decrease by 153 ha (54%) from July 21 to August 4 in 2010. The correlation between the seasonal change in surface water area and local precipitation minus evapotranspiration was low, indicating that the local water balance had little direct control on the change in surface water area through the Summer. Instead, the post snowmelt change in the area of surface inundation as a function of time was well fit by the equation for hydrograph recession, indicating that drainage of ponded water in July and August may be primarily controlled by shallow subsurface flow rather than through evapotranspiration, even in this very low gradient environment. The rate of drainage of surface water was significantly different between DTLBs of different ages, with young DTLBs being the fastest, followed by medium age, and old and ancient DTLBs. In terms of spatial distribution pattern, we found that about 70% of surface water area was distributed in the DTLBs. The percentage of surface water area in the individual DTLBs was relatively stable in the same season of every year, as there was high correlation in the percentage of surface water area within DTLBs among similar seasons no matter whether they were from the same year or different years. During and right after spring snowmelt, macro-topography (represented by mean elevation of DTLBs) controlled the spatial distribution of surface water area. While in July and August, the micro-topography (represented by ice-wedge polygons) controlled the distribution of surface water area. Specifically, during and right after snowmelt, the DTLBs with lower elevations tended to have higher percentage of inundated area. In July and August, the DTLBs with ice-wedge polygons tended to have higher percentage of surface water area. JF - American Geophysical Union Fall Meeting AU - Wilson, C J AU - Chen, Min AU - Rowland, J C AU - Altmann, G L AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract B44C EP - 02 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656036267?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Quantifying+seasonal+dynamics+of+surface+inundation+on+the+Barrow+Peninsula%2C+AK&rft.au=Wilson%2C+C+J%3BChen%2C+Min%3BRowland%2C+J+C%3BAltmann%2C+G+L%3BAnonymous&rft.aulast=Wilson&rft.aufirst=C&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Analysis of a 2006 seismic swarm near Volcano Pico de Tancitaro in Michoacan AN - 1656034097; 2015-015112 AB - In the year 2006 a major seismic swarm occurred between the end May and early July, near Pico de Tancitaro and Paricutin Volcanos in Michoacan, inside the Michoacan-Guanajuato volcanic field (MGVF) in Mexico. This seismic swarm was recorded by the project "Mapping the Riviera Subduction Zone" (MARS), a temporary seismic network that was installed in the states of Jalisco, Colima and Michoacan between January, 2006 and June, 2007. A previous study about this swarm was published in 2010, noting 700 earthquakes, detected automatically by Antelope over a period of 41 days, with magnitudes between ML 2.4 and 3.7. The activity was reported as a magmatic intrusion. This area is a monogenetic volcano field where in 1943 Paricutin volcano was born, so it is necessary to confirm the possible sources of this seismic activity, and analyze the process in greater detail. In this effort we locate of all the events that occurred during this seismic swarm using Hypo-71 and a local P wave velocity model. Using waveform cross-correlation with a variety of earthquakes to serve as templates, we scan the waveform database for repeating events, which are often observed in volcanic and geothermal settings. So far, 500 earthquakes have been identified and separated into at least 8 distinct families. JF - American Geophysical Union Fall Meeting AU - Pinzon, J I AU - Nunez-Cornu, F J AU - Rowe, C A AU - Escudero, C R AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract V23A EP - 2786 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656034097?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Analysis+of+a+2006+seismic+swarm+near+Volcano+Pico+de+Tancitaro+in+Michoacan&rft.au=Pinzon%2C+J+I%3BNunez-Cornu%2C+F+J%3BRowe%2C+C+A%3BEscudero%2C+C+R%3BAnonymous&rft.aulast=Pinzon&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Thermodynamic and geological constraints to climate-driven hydrate dissociation under various climate change scenarios AN - 1656033840; 2015-014976 AB - It has been postulated that methane from oceanic hydrates may have a significant role in future climate, but the behavior of contemporary oceanic methane hydrate deposits subjected to rapid temperature changes has only recently been investigated. Field investigations have discovered substantial methane releases in the shallow Arctic Ocean margin, suggesting warming-driven processes that may be related to shallow hydrate deposits and raising the question of whether these releases may increase and become more common in the future. Previous work has established that such methane release is strongly regulated by coupled thermo-hydrological-transport processes in the sediments and coupled biogeochemical processes in the water column. In this work, we assess the ability of various climate-change scenarios, including historical hindcasts and forward-looking scenarios with moderate and strong forcings, to affect gas hydrates, and highlight factors that increase or decrease the possibility of climate-driven hydrate dissociation and determine the spatial distribution of the methane release. The results show that at the present time, the methane release due to hydrate dissociation is unlikely to have started on a large scale, and in the future, it is likely to be confined to a narrow region of high dissociation susceptibility (defined mainly by depth and temperature), and further, that any release will be relatively uniform and controlled, rather than explosive. However, coupled ocean-climate simulations indicate that released quantities can be biogeochemically and climatologically significant, and bubble-plume dynamics, oceanic nutrient and resource limitations, and localized atmospheric chemistry processes may give the limited quantities additional environmental significance. JF - American Geophysical Union Fall Meeting AU - Reagan, M T AU - Elliott, S AU - Cameron-Smith, P J AU - Maltrud, M E AU - Moridis, G J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract B33K EP - 0620 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656033840?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Thermodynamic+and+geological+constraints+to+climate-driven+hydrate+dissociation+under+various+climate+change+scenarios&rft.au=Reagan%2C+M+T%3BElliott%2C+S%3BCameron-Smith%2C+P+J%3BMaltrud%2C+M+E%3BMoridis%2C+G+J%3BAnonymous&rft.aulast=Reagan&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Quartz fabric insights across a low P-high T shear zone AN - 1656033571; 2015-012850 AB - The evolution of mylonitic fabric in quartzites across a Low-P/High-T gradient within the Lugo Dome Extensional system (NW Spain) is analyzed. Quantitative texture measurements with TOF neutron diffraction, Shape preferred orientation (SPO) and Crystal Size Distribution (CSD) analyses were correlated with tectonothermal data to constraint the prevalence of ductile deformative fabrics exposed to cycles of dynamic and static recrystallization. Results suggest two stages in the evolution of mylonites in close correlation to thermal gradient, 1) a pervasive ductile deformation affecting most of the shear zone volume, with the development of symmetric cross girdle c-axes fabric suggesting slip on {c,r,m} and dynamically recrystallized microstructures which resulted into the refinement of the grain-size. 2) An heterogeneous deformation stage where strain partition led to the formation of relatively active and passive domains. During this late stage, at deeper levels, High T detachments show [c]{m} slip system and dynamic recrystallization activation, with monoclinic texture patterns, meanwhile, passive domains followed an static recrystallization with abnormal grain growth and minor variation of early orthogonal texture patterns JF - American Geophysical Union Fall Meeting AU - Gomez Barreiro, J AU - Martinez-Catalan, J R AU - Benitez Perez, J AU - Wenk, H AU - Vogel, Sven C AU - Alcock, J E AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract T51G EP - 03 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 01B:Mineralogy of silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656033571?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Quartz+fabric+insights+across+a+low+P-high+T+shear+zone&rft.au=Gomez+Barreiro%2C+J%3BMartinez-Catalan%2C+J+R%3BBenitez+Perez%2C+J%3BWenk%2C+H%3BVogel%2C+Sven+C%3BAlcock%2C+J+E%3BAnonymous&rft.aulast=Gomez+Barreiro&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Geochemistry of wellbore integrity in CO (sub 2) sequestration; Portland cement-steel-brine-CO (sub 2) interactions AN - 1645572532; 2015-006109 AB - Effective geologic sequestration of CO (sub 2) requires long-term storage with very low leak rates. Numerous studies have identified wells as one of the key risk factors for CO (sub 2) leakage including purpose-built injection and monitoring wells in addition to older wells in and above the storage reservoir. All wells have the potential to leak due to faulty construction or other defects. However, geochemical reactions induced by CO (sub 2) could result in damage to Portland cement and steel that are used in the well to isolate reservoir fluids from underground drinking water sources and the surface. This concern is based on the thermodynamic incompatibility of CO (sub 2) -saturated aqueous fluids with Portland cement and steel, which leads to relatively rapidly reactions that form, principally, calcium carbonate and iron carbonate. Despite this thermodynamic fate, wellbore materials perform and maintain zonal isolation in field and experimental observations. This is understood as a consequence of coupled behavior between flow of reactants (CO (sub 2) -water) and the rate of dissolution and precipitation of cement or corrosion of steel. In the restricted flow environments found in wellbore systems, cements are carbonated but do not suffer significant deterioration of hydrologic or mechanical properties. In fact, cement carbonation often results in reduced permeability and enhanced mechanical strength. While steel is susceptible to corrosion, wellbore environments allow development of protective iron carbonate scale. In addition, the presence of Portland cement, even carbonated cement, provides protection against significant rates of corrosion. The impact of geochemical reactions in the wellbore environment cannot be separated from coupled flow, thermal and mechanical processes. CO (sub 2) -induced chemical reactions migrating upward from a storage reservoir will not result in the creation of defects or the wholesale dissolution of cement or steel. Defects must exist that allow CO (sub 2) + or -brine to flow and to come in contact with well materials. These defects may originate in faulty construction or arise from thermal and mechanical stresses that crack cement or separate cement-casing and cement-formation interfaces. Once flow along defects occurs, CO (sub 2) -induced reactions may aggravate or ameliorate the condition through dissolution or precipitation. Several experimental and field studies show that cement and steel have substantial self-healing tendencies. These arise from the precipitation of calcium and iron carbonates, but also appear to originate from swelling of residual phases and/or migration and reprecipitation of cement phases. The mechanical behavior of the cement system is of particular importance as plastic deformation of reacted and unreacted cement appears to provide limits to the aperture of defects and thus limits to the effective permeability of wellbore leaks. JF - American Geophysical Union Fall Meeting AU - Carey, J W AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract V31D EP - 05 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645572532?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Geochemistry+of+wellbore+integrity+in+CO+%28sub+2%29+sequestration%3B+Portland+cement-steel-brine-CO+%28sub+2%29+interactions&rft.au=Carey%2C+J+W%3BAnonymous&rft.aulast=Carey&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - JOUR T1 - Transmissivity reduction of fracture due to silica precipitation is faster for variable aperture AN - 1645572521; 2015-006214 AB - Geothermal energy have certain ecological benefits as it does not disturb the local ecosystem. It is also able to generate power with minimum operating cost. The extraction of geothermal energy has grown significantly in the past few decades. One of the major challenges for reservoir scale modeling of geothermal system is to describe the exact configuration of aperture fields. Hence the sustainability of geothermal power plant and future estimation of power production is affected during continuous evolution by geochemical and geomechanical processes. The formation of scale due to precipitation of silica in the wells and the fault creates major problem in the sustainability of the geothermal heat extraction. In this study we simulated the reduction of fracture transmissivity due to precipitation by 3-D simulation of coupled thermo-hydro-chemical (THC) processes a simple geothermal system with a horizontal fault, which connects the injection and production wells to facilitate the cold water circulation. The variability of aperture within the fracture/fault is more realistic and it is known that the reduction of effective transmissivity is accelerated by the heterogeneity of the aperture field. The objective of the study is to understand the results of aperture field heterogeneity on the power production. For comparison among different heterogeneous cases, the initial effective transmissivity has been taken same for each. Using numerical simulation of flow between the wells, the same initial effective transmissivity (i.e. same pressure drop between the wells for same mass flow rate) was attained through iteration. The values of standard deviations were taken in the range of 0 to 0.4. Temperature dependent kinetic rate laws were used for the reactive transport modeling. Here the numerical simulations were performed for injection concentration as the solubility at the temperature in the production well. This extreme case is based on the assumption that there is no precipitation in heat exchanger, pipes and wells. The fracture closes rapidly in the vicinity of low aperture region. These results also indicate that heterogeneous aperture distribution between the wells influences the heat extraction rate and is responsible for productivity variation. JF - American Geophysical Union Fall Meeting AU - Pandey, S N AU - Chaudhuri, Abhijit AU - Kelkar, S AU - Rajaram, Hari AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract V33C EP - 2758 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645572521?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America&rft.atitle=Effects+of+2D+random+velocity+heterogeneities+in+the+mantle+lid+and+Moho+topography+on+P+%28sub+n%29+geometric+spreading&rft.au=Avants%2C+Megan%3BLay%2C+Thorne%3BXie%2C+Xiao-Bi%3BYang%2C+Xiaoning&rft.aulast=Avants&rft.aufirst=Megan&rft.date=2011-02-01&rft.volume=101&rft.issue=1&rft.spage=126&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120100113 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - JOUR T1 - Pore-scale study of the effect of secondary carbonate precipitation on the dissolution of primary minerals using the lattice Boltzmann method AN - 1645571836; 2015-006316 AB - Reactive transport processes involving dissolution and/or precipitation are pervasive in Earth, energy, and environmental systems. One typical example is geologic sequestration of carbon dioxide. Among these reactive processes, it is commonly encountered that a second phase precipitates while the primary phase dissolves, and the precipitation and dissolution reactions are fully coupled with each other. In the case of mineral trapping of CO2, the primary silicate mineral dissolves due to a decrease of pH caused by the dissolution of CO2 into the solution; meanwhile the dissolved CO2 can react with cations to form a secondary precipitate of carbonate mineral. Although the effect of precipitation of secondary solid phase on the dissolution of the primary solid phase has been studied extensively, the results reported in the literature are often inconclusive and sometimes even contradict one another. The reason is that the coupled dissolution and precipitation processes are controlled by several factors whose contribution is difficult to ascertain, including the dissolution and precipitation reaction kinetics, temperature and pressure, pH and species concentration of the solution, physicochemical properties of the primary and secondary minerals, as well as the nucleation and crystal mechanisms of the precipitates, etc. In this study, a pore-scale (mesoscopic) model based on the lattice Boltzmann method (LBM) is developed to investigate the effects of secondary precipitation on the dissolution of the primary mineral. The model can predict coupled multiple physicochemical processes including fluid flow, mass transport, chemical reaction, dissolution, precipitation consisting of nucleation and crystal growth, as well as dynamical evolution of pore geometries. Effects of dissolution and precipitation reaction kinetics, molar volumes of primary and secondary minerals, initial powder size and surface roughness of the primary mineral, as well as nucleation and crystal growth mechanisms on the dissolution and precipitation processes are investigated in terms of rate and amount of dissolution and precipitation. Several types of dissolution and precipitation processes are identified based on the morphology and structure of the precipitates and on the extent to which the precipitates affect the dissolution of the primary mineral. Simulation results are also compared with existing experimental results. Depending on the conditions, the effect of the precipitates spans the full range of possible behavior from trivial changes to enhanced or reduced dissolution rates of the primary phase. JF - American Geophysical Union Fall Meeting AU - Kang, Q AU - Chen, Lichen AU - Carey, J W AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract V34A EP - 02 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645571836?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Pore-scale+study+of+the+effect+of+secondary+carbonate+precipitation+on+the+dissolution+of+primary+minerals+using+the+lattice+Boltzmann+method&rft.au=Kang%2C+Q%3BChen%2C+Lichen%3BCarey%2C+J+W%3BAnonymous&rft.aulast=Kang&rft.aufirst=Q&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - JOUR T1 - Modeling alteration potential in cooling lava domes AN - 1645570197; 2015-006211 AB - Modeling the state of hydrothermal circulation in cooling lava domes can contribute significantly to assessments of dome stability and collapse hazards. Alteration processes may transform primary minerals in dome rock to weaker secondary products such as clay minerals, while secondary mineral precipitation may also affect the porosity and permeability of dome rock with respect to fluids and gas. However, directly imaging the hydrothermal system of a lava dome is impossible without concentrated geophysical investigations, which are often not feasible on rugged volcanic terrains. To circumvent this problem, we turned to porous flow modeling (FEHM), combining finite volume simulations of idealized lava dome geometries with Rock Alteration Index (RAI) calculations. This allowed us to determine likely locations in cooling lava domes where alteration and secondary mineral precipitation, with associated cementing/sealing effects, are most likely to occur. Our results show that mineral dissolution is likely to occur at the base of a cooling lava dome, and precipitation/formation of alteration minerals is likely to occur at the interface between the hot core of a dome and its overlying talus. This suggests that alteration-induced collapses are most likely to initiate at shallow levels in the dome such as in the talus. Such collapses may continue as a series of retrogressive failures and result in major dome collapses. Additionally, precipitating silica minerals at the core/talus interface could create a sub-talus cap of reduced permeability that could restrict fluid and gas circulation, which might contribute to gas pressurization and associated destabilization. JF - American Geophysical Union Fall Meeting AU - Ball, J L AU - Stauffer, P H AU - Calder, E S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract V33C EP - 2755 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645570197?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Modeling+alteration+potential+in+cooling+lava+domes&rft.au=Ball%2C+J+L%3BStauffer%2C+P+H%3BCalder%2C+E+S%3BAnonymous&rft.aulast=Ball&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - JOUR T1 - Insights into CO (sub 2) and solute transport gained from field and numerical studies of natural CO (sub 2) reservoir at St. John's Dome AN - 1645570192; 2015-006370 AB - If CO (sub 2) sequestration into deep geologic reservoirs is to be accepted by the public and environmental regulators, the possibility of upward leakage into shallow groundwater should be acknowledged and those processes well-understood. Studies of natural CO (sub 2) reservoirs and their connection (or lack thereof) with the shallow subsurface is one way to explore these issues. A natural reservoir near Springerville, Arizona leaked CO (sub 2) to the surface along a fault zone for thousands of years, creating large travertine deposits. In recent times, the CO (sub 2) leak rates have declined significantly yet the shallow aquifer is still highly enriched in CO (sub 2) . In this study we use field data and simulations to investigate the primary transport processes responsible for upward leakage of CO (sub 2) . Stable isotopes suggest that the CO (sub 2) in the shallow aquifer above the reservoir originated in the deep reservoir, and was transported upward in the dissolved phase with significant degassing. Major and trace element data indicate that geochemical anomalies are caused by upward co-transport of CO (sub 2) and brine, rather than in-situ CO (sub 2) -driven reactions. We use multiphase flow simulations to determine possible rates of reservoir depletion due to upward leakage along the fault zone. This integrated approach combining geochemical data analysis and simulation provides key insights into CO (sub 2) and solute flow and transport mechanisms at the reservoir scale. JF - American Geophysical Union Fall Meeting AU - Keating, E H AU - Newell, Dennis L AU - Dempsey, D AU - Pawar, Rajesh AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract V41A EP - 2768 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645570192?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Insights+into+CO+%28sub+2%29+and+solute+transport+gained+from+field+and+numerical+studies+of+natural+CO+%28sub+2%29+reservoir+at+St.+John%27s+Dome&rft.au=Keating%2C+E+H%3BNewell%2C+Dennis+L%3BDempsey%2C+D%3BPawar%2C+Rajesh%3BAnonymous&rft.aulast=Keating&rft.aufirst=E&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - JOUR T1 - Recognition and characterization of networks of water bodies in the Arctic ice-wedge polygonal tundra using high-resolution satellite imagery AN - 1618132779; 2014-084445 AB - Arctic lowland landscapes underlain by permafrost are often characterized by polygon-like patterns such as ice-wedge polygons outlined by networks of ice wedges and complemented with polygon rims, troughs, shallow ponds and thermokarst lakes. Polygonal patterns and corresponding features are relatively easy to recognize in high spatial resolution satellite imagery by a human, but their automated recognition is challenging due to the variability in their spectral appearance, the irregularity of individual trough spacing and orientation within the patterns, and a lack of unique spectral response attributable to troughs with widths commonly between 1 m and 2 m. Accurate identification of fine scale elements of ice-wedge polygonal tundra is important as their imprecise recognition may bias estimates of water, heat and carbon fluxes in large-scale climate models. Our focus is on the problem of identification of Arctic polygonal tundra fine-scale landscape elements (as small as 1 m - 2 m width). The challenge of the considered problem is that while large water bodies (e.g. lakes and rivers) can be recognized based on spectral response, reliable recognition of troughs is more difficult. Troughs do not have unique spectral signature, their appearance is noisy (edges are not strong), their width is small, and they often form connected networks with ponds and lakes, and thus they have overlapping spectral response with other water bodies and surrounding non-water bodies. We present a semi-automated approach to identify and classify Arctic polygonal tundra landscape components across the range of spatial scales, such as troughs, ponds, river- and lake-like objects, using high spatial resolution satellite imagery. The novelty of the approach lies in: (1) the combined use of segmentation and shape-based classification to identify a broad range of water bodies, including troughs, and (2) the use of high-resolution WorldView-2 satellite imagery (with resolution of 0.6 m) for this identification. The approach starts by segmenting water bodies from an image, which are then categorized using shape-based classification. Segmentation uses combination of pan sharpened multispectral bands and is based on the active contours without edges technique. The segmentation is robust to noise and can detect objects with weak boundaries that is important for extraction of troughs. We then categorize the segmented regions via shape based classification. Because segmentation accuracy is the main factor impacting the quality of the shape-based classification, for segmentation accuracy assessment we created reference image using WorldView-2 satellite image of ice-wedge polygonal tundra. Reference image contained manually labelled image regions which cover components of drainage networks, such as troughs, ponds, rivers and lakes. The evaluation has shown that the approach provides a good accuracy of segmentation and reasonable classification results. The overall accuracy of the segmentation is approximately 95%, the segmentation user's and producer's accuracies are approximately 92% and 97% respectively. JF - American Geophysical Union Fall Meeting AU - Skurikhin, A N AU - Gangodagamage, C AU - Rowland, J C AU - Wilson, C J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C53A EP - 0540 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618132779?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Recognition+and+characterization+of+networks+of+water+bodies+in+the+Arctic+ice-wedge+polygonal+tundra+using+high-resolution+satellite+imagery&rft.au=Skurikhin%2C+A+N%3BGangodagamage%2C+C%3BRowland%2C+J+C%3BWilson%2C+C+J%3BAnonymous&rft.aulast=Skurikhin&rft.aufirst=A&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Using deuterium and Oxygen-18 to understand multi-scale hydrology of an Arctic landscape near Barrow, Alaska AN - 1618132693; 2014-084449 AB - The hydrology of Arctic landscapes is driven by multiple water sources including rainfall, snowmelt, and melting subsurface ice. Geomorphologic controls are also important at small scales where patterned ground affects surface/subsurface water connections and mixing in the active layer. Larger scale features such as drained thaw lake basins and river/stream drainage channels integrate the smaller scale hydrologic systems and can indicate dominant sources/processes which need to be better understood for large scale modeling of linked Arctic water/carbon systems. This presentation discusses the use of deuterium and oxygen-18 stable isotope analyses of water samples at the patterned ground/drained thaw lake basin/ drainage channel scales to identify and quantify water source contributions and understand how small scale hydrological variations are transferred to larger scale systems. We conducted multi-scale synoptic sampling for stable isotopes in July and September, 2013 near Barrow, Alaska as part of the DOE Office of Science Next Generation Ecosystem Experiment (NGEE-Arctic) project. Surface waters, shallow subsurface water (<10 cm), and deeper subsurface water (at the frost line) were sampled to evaluate lateral and vertical distributions of the stable isotopes and their hydrological implications. We also collected a series of precipitation and surface water samples with time from the melt period in June through active layer development into September. These isotope data will help define how contributions from the various sources change over time. JF - American Geophysical Union Fall Meeting AU - Newman, B D AU - Throckmorton, H AU - Heikoop, J M AU - Altmann, G AU - Cohen, L R AU - Gard, M AU - Hudak, M AU - Perkins, G AU - Wilson, C J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C53A EP - 0545 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618132693?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Using+deuterium+and+Oxygen-18+to+understand+multi-scale+hydrology+of+an+Arctic+landscape+near+Barrow%2C+Alaska&rft.au=Newman%2C+B+D%3BThrockmorton%2C+H%3BHeikoop%2C+J+M%3BAltmann%2C+G%3BCohen%2C+L+R%3BGard%2C+M%3BHudak%2C+M%3BPerkins%2C+G%3BWilson%2C+C+J%3BAnonymous&rft.aulast=Newman&rft.aufirst=B&rft.date=2013-12-01&rft.volume=408&rft.issue=2&rft.spage=183&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2010.11.032 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Microtopography-resolving simulations of surface and subsurface hydrology in thawing and topographically evolving permafrost regions AN - 1618132526; 2014-084426 AB - Simulating the hydrologic system in degrading permafrost regions is challenging because of the potential for topographic evolution and associated drainage network reorganization as permafrost thaws and massive ground ice melts. The critical process models required for simulating hydrology in permafrost affected regions include subsurface thermal hydrology of freezing/thawing soils, thermal processes within ice wedges, mechanical deformation processes, overland flow, and surface energy balances including snow dynamics. A new simulation tool, the Arctic Terrestrial Simulator (ATS), is being developed to simulate those coupled processes. Overland flow with freezing of ponded water is represented with a new non-isothermal extension of the diffusion wave equation. Moisture dynamics in the subsurface is represented by a three-phase, non-isothermal extension of Richards equation. The subsurface and surface non-isothermal flow models are coupled with a surface energy balance and a single-layer snow model. A vertical grid displacement algorithm based on calculated melt volumes of massive ground ice is used in place of more expensive soil geomechanics calculations to represent topographic evolution. Highly parallel simulations using high-resolution digital elevation maps of the polygonal patterned ground landscape at the Barrow Environmental Observatory illustrate the strong feedbacks among the processes. Challenges and potential approaches to parameterizing, initializing, and building confidence in the complex coupled models will also be discussed. This work was supported by LANL Laboratory Directed Research and Development Project LDRD201200068DR and by the The Next-Generation Ecosystem Experiments (NGEE Arctic) project. NGEE-Arctic is supported by the Office of Biological and Environmental Research in the DOE Office of Science. JF - American Geophysical Union Fall Meeting AU - Painter, S L AU - Moulton, J D AU - Wilson, C J AU - Atchley, A L AU - Berndt, M AU - Coon, E AU - Gangodagamage, C AU - Garimella, R AU - Miller, T A AU - Short, L S AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C52A EP - 05 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618132526?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Microtopography-resolving+simulations+of+surface+and+subsurface+hydrology+in+thawing+and+topographically+evolving+permafrost+regions&rft.au=Painter%2C+S+L%3BMoulton%2C+J+D%3BWilson%2C+C+J%3BAtchley%2C+A+L%3BBerndt%2C+M%3BCoon%2C+E%3BGangodagamage%2C+C%3BGarimella%2C+R%3BMiller%2C+T+A%3BShort%2C+L+S%3BAnonymous&rft.aulast=Painter&rft.aufirst=S&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Modeling active layer and permafrost dynamics of ice wedge polygon dominated Arctic ecosystems AN - 1618132021; 2014-084440 AB - Permafrost soils contains vast stock of frozen organic carbon. As warming climate accelerates the thaw of the permafrost, increasing amount of organic matter is exposed to respiration leading to release of carbon to the atmosphere in the form of CO2 and CH4. Permafrost thermal dynamics play a key role influencing hydrologic and biogeochemical processes in these ecosystems. Large areas of Arctic landscape are covered by the patterned ground features created by repeated freezing and thawing of soil underlain by aerially continuous permafrost. These microtopographic features in the landscape controls the local surface-subsurface hydrology and thermal regimes through differential transport of heat and water. Study of these interacting thermal-hydrologic-biogeochemical in permafrost soils are further complicated by the complex topography and heterogeneity of subsurface. We have developed and applied a coupled multiscale-multiphase-multicomponent surface-subsurface flow and reactive transport model PFLOTRAN for modeling of thermal-hydrologic-biogeochemical processes in permafrost soils. We study the permafrost thermal dynamics, role of microtopography in local scale hydrology at the Department of Energy's Next Generation Ecosystem Experiment (NGEE) - Arctic field sites near Barrow, Alaska. High resolution LiDAR data is used to represent the microtopography at sub-meter resolution in PFLOTRAN. Long term simulations have been conducted at the field sites informed by the observations from field and laboratory campaigns to study and understand the hydrologic and biogeochemical processes in these Arctic ecosystems. JF - American Geophysical Union Fall Meeting AU - Kumar, J AU - Bisht, G AU - Liljedahl, A AU - Mills, R T AU - Karra, S AU - Painter, S L AU - Thornton, P E AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C53A EP - 0535 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618132021?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Modeling+active+layer+and+permafrost+dynamics+of+ice+wedge+polygon+dominated+Arctic+ecosystems&rft.au=Kumar%2C+J%3BBisht%2C+G%3BLiljedahl%2C+A%3BMills%2C+R+T%3BKarra%2C+S%3BPainter%2C+S+L%3BThornton%2C+P+E%3BAnonymous&rft.aulast=Kumar&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - The roles of channelization and parameter sensitivity on feedbacks between subglacial hydrology and glacier dynamics AN - 1618131915; 2014-084468 AB - On most glaciers and ice sheet outlets the majority of motion is due to basal sliding, but the importance of feedbacks between subglacial and hydrology and glacier dynamics are poorly understood. Using a coupled subglacial hydrology and glacier dynamics model, we investigate parameter sensitivity of feedbacks between the two systems by simulating a meltwater-induced speedup event on an idealized mountain glacier, both with and without allowing channelization of subglacial drainage. When channelized drainage is absent, we find that net feedbacks are strongly negative over a wide range of the hydrology model and sliding law parameter space, indicating that the sliding-opening of subglacial cavities is the dominant feedback between the water and ice systems. Net positive feedbacks, which do occasionally occur in our parameter space, are rare and brief. Parameter combinations that favor feedback strength at initial vs. later times differ due to the role of drainage system evolution in the coupled system. When channelization is allowed, feedbacks between subglacial hydrology and ice dynamics can still control a substantial fraction of the magnitude and duration of the response to a speedup event prior to channelization. However, our modeling also argues that subglacial channelization is required to terminate surface meltwater induced speedup events over timescales that are commensurate with observations of late summer slowdown. Feedbacks between subglacial hydrology and ice dynamics appear to be insignificant once channelized drainage becomes efficient because evolution of distributed drainage is thereafter dominated by the influence of the channel. JF - American Geophysical Union Fall Meeting AU - Hoffman, M J AU - Price, S F AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C53B EP - 0565 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618131915?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+roles+of+channelization+and+parameter+sensitivity+on+feedbacks+between+subglacial+hydrology+and+glacier+dynamics&rft.au=Hoffman%2C+M+J%3BPrice%2C+S+F%3BAnonymous&rft.aulast=Hoffman&rft.aufirst=M&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Deployment of indicator of reduction in soils (IRIS) probes in Arctic drained thaw lake basins and drainages; time integrated signals of soil saturation and redox AN - 1618131797; 2014-084444 AB - Climate driven warming and degradation of permafrost may lead to changes in the hydrology of low gradient regions like the North Slope of Alaska. Hydrologic changes will affect the saturation and redox state of soils in drained thaw lake basins (DTLBs), interlake areas, and associated drainages. These changes are being investigated at the Barrow Environmental Observatory (BEO) and surroundings as part of the Next Generation Ecosystem Experiment - Arctic project. As a complement to traditional redox and aqueous chemistry measurements, the use of indicator of reduction in soils (IRIS) probes is being assessed as a simple and cost-effective way to monitor redox changes. The probes consist of PVC sheets coated with a ferrihydrite paint. Under reducing conditions iron on these probes will partially dissolve. The amount of dissolution can be quantified by image analysis and related in a semi-quantitative fashion to redox conditions in the soils. IRIS probes have been successfully utilized in numerous temperate settings to demonstrate, for example, the presence of reducing soils for wetlands delineation. Test probes were installed in saturated soils for 48 hours in July, 2013. After 48 hours, minor reductive dissolution of ferrihydrite was observed. No sulfide precipitation was noted. As such, probes were installed in quadruplicate at 14 locations representing primarily outlet drainages from different-aged DTLBs and interlake areas. In each case, the probes were installed to refusal at the frost table within the active layer overlying the permafrost. IRIS probes were deployed adjacent to arrays of rhizon samplers used for soil pore water sampling so that time-integrated IRIS probe results can be compared to chemical results (a snapshot in time) obtained at the beginning and end of the monitoring period (probes will be extracted in September). Image analysis will employ LANL's GENIE technology. Field measurements of ferrous iron in water samples showed significant redox variation both between locations and with depth at each location. Values were lowest in surface waters (as low as zero mg/L) and were generally higher in soil pore water with values up to approximately 7 mg/L. Correlations between percentage iron removal from the IRIS probes and ferrous iron and other redox sensitive species will be presented. If correlations are significant, redox couples (ammonia/nitrate, Fe(II)/Fe(III), sulfide/sulfate) will be used to estimate Eh and to develop an empirical relationship for the use of IRIS probes in the BEO and surrounding environs. JF - American Geophysical Union Fall Meeting AU - Heikoop, J M AU - Newman, B D AU - Hudak, M AU - Gard, M AU - Altmann, G AU - Throckmorton, H AU - Wilson, C J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C53A EP - 0539 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 25:Soils UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618131797?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Deployment+of+indicator+of+reduction+in+soils+%28IRIS%29+probes+in+Arctic+drained+thaw+lake+basins+and+drainages%3B+time+integrated+signals+of+soil+saturation+and+redox&rft.au=Heikoop%2C+J+M%3BNewman%2C+B+D%3BHudak%2C+M%3BGard%2C+M%3BAltmann%2C+G%3BThrockmorton%2C+H%3BWilson%2C+C+J%3BAnonymous&rft.aulast=Heikoop&rft.aufirst=J&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - A multi-scale approach to representing tundra permafrost dynamics in a coupled climate system model AN - 1566814992; 2014-076097 AB - Current generation Earth system models do not resolve the microtopographic features and sub-surface structural complexity of ice-wedge polygonal tundra in the Arctic. The high carbon density of permafrost soils in many polygonal tundra systems raises concern about the potential for strong positive feedbacks under conditions of radiatively-forced climate warming. The thermal and hydrologic responses of these systems to warming are thought to depend in part on existing drainage patterns and how those patterns might change as the active layer thickens, while the balance of net carbon flux occurring as carbon dioxide versus methane depends on biological, thermal, and hydrologic state. By explicitly representing microtopographic variability and sub-surface dynamics in a fine-scale model, informed by intensive site-scale measurements and laboratory experimentation, we are able to generate semi-empirical parameterizations that capture the mean behavior of energy, water, and carbon fluxes at scales amenable to application in an Earth system model. We demonstrate an example of this multi-scale approach merging observations and modeling for polygonal tundra near Barrow, Alaska, as a component of the Next Generation Ecosystem Experiment (NGEE) Arctic project. JF - American Geophysical Union Fall Meeting AU - Thornton, P E AU - Kumar, Jitendra AU - Painter, S L AU - Bisht, G AU - Hammond, G E AU - Mills, R T AU - Tang, G AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract B31H EP - 05 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566814992?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Special+Publication+-+Nevada+Bureau+of+Mines+and+Geology&rft.atitle=Infrasonic+observations+from+the+February+21%2C+2008+Wells+earthquake&rft.au=Burlacu%2C+Relu%3BArrowsmith%2C+Stephen%3BHayward%2C+Chris%3BStump%2C+Brian&rft.aulast=Burlacu&rft.aufirst=Relu&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=173&rft.isbn=&rft.btitle=&rft.title=Special+Publication+-+Nevada+Bureau+of+Mines+and+Geology&rft.issn=02756285&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Quantifying Arctic terrestrial environment behaviors using geophysical, point-scale and remote sensing data AN - 1566814671; 2014-076170 AB - Improvement in parameterizing Arctic process-rich terrestrial models to simulate feedbacks to a changing climate requires advances in estimating the spatiotemporal variations in active layer and permafrost properties - in sufficiently high resolution yet over modeling-relevant scales. As part of the DOE Next-Generation Ecosystem Experiments (NGEE-Arctic), we are developing advanced strategies for imaging the subsurface and for investigating land and subsurface co-variability and dynamics. Our studies include acquisition and integration of various measurements, including point-based, surface-based geophysical, and remote sensing datasets These data have been collected during a series of campaigns at the NGEE Barrow, AK site along transects that traverse a range of hydrological and geomorphological conditions, including low- to high- centered polygons and drained thaw lake basins. In this study, we describe the use of galvanic-coupled electrical resistance tomography (ERT), capacitively-coupled resistivity (CCR) , permafrost cores, above-ground orthophotography, and digital elevation model (DEM) to (1) explore complementary nature and trade-offs between characterization resolution, spatial extent and accuracy of different datasets; (2) develop inversion approaches to quantify permafrost characteristics (such as ice content, ice wedge frequency, and presence of unfrozen deep layer) and (3) identify correspondences between permafrost and land surface properties (such as water inundation, topography, and vegetation). In terms of methods, we developed a 1D-based direct search approach to estimate electrical conductivity distribution while allowing exploration of multiple solutions and prior information in a flexible way. Application of the method to the Barrow datasets reveals the relative information content of each dataset for characterizing permafrost properties, which shows features variability from below one meter length scales to large trends over more than a kilometer. Further, we used Pole- and Kite-based low-altitude aerial photography with inferred DEM, as well as DEM from LiDAR dataset, to quantify land-surface properties and their co-variability with the subsurface properties. Comparison of the above- and below-ground characterization information indicate that while some permafrost characteristics correspond with changes in hydrogeomorphological expressions, others features show more complex linkages with landscape properties. Overall, our results indicate that remote sensing data, point-scale measurements and surface geophysical measurements enable the identification of regional zones having similar relations between subsurface and land surface properties. Identification of such zonation and associated permafrost-land surface properties can be used to guide investigations of carbon cycling processes and for model parameterization. JF - American Geophysical Union Fall Meeting AU - Dafflon, B AU - Hubbard, S S AU - Ulrich, C AU - Peterson, J E AU - Wu, Y AU - Wainwright, H M AU - Gangodagamage, C AU - Kholodov, A L AU - Kneafsey, T J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract C43A EP - 0664 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566814671?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Quantifying+Arctic+terrestrial+environment+behaviors+using+geophysical%2C+point-scale+and+remote+sensing+data&rft.au=Dafflon%2C+B%3BHubbard%2C+S+S%3BUlrich%2C+C%3BPeterson%2C+J+E%3BWu%2C+Y%3BWainwright%2C+H+M%3BGangodagamage%2C+C%3BKholodov%2C+A+L%3BKneafsey%2C+T+J%3BAnonymous&rft.aulast=Dafflon&rft.aufirst=B&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Intrashell delta (super 13) C SIMS measurements in the cultured planktic foraminifer Orbulina universa AN - 1542646918; 2014-051739 AB - In this study, we present experimental data from the planktic foraminifer Orbulina universa cultured in laboratory experiments. We demonstrate that the delta (super 13) C of calcite precipitated in (super 13) C-labeled seawater for 24 h can be resolved and accurately measured using Secondary Ion Mass Spectrometry (SIMS). Specimens maintained at 20 degrees C were transferred from ambient seawater (delta (super 13) C (sub DIC) = +1.3 ppm) into (super 13) C-enriched seawater with delta (super 13) C (sub DIC) = +51.5 ppm and elevated [Ba] for 24 h. Specimens were then transferred into ambient seawater with elevated [ (super 87) Sr] for 6-9 h of calcification, followed by a transfer back into unlabelled ambient seawater until gametogenesis. This technique produced O. universa shells with calcite layers of distinct geochemical signatures. We quantify the spatial positions of trace element labels in the shells using laser ablation ICP-MS depth profiling. Using fragments from the same shells, we quantify intrashell delta (super 13) C (sub calcite) using SIMS with a 6 or 8 mu m spot (+ or -1.1 ppm (2 SD)). Measured delta (super 13) C (sub calcite) values in ambient O. universa shell layers are within 2 ppm of predicted delta (super 13) C (sub calcite) values. In (super 13) C-labeled bands of calcite, 6 mu m SIMS spot measurements are within 2 ppm of predicted delta (super 13) C (sub calcite) values, whereas 8 mu m SIMS spots yield values that are intermediate between predicted values for ambient and spiked calcite. The spatial agreement between trace element and carbon isotope data suggest that delta (super 13) C, Ba, and Sr tracers are incorporated synchronously into shell calcite, within the resolution of the two analytical techniques. These results demonstrate the ability of SIMS delta (super 13) C measurements to resolve 6 mu m features in foraminifer shell calcite, and highlight the potential of this technique for addressing questions about foraminifer ecology, biomineralization, and paleoceanography. JF - American Geophysical Union Fall Meeting AU - Vetter, L AU - Kozdon, R AU - Valley, J W AU - Mora, C I AU - Spero, H J AU - Anonymous Y1 - 2013/12// PY - 2013 DA - December 2013 SP - Abstract PP23B EP - 1955 PB - American Geophysical Union, Washington, DC VL - 2013 KW - 10:Invertebrate paleontology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542646918?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Intrashell+delta+%28super+13%29+C+SIMS+measurements+in+the+cultured+planktic+foraminifer+Orbulina+universa&rft.au=Vetter%2C+L%3BKozdon%2C+R%3BValley%2C+J+W%3BMora%2C+C+I%3BSpero%2C+H+J%3BAnonymous&rft.aulast=Vetter&rft.aufirst=L&rft.date=2013-12-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2013 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Characterization of IHSS Pony Lake fulvic acid dissolved organic matter by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and fluorescence spectroscopy AN - 1502296045; 2014-012816 AB - We present the extensive characterization of Antarctic Pony Lake (PL) dissolved organic matter (DOM), an International Humic Substance Society (IHSS) fulvic acid (FA) reference standard, using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) and excitation-emission matrix fluorescence spectroscopy (EEMS). PLFA is the first reference standard available through IHSS derived solely from a microbial source. A number of factors differentiate PLFA from other IHSS standards, including source material, geographic location, sunlight exposure, freeze-thaw conditions, and other in situ environmental influences. ESI FT-ICR MS and EEMS were used to compare the PLFA microbial DOM compositional signature with the IHSS Suwannee River (SR) FA, a standard frequently studied for environmental DOM analysis. Although C (sub c) H (sub h) O (sub o) N (sub n) S (sub s) (n=0, 1, or 2 and s=0 or 1) constituents were present in both IHSS samples, PLFA contained more N and S molecular species, whereas SRFA was dominated by C (sub c) H (sub h) O (sub o) compounds. Proteinaceous character was detected with both methods, in greater abundance for PLFA, which we attributed to its microbial source material and labile, potentially more reactive nature than SRFA. Characterization from both analytical techniques resulted in complementary data that reinforce the importance of PLFA as an IHSS reference standard that should be utilized for other microbiological environmental DOM comparisons. Abstract Copyright (2013) Elsevier, B.V. JF - Organic Geochemistry AU - D'Andrilli, Juliana AU - Foreman, Christine M AU - Marshall, Alan G AU - McKnight, Diane M Y1 - 2013/12// PY - 2013 DA - December 2013 SP - 19 EP - 28 PB - Elsevier VL - 65 SN - 0146-6380, 0146-6380 KW - lakes KW - data processing KW - mass spectra KW - techniques KW - analysis KW - fast Fourier transforms KW - Fourier analysis KW - spectra KW - geochemistry KW - hydrology KW - surface water KW - solutes KW - mass spectroscopy KW - East Antarctica KW - hydrochemistry KW - organic compounds KW - organic acids KW - limnology KW - humic substances KW - Antarctica KW - Pony Lake KW - fulvic acids KW - spectroscopy KW - aquatic environment KW - 02B:Hydrochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1502296045?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Organic+Geochemistry&rft.atitle=Characterization+of+IHSS+Pony+Lake+fulvic+acid+dissolved+organic+matter+by+electrospray+ionization+Fourier+transform+ion+cyclotron+resonance+mass+spectrometry+and+fluorescence+spectroscopy&rft.au=D%27Andrilli%2C+Juliana%3BForeman%2C+Christine+M%3BMarshall%2C+Alan+G%3BMcKnight%2C+Diane+M&rft.aulast=D%27Andrilli&rft.aufirst=Juliana&rft.date=2013-12-01&rft.volume=65&rft.issue=&rft.spage=95&rft.isbn=&rft.btitle=&rft.title=Solid+Earth+%28SE%2C+Gottingen%29&rft.issn=18699510&rft_id=info:doi/ L2 - http://www.sciencedirect.com/science/journal/01466380 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2014-01-01 N1 - Number of references - 66 N1 - Document feature - illus. incl. 3 tables N1 - Last updated - 2014-02-27 N1 - SubjectsTermNotLitGenreText - analysis; Antarctica; aquatic environment; data processing; East Antarctica; fast Fourier transforms; Fourier analysis; fulvic acids; geochemistry; humic substances; hydrochemistry; hydrology; lakes; limnology; mass spectra; mass spectroscopy; organic acids; organic compounds; Pony Lake; solutes; spectra; spectroscopy; surface water; techniques DO - http://dx.doi.org/10.1016/j.orggeochem.2013.09.013 ER - TY - JOUR T1 - Acoustic emission and microslip precursors to stick-slip failure in sheared granular material AN - 1529794032; 2014-036693 AB - We investigate the physics of laboratory earthquake precursors in a biaxial shear configuration. We conduct laboratory experiments at room temperature and humidity in which we shear layers of glass beads under applied normal loads of 2-8 MPa and with shearing rates of 5-10 mu m/s. We show that above approximately 3 MPa load, acoustic emission (AE), and shear microfailure (microslip) precursors exhibit an exponential increase in rate of occurrence, culminating in stick-slip failure. Precursors take place where the material is in a critical state-still modestly dilating, yet while the macroscopic frictional strength is no longer increasing. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Geophysical Research Letters AU - Johnson, P A AU - Ferdowsi, B AU - Kaproth, B M AU - Scuderi, M AU - Griffa, M AU - Carmeliet, J AU - Guyer, R A AU - Le Bas, P Y AU - Trugman, D T AU - Marone, C Y1 - 2013/11/16/ PY - 2013 DA - 2013 Nov 16 SP - 5627 EP - 5631 PB - American Geophysical Union, Washington, DC VL - 40 IS - 21 SN - 0094-8276, 0094-8276 KW - precursors KW - experimental studies KW - risk management KW - geologic hazards KW - stick-slip KW - laboratory studies KW - granular materials KW - seismicity KW - earthquake prediction KW - natural hazards KW - microseisms KW - risk assessment KW - tectonics KW - earthquakes KW - acoustical emissions KW - seismotectonics KW - 19:Seismology KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1529794032?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Acoustic+emission+and+microslip+precursors+to+stick-slip+failure+in+sheared+granular+material&rft.au=Johnson%2C+P+A%3BFerdowsi%2C+B%3BKaproth%2C+B+M%3BScuderi%2C+M%3BGriffa%2C+M%3BCarmeliet%2C+J%3BGuyer%2C+R+A%3BLe+Bas%2C+P+Y%3BTrugman%2C+D+T%3BMarone%2C+C&rft.aulast=Johnson&rft.aufirst=P&rft.date=2013-11-16&rft.volume=40&rft.issue=21&rft.spage=5627&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1002%2F2013GL057848 L2 - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291944-8007/issues LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 34 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2014-05-29 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - acoustical emissions; earthquake prediction; earthquakes; experimental studies; geologic hazards; granular materials; laboratory studies; microseisms; natural hazards; precursors; risk assessment; risk management; seismicity; seismotectonics; stick-slip; tectonics DO - http://dx.doi.org/10.1002/2013GL057848 ER - TY - JOUR T1 - Formation of crystalline PuO (sub 2+x) .nH (sub 2) O nanoparticles upon sorption of Pu(V,VI) onto hematite AN - 1464891993; 2013-091174 AB - It has been recognized that natural aquatic colloids can readily sorb actinide elements, including plutonium, whose behavior is complicated by its multiple valence states and the possibility of redox reactions under environmental conditions. In this paper, the sorption and surface-mediated redox transformations of hexavalent plutonium on synthetic well-characterized hematite colloids are studied in a series of batch sorption experiments. The variation in the kinetics of the Pu-hematite interactions, Pu-L (sub 3) -XAFS, and HRTEM over a broad range of total concentrations of Pu have been studied in an attempt to define the molecular-level speciation of Pu. The surface-mediated slow reduction of Pu(V/VI) results in the formation of crystalline nanoparticles of PuO (sub 2+x) .nH (sub 2) O approximately 1.5 nm in size at [Pu] (sub tot) > or =10 (super -9) M. This result is confirmed independently by HRTEM images of Pu-containing particles and through the identification in the EXAFS of a Pu neighbor shell at 3.8Aa. The formation of such nanoparticles potentially influences the colloid-mediated transport of Pu in the subsurface environment because of the very slow leaching of Pu from the hematite colloids. Abstract Copyright (2013) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Romanchuk, Anna Yu AU - Kalmykov, Stepan N AU - Egorov, Alexander V AU - Zubavichus, Yan V AU - Shiryaev, Andrey A AU - Batuk, Olga N AU - Conradson, Steven D AU - Pankratov, Denis A AU - Presnyakov, Igor A Y1 - 2013/11/15/ PY - 2013 DA - 2013 Nov 15 SP - 29 EP - 40 PB - Elsevier, New York, NY VL - 121 SN - 0016-7037, 0016-7037 KW - sorption KW - experimental studies KW - colloidal materials KW - X-ray diffraction data KW - TEM data KW - plutonium oxide KW - chemical reactions KW - hematite KW - EXAFS data KW - oxides KW - crystallization KW - valency KW - crystal chemistry KW - chemical composition KW - nanoparticles KW - Eh KW - chemical fractionation KW - 01C:Mineralogy of non-silicates KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464891993?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Quaternary+Research&rft.atitle=Isotopic+tracers+of+paleohydrologic+change+in+large+lakes+of+the+Bolivian+Altiplano&rft.au=Placzek%2C+Christa+J%3BQuade%2C+Jay%3BPatchett%2C+PJonathan&rft.aulast=Placzek&rft.aufirst=Christa&rft.date=2011-01-01&rft.volume=75&rft.issue=1&rft.spage=231&rft.isbn=&rft.btitle=&rft.title=Quaternary+Research&rft.issn=00335894&rft_id=info:doi/10.1016%2Fj.yqres.2010.08.004 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 72 N1 - PubXState - NY N1 - Document feature - illus. incl. 2 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-12-05 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - chemical composition; chemical fractionation; chemical reactions; colloidal materials; crystal chemistry; crystallization; Eh; EXAFS data; experimental studies; hematite; nanoparticles; oxides; plutonium oxide; sorption; TEM data; valency; X-ray diffraction data DO - http://dx.doi.org/10.1016/j.gca.2013.07.016 ER - TY - JOUR T1 - MCNP6 Study of Spallation Products from 500 MeV p + super(136)Xe AN - 1671598625; 20459914 AB - MCNP6 [1] is used in various applications involving reactions induced by neutrons and other low-energy projectiles, but also may be applied to particle- and heavy-ion collisions at relativistic energies. An improved version of the Cascade-Exciton Model (CEM) as implemented in the code CEM03.03 [2], is the main "workhorse" (event generator) used by MCNP6 as its default option to describe reactions induced by nucleons, pions, and photons at energies up to several GeV. It is critical that it be able to describe such reactions as well as possible; therefore, it is extensively validated and verified against available experimental data and calculations by other models (see, e.g., [3] and references therein). So far, for proton-induced reactions at intermediate energies, MCNP6 has been compared mostly with different particle spectra measured from various reactions as well as with yields of products from heavy actinide and from relatively light nuclei-targets [3] and much less with data on isotope-production yields from reactions on intermediate nuclei with mass numbersAaround and above -100, which are usually much more difficult to calculate with any models (see [4] and references therein). To remedy this deficiency, we tested MCNP6 using CEM03.03 against the product yields from the 500 MeV p + super(136)Xe interactions measured recently at GSI in inverse kinematics [5]. The production of final residual nuclei in such reactions is of great interest for a number of applied and academic problems related to transmutation of nuclear wastes, radioactive beam facilities, propagation of cosmic radiation, understanding the reaction mechanisms leading to the production of highly-excited nuclei and to dissipation of kinetic energy in internal excitation energy of the nucleus and in the de-excitation process of such hot nuclei, to name just a few [5]. JF - Transactions of the American Nuclear Society AU - Mashnik, Stepan G AD - Los Alamos National Laboratory, XCP-3, MS A 143, Los Alamos, NM 87545 mashnik@lanl.gov Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 11 EP - 13 PB - American Nuclear Society, Inc. VL - 109 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Energy use KW - Inverse kinematics KW - Mathematical models KW - Energy (nuclear) KW - Reactions (nuclear) KW - Remedies KW - Nuclei KW - Projectiles UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671598625?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=MCNP6+Study+of+Spallation+Products+from+500+MeV+p+%2B+super%28136%29Xe&rft.au=Mashnik%2C+Stepan+G&rft.aulast=Mashnik&rft.aufirst=Stepan&rft.date=2013-11-14&rft.volume=109&rft.issue=&rft.spage=11&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-01 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - Comparison of ENDF71x and ENDF70 Using ICSBEP Criticality Benchmarks in MCNP6 AN - 1671586957; 20460171 AB - The Nuclear Data Team at Los Alamos National Laboratory (LANL) has recently prepared [1, 2] an ACE-format, continuous-energy neutron data library called ENDF71x. This library is based on ENDF/B-VII.1 [3] and includes data for 423 nuclides at 7 temperatures: 0.1, 250, 293.6, 600, 900, 1200, and 2500 K. ENDF71x expands upon its ENDF/B-VII.0-based predecessor, ENDF70 [4], by adding 32 new evaluations and 2 new temperatures. The ENDF71x library is scheduled for release, through RSICC, with the first production version of MCNP6 [5]. JF - Transactions of the American Nuclear Society AU - Gardiner, Steven J AU - Conlin, Jeremy Lloyd AU - Kahler, A C AU - Parsons, D Kent AD - Los Alamos National Laboratory, Los Alamos, NM, 87544 sgardiner@lanl.gov Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 874 EP - 877 PB - American Nuclear Society, Inc. VL - 109 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclides KW - Libraries KW - Benchmarks UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671586957?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Comparison+of+ENDF71x+and+ENDF70+Using+ICSBEP+Criticality+Benchmarks+in+MCNP6&rft.au=Gardiner%2C+Steven+J%3BConlin%2C+Jeremy+Lloyd%3BKahler%2C+A+C%3BParsons%2C+D+Kent&rft.aulast=Gardiner&rft.aufirst=Steven&rft.date=2013-11-14&rft.volume=109&rft.issue=&rft.spage=874&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-01 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - Godiva IV Critical Assembly Machine Reassembly and Startup AN - 1567091422; 20460177 AB - Godiva IV is a fast burst assembly with approximately 65 kg of highly enriched uranium fuel alloyed with 1.5% molybdenum for strength.[1] Experiments were conducted with Godiva IV by the Los Alamos Critical Experiment Facility (LACEF) team at Technical Area (TA) 18 at Los Alamos National Laboratory from 1967-2004. In 2004, operations were stopped and in 2005 the fuel was disassembled and packaged for shipping.[2] JF - Transactions of the American Nuclear Society AU - Goda, J AU - Hayes, D AU - Sanchez, R AD - Los Alamos National Laboratory: P.O. Box 1663, Los Alamos, NM, 87544 jgoda@lanl.gov Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 893 EP - 896 PB - American Nuclear Society, Inc. VL - 109 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Bursting KW - Critical experiments KW - Uranium KW - Molybdenum base alloys KW - Fuels KW - Nuclear fuels KW - Assembly KW - Dismantling UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1567091422?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Godiva+IV+Critical+Assembly+Machine+Reassembly+and+Startup&rft.au=Goda%2C+J%3BHayes%2C+D%3BSanchez%2C+R&rft.aulast=Goda&rft.aufirst=J&rft.date=2013-11-14&rft.volume=109&rft.issue=&rft.spage=893&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-01 N1 - Last updated - 2014-11-05 ER - TY - JOUR T1 - MCNP Accomplishments for the Nuclear Criticality Safety Program AN - 1567086856; 20460179 AB - MCNP is a mature and robust continuous-energy Monte Carlo code. It has been used to perform high-fidelity benchmark calculations for cross sections, calculations for critical experiment design, analyses for criticality safety problems, and many other applications since the 1970s. For the past decade, the production release of the code has been MCNP5 [1], with over 10,000 copies distributed throughout the world. The next major version of the code, MCNP6.1 [2], is, as of the time of this writing, being finalized for release and distribution by RSICC. This paper summarizes progress during FY 2013 in the development and support of MCNP for the US DOE Nuclear Criticality Safety Program (NCSP). Activities and accomplishments are summarized for the following: MCNP6.1 capabilities and status, verification and validation testing at LANL, user support and training for NCSP, current methods research and development efforts, progress on sensitivities and uncertainty analysis capabilities, and the future issues with MCNP. JF - Transactions of the American Nuclear Society AU - Kiedrowski, Brian C AU - Brown, Forrest B AU - Bull, Jeffrey S AD - Los Alamos National Laboratory, P.O. Box 1663 MS A143, Los Alamos, NM 87545 Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 901 EP - 904 PB - American Nuclear Society, Inc. VL - 109 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Design engineering KW - Critical experiments KW - Nuclear safety KW - Reproduction KW - Benchmarking KW - Cross sections KW - Nuclear engineering KW - Mathematical analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1567086856?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=MCNP+Accomplishments+for+the+Nuclear+Criticality+Safety+Program&rft.au=Kiedrowski%2C+Brian+C%3BBrown%2C+Forrest+B%3BBull%2C+Jeffrey+S&rft.aulast=Kiedrowski&rft.aufirst=Brian&rft.date=2013-11-14&rft.volume=109&rft.issue=&rft.spage=901&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-01 N1 - Last updated - 2014-11-05 ER - TY - JOUR T1 - Fission Fragments Produced from Proton Irradiation of Thorium Between 40 and 200 MeV AN - 1567085191; 20459915 AB - The cross sections for the formation of five residual radionuclides ( super(72)Se, super(97)Zr, super(112)Pd, super(125)Sb, and super(147)Nb) from 40to 200-MeV proton irradiation of thorium have been measured and are reported. The atomic masses of these fragments span the expected mass distribution of radionuclides formed by fission of the target nucleus. Especially in mass regions corresponding to transitions between different relaxation mechanisms employed by available models, these data are expected to be useful to the improvement of high-energy transport codes. The predictions of the event generators incorporated into the latest release of the Monte Carlo N-Particle code (MCNP6) are compared with data measured in this work in the hope that these results may be useful to the continued process of code verification and validation in MCNP6. JF - Transactions of the American Nuclear Society AU - Engle, Jonathan W AU - Mashnik, Stepan G AU - Weidner, J W AU - Fassbender, Michael E AU - Bach, Hong T AU - Ullmann, John L AU - Couture, Aaron J AU - Bitteker, Leo J AU - Gulley, Mark S AU - John, Kevin D AU - Birnbaum, Eva R AU - Nortier, Francois M AD - Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM, 87544 jwengle@lanl.gov Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 14 EP - 17 PB - American Nuclear Society, Inc. VL - 109 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear fission KW - Computer simulation KW - Thorium KW - Transport KW - Mass distribution KW - Fragments KW - Proton irradiation KW - Cross sections UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1567085191?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Fission+Fragments+Produced+from+Proton+Irradiation+of+Thorium+Between+40+and+200+MeV&rft.au=Engle%2C+Jonathan+W%3BMashnik%2C+Stepan+G%3BWeidner%2C+J+W%3BFassbender%2C+Michael+E%3BBach%2C+Hong+T%3BUllmann%2C+John+L%3BCouture%2C+Aaron+J%3BBitteker%2C+Leo+J%3BGulley%2C+Mark+S%3BJohn%2C+Kevin+D%3BBirnbaum%2C+Eva+R%3BNortier%2C+Francois+M&rft.aulast=Engle&rft.aufirst=Jonathan&rft.date=2013-11-14&rft.volume=109&rft.issue=&rft.spage=14&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-01 N1 - Last updated - 2014-11-05 ER - TY - JOUR T1 - MCNP6 Cosmic & Terrestrial Background Particle Fluxes - Release ? AN - 1567059725; 20460258 AB - The galactic cosmic-ray (GCR) source option[1] was implemented in the all-energy, all-particle transport code MCNP62 in 2010. Earlier in 2013, we reported on Release 2 of the MCNP6 cosmic and terrestrial background flux file (background.dat).[3] In this paper, we report on enhancements that have been made to the modeling and simulation of these spectra, identified as Release 3 of the background.dat file, which is read and sampled by MCNP6 whenever a user invokes the background source option. JF - Transactions of the American Nuclear Society AU - McKinney, G W AU - Wilcox, T A AU - McMath, G E AU - Lines, N A AD - Los Alamos National Laboratory, P.O. Box 1663 MS C921, Los Alamos, NM, 87545 Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 1194 EP - 1197 PB - American Nuclear Society, Inc. VL - 109 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Computer simulation KW - Transport KW - Spectra KW - Fluxes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1567059725?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=MCNP6+Cosmic+%26amp%3B+Terrestrial+Background+Particle+Fluxes+-+Release+%3F&rft.au=McKinney%2C+G+W%3BWilcox%2C+T+A%3BMcMath%2C+G+E%3BLines%2C+N+A&rft.aulast=McKinney&rft.aufirst=G&rft.date=2013-11-14&rft.volume=109&rft.issue=&rft.spage=1194&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-01 N1 - Last updated - 2014-11-05 ER - TY - JOUR T1 - Summary of Recent Los Alamos Contributions to the Nuclear Criticality Safety Program AN - 1566837107; 20460182 AB - The Nuclear Criticality Safety Program (NCSP) provides sustainable expert leadership, direction, and the technical infrastructure necessary to develop, maintain, and disseminate essential technical tools, training, and data required to support safe, efficient fissionable material operations within the United States (U.S.) Department of Energy (DOE). The NCSP includes five technical program elements: Analytical Methods, Information Preservation and Dissemination, Integral Experiments, Nuclear Data, and Training and Education. Los Alamos National Laboratory (LANL) contributes to each of these five NCSP technical program elements. This paper will summarize recent LANL contributions to the NCSP. JF - Transactions of the American Nuclear Society AU - Little, Robert C AU - Myers, William L AU - Kahler, A C AU - Favorite, Jeffrey A AU - Margevicius, Robert W AD - Los Alamos National Laboratory, PO Box 1663, Los Alamos NM 87544, rcl@lanl.gov Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 911 EP - 914 PB - American Nuclear Society, Inc. VL - 109 SN - 0003-018X, 0003-018X KW - Sustainability Science Abstracts; Health & Safety Science Abstracts KW - Infrastructure KW - USA KW - Education KW - Training KW - Safety KW - Sustainable development KW - Nuclear energy KW - USA, New Mexico, Los Alamos KW - H 8000:Radiation Safety/Electrical Safety KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566837107?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Summary+of+Recent+Los+Alamos+Contributions+to+the+Nuclear+Criticality+Safety+Program&rft.au=Little%2C+Robert+C%3BMyers%2C+William+L%3BKahler%2C+A+C%3BFavorite%2C+Jeffrey+A%3BMargevicius%2C+Robert+W&rft.aulast=Little&rft.aufirst=Robert&rft.date=2013-11-14&rft.volume=109&rft.issue=&rft.spage=911&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-09-01 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Infrastructure; Education; Training; Safety; Sustainable development; Nuclear energy; USA; USA, New Mexico, Los Alamos ER - TY - JOUR T1 - Testing an Energy Dependent Albedo Capability for MCNP AN - 1562675780; 20460281 AB - The objective of nuclear safeguards is to detect diversions of significant quantities of nuclear materials, and to deter such diversions through risk of early detection. [1] In order to provide the International Atomic Energy Agency (IAEA) with an instrument capable of directly measuring plutonium content in spent fuel assemblies, as well as the diversion of pins from these assemblies, the Next Generation Safeguard Initiative (NGSI) Spent Fuel project sponsored by the U.S Department of Energy (DOE) was started in March of 2009. [2] Goals of the project include development and/or calibration of Non-Destructive Assay (NDA) instruments using well-characterized or Working Standard assemblies. The definition of a Working Standard assembly is an assembly that applies NDA and/or Destructive Analysis (DA) data to a "base" simulation of the assembly to improve the accuracy of the simulation. One of the difficulties with developing a Working Standard has been simulating such a starting or "base" point for the assembly with limited operational data. The technique described in this paper establishes a path through which modifications to MCNP burnup simulations can be more easily applied in the creation of Working Standards. JF - Transactions of the American Nuclear Society AU - Fensin, M L AU - McKinney, A B AU - Hendricks, J S AD - Los Alamos National Laboratory, NEN-5, Los Alamos, NM 87545, mfensin@lanl.gov Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 1285 EP - 1289 PB - American Nuclear Society, Inc. VL - 109 SN - 0003-018X, 0003-018X KW - Health & Safety Science Abstracts KW - Plutonium KW - Fuels KW - Albedo KW - Energy KW - Nuclear fuels KW - Radioactive materials KW - Simulation KW - Nuclear energy KW - Measuring instruments KW - International standardization KW - H 8000:Radiation Safety/Electrical Safety UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1562675780?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthsafetyabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Testing+an+Energy+Dependent+Albedo+Capability+for+MCNP&rft.au=Fensin%2C+M+L%3BMcKinney%2C+A+B%3BHendricks%2C+J+S&rft.aulast=Fensin&rft.aufirst=M&rft.date=2013-11-14&rft.volume=109&rft.issue=&rft.spage=1285&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-09-01 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Plutonium; Energy; Albedo; Fuels; Radioactive materials; Nuclear fuels; Simulation; Nuclear energy; Measuring instruments; International standardization ER - TY - JOUR T1 - A 500-kiloton airburst over Chelyabinsk and an enhanced hazard from small impactors AN - 1469629325; 2013-098164 JF - Nature (London) AU - Brown, P G AU - Assink, J D AU - Astiz, L AU - Blaauw, R AU - Boslough, M B AU - Borovicka, J AU - Brachet, N AU - Brown, D AU - Campbell-Brown, M AU - Ceranna, L AU - Cooke, W AU - de Groot-Hedlin, C AU - Drob, D P AU - Edwards, W AU - Evers, L G AU - Garces, M AU - Gill, J AU - Hedlin, M AU - Kingery, A AU - Laske, G AU - Le Pichon, A AU - Mialle, P AU - Moser, D E AU - Saffer, A AU - Silber, E AU - Smets, P AU - Spalding, R E AU - Spurny, P AU - Tagliaferri, E AU - Uren, D AU - Weryk, R J AU - Whitaker, R AU - Krzeminski, Z Y1 - 2013/11/14/ PY - 2013 DA - 2013 Nov 14 SP - 238 EP - 241 PB - Macmillan Journals, London VL - 503 IS - 7475 SN - 0028-0836, 0028-0836 KW - overpressure KW - power law KW - geologic hazards KW - asteroids KW - explosions KW - damage KW - bolides KW - atmosphere KW - Russian Federation KW - frequency KW - impacts KW - airbursts KW - Chelyabinsk Meteorite KW - models KW - meteors KW - brightness KW - meteorites KW - Chelyabinsk Russian Federation KW - Commonwealth of Independent States KW - natural hazards KW - nuclear explosions KW - energy KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469629325?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Buckman+wellfield+and+its+relation+to+groundwater+beneath+Los+Alamos+National+Laboratory&rft.au=Vesselinov%2C+Velimir+V%3BKatzman%2C+Danny%3BBroxton%2C+David&rft.aulast=Vesselinov&rft.aufirst=Velimir&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=24&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://www.nature.com/nature/index.html LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 27 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2013-12-20 N1 - CODEN - NATUAS N1 - SubjectsTermNotLitGenreText - airbursts; asteroids; atmosphere; bolides; brightness; Chelyabinsk Meteorite; Chelyabinsk Russian Federation; Commonwealth of Independent States; damage; energy; explosions; frequency; geologic hazards; impacts; meteorites; meteors; models; natural hazards; nuclear explosions; overpressure; power law; Russian Federation DO - http://dx.doi.org/10.1038/nature12741 ER - TY - CPAPER T1 - Materials for Exploring New Electronic and Optical Behaviors in SWCNT Systems T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490518166; 6253443 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Duque, Juan AU - Hamilton, Chris AU - Gupta, Gautam AU - Doorn, Stephen Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Chemical engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490518166?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Materials+for+Exploring+New+Electronic+and+Optical+Behaviors+in+SWCNT+Systems&rft.au=Duque%2C+Juan%3BHamilton%2C+Chris%3BGupta%2C+Gautam%3BDoorn%2C+Stephen&rft.aulast=Duque&rft.aufirst=Juan&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Construction of Human Respiratory Platform for Lung Organ In Vitro Study T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490516272; 6249103 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Huang, Jen-Huang AU - Goumas, Andrew AU - Arefin, Ayesha AU - Iyer, Rashi Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Organs UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490516272?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Construction+of+Human+Respiratory+Platform+for+Lung+Organ+In+Vitro+Study&rft.au=Huang%2C+Jen-Huang%3BGoumas%2C+Andrew%3BArefin%2C+Ayesha%3BIyer%2C+Rashi&rft.aulast=Huang&rft.aufirst=Jen-Huang&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Polyelectrolyte Thin Films As a Platform for pH-Responsive Lipid Membranes T2 - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AN - 1490508993; 6251126 JF - 2013 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2013) AU - Singh, Saurabh AU - Junghans, Ann AU - Majewski, Jaroslaw Y1 - 2013/11/03/ PY - 2013 DA - 2013 Nov 03 KW - Lipid membranes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490508993?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.atitle=Polyelectrolyte+Thin+Films+As+a+Platform+for+pH-Responsive+Lipid+Membranes&rft.au=Singh%2C+Saurabh%3BJunghans%2C+Ann%3BMajewski%2C+Jaroslaw&rft.aulast=Singh&rft.aufirst=Saurabh&rft.date=2013-11-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2013%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2013/webprogram/meeting2013-11-03.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - JOUR T1 - Characteristics of pebble- and cobble-sized clasts along the Curiosity Rover traverse from Bradbury Landing to Rocknest AN - 1524609648; 2014-032013 AB - We have assessed the characteristics of clasts along Curiosity's traverse to shed light on the processes important in the genesis, modification, and transportation of surface materials. Pebble- to cobble-sized clasts at Bradbury Landing, and subsequently along Curiosity's traverse to Yellowknife Bay, reflect a mixing of two end-member transport mechanisms. The general clast population likely represents material deposited via impact processes, including meteorite fragments, ejecta from distant craters, and impactites consisting of shocked and shock-melted materials from within Gale Crater, which resulted predominantly in larger, angular clasts. A subset of rounded pebble-sized clasts has likely been modified by intermittent alluvial or fluvial processes. The morphology of this rounded clast population indicates that water was a more important transporting agent here than at other Mars sites that have been studied in situ. Finally, we identified populations of basalt clasts and porphyritic clasts of undetermined composition by their morphologic and textural characteristics; basalts are confirmed by geochemical data provided by ChemCam. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Journal of Geophysical Research: Planets AU - Yingst, R A AU - Kah, L C AU - Palucis, M AU - Williams, R M E AU - Garvin, J AU - Bridges, J C AU - Bridges, N AU - Deen, R G AU - Farmer, J AU - Gasnault, O AU - Goetz, W AU - Hamilton, V E AU - Hipkin, V AU - Jensen, J K AU - King, P L AU - Koefoed, A AU - Le Mouelic, S P AU - Madsen, M B AU - Mangold, N AU - Martinez-Frias, J AU - Maurice, S AU - McCartney, E M AU - Newsom, H AU - Pariser, O AU - Sautter, V H AU - Wiens, R C Y1 - 2013/11// PY - 2013 DA - November 2013 SP - 2361 EP - 2380 PB - Wiley-Blackwell for American Geophysical Union, Washington, DC VL - 118 IS - 11 SN - 2169-9097, 2169-9097 KW - volcanic rocks KW - impact features KW - igneous rocks KW - pebbles KW - Mars KW - Rocknest landing site KW - landing sites KW - meteorites KW - transport KW - Curiosity Rover KW - basalts KW - sediments KW - ChemCam KW - interpretation KW - chemical composition KW - Yellowknife Bay KW - sediment transport KW - clastic sediments KW - textures KW - sedimentation KW - Bradbury landing site KW - clasts KW - porphyry KW - fluvial sedimentation KW - ejecta KW - terrestrial planets KW - cobbles KW - planets KW - fluvial features KW - impact craters KW - alluvium KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1524609648?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research%3A+Planets&rft.atitle=Characteristics+of+pebble-+and+cobble-sized+clasts+along+the+Curiosity+Rover+traverse+from+Bradbury+Landing+to+Rocknest&rft.au=Yingst%2C+R+A%3BKah%2C+L+C%3BPalucis%2C+M%3BWilliams%2C+R+M+E%3BGarvin%2C+J%3BBridges%2C+J+C%3BBridges%2C+N%3BDeen%2C+R+G%3BFarmer%2C+J%3BGasnault%2C+O%3BGoetz%2C+W%3BHamilton%2C+V+E%3BHipkin%2C+V%3BJensen%2C+J+K%3BKing%2C+P+L%3BKoefoed%2C+A%3BLe+Mouelic%2C+S+P%3BMadsen%2C+M+B%3BMangold%2C+N%3BMartinez-Frias%2C+J%3BMaurice%2C+S%3BMcCartney%2C+E+M%3BNewsom%2C+H%3BPariser%2C+O%3BSautter%2C+V+H%3BWiens%2C+R+C&rft.aulast=Yingst&rft.aufirst=R&rft.date=2013-11-01&rft.volume=118&rft.issue=11&rft.spage=2361&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research%3A+Planets&rft.issn=21699097&rft_id=info:doi/10.1002%2F2013JE004435 L2 - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%292169-9100 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Document feature - illus. incl. 3 tables N1 - Last updated - 2015-02-19 N1 - SubjectsTermNotLitGenreText - alluvium; basalts; Bradbury landing site; ChemCam; chemical composition; clastic sediments; clasts; cobbles; Curiosity Rover; ejecta; fluvial features; fluvial sedimentation; igneous rocks; impact craters; impact features; interpretation; landing sites; Mars; meteorites; pebbles; planets; porphyry; Rocknest landing site; sediment transport; sedimentation; sediments; terrestrial planets; textures; transport; volcanic rocks; Yellowknife Bay DO - http://dx.doi.org/10.1002/2013JE004435 ER - TY - JOUR T1 - High-temperature neutron diffraction study of deuterated brucite AN - 1492588811; 2014-007720 AB - To study the structural behavior of brucite at high temperature, we conducted in situ neutron diffraction experiments of a deuterated brucite powder sample, Mg(OD) (sub 2) , in the temperature range 313-583 K. The sample was stable up to 553 K, above which it started to decompose into periclase (MgO) and D (sub 2) O vapor. Rietveld analyses of the obtained data were performed using both single-site and three-site split-atom hydrogen models. Our results show that with increasing temperature, unit-cell parameter c increases at a rate approximately 7.7 times more rapidly than a. This large anisotropy of thermal expansion is primarily due to rapid increase in the interlayer thickness along the c-axis on heating. The amplitudes of thermal vibration for Mg, O, and D increase linearly with increasing temperature; however, the rate of the increase for the lighter D is much larger. In addition, D vibrates anisotropically with a higher magnitude within the (001) plane, as confirmed by our first-principles phonon calculations. On heating, the interatomic distances between a given D and its associated O and D from the adjacent [MgO (sub 6) ] layer increase, whereas the O-D bond length decreases. This behavior suggests weakened D...O and D...D interlayer interactions but strengthened O-D bonding with increasing temperature. Copyright 2013 Springer-Verlag Berlin Heidelberg JF - Physics and Chemistry of Minerals AU - Xu, Hongwu AU - Zhao, Yusheng AU - Hickmott, Donald D AU - Lane, Nina J AU - Vogel, Sven C AU - Zhang, Jianzhong AU - Daemen, Luke L Y1 - 2013/11// PY - 2013 DA - November 2013 SP - 799 EP - 810 PB - Springer-Verlag, Berlin - New York VL - 40 IS - 10 SN - 0342-1791, 0342-1791 KW - mineral interlayer KW - cell dimensions KW - isotopes KW - crystal structure KW - bonding KW - Rietveld refinement KW - stable isotopes KW - thermal expansion KW - temperature KW - brucite KW - hydrogen KW - neutron diffraction data KW - oxides KW - heating KW - lattice parameters KW - deuterium KW - crystal chemistry KW - high temperature KW - 01C:Mineralogy of non-silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492588811?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Differentiation+among+multiple+sources+of+anthropogenic+nitrate+in+Mortandad+Canyon%2C+Pajarito+Plateau%2C+using+dual+stable+isotope+systematics&rft.au=Perkins%2C+George+B%3BLarson%2C+Toti+E%3BLongmire%2C+Patrick+A%3BHeikoop%2C+Jeffrey+M%3BFessenden-Rahn%2C+Julianna%3BRearick%2C+Michael+S%3BFabryka-Martin%2C+June+T%3BChrystal%2C+Abbey+E%3BDale%2C+Michael%3BSimmons%2C+Ardyth+M&rft.aulast=Perkins&rft.aufirst=George&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=19&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://www.springerlink.com/content/100449/?p=e597e977f1914094b3810f7e67f0a453&pi=0 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2014-01-01 N1 - Number of references - 40 N1 - Document feature - illus. N1 - SuppNotes - Based on Publisher-supplied data N1 - Last updated - 2014-01-30 N1 - CODEN - PCMIDU N1 - SubjectsTermNotLitGenreText - bonding; brucite; cell dimensions; crystal chemistry; crystal structure; deuterium; heating; high temperature; hydrogen; isotopes; lattice parameters; mineral interlayer; neutron diffraction data; oxides; Rietveld refinement; stable isotopes; temperature; thermal expansion DO - http://dx.doi.org/10.1007/s00269-013-0614-4 ER - TY - JOUR T1 - Double-difference elastic-waveform inversion with prior information for time-lapse monitoring AN - 1477832474; 2014-004405 AB - Quantitative time-lapse seismic monitoring can provide crucial information for enhanced oil recovery, geologic carbon storage, and enhanced geothermal systems. Recently developed double-difference elastic-waveform inversion has the potential to quantitatively monitor reservoirs using seismic reflection data. Because the approximate location of a reservoir or a target monitoring region is usually known, we incorporated this knowledge as prior information into double-difference elastic-waveform inversion. Using numerical examples of synthetic time-lapse models, we found that our new method can quantitatively monitor the changes of elastic properties within reservoirs. Therefore, the double-difference elastic-waveform inversion with prior information on the location of a monitoring region is a promising tool for quantitatively monitoring reservoir properties' hanges. JF - Geophysics AU - Zhang, Zhigang AU - Huang, Lianjie Y1 - 2013/11// PY - 2013 DA - November 2013 SP - R259 EP - R273 PB - Society of Exploration Geophysicists, Tulsa, OK VL - 78 IS - 6 SN - 0016-8033, 0016-8033 KW - monitoring KW - carbon sequestration KW - numerical models KW - elastic properties KW - seismic anomalies KW - geophysical methods KW - data processing KW - inverse problem KW - enhanced recovery KW - elastic waves KW - waveforms KW - seismic methods KW - models KW - time-lapse methods KW - velocity KW - time domain analysis KW - reservoir properties KW - interpretation KW - faults KW - fault zones KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1477832474?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysics&rft.atitle=Double-difference+elastic-waveform+inversion+with+prior+information+for+time-lapse+monitoring&rft.au=Zhang%2C+Zhigang%3BHuang%2C+Lianjie&rft.aulast=Zhang&rft.aufirst=Zhigang&rft.date=2013-11-01&rft.volume=78&rft.issue=6&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysics&rft.issn=00168033&rft_id=info:doi/10.1190%2Fgeo2012-0527.1 L2 - http://library.seg.org/journal/gpysa7 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States N1 - Date revised - 2014-01-01 N1 - Number of references - 30 N1 - PubXState - OK N1 - Document feature - illus. incl. sects. N1 - Last updated - 2014-01-16 N1 - CODEN - GPYSA7 N1 - SubjectsTermNotLitGenreText - carbon sequestration; data processing; elastic properties; elastic waves; enhanced recovery; fault zones; faults; geophysical methods; interpretation; inverse problem; models; monitoring; numerical models; reservoir properties; seismic anomalies; seismic methods; time domain analysis; time-lapse methods; velocity; waveforms DO - http://dx.doi.org/10.1190/geo2012-0527.1 ER - TY - JOUR T1 - A new optimization approach to energy network modeling: anthropogenic CO sub(2) capture coupled with enhanced oil recovery AN - 1468380971; 18815958 AB - SUMMARY To meet next generation energy needs such as wind- and solar-generated electricity, enhanced oil recovery (EOR), CO sub(2) capture and storage (CCS), and biofuels, the US will have to construct tens to hundreds of thousands of kilometers of new transmission lines and pipelines. Energy network models are central to optimizing these energy resources, including how best to produce, transport, and deliver energy-related products such as oil, natural gas, electricity, and CO sub(2). Consequently, understanding how to model new transmission lines and pipelines is central to this process. However, current energy models use simplifying assumptions for deploying pipelines and transmission lines, leading to the design of more costly and inefficient energy networks. In this paper, we introduce a two-stage optimization approach for modeling CCS infrastructure. We show how CO sub(2) pipelines with discrete capacities can be 'linearized' without loss of information and accuracy, therefore allowing necessarily complex energy models to be solved. We demonstrate the new approach by designing a CCS network that collects large volumes of anthropogenic CO sub(2) (up to 45 million tonnes of CO sub(2) per year) from ethylene production facilities and delivers the CO sub(2) to depleted oil fields to stimulate recovery through EOR. Utilization of anthropogenic CO sub(2) has great potential to jumpstart commercial-scale CCS while simultaneously reducing the carbon footprint of domestic oil production. Model outputs illustrate the engineering challenge and spatial extent of CCS infrastructure, as well as the costs (or profits) of deploying CCS technology. We show that the new linearized approach is able to offer insights that other network approaches cannot reveal and how the approach can change how we develop future energy systems including transporting massive volumes of shale gas and biofuels as well as electricity transmission for wind and solar energy. Published 2012. This article is a U.S. Government work and is in the public domain in the USA. Next generation energy needs-such as unconventional gas, biofuels, wind and solar energy, and CO sub(2) capture and storage (CCS) will require tens to hundreds of thousands of kilometers of new transmission lines and pipelines. We present a new two-stage optimization approach for modeling large-scale energy networks. We demonstrate the approach using CCS infrastructure. Specifically, we design infrastructure to capture anthropogenic CO sub(2) from ethylene production, transport the CO sub(2) in a dedicated pipeline network, and store the CO sub(2) in the subsurface while stimulating oil production through enhanced oil recovery. JF - International Journal of Energy Research AU - Middleton, Richard S AD - Los Alamos National Laboratory, Earth and Environmental Sciences, Los Alamos, NM, USA. Y1 - 2013/11// PY - 2013 DA - November 2013 SP - 1794 EP - 1810 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 37 IS - 14 SN - 0363-907X, 0363-907X KW - Oceanic Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Sustainability Science Abstracts KW - CO sub(2) capture and storage (CCS) KW - enhanced oil recovery (EOR) KW - pipeline optimization KW - energy network modeling KW - climate change policy KW - SimCCS KW - Fuel technology KW - Anthropogenic factors KW - Electricity KW - Oil production KW - Ethene KW - Infrastructure KW - Oil recovery KW - Pipelines KW - Solar energy KW - Natural gas KW - Storage KW - USA KW - Wind energy KW - Energy KW - Energy resources KW - Solar power KW - Carbon dioxide KW - Oil and gas production KW - Biofuels KW - Technology KW - Q2 09405:Oil and gas KW - M3 1010:Issues in Sustainable Development KW - O 4060:Pollution - Environment UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1468380971?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Journal+of+Energy+Research&rft.atitle=A+new+optimization+approach+to+energy+network+modeling%3A+anthropogenic+CO+sub%282%29+capture+coupled+with+enhanced+oil+recovery&rft.au=Middleton%2C+Richard+S&rft.aulast=Middleton&rft.aufirst=Richard&rft.date=2013-11-01&rft.volume=37&rft.issue=14&rft.spage=1794&rft.isbn=&rft.btitle=&rft.title=International+Journal+of+Energy+Research&rft.issn=0363907X&rft_id=info:doi/10.1002%2Fer.2993 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-01 N1 - Last updated - 2016-09-29 N1 - SubjectsTermNotLitGenreText - Energy resources; Solar power; Anthropogenic factors; Oil recovery; Electricity; Pipelines; Oil production; Carbon dioxide; Ethene; Fuel technology; Natural gas; Infrastructure; Storage; Wind energy; Energy; Solar energy; Biofuels; Oil and gas production; Technology; USA DO - http://dx.doi.org/10.1002/er.2993 ER - TY - JOUR T1 - Range structure analysis: unveiling the internal structure of species' ranges AN - 1458535218; 18785849 AB - Assessing risks of local extinction and shifts in species ranges are fundamental tasks in ecology and conservation. Most studies have focused either on the border of species' range or on complex spatiotemporal dynamics of populations within the spatial distribution of species. The internal properties of species ranges, however, have received less attention due to a general lack of simple tools. We propose a novel approach within a metapopulation framework to study species ranges based on simple mathematical rules. We formulate and test a model of population fluctuations through space to identify key factors that regulate population density. We propose that spatial variability in species abundance reflects the interaction between temporal variability in population dynamics and the spatial variability of population parameters. This approach, that we call range structure analysis, integrates temporal and spatial properties to diagnose how each parameter contributes to species occupancy throughout its geographic range. JF - Theoretical Ecology AU - Samaniego, Horacio AU - Marquet, Pablo A AD - Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA, horacio@ecoinformatica.cl Y1 - 2013/11// PY - 2013 DA - November 2013 SP - 419 EP - 426 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 6 IS - 4 SN - 1874-1738, 1874-1738 KW - Ecology Abstracts KW - Mathematical models KW - Extinction KW - Spatial distribution KW - Abundance KW - Population density KW - Conservation KW - Population dynamics KW - Metapopulations KW - D 04030:Models, Methods, Remote Sensing UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1458535218?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Aqueous+geochemistry+and+environmental+fate+of+uranium+in+the+Espanola+Basin%2C+New+Mexico&rft.au=Linhoff%2C+Benjamin%3BLongmire%2C+Patrick+A%3BRearick%2C+Michael+S%3BPerkins%2C+George+B%3BWiman%2C+Stephen%3BSiegel%2C+Malcolm%3BMcQuillan%2C+Dennis&rft.aulast=Linhoff&rft.aufirst=Benjamin&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=15&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Number of references - 66 N1 - Last updated - 2016-03-17 N1 - SubjectsTermNotLitGenreText - Mathematical models; Spatial distribution; Extinction; Abundance; Population density; Conservation; Population dynamics; Metapopulations DO - http://dx.doi.org/10.1007/s12080-013-0177-5 ER - TY - CPAPER T1 - Advanced Simulation Capability for Environmental Management User Release and Current Plans T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490523676; 6248359 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Dixon, Paul AU - Freshley, Mark AU - Scheibe, Timothy AU - Moulton, J AU - Hubbard, Susan AU - Finsterle, Stefan AU - Steefel, Carl AU - Seitz, Roger AU - Marble, Justin Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Simulation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490523676?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Advanced+Simulation+Capability+for+Environmental+Management+User+Release+and+Current+Plans&rft.au=Dixon%2C+Paul%3BFreshley%2C+Mark%3BScheibe%2C+Timothy%3BMoulton%2C+J%3BHubbard%2C+Susan%3BFinsterle%2C+Stefan%3BSteefel%2C+Carl%3BSeitz%2C+Roger%3BMarble%2C+Justin&rft.aulast=Dixon&rft.aufirst=Paul&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Evaluation of Costs and Methods for Treating Water Extracted During Carbon Storage Using Produced Water Quality Data T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490519715; 6248472 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Sullivan, Enid AU - Pawar, Rajesh AU - Chu, Shaoping Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Carbon sequestration UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490519715?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Evaluation+of+Costs+and+Methods+for+Treating+Water+Extracted+During+Carbon+Storage+Using+Produced+Water+Quality+Data&rft.au=Sullivan%2C+Enid%3BPawar%2C+Rajesh%3BChu%2C+Shaoping&rft.aulast=Sullivan&rft.aufirst=Enid&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - A Record of Uranium-Series Transport in Fractured, Unsaturated Tuff at Nopal I, Sierra Pena Blanca, Mexico T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490518240; 6248355 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Goldstein, Steven AU - Denton, Joanna AU - Murrell, Michael AU - Nunn, Andrew AU - Hinrichs, Kimberly AU - Amato, Ronald Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Mexico UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490518240?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=A+Record+of+Uranium-Series+Transport+in+Fractured%2C+Unsaturated+Tuff+at+Nopal+I%2C+Sierra+Pena+Blanca%2C+Mexico&rft.au=Goldstein%2C+Steven%3BDenton%2C+Joanna%3BMurrell%2C+Michael%3BNunn%2C+Andrew%3BHinrichs%2C+Kimberly%3BAmato%2C+Ronald&rft.aulast=Goldstein&rft.aufirst=Steven&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=8&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Conditions and Processes Affecting Radionuclide Transport at Yucca Mountain, Nevada T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490517677; 6248354 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Simmons, Ardyth AU - Neymark, Leonid Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - USA, Nevada UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490517677?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Conditions+and+Processes+Affecting+Radionuclide+Transport+at+Yucca+Mountain%2C+Nevada&rft.au=Simmons%2C+Ardyth%3BNeymark%2C+Leonid&rft.aulast=Simmons&rft.aufirst=Ardyth&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Geochemical Analogues to Transport Features and Processes of a Mined Geologic Repository T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490517344; 6248356 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Simmons, Ardyth AU - Stuckless, John Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490517344?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Geochemical+Analogues+to+Transport+Features+and+Processes+of+a+Mined+Geologic+Repository&rft.au=Simmons%2C+Ardyth%3BStuckless%2C+John&rft.aulast=Simmons&rft.aufirst=Ardyth&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Sans Investigation of Pore Structure in Natural and Engineered Materials for Nuclear Waste Repository Systems T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490512986; 6247468 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Ding, Mei AU - Hartl, Monika AU - Xu, Hongwu AU - Hjelm, Rex AU - Wang, Yifeng AU - Jove-Colon, Carlos Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Radioactive wastes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490512986?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Sans+Investigation+of+Pore+Structure+in+Natural+and+Engineered+Materials+for+Nuclear+Waste+Repository+Systems&rft.au=Ding%2C+Mei%3BHartl%2C+Monika%3BXu%2C+Hongwu%3BHjelm%2C+Rex%3BWang%2C+Yifeng%3BJove-Colon%2C+Carlos&rft.aulast=Ding&rft.aufirst=Mei&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Evaluation of Geologic Options for Disposal of High-Level Radioactive Waste Using a Gis Database T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490511076; 6246447 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Perry, Frank AU - Dobson, Patrick AU - Kelley, Richard Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Geographic information systems UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490511076?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Evaluation+of+Geologic+Options+for+Disposal+of+High-Level+Radioactive+Waste+Using+a+Gis+Database&rft.au=Perry%2C+Frank%3BDobson%2C+Patrick%3BKelley%2C+Richard&rft.aulast=Perry&rft.aufirst=Frank&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Redox Chemistry of Aquifer Systems in the Presence of Residual Organic Drilling Fluids T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490509602; 6247488 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Longmire, Patrick AU - Dale, Michael AU - Granzow, Kim AU - Yanicak, Stephen Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Drilling fluids UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490509602?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Redox+Chemistry+of+Aquifer+Systems+in+the+Presence+of+Residual+Organic+Drilling+Fluids&rft.au=Longmire%2C+Patrick%3BDale%2C+Michael%3BGranzow%2C+Kim%3BYanicak%2C+Stephen&rft.aulast=Longmire&rft.aufirst=Patrick&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Thermal Decomposition of Polyhalite: A Mineral Relevant to Salt Repository T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490505415; 6246452 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Xu, Hongwu AU - Bai, Jianming Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Thermal decomposition UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490505415?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Thermal+Decomposition+of+Polyhalite%3A+A+Mineral+Relevant+to+Salt+Repository&rft.au=Xu%2C+Hongwu%3BBai%2C+Jianming&rft.aulast=Xu&rft.aufirst=Hongwu&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Hydrous Mineral Phase Transformations at Elevated Temperatures T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490505231; 6246453 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Caporuscio, Florie AU - Cheshire, Michael AU - Boukhalfa, Hakim Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Temperature effects UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490505231?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=W-Os+isotope+systematics+in+IVB+iron+meteorites&rft.au=Wittig%2C+N%3BHumayun%2C+M%3BAnonymous&rft.aulast=Wittig&rft.aufirst=N&rft.date=2011-01-01&rft.volume=75&rft.issue=3&rft.spage=2168&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Changing Carbon Dynamics across a Retrogressive Thaw Slump Soil Chronosequence in Northwestern Alaska T2 - 2013 Annual Meeting & Exposition of the Geological Society of America AN - 1490504859; 6246643 JF - 2013 Annual Meeting & Exposition of the Geological Society of America AU - Mora, C AU - Jensen, A AU - Crosby, B AU - Lohse, K Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - USA, Alaska UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1490504859?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.atitle=Changing+Carbon+Dynamics+across+a+Retrogressive+Thaw+Slump+Soil+Chronosequence+in+Northwestern+Alaska&rft.au=Mora%2C+C%3BJensen%2C+A%3BCrosby%2C+B%3BLohse%2C+K&rft.aulast=Mora&rft.aufirst=C&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+%26+Exposition+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-30 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Processing and Mechanical Behavior of Unalloyed Plutonium T2 - 52nd Annual Conference of Metallurgists (COM 2013) AN - 1450167850; 6244778 JF - 52nd Annual Conference of Metallurgists (COM 2013) AU - Farrow, Adam AU - Knapp, Cameron AU - Korzekwa, Deniece AU - Saleh, Tarik AU - Knapp, Trevor Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Plutonium KW - Mechanical properties UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1450167850?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=52nd+Annual+Conference+of+Metallurgists+%28COM+2013%29&rft.atitle=Processing+and+Mechanical+Behavior+of+Unalloyed+Plutonium&rft.au=Farrow%2C+Adam%3BKnapp%2C+Cameron%3BKorzekwa%2C+Deniece%3BSaleh%2C+Tarik%3BKnapp%2C+Trevor&rft.aulast=Farrow&rft.aufirst=Adam&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=52nd+Annual+Conference+of+Metallurgists+%28COM+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://www.programmaster.org/PM/PM.nsf/SessionSheetView?OpenForm&ParentUNID=1C64FCABE1A1E644852576C30062C9E9 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-10-31 N1 - Last updated - 2013-11-13 ER - TY - CPAPER T1 - Metallurgical Studies with the HIPPO Beam-line at LANSCE T2 - 52nd Annual Conference of Metallurgists (COM 2013) AN - 1450167627; 6244942 JF - 52nd Annual Conference of Metallurgists (COM 2013) AU - Vogel, Sven AU - Tomida, Toshiro AU - Brown, Donald AU - Okuniewski, Maria AU - Reiche, Matt Y1 - 2013/10/27/ PY - 2013 DA - 2013 Oct 27 KW - Metallurgy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1450167627?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=52nd+Annual+Conference+of+Metallurgists+%28COM+2013%29&rft.atitle=Metallurgical+Studies+with+the+HIPPO+Beam-line+at+LANSCE&rft.au=Vogel%2C+Sven%3BTomida%2C+Toshiro%3BBrown%2C+Donald%3BOkuniewski%2C+Maria%3BReiche%2C+Matt&rft.aulast=Vogel&rft.aufirst=Sven&rft.date=2013-10-27&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=52nd+Annual+Conference+of+Metallurgists+%28COM+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://www.programmaster.org/PM/PM.nsf/SessionSheetView?OpenForm&ParentUNID=1C64FCABE1A1E644852576C30062C9E9 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-10-31 N1 - Last updated - 2013-11-13 ER - TY - JOUR T1 - The global embedded interface formulation for interfacial mass transfer within a volume tracking framework AN - 1475524808; 18810050 AB - Interfacial flow with mass transfer is particularly challenging to compute because the position of the interface between the fluids and the interface physics needs to be predicted as part of the solution of the flow equations. In addition, the discontinuity in fluid density, viscosity and species concentration at the interface present additional numerical challenges. In this work, we extend our balanced-force volume-tracking algorithm for modeling interfacial flow with surface tension force [10] to include mass transfer. We propose a global embedded interface formulation to model the interfacial conditions of the species concentration at an interface in thermodynamic equilibrium. To verify our formulation, we perform simulations of a pure diffusion problem with species concentration discontinuity at the interface. Then we present two and three-dimensional simulations of droplets rising by buoyancy with mass transfer. JF - Computers & Fluids AU - Francois, M M AU - Carlson, N N AD - Computational Physics and Methods Group (CCS-2), Los Alamos National Laboratory, Los Alamos, NM 87545, United States, mmfran@lanl.gov Y1 - 2013/10/25/ PY - 2013 DA - 2013 Oct 25 SP - 102 EP - 114 PB - Elsevier B.V., P.O. Box 800 Kidlington Oxford OX5 1DX United Kingdom VL - 87 SN - 0045-7930, 0045-7930 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Mathematical models KW - Surface tension KW - Interfaces KW - Computers KW - Density KW - Mass Transfer KW - Algorithms KW - Population density KW - Tracking KW - Model Studies KW - Surface Tension KW - Viscosity KW - Thermodynamic equilibrium KW - Mass transfer KW - Buoyancy KW - SW 0810:General KW - Q2 09182:Methods and instruments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1475524808?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Fluids&rft.atitle=The+global+embedded+interface+formulation+for+interfacial+mass+transfer+within+a+volume+tracking+framework&rft.au=Francois%2C+M+M%3BCarlson%2C+N+N&rft.aulast=Francois&rft.aufirst=M&rft.date=2013-10-25&rft.volume=87&rft.issue=&rft.spage=102&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Fluids&rft.issn=00457930&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-09-01 N1 - Last updated - 2016-02-04 N1 - SubjectsTermNotLitGenreText - Surface tension; Thermodynamic equilibrium; Mathematical models; Population density; Mass transfer; Tracking; Viscosity; Surface Tension; Density; Computers; Interfaces; Algorithms; Mass Transfer; Buoyancy; Model Studies ER - TY - JOUR T1 - Modeling dynamic triggering of tectonic tremor using a brittle-ductile friction model AN - 1492589689; 2014-006150 AB - We study the physics of dynamically triggered tectonic tremor by applying a brittle-ductile friction model in which we conceptualize the tremor source as a rigid block subject to driving and frictional forces. To simulate dynamic triggering of tremor, we apply a stress perturbation that mimics the surface waves of remote earthquakes. The tectonic and wave perturbation stresses define a phase space that demonstrates that both the timing and amplitude of the dynamic perturbations control the fundamental characteristics of triggered tremor. Tremor can be triggered instantaneously or with a delayed onset if the dynamic perturbation significantly alters the frictional state of the tremor source. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Geophysical Research Letters AU - Trugman, Daniel T AU - Daub, Eric G AU - Guyer, Robert A AU - Johnson, Paul A Y1 - 2013/10/16/ PY - 2013 DA - 2013 Oct 16 SP - 5075 EP - 5079 PB - American Geophysical Union, Washington, DC VL - 40 IS - 19 SN - 0094-8276, 0094-8276 KW - upper crust KW - precursors KW - lithosphere KW - friction KW - ductility KW - seismicity KW - brittleness KW - tectonics KW - earthquakes KW - causes KW - seismotectonics KW - crust KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492589689?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Modeling+dynamic+triggering+of+tectonic+tremor+using+a+brittle-ductile+friction+model&rft.au=Trugman%2C+Daniel+T%3BDaub%2C+Eric+G%3BGuyer%2C+Robert+A%3BJohnson%2C+Paul+A&rft.aulast=Trugman&rft.aufirst=Daniel&rft.date=2013-10-16&rft.volume=40&rft.issue=19&rft.spage=5075&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1002%2Fgrl.50981 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 40 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2014-01-30 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - brittleness; causes; crust; ductility; earthquakes; friction; lithosphere; precursors; seismicity; seismotectonics; tectonics; upper crust DO - http://dx.doi.org/10.1002/grl.50981 ER - TY - JOUR T1 - Greenland surface mass balance as simulated by the Community Earth System Model; Part I, Model evaluation and 1850-2005 results AN - 1700097134; 2015-071610 AB - The modeling of the surface mass balance (SMB) of the Greenland Ice Sheet (GIS) requires high-resolution models in order to capture the observed large gradients in the steep marginal areas. Until now, global climate models have not been considered suitable to model ice sheet SMB owing to model biases and insufficient resolution. This study analyzes the GIS SMB simulated for the period 1850?2005 by the Community Earth System Model (CESM), which includes a new ice sheet component with multiple elevation classes for SMB calculations. The model is evaluated against observational data and output from the regional model Regional Atmospheric Climate Model version 2 (RACMO2). Because of a lack of major climate biases, a sophisticated calculation of snow processes (including surface albedo evolution) and an adequate downscaling technique, CESM is able to realistically simulate GIS surface climate and SMB. CESM SMB agrees reasonably well with in situ data from 475 locations (r = 0.80) and output from RACMO2 (r = 0.79). The simulated mean SMB for 1960-2005 is 359 + or - 120 Gt yr (super -1) in the range of estimates from regional climate models. The simulated seasonal mass variability is comparable with mass observations from the Gravity Recovery and Climate Experiment (GRACE), with synchronous annual maximum (May) and minimum (August-September) and similar amplitudes of the seasonal cycle. CESM is able to simulate the bands of precipitation maxima along the southeast and northwest margins, but absolute precipitation rates are underestimated along the southeastern margin and overestimated in the high interior. The model correctly simulates the major ablation areas. Total refreezing represents 35% of the available liquid water (the sum of rain and melt). JF - Journal of Climate AU - Vizcaino, Miren AU - Lipscomb, William H AU - Sacks, William J AU - van Angelen, Jan H AU - Wouters, Bert AU - van den Broeke, Michiel R Y1 - 2013/10// PY - 2013 DA - October 2013 SP - 7793 EP - 7812 PB - American Meteorological Society, Boston, MA VL - 26 IS - 20 SN - 0894-8755, 0894-8755 KW - albedo KW - snow cover KW - Quaternary KW - Arctic region KW - Greenland ice sheet KW - ice cover KW - GRACE KW - satellite methods KW - Holocene KW - ice sheets KW - climate change KW - modern KW - Cenozoic KW - Greenland KW - mass balance KW - ice KW - snow KW - climate effects KW - seasonal variations KW - glacial geology KW - upper Holocene KW - remote sensing KW - 24:Quaternary geology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700097134?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Climate&rft.atitle=Greenland+surface+mass+balance+as+simulated+by+the+Community+Earth+System+Model%3B+Part+I%2C+Model+evaluation+and+1850-2005+results&rft.au=Vizcaino%2C+Miren%3BLipscomb%2C+William+H%3BSacks%2C+William+J%3Bvan+Angelen%2C+Jan+H%3BWouters%2C+Bert%3Bvan+den+Broeke%2C+Michiel+R&rft.aulast=Vizcaino&rft.aufirst=Miren&rft.date=2013-10-01&rft.volume=26&rft.issue=20&rft.spage=7793&rft.isbn=&rft.btitle=&rft.title=Journal+of+Climate&rft.issn=08948755&rft_id=info:doi/10.1175%2FJCLI-D-12-00615.1 L2 - http://journals.ametsoc.org/loi/clim LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from American Meteorological Society, Boston, MA, United States N1 - Date revised - 2015-01-01 N1 - PubXState - MA N1 - SuppNotes - Based on Publisher-supplied data N1 - Last updated - 2015-07-30 N1 - SubjectsTermNotLitGenreText - albedo; Arctic region; Cenozoic; climate change; climate effects; glacial geology; GRACE; Greenland; Greenland ice sheet; Holocene; ice; ice cover; ice sheets; mass balance; modern; Quaternary; remote sensing; satellite methods; seasonal variations; snow; snow cover; upper Holocene DO - http://dx.doi.org/10.1175/JCLI-D-12-00615.1 ER - TY - JOUR T1 - Implementation and initial evaluation of the Glimmer Community Ice Sheet Model in the Community Earth System Model AN - 1700096956; 2015-071607 AB - The Glimmer Community Ice Sheet Model (Glimmer-CISM) has been implemented in the Community Earth System Model (CESM). Glimmer-CISM is forced by a surface mass balance (SMB) computed in multiple elevation classes in the CESM land model and downscaled to the ice sheet grid. Ice sheet evolution is governed by the shallow-ice approximation with thermomechanical coupling and basal sliding. This paper describes and evaluates the initial model implementation for the Greenland Ice Sheet (GIS). The ice sheet model was spun up using the SMB from a coupled CESM simulation with preindustrial forcing. The model's sensitivity to three key ice sheet parameters was explored by running an ensemble of 100 GIS simulations to quasi equilibrium and ranking each simulation based on multiple diagnostics. With reasonable parameter choices, the steady-state GIS geometry is broadly consistent with observations. The simulated ice sheet is too thick and extensive, however, in some marginal regions where the SMB is anomalously positive. The top-ranking simulations were continued using surface forcing from CESM simulations of the twentieth century (1850-2005) and twenty-first century (2005-2100, with RCP8.5 forcing). In these simulations the GIS loses mass, with a resulting global-mean sea level rise of 16 mm during 1850-2005 and 60 mm during 2005-2100. This mass loss is caused mainly by increased ablation near the ice sheet margin, offset by reduced ice discharge to the ocean. Projected sea level rise is sensitive to the initial geometry, showing the importance of realistic geometry in the spun-up ice sheet. JF - Journal of Climate AU - Lipscomb, William H AU - Fyke, Jeremy G AU - Vizcaino, Miren AU - Sacks, William J AU - Wolfe, Jon AU - Vertenstein, Mariana AU - Craig, Anthony AU - Kluzek, Erik AU - Lawrence, David M Y1 - 2013/10// PY - 2013 DA - October 2013 SP - 7352 EP - 7371 PB - American Meteorological Society, Boston, MA VL - 26 IS - 19 SN - 0894-8755, 0894-8755 KW - albedo KW - snow cover KW - numerical models KW - Arctic region KW - Greenland ice sheet KW - ice cover KW - GRACE KW - satellite methods KW - ice sheets KW - climate change KW - Greenland KW - mass balance KW - ice KW - snow KW - climate effects KW - glacial geology KW - remote sensing KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700096956?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Climate&rft.atitle=Implementation+and+initial+evaluation+of+the+Glimmer+Community+Ice+Sheet+Model+in+the+Community+Earth+System+Model&rft.au=Lipscomb%2C+William+H%3BFyke%2C+Jeremy+G%3BVizcaino%2C+Miren%3BSacks%2C+William+J%3BWolfe%2C+Jon%3BVertenstein%2C+Mariana%3BCraig%2C+Anthony%3BKluzek%2C+Erik%3BLawrence%2C+David+M&rft.aulast=Lipscomb&rft.aufirst=William&rft.date=2013-10-01&rft.volume=26&rft.issue=19&rft.spage=7352&rft.isbn=&rft.btitle=&rft.title=Journal+of+Climate&rft.issn=08948755&rft_id=info:doi/10.1175%2FJCLI-D-12-00557.1 L2 - http://journals.ametsoc.org/loi/clim LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from American Meteorological Society, Boston, MA, United States N1 - Date revised - 2015-01-01 N1 - PubXState - MA N1 - SuppNotes - Based on Publisher-supplied data N1 - Last updated - 2015-07-30 N1 - SubjectsTermNotLitGenreText - albedo; Arctic region; climate change; climate effects; glacial geology; GRACE; Greenland; Greenland ice sheet; ice; ice cover; ice sheets; mass balance; numerical models; remote sensing; satellite methods; snow; snow cover DO - http://dx.doi.org/10.1175/JCLI-D-12-00557.1 ER - TY - JOUR T1 - Prompt Fission Neutron Spectrum Uncertainty Propagation Using Polynomial Chaos Expansion AN - 1671516842; 18638188 AB - The polynomial chaos expansion-stochastic collocation method (PCE-SCM) is demonstrated to be a computationally efficient approachfor propagating nuclear data uncertainties evaluatedfor the prompt fission neutron spectra (PFNS) of n + (235)U and n + (239)Pu fission reactions through two fast neutron critical benchmark experiments. A principal component decomposition of the PFNS covariance matrices yields an efficient representation of the uncertainty in terms of two to four random variables. Both normal and uniform distributions are considered for these random variables, and the random output variables (angular flux and k-eigenvalue) are expressed in terms of Hermite and Legendre chaos expansions, respectively. Tensor product Hermite and Legendre Gauss quadrature sets, respectively, are used to relate the deterministic chaos expansion coefficients to solutions of independent transport k-eigenvalue problems, and the resulting polynomial chaos expansion provides a complete statistical characterization of the uncertainty in the output variables. Direct random sampling of the PFNS followed by repeated solution of the transport problem to create an ensemble of solutions is used to benchmark results obtained from the PCE-SCM implementation. Both direct random sampling and the PCE-SCM implementation yield comparable results where, for the Jezebel and Lady Godiva critical assemblies, the calculated uncertainties in k(eff) resulting from the PFNS propagated uncertainties are found to be of the same order or larger than reported experimental measurement uncertainties, respectively. The PCE-SCM implementation results obtained require orders of magnitude less computational resources compared with the direct random sampling approach. JF - Nuclear Science and Engineering AU - Rising, M E AU - Prinja, A K AU - Talou, P AD - University of New Mexico, Chemical and Nuclear Engineering Department, Albuquerque, New Mexico 87131 mrising@lanl.gov Y1 - 2013/10// PY - 2013 DA - Oct 2013 SP - 188 EP - 203 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 175 IS - 2 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear fission KW - Uncertainty KW - Random sampling KW - Mathematical models KW - Transport KW - Polynomials KW - Chaos theory KW - Mathematical analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671516842?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Glaciology&rft.atitle=Incorporating+arbitrary+basal+topography+in+the+variational+formulation+of+ice-sheet+models&rft.au=Dukowicz%2C+J+K%3BPrice%2C+S+F%3BLipscomb%2C+W+H&rft.aulast=Dukowicz&rft.aufirst=J&rft.date=2011-01-01&rft.volume=57&rft.issue=203&rft.spage=461&rft.isbn=&rft.btitle=&rft.title=Journal+of+Glaciology&rft.issn=00221430&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Number of references - 21 N1 - Last updated - 2015-05-04 ER - TY - JOUR T1 - A framework for estimating stratospheric wind speeds from unknown sources and application to the 2010 December 25 bolide AN - 1464887303; 2013-093561 AB - We present a methodology for infrasonic remote sensing of winds in the stratosphere that does not require discrete ground-truth events. Our method uses measured time delays between arrays of sensors to provide group velocities (referred to here as celerities) and then minimizes the difference between observed and predicted celerities by perturbing an initial atmospheric specification. Because we focus on interarray propagation effects, it is not necessary to simulate the full propagation path from source to receiver. This feature allows us to use a relatively simple forward model that is applicable over short-regional distances. By focusing on stratospheric returns, we show that our non-linear inversion scheme converges much better if the starting model contains a strong stratospheric duct. Using the Horizontal Wind Model (HWM)/Mass Spectrometer Incoherent Scatter (MSISE) empirical climatology as a starting model, we demonstrate that the inversion scheme is robust to large uncertainties in backazimuth, but that uncertainties in the measured trace velocity and celerity require the use of prior constraints to ensure suitable convergence. The inversion of synthetic data, using realistic estimates of measurement error, shows that our scheme will nevertheless improve upon a starting model under most scenarios. The inversion scheme is applied to infrasound data recorded from a large event on 2010 December 25, which is presumed to be a bolide, using data from a nine-element infrasound network in Utah. We show that our recorded data require a stronger zonal wind speed in the stratosphere than is present in the HWM profile, and are more consistent with the Ground-to-Space (G2S) profile. JF - Geophysical Journal International AU - Arrowsmith, Stephen J AU - Marcillo, Omar AU - Drob, Douglas P Y1 - 2013/10// PY - 2013 DA - October 2013 SP - 491 EP - 503 PB - Oxford University Press on behalf of The Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft and the European Geophysical Society VL - 195 IS - 1 SN - 0956-540X, 0956-540X KW - United States KW - technology KW - monitoring KW - bolides KW - atmosphere KW - inverse problem KW - models KW - meteors KW - stratosphere KW - velocity KW - signal-to-noise ratio KW - propagation KW - Utah KW - infrasound KW - algorithms KW - wave dispersion KW - winds KW - instruments KW - arrays KW - acoustical waves KW - remote sensing KW - Comprehensive Test Ban Treaty KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464887303?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Journal+International&rft.atitle=A+framework+for+estimating+stratospheric+wind+speeds+from+unknown+sources+and+application+to+the+2010+December+25+bolide&rft.au=Arrowsmith%2C+Stephen+J%3BMarcillo%2C+Omar%3BDrob%2C+Douglas+P&rft.aulast=Arrowsmith&rft.aufirst=Stephen&rft.date=2013-10-01&rft.volume=195&rft.issue=1&rft.spage=491&rft.isbn=&rft.btitle=&rft.title=Geophysical+Journal+International&rft.issn=0956540X&rft_id=info:doi/10.1093%2Fgji%2Fggt228 L2 - http://www.blackwellpublishing.com/journal.asp?ref=0956-540X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 26 N1 - Document feature - illus. incl. 1 table, geol. sketch maps N1 - Last updated - 2013-12-05 N1 - SubjectsTermNotLitGenreText - acoustical waves; algorithms; arrays; atmosphere; bolides; Comprehensive Test Ban Treaty; infrasound; instruments; inverse problem; meteors; models; monitoring; propagation; remote sensing; signal-to-noise ratio; stratosphere; technology; United States; Utah; velocity; wave dispersion; winds DO - http://dx.doi.org/10.1093/gji/ggt228 ER - TY - JOUR T1 - Application of advanced validation concepts to oxide fuel performance codes: LIFE-4 fast-reactor and FRAPCON thermal-reactor fuel performance codes AN - 1464548291; 18718754 AB - Evolving nuclear energy programs expect to use enhanced modeling and simulation (M&S) capabilities, using multiscale, multiphysics modeling approaches, to reduce both cost and time from the design through the licensing phases. Interest in the development of the multiscale, multiphysics approach has increased in the last decade because of the need for predictive tools for complex interacting processes as a means of eliminating the limited use of empirically based model development. Complex interacting processes cannot be predicted by analyzing each individual component in isolation. In most cases, the mathematical models of complex processes and their boundary conditions are nonlinear. As a result, the solutions of these mathematical models often require high-performance computing capabilities and resources. The use of multiscale, multiphysics (MS/MP) models in conjunction with high-performance computational software and hardware introduces challenges in validating these predictive tools-traditional methodologies will have to be modified to address these challenges. The advanced MS/MP codes for nuclear fuels and reactors are being developed within the Nuclear Energy Advanced Modeling and Simulation (NEAMS) program of the US Department of Energy (DOE)- Nuclear Energy (NE). This paper does not directly address challenges in calibration/validation of MS/MP capabilities because these advanced tools have not yet reached sufficient maturity to support such an investigation. In an earlier paper (Unal et al., 2011), we proposed a methodology that potentially can be used to address these new challenges in the design and licensing of evolving nuclear technology. The main components of the proposed methodology are verification, validation, calibration, and uncertainty quantification. An enhanced calibration concept was introduced and is accomplished through data assimilation. Since advanced MS/MP codes have not yet reached the level of maturity required for a comprehensive validation and calibration exercise, we considered two legacy fuel codes and apply parts of our methodology to these codes to demonstrate the benefits of the new calibration capabilities we recently developed as a part of the proposed framework. This effort does not directly support "born-assessed" validation for advanced MS/MP codes, but is useful to gain insight on legacy modeling deficiencies and to guide and develop recommendations on high and low priority directions for development of advanced codes and advanced experiments, so as to maximize the benefits of advanced validation and uncertainty quantification (VU) efforts involving the next generation of MS/MP code capabilities. This paper discusses the application of advanced validation techniques (sensitivity, calibration, and prediction) to nuclear fuel performance codes FRAPCON (Geelhood et al., 2011 a, b) and LIFE-4 (Boltax et al., 1990). FRAPCON is used to predict oxide fuel behavior in light water reactors. LIFE-4 was developed in the 1980s to predict oxide fuel behavior in fast reactors. We introduce a sensitivity ranking methodology to narrow down the selected parameters for follow-up sensitivity and calibration analyses. We use screening methods with both codes and discuss the results. The number of selected modeling parameters was 61 for FRAPCON and 69 for LIFE-4. The screening study resulted in only 24 parameters of importance in the FRAPCON application, whereas LIFE-4 analysis reduced the set of important modeling parameters from 69 to 35. Sensitivity screening results, combined with post-calibration sensitivity analysis, results in the following ranking of LIFE-4 models for future improvements: fuel creep, fuel thermal conductivity, fission gas transport/release, crack/boundary, and fuel gap conductivity. More data are needed to validate calibrated parameter distributions for future uncertainty quantification studies with LIFE-4. We apply a collection of different VU methodologies to assess the preliminary performance of an advanced fuel code (see Stull, C.J., Williams, B.J., Unal. C. 2012). We summarize our lessons learned from that study in the discussion section to provide a context for issues often encountered in the application of advanced VU methodologies. JF - Nuclear Engineering and Design AU - Unal, C AU - Williams, B J AU - Yacout, A AU - Higdon, D M AD - Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, United States cu@lanl.gov Y1 - 2013/10// PY - 2013 DA - Oct 2013 SP - 102 EP - 128 PB - Elsevier B.V., The Boulevard Kidlington Oxford OX5 1GB United Kingdom VL - 263 SN - 0029-5493, 0029-5493 KW - Mechanical & Transportation Engineering Abstracts (MT); Advanced Polymers Abstracts (EP); Environmental Engineering Abstracts (EN); Composites Industry Abstracts (ED); Engineered Materials Abstracts, Ceramics (EC); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear power generation KW - Nuclear reactors KW - Mathematical models KW - Fuels KW - Calibration KW - Nuclear reactor components KW - Oxides KW - Nuclear engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464548291?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Engineering+and+Design&rft.atitle=Application+of+advanced+validation+concepts+to+oxide+fuel+performance+codes%3A+LIFE-4+fast-reactor+and+FRAPCON+thermal-reactor+fuel+performance+codes&rft.au=Unal%2C+C%3BWilliams%2C+B+J%3BYacout%2C+A%3BHigdon%2C+D+M&rft.aulast=Unal&rft.aufirst=C&rft.date=2013-10-01&rft.volume=263&rft.issue=&rft.spage=102&rft.isbn=&rft.btitle=&rft.title=Nuclear+Engineering+and+Design&rft.issn=00295493&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-01 N1 - Number of references - 15 N1 - Last updated - 2013-12-04 ER - TY - JOUR T1 - Dryland soil microbial communities display spatial biogeographic patterns associated with soil depth and soil parent material AN - 1458541432; 18737171 AB - Biological soil crusts (biocrusts) are common to drylands worldwide. We employed replicated, spatially nested sampling and 16S rRNA gene sequencing to describe the soil microbial communities in three soils derived from different parent material (sandstone, shale, and gypsum). For each soil type, two depths (biocrusts, 0-1 cm; below-crust soils, 2-5 cm) and two horizontal spatial scales (15 cm and 5 m) were sampled. In all three soils, Cyanobacteria and Proteobacteria demonstrated significantly higher relative abundance in the biocrusts, while Chloroflexi and Archaea were significantly enriched in the below-crust soils. Biomass and diversity of the communities in biocrusts or below-crust soils did not differ with soil type. However, biocrusts on gypsum soil harbored significantly larger populations of Actinobacteria and Proteobacteria and lower populations of Cyanobacteria. Numerically dominant operational taxonomic units (OTU; 97% sequence identity) in the biocrusts were conserved across the soil types, whereas two dominant OTUs in the below-crust sand and shale soils were not identified in the gypsum soil. The uniformity with which small-scale vertical community differences are maintained across larger horizontal spatial scales and soil types is a feature of dryland ecosystems that should be considered when designing management plans and determining the response of biocrusts to environmental disturbances. JF - FEMS Microbiology Ecology AU - Steven, Blaire AU - Gallegos-Graves, La Verne AU - Belnap, Jayne AU - Kuske, Cheryl R AD - Bioscience Division. Los Alamos National Laboratory Y1 - 2013/10// PY - 2013 DA - Oct 2013 SP - 101 EP - 113 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 86 IS - 1 SN - 0168-6496, 0168-6496 KW - Environment Abstracts; Ecology Abstracts; Microbiology Abstracts A: Industrial & Applied Microbiology KW - Soil types KW - Archaea KW - Spatial distribution KW - Ecosystems KW - Abundance KW - Management plans KW - Relative abundance KW - Proteobacteria KW - Soil microorganisms KW - Soil KW - Sand KW - gypsum KW - Sandy soils KW - Conserved sequence KW - Sampling KW - Sandstone KW - Microbial activity KW - Biomass KW - Soil depth KW - Cyanobacteria KW - Actinobacteria KW - Taxonomy KW - Shale KW - rRNA 16S KW - ENA 13:Population Planning & Control KW - D 04040:Ecosystem and Ecology Studies KW - A 01400:Soil Microbes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1458541432?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=FEMS+Microbiology+Ecology&rft.atitle=Dryland+soil+microbial+communities+display+spatial+biogeographic+patterns+associated+with+soil+depth+and+soil+parent+material&rft.au=Steven%2C+Blaire%3BGallegos-Graves%2C+La+Verne%3BBelnap%2C+Jayne%3BKuske%2C+Cheryl+R&rft.aulast=Steven&rft.aufirst=Blaire&rft.date=2013-10-01&rft.volume=86&rft.issue=1&rft.spage=101&rft.isbn=&rft.btitle=&rft.title=FEMS+Microbiology+Ecology&rft.issn=01686496&rft_id=info:doi/10.1111%2F1574-6941.12143 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Last updated - 2014-07-24 N1 - SubjectsTermNotLitGenreText - Soil types; Soil depth; Sand; gypsum; Abundance; Conserved sequence; Sampling; Biomass; Shale; rRNA 16S; Soil microorganisms; Soil; Ecosystems; Spatial distribution; Sandstone; Management plans; Sandy soils; Taxonomy; Relative abundance; Microbial activity; Cyanobacteria; Archaea; Actinobacteria; Proteobacteria DO - http://dx.doi.org/10.1111/1574-6941.12143 ER - TY - JOUR T1 - Evaluating theories of drought-induced vegetation mortality using a multimodel-experiment framework AN - 1448221873; 18636223 AB - Model-data comparisons of plant physiological processes provide an understanding of mechanisms underlying vegetation responses to climate. We simulated the physiology of a pinon pine-juniper woodland (Pinus edulis-Juniperus monosperma) that experienced mortality during a 5 yr precipitation-reduction experiment, allowing a framework with which to examine our knowledge of drought-induced tree mortality. We used six models designed for scales ranging from individual plants to a global level, all containing state-of-the-art representations of the internal hydraulic and carbohydrate dynamics of woody plants. Despite the large range of model structures, tuning, and parameterization employed, all simulations predicted hydraulic failure and carbon starvation processes co-occurring in dying trees of both species, with the time spent with severe hydraulic failure and carbon starvation, rather than absolute thresholds per se, being a better predictor of impending mortality. Model and empirical data suggest that limited carbon and water exchanges at stomatal, phloem, and below-ground interfaces were associated with mortality of both species. The model-data comparison suggests that the introduction of a mechanistic process into physiology-based models provides equal or improved predictive power over traditional process-model or empirical thresholds. Both biophysical and empirical modeling approaches are useful in understanding processes, particularly when the models fail, because they reveal mechanisms that are likely to underlie mortality. We suggest that for some ecosystems, integration of mechanistic pathogen models into current vegetation models, and evaluation against observations, could result in a breakthrough capability to simulate vegetation dynamics.Original Abstract: Featured paper: See also the Editorial by McDowell et al JF - New Phytologist AU - McDowell, Nate G AU - Fisher, Rosie A AU - Xu, Chonggang AU - Domec, J C AU - Holttae, Teemu AU - Mackay, DScott AU - Sperry, John S AU - Boutz, Amanda AU - Dickman, Lee AU - Gehres, Nathan AU - Limousin, Jean Marc AU - Macalady, Alison AU - Martinez-Vilalta, Jordi AU - Mencuccini, Maurizio AU - Plaut, Jennifer A AU - Ogee, Jerome AU - Pangle, Robert E AU - Rasse, Daniel P AU - Ryan, Michael G AU - Sevanto, Sanna AU - Waring, Richard H AU - Williams, APark AU - Yepez, Enrico A AU - Pockman, William T AD - Earth and Environmental Sciences Division. Los Alamos National Laboratory Y1 - 2013/10// PY - 2013 DA - Oct 2013 SP - 304 EP - 321 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 200 IS - 2 SN - 0028-646X, 0028-646X KW - Ecology Abstracts KW - Starvation KW - Hydraulics KW - Mortality KW - Data processing KW - Trees KW - Climate KW - Vegetation KW - Pathogens KW - Pinus KW - Models KW - Integration KW - Stomata KW - Carbon KW - Phloem KW - Carbohydrates KW - D 04040:Ecosystem and Ecology Studies UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448221873?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=New+Phytologist&rft.atitle=Evaluating+theories+of+drought-induced+vegetation+mortality+using+a+multimodel-experiment+framework&rft.au=McDowell%2C+Nate+G%3BFisher%2C+Rosie+A%3BXu%2C+Chonggang%3BDomec%2C+J+C%3BHolttae%2C+Teemu%3BMackay%2C+DScott%3BSperry%2C+John+S%3BBoutz%2C+Amanda%3BDickman%2C+Lee%3BGehres%2C+Nathan%3BLimousin%2C+Jean+Marc%3BMacalady%2C+Alison%3BMartinez-Vilalta%2C+Jordi%3BMencuccini%2C+Maurizio%3BPlaut%2C+Jennifer+A%3BOgee%2C+Jerome%3BPangle%2C+Robert+E%3BRasse%2C+Daniel+P%3BRyan%2C+Michael+G%3BSevanto%2C+Sanna%3BWaring%2C+Richard+H%3BWilliams%2C+APark%3BYepez%2C+Enrico+A%3BPockman%2C+William+T&rft.aulast=McDowell&rft.aufirst=Nate&rft.date=2013-10-01&rft.volume=200&rft.issue=2&rft.spage=304&rft.isbn=&rft.btitle=&rft.title=New+Phytologist&rft.issn=0028646X&rft_id=info:doi/10.1111%2Fnph.12465 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-10-01 N1 - Last updated - 2015-04-29 N1 - SubjectsTermNotLitGenreText - Starvation; Mortality; Hydraulics; Data processing; Trees; Climate; Vegetation; Pathogens; Models; Integration; Stomata; Carbon; Phloem; Carbohydrates; Pinus DO - http://dx.doi.org/10.1111/nph.12465 ER - TY - JOUR T1 - Unequivocal determination of site-specific protein disulfide bond reduction potentials by top-down FTICR MS: characterization of the N- and C-terminal redox-active sites in human thioredoxin 1. AN - 1443392864; 24040747 AB - We report the reliable determination of equilibrium protein disulfide bond reduction potentials (E°') by isotope-coded cysteine alkylation coupled with top-down Fourier transform ion cyclotron resonance mass spectrometry (FTICR MS). This technique enables multiple redox-active sites to be characterized simultaneously and unambiguously without the need for proteolysis or site-directed mutagenesis. Our model system was E. coli thioredoxin, and we determined E°' for its CGPC active-site disulfide as -280 mV in accord with literature values. E°' for the homologous disulfide in human thioredoxin 1 (Trx1) was determined as -281 mV, a value considerably more negative than the previously reported -230 mV. We also observed S-glutathionylation of Trx1 and localized that redox modification to Cys72; E°' for the intermolecular disulfide was determined as -186 mV. Intriguingly, that value corresponds to the intracellular glutathione/glutathione disulfide (GSH/GSSG) potential at the redox boundary between cellular differentiation and apoptosis. JF - Analytical chemistry AU - Scotcher, Jenna AU - Bythell, Benjamin J AU - Marshall, Alan G AD - National High Magnetic Field Laboratory, Florida State University , 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States. Y1 - 2013/10/01/ PY - 2013 DA - 2013 Oct 01 SP - 9164 EP - 9172 VL - 85 IS - 19 KW - Disulfides KW - 0 KW - Thioredoxins KW - 52500-60-4 KW - Index Medicus KW - Oxidation-Reduction KW - Mass Spectrometry KW - Humans KW - Escherichia coli KW - Catalytic Domain KW - Disulfides -- chemistry KW - Thioredoxins -- chemistry KW - Cyclotrons KW - Fourier Analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1443392864?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Analytical+chemistry&rft.atitle=Unequivocal+determination+of+site-specific+protein+disulfide+bond+reduction+potentials+by+top-down+FTICR+MS%3A+characterization+of+the+N-+and+C-terminal+redox-active+sites+in+human+thioredoxin+1.&rft.au=Scotcher%2C+Jenna%3BBythell%2C+Benjamin+J%3BMarshall%2C+Alan+G&rft.aulast=Scotcher&rft.aufirst=Jenna&rft.date=2013-10-01&rft.volume=85&rft.issue=19&rft.spage=9164&rft.isbn=&rft.btitle=&rft.title=Analytical+chemistry&rft.issn=1520-6882&rft_id=info:doi/10.1021%2Fac401850p LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2014-04-16 N1 - Date created - 2013-10-01 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/ac401850p ER - TY - JOUR T1 - Pore-Scale Simulations of Gas Displacing Liquid in a Homogeneous Pore Network Using the Lattice Boltzmann Method AN - 1832595987; 681313-7 AB - A lattice Boltzmann high-density-ratio model, which uses diffuse interface theory to describe the interfacial dynamics and was proposed originally by Lee and Liu (J Comput Phys 229:8045-8063, 2010), is extended to simulate immiscible multiphase flows in porous media. A wetting boundary treatment is proposed for concave and convex corners. The capability and accuracy of this model is first validated by simulations of equilibrium contact angle, injection of a non-wetting gas into two parallel capillary tubes, and dynamic capillary intrusion. The model is then used to simulate gas displacement of liquid in a homogenous two-dimensional pore network consisting of uniformly spaced square obstructions. The influence of capillary number (Ca), viscosity ratio ( (sub InlineEquation ... (super ), surface wettability, and Bond number (Bo) is studied systematically. In the drainage displacement, we have identified three different regimes, namely stable displacement, capillary fingering, and viscous fingering, all of which are strongly dependent upon the capillary number, viscosity ratio, and Bond number. Gas saturation generally increases with an increase in capillary number at breakthrough, whereas a slight decrease occurs when Ca is increased from (sub InlineEquation ... (super to (sub InlineEquation ... (super , which is associated with the viscous instability at high Ca. Increasing the viscosity ratio can enhance stability during displacement, leading to an increase in gas saturation. In the two-dimensional phase diagram, our results show that the viscous fingering regime occupies a zone markedly different from those obtained in previous numerical and experimental studies. When the surface wettability is taken into account, the residual liquid blob decreases in size with the affinity of the displacing gas to the solid surface. Increasing Bo can increase the gas saturation, and stable displacement is observed for (sub InlineEquation ... (super because the applied gravity has a stabilizing influence on the drainage process. Copyright 2013 Springer Science+Business Media Dordrecht JF - Transport in Porous Media AU - Liu, Haihu AU - Valocchi, Albert J AU - Kang, Qinjun AU - Werth, Charles Y1 - 2013/09// PY - 2013 DA - September 2013 SP - 555 EP - 580 PB - Springer, Dordrecht VL - 99 IS - 3 SN - 0169-3913, 0169-3913 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832595987?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transport+in+Porous+Media&rft.atitle=Pore-Scale+Simulations+of+Gas+Displacing+Liquid+in+a+Homogeneous+Pore+Network+Using+the+Lattice+Boltzmann+Method&rft.au=Liu%2C+Haihu%3BValocchi%2C+Albert+J%3BKang%2C+Qinjun%3BWerth%2C+Charles&rft.aulast=Liu&rft.aufirst=Haihu&rft.date=2013-09-01&rft.volume=99&rft.issue=3&rft.spage=555&rft.isbn=&rft.btitle=&rft.title=Transport+in+Porous+Media&rft.issn=01693913&rft_id=info:doi/10.1007%2Fs11242-013-0200-8 L2 - http://springerlink.metapress.com/(l4tqdq55jga2hgb0achos1qm)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:100342,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 DO - http://dx.doi.org/10.1007/s11242-013-0200-8 ER - TY - JOUR T1 - Neutron Interactions with (3)He Revisited - II: Nonelastic Cross Sections in the Mega-Electron-Volt Range AN - 1671486699; 18638176 AB - Reliable nonelastic cross-section measurements of fast neutrons with (3)He are sparse. In the energy range up to 40 MeV, the data are dominated by unpublished nonelastic n-(3)He values derived from measurements made in 1982. As mentioned elsewhere, n-(3)He elastic cross-section data reported in the same report had not been corrected for the outgoing neutron attenuation even though the sample size was >7 mol. To check the database of existing nonelastic n-(3)He cross-section data, and in particular those from 1982, a detailed balance calculation of time-reversed charged-particle data was performed. Because there are few existing independent data, we provide an updated detailed balance analysis in the energy range up to 31 MeV for both (3)He(n,p)(3)H and (3)He(n,d)(2)H, supplying accurate absolute-angle-dependent differential cross sections. Subtracting the integrals of these and the elastic cross sections from the total provides a prediction for the sum of the (3)He(n,2n)2p and (3)He(n,n + p)(2)H cross sections. The relevant experimental data are compared with their time-reversed counterparts. JF - Nuclear Science and Engineering AU - Drosg, M AU - Lisowski, P W AD - University of Vienna, Vienna, Austria Y1 - 2013/09// PY - 2013 DA - Sep 2013 SP - 19 EP - 27 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 175 IS - 1 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Supplying KW - Databases KW - Fast neutrons KW - Energy (nuclear) KW - Integrals KW - Attenuation KW - Cross sections KW - Mathematical analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671486699?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Neutron+Interactions+with+%283%29He+Revisited+-+II%3A+Nonelastic+Cross+Sections+in+the+Mega-Electron-Volt+Range&rft.au=Drosg%2C+M%3BLisowski%2C+P+W&rft.aulast=Drosg&rft.aufirst=M&rft.date=2013-09-01&rft.volume=175&rft.issue=1&rft.spage=19&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Number of references - 27 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - Phase Space Density matching of relativistic electrons using the Van Allen Probes: REPT results AN - 1541429583; 19770625 AB - Phase Space Density (PSD) matching can be used to identify the presence of nonadiabatic processes, evaluate accuracy of magnetic field models, or to cross-calibrate instruments. Calculating PSD in adiabatic invariant coordinates requires a global specification of the magnetic field. For a well specified global magnetic field, nonadiabatic processes or inadequate cross calibration will give a poor PSD match. We have calculated PSD( mu , K) for both Van Allen Probes using a range of models and compare these PSDs at conjunctions in L* (for given mu , K). We quantitatively assess the relative goodness of each model for radiation belt applications. We also quantify the uncertainty in the model magnetic field magnitude and the related uncertainties in PSD, which has applications for modeling and particle data without concurrent magnetic field measurements. Using this technique, we show the error in PSD for an energy spectrum observed by the relativistic electron-proton telescope (REPT) is a factor of 1.2 using the TS04 model. Key Points * PSD matching shows TS04 model best represents inner magnetosphere configuration * PSD error from a model 1st adiabatic invariant is small (factor of 1.16) * The REPT instruments are confirmed to be well cross-calibrated JF - Geophysical Research Letters AU - Morley, S K AU - Henderson, M G AU - Reeves, G D AU - W Friedel, RH AU - Baker, D N AD - Space Science and Applications, Los Alamos National Laboratory, Los Alamos, New Mexico, USA. Y1 - 2013/09// PY - 2013 DA - September 2013 SP - 4798 EP - 4802 PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 40 IS - 18 SN - 0094-8276, 0094-8276 KW - Environmental Engineering Abstracts (EN); Aerospace & High Technology Database (AH) KW - radiation belts KW - Van Allen probes KW - relativistic electrons KW - phase space density KW - Uncertainty KW - Magnetic fields KW - Invariants KW - Mathematical models KW - Space probes KW - Errors KW - Adiabatic flow KW - Matching UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1541429583?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Phase+Space+Density+matching+of+relativistic+electrons+using+the+Van+Allen+Probes%3A+REPT+results&rft.au=Morley%2C+S+K%3BHenderson%2C+M+G%3BReeves%2C+G+D%3BW+Friedel%2C+RH%3BBaker%2C+D+N&rft.aulast=Morley&rft.aufirst=S&rft.date=2013-09-01&rft.volume=40&rft.issue=18&rft.spage=4798&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1002%2Fgrl.50909 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-07-01 N1 - Last updated - 2017-01-05 DO - http://dx.doi.org/10.1002/grl.50909 ER - TY - JOUR T1 - Ice dynamic response to two modes of surface lake drainage on the Greenland ice sheet AN - 1492588231; 2014-005858 AB - Supraglacial lake drainage on the Greenland ice sheet opens surface-to-bed connections, reduces basal friction, and temporarily increases ice flow velocities by up to an order of magnitude. Existing field-based observations of lake drainages and their impact on ice dynamics are limited, and focus on one specific draining mechanism. Here, we report and analyse global positioning system measurements of ice velocity and elevation made at five locations surrounding two lakes that drained by different mechanisms and produced different dynamic responses. For the lake that drained slowly (>24 h) by overtopping its basin, delivering water via a channel to a pre-existing moulin, speedup and uplift were less than half those associated with a lake that drained rapidly (>2 h) through hydrofracturing and the creation of new moulins in the lake bottom. Our results suggest that the mode and associated rate of lake drainage govern the impact on ice dynamics. Copyright 2013 IOP Publishing Ltd JF - Environmental Research Letters AU - Tedesco, Marco AU - Willis, Ian C AU - Hoffman, Matthew J AU - Banwell, Alison F AU - Alexander, Patrick AU - Arnold, Neil S Y1 - 2013/09// PY - 2013 DA - September 2013 EP - Paper No. 034007 PB - Institute of Physics and IOP Publishing, Bristol VL - 8 IS - 3 KW - Global Positioning System KW - Arctic region KW - elevation KW - drainage KW - Paakitsoq KW - lakes KW - Greenland ice sheet KW - West Greenland KW - glacial features KW - digital terrain models KW - ice movement KW - Greenland KW - Lake Ponting KW - dynamics KW - ice KW - moulins KW - Lake Half Moon KW - glacial geology KW - diurnal variations KW - ASTER instrument KW - meltwater KW - glacial lakes KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492588231?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Research+Letters&rft.atitle=Ice+dynamic+response+to+two+modes+of+surface+lake+drainage+on+the+Greenland+ice+sheet&rft.au=Tedesco%2C+Marco%3BWillis%2C+Ian+C%3BHoffman%2C+Matthew+J%3BBanwell%2C+Alison+F%3BAlexander%2C+Patrick%3BArnold%2C+Neil+S&rft.aulast=Tedesco&rft.aufirst=Marco&rft.date=2013-09-01&rft.volume=8&rft.issue=3&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Environmental+Research+Letters&rft.issn=1748-9326&rft_id=info:doi/10.1088%2F1748-9326%2F8%2F3%2F034007 L2 - http://iopscience.iop.org/1748-9326 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 31 N1 - Document feature - illus. N1 - Last updated - 2014-01-30 N1 - SubjectsTermNotLitGenreText - Arctic region; ASTER instrument; digital terrain models; diurnal variations; drainage; dynamics; elevation; glacial features; glacial geology; glacial lakes; Global Positioning System; Greenland; Greenland ice sheet; ice; ice movement; Lake Half Moon; Lake Ponting; lakes; meltwater; moulins; Paakitsoq; West Greenland DO - http://dx.doi.org/10.1088/1748-9326/8/3/034007 ER - TY - JOUR T1 - Early-stage hypogene karstification in a mountain hydrologic system; a coupled thermohydrochemical model incorporating buoyant convection AN - 1464884820; 2013-095647 AB - The early stage of hypogene karstification is investigated using a coupled thermohydrochemical model of a mountain hydrologic system, in which water enters along a water table and descends to significant depth ( approximately 1 km) before ascending through a central high-permeability fracture. The model incorporates reactive alteration driven by dissolution/precipitation of limestone in a carbonic acid system, due to both temperature- and pressure-dependent solubility, and kinetics. Simulations were carried out for homogeneous and heterogeneous initial fracture aperture fields, using the FEHM (Finite Element Heat and Mass Transfer) code. Initially, retrograde solubility is the dominant mechanism of fracture aperture growth. As the fracture transmissivity increases, a critical Rayleigh number value is exceeded at some stage. Buoyant convection is then initiated and controls the evolution of the system thereafter. For an initially homogeneous fracture aperture field, deep well-organized buoyant convection rolls form. For initially heterogeneous aperture fields, preferential flow suppresses large buoyant convection rolls, although a large number of smaller rolls form. Even after the onset of buoyant convection, dissolution in the fracture is sustained along upward flow paths by retrograde solubility and by additional "mixing corrosion" effects closer to the surface. Aperture growth patterns in the fracture are very different from those observed in simulations of epigenic karst systems, and retain imprints of both buoyant convection and preferential flow. Both retrograde solubility and buoyant convection contribute to these differences. The paper demonstrates the potential value of coupled models as tools for understanding the evolution and behavior of hypogene karst systems. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Water Resources Research AU - Chaudhuri, A AU - Rajaram, H AU - Viswanathan, H Y1 - 2013/09// PY - 2013 DA - September 2013 SP - 5880 EP - 5899 PB - American Geophysical Union, Washington, DC VL - 49 IS - 9 SN - 0043-1397, 0043-1397 KW - hydrology KW - carbonic acid KW - karst hydrology KW - equations KW - solubility KW - convection KW - solution KW - porosity KW - calcite KW - buoyancy KW - karstification KW - finite element analysis KW - heat transfer KW - mass transfer KW - kinetics KW - inorganic acids KW - carbonates KW - permeability KW - 23:Geomorphology KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464884820?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Early-stage+hypogene+karstification+in+a+mountain+hydrologic+system%3B+a+coupled+thermohydrochemical+model+incorporating+buoyant+convection&rft.au=Chaudhuri%2C+A%3BRajaram%2C+H%3BViswanathan%2C+H&rft.aulast=Chaudhuri&rft.aufirst=A&rft.date=2013-09-01&rft.volume=49&rft.issue=9&rft.spage=5880&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1002%2Fwrcr.20427 L2 - http://www.agu.org/journals/wr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 66 N1 - PubXState - DC N1 - Document feature - illus. N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-12-05 N1 - CODEN - WRERAQ N1 - SubjectsTermNotLitGenreText - buoyancy; calcite; carbonates; carbonic acid; convection; equations; finite element analysis; heat transfer; hydrology; inorganic acids; karst hydrology; karstification; kinetics; mass transfer; permeability; porosity; solubility; solution DO - http://dx.doi.org/10.1002/wrcr.20427 ER - TY - JOUR T1 - Large-eddy simulations of turbulent flow for grid-to-rod fretting in nuclear reactors AN - 1464603214; 18783601 AB - The grid-to-rod fretting (GTRF) problem in pressurized water reactors is a flow-induced vibration problem that results in wear and failure of the fuel rods in nuclear assemblies. In order to understand the fluid dynamics of GTRF and to build an archival database of turbulence statistics for various configurations, implicit large-eddy simulations of time-dependent single-phase turbulent flow have been performed in 3 x 3 and 5x5 rod bundles with a single grid spacer. To assess the computational mesh and resolution requirements, a method for quantitative assessment of unstructured meshes with no-slip walls is described. The calculations have been carried out using Hydra-TH, a thermal-hydraulics code developed at Los Alamos for the Consortium for Advanced Simulation of Light water reactors, a United States Department of Energy Innovation Hub. Hydra-TH uses a second-order implicit incremental projection method to solve the single-phase incompressible Navier-Stokes equations. The simulations explicitly resolve the large scale motions of the turbulent flow field using first principles and rely on a monotonicity-preserving numerical technique to represent the unresolved scales. Each series of simulations for the 3 x 3 and 5x5 rod-bundle geometries is an analysis of the flow field statistics combined with a mesh-refinement study and validation with available experimental data. Our primary focus is the time history and statistics of the forces loading the fuel rods. These hydrodynamic forces are believed to be the key player resulting in rod vibration and GTRF wear, one of the leading causes for leaking nuclear fuel which costs power utilities millions of dollars in preventive measures. We demonstrate that implicit large-eddy simulation of rod-bundle flows is a viable way to calculate the excitation forces for the GTRF problem. JF - Nuclear Engineering and Design AU - Bakosi, J AU - Christon, M A AU - Lowrie, R B AU - Pritchett-Sheats, L A AU - Nourgaliev, R R AD - Computational Physics Croup (CCS-2), Computer, Computational and Statistical Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States jbakosi@lanl.gov Y1 - 2013/09// PY - 2013 DA - Sep 2013 SP - 544 EP - 561 PB - Elsevier B.V., The Boulevard Kidlington Oxford OX5 1GB United Kingdom VL - 262 SN - 0029-5493, 0029-5493 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Turbulent flow KW - Computational fluid dynamics KW - Statistics KW - Computer simulation KW - Navier-Stokes equations KW - Turbulence KW - Fluid flow KW - Mathematical analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464603214?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Engineering+and+Design&rft.atitle=Large-eddy+simulations+of+turbulent+flow+for+grid-to-rod+fretting+in+nuclear+reactors&rft.au=Bakosi%2C+J%3BChriston%2C+M+A%3BLowrie%2C+R+B%3BPritchett-Sheats%2C+L+A%3BNourgaliev%2C+R+R&rft.aulast=Bakosi&rft.aufirst=J&rft.date=2013-09-01&rft.volume=262&rft.issue=&rft.spage=544&rft.isbn=&rft.btitle=&rft.title=Nuclear+Engineering+and+Design&rft.issn=00295493&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-01 N1 - Number of references - 25 N1 - Last updated - 2014-04-08 ER - TY - JOUR T1 - Evaluation and Uncertainty Quantification of Prompt Fission Neutron Spectra of Uranium and Plutonium Isotopes AN - 1448750596; 18638180 AB - The prompt fission neutron spectra (PFNS) of the low-incident-energy neutron-induced fission reactions n + (229-238)U and n + (235-242)Pu have been systematically evaluated using differential experimental data and the Los Alamos model (LA model). Using the first-order, linear Kalman filter, the LA model parameters are constrained using the experimental data and an evaluation of the PFNS and its uncertainties across a suite of isotopes results. Correlations between isotopes of each actinide are presented through the model parameter correlations, and the resulting evaluations can be used to fill in inconsistencies within the ENDF/B-VII.1 library where PFNS data are scarce or in need of an update. JF - Nuclear Science and Engineering AU - Rising, M E AU - Talou, P AU - Kawano, T AU - Prinja, A K AD - Los Alamos National Laboratory, T-2, Nuclear and Particle Physics, Astrophysics and Cosmology Theoretical Division, Los Alamos, New Mexico 87545 mrising@lanl.gov Y1 - 2013/09// PY - 2013 DA - Sep 2013 SP - 81 EP - 93 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 175 IS - 1 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear fission KW - Neutron spectra KW - Uncertainty KW - Isotopes KW - Mathematical models KW - Uranium KW - Correlation KW - Actinides UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448750596?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Evaluation+and+Uncertainty+Quantification+of+Prompt+Fission+Neutron+Spectra+of+Uranium+and+Plutonium+Isotopes&rft.au=Rising%2C+M+E%3BTalou%2C+P%3BKawano%2C+T%3BPrinja%2C+A+K&rft.aulast=Rising&rft.aufirst=M&rft.date=2013-09-01&rft.volume=175&rft.issue=1&rft.spage=81&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Number of references - 39 N1 - Last updated - 2013-11-06 ER - TY - JOUR T1 - Nonspherical Perturbations of Spherical Geometries in Transport Theory AN - 1448740247; 18638178 AB - It is often desirable to solve radiation transport problems in one-dimensional spherical geometries even if the actual object being modeled is not spherical. It may be possible to use perturbation theory to account for the difference between the real multidimensional system and the spherical approximation. This idea is tested using uncollided as well as multigroup inhomogeneous transport problems with upscattering. Asymmetric and nonuniform perturbations are made to the shielding (not the source) of spherical geometries, including transformations from a sphere to a cube (the surface transformation function is derived), and Schwinger, Roussopolos, and combined perturbation estimates are applied. For uncollided fluxes, perturbation theory, particularly the Schwinger estimate, worked very well when the response of interest was the flux measured at a symmetric spherical 4p detector external to the geometry, but perturbation theory did not work well when the response of interest was the flux measured at a single external point (unless extra care was taken to account for geometric effects). For neutron-induced gamma-ray line fluxes, the Roussopolos estimate worked well when the response of interest was the flux measured at an external 4p detector or an external point detector. JF - Nuclear Science and Engineering AU - Favorite, Jeffrey A AD - Los Alamos National Laboratory, Computational Physics (X-CP) Division, MS F663, Los Alamos, New Mexico 87545 fave@lanl.gov Y1 - 2013/09// PY - 2013 DA - Sep 2013 SP - 44 EP - 69 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 175 IS - 1 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Estimates KW - Radiation transport KW - Transformations KW - Detectors KW - Perturbation methods KW - Approximation KW - Perturbation theory KW - Fluxes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448740247?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Nonspherical+Perturbations+of+Spherical+Geometries+in+Transport+Theory&rft.au=Favorite%2C+Jeffrey+A&rft.aulast=Favorite&rft.aufirst=Jeffrey&rft.date=2013-09-01&rft.volume=175&rft.issue=1&rft.spage=44&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Number of references - 30 N1 - Last updated - 2013-11-06 ER - TY - JOUR T1 - Interaction of Sonic Booms with Isolated and Multiple Buildings AN - 1448731560; 18656852 AB - The sonic boom an aircraft generates when it travels faster than the speed of sound is the last environmental obstacle to the economic viability and widespread development of a commercial supersonic transport. One important aspect to consider in this problem is the impact of sonic booms at the ground level, and in particular their interactions with buildings. With this objective in mind, acoustic data was collected at Virginia Tech around and on the exterior surfaces of a simplified building structure exposed to simulated sonic booms, where an explosive technique was used to generate the desired pressure waveforms. These experiments were simulated with a three-dimensional numerical model by combining the image-source method for the reflected field with an extension of the Biot-Tolstoy-Medwin method for the diffracted field. This numerical model is verified against a boundary element solution and validated against experimental data. The key advantages of this modeling approach are pointed out such as the ability to model large three-dimensional domains over a wide frequency range and also to decompose the sound field into direct, reflected, and diffracted components, thus allowing a better understanding of the physical mechanisms involved in the sound propagation. This validated numerical model is also used to study the sound propagation around a cluster of six rectangular buildings, for a range of elevated source positions. JF - Noise & Vibration Worldwide AU - Remillieux, Marcel C AU - Pasareanu, Stephanie M AD - Geophysics Group, Los Alamos National Laboratory, EES-17, MS D446, Los Alamos, NM 87545, United States Y1 - 2013/09// PY - 2013 DA - Sep 2013 SP - 9 EP - 17 PB - Multi-Science Publishing Co. Ltd., 107 High St. Brentwood, Essex CM14 4RX United Kingdom VL - 44 IS - 8 SN - 0957-4565, 0957-4565 KW - Environment Abstracts KW - outdoor sound propagation KW - impulsive sound KW - sonic boom KW - geometrical acoustics KW - Biot-Tolstoy-Medwin method KW - boundary element method KW - isolated buildings KW - multiple buildings KW - Travel KW - Mathematical models KW - Aircraft KW - Acoustics KW - Vibration KW - Economics KW - Noise levels KW - USA, Virginia KW - Explosives KW - Buildings KW - ENA 10:Noise Pollution UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448731560?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Noise+%26+Vibration+Worldwide&rft.atitle=Interaction+of+Sonic+Booms+with+Isolated+and+Multiple+Buildings&rft.au=Remillieux%2C+Marcel+C%3BPasareanu%2C+Stephanie+M&rft.aulast=Remillieux&rft.aufirst=Marcel&rft.date=2013-09-01&rft.volume=44&rft.issue=8&rft.spage=9&rft.isbn=&rft.btitle=&rft.title=Noise+%26+Vibration+Worldwide&rft.issn=09574565&rft_id=info:doi/10.1260%2F0957-4565.44.8.9 L2 - http://multi-science.metapress.com/link.asp?target=contribution&;id=V1110531774362L7 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Travel; Mathematical models; Aircraft; Acoustics; Vibration; Economics; Noise levels; Explosives; Buildings; USA, Virginia DO - http://dx.doi.org/10.1260/0957-4565.44.8.9 ER - TY - JOUR T1 - Finding non-crystallographic symmetry in density maps of macromolecular structures AN - 1439229020; 18603914 AB - The internal symmetry of a macromolecule is both an important aspect of its function and a useful feature in obtaining a structure by X-ray crystallography and other techniques. A method is presented for finding internal symmetry and other non-crystallographic symmetry in a structure based on patterns of density in a density map for that structure. Regions in map that are similar are identified by cutting out a sphere of density from a region that has high local variation and using an FFT-based correlation search to find other regions that match. The relationships among correlated regions are then refined to maximize their correlations and are found to accurately represent non-crystallographic symmetry in the map. JF - Journal of Structural and Functional Genomics AU - Terwilliger, Thomas C AD - Los Alamos National Laboratory, Bioscience Division, Los Alamos, NM, 87545, USA, terwilliger@lanl.gov Y1 - 2013/09// PY - 2013 DA - Sep 2013 SP - 91 EP - 95 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 14 IS - 3 SN - 1345-711X, 1345-711X KW - Biotechnology and Bioengineering Abstracts; Genetics Abstracts KW - X-ray crystallography KW - Macromolecules KW - Structure-function relationships KW - Gene mapping KW - G 07710:Chemical Mutagenesis & Radiation KW - W 30900:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1439229020?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Structural+and+Functional+Genomics&rft.atitle=Finding+non-crystallographic+symmetry+in+density+maps+of+macromolecular+structures&rft.au=Terwilliger%2C+Thomas+C&rft.aulast=Terwilliger&rft.aufirst=Thomas&rft.date=2013-09-01&rft.volume=14&rft.issue=3&rft.spage=91&rft.isbn=&rft.btitle=&rft.title=Journal+of+Structural+and+Functional+Genomics&rft.issn=1345711X&rft_id=info:doi/10.1007%2Fs10969-013-9157-7 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-10-01 N1 - Number of references - 24 N1 - Last updated - 2013-10-21 N1 - SubjectsTermNotLitGenreText - X-ray crystallography; Macromolecules; Structure-function relationships; Gene mapping DO - http://dx.doi.org/10.1007/s10969-013-9157-7 ER - TY - JOUR T1 - Electron Acceleration in the Heart of the Van Allen Radiation Belts AN - 1808050942; 20374454 AB - Local AccelerationHow the electrons trapped in Earth-encircling Van Allen radiation belts get accelerated has been debated since their discovery in 1958. Reeves et al. (p. 991, published online 25 July) used data from the Van Allen Radiation Belt Storm Probes, launched by NASA on 30 August 2012, to discover that radiation belt electrons are accelerated locally by wave-particle interactions, rather than by radial transport from regions of weaker to stronger magnetic fields. JF - Science AU - Reeves, G D AU - Spence, HE AU - Henderson, M G AU - Morley, S K AU - Friedel, RHW AU - Funsten, HO AU - Baker, D N AU - Kanekal, S G AU - Blake, J B AU - Fennell, J F AU - Claudepierre, S G AU - Thorne, R M AU - Turner, D L AU - Kletzing, CA AU - Kurth, W S AU - Larsen, BA AU - Niehof, J T AD - Space Science and Applications Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA reeves@lanl.gov Y1 - 2013/08/30/ PY - 2013 DA - 2013 Aug 30 SP - 991 EP - 994 PB - American Association for the Advancement of Science, 1200 New York Avenue, NW Washington DC 20005 United States VL - 341 IS - 6149 SN - 0036-8075, 0036-8075 KW - Solid State and Superconductivity Abstracts (SO); Environmental Engineering Abstracts (EN) KW - Magnetic fields KW - Transport KW - NASA KW - Wave-particle interactions KW - Online KW - Radiation belts KW - Storms KW - Electron acceleration UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1808050942?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Electron+Acceleration+in+the+Heart+of+the+Van+Allen+Radiation+Belts&rft.au=Reeves%2C+G+D%3BSpence%2C+HE%3BHenderson%2C+M+G%3BMorley%2C+S+K%3BFriedel%2C+RHW%3BFunsten%2C+HO%3BBaker%2C+D+N%3BKanekal%2C+S+G%3BBlake%2C+J+B%3BFennell%2C+J+F%3BClaudepierre%2C+S+G%3BThorne%2C+R+M%3BTurner%2C+D+L%3BKletzing%2C+CA%3BKurth%2C+W+S%3BLarsen%2C+BA%3BNiehof%2C+J+T&rft.aulast=Reeves&rft.aufirst=G&rft.date=2013-08-30&rft.volume=341&rft.issue=6149&rft.spage=991&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1237743 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-08-01 N1 - Last updated - 2016-08-03 DO - http://dx.doi.org/10.1126/science.1237743 ER - TY - JOUR T1 - Microslips as precursors of large slip events in the stick-slip dynamics of sheared granular layers; a discrete element model analysis AN - 1542644508; 2014-048237 AB - We investigate the stick-slip behavior of a granular system confined and sheared by deformable solid blocks using three-dimensional discrete element method simulations. Our modeling results show that large slip events are preceded by a sequence of small slip events-microslips-whose occurrence accelerates exponentially before the large slip event onset. Microslips exhibit energy release several orders of magnitude smaller than the large slip events. The microslip event rate is proposed as a measure of slip activity in the granular gouge layer. A statistical analysis shows that microslip event rate correlates well with large slip event onset and that variations in it can be used to predict large slip events. The emergence of microslips and their duration are found to be controlled by the value of the slipping contact ratio and are therefore related to the jamming/unjamming transition of frictional granular packings. Abstract Copyright (2013), American Geophysical Union. All Rights Reserved. JF - Geophysical Research Letters AU - Ferdowsi, B AU - Griffa, M AU - Guyer, R A AU - Johnson, P A AU - Marone, C AU - Carmeliet, J Y1 - 2013/08/28/ PY - 2013 DA - 2013 Aug 28 SP - 4194 EP - 4198 PB - American Geophysical Union, Washington, DC VL - 40 IS - 16 SN - 0094-8276, 0094-8276 KW - discrete element analysis KW - stick-slip KW - slip rates KW - displacements KW - layered materials KW - models KW - granular materials KW - seismicity KW - shear KW - tectonics KW - seismotectonics KW - faults KW - 19:Seismology KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542644508?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Microslips+as+precursors+of+large+slip+events+in+the+stick-slip+dynamics+of+sheared+granular+layers%3B+a+discrete+element+model+analysis&rft.au=Ferdowsi%2C+B%3BGriffa%2C+M%3BGuyer%2C+R+A%3BJohnson%2C+P+A%3BMarone%2C+C%3BCarmeliet%2C+J&rft.aulast=Ferdowsi&rft.aufirst=B&rft.date=2013-08-28&rft.volume=40&rft.issue=16&rft.spage=4194&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1002%2Fgrl.50813 L2 - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291944-8007/issues LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 30 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2014-07-04 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - discrete element analysis; displacements; faults; granular materials; layered materials; models; seismicity; seismotectonics; shear; slip rates; stick-slip; tectonics DO - http://dx.doi.org/10.1002/grl.50813 ER - TY - JOUR T1 - Nanostructured nonprecious metal catalysts for oxygen reduction reaction. AN - 1426749594; 23815084 AB - Platinum-based catalysts represent a state of the art in the electrocatalysis of oxygen reduction reaction (ORR) from the point of view of their activity and durability in harnessing the chemical energy via direct electrochemical conversion. However, because platinum is both expensive and scarce, its widespread implementation in such clean energy applications is limited. Recent breakthroughs in the synthesis of high-performance nonprecious metal catalysts (NPMCs) make replacement of Pt in ORR electrocatalysts with earth-abundant elements, such as Fe, Co, N, and C, a realistic possibility. In this Account, we discuss how we can obtain highly promising M-N-C (M: Fe and/or Co) catalysts by simultaneously heat-treating precursors of nitrogen, carbon, and transition metals at 800-1000 °C. The activity and durability of resulting catalysts depend greatly on the selection of precursors and synthesis chemistry. In addition, they correlate quite well with the catalyst nanostructure. While chemists have presented no conclusive description of the active catalytic site for this class of NPMCs, they have developed a designed approach to making active and durable materials, focusing on the catalyst nanostructure. The approach consists of nitrogen doping, in situ carbon graphitization, and the usage of graphitic structures (possibly graphene and graphene oxides) as carbon precursors. Various forms of nitrogen, particularly pyridinic and quaternary, can act as n-type carbon dopants in the M-N-C catalysts, assisting in the formation of disordered carbon nanostructures and donating electrons to the carbon. The CNx structures are likely a crucial part of the ORR active site(s). Noteworthy, the ORR activity is not necessarily governed by the amount of nitrogen, but by how the nitrogen is incorporated into the nanostructures. Apart from the possibility of a direct participation in the active site, the transition metal often plays an important role in the in situ formation of various carbon nanostructures by catalyzing the decomposition of the nitrogen/carbon precursor. We can control the formation of different nanostructures during the synthesis of M-N-C catalysts. For example, in situ formed nitrogen-doped graphene-sheets can only be derived from polyaniline (PANI), probably due to structural similarities between the aromatic structures of PANI and graphene. Highly-graphitized carbon nanostructures may serve as a matrix for the formation of ORR-active groups with improved catalytic activity and durability, containing nitrogen and most probably also metal atoms. In the future, we will likely focus NPMC synthesis approaches on precise control of interactions between precursors of the metal and carbon/nitrogen during the heat treatment. The main purposes will be to maximize the number of active sites, optimize nitrogen doping levels, and generate morphologies capable of hosting active and stable ORR sites. JF - Accounts of chemical research AU - Wu, Gang AU - Zelenay, Piotr AD - Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. Y1 - 2013/08/20/ PY - 2013 DA - 2013 Aug 20 SP - 1878 EP - 1889 VL - 46 IS - 8 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1426749594?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Accounts+of+chemical+research&rft.atitle=Nanostructured+nonprecious+metal+catalysts+for+oxygen+reduction+reaction.&rft.au=Wu%2C+Gang%3BZelenay%2C+Piotr&rft.aulast=Wu&rft.aufirst=Gang&rft.date=2013-08-20&rft.volume=46&rft.issue=8&rft.spage=1878&rft.isbn=&rft.btitle=&rft.title=Accounts+of+chemical+research&rft.issn=1520-4898&rft_id=info:doi/10.1021%2Far400011z LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2014-04-08 N1 - Date created - 2013-08-20 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/ar400011z ER - TY - JOUR T1 - Ejecta source and transport modeling in the FLAG hydrocode AN - 1448716631; 18610552 AB - We present the ongoing development and implementation of an ejecta model in the FLAG hydrocode. Ejecta is the term given to paniculate matter that is produced at the free surface of a material subject to extreme shock loading. Following shock propagation into a material and reflection at its free surface, conditions may be sufficient to induce phase changes, damage, or fragmentation at the surface. The dynamics of the fragmentation may be such that a "cloud" of paniculate matter forms and propagates away from the material. Modeling such phenomena in a continuum hydrodynamics code challenges the assumptions underlying the numerical approximations made in the hydrodynamics. The representative scales for the paniculate matter are often much smaller than the representative scales for the bulk material producing the ejecta. However, this scale separation allows for statistical descriptions of ejecta that are compatible with continuum mechanics. Earlier work documents an initial effort in modeling ejecta in the FLAG hydrocode. The FLAG hydrocode computes continuum mechanics solutions for fluid and solid materials in an Arbitrary-Eulerian-Lagrang-ian (ALE) framework. To model ejecta in FLAG, a hybrid particle-continuum representation was defined that allows for coupling with continuum materials on large (bulk) scales. Numerical models were developed and implemented for panicle production (sourcing) as well as for solving the particle equations of motion. The numerics were shown to conserve mass, momentum and energy, and preliminary results were given for modeling drag and volume effects. This work documents recent advances in source and transport models. Spatial and temporal dependencies have been added to the source models to account for geometric free-surface variations, mesh dependence, and shock loading. More physically relevant drag models have been implemented that include Reynolds number effects. These will be presented along with test results verifying the models. A FLAG model of an actual ejecta experiment will also be presented. JF - Computers & Fluids AU - Fung, J AU - Harrison, A K AU - Chitanvis, S AU - Margulies, J AD - X-Computational Physics Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM, USA, fung@lanl.gov Y1 - 2013/08/16/ PY - 2013 DA - 2013 Aug 16 SP - 177 EP - 186 PB - Elsevier B.V., P.O. Box 800 Kidlington Oxford OX5 1DX United Kingdom VL - 83 SN - 0045-7930, 0045-7930 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Damage KW - Mathematical models KW - Hydrodynamics KW - Computers KW - Equations of motion KW - Model Testing KW - Model Studies KW - Drag KW - Clouds KW - Shock Loads KW - Reynolds number KW - Phase changes KW - Free Surfaces KW - Modelling KW - Q2 09422:Storage and transport KW - SW 0810:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448716631?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Fluids&rft.atitle=Ejecta+source+and+transport+modeling+in+the+FLAG+hydrocode&rft.au=Fung%2C+J%3BHarrison%2C+A+K%3BChitanvis%2C+S%3BMargulies%2C+J&rft.aulast=Fung&rft.aufirst=J&rft.date=2013-08-16&rft.volume=83&rft.issue=&rft.spage=177&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Fluids&rft.issn=00457930&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-09-01 N1 - Last updated - 2016-02-04 N1 - SubjectsTermNotLitGenreText - Mathematical models; Equations of motion; Reynolds number; Phase changes; Modelling; Drag; Clouds; Damage; Hydrodynamics; Computers; Shock Loads; Model Testing; Free Surfaces; Model Studies ER - TY - JOUR T1 - A dissipation model for staggered grid Lagrangian hydrodynamics AN - 1448708931; 18610539 AB - Viscosity terms are explicitly added to the Lagrangian staggered grid hydrodynamic equations for calculating shock wave problems. The explicit viscosity terms are commonly termed artificial viscosity. All shocks are irreversible so a dissipation model is necessary to capture the entropy created by a shock. In this work, viscosity models are derived via analytic solutions to one-dimensional shock problems for materials having linear and non-linear relationships between particle velocity and shock velocity. The dissipation model includes linear, quadratic, and cubic viscosity terms. The linear viscosity term is used to damp spurious oscillations, whereas, the quadratic and cubic viscosities are used to capture the pressure difference between a shock wave and an acoustic wave. The quadratic and cubic viscosity coefficients are material dependent and are calculated using fits to experimental data. The details of the viscosity model are discussed and numerical tests are presented. JF - Computers & Fluids AU - Morgan, N R AD - X-Computational Physics Division, Los Alamos National Laboratory. P.O. Box 1663, Los Alamos, NM, USA, nmorgan@lanl.gov Y1 - 2013/08/16/ PY - 2013 DA - 2013 Aug 16 SP - 48 EP - 57 PB - Elsevier B.V., P.O. Box 800 Kidlington Oxford OX5 1DX United Kingdom VL - 83 SN - 0045-7930, 0045-7930 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Experimental Data KW - Mathematical models KW - Hydrodynamics KW - Computers KW - Velocity KW - Sound waves KW - Model Testing KW - Hydrodynamic equations KW - Model Studies KW - Viscosity KW - Waves KW - Viscosity coefficients KW - Entropy KW - Modelling KW - SW 5010:Network design KW - Q2 09182:Methods and instruments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448708931?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Fluids&rft.atitle=A+dissipation+model+for+staggered+grid+Lagrangian+hydrodynamics&rft.au=Morgan%2C+N+R&rft.aulast=Morgan&rft.aufirst=N&rft.date=2013-08-16&rft.volume=83&rft.issue=&rft.spage=48&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Fluids&rft.issn=00457930&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-09-01 N1 - Last updated - 2016-02-04 N1 - SubjectsTermNotLitGenreText - Mathematical models; Hydrodynamics; Sound waves; Viscosity coefficients; Hydrodynamic equations; Entropy; Modelling; Experimental Data; Viscosity; Computers; Velocity; Waves; Model Testing; Model Studies ER - TY - JOUR T1 - Exploration of new limiter schemes for stress tensors in Lagrangian and ALE hydrocodes AN - 1448708795; 18610544 AB - Limiter schemes are chiefly responsible for making high-resolution computations realizable in Lagrangian, Eulerian and ALE hydrocodes. Robust limiter schemes that are frame invariant and preserve symmetry have been established for scalars and to an extent, for vectors. However such limiter schemes have not been formulated and reported in the literature for tensor variables. In this work, new designs for limiter schemes for stress tensors are explored. Novel design principles are introduced and several limiter schemes are constructed based on these guiding principles. A scaling technique based on invariants and two new designs for slope limiter are proposed. In contrast to conventional slope limiters, the scaling technique designed by constraining the second invariant of stress tensor ensures monotonicity compliance by scaling the eigenvalues of the reconstructed stress tensors. Scalar slope limiter constructed based on constraining the second invariant is a formulation to extract a slope limiter from the scaling procedure. The tensor slope limiter scheme proposed for limiting velocity gradients is also extended for constraining stress tensor and the results from the same are considered as the basis for comparing and establishing the various limiter schemes formulated in this work. These limiter formulations are compared and contrasted in a cell-centered Lagrangian framework augmented with hypo-elastic model, by virtue of several one- and two-dimensional example problems. JF - Computers & Fluids AU - Sambasivan, S K AU - Shashkov, MJ AU - Burton, DE AD - Theoretical Division (T5), Los Alamos National Laboratory, Los Alamos, NM 87545, United States, shiv@lanl.gov Y1 - 2013/08/16/ PY - 2013 DA - 2013 Aug 16 SP - 98 EP - 114 PB - Elsevier B.V., P.O. Box 800 Kidlington Oxford OX5 1DX United Kingdom VL - 83 SN - 0045-7930, 0045-7930 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Velocity gradients KW - Computers KW - Compliance KW - Stress KW - Velocity KW - Exploration KW - Slopes KW - Scaling KW - Model Studies KW - Q2 09123:Conservation KW - SW 0810:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448708795?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Fluids&rft.atitle=Exploration+of+new+limiter+schemes+for+stress+tensors+in+Lagrangian+and+ALE+hydrocodes&rft.au=Sambasivan%2C+S+K%3BShashkov%2C+MJ%3BBurton%2C+DE&rft.aulast=Sambasivan&rft.aufirst=S&rft.date=2013-08-16&rft.volume=83&rft.issue=&rft.spage=98&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Fluids&rft.issn=00457930&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-09-01 N1 - Last updated - 2016-02-04 N1 - SubjectsTermNotLitGenreText - Velocity gradients; Computers; Compliance; Velocity; Stress; Exploration; Slopes; Scaling; Model Studies ER - TY - CPAPER T1 - Uncertainty and sensitivity analysis of process-based tree mortality models T2 - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AN - 1493791036; 6257099 JF - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AU - Xu, Chonggang AU - Adams, Henry AU - Fisher, Rosie AU - McDowell, Nate Y1 - 2013/08/04/ PY - 2013 DA - 2013 Aug 04 KW - Sensitivity analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1493791036?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.atitle=Uncertainty+and+sensitivity+analysis+of+process-based+tree+mortality+models&rft.au=Xu%2C+Chonggang%3BAdams%2C+Henry%3BFisher%2C+Rosie%3BMcDowell%2C+Nate&rft.aulast=Xu&rft.aufirst=Chonggang&rft.date=2013-08-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://eco.confex.com/eco/2013/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-31 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Sensitivity of PFT definitions to carbon cycle simulations in DGVMs T2 - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AN - 1493790912; 6256851 JF - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AU - Xu, Chonggang AU - Wullschleger, Stan AU - Fisher, Rosie AU - McDowell, Nate Y1 - 2013/08/04/ PY - 2013 DA - 2013 Aug 04 KW - Sensitivity UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1493790912?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.atitle=Sensitivity+of+PFT+definitions+to+carbon+cycle+simulations+in+DGVMs&rft.au=Xu%2C+Chonggang%3BWullschleger%2C+Stan%3BFisher%2C+Rosie%3BMcDowell%2C+Nate&rft.aulast=Xu&rft.aufirst=Chonggang&rft.date=2013-08-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://eco.confex.com/eco/2013/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-31 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - A forest is not a pan of water: Temperature and vapor-pressure deficit as potent drivers of regional forest drought stress and tree mortality T2 - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AN - 1493787198; 6257097 JF - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AU - Williams, A Y1 - 2013/08/04/ PY - 2013 DA - 2013 Aug 04 KW - Forests UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1493787198?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.atitle=A+forest+is+not+a+pan+of+water%3A+Temperature+and+vapor-pressure+deficit+as+potent+drivers+of+regional+forest+drought+stress+and+tree+mortality&rft.au=Williams%2C+A&rft.aulast=Williams&rft.aufirst=A&rft.date=2013-08-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://eco.confex.com/eco/2013/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-31 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Response of pinion and juniper respiration to drought and warming T2 - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AN - 1493786102; 6257705 JF - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AU - Collins, Adam AU - McDowell, Nate AU - Ryan, Michael Y1 - 2013/08/04/ PY - 2013 DA - 2013 Aug 04 KW - Respiration UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1493786102?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.atitle=Response+of+pinion+and+juniper+respiration+to+drought+and+warming&rft.au=Collins%2C+Adam%3BMcDowell%2C+Nate%3BRyan%2C+Michael&rft.aulast=Collins&rft.aufirst=Adam&rft.date=2013-08-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://eco.confex.com/eco/2013/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-31 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - Elevated carbon dioxide: favors coexistence for competing species in a trait-based model T2 - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AN - 1493785943; 6257900 JF - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AU - Ali, Ashehad AU - Medlyn, Belinda AU - Smith, Paul AU - Crous, Kristine AU - Reich, Peter Y1 - 2013/08/04/ PY - 2013 DA - 2013 Aug 04 KW - Coexistence UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1493785943?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.atitle=Elevated+carbon+dioxide%3A+favors+coexistence+for+competing+species+in+a+trait-based+model&rft.au=Ali%2C+Ashehad%3BMedlyn%2C+Belinda%3BSmith%2C+Paul%3BCrous%2C+Kristine%3BReich%2C+Peter&rft.aulast=Ali&rft.aufirst=Ashehad&rft.date=2013-08-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://eco.confex.com/eco/2013/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-31 N1 - Last updated - 2014-02-10 ER - TY - CPAPER T1 - The role of phloem failure in tree mortality during drought T2 - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AN - 1493783876; 6257094 JF - 98th Annual Meeting of the Ecological Society of America (ESA 2013) AU - Sevanto, Sanna AU - McDowell, Nate AU - Dickman, L AU - Holtta, Teemu AU - Pangle, Robert AU - Pockman, William Y1 - 2013/08/04/ PY - 2013 DA - 2013 Aug 04 KW - Droughts UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1493783876?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.atitle=The+role+of+phloem+failure+in+tree+mortality+during+drought&rft.au=Sevanto%2C+Sanna%3BMcDowell%2C+Nate%3BDickman%2C+L%3BHoltta%2C+Teemu%3BPangle%2C+Robert%3BPockman%2C+William&rft.aulast=Sevanto&rft.aufirst=Sanna&rft.date=2013-08-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=98th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://eco.confex.com/eco/2013/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-31 N1 - Last updated - 2014-02-10 ER - TY - JOUR T1 - A Model for Tracking Fronts of Stress-Induced Permeability Enhancement AN - 1832597402; 678863-2 AB - Using an analogy to the classical Stefan problem, we construct evolution equations for the fluid pore pressure on both sides of a propagating stress-induced damage front. Closed form expressions are derived for the position of the damage front as a function of time for the cases of thermally-induced damage as well as damage induced by over-pressure. We derive expressions for the flow rate during constant pressure fluid injection from the surface corresponding to a spherically shaped subsurface damage front. Finally, our model results suggest an interpretation of field data obtained during constant pressure fluid injection over the course of 16 days at an injection site near Desert Peak, NV. Copyright 2013 Springer Science+Business Media Dordrecht and Springer Science+Business Media Dordrecht (outside the USA) JF - Transport in Porous Media AU - Lewis, K C AU - Karra, Satish AU - Kelkar, Sharad Y1 - 2013/08// PY - 2013 DA - August 2013 SP - 17 EP - 35 PB - Springer, Dordrecht VL - 99 IS - 1 SN - 0169-3913, 0169-3913 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832597402?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transport+in+Porous+Media&rft.atitle=A+Model+for+Tracking+Fronts+of+Stress-Induced+Permeability+Enhancement&rft.au=Lewis%2C+K+C%3BKarra%2C+Satish%3BKelkar%2C+Sharad&rft.aulast=Lewis&rft.aufirst=K&rft.date=2013-08-01&rft.volume=99&rft.issue=1&rft.spage=17&rft.isbn=&rft.btitle=&rft.title=Transport+in+Porous+Media&rft.issn=01693913&rft_id=info:doi/10.1007%2Fs11242-013-0171-9 L2 - http://springerlink.metapress.com/(l4tqdq55jga2hgb0achos1qm)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:100342,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 DO - http://dx.doi.org/10.1007/s11242-013-0171-9 ER - TY - JOUR T1 - Characteristics of CO (sub 2) -driven cold-water geyser, Crystal Geyser in Utah; experimental observation and mechanism analyses AN - 1700096127; 2015-072163 AB - Geologic carbon capture and storage (CCS) is an option for reducing CO (sub 2) emissions, but leakage to the surface is a risk factor. Natural CO (sub 2) reservoirs that erupt from abandoned oil and gas holes leak to the surface as spectacular cold geysers in the Colorado Plateau, United States. A better understanding of the mechanisms of CO (sub 2) -driven cold-water geysers will provide valuable insight about the potential modes of leakage from engineered CCS sites. A notable example of a CO (sub 2) -driven cold-water geyser is Crystal Geyser in central Utah. We investigated the fluid mechanics of this regularly erupting geyser by instrumenting its conduit with sensors and measuring pressure and temperature every 20 sec over a period of 17 days. Analyses of these measurements suggest that the timescale of a single-eruption cycle is composed of four successive eruption types with two recharge periods ranging from 30 to 40 h. Current eruption patterns exhibit a bimodal distribution, but these patterns evolved during past 80 years. The field observation suggests that the geyser's eruptions are regular and predictable and reflect pressure and temperature changes resulting from Joule-Thomson cooling and endothermic CO (sub 2) exsolution. The eruption interval between multiple small-scale eruptions is a direct indicator of the subsequent large-scale eruption. Abstract Copyright (2010), John Wiley & Sons, Ltd. JF - Geofluids (Oxford) AU - Han, W S AU - Lu, M AU - McPherson, B J AU - Keating, E H AU - Moore, J AU - Park, E AU - Watson, Z T AU - Jung, N H Y1 - 2013/08// PY - 2013 DA - August 2013 SP - 283 EP - 297 PB - Wiley-Blackwell, Oxford VL - 13 IS - 3 SN - 1468-8115, 1468-8115 KW - United States KW - central Utah KW - storage coefficient KW - eruption interval KW - preferential flow KW - fluid dynamics KW - seepage KW - reservoir rocks KW - carbon dioxide KW - substrates KW - hydrologic cycle KW - sedimentary rocks KW - Crystal Geyser KW - geysers KW - discharge KW - P-T conditions KW - hydrology KW - biodegradation KW - methane KW - carbon sequestration KW - pressure KW - Colorado Plateau KW - endothermic reactions KW - cold-water geysers KW - oxidation KW - bubbles KW - solutes KW - Navajo Sandstone KW - Grand County Utah KW - migration of elements KW - Mesozoic KW - models KW - genesis KW - organic compounds KW - saturation KW - natural analogs KW - hydrocarbons KW - travertine KW - risk assessment KW - Utah KW - greenhouse gases KW - carbonate rocks KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700096127?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geofluids+%28Oxford%29&rft.atitle=Characteristics+of+CO+%28sub+2%29+-driven+cold-water+geyser%2C+Crystal+Geyser+in+Utah%3B+experimental+observation+and+mechanism+analyses&rft.au=Han%2C+W+S%3BLu%2C+M%3BMcPherson%2C+B+J%3BKeating%2C+E+H%3BMoore%2C+J%3BPark%2C+E%3BWatson%2C+Z+T%3BJung%2C+N+H&rft.aulast=Han&rft.aufirst=W&rft.date=2013-08-01&rft.volume=13&rft.issue=3&rft.spage=283&rft.isbn=&rft.btitle=&rft.title=Geofluids+%28Oxford%29&rft.issn=14688115&rft_id=info:doi/10.1111%2Fgfl.12018 L2 - http://www.blackwellpublishing.com/journal.asp?ref=1468-8115 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2015-01-01 N1 - Number of references - 80 N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2015-11-19 N1 - SubjectsTermNotLitGenreText - biodegradation; bubbles; carbon dioxide; carbon sequestration; carbonate rocks; central Utah; cold-water geysers; Colorado Plateau; Crystal Geyser; discharge; endothermic reactions; eruption interval; fluid dynamics; geysers; Grand County Utah; greenhouse gases; hydrocarbons; hydrologic cycle; hydrology; Mesozoic; genesis; migration of elements; models; natural analogs; Navajo Sandstone; organic compounds; oxidation; P-T conditions; preferential flow; pressure; reservoir rocks; risk assessment; saturation; sedimentary rocks; seepage; solutes; storage coefficient; substrates; travertine; United States; Utah; methane DO - http://dx.doi.org/10.1111/gfl.12018 ER - TY - JOUR T1 - Surrogate-based optimization of hydraulic fracturing in pre-existing fracture networks AN - 1492586119; 2014-007281 AB - Hydraulic fracturing has been used widely to stimulate production of oil, natural gas, and geothermal energy in formations with low natural permeability. Numerical optimization of fracture stimulation often requires a large number of evaluations of objective functions and constraints from forward hydraulic fracturing models, which are computationally expensive and even prohibitive in some situations. Moreover, there are a variety of uncertainties associated with the pre-existing fracture distributions and rock mechanical properties, which affect the optimized decisions for hydraulic fracturing. In this study, a surrogate-based approach is developed for efficient optimization of hydraulic fracturing well design in the presence of natural-system uncertainties. The fractal dimension is derived from the simulated fracturing network as the objective for maximizing energy recovery sweep efficiency. The surrogate model, which is constructed using training data from high-fidelity fracturing models for mapping the relationship between uncertain input parameters and the fractal dimension, provides fast approximation of the objective functions and constraints. A suite of surrogate models constructed using different fitting methods is evaluated and validated for fast predictions. Global sensitivity analysis is conducted to gain insights into the impact of the input variables on the output of interest, and further used for parameter screening. The high efficiency of the surrogate-based approach is demonstrated for three optimization scenarios with different and uncertain ambient conditions. Our results suggest the critical importance of considering uncertain pre-existing fracture networks in optimization studies of hydraulic fracturing. Abstract Copyright (2013) Elsevier, B.V. JF - Computers & Geosciences AU - Chen, Mingjie AU - Sun, Yunwei AU - Fu, Pengcheng AU - Carrigan, Charles R AU - Lu, Zhiming AU - Tong, Charles H AU - Buscheck, Thomas A Y1 - 2013/08// PY - 2013 DA - August 2013 SP - 69 EP - 79 PB - Elsevier, Amsterdam VL - 58 SN - 0098-3004, 0098-3004 KW - systems KW - hydraulic fracturing KW - data processing KW - optimization KW - petroleum KW - mechanical properties KW - simulation KW - reservoir rocks KW - models KW - geothermal energy KW - spatial distribution KW - fractures KW - geothermal reservoirs KW - naturally fractured reservoirs KW - mathematical methods KW - reservoir properties KW - water resources KW - fractals KW - permeability KW - 29A:Economic geology, geology of energy sources KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492586119?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Geosciences&rft.atitle=Surrogate-based+optimization+of+hydraulic+fracturing+in+pre-existing+fracture+networks&rft.au=Chen%2C+Mingjie%3BSun%2C+Yunwei%3BFu%2C+Pengcheng%3BCarrigan%2C+Charles+R%3BLu%2C+Zhiming%3BTong%2C+Charles+H%3BBuscheck%2C+Thomas+A&rft.aulast=Chen&rft.aufirst=Mingjie&rft.date=2013-08-01&rft.volume=58&rft.issue=&rft.spage=69&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Geosciences&rft.issn=00983004&rft_id=info:doi/10.1016%2Fj.cageo.2013.05.006 L2 - http://www.sciencedirect.com/science?_ob=JournalURL&_cdi=5840&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=e5198452fad934c6346f38b57511c8e0 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2014-01-01 N1 - Number of references - 42 N1 - Document feature - illus. incl. 3 tables N1 - Last updated - 2014-01-30 N1 - CODEN - GGEOD5 N1 - SubjectsTermNotLitGenreText - data processing; fractals; fractures; geothermal energy; geothermal reservoirs; hydraulic fracturing; mathematical methods; mechanical properties; models; naturally fractured reservoirs; optimization; permeability; petroleum; reservoir properties; reservoir rocks; simulation; spatial distribution; systems; water resources DO - http://dx.doi.org/10.1016/j.cageo.2013.05.006 ER - TY - JOUR T1 - On the analytic calculation of critical size for alpha prime precipitation in FeCr AN - 1475532886; 18796807 AB - We present a calculation of the critical sizes and nucleation rates for the nucleation of alpha' precipitates in an FeCr alloy. Our work combines the calculation of the FeCr free energy surface using molecular dynamics simulations with recently published data [1] for the interfacial free energies between the alpha and alpha' phases in FeCr to obtain thermodynamic and kinetic data on the nucleation in this system. The results are made available as a set of fitting functions and their parameters. JF - Journal of Nuclear Materials AU - Schwen, D AU - Martinez, E AU - Caro, A AD - Los Alamos National Laboratory, Los Alamos, NM 87545, United States, dschwen@lanl.gov Y1 - 2013/08// PY - 2013 DA - Aug 2013 SP - 180 EP - 184 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 439 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Thermodynamics KW - Energy KW - Kinetics KW - Radioactive materials KW - Simulation KW - Alloys KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1475532886?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=On+the+analytic+calculation+of+critical+size+for+alpha+prime+precipitation+in+FeCr&rft.au=Schwen%2C+D%3BMartinez%2C+E%3BCaro%2C+A&rft.aulast=Schwen&rft.aufirst=D&rft.date=2013-08-01&rft.volume=439&rft.issue=1-3&rft.spage=180&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Number of references - 20 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Thermodynamics; Kinetics; Energy; Radioactive materials; Alloys; Simulation ER - TY - JOUR T1 - In situ probing of the evolution of irradiation-induced defects in copper AN - 1475531162; 18796808 AB - Through in situ Cu(3+) ion irradiation at room temperature in a transmission electron microscope (TEM), we have investigated the evolution of defect clusters as a function of the radiation dose at different distances from the 3 {112} incoherent twin boundary (ITB) in Cu. Post in situ ion irradiation, high resolution TEM was used to explore the types of defects, which are composed of a high-density of vacancy stacking fault tetrahedra (SFT) and sparsely distributed interstitial Frank loops. During irradiation, defect clusters evolve through four stages: (i) incubation, (ii) non-interaction, (iii) interaction and (iv) saturation; and the corresponding density was observed to initially increase with irradiation dose and then approach saturation. No obvious denuded zone is observed along the 3 {112} ITB and the configuration of defects at the boundary displays as truncated SFTs. Several defect evolution models have been proposed to explain the observed phenomena. JF - Journal of Nuclear Materials AU - Li, N AU - Hattar, K AU - Misra, A AD - Los Alamos National Laboratory, Los Alamos, NM 87545, USA, nanli@lanl.gov Y1 - 2013/08// PY - 2013 DA - Aug 2013 SP - 185 EP - 191 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 439 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Irradiation KW - Radioactive materials KW - Temperature KW - Copper KW - ENA 14:Radiological Contamination UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1475531162?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=In+situ+probing+of+the+evolution+of+irradiation-induced+defects+in+copper&rft.au=Li%2C+N%3BHattar%2C+K%3BMisra%2C+A&rft.aulast=Li&rft.aufirst=N&rft.date=2013-08-01&rft.volume=439&rft.issue=1-3&rft.spage=185&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Number of references - 77 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Irradiation; Radioactive materials; Temperature; Copper ER - TY - JOUR T1 - Validation Test for CAP88 Predictions of Tritium Dispersion at Los Alamos National Laboratory AN - 1427003743; 18328151 AB - Gaussian plume models, such as CAP88, are used regularly for estimating downwind concentrations from stack emissions. At many facilities, the U.S. Environmental Protection Agency (U.S. EPA) requires that CAP88 be used to demonstrate compliance with air quality regulations for public protection from emissions of radionuclides. Gaussian plume models have the advantage of being relatively simple and their use pragmatic; however, these models are based on simplifying assumptions and generally they are not capable of incorporating dynamic meteorological conditions or complex topography. These limitations encourage validation tests to understand the capabilities and limitations of the model for the specific application. Los A lamos National Laboratory (LANL) has complex topography but is required to use CAP88 for compliance with the Clean Air Act Subpart H. The purpose of this study was to test the accuracy of the CAP88 predictions against ambient air measurements using released tritium as a tracer. Stack emissions of tritium from two LANL stacks were measured and the dispersion modeled with CAP88 using local meteorology. Ambient air measurements of tritium were made at various distances and directions from the stacks. Model predictions and ambient air measurements were compared over the course of a full year's data. Comparative results were consistent with other studies and showed the CAP88 predictions of downwind tritium concentrations were on average about three times higher than those measured, and the accuracy of the model predictions were generally more consistent for annual averages than for bi-weekly data. JF - Health Physics AU - Michelotti, E AU - Green, A AU - Whicker, J AU - Eisele, W AU - Fuehne, D AU - McNaughton, M Y1 - 2013/08// PY - 2013 DA - Aug 2013 SP - S176 EP - S181 VL - 105 IS - 2 SN - 0017-9078, 0017-9078 KW - Pollution Abstracts KW - Prediction KW - EPA KW - USA KW - Tritium KW - Compliance KW - Air quality KW - USA, New Mexico, Los Alamos KW - Stack emissions KW - Plumes KW - Wind KW - Topography KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1427003743?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=Validation+Test+for+CAP88+Predictions+of+Tritium+Dispersion+at+Los+Alamos+National+Laboratory&rft.au=Michelotti%2C+E%3BGreen%2C+A%3BWhicker%2C+J%3BEisele%2C+W%3BFuehne%2C+D%3BMcNaughton%2C+M&rft.aulast=Michelotti&rft.aufirst=E&rft.date=2013-08-01&rft.volume=105&rft.issue=2&rft.spage=S176&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-08-01 N1 - Last updated - 2015-05-27 N1 - SubjectsTermNotLitGenreText - Prediction; EPA; Tritium; Compliance; Air quality; Stack emissions; Plumes; Wind; Topography; USA; USA, New Mexico, Los Alamos ER - TY - JOUR T1 - Breakthrough of contaminant plumes in saturated volcanic rock: implications from the Yucca Mountain site AN - 1419369159; 18306391 AB - This manuscript addresses the topic of transverse dispersion and its impact on the behavior of the saturated zone below Yucca Mountain, a site that had been proposed for a US nuclear waste repository. Guided by a review of relevant observations of dispersion in similar formations, this study evaluates the importance of uncertainty in dispersion, particularly dispersion transverse to the mean transport direction, on metrics of interest to the Yucca Mountain risk assessment. Although as expected, larger values of transverse dispersivity lead to greater spreading of the plume in directions orthogonal to the mean flow direction, a corresponding sensitivity is not observed to the travel time statistics of the breakthrough curve at the compliance boundary. Thus, when a risk assessment is based on contaminant mass flux at compliance well or 'fence line' downstream from the source, as in the Yucca Mountain case, transverse dispersion may be of secondary importance to other parameters that more directly impact travel times. This result is in contrast to systems in which reactive transport processes are important to the attenuation of the plume, in which case transverse dispersion and mixing may be expected to play a dominant role in controlling the reaction rates and contaminant concentrations in the plume. Contaminant plumes with significant lateral spreading indicating transverse dispersion have been reported in the literature from many sites. At the Yucca Mountain site modeling shows that changing the value of transverse dispersivity from 0.05 to 10 m lead to wider plumes, but the effect was moderate with the length to width ratio changing from 12 to 25, and the median breakthrough time at 18 km downstream from the source changing from 980 to 3000 years. JF - Geofluids AU - Kelkar, S AU - Srinivasan, G AU - Robinson, BA AU - Roback, R AU - Viswanathan, H AU - Rehfeldt, K AU - Tucci, P AD - Los Alamos National Laboratory Y1 - 2013/08// PY - 2013 DA - August 2013 SP - 273 EP - 282 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 13 IS - 3 SN - 1468-8115, 1468-8115 KW - Pollution Abstracts; Risk Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Risk assessment KW - Statistics KW - USA, Nevada, Yucca Mt. KW - Compliance KW - Pollution dispersion KW - Mountains KW - Pollutants KW - Assessments KW - Downstream KW - Transport processes KW - Plumes KW - Volcanic rocks KW - Radioactive wastes KW - Traveltime KW - Risk KW - Reviews KW - Contaminants KW - Dispersion KW - SW 5010:Network design KW - Q2 09223:Optical properties KW - P 9000:ENVIRONMENTAL ACTION KW - R2 23050:Environment UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1419369159?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Guidebook+-+New+Mexico+Geological+Society&rft.atitle=Chimaja%3B+spring-parsley+of+the+desert&rft.au=Sickafus%2C+Kurt+E&rft.aulast=Sickafus&rft.aufirst=Kurt&rft.date=2011-01-01&rft.volume=62&rft.issue=&rft.spage=44&rft.isbn=9781585460977&rft.btitle=&rft.title=Guidebook+-+New+Mexico+Geological+Society&rft.issn=00778567&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-08-01 N1 - Last updated - 2016-02-04 N1 - SubjectsTermNotLitGenreText - Volcanic rocks; Pollution dispersion; Radioactive wastes; Transport processes; Dispersion; Risk assessment; Mountains; Reviews; Compliance; Downstream; Contaminants; Plumes; Risk; Statistics; Assessments; Pollutants; Traveltime; USA, Nevada, Yucca Mt. DO - http://dx.doi.org/10.1111/gfl.12035 ER - TY - JOUR T1 - Hydrologic control of the oxygen isotope ratio of ecosystem respiration in a semi-arid woodland AN - 1427011888; 18322437 AB - We conducted high frequency measurements of the delta super(18)O value of atmospheric CO sub(2) from a juniper (Juniperus monosperma) woodland in New Mexico, USA, over a four-year period to investigate climatic and physiological regulation of the delta super(18)O value of ecosystem respiration ( delta sub(R)). Rain pulses reset delta sub(R) with the dominant water source isotope composition, followed by progressive enrichment of delta sub(R). Transpiration (E sub(T)) was significantly related to post-pulse delta sub(R) enrichment because the leaf water delta super(18)O value showed strong enrichment with increasing vapor pressure deficit that occurs following rain. Post-pulse delta sub(R) enrichment was correlated with both E sub(T) and the ratio of E sub(T) to soil evaporation (E sub(T)/E sub(S)). In contrast, the soil water delta super(18)O value was relatively stable and delta sub(R) enrichment was not correlated with E sub(S). Model simulations captured the large post-pulse delta sub(R) enrichments only when the offset between xylem and leaf water delta super(18)O value was modeled explicitly and when a gross flux model for CO sub(2) retro-diffusion was included. Drought impacts delta sub(R) through the balance between evaporative demand, which enriches delta sub(R), and low soil moisture availability, which attenuates delta sub(R) enrichment through reduced E sub(T). The net result, observed throughout all four years of our study, was a negative correlation of post-precipitation delta sub(R) enrichment with increasing drought. JF - Biogeosciences AU - Shim, J H AU - Powers, H H AU - Meyer, C W AU - Knohl, A AU - Dawson, TE AU - Riley, W J AU - Pockman, W T AU - McDowell, N AD - Earth and Environmental Sciences Division, Los Alamos National Laboratory, MS-J495, Los Alamos, NM 87545, USA Y1 - 2013/07/23/ PY - 2013 DA - 2013 Jul 23 SP - 4937 EP - 4956 PB - European Geosciences Union, c/o E.O.S.T. Strasbourg Cedex 67084 France VL - 10 IS - 7 SN - 1726-4170, 1726-4170 KW - Ecology Abstracts; Meteorological & Geoastrophysical Abstracts KW - Isotopes KW - Evaporation KW - Respiration KW - Correlations KW - Drought KW - Models KW - Vapors KW - Evaporation from soil KW - Water sources KW - Pressure KW - Droughts KW - USA, New Mexico KW - Xylem KW - Soil moisture availability KW - Leaves KW - Transpiration KW - Oxygen isotopes KW - Oxygen KW - Numerical simulations KW - Rain KW - Juniperus monosperma KW - Soil moisture KW - Carbon dioxide KW - Vapor pressure KW - D 04040:Ecosystem and Ecology Studies KW - M2 556.13:Evaporation/Evapotranspiration (556.13) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1427011888?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Biogeosciences&rft.atitle=Hydrologic+control+of+the+oxygen+isotope+ratio+of+ecosystem+respiration+in+a+semi-arid+woodland&rft.au=Shim%2C+J+H%3BPowers%2C+H+H%3BMeyer%2C+C+W%3BKnohl%2C+A%3BDawson%2C+TE%3BRiley%2C+W+J%3BPockman%2C+W+T%3BMcDowell%2C+N&rft.aulast=Shim&rft.aufirst=J&rft.date=2013-07-23&rft.volume=10&rft.issue=7&rft.spage=4937&rft.isbn=&rft.btitle=&rft.title=Biogeosciences&rft.issn=17264170&rft_id=info:doi/10.5194%2Fbg-10-4937-2013 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-08-01 N1 - Last updated - 2013-09-20 N1 - SubjectsTermNotLitGenreText - Isotopes; Evaporation; Xylem; Respiration; Leaves; Transpiration; Models; Oxygen; Vapors; Rain; Pressure; Carbon dioxide; Soil moisture; Droughts; Oxygen isotopes; Numerical simulations; Evaporation from soil; Soil moisture availability; Correlations; Water sources; Drought; Vapor pressure; Juniperus monosperma; USA, New Mexico DO - http://dx.doi.org/10.5194/bg-10-4937-2013 ER - TY - JOUR T1 - Chemical explosion experiments to improve nuclear test monitoring AN - 1510394369; 2014-019363 AB - A series of chemical explosions, called the Source Physics Experiments (SPE, see Table), is being conducted under the auspices of the U.S. Department of Energy's National Nuclear Security Administration (NNSA) to develop a new, more physics-based paradigm for nuclear test monitoring. Improvements in technical capabilities resulting from such development have the potential to help the United States keep better tabs on underground nuclear tests being conducted worldwide and to enhance treaty monitoring. Abstract Copyright This paper is not subject to U.S. copyright. Published in 2013 by the American Geophysical Union. JF - Eos, Transactions, American Geophysical Union AU - Snelson, Catherine M AU - Abbott, Robert E AU - Broome, Scott T AU - Mellors, Robert J AU - Patton, Howard J AU - Sussman, Aviva J AU - Townsend, Margaret J AU - Walter, William R Y1 - 2013/07/02/ PY - 2013 DA - 2013 Jul 02 SP - 237 EP - 239 PB - American Geophysical Union, Washington, DC VL - 94 IS - 27 SN - 0096-3941, 0096-3941 KW - bedrock KW - body waves KW - monitoring KW - numerical models KW - explosions KW - igneous rocks KW - granites KW - data processing KW - prediction KW - elastic waves KW - seismic sources KW - plutonic rocks KW - digital simulation KW - propagation KW - seismic waves KW - seismic networks KW - nuclear explosions KW - S-waves KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1510394369?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Eos%2C+Transactions%2C+American+Geophysical+Union&rft.atitle=Chemical+explosion+experiments+to+improve+nuclear+test+monitoring&rft.au=Snelson%2C+Catherine+M%3BAbbott%2C+Robert+E%3BBroome%2C+Scott+T%3BMellors%2C+Robert+J%3BPatton%2C+Howard+J%3BSussman%2C+Aviva+J%3BTownsend%2C+Margaret+J%3BWalter%2C+William+R&rft.aulast=Snelson&rft.aufirst=Catherine&rft.date=2013-07-02&rft.volume=94&rft.issue=27&rft.spage=237&rft.isbn=&rft.btitle=&rft.title=Eos%2C+Transactions%2C+American+Geophysical+Union&rft.issn=00963941&rft_id=info:doi/10.1002%2F2013EO270002 L2 - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%292324-9250 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 5 N1 - PubXState - DC N1 - Document feature - 1 table N1 - Last updated - 2014-03-27 N1 - CODEN - EOSTAJ N1 - SubjectsTermNotLitGenreText - bedrock; body waves; data processing; digital simulation; elastic waves; explosions; granites; igneous rocks; monitoring; nuclear explosions; numerical models; plutonic rocks; prediction; propagation; S-waves; seismic networks; seismic sources; seismic waves DO - http://dx.doi.org/10.1002/2013EO270002 ER - TY - JOUR T1 - Expansion of the analytical window for oil spill characterization by ultrahigh resolution mass spectrometry: beyond gas chromatography. AN - 1381100931; 23692145 AB - Traditional tools for routine environmental analysis and forensic chemistry of petroleum have relied almost exclusively on gas chromatography-mass spectrometry (GC-MS), although many compounds in crude oil (and its transformation products) are not chromatographically separated or amenable to GC-MS due to volatility. To enhance current and future studies on the fate, transport, and fingerprinting of the Macondo well oil released from the 2010 Deepwater Horizon disaster, we created an extensive molecular library of the unadulterated petroleum to compare to a tar ball collected on the beach of Louisiana. We apply ultrahigh resolution Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry to identify compositional changes at the molecular level between native and weathered crude oil samples and reveal enrichment in polar compounds inaccessible by GC-based characterization. The outlined approach provides unprecedented detail with the potential to enhance insight into the environmental fate of spilled oil, improved toxicology, molecular modeling of biotic/abiotic weathering, and comprehensive molecular characterization for petroleum-derived releases. Here, we characterize more than 30,000 acidic, basic, and nonpolar unique neutral elemental compositions for the Macondo well crude oil, to provide an archive for future chemical analyses of the environmental consequences of the oil spill. JF - Environmental science & technology AU - McKenna, Amy M AU - Nelson, Robert K AU - Reddy, Christopher M AU - Savory, Joshua J AU - Kaiser, Nathan K AU - Fitzsimmons, Jade E AU - Marshall, Alan G AU - Rodgers, Ryan P AD - National High Magnetic Field Laboratory, Florida State University, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310-4005, United States. mckenna@magnet.fsu.edu Y1 - 2013/07/02/ PY - 2013 DA - 2013 Jul 02 SP - 7530 EP - 7539 VL - 47 IS - 13 KW - Petroleum KW - 0 KW - Index Medicus KW - Chromatography, Gas KW - Petroleum Pollution -- analysis KW - Petroleum -- analysis KW - Mass Spectrometry -- methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1381100931?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Relative+stability+and+significance+of+dawsonite+and+aluminum+minerals+in+geologic+carbon+sequestration&rft.au=Kaszuba%2C+John+P%3BViswanathan%2C+Hari+S%3BCarey%2C+J+William&rft.aulast=Kaszuba&rft.aufirst=John&rft.date=2011-01-01&rft.volume=38&rft.issue=8&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2011GL046845 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2014-04-21 N1 - Date created - 2013-07-02 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/es305284t ER - TY - JOUR T1 - Silicon carbide grains of type C provide evidence for the production of the unstable isotope (super 32) Si in supernovae AN - 1832645948; 677375-7 AB - Carbon-rich grains are observed to condense in the ejecta of recent core-collapse supernovae (SNe) within a year after the explosion. Silicon carbide grains of type X are C-rich grains with isotopic signatures of explosive SN nucleosynthesis have been found in primitive meteorites. Much rarer silicon carbide grains of type C are a special sub-group of SiC grains from SNe. They show peculiar abundance signatures for Si and S, isotopically heavy Si, and isotopically light S, which appear to be in disagreement with model predictions. We propose that C grains are formed mostly from C-rich stellar material exposed to lower SN shock temperatures than the more common type X grains. In this scenario, extreme (super 32) S enrichments observed in C grains may be explained by the presence of short-lived (super 32) Si (tau (sub 1/2) = 153 yr) in the ejecta, produced by neutron capture processes starting from the stable Si isotopes. No mixing from deeper Si-rich material and/or fractionation of Si from S due to molecular chemistry is needed to explain the (super 32) S enrichments. The abundance of (super 32) Si in the grains can provide constraints on the neutron density reached during the SN explosion in the C-rich He shell material. The impact of the large uncertainty of the neutron capture cross sections in the (super 32) Si region is discussed. Copyright (Copyright) 2013. The American Astronomical Society. All rights reserved. JF - The Astrophysical Journal. Letters AU - Pignatari, M AU - Zinner, E AU - Bertolli, M G AU - Trappitsch, R AU - Hoppe, P AU - Rauscher, T AU - Fryer, C AU - Herwig, F AU - Hirschi, R AU - Timmes, F X AU - Thielemann, F K Y1 - 2013/07/01/ PY - 2013 DA - 2013 Jul 01 EP - Paper no. L7 PB - IOP Publishing, Bristol VL - 771 IS - 1 SN - 2041-8205, 2041-8205 KW - isotopes KW - isotope ratios KW - supernovas KW - Si-32 KW - neutron capture KW - S-32 KW - cosmochemistry KW - nucleosynthesis KW - X grains KW - silicon KW - stable isotopes KW - short-lived isotopes KW - radioactive isotopes KW - silicon carbide KW - presolar grains KW - stars KW - carbon KW - C grains KW - sulfur KW - Si-32/Si-28 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832645948?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Astrophysical+Journal.+Letters&rft.atitle=Silicon+carbide+grains+of+type+C+provide+evidence+for+the+production+of+the+unstable+isotope+%28super+32%29+Si+in+supernovae&rft.au=Pignatari%2C+M%3BZinner%2C+E%3BBertolli%2C+M+G%3BTrappitsch%2C+R%3BHoppe%2C+P%3BRauscher%2C+T%3BFryer%2C+C%3BHerwig%2C+F%3BHirschi%2C+R%3BTimmes%2C+F+X%3BThielemann%2C+F+K&rft.aulast=Pignatari&rft.aufirst=M&rft.date=2013-07-01&rft.volume=771&rft.issue=1&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+Astrophysical+Journal.+Letters&rft.issn=20418205&rft_id=info:doi/10.1088%2F2041-8205%2F771%2F1%2FL7 L2 - http://iopscience.iop.org/2041-8205 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Number of references - 32 N1 - Document feature - illus. N1 - Last updated - 2017-01-24 N1 - SubjectsTermNotLitGenreText - C grains; carbon; cosmochemistry; isotope ratios; isotopes; neutron capture; nucleosynthesis; presolar grains; radioactive isotopes; S-32; short-lived isotopes; Si-32; Si-32/Si-28; silicon; silicon carbide; stable isotopes; stars; sulfur; supernovas; X grains DO - http://dx.doi.org/10.1088/2041-8205/771/1/L7 ER - TY - JOUR T1 - Adjoint-Based k-Eigenvalue Sensitivity Coefficients to Nuclear Data Using Continuous-Energy Monte Carlo AN - 1671487608; 18638169 AB - A continuous-energy Monte Carlo method is developed to compute adjoint-based k-eigenvalue sensitivity coefficients with respect to nuclear data. The method is implemented into MCNP6 and is based upon similar methodologies used to compute other adjoint-weighted quantities. The Monte Carlo tallies employed are explained. Verification of the method is performed by comparing results to analytic solutions, direct density perturbations, and those from other software packages such as TSUNAMI-3D and MONK. Results of analytic solutions agree within a few tenths of a percent. Direct density perturbations and comparisons with other software generally agree within a few percent. JF - Nuclear Science and Engineering AU - Kiedrowski, Brian C AU - Brown, Forrest B AD - Los Alamos National Laboratory, X-Computational Physics Division P O Box 1663, MS A143, Los Alamos, New Mexico 87545 Y1 - 2013/07// PY - 2013 DA - Jul 2013 SP - 227 EP - 244 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 174 IS - 3 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Software KW - Computer programs KW - Computer simulation KW - Monte Carlo methods KW - Density KW - Software packages KW - Perturbation methods KW - Exact solutions UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671487608?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Adjoint-Based+k-Eigenvalue+Sensitivity+Coefficients+to+Nuclear+Data+Using+Continuous-Energy+Monte+Carlo&rft.au=Kiedrowski%2C+Brian+C%3BBrown%2C+Forrest+B&rft.aulast=Kiedrowski&rft.aufirst=Brian&rft.date=2013-07-01&rft.volume=174&rft.issue=3&rft.spage=227&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Number of references - 21 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - The role of non-stoichiometric defects in radiation damage evolution of SrTiO sub(3) AN - 1567058287; 20518593 AB - The response of polycrystalline SrTiO sub(3), fabricated by the flash sintering method, to ion beam irradiation was investigated by means of transmission electron microscopy (TEM) and atomic scale modeling. The samples were implanted with 250 keV Ne ions at fluences between 1.11 10 super(16) and 2.25 10 super(16) ions per cm super(2) at room temperature and then characterized using scanning transmission electron microscopy and high voltage TEM. We observed that this material has a large number of Ruddlesden-Popper (RP) faults, related to the non-stoichiometry of the material, in a random and sometimes complicated arrangement. These faults have a significant impact on the radiation damage evolution of the material. In particular, the faults amorphize more quickly than the surrounding SrTiO sub(3) matrix. We examined the interaction of point defects with the RP faults using atomistic modeling and determined that both the thermodynamic and kinetic properties of defects are significantly influenced by the presence of the faults, providing insight into the experimental observations. We conclude that planar defects such as RP faults can have a significant impact on the radiation damage evolution of SrTiO sub(3) and might be one avenue for controlling radiation tolerance in complex materials. JF - Journal of materials chemistry. A, Materials for energy and sustainability AU - Won, Jonghan AU - Vernon, Louis J AU - Karakuscu, Aylin AU - Dickerson, Robert M AU - Cologna, Marco AU - Raj, Rishi AU - Wang, Yongqiang AU - Yoo, Seung Jo AU - Lee, Seok-Hoon AU - Misra, Amit AU - Uberuaga, Blas P AD - Materials Science and Technology Division; Los Alamos National Laboratory; Los Alamos; New Mexico 87545; USA; , blas@lanl.gov Y1 - 2013/07// PY - 2013 DA - Jul 2013 SP - 9235 EP - 9245 PB - Royal Society of Chemistry VL - 1 IS - 32 SN - 2050-7488, 2050-7488 KW - Sustainability Science Abstracts KW - Ions KW - Radiation KW - Thermodynamics KW - Kinetics KW - Energy KW - Irradiation KW - Microscopy KW - Temperature KW - Sustainability KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1567058287?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+materials+chemistry.+A%2C+Materials+for+energy+and+sustainability&rft.atitle=The+role+of+non-stoichiometric+defects+in+radiation+damage+evolution+of+SrTiO+sub%283%29&rft.au=Won%2C+Jonghan%3BVernon%2C+Louis+J%3BKarakuscu%2C+Aylin%3BDickerson%2C+Robert+M%3BCologna%2C+Marco%3BRaj%2C+Rishi%3BWang%2C+Yongqiang%3BYoo%2C+Seung+Jo%3BLee%2C+Seok-Hoon%3BMisra%2C+Amit%3BUberuaga%2C+Blas+P&rft.aulast=Won&rft.aufirst=Jonghan&rft.date=2013-07-01&rft.volume=1&rft.issue=32&rft.spage=9235&rft.isbn=&rft.btitle=&rft.title=Journal+of+materials+chemistry.+A%2C+Materials+for+energy+and+sustainability&rft.issn=20507488&rft_id=info:doi/10.1039%2Fc3ta11046j LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-10-01 N1 - Number of references - 44 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Ions; Thermodynamics; Radiation; Irradiation; Energy; Kinetics; Microscopy; Temperature; Sustainability DO - http://dx.doi.org/10.1039/c3ta11046j ER - TY - JOUR T1 - A Cellwise Block-Gauss-Seidel Iterative Method for Multigroup S(N) Transport on a Hybrid Parallel Computer Architecture AN - 1448741233; 18638168 AB - A Fourier analysis is conducted in two-dimensional (2-D) geometry for the discrete ordinates (S(N)) approximation of the neutron transport problem solved with Richardson iteration (source iteration) using the cellwise block-Jacobi (bJ) and block-Gauss-Seidel (bGS) algorithms. The results of the Fourier analysis show that convergence of bJ can degrade, leading to a spectral radius rho equal to 1, in problems containing optically thin cells. For problems containing cells that are optically thick, instead, rho tends to 0. Hence, in the optically-thick-cell regime, bJ is rapidly convergent even for scattering-dominated problems. Similar conclusions hold for bGS, except bGS approaches the asymptotic, thick-cell regime at convergence rates higher than bJ. Hence, we have implemented the bGS algorithm on the Roadrunner hybrid, parallel computer architecture. A compute node of this massively parallel machine comprises AMD Opteron cores that are linked to a Cell Broadband Engine (Cell/B.E.). LAPACK routines have been ported to the Cell/B.E. in order to make use of its parallel synergistic processing elements (SPEs). The bGS algorithm is based on the LU factorization and solution of a linear system that couples the fluxes for all SN angles and energy groups on a mesh cell. For every cell of a mesh that has been parallel decomposed on the higher-level Opteron processors, a linear system is transferred to the Cell/B.E. and the parallel LAPACK routines are used to compute a solution, which is then transferred back to the Opteron, where the rest of the SN transport computations take place. Compared to standard parallel machines, a one-hundred-fold speedup of the bGS was observed on Roadrunner. Numerical experiments with strong and weak parallel scaling demonstrate that the bGS method is viable and compares favorably to full parallel transport sweeps (FPS) on 2-D unstructured meshes when it is applied to optically thick, multi-material problems. Specifically, the strong parallel efficiency of accelerated bGS on Roadrunner can achieve 73% at 512 processors, compared with 32 processors, while efficiency is 34% for the (Opteron-only) implementation of FPS. The weak parallel efficiency of bGS is 58% while it reaches 10% for FPS. As expected, however, bGS is not as efficient as FPS in optically thin problems. JF - Nuclear Science and Engineering AU - Rosa, Massimiliano AU - Warsa, James S AU - Perks, Michael AD - Los Alamos National Laboratory, Computational Physics and Methods Group, Los Alamos, New Mexico 87545 maxrosa@lanl.gov Y1 - 2013/07// PY - 2013 DA - Jul 2013 SP - 209 EP - 226 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 174 IS - 3 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); Computer and Information Systems Abstracts (CI); CSA / ASCE Civil Engineering Abstracts (CE) KW - Processors KW - Mathematical models KW - Blocking KW - Transport KW - Algorithms KW - Iterative methods KW - Routines KW - Linear systems UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448741233?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=A+Cellwise+Block-Gauss-Seidel+Iterative+Method+for+Multigroup+S%28N%29+Transport+on+a+Hybrid+Parallel+Computer+Architecture&rft.au=Rosa%2C+Massimiliano%3BWarsa%2C+James+S%3BPerks%2C+Michael&rft.aulast=Rosa&rft.aufirst=Massimiliano&rft.date=2013-07-01&rft.volume=174&rft.issue=3&rft.spage=209&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Number of references - 18 N1 - Last updated - 2013-11-06 ER - TY - JOUR T1 - Hydrogeologic controls on induced seismicity in crystalline basement rocks due to fluid injection into basal reservoirs AN - 1447102267; 2013-084802 AB - A series of M (sub b) 3.8-5.5 induced seismic events in the midcontinent region, United States, resulted from injection of fluid either into a basal sedimentary reservoir with no underlying confining unit or directly into the underlying crystalline basement complex. The earthquakes probably occurred along faults that were likely critically stressed within the crystalline basement. These faults were located at a considerable distance (up to 10 km) from the injection wells and head increases at the hypocenters were likely relatively small ( approximately 70-150 m). We present a suite of simulations that use a simple hydrogeologic-geomechanical model to assess what hydrogeologic conditions promote or deter induced seismic events within the crystalline basement across the midcontinent. The presence of a confining unit beneath the injection reservoir horizon had the single largest effect in preventing induced seismicity within the underlying crystalline basement. For a crystalline basement having a permeability of 2 X 10 (super -17) m (super 2) and specific storage coefficient of 10 (super -7) /m, injection at a rate of 5455 m (super 3) /d into the basal aquifer with no underlying basal seal over 10 years resulted in probable brittle failure to depths of about 0.6 km below the injection reservoir. Including a permeable (k (sub z) = 10 (super -13) m (super 2) ) Precambrian normal fault, located 20 m from the injection well, increased the depth of the failure region below the reservoir to 3 km. For a large permeability contrast between a Precambrian thrust fault (10 (super -12) m (super 2) ) and the surrounding crystalline basement (10 (super -18) m (super 2) ), the failure region can extend laterally 10 km away from the injection well. Abstract Copyright (2013), , National Ground Water Association. JF - Ground Water AU - Zhang, Yipeng AU - Person, Mark AU - Rupp, John AU - Ellett, Kevin AU - Celia, Michael A AU - Gable, Carl W AU - Bowen, Brenda AU - Evans, James AU - Bandilla, Karl AU - Mozley, Peter AU - Dewers, Thomas AU - Elliot, Thomas Y1 - 2013/07// PY - 2013 DA - July 2013 SP - 525 EP - 538 PB - Wiley-Blackwell on behalf of National Ground Water Association, Westerville, OH VL - 51 IS - 4 SN - 0017-467X, 0017-467X KW - United States KW - hazardous waste KW - paleoseismicity KW - hydrogeology KW - waterflooding KW - oil and gas fields KW - ground water KW - carbon dioxide KW - oil wells KW - controls KW - fluid injection KW - Indiana KW - crystalline rocks KW - focus KW - induced earthquakes KW - faults KW - Ohio KW - Illinois Basin KW - failures KW - Enders Fault KW - carbon sequestration KW - numerical models KW - Illinois KW - three-dimensional models KW - Paleozoic KW - injection KW - basement KW - pollution KW - equations KW - Ozark Aquifer KW - boundary conditions KW - aquifers KW - models KW - Magdalena Group KW - risk assessment KW - waste disposal KW - water wells KW - earthquakes KW - permeability KW - Arkansas KW - Midwest KW - 19:Seismology KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1447102267?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Ground+Water&rft.atitle=Hydrogeologic+controls+on+induced+seismicity+in+crystalline+basement+rocks+due+to+fluid+injection+into+basal+reservoirs&rft.au=Zhang%2C+Yipeng%3BPerson%2C+Mark%3BRupp%2C+John%3BEllett%2C+Kevin%3BCelia%2C+Michael+A%3BGable%2C+Carl+W%3BBowen%2C+Brenda%3BEvans%2C+James%3BBandilla%2C+Karl%3BMozley%2C+Peter%3BDewers%2C+Thomas%3BElliot%2C+Thomas&rft.aulast=Zhang&rft.aufirst=Yipeng&rft.date=2013-07-01&rft.volume=51&rft.issue=4&rft.spage=525&rft.isbn=&rft.btitle=&rft.title=Ground+Water&rft.issn=0017467X&rft_id=info:doi/10.1111%2Fgwat.12071 L2 - http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1745-6584 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 58 N1 - PubXState - OH N1 - Document feature - illus. incl. 2 tables, geol. sketch maps N1 - Last updated - 2016-10-25 N1 - CODEN - GRWAAP N1 - SubjectsTermNotLitGenreText - aquifers; Arkansas; basement; boundary conditions; carbon dioxide; carbon sequestration; controls; crystalline rocks; earthquakes; Enders Fault; equations; failures; faults; fluid injection; focus; ground water; hazardous waste; hydrogeology; Illinois; Illinois Basin; Indiana; induced earthquakes; injection; Magdalena Group; Midwest; models; numerical models; Ohio; oil and gas fields; oil wells; Ozark Aquifer; paleoseismicity; Paleozoic; permeability; pollution; risk assessment; three-dimensional models; United States; waste disposal; water wells; waterflooding DO - http://dx.doi.org/10.1111/gwat.12071 ER - TY - JOUR T1 - The Importance of Natural Variability in Lake Areas on the Detection of Permafrost Degradation: A Case Study in the Yukon Flats, Alaska AN - 1439237533; 18563586 AB - Long-term lake area change has previously been measured to detect the temporal rate and spatial extent of permafrost degradation. However, the natural intra- and interannual variability of lake areas has not been considered explicitly and quantitatively, which can substantially interfere with the detection of long-term lake area change associated with permafrost degradation. In order to better understand the natural background variability of lake areas, we used Landsat 7 images obtained on 11 dates from 1999 to 2002 to quantify the intra- and interannual lake area variability for a 4224 km super(2) study area within the Yukon Flats, Alaska. Total lake areas ranged from 179 km super(2) (22 August 1999) to 326 km super(2) (6 June 2000). Even within a single year (year 2000), the total lake area decreased by 42 per cent from 6 June to 16 August, well exceeding the previously reported trends for long-term decrease (14% and 18%) for the Yukon Flats. Both intra- and interannual area variability in August and September were smaller than in June and July, suggesting that images from later in summer are more reliable for detecting long-term change in lake area. Variability of no-closure lakes was twice that of closed-basin lakes. Intra-annual area changes in closed-basin lakes can be explained by the intra-annual water balance, defined as cumulative precipitation minus evaporation between two consecutive dates within the same year. For a given period, the total lake area was correlated more strongly with the water balance since the preceding October than with the water balance in the preceding 12 months. Spatial heterogeneity in the intra-annual area change of individual lakes was observed, which might be caused by different topographical, geological and permafrost characteristics around and beneath the lakes. JF - Permafrost and Periglacial Processes AU - Chen, Min AU - Rowland, Joel C AU - Wilson, Cathy J AU - Altmann, Garrett L AU - Brumby, Steven P AD - Division of Earth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, NM, USA. Y1 - 2013/07// PY - 2013 DA - Jul 2013 SP - 224 EP - 240 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 24 IS - 3 SN - 1045-6740, 1045-6740 KW - ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Aqualine Abstracts; Meteorological & Geoastrophysical Abstracts KW - Variability KW - Salinity variations KW - Degradation KW - Evaporation KW - Hydrologic Budget KW - Permafrost KW - LANDSAT KW - Lakes KW - Heterogeneity KW - USA, Alaska KW - Temporal variations KW - Case Studies KW - Natural variability KW - Precipitation KW - Water balance KW - Interannual variability KW - Long-term changes KW - Spatial Heterogeneity KW - SW 5010:Network design KW - AQ 00006:Sewage KW - Q2 09402:Freshwater from the sea KW - M2 556.13:Evaporation/Evapotranspiration (556.13) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1439237533?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Permafrost+and+Periglacial+Processes&rft.atitle=The+Importance+of+Natural+Variability+in+Lake+Areas+on+the+Detection+of+Permafrost+Degradation%3A+A+Case+Study+in+the+Yukon+Flats%2C+Alaska&rft.au=Chen%2C+Min%3BRowland%2C+Joel+C%3BWilson%2C+Cathy+J%3BAltmann%2C+Garrett+L%3BBrumby%2C+Steven+P&rft.aulast=Chen&rft.aufirst=Min&rft.date=2013-07-01&rft.volume=24&rft.issue=3&rft.spage=224&rft.isbn=&rft.btitle=&rft.title=Permafrost+and+Periglacial+Processes&rft.issn=10456740&rft_id=info:doi/10.1002%2Fppp.1783 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-10-01 N1 - Last updated - 2014-05-15 N1 - SubjectsTermNotLitGenreText - Water balance; Temporal variations; Long-term changes; Permafrost; Spatial Heterogeneity; Interannual variability; Salinity variations; Evaporation; Natural variability; LANDSAT; Precipitation; Variability; Lakes; Degradation; Case Studies; Hydrologic Budget; Heterogeneity; USA, Alaska DO - http://dx.doi.org/10.1002/ppp.1783 ER - TY - JOUR T1 - RADIATION SAFETY ASPECTS OF NANOTECHNOLOGY: UPDATE ON DEVELOPMENT OF AN NCRP COMMENTARY AN - 1412552105; 18229202 AB - The National Council on Radiation Protection and Measurements (NCRP) has established NCRP Scientific Committee 2-6 to develop a commentary on the current state of knowledge and guidance for radiation safety programs involved with nanotechnology. NCRP originated in 1929 and was congressionally chartered in 1964 under U.S. Public Law 88-376 as a not-for-profit service organization to serve in the nation's public interest for collecting, analyzing, and disseminating the latest scientific information about radiation protection and measurement. NCRP cooperates with national and international governmental and private organizations to facilitate the effective use of combined resources to further develop the basic concepts of radiation protection and measurement. Areas of interest for the commentary include programs where radiation is being used to characterize or alter materials at the nanoscale level, radiolabelling of nanomaterials for tracking or evaluation of physicochemical and biological behavior, and the use of nano-formulated materials in situations involving radiation or radioactivity. The commentary's focus places strong emphasis on practical operational information for management, radiation safety officers, operational health physicists, dosimetrists, workers, and regulators. Information applicable to the radiation safety aspects of nanotechnology has been derived from studying naturally occurring nanoparticles, ultrafine aerosols of actinides, and aerosols from atmospheric testing. An analysis is being performed on how traditional health physics program practices may need to be modified to provide adequate safety for those working with radioactive nanomaterials and nanotechnology applications involving radiation. Knowledge gaps are being identified regarding information needed to implement a comprehensive and effective radiation safety program. The commentary intends to provide guidance on contamination control, engineered and administrative controls; personal protective equipment, including respiratory protection; performance of safety training; waste disposal; and emergency response. The commentary also intends to provide specific guidance on conducting internal dosimetry programs if nanomaterials are being handled. Possible differences in the biological uptake and in vivo dissolution or translocation of radioactive nanoparticles, compared to more commonly encountered micrometer-sized particles, may impact the design and conduct of internal monitoring programs and dose calculation methods. Model parameters and other considerations are being assessed including: how nanometer-sized particles are addressed in current respiratory tract and systemic biological models; deposition efficiency, total and regional retention patterns, and cells and tissues at risk; and the potential for multifactorial biological effects from radiation, chemical, and physical particle properties of the nanoparticles. Finally, it is intended that the approaches taken to develop the commentary will be an example to the broader nanotechnology knowledge infrastructure community on how to determine which information is relevant, and then to collect, validate, store, share, mine, analyze, model, and apply that information for the efficient use of future work in the area of nanotechnology safety. It is expected that preparation of the commentary will take about 12 months. JF - Health Physics AU - Hoover, M AU - Meyers, D AU - Cash, L AU - Guilmette, R AU - Kreyling, W AU - Oberdoerster, G AU - Smith, R AU - Boecker, B AD - National Institute for Occupational Safety and Health, Lawrence Livermore National Laboratory, Los Alamos National Laboratory, Lovelace Respiratory Research Institute, UK Y1 - 2013/07// PY - 2013 DA - Jul 2013 SP - 1 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 105 IS - 1 SN - 0017-9078, 0017-9078 KW - Pollution Abstracts; Health & Safety Science Abstracts KW - USA KW - Aerosols KW - Pollutant deposition KW - Safety engineering KW - Particulates KW - Radioactivity KW - Councils KW - Nanotechnology KW - Respiratory tract KW - Pollution control KW - P 0000:AIR POLLUTION KW - H 1000:Occupational Safety and Health UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1412552105?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=RADIATION+SAFETY+ASPECTS+OF+NANOTECHNOLOGY%3A+UPDATE+ON+DEVELOPMENT+OF+AN+NCRP+COMMENTARY&rft.au=Hoover%2C+M%3BMeyers%2C+D%3BCash%2C+L%3BGuilmette%2C+R%3BKreyling%2C+W%3BOberdoerster%2C+G%3BSmith%2C+R%3BBoecker%2C+B&rft.aulast=Hoover&rft.aufirst=M&rft.date=2013-07-01&rft.volume=105&rft.issue=1&rft.spage=S15&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-07-01 N1 - Last updated - 2013-08-12 N1 - SubjectsTermNotLitGenreText - Pollutant deposition; Aerosols; Safety engineering; Radioactivity; Particulates; Councils; Pollution control; Respiratory tract; Nanotechnology; USA ER - TY - JOUR T1 - Expert assessment of vulnerability of permafrost carbon to climate change AN - 1400630278; 676985-12 AB - Approximately 1700 Pg of soil carbon (C) are stored in the northern circumpolar permafrost zone, more than twice as much C than in the atmosphere. The overall amount, rate, and form of C released to the atmosphere in a warmer world will influence the strength of the permafrost C feedback to climate change. We used a survey to quantify variability in the perception of the vulnerability of permafrost C to climate change. Experts were asked to provide quantitative estimates of permafrost change in response to four scenarios of warming. For the highest warming scenario (RCP 8.5), experts hypothesized that C release from permafrost zone soils could be 19-45 Pg C by 2040, 162-288 Pg C by 2100, and 381-616 Pg C by 2300 in CO (sub 2) equivalent using 100-year CH (sub 4) global warming potential (GWP). These values become 50 % larger using 20-year CH (sub 4) GWP, with a third to a half of expected climate forcing coming from CH (sub 4) even though CH (sub 4) was only 2.3 % of the expected C release. Experts projected that two-thirds of this release could be avoided under the lowest warming scenario (RCP 2.6). These results highlight the potential risk from permafrost thaw and serve to frame a hypothesis about the magnitude of this feedback to climate change. However, the level of emissions proposed here are unlikely to overshadow the impact of fossil fuel burning, which will continue to be the main source of C emissions and climate forcing. Copyright 2013 Springer Science+Business Media Dordrecht and The Author(s) JF - Climatic Change AU - Schuur, E A G AU - Abbott, B W AU - Bowden, W B AU - Brovkin, V AU - Camill, P AU - Canadell, J G AU - Chanton, J P AU - Chapin, F S, III AU - Christensen, T R AU - Ciais, P AU - Crosby, B T AU - Czimczik, C I AU - Grosse, G AU - Harden, J AU - Hayes, D J AU - Hugelius, G AU - Jastrow, J D AU - Jones, J B AU - Kleinen, T AU - Koven, C D AU - Krinner, G AU - Kuhry, P AU - Lawrence, D M AU - McGuire, A D AU - Natali, S M AU - O'Donnell, J A AU - Ping, C L AU - Riley, W J AU - Rinke, A AU - Romanovsky, V E AU - Sannel, A B K AU - Schadel, C AU - Schaefer, K AU - Sky, J AU - Subin, Z M AU - Tarnocai, C AU - Turetsky, M R AU - Waldrop, M P AU - Walter Anthony, K M AU - Wickland, K P AU - Wilson, C J AU - Zimov, S A Y1 - 2013/07// PY - 2013 DA - July 2013 SP - 359 EP - 374 PB - Springer, Dordrecht VL - 119 IS - 2 SN - 0165-0009, 0165-0009 KW - soils KW - experts KW - permafrost KW - prediction KW - atmosphere KW - global change KW - carbon release KW - climate change KW - carbon dioxide KW - feedback KW - future KW - carbon KW - natural hazards KW - risk assessment KW - climate KW - global warming KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400630278?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Climatic+Change&rft.atitle=Expert+assessment+of+vulnerability+of+permafrost+carbon+to+climate+change&rft.au=Schuur%2C+E+A+G%3BAbbott%2C+B+W%3BBowden%2C+W+B%3BBrovkin%2C+V%3BCamill%2C+P%3BCanadell%2C+J+G%3BChanton%2C+J+P%3BChapin%2C+F+S%2C+III%3BChristensen%2C+T+R%3BCiais%2C+P%3BCrosby%2C+B+T%3BCzimczik%2C+C+I%3BGrosse%2C+G%3BHarden%2C+J%3BHayes%2C+D+J%3BHugelius%2C+G%3BJastrow%2C+J+D%3BJones%2C+J+B%3BKleinen%2C+T%3BKoven%2C+C+D%3BKrinner%2C+G%3BKuhry%2C+P%3BLawrence%2C+D+M%3BMcGuire%2C+A+D%3BNatali%2C+S+M%3BO%27Donnell%2C+J+A%3BPing%2C+C+L%3BRiley%2C+W+J%3BRinke%2C+A%3BRomanovsky%2C+V+E%3BSannel%2C+A+B+K%3BSchadel%2C+C%3BSchaefer%2C+K%3BSky%2C+J%3BSubin%2C+Z+M%3BTarnocai%2C+C%3BTuretsky%2C+M+R%3BWaldrop%2C+M+P%3BWalter+Anthony%2C+K+M%3BWickland%2C+K+P%3BWilson%2C+C+J%3BZimov%2C+S+A&rft.aulast=Schuur&rft.aufirst=E+A&rft.date=2013-07-01&rft.volume=119&rft.issue=2&rft.spage=359&rft.isbn=&rft.btitle=&rft.title=Climatic+Change&rft.issn=01650009&rft_id=info:doi/10.1007%2Fs10584-013-0730-7 L2 - http://www.springerlink.com/(hc4pmh453vbxpeaygjkevi45)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:100247,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Number of references - 46 N1 - Document feature - illus. N1 - Last updated - 2017-01-24 N1 - CODEN - CLCHDX N1 - SubjectsTermNotLitGenreText - atmosphere; carbon; carbon dioxide; carbon release; climate; climate change; experts; feedback; future; global change; global warming; natural hazards; permafrost; prediction; risk assessment; soils DO - http://dx.doi.org/10.1007/s10584-013-0730-7 ER - TY - JOUR T1 - Deuterium burning in massive giant planets and low-mass brown dwarfs formed by core-nucleated accretion AN - 1618131662; 2014-086170 AB - Using detailed numerical simulations, we study the formation of bodies near the deuterium-burning limit according to the core-nucleated giant planet accretion scenario. The objects, with heavy-element cores in the range 5-30 M (sub Earth symbol) , are assumed to accrete gas up to final masses of 10-15 Jupiter masses (M (sub Jup) ). After the formation process, which lasts 1-5 Myr and which ends with a "cold-start," low-entropy configuration, the bodies evolve at constant mass up to an age of several Gyr. Deuterium burning via proton capture is included in the calculation, and we determined the mass, M (sub 50) , above which more than 50% of the initial deuterium is burned. This often-quoted borderline between giant planets and brown dwarfs is found to depend only slightly on parameters, such as core mass, stellar mass, formation location, solid surface density in the protoplanetary disk, disk viscosity, and dust opacity. The values for M (sub 50) fall in the range 11.6-13.6 M (sub Jup) , in agreement with previous determinations that do not take the formation process into account. For a given opacity law during the formation process, objects with higher core masses form more quickly. The result is higher entropy in the envelope at the completion of accretion, yielding lower values of M (sub 50) . For masses above M (sub 50) , during the deuterium-burning phase, objects expand and increase in luminosity by one to three orders of magnitude. Evolutionary tracks in the luminosity versus time diagram are compared with the observed position of the companion to Beta Pictoris. Copyright (Copyright) 2013. The American Astronomical Society. All rights reserved. JF - The Astrophysical Journal AU - Bodenheimer, Peter AU - D'Angelo, Gennaro AU - Lissauer, Jack J AU - Fortney, Jonathan J AU - Saumon, Didier Y1 - 2013/06/20/ PY - 2013 DA - 2013 Jun 20 EP - Paper No. 120 PB - IOP Publishing for American Astronomical Society, Bristol VL - 770 IS - 2 SN - 0004-637X, 0004-637X KW - accretion KW - numerical models KW - gaseous phase KW - isotopes KW - protoplanetary disk KW - stable isotopes KW - giant planets KW - mass KW - planets KW - deuterium-burning phase KW - brown dwarfs KW - viscosity KW - stars KW - hydrogen KW - opacity KW - core KW - deuterium KW - luminosity KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618131662?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Astrophysical+Journal&rft.atitle=Deuterium+burning+in+massive+giant+planets+and+low-mass+brown+dwarfs+formed+by+core-nucleated+accretion&rft.au=Bodenheimer%2C+Peter%3BD%27Angelo%2C+Gennaro%3BLissauer%2C+Jack+J%3BFortney%2C+Jonathan+J%3BSaumon%2C+Didier&rft.aulast=Bodenheimer&rft.aufirst=Peter&rft.date=2013-06-20&rft.volume=770&rft.issue=2&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F770%2F2%2F120 L2 - http://iopscience.iop.org/0004-637X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 54 N1 - Document feature - illus. incl. 5 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2014-10-30 N1 - SubjectsTermNotLitGenreText - accretion; brown dwarfs; core; deuterium; deuterium-burning phase; gaseous phase; giant planets; hydrogen; isotopes; luminosity; mass; numerical models; opacity; planets; protoplanetary disk; stable isotopes; stars; viscosity DO - http://dx.doi.org/10.1088/0004-637X/770/2/120 ER - TY - JOUR T1 - Evidence for deposition of 10 million tonnes of impact spherules across four continents 12,800 y ago AN - 1722154557; 2015-097323 AB - Airbursts/impacts by a fragmented comet or asteroid have been proposed at the Younger Dryas onset (12.80+ or -0.15 ka) based on identification of an assemblage of impact-related proxies, including microspherules, nanodiamonds, and iridium. Distributed across four continents at the Younger Dryas boundary (YDB), spherule peaks have been independently confirmed in eight studies, but unconfirmed in two others, resulting in continued dispute about their occurrence, distribution, and origin. To further address this dispute and better identify YDB spherules, we present results from one of the largest spherule investigations ever undertaken regarding spherule geochemistry, morphologies, origins, and processes of formation. We investigated 18 sites across North America, Europe, and the Middle East, performing nearly 700 analyses on spherules using energy dispersive X-ray spectroscopy for geochemical analyses and scanning electron microscopy for surface microstructural characterization. Twelve locations rank among the world's premier end-Pleistocene archaeological sites, where the YDB marks a hiatus in human occupation or major changes in site use. Our results are consistent with melting of sediments to temperatures >2,200 degrees C by the thermal radiation and air shocks produced by passage of an extraterrestrial object through the atmosphere; they are inconsistent with volcanic, cosmic, anthropogenic, lightning, or authigenic sources. We also produced spherules from wood in the laboratory at >1,730 degrees C, indicating that impact-related incineration of biomass may have contributed to spherule production. At 12.8 ka, an estimated 10 million tonnes of spherules were distributed across approximately 50 million square kilometers, similar to well-known impact strewnfields and consistent with a major cosmic impact event. JF - Proceedings of the National Academy of Sciences of the United States of America AU - Wittke, James H AU - Weaver, James C AU - Bunch, Ted E AU - Kennett, James P AU - Kennett, Douglas J AU - Moore, Andrew M T AU - Hillman, Gordon C AU - Tankersley, Kenneth B AU - Goodyear, Albert C AU - Moore, Christopher R AU - Daniel, I Randolph, Jr AU - Ray, Jack H AU - Lopinot, Neal H AU - Ferraro, David AU - Israde-Alcantara, Isabel AU - Bischoff, James L AU - DeCarli, Paul S AU - Hermes, Robert E AU - Kloosterman, Johan B AU - Revay, Zsolt AU - Howard, George A AU - Kimbel, David R AU - Kletetschka, Gunther AU - Nabelek, Ladislav AU - Lipo, Carl P AU - Sakai, Sachiko AU - West, Allen AU - Firestone, Richard B Y1 - 2013/06/04/ PY - 2013 DA - 2013 Jun 04 SP - E2088 EP - E0297 PB - National Academy of Sciences, Washington, DC VL - 110 IS - 23 SN - 0027-8424, 0027-8424 KW - silicates KW - microstructure KW - Europe KW - platinum group KW - Alberta KW - iridium KW - temperature KW - magnetic properties KW - fires KW - Theria KW - Weichselian KW - framework silicates KW - Younger Dryas KW - Eutheria KW - Asia KW - Middle East KW - strewn fields KW - North America KW - Chordata KW - archaeology KW - Quaternary KW - Mammalia KW - paleomagnetism KW - electron microscopy data KW - impacts KW - Primates KW - X-ray spectra KW - EDS spectra KW - Antarctic ice sheet KW - Homo sapiens sapiens KW - Mexico KW - Canada KW - archaeological sites KW - Pleistocene KW - Tetrapoda KW - SEM data KW - high temperature KW - United States KW - silica minerals KW - biomass KW - Syria KW - Homo KW - upper Pleistocene KW - Cenozoic KW - upper Weichselian KW - melting KW - Homo sapiens KW - optically stimulated luminescence KW - Clovis KW - diamond KW - Folsom KW - spectra KW - spherules KW - rates KW - native elements KW - Hominidae KW - genesis KW - air shocks KW - air bursts KW - Antarctica KW - lechatelierite KW - metals KW - Western Canada KW - stratigraphic boundary KW - Vertebrata KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1722154557?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.atitle=Evidence+for+deposition+of+10+million+tonnes+of+impact+spherules+across+four+continents+12%2C800+y+ago&rft.au=Wittke%2C+James+H%3BWeaver%2C+James+C%3BBunch%2C+Ted+E%3BKennett%2C+James+P%3BKennett%2C+Douglas+J%3BMoore%2C+Andrew+M+T%3BHillman%2C+Gordon+C%3BTankersley%2C+Kenneth+B%3BGoodyear%2C+Albert+C%3BMoore%2C+Christopher+R%3BDaniel%2C+I+Randolph%2C+Jr%3BRay%2C+Jack+H%3BLopinot%2C+Neal+H%3BFerraro%2C+David%3BIsrade-Alcantara%2C+Isabel%3BBischoff%2C+James+L%3BDeCarli%2C+Paul+S%3BHermes%2C+Robert+E%3BKloosterman%2C+Johan+B%3BRevay%2C+Zsolt%3BHoward%2C+George+A%3BKimbel%2C+David+R%3BKletetschka%2C+Gunther%3BNabelek%2C+Ladislav%3BLipo%2C+Carl+P%3BSakai%2C+Sachiko%3BWest%2C+Allen%3BFirestone%2C+Richard+B&rft.aulast=Wittke&rft.aufirst=James&rft.date=2013-06-04&rft.volume=110&rft.issue=23&rft.spage=E2088&rft.isbn=&rft.btitle=&rft.title=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.issn=00278424&rft_id=info:doi/10.1073%2Fpnas.1301760110 L2 - http://www.pnas.org/content/by/year LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. N1 - Date revised - 2015-01-01 N1 - Number of references - 65 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table, sketch map N1 - Last updated - 2015-10-15 N1 - CODEN - PNASA6 N1 - SubjectsTermNotLitGenreText - air bursts; air shocks; Alberta; Antarctic ice sheet; Antarctica; archaeological sites; archaeology; Asia; biomass; Canada; Cenozoic; Chordata; Clovis; diamond; EDS spectra; electron microscopy data; Europe; Eutheria; fires; Folsom; framework silicates; genesis; high temperature; Hominidae; Homo; Homo sapiens; Homo sapiens sapiens; impacts; iridium; lechatelierite; magnetic properties; Mammalia; melting; metals; Mexico; microstructure; Middle East; native elements; North America; optically stimulated luminescence; paleomagnetism; platinum group; Pleistocene; Primates; Quaternary; rates; SEM data; silica minerals; silicates; spectra; spherules; stratigraphic boundary; strewn fields; Syria; temperature; Tetrapoda; Theria; United States; upper Pleistocene; upper Weichselian; Vertebrata; Weichselian; Western Canada; X-ray spectra; Younger Dryas DO - http://dx.doi.org/10.1073/pnas.1301760110 ER - TY - CPAPER T1 - Broad-band acoustic low frequency collimated beam for ultrasonic imaging T2 - 2013 Joint meeting of the 21st International Congress on Acoustics, 165th Meeting of the Acoustical Society of America and 52nd Meeting of the Canadian Acoustical Association AN - 1412152980; 6227333 JF - 2013 Joint meeting of the 21st International Congress on Acoustics, 165th Meeting of the Acoustical Society of America and 52nd Meeting of the Canadian Acoustical Association AU - Pantea, Cristian AU - Sinha, Dipen Y1 - 2013/06/02/ PY - 2013 DA - 2013 Jun 02 KW - Acoustics KW - Ultrasonics KW - Imaging techniques UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1412152980?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Joint+meeting+of+the+21st+International+Congress+on+Acoustics%2C+165th+Meeting+of+the+Acoustical+Society+of+America+and+52nd+Meeting+of+the+Canadian+Acoustical+Association&rft.atitle=Broad-band+acoustic+low+frequency+collimated+beam+for+ultrasonic+imaging&rft.au=Pantea%2C+Cristian%3BSinha%2C+Dipen&rft.aulast=Pantea&rft.aufirst=Cristian&rft.date=2013-06-02&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Joint+meeting+of+the+21st+International+Congress+on+Acoustics%2C+165th+Meeting+of+the+Acoustical+Society+of+America+and+52nd+Meeting+of+the+Canadian+Acoustical+Association&rft.issn=&rft_id=info:doi/ L2 - http://acousticalsociety.org/sites/default/files/docs/full_week.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-06-30 N1 - Last updated - 2013-07-25 ER - TY - CPAPER T1 - Broadband directional ultrasound propagation using sonic crystal and nonlinear medium T2 - 2013 Joint meeting of the 21st International Congress on Acoustics, 165th Meeting of the Acoustical Society of America and 52nd Meeting of the Canadian Acoustical Association AN - 1412143387; 6227426 JF - 2013 Joint meeting of the 21st International Congress on Acoustics, 165th Meeting of the Acoustical Society of America and 52nd Meeting of the Canadian Acoustical Association AU - Sinha, Dipen AU - Pantea, Cristian Y1 - 2013/06/02/ PY - 2013 DA - 2013 Jun 02 KW - Crystals KW - Ultrasound UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1412143387?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Joint+meeting+of+the+21st+International+Congress+on+Acoustics%2C+165th+Meeting+of+the+Acoustical+Society+of+America+and+52nd+Meeting+of+the+Canadian+Acoustical+Association&rft.atitle=Broadband+directional+ultrasound+propagation+using+sonic+crystal+and+nonlinear+medium&rft.au=Sinha%2C+Dipen%3BPantea%2C+Cristian&rft.aulast=Sinha&rft.aufirst=Dipen&rft.date=2013-06-02&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Joint+meeting+of+the+21st+International+Congress+on+Acoustics%2C+165th+Meeting+of+the+Acoustical+Society+of+America+and+52nd+Meeting+of+the+Canadian+Acoustical+Association&rft.issn=&rft_id=info:doi/ L2 - http://acousticalsociety.org/sites/default/files/docs/full_week.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-06-30 N1 - Last updated - 2013-07-25 ER - TY - JOUR T1 - Modeling aeolian transport of soil-bound plutonium; considering infrequent but normal environmental disturbances is critical in estimating future dose AN - 1824216301; 2016-084160 AB - Dose assessments typically consider environmental systems as static through time, but environmental disturbances such as drought and fire are normal, albeit infrequent, events that can impact dose-influential attributes of many environmental systems. These phenomena occur over time frames of decades or longer, and are likely to be exacerbated under projected warmer, drier climate. As with other types of dose assessment, the impacts of environmental disturbances are often overlooked when evaluating dose from aeolian transport of radionuclides and other contaminants. Especially lacking are predictions that account for potential changing vegetation cover effects on radionuclide transport over the long time frames required by regulations. A recently developed dynamic wind-transport model that included vegetation succession and environmental disturbance provides more realistic long-term predictability. This study utilized the model to estimate emission rates for aeolian transport, and compare atmospheric dispersion and deposition rates of airborne plutonium-contaminated soil into neighboring areas with and without environmental disturbances. Specifically, the objective of this study was to utilize the model results as input for a widely used dose assessment model (CAP-88). Our case study focused on low levels of residual plutonium found in soils from past operations at Los Alamos National Laboratory (LANL), in Los Alamos, NM, located in the semiarid southwestern USA. Calculations were conducted for different disturbance scenarios based on conditions associated with current climate, and a potential future drier and warmer climate. Known soil and sediment concentrations of plutonium were used to model dispersal and deposition of windblown residual plutonium, as a function of distance and direction. Environmental disturbances that affected vegetation cover included ground fire, crown fire, and drought, with reoccurrence rates for current climate based on site historical patterns. Using site-specific meteorology, accumulation rates of plutonium in soil were modeled in a variety of directions and distances from LANL sources. Model results suggest that without disturbances, areas downwind to the contaminated watershed would accumulate LANL-derived plutonium at a relatively slow rate (<0.01 Bq m (super -2) yr (super -1) ). However, model results under more realistic assumptions that include environmental disturbances show accumulation rates more than an order-of-magnitude faster. More generally, this assessment highlights the broader need in radioecology and environmental health physics to consider infrequent but normal environmental disturbances in longer-term dose assessments. Abstract Copyright (2013) Elsevier, B.V. JF - Journal of Environmental Radioactivity AU - Michelotti, Erika A AU - Whicker, Jeffrey J AU - Eisele, William F AU - Breshears, David D AU - Kirchner, Thomas B Y1 - 2013/06// PY - 2013 DA - June 2013 SP - 73 EP - 80 PB - Elsevier, Oxford VL - 120 SN - 0265-931X, 0265-931X KW - United States KW - Pu-240/Pu-239 KW - geologic hazards KW - isotopes KW - radioactivity KW - plutonium KW - ecosystems KW - New Mexico KW - Los Alamos County New Mexico KW - vegetation KW - simulation KW - environmental effects KW - environmental management KW - radioactive isotopes KW - transport KW - sedimentation rates KW - climate KW - sediment transport KW - pollutants KW - isotope ratios KW - statistical analysis KW - sedimentation KW - prediction KW - pollution KW - Los Alamos National Laboratory KW - models KW - soil pollution KW - metals KW - natural hazards KW - risk assessment KW - mobilization KW - wind transport KW - actinides KW - 02C:Geochemistry of rocks, soils, and sediments KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1824216301?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Environmental+Radioactivity&rft.atitle=Modeling+aeolian+transport+of+soil-bound+plutonium%3B+considering+infrequent+but+normal+environmental+disturbances+is+critical+in+estimating+future+dose&rft.au=Michelotti%2C+Erika+A%3BWhicker%2C+Jeffrey+J%3BEisele%2C+William+F%3BBreshears%2C+David+D%3BKirchner%2C+Thomas+B&rft.aulast=Michelotti&rft.aufirst=Erika&rft.date=2013-06-01&rft.volume=120&rft.issue=&rft.spage=73&rft.isbn=&rft.btitle=&rft.title=Journal+of+Environmental+Radioactivity&rft.issn=0265931X&rft_id=info:doi/10.1016%2Fj.jenvrad.2013.01.011 L2 - http://www.sciencedirect.com/science/journal/0265931X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2016-01-01 N1 - Number of references - 53 N1 - Document feature - illus. N1 - Last updated - 2016-09-29 N1 - SubjectsTermNotLitGenreText - actinides; climate; ecosystems; environmental effects; environmental management; geologic hazards; isotope ratios; isotopes; Los Alamos County New Mexico; Los Alamos National Laboratory; metals; mobilization; models; natural hazards; New Mexico; plutonium; pollutants; pollution; prediction; Pu-240/Pu-239; radioactive isotopes; radioactivity; risk assessment; sediment transport; sedimentation; sedimentation rates; simulation; soil pollution; statistical analysis; transport; United States; vegetation; wind transport DO - http://dx.doi.org/10.1016/j.jenvrad.2013.01.011 ER - TY - JOUR T1 - Assessing leakage detectability at geologic CO (sub 2) sequestration sites using the probabilistic collocation method AN - 1700096149; 2015-072102 AB - We present an efficient methodology for assessing leakage detectability at geologic carbon sequestration sites under parameter uncertainty. Uncertainty quantification (UQ) and risk assessment are integral and, in many countries, mandatory components of geologic carbon sequestration projects. A primary goal of risk assessment is to evaluate leakage potential from anthropogenic and natural features, which constitute one of the greatest threats to the integrity of carbon sequestration repositories. The backbone of our detectability assessment framework is the probability collocation method (PCM), an efficient, nonintrusive, uncertainty-quantification technique that can enable large-scale stochastic simulations that are based on results from only a small number of forward-model runs. The metric for detectability is expressed through an extended signal-to-noise ratio (SNR), which incorporates epistemic uncertainty associated with both reservoir and aquifer parameters. The spatially heterogeneous aquifer hydraulic conductivity is parameterized using Karhunen-Loeve (KL) expansion. Our methodology is demonstrated numerically for generating probability maps of pressure anomalies and for calculating SNRs. Results indicate that the likelihood of detecting anomalies depends on the level of uncertainty and location of monitoring wells. A monitoring well located close to leaky locations may not always yield the strongest signal of leakage when the level of uncertainty is high. Therefore, our results highlight the need for closed-loop site characterization, monitoring network design, and leakage source detection. Abstract Copyright (2013) Elsevier, B.V. JF - Advances in Water Resources AU - Sun, Alexander Y AU - Zeidouni, Mehdi AU - Nicot, Jean-Philippe AU - Lu, Zhiming AU - Zhang, Dongxiao Y1 - 2013/06// PY - 2013 DA - June 2013 SP - 49 EP - 60 PB - Elsevier, Oxford VL - 56 SN - 0309-1708, 0309-1708 KW - methods KW - carbon sequestration KW - pressure KW - numerical models KW - site exploration KW - statistical analysis KW - gas storage KW - simulation KW - seepage KW - detection KW - signal-to-noise ratio KW - risk assessment KW - probability KW - uncertainty KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1700096149?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Advances+in+Water+Resources&rft.atitle=Assessing+leakage+detectability+at+geologic+CO+%28sub+2%29+sequestration+sites+using+the+probabilistic+collocation+method&rft.au=Sun%2C+Alexander+Y%3BZeidouni%2C+Mehdi%3BNicot%2C+Jean-Philippe%3BLu%2C+Zhiming%3BZhang%2C+Dongxiao&rft.aulast=Sun&rft.aufirst=Alexander&rft.date=2013-06-01&rft.volume=56&rft.issue=&rft.spage=49&rft.isbn=&rft.btitle=&rft.title=Advances+in+Water+Resources&rft.issn=03091708&rft_id=info:doi/10.1016%2Fj.advwatres.2012.11.017 L2 - http://www.sciencedirect.com/science/journal/03091708 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2015-01-01 N1 - Number of references - 67 N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2015-07-30 N1 - SubjectsTermNotLitGenreText - carbon sequestration; detection; gas storage; methods; numerical models; pressure; probability; risk assessment; seepage; signal-to-noise ratio; simulation; site exploration; statistical analysis; uncertainty DO - http://dx.doi.org/10.1016/j.advwatres.2012.11.017 ER - TY - JOUR T1 - Preliminary Covariance Data Representation for the "A Compact ENDF" File AN - 1671542092; 18278220 AB - In typical applications in criticality, the most important contributor to the uncertainty of the effective multiplication factor k is from the uncertainties in the nuclear data or cross sections. Over the last few decades, there has been increasing efforts by the nuclear data evaluators to provide covariance data for libraries such as ENDF. Data processing codes such as NJOY have been able to process various ENDF covariance formats for almost as long. Sensitivity coefficient capabilities, which are necessary for uncertainty propagation, have also been developed in various Monte Carlo code packages such as SCALE or MCNP. JF - Transactions of the American Nuclear Society AU - Kiedrowski Brian, C AU - Kahler Albert, C AU - Kent Parsons, D AD - Los Alamos National Laboratory, P O Box 1663 MSA143, Los Alamos, NM 87545 bckiedro@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 502 EP - 505 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Uncertainty KW - Multiplication KW - Packages KW - Data processing KW - Monte Carlo methods KW - Representations KW - Covariance KW - Cross sections UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671542092?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Preliminary+Covariance+Data+Representation+for+the+%22A+Compact+ENDF%22+File&rft.au=Kiedrowski+Brian%2C+C%3BKahler+Albert%2C+C%3BKent+Parsons%2C+D&rft.aulast=Kiedrowski+Brian&rft.aufirst=C&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=502&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 7 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - CRITICALITY AND DYNAMIC BENCHMARKING OF THE DUFF REACTOR TEST AN - 1642326867; 18278265 AB - The Demonstration Using Flattop Fissions (DUFF) experiment utilized a heat pipe to transfer power from a small fast reactor (Flattop) to a pair of Stirling converters. The purpose of the test was to demonstrate the feasibility and simplicity of a small fission power system for use in solar system exploration. Another important goal was to show that it was still possible to perform affordable reactor testing within existing facilities. One of the tangential benefits, which is very large in its own right, is that DUFF produced some very useful and unique experimental data. The data allowed for criticality benchmark of both Flattop and DUFF, in a far more detailed manner than the Flattop benchmark included in the International Criticality Safety Benchmark Evaluation Project. More importantly, the test provided first-of-a-kind dynamic data for a small, simple reactor power system. Prior to DUFF, there was no data to benchmark small, fast reactor power system modeling codes, except for data from non-nuclear testing. For this type of reactor system, electrically-heated testing can indeed provide very high confidence in system performance, but a test like DUFF can used to benchmark the reactor kinetics and fill any holes that could possibly exist between nuclear and non-nuclear system testing. In this paper, the experimental data is compared to criticality calculations from MCNP (using ENDF/B-7 nuclear data) and transient calculations from FRINK. The experimental data and computational results agree extremely well. JF - Transactions of the American Nuclear Society AU - Poston David, I AD - Los Alamos National Laboratory, MS C921, Los Alamos, New Mexico 87545 poston@lanl.gov Y1 - 2013/06// PY - 2013 DA - June 2013 SP - 697 EP - 700 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear power generation KW - Nuclear reactors KW - Mathematical models KW - Dynamical systems KW - Nuclear reactor components KW - Benchmarking KW - Dynamics KW - Nuclear engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1642326867?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=CRITICALITY+AND+DYNAMIC+BENCHMARKING+OF+THE+DUFF+REACTOR+TEST&rft.au=Poston+David%2C+I&rft.aulast=Poston+David&rft.aufirst=I&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=697&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 8 N1 - Last updated - 2016-08-08 ER - TY - JOUR T1 - EXPERIMENTAL DEMONSTRATION OF A HEAT PIPE/STIRLING ENGINE NUCLEAR REACTOR AN - 1642326255; 18278086 AB - LANL and NASA have designed several nuclear fission reactors for space applications that are based on the physics of a fast reactor with heat pipes to transfer heat from the nuclear fuel to Stirling engines as a means of power conversion. Heat pipe/Stirling engine reactors have been proposed because of their inherent simplicity. There are no moving parts except for those in the Stirling engine. The reactor is nearly solid state. The simplicity of die reactor concept argues for a reliable, safe, easy to operate and easy to manufacture reactor. One of the key features of these types of reactors is the reactivity feedback mechanism that allows for the reactor to be load following. Thermal feedback lowers reactor power if less heat is extracted by the power conversion. This makes the system more tolerant of power conversion failures. This phenomenon can be modeled, but a nuclear demonstration was needed to validate the modeling. In addition, a heat pipe cooled reactor has never been tested. The test would demonstrate the practicality of a heat piped cooled reactor. The test was named DUFF "Demonstration Using Flattop Fissions." JF - Transactions of the American Nuclear Society AU - Mcclure Patrick, R AU - Poston David, E AU - Dixon David, D AU - Gibson Marc, A AD - Los Alamos National Laboratory, MS C921, Los Alamos, New Mexico 87545 pmcclure@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 19 EP - 22 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear fission KW - Nuclear power generation KW - Nuclear reactors KW - Energy conversion KW - Nuclear reactor components KW - Stirling engines KW - Nuclear engineering KW - Heat pipes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1642326255?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=EXPERIMENTAL+DEMONSTRATION+OF+A+HEAT+PIPE%2FSTIRLING+ENGINE+NUCLEAR+REACTOR&rft.au=Mcclure+Patrick%2C+R%3BPoston+David%2C+E%3BDixon+David%2C+D%3BGibson+Marc%2C+A&rft.aulast=Mcclure+Patrick&rft.aufirst=R&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=19&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 8 N1 - Last updated - 2015-01-06 ER - TY - JOUR T1 - Nd-Mo-borosilicate glass-ceramic: Synthesis, characterization and response to ionizing radiation AN - 1475540790; 18796718 AB - A new borosilicate glass-ceramic with high content of Mo and Nd was synthesized and thoroughly characterized. The structure of the material after it was subjected to 5 MeV He(+) was investigated. 5 MeV He(+) was chosen since it deposits most of the energy as ionizing radiation rather than as nuclear stopping and therefore can be used to simulate self-radiation in advanced nuclear waste-forms. As a result of irradiation, slight Mo reduction occurred together with increased numbers of crystalline precipitates. Those results are interesting for understanding the behavior of systems with high Mo and Nd content such as nuclear waste-forms demonstrating an influence that ionizing radiation can have on the chemistry, environmental stability and microstructure of the waste-forms. JF - Journal of Nuclear Materials AU - Kossoy, A AU - Schulze, R AU - Tang, M AU - Safarik, D J AU - McCabe, R J AD - Los Alamos National Laboratory, NM, USA, anna.kossoy@gmail.com Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 216 EP - 221 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 437 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Ionizing radiation KW - Irradiation KW - Radioactive materials KW - Radioactive wastes KW - Nuclear energy KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1475540790?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Nd-Mo-borosilicate+glass-ceramic%3A+Synthesis%2C+characterization+and+response+to+ionizing+radiation&rft.au=Kossoy%2C+A%3BSchulze%2C+R%3BTang%2C+M%3BSafarik%2C+D+J%3BMcCabe%2C+R+J&rft.aulast=Kossoy&rft.aufirst=A&rft.date=2013-06-01&rft.volume=437&rft.issue=1-3&rft.spage=216&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Number of references - 25 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Irradiation; Ionizing radiation; Radioactive materials; Radioactive wastes; Nuclear energy ER - TY - JOUR T1 - Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project I; Antarctica AN - 1464892701; 2013-093638 AB - Atmospheric, oceanic, and subglacial forcing scenarios from the Sea-level Response to Ice Sheet Evolution (SeaRISE) project are applied to six three-dimensional thermomechanical ice-sheet models to assess Antarctic ice sheet sensitivity over a 500 year timescale and to inform future modeling and field studies. Results indicate (i) growth with warming, except within low-latitude basins (where inland thickening is outpaced by marginal thinning); (ii) mass loss with enhanced sliding (with basins dominated by high driving stresses affected more than basins with low-surface-slope streaming ice); and (iii) mass loss with enhanced ice shelf melting (with changes in West Antarctica dominating the signal due to its marine setting and extensive ice shelves; cf. minimal impact in the Terre Adelie, George V, Oates, and Victoria Land region of East Antarctica). Ice loss due to dynamic changes associated with enhanced sliding and/or sub-shelf melting exceeds the gain due to increased precipitation. Furthermore, differences in results between and within basins as well as the controlling impact of sub-shelf melting on ice dynamics highlight the need for improved understanding of basal conditions, grounding-zone processes, ocean-ice interactions, and the numerical representation of all three. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Journal of Geophysical Research: Earth Surface AU - Nowicki, Sophie AU - Bindschadler, Robert A AU - Abe-Ouchi, Ayako AU - Aschwanden, Andy AU - Bueler, Ed AU - Choi, Hyeungu AU - Fastook, Jim AU - Granzow, Glen AU - Greve, Ralf AU - Gutowski, Gail AU - Herzfeld, Ute AU - Jackson, Charles AU - Johnson, Jesse AU - Khroulev, Constantine AU - Larour, Eric AU - Levermann, Anders AU - Lipscomb, William H AU - Martin, Maria A AU - Morlighem, Mathieu AU - Parizek, Byron R AU - Pollard, David AU - Price, Stephen F AU - Ren, Diandong AU - Rignot, Eric AU - Saito, Fuyuki AU - Sato, Tatsuru AU - Seddik, Hakime AU - Seroussi, Helene AU - Takahashi, Kunio AU - Walker, Ryan AU - Wang, Wei Li Y1 - 2013/06// PY - 2013 DA - June 2013 SP - 1002 EP - 1024 PB - Wiley-Blackwell for American Geophysical Union, Washington, DC VL - 118 IS - 2 SN - 2169-9003, 2169-9003 KW - subglacial processes KW - ice shelves KW - atmospheric precipitation KW - deglaciation KW - climate change KW - temperature KW - spatial variations KW - topography KW - melting KW - sensitivity analysis KW - mass balance KW - ice KW - grounding KW - basins KW - thickness KW - climate forcing KW - elevation KW - prediction KW - glaciers KW - ice dynamics KW - SeaRISE KW - ice sheets KW - models KW - sea-level changes KW - Antarctica KW - glacial geology KW - 24:Quaternary geology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464892701?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research%3A+Earth+Surface&rft.atitle=Insights+into+spatial+sensitivities+of+ice+mass+response+to+environmental+change+from+the+SeaRISE+ice+sheet+modeling+project+I%3B+Antarctica&rft.au=Nowicki%2C+Sophie%3BBindschadler%2C+Robert+A%3BAbe-Ouchi%2C+Ayako%3BAschwanden%2C+Andy%3BBueler%2C+Ed%3BChoi%2C+Hyeungu%3BFastook%2C+Jim%3BGranzow%2C+Glen%3BGreve%2C+Ralf%3BGutowski%2C+Gail%3BHerzfeld%2C+Ute%3BJackson%2C+Charles%3BJohnson%2C+Jesse%3BKhroulev%2C+Constantine%3BLarour%2C+Eric%3BLevermann%2C+Anders%3BLipscomb%2C+William+H%3BMartin%2C+Maria+A%3BMorlighem%2C+Mathieu%3BParizek%2C+Byron+R%3BPollard%2C+David%3BPrice%2C+Stephen+F%3BRen%2C+Diandong%3BRignot%2C+Eric%3BSaito%2C+Fuyuki%3BSato%2C+Tatsuru%3BSeddik%2C+Hakime%3BSeroussi%2C+Helene%3BTakahashi%2C+Kunio%3BWalker%2C+Ryan%3BWang%2C+Wei+Li&rft.aulast=Nowicki&rft.aufirst=Sophie&rft.date=2013-06-01&rft.volume=118&rft.issue=2&rft.spage=1002&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research%3A+Earth+Surface&rft.issn=21699003&rft_id=info:doi/10.1002%2Fjgrf.20081 L2 - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%292169-9011/issues?year=2013 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 119 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables, sketch maps N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-12-05 N1 - SubjectsTermNotLitGenreText - Antarctica; atmospheric precipitation; basins; climate change; climate forcing; deglaciation; elevation; glacial geology; glaciers; grounding; ice; ice dynamics; ice sheets; ice shelves; mass balance; melting; models; prediction; sea-level changes; SeaRISE; sensitivity analysis; spatial variations; subglacial processes; temperature; thickness; topography DO - http://dx.doi.org/10.1002/jgrf.20081 ER - TY - JOUR T1 - Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project II; Greenland AN - 1464892579; 2013-093639 AB - The Sea-level Response to Ice Sheet Evolution (SeaRISE) effort explores the sensitivity of the current generation of ice sheet models to external forcing to gain insight into the potential future contribution to sea level from the Greenland and Antarctic ice sheets. All participating models simulated the ice sheet response to three types of external forcings: a change in oceanic condition, a warmer atmospheric environment, and enhanced basal lubrication. Here an analysis of the spatial response of the Greenland ice sheet is presented, and the impact of model physics and spin-up on the projections is explored. Although the modeled responses are not always homogeneous, consistent spatial trends emerge from the ensemble analysis, indicating distinct vulnerabilities of the Greenland ice sheet. There are clear response patterns associated with each forcing, and a similar mass loss at the full ice sheet scale will result in different mass losses at the regional scale, as well as distinct thickness changes over the ice sheet. All forcings lead to an increased mass loss for the coming centuries, with increased basal lubrication and warmer ocean conditions affecting mainly outlet glaciers, while the impacts of atmospheric forcings affect the whole ice sheet. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Journal of Geophysical Research: Earth Surface AU - Nowicki, Sophie AU - Bindschadler, Robert A AU - Abe-Ouchi, Ayako AU - Aschwanden, Andy AU - Bueler, Ed AU - Choi, Hyeungu AU - Fastook, Jim AU - Granzow, Glen AU - Greve, Ralf AU - Gutowski, Gail AU - Herzfeld, Ute AU - Jackson, Charles AU - Johnson, Jesse AU - Khroulev, Constantine AU - Larour, Eric AU - Levermann, Anders AU - Lipscomb, William H AU - Martin, Maria A AU - Morlighem, Mathieu AU - Parizek, Byron R AU - Pollard, David AU - Price, Stephen F AU - Ren, Diandong AU - Rignot, Eric AU - Saito, Fuyuki AU - Sato, Tatsuru AU - Seddik, Hakime AU - Seroussi, Helene AU - Takahashi, Kunio AU - Walker, Ryan AU - Wang, Wei Li Y1 - 2013/06// PY - 2013 DA - June 2013 SP - 1025 EP - 1044 PB - Wiley-Blackwell for American Geophysical Union, Washington, DC VL - 118 IS - 2 SN - 2169-9003, 2169-9003 KW - subglacial processes KW - ice shelves KW - simulation KW - deglaciation KW - climate change KW - Greenland KW - spatial variations KW - topography KW - melting KW - dynamics KW - sensitivity analysis KW - mass balance KW - ice KW - basins KW - thickness KW - climate forcing KW - Arctic region KW - elevation KW - prediction KW - glaciers KW - SeaRISE KW - ice sheets KW - models KW - ice movement KW - sea-level changes KW - glacial geology KW - sea-surface temperature KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464892579?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research%3A+Earth+Surface&rft.atitle=Insights+into+spatial+sensitivities+of+ice+mass+response+to+environmental+change+from+the+SeaRISE+ice+sheet+modeling+project+II%3B+Greenland&rft.au=Nowicki%2C+Sophie%3BBindschadler%2C+Robert+A%3BAbe-Ouchi%2C+Ayako%3BAschwanden%2C+Andy%3BBueler%2C+Ed%3BChoi%2C+Hyeungu%3BFastook%2C+Jim%3BGranzow%2C+Glen%3BGreve%2C+Ralf%3BGutowski%2C+Gail%3BHerzfeld%2C+Ute%3BJackson%2C+Charles%3BJohnson%2C+Jesse%3BKhroulev%2C+Constantine%3BLarour%2C+Eric%3BLevermann%2C+Anders%3BLipscomb%2C+William+H%3BMartin%2C+Maria+A%3BMorlighem%2C+Mathieu%3BParizek%2C+Byron+R%3BPollard%2C+David%3BPrice%2C+Stephen+F%3BRen%2C+Diandong%3BRignot%2C+Eric%3BSaito%2C+Fuyuki%3BSato%2C+Tatsuru%3BSeddik%2C+Hakime%3BSeroussi%2C+Helene%3BTakahashi%2C+Kunio%3BWalker%2C+Ryan%3BWang%2C+Wei+Li&rft.aulast=Nowicki&rft.aufirst=Sophie&rft.date=2013-06-01&rft.volume=118&rft.issue=2&rft.spage=1025&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research%3A+Earth+Surface&rft.issn=21699003&rft_id=info:doi/10.1002%2Fjgrf.20076 L2 - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%292169-9011/issues?year=2013 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 84 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables, sketch maps N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-12-05 N1 - SubjectsTermNotLitGenreText - Arctic region; basins; climate change; climate forcing; deglaciation; dynamics; elevation; glacial geology; glaciers; Greenland; ice; ice movement; ice sheets; ice shelves; mass balance; melting; models; prediction; sea-level changes; sea-surface temperature; SeaRISE; sensitivity analysis; simulation; spatial variations; subglacial processes; thickness; topography DO - http://dx.doi.org/10.1002/jgrf.20076 ER - TY - JOUR T1 - Efficient Passive Gamma Detector Modeling of Spent Fuel with MCNP AN - 1429883207; 18278260 AB - The Next Generation Safeguards Initiative (NGSI) of the U.S. Department of Energy (DOE) has funded a multi-laboratory/university development of new technologies to quantify the plutonium (Pu) mass in, and to detect the diversion of pins from, spent nuclear fuel assemblies. A Passive prompt spectral-resolved Gamma (PG) instrument was one of the proposed methods to quantify burnup, cooling time, and initial enrichment of spent fuel assemblies. Monte Carlo modeling with the MCNP6 Monte Carlo radiation transport code was performed indicating that the PG instrument should be pursued. The first calculations used a 1st generation spent fuel assembly model, spent fuel library #1 (SFL1), and approximated the signal at the detector with the signal at the pipe base. We have repeated the calculation with a more sophisticated model of the submerged fuel assembly and HPGe detector with a 2nd generation spent fuel assembly model to create SFL2. Both the earlier simplifying approximation (signal at the pipe base) and full modeling of photon transport to the detector have been performed to assess whether the full transport to the detector is required or if other simplifying approximations are adequate to achieve similar results with greater computational efficiency. In addition, several different Variance Reduction Techniques were examined to make the calculation more efficient. JF - Transactions of the American Nuclear Society AU - Fischer Noah, A AU - Hendricks John, S AU - Galloway Jack, D AU - Trellue Holly, R AU - Fensin Michael, L AD - Los Alamos National Laboratory; Los Alamos, NM87545 noahf@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 677 EP - 679 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Plutonium KW - Mathematical models KW - Computer simulation KW - Monte Carlo methods KW - Detectors KW - Assemblies KW - Approximation KW - Spent fuels UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429883207?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Efficient+Passive+Gamma+Detector+Modeling+of+Spent+Fuel+with+MCNP&rft.au=Fischer+Noah%2C+A%3BHendricks+John%2C+S%3BGalloway+Jack%2C+D%3BTrellue+Holly%2C+R%3BFensin+Michael%2C+L&rft.aulast=Fischer+Noah&rft.aufirst=A&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=677&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 5 N1 - Last updated - 2014-04-08 ER - TY - JOUR T1 - Experiments Supporting the Development of Mo-99 Production Technologies without HEU AN - 1429883054; 18278085 AB - Los Alamos National Laboratory (LANL) is working with other national laboratories and industry partners on technology pathways for "Mo production without the use of highly enriched uranium (HEU). The work is part of the National Nuclear Security Administration's (NNSA) Global Threat Reduction Initiative (GTRI) program to accelerate the establishment of a reliable domestic supply of "Mo for nuclear medicine. (99m)Tc, the metastable daughter product of "Mo, is the most commonly used radioisotope in nuclear medicine. The "Mo supply for the United Stated has largely come from aging foreign reactors, whose maintenance and repair shutdowns in recent years have significantly disrupted supply. LANL and Argonne National Laboratory (ANL) with NorthStar Medical Technologies, LLC are conducting experiments to develop and demonstrate technology necessary for large scale production of "Mo using high-power electron accelerators. "Mo is produced with electron accelerators using the (100)Mo( gamma , n) Mo reaction in an enriched (l00)Mo target. This reaction has a threshold of 9 MeV and a peak cross section of 150 mb. The photons for this reaction are generated by bremsstrahlung as the electron beam from the accelerator collides with the target. After irradiation, the low specific activity "Mo is separated from the target using a two column generator developed by NorthStar Medical Technologies, LLC [1]. LANL is also working on technology supporting fission production of (99)Mo in low enriched uranium (LEU) solutions with SHINE Medical Technologies, LLC. "Mo is a (235)U fission product with a 6% yield. The use of aqueous homogeneous reactors and accelerator driven systems are being considered. LANL is conducting experiments to develop and demonstrate the LEU solution chemistry necessary for these technology pathways. A new irradiation capability was designed and installed at the Los Alamos Neutron Science Center (LANSCE) Weapons Neutron Research (WNR) facility for these experiments. JF - Transactions of the American Nuclear Society AU - Kelsey, C T, IV AU - Dale, G E AU - Woloshun, K A AU - Olivas, E R AU - Mocko, M AU - May, I AU - Holloway, M A AU - Hurtle, K P AU - Romero, F P AU - Dalmas, D A AD - Los Alamos Neutron Science Center, Los Alamos National Laboratory, P O Box 1663, Los Alamos, New Mexico 87544 ckelsey@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 12 EP - 13 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear power generation KW - Nuclear reactors KW - Medical KW - Accelerators KW - Nuclear medicine KW - Nuclear reactor components KW - Enrichment KW - Conduction UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429883054?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Experiments+Supporting+the+Development+of+Mo-99+Production+Technologies+without+HEU&rft.au=Kelsey%2C+C+T%2C+IV%3BDale%2C+G+E%3BWoloshun%2C+K+A%3BOlivas%2C+E+R%3BMocko%2C+M%3BMay%2C+I%3BHolloway%2C+M+A%3BHurtle%2C+K+P%3BRomero%2C+F+P%3BDalmas%2C+D+A&rft.aulast=Kelsey&rft.aufirst=C&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=12&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 4 N1 - Last updated - 2013-09-05 ER - TY - JOUR T1 - Experimental Results of Joint LANL/CEA Measurements on CALIBAN AN - 1429883015; 18278267 AB - The CALIBAN reactor is an unreflected highly enriched metal fast burst reactor located at the CEA Valduc center in France. Measurements were performed in June 2012 with neutron detectors consisting of He-3 tubes embedded in polyethylene near the CALIBAN assembly. In total, 17 configurations were measured: 13 were subcritical, two were at delayed critical, and two were above delayed critical. Multiple configurations at different reactivity states were obtained by varying the safety block and control rod positions. Two different detector positions were used. The neutron data that were produced were used to approximate the multiplication of each measured configuration. These measurements are particularly useful to compare with a known benchmarked system in which one can assess the reactivity and multiplication using a number of methods. JF - Transactions of the American Nuclear Society AU - Hutchinson, J AU - Rooney, B AU - Myers, W AU - Sood, A AU - Smith-Nelson, M AU - Authier, N AU - Chapelle, A AU - Casoli, P AU - Richard, B AD - Los Alamos National Laboratory, MS-B228, Los Alamos, New Mexico 87545 Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 704 EP - 706 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear power generation KW - Multiplication KW - Nuclear reactors KW - Blocking KW - Assembly KW - Nuclear reactor components KW - Approximation KW - Nuclear engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429883015?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Experimental+Results+of+Joint+LANL%2FCEA+Measurements+on+CALIBAN&rft.au=Hutchinson%2C+J%3BRooney%2C+B%3BMyers%2C+W%3BSood%2C+A%3BSmith-Nelson%2C+M%3BAuthier%2C+N%3BChapelle%2C+A%3BCasoli%2C+P%3BRichard%2C+B&rft.aulast=Hutchinson&rft.aufirst=J&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=704&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 6 N1 - Last updated - 2013-09-05 ER - TY - JOUR T1 - The Effects of Pin Conduction in CFD Simulations of SFR Pin-Bundles AN - 1429877226; 18278340 AB - The RANS-based CFD simulation results are compared with the EBR-II X494 and X495 experimental results and the results from a subchannel code. Large differences were found in all code predictions. However, considering the large uncertainty of the TED temperature measurements in the experiments, the CFD simulation results are reasonably well in agreement with the experiments. Additionally, the CFD temperature predications are overestimated at the inner pins but underestimated at the outer pins if a fixed heat flux boundary condition is used. It can be concluded that the detailed conjugate heat transfer should be modeled to account for the heat conduction in the fuel pins for more accurate temperature predictions in the wire-wrapped pin-bundles. JF - Transactions of the American Nuclear Society AU - Hu, Rui AD - Argonne National Laboratory: 9700 S Cass Avenue, Argonne, IL 60439, USA rhu@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 991 EP - 993 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE); Aerospace & High Technology Database (AH) KW - Heat conduction KW - Computational fluid dynamics KW - Mathematical models KW - Computer simulation KW - Simulation KW - Conjugates KW - Conduction KW - Heat transfer UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429877226?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=The+Effects+of+Pin+Conduction+in+CFD+Simulations+of+SFR+Pin-Bundles&rft.au=Hu%2C+Rui&rft.aulast=Hu&rft.aufirst=Rui&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=991&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 5 N1 - Last updated - 2014-04-08 ER - TY - JOUR T1 - An Improved C-12 Proton Capture Library for Emitting Correct Mono-energetic Gamma Spectra AN - 1429876506; 18278254 AB - A newly updated C-12 proton ACE file has been created that leverages actual measured data to produce the correct secondary photon production for E(p) less than or equal to 20 MeV. The process for developing the new ACE file is automated; and therefore as new data is discovered, the file can be easily updated. Because our particular application involved, E(p) less than or equal to 20 MeV, greater than 20 MeV cross section information was not altered at this time. The elastic, total (and therefore absorption) and production cross sections were altered. The results provided in Figures 1 and 3 only address the emission spectrum per interaction. Therefore an actual benchmark will be required to test the validity of the new cross section values, which we intend to complete at the end of the project. Also, there exists only a single production cross section that is combined with various secondary particle yields to compute the secondary particle production. In developing Nuclear Resonance Fluorescence cross sections it was identified that updating the production cross sections can severely alter the production of other secondary particles.13 Our particular application only focused on photon production and therefore in the future we will need to examine the effect on other secondary particle generation versus measured data. Nonetheless, with this new library we are able to examine how to develop effective filtering and shielding for accelerator's that use protons on C-12 to generate photons for interrogating fissionable material through photofission events; and due to the structure of the C-12 cross section, this reaction may be most effective for this type of interrogation process. JF - Transactions of the American Nuclear Society AU - Fensin, M L AU - McKinney, G W AD - Los Alamos National Laboratory, MS-C921, Los Alamos, NM87545 mfensin@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 656 EP - 659 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Particle production KW - Photons KW - Spectral emittance KW - Libraries KW - Filtering KW - Capture (nuclear) KW - Interrogation KW - Cross sections UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429876506?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=An+Improved+C-12+Proton+Capture+Library+for+Emitting+Correct+Mono-energetic+Gamma+Spectra&rft.au=Fensin%2C+M+L%3BMcKinney%2C+G+W&rft.aulast=Fensin&rft.aufirst=M&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=656&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 13 N1 - Last updated - 2013-10-07 ER - TY - JOUR T1 - Full Core Burnup Calculations with Monteburns version 3.0 AN - 1429876428; 18278294 AB - The recent upgrades to Monteburns have greatly increased the code's potential for performing benchmark calculations or spent fuel characterization studies by individually burning every pin in 1/8 a PWR core using MCNP as has never been done before. While obviously not fast enough to be a production-level tool, the fidelity offered through pin-by-pin isotopics is extremely beneficial. The simulation performed for a 1/8th core model had no axial fidelity. The limiting factor in runs this big is the maximum computational resources available, specifically the amount of memory. Given that in this case only 1/3 of the total memory was used, theoretically this run could then be segmented into three axial segments. Additionally, fewer computers per node could be used to shrink the memory footprint even further while adding to the required time for the calculation. With the advances in computer architecture, the ability to perform full core calculations with continuous energy MCNP is close. One arena where this tool may be very useful is the recent interest in small modular reactors (SMRs). Given the smaller core size, the ability to model the full core with coarse axial fidelity, or taking advantage of symmetry and modeling with high axial fidelity is possible. Taking the NuScale Power design as a test case, pin-by-pin calculations with axial segmenting based on this design, particularly if symmetry is taken into account, are viable using 6,500 materials as a benchmark. In the NuScale design, the core contains 24 fuel assemblies, which are "17x17 standard fuel assemblies". If the full core was to be modeled, assuming the same geometry as the 17x17 assembly in the model presented here, this would total 6,336 fuel pins for the full core. It has already been stated that a fidelity of 3-5 axial segments could be modeled starting from ~6,500. However if octal symmetry were taken advantage of, this would allow for eight times greater axial fidelity, which in this case would all for 24-40 axial segments since the number of fuel pins would then be reduced to 792. In conclusion, this research shows the enhanced capability of MCNP and Monteburns for high fidelity burnup calculations of nuclear reactors. JF - Transactions of the American Nuclear Society AU - Galloway Jack, D AU - Trellue Holly, R AD - Los Alamos National Laboratory, 30 Bikini Atoll Rd Los Alamos, NM87545-000 Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 806 EP - 809 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Nuclear power generation KW - Mathematical models KW - Computer simulation KW - Fuels KW - Segments KW - Assemblies KW - Symmetry KW - Tools UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429876428?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Full+Core+Burnup+Calculations+with+Monteburns+version+3.0&rft.au=Galloway+Jack%2C+D%3BTrellue+Holly%2C+R&rft.aulast=Galloway+Jack&rft.aufirst=D&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=806&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 7 N1 - Last updated - 2013-09-05 ER - TY - JOUR T1 - Salt Formations, a Safe Place for Transuranic Waste Disposal AN - 1429875263; 18278121 AB - A very well-known study by the National Academy of Sciences National Research Council in the 1950s concluded that the most promising method of disposal of nuclear waste was in salt deposits'. Over time, research has been conducted to advance the state of knowledge with respect to nuclear waste isolation in salt. The use of salt formations for radioactive waste disposal has been demonstrated by virtue of more than ten years of successful operations at the Waste Isolation Pilot Plant (WIPP) near Carlsbad, New Mexico. The WIPP has been the only nuclear waste repository in the United States designated to dispose defense-related transuranic (TRU) waste. This paper gives an overview of the favorable repository conditions offered by the salt formation to permanently and safely isolate long-lived radioactive wastes from the environment. JF - Transactions of the American Nuclear Society AU - Lucchini, J F AU - Borkowski, M AU - Swanson, J AU - Cleveland, D AU - Richmann, M K AU - Reed, D T AD - Los Alamos National Laboratory, EES-12, 115 N Main Carlsbad N M 88220 USA lucchini@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 149 EP - 150 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Radioactive waste disposal KW - Nuclear waste KW - Repositories KW - Formations KW - Pilot plants KW - Wastes KW - Waste disposal KW - Waste management UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429875263?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Salt+Formations%2C+a+Safe+Place+for+Transuranic+Waste+Disposal&rft.au=Lucchini%2C+J+F%3BBorkowski%2C+M%3BSwanson%2C+J%3BCleveland%2C+D%3BRichmann%2C+M+K%3BReed%2C+D+T&rft.aulast=Lucchini&rft.aufirst=J&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=149&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 7 N1 - Last updated - 2014-04-08 ER - TY - JOUR T1 - Release of ENDF/B-VII.1-based Continuous-Energy Neutron Cross-Section Data Tables for MCNP AN - 1429874781; 18278212 AB - The release of the ENDF71x library represents five years of work updating ENDF/B-VII.0 to ENDF/B-VII.1 followed by a full years worth of work by the Nuclear Data Team at LANL. The library was processed from ENDF/B-VII.1 evaluations into ACE data tables using NJOY 99.393 for seven temperatures. The ENDF71x library has been heavily tested and verified. The ENDF71x library is recommended for use in all Monte Carlo applications with the caveats detailed in this summary and in the complete documentation. JF - Transactions of the American Nuclear Society AU - Conlin, Jeremy Lloyd AU - Gardiner Steven, J AU - Kent Parsons, D AU - Kahler, A C AU - Beth Lee, M AU - White Morgan, C AD - Los Alamos National Laboratory, Los Alamos, NM 87544 jlconlin@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 473 EP - 476 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Documentation KW - Monte Carlo methods KW - Libraries KW - Tables KW - Summaries KW - Cross sections UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429874781?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Release+of+ENDF%2FB-VII.1-based+Continuous-Energy+Neutron+Cross-Section+Data+Tables+for+MCNP&rft.au=Conlin%2C+Jeremy+Lloyd%3BGardiner+Steven%2C+J%3BKent+Parsons%2C+D%3BKahler%2C+A+C%3BBeth+Lee%2C+M%3BWhite+Morgan%2C+C&rft.aulast=Conlin&rft.aufirst=Jeremy&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=473&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 11 N1 - Last updated - 2013-09-05 ER - TY - JOUR T1 - MCNP Simulations in Support of the Heat Pipe in Flat-Top Experiment AN - 1429866414; 18278221 AB - A series of MCNP simulations were performed to estimate the excess reactivity of a heat pipe inserted in the glory hole of the Flat-Top assembly. The purpose of the experiment was to demonstrate that a heat pipe coupled to a Stirling engine could generate electricity from a nuclear generated heat source. This experiment demonstrated a new concept for a reliable nuclear reactor for space missions. The heat source used to generate this electricity originated in the Flat-Top assembly. During certain operations of the Flat-Top assembly, temperature increases are generated in the core, which creates a temperature gradient between the center of the core and the ambient temperature of the room. Typically this excess energy will be removed from the assembly through air convection or heat conduction to the supporting table. However, it is possible to use other means to remove this energy from the assembly, such as through a heat pipe. A heat pipe is a device that is used to transfer energy from one solid surface to another solid surface, typically with the assistance of a working fluid or coolant. For the heat pipe used in this experiment the working fluid was water. The heat pipe was connected to a Stirling engine and the energy transferred to the Stirling engine was converted to electricity. To generate the energy needed to provide the temperature increases in the core, the Flat-Top assembly was operated in a supercritical regime. The simulations presented in this summary provided the basis to load the Flat-Top assembly with enough excess reactivity that would produce the energy needed for the experiment but also not exceed the operating reactivity limit of $0.80. JF - Transactions of the American Nuclear Society AU - Sanchez, Rene AU - Hayes, David AU - Bounds, John AU - Goda, Joetta AU - Grove, Travis AU - Myers, William AD - Los Alamos National Laboratory: P O Box 1663, Los Alamos, NM, 87545 rsanchez@lanl.gov Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 506 EP - 508 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Energy use KW - Solid surfaces KW - Working fluids KW - Simulation KW - Assembly KW - Electricity KW - Stirling engines KW - Heat pipes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429866414?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=MCNP+Simulations+in+Support+of+the+Heat+Pipe+in+Flat-Top+Experiment&rft.au=Sanchez%2C+Rene%3BHayes%2C+David%3BBounds%2C+John%3BGoda%2C+Joetta%3BGrove%2C+Travis%3BMyers%2C+William&rft.aulast=Sanchez&rft.aufirst=Rene&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=506&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 2 N1 - Last updated - 2013-09-05 ER - TY - JOUR T1 - Automated Design of Robotic/Human Manufacturing Workcells in Radioactive Environments AN - 1419358619; 18278328 AB - The design of manufacturing systems in radioactive and other hazardous environments requires knowledge from various fields. This includes considerations relevant to mechanical, electrical, and nuclear engineering, chemistry, materials science, ergonomics, and safety. Environmental conditions typically constrain the type of components and operators (human or robotic) that can be used. Additionally, determining whether automation and/or robotics is suitable for a task also involves considering compatibility with task requirements. When conceptualizing designs for a hazardous process, some options may be overlooked or unknowingly infeasible due to the design engineers' lack of knowledge in a particular field or ineffective communication of requirements between disciplines. Design for dose minimization or improved ergonomics, for example, is less effective if more favorable designs are excluded for the above reasons. A computational design tool that stores multi-domain knowledge to make informed decisions about component and operator compatibility can help alleviate such design issues. JF - Transactions of the American Nuclear Society AU - Williams Joshua, M AU - Pryor Mitch, W AD - Los Alamos National Laboratory: P O Box 1663, MS E511, Los Alamos, NM, 87545, jmwilliams@utexas.edu Y1 - 2013/06// PY - 2013 DA - Jun 2013 SP - 945 EP - 948 PB - American Nuclear Society, Inc. VL - 108 SN - 0003-018X, 0003-018X KW - Health & Safety Science Abstracts KW - Communications KW - Safety engineering KW - Automation KW - Environmental conditions KW - Ergonomics KW - Design KW - H 6000:Natural Disasters/Civil Defense/Emergency Management UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1419358619?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthsafetyabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transactions+of+the+American+Nuclear+Society&rft.atitle=Automated+Design+of+Robotic%2FHuman+Manufacturing+Workcells+in+Radioactive+Environments&rft.au=Williams+Joshua%2C+M%3BPryor+Mitch%2C+W&rft.aulast=Williams+Joshua&rft.aufirst=M&rft.date=2013-06-01&rft.volume=108&rft.issue=&rft.spage=945&rft.isbn=&rft.btitle=&rft.title=Transactions+of+the+American+Nuclear+Society&rft.issn=0003018X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-08-01 N1 - Number of references - 10 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Communications; Safety engineering; Automation; Environmental conditions; Ergonomics; Design ER - TY - JOUR T1 - The effect of high ionic strength on neptunium (V) adsorption to a halophilic bacterium AN - 1400619764; 2013-053767 AB - The mobility of neptunium (V) in subsurface high ionic strength aqueous systems may be strongly influenced by adsorption to the cell wall of the halophilic bacteria Chromohalobacter sp. This study is the first to evaluate the adsorption of neptunium (V) to the surface of a halophilic bacterium as a function of pH from approximately 2 to 10 and at ionic strengths of 2 and 4M. This is also the first study to evaluate the effects of carbonate complexation with neptunium (V) on adsorption to whole bacterial cells under high pH conditions. A thermodynamically-based surface complexation model was adapted to describe experimental adsorption data under high ionic strength conditions where traditional corrections for aqueous ion activity are invalid. Adsorption of neptunium (V) was rapid and reversible under the conditions of the study. Adsorption was significant over the entire pH range evaluated for both ionic strength conditions and was shown to be dependent on the speciation of the sites on the bacterial surface and neptunium (V) in solution. Adsorption behavior was controlled by the relatively strong electrostatic attraction of the positively charged neptunyl ion to the negatively charged bacterial surface at pH below circum-neutral. At pH above circum-neutral, the adsorption behavior was controlled by the presence of negatively charged neptunium (V) carbonate complexes resulting in decreased adsorption, although adsorption was still significant due to the adsorption of negatively charged neptunyl-carbonate species. Adsorption in 4M NaClO (sub 4) was enhanced relative to adsorption in 2M NaClO (sub 4) over the majority of the pH range evaluated, likely due to the effect of increasing aqueous ion activity at high ionic strength. The protonation/deprotonation characteristics of the cell wall of Chromohalobacter sp. were evaluated by potentiometric titrations in 2 and 4M NaClO (sub 4) . Bacterial titration results indicated that Chromohalobacter sp. exhibits similar proton buffering capacity to previously studied non-halophilic bacteria. The titration data were used to determine the number of types, concentrations, and associated deprotonation constants of functional groups on the bacterial surface; the neptunium adsorption measurements were used to constrain binding constant values for the important neptunium (V)-bacterial surface species. Together, these results can be incorporated into geochemical speciation models to aid in the prediction of neptunium (V) mobility in complex bacteria-bearing geochemical systems. Abstract Copyright (2013) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Ams, David A AU - Swanson, Juliet S AU - Szymanowski, Jennifer E S AU - Fein, Jeremy B AU - Richmann, Michael AU - Reed, Donald T Y1 - 2013/06/01/ PY - 2013 DA - 2013 Jun 01 SP - 45 EP - 57 PB - Elsevier, New York, NY VL - 110 SN - 0016-7037, 0016-7037 KW - neptunium KW - biochemistry KW - complexing KW - aqueous solutions KW - adsorption KW - models KW - biogenic processes KW - metals KW - mathematical methods KW - bacteria KW - mobilization KW - thermodynamic properties KW - actinides KW - pH KW - chemical fractionation KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400619764?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=The+effect+of+high+ionic+strength+on+neptunium+%28V%29+adsorption+to+a+halophilic+bacterium&rft.au=Ams%2C+David+A%3BSwanson%2C+Juliet+S%3BSzymanowski%2C+Jennifer+E+S%3BFein%2C+Jeremy+B%3BRichmann%2C+Michael%3BReed%2C+Donald+T&rft.aulast=Ams&rft.aufirst=David&rft.date=2013-06-01&rft.volume=110&rft.issue=&rft.spage=45&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2013.01.024 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 40 N1 - PubXState - NY N1 - Document feature - illus. incl. 3 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-07-18 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - actinides; adsorption; aqueous solutions; bacteria; biochemistry; biogenic processes; chemical fractionation; complexing; mathematical methods; metals; mobilization; models; neptunium; pH; thermodynamic properties DO - http://dx.doi.org/10.1016/j.gca.2013.01.024 ER - TY - JOUR T1 - Super-resolution ultrasound imaging using a phase-coherent MUSIC method with compensation for the phase response of transducer elements AN - 1372658267; 18148011 AB - Time-reversal with multiple signal classification (TR-MUSIC) is an imaging method for locating point-like targets beyond the classic resolution limit. In the presence of noise, however, the super-resolution capability of TR-MUSIC is diminished. Recently a new method, phase-coherent MUSIC (PC-MUSIC), was developed. This algorithm modifies TR-MUSIC to make use of phase information from multiple frequencies to reduce noise effects and preserve the super resolution. PC-MUSIC however, ignores the phase response of the transducer elements. In this paper, we account for the phase response of the transducer elements in the derivation of the PC-MUSIC algorithm. Unfortunately, the phase response of the transducer elements may not be known beforehand. We develop an experimental method to estimate this response using measured signals scattered from a glass microsphere embedded in a tissue-mimicking phantom with a homogeneous background medium of a known sound speed. We use numerical simulations to illustrate that the maximum resolution achieved with PC-MUSIC is limited by the transducer bandwidth and the signal-to-noise ratio. We perform experiments on tissue-mimicking phantoms and compare images obtained with different imaging modalities, including X-ray mammography, synthetic-aperture ultrasound imaging, TR-MUSIC, and PC-MUSIC. We demonstrate the significantly improved resolving power of PC-MUSIC. JF - IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control AU - Labyed, Yassin AU - Huang, Lianjie AD - Los Alamos National Laboratory Y1 - 2013/06// PY - 2013 DA - Jun 2013 PB - Institute of Electrical and Electronics Engineers, Inc., 3 Park Avenue, 17th Fl New York NY 10016-5997 United States VL - 60 IS - 6 SN - 0885-3010, 0885-3010 KW - Biotechnology and Bioengineering Abstracts KW - Mathematical models KW - Mammography KW - Classification KW - Ultrasonics KW - Ionizing radiation KW - Algorithms KW - microspheres KW - imaging KW - Ultrasound KW - W 30910:Imaging UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372658267?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=IEEE+Transactions+on+Ultrasonics%2C+Ferroelectrics+and+Frequency+Control&rft.atitle=Super-resolution+ultrasound+imaging+using+a+phase-coherent+MUSIC+method+with+compensation+for+the+phase+response+of+transducer+elements&rft.au=Labyed%2C+Yassin%3BHuang%2C+Lianjie&rft.aulast=Labyed&rft.aufirst=Yassin&rft.date=2013-06-01&rft.volume=60&rft.issue=6&rft.spage=&rft.isbn=&rft.btitle=&rft.title=IEEE+Transactions+on+Ultrasonics%2C+Ferroelectrics+and+Frequency+Control&rft.issn=08853010&rft_id=info:doi/10.1109%2FTUFFC.2013.2669 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Mammography; Mathematical models; Classification; Ultrasonics; Ionizing radiation; microspheres; Algorithms; Ultrasound; imaging DO - http://dx.doi.org/10.1109/TUFFC.2013.2669 ER - TY - JOUR T1 - Martian fluvial conglomerates at Gale Crater AN - 1400616407; 2013-054323 AB - Observations by the Mars Science Laboratory Mast Camera (Mastcam) in Gale crater reveal isolated outcrops of cemented pebbles (2 to 40 millimeters in diameter) and sand grains with textures typical of fluvial sedimentary conglomerates. Rounded pebbles in the conglomerates indicate substantial fluvial abrasion. ChemCam emission spectra at one outcrop show a predominantly feldspathic composition, consistent with minimal aqueous alteration of sediments. Sediment was mobilized in ancient water flows that likely exceeded the threshold conditions (depth 0.03 to 0.9 meter, average velocity 0.20 to 0.75 meter per second) required to transport the pebbles. Climate conditions at the time sediment was transported must have differed substantially from the cold, hyper-arid modern environment to permit aqueous flows across several kilometers. JF - Science AU - Williams, Rebecca M E AU - Grotzinger, J P AU - Dietrich, W E AU - Gupta, S AU - Sumner, D Y AU - Wiens, R C AU - Mangold, N AU - Malin, M C AU - Edgett, K S AU - Maurice, S AU - Forni, O AU - Gasnault, O AU - Ollila, A AU - Newsom, H E AU - Dromart, G AU - Palucis, M C AU - Yingst, R A AU - Anderson, R B AU - Herkenhoff, K E AU - Le Mouelic, S AU - Goetz, W AU - Madsen, M B AU - Koefoed, A AU - Jensen, J K AU - Bridges, J C AU - Schwenzer, S P AU - Lewis, K W AU - Stack, K M AU - Rubin, D M AU - Kah, L C AU - Bell, J F, III AU - Farmer, J D AU - Sullivan, R AU - Van Beek, T L AU - Blaney, D L AU - Pariser, O AU - Deen, R G Y1 - 2013/05/31/ PY - 2013 DA - 2013 May 31 SP - 1068 EP - 1072 PB - American Association for the Advancement of Science, Washington, DC VL - 340 IS - 6136 SN - 0036-8075, 0036-8075 KW - Mast Camera KW - imagery KW - Mars KW - Bradbury Rise KW - photography KW - conglomerate KW - Gale Crater KW - terrestrial planets KW - Mars Exploration Rover KW - planets KW - sedimentary rocks KW - outcrops KW - depositional environment KW - fluvial environment KW - clastic rocks KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400616407?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Martian+fluvial+conglomerates+at+Gale+Crater&rft.au=Williams%2C+Rebecca+M+E%3BGrotzinger%2C+J+P%3BDietrich%2C+W+E%3BGupta%2C+S%3BSumner%2C+D+Y%3BWiens%2C+R+C%3BMangold%2C+N%3BMalin%2C+M+C%3BEdgett%2C+K+S%3BMaurice%2C+S%3BForni%2C+O%3BGasnault%2C+O%3BOllila%2C+A%3BNewsom%2C+H+E%3BDromart%2C+G%3BPalucis%2C+M+C%3BYingst%2C+R+A%3BAnderson%2C+R+B%3BHerkenhoff%2C+K+E%3BLe+Mouelic%2C+S%3BGoetz%2C+W%3BMadsen%2C+M+B%3BKoefoed%2C+A%3BJensen%2C+J+K%3BBridges%2C+J+C%3BSchwenzer%2C+S+P%3BLewis%2C+K+W%3BStack%2C+K+M%3BRubin%2C+D+M%3BKah%2C+L+C%3BBell%2C+J+F%2C+III%3BFarmer%2C+J+D%3BSullivan%2C+R%3BVan+Beek%2C+T+L%3BBlaney%2C+D+L%3BPariser%2C+O%3BDeen%2C+R+G&rft.aulast=Williams&rft.aufirst=Rebecca+M&rft.date=2013-05-31&rft.volume=340&rft.issue=6136&rft.spage=1068&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1237317 L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 42 N1 - PubXState - DC N1 - Document feature - illus. incl. sketch map N1 - SuppNotes - Related article by Jerolmack, D. J., on pp. 1055-1056 N1 - Last updated - 2013-07-18 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - Bradbury Rise; clastic rocks; conglomerate; depositional environment; fluvial environment; Gale Crater; imagery; Mars; Mars Exploration Rover; Mast Camera; outcrops; photography; planets; sedimentary rocks; terrestrial planets DO - http://dx.doi.org/10.1126/science.1237317 ER - TY - JOUR T1 - Metal-lined semiconductor nanotubes for surface plasmon-mediated luminescence enhancement. AN - 1349704079; 23573911 AB - Highly efficient solid-state light-emitting devices require semiconductor architectures equipped with high quantum efficiency and integratability on conductive substrates. Surface plasmon (SP)-mediated luminescence enhancement has been considered as one of the most promising solutions, because SP resonance can greatly improve the radiative recombination rate and be achieved using metal entities compatible with the electrode fabrication process. Nevertheless, metal/semiconductor heterostructures have had several fabrication-compatible issues due to metal as a potential contaminant of the semiconductor. We present here a simple fabrication scheme for a metal-lined semiconductor nanotube heterostructure, in which a metal layer is selectively formed on the inner wall of the semiconductor nanotube. The Ag-lining process in a ZnO nanotube resulted in 7.5-fold enhancement of the photoluminescence intensity at 11 K. This SP fabrication technique looks promising for highly efficient solid-state lighting based on semiconductor nanostructures without detrimental effects. JF - Nano letters AU - Yoo, Jinkyoung AU - Ma, Xuedan AU - Tang, Wei AU - Yi, Gyu-Chul AD - National Creative Research Initiative Center for Semiconductor Nanorods, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, Korea. jyoo@lanl.gov Y1 - 2013/05/08/ PY - 2013 DA - 2013 May 08 SP - 2134 EP - 2140 VL - 13 IS - 5 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1349704079?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nano+letters&rft.atitle=Metal-lined+semiconductor+nanotubes+for+surface+plasmon-mediated+luminescence+enhancement.&rft.au=Yoo%2C+Jinkyoung%3BMa%2C+Xuedan%3BTang%2C+Wei%3BYi%2C+Gyu-Chul&rft.aulast=Yoo&rft.aufirst=Jinkyoung&rft.date=2013-05-08&rft.volume=13&rft.issue=5&rft.spage=2134&rft.isbn=&rft.btitle=&rft.title=Nano+letters&rft.issn=1530-6992&rft_id=info:doi/10.1021%2Fnl400547z LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2013-12-04 N1 - Date created - 2013-05-08 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/nl400547z ER - TY - JOUR T1 - Modeling wind fields and fire propagation following bark beetle outbreaks in spatially-heterogeneous pinyon-juniper woodland fuel complexes AN - 1770361375; PQ0002254937 AB - We used a physics-based model, HIGRAD/FIRETEC, to explore changes in within-stand wind behavior and fire propagation associated with three time periods in pinyon-juniper woodlands following a drought-induced bark beetle outbreak and subsequent tree mortality. Pinyon-juniper woodland fuel complexes are highly heterogeneous. Trees often are clumped, with sparse patches of herbaceous vegetation scattered between clumps. Extensive stands of dead pinyon trees intermixed with live junipers raised concerns about increased fire hazard, especially immediately after the trees died and dead needles remained in the trees, and later when the needles had dropped to the ground. Studying fire behavior in such conditions requires accounting for the impacts of the evolving heterogeneous nature of the woodlands and its influence on winds that drive fires. For this reason we used a coupled atmosphere/fire model, HIGRAD/FIRETEC, to examine the evolving stand structure effects on wind penetration through the stand and subsequent fire propagation in these highly heterogeneous woodlands. Specifically, we studied how these interactions changed in woodlands without tree mortality, in the first year when dried needles clung to the dead trees, and when the needles dropped to the ground under two ambient wind speeds. Our simulations suggest that low wind speeds of 2.5m/s at 7.5-m height were not sufficient to carry the fire through the discontinuous woodland stands without mortality, but 4.5m/s winds at 7.5-m height were sufficient to carry the fire. Fire propagation speed increased two-fold at these low wind speeds when dead needles were on the trees compared to live woodlands. When dead needles fell to the ground, fine fuel loadings were increased and ambient wind penetration was increased enough to sustain burning even at low wind speeds. At the higher ambient wind speeds, fire propagation in woodlands with dead needles on the trees also increased by a factor of similar to 2 over propagation in live woodlands. These simulations indicate that sparse fuels in these heterogeneous woodlands can be overcome in three ways: by decreasing fuel moisture content of the needles with the death of the trees, by moving canopy dead needles to the ground and thus allowing greater wind penetration and turbulent flow into the woodland canopy, and increasing above-canopy wind speeds. JF - Agricultural and Forest Meteorology AU - Linn, Rodman R AU - Sieg, Carolyn H AU - Hoffman, Chad M AU - Winterkamp, Judith L AU - McMillin, Joel D AD - Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87544, USA Y1 - 2013/05// PY - 2013 DA - May 2013 SP - 139 EP - 153 PB - Elsevier B.V., The Boulevard Kidlington Oxford OX5 1GB United Kingdom VL - 173 SN - 0168-1923, 0168-1923 KW - Environmental Engineering Abstracts (EN); CSA / ASCE Civil Engineering Abstracts (CE); Aerospace & High Technology Database (AH) KW - Heterogeneous woodlands KW - Bark beetle tree mortality KW - Fire behavior KW - FIRETEC KW - Wind turbulence KW - Wind speed KW - Needles KW - Fires KW - Woodlands KW - Trees KW - Grounds KW - Fuels KW - Stands UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1770361375?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Agricultural+and+Forest+Meteorology&rft.atitle=Modeling+wind+fields+and+fire+propagation+following+bark+beetle+outbreaks+in+spatially-heterogeneous+pinyon-juniper+woodland+fuel+complexes&rft.au=Linn%2C+Rodman+R%3BSieg%2C+Carolyn+H%3BHoffman%2C+Chad+M%3BWinterkamp%2C+Judith+L%3BMcMillin%2C+Joel+D&rft.aulast=Linn&rft.aufirst=Rodman&rft.date=2013-05-01&rft.volume=173&rft.issue=&rft.spage=139&rft.isbn=&rft.btitle=&rft.title=Agricultural+and+Forest+Meteorology&rft.issn=01681923&rft_id=info:doi/10.1016%2Fj.agrformet.2012.11.007 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-03-01 N1 - Number of references - 78 N1 - Last updated - 2017-01-05 DO - http://dx.doi.org/10.1016/j.agrformet.2012.11.007 ER - TY - JOUR T1 - A mechanism for bringing ice and brines to the near surface of Mars AN - 1656034174; 2013-088381 AB - Recent discovery of transient ice deposits uncovered by five small craters between 40 and 55 degrees N latitude, reinterpretation of MONS neutron data that indicate the wide-spread presence of ice within 1 m of the surface at midlatitudes (down to 30 degrees N) of Mars, and evidence of recent periglacial activity within 10 degrees N of the equator, all suggest ice may be or recently was present at latitudes where it is not expected and at unexplained abundance. As ice may be unstable under present Mars climatic conditions, a mechanism may be needed to explain the presence of ice in the near surface at these latitudes. Water release history, chemical composition, and heat fluxes are variable over the surface of Mars, and there could be more than one mechanism responsible for near-surface ice. The purpose of this study is to show that hydrothermal circulation of brines in the subsurface of Mars is a possible mechanism that can deposit ice and brine, close to, or even at, the surface of Mars. Furthermore, the action of brine convection can be related to some of the surface features associated with subsurface water during previous or even present epochs, such as polygonal ground and sorted stone circles. Abstract Copyright (2013). American Geophysical Union. All Rights Reserved. JF - Journal of Geophysical Research: Planets AU - Travis, Bryan J AU - Feldman, William C AU - Maurice, Sylvestre Y1 - 2013/05// PY - 2013 DA - May 2013 SP - 877 EP - 890 PB - Wiley-Blackwell for American Geophysical Union, Washington, DC VL - 118 IS - 5 SN - 2169-9097, 2169-9097 KW - upwelling KW - impact features KW - mechanism KW - Mars KW - aqueous solutions KW - freezing KW - simulation KW - geothermal systems KW - transport KW - circulation KW - ice KW - ground ice KW - polygons KW - climate KW - heat flux KW - numerical models KW - three-dimensional models KW - cyclic processes KW - ice lenses KW - convection KW - boundary conditions KW - two-dimensional models KW - terrestrial planets KW - planets KW - transient phenomena KW - brines KW - impact craters KW - latitude KW - glacial geology KW - regolith KW - permeability KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656034174?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research%3A+Planets&rft.atitle=A+mechanism+for+bringing+ice+and+brines+to+the+near+surface+of+Mars&rft.au=Travis%2C+Bryan+J%3BFeldman%2C+William+C%3BMaurice%2C+Sylvestre&rft.aulast=Travis&rft.aufirst=Bryan&rft.date=2013-05-01&rft.volume=118&rft.issue=5&rft.spage=877&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research%3A+Planets&rft.issn=21699097&rft_id=info:doi/10.1002%2Fjgre.20074 L2 - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%292169-9100 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 82 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2015-02-19 N1 - SubjectsTermNotLitGenreText - aqueous solutions; boundary conditions; brines; circulation; climate; convection; cyclic processes; freezing; geothermal systems; glacial geology; ground ice; heat flux; ice; ice lenses; impact craters; impact features; latitude; Mars; mechanism; numerical models; permeability; planets; polygons; regolith; simulation; terrestrial planets; three-dimensional models; transient phenomena; transport; two-dimensional models; upwelling DO - http://dx.doi.org/10.1002/jgre.20074 ER - TY - JOUR T1 - Two modes of sea-ice gravity drainage; a parameterization for large-scale modeling AN - 1502293360; 2014-014350 AB - We present a new one-dimensional parameterization of gravity drainage implemented in an all-new thermodynamic component of the Los Alamos Sea Ice Model (CICE), based on mushy layer theory. We solve a set of coupled, nonlinear equations for sea-ice temperature (enthalpy) and salinity using an implicit Jacobian-free Newton-Krylov method. Time resolved observations of gravity drainage show two modes of desalination during growth. Rapid drainage occurs in a thin region just above the ice/ocean interface, while slower drainage occurs throughout the ice. Parameterizations are designed to represent each of these modes and work simultaneously. Near the interface, desalination occurs primarily via the fast drainage, while slow drainage continues to desalinate ice above the interface. The rapid desalination is convectively driven and is parameterized based on a consideration of flow driven upward within the mush and downward in chimneys, modified by the Rayleigh number. The slow desalination is represented as a simple relaxation of bulk salinity to a value based on a critical porosity for sea-ice permeability. It is shown that these parameterizations can adequately reproduce observational data from laboratory experiments and field measurements. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Journal of Geophysical Research: Oceans AU - Turner, Adrian K AU - Hunke, Elizabeth C AU - Bitz, Cecilia M Y1 - 2013/05// PY - 2013 DA - May 2013 SP - 2279 EP - 2294 PB - Wiley-Blackwell for American Geophysical Union, Washington, DC VL - 118 IS - 5 SN - 2169-9275, 2169-9275 KW - models KW - laboratory studies KW - Rayleigh number KW - experimental studies KW - ice KW - sea ice KW - thermodynamic properties KW - salinity KW - porosity KW - permeability KW - temperature KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1502293360?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research%3A+Oceans&rft.atitle=Two+modes+of+sea-ice+gravity+drainage%3B+a+parameterization+for+large-scale+modeling&rft.au=Turner%2C+Adrian+K%3BHunke%2C+Elizabeth+C%3BBitz%2C+Cecilia+M&rft.aulast=Turner&rft.aufirst=Adrian&rft.date=2013-05-01&rft.volume=118&rft.issue=5&rft.spage=2279&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research%3A+Oceans&rft.issn=21699275&rft_id=info:doi/10.1002%2Fjgrc.20171 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 40 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2015-02-19 N1 - SubjectsTermNotLitGenreText - experimental studies; ice; laboratory studies; models; permeability; porosity; Rayleigh number; salinity; sea ice; temperature; thermodynamic properties DO - http://dx.doi.org/10.1002/jgrc.20171 ER - TY - JOUR T1 - Extracting surface wave attenuation from seismic noise using correlation of the coda of correlation AN - 1438970828; 2013-077436 AB - Extracting surface wave travel time information from the cross-correlation (CC) of seismic ambient noise has been a great success and remains fast growing. However, it is still challenging to exploit the amplitude content of the noise CC. Although spatial average is able to constrain somewhat meaningful attenuation using noise CC amplitudes, clear bias is observed when spatially varying attenuation is estimated with the traditional noise CC calculation methods. Perhaps the key lies in the development of novel techniques that can mitigate the effect of the uneven distribution of natural noise sources. In this paper, we propose a new method to use the correlation of the coda of correlation of noise (C (super 3) ) for amplitude measurement. We examine the ability of the method to retrieve surface wave attenuation using data from selected line array stations of the USArray. By comparing C (super 3) -derived attenuation coefficients with those estimated from earthquake data, we demonstrate that C (super 3) effectively reduces bias and allows for more reliable attenuation estimates from noise. This is probably because of the fact that the coda of noise correlation contains more diffused noise energy, and thus, the C (super 3) processing effectively makes the noise source distribution more homogeneous. When selecting auxiliary stations for C (super 3) calculation, we find that stations closer to noise sources (near the coast) tend to yield better signal-to-noise ratios. We suggest to preprocess noise data using a transient removal and temporal flattening method, to mitigate the effect of temporal fluctuation of the noise source intensity, and to retain relative amplitudes. In this study, we focus our analysis on 18 s measurements. Abstract Copyright (2013), . American Geophysical Union. All Rights Reserved. JF - Journal of Geophysical Research: Solid Earth AU - Zhang, Jian AU - Yang, Xiaoning Y1 - 2013/05// PY - 2013 DA - May 2013 SP - 2191 EP - 2205 PB - Wiley-Blackwell for American Geophysical Union, Washington, DC VL - 118 IS - 5 SN - 2169-9313, 2169-9313 KW - United States KW - USArray KW - Southern California Seismic Network KW - guided waves KW - statistical analysis KW - coda waves KW - elastic waves KW - correlation KW - noise KW - California KW - spatial distribution KW - attenuation KW - mitigation KW - surface waves KW - Southern California KW - crosscorrelation KW - mathematical methods KW - traveltime KW - natural attenuation KW - seismic waves KW - seismic networks KW - earthquakes KW - arrays KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1438970828?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research%3A+Solid+Earth&rft.atitle=Extracting+surface+wave+attenuation+from+seismic+noise+using+correlation+of+the+coda+of+correlation&rft.au=Zhang%2C+Jian%3BYang%2C+Xiaoning&rft.aulast=Zhang&rft.aufirst=Jian&rft.date=2013-05-01&rft.volume=118&rft.issue=5&rft.spage=2191&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research%3A+Solid+Earth&rft.issn=21699313&rft_id=info:doi/10.1002%2Fjgrb.50186 L2 - http://onlineLibrary.wiley.com/journal/10.1002/%28ISSN%292169-9100 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 54 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2015-02-19 N1 - SubjectsTermNotLitGenreText - arrays; attenuation; California; coda waves; correlation; crosscorrelation; earthquakes; elastic waves; guided waves; mathematical methods; mitigation; natural attenuation; noise; seismic networks; seismic waves; Southern California; Southern California Seismic Network; spatial distribution; statistical analysis; surface waves; traveltime; United States; USArray DO - http://dx.doi.org/10.1002/jgrb.50186 ER - TY - JOUR T1 - On simulation and analysis of variable-rate pumping tests AN - 1366815010; 2013-046032 AB - Analytical solutions for constant-rate pumping tests are widely used to infer aquifer properties. In this note, we implement a methodology that approximates the time-varying pumping record as a series of segments with linearly varying pumping rates. We validate our approach using an analytical solution for a sinusoidally varying pumping test. We also apply our methodology to analyze synthetic test data and compare the results with those from a commonly used method where rate variations are represented by a series of constant-rate steps. Abstract Copyright (2012), , National Ground Water Association. JF - Ground Water AU - Mishra, Phoolendra Kumar AU - Vessilinov, Velimir AU - Gupta, Hoshin Y1 - 2013/05// PY - 2013 DA - May 2013 SP - 469 EP - 473 PB - Wiley-Blackwell on behalf of National Ground Water Association, Westerville, OH VL - 51 IS - 3 SN - 0017-467X, 0017-467X KW - numerical models KW - pumping KW - injection KW - rates KW - mathematical models KW - simulation KW - Laplace transformations KW - boundary conditions KW - ground water KW - aquifers KW - pump tests KW - drawdown KW - hydraulic conductivity KW - discharge KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1366815010?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Ground+Water&rft.atitle=On+simulation+and+analysis+of+variable-rate+pumping+tests&rft.au=Mishra%2C+Phoolendra+Kumar%3BVessilinov%2C+Velimir%3BGupta%2C+Hoshin&rft.aulast=Mishra&rft.aufirst=Phoolendra&rft.date=2013-05-01&rft.volume=51&rft.issue=3&rft.spage=469&rft.isbn=&rft.btitle=&rft.title=Ground+Water&rft.issn=0017467X&rft_id=info:doi/10.1111%2Fj.1745-6584.2012.00961.x L2 - http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1745-6584 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 17 N1 - PubXState - OH N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2016-10-25 N1 - CODEN - GRWAAP N1 - SubjectsTermNotLitGenreText - aquifers; boundary conditions; discharge; drawdown; ground water; hydraulic conductivity; injection; Laplace transformations; mathematical models; numerical models; pump tests; pumping; rates; simulation DO - http://dx.doi.org/10.1111/j.1745-6584.2012.00961.x ER - TY - JOUR T1 - Nearly finished genomes produced using gel microdroplet culturing reveal substantial intraspecies genomic diversity within the human microbiome AN - 1356929391; 18017565 AB - The majority of microbial genomic diversity remains unexplored. This is largely due to our inability to culture most microorganisms in isolation, which is a prerequisite for traditional genome sequencing. Single-cell sequencing has allowed researchers to circumvent this limitation. DNA is amplified directly from a single cell using the whole-genome amplification technique of multiple displacement amplification (MDA). However, MDA from a single chromosome copy suffers from amplification bias and a large loss of specificity from even very small amounts of DNA contamination, which makes assembling a genome difficult and completely finishing a genome impossible except in extraordinary circumstances. Gel microdrop cultivation allows culturing of a diverse microbial community and provides hundreds to thousands of genetically identical cells as input for an MDA reaction. We demonstrate the utility of this approach by comparing sequencing results of gel microdroplets and single cells following MDA. Bias is reduced in the MDA reaction and genome sequencing, and assembly is greatly improved when using gel microdroplets. We acquired multiple near-complete genomes for two bacterial species from human oral and stool microbiome samples. A significant amount of genome diversity, including single nucleotide polymorphisms and genome recombination, is discovered. Gel microdroplets offer a powerful and high-throughput technology for assembling whole genomes from complex samples and for probing the pan-genome of naturally occurring populations. JF - Genome Research AU - Fitzsimons AU - Novotny, M AU - Lo, C-C AU - Dichosa, AEK AU - Yee-Greenbaum, J L AU - Snook, J P AU - Gu, W AU - Chertkov, O AU - Davenport, K W AU - McMurry, K AU - Reitenga, K G AU - Daughton, A R AU - He, J AU - Johnson, S L AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA, Han_cliff@lanl.gov Y1 - 2013/05// PY - 2013 DA - May 2013 SP - 878 EP - 888 VL - 23 IS - 5 SN - 1088-9051, 1088-9051 KW - Genetics Abstracts; Biochemistry Abstracts 2: Nucleic Acids; Microbiology Abstracts A: Industrial & Applied Microbiology KW - Genomes KW - Recombination KW - Chromosomes KW - Contamination KW - Single-nucleotide polymorphism KW - DNA KW - Microorganisms KW - Cell culture KW - genomics KW - Feces KW - N 14845:Miscellaneous KW - G 07770:Bacteria KW - A 01300:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356929391?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologya&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Genome+Research&rft.atitle=Nearly+finished+genomes+produced+using+gel+microdroplet+culturing+reveal+substantial+intraspecies+genomic+diversity+within+the+human+microbiome&rft.au=Fitzsimons%3BNovotny%2C+M%3BLo%2C+C-C%3BDichosa%2C+AEK%3BYee-Greenbaum%2C+J+L%3BSnook%2C+J+P%3BGu%2C+W%3BChertkov%2C+O%3BDavenport%2C+K+W%3BMcMurry%2C+K%3BReitenga%2C+K+G%3BDaughton%2C+A+R%3BHe%2C+J%3BJohnson%2C+S+L&rft.aulast=Fitzsimons&rft.aufirst=&rft.date=2013-05-01&rft.volume=23&rft.issue=5&rft.spage=878&rft.isbn=&rft.btitle=&rft.title=Genome+Research&rft.issn=10889051&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-05-01 N1 - Last updated - 2016-02-04 N1 - SubjectsTermNotLitGenreText - Genomes; Recombination; Chromosomes; Contamination; Single-nucleotide polymorphism; Microorganisms; DNA; Cell culture; genomics; Feces ER - TY - JOUR T1 - Analysis of interval-censored data with random unknown end points: an application to soft error rate estimation AN - 1349395544; 4434638 AB - Summary. The paper presents a Bayesian approach to analysing interval-censored data with random unknown end points. Such data occur when the event of interest is interval censored but, because of the measurement process, the interval end points are not known exactly. Modelling the measurement process permits inference that accounts for this source of variability. Our results are motivated by an experimental study that was designed to characterize the cosmic-ray-neutron-induced soft error rate of a semiconductor device. Reprinted by permission of Blackwell Publishers JF - Journal of the Royal Statistical Society AU - Hamada, Michael S AU - Hengartner, Nicolas W AU - Michalak, Sarah E AD - Los Alamos National Laboratory Y1 - 2013/05// PY - 2013 DA - May 2013 SP - 473 EP - 486 VL - 62 IS - 3 SN - 0035-9254, 0035-9254 KW - Economics KW - Measurement KW - Random sampling KW - Electronic equipment KW - Error KW - Modelling KW - Bayesian method UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1349395544?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aibss&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+the+Royal+Statistical+Society&rft.atitle=Analysis+of+interval-censored+data+with+random+unknown+end+points%3A+an+application+to+soft+error+rate+estimation&rft.au=Hamada%2C+Michael+S%3BHengartner%2C+Nicolas+W%3BMichalak%2C+Sarah+E&rft.aulast=Hamada&rft.aufirst=Michael&rft.date=2013-05-01&rft.volume=62&rft.issue=3&rft.spage=473&rft.isbn=&rft.btitle=&rft.title=Journal+of+the+Royal+Statistical+Society&rft.issn=00359254&rft_id=info:doi/10.1111%2Frssc.12005 LA - English DB - International Bibliography of the Social Sciences (IBSS) N1 - Date revised - 2013-06-12 N1 - Last updated - 2013-09-16 N1 - SubjectsTermNotLitGenreText - 1512 3865 4025; 4387; 10606 11255 12228 10919; 4167 4379; 7854; 8162 8163 DO - http://dx.doi.org/10.1111/rssc.12005 ER - TY - JOUR T1 - Production of carbon-rich presolar grains from massive stars AN - 1739084416; 2015-116207 AB - About a year after core-collapse supernova, dust starts to condense in the ejecta. In meteorites, a fraction of C-rich presolar grains (e.g., silicon carbide (SiC) grains of Type-X and low density graphites) are identified as relics of these events, according to the anomalous isotopic abundances. Several features of these abundances remain unexplained and challenge the understanding of core-collapse supernovae explosions and nucleosynthesis. We show, for the first time, that most of the measured C-rich grain abundances can be accounted for in the C-rich material from explosive He burning in core-collapse supernovae with high shock velocities and consequent high temperatures. The inefficiency of the (super 12) C(alpha , gamma ) (super 16) O reaction relative to the rest of the alpha -capture chain at T > 3.5 X 10 (super 8) K causes the deepest He-shell material to be carbon-rich and silicon-rich, and depleted in oxygen. The isotopic ratio predictions in part of this material, defined here as the C/Si zone, are in agreement with the grain data. The high-temperature explosive conditions that our models reach at the bottom of the He shell can also be representative of the nucleosynthesis in hypernovae or in the high-temperature tail of a distribution of conditions in asymmetric supernovae. Finally, our predictions are consistent with the observation of large (super 44) Ca/ (super 40) Ca observed in the grains. This is due to the production of (super 44) Ti together with (super 40) Ca in the C/Si zone and/or to the strong depletion of (super 40) Ca by neutron captures. Copyright (Copyright) 2013. The American Astronomical Society. All rights reserved. JF - The Astrophysical Journal. Letters AU - Pignatari, M AU - Wiescher, M AU - Timmes, F X AU - de Boer, R J AU - Thielemann, F K AU - Fryer, C AU - Heger, A AU - Herwig, F AU - Hirschi, R Y1 - 2013/04/20/ PY - 2013 DA - 2013 Apr 20 EP - Paper no. L22 PB - IOP Publishing, Bristol VL - 767 IS - 2 SN - 2041-8205, 2041-8205 KW - calcium KW - isotopes KW - carbides KW - silicon KW - stable isotopes KW - temperature KW - nitrogen KW - meteorites KW - silicon carbide KW - presolar grains KW - noble gases KW - carbon KW - relict materials KW - helium KW - alloys KW - alkaline earth metals KW - N-15/N-14 KW - explosions KW - Si-29/Si-28 KW - isotope ratios KW - supernovas KW - C-13/C-12 KW - cosmochemistry KW - nucleosynthesis KW - native elements KW - models KW - graphite KW - Ca-44/Ca-40 KW - stars KW - metals KW - Si-30/Si-28 KW - high temperature KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1739084416?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Astrophysical+Journal.+Letters&rft.atitle=Production+of+carbon-rich+presolar+grains+from+massive+stars&rft.au=Pignatari%2C+M%3BWiescher%2C+M%3BTimmes%2C+F+X%3Bde+Boer%2C+R+J%3BThielemann%2C+F+K%3BFryer%2C+C%3BHeger%2C+A%3BHerwig%2C+F%3BHirschi%2C+R&rft.aulast=Pignatari&rft.aufirst=M&rft.date=2013-04-20&rft.volume=767&rft.issue=2&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+Astrophysical+Journal.+Letters&rft.issn=20418205&rft_id=info:doi/10.1088%2F2041-8205%2F767%2F2%2FL22 L2 - http://iopscience.iop.org/2041-8205 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2015-01-01 N1 - Number of references - 31 N1 - Document feature - illus. N1 - Last updated - 2015-12-04 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; alloys; C-13/C-12; Ca-44/Ca-40; calcium; carbides; carbon; cosmochemistry; explosions; graphite; helium; high temperature; isotope ratios; isotopes; metals; meteorites; models; N-15/N-14; native elements; nitrogen; noble gases; nucleosynthesis; presolar grains; relict materials; Si-29/Si-28; Si-30/Si-28; silicon; silicon carbide; stable isotopes; stars; supernovas; temperature DO - http://dx.doi.org/10.1088/2041-8205/767/2/L22 ER - TY - JOUR T1 - Micron scale intra-shell oxygen isotope variation in cultured planktic foraminifers AN - 1420515551; 2013-065099 AB - In this study, we show that the rate of shell precipitation in the extant planktic foraminifer Orbulina universa is sufficiently rapid that 12 h calcification periods in (super 18) O-labeled seawater can be resolved and accurately measured using secondary ion mass spectrometry (SIMS) for in situ delta (super 18) O analyses. Calcifying O. universa held at constant temperature (22 degrees C) were transferred every 12 h between ambient seawater (delta (super 18) O (sub w) =-0.4 ppm VSMOW) and seawater with enriched barium and delta (super 18) O (sub w) =+18.6 ppm VSMOW, to produce geochemically distinct layers of calcite, separated by calcite precipitated with an ambient geochemical signature. We quantify the position of the Ba-labeled calcite in the shell wall of O. universa via laser ablation ICP-MS depth profiling of trace element ratios, and then measure intrashell delta (super 18) O (sub calcite) in the same shells using SIMS with a 3mu m spot and an average precision of 0.6 ppm (+ or -2 SD). Measured delta (super 18) O (sub calcite) values in O. universa shell layers are within + or -1.1 ppm of predicted delta (super 18) O (sub calcite) values. Elemental and oxygen isotope data show that LA-ICP-MS and SIMS measurements can be cross-correlated within the spatial resolution of the two analytical techniques, and that delta (super 18) O (sub calcite) and elemental tracers appear to be precipitated synchronously with no measurable spatial offsets. These results demonstrate the capability of SIMS to resolve daily growth increments in foraminifer shells, and highlight its potential for paleoceanographic and biomineralization applications on microfossils. Abstract Copyright (2013) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Vetter, Lael AU - Kozdon, Reinhard AU - Mora, Claudia I AU - Eggins, Stephen M AU - Valley, John W AU - Hoenisch, Baerbel AU - Spero, Howard J Y1 - 2013/04/15/ PY - 2013 DA - 2013 Apr 15 SP - 267 EP - 278 PB - Elsevier, New York, NY VL - 107 SN - 0016-7037, 0016-7037 KW - sea water KW - oxygen KW - ion probe data KW - isotopes KW - mass spectra KW - Orbulina KW - Orbulina universa KW - stable isotopes KW - variations KW - temperature KW - Globigerinacea KW - Foraminifera KW - Globigerinidae KW - Invertebrata KW - spectra KW - chemical composition KW - biomineralization KW - shells KW - Protista KW - isotope ratios KW - Rotaliina KW - planktonic taxa KW - O-18/O-16 KW - calcite KW - ICP mass spectra KW - crystal chemistry KW - carbonates KW - microfossils KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1420515551?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Micron+scale+intra-shell+oxygen+isotope+variation+in+cultured+planktic+foraminifers&rft.au=Vetter%2C+Lael%3BKozdon%2C+Reinhard%3BMora%2C+Claudia+I%3BEggins%2C+Stephen+M%3BValley%2C+John+W%3BHoenisch%2C+Baerbel%3BSpero%2C+Howard+J&rft.aulast=Vetter&rft.aufirst=Lael&rft.date=2013-04-15&rft.volume=107&rft.issue=&rft.spage=267&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2012.12.046 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 100 N1 - PubXState - NY N1 - Document feature - illus. incl. 3 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-08-15 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - biomineralization; calcite; carbonates; chemical composition; crystal chemistry; Foraminifera; Globigerinacea; Globigerinidae; ICP mass spectra; Invertebrata; ion probe data; isotope ratios; isotopes; mass spectra; microfossils; O-18/O-16; Orbulina; Orbulina universa; oxygen; planktonic taxa; Protista; Rotaliina; sea water; shells; spectra; stable isotopes; temperature; variations DO - http://dx.doi.org/10.1016/j.gca.2012.12.046 ER - TY - JOUR T1 - Long-term changes of earthquake inter-event times and low-frequency earthquake recurrence in Central California AN - 1420508154; 2013-063159 AB - The temporal evolution of earthquake inter-event time (IET) may provide important clues for the timing of future events and underlying physical mechanisms of earthquake interaction. In this study, we examine approximately 12 yr of local earthquake and low-frequency earthquake (LFE) activity near Parkfield, CA from catalogs of approximately 50,000 earthquakes and approximately 730,000 LFEs. We focus on the long-term evolution of IETs after the 2003 Mw6.5 San Simeon and 2004 Mw6.0 Parkfield earthquakes. The IETs of local earthquakes along and to the southwest of the San Andreas fault show clear decreases of several orders of magnitude after the Parkfield and San Simeon earthquakes, followed by recoveries with time scales of approximately 3 yr and >8yr, respectively. We also observe decreases in recurrence times in some of LFE families, followed by long-term recoveries with time scales of approximately 4 months to several years. The long-term recovery of the earthquake IET is a manifestation of the aftershock decay of the Parkfield and San Simeon earthquakes, and the different recovery time scales likely reflect the different tectonic loading rates in the two regions. The drop in the recurrence times of LFEs after the Parkfield earthquake is likely caused by static and dynamic stresses induced by the Parkfield earthquake, and the long-term recovery in LFE recurrence time could be due to post-seismic relaxation or gradual recovery of fault zone material properties. The recovery time scales for general earthquake IET and LFE recurrence following the Parkfield earthquake are similar to those estimated for repeating earthquake recurrence identified in previous studies, indicating that they could be controlled by similar mechanisms. Abstract Copyright (2013) Elsevier, B.V. JF - Earth and Planetary Science Letters AU - Wu, Chunquan AU - Shelly, David R AU - Gomberg, Joan AU - Peng, Zhigang AU - Johnson, Paul Y1 - 2013/04/15/ PY - 2013 DA - 2013 Apr 15 SP - 144 EP - 150 PB - Elsevier, Amsterdam VL - 368 SN - 0012-821X, 0012-821X KW - United States KW - Parkfield earthquakes KW - loading KW - Central California KW - stress KW - frequency KW - San Simeon earthquake 2003 KW - California KW - Parkfield earthquake 2004 KW - recurrence interval KW - San Andreas Fault KW - Monterey County California KW - Parkfield California KW - temporal distribution KW - earthquakes KW - faults KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1420508154?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Earth+and+Planetary+Science+Letters&rft.atitle=Long-term+changes+of+earthquake+inter-event+times+and+low-frequency+earthquake+recurrence+in+Central+California&rft.au=Wu%2C+Chunquan%3BShelly%2C+David+R%3BGomberg%2C+Joan%3BPeng%2C+Zhigang%3BJohnson%2C+Paul&rft.aulast=Wu&rft.aufirst=Chunquan&rft.date=2013-04-15&rft.volume=368&rft.issue=&rft.spage=144&rft.isbn=&rft.btitle=&rft.title=Earth+and+Planetary+Science+Letters&rft.issn=0012821X&rft_id=info:doi/10.1016%2Fj.epsl.2013.03.007 L2 - http://www.sciencedirect.com/science/journal/0012821X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 45 N1 - Document feature - illus. incl. sketch map N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2013-08-15 N1 - CODEN - EPSLA2 N1 - SubjectsTermNotLitGenreText - California; Central California; earthquakes; faults; frequency; loading; Monterey County California; Parkfield California; Parkfield earthquake 2004; Parkfield earthquakes; recurrence interval; San Andreas Fault; San Simeon earthquake 2003; stress; temporal distribution; United States DO - http://dx.doi.org/10.1016/j.epsl.2013.03.007 ER - TY - JOUR T1 - Calculation of resident groundwater concentration by post-processing particle-tracking results AN - 1832582855; 669161-1 AB - A post-processing technique that allows relatively simple random walk particle-tracking results to be extrapolated to transport scenarios of considerably more complexity has traditionally been used to calculate flux at specified monitoring locations. Previous extensions of the post-processing approach to calculate resident groundwater concentrations could not disentangle concentrations of mobile and immobile mass in dual-porosity systems, which limited their utility. A variant of the post-processing method that allows for the calculation of resident concentrations of mobile and immobile mass is introduced and tested. The resulting combination of methods-random walk particle tracking without retention processes followed by post-processing to add the effects of retention-is a powerful and practical strategy for assessing the transport of radionuclides or other contaminants in field-scale applications. Copyright 2013 Springer Science+Business Media Dordrecht and 2012 Springer Science+Business Media Dordrecht (outside the USA) JF - Computational Geosciences AU - Painter, Scott L AU - Robinson, Bruce A AU - Dash, Zora V Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 189 EP - 196 PB - Springer, Dordrecht VL - 17 IS - 2 SN - 1420-0597, 1420-0597 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832582855?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computational+Geosciences&rft.atitle=Calculation+of+resident+groundwater+concentration+by+post-processing+particle-tracking+results&rft.au=Painter%2C+Scott+L%3BRobinson%2C+Bruce+A%3BDash%2C+Zora+V&rft.aulast=Painter&rft.aufirst=Scott&rft.date=2013-04-01&rft.volume=17&rft.issue=2&rft.spage=189&rft.isbn=&rft.btitle=&rft.title=Computational+Geosciences&rft.issn=14200597&rft_id=info:doi/10.1007%2Fs10596-012-9325-z L2 - http://www.springerlink.com/content/101744/ LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 DO - http://dx.doi.org/10.1007/s10596-012-9325-z ER - TY - JOUR T1 - Peak stress intensity factor governs crack propagation velocity in crosslinked ultrahigh-molecular-weight polyethylene AN - 1664201220; PQ0001233795 AB - Ultrahigh-molecular-weight polyethylene (UHMWPE) has been successfully used as a bearing material in total joint replacement components. However, these bearing materials can fail as a result of in vivo static and cyclic loads. Crack propagation behavior in this material has been considered using the Paris relationship which relates fatigue crack growth rate, da/dN (mm/cycle) versus the stress intensity factor range, Delta K (K sub(max) - K sub(min), MPa[radic]m). However, recent work suggests that the crack propagation velocity of conventional UHMWPE is driven by the peak stress intensity (K sub(max)), not Delta K. The hypothesis of this study is that the crack propagation velocity of highly crosslinked and remelted UHMWPE is also driven by the peak stress intensity, K sub(max), during cyclic loading. To test this hypothesis, two highly crosslinked (65 kGy and 100 kGy) and remelted UHMWPE materials were examined. Frequency, waveform, and R-ratio were varied between test conditions to determine the governing factor for fatigue crack propagation. It was found that the crack propagation velocity in crosslinked UHMWPE is also driven by K sub(max) and not Delta K, and is dependent on loading waveform and frequency in a predictable quasistatic manner. This study supports that crack growth in crosslinked UHMWPE materials, even under cyclic loading conditions, can be described by a relationship between the velocity of crack growth, da/dt and the peak stress intensity, K sub(max). The findings suggest that stable crack propagation can occur as a result of static loading only and this should be taken into consideration in design of UHMWPE total joint replacement components. copyright 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 101B: 430-435, 2013. JF - Journal of Biomedical Materials Research, Part B: Applied Biomaterials AU - Sirimamilla, Abhiram AU - Furmanski, Jevan AU - Rimnac, Clare AD - Structure-Property Relations Group, Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico., Clare.Rimnac@case.edu Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 430 EP - 435 PB - Wiley-Blackwell VL - 101B IS - 3 SN - 1552-4973, 1552-4973 KW - Biotechnology and Bioengineering Abstracts KW - Growth rate KW - Fatigue KW - Polyethylene KW - Stress KW - Joints KW - W 30920:Tissue Engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664201220?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Biomedical+Materials+Research%2C+Part+B%3A+Applied+Biomaterials&rft.atitle=Peak+stress+intensity+factor+governs+crack+propagation+velocity+in+crosslinked+ultrahigh-molecular-weight+polyethylene&rft.au=Sirimamilla%2C+Abhiram%3BFurmanski%2C+Jevan%3BRimnac%2C+Clare&rft.aulast=Sirimamilla&rft.aufirst=Abhiram&rft.date=2013-04-01&rft.volume=101B&rft.issue=3&rft.spage=430&rft.isbn=&rft.btitle=&rft.title=Journal+of+Biomedical+Materials+Research%2C+Part+B%3A+Applied+Biomaterials&rft.issn=15524973&rft_id=info:doi/10.1002%2Fjbm.b.32850 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-03-01 N1 - Last updated - 2016-04-13 N1 - SubjectsTermNotLitGenreText - Growth rate; Fatigue; Polyethylene; Stress; Joints DO - http://dx.doi.org/10.1002/jbm.b.32850 ER - TY - JOUR T1 - A three-dimensional eddy census of a high-resolution global ocean simulation AN - 1442374628; 2013-081476 AB - A three-dimensional eddy census data set was obtained from a global ocean simulation with one-tenth degree resolution and a duration of 7 years. The census includes 6.7 million eddies in daily data, which comprise 152,000 eddies tracked over their lifetimes, using a minimum lifetime cutoff of 28 days. Variables of interest include eddy diameter, thickness (vertical extent), minimum and maximum depth, location, rotational direction, lifetime, and translational speed. Distributions of these traits show a predominance of small, thin, short-lived, and slow eddies. Still, a significant number of eddies possess traits at the opposite extreme; thousands of eddies larger than 200 km in diameter appeared in daily data each year. A tracking algorithm found hundreds of eddies with lifetimes longer than 200 days. A third of the eddies are at least 1000 m tall and many penetrate the full depth of the water column. The Antarctic Circumpolar Current contains the thickest and highest density of eddies. Thick eddies are also common in the Gulf Stream, Kuroshio Current, and Agulhas ring pathway. The great majority of eddies extend all the way to the surface, confirming that eddy censuses from surface observations are a good proxy for the full-depth ocean. Correlations between variables show that larger-diameter eddies tend to be thicker and longer lived than small eddies. Abstract Copyright (2013), American Geophysical Union. All Rights Reserved. JF - Journal of Geophysical Research: Oceans AU - Petersen, Mark R AU - Williams, Sean J AU - Maltrud, Mathew E AU - Hecht, Matthew W AU - Hamann, Bernd Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 1759 EP - 1774 PB - Wiley-Blackwell for American Geophysical Union, Washington, DC VL - 118 IS - 4 SN - 2169-9275, 2169-9275 KW - ocean circulation KW - numerical models KW - three-dimensional models KW - statistical analysis KW - Parallel Ocean Program model KW - spatial distribution KW - multivariate analysis KW - eddies KW - digital simulation KW - velocity KW - algorithms KW - world ocean KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442374628?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research%3A+Oceans&rft.atitle=A+three-dimensional+eddy+census+of+a+high-resolution+global+ocean+simulation&rft.au=Petersen%2C+Mark+R%3BWilliams%2C+Sean+J%3BMaltrud%2C+Mathew+E%3BHecht%2C+Matthew+W%3BHamann%2C+Bernd&rft.aulast=Petersen&rft.aufirst=Mark&rft.date=2013-04-01&rft.volume=118&rft.issue=4&rft.spage=1759&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research%3A+Oceans&rft.issn=21699275&rft_id=info:doi/10.1002%2Fjgrc.20155 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 56 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2015-02-19 N1 - SubjectsTermNotLitGenreText - algorithms; digital simulation; eddies; multivariate analysis; numerical models; ocean circulation; Parallel Ocean Program model; spatial distribution; statistical analysis; three-dimensional models; velocity; world ocean DO - http://dx.doi.org/10.1002/jgrc.20155 ER - TY - JOUR T1 - Design and implementation of a multi-layer infrasound sensor array for the study of microbaroms AN - 1416691361; 2013-058876 JF - Seismological Research Letters AU - Marcillo, O AU - Arrowsmith, S J AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 343 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - technology KW - velocity KW - propagation KW - infrasound KW - frequency KW - winds KW - instruments KW - design KW - arrays KW - acoustical waves KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416691361?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Design+and+implementation+of+a+multi-layer+infrasound+sensor+array+for+the+study+of+microbaroms&rft.au=Marcillo%2C+O%3BArrowsmith%2C+S+J%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Marcillo&rft.aufirst=O&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=343&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - acoustical waves; arrays; design; frequency; infrasound; instruments; propagation; technology; velocity; winds ER - TY - JOUR T1 - Can teleseismic mb be affected by rock damage around explosions? AN - 1416691201; 2013-058694 JF - Seismological Research Letters AU - Taylor, S R AU - Patton, H J AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 306 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - P-waves KW - body waves KW - Far East KW - explosions KW - damage KW - North Korea KW - elastic waves KW - effects KW - seismic sources KW - Korea KW - seismic response KW - teleseismic signals KW - depth KW - seismicity KW - propagation KW - seismic waves KW - Asia KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416691201?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Can+teleseismic+mb+be+affected+by+rock+damage+around+explosions%3F&rft.au=Taylor%2C+S+R%3BPatton%2C+H+J%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Taylor&rft.aufirst=S&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=306&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - Asia; body waves; damage; depth; effects; elastic waves; explosions; Far East; Korea; North Korea; P-waves; propagation; seismic response; seismic sources; seismic waves; seismicity; teleseismic signals ER - TY - JOUR T1 - Assessment of seismic design static displacement for a critical facility located near a major normal fault AN - 1416691131; 2013-060742 JF - Seismological Research Letters AU - Larmat, C S AU - Lee, R C AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 377 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - North America KW - geologic hazards KW - magnitude KW - radar methods KW - Europe KW - Italy KW - Southern Europe KW - Rio Grande Rift KW - strong motion KW - L'Aquila earthquake 2009 KW - seismicity KW - SAR KW - normal faults KW - seismic risk KW - natural hazards KW - ground motion KW - risk assessment KW - Pajarito Fault KW - InSAR KW - earthquakes KW - faults KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416691131?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Assessment+of+seismic+design+static+displacement+for+a+critical+facility+located+near+a+major+normal+fault&rft.au=Larmat%2C+C+S%3BLee%2C+R+C%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Larmat&rft.aufirst=C&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=377&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - earthquakes; Europe; faults; geologic hazards; ground motion; InSAR; Italy; L'Aquila earthquake 2009; magnitude; natural hazards; normal faults; North America; Pajarito Fault; radar methods; Rio Grande Rift; risk assessment; SAR; seismic risk; seismicity; Southern Europe; strong motion ER - TY - JOUR T1 - Southwest U.S. Seismo-Acoustic Network; an autonomous data aggregation, detection, localization and ground-truth bulletin for the infrasound community AN - 1416690850; 2013-058700 JF - Seismological Research Letters AU - Jones, K R AU - Arrowsmith, S J AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 307 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - technology KW - ground truth KW - seismicity KW - infrasound KW - seismic networks KW - instruments KW - arrays KW - acoustical waves KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416690850?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Southwest+U.S.+Seismo-Acoustic+Network%3B+an+autonomous+data+aggregation%2C+detection%2C+localization+and+ground-truth+bulletin+for+the+infrasound+community&rft.au=Jones%2C+K+R%3BArrowsmith%2C+S+J%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Jones&rft.aufirst=K&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=307&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - acoustical waves; arrays; ground truth; infrasound; instruments; seismic networks; seismicity; technology ER - TY - JOUR T1 - Dynamic and delayed triggering of moderate-size earthquakes in east Asia AN - 1416690797; 2013-060718 JF - Seismological Research Letters AU - Peng, Z AU - Wu, C AU - Yao, D AU - Meng, X AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 372 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - Zhongba China KW - precursors KW - Taiwan KW - Far East KW - seismicity KW - magnitude KW - Asia KW - earthquakes KW - faults KW - China KW - signals KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416690797?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Dynamic+and+delayed+triggering+of+moderate-size+earthquakes+in+east+Asia&rft.au=Peng%2C+Z%3BWu%2C+C%3BYao%2C+D%3BMeng%2C+X%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Peng&rft.aufirst=Z&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=372&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - Asia; China; earthquakes; Far East; faults; magnitude; precursors; seismicity; signals; Taiwan; Zhongba China ER - TY - JOUR T1 - Reduced displacement potentials from SPE free field measurements and their comparison with empirical explosion models AN - 1416690583; 2013-058686 JF - Seismological Research Letters AU - Rougier, E AU - Patton, H J AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 304 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - models KW - attenuation KW - plutonic rocks KW - explosions KW - igneous rocks KW - granites KW - acceleration KW - propagation KW - seismic energy KW - seismic response KW - earthquakes KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416690583?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Reduced+displacement+potentials+from+SPE+free+field+measurements+and+their+comparison+with+empirical+explosion+models&rft.au=Rougier%2C+E%3BPatton%2C+H+J%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Rougier&rft.aufirst=E&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=304&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - acceleration; attenuation; earthquakes; explosions; granites; igneous rocks; models; plutonic rocks; propagation; seismic energy; seismic response ER - TY - JOUR T1 - SPE-2; free surface damage analysis via a novel visco-plastic continuum model for geomaterials in loading extremes AN - 1416690063; 2013-058693 JF - Seismological Research Letters AU - Zubelewicz, A AU - Rougier, E AU - Knight, E E AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 306 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - experimental studies KW - explosions KW - loading KW - igneous rocks KW - granites KW - damage KW - acceleration KW - depth KW - models KW - fractures KW - plutonic rocks KW - seismicity KW - propagation KW - seismic energy KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416690063?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=SPE-2%3B+free+surface+damage+analysis+via+a+novel+visco-plastic+continuum+model+for+geomaterials+in+loading+extremes&rft.au=Zubelewicz%2C+A%3BRougier%2C+E%3BKnight%2C+E+E%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Zubelewicz&rft.aufirst=A&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=306&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - acceleration; damage; depth; experimental studies; explosions; fractures; granites; igneous rocks; loading; models; plutonic rocks; propagation; seismic energy; seismicity ER - TY - JOUR T1 - Combined Rayleigh- and Love-wave magnitudes for seismic event discrimination and screening analysis AN - 1416689671; 2013-060622 JF - Seismological Research Letters AU - MacCarthy, J K AU - Gonner, J L AU - Anderson, D N AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 352 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - Far East KW - discriminant analysis KW - guided waves KW - explosions KW - shallow-focus earthquakes KW - statistical analysis KW - magnitude KW - North Korea KW - elastic waves KW - seismic sources KW - Korea KW - seismic response KW - Rayleigh waves KW - surface waves KW - Love waves KW - seismic waves KW - nuclear explosions KW - Asia KW - earthquakes KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416689671?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Combined+Rayleigh-+and+Love-wave+magnitudes+for+seismic+event+discrimination+and+screening+analysis&rft.au=MacCarthy%2C+J+K%3BGonner%2C+J+L%3BAnderson%2C+D+N%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=MacCarthy&rft.aufirst=J&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=352&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - Asia; discriminant analysis; earthquakes; elastic waves; explosions; Far East; guided waves; Korea; Love waves; magnitude; North Korea; nuclear explosions; Rayleigh waves; seismic response; seismic sources; seismic waves; shallow-focus earthquakes; statistical analysis; surface waves ER - TY - JOUR T1 - Ambient noise tomography of surface-wave attenuation using the USArray AN - 1416689663; 2013-058628 JF - Seismological Research Letters AU - Zhang, J AU - Yang, X AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 292 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - tomography KW - USArray KW - focal mechanism KW - technology KW - guided waves KW - statistical analysis KW - Green function KW - elastic waves KW - noise KW - attenuation KW - surface waves KW - crosscorrelation KW - propagation KW - seismic waves KW - earthquakes KW - amplitude KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416689663?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Ambient+noise+tomography+of+surface-wave+attenuation+using+the+USArray&rft.au=Zhang%2C+J%3BYang%2C+X%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Zhang&rft.aufirst=J&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=292&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - amplitude; attenuation; crosscorrelation; earthquakes; elastic waves; focal mechanism; Green function; guided waves; noise; propagation; seismic waves; statistical analysis; surface waves; technology; tomography; USArray ER - TY - JOUR T1 - SPE-2; free surface damage analysis via a FDEM geophysics code AN - 1416689431; 2013-060620 JF - Seismological Research Letters AU - Rougier, E AU - Knight, E E AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 352 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - body waves KW - experimental studies KW - explosions KW - igneous rocks KW - chemical explosions KW - granites KW - acceleration KW - elastic waves KW - seismic sources KW - seismic response KW - depth KW - signals KW - plutonic rocks KW - propagation KW - seismic waves KW - S-waves KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416689431?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=SPE-2%3B+free+surface+damage+analysis+via+a+FDEM+geophysics+code&rft.au=Rougier%2C+E%3BKnight%2C+E+E%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Rougier&rft.aufirst=E&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=352&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - acceleration; body waves; chemical explosions; depth; elastic waves; experimental studies; explosions; granites; igneous rocks; plutonic rocks; propagation; S-waves; seismic response; seismic sources; seismic waves; signals ER - TY - JOUR T1 - Multivariate acoustic detection of small explosions using Fisher's Combined Probability Test AN - 1416689317; 2013-058701 JF - Seismological Research Letters AU - Taylor, S R AU - Arrowsmith, S J AU - Anderson, D N AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 307 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - detection KW - seismicity KW - multivariate analysis KW - explosions KW - statistical analysis KW - Fisher's Combined Probability Test KW - probability KW - acoustical waves KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416689317?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Multivariate+acoustic+detection+of+small+explosions+using+Fisher%27s+Combined+Probability+Test&rft.au=Taylor%2C+S+R%3BArrowsmith%2C+S+J%3BAnderson%2C+D+N%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Taylor&rft.aufirst=S&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=307&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - acoustical waves; detection; explosions; Fisher's Combined Probability Test; multivariate analysis; probability; seismicity; statistical analysis ER - TY - JOUR T1 - Non-accelerating foreshock activity of the 1999 Mw7.1 Duzce, Turkey earthquake AN - 1416689278; 2013-060629 JF - Seismological Research Letters AU - Wu, C AU - Peng, Z AU - Ben-Zion, Y AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 354 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - seismicity KW - Duzce earthquake 1999 KW - magnitude KW - Turkey KW - epicenters KW - Asia KW - earthquakes KW - Middle East KW - faults KW - foreshocks KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416689278?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Non-accelerating+foreshock+activity+of+the+1999+Mw7.1+Duzce%2C+Turkey+earthquake&rft.au=Wu%2C+C%3BPeng%2C+Z%3BBen-Zion%2C+Y%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Wu&rft.aufirst=C&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=354&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - Asia; Duzce earthquake 1999; earthquakes; epicenters; faults; foreshocks; magnitude; Middle East; seismicity; Turkey ER - TY - JOUR T1 - Multiple-frequency detection; method and application to Utah infrasound data AN - 1416689275; 2013-058875 JF - Seismological Research Letters AU - Arrowsmith, S J AU - Huang, Z AU - Burlacu, R AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 343 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - United States KW - technology KW - detection KW - seismicity KW - Utah KW - infrasound KW - frequency KW - instruments KW - arrays KW - acoustical waves KW - signals KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416689275?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Multiple-frequency+detection%3B+method+and+application+to+Utah+infrasound+data&rft.au=Arrowsmith%2C+S+J%3BHuang%2C+Z%3BBurlacu%2C+R%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Arrowsmith&rft.aufirst=S&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=343&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - acoustical waves; arrays; detection; frequency; infrasound; instruments; seismicity; signals; technology; United States; Utah ER - TY - JOUR T1 - Wave speed and attenuation of seismic waves through Earth structures on or near climax stock using data from the source physics experiment AN - 1416689032; 2013-060616 JF - Seismological Research Letters AU - Larmat, C S AU - Rowe, C A AU - Patton, H J AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 351 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - attenuation KW - experimental studies KW - explosions KW - propagation KW - mechanical properties KW - elastic waves KW - waveforms KW - seismic waves KW - arrival time KW - seismic response KW - depth KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416689032?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Wave+speed+and+attenuation+of+seismic+waves+through+Earth+structures+on+or+near+climax+stock+using+data+from+the+source+physics+experiment&rft.au=Larmat%2C+C+S%3BRowe%2C+C+A%3BPatton%2C+H+J%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Larmat&rft.aufirst=C&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=351&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - arrival time; attenuation; depth; elastic waves; experimental studies; explosions; mechanical properties; propagation; seismic response; seismic waves; waveforms ER - TY - JOUR T1 - Moment tensor inversion of spatially and temporally distributed sources involved in an underground explosion AN - 1416688856; 2013-060618 JF - Seismological Research Letters AU - Yang, X AU - Patton, H J AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 351 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - moment tensors KW - explosions KW - stress KW - seismic sources KW - seismic response KW - spallation KW - depth KW - noise KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416688856?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Moment+tensor+inversion+of+spatially+and+temporally+distributed+sources+involved+in+an+underground+explosion&rft.au=Yang%2C+X%3BPatton%2C+H+J%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Yang&rft.aufirst=X&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=351&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - depth; explosions; moment tensors; noise; seismic response; seismic sources; spallation; stress ER - TY - JOUR T1 - Probing local wind and temperature structure using infrasound from Volcan Villarrica (Chile) AN - 1416687081; 2013-058696 JF - Seismological Research Letters AU - Johnson, Jeffrey B AU - Anderson, J F AU - Marcillo, O AU - Arrowsmith, S J AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 306 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - Andes KW - plumes KW - waves KW - atmosphere KW - effects KW - Chile KW - Villarrica KW - models KW - South America KW - seismicity KW - eruptions KW - volcanoes KW - velocity KW - propagation KW - winds KW - arrays KW - acoustical waves KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416687081?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Probing+local+wind+and+temperature+structure+using+infrasound+from+Volcan+Villarrica+%28Chile%29&rft.au=Johnson%2C+Jeffrey+B%3BAnderson%2C+J+F%3BMarcillo%2C+O%3BArrowsmith%2C+S+J%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Johnson&rft.aufirst=Jeffrey&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=306&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - acoustical waves; Andes; arrays; atmosphere; Chile; effects; eruptions; models; plumes; propagation; seismicity; South America; velocity; Villarrica; volcanoes; waves; winds ER - TY - JOUR T1 - A comparative study of automated and analyst infrasound detections using PMCC and InfraMonitor AN - 1416685937; 2013-058872 JF - Seismological Research Letters AU - Park, J AU - Hayward, C T AU - Zeiler, C P AU - Arrowsmith, S J AU - Stump, B W AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 342 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - technology KW - geologic hazards KW - statistical analysis KW - noise KW - detection KW - seismic risk KW - natural hazards KW - risk assessment KW - probability KW - seismic networks KW - earthquakes KW - instruments KW - arrays KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416685937?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=A+comparative+study+of+automated+and+analyst+infrasound+detections+using+PMCC+and+InfraMonitor&rft.au=Park%2C+J%3BHayward%2C+C+T%3BZeiler%2C+C+P%3BArrowsmith%2C+S+J%3BStump%2C+B+W%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Park&rft.aufirst=J&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=342&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - arrays; detection; earthquakes; geologic hazards; instruments; natural hazards; noise; probability; risk assessment; seismic networks; seismic risk; statistical analysis; technology ER - TY - JOUR T1 - Global trends in ocean wave state and extremal storm events through microseism analysis AN - 1416685642; 2013-058866 JF - Seismological Research Letters AU - Anthony, R E AU - Aster, R C AU - Rowe, C AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 341 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - ocean circulation KW - geologic hazards KW - guided waves KW - global KW - elastic waves KW - effects KW - Rayleigh waves KW - variations KW - noise KW - El Nino Southern Oscillation KW - surface waves KW - seismicity KW - ocean waves KW - natural hazards KW - storms KW - seismic waves KW - microearthquakes KW - earthquakes KW - 19:Seismology KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416685642?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Global+trends+in+ocean+wave+state+and+extremal+storm+events+through+microseism+analysis&rft.au=Anthony%2C+R+E%3BAster%2C+R+C%3BRowe%2C+C%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Anthony&rft.aufirst=R&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=341&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - earthquakes; effects; El Nino Southern Oscillation; elastic waves; geologic hazards; global; guided waves; microearthquakes; natural hazards; noise; ocean circulation; ocean waves; Rayleigh waves; seismic waves; seismicity; storms; surface waves; variations ER - TY - JOUR T1 - Source phenomenology and parameters of small chemical explosions; contrasting shots of the 1997 Kazakhstan depth of burial and ongoing source physics experiments AN - 1416684850; 2013-058692 JF - Seismological Research Letters AU - Patton, H J AU - Larmat, C AU - Koper, Keith AU - Wong, Ivan Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 306 PB - Seismological Society of America, El Cerrito, CA VL - 84 IS - 2 SN - 0895-0695, 0895-0695 KW - P-waves KW - body waves KW - experimental studies KW - guided waves KW - explosions KW - chemical explosions KW - elastic waves KW - short-period waves KW - Balapan Kazakhstan KW - seismic sources KW - Rayleigh waves KW - depth KW - Central Asia KW - signals KW - surface waves KW - Commonwealth of Independent States KW - Rg-waves KW - Kazakhstan KW - seismic waves KW - Asia KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1416684850?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Source+phenomenology+and+parameters+of+small+chemical+explosions%3B+contrasting+shots+of+the+1997+Kazakhstan+depth+of+burial+and+ongoing+source+physics+experiments&rft.au=Patton%2C+H+J%3BLarmat%2C+C%3BKoper%2C+Keith%3BWong%2C+Ivan&rft.aulast=Patton&rft.aufirst=H&rft.date=2013-04-01&rft.volume=84&rft.issue=2&rft.spage=306&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - Asia; Balapan Kazakhstan; body waves; Central Asia; chemical explosions; Commonwealth of Independent States; depth; elastic waves; experimental studies; explosions; guided waves; Kazakhstan; P-waves; Rayleigh waves; Rg-waves; seismic sources; seismic waves; short-period waves; signals; surface waves ER - TY - JOUR T1 - Three-dimensional finite-element modeling of fault interactions in rift-scale normal fault systems; implications for the late Cenozoic Rio Grande Rift of north-central New Mexico AN - 1371762452; 2013-049657 AB - The late Cenozoic extension in the Rio Grande rift of north-central New Mexico was predominantly accommodated by the north-south-trending Pajarito and Sangre de Cristo normal faults and the intervening east-northeast-striking predominantly strike-slip Embudo fault. Using this segment of the rift as our primary example, we have analyzed a series of three-dimensional nonlinear elastic-plastic finite-element models to assess the role of mechanical interactions between pairs of en echelon rift-scale listric normal faults in the evolution of intervening relay zones. The model results demonstrate that under orthogonal extension and an overall plane-strain deformation, relay zones may evolve in a three-dimensional strain field and along non-coaxial strain paths. The extent of non-plane strain and non-coaxial deformation depends on the fault overlap to spacing ratio, the relative orientations of the bounding faults, and the structural position within the relay zone. The model-derived minimum compressive stress vectors within the relay zone are oblique to the regional extension direction throughout the deformation. Within the Rio Grande rift of north-central New Mexico, the occurrence of northerly striking Neogene faults suggestive of east-west extension in the Espanola and the San Luis Basins, geographic variations in the vertical-axis rotations from paleomagnetic studies, and secondary fault patterns are consistent with the near-surface variations in the strain field predicted by the model. The model suggests that interaction between the Pajarito and the Sangre de Cristo faults may have played a major role in the evolution of this segment of the rift. JF - Special Paper - Geological Society of America AU - Goteti, Rajesh AU - Mitra, Gautam AU - Becene, Ahmet AU - Sussman, Aviva AU - Lewis, Claudia Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 157 EP - 184 PB - Geological Society of America (GSA), Boulder, CO VL - 494 SN - 0072-1077, 0072-1077 KW - United States KW - en echelon faults KW - strain KW - New Mexico KW - displacements KW - rifting KW - Rio Grande Rift KW - Cenozoic KW - finite element analysis KW - Embudo Fault KW - San Luis Valley KW - normal faults KW - Pajarito Fault KW - faults KW - North America KW - upper Cenozoic KW - numerical models KW - three-dimensional models KW - rift zones KW - listric faults KW - landform evolution KW - stress KW - paleomagnetism KW - deformation KW - extension KW - Tertiary KW - Neogene KW - Sangre de Cristo Fault KW - ramps KW - fault zones KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1371762452?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Special+Paper+-+Geological+Society+of+America&rft.atitle=Three-dimensional+finite-element+modeling+of+fault+interactions+in+rift-scale+normal+fault+systems%3B+implications+for+the+late+Cenozoic+Rio+Grande+Rift+of+north-central+New+Mexico&rft.au=Goteti%2C+Rajesh%3BMitra%2C+Gautam%3BBecene%2C+Ahmet%3BSussman%2C+Aviva%3BLewis%2C+Claudia&rft.aulast=Goteti&rft.aufirst=Rajesh&rft.date=2013-04-01&rft.volume=494&rft.issue=&rft.spage=157&rft.isbn=&rft.btitle=&rft.title=Special+Paper+-+Geological+Society+of+America&rft.issn=00721077&rft_id=info:doi/10.1130%2F2013.2494%2807%29 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 114 N1 - PubXState - CO N1 - Document feature - illus. incl. block diags., geol. sketch map N1 - Last updated - 2013-06-27 N1 - CODEN - GSAPAZ N1 - SubjectsTermNotLitGenreText - Cenozoic; deformation; displacements; Embudo Fault; en echelon faults; extension; fault zones; faults; finite element analysis; landform evolution; listric faults; Neogene; New Mexico; normal faults; North America; numerical models; Pajarito Fault; paleomagnetism; ramps; rift zones; rifting; Rio Grande Rift; San Luis Valley; Sangre de Cristo Fault; strain; stress; Tertiary; three-dimensional models; United States; upper Cenozoic DO - http://dx.doi.org/10.1130/2013.2494(07) ER - TY - JOUR T1 - Chronology of volcanism, tectonics, and sedimentation near the western boundary fault of the Espanola Basin, Rio Grande Rift, New Mexico AN - 1371762041; 2013-049659 AB - New (super 40) Ar/ (super 39) Ar results from drill-hole cuttings of basaltic and basaltic andesite flows from the Guaje well field of the Pajarito Plateau along the western part of the Espanola Basin in north-central New Mexico yielded Middle Miocene ages (11.5-13.2 Ma). The volcanic eruptions were closely associated with intense faulting, subsidence, and sedimentation, and the results provide age constraints for the volcanic and tectonic processes along the western margin of the Espanola Basin. The Middle Miocene volcanic rocks are interbedded within the Santa Fe Group, which is divided into the Hernandez and Vallito Members of the Chamita Formation and the Chama-El Rito Member of the Tesuque Formation, in descending stratigraphic order. New and published geochemical results from the Guaje well field and from other surface and subsurface mafic and intermediate lava flows within the Pajarito Plateau suggest that the volcanic rocks erupted from different magmatic sources and centers close to the Pajarito fault zone. Multiple pulses of volcanic eruptions mostly confined to the hanging wall of the Pajarito fault zone, which represents the current western boundary fault of the Espanola Basin, suggest that the Pajarito fault system has been sporadically reactivated several times, beginning at least in the Middle Miocene and continuing to the Plio-Pleistocene. Moreover, the volcanic, tectonic, and sedimentary records in the Pajarito Plateau suggest that there is no evidence for eastward migration of tectonic and volcanic activities from the Canada de Cochiti fault zone in the southern part of the Jemez Mountains to the Pajarito fault zone during the early Pliocene (4-5 Ma). JF - Special Paper - Geological Society of America AU - WoldeGabriel, Giday AU - Koning, Daniel J AU - Broxton, David AU - Warren, Richard G Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 221 EP - 238 PB - Geological Society of America (GSA), Boulder, CO VL - 494 SN - 0072-1077, 0072-1077 KW - United States KW - volcanic rocks KW - X-ray diffraction data KW - igneous rocks KW - Pajarito Plateau KW - mass spectra KW - subsidence KW - New Mexico KW - thin sections KW - Rio Grande Rift KW - Cenozoic KW - Santa Fe Group KW - dates KW - volcanism KW - basalts KW - absolute age KW - X-ray fluorescence spectra KW - Pajarito Fault KW - Tesuque Formation KW - tectonics KW - spectra KW - basalt flows KW - chemical composition KW - faults KW - Espanola Basin KW - Ar/Ar KW - North America KW - Vallito Member KW - sedimentation KW - middle Miocene KW - Miocene KW - Tertiary KW - Neogene KW - Hernandez Member KW - Chamita Formation KW - 03:Geochronology KW - 12:Stratigraphy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1371762041?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Special+Paper+-+Geological+Society+of+America&rft.atitle=Chronology+of+volcanism%2C+tectonics%2C+and+sedimentation+near+the+western+boundary+fault+of+the+Espanola+Basin%2C+Rio+Grande+Rift%2C+New+Mexico&rft.au=WoldeGabriel%2C+Giday%3BKoning%2C+Daniel+J%3BBroxton%2C+David%3BWarren%2C+Richard+G&rft.aulast=WoldeGabriel&rft.aufirst=Giday&rft.date=2013-04-01&rft.volume=494&rft.issue=&rft.spage=221&rft.isbn=&rft.btitle=&rft.title=Special+Paper+-+Geological+Society+of+America&rft.issn=00721077&rft_id=info:doi/10.1130%2F2013.2494%2809%29 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 51 N1 - PubXState - CO N1 - Document feature - illus. incl. strat. cols., 3 tables, sketch map N1 - Last updated - 2013-09-20 N1 - CODEN - GSAPAZ N1 - SubjectsTermNotLitGenreText - absolute age; Ar/Ar; basalt flows; basalts; Cenozoic; Chamita Formation; chemical composition; dates; Espanola Basin; faults; Hernandez Member; igneous rocks; mass spectra; middle Miocene; Miocene; Neogene; New Mexico; North America; Pajarito Fault; Pajarito Plateau; Rio Grande Rift; Santa Fe Group; sedimentation; spectra; subsidence; tectonics; Tertiary; Tesuque Formation; thin sections; United States; Vallito Member; volcanic rocks; volcanism; X-ray diffraction data; X-ray fluorescence spectra DO - http://dx.doi.org/10.1130/2013.2494(09) ER - TY - JOUR T1 - Structure and tectonic evolution of the eastern Espanola Basin, Rio Grande Rift, north-central New Mexico AN - 1371761966; 2013-049658 AB - We describe the structure of the eastern Espanola Basin and use stratigraphic and stratal attitude data to interpret its tectonic development. This area consists of a west-dipping half graben in the northern Rio Grande rift that includes several intrabasinal grabens, faults, and folds. The Embudo-Santa Clara-Pajarito fault system, a collection of northeast- and north-striking faults in the center of the Espanola Basin, defines the western boundary of the half graben and was active throughout rifting. Throw rates near the middle of the fault system (i.e., the Santa Clara and north Pajarito faults) and associated hanging-wall tilt rates progressively increased during the middle Miocene. East of Espanola, hanging-wall tilt rates decreased after 10-12 Ma, coinciding with increased throw rates on the Canada del Almagre fault. This fault may have temporarily shunted slip from the north Pajarito fault during ca. 8-11 Ma, resulting in lower strain rates on the Santa Clara fault. East of the Embudo-Santa Clara-Pajarito fault system, deformation of the southern Barrancos monocline and the Canada Ancha graben peaked during the early-middle Miocene and effectively ceased by the late Pliocene. The north-striking Gabeldon faulted monocline lies at the base of the Sangre de Cristo Mountains, where stratal dip relations indicate late Oligocene and Miocene tilting. Shifting of strain toward the Embudo-Santa Clara-Pajarito fault system culminated during the late Pliocene-Quaternary. Collectively, our data suggest that extensional tectonism in the eastern Espanola Basin increased in the early Miocene and probably peaked between 14-15 Ma and 9-10 Ma, preceding and partly accompanying major volcanism, and decreased in the Plio-Pleistocene. JF - Special Paper - Geological Society of America AU - Koning, Daniel J AU - Grauch, V J S AU - Connell, Sean D AU - Ferguson, John AU - McIntosh, William AU - Slate, Janet L AU - Wan, Elmira AU - Baldridge, W Scott Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 185 EP - 219 PB - Geological Society of America (GSA), Boulder, CO VL - 494 SN - 0072-1077, 0072-1077 KW - United States KW - strain KW - Sangre de Cristo Mountains KW - slip rates KW - New Mexico KW - Rio Grande Rift KW - Cenozoic KW - gravity methods KW - Santa Fe Group KW - dip KW - dates KW - sedimentation rates KW - folds KW - basins KW - absolute age KW - Tesuque Formation KW - tectonics KW - faults KW - Espanola Basin KW - Ar/Ar KW - North America KW - landform evolution KW - sedimentation KW - geophysical methods KW - Gabeldon Fault KW - U. S. Rocky Mountains KW - deformation KW - half grabens KW - extension KW - Tertiary KW - Neogene KW - Rocky Mountains KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1371761966?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Special+Paper+-+Geological+Society+of+America&rft.atitle=Structure+and+tectonic+evolution+of+the+eastern+Espanola+Basin%2C+Rio+Grande+Rift%2C+north-central+New+Mexico&rft.au=Koning%2C+Daniel+J%3BGrauch%2C+V+J+S%3BConnell%2C+Sean+D%3BFerguson%2C+John%3BMcIntosh%2C+William%3BSlate%2C+Janet+L%3BWan%2C+Elmira%3BBaldridge%2C+W+Scott&rft.aulast=Koning&rft.aufirst=Daniel&rft.date=2013-04-01&rft.volume=494&rft.issue=&rft.spage=185&rft.isbn=&rft.btitle=&rft.title=Special+Paper+-+Geological+Society+of+America&rft.issn=00721077&rft_id=info:doi/10.1130%2F2013.2494%2808%29 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 140 N1 - PubXState - CO N1 - Document feature - illus. incl. geol. sketch map, sects., 2 tables, strat. col. N1 - Last updated - 2013-06-27 N1 - CODEN - GSAPAZ N1 - SubjectsTermNotLitGenreText - absolute age; Ar/Ar; basins; Cenozoic; dates; deformation; dip; Espanola Basin; extension; faults; folds; Gabeldon Fault; geophysical methods; gravity methods; half grabens; landform evolution; Neogene; New Mexico; North America; Rio Grande Rift; Rocky Mountains; Sangre de Cristo Mountains; Santa Fe Group; sedimentation; sedimentation rates; slip rates; strain; tectonics; Tertiary; Tesuque Formation; U. S. Rocky Mountains; United States DO - http://dx.doi.org/10.1130/2013.2494(08) ER - TY - JOUR T1 - RISK-BASED CONTAINMENT AND AIR MONITORING CRITERIA FOR WORK WITH DISPERSIBLE RADIOACTIVE MATERIALS AN - 1328512264; 17841111 AB - This paper presents readily understood, technically defensible, risk-based containment and air monitoring criteria, which are developed from fundamental physical principles. The key for the development of each criterion was the use of a cal-culational de minimis level, in this case chosen to be 100 mrem (or 40 DAC-h). Examples are provided that demonstrate the effective use of each criterion. Comparison to other often used criteria is provided. JF - Health Physics AU - Veluri, V R AU - Justus, AL AD - Los Alamos National Laboratory, Los Alamos, NM 87545, USA, ajustus@lanl.gov Y1 - 2013/04// PY - 2013 DA - Apr 2013 SP - 419 EP - 427 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 104 IS - 4 SN - 0017-9078, 0017-9078 KW - Risk Abstracts; Pollution Abstracts KW - Pollution monitoring KW - Radioactive materials KW - Containment KW - R2 23020:Technological risks KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328512264?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=RISK-BASED+CONTAINMENT+AND+AIR+MONITORING+CRITERIA+FOR+WORK+WITH+DISPERSIBLE+RADIOACTIVE+MATERIALS&rft.au=Veluri%2C+V+R%3BJustus%2C+AL&rft.aulast=Veluri&rft.aufirst=V&rft.date=2013-04-01&rft.volume=104&rft.issue=4&rft.spage=419&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/10.1097%2FHP.0b013e318282de97 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-04-01 N1 - Last updated - 2014-05-15 N1 - SubjectsTermNotLitGenreText - Pollution monitoring; Radioactive materials; Containment DO - http://dx.doi.org/10.1097/HP.0b013e318282de97 ER - TY - JOUR T1 - Ground truth determinations of detonation sites of peaceful nuclear explosions in the Sakha Republic (Yakutia), Russia AN - 1328506113; 2013-035169 AB - Although ground truth (GT) locations for peaceful nuclear explosions (PNEs) conducted in the former Soviet Union are generally thought to be well known, they can be erroneous by up to tens of kilometers. Information (maps, photographs, descriptions) published in radionuclide contamination and environmental studies, combined with satellite imagery, allow for the improvement of the coordinates of these detonations. We are able to link disturbed areas visible in satellite imagery to probable detonation sites for all PNEs conducted in the Sakha Republic (Yakutia), Russia, and improve on, or confirm, previously published solutions; taking possible uncertainties and alternative sites into consideration, all of them can be located to GT0 or GT1. The improvements are most pronounced for Crystal, where a mound over the detonation site can be identified, and for detonations conducted for the purpose of enhanced petroleum recovery near Tas-Yuryakh. JF - Bulletin of the Seismological Society of America AU - Fujita, K AU - Mackey, K G AU - Hartse, H E Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 730 EP - 740 PB - Seismological Society of America, Berkeley, CA VL - 103 IS - 2A SN - 0037-1106, 0037-1106 KW - petroleum exploration KW - technology KW - geophysical surveys KW - petroleum KW - elastic waves KW - Russian Federation KW - radioactive fallout KW - Commonwealth of Independent States KW - ground truth KW - seismicity KW - deep seismic sounding KW - focus KW - nuclear explosions KW - Asia KW - seismic profiles KW - explosions KW - geophysical methods KW - Yakutia Russian Federation KW - satellite methods KW - seismic methods KW - boreholes KW - traveltime KW - surveys KW - geophysical profiles KW - earthquakes KW - remote sensing KW - 19:Seismology KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328506113?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America&rft.atitle=Ground+truth+determinations+of+detonation+sites+of+peaceful+nuclear+explosions+in+the+Sakha+Republic+%28Yakutia%29%2C+Russia&rft.au=Fujita%2C+K%3BMackey%2C+K+G%3BHartse%2C+H+E&rft.aulast=Fujita&rft.aufirst=K&rft.date=2013-04-01&rft.volume=103&rft.issue=2A&rft.spage=730&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120120176 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Seismological Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 30 N1 - PubXState - CA N1 - Document feature - illus. incl. 2 tables, sketch maps N1 - Last updated - 2013-04-19 N1 - CODEN - BSSAAP N1 - SubjectsTermNotLitGenreText - Asia; boreholes; Commonwealth of Independent States; deep seismic sounding; earthquakes; elastic waves; explosions; focus; geophysical methods; geophysical profiles; geophysical surveys; ground truth; nuclear explosions; petroleum; petroleum exploration; radioactive fallout; remote sensing; Russian Federation; satellite methods; seismic methods; seismic profiles; seismicity; surveys; technology; traveltime; Yakutia Russian Federation DO - http://dx.doi.org/10.1785/0120120176 ER - TY - JOUR T1 - Upscaling retardation factor in hierarchical porous media with multimodal reactive mineral facies. AN - 1317403925; 23260249 AB - Aquifer heterogeneity controls spatial and temporal variability of reactive transport parameters and has significant impacts on subsurface modeling of flow, transport, and remediation. Upscaling (or homogenization) is a process to replace a heterogeneous domain with a homogeneous one such that both reproduce the same response. To make reliable and accurate predictions of reactive transport for contaminant in chemically and physically heterogeneous porous media, subsurface reactive transport modeling needs upscaled parameters such as effective retardation factor to perform field-scale simulations. This paper develops a conceptual model of multimodal reactive mineral facies for upscaling reactive transport parameters of hierarchical heterogeneous porous media. Based on the conceptual model, covariance of hydraulic conductivity, sorption coefficient, flow velocity, retardation factor, and cross-covariance between flow velocity and retardation factor are derived from geostatistical characterizations of a three-dimensional unbounded aquifer system. Subsequently, using a Lagrangian approach the scale-dependent analytical expressions are derived to describe the scaling effect of effective retardation factors in temporal and spatial domains. When time and space scales become sufficiently large, the effective retardation factors approximate their composite arithmetic mean. Correlation between the hydraulic conductivity and the sorption coefficient can significantly affect the values of the effective retardation factor in temporal and spatial domains. When the temporal and spatial scales are relatively small, scaling effect of the effective retardation factors is relatively large. This study provides a practical methodology to develop effective transport parameters for field-scale modeling at which remediation and risk assessment is actually conducted. It does not only bridge the gap between bench-scale measurements to field-scale modeling, but also provide new insights into the influence of hierarchical mineral distribution on effective retardation factor. JF - Chemosphere AU - Deng, Hailin AU - Dai, Zhenxue AU - Wolfsberg, Andrew V AU - Ye, Ming AU - Stauffer, Philip H AU - Lu, Zhiming AU - Kwicklis, Edward AD - Earth and Environmental Sciences Division, Los Alamos National Laboratory, EES-16, T003, Los Alamos, NM 87545, United States. hailin@lanl.gov Y1 - 2013/04// PY - 2013 DA - April 2013 SP - 248 EP - 257 VL - 91 IS - 3 KW - Minerals KW - 0 KW - Water Pollutants, Chemical KW - Index Medicus KW - Water Movements KW - Porosity KW - Adsorption KW - Environmental Monitoring -- methods KW - Groundwater -- chemistry KW - Water Pollutants, Chemical -- chemistry KW - Minerals -- chemistry KW - Models, Chemical UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1317403925?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Chemosphere&rft.atitle=Upscaling+retardation+factor+in+hierarchical+porous+media+with+multimodal+reactive+mineral+facies.&rft.au=Deng%2C+Hailin%3BDai%2C+Zhenxue%3BWolfsberg%2C+Andrew+V%3BYe%2C+Ming%3BStauffer%2C+Philip+H%3BLu%2C+Zhiming%3BKwicklis%2C+Edward&rft.aulast=Deng&rft.aufirst=Hailin&rft.date=2013-04-01&rft.volume=91&rft.issue=3&rft.spage=248&rft.isbn=&rft.btitle=&rft.title=Chemosphere&rft.issn=1879-1298&rft_id=info:doi/10.1016%2Fj.chemosphere.2012.10.105 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2013-06-25 N1 - Date created - 2013-03-13 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1016/j.chemosphere.2012.10.105 ER - TY - CPAPER T1 - Kinetic Monte Carlo Modeling of Tc-Fe Dissolution: Formations of Pits and Channels T2 - 68th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2013) AN - 1369229202; 6214692 JF - 68th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2013) AU - Taylor, Christopher Y1 - 2013/03/17/ PY - 2013 DA - 2013 Mar 17 KW - Monte Carlo simulation KW - Channels KW - Kinetics KW - Statistical analysis KW - Dissolution KW - Pits UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1369229202?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=68th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2013%29&rft.atitle=Kinetic+Monte+Carlo+Modeling+of+Tc-Fe+Dissolution%3A+Formations+of+Pits+and+Channels&rft.au=Taylor%2C+Christopher&rft.aulast=Taylor&rft.aufirst=Christopher&rft.date=2013-03-17&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=68th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://www.nace.org/cstm/Events/Schedule.aspx?id=3c0b3545-0379-e111-ba5a-0050569a007b LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-05-31 N1 - Last updated - 2013-06-19 ER - TY - CPAPER T1 - The Aqueous Corrosion Behavior of Technetium--Nickel Composite and Alloy Materials T2 - 68th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2013) AN - 1369229140; 6214498 JF - 68th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2013) AU - Kolman, David AU - Jarvinen, Gordon AU - Taylor, Christopher AU - Goff, George AU - Cisneros, Mike AU - Mausolf, Edward AU - Czerwinski, Kenneth Y1 - 2013/03/17/ PY - 2013 DA - 2013 Mar 17 KW - Composite materials KW - Corrosion KW - Alloys KW - alloys UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1369229140?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=68th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2013%29&rft.atitle=The+Aqueous+Corrosion+Behavior+of+Technetium--Nickel+Composite+and+Alloy+Materials&rft.au=Kolman%2C+David%3BJarvinen%2C+Gordon%3BTaylor%2C+Christopher%3BGoff%2C+George%3BCisneros%2C+Mike%3BMausolf%2C+Edward%3BCzerwinski%2C+Kenneth&rft.aulast=Kolman&rft.aufirst=David&rft.date=2013-03-17&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=68th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://www.nace.org/cstm/Events/Schedule.aspx?id=3c0b3545-0379-e111-ba5a-0050569a007b LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-05-31 N1 - Last updated - 2013-06-19 ER - TY - CPAPER T1 - Thermodynamics Controlling Metal Atom Dissolution/Alloying Effect Predicted by Molecular Simulation T2 - 68th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2013) AN - 1369228800; 6214438 JF - 68th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2013) AU - Pham, Hieu AU - Taylor, Christopher AU - Henson, Neil Y1 - 2013/03/17/ PY - 2013 DA - 2013 Mar 17 KW - Metals KW - Thermodynamics KW - Dissolution KW - Simulation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1369228800?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=68th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2013%29&rft.atitle=Thermodynamics+Controlling+Metal+Atom+Dissolution%2FAlloying+Effect+Predicted+by+Molecular+Simulation&rft.au=Pham%2C+Hieu%3BTaylor%2C+Christopher%3BHenson%2C+Neil&rft.aulast=Pham&rft.aufirst=Hieu&rft.date=2013-03-17&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=68th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://www.nace.org/cstm/Events/Schedule.aspx?id=3c0b3545-0379-e111-ba5a-0050569a007b LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-05-31 N1 - Last updated - 2013-06-19 ER - TY - CPAPER T1 - How Valence, Coordination and Reactivity Control the Oxidation of Fresh Metal Surfaces T2 - 68th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2013) AN - 1369228516; 6214487 JF - 68th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2013) AU - Taylor, Christopher AU - Francis, Michael AU - Olatunji-Ojo, Olayinka Y1 - 2013/03/17/ PY - 2013 DA - 2013 Mar 17 KW - Metals KW - Oxidation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1369228516?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=68th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2013%29&rft.atitle=How+Valence%2C+Coordination+and+Reactivity+Control+the+Oxidation+of+Fresh+Metal+Surfaces&rft.au=Taylor%2C+Christopher%3BFrancis%2C+Michael%3BOlatunji-Ojo%2C+Olayinka&rft.aulast=Taylor&rft.aufirst=Christopher&rft.date=2013-03-17&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=68th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://www.nace.org/cstm/Events/Schedule.aspx?id=3c0b3545-0379-e111-ba5a-0050569a007b LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-05-31 N1 - Last updated - 2013-06-19 ER - TY - JOUR T1 - Numerical modelling of porphyroclast and porphyroblast rotation in anisotropic rocks AN - 1328506073; 2013-035072 AB - The rotational behaviour of rigid objects in a weaker rock matrix during deformation has been the subject of many field, experimental and numerical modelling studies, often centred on the question whether objects rotate or not in non-coaxial deformation. With numerical studies gaining increasing popularity and importance we here provide an overview of the results published so far and provide new simulations. Originally, shape and orientation were investigated, while the emphasis shifted to rheology and slip between object and matrix in the nineties of the last century. Due to improved numerical techniques, anisotropic rheology has become the focus of most recent studies, indicating that it is a primary factor in the rotation behaviour of objects. We present new simulations investigating the role of anisotropy on different scales relative to the object, and show how this influences the rotation rate, as well as the inclusion patterns in case of syntectonically growing porphyroblasts. These simulations show that a variety of factors play a role to determine the rate and sense of rotation of objects. The variability of the inclusion patterns that can develop necessitates extreme caution in the kinematic interpretation of these structures when observed in the field. Abstract Copyright (2013) Elsevier, B.V. JF - Tectonophysics AU - Griera, Albert AU - Llorens, Maria-Gema AU - Gomez-Rivas, Enrique AU - Bons, Paul D AU - Jessell, Mark W AU - Evans, Lynn A AU - Lebensohn, Ricardo Y1 - 2013/03/05/ PY - 2013 DA - 2013 Mar 05 SP - 4 EP - 29 PB - Elsevier, Amsterdam VL - 587 SN - 0040-1951, 0040-1951 KW - experimental studies KW - anisotropic materials KW - shear zones KW - patterns KW - porphyroclastic texture KW - numerical models KW - strain KW - porphyroblastic texture KW - textures KW - structural analysis KW - deformation KW - simulation KW - kinematics KW - rotation KW - folds KW - metamorphic rocks KW - syntectonic processes KW - field studies KW - 16:Structural geology KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328506073?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Tectonophysics&rft.atitle=Numerical+modelling+of+porphyroclast+and+porphyroblast+rotation+in+anisotropic+rocks&rft.au=Griera%2C+Albert%3BLlorens%2C+Maria-Gema%3BGomez-Rivas%2C+Enrique%3BBons%2C+Paul+D%3BJessell%2C+Mark+W%3BEvans%2C+Lynn+A%3BLebensohn%2C+Ricardo&rft.aulast=Griera&rft.aufirst=Albert&rft.date=2013-03-05&rft.volume=587&rft.issue=&rft.spage=4&rft.isbn=&rft.btitle=&rft.title=Tectonophysics&rft.issn=00401951&rft_id=info:doi/10.1016%2Fj.tecto.2012.10.008 L2 - http://www.sciencedirect.com/science/journal/00401951 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 114 N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2013-04-19 N1 - CODEN - TCTOAM N1 - SubjectsTermNotLitGenreText - anisotropic materials; deformation; experimental studies; field studies; folds; kinematics; metamorphic rocks; numerical models; patterns; porphyroblastic texture; porphyroclastic texture; rotation; shear zones; simulation; strain; structural analysis; syntectonic processes; textures DO - http://dx.doi.org/10.1016/j.tecto.2012.10.008 ER - TY - JOUR T1 - Elucidating geochemical response of shallow heterogeneous aquifers to CO (sub 2) leakage using high-performance computing; implications for monitoring of CO (sub 2) sequestration AN - 1739085118; 2015-116188 AB - Predicting and quantifying impacts of potential carbon dioxide (CO (sub 2) ) leakage into shallow aquifers that overlie geologic CO (sub 2) storage formations is an important part of developing reliable carbon storage techniques. Leakage of CO (sub 2) through fractures, faults or faulty wellbores can reduce groundwater pH, inducing geochemical reactions that release solutes into the groundwater and pose a risk of degrading groundwater quality. In order to help quantify this risk, predictions of metal concentrations are needed during geologic storage of CO (sub 2) . Here, we present regional-scale reactive transport simulations, at relatively fine-scale, of CO (sub 2) leakage into shallow aquifers run on the PFLOTRAN platform using high-performance computing. Multiple realizations of heterogeneous permeability distributions were generated using standard geostatistical methods. Increased statistical anisotropy of the permeability field resulted in more lateral and vertical spreading of the plume of impacted water, leading to increased Pb (super 2+) (lead) concentrations and lower pH at a well down gradient of the CO (sub 2) leak. Pb (super 2+) concentrations were higher in simulations where calcite was the source of Pb (super 2+) compared to galena. The low solubility of galena effectively buffered the Pb (super 2+) concentrations as galena reached saturation under reducing conditions along the flow path. In all cases, Pb (super 2+) concentrations remained below the maximum contaminant level set by the EPA. Results from this study, compared to natural variability observed in aquifers, suggest that bicarbonate (HCO (sub 3) (super -) ) concentrations may be a better geochemical indicator of a CO (sub 2) leak under the conditions simulated here. Abstract Copyright (2013) Elsevier, B.V. JF - Advances in Water Resources AU - Navarre-Sitchler, Alexis K AU - Maxwell, Reed M AU - Siirila, Erica R AU - Hammond, Glenn E AU - Lichtner, Peter C Y1 - 2013/03// PY - 2013 DA - March 2013 SP - 45 EP - 55 PB - Elsevier, Oxford VL - 53 SN - 0309-1708, 0309-1708 KW - water quality KW - lead KW - gas storage KW - simulation KW - drinking water KW - seepage KW - environmental effects KW - ground water KW - carbon dioxide KW - transport KW - tracers KW - reactive transport KW - pH KW - monitoring KW - carbon sequestration KW - numerical models KW - prediction KW - bicarbonate ion KW - calcite KW - aquifers KW - galena KW - metals KW - shallow aquifers KW - sulfides KW - carbonates KW - 30:Engineering geology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1739085118?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Advances+in+Water+Resources&rft.atitle=Elucidating+geochemical+response+of+shallow+heterogeneous+aquifers+to+CO+%28sub+2%29+leakage+using+high-performance+computing%3B+implications+for+monitoring+of+CO+%28sub+2%29+sequestration&rft.au=Navarre-Sitchler%2C+Alexis+K%3BMaxwell%2C+Reed+M%3BSiirila%2C+Erica+R%3BHammond%2C+Glenn+E%3BLichtner%2C+Peter+C&rft.aulast=Navarre-Sitchler&rft.aufirst=Alexis&rft.date=2013-03-01&rft.volume=53&rft.issue=&rft.spage=45&rft.isbn=&rft.btitle=&rft.title=Advances+in+Water+Resources&rft.issn=03091708&rft_id=info:doi/10.1016%2Fj.advwatres.2012.10.005 L2 - http://www.sciencedirect.com/science/journal/03091708 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2015-01-01 N1 - Number of references - 55 N1 - Document feature - illus. incl. 5 tables N1 - Last updated - 2015-12-04 N1 - SubjectsTermNotLitGenreText - aquifers; bicarbonate ion; calcite; carbon dioxide; carbon sequestration; carbonates; drinking water; environmental effects; galena; gas storage; ground water; lead; metals; monitoring; numerical models; pH; prediction; reactive transport; seepage; shallow aquifers; simulation; sulfides; tracers; transport; water quality DO - http://dx.doi.org/10.1016/j.advwatres.2012.10.005 ER - TY - JOUR T1 - Erosion at inception of deep-sea channels AN - 1469616674; 2013-100072 AB - We present a general model for channel inception and evolution in the deep sea by integrating observations from two complementary datasets: (1) high-resolution multibeam bathymetry and chirp sub-bottom profiles of the Lucia Chica channel system on the seafloor offshore central California, and (2) the well-exposed channelized strata of the Tres Pasos Formation in southern Chile. The Lucia Chica channel system shows laterally offset, sub-parallel channels that evolved across a similar gradient, but display different architecture, reflecting the influence of channel maturity and intrinsic cyclicity of channel formation. The stratigraphically oldest channel is narrower with well-developed levees while the younger channelized features are broader and bounded by low-relief levees or no levees at all. The high-resolution Lucia Chica dataset is integrated with detailed field observations of channel axis-to-margin sedimentary facies relationships and the stratigraphic context afforded from depositional-dip continuity in outcrops of the Tres Pasos Formation. Numerous channels from the outcrop belt are characterized by initial erosional stages. By combining these two datasets with numerical analysis, experimental work, and previous interpretations of additional outcropping strata and seafloor examples, we hypothesize that an initial erosional template extending into a basin is a pre-requisite for creation of channels in deep-sea environments. Abstract Copyright (2013) Elsevier, B.V. JF - Marine and Petroleum Geology AU - Fildani, Andrea AU - Hubbard, Stephen M AU - Covault, Jacob A AU - Maier, Katherine L AU - Romans, Brian W AU - Traer, Miles AU - Rowland, Joel C Y1 - 2013/03// PY - 2013 DA - March 2013 SP - 48 EP - 61 PB - Elsevier, Oxford VL - 41 SN - 0264-8172, 0264-8172 KW - United States KW - seismic stratigraphy KW - continental slope KW - Northeast Pacific KW - geophysical surveys KW - erosion features KW - Chile KW - Southeast Pacific KW - California KW - vertical seismic profiles KW - southern Chile KW - sedimentary rocks KW - bottom features KW - digital simulation KW - ocean floors KW - East Pacific KW - seismic profiles KW - numerical models KW - landform evolution KW - Central California KW - geophysical methods KW - channels KW - South Pacific KW - seismic methods KW - case studies KW - South America KW - North Pacific KW - Pacific Ocean KW - theoretical models KW - surveys KW - geophysical profiles KW - 06A:Sedimentary petrology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616674?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Marine+and+Petroleum+Geology&rft.atitle=Erosion+at+inception+of+deep-sea+channels&rft.au=Fildani%2C+Andrea%3BHubbard%2C+Stephen+M%3BCovault%2C+Jacob+A%3BMaier%2C+Katherine+L%3BRomans%2C+Brian+W%3BTraer%2C+Miles%3BRowland%2C+Joel+C&rft.aulast=Fildani&rft.aufirst=Andrea&rft.date=2013-03-01&rft.volume=41&rft.issue=&rft.spage=48&rft.isbn=&rft.btitle=&rft.title=Marine+and+Petroleum+Geology&rft.issn=02648172&rft_id=info:doi/10.1016%2Fj.marpetgeo.2012.03.006 L2 - http://www.sciencedirect.com/science/journal/02648172 LA - English DB - GeoRef N1 - Conference title - Internal architecture, bedforms and geometry of turbidite channels N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 99 N1 - Document feature - illus. incl. sects., sketch maps N1 - Last updated - 2013-12-20 N1 - SubjectsTermNotLitGenreText - bottom features; California; case studies; Central California; channels; Chile; continental slope; digital simulation; East Pacific; erosion features; geophysical methods; geophysical profiles; geophysical surveys; landform evolution; North Pacific; Northeast Pacific; numerical models; ocean floors; Pacific Ocean; sedimentary rocks; seismic methods; seismic profiles; seismic stratigraphy; South America; South Pacific; Southeast Pacific; southern Chile; surveys; theoretical models; United States; vertical seismic profiles DO - http://dx.doi.org/10.1016/j.marpetgeo.2012.03.006 ER - TY - JOUR T1 - CO (sub 2) leakage impacts on shallow ground water; field scale reactive transport simulations informed by observations at a natural analog site AN - 1420516401; 2013-065078 AB - It is challenging to predict the degree to which shallow groundwater might be affected by leaks from a CO (sub 2) sequestration reservoir, particularly over long time scales and large spatial scales. In this study observations at a CO (sub 2) enriched shallow aquifer natural analog were used to develop a predictive model which is then used to simulate leakage scenarios. This natural analog provides the opportunity to make direct field observations of groundwater chemistry in the presence of elevated CO (sub 2) , to collect aquifer samples and expose them to CO (sub 2) under controlled conditions in the laboratory, and to test the ability of multi-phase reactive transport models to reproduce measured geochemical trends at the field-scale. The field observations suggest that brackish water entrained with the upwelling CO (sub 2) are a more significant source of trace metals than in situ mobilization of metals due to exposure to CO (sub 2) . The study focuses on a single trace metal of concern at this site: U. Experimental results indicate that cation exchange/adsorption and dissolution/precipitation of calcite containing trace amounts of U are important reactions controlling U in groundwater at this site, and that the amount of U associated with calcite is fairly well constrained. Simulations incorporating these results into a 3-D multi-phase reactive transport model are able to reproduce the measured ranges and trends between pH, pCO (sub 2) , Ca, total C, U and Cl (super -) at the field site. Although the true fluxes at the natural analog site are unknown, the cumulative CO (sub 2) flux inferred from these simulations are approximately equivalent to 37.8E-3MT, approximately corresponding to a .001% leak rate for injection at a large (750MW) power plant. The leakage scenario simulations suggest that if the leak only persists for a short time the volume of aquifer contaminated by CO (sub 2) -induced mobilization of U will be relatively small, yet persistent over 100 a. Abstract Copyright (2013) Elsevier, B.V. JF - Applied Geochemistry AU - Keating, Elizabeth H AU - Hakala, J Alexandra AU - Viswanathan, Hari AU - Carey, J William AU - Pawar, Rajesh AU - Guthrie, George D AU - Fessenden-Rahn, Julianna Y1 - 2013/03// PY - 2013 DA - March 2013 SP - 136 EP - 147 PB - Elsevier, Oxford-New York-Beijing VL - 30 SN - 0883-2927, 0883-2927 KW - United States KW - solute transport KW - upwelling KW - Sangre de Cristo Mountains KW - hydrogeology KW - gas storage KW - New Mexico KW - simulation KW - seepage KW - ground water KW - air pollution KW - Rio Grande Rift KW - environmental management KW - Santa Fe Group KW - chemical reactions KW - water-rock interaction KW - transport KW - basins KW - Espanola Basin KW - North America KW - Chimayuo New Mexico KW - carbon sequestration KW - pollutants KW - prediction KW - pollution KW - U. S. Rocky Mountains KW - solubility KW - hydrochemistry KW - aquifers KW - brackish water KW - precipitation KW - natural analogs KW - shallow aquifers KW - Rocky Mountains KW - 02B:Hydrochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1420516401?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Applied+Geochemistry&rft.atitle=CO+%28sub+2%29+leakage+impacts+on+shallow+ground+water%3B+field+scale+reactive+transport+simulations+informed+by+observations+at+a+natural+analog+site&rft.au=Keating%2C+Elizabeth+H%3BHakala%2C+J+Alexandra%3BViswanathan%2C+Hari%3BCarey%2C+J+William%3BPawar%2C+Rajesh%3BGuthrie%2C+George+D%3BFessenden-Rahn%2C+Julianna&rft.aulast=Keating&rft.aufirst=Elizabeth&rft.date=2013-03-01&rft.volume=30&rft.issue=&rft.spage=136&rft.isbn=&rft.btitle=&rft.title=Applied+Geochemistry&rft.issn=08832927&rft_id=info:doi/10.1016%2Fj.apgeochem.2012.08.007 L2 - http://www.sciencedirect.com/science/journal/08832927 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 46 N1 - Document feature - illus. incl. 4 tables, geol. sketch map N1 - Last updated - 2013-08-15 N1 - SubjectsTermNotLitGenreText - air pollution; aquifers; basins; brackish water; carbon sequestration; chemical reactions; Chimayuo New Mexico; environmental management; Espanola Basin; gas storage; ground water; hydrochemistry; hydrogeology; natural analogs; New Mexico; North America; pollutants; pollution; precipitation; prediction; Rio Grande Rift; Rocky Mountains; Sangre de Cristo Mountains; Santa Fe Group; seepage; shallow aquifers; simulation; solubility; solute transport; transport; U. S. Rocky Mountains; United States; upwelling; water-rock interaction DO - http://dx.doi.org/10.1016/j.apgeochem.2012.08.007 ER - TY - JOUR T1 - Clustering revisited; a spectral analysis of microseismic events AN - 1366816486; 2013-046108 AB - Identifying individual subsurface faults in a larger fault system is important to characterize and understand the relationship between microseismicity and subsurface processes. This information can potentially help drive reservoir management and mitigate the risks of natural or induced seismicity. We have evaluated a method of statistically clustering power spectra from microseismic events associated with an enhanced oil recovery operation in southeast Utah. Specifically, we were able to provide a clear distinction within a set of events originally designated in the time domain as a single cluster and to identify evidence of en echelon faulting. Subtle time-domain differences between events were accentuated in the frequency domain. Power spectra based on the Fourier transform of the time-domain autocorrelation function were used, as this formulation results in statistically independent intensities and is supported by a full body of statistical theory upon which decision frameworks can be developed. JF - Geophysics AU - Fagan, Deborah AU - van Wijk, Kasper AU - Rutledge, James Y1 - 2013/03/01/ PY - 2013 DA - 2013 Mar 01 SP - KS41 EP - KS49 PB - Society of Exploration Geophysicists, Tulsa, OK VL - 78 IS - 2 SN - 0016-8033, 0016-8033 KW - United States KW - en echelon faults KW - microseismic methods KW - statistical analysis KW - data processing KW - spectral analysis KW - enhanced recovery KW - oil and gas fields KW - frequency domain analysis KW - cluster analysis KW - Paradox Basin KW - fast Fourier transforms KW - Fourier analysis KW - autocorrelation KW - Utah KW - microearthquakes KW - earthquakes KW - faults KW - covariance analysis KW - 19:Seismology KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1366816486?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysics&rft.atitle=Clustering+revisited%3B+a+spectral+analysis+of+microseismic+events&rft.au=Fagan%2C+Deborah%3Bvan+Wijk%2C+Kasper%3BRutledge%2C+James&rft.aulast=Fagan&rft.aufirst=Deborah&rft.date=2013-03-01&rft.volume=78&rft.issue=2&rft.spage=KS41&rft.isbn=&rft.btitle=&rft.title=Geophysics&rft.issn=00168033&rft_id=info:doi/10.1190%2Fgeo2012-0323.1 L2 - http://library.seg.org/journal/gpysa7 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 29 N1 - PubXState - OK N1 - Document feature - illus. incl. sketch map N1 - Last updated - 2013-06-13 N1 - CODEN - GPYSA7 N1 - SubjectsTermNotLitGenreText - autocorrelation; cluster analysis; covariance analysis; data processing; earthquakes; en echelon faults; enhanced recovery; fast Fourier transforms; faults; Fourier analysis; frequency domain analysis; microearthquakes; microseismic methods; oil and gas fields; Paradox Basin; spectral analysis; statistical analysis; United States; Utah DO - http://dx.doi.org/10.1190/geo2012-0323.1 ER - TY - JOUR T1 - A Discrete Maximum Principle for the Implicit Monte Carlo Equations AN - 1349452596; 17875935 AB - It is well known that temperature solutions of the Implicit Monte Carlo (IMC) equations can exceed the external boundary temperatures, a violation of the "maximum principle." Previous attempts to prescribe a maximum value of the time-step size (white up-triangle)(t) that is sufficient to eliminate these violations have recommended a (white up-triangle)(t) that is typically too small to be used in practice and that appeared to be much too conservative when compared to the actual (white up-triangle)(t) required to prevent maximum principle violations in numerical solutions of the IMC equations. In this paper we derive a new, approximate estimator for the maximum time-step size that includes the spatial-grid size (white up-triangle)(x) of the temperature field. We also provide exact necessary and sufficient conditions on the maximum time-step size that are easier to calculate. These explicitly demonstrate that the effect of coarsening (white up-triangle)(x) is to reduce the limitation on (white up-triangle)(t). This helps explain the overly conservative nature of the earlier, grid-independent results. We demonstrate that the new time-step restriction is a much more accurate predictor of violations of the maximum principle. We discuss how the implications of the new, grid-dependent time-step restriction can affect IMC solution algorithms. JF - Nuclear Science and Engineering AU - Wollaber, Allan B AU - Larsen, Edward W AU - Densmore, Jeffery D AD - Los Alamos National Laboratory, CCS-2, P.O. Box 1663, MS D409, Los Alamos, New Mexico 87545 wollaber@lanl.gov Y1 - 2013/03// PY - 2013 DA - Mar 2013 SP - 259 EP - 275 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 173 IS - 3 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Estimators KW - Maximum principle KW - Mathematical models KW - Constrictions KW - Monte Carlo methods KW - Boundaries KW - Approximation KW - Mathematical analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1349452596?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=A+Discrete+Maximum+Principle+for+the+Implicit+Monte+Carlo+Equations&rft.au=Wollaber%2C+Allan+B%3BLarsen%2C+Edward+W%3BDensmore%2C+Jeffery+D&rft.aulast=Wollaber&rft.aufirst=Allan&rft.date=2013-03-01&rft.volume=173&rft.issue=3&rft.spage=259&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-05-01 N1 - Number of references - 13 N1 - Last updated - 2014-05-06 ER - TY - JOUR T1 - A residence time-based transport approach for the ground water pathway in performance assessment models AN - 1347457496; 2013-038313 AB - This paper presents the theoretical development and numerical implementation of a new modeling approach for representing the groundwater pathway in risk assessment or performance assessment model of a contaminant transport system. The model developed in the present study, called the Residence Time Distribution (RTD) Mixing Model (RTDMM), allows for an arbitrary distribution of fluid travel times to be represented, to capture the effects on the breakthrough curve of flow processes such as channelized flow and fast pathways and complex three-dimensional dispersion. Mathematical methods for constructing the model for a given RTD are derived directly from the theory of residence time distributions in flowing systems. A simple mixing model is presented, along with the basic equations required to enable an arbitrary RTD to be reproduced using the model. The practical advantages of the RTDMM include easy incorporation into a multi-realization probabilistic simulation; computational burden no more onerous than a one-dimensional model with the same number of grid cells; and straightforward implementation into available flow and transport modeling codes, enabling one to then utilize advanced transport features of that code. For example, in this study we incorporated diffusion into the stagnant fluid in the rock matrix away from the flowing fractures, using a generalized dual porosity model formulation. A suite of example calculations presented herein showed the utility of the RTDMM for the case of a radioactive decay chain, dual porosity transport and sorption. Abstract Copyright (2013) Elsevier, B.V. JF - Computers & Geosciences AU - Robinson, Bruce A AU - Chu, Shaoping Y1 - 2013/03// PY - 2013 DA - March 2013 SP - 155 EP - 163 PB - Elsevier, Amsterdam VL - 52 SN - 0098-3004, 0098-3004 KW - solute transport KW - sorption KW - isotopes KW - data processing KW - simulation KW - reservoir rocks KW - ground water KW - environmental management KW - fractures KW - radioactive isotopes KW - transport KW - sensitivity analysis KW - mixing KW - movement KW - tracers KW - probability KW - water pollution KW - pollutants KW - numerical analysis KW - Monte Carlo analysis KW - statistical analysis KW - pollution KW - equations KW - hydrochemistry KW - porosity KW - models KW - residence time KW - mathematical methods KW - risk assessment KW - reservoir properties KW - hydraulic conductivity KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1347457496?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Geosciences&rft.atitle=A+residence+time-based+transport+approach+for+the+ground+water+pathway+in+performance+assessment+models&rft.au=Robinson%2C+Bruce+A%3BChu%2C+Shaoping&rft.aulast=Robinson&rft.aufirst=Bruce&rft.date=2013-03-01&rft.volume=52&rft.issue=&rft.spage=155&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Geosciences&rft.issn=00983004&rft_id=info:doi/10.1016%2Fj.cageo.2012.09.001 L2 - http://www.sciencedirect.com/science?_ob=JournalURL&_cdi=5840&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=e5198452fad934c6346f38b57511c8e0 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 36 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2013-05-02 N1 - CODEN - GGEOD5 N1 - SubjectsTermNotLitGenreText - data processing; environmental management; equations; fractures; ground water; hydraulic conductivity; hydrochemistry; isotopes; mathematical methods; mixing; models; Monte Carlo analysis; movement; numerical analysis; pollutants; pollution; porosity; probability; radioactive isotopes; reservoir properties; reservoir rocks; residence time; risk assessment; sensitivity analysis; simulation; solute transport; sorption; statistical analysis; tracers; transport; water pollution DO - http://dx.doi.org/10.1016/j.cageo.2012.09.001 ER - TY - JOUR T1 - Disarming Libya? A reassessment after the Arab Spring AN - 1324954738; 4426168 AB - In 2011, several months after a popular revolt overturned the Gaddafi regime in Libya, Libya's new National Transitional Council announced the discovery of what was later confirmed to be an undeclared stockpile of chemical weapons. This was a startling announcement to many observers, since Libya had publicly renounced its weapons of mass destruction (WMD) programmes in 2003 and had apparently dismantled the programmes soon after. Although the Libyan case had repeatedly been referred to as a positive ' ;model' for nonproliferation - an instance where a country had voluntarily and peacefully rolled back its WMD programs— ;this recent discovery forces us to wonder whether the Libyan ' ;model' really was as successful as initially described. This article examines the successes, challenges and lessons that can be learned from the Libyan case of WMD renunciation and verification. As one model of cooperative verification, the Libyan case highlights not only the opportunities afforded by monitoring and verification regimes, but also some of the difficulties that any such regime will encounter in real-world circumstances, however positive. Reprinted by permission of Blackwell Publishers JF - International affairs [London] AU - Busch, Nathan E AU - Pilat, Joseph F AD - Christopher Newport University ; Los Alamos National Laboratory Y1 - 2013/03// PY - 2013 DA - Mar 2013 SP - 451 EP - 475 VL - 89 IS - 2 SN - 0020-5850, 0020-5850 KW - Political Science KW - Chemical weapons KW - Nuclear non-proliferation KW - Weapons of mass destruction KW - Political regimes KW - Libya KW - Political programmes KW - Revolt UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1324954738?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aibss&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+affairs+%5BLondon%5D&rft.atitle=Disarming+Libya%3F+A+reassessment+after+the+Arab+Spring&rft.au=Busch%2C+Nathan+E%3BPilat%2C+Joseph+F&rft.aulast=Busch&rft.aufirst=Nathan&rft.date=2013-03-01&rft.volume=89&rft.issue=2&rft.spage=451&rft.isbn=&rft.btitle=&rft.title=International+affairs+%5BLondon%5D&rft.issn=00205850&rft_id=info:doi/10.1111%2F1468-2346.12027 LA - English DB - International Bibliography of the Social Sciences (IBSS) N1 - Date revised - 2013-06-12 N1 - Last updated - 2013-09-16 N1 - SubjectsTermNotLitGenreText - 2174 13504 13501 1304 7805 3198 1077; 13504 13501 1304 7805 3198 1077; 8766; 9768; 9759; 11001 9634; 215 292 2 DO - http://dx.doi.org/10.1111/1468-2346.12027 ER - TY - JOUR T1 - Temperature as a potent driver of regional forest drought stress and tree mortality AN - 1318695662; 17761368 AB - As the climate changes, drought may reduce tree productivity and survival across many forest ecosystems; however, the relative influence of specific climate parameters on forest decline is poorly understood. We derive a forest drought-stress index (FDSI) for the southwestern United States using a comprehensive tree-ring data set representing AD 1000-2007. The FDSI is approximately equally influenced by the warm-season vapour-pressure deficit (largely controlled by temperature) and cold-season precipitation, together explaining 82% of the FDSI variability. Correspondence between the FDSI and measures of forest productivity, mortality, bark-beetle outbreak and wildfire validate the FDSI as a holistic forest-vigour indicator. If the vapour-pressure deficit continues increasing as projected by climate models, the mean forest drought-stress by the 2050s will exceed that of the most severe droughts in the past 1,000 years. Collectively, the results foreshadow twenty-first-century changes in forest structures and compositions, with transition of forests in the southwestern United States, and perhaps water-limited forests globally, towards distributions unfamiliar to modern civilization. JF - Nature Climate Change AU - Park Williams, A AU - Allen, Craig D AU - Macalady, Alison K AU - Griffin, Daniel AU - Woodhouse, Connie A AU - Meko, David M AU - Swetnam, Thomas W AU - Rauscher, Sara A AU - Seager, Richard AU - Grissino-Mayer, Henri D AU - Dean, Jeffrey S AU - Cook, Edward R AU - Gangodagamage, Chandana AU - Cai, Michael AU - McDowell, Nate G AD - Earth & Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA Y1 - 2013/03// PY - 2013 DA - March 2013 SP - 292 EP - 297 PB - Nature Publishing Group, The Macmillan Building London N1 9XW United Kingdom VL - 3 IS - 3 SN - 1758-678X, 1758-678X KW - Aqualine Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts; Water Resources Abstracts; Environment Abstracts; Sustainability Science Abstracts KW - Dendroclimatology KW - Trees KW - Rainfall KW - Climate change KW - Forests KW - Survival KW - Drought KW - Vapors KW - Tree ring analysis KW - Droughts KW - Mortality KW - Climate models KW - Forest ecosystems KW - Climates KW - Temperature KW - Forest productivity KW - Precipitation KW - USA KW - Productivity KW - Mortality causes KW - Q2 09243:Structure, mechanics and thermodynamics KW - SW 5010:Network design KW - M2 551.583:Variations (551.583) KW - M3 1010:Issues in Sustainable Development KW - AQ 00008:Effects of Pollution KW - ENA 20:Weather Modification & Geophysical Change UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1318695662?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+Climate+Change&rft.atitle=Temperature+as+a+potent+driver+of+regional+forest+drought+stress+and+tree+mortality&rft.au=Park+Williams%2C+A%3BAllen%2C+Craig+D%3BMacalady%2C+Alison+K%3BGriffin%2C+Daniel%3BWoodhouse%2C+Connie+A%3BMeko%2C+David+M%3BSwetnam%2C+Thomas+W%3BRauscher%2C+Sara+A%3BSeager%2C+Richard%3BGrissino-Mayer%2C+Henri+D%3BDean%2C+Jeffrey+S%3BCook%2C+Edward+R%3BGangodagamage%2C+Chandana%3BCai%2C+Michael%3BMcDowell%2C+Nate+G&rft.aulast=Park+Williams&rft.aufirst=A&rft.date=2013-03-01&rft.volume=3&rft.issue=3&rft.spage=292&rft.isbn=&rft.btitle=&rft.title=Nature+Climate+Change&rft.issn=1758678X&rft_id=info:doi/10.1038%2Fnclimate1693 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-03-01 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Climate change; Survival; Forests; Droughts; Mortality causes; Dendroclimatology; Forest ecosystems; Climate models; Forest productivity; Precipitation; Drought; Tree ring analysis; Mortality; Vapors; Trees; Rainfall; Temperature; Climates; Productivity; USA DO - http://dx.doi.org/10.1038/nclimate1693 ER - TY - JOUR T1 - Hysteretic nonlinear elasticity of Berea Sandstone at low-vibrational strain revealed by dynamic acousto-elastic testing AN - 1429840772; 2013-070365 AB - Through changes in wave speed of ultrasonic pulses traversing the sample, we measure variations in the elasticity of dry Berea sandstone as a function of the applied low-frequency (LF) axial strain (varied from 10 (super -7) to 10 (super -5) ). The approach, termed dynamic acousto-elasticity, is the dynamic analog of static acousto-elasticity where the wave speed is measured as a function of the applied static load. Dynamic acousto-elasticity uses low-frequency vibrational loading of smaller strain amplitude, typically below 10 (super -4) , and it includes inertial effects. At strain amplitudes around 10 (super -6) , compression and tension produce a material softening of the material. In contrast, a quasi-static compression inducing a strain between 10 (super -4) and 10 (super -3) leads to a material stiffening. At 10 (super -5) strain amplitude, elaborate hysteretic signatures of modulus strain are observed. The measurements provide the first direct experimental evidence of hysteretic nonlinear (wave amplitude dependent) elasticity in a sandstone at low dynamic strains. Abstract Copyright (2013), American Geophysical Union. All Rights Reserved. JF - Geophysical Research Letters AU - Renaud, G AU - Riviere, J AU - Le Bas, P Y AU - Johnson, P A Y1 - 2013/02/28/ PY - 2013 DA - 2013 Feb 28 SP - 715 EP - 719 PB - American Geophysical Union, Washington, DC VL - 40 IS - 4 SN - 0094-8276, 0094-8276 KW - experimental studies KW - elasticity KW - acoustical properties KW - strain KW - engineering properties KW - Paleozoic KW - Berea Sandstone KW - sandstone KW - mechanical properties KW - rock mechanics KW - laboratory studies KW - sedimentary rocks KW - vibration KW - nonlinear processes KW - clastic rocks KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429840772?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Hysteretic+nonlinear+elasticity+of+Berea+Sandstone+at+low-vibrational+strain+revealed+by+dynamic+acousto-elastic+testing&rft.au=Renaud%2C+G%3BRiviere%2C+J%3BLe+Bas%2C+P+Y%3BJohnson%2C+P+A&rft.aulast=Renaud&rft.aufirst=G&rft.date=2013-02-28&rft.volume=40&rft.issue=4&rft.spage=715&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1002%2Fgrl.50150 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 28 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2013-09-05 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - acoustical properties; Berea Sandstone; clastic rocks; elasticity; engineering properties; experimental studies; laboratory studies; mechanical properties; nonlinear processes; Paleozoic; rock mechanics; sandstone; sedimentary rocks; strain; vibration DO - http://dx.doi.org/10.1002/grl.50150 ER - TY - JOUR T1 - Why do mafic arc magmas contain approximately 4 wt% water on average? AN - 1429844299; 2013-070236 AB - The last 15 yr have seen an explosion of data on the volatile contents of magmas parental to arc volcanoes. This has occurred due to the intense study of melt inclusions trapped in volcanic phenocrysts, aliquots of magma that have presumably escaped degassing during eruption. The surprising first-order result is the narrow range in H (sub 2) O concentrations in the least degassed melt inclusions from each volcano. Nearly all arc volcanoes are sourced with mafic magmas that contain 2-6 wt% H (sub 2) O. The average for each arc varies even less, from 3.2 (for the Cascades) to 4.5 (for the Marianas), with a global average of 3.9+ or -0.4 wt% H (sub 2) O. Significant variations occur from volcano to volcano within each arc, but the means are indistinguishable within one s.d. The narrow range and common average value for H (sub 2) O are in stark contrast to the concentrations of most other subduction tracers, such as Nb or Ba, which vary by orders of magnitude. A modulating process, either in the crust or mantle, is likely responsible for the restricted range in the H (sub 2) O contents of arc melt inclusions. One possibility is that melt inclusion H (sub 2) O values reflect vapor saturation at the last storage depth in the crust prior to eruption. In this scenario, magmas rise from the mantle with variable H (sub 2) O contents (>4 wt%), become vapor-saturated and start degassing, and continue to degas up until the depth at which they stall. If the stalling depths are approximately 6 km, which is common for storage depths beneath volcanoes, magmas would be saturated at approximately 4 wt% H (sub 2) O, and melt inclusions, most of which become closed during further ascent, would thus record 4 wt% H (sub 2) O. Another possibility is that the mantle melting process modulates water content in the melt such that magmas rise out of the mantle with approximately 4 wt% H (sub 2) O. A strong relationship between the water content of the source, H (sub 2) O (sub (o)) and the degree of melting (F) maintains nearly constant water contents in the melt for a restricted range in mantle temperature. Magmas with 3-4wt% H (sub 2) O can be generated at approximately 50 degrees below the dry solidus for a wide range in F and H (sub 2) O (sub (o)) . The narrow range in wedge temperatures may be another manifestation of a planet with average upper mantle of 1400 degrees C potential temperature. The characteristic mean and range of H (sub 2) O contents of arc magmas has implications for both the volatile fuel for explosive eruptions and the mass balance of H (sub 2) O recycled through subduction zones. Abstract Copyright (2013) Elsevier, B.V. JF - Earth and Planetary Science Letters AU - Plank, Terry AU - Kelley, Katherine A AU - Zimmer, Mindy M AU - Hauri, Erik H AU - Wallace, Paul J Y1 - 2013/02/15/ PY - 2013 DA - 2013 Feb 15 SP - 168 EP - 179 PB - Elsevier, Amsterdam VL - 364 SN - 0012-821X, 0012-821X KW - subduction zones KW - recycling KW - mantle KW - mafic composition KW - subduction KW - melt inclusions KW - explosive eruptions KW - depth KW - gases KW - feedback KW - volatiles KW - island arcs KW - magmas KW - eruptions KW - inclusions KW - water content KW - fluid inclusions KW - phenocrysts KW - magma chambers KW - crust KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429844299?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Earth+and+Planetary+Science+Letters&rft.atitle=Why+do+mafic+arc+magmas+contain+approximately+4+wt%25+water+on+average%3F&rft.au=Plank%2C+Terry%3BKelley%2C+Katherine+A%3BZimmer%2C+Mindy+M%3BHauri%2C+Erik+H%3BWallace%2C+Paul+J&rft.aulast=Plank&rft.aufirst=Terry&rft.date=2013-02-15&rft.volume=364&rft.issue=&rft.spage=168&rft.isbn=&rft.btitle=&rft.title=Earth+and+Planetary+Science+Letters&rft.issn=0012821X&rft_id=info:doi/10.1016%2Fj.epsl.2012.11.044 L2 - http://www.sciencedirect.com/science/journal/0012821X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 102 N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2013-09-05 N1 - CODEN - EPSLA2 N1 - SubjectsTermNotLitGenreText - crust; depth; eruptions; explosive eruptions; feedback; fluid inclusions; gases; inclusions; island arcs; mafic composition; magma chambers; magmas; mantle; melt inclusions; phenocrysts; recycling; subduction; subduction zones; volatiles; water content DO - http://dx.doi.org/10.1016/j.epsl.2012.11.044 ER - TY - CPAPER T1 - Covalency and the Relative Roles of 5f and 6d Orbitals in Actinide Metal-Ligand Bonds T2 - 2013 Annual Meeting of the American Association for the Advancement of Science (AAAS 2013) AN - 1369227866; 6213579 JF - 2013 Annual Meeting of the American Association for the Advancement of Science (AAAS 2013) AU - Clark, David Y1 - 2013/02/14/ PY - 2013 DA - 2013 Feb 14 KW - Actinides UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1369227866?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2013+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2013%29&rft.atitle=Covalency+and+the+Relative+Roles+of+5f+and+6d+Orbitals+in+Actinide+Metal-Ligand+Bonds&rft.au=Clark%2C+David&rft.aulast=Clark&rft.aufirst=David&rft.date=2013-02-14&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2013+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2013%29&rft.issn=&rft_id=info:doi/ L2 - http://aaas.confex.com/aaas/2013/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-05-31 N1 - Last updated - 2013-06-19 ER - TY - JOUR T1 - Modeling challenges for predicting hydrologic response to degrading permafrost AN - 1400618516; 2013-055347 JF - Hydrogeology Journal AU - Painter, Scott L AU - Moulton, J D AU - Wilson, C J AU - Hinzman, Larry D AU - Destouni, Georgia AU - Woo, Ming-ko Y1 - 2013/02// PY - 2013 DA - February 2013 SP - 221 EP - 224 PB - Springer, Berlin - Heidelberg VL - 21 IS - 1 SN - 1431-2174, 1431-2174 KW - climatic controls KW - soil dynamics KW - permafrost KW - geologic hazards KW - one-dimensional models KW - global change KW - periglacial features KW - land subsidence KW - displacements KW - simulation KW - hydrologic cycle KW - conservation KW - heat flow KW - sediments KW - hydrology KW - carbon sequestration KW - Arctic region KW - thermal properties KW - surface water KW - porous materials KW - subarctic regions KW - ice wedges KW - frost action KW - natural hazards KW - theoretical models KW - frozen ground KW - meltwater KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400618516?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Hydrogeology+Journal&rft.atitle=Modeling+challenges+for+predicting+hydrologic+response+to+degrading+permafrost&rft.au=Painter%2C+Scott+L%3BMoulton%2C+J+D%3BWilson%2C+C+J%3BHinzman%2C+Larry+D%3BDestouni%2C+Georgia%3BWoo%2C+Ming-ko&rft.aulast=Painter&rft.aufirst=Scott&rft.date=2013-02-01&rft.volume=21&rft.issue=1&rft.spage=221&rft.isbn=&rft.btitle=&rft.title=Hydrogeology+Journal&rft.issn=14312174&rft_id=info:doi/10.1007%2Fs10040-012-0917-4 L2 - http://www.springerlink.com/content/102028/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2013-01-01 N1 - Number of references - 18 N1 - Document feature - illus. N1 - Last updated - 2013-07-18 N1 - SubjectsTermNotLitGenreText - Arctic region; carbon sequestration; climatic controls; conservation; displacements; frost action; frozen ground; geologic hazards; global change; heat flow; hydrologic cycle; hydrology; ice wedges; land subsidence; meltwater; natural hazards; one-dimensional models; periglacial features; permafrost; porous materials; sediments; simulation; soil dynamics; subarctic regions; surface water; theoretical models; thermal properties DO - http://dx.doi.org/10.1007/s10040-012-0917-4 ER - TY - JOUR T1 - Permafrost degradation and subsurface-flow changes caused by surface warming trends AN - 1400618506; 2013-055351 AB - Change dynamics of permafrost thaw, and associated changes in subsurface flow and seepage into surface water, are analysed for different warming trends in soil temperature at the ground surface with a three-phase two-component flow system coupled to heat transport. Changes in annual, seasonal and extreme flows are analysed for three warming-temperature trends, representing simplified climate-change scenarios. The results support previous studies of reduced temporal variability of groundwater flow across all investigated trends. Decreased intra-annual flow variability may thus serve as an early indicator of permafrost degradation before longer-term changes in mean flows are notable. This is advantageous since hydrological data are considerably easier to obtain, may be available in longer time series, and generally reflect larger-scale conditions than direct permafrost observations. The results further show that permafrost degradation first leads to increasing water discharge, which then decreases as the permafrost degradation progresses further to total thaw. The most pronounced changes occur for minimum annual flows. The configuration considered represents subsurface discharge from a generic heterogeneous soil-type domain. Copyright 2012 Springer-Verlag Berlin Heidelberg JF - Hydrogeology Journal AU - Frampton, Andrew AU - Painter, Scott L AU - Destouni, Georgia AU - Hinzman, Larry D AU - Woo, Ming-ko Y1 - 2013/02// PY - 2013 DA - February 2013 SP - 271 EP - 280 PB - Springer, Berlin - Heidelberg VL - 21 IS - 1 SN - 1431-2174, 1431-2174 KW - permafrost KW - numerical models KW - annual variations KW - three-dimensional models KW - porous materials KW - global change KW - fluid dynamics KW - simulation KW - climate change KW - ground water KW - aquifers KW - models KW - saturation KW - heat flow KW - multiphase flow KW - discharge KW - permeability KW - global warming KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400618506?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Hydrogeology+Journal&rft.atitle=Permafrost+degradation+and+subsurface-flow+changes+caused+by+surface+warming+trends&rft.au=Frampton%2C+Andrew%3BPainter%2C+Scott+L%3BDestouni%2C+Georgia%3BHinzman%2C+Larry+D%3BWoo%2C+Ming-ko&rft.aulast=Frampton&rft.aufirst=Andrew&rft.date=2013-02-01&rft.volume=21&rft.issue=1&rft.spage=271&rft.isbn=&rft.btitle=&rft.title=Hydrogeology+Journal&rft.issn=14312174&rft_id=info:doi/10.1007%2Fs10040-012-0938-z L2 - http://www.springerlink.com/content/102028/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2013-01-01 N1 - Number of references - 24 N1 - Document feature - illus. incl. 10 tables N1 - Last updated - 2013-07-18 N1 - SubjectsTermNotLitGenreText - annual variations; aquifers; climate change; discharge; fluid dynamics; global change; global warming; ground water; heat flow; models; multiphase flow; numerical models; permafrost; permeability; porous materials; saturation; simulation; three-dimensional models DO - http://dx.doi.org/10.1007/s10040-012-0938-z ER - TY - JOUR T1 - Quantifying and relating land-surface and subsurface variability in permafrost environments using LiDAR and surface geophysical datasets AN - 1400618499; 2013-055343 AB - The value of remote sensing and surface geophysical data for characterizing the spatial variability and relationships between land-surface and subsurface properties was explored in an Alaska (USA) coastal plain ecosystem. At this site, a nested suite of measurements was collected within a region where the land surface was dominated by polygons, including: LiDAR data; ground-penetrating radar, electromagnetic, and electrical-resistance tomography data; active-layer depth, soil temperature, soil-moisture content, soil texture, soil carbon and nitrogen content; and pore-fluid cations. LiDAR data were used to extract geomorphic metrics, which potentially indicate drainage potential. Geophysical data were used to characterize active-layer depth, soil-moisture content, and permafrost variability. Cluster analysis of the LiDAR and geophysical attributes revealed the presence of three spatial zones, which had unique distributions of geomorphic, hydrological, thermal, and geochemical properties. The correspondence between the LiDAR-based geomorphic zonation and the geophysics-based active-layer and permafrost zonation highlights the significant linkage between these ecosystem compartments. This study suggests the potential of combining LiDAR and surface geophysical measurements for providing high-resolution information about land-surface and subsurface properties as well as their spatial variations and linkages, all of which are important for quantifying terrestrial-ecosystem evolution and feedbacks to climate. Copyright 2013 Springer-Verlag Berlin Heidelberg and 2012 Springer-Verlag Berlin Heidelberg (outside the USA) JF - Hydrogeology Journal AU - Hubbard, S S AU - Gangodagamage, C AU - Dafflon, B AU - Wainwright, H AU - Peterson, J AU - Gusmeroli, A AU - Ulrich, C AU - Wu, Y AU - Wilson, C J AU - Rowland, J AU - Tweedie, C AU - Wullschleger, S D AU - Hinzman, Larry D AU - Destouni, Georgia AU - Woo, Ming-ko Y1 - 2013/02// PY - 2013 DA - February 2013 SP - 149 EP - 169 PB - Springer, Berlin - Heidelberg VL - 21 IS - 1 SN - 1431-2174, 1431-2174 KW - United States KW - terrestrial environment KW - permafrost KW - degradation KW - apparent resistivity KW - laser methods KW - spatial data KW - moisture KW - ground-penetrating radar KW - data acquisition KW - data processing KW - ecosystems KW - coastal plains KW - Barrow Alaska KW - cluster analysis KW - sediments KW - electromagnetic methods KW - Arctic Ocean KW - ecology KW - interpretation KW - buried features KW - hydrology KW - soil mechanics KW - high-resolution methods KW - drainage KW - statistical analysis KW - geophysical methods KW - radar methods KW - porous materials KW - Arctic Coastal Plain KW - measurement KW - lidar methods KW - frost action KW - Alaska KW - Brooks Range KW - active layer KW - remote sensing KW - 21:Hydrogeology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400618499?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Hydrogeology+Journal&rft.atitle=Quantifying+and+relating+land-surface+and+subsurface+variability+in+permafrost+environments+using+LiDAR+and+surface+geophysical+datasets&rft.au=Hubbard%2C+S+S%3BGangodagamage%2C+C%3BDafflon%2C+B%3BWainwright%2C+H%3BPeterson%2C+J%3BGusmeroli%2C+A%3BUlrich%2C+C%3BWu%2C+Y%3BWilson%2C+C+J%3BRowland%2C+J%3BTweedie%2C+C%3BWullschleger%2C+S+D%3BHinzman%2C+Larry+D%3BDestouni%2C+Georgia%3BWoo%2C+Ming-ko&rft.aulast=Hubbard&rft.aufirst=S&rft.date=2013-02-01&rft.volume=21&rft.issue=1&rft.spage=149&rft.isbn=&rft.btitle=&rft.title=Hydrogeology+Journal&rft.issn=14312174&rft_id=info:doi/10.1007%2Fs10040-012-0939-y L2 - http://www.springerlink.com/content/102028/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2013-01-01 N1 - Number of references - 86 N1 - Document feature - illus. incl. 2 tables, sketch map N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-10-17 N1 - SubjectsTermNotLitGenreText - active layer; Alaska; Arctic Coastal Plain; apparent resistivity; Arctic Ocean; Barrow Alaska; Brooks Range; buried features; cluster analysis; coastal plains; data acquisition; data processing; degradation; drainage; ecology; ecosystems; electromagnetic methods; frost action; geophysical methods; ground-penetrating radar; high-resolution methods; hydrology; interpretation; laser methods; lidar methods; measurement; moisture; permafrost; porous materials; radar methods; remote sensing; sediments; soil mechanics; spatial data; statistical analysis; terrestrial environment; United States DO - http://dx.doi.org/10.1007/s10040-012-0939-y ER - TY - JOUR T1 - A CO sub(2)-PENS model of methods and costs for treatment of water extracted during geologic carbon sequestration AN - 1323811873; 17840360 AB - Extraction of water during subsurface carbon sequestration may be useful for the control of CO sub(2) placement, reducing pressure risks, and mitigating environmental risks. Desalination of this water may be possible if costs are kept low, in order to minimize the quantity that must be reinjected or otherwise disposed. Added value may be recovered in the form of treated water that can be reused by carbon capture, sequestration, and other industrial processes. Total dissolved solids will range from 10,000 mg/L up to over 100,000 mg/L, and temperatures may range up to 120 degree C, once the water is brought to the surface. We have developed a system-level, mesoscale analysis module for the CO sub(2)-Predicting engineered natural system model to analyze the feasibility of treatment, the costs of treatment, the value of energy recovery, and the costs of concentrate disposal. Costs are derived from a database of reported literature values. The model allows the user to select the most economic options for treatment, to compare costs, and to understand the trade-off of risks and costs. Results of preliminary modeling indicate that while reverse osmosis is feasible within certain temperature and salinity ranges, nanofiltration and thermal methods may be more cost-effective or otherwise feasible. JF - Desalination and Water Treatment AU - Sullivan, E J AU - Chu, S AU - Stauffer, PH AU - Pawar, R J AD - Chemical Diagnostics and Engineering Group, Los Alamos National Laboratory, MS J964, Los Alamos, NM 87544, USA, ejs@lanl.gov Y1 - 2013/02// PY - 2013 DA - February 2013 SP - 1487 EP - 1493 PB - European Desalination Society, Tosti 28 1-67100 L'Aquila Italy VL - 51 IS - 7-9 SN - 1944-3994, 1944-3994 KW - Oceanic Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Aqualine Abstracts; Environment Abstracts KW - Dissolved Solids KW - Mitigation KW - Reverse osmosis KW - Water Costs KW - Desalination KW - Costs KW - Carbon sequestration KW - Salinity KW - Carbon KW - Water treatment KW - Economics KW - Dissolved solids KW - Modelling KW - Temperature KW - Model Studies KW - Risk KW - Filtration KW - Carbon dioxide KW - Q2 09268:Heat flow KW - SW 5010:Network design KW - AQ 00007:Industrial Effluents KW - O 4080:Pollution - Control and Prevention KW - ENA 12:Oceans & Estuaries UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1323811873?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Desalination+and+Water+Treatment&rft.atitle=A+CO+sub%282%29-PENS+model+of+methods+and+costs+for+treatment+of+water+extracted+during+geologic+carbon+sequestration&rft.au=Sullivan%2C+E+J%3BChu%2C+S%3BStauffer%2C+PH%3BPawar%2C+R+J&rft.aulast=Sullivan&rft.aufirst=E&rft.date=2013-02-01&rft.volume=51&rft.issue=7-9&rft.spage=1487&rft.isbn=&rft.btitle=&rft.title=Desalination+and+Water+Treatment&rft.issn=19443994&rft_id=info:doi/10.1080%2F19443994.2012.714727 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-04-01 N1 - Last updated - 2016-03-30 N1 - SubjectsTermNotLitGenreText - Costs; Reverse osmosis; Carbon; Water treatment; Desalination; Carbon dioxide; Modelling; Carbon sequestration; Mitigation; Filtration; Salinity; Economics; Temperature; Dissolved solids; Dissolved Solids; Risk; Water Costs; Model Studies DO - http://dx.doi.org/10.1080/19443994.2012.714727 ER - TY - JOUR T1 - Uncovering f-element bonding differences and electronic structure in a series of 1 : 3 and 1 : 4 complexes with a diselenophosphinate ligand AN - 1315690297; 17652258 AB - Understanding the bonding trends within, and the differences between, the 4f and 5f element series with soft donor atom ligands will aid elucidation of the fundamental origins of actinide (An) versuslanthanide (Ln) selectivity that is integral to many advanced nuclear fuel cycle separation concepts. One of the principal obstacles to acquiring such knowledge is the dearth of well characterized transuranic molecules that prevents the necessary comparison of 4f versus5f coordination chemistry, electronic structure, and bonding. Reported herein is new chemistry of selenium analogues of dithiophosphinate actinide extractants. Ln super(III) and An super(III/IV) complexes with the diselenophosphinate [Se sub(2)PPh sub(2)] super(-) anion have been synthesized, structurally and spectroscopically characterized, and quantum chemical calculations performed on model compounds in which the phenyl rings have been replaced by methyl groups. The complexes [Ln super(III)(Se sub(2)PPh sub(2)) sub(3)(THF) sub(2)] (Ln = La (1), Ce (2), Nd (3)), [La super(III)(Se sub(2)PPh sub(2)) sub(3)(MeCN) sub(2)] (4), [Pu super(III)(Se sub(2)PPh sub(2)) sub(3)(THF) sub(2)] (5), [Et sub(4)N][M super(III)(Se sub(2)PPh sub(2)) sub(4)] (M = Ce (6), Pu (7)), and [An super(IV)(Se sub(2)PPh sub(2)) sub(4)] (An = U (8), Np (9)), represent the first f-element diselenophosphinates. In conjunction with the calculated models, complexes 1-9 were utilized to examine two important factors: firstly, bonding trends/differences between trivalent 4f and 5f cations of near identical ionic radii; secondly, bonding trend differences across the 5f series within the An super(IV) oxidation state. Analysis of both experimental and computational data supports the conclusion of enhanced covalent bonding contributions in Pu super(III)-Se versusCe super(III)-Se bonding, while differences between U super(IV)-Se and Np super(IV)-Se bonding is satisfactorily accounted for by changes in the strength of ionic interactions as a result of the increased positive charge density on Np super(IV) compared to U super(IV) ions. These findings improve understanding of soft donor ligand binding to the f-elements, and are of relevance to the design and manipulation of f-element extraction processes. JF - Chemical Science AU - Jones, Matthew B AU - Gaunt, Andrew J AU - Gordon, John C AU - Kaltsoyannis, Nikolas AU - Neu, Mary P AU - Scott, Brian L AD - Chemistry Division; Los Alamos National Laboratory; Los Alamos; New Mexico 87545; USA; , gaunt@lanl.gov Y1 - 2013/02// PY - 2013 DA - Feb 2013 SP - 1189 EP - 1203 PB - Royal Society of Chemistry, c/o Springer-Verlag New York Inc. Secaucus New Jersey 07096 2485 United States VL - 4 IS - 3 SN - 2041-6520, 2041-6520 KW - Water Resources Abstracts; Aqualine Abstracts KW - Ions KW - Anions KW - Density KW - Model Studies KW - Cations KW - Bonding KW - Selectivity KW - Fuel KW - SW 5010:Network design KW - AQ 00006:Sewage UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1315690297?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Chemical+Science&rft.atitle=Uncovering+f-element+bonding+differences+and+electronic+structure+in+a+series+of+1+%3A+3+and+1+%3A+4+complexes+with+a+diselenophosphinate+ligand&rft.au=Jones%2C+Matthew+B%3BGaunt%2C+Andrew+J%3BGordon%2C+John+C%3BKaltsoyannis%2C+Nikolas%3BNeu%2C+Mary+P%3BScott%2C+Brian+L&rft.aulast=Jones&rft.aufirst=Matthew&rft.date=2013-02-01&rft.volume=4&rft.issue=3&rft.spage=1189&rft.isbn=&rft.btitle=&rft.title=Chemical+Science&rft.issn=20416520&rft_id=info:doi/10.1039%2Fc2sc21806b LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-04-01 N1 - Number of references - 66 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Ions; Anions; Cations; Density; Bonding; Selectivity; Fuel; Model Studies DO - http://dx.doi.org/10.1039/c2sc21806b ER - TY - JOUR T1 - A stochastic dimension reduction multiscale finite element method for ground water flow problems in heterogeneous random porous media AN - 1347459805; 2013-038244 AB - In this paper we present a stochastic dimension reduction multiscale finite element method for solving groundwater flow problems in heterogeneous random porous media. The stochastic conductivity is parameterized in a stochastic space using a truncated Karhunen-Loeve expansion with finite random variables. This often results in high stochastic dimensionality due to small correlation length and large variance of the inherent covariance function. In order to treat the high-dimensional stochastic problems efficiently, a truncated high-dimensional model representation (HDMR) technique is proposed that decomposes the high-dimensional stochastic problem into a moderate-dimensional stochastic problem and a few one-dimensional stochastic problems. The derived low-dimensional stochastic problems are solved by incorporating a sparse grid stochastic collocation method (SGSCM) with the proposed HDMR. This leads to a set of uncoupled deterministic problems at the sparse grid collocation points. To capture the small-scale heterogeneities in physical space, a multiscale finite element method (MsFEM) is utilized to solve these deterministic problems. Since the SGSCM and MsFEM are implemented in the different spaces, the integrated approach inherits the advantages from both of the SGSCM and the MsFEM, in which each low-dimensional stochastic problem is decoupled each other at small number of stochastic collocation points and is solved on a coarse spatial mesh. To demonstrate the efficiency and accuracy of the proposed stochastic MsFEM with the HDMR technique, a few numerical experiments are carried out for the transient water flow problems in heterogeneous random media with different correlation lengths and various degrees of spatial variabilities. Abstract Copyright (2013) Elsevier, B.V. JF - Journal of Hydrology AU - He, Xinguang AU - Jiang, Lijian AU - Moulton, J David Y1 - 2013/01/25/ PY - 2013 DA - 2013 Jan 25 SP - 77 EP - 88 PB - Elsevier, Amsterdam VL - 478 SN - 0022-1694, 0022-1694 KW - statistical analysis KW - data processing KW - porous materials KW - reservoir rocks KW - ground water KW - finite element analysis KW - heterogeneous materials KW - stochastic processes KW - movement KW - mathematical methods KW - hydraulic conductivity KW - covariance analysis KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1347459805?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Hydrology&rft.atitle=A+stochastic+dimension+reduction+multiscale+finite+element+method+for+ground+water+flow+problems+in+heterogeneous+random+porous+media&rft.au=He%2C+Xinguang%3BJiang%2C+Lijian%3BMoulton%2C+J+David&rft.aulast=He&rft.aufirst=Xinguang&rft.date=2013-01-25&rft.volume=478&rft.issue=&rft.spage=77&rft.isbn=&rft.btitle=&rft.title=Journal+of+Hydrology&rft.issn=00221694&rft_id=info:doi/10.1016%2Fj.jhydrol.2012.11.052 L2 - http://www.sciencedirect.com/science/journal/00221694 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 38 N1 - Document feature - illus. N1 - Last updated - 2013-05-02 N1 - CODEN - JHYDA7 N1 - SubjectsTermNotLitGenreText - covariance analysis; data processing; finite element analysis; ground water; heterogeneous materials; hydraulic conductivity; mathematical methods; movement; porous materials; reservoir rocks; statistical analysis; stochastic processes DO - http://dx.doi.org/10.1016/j.jhydrol.2012.11.052 ER - TY - JOUR T1 - Can teleseismic m (sub b) be affected by rock damage around explosions? AN - 1371764209; 2013-049566 AB - Effects of rock damage on teleseismic m (sub b) are investigated with P wave synthetic seismograms using a moment dipole M (sub zz) as the equivalent elastic model for damage around buried explosions. Two manifestations of late-time damage, cavity rebound and bulking from block rotations, are represented by model decompositions into compensated linear vector dipole and monopole sources, respectively. For high-velocity media, P waves from damage destructively interfere with those from the explosion. This interference reduces the rate at which m (sub b) yield scales for a pure monopole source and provides a physical basis for observed scaling in hard rock, m (sub b) approximately 0.75 log[yield]. For over-buried explosions, such as the North Korean tests, P waves from damage are weaker, and higher scaling rates are expected than explosions conducted under standard containment conditions. Our results highlight a cautionary note of transporting the same m (sub b) -log[yield] relation between test sites to estimate yield when source phenomenology is likely to be very different. Abstract Copyright (2012), . American Geophysical Union. All Rights Reserved. JF - Geophysical Research Letters AU - Taylor, Steven R AU - Patton, Howard J Y1 - 2013/01/16/ PY - 2013 DA - 2013 Jan 16 SP - 100 EP - 104 PB - American Geophysical Union, Washington, DC VL - 40 IS - 1 SN - 0094-8276, 0094-8276 KW - seismograms KW - P-waves KW - body waves KW - explosions KW - engineering properties KW - igneous rocks KW - granites KW - stress KW - magnitude KW - damage KW - mechanical properties KW - elastic waves KW - teleseismic signals KW - depth KW - signals KW - plutonic rocks KW - propagation KW - seismic waves KW - nuclear explosions KW - earthquakes KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1371764209?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Can+teleseismic+m+%28sub+b%29+be+affected+by+rock+damage+around+explosions%3F&rft.au=Taylor%2C+Steven+R%3BPatton%2C+Howard+J&rft.aulast=Taylor&rft.aufirst=Steven&rft.date=2013-01-16&rft.volume=40&rft.issue=1&rft.spage=100&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2012GL054526 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 30 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2013-06-27 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - body waves; damage; depth; earthquakes; elastic waves; engineering properties; explosions; granites; igneous rocks; magnitude; mechanical properties; nuclear explosions; P-waves; plutonic rocks; propagation; seismic waves; seismograms; signals; stress; teleseismic signals DO - http://dx.doi.org/10.1029/2012GL054526 ER - TY - JOUR T1 - Dynamic hole blockade yields two-color quantum and classical light from dot-in-bulk nanocrystals. AN - 1273355027; 23252581 AB - Semiconductor nanocrystals (NCs) are an emerging class of color-tunable, solution-processable, room-temperature single-photon sources. Photon antibunching in NCs arises from suppression of multiphoton emission by nonradiative Auger recombination. Here, we demonstrate a new antibunching mechanism-dynamic Coulomb blockade-which allows for generating both quantum and classical light from the same NC without detrimental effects of Auger decay. This mechanism is realized in novel dot-in-bulk (DiB) nanostructures comprising a quantum-confined CdSe core overcoated with a thick, bulk-like CdS shell. The presence of one hole in the core suppresses the capture of the second hole forcing it to recombine in the shell region. Under weak excitation, these NCs emit red antibunched light (core emission). At higher pump levels they exhibit an additional green band (shell emission) with bulk-like, Poissonian photon statistics. The unusual versatility of these novel nanoscale light sources, that combine mutually correlated channels for quantum and classical emission and additionally allow for facile tunability of effective color, opens new interesting opportunities for a range of applications from quantum optics to sensing and nanoscale imaging. JF - Nano letters AU - Galland, Christophe AU - Brovelli, Sergio AU - Bae, Wan Ki AU - Padilha, Lazaro A AU - Meinardi, Francesco AU - Klimov, Victor I AD - Chemistry Division and Center for Advanced Solar Photophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. Y1 - 2013/01/09/ PY - 2013 DA - 2013 Jan 09 SP - 321 EP - 328 VL - 13 IS - 1 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1273355027?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nano+letters&rft.atitle=Dynamic+hole+blockade+yields+two-color+quantum+and+classical+light+from+dot-in-bulk+nanocrystals.&rft.au=Galland%2C+Christophe%3BBrovelli%2C+Sergio%3BBae%2C+Wan+Ki%3BPadilha%2C+Lazaro+A%3BMeinardi%2C+Francesco%3BKlimov%2C+Victor+I&rft.aulast=Galland&rft.aufirst=Christophe&rft.date=2013-01-09&rft.volume=13&rft.issue=1&rft.spage=321&rft.isbn=&rft.btitle=&rft.title=Nano+letters&rft.issn=1530-6992&rft_id=info:doi/10.1021%2Fnl3045316 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2013-06-05 N1 - Date created - 2013-01-09 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/nl3045316 ER - TY - JOUR T1 - Radionuclide transport during glacial cycles; comparison of two approaches for representing flow transients AN - 1769964522; 2016-017277 AB - The effect of future, transient ice sheet movement and permafrost development on transport of radionuclides from a proposed repository site is investigated using numerical groundwater flow and radionuclide transport modelling. Two different transport approaches are compared, both utilizing groundwater flow simulations of future climate conditions. The first transport approach uses steady-state particle trajectories representing temperate climate conditions, but modifies the transport velocity along the trajectories according to the changing climate. The second approach is pseudo-transient by performing particle tracking in each individual flow field representing a given time epoch. Two different climate sequences are analyzed. First, a simplified sequence is assessed in order to understand if the two different transport approaches yield significantly different breakthrough characteristics. Second, a sequence representing conditions relevant for real safety assessment applications is considered. Results indicate that the transport approach using fixed trajectories tends to significantly over predict breakthrough during permafrost conditions relative to the pseudo-transient approach. The major difference between the two approaches is related to discharge locations. The fixed trajectory approach yields discharge locations constant in time whereas the pseudo-transient approach is characterized by discharge centres moving in time according to the different climate conditions. Abstract Copyright (2013) Elsevier, B.V. JF - Physics and Chemistry of the Earth (2002) AU - Selroos, Jan-Olof AU - Cheng, Hua AU - Painter, Scott AU - Vidstrand, Patrik Y1 - 2013 PY - 2013 DA - 2013 SP - 32 EP - 45 PB - Elsevier, Kidlington VL - 64 SN - 1474-7065, 1474-7065 KW - transient methods KW - solute transport KW - permafrost KW - Western Europe KW - numerical models KW - glaciation KW - isotopes KW - Darcy's law KW - waste disposal sites KW - fluid flow KW - Europe KW - simulation KW - climate change KW - radioactive waste KW - ground water KW - Scandinavia KW - radioactive isotopes KW - transport KW - breakthrough curves KW - waste disposal KW - Sweden KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1769964522?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Physics+and+Chemistry+of+the+Earth+%282002%29&rft.atitle=Radionuclide+transport+during+glacial+cycles%3B+comparison+of+two+approaches+for+representing+flow+transients&rft.au=Selroos%2C+Jan-Olof%3BCheng%2C+Hua%3BPainter%2C+Scott%3BVidstrand%2C+Patrik&rft.aulast=Selroos&rft.aufirst=Jan-Olof&rft.date=2013-01-01&rft.volume=64&rft.issue=&rft.spage=32&rft.isbn=&rft.btitle=&rft.title=Physics+and+Chemistry+of+the+Earth+%282002%29&rft.issn=14747065&rft_id=info:doi/10.1016%2Fj.pce.2012.10.003 L2 - http://www.sciencedirect.com/science/journal/14747065 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2016-01-01 N1 - Number of references - 34 N1 - Document feature - illus. incl. 2 tables, sketch map N1 - Last updated - 2016-03-03 N1 - CODEN - PCEAAV N1 - SubjectsTermNotLitGenreText - breakthrough curves; climate change; Darcy's law; Europe; fluid flow; glaciation; ground water; isotopes; numerical models; permafrost; radioactive isotopes; radioactive waste; Scandinavia; simulation; solute transport; Sweden; transient methods; transport; waste disposal; waste disposal sites; Western Europe DO - http://dx.doi.org/10.1016/j.pce.2012.10.003 ER - TY - JOUR T1 - Update on development of the Potassium-Argon Laser Experiment (KArLE) instrument for in-situ geochronology AN - 1664434046; 2015-025125 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Cohen, Barbara A AU - Li, Z H AU - Miller, J S AU - Brinckerhoff, William B AU - Clegg, S M AU - Mahaffy, Paul R AU - Swindle, T D AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract No. 2363 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - laser-induced breakdown spectroscopy KW - development KW - asteroids KW - mass spectra KW - Mars KW - calibration KW - Cenozoic KW - chronology KW - noble gases KW - Mercury Planet KW - Potassium-Argon Laser Experiment instrument KW - KArLE instrument KW - spectra KW - quadrupole mass spectroscopy KW - in situ KW - Moon KW - alkali metals KW - mass spectroscopy KW - Paleogene KW - measurement KW - emission spectroscopy KW - terrestrial planets KW - planets KW - Tertiary KW - K/Ar KW - microscope methods KW - metals KW - potassium KW - Fish Canyon Tuff KW - spectroscopy KW - instruments KW - Oligocene KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664434046?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Update+on+development+of+the+Potassium-Argon+Laser+Experiment+%28KArLE%29+instrument+for+in-situ+geochronology&rft.au=Cohen%2C+Barbara+A%3BLi%2C+Z+H%3BMiller%2C+J+S%3BBrinckerhoff%2C+William+B%3BClegg%2C+S+M%3BMahaffy%2C+Paul+R%3BSwindle%2C+T+D%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Cohen&rft.aufirst=Barbara&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2363.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. N1 - Date revised - 2015-01-01 N1 - Number of references - 7 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Oct. 22, 2013 N1 - Last updated - 2015-03-19 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali metals; asteroids; calibration; Cenozoic; chronology; development; emission spectroscopy; Fish Canyon Tuff; in situ; instruments; K/Ar; KArLE instrument; laser-induced breakdown spectroscopy; Mars; mass spectra; mass spectroscopy; measurement; Mercury Planet; metals; microscope methods; Moon; noble gases; Oligocene; Paleogene; planets; potassium; Potassium-Argon Laser Experiment instrument; quadrupole mass spectroscopy; spectra; spectroscopy; terrestrial planets; Tertiary ER - TY - BOOK T1 - Magma-water interactions AN - 1629942781; 2014-093439 JF - Modeling volcanic processes; the physics and mathematics of volcanism AU - Wohletz, Ken AU - Zimanowski, Bernd AU - Buettner, Ralf Y1 - 2013 PY - 2013 DA - 2013 PB - Cambridge University Press, New York, NY SN - 9780521895439 KW - water KW - experimental studies KW - fragmentation KW - volcanic rocks KW - igneous rocks KW - magma-water interaction KW - data processing KW - water vapor KW - pillow lava KW - explosive eruptions KW - pyroclastics KW - volatiles KW - lava KW - volcanism KW - magmas KW - maars KW - digital simulation KW - phreatomagmatism KW - thermodynamic properties KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629942781?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/GeoRef&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=book&rft.jtitle=&rft.atitle=&rft.au=Wohletz%2C+Ken%3BZimanowski%2C+Bernd%3BBuettner%2C+Ralf&rft.aulast=Wohletz&rft.aufirst=Ken&rft.date=2013-01-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=9780521895439&rft.btitle=Magma-water+interactions&rft.title=Magma-water+interactions&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 80 N1 - PubXState - NY N1 - Document feature - illus. N1 - Last updated - 2014-12-04 ER - TY - JOUR T1 - Enhanced leakage at CCS sites; natural analogue study of wellbore CO (sub 2) -driven cold-water geysers AN - 1612268369; 2014-082348 AB - Geologic CO (sub 2) storage is one of the technologies for mitigating atmospheric CO (sub 2) emissions and subsequently global climate change. Adjacent to potential and current CO (sub 2) storage demonstration sites, various purposed wells including abandoned and/or monitoring wells are immensely distributed, which could serve as preferential leakage pathways. Here we present an in depth study of multiple wellbore CO (sub 2) -driven cold-water geysers as natural analogues to well failure at a CCS site. Fluid acceleration due to flashing of CO (sub 2) from depth enhances leakage compared to diffuse flow through faults. The eruption mechanisms create pressure gradients which can cause mixing between aquifers as seen at Crystal geyser. Gaseous CO (sub 2) occupation within these wells ranges 10-80% during an eruption. Emission of CO (sub 2) during an eruption is on the order of 10 (super 2) -10 (super 5) kg at rate of 4-20 m/s. Annual emission of CO (sub 2) is estimated to be 6406+ or -2460, 46.2+ or -12.9, 82.4+ or -6.7 tonnes for Crystal , Tenmile and Chimayo geyser, respectively. Geysering of CO (sub 2) gas from brine, compared to diffuse flow through faults, contains two components which enhance the leakage process; (1) flashing accelerates fluid flow (leakage) and (2) CO (sub 2) reaches the surface in the gas form. The emission of CO (sub 2) from Crystal geyser (6.4+ or -2.5 kt/yr) would easily exceed the leakage rate deemed acceptable by the IPCC (2005) (1% net stored CO (sub 2) per ky) at even the largest storage sites. Failure of the engineered CO (sub 2) storage sites could result in what we observe at CO (sub 2) -driven cold-water geysers introduced in this study. JF - Abstracts with Programs - Geological Society of America AU - Watson, Zachary T AU - Han, Weon Shik AU - Keating, Elizabeth H AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 175 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 12:Stratigraphy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612268369?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Enhanced+leakage+at+CCS+sites%3B+natural+analogue+study+of+wellbore+CO+%28sub+2%29+-driven+cold-water+geysers&rft.au=Watson%2C+Zachary+T%3BHan%2C+Weon+Shik%3BKeating%2C+Elizabeth+H%3BAnonymous&rft.aulast=Watson&rft.aufirst=Zachary&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=175&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper224429.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-10-16 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Nano pore evolutions of shale and coal during petroleum generation process using SANS and pyrolysis AN - 1549621042; 2014-057356 AB - This study aims to examine the changes of nano- to microscaled pores of shale (marine and lacustrine) and coal with petroleum generation, retaining and cracking. Pyrolysis was used to define oil and gas window, as well as study the compositions of expulsed and retained oil while small-angle neutron scattering (SANS) was used to characterize nano- to microscaled pores of residual source rocks. Oil windows are defined as 0.6-1.3%Ro for shale and 0.5-1.2%Ro for coal; wet gas window are 0.9-3.0% Ro for shale and 0.8-3.0% Ro for coal; dry gas windows are 1.3-3.6%Ro for both shale and coal. In oil window, marine shale oil shows mainly saturated and aromatic fractions, resins and less asphaltene. In gas window, higher saturated fractions is due to its higher stability. Coal oil shows dominant asphaltene fraction with higher aromatic HC, resin, asphaltene and rare saturated HC. Pore features corresponding to oil and gas windows by SANS show that shale and coal have unique pore features at the scale between 1 to 100 nm. Results also show that pore features change more significantly in coal relative to shale rock during hydrocarbon generation and expulsion from source rocks, presumably due to the much higher organic carbon content of the coal and unique HC fractional compositions (Fig. 1). Figure 1 SANS plot of shale and coal in early oil window (L, 0.4%Ro) and post gas window(H,3.8%Ro) as well as the corresponding hydrocarbon (HC) fractional compositions. JF - Mineralogical Magazine AU - Wang, Yunpeng AU - Ding, Mei AU - Liao, Lingling AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 2464 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - genesis KW - migration KW - sedimentary rocks KW - pyrolysis KW - shale KW - natural gas KW - coal KW - source rocks KW - petroleum KW - clastic rocks KW - porosity KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549621042?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Nano+pore+evolutions+of+shale+and+coal+during+petroleum+generation+process+using+SANS+and+pyrolysis&rft.au=Wang%2C+Yunpeng%3BDing%2C+Mei%3BLiao%2C+Lingling%3BAnonymous&rft.aulast=Wang&rft.aufirst=Yunpeng&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=2464&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.23 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Document feature - illus. N1 - Last updated - 2014-07-31 N1 - SubjectsTermNotLitGenreText - clastic rocks; coal; genesis; migration; natural gas; petroleum; porosity; pyrolysis; sedimentary rocks; shale; source rocks DO - http://dx.doi.org/10.1180/minmag.2013.077.5.23 ER - TY - JOUR T1 - A theory for the transport of kinetically sorbing solutes in heterogeneous sediments with multimodal conductivity and hierarchical organization across scales AN - 1549617897; 2014-059942 AB - Solute transport in subsurface environments is controlled by geologic heterogeneity over many scales. In reactive transport characterized by low Damkohler numbers, it is also controlled by the rate of kinetic mass transfer. A theory for the influence of sedimentary texture on the transport of kinetically sorbing solutes in heterogeneous porous formations is derived using the Lagrangian-based stochastic methodology. The resulting model represents the hierarchical organization of sedimentary textures and associated modes of log conductivity (K) for reactive hydrofacies through a hierarchical Markov Chain. The model characterizes kinetic sorption using a spatially uniform linear reversible rate expression. Our main interest is to investigate the relative effects of sorption kinetics and dispersion. Our analysis is focused on model parameters defined at each hierarchical level (scale) including the integral scales of K spatial correlation, the anisotropy ratios (ratio of the vertical conductivity integral scales to the horizontal counterpart), the indicator correlation scales, and the contrast in mean K between facies defined at different scales. Anisotropy ratios have negligible effect upon the longitudinal dispersion of sorbing solutes. Dispersion depends mostly on indicator correlation scales, integral scales, and the contrast of the mean conductivity between units at different scales. It is most sensitive to the contrast in mean K. JF - Abstracts with Programs - Geological Society of America AU - Soltanian, Mohamad Reza AU - Ritzi, Robert AU - Huang, Chaocheng AU - Dai, Zhenxue AU - Dominic, David F AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 773 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549617897?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=A+theory+for+the+transport+of+kinetically+sorbing+solutes+in+heterogeneous+sediments+with+multimodal+conductivity+and+hierarchical+organization+across+scales&rft.au=Soltanian%2C+Mohamad+Reza%3BRitzi%2C+Robert%3BHuang%2C+Chaocheng%3BDai%2C+Zhenxue%3BDominic%2C+David+F%3BAnonymous&rft.aulast=Soltanian&rft.aufirst=Mohamad&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=773&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper232984.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-31 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Evaluation of costs and methods for treating water extracted during carbon storage using produced water quality data AN - 1549617284; 2014-059859 AB - Extraction of in-situ water is one of the options for minimizing the impact of large-scale CO (sub 2) injection in saline aquifers or during enhanced oil recovery (EOR). The amount of water to be produced could be significant depending on in-situ conditions and injection parameters. Previously, we have shown that a variety of desalination technologies may be feasible depending upon water quality, temperature, and site conditions, using a system model, CO (sub 2) -PENS, for assessment of geologic CO (sub 2) storage operations. This integrated system model is designed to be used as a tool to determine effective water treatment/disposal options that predict various treatment processes and associated costs while taking into account the specifics of sequestration site parameters and operational conditions. Few system models exist to evaluate treatment methods and costs for produced waters. Here we utilize water quality data collected from a number of sites in New Mexico and Colorado to develop cost profiles for transport, treatment, and disposal of extracted waters. Methods used for water handling and treatment in the oil and gas industry are combined with methods used for treating brackish and saline waters for drinking water. Extraction results obtained from CO (sub 2) injection simulations demonstrate the applicability of the model to various time scales and fluid types and volumes extracted. We evaluate the effects of factors including the physical qualities of the water including temperature and density, pretreatment and desalination methods, concentrate disposal options, and transportation and storage of the water and brine concentrate wastes. These results have implications for understanding processes and costs for treating water extracted during carbon storage, during EOR, and fracture flowback scenarios. JF - Abstracts with Programs - Geological Society of America AU - Sullivan, Enid J AU - Pawar, Rajesh J AU - Chu, Shaoping AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 759 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549617284?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Evaluation+of+costs+and+methods+for+treating+water+extracted+during+carbon+storage+using+produced+water+quality+data&rft.au=Sullivan%2C+Enid+J%3BPawar%2C+Rajesh+J%3BChu%2C+Shaoping%3BAnonymous&rft.aulast=Sullivan&rft.aufirst=Enid&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=759&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper229638.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-31 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - A record of uranium-series transport in fractured, unsaturated tuff at Nopal I, Sierra Pena Blanca, Mexico AN - 1549617151; 2014-057707 AB - Studies of U-series disequilibria near uranium deposits can provide valuable information on the timing of actinide mobility over a range of spatial and temporal scales. In this study, we characterize the geochemical evolution of the Nopal I uranium ore deposit (Sierra Pena Blanca, Chihuahua, Mexico) in terms of mineral-fluid interactions as well as the role that vertical fractures play in U transport and retention. The Nopal I deposit is a possible analog for actinide transport from a nuclear waste repository in fractured, unsaturated tuff and an arid climate. Samples have been collected from a vertical drill core (PB-1b) that extends to a depth of 250 m below the surface. Three samples have been selected for initial study from the vertical fractures at depths of 8.5 m, 66.5 m and 191 m. Since a variety of minerals are present in the fine-grained fracture-fill materials, different colored fractions were selected from each sample. From these fractions we can evaluate U-Th isochrons for dating past actinide transport. Samples from fractures were dissolved and spiked with (super 229) Th and (super 233) U tracers. U and Th were separated from the rock matrix by ion exchange chromatography, and high-precision U-Th concentration and isotopic ratios are being measured by MC-TIMS and MC-ICP-MS. Our preliminary data show that uranium concentrations range from approximately 0.1- 0.8 wt.% and U/Th weight ratios range from approximately 40-400. The ore deposit contains approximately 0.6 wt.% U, therefore our results suggest that U has been mobile up to 200 m depth in the past. (super 234) U/ (super 238) U activity ratios in the fracture-filling materials range from 0.66 to 2.44 and illustrate a complex evolution consistent with interaction between groundwater enriched in (super 234) U and a tuff matrix that is depleted in (super 234) U due to recoil-related leaching. Preliminary closed-system ages determined from U-Th isochrons are >200 ka. Although mineral-fluid interaction is ongoing and more complex open system models are possible, the simplest interpretation of these data is that the fracture filling materials have remained closed with respect to U and Th mobility for >200 ka. These results confirm our prior U-series chronology studies of horizontal fractures at this site and also provide a baseline for more detailed mineral work on actinide mobility and retention using LA-MC-ICP-MS. JF - Abstracts with Programs - Geological Society of America AU - Denton, Joanna S AU - Goldstein, Steven J AU - Murrell, Michael T AU - Nunn, Andrew J AU - Hinrichs, Kimberly A AU - Amato, Ronald S AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 737 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549617151?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=A+record+of+uranium-series+transport+in+fractured%2C+unsaturated+tuff+at+Nopal+I%2C+Sierra+Pena+Blanca%2C+Mexico&rft.au=Denton%2C+Joanna+S%3BGoldstein%2C+Steven+J%3BMurrell%2C+Michael+T%3BNunn%2C+Andrew+J%3BHinrichs%2C+Kimberly+A%3BAmato%2C+Ronald+S%3BAnonymous&rft.aulast=Denton&rft.aufirst=Joanna&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=737&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper229383.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-31 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - The gradual burial of Yucca Mountain AN - 1549617107; 2014-057703 AB - The proposed high-level nuclear waste repository described in the 2008 DOE license application is located 200-250 m below the surface of Yucca Mountain (YM), a tilted fault block composed of 12-Ma densely welded tuff. On the basis of a stream-power erosion model Stuwe and others (2009) suggested that the repository horizon would be unroofed in 0.5-5.0 million years (m.y.). The model, which does not include local geomorphic or basin history, makes untenable assumptions that weathered debris is removed from the Amargosa Valley-Fortymile Wash closed basin and that base levels lower through time. More than 40 boreholes logged adjacent to Yucca Mountain record more than 11 m.y. of basin-fill depositional history. In 8 boreholes well-dated Pliocene and late Miocene basalts, interstratified with basin fill alluvium, indicate long-term aggradation rates in adjacent Crater Flat basin of 35 m/m.y. and 41 m/m.y. to the east and south of YM. Scores of boreholes in the southern Amargosa Valley do not contain detritus from YM volcanic rocks; therefore, nearly all debris shed off YM is located within 30 km of the mountain. The general baselevel has risen, not declined, about 400 m since erosion began in the late middle Miocene. Recent cosmogenic dating by Cl-36, Ne-21, and Be-10 indicate a vertical rock-weathering rate of about 2 m/m.y. on bedrock surfaces. Horizontal erosion rate of cliffs and uppermost hillslopes is about 10 m/m.y. Dated segments of the main YM cliff have been preserved for more than 250 k.y. Small volumes of debris mantle YM hillslopes and U-series-dated soils on older colluvium are commonly of middle Pleistocene age and as old as approximately 1 Ma. Because long-term erosion and aggradation rates integrate multiple climate cycles we believe that these long-term rates are good predictors of future rates of similar geomorphic processes. Based on our data, during the next 5 m.y. the highest point on Yucca Mountain crest may become about 10 m lower vertically, upper valley walls may recede 50-100 m horizontally, and continued aggradation will likely raise the baselevel on three sides of the mountain by 150-200 m. Yucca Mountain is downwasting very slowly, continues to be buried by its own waste, and will continue to do so as long as the present closed basin exists. JF - Abstracts with Programs - Geological Society of America AU - Whitney, John W AU - Perry, Frank AU - Rood, Dylan H AU - Spengler, Richard AU - Paces, James B AU - Finkel, Robert C AU - Harrington, Charles D AU - Buckingham, Susan E AU - Hanks, Thomas C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 736 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549617107?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=The+gradual+burial+of+Yucca+Mountain&rft.au=Whitney%2C+John+W%3BPerry%2C+Frank%3BRood%2C+Dylan+H%3BSpengler%2C+Richard%3BPaces%2C+James+B%3BFinkel%2C+Robert+C%3BHarrington%2C+Charles+D%3BBuckingham%2C+Susan+E%3BHanks%2C+Thomas+C%3BAnonymous&rft.aulast=Whitney&rft.aufirst=John&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=736&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper226608.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-31 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Plio-Pleistocene tectonism and its controls on sediment preservation in the southern Espanola Basin, Rio Grande Rift, north-central New Mexico AN - 1549617080; 2014-057492 AB - We investigate the relation between Plio-Pleistocene tectonic activity and sediment preservation in the largely west-tilted, southern Espanola Basin (SEB) of the Rio Grande rift, including the Santa Fe embayment (SFE). Here, an extensive angular unconformity underlies two coarse-grained, interfingering, clastic units: the Puye Fm (5.3-1.6 Ma), which includes an axial river facies but mostly consists of sediment shed from volcanic highlands west of the SEB, and the Ancha Fm (3?-1.3 Ma) to the southeast, eroded from the Sangre de Cristo Mtns. Tectonic subsidence in the hanging wall of the Pajarito fault (PF) near Los Alamos created a approximately 6 km-wide half-graben that preserved 300-600 m of Plio-Pleistocene deposits, including 332+ m of Puye Fm that thins to approximately 100 m towards the eastern margin of the half-graben. The Puye Fm thickens southward (from 98 to 274 m in 6 km) over a south-dipping ramp in the northern half of the half-graben. Puye Fm and interbedded basalts are subhorizontal and 150-300 m thick east of the half-graben, where the unconformity exhibits erosional relief. This package pinches out 19-22 km west of the PF, in an area where the unconformity is slightly tilted 0.5-2.0 degrees W. In its western extent, 4-30 m of Ancha Fm underlies exposed 2.7-2.4 Ma basalt flows, but it thickens eastward to 70-90 m in a synclinal axis near the center of the SFE. The synclinal axis parallels the La Bajada fault (LBF) and its western limb formed by flexural uplift along the LBF (Baldridge et al., 2001). The presence of 5-30 m-deep paleovalleys at the base of the Ancha Fm indicates erosion prior to approximately 3 Ma, when much of its corresponding area may have occupied the distal hanging wall ramp of the Santo Domingo Basin (SDB) to the southwest. Smith et al. (2001) interpret that the SDB "see-sawed" from west- to east-tilted ca. 2.6 Ma, after which faulting was concentrated along the LBF on its east side. This change likely enhanced tectonic subsidence along the syncline axis and explains the thickening and younging of the Ancha Fm eastward from the LBF into the syncline axis. West of Santa Fe, the NW strike of the Ancha Fm base contrasts with NE strikes of underlying Miocene strata. Other observations support the interpretation that Miocene structures in the SFE, such as the San Isidro Crossing fault and Rancho Viejo hinge zone, were relatively inactive in the Plio-Pleistocene. JF - Abstracts with Programs - Geological Society of America AU - Koning, Daniel J AU - Broxton, David E AU - Johnson, Peggy S AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 443 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549617080?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Plio-Pleistocene+tectonism+and+its+controls+on+sediment+preservation+in+the+southern+Espanola+Basin%2C+Rio+Grande+Rift%2C+north-central+New+Mexico&rft.au=Koning%2C+Daniel+J%3BBroxton%2C+David+E%3BJohnson%2C+Peggy+S%3BAnonymous&rft.aulast=Koning&rft.aufirst=Daniel&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=443&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper225480.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-31 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Stability of a mined geologic repository if subjected to seismic events AN - 1549616684; 2014-057712 AB - Engineering calculations using rock properties at Yucca Mountain have led to the conclusion that seismic events would cause only minor damage to tunnels in the major rock units. These conclusions cannot be tested directly with analogues, but their reasonableness can be assessed. Caves (some millions of years old) have been investigated in areas where strong ground motion has occurred many times. Damage to speleothems has been reported widely, but roof collapse is rare. For example, two caves in Israel are about 40 km from the Dead Sea transform (a 1000 km long fault zone), and have been subjected to 13 to 18 seismic episodes with estimated magnitudes of 7.6 to 8.2. These caves exhibit speleothem damage and minor roof collapse. Perhaps one extreme example of stability is provided by a cave in Italy that had incurred 1 meter of displacement, but no roof collapse. The record for anthropogenic underground openings spans a much shorter period of time than for natural openings, but it also attests to remarkable stability even in areas of strong seismicity. Thousands of tombs throughout Europe and the Middle East have been excavated in limestone and volcanic rock. Most of these are older than 2 ka. There are also several kilometers of tunnels in these same two rock types located within areas of strong seismicity, and these have not collapsed in more than 2,500 years. Several compilations of mines and tunnels have documented response to earthquakes during the last 200 years; reports of damage have been minimal. A few reports note heavy damage to surface structures from earthquakes that were not felt by miners working underground. Commonly, when damage has been reported, it was near the portal or in areas of shallow cover. Damage has been reported for tunnels displaced by faulting, but even in these cases, total collapse has not been reported. The analogue data agree with engineering calculations and strongly suggest that a geologic repository should survive seismic events, especially if tunnels were not driven across capable faults and were located deep underground. JF - Abstracts with Programs - Geological Society of America AU - Stuckless, John AU - Simmons, Ardyth M AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 738 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549616684?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Stability+of+a+mined+geologic+repository+if+subjected+to+seismic+events&rft.au=Stuckless%2C+John%3BSimmons%2C+Ardyth+M%3BAnonymous&rft.aulast=Stuckless&rft.aufirst=John&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=738&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper226513.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-31 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Where is the uncertainty? Decision analysis for environmental management AN - 1545410712; 2014-052795 AB - The uncertainties associated with subsurface flow and transport processes and their parameters are notoriously difficult to observe, measure, and characterize, causing poorly constrained and non-unique decision-analysis results. The subsurface uncertainties are heavily influenced by uncertainties related to properties of the geologic media where the groundwater flow and contaminant transport occur. Due to limited site data about the properties of the geologic media, decision analyses typically rely on model predictions, which are often poorly constrained as well. Currently, various techniques are commonly applied for data- and model-based decision analyses related groundwater contaminant sites. We will demonstrate the application of alternative techniques for evaluation of uncertainties associated with decision analyses. The techniques are applied to solve synthetic and real-world problems related to environmental management at the Los Alamos National Laboratory (LANL) site. The work utilizes the code MADS (Model Analysis & Decision Support; http://mads.lanl.gov). MADS is an open-source code designed as an integrated high-performance computational framework performing a wide range of model-based analyses for decision support. MADS includes a wide range model-analyses tools based on well established and newly developed computational techniques. JF - Abstracts with Programs - Geological Society of America AU - Vesselinov, Velimir AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 149 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1545410712?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Where+is+the+uncertainty%3F+Decision+analysis+for+environmental+management&rft.au=Vesselinov%2C+Velimir%3BAnonymous&rft.aulast=Vesselinov&rft.aufirst=Velimir&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=149&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper228468.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-17 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Sensitivity of carbonaceous aerosol simulations to aging schemes AN - 1545410528; 2014-052581 AB - Carbonaceous aerosols including organic carbon and black carbon have significant implications for both climate and air quality. In the current global climate or chemical transport models, a fixed hydrophobic-to-hydrophilic conversion lifetime for carbonaceous aerosol is generally assumed, which is usually around one day. We have implemented a new detailed aging scheme for carbonaceous aerosols in a chemical transport model (GEOS-Chem) to account for both the chemical oxidation and the physical condensation-coagulation effects, where the aging is affected by local atmospheric environment including atmospheric concentrations of water vapor, ozone, hydroxyl radical and sulfuric acid. The updated conversion lifetime exhibits large spatial and temporal variations with the global average calculated to be 4.3 days. The chemical aging effects are found to be strongest over the tropical regions driven by the low ozone concentrations and high humidity there. The conversion lifetime resulted from chemical aging generally decreases with altitude due to increases in ozone concentration and decreases in humidity. The condensation-coagulation effects are found to be most important for the high-latitude areas, in particular the polar regions, where the tau values are calculated to be up to 15 days. When both the chemical aging and condensation-coagulation effects are considered, the total atmospheric burdens and global average lifetimes of BC (OC) are calculated to increase by 52% (29%) compared to the control simulation. Model evaluation against data from multiple observation networks worldwide shows that the updated aging scheme improves model simulations of carbonaceous aerosols, especially for the remote regions. Further model sensitivity simulations focusing on the continental outflow of carbonaceous aerosols demonstrate that previous studies using the old aging scheme could have significantly underestimated the inter-continental transport of carbonaceous aerosols. JF - Mineralogical Magazine AU - Wu, Shiliang AU - Huang, Yaoxian AU - Dubey, Manvendra AU - French, Nancy AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 2512 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - carbonaceous composition KW - sulfuric acid KW - atmosphere KW - simulation KW - models KW - air quality KW - ozone KW - black carbon KW - transport KW - carbon KW - aerosols KW - organic carbon KW - inorganic acids KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1545410528?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Sensitivity+of+carbonaceous+aerosol+simulations+to+aging+schemes&rft.au=Wu%2C+Shiliang%3BHuang%2C+Yaoxian%3BDubey%2C+Manvendra%3BFrench%2C+Nancy%3BAnonymous&rft.aulast=Wu&rft.aufirst=Shiliang&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=2512&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.23 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-07-17 N1 - SubjectsTermNotLitGenreText - aerosols; air quality; atmosphere; black carbon; carbon; carbonaceous composition; inorganic acids; models; organic carbon; ozone; simulation; sulfuric acid; transport DO - http://dx.doi.org/10.1180/minmag.2013.077.5.23 ER - TY - JOUR T1 - Noble gas contents of unmelted Cap-Prudhomme "giant micrometeorites" AN - 1545409052; 2014-054647 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Olinger, C T AU - Maurette, M AU - Das, J P AU - Meshik, A AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 2278 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - isotopes KW - isotope ratios KW - Ne-22/Ne-20 KW - xenon KW - krypton KW - X-ray spectra KW - stable isotopes KW - size KW - EDS spectra KW - argon KW - micrometeorites KW - meteorites KW - Ar-40/Ar-36 KW - Antarctica KW - noble gases KW - neon KW - helium KW - spectra KW - He-4/He-3 KW - SEM data KW - Cap Prudhomme KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1545409052?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Noble+gas+contents+of+unmelted+Cap-Prudhomme+%22giant+micrometeorites%22&rft.au=Olinger%2C+C+T%3BMaurette%2C+M%3BDas%2C+J+P%3BMeshik%2C+A%3BAnonymous&rft.aulast=Olinger&rft.aufirst=C&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2278.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 9 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Jan. 17, 2014 N1 - Last updated - 2014-07-17 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Antarctica; Ar-40/Ar-36; argon; Cap Prudhomme; EDS spectra; He-4/He-3; helium; isotope ratios; isotopes; krypton; meteorites; micrometeorites; Ne-22/Ne-20; neon; noble gases; SEM data; size; spectra; stable isotopes; X-ray spectra; xenon ER - TY - JOUR T1 - Summary of the Mars Science Laboratory rover simulation at the Haughton impact structure AN - 1545408992; 2014-054616 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Gallegos, Z E AU - Newsom, H E AU - Ollila, A M AU - Berger, J AU - Lanza, N L AU - Clegg, S M AU - Wiens, R C AU - Vaniman, D T AU - McInroy, R E AU - King, P L AU - Osinski, G R AU - Gellert, R AU - Lee, P AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 2557 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - impact features KW - Mars KW - rovers KW - periglacial features KW - education KW - simulation KW - metasomatism KW - exploration KW - terrestrial planets KW - planets KW - Canada KW - Nunavut KW - natural analogs KW - Mars Science Laboratory KW - Haughton impact structure KW - testing KW - impact craters KW - hydrothermal alteration KW - polygons KW - instruments KW - field studies KW - cameras KW - 23:Geomorphology KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1545408992?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Summary+of+the+Mars+Science+Laboratory+rover+simulation+at+the+Haughton+impact+structure&rft.au=Gallegos%2C+Z+E%3BNewsom%2C+H+E%3BOllila%2C+A+M%3BBerger%2C+J%3BLanza%2C+N+L%3BClegg%2C+S+M%3BWiens%2C+R+C%3BVaniman%2C+D+T%3BMcInroy%2C+R+E%3BKing%2C+P+L%3BOsinski%2C+G+R%3BGellert%2C+R%3BLee%2C+P%3BAnonymous&rft.aulast=Gallegos&rft.aufirst=Z&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2557.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 5 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Jan. 16, 2014 N1 - Last updated - 2014-07-17 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - cameras; Canada; education; exploration; field studies; Haughton impact structure; hydrothermal alteration; impact craters; impact features; instruments; Mars; Mars Science Laboratory; metasomatism; natural analogs; Nunavut; periglacial features; planets; polygons; rovers; simulation; terrestrial planets; testing ER - TY - JOUR T1 - Tephrostratigraphic and geochemical investigation of early Pleistocene silicic tephra, middle Awash region, Afar Rift, Ethiopia AN - 1545408625; 2014-055089 AB - The Middle Awash region of the Afar Rift, Ethiopia has experienced a protracted history of faulting, basin development, sedimentation, and volcanism. These processes led to the preservation and subsequent exposure of a rich hominid evolutionary record spanning at least six million years. Local and regional volcanic activity contributed to the Middle Awash stratigraphic record with proximal and distal silicic tephra serving as essential chronostratigraphic tools. Faulting and erosion have exposed the stratigraphic and paleontological resources and created a landscape characterized by discontinuous outcrops of intercalated sedimentary and volcanic horizons. The tephra record becomes a principal means to link these non-contiguous stratigraphic packages. Correlation is accomplished primarily through geochemical characterization of silicic volcanic glass, as this constituent typically provides a unique fingerprint of the responsible eruption or magma system. Between 3.5 and 1.5 Ma, Afar and Main Ethiopian Rift silicic volcanism contributed numerous tephra units to the Middle Awash geologic record. However, the period between approximately 2.5 and 1.8 Ma contains a dearth of documented large and widely dispersed eruptions. We report here the results of tephrostratigraphic and geochemical studies focused on a set of localities that preserve a record of deposition and volcanic input during this time interval. Correlations between deposits are suggested by field studies and further explored using grain-specific and purified bulk glass major and trace element geochemistry. This approach allows for (1) correlation of many separate outcrops into several distinct tephra horizons spanning >20 km of aerial extent and incorporating multiple important fossil hominid and archeological localities, (2) correlation of multiple tephra horizons to previously studied deposits in other portions of the Middle Awash, and (3) correlation of multiple tephra horizons with deposits described in the Omo and Turkana regions of Ethiopia and Kenya, respectively. The latter two results help to better frame the Pleistocene chronostratigraphic record of the Middle Awash and also provide evidence for the eruption of large silicic magma systems in the northern East African Rift system during the approximately 2.5 to 1.8 Ma time period. JF - Abstracts with Programs - Geological Society of America AU - Walkup, Laura C AU - Hart, William K AU - WoldeGabriel, Giday AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 465 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1545408625?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Tephrostratigraphic+and+geochemical+investigation+of+early+Pleistocene+silicic+tephra%2C+middle+Awash+region%2C+Afar+Rift%2C+Ethiopia&rft.au=Walkup%2C+Laura+C%3BHart%2C+William+K%3BWoldeGabriel%2C+Giday%3BAnonymous&rft.aulast=Walkup&rft.aufirst=Laura&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=465&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper225513.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-17 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Compositions determined by ChemCam along Curiosity's traverse from Bradbury Station to Glenelg in Gale Crater, Mars AN - 1542646769; 2014-047758 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Wiens, R C AU - Maurice, S AU - Sautter, V AU - Blaney, D AU - Bridges, N T AU - Clark, B AU - Clegg, S AU - Dromart, G AU - d'Uston, C AU - Fabre, C AU - Gasnault, O AU - Herkenhoff, K E AU - Langevin, Y AU - Mangold, Nicolas AU - Mauchian, P AU - McKay, C AU - Newsom, H AU - Vaniman, D AU - Anderson, R AU - Baroukh, J AU - Barraclough, B AU - Bender, S AU - Berger, G AU - Blank, J AU - Cousin, A AU - Cros, A AU - Deflores, L AU - Delapp, D AU - Donny, C AU - Forni, O AU - Gondet, B AU - Guillemot, P AU - Johnstone, S AU - Lacour, J L AU - Lafaille, V AU - Lanza, N AU - Lasue, J AU - Le Mouelic, S AU - Lewin, E AU - Lorginy, E AU - Melikechi, N AU - Meslin, P Y AU - Mezzacappa, A AU - Nelson, T AU - Ollila, A AU - Perez, R AU - Pinet, P AU - Saccoccio, M AU - Schroeder, S AU - Sirven, J B AU - Tokar, R AU - Toplis, M J AU - Yana, C AU - Dyar, M Darby AU - Ehlmann, Bethany L AU - Johnson, R AU - Leveille, R AU - Moores, J AU - Bridges, J C AU - Fisk, M R AU - Grotzinger, J P AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 1363 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - silicates KW - Glenelg KW - igneous rocks KW - geotraverses KW - pebbles KW - Mars KW - landing sites KW - iron KW - Gale Crater KW - sedimentary rocks KW - mineral composition KW - silica KW - Curiosity Rover KW - sediments KW - ChemCam KW - framework silicates KW - chemical composition KW - rocks KW - soils KW - clastic sediments KW - textures KW - Bradbury Landing KW - conglomerate KW - terrestrial planets KW - planets KW - porphyritic texture KW - metals KW - Mars Science Laboratory KW - feldspar group KW - clastic rocks KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542646769?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Compositions+determined+by+ChemCam+along+Curiosity%27s+traverse+from+Bradbury+Station+to+Glenelg+in+Gale+Crater%2C+Mars&rft.au=Wiens%2C+R+C%3BMaurice%2C+S%3BSautter%2C+V%3BBlaney%2C+D%3BBridges%2C+N+T%3BClark%2C+B%3BClegg%2C+S%3BDromart%2C+G%3Bd%27Uston%2C+C%3BFabre%2C+C%3BGasnault%2C+O%3BHerkenhoff%2C+K+E%3BLangevin%2C+Y%3BMangold%2C+Nicolas%3BMauchian%2C+P%3BMcKay%2C+C%3BNewsom%2C+H%3BVaniman%2C+D%3BAnderson%2C+R%3BBaroukh%2C+J%3BBarraclough%2C+B%3BBender%2C+S%3BBerger%2C+G%3BBlank%2C+J%3BCousin%2C+A%3BCros%2C+A%3BDeflores%2C+L%3BDelapp%2C+D%3BDonny%2C+C%3BForni%2C+O%3BGondet%2C+B%3BGuillemot%2C+P%3BJohnstone%2C+S%3BLacour%2C+J+L%3BLafaille%2C+V%3BLanza%2C+N%3BLasue%2C+J%3BLe+Mouelic%2C+S%3BLewin%2C+E%3BLorginy%2C+E%3BMelikechi%2C+N%3BMeslin%2C+P+Y%3BMezzacappa%2C+A%3BNelson%2C+T%3BOllila%2C+A%3BPerez%2C+R%3BPinet%2C+P%3BSaccoccio%2C+M%3BSchroeder%2C+S%3BSirven%2C+J+B%3BTokar%2C+R%3BToplis%2C+M+J%3BYana%2C+C%3BDyar%2C+M+Darby%3BEhlmann%2C+Bethany+L%3BJohnson%2C+R%3BLeveille%2C+R%3BMoores%2C+J%3BBridges%2C+J+C%3BFisk%2C+M+R%3BGrotzinger%2C+J+P%3BAnonymous&rft.aulast=Wiens&rft.aufirst=R&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1363.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 11 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Nov. 8, 2013 N1 - Last updated - 2014-11-13 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Bradbury Landing; ChemCam; chemical composition; clastic rocks; clastic sediments; conglomerate; Curiosity Rover; feldspar group; framework silicates; Gale Crater; geotraverses; Glenelg; igneous rocks; iron; landing sites; Mars; Mars Science Laboratory; metals; mineral composition; pebbles; planets; porphyritic texture; rocks; sedimentary rocks; sediments; silica; silicates; soils; terrestrial planets; textures ER - TY - JOUR T1 - Mars Science Laboratory; first 100 sols monitoring the atmosphere and environment within Gale Crater AN - 1542646742; 2014-047717 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Vasavada, A R AU - Blake, D F AU - Crisp, J AU - Edgett, K S AU - Gellert, R AU - Gomez-Elvira, J AU - Grotzinger, J P AU - Hassler, D AU - Mahaffy, P R AU - Malin, M C AU - Mitrofanov, I G AU - Meyer, M AU - Wiens, R C AU - Maki, J N AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 1191 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - eolian features KW - imagery KW - isotopes KW - aliphatic hydrocarbons KW - Mars KW - stable isotopes KW - temperature KW - Gale Crater KW - carbon dioxide KW - atmospheric circulation KW - Curiosity Rover KW - sediments KW - cosmic rays KW - chemical composition KW - meteorology KW - climate KW - water KW - monitoring KW - methane KW - clastic sediments KW - atmosphere KW - alkanes KW - terrestrial planets KW - planets KW - organic compounds KW - humidity KW - neutrons KW - hydrogen KW - dust KW - Mars Science Laboratory KW - hydrocarbons KW - winds KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542646742?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Mars+Science+Laboratory%3B+first+100+sols+monitoring+the+atmosphere+and+environment+within+Gale+Crater&rft.au=Vasavada%2C+A+R%3BBlake%2C+D+F%3BCrisp%2C+J%3BEdgett%2C+K+S%3BGellert%2C+R%3BGomez-Elvira%2C+J%3BGrotzinger%2C+J+P%3BHassler%2C+D%3BMahaffy%2C+P+R%3BMalin%2C+M+C%3BMitrofanov%2C+I+G%3BMeyer%2C+M%3BWiens%2C+R+C%3BMaki%2C+J+N%3BAnonymous&rft.aulast=Vasavada&rft.aufirst=A&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1191.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 3 N1 - PubXState - TX N1 - SuppNotes - Accessed on Nov. 4, 2013 N1 - Last updated - 2014-07-04 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - aliphatic hydrocarbons; alkanes; atmosphere; atmospheric circulation; carbon dioxide; chemical composition; clastic sediments; climate; cosmic rays; Curiosity Rover; dust; eolian features; Gale Crater; humidity; hydrocarbons; hydrogen; imagery; instruments; isotopes; Mars; Mars Science Laboratory; meteorology; methane; monitoring; neutrons; organic compounds; planets; sediments; stable isotopes; temperature; terrestrial planets; water; winds ER - TY - JOUR T1 - Chemical composition of four shergottites from Northwest Africa (NWA 2800, NWA 5214, NWA 5990, NWA 6342) AN - 1542646412; 2014-047779 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Yang, S Y AU - Humayun, M AU - Jefferson, G AU - Fields, D AU - Righter, K AU - Irving, A J AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 1738 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - Northwest Africa Meteorites KW - stony meteorites KW - laser methods KW - Martian meteorites KW - mass spectra KW - Los Angeles Meteorite KW - Elephant Moraine Meteorites KW - SNC Meteorites KW - meteorites KW - EETA 79001 KW - whole rock KW - major elements KW - Y 000097 KW - spectra KW - rare earths KW - trace elements KW - chemical composition KW - NWA 2800 KW - Yamato Meteorites KW - laser ablation KW - Y 980459 KW - achondrites KW - ICP mass spectra KW - shergottite KW - NWA 6342 KW - metals KW - Zagami Meteorite KW - NWA 5990 KW - NWA 5214 KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542646412?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Chemical+composition+of+four+shergottites+from+Northwest+Africa+%28NWA+2800%2C+NWA+5214%2C+NWA+5990%2C+NWA+6342%29&rft.au=Yang%2C+S+Y%3BHumayun%2C+M%3BJefferson%2C+G%3BFields%2C+D%3BRighter%2C+K%3BIrving%2C+A+J%3BAnonymous&rft.aulast=Yang&rft.aufirst=S&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1738.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 8 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Nov. 14, 2013 N1 - Last updated - 2014-07-04 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - achondrites; chemical composition; EETA 79001; Elephant Moraine Meteorites; ICP mass spectra; laser ablation; laser methods; Los Angeles Meteorite; major elements; Martian meteorites; mass spectra; metals; meteorites; Northwest Africa Meteorites; NWA 2800; NWA 5214; NWA 5990; NWA 6342; rare earths; shergottite; SNC Meteorites; spectra; stony meteorites; trace elements; whole rock; Y 000097; Y 980459; Yamato Meteorites; Zagami Meteorite ER - TY - JOUR T1 - Soil diversity along Bradbury-Glenelg traverse AN - 1542646040; 2014-047760 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Meslin, P Y AU - Cousin, A AU - Berger, G AU - Forni, O AU - Gasnault, O AU - Lasue, J AU - Mangold, N AU - Schroeder, S AU - Maurice, S AU - Wiens, R C AU - Vaniman, D AU - Anderson, R AU - Blaney, D AU - Bridges, N T AU - Clark, B AU - Clegg, S AU - Delapp, D AU - Ehlmann, Bethany L AU - Fabre, C AU - Lanza, N AU - Lewin, E AU - Melikechi, N AU - Mezzacappa, A AU - Newsom, H AU - Ollila, A AU - Renno, N AU - Sautter, V AU - d'Uston, C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 2023 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - Glenelg KW - geotraverses KW - Mars KW - variations KW - emission spectra KW - size distribution KW - major elements KW - LIBS spectra KW - ChemCam KW - spectra KW - heterogeneity KW - rocks KW - soils KW - granulometry KW - principal components analysis KW - grain size KW - Bradbury Landing KW - statistical analysis KW - depth KW - least-squares analysis KW - terrestrial planets KW - planets KW - hydration KW - hydrogen KW - classification KW - unconsolidated materials KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542646040?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Soil+diversity+along+Bradbury-Glenelg+traverse&rft.au=Meslin%2C+P+Y%3BCousin%2C+A%3BBerger%2C+G%3BForni%2C+O%3BGasnault%2C+O%3BLasue%2C+J%3BMangold%2C+N%3BSchroeder%2C+S%3BMaurice%2C+S%3BWiens%2C+R+C%3BVaniman%2C+D%3BAnderson%2C+R%3BBlaney%2C+D%3BBridges%2C+N+T%3BClark%2C+B%3BClegg%2C+S%3BDelapp%2C+D%3BEhlmann%2C+Bethany+L%3BFabre%2C+C%3BLanza%2C+N%3BLewin%2C+E%3BMelikechi%2C+N%3BMezzacappa%2C+A%3BNewsom%2C+H%3BOllila%2C+A%3BRenno%2C+N%3BSautter%2C+V%3Bd%27Uston%2C+C%3BAnonymous&rft.aulast=Meslin&rft.aufirst=P&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2023.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 15 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Nov. 8, 2013 N1 - Last updated - 2014-11-13 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Bradbury Landing; ChemCam; classification; depth; emission spectra; geotraverses; Glenelg; grain size; granulometry; heterogeneity; hydration; hydrogen; least-squares analysis; LIBS spectra; major elements; Mars; planets; principal components analysis; rocks; size distribution; soils; spectra; statistical analysis; terrestrial planets; unconsolidated materials; variations ER - TY - JOUR T1 - Giant convecting mudballs of the early solar system AN - 1542645672; 2014-047703 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Bland, P A AU - Travis, B J AU - Dyl, K A AU - Schubert, G AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 1447 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - water KW - CI chondrites KW - stony meteorites KW - numerical models KW - asteroids KW - closed systems KW - matrix KW - suspended materials KW - carbonaceous chondrites KW - convection KW - hydrothermal conditions KW - early solar system KW - aqueous alteration KW - meteorites KW - viscosity KW - open systems KW - fine-grained materials KW - CM chondrites KW - heterogeneity KW - chondrites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542645672?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Giant+convecting+mudballs+of+the+early+solar+system&rft.au=Bland%2C+P+A%3BTravis%2C+B+J%3BDyl%2C+K+A%3BSchubert%2C+G%3BAnonymous&rft.aulast=Bland&rft.aufirst=P&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1447.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 17 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Nov. 4, 2013 N1 - Last updated - 2014-07-04 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - aqueous alteration; asteroids; carbonaceous chondrites; chondrites; CI chondrites; closed systems; CM chondrites; convection; early solar system; fine-grained materials; heterogeneity; hydrothermal conditions; matrix; meteorites; numerical models; open systems; stony meteorites; suspended materials; viscosity; water ER - TY - JOUR T1 - Surface features and brine convection in the Martian near-surface AN - 1542644937; 2014-047827 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Travis, B J AU - Feldman, William C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 2820 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - Mars KW - Amazonis Planitia KW - periglacial features KW - salinity KW - simulation KW - geothermal systems KW - Elysium KW - surface features KW - Athabasca Valles KW - polygons KW - numerical models KW - three-dimensional models KW - elevation KW - mounds KW - deformation KW - convection KW - two-dimensional models KW - terrestrial planets KW - planets KW - contraction KW - natural analogs KW - brines KW - Cerberus Fossae KW - glacial geology KW - patterned ground KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542644937?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Surface+features+and+brine+convection+in+the+Martian+near-surface&rft.au=Travis%2C+B+J%3BFeldman%2C+William+C%3BAnonymous&rft.aulast=Travis&rft.aufirst=B&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2820.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 10 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Nov. 21, 2013 N1 - Last updated - 2014-07-04 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Amazonis Planitia; Athabasca Valles; brines; Cerberus Fossae; contraction; convection; deformation; elevation; Elysium; geothermal systems; glacial geology; Mars; mounds; natural analogs; numerical models; patterned ground; periglacial features; planets; polygons; salinity; simulation; surface features; terrestrial planets; three-dimensional models; two-dimensional models ER - TY - JOUR T1 - Mars Science Laboratory; first 100 sols of geologic and geochemical exploration from Bradbury Landing to Glenelg AN - 1542644813; 2014-047709 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Grotzinger, J P AU - Blake, D F AU - Crisp, J AU - Edgett, K S AU - Gellert, R AU - Gomez-Elvira, J AU - Hassler, D AU - Mahaffy, P R AU - Malin, M C AU - Mitrofanov, I G AU - Meyer, M AU - Vasavada, A AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 1259 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - imagery KW - Glenelg KW - volcanic rocks KW - igneous rocks KW - Mars KW - mapping KW - landing sites KW - sedimentary rocks KW - mineral composition KW - Curiosity Rover KW - chemical composition KW - basaltic composition KW - rocks KW - soils KW - Peace Vallis KW - bedrock KW - Bradbury Landing KW - Rocknest KW - conglomerate KW - gases KW - terrestrial planets KW - planets KW - Mars Science Laboratory KW - clastic rocks KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542644813?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Mars+Science+Laboratory%3B+first+100+sols+of+geologic+and+geochemical+exploration+from+Bradbury+Landing+to+Glenelg&rft.au=Grotzinger%2C+J+P%3BBlake%2C+D+F%3BCrisp%2C+J%3BEdgett%2C+K+S%3BGellert%2C+R%3BGomez-Elvira%2C+J%3BHassler%2C+D%3BMahaffy%2C+P+R%3BMalin%2C+M+C%3BMitrofanov%2C+I+G%3BMeyer%2C+M%3BVasavada%2C+A%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Grotzinger&rft.aufirst=J&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1259.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 17 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Nov. 4, 2013 N1 - Last updated - 2014-11-13 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - basaltic composition; bedrock; Bradbury Landing; chemical composition; clastic rocks; conglomerate; Curiosity Rover; gases; Glenelg; igneous rocks; imagery; landing sites; mapping; Mars; Mars Science Laboratory; mineral composition; Peace Vallis; planets; Rocknest; rocks; sedimentary rocks; soils; terrestrial planets; volcanic rocks ER - TY - JOUR T1 - Apatite and merrillite from Martian meteorite NWA 7034 AN - 1542644652; 2014-047783 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Santos, A R AU - Agee, C B AU - McCubbin, F M AU - Shearer, C K AU - Sharp, Z D AU - Zimmer, M AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 2601 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - Northwest Africa Meteorites KW - stony meteorites KW - ion probe data KW - Martian meteorites KW - halogens KW - mass spectra KW - fluid phase KW - metasomatism KW - melts KW - electron probe data KW - meteorites KW - NWA 7034 KW - fluorine KW - spectra KW - rare earths KW - europium KW - water KW - chlorine KW - apatite KW - textures KW - matrix KW - phosphates KW - clasts KW - achondrites KW - hydroxyl ion KW - volatiles KW - merrillite KW - metals KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542644652?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Apatite+and+merrillite+from+Martian+meteorite+NWA+7034&rft.au=Santos%2C+A+R%3BAgee%2C+C+B%3BMcCubbin%2C+F+M%3BShearer%2C+C+K%3BSharp%2C+Z+D%3BZimmer%2C+M%3BAnonymous&rft.aulast=Santos&rft.aufirst=A&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2601.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 10 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Nov. 14, 2013 N1 - Last updated - 2014-07-04 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - achondrites; apatite; chlorine; clasts; electron probe data; europium; fluid phase; fluorine; halogens; hydroxyl ion; ion probe data; Martian meteorites; mass spectra; matrix; melts; merrillite; metals; metasomatism; meteorites; Northwest Africa Meteorites; NWA 7034; phosphates; rare earths; spectra; stony meteorites; textures; volatiles; water ER - TY - JOUR T1 - Making minerals in contact metamorphic aureoles AN - 1542644279; 2014-050606 AB - During metamorphism, heat and mass transport interact in a series of feedbacks that drive forces controlling the nucleation, growth, dissolution and transformation of minerals in the host rocks surrounding an igneous intrusion. As the minerals respond to the thermal, baric and chemical changes in their local rock environment, they leave evidence of these conditions in their mineral assemblages, textures and/or mineral chemistry. Consequences of such feedbacks can be ascertained using 4-D numerical models of heat and mass transport within these environments. Experiments indicate that temperature (T)-pressure (P)-fluid flux conditions can be divided into three primary episodes: (1) an early conductive heating phase with low fluid flux as temperatures rise to near peak conditions; (2) a main stage convective heating/cooling event as peak Ts are attained with maximum fluid flux; and (3) a late stage convective cooling event when fluxes and Ts return to ambient conditions. Each of these stages exerts control on mineral formation. When computed T-t paths within the aureole are combined with irreversible models of minerals nucleation and growth, specific patterns of minerals develop in response to the system's feedbacks. For example, during stage 1 rapid heating, reaction overstepping and cooling near the intrusion produces abundant nucleation and growth of minerals that are stable within 50 degrees C of the T excursion resulting in rocks with a limited crystal size distribution. Almost no growth of minerals occurs from overstepped metastable reactions. During stage 2, advective heat transport produces additional nucleation and growth in minerals formed from stage 1 metastable reactions. In the far field, minerals grow on nuclei that formed from overstepping stable reactions. Stage 3 produces additional growth and/or retrograde reactions and a zone of retrograde pseudomorphs along the flow path before Ts return to steady state. Comparison of rocks with our calculations suggests that mineral textures provide evidence of the relative impact of each stage. Final textures are path dependent. Feedbacks that produce distinctive textures and mineral assemblages within these rock systems can be critical to the interpretation of the metamorphic and hydrothermal events and the mineral patterns they produce in aureoles. JF - Abstracts with Programs - Geological Society of America AU - Dutrow, Barbara L AU - Foster, C T AU - Gable, Carl W AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 81 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542644279?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Making+minerals+in+contact+metamorphic+aureoles&rft.au=Dutrow%2C+Barbara+L%3BFoster%2C+C+T%3BGable%2C+Carl+W%3BAnonymous&rft.aulast=Dutrow&rft.aufirst=Barbara&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=81&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper226505.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-07-04 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - ChemCam analysis of conglomerates at Bradbury site, Mars AN - 1542643909; 2014-047712 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Mangold, Nicolas AU - Forni, O AU - Ollila, A AU - Anderson, R AU - Berger, G AU - Bridges, J C AU - Clegg, S AU - Cousin, A AU - Dietrich, W E AU - Dromart, G AU - Gupta, S AU - Lewin, E AU - Fabre, C AU - Gasnault, O AU - Herkenhoff, K E AU - Le Mouelic, S AU - Meslin, P Y AU - Sautter, V AU - Wiens, R C AU - Williams, R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 1267 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - silicates KW - hydrates KW - imagery KW - partial least squares analysis KW - enrichment KW - Mars KW - emission spectra KW - sedimentary rocks KW - LIBS spectra KW - ChemCam KW - framework silicates KW - spectra KW - cement KW - chemical composition KW - depletion KW - independent component analysis KW - Bradbury Landing KW - statistical analysis KW - clasts KW - conglomerate KW - terrestrial planets KW - aqueous alteration KW - planets KW - hydrogen KW - feldspar group KW - clastic rocks KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542643909?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=ChemCam+analysis+of+conglomerates+at+Bradbury+site%2C+Mars&rft.au=Mangold%2C+Nicolas%3BForni%2C+O%3BOllila%2C+A%3BAnderson%2C+R%3BBerger%2C+G%3BBridges%2C+J+C%3BClegg%2C+S%3BCousin%2C+A%3BDietrich%2C+W+E%3BDromart%2C+G%3BGupta%2C+S%3BLewin%2C+E%3BFabre%2C+C%3BGasnault%2C+O%3BHerkenhoff%2C+K+E%3BLe+Mouelic%2C+S%3BMeslin%2C+P+Y%3BSautter%2C+V%3BWiens%2C+R+C%3BWilliams%2C+R%3BAnonymous&rft.aulast=Mangold&rft.aufirst=Nicolas&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1267.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Nov. 4, 2013 N1 - Last updated - 2014-07-04 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - aqueous alteration; Bradbury Landing; cement; ChemCam; chemical composition; clastic rocks; clasts; conglomerate; depletion; emission spectra; enrichment; feldspar group; framework silicates; hydrates; hydrogen; imagery; independent component analysis; LIBS spectra; Mars; partial least squares analysis; planets; sedimentary rocks; silicates; spectra; statistical analysis; terrestrial planets ER - TY - JOUR T1 - Abiotically formed redox interfaces in basalt sand; a Mars habitat of interest AN - 1542642858; 2014-049811 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Popa, Radu AU - Fisk, M R AU - Meslin, P Y AU - Lasue, J AU - Leveille, R AU - Goetz, W AU - Madsen, M B AU - Bridges, N T AU - Renno, N AU - Rubin, D AU - Wiens, R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 1442 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - silicates KW - volcanic rocks KW - igneous rocks KW - astrobiology KW - olivine group KW - Mars KW - manganese KW - iron KW - Gale Crater KW - energy sources KW - olivine KW - basalts KW - orthosilicates KW - interfaces KW - Eh KW - water KW - soils KW - oxidation KW - chemolithotrophic taxa KW - Rocknest KW - ferrous iron KW - terrestrial planets KW - nesosilicates KW - planets KW - habitat KW - abiotic processes KW - metals KW - Mars Science Laboratory KW - Mount Sharp KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542642858?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Abiotically+formed+redox+interfaces+in+basalt+sand%3B+a+Mars+habitat+of+interest&rft.au=Popa%2C+Radu%3BFisk%2C+M+R%3BMeslin%2C+P+Y%3BLasue%2C+J%3BLeveille%2C+R%3BGoetz%2C+W%3BMadsen%2C+M+B%3BBridges%2C+N+T%3BRenno%2C+N%3BRubin%2C+D%3BWiens%2C+R%3BAnonymous&rft.aulast=Popa&rft.aufirst=Radu&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1442.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetry science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 5 N1 - PubXState - TX N1 - SuppNotes - Accessed on Nov. 8, 2013 N1 - Last updated - 2014-07-04 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - abiotic processes; astrobiology; basalts; chemolithotrophic taxa; Eh; energy sources; ferrous iron; Gale Crater; habitat; igneous rocks; interfaces; iron; manganese; Mars; Mars Science Laboratory; metals; Mount Sharp; nesosilicates; olivine; olivine group; orthosilicates; oxidation; planets; Rocknest; silicates; soils; terrestrial planets; volcanic rocks; water ER - TY - JOUR T1 - Habitability of transgressing Mars dunes AN - 1542642720; 2014-049812 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Fisk, Martin AU - Popa, Radu AU - Bridges, N T AU - Renno, N AU - Mischna, M AU - Moores, J AU - Wiens, R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Paper 1434 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - dunes KW - oxygen KW - moisture KW - astrobiology KW - Mars KW - iron KW - nitrogen KW - Gale Crater KW - ferric iron KW - chemical reactions KW - energy sources KW - electromagnetic radiation KW - mixing KW - carbon KW - reduction KW - organic carbon KW - recycling KW - oxidation KW - Rocknest KW - ultraviolet radiation KW - geochemical cycle KW - ferrous iron KW - terrestrial planets KW - nutrients KW - planets KW - habitat KW - metals KW - brines KW - Mars Science Laboratory KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542642720?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Habitability+of+transgressing+Mars+dunes&rft.au=Fisk%2C+Martin%3BPopa%2C+Radu%3BBridges%2C+N+T%3BRenno%2C+N%3BMischna%2C+M%3BMoores%2C+J%3BWiens%2C+R%3BAnonymous&rft.aulast=Fisk&rft.aufirst=Martin&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1434.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetry science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 11 N1 - PubXState - TX N1 - SuppNotes - Accessed on Nov. 8, 2013 N1 - Last updated - 2014-07-04 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - astrobiology; brines; carbon; chemical reactions; dunes; electromagnetic radiation; energy sources; ferric iron; ferrous iron; Gale Crater; geochemical cycle; habitat; iron; Mars; Mars Science Laboratory; metals; mixing; moisture; nitrogen; nutrients; organic carbon; oxidation; oxygen; planets; recycling; reduction; Rocknest; terrestrial planets; ultraviolet radiation ER - TY - JOUR T1 - Radiation damage evolution in nanocomposites AN - 1542641444; 2014-045934 AB - As nuclear energy systems are taken to higher levels of radiation damage, there is greater need to develop materials that can withstand that damage. Nanocomposites, nanomaterials comprised of both a high density of internal interfaces and second phases, are one promising avenue for such materials. Most work on nanomaterials has focused on the role of the interfaces as sinks of point defects. Here, motivated by a series of experimental studies on oxide composites, we examine the other component of nanocomposites, the dual phase nature of the material without the interfaces acting as defect sinks. We solve a reaction-diffusion model of defect evolution of simple composites under irradiation which depends on defect properties within each phase with no special behavior accounted for at the interface. We identify three regimes of steady-state defect behavior that depend on the relative thermodynamics and kinetics of the defects in the phases comprising the composite. Importantly, in one regime, defect populations are enhanced on one side of the interface and depleted on the other. Further, transient defect populations can exceed steady-state concentrations. We conclude that the evolution of irradiation-induced defects in one phase of the composite is strongly controlled by the defect properties of the other phase, offering a route to controlling defect evolution in these materials. JF - Mineralogical Magazine AU - Uberuaga, Blas Pedro AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 2371 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - models KW - controls KW - diffusion KW - density KW - radiation damage KW - properties KW - nanocomposites KW - waste disposal KW - thermodynamic properties KW - radioactive waste KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542641444?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Radiation+damage+evolution+in+nanocomposites&rft.au=Uberuaga%2C+Blas+Pedro%3BAnonymous&rft.aulast=Uberuaga&rft.aufirst=Blas&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=2371&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.21 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-07-04 N1 - SubjectsTermNotLitGenreText - controls; density; diffusion; models; nanocomposites; properties; radiation damage; radioactive waste; thermodynamic properties; waste disposal DO - http://dx.doi.org/10.1180/minmag.2013.077.5.21 ER - TY - JOUR T1 - A physics-based approach to discriminate low-yield nuclear events; the Source Physics Experiment (SPE) AN - 1535205967; 2014-041595 AB - Discriminating low-yield nuclear explosions is one of the current challenges in the field of monitoring and verification. Work is currently underway in Nevada to address this challenge by conducting a series of experiments using a physics-based approach. This has been accomplished by using a collaborative, multifaceted, multi-disciplinary approach that includes a range of activities, from characterizing the shallow subsurface to acquiring new explosion data, as part of the Source Physics Experiment (SPE). The goal of the SPE is to understand the transition of seismic energy from the near field to the far field; to understand the development of S-waves in explosives sources; and to understand how anisotropy controls seismic energy transmission and partitioning. To fully explore these issues, the SPE series includes tests in both simple and complex geology cases. The current series is being conducted in a highly fractured granite body. This location was chosen, in part, because it was the location of previous nuclear tests in the same rock body and because generally the geology has been well characterized. In addition to historic data, high-resolution seismic data, cross-hole tomography, core samples, LIDAR, hyperspectral, and fracture mapping data have been acquired to further characterize and detect changes after each of the shot across the test bed. The complex geology series includes 7 planned shots using conventional explosives in the same shot hole surrounded by diagnostics to measure yield, acceleration and seismic waveforms. This allows for the use of a single test bed in the granite instead of multiple test beds to obtain the same results. The shots are planned at various depths to obtain a Green's function, scaled depth-of-burial data, nominal depth-of-burial data and damage-zone data. Three shots have been executed to date and the fourth is planned for Aug 2013 as a 220 lb (100 kg) TNT equiv. shot at a depth of 315 ft (96 m). Over 400 data channels have been recorded on the first series of shots with high fidelity. Ultimately, the results from this project will provide the next advances in the science of monitoring to enable a physics-based predicative capability. This work was done by NSTec, LLC, and LANL under Contract No. DE-AC52-06NA25946 with the U.S. Department of Energy. DOE/NV/25946-1834. JF - Abstracts with Programs - Geological Society of America AU - Snelson, Catherine M AU - Chipman, Veraun D AU - White, Robert AU - Emmitt, Ryan AU - Townsend, Margaret AU - Sussman, Aviva AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 428 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1535205967?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=A+physics-based+approach+to+discriminate+low-yield+nuclear+events%3B+the+Source+Physics+Experiment+%28SPE%29&rft.au=Snelson%2C+Catherine+M%3BChipman%2C+Veraun+D%3BWhite%2C+Robert%3BEmmitt%2C+Ryan%3BTownsend%2C+Margaret%3BSussman%2C+Aviva%3BAnonymous&rft.aulast=Snelson&rft.aufirst=Catherine&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=428&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper229291.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-06-13 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Seismic tomography of the Colorado Rocky Mountains upper mantle from CREST; lithosphere-asthenosphere interactions and mantle support of topography AN - 1535204551; 2014-038529 AB - The CREST experiment (Colorado Rocky Mountains Experiment and Seismic Transects) integrated EarthScope USArray Transportable Array with additional stations to image the crust and mantle properties beneath the Colorado Rocky Mountains. A body-wave inversion of P and S wave arrival times recorded at 160 stations shows large Vp perturbations relative to AK135 of 7% and Vs variations of 8% across short (approaching tens of km) lateral distances. The previously identified broad low velocity upper mantle Aspen Anomaly is resolved into multiple features. The lowest Vp and Vs velocities in the region lie beneath the San Juan Mountains, which is clearly distinguished from low velocity features of the northern Rio Grande Rift and Jemez lineament, Aspen region, and below the Never Summer Mountains. We suggest that the San Juan anomaly, and a similar feature below the Latir volcanic field of northern New Mexico, are related to delamination and remnant heat (and melt) beneath these sites of extraordinarily voluminous middle-Cenozoic volcanism. We interpret a northeast-southwest grain in Vs structure parallel to the Colorado Mineral belt to depths near 150 km to be controlled by uppermost mantle Proterozoic accretionary lithospheric architecture. The Wyoming province and northern Colorado Plateau show high velocity features indicative of thick (150 km) preserved Archean and Proterozoic lithosphere, respectively. Overall, uppermost mantle velocity structure consistent with interfingered chemical Proterozoic lithosphere that has been, and possibly is presently being, replaced and magmatically modified by upwelling asthenosphere sourced as deeply as 410 km. One possible driving mechanism for this is interaction between upwelling hydration-induced partial melt and destabilized downwelling lithosphere. Tomographic imaging of mantle seismic velocity and crustal thickness results from the CREST experiment indicate that the highest elevations of the Colorado Rocky Mountains are substantially supported by the mantle. This, along with rich upper mantle seismic heterogeneity, indicate that mantle buoyancy and dynamics are central to the present day topographic support and recent geomorphic evolution of the region, and that relevant mantle influences could originate as deeply as the top of the transition zone. JF - Abstracts with Programs - Geological Society of America AU - Aster, Richard C AU - MacCarthy, Jonathan AU - Karlstrom, Karl E AU - Dueker, Ken G AU - Schmandt, Brandon AU - Hansen, Steve AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 59 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1535204551?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Seismic+tomography+of+the+Colorado+Rocky+Mountains+upper+mantle+from+CREST%3B+lithosphere-asthenosphere+interactions+and+mantle+support+of+topography&rft.au=Aster%2C+Richard+C%3BMacCarthy%2C+Jonathan%3BKarlstrom%2C+Karl+E%3BDueker%2C+Ken+G%3BSchmandt%2C+Brandon%3BHansen%2C+Steve%3BAnonymous&rft.aulast=Aster&rft.aufirst=Richard&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=59&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper225792.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-06-13 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Mapping of light-toned veins and nodules of the John Klein borehole wall in Gale Crater, Mars AN - 1535204534; 2014-038417 AB - Curiosity's drill collects powdered rock cuttings and delivers them to the CHIMRA device that sieves the sample and delivers portions to the SAM evolved gas and isotopic analysis instrument and CheMin XRD/XRF instrument. Curiosity's first drill hole, named John Klein, was drilled on Sol 182 in the sediments of the Sheepbed member of the Yellowknife Bay formation. The drill spot included surficial light-toned veins determined by ChemCam to consist of sulfate minerals. After drilling, vertical MAHLI images showed that the 6 cm deep borehole was partially filled with drill tailings to a depth of approximately 3 cm. Both the vertical MAHLI images and a later ChemCam RMI image of the far wall of the drill hole showed well-defined, light toned veins. Along with RMI images (Sol 227), a vertical series of LIBS points on the drill hole wall confirmed the sulfate composition of the light-toned veins. This led to angled imaging of the borehole with MAHLI to determine the subsurface distribution of veins and the geological context for the LIBS analyses. The MAHLI images were chosen to cover the borehole walls from four cardinal directions. Images with the best contrast were selected and processed to enhance the visibility of the veins and assemble a complete set of images of the walls. The vein surface area was then mapped and the vein-to-total surface area percentage determined, indicating that the vein surface area in the upper half of the John Klein hole is approximately 5.2%. This is higher than the abundances of sulfate minerals (anhydrite and bassanite) determined by CheMin XRD analysis (Vaniman et al., submitted), but within estimated errors the abundances are similar. Errors in the XRD analysis include sieving to remove a coarse fraction which can bias the results. This result has implications for the abundance of veins in the hidden portion of the hole, as the sample collected by CHIMRA only comes from below a depth of 1.5 cm. Therefore, the abundance of veins in the upper 3 cm of the hole is roughly representative of the abundance of the homogenized vein sample in the lower 4.5 cm of the hole. The imaging and mapping of the drill hole walls provides useful complementary data to the bulk analysis of drill cutting by CheMin and SAM. JF - Abstracts with Programs - Geological Society of America AU - Williams, Joshua M AU - Newsom, Horton E AU - Vaniman, David AU - Le Mouelic, Stephan AU - Edgett, Kenneth S AU - Wiens, Roger C AU - Grotzinger, John P AU - Mangold, Nicolas AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 39 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1535204534?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Mapping+of+light-toned+veins+and+nodules+of+the+John+Klein+borehole+wall+in+Gale+Crater%2C+Mars&rft.au=Williams%2C+Joshua+M%3BNewsom%2C+Horton+E%3BVaniman%2C+David%3BLe+Mouelic%2C+Stephan%3BEdgett%2C+Kenneth+S%3BWiens%2C+Roger+C%3BGrotzinger%2C+John+P%3BMangold%2C+Nicolas%3BAnonymous&rft.aulast=Williams&rft.aufirst=Joshua&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=39&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper232005.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-06-13 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Stratigraphy of Yellowknife Bay, Mars; ChemCam observations of chemical variability between members AN - 1535204517; 2014-038413 AB - MSL Curiosity investigated the Yellowknife Bay formation in Gale crater between sols 55 and 269. Orbiter observations and MSL images show visible differences in the stratigraphy of the area. Four main members classified from low to high elevation are Sheepbed, Gillespie Lake, Point Lake, and Shaler. The most notable physical boundary is between Sheepbed and Gillespie Lake. ChemCam has observed targets in all four members, and these data can be compared to see if a change in chemical makeup accompanies the physical changes among members. Alpha Particle X-ray Spectrometer (APXS) data from Yellowknife Bay can also be compared. The 4.75-m-thick assemblage consists of the Sheepbed mudstone and Gillespie Lake sandstone members whose chemistry resembles the bulk upper crust. The uppermost Shaler member is dominated by a more alkali-rich composition and the Point Lake member has an intermediate composition; it is fine-grained with lighttoned veins and nodules - possible sulfates. Oxide ratio plots (K (sub 2) O/Al (sub 2) O (sub 3) , Al (sub 2) O (sub 3) / TiO (sub 2) , and FeO/MgO) best show trends in the chemistry of the members as they are less affected by the compositional variability of the targets. The Point Lake member has similar K (sub 2) O/Al (sub 2) O (sub 3) and FeO/MgO to the Shaler member as well as similar Al (sub 2) O (sub 3) /TiO (sub 2) to the Gillespie Lake member, all within a 95% confidence interval. FeO/MgO mirror K (sub 2) O/Al (sub 2) O (sub 3) , with Sheepbed and Gillespie Lake having similar but lower ratios than Point Lake and Shaler. ChemCam and APXS data agree for K (sub 2) O/Al (sub 2) O (sub 3) and FeO/MgO, but the ChemCam Al (sub 2) O (sub 3) generally show higher abundances than APXS data. Major oxides show little variation within a 95% confidence interval. The most notable chemical boundary is between Gillespie Lake and Point Lake, seen in the differing SiO (sub 2) , MgO, CaO, Na (sub 2) O, and K (sub 2) O. TiO (sub 2) and FeO(T) also differ at the Sheepbed/Gillespie Lake boundary. An increase in alkaline components from the lower to upper two members is clear. This trend is loosely anticorrelated with Al (sub 2) O (sub 3) . Trace element abundances of Rb, Sr and Li between these members show that Shaler, Point Lake and Gillespie Lake are more diverse than Sheepbed. Sheepbed is particularly low in Li relative to the other members. These differences in chemistry may reflect differences in provenance of each member. JF - Abstracts with Programs - Geological Society of America AU - Gordon, Suzanne R AU - Newsom, Horton E AU - Ollila, Ann M AU - Wiens, Roger C AU - Anderson, Ryan B AU - Clegg, Sam M AU - Maurice, Sylvestre AU - Gasnault, Olivier AU - Mangold, Nicolas AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 38 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1535204517?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Stratigraphy+of+Yellowknife+Bay%2C+Mars%3B+ChemCam+observations+of+chemical+variability+between+members&rft.au=Gordon%2C+Suzanne+R%3BNewsom%2C+Horton+E%3BOllila%2C+Ann+M%3BWiens%2C+Roger+C%3BAnderson%2C+Ryan+B%3BClegg%2C+Sam+M%3BMaurice%2C+Sylvestre%3BGasnault%2C+Olivier%3BMangold%2C+Nicolas%3BAnonymous&rft.aulast=Gordon&rft.aufirst=Suzanne&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=38&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper231283.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-06-13 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Mantle driven uplift of the Rocky Mountain/ Colorado Plateau region, its surface manifestations, and implications for mantle processes AN - 1535204492; 2014-038513 AB - The Rocky Mountain (RM)/Colorado Plateau (CP) region is emerging (literally) as a globally important region to test and resolve debates about the processes by which continental lithosphere is modified by interactions with asthenosphere, and the expected surface responses to mantle dynamics at multiple scales. A first-order observation from mantle tomographic images is a dramatic lateral seismic velocity heterogeneity in this region, with lateral P-velocity gradients near 100 km depths showing approximately 6% Vp variations over <80 km lateral length-scales that require significant thermal (up to 500 degrees C) and partial melt/rheology variations sufficient to drive mantle convective flow. Important negative anomalies in the RM are termed the Front Range, Aspen, San Juan and Jemez anomalies. On the southwestern CP, we focus on the high velocity (in P and S waves) anomaly that we call the Escalante Anomaly and its sharp gradients with low velocity domains that rim the western CP. Accumulating evidence for mantle-driven surface deformation and mantle-to-surface connections at a variety of spatial and temporal scales are as follows. 1) Thermochronometric data indicate regional uplift episodes (Laramide 75-50 Ma; mid Tertiary 35-15 Ma, Neogene <10 Ma) separated by times of slow cooling potentially indicating episodic mantle tectonism. 2) Correlations between high topography, low velocity mantle and thin crust beneath the RM favor delamination models during and following the mid-Miocene ignimbrite flare up. 3) Inward sweep of asthenosphere-derived basalt (last 25 Ma) around the CP indicates melt transfer in zones of high velocity gradients and propagation of these zones at plate tectonic rates. 4) Tilting of basalt-capped and beveled fluvial paleosurfaces indicate Miocene and ongoing epeirogenic warping of the western Great Plains, 5) Differential post-10 Ma incision rates along the continental-scale Colorado River (CR) indicate uplift of the RM relative to the CP and the CP relative to the Basin and Range. 6) Regional correlations showing steeper normalized river channels (and rougher topography) associated with low mantle velocity mantle and/or steep velocity gradients. 8) Hydrologic studies show domains of mantle CO2 and 3He degassing correlate with low velocity domains and process zones. JF - Abstracts with Programs - Geological Society of America AU - Karlstrom, Karl E AU - Schmandt, Brandon AU - Dueker, Ken G AU - Aster, Richard C AU - Aslan, Andres AU - Kirby, Eric AU - Crow, Ryan S AU - Coblentz, David AU - Kelley, Shari A AU - Crossey, Laura J AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 56 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1535204492?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Mantle+driven+uplift+of+the+Rocky+Mountain%2F+Colorado+Plateau+region%2C+its+surface+manifestations%2C+and+implications+for+mantle+processes&rft.au=Karlstrom%2C+Karl+E%3BSchmandt%2C+Brandon%3BDueker%2C+Ken+G%3BAster%2C+Richard+C%3BAslan%2C+Andres%3BKirby%2C+Eric%3BCrow%2C+Ryan+S%3BCoblentz%2C+David%3BKelley%2C+Shari+A%3BCrossey%2C+Laura+J%3BAnonymous&rft.aulast=Karlstrom&rft.aufirst=Karl&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=56&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper232187.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-06-13 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - Mineralogy at Bradbury Landing and Yellowknife Bay, Gale Crater, Mars as measured by the ChemCam LIBS AN - 1535203938; 2014-038412 AB - More than 50,000 laser shots of rocks, soils, and dust have been acquired by the ChemCam laser-induced breakdown spectrometer (LIBS) on the Mars Science Laboratory Curiosity rover over its first 269 sols. As the rover has traversed from Bradbury landing site to Yellowknife Bay, LIBS data have been acquired in sets with 30-150 shots at individual locations, often with 9-25 different locations on the same rock being sampled. In approximately 10% of those data sets, the material lased with the approximately 400 mm diameter ChemCam beam contains three or fewer phases, allowing compositions of individual phases with specific compositions to be directly extracted. This capability makes ChemCam a powerful tool for measuring Mars mineralogy. In this study, compositions of individual laser shots were determined using partial least-squares (PLS-1) multivariate analysis and then converted to moles to identify minerals by stoichiometry or through use of elemental ratios. In rare cases, individual minerals were sampled by the laser and the mineral stoichiometries of feldspar and Ca-pyroxene can be identified. In others, multiple LIBS shots on the same material produce constant molar ratios that pass through the origin for elements that occur in only a single phase or two phases. For example, a rock in which the laser samples only varying amounts of feromagnesian silicate and plagioclase (plag) with constant compositions will produce linear arrays of points on a graph of Fe vs. Fe+Mg that pass through the origin and have constant slopes equal to the Fe/(Fe+Mg) content of the ferromag. Olivine (ol) vs. pyroxene (px) may then be distinguished on the basis of partitioning by other elements such as Ni. Results suggest that Fe>Mg compositions predominate for both ol and px in sols through 269. Martian plagioclases were studied using the ratio of Na/(Na+Ca), and have an average composition for these sols of Na (sub 0.45) Ca (sub 0.55) Al (sub 1.5) Si (sub 2.5) O (sub 8) with individual spots spanning the entire range from Ca to Na end-members. A small K-feldspar component, generally <10 mole%, is present either in plagioclase or as a distinct phase. Finally, it is also possible to discern compositions of mineral pairs from linear trends with non-zero intercepts in the plots described above, enabling compositions of, for example, albite+nepheline, plagioclase+pigeonite, and plag+olivine to be determined. JF - Abstracts with Programs - Geological Society of America AU - Dyar, M Darby AU - Bridges, John AU - Wiens, Roger C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 38 PB - Geological Society of America (GSA), Boulder, CO VL - 45 IS - 7 SN - 0016-7592, 0016-7592 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1535203938?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Mineralogy+at+Bradbury+Landing+and+Yellowknife+Bay%2C+Gale+Crater%2C+Mars+as+measured+by+the+ChemCam+LIBS&rft.au=Dyar%2C+M+Darby%3BBridges%2C+John%3BWiens%2C+Roger+C%3BAnonymous&rft.aulast=Dyar&rft.aufirst=M&rft.date=2013-01-01&rft.volume=45&rft.issue=7&rft.spage=38&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2013AM/webprogram/Paper229474.html LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2013 annual meeting & exposition N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-06-13 N1 - CODEN - GAAPBC ER - TY - JOUR T1 - The petrochemistry of Jake_M; a Martian mugearite AN - 1529797501; 2014-034386 AB - JakeM (JM), the first rock analyzed by the APXS instrument on the Curiosity rover, is an alkaline igneous rock ( approximately 13% normative nepheline). It differs significantly in composition from other known martian rocks and it is fractionated relative to typical martian igneous rocks (MgO approximately 3.5 wt%; Mg# approximately 0.37; Ni < 50 ppm; normative oligoclase and orthoclase [ approximately 13%]). JM is compositionally similar to terrestrial mugearites, a magma type typically found on ocean islands and in continental rift zones; indeed, were JM found on earth, we would be hard pressed to tell from its composition that it is a martian rock. The discovery of this rock type on Mars likely indicates an origin by significant fractional crystallization of a primary alkaline or transitional magma generated by melting a region of the martian mantle compositionally distinct from the sources of other known martian basalts. JM's chemical composition (especially its high Al (sub 2) O (sub 3) and low FeO contents) suggest that this fractional crystallization occurred under conditions that suppressed plagioclase crystallization relative to crystallization at 1 atm. Although non-unique, MELTS calculations indicate that a reasonable match to JM's composition can be achieved at 2 kbar ( approximately 15 km depth on Mars) after approximately 50% fractional crystallization of an estimated parental composition from St. Helena island containing 1.5 wt% H (sub 2) O. This result suggests a possible role for elevated pressure and/or water content in JM's petrogenesis. The discovery of JM has implications for magmatic and eruptive processes on Mars, for the possibility of primary hydrous minerals in martian igneous rocks and for encountering even more fractionated alkaline magmas such as phonolites and trachytes. JM is also distinctly richer in potassium than other martian basalts, consistent with a metasomatized mantle source, perhaps characteristic of the mantle beneath the Gale Crater region. JF - Mineralogical Magazine AU - Stolper, E M AU - Baker, M B AU - Cousin, A AU - Fisk, M AU - Gellert, R AU - King, P L AU - Maurice, S AU - McLennan, S M AU - Minitti, M E AU - Newcombe, M AU - Sautter, V AU - Schmidt, M E AU - Treiman, A H AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 2269 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - silicates KW - alkali basalts KW - volcanic rocks KW - stony meteorites KW - Saint Helena KW - Martian meteorites KW - igneous rocks KW - mantle KW - Mars KW - MELTS algorithm KW - mugearite KW - meteorites KW - melting KW - basalts KW - nepheline group KW - framework silicates KW - water KW - rift zones KW - achondrites KW - alkalic composition KW - terrestrial planets KW - genesis KW - Atlantic Ocean Islands KW - planets KW - nepheline KW - magmas KW - crystallization KW - Jake_M KW - fractional crystallization KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1529797501?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=The+petrochemistry+of+Jake_M%3B+a+Martian+mugearite&rft.au=Stolper%2C+E+M%3BBaker%2C+M+B%3BCousin%2C+A%3BFisk%2C+M%3BGellert%2C+R%3BKing%2C+P+L%3BMaurice%2C+S%3BMcLennan%2C+S+M%3BMinitti%2C+M+E%3BNewcombe%2C+M%3BSautter%2C+V%3BSchmidt%2C+M+E%3BTreiman%2C+A+H%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Stolper&rft.aufirst=E&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=2269&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.19 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-08-14 N1 - SubjectsTermNotLitGenreText - achondrites; alkali basalts; alkalic composition; Atlantic Ocean Islands; basalts; crystallization; fractional crystallization; framework silicates; genesis; igneous rocks; Jake_M; magmas; mantle; Mars; Martian meteorites; melting; MELTS algorithm; meteorites; mugearite; nepheline; nepheline group; planets; rift zones; Saint Helena; silicates; stony meteorites; terrestrial planets; volcanic rocks; water DO - http://dx.doi.org/10.1180/minmag.2013.077.5.19 ER - TY - JOUR T1 - A ten-year record of supraglacial lake evolution and rapid drainage in West Greenland using an automated processing algorithm for multispectral imagery AN - 1529794140; 2014-036638 AB - The rapid drainage of supraglacial lakes introduces large pulses of meltwater to the subglacial environment and creates moulins, surface-to-bed conduits for future melt. Introduction of water to the subglacial system has been shown to affect ice flow, and modeling suggests that variability in water supply and delivery to the subsurface play an important role in the development of the subglacial hydrologic system and its ability to enhance or mitigate ice flow. We developed a fully automated method for tracking meltwater and rapid drainages in large (> 0.125 km (super 2) ) perennial lakes and applied it to a 10 yr time series of ETM+ and MODIS imagery of an outlet glacier flow band in West Greenland. Results indicate interannual variability in maximum coverage and spatial evolution of total lake area. We identify 238 rapid drainage events, occurring most often at low (< 900 m) and middle (900-1200 m) elevations during periods of net filling or peak lake coverage. We observe a general progression of both lake filling and draining from lower to higher elevations but note that the timing of filling onset, peak coverage, and dissipation are also variable. Lake coverage is sensitive to air temperature, and warm years exhibit greater variability in both coverage evolution and rapid drainage. Mid-elevation drainages in 2011 coincide with large surface velocity increases at nearby GPS sites, though the relationships between ice-shed-scale dynamics and meltwater input are still unclear. JF - The Cryosphere (Online) AU - Morriss, B F AU - Hawley, R L AU - Chipman, J W AU - Andrews, L C AU - Catania, G A AU - Hoffman, M J AU - Luethi, M P AU - Neumann, T A Y1 - 2013 PY - 2013 DA - 2013 SP - 1869 EP - 1877 PB - Copernicus on behalf of the European Geosciences Union, Katlenburg-Lindau VL - 7 IS - 6 KW - Global Positioning System KW - lakes KW - Greenland ice sheet KW - data processing KW - West Greenland KW - multispectral analysis KW - Greenland KW - spatial variations KW - mitigation KW - velocity KW - algorithms KW - supraglacial lakes KW - glacial lakes KW - hydrology KW - subglacial environment KW - water supply KW - annual variations KW - Arctic region KW - elevation KW - drainage KW - surface water KW - glacial features KW - models KW - glacial geology KW - remote sensing KW - meltwater KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1529794140?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Cryosphere+%28Online%29&rft.atitle=A+ten-year+record+of+supraglacial+lake+evolution+and+rapid+drainage+in+West+Greenland+using+an+automated+processing+algorithm+for+multispectral+imagery&rft.au=Morriss%2C+B+F%3BHawley%2C+R+L%3BChipman%2C+J+W%3BAndrews%2C+L+C%3BCatania%2C+G+A%3BHoffman%2C+M+J%3BLuethi%2C+M+P%3BNeumann%2C+T+A&rft.aulast=Morriss&rft.aufirst=B&rft.date=2013-01-01&rft.volume=7&rft.issue=6&rft.spage=1869&rft.isbn=&rft.btitle=&rft.title=The+Cryosphere+%28Online%29&rft.issn=1994-0424&rft_id=info:doi/10.5194%2Ftc-7-1869-2013 L2 - http://www.the-cryosphere.net/volumes_and_issues.html LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany N1 - Date revised - 2014-01-01 N1 - Number of references - 27 N1 - Document feature - illus. N1 - Last updated - 2014-05-29 N1 - SubjectsTermNotLitGenreText - algorithms; annual variations; Arctic region; data processing; drainage; elevation; glacial features; glacial geology; glacial lakes; Global Positioning System; Greenland; Greenland ice sheet; hydrology; lakes; meltwater; mitigation; models; multispectral analysis; remote sensing; spatial variations; subglacial environment; supraglacial lakes; surface water; velocity; water supply; West Greenland DO - http://dx.doi.org/10.5194/tc-7-1869-2013 ER - TY - JOUR T1 - Hg isotope fractionation among atmospheric mercury species above a coastal suburban environment (Pensacola, Florida, USA) AN - 1529791849; 2014-034234 AB - Mercury is a pervasive global pollutant that bioaccumulates in aquatic food webs after being methylated in the anoxic zones of aquatic systems. Atmospheric deposition of Hg from local, regional and global is the main contributor to Hg in ecosystems. The fate of Hg in the atmosphere is controlled by multiple processes. We measured the Hg isotopic composition of gaseous elemental Hg (GEM, gold coated quartz sand traps), reactive gaseous Hg (RGM, KCl soaked quartz fiber filters, QFF) and particulate aerosol Hg (Hg (sub (p),) QFF) in the atmosphere above the coast near Pensacola, Florida, during summer 2012. 4 rain samples were also collected. Both mass-dependent (MDF) and mass-independent (MIF) signatures of GEM were significantly different than those of Hg(II) species. GEM, more than 99% of the total Hg at this site, displayed positive delta (super 202) Hg (0.7 to 1.2 ppm,) whereas both RGM and Hg(p) had negative delta (super 202) Hg (-2.4 to -0.1 ppm). On the other hand, GEM (n=14) had slightly negative Delta (super 199) Hg and Delta (super 200) Hg average values -0.26+ or -0.09 ppm and -0.07+ or -0.03 ppm, respectively, whereas Hg(p) (n=17) has slightly positive values (0.33+ or -0.13 ppm and 0.10+ or -0.04 ppm, respectively). RGM displays no significant MIF (Delta (super 199) Hg=0.02+ or -0.14 ppm and Delta (super 200) Hg=-0.02+ or -0.10 ppm). We suggest, in agreement with previous studies, that both oxidation and reduction processes are responsible for the patterns in the isotopic composition of RGM and Hg(p). Preferential scavenging of RGM and Hg(p) (rather than GEM) in wet and dry deposition result in significant variability of the isotopic composition deposited in coastal environments due to seasonal and sporadic changes in air mass trajectories and atmospheric physico-chemistry. JF - Mineralogical Magazine AU - Perrot, Vincent AU - Eller, Virginia AU - Landing, William M AU - Salters, Vincent AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 1951 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - United States KW - methylation KW - isotope fractionation KW - Pensacola Florida KW - ecosystems KW - Florida KW - urban environment KW - reduction KW - mercury KW - processes KW - North America KW - patterns KW - pollutants KW - oxidation KW - pollution KW - atmosphere KW - Escambia County Florida KW - Gulf Coastal Plain KW - Hg-202/Hg-200 KW - deposition KW - metals KW - coastal environment KW - anaerobic environment KW - aquatic environment KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1529791849?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Hg+isotope+fractionation+among+atmospheric+mercury+species+above+a+coastal+suburban+environment+%28Pensacola%2C+Florida%2C+USA%29&rft.au=Perrot%2C+Vincent%3BEller%2C+Virginia%3BLanding%2C+William+M%3BSalters%2C+Vincent%3BAnonymous&rft.aulast=Perrot&rft.aufirst=Vincent&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=1951&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.16 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-05-29 N1 - SubjectsTermNotLitGenreText - anaerobic environment; aquatic environment; atmosphere; coastal environment; deposition; ecosystems; Escambia County Florida; Florida; Gulf Coastal Plain; Hg-202/Hg-200; isotope fractionation; mercury; metals; methylation; North America; oxidation; patterns; Pensacola Florida; pollutants; pollution; processes; reduction; United States; urban environment DO - http://dx.doi.org/10.1180/minmag.2013.077.5.16 ER - TY - JOUR T1 - Global glacier changes; a revised assessment of committed mass losses and sampling uncertainties AN - 1529791088; 2014-036346 AB - Most glaciers and ice caps (GIC) are out of balance with the current climate. To return to equilibrium, GIC must thin and retreat, losing additional mass and raising sea level. Because glacier observations are sparse and geographically biased, there is an undersampling problem common to all global assessments. Here, we further develop an assessment approach based on accumulation-area ratios (AAR) to estimate committed mass losses and analyze the undersampling problem. We compiled all available AAR observations for 144 GIC from 1971 to 2010, and found that most glaciers and ice caps are farther from balance than previously believed. Accounting for regional and global undersampling errors, our model suggests that GIC are committed to additional losses of 32 + or - 12% of their area and 38 + or - 16% of their volume if the future climate resembles the climate of the past decade. These losses imply global mean sea-level rise of 163 + or - 69 mm, assuming total glacier volume of 430 mm sea-level equivalent. To reduce the large uncertainties in these projections, more long-term glacier measurements are needed in poorly sampled regions. JF - The Cryosphere (Online) AU - Mernild, S H AU - Lipscomb, W H AU - Bahr, D B AU - Radic, V AU - Zemp, M Y1 - 2013 PY - 2013 DA - 2013 SP - 1565 EP - 1577 PB - Copernicus on behalf of the European Geosciences Union, Katlenburg-Lindau VL - 7 IS - 5 KW - ablation KW - statistical analysis KW - data processing KW - glaciers KW - mathematical models KW - global change KW - Brewster Glacier KW - equilibrium KW - deglaciation KW - climate change KW - measurement KW - ice caps KW - accumulation-area ratios KW - sea-level changes KW - melting KW - sampling KW - mass balance KW - data bases KW - glacial geology KW - glacial dynamics KW - uncertainty KW - climate KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1529791088?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Cryosphere+%28Online%29&rft.atitle=Global+glacier+changes%3B+a+revised+assessment+of+committed+mass+losses+and+sampling+uncertainties&rft.au=Mernild%2C+S+H%3BLipscomb%2C+W+H%3BBahr%2C+D+B%3BRadic%2C+V%3BZemp%2C+M&rft.aulast=Mernild&rft.aufirst=S&rft.date=2013-01-01&rft.volume=7&rft.issue=5&rft.spage=1565&rft.isbn=&rft.btitle=&rft.title=The+Cryosphere+%28Online%29&rft.issn=1994-0424&rft_id=info:doi/10.5194%2Ftc-7-1565-2013 L2 - http://www.the-cryosphere.net/volumes_and_issues.html LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany N1 - Date revised - 2014-01-01 N1 - Number of references - 31 N1 - Document feature - illus. incl. 1 table, sketch map N1 - SuppNotes - Includes appendices N1 - Last updated - 2014-05-29 N1 - SubjectsTermNotLitGenreText - ablation; accumulation-area ratios; Brewster Glacier; climate; climate change; data bases; data processing; deglaciation; equilibrium; glacial dynamics; glacial geology; glaciers; global change; ice caps; mass balance; mathematical models; measurement; melting; sampling; sea-level changes; statistical analysis; uncertainty DO - http://dx.doi.org/10.5194/tc-7-1565-2013 ER - TY - JOUR T1 - Thermal conductivity of UO sub(2+x) and U sub(4)O sub(9-y) AN - 1524416051; 19562510 AB - Stoichiometries of UO sub(2) specimens ranging from 2.000 to 2.210 were prepared in situ at 1673 K within thermoanalytical equipment. Thermal conductivities were analyzed according to Klemens-Callaway defect model. Analysis of the data sets allows for extraction of the fundamental phonon-phonon and phonon-defect scattering contributions for the materials investigated. Low temperature thermal conductivity data was modeled using sigmoidal averaging to calculate the dual phase field UO sub(2+x)- U sub(4)O sub(9-y). This allowed the thermal conductivity of U sub(4)O sub(9-y) to be calculated as a function of temperature up to 873 K. This fundamental dataset provides a key contribution to ongoing efforts in the modeling and simulation communities in the areas of both light water reactor fuel performance and accident evolution. JF - Journal of Nuclear Materials AU - White, J T AU - Nelson, A T AD - Los Alamos National Laboratory, Los Alamos, NM, United States, jtwhite@lanl.gov Y1 - 2013 PY - 2013 DA - 2013 SP - 342 EP - 350 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 443 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Accidents KW - Nuclear reactors KW - Low temperature KW - Thermal conductivity KW - Fuels KW - Nuclear fuels KW - Radioactive materials KW - Temperature KW - Simulation KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1524416051?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Thermal+conductivity+of+UO+sub%282%2Bx%29+and+U+sub%284%29O+sub%289-y%29&rft.au=White%2C+J+T%3BNelson%2C+A+T&rft.aulast=White&rft.aufirst=J&rft.date=2013-01-01&rft.volume=443&rft.issue=1-3&rft.spage=342&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2013.07.063 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-05-01 N1 - Number of references - 38 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Accidents; Low temperature; Nuclear reactors; Thermal conductivity; Fuels; Radioactive materials; Nuclear fuels; Temperature; Simulation DO - http://dx.doi.org/10.1016/j.jnucmat.2013.07.063 ER - TY - JOUR T1 - Neutron and X-ray diffraction analysis of the effect of irradiation dose and temperature on microstructure of irradiated HT-9 steel AN - 1524415700; 19562533 AB - Material harvested from several positions within a nuclear fuel duct (the ACO-3 duct) used in a 6-year irradiation of a fuel assembly in the Fast Flux Test Reactor Facility (FFTF) was examined using neutron and high-energy X-ray diffraction. Samples with a wide range of irradiation dose and irradiation temperature history, reaching doses of up to 147 dpa and temperatures of up to 777 K, were examined. The response of various microstructural characteristics such as the weight fraction of M sub(23)C sub(6) carbides, the dislocation density and character, and the crystallographic texture were determined using whole profile analysis of the diffraction data and related to the macroscopic mechanical behavior. For instance, the dislocation density was observed to be intimately linked with observed flow strength of the irradiated materials, following the Taylor law. In general, at the high doses studied in this work, the irradiation temperature is the predominant controlling factor of the dislocation density and, thus, the flow strength of the irradiated material. The results, representing some of the first diffraction work done on samples exposed to such a high received dose, demonstrate how non-destructive and stand-off diffraction techniques can be used to characterize irradiation induced microstructure and at least estimate mechanical properties in irradiated materials without exposing workers to radiation hazards. JF - Journal of Nuclear Materials AU - Mosbrucker, P L AU - Brown, D W AU - Anderoglu, O AU - Balogh, L AU - Maloy, S A AU - Sisneros, T A AU - Almer, J AU - Tulk, E F AU - Morgenroth, W AU - Dippel, A C AD - Kinectrics Inc., 800 Kipling Ave. Unit 2, Toronto, ON M8Z 5G5, Canada, dbrown@lanl.gov Y1 - 2013 PY - 2013 DA - 2013 SP - 552 EP - 530 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 443 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Historical account KW - Nuclear reactors KW - Irradiation KW - Fuels KW - Nuclear fuels KW - Radioactive materials KW - Temperature KW - Steel KW - X-ray diffraction KW - Radiation hazards KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1524415700?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Neutron+and+X-ray+diffraction+analysis+of+the+effect+of+irradiation+dose+and+temperature+on+microstructure+of+irradiated+HT-9+steel&rft.au=Mosbrucker%2C+P+L%3BBrown%2C+D+W%3BAnderoglu%2C+O%3BBalogh%2C+L%3BMaloy%2C+S+A%3BSisneros%2C+T+A%3BAlmer%2C+J%3BTulk%2C+E+F%3BMorgenroth%2C+W%3BDippel%2C+A+C&rft.aulast=Mosbrucker&rft.aufirst=P&rft.date=2013-01-01&rft.volume=443&rft.issue=1-3&rft.spage=552&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2013.07.065 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-05-01 N1 - Number of references - 44 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Historical account; Nuclear reactors; Fuels; Irradiation; Radioactive materials; Nuclear fuels; Temperature; Steel; Radiation hazards; X-ray diffraction DO - http://dx.doi.org/10.1016/j.jnucmat.2013.07.065 ER - TY - JOUR T1 - Atmospheric breakup of meteoroids and the strength of Fe-Ni AN - 1502298553; 2014-012300 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Swift, D C AU - Mulford, R N AU - Chen, L AU - Milathianaki, D AU - El-Dasher, B AU - Remington, B A AU - Eakins, D AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 3090 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - fragmentation KW - penetration KW - atmospheric entry KW - strength KW - stress KW - atmosphere KW - meteoroids KW - deformation KW - simulation KW - iron KW - meteorites KW - yield strength KW - micrometeoroids KW - iron meteorites KW - metals KW - nickel KW - hydrodynamics KW - alloys KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1502298553?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Atmospheric+breakup+of+meteoroids+and+the+strength+of+Fe-Ni&rft.au=Swift%2C+D+C%3BMulford%2C+R+N%3BChen%2C+L%3BMilathianaki%2C+D%3BEl-Dasher%2C+B%3BRemington%2C+B+A%3BEakins%2C+D%3BAnonymous&rft.aulast=Swift&rft.aufirst=D&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/3090.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 4 N1 - PubXState - TX N1 - SuppNotes - Accessed on Dec. 5, 2013 N1 - Last updated - 2014-02-27 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alloys; atmosphere; atmospheric entry; deformation; fragmentation; hydrodynamics; iron; iron meteorites; metals; meteorites; meteoroids; micrometeoroids; nickel; penetration; simulation; strength; stress; yield strength ER - TY - JOUR T1 - Proton tomography of meteorites Milton and Abbott AN - 1502298324; 2014-012226 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Olinger, C T AU - Espinoza, C J AU - Kwiatkowski, K K AU - Lopez, J D AU - Fesseha, G M AU - Merrill, F E AU - Morris, C AU - Murray, M M AU - Nedrow, P AU - Saunders, A AU - Trouw, F R AU - Tybo, J L AU - Agee, C B AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1756 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - tomography KW - stony irons KW - methods KW - imagery KW - three-dimensional models KW - protons KW - Milton Meteorite KW - Abbott Meteorite KW - radiography KW - meteorites KW - inclusions KW - chemical composition KW - pallasite KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1502298324?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Proton+tomography+of+meteorites+Milton+and+Abbott&rft.au=Olinger%2C+C+T%3BEspinoza%2C+C+J%3BKwiatkowski%2C+K+K%3BLopez%2C+J+D%3BFesseha%2C+G+M%3BMerrill%2C+F+E%3BMorris%2C+C%3BMurray%2C+M+M%3BNedrow%2C+P%3BSaunders%2C+A%3BTrouw%2C+F+R%3BTybo%2C+J+L%3BAgee%2C+C+B%3BAnonymous&rft.aulast=Olinger&rft.aufirst=C&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1756.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 4 N1 - PubXState - TX N1 - Document feature - illus. N1 - Last updated - 2014-02-27 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Abbott Meteorite; chemical composition; imagery; inclusions; meteorites; methods; Milton Meteorite; pallasite; protons; radiography; stony irons; three-dimensional models; tomography ER - TY - JOUR T1 - Exploring the effects of pre-existing target faults on crater morphology AN - 1502297670; 2014-012290 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Plesko, Catherine S AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2896 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - United States KW - cratering KW - Coconino County Arizona KW - numerical models KW - impact features KW - three-dimensional models KW - joints KW - excavations KW - morphology KW - fractures KW - finite element analysis KW - craters KW - Arizona KW - impact craters KW - Meteor Crater KW - target materials KW - polygons KW - faults KW - fault zones KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1502297670?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Exploring+the+effects+of+pre-existing+target+faults+on+crater+morphology&rft.au=Plesko%2C+Catherine+S%3BAnonymous&rft.aulast=Plesko&rft.aufirst=Catherine&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2896.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 11 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Dec. 5, 2013 N1 - Last updated - 2014-02-27 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Arizona; Coconino County Arizona; cratering; craters; excavations; fault zones; faults; finite element analysis; fractures; impact craters; impact features; joints; Meteor Crater; morphology; numerical models; polygons; target materials; three-dimensional models; United States ER - TY - JOUR T1 - QUIC transport and dispersion modelling of two releases from the Joint Urban 2003 field experiment AN - 1500776524; 19274677 AB - An in-depth comparison of plume calculations from the Quick Urban and Industrial Complex (QUIC) dispersion model to street- and roof-level concentration measurements for a daytime and night time release taken during the Joint Urban 2003 field experiment held in downtown Oklahoma City is presented. A number of improvements to the empirical-diagnostic wind solver to better account for high-rise buildings and dense urban areas will be discussed. Traditional plume statistical performance measures reveal that the code is performing as well as computational fluid dynamics models and meets the criteria proposed by Hanna and Chang (2012) for urban dispersion models. Statistics for the day and night release are fairly similar, and model performance drops slightly after the release is turned off in the flushing phase. Scatterplots indicate that rooftop measurements were generally well predicted, although the percentage of outliers (false negatives, large over predictions) was greater as compared to street-level measurements. Using all tracer data within a kilometre of the release, including rooftop samplers, from 39 to 46% of the model-computed concentrations were within a factor of two of the observations when broken up into four cases stratified by day or night and release on or off. JF - International Journal of Environment and Pollution AU - Brown, Michael J AU - Gowardhan, Akshay A AU - Nelson, Mathew A AU - Williams, Michael D AU - Pardyjak, Eric R AD - Los Alamos National Laboratory, Systems Analysis and Surveillance, Los Alamos, NM 87545, USA Y1 - 2013///0, PY - 2013 DA - 0, 2013 SP - 263 EP - 287 PB - Inderscience Publishers Ltd., PO Box 735 Olney Bucks MK46 5WB United Kingdom VL - 52 IS - 3-4 SN - 0957-4352, 0957-4352 KW - Materials Business File (MB); Environmental Engineering Abstracts (EN); CSA / ASCE Civil Engineering Abstracts (CE); ANTE: Abstracts in New Technologies and Engineering (AN) KW - ENERGY AND ENVIRONMENT KW - Environment and Sustainable Development KW - Dispersions KW - Statistics KW - Mathematical models KW - Night KW - Flushing KW - Criteria KW - Plumes KW - Urban areas KW - Yes:(AN) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1500776524?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Journal+of+Environment+and+Pollution&rft.atitle=QUIC+transport+and+dispersion+modelling+of+two+releases+from+the+Joint+Urban+2003+field+experiment&rft.au=Brown%2C+Michael+J%3BGowardhan%2C+Akshay+A%3BNelson%2C+Mathew+A%3BWilliams%2C+Michael+D%3BPardyjak%2C+Eric+R&rft.aulast=Brown&rft.aufirst=Michael&rft.date=2013-01-01&rft.volume=52&rft.issue=3-4&rft.spage=263&rft.isbn=&rft.btitle=&rft.title=International+Journal+of+Environment+and+Pollution&rft.issn=09574352&rft_id=info:doi/10.1504%2FIJEP.2013.058458 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-04-01 N1 - Last updated - 2016-06-30 DO - http://dx.doi.org/10.1504/IJEP.2013.058458 ER - TY - JOUR T1 - Using phage display selected antibodies to dissect microbiomes for complete de novo genome sequencing of low abundance microbes AN - 1492631528; 18868720 AB - Background: Single cell genomics has revolutionized microbial sequencing, but complete coverage of genomes in complex microbiomes is imperfect due to enormous variation in organismal abundance and amplification bias. Empirical methods that complement rapidly improving bioinformatic tools will improve characterization of microbiomes and facilitate better genome coverage for low abundance microbes. Methods: We describe a new approach to sequencing individual species from microbiomes that combines antibody phage display against intact bacteria with fluorescence activated cell sorting (FACS). Single chain (scFv) antibodies are selected using phage display against a bacteria or microbial community, resulting in species-specific antibodies that can be used in FACS for relative quantification of an organism in a community, as well as enrichment or depletion prior to genome sequencing. Results: We selected antibodies against Lactobacillus acidophilus and demonstrate a FACS-based approach for identification and enrichment of the organism from both laboratory-cultured and commercially derived bacterial mixtures. The ability to selectively enrich for L. acidophilus when it is present at a very low abundance (99.8%) de novo genome coverage whereas the standard single-cell sequencing approach is incomplete (<68%). We show that specific antibodies can be selected against L. acidophilus when the monoculture is used as antigen as well as when a community of 10 closely related species is used demonstrating that in principal antibodies can be generated against individual organisms within microbial communities. Conclusions: The approach presented here demonstrates that phage-selected antibodies against bacteria enable identification, enrichment of rare species, and depletion of abundant organisms making it tractable to virtually any microbe or microbial community. Combining antibody specificity with FACS provides a new approach for characterizing and manipulating microbial communities prior to genome sequencing. JF - BMC Microbiology AU - Close, Devin W AU - Ferrara, Fortunato AU - Dichosa, Armand EK AU - Kumar, Sandeep AU - Daughton, Ashlynn R AU - Daligault, Hajnalka E AU - Reitenga, Krista G AU - Velappan, Nileena AU - Sanchez, Timothy C AU - Iyer, Srinivas AU - Kiss, Csaba AU - Han, Cliff S AU - Bradbury, Andrew RM AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM, USA Y1 - 2013 PY - 2013 DA - 2013 SP - 270 PB - BioMed Central Ltd., Middlesex House London W1T 4LB United Kingdom VL - 13 IS - 1 SN - 1471-2180, 1471-2180 KW - Microbiology Abstracts A: Industrial & Applied Microbiology KW - Abundance KW - Antibodies KW - Lactobacillus acidophilus KW - A 01300:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492631528?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologya&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=BMC+Microbiology&rft.atitle=Using+phage+display+selected+antibodies+to+dissect+microbiomes+for+complete+de+novo+genome+sequencing+of+low+abundance+microbes&rft.au=Close%2C+Devin+W%3BFerrara%2C+Fortunato%3BDichosa%2C+Armand+EK%3BKumar%2C+Sandeep%3BDaughton%2C+Ashlynn+R%3BDaligault%2C+Hajnalka+E%3BReitenga%2C+Krista+G%3BVelappan%2C+Nileena%3BSanchez%2C+Timothy+C%3BIyer%2C+Srinivas%3BKiss%2C+Csaba%3BHan%2C+Cliff+S%3BBradbury%2C+Andrew+RM&rft.aulast=Close&rft.aufirst=Devin&rft.date=2013-01-01&rft.volume=13&rft.issue=1&rft.spage=270&rft.isbn=&rft.btitle=&rft.title=BMC+Microbiology&rft.issn=14712180&rft_id=info:doi/10.1186%2F1471-2180-13-270 L2 - http://www.biomedcentral.com/1471-2180/13/270 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-01 N1 - Number of references - 1 N1 - Last updated - 2014-02-11 N1 - SubjectsTermNotLitGenreText - Antibodies; Lactobacillus acidophilus DO - http://dx.doi.org/10.1186/1471-2180-13-270 ER - TY - JOUR T1 - Postcards from Mars; insights into Martian geochemical processes from the Curiosity Rover AN - 1477833063; 2014-004014 AB - With the successful landing of the Mars Curiosity Rover in August 2012, we now have the most capable geochemical laboratory ever to travel to another planet roving Mars' Gale crater. The geochemical instrument suite includes the Chemistry Camera (ChemCam), which uses a laser to vaporize geologic targets and performs atomic emission spectroscopy on the vapor from distances of up to 7 m. This provides a geochemical surveying capability that enables rapid identification of unique specimens and accumulation of a large set of rock and fines compositions as the rover traverses. The Alpha Particle X-ray Spectrometer (APXS) provides high quality "bulk" elemental analyses for major, minor and a few trace elements through a touch deployment on the surface of a rock or soil, and is an upgraded version of similar instruments previously flown to Mars. The addition of x-ray diffraction through the Chemistry and Mineralogy (CheMin) instrument and volatile, isotope, and organic analyses with the Sample Analysis at Mars (SAM) instrument suite, give Curiosity the capability to assess the geochemical history of the planet more deeply than previously possible. Both CheMin and SAM accept sieved fines from either Curiosity's scoop or drill. To date, sampling has occurred at the Rocknest aeolian drift deposit and a fine-grained mudstone called John Klein. At Rocknest, CheMin found a mix of primary igneous minerals and amorphous materials. SAM found that Rocknest fines contain significant bound volatiles that can be released upon heating, largely associated with the amorphous material. Because APXS and ChemCam data support the fines being representative of those found at other sites on Mars, Curiosity results show that martian fines are a good source of water, CO (sub 2) and other volatiles that could be leveraged by living organisms, including future human explorers. At John Klein, early results are consistent with an ancient aqueous habitable environment. Analyses of isotopes and organics also provide exciting windows into martian habitability and volatile evolution. These early geochemical results will be discussed. JF - Mineralogical Magazine AU - Leshin, L A AU - Grotzinger, J P AU - Blake, D F AU - Gellert, R AU - Mahaffy, P R AU - Wiens, R C AU - Maurice, S AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 1590 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - laser methods KW - X-ray diffraction data KW - fines KW - Mars KW - X-ray diffraction analysis KW - Gale Crater KW - emission spectroscopy KW - emission spectra KW - terrestrial planets KW - planets KW - volatiles KW - geochemical surveys KW - mineral composition KW - sampling KW - Curiosity Rover KW - X-ray analysis KW - surveys KW - spectra KW - depositional environment KW - spectroscopy KW - geochemistry KW - 02C:Geochemistry of rocks, soils, and sediments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1477833063?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Postcards+from+Mars%3B+insights+into+Martian+geochemical+processes+from+the+Curiosity+Rover&rft.au=Leshin%2C+L+A%3BGrotzinger%2C+J+P%3BBlake%2C+D+F%3BGellert%2C+R%3BMahaffy%2C+P+R%3BWiens%2C+R+C%3BMaurice%2C+S%3BAnonymous&rft.aulast=Leshin&rft.aufirst=L&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=1590&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.12 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-05-15 N1 - CODEN - MNLMBB N1 - SubjectsTermNotLitGenreText - Curiosity Rover; depositional environment; emission spectra; emission spectroscopy; fines; Gale Crater; geochemical surveys; geochemistry; laser methods; Mars; mineral composition; planets; sampling; spectra; spectroscopy; surveys; terrestrial planets; volatiles; X-ray analysis; X-ray diffraction analysis; X-ray diffraction data DO - http://dx.doi.org/10.1180/minmag.2013.077.5.12 ER - TY - JOUR T1 - Iodine speciation change by a Mn-oxidizing marine bacteria, Roseobacter sp. Azw-3k, through the production of reactive oxygen species AN - 1477832435; 2014-004027 AB - Iodine-129 is one of the most persistent radionuclides released from nuclear reprocessing facilities. With its longevity (half-life: 16 Myr) and biophilic nature (it accumulates in thyroid glands), iodine-129 is a potential human health threat. Thus, it is important to understand the behaviour of iodine in the natural environments. Roseobacter spp. are widely-distributed and comprise up to 15 approximately 20% of bacterial community in coastal/marine environments, and at least one member of this genus, Roseobacter sp. Azw-3k, facilitates extracellular Mn oxidation by releasing superoxide anions (O (sub 2) (super -) ). We hypothesized that Roseobacter. sp. Azw-3k could mediate iodide oxidation through the production of extracellular superoxide anions and/or biogenic Mn(IV) oxides. Without Mn(II), Azw-3k cultures transformed approximately 90% of provided iodide (10 mM) into organo-iodine and iodate within 6 days, whereas in the presence of Mn(II), iodide oxidation only occurred after an initial period of Mn(IV) formation ( approximately 12 days). Heat-killed cells did not transform iodide. O (sub 2) (super -) production rates peaked at day 3, corresponding to early stationary phase of the cultures and the peak of iodide oxidation, and ceased after day 15. The results suggest that biogeneic O (sub 2) (super -) , but not biogenic Mn oxides, were involved in the iodide oxidation process. However, iodide oxidation also occurred in the presence of the O (sub 2) (super -) scavengers, Cu (super 2+) and superoxide dismutase. Results suggest that Azw-3k-mediated iodide oxidation could be facilitated by two reactive oxygen species, O (sub 2) (super -) and its hydrolysis product, H (sub 2) O (sub 2) . JF - Mineralogical Magazine AU - Li, Hsiu-Ping AU - Creeley, Danielle AU - Daniel, Benjamin AU - Grandbois, Russell AU - Zhang, Saijing AU - Xu, Chen AU - Schwehr, Kathy AU - Kaplan, Daniel AU - Santschi, Peter AU - Yeager, Chris M AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 1597 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - oxygen KW - isotopes KW - biochemistry KW - oxidation KW - halogens KW - hydrolysis KW - manganese KW - bioaccumulation KW - Roseobacter KW - iodine KW - radioactive isotopes KW - I-129 KW - chemical reactions KW - metals KW - bacteria KW - geochemistry KW - public health KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1477832435?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Iodine+speciation+change+by+a+Mn-oxidizing+marine+bacteria%2C+Roseobacter+sp.+Azw-3k%2C+through+the+production+of+reactive+oxygen+species&rft.au=Li%2C+Hsiu-Ping%3BCreeley%2C+Danielle%3BDaniel%2C+Benjamin%3BGrandbois%2C+Russell%3BZhang%2C+Saijing%3BXu%2C+Chen%3BSchwehr%2C+Kathy%3BKaplan%2C+Daniel%3BSantschi%2C+Peter%3BYeager%2C+Chris+M%3BAnonymous&rft.aulast=Li&rft.aufirst=Hsiu-Ping&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=1597&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.12 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-01-16 N1 - CODEN - MNLMBB N1 - SubjectsTermNotLitGenreText - bacteria; bioaccumulation; biochemistry; chemical reactions; geochemistry; halogens; hydrolysis; I-129; iodine; isotopes; manganese; metals; oxidation; oxygen; public health; radioactive isotopes; Roseobacter DO - http://dx.doi.org/10.1180/minmag.2013.077.5.12 ER - TY - JOUR T1 - Geochemistry of wellbore integrity in CO (sub 2) sequestration; Portland cement-steel-brine-CO (sub 2) interactions AN - 1477831033; 2014-002447 JF - Reviews in Mineralogy and Geochemistry AU - Carey, J William Y1 - 2013 PY - 2013 DA - 2013 SP - 505 EP - 539 PB - Mineralogical Society of America and Geochemical Society, Washington, DC VL - 77 SN - 1529-6466, 1529-6466 KW - silicates KW - corrosion KW - alteration KW - experimental studies KW - carbon sequestration KW - cement materials KW - mineral-water interface KW - mechanical properties KW - steel KW - solid solution KW - clay minerals KW - carbon dioxide KW - gas injection KW - boreholes KW - chemical reactions KW - transport KW - brines KW - reactive transport KW - sheet silicates KW - thermodynamic properties KW - saline composition KW - construction materials KW - 30:Engineering geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1477831033?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Reviews+in+Mineralogy+and+Geochemistry&rft.atitle=Geochemistry+of+wellbore+integrity+in+CO+%28sub+2%29+sequestration%3B+Portland+cement-steel-brine-CO+%28sub+2%29+interactions&rft.au=Carey%2C+J+William&rft.aulast=Carey&rft.aufirst=J&rft.date=2013-01-01&rft.volume=77&rft.issue=&rft.spage=505&rft.isbn=9780939950928&rft.btitle=&rft.title=Reviews+in+Mineralogy+and+Geochemistry&rft.issn=15296466&rft_id=info:doi/10.2138%2Frmg.2013.77.15 L2 - http://www.minsocam.org/MSA/RIM/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2014-01-01 N1 - Number of references - 88 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2014-01-16 N1 - SubjectsTermNotLitGenreText - alteration; boreholes; brines; carbon dioxide; carbon sequestration; cement materials; chemical reactions; clay minerals; construction materials; corrosion; experimental studies; gas injection; mechanical properties; mineral-water interface; reactive transport; saline composition; sheet silicates; silicates; solid solution; steel; thermodynamic properties; transport DO - http://dx.doi.org/10.2138/rmg.2013.77.15 ER - TY - JOUR T1 - High energy X-ray diffraction measurement of residual stresses in a monolithic aluminum clad uranium-10 wt% molybdenum fuel plate assembly AN - 1475532967; 18796933 AB - Residual stresses are expected in monolithic, aluminum clad uranium 10 wt% molybdenum (U-10Mo) nuclear fuel plates because of the large mismatch in thermal expansion between the two bonded materials. The full residual stress tensor of the U-10Mo foil in a fuel plate assembly was mapped with 0.1 mm resolution using high-energy (86 keV) X-ray diffraction. The in-plane stresses in the U-10Mo foil are strongly compressive, roughly -250 MPa in the longitudinal direction and -140 MPa in the transverse direction near the center of the fuel foil. The normal component of the stress is weakly compressive near the center of the foil and tensile near the corner. The disparity in the residual stress between the two in-plane directions far from the edges and the tensile normal stress suggest that plastic deformation in the aluminum cladding during fabrication by hot isostatic pressing also contributes to the residual stress field. A tensile in-plane residual stress is presumed to be present in the aluminum cladding to balance the large in-plane compressive stresses in the U-10Mo fuel foil, but cannot be directly measured with the current technique due to large grain size. JF - Journal of Nuclear Materials AU - Brown, D W AU - Okuniewski, M A AU - Aimer, J D AU - Balogh, L AU - Clausen, B AU - Okasinski, J S AU - Rabin, B H AD - Los Alamos National Laboratory, Los Alamos, NM 87545, United States, dbrown@lanl.gov Y1 - 2013 PY - 2013 DA - 2013 SP - 252 EP - 261 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 441 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Uranium base alloys KW - U-10Mo KW - Particle size KW - Thermal expansion KW - Fuels KW - Uranium KW - Energy KW - Aluminum KW - Molybdenum KW - Nuclear fuels KW - Radioactive materials KW - Stress KW - X-ray diffraction KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1475532967?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=High+energy+X-ray+diffraction+measurement+of+residual+stresses+in+a+monolithic+aluminum+clad+uranium-10+wt%25+molybdenum+fuel+plate+assembly&rft.au=Brown%2C+D+W%3BOkuniewski%2C+M+A%3BAimer%2C+J+D%3BBalogh%2C+L%3BClausen%2C+B%3BOkasinski%2C+J+S%3BRabin%2C+B+H&rft.aulast=Brown&rft.aufirst=D&rft.date=2013-01-01&rft.volume=441&rft.issue=1-3&rft.spage=252&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Number of references - 33 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Particle size; Thermal expansion; Energy; Uranium; Fuels; Radioactive materials; Nuclear fuels; Molybdenum; Aluminum; Stress; X-ray diffraction ER - TY - JOUR T1 - Habitability approach for MSL AN - 1469625042; 2013-097674 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Gomez, F AU - Gomez-Elvira, J AU - Rodriguez-Manfredi, J A AU - Wiens, R C AU - Meslin, P Y AU - Schroeder, S AU - Maurice, S AU - Ollila, A AU - McKay, C P AU - Renno, N AU - Conrad, Pamela G AU - Wong, M H AU - Sebastian, E AU - Lepinette, A AU - Harri, A M AU - Genzer, M AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2050 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - astrobiology KW - Mars KW - temperature KW - Gale Crater KW - chemical reactions KW - electromagnetic radiation KW - ChemCam KW - chemosynthesis KW - Eh KW - water KW - oxidation KW - free energy KW - Rocknest KW - ultraviolet radiation KW - terrestrial planets KW - models KW - planets KW - habitat KW - humidity KW - Rover Environmental Monitoring Station KW - bacteria KW - Mars Science Laboratory KW - energy KW - endolithic taxa KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469625042?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Habitability+approach+for+MSL&rft.au=Gomez%2C+F%3BGomez-Elvira%2C+J%3BRodriguez-Manfredi%2C+J+A%3BWiens%2C+R+C%3BMeslin%2C+P+Y%3BSchroeder%2C+S%3BMaurice%2C+S%3BOllila%2C+A%3BMcKay%2C+C+P%3BRenno%2C+N%3BConrad%2C+Pamela+G%3BWong%2C+M+H%3BSebastian%2C+E%3BLepinette%2C+A%3BHarri%2C+A+M%3BGenzer%2C+M%3BAnonymous&rft.aulast=Gomez&rft.aufirst=F&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2050.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 9 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 6, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - astrobiology; bacteria; ChemCam; chemical reactions; chemosynthesis; Eh; electromagnetic radiation; endolithic taxa; energy; free energy; Gale Crater; habitat; humidity; Mars; Mars Science Laboratory; models; oxidation; planets; Rocknest; Rover Environmental Monitoring Station; temperature; terrestrial planets; ultraviolet radiation; water ER - TY - JOUR T1 - High calcium phase observations at Rocknest with ChemCam AN - 1469617469; 2013-100314 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Clegg, S M AU - Mangold, N AU - LeMouelic, S AU - Olilla, A AU - Anderson, R AU - Blaney, D L AU - Clark, B AU - Cousin, A AU - Dyar, M D AU - Ehlmann, B AU - Fabre, C AU - Forni, O AU - Lasue, J AU - Meslin, P Y AU - Schroder, S AU - Sirven, J B AU - Vaniman, D AU - Maurice, S AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2087 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - ChemCam instrument KW - calcium KW - apatite KW - anhydrite KW - alkaline earth metals KW - sulfates KW - calcic composition KW - Mars KW - phosphates KW - Rocknest KW - perchlorate KW - iron KW - emission spectra KW - terrestrial planets KW - planets KW - metals KW - mass balance KW - Curiosity Rover KW - LIBS spectra KW - spectra KW - Chemistry and Camera instrument KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469617469?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=High+calcium+phase+observations+at+Rocknest+with+ChemCam&rft.au=Clegg%2C+S+M%3BMangold%2C+N%3BLeMouelic%2C+S%3BOlilla%2C+A%3BAnderson%2C+R%3BBlaney%2C+D+L%3BClark%2C+B%3BCousin%2C+A%3BDyar%2C+M+D%3BEhlmann%2C+B%3BFabre%2C+C%3BForni%2C+O%3BLasue%2C+J%3BMeslin%2C+P+Y%3BSchroder%2C+S%3BSirven%2C+J+B%3BVaniman%2C+D%3BMaurice%2C+S%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Clegg&rft.aufirst=S&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2087.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 7 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 23, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; anhydrite; apatite; calcic composition; calcium; ChemCam instrument; Chemistry and Camera instrument; Curiosity Rover; emission spectra; iron; LIBS spectra; Mars; mass balance; metals; perchlorate; phosphates; planets; Rocknest; spectra; sulfates; terrestrial planets ER - TY - JOUR T1 - Evidence for rock surface alteration with ChemCam from Curiosity's first 90 sols AN - 1469617090; 2013-100320 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Lanza, N L AU - Anderson, R B AU - Blaney, D AU - Bridges, N AU - Clark, B AU - Clegg, S AU - Delapp, D AU - Ehlmann, B AU - Hardgrove, C AU - Leveille, R AU - Mangold, N AU - Melikechi, N AU - Meslin, P Y AU - Mezzacappa, A AU - Newsom, H AU - Ollila, A AU - Wiens, R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1723 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - calcium KW - alteration KW - magnesium KW - weathering rinds KW - Mars KW - emission spectra KW - depth profiles KW - Curiosity Rover KW - sediments KW - LIBS spectra KW - spectra KW - chemical composition KW - ChemCam instrument KW - encrustations KW - alkaline earth metals KW - principal components analysis KW - clastic sediments KW - statistical analysis KW - terrestrial planets KW - planets KW - metals KW - rock varnish KW - dust KW - Chemistry and Camera instrument KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469617090?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Evidence+for+rock+surface+alteration+with+ChemCam+from+Curiosity%27s+first+90+sols&rft.au=Lanza%2C+N+L%3BAnderson%2C+R+B%3BBlaney%2C+D%3BBridges%2C+N%3BClark%2C+B%3BClegg%2C+S%3BDelapp%2C+D%3BEhlmann%2C+B%3BHardgrove%2C+C%3BLeveille%2C+R%3BMangold%2C+N%3BMelikechi%2C+N%3BMeslin%2C+P+Y%3BMezzacappa%2C+A%3BNewsom%2C+H%3BOllila%2C+A%3BWiens%2C+R%3BAnonymous&rft.aulast=Lanza&rft.aufirst=N&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1723.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 11 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 26, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; alteration; calcium; ChemCam instrument; chemical composition; Chemistry and Camera instrument; clastic sediments; Curiosity Rover; depth profiles; dust; emission spectra; encrustations; LIBS spectra; magnesium; Mars; metals; planets; principal components analysis; rock varnish; sediments; spectra; statistical analysis; terrestrial planets; weathering rinds ER - TY - JOUR T1 - ChemCam analysis on Jake Matijevic, Gale Crater AN - 1469617071; 2013-100321 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Cousin, A AU - Wiens, R C AU - Sautter, V AU - Mangold, N AU - Fabre, C AU - Berger, G AU - Forni, O AU - Maurice, S AU - Glasnault, O AU - Anderson, R AU - Clark, B AU - Lasue, J AU - Le Mouelic, S AU - Lewin, E AU - Ollila, A AU - Clegg, S AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1409 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - silicates KW - Jake Matijevic rock KW - igneous rocks KW - olivine group KW - Mars KW - Gale Crater KW - emission spectra KW - pyroxene group KW - mineral composition KW - olivine KW - Curiosity Rover KW - orthosilicates KW - ultraviolet spectra KW - LIBS spectra KW - framework silicates KW - spectra KW - heterogeneity KW - chemical composition KW - basaltic composition KW - chain silicates KW - ChemCam instrument KW - plagioclase KW - independent component analysis KW - grain size KW - statistical analysis KW - terrestrial planets KW - nesosilicates KW - univariate analysis KW - planets KW - Chemistry and Camera instrument KW - feldspar group KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469617071?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=ChemCam+analysis+on+Jake+Matijevic%2C+Gale+Crater&rft.au=Cousin%2C+A%3BWiens%2C+R+C%3BSautter%2C+V%3BMangold%2C+N%3BFabre%2C+C%3BBerger%2C+G%3BForni%2C+O%3BMaurice%2C+S%3BGlasnault%2C+O%3BAnderson%2C+R%3BClark%2C+B%3BLasue%2C+J%3BLe+Mouelic%2C+S%3BLewin%2C+E%3BOllila%2C+A%3BClegg%2C+S%3BAnonymous&rft.aulast=Cousin&rft.aufirst=A&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1409.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 11 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - basaltic composition; chain silicates; ChemCam instrument; chemical composition; Chemistry and Camera instrument; Curiosity Rover; emission spectra; feldspar group; framework silicates; Gale Crater; grain size; heterogeneity; igneous rocks; independent component analysis; Jake Matijevic rock; LIBS spectra; Mars; mineral composition; nesosilicates; olivine; olivine group; orthosilicates; plagioclase; planets; pyroxene group; silicates; spectra; statistical analysis; terrestrial planets; ultraviolet spectra; univariate analysis ER - TY - JOUR T1 - Chemical variability and trends in ChemCam Mars observations in the first 90 sols using independent component analysis AN - 1469617066; 2013-100328 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Forni, O AU - Gasnault, O AU - Meslin, P Y AU - Sautter, V AU - Mangold, N AU - Cousin, A AU - Anderson, R AU - Clegg, S AU - Fabre, C AU - Lasue, J AU - Maurice, S AU - Melikechi, N AU - Ollila, A AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1262 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - calcium sulfate KW - calcium KW - magnesium KW - laser-induced breakdown spectroscopy KW - Mars KW - silicon KW - iron KW - sedimentary rocks KW - multivariate analysis KW - rocks KW - soils KW - ChemCam instrument KW - alkaline earth metals KW - chemical analysis KW - independent component analysis KW - statistical analysis KW - alkali metals KW - sodium KW - conglomerate KW - emission spectroscopy KW - terrestrial planets KW - planets KW - metals KW - hydrogen KW - potassium KW - Mars Science Laboratory KW - Chemistry and Camera instrument KW - spectroscopy KW - clastic rocks KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469617066?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Chemical+variability+and+trends+in+ChemCam+Mars+observations+in+the+first+90+sols+using+independent+component+analysis&rft.au=Forni%2C+O%3BGasnault%2C+O%3BMeslin%2C+P+Y%3BSautter%2C+V%3BMangold%2C+N%3BCousin%2C+A%3BAnderson%2C+R%3BClegg%2C+S%3BFabre%2C+C%3BLasue%2C+J%3BMaurice%2C+S%3BMelikechi%2C+N%3BOllila%2C+A%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Forni&rft.aufirst=O&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1262.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 12 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali metals; alkaline earth metals; calcium; calcium sulfate; ChemCam instrument; chemical analysis; Chemistry and Camera instrument; clastic rocks; conglomerate; emission spectroscopy; hydrogen; independent component analysis; iron; laser-induced breakdown spectroscopy; magnesium; Mars; Mars Science Laboratory; metals; multivariate analysis; planets; potassium; rocks; sedimentary rocks; silicon; sodium; soils; spectroscopy; statistical analysis; terrestrial planets ER - TY - JOUR T1 - Overview of 100 sols of ChemCam operations at Gale Crater AN - 1469617032; 2013-100326 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Maurice, S AU - Wiens, R C AU - Blaney, D AU - Bridges, J AU - Bridges, N AU - Clark, B AU - Clegg, S AU - Dromart, G AU - D'Uston, C AU - Dyar, D AU - Fabre, C AU - Gasnault, O AU - Herkenhoff, K AU - Langevin, Y AU - Mangold, N AU - Mauchien, P AU - McKay, C AU - Newsom, H AU - Vaniman, D AU - Anderson, R AU - Barraclough, B AU - Bender, S AU - Berger, G AU - Blank, J AU - Cousin, A AU - Deflores, L AU - Delapp, D AU - Donny, C AU - Eh-Imann, B AU - Forni, O AU - Gondet, B AU - Guillemot, P AU - Johnson, J AU - Johnstone, S AU - Lacour, J L AU - Lafaille, V AU - Lanza, N AU - Lasue, J AU - Moores, J AU - Le Mouelic, S AU - Lewin, E AU - Lorigny, E AU - Melikechi, N AU - Meslin, P Y AU - Mezzacappa, A AU - Nelson, T AU - Ollila, A AU - Pinet, P AU - Sautter, V AU - Schroeder, S AU - Sirven, J B AU - Tokar, R AU - Toplis, M AU - Yana, C AU - Leveille, R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1979 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - ChemCam instrument KW - imagery KW - chemical analysis KW - laser-induced breakdown spectroscopy KW - statistical analysis KW - data processing KW - Mars KW - calibration KW - Gale Crater KW - emission spectroscopy KW - terrestrial planets KW - univariate analysis KW - planets KW - major elements KW - multivariate analysis KW - Mars Science Laboratory KW - trace elements KW - Chemistry and Camera instrument KW - spectroscopy KW - regression analysis KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469617032?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Overview+of+100+sols+of+ChemCam+operations+at+Gale+Crater&rft.au=Maurice%2C+S%3BWiens%2C+R+C%3BBlaney%2C+D%3BBridges%2C+J%3BBridges%2C+N%3BClark%2C+B%3BClegg%2C+S%3BDromart%2C+G%3BD%27Uston%2C+C%3BDyar%2C+D%3BFabre%2C+C%3BGasnault%2C+O%3BHerkenhoff%2C+K%3BLangevin%2C+Y%3BMangold%2C+N%3BMauchien%2C+P%3BMcKay%2C+C%3BNewsom%2C+H%3BVaniman%2C+D%3BAnderson%2C+R%3BBarraclough%2C+B%3BBender%2C+S%3BBerger%2C+G%3BBlank%2C+J%3BCousin%2C+A%3BDeflores%2C+L%3BDelapp%2C+D%3BDonny%2C+C%3BEh-Imann%2C+B%3BForni%2C+O%3BGondet%2C+B%3BGuillemot%2C+P%3BJohnson%2C+J%3BJohnstone%2C+S%3BLacour%2C+J+L%3BLafaille%2C+V%3BLanza%2C+N%3BLasue%2C+J%3BMoores%2C+J%3BLe+Mouelic%2C+S%3BLewin%2C+E%3BLorigny%2C+E%3BMelikechi%2C+N%3BMeslin%2C+P+Y%3BMezzacappa%2C+A%3BNelson%2C+T%3BOllila%2C+A%3BPinet%2C+P%3BSautter%2C+V%3BSchroeder%2C+S%3BSirven%2C+J+B%3BTokar%2C+R%3BToplis%2C+M%3BYana%2C+C%3BLeveille%2C+R%3BAnonymous&rft.aulast=Maurice&rft.aufirst=S&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1979.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 21 N1 - PubXState - TX N1 - Document feature - 1 table N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - calibration; ChemCam instrument; chemical analysis; Chemistry and Camera instrument; data processing; emission spectroscopy; Gale Crater; imagery; instruments; laser-induced breakdown spectroscopy; major elements; Mars; Mars Science Laboratory; multivariate analysis; planets; regression analysis; spectroscopy; statistical analysis; terrestrial planets; trace elements; univariate analysis ER - TY - JOUR T1 - Partial least squares sensitivity analysis and improvements for ChemCam LIBS data analysis on Mars AN - 1469617031; 2013-100292 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Lasue, J AU - Forni, O AU - Anderson, R B AU - Berger, G AU - Clegg, S M AU - Cousin, A AU - Dyar, M D AU - Fabre, C AU - Gasnault, O AU - Lewin, E AU - Meslin, P Y AU - Maurice, S AU - Tokar, R L AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2230 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - ChemCam instrument KW - partial least-squares analysis KW - chemical analysis KW - laser-induced breakdown spectroscopy KW - Alpha Particle X-ray Spectrometer KW - statistical analysis KW - standard deviation KW - Mars KW - calibration KW - emission spectroscopy KW - terrestrial planets KW - planets KW - errors KW - alpha-ray spectroscopy KW - sensitivity analysis KW - corrections KW - algorithms KW - Chemistry and Camera instrument KW - spectroscopy KW - accuracy KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469617031?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Partial+least+squares+sensitivity+analysis+and+improvements+for+ChemCam+LIBS+data+analysis+on+Mars&rft.au=Lasue%2C+J%3BForni%2C+O%3BAnderson%2C+R+B%3BBerger%2C+G%3BClegg%2C+S+M%3BCousin%2C+A%3BDyar%2C+M+D%3BFabre%2C+C%3BGasnault%2C+O%3BLewin%2C+E%3BMeslin%2C+P+Y%3BMaurice%2C+S%3BTokar%2C+R+L%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Lasue&rft.aufirst=J&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2230.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 15 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Aug. 8, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - accuracy; algorithms; Alpha Particle X-ray Spectrometer; alpha-ray spectroscopy; calibration; ChemCam instrument; chemical analysis; Chemistry and Camera instrument; corrections; emission spectroscopy; errors; instruments; laser-induced breakdown spectroscopy; Mars; partial least-squares analysis; planets; sensitivity analysis; spectroscopy; standard deviation; statistical analysis; terrestrial planets ER - TY - JOUR T1 - Modal mineralogy of igneous rocks with ChemCam at Gale Crater AN - 1469616856; 2013-100313 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Lewin, Eric AU - Ollila, Ann AU - Toplitz, Mike AU - Meslin, Pierre-Yves AU - Maurice, Sylvestre AU - Ehlmann, Bethany AU - Anderson, Ryan AU - Lasue, Jeremie AU - Sautter, Violaine AU - Forni, Olivier AU - Clegg, Sam AU - Cousin, Agnes AU - Dyar, Darby AU - Wiens, Roger AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 3102 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - ChemCam instrument KW - independent component analysis KW - principal components analysis KW - igneous rocks KW - grain size KW - statistical analysis KW - Mars KW - Gale Crater KW - emission spectra KW - terrestrial planets KW - planets KW - mineral composition KW - LIBS spectra KW - spectra KW - Chemistry and Camera instrument KW - modal analysis KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616856?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Modal+mineralogy+of+igneous+rocks+with+ChemCam+at+Gale+Crater&rft.au=Lewin%2C+Eric%3BOllila%2C+Ann%3BToplitz%2C+Mike%3BMeslin%2C+Pierre-Yves%3BMaurice%2C+Sylvestre%3BEhlmann%2C+Bethany%3BAnderson%2C+Ryan%3BLasue%2C+Jeremie%3BSautter%2C+Violaine%3BForni%2C+Olivier%3BClegg%2C+Sam%3BCousin%2C+Agnes%3BDyar%2C+Darby%3BWiens%2C+Roger%3BAnonymous&rft.aulast=Lewin&rft.aufirst=Eric&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/3102.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 22, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - ChemCam instrument; Chemistry and Camera instrument; emission spectra; Gale Crater; grain size; igneous rocks; independent component analysis; LIBS spectra; Mars; mineral composition; modal analysis; planets; principal components analysis; spectra; statistical analysis; terrestrial planets ER - TY - JOUR T1 - The effect of chemical evolution in (super 137) CsCl on radionuclide leaching AN - 1469616847; 2013-100769 AB - A critical component of nuclear waste disposal strategy is to prevent radionuclides from leaving the waste form and entering the environment. However, radiation damage and leaching studies over the past 30 years have focused on the performance of the candidate waste form at t=0, with far less attention paid to the phase stability, and subsequent durability, during the course of daughter product formation. As a case study in chemical aging, we consider here the system of (super 137) CsCl, capsules of which exist in storage pools at Hanford, Washington State. We combine density-functional-theory (DFT) calculations with pore sale modeling to gain a sense of how radionuclide leaching varies as a function of time due to in-growth of the daughter products. In previous calculations of bulk material we have shown that beta-decay of (super 137) Cs to stable (super 137) Ba generates a rocksalt BaCl daughter phase in which the Ba does not have the expected 2+ oxidation state. This phenomenon is an example of a process we term radioparagenesis, in which decay of a major lattice constituent gives rise to a novel solid state daughter phase. Here we study radioparagenesis at surfaces, finding that isolated Ba atoms are most stable in the sub-surface layer, while pairs of Ba atoms have a large binding energy. The Ba atoms also enhance segregation of Cs and Cl vacancies to the surface, suggesting that although Ba will not easily migrate to the surface of the crystal, it significantly modifies the behavior of other defects. In particular, when water interacts with the CsCl surface, the dissolution energy will depend on whether there is Ba nearby or not. Using Schottky defect formation energies derived from DFT, pore-scale modelling simulations were used to predict dissolution of CsCl into water at 20 degrees C. The models show that the CsCl leaching rate significantly increases when Ba is present, suggesting that chemical aging should be considered as an additional factor in waste form design. JF - Mineralogical Magazine AU - Zhang, F AU - Marks, N A AU - Gale, J D AU - Kang, Q AU - Uberuaga, B P AU - Stanek, C R AU - Henson, N AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 2589 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - United States KW - chlorine KW - alkaline earth metals KW - Washington KW - isotopes KW - pollutants KW - halogens KW - alkali metals KW - pollution KW - Hanford Site KW - radioactive decay KW - radioactive waste KW - radioparagenesis KW - radioactive isotopes KW - Cs-137 KW - cesium KW - barium KW - metals KW - valency KW - waste disposal KW - leaching KW - geochemistry KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616847?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=The+effect+of+chemical+evolution+in+%28super+137%29+CsCl+on+radionuclide+leaching&rft.au=Zhang%2C+F%3BMarks%2C+N+A%3BGale%2C+J+D%3BKang%2C+Q%3BUberuaga%2C+B+P%3BStanek%2C+C+R%3BHenson%2C+N%3BAnonymous&rft.aulast=Zhang&rft.aufirst=F&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=2589&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.26 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2013-01-01 N1 - Number of references - 3 N1 - Last updated - 2013-12-20 N1 - SubjectsTermNotLitGenreText - alkali metals; alkaline earth metals; barium; cesium; chlorine; Cs-137; geochemistry; halogens; Hanford Site; isotopes; leaching; metals; pollutants; pollution; radioactive decay; radioactive isotopes; radioactive waste; radioparagenesis; United States; valency; Washington; waste disposal DO - http://dx.doi.org/10.1180/minmag.2013.077.5.26 ER - TY - JOUR T1 - Missing components in chemical profiles of a sand drift in Gale Crater AN - 1469616831; 2013-100343 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Fisk, M AU - Popa, R AU - Meslin, P Y AU - Lasue, J AU - Mangold, N AU - Leveille, R AU - Goetz, W AU - Bridges, N AU - Renno, N AU - Rubin, N AU - Anderson, R AU - McLennan, S AU - Wiens, R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2156 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - calcium KW - Mars KW - drift KW - manganese KW - layered materials KW - iron KW - Gale Crater KW - major elements KW - sediments KW - oxides KW - chemical composition KW - soils KW - ChemCam instrument KW - sand KW - alkaline earth metals KW - sulfates KW - clastic sediments KW - oxidation KW - MAHLI KW - Rocknest KW - Mars Hand Lens Imager KW - ferrous iron KW - terrestrial planets KW - planets KW - metals KW - Mars Science Laboratory KW - Chemistry and Camera instrument KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616831?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Missing+components+in+chemical+profiles+of+a+sand+drift+in+Gale+Crater&rft.au=Fisk%2C+M%3BPopa%2C+R%3BMeslin%2C+P+Y%3BLasue%2C+J%3BMangold%2C+N%3BLeveille%2C+R%3BGoetz%2C+W%3BBridges%2C+N%3BRenno%2C+N%3BRubin%2C+N%3BAnderson%2C+R%3BMcLennan%2C+S%3BWiens%2C+R%3BAnonymous&rft.aulast=Fisk&rft.aufirst=M&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2156.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 1 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 3, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; calcium; ChemCam instrument; chemical composition; Chemistry and Camera instrument; clastic sediments; drift; ferrous iron; Gale Crater; iron; layered materials; MAHLI; major elements; manganese; Mars; Mars Hand Lens Imager; Mars Science Laboratory; metals; oxidation; oxides; planets; Rocknest; sand; sediments; soils; sulfates; terrestrial planets ER - TY - JOUR T1 - Mars imaging by the ChemCam Remote Microscopic Imager (RMI) onboard Curiosity; the first three months AN - 1469616806; 2013-100323 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Le Mouelic, S AU - Gasnault, O AU - Herkenhoff, K E AU - Langevin, Y AU - Maurice, S AU - Bridges, N T AU - Pinet, P AU - Mangold, N AU - Johnson, J R AU - Wiens, R C AU - Bell, J F, III AU - Cousin, A AU - Dromart, G AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1213 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - soils KW - ChemCam instrument KW - imagery KW - textures KW - Mars KW - terrestrial planets KW - planets KW - topography KW - mosaics KW - Curiosity Rover KW - Chemistry and Camera instrument KW - rocks KW - color imagery KW - Remote Microscopic Imager KW - cameras KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616806?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Mars+imaging+by+the+ChemCam+Remote+Microscopic+Imager+%28RMI%29+onboard+Curiosity%3B+the+first+three+months&rft.au=Le+Mouelic%2C+S%3BGasnault%2C+O%3BHerkenhoff%2C+K+E%3BLangevin%2C+Y%3BMaurice%2C+S%3BBridges%2C+N+T%3BPinet%2C+P%3BMangold%2C+N%3BJohnson%2C+J+R%3BWiens%2C+R+C%3BBell%2C+J+F%2C+III%3BCousin%2C+A%3BDromart%2C+G%3BAnonymous&rft.aulast=Le+Mouelic&rft.aufirst=S&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1213.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 6 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - cameras; ChemCam instrument; Chemistry and Camera instrument; color imagery; Curiosity Rover; imagery; Mars; mosaics; planets; Remote Microscopic Imager; rocks; soils; terrestrial planets; textures; topography ER - TY - JOUR T1 - Rock abrasion textures seen by the ChemCam Remote Micro-Imager on MSL AN - 1469616774; 2013-100324 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Bridges, N T AU - Le Mouelic, S AU - Langevin, Y AU - Herkenhoff, K E AU - Maurice, S AU - Pinet, P AU - Wiens, R C AU - de Pablo, M A AU - Renno, N O AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1214 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - eolian features KW - ChemCam instrument KW - imagery KW - ventifacts KW - erosion KW - textures KW - Remote Micro-Imager KW - wind erosion KW - Mars KW - Gale Crater KW - terrestrial planets KW - planets KW - deflation KW - abrasion KW - Curiosity Rover KW - Mars Science Laboratory KW - Chemistry and Camera instrument KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616774?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Rock+abrasion+textures+seen+by+the+ChemCam+Remote+Micro-Imager+on+MSL&rft.au=Bridges%2C+N+T%3BLe+Mouelic%2C+S%3BLangevin%2C+Y%3BHerkenhoff%2C+K+E%3BMaurice%2C+S%3BPinet%2C+P%3BWiens%2C+R+C%3Bde+Pablo%2C+M+A%3BRenno%2C+N+O%3BAnonymous&rft.aulast=Bridges&rft.aufirst=N&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1214.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 13 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - abrasion; ChemCam instrument; Chemistry and Camera instrument; Curiosity Rover; deflation; eolian features; erosion; Gale Crater; imagery; Mars; Mars Science Laboratory; planets; Remote Micro-Imager; terrestrial planets; textures; ventifacts; wind erosion ER - TY - JOUR T1 - An expanded training set for processing of MSL ChemCam and LIBS data; spectral library samples added and effects on elemental composition results from Mars AN - 1469616708; 2013-100293 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Ehlmann, D L AU - Clegg, S M AU - Anderson, R B AU - Forni, O AU - Lasue, J AU - Lanza, N L AU - Meslin, P Y AU - Ollila, A M AU - Dyar, M D AU - Stolper, E M AU - Rossman, G R AU - Sautter, V AU - Blaney, D AU - Clark, B C AU - Maurice, S AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2600 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - calcium sulfate KW - calcium KW - calcium chloride KW - volcanic rocks KW - laser-induced breakdown spectroscopy KW - igneous rocks KW - halogens KW - Mars KW - silica KW - gypsum KW - standard materials KW - calcium carbonate KW - algorithms KW - chlorine KW - ChemCam instrument KW - alkaline earth metals KW - sodium chloride KW - chemical analysis KW - sulfates KW - statistical analysis KW - alkali metals KW - least-squares analysis KW - emission spectroscopy KW - terrestrial planets KW - aqueous alteration KW - planets KW - metals KW - Mars Science Laboratory KW - Chemistry and Camera instrument KW - spectroscopy KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616708?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=An+expanded+training+set+for+processing+of+MSL+ChemCam+and+LIBS+data%3B+spectral+library+samples+added+and+effects+on+elemental+composition+results+from+Mars&rft.au=Ehlmann%2C+D+L%3BClegg%2C+S+M%3BAnderson%2C+R+B%3BForni%2C+O%3BLasue%2C+J%3BLanza%2C+N+L%3BMeslin%2C+P+Y%3BOllila%2C+A+M%3BDyar%2C+M+D%3BStolper%2C+E+M%3BRossman%2C+G+R%3BSautter%2C+V%3BBlaney%2C+D%3BClark%2C+B+C%3BMaurice%2C+S%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Ehlmann&rft.aufirst=D&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2600.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 16 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Aug. 15, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - algorithms; alkali metals; alkaline earth metals; aqueous alteration; calcium; calcium carbonate; calcium chloride; calcium sulfate; ChemCam instrument; chemical analysis; Chemistry and Camera instrument; chlorine; emission spectroscopy; gypsum; halogens; igneous rocks; laser-induced breakdown spectroscopy; least-squares analysis; Mars; Mars Science Laboratory; metals; planets; silica; sodium chloride; spectroscopy; standard materials; statistical analysis; sulfates; terrestrial planets; volcanic rocks ER - TY - JOUR T1 - ChemCam passive reflectance spectroscopy of Bradbury Landing, Mars AN - 1469616614; 2013-100325 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Johnson, J R AU - Wiens, R AU - Maurice, S AU - Bender, S AU - DeFlores, L AU - Blaney, D AU - Gasnault, O AU - Cloutis, E AU - Bell, J AU - Rice, M AU - Fraeman, A AU - Le Mouelic, S AU - McConnochie, T AU - Ehlmann, B AU - Leveille, R AU - Pinet, P AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1372 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - soils KW - passive methods KW - ChemCam instrument KW - near-infrared spectra KW - optical spectra KW - Bradbury Landing KW - Remote Micro-Imager KW - Mars KW - calibration KW - emission spectra KW - terrestrial planets KW - planets KW - laboratory studies KW - natural analogs KW - Curiosity Rover KW - LIBS spectra KW - spectra KW - Chemistry and Camera instrument KW - reflectance KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616614?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=ChemCam+passive+reflectance+spectroscopy+of+Bradbury+Landing%2C+Mars&rft.au=Johnson%2C+J+R%3BWiens%2C+R%3BMaurice%2C+S%3BBender%2C+S%3BDeFlores%2C+L%3BBlaney%2C+D%3BGasnault%2C+O%3BCloutis%2C+E%3BBell%2C+J%3BRice%2C+M%3BFraeman%2C+A%3BLe+Mouelic%2C+S%3BMcConnochie%2C+T%3BEhlmann%2C+B%3BLeveille%2C+R%3BPinet%2C+P%3BAnonymous&rft.aulast=Johnson&rft.aufirst=J&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1372.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 7 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Bradbury Landing; calibration; ChemCam instrument; Chemistry and Camera instrument; Curiosity Rover; emission spectra; laboratory studies; LIBS spectra; Mars; natural analogs; near-infrared spectra; optical spectra; passive methods; planets; reflectance; Remote Micro-Imager; soils; spectra; terrestrial planets ER - TY - JOUR T1 - Spectral classification and variability in ChemCam data from Bradbury Landing to Rocknest AN - 1469616602; 2013-100329 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Anderson, R B AU - Lasue, J AU - Wiens, R AU - Clegg, S AU - Lanza, N AU - Ehlmann, B AU - Forni, O AU - Gasnault, O AU - Maurice, S AU - Ollila, A AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2750 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - soils KW - ChemCam instrument KW - principal components analysis KW - Bradbury Landing KW - statistical analysis KW - Mars KW - felsic composition KW - Rocknest KW - Gale Crater KW - emission spectra KW - cluster analysis KW - terrestrial planets KW - planets KW - Curiosity Rover KW - classification KW - Mars Science Laboratory KW - LIBS spectra KW - spectra KW - Chemistry and Camera instrument KW - chemical composition KW - rocks KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616602?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Spectral+classification+and+variability+in+ChemCam+data+from+Bradbury+Landing+to+Rocknest&rft.au=Anderson%2C+R+B%3BLasue%2C+J%3BWiens%2C+R%3BClegg%2C+S%3BLanza%2C+N%3BEhlmann%2C+B%3BForni%2C+O%3BGasnault%2C+O%3BMaurice%2C+S%3BOllila%2C+A%3BAnonymous&rft.aulast=Anderson&rft.aufirst=R&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2750.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 9 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - Bradbury Landing; ChemCam instrument; chemical composition; Chemistry and Camera instrument; classification; cluster analysis; Curiosity Rover; emission spectra; felsic composition; Gale Crater; LIBS spectra; Mars; Mars Science Laboratory; planets; principal components analysis; Rocknest; rocks; soils; spectra; statistical analysis; terrestrial planets ER - TY - JOUR T1 - From univariate analyses of the onboard ChemCam calibration targets to estimates of Martian rock and soil compositions AN - 1469616479; 2013-100290 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Fabre, C AU - Cousin, A AU - Sirven, J B AU - Sautter, S AU - Forni, O AU - Meslin, P Y AU - Lasue, J AU - Gasnault, O AU - Berger, G AU - Vaniman, D AU - Maurice, S AU - Wiens, R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1170 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - soils KW - ChemCam instrument KW - chemical analysis KW - laser-induced breakdown spectroscopy KW - statistical analysis KW - Mars KW - calibration KW - emission spectroscopy KW - terrestrial planets KW - univariate analysis KW - planets KW - Curiosity Rover KW - heterogeneity KW - Chemistry and Camera instrument KW - spectroscopy KW - rocks KW - chemical ratios KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469616479?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=From+univariate+analyses+of+the+onboard+ChemCam+calibration+targets+to+estimates+of+Martian+rock+and+soil+compositions&rft.au=Fabre%2C+C%3BCousin%2C+A%3BSirven%2C+J+B%3BSautter%2C+S%3BForni%2C+O%3BMeslin%2C+P+Y%3BLasue%2C+J%3BGasnault%2C+O%3BBerger%2C+G%3BVaniman%2C+D%3BMaurice%2C+S%3BWiens%2C+R%3BAnonymous&rft.aulast=Fabre&rft.aufirst=C&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1170.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 7 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 8, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - calibration; ChemCam instrument; chemical analysis; chemical ratios; Chemistry and Camera instrument; Curiosity Rover; emission spectroscopy; heterogeneity; laser-induced breakdown spectroscopy; Mars; planets; rocks; soils; spectroscopy; statistical analysis; terrestrial planets; univariate analysis ER - TY - JOUR T1 - Processing approaches for optimal science exploitation of the Chemcam Remote Microscopic Imager (RMI) during the first 90 days of Curiosity operations AN - 1469614073; 2013-100294 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Lagevin, Y AU - Gondet, B AU - Le Mouelic, S AU - Gasnault, O AU - Herkenhoff, K E AU - Blaney, D AU - Maurice, S AU - Wiens, R AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1227 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - ChemCam instrument KW - imagery KW - data processing KW - optimization KW - Mars KW - temperature KW - terrestrial planets KW - planets KW - photometry KW - Curiosity Rover KW - signal-to-noise ratio KW - Chemistry and Camera instrument KW - image enhancement KW - Remote Microscopic Imager KW - cameras KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469614073?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Processing+approaches+for+optimal+science+exploitation+of+the+Chemcam+Remote+Microscopic+Imager+%28RMI%29+during+the+first+90+days+of+Curiosity+operations&rft.au=Lagevin%2C+Y%3BGondet%2C+B%3BLe+Mouelic%2C+S%3BGasnault%2C+O%3BHerkenhoff%2C+K+E%3BBlaney%2C+D%3BMaurice%2C+S%3BWiens%2C+R%3BAnonymous&rft.aulast=Lagevin&rft.aufirst=Y&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1227.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 4 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 15, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - cameras; ChemCam instrument; Chemistry and Camera instrument; Curiosity Rover; data processing; image enhancement; imagery; Mars; optimization; photometry; planets; Remote Microscopic Imager; signal-to-noise ratio; temperature; terrestrial planets ER - TY - JOUR T1 - Early results from Gale Crater on ChemCam detections of carbon, lithium, and rubidium AN - 1469614052; 2013-100327 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Ollila, A M AU - Newsom, H E AU - Wiens, R C AU - Lasue, J AU - Clegg, S M AU - Cousin, A AU - Gasnault, O AU - Forni, O AU - Maurice, S AU - Schroeder, S AU - Meslin, P Y AU - Dyar, M D AU - Blank, J G AU - Clark, B AU - Barraclough, B AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2188 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - data processing KW - Mars KW - calibration KW - Gale Crater KW - emission spectra KW - multivariate analysis KW - carbon KW - Curiosity Rover KW - LIBS spectra KW - spectra KW - algorithms KW - chemical composition KW - ChemCam instrument KW - lithium KW - statistical analysis KW - rubidium KW - alkali metals KW - terrestrial planets KW - models KW - univariate analysis KW - planets KW - detection KW - metals KW - Mars Science Laboratory KW - Chemistry and Camera instrument KW - regression analysis KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469614052?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Early+results+from+Gale+Crater+on+ChemCam+detections+of+carbon%2C+lithium%2C+and+rubidium&rft.au=Ollila%2C+A+M%3BNewsom%2C+H+E%3BWiens%2C+R+C%3BLasue%2C+J%3BClegg%2C+S+M%3BCousin%2C+A%3BGasnault%2C+O%3BForni%2C+O%3BMaurice%2C+S%3BSchroeder%2C+S%3BMeslin%2C+P+Y%3BDyar%2C+M+D%3BBlank%2C+J+G%3BClark%2C+B%3BBarraclough%2C+B%3BAnonymous&rft.aulast=Ollila&rft.aufirst=A&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2188.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 8 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - algorithms; alkali metals; calibration; carbon; ChemCam instrument; chemical composition; Chemistry and Camera instrument; Curiosity Rover; data processing; detection; emission spectra; Gale Crater; LIBS spectra; lithium; Mars; Mars Science Laboratory; metals; models; multivariate analysis; planets; regression analysis; rubidium; spectra; statistical analysis; terrestrial planets; univariate analysis ER - TY - JOUR T1 - Assessment of potential rock coatings at Rocknest, Gale Crater with ChemCam AN - 1469613976; 2013-100318 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Blaney, D L AU - Anderson, R AU - Berger, G AU - Bridges, J C AU - Bridges, N T AU - Clark, B AU - Clegg, S AU - Dyar, M D AU - Ehlmann, B AU - Goetz, W AU - King, P L AU - Lanza, N AU - Mangold, N AU - Meslin, P Y AU - Newsom, H AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1568 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - ChemCam instrument KW - calcium KW - encrustations KW - alkaline earth metals KW - Mars KW - Rocknest KW - iron KW - Gale Crater KW - emission spectra KW - depth profiles KW - terrestrial planets KW - planets KW - silica KW - metals KW - LIBS spectra KW - spectra KW - Chemistry and Camera instrument KW - chemical composition KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469613976?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Assessment+of+potential+rock+coatings+at+Rocknest%2C+Gale+Crater+with+ChemCam&rft.au=Blaney%2C+D+L%3BAnderson%2C+R%3BBerger%2C+G%3BBridges%2C+J+C%3BBridges%2C+N+T%3BClark%2C+B%3BClegg%2C+S%3BDyar%2C+M+D%3BEhlmann%2C+B%3BGoetz%2C+W%3BKing%2C+P+L%3BLanza%2C+N%3BMangold%2C+N%3BMeslin%2C+P+Y%3BNewsom%2C+H%3BAnonymous&rft.aulast=Blaney&rft.aufirst=D&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1568.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 7 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Aug. 23, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; calcium; ChemCam instrument; chemical composition; Chemistry and Camera instrument; depth profiles; emission spectra; encrustations; Gale Crater; iron; LIBS spectra; Mars; metals; planets; Rocknest; silica; spectra; terrestrial planets ER - TY - JOUR T1 - Searching for chemical variation across the surface of Rocknest_3 using MSL ChemCam spectra AN - 1469613953; 2013-100317 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Tokar, R L AU - Wiens, R C AU - Maurice, S AU - Lasue, J AU - Johnson, J R AU - Anderson, R B AU - Cousin, A AU - Forni, O AU - Delapp, D M AU - Lanza, N L AU - Clegg, S M AU - Bender, S C AU - Barraclough, B L AU - Dyar, M D AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1283 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - calcium sulfate KW - calcium KW - magnesium KW - volcanic rocks KW - partial least squares analysis KW - igneous rocks KW - Mars KW - silicon KW - emission spectra KW - cluster analysis KW - Curiosity Rover KW - sediments KW - LIBS spectra KW - tuff KW - spectra KW - chemical composition KW - ChemCam instrument KW - alkaline earth metals KW - statistical analysis KW - Rocknest KW - least-squares analysis KW - terrestrial planets KW - pyroclastics KW - planets KW - metals KW - Mars Science Laboratory KW - Chemistry and Camera instrument KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469613953?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Searching+for+chemical+variation+across+the+surface+of+Rocknest_3+using+MSL+ChemCam+spectra&rft.au=Tokar%2C+R+L%3BWiens%2C+R+C%3BMaurice%2C+S%3BLasue%2C+J%3BJohnson%2C+J+R%3BAnderson%2C+R+B%3BCousin%2C+A%3BForni%2C+O%3BDelapp%2C+D+M%3BLanza%2C+N+L%3BClegg%2C+S+M%3BBender%2C+S+C%3BBarraclough%2C+B+L%3BDyar%2C+M+D%3BAnonymous&rft.aulast=Tokar&rft.aufirst=R&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1283.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 6 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Aug. 23, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; calcium; calcium sulfate; ChemCam instrument; chemical composition; Chemistry and Camera instrument; cluster analysis; Curiosity Rover; emission spectra; igneous rocks; least-squares analysis; LIBS spectra; magnesium; Mars; Mars Science Laboratory; metals; partial least squares analysis; planets; pyroclastics; Rocknest; sediments; silicon; spectra; statistical analysis; terrestrial planets; tuff; volcanic rocks ER - TY - JOUR T1 - Multiple isotopic tracers to monitor remediation of uranium solution mining AN - 1469613829; 2013-100542 AB - Roll front uranium deposits form by interaction of U-bearing groundwater with reduction-oxidation gradients in the host sediments. This redox gradient in many roll-front deposits can be visually identified by hematite staining on the oxic side and green-gray sediment color on the anoxic side. A dark boundary between these two zones is concentrated in U(IV) minerals and other reduced metals such as Se and Mo. Solution mining of roll-front deposits perturbs natural redox conditions by oxidizing U (and other metals) in the main ore body for economic recovery. This perturbation coupled with an extensive monitoring well network provides a unique opportunity to assess the natural recovery of reducing conditions after the cessation of mining as a remediation strategy. We have conducted a characterization survey of groundwater, mining fluids and complimentary ore body sediment core from the Smith Ranch mine in eastern Wyoming, USA for (super 87) Sr/ (super 86) Sr, delta (super 34) S sulfate, delta (super 238/235) U and the (super 234/238) U activity ratio. Sampling locations include both active and inactive mining sites. Monitoring wells surrounding the ore body have 4-22 ppb U, 68-413 ppm SO (sub 4) , (super 234) U/ (super 238) U activity ratio 2.9-5.5, delta (super 34) S (super -) 16.6- (super -) 10.8ppm, delta (super 238) / (super 235) U is between 0-2 ppm for most samples. Acid leachates of sediment core from a previously mined unit have low (super 234) U/ (super 238) U activity (0.6-1.6) compared to groundwater outside the ore zone. delta (super 34) S spans nearly 52 ppm (-48-+3.8 ppm) and most samples have delta (super 238/235) U between -2 and 0 ppm. The depletion of (super 238) U in dissolved U(VI) as indicated by negative delta (super 238/235) U suggests U(VI) reduction in the groundwater. There are no observed correlations between (super 234) U/ (super 238) U activity and delta (super 238/235) U. However the U activity ratio does correlate with depth. The low ( (super 234) U/ (super 238) U) in the ore zone will be a sensitive tracer for quantifying the migration of ore zone U to uncontaminated groundwater. JF - Mineralogical Magazine AU - Brown, Shaun T AU - Christensen, John N AU - DePaolo, Donald J AU - Basu, Anirban AU - Reimus, Paul W AU - Simmons, Ardyth M AU - Heikoop, Jeff AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 780 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - United States KW - mining KW - monitoring KW - isotopes KW - pollutants KW - isotope ratios KW - pollution KW - U-228/U-225 KW - stable isotopes KW - remediation KW - ground water KW - Wyoming KW - uranium ores KW - S-34/S-32 KW - metals KW - tracers KW - metal ores KW - sulfur KW - uranium KW - actinides KW - eastern Wyoming KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469613829?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Multiple+isotopic+tracers+to+monitor+remediation+of+uranium+solution+mining&rft.au=Brown%2C+Shaun+T%3BChristensen%2C+John+N%3BDePaolo%2C+Donald+J%3BBasu%2C+Anirban%3BReimus%2C+Paul+W%3BSimmons%2C+Ardyth+M%3BHeikoop%2C+Jeff%3BAnonymous&rft.aulast=Brown&rft.aufirst=Shaun&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=780&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.2 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2013-01-01 N1 - Last updated - 2013-12-20 N1 - SubjectsTermNotLitGenreText - actinides; eastern Wyoming; ground water; isotope ratios; isotopes; metal ores; metals; mining; monitoring; pollutants; pollution; remediation; S-34/S-32; stable isotopes; sulfur; tracers; U-228/U-225; United States; uranium; uranium ores; Wyoming DO - http://dx.doi.org/10.1180/minmag.2013.077.5.2 ER - TY - JOUR T1 - Nucleosynthetic and cosmogenic palladium isotope anomalies resolved in IVB irons AN - 1469613772; 2013-100222 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Wittig, N AU - Humayun, M AU - Leya, I AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 2355 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - palladium KW - isotopes KW - mass spectra KW - cosmogenic elements KW - anomalies KW - nucleosynthesis KW - carbides KW - platinum group KW - ICP mass spectra KW - meteorites KW - IVB iron meteorites KW - tungsten KW - silicon carbide KW - iron meteorites KW - platinum KW - metals KW - osmium KW - cosmic rays KW - alloys KW - spectra KW - condensates KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469613772?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Nucleosynthetic+and+cosmogenic+palladium+isotope+anomalies+resolved+in+IVB+irons&rft.au=Wittig%2C+N%3BHumayun%2C+M%3BLeya%2C+I%3BAnonymous&rft.aulast=Wittig&rft.aufirst=N&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/2355.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 18 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on July 5, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alloys; anomalies; carbides; condensates; cosmic rays; cosmogenic elements; ICP mass spectra; iron meteorites; isotopes; IVB iron meteorites; mass spectra; metals; meteorites; nucleosynthesis; osmium; palladium; platinum; platinum group; silicon carbide; spectra; tungsten ER - TY - JOUR T1 - Is Bathurst Inlet rock an evidence of explosive volcanism in the Rocknest area of Gale Crater? AN - 1469613760; 2013-100315 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Sautter, V AU - Cousin, A AU - Dromard, G AU - Fabre, C AU - Forni, O AU - Gasnault, O AU - Le Mouelic, S AU - Maurice, S AU - Meslin, P Y AU - Minitti, M E AU - Newsom, H E AU - Pinet, P AU - Schieber, J AU - Toplis, M AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1985 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - volcanic rocks KW - Alpha Particle X-ray Spectrometer KW - igneous rocks KW - Mars KW - explosive eruptions KW - Gale Crater KW - volcaniclastics KW - sedimentary rocks KW - mineral composition KW - granular materials KW - whole rock KW - alpha-ray spectroscopy KW - volcanism KW - siltstone KW - Curiosity Rover KW - volcanic ash KW - basaltic composition KW - Bathurst Inlet KW - textures KW - alkali metals KW - potassic composition KW - sodium KW - Rocknest KW - terrestrial planets KW - pyroclastics KW - planets KW - metals KW - potassium KW - spectroscopy KW - clastic rocks KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469613760?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Is+Bathurst+Inlet+rock+an+evidence+of+explosive+volcanism+in+the+Rocknest+area+of+Gale+Crater%3F&rft.au=Sautter%2C+V%3BCousin%2C+A%3BDromard%2C+G%3BFabre%2C+C%3BForni%2C+O%3BGasnault%2C+O%3BLe+Mouelic%2C+S%3BMaurice%2C+S%3BMeslin%2C+P+Y%3BMinitti%2C+M+E%3BNewsom%2C+H+E%3BPinet%2C+P%3BSchieber%2C+J%3BToplis%2C+M%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Sautter&rft.aufirst=V&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1985.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 13 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Aug. 23, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali metals; Alpha Particle X-ray Spectrometer; alpha-ray spectroscopy; basaltic composition; Bathurst Inlet; clastic rocks; Curiosity Rover; explosive eruptions; Gale Crater; granular materials; igneous rocks; Mars; metals; mineral composition; planets; potassic composition; potassium; pyroclastics; Rocknest; sedimentary rocks; siltstone; sodium; spectroscopy; terrestrial planets; textures; volcanic ash; volcanic rocks; volcaniclastics; volcanism; whole rock ER - TY - JOUR T1 - High performance reactive transport simulation of hyperalkaline plume migration in fractured rocks AN - 1469613742; 2013-100651 AB - Integration of hydrogeology and geochemistry is crucial for several problems in Earth Sciences and Engineering. One of the challenges for such integration is the large amount of computational resources needed due to the high non-linearity of the resulting system of equations. Taking advantage of new developments of powerful numerical tools, and based on high performance parallel computing, the solution of regional-scale hydrogeochemical models has become possible. A software solution, denoted iDP, has been developed which serves as an interface between DarcyTools and PFLOTRAN. The project is financed by SKB, the Swedish Nuclear Fuel and Waste Management Company. iDP has been applied for the first time in the Mare Nostrum III, a new facility of the Barcelona Supercomputing Centre. A total of 25,000 processor cores during 5 days were used to solve a large-scale (100 Mcells), long-term (10,000 years) simulation of the hydrogeochemical behaviour of an hyperalkaline plume produced by the dissolution of grout used during the construction of a deep geological repository for spent nuclear fuel. The simulation integrates the complex 3D groundwater flow accounting for the Discrete Fracture Network (DFN) of the site, and the complexity of the geochemical system involved in cement grout dissolution and secondary minerals precipitation within the flowing fractures. JF - Mineralogical Magazine AU - De Vries, L M AU - Molinero, J AU - Ebrahimi, H AU - Svensson, U AU - Lichtner, P AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 SP - 982 PB - Mineralogical Society, London VL - 77 IS - 5 SN - 0026-461X, 0026-461X KW - fractured materials KW - contaminant plumes KW - data processing KW - pollution KW - grouting KW - simulation KW - hydrochemistry KW - radioactive waste KW - ground water KW - models KW - transport KW - precipitation KW - movement KW - reactive transport KW - waste disposal KW - nonlinear processes KW - geochemistry KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469613742?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=High+performance+reactive+transport+simulation+of+hyperalkaline+plume+migration+in+fractured+rocks&rft.au=De+Vries%2C+L+M%3BMolinero%2C+J%3BEbrahimi%2C+H%3BSvensson%2C+U%3BLichtner%2C+P%3BAnonymous&rft.aulast=De+Vries&rft.aufirst=L&rft.date=2013-01-01&rft.volume=77&rft.issue=5&rft.spage=982&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/10.1180%2Fminmag.2013.077.5.4 L2 - http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2013 N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2013-01-01 N1 - Number of references - 2 N1 - Last updated - 2013-12-20 N1 - SubjectsTermNotLitGenreText - contaminant plumes; data processing; fractured materials; geochemistry; ground water; grouting; hydrochemistry; models; movement; nonlinear processes; pollution; precipitation; radioactive waste; reactive transport; simulation; transport; waste disposal DO - http://dx.doi.org/10.1180/minmag.2013.077.5.4 ER - TY - JOUR T1 - Regional and global context of soil and rock chemistry from ChemCam and APXS at Gale Crater AN - 1469613730; 2013-100330 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Newsom, H E AU - Berger, J AU - Ollila, A AU - Gordon, S AU - Wiens, R C AU - Sautter, V AU - Maurice, S AU - Blaney, D AU - Ehlmann, B AU - Dyar, M D AU - Bridges, N AU - Clark, B AU - Clegg, S AU - DeFlores, L AU - Dromart, G AU - D'Ulston, C AU - Fabre, C AU - Gasnault, O AU - Herkenhoff, K AU - Langevin, Y AU - Mangold, N AU - Mauchien, P AU - McKay, C AU - Vaniman, D AU - Anderson, R AU - Baroukh, J AU - Barraclough, B AU - Bender, S AU - Berger, G AU - Blank, J AU - Cousin, A AU - Cros, A AU - Delapp, D AU - Donny, C AU - Forni, O AU - Gondet, B AU - Guillemot, P AU - Johnstone, S AU - Lacour, J L AU - Lafaille, V AU - Lanza, N AU - Lasue, J AU - Le Mouelic, S AU - Lewin, E AU - Lorigny, E AU - Melikechi, N AU - Meslin, P Y AU - Mezzacappa, A AU - Nelson, T AU - Perez, R AU - Pinet, P AU - Saccoccio, M AU - Schroeder, S AU - Sirven, J B AU - Tokar, R AU - Toplis, M AU - Yana, C AU - Gellert, R AU - King, P L AU - Schmidt, M AU - Boynton, W AU - Leveille, R AU - Bridges, J AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1832 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - calcium KW - stony meteorites KW - Alpha Particle X-ray Spectrometer KW - Martian meteorites KW - halogens KW - Mars KW - lithophile elements KW - iron KW - Gale Crater KW - SNC Meteorites KW - Mars Exploration Rover KW - meteorites KW - alpha-ray spectroscopy KW - volatile elements KW - Curiosity Rover KW - gamma-ray spectra KW - spectra KW - rocks KW - Gusev Crater KW - soils KW - chlorine KW - ChemCam instrument KW - alkaline earth metals KW - Bradbury Landing KW - Viking Program KW - achondrites KW - Mars Odyssey KW - terrestrial planets KW - planets KW - metals KW - Mars Science Laboratory KW - Chemistry and Camera instrument KW - spectroscopy KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469613730?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Regional+and+global+context+of+soil+and+rock+chemistry+from+ChemCam+and+APXS+at+Gale+Crater&rft.au=Newsom%2C+H+E%3BBerger%2C+J%3BOllila%2C+A%3BGordon%2C+S%3BWiens%2C+R+C%3BSautter%2C+V%3BMaurice%2C+S%3BBlaney%2C+D%3BEhlmann%2C+B%3BDyar%2C+M+D%3BBridges%2C+N%3BClark%2C+B%3BClegg%2C+S%3BDeFlores%2C+L%3BDromart%2C+G%3BD%27Ulston%2C+C%3BFabre%2C+C%3BGasnault%2C+O%3BHerkenhoff%2C+K%3BLangevin%2C+Y%3BMangold%2C+N%3BMauchien%2C+P%3BMcKay%2C+C%3BVaniman%2C+D%3BAnderson%2C+R%3BBaroukh%2C+J%3BBarraclough%2C+B%3BBender%2C+S%3BBerger%2C+G%3BBlank%2C+J%3BCousin%2C+A%3BCros%2C+A%3BDelapp%2C+D%3BDonny%2C+C%3BForni%2C+O%3BGondet%2C+B%3BGuillemot%2C+P%3BJohnstone%2C+S%3BLacour%2C+J+L%3BLafaille%2C+V%3BLanza%2C+N%3BLasue%2C+J%3BLe+Mouelic%2C+S%3BLewin%2C+E%3BLorigny%2C+E%3BMelikechi%2C+N%3BMeslin%2C+P+Y%3BMezzacappa%2C+A%3BNelson%2C+T%3BPerez%2C+R%3BPinet%2C+P%3BSaccoccio%2C+M%3BSchroeder%2C+S%3BSirven%2C+J+B%3BTokar%2C+R%3BToplis%2C+M%3BYana%2C+C%3BGellert%2C+R%3BKing%2C+P+L%3BSchmidt%2C+M%3BBoynton%2C+W%3BLeveille%2C+R%3BBridges%2C+J%3BAnonymous&rft.aulast=Newsom&rft.aufirst=H&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1832.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 17 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 29, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - achondrites; alkaline earth metals; Alpha Particle X-ray Spectrometer; alpha-ray spectroscopy; Bradbury Landing; calcium; ChemCam instrument; Chemistry and Camera instrument; chlorine; Curiosity Rover; Gale Crater; gamma-ray spectra; Gusev Crater; halogens; iron; lithophile elements; Mars; Mars Exploration Rover; Mars Odyssey; Mars Science Laboratory; Martian meteorites; metals; meteorites; planets; rocks; SNC Meteorites; soils; spectra; spectroscopy; stony meteorites; terrestrial planets; Viking Program; volatile elements ER - TY - JOUR T1 - Possible alteration of rocks observed by ChemCam along the traverse to Glenelg in Gale Crater on Mars AN - 1469613707; 2013-100319 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Berger, G AU - Blaney, D AU - Bridges, J AU - Cousin, A AU - Forni, O AU - Ganault, O AU - Lasue, J AU - Maurice, S AU - Meslin, P Y AU - Pinet, P AU - D'Uston, C AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1502 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - silicates KW - calcium KW - alteration KW - magnesium KW - Glenelg KW - volcanic rocks KW - K-feldspar KW - igneous rocks KW - enrichment KW - mafic composition KW - Mars KW - iron KW - Gale Crater KW - emission spectra KW - whole rock KW - alkali feldspar KW - basalts KW - LIBS spectra KW - framework silicates KW - spectra KW - chemical composition KW - rocks KW - soils KW - ChemCam instrument KW - alkaline earth metals KW - alkali metals KW - nontronite KW - felsic composition KW - clay minerals KW - terrestrial planets KW - aqueous alteration KW - planets KW - metals KW - sheet silicates KW - Chemistry and Camera instrument KW - feldspar group KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469613707?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Possible+alteration+of+rocks+observed+by+ChemCam+along+the+traverse+to+Glenelg+in+Gale+Crater+on+Mars&rft.au=Berger%2C+G%3BBlaney%2C+D%3BBridges%2C+J%3BCousin%2C+A%3BForni%2C+O%3BGanault%2C+O%3BLasue%2C+J%3BMaurice%2C+S%3BMeslin%2C+P+Y%3BPinet%2C+P%3BD%27Uston%2C+C%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Berger&rft.aufirst=G&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1502.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 13 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 26, 2013 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali feldspar; alkali metals; alkaline earth metals; alteration; aqueous alteration; basalts; calcium; ChemCam instrument; chemical composition; Chemistry and Camera instrument; clay minerals; emission spectra; enrichment; feldspar group; felsic composition; framework silicates; Gale Crater; Glenelg; igneous rocks; iron; K-feldspar; LIBS spectra; mafic composition; magnesium; Mars; metals; nontronite; planets; rocks; sheet silicates; silicates; soils; spectra; terrestrial planets; volcanic rocks; whole rock ER - TY - JOUR T1 - c-KIT signaling is targeted by pathogenic Yersinia to suppress the host immune response AN - 1468382378; 18827578 AB - Background: The pathogenic Yersinia species exhibit a primarily extracellular lifestyle through manipulation of host signaling pathways that regulate pro-inflammatory gene expression and cytokine release. To identify host genes that are targeted by Yersinia during the infection process, we performed an RNA interference (RNAi) screen based on recovery of host NF-[kappa]B-mediated gene activation in response to TNF-[alpha] stimulation upon Y. enterocolitica infection. Results: We screened shRNAs against 782 genes in the human kinome and 26 heat shock genes, and identified 19 genes that exhibited > or =40% relative increase in NF-[kappa]B reporter gene activity. The identified genes function in multiple cellular processes including MAP and ERK signaling pathways, ion channel activity, and regulation of cell growth. Pre-treatment with small molecule inhibitors specific for the screen hits c-KIT and CKII recovered NF-[kappa]B gene activation and/or pro-inflammatory TNF-[alpha] cytokine release in multiple cell types, in response to either Y. enterocolitica or Y. pestis infection. Conclusions: We demonstrate that pathogenic Yersinia exploits c-KIT signaling in a T3SS-dependent manner to downregulate expression of transcription factors EGR1 and RelA/p65, and pro-inflammatory cytokines. This study is the first major functional genomics RNAi screen to elucidate virulence mechanisms of a pathogen that is primarily dependent on extracellular-directed immunomodulation of host signaling pathways for suppression of host immunity. JF - BMC Microbiology AU - Micheva-Viteva, Sofiya N AU - Shou, Yulin AU - Nowak-Lovato, Kristy L AU - Rector, Kirk D AU - Hong-Geller, Elizabeth AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87544, USA Y1 - 2013 PY - 2013 DA - 2013 SP - 249 PB - BioMed Central Ltd., Middlesex House London W1T 4LB United Kingdom VL - 13 IS - 1 SN - 1471-2180, 1471-2180 KW - Microbiology Abstracts A: Industrial & Applied Microbiology; Immunology Abstracts; Microbiology Abstracts B: Bacteriology KW - Infection KW - RelA protein KW - Immunomodulation KW - NF- Kappa B protein KW - Virulence KW - Gene expression KW - Extracellular signal-regulated kinase KW - Ion channels KW - Cytokines KW - Heat shock KW - genomics KW - c-Kit protein KW - Immunity KW - Pathogens KW - Yersinia KW - Inflammation KW - Reporter gene KW - Transcription factors KW - Yersinia enterocolitica KW - RNA-mediated interference KW - Immune response KW - EGR-1 protein KW - Transcription activation KW - Signal transduction KW - J 02350:Immunology KW - F 06910:Microorganisms & Parasites KW - A 01300:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1468382378?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=BMC+Microbiology&rft.atitle=c-KIT+signaling+is+targeted+by+pathogenic+Yersinia+to+suppress+the+host+immune+response&rft.au=Micheva-Viteva%2C+Sofiya+N%3BShou%2C+Yulin%3BNowak-Lovato%2C+Kristy+L%3BRector%2C+Kirk+D%3BHong-Geller%2C+Elizabeth&rft.aulast=Micheva-Viteva&rft.aufirst=Sofiya&rft.date=2013-01-01&rft.volume=13&rft.issue=1&rft.spage=249&rft.isbn=&rft.btitle=&rft.title=BMC+Microbiology&rft.issn=14712180&rft_id=info:doi/10.1186%2F1471-2180-13-249 L2 - http://www.biomedcentral.com/1471-2180/13/249 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-12-01 N1 - Number of references - 63 N1 - Last updated - 2014-05-15 N1 - SubjectsTermNotLitGenreText - c-Kit protein; Pathogens; Immunity; Infection; Immunomodulation; RelA protein; Inflammation; NF- Kappa B protein; Gene expression; Virulence; Extracellular signal-regulated kinase; Reporter gene; Transcription factors; Ion channels; Heat shock; RNA-mediated interference; Cytokines; genomics; Immune response; EGR-1 protein; Transcription activation; Signal transduction; Yersinia enterocolitica; Yersinia DO - http://dx.doi.org/10.1186/1471-2180-13-249 ER - TY - JOUR T1 - An integrated approach to realizing high-performance liquid-junction quantum dot sensitized solar cells. AN - 1467068394; 24322379 AB - Solution-processed semiconductor quantum dot solar cells offer a path towards both reduced fabrication cost and higher efficiency enabled by novel processes such as hot-electron extraction and carrier multiplication. Here we use a new class of low-cost, low-toxicity CuInSexS2-x quantum dots to demonstrate sensitized solar cells with certified efficiencies exceeding 5%. Among other material and device design improvements studied, use of a methanol-based polysulfide electrolyte results in a particularly dramatic enhancement in photocurrent and reduced series resistance. Despite the high vapour pressure of methanol, the solar cells are stable for months under ambient conditions, which is much longer than any previously reported quantum dot sensitized solar cell. This study demonstrates the large potential of CuInSexS2-x quantum dots as active materials for the realization of low-cost, robust and efficient photovoltaics as well as a platform for investigating various advanced concepts derived from the unique physics of the nanoscale size regime. JF - Nature communications AU - McDaniel, Hunter AU - Fuke, Nobuhiro AU - Makarov, Nikolay S AU - Pietryga, Jeffrey M AU - Klimov, Victor I AD - Center for Advanced Solar Photophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. Y1 - 2013 PY - 2013 DA - 2013 SP - 2887 VL - 4 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1467068394?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+communications&rft.atitle=An+integrated+approach+to+realizing+high-performance+liquid-junction+quantum+dot+sensitized+solar+cells.&rft.au=McDaniel%2C+Hunter%3BFuke%2C+Nobuhiro%3BMakarov%2C+Nikolay+S%3BPietryga%2C+Jeffrey+M%3BKlimov%2C+Victor+I&rft.aulast=McDaniel&rft.aufirst=Hunter&rft.date=2013-01-01&rft.volume=4&rft.issue=&rft.spage=2887&rft.isbn=&rft.btitle=&rft.title=Nature+communications&rft.issn=2041-1723&rft_id=info:doi/10.1038%2Fncomms3887 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2014-10-07 N1 - Date created - 2013-12-10 N1 - Date revised - 2017-02-17 N1 - SuppNotes - Cited By: ACS Nano. 2009 Jun 23;3(6):1467-76 [19435373] Nat Nanotechnol. 2012 Sep;7(9):577-82 [22842552] ACS Nano. 2010 Oct 26;4(10):6087-97 [20939512] Adv Mater. 2010 Sep 1;22(33):3704-7 [20533423] Nano Lett. 2012 Sep 12;12(9):4889-94 [22881834] N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1038/ncomms3887 ER - TY - JOUR T1 - Integrated results from analysis of the Rocknest aeolian deposit by the Curiosity Rover AN - 1464886068; 2013-095089 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Leshin, L A AU - Grotzinger, J P AU - Blake, D F AU - Edgett, K S AU - Gellert, R AU - Mahaffy, P R AU - Malin, M C AU - Wiens, R C AU - Treiman, A H AU - Ming, D W AU - Eigenbrode, Jennifer L AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract 1174 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - eolian features KW - isotopes KW - igneous rocks KW - halogens KW - Mars KW - stable isotopes KW - carbon dioxide KW - mineral composition KW - Curiosity Rover KW - chemical composition KW - water KW - chlorine KW - isotope ratios KW - atmosphere KW - weathering KW - Rocknest KW - terrestrial planets KW - planets KW - volatiles KW - organic compounds KW - D/H KW - hydrogen KW - fine-grained materials KW - Mars Science Laboratory KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464886068?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Integrated+results+from+analysis+of+the+Rocknest+aeolian+deposit+by+the+Curiosity+Rover&rft.au=Leshin%2C+L+A%3BGrotzinger%2C+J+P%3BBlake%2C+D+F%3BEdgett%2C+K+S%3BGellert%2C+R%3BMahaffy%2C+P+R%3BMalin%2C+M+C%3BWiens%2C+R+C%3BTreiman%2C+A+H%3BMing%2C+D+W%3BEigenbrode%2C+Jennifer+L%3BAnonymous&rft.aulast=Leshin&rft.aufirst=L&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1774.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 3 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 30, 2013 N1 - Last updated - 2013-12-05 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - atmosphere; carbon dioxide; chemical composition; chlorine; Curiosity Rover; D/H; eolian features; fine-grained materials; halogens; hydrogen; igneous rocks; isotope ratios; isotopes; Mars; Mars Science Laboratory; mineral composition; organic compounds; planets; Rocknest; stable isotopes; terrestrial planets; volatiles; water; weathering ER - TY - JOUR T1 - Selecting Summary Statistics in Approximate Bayesian Computation for Calibrating Stochastic Models AN - 1464508036; 18812208 AB - Approximate Bayesian computation (ABC) is an approach for using measurement data to calibrate stochastic computer models, which are common in biology applications. ABC is becoming the "go-to" option when the data and/or parameter dimension is large because it relies on user-chosen summary statistics rather than the full data and is therefore computationally feasible. One technical challenge with ABC is that the quality of the approximation to the posterior distribution of model parameters depends on the user-chosen summary statistics. In this paper, the user requirement to choose effective summary statistics in order to accurately estimate the posterior distribution of model parameters is investigated and illustrated by example, using a model and corresponding real data of mitochondrial DNA population dynamics. We show that for some choices of summary statistics, the posterior distribution of model parameters is closely approximated and for other choices of summary statistics, the posterior distribution is not closely approximated. A strategy to choose effective summary statistics is suggested in cases where the stochastic computer model can be run at many trial parameter settings, as in the example. JF - BioMed Research International AU - Burr, Tom AU - Skurikhin, Alexei AD - Statistical Sciences, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, tburr@lanl.gov Y1 - 2013/01// PY - 2013 DA - Jan 2013 PB - Hindawi Publishing Corporation, P.O. Box 3079 Cuyahoga Falls OH 44223 United States VL - 2013 SN - 2314-6133, 2314-6133 KW - Biotechnology and Bioengineering Abstracts KW - Mitochondrial DNA KW - Statistics KW - Mathematical models KW - Data processing KW - Bayesian analysis KW - Statistical analysis KW - Population dynamics KW - Stochasticity KW - Models KW - W 30960:Bioinformatics & Computer Applications UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464508036?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=BioMed+Research+International&rft.atitle=Selecting+Summary+Statistics+in+Approximate+Bayesian+Computation+for+Calibrating+Stochastic+Models&rft.au=Burr%2C+Tom%3BSkurikhin%2C+Alexei&rft.aulast=Burr&rft.aufirst=Tom&rft.date=2013-01-01&rft.volume=2013&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=BioMed+Research+International&rft.issn=23146133&rft_id=info:doi/10.1155%2F2013%2F210646 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-11-01 N1 - Number of references - 1 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Mitochondrial DNA; Data processing; Mathematical models; Statistics; Bayesian analysis; Statistical analysis; Population dynamics; Stochasticity; Models DO - http://dx.doi.org/10.1155/2013/210646 ER - TY - JOUR T1 - Enhanced lithium ion battery cycling of silicon nanowire anodes by template growth to eliminate silicon underlayer islands. AN - 1458504849; 24144166 AB - It is well-known that one-dimensional nanostructures reduce pulverization of silicon (Si)-based anode materials during Li ion cycling because they allow lateral relaxation. However, even with improved designs, Si nanowire-based structures still exhibit limited cycling stability for extended numbers of cycles, with the specific capacity retention with cycling not showing significant improvements over commercial carbon-based anode materials. We have found that one important reason for the lack of long cycling stability can be the presence of milli- and microscale Si islands which typically form under nanowire arrays during their growth. Stress buildup in these Si island underlayers with cycling results in cracking, and the loss of specific capacity for Si nanowire anodes, due to progressive loss of contact with current collectors. We show that the formation of these parasitic Si islands for Si nanowires grown directly on metal current collectors can be avoided by growth through anodized aluminum oxide templates containing a high density of sub-100 nm nanopores. Using this template approach we demonstrate significantly enhanced cycling stability for Si nanowire-based lithium-ion battery anodes, with retentions of more than ~1000 mA·h/g discharge capacity over 1100 cycles. JF - Nano letters AU - Cho, Jeong-Hyun AU - Picraux, S Tom AD - The Center for Integrated Nanotechnologies, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States. Y1 - 2013 PY - 2013 DA - 2013 SP - 5740 EP - 5747 VL - 13 IS - 11 KW - Ions KW - 0 KW - Lithium KW - 9FN79X2M3F KW - Silicon KW - Z4152N8IUI KW - Index Medicus KW - Nanostructures -- chemistry KW - Ions -- chemistry KW - Electric Power Supplies KW - Electrodes KW - Nanotechnology -- methods KW - Surface Properties KW - Silicon -- chemistry KW - Nanowires -- chemistry KW - Lithium -- chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1458504849?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nano+letters&rft.atitle=Enhanced+lithium+ion+battery+cycling+of+silicon+nanowire+anodes+by+template+growth+to+eliminate+silicon+underlayer+islands.&rft.au=Cho%2C+Jeong-Hyun%3BPicraux%2C+S+Tom&rft.aulast=Cho&rft.aufirst=Jeong-Hyun&rft.date=2013-01-01&rft.volume=13&rft.issue=11&rft.spage=5740&rft.isbn=&rft.btitle=&rft.title=Nano+letters&rft.issn=1530-6992&rft_id=info:doi/10.1021%2Fnl4036498 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2014-06-23 N1 - Date created - 2013-11-13 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/nl4036498 ER - TY - JOUR T1 - A multiple-alignment based primer design algorithm for genetically highly variable DNA targets AN - 1434031036; 18510905 AB - Background: Primer design for highly variable DNA sequences is difficult, and experimental success requires attention to many interacting constraints. The advent of next-generation sequencing methods allows the investigation of rare variants otherwise hidden deep in large populations, but requires attention to population diversity and primer localization in relatively conserved regions, in addition to recognized constraints typically considered in primer design. Results: Design constraints include degenerate sites to maximize population coverage, matching of melting temperatures, optimizing de novo sequence length, finding optimal bio-barcodes to allow efficient downstream analyses, and minimizing risk of dimerization. To facilitate primer design addressing these and other constraints, we created a novel computer program (PrimerDesign) that automates this complex procedure. We show its powers and limitations and give examples of successful designs for the analysis of HIV-1 populations. Conclusions: PrimerDesign is useful for researchers who want to design DNA primers and probes for analyzing highly variable DNA populations. It can be used to design primers for PCR, RT-PCR, Sanger sequencing, next-generation sequencing, and other experimental protocols targeting highly variable DNA samples. JF - BMC Bioinformatics AU - Brodin, Johanna AU - Krishnamoorthy, Mohan AU - Athreya, Gayathri AU - Fischer, Will AU - Hraber, Peter AU - Gleasner, Cheryl AU - Green, Lance AU - Korber, Bette AU - Leitner, Thomas AD - Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Y1 - 2013 PY - 2013 DA - 2013 SP - 255 PB - BioMed Central Ltd., Middlesex House London W1T 4LB United Kingdom VL - 14 IS - 1 SN - 1471-2105, 1471-2105 KW - Biochemistry Abstracts 2: Nucleic Acids; Biotechnology and Bioengineering Abstracts KW - Primer design KW - DNA sequencing KW - Amplicon sequencing KW - Next-generation sequencing KW - PCR KW - Primer dimer KW - Bio-barcodes KW - Multiplex KW - Temperature effects KW - Nucleotide sequence KW - DNA probes KW - Algorithms KW - Probes KW - Melting KW - Computer programs KW - Human immunodeficiency virus 1 KW - Polymerase chain reaction KW - Primers KW - Bioinformatics KW - N 14810:Methods KW - W 30960:Bioinformatics & Computer Applications UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1434031036?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=BMC+Bioinformatics&rft.atitle=A+multiple-alignment+based+primer+design+algorithm+for+genetically+highly+variable+DNA+targets&rft.au=Brodin%2C+Johanna%3BKrishnamoorthy%2C+Mohan%3BAthreya%2C+Gayathri%3BFischer%2C+Will%3BHraber%2C+Peter%3BGleasner%2C+Cheryl%3BGreen%2C+Lance%3BKorber%2C+Bette%3BLeitner%2C+Thomas&rft.aulast=Brodin&rft.aufirst=Johanna&rft.date=2013-01-01&rft.volume=14&rft.issue=1&rft.spage=255&rft.isbn=&rft.btitle=&rft.title=BMC+Bioinformatics&rft.issn=14712105&rft_id=info:doi/10.1186%2F1471-2105-14-255 L2 - http://www.biomedcentral.com/1471-2105/14/255 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-09-01 N1 - Number of references - 32 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Temperature effects; Melting; Computer programs; DNA sequencing; DNA probes; Nucleotide sequence; Probes; Algorithms; Polymerase chain reaction; Primers; Bioinformatics; Human immunodeficiency virus 1 DO - http://dx.doi.org/10.1186/1471-2105-14-255 ER - TY - JOUR T1 - Composition of North West Africa 7533; implications for the origin of Martian soils and crust AN - 1400619952; 2013-057281 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Humayun, Munir AU - Zanda, Brigitte AU - Hewins, R H AU - Goepel, C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract No. 1429 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - soils KW - Northwest Africa Meteorites KW - breccia KW - impactites KW - matrix KW - mass spectra KW - Mars KW - impact breccia KW - clasts KW - NWA 7533 KW - terrestrial planets KW - ICP mass spectra KW - planets KW - meteorites KW - major elements KW - metals KW - metamorphic rocks KW - thickness KW - spectra KW - rare earths KW - chemical composition KW - crust KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400619952?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Composition+of+North+West+Africa+7533%3B+implications+for+the+origin+of+Martian+soils+and+crust&rft.au=Humayun%2C+Munir%3BZanda%2C+Brigitte%3BHewins%2C+R+H%3BGoepel%2C+C%3BAnonymous&rft.aulast=Humayun&rft.aufirst=Munir&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1429.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 13 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on June 7, 2013 N1 - Last updated - 2013-07-18 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - breccia; chemical composition; clasts; crust; ICP mass spectra; impact breccia; impactites; major elements; Mars; mass spectra; matrix; metals; metamorphic rocks; meteorites; Northwest Africa Meteorites; NWA 7533; planets; rare earths; soils; spectra; terrestrial planets; thickness ER - TY - JOUR T1 - Morphological and chemical characteristics of sediment in the Rocknest eolian sand shadow, Gale Crater, Mars AN - 1400619332; 2013-053897 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Goetz, W AU - Madsen, M B AU - Edgett, K S AU - Meslin, P Y AU - Blaney, D L AU - Bridges, N T AU - Clark, B AU - Fisk, M AU - Hviid, S F AU - Kocurek, G AU - Lasue, J AU - Maurice, S AU - Newsom, H AU - Renno, N AU - Rubin, D M AU - Sullivan, R J AU - Wiens, R C AU - Anonymous Y1 - 2013 PY - 2013 DA - 2013 EP - Abstract no. 1222 PB - Lunar and Planetary Science Conference, Houston, TX VL - 44 KW - eolian features KW - sand shadows KW - Mars KW - layered materials KW - Gale Crater KW - emission spectra KW - Curiosity Rover KW - sediments KW - LIBS spectra KW - spectra KW - chemical composition KW - sand KW - clastic sediments KW - lithium KW - cementation KW - alkali metals KW - anomalies KW - sodium KW - Rocknest KW - terrestrial planets KW - morphology KW - planets KW - metals KW - diagenesis KW - potassium KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400619332?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Morphological+and+chemical+characteristics+of+sediment+in+the+Rocknest+eolian+sand+shadow%2C+Gale+Crater%2C+Mars&rft.au=Goetz%2C+W%3BMadsen%2C+M+B%3BEdgett%2C+K+S%3BMeslin%2C+P+Y%3BBlaney%2C+D+L%3BBridges%2C+N+T%3BClark%2C+B%3BFisk%2C+M%3BHviid%2C+S+F%3BKocurek%2C+G%3BLasue%2C+J%3BMaurice%2C+S%3BNewsom%2C+H%3BRenno%2C+N%3BRubin%2C+D+M%3BSullivan%2C+R+J%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Goetz&rft.aufirst=W&rft.date=2013-01-01&rft.volume=44&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2013/pdf/1222.pdf LA - English DB - GeoRef N1 - Conference title - 44th lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 5 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on June 4, 2013 N1 - Last updated - 2013-07-18 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali metals; anomalies; cementation; chemical composition; clastic sediments; Curiosity Rover; diagenesis; emission spectra; eolian features; Gale Crater; layered materials; LIBS spectra; lithium; Mars; metals; morphology; planets; potassium; Rocknest; sand; sand shadows; sediments; sodium; spectra; terrestrial planets ER - TY - JOUR T1 - Manufactured solutions and the verification of three-dimensional Stokes ice-sheet models AN - 1328535126; 665180-2 AB - The manufactured solution technique is used for the verification of computational models in many fields. In this paper, we construct manufactured solutions for the three-dimensional, isothermal, nonlinear Stokes model for flows in glaciers and ice sheets. The solution construction procedure starts with kinematic boundary conditions and is mainly based on the solution of a first-order partial differential equation for the ice velocity that satisfies the incompressibility condition. The manufactured solutions depend on the geometry of the ice sheet, basal sliding parameters, and ice softness. Initial conditions are taken from the periodic geometry of a standard problem of the ISMIP-HOM benchmark tests. The upper surface is altered through the manufactured solution procedure to generate an analytic solution for the time-dependent flow problem. We then use this manufactured solution to verify a parallel, high-order accurate, finite element Stokes ice-sheet model. Simulation results from the computational model show good convergence to the manufactured analytic solution. JF - The Cryosphere (Online) AU - Leng, W AU - Ju, L AU - Gunzburger, M AU - Price, S Y1 - 2013 PY - 2013 DA - 2013 SP - 19 EP - 29 PB - Copernicus on behalf of the European Geosciences Union, Katlenburg-Lindau VL - 7 IS - 1 KW - kinematics KW - three-dimensional models KW - Navier-Stokes equations KW - mass balance KW - glaciers KW - mathematical models KW - glacial geology KW - ice sheets KW - deglaciation KW - boundary conditions KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328535126?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Cryosphere+%28Online%29&rft.atitle=Manufactured+solutions+and+the+verification+of+three-dimensional+Stokes+ice-sheet+models&rft.au=Leng%2C+W%3BJu%2C+L%3BGunzburger%2C+M%3BPrice%2C+S&rft.aulast=Leng&rft.aufirst=W&rft.date=2013-01-01&rft.volume=7&rft.issue=1&rft.spage=19&rft.isbn=&rft.btitle=&rft.title=The+Cryosphere+%28Online%29&rft.issn=1994-0424&rft_id=info:doi/ L2 - http://www.the-cryosphere.net/7/19/2013/tc-7-19-2013.pdf http://www.the-cryosphere.net/volumes_and_issues.html LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany N1 - Number of references - 18 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2017-01-24 N1 - SubjectsTermNotLitGenreText - boundary conditions; deglaciation; glacial geology; glaciers; ice sheets; kinematics; mass balance; mathematical models; Navier-Stokes equations; three-dimensional models ER - TY - JOUR T1 - The role of tephra studies in African paleoanthropology as exemplified by the Sidi Hakoma Tuff AN - 1320155558; 2013-030059 AB - Beginning in the 1960s, geological and paleoanthropological exploration of the Ethiopian Rift system's basins have led to the discovery and assembly of the most comprehensive record of human biological and technological change during the last 6 million years. The hominid fossils, including partial skeletons, were primarily discovered in the Afar Rift, the Main Ethiopian Rift, and in the Omo Basin of the broadly rifted zone of SW Ethiopia. The paleoanthropological research areas within the SW Afar Rift that have yielded many diverse hominid species and the oldest stone tools are, from north to south, Woranso-Mille (aff. Ardipithecus and Au. afarensis), Hadar (Au. afarensis, Homo sp.), Dikika (Au. afarensis), Gona (Ar. kadabba, Ar. ramidus, H. erectus, and oldest stone tools), Middle Awash (Ar. kadabba, Ar. ramidus, Au. anamensis, Au. afarensis, Au. garhi, H. erectus, H. rhodesiensis, H. sapiens idaltu, and the oldest paleo-butchery locality), and Galili (Au. afarensis). Additional hominid remains were discovered at Melka Kunture on the banks of the Awash River near its source along the western margin of the central part of the Main Ethiopian Rift (H. erectus), at Konso (H. erectus and A. boisei), and at the southern end of the MER, and in the Omo Basin (Au. anamensis, Au. afarensis, Au. aethiopicus, Au. boisei, H. habilis, and H. erectus). Distal and sometimes proximal tephra units interbedded within fossilifeous sedimentary deposits have become key elements in this work by providing chronological and correlative control and depositional contexts. Several regional tephra markers have been identified within the northern half of the eastern African rift valley in Ethiopia and Kenya, and in marine sediments of the Gulf of Aden Rift and the NW Indian Ocean. Out of the many regional tephra stratigraphic markers that range in age from the early Pliocene (3.97Ma) to the late Pleistocene (0.16Ma), the Sidi Hakoma Tuff (SHT) has been more widely identified and thoroughly characterized than any of the others. An age of 3.446+ or -0.041Ma was determined on the SHT according to the most recent calibration, and it is the only regional stratigraphic marker whose source has been traced to a buried caldera in the central sector of the Main Ethiopian Rift. This paper describes new SHT occurrences and presents chemical and chronological results in the context of a broader review of the importance of this key marker. Moreover, the geographic distributions, probable dispersal mechanisms, and importance of regional tephra units in determining the tectonic and sedimentological processes in the different rift basins of the eastern African rift valleys are considered. Abstract Copyright (2013) Elsevier, B.V. JF - Journal of African Earth Sciences AU - WoldeGabriel, Giday AU - Endale, Tamrat AU - White, Tim D AU - Thouveny, Nicolas AU - Hart, William K AU - Renne, Paul R AU - Asfaw, Berhane Y1 - 2013/01// PY - 2013 DA - January 2013 SP - 41 EP - 58 PB - Elsevier, Oxford VL - 77 SN - 1464-343X, 1464-343X KW - anthropology KW - volcanic rocks KW - igneous rocks KW - East Africa KW - Holocene KW - Cenozoic KW - Theria KW - East African Rift KW - Kenya KW - Ethiopia KW - Eutheria KW - Sidi Hakoma Tuff KW - Afar Depression KW - tephrochronology KW - Chordata KW - Quaternary KW - Omo Ethiopia KW - Mammalia KW - Primates KW - Hominidae KW - pyroclastics KW - Ethiopian Rift KW - Africa KW - Vertebrata KW - Tetrapoda KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1320155558?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+African+Earth+Sciences&rft.atitle=The+role+of+tephra+studies+in+African+paleoanthropology+as+exemplified+by+the+Sidi+Hakoma+Tuff&rft.au=WoldeGabriel%2C+Giday%3BEndale%2C+Tamrat%3BWhite%2C+Tim+D%3BThouveny%2C+Nicolas%3BHart%2C+William+K%3BRenne%2C+Paul+R%3BAsfaw%2C+Berhane&rft.aulast=WoldeGabriel&rft.aufirst=Giday&rft.date=2013-01-01&rft.volume=77&rft.issue=&rft.spage=41&rft.isbn=&rft.btitle=&rft.title=Journal+of+African+Earth+Sciences&rft.issn=1464343X&rft_id=info:doi/10.1016%2Fj.jafrearsci.2012.09.004 L2 - http://www.sciencedirect.com/science/journal/1464343X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Document feature - illus. incl. geol. sketch maps N1 - SuppNotes - Based on Publisher-supplied data N1 - Last updated - 2013-06-13 N1 - SubjectsTermNotLitGenreText - Afar Depression; Africa; anthropology; Cenozoic; Chordata; East Africa; East African Rift; Ethiopia; Ethiopian Rift; Eutheria; Holocene; Hominidae; igneous rocks; Kenya; Mammalia; Omo Ethiopia; Primates; pyroclastics; Quaternary; Sidi Hakoma Tuff; tephrochronology; Tetrapoda; Theria; Vertebrata; volcanic rocks DO - http://dx.doi.org/10.1016/j.jafrearsci.2012.09.004 ER - TY - JOUR T1 - Meta-Analysis Options for Inconsistent Nuclear Measurements AN - 1315705471; 17630476 AB - Meta-analysis aims to combine results from multiple experiments. For example, a neutron reaction rate or cross section is typically measured in multiple experiments, and a single estimate and its uncertainty are provided for users of the estimated reaction rate. It is often difficult to combine estimates from multiple laboratories because there can be important differences in experimental protocols among laboratories and because laboratories do not always provide all the information needed to assess the estimate's uncertainty, particularly if total uncertainty (random and systematic) is required. The paper illustrates that explicit measurement error models are essential for understanding measurement processes and for guiding how to combine multiple measurements, whether the measurements are consistent or not. We emphasize that both the consensus estimate and its estimated uncertainty depend on the assumed measurement error model, and we investigate measurement error model selection options for two examples. JF - Nuclear Science and Engineering AU - Burr, Tom AU - Williams, Brian AU - Croft, Stephen AU - White, Morgan AU - Hanson, Ken AD - Los Alamos National Laboratory, Los Alamos, New Mexico 87545 tburr@lanl.gov Y1 - 2013/01// PY - 2013 DA - Jan 2013 SP - 15 EP - 27 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 173 IS - 1 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Cross sections KW - Error analysis KW - Errors KW - Estimates KW - Uncertainty UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1315705471?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Meta-Analysis+Options+for+Inconsistent+Nuclear+Measurements&rft.au=Burr%2C+Tom%3BWilliams%2C+Brian%3BCroft%2C+Stephen%3BWhite%2C+Morgan%3BHanson%2C+Ken&rft.aulast=Burr&rft.aufirst=Tom&rft.date=2013-01-01&rft.volume=173&rft.issue=1&rft.spage=15&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-03-01 N1 - Number of references - 22 N1 - Last updated - 2013-03-11 ER - TY - JOUR T1 - Contaminant remediation decision analysis using information gap theory AN - 1291603021; 17667264 AB - Decision making under severe lack of information is a ubiquitous situation in nearly every applied field of engineering, policy, and science. A severe lack of information precludes our ability to determine a frequency of occurrence of events or conditions that impact the decision; therefore, decision uncertainties due to a severe lack of information cannot be characterized probabilistically. To circumvent this problem, information gap (info-gap) theory has been developed to explicitly recognize and quantify the implications of a severe lack of information in decision making. This paper presents a decision analysis based on info-gap theory developed for a contaminant remediation scenario. The analysis provides decision support in determining the fraction of contaminant mass to remove from the environment. An info-gap uncertainty model is developed to characterize uncertainty due to a lack of information concerning the contaminant flux. The info-gap uncertainty model groups nested, convex sets of functions defining contaminant flux over time based on their level of deviation from a nominal contaminant flux. The nominal contaminant flux defines a best estimate of contaminant flux over time based on existing, though incomplete, information. A robustness function is derived to quantify the maximum level of deviation from nominal that still ensures compliance for alternative decisions. An opportuneness function is derived to characterize the possibility of meeting a desired contaminant concentration level. The decision analysis evaluates how the robustness and opportuneness change as a function of time since remediation and as a function of the fraction of contaminant mass removed. JF - Stochastic Environmental Research and Risk Assessment AU - Harp, Dylan R AU - Vesselinov, Velimir V AD - Los Alamos National Laboratory, TA-3, Building 261, Room F200E, Los Alamos, NM, USA, dharp@lanl.gov Y1 - 2013/01// PY - 2013 DA - Jan 2013 SP - 159 EP - 168 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 27 IS - 1 SN - 1436-3240, 1436-3240 KW - Pollution Abstracts; Risk Abstracts KW - Risk assessment KW - Decision making KW - Bioremediation KW - Decision support systems KW - Compliance KW - Contaminants KW - P 9000:ENVIRONMENTAL ACTION KW - R2 23050:Environment UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1291603021?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Stochastic+Environmental+Research+and+Risk+Assessment&rft.atitle=Contaminant+remediation+decision+analysis+using+information+gap+theory&rft.au=Harp%2C+Dylan+R%3BVesselinov%2C+Velimir+V&rft.aulast=Harp&rft.aufirst=Dylan&rft.date=2013-01-01&rft.volume=27&rft.issue=1&rft.spage=159&rft.isbn=&rft.btitle=&rft.title=Stochastic+Environmental+Research+and+Risk+Assessment&rft.issn=14363240&rft_id=info:doi/10.1007%2Fs00477-012-0573-1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-01 N1 - Number of references - 30 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Risk assessment; Decision making; Bioremediation; Decision support systems; Compliance; Contaminants DO - http://dx.doi.org/10.1007/s00477-012-0573-1 ER - TY - JOUR T1 - Genetic diversity within Clostridium botulinum serotypes, botulinum neurotoxin gene clusters and toxin subtypes. AN - 1239059238; 23239346 AB - Clostridium botulinum is a species of spore-forming anaerobic bacteria defined by the expression of any one or two of seven serologically distinct botulinum neurotoxins (BoNTs) designated BoNT/A-G. This Gram-positive bacterium was first identified in 1897 and since then the paralyzing and lethal effects of its toxin have resulted in the recognition of different forms of the intoxication known as food-borne, infant, or wound botulism. Early microbiological and biochemical characterization of C. botulinum isolates revealed that the bacteria within the species had different characteristics and expressed different toxin types. To organize the variable bacterial traits within the species, Group I-IV designations were created. Interestingly, it was observed that isolates within different Groups could express the same toxin type and conversely a single Group could express different toxin types. This discordant phylogeny between the toxin and the host bacteria indicated that horizontal gene transfer of the toxin was responsible for the variation observed within the species. The recent availability of multiple C. botulinum genomic sequences has offered the ability to bioinformatically analyze the locations of the bont genes, the composition of their toxin gene clusters, and the genes flanking these regions to understand their variation. Comparison of the genomic sequences representing multiple serotypes indicates that the bont genes are not in random locations. Instead the analyses revealed specific regions where the toxin genes occur within the genomes representing serotype A, B, C, E, and F C. botulinum strains and C. butyricum type E strains. The genomic analyses have provided evidence of horizontal gene transfer, site-specific insertion, and recombination events. These events have contributed to the variation observed among the neurotoxins, the toxin gene clusters and the bacteria that contain them, and has supported the historical microbiological, and biochemical characterization of the Group classification within the species. JF - Current topics in microbiology and immunology AU - Hill, Karen K AU - Smith, Theresa J AD - Los Alamos National Laboratory, Los Alamos, NM 87545, USA. khill@lanl.gov Y1 - 2013 PY - 2013 DA - 2013 SP - 1 EP - 20 VL - 364 SN - 0070-217X, 0070-217X KW - Neurotoxins KW - 0 KW - Botulinum Toxins KW - EC 3.4.24.69 KW - Index Medicus KW - Phylogeny KW - Neurotoxins -- classification KW - Plasmids -- genetics KW - Neurotoxins -- genetics KW - Open Reading Frames KW - Operon KW - Chromosomes, Bacterial -- genetics KW - Chromosome Mapping KW - Base Sequence KW - Gene Transfer, Horizontal KW - Recombination, Genetic KW - Species Specificity KW - Mutation KW - Mutagenesis, Insertional KW - Genetic Variation KW - Genes, Bacterial KW - Clostridium botulinum -- classification KW - Multigene Family KW - Botulinum Toxins -- genetics KW - Clostridium botulinum -- genetics KW - Botulinum Toxins -- classification UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1239059238?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Current+topics+in+microbiology+and+immunology&rft.atitle=Genetic+diversity+within+Clostridium+botulinum+serotypes%2C+botulinum+neurotoxin+gene+clusters+and+toxin+subtypes.&rft.au=Hill%2C+Karen+K%3BSmith%2C+Theresa+J&rft.aulast=Hill&rft.aufirst=Karen&rft.date=2013-01-01&rft.volume=364&rft.issue=&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Current+topics+in+microbiology+and+immunology&rft.issn=0070217X&rft_id=info:doi/10.1007%2F978-3-642-33570-9_1 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2013-04-04 N1 - Date created - 2012-12-14 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1007/978-3-642-33570-9_1 ER - TY - CPAPER T1 - The Circularity of the IBEX Energetic Neutral Atom (ENA) Ribbon T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313120289; 6192342 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Funsten, Herbert AU - Frisch, Priscilla AU - Higdon, David AU - Janzen, Paul AU - Livadiotis, George AU - McComas, David AU - Reese, Shane AU - Reisenfeld, Daniel AU - Schwadron, Nathan Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313120289?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=The+Circularity+of+the+IBEX+Energetic+Neutral+Atom+%28ENA%29+Ribbon&rft.au=Funsten%2C+Herbert%3BFrisch%2C+Priscilla%3BHigdon%2C+David%3BJanzen%2C+Paul%3BLivadiotis%2C+George%3BMcComas%2C+David%3BReese%2C+Shane%3BReisenfeld%2C+Daniel%3BSchwadron%2C+Nathan&rft.aulast=Funsten&rft.aufirst=Herbert&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Model Simulation and Remote Electric Field Change Measurement Show Return Stroke Current Travels in a Dispersive and Lossy Manner T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313119738; 6181729 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Shao, Xuan-Min AU - Lay, Erin AU - Jacobson, Abram Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Electric fields KW - Simulation KW - Stroke KW - Travel KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313119738?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Model+Simulation+and+Remote+Electric+Field+Change+Measurement+Show+Return+Stroke+Current+Travels+in+a+Dispersive+and+Lossy+Manner&rft.au=Shao%2C+Xuan-Min%3BLay%2C+Erin%3BJacobson%2C+Abram&rft.aulast=Shao&rft.aufirst=Xuan-Min&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Multi-scale Measurements and Modeling of Greenhouse Gas and Pollutant Emissions from Coal Power Plants and Gas Mining at Four Corners T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313119607; 6182814 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Dubey, Manvendra AU - Lindenmaier, Rodica AU - Henderson, Bradley AU - Costigan, Keeley AU - Lee, Sang-Hyun AU - Herman, Jay AU - Love, Steven AU - Rahn, Thom AU - Arata, Caleb AU - Butterfield, Zachary AU - Chylek, Petr AU - Reisner, Jon AU - Porch, W Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Coal KW - Greenhouse gases KW - Power plants KW - Emission measurements KW - Mining KW - Emissions KW - Climatic changes KW - Pollutants UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313119607?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Multi-scale+Measurements+and+Modeling+of+Greenhouse+Gas+and+Pollutant+Emissions+from+Coal+Power+Plants+and+Gas+Mining+at+Four+Corners&rft.au=Dubey%2C+Manvendra%3BLindenmaier%2C+Rodica%3BHenderson%2C+Bradley%3BCostigan%2C+Keeley%3BLee%2C+Sang-Hyun%3BHerman%2C+Jay%3BLove%2C+Steven%3BRahn%2C+Thom%3BArata%2C+Caleb%3BButterfield%2C+Zachary%3BChylek%2C+Petr%3BReisner%2C+Jon%3BPorch%2C+W&rft.aulast=Dubey&rft.aufirst=Manvendra&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - A method for tracking subsurface fronts of stress-induced permeability enhancement T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313118571; 6190160 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Lewis, Kayla Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Permeability KW - Tracking UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313118571?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=A+method+for+tracking+subsurface+fronts+of+stress-induced+permeability+enhancement&rft.au=Lewis%2C+Kayla&rft.aulast=Lewis&rft.aufirst=Kayla&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Experimental Studies of Gravitational Stability and CO2 Dissolution T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313118310; 6181254 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Newell, Dennis AU - Carey, James AU - Backhaus, Scott AU - Klein, Benjamin Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Carbon dioxide KW - Dissolution KW - Gravity UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313118310?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Experimental+Studies+of+Gravitational+Stability+and+CO2+Dissolution&rft.au=Newell%2C+Dennis%3BCarey%2C+James%3BBackhaus%2C+Scott%3BKlein%2C+Benjamin&rft.aulast=Newell&rft.aufirst=Dennis&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Laboratory Observation Of Magnetic Field Growth Driven By Shear Flow T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313118103; 6181080 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Intrator, Thomas AU - Sun, Xuan AU - Dorf, Lennie AU - Sears, Jason AU - Weber, Thomas AU - Lapenta, Giovanni Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Magnetic fields KW - Shear flow KW - Growth UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313118103?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Laboratory+Observation+Of+Magnetic+Field+Growth+Driven+By+Shear+Flow&rft.au=Intrator%2C+Thomas%3BSun%2C+Xuan%3BDorf%2C+Lennie%3BSears%2C+Jason%3BWeber%2C+Thomas%3BLapenta%2C+Giovanni&rft.aulast=Intrator&rft.aufirst=Thomas&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Mesoscopic Modeling of Reactive Transport Processes T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313117817; 6181147 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Kang, Qinjun AU - Chen, Li AU - Deng, Hailin Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Transport processes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313117817?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Mesoscopic+Modeling+of+Reactive+Transport+Processes&rft.au=Kang%2C+Qinjun%3BChen%2C+Li%3BDeng%2C+Hailin&rft.aulast=Kang&rft.aufirst=Qinjun&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Acoustic Analysis of Plutonium and Nuclear Weapon Components at Los Alamos National Laboratory T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313117493; 6189989 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Saleh, Tarik AU - Reynolds, Joseph AU - Rowe, Charlotte AU - Freibert, Franz AU - Ten Cate, James AU - Ulrich, Timothy AU - Farrow, Adam Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - USA, New Mexico, Los Alamos KW - Nuclear weapons KW - Acoustics KW - Plutonium KW - Weapons UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313117493?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Acoustic+Analysis+of+Plutonium+and+Nuclear+Weapon+Components+at+Los+Alamos+National+Laboratory&rft.au=Saleh%2C+Tarik%3BReynolds%2C+Joseph%3BRowe%2C+Charlotte%3BFreibert%2C+Franz%3BTen+Cate%2C+James%3BUlrich%2C+Timothy%3BFarrow%2C+Adam&rft.aulast=Saleh&rft.aufirst=Tarik&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Next Generation Carbon-Nitrogen Dynamics Model T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313114501; 6184921 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Xu, Chonggang AU - Fisher, Rosie AU - Vrugt, Jasper AU - Wullschleger, Stan AU - McDowell, Nathan Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313114501?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Next+Generation+Carbon-Nitrogen+Dynamics+Model&rft.au=Xu%2C+Chonggang%3BFisher%2C+Rosie%3BVrugt%2C+Jasper%3BWullschleger%2C+Stan%3BMcDowell%2C+Nathan&rft.aulast=Xu&rft.aufirst=Chonggang&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Observational needs for ice sheet modeling T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313113910; 6193180 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Price, Stephen Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Ice KW - Glaciation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313113910?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Observational+needs+for+ice+sheet+modeling&rft.au=Price%2C+Stephen&rft.aulast=Price&rft.aufirst=Stephen&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Radiation Belt Data Assimilation Using a Magnetically Self-consistent Inner Magnetosphere Model RAM-SCB T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313113428; 6184747 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Yu, Yiqun AU - Koller, Josef AU - Godinez, Humberto AU - Zaharia, Sorin AU - Jordanova, Vania Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Data collection KW - Radiation KW - Data processing KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313113428?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Radiation+Belt+Data+Assimilation+Using+a+Magnetically+Self-consistent+Inner+Magnetosphere+Model+RAM-SCB&rft.au=Yu%2C+Yiqun%3BKoller%2C+Josef%3BGodinez%2C+Humberto%3BZaharia%2C+Sorin%3BJordanova%2C+Vania&rft.aulast=Yu&rft.aufirst=Yiqun&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Multi-point Measurements of Radiation Belt Electron Phase Space Density Gradients T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313112993; 6183901 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Reeves, Geoffrey AU - Spence, Harlan Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Density gradients KW - Radiation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313112993?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Multi-point+Measurements+of+Radiation+Belt+Electron+Phase+Space+Density+Gradients&rft.au=Reeves%2C+Geoffrey%3BSpence%2C+Harlan&rft.aulast=Reeves&rft.aufirst=Geoffrey&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Model Simulation and Remote Electric Field Change Measurement Show Return Stroke Current Travels in a Dispersive and Lossy Manner T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313110560; 6191366 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Shao, Xuan-Min AU - Lay, Erin AU - Jacobson, Abram Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Electric fields KW - Simulation KW - Stroke KW - Travel KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313110560?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Model+Simulation+and+Remote+Electric+Field+Change+Measurement+Show+Return+Stroke+Current+Travels+in+a+Dispersive+and+Lossy+Manner&rft.au=Shao%2C+Xuan-Min%3BLay%2C+Erin%3BJacobson%2C+Abram&rft.aulast=Shao&rft.aufirst=Xuan-Min&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Application of Moment Tensor Inversion to Source Physics Experiments: A Method Accommodating Space-Time Distributed Explosion Sources T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313110439; 6182665 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Patton, Howard AU - Yang, Xiaoning Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Inversion KW - Explosions UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313110439?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Application+of+Moment+Tensor+Inversion+to+Source+Physics+Experiments%3A+A+Method+Accommodating+Space-Time+Distributed+Explosion+Sources&rft.au=Patton%2C+Howard%3BYang%2C+Xiaoning&rft.aulast=Patton&rft.aufirst=Howard&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - SALSA3D: Validating a Global 3D P-Velocity Model of the Earth"s Crust and Mantle for Improved Event Location T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313109630; 6179826 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Begnaud, Michael AU - Ballard, Sanford AU - Young, Christopher AU - Hipp, James AU - Encarnacao, Andre AU - Phillips, W AU - Chael, Eric AU - Rowe, Charlotte Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Earth crust KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313109630?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=SALSA3D%3A+Validating+a+Global+3D+P-Velocity+Model+of+the+Earth%22s+Crust+and+Mantle+for+Improved+Event+Location&rft.au=Begnaud%2C+Michael%3BBallard%2C+Sanford%3BYoung%2C+Christopher%3BHipp%2C+James%3BEncarnacao%2C+Andre%3BPhillips%2C+W%3BChael%2C+Eric%3BRowe%2C+Charlotte&rft.aulast=Begnaud&rft.aufirst=Michael&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Plasma Sources and Magnetospheric Consequences at Saturn T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313106684; 6194202 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Thomsen, Michelle Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313106684?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Plasma+Sources+and+Magnetospheric+Consequences+at+Saturn&rft.au=Thomsen%2C+Michelle&rft.aulast=Thomsen&rft.aufirst=Michelle&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Column and in situ CO2, 13CO2, CO and NO2 increases by power plants: New constraints on emissions T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313099257; 6184845 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Lindenmaier, Rodica AU - Dubey, Manvendra AU - Butterfield, Zachary AU - Herman, Jay AU - Arata, Caleb AU - Henderson, Bradley AU - Rahn, Thom Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Power plants KW - Emissions KW - Carbon dioxide KW - Carbon monoxide UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313099257?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Column+and+in+situ+CO2%2C+13CO2%2C+CO+and+NO2+increases+by+power+plants%3A+New+constraints+on+emissions&rft.au=Lindenmaier%2C+Rodica%3BDubey%2C+Manvendra%3BButterfield%2C+Zachary%3BHerman%2C+Jay%3BArata%2C+Caleb%3BHenderson%2C+Bradley%3BRahn%2C+Thom&rft.aulast=Lindenmaier&rft.aufirst=Rodica&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Enhancements to the Bayesian Infrasound Source Location Method using Physics-based Priors T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313098074; 6188932 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Marcillo, Omar AU - Arrowsmith, Stephen AU - Whitaker, Rodney AU - Anderson, Dale AU - Nippress, Alexandra AU - Green, David Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Infrasound KW - Bayesian analysis UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313098074?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Enhancements+to+the+Bayesian+Infrasound+Source+Location+Method+using+Physics-based+Priors&rft.au=Marcillo%2C+Omar%3BArrowsmith%2C+Stephen%3BWhitaker%2C+Rodney%3BAnderson%2C+Dale%3BNippress%2C+Alexandra%3BGreen%2C+David&rft.aulast=Marcillo&rft.aufirst=Omar&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Substorm Injections and the Generation of Whistler Chorus Waves T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313097866; 6188836 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Reeves, Geoffrey AU - MacDonald, Elizabeth AU - Funsten, Herbert AU - Skoug, Ruth AU - Thomsen, Michelle AU - Gary, S AU - Jordanova, Vania AU - Henderson, Michael AU - Friedel, Reiner AU - Spence, Harlan AU - Kletzing, Craig Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Wave generation KW - Waves UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313097866?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Substorm+Injections+and+the+Generation+of+Whistler+Chorus+Waves&rft.au=Reeves%2C+Geoffrey%3BMacDonald%2C+Elizabeth%3BFunsten%2C+Herbert%3BSkoug%2C+Ruth%3BThomsen%2C+Michelle%3BGary%2C+S%3BJordanova%2C+Vania%3BHenderson%2C+Michael%3BFriedel%2C+Reiner%3BSpence%2C+Harlan%3BKletzing%2C+Craig&rft.aulast=Reeves&rft.aufirst=Geoffrey&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Glacier Sliding Feedbacks in a Coupled Subglacial Hydrology and Ice Dynamics Model T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313095629; 6194604 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Hoffman, Matthew AU - Price, Stephen AU - Creyts, Timothy Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Ice KW - Hydrology KW - Glaciers KW - Slumping KW - Feedback KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313095629?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Glacier+Sliding+Feedbacks+in+a+Coupled+Subglacial+Hydrology+and+Ice+Dynamics+Model&rft.au=Hoffman%2C+Matthew%3BPrice%2C+Stephen%3BCreyts%2C+Timothy&rft.aulast=Hoffman&rft.aufirst=Matthew&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Characterization of the Source Physics Experiment Site T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313094733; 6191754 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Sussman, Aviva AU - Schultz-Fellenz, Emily AU - Broome, Scott AU - Townsend, Margaret AU - Abbott, Robert AU - Snelson, Catherine AU - Cogbill, Allen AU - Conklin, Gregory AU - Mitra, Gautam AU - Sabbeth, Leah Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313094733?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Characterization+of+the+Source+Physics+Experiment+Site&rft.au=Sussman%2C+Aviva%3BSchultz-Fellenz%2C+Emily%3BBroome%2C+Scott%3BTownsend%2C+Margaret%3BAbbott%2C+Robert%3BSnelson%2C+Catherine%3BCogbill%2C+Allen%3BConklin%2C+Gregory%3BMitra%2C+Gautam%3BSabbeth%2C+Leah&rft.aulast=Sussman&rft.aufirst=Aviva&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Climatic controls on summer fog and low stratus cloudiness in coastal southern California, USA T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313094245; 6191619 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Williams, Park AU - Michaelsen, Joel AU - Johnstone, James AU - Still, Christopher Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - USA, California KW - Summer KW - Fog KW - Climate KW - Cloud cover UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313094245?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Climatic+controls+on+summer+fog+and+low+stratus+cloudiness+in+coastal+southern+California%2C+USA&rft.au=Williams%2C+Park%3BMichaelsen%2C+Joel%3BJohnstone%2C+James%3BStill%2C+Christopher&rft.aulast=Williams&rft.aufirst=Park&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Chemical Composition of Rocks and Soils at Gale Crater, Mars T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313089312; 6190553 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Wiens, Roger AU - Gellert, Ralf AU - Maurice, Sylvestre Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Soil KW - Chemical composition KW - Craters KW - Storms UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313089312?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Chemical+Composition+of+Rocks+and+Soils+at+Gale+Crater%2C+Mars&rft.au=Wiens%2C+Roger%3BGellert%2C+Ralf%3BMaurice%2C+Sylvestre&rft.aulast=Wiens&rft.aufirst=Roger&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Electrical modification of D-layer electron distribution by local thunderstorm T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313084118; 6190909 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Lay, Erin AU - Shao, Xuan-Min AU - Jacobson, Abram Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Thunderstorms KW - Weather UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313084118?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Electrical+modification+of+D-layer+electron+distribution+by+local+thunderstorm&rft.au=Lay%2C+Erin%3BShao%2C+Xuan-Min%3BJacobson%2C+Abram&rft.aulast=Lay&rft.aufirst=Erin&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - MHD Turbulence: Intermittency, Imbalance and Residual Energy T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313081206; 6190045 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Beresnyak, Andrey Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Turbulence KW - Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313081206?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=MHD+Turbulence%3A+Intermittency%2C+Imbalance+and+Residual+Energy&rft.au=Beresnyak%2C+Andrey&rft.aulast=Beresnyak&rft.aufirst=Andrey&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - A co-volume scheme for the rotating shallow water equations on conforming non-orthogonal grids T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313079413; 6188956 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Chen, Qingshan AU - Ringler, Todd AU - Gunzburger, Max Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Shallow water KW - Mathematical models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313079413?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=A+co-volume+scheme+for+the+rotating+shallow+water+equations+on+conforming+non-orthogonal+grids&rft.au=Chen%2C+Qingshan%3BRingler%2C+Todd%3BGunzburger%2C+Max&rft.aulast=Chen&rft.aufirst=Qingshan&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Spatiotemporal patterns of drought, fire, and insect disturbance and resulting biomass dynamics in forests of the southwestern US: Results from multiscale satellite image analysis, 1990-2011 T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313075588; 6192607 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Garrity, Steven AU - Allen, Craig AU - Brumby, Steven AU - Hicke, Jeffrey AU - Meddens, Arjan AU - Williams, Park AU - Cai, Michael AU - McDowell, Nate Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Insects KW - Fires KW - Combustion products KW - Forests KW - Satellites KW - Remote sensing KW - Droughts KW - Disturbance KW - Biomass KW - Aquatic insects KW - Image processing UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313075588?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Spatiotemporal+patterns+of+drought%2C+fire%2C+and+insect+disturbance+and+resulting+biomass+dynamics+in+forests+of+the+southwestern+US%3A+Results+from+multiscale+satellite+image+analysis%2C+1990-2011&rft.au=Garrity%2C+Steven%3BAllen%2C+Craig%3BBrumby%2C+Steven%3BHicke%2C+Jeffrey%3BMeddens%2C+Arjan%3BWilliams%2C+Park%3BCai%2C+Michael%3BMcDowell%2C+Nate&rft.aulast=Garrity&rft.aufirst=Steven&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Keeping Enceladus Warm T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313070475; 6194313 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Travis, Bryan AU - Schubert, Gerald Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313070475?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Keeping+Enceladus+Warm&rft.au=Travis%2C+Bryan%3BSchubert%2C+Gerald&rft.aulast=Travis&rft.aufirst=Bryan&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Recent advances in particle methods for simulating solute transport in the subsurface T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313068659; 6191924 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Painter, Scott Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Particulates KW - Solutes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313068659?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Recent+advances+in+particle+methods+for+simulating+solute+transport+in+the+subsurface&rft.au=Painter%2C+Scott&rft.aulast=Painter&rft.aufirst=Scott&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Uncertainty Quantification and the Development of Ocean Model Testbeds T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313066988; 6181192 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Hecht, Matthew AU - Bhat, K AU - Gattiker, James Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Oceans KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313066988?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Uncertainty+Quantification+and+the+Development+of+Ocean+Model+Testbeds&rft.au=Hecht%2C+Matthew%3BBhat%2C+K%3BGattiker%2C+James&rft.aulast=Hecht&rft.aufirst=Matthew&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Long-term changes in regular and low-frequency earthquake inter-event times near Parkfield, CA T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313066021; 6191451 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Wu, Chunquan AU - Shelly, David AU - Johnson, Paul AU - Gomberg, Joan AU - Peng, Zhigang Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Earthquakes KW - Seismic activity KW - Long-term changes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313066021?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Long-term+changes+in+regular+and+low-frequency+earthquake+inter-event+times+near+Parkfield%2C+CA&rft.au=Wu%2C+Chunquan%3BShelly%2C+David%3BJohnson%2C+Paul%3BGomberg%2C+Joan%3BPeng%2C+Zhigang&rft.aulast=Wu&rft.aufirst=Chunquan&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Generation and Loss of New Inner Belts Associated with Solar Energetic Particle Events: A Perspective from Multiple-Satellite Observations T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313065850; 6183915 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Chen, Yue AU - Larsen, Brian AU - Friedel, Reiner Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Particulates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313065850?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Generation+and+Loss+of+New+Inner+Belts+Associated+with+Solar+Energetic+Particle+Events%3A+A+Perspective+from+Multiple-Satellite+Observations&rft.au=Chen%2C+Yue%3BLarsen%2C+Brian%3BFriedel%2C+Reiner&rft.aulast=Chen&rft.aufirst=Yue&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - What can NSC tell us about tree drought mortality mechanism?: An meta-analysis of results from several experiments on southwest US species T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313059299; 6182379 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Adams, Henry AU - Dickman, Lee AU - Sevanto, Sanna AU - McDowell, Nathan AU - Pockman, William AU - Breshears, David AU - Huxman, Travis Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Droughts KW - Mortality KW - Trees KW - Reviews UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313059299?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=What+can+NSC+tell+us+about+tree+drought+mortality+mechanism%3F%3A+An+meta-analysis+of+results+from+several+experiments+on+southwest+US+species&rft.au=Adams%2C+Henry%3BDickman%2C+Lee%3BSevanto%2C+Sanna%3BMcDowell%2C+Nathan%3BPockman%2C+William%3BBreshears%2C+David%3BHuxman%2C+Travis&rft.aulast=Adams&rft.aufirst=Henry&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Structure Modeling and Validation applied to Source Physics Experiments (SPEs) T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313053758; 6182116 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Larmat, Carene AU - Rowe, Charlotte AU - Patton, Howard Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313053758?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Structure+Modeling+and+Validation+applied+to+Source+Physics+Experiments+%28SPEs%29&rft.au=Larmat%2C+Carene%3BRowe%2C+Charlotte%3BPatton%2C+Howard&rft.aulast=Larmat&rft.aufirst=Carene&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Model-driven decision support for monitoring network design: methods and applications T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313051595; 6184624 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Vesselinov, Velimir AU - Harp, Dylan AU - Mishra, Phoolendra AU - Katzman, Danny Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Decision support systems UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313051595?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Model-driven+decision+support+for+monitoring+network+design%3A+methods+and+applications&rft.au=Vesselinov%2C+Velimir%3BHarp%2C+Dylan%3BMishra%2C+Phoolendra%3BKatzman%2C+Danny&rft.aulast=Vesselinov&rft.aufirst=Velimir&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - A co-volume scheme for the rotating shallow water equations on conforming non-orthogonal grids T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313051338; 6179319 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Chen, Qingshan AU - Ringler, Todd AU - Gunzburger, Max Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Shallow water KW - Mathematical models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313051338?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=A+co-volume+scheme+for+the+rotating+shallow+water+equations+on+conforming+non-orthogonal+grids&rft.au=Chen%2C+Qingshan%3BRingler%2C+Todd%3BGunzburger%2C+Max&rft.aulast=Chen&rft.aufirst=Qingshan&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Exploring a Global Multi-Resolution Modeling Approach Using a Hierarchical Modeling Approach T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313050717; 6181266 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Rauscher, Sara AU - Ringler, Todd AU - Dong, Li Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313050717?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Exploring+a+Global+Multi-Resolution+Modeling+Approach+Using+a+Hierarchical+Modeling+Approach&rft.au=Rauscher%2C+Sara%3BRingler%2C+Todd%3BDong%2C+Li&rft.aulast=Rauscher&rft.aufirst=Sara&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Next Generation Carbon-Nitrogen Dynamics Model T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313039079; 6194558 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Xu, Chonggang AU - Fisher, Rosie AU - Vrugt, Jasper AU - Wullschleger, Stan AU - McDowell, Nathan Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313039079?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Next+Generation+Carbon-Nitrogen+Dynamics+Model&rft.au=Xu%2C+Chonggang%3BFisher%2C+Rosie%3BVrugt%2C+Jasper%3BWullschleger%2C+Stan%3BMcDowell%2C+Nathan&rft.aulast=Xu&rft.aufirst=Chonggang&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Extracting Earth attenuation from seismic noise T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313033420; 6188824 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Zhang, Jian AU - Yang, Xiaoning Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Noise levels UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313033420?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Extracting+Earth+attenuation+from+seismic+noise&rft.au=Zhang%2C+Jian%3BYang%2C+Xiaoning&rft.aulast=Zhang&rft.aufirst=Jian&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Impact of the leaked CO2 from deep reservoirs on quality of shallow groundwater T2 - 2012 American Geophysical Union Fall Meeting (AGU 2012) AN - 1313032618; 6194727 JF - 2012 American Geophysical Union Fall Meeting (AGU 2012) AU - Dai, Zhenxue AU - Keating, Elizabeth AU - Viswanathan, Hari AU - Pawar, Rajesh AU - Bacon, Diana AU - Carroll, Susan Y1 - 2012/12/03/ PY - 2012 DA - 2012 Dec 03 KW - Ground water KW - Reservoirs KW - Carbon dioxide UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313032618?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.atitle=Impact+of+the+leaked+CO2+from+deep+reservoirs+on+quality+of+shallow+groundwater&rft.au=Dai%2C+Zhenxue%3BKeating%2C+Elizabeth%3BViswanathan%2C+Hari%3BPawar%2C+Rajesh%3BBacon%2C+Diana%3BCarroll%2C+Susan&rft.aulast=Dai&rft.aufirst=Zhenxue&rft.date=2012-12-03&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+American+Geophysical+Union+Fall+Meeting+%28AGU+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://fallmeeting.agu.org/2012/scientific-program/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Long-term change of site response after the M (sub W) 9.0 Tohoku earthquake in Japan AN - 1828846702; 2016-085991 AB - The recent M (sub W) 9.0 off the Pacific coast of Tohoku earthquake is the largest recorded earthquake in Japan's history. The Tohoku main shock and its aftershocks generated widespread strong shakings as large as approximately 3000 Gal along the east coast of Japan. Wu and Peng (2011) found clear drop of resonant frequency of up to 70% during the Tohoku main shock at 6 sites and correlation of resonance (peak) frequency and peak ground acceleration (PGA) during the main shock. Here we follow that study and systematically analyze long-term changes of material properties in the shallow crust from one year before to 5 months after the Tohoku main shock, using seismic data recorded by the Japanese Strong Motion Network KiK-Net. We use sliding window spectral ratios computed from a pair of surface and borehole stations to track the temporal changes in the site response of 6 sites. Our results show two stages of logarithmic recovery after a sharp drop of resonance frequency during the Tohoku main shock. The first stage is a rapid recovery within several hundred seconds to several hours, and the second stage is a slow recovery of more than five months. We also investigate whether the damage caused by the Tohoku main shock could make the near surface layers more susceptible to further damages, but we do not observe clear changes in susceptibility to further damage before and after the Tohoku main shock. Copyright 2012 The Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan JF - Earth, Planets and Space AU - Wu, Chunquan AU - Peng, Zhigang Y1 - 2012/12// PY - 2012 DA - December 2012 SP - 1259 EP - 1266 PB - Terra Scientific Publishing Company (TERRAPUB), Tokyo VL - 64 IS - 12 SN - 1343-8832, 1343-8832 KW - Tohoku-Oki earthquake 2011 KW - Far East KW - acceleration KW - seismic response KW - aftershocks KW - resonance KW - strong motion KW - main shocks KW - KiK-Net KW - ground motion KW - propagation KW - seismic networks KW - Asia KW - earthquakes KW - Japan KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1828846702?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Earth%2C+Planets+and+Space&rft.atitle=Long-term+change+of+site+response+after+the+M+%28sub+W%29+9.0+Tohoku+earthquake+in+Japan&rft.au=Wu%2C+Chunquan%3BPeng%2C+Zhigang&rft.aulast=Wu&rft.aufirst=Chunquan&rft.date=2012-12-01&rft.volume=64&rft.issue=12&rft.spage=1259&rft.isbn=&rft.btitle=&rft.title=Earth%2C+Planets+and+Space&rft.issn=13438832&rft_id=info:doi/10.5047%2Feps.2012.05.012 L2 - http://www.terrapub.co.jp/journals/EPS/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2016-01-01 N1 - Number of references - 33 N1 - Document feature - illus. incl. sketch map N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - acceleration; aftershocks; Asia; earthquakes; Far East; ground motion; Japan; KiK-Net; main shocks; propagation; resonance; seismic networks; seismic response; strong motion; Tohoku-Oki earthquake 2011 DO - http://dx.doi.org/10.5047/eps.2012.05.012 ER - TY - JOUR T1 - Keeping Enceladus warm AN - 1660632200; 2015-018339 AB - Despite its small size, Enceladus emits considerable heat, especially at its south pole, even long after simple thermal models predict it should be frozen. A number of energy mechanisms have been proposed as responsible for this heating, such as TDH (tidal dissipative heating), and convection and shearing in the ice shell, but why energy outflow is primarily at the south pole is still debated. It is not known if TDH has operated continuously at Enceladus. Crater relaxation simulations suggest considerable heat flow has occurred over long stretches of its history. One process missing from previous models is fluid flow, both in an ocean layer and in the silicate core. The simulations described here are part of a study to estimate the impact of hydrothermal flow and to explore under what conditions, and for how long, an ocean layer could persist on Enceladus, with or without TDH. Our model geometry is 2-D spherical (radius and latitude) for most simulations, with one 3-D spherical simulation. We assume a silicate core of about 160 km radius, overlain by an H (sub 2) O layer out to 250 km radius. Ice shell thickness is initially 15 km. Flow in an ocean layer is represented by a simplified Navier-Stokes model, and porous flow occurs in the core. Surface temperature distribution follows observed values. Radiogenic heating produces about 0.3 GW in the model. A simple TDH model is active in some simulations. Salts and/or NH (sub 3) may be present in the interior of Enceladus, and would strongly depress freezing; our model uses a low eutectic salt as an analog. The ice shell's thickness is not required to remain fixed, but can change dynamically, in response to local thermodynamics. Initial core temperature and permeability are unknowns. Initial core temperature is varied over several hundred degrees C, and permeability is varied over 1-100 millidarcies. In our simulations, typically, a flow field develops characterized by sinking flow at the equator and rising plumes at the poles. A broad thickening of ice in the equatorial region occurs, so much so that flow is gradually restricted to the polar regions, with the south pole flow stronger than at the northern pole. A feedback develops; cooler, sinking flow at the equator results in thickening of the ice there which in turn tends to isolate flow to the deeper ocean plus core region at the poles. The rate at which this pattern develops depends on the presence or absence of TDH. Except at the surface, a nearly cylindrical region from north to south through the model remains fluid. The presence of salt and/or NH (sub 3) allows liquid conditions and flow even as the ocean temperature falls well below 0 degrees C. At higher initial core temperatures, boiling occurs deep in the core because of the low overburden pressure. An approximately 70 km thick difference in ice thickness can develop between equator and poles. However, due to the low gravity of Enceladus, this would give rise to a buoyant pressure difference of only about 5 bars, which is less than shear strength measurements in ice. The core slowly cools, and eventually the ocean may freeze completely without TDH, but that can take on the order of several hundred million years or more. If episodes of strong TDH occurred on that time scale or shorter, a polar ocean might then persist indefinitely. JF - American Geophysical Union Fall Meeting AU - Travis, B J AU - Schubert, G AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P32A EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632200?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Keeping+Enceladus+warm&rft.au=Travis%2C+B+J%3BSchubert%2C+G%3BAnonymous&rft.aulast=Travis&rft.aufirst=B&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Machine learning methods for hydrofacies delineation AN - 1648908716; 2015-008642 AB - Heterogeneous aquifers typically consist of multiple hydrofacies, whose spatial arrangement significantly affects flow and transport. The estimation of these hydrofacies is complicated by the scarcity of data and by the lack of a clear correlation between identifiable geologic indicators and attributes. We discuss machine learning techniques for forward and inverse problems of facies delineation. Support vector machines, nearest neighbor classifiers, or geostatistics are used to solve the forward problem of reconstructing boundaries from measurements of system parameters (e.g., hydraulic conductivity). Total variation regularization (TVD) is used to estimate both the spatial extent of hydrofacies and their properties from sparse measurements of hydraulic conductivity and hydraulic head. Our approach is to minimize a functional defined on the vectors of values of hydraulic conductivity and hydraulic head fields defined on regular grids at a user-determined resolution. JF - American Geophysical Union Fall Meeting AU - Tartakovsky, D M AU - Wohlberg, B E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H41L EP - 05 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1648908716?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Machine+learning+methods+for+hydrofacies+delineation&rft.au=Tartakovsky%2C+D+M%3BWohlberg%2C+B+E%3BAnonymous&rft.aulast=Tartakovsky&rft.aufirst=D&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-29 N1 - CODEN - #07548 ER - TY - JOUR T1 - Time-varying subspace dimensionality; useful as a seismic signal detection method? AN - 1648908288; 2015-008718 AB - We explore the application of dimensional analysis to the problem of anomaly detection in multichannel time series. These techniques, which have been used for real-time load management in large computer systems, revolve around the time-varying dimensionality estimates of the signal subspace. Our application is to multiple channels of incoming seismic waveform data, as from a large array or across a network. Subspace analysis has been applied to seismic data before, but the routine use of the method is for the identification of a particular signal type, and requires a priori information about the range of signals for which the algorithm is searching. In this paradigm, a known but variable source (such as a mining region or aftershock sequence) provides known waveforms that are assumed to span the space occupied by incoming events of interest. Singular value decomposition or principal components analysis of the identified waveforms will allow for the selection of basis vectors that define the subspace onto which incoming signals are projected, to determine whether they belong to the source population of interest. In our application we do not seek to compare incoming signals to previously identified waveforms, but instead we seek to detect anomalies from the background behavior across an array or network. The background seismic levels will describe a signal space whose dimension may change markedly when an earthquake or other signal of interest occurs. We explore a variety of means by which we can evaluate the time-varying dimensionality of the signal space, and we compare the detection performance to other standard event detection methods. JF - American Geophysical Union Fall Meeting AU - Rowe, C A AU - Stead, R J AU - Begnaud, M L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract IN23A EP - 1492 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1648908288?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Time-varying+subspace+dimensionality%3B+useful+as+a+seismic+signal+detection+method%3F&rft.au=Rowe%2C+C+A%3BStead%2C+R+J%3BBegnaud%2C+M+L%3BAnonymous&rft.aulast=Rowe&rft.aufirst=C&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-29 N1 - CODEN - #07548 ER - TY - JOUR T1 - Recent advances in particle methods for simulating solute transport in the subsurface AN - 1648908257; 2015-008673 AB - Particle methods such as random walk particle tracking have a long history as numerical tools for simulating solute transport in the subsurface. In the traditional random walk particle tracking algorithm, particles representing packets of solute mass are moved through the velocity field obtained from a numerical flow solution to simulate advection; random spatial displacements are then added to simulate dispersion. The two well-known advantages of the approach are that it is relatively efficient for large problems and free of numerical dispersion. Recent large-scale applications have prompted the development of novel variants of particle methods that offer additional advantages. Interchanging the role of time and space - that is, sampling a residence time with a fixed displacement instead of a random displacement with a fixed time step - leads to a particularly efficient algorithm that also easily accommodates a very wide range of models for solute diffusion/sorption in immobile regions. Algorithms and computer codes that accommodate fully unstructured grids have recently appeared. In applications that involve significant parameter uncertainty, the Monte Carlo sampling of uncertain parameters may be intermingled with the Monte Carlo solution method, which leads to a particularly efficient estimate of the ensemble mean concentration or breakthrough curve. Methods for post-processing relatively simple particle tracking scenarios to include effects of matrix diffusion/sorption also allow uncertainty to be quantified in an efficient way. These and other recent developments will be reviewed; example applications involving radionuclide transport over long time and space scales will also be presented. JF - American Geophysical Union Fall Meeting AU - Painter, S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H42E EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1648908257?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Recent+advances+in+particle+methods+for+simulating+solute+transport+in+the+subsurface&rft.au=Painter%2C+S%3BAnonymous&rft.aulast=Painter&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-29 N1 - CODEN - #07548 ER - TY - JOUR T1 - CO (sub 2) gas fluidization possible origin of Martian polar gullies AN - 1645575522; 2015-005515 AB - Martian gully landforms, indicative of rapid flow of sediment down steep slopes, have been cited as evidence of the action of nearsurface liquid water in Mars' recent past. Gullies in polar regions cannot involve pure liquid water because ambient temperatures are too low. Here, we show that polar gullies could be initiated by fluidization of sediment over a subliming seasonal deposit of CO2 frost, as has been proposed previously. For gullies in sand, the gas speed and CO2 sublimation rate required for fluidization is calculated with the semiempirical Ergun relation (as validated in industrial applications). For gullies in dust, the gas speed and sublimation rate required for fluidization are estimated from laboratory experiments with comparable materials. To determine if those rates can be achieved, we compute diurnal and seasonal surface (and subsurface) temperatures through a Martian year (including CO2 condensation and sublimation) using the MARSTHERM onedimensional finite difference thermal model. Models were run without sediment, and with layers of sand or dust 10-4-10-1 m thick deposited over a seasonal layer of CO2 frost. The simulations show that, in the spring, sufficient heat reaches the CO2 frost, underlying the surface sediment layer, to fluidize them. This result confirms that Martian gullies may have diverse origins and that polar and mid latitude gullies can be initiated on steep slopes by the fluidization of loose sediment on a sublimating seasonal deposit of CO2 gas. JF - American Geophysical Union Fall Meeting AU - Cedillo-Flores, Y AU - Treiman, A H AU - Clifford, S M AU - Lasue, J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P21C EP - 1853 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645575522?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=CO+%28sub+2%29+gas+fluidization+possible+origin+of+Martian+polar+gullies&rft.au=Cedillo-Flores%2C+Y%3BTreiman%2C+A+H%3BClifford%2C+S+M%3BLasue%2C+J%3BAnonymous&rft.aulast=Cedillo-Flores&rft.aufirst=Y&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - JOUR T1 - Numerical modeling of two-phase flow at the Main Endeavour Field, Juan de Fuca Ridge; quasi-steady state and thermal decline of the vent field AN - 1641013187; 2015-000810 AB - The Main Endeavour Field (MEF) on the Juan de Fuca Ridge consists of a large number of chimney structures occupying an area approximately 400 mX150 m along the ridge axis. For nearly a decade, the MEF exhibited quasi-steady north-south trending spatial gradients of both temperature and salinity. We have constructed 2-D across-axis numerical models of two-phase flow using the code FISHES to investigate possible causes for this variation. We considered the effect of bottom boundary temperature and both a homogeneous permeability structure and a geometry incorporating a more-permeable layer 2A. From these model results we argue that such a trend is more likely to be the result of heterogeneous permeability structure of the shallow oceanic crust than a result of bottom boundary temperature variations. After a magmatic event in 1999, this trend was disrupted; and thermal data using the Autonomous Benthic Explorer (ABE) indicates that there has been a significant decline in the heat output from a value of approximately 450 MW in 2000 to approximately 300 MW in 2004. In the southern part of the vent field, vent salinities have also increased from values well below those of seawater to values close to seawater. We therefore extend our investigation to include the effect of a temporally-decaying basal heat flow, which may result from cooling, crystallizing magma chamber, on the system. Our aim is to determine whether such a phenomenon could cause the observed rapid decline of heat flow and changes in vent salinity at the MEF. We find that the thermal inertia in the system is such that changes in basal heat flow would be difficult to detect in the given time frame, if magma replenishment ceased following the 1999 magmatic event. The time delay between changes in bottom conditions and the observed decay in observed heat output suggests that the 1999 event represented a small replenishment event and that the AMC may have begun cooling some time before that. Moreover, because the convection system is fundamentally unsteady as a result of the high Rayleigh number, the changes in vent salinity and temperature may result from natural fluctuations in the system and may not represent secular decay of the hydrothermal system. JF - American Geophysical Union Fall Meeting AU - Singh, Sonadian AU - Lowell, R P AU - Lewis, Kayla C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract OS51B EP - 1871 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641013187?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Numerical+modeling+of+two-phase+flow+at+the+Main+Endeavour+Field%2C+Juan+de+Fuca+Ridge%3B+quasi-steady+state+and+thermal+decline+of+the+vent+field&rft.au=Singh%2C+Sonadian%3BLowell%2C+R+P%3BLewis%2C+Kayla+C%3BAnonymous&rft.aulast=Singh&rft.aufirst=Sonadian&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Unraveling complex nonlinear elastic behaviors in rocks using dynamic acousto-elasticity AN - 1641010994; 2015-002053 AB - In comparison with standard nonlinear ultrasonic methods like frequency mixing or resonance based measurements that allow one to extract average, bulk variations of modulus and attenuation versus strain level, dynamic acousto-elasticity (DAE) allows to obtain the elastic behavior over the entire dynamic cycle, detailing the full nonlinear behavior under tension and compression, including hysteresis and memory effects. This method consists of exciting a sample in Bulk-mode resonance at strains of 10-7 to 10-5 and simultaneously probing with a sequence of high frequency, low amplitude pulses. Time of flight and amplitudes of these pulses, respectively related to nonlinear elastic and dissipative parameters, can be plotted versus vibration strain level. Despite complex nonlinear signatures obtained for most rocks, it can be shown that for low strain amplitude (< 10-6), the nonlinear classical theory issued from a Taylor decomposition can explain the harmonic content. For higher strain, harmonic content becomes richer and the material exhibits more hysteretic behaviors, i.e. strain rate dependencies. Such observations have been made in the past (e.g., Pasqualini et al., JGR 2007), but not with the extreme detail of elasticity provided by DAE. Previous quasi-static measurements made in Berea sandstone (Claytor et al, GRL 2009), show that the hysteretic behavior disappears when the protocol is performed at a very low strain-rate (static limit). Therefore, future work will aim at linking quasi-static and dynamic observations, i.e. the frequency or strain-rate dependence, in order to understand underlying physical phenomena. JF - American Geophysical Union Fall Meeting AU - Riviere, J AU - Guyer, R AU - Renaud, G AU - Ten Cate, J A AU - Johnson, P A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract MR33B EP - 2454 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641010994?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Unraveling+complex+nonlinear+elastic+behaviors+in+rocks+using+dynamic+acousto-elasticity&rft.au=Riviere%2C+J%3BGuyer%2C+R%3BRenaud%2C+G%3BTen+Cate%2C+J+A%3BJohnson%2C+P+A%3BAnonymous&rft.aulast=Riviere&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - Least-squares reverse-time migration of Cranfield VSP data for monitoring CO (sub 2) injection AN - 1641010719; 2015-000770 AB - Cost-effective monitoring for carbon utilization and sequestration requires high-resolution imaging with a minimal amount of data. Least-squares reverse-time migration is a promising imaging method for this purpose. We apply least-squares reverse-time migration to a portion of the 3D vertical seismic profile data acquired at the Cranfield enhanced oil recovery field in Mississippi for monitoring CO (sub 2) injection. Conventional reverse-time migration of limited data suffers from significant image artifacts and a poor image resolution. Lease-squares reverse-time migration can reduce image artifacts and improves the image resolution. We demonstrate the significant improvements of least-squares reverse-time migration by comparing its migration images of the Cranfield VSP data with that obtained using the conventional reverse-time migration. JF - American Geophysical Union Fall Meeting AU - Tan, S AU - Huang, L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract GC51A EP - 1171 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641010719?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Least-squares+reverse-time+migration+of+Cranfield+VSP+data+for+monitoring+CO+%28sub+2%29+injection&rft.au=Tan%2C+S%3BHuang%2C+L%3BAnonymous&rft.aulast=Tan&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Time-lapse walkaway VSP imaging using reverse-time migration in the angle domain for monitoring CO (sub 2) injection at the SACROC EOR field AN - 1641010693; 2015-000769 AB - Time-lapse walkaway vertical seismic profiling (VSP) surveys can reveal important reservoir changes caused by CO (sub 2) injection. We study the capability of time-lapse walkaway VSP imaging using reverse-time migration in the angle-domain for monitoring CO (sub 2) injection. During the Phase II project of the Southwest Regional Partnership on Carbon Sequestration, one baseline and one repeat walkaway VSP surveys were conducted in 2008 and 2009, respectively, at the SACROC enhanced oil recovery (EOR) field for monitoring CO (sub 2) injection. The datasets were acquired by Baker Atlas in collaboration with Kinder Morgan. In this study, we apply reverse-time migration in the angle domain to the time-lapse walkaway VSP datasets from the SACROC EOR field, and conduct detailed analyses of common-image gathers. Our migration results demonstrate that reverse-time migration in the angle domain produces images of time-lapse walkaway VSP data with a better image quality compared to those obtained using conventional reverse-time migration. The time-lapse image difference along the bottom of the reservoir where CO (sub 2) is injected is much more significant than that along the top of the reservoir. This is partially because we use the same baseline velocity model for migrations of both datasets. The reservoir velocity decreases during CO (sub 2) injection, leading to slightly change in the migration image location along the bottom of the reservoir for the repeat VSP data. JF - American Geophysical Union Fall Meeting AU - Huang, L AU - Huang, H AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract GC51A EP - 1170 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641010693?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Time-lapse+walkaway+VSP+imaging+using+reverse-time+migration+in+the+angle+domain+for+monitoring+CO+%28sub+2%29+injection+at+the+SACROC+EOR+field&rft.au=Huang%2C+L%3BHuang%2C+H%3BAnonymous&rft.aulast=Huang&rft.aufirst=L&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Development of a broadband VIS/NIR reflectivity diagnostic for dynamic shock compression experiments AN - 1637542421; 2014-104227 AB - Broadband reflectivity measurements provide detailed information about the optical and electronic properties of shocked matter, complementing other spectroscopic techniques and increasing the accuracy of pyrometric measurements, which is vital for improving models of planetary cores. A time resolved broadband VIS/NIR reflectivity diagnostic was constructed and recently tested at the Jupiter Laser Facility at Lawrence Livermore National Lab and determined to be a viable technique for obtaining spectrally resolved reflectivity data during shock compression. A 50-100 fs 800 nm pulse was first sent through a pulse stacker and then an intense white light pulse with wavelengths from approximately 400 nm to approximately 1200 nm was generated by focusing the stacked pulses into a calcium fluoride crystal. The white light pulses were then sent into the chamber and reflected from the target surface. The reflected light was dispersed using a custom spectrometer which was coupled to a ROSS streak camera with an S1 photocathode, allowing for light collection across the entire wavelength band listed above. Reflectivity measurements were obtained for various targets during the aforementioned campaign with one ns time resolution and 0.53 nm wavelength resolution. JF - American Geophysical Union Fall Meeting AU - Ali, S J AU - Bolme, C AU - Jeanloz, R AU - Collins, G AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract MR23B EP - 2409 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637542421?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Development+of+a+broadband+VIS%2FNIR+reflectivity+diagnostic+for+dynamic+shock+compression+experiments&rft.au=Ali%2C+S+J%3BBolme%2C+C%3BJeanloz%2C+R%3BCollins%2C+G%3BAnonymous&rft.aulast=Ali&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Modeling coupled thermo-hydro-mechanical processes including plastic deformation in geological porous media AN - 1637542287; 2014-103951 AB - There has been an increasing interest in the recent years in developing computational tools for analyzing coupled thermal, hydrological and mechanical (THM) processes that occur in geological porous media. This is mainly due to their importance in applications including carbon sequestration, enhanced geothermal systems, oil and gas production from unconventional sources, degradation of Arctic permafrost, and nuclear waste isolation. Large changes in pressures, temperatures and saturation can result due to injection/withdrawal of fluids or emplaced heat sources. These can potentially lead to large changes in the fluid flow and mechanical behavior of the formation, including shear and tensile failure on pre-existing or induced fractures and the associated permeability changes. Due to this, plastic deformation and large changes in material properties such as permeability and porosity can be expected to play an important role in these processes. We describe a general purpose computational code FEHM that has been developed for the purpose of modeling coupled THM processes during multi-phase fluid flow and transport in fractured porous media. The code uses a continuum mechanics approach, based on control volume--finite element method. It is designed to address spatial scales on the order of tens of centimeters to tens of kilometers. While large deformations are important in many situations, we have adapted the small strain formulation as useful insight can be obtained in many problems of practical interest with this approach while remaining computationally manageable. Nonlinearities in the equations and the material properties are handled using a full Jacobian Newton-Raphson technique. Stress-strain relationships are assumed to follow linear elastic/plastic behavior. The code incorporates several plasticity models such as von Mises, Drucker-Prager, and also a large suite of models for coupling flow and mechanical deformation via permeability and stresses/deformations. In this work we present several example applications of such models. JF - American Geophysical Union Fall Meeting AU - Kelkar, S AU - Karra, S AU - Pawar, Rajesh J AU - Zyvoloski, G AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H51H EP - 1452 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637542287?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Modeling+coupled+thermo-hydro-mechanical+processes+including+plastic+deformation+in+geological+porous+media&rft.au=Kelkar%2C+S%3BKarra%2C+S%3BPawar%2C+Rajesh+J%3BZyvoloski%2C+G%3BAnonymous&rft.aulast=Kelkar&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Using high performance computing to model Earth's permafrost dynamics AN - 1637542248; 2014-103950 AB - The freezing and thawing of subsurface water in permafrost regions can impact the hydrological, ecological and the biogeochemical responses in the ground and their feedback to climate. Understanding the movement of the various water phases is of importance in studying the effects of climate on such responses. In this work, we present a new non-isothermal, single-component (water), three-phase formulation, which treats air as an inactive component. The new formulation is implemented in the massively parallel subsurface flow and reactive transport open source code PFLOTRAN and we shall present the details of the implementation. Validation studies using previously published experimental data are performed. Three-dimensional simulations of permafrost freezing and thawing due to seasonal variation are also presented. JF - American Geophysical Union Fall Meeting AU - Karra, S AU - Painter, S AU - Lichtner, Peter C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H51H EP - 1451 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 25:Soils UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637542248?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Using+high+performance+computing+to+model+Earth%27s+permafrost+dynamics&rft.au=Karra%2C+S%3BPainter%2C+S%3BLichtner%2C+Peter+C%3BAnonymous&rft.aulast=Karra&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Lattice-Boltzmann modeling of interfacial dynamics in porous media AN - 1637540617; 2014-103928 AB - Traditional continuum scale multiphase flow models rely heavily on average properties and constitutive relationships that do not always accurately represent the underlying physics affecting flow and transport at the pore scale. These models are typically based on heuristic extensions of Darcy's law, rather than formally upscaling conservation principles that account for the microscale physics. As a result, constitutive relationships, such as capillary pressure and relative permeability, are highly simplified. It has been recognized that continuum scale multiphase flow models must include gradients of saturation and specific fluid-fluid interfacial area, in addition to the Darcy pressure gradient, as driving forces for the flow of multiple fluids in porous media. In this work, we investigate interfacial dynamics in porous media using a multicomponent lattice-Boltzmann simulator. We present simulations of drainage and imbibition in 2D and 3D heterogeneous porous media. We validate the simulations by comparing specific interfacial area estimates with those obtained from experiments. In addition, we present estimates of continuum scale interfacial velocity and the production/destruction of specific interfacial area. JF - American Geophysical Union Fall Meeting AU - Porter, M L AU - Coon, E T AU - Kang, Q AU - Carey, J W AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H51G EP - 1428 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637540617?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Lattice-Boltzmann+modeling+of+interfacial+dynamics+in+porous+media&rft.au=Porter%2C+M+L%3BCoon%2C+E+T%3BKang%2C+Q%3BCarey%2C+J+W%3BAnonymous&rft.aulast=Porter&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Groundwater quality impacts related to carbon dioxide, brine and trace metal leakage into a shallow, unconfined limestone aquifer AN - 1637531361; 2014-101054 AB - Accurate prediction of the impact of leaks related to geologic carbon sequestration on groundwater quality is limited by the complexity of subsurface aquifers and the geochemical reactions that control drinking water compositions. As a result, there is a high uncertainty associated with predictions, hampering monitoring plans, interpretation of the monitoring results, and mitigation plans for a given site. As a part of the National Risk Assessment Program (NRAP), funded by the U.S. Department of Energy, a model of the Edwards Aquifer in Texas has been developed to examine the geochemical impacts of leakage of CO (sub 2) and brine containing trace metals into an oxidizing unconfined, carbonate aquifer. We use STOMP-CO2-R, which is a multiphase flow simulator, coupled with the reactive transport module ECKEChem, both developed at PNNL, to simulate CO (sub 2) sequestration in deep saline formations and the associated reactions with formation minerals. The limestone almost entirely consists of calcite, with lesser amounts of dolomite and trace metals adsorbed on minor amounts of clay and iron oxides. A reduced order model of this more complex chemistry and physics based model has been developed to be included in a framework for quantifying the overall risks associated with CO (sub 2) injection, leaks and groundwater impacts. The aquifer model uses reduced-order models, provided by other NRAP groups, of CO (sub 2) and brine leakage from well bores and faults as inputs. Geochemical input parameters were varied to determine parameter sensitivity and to generate a response surface of output variables. The output variables were pH 500 ppm plume size and CO (sub 2) flux to atmosphere, as well the volume of aquifer with trace metal concentrations greater than their U.S. Environmental Protection Agency Maximum Contaminant Levels. The uncertain input parameters were CO (sub 2) /brine leak rate, brine composition, mineral surface area and volumetric percent, equilibrium coefficients, and kinetic rates. Hundreds of combinations of the input parameters were generated using Latin Hypercube Sampling, and simulations performed. Once the response surface was generated, the model input parameters were ranked for relative importance using the MARS (multi-variate adaptive regression splines) method. Finally, we developed reduced order models of the geochemical impacts of CO (sub 2) and brine with trace metal leakage into an unconfined limestone aquifer. We compare the results of the reduced order models, developed by two methods: polynomial nonlinear regression and stepwise backward removal approach by minimizing Akaike Information Criterion, to those of the full chemistry- and physics-based model. JF - American Geophysical Union Fall Meeting AU - Bacon, D H AU - Hou, Z AU - Dai, Z AU - Zheng, L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H33L EP - 05 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637531361?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Groundwater+quality+impacts+related+to+carbon+dioxide%2C+brine+and+trace+metal+leakage+into+a+shallow%2C+unconfined+limestone+aquifer&rft.au=Bacon%2C+D+H%3BHou%2C+Z%3BDai%2C+Z%3BZheng%2C+L%3BAnonymous&rft.aulast=Bacon&rft.aufirst=D&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Impact of the leaked CO (sub 2) from deep reservoirs on quality of shallow groundwater AN - 1637531193; 2014-101050 AB - One of the areas of concerns for geologic CO2 sequestration is the potential leakage of CO2 and brine from deeper storage reservoirs to shallow groundwater resources. This could lead to changes in shallow groundwater chemistry degrading water quality. As part of the National Risk Assessment Partnership (NRAP) for geologic CO2 sequestration project, we perform experimental and modeling studies to understand the mechanisms of the leaked CO2 and brine flow, transport and reaction with aquifer water and minerals. We have developed a 3-dimensional heterogeneous numerical model for an unconfined shallow aquifer that is being used to simulate the CO2 leakage and the associated geochemical interactions over 200 years. A Monte-Carlo analysis is performed to estimate the probability of plume sizes of the pH less than 6.5 and TDS larger than 500 ppm in the shallow aquifer. The metrics were chosen as proxies that indicate how groundwater quality is affected by leakage. The uncertain parameters in our study include five for describing geologic heterogeneity in the permeability (permeability mean, variance, integral range, anisotropic factor and porosity), one for lateral flow rate and five for defining the CO2 leakage rate in temporal and spatial domains. A global sensitivity analysis is conducted for three outputs (the amount of CO2 leaving the top of aquifer, the plume sizes of pH below 6.5 and TDS over 500 ppm). Finally, we derive one-, two- and three-dimensional response surfaces developed based on the 2000 process modeling results of CO2 and brine reactive transport models. These response surfaces have been incorporated into the system model CO2-PENS in order to calculate risk profiles that consider uncertainty in the sequestration reservoir, leaky wellbore and the shallow groundwater aquifer. JF - American Geophysical Union Fall Meeting AU - Dai, Z AU - Keating, E H AU - Viswanathan, H S AU - Pawar, R J AU - Bacon, D H AU - Carroll, S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H33L EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637531193?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Impact+of+the+leaked+CO+%28sub+2%29+from+deep+reservoirs+on+quality+of+shallow+groundwater&rft.au=Dai%2C+Z%3BKeating%2C+E+H%3BViswanathan%2C+H+S%3BPawar%2C+R+J%3BBacon%2C+D+H%3BCarroll%2C+S%3BAnonymous&rft.aulast=Dai&rft.aufirst=Z&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Model-driven decision support for monitoring network design; methods and applications AN - 1637531159; 2014-100959 AB - A crucial aspect of any decision-making process for environmental management of contaminated sites and protection of groundwater resources is the identification of scientifically defensible remediation scenarios. The selected scenarios are ranked based on both their protective and cost effectiveness. The decision-making process is facilitated by implementation of site-specific data- and model-driven analyses for decision support (DS) taking into account existing uncertainties to evaluate alternative characterization and remedial activities. However, due to lack of data and/or complex interdependent uncertainties (conceptual elements, model parameters, measurement/computational errors, etc.), the DS optimization problem is ill posed (non unique) and the model-prediction uncertainties are difficult to quantify. Recently, we have developed and implemented several novel theoretical approaches and computational algorithms for model-driven decision support. New and existing DS tools have been employed for model analyses of the fate and extent of a chromium plume in the regional aquifer at Sandia Canyon Site, LANL. Since 2007, we have performed three iterations of DS analyses implementing different models, decision-making tools, and data sets providing guidance on design of a subsurface monitoring network for (1) characterization of the flow and transports processes, and (2) protection of the water users. The monitoring network is augmented by new wells at locations where acquired new data can effectively reduce uncertainty in model predicted contaminant concentrations. A key component of the DS analyses is contaminant source identification. Due to data and conceptual uncertainties, subsurface processes controlling the contaminant arrival at the top of the regional aquifer are not well defined. Nevertheless, the model-based analyses of the existing data and conceptual knowledge, including respective uncertainties, provide constrained probabilistic estimates of the contaminant concentrations (mass) in the regional aquifer. To explore the uncertainties in model predictions, a series of existing and novel approaches (global/local) have been tested and compared. Retrospective analyses of the published source-identification and DS results demonstrate the accuracy of model predictions and the success of implemented decision-support process. The presented new and existing DS approaches and computational algorithms are implemented in code MADS (Model Analyses for Decision Support; http://mads.lanl.gov). MADS is C/C++ code designed to be an open-source framework for model-based decision support employing system and physics simulation models. MADS performs various types of model analyses including sensitivity analysis, parameter estimation, uncertainty quantification, model calibration, selection and averaging. Currently, MADS algorithms are being also implemented in a Decision Support (DS) Toolbox of ASCEM (Advanced Subsurface Computing for Environmental Management; http://ascemdoe.org) code development project funded by the U.S. Department of Energy, Environmental Management (DOE EM). ASCEM targets development of an interactive decision support system (DSS) that will help domain scientist, managers, regulators, and stakeholders to make decisions related to site characterization, monitoring design, and remedial activities based on data- and model-driven DS analyses exploiting high-performance computing. JF - American Geophysical Union Fall Meeting AU - Vesselinov, V V AU - Harp, D R AU - Mishra, P K AU - Katzman, D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H32F EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637531159?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Model-driven+decision+support+for+monitoring+network+design%3B+methods+and+applications&rft.au=Vesselinov%2C+V+V%3BHarp%2C+D+R%3BMishra%2C+P+K%3BKatzman%2C+D%3BAnonymous&rft.aulast=Vesselinov&rft.aufirst=V&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - The effects of heterogeneity on CO (sub 2) gas phase evolution in the shallow subsurface during leakage from geologic sequestration sites; intermediate scale experiments and numerical simulations AN - 1637531118; 2014-101055 AB - A concern for geologic carbon sequestration is the potential for stored CO2 to leak upward into shallow freshwater aquifers where it can have potentially negative impacts. Understanding the mechanisms of CO2 migration and predicting its movement in shallow aquifers is a critical part of determining those potential impacts. During leakage, CO2 can move either as free-phase or as CO2 dissolved in brine. Dissolved CO2 may travel upward and/or migrate laterally through the subsurface, potentially causing the gas to come back out of solution (exsolve). Exsolved gas may become entrapped in the subsurface, and/or create flow paths that allow the gas to escape into the vadose zone and the atmosphere. The processes of gas exsolution, entrapment and flow in the shallow subsurface are controlled by various factors, including temperature, concentration of leaking CO2, pressure of the surrounding water, and heterogeneity of the subsurface environment. Unlike field studies, the laboratory setting allows for detailed observation of the relationships among these factors across multiple dimensionalities and scales. For this study, a series of one-dimensional laboratory experiments were conducted at an unprecedented spatial scale that yielded data with an unprecedented spatiotemporal resolution. Fresh water was saturated with dissolved CO2 gas under a specified pressure (the saturation pressure) before being injected at a constant volumetric flow rate into the bottom of a 4.5-meter tall column of sand that was initially saturated with fresh water. Soil moisture sensors installed along the length of the column detected the exsolution, growth, and entrapment of gas phase in the column through time by measuring the average water content in representative elementary volumes of soil. A gas flow meter and a scale continuously monitored the outflow of CO2 gas and water from the top of the column. Several packing configurations were used in order to test the effects of different types of heterogeneity on the evolution of the gas phase. Results indicate that: (1) heterogeneous interfaces trigger exsolution when they exist at a location where the water pressure is less than the saturation pressure, (2) in the short term, heterogeneity results in earlier gas exsolution, growth and flow while, in the long-term, it leads to local entrapment of gas phase (e.g., below interfaces where fine material overlays coarser material), (3) gas exsolution and growth are enhanced when the contrast between the two types of porous media is greater, and (4) in coarser material, gas phase gets distributed more uniformly whereas in finer materials, localized gas flow paths tend to form. Further research is ongoing into the dimensionality of these processes through experiments conducted in an intermediate scale two-dimensional tank. Various numerical tools are also being tested for their ability to simulate these processes. JF - American Geophysical Union Fall Meeting AU - Plampin, M R AU - Sakaki, T AU - Pawar, R J AU - Illangasekare, T H AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H33L EP - 06 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637531118?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+effects+of+heterogeneity+on+CO+%28sub+2%29+gas+phase+evolution+in+the+shallow+subsurface+during+leakage+from+geologic+sequestration+sites%3B+intermediate+scale+experiments+and+numerical+simulations&rft.au=Plampin%2C+M+R%3BSakaki%2C+T%3BPawar%2C+R+J%3BIllangasekare%2C+T+H%3BAnonymous&rft.aulast=Plampin&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Uncertainty analysis of simulated hydraulic fracturing AN - 1637526936; 2014-101034 AB - Artificial hydraulic fracturing is being used widely to stimulate production of oil, natural gas, and geothermal reservoirs with low natural permeability. Optimization of field design and operation is limited by the incomplete characterization of the reservoir, as well as the complexity of hydrological and geomechanical processes that control the fracturing. Thus, there are a variety of uncertainties associated with the pre-existing fracture distribution, rock mechanics, and hydraulic-fracture engineering that require evaluation of their impact on the optimized design. In this study, a multiple-stage scheme was employed to evaluate the uncertainty. We first define the ranges and distributions of 11 input parameters that characterize the natural fracture topology, in situ stress, geomechanical behavior of the rock matrix and joint interfaces, and pumping operation, to cover a wide spectrum of potential conditions expected for a natural reservoir. These parameters were then sampled 1,000 times in an 11-dimensional parameter space constrained by the specified ranges using the Latin-hypercube method. These 1,000 parameter sets were fed into the fracture simulators, and the outputs were used to construct three designed objective functions, i.e. fracture density, opened fracture length and area density. Using PSUADE, three response surfaces (11-dimensional) of the objective functions were developed and global sensitivity was analyzed to identify the most sensitive parameters for the objective functions representing fracture connectivity, which are critical for sweep efficiency of the recovery process. The second-stage high resolution response surfaces were constructed with dimension reduced to the number of the most sensitive parameters. An additional response surface with respect to the objective function of the fractal dimension for fracture distributions was constructed in this stage. Based on these response surfaces, comprehensive uncertainty analyses were conducted among input parameters and objective functions. In addition, reduced-order emulation models resulting from this analysis can be used for optimal control of hydraulic fracturing. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. JF - American Geophysical Union Fall Meeting AU - Chen, M AU - Sun, Y AU - Fu, P AU - Carrigan, C R AU - Lu, Z AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H33I EP - 1449 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637526936?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Uncertainty+analysis+of+simulated+hydraulic+fracturing&rft.au=Chen%2C+M%3BSun%2C+Y%3BFu%2C+P%3BCarrigan%2C+C+R%3BLu%2C+Z%3BAnonymous&rft.aulast=Chen&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Progress towards coupled simulation of surface/subsurface hydrologic processes and terrestrial ecosystem dynamics using the community models PFLOTRAN and CLM AN - 1637526862; 2014-101020 AB - Accurately simulating regional water cycle dynamics is challenging because of strong soil moisture-rainfall feedbacks and large uncertainties associated with vegetation and energy interactions. Earth system models of today cannot accurately capture such interactions, because current-generation land surface models (LSMs) 1) do not explicitly represent the fine-scale spatial variability of topography, soils, and vegetation that play a significant role in determining the response of hydrologic states (soil moisture) and fluxes (interception, infiltration, runoff, evapotranspiration) and 2) over-simplify or completely omit some key physical processes, such as lateral flow of water and heat, surface-subsurface interactions, realistic groundwater-vadose zone interactions, and freeze-thaw dynamics. Capturing such processes is critically important for predicting regional precipitation, vegetation productivity, and the disposition of carbon stored in potentially vulnerable permafrost under scenarios of climate change. Towards this end, we have added coupled surface water-groundwater interactions to the the open-source, massively parallel flow and reactive transport model PFLOTRAN, and have been developing a framework for coupling PFLOTRAN with the Community Land Model (CLM). PFLOTRAN is an open-source (LGPL-licensed) code -- with a growing community of users -- developed for simulation of multiscale, multiphase, multicomponent subsurface flow and reactive transport problems on machines ranging from laptops to leadership-class supercomputers. It has been applied in studies of contaminant fate and transport, geologic CO (sub 2) sequestration, and geothermal energy production, among others, and has been run using up to 262,144 processor cores on Jaguar, the Cray XK6 supercomputer at Oak Ridge National Laboratory. We have recently added a surface flow component in PFLOTRAN that is integrated with the subsurface. The underlying solver framework employed allows significant flexibility in how the governing equations are solved, and we will compare different surface flow formulations as well as coupling strategies between the surface and subsurface domains. Additionally, for studies of hydrology in Arctic regions, we have added a three-phase ice model. We will present some demonstrations of this capability and discuss solver strategies for handling the strong nonlinearities that arise. To provide a unified treatment of the unsaturated and saturated zones and to enable lateral redistribution of soil moisture (and eventually surface water, heat, and nutrients) in regional climate models, we have developed an approach for coupling PFLOTRAN with CLM. CLM is the global land model component used within the Community Earth System Model (CESM) to simulate an extensive set of biogeophysical and biogeochemical processes occurring at or near the terrestrial surface. We will describe our approach for replacing the existing CLM hydrology using PFLOTRAN and present some preliminary simulations undertaken with the CLM-PFLOTRAN coupled model. JF - American Geophysical Union Fall Meeting AU - Mills, R T AU - Bisht, G AU - Karra, S AU - Hoffman, F M AU - Hammond, G E AU - Kumar, J AU - Painter, S AU - Thornton, P E AU - Lichtner, P C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H33H EP - 1426 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637526862?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Progress+towards+coupled+simulation+of+surface%2Fsubsurface+hydrologic+processes+and+terrestrial+ecosystem+dynamics+using+the+community+models+PFLOTRAN+and+CLM&rft.au=Mills%2C+R+T%3BBisht%2C+G%3BKarra%2C+S%3BHoffman%2C+F+M%3BHammond%2C+G+E%3BKumar%2C+J%3BPainter%2C+S%3BThornton%2C+P+E%3BLichtner%2C+P+C%3BAnonymous&rft.aulast=Mills&rft.aufirst=R&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Uncertainty assessment at BC Cribs at hanford using the ASCEM toolset AN - 1637526685; 2014-101130 AB - Uncertainty assessments in subsurface applications typically neglect uncertainty in the conceptual model, and attribute uncertainty to errors in parameters and inputs. At the BC Cribs site at Hanford in southeastern Washington State, conceptualization of the system is highly uncertain because only sparse information is available for the geologic conceptual model and the physical and chemical properties of the sediments. In this contribution, uncertainty in the conceptual model is explored using the ASCEM (Advanced Simulation Capability for Environmental Management) toolset. The ASCEM toolset includes a high performance flow and reactive transport simulator (Amanzi), as well as a user environment called Akuna. Akuna provides a range of tools to manage environmental and simulator data sets, perform model setup, manage simulation data, and visualize results. Core toolsets beneath the user interface provide algorithms for performing sensitivity analyses, parameter estimation, and uncertainty quantification. In this contribution, the uncertainty in technetium-99 transport through a three-dimensional, heterogeneous vadose-zone system is quantified with Monte Carlo simulation. Results show that significant prediction uncertainty in simulated concentrations can be introduced by conceptual model variation. It is also shown that the ASCEM toolset represents an integrated modeling environment that facilitates model setup, parameter optimization, and uncertainty analyses through high-performance computing. JF - American Geophysical Union Fall Meeting AU - Freedman, Vicky L AU - Rockhold, Mark L AU - Chen, Xingyuan AU - Schuchardt, Karen AU - Pau, G AU - Vesselinov, V V AU - Porter, Ellen AU - Waichler, Scott AU - Freshley, Mark AU - Gorton, Ian AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H43D EP - 1367 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637526685?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Uncertainty+assessment+at+BC+Cribs+at+hanford+using+the+ASCEM+toolset&rft.au=Freedman%2C+Vicky+L%3BRockhold%2C+Mark+L%3BChen%2C+Xingyuan%3BSchuchardt%2C+Karen%3BPau%2C+G%3BVesselinov%2C+V+V%3BPorter%2C+Ellen%3BWaichler%2C+Scott%3BFreshley%2C+Mark%3BGorton%2C+Ian%3BAnonymous&rft.aulast=Freedman&rft.aufirst=Vicky&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/H/sessions/H43D/abstracts/H43D-1367.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Greenland runoff distribution and trends 1960-2010, simulated using hydroflow AN - 1629946082; 2014-095445 AB - Ample evidence indicates the Greenland climate and hydrological cycle is changing. Fluctuations in mass balance and freshwater runoff from the Greenland Ice Sheet (GrIS) and Greenland follow climate fluctuations. Runoff magnitudes, the spatial patterns from individual Greenland catchments, and their changes through time (1960-2010) were simulated using HydroFlow (a runoff routing model), in an effort to understand runoff variations to adjacent seas. Significant increases in air temperature, net precipitation, and local surface runoff lead to enhanced and statistically significant GrIS surface mass balance (SMB) loss. Total Greenland runoff to the surrounding oceans increased 30%, averaging 481+ or -85 km (super 3) yr (super -1) . Averaged over the period, approximately two thirds of the runoff to the surrounding seas originated from the GrIS and one third came from outside the GrIS from rain and melting glaciers and ice caps. The runoff increase from the GrIS was due to an 87% increase in melt extent, 18% from increases in melt duration, and a 5% decrease in melt rates (87% + 18% - 5% = 100%). In contrast, the runoff increase from the land area surrounding the GrIS was due to a 0% change in melt extent, a 108% increase in melt duration, and an 8% decrease in melt rate. Regionally, runoff was greater from western than eastern Greenland. Since 1960, the data showed pronounced runoff increases in west Greenland, with the greatest increase occurring in the southwest and the lowest increase in the northwest. JF - American Geophysical Union Fall Meeting AU - Mernild, S H AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C43C EP - 0615 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629946082?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Greenland+runoff+distribution+and+trends+1960-2010%2C+simulated+using+hydroflow&rft.au=Mernild%2C+S+H%3BAnonymous&rft.aulast=Mernild&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - A mid-Pleistocene record of monsoonal precipitation in Southwestern US, insights into the occurrence of drought AN - 1629945803; 2014-095622 AB - Accurate model predictions of drought require an understanding of human-induced as well as natural climate variability. Paleoclimate records of precipitation changes over glacial/interglacial periods are essential to gain insights into natural variability. However there is a lack of such records for the southwestern US, particularly of quantitative changes. Here we present a mid-Pleistocene record of changes in monsoonal precipitation in northern New Mexico spanning interglacials MIS 13 and 11, glacial MIS 12 and onset of MIS 10. We based our estimates on the reconstructed delta D record of precipitation in lacustrine sediments from the Valles Caldera, New Mexico. The delta D record of precipitation holds similarities to the global benthic delta 18O record and the delta D record from the Antarctica Dome C ice core during glacial periods and at the glacial-interglacial boundaries. However marked differences to the global records during each of interglacials MIS 13 and 11 suggests the influence of a regional climate forcing on precipitation changes in the region. We show that monsoonal precipitation (as the proportion of annual precipitation) declined repeatedly during these interglacials from a maximum of up to 90% to less than 30%, resembling glacial periods. The variability in monsoonal precipitation during interglacial periods resembles a response to insolation cycles and its intensity correlates to the land-sea surface temperature contrast (LSTC). However, near the highest temperatures over land, there seems to be a failure of the LSTC mechanism leading to severe aridity. Our results suggest that current human-induced warming may worsen a natural state of monsoon minima leading to severe drought and this superimposed variability should be considered in climate predictions. JF - American Geophysical Union Fall Meeting AU - Cisneros Dozal, L AU - Huang, Y AU - Heikoop, J M AU - Fawcett, P J AU - Fessenden, J E AU - Anderson, R S AU - Meyers, P A AU - Larson, T E AU - Perkins, G AU - Toney, J L AU - Werne, J P AU - Goff, F AU - Wolde Gabriel, G W AU - Allen, C D AU - Berke, M A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract GC53A EP - 1252 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629945803?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+mid-Pleistocene+record+of+monsoonal+precipitation+in+Southwestern+US%2C+insights+into+the+occurrence+of+drought&rft.au=Cisneros+Dozal%2C+L%3BHuang%2C+Y%3BHeikoop%2C+J+M%3BFawcett%2C+P+J%3BFessenden%2C+J+E%3BAnderson%2C+R+S%3BMeyers%2C+P+A%3BLarson%2C+T+E%3BPerkins%2C+G%3BToney%2C+J+L%3BWerne%2C+J+P%3BGoff%2C+F%3BWolde+Gabriel%2C+G+W%3BAllen%2C+C+D%3BBerke%2C+M+A%3BAnonymous&rft.aulast=Cisneros+Dozal&rft.aufirst=L&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Transition element abundances in MORB basalts AN - 1629945353; 2014-095535 AB - The mineralogy of the mantle sources of basalts is an important, but hard to constrain parameter, especially with the basalts as chemical probes of major element mantle composition. Geophysical models imply that the deep mantle may have significant variations in Fe and Si relative to the ambient mantle sampled by MORB. Some petrological models of sub-ridge melting involve both pyroxenite and peridotite, implying that basalts preferentially sample a pyroxenite endmember. The First-Row Transition Elements (FRTE), Ga and Ge are compatible to moderately incompatible during partial melting, and are sensitive to mineralogical variability in the mantle and thus can provide constraints on mantle source mineralogy for MORB. We have analyzed major elements, FRTE, Ga and Ge on 231 basaltic glasses from the Middle Atlantic Ridge (MAR between -23 degrees S to 36.44 degrees N), 30 Mid-Cayman Rise basaltic glasses, 12 glasses from the Siqueiros Fracture Zone (EPR), 9 glasses from the Blanco Trough, Juan de Fuca ridge, and Galapagos Spreading Centers (EPR), and 4 Indian Ocean MORB. Large spots (150 mu m) were precisely (+ or -1%) analyzed by a New Wave UP193FX excimer (193 nm) laser ablation system coupled to a high-resolution ICP-MS at the National High Magnetic Field Laboratory using a high ablation rate (50 Hz) to yield blank contributions <1% for all elements, particularly Ge. The data demonstrate that the Ge/Si (6.96 x 10E-6 + or - 3%, 1sigma ) and Fe/Mn (55 + or - 2%) ratios for MORB are insensitive to fractional crystallization within the MgO range 6%-10%. MORB have Zn/Fe (9.9 x 10E-4 + or - 7%), Ga/Sc (0.37-0.50), Ga/Al (2.2 x 10E-4 + or - 11%) ratios, with the variations mostly due to the effects of fractional crystallization. Recent experimental determination of FRTE, Ga and Ge partition coefficients provide a framework within which to interpret these data [1]. Using these new partition coefficients, we have modeled the sensitivity of each element to mineralogical variations in the mantle source. Olivine primarily controls the partitioning of Fe, Zn, Ga and Ge; garnet dominates the Sc abundance; spinel exerts exceptionally strong control over Ga and Zn, and cannot be neglected as a source mineral for these elements. MORB FRTE, Ga and Ge abundances are consistent with partial melting of a spinel peridotite source (<1% garnet) similar to that estimated for DMM, although the abundances of many of these elements need to be better constrained in the model sources. [1] Davis et al. GCA (submitted) JF - American Geophysical Union Fall Meeting AU - Yang, S AU - Humayun, M AU - Salters, V J AU - Fields, D AU - Jefferson, G AU - Perfit, M R AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract DI51A EP - 2348 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629945353?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Transition+element+abundances+in+MORB+basalts&rft.au=Yang%2C+S%3BHumayun%2C+M%3BSalters%2C+V+J%3BFields%2C+D%3BJefferson%2C+G%3BPerfit%2C+M+R%3BAnonymous&rft.aulast=Yang&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Hyporheic exchange flows and biogeochemical patterns near a meandering stream; east fork of the Jemez River, Valles Caldera National Preserve, New Mexico AN - 1629942716; 2014-093269 AB - A study by the 2012 Hydrogeology Field Methods class of the University of Texas at Austin implemented multiple approaches to evaluate and characterize local hyporheic zone flow and biogeochemical trends in a highly meandering reach of the of the East Fork of the Jemez River, a fourth order stream in northwestern New Mexico. This section of the Jemez River is strongly meandering and exhibits distinct riffle-pool morphology. The high stream sinuosity creates inter-meander hyporheic flow that is also largely influenced by local groundwater gradients. In this study, dozens of piezometers were used to map the water table and flow vectors were then calculated. Surface water and ground water samples were collected and preserved for later geochemical analysis by ICPMS and HPLC, and unstable parameters and alkalinity were measured on-site. Additionally, information was collected from thermal monitoring of the streambed, stream gauging, and from a series of electrical resistivity surveys forming a network across the site. Hyporheic flow paths are suggested by alternating gaining and losing sections of the stream as determined by stream gauging at multiple locations along the reach. Water table maps and calculated fluxes across the sediment-water interface also indicate hyporheic flow paths. We find variability in the distribution of biogeochemical constituents (oxidation-reduction potential, nitrate, ammonium, and phosphate) along interpreted flow paths which is partly consistent with hyporheic exchange. The variability and heterogeneity of reducing and oxidizing conditions is interpreted to be a result of groundwater-surface water interaction. Two-dimensional mapping of biogeochemical parameters show redox transitions along interpreted flow paths. Further analysis of various measured unstable chemical parameters results in observable trends strongly delineated along these preferential flow paths that are consistent with the direction of groundwater flow and the assumed direction of inter-meander hyporheic flow. JF - American Geophysical Union Fall Meeting AU - Christensen, H AU - Wooten, Julianne P AU - Swanson, E AU - Senison, Jeff J AU - Myers, K D AU - Befus, Kevin M AU - Warden, John AU - Zamora, P B AU - Gomez, J D AU - Wilson, J L AU - Groffman, A AU - Rearick, M S AU - Cardenas, M B AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H11D EP - 1223 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629942716?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Hyporheic+exchange+flows+and+biogeochemical+patterns+near+a+meandering+stream%3B+east+fork+of+the+Jemez+River%2C+Valles+Caldera+National+Preserve%2C+New+Mexico&rft.au=Christensen%2C+H%3BWooten%2C+Julianne+P%3BSwanson%2C+E%3BSenison%2C+Jeff+J%3BMyers%2C+K+D%3BBefus%2C+Kevin+M%3BWarden%2C+John%3BZamora%2C+P+B%3BGomez%2C+J+D%3BWilson%2C+J+L%3BGroffman%2C+A%3BRearick%2C+M+S%3BCardenas%2C+M+B%3BAnonymous&rft.aulast=Christensen&rft.aufirst=H&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/H/sessions/H11D/abstracts/H11D-1223.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Is hazardous waste injection into basal aquifers a good idea? AN - 1629942695; 2014-093239 AB - The recent induced M3.8-M5.5 seismic events across the midcontinent, USA have raised concern regarding regulations for hazardous waste injection. It is also important to note that in the midcontinent region, the Illinois Basin is the main target for storing CO (sub 2) up to 1 million metric tons over a 3-year period in the CCS project of DOE. Here we present a hydrogeologic-geomechanical sensitivity study using a hybrid analytic-numerical cross-sectional model to assess a wide variety of possible failure scenarios within crystalline rocks. The hydrostratigraphic framework model we used in this study is based on the geology of the Illinois Basin. The model includes 2.8 km thick Paleozoic sedimentary aquifers and confining units underlain by 4 km of bedrock. We represented injection at 1000 gallons per minute (3785 liters per minute) into a basal sandstone aquifer (Mt. Simon Sandstone) as well as the overlying carbonate and siliciclastic reservoirs (middle aquifer: Knox Dolomite, St. Peter Sandstone, upper Ordovician Carbonates). In some scenarios, we included high/low permeability vertical and sub-horizontal thrust faults. Deviatoric pore pressures from the model were used to estimate failure along critically stressed faults within the bedrock. For a basement permeability between 10 (super -15) m (super 2) to 10 (super -16) m (super 2) , injection into the basal aquifer (Mt. Simon sandstone) resulted in a failure envelop within the crystalline basement to depths of about 1.4-4 km and extending laterally up to 6 km. Including a transmissive vertical normal fault increased the depth of the failure envelope to 4 km below the base of the sedimentary pile. If a 10 (super 8) order of magnitude permeability contrast exists between the thrust fault (10 (super -10) m (super 2) ) and basement rocks (10 (super -18) m (super 2) ), then pore pressures can propagate along a sub-horizontal fault about 12 km from the injection well. For middle aquifer injection, the presence of a bottom seal (Eau Claire Formation) has a prophylactic effect, preventing downward propagation of deviatoric pressures into the basement as shown in the simulation results in Figure 1. JF - American Geophysical Union Fall Meeting AU - Zhang, Yipeng AU - Person, M A AU - Rupp, J AU - Celia, M A AU - Gable, C W AU - Bowen, Brenda B AU - Mozley, P S AU - Evans, James P AU - Dewers, T A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H11C EP - 1192 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629942695?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Is+hazardous+waste+injection+into+basal+aquifers+a+good+idea%3F&rft.au=Zhang%2C+Yipeng%3BPerson%2C+M+A%3BRupp%2C+J%3BCelia%2C+M+A%3BGable%2C+C+W%3BBowen%2C+Brenda+B%3BMozley%2C+P+S%3BEvans%2C+James+P%3BDewers%2C+T+A%3BAnonymous&rft.aulast=Zhang&rft.aufirst=Yipeng&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/H/sessions/H11C/abstracts/H11C-1192.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Topographic signature of climate change; insights into climatic controls on landscape evolution under permafrost and non-permafrost environments AN - 1629941975; 2014-098070 AB - Climate gradient across the deglaciated North American continental landscape has been a major control on the trajectory of landscape evolution following the Last Glacial Maximum (LGM) ( approximately 19-25 ka BP). Following deglaciation, landscapes in the Arctic and subarctic regions have been subject to climatic conditions favoring the development and/or preservation of permafrost. In more southerly latitudes, warmer conditions have favored non-permafrost conditions. A comparison of formerly glaciated landscapes in both permafrost and non-permafrost settings offers a unique natural experiment to explore the influence of climate on landscape evolution. Additionally, by comparing formerly glaciated terrains under both permafrost and non-permafrost conditions to landscapes never having undergone glaciation it may be possible to identify unique signatures of glaciation on hillslope morphology and processes. After glaciers retreated, newly exposed landscapes were exposed to both fluvial and hillslope mass wasting processes, the relative balance and influence of these processes on landscape evolution varied depending on Holocene climatic conditions (permafrost versus non-permaforst environments). Using analysis of high resolution Digital Elevation Model (DEM approximately 1m) data we show that the topographic denudation on these landscapes over the past Holocene has imprinted a unique climatic signature. Major differences are observed in landscape regimes and regime transitions. These differences are quantified mainly by introducing a new index, Normalized Directed Distance for Relief (NDDR), that treats the landscape relief differences and successfully identify the climate induced landscape responses. Previously glaciated permafrost landscapes are primarily characterized by narrow divergent hilltops (NDDR 0.9), California is used a representative temperate non-glaciated basin. Our results suggest, that in landscapes on the north side of the Laurentide ice sheet where permafrost has been present since deglaciation, periglacial landsurface processes such as freeze-thaw driven solifluction process and geomorphic disturbances like active layer detachment etc., limited the development of channel networks and helped to preserve signatures of glaciation on hillslopes. In contrast, in more southerly latitudes, where permafrost is absent fluvial networks have more fully developed but the hillslopes appear to retain some signature of prior glaciation. Finally, now we can test different hypotheses on many possible future trajectories of landscape evolutions under different climate change scenarios. JF - American Geophysical Union Fall Meeting AU - Gangodagamage, C AU - Rowland, J C AU - Wilson, C J AU - Brumby, S AU - Prancevic, J P AU - Crosby, B T AU - Marsh, P AU - Altmann, G AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract EP41C EP - 0817 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629941975?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Topographic+signature+of+climate+change%3B+insights+into+climatic+controls+on+landscape+evolution+under+permafrost+and+non-permafrost+environments&rft.au=Gangodagamage%2C+C%3BRowland%2C+J+C%3BWilson%2C+C+J%3BBrumby%2C+S%3BPrancevic%2C+J+P%3BCrosby%2C+B+T%3BMarsh%2C+P%3BAltmann%2C+G%3BAnonymous&rft.aulast=Gangodagamage&rft.aufirst=C&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Experimental studies of gravitational stability and CO (sub 2) dissolution AN - 1629941439; 2014-098137 AB - The injection of CO (sub 2) into a deep saline aquifer for long-term storage will initially result in a buoyant body of supercritical (sc) CO (sub 2) trapped beneath the cap-rock seal. During this period, there is risk of CO (sub 2) migration out of the reservoir along defects such as wellbores or fracture zones with potential risk to shallow groundwater resources and the atmosphere. Dissolution of the scCO (sub 2) plume into brine results in ionic trapping and greatly reduces this risk. However, based on diffusion alone, the ionic trapping of large quantities of CO (sub 2) could is expected to take thousands of years. Density-driven mixing of CO (sub 2) -saturated brine is postulated to greatly accelerate the mass transfer process. This has been the subject of many computational studies but very few experimental studies. Here we present experiments of both an analog system (water-propylene glycol) and the high-pressure, scCO (sub 2) -water system. The water-propylene glycol system shows the same type of increased mixture density as the scCO (sub 2) -water system. By scaling of the experimental parameters, the analog system was used to conduct similitude-correct investigations in a 2D Hele-Shaw cell and in a 3D cylindrical cell filled with glass beads. The analog system allows direct visualization of the system. The experiments show a clear initiation period, during which diffusion dominates, followed by the onset of convection, and also reflect the point at which the convective fingers reach the bottom of the cell. The scCO (sub 2) -water system was studied using a modified autoclave filled with 500 mu m glass beads. Experiments were conducted at 40, 75 and 90 degrees C with the vessel vertically oriented and partially filled with water. Combinations of temperature and water column height were used to simulate porous medias with Rayleigh numbers from 5,240-16,160, similar to many target CO (sub 2) sequestration reservoirs. High pressure liquid CO (sub 2) was injected rapidly at the top of the vessel until the desired pressure (200 bars) was reached. This process simulates placement of a CO (sub 2) plume at the top of the aquifer. As CO (sub 2) dissolved into the water, the system volume decreased, and, to maintain constant pressure, water was injected at the bottom, providing a quantitative measure of CO (sub 2) dissolution. Results are similar to the analog experiments with an initial period of rapid dissolution (diffusion plus organization of convective fingers), followed by a period of constant flux (convection) that transitioned to a longer period of slowing dissolution until saturation was reached (convection slowing as fingers reached the base of the vessel). During convection the mass transfer of CO (sub 2) was 20-70 times faster than diffusion alone and varied as a function of Rayleigh number. By the end of the convective period, the water reached 50-65% of CO (sub 2) saturation. JF - American Geophysical Union Fall Meeting AU - Newell, D L AU - Carey, J W AU - Backhaus, S AU - Klein, B AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H14D EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629941439?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Experimental+studies+of+gravitational+stability+and+CO+%28sub+2%29+dissolution&rft.au=Newell%2C+D+L%3BCarey%2C+J+W%3BBackhaus%2C+S%3BKlein%2C+B%3BAnonymous&rft.aulast=Newell&rft.aufirst=D&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/H/sessions/H14D/abstracts/H14D-02.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Impacts of surface mass balance uncertainties on ice sheet initialization and predictions of sea level rise AN - 1629940945; 2014-098038 AB - The initialization of an ice sheet model can involve significant uncertainties that affect projections of sea level rise. Errors in the specification of boundary conditions (bed topography, geothermal fluxes, and surface mass balance) as well as flow physics parameters and parameterizations of bed properties will be amplified and partly compensate each other under the requirement that the model ice sheet resembles the modern ice sheet. Here we quantify uncertainties associated with imperfect knowledge of the pre-industrial surface mass balance using the Community Ice Sheet Model (CISM; Rutt et al. 2009). CISM is a shallow-ice model coupled to global climate within the Community Earth System Model (CESM). It is the only coupled ice sheet-climate model that uses an energy surface mass balance instead of a positive degree day (PDD) scheme. We explore how large uncertainties in surface mass balance must be before they affect future projections of sea level rise and how the calculation of surface mass balance may be adjusted to reduce these uncertainties. JF - American Geophysical Union Fall Meeting AU - Gutowski, G AU - Jackson, C S AU - Fyke, J G AU - Lipscomb, W H AU - Sacks, W J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C53B EP - 0849 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629940945?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Impacts+of+surface+mass+balance+uncertainties+on+ice+sheet+initialization+and+predictions+of+sea+level+rise&rft.au=Gutowski%2C+G%3BJackson%2C+C+S%3BFyke%2C+J+G%3BLipscomb%2C+W+H%3BSacks%2C+W+J%3BAnonymous&rft.aulast=Gutowski&rft.aufirst=G&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Geochemical simulations on CO (sub 2) -fluid-rock interactions in EGS reservoirs AN - 1629940411; 2014-095843 AB - Supercritical CO2 has been suggested as a heat transmission fluid in Enhanced Geothermal Systems (EGS) reservoirs to improve energy extraction. Understanding the geochemical processes of CO2-fluid-rock interactions in EGS reservoirs is significant important to investigate the performance of energy extraction with CO2 instead of water as a working fluid, carbon sequestration and risk assessment. The objectives of this study: (1) to calibrate and evaluate the kinetic rate constants and specific reactive surface areas of minerals based on the batch experimental data conducted by other researchers (collaborators Kaszuba and Lo Re at the University of Wyoming); (2) to investigate the effects of CO2-fluid-rock geochemical interactions on the energy extraction efficiency, carbon sequestration, and risk assessment. A series of laboratory experiments were conducted (Lo Re et al., 2012) to investigate the geochemical reactions among water, fractured granite rocks, and injected supercritical CO2 at elevated temperatures of 250 degrees C, and pressures of 250-450 bars. The batch simulations were firstly conducted to mimic the laboratory experiments with the calibration of mineral reactive surface areas using TOUGHREACT model and parameter estimation software (PEST). Then, we performed 2-D geochemical modeling to simulate the chemical interactions among CO2, fluids, and rocks at high temperatures and pressures of EGS reservoirs. We further investigated the effects of fluid-rock interactions on the energy extraction, carbon sequestration, and risk assessment with CO2 as a heat transmission fluid instead of water for EGS reservoirs. Results of carbonate mineral precipitations suggested that the CO2 as a working fluid instead of water was favorable for EGS reservoirs on the CO2 sequestration. Our simulations also suggested that the energy extraction could be enhanced using CO2 as the transmission fluid compared to water. JF - American Geophysical Union Fall Meeting AU - Pan, F AU - McPherson, B J AU - Lichtner, P C AU - Kaszuba, John P AU - Lo Re, C AU - Karra, S AU - Lu, Chuan AU - Xu, Tianfu AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H13G EP - 1433 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629940411?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Geochemical+simulations+on+CO+%28sub+2%29+-fluid-rock+interactions+in+EGS+reservoirs&rft.au=Pan%2C+F%3BMcPherson%2C+B+J%3BLichtner%2C+P+C%3BKaszuba%2C+John+P%3BLo+Re%2C+C%3BKarra%2C+S%3BLu%2C+Chuan%3BXu%2C+Tianfu%3BAnonymous&rft.aulast=Pan&rft.aufirst=F&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/H/sessions/H13G/abstracts/H13G-1433.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Impact of IFT and viscosity on morphology of nonwetting phase, and application to geologic CO (sub 2) sequestration AN - 1629939547; 2014-098188 AB - Geologic CO2 sequestration has been suggested as a mitigation strategy with regards to energy production via coal power plants, and short term security of storage of CO2 in the subsurface is essential to a successful sequestration scheme. Entrapment of CO2 via capillary forces ("capillary trapping") occurs on short time scales, and is known to be more secure than trapping of a continuous CO2 plume via a caprock ("hydrodynamic trapping"). Manipulation of pressure-temperature-salinity conditions of the CO2 injection will alter fluid properties of the CO2-brine system, and will alter the total saturation and morphology of the capillary trapped NW phase. This work investigates the changes in morphology and connectivity of trapped non-wetting phase as a function of IFT and mobility ratio of proxy fluid pairs. Drainage-imbibition experiments of fluids of varying IFT and viscosity were performed in Bentheimer sandstone cores, and NW phase saturation was characterized using X-ray microtomography (X-ray CMT). Preliminary results indicate that while mobility ratio has little effect on NW phase morphology, IFT is positively correlated to NW phase blob volume and inversely correlated to blob number. These results suggest that a CO2 injection can be manipulated in order to encourage the formation of residual NW phase blobs with certain size/connectivity characteristics, which may be favorable with respect to other subsurface reactions (e.g. dissolution). JF - American Geophysical Union Fall Meeting AU - Herring, A L AU - Wildenschild, Dorthe AU - Andersson, Linnea AU - Sheppard, A AU - Carey, W P AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H21K EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629939547?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Impact+of+IFT+and+viscosity+on+morphology+of+nonwetting+phase%2C+and+application+to+geologic+CO+%28sub+2%29+sequestration&rft.au=Herring%2C+A+L%3BWildenschild%2C+Dorthe%3BAndersson%2C+Linnea%3BSheppard%2C+A%3BCarey%2C+W+P%3BAnonymous&rft.aulast=Herring&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/H/sessions/H21K/abstracts/H21K-03.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Inverse modeling of experiments to support more realistic simulations of sorbing radionuclide transport AN - 1629938826; 2014-095944 AB - A series of adsorption, desorption, and column transport experiments were conducted to evaluate the transport of uranium (U) and neptunium (Np) through saturated volcanic tuffs. For potential high-level radioactive waste sites, these experiments demonstrate that slow radionuclide desorption processes, which are typically not accounted for in transport models implementing simple partition coefficients (Kd values), may dominate field-scale transport. A complimentary interpretive numerical model couples a simplified geochemical description of the system with transport calculations where heterogeneities are represented as an ensemble of sorption sites with characteristic adsorption and desorption rate constants that have widely varying values. Adsorption and desorption rate constants were estimated through inverse modeling such that reliable upscaled predictions of reactive transport in field settings could be simulated. The inverse modeling software, PEST, was also used to perform advanced uncertainty quantification. The multicomponent model/parameters matching the combined data sets suggest that over much longer time and distance scales the transport of U and Np under the experimental conditions would result in very little transport over field scales because even a small number of strong sorption sites will have an exaggerated retarding influence on the transport of a radionuclide plume. Modeling of combined sorption/desorption experiments and column transport experiments that involve both the measurement of column effluent breakthrough curves and the distribution of radionuclides remaining in the column at the conclusion of the experiments holds significant promise for supporting an improved approach to properly account for mineralogical heterogeneity over long time and distance scales in reactive radionuclide transport models. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. JF - American Geophysical Union Fall Meeting AU - Arnold, B W AU - James, S C AU - Reimus, P W AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H23E EP - 1431 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629938826?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Inverse+modeling+of+experiments+to+support+more+realistic+simulations+of+sorbing+radionuclide+transport&rft.au=Arnold%2C+B+W%3BJames%2C+S+C%3BReimus%2C+P+W%3BAnonymous&rft.aulast=Arnold&rft.aufirst=B&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Seasonal subglacial hydrological evolution of a Greenland tidewater glacier AN - 1623265329; 2014-090374 AB - The contribution to sea level rise from melting ice sheets has doubled in the last decade. The rapid acceleration of Greenland's outlet glaciers has been one of the dominant factors in this contribution. Also in this last decade, Greenland has experienced an increase in average summer atmospheric temperature and associated increases in summer surface melt duration and extent. These increases in surface melt have been strongly linked with increased glacier sliding at the base through changes in the sublgacial hydrological system. Previous research has looked at conduit evolution of land-terminating and alpine glaciers, but marine-terminating glaciers, although more sensitive to environmental change, have not been thoroughly studied. The goal of this project is to investigate the timing between rapid supra-glacial lake drainages (delivering a pulse of water to the base) and the appearance of a meltwater sediment plume at the terminus. We constructed a high-temporal resolution (sub-daily) time series of lake evolution, drainage and sediment plume appearance at Rink Isbrae (west Greenland) using MODIS satellite imagery from 2000-2012. We compare the time of year and the rate of travel of the pulse to establish a better understanding of seasonal conduit development for tidewater outlet glaciers. Additionally, in comparing these variables between years, we plan to examine how the subglacial system changes when melt season duration and intensity increase. With a clearer understanding of the mechanisms controlling fluctuations in ice flow, specifically those acting in the subglacial environment, scientists can more accurately predict the future of the Greenland Ice Sheet and its effect on global sea level rise. JF - American Geophysical Union Fall Meeting AU - Schild, K M AU - Hawley, R L AU - Morriss, B F AU - Hoffman, M J AU - Catania, G A AU - Neumann, T AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C23C EP - 0671 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623265329?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Seasonal+subglacial+hydrological+evolution+of+a+Greenland+tidewater+glacier&rft.au=Schild%2C+K+M%3BHawley%2C+R+L%3BMorriss%2C+B+F%3BHoffman%2C+M+J%3BCatania%2C+G+A%3BNeumann%2C+T%3BAnonymous&rft.aulast=Schild&rft.aufirst=K&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Development of capability for microtopography-resolving simulations of hydrologic processes in permafrost affected regions AN - 1623264725; 2014-090327 AB - The frozen soils of the Arctic and subarctic regions contain vast amounts of stored organic carbon. This carbon is vulnerable to release to the atmosphere as temperatures warm and permafrost degrades. Understanding the response of the subsurface and surface hydrologic system to degrading permafrost is key to understanding the rate, timing, and chemical form of potential carbon releases to the atmosphere. Simulating the hydrologic system in degrading permafrost regions is challenging because of the potential for topographic evolution and associated drainage network reorganization as permafrost thaws and massive ground ice melts. The critical process models required for simulating hydrology include subsurface thermal hydrology of freezing/thawing soils, thermal processes within ice wedges, mechanical deformation processes, overland flow, and surface energy balances including snow dynamics. A new simulation tool, the Arctic Terrestrial Simulator (ATS), is being developed to simulate these coupled processes. The computational infrastructure must accommodate fully unstructured grids that track evolving topography, allow accurate solutions on distorted grids, provide robust and efficient solutions on highly parallel computer architectures, and enable flexibility in the strategies for coupling among the various processes. The ATS is based on Amanzi (Moulton et al. 2012), an object-oriented multi-process simulator written in C++ that provides much of the necessary computational infrastructure. Status and plans for the ATS including major hydrologic process models and validation strategies will be presented. Highly parallel simulations of overland flow using high-resolution digital elevation maps of polygonal patterned ground landscapes demonstrate the feasibility of the approach. Simulations coupling three-phase subsurface thermal hydrology with a simple thaw-induced subsidence model illustrate the strong feedbacks among the processes. JF - American Geophysical Union Fall Meeting AU - Painter, S AU - Moulton, J D AU - Berndt, M AU - Coon, E AU - Garimella, R AU - Lewis, K C AU - Manzini, G AU - Mishra, P AU - Travis, B J AU - Wilson, C J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C21D EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623264725?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Development+of+capability+for+microtopography-resolving+simulations+of+hydrologic+processes+in+permafrost+affected+regions&rft.au=Painter%2C+S%3BMoulton%2C+J+D%3BBerndt%2C+M%3BCoon%2C+E%3BGarimella%2C+R%3BLewis%2C+K+C%3BManzini%2C+G%3BMishra%2C+P%3BTravis%2C+B+J%3BWilson%2C+C+J%3BAnonymous&rft.aulast=Painter&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Assessment of moulin head variations and subglacial conduit connectivity in the Greenland ablation zone AN - 1623264314; 2014-090373 AB - One of the remaining challenges in predicting future ice sheet mass balance is to understand how ice sheet velocities respond to increasing meltwater supply in a system with dynamic subglacial channels. Moulins represent a potentially important component of this system because they convey large amounts of surface melt into the ice sheet, potentially in locations with subglacial conduits, yet it is poorly understood how this input influences spatiotemporal variations in subglacial water pressure and ice sheet velocity. To help elucidate these links at the catchment scale ( approximately 5 km2), we deployed pressure sensors into four moulins in the ablation zone of western Greenland during the summer of 2012. To monitor changes in inputs into the moulins, stream gauges were also installed at each site. In addition, a GPS array was installed to monitor spatial variations in velocity and elevation. All four moulins display strong ( approximately 50-100 m) diurnal variations in hydraulic head that are well correlated to temperature and solar radiation. Further, the moulins comprise two pairs in which the moulins in each pair experience nearly identical and concurrent head fluctuations, despite having differing water inputs. This finding suggests that separate moulins may be connected englacially or subglacially over distances as large as 1.5 km or more. JF - American Geophysical Union Fall Meeting AU - Nowinski, J D AU - Catania, G A AU - Andrews, L C AU - Gulley, J D AU - MacGregor, J A AU - Hawley, R L AU - Hoffman, M J AU - Luethi, M P AU - Neumann, T AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C23C EP - 0670 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623264314?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Assessment+of+moulin+head+variations+and+subglacial+conduit+connectivity+in+the+Greenland+ablation+zone&rft.au=Nowinski%2C+J+D%3BCatania%2C+G+A%3BAndrews%2C+L+C%3BGulley%2C+J+D%3BMacGregor%2C+J+A%3BHawley%2C+R+L%3BHoffman%2C+M+J%3BLuethi%2C+M+P%3BNeumann%2C+T%3BAnonymous&rft.aulast=Nowinski&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Glacier sliding feedbacks in a coupled subglacial hydrology and ice dynamics model AN - 1623264093; 2014-087872 AB - On the Antarctic and Greenland ice sheets, the majority of the ice mass flux to the oceans is through outlet glaciers and ice streams, the fast speeds of which are controlled by basal sliding. The quantity and distribution of water beneath ice sheets and glaciers controls basal sliding, but the interactions between the ice and water systems is not well understood when there is two-way coupling between the systems. Here, we use coupled subglacial hydrology and ice dynamics models to investigate feedbacks between the ice and water systems. Our subglacial hydrology model describes a 2-D macroporous sheet (composed of linked cavities or patchy water films) by accounting for conservation of water mass and evolution of cavity space within the sheet. Using a Coulomb friction sliding law, the hydrology model is coupled to the Community Ice Sheet Model, which solves a 3-D higher-order approximation of the ice momentum balance. Notably, our model does not include the switch from distributed to channelized drainage (which lowers water pressure and sliding by drawing water to main subglacial arteries), but relies solely on a distributed macroporous sheet. We use the coupled models as a diagnostic, experimental tool to investigate interactions between the ice and water systems that can either diminish or enhance glacier sliding. Importantly, we identify two negative feedbacks that decrease sliding in the coupled system: 1. Sliding over bedrock bumps opens additional cavity space which lowers water pressure and, in turn, sliding. 2. Basal melt (which increases through frictional heat during sliding) can lower water pressure (and, in turn, sliding) by creating cavity space in excess of the generated volume of basal melt water. We also identify a non-intuitive positive feedback: strain softening of the ice near the bed during meltwater-induced speedup. This softening causes cavities to close more quickly, maintain higher water pressures, and enhance sliding. Furthermore, our results demonstrate that a sustained input of surface water to a distributed drainage system can lead to a speedup event that is short-lived even in the absence of channelization. When surface water input first reaches the subglacial drainage system, water pressure and sliding rise rapidly, but they both then lower as the cavities enlarge to accommodate the input. We examine these feedbacks and effects for a range of parameter values and assess under what realistic ice sheet and glacier conditions they may be important. JF - American Geophysical Union Fall Meeting AU - Hoffman, M J AU - Price, S F AU - Creyts, T T AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C33E EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623264093?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Glacier+sliding+feedbacks+in+a+coupled+subglacial+hydrology+and+ice+dynamics+model&rft.au=Hoffman%2C+M+J%3BPrice%2C+S+F%3BCreyts%2C+T+T%3BAnonymous&rft.aulast=Hoffman&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - High resolution characterization of heterogeneous Arctic tundra subsurface properties using a multiscale Bayesian fusion approach with geophysical datasets AN - 1623260920; 2014-087789 AB - Recent findings suggest that climate change has a significant impact on the arctic landscape, which could in turn cause feedback to the climate system due to the large amount of carbon stored in permafrost. A new Department of Energy, Office of Science project-called the Next-Generation Ecosystem Experiment (NGEE Arctic)-will develop a process-rich predictive model for understanding how permafrost thaw and degradation changes landscape, hydrology, biogeochemical processes and vegetation, and predicting how these changes affect the feedbacks to the climate system. The subsurface properties-such as active layer thickness (ALT), soil moisture, snow depth and geochemical parameters-are key parameters for such modeling; especially for simulation of the hydrological and geochemical processes that control microbial carbon decomposition. Although models require a large-scale domain to represent a system, these subsurface properties are known to be highly heterogeneous over small spatial scales due to the influence of factors such as microtopography and drainage network distribution. This work presents a data fusion method based on a hierarchical Bayesian model for integrating multiscale, multi-type datasets and prior knowledge to provide estimates of heterogeneous subsurface properties and their associated uncertainty. The surface geophysical data are non-invasive and spatially extensive, which increases the spatial coverage in subsurface and reveals the fine-scale variability. Remote sensing data can further increase the spatial coverage through the subsurface-surface property correlation. The model consists of two sub-models: data model and process model. First, the process model describes the heterogeneous field of each subsurface property mathematically; it can be a mechanistic model (e.g., land evolution model, hydrological model) or data-driven model. The data-driven process model - developed based on the prior knowledge and exploratory data analysis - is particularly powerful to constrain the estimation of heterogeneous fields in the arctic tundra system, where the mechanistic process models are highly complex. Second, the data model connects the heterogeneous field to multiscale datasets. Once we establish the data and process models, we estimate the heterogeneous fields using the Markov Chain Monte-Carlo method. We demonstrate our approach using co-located datasets collected at the Barrow Environmental Observatory, Alaska, including thaw depth, soil temperature, snow depth, aqueous geochemistry, ground penetrating radar data, electrical resistivity tomography, and airborne LIDAR. We obtain high-resolution estimates of ALT, soil water content, snow depth and other subsurface properties over a several hundred meter-scale domain, which allows us to closely examine the controls of, for example, microtopography on snow accumulation and resulting thaw depth and thermal profiles. We discuss the value and utility of the method and each dataset for parameterizing NGEE Arctic process-resolving reactive transport simulators and understanding linkages between land surface and subsurface variability. JF - American Geophysical Union Fall Meeting AU - Wainwright, H AU - Hubbard, S S AU - Gangodagamage, C AU - Rowland, J C AU - Liljedahl, A K AU - Gusmeroli, A AU - Dafflon, B AU - Ulrich, C AU - Wu, Y AU - Tweedie, C E AU - Wullschleger, S D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract B53E EP - 0715 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623260920?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=High+resolution+characterization+of+heterogeneous+Arctic+tundra+subsurface+properties+using+a+multiscale+Bayesian+fusion+approach+with+geophysical+datasets&rft.au=Wainwright%2C+H%3BHubbard%2C+S+S%3BGangodagamage%2C+C%3BRowland%2C+J+C%3BLiljedahl%2C+A+K%3BGusmeroli%2C+A%3BDafflon%2C+B%3BUlrich%2C+C%3BWu%2C+Y%3BTweedie%2C+C+E%3BWullschleger%2C+S+D%3BAnonymous&rft.aulast=Wainwright&rft.aufirst=H&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - The hydrology of Arctic landscapes with differing ice wedge polygon type through field measurements and modeling AN - 1623259671; 2014-087785 AB - Ice wedge polygons are common in landscapes underlain by permafrost. Still, their role on watershed-scale hydrology is constrained. We combined field measurements with thermal- and hydrologic modeling to assess the effect of ice wedge polygon type on landscape-scale hydrologic fluxes and stores. The physically-based model WaSiM was applied to airborne LiDAR and schematic DEMs, and forced by climate data from the Biocomplexity Experiment, Barrow, Alaska. Simulations and field measurements were concentrated to four sites, i.e. landscape types: high-centered, low-centered, and two transition polygon sites (the latter having both low-centers and troughs). Model simulations suggest that low-centered polygons, through elevated rims, reduce runoff while increasing evapotranspiration and water storage. The high-centered polygon landscape favors runoff, while storage and evapotranspiration drastically decrease. Continuous field measurements in neighboring, individual ice wedge polygons presents drastically different seasonal variability in water tables between study sites, despite the same landscape-scale end-of-winter snowpack water storage. It is evident from the field and modeling analyses that microtopography plays an important role on low-gradient Arctic wetland watershed-scale hydrology. Further, the fine microtopographical variability results in hydrologic characteristics that can present important geomorphological feedbacks. A shift in ice wedge polygon type could potentially dominate the initial effects of altered climate on Arctic wetland hydrology. JF - American Geophysical Union Fall Meeting AU - Liljedahl, A K AU - Wilson, C J AU - Daanen, R P AU - Schulla, J AU - Hinzman, L D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract B53E EP - 0711 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623259671?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+hydrology+of+Arctic+landscapes+with+differing+ice+wedge+polygon+type+through+field+measurements+and+modeling&rft.au=Liljedahl%2C+A+K%3BWilson%2C+C+J%3BDaanen%2C+R+P%3BSchulla%2C+J%3BHinzman%2C+L+D%3BAnonymous&rft.aulast=Liljedahl&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Geochemical characterization of lateral distribution of water and carbon in Arctic landscapes AN - 1623259663; 2014-087711 AB - Complex Arctic drainage networks can potentially lead to significant redistribution of significant amounts of dissolved and particulate carbon. The current generation of global climate models represent hydrology as primarily a vertical water balance. Excess water is assigned as stream flow and routed as highly simplified river networks from one grid cell to the next. Topographic features of lowland arctic landscapes, especially polygonal ground, thaw ponds, and lakes, comprise a complex and tortuous drainage network that impounds and routes a significant portion of snowmelt and precipitation. Climate driven warming and degradation of permafrost may lead to changes in the low relief features that control hydrology and lateral carbon transport in low gradient regions like the North Slope of Alaska. Sampling techniques are being deployed in a synoptic survey mode to quantify the connectivity of surface water features and the lateral redistribution of water and carbon throughout the landscape. We are deploying a combination of anchored piezometers, floating drive points, and diffusion cells at multiple depths in the saturated zone within the Barrow Environmental Observatory (BEO) as part of the Next Generation Ecosystem Experiment-Arctic project. Fiberglass wicks and macrorhizons are being employed to sample the unsaturated zone. Parameters to be analyzed include metals, anions, DOC, TOC, DON, dissolved methane, and isotopes of water, DIC and DOC. These results will allow us to better delineate hydrologic flow paths, redox transformations, biogeochemistry and lateral carbon fluxes. The thawed portion of the active layer during August 2012 ranged from 30-50 centimeters with a thin ( approximately 10 cm) organic horizon overlying clay soils. Lateral hydrologic fluxes appear to be predominately surface flows and subsurface flows in the thin organic layer. Findings on optimal sampling techniques will be presented along with surface and subsurface aqueous and isotopic geochemical results from a gradient of polygonal terrain ranging from high-centered to low-centered polygons. Results from drainages, ponds and lakes in the BEO will also be presented. Preliminary oxygen and deuterium isotope measurements from samples collected in September 2011 and June 2012 (the latter during snowmelt) show significant isotopic variation ranging from approximately -7 to -22 per mille and -75 to -165 per mille, respectively. Most samples fall along a local meteoric water line as calculated from GNIP data, though September pond and low-centered polygon samples are suggestive of a small evaporative effect. We will use these data to test improved representations of surface runoff and subsurface flow in high resolution physically based global models. JF - American Geophysical Union Fall Meeting AU - Newman, B D AU - Heikoop, J M AU - Wilson, C J AU - Gard, M AU - Altmann, Garrett AU - Liljedahl, A K AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract B21D EP - 0395 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623259663?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Geochemical+characterization+of+lateral+distribution+of+water+and+carbon+in+Arctic+landscapes&rft.au=Newman%2C+B+D%3BHeikoop%2C+J+M%3BWilson%2C+C+J%3BGard%2C+M%3BAltmann%2C+Garrett%3BLiljedahl%2C+A+K%3BAnonymous&rft.aulast=Newman&rft.aufirst=B&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Northern Hemisphere glacier and ice cap surface mass balance and runoff modeling AN - 1623258266; 2014-087821 AB - Mass loss of land-terminating glaciers and ice caps (GIC) has been documented in high-latitude regions, even though repeat observations have been limited. Here, we present new surface simulations for every individual GIC on the Northern Hemisphere north of 25 deg. N latitude and with surface areas greater than or equal to 1 km2. Recent dataset and modeling developments permit relatively high-resolution (1-km horizontal grid; 3-h time step) GIC estimates for 1979 through present. Using MicroMet and SnowModel in conjunction with land cover (the Randolph glacier inventory), topography, and the NASA Modern-Era Retrospective Analysis for Research and Applications (MERRA) atmospheric reanalysis data, a distributed and individual GIC dataset was created including air temperature, snow precipitation, winter mass-balance, summer mass-balance, net mass-balance, and freshwater runoff. Regional variability was analyzed to highlight the spatial and temporal variability in mass-balance between GIC in e.g., Alaska, Svalbard, Himalaya, Central Europe, Caucasus, etc., and the GIC contribution to global sea-level rise. JF - American Geophysical Union Fall Meeting AU - Mernild, S H AU - Liston, G E AU - Hiemstra (CRREL), C A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C31B EP - 0584 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623258266?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Northern+Hemisphere+glacier+and+ice+cap+surface+mass+balance+and+runoff+modeling&rft.au=Mernild%2C+S+H%3BListon%2C+G+E%3BHiemstra+%28CRREL%29%2C+C+A%3BAnonymous&rft.aulast=Mernild&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Carbon flux and isotopic character of soil and soil gas in stabilized and active thaw slumps in northwest Alaska AN - 1623258191; 2014-087714 AB - Permafrost soils store nearly half the world's global carbon. Warming of arctic landscape results in permafrost thaw which causes ground subsidence or thermokarst. On hillslopes, these features rapidly and dramatically alter soil structure, temperature, and moisture, as well as the content and quality of soil organic matter. These changes alter both the rate and mechanism of carbon cycling in permafrost soils, making frozen soils available to both anaerobic and aerobic decomposition. In order to improve our predictive capabilities, we use a chronosequence thaw slumps to examine how fluxes from active and stabilized features differ. Our study site is along the Selawik River in northwest Alaska where a retrogressive thaw slump initiated in the spring of 2004. It has grown to a surface area of 50,000 m2. Products of the erosion are stored on the floor of the feature, trapped on a fan or flushed into the Selawik River. North of slump is undisturbed tundra and adjacent to the west is a slump feature that stabilized and is now covered with a second generation of spruce trees. In this 2 year study, we use measurements of CO2 efflux, delta C13 in soil profiles and CO2 and CH4 abundance to constrain the response of belowground carbon emissions. We also focused on constraining which environmental factors govern C emissions within each of the above ecosystems. To this end, we measured soil temperature, and moisture, abundance and quality of soil organic carbon (SOC), water content, and bulk carbon compositions. Preliminary data from the summer of 2011 suggest that vegetation composition and soil temperature exert the strong control on CO2 efflux. The floor of the active slump and fan are bare mineral soils and are generally 10 to 15 degrees C warmer than the tundra and stabilized slump. Consistently decreasing delta C13 soil gas profiles in the recovered slump confirm that this region is a well-drained soil dominated by C3 vegetation. The delta C13 gas profiles for the tundra, active slump floor, and active fan tend to be more variable as a consequence of less consistently structured soils. This could be due to either the predominance of older carbon being recycled within these profiles or a skewed balance between anaerobic vs. aerobic respiration. JF - American Geophysical Union Fall Meeting AU - Jensen, Amy AU - Crosby, B T AU - Mora, C I AU - Lohse, K A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract B21D EP - 0399 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623258191?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Carbon+flux+and+isotopic+character+of+soil+and+soil+gas+in+stabilized+and+active+thaw+slumps+in+northwest+Alaska&rft.au=Jensen%2C+Amy%3BCrosby%2C+B+T%3BMora%2C+C+I%3BLohse%2C+K+A%3BAnonymous&rft.aulast=Jensen&rft.aufirst=Amy&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Active layer and permafrost thermal regimes in ice wedge polygon dominated regions of Alaska AN - 1623258138; 2014-087787 AB - Large areas of Alaskan Arctic tundra are covered by the patterned ground features created by repeated freezing and thawing of soil underlain by aerially continuous permafrost. Polygonal ground structures play an important role in controlling the surface-subsurface hydrology and thermal regimes of this dynamic landscape. Micro-topographic variations in these polygonal feature-dominated areas drive the surface-subsurface hydrologic flows which, in turn, have a strong influence on the subsurface thermal hydrology. Advective heat transport by surface flows and lateral movement of groundwater in the subsurface leads to complex heterogeneous subsurface thermal regimes. Differential heat transport mediated by lateral flows in the subsurface often leads to connectivity among the otherwise isolated polygons, thus changing the local scale hydrology in these systems. We investigate the soil thermal regimes and their control on local scale hydrology in areas of patterned ground using conceptual models and for sites near Barrow, Alaska, through simulations at sub-meter scale resolution for low-centered, high-centered and transition polygons. We also study the thermal and hydrologic characteristics of low- and high-centered polygons and develop schemes for representation, parameterization and scaling in the control of these localized processes for the larger landscape. We achieve this through characterization of the patterned ground using high resolution LiDAR and high fidelity simulations at various scales and resolutions combined with the coupled multiscale-multiphase-multicomponent surface-subsurface reactive flow and transport model PFLOTRAN. JF - American Geophysical Union Fall Meeting AU - Kumar, J AU - Bisht, G AU - Karra, S AU - Liljedahl, A K AU - Hoffman, F M AU - Mills, R T AU - Painter, S AU - Thornton, P E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract B53E EP - 0713 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623258138?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Active+layer+and+permafrost+thermal+regimes+in+ice+wedge+polygon+dominated+regions+of+Alaska&rft.au=Kumar%2C+J%3BBisht%2C+G%3BKarra%2C+S%3BLiljedahl%2C+A+K%3BHoffman%2C+F+M%3BMills%2C+R+T%3BPainter%2C+S%3BThornton%2C+P+E%3BAnonymous&rft.aulast=Kumar&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Observations of subglacial water pressure and velocity in the ablation region of Greenland AN - 1618134297; 2014-083732 AB - Subglacial water pressure in boreholes has been correlated with surface speeds on many alpine glaciers with the idea that increases in water pressure reduce the effective pressure, which allows for the ice to decouple from the bed causing sliding. We examine surface and borehole data from the ablation region of the Greenland Ice Sheet to investigate the relationship between water pressure and ice speed. We find that water pressure in boreholes is out of phase with velocities and that water pressure measured in a nearby moulin is in phase with velocities. We explore the possibility that the change of phase between moulin and borehole water pressure is related to two possible processes: 1) diffusion of the pressure wave from the moulin to the borehole sensor (located 150 m away) or 2) sliding near the moulin causes growth of subglacial cavities which permits a pressure drop in the adjacent boreholes. JF - American Geophysical Union Fall Meeting AU - Catania, G A AU - Andrews, L C AU - Hawley, Robert L AU - Hoffman, M J AU - Luethi, M P AU - Neumann, Thomas AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C11A EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134297?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Observations+of+subglacial+water+pressure+and+velocity+in+the+ablation+region+of+Greenland&rft.au=Catania%2C+G+A%3BAndrews%2C+L+C%3BHawley%2C+Robert+L%3BHoffman%2C+M+J%3BLuethi%2C+M+P%3BNeumann%2C+Thomas%3BAnonymous&rft.aulast=Catania&rft.aufirst=G&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - How good is a global climate model in simulating mass changes of mountain glaciers? AN - 1618133005; 2014-083802 AB - Current global climate models (GCMs) do not resolve mountain glaciers in their land surface scheme. Therefore, impact studies of climate change on glaciers still rely on dynamical or statistical downscaling of GCMs. Considering the complexity of a GCM with a full spectrum of parametrizations, it is necessary to identify the key processes on glacier-climate interface that need to be sufficiently well simulated by a GCM if mountain glaciers are to be implemented in the land-scheme of that GCM. In this study we validate current performance of the Community Earth System Model (CESM) in simulating climate processes that drive glacier mass balance on a regional scale. Glacier mass balance models of different complexities are compared: energy balance models which are forced by energy and humidity fluxes simulated by CESM for a glacier surface, and temperature-index models driven only by CESM 2 m air temperature at a glacier surface. We also investigate the use of statistical methods in representing glacier dynamics within the land surface scheme, since the physics-based glacier flow models require much higher resolution (<1 km) of surface topography than is available in the state-of-the-art GCMs. JF - American Geophysical Union Fall Meeting AU - Radic, V AU - Fyke, J G AU - Lipscomb, W H AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C13F EP - 0692 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618133005?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=How+good+is+a+global+climate+model+in+simulating+mass+changes+of+mountain+glaciers%3F&rft.au=Radic%2C+V%3BFyke%2C+J+G%3BLipscomb%2C+W+H%3BAnonymous&rft.aulast=Radic&rft.aufirst=V&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Hydrodynamic entrapment of petroleum within the Llanos Basin, Colombia AN - 1612265381; 2014-081954 AB - A three-dimensional groundwater flow model was constructed to evaluate hydrodynamic effects on secondary oil migration within the Llanos Basin, Colombia (Fig. 1a). Hydrodynamic stagnation zones formed within the Carbonara reservoir (Fig. 1b) in the eastern portion of the Llanos Basin where structural slopes are low and hydraulic head mounds associated with river networks drives ground water flow eastward down structural dip. Computed Hubbert oil potentials within the Carbonara-7 reservoir indicate a hydrodynamic stagnation zone formed in the vicinity of the Rubiales oil field (gray pattern, Fig. 1b); a giant, enigmatic hydrocarbon accumulation with no known structural closure. Flat to titled oil water contacts predicted by Hubbert oil potentials (Fig. 1c) were found to be consistent with observed oil-water contacts (Fig. 1d). Best agreement for the location of this stagnation zone occurred when using an oil density of API 12 suggesting that the Rubiales field's position is in dynamic equilibrium with modern head conditions and present-day oil densities. JF - American Geophysical Union Fall Meeting AU - Person, M A AU - Villamil, T AU - Gable, C W AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract T11E EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612265381?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Hydrodynamic+entrapment+of+petroleum+within+the+Llanos+Basin%2C+Colombia&rft.au=Person%2C+M+A%3BVillamil%2C+T%3BGable%2C+C+W%3BAnonymous&rft.aulast=Person&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - High-frequency terrestrial LiDAR scanning reveals connections between environmental drivers and thaw slump headwall retreat rate and form, Selawik River, Alaska AN - 1612265243; 2014-080145 AB - Retrogressive thaw slumps (RTS) occur in response to thawing permafrost and may increase in frequency and magnitude with climate change. Better understanding the drivers and mechanisms of RTS growth will inform how these features persist on the landscape as well as how material fluxes from these features to downslope environments will vary with changing weather patterns. The Selawik River RTS was identified in 2004 approximately 110 km upstream of Selawik Village in northwest Alaska and is approximately 250 m in diameter with an arcuate headwall approximately 20 m tall at its apex. The majority of the headwall is composed of glacial diamict with interstitial ice and sparse ice lenses; the upper 2 m are loess with interstitial and segregation ice. The contrasting sediments and high retreat rates ( approximately 20 m/yr) of the headwall provide an ideal setting to study headwall retreat mechanisms and drivers. Time-lapse photography have allowed the classification of headwall mass loss mechanisms and suggest that the morphology of the headwall changes from rilled to planar in response to changes in the efficacy of headwall ablation mechanisms, which are modulated by hydrologic and meteorologic drivers. A terrestrial laser scanner (TLS) was used at the site during the 2011 and 2012 field seasons to make high spatial and temporal resolution surveys of the feature over several weeks. A laser profiler was used during 2012 to record the retreat of the RTS headwall over several months. We find that the headwall retreats incrementally with no failure removing more than approximately 10 cm of material. Analysis of 2011 TLS surveys indicate a mean headwall retreat rate of 0.079+ or -0.02 m/day. An imbalance between surface overflow inputs and outflow to and from the feature suggest that solar radiation and air temperature may drive headwall retreat in addition to surface overflow. We find that the quantity of surface overflow entering the feature may control the morphology of the headwall while acting in concert with headwall substrate properties. Additionally, we find that the headwall retreat rate experiences diurnal fluctuations suggesting that air temperature and solar radiation, which are modulated by weather patterns, also exercise controls on headwall retreat rate. JF - American Geophysical Union Fall Meeting AU - Barnhart, T AU - Crosby, B T AU - Rowland, J C AU - Finnegan, David C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract EP31C EP - 0827 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612265243?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=High-frequency+terrestrial+LiDAR+scanning+reveals+connections+between+environmental+drivers+and+thaw+slump+headwall+retreat+rate+and+form%2C+Selawik+River%2C+Alaska&rft.au=Barnhart%2C+T%3BCrosby%2C+B+T%3BRowland%2C+J+C%3BFinnegan%2C+David+C%3BAnonymous&rft.aulast=Barnhart&rft.aufirst=T&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - Long-term changes in regular and low-frequency earthquake inter-event times near Parkfield, CA AN - 1612263394; 2014-080549 AB - The temporal evolution of earthquake inter-event time may provide important clues for the timing of future events and underlying physical mechanisms of earthquake nucleation. In this study, we examine inter-event times from 12-yr catalogs of approximately 50,000 earthquakes and approximately 730,000 LFEs in the vicinity of the Parkfield section of the San Andreas Fault. We focus on the long-term evolution of inter-event times after the 2003 Mw6.5 San Simeon and 2004 Mw6.0 Parkfield earthquakes. We find that inter-event times decrease by approximately 4 orders of magnitudes after the Parkfield and San Simeon earthquakes and are followed by a long-term recovery with time scales of approximately 3 years and more than 8 years for earthquakes along and to the southwest of the San Andreas Fault, respectively. The differing long-term recovery of the earthquake inter-event times is likely a manifestation of different aftershock recovery time scales that reflect the different tectonic loading rates in the two regions. We also observe a possible decrease of LFE inter-event times in some LFE families, followed by a recovery with time scales of approximately 4 months to several years. The drop in the recurrence time of LFE after the Parkfield earthquake is likely caused by a combination of the dynamic and positive static stress induced by the Parkfield earthquake, and the long-term recovery in LFE recurrence time could be due to post-seismic relaxation or gradual recovery of the fault zone material properties. Our on-going work includes better constraining and understanding the physical mechanisms responsible for the observed long-term recovery in earthquake and LFE inter-event times. JF - American Geophysical Union Fall Meeting AU - Wu, C AU - Shelly, D R AU - Johnson, P A AU - Gomberg, J S AU - Peng, Z AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S41C EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612263394?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Long-term+changes+in+regular+and+low-frequency+earthquake+inter-event+times+near+Parkfield%2C+CA&rft.au=Wu%2C+C%3BShelly%2C+D+R%3BJohnson%2C+P+A%3BGomberg%2C+J+S%3BPeng%2C+Z%3BAnonymous&rft.aulast=Wu&rft.aufirst=C&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - 3D resolution tests of two-plane wave approach using synthetic seismograms AN - 1612263101; 2014-080457 AB - Two-plane wave tomography (TPWT) is becoming a standard approach to obtain fundamental mode Rayleigh wave phase velocities for a variety of tectonic settings. A recent study by Ceylan et al. (2012) has applied this method to eastern Tibet, using data from INDEPTH-IV and Namche-Barwa seismic experiments. The TPWT assumes that distortion of wavefronts at each station can be expressed as the sum of two plane waves. However, there is currently no robust or complete resolution test for TPWT, to address its limitations such as wavefront healing. In this study, we test the capabilities of TPWT and resolution of INDEPTH-IV seismic experiment, by performing 3D resolution tests using synthetic seismograms. Utilizing SPECFEM3D software, we compute synthetic data sets resolving periods down to approximately 30 s. We implement a checkerboard upper mantle (for depths between 50 and 650 km) with variable cell sizes, superimposed to PREM as the background model. We then calculate fundamental mode surface wave phase velocities using TPWT for periods between 33-143 seconds, using synthetic seismograms computed from our three dimensional hypothetical model. Assuming a constant Poisson's ratio, we use partial derivatives from Saito (1988) to invert for shear wave velocities. We show that the combination of TPWT and Saito (1988) methods is capable of retrieving anomalies down to depths of approximately 200 km for Rayleigh waves. Below these depths, we observe evidence of both lateral and vertical smearing. We also find that the traditional method for estimating the resolution of TPWT consistently overestimates phase velocity resolutions. Love waves exhibit adequate resolution down to depths of approximately 100 km. At depths greater than 100 km, smearing is more evident in SH wave results than those of SV waves. Increased smearing of SH waves is most probably due to propagation characteristics and shallower sensitivity of Love waves. Our results imply that TPWT can be applied to Love waves, making future investigations of radial anisotropy possible at lithospheric depths. Moreover, ongoing tests for the retrieval of azimuthal fast direction will better constrain the reliability of the TPWT. JF - American Geophysical Union Fall Meeting AU - Ceylan, S AU - Larmat, C S AU - Sandvol, E A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S41A EP - 2360 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612263101?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=3D+resolution+tests+of+two-plane+wave+approach+using+synthetic+seismograms&rft.au=Ceylan%2C+S%3BLarmat%2C+C+S%3BSandvol%2C+E+A%3BAnonymous&rft.aulast=Ceylan&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - Texture and shape preferred orientation in mylonites developed under a complex kinematic frame; the Lalin-Forcarei Thrust (NW Iberian Massif, Spain) AN - 1612263091; 2014-080578 AB - Selected mylonites from a major shear zone in NW Iberian Massif, the Lalin-Forcarei thrust (LFT) , have been analyzed with time-of-flight (TOF) neutron diffraction for texture, and synchrotron X-ray microtomography for volume shape preferred orientation. The regional evolution of the structures indicates a complex frame where a general dextral oblique collision resulted into a progressive rotation of mylonitic linear shape fabric and an heterogeneous reworking of the crystallographic preferred orientation (or texture) along the LFT shear zone. As a result several groups of mylonitic lineations coexist across the LFT. Texture analysis of quartz mylonites results in a monoclinic symmetry of quartz and muscovite pole figures, coherent with a top-to-the NE shearing. Mylonitic amphibolites showed orthorhombic symmetry for major phases like albite and hornblende. Shear bands with a top-to-the SE sense of shear have been described in the amphibolites, which point to a stretching component along a NW-SE trend. X-ray microtomography experiments were done in quartz mylonites in order to constrain the kinematic frame (lineation and foliation) of the fabric, and correlate with texture obtained by neutron diffraction. Results support a general mylonitic flow to the NE within the LFT and suggest that rheological factors like mechanical contrast should be considered in the analysis of mylonitic fabric in complex orogenic systems. JF - American Geophysical Union Fall Meeting AU - Gomez Barreiro, J AU - Voltolini, M AU - Martinez-Catalan, J R AU - Wenk, H AU - Vogel, S C AU - Mancini, L AU - Diez-Fernandez, R AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract T23F EP - 2748 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612263091?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Texture+and+shape+preferred+orientation+in+mylonites+developed+under+a+complex+kinematic+frame%3B+the+Lalin-Forcarei+Thrust+%28NW+Iberian+Massif%2C+Spain%29&rft.au=Gomez+Barreiro%2C+J%3BVoltolini%2C+M%3BMartinez-Catalan%2C+J+R%3BWenk%2C+H%3BVogel%2C+S+C%3BMancini%2C+L%3BDiez-Fernandez%2C+R%3BAnonymous&rft.aulast=Gomez+Barreiro&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - American Geophysical Union 2012 fall meeting AN - 1612263035; 2014-080520 AB - Seismic event locations can be made more accurate and precise by computing predictions of seismic travel time through high fidelity 3D models of the wave speed in the Earth's interior. Given the variable data quality and uneven data sampling associated with this type of model, it is essential that there be a means to calculate high-quality estimates of the path-dependent variance and covariance associated with the predicted travel times of ray paths through the model. In this paper, we describe a methodology for accomplishing this by exploiting the full model covariance matrix and show examples of path-dependent travel time prediction uncertainty computed from SALSA3D, our global, seamless 3D tomographic P-velocity model. Typical global 3D models have on the order of 1/2 million nodes, so the challenge in calculating the covariance matrix is formidable: 0.9 TB storage for 1/2 of a symmetric matrix, necessitating an Out-Of-Core (OOC) blocked matrix solution technique. With our approach the tomography matrix (G which includes Tikhonov regularization terms) is multiplied by its transpose (GTG) and written in a blocked sub-matrix fashion. We employ a distributed parallel solution paradigm that solves for (GTG)-1 by assigning blocks to individual processing nodes for matrix decomposition update and scaling operations. We first find the Cholesky decomposition of GTG which is subsequently inverted. Next, we employ OOC matrix multiplication methods to calculate the model covariance matrix from (GTG)-1 and an assumed data covariance matrix. Given the model covariance matrix, we solve for the travel-time covariance associated with arbitrary ray-paths by summing the model covariance along both ray paths. Setting the paths equal and taking the square root yields the travel prediction uncertainty for the single path. JF - American Geophysical Union Fall Meeting AU - Ballard, S AU - Hipp, J R AU - Encarnacao, A AU - Young, C J AU - Begnaud, M L AU - Phillips, W S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S41A EP - 2423 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612263035?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=American+Geophysical+Union+2012+fall+meeting&rft.au=Ballard%2C+S%3BHipp%2C+J+R%3BEncarnacao%2C+A%3BYoung%2C+C+J%3BBegnaud%2C+M+L%3BPhillips%2C+W+S%3BAnonymous&rft.aulast=Ballard&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - Validation of 3D seismic velocity models using the spectral element method AN - 1612262631; 2014-080434 AB - For over a decade now, many research institutions have been focusing on addressing the Earth's 3D heterogeneities and complexities by improving tomographic methods. Utilizing dense array datasets, these efforts have led to unprecedented 3D seismic images, but little is done in terms of model validation or to provide any absolute assessment of model uncertainty. Furthermore, the question of "How good is a 3D geophysical model at representing the Earth's true physics?" remains largely not addressed in a time when 3D Earth models are used for societal and energy security. In the last few years, new horizons have opened up in earth structure imaging, with the advent of new numerical and mathematical methods in computational seismology and statistical sciences. We use these methods to tackle the question of model validation taking advantage of unique and extensive High Performance Computing resources available at Los Alamos National Laboratory. We present results from a study focused on validating 3D models for the Western USA generated using both ray-theoretical and finite-frequency approximations. In this manner we do not validate just the model but also the imaging technique. For this test case, we utilize the Dynamic North America (DNA) model family of UC Berkeley, as they are readily available in both formulations. We evaluate model performances by comparing observed and synthetic seismograms generated using the Spectral Element Method. Results show that both, finite-frequency and ray-theoretical DNA09 models, predict the observations well. Waveform cross-correlation coefficients show a difference in performance between models obtained with the finite-frequency or ray-theory limited to smallest periods (<15s), with no perceptible difference at longer periods (50-200s). At those shortest periods, and based on statistical analyses on S-wave phase delay measurements, finite-frequency shows an improvement over ray theory. We are also investigating the breakdown of ray-theory with an analysis of the real resolution of the imaging techniques taking into account the spatial sampling of the models. Implementation of the method for a densely instrumented region such as that covered by the DNA models provides a useful testbed for the validation methods that we are subsequently applying to other study areas. JF - American Geophysical Union Fall Meeting AU - Maceira, M AU - Larmat, C S AU - Porritt, R W AU - Higdon, D AU - Allen, R M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S34B EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612262631?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Validation+of+3D+seismic+velocity+models+using+the+spectral+element+method&rft.au=Maceira%2C+M%3BLarmat%2C+C+S%3BPorritt%2C+R+W%3BHigdon%2C+D%3BAllen%2C+R+M%3BAnonymous&rft.aulast=Maceira&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - Automatic infrasound detection and location of sources in the Western US AN - 1566816489; 2014-077762 AB - Infrasound event catalogs can be used to study the characteristics of events as well as the time varying nature of the atmosphere. Additionally, these catalogs can be used to identify sources that repeat and thus provide ground truth for atmospheric studies. We focus on the production of a western US regional infrasound catalog for the time period of April 2011 to March 2012. Data from the University of Utah Seismograph Stations (UUSS) infrasonic arrays are supplemented with data from three additional infrasound arrays in Nevada. An automated detection procedure was applied to the observations based on an adaptive F-detector (Arrowsmith et al., 2009). The detection results document significant seasonal variations in time and space; detections during the winter tend to produce higher correlations relative to those from the summer, and a seasonal variation in azimuth is observed. These results indicate that the bulletin is seasonally variable. Association of detections and event localization was done utilizing the Bayesian infrasonic source location procedure (BISL, Modrak et al., 2010), accounting for unknown atmospheric propagation effects by adding a random component to the infrasonic group velocity. The resulting infrasonic catalog consists of 963 events for the one-year time period with indication of repeated events from a number of locations. The distribution of infrasound events in this study is well matched with the infrasound hot spots identified by Walker et al. (2011) which were based on a back projection procedure applied to seismic signals from USArray Transportable Array. There are common concentrations of events in both catalogs that include New Bomb in Nevada, Utah Test and Training Range (UTTR), and Dugway Proving Ground in Utah, as well as broader areas in central Nevada and southwest Idaho. The two bulletins document that the vast majority of events occur during work hours, suggesting they are related to human activities. JF - American Geophysical Union Fall Meeting AU - Park, J AU - Arrowsmith, S AU - Hayward, C AU - Stump, B W AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract A52A EP - 06 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566816489?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Automatic+infrasound+detection+and+location+of+sources+in+the+Western+US&rft.au=Park%2C+J%3BArrowsmith%2C+S%3BHayward%2C+C%3BStump%2C+B+W%3BAnonymous&rft.aulast=Park&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Temporal clustering of great earthquakes AN - 1566816354; 2014-077898 AB - The last decade has seen a surge in the number of great earthquakes (magnitude M > or = 8), including three of the six largest events on record in the past century. These events have prompted speculation that large events are not random in time on a global scale, implying that global seismic hazard is currently elevated. Recent studies have addressed this question by applying several statistical tests that compare the earthquake catalogue to a process that is random in time (i.e. event times are uncorrelated). These studies show that the earthquake data do not deviate from a random process. We study the statistics of inter-event times between earthquakes, using the standard measure for fluctuations, the variance. Here we show significant deviations from a random process among earthquakes above magnitude 8.4-8.5 after removing aftershocks, which are known to cluster spatially and temporally near an earthquake. At other magnitude ranges, the data are consistent with a random process. If we only consider data since 1950, when instrumentation worldwide improved and event magnitudes become better constrained, the likelihood that the earthquake catalogue is random becomes remarkably small ( nearly equal 1/1000). We attribute the nonrandom behaviour to clustering in time of large earthquakes, as there are two clusters of events (one in the 1950s-1960s, and one from 2004-present) separated by a long period with no large events. JF - American Geophysical Union Fall Meeting AU - Daub, Eric G AU - Ben-Naim, E AU - Johnson, P A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S43H EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566816354?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Temporal+clustering+of+great+earthquakes&rft.au=Daub%2C+Eric+G%3BBen-Naim%2C+E%3BJohnson%2C+P+A%3BAnonymous&rft.aulast=Daub&rft.aufirst=Eric&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - SALSA3D; validating a global 3D P-velocity model of the Earth's crust and mantle for improved event location AN - 1566816003; 2014-078070 AB - We are developing a global 3D P wave velocity model of the Earth's crust and mantle using seismic tomography to assess improvement to seismic event locations obtained using high quality 3D Earth models in lieu of 1D and 2/2.5D models. We present the most recent version of SALSA3D (SAndia LoS Alamos 3D) version 1.9, and demonstrate its ability to reduce mislocations for a large set of realizations derived from a carefully chosen set of globally-distributed ground truth (GT) events. Our model is derived from the latest version of the GT catalog of P/Pn travel-time picks assembled by Los Alamos National Laboratory. For this current version, we employ more robust data quality control measures than previously used, as well as additional global GT data sources. To prevent over-weighting due to ray path redundancy and to reduce the computational burden, we cluster rays into representative rays. The model is represented using the triangular tessellation system described by Ballard et al. (2009), which incorporates variable resolution in both the geographic and radial dimensions. For our starting model, we use a simplified layer crustal model derived from the NNSA Unified model in Eurasia and Crust 2.0 model everywhere else, overlying a uniform ak135 mantle. Sufficient damping is used to reduce velocity adjustments so that ray path changes between iterations are small. We obtain proper model smoothness by using progressive grid refinement, refining the grid only in areas where the data warrant such a refinement. In previous versions, we based this refinement on velocity changes from previous model iterations. For the current version, we utilize the diagonal of the model resolution matrix to control where grid refinement occurs, resulting in more consistent and continuous areas of refinement than before. In addition to the changes in grid refinement, we also employ a more robust convergence criterion between successive grid refinements, allowing a better fit to first broader model features, then progressively to finer ones. Our approach produces a smooth, multi-resolution model with node density appropriate to both ray coverage and the velocity gradients required by the data. This scheme is computationally expensive, so we use a distributed computing framework based on the Java Parallel Processing Framework, providing us with nearly equal 400 processors. We compare the travel-time prediction and location capabilities to standard 1D and 2/2.5D models via location tests on a global event set with GT of 5 km or better. These events generally possess hundreds of Pn and P picks from which we generate different realizations of station distributions, yielding a range of azimuthal coverage and ratios of teleseismic to regional arrivals, with which we test the robustness and quality of relocation. For the current version of the model, we test using the full 3D covariance matrix to calculate path-dependent travel time uncertainty rather than standard 1D, distance-dependent uncertainty. The SALSA3D model reduces mislocation over the standard 1D ak135 model regardless of Pn to P ratio, with the improvement being most pronounced at higher azimuthal gaps. SALSA3D also reduces mislocation compared to the combined RSTT/ak135 model (2.5D - RSTT for regional phases), with SALSA3D and RSTT performing about the same when using only Pn arrivals in location tests. JF - American Geophysical Union Fall Meeting AU - Begnaud, M L AU - Ballard, S AU - Young, C J AU - Hipp, J R AU - Encarnacao, A AU - Phillips, W S AU - Chael, E P AU - Rowe, C A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S52D EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566816003?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=SALSA3D%3B+validating+a+global+3D+P-velocity+model+of+the+Earth%27s+crust+and+mantle+for+improved+event+location&rft.au=Begnaud%2C+M+L%3BBallard%2C+S%3BYoung%2C+C+J%3BHipp%2C+J+R%3BEncarnacao%2C+A%3BPhillips%2C+W+S%3BChael%2C+E+P%3BRowe%2C+C+A%3BAnonymous&rft.aulast=Begnaud&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - The Los Alamos Seismic Network (LASN); recent network upgrades and northern New Mexico earthquake catalog updates AN - 1566815391; 2014-078014 AB - From the first data recorded in the fall of 1973 to now, the Los Alamos Seismograph Network (LASN) has operated for nearly 40 years. LASN data has been used to locate more than 2,500 earthquakes in north-central New Mexico. The network was installed for seismic verification research, as well as to monitor and locate earthquakes near Los Alamos National Laboratory (LANL). LASN stations are the only earthquake monitoring stations in New Mexico north of Albuquerque. In the late 1970s, LASN included 22 stations spread over a geographic area of 150 km (N-S) by 350 km (E-W), of northern New Mexico. In the early 1980s, the available funding limited the stations that could be operated to a set of 7, located within an area of about 15 km (N-S) by 15 km (E-W), centered on Los Alamos. Over the last 3 years, 6 additional stations have been installed, which have considerably expanded the spatial coverage of the network. These new stations take advantage of broadband state-of-the-art sensors as well as digital recording and telemetry technology. Currently, 7 stations have broadband, three-component seismometers with digital telemetry, and the remaining 6 have traditional 1 Hz short-period seismometers with analog telemetry. In addition, a vertical array of accelerometers was installed in a wellbore on LANL property. This borehole station has 3-component digital strong-motion sensors. In addition, four forensic strong-motion accelerometers (SMA) are operated at LANL facilities. With 3 of the new broadband stations in and around the nearby Valles Caldera, LASN is now able to monitor any very small volcano-seismic events that may be associated with the caldera. We will present a complete description of the current LASN station, instrumentation and telemetry configurations, as well as the data acquisition and event-detection software structure used to record events in Earthworm. More than 2,000 earthquakes were detected and located in north-central New Mexico during the first 11 years of LASN's operation (1973 to 1984). With the subsequent downsizing of the network, only 1-2 earthquakes per month were detected and located within about 150 km of Los Alamos. Over 850 of these nearby earthquakes have been located from 1973 to present. We recently updated the LASN earthquake catalog for north-central New Mexico up through 2011 and most of 2012. This involved re-assessing phase picks and ensuring that all locations are derived using updated station locations and the best available velocity model. We are also looking at subsets of the catalog that include earthquake swarms and clusters and applying relative location techniques to obtain high-precision re-locations for these events. Most events that were detected and located by LASN have magnitudes less than 1.5 and do not appear in the catalogs of any other network. We will present a newly updated map of north-central New Mexico seismicity based on these recent efforts. JF - American Geophysical Union Fall Meeting AU - Roberts, P M AU - House, L S AU - Greene, M AU - Ten Cate, J A AU - Schultz-Fellenz, E S AU - Kelley, R E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S51C EP - 2444 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566815391?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+Los+Alamos+Seismic+Network+%28LASN%29%3B+recent+network+upgrades+and+northern+New+Mexico+earthquake+catalog+updates&rft.au=Roberts%2C+P+M%3BHouse%2C+L+S%3BGreene%2C+M%3BTen+Cate%2C+J+A%3BSchultz-Fellenz%2C+E+S%3BKelley%2C+R+E%3BAnonymous&rft.aulast=Roberts&rft.aufirst=P&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - A re-evaluation of global microseism intensity and extremal statistics AN - 1566809805; 2014-078171 AB - The Earth's seismic noise spectrum features two globally ubiquitous peaks, near 8 and 16 s period, that arise when storm-generated oceanic waves are converted to seismic energy, predominantly as surface waves. Following up on an earlier study of global microseism trends (Aster et al., 2010), we analyze multi-decadal digital seismic data from global stations associated with several networks to characterize the spatiotemporal evolution of Earth's wave climate through 2011. Ground motion power spectral density (PSD) is calculated over 3-hour overlapping time series segments to produce a comprehensive database of PSD statistics at each broadband station between 2 and 100 s. Statistical analysis over month-to-decadal time periods allows for the calculation of PSD probability density functions (PDF) that quantitatively characterize the likelihood of noise power levels within each period bin, and at each geographic, as a function of time. The results of this analysis are used to quantify changes in microseism power using the extreme event detector Microseism Index Number method of Aster et al. (2010) and via a variety of other illustrative metrics. Changes in ocean wave energy have the potential to drastically impact coastal environments, particularly under rising global sea levels, and to impact cryospheric stability. Seismic characterization of extreme storm intensities and frequencies may usefully compliment buoy, hindcast, satellite based, and other methods of characterizing global sea state on hourly to decadal time scales. JF - American Geophysical Union Fall Meeting AU - Anthony, R E AU - Aster, R C AU - Rowe, C A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S53H EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566809805?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+re-evaluation+of+global+microseism+intensity+and+extremal+statistics&rft.au=Anthony%2C+R+E%3BAster%2C+R+C%3BRowe%2C+C+A%3BAnonymous&rft.aulast=Anthony&rft.aufirst=R&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Continuing studies of dynamic triggering near Fangshan, Beijing AN - 1566809717; 2014-078197 AB - Dynamic triggering of shallow microearthquakes around the Fangshan Pluton near Beijing, China is repeatedly identified. Here we report clear triggered events in this region during the surface waves of the 2012 Mw8.6 Sumatra earthquake. However, we did not identify any triggered events during the G2 waves of the Mw8.6 event, and the surface waves of the Mw8.2 Sumatra earthquake that occurred two hours later. We also reanalyze other 5 Sumatra earthquakes since 2004 and find that 2004 Mw9.2 earthquake triggered local earthquakes around the Fangshan Pluton, while the 2007 Mw 7.9 and 2010 Mw 7.8 Sumatra earthquakes did not trigger in the same area. The results are not clear for the 2005 Mw 8.6 and the 2007 Mw8.5 earthquakes. The high-frequency amplitudes during the teleseismic surface waves show a positive correlation with long-period peak ground velocities (PGVs), consistent with the prediction of the clock-advance model. We find that both PGVs and elapsed time since last trigger are important in controlling the triggering potential in this region. To further understand the relationship between background and triggered earthquakes in this region, we have deployed an 11-station temporary seismic network between 12/2010 and 08/2011. This deployment was fortunate because we recorded clear triggered microearthquakes during the 2011 Mw9.0 Tohoku-Oki earthquake. In addition, we started to analyze background seismicity approximately 1 month before and after the Tohoku-Oki mainshock. Preliminary analyses suggest that thousands of microearthquakes have occurred in this region, and their locations are close to those triggered earthquakes. Our next step is to use the recently developed matched filter technique to detect all possible microearthquakes recorded by this temporary network, and use them to better understand the evolution of seismic activity around the Tohoku-Oki mainshock. JF - American Geophysical Union Fall Meeting AU - Wang, W AU - Wu, J AU - Peng, Z AU - Gong, X AU - Chen, Q AU - Wu, C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S54B EP - 05 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566809717?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Continuing+studies+of+dynamic+triggering+near+Fangshan%2C+Beijing&rft.au=Wang%2C+W%3BWu%2C+J%3BPeng%2C+Z%3BGong%2C+X%3BChen%2C+Q%3BWu%2C+C%3BAnonymous&rft.aulast=Wang&rft.aufirst=W&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Acoustic analysis of plutonium and nuclear weapon components at Los Alamos National Laboratory AN - 1566809707; 2014-078169 AB - One of the primary missions of Los Alamos National Laboratory is to use science based techniques to certify the nuclear weapons stockpile of the United States. As such we use numerous NDE techniques to monitor materials and systems properties in weapons. Two techniques will be discussed in this presentation, Acoustic Resonance Spectroscopy (ARS) and Acoustic Emission (AE). ARS is used to observe manufacturing variations or changes in the plutonium containing component (pit) of the weapon system. Both quantitative and qualitative comparisons can be used to determine variation in the pit components. Piezoelectric transducer driven acoustic resonance experiments will be described along with initial qualitative and more complex analysis and comparison techniques derived from earthquake analysis performed at LANL. Similarly, AE is used to measure the time of arrival of acoustic signals created by mechanical events that can occur in nuclear weapon components. Both traditional time of arrival techniques and more advanced techniques are used to pinpoint the location and type of acoustic emission event. Similar experiments on tensile tests of brittle phases of plutonium metal will be described. JF - American Geophysical Union Fall Meeting AU - Saleh, T A AU - Reynolds, Joe J AU - Rowe, C A AU - Freibert, F J AU - Ten Cate, J A AU - Ulrych, Tadeusz J AU - Farrow, A M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S53H EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566809707?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Acoustic+analysis+of+plutonium+and+nuclear+weapon+components+at+Los+Alamos+National+Laboratory&rft.au=Saleh%2C+T+A%3BReynolds%2C+Joe+J%3BRowe%2C+C+A%3BFreibert%2C+F+J%3BTen+Cate%2C+J+A%3BUlrych%2C+Tadeusz+J%3BFarrow%2C+A+M%3BAnonymous&rft.aulast=Saleh&rft.aufirst=T&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Extracting Earth attenuation from seismic noise AN - 1566809453; 2014-078048 AB - Extracting travel-time information from seismic ambient noise has reached great success and remains fast growing. However, it is still challenging to extract reliable attenuation properties of the Earth structure from noise. Perhaps the key lies in the development of novel techniques that can take into account the effect of the uneven distribution of noise sources. In this paper we examine line-array examples and compare the noise cross-correlation (CC) derived attenuation coefficients with those from earthquake data. We demonstrate that two processing procedures: (1) transient removal and temporal flattening, and more effectively (2) correlation of the coda of correlation (C3), can reduce bias and allow us to obtain more reliable attenuation estimates from noise. We present noise-derived attenuation tomography of the western U.S. using long-period, vertical-component seismic data recorded by the Transportable Array (TA) and Southern California Seismic Network (CI) of the USArray components. JF - American Geophysical Union Fall Meeting AU - Zhang, J AU - Yang, X AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract S51G EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566809453?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Extracting+Earth+attenuation+from+seismic+noise&rft.au=Zhang%2C+J%3BYang%2C+X%3BAnonymous&rft.aulast=Zhang&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Seismic and gravity investigations of the Caja Del Rio geothermal area, New Mexico AN - 1560082436; 2014-067071 AB - The SAGE (Summer of Applied Geophysical Experience) program collected new seismic and gravity data in 2012 in the Caja del Rio area of northern New Mexico. The area, about 25 km NW of Santa Fe, has been identified as a potential geothermal resources area based on relatively high temperature gradients in drill holes. The SAGE 2012 data collection was part of an integrated geophysical study of the area initiated in 2011. Seismic data consisted of a 6.4 km SE to NW profile (80 three-component stations, 20 m station spacing, using a Vibroseis source - 20 m spacing for reflection VPs; 800 m spacing for refraction VPs) with both refraction and CMP reflection coverage. The surface conditions (dry unconsolidated cover over a thin volcanic layer) increased surface wave energy and limited the signal-to-noise level of the refraction and reflection arrivals. The refraction data were modeled with first arrival travel time methods. The reflection data were processed to produce a CMP stacked record section. Strong, NW-dipping reflectors, interpreted as from the Espinaso formation, are visible at about 1.4 seconds two-way time. One hundred and sixty-four new gravity measurements (detailed data at 500 m spacing along the seismic profile and regional stations) were collected and combined with existing regional data for modeling. Interpretation of the seismic and gravity data was aided by refraction velocities, the existence of a nearby regional seismic reflection profile from industry, and lithologies and well-logs from a deep well. The sedimentary basin interpreted from the seismic and gravity data, along with existing geological and geophysical information, consists of a thick section of Tertiary rift fill (capped by a thin layer of volcanic rocks), over Mesozoic and Paleozoic rocks, with a total basin thickness of about 3 km. JF - American Geophysical Union Fall Meeting AU - Braile, L W AU - Burke, B AU - Butler, E AU - Harper, C AU - Livermore, J AU - McGlannan, A AU - Wasik, A AU - Baldridge, W S AU - Biehler, S AU - Ferguson, J F AU - McPhee, D K AU - Snelson, C M AU - Sussman, A J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract T21B EP - 2560 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1560082436?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Seismic+and+gravity+investigations+of+the+Caja+Del+Rio+geothermal+area%2C+New+Mexico&rft.au=Braile%2C+L+W%3BBurke%2C+B%3BButler%2C+E%3BHarper%2C+C%3BLivermore%2C+J%3BMcGlannan%2C+A%3BWasik%2C+A%3BBaldridge%2C+W+S%3BBiehler%2C+S%3BFerguson%2C+J+F%3BMcPhee%2C+D+K%3BSnelson%2C+C+M%3BSussman%2C+A+J%3BAnonymous&rft.aulast=Braile&rft.aufirst=L&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-09-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - A new application of a finite element heat and mass transfer numerical modeling code (FEHM) to heat and fluid circulation in lava domes AN - 1560082235; 2014-067224 AB - Lava domes have been well-characterized in terms of their surface structure and activity, but there is much to be learned about their internal structure and geothermal systems. Even when a lava dome is no longer actively erupting, subsurface studies are often difficult to conduct; lava domes are highly complex structures, but their rugged nature often precludes systematic drilling and/or geophysical surveys. Because of this, we know little about the internal geothermal activity that may still contribute to both hazards and opportunities for exploitation of mineral deposits and hot groundwater. Despite the difficulty of studying the interior of lava domes directly, numerical modeling can still provide insights into the behavior of their geothermal systems. Lava domes have the potential to be highly transmissive structures, and the presence of hot springs in the vicinity of lava domes (Santiaguito in Guatemala, La Soufriere on Guadeloupe) suggests that water circulation may be an important process in post-eruptive dome evolution. FEHM, a heat and mass transfer modeling code developed at Los Alamos National Laboratory (fehm.lanl.gov) is an ideal tool to study fluid and gas circulation in geologic structures. FEHM was developed for subsurface reservoir modeling (originally for the Hot Dry Rock geothermal project) and is capable of dealing with both high- (magmatic) and low-temperature fluids. In this study, FEHM has been used in combination with a LANL-developed grid-generating utility (LaGriT) to create an idealized model of water circulation in a saturated lava dome. Multiple material regions are used to represent the dome core, outer talus layer, conduit, and volcanic substrate. Material properties (such as permeability, porosity, density, etc.) were chosen from a combination of literature review and sensitivity testing using a simplified dome geometry and a continuum modeling approach that accounts for fractures (Equivalent Porous Medium) was used when applying those properties to dome material regions. Further modifications to the dome geometry and material properties were made to better simulate specific lava domes, including Santiaguito in Guatemala and Unzen in Japan. Preliminary results suggest that FEHM produces a reasonable simulation of fluid movement in a saturated, post-eruptive (cooling) lava dome, with recharge from meteoric water, over periods of years to decades. This model setup is applicable to the older lava domes at Santiaguito and the dome at Unzen. The simulations presented were restricted at this point to lower temperature materials (< 250 degrees C) to avoid computationally more intensive phase change. A grid based on the geometry of the older Santiaguito lava domes has produced temperature gradients and fluid flow paths in a similar location to hot springs at the real dome complex. JF - American Geophysical Union Fall Meeting AU - Ball, J L AU - Stauffer, P H AU - Calder, E S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V13A EP - 2813 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1560082235?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+new+application+of+a+finite+element+heat+and+mass+transfer+numerical+modeling+code+%28FEHM%29+to+heat+and+fluid+circulation+in+lava+domes&rft.au=Ball%2C+J+L%3BStauffer%2C+P+H%3BCalder%2C+E+S%3BAnonymous&rft.aulast=Ball&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-09-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Improved phase arrival estimate and location for local earthquakes in South Korea AN - 1553087360; 2014-061538 AB - The Korean Institute of Geoscience and Mineral Resources (KIGAM) and the Korean Meteorological Agency (KMA) regularly report local (distance < nearly equal 1200 km) seismicity recorded with their networks; we obtain preliminary event location estimates as well as waveform data, but no phase arrivals are reported, so the data are not immediately useful for earthquake location. Our goal is to identify seismic events that are sufficiently well-located to provide accurate seismic travel-time information for events within the KIGAM and KMA networks, and also recorded by some regional stations. Toward that end, we are using a combination of manual phase identification and arrival-time picking, with waveform cross-correlation, to cluster events that have occurred in close proximity to one another, which allows for improved phase identification by comparing the highly correlating waveforms. We cross-correlate the known events with one another on 5 seismic stations and cluster events that correlate above a correlation coefficient threshold of 0.7, which reveals few clusters containing few events each. The small number of repeating events suggests that the online catalogs have had mining and quarry blasts removed before publication, as these can contribute significantly to repeating seismic sources in relatively aseismic regions such as South Korea. The dispersed source locations in our catalog, however, are ideal for seismic velocity modeling by providing superior sampling through the dense seismic station arrangement, which produces favorable event-to-station ray path coverage. Following careful manual phase picking on 104 events chosen to provide adequate ray coverage, we re-locate the events to obtain improved source coordinates. The re-located events are used with Thurber's Simul2000 pseudo-bending local tomography code to estimate the crustal structure on the Korean Peninsula, which is an important contribution to ongoing calibration for events of interest in the region. JF - American Geophysical Union Fall Meeting AU - Morton, E AU - Rowe, C A AU - Begnaud, M L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract T53A EP - 2679 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1553087360?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Improved+phase+arrival+estimate+and+location+for+local+earthquakes+in+South+Korea&rft.au=Morton%2C+E%3BRowe%2C+C+A%3BBegnaud%2C+M+L%3BAnonymous&rft.aulast=Morton&rft.aufirst=E&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-08-14 N1 - CODEN - #07548 ER - TY - JOUR T1 - Laboratory measurement of the optical properties of hematite and desert dust aerosols to assess their climate forcing AN - 1553085204; 2014-063536 AB - Globally, aerosol mass emissions and optical depths are dominated by entrained mineral dust. While most minerals occurring in dust aerosols do not absorb solar radiation, some minerals cause significant absorption, thereby lowering the single scatter albedo (SSA) significantly below one, potentially contributing to a warmer and drier atmosphere. Therefore, the optical properties of globally relevant dust aerosols need to be characterized to reduce uncertainties in their radiative forcings. A well-known absorbing component found in dust aerosols is hematite, Fe2O3, which absorbs strongly in the blue-green spectral region, giving some soils, rocks, and dust aerosols their characteristic red color. We discuss measurements of the optical properties of approximately 30 dust aerosols, including a pure hematite standard, hematite-containing mineral dust standards ranging from 9-34% hematite by mass, and various dust samples collected from around the world. Samples are suspended from aqueous solution and/or from dry atomization with a cyclone re-suspension chamber yielding the fine fraction relevant for long-range transport. Size distributions were characterized with an optical aerosol spectrometer; absorption and scattering coefficients were measured with a three-wavelength photoacoustic soot spectrometer (PASS-3) at 405, 532, and 781 nm and with an ultraviolet photoacoustic soot spectrometer (PASS-UV) at 375 nm yielding wavelength-dependent mass absorption coefficients (MAC's), SSA's, and wavelength dependent Angstrom exponents. Hematite MAC's are an order of magnitude smaller than those of black carbon (BC) at 405 nm and 532 nm and are largely non-absorbing at 781 nm with SSA's of 0.49 0.68 and 0.98, respectively. JF - American Geophysical Union Fall Meeting AU - Moosmuller, Hans AU - Aiken, A C AU - Dubey, M K AU - Frey, G AU - Garro, Bruce AU - Engelbrecht, Johann P AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract A23F EP - 0300 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1553085204?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Laboratory+measurement+of+the+optical+properties+of+hematite+and+desert+dust+aerosols+to+assess+their+climate+forcing&rft.au=Moosmuller%2C+Hans%3BAiken%2C+A+C%3BDubey%2C+M+K%3BFrey%2C+G%3BGarro%2C+Bruce%3BEngelbrecht%2C+Johann+P%3BAnonymous&rft.aulast=Moosmuller&rft.aufirst=Hans&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-08-14 N1 - CODEN - #07548 ER - TY - JOUR T1 - Dynamics of CD4+ T Cell Responses against Listeria monocytogenes AN - 1551615338; 20354213 AB - The generation of CD4+ T cell memory cells is poorly understood. Recently, two different murine CD4+ TCR transgenic T cell lines, LLO118 and LLO56, both specific for the same epitope but differing in their expression level of the cell surface protein CD5, were generated. Notably, these cell lines showed different behavior upon primary and secondary exposure to Listeria monocytogenes. Whereas LLO118 showed a stronger primary response and generated more robust CD8+ T cell help upon secondary exposure, LLO56 CD4+ T cells had a dramatically better recall response. Using different mathematical models, we analyzed the dynamics of the two CD4+ T cell lines in mice during infection with L. monocytogenes. Our models allowed the quantitative comparison of the two T cell lines and provided predictions for the conversion of naive T cells into memory cells. LLO118 CD4+ T cells are estimated to have a higher proliferation rate than LLO56 CD4+ T cells upon primary exposure. This difference can be explained by the lower expression level of CD5 on LLO118 CD4+ T cells. Furthermore, LLO56 memory cells are predicted to have a 3-fold longer half-life than LLO118 memory cells ([Formula] approximately 4.3 to 5 d and [Formula] approximately 11.5 to 13.9 d). Although both cell lines differ in their memory capabilities, our analysis indicates no difference in the rate at which memory cells are generated. Our results show that different CD5 expression levels influence the proliferation dynamics of activated naive CD4+ T cells while leaving the conversion rate of those cells into memory cells unaffected. JF - Journal of Immunology AU - Graw, Frederik AU - Weber, KScott AU - Allen, Paul M AU - Perelson, Alan S AD - Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, NM 87545; and Y1 - 2012/12/01/ PY - 2012 DA - 2012 Dec 01 SP - 5250 EP - 5256 PB - American Association of Immunologists, 9650 Rockville Pike Bethesda MD 20814-3998 United States VL - 189 IS - 11 SN - 0022-1767, 0022-1767 KW - Microbiology Abstracts B: Bacteriology; Immunology Abstracts KW - Listeria monocytogenes KW - Cell surface KW - T-cell receptor KW - Mathematical models KW - Memory cells KW - Animal models KW - CD8 antigen KW - Infection KW - CD4 antigen KW - CD5 antigen KW - Lymphocytes T KW - Cell proliferation KW - Epitopes KW - J 02350:Immunology KW - F 06910:Microorganisms & Parasites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1551615338?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Immunology&rft.atitle=Dynamics+of+CD4%2B+T+Cell+Responses+against+Listeria+monocytogenes&rft.au=Graw%2C+Frederik%3BWeber%2C+KScott%3BAllen%2C+Paul+M%3BPerelson%2C+Alan+S&rft.aulast=Graw&rft.aufirst=Frederik&rft.date=2012-12-01&rft.volume=189&rft.issue=11&rft.spage=5250&rft.isbn=&rft.btitle=&rft.title=Journal+of+Immunology&rft.issn=00221767&rft_id=info:doi/10.4049%2Fjimmunol.1200666 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-08-01 N1 - Last updated - 2014-10-02 N1 - SubjectsTermNotLitGenreText - Cell surface; T-cell receptor; CD4 antigen; Mathematical models; CD5 antigen; Animal models; Memory cells; Lymphocytes T; CD8 antigen; Infection; Cell proliferation; Epitopes; Listeria monocytogenes DO - http://dx.doi.org/10.4049/jimmunol.1200666 ER - TY - JOUR T1 - Fe-saponite and chlorite growth on stainless steel in hydrothermal engineered barrier experiments AN - 1549621371; 2014-057201 AB - The United States recently has initiated the Used Fuel Disposition campaign to evaluate various generic geological repositories for the disposal of high-level, spent nuclear fuel within environments ranging from hard-rock, salt/clay, to deep borehole settings. Previous work describing Engineered Barrier Systems (EBS) for repositories focused on low temperature and pressure conditions. The focus of this experimental work is to characterize the stability and alteration of a bentonite-based EBS with different waste container materials in brine at higher heat loads and pressures. All experiments were run at approximately 150 bar and 125 to 300 C for approximately 1 month. Unprocessed bentonite from Colony, Wyoming was used in the experiments as the clay buffer material. The redox conditions for each system were buffered along the magnetite-iron oxygen fugacity univariant curve using Fe3O4 and Feo filings. A K-Na-Ca-Cl-based salt solution was chosen to replicate deep groundwater compositions. The experimental mixtures were 1) salt solution-clay; 2) salt solution-clay-304 stainless steel; and 3) salt solution-clay-316 stainless steel with a water/bentonite ratio of approximately 9. Mineralogy and aqueous geochemistry of each experiment was evaluated to monitor the reactions that took place. No smectite illitization was observed in these reactions. However, it appears that K-smectite was produced, possibly providing a precursor to illitization. It is unclear whether reaction times were sufficient for bentonite illitization at 212 and 300 C or whether conditions conducive to illite formation were obtained. The more notable clay mineral reactions occurred at the stainless steel surfaces. Authigenic chlorite and Fe-saponite grew with their basal planes near perpendicular to the steel plate, forming a 10-40 mu m thick 'corrosion' layer. Partial dissolution of the steel plates was the likely iron source for chlorite/saponite formation; however, dissolution of the Feo/Fe3O4 may also have acted as an iron source, with the steel plates acting as a substrate for chlorite/saponite growth. Trace amounts of pyrite in the bentonite appeared to have reacted to form H2S gas and pentlandite ((Ni,Fe)8S9). Mineral growth on the waste containers was influenced by the container, buffer, and fluid compositions, in addition to pressure and temperature conditions. No significant mineralogical changes were apparent away from the steel-smectite interface. Results of this research show that the waste container may act as a substrate for mineral growth in response to corrosion. However, it is presently unknown whether chlorite and Fe-saponite will act as passivating agents or whether their presence will facilitate further corrosion of the waste containers. The role of these Fe-rich minerals on the stability of steel canisters at elevated heat loads is currently under investigation. JF - American Geophysical Union Fall Meeting AU - Cheshire, M C AU - Caporuscio, F A AU - McCarney, M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V51A EP - 2767 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549621371?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Fe-saponite+and+chlorite+growth+on+stainless+steel+in+hydrothermal+engineered+barrier+experiments&rft.au=Cheshire%2C+M+C%3BCaporuscio%2C+F+A%3BMcCarney%2C+M%3BAnonymous&rft.aulast=Cheshire&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - The Mars science laboratory mission: early results from Gale Crater landing site AN - 1549621211; 2014-056992 AB - The Mars Science Laboratory rover, Curiosity, landed at Gale Crater on August 5th (PDT) and initiated an investigation of modern and ancient environments. The 155-km diameter Gale Crater was chosen as Curiosity's field site based on several attributes: the interior Mount Sharp preserves a succession of flat-lying strata extending almost 5 km above the elevation of the landing site; the lower few hundred meters of the mound show a progression with relative age from clay-bearing to sulfate-bearing strata, separated by an unconformity from overlying likely anhydrous strata; the landing ellipse is characterized by a mixture of alluvial fan and high thermal inertia/high albedo stratified deposits; and a number of stratigraphically/geomorphically distinct fluvial features. Gale's regional context and strong evidence for a progression through multiple potentially habitable environments, represented by a stratigraphic record of extraordinary extent, ensure preservation of a rich record of the environmental history of early Mars. Curiosity has an expected lifetime of at least one Mars year ( approximately 23 months), and drive capability of at least 20 km. The MSL science payload was specifically assembled to assess habitability and includes a gas chromatograph-mass spectrometer and gas analyzer that will search for organic carbon in rocks, regolith fines, and the atmosphere (SAM); an x-ray diffractometer that will determine mineralogical diversity (CheMin); focusable cameras that can image landscapes and rock/regolith textures in natural color (MAHLI, Mastcam); an alpha-particle x-ray spectrometer for in situ determination of rock and soil chemistry (APXS); a laser-induced breakdown spectrometer to remotely sense the chemical composition of rocks and minerals (ChemCam); an active/passive neutron spectrometer designed to search for water in rocks/regolith (DAN); a weather station to measure modern-day environmental variables (REMS); and a sensor designed for continuous monitoring of background solar and cosmic radiation (RAD; Cruise measurements began on December 6, 2011). The MARDI descent camera is being evaluated for use in the surface mission. The Sample Acquisition, Processing, and Handling (SA/SPaH) subsystem is responsible for the acquisition of rock and soil samples from the Martian surface and the processing of these samples into fine particles that are then distributed to the analytical science instruments (CheMin and SAM). The SA/SPaH subsystem is also responsible for the placement of the two contact instruments (APXS, MAHLI) on rock and soil targets. SA/SPaH consists of a robotic arm and turret-mounted devices on the end of the arm, which include a drill, brush, soil scoop, sample processing device, and the mechanical and electrical interfaces to the two contact science instruments. SA/SPaH also includes two spare drill bits, five organic check material samples, and an observation tray, which are all mounted on the front of the rover, and inlet cover mechanisms that are placed over the SAM and CheMin solid sample inlet tubes on the rover top deck. Recent mission results will be discussed. The first month or two of the mission is designed as a Commissioning Activity Period (CAP) in which each science instrument and rover subsystem is tested in sequence, but done in a fashion that insures science measurements also are obtained. JF - American Geophysical Union Fall Meeting AU - Grotzinger, J P AU - Blake, David F AU - Crisp, J A AU - Edgett, K S AU - Gellert, R AU - Gomez-Elvira, J AU - Hassler, D M AU - Mahaffy, Paul R AU - Malin, M C AU - Meyer, Michael A AU - Mitrofanov, Igor AU - Vasavada, Ashwin R AU - Wiens, R C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract U13A EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549621211?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+Mars+science+laboratory+mission%3A+early+results+from+Gale+Crater+landing+site&rft.au=Grotzinger%2C+J+P%3BBlake%2C+David+F%3BCrisp%2C+J+A%3BEdgett%2C+K+S%3BGellert%2C+R%3BGomez-Elvira%2C+J%3BHassler%2C+D+M%3BMahaffy%2C+Paul+R%3BMalin%2C+M+C%3BMeyer%2C+Michael+A%3BMitrofanov%2C+Igor%3BVasavada%2C+Ashwin+R%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Grotzinger&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/U/sessions/U13A/abstracts/U13A-01 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Pore characteristics and water dynamics in nuclear waste repository systems; a neutron study AN - 1549620962; 2014-057193 AB - The functional relationship between pore characteristics and fluid transport behavior of geological materials at field conditions from nanometer to micrometer scale provide fundamental insights into their performance efficiency as barrier materials and their role in regulating radionuclide transport in nuclear waste repositories. The unique interactions of neutrons with matter enable probing nano- to the micro-scale structures in bulk samples and in situ studies under various environmental conditions such as humidity, high pressure and temperature. Using small-angle neutron scattering (SANS), we have studied the pore structures of a number of materials relevant to nuclear waste repository systems, such as clays and rock salt under field conditions. Our SANS measurements for smectite as function of temperature at 100% relative humidity (RH) indicated that with increasing temperature there are changes in pore features from 1-100 nm. Further data analysis indicated that, as temperature increases from 25 degrees C to 75 degrees C, the d-spacing of the smectite increases from 15Aa to 17Aa. Besides the effect of temperature and pressure on pore characteristics of clays and rock salt, our results also show that swelling and non-swelling clays display different behavior with respect to water adsorption and moisture diffusivity. Our results demonstrate that SANS is particularly suited for in situ studies of pore-scale characteristics of geological materials and the factors that impact their pore features. As emergent property, nano- to micro-scale structural characterization is crucial in providing insights into pore-scale processes, which are pertinent to upscale continuum model development. JF - American Geophysical Union Fall Meeting AU - Ding, M AU - Xu, H AU - Hartl, M A AU - Hjelm, R P, Jr AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V51A EP - 2759 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620962?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Pore+characteristics+and+water+dynamics+in+nuclear+waste+repository+systems%3B+a+neutron+study&rft.au=Ding%2C+M%3BXu%2C+H%3BHartl%2C+M+A%3BHjelm%2C+R+P%2C+Jr%3BAnonymous&rft.aulast=Ding&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Chemical composition of rocks and soils at Gale Crater, Mars AN - 1549620155; 2014-056995 AB - Gale crater was selected as the landing site for the Mars Science Laboratory rover for its 5 km tall sedimentary mound, which includes phyllosilicate-containing layers near its base. Gale (5.4 degrees S 137.8 degrees E) is located near the north-south dichotomy and is one of the deepest craters in the region (lowest elevation is -4674 m). The lower part of the crater, near the landing ellipse, features an alluvial fan descending from the rim and overlying a region of high thermal inertia which appears to be layered. In addition to the fan, inverted channels indicate that water flowed in this region prior to some deflation. Nearer to the mound lies a dune field, and water-carved canyons descend from the mound. The Curiosity rover is equipped with several instruments with broad elemental composition capabilities to investigate along the traverse the expected variations in rock and soil types representing different kinds of environments in early Martian history. The remote sensing instrument, ChemCam, determines semi-quantitative elemental compositions using laser induced breakdown spectroscopy (LIBS) to a distance of up to 7 m with an analysis footprint < or = 0.5 mm in diameter, and also providing context images with better than 100 microradian resolution. ChemCam is capable of rapidly analyzing nearly all elements including light elements H through O, although atmospheric species can interfere with C and N observations. Using multiple laser pulses per analysis location allows dust to be removed from the analysis locations remotely, and facilitates depth profiles up to 1 mm in rocks and deeper in soils. For tactical operations, in addition to overall reconnaissance, ChemCam analyses will aid in determining placement for arm and sampling operations. Linescans and rasters provide information on sample heterogeneity, and facilitate rapid analysis of layered rock exposures. The arm-mounted APXS is an improved version of its predecessors on MER. The sensitivity is increased by a factor of approximately 3, allowing a rapid analysis in 15 minutes and a full analysis with low detection limits in 3 hours. About 20 elements from Na to Y are determined for typical Martian materials. Bound water or light elements in excess of approximately 5 wt% can be inferred by the scatter peaks of the primary x-ray radiation. Good quality spectra can be taken at temperatures of up to -10 degrees C using the built-in Peltier cooler. The APXS has a high accuracy, only limited by microscopic heterogeneity, and an unprecedented precision to identify elemental trends and local anomalies. The approximately 1.7 cm sample diameter is close to the drill diameter, producing bulk analysis to support powder analysis with SAM and Chemin. APXS sample preparation utilizes the dust removal tool, and analyses are also performed on the drill fines. The complementary analyses from ChemCam and APXS allow efficient selection of the most promising samples for extensive analysis with Chemin and SAM and provide a comparison of the unprocessed sample with the processed powder for these instruments. Both will be used to perform chemostratigraphy studies at Gale to understand Mars' climate and geological history. The talk will report the first Curiosity rover results on the compositions of rocks and soils at Gale crater. JF - American Geophysical Union Fall Meeting AU - Wiens, R C AU - Gellert, R AU - Maurice, S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract U13A EP - 05 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620155?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Chemical+composition+of+rocks+and+soils+at+Gale+Crater%2C+Mars&rft.au=Wiens%2C+R+C%3BGellert%2C+R%3BMaurice%2C+S%3BAnonymous&rft.aulast=Wiens&rft.aufirst=R&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/U/sessions/U13A/abstracts/U13A-05 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Bentonite clay evolution at elevated pressures and temperatures; an experimental study for generic nuclear repositories AN - 1549620021; 2014-057202 AB - The Used Fuel Disposition Campaign is presently engaged in looking at various generic repository options for disposal of used fuel. Of interest are the disposal of high heat load canisters ,which may allow for a reduced repository footprint. The focus of this experimental work is to characterize Engineered Barrier Systems (EBS) conditions in repositories. Clay minerals--as backfill or buffer materials--are critical to the performance of the EBS. Experiments were performed in Dickson cells at 150 bar and sequentially stepped from 125 degrees C to 300 degrees C over a period of approximately 1 month. An unprocessed bentonite from Colony, Wyoming was used as the buffer material in each experiment. An K-Ca-Na-Cl-rich brine (replicating deep Stripa groundwater) was used at a 9:1 water:rock ratio. The baseline experiment contained brine+clay, while three other experiments contained metals that could be used as waste form canisters (brine+clay+304SS, brine+clay+316SS, brine+clay+Cu). All experiments were buffered at the Mt-Fe oxygen fugacity univarient line. As experiment temperature increased and time progressed, pH, K and Ca ion concentrations dropped, while Si, Na, and SO4 concentrations increased. Silicon was liberated into the fluid phase (>1000 ppm) and precipitated during the quenching of the experiment. The precipitated silica transformed to cristobalite as cooling progressed. Potassium was mobilized and exchanged with interlayer Na, transitioning the clay from Na-montmorillonite to K-smectite. Though illitization was not observed in these experiments, its formation may be kinetically limited and longer-term experiments are underway to evaluate the equilibrium point in this reaction. Clinoptilolite present in the starting bentonite mixture is unstable above 150 degrees C. Hence, the zeolite broke down at high temperatures but recrystallized as the quench event occurred. This was borne out in SEM images that showed clinoptilolite as a very late stage growth mineral. Both experimental runs containing steel exhibit the generation of a chlorite/Fe-saponite layer at the clay-metal boundary. The formation of minor amounts of pentlandite [(Fe,Ni)9S8] also occurs on both steel plates. Chalcocite (Cu2S) formed as a corrosion product on the Cu plates. The two sulfide phases have been produced by the generation of H2S gas during the experimental runs. The H2S is formed by the breakdown of pyrite framboids at high temperature in the bentonite. Such experiments on representative EBS materials at elevated P,T repository conditions are providing useful information for generic repository studies. Lack of illite formation is common in clay experiments and may be related to kinetics or K concentration. Precipitated SiO2 may potentially seal heating cracks in the clay backfill. The chlorite layer generated on steel may act as a passivation material and prevent corrosion of the steel canister wall. Finally, even if zeolites break down during the high temperature thermal pulse of a repository, zeolites may form again as the repository inventory cools off and perform as radionuclide sorbing phases. JF - American Geophysical Union Fall Meeting AU - Caporuscio, F A AU - Cheshire, M C AU - McCarney, M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V51A EP - 2768 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 01B:Mineralogy of silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620021?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Bentonite+clay+evolution+at+elevated+pressures+and+temperatures%3B+an+experimental+study+for+generic+nuclear+repositories&rft.au=Caporuscio%2C+F+A%3BCheshire%2C+M+C%3BMcCarney%2C+M%3BAnonymous&rft.aulast=Caporuscio&rft.aufirst=F&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Mesoscopic modeling of reactive transport processes AN - 1542645872; 2014-047639 AB - Reactive transport processes involving precipitation and/or dissolution are pervasive in geochemical, biological and engineered systems. Typical examples include self-assembled patterns such as Liesegang rings or bands, cones of stalactites in limestones caves, biofilm growth in aqueous environment, formation of mineral deposits in boilers and heat exchangers, uptake of toxic metal ions from polluted water by calcium carbonate, and mineral trapping of CO2. Compared to experimental studies, a numerical approach enables a systematic study of the reaction kinetics, mass transport, and mechanisms of nucleation and crystal growth, and hence provides a detailed description of reactive transport processes. In this study, we enhance a previously developed lattice Boltzmann pore-scale model by taking into account the nucleation process, and develop a mesoscopic approach to simulate reactive transport processes involving precipitation and/or dissolution of solid phases. The model is then used to simulate the formation of Liesegang precipitation patterns and investigate the effects of gel on the morphology of the precipitates. It is shown that this model can capture the porous structures of the precipitates and can account for the effects of the gel concentration and material. A wide range of precipitation patterns is predicted under different gel concentrations, including regular bands, treelike patterns, and for the first time with numerical models, transition patterns from regular bands to treelike patterns. The model is also applied to study the effect of secondary precipitate on the dissolution of primary mineral. Several types of dissolution and precipitation processes are identified based on the morphology and structures of the precipitates and on the extent to which the precipitates affect the dissolution of the primary mineral. Finally the model is applied to study the formation of pseudomorph. It is demonstrated for the first time by numerical simulation that a solution chemistry-driven interface-coupled dissolution-precipitation mechanism, combined with volume deficit, proper precipitation mechanism and low precipitation barrier on the surface of the primary phase is able to produce the pseudomorph. JF - American Geophysical Union Fall Meeting AU - Kang, Q AU - Chen, Lichen AU - Deng, Hailin AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V54A EP - 06 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542645872?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Mesoscopic+modeling+of+reactive+transport+processes&rft.au=Kang%2C+Q%3BChen%2C+Lichen%3BDeng%2C+Hailin%3BAnonymous&rft.aulast=Kang&rft.aufirst=Q&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Travel time approach to kinetically sorbing solute by diverging radial flows through heterogeneous porous formations AN - 1464884522; 2013-095551 AB - Diverging radial flow takes place in a heterogeneous porous medium where the log conductivity Y = ln K is modeled as a stationary random space function (RSF). The flow is steady, and is generated by a fully penetrating well. A linearly sorbing solute is injected through the well envelope, and we aim at computing the average flux concentration (breakthrough curve). A relatively simple solution for this difficult problem is achieved by adopting, similar to Indelman and Dagan (1999), a few simplifying assumptions: (i) a thick aquifer of large horizontal extent, (ii) mildly heterogeneous medium, (iii) strongly anisotropic formation, and (iv) large Peclet number. By introducing an appropriate Lagrangian framework, three-dimensional transport is mapped onto a one-dimensional domain (tau , t) where tau and t represent the fluid travel and current time, respectively. Central for this approach is the probability density function of the RSF tau that is derived consistently with the adopted assumptions stated above. Based on this, it is shown that the travel time can be regarded as a Gaussian random variable only in the far field. The breakthrough curves are analyzed to assess the impact of the hydraulic as well as reactive parameters. Finally, the travel time approach is tested against a forced-gradient transport experiment and shows good agreement. Abstract Copyright (2012), . American Geophysical Union. All Rights Reserved. JF - Water Resources Research AU - Severino, Gerardo AU - De Bartolo, Samuele AU - Toraldo, Gerardo AU - Srinivasan, Gowri AU - Viswanathan, Hari Y1 - 2012/12// PY - 2012 DA - December 2012 SP - 10 PB - American Geophysical Union, Washington, DC VL - 48 IS - 12 SN - 0043-1397, 0043-1397 KW - solute transport KW - sorption KW - porous materials KW - mathematical models KW - equations KW - ground water KW - heterogeneous materials KW - transport KW - radial flow KW - mathematical methods KW - velocity KW - theoretical models KW - hydraulic conductivity KW - breakthrough curves KW - kinetics KW - Peclet number KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464884522?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Travel+time+approach+to+kinetically+sorbing+solute+by+diverging+radial+flows+through+heterogeneous+porous+formations&rft.au=Severino%2C+Gerardo%3BDe+Bartolo%2C+Samuele%3BToraldo%2C+Gerardo%3BSrinivasan%2C+Gowri%3BViswanathan%2C+Hari&rft.aulast=Severino&rft.aufirst=Gerardo&rft.date=2012-12-01&rft.volume=48&rft.issue=12&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1029%2F2012WR012608 L2 - http://www.agu.org/journals/wr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 34 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2013-12-05 N1 - CODEN - WRERAQ N1 - SubjectsTermNotLitGenreText - breakthrough curves; equations; ground water; heterogeneous materials; hydraulic conductivity; kinetics; mathematical methods; mathematical models; Peclet number; porous materials; radial flow; solute transport; sorption; theoretical models; transport; velocity DO - http://dx.doi.org/10.1029/2012WR012608 ER - TY - JOUR T1 - Effect of transport-pathway simplifications on projected releases of radionuclides from a nuclear waste repository (Sweden) AN - 1312835091; 2013-023321 AB - The Swedish Nuclear Fuel and Waste Management Company has recently submitted an application for a license to construct a final repository for spent nuclear fuel, at approximately 500 m depth in crystalline bedrock. Migration pathways through the geosphere barrier are geometrically complex, with segments in fractured rock, deformation zones, backfilled tunnels, and near-surface soils. Several simplifications of these complex migration pathways were used in the assessments of repository performance that supported the license application. Specifically, in the geosphere transport calculations, radionuclide transport in soils and tunnels was neglected, and deformation zones were assumed to have transport characteristics of fractured rock. The effects of these simplifications on the projected performance of the geosphere barrier system are addressed. Geosphere performance is shown to be sensitive to how transport characteristics of deformation zones are conceptualized and incorporated into the model. Incorporation of advective groundwater travel time within backfilled tunnels reduces radiological dose from non-sorbing radionuclides such as I-129, while sorption in near-surface soils reduces radiological doses from sorbing radionuclides such as Ra-226. These results help quantify the degree to which geosphere performance was pessimistically assessed, and provide some guidance on how future studies to reduce uncertainty in geosphere performance may be focused. Copyright 2012 Springer-Verlag Berlin Heidelberg and Springer-Verlag (outside the USA) JF - Hydrogeology Journal AU - Selroos, Jan-Olof AU - Painter, Scott L Y1 - 2012/12// PY - 2012 DA - December 2012 SP - 1467 EP - 1481 PB - Springer, Berlin - Heidelberg VL - 20 IS - 8 SN - 1431-2174, 1431-2174 KW - isotopes KW - halogens KW - waste disposal sites KW - reinforced materials KW - Europe KW - preferential flow KW - rock mechanics KW - radioactive waste KW - Ra-226 KW - iodine KW - fractures KW - radioactive isotopes KW - I-129 KW - Uppsala Sweden KW - transport KW - sensitivity analysis KW - tunnels KW - crystalline rocks KW - soils KW - bedrock KW - high-level waste KW - alkaline earth metals KW - Western Europe KW - radium KW - pollution KW - migration of elements KW - deformation KW - preventive measures KW - Forsmark Sweden KW - models KW - Scandinavia KW - metals KW - waste disposal KW - underground disposal KW - Sweden KW - 30:Engineering geology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312835091?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Hydrogeology+Journal&rft.atitle=Effect+of+transport-pathway+simplifications+on+projected+releases+of+radionuclides+from+a+nuclear+waste+repository+%28Sweden%29&rft.au=Selroos%2C+Jan-Olof%3BPainter%2C+Scott+L&rft.aulast=Selroos&rft.aufirst=Jan-Olof&rft.date=2012-12-01&rft.volume=20&rft.issue=8&rft.spage=1467&rft.isbn=&rft.btitle=&rft.title=Hydrogeology+Journal&rft.issn=14312174&rft_id=info:doi/10.1007%2Fs10040-012-0888-5 L2 - http://www.springerlink.com/content/102028/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2013-01-01 N1 - Number of references - 26 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2013-07-18 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; bedrock; crystalline rocks; deformation; Europe; Forsmark Sweden; fractures; halogens; high-level waste; I-129; iodine; isotopes; metals; migration of elements; models; pollution; preferential flow; preventive measures; Ra-226; radioactive isotopes; radioactive waste; radium; reinforced materials; rock mechanics; Scandinavia; sensitivity analysis; soils; Sweden; transport; tunnels; underground disposal; Uppsala Sweden; waste disposal; waste disposal sites; Western Europe DO - http://dx.doi.org/10.1007/s10040-012-0888-5 ER - TY - JOUR T1 - Dryland biological soil crust cyanobacteria show unexpected decreases in abundance under long-term elevated CO2 AN - 1257784173; 17459032 AB - Biological soil crusts (biocrusts) cover soil surfaces in many drylands globally. The impacts of 10 years of elevated atmospheric CO2 on the cyanobacteria in biocrusts of an arid shrubland were examined at a large manipulated experiment in Nevada, USA. Cyanobacteria-specific quantitative PCR surveys of cyanobacteria small-subunit (SSU) rRNA genes suggested a reduction in biocrust cyanobacterial biomass in the elevated CO2 treatment relative to the ambient controls. Additionally, SSU rRNA gene libraries and shotgun metagenomes showed reduced representation of cyanobacteria in the total microbial community. Taxonomic composition of the cyanobacteria was similar under ambient and elevated CO2 conditions, indicating the decline was manifest across multiple cyanobacterial lineages. Recruitment of cyanobacteria sequences from replicate shotgun metagenomes to cyanobacterial genomes representing major biocrust orders also suggested decreased abundance of cyanobacteria sequences across the majority of genomes tested. Functional assignment of cyanobacteria-related shotgun metagenome sequences indicated that four subsystem categories, three related to oxidative stress, were differentially abundant in relation to the elevated CO2 treatment. Taken together, these results suggest that elevated CO2 affected a generalized decrease in cyanobacteria in the biocrusts and may have favoured cyanobacteria with altered gene inventories for coping with oxidative stress. JF - Environmental Microbiology AU - Steven, Blaire AU - Gallegos-Graves, La Verne AU - Yeager, Chris M AU - Belnap, Jayne AU - Evans, RDavid AU - Kuske, Cheryl R AD - Bioscience Division. Los Alamos National Laboratory Y1 - 2012/12// PY - 2012 DA - December 2012 SP - 3247 EP - 3258 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 14 IS - 12 SN - 1462-2912, 1462-2912 KW - Microbiology Abstracts B: Bacteriology; Microbiology Abstracts C: Algology, Mycology & Protozoology; ASFA 1: Biological Sciences & Living Resources; Microbiology Abstracts A: Industrial & Applied Microbiology KW - Genomes KW - Inventories KW - Nucleotide sequence KW - Abundance KW - Recruitment KW - Phytoplankton KW - USA, Nevada KW - Biomass KW - Population dynamics KW - Soil KW - rRNA KW - Cyanobacteria KW - Oxidative stress KW - Microbiology KW - Polymerase chain reaction KW - Carbon dioxide KW - J 02310:Genetics & Taxonomy KW - Q1 08442:Population dynamics KW - A 01400:Soil Microbes KW - K 03310:Genetics & Taxonomy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1257784173?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Microbiology&rft.atitle=Dryland+biological+soil+crust+cyanobacteria+show+unexpected+decreases+in+abundance+under+long-term+elevated+CO2&rft.au=Steven%2C+Blaire%3BGallegos-Graves%2C+La+Verne%3BYeager%2C+Chris+M%3BBelnap%2C+Jayne%3BEvans%2C+RDavid%3BKuske%2C+Cheryl+R&rft.aulast=Steven&rft.aufirst=Blaire&rft.date=2012-12-01&rft.volume=14&rft.issue=12&rft.spage=3247&rft.isbn=&rft.btitle=&rft.title=Environmental+Microbiology&rft.issn=14622912&rft_id=info:doi/10.1111%2F1462-2920.12011 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-12-01 N1 - Last updated - 2016-02-18 N1 - SubjectsTermNotLitGenreText - Genomes; Cyanobacteria; Nucleotide sequence; Recruitment; Microbiology; Phytoplankton; Population dynamics; Carbon dioxide; Soil; Inventories; rRNA; Oxidative stress; Abundance; Polymerase chain reaction; Biomass; USA, Nevada DO - http://dx.doi.org/10.1111/1462-2920.12011 ER - TY - JOUR T1 - A hybrid Laplace transform finite analytic method for solving transport problems with large Peclet and Courant numbers AN - 1244683778; 2013-008533 AB - In this study, the authors develop a hybrid Laplace transform finite analytic method (LTFAM) to solve the advection-dispersion equations with large Peclet and Courant numbers. The finite analytic method with a hybrid Laplace transform can incorporate the temporal variable into the numerical scheme and effectively control the numerical dispersion and oscillation at solute sharp fronts. Since the conventional numerical methods use a large amount of time steps to iterate to the specified time, they may lead to an accumulation of computation errors from each iteration step. Instead of using many fine time steps to satisfy the condition of Courant numbers less than 1 for the conventional numerical methods, the LTFAM algorithm uses a one-step approach to compute the solute concentrations at any specified time with stable numerical solutions. The derived LTFAM algorithm is verified with two numerical simulation examples against the analytical solutions. The numerical results of the LTFAM match the analytical solutions very well, especially for solute transport in the advection-dominated cases. The developed algorithm in this paper can save a large amount of simulating time and improve the computational accuracy. Furthermore, because the solutions of the LTFAM for a set of specified times can be obtained separately in the Laplace space, independence of each time step implies that the LTFAM is well-suited for executing on high performance parallel computers. This algorithm facilitates the long-term predictions of contaminant transport in the kilometer-scale field sites. Abstract Copyright (2012) Elsevier, B.V. JF - Computers & Geosciences AU - Wang, Wenke AU - Dai, Zhenxue AU - Li, Junting AU - Zhou, Liling Y1 - 2012/12// PY - 2012 DA - December 2012 SP - 182 EP - 189 PB - Elsevier, Amsterdam VL - 49 SN - 0098-3004, 0098-3004 KW - solute transport KW - numerical analysis KW - data processing KW - prediction KW - pollution KW - mathematical models KW - calibration KW - advection KW - simulation KW - Laplace transformations KW - models KW - computer programs KW - transport KW - mathematical methods KW - algorithms KW - Courant number KW - accuracy KW - Peclet number KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244683778?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Geosciences&rft.atitle=A+hybrid+Laplace+transform+finite+analytic+method+for+solving+transport+problems+with+large+Peclet+and+Courant+numbers&rft.au=Wang%2C+Wenke%3BDai%2C+Zhenxue%3BLi%2C+Junting%3BZhou%2C+Liling&rft.aulast=Wang&rft.aufirst=Wenke&rft.date=2012-12-01&rft.volume=49&rft.issue=&rft.spage=182&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Geosciences&rft.issn=00983004&rft_id=info:doi/10.1016%2Fj.cageo.2012.05.020 L2 - http://www.sciencedirect.com/science?_ob=JournalURL&_cdi=5840&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=e5198452fad934c6346f38b57511c8e0 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 46 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-12-27 N1 - CODEN - GGEOD5 N1 - SubjectsTermNotLitGenreText - accuracy; advection; algorithms; calibration; computer programs; Courant number; data processing; Laplace transformations; mathematical methods; mathematical models; models; numerical analysis; Peclet number; pollution; prediction; simulation; solute transport; transport DO - http://dx.doi.org/10.1016/j.cageo.2012.05.020 ER - TY - JOUR T1 - Adaptive hybrid optimization strategy for calibration and parameter estimation of physical process models AN - 1244674423; 2013-008515 AB - A new adaptive hybrid optimization strategy, entitled squads, is proposed for complex inverse analysis of computationally intensive physics-based models. Typically, models are calibrated and model parameters are estimated by minimization of the discrepancy between model simulations characterizing the system and existing observations requiring a substantial number of model evaluations. Squads is designed to be computationally efficient and robust in identification of the global optimum (i.e. maximum or minimum value of an objective function). It integrates global and local optimization using Adaptive Particle Swarm Optimization (APSO) and Levenberg-Marquardt (LM) optimization using adaptive rules based on runtime performance. The global strategy (APSO) optimizes the location of a set of solutions (particles) in the parameter space. The local strategy (LM) is applied only to a subset of the particles at different stages of the optimization based on the adaptive rules. After the LM adjustment of the subset of particle positions, the updated particles are returned to APSO. Therefore, squads is a global strategy that utilizes a local optimization speedup. The advantages of coupling APSO and LM in the manner implemented in squads is demonstrated by comparisons of squads performance against Levenberg-Marquardt (LM), Particle Swarm Optimization (PSO), Adaptive Particle Swarm Optimization (APSO; i.e. TRIBES), and an existing hybrid optimization strategy (hPSO). All the strategies are tested on 2D, 5D and 10D Rosenbrock and Griewank polynomial test functions and a synthetic hydrogeologic application to identify the source of a contaminant plume in an aquifer. Tests are performed using a series of runs with random initial guesses for the estimated parameters. The performance of the strategies are compared based on their robustness, defined as the percentage of runs that identify the global optimum, and their efficiency, quantified by a statistical representation of the number of function evaluations performed prior to identification of the global optimum. Squads is observed to have better performance than the other strategies for the test functions and the hydrogeologic application when both robustness and efficiency are taken into consideration. Abstract Copyright (2012) Elsevier, B.V. JF - Computers & Geosciences AU - Vesselinov, Velimir V AU - Harp, Dylan R Y1 - 2012/12// PY - 2012 DA - December 2012 SP - 10 EP - 20 PB - Elsevier, Amsterdam VL - 49 SN - 0098-3004, 0098-3004 KW - processes KW - hydrology KW - functions KW - statistical analysis KW - data processing KW - pollution KW - optimization KW - inverse problem KW - calibration KW - models KW - squads method KW - mathematical methods KW - Griewank function KW - Rosenbrock function KW - applications KW - 15:Miscellaneous UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244674423?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Geosciences&rft.atitle=Adaptive+hybrid+optimization+strategy+for+calibration+and+parameter+estimation+of+physical+process+models&rft.au=Vesselinov%2C+Velimir+V%3BHarp%2C+Dylan+R&rft.aulast=Vesselinov&rft.aufirst=Velimir&rft.date=2012-12-01&rft.volume=49&rft.issue=&rft.spage=10&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Geosciences&rft.issn=00983004&rft_id=info:doi/10.1016%2Fj.cageo.2012.05.027 L2 - http://www.sciencedirect.com/science?_ob=JournalURL&_cdi=5840&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=e5198452fad934c6346f38b57511c8e0 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 57 N1 - Document feature - illus. incl. 4 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-12-27 N1 - CODEN - GGEOD5 N1 - SubjectsTermNotLitGenreText - applications; calibration; data processing; functions; Griewank function; hydrology; inverse problem; mathematical methods; models; optimization; pollution; processes; Rosenbrock function; squads method; statistical analysis DO - http://dx.doi.org/10.1016/j.cageo.2012.05.027 ER - TY - JOUR T1 - Multiexciton dynamics in infrared-emitting colloidal nanostructures probed by a superconducting nanowire single-photon detector. AN - 1220572667; 23020520 AB - Carrier multiplication (CM) is the process in which absorption of a single photon produces multiple electron-hole pairs. Here, we evaluate the effect of particle shape on CM efficiency by conducting a comparative study of spherical nanocrystal quantum dots (NQDs) and elongated nanorods (NRs) of PbSe using a time-resolved technique that is based on photon counting in the infrared using a superconducting nanowire single-photon photodetector (SNSPD). Due to its high sensitivity and low noise levels, this technique allows for accurate determination of CM yields, even with the small excitation intensities required for quantitative measurements, and the fairly low emission quantum yields of elongated NR samples. Our measurements indicate an up to ∼60% increase in multiexciton yields in NRs versus NQDs, which is attributed primarily to a decrease in the electron-hole pair creation energy. These findings suggest that shape control is a promising approach for enhancing the CM process. Further, our work demonstrates the effectiveness of the SNSPD technique for the rapid screening of CM performance in infrared nanomaterials. JF - ACS nano AU - Sandberg, Richard L AU - Padilha, Lazaro A AU - Qazilbash, Muhammad M AU - Bae, Wan Ki AU - Schaller, Richard D AU - Pietryga, Jeffrey M AU - Stevens, Martin J AU - Baek, Burm AU - Nam, Sae Woo AU - Klimov, Victor I AD - Center for Advanced Solar Photophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States. Y1 - 2012/11/27/ PY - 2012 DA - 2012 Nov 27 SP - 9532 EP - 9540 VL - 6 IS - 11 KW - Colloids KW - 0 KW - Index Medicus KW - Equipment Design KW - Colloids -- chemistry KW - Infrared Rays KW - Equipment Failure Analysis KW - Electric Conductivity KW - Nanotubes -- chemistry KW - Conductometry -- instrumentation KW - Quantum Dots KW - Photometry -- instrumentation KW - Nanotechnology -- instrumentation KW - Nanotubes -- radiation effects UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220572667?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=ACS+nano&rft.atitle=Multiexciton+dynamics+in+infrared-emitting+colloidal+nanostructures+probed+by+a+superconducting+nanowire+single-photon+detector.&rft.au=Sandberg%2C+Richard+L%3BPadilha%2C+Lazaro+A%3BQazilbash%2C+Muhammad+M%3BBae%2C+Wan+Ki%3BSchaller%2C+Richard+D%3BPietryga%2C+Jeffrey+M%3BStevens%2C+Martin+J%3BBaek%2C+Burm%3BNam%2C+Sae+Woo%3BKlimov%2C+Victor+I&rft.aulast=Sandberg&rft.aufirst=Richard&rft.date=2012-11-27&rft.volume=6&rft.issue=11&rft.spage=9532&rft.isbn=&rft.btitle=&rft.title=ACS+nano&rft.issn=1936-086X&rft_id=info:doi/10.1021%2Fnn3043226 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2013-05-16 N1 - Date created - 2012-11-27 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/nn3043226 ER - TY - JOUR T1 - Nitrogen-doped graphene-rich catalysts derived from heteroatom polymers for oxygen reduction in nonaqueous lithium-O2 battery cathodes. AN - 1220569897; 23036092 AB - In this work, we present a synthesis approach for nitrogen-doped graphene-sheet-like nanostructures via the graphitization of a heteroatom polymer, in particular, polyaniline, under the catalysis of a cobalt species using multiwalled carbon nanotubes (MWNTs) as a supporting template. The graphene-rich composite catalysts (Co-N-MWNTs) exhibit substantially improved activity for oxygen reduction in nonaqueous lithium-ion electrolyte as compared to those of currently used carbon blacks and Pt/carbon catalysts, evidenced by both rotating disk electrode and Li-O(2) battery experiments. The synthesis-structure-activity correlations for the graphene nanostructures were explored by tuning their synthetic chemistry (support, nitrogen precursor, heating temperature, and transition metal type and content) to investigate how the resulting morphology and nitrogen-doping functionalities (e.g., pyridinic, pyrrolic, and quaternary) influence the catalyst activity. In particular, an optimal temperature for heat treatment during synthesis is critical to creating a high-surface-area catalyst with favorable nitrogen doping. The sole Co phase, Co(9)S(8), was present in the catalyst but plays a negligible role in ORR. Nevertheless, the addition of Co species in the synthesis is indispensable for achieving high activity, due to its effects on the final catalyst morphology and structure, including surface area, nitrogen doping, and graphene formation. This new route for the preparation of a nitrogen-doped graphene nanocomposite with carbon nanotube offers synthetic control of morphology and nitrogen functionality and shows promise for applications in nonaqueous oxygen reduction electrocatalysis for Li-O(2) battery cathodes. JF - ACS nano AU - Wu, Gang AU - Mack, Nathan H AU - Gao, Wei AU - Ma, Shuguo AU - Zhong, Ruiqin AU - Han, Jiantao AU - Baldwin, Jon K AU - Zelenay, Piotr AD - Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States. wugang@lanl.gov Y1 - 2012/11/27/ PY - 2012 DA - 2012 Nov 27 SP - 9764 EP - 9776 VL - 6 IS - 11 KW - Polymers KW - 0 KW - Water KW - 059QF0KO0R KW - Graphite KW - 7782-42-5 KW - Lithium KW - 9FN79X2M3F KW - Nitrogen KW - N762921K75 KW - Oxygen KW - S88TT14065 KW - Index Medicus KW - Oxidation-Reduction KW - Equipment Design KW - Equipment Failure Analysis KW - Water -- chemistry KW - Catalysis KW - Nitrogen -- chemistry KW - Electric Power Supplies KW - Electrodes KW - Lithium -- chemistry KW - Oxygen -- chemistry KW - Graphite -- chemistry KW - Polymers -- chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220569897?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=ACS+nano&rft.atitle=Nitrogen-doped+graphene-rich+catalysts+derived+from+heteroatom+polymers+for+oxygen+reduction+in+nonaqueous+lithium-O2+battery+cathodes.&rft.au=Wu%2C+Gang%3BMack%2C+Nathan+H%3BGao%2C+Wei%3BMa%2C+Shuguo%3BZhong%2C+Ruiqin%3BHan%2C+Jiantao%3BBaldwin%2C+Jon+K%3BZelenay%2C+Piotr&rft.aulast=Wu&rft.aufirst=Gang&rft.date=2012-11-27&rft.volume=6&rft.issue=11&rft.spage=9764&rft.isbn=&rft.btitle=&rft.title=ACS+nano&rft.issn=1936-086X&rft_id=info:doi/10.1021%2Fnn303275d LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2013-05-16 N1 - Date created - 2012-11-27 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/nn303275d ER - TY - JOUR T1 - Molecular environment of stable iodine and radioiodine ( (super 129) I) in natural organic matter; evidence inferred from NMR and binding experiments at environmentally relevant concentrations AN - 1282821203; 2013-013741 AB - (super 129) I is a major by-product of nuclear fission and had become one of the major radiation risk drivers at Department of Energy (DOE) sites. (super 129) I is present at elevated levels in the surface soils of the Savannah River Site (SRS) F-Area and was found to be bound predominantly to soil organic matter (SOM). Naturally bound (super 127) I and (super 129) I to sequentially extracted humic acids (HAs), fulvic acids (FAs) and a water extractable colloid (WEC) were measured in a (super 129) I-contaminated wetland surface soil located on the SRS. WEC is a predominantly colloidal organic fraction obtained from soil re-suspension experiments to mimic the fraction that may be released during groundwater exfiltration, storm water or surface runoff events. For the first time, NMR techniques were applied to infer the molecular environment of naturally occurring stable iodine and radioiodine binding to SOM. Iodine uptake partitioning coefficients (K (sub d) ) by these SOM samples at ambient iodine concentrations were also measured and related to quantitative structural analyses by (super 13) C DPMAS NMR and solution state (super 1) H NMR on the eight humic acid fractions. By assessing the molecular environment of iodine, it was found that it was closely associated with the aromatic regions containing esterified products of phenolic and formic acids or other aliphatic carboxylic acids, amide functionalities, quinone-like structures activated by electron-donating groups (e.g., NH (sub 2) ), or a hemicellulose-lignin-like complex with phenyl-glycosidic linkages. However, FAs and WEC contained much greater concentrations of (super 127) I or (super 129) I than HAs. The contrasting radioiodine contents among the three different types of SOM (HAs, FAs and WEC) suggest that the iodine binding environment cannot be explained solely by the difference in the amount of their reactive binding sites. Instead, indirect evidence indicates that the macro-molecular conformation, such as the hydrophobic aliphatic periphery hindering the active aromatic cores and the hydrophilic polysaccharides favoring the access by hydrophilic iodine species, also influences iodine-SOM interactions. Abstract Copyright (2012) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Xu, Chen AU - Zhong, Junyan AU - Hatcher, Patrick G AU - Zhang, Saijin AU - Li, Hsiu-Ping AU - Ho, Yi-Fang AU - Schwehr, Kathleen A AU - Kaplan, Daniel I AU - Roberts, Kimberly A AU - Brinkmeyer, Robin AU - Yeager, Chris M AU - Santschi, Peter H Y1 - 2012/11/15/ PY - 2012 DA - 2012 Nov 15 SP - 166 EP - 182 PB - Elsevier, New York, NY VL - 97 SN - 0016-7037, 0016-7037 KW - United States KW - South Carolina KW - isotopes KW - halogens KW - stormwater KW - humic acids KW - environmental analysis KW - NMR spectra KW - ground water KW - iodine KW - radioactive isotopes KW - I-129 KW - I-127 KW - spectra KW - chemical composition KW - water pollution KW - fission KW - experimental studies KW - colloidal materials KW - pollutants KW - biochemistry KW - statistical analysis KW - pollution KW - MAS NMR spectra KW - organic compounds KW - organic acids KW - humic substances KW - soil pollution KW - infiltration KW - runoff KW - risk assessment KW - Savannah River Site KW - public health KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282821203?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Molecular+environment+of+stable+iodine+and+radioiodine+%28+%28super+129%29+I%29+in+natural+organic+matter%3B+evidence+inferred+from+NMR+and+binding+experiments+at+environmentally+relevant+concentrations&rft.au=Xu%2C+Chen%3BZhong%2C+Junyan%3BHatcher%2C+Patrick+G%3BZhang%2C+Saijin%3BLi%2C+Hsiu-Ping%3BHo%2C+Yi-Fang%3BSchwehr%2C+Kathleen+A%3BKaplan%2C+Daniel+I%3BRoberts%2C+Kimberly+A%3BBrinkmeyer%2C+Robin%3BYeager%2C+Chris+M%3BSantschi%2C+Peter+H&rft.aulast=Xu&rft.aufirst=Chen&rft.date=2012-11-15&rft.volume=97&rft.issue=&rft.spage=166&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2012.08.030 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 44 N1 - PubXState - NY N1 - Document feature - illus. incl. 6 tables, sketch map N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-02-05 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - biochemistry; chemical composition; colloidal materials; environmental analysis; experimental studies; fission; ground water; halogens; humic acids; humic substances; I-127; I-129; infiltration; iodine; isotopes; MAS NMR spectra; NMR spectra; organic acids; organic compounds; pollutants; pollution; public health; radioactive isotopes; risk assessment; runoff; Savannah River Site; soil pollution; South Carolina; spectra; statistical analysis; stormwater; United States; water pollution DO - http://dx.doi.org/10.1016/j.gca.2012.08.030 ER - TY - CPAPER T1 - Damage & Fracture in High Explosive PBX 9502 Subject to Compression T2 - 2012 ASME International Mechanical Engineering Congress & Exposition AN - 1313082368; 6173191 JF - 2012 ASME International Mechanical Engineering Congress & Exposition AU - Liu, Cheng Y1 - 2012/11/09/ PY - 2012 DA - 2012 Nov 09 KW - Explosives KW - Fractures KW - Compression UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313082368?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.atitle=Damage+%26amp%3B+Fracture+in+High+Explosive+PBX+9502+Subject+to+Compression&rft.au=Liu%2C+Cheng&rft.aulast=Liu&rft.aufirst=Cheng&rft.date=2012-11-09&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.issn=&rft_id=info:doi/ L2 - http://www.asmeconferences.org/Congress2012/ConferenceSchedule.cfm LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Modeling coupled Thermo-Hydro-Mechanical processes including plastic deformation in geological porous media T2 - 2012 ASME International Mechanical Engineering Congress & Exposition AN - 1313041597; 6172126 JF - 2012 ASME International Mechanical Engineering Congress & Exposition AU - Karra, Satish AU - Kelkar, Sharad AU - Pawar, Rajesh AU - Zyvoloski, George Y1 - 2012/11/09/ PY - 2012 DA - 2012 Nov 09 KW - Geology KW - Deformation KW - Plastics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313041597?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.atitle=Modeling+coupled+Thermo-Hydro-Mechanical+processes+including+plastic+deformation+in+geological+porous+media&rft.au=Karra%2C+Satish%3BKelkar%2C+Sharad%3BPawar%2C+Rajesh%3BZyvoloski%2C+George&rft.aulast=Karra&rft.aufirst=Satish&rft.date=2012-11-09&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.issn=&rft_id=info:doi/ L2 - http://www.asmeconferences.org/Congress2012/ConferenceSchedule.cfm LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Simulations of the Tilted Rig Experiment using the xRAGE and FLAG Hydrocodes T2 - 2012 ASME International Mechanical Engineering Congress & Exposition AN - 1313025651; 6171802 JF - 2012 ASME International Mechanical Engineering Congress & Exposition AU - Rollin, Bertrand AU - Denissen, Nicholas AU - Reisner, Jon AU - Andrews, Malcolm Y1 - 2012/11/09/ PY - 2012 DA - 2012 Nov 09 KW - Simulation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313025651?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.atitle=Simulations+of+the+Tilted+Rig+Experiment+using+the+xRAGE+and+FLAG+Hydrocodes&rft.au=Rollin%2C+Bertrand%3BDenissen%2C+Nicholas%3BReisner%2C+Jon%3BAndrews%2C+Malcolm&rft.aulast=Rollin&rft.aufirst=Bertrand&rft.date=2012-11-09&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.issn=&rft_id=info:doi/ L2 - http://www.asmeconferences.org/Congress2012/ConferenceSchedule.cfm LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Biogeochemistry of Uranium in High Ionic-Strength Brine T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313116103; 6175095 JF - 2012 Annual Meeting of the Geological Society of America AU - Reed, Donald AU - Swanson, Juliet AU - Lucchini, Jean AU - Richmann, Michael Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Biogeochemistry KW - Uranium KW - Biogeochemical cycle KW - Brines UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313116103?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=Biogeochemistry+of+Uranium+in+High+Ionic-Strength+Brine&rft.au=Reed%2C+Donald%3BSwanson%2C+Juliet%3BLucchini%2C+Jean%3BRichmann%2C+Michael&rft.aulast=Reed&rft.aufirst=Donald&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - The Chemcam Investigation: Compositions at the Curiosity Rover Landing Site T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313103825; 6174835 JF - 2012 Annual Meeting of the Geological Society of America AU - Wiens, Roger AU - Maurice, Sylvestre Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Landing statistics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313103825?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=The+Chemcam+Investigation%3A+Compositions+at+the+Curiosity+Rover+Landing+Site&rft.au=Wiens%2C+Roger%3BMaurice%2C+Sylvestre&rft.aulast=Wiens&rft.aufirst=Roger&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Analytical and numerical models of hydrothermal fluid flow at fault intersections AN - 1660631458; 2015-018513 AB - Fault intersections are the locus of hot spring activity and Carlin-type gold mineralization within the Basin and Range, USA. Analytical and numerical solutions to Stokes equation suggest that peak fluid velocities at fault intersections increase between 20% and 47% when fracture apertures have identical widths but increase by only about 1% and 8% when aperture widths vary by a factor of 2. This suggests that fault zone intersections must have enlarged apertures. Three-dimensional finite element models that consider intersecting 10- to 20-m wide fault planes resulted in hot spring activity being preferentially located at fault zone intersections when fault zones were assigned identical permeabilities. We found that the onset of convection at the intersections of the fault zones occurred in our hydrothermal model over a narrow permeability range between 5X10 (super -13) and 7X10 (super -13) m (super 2) . Relatively high vertical fluid velocities (0.3-3 m year (super -1) ) extended away from the fault intersections for about 0.5-1.5 km. For the boundary conditions and fault plane dimensions used, peak discharge temperatures of 112 degrees C at the water table occurred with an intermediate fault zone permeability of 5X10 (super -13) m (super 2) . When fault plane permeability differed by a factor of 2 or more, the locus of hot spring activity shifted away from the intersections. However, increasing the permeability at the core of the fault plane intersection by 40% shifted the discharge back to the intersections. When aquifer units were assigned a permeability value equal to those of the fault planes, convective rolls developed that extend about 3 km laterally along the fault plane and into the adjacent aquifer. JF - Geofluids (Oxford) AU - Person, M AU - Hofstra, A AU - Sweetkind, D AU - Stone, W AU - Cohen, D AU - Gable, C W AU - Banerjee, A Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 312 EP - 326 PB - Wiley-Blackwell, Oxford VL - 12 IS - 4 SN - 1468-8115, 1468-8115 KW - United States KW - Basin and Range Province KW - Beowawe hydrothermal field KW - preferential flow KW - ground water KW - fractures KW - finite element analysis KW - fault planes KW - velocity KW - springs KW - mineralization KW - gold ores KW - Nevada KW - faults KW - North America KW - numerical models KW - three-dimensional models KW - carlin-type deposits KW - fluid flow KW - Gold Bar mining district KW - thermal waters KW - hydrothermal conditions KW - geometry KW - aquifers KW - water table KW - Rayleigh number KW - hydrostratigraphy KW - Navier-Stokes equations KW - metal ores KW - hot springs KW - permeability KW - fault zones KW - 27A:Economic geology, geology of ore deposits KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660631458?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geofluids+%28Oxford%29&rft.atitle=Analytical+and+numerical+models+of+hydrothermal+fluid+flow+at+fault+intersections&rft.au=Person%2C+M%3BHofstra%2C+A%3BSweetkind%2C+D%3BStone%2C+W%3BCohen%2C+D%3BGable%2C+C+W%3BBanerjee%2C+A&rft.aulast=Person&rft.aufirst=M&rft.date=2012-11-01&rft.volume=12&rft.issue=4&rft.spage=312&rft.isbn=&rft.btitle=&rft.title=Geofluids+%28Oxford%29&rft.issn=14688115&rft_id=info:doi/10.1111%2Fgfl.12002 L2 - http://www.blackwellpublishing.com/journal.asp?ref=1468-8115 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2015-01-01 N1 - Number of references - 62 N1 - Document feature - illus. incl. 3 tables, geol. sketch maps N1 - SuppNotes - Includes appendices N1 - Last updated - 2015-03-05 N1 - SubjectsTermNotLitGenreText - aquifers; Basin and Range Province; Beowawe hydrothermal field; carlin-type deposits; fault planes; fault zones; faults; finite element analysis; fluid flow; fractures; geometry; Gold Bar mining district; gold ores; ground water; hot springs; hydrostratigraphy; hydrothermal conditions; metal ores; mineralization; Navier-Stokes equations; Nevada; North America; numerical models; permeability; preferential flow; Rayleigh number; springs; thermal waters; three-dimensional models; United States; velocity; water table DO - http://dx.doi.org/10.1111/gfl.12002 ER - TY - JOUR T1 - Comparisons of dynamic triggering near Beijing, China following recent large earthquakes in Sumatra AN - 1542645723; 2014-048213 AB - Dynamic triggering around the Fangshan Pluton near Beijing is repeatedly identified. Here we report clear triggered events in this region during the surface waves of the 2012 Mw8.6 Sumatra earthquake. However, we do not find any triggered events during the G2 waves of the Mw8.6 event, and the surface waves of the Mw8.2 Sumatra earthquake that occurred two hours later. The peak ground velocities of the 2012 Mw8.2 event are around the apparent triggering threshold of 0.1-0.2 cm/s in this region. Hence, the fact that this event did not trigger does not require an influence of elapsed time since last trigger (the Mw8.6 mainshock), but is consistent with it. The lack of triggering during the G2 wave of the 2012 Mw8.6 mainshock may be caused by relatively weak surface-wave signals in the intermediate period of 100-10 s. Abstract Copyright This paper is not subject to U.S. copyright. Published in 2012 by the American Geophysical Union. JF - Geophysical Research Letters AU - Wu, Jing AU - Peng, Zhigang AU - Wang, Weijun AU - Gong, Xuan AU - Chen, Qifu AU - Wu, Chunquan Y1 - 2012/11// PY - 2012 DA - November 2012 EP - L21310 PB - American Geophysical Union, Washington, DC VL - 39 IS - 21 SN - 0094-8276, 0094-8276 KW - plutons KW - precursors KW - Far East KW - Indonesia KW - continental crust KW - Fangshan Intrusion KW - intrusions KW - Sumatra KW - seismicity KW - great earthquakes KW - Sumatra earthquake 2012 KW - Hebei China KW - Beijing China KW - tectonics KW - Asia KW - earthquakes KW - seismotectonics KW - crust KW - China KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542645723?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Comparisons+of+dynamic+triggering+near+Beijing%2C+China+following+recent+large+earthquakes+in+Sumatra&rft.au=Wu%2C+Jing%3BPeng%2C+Zhigang%3BWang%2C+Weijun%3BGong%2C+Xuan%3BChen%2C+Qifu%3BWu%2C+Chunquan&rft.aulast=Wu&rft.aufirst=Jing&rft.date=2012-11-01&rft.volume=39&rft.issue=21&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2012GL053515 L2 - http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291944-8007/issues LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 35 N1 - PubXState - DC N1 - Document feature - illus. incl. sketch map N1 - Last updated - 2014-11-13 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - Asia; Beijing China; China; continental crust; crust; earthquakes; Fangshan Intrusion; Far East; great earthquakes; Hebei China; Indonesia; intrusions; plutons; precursors; seismicity; seismotectonics; Sumatra; Sumatra earthquake 2012; tectonics DO - http://dx.doi.org/10.1029/2012GL053515 ER - TY - JOUR T1 - Coupled simulation of surface-subsurface hydrologic processes with the open-source flow and reactive transport code PFLOTRAN AN - 1438969224; 2013-075246 AB - Advances in subsurface biogeochemical research and advanced computing capabilities have enabled the development of sophisticated, three-dimensional groundwater models employing multiple fluid phases and chemical components, coupled through a suite of biological and geochemical reactions at multiple scales. Such tools have enabled incredibly detailed simulations of contaminant fate and transport, but significant challenges remain in applying them to locations such as the Department of Energy Oak Ridge Reservation (ORR) in East Tennessee where strong interactions between surface and groundwater exist. For example, in Bear Creek valley in Oak Ridge, losing reaches of Bear Creek may deliver nutrients (e.g., labile organic carbon) that are the limiting reactant for microbial consumption of nitrate contamination in the groundwater, and gaining reaches deliver contaminants to surface water. Besides studies of environmental contaminants, the ability to capture coupled surface/subsurface hydrologic interactions is important in eco-hydro-climatological studies, where accurately modeling soil moisture is critical for capturing vegetation dynamics and soil moisture-rainfall feedbacks. To address such challenges, we have added a surface water component to PFLOTRAN. PFLOTRAN is an open-source (LGPL-licensed) code developed for simulation of multiscale, multiphase, multicomponent subsurface flow and reactive transport problems on machines ranging from laptops to leadership-class supercomputers. We have coupled the Richards equation treatment of the subsurface domain with shallow overland flow equations by enforcing continuity of pressure and flux at the ground surface. The underlying solver framework allows significant flexibility in how the governing equations are solved, and we will compare different surface flow formulations and strategies for coupling the surface and subsurface flow domains. We will also present some preliminary coupled surface-subsurface simulations at the ORR, where explicit treatment of overland flow could further improve understanding of the influence of heavy precipitation events on contaminant transport. JF - Abstracts with Programs - Geological Society of America AU - Mills, Richard Tran AU - Bisht, Gautam AU - Hammond, Glenn E AU - Lichtner, Peter AU - Kumar, Jitendra AU - Watson, David B AU - Brooks, Scott C AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 262 EP - 263 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - United States KW - processes KW - Oak Ridge National Laboratory KW - hydrology KW - PFLOTRAN KW - three-dimensional models KW - biochemistry KW - eastern Tennessee KW - surface water KW - pollution KW - equations KW - simulation KW - ground water KW - Roane County Tennessee KW - Bear Creek valley KW - chemical reactions KW - transport KW - Richards equation KW - Tennessee KW - nitrate ion KW - water pollution KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1438969224?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Coupled+simulation+of+surface-subsurface+hydrologic+processes+with+the+open-source+flow+and+reactive+transport+code+PFLOTRAN&rft.au=Mills%2C+Richard+Tran%3BBisht%2C+Gautam%3BHammond%2C+Glenn+E%3BLichtner%2C+Peter%3BKumar%2C+Jitendra%3BWatson%2C+David+B%3BBrooks%2C+Scott+C%3BAnonymous&rft.aulast=Mills&rft.aufirst=Richard&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=262&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-03 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Bear Creek valley; biochemistry; chemical reactions; eastern Tennessee; equations; ground water; hydrology; nitrate ion; Oak Ridge National Laboratory; PFLOTRAN; pollution; processes; Richards equation; Roane County Tennessee; simulation; surface water; Tennessee; three-dimensional models; transport; United States; water pollution ER - TY - JOUR T1 - The ChemCam investigation; compositions at the Curiosity Rover landing site AN - 1434008661; 2013-072036 AB - The Mars Science Laboratory rover, Curiosity, is equipped with an instrument suite named ChemCam, designed for small-footprint elemental composition analysis and context imaging at distances within 7 m of the rover. ChemCam employs laser-induced breakdown spectroscopy (LIBS) to interrogate spots < or = 0.5 mm diameter at these distances using focused approximately 15 mJ pulses which ablate material in electronically excited states, emitting photons at wavelengths that are unique for each element. ChemCam's 240-850 nm spectral range was selected to observe emissions of all elements including H, C, N, and O as well as Li, Be, and B. LIBS is highly sensitive to alkali and alkaline earth elements but has relatively poor sensitivity to halides and sulfur. The Mars atmosphere interferes with C and N observations but does not prevent detection at sufficient (several %) levels. ChemCam's LIBS analyses are semi-quantitative, as abundance determinations rely on comparison with training-set spectra and cross calibration with APXS. Key features of the technique as applied to field geology on Mars are the ability to remove surface dust with repeated laser pulses at the same location and to probe samples for surface coatings or weathering rinds. Depth profiling proceeds at a rate of approximately one micron per pulse for many rocks, and ChemCam can profile up to a few cm into unconsolidated soils. Line scans and rasters can be used to determine sample heterogeneity or to walk up a sequence of layers. Gale Crater was selected as the Curiosity landing site based on the 5 km of sedimentary strata that comprises Mt. Sharp at the center of the crater and based on the evidence for flowing and potentially standing water within and near the landing ellipse. The actual landing site is within 400 m of a junction of several different geological terrains having differing thermal inertias and elevations, suggesting the potential for interesting targets for study early in the mission. JF - Abstracts with Programs - Geological Society of America AU - Wiens, Roger C AU - Maurice, Sylvestre AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 190 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - terrestrial planets KW - planets KW - technology KW - sampling KW - Curiosity Rover KW - ChemCam KW - Mars KW - landing sites KW - geomorphology KW - Mount Sharp KW - exploration KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1434008661?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=The+ChemCam+investigation%3B+compositions+at+the+Curiosity+Rover+landing+site&rft.au=Wiens%2C+Roger+C%3BMaurice%2C+Sylvestre%3BAnonymous&rft.aulast=Wiens&rft.aufirst=Roger&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=190&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-09-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - ChemCam; Curiosity Rover; exploration; geomorphology; landing sites; Mars; Mount Sharp; planets; sampling; technology; terrestrial planets ER - TY - JOUR T1 - CO (sub 2) leakage impacts on shallow groundwater; application of uranium isotope composition to track the origin and mobility of uranium at a natural analog site, Chimayo, NM AN - 1434008290; 2013-072043 AB - Groundwater near Chimayo, northern New Mexico, is affected by CO (sub 2) and saline waters that upwell along a series of regional faults. This site provides an opportunity to investigate groundwater chemistry in the presence of elevated CO (sub 2) , and can provide insight into potential impacts of CO (sub 2) and brine migration on a drinking water aquifer. Sequential extraction experiments in aquifer sediments indicate that uranium (U) is primarily found in the exchangeable, carbonate mineral, and Mn-oxide fractions. This suggests that cation exchange/adsorption and dissolution/precipitation of calcite could be important reactions controlling U in groundwater. However, prior modeling suggests that increased U concentrations found in well waters near fault-related CO (sub 2) release is primarily due to entrainment of U from brackish water associated with the deep CO (sub 2) . In order to understand the factors leading to U release under different CO (sub 2) levels, U isotope data were obtained for eight groundwaters, including a CO (sub 2) -rich upwelling brine. Uranium concentrations range from 10 to 497 ppb and generally show a positive correlation with dissolved CO (sub 2) concentration, with the notable exception of the sample with the highest U concentration. Preliminary isotopic results yield (super 234) U/ (super 238) U activity ratios (AR) that range from 1.0 to 5.9 and vary widely even in wells in close proximity to each other. The high ARs suggest a significant flux from recently weathered material, either soil or host aquifer minerals. Groundwater (super 238) U/ (super 235) U ratios fall between 137.75 and 137.95. Waters with elevated CO (sub 2) (>20 mmol dissolved CO (sub 2) ) also yield the lowest (super 238) U/ (super 235) U ratios. Hyperbolic relationships between (super 238) U/ (super 235) U and U concentration and dissolved CO (sub 2) in most samples suggest a mixing relationship between high-CO (sub 2) brines and low-CO (sub 2) ground waters. This is further bolstered by an inverse relationship between (super 238) U/ (super 235) U and (super 87) Sr/ (super 86) Sr. We hypothesize that dissolution of U-bearing minerals under oxidizing conditions by deep, CO (sub 2) -charged brines resulted in fractionation of (super 238) U/ (super 235) U, and the resultant isotopically light fluid subsequently mixed with shallower ground waters. Additional variation in the (super 238) U/ (super 235) U ratios could have been induced by exchange and dissolution/precipitation reactions in the aquifer. JF - Abstracts with Programs - Geological Society of America AU - Phan, Thai T AU - Capo, Rosemary C AU - Stewart, Brian W AU - Gardiner, James B AU - Macpherson, G L AU - Hakala, J Alexandra AU - Keating, Elizabeth H AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 191 EP - 192 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - United States KW - Rio Arriba County New Mexico KW - isotopes KW - pollution KW - New Mexico KW - drinking water KW - seepage KW - ground water KW - carbon dioxide KW - aquifers KW - metals KW - Chimayo New Mexico KW - uranium KW - geochemistry KW - actinides KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1434008290?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=CO+%28sub+2%29+leakage+impacts+on+shallow+groundwater%3B+application+of+uranium+isotope+composition+to+track+the+origin+and+mobility+of+uranium+at+a+natural+analog+site%2C+Chimayo%2C+NM&rft.au=Phan%2C+Thai+T%3BCapo%2C+Rosemary+C%3BStewart%2C+Brian+W%3BGardiner%2C+James+B%3BMacpherson%2C+G+L%3BHakala%2C+J+Alexandra%3BKeating%2C+Elizabeth+H%3BAnonymous&rft.aulast=Phan&rft.aufirst=Thai&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=191&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-09-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - actinides; aquifers; carbon dioxide; Chimayo New Mexico; drinking water; geochemistry; ground water; isotopes; metals; New Mexico; pollution; Rio Arriba County New Mexico; seepage; United States; uranium ER - TY - JOUR T1 - Biogeochemistry of uranium in high ionic-strength brine AN - 1434005553; 2013-073279 AB - The biogeochemistry of uranium in high ionic-strength brine is being investigated to establish its oxidation state distribution, solubility and tendency to form colloids under a wide range of conditions. This research directly supports the ongoing recertification of the WIPP transuranic salt repository but also supports the evaluation of a salt-based repository option for high-level nuclear waste. The long-term solubility of uranium(VI) was determined in a high magnesium (GWB) and high sodium chloride (ERDA-6) simulated brine in the presence and absence of carbonate. The solubility was approximately 10 (super -6) M in GWB brine at pC (sub H+) > or = 7 and about 10 (super -8) - 10 (super -7) M in ERDA-6 at pC (sub H+) > or = 8 when no carbonate was present. A small effect of tetraborate, a minor constituent of the simulated brines, was also noted. As expected, uranium-carbonate species predominated when carbonate was present. The highest uranium solubility measured (10 mM dissolved carbonate) was approximately 10 (super -4) M, under WIPP-related conditions (pC (sub H+) approximately 9). These results are well below the current 1 mM solubility used in WIPP performance assessment. A relatively small contribution of colloidal uranium was observed in these long-term solubility experiments. The oxidation-state distribution of uranium is important in establishing the safety case for multivalent actinides in salt-based repositories. Uranium(VI) was stable over a wide range of conditions under oxic conditions but was reduced to U(IV) by zero-valent iron and microorganisms under anoxic/anaerobic conditions. The halophilic bacterial and archaeal communities that are indigenous to the WIPP are being characterized in a parallel/ongoing study. Metal-reducing microorganisms have been identified and bioreduction to form U(IV) phases occurred. Zero-valent iron, over time, also reduced U(VI) to U(IV) but we have not been able to show that an aqueous Fe (super 2+) reaction pathway exists. In the highly reducing conditions expected in an iron-dominated subsurface in sealed salt the U(IV) oxidation state is expected to predominate. These biogeochemical results positively support the safety case for the permanent disposal of uranium in a salt repository and demonstrate the importance of redox-active reactive barriers, such as reduced iron, in repository performance. JF - Abstracts with Programs - Geological Society of America AU - Reed, Donald T AU - Swanson, Juliet AU - Lucchini, Jean Francois AU - Richmann, Michael AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 216 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - metals KW - biochemistry KW - oxidation KW - brines KW - uranium KW - solubility KW - actinides KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1434005553?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Biogeochemistry+of+uranium+in+high+ionic-strength+brine&rft.au=Reed%2C+Donald+T%3BSwanson%2C+Juliet%3BLucchini%2C+Jean+Francois%3BRichmann%2C+Michael%3BAnonymous&rft.aulast=Reed&rft.aufirst=Donald&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=216&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-09-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - actinides; biochemistry; brines; metals; oxidation; solubility; uranium ER - TY - JOUR T1 - Neutron reflectometry characterization of PEI-PSS polyelectrolyte multilayers for cell culture AN - 1283702475; 17439615 AB - Using Neutron Reflectometry (NR), polyelectrolyte multilayer (PEM) films made by layer-by-layer (LbL) deposition of a strong polycation (polyethylene imine [PEI]) and a polyanion (polystyrene sulfonate [PSS]) have been characterized. PEI terminated samples with a total of 5, 7, and 9 layers were deposited on a quartz substrate and studied under three different environmental conditions (i.e., dry air, 100% relative humidity, and bulk water). We were able to model all the measurements at three different contrast conditions using one simple, physically reasonable and consistent model, which led to a firm understanding of the structure of the systems. The PEM thickness was found to vary linearly with the number of layers deposited. Thin film structures formed using the LbL method were constituted of two distinctive regions, i.e., the bottom and top strata. When measured in dry air and D sub(2)O vapors, the similar to 30 to 50 Aa thick bottom stratum was found to consist of loosely packed polymers (i.e.30% polymer by volume). This region could have resulted from an island type of deposition during the initial stages of LbL assembly. In contrast, the thickness of the top strata, which consisted of densely packed polymers (i.e.100% polymer by volume when measured in dry air), was found to vary linearly with the number of layers deposited. Upon exposure to D sub(2)O saturated vapors, it was observed that the top and bottom strata absorbed significant quantities of heavy water, accompanied with PEM swelling. We estimated that in this case, the top strata comprise ca.57% (v/v) polymer and 43% (v/v) D sub(2)O for 7- and 9-layered samples. No further swelling of the PEM samples was observed when they were exposed to bulk D sub(2)O. Nevertheless, the entire polymeric system underwent a rearrangement leading towards the homogenization of the multilayered structure, suggested by the decreased scattering contrast between the top and bottom strata. We also performed studies to assess the cytocompatibility of 7-layered PEM structures. Two different cell types, fibroblasts (3T3) and human embryo kidney cells (HEK-293), were seeded on the polyelectrolyte multilayer, and the cell coverage was monitored by optical microscopy at varying times. Our observations confirmed that cells adhered and spread on PEM substrates, which showed no sign of immediate toxicity. Therefore, such multilayers proved to be a suitable support for 3T3 and HEK-293 cell growth. JF - Soft Matter AU - Singh, Saurabh AU - Junghans, Ann AU - Waltman, Mary J AU - Nagy, Amber AU - Iyer, Rashi AU - Majewski, Jaroslaw AD - Manual Lujan Jr Neutron Scattering Center; Los Alamos National Laboratory; NM 87545; USA; , jarek@lanl.gov Y1 - 2012/11// PY - 2012 DA - Nov 2012 SP - 11484 EP - 11491 PB - Royal Society of Chemistry VL - 8 IS - 45 SN - 1744-683X, 1744-683X KW - Biotechnology and Bioengineering Abstracts KW - Relative humidity KW - Polyethylene KW - Cell culture KW - Toxicity KW - Fibroblasts KW - Polycations KW - Neutrons KW - Vapors KW - Islands KW - Quartz KW - Microscopy KW - Polyanions KW - polystyrene KW - Polyelectrolytes KW - Embryos KW - Environmental conditions KW - Films KW - W 30945:Fermentation & Cell Culture UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1283702475?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Soft+Matter&rft.atitle=Neutron+reflectometry+characterization+of+PEI-PSS+polyelectrolyte+multilayers+for+cell+culture&rft.au=Singh%2C+Saurabh%3BJunghans%2C+Ann%3BWaltman%2C+Mary+J%3BNagy%2C+Amber%3BIyer%2C+Rashi%3BMajewski%2C+Jaroslaw&rft.aulast=Singh&rft.aufirst=Saurabh&rft.date=2012-11-01&rft.volume=8&rft.issue=45&rft.spage=11484&rft.isbn=&rft.btitle=&rft.title=Soft+Matter&rft.issn=1744683X&rft_id=info:doi/10.1039%2Fc2sm26433a LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-07-01 N1 - Number of references - 29 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Relative humidity; Polyethylene; Cell culture; Toxicity; Fibroblasts; Neutrons; Polycations; Vapors; Islands; Quartz; Polyanions; Microscopy; Polyelectrolytes; polystyrene; Embryos; Environmental conditions; Films DO - http://dx.doi.org/10.1039/c2sm26433a ER - TY - JOUR T1 - Time-reversal method and cross-correlation techniques by normal mode theory; a three-point problem AN - 1282821468; 2013-013544 AB - Since its beginning in acoustics, the Time-Reversal method (hereafter referred as TR) has been explored by different studies to locate and characterize seismic sources in elastic media. But few authors have proposed an analytical analysis of the method, especially in the case of an elastic medium and for a finite body such as the Earth. In this paper, we use a normal mode approach (for general 3-D case and degenerate modes in 1-D reference model) to investigate the convergence properties of the TR method. We first investigate a three-point problem, with two fixed points which are the source and the receiver and a third one corresponding to a changing observation point. We extend the problem of a single channel TR experiment to a multiple channel and multiple station TR experiment. We show as well how this problem relates to the retrieval of Green's function with a multiple source cross-correlation and also the differences between TR method and cross-correlation techniques. Since most of the noise sources are located close to the surface of the Earth, we show that the time derivative of the cross-correlation of long-period seismograms with multiple sources at the surface is different from the Green's function. Next, we show the importance of a correct surface-area weighting of the signal resent by the stations according to a Voronoi tessellation of the Earth surface. We use arguments based on the stationary phase approximation to argue that phase-information is more important than amplitude information for getting a good focusing in TR experiment. Finally, by using linear relationships between the time-reversed displacement (resp. strain wavefields) and the components of a vector force source (resp. a moment tensor source), we show how to retrieve force (or moment tensor components) of any long period tectonic or environmental sources by time reversal. Abstract Copyright (2012), RAS. JF - Geophysical Journal International AU - Montagner, J P AU - Larmat, C AU - Capdeville, Y AU - Fink, M AU - Phung, H AU - Romanowicz, B AU - Clevede, E AU - Kawakatsu, H Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 637 EP - 652 PB - Oxford University Press on behalf of The Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft and the European Geophysical Society VL - 191 IS - 2 SN - 0956-540X, 0956-540X KW - time series analysis KW - guided waves KW - free oscillations KW - statistical analysis KW - elastic waves KW - normal mode theory KW - interferometry KW - surface waves KW - time reversal method KW - crosscorrelation KW - focus KW - seismic waves KW - earthquakes KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282821468?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Journal+International&rft.atitle=Time-reversal+method+and+cross-correlation+techniques+by+normal+mode+theory%3B+a+three-point+problem&rft.au=Montagner%2C+J+P%3BLarmat%2C+C%3BCapdeville%2C+Y%3BFink%2C+M%3BPhung%2C+H%3BRomanowicz%2C+B%3BClevede%2C+E%3BKawakatsu%2C+H&rft.aulast=Montagner&rft.aufirst=J&rft.date=2012-11-01&rft.volume=191&rft.issue=2&rft.spage=637&rft.isbn=&rft.btitle=&rft.title=Geophysical+Journal+International&rft.issn=0956540X&rft_id=info:doi/10.1111%2Fj.1365-246X.2012.05619.x L2 - http://www.blackwellpublishing.com/journal.asp?ref=0956-540X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 57 N1 - Document feature - illus. incl. sketch maps N1 - Last updated - 2013-02-05 N1 - SubjectsTermNotLitGenreText - crosscorrelation; earthquakes; elastic waves; focus; free oscillations; guided waves; interferometry; normal mode theory; seismic waves; statistical analysis; surface waves; time reversal method; time series analysis DO - http://dx.doi.org/10.1111/j.1365-246X.2012.05619.x ER - TY - JOUR T1 - Quantifying transport uncertainty in unsaturated rock using Monte Carlo sampling of retention curves AN - 1270041746; 2013-009587 AB - We have developed a new Monte Carlo sampling method for simulating flow and transport in unsaturated porous media, characterized by van Genuchten-Mualem constitutive relations. Instead of sampling each individual soil parameter from its probability space and then running Monte Carlo simulations using realizations of rock parameters directly, we calculate retention curves from realizations of rock parameters, take subsamples from these retention curves, and run simulations using parameter realizations corresponding to these selected retention curves. The retention curve subsampling methodology was applied to three-dimensional simulations of conservative tracer transport beneath Material Disposal Area G at the Los Alamos National Laboratory. Convergence of the proposed sampling method was assessed by comparing statistics of breakthrough curves observed at a compliance boundary with those obtained using between 25 and 1000 Latin hypercube sampling (LHS) Monte Carlo simulations. Our example shows that 25 model runs based on selected retention curves could adequately approximate the results from our assumed truth (1000 LHS Monte Carlo simulations), while LHS alone required in excess of 50 realizations to achieve the same quality result. Another finding from this work is that the median of the breakthrough curves was more meaningful than the arithmetic mean of curves, and the former was nearly identical to the breakthrough curve derived from mean rock properties. JF - Vadose Zone Journal AU - Stauffer, Philip H AU - Lu, Zhiming Y1 - 2012/11// PY - 2012 DA - November 2012 PB - Soil Science Society of America, Madison, WI VL - 11 IS - 4 KW - United States KW - Pajarito Plateau KW - unsaturated zone KW - hydrogeology KW - New Mexico KW - Los Alamos County New Mexico KW - simulation KW - Cenozoic KW - finite element analysis KW - hydrologic cycle KW - Bandelier Tuff KW - transport KW - sampling KW - quantitative analysis KW - tracers KW - retention KW - Tsirege Member KW - Latin hypercube technique KW - breakthrough curves KW - mass transfer KW - uncertainty KW - soils KW - hydrology KW - experimental studies KW - van Genuchten-Mualem model KW - Quaternary KW - numerical models KW - Monte Carlo analysis KW - statistical analysis KW - White Rock New Mexico KW - Los Alamos National Laboratory KW - boundary conditions KW - heterogeneous materials KW - saturation KW - Pleistocene KW - constitutive equations KW - waste disposal KW - low-level waste KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270041746?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Vadose+Zone+Journal&rft.atitle=Quantifying+transport+uncertainty+in+unsaturated+rock+using+Monte+Carlo+sampling+of+retention+curves&rft.au=Stauffer%2C+Philip+H%3BLu%2C+Zhiming&rft.aulast=Stauffer&rft.aufirst=Philip&rft.date=2012-11-01&rft.volume=11&rft.issue=4&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Vadose+Zone+Journal&rft.issn=1539-1663&rft_id=info:doi/10.2136%2Fvzj2011.0171 L2 - http://www.vadosezonejournal.org LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 33 N1 - PubXState - WI N1 - Document feature - illus. incl. 1 table, sketch map N1 - Last updated - 2013-01-17 N1 - SubjectsTermNotLitGenreText - Bandelier Tuff; boundary conditions; breakthrough curves; Cenozoic; constitutive equations; experimental studies; finite element analysis; heterogeneous materials; hydrogeology; hydrologic cycle; hydrology; Latin hypercube technique; Los Alamos County New Mexico; Los Alamos National Laboratory; low-level waste; mass transfer; Monte Carlo analysis; New Mexico; numerical models; Pajarito Plateau; Pleistocene; quantitative analysis; Quaternary; retention; sampling; saturation; simulation; soils; statistical analysis; tracers; transport; Tsirege Member; uncertainty; United States; unsaturated zone; van Genuchten-Mualem model; waste disposal; White Rock New Mexico DO - http://dx.doi.org/10.2136/vzj2011.0171 ER - TY - JOUR T1 - Simulation of radionuclide transport through unsaturated, fractured rock; application to Yucca Mountain, Nevada AN - 1270041535; 2013-009594 AB - This paper describes the numerical methods developed to simulate the transport of radionuclides through the unsaturated, fractured rock below the proposed repository at the Yucca Mountain. Regardless of the disposition of the Yucca Mountain License Application, this method has general applicability for modeling contaminant transport through deep vadose zones. Using a dual-permeability solution for fluid flow as a basis, the transport model represents contaminant transport with a cell-based particle-tracking technique in which particles move from cell to cell in the three-dimensional large-scale grid of two overlapping continua. Particle movement between cells, and the residence time within a cell, is computed probabilistically based on transfer functions using numerical solutions of the transport equations for an idealized fracture-matrix system. Using this approach, the following transport phenomena are simulated: advection through fracture and matrix continua, including between these continua, dispersion, sorption of dissolved radionuclides to the matrix continuum, and within the fault zones, and molecular diffusion between the fractures and matrix. In addition to providing a realistic representation of the relevant processes, this method has the virtue of computational efficiency. After describing the numerical method, this paper presents sensitivity analyses for radionuclide transport travel time distributions from the proposed repository to the water table through the unsaturated zone for the Yucca Mountain system. JF - Vadose Zone Journal AU - Robinson, Bruce A AU - Chu, Shaoping AU - Lu, Zhiming Y1 - 2012/11// PY - 2012 DA - November 2012 PB - Soil Science Society of America, Madison, WI VL - 11 IS - 4 KW - United States KW - fractured materials KW - sorption KW - neptunium KW - volcanic rocks KW - isotopes KW - plutonium KW - igneous rocks KW - unsaturated zone KW - discrete fracture model KW - fracturing KW - simulation KW - radioactive waste KW - radioactive isotopes KW - transport KW - movement KW - tracers KW - applications KW - tuff KW - Calico Hills Formation KW - Yucca Mountain KW - uncertainty KW - Nevada KW - technetium KW - numerical models KW - Np-237 KW - statistical analysis KW - Tc-99 KW - equations KW - advection KW - Nye County Nevada KW - pyroclastics KW - metals KW - infiltration KW - traveltime KW - waste disposal KW - actinides KW - permeability KW - Pu-240 KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270041535?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Vadose+Zone+Journal&rft.atitle=Simulation+of+radionuclide+transport+through+unsaturated%2C+fractured+rock%3B+application+to+Yucca+Mountain%2C+Nevada&rft.au=Robinson%2C+Bruce+A%3BChu%2C+Shaoping%3BLu%2C+Zhiming&rft.aulast=Robinson&rft.aufirst=Bruce&rft.date=2012-11-01&rft.volume=11&rft.issue=4&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Vadose+Zone+Journal&rft.issn=1539-1663&rft_id=info:doi/10.2136%2Fvzj2011.0142 L2 - http://www.vadosezonejournal.org LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 63 N1 - PubXState - WI N1 - Document feature - illus. N1 - SuppNotes - Includes appendix; supplemental information/data is available in the online version of this article N1 - Last updated - 2013-01-17 N1 - SubjectsTermNotLitGenreText - actinides; advection; applications; Calico Hills Formation; discrete fracture model; equations; fractured materials; fracturing; igneous rocks; infiltration; isotopes; metals; movement; neptunium; Nevada; Np-237; numerical models; Nye County Nevada; permeability; plutonium; Pu-240; pyroclastics; radioactive isotopes; radioactive waste; simulation; sorption; statistical analysis; Tc-99; technetium; tracers; transport; traveltime; tuff; uncertainty; United States; unsaturated zone; volcanic rocks; waste disposal; Yucca Mountain DO - http://dx.doi.org/10.2136/vzj2011.0142 ER - TY - JOUR T1 - Numerical evaluation of effective unsaturated hydraulic properties of fractured rocks using a stochastic continuum approach AN - 1270041527; 2013-009590 AB - This study builds on past studies that have investigated the effective properties of unsaturated porous media and merges stochastic continuum concepts to develop a numerical procedure for estimating the effective flow parameters that are independent of pressure head or saturation. The procedure involves the development of a numerical permeameter based on randomly generated, spatially correlated fields of fundamental fracture properties such as spacing and aperture. Local values of hydraulic conductivity, and the van Genuchten fitting parameters alpha and n in this random field are computed from local values of mechanical aperture and spacing based on the cubic law and relationships established from pore-scale fracture simulations. By considering multiple realizations of these spatially correlated fields and by running the numerical permeameter over a range of effective saturations and flow rates, outputs are generated that can be fit with the standard van Genuchten model to estimate block effective values of saturated hydraulic conductivity and the van Genuchten unsaturated hydraulic parameters of a fracture continuum at the field scale. These parameters can then be incorporated to conventional numerical simulators originally developed for porous media. The study shows that reasonable approximations to the results obtained through computationally demanding stochastic simulations can be developed based on estimates of the mean fracture spacing and aperture. Although the example application assumes the presence of an impermeable rock matrix, the hydraulic properties estimated for the fracture continuum with this methodology can be combined with those measured or similarly estimated for a matrix continuum in dual-permeability continuum models. JF - Vadose Zone Journal AU - Lu, Zhiming AU - Kwicklis, Edward M Y1 - 2012/11// PY - 2012 DA - November 2012 PB - Soil Science Society of America, Madison, WI VL - 11 IS - 4 KW - United States KW - scale factor KW - fractured materials KW - volcanic rocks KW - stochastic continuum KW - igneous rocks KW - unsaturated zone KW - simulation KW - Nevada Test Site KW - fractures KW - stochastic processes KW - hydrodynamics KW - tuff KW - Yucca Mountain KW - Nevada KW - well logs KW - numerical models KW - Monte Carlo analysis KW - statistical analysis KW - porous materials KW - correlation KW - equations KW - Nye County Nevada KW - pyroclastics KW - boreholes KW - heterogeneous materials KW - hydraulic conductivity KW - permeability KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270041527?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Vadose+Zone+Journal&rft.atitle=Numerical+evaluation+of+effective+unsaturated+hydraulic+properties+of+fractured+rocks+using+a+stochastic+continuum+approach&rft.au=Lu%2C+Zhiming%3BKwicklis%2C+Edward+M&rft.aulast=Lu&rft.aufirst=Zhiming&rft.date=2012-11-01&rft.volume=11&rft.issue=4&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Vadose+Zone+Journal&rft.issn=1539-1663&rft_id=info:doi/10.2136%2Fvzj2011.0164 L2 - http://www.vadosezonejournal.org LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 22 N1 - PubXState - WI N1 - Document feature - illus. N1 - Last updated - 2013-01-17 N1 - SubjectsTermNotLitGenreText - boreholes; correlation; equations; fractured materials; fractures; heterogeneous materials; hydraulic conductivity; hydrodynamics; igneous rocks; Monte Carlo analysis; Nevada; Nevada Test Site; numerical models; Nye County Nevada; permeability; porous materials; pyroclastics; scale factor; simulation; statistical analysis; stochastic continuum; stochastic processes; tuff; United States; unsaturated zone; volcanic rocks; well logs; Yucca Mountain DO - http://dx.doi.org/10.2136/vzj2011.0164 ER - TY - JOUR T1 - On assessing the robustness of Structural Health Monitoring technologies AN - 1268656084; 17482315 AB - As Structural Health Monitoring continues to gain popularity, both as an area of research and as a tool for use in industrial applications, the number of technologies associated with Structural Health Monitoring will also continue to grow. As a result, the engineer tasked with developing a Structural Health Monitoring system is faced with myriad hardware and software technologies from which to choose, often adopting an ad hoc qualitative approach based on physical intuition or past experience to making such decisions, and offering little in the way of justification for a particular decision. This article offers a framework that aims to provide the engineer with a quantitative approach for choosing from among a suite of candidate Structural Health Monitoring technologies. The framework is outlined for the general case, where a supervised learning approach to Structural Health Monitoring is adopted and is then demonstrated on two problems commonly encountered when developing Structural Health Monitoring systems: (a) selection of damage-sensitive features, where the engineer must determine the appropriate order of an autoregressive model for modeling of time-history data, and (b) selection of a damage classifier, where the engineer must select from among a suite of candidate classifiers, the one most appropriate for the task at hand. The data employed for these problems are taken from a preliminary study that examined the feasibility of applying Structural Health Monitoring technologies to the RAPid Telescopes for Optical Response observatory network. JF - Structural Health Monitoring AU - Stull, Christopher J AU - Hemez, Francois M AU - Farrar, Charles R AD - Los Alamos National Laboratory, Los Alamos, NM, USA Y1 - 2012/11// PY - 2012 DA - Nov 2012 SP - 712 EP - 723 PB - Sage Publications Ltd., 6 Bonhill St. London EC2A 4PU United Kingdom VL - 11 IS - 6 SN - 1475-9217, 1475-9217 KW - Health & Safety Science Abstracts KW - Structural Health Monitoring KW - information-gap decision theory KW - decision making KW - model selection KW - uncertainty KW - autoregressive model KW - Feasibility studies KW - Computer programs KW - Ethnic groups KW - Technology KW - H 15000:Civil/Structural Engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1268656084?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthsafetyabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Structural+Health+Monitoring&rft.atitle=On+assessing+the+robustness+of+Structural+Health+Monitoring+technologies&rft.au=Stull%2C+Christopher+J%3BHemez%2C+Francois+M%3BFarrar%2C+Charles+R&rft.aulast=Stull&rft.aufirst=Christopher&rft.date=2012-11-01&rft.volume=11&rft.issue=6&rft.spage=712&rft.isbn=&rft.btitle=&rft.title=Structural+Health+Monitoring&rft.issn=14759217&rft_id=info:doi/10.1177%2F1475921712451956 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-01-01 N1 - Number of references - 21 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Feasibility studies; Computer programs; Ethnic groups; Technology DO - http://dx.doi.org/10.1177/1475921712451956 ER - TY - JOUR T1 - Recent summer precipitation trends in the Greater Horn of Africa and the emerging role of Indian Ocean sea surface temperature AN - 1171888876; 17345956 AB - We utilize a variety of climate datasets to examine impacts of two mechanisms on precipitation in the Greater Horn of Africa (GHA) during northern-hemisphere summer. First, surface-pressure gradients draw moist air toward the GHA from the tropical Atlantic Ocean and Congo Basin. Variability of the strength of these gradients strongly influences GHA precipitation totals and accounts for important phenomena such as the 1960s-1980s rainfall decline and devastating 1984 drought. Following the 1980s, precipitation variability became increasingly influenced by the southern tropical Indian Ocean (STIO) region. Within this region, increases in sea-surface temperature, evaporation, and precipitation are linked with increased exports of dry mid-tropospheric air from the STIO region toward the GHA. Convergence of dry air above the GHA reduces local convection and precipitation. It also produces a clockwise circulation response near the ground that reduces moisture transports from the Congo Basin. Because precipitation originating in the Congo Basin has a unique isotopic signature, records of moisture transports from the Congo Basin may be preserved in the isotopic composition of annual tree rings in the Ethiopian Highlands. A negative trend in tree-ring oxygen-18 during the past half century suggests a decline in the proportion of precipitation originating from the Congo Basin. This trend may not be part of a natural cycle that will soon rebound because climate models characterize Indian Ocean warming as a principal signature of greenhouse-gas induced climate change. We therefore expect surface warming in the STIO region to continue to negatively impact GHA precipitation during northern-hemisphere summer. JF - Climate Dynamics AU - Williams, APark AU - Funk, Chris AU - Michaelsen, Joel AU - Rauscher, Sara A AU - Robertson, Iain AU - Wils, Tommy HG AU - Koprowski, Marcin AU - Eshetu, Zewdu AU - Loader, Neil J AD - Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM, USA, parkwilliams@lanl.gov Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 2307 EP - 2328 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 39 IS - 9-10 SN - 0930-7575, 0930-7575 KW - Pollution Abstracts; Oceanic Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Sustainability Science Abstracts; Meteorological & Geoastrophysical Abstracts KW - Convection KW - Sea surface KW - Evaporation KW - Rainfall KW - Moisture transport KW - Climate change KW - Basins KW - Summer KW - Convection development KW - Exports KW - Convergence KW - Ocean-atmosphere system KW - Tree ring analysis KW - Droughts KW - Marine KW - ISW, Indian Ocean KW - Chemical composition KW - Temperature KW - Atmospheric circulation KW - Precipitation KW - Water temperature KW - AS, Tropical Atlantic KW - ISW, Tropical Indian Ocean KW - Oceans KW - Precipitation variability KW - Greenhouse gases KW - Q2 09243:Structure, mechanics and thermodynamics KW - P 0000:AIR POLLUTION KW - M3 1010:Issues in Sustainable Development KW - O 2070:Meteorology KW - M2 556.13:Evaporation/Evapotranspiration (556.13) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1171888876?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Climate+Dynamics&rft.atitle=Recent+summer+precipitation+trends+in+the+Greater+Horn+of+Africa+and+the+emerging+role+of+Indian+Ocean+sea+surface+temperature&rft.au=Williams%2C+APark%3BFunk%2C+Chris%3BMichaelsen%2C+Joel%3BRauscher%2C+Sara+A%3BRobertson%2C+Iain%3BWils%2C+Tommy+HG%3BKoprowski%2C+Marcin%3BEshetu%2C+Zewdu%3BLoader%2C+Neil+J&rft.aulast=Williams&rft.aufirst=APark&rft.date=2012-11-01&rft.volume=39&rft.issue=9-10&rft.spage=2307&rft.isbn=&rft.btitle=&rft.title=Climate+Dynamics&rft.issn=09307575&rft_id=info:doi/10.1007%2Fs00382-011-1222-y LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-11-01 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Convection; Sea surface; Chemical composition; Climate change; Ocean-atmosphere system; Water temperature; Droughts; Evaporation; Convergence; Moisture transport; Precipitation variability; Atmospheric circulation; Convection development; Precipitation; Tree ring analysis; Exports; Oceans; Rainfall; Temperature; Basins; Summer; Greenhouse gases; ISW, Indian Ocean; ISW, Tropical Indian Ocean; AS, Tropical Atlantic; Marine DO - http://dx.doi.org/10.1007/s00382-011-1222-y ER - TY - JOUR T1 - Gradual regime shifts in spatially extended ecosystems AN - 1125237076; 17319464 AB - Ecosystem regime shifts are regarded as abrupt global transitions from one stable state to an alternative stable state, induced by slow environmental changes or by global disturbances. Spatially extended ecosystems, however, can also respond to local disturbances by the formation of small domains of the alternative state. Such a response can lead to gradual regime shifts involving front propagation and the coalescence of alternative-state domains. When one of the states is spatially patterned, a multitude of intermediate stable states appears, giving rise to step-like gradual shifts with extended pauses at these states. Using a minimal model, we study gradual state transitions and show that they precede abrupt transitions. We propose indicators to probe gradual regime shifts, and suggest that a combination of abrupt-shift indicators and gradual-shift indicators might be needed to unambiguously identify regime shifts. Our results are particularly relevant to desertification in drylands where transitions to bare soil take place from spotted vegetation, and the degradation process appears to involve step-like events of local vegetation mortality caused by repeated droughts. JF - Theoretical Ecology AU - Bel, Golan AU - Hagberg, Aric AU - Meron, Ehud AD - Department of Solar Energy and Environmental Physics, BIDR, Ben-Gurion University, Sede Boqer Campus, Midreshet Ben-Gurion, 84990, Israel, hagberg@lanl.gov Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 591 EP - 604 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 5 IS - 4 SN - 1874-1738, 1874-1738 KW - Ecology Abstracts KW - Soil KW - Mortality KW - Desertification KW - Environmental changes KW - Probes KW - Vegetation KW - Droughts KW - Models KW - D 04030:Models, Methods, Remote Sensing UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1125237076?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Theoretical+Ecology&rft.atitle=Gradual+regime+shifts+in+spatially+extended+ecosystems&rft.au=Bel%2C+Golan%3BHagberg%2C+Aric%3BMeron%2C+Ehud&rft.aulast=Bel&rft.aufirst=Golan&rft.date=2012-11-01&rft.volume=5&rft.issue=4&rft.spage=591&rft.isbn=&rft.btitle=&rft.title=Theoretical+Ecology&rft.issn=18741738&rft_id=info:doi/10.1007%2Fs12080-011-0149-6 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2016-03-17 N1 - SubjectsTermNotLitGenreText - Soil; Mortality; Desertification; Environmental changes; Probes; Vegetation; Droughts; Models DO - http://dx.doi.org/10.1007/s12080-011-0149-6 ER - TY - CPAPER T1 - Investigating the Role of Coupled Thermal-Hydrological-Mechanical (THM) Processes During Geological Sequestration of CO2 T2 - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AN - 1313110071; 6167119 JF - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AU - Kelkar, Sharad AU - Pawar, Rajesh AU - Zyvoloski, George AU - Stauffer, Philip AU - Viswanathan, Hari Y1 - 2012/10/28/ PY - 2012 DA - 2012 Oct 28 KW - Geology KW - Carbon dioxide UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313110071?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.atitle=Investigating+the+Role+of+Coupled+Thermal-Hydrological-Mechanical+%28THM%29+Processes+During+Geological+Sequestration+of+CO2&rft.au=Kelkar%2C+Sharad%3BPawar%2C+Rajesh%3BZyvoloski%2C+George%3BStauffer%2C+Philip%3BViswanathan%2C+Hari&rft.aulast=Kelkar&rft.aufirst=Sharad&rft.date=2012-10-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2012/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Numerical Simulation of Reservoir-Wellbore Fluid Flow Simulations At Geologic CO2 Sequestration Sites: Coupled or De-Coupled? T2 - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AN - 1313110050; 6167118 JF - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AU - Pawar, Rajesh AU - Wainwright, Haruko AU - Dilmore, Robert AU - Birkholzer, Jens AU - Houseworth, Jim AU - Bromhal, Grant Y1 - 2012/10/28/ PY - 2012 DA - 2012 Oct 28 KW - Simulation KW - Geology KW - Carbon dioxide KW - Fluid flow KW - Mathematical models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313110050?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.atitle=Numerical+Simulation+of+Reservoir-Wellbore+Fluid+Flow+Simulations+At+Geologic+CO2+Sequestration+Sites%3A+Coupled+or+De-Coupled%3F&rft.au=Pawar%2C+Rajesh%3BWainwright%2C+Haruko%3BDilmore%2C+Robert%3BBirkholzer%2C+Jens%3BHouseworth%2C+Jim%3BBromhal%2C+Grant&rft.aulast=Pawar&rft.aufirst=Rajesh&rft.date=2012-10-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2012/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - The nonlinearity parameter, B/A, in FC-43 Fluorinert up to 373 K and 13.8 MPa T2 - 164th Meeting of the Acoustical Society of America AN - 1313124230; 6196466 JF - 164th Meeting of the Acoustical Society of America AU - Sturtevant, Blake AU - Pantea, Cristian AU - Sinha, Dipen Y1 - 2012/10/22/ PY - 2012 DA - 2012 Oct 22 KW - Nonlinearity KW - nonlinear systems UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313124230?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=164th+Meeting+of+the+Acoustical+Society+of+America&rft.atitle=The+nonlinearity+parameter%2C+B%2FA%2C+in+FC-43+Fluorinert+up+to+373+K+and+13.8+MPa&rft.au=Sturtevant%2C+Blake%3BPantea%2C+Cristian%3BSinha%2C+Dipen&rft.aulast=Sturtevant&rft.aufirst=Blake&rft.date=2012-10-22&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=164th+Meeting+of+the+Acoustical+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - http://acousticalsociety.org/sites/default/files/KC_fullweek.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Nusselt numbers of laminar, oscillating flows in stacks and regenerators with pores of arbitrary cross-sectional geometry T2 - 164th Meeting of the Acoustical Society of America AN - 1313124219; 6196458 JF - 164th Meeting of the Acoustical Society of America AU - Brady, John Y1 - 2012/10/22/ PY - 2012 DA - 2012 Oct 22 KW - Stacks KW - Pores UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313124219?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=164th+Meeting+of+the+Acoustical+Society+of+America&rft.atitle=Nusselt+numbers+of+laminar%2C+oscillating+flows+in+stacks+and+regenerators+with+pores+of+arbitrary+cross-sectional+geometry&rft.au=Brady%2C+John&rft.aulast=Brady&rft.aufirst=John&rft.date=2012-10-22&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=164th+Meeting+of+the+Acoustical+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - http://acousticalsociety.org/sites/default/files/KC_fullweek.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Modeling the generation of infrasound from earthquakes T2 - 164th Meeting of the Acoustical Society of America AN - 1313119529; 6196579 JF - 164th Meeting of the Acoustical Society of America AU - Arrowsmith, Stephen AU - Burlacu, Relu AU - Pankow, Kristine AU - Stump, Brian AU - Stead, Richard AU - Whitaker, Rod AU - Hayward, Chris Y1 - 2012/10/22/ PY - 2012 DA - 2012 Oct 22 KW - Earthquakes KW - Seismic activity KW - Infrasound UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313119529?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=164th+Meeting+of+the+Acoustical+Society+of+America&rft.atitle=Modeling+the+generation+of+infrasound+from+earthquakes&rft.au=Arrowsmith%2C+Stephen%3BBurlacu%2C+Relu%3BPankow%2C+Kristine%3BStump%2C+Brian%3BStead%2C+Richard%3BWhitaker%2C+Rod%3BHayward%2C+Chris&rft.aulast=Arrowsmith&rft.aufirst=Stephen&rft.date=2012-10-22&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=164th+Meeting+of+the+Acoustical+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - http://acousticalsociety.org/sites/default/files/KC_fullweek.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Revisiting elastic anisotropy of biotite gneiss from the Outokumpu scientific drill hole based on new texture measurements and texture-based velocity calculations AN - 1124740811; 2012-094329 AB - A sample of biotite gneiss from the Outokumpu deep drilling project in Finland was investigated by Kern et al. (2008) for crystal preferred orientation and elastic anisotropy. Considerable differences between measured acoustic velocities and velocities calculated on the basis of texture patterns were observed. Measured P-wave anisotropy was 15.1% versus a Voigt average yielding 7.9%. Here we investigate the same sample with different methods and using different averaging techniques. Analyzing time-of-flight neutron diffraction data from Dubna-SKAT and LANSCE-HIPPO diffractometers with the Rietveld technique, much stronger preferred orientation for biotite is determined, compared to conventional pole-figure analysis reported previously. The comparison reveals important differences: HIPPO has much better counting statistics but pole figure coverage is poor. SKAT has better angular resolution. Using the new preferred orientation data and applying a self-consistent averaging method that takes grain shapes into account, close agreement of calculated and measured P-wave velocities is observed (12.6%). This is further improved by adding 0.1 vol.% flat micropores parallel to the biotite platelets in the simulation (14.9%). Abstract Copyright (2012) Elsevier, B.V. JF - Tectonophysics AU - Wenk, H R AU - Vasin, R N AU - Kern, H AU - Matthies, S AU - Vogel, S C AU - Ivankina, T I Y1 - 2012/10/10/ PY - 2012 DA - 2012 Oct 10 SP - 123 EP - 134 PB - Elsevier, Amsterdam VL - 570-571 SN - 0040-1951, 0040-1951 KW - elastic properties KW - Europe KW - simulation KW - preferred orientation KW - Outokumpu Finland KW - metamorphic rocks KW - velocity KW - spectra KW - gneisses KW - bedrock KW - experimental studies KW - Western Europe KW - Finland KW - structural analysis KW - statistical analysis KW - Rietveld refinement KW - models KW - Scandinavia KW - boreholes KW - North Karelia Finland KW - neutron diffraction data KW - crystallization KW - anisotropy KW - acoustical waves KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1124740811?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Tectonophysics&rft.atitle=Revisiting+elastic+anisotropy+of+biotite+gneiss+from+the+Outokumpu+scientific+drill+hole+based+on+new+texture+measurements+and+texture-based+velocity+calculations&rft.au=Wenk%2C+H+R%3BVasin%2C+R+N%3BKern%2C+H%3BMatthies%2C+S%3BVogel%2C+S+C%3BIvankina%2C+T+I&rft.aulast=Wenk&rft.aufirst=H&rft.date=2012-10-10&rft.volume=570-571&rft.issue=&rft.spage=123&rft.isbn=&rft.btitle=&rft.title=Tectonophysics&rft.issn=00401951&rft_id=info:doi/10.1016%2Fj.tecto.2012.06.023 L2 - http://www.sciencedirect.com/science/journal/00401951 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 70 N1 - Document feature - illus. incl. 4 tables N1 - Last updated - 2012-11-01 N1 - CODEN - TCTOAM N1 - SubjectsTermNotLitGenreText - acoustical waves; anisotropy; bedrock; boreholes; crystallization; elastic properties; Europe; experimental studies; Finland; gneisses; metamorphic rocks; models; neutron diffraction data; North Karelia Finland; Outokumpu Finland; preferred orientation; Rietveld refinement; Scandinavia; simulation; spectra; statistical analysis; structural analysis; velocity; Western Europe DO - http://dx.doi.org/10.1016/j.tecto.2012.06.023 ER - TY - JOUR T1 - Identification of New Ligands for the Methionine Biosynthesis Transcriptional Regulator (MetJ) by FAC-MS AN - 1768580945; PQ0002685981 AB - We have developed a high-throughput approach using frontal affinity chromatography coupled to mass spectrometry (FAC-MS) for the identification and characterization of the small molecules that modulate transcriptional regulator (TR) binding to TR targets. We tested this approach using the methionine biosynthesis regulator (MetJ). We used effector mixtures containing S-adenosyl-L-methionine (SAM) and S-adenosyl derivatives as potential ligands for MetJ binding. The differences in the elution time of different compounds allowed us to rank the binding affinity of each compound. Consistent with previous results, FAC-MS showed that SAM binds to MetJ with the highest affinity. In addition, adenine and 5'-deoxy-5'-(methylthio)adenosine bind to the effector binding site on MetJ. Our experiments with MetJ demonstrate that FAC-MS is capable of screening complex mixtures of molecules and identifying high-affinity binders to TRs. In addition, FAC-MS experiments can be used to discriminate between specific and nonspecific binding of the effectors as well as to estimate the dissociation constant (Kd) for effector-TR binding. Copyright copyright 2012 S. Karger AG, Basel JF - Journal of Molecular Microbiology and Biotechnology AU - Mart-Arbona, Ricardo AU - Teshima, Munehiro AU - Anderson, Penelope S AU - Nowak-Lovato, Kristy L AU - Hong-Geller, Elizabeth AU - Unkefer, Clifford J AU - Unkefer, Pat J AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, N. Mex., USA Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 205 EP - 214 PB - S. Karger AG, P.O. Box Basel CH-4009 Switzerland VL - 22 IS - 4 SN - 1464-1801, 1464-1801 KW - Biotechnology and Bioengineering Abstracts KW - Transcriptional regulator KW - Transcriptional regulator effector KW - Methionine biosynthesis KW - Methionine salvage KW - MetJ KW - S-adenosyl-L-methionine KW - 5'-Deoxy-5'-(methylthio)adenosine KW - Adenine KW - Frontal affinity chromatography coupled to mass spectrometry KW - Affinity chromatography KW - Transcription KW - Methionine KW - Mass spectroscopy KW - W 30900:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1768580945?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Molecular+Microbiology+and+Biotechnology&rft.atitle=Identification+of+New+Ligands+for+the+Methionine+Biosynthesis+Transcriptional+Regulator+%28MetJ%29+by+FAC-MS&rft.au=Mart-Arbona%2C+Ricardo%3BTeshima%2C+Munehiro%3BAnderson%2C+Penelope+S%3BNowak-Lovato%2C+Kristy+L%3BHong-Geller%2C+Elizabeth%3BUnkefer%2C+Clifford+J%3BUnkefer%2C+Pat+J&rft.aulast=Mart-Arbona&rft.aufirst=Ricardo&rft.date=2012-10-01&rft.volume=22&rft.issue=4&rft.spage=205&rft.isbn=&rft.btitle=&rft.title=Journal+of+Molecular+Microbiology+and+Biotechnology&rft.issn=14641801&rft_id=info:doi/10.1159%2F000339717 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-02-01 N1 - Last updated - 2016-03-17 N1 - SubjectsTermNotLitGenreText - Affinity chromatography; Adenine; Transcription; Mass spectroscopy; Methionine DO - http://dx.doi.org/10.1159/000339717 ER - TY - JOUR T1 - Entity Disambiguation Using Semantic Networks AN - 1266142806; 201300654 AB - A major stumbling block preventing machines from understanding text is the problem of entity disambiguation. While humans find it easy to determine that a person named in one story is the same person referenced in a second story, machines rely heavily on crude heuristics such as string matching and stemming to make guesses as to whether nouns are coreferent. A key advantage that humans have over machines is the ability to mentally make connections between ideas and, based on these connections, reason how likely two entities are to be the same. Mirroring this natural thought process, we have created a prototype framework for disambiguating entities that is based on connectedness. In this article, we demonstrate it in the practical application of disambiguating authors across a large set of bibliographic records. By representing knowledge from the records as edges in a graph between a subject and an object, we believe that the problem of disambiguating entities reduces to the problem of discovering the most strongly connected nodes in a graph. The knowledge from the records comes in many different forms, such as names of people, date of publication, and themes extracted from the text of the abstract. These different types of knowledge are fused to create the graph required for disambiguation. Furthermore, the resulting graph and framework can be used for more complex operations. [Copyright Wiley Periodicals Inc.] JF - Journal of the American Society for Information Science and Technology AU - Roman, Jorge H AU - Hulin, Kevin J AU - Collins, Linn M AU - Powell, James E AD - Los Alamos National Laboratory, P.O. Box 1163 (MS B295), Los Alamos, NM 87545 jhr@lanl.gov Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 2087 EP - 2099 PB - Wiley Subscription Services, Hoboken NJ VL - 63 IS - 10 SN - 1532-2882, 1532-2882 KW - semantic networks KW - knowledge representation KW - expert systems KW - Automatic text analysis KW - Algorithms KW - Semantic relations KW - Knowledge representation KW - Ambiguity KW - article KW - 13.13: AUTOMATIC TEXT ANALYSIS, AUTOMATIC INDEXING, MACHINE TRANSLATION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1266142806?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+the+American+Society+for+Information+Science+and+Technology&rft.atitle=Entity+Disambiguation+Using+Semantic+Networks&rft.au=Roman%2C+Jorge+H%3BHulin%2C+Kevin+J%3BCollins%2C+Linn+M%3BPowell%2C+James+E&rft.aulast=Roman&rft.aufirst=Jorge&rft.date=2012-10-01&rft.volume=63&rft.issue=10&rft.spage=2087&rft.isbn=&rft.btitle=&rft.title=Journal+of+the+American+Society+for+Information+Science+and+Technology&rft.issn=15322882&rft_id=info:doi/ LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2013-01-01 N1 - Last updated - 2016-09-27 N1 - SubjectsTermNotLitGenreText - Automatic text analysis; Ambiguity; Knowledge representation; Semantic relations; Algorithms ER - TY - JOUR T1 - Uncertainty Quantification for New Approaches to Spent Fuel Assay AN - 1221878837; 17335470 AB - Estimating plutonium (Pu) mass in spent nuclear fuel assemblies (SFAs) helps inspectors ensure that no Pu is diverted. Therefore, nondestructive assay (NDA) methods are being developed to assay Pu mass in SFAs. Uncertainly quantification is an important task in most assay methods, and particularly for SEA assay. A computer model (MCNPX) is being used to predict isotope masses and the spatial distribution of masses in virtual SFAs for 64 combinations of initial fuel enrichment (IE), fuel utilization [burnup (BU)], and cooling time (CT) values. Additional MCNPX modeling for the same 64 virtual SFAs provided the expected detector responses (DRs) for several NDA techniques such as the passive neutron albedo reactivity method and the (252) Cf interrogation with prompt neutrons method. A previous paper describes one uncertainty quantification approach involving Monte Carlo (MC) simulation using individually any of six new NDA options together with IE, BU, and CT. This paper provides an interpretation of the MC approach that is suited for a numerical Bayesian alternative, separately assesses the impact of MCNPX interpolation error, and compares several options to use subsets of IE, BU, CT. and one DR. JF - Nuclear Science and Engineering AU - Burr, Tom AU - Conlin, Jeremy AU - Hu, Jianwei AU - Galloway, Jack AU - Henzl, Vladimir AU - Menlove, Howard AU - Swinhoe, Martyn AU - Tobin, Stephen AU - Trellue, Holly AU - Ulrich, Timothy AD - Los Alamos National Laboratory Statistical Sciences, Los Alamos, New Mexico tburr@lanl.gov Y1 - 2012/10// PY - 2012 DA - Oct 2012 SP - 180 EP - 192 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 172 IS - 2 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Assaying KW - Computer simulation KW - Estimating KW - Fuels KW - Mathematical models KW - Monte Carlo methods KW - Plutonium KW - Uncertainty UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1221878837?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Uncertainty+Quantification+for+New+Approaches+to+Spent+Fuel+Assay&rft.au=Burr%2C+Tom%3BConlin%2C+Jeremy%3BHu%2C+Jianwei%3BGalloway%2C+Jack%3BHenzl%2C+Vladimir%3BMenlove%2C+Howard%3BSwinhoe%2C+Martyn%3BTobin%2C+Stephen%3BTrellue%2C+Holly%3BUlrich%2C+Timothy&rft.aulast=Burr&rft.aufirst=Tom&rft.date=2012-10-01&rft.volume=172&rft.issue=2&rft.spage=180&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-12-01 N1 - Number of references - 20 N1 - Last updated - 2012-12-05 ER - TY - JOUR T1 - Reconnaissance lead isotope characteristics of the Blackbird Deposit; implications for the age and origin of cobalt-copper mineralization in the Idaho cobalt belt, United States AN - 1151916024; 2012-101491 AB - Strata-bound cobalt-copper deposits occur in the metasedimentary rocks of the Apple Creek Formation (Mesoproterozoic) in a linear belt called the Idaho cobalt belt, near Salmon, Idaho. We report the first set of lead isotope measurements on silicate rocks and sulfide ores and new sulfur isotope data on sulfide ores. The Pb isotope compositions of cobalt-copper (Co-Cu) ores ( (super 206) Pb/ (super 204) Pb = 30.8-40.4; (super 207) Pb/ (super 204) Pb = 16.8-17.6; (super 208) Pb/ (super 204) Pb = 49.7-63.9) are very radiogenic, much more radiogenic than any known sedimentary exhalative (sedex) deposits. The data plot well beyond the crustal growth model curves, a feature shared by the Mississippi Valley-type (MVT) deposits which is characteristic of an upper crustal source. It is unlikely that the ore lead could have come from any mafic igneous source of mantle origin (Proterozoic Moyie sill and its equivalent, or the Tertiary Challis Volcanic Group). The Cretaceous felsic igneous rocks of the region (the Idaho batholith and related rocks) also have much lower Pb isotope ratios than the Co-Cu ores. The Pb isotope ratios of Proterozoic crystalline rocks partially overlap Pb isotope ratios of the Apple Creek Formation but would have been much less radiogenic than the ores at an assumed mineralization age of about 1400 Ma. Only the host Apple Creek Formation is known to have appropriate Pb isotope compositions ( (super 206) Pb/ (super 204) Pb = 26.8-86.7; (super 207) Pb/ (super 204) Pb = 16.3-21.1; (super 208) Pb/ (super 204) Pb = 47.9-64.8) to be the source of Co-Cu ores. Leaching of metals from the host sedimentary sequence by hydrothermal fluids and subsequent deposition of ores at chemically and structurally favorable sites could have resulted in the formation of Co-Cu deposits in the Idaho cobalt belt. JF - Economic Geology and the Bulletin of the Society of Economic Geologists AU - Panneerselvam, K AU - MacFarlane, Andrew W AU - Salters, Vincent J M Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 1177 EP - 1188 PB - Economic Geology Publishing Company, Lancaster, PA VL - 107 IS - 6 SN - 0361-0128, 0361-0128 KW - United States KW - mineral deposits, genesis KW - Blackbird Deposit KW - upper Precambrian KW - stratabound deposits KW - isotopes KW - lead KW - stable isotopes KW - Cenozoic KW - Apple Creek Formation KW - Challis Volcanics KW - radioactive isotopes KW - Idaho cobalt belt KW - mineralization KW - copper ores KW - Pb-207/Pb-204 KW - Idaho KW - Precambrian KW - Pb-206/Pb-204 KW - isotope ratios KW - cobalt ores KW - Proterozoic KW - isochrons KW - Tertiary KW - S-34/S-32 KW - metals KW - metal ores KW - sulfur KW - Pb-208/Pb-204 KW - 27A:Economic geology, geology of ore deposits KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151916024?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Economic+Geology+and+the+Bulletin+of+the+Society+of+Economic+Geologists&rft.atitle=Reconnaissance+lead+isotope+characteristics+of+the+Blackbird+Deposit%3B+implications+for+the+age+and+origin+of+cobalt-copper+mineralization+in+the+Idaho+cobalt+belt%2C+United+States&rft.au=Panneerselvam%2C+K%3BMacFarlane%2C+Andrew+W%3BSalters%2C+Vincent+J+M&rft.aulast=Panneerselvam&rft.aufirst=K&rft.date=2012-10-01&rft.volume=107&rft.issue=6&rft.spage=1177&rft.isbn=&rft.btitle=&rft.title=Economic+Geology+and+the+Bulletin+of+the+Society+of+Economic+Geologists&rft.issn=03610128&rft_id=info:doi/10.2113%2Fecongeo.107.6.1177 L2 - http://www.segweb.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 67 N1 - PubXState - PA N1 - Document feature - illus. incl. 2 tables, geol. sketch map N1 - SuppNotes - Includes appendix N1 - Last updated - 2012-11-15 N1 - CODEN - ECGLAL N1 - SubjectsTermNotLitGenreText - Apple Creek Formation; Blackbird Deposit; Cenozoic; Challis Volcanics; cobalt ores; copper ores; Idaho; Idaho cobalt belt; isochrons; isotope ratios; isotopes; lead; metal ores; metals; mineral deposits, genesis; mineralization; Pb-206/Pb-204; Pb-207/Pb-204; Pb-208/Pb-204; Precambrian; Proterozoic; radioactive isotopes; S-34/S-32; stable isotopes; stratabound deposits; sulfur; Tertiary; United States; upper Precambrian DO - http://dx.doi.org/10.2113/econgeo.107.6.1177 ER - TY - JOUR T1 - Conditions and processes affecting radionuclide transport AN - 1151912864; 2012-101404 AB - Characteristics of host rocks, secondary minerals, and fluids would affect the transport of radionuclides from a previously proposed repository at Yucca Mountain, Nevada. Minerals in the Yucca Mountain tuffs that are important for retarding radionuclides include clinoptilolite and mordenite (zeolites), clay minerals, and iron and manganese oxides and hydroxides. Water compositions along flow paths beneath Yucca Mountain are controlled by dissolution reactions, silica and calcite precipitation, and ion-exchange reactions. Radionuclide concentrations along flow paths from a repository could be limited by (1) low waste-form dissolution rates, (2) low radionuclide solubility, and (3) radionuclide sorption onto geological media. The chief sources of radioactivity in spent nuclear fuel are americium, plutonium, and neptunium. Therefore, studies have concentrated on their geochemical mobility. Uranium-233, uranium-234, iodine-129, technetium-99, and other radionuclides also have been included in some experiments. Solubilities were determined experimentally in representative Yucca Mountain waters. Sorption coefficients were determined using water, rock, and pure mineral samples from Yucca Mountain. Batch experiments were performed at several pH levels and oxidizing conditions. Dynamic transport-column experiments, diffusion experiments, and solid-rock beaker experiments also were conducted. The batch tests gave slightly lower retardation factors than those derived from column-breakthrough experiments. This finding indicates that using batch-sorption coefficients to predict radionuclide transport will yield conservative results in a performance assessment. Understanding of unsaturated-zone transport is based on laboratory and field-scale experiments. Fractures provide advective transport pathways. Sorption and matrix diffusion may contribute to retardation of radionuclides. Conversely, sorption onto mobile colloids may enhance radionuclide transport. JF - Memoir - Geological Society of America AU - Simmons, Ardyth M AU - Neymark, Leonid A Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 277 EP - 362 PB - Geological Society of America (GSA), Boulder, CO VL - 209 SN - 0072-1069, 0072-1069 KW - calcium KW - sorption KW - radioactivity KW - halogens KW - unsaturated zone KW - radioactive waste KW - pump tests KW - iodine KW - mineral composition KW - chloride ion KW - carbon KW - Yucca Mountain KW - pH KW - processes KW - technetium KW - anions KW - colloidal materials KW - sulfate ion KW - C-13/C-12 KW - solubility KW - Nye County Nevada KW - Tertiary KW - cations KW - uranium KW - waste disposal KW - SEM data KW - United States KW - isotopes KW - solution KW - stable isotopes KW - ground water KW - Cenozoic KW - controls KW - radioactive isotopes KW - I-129 KW - chemical reactions KW - transport KW - geochemical anomalies KW - rare earths KW - europium KW - geochemistry KW - Nevada KW - Eh KW - chlorine KW - alkaline earth metals KW - isotope ratios KW - oxidation KW - host rocks KW - alkali metals KW - Tc-99 KW - sodium KW - hydrochemistry KW - Miocene KW - precipitation KW - Neogene KW - metals KW - U-234 KW - U-233 KW - actinides KW - Paintbrush Tuff KW - 21:Hydrogeology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151912864?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Memoir+-+Geological+Society+of+America&rft.atitle=Conditions+and+processes+affecting+radionuclide+transport&rft.au=Simmons%2C+Ardyth+M%3BNeymark%2C+Leonid+A&rft.aulast=Simmons&rft.aufirst=Ardyth&rft.date=2012-10-01&rft.volume=209&rft.issue=&rft.spage=277&rft.isbn=9780813712093&rft.btitle=&rft.title=Memoir+-+Geological+Society+of+America&rft.issn=00721069&rft_id=info:doi/10.1130%2F2012.1209%2806%29 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 277 N1 - PubXState - CO N1 - Document feature - illus. incl. block diags., 22 tables, sketch maps N1 - Last updated - 2012-11-15 N1 - CODEN - GSAMAQ N1 - SubjectsTermNotLitGenreText - actinides; alkali metals; alkaline earth metals; anions; C-13/C-12; calcium; carbon; cations; Cenozoic; chemical reactions; chloride ion; chlorine; colloidal materials; controls; Eh; europium; geochemical anomalies; geochemistry; ground water; halogens; host rocks; hydrochemistry; I-129; iodine; isotope ratios; isotopes; metals; mineral composition; Miocene; Neogene; Nevada; Nye County Nevada; oxidation; Paintbrush Tuff; pH; precipitation; processes; pump tests; radioactive isotopes; radioactive waste; radioactivity; rare earths; SEM data; sodium; solubility; solution; sorption; stable isotopes; sulfate ion; Tc-99; technetium; Tertiary; transport; U-233; U-234; United States; unsaturated zone; uranium; waste disposal; Yucca Mountain DO - http://dx.doi.org/10.1130/2012.1209(06) ER - TY - JOUR T1 - Rigid bounds on heat transport by a fluid between slippery boundaries AN - 1701478780; PQ0001682038 AB - Rigorous bounds on heat transport are derived for thermal convection between stress-free horizontal plates. For three-dimensional Rayleigh-Benard convection at infinite Prandtl number ( $\mathit{Pr}$ ), the Nusselt number ( $\mathit{Nu}$ ) is bounded according to $\mathit{Nu}\leq 0. 28764{\mathit{Ra}} super({5/ 12}) $ where $\mathit{Ra}$ is the standard Rayleigh number. For convection driven by a uniform steady internal heat source between isothermal boundaries, the spatially and temporally averaged (non-dimensional) temperature is bounded from below by $\langle T\rangle \geq 0. 6910{\mathit{R}} super({\ensuremath{-} 5/ 17}) $ in three dimensions at infinite $\mathit{Pr}$ and by $\langle T\rangle \geq 0. 8473{\mathit{R}} super({\ensuremath{-} 5/ 17}) $ in two dimensions at arbitrary $\mathit{Pr}$ , where $\mathit{R}$ is the heat Rayleigh number proportional to the injected flux. JF - Journal of Fluid Mechanics AU - Whitehead, Jared P AU - Doering, Charles R AD - Department of Mathematics, University of Michigan, Ann Arbor, MI 48109-1043, USA, whitehead@lanl.gov Y1 - 2012/09/25/ PY - 2012 DA - 2012 Sep 25 SP - 241 EP - 259 PB - Cambridge University Press, The Edinburgh Building, Cambridge CB2 2RU United Kingdom VL - 707 SN - 0022-1120, 0022-1120 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Convection KW - Temperature KW - Prandtl number KW - Fluid Mechanics KW - Fluid mechanics KW - Heat KW - Boundaries KW - Standards KW - Cellular convection KW - Fluctuations KW - Heat transport KW - SW 0810:General KW - Q2 09183:Physics and chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1701478780?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Fluid+Mechanics&rft.atitle=Rigid+bounds+on+heat+transport+by+a+fluid+between+slippery+boundaries&rft.au=Whitehead%2C+Jared+P%3BDoering%2C+Charles+R&rft.aulast=Whitehead&rft.aufirst=Jared&rft.date=2012-09-25&rft.volume=707&rft.issue=&rft.spage=241&rft.isbn=&rft.btitle=&rft.title=Journal+of+Fluid+Mechanics&rft.issn=00221120&rft_id=info:doi/10.1017%2Fjfm.2012.274 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-08-01 N1 - Last updated - 2016-02-04 N1 - SubjectsTermNotLitGenreText - Fluid mechanics; Convection; Prandtl number; Cellular convection; Heat transport; Heat; Temperature; Boundaries; Standards; Fluctuations; Fluid Mechanics DO - http://dx.doi.org/10.1017/jfm.2012.274 ER - TY - JOUR T1 - Uplift prior to continental breakup; indication for removal of mantle lithosphere? AN - 1112670815; 2012-088873 AB - Uplift or reduced subsidence prior to continental breakup is a key component of the rift-drift transition. This uplift causes lateral variations in the lithospheric potential energy, which can increase intraplate deviatoric tension, thereby facilitating continental rupture. There is a growing body of evidence that pre-breakup uplift is a global phenomenon characteristic of magmatic and magma-poor rifted margins. Evidence is provided by the subaerial extrusion of lava interpreted from drill logs, stratigraphic records, the presence of breakup unconformities, and the spatial extent of uplift associated with Afar (the Ethiopian-Somali plateau), which may be at the stage of rupture. Previously discussed mechanisms contributing to this uplift include phase transitions, dynamic uplift from mantle plumes, and magmatic underplated bodies. We show in this study that dynamic uplift resulting from passive upwelling asthenosphere below the rift is limited ( approximately 200 m). Isostatic arguments suggest that removal of mantle lithosphere is a necessary and effective mechanism for uplift coincident with rupture. The combination of mantle phase transitions and a very thin mantle lid produces an excess potential energy state (as evidenced by a positive geoid anomaly) and leads to tensional forces favorable for rupture. These results underpin our proposed model for continental breakup where removal of mantle lithosphere by either detachment or formation of gravitational instabilities is a characteristic process. Observations of depth-dependent thinning and geochemical data support this model. JF - Geosphere AU - Esedo, Raphael AU - van Wijk, Jolante AU - Coblentz, David D AU - Meyer, Romain Y1 - 2012/09/19/ PY - 2012 DA - 2012 Sep 19 SP - 1078 EP - 1085 PB - Geological Society of America, Boulder, CO VL - 8 IS - 5 KW - processes KW - upwelling KW - lithosphere KW - magmatism KW - global KW - uplifts KW - stress KW - mechanism KW - mantle KW - subsidence KW - rifting KW - extension tectonics KW - models KW - asthenosphere KW - geodynamics KW - plate tectonics KW - intraplate processes KW - tectonics KW - tension KW - mantle plumes KW - crust KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1112670815?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geosphere&rft.atitle=Uplift+prior+to+continental+breakup%3B+indication+for+removal+of+mantle+lithosphere%3F&rft.au=Esedo%2C+Raphael%3Bvan+Wijk%2C+Jolante%3BCoblentz%2C+David+D%3BMeyer%2C+Romain&rft.aulast=Esedo&rft.aufirst=Raphael&rft.date=2012-09-19&rft.volume=8&rft.issue=5&rft.spage=1078&rft.isbn=&rft.btitle=&rft.title=Geosphere&rft.issn=1553-040X&rft_id=info:doi/10.1130%2FGES00748.1 L2 - http://www.gsajournals.org/perlserv/?request=get-archive&issn=1553-040X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 60 N1 - PubXState - CO N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-10-18 N1 - SubjectsTermNotLitGenreText - asthenosphere; crust; extension tectonics; geodynamics; global; intraplate processes; lithosphere; magmatism; mantle; mantle plumes; mechanism; models; plate tectonics; processes; rifting; stress; subsidence; tectonics; tension; uplifts; upwelling DO - http://dx.doi.org/10.1130/GES00748.1 ER - TY - JOUR T1 - New incision rates along the Colorado River system based on cosmogenic burial dating of terraces; implications for regional controls on Quaternary incision AN - 1112670797; 2012-088871 AB - New cosmogenic burial and published dates of Colorado and Green river terraces are used to infer variable incision rates along the rivers in the past 10 Ma. A knickpoint at Lees Ferry separates the lower and upper Colorado River basins. We obtained an isochron cosmogenic burial date of 1.5+ or -0.13 Ma on a 190-m-high strath terrace near Bullfrog Basin, Utah (upstream of Lees Ferry). This age yields an average incision rate of 126 +12/-10 m/Ma above the knickpoint and is three times older than a cosmogenic surface age on the same terrace, suggesting that surface dates inferred by exposure dating may be minimum ages. Incision rates below Lees Ferry are faster, approximately 170 m/Ma-230 m/Ma, suggesting upstream knickpoint migration over the past several million years. A terrace at Hite (above Lees Ferry) yields an isochron burial age of 0.29+ or -0.17 Ma, and a rate of approximately 300-900 m/Ma, corroborating incision acceleration in Glen Canyon. Within the upper basin, isochron cosmogenic burial dates of 1.48+ or -0.12 Ma on a 60 m terrace near the Green River in Desolation Canyon, Utah, and 1.2+ or -0.3 Ma on a 120 m terrace upstream of Flaming Gorge, Wyoming, give incision rates of 41+ or -3 m/Ma and 100 +33/-20 m/Ma, respectively. In contrast, incision rates along the upper Colorado River are 150 m/Ma over 0.64 and 10 Ma time frames. Higher incision rates, gradient, and discharge along the upper Colorado River relative to the Green River are consistent with differential rock uplift of the Colorado Rockies relative to the Colorado Plateau. JF - Geosphere AU - Darling, Andrew L AU - Karlstrom, Karl E AU - Granger, Darryl E AU - Aslan, Andres AU - Kirby, Eric AU - Ouimet, William B AU - Lazear, Gregory D AU - Coblentz, David D AU - Cole, Rex D Y1 - 2012/09/19/ PY - 2012 DA - 2012 Sep 19 SP - 1020 EP - 1041 PB - Geological Society of America, Boulder, CO VL - 8 IS - 5 KW - United States KW - isotopes KW - erosion rates KW - terraces KW - burial KW - Colorado River KW - Cenozoic KW - Al-26 KW - spatial variations KW - radioactive isotopes KW - aluminum KW - absolute age KW - alkaline earth metals KW - Quaternary KW - Be-10 KW - landform evolution KW - rates KW - rivers KW - Wyoming KW - Green River KW - metals KW - fluvial features KW - Utah KW - geomorphology KW - Colorado KW - beryllium KW - 23:Geomorphology KW - 03:Geochronology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1112670797?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geosphere&rft.atitle=New+incision+rates+along+the+Colorado+River+system+based+on+cosmogenic+burial+dating+of+terraces%3B+implications+for+regional+controls+on+Quaternary+incision&rft.au=Darling%2C+Andrew+L%3BKarlstrom%2C+Karl+E%3BGranger%2C+Darryl+E%3BAslan%2C+Andres%3BKirby%2C+Eric%3BOuimet%2C+William+B%3BLazear%2C+Gregory+D%3BCoblentz%2C+David+D%3BCole%2C+Rex+D&rft.aulast=Darling&rft.aufirst=Andrew&rft.date=2012-09-19&rft.volume=8&rft.issue=5&rft.spage=1020&rft.isbn=&rft.btitle=&rft.title=Geosphere&rft.issn=1553-040X&rft_id=info:doi/10.1130%2FGES00724.1 L2 - http://www.gsajournals.org/perlserv/?request=get-archive&issn=1553-040X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 98 N1 - PubXState - CO N1 - Document feature - illus. incl. 2 tables, geol. sketch map N1 - Last updated - 2012-10-18 N1 - SubjectsTermNotLitGenreText - absolute age; Al-26; alkaline earth metals; aluminum; Be-10; beryllium; burial; Cenozoic; Colorado; Colorado River; erosion rates; fluvial features; geomorphology; Green River; isotopes; landform evolution; metals; Quaternary; radioactive isotopes; rates; rivers; spatial variations; terraces; United States; Utah; Wyoming DO - http://dx.doi.org/10.1130/GES00724.1 ER - TY - JOUR T1 - Using a reactive transport model to elucidate differences between laboratory and field dissolution rates in regolith AN - 1282821269; 2013-013476 AB - The reactive transport model FLOTRAN was used to forward-model weathering profiles developed on granitic outwash alluvium over 40-3000 ka from the Merced, California (USA) chronosequence as well as deep granitic regolith developed over 800 ka near Davis Run, Virginia (USA). Baseline model predictions that used laboratory rate constants (k (sub m) ), measured fluid flow velocities (v), and BET volumetric surface areas for the parent material (A (sub B,m) (super o) ) were not consistent with measured profiles of plagioclase, potassium feldspar, and quartz. Reaction fronts predicted by the baseline model are deeper and thinner than the observed, consistent with faster rates of reaction in the model. Reaction front depth in the model depended mostly upon saturated versus unsaturated hydrologic flow conditions, rate constants controlling precipitation of secondary minerals, and the average fluid flow velocity (v (sub a) ). Unsaturated hydrologic flow conditions (relatively open with respect to CO (sub 2(g)) ) resulted in the prediction of deeper reaction fronts and significant differences in the separation between plagioclase and potassium feldspar reaction fronts compared to saturated hydrologic flow (relatively closed with respect to CO (sub 2(g)) ). Under saturated or unsaturated flow conditions, the rate constant that controls precipitation rates of secondary minerals must be reduced relative to laboratory rate constants to match observed reaction front depths and measured pore water chemistry. Additionally, to match the observed reaction front depths, v (sub a) was set lower than the measured value, v, for three of the four profiles. The reaction front gradients in mineralogy and pore fluid chemistry could only be modeled accurately by adjusting values of the product k (sub m) A (sub B,m) (super o) . By assuming k (sub m) values were constrained by laboratory data, field observations were modeled successfully with TST-like rate equations by dividing measured values of A (sub B,m) (super o) by factors from 50 to 1700. Alternately, with sigmoidal or Al-inhibition rate models, this adjustment factor ranges from 5 to 170. Best-fit models of the wetter, hydrologically saturated Davis Run profile required a smaller adjustment to A (sub B,m) (super o) than the drier hydrologically unsaturated Merced profiles. We attributed the need for large adjustments in v (sub a) and A (sub B,m) (super o) necessary for the Merced models to more complex hydrologic flow that decreased the reactive surface area in contact with bulk flow water, e.g., dead-end pore spaces containing fluids that are near or at chemical equilibrium. Thus, rate models from the laboratory can successfully predict weathering over millions of years, but work is needed to understand how to incorporate changes in what controls the relationship between reactive surface area and hydrologic flow. Abstract Copyright (2012) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Moore, Joel AU - Lichtner, Peter C AU - White, Art F AU - Brantley, Susan L Y1 - 2012/09/15/ PY - 2012 DA - 2012 Sep 15 SP - 235 EP - 261 PB - Elsevier, New York, NY VL - 93 SN - 0016-7037, 0016-7037 KW - United States KW - solute transport KW - last glacial maximum KW - oxygen KW - isotopes KW - igneous rocks KW - granites KW - unsaturated zone KW - paleoclimatology KW - stable isotopes KW - Davis Run KW - ground water KW - Cenozoic KW - California KW - laboratory studies KW - reactivity KW - plutonic rocks KW - chemical reactions KW - transport KW - phase equilibria KW - paleotemperature KW - movement KW - thermodynamic properties KW - chemical composition KW - kinetics KW - hydrology KW - bedrock KW - Virginia KW - Quaternary KW - secondary minerals KW - paleohydrology KW - isotope ratios KW - prediction KW - O-18/O-16 KW - hydrochemistry KW - evapotranspiration KW - models KW - paleoenvironment KW - precipitation KW - parent materials KW - Merced County California KW - crystal chemistry KW - regolith KW - pore water KW - field studies KW - 24:Quaternary geology KW - 02B:Hydrochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282821269?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Using+a+reactive+transport+model+to+elucidate+differences+between+laboratory+and+field+dissolution+rates+in+regolith&rft.au=Moore%2C+Joel%3BLichtner%2C+Peter+C%3BWhite%2C+Art+F%3BBrantley%2C+Susan+L&rft.aulast=Moore&rft.aufirst=Joel&rft.date=2012-09-15&rft.volume=93&rft.issue=&rft.spage=235&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2012.03.021 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 60 N1 - PubXState - NY N1 - Document feature - illus. incl. 6 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-02-05 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - bedrock; California; Cenozoic; chemical composition; chemical reactions; crystal chemistry; Davis Run; evapotranspiration; field studies; granites; ground water; hydrochemistry; hydrology; igneous rocks; isotope ratios; isotopes; kinetics; laboratory studies; last glacial maximum; Merced County California; models; movement; O-18/O-16; oxygen; paleoclimatology; paleoenvironment; paleohydrology; paleotemperature; parent materials; phase equilibria; plutonic rocks; pore water; precipitation; prediction; Quaternary; reactivity; regolith; secondary minerals; solute transport; stable isotopes; thermodynamic properties; transport; United States; unsaturated zone; Virginia DO - http://dx.doi.org/10.1016/j.gca.2012.03.021 ER - TY - JOUR T1 - Pathline tracing on fully unstructured control-volume grids AN - 1832584856; 655010-16 AB - The trend toward unstructured grids in subsurface flow modeling has prompted interest in the issue of streamline or pathline tracing on unstructured grids. Streamline tracing on unstructured grids is problematic because a continuous velocity field is required for the calculation, while numerical solutions to the groundwater flow equations provide velocity in discretized form only. A method for calculating flow streamlines or pathlines from a finite-volume flow solution is presented. The method uses an unconstrained least squares method on interior cells and a constrained least squares method on boundary cells to approximate cell-centered velocities, which can then be continuously interpolated to any point in the domain of interest. Two-dimensional tests demonstrate that the method correctly reproduces uniform and corner-to-corner flow on fully unstructured grids. In three dimensions using regular hexahedral grids, the method agrees well with established semianalytical methods. Tests also demonstrate that the method produces physically realistic results on fully unstructured three-dimensional grids. Copyright 2012 Springer Science+Business Media B.V. and Springer Science+Business Media B.V. (outside the USA) JF - Computational Geosciences AU - Painter, S L AU - Gable, C W AU - Kelkar, S Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 1125 EP - 1134 PB - Springer, Dordrecht VL - 16 IS - 4 SN - 1420-0597, 1420-0597 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832584856?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computational+Geosciences&rft.atitle=Pathline+tracing+on+fully+unstructured+control-volume+grids&rft.au=Painter%2C+S+L%3BGable%2C+C+W%3BKelkar%2C+S&rft.aulast=Painter&rft.aufirst=S&rft.date=2012-09-01&rft.volume=16&rft.issue=4&rft.spage=1125&rft.isbn=&rft.btitle=&rft.title=Computational+Geosciences&rft.issn=14200597&rft_id=info:doi/10.1007%2Fs10596-012-9307-1 L2 - http://www.springerlink.com/content/101744/ LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 DO - http://dx.doi.org/10.1007/s10596-012-9307-1 ER - TY - JOUR T1 - Linking pore-scale interfacial curvature to column-scale capillary pressure AN - 1502296176; 2014-013613 AB - Synchrotron-based tomographic datasets of oil-water drainage and imbibition cycles have been analyzed to quantify phase saturations and interfacial curvature as well as connected and disconnected fluid configurations. This allows for close observation of the drainage and imbibition processes, assessment of equilibrium states, and studying the effects of fluid phase disconnection and reconnection on the resulting capillary pressures and interfacial curvatures. Based on this analysis estimates of capillary pressure calculated from interfacial curvature can be compared to capillary pressure measured externally with a transducer. Results show good agreement between curvature-based and transducer-based measurements when connected phase interfaces are considered. Curvature measurements show a strong dependence on whether an interface is formed by connected or disconnected fluid and the time allowed for equilibration. The favorable agreement between curvature-based and transducer-based capillary pressure measurements shows promise for the use of image-based estimates of capillary pressure for interfaces that cannot be probed with external transducers as well as opportunities for a detailed assessment of interfacial curvature during drainage and imbibition. JF - Advances in Water Resources AU - Armstrong, Ryan T AU - Porter, Mark L AU - Wildenschild, Dorthe Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 55 EP - 62 PB - Elsevier, Oxford VL - 46 SN - 0309-1708, 0309-1708 KW - tomography KW - imagery KW - capillary pressure KW - drainage KW - connectivity KW - fluid flow KW - porous materials KW - oil-water interface KW - Laplace transformations KW - equilibrium KW - porosity KW - measurement KW - imbibition KW - errors KW - computed tomography KW - saturation KW - transducers KW - synchrotrons KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1502296176?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Advances+in+Water+Resources&rft.atitle=Linking+pore-scale+interfacial+curvature+to+column-scale+capillary+pressure&rft.au=Armstrong%2C+Ryan+T%3BPorter%2C+Mark+L%3BWildenschild%2C+Dorthe&rft.aulast=Armstrong&rft.aufirst=Ryan&rft.date=2012-09-01&rft.volume=46&rft.issue=&rft.spage=55&rft.isbn=&rft.btitle=&rft.title=Advances+in+Water+Resources&rft.issn=03091708&rft_id=info:doi/10.1016%2Fj.advwatres.2012.05.009 L2 - http://www.sciencedirect.com/science/journal/03091708 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2014-01-01 N1 - Number of references - 20 N1 - Document feature - illus. N1 - Last updated - 2014-02-27 N1 - SubjectsTermNotLitGenreText - capillary pressure; computed tomography; connectivity; drainage; equilibrium; errors; fluid flow; imagery; imbibition; Laplace transformations; measurement; oil-water interface; porosity; porous materials; saturation; synchrotrons; tomography; transducers DO - http://dx.doi.org/10.1016/j.advwatres.2012.05.009 ER - TY - JOUR T1 - A Perspective on Resource Synchronization AN - 1347769984; 201304448 AB - Web applications frequently leverage resources made available by remote web servers. As resources are created, updated, deleted, or moved, these applications face challenges to remain in lockstep with changes on the server. Several approaches exist to help meet this challenge for use cases where 'good enough' synchronization is acceptable. But when strict resource coverage or low synchronization latency is required, commonly accepted Web-based solutions remain elusive. This paper provides a perspective on the resource synchronization problem that results from inspiration gained from prior work, and initial insights resulting from the recently launched NISO/OAI ResourceSync effort. Adapted from the source document. JF - D-Lib Magazine AU - Van de Sompel, Herbert AU - Sanderson, Robert AU - Klein, Martin AU - Nelson, Michael L AU - Haslhofer, Bernhard AU - Warner, Simeon AU - Lagoze, Carl AD - Los Alamos National Laboratory herbertv@lanl.gov Y1 - 2012/09// PY - 2012 DA - September 2012 PB - Corporation for National Research Initiatives, Reston, VA VL - 18 IS - 9-10 SN - 1082-9873, 1082-9873 KW - Software KW - Change KW - Client server networks KW - Digital archives KW - World Wide Web KW - article KW - 14.11: COMMUNICATIONS AND INFORMATION TECHNOLOGY - NETWORKS UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1347769984?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=D-Lib+Magazine&rft.atitle=A+Perspective+on+Resource+Synchronization&rft.au=Van+de+Sompel%2C+Herbert%3BSanderson%2C+Robert%3BKlein%2C+Martin%3BNelson%2C+Michael+L%3BHaslhofer%2C+Bernhard%3BWarner%2C+Simeon%3BLagoze%2C+Carl&rft.aulast=Van+de+Sompel&rft.aufirst=Herbert&rft.date=2012-09-01&rft.volume=18&rft.issue=9-10&rft.spage=&rft.isbn=&rft.btitle=&rft.title=D-Lib+Magazine&rft.issn=10829873&rft_id=info:doi/ L2 - http://www.dlib.org LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2013-05-01 N1 - Last updated - 2016-09-27 N1 - CODEN - DLMAF7 N1 - SubjectsTermNotLitGenreText - Software; Client server networks; World Wide Web; Change; Digital archives ER - TY - JOUR T1 - Greenland Freshwater Runoff. Part II: Distribution and Trends, 1960-2010 AN - 1093458450; 17173625 AB - Runoff magnitudes, the spatial patterns from individual Greenland catchments, and their changes through time (1960-2010) were simulated in an effort to understand runoff variations to adjacent seas and to illustrate the capability of SnowModel (a snow and ice evolution model) and HydroFlow (a runoff routing model) to link variations in terrestrial runoff with ocean processes and other components of Earth's climate system. Significant increases in air temperature, net precipitation, and local surface runoff lead to enhanced and statistically significant Greenland ice sheet (GrIS) surface mass balance (SMB) loss. Total Greenland runoff to the surrounding oceans increased 30%, averaging 481 plus or minus 85 km super(3) yr super(-1). Averaged over the period, 69% of the runoff to the surrounding seas originated from the GrIS and 31% came from outside the GrIS from rain and melting glaciers and ice caps. The runoff increase from the GrIS was due to an 87% increase in melt extent, 18% from increases in melt duration, and a 5% decrease in melt rates (87% + 18% - 5% = 100%). In contrast, the runoff increase from the land area surrounding the GrIS was due to a 0% change in melt extent, a 108% increase in melt duration, and an 8% decrease in melt rate. In general, years with positive Atlantic multidecadal oscillation (AMO) index equaled years with relatively high Greenland runoff volume and vice versa. Regionally, runoff was greater from western than eastern Greenland. Since 1960, the data showed pronounced runoff increases in west Greenland, with the greatest increase occurring in the southwest and the lowest increase in the northwest. JF - Journal of Climate AU - Mernild, Sebastian H AU - Liston, Glen E AD - Climate, Ocean, and Sea Ice Modeling Group, Computational Physics and Methods, Los Alamos National Laboratory, Los Alamos, New Mexico Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 6015 EP - 6035 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 25 IS - 17 SN - 0894-8755, 0894-8755 KW - Meteorological & Geoastrophysical Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality; ASFA 2: Ocean Technology Policy & Non-Living Resources; Sustainability Science Abstracts; Environment Abstracts KW - Catchment area KW - Glacial runoff KW - Spatial distribution KW - ANE, Greenland, Oestgroenland KW - Rainfall KW - Glaciers KW - Climate change KW - Greenland ice sheet KW - Air temperature KW - Marginal seas KW - Catchment basins KW - Lead isotopes in snow KW - Ocean-atmosphere system KW - Surface runoff KW - Ice caps KW - AN, Greenland KW - Marine KW - Ice KW - Climate models KW - PN, Greenland, Greenland Ice Sheet KW - Snow KW - Precipitation KW - Sea ice KW - Oceans KW - Catchments KW - Glaciation KW - Rainfall-runoff modeling KW - Runoff KW - M2 551.324:Land Ice/Glaciers (551.324) KW - M3 1010:Issues in Sustainable Development KW - Q5 08502:Methods and instruments KW - Q2 09150:Ice KW - ENA 12:Oceans & Estuaries UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1093458450?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aasfaaquaticpollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Climate&rft.atitle=Greenland+Freshwater+Runoff.+Part+II%3A+Distribution+and+Trends%2C+1960-2010&rft.au=Mernild%2C+Sebastian+H%3BListon%2C+Glen+E&rft.aulast=Mernild&rft.aufirst=Sebastian&rft.date=2012-09-01&rft.volume=25&rft.issue=17&rft.spage=6015&rft.isbn=&rft.btitle=&rft.title=Journal+of+Climate&rft.issn=08948755&rft_id=info:doi/10.1175%2FJCLI-D-11-00592.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Number of references - 65 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Catchment area; Marginal seas; Sea ice; Climate change; Glaciation; Ocean-atmosphere system; Ice caps; Air temperature; Runoff; Glacial runoff; Climate models; Catchment basins; Lead isotopes in snow; Greenland ice sheet; Surface runoff; Rainfall-runoff modeling; Precipitation; Ice; Spatial distribution; Snow; Rainfall; Oceans; Glaciers; Catchments; PN, Greenland, Greenland Ice Sheet; ANE, Greenland, Oestgroenland; AN, Greenland; Marine DO - http://dx.doi.org/10.1175/JCLI-D-11-00592.1 ER - TY - JOUR T1 - Spectral analysis of observed aquifer water level fluctuations AN - 1080610659; 2012-086177 AB - A mathematical model is presented that describes small, periodic, water level perturbations in a fully screened observation well penetrating a homogeneous, isotropic, confined aquifer system. The analytical solution is formulated in terms of frequency and phase response functions that are controlled by aquifer transmissivity (T) and storage coefficient (S). Well casing storage effects are considered; however, well screen entrance losses associated with turbulence are neglected because piezometric head differences inside and outside the well are small. As the ratio of well casing radius to well screen radius (r (sub c) /r (sub w) ) changes, these theoretical response functions are systematically altered. When r (sub c) /r (sub w) 0 and system responses associated with differences in T and S are accentuated. For (r (sub c) /r (sub w) )> or =1, however, distinguishing between system responses is more complicated because well casing storage effects gradually dominate water level perturbations as r (sub c) /r (sub w) grows. Finally, in practical applications for any r (sub c) /r (sub w) value, obtaining unique estimates for T and S can be difficult in the presence of noise without the improved Levenberg-Marquardt (LM) optimization scheme developed here. Initially, a sigmoidal curve fitting algorithm and observed frequency and phase response functions are used to identify a starting estimate for T. This value is then used in the LM procedure and facilitates convergence to optimal system parameters while minimizing uncertainty. Without this approach, however, the LM scheme will not yield unique estimates. This methodology yields smaller aquifer parameters than traditional specific capacity tests, suggesting either a well bore skin effect or a scaling phenomenon similar to that reported in the literature for slug and aquifer test comparisons. Hence, this technique is probably best suited for monitoring wells where conventional aquifer test methods are impractical. This approach is documented in several MATLAB m-files and illustrated by several examples using observed data. JF - Computers & Geosciences AU - McLin, Stepehn Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 264 EP - 271 PB - Elsevier, Amsterdam VL - 46 SN - 0098-3004, 0098-3004 KW - MATLAB KW - confined aquifers KW - data processing KW - optimization KW - mathematical models KW - ground water KW - aquifers KW - water table KW - fluctuations KW - transmissivity KW - mathematical methods KW - algorithms KW - storage KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080610659?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Geosciences&rft.atitle=Spectral+analysis+of+observed+aquifer+water+level+fluctuations&rft.au=McLin%2C+Stepehn&rft.aulast=McLin&rft.aufirst=Stepehn&rft.date=2012-09-01&rft.volume=46&rft.issue=&rft.spage=264&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Geosciences&rft.issn=00983004&rft_id=info:doi/10.1016%2Fj.cageo.2011.12.013 L2 - http://www.sciencedirect.com/science?_ob=JournalURL&_cdi=5840&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=e5198452fad934c6346f38b57511c8e0 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 46 N1 - Document feature - illus. incl. 2 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-09-27 N1 - CODEN - GGEOD5 N1 - SubjectsTermNotLitGenreText - algorithms; aquifers; confined aquifers; data processing; fluctuations; ground water; mathematical methods; mathematical models; MATLAB; optimization; storage; transmissivity; water table DO - http://dx.doi.org/10.1016/j.cageo.2011.12.013 ER - TY - JOUR T1 - A Scale-Aware Anticipated Potential Vorticity Method: On Variable-Resolution Meshes AN - 1069203583; 17155816 AB - A scale-aware formulation of the anticipated potential vorticity method (APVM), previously derived for quasi-uniform unstructured grids, is evaluated on multiresolution grids. Comparison is made to the original, nonscale-aware formulation of the APVM. Numerical experiments are performed using the shallow-water standard test case 5. The scale awareness of the new formulation is demonstrated by the following observations: (i) the range of optimal values for the single parameter of the new formulation is much less sensitive to grid resolution than that of the original formulation; (ii) within the optimal parameter range, the new formulation is able to maintain proper dissipation across scales and is thus able to produce better results in terms of errors in the potential enstrophy spectrum curves; and (iii) the new formulation is robust in that a single optimal parameter obtained for a specific grid can be safely used on other grids as well. JF - Monthly Weather Review AU - Chen, Qingshan AU - Gunzburger, Max AU - Ringler, Todd AD - Los Alamos National Laboratory, Los Alamos, New Mexico Y1 - 2012/09// PY - 2012 DA - Sep 2012 SP - 3127 EP - 3133 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 140 IS - 9 SN - 0027-0644, 0027-0644 KW - Meteorological & Geoastrophysical Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Oceanic Abstracts KW - Testing Procedures KW - Weather KW - Potential vorticity KW - Shallow water KW - Reviews KW - Numerical experiments KW - Standards KW - Enstrophy KW - Errors KW - SW 5010:Network design KW - Q2 09242:Observations and measurements at sea KW - M2 551.5:General (551.5) KW - O 2070:Meteorology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1069203583?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Monthly+Weather+Review&rft.atitle=A+Scale-Aware+Anticipated+Potential+Vorticity+Method%3A+On+Variable-Resolution+Meshes&rft.au=Chen%2C+Qingshan%3BGunzburger%2C+Max%3BRingler%2C+Todd&rft.aulast=Chen&rft.aufirst=Qingshan&rft.date=2012-09-01&rft.volume=140&rft.issue=9&rft.spage=3127&rft.isbn=&rft.btitle=&rft.title=Monthly+Weather+Review&rft.issn=00270644&rft_id=info:doi/10.1175%2FMWR-D-12-00081.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Number of references - 10 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Potential vorticity; Shallow water; Enstrophy; Numerical experiments; Testing Procedures; Weather; Reviews; Standards; Errors DO - http://dx.doi.org/10.1175/MWR-D-12-00081.1 ER - TY - JOUR T1 - Impacts of Elevation Data Spatial Resolution on Two-Dimensional Dam Break Flood Simulation and Consequence Assessment AN - 1855081552; PQ0003947903 AB - In the United States, there are approximately 84,000 dams including approximately 14,000 dams that area classified as high hazard. Approximately 50% of high hazard dams do not have an EAP, a document describing potential emergency conditions and potential areas at risk of flooding. A critical dataset required for identifying flood risk regions through modeling and simulation is digital elevation models (DEM). These data have become increasingly available at high resolution. The difficulty in utilizing the higher resolution data is that model computation time is increased drastically and becomes, in the case of wide-area (regional) analyses, infeasible to use. The tendency for modelers, therefore, is to use lower resolution data for these model applications. It is clear that when using the lower resolution data that topographic features are not represented as well, but it is not as clear what impact this has on two-dimensional modeling and flood risk estimation. Additionally, there is no rule-of-thumb as to which resolution should be used. This paper evaluates the impact grid resolution has on estimating the flood risk area resulting from dam failures using two-dimensional models. Results indicate that while flood extent, depths, and flood wave timing are sensitive to grid resolution, socioeconomic metrics such as population at risk and economic loss are less sensitive to simulation grid resolution. This observed socioeconomic insensitivity validates the potential of using coarse resolution simulation as a flood screening tool or in emergency response situations. JF - Journal of Water Resources Planning and Management AU - Judi, David R AU - Burian, Steven J AU - McPherson, Timothy N AD - Energy & Infrastructure Analysis, Los Alamos National Laboratory. MS C933, Los Alamos, NM, 87545, djudi[at]lanl.gov. Y1 - 2012/08/15/ PY - 2012 DA - 2012 Aug 15 PB - American Society of Civil Engineers, 1801 Alexander Bell Drive Reston VA 20191-4400 United States SN - 0733-9496, 0733-9496 KW - Meteorological & Geoastrophysical Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Environment Abstracts; Aqualine Abstracts KW - Risk assessment KW - Flood waves KW - Socioeconomics KW - Water resources KW - Hazards KW - Dams KW - Floods KW - Economics KW - Regional planning KW - Waves KW - Hydrologic Data KW - Water resources planning KW - Modelling KW - Screening KW - Simulation Analysis KW - Flood risk KW - Dam Failure KW - Simulation KW - USA KW - Dam control KW - Numerical simulations KW - Water management KW - Emergency preparedness KW - Elevation KW - Flooding KW - Emergencies KW - Water Resources KW - ENA 13:Population Planning & Control KW - AQ 00001:Water Resources and Supplies KW - Q2 09144:Regional studies, expeditions and data reports KW - SW 3060:Water treatment and distribution KW - M2 556.16:Runoff (556.16) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1855081552?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Water+Resources+Planning+and+Management&rft.atitle=Impacts+of+Elevation+Data+Spatial+Resolution+on+Two-Dimensional+Dam+Break+Flood+Simulation+and+Consequence+Assessment&rft.au=Judi%2C+David+R%3BBurian%2C+Steven+J%3BMcPherson%2C+Timothy+N&rft.aulast=Judi&rft.aufirst=David&rft.date=2012-08-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Water+Resources+Planning+and+Management&rft.issn=07339496&rft_id=info:doi/10.1061%2F%28ASCE%29WR.1943-5452.0000274 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2017-01-01 N1 - Last updated - 2017-02-15 N1 - SubjectsTermNotLitGenreText - Screening; Hazards; Floods; Water management; Dams; Flooding; Water resources; Emergencies; Modelling; Dam control; Numerical simulations; Flood waves; Flood risk; Water resources planning; Risk assessment; Emergency preparedness; Economics; Regional planning; Socioeconomics; Simulation; Waves; Simulation Analysis; Elevation; Dam Failure; Hydrologic Data; Water Resources; USA DO - http://dx.doi.org/10.1061/(ASCE)WR.1943-5452.0000274 ER - TY - JOUR T1 - The impact of vertical-axis rotations on shortening estimates AN - 1037239385; 2012-077187 AB - The total amount of deformation between two converging bodies is described by the three components of the displacement field: translation, rotation, and strain. Translations along faults and folding strain are the most common elements of the displacement field incorporated into estimates of tectonic shortening across orogenic systems. Determinations of vertical-axis rotations through paleomagnetic and structural analyses are keys for deciphering the rotational component of shortening within an orogenic system, and they can have a substantial effect on the amount of tectonic shortening in such systems. Accommodation structures observed in orogenic systems are typically noncoaxial and/or noncylindrical geometries (e.g., oblique and lateral ramps, superposed folding). These structures suggest that vertical-axis rotations have taken place, can aid in determining the relative timing of rotation with respect to translation, and may help constrain the location of the rotation axis. In this paper, we define the components of the total displacement field, describe the diagnostic and suggestive features associated with vertical-axis rotations, and apply trigonometric map-view calculations to estimate the amount of shortening contributed by such rotations. An error function relating shortening with vertical-axis rotation has been calculated and predicts values up to 50% for a 60 degrees rotation if the rotation is not taken into account. Finally, we apply our approach to the Wyoming salient and show that previous estimates of shortening there may contain up to 14% error. JF - Lithosphere AU - Sussman, Aviva J AU - Pueyo, Emilio L AU - Chase, Clement G AU - Mitra, Gautam AU - Weil, Arlo B Y1 - 2012/08/07/ PY - 2012 DA - 2012 Aug 07 SP - 383 EP - 394, 13 PB - Geological Society of America, Boulder, CO VL - 4 IS - 5 SN - 1941-8264, 1941-8264 KW - United States KW - strain KW - structural analysis KW - displacements KW - deformation KW - Wyoming Salient KW - geometry KW - Wyoming KW - crustal shortening KW - theoretical studies KW - rotation KW - applications KW - tectonics KW - faults KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037239385?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Lithosphere&rft.atitle=The+impact+of+vertical-axis+rotations+on+shortening+estimates&rft.au=Sussman%2C+Aviva+J%3BPueyo%2C+Emilio+L%3BChase%2C+Clement+G%3BMitra%2C+Gautam%3BWeil%2C+Arlo+B&rft.aulast=Sussman&rft.aufirst=Aviva&rft.date=2012-08-07&rft.volume=4&rft.issue=5&rft.spage=383&rft.isbn=&rft.btitle=&rft.title=Lithosphere&rft.issn=19418264&rft_id=info:doi/10.1130%2FL177.1 L2 - http://lithosphere.gsapubs.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 20 N1 - PubXState - CO N1 - Document feature - illus. N1 - Last updated - 2012-10-18 N1 - SubjectsTermNotLitGenreText - applications; crustal shortening; deformation; displacements; faults; geometry; rotation; strain; structural analysis; tectonics; theoretical studies; United States; Wyoming; Wyoming Salient DO - http://dx.doi.org/10.1130/L177.1 ER - TY - CPAPER T1 - Some outstanding questions regarding mechanisms of drought-related vegetation mortality T2 - 97th Annual Meeting of the Ecological Society of America (ESA 2012) AN - 1313080712; 6152611 JF - 97th Annual Meeting of the Ecological Society of America (ESA 2012) AU - McDowell, Nate Y1 - 2012/08/05/ PY - 2012 DA - 2012 Aug 05 KW - Vegetation KW - Mortality UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313080712?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=97th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2012%29&rft.atitle=Some+outstanding+questions+regarding+mechanisms+of+drought-related+vegetation+mortality&rft.au=McDowell%2C+Nate&rft.aulast=McDowell&rft.aufirst=Nate&rft.date=2012-08-05&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=97th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://eco.confex.com/eco/2012/webprogrampreliminary/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Vegetation change over western North America towards the end of 21st century T2 - 97th Annual Meeting of the Ecological Society of America (ESA 2012) AN - 1313061304; 6153393 JF - 97th Annual Meeting of the Ecological Society of America (ESA 2012) AU - Rauscher, Sara Y1 - 2012/08/05/ PY - 2012 DA - 2012 Aug 05 KW - North America KW - Vegetation changes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313061304?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=97th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2012%29&rft.atitle=Vegetation+change+over+western+North+America+towards+the+end+of+21st+century&rft.au=Rauscher%2C+Sara&rft.aulast=Rauscher&rft.aufirst=Sara&rft.date=2012-08-05&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=97th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://eco.confex.com/eco/2012/webprogrampreliminary/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Modeling M (sub s) -yield scaling of Nevada Test Site nuclear explosions for constraints on volumetric moment due to source-medium damage AN - 1270039232; 2013-009294 AB - The precision of M (sub s) -yield-scaling results is exploited to place tighter constraints on the volumetric moment due to source-medium damage than previously estimated for Pahute Mesa explosions on the Nevada Test Site (NTS). Results for two coupling scenarios, one based on P waves to set a lower bound and one based on Rayleigh waves to set an upper bound, bracket the predictions of a model based on moment tensor theory for an explosion monopole and the accompanying damage. This study confirms that the apparent explosion moment M (sub I) is a consequence of direct effects of the energy release with a volumetric moment M (sub t) due to cavity formation and the effects due to source-medium damage. The source model predicts that M (sub I) =M (sub t) (K+2)/3, where K is a damage index and a value of 1 means no permanent deformation due to damage. Excess moment due to dilation of the source medium (K>1) is quantified and shown to be a factor increasing the apparent yield (W) scaling of M (sub s) from 0.80log[W] for a pure explosion with cube-root containment practice and uniform coupling to approximately 1.0log[W], a scaling commonly accepted by the explosion community. Scaling observations are related to the source model by establishing the equivalence between network M (sub s) and the theoretical Rayleigh-wave radiation for an azimuthal-independent source component. This equivalence motivates a physical basis for transporting observations to other test sites. Transported M (sub s) scaling results for NTS indicate that damage is a more important source of Rayleigh waves for Balapan explosions, most likely due to better energy coupling of upgoing shock waves and stronger free-surface interactions than for NTS explosions. JF - Bulletin of the Seismological Society of America AU - Patton, Howard J Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 1373 EP - 1387 PB - Seismological Society of America, Berkeley, CA VL - 102 IS - 4 SN - 0037-1106, 0037-1106 KW - United States KW - P-waves KW - body waves KW - shock waves KW - guided waves KW - explosions KW - seismic moment KW - damage KW - elastic waves KW - seismic sources KW - Nye County Nevada KW - Rayleigh waves KW - models KW - Nevada Test Site KW - surface waves KW - seismicity KW - Pahute Mesa KW - seismic waves KW - nuclear explosions KW - Nevada KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270039232?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America&rft.atitle=Modeling+M+%28sub+s%29+-yield+scaling+of+Nevada+Test+Site+nuclear+explosions+for+constraints+on+volumetric+moment+due+to+source-medium+damage&rft.au=Patton%2C+Howard+J&rft.aulast=Patton&rft.aufirst=Howard&rft.date=2012-08-01&rft.volume=102&rft.issue=4&rft.spage=1373&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120110302 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Seismological Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 42 N1 - PubXState - CA N1 - Document feature - illus. incl. 4 tables N1 - Last updated - 2013-01-17 N1 - CODEN - BSSAAP N1 - SubjectsTermNotLitGenreText - body waves; damage; elastic waves; explosions; guided waves; models; Nevada; Nevada Test Site; nuclear explosions; Nye County Nevada; P-waves; Pahute Mesa; Rayleigh waves; seismic moment; seismic sources; seismic waves; seismicity; shock waves; surface waves; United States DO - http://dx.doi.org/10.1785/0120110302 ER - TY - JOUR T1 - Broadband Rayleigh-wave dispersion curve and shear-wave velocity structure for Yucca Flat, Nevada AN - 1270039220; 2013-009293 AB - The geology near a seismic source has a major effect on seismic waves recorded at distance. This can be especially true in the case of man-made explosions, due to increased geologic heterogeneity at shallow depths and interactions with the free surface. Yucca Flat (YF), a sedimentary basin on the Nevada National Security Site, has hosted hundreds of well-recorded underground nuclear tests. As such, it should be an ideal natural laboratory for the study of shallow explosions. Unfortunately, basin-wide models of such important physical properties as compressive- and shear-wave velocity are not available with sufficient fidelity to maximize the potential of the studies. We attempt to remedy this situation by creating a new shear-wave velocity model of YF. This model was generated by inverting Rayleigh-wave phase-velocity dispersion measurements. Because no single dataset provided a dispersion curve of the necessary frequency bandwidth for shallow, intermediate, and deep basin depths simultaneously, we combined three dispersion curves with complementary bandwidths from three data sources. The datasets, in order of low frequency to high, were (1) underground nuclear tests at YF, recorded on regional seismic networks (0.14-0.4 Hz); (2) a multimode spatially averaged coherency microtremor array located on YF (0.2-20 Hz); and (3) several refraction microtremor (ReMi) linear arrays, also on YF (2.5-50 Hz). Compared to previous work, our model is characterized by slower velocities. The known geologic boundaries such as the depth of the basin and water table are prominent at reasonable locations. JF - Bulletin of the Seismological Society of America AU - Schramm, Kimberly A AU - Abbott, Robert E AU - Asten, Michael AU - Bilek, Susan AU - Pancha, Aasha AU - Patton, Howard J Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 1361 EP - 1372 PB - Seismological Society of America, Berkeley, CA VL - 102 IS - 4 SN - 0037-1106, 0037-1106 KW - United States KW - elastic waves KW - frequency KW - seismic sources KW - surface waves KW - ground truth KW - seismicity KW - crosscorrelation KW - Yucca Flat KW - algorithms KW - nuclear explosions KW - Nevada KW - seismograms KW - body waves KW - guided waves KW - explosions KW - statistical analysis KW - Rayleigh waves KW - depth KW - boreholes KW - velocity structure KW - ground motion KW - seismic waves KW - wave dispersion KW - seismic networks KW - earthquakes KW - S-waves KW - arrays KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270039220?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America&rft.atitle=Broadband+Rayleigh-wave+dispersion+curve+and+shear-wave+velocity+structure+for+Yucca+Flat%2C+Nevada&rft.au=Schramm%2C+Kimberly+A%3BAbbott%2C+Robert+E%3BAsten%2C+Michael%3BBilek%2C+Susan%3BPancha%2C+Aasha%3BPatton%2C+Howard+J&rft.aulast=Schramm&rft.aufirst=Kimberly&rft.date=2012-08-01&rft.volume=102&rft.issue=4&rft.spage=1361&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120110296 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Seismological Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 25 N1 - PubXState - CA N1 - Document feature - illus. incl. 4 tables, sketch maps N1 - Last updated - 2013-01-17 N1 - CODEN - BSSAAP N1 - SubjectsTermNotLitGenreText - algorithms; arrays; body waves; boreholes; crosscorrelation; depth; earthquakes; elastic waves; explosions; frequency; ground motion; ground truth; guided waves; Nevada; nuclear explosions; Rayleigh waves; S-waves; seismic networks; seismic sources; seismic waves; seismicity; seismograms; statistical analysis; surface waves; United States; velocity structure; wave dispersion; Yucca Flat DO - http://dx.doi.org/10.1785/0120110296 ER - TY - JOUR T1 - CORRECTIONS FOR MEASUREMENTS OF TRITIUM IN SUBTERRANEAN VAPOR USING SILICA GEL AN - 1032895012; 16966799 AB - Hazardous contaminants buried within vadose zones can accumulate in soil gas. The concentrations and spatial extent of these contaminants are measured to evaluate potential transport to ground water for public risk evaluation. Tritium is an important contaminant found and monitored for in vadose zones across numerous sites within the United States nuclear weapons complex, including Los Alamos National Laboratory. The extraction, collection, and laboratory analysis of tritium from subterranean soil gas presents numerous technical challenges that have not been fully studied. Particularly, the lack of moisture in the soil gas in the vadose zone makes it difficult to obtain enough sample (e.g., >5 g) to provide for the required measurement sensitivity, and often, only small amounts of moisture can be collected. Further, although silica gel has high affinity for water vapor and is prebaked prior to sampling, there is still sufficient residual moisture in the prebaked gel to dilute the relatively small amount of sampled moisture; thereby, significantly lowering the "true" tritium concentration in the soil gas. This paper provides an evaluation of the magnitude of the bias from dilution, provides methods to correct past measurements by applying a correction factor (CF), and evaluates the uncertainty of the CF values. For this, ten-thousand Monte Carlo calculations were performed and distribution parameters of CF values were determined and evaluated. The mean and standard deviation of the distribution of CF values were 1.53 plus or minus 0.36, and the minimum, median, and maximum values were 1.14, 1.43, and 5.27, respectively. JF - Health Physics AU - Whicker, J AU - Dewart, J AU - Allen, S AU - Eisele, W AU - McNaughton, M AU - Green, A AD - Los Alamos National Laboratory, Los Alamos, NM 87545, USA Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - S56 EP - S57 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 103 IS - 2 SN - 0017-9078, 0017-9078 KW - Risk Abstracts; Pollution Abstracts KW - Soil KW - Monte Carlo simulation KW - Sensitivity KW - USA KW - Vapors KW - Weapons KW - Tritium KW - Water vapor KW - Nuclear weapons KW - USA, New Mexico, Los Alamos KW - Groundwater KW - P 2000:FRESHWATER POLLUTION KW - R2 23010:General: Models, forecasting UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1032895012?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=CORRECTIONS+FOR+MEASUREMENTS+OF+TRITIUM+IN+SUBTERRANEAN+VAPOR+USING+SILICA+GEL&rft.au=Whicker%2C+J%3BDewart%2C+J%3BAllen%2C+S%3BEisele%2C+W%3BMcNaughton%2C+M%3BGreen%2C+A&rft.aulast=Whicker&rft.aufirst=J&rft.date=2012-08-01&rft.volume=103&rft.issue=2&rft.spage=S56&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-08-01 N1 - Last updated - 2013-08-12 N1 - SubjectsTermNotLitGenreText - Monte Carlo simulation; Soil; Sensitivity; Weapons; Vapors; Water vapor; Tritium; Nuclear weapons; Groundwater; USA; USA, New Mexico, Los Alamos ER - TY - JOUR T1 - IMPROVING RADIOLOGICAL SAFETY IN A NUCLEAR FACILITY USING STATISTICAL PROCESS CONTROL (SPC) AN - 1032892159; 16966940 AB - Los Alamos National Laboratory (LANL) has utilized Statistical Process Control (SPC) to monitor and improve radiation protection (RP) performance. SPC has been increasingly applied over time and has shown tremendous value by providing critical information to LANL managers. These techniques are simple to implement yet provide remarkable utility. The LANL RP organization developed and implemented SPC methods to analyze RP-related data, monitor performance, identify areas for improvement, and measure efficacy of improvement actions. Characteristics of leading (input) and lagging (output) indicators were defined as were the patterns of data indicating a significant change or trend. Use of control charts, objective identification of trends, and performance ratings are all easily created. SPC processes have been applied progressively to plutonium facility operations, to solve problems of particular RP relevance. A set of facility-specific critical worker behaviors and outcomes necessary for minimizing the likelihood of radiological contamination and airborne radioactivity were identified. Leading and lagging RP indicators were tracked over time. Identification of trends using SPC-based control charts and stop light charts identified areas where improvement actions were needed. Demonstrable improvement in performance in several categories related to contamination control and potential for airborne intakes were evident. This presentation provides a brief overview and history of use of SPC at LANL, discusses the methods and specific applications, and provides examples of improved safety. Lessons learned during the development and implementation of SPC are presented and discussed. JF - Health Physics AU - Costigan, S AD - Los Alamos National Laboratory, Los Alamos, NM 8754, USA Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - S112 EP - S113 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 103 IS - 2 SN - 0017-9078, 0017-9078 KW - Health & Safety Science Abstracts; Pollution Abstracts KW - Historical account KW - Plutonium KW - USA, New Mexico, Los Alamos KW - Radioactivity KW - Pollution control KW - H 8000:Radiation Safety/Electrical Safety KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1032892159?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=IMPROVING+RADIOLOGICAL+SAFETY+IN+A+NUCLEAR+FACILITY+USING+STATISTICAL+PROCESS+CONTROL+%28SPC%29&rft.au=Costigan%2C+S&rft.aulast=Costigan&rft.aufirst=S&rft.date=2012-08-01&rft.volume=103&rft.issue=2&rft.spage=S112&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-08-01 N1 - Last updated - 2013-08-12 N1 - SubjectsTermNotLitGenreText - Historical account; Plutonium; Radioactivity; Pollution control; USA, New Mexico, Los Alamos ER - TY - JOUR T1 - Operational Experience of Continuous Air Monitoring of Smoke for super(239)Pu during a Wildfire AN - 1032891871; 16966952 AB - Smoke from a wildfire in northern New Mexico that moved along the border of the Los Alamos National Laboratory (LANL) was monitored for super(239)Pu in the event that the fire might cross into LANL property containing locations with low, but greater than background, levels of super(239)Pu and other alpha-emitting radionuclides. Three Environmental Continuous Air Monitors (ECAMs) in operation at LANL at the time of the fire provided near realtime measurements of the super(239)Pu in the smoke. Sampling data from routine measurements of PM-10 and PM-2.5 concentrations in the city of Los Alamos showed that smoke in the air rose during the fire to several hundred mu g m super(-3), which produced limited visibility (several hundred meters) and resulted in poor air quality alerts for about a week-long period. Previous studies have shown that airborne dust can significantly impair continuous air monitors, so the purpose of this study was to assess the performance of the ECAMs under smoky conditions, which is important for many emergency response scenarios. Additionally, ECAMs are not required to be tested in smoke by ANSI standards, so there is little to no published data on performance of any ECAM while sampling smoke. Results show that the deployed ECAMs had reduced flow as the filter clogged with fine particles, but the goodness-of-fit parameter of the peak shape fitting algorithms and the minimum detectable concentration and dose were not impacted until the flow was reduced by more than about 20%, and even then they were within tolerable limits. Overall, ECAM performance was not impacted during the fire even under heavy smoke conditions and fluctuating radon levels, though changing the filters to limit any reductions in flow to less than 20% would maintain optimal ECAM performance. JF - Health Physics AU - Whicker, J J AU - Baltz, D AU - Eisele, W F AU - Hart, O F AU - McNaughton, M W AU - Green, A A AD - Los Alamos National Laboratory, Mail Stop M996, Los Alamos, NM 87545, USA, jiwhicker@lanl.gov Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - S161 EP - S168 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 103 IS - 2 SN - 0017-9078, 0017-9078 KW - Pollution Abstracts KW - Smoke KW - Filters KW - Fires KW - Pollution monitoring KW - USA, New Mexico KW - Wildfire KW - Emergency preparedness KW - Radiation measurements KW - Air quality KW - USA, New Mexico, Los Alamos KW - Particulates KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1032891871?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=Operational+Experience+of+Continuous+Air+Monitoring+of+Smoke+for+super%28239%29Pu+during+a+Wildfire&rft.au=Whicker%2C+J+J%3BBaltz%2C+D%3BEisele%2C+W+F%3BHart%2C+O+F%3BMcNaughton%2C+M+W%3BGreen%2C+A+A&rft.aulast=Whicker&rft.aufirst=J&rft.date=2012-08-01&rft.volume=103&rft.issue=2&rft.spage=S161&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-08-01 N1 - Last updated - 2013-08-12 N1 - SubjectsTermNotLitGenreText - Filters; Smoke; Pollution monitoring; Fires; Wildfire; Emergency preparedness; Radiation measurements; Air quality; Particulates; USA, New Mexico; USA, New Mexico, Los Alamos ER - TY - JOUR T1 - Increased temperature and altered summer precipitation have differential effects on biological soil crusts in a dryland ecosystem AN - 1028033240; 16917093 AB - Biological soil crusts (biocrusts) are common and ecologically important members of dryland ecosystems worldwide, where they stabilize soil surfaces and contribute newly fixed C and N to soils. To test the impacts of predicted climate change scenarios on biocrusts in a dryland ecosystem, the effects of a 2-3 degree C increase in soil temperature and an increased frequency of smaller summer precipitation events were examined in a large, replicated field study conducted in the cold desert of the Colorado Plateau, USA. Surface soil biomass (DNA concentration), photosynthetically active cyanobacterial biomass (chlorophyll a concentration), cyanobacterial abundance (quantitative PCR assay), and bacterial community composition (16S rRNA gene sequencing) were monitored seasonally over 2 years. Soil microbial biomass and bacterial community composition were highly stratified between the 0-2 cm depth biocrusts and 5-10 cm depth soil beneath the biocrusts. The increase in temperature did not have a detectable effect on any of the measured parameters over 2 years. However, after the second summer of altered summer precipitation pattern, significant declines occurred in the surface soil biomass (avg. DNA concentration declined 38%), photosynthetic cyanobacterial biomass (avg. chlorophyll a concentration declined 78%), cyanobacterial abundance (avg. gene copies g-1 soil declined 95%), and proportion of Cyanobacteria in the biocrust bacterial community (avg. representation in sequence libraries declined 85%). Biocrusts are important contributors to soil stability, soil C and N stores, and plant performance, and the loss or reduction of biocrusts under an altered precipitation pattern associated with climate change could contribute significantly to lower soil fertility and increased erosion and dust production in dryland ecosystems at a regional scale. JF - Global Change Biology AU - Johnson, Shannon L AU - Kuske, Cheryl R AU - Carney, Travis D AU - Housman, David C AU - Gallegos-Graves, La Verne AU - Belnap, Jayne AD - Los Alamos National Laboratory Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 2583 EP - 2593 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 18 IS - 8 SN - 1354-1013, 1354-1013 KW - Environment Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality; Sustainability Science Abstracts; Ecology Abstracts KW - Chlorophylls KW - Chlorophyll KW - Rainfall KW - Nucleotide sequence KW - Abundance KW - Climatic changes KW - Climate change KW - Soil temperature KW - Phytoplankton KW - Summer KW - Dust KW - Soil KW - DNA sequencing KW - Soil fertility KW - Soils KW - Polymerase chain reaction KW - Abiotic factors KW - Temperature effects KW - Temperature KW - USA, Colorado Plateau KW - Precipitation KW - Biomass KW - Community composition KW - Cyanobacteria KW - Deserts KW - DNA KW - rRNA 16S KW - M3 1010:Issues in Sustainable Development KW - D 04040:Ecosystem and Ecology Studies KW - Q5 08502:Methods and instruments KW - ENA 15:Renewable Resources-Terrestrial UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1028033240?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aasfaaquaticpollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Global+Change+Biology&rft.atitle=Increased+temperature+and+altered+summer+precipitation+have+differential+effects+on+biological+soil+crusts+in+a+dryland+ecosystem&rft.au=Johnson%2C+Shannon+L%3BKuske%2C+Cheryl+R%3BCarney%2C+Travis+D%3BHousman%2C+David+C%3BGallegos-Graves%2C+La+Verne%3BBelnap%2C+Jayne&rft.aulast=Johnson&rft.aufirst=Shannon&rft.date=2012-08-01&rft.volume=18&rft.issue=8&rft.spage=2583&rft.isbn=&rft.btitle=&rft.title=Global+Change+Biology&rft.issn=13541013&rft_id=info:doi/10.1111%2Fj.1365-2486.2012.02709.x LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-07-01 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Temperature effects; Chlorophylls; Community composition; Nucleotide sequence; Climate change; Soils; DNA; Phytoplankton; Abiotic factors; Chlorophyll; Climatic changes; Abundance; Soil temperature; Precipitation; Biomass; Dust; DNA sequencing; Soil fertility; Deserts; Polymerase chain reaction; rRNA 16S; Soil; Rainfall; Temperature; Summer; Cyanobacteria; USA, Colorado Plateau DO - http://dx.doi.org/10.1111/j.1365-2486.2012.02709.x ER - TY - JOUR T1 - Unstable Richtmyer-Meshkov growth of solid and liquid metals in vacuum AN - 1038305361; 16888197 AB - We present experimental results supporting physics-based ejecta model development, where our main assumption is that ejecta form as a special limiting case of a Richtmyer-Meshkov (RM) instability at a metal-vacuum interface. From this assumption, we test established theory of unstable spike and bubble growth rates, rates that link to the wavelength and amplitudes of surface perturbations. We evaluate the rate theory through novel application of modern laser Doppler velocimetry (LDV) techniques, where we coincidentally measure bubble and spike velocities from explosively shocked solid and liquid metals with a single LDV probe. We also explore the relationship of ejecta formation from a solid material to the plastic flow stress it experiences at high-strain rates (10 super(7) s super(-1)) and high strains (700 %) as the fundamental link to the onset of ejecta formation. Our experimental observations allow us to approximate the strength of Cu at high strains and strain rates, revealing a unique diagnostic method for use at these extreme conditions. JF - Journal of Fluid Mechanics AU - Buttler, W T AU - Oro, D M AU - Preston, D L AU - Mikaelian, KO AU - Cherne, F J AU - Hixson, R S AU - Mariam, F G AU - Morris, C AU - Stone, J B AU - Terrones, G AU - Tupa, D AD - Los Alamos National Laboratory, Physics, Los Alamos, NM 87544, USA, buttler@lanl.gov Y1 - 2012/07/25/ PY - 2012 DA - 2012 Jul 25 SP - 60 EP - 84 PB - Cambridge University Press, The Edinburgh Building, Cambridge CB2 2RU United Kingdom VL - 703 SN - 0022-1120, 0022-1120 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Growth rate KW - Metals KW - Heavy metals KW - Velocity KW - Solids KW - Growth Rates KW - Strain KW - Fluid Mechanics KW - Wave amplitude KW - Wavelengths KW - Fluid mechanics KW - Plastic flow KW - Lasers KW - Bubbles KW - Q2 09169:Fluid mechanics KW - SW 6070:Materials UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1038305361?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Fluid+Mechanics&rft.atitle=Unstable+Richtmyer-Meshkov+growth+of+solid+and+liquid+metals+in+vacuum&rft.au=Buttler%2C+W+T%3BOro%2C+D+M%3BPreston%2C+D+L%3BMikaelian%2C+KO%3BCherne%2C+F+J%3BHixson%2C+R+S%3BMariam%2C+F+G%3BMorris%2C+C%3BStone%2C+J+B%3BTerrones%2C+G%3BTupa%2C+D&rft.aulast=Buttler&rft.aufirst=W&rft.date=2012-07-25&rft.volume=703&rft.issue=&rft.spage=60&rft.isbn=&rft.btitle=&rft.title=Journal+of+Fluid+Mechanics&rft.issn=00221120&rft_id=info:doi/10.1017%2Fjfm.2012.190 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-09-01 N1 - Last updated - 2016-10-26 N1 - SubjectsTermNotLitGenreText - Growth rate; Fluid mechanics; Heavy metals; Plastic flow; Wave amplitude; Metals; Velocity; Lasers; Solids; Growth Rates; Strain; Fluid Mechanics; Bubbles; Wavelengths DO - http://dx.doi.org/10.1017/jfm.2012.190 ER - TY - JOUR T1 - A DNA-templated fluorescent silver nanocluster with enhanced stability. AN - 1023293489; 22648534 AB - We report the discovery of a DNA sequence that templates a highly stable fluorescent silver nanocluster. In contrast to other DNA templated silver nanoclusters that have a relatively short shelf-life, the fluorescent species templated in this new DNA sequence retains significant fluorescence for at least a year. Moreover, this new silver nanocluster possesses low cellular toxicity and enhanced thermal, oxidative, and chemical stability. JF - Nanoscale AU - Sharma, Jaswinder AU - Rocha, Reginaldo C AU - Phipps, M Lisa AU - Yeh, Hsin-Chih AU - Balatsky, Kirill A AU - Vu, Dung M AU - Shreve, Andrew P AU - Werner, James H AU - Martinez, Jennifer S AD - MPA-Center for Integrated Nanotechnologies, Los Alamos National Laboratory, MS K771, Los Alamos, NM 87545, USA. Y1 - 2012/07/21/ PY - 2012 DA - 2012 Jul 21 SP - 4107 EP - 4110 VL - 4 IS - 14 KW - Silver KW - 3M4G523W1G KW - DNA KW - 9007-49-2 KW - Index Medicus KW - Oxidation-Reduction KW - Circular Dichroism KW - Time Factors KW - Silver -- chemistry KW - Metal Nanoparticles -- chemistry KW - DNA -- chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1023293489?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nanoscale&rft.atitle=A+DNA-templated+fluorescent+silver+nanocluster+with+enhanced+stability.&rft.au=Sharma%2C+Jaswinder%3BRocha%2C+Reginaldo+C%3BPhipps%2C+M+Lisa%3BYeh%2C+Hsin-Chih%3BBalatsky%2C+Kirill+A%3BVu%2C+Dung+M%3BShreve%2C+Andrew+P%3BWerner%2C+James+H%3BMartinez%2C+Jennifer+S&rft.aulast=Sharma&rft.aufirst=Jaswinder&rft.date=2012-07-21&rft.volume=4&rft.issue=14&rft.spage=4107&rft.isbn=&rft.btitle=&rft.title=Nanoscale&rft.issn=2040-3372&rft_id=info:doi/10.1039%2Fc2nr30662j LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2012-10-22 N1 - Date created - 2012-07-03 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1039/c2nr30662j ER - TY - JOUR T1 - Radial flow to a partially penetrating well with storage in an anisotropic confined aquifer AN - 1037239285; 2012-078645 AB - Drawdowns generated by extracting water from large diameter (e.g. water supply) well are affected by wellbore storage. We present an analytical solution in Laplace transformed space for drawdown in a uniform anisotropic aquifer caused by withdrawing water at a constant rate from partially penetrating well with storage. The solution is back transformed into the time domain numerically. When the pumping well is fully penetrating our solution reduces to that of Papadopulos and Cooper (1967); Hantush (1964) when the pumping well has no wellbore storage; Theis (1935) when both conditions are fulfilled and Yang (2006) when the pumping well is partially penetrating, has finite radius but lacks storage. Newly developed solution is then used to explore graphically the effects of partial penetration, wellbore storage and anisotropy on time evolutions of drawdown in the pumping well and in observation wells. We concluded after validating the developed analytical solution using synthetic pumping test. JF - Journal of Hydrology AU - Mishra, P K AU - Vesselinov, V V AU - Neuman, S P Y1 - 2012/07/02/ PY - 2012 DA - 2012 Jul 02 SP - 255 EP - 259 PB - Elsevier, Amsterdam VL - 448-449 SN - 0022-1694, 0022-1694 KW - water storage KW - water supply KW - confined aquifers KW - exploitation KW - Laplace transformations KW - ground water KW - aquifers KW - water table KW - pump tests KW - drawdown KW - mathematical methods KW - time domain analysis KW - water wells KW - water resources KW - anisotropy KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037239285?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Hydrology&rft.atitle=Radial+flow+to+a+partially+penetrating+well+with+storage+in+an+anisotropic+confined+aquifer&rft.au=Mishra%2C+P+K%3BVesselinov%2C+V+V%3BNeuman%2C+S+P&rft.aulast=Mishra&rft.aufirst=P&rft.date=2012-07-02&rft.volume=448-449&rft.issue=&rft.spage=255&rft.isbn=&rft.btitle=&rft.title=Journal+of+Hydrology&rft.issn=00221694&rft_id=info:doi/10.1016%2Fj.jhydrol.2012.05.010 L2 - http://www.sciencedirect.com/science/journal/00221694 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 14 N1 - Document feature - illus. N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-08-31 N1 - CODEN - JHYDA7 N1 - SubjectsTermNotLitGenreText - anisotropy; aquifers; confined aquifers; drawdown; exploitation; ground water; Laplace transformations; mathematical methods; pump tests; time domain analysis; water resources; water storage; water supply; water table; water wells DO - http://dx.doi.org/10.1016/j.jhydrol.2012.05.010 ER - TY - JOUR T1 - Evidence for unfractured magnesium isotopes in Genesis SoS wafers AN - 1849297664; 2016-104436 JF - Meteoritics & Planetary Science AU - Humayun, Munir AU - Jurewicz, A J G AU - Olinger, C AU - Burnett, D S AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5353 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - isotope fractionation KW - alkaline earth metals KW - magnesium KW - Genesis Mission KW - oxygen KW - ion probe data KW - isotopes KW - isotope ratios KW - solar wind KW - mass spectra KW - silicon-on-sapphire KW - silicon KW - stable isotopes KW - Mg-25/Mg-24 KW - metals KW - Sun KW - sapphire KW - oxides KW - spectra KW - SoS KW - 04:Extraterrestrial geology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297664?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Evidence+for+unfractured+magnesium+isotopes+in+Genesis+SoS+wafers&rft.au=Humayun%2C+Munir%3BJurewicz%2C+A+J+G%3BOlinger%2C+C%3BBurnett%2C+D+S%3BAnonymous&rft.aulast=Humayun&rft.aufirst=Munir&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5353.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 6 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 18, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; Genesis Mission; ion probe data; isotope fractionation; isotope ratios; isotopes; magnesium; mass spectra; metals; Mg-25/Mg-24; oxides; oxygen; sapphire; silicon; silicon-on-sapphire; solar wind; SoS; spectra; stable isotopes; Sun ER - TY - JOUR T1 - Development of Self-Interrogation Neutron Resonance Densitometry to Quantify the Fissile Content in PWR Spent LEU and MOX Assemblies AN - 1671350205; 17209783 AB - A new nondestructive assay technique called self-interrogation neutron resonance densitometry (SINRD) is currently being developed at Los Alamos National Laboratory to improve existing nuclear safeguards and material accountability measurements for light water reactor fuel assemblies. The viability of using SINRD to quantify the fissile content ((235)U and (239)Pu) in pressurized water reactor 17 x 17 spent low-enriched uranium and mixed-oxide fuel assemblies in water was investigated via Monte Carlo N-particle extended transport code simulations. SINRD utilizes (244)Cm spontaneous fission neutrons to self-interrogate the fuel pins. The amount of resonance absorption of these neutrons in the fuel can be quantified using (235)U and (239)Pu fission chambers placed adjacent to the assembly. The sensitivity of this technique is based on using the same fissile materials in the fission chambers as are present in the fuel because the effect of resonance absorption lines in the transmitted flux is amplified by the corresponding (n,f) reaction peaks in the fission chamber. SINRD requires calibration with a reference assembly of similar geometry. However, this densitometry method uses ratios of different fission chambers so that most systematic errors related to calibration and positioning cancel in the ratios. JF - Nuclear Science and Engineering AU - Lafleur, Adrienne M AU - Charlton, William S AU - Menlove, Howard O AU - Swinhoe, Martyn T AD - Nuclear Nonproliferation Division, Los Alamos National Laboratory P O Box 1663, MS E540, Los Alamos, New Mexico 87545 alafleur@lanl.gov Y1 - 2012/07// PY - 2012 DA - Jul 2012 SP - 175 EP - 191 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 171 IS - 3 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Computer simulation KW - Monte Carlo methods KW - Fuels KW - Chambers KW - Assemblies KW - Resonance absorption KW - Fission KW - Densitometry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671350205?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Development+of+Self-Interrogation+Neutron+Resonance+Densitometry+to+Quantify+the+Fissile+Content+in+PWR+Spent+LEU+and+MOX+Assemblies&rft.au=Lafleur%2C+Adrienne+M%3BCharlton%2C+William+S%3BMenlove%2C+Howard+O%3BSwinhoe%2C+Martyn+T&rft.aulast=Lafleur&rft.aufirst=Adrienne&rft.date=2012-07-01&rft.volume=171&rft.issue=3&rft.spage=175&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-11-01 N1 - Number of references - 16 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - Improving genome assemblies by sequencing PCR products with PacBio AN - 1654689167; PQ0001037796 AB - Advances in sequencing technologies have dramatically reduced costs in producing high-quality draft genomes. However, there are still many contigs and possible misassembled regions in those draft genomes. Improving the quality of these genomes requires an efficient and economical means to close gaps and resequence some regions. Sequencing pooled gap region PCR products with Pacific Biosciences (PacBio) provides a significantly less expensive means for this need. We have developed a genome improvement pipeline with this strategy after decreasing a loading bias against larger PCR products in the PacBio process. Compared with Sanger technology, this approach is not only cost-effective but also can close gaps greater than 2.5 kb in a single round of reactions, and sequence through high GC regions as well as difficult secondary structures such as small hairpin loops. JF - BioTechniques AU - Zhang, Xiaojing AU - Davenport, Karen W AU - Gu, Wei AU - Daligault, Hajnalka E AU - Munk, A Christine AU - Tashima, Hazuki AU - Reitenga, Krista AU - Green, Lance D AU - Han, Cliff S AD - The Genome Science Group, Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM, U.S.A Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 61 EP - 62 PB - Eaton Publishing Co., One Research Drive, Suite 400A Westboro MA 01581 United States VL - 53 IS - 1 SN - 0736-6205, 0736-6205 KW - Biotechnology and Bioengineering Abstracts KW - Genomes KW - Protein structure KW - Guanylate cyclase KW - Secondary structure KW - Polymerase chain reaction KW - W 30910:Imaging UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1654689167?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=BioTechniques&rft.atitle=Improving+genome+assemblies+by+sequencing+PCR+products+with+PacBio&rft.au=Zhang%2C+Xiaojing%3BDavenport%2C+Karen+W%3BGu%2C+Wei%3BDaligault%2C+Hajnalka+E%3BMunk%2C+A+Christine%3BTashima%2C+Hazuki%3BReitenga%2C+Krista%3BGreen%2C+Lance+D%3BHan%2C+Cliff+S&rft.aulast=Zhang&rft.aufirst=Xiaojing&rft.date=2012-07-01&rft.volume=53&rft.issue=1&rft.spage=61&rft.isbn=&rft.btitle=&rft.title=BioTechniques&rft.issn=07366205&rft_id=info:doi/10.2144%2F0000113891 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-02-01 N1 - Last updated - 2016-04-29 N1 - SubjectsTermNotLitGenreText - Protein structure; Genomes; Guanylate cyclase; Secondary structure; Polymerase chain reaction DO - http://dx.doi.org/10.2144/0000113891 ER - TY - JOUR T1 - Wash or dissolve? AN - 1038611696; 17062573 AB - Reuseable, launderable protective clothing has been the standard in the nuclear industry for several decades. Over the years, radioactive waste disposal costs have increased and disposal options have become more limited, which has prompted the development of single-use, dissolvable protective clothing. A Los Alamos National Laboratory (LANL) pilot study has evaluated single-use dissolvable protective clothing as a replacement for conventional woven textile garments. JF - Nuclear Engineering International AU - Cournoyer, M AU - Wannigman, D AU - Dodge, R AD - Los Alamos National Laboratory, Los Alamos, New Mexico, USA, mec@lanl.gov Y1 - 2012/07// PY - 2012 DA - Jul 2012 SP - 24 EP - 27 PB - Wilmington Publishing, Wilmington House Maidstone Rd., Foots Cray Sidcup Kent DA14 5HZ United Kingdom VL - 57 IS - 696 SN - 0029-5507, 0029-5507 KW - Pollution Abstracts; Environment Abstracts KW - Radioactive waste disposal KW - Protective clothing KW - USA, New Mexico, Los Alamos KW - ENA 14:Radiological Contamination KW - P 4000:WASTE MANAGEMENT UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1038611696?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Engineering+International&rft.atitle=Wash+or+dissolve%3F&rft.au=Cournoyer%2C+M%3BWannigman%2C+D%3BDodge%2C+R&rft.aulast=Cournoyer&rft.aufirst=M&rft.date=2012-07-01&rft.volume=57&rft.issue=696&rft.spage=24&rft.isbn=&rft.btitle=&rft.title=Nuclear+Engineering+International&rft.issn=00295507&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Radioactive waste disposal; Protective clothing; USA, New Mexico, Los Alamos ER - TY - JOUR T1 - Fumarolic pipes in the Tshirege Member of the Bandelier Tuff on the Pajarito Plateau, Jemez Mountains, New Mexico AN - 1030491518; 2012-069538 AB - The objective of this study is to demonstrate the relationships among devitrification, vapor phase alteration, localization of gas emanations into fumarolic pipes, and initial deformation of the ash flow sheet during cooling and lithification. Utilizing a unique and temporary exposure of the Tshirege Member of the Bandelier Tuff near Los Alamos, New Mexico, we identify several zones of distinctly preserved fossil fumarolic activity. The fumarolic zones vary in width from a few centimeters to more than a meter. Almost ubiquitously, these zones demonstrate fines-depletion, induration of the margins, upward-flaring geometries, and intense fracturing of overlying geologic units. The fumaroles were preferentially located on post welding, early formed cooling joints that vented to the surface after the vapor phase alteration stage. The pipes were regularly spaced at distances of approximately 4.5 m (N-S) to 7 m (E-W). In turn the pipes were covered by a surge deposit and overlying tuff which rapidly lithified. The overlying tuff was then brecciated during continued fumarolic pipe emissions. Geochemical evaluations confirm the presence of high-temperature mineral (scapolite) indicative of transport of hot volcanic gases through these zones. The pipe centers and walls are depleted in SiO (sub 2) , and enriched in Al (sub 2) O (sub 3) and FeO. The overlying tuff breccia zones are enriched in Al (sub 2) O (sub 3) , FeO and MgO, and depleted in SiO (sub 2) , NaO, and K (sub 2) O. From comparison to other ignimbrite cooling histories, the fissures, fumaroles, and structures observed all likely formed in the first few decades after the deposition of the upper Tshirege subunits. This may have significant implications as to timing of initial cooling fractures and subsequent consolidation of gas emission pathways. Copyright 2012 Springer-Verlag JF - Bulletin of Volcanology AU - Caporuscio, Florie A AU - Gardner, Jamie N AU - Schultz-Fellenz, Emily S AU - Kelley, Richard E Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1023 EP - 1037 PB - Springer International [for the] International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI), Heidelberg VL - 74 IS - 5 SN - 0258-8900, 0258-8900 KW - United States KW - silicates KW - volcanic rocks KW - igneous rocks KW - fumaroles KW - Pajarito Plateau KW - New Mexico KW - Los Alamos County New Mexico KW - Cenozoic KW - Tshirege Member KW - Bandelier Tuff KW - volcanism KW - scapolite KW - Jemez Mountains KW - framework silicates KW - tuff KW - chemical composition KW - scapolite group KW - Quaternary KW - ignimbrite KW - pipes KW - gases KW - pyroclastics KW - intrusions KW - Pleistocene KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1030491518?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+Volcanology&rft.atitle=Fumarolic+pipes+in+the+Tshirege+Member+of+the+Bandelier+Tuff+on+the+Pajarito+Plateau%2C+Jemez+Mountains%2C+New+Mexico&rft.au=Caporuscio%2C+Florie+A%3BGardner%2C+Jamie+N%3BSchultz-Fellenz%2C+Emily+S%3BKelley%2C+Richard+E&rft.aulast=Caporuscio&rft.aufirst=Florie&rft.date=2012-07-01&rft.volume=74&rft.issue=5&rft.spage=1023&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+Volcanology&rft.issn=02588900&rft_id=info:doi/10.1007%2Fs00445-012-0582-4 L2 - http://www.springerlink.com/(1k1tfmmpjinass550lg0zy55)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:100402,1 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 35 N1 - Document feature - illus. incl. sketch map N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-08-02 N1 - CODEN - BUVOEW N1 - SubjectsTermNotLitGenreText - Bandelier Tuff; Cenozoic; chemical composition; framework silicates; fumaroles; gases; igneous rocks; ignimbrite; intrusions; Jemez Mountains; Los Alamos County New Mexico; New Mexico; Pajarito Plateau; pipes; Pleistocene; pyroclastics; Quaternary; scapolite; scapolite group; silicates; Tshirege Member; tuff; United States; volcanic rocks; volcanism DO - http://dx.doi.org/10.1007/s00445-012-0582-4 ER - TY - JOUR T1 - Kinetic and structural characterization of thermostabilized mutants of human carbonic anhydrase II AN - 1024664577; 16864651 AB - Carbonic anhydrases (CAs) are ubiquitous enzymes that catalyze the reversible hydration/dehydration of carbon dioxide/bicarbonate. As such, there is enormous industrial interest in using CA as a bio-catalyst for carbon sequestration and biofuel production. However, to ensure cost-effective use of the enzyme under harsh industrial conditions, studies were initiated to produce variants with enhanced thermostability while retaining high solubility and catalytic activity. Kinetic and structural studies were conducted to determine the structural and functional effects of these mutations. X-ray crystallography revealed that a gain in surface hydrogen bonding contributes to stability while retaining proper active site geometry and electrostatics to sustain catalytic efficiency. The kinetic profiles determined under a variety of conditions show that the surface mutations did not negatively impact the carbon dioxide hydration or proton transfer activity of the enzyme. Together these results show that it is possible to enhance the thermal stability of human carbonic anhydrase II by specific replacements of surface hydrophobic residues of the enzyme. In addition, combining these stabilizing mutations with strategic active site changes have resulted in thermostable mutants with desirable kinetic properties. JF - Protein Engineering Design and Selection AU - Fisher, Zoee AU - Boone, Christopher D AU - Biswas, Shya Masri AU - Venkatakrishnan, Balasubramanian AU - Aggarwal, Mayank AU - Tu, Chingkuang AU - Agbandje-McKenna, Mavis AU - Silverman, David AU - McKenna, Robert AD - 1 Bioscience Division, TA-53 Bldg 622, Mailstop H805, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, zfisher@lanl.gov Y1 - 2012/07// PY - 2012 DA - Jul 2012 SP - 347 EP - 355 PB - Oxford University Press, Great Clarendon Street Oxford OX2 6DP United Kingdom VL - 25 IS - 7 SN - 1741-0126, 1741-0126 KW - Biotechnology and Bioengineering Abstracts KW - Bicarbonate KW - Biofuels KW - Carbon KW - Carbon dioxide KW - Carbonate dehydratase KW - Carbonic anhydrase II KW - Dehydration KW - Electrostatic properties KW - Enzymes KW - Hydration KW - Hydrogen bonding KW - Hydrophobicity KW - Kinetics KW - Mutation KW - Protons KW - Solubility KW - Structure-function relationships KW - Thermal stability KW - X-ray crystallography KW - W 30925:Genetic Engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1024664577?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Protein+Engineering+Design+and+Selection&rft.atitle=Kinetic+and+structural+characterization+of+thermostabilized+mutants+of+human+carbonic+anhydrase+II&rft.au=Fisher%2C+Zoee%3BBoone%2C+Christopher+D%3BBiswas%2C+Shya+Masri%3BVenkatakrishnan%2C+Balasubramanian%3BAggarwal%2C+Mayank%3BTu%2C+Chingkuang%3BAgbandje-McKenna%2C+Mavis%3BSilverman%2C+David%3BMcKenna%2C+Robert&rft.aulast=Fisher&rft.aufirst=Zoee&rft.date=2012-07-01&rft.volume=25&rft.issue=7&rft.spage=347&rft.isbn=&rft.btitle=&rft.title=Protein+Engineering+Design+and+Selection&rft.issn=17410126&rft_id=info:doi/10.1093%2Fprotein%2Fgzs027 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-07-01 N1 - Last updated - 2012-07-27 N1 - SubjectsTermNotLitGenreText - Hydration; Solubility; Protons; Enzymes; Electrostatic properties; Bicarbonate; Hydrophobicity; Carbonate dehydratase; X-ray crystallography; Carbon; Hydrogen bonding; Structure-function relationships; Kinetics; Carbonic anhydrase II; Thermal stability; Carbon dioxide; Mutation; Biofuels; Dehydration DO - http://dx.doi.org/10.1093/protein/gzs027 ER - TY - JOUR T1 - DNA binding site analysis of Burkholderia thailandensis response regulators AN - 1020853199; 16790971 AB - Bacterial response regulators (RR) that function as transcription factors in two component signaling pathways are crucial for ensuring tight regulation and coordinated expression of the genome. Currently, consensus DNA binding sites in the promoter for very few bacterial RRs have been identified. A systematic method to characterize these DNA binding sites for RRs would enable prediction of specific gene expression patterns in response to extracellular stimuli. To identify RR DNA binding sites, we functionally activated RRs using beryllofluoride and applied them to a protein-binding microarray (PBM) to discover DNA binding motifs for RRs expressed in Burkholderia, a Gram-negative bacterial genus. We identified DNA binding motifs for conserved RRs in Burkholderia thailandensis, including KdpE, RisA, and NarL, as well as for a previously uncharacterized RR at locus BTH_II2335 and its ortholog in the human pathogen Burkholderia pseudomallei at locus BPSS2315. We further demonstrate RR binding of predicted genomic targets for the two orthologs using gel shift assays and reveal a pattern of RR regulation of expression of self and other two component systems. Our studies illustrate the use of PBMs to identify DNA binding specificities for bacterial RRs and enable prediction of gene regulatory networks in response to two component signaling. JF - Journal of Microbiological Methods AU - Nowak-Lovato, Kristy L AU - Hickmott, Alexana J AU - Maity, Tuhin S AU - Bulyk, Martha L AU - Dunbar, John AU - Hong-Geller, Elizabeth AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States, ehong@lanl.gov Y1 - 2012/07// PY - 2012 DA - Jul 2012 SP - 46 EP - 52 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 90 IS - 1 SN - 0167-7012, 0167-7012 KW - Microbiology Abstracts B: Bacteriology; Biochemistry Abstracts 2: Nucleic Acids; Microbiology Abstracts A: Industrial & Applied Microbiology KW - Burkholderia pseudomallei KW - Genomes KW - Self KW - Pathogens KW - DNA microarrays KW - Burkholderia thailandensis KW - Gene expression KW - Promoters KW - Transcription factors KW - DNA KW - genomics KW - Signal transduction KW - J 02310:Genetics & Taxonomy KW - N 14810:Methods KW - A 01300:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1020853199?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Microbiological+Methods&rft.atitle=DNA+binding+site+analysis+of+Burkholderia+thailandensis+response+regulators&rft.au=Nowak-Lovato%2C+Kristy+L%3BHickmott%2C+Alexana+J%3BMaity%2C+Tuhin+S%3BBulyk%2C+Martha+L%3BDunbar%2C+John%3BHong-Geller%2C+Elizabeth&rft.aulast=Nowak-Lovato&rft.aufirst=Kristy&rft.date=2012-07-01&rft.volume=90&rft.issue=1&rft.spage=46&rft.isbn=&rft.btitle=&rft.title=Journal+of+Microbiological+Methods&rft.issn=01677012&rft_id=info:doi/10.1016%2Fj.mimet.2012.03.019 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-06-01 N1 - Last updated - 2013-09-09 N1 - SubjectsTermNotLitGenreText - Gene expression; Genomes; Promoters; Transcription factors; DNA; Self; genomics; Pathogens; DNA microarrays; Signal transduction; Burkholderia thailandensis; Burkholderia pseudomallei DO - http://dx.doi.org/10.1016/j.mimet.2012.03.019 ER - TY - JOUR T1 - Comprehensive analysis of the effects of CdSe quantum dot size, surface charge, and functionalization on primary human lung cells. AN - 1022377475; 22587339 AB - The growing potential of quantum dots (QDs) in applications as diverse as biomedicine and energy has provoked much dialogue about their conceivable impact on human health and the environment at large. Consequently, there has been an urgent need to understand their interaction with biological systems. Parameters such as size, composition, surface charge, and functionalization can be modified in ways to either enhance biocompatibility or reduce their deleterious effects. In the current study, we simultaneously compared the impact of size, charge, and functionalization alone or in combination on biological responses using primary normal human bronchial epithelial cells. Using a suite of cellular end points and gene expression analysis, we determined the biological impact of each of these properties. Our results suggest that positively charged QDs are significantly more cytotoxic compared to negative QDs. Furthermore, while QDs functionalized with long ligands were found to be more cytotoxic than those functionalized with short ligands, negative QDs functionalized with long ligands also demonstrated size-dependent cytotoxicity. We conclude that QD-elicited cytotoxicity is not a function of a single property but a combination of factors. The mechanism of toxicity was found to be independent of reactive oxygen species formation, as cellular viability could not be rescued in the presence of the antioxidant n-acetyl cysteine. Further exploring these responses at the molecular level, we found that the relatively benign negative QDs increased gene expression of proinflammatory cytokines and those associated with DNA damage, while the highly toxic positive QDs induced changes in genes associated with mitochondrial function. In an attempt to tentatively "rank" the contribution of each property in the observed QD-induced responses, we concluded that QD charge and ligand length, and to a lesser extent, size, are key factors that should be considered when engineering nanomaterials with minimal bioimpact (charge > functionalization > size). JF - ACS nano AU - Nagy, Amber AU - Steinbrück, Andrea AU - Gao, Jun AU - Doggett, Norman AU - Hollingsworth, Jennifer A AU - Iyer, Rashi AD - Biosecurity and Public Health, Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. Y1 - 2012/06/26/ PY - 2012 DA - 2012 Jun 26 SP - 4748 EP - 4762 VL - 6 IS - 6 KW - Cadmium Compounds KW - 0 KW - Selenium Compounds KW - titanium dioxide KW - 15FIX9V2JP KW - cadmium selenide KW - A7F646JC5C KW - Titanium KW - D1JT611TNE KW - Index Medicus KW - Static Electricity KW - Cell Proliferation -- drug effects KW - Cell Survival -- drug effects KW - Particle Size KW - Humans KW - Materials Testing KW - Cell Line KW - Selenium Compounds -- toxicity KW - Quantum Dots KW - Titanium -- chemistry KW - Cadmium Compounds -- toxicity KW - Bronchi -- drug effects UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1022377475?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=ACS+nano&rft.atitle=Comprehensive+analysis+of+the+effects+of+CdSe+quantum+dot+size%2C+surface+charge%2C+and+functionalization+on+primary+human+lung+cells.&rft.au=Nagy%2C+Amber%3BSteinbr%C3%BCck%2C+Andrea%3BGao%2C+Jun%3BDoggett%2C+Norman%3BHollingsworth%2C+Jennifer+A%3BIyer%2C+Rashi&rft.aulast=Nagy&rft.aufirst=Amber&rft.date=2012-06-26&rft.volume=6&rft.issue=6&rft.spage=4748&rft.isbn=&rft.btitle=&rft.title=ACS+nano&rft.issn=1936-086X&rft_id=info:doi/10.1021%2Fnn204886b LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2012-11-07 N1 - Date created - 2012-06-26 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/nn204886b ER - TY - JOUR T1 - Puncturing Mars; how impact craters interact with the Martian cryosphere AN - 1080607813; 2012-083873 AB - Geologic evidence suggests that the Martian surface and atmospheric conditions underwent major changes in the late Noachian, with a decline in observable water-related surface features, suggestive of a transition to a dryer and colder climate. Based on that assumption, we have modeled the consequences of impacts into a approximately 2-6 km-thick cryosphere. We calculate that medium-sized (few 10 s of km diameter) impact craters can physically and/or thermally penetrate through this cryosphere, creating liquid water through the melting of subsurface ice in an otherwise dry and frozen environment. The interaction of liquid water with the target rock produces alteration phases that thermochemical modeling predicts will include hydrous silicates (e.g., nontronite, chlorite, serpentine). Thus, even small impact craters are environments that combine liquid water and the presence of alteration minerals that make them potential sites for life to proliferate. Expanding on the well-known effects of large impact craters on target sites, we conclude that craters as small as approximately 5-20 km (depending on latitude) excavate large volumes of material from the subsurface while delivering sufficient heat to create liquid water (through the melting of ground ice) and drive hydrothermal activity. This connection between the surface and subsurface made by the formation of these small, and thus more frequent, impact craters may also represent the most favorable sites to test the hypothesis of life on early Mars. JF - Earth and Planetary Science Letters AU - Schwenzer, S P AU - Abramov, O AU - Allen, C C AU - Clifford, S M AU - Cockell, C S AU - Filiberto, J AU - Kring, D A AU - Lasue, J AU - McGovern, P J AU - Newsom, H E AU - Treiman, A H AU - Vaniman, D T AU - Wiens, R C Y1 - 2012/06/15/ PY - 2012 DA - 2012 Jun 15 SP - 9 EP - 17 PB - Elsevier, Amsterdam VL - 335-336 SN - 0012-821X, 0012-821X KW - water KW - hydrates KW - cratering KW - cryosphere KW - Noachian KW - impact features KW - atmosphere KW - astrobiology KW - Mars KW - impacts KW - paleoclimatology KW - melts KW - climate change KW - terrestrial planets KW - aqueous alteration KW - planets KW - melting KW - craters KW - ice KW - impact craters KW - meltwater KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080607813?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Earth+and+Planetary+Science+Letters&rft.atitle=Puncturing+Mars%3B+how+impact+craters+interact+with+the+Martian+cryosphere&rft.au=Schwenzer%2C+S+P%3BAbramov%2C+O%3BAllen%2C+C+C%3BClifford%2C+S+M%3BCockell%2C+C+S%3BFiliberto%2C+J%3BKring%2C+D+A%3BLasue%2C+J%3BMcGovern%2C+P+J%3BNewsom%2C+H+E%3BTreiman%2C+A+H%3BVaniman%2C+D+T%3BWiens%2C+R+C&rft.aulast=Schwenzer&rft.aufirst=S&rft.date=2012-06-15&rft.volume=335-336&rft.issue=&rft.spage=9&rft.isbn=&rft.btitle=&rft.title=Earth+and+Planetary+Science+Letters&rft.issn=0012821X&rft_id=info:doi/10.1016%2Fj.epsl.2012.04.031 L2 - http://www.sciencedirect.com/science/journal/0012821X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 94 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-09-27 N1 - CODEN - EPSLA2 N1 - SubjectsTermNotLitGenreText - aqueous alteration; astrobiology; atmosphere; climate change; cratering; craters; cryosphere; hydrates; ice; impact craters; impact features; impacts; Mars; melting; melts; meltwater; Noachian; paleoclimatology; planets; terrestrial planets; water DO - http://dx.doi.org/10.1016/j.epsl.2012.04.031 ER - TY - JOUR T1 - Transport of Bacillus thuringiensis var. kurstaki from an Outdoor Release into Buildings: Pathways of Infiltration and a Rapid Method to Identify Contaminated Buildings AN - 1776648407; 17458563 AB - Understanding the fate and transport of biological agents into buildings will be critical to recovery and restoration efforts after a biological attack in an urban area. As part of the Interagency Biological Restoration Demonstration (IBRD), experiments were conducted in Fairfax County, VA, to study whether a biological agent can be expected to infiltrate into buildings following a wide-area release. Bacillus thuringiensis var. kurstaki is a common organic pesticide that has been sprayed in Fairfax County for a number of years to control the gypsy moth. Because the bacterium shares many physical and biological properties with Bacillus anthracis, the results from these studies can be extrapolated to a bioterrorist release. In 2009, samples were collected from inside buildings located immediately adjacent to a spray block. A combined probabilistic and targeted sampling strategy and modeling were conducted to provide insight into likely methods of infiltration. Both the simulations and the experimental results indicate sampling entryways and heating, ventilation, and air conditioning (HVAC) filters are reasonable methods for "ruling in" a building as contaminated. Following a biological attack, this method is likely to provide significant savings in time and labor compared to more rigorous, statistically based characterization. However, this method should never be used to "rule out," or clear, a building. JF - Biosecurity and Bioterrorism AU - Van Cuyk, S AU - Deshpande, A AU - Hollander, A AU - Franco, DO AU - Teclemariam, N P AU - Layshock, JA AU - Ticknor, LO AU - Brown, MJ AU - Omberg, K M AD - Los Alamos National Laboratory, Systems Engineering & Integration Group, Box 1663, Los Alamos, NM 87545, USA, svancuyk@lanl.gov Y1 - 2012/06/12/ PY - 2012 DA - 2012 Jun 12 SP - 215 EP - 227 VL - 10 IS - 2 SN - 1538-7135, 1538-7135 KW - Microbiology Abstracts B: Bacteriology KW - Filters KW - Ventilation KW - Air conditioning KW - bioterrorism KW - Bacillus thuringiensis KW - Pesticides KW - Sampling KW - Bacillus anthracis KW - J 02410:Animal Diseases UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1776648407?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Biosecurity+and+Bioterrorism&rft.atitle=Transport+of+Bacillus+thuringiensis+var.+kurstaki+from+an+Outdoor+Release+into+Buildings%3A+Pathways+of+Infiltration+and+a+Rapid+Method+to+Identify+Contaminated+Buildings&rft.au=Van+Cuyk%2C+S%3BDeshpande%2C+A%3BHollander%2C+A%3BFranco%2C+DO%3BTeclemariam%2C+N+P%3BLayshock%2C+JA%3BTicknor%2C+LO%3BBrown%2C+MJ%3BOmberg%2C+K+M&rft.aulast=Van+Cuyk&rft.aufirst=S&rft.date=2012-06-12&rft.volume=10&rft.issue=2&rft.spage=215&rft.isbn=&rft.btitle=&rft.title=Biosecurity+and+Bioterrorism&rft.issn=15387135&rft_id=info:doi/10.1089%2Fbsp.2011.0081 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-03-01 N1 - Last updated - 2016-04-13 N1 - SubjectsTermNotLitGenreText - Filters; Ventilation; bioterrorism; Air conditioning; Pesticides; Sampling; Bacillus thuringiensis; Bacillus anthracis DO - http://dx.doi.org/10.1089/bsp.2011.0081 ER - TY - JOUR T1 - An efficient matrix-free algorithm for the ensemble Kalman filter AN - 1832624216; 641043-3 AB - In this work, we present an efficient matrix-free ensemble Kalman filter (EnKF) algorithm for the assimilation of large data sets. The EnKF has increasingly become an essential tool for data assimilation of numerical models. It is an attractive assimilation method because it can evolve the model covariance matrix for a non-linear model, through the use of an ensemble of model states, and it is easy to implement for any numerical model. Nevertheless, the computational cost of the EnKF can increase significantly for cases involving the assimilation of large data sets. As more data become available for assimilation, a potential bottleneck in most EnKF algorithms involves the operation of the Kalman gain matrix. To reduce the complexity and cost of assimilating large data sets, a matrix-free EnKF algorithm is proposed. The algorithm uses an efficient matrix-free linear solver, based on the Sherman-Morrison formulas, to solve the implicit linear system within the Kalman gain matrix and compute the analysis. Numerical experiments with a two-dimensional shallow water model on the sphere are presented, where results show the matrix-free implementation outperforming an singular value decomposition-based implementation in computational time. Copyright 2011 Springer Science+Business Media B.V. JF - Computational Geosciences AU - Godinez, Humberto C AU - Moulton, J David Y1 - 2012/06// PY - 2012 DA - June 2012 SP - 565 EP - 575 PB - Springer, Dordrecht VL - 16 IS - 3 SN - 1420-0597, 1420-0597 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832624216?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computational+Geosciences&rft.atitle=An+efficient+matrix-free+algorithm+for+the+ensemble+Kalman+filter&rft.au=Godinez%2C+Humberto+C%3BMoulton%2C+J+David&rft.aulast=Godinez&rft.aufirst=Humberto&rft.date=2012-06-01&rft.volume=16&rft.issue=3&rft.spage=565&rft.isbn=&rft.btitle=&rft.title=Computational+Geosciences&rft.issn=14200597&rft_id=info:doi/10.1007%2Fs10596-011-9268-9 L2 - http://www.springerlink.com/content/101744/ LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 DO - http://dx.doi.org/10.1007/s10596-011-9268-9 ER - TY - JOUR T1 - Convolution-based particle tracking method for transient flow AN - 1832619203; 641043-2 AB - A convolution-based particle tracking (CBPT) method was recently developed for calculating solute concentrations (Robinson et al., Comput Geosci 14(4): 779-792, 2010). This method is highly efficient but limited to steady-state flow conditions. Here, we present an extension of this method to transient flow conditions. This extension requires a single-particle tracking process model run, with a pulse of particles introduced at a sequence of times for each source location. The number and interval of particle releases depends upon the transients in the flow. Numerical convolution of particle paths obtained at each release time and location with a time-varying source term is performed to yield the shape of the plume. Many factors controlling transport such as variation in source terms, radioactive decay, and in some cases linear processes such as sorption and diffusion into dead-end pores can be simulated in the convolution step for Monte Carlo-based analysis of transport uncertainty. We demonstrate the efficiency of the transient CBPT method, by showing that it requires fewer particles than traditional random walk particle tracking methods to achieve the same levels of accuracy, especially as the source term increases in duration or is uncertain. Since flow calculations under transient conditions are often very expensive, this is a computationally efficient yet accurate method. Copyright 2012 Springer Science+Business Media B.V. and 2011 Springer Science+Business Media B.V. (outside the USA) JF - Computational Geosciences AU - Srinivasan, Gowri AU - Keating, Elizabeth AU - Moulton, John David AU - Dash, Zora V AU - Robinson, Bruce A Y1 - 2012/06// PY - 2012 DA - June 2012 SP - 551 EP - 563 PB - Springer, Dordrecht VL - 16 IS - 3 SN - 1420-0597, 1420-0597 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832619203?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computational+Geosciences&rft.atitle=Convolution-based+particle+tracking+method+for+transient+flow&rft.au=Srinivasan%2C+Gowri%3BKeating%2C+Elizabeth%3BMoulton%2C+John+David%3BDash%2C+Zora+V%3BRobinson%2C+Bruce+A&rft.aulast=Srinivasan&rft.aufirst=Gowri&rft.date=2012-06-01&rft.volume=16&rft.issue=3&rft.spage=551&rft.isbn=&rft.btitle=&rft.title=Computational+Geosciences&rft.issn=14200597&rft_id=info:doi/10.1007%2Fs10596-011-9265-z L2 - http://www.springerlink.com/content/101744/ LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 DO - http://dx.doi.org/10.1007/s10596-011-9265-z ER - TY - JOUR T1 - Combination Antiviral Therapy for Influenza: Predictions From Modeling of Human Infections AN - 1642621766; 20899945 AB - Emergence of resistance is a major concern in influenza antiviral treatment and prophylaxis. Combination antiviral therapy might overcome this problem. Here, we estimate that all possible single mutants and a sizeable fraction of double mutants are generated during an uncomplicated influenza infection. While most of them may sustain a fitness cost, some variants may confer drug resistance and be selected during therapy. We argue that a triple combination regimen would markedly reduce the risk of antiviral resistance emergence in seasonal and pandemic influenza viruses, especially in seriously ill or immunocompromised hosts. JF - Journal of Infectious Diseases AU - Perelson, Alan S AU - Rong, Libin AU - Hayden, Frederick G AD - Theoretical Biology and Biophysics, MS K710, Los Alamos National Laboratory, Los Alamos, NM 87545, asp@lanl.gov Y1 - 2012/06/01/ PY - 2012 DA - 2012 Jun 01 SP - 1642 EP - 1645 PB - Oxford University Press, Oxford Journals, Great Clarendon Street Oxford OX2 6DP United Kingdom VL - 205 IS - 11 SN - 0022-1899, 0022-1899 KW - Risk Abstracts; Virology & AIDS Abstracts; Health & Safety Science Abstracts KW - Prediction KW - Fitness KW - Drug resistance KW - Viruses KW - Risk reduction KW - Infection KW - Mutants KW - Influenza KW - pandemics KW - Sulfur dioxide KW - Infectious diseases KW - Immunocompromised hosts KW - Prophylaxis KW - Seasonal variations KW - V 22340:Antiviral Agents KW - R2 23060:Medical and environmental health KW - H 4000:Food and Drugs UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1642621766?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Infectious+Diseases&rft.atitle=Combination+Antiviral+Therapy+for+Influenza%3A+Predictions+From+Modeling+of+Human+Infections&rft.au=Perelson%2C+Alan+S%3BRong%2C+Libin%3BHayden%2C+Frederick+G&rft.aulast=Perelson&rft.aufirst=Alan&rft.date=2012-06-01&rft.volume=205&rft.issue=11&rft.spage=1642&rft.isbn=&rft.btitle=&rft.title=Journal+of+Infectious+Diseases&rft.issn=00221899&rft_id=info:doi/10.1093%2Finfdis%2Fjis265 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-01-01 N1 - Last updated - 2016-04-13 N1 - SubjectsTermNotLitGenreText - Fitness; Influenza; pandemics; Immunocompromised hosts; Drug resistance; Prophylaxis; Infection; Prediction; Sulfur dioxide; Infectious diseases; Viruses; Risk reduction; Seasonal variations; Mutants DO - http://dx.doi.org/10.1093/infdis/jis265 ER - TY - JOUR T1 - Using combinations of oxidants and bases as PCET reactants: thermochemical and practical considerations AN - 1642304741; 20845013 AB - Studies in proton-coupled electron transfer (PCET) often require the combination of an outer-sphere oxidant and a base, to remove an electron and a proton. A common problem is the incompatibility of the oxidant and the base, because the former is electron deficient and the latter electron rich. We have tested a variety of reagents and report a number of oxidant/base combinations that are compatible and therefore potentially useful as PCET reagents. A formal bond dissociation free energy (BDFE) for a reagent combination is defined by the redox potential of the oxidant and pK sub(a) of the base. This is a formalBDFE because no X-H bond is homolytically cleaved, but it is a very useful way to categorize the H super( times ) accepting ability of an oxidant/base PCET pair. Formal BDFEs of stable oxidant/base combinations range from 71 to at least 98 kcal mol super(-1). Effects of solvent, concentration, temperature, and counterions on the stability of the oxidant/base combinations are discussed. Extensions to catalysis and related reductant/acid combinations are mentioned. JF - Energy & Environmental Science AU - Waidmann, Christopher R AU - Miller, Alexander JM AU - Ng, Cheuk-Wa Angela AU - Scheuermann, Margaret L AU - Porter, Thomas R AU - Tronic, Tristan A AU - Mayer, James M AD - Chemistry Division; Los Alamos National Laboratory; Los Alamos; New Mexico; 87545; USA waidmann@lanl.gov Y1 - 2012/06// PY - 2012 DA - Jun 2012 SP - 7771 EP - 7780 PB - Royal Society of Chemistry, c/o Springer-Verlag New York Inc. Secaucus New Jersey 07096 2485 United States VL - 5 IS - 7 SN - 1754-5692, 1754-5692 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA) KW - Compatibility KW - Bonding KW - Solvents KW - Incompatibility KW - Stability KW - Oxidants KW - Free energy KW - Oxidizing agents UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1642304741?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Energy+%26+Environmental+Science&rft.atitle=Using+combinations+of+oxidants+and+bases+as+PCET+reactants%3A+thermochemical+and+practical+considerations&rft.au=Waidmann%2C+Christopher+R%3BMiller%2C+Alexander+JM%3BNg%2C+Cheuk-Wa+Angela%3BScheuermann%2C+Margaret+L%3BPorter%2C+Thomas+R%3BTronic%2C+Tristan+A%3BMayer%2C+James+M&rft.aulast=Waidmann&rft.aufirst=Christopher&rft.date=2012-06-01&rft.volume=5&rft.issue=7&rft.spage=7771&rft.isbn=&rft.btitle=&rft.title=Energy+%26+Environmental+Science&rft.issn=17545692&rft_id=info:doi/10.1039%2Fc2ee03300c LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-12-01 N1 - Number of references - 89 N1 - Last updated - 2015-08-04 DO - http://dx.doi.org/10.1039/c2ee03300c ER - TY - JOUR T1 - Inferring likelihoods and climate system characteristics from climate models and multiple tracers AN - 1560106572; 20610975 AB - Characterizing the risks of anthropogenic climate change poses considerable statistical challenges. A key problem is how to combine the information contained in large-scale observational data sets with simulations of Earth system models in a statistically sound and computationally tractable manner. Here, we describe a statistical approach for improving projections of the North Atlantic meridional overturning circulation (AMOC). The AMOC is part of the global ocean conveyor belt circulation and transfers heat between low and high latitudes in the Atlantic basin. The AMOC might collapse in a "tipping point" response to anthropogenic climate forcings. Assessing the risk of an AMOC collapse is of considerable interest because it may result in major impacts on natural and human systems. AMOC projections rely on simulations from complex climate models. One key source of uncertainty in AMOC projections is uncertainty about background ocean vertical diffusivity (K sub(v)), an important model parameter. K sub(v) cannot be directly observed but can be inferred by combining climate model output with observations on the oceans (so-called tracers). Here, we combine information from multiple tracers, each observed on a spatial grid. Our two-stage approach emulates the computationally expensive climate model using a flexible hierarchical model to connect the tracers. We then infer K sub(v) using our emulator and the observations via a Bayesian approach, accounting for observation error and model discrepancy. We utilize kernel mixing and matrix identities in our Gaussian process model to considerably reduce the computational burdens imposed by the large data sets. We find that our approach is flexible, reduces identifiability issues, and enables inference about K sub(v) based on large data sets. We use the resulting inference about K sub(v) to improve probabilistic projections of the AMOC. Copyright copyright 2012 John Wiley & Sons, Ltd. JF - Environmetrics AU - Sham Bhat, K AU - Haran, Murali AU - Olson, Roman AU - Keller, Klaus AD - Statistical Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A., bhat9999@lanl.gov Y1 - 2012/06// PY - 2012 DA - June 2012 SP - 345 EP - 362 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 23 IS - 4 SN - 1180-4009, 1180-4009 KW - Meteorological & Geoastrophysical Abstracts; Risk Abstracts; Sustainability Science Abstracts; Environment Abstracts KW - Risk assessment KW - Meridional overturning circulation KW - Climate models KW - Climate change KW - Anthropogenic factors KW - Statistical analysis KW - Simulation KW - Basins KW - Atmospheric circulation KW - AN, North Atlantic KW - Anthropogenic climate changes KW - Tracers KW - Numerical simulations KW - Oceans KW - Latitude KW - Oceanographic data KW - M2 551.583:Variations (551.583) KW - M3 1010:Issues in Sustainable Development KW - ENA 12:Oceans & Estuaries KW - R2 23010:General: Models, forecasting UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1560106572?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmetrics&rft.atitle=Inferring+likelihoods+and+climate+system+characteristics+from+climate+models+and+multiple+tracers&rft.au=Sham+Bhat%2C+K%3BHaran%2C+Murali%3BOlson%2C+Roman%3BKeller%2C+Klaus&rft.aulast=Sham+Bhat&rft.aufirst=K&rft.date=2012-06-01&rft.volume=23&rft.issue=4&rft.spage=345&rft.isbn=&rft.btitle=&rft.title=Environmetrics&rft.issn=11804009&rft_id=info:doi/10.1002%2Fenv.2149 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-09-01 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Meridional overturning circulation; Climate models; Numerical simulations; Statistical analysis; Atmospheric circulation; Anthropogenic climate changes; Oceanographic data; Risk assessment; Tracers; Oceans; Climate change; Anthropogenic factors; Basins; Latitude; Simulation; AN, North Atlantic DO - http://dx.doi.org/10.1002/env.2149 ER - TY - JOUR T1 - The first planets; the critical metallicity for planet formation AN - 1502292469; 2014-013489 AB - A rapidly growing body of observational results suggests that planet formation takes place preferentially at high metallicity. In the core accretion model of planet formation this is expected because heavy elements are needed to form the dust grains which settle into the midplane of the protoplanetary disk and coagulate to form the planetesimals from which planetary cores are assembled. As well, there is observational evidence that the lifetimes of circumstellar disks are shorter at lower metallicities, likely due to greater susceptibility to photoevaporation. Here we estimate the minimum metallicity for planet formation, by comparing the timescale for dust grain growth and settling to that for disk photoevaporation. For a wide range of circumstellar disk models and dust grain properties, we find that the critical metallicity above which planets can form is a function of the distance r at which the planet orbits its host star. With the iron abundance relative to that of the Sun [Fe/H] as a proxy for the metallicity, we estimate a lower limit for the critical abundance for planet formation of [Fe/H] (sub crit) approximately -1.5+log (r/1 AU), where an astronomical unit (AU) is the distance between the Earth and the Sun. This prediction is in agreement with the available observational data, and carries implications for the properties of the first planets and for the emergence of life in the early universe. In particular, it implies that the first Earth-like planets likely formed from circumstellar disks with metallicities Z> or =0.1 Z (sub []) . If planets are found to orbit stars with metallicities below the critical metallicity, this may be a strong challenge to the core accretion model. Copyright (Copyright) 2012. The American Astronomical Society. All rights reserved. JF - The = Astrophysical Journal AU - Johnson, Jarrett L AU - Li, Hui Y1 - 2012/06/01/ PY - 2012 DA - 2012 Jun 01 EP - paper 81 PB - University of Chicago Press for the American Astronomical Society, Chicago, IL VL - 751 IS - 2 SN - 0004-637X, 0004-637X KW - accretion KW - planetesimals KW - protoplanetary disk KW - iron KW - terrestrial planets KW - models KW - planets KW - cosmic dust KW - metals KW - early universe KW - planetology KW - core KW - photoevaporation KW - circumstellar disk KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1502292469?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+%3D+Astrophysical+Journal&rft.atitle=The+first+planets%3B+the+critical+metallicity+for+planet+formation&rft.au=Johnson%2C+Jarrett+L%3BLi%2C+Hui&rft.aulast=Johnson&rft.aufirst=Jarrett&rft.date=2012-06-01&rft.volume=751&rft.issue=2&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+%3D+Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F751%2F2%2F81 L2 - http://iopscience.iop.org/0004-637X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 87 N1 - PubXState - IL N1 - Document feature - illus. N1 - SuppNotes - Includes appendices N1 - Last updated - 2014-02-27 N1 - SubjectsTermNotLitGenreText - accretion; circumstellar disk; core; cosmic dust; early universe; iron; metals; models; photoevaporation; planetesimals; planetology; planets; protoplanetary disk; terrestrial planets DO - http://dx.doi.org/10.1088/0004-637X/751/2/81 ER - TY - JOUR T1 - Carbon sequestration and natural analogs AN - 1270037667; 2013-010227 JF - Geology (Boulder) AU - Fessenden, Julianna Y1 - 2012/06// PY - 2012 DA - June 2012 SP - 575 EP - 576 PB - Geological Society of America (GSA), Boulder, CO VL - 40 IS - 6 SN - 0091-7613, 0091-7613 KW - carbon sequestration KW - human activity KW - pumping KW - atmosphere KW - power plants KW - geochemical cycle KW - gases KW - carbon dioxide KW - gas injection KW - controls KW - deep drilling KW - carbon KW - natural analogs KW - drilling KW - carbon cycle KW - industry KW - 22:Environmental geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270037667?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geology+%28Boulder%29&rft.atitle=Carbon+sequestration+and+natural+analogs&rft.au=Fessenden%2C+Julianna&rft.aulast=Fessenden&rft.aufirst=Julianna&rft.date=2012-06-01&rft.volume=40&rft.issue=6&rft.spage=575&rft.isbn=&rft.btitle=&rft.title=Geology+%28Boulder%29&rft.issn=00917613&rft_id=info:doi/10.1130%2Ffocus062012.1 L2 - http://www.gsajournals.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 30 N1 - PubXState - CO N1 - Last updated - 2013-01-17 N1 - CODEN - GLGYBA N1 - SubjectsTermNotLitGenreText - atmosphere; carbon; carbon cycle; carbon dioxide; carbon sequestration; controls; deep drilling; drilling; gas injection; gases; geochemical cycle; human activity; industry; natural analogs; power plants; pumping DO - http://dx.doi.org/10.1130/focus062012.1 ER - TY - JOUR T1 - SAGE at 30 AN - 1033532198; 2012-073296 AB - As you receive this issue of The Leading Edge the Summer of Applied Geophysical Experience (SAGE) will be starting our 30th field season. SAGE is a unique educational program that combines teaching and research as a partnership between universities, industry, government agencies and professional societies. SAGE includes a four-week period based in Santa Fe, New Mexico and one-week workshop in the following January for undergraduates, at San Diego State University, which allows us to enhance their research experience. We teach the principles and applications of refraction and reflection seismics, magnetics, gravity, GPS, several electromagnetic (EM) methods and ground-penetrating radar (GPR) in a field-based, hands-on setting. The central research activity of SAGE is the acquisition and interpretation of geophysical field data. Students learn geophysics by doing geophysics--a discovery oriented approach. JF - Leading Edge (Tulsa, OK) AU - Baldridge, W Scott AU - Braile, Lawrence W AU - Biehler, Shawn AU - Jiracek, George R AU - Ferguson, John F AU - Hasterok, Derrick AU - Pellerin, Louise AU - Bedrosian, Paul A AU - McPhee, Darcy K AU - Snelson, Catherine M AU - Clark, Dean Y1 - 2012/06// PY - 2012 DA - June 2012 SP - 702 EP - 708 PB - Society of Exploration Geophysicists, Tulsa, OK VL - 31 IS - 6 SN - 1070-485X, 1070-485X KW - case studies KW - programs KW - college-level education KW - SAGE KW - geophysical methods KW - education KW - Summer of Applied Geophysical Experience KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1033532198?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Leading+Edge+%28Tulsa%2C+OK%29&rft.atitle=SAGE+at+30&rft.au=Baldridge%2C+W+Scott%3BBraile%2C+Lawrence+W%3BBiehler%2C+Shawn%3BJiracek%2C+George+R%3BFerguson%2C+John+F%3BHasterok%2C+Derrick%3BPellerin%2C+Louise%3BBedrosian%2C+Paul+A%3BMcPhee%2C+Darcy+K%3BSnelson%2C+Catherine+M%3BClark%2C+Dean&rft.aulast=Baldridge&rft.aufirst=W&rft.date=2012-06-01&rft.volume=31&rft.issue=6&rft.spage=702&rft.isbn=&rft.btitle=&rft.title=Leading+Edge+%28Tulsa%2C+OK%29&rft.issn=1070485X&rft_id=info:doi/10.1190%2Ftle31060702.1 L2 - http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1745-6592 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 10 N1 - PubXState - OK N1 - Document feature - illus. incl. sect., sketch maps N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - case studies; college-level education; education; geophysical methods; programs; SAGE; Summer of Applied Geophysical Experience DO - http://dx.doi.org/10.1190/tle31060702.1 ER - TY - JOUR T1 - Soil Fungal Cellobiohydrolase I Gene (cbhI) Composition and Expression in a Loblolly Pine Plantation under Conditions of Elevated Atmospheric CO2 and Nitrogen Fertilization AN - 1028032007; 16833330 AB - The simultaneous increase of atmospheric CO2 and nitrogen (N) deposition to terrestrial ecosystems is predicted to alter plant productivity and, consequently, to change the amount and quality of above- and belowground carbon entering forest soils. It is not known how such changes will impact the composition and function of soil fungal communities that play a key role in degrading complex carbon. We sequenced the fungal cellobiohydrolase I gene (cbhI) from soil DNA and cDNA to compare the richness and composition of resident and expressed cbhI genes at a U.S. Department of Energy free air-carbon dioxide enrichment (FACE) site (NC), which had been exposed to elevated atmospheric CO2 and/or N fertilization treatment for several years. Our results provide evidence that the richness and composition of the cellulolytic fungi surveyed in this study were distinct in the DNA- and cDNA-based gene surveys and were dominated by Basidiomycota that have low or no representation in public databases. The surveys did not detect differences in richness or phylum-level composition of cbhI-containing, cellulolytic fungi that correlated with elevated CO2 or N fertilization at the time of sampling. JF - Applied and Environmental Microbiology AU - Weber, Carolyn F AU - Moya Balasch, Monica AU - Gossage, Zachary AU - Porras-Alfaro, Andrea AU - Kuske, Cheryl R AD - Los Alamos National Laboratory, Bioscience Division, Los Alamos, New Mexico, USA, CherylR.Kuske,kuske{at}lanl.gov. Y1 - 2012/06// PY - 2012 DA - Jun 2012 SP - 3950 EP - 3957 PB - American Society for Microbiology, 1752 N Street N.W. Washington, DC 20036 United States VL - 78 IS - 11 SN - 0099-2240, 0099-2240 KW - Microbiology Abstracts C: Algology, Mycology & Protozoology; Microbiology Abstracts A: Industrial & Applied Microbiology KW - Carbon KW - Carbon dioxide KW - A:01390 KW - K:03310 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1028032007?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologya&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Applied+and+Environmental+Microbiology&rft.atitle=Soil+Fungal+Cellobiohydrolase+I+Gene+%28cbhI%29+Composition+and+Expression+in+a+Loblolly+Pine+Plantation+under+Conditions+of+Elevated+Atmospheric+CO2+and+Nitrogen+Fertilization&rft.au=Weber%2C+Carolyn+F%3BMoya+Balasch%2C+Monica%3BGossage%2C+Zachary%3BPorras-Alfaro%2C+Andrea%3BKuske%2C+Cheryl+R&rft.aulast=Weber&rft.aufirst=Carolyn&rft.date=2012-06-01&rft.volume=78&rft.issue=11&rft.spage=3950&rft.isbn=&rft.btitle=&rft.title=Applied+and+Environmental+Microbiology&rft.issn=00992240&rft_id=info:doi/10.1128%2FAEM.08018-11 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-07-01 N1 - Number of references - 1 N1 - Last updated - 2014-02-21 N1 - SubjectsTermNotLitGenreText - Carbon dioxide DO - http://dx.doi.org/10.1128/AEM.08018-11 ER - TY - JOUR T1 - Complete Genome Sequence of Francisella philomiragia ATCC 25017 AN - 1028023741; 16833601 AB - Francisella philomiragia is a saprophytic gammaproteobacterium found only occasionally in immunocompromised individuals and is the nearest neighbor to the causative agent of tularemia and category A select agent Francisella tularensis. To shed insight into the key genetic differences and the evolution of these two distinct lineages, we sequenced the first complete genome of F. philomiragia strain ATCC 25017, which was isolated as a free-living microorganism from water in Bear River Refuge, Utah. JF - Journal of Bacteriology AU - Zeytun, Ahmet AU - Malfatti, Stephanie A AU - Vergez, Lisa M AU - Shin, Maria AU - Garcia, Emilio AU - Chain, Patrick SG AD - Genome Sciences, Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA, PatrickS.G.Chain,pchain{at}lanl.gov. Y1 - 2012/06// PY - 2012 DA - Jun 2012 SP - 3266 PB - American Society for Microbiology, 1752 N Street N.W. Washington, DC 20036 United States VL - 194 IS - 12 SN - 0021-9193, 0021-9193 KW - Microbiology Abstracts B: Bacteriology KW - Genomes KW - Rivers KW - Tularemia KW - Nucleotide sequence KW - Microorganisms KW - Francisella tularensis KW - Evolution KW - J 02310:Genetics & Taxonomy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1028023741?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Bacteriology&rft.atitle=Complete+Genome+Sequence+of+Francisella+philomiragia+ATCC+25017&rft.au=Zeytun%2C+Ahmet%3BMalfatti%2C+Stephanie+A%3BVergez%2C+Lisa+M%3BShin%2C+Maria%3BGarcia%2C+Emilio%3BChain%2C+Patrick+SG&rft.aulast=Zeytun&rft.aufirst=Ahmet&rft.date=2012-06-01&rft.volume=194&rft.issue=12&rft.spage=3266&rft.isbn=&rft.btitle=&rft.title=Journal+of+Bacteriology&rft.issn=00219193&rft_id=info:doi/10.1128%2FJB.00413-12 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-07-01 N1 - Number of references - 8 N1 - Last updated - 2013-07-15 N1 - SubjectsTermNotLitGenreText - Rivers; Genomes; Tularemia; Nucleotide sequence; Microorganisms; Evolution; Francisella tularensis DO - http://dx.doi.org/10.1128/JB.00413-12 ER - TY - JOUR T1 - Microseismic swarm activity in the New Madrid seismic zone AN - 1026862472; 2012-065545 AB - We analyze event archives and continuous waveform data recorded by the Cooperative New Madrid Seismic Network from 1995 to 2008 in conjunction with waveform cross-correlation techniques to investigate the spatiotemporal distribution of small-magnitude (M (sub D) <2.4) earthquakes in the New Madrid Seismic Zone (NMSZ). The resulting clusters are divided into two major groups based on the interevent time period: (1) swarm clusters, in which the number of highly similar events recorded in a day is more than the seismic zone maximum daily rate ( approximately 3 events/day) and (2) repeating earthquakes clusters, which consist of highly similar events separated by longer time periods. Most swarm clusters occur near Ridgely, Tennessee, and this 4-km X 2-km X 2-km elongated source zone produces swarms every 1-3 years that contain large numbers of strikingly similar events. Other swarms and repeating earthquake clusters occur at proposed fault intersections in the crystalline basement or along strong velocity contrasts. Focal mechanism solutions for NMSZ clusters are consistent with previously reported solutions for each major fault. We suggest that anomalously high pore-fluid pressure, inferred from artesian wells, porous intrusions, and faulted, fractured crustal rocks, is the most likely cause of swarm activity. Repeating earthquake ruptures are interpreted as reactivation of small asperities. JF - Bulletin of the Seismological Society of America AU - Bisrat, Shishay AU - DeShon, Heather R AU - Rowe, Charlotte Y1 - 2012/06// PY - 2012 DA - June 2012 SP - 1167 EP - 1178 PB - Seismological Society of America, Berkeley, CA VL - 102 IS - 3 SN - 0037-1106, 0037-1106 KW - United States KW - Reelfoot Rift KW - focal mechanism KW - technology KW - swarms KW - asperities KW - Missouri KW - Mississippi Embayment KW - statistical analysis KW - magnitude KW - New Madrid region KW - seismic zoning KW - seismicity KW - crosscorrelation KW - Tennessee KW - tectonics KW - earthquakes KW - seismotectonics KW - faults KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1026862472?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America&rft.atitle=Microseismic+swarm+activity+in+the+New+Madrid+seismic+zone&rft.au=Bisrat%2C+Shishay%3BDeShon%2C+Heather+R%3BRowe%2C+Charlotte&rft.aulast=Bisrat&rft.aufirst=Shishay&rft.date=2012-06-01&rft.volume=102&rft.issue=3&rft.spage=1167&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120100315 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Seismological Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 65 N1 - PubXState - CA N1 - Document feature - illus. incl. 4 tables, geol. sketch maps N1 - Last updated - 2012-07-19 N1 - SubjectsTermNotLitGenreText - asperities; crosscorrelation; earthquakes; faults; focal mechanism; magnitude; Mississippi Embayment; Missouri; New Madrid region; Reelfoot Rift; seismic zoning; seismicity; seismotectonics; statistical analysis; swarms; technology; tectonics; Tennessee; United States DO - http://dx.doi.org/10.1785/0120100315 ER - TY - JOUR T1 - phenix.mr_rosetta: molecular replacement and model rebuilding with Phenix and Rosetta AN - 1024661192; 16839084 AB - The combination of algorithms from the structure-modeling field with those of crystallographic structure determination can broaden the range of templates that are useful for structure determination by the method of molecular replacement. Automated tools in phenix.mr_rosetta simplify the application of these combined approaches by integrating Phenix crystallographic algorithms and Rosetta structure-modeling algorithms and by systematically generating and evaluating models with a combination of these methods. The phenix.mr_rosetta algorithms can be used to automatically determine challenging structures. The approaches used in phenix.mr_rosetta are described along with examples that show roles that structure-modeling can play in molecular replacement. JF - Journal of Structural and Functional Genomics AU - Terwilliger, Thomas C AU - DiMaio, Frank AU - Read, Randy J AU - Baker, David AU - Bunkoczi, Gabor AU - Adams, Paul D AU - Grosse-Kunstleve, Ralf W AU - Afonine, Pavel V AU - Echols, Nathaniel AD - Los Alamos Institutes and BioScience Division, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA, terwilliger1@earthlink.net Y1 - 2012/06// PY - 2012 DA - Jun 2012 SP - 81 EP - 90 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 13 IS - 2 SN - 1345-711X, 1345-711X KW - Biotechnology and Bioengineering Abstracts; Genetics Abstracts KW - Algorithms KW - Molecular modelling KW - Structure-function relationships KW - G 07880:Human Genetics KW - W 30960:Bioinformatics & Computer Applications UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1024661192?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Structural+and+Functional+Genomics&rft.atitle=phenix.mr_rosetta%3A+molecular+replacement+and+model+rebuilding+with+Phenix+and+Rosetta&rft.au=Terwilliger%2C+Thomas+C%3BDiMaio%2C+Frank%3BRead%2C+Randy+J%3BBaker%2C+David%3BBunkoczi%2C+Gabor%3BAdams%2C+Paul+D%3BGrosse-Kunstleve%2C+Ralf+W%3BAfonine%2C+Pavel+V%3BEchols%2C+Nathaniel&rft.aulast=Terwilliger&rft.aufirst=Thomas&rft.date=2012-06-01&rft.volume=13&rft.issue=2&rft.spage=81&rft.isbn=&rft.btitle=&rft.title=Journal+of+Structural+and+Functional+Genomics&rft.issn=1345711X&rft_id=info:doi/10.1007%2Fs10969-012-9129-3 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-07-01 N1 - Last updated - 2012-09-10 N1 - SubjectsTermNotLitGenreText - Molecular modelling; Structure-function relationships; Algorithms DO - http://dx.doi.org/10.1007/s10969-012-9129-3 ER - TY - JOUR T1 - Enhancement of crystallization with nucleotide ligands identified by dye-ligand affinity chromatography AN - 1024658979; 16839080 AB - Ligands interacting with Mycobacterium tuberculosis recombinant proteins were identified through use of the ability of Cibacron Blue F3GA dye to interact with nucleoside/nucleotide binding proteins, and the effects of these ligands on crystallization were examined. Co-crystallization with ligands enhanced crystallization and enabled X-ray diffraction data to be collected to a resolution of at least 2.7 Aa for 5 of 10 proteins tested. Additionally, clues about individual proteins' functions were obtained from their interactions with each of a panel of ligands. JF - Journal of Structural and Functional Genomics AU - Kim, Heungbok AU - Webster, Cecelia AU - Roberts, Justin KM AU - Kositsawat, Juthamas AU - Hung, Li-Wei AU - Terwilliger, Thomas C AU - Kim, Chang-Yub AD - Bioscience Division, Los Alamos National Laboratory, MS M888, Los Alamos, NM, 87545, USA, cykim@lanl.gov Y1 - 2012/06// PY - 2012 DA - Jun 2012 SP - 71 EP - 79 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 13 IS - 2 SN - 1345-711X, 1345-711X KW - Biochemistry Abstracts 2: Nucleic Acids; Biotechnology and Bioengineering Abstracts; Genetics Abstracts KW - Affinity chromatography KW - Crystallization KW - Data processing KW - Nucleotides KW - Structure-function relationships KW - X-ray diffraction KW - nucleosides KW - Mycobacterium tuberculosis KW - W 30925:Genetic Engineering KW - N 14845:Miscellaneous KW - G 07770:Bacteria UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1024658979?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Structural+and+Functional+Genomics&rft.atitle=Enhancement+of+crystallization+with+nucleotide+ligands+identified+by+dye-ligand+affinity+chromatography&rft.au=Kim%2C+Heungbok%3BWebster%2C+Cecelia%3BRoberts%2C+Justin+KM%3BKositsawat%2C+Juthamas%3BHung%2C+Li-Wei%3BTerwilliger%2C+Thomas+C%3BKim%2C+Chang-Yub&rft.aulast=Kim&rft.aufirst=Heungbok&rft.date=2012-06-01&rft.volume=13&rft.issue=2&rft.spage=71&rft.isbn=&rft.btitle=&rft.title=Journal+of+Structural+and+Functional+Genomics&rft.issn=1345711X&rft_id=info:doi/10.1007%2Fs10969-012-9124-8 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-07-01 N1 - Last updated - 2012-10-19 N1 - SubjectsTermNotLitGenreText - Affinity chromatography; Crystallization; Data processing; Structure-function relationships; nucleosides; X-ray diffraction; Nucleotides; Mycobacterium tuberculosis DO - http://dx.doi.org/10.1007/s10969-012-9124-8 ER - TY - JOUR T1 - Saturated-unsaturated flow in a compressible leaky-unconfined aquifer AN - 1020843944; 16794237 AB - An analytical solution is developed for three-dimensional flow towards a partially penetrating large-diameter well in an unconfined aquifer bounded below by a leaky aquitard of finite or semi-infinite extent. The analytical solution is derived using Laplace and Hankel transforms, then inverted numerically. Existing solutions for flow in leaky unconfined aquifers neglect the unsaturated zone following an assumption of instantaneous drainage due to Neuman. We extend the theory of leakage in unconfined aquifers by (1) including water flow and storage in the unsaturated zone above the water table, and (2) allowing the finite-diameter pumping well to partially penetrate the aquifer. The investigation of model-predicted results shows that aquitard leakage leads to significant departure from the unconfined solution without leakage. The investigation of dimensionless time-drawdown relationships shows that the aquitard drawdown also depends on unsaturated zone properties and the pumping-well wellbore storage effects. JF - Advances in Water Resources AU - Mishra, Phoolendra K AU - Vesselinov, Velimir V AU - Kuhlman, Kristopher L AD - Computational Earth Sciences Group, Los Alamos National Laboratory, MS T003, Los Alamos, NM 87545, USA, pkmishra@lanl.gov Y1 - 2012/06// PY - 2012 DA - June 2012 SP - 62 EP - 70 PB - Elsevier B.V., The Boulevard Kidlington Oxford OX5 1GB United Kingdom VL - 42 SN - 0309-1708, 0309-1708 KW - Environment Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Aqualine Abstracts; Meteorological & Geoastrophysical Abstracts KW - Aquifers KW - Aquifer KW - Aeration Zone KW - Drawdown KW - Water resources KW - Water table KW - Unconfined Aquifers KW - Pumping KW - Aquifer flow KW - Leakage KW - Storage effects KW - Water flow KW - Drainage KW - Groundwater flow KW - Aquitards KW - Stream flow KW - Storage KW - Geohydrology KW - Water wells KW - Groundwater KW - AQ 00001:Water Resources and Supplies KW - Q2 09422:Storage and transport KW - M2 556.18:Water Management (556.18) KW - ENA 16:Renewable Resources-Water KW - SW 6030:Hydraulic machinery UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1020843944?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Advances+in+Water+Resources&rft.atitle=Saturated-unsaturated+flow+in+a+compressible+leaky-unconfined+aquifer&rft.au=Mishra%2C+Phoolendra+K%3BVesselinov%2C+Velimir+V%3BKuhlman%2C+Kristopher+L&rft.aulast=Mishra&rft.aufirst=Phoolendra&rft.date=2012-06-01&rft.volume=42&rft.issue=&rft.spage=62&rft.isbn=&rft.btitle=&rft.title=Advances+in+Water+Resources&rft.issn=03091708&rft_id=info:doi/10.1016%2Fj.advwatres.2012.03.007 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-06-01 N1 - Last updated - 2016-03-17 N1 - SubjectsTermNotLitGenreText - Aquifer; Storage effects; Water table; Water resources; Pumping; Stream flow; Aquifers; Drawdown; Drainage; Aquitards; Groundwater flow; Aquifer flow; Storage; Leakage; Water flow; Water wells; Aeration Zone; Geohydrology; Groundwater; Unconfined Aquifers DO - http://dx.doi.org/10.1016/j.advwatres.2012.03.007 ER - TY - JOUR T1 - Generalized synthesis of hybrid metal-semiconductor nanostructures tunable from the visible to the infrared. AN - 1015463906; 22424299 AB - Hybrid superstructures allow a convenient route to the development of materials with multiple functionalities (e.g., sensor, marker, conductor) out of monofunctional (e.g., excitonic, plasmonic) building blocks. This work describes a general synthetic route to the preparation of metal|dielectric|quantum dot hybrid superstructures that have excitonic and plasmonic resonances independently tunable from the ultraviolet to the mid-infrared spectral region. We demonstrate that structural tuning can be used to control intercomponent coupling leading to the emergence of unique optical properties. We illustrate this capability by demonstrating single- and multicolor emission from coupled systems, and a significant enhancement of two-photon absorption cross sections of quantum dots. Such properties in a robust yet dispersible particle can be useful in a number of applications including bioimaging and microscopy, and in optoelectronic devices, as well as serve as a platform for fundamental studies of metal-semiconductor interactions. JF - ACS nano AU - Khanal, Bishnu P AU - Pandey, Anshu AU - Li, Liang AU - Lin, Qianglu AU - Bae, Wan Ki AU - Luo, Hongmei AU - Klimov, Victor I AU - Pietryga, Jeffrey M AD - Center for Advanced Solar Photophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. Y1 - 2012/05/22/ PY - 2012 DA - 2012 May 22 SP - 3832 EP - 3840 VL - 6 IS - 5 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1015463906?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=ACS+nano&rft.atitle=Generalized+synthesis+of+hybrid+metal-semiconductor+nanostructures+tunable+from+the+visible+to+the+infrared.&rft.au=Khanal%2C+Bishnu+P%3BPandey%2C+Anshu%3BLi%2C+Liang%3BLin%2C+Qianglu%3BBae%2C+Wan+Ki%3BLuo%2C+Hongmei%3BKlimov%2C+Victor+I%3BPietryga%2C+Jeffrey+M&rft.aulast=Khanal&rft.aufirst=Bishnu&rft.date=2012-05-22&rft.volume=6&rft.issue=5&rft.spage=3832&rft.isbn=&rft.btitle=&rft.title=ACS+nano&rft.issn=1936-086X&rft_id=info:doi/10.1021%2Fnn204932m LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2012-09-10 N1 - Date created - 2012-05-22 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/nn204932m ER - TY - JOUR T1 - Observation of 239Pu Nuclear Magnetic Resonance AN - 1808094465; 20371483 AB - Radioactive ResonanceNuclear magnetic resonance (NMR) spectroscopy and its spatially sensitive cousin, magnetic resonance imaging, have found widespread application in chemical and biological characterization studies. For the most part, these studies take advantage of the energy bifurcation manifested by hydrogen nuclei with oppositely directed spins in a strong magnetic field. More generally, many heavier elements manifest the same effect-including carbon-13, fluorine, and phosphorus. In theory, researchers have known for 50 years that plutonium nuclei have a net spin conducive to NMR. Yasuoka et al. (p. 901; see the Perspective by Albrecht-Schmitt) have now at last observed the resonance of the Pu-239 isotope in a sample of plutonium dioxide. JF - Science AU - Yasuoka, H AU - Koutroulakis, G AU - Chudo, H AU - Richmond, S AU - Veirs, D K AU - Smith, AI AU - Bauer, ED AU - Thompson, J D AU - Jarvinen, G D AU - Clark, D L AD - Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan Y1 - 2012/05/18/ PY - 2012 DA - 2012 May 18 SP - 901 EP - 904 PB - American Association for the Advancement of Science, 1200 New York Avenue, NW Washington DC 20005 United States VL - 336 IS - 6083 SN - 0036-8075, 0036-8075 KW - Solid State and Superconductivity Abstracts (SO); Environmental Engineering Abstracts (EN) KW - Magnetic fields KW - Isotopes KW - Plutonium dioxide KW - Plutonium KW - Dichroism KW - Magnetic resonance KW - Nuclei KW - Nuclear magnetic resonance UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1808094465?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Observation+of+239Pu+Nuclear+Magnetic+Resonance&rft.au=Yasuoka%2C+H%3BKoutroulakis%2C+G%3BChudo%2C+H%3BRichmond%2C+S%3BVeirs%2C+D+K%3BSmith%2C+AI%3BBauer%2C+ED%3BThompson%2C+J+D%3BJarvinen%2C+G+D%3BClark%2C+D+L&rft.aulast=Yasuoka&rft.aufirst=H&rft.date=2012-05-18&rft.volume=336&rft.issue=6083&rft.spage=901&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1220801 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-08-01 N1 - Last updated - 2016-08-03 DO - http://dx.doi.org/10.1126/science.1220801 ER - TY - JOUR T1 - Response of the Atlantic Ocean circulation to Greenland Ice Sheet melting in a strongly-eddying ocean model AN - 1017979868; 16758733 AB - The sensitivity of the Atlantic Meridional Overturning Circulation (AMOC) to high-latitude freshwater input is one of the key uncertainties in the climate system. Considering the importance of the AMOC for global heat transports, and the vulnerability of the Greenland Ice Sheet (GrIS) to global warming, assessing this sensitivity is critical for climate change projections. Here we present a unique set of computational experiments to investigate the adjustment of the AMOC to enhanced melt water from the GrIS under present-day conditions. For the first time, the response in a global, strongly-eddying ocean model is systematically compared to that of an ocean model typical of IPCC-class climate models. We find that the overall decline of the AMOC on decadal time scales is quantitatively similar (<10%) in the two configurations. Nonetheless, the transient response is significantly different, as the AMOC decline and reduction in wintertime convection is markedly more gradual and persistent in the strongly-eddying configuration. JF - Geophysical Research Letters AU - Weijer, W AU - Maltrud, ME AU - Hecht, M W AU - Dijkstra, HA AU - Kliphuis, MA AD - Los Alamos National Laboratory, Los Alamos, New Mexico, USA Y1 - 2012/05/11/ PY - 2012 DA - 2012 May 11 PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 39 IS - 9 SN - 0094-8276, 0094-8276 KW - Sustainability Science Abstracts; Oceanic Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - 4255 Oceanography: General: Numerical modeling KW - 4513 Oceanography: Physical: Decadal ocean variability KW - 4520 Oceanography: Physical: Eddies and mesoscale processes KW - 4532 Oceanography: Physical: General circulation KW - 4576 Oceanography: Physical: Western boundary currents KW - overturning circulation KW - Meridional overturning circulation KW - Convection KW - Melt water KW - Ocean models KW - Climate change KW - Greenland ice sheet KW - Convection development KW - Vulnerability KW - Heat transport KW - Modelling KW - Marine KW - Ice KW - Sensitivity KW - Climate models KW - PN, Greenland, Greenland Ice Sheet KW - Ocean circulation KW - Greenhouse effect KW - convection KW - Oceanic circulation KW - Oceans KW - Glaciation KW - Global warming KW - Q2 09243:Structure, mechanics and thermodynamics KW - M2 551.583:Variations (551.583) KW - M3 1010:Issues in Sustainable Development KW - O 2020:Hydrodynamics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1017979868?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Response+of+the+Atlantic+Ocean+circulation+to+Greenland+Ice+Sheet+melting+in+a+strongly-eddying+ocean+model&rft.au=Weijer%2C+W%3BMaltrud%2C+ME%3BHecht%2C+M+W%3BDijkstra%2C+HA%3BKliphuis%2C+MA&rft.aulast=Weijer&rft.aufirst=W&rft.date=2012-05-11&rft.volume=39&rft.issue=9&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2012GL051611 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-05-01 N1 - Number of references - 32 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Convection; Melt water; Climate change; Glaciation; Ocean circulation; Greenhouse effect; Vulnerability; Modelling; Heat transport; Meridional overturning circulation; Oceanic circulation; Climate models; Ocean models; Greenland ice sheet; Global warming; Convection development; Sensitivity; Ice; Oceans; convection; PN, Greenland, Greenland Ice Sheet; Marine DO - http://dx.doi.org/10.1029/2012GL051611 ER - TY - JOUR T1 - Binding and cell intoxication studies of anthrax lethal toxin. AN - 948891754; 22219086 AB - Anthrax lethal toxin (LT) is a major virulence factor of Bacillus anthracis. The vast majority of the anthrax toxin-related literature describes the assembly of LT as a cell-dependent process. However, some reports have provided evidence for the existence of a fully assembled LT, either in vitro or in the bloodstream of anthrax-infected animals. To follow up on this work, we present studies on fully-assembled LT. We first demonstrate facile and cell-free assembly and purification of LT. We then show that fully assembled LT binds an anthrax toxin receptor with almost 100-fold higher affinity than the protective antigen (PA) alone. Quantitative cell intoxication assays were used to determine the LD(50) (lethal dose 50) for LT. The cell-binding studies revealed that LT binds mammalian cells using a different mode from PA. Even when PA-specific receptors were blocked, fully assembled LT was able to bind the cell surface. Our studies support the existing evidence that LT fully assembles in the blood stream and can bind and intoxicate mammalian cells with very high affinity and efficacy. More importantly, the data presented here invoke the possibility that LT may bind cells in a receptor-independent fashion, or recognize receptors that do not interact with PA. Hence, blood borne LT may emerge as a novel therapeutic target for combating anthrax. JF - Molecular biology reports AU - Vuyisich, Momchilo AU - Sanders, Claire K AU - Graves, Steven W AD - Los Alamos National Lab, MS M888, P.O. Box 1663, Los Alamos, NM 87545, USA. vuyisich@lanl.gov Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 5897 EP - 5903 VL - 39 IS - 5 KW - Antigens, Bacterial KW - 0 KW - Bacterial Toxins KW - Immobilized Proteins KW - Receptors, Peptide KW - anthrax toxin KW - anthrax toxin receptors KW - Index Medicus KW - Animals KW - Receptors, Peptide -- metabolism KW - Protein Binding -- drug effects KW - Kinetics KW - Humans KW - Mice KW - Protein Structure, Tertiary KW - Immobilized Proteins -- metabolism KW - Models, Biological KW - Cell Line KW - Macrophages -- cytology KW - Antigens, Bacterial -- toxicity KW - Bacterial Toxins -- metabolism KW - Bacterial Toxins -- isolation & purification KW - Antigens, Bacterial -- metabolism KW - Antigens, Bacterial -- isolation & purification KW - Bacterial Toxins -- toxicity KW - Macrophages -- drug effects KW - Macrophages -- metabolism UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/948891754?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Molecular+biology+reports&rft.atitle=Binding+and+cell+intoxication+studies+of+anthrax+lethal+toxin.&rft.au=Vuyisich%2C+Momchilo%3BSanders%2C+Claire+K%3BGraves%2C+Steven+W&rft.aulast=Vuyisich&rft.aufirst=Momchilo&rft.date=2012-05-01&rft.volume=39&rft.issue=5&rft.spage=5897&rft.isbn=&rft.btitle=&rft.title=Molecular+biology+reports&rft.issn=1573-4978&rft_id=info:doi/10.1007%2Fs11033-011-1401-2 LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2012-07-12 N1 - Date created - 2012-03-23 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1007/s11033-011-1401-2 ER - TY - JOUR T1 - NEW H sub(2) COLLISION-INDUCED ABSORPTION AND NH sub(3) OPACITY AND THE SPECTRA OF THE COOLEST BROWN DWARFS AN - 1680446151; PQ0001517842 AB - We present new cloudy and cloudless model atmospheres for brown dwarfs using recent ab initio calculations of the line list of ammonia (NH sub(3)) and of the collision-induced absorption of molecular hydrogen (H sub(2)). We compare the new synthetic spectra with models based on an earlier description of the H sub(2) and NH sub(3) opacities. We find a significant improvement in fitting the nearly complete spectral energy distribution of the T7p dwarf Gliese 570D and in near-infrared color-magnitude diagrams of field brown dwarfs. We apply these new models to the identification of NH sub(3) absorption in the H-band peak of very late T dwarfs and the new Y dwarfs and discuss the observed trend in the NH sub(3)-H spectral index. The new NH sub(3) line list also allows a detailed study of the medium-resolution spectrum of the T9/T10 dwarf UGPS J072227.51-054031.2 where we identify several specific features caused by NH sub(3). JF - Astrophysical Journal AU - Saumon, Didier AU - Marley, Mark S AU - Abel, Martin AU - Frommhold, Lothar AU - Freedman, Richard S AD - Los Alamos National Laboratory, P.O. Box 1663, Mail Stop F663, Los Alamos, NM 87545, USA, dsaumon@lanl.gov Y1 - 2012/05/01/ PY - 2012 DA - 2012 May 01 SP - 1 EP - 11 PB - IOP Publishing, The Public Ledger Building, Suite 929 Philadelphia PA 19106 United States VL - 750 IS - 1 SN - 0004-637X, 0004-637X KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - brown dwarfs KW - opacity KW - stars: atmospheres KW - Atmospheric pollution models KW - Energy KW - Ammonia KW - Absorption KW - Ammonia content of atmosphere KW - Hydrogen KW - Interstellar clouds KW - P 9999:GENERAL POLLUTION KW - M2 52:C. Astrophysics (52) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680446151?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrophysical+Journal&rft.atitle=NEW+H+sub%282%29+COLLISION-INDUCED+ABSORPTION+AND+NH+sub%283%29+OPACITY+AND+THE+SPECTRA+OF+THE+COOLEST+BROWN+DWARFS&rft.au=Saumon%2C+Didier%3BMarley%2C+Mark+S%3BAbel%2C+Martin%3BFrommhold%2C+Lothar%3BFreedman%2C+Richard+S&rft.aulast=Saumon&rft.aufirst=Didier&rft.date=2012-05-01&rft.volume=750&rft.issue=1&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F750%2F1%2F74 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-05-01 N1 - Last updated - 2015-11-16 N1 - SubjectsTermNotLitGenreText - Atmospheric pollution models; Ammonia content of atmosphere; Hydrogen; Interstellar clouds; Ammonia; Energy; Absorption DO - http://dx.doi.org/10.1088/0004-637X/750/1/74 ER - TY - JOUR T1 - Hydrogeochemical analysis of the Roswell groundwater basin, New Mexico AN - 1356357931; 2013-042162 AB - A detailed geochemical analysis was conducted on more than 300 water samples collected from the Pecos River and several aquifer systems within the Roswell Groundwater Basin, New Mexico. These systems include unconfined Quaternary alluvium (Q1 and Q2), Tertiary-Quaternary alluvium (AG2), Permian Artesian Group (PGB1), Permian Melange (M), Permian upper San Andres Formation (USA), and Permian San Andres Formation (SA). Alluvial aquifer material is derived from a mixture of sedimentary and igneous source rocks. The M, PGB1, USA, and US aquifer systems dominantly consist of marine-derived dolomite, calcite, and gypsum with variable amounts of anhydrite. Ionic compositions include calcium-sodium-sulfate (Pecos River), calcium-sodium-chloride-sulfate (PGB1), calcium-sulfate (AG2), and calcium-sulfate-bicarbonate (Q1, Q2, USA, and SA). Groundwater mixing between the Q1, Q2, and AG2 aquifers, AG2 and PGB1 aquifers, and PGB1 and M aquifers at specific locations is suggested by similar chloride and nitrate concentrations. Pervasive groundwater mixing through artificial recharge and from improperly installed wells has taken place for decades within the Roswell Groundwater Basin. Inverse and batch-equilibrium modeling of aquifer material and groundwater using the computer program PHREEQC quantifies geochemical reactions occurring along groundwater flow paths within the Q1, USA, and other aquifer systems. Similar calculations were performed for the Pecos River. Rain, snow, and surface water provide direct recharge to the shallow alluvial Q1 and Q2 aquifers and the USA aquifer exposed west of Roswell. Major ions are calculated to occur mainly as uncomplexed solutes. Varying amounts of sodium, potassium, magnesium, and calcium, however, form complexes with sulfate, bicarbonate, and carbonate ligands. Results of inverse geochemical calculations suggest that dissolution of gypsum, halite, dolomite, calcite, cristobalite (alpha), and/or anhydrite dominantly influences groundwater chemistry within the Q1 and USA aquifer systems and Pecos River. Dissolution of halite from several brine-bearing aquifers occurs east of Roswell, contributing increasing total dissolved solids and salinity along the Pecos River between Acme and Artesia. JF - Abstracts with Programs - Geological Society of America AU - Longmire, Patrick AU - Havenor, Kay C AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 23 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - chlorine KW - water quality KW - PHREEQC KW - Pecos River KW - San Andres Formation KW - Paleozoic KW - halogens KW - artificial recharge KW - New Mexico KW - Permian KW - ground water KW - aquifers KW - models KW - alluvium aquifers KW - chloride ion KW - drainage basins KW - nitrate ion KW - chemical composition KW - unconfined aquifers KW - saline composition KW - Roswell Basin KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356357931?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Hydrogeochemical+analysis+of+the+Roswell+groundwater+basin%2C+New+Mexico&rft.au=Longmire%2C+Patrick%3BHavenor%2C+Kay+C%3BAnonymous&rft.aulast=Longmire&rft.aufirst=Patrick&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=23&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - alluvium aquifers; aquifers; artificial recharge; chemical composition; chloride ion; chlorine; drainage basins; ground water; halogens; models; New Mexico; nitrate ion; Paleozoic; Pecos River; Permian; PHREEQC; Roswell Basin; saline composition; San Andres Formation; unconfined aquifers; United States; water quality ER - TY - JOUR T1 - Mid-upper Miocene sedimentary strata in the western Espanola Basin, New Mexico AN - 1356357829; 2013-042291 AB - The Espanola Basin is a west-tilted half graben filled by the Santa Fe Group. Basin-fill in the western part of the basin, west of the Rio Grande, are largely obscured by Plio-Pleistocene Bandelier Tuff and Cerros del Rio volcanic rocks. However, numerous groundwater monitoring and municipal water-supply wells provide important information about late Miocene sedimentation and tectonics in this area. Two depositional environments were present during the late Miocene: west-sloping alluvial fans and a south-sloping basin-floor. East-flowing streams from the Jemez volcanic field deposited intermediate to felsic volcanic gravel and sand on the alluvial fans (>600 m thick). The upper part of these deposits provides a correlatable marker interval in the subsurface and contains crystal-poor rhyolite ash, pumice, and lava detritus. Glass compositions and (super 40) Ar/ (super 39) Ar results indicate these deposits represent reworked Bearhead Rhyolite tephra ( approximately 6.8-7 Ma). The alluvial fan deposits interfinger laterally eastward with basin-floor riverine deposits of the Chamita Formation. The Chamita Formation ( approximately 6-13 Ma) is primarily comprised of sands and gravels deposited by two merging, south-flowing rivers: the ancestral Rio Chama (Hernandez Member) and ancestral Rio Grande (Vallito Member). Basalts and phreatomagmatic deposits intercalated within the Chamita Formation cluster between 11.5-13.2 Ma and 8.8-9.3 Ma, indicating sedimentation and mafic volcanism were coincident. Earlier investigations miscorrelated parts of the late Miocene deposits with the Pliocene Puye Formation and Totavi Lentil, respectively. But a major unconformity separates the late Miocene alluvial slope and basin floor deposits from the overlying Pliocene Puye Formation. Chemical and (super 40) Ar/ (super 39) Ar results confirm petrographic observations that the lowermost Puye deposits contain abundant Rendija Canyon Rhyodacite detritus and have a maximum age of about 5 Ma. Miocene Santa Fe Group outcrops in the vicinity of the Rio Grande dip gently westward, consistent with dip directions in most of the half graben. However, late Miocene beds to the west, beneath the Pajarito Plateau, dip to SSW. We interpret the south dips as indicative of increasing southward displacement along the east-down Pajarito fault, which serves as the master fault in this area. JF - Abstracts with Programs - Geological Society of America AU - Broxton, David E AU - WoldeGabriel, Giday AU - Vaniman, David AU - Koning, Daniel J AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 78 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - stratigraphy KW - Quaternary KW - sedimentary basins KW - sedimentation KW - Pajarito Plateau KW - correlation KW - New Mexico KW - Puye Formation KW - displacements KW - Miocene KW - Cenozoic KW - Tertiary KW - Santa Fe Group KW - paleoenvironment KW - Bandelier Tuff KW - Neogene KW - alluvial fans KW - basins KW - Pleistocene KW - Chamita Formation KW - faults KW - Espanola Basin KW - 12:Stratigraphy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356357829?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Mid-upper+Miocene+sedimentary+strata+in+the+western+Espanola+Basin%2C+New+Mexico&rft.au=Broxton%2C+David+E%3BWoldeGabriel%2C+Giday%3BVaniman%2C+David%3BKoning%2C+Daniel+J%3BAnonymous&rft.aulast=Broxton&rft.aufirst=David&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=78&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - alluvial fans; Bandelier Tuff; basins; Cenozoic; Chamita Formation; correlation; displacements; Espanola Basin; faults; Miocene; Neogene; New Mexico; Pajarito Plateau; paleoenvironment; Pleistocene; Puye Formation; Quaternary; Santa Fe Group; sedimentary basins; sedimentation; stratigraphy; Tertiary; United States ER - TY - JOUR T1 - Geochemical processes controlling transport and deposition of uranium, Espanola Basin, New Mexico AN - 1356357758; 2013-042282 AB - Uranium is a trace metal of considerable interest within aquifer systems worldwide. Concentrations of natural uranium vary from less than 8.40e-09 M (0.002 mg/L) to 7.65e-06 M (1.82 mg/L) in groundwater within the Espanola Basin, New Mexico. Uranium concentrations exceeding the EPA drinking water standard of 0.030 mg/L are of public health concern. Oxidative dissolution of uranium(IV) minerals, associated with Proterozoic granitic rocks in the Sangre de Cristo Mountains, and hydrolysis of uranium-bearing volcanic ash and granitic and volcanic detritus within the Tesuque Formation, contribute to highly variable uranium concentrations measured in groundwater. Sub-economical grade uranium is associated with clay galls, opal, chert, fossil bone, carbonaceous material, and ferric (oxy)hydroxide within the San Jose mining district (Arroyo Seco and Oxide Butte). Uranium(VI) minerals identified include carnotite (K (sub 2) (UO (sub 2) ) (sub 2) V (sub 2) O (sub 8) . 3H (sub 2) O), meta-autunite (Ca(UO (sub 2) ) (sub 2) (PO (sub 4) ) (sub 2) . 2-6H (sub 2) O), and schroeckingerite NaCa (sub 3) (UO (sub 2) )(CO (sub 3) ) (sub 3) (SO (sub 4) )F . 10H (sub 2) O). Millimolar concentrations of dissolved uranium are required to precipitate meta-autunite, implying that this phase formed in the unsaturated zone. Groundwater, however, approaches equilibrium with respect to carnotite and haiweeite (Ca(UO (sub 2) ) (sub 2) (Si (sub 2) O (sub 5) ) (sub 3) . 5H (sub 2) O). Haiweeite is a potential hydrolysis product associated with dissolution of soluble uranium-bearing volcanic ash. Higher concentrations of uranium in groundwater typically are associated with increasing concentrations of sodium and decreasing concentrations of calcium. PHREEQC simulations suggest that adsorption of Ca (super 2+) onto ferric (oxy)hydroxide releases Na (super +) and UO (sub 2) (super 2+) to groundwater. Results of deionized (DI) water leach tests and EPA 3050 partial digestions (pH1) performed on oxidized sediments collected from the San Jose mining district show that concentrations of leached and digested uranium range from 3.21 to 52.21 mg/kg and from 8.48 to 107.8 mg/kg, respectively. Distribution coefficients for the Arroyo Seco and Oxide Butte samples range from 59.4 to 79.11 L/kg and from 24.9 to 35.1 L/kg, respectively, using a 1.5:1 DI water-solid ratio. Ferric (oxy)hydroxide, solid organic matter, and smectite are the dominant adsorbents for uranium(VI) within the study area. JF - Abstracts with Programs - Geological Society of America AU - Longmire, Patrick AU - Vaniman, David AU - Rearick, Michael AU - McLemore, Virginia T AU - Wiman, Stephen AU - McQuillan, Dennis AU - Simmons, Ardyth M AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 76 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - aquifer vulnerability KW - water quality KW - Sangre de Cristo Mountains KW - unsaturated zone KW - hydrolysis KW - New Mexico KW - drinking water KW - ground water KW - transport KW - depositional environment KW - Espanola Basin KW - North America KW - concentration KW - U. S. Rocky Mountains KW - adsorption KW - solubility KW - aquifers KW - metals KW - uranium KW - trace metals KW - actinides KW - Rocky Mountains KW - public health KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356357758?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Geochemical+processes+controlling+transport+and+deposition+of+uranium%2C+Espanola+Basin%2C+New+Mexico&rft.au=Longmire%2C+Patrick%3BVaniman%2C+David%3BRearick%2C+Michael%3BMcLemore%2C+Virginia+T%3BWiman%2C+Stephen%3BMcQuillan%2C+Dennis%3BSimmons%2C+Ardyth+M%3BAnonymous&rft.aulast=Longmire&rft.aufirst=Patrick&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=76&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - actinides; adsorption; aquifer vulnerability; aquifers; concentration; depositional environment; drinking water; Espanola Basin; ground water; hydrolysis; metals; New Mexico; North America; public health; Rocky Mountains; Sangre de Cristo Mountains; solubility; trace metals; transport; U. S. Rocky Mountains; United States; unsaturated zone; uranium; water quality ER - TY - JOUR T1 - Public health concerns of uranium in groundwater in New Mexico AN - 1356357747; 2013-042281 AB - Natural uranium has been detected at concentrations exceeding the EPA drinking-water standard of 0.03 mg/L in many public and private water supply wells in the Espanola Basin, the Grants-Gallup mineral belt, Las Cruces, Tucumcari, and in other communities in New Mexico. Excessive detections are often associated with Proterozoic granitic rocks, the Jurassic Morrison Formation, Cenozoic volcanic ash, or with sediments derived from these rocks. Uranyl carbonate complexes [UO (sub 2) (CO (sub 3) ) (super 0) , UO (sub 2) (CO (sub 3) ) (sub 2) (super 2-) , and UO (sub 2) (CO (sub 3) ) (sub 3) (super 4-) ] are the most common uranium species in natural water. Most uranium ingested in drinking water is excreted in urine within several days, but some uranium is stored in the body, primarily in the bones, liver and kidneys. The primary health concern of ingested uranium is chemical kidney toxicity. The EPA drinking-water standard is intended to address both nephrotoxicity and radiation hazards of alpha particles emitted by uranium isotopes. Urine testing can determine if a person has recently been exposed to high levels of uranium via ingestion or inhalation. Detection of greater than 0.08 mu g/L of uranium in urine is a "notifiable condition" that must be reported to the New Mexico Department of Health. Concentrations of uranium in drinking water can be decreased by blending, and by anion exchange or membrane filtration treatment technology. Public water utilities often use blending due to the high cost of water treatment. Many private domestic well owners have installed household treatment systems. Since the health risk of uranium in well water is from ingestion, point-of-use (kitchen sink) treatment systems are suitable in household situations. Membrane filtration with effective pore size of 0.001 mu m decreases uranium concentrations while minimizing water consumed by the treatment process, relative to reverse osmosis with effective pore size of 0.0001 mu m. Management of uranium-bearing drinking-water treatment waste, which is often discharged to an onsite wastewater system, is an emerging issue. JF - Abstracts with Programs - Geological Society of America AU - McQuillan, Dennis AU - Toth, Barbara AU - Wiman, Stephen AU - Longmire, Patrick AU - Vaniman, David AU - Rearick, Michael AU - McLemore, Virginia T AU - Simmons, Ardyth M AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 76 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - aquifer vulnerability KW - concentration KW - toxic materials KW - waste water KW - uranyl ion KW - pollution KW - New Mexico KW - drinking water KW - ground water KW - bioaccumulation KW - aquifers KW - toxicity KW - metals KW - water treatment KW - policy KW - uranium KW - discharge KW - actinides KW - public health KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356357747?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Public+health+concerns+of+uranium+in+groundwater+in+New+Mexico&rft.au=McQuillan%2C+Dennis%3BToth%2C+Barbara%3BWiman%2C+Stephen%3BLongmire%2C+Patrick%3BVaniman%2C+David%3BRearick%2C+Michael%3BMcLemore%2C+Virginia+T%3BSimmons%2C+Ardyth+M%3BAnonymous&rft.aulast=McQuillan&rft.aufirst=Dennis&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=76&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - actinides; aquifer vulnerability; aquifers; bioaccumulation; concentration; discharge; drinking water; ground water; metals; New Mexico; policy; pollution; public health; toxic materials; toxicity; United States; uranium; uranyl ion; waste water; water treatment ER - TY - JOUR T1 - U-series dating and stable isotope analysis of travertine deposits near Ponderosa, NM; implications for defining the eastern limit of the Valles outflow plume AN - 1356357633; 2013-042125 AB - The well-known Valles Caldera hydrothermal outflow plume, which flows along the Jemez fault zone (JFZ) in Canon de San Diego (CdSD) in the SW Jemez Mountains, New Mexico, possibly extends to the east of the currently accepted limits. Recent geologic mapping on the Cat Mesa and Jose fault zones (CMFZ and JoFZ), 3-6 km east of the JFZ, has identified several Quaternary hydrothermal features. Also, a hot well with temperatures of 129 degrees C at 829 m depth (AET-4) located just east of the CMFZ implies an eastward extension of the plume. Indications of Quaternary hydrothermal activity include four generations of travertine deposition, goethite/hematite/barite mineralization in fault zones and coating terrace gravels, and one sinter deposit on the JoFZ. The highest elevation and oldest travertine in the area rests on a terrace 190 m above the Jemez River. Stable isotope values for this travertine are delta (super 13) C of 5.18ppm; PDB and delta (super 18) O of 23.74ppm; SMOW. The other travertine mounds lie on much lower terraces of around 40 m above the Jemez River and have an estimated age of around 155 ka. The sinter deposit intrudes into the JoFZ contact between Jurassic Entrada Sandstone and Tertiary Zia Formation and is indicative of very high temperature water. The deposit is of an unknown age and appears to be an exhumed vent. Recent detailed geologic mapping along the JFZ on the Pueblo of Jemez has identified three generations of travertine deposition. The oldest is at an elevation of 44 m above the river and has an age of 233 ka. This travertine deposit rests on fine illite clay that was deposited across the JFZ. After the first travertine deposition, hematite-rich fluids cemented alluvial fan deposits, which were then overlain by a 144 ka travertine deposit. The third travertine occurs near Salt Spring at an elevation of 9 m above the river and has an age of 166 ka. Stable isotope data from these travertines ranges from delta (super 13) C values of 3.47ppm - 3.73ppm PDB and delta (super 18) O values of 22.40ppm - 22.52ppm SMOW. These data are fairly consistent with published U-series dates and stable isotope values from Soda Dam. The travertines on Jemez Pueblo are thought to have the same outflow plume origin as Soda Dam. U-series dates and stable isotope data will be evaluated to determine if the outflow plume is responsible for deposition of the CMFZ and JoFZ travertines. JF - Abstracts with Programs - Geological Society of America AU - Salaz, Robert E AU - Kelley, Shari A AU - WoldeGabriel, Giday AU - Albrecht, Michael AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 16 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - Zia Formation KW - oxygen KW - Jose fault zone KW - isotopes KW - Cat Mesa fault zone KW - Sandoval County New Mexico KW - mapping KW - New Mexico KW - stable isotopes KW - Cenozoic KW - sedimentary rocks KW - dates KW - carbon KW - Valles Caldera KW - Jemez Mountains KW - Ponderosa New Mexico KW - Upper Jurassic KW - Jurassic KW - isotope ratios KW - C-13/C-12 KW - O-18/O-16 KW - Mesozoic KW - hydrothermal conditions KW - Tertiary KW - Entrada Sandstone KW - travertine KW - carbonate rocks KW - 06A:Sedimentary petrology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356357633?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=U-series+dating+and+stable+isotope+analysis+of+travertine+deposits+near+Ponderosa%2C+NM%3B+implications+for+defining+the+eastern+limit+of+the+Valles+outflow+plume&rft.au=Salaz%2C+Robert+E%3BKelley%2C+Shari+A%3BWoldeGabriel%2C+Giday%3BAlbrecht%2C+Michael%3BAnonymous&rft.aulast=Salaz&rft.aufirst=Robert&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=16&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - C-13/C-12; carbon; carbonate rocks; Cat Mesa fault zone; Cenozoic; dates; Entrada Sandstone; hydrothermal conditions; isotope ratios; isotopes; Jemez Mountains; Jose fault zone; Jurassic; mapping; Mesozoic; New Mexico; O-18/O-16; oxygen; Ponderosa New Mexico; Sandoval County New Mexico; sedimentary rocks; stable isotopes; Tertiary; travertine; United States; Upper Jurassic; Valles Caldera; Zia Formation ER - TY - JOUR T1 - Hydrochemistry of the Valle Toledo, Valles Caldera, New Mexico AN - 1356357526; 2013-042131 AB - Initial groundwater resource investigations were conducted in the Valle Toledo and other areas near Los Alamos, New Mexico during the late 1940's and early 1950's. The investigations included drilling of numerous test holes and installation of several observation and pumping wells. Test holes within the Valle Toledo penetrated an artesian sand and gravel aquifer 122 m thick. Results of the water resource investigations determined that pumping and development of the aquifer would deplete flow to the San Antonio River and potentially obstruct surface-water rights; hence, groundwater resources in the Valle Toledo were not developed. This investigation was conducted to evaluate hydrochemical characteristics and groundwater residence times. Groundwater samples were collected and analyzed for major ions, trace elements, low-level tritium, radiocarbon in dissolved inorganic carbon (DIC), and stable isotopes of hydrogen, oxygen, and carbon in DIC. Groundwater is characterized by a sodium-calcium-bicarbonate composition with total dissolved solids (TDS) ranging from 100 to 130 mg/L. Concentrations of nitrate as nitrogen range from 0.02 to 0.04 mM (0.3 to 0.5 mg/L) and sulfate range from 0.01 to 0.03 mM (1.4 to 2.8 mg/L). Water-rock interactions are not extensive based on the TDS content and chemical composition of the groundwater samples. Compositions of delta (super 2) H and delta (super 18) O range from -92.6 to -88.1 ppm and from -12.9 to -12.2 ppm, respectively, suggesting that snowmelt and rain provide local recharge to the aquifer system. Activities of tritium were less than detection (0.2 tritium units, 0.6 pCi/L), with no modern component of water present. This suggests that recharge to the artesian aquifer is greater than 60 years. Unadjusted radiocarbon activities as fraction modern carbon in dissolved inorganic carbon range from 0.82 to 0.74, corresponding to estimated ages ranging from 1,521 to 2,400 years. The San Antonio River is the principal drainage from the Valle Toledo and is designated as a High Quality Coldwater Aquatic Life water source. Discharge of groundwater from the Valle Toledo supports headwater baseflow to the San Antonio River. Groundwater discharging to the San Antonio River is not susceptible to present-day contamination, as reflected by the average age exceeding 1,500 years. JF - Abstracts with Programs - Geological Society of America AU - Dale, Michael AU - Granzow, Kim AU - Longmire, Patrick AU - Englert, David AU - Rearick, Michael AU - Perkins, George AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 17 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - water quality KW - San Antonio River KW - oxygen KW - isotopes KW - observation wells KW - New Mexico KW - Los Alamos County New Mexico KW - stable isotopes KW - ground water KW - pump tests KW - artesian waters KW - Valles Caldera KW - discharge KW - chemical composition KW - Valle Toledo KW - isotope ratios KW - solutes KW - pollution KW - O-18/O-16 KW - aquifers KW - boreholes KW - D/H KW - hydrogen KW - residence time KW - water resources KW - meltwater KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356357526?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Hydrochemistry+of+the+Valle+Toledo%2C+Valles+Caldera%2C+New+Mexico&rft.au=Dale%2C+Michael%3BGranzow%2C+Kim%3BLongmire%2C+Patrick%3BEnglert%2C+David%3BRearick%2C+Michael%3BPerkins%2C+George%3BAnonymous&rft.aulast=Dale&rft.aufirst=Michael&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=17&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - aquifers; artesian waters; boreholes; chemical composition; D/H; discharge; ground water; hydrogen; isotope ratios; isotopes; Los Alamos County New Mexico; meltwater; New Mexico; O-18/O-16; observation wells; oxygen; pollution; pump tests; residence time; San Antonio River; solutes; stable isotopes; United States; Valle Toledo; Valles Caldera; water quality; water resources ER - TY - JOUR T1 - Geologic map of the Valles Caldera, Jemez Mountains, New Mexico AN - 1356357355; 2013-042102 AB - Valles caldera (1.25 Ma) is famous as the type locality of large resurgent calderas, the location of a classic 260-300 degrees C liquid-dominated geothermal system, and the site of a long-lived late Pleistocene lake (South Mountain lake, ca. 550 to 370 ka). We have published a detailed color geologic map of the Valles caldera and surrounding areas at 1:50,000 scale obtainable from New Mexico Bureau of Geology and Mineral Resources (geoinfo.nmt.edu/publications/maps/geologic/gm/79/). The new Valles map has been compiled from all or parts of nine 1:24,000 geologic maps completed between 2004 and 2008 (Bland, Cerro del Grant, Jarosa, Jemez Springs, Polvadera Peak, Redondo Peak, Seven Springs, Valle San Antonio, and Valle Toledo). Our map provides more detailed geology on the resurgent dome, caldera collapse breccias, post-caldera lava and tuff eruptions, intracaldera sedimentary and lacustrine deposits, and precaldera volcanic and sedimentary rocks than previous maps. We also show structural relations between Valles and the earlier, comparably sized Toledo Caldera (1.62 Ma). Furthermore, the map documents the distribution of pre- and post-caldera hydrothermal alteration styles, including recently recognized zeolite-type alteration. Three cross sections supported by surface geology, geophysical data and deep borehole logs (< or =4500 m) show an updated view of the caldera interior, depict a modern interpretation of caldera collapse and resurgence, and provide caldera-wide subsurface isotherms (< or =300 degrees C). The map incorporates recent stratigraphic revisions to the geology of the Jemez Mountains volcanic field (JMVF). East (9-10 Ma) to west (7-9 Ma) to east (2-5 Ma) migration of the volcanic centers in the northern JMVF is preserved along the northeast caldera margin. In addition, (super 40) Ar/ (super 39) Ar dates from the northeast side of the caldera reveal three episodes of rhyolite emplacement at ca. 7.1, 4.8, and 1.6 Ma. Finally, we present a generalized model showing our interpretation of intracaldera structure and subjacent magma chambers, and relations of Valles to earlier Quaternary-Precambrian units. JF - Abstracts with Programs - Geological Society of America AU - Goff, Fraser AU - Gardner, Jamie N AU - Reneau, SL AU - Kelley, Shari A AU - Kempter, Kirt A AU - Lawrence, John R AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 12 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - rhyolites KW - breccia KW - volcanic rocks KW - igneous rocks KW - mapping KW - New Mexico KW - metasomatism KW - calderas KW - pyroclastics KW - volcanic features KW - geothermal systems KW - South Mountain Lake KW - magmas KW - eruptions KW - Valles Caldera KW - lacustrine environment KW - Jemez Mountains KW - hydrothermal alteration KW - tuff KW - depositional environment KW - interpretation KW - magma chambers KW - 14:Geologic maps UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356357355?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Geologic+map+of+the+Valles+Caldera%2C+Jemez+Mountains%2C+New+Mexico&rft.au=Goff%2C+Fraser%3BGardner%2C+Jamie+N%3BReneau%2C+SL%3BKelley%2C+Shari+A%3BKempter%2C+Kirt+A%3BLawrence%2C+John+R%3BAnonymous&rft.aulast=Goff&rft.aufirst=Fraser&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=12&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - breccia; calderas; depositional environment; eruptions; geothermal systems; hydrothermal alteration; igneous rocks; interpretation; Jemez Mountains; lacustrine environment; magma chambers; magmas; mapping; metasomatism; New Mexico; pyroclastics; rhyolites; South Mountain Lake; tuff; United States; Valles Caldera; volcanic features; volcanic rocks ER - TY - JOUR T1 - The Rock Springs Uplift, Wyoming; an outstanding geological CO (sub 2) storage site AN - 1356356893; 2013-042219 AB - According to the 2010 U.S. EPA Greenhouse Gas Reporting Program, stationary sources in southwestern Wyoming annually emit 29+ Mt of CO (sub 2) , or approximately 50 percent of the state's CO (sub 2) emissions. These industrial CO (sub 2) emissions come from coal-fired power plants, gas and trona processing plants, pipeline compression stations, chemical production facilities, and gas field complexes. It is essential that Wyoming proactively pursue carbon capture and storage (CCS) technology to prepare for potential regulatory, political, and economic paradigm shifts that could diminish industrial activities in the Greater Green River basin, consequently damaging the state's economy. Previous work using a generalized regional database suggested that the Rock Springs Uplift in the center of the Greater Green River basin had the attributes to become a commercial-scale CO (sub 2) storage site. To reduce uncertainty and refine previous numerical simulations (performance assessments) of the uplift, data from a 3-D seismic survey over the area of interest (5 miles X 5 miles), a stratigraphic test well (12,800+ feet deep), 916 feet of high-quality core, a specialized log suite, a VSP survey, fluid samples, and laboratory analyses have been used. This new database has resulted in a more accurate evaluation of the spatial heterogeneity of reservoir/seal petrophysical properties. The integration of seismic attributes with observations from log suites, core, continuous permeability scans, fluid samples, and laboratory analyses produced distribution volumes of porosity, permeability, lithofacies, and fractures in the Madison Limestone and Weber Sandstone. Input of these volumes into the numerical simulations has resulted in improved performance assessments of the CO (sub 2) storage capacity of the reservoir interval. In previous simulations, the spatial distribution of the injected CO (sub 2) plume is cylindrical with few marginal irregularities, whereas in the new simulations, the CO (sub 2) plume occupies a larger volume and displays pronounced marginal irregularities. The new data and performance evaluations demonstrate that the Rock Springs Uplift in the Greater Green River basin remains an outstanding large-scale geological CO (sub 2) storage site, and provides the information necessary to design commercial injection/storage facilities on the uplift. JF - Abstracts with Programs - Geological Society of America AU - Surdam, Ronald AU - Jiao, Zunsheng AU - Ganshin, Yuri AU - Bentley, Ramsey AU - Quillinan, Scott AU - McLaughlin, J Fred AU - Garcia-Gonzalez, Mario AU - Stauffer, Philip H AU - Deng, Hailin AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 34 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - carbon sequestration KW - numerical models KW - three-dimensional models KW - Rock Springs Uplift KW - Green River basin KW - injection KW - geophysical methods KW - power plants KW - storage coefficient KW - combustion KW - Madison Group KW - seismic methods KW - carbon dioxide KW - environmental management KW - Wyoming KW - sedimentary rocks KW - coal KW - industrial waste KW - reservoir properties KW - ecology KW - greenhouse gases KW - waste disposal KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356356893?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=The+Rock+Springs+Uplift%2C+Wyoming%3B+an+outstanding+geological+CO+%28sub+2%29+storage+site&rft.au=Surdam%2C+Ronald%3BJiao%2C+Zunsheng%3BGanshin%2C+Yuri%3BBentley%2C+Ramsey%3BQuillinan%2C+Scott%3BMcLaughlin%2C+J+Fred%3BGarcia-Gonzalez%2C+Mario%3BStauffer%2C+Philip+H%3BDeng%2C+Hailin%3BAnonymous&rft.aulast=Surdam&rft.aufirst=Ronald&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=34&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - carbon dioxide; carbon sequestration; coal; combustion; ecology; environmental management; geophysical methods; Green River basin; greenhouse gases; industrial waste; injection; Madison Group; numerical models; power plants; reservoir properties; Rock Springs Uplift; sedimentary rocks; seismic methods; storage coefficient; three-dimensional models; United States; waste disposal; Wyoming ER - TY - JOUR T1 - Sulfate loads of geologic and anthropogenic origin in the Rio Grande Valley; sulfur isotope mass balance AN - 1356356827; 2013-042066 AB - The Rio Grande is the fourth longest river system in United States and is the primary source of irrigation water for the Rio Grande Valley. Evaporation, groundwater recharge associated with salt-rich sedimentary rocks, geothermal heating, and flood irrigation are believed to increase the solute content of the river. To assess the salt loads from various geologic and anthropogenic sources in the Rio Grande Valley, we have been working to determine the chemistry and S isotope composition (delta (super 34) S of sulfate) for a 1,400 km long stretch of the Rio Grande, its shallow aquifers and drains in New Mexico and West Texas. The delta (super 34) S of sulfate greatly differs for pyrite-, evaporite- and fertilizer-derived sulfate (-25 to 0 ppm, +9 to +17 ppm, and -2 to +4 ppm, respectively). Therefore, the contribution and fluxes of sulfate can be estimated using S isotope mass balance constraints. Our initial results suggest that sulfate fluxes in the recharge areas of the Rio Grande are mainly controlled by sulfide weathering in upstream locations ( approximately 50 to 100 %), which appear to be the highest during snow melt events, and dissolution of Paleozoic and Mesozoic evaporites (< 50 %). With downstream flow, the Rio Grande likely gets additional sulfate fluxes from return irrigation flows, controlled by fertilizers ( approximately 20 %) and inputs from sedimentary sources ( approximately 20 %). JF - Abstracts with Programs - Geological Society of America AU - Szynkiewicz, Anna AU - Borrok, David M AU - Rearick, Michael AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 5 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - water quality KW - fertilizers KW - isotopes KW - New Mexico KW - stable isotopes KW - ground water KW - sedimentary rocks KW - mass balance KW - drainage basins KW - Rio Grande Valley KW - chemically precipitated rocks KW - isotope ratios KW - West Texas KW - solutes KW - Texas KW - evaporites KW - weathering KW - aquifers KW - geothermal energy KW - geothermal fields KW - recharge KW - evaporation KW - S-34/S-32 KW - sulfur KW - shallow aquifers KW - sulfides KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356356827?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Sulfate+loads+of+geologic+and+anthropogenic+origin+in+the+Rio+Grande+Valley%3B+sulfur+isotope+mass+balance&rft.au=Szynkiewicz%2C+Anna%3BBorrok%2C+David+M%3BRearick%2C+Michael%3BAnonymous&rft.aulast=Szynkiewicz&rft.aufirst=Anna&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=5&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - aquifers; chemically precipitated rocks; drainage basins; evaporation; evaporites; fertilizers; geothermal energy; geothermal fields; ground water; isotope ratios; isotopes; mass balance; New Mexico; recharge; Rio Grande Valley; S-34/S-32; sedimentary rocks; shallow aquifers; solutes; stable isotopes; sulfides; sulfur; Texas; United States; water quality; weathering; West Texas ER - TY - JOUR T1 - Structural basins and accommodation zones in the central Rio Grande Rift, New Mexico; new results from geophysics AN - 1356356548; 2013-042186 AB - The active late Cenozoic Rio Grande Rift of the southwestern U.S. comprises several right-stepping, faulted basins separated by accommodation zones of different types. For several years the SAGE (Summer of Applied Geophysical Experience) Program has conducted a variety of geophysical surveys along the eastern margin of the rift, 10-35 km southwest of Santa Fe, New Mexico. The purpose has been to investigate structures and history of a complex NE-trending accommodation zone (Santo Domingo) separating the larger Espanola (to north) and Albuquerque rift basins. Crustal extension is transferred dominantly along north- to northwest-trending en echelon faults, creating sub-basins and plunging ramps oblique to the accommodation zone. SAGE has produced seismic reflection images of two of these faults ("ramp faults"), the La Bajada (LB) and San Francisco (SF) Faults, allowing determination of their dips (near 60 degrees down to west). Offset on the basin-bounding LB fault increases from near zero at the south to a maximum of approximately 3000 m 13 km to the north, where the uplifted footwall comprises the flanking Cerrillos Uplift. Initiation of the LB fault is not constrained but vertical offset is only approximately 200 m since 2.7 Ma. Uplift of the Sandia Mountains approximately 20 Ma ago warped the hanging wall into a closed northward plunging structural basin. Preliminary gravity data for the intra-rift SF fault are compatible with approximately 1.3 km of down-to-the west offset. Combining our new seismic, gravity, and other geophysical data, and integrating with industry seismic reflection, geological, and borehole data allows us to estimate extension and block rotation along these faults. We are able to discriminate pre-rift (Laramide) from post-middle Miocene (rift) structures, and begin to quantify vertical offset across faults and geometry of basin fill. Our overall goal is to infer kinematic development, linkages among faults, growth history, and possible pre-rift structural controls. JF - Abstracts with Programs - Geological Society of America AU - Baldridge, W Scott AU - Ferguson, John F AU - Braile, Lawrence W AU - Snelson, Catherine M AU - Biehler, Shawn AU - Bailey, Bevin L AU - Buening, Jonathan AU - Christianson, Ryan AU - Judy, Brett AU - Pazos, Celia S AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 27 EP - 28 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 6 SN - 0016-7592, 0016-7592 KW - United States KW - North America KW - rift zones KW - sedimentary basins KW - geophysical methods KW - New Mexico KW - extension tectonics KW - Miocene KW - geometry KW - Rio Grande Rift KW - Cenozoic KW - kinematics KW - Tertiary KW - Santa Fe New Mexico KW - Neogene KW - basins KW - Santa Fe County New Mexico KW - tectonics KW - Sandia Mountains KW - faults KW - crust KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356356548?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Structural+basins+and+accommodation+zones+in+the+central+Rio+Grande+Rift%2C+New+Mexico%3B+new+results+from+geophysics&rft.au=Baldridge%2C+W+Scott%3BFerguson%2C+John+F%3BBraile%2C+Lawrence+W%3BSnelson%2C+Catherine+M%3BBiehler%2C+Shawn%3BBailey%2C+Bevin+L%3BBuening%2C+Jonathan%3BChristianson%2C+Ryan%3BJudy%2C+Brett%3BPazos%2C+Celia+S%3BAnonymous&rft.aulast=Baldridge&rft.aufirst=W&rft.date=2012-05-01&rft.volume=44&rft.issue=6&rft.spage=27&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, Rocky Mountain Section, 64th annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-05-30 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - basins; Cenozoic; crust; extension tectonics; faults; geometry; geophysical methods; kinematics; Miocene; Neogene; New Mexico; North America; rift zones; Rio Grande Rift; Sandia Mountains; Santa Fe County New Mexico; Santa Fe New Mexico; sedimentary basins; tectonics; Tertiary; United States ER - TY - JOUR T1 - Incorporating field wind data into FIRETEC simulations of the International Crown Fire Modeling Experiment (ICFME): preliminary lessons learned AN - 1328508289; 16924232 AB - Field experiments are one way to develop or validate wildland fire-behavior models. It is important to consider the implications of assumptions relating to the locality of measurements with respect to the fire, the temporal frequency of the measured data, and the changes to local winds that might be caused by the experimental configuration. Twenty FIRETEC simulations of International Crown Fire Modeling Experiment (ICFME) plot 1 and plot 6 fires were performed using horizontally homogenized fuels. These simulations enable exploration of the sensitivity of model results to specific aspects of the interpretation and use of the locally measured wind data from this experiment. By shifting ignition times with respect to dynamic measured tower wind data by up to 2 min, FIRETEC simulations are used to examine possible ramifications of treating the measured tower winds as if they were precisely the same as those present at the location of the fire, as well as possible implications of temporal averaging of winds or undersampling. Model results suggest that careful consideration should be paid to the relative time scales of the wind fluctuations, duration of the fires, and data collection rates when using experimentally derived winds as inputs for fire models.Original Abstract: L'experimentation sur le terrain est une facon de developper ou de valider les modeles de comportement des feux de foret. Il est important de tenir compte des repercussions des hypotheses reliees a l'endroit ou les mesures sont prises au sujet du feu, a la frequence temporelle des donnees qui sont mesurees et aux perturbations des vents locaux qui pourraient etre dues au dispositif experimental. Vingt simulations FIRETEC des feux dans les parcelles 1 et 6 de l'Experience internationale de modelisation des feux de cimes (EIMFC) ont ete realisees en utilisant des combustibles horizontalement homogenes. Ces simulations ont permis d'explorer la sensibilite des resultats du modele a des aspects specifiques de l'interpretation et de l'utilisation des donnees de vent mesurees localement dans cette experience. En decalant jusqu'a deux minutes les temps d'allumage en ce qui a trait aux donnees de vent mesurees de facon dynamique dans une tour, les simulations FIRETEC sont utilisees pour etudier les ramifications potentielles reliees au fait de traiter les vents mesures dans une tour comme s'ils etaient exactement les memes que ceux qui sont presents a l'endroit ou survient le feu, ainsi que les implications potentielles de faire la moyenne des vents dans le temps ou de sous-echantillonner. Les resultats du modele indiquent qu'on devrait accorder une attention particuliere aux echelles relatives de temps des fluctuations du vent, a la duree des feux et aux taux de collecte des donnees lorsqu'on utilise des vents experimentalement derives comme intrant pour la modelisation des feux. JF - Canadian Journal of Forest Research/Revue Canadienne de Recherche Forestiere AU - Linn, Rodman AU - Anderson, Kerry AU - Winterkamp, Judith AU - Brooks, Alyssa AU - Wotton, Michael AU - Dupuy, Jean-Luc AU - Pimont, Francois AU - Edminster, Carleton AD - Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA., rrl@lanl.gov Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 879 EP - 898 PB - NRC Research Press VL - 42 IS - 5 SN - 0045-5067, 0045-5067 KW - Environment Abstracts; Ecology Abstracts KW - Sensitivity KW - Fires KW - Data collection KW - Data processing KW - Fuels KW - Simulation KW - Forests KW - Data collections KW - Models KW - Wildfire KW - Wind KW - ENA 08:International KW - D 04060:Management and Conservation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328508289?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Canadian+Journal+of+Forest+Research%2FRevue+Canadienne+de+Recherche+Forestiere&rft.atitle=Incorporating+field+wind+data+into+FIRETEC+simulations+of+the+International+Crown+Fire+Modeling+Experiment+%28ICFME%29%3A+preliminary+lessons+learned&rft.au=Linn%2C+Rodman%3BAnderson%2C+Kerry%3BWinterkamp%2C+Judith%3BBrooks%2C+Alyssa%3BWotton%2C+Michael%3BDupuy%2C+Jean-Luc%3BPimont%2C+Francois%3BEdminster%2C+Carleton&rft.aulast=Linn&rft.aufirst=Rodman&rft.date=2012-05-01&rft.volume=42&rft.issue=5&rft.spage=879&rft.isbn=&rft.btitle=&rft.title=Canadian+Journal+of+Forest+Research%2FRevue+Canadienne+de+Recherche+Forestiere&rft.issn=00455067&rft_id=info:doi/10.1139%2Fx2012-038 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-04-01 N1 - Number of references - 24 N1 - Last updated - 2015-05-27 N1 - SubjectsTermNotLitGenreText - Fires; Data processing; Fuels; Data collections; Wind; Models; Sensitivity; Data collection; Wildfire; Forests; Simulation DO - http://dx.doi.org/10.1139/x2012-038 ER - TY - JOUR T1 - U-series dating and stable isotope analysis of travertine deposits near Ponderosa, New Mexico; implications for defining the eastern limit of the Valles outflow plume AN - 1220563978; 2013-002026 JF - New Mexico Geology AU - Salaz, R E AU - Kelley, S A AU - WoldeGabriel, G AU - Albrecht, M AU - Anonymous Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 57 EP - 58 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM VL - 34 IS - 2 SN - 0196-948X, 0196-948X KW - United States KW - Quaternary KW - oxygen KW - isotopes KW - isotope ratios KW - C-13/C-12 KW - O-18/O-16 KW - New Mexico KW - Holocene KW - stable isotopes KW - Cenozoic KW - sedimentary rocks KW - Salt Spring KW - dates KW - carbon KW - age KW - Valles Caldera KW - absolute age KW - travertine KW - Jemez Mountains KW - Ponderosa New Mexico KW - carbonate rocks KW - 03:Geochronology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563978?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=New+Mexico+Geology&rft.atitle=U-series+dating+and+stable+isotope+analysis+of+travertine+deposits+near+Ponderosa%2C+New+Mexico%3B+implications+for+defining+the+eastern+limit+of+the+Valles+outflow+plume&rft.au=Salaz%2C+R+E%3BKelley%2C+S+A%3BWoldeGabriel%2C+G%3BAlbrecht%2C+M%3BAnonymous&rft.aulast=Salaz&rft.aufirst=R&rft.date=2012-05-01&rft.volume=34&rft.issue=2&rft.spage=57&rft.isbn=&rft.btitle=&rft.title=New+Mexico+Geology&rft.issn=0196948X&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - New Mexico Geological Society spring meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - Last updated - 2012-11-29 N1 - CODEN - NMGED2 N1 - SubjectsTermNotLitGenreText - absolute age; age; C-13/C-12; carbon; carbonate rocks; Cenozoic; dates; Holocene; isotope ratios; isotopes; Jemez Mountains; New Mexico; O-18/O-16; oxygen; Ponderosa New Mexico; Quaternary; Salt Spring; sedimentary rocks; stable isotopes; travertine; United States; Valles Caldera ER - TY - JOUR T1 - The cross-scale science of CO sub(2) capture and storage: from pore scale to regional scale AN - 1034810723; 17013174 AB - We describe state-of-the-art science and technology related to modeling of CO sub(2) capture and storage (CCS) at four different process scales: pore, reservoir, site, and region scale. We present novel research at each scale to demonstrate why each scale is important for a comprehensive understanding of CCS. Further, we illustrate research linking adjacent process scales, such that critical information is passed from one process scale to the next adjacent scale. We demonstrate this cross-scale approach using real world CO sub(2) capture and storage data, including a scenario managing CO sub(2) emissions from a large U.S. electric utility. At the pore scale, we present a new method for incorporating pore-scale surface tension effects into a relative permeability model of CO sub(2)-brine multiphase flow at the reservoir scale. We benchmark a reduced complexity model for site-scale analysis against a rigorous physics-based reservoir simulator, and include new system level considerations including local site-scale pipeline routing analysis (i.e., reservoir to site scale). We also include costs associated with brine production and treatment at the site scale, a significant issue often overlooked in CCS studies. All models that comprise our total system include parameter uncertainty which leads to results that have ranges of probability. Results suggest that research at one scale is able to inform models at adjacent process scales, and that these scale connections can inform policy makers and utility managers of overall system behavior including the impacts of uncertainty. JF - Energy & Environmental Science AU - Middleton, Richard S AU - Keating, Gordon N AU - Stauffer, Philip H AU - Jordan, Amy B AU - Viswanathan, Hari S AU - Kang, Qinjun J AU - Carey, JWilliam AU - Mulkey, Marc L AU - Sullivan, Enid J AU - Chu, Shaoping P AU - Esposito, Richard AU - Meckel, Timothy A AD - Earth and Environmental Sciences Division; Los Alamos National Laboratory; Los Alamos; NM 87545; USA; +1 505 667-1628; +1 505 665-8332 Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 7328 EP - 7345 PB - Royal Society of Chemistry, c/o Springer-Verlag New York Inc. Secaucus New Jersey 07096 2485 United States VL - 5 IS - 6 SN - 1754-5692, 1754-5692 KW - Water Resources Abstracts; Environment Abstracts; Aqualine Abstracts KW - Reservoir Sites KW - Utilities KW - Permeability KW - Emissions KW - Pipelines KW - Reservoirs KW - Routing KW - Multiphase Flow KW - Model Studies KW - Storage KW - USA KW - Pores KW - Carbon dioxide KW - Benchmarks KW - Carbon Dioxide KW - Technology KW - ENA 03:Energy KW - SW 5040:Data acquisition KW - AQ 00006:Sewage UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1034810723?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Energy+%26+Environmental+Science&rft.atitle=The+cross-scale+science+of+CO+sub%282%29+capture+and+storage%3A+from+pore+scale+to+regional+scale&rft.au=Middleton%2C+Richard+S%3BKeating%2C+Gordon+N%3BStauffer%2C+Philip+H%3BJordan%2C+Amy+B%3BViswanathan%2C+Hari+S%3BKang%2C+Qinjun+J%3BCarey%2C+JWilliam%3BMulkey%2C+Marc+L%3BSullivan%2C+Enid+J%3BChu%2C+Shaoping+P%3BEsposito%2C+Richard%3BMeckel%2C+Timothy+A&rft.aulast=Middleton&rft.aufirst=Richard&rft.date=2012-05-01&rft.volume=5&rft.issue=6&rft.spage=7328&rft.isbn=&rft.btitle=&rft.title=Energy+%26+Environmental+Science&rft.issn=17545692&rft_id=info:doi/10.1039%2Fc2ee03227a LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-08-01 N1 - Number of references - 76 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Storage; Permeability; Emissions; Pipelines; Benchmarks; Carbon dioxide; Reservoirs; Utilities; Technology; Pores; Reservoir Sites; Routing; Multiphase Flow; Carbon Dioxide; Model Studies; USA DO - http://dx.doi.org/10.1039/c2ee03227a ER - TY - JOUR T1 - Transport by oscillatory flow in soils with rate limited mass transfer; 1, Theory AN - 1026859551; 2012-063276 JF - Vadose Zone Journal AU - Neeper, Donald A AU - Stauffer, Philip H Y1 - 2012/05// PY - 2012 DA - May 2012 SP - vzj2011.0093 PB - Soil Science Society of America, Madison, WI VL - 11 IS - 2 KW - United States KW - solute transport KW - chlorinated hydrocarbons KW - contaminant plumes KW - soil vapor extraction KW - unsaturated zone KW - observation wells KW - trichloroethane KW - New Mexico KW - Los Alamos County New Mexico KW - simulation KW - environmental management KW - water-rock interaction KW - transport KW - phase equilibria KW - movement KW - halogenated hydrocarbons KW - propagation KW - mass transfer KW - water pollution KW - geochemistry KW - diffusivity KW - soils KW - liquid phase KW - experimental studies KW - monitoring KW - pressure KW - gaseous phase KW - pollutants KW - numerical analysis KW - biochemistry KW - prediction KW - pollution KW - Los Alamos National Laboratory KW - concepts KW - porosity KW - gases KW - models KW - organic compounds KW - boreholes KW - soil pollution KW - mathematical methods KW - mobilization KW - waste disposal KW - water wells KW - permeability KW - field studies KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1026859551?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Vadose+Zone+Journal&rft.atitle=Transport+by+oscillatory+flow+in+soils+with+rate+limited+mass+transfer%3B+1%2C+Theory&rft.au=Neeper%2C+Donald+A%3BStauffer%2C+Philip+H&rft.aulast=Neeper&rft.aufirst=Donald&rft.date=2012-05-01&rft.volume=11&rft.issue=2&rft.spage=vzj2011.0093&rft.isbn=&rft.btitle=&rft.title=Vadose+Zone+Journal&rft.issn=1539-1663&rft_id=info:doi/10.2136%2Fvzj2011.0094 L2 - http://www.vadosezonejournal.org LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 12 N1 - PubXState - WI N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-07-19 N1 - SubjectsTermNotLitGenreText - biochemistry; boreholes; chlorinated hydrocarbons; concepts; contaminant plumes; diffusivity; environmental management; experimental studies; field studies; gaseous phase; gases; geochemistry; halogenated hydrocarbons; liquid phase; Los Alamos County New Mexico; Los Alamos National Laboratory; mass transfer; mathematical methods; mobilization; models; monitoring; movement; New Mexico; numerical analysis; observation wells; organic compounds; permeability; phase equilibria; pollutants; pollution; porosity; prediction; pressure; propagation; simulation; soil pollution; soil vapor extraction; soils; solute transport; transport; trichloroethane; United States; unsaturated zone; waste disposal; water pollution; water wells; water-rock interaction DO - http://dx.doi.org/10.2136/vzj2011.0094 ER - TY - JOUR T1 - Transport by oscillatory flow in soils with rate limited mass transfer; 2, Field experiment AN - 1026859543; 2012-063275 AB - This study provides experimental evidence for the analytic model of oscillatory transport in soils, in which a vapor or solute in an oscillating mobile gas or liquid undergoes rate-limited equilibration with an immobile phase. During a field test of passive soil vapor extraction, the concentrations of volatile organic compounds in the produced gas were monitored at 90-min intervals. The data were compared with the results of numerical simulations based on the mobile-immobile model of oscillatory transport. A dual-porosity simulation matched the data when the simulated time for equilibration between the mobile vapor and the immobile phases was one-third day and the flow was restricted to only 5% of the air-filled porosity. A purely diffusion calculation without flow, utilizing the exchange diffusivity derived from the mobile-immobile model, predicted total production of extracted vapor during a 1-yr interval in agreement with the simulation. This illustrates the utility of the exchange diffusivity as an evaluation tool for passive soil vapor extraction. JF - Vadose Zone Journal AU - Neeper, Donald A AU - Stauffer, Philip H Y1 - 2012/05// PY - 2012 DA - May 2012 SP - vzj2011.0094 PB - Soil Science Society of America, Madison, WI VL - 11 IS - 2 KW - United States KW - solute transport KW - chlorinated hydrocarbons KW - contaminant plumes KW - soil vapor extraction KW - unsaturated zone KW - observation wells KW - trichloroethane KW - New Mexico KW - Los Alamos County New Mexico KW - simulation KW - environmental management KW - water-rock interaction KW - transport KW - phase equilibria KW - movement KW - halogenated hydrocarbons KW - propagation KW - mass transfer KW - water pollution KW - geochemistry KW - diffusivity KW - soils KW - liquid phase KW - experimental studies KW - monitoring KW - pressure KW - gaseous phase KW - pollutants KW - numerical analysis KW - biochemistry KW - prediction KW - pollution KW - Los Alamos National Laboratory KW - porosity KW - gases KW - models KW - organic compounds KW - boreholes KW - soil pollution KW - mathematical methods KW - mobilization KW - waste disposal KW - water wells KW - permeability KW - field studies KW - 02C:Geochemistry of rocks, soils, and sediments KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1026859543?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Vadose+Zone+Journal&rft.atitle=Transport+by+oscillatory+flow+in+soils+with+rate+limited+mass+transfer%3B+2%2C+Field+experiment&rft.au=Neeper%2C+Donald+A%3BStauffer%2C+Philip+H&rft.aulast=Neeper&rft.aufirst=Donald&rft.date=2012-05-01&rft.volume=11&rft.issue=2&rft.spage=vzj2011.0094&rft.isbn=&rft.btitle=&rft.title=Vadose+Zone+Journal&rft.issn=1539-1663&rft_id=info:doi/10.2136%2Fvzj2011.0094 L2 - http://www.vadosezonejournal.org LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 12 N1 - PubXState - WI N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-07-19 N1 - SubjectsTermNotLitGenreText - biochemistry; boreholes; chlorinated hydrocarbons; contaminant plumes; diffusivity; environmental management; experimental studies; field studies; gaseous phase; gases; geochemistry; halogenated hydrocarbons; liquid phase; Los Alamos County New Mexico; Los Alamos National Laboratory; mass transfer; mathematical methods; mobilization; models; monitoring; movement; New Mexico; numerical analysis; observation wells; organic compounds; permeability; phase equilibria; pollutants; pollution; porosity; prediction; pressure; propagation; simulation; soil pollution; soil vapor extraction; soils; solute transport; transport; trichloroethane; United States; unsaturated zone; waste disposal; water pollution; water wells; water-rock interaction DO - http://dx.doi.org/10.2136/vzj2011.0094 ER - TY - JOUR T1 - Using high-performance computing to understand roles of labile and nonlabile uranium(vi) on Hanford 300 area plume longevity AN - 1026858702; 2012-063285 AB - Evolution of a hexavalent uranium [U(VI)] plume at the Hanford 300 Area bordering the Columbia River was investigated to evaluate the roles of labile and nonlabile forms of U(VI) on the longevity of the plume. A high fidelity, three-dimensional, field-scale, reactive flow and transport model was used to represent the system. Richards" equation coupled to multicomponent reactive transport equations were solved for times up to 100 yr, taking into account rapid fluctuations in the Columbia River stage resulting in pulse releases of U(VI) into the river. The petascale computer code PFLOTRAN developed under a Department of Energy Scientific Discovery through Advanced Computing (SciDAC-2) project was used in the simulations and executed on Oak Ridge National Laboratory's Jaguar XT5 Cray supercomputer. Labile U(VI) was represented in the model through surface complexation reactions and its nonlabile form through dissolution of metatorbernite used as a surrogate mineral. Initial conditions were constructed corresponding to the U(VI) plume already in place to avoid uncertainties associated with the lack of historical data for the waste stream. The cumulative U(VI) flux into the river was compared for cases of equilibrium and multirate sorption models and for no sorption, and its sensitivity on the initial plume configuration was investigated. The presence of nonlabile U(VI) was found to be essential in explaining the longevity of the U(VI) plume and the prolonged high U(VI) concentrations at the site exceeding the USEPA maximum contaminant level for U(VI). JF - Vadose Zone Journal AU - Lichtner, Peter C AU - Hammond, Glenn E AU - Seaman, John C AU - Chang, H AU - Goldberg, S AU - Simunek, Jirka Y1 - 2012/05// PY - 2012 DA - May 2012 SP - vzj2011.0097 PB - Soil Science Society of America, Madison, WI VL - 11 IS - 2 KW - United States KW - solute transport KW - sorption KW - contaminant plumes KW - rivers and streams KW - data processing KW - simulation KW - environmental analysis KW - ground water KW - water-rock interaction KW - transport KW - Richards equation KW - water pollution KW - geochemistry KW - hydrology KW - high-resolution methods KW - Washington KW - pollutants KW - Columbia River KW - pollution KW - Hanford Site KW - equations KW - hydrochemistry KW - boundary conditions KW - models KW - fluctuations KW - soil pollution KW - metals KW - mathematical methods KW - uranium KW - waste disposal KW - actinides KW - 22:Environmental geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1026858702?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Vadose+Zone+Journal&rft.atitle=Using+high-performance+computing+to+understand+roles+of+labile+and+nonlabile+uranium%28vi%29+on+Hanford+300+area+plume+longevity&rft.au=Lichtner%2C+Peter+C%3BHammond%2C+Glenn+E%3BSeaman%2C+John+C%3BChang%2C+H%3BGoldberg%2C+S%3BSimunek%2C+Jirka&rft.aulast=Lichtner&rft.aufirst=Peter&rft.date=2012-05-01&rft.volume=11&rft.issue=2&rft.spage=vzj2011.0097&rft.isbn=&rft.btitle=&rft.title=Vadose+Zone+Journal&rft.issn=1539-1663&rft_id=info:doi/10.2136%2Fvzj2011.0097 L2 - http://www.vadosezonejournal.org LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Soil Science Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 20 N1 - PubXState - WI N1 - Document feature - illus. N1 - Last updated - 2012-07-19 N1 - SubjectsTermNotLitGenreText - actinides; boundary conditions; Columbia River; contaminant plumes; data processing; environmental analysis; equations; fluctuations; geochemistry; ground water; Hanford Site; high-resolution methods; hydrochemistry; hydrology; mathematical methods; metals; models; pollutants; pollution; Richards equation; rivers and streams; simulation; soil pollution; solute transport; sorption; transport; United States; uranium; Washington; waste disposal; water pollution; water-rock interaction DO - http://dx.doi.org/10.2136/vzj2011.0097 ER - TY - JOUR T1 - Common bacterial responses in six ecosystems exposed to 10 years of elevated atmospheric carbon dioxide AN - 1014102958; 16610994 AB - Six terrestrial ecosystems in the USA were exposed to elevated atmospheric CO2 in single or multifactorial experiments for more than a decade to assess potential impacts. We retrospectively assessed soil bacterial community responses in all six-field experiments and found ecosystem-specific and common patterns of soil bacterial community response to elevated CO2. Soil bacterial composition differed greatly across the six ecosystems. No common effect of elevated atmospheric CO2 on bacterial biomass, richness and community composition across all of the ecosystems was identified, although significant responses were detected in individual ecosystems. The most striking common trend across the sites was a decrease of up to 3.5-fold in the relative abundance of Acidobacteria Group 1 bacteria in soils exposed to elevated CO2 or other climate factors. The Acidobacteria Group 1 response observed in exploratory 16S rRNA gene clone library surveys was validated in one ecosystem by 100-fold deeper sequencing and semi-quantitative PCR assays. Collectively, the 16S rRNA gene sequencing approach revealed influences of elevated CO2 on multiple ecosystems. Although few common trends across the ecosystems were detected in the small surveys, the trends may be harbingers of more substantive changes in less abundant, more sensitive taxa that can only be detected by deeper surveys. JF - Environmental Microbiology AU - Dunbar, John AU - Eichorst, Stephanie A AU - Gallegos-Graves, La Verne AU - Silva, Shannon AU - Xie, Gary AU - Hengartner, N W AU - Evans, RDavid AU - Hungate, Bruce A AU - Jackson, Robert B AU - Megonigal, JPatrick AU - Schadt, Christopher W AU - Vilgalys, Rytas AU - Zak, Donald R AU - Kuske, Cheryl R AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM, USA Y1 - 2012/05// PY - 2012 DA - May 2012 SP - 1145 EP - 1158 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 United States VL - 14 IS - 5 SN - 1462-2912, 1462-2912 KW - Microbiology Abstracts A: Industrial & Applied Microbiology; Meteorological & Geoastrophysical Abstracts; Microbiology Abstracts B: Bacteriology KW - Bacteria KW - Ecosystems KW - Climate KW - Abundance KW - Biomass KW - Soil microorganisms KW - USA KW - Bacteria in soil KW - Community composition KW - Terrestrial ecosystems KW - Meteorological literature KW - Polymerase chain reaction KW - Carbon dioxide KW - rRNA 16S KW - M2 551.510.3/.4:Physical Properties/Composition (551.510.3/.4) KW - A 01400:Soil Microbes KW - J 02450:Ecology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1014102958?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Microbiology&rft.atitle=Common+bacterial+responses+in+six+ecosystems+exposed+to+10+years+of+elevated+atmospheric+carbon+dioxide&rft.au=Dunbar%2C+John%3BEichorst%2C+Stephanie+A%3BGallegos-Graves%2C+La+Verne%3BSilva%2C+Shannon%3BXie%2C+Gary%3BHengartner%2C+N+W%3BEvans%2C+RDavid%3BHungate%2C+Bruce+A%3BJackson%2C+Robert+B%3BMegonigal%2C+JPatrick%3BSchadt%2C+Christopher+W%3BVilgalys%2C+Rytas%3BZak%2C+Donald+R%3BKuske%2C+Cheryl+R&rft.aulast=Dunbar&rft.aufirst=John&rft.date=2012-05-01&rft.volume=14&rft.issue=5&rft.spage=1145&rft.isbn=&rft.btitle=&rft.title=Environmental+Microbiology&rft.issn=14622912&rft_id=info:doi/10.1111%2Fj.1462-2920.2011.02695.x LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-05-01 N1 - Document feature - figure 6 N1 - Last updated - 2013-07-26 N1 - SubjectsTermNotLitGenreText - Community composition; Terrestrial ecosystems; Abundance; Climate; Polymerase chain reaction; Biomass; Carbon dioxide; rRNA 16S; Soil microorganisms; Bacteria in soil; Ecosystems; Meteorological literature; Bacteria; USA DO - http://dx.doi.org/10.1111/j.1462-2920.2011.02695.x ER - TY - JOUR T1 - Turbulent mixing in a Richtmyer-Meshkov fluid layer after reshock: velocity and density statistics AN - 1315609997; 17590258 AB - The properties of turbulent mixing in a Richtmyer-Meshkov (RM) unstable fluid layer are studied under the impact of a single shock followed by a reshock wave using simultaneous velocity-density measurements to provide new insights into the physics of RM mixing. The experiments were conducted on a varicose SF sub(6) fluid layer (heavy fluid) interposed in air (light fluid) inside a horizontal shock tube at an incident Mach number of 1.21 and a reflected reshock Mach number of 1.14. The light-heavy-light fluid layer is observed to develop a nonlinear growth pattern, with no transition to turbulence upon impact by a single shock (up to tU/ lambda = 23. 4). However, upon reshock, enhanced mixing between the heavy and light fluids along with a transition to a turbulent state characterized by the generation of significant turbulent velocity fluctuations ( sigma sub(u) / U similar to 0.3) is observed. The streamwise and spanwise root-mean-squared velocity fluctuation statistics show similar trends across the fluid layer after reshock, with no observable preference for the direction of the shock wave motion. The measured streamwise mass flux ( rho ' u') shows opposing signs on either side of the density peak within the fluid layer, consistent with the turbulent material transport being driven along the direction of the density gradient. Measurements of three of the six independent components of the general Reynolds stress tensor (R sub(ij) = rho sub(i) '' u sub(j) '') show that the self-correlation terms R sub(11) and R sub(22) are similar in magnitude across much of the fluid layer, and much larger than the cross-correlation term R sub(12). Most importantly, the Reynolds stresses (R sub(ij)) are dominated by the mean density, cross-velocity product term ( rho u sub(i)' u sub(j)'), with the mass flux product and triple correlation terms being negligibly smaller in comparison. A lack of homogeneous mixing (and, possibly, a long-term imprint of the initial conditions) is observed in the spanwise turbulent mass flux measurements, with important implications for the simulation and modelling of RM mixing flows. JF - Journal of Fluid Mechanics AU - Balakumar, B J AU - Orlicz, G C AU - Ristorcelli, J R AU - Balasubramanian, S AU - Prestridge, K P AU - Tomkins, C D AD - Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, bbalasub@gmail.com Y1 - 2012/04/10/ PY - 2012 DA - 2012 Apr 10 SP - 67 EP - 93 PB - Cambridge University Press, The Edinburgh Building, Cambridge CB2 2RU United Kingdom VL - 696 SN - 0022-1120, 0022-1120 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - Statistics KW - Statistical analysis KW - Turbulent mass flux KW - turbulence KW - Tubes KW - Population dynamics KW - Mixing KW - Mass flux KW - Fluid mechanics KW - Wave motion KW - Density gradients KW - Waves KW - Initial conditions KW - Reynolds stress KW - Density KW - Velocity KW - Stress KW - Turbulent mixing KW - Wave properties KW - Numerical simulations KW - Reynolds stresses KW - Fluctuations KW - Q2 09169:Fluid mechanics KW - M2 551.511:Mechanics and Thermodynamics of the Atmosphere (551.511) KW - SW 6070:Materials UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1315609997?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Fluid+Mechanics&rft.atitle=Turbulent+mixing+in+a+Richtmyer-Meshkov+fluid+layer+after+reshock%3A+velocity+and+density+statistics&rft.au=Balakumar%2C+B+J%3BOrlicz%2C+G+C%3BRistorcelli%2C+J+R%3BBalasubramanian%2C+S%3BPrestridge%2C+K+P%3BTomkins%2C+C+D&rft.aulast=Balakumar&rft.aufirst=B&rft.date=2012-04-10&rft.volume=696&rft.issue=&rft.spage=67&rft.isbn=&rft.btitle=&rft.title=Journal+of+Fluid+Mechanics&rft.issn=00221120&rft_id=info:doi/10.1017%2Fjfm.2012.8 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-03-01 N1 - Last updated - 2016-03-17 N1 - SubjectsTermNotLitGenreText - Fluid mechanics; Wave properties; Wave motion; Density gradients; Population dynamics; Reynolds stresses; Reynolds stress; Numerical simulations; Turbulent mass flux; Statistical analysis; Turbulent mixing; Initial conditions; Mass flux; Statistics; Density; Stress; Velocity; Waves; Tubes; turbulence; Fluctuations; Mixing DO - http://dx.doi.org/10.1017/jfm.2012.8 ER - TY - JOUR T1 - Response and resilience of soil biocrust bacterial communities to chronic physical disturbance in arid shrublands AN - 968175411; 16465923 AB - The impact of 10 years of annual foot trampling on soil biocrusts was examined in replicated field experiments at three cold desert sites of the Colorado Plateau, USA. Trampling detrimentally impacted lichens and mosses, and the keystone cyanobacterium, Microcoleus vaginatus, resulting in increased soil erosion and reduced C and N concentrations in surface soils. Trampled biocrusts contained approximately half as much extractable DNA and 20-52% less chlorophyll a when compared with intact biocrusts at each site. Two of the three sites also showed a decline in scytonemin-containing, diazotrophic cyanobacteria in trampled biocrusts. 16S rRNA gene sequence and terminal restriction fragment length polymorphism (T-RFLP) analyses of soil bacteria from untrampled and trampled biocrusts demonstrated a reduced proportion (23-65% reduction) of M. vaginatus and other Cyanobacteria in trampled plots. In parallel, other soil bacterial species that are natural residents of biocrusts, specifically members of the Actinobacteria, Chloroflexi and Bacteroidetes, became more readily detected in trampled than in untrampled biocrusts. Replicate 16S rRNA T-RFLP profiles from trampled biocrusts at all three sites contained significantly more fragments (n=17) than those of untrampled biocrusts (n less than or equal to 6) and exhibited much higher variability among field replicates, indicating transition to an unstable disturbed state. Despite the dramatic negative impacts of trampling on biocrust physical structure and composition, M. vaginatus could still be detected in surface soils after 10 years of annual trampling, suggesting the potential for biocrust re-formation over time. Physical damage of biocrusts, in concert with changing temperature and precipitation patterns, has potential to alter performance of dryland ecosystems for decades. JF - ISME Journal AU - Kuske, Cheryl R AU - Yeager, Chris M AU - Johnson, Shannon AU - Ticknor, Lawrence O AU - Belnap, Jayne AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM, USA Y1 - 2012/04// PY - 2012 DA - Apr 2012 SP - 886 EP - 897 PB - Nature Publishing Group, The Macmillan Building London N1 9XW United Kingdom VL - 6 IS - 4 SN - 1751-7362, 1751-7362 KW - Microbiology Abstracts A: Industrial & Applied Microbiology; Microbiology Abstracts B: Bacteriology KW - Chlorophyll KW - DNA KW - Deserts KW - Foot KW - Lichens KW - Precipitation KW - Restriction fragment length polymorphism KW - Soil erosion KW - Soil microorganisms KW - Temperature effects KW - Trampling KW - rRNA 16S KW - Microcoleus vaginatus KW - Cyanobacteria KW - Actinobacteria KW - A 01390:Forestry KW - J 02450:Ecology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/968175411?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=ISME+Journal&rft.atitle=Response+and+resilience+of+soil+biocrust+bacterial+communities+to+chronic+physical+disturbance+in+arid+shrublands&rft.au=Kuske%2C+Cheryl+R%3BYeager%2C+Chris+M%3BJohnson%2C+Shannon%3BTicknor%2C+Lawrence+O%3BBelnap%2C+Jayne&rft.aulast=Kuske&rft.aufirst=Cheryl&rft.date=2012-04-01&rft.volume=6&rft.issue=4&rft.spage=886&rft.isbn=&rft.btitle=&rft.title=ISME+Journal&rft.issn=17517362&rft_id=info:doi/10.1038%2Fismej.2011.153 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-04-01 N1 - Last updated - 2012-06-18 N1 - SubjectsTermNotLitGenreText - Temperature effects; Chlorophyll; Lichens; Deserts; DNA; Foot; Restriction fragment length polymorphism; Soil erosion; Precipitation; rRNA 16S; Trampling; Soil microorganisms; Microcoleus vaginatus; Cyanobacteria; Actinobacteria DO - http://dx.doi.org/10.1038/ismej.2011.153 ER - TY - JOUR T1 - Energy-critical elements for sustainable development AN - 1551624814; 20392685 AB - Energy-critical elements (ECEs) are chemical and isotopic species that are required for emerging sustainable energy sources and that might encounter supply disruptions. An oft-cited example is the rare-earth element neodymium used in high-strength magnets, but elements other than rare earths, for example, helium, are also considered ECEs. The relationships among abundance, markets, and geopolitics that constrain supply are at least as complex as the electronic and nuclear attributes that make ECEs valuable. In an effort to ensure supply for renewable-energy technologies, science decision makers are formulating policies to mitigate supply risk, sometimes without full view of the complexity of important factors, such as unanticipated market responses to policy, societys needs for these elements in the course of basic research, and a lack of substitutes for utterly unique physical properties. This article places ECEs in historical context, highlights relevant market factors, and reviews policy recommendations made by various studies and governments. Actions taken by the United States and other countries are also described. Although availability and scarcity are related, many ECEs are relatively common yet their supply is at risk. Sustainable development requires informed action and cooperation between governments, industries, and researchers. JF - M R S Bulletin AU - Hurd, Alan J AU - Kelley, Ronald L AU - Eggert, Roderick G AU - Lee, Min-Ha AD - Los Alamos National Laboratory, Los Alamos, NM, USA; , ajhurd@lanl.gov Y1 - 2012/04// PY - 2012 DA - Apr 2012 SP - 405 EP - 410 PB - Cambridge University Press, The Edinburgh Building, Cambridge CB2 2RU United Kingdom VL - 37 IS - 4 SN - 0883-7694, 0883-7694 KW - Sustainability Science Abstracts KW - Sustainable development KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1551624814?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=M+R+S+Bulletin&rft.atitle=Energy-critical+elements+for+sustainable+development&rft.au=Hurd%2C+Alan+J%3BKelley%2C+Ronald+L%3BEggert%2C+Roderick+G%3BLee%2C+Min-Ha&rft.aulast=Hurd&rft.aufirst=Alan&rft.date=2012-04-01&rft.volume=37&rft.issue=4&rft.spage=405&rft.isbn=&rft.btitle=&rft.title=M+R+S+Bulletin&rft.issn=08837694&rft_id=info:doi/10.1557%2Fmrs.2012.54 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-08-01 N1 - Number of references - 10 N1 - Last updated - 2015-03-20 N1 - SubjectsTermNotLitGenreText - Sustainable development DO - http://dx.doi.org/10.1557/mrs.2012.54 ER - TY - JOUR T1 - Geologic logging and aquifer testing results from the City of Santa Fe's 2,663 foot exploratory well AN - 1220564821; 2013-001933 JF - Open File Report (Socorro, N.M.) AU - Borchert, Claudia I AU - Finch, Steve AU - Longmire, Patrick A Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 3 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - well logs KW - observation wells KW - New Mexico KW - ground water KW - aquifers KW - Cenozoic KW - pump tests KW - Tertiary KW - sedimentary rocks KW - hydrostratigraphy KW - Santa Fe New Mexico KW - Neogene KW - Santa Fe County New Mexico KW - Tesuque Formation KW - drilling KW - water resources KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220564821?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Geologic+logging+and+aquifer+testing+results+from+the+City+of+Santa+Fe%27s+2%2C663+foot+exploratory+well&rft.au=Borchert%2C+Claudia+I%3BFinch%2C+Steve%3BLongmire%2C+Patrick+A&rft.aulast=Borchert&rft.aufirst=Claudia&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=3&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - aquifers; Cenozoic; drilling; ground water; hydrostratigraphy; Neogene; New Mexico; observation wells; pump tests; Santa Fe County New Mexico; Santa Fe New Mexico; sedimentary rocks; Tertiary; Tesuque Formation; United States; water resources; well logs ER - TY - JOUR T1 - Seismic investigations of an accommodation zone in the northern Rio Grande Rift, New Mexico, USA AN - 1220564814; 2013-001932 JF - Open File Report (Socorro, N.M.) AU - Baldridge, W Scott AU - Valdes, Jessidee AU - Nedorub, Olga AU - Phrampus, Benjamin AU - Braile, Lawrence AU - Ferguson, John AU - Benage, Mary AU - Litherland, Mairi Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 2 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - North America KW - Quaternary KW - rift zones KW - Eocene KW - geophysical methods KW - reflection methods KW - Paleogene KW - New Mexico KW - refraction methods KW - seismic methods KW - Rio Grande Rift KW - Cenozoic KW - kinematics KW - Tertiary KW - sedimentary rocks KW - neotectonics KW - tectonics KW - accommodation zones KW - faults KW - 16:Structural geology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220564814?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Seismic+investigations+of+an+accommodation+zone+in+the+northern+Rio+Grande+Rift%2C+New+Mexico%2C+USA&rft.au=Baldridge%2C+W+Scott%3BValdes%2C+Jessidee%3BNedorub%2C+Olga%3BPhrampus%2C+Benjamin%3BBraile%2C+Lawrence%3BFerguson%2C+John%3BBenage%2C+Mary%3BLitherland%2C+Mairi&rft.aulast=Baldridge&rft.aufirst=W&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=2&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - accommodation zones; Cenozoic; Eocene; faults; geophysical methods; kinematics; neotectonics; New Mexico; North America; Paleogene; Quaternary; reflection methods; refraction methods; rift zones; Rio Grande Rift; sedimentary rocks; seismic methods; tectonics; Tertiary; United States ER - TY - JOUR T1 - Uranium deposits in the Espanola Basin, Santa Fe County, New Mexico AN - 1220563697; 2013-001945 JF - Open File Report (Socorro, N.M.) AU - McLemore, Virginia T AU - McQuillan, Dennis AU - Longmire, Patrick A AU - Vaniman, David Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 15 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - bedrock KW - resources KW - pollutants KW - host rocks KW - pollution KW - New Mexico KW - drinking water KW - ground water KW - aquifers KW - Cenozoic KW - uranium ores KW - Tertiary KW - mineral composition KW - Neogene KW - metal ores KW - Santa Fe County New Mexico KW - mineralization KW - Tesuque Formation KW - water pollution KW - Espanola Basin KW - 27A:Economic geology, geology of ore deposits KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563697?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Uranium+deposits+in+the+Espanola+Basin%2C+Santa+Fe+County%2C+New+Mexico&rft.au=McLemore%2C+Virginia+T%3BMcQuillan%2C+Dennis%3BLongmire%2C+Patrick+A%3BVaniman%2C+David&rft.aulast=McLemore&rft.aufirst=Virginia&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=15&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - aquifers; bedrock; Cenozoic; drinking water; Espanola Basin; ground water; host rocks; metal ores; mineral composition; mineralization; Neogene; New Mexico; pollutants; pollution; resources; Santa Fe County New Mexico; Tertiary; Tesuque Formation; United States; uranium ores; water pollution ER - TY - JOUR T1 - Hydrogeochemical characterization of the Canada well, Santa Fe, New Mexico AN - 1220563692; 2013-001944 JF - Open File Report (Socorro, N.M.) AU - Longmire, Patrick A AU - Borchert, Claudia I AU - Dale, Michael R AU - Rearick, Michael S AU - Perkins, George B AU - Wiman, Stephen Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 14 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - oxygen KW - isotopes KW - characterization KW - New Mexico KW - stable isotopes KW - ground water KW - Cenozoic KW - carbon KW - Santa Fe County New Mexico KW - Tesuque Formation KW - geochemistry KW - isotope ratios KW - C-13/C-12 KW - Canada monitoring well KW - O-18/O-16 KW - hydrochemistry KW - aquifers KW - Tertiary KW - Agua Fria Well KW - D/H KW - Santa Fe New Mexico KW - Neogene KW - hydrogen KW - Espinaso Formation KW - 21:Hydrogeology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563692?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Hydrogeochemical+characterization+of+the+Canada+well%2C+Santa+Fe%2C+New+Mexico&rft.au=Longmire%2C+Patrick+A%3BBorchert%2C+Claudia+I%3BDale%2C+Michael+R%3BRearick%2C+Michael+S%3BPerkins%2C+George+B%3BWiman%2C+Stephen&rft.aulast=Longmire&rft.aufirst=Patrick&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=14&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - Agua Fria Well; aquifers; C-13/C-12; Canada monitoring well; carbon; Cenozoic; characterization; D/H; Espinaso Formation; geochemistry; ground water; hydrochemistry; hydrogen; isotope ratios; isotopes; Neogene; New Mexico; O-18/O-16; oxygen; Santa Fe County New Mexico; Santa Fe New Mexico; stable isotopes; Tertiary; Tesuque Formation; United States ER - TY - JOUR T1 - The Espanola Basin 3-D geologic framework model AN - 1220563667; 2013-001940 JF - Open File Report (Socorro, N.M.) AU - Jacobs, Elaine P AU - Cole, Gregory L Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 10 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - hydrology KW - three-dimensional models KW - ArcGIS KW - watersheds KW - mapping KW - New Mexico KW - ArcInfo KW - preferential flow KW - ground water KW - models KW - Cenozoic KW - STATEMAP KW - Santa Fe Group KW - geographic information systems KW - hydrostratigraphy KW - Jemez Mountains KW - information systems KW - Espanola Basin KW - digitization KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563667?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=The+Espanola+Basin+3-D+geologic+framework+model&rft.au=Jacobs%2C+Elaine+P%3BCole%2C+Gregory+L&rft.aulast=Jacobs&rft.aufirst=Elaine&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=10&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - ArcGIS; ArcInfo; Cenozoic; digitization; Espanola Basin; geographic information systems; ground water; hydrology; hydrostratigraphy; information systems; Jemez Mountains; mapping; models; New Mexico; preferential flow; Santa Fe Group; STATEMAP; three-dimensional models; United States; watersheds ER - TY - JOUR T1 - Chromium speciation and distribution in the vadose zone and regional aquifer materials beneath the Pajarito Plateau, Los Alamos, New Mexico AN - 1220563649; 2013-001937 JF - Open File Report (Socorro, N.M.) AU - Ding, Mei AU - Longmire, Patrick A AU - Vaniman, David AU - Broxton, David AU - Rearick, Michael S AU - Spall, Brian AU - Ware, Douglas AU - Katzman, Danny Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 7 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - pollutants KW - Pajarito Plateau KW - unsaturated zone KW - pollution KW - New Mexico KW - Los Alamos County New Mexico KW - distribution KW - X-ray spectra KW - ground water KW - aquifers KW - XANES spectra KW - metals KW - spectra KW - water pollution KW - chromium KW - chemical fractionation KW - 02B:Hydrochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563649?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Chromium+speciation+and+distribution+in+the+vadose+zone+and+regional+aquifer+materials+beneath+the+Pajarito+Plateau%2C+Los+Alamos%2C+New+Mexico&rft.au=Ding%2C+Mei%3BLongmire%2C+Patrick+A%3BVaniman%2C+David%3BBroxton%2C+David%3BRearick%2C+Michael+S%3BSpall%2C+Brian%3BWare%2C+Douglas%3BKatzman%2C+Danny&rft.aulast=Ding&rft.aufirst=Mei&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=7&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - aquifers; chemical fractionation; chromium; distribution; ground water; Los Alamos County New Mexico; metals; New Mexico; Pajarito Plateau; pollutants; pollution; spectra; United States; unsaturated zone; water pollution; X-ray spectra; XANES spectra ER - TY - JOUR T1 - Hydrogeochemical and stable isotope characteristics of the upper confined aquifer, Buckman well field, New Mexico AN - 1220563643; 2013-001936 JF - Open File Report (Socorro, N.M.) AU - Dale, Michael R AU - Longmire, Patrick A AU - Granzow, Kim P AU - Martinez, Dan'l A Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 6 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - concentration KW - oxygen KW - isotopes KW - isotope ratios KW - confined aquifers KW - C-13/C-12 KW - O-18/O-16 KW - New Mexico KW - hydrochemistry KW - stable isotopes KW - aquifers KW - radioactive isotopes KW - S-34/S-32 KW - D/H KW - hydrogen KW - carbon KW - sulfur KW - Buckman well field KW - C-14 KW - chemical composition KW - geochemistry KW - 21:Hydrogeology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563643?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Hydrogeochemical+and+stable+isotope+characteristics+of+the+upper+confined+aquifer%2C+Buckman+well+field%2C+New+Mexico&rft.au=Dale%2C+Michael+R%3BLongmire%2C+Patrick+A%3BGranzow%2C+Kim+P%3BMartinez%2C+Dan%27l+A&rft.aulast=Dale&rft.aufirst=Michael&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=6&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - aquifers; Buckman well field; C-13/C-12; C-14; carbon; chemical composition; concentration; confined aquifers; D/H; geochemistry; hydrochemistry; hydrogen; isotope ratios; isotopes; New Mexico; O-18/O-16; oxygen; radioactive isotopes; S-34/S-32; stable isotopes; sulfur; United States ER - TY - JOUR T1 - Radiocarbon dating and paleohydrology of regional aquifer groundwater beneath the Pajarito Plateau, New Mexico AN - 1220563637; 2013-001935 JF - Open File Report (Socorro, N.M.) AU - Dale, Michael R AU - Longmire, Patrick A AU - Granzow, Kim P AU - Martinez, Dan'l A AU - Perkins, Courtney A AU - Rearick, Michael S AU - Perkins, George B Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 5 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - Quaternary KW - oxygen KW - isotopes KW - paleohydrology KW - isotope ratios KW - Pajarito Plateau KW - O-18/O-16 KW - New Mexico KW - Puye Formation KW - hydrochemistry KW - Holocene KW - stable isotopes KW - climate change KW - ground water KW - aquifers KW - Cenozoic KW - recharge KW - D/H KW - hydrogen KW - carbon KW - C-13 KW - geochemistry KW - 24:Quaternary geology KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563637?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Radiocarbon+dating+and+paleohydrology+of+regional+aquifer+groundwater+beneath+the+Pajarito+Plateau%2C+New+Mexico&rft.au=Dale%2C+Michael+R%3BLongmire%2C+Patrick+A%3BGranzow%2C+Kim+P%3BMartinez%2C+Dan%27l+A%3BPerkins%2C+Courtney+A%3BRearick%2C+Michael+S%3BPerkins%2C+George+B&rft.aulast=Dale&rft.aufirst=Michael&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=5&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2013-04-19 N1 - SubjectsTermNotLitGenreText - aquifers; C-13; carbon; Cenozoic; climate change; D/H; geochemistry; ground water; Holocene; hydrochemistry; hydrogen; isotope ratios; isotopes; New Mexico; O-18/O-16; oxygen; Pajarito Plateau; paleohydrology; Puye Formation; Quaternary; recharge; stable isotopes; United States ER - TY - JOUR T1 - Occurrence and geochemistry of drinking-water contaminants, southern Espanola Basin AN - 1220563583; 2013-001950 JF - Open File Report (Socorro, N.M.) AU - Wiman, Stephen AU - Longmire, Patrick AU - McQuillan, Dennis AU - Rearick, Michael S Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 20 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - concentration KW - pollutants KW - pollution KW - New Mexico KW - hydrochemistry KW - drinking water KW - ground water KW - aquifers KW - Santa Fe County New Mexico KW - chemical composition KW - water pollution KW - geochemistry KW - Espanola Basin KW - 02B:Hydrochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563583?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Occurrence+and+geochemistry+of+drinking-water+contaminants%2C+southern+Espanola+Basin&rft.au=Wiman%2C+Stephen%3BLongmire%2C+Patrick%3BMcQuillan%2C+Dennis%3BRearick%2C+Michael+S&rft.aulast=Wiman&rft.aufirst=Stephen&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=20&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - aquifers; chemical composition; concentration; drinking water; Espanola Basin; geochemistry; ground water; hydrochemistry; New Mexico; pollutants; pollution; Santa Fe County New Mexico; United States; water pollution ER - TY - JOUR T1 - Sources, mobility, and groundwater occurrence of uranium in the eastern Espanola Basin region AN - 1220563566; 2013-001946 JF - Open File Report (Socorro, N.M.) AU - McQuillan, Dennis AU - McLemore, Virginia T AU - Longmire, Patrick A AU - Vaniman, David AU - Simmons, Ardyth AU - Koning, Daniel J Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 16 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - concentration KW - New Mexico KW - hydrochemistry KW - uranium minerals KW - ground water KW - aquifers KW - provenance KW - mineral composition KW - metals KW - Santa Fe County New Mexico KW - uranium KW - water wells KW - mobility KW - geochemistry KW - actinides KW - Espanola Basin KW - 02B:Hydrochemistry KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220563566?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Sources%2C+mobility%2C+and+groundwater+occurrence+of+uranium+in+the+eastern+Espanola+Basin+region&rft.au=McQuillan%2C+Dennis%3BMcLemore%2C+Virginia+T%3BLongmire%2C+Patrick+A%3BVaniman%2C+David%3BSimmons%2C+Ardyth%3BKoning%2C+Daniel+J&rft.aulast=McQuillan&rft.aufirst=Dennis&rft.date=2012-04-01&rft.volume=&rft.issue=&rft.spage=16&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/downloads/OFR500-599/526-550/546/ofr_546.pdf LA - English DB - GeoRef N1 - Conference title - 10th annual Espanola Basin workshop; Espanola Basin surface and groundwater quality N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-11-29 N1 - SubjectsTermNotLitGenreText - actinides; aquifers; concentration; Espanola Basin; geochemistry; ground water; hydrochemistry; metals; mineral composition; mobility; New Mexico; provenance; Santa Fe County New Mexico; United States; uranium; uranium minerals; water wells ER - TY - JOUR T1 - A whole-Moon thermal history model of Europa; impact of hydrothermal circulation and salt transport AN - 1037241213; 2012-078526 JF - Icarus AU - Travis, B J AU - Palguta, J AU - Schubert, G Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 1006 EP - 1019 PB - Elsevier, New York, NY VL - 218 IS - 2 SN - 0019-1035, 0019-1035 KW - silicates KW - icy satellites KW - plumes KW - Europa Satellite KW - subsurface ocean KW - radiogenic heating KW - mantle KW - astrobiology KW - Galilean satellites KW - turbulence KW - salinity KW - freezing KW - thermal history KW - ice shell KW - buoyancy KW - sedimentary rocks KW - transport KW - dynamics KW - circulation KW - mixing KW - tidal dissipative heating KW - satellites KW - chemically precipitated rocks KW - numerical models KW - Moon KW - differentiation KW - convection KW - evaporites KW - hydrothermal conditions KW - planetary interiors KW - brines KW - heating KW - permeability KW - salt KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241213?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=A+whole-Moon+thermal+history+model+of+Europa%3B+impact+of+hydrothermal+circulation+and+salt+transport&rft.au=Travis%2C+B+J%3BPalguta%2C+J%3BSchubert%2C+G&rft.aulast=Travis&rft.aufirst=B&rft.date=2012-04-01&rft.volume=218&rft.issue=2&rft.spage=1006&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.02.008 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 99 N1 - PubXState - NY N1 - Document feature - illus. N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-08-31 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - astrobiology; brines; buoyancy; chemically precipitated rocks; circulation; convection; differentiation; dynamics; Europa Satellite; evaporites; freezing; Galilean satellites; heating; hydrothermal conditions; ice shell; icy satellites; mantle; mixing; Moon; numerical models; permeability; planetary interiors; plumes; radiogenic heating; salinity; salt; satellites; sedimentary rocks; silicates; subsurface ocean; thermal history; tidal dissipative heating; transport; turbulence DO - http://dx.doi.org/10.1016/j.icarus.2012.02.008 ER - TY - JOUR T1 - The Southern Ocean and Its Climate in CCSM4 AN - 1017958028; 16574597 AB - The new Community Climate System Model, version 4 (CCSM4), provides a powerful tool to understand and predict the earth's climate system. Several aspects of the Southern Ocean in the CCSM4 are explored, including the surface climatology and interannual variability, simulation of key climate water masses (Antarctic Bottom Water, Subantarctic Mode Water, and Antarctic Intermediate Water), the transport and structure of the Antarctic Circumpolar Current, and interbasin exchange via the Agulhas and Tasman leakages and at the Brazil-Malvinas Confluence. It is found that the CCSM4 has varying degrees of accuracy in the simulation of the climate of the Southern Ocean when compared with observations. This study has identified aspects of the model that warrant further analysis that will result in a more comprehensive understanding of ocean-atmosphere-ice dynamics and interactions that control the earth's climate and its variability. JF - Journal of Climate AU - Weijer, Wilbert AU - Sloyan, Bernadette M AU - Maltrud, Mathew E AU - Jeffery, Nicole AU - Hecht, Matthew W AU - Hartin, Corinne A AU - Sebille, Erik van AU - Wainer, Ilana AD - Los Alamos National Laboratory, Los Alamos, New Mexico Y1 - 2012/04// PY - 2012 DA - April 2012 SP - 2652 EP - 2675 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 25 IS - 8 SN - 0894-8755, 0894-8755 KW - Meteorological & Geoastrophysical Abstracts; Sustainability Science Abstracts; Oceanic Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Bottom water KW - AS, Tropical Atlantic, Antarctic Intermediate Water KW - Climate change KW - AS, Equatorial Atlantic, Antarctic Bottom Water KW - Climatic variability KW - PS, Antarctic Ocean, Antarctic Circumpolar Current KW - Ocean-atmosphere system KW - Climatology KW - ISW, West Indian Ocean, Agulhas Current KW - Marine KW - ASW, Atlantic, Brazil-Malvinas Confluence KW - Antarctic bottom water KW - Leakage KW - Climate models KW - Intermediate water masses KW - Ocean circulation KW - Simulation KW - Subantarctic mode water KW - Antarctic Intermediate Water KW - Currents KW - Interannual variability KW - Numerical simulations KW - Oceans KW - PS, Antarctic Ocean KW - Oceanographic data KW - Q2 09164:Ocean circulation and currents KW - O 2010:Physical Oceanography KW - M3 1010:Issues in Sustainable Development KW - M2 551.58:Climatology (551.58) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1017958028?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Climate&rft.atitle=The+Southern+Ocean+and+Its+Climate+in+CCSM4&rft.au=Weijer%2C+Wilbert%3BSloyan%2C+Bernadette+M%3BMaltrud%2C+Mathew+E%3BJeffery%2C+Nicole%3BHecht%2C+Matthew+W%3BHartin%2C+Corinne+A%3BSebille%2C+Erik+van%3BWainer%2C+Ilana&rft.aulast=Weijer&rft.aufirst=Wilbert&rft.date=2012-04-01&rft.volume=25&rft.issue=8&rft.spage=2652&rft.isbn=&rft.btitle=&rft.title=Journal+of+Climate&rft.issn=08948755&rft_id=info:doi/10.1175%2FJCLI-D-11-00302.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-05-01 N1 - Number of references - 107 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Bottom water; Intermediate water masses; Climate change; Ocean-atmosphere system; Simulation; Ocean circulation; Climatology; Antarctic Intermediate Water; Antarctic bottom water; Interannual variability; Climate models; Climatic variability; Numerical simulations; Subantarctic mode water; Oceanographic data; Currents; Leakage; Oceans; AS, Equatorial Atlantic, Antarctic Bottom Water; ASW, Atlantic, Brazil-Malvinas Confluence; AS, Tropical Atlantic, Antarctic Intermediate Water; PS, Antarctic Ocean, Antarctic Circumpolar Current; PS, Antarctic Ocean; ISW, West Indian Ocean, Agulhas Current; Marine DO - http://dx.doi.org/10.1175/JCLI-D-11-00302.1 ER - TY - JOUR T1 - Microstructural Evolution and Dislocation Density Analysis of HT9 Steel Irradiated in the FFTF AN - 1671582411; 18027492 AB - HT9 steel is a ferritic/martensitic alloy being considered for use in fuel cladding in fast reactors in order to achieve high fuel burnup. The microstructural evolution, texture, and dislocation density of an HT9 duct were examined following the six-year irradiation of a fuel assembly in the Fast Flux Test Reactor Facility (FFTF). Material obtained from several positions within the assembly produced samples with a wide range of irradiation dose and irradiation temperature history. Synchrotron x-ray diffraction measurements were performed at beamline 1-ID at the Advanced Photon Source. Using the Convolutional Multiple Whole Profile (CMWP) fitting technique of evaluating dislocation contribution to line broadening, we show that irradiation temperature, rather than dose, most significantly controls dislocation density, with higher temperatures correlating to lower dislocation densities. Further, neutron diffraction texture measurements show larger texture evolution at higher doses. The results of synchrotron XRD deformation experiments and annealing experiments will also be presented. JF - AIP Conference Proceedings AU - Mosbrucker, Paula AU - Brown, Donald AU - Balogh, Levente AU - Maloy, Stuart AU - Sisneros, Thomas AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Solid State and Superconductivity Abstracts (SO); METADEX (MD); Environmental Engineering Abstracts (EN) KW - Duplex stainless steels KW - Ferritic stainless steels KW - Martensitic stainless steels KW - HT9 KW - Reactors KW - Surface layer KW - Irradiation KW - Fuels KW - Dislocation density KW - Evolution KW - Texture KW - Alloy steels UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671582411?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Microstructural+Evolution+and+Dislocation+Density+Analysis+of+HT9+Steel+Irradiated+in+the+FFTF&rft.au=Mosbrucker%2C+Paula%3BBrown%2C+Donald%3BBalogh%2C+Levente%3BMaloy%2C+Stuart%3BSisneros%2C+Thomas&rft.aulast=Mosbrucker&rft.aufirst=Paula&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-07-01 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - Multi-Scale Modeling of Fission Gas Evolution in UO2 AN - 1671455991; 18028487 AB - Fission gases in uranium dioxide (UO2) nuclear fuels, of which Xe is one of the most prominent, influence fuel performance during reactor operation and have implications for accident scenarios. Their behavior, including the nucleation and growth of fission gas bubbles, is a multiscale problem. We use a multiscale modeling approach to understand the behavior of Xe in UO2 as a function of microstructure by considering the effect of different types of grain boundaries on the evolution of Xe. Using density functional theory we calculate the activation energies for Xe diffusion in UO2 plus or minus x and we determine the interaction of Xe with different types of grain boundaries in UO2 using molecular statics. These results are then input into amesoscale model that predicts the evolution of Xe as a function of microstructure containing different distributions of grain boundaries. We find that the evolution of Xe depends significantly on the microstructure. JF - AIP Conference Proceedings AU - Uberuaga, Blas AU - Andersson, David AU - Liu, Xiang-Yang AU - Nerikar, Pankaj AU - Stanek, Christopher AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Solid State and Superconductivity Abstracts (SO); Environmental Engineering Abstracts (EN) KW - Nucleation KW - Nuclear fission KW - Nuclear power generation KW - Mathematical models KW - Grain boundaries KW - Nuclear reactor components KW - Microstructure KW - Evolution UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671455991?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Multi-Scale+Modeling+of+Fission+Gas+Evolution+in+UO2&rft.au=Uberuaga%2C+Blas%3BAndersson%2C+David%3BLiu%2C+Xiang-Yang%3BNerikar%2C+Pankaj%3BStanek%2C+Christopher&rft.aulast=Uberuaga&rft.aufirst=Blas&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-07-01 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - Atomic Cu/Nb Interface Structures Characterized by Transmission Electron Microscopy AN - 1671455838; 18028418 AB - Cu/Nb nanosize multilayered composites have shown high strength and high ductility which are due to their high density of interfaces. In this work, Cu/Nb nanolayered composites were prepared by accumulative roll bonding (ARB). To understand the interface effect on mechanical behavior, atomic Cu/Nb interface structures were studied by (scanning) transmission electron microscopy (TEM). It was found that Cu and Nb often have {112} KS orientation relationship, and their interfaces are faceted. The faceted interfaces are closely linked to twinning in Cu. Also, composition gradients at the interfaces were characterized by scanning transmission electron microscopy (STEM), energy dispersive X-ray spectroscopy (EDS) and electron energy loss spectroscopy (EELS). The effect of deformation on intermixture of Cu and Nb, as well as O segregation at the interfaces will be discussed. JF - AIP Conference Proceedings AU - Zheng, Shijian AU - Han, Weizhong AU - Dickerson, Robert AU - Mara, Nathan AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Solid State and Superconductivity Abstracts (SO); Environmental Engineering Abstracts (EN) KW - Scanning electron microscopy KW - Niobium KW - Nanomaterials KW - Atomic structure KW - Scanning transmission electron microscopy KW - Copper KW - Electron energy loss spectroscopy KW - Nanostructure UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671455838?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Atomic+Cu%2FNb+Interface+Structures+Characterized+by+Transmission+Electron+Microscopy&rft.au=Zheng%2C+Shijian%3BHan%2C+Weizhong%3BDickerson%2C+Robert%3BMara%2C+Nathan&rft.aulast=Zheng&rft.aufirst=Shijian&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-07-01 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - Gas Evolution from Lithium Hydride During X-Irradiation AN - 1372611661; 18029471 AB - Lithium hydride (LiH) is a highly reactive solid that may be used in radiation environments, where ionizing radiation is present that can disrupt the structure of a material. This disruption creates defects and can produce gases, most obviously H2 gas; irradiation of LiH corrosion products may produce further gases. We have performed introductory experiments to determine the effects of radiolysis on LiH and its ubiquitous hydrolysis product, LiOH. Our experiments focus on x-ray irradiations. We have used a particle accelerator in the Ion Beam Materials Laboratory to produce characteristic x-rays at desired energies from metal targets. During irradiation, evolved gases were measured, particularly H2, and quantified. Our data allows prediction of concentrations that could be released over time. JF - AIP Conference Proceedings AU - Haertling, Carol AU - Tesmer, Joseph AU - Wang, Yongqiang AU - McAlexander, William AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Prediction KW - Metals KW - Gases KW - Conferences KW - Irradiation KW - Ionizing radiation KW - Particulates KW - Hydrolysis KW - Lithium KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372611661?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Gas+Evolution+from+Lithium+Hydride+During+X-Irradiation&rft.au=Haertling%2C+Carol%3BTesmer%2C+Joseph%3BWang%2C+Yongqiang%3BMcAlexander%2C+William&rft.aulast=Haertling&rft.aufirst=Carol&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Prediction; Metals; Gases; Conferences; Ionizing radiation; Irradiation; Particulates; Hydrolysis; Lithium ER - TY - JOUR T1 - The Role of Interfaces on Shock-Induced Damage in Two Phase Metals AN - 1372610207; 18029274 AB - For ductile metals, the process of dynamic fracture during shock loading is thought to occur through nucleation of voids, void growth, and then coalescence that leads to material failure. Particularly for high purity metals, it has been observed by numerous investigators that voids appear to heterogeneously nucleate at grain boundaries. However, for materials of engineering significance, those with inclusions, second phase particles, or chemical banding it is less clear what the role of grain boundaries versus other types of interfaces in the metal will be on nucleation of damage. To approach this problem four materials have been systematically investigated: (1) high purity copper, (2) copper with 1% lead, (3) 260 brass, and (4) leaded 360 brass. The role of lead at grain boundaries and its behavior during shock loading will be discussed in conjunction with the results from experiments and Molecular Dynamics simulations. JF - AIP Conference Proceedings AU - Fensin, Saryu AU - Cerreta, Ellen AU - Valone, Steven AU - Gray, George AU - Farrow, Adam AU - Trujillo, Carl AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Metals KW - Conferences KW - Simulation KW - Copper KW - Particulates KW - Grains KW - Lead KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372610207?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=The+Role+of+Interfaces+on+Shock-Induced+Damage+in+Two+Phase+Metals&rft.au=Fensin%2C+Saryu%3BCerreta%2C+Ellen%3BValone%2C+Steven%3BGray%2C+George%3BFarrow%2C+Adam%3BTrujillo%2C+Carl&rft.aulast=Fensin&rft.aufirst=Saryu&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Metals; Conferences; Simulation; Particulates; Copper; Grains; Lead; Technology ER - TY - JOUR T1 - Effect of Release Rate on the Dynamic Tensile Response of Polycrystalline Copper AN - 1372610182; 18028874 AB - Plate-impact experiments were conducted to examine the effect of release or de-compression rate on the dynamic tensile response of high purity copper samples. Samples with similar grain size and other microstructural features were subjected to a variety of shock-loading conditions. The compressive stresses were in the 1.5-2.5 GPa range and the release rates were modified by using copper, z-quartz and aluminum impactors. The free-surface velocity histories showed increasing values of strength with increasing release rate. Accordingly, the volume fraction of damage (voids) was observed to decrease as the release rates were increase. In addition, an accompanying large plastic dissipation, in the form of grain misorientation measured by means of electron backscatter diffraction, was present in the samples deformed at higher release rates, suggesting a time dependent behavior of the process that converts plastic dissipation into void growth. JF - AIP Conference Proceedings AU - Escobedo, Juan AU - Cerreta, Ellen AU - Dennis-Koller, Darcie AU - Trujillo, Carl AU - Bronkhorst, Curt AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Particle size KW - Historical account KW - Conferences KW - Aluminum KW - Velocity KW - Stress KW - Copper KW - Grains KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372610182?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Effect+of+Release+Rate+on+the+Dynamic+Tensile+Response+of+Polycrystalline+Copper&rft.au=Escobedo%2C+Juan%3BCerreta%2C+Ellen%3BDennis-Koller%2C+Darcie%3BTrujillo%2C+Carl%3BBronkhorst%2C+Curt&rft.aulast=Escobedo&rft.aufirst=Juan&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Particle size; Historical account; Conferences; Aluminum; Stress; Velocity; Copper; Grains; Technology ER - TY - JOUR T1 - Influence of Interstitial Content and Stress State of the Shock-Induced Phase Transitions in Zr, Ti, and Fe AN - 1372610142; 18029272 AB - Dynamic and shock loading of materials is well known to induce a range of defects in metals and alloys, including dislocations, deformation twins, point defects, as well as shock-induced phase transitions in many select metals and alloys. In this paper, examples of the role of chemistry and stress state on transitions in Zr, Ti, and Fe will be discussed. Observations of the influence of interstitial content on the kinetics of the alpha-omega transition in Zr will be detailed including the results of diamond cell, gas gun, and Z-machine shock data. The alpha-omega transition in Zr is shown to strongly depend on interstitial oxygen content as well as differ significantly between diamond cell, shock loading, and ramp loading. Recent results of the effect of 1-D versus sweeping-detonation wave loading on the alpha-epsilon transition and substructure evolution in Fe will be presented. JF - AIP Conference Proceedings AU - Gray, George AU - Cerreta, Ellen AU - Hull, Larry AU - Rigg, Paulo AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Metals KW - Oxygen KW - Conferences KW - Kinetics KW - Stress KW - Alloys KW - Deformation KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372610142?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Influence+of+Interstitial+Content+and+Stress+State+of+the+Shock-Induced+Phase+Transitions+in+Zr%2C+Ti%2C+and+Fe&rft.au=Gray%2C+George%3BCerreta%2C+Ellen%3BHull%2C+Larry%3BRigg%2C+Paulo&rft.aulast=Gray&rft.aufirst=George&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Oxygen; Metals; Conferences; Kinetics; Alloys; Stress; Technology; Deformation ER - TY - JOUR T1 - Isolating the Influence of Kinetic and Spatial Effects on Dynamic Damage Evolution in OFHC Cu AN - 1372610021; 18028873 AB - The need to control material performance in extreme environments is the motivation for this study to examine the separate effects of kinetics (in the form of high strain rate dynamic loading rate) from that of spatial effects (in the form of microstructural defect distributions). Plate impact experiments are design and executed to produce a state of insipient spall in OFHC Cu samples of well-characterized microstructures. Post experiment soft recovery and metallurgical analysis correlates loading conditions, microstructure, and resultant damage effects. This provides a link between in situ mesoscale effects and continuum level measurements for process aware material models. Experimental results will be presented as well as a description of length scale and kinetic processes as a function of loading condition. JF - AIP Conference Proceedings AU - Dennis-Koller, Darcie AU - Escobedo-Diaz, Pablo AU - Cerreta, Ellen AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Spatial distribution KW - Conferences KW - Kinetics KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372610021?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Isolating+the+Influence+of+Kinetic+and+Spatial+Effects+on+Dynamic+Damage+Evolution+in+OFHC+Cu&rft.au=Dennis-Koller%2C+Darcie%3BEscobedo-Diaz%2C+Pablo%3BCerreta%2C+Ellen&rft.aulast=Dennis-Koller&rft.aufirst=Darcie&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Conferences; Spatial distribution; Kinetics; Technology ER - TY - JOUR T1 - Mechanical Properties and Constitutive Modeling of Metals under Shock Deformation AN - 1372609930; 18028876 AB - Metals under shock loading conditions exhibit enhanced hardening in some cases, no apparent enhanced hardening in others, and with softening for those undergo phase transformation. In this talk examples will be presented to illustrate the shock effect on mechanical properties. Advanced constitutive model will be modified to include the shock effect. *Work support by the US Department of Energy. JF - AIP Conference Proceedings AU - Chen, Shuh Rong AU - Gray, Geroge AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Metals KW - Conferences KW - Deformation KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372609930?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Mechanical+Properties+and+Constitutive+Modeling+of+Metals+under+Shock+Deformation&rft.au=Chen%2C+Shuh+Rong%3BGray%2C+Geroge&rft.aulast=Chen&rft.aufirst=Shuh&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Metals; Conferences; Technology; Deformation ER - TY - JOUR T1 - Mechanical Stress Measurements in Cu Through-Silicon Via (TSV) Using Synchrotron X-Ray Microdiffraction for 3-D Integration AN - 1372609800; 18027996 AB - One key to enable the successful implementation of 3-D interconnects using Through-Silicon Via (TSV) is the control of the mechanical stresses. The synchrotron-sourced X-ray microdiffraction technique has been recognized to allow some important advantages compared to other techniques, namely stress measurement of individual Cu TSV as well as the silicon substrate surrounding it simultaneously at the submicron resolution, stress measurement in situ during annealing and while Cu TSV is still buried under the silicon substrate (mimicking the conditions of real device). Using this approach, we have studied Cu TSV samples from Hynix, Inc. as well as from SEMATECH and found interesting differences in the stress states of the Cu TSV. We studied the stress evolution throughout its thermal history, and proposed an explanation of the observed differences. This understanding could lead to improved stress control in Cu TSV as well as to reduce the impact to the silicon electron mobility. JF - AIP Conference Proceedings AU - Budiman, Arief AU - Shin, H A-S AU - Kim, B-J AU - Hwang, S-H AU - Son, H-Y AU - Suh, M-S AU - Chung, Q-H AU - Byun, K-Y AU - Joo, Y-C AU - Caramto, R AU - Smith, L AU - Kunz, M AU - Tamura, N AD - Los Alamos National Laboratory (LANL) Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Historical account KW - Silicon KW - Mobility KW - Conferences KW - Stress KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372609800?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Mechanical+Stress+Measurements+in+Cu+Through-Silicon+Via+%28TSV%29+Using+Synchrotron+X-Ray+Microdiffraction+for+3-D+Integration&rft.au=Budiman%2C+Arief%3BShin%2C+H+A-S%3BKim%2C+B-J%3BHwang%2C+S-H%3BSon%2C+H-Y%3BSuh%2C+M-S%3BChung%2C+Q-H%3BByun%2C+K-Y%3BJoo%2C+Y-C%3BCaramto%2C+R%3BSmith%2C+L%3BKunz%2C+M%3BTamura%2C+N&rft.aulast=Budiman&rft.aufirst=Arief&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Historical account; Silicon; Conferences; Mobility; Stress; Technology ER - TY - JOUR T1 - Microstructure and Mechanical Properties of Proton Irradiated Titanium Aluminides AN - 1372609779; 18028870 AB - Titanium aluminide is being considered as innovative structural materials for its potential application in advanced nuclear energy system. Ensuring adequate mechanical properties and dimensional stability under radiation is a key part in practical application. However, there is very limited radiation response data for titanium aluminides available. In the present study, we report on microstructure and mechanical properties of titanium aluminides, following irradiation with 1.3 MeV proton at room temperature to a dose of 1.5 dpa. The materials of interest in this presentation are Ti-48Al-2Nb-2Cr and Ti-43.5Al-4Nb-3Mn, both of them in the duplex and fully lamellar microstructures. The radiation induced damage microstructure is examined using transmission electron microscopy (TEM). The mechanical properties (Young's modulus and hardness) of these irradiated samples are determined by cross-sectional nano-indentation measurements as a function of ion penetration depth. Related to their different microstructure and composition, the different radiation response of these materials will also be discussed. JF - AIP Conference Proceedings AU - Tang, Ming AU - Kim, Yong-Won AU - Wang, Yongqiang AU - Maloy, Stuart AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Titanium base alloys KW - Ti-48Al-2Nb-2Cr KW - Titanium KW - Conferences KW - Irradiation KW - Microscopy KW - Temperature KW - Nuclear energy KW - Innovations KW - Technology KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372609779?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Microstructure+and+Mechanical+Properties+of+Proton+Irradiated+Titanium+Aluminides&rft.au=Tang%2C+Ming%3BKim%2C+Yong-Won%3BWang%2C+Yongqiang%3BMaloy%2C+Stuart&rft.aulast=Tang&rft.aufirst=Ming&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Titanium; Conferences; Irradiation; Microscopy; Temperature; Nuclear energy; Technology; Innovations ER - TY - JOUR T1 - Plasticity in Al/Nb Nanoscale Multilayered Materials: Effects of Interface Shear Strength AN - 1372609727; 18029688 AB - Microcompression tests were performed on the nanoscale Al-Nb multilayers with bi-layer thicknesses of 5nm and 50nm. The Al-Nb multilayers showed increase in strength as the bi-layer thickness was reduced; the average 5% flow stress of the 5nm and 50nm specimens were determined to be 2.1GPa and 1.4GPa, respectively. Comparison with the previous report on nanoscale Cu-Nb multilayers indicates that Al-Nb nanolayers have lower flow stress. Al-Nb with negative heat of mixing has higher degree of intermixing and thus would likely have a "stronger interface in shear" that would result in lower barrier to slip transmission as compared to Cu-Nb which interface is weak in shear and thus is a strong trap for glide dislocations via core spreading in the interface plane. This could lead to easier transmission of dislocations across the interface and therefore lower flow stresses for Al-Nb when compared to the case for the Cu-Nb multilayers. JF - AIP Conference Proceedings AU - Budiman, Arief AU - Kim, Youbin AU - Baldwin, Kevin AU - Mara, Nathan AU - Misra, Amit AU - Han, Seungmin AD - Los Alamos National Laboratory (LANL) Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Conferences KW - Stress KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372609727?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Plasticity+in+Al%2FNb+Nanoscale+Multilayered+Materials%3A+Effects+of+Interface+Shear+Strength&rft.au=Budiman%2C+Arief%3BKim%2C+Youbin%3BBaldwin%2C+Kevin%3BMara%2C+Nathan%3BMisra%2C+Amit%3BHan%2C+Seungmin&rft.aulast=Budiman&rft.aufirst=Arief&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Conferences; Stress; Technology ER - TY - JOUR T1 - Rate Sensitivity in Irradiated HT-9 for Reactor Applications AN - 1372609639; 18028865 AB - The Fuel Cycle Research and Development program is investigating methods of burning minor actinides in a transmutation fuel through various fuel cycle options. To achieve this goal, the fast reactor core materials (cladding and duct) must be able to withstand very high doses (>200 dpa) while in contact with the coolant and the fuel. In order to develop physicsbased models of cladding materials for fast reactor applications, more specific testing is required in addition to typical tensile testing. Analysis of a duct made of HT-9 after irradiation to a total dose of 155 dpa at temperatures from 370 to 510 degree C is almost complete including tensile, charpy impact and fracture toughness testing. Specific rate jump tests are underway to investigate rate sensitivity before and after irradiation. Detailed microstructural analysis has also been performed with TEM. A summary of rate sensitivity will be presented in connection with detailed analysis of controlling defects. JF - AIP Conference Proceedings AU - Maloy, Stuart AU - Saleh, Tarik AU - Romero, Tobias AU - Perez-Bergquist, Sara AU - Toloczko, Mychailo AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Sensitivity KW - Conferences KW - Fuels KW - Irradiation KW - Temperature KW - Burning KW - Research programs KW - Actinides KW - Technology KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372609639?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Rate+Sensitivity+in+Irradiated+HT-9+for+Reactor+Applications&rft.au=Maloy%2C+Stuart%3BSaleh%2C+Tarik%3BRomero%2C+Tobias%3BPerez-Bergquist%2C+Sara%3BToloczko%2C+Mychailo&rft.aulast=Maloy&rft.aufirst=Stuart&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Sensitivity; Conferences; Irradiation; Fuels; Temperature; Burning; Research programs; Technology; Actinides ER - TY - JOUR T1 - The Shear Localization Behavior and Mechansims of Five Light Metals Al 7039, Al 5083, Al 5059, AZ31B, and AM60 AN - 1372609320; 18027821 AB - While a great number of studies have examined the uni-axial stress behavior of light metals under quasi-static loading conditions, less is known about the dynamic response and particularly the shear failure mechanisms, of these same metals. For this reason, the forced shear response of five light metals has been examined as a function of temperature, texture, and strain rate. Specimens of Al 7039, Al 5083, Al 5059, AZ31B, and AM60, have been characterized prior to deformation. Then post mortem characterization of these specimens, using optical microscopy, scanning electron microscopy, electron back scattered diffraction, and transmission electron microscopy, has been utilized to correlate the observed mechanical response to the microstructural evolution during loading that leads to damage and failure of these materials. JF - AIP Conference Proceedings AU - Perez-Bergquist, Sara AU - Gray, George AU - Cerreta, Ellen AU - Trujillo, Carl AU - Lopez, Mike AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Aluminum base alloys KW - Magnesium base alloys KW - 5059 KW - 5083 KW - 7039 KW - AM60 KW - AZ31B KW - Metals KW - Behavior KW - Conferences KW - Microscopy KW - Temperature KW - Stress KW - Deformation KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372609320?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=The+Shear+Localization+Behavior+and+Mechansims+of+Five+Light+Metals+Al+7039%2C+Al+5083%2C+Al+5059%2C+AZ31B%2C+and+AM60&rft.au=Perez-Bergquist%2C+Sara%3BGray%2C+George%3BCerreta%2C+Ellen%3BTrujillo%2C+Carl%3BLopez%2C+Mike&rft.aulast=Perez-Bergquist&rft.aufirst=Sara&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Metals; Conferences; Behavior; Microscopy; Temperature; Stress; Technology; Deformation ER - TY - JOUR T1 - Exploiting the Atomic Structure of Interfaces in Crystalline Solids AN - 1372608674; 18028417 AB - The atomic structure of interfaces defines their properties and thereby the properties they impart to polycrystalline and polyphasic materials. This talk focuses primarily on the atomic structures of a few types of interfaces that have been observed in fcc/bcc composites. In spite of the relative simple crystallographic orientations, the differences in lattice parameter of the constituents leads to rather complex structures that are nearly periodic. Misfit dislocations in these structures are discussed and are shown to account for high strength by impeding slip, and to act as potent sinks for Frankel defects. The structure of interfaces is shown to depend on orientation and misfit strain, variables the may be adjusted to alter both mechanical strength and sink strength in controllable ways. This work was supported by Los Alamos National Laboratory Directed Research and Development project ER20110573 and the US Department of Energy, Office of Science, Office of Basic Sciences. JF - AIP Conference Proceedings AU - Hoagland, Richard AU - Wang, Jian AU - Demkowicz, Michael AU - Misra, Amit AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Composite materials KW - Conferences KW - USA, New Mexico, Los Alamos KW - Research programs KW - Technology KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372608674?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Exploiting+the+Atomic+Structure+of+Interfaces+in+Crystalline+Solids&rft.au=Hoagland%2C+Richard%3BWang%2C+Jian%3BDemkowicz%2C+Michael%3BMisra%2C+Amit&rft.aulast=Hoagland&rft.aufirst=Richard&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Composite materials; Conferences; Research programs; Technology; USA, New Mexico, Los Alamos ER - TY - JOUR T1 - Modeling Nickel Surfaces and Grain Boundaries with the Fragment Hamiltonian Model AN - 1372608068; 18026698 AB - Modeling multiple phases, surfaces, and grain boundaries of even an elemental material like nickel within a single atomistic model continues to present challenges. For instance, two separate modified embedded atom method potentials must be invoke to model the pressure and temperature axes of the phase diagrams of iron and zirconium. Here we present a new method of generating atomistic potentials, the Fragment Hamiltonian (FH) model that is aimed at producing a unified model. The FH model holds many similarities to second-moment tight-binding and embedded atom models. In contrast to those two models, the FH model has a second embedding term that contains an effective gap energy that recognizes differences in metallic character among different defects and phases. Both embedding terms contain important coordination dependencies that play an equally important role as the effective gap. Both of these properties are essential for unifying atomistic models. JF - AIP Conference Proceedings AU - Telila, Helen AU - Atlas, Susan AU - Valone, Steven AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Conferences KW - Nickel KW - Temperature KW - Zirconium KW - Grains KW - Iron KW - Technology KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372608068?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Modeling+Nickel+Surfaces+and+Grain+Boundaries+with+the+Fragment+Hamiltonian+Model&rft.au=Telila%2C+Helen%3BAtlas%2C+Susan%3BValone%2C+Steven&rft.aulast=Telila&rft.aufirst=Helen&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Conferences; Nickel; Temperature; Zirconium; Grains; Iron; Technology ER - TY - JOUR T1 - Defect Structures of Interphase Boundaries in Metallic Nano-Composites AN - 1372607523; 18026695 AB - In nano-composites as the length scale of the constituent phases decreases to below approximately 5 nm, the interphase boundaries begin to dominate the mechanical behavior and radiation damage tolerance. It is therefore crucial to understand the atomic arrangements and defect structures of interphase boundaries in nano-composites. This presentation will review several unusual interface structures that were observed in model systems such as V-Ag and Al-TiN using high-resolution transmission electron microscopy. Atomistic modeling has helped elucidate the mechanisms that give rise to unusual interface structures such as Al layers in twin orientation in Al-TiN, and multiple orientation relationships and tetragonal distortions in V-Ag. This research is supported by DOE, Office of Science, Office of Basic Energy Sciences. JF - AIP Conference Proceedings AU - Misra, Amit AU - Wei, Qiangmin AU - Hoagland, Richard AU - Liu, Xiang-Yang AU - Bhattacharyya, Dhriti AD - Los Alamos National Laboratory Y1 - 2012/03/15/ PY - 2012 DA - 2012 Mar 15 PB - American Institute of Physics, Ste. 1NO1 Melville NY 11747-4502 United States SN - 0094-243X, 0094-243X KW - Environment Abstracts KW - Conferences KW - Reviews KW - Microscopy KW - Technology KW - ENA 14:Radiological Contamination UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1372607523?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=AIP+Conference+Proceedings&rft.atitle=Defect+Structures+of+Interphase+Boundaries+in+Metallic+Nano-Composites&rft.au=Misra%2C+Amit%3BWei%2C+Qiangmin%3BHoagland%2C+Richard%3BLiu%2C+Xiang-Yang%3BBhattacharyya%2C+Dhriti&rft.aulast=Misra&rft.aufirst=Amit&rft.date=2012-03-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=AIP+Conference+Proceedings&rft.issn=0094243X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Conferences; Reviews; Microscopy; Technology ER - TY - JOUR T1 - Thermodynamic and Transport Properties of Abundant-Vacancy Pd(1-x)In(1+x) AN - 1372607379; 18027925 AB - Vacancies in metals are stabilized by hydrogen. As a result, vacancy concentrations can be orders of magnitude larger in a H-containing material than the H-free analog. Furthermore, because each vacancy is coordinated by several H atoms, the H-storage capacity of "abundantvacancy" materials can be many times larger than for the vacancy-free analog. This may present an interesting route to development of new hydrogen storage materials. On the other hand, it may have negative consequences for phase and structural stability, particularly for materials experiencing radiation damage in the presence of hydrogen. We have investigated the thermodynamic and transport properties of abundantvacancy Pd(1-x)In(1+x) (-0.02beta -spinel and gamma -spinel-->ferropericlase+perovskite occur. The retrieved conductivity structures beneath the various stations tend to follow trends observed for temperature with the strongest lateral variations in the uppermost mantle; for depths >300 km conductivities appear to depend less on the particular conductivity database. Conductivities at 410 km and at 660 km depth are found to agree overall with purely geophysically-derived global and semi-global one-dimensional conductivity models. Both electrical conductivity databases point to <0.01wt.% H (sub 2) O in the upper mantle. For transition zone minerals results from the laboratory database of Yoshino (2010) suggest that a much higher water content (up to 2wt.% H (sub 2) O) is required than in the other database (Karato, 2011), which favors a relatively "dry" transition zone (<0.01wt.% H (sub 2) O). Incorporating laboratory measurements of hydrous silicate melting relations and available conductivity data allows us to consider the possibility of hydration melting and a high-conductivity melt layer above the 410-km discontinuity. The latter appears to be 1) regionally localized and 2) principally a feature from the Yoshino (2010) database. Further, there is evidence of lateral heterogeneity: The mantle beneath southwestern North America and central China appears "wetter" than that beneath central Europe or Australia. JF - Earth and Planetary Science Letters AU - Khan, A AU - Shankland, T J Y1 - 2012/02// PY - 2012 DA - February 2012 SP - 27 EP - 43 PB - Elsevier, Amsterdam VL - 317-318 SN - 0012-821X, 0012-821X KW - experimental studies KW - electrical conductivity KW - geophysical methods KW - mantle KW - phase transitions KW - inverse problem KW - temperature KW - laboratory studies KW - hydration KW - melting KW - major elements KW - sounding KW - electromagnetic methods KW - water content KW - lateral heterogeneity KW - chemical composition KW - 670-km discontinuity KW - 410-km discontinuity KW - 18:Solid-earth geophysics KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1017950180?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Earth+and+Planetary+Science+Letters&rft.atitle=A+geophysical+perspective+on+mantle+water+content+and+melting%3B+inverting+electromagnetic+sounding+data+using+laboratory-based+electrical+conductivity+profiles&rft.au=Khan%2C+A%3BShankland%2C+T+J&rft.aulast=Khan&rft.aufirst=A&rft.date=2012-02-01&rft.volume=317-318&rft.issue=&rft.spage=27&rft.isbn=&rft.btitle=&rft.title=Earth+and+Planetary+Science+Letters&rft.issn=0012821X&rft_id=info:doi/10.1016%2Fj.epsl.2011.11.031 L2 - http://www.sciencedirect.com/science/journal/0012821X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 136 N1 - Document feature - illus. incl. 10 tables N1 - Last updated - 2012-06-07 N1 - CODEN - EPSLA2 N1 - SubjectsTermNotLitGenreText - 410-km discontinuity; 670-km discontinuity; chemical composition; electrical conductivity; electromagnetic methods; experimental studies; geophysical methods; hydration; inverse problem; laboratory studies; lateral heterogeneity; major elements; mantle; melting; phase transitions; sounding; temperature; water content DO - http://dx.doi.org/10.1016/j.epsl.2011.11.031 ER - TY - JOUR T1 - Identification of sorption processes and parameters for radionuclide transport in fractured rock AN - 920803683; 16166011 AB - Identification of chemical reaction processes in subsurface environments is a key issue for reactive transport modeling because simulating different processes requires developing different chemical-mathematical models. In this paper, two sorption processes (equilibrium and kinetics) are considered for modeling neptunium and uranium sorption in fractured rock. Based on different conceptualizations of the two processes occurring in fracture and/or matrix media, seven dual-porosity, multi-component reactive transport models are developed. The process models are identified with a stepwise strategy by using multi-tracer concentration data obtained from a series of transport experiments. In the first step, breakthrough data of a conservative tracer (tritium) obtained from four experiments are used to estimate the flow and non-reactive transport parameters (i.e., mean fluid residence time in fracture, fracture aperture, and matrix tortuosity) common to all the reactive transport models. In the second and third steps, by fixing the common non-reactive flow and transport parameters, the sorption parameters (retardation factor, sorption coefficient, and kinetic rate constant) of each model are estimated using the breakthrough data of reactive tracers, neptunium and uranium, respectively. Based on the inverse modeling results, the seven sorption-process models are discriminated using four model discrimination (or selection) criteria, Akaike information criterion (AIC), modified Akaike information criterion (AICc), Bayesian information criterion (BIC) and Kashyap information criterion (KIC). These criteria suggest the kinetic sorption process for modeling reactive transport of neptunium and uranium transport in both fracture and matrix. This conclusion is confirmed by two chemical criteria, the half reaction time and Damkohler number criterion. JF - Journal of Hydrology (Amsterdam) AU - Dai, Zhenxue AU - Wolfsberg, Andrew AU - Reimus, Paul AU - Deng, Hailin AU - Kwicklis, Edward AU - Ding, Mei AU - Ware, Doug AU - Ye, Ming AD - Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States, daiz@lanl.gov Y1 - 2012/01/11/ PY - 2012 DA - 2012 Jan 11 SP - 220 EP - 230 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 414-415 SN - 0022-1694, 0022-1694 KW - Environment Abstracts; Aqualine Abstracts; Meteorological & Geoastrophysical Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts KW - Residence time KW - Tracers KW - Hydrologic Models KW - Uranium KW - Chemical Reactions KW - Hydrology KW - Geologic Fractures KW - Sorption KW - discrimination KW - Fractures KW - Radionuclide transport KW - Chemical reactions KW - Tritium KW - Kinetics KW - Radioisotopes KW - Neptunium KW - SW 0880:Chemical processes KW - AQ 00006:Sewage KW - Q2 09161:General KW - M2 556.14:Infiltration/Soil Moisture (556.14) KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/920803683?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Hydrology+%28Amsterdam%29&rft.atitle=Identification+of+sorption+processes+and+parameters+for+radionuclide+transport+in+fractured+rock&rft.au=Dai%2C+Zhenxue%3BWolfsberg%2C+Andrew%3BReimus%2C+Paul%3BDeng%2C+Hailin%3BKwicklis%2C+Edward%3BDing%2C+Mei%3BWare%2C+Doug%3BYe%2C+Ming&rft.aulast=Dai&rft.aufirst=Zhenxue&rft.date=2012-01-11&rft.volume=414-415&rft.issue=&rft.spage=220&rft.isbn=&rft.btitle=&rft.title=Journal+of+Hydrology+%28Amsterdam%29&rft.issn=00221694&rft_id=info:doi/10.1016%2Fj.jhydrol.2011.10.035 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Tracers; Sorption; Tritium; Residence time; Chemical reactions; Uranium; Fractures; Hydrology; Neptunium; Radionuclide transport; discrimination; Kinetics; Geologic Fractures; Hydrologic Models; Chemical Reactions; Radioisotopes DO - http://dx.doi.org/10.1016/j.jhydrol.2011.10.035 ER - TY - JOUR T1 - The Brucella TIR-like protein TcpB interacts with the death domain of MyD88 AN - 968177025; 16241182 AB - The pathogen Brucella melitensis secretes a Toll/interleukin-1 receptor (TIR) domain containing protein that abrogates host innate immune responses. In this study, we have characterized the biochemical interactions of Brucella TIR-like protein TcpB with host innate immune adaptor proteins. Using protein-fragment complementation assays based on Gaussia luciferase and green fluorescent protein, we find that TcpB interacts directly with MyD88 and that this interaction is significantly stronger than the interaction of TcpB with TIRAP, the only other adaptor protein that detectably interacts with TcpB. Surprisingly, the TcpB-MyD88 interaction depends on the death domain (DD) of MyD88, and TcpB does not interact with the isolated TIR domain of MyD88. TcpB disrupts MyD88DD-MyD88DD, MyD88DD-MyD88TIR and MyD88DD-MyD88 interactions but not MyD88-MyD88 or MyD88TIR-MyD88TIR interactions. Structural models consistent with these results suggest how TcpB might inhibit TLR signaling by targeting MyD88 via a DD-TIR domain interface. JF - Biochemical and Biophysical Research Communications AU - Chaudhary, Anu AU - Ganguly, Kumkum AU - Cabantous, Stephanie AU - Waldo, Geoffrey S AU - Micheva-Viteva, Sofiya N AU - Nag, Kamalika AU - Hlavacek, William S AU - Tung, Chang-Shung AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, anuc@u.washington.edu Y1 - 2012/01/06/ PY - 2012 DA - 2012 Jan 06 SP - 299 EP - 304 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 417 IS - 1 SN - 0006-291X, 0006-291X KW - Microbiology Abstracts B: Bacteriology KW - Gaussia KW - adaptor proteins KW - MyD88 protein KW - Brucella melitensis KW - Interleukin 1 KW - Green fluorescent protein KW - Immune response KW - Pathogens KW - Models KW - J 02350:Immunology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/968177025?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Biochemical+and+Biophysical+Research+Communications&rft.atitle=The+Brucella+TIR-like+protein+TcpB+interacts+with+the+death+domain+of+MyD88&rft.au=Chaudhary%2C+Anu%3BGanguly%2C+Kumkum%3BCabantous%2C+Stephanie%3BWaldo%2C+Geoffrey+S%3BMicheva-Viteva%2C+Sofiya+N%3BNag%2C+Kamalika%3BHlavacek%2C+William+S%3BTung%2C+Chang-Shung&rft.aulast=Chaudhary&rft.aufirst=Anu&rft.date=2012-01-06&rft.volume=417&rft.issue=1&rft.spage=299&rft.isbn=&rft.btitle=&rft.title=Biochemical+and+Biophysical+Research+Communications&rft.issn=0006291X&rft_id=info:doi/10.1016%2Fj.bbrc.2011.11.104 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-04-01 N1 - Last updated - 2012-04-06 N1 - SubjectsTermNotLitGenreText - adaptor proteins; MyD88 protein; Interleukin 1; Green fluorescent protein; Pathogens; Immune response; Models; Gaussia; Brucella melitensis DO - http://dx.doi.org/10.1016/j.bbrc.2011.11.104 ER - TY - JOUR T1 - Approximate Solution and Application of the Survival Probability Diffusion Equation AN - 968167788; 16414749 AB - While stochastic neutron transport theories have been developed in rigorous detail, many applications have historically been investigated using the point-kinetics formulation. In this work we develop a space-dependent model using the diffusion approximation to the Pal-Bell probability generating function equation, resulting in a nonlinear analog of the conventional time-dependent neutron diffusion equation. We investigate a variety of approximate solutions for the time- and space-dependent survival probability in one-dimensional symmetric, one-speed, isotropic, delayed neutron precursor-free systems, and compare them to counterpart point-kinetics results. Following the theoretical developments, we apply the new results in the context of a criticality accident scenario, from which the importance of spatial effects is revealed. JF - Nuclear Science and Engineering AU - Ramsey, Scott D AU - Hutchens, Gregory J AD - Los Alamos National Laboratory, X-Computational Physics Division MS F644, Los Alamos, New Mexico 87545, ramsey@lanl.gov Y1 - 2012/01// PY - 2012 DA - Jan 2012 SP - 1 EP - 15 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 170 IS - 1 SN - 0029-5639, 0029-5639 KW - Health & Safety Science Abstracts KW - Historical account KW - spatial distribution KW - Accidents KW - Occupational safety KW - Diffusion KW - survival KW - H 2000:Transportation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/968167788?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthsafetyabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Approximate+Solution+and+Application+of+the+Survival+Probability+Diffusion+Equation&rft.au=Ramsey%2C+Scott+D%3BHutchens%2C+Gregory+J&rft.aulast=Ramsey&rft.aufirst=Scott&rft.date=2012-01-01&rft.volume=170&rft.issue=1&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-04-01 N1 - Number of references - 39 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - spatial distribution; Historical account; Accidents; Occupational safety; Diffusion; survival ER - TY - JOUR T1 - Discovery of DNA operators for TetR and MarR family transcription factors from Burkholderia xenovorans AN - 968167594; 16342765 AB - Determining transcription factor (TF) recognition motifs or operator sites is central to understanding gene regulation, yet few operators have been characterized. In this study, we used a protein-binding microarray (PBM) to discover the DNA recognition sites and putative regulons for three TetR and one MarR family TFs derived from Burkholderia xenovorans, which are common to the genus BURKHOLDERIA: We also describe the development and application of a more streamlined version of the PBM technology that significantly reduced the experimental time. Despite the genus containing many pathogenically important species, only a handful of TF operator sites have been experimentally characterized for Burkholderia to date. Our study provides a significant addition to this knowledge base and illustrates some general challenges of discovering operators on a large scale for prokaryotes. JF - Microbiology AU - Maity, Tuhin Subhra AU - Close, Devin W AU - Valdez, Yolanda E AU - Nowak-Lovato, Kristy AU - Marti-Arbona, Ricardo AU - Nguyen, Tinh T AU - Unkefer, Pat J AU - Hong-Geller, Elizabeth AU - Bradbury, Andrew RM AU - Dunbar, John AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Y1 - 2012 PY - 2012 DA - 2012 SP - 571 EP - 582 PB - Society for General Microbiology, Marlborough House, Basingstoke Road Reading RG7 1AG United Kingdom VL - 158 SN - 1350-0872, 1350-0872 KW - Biochemistry Abstracts 2: Nucleic Acids; Microbiology Abstracts B: Bacteriology; ASFA 1: Biological Sciences & Living Resources KW - Operators KW - Transcription factors KW - Gene regulation KW - Microbiology KW - DNA KW - Transcription KW - Prokaryotes KW - Burkholderia KW - DNA microarrays KW - J 02310:Genetics & Taxonomy KW - Q1 08484:Species interactions: parasites and diseases KW - N 14810:Methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/968167594?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Microbiology&rft.atitle=Discovery+of+DNA+operators+for+TetR+and+MarR+family+transcription+factors+from+Burkholderia+xenovorans&rft.au=Maity%2C+Tuhin+Subhra%3BClose%2C+Devin+W%3BValdez%2C+Yolanda+E%3BNowak-Lovato%2C+Kristy%3BMarti-Arbona%2C+Ricardo%3BNguyen%2C+Tinh+T%3BUnkefer%2C+Pat+J%3BHong-Geller%2C+Elizabeth%3BBradbury%2C+Andrew+RM%3BDunbar%2C+John&rft.aulast=Maity&rft.aufirst=Tuhin&rft.date=2012-01-01&rft.volume=158&rft.issue=&rft.spage=571&rft.isbn=&rft.btitle=&rft.title=Microbiology&rft.issn=13500872&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-04-01 N1 - Last updated - 2014-09-18 N1 - SubjectsTermNotLitGenreText - Microbiology; DNA; Transcription; Operators; Gene regulation; Transcription factors; Prokaryotes; DNA microarrays; Burkholderia ER - TY - JOUR T1 - Importance of colonization and competition in forest landscape response to global climatic change AN - 926887526; 16343665 AB - The tree species composition of a forested landscape may respond to climate change through two primary successional mechanisms: (1) colonization of suitable habitats and (2) competitive dynamics of established species. In this study, we assessed the relative importance of competition and colonization in forest landscape response (as measured by the forest type composition change) to global climatic change. Specifically, we simulated shifts in forest composition within the Boundary Waters Canoe Area of northern Minnesota during the period 2000-2400 AD. We coupled a forest ecosystem process model, PnET-II, and a spatially dynamic forest landscape model, LANDIS-II, to simulate landscape change. The relative ability of 13 tree species to colonize suitable habitat was represented by the probability of establishment or recruitment. The relative competitive ability was represented by the aboveground net primary production. Both competitive and colonization abilities changed over time in response to climatic change. Our results showed that, given only moderate-frequent windthrow (rotation period = 500 years) and fire disturbances (rotation period = 300 years), competition is relatively more important for the short-term (100 years), colonization became relatively more important. However, if more frequent fire disturbances were simulated, then colonization is the dominant process from the beginning of the simulations. Our results suggest that the disturbance regime will affect the relative strengths of successional drivers, the understanding of which is critical for future prediction of forest landscape response to global climatic change. JF - Climatic Change AU - Xu, Chonggang AU - Gertner, George Z AU - Scheller, Robert M AD - Division of Earth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, NM, 87544, USA, gertner@illinois.edu Y1 - 2012/01// PY - 2012 DA - Jan 2012 SP - 53 EP - 83 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 110 IS - 1-2 SN - 0165-0009, 0165-0009 KW - Sustainability Science Abstracts; Meteorological & Geoastrophysical Abstracts KW - Fires KW - Forest ecosystems KW - Trees KW - Landscape KW - Climate change KW - Forests KW - Simulation KW - Habitat KW - Primary production KW - USA, Minnesota KW - colonization KW - Climatic change forecasting KW - Numerical simulations KW - Forest composition KW - competition KW - Topography KW - M2 551.583:Variations (551.583) KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/926887526?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Climatic+Change&rft.atitle=Importance+of+colonization+and+competition+in+forest+landscape+response+to+global+climatic+change&rft.au=Xu%2C+Chonggang%3BGertner%2C+George+Z%3BScheller%2C+Robert+M&rft.aulast=Xu&rft.aufirst=Chonggang&rft.date=2012-01-01&rft.volume=110&rft.issue=1-2&rft.spage=53&rft.isbn=&rft.btitle=&rft.title=Climatic+Change&rft.issn=01650009&rft_id=info:doi/10.1007%2Fs10584-011-0098-5 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-03-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Climatic change forecasting; Fires; Forest ecosystems; Numerical simulations; Climate change; Primary production; Forest composition; Topography; Trees; Landscape; Simulation; Forests; Habitat; colonization; competition; USA, Minnesota DO - http://dx.doi.org/10.1007/s10584-011-0098-5 ER - TY - JOUR T1 - Vibroacoustography Imaging of Kidney Stones In Vitro AN - 920794246; 16169150 AB - Vibroacoustography (VA) is an ultrasound-based modality sensitive to stiffness and free from speckle and possesses some advantages over conventional ultrasound imaging in terms of image quality. The primary objective here is to show its feasibility in detecting/imaging kidney stones (KSs) in vitro . In VA, two intersecting ultrasound beams driven at two different frequencies f 1 and f 2 , respectively, are focused within a freshly excised porcine kidney attached to a solid frame with elastic rubber bands, while the amplitude of the acoustic emission pressure field produced at the difference frequency Delta f = [mid] f 1 - f 2 [mid] is detected by a low-frequency hydrophone. The received low-frequency signal is bandpass filtered and amplified, then digitized by a 14-bits/sample digitizer. The data are then recorded on a computer and processed numerically to construct the images. 2-D magnitude VA images are obtained at different depths within the kidney before and after stone implantation, showing kidney features and stones shapes. Experiments conducted in a water tank on a chalk sphere as well as a series of excised kidneys in which stones are artificially embedded show that all the implanted stones are detected at all chosen depths, when compared with an X-ray fluoroscopy taken to be the reference image. The resulting VA images, obtained from a nonionizing type of radiation (i.e., ultrasound waves) as compared to fluoroscopy, are speckle free unlike conventional ultrasound images. The results presented in this preliminary feasibility study show that VA allows imaging KSs in vitro, and provide the impetus to further develop and investigate VA imaging in a clinical setting for in vivo applications. JF - IEEE Transactions on Biomedical Engineering AU - Mitri, Farid G AU - Kinnick, Randall R AD - Los Alamos National Laboratory , Los Alamos, USA Y1 - 2012/01// PY - 2012 DA - Jan 2012 SP - 248 EP - 254 PB - Institute of Electrical and Electronics Engineers, Inc., 345 E. 47th St. NY NY 10017-2394 United States VL - 59 IS - 1 SN - 0018-9294, 0018-9294 KW - Biotechnology and Bioengineering Abstracts KW - Data processing KW - Acoustics KW - Computers KW - Rubber KW - imaging KW - Energy KW - Ionizing radiation KW - Kidney KW - Waves KW - fluoroscopy KW - Lithiasis KW - Pressure KW - Ultrasound KW - W 30905:Medical Applications UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/920794246?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=IEEE+Transactions+on+Biomedical+Engineering&rft.atitle=Vibroacoustography+Imaging+of+Kidney+Stones+In+Vitro&rft.au=Mitri%2C+Farid+G%3BKinnick%2C+Randall+R&rft.aulast=Mitri&rft.aufirst=Farid&rft.date=2012-01-01&rft.volume=59&rft.issue=1&rft.spage=248&rft.isbn=&rft.btitle=&rft.title=IEEE+Transactions+on+Biomedical+Engineering&rft.issn=00189294&rft_id=info:doi/10.1109%2FTBME.2011.2171341 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Data processing; Acoustics; Computers; Rubber; imaging; Ionizing radiation; Energy; Kidney; fluoroscopy; Waves; Lithiasis; Pressure; Ultrasound DO - http://dx.doi.org/10.1109/TBME.2011.2171341 ER - TY - JOUR T1 - Generating candidate networks for optimization: The CO2 capture and storage optimization problem AN - 920792219; 16209160 AB - We develop a new framework for spatially optimizing infrastructure for CO2 capture and storage (CCS). CCS is a complex and challenging problem: domestically deploying CCS at a meaningful scale will require linking hundreds of coal-fired power plants with CO2 sequestration reservoirs through a dedicated and extensive (many tens-of-thousands of miles) CO2 pipeline network. We introduce a unique method for generating a candidate network from scratch, from which the optimization model selects the optimal set of arcs to form the pipeline network. This new generation method can be applied to any network optimization problem including transmission line, roads, and telecommunication applications. We demonstrate the model and candidate network methodology using a real example of capturing CO2 from coal-fired power plants in the US Midwest and storing the CO2 in depleted oil and gas fields. Results illustrate the critical need to balance CCS investments with generating a candidate network of arcs. JF - Computers, Environment and Urban Systems AU - Middleton, Richard S AU - Kuby, Michael J AU - Bielicki, Jeffrey M AD - Earth and Environmental Sciences, Los Alamos National Laboratory, MS D452, Los Alamos, NM 87545, USA, rsm@lanl.gov Y1 - 2012/01// PY - 2012 DA - Jan 2012 SP - 18 EP - 29 PB - Elsevier B.V., P.O. Box 800 Kidlington Oxford OX5 1DX United Kingdom VL - 36 IS - 1 SN - 0198-9715, 0198-9715 KW - Environment Abstracts; Sustainability Science Abstracts KW - CO2 capture and storage (CCS) KW - Carbon sequestration KW - Network optimization KW - Network design KW - SimCCS KW - Infrastructure optimization KW - Storage KW - telecommunications KW - Power plants KW - Coal KW - Pipelines KW - Carbon dioxide KW - Reservoirs KW - infrastructure KW - oil and gas fields KW - M3 1010:Issues in Sustainable Development KW - ENA 05:Environmental Design & Urban Ecology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/920792219?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers%2C+Environment+and+Urban+Systems&rft.atitle=Generating+candidate+networks+for+optimization%3A+The+CO2+capture+and+storage+optimization+problem&rft.au=Middleton%2C+Richard+S%3BKuby%2C+Michael+J%3BBielicki%2C+Jeffrey+M&rft.aulast=Middleton&rft.aufirst=Richard&rft.date=2012-01-01&rft.volume=36&rft.issue=1&rft.spage=18&rft.isbn=&rft.btitle=&rft.title=Computers%2C+Environment+and+Urban+Systems&rft.issn=01989715&rft_id=info:doi/10.1016%2Fj.compenvurbsys.2011.08.002 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-02-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Storage; telecommunications; Power plants; Pipelines; Coal; Carbon dioxide; infrastructure; Reservoirs; oil and gas fields DO - http://dx.doi.org/10.1016/j.compenvurbsys.2011.08.002 ER - TY - JOUR T1 - Ion irradiation temperature effect on HfO sub(2)/MgO multi-layer structures AN - 918062708; 16136511 AB - Properties of nuclear materials may be improved by employing composite materials. However, these properties usually degrade during the operation in a nuclear reactor environment due to radiation damage accumulation. For this study we fabricated a multi-layer structure composed of MgO and HfO sub(2) thin films on a sapphire substrate. This multi-layer structure was designed to mimic a CERCER (ceramic-ceramic) composite fuel form. The goal of this study was to investigate features of radiation damage evolution cause by ion beam irradiation in a wide temperature range. We observed phase transformation in HfO sub(2) from monoclinic to the tetragonal polymorph and no changes in MgO. Formation of thin amorphous regions adjacent to the MgO/HfO sub(2) and HfO sub(2)/sapphire substrate interfaces was identified in both cases. Phase and microstructural changes demonstrated pronounced dependence on irradiation temperature, which we attributed to either enhanced annihilation of irradiation induced point defects or intermixing between the components of our multi-layered structure. JF - Journal of Nuclear Materials AU - Usov, I O AU - Valdez, JA AU - Won, J AU - Devlin, D J AD - Los Alamos National Laboratory, Los Alamos, NM 87545, USA, iusov@lanl.gov Y1 - 2012/01// PY - 2012 DA - Jan 2012 SP - 262 EP - 267 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 420 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Nuclear reactors KW - composite materials KW - Irradiation KW - Radioactive materials KW - Temperature KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/918062708?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Ion+irradiation+temperature+effect+on+HfO+sub%282%29%2FMgO+multi-layer+structures&rft.au=Usov%2C+I+O%3BValdez%2C+JA%3BWon%2C+J%3BDevlin%2C+D+J&rft.aulast=Usov&rft.aufirst=I&rft.date=2012-01-01&rft.volume=420&rft.issue=1-3&rft.spage=262&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2011.09.024 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-01-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - composite materials; Nuclear reactors; Irradiation; Radioactive materials; Temperature DO - http://dx.doi.org/10.1016/j.jnucmat.2011.09.024 ER - TY - JOUR T1 - The effect of variable mantle composition on melt generation and extraction at mid-ocean ridges AN - 1840620511; 2016-094976 JF - Geophysical Research Abstracts AU - Salters, V AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 6494 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - Hf-177/Hf-176 KW - volcanic rocks KW - isotopes KW - igneous rocks KW - mantle KW - stable isotopes KW - melts KW - plutonic rocks KW - hafnium KW - basalts KW - Arctic Ocean KW - rare earths KW - ocean floors KW - chemical composition KW - East Pacific KW - isotope ratios KW - Mid-Arctic Ocean Ridge KW - ultramafics KW - metals KW - Pacific Ocean KW - peridotites KW - neodymium KW - East Pacific Rise KW - mid-ocean ridges KW - 02D:Isotope geochemistry KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1840620511?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=The+effect+of+variable+mantle+composition+on+melt+generation+and+extraction+at+mid-ocean+ridges&rft.au=Salters%2C+V%3BAnonymous&rft.aulast=Salters&rft.aufirst=V&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-6494.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 3 N1 - SuppNotes - Accessed on April 6, 2016 N1 - Last updated - 2016-11-17 N1 - SubjectsTermNotLitGenreText - Arctic Ocean; basalts; chemical composition; East Pacific; East Pacific Rise; hafnium; Hf-177/Hf-176; igneous rocks; isotope ratios; isotopes; mantle; melts; metals; Mid-Arctic Ocean Ridge; mid-ocean ridges; neodymium; ocean floors; Pacific Ocean; peridotites; plutonic rocks; rare earths; stable isotopes; ultramafics; volcanic rocks ER - TY - JOUR T1 - Effects of hydrological inputs on the dynamics of permafrost system formation and degradation AN - 1840619848; 2016-094901 JF - Geophysical Research Abstracts AU - Frampton, A AU - Painter, S L AU - Destouni, G AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 5204-1 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - hydrology KW - permafrost KW - degradation KW - numerical models KW - surface water KW - fluid flow KW - global change KW - climate change KW - temperature KW - ground water KW - hydrologic cycle KW - transport KW - infiltration KW - climate effects KW - water content KW - discharge KW - global warming KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1840619848?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=Effects+of+hydrological+inputs+on+the+dynamics+of+permafrost+system+formation+and+degradation&rft.au=Frampton%2C+A%3BPainter%2C+S+L%3BDestouni%2C+G%3BAnonymous&rft.aulast=Frampton&rft.aufirst=A&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-5204-1.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Last updated - 2016-11-17 N1 - SubjectsTermNotLitGenreText - climate change; climate effects; degradation; discharge; fluid flow; global change; global warming; ground water; hydrologic cycle; hydrology; infiltration; numerical models; permafrost; surface water; temperature; transport; water content ER - TY - JOUR T1 - Modeling aeolian transport in response to succession, disturbance and future climate; dynamic long term risk assessment for contaminant redistribution AN - 1832682132; 768703-9 AB - Aeolian sediment transport is a fundamental process redistributing sediment, nutrients, and contaminants in dryland ecosystems. Over time frames of centuries or longer, horizontal sediment fluxes and associated rates of contaminant transport are likely to be influenced by succession, disturbances, and changes in climate, yet models of horizontal sediment transport that account for these fundamental factors are lacking, precluding in large part accurate assessment of human health risks associated with persistent soil-bound contaminants. We present a simple model based on empirical measurements of horizontal sediment transport (predominantly saltation) to predict potential contaminant transport rates for recently disturbed sites such as a landfill cover. Omnidirectional transport is estimated within vegetation that changes using a simple Markov model that simulates successional trajectory and considers three types of short-term disturbances (surface fire, crown fire, and drought-induced plant mortality) under current and projected climates. The model results highlight that movement of contaminated soil is sensitive to vegetation dynamics and increases substantially (e.g., > fivefold) when disturbance and/or future climate are considered. The time-dependent responses in horizontal sediment fluxes and associated contaminant fluxes were sensitive to variability in the timing of disturbance, with longer intervals between disturbance allowing woody plants to become dominant and crown fire and drought abruptly reducing woody plant cover. Our results, which have direct implications for contaminant transport and landfill management in the specific context of our assessment, also have general relevance because they highlight the need to more fully account for vegetation dynamics, disturbance, and changing climate in aeolian process studies. JF - Aeolian Research AU - Breshears, David D AU - Kirchner, Thomas B AU - Whicker, Jeffrey J AU - Field, Jason P AU - Allen, Craig D Y1 - 2012/01// PY - 2012 DA - January 2012 SP - 445 EP - 457 PB - Elsevier, Amsterdam VL - 3 IS - 4 SN - 1875-9637, 1875-9637 KW - erosion KW - landfills KW - ecosystems KW - vegetation KW - climate change KW - land loss KW - transport KW - sediments KW - soil erosion KW - mobility KW - climate KW - soils KW - risk management KW - sediment transport KW - clastic sediments KW - statistical analysis KW - pollution KW - models KW - soil pollution KW - mathematical methods KW - dust KW - wind transport KW - waste disposal KW - accuracy KW - Markov chain analysis KW - public health KW - 06A:Sedimentary petrology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832682132?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Aeolian+Research&rft.atitle=Modeling+aeolian+transport+in+response+to+succession%2C+disturbance+and+future+climate%3B+dynamic+long+term+risk+assessment+for+contaminant+redistribution&rft.au=Breshears%2C+David+D%3BKirchner%2C+Thomas+B%3BWhicker%2C+Jeffrey+J%3BField%2C+Jason+P%3BAllen%2C+Craig+D&rft.aulast=Breshears&rft.aufirst=David&rft.date=2012-01-01&rft.volume=3&rft.issue=4&rft.spage=445&rft.isbn=&rft.btitle=&rft.title=Aeolian+Research&rft.issn=18759637&rft_id=info:doi/10.1016%2Fj.aeolia.2011.03.012 L2 - http://www.sciencedirect.com/science/journal/18759637 LA - English DB - GeoRef N1 - Conference title - 7th international conference on aeolian research N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Number of references - 70 N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2017-01-24 N1 - SubjectsTermNotLitGenreText - accuracy; clastic sediments; climate; climate change; dust; ecosystems; erosion; land loss; landfills; Markov chain analysis; mathematical methods; mobility; models; pollution; public health; risk management; sediment transport; sediments; soil erosion; soil pollution; soils; statistical analysis; transport; vegetation; waste disposal; wind transport DO - http://dx.doi.org/10.1016/j.aeolia.2011.03.012 ER - TY - JOUR T1 - Seismo-acoustic analysis for series of ammunition demolition explosions at Sayarim, Israel AN - 1832628027; 650136-88 JF - Geophysical Research Abstracts AU - Pinsky, V AU - Gitterman, Y AU - Ben-Horin, Y AU - Arrowsmith, S AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 4242 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - explosions KW - Sayarim Israel KW - elastic waves KW - correlation KW - Israel KW - noise KW - seismicity KW - seismic waves KW - seismic networks KW - Asia KW - Middle East KW - arrays KW - acoustical waves KW - amplitude KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832628027?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=Seismo-acoustic+analysis+for+series+of+ammunition+demolition+explosions+at+Sayarim%2C+Israel&rft.au=Pinsky%2C+V%3BGitterman%2C+Y%3BBen-Horin%2C+Y%3BArrowsmith%2C+S%3BAnonymous&rft.aulast=Pinsky&rft.aufirst=V&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-4242.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. N1 - Last updated - 2017-01-24 N1 - SubjectsTermNotLitGenreText - acoustical waves; amplitude; arrays; Asia; correlation; elastic waves; explosions; Israel; Middle East; noise; Sayarim Israel; seismic networks; seismic waves; seismicity ER - TY - JOUR T1 - Quantifying and relating subsurface and land-surface variability in permafrost environments using surface geophysical and lidar datasets AN - 1832582285; 650152-90 JF - Geophysical Research Abstracts AU - Hubbard, S S AU - Gangodagamage, C AU - Dafflon, B AU - Wainwright, H AU - Ulrich, C AU - Gusmeroli, A AU - Wu, Y AU - Doetsch, J AU - Peterson, J E AU - Wilson, C AU - Tweedie, C AU - Wullschleger, S D AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 5902-3 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - United States KW - tomography KW - terrestrial environment KW - permafrost KW - laser methods KW - moisture KW - ground-penetrating radar KW - characterization KW - ecosystems KW - variations KW - temperature KW - nitrogen KW - cluster analysis KW - spatial variations KW - quantitative analysis KW - carbon KW - electromagnetic methods KW - chemical properties KW - zoning KW - polygons KW - soils KW - high-resolution methods KW - thermal properties KW - statistical analysis KW - geophysical methods KW - radar methods KW - properties KW - resistivity KW - measurement KW - lidar methods KW - cations KW - Alaska KW - glacial geology KW - active layer KW - pore water KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832582285?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=Quantifying+and+relating+subsurface+and+land-surface+variability+in+permafrost+environments+using+surface+geophysical+and+lidar+datasets&rft.au=Hubbard%2C+S+S%3BGangodagamage%2C+C%3BDafflon%2C+B%3BWainwright%2C+H%3BUlrich%2C+C%3BGusmeroli%2C+A%3BWu%2C+Y%3BDoetsch%2C+J%3BPeterson%2C+J+E%3BWilson%2C+C%3BTweedie%2C+C%3BWullschleger%2C+S+D%3BAnonymous&rft.aulast=Hubbard&rft.aufirst=S&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-5902-3.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. N1 - Last updated - 2017-01-24 N1 - SubjectsTermNotLitGenreText - active layer; Alaska; carbon; cations; characterization; chemical properties; cluster analysis; ecosystems; electromagnetic methods; geophysical methods; glacial geology; ground-penetrating radar; high-resolution methods; laser methods; lidar methods; measurement; moisture; nitrogen; permafrost; polygons; pore water; properties; quantitative analysis; radar methods; resistivity; soils; spatial variations; statistical analysis; temperature; terrestrial environment; thermal properties; tomography; United States; variations; zoning ER - TY - JOUR T1 - Application of subspace detector technique on acoustic signals recorded during eruptive activity; Mount Etna lava fountains case of study AN - 1815669650; 2016-073291 JF - Geophysical Research Abstracts AU - Sciotto, M AU - Rowe, C AU - Cannata, A AU - Gresta, S AU - Privitera, E AU - Spina, L AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 5658-1 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - networks KW - methods KW - monitoring KW - Mount Etna KW - Europe KW - Italy KW - Southern Europe KW - signals KW - case studies KW - Sicily Italy KW - detection KW - lava KW - volcanism KW - eruptions KW - volcanoes KW - applications KW - acoustical waves KW - 24:Quaternary geology KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1815669650?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=Application+of+subspace+detector+technique+on+acoustic+signals+recorded+during+eruptive+activity%3B+Mount+Etna+lava+fountains+case+of+study&rft.au=Sciotto%2C+M%3BRowe%2C+C%3BCannata%2C+A%3BGresta%2C+S%3BPrivitera%2C+E%3BSpina%2C+L%3BAnonymous&rft.aulast=Sciotto&rft.aufirst=M&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-5658-1.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Last updated - 2016-09-01 N1 - SubjectsTermNotLitGenreText - acoustical waves; applications; case studies; detection; eruptions; Europe; Italy; lava; methods; monitoring; Mount Etna; networks; Sicily Italy; signals; Southern Europe; volcanism; volcanoes ER - TY - JOUR T1 - Radionuclide transport during glacial cycles; comparison of two different approaches for handling flow transients AN - 1807506577; 2016-065585 JF - Geophysical Research Abstracts AU - Selroos, J O AU - Cheng, H AU - Painter, S AU - Vidstrand, P AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 1665 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - permafrost KW - last glacial maximum KW - Western Europe KW - Quaternary KW - Europe KW - simulation KW - paleoclimatology KW - Holocene KW - ice sheets KW - ground water KW - models KW - Cenozoic KW - Scandinavia KW - glacial geology KW - Sweden KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1807506577?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=Radionuclide+transport+during+glacial+cycles%3B+comparison+of+two+different+approaches+for+handling+flow+transients&rft.au=Selroos%2C+J+O%3BCheng%2C+H%3BPainter%2C+S%3BVidstrand%2C+P%3BAnonymous&rft.aulast=Selroos&rft.aufirst=J&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-1665.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Last updated - 2016-07-29 N1 - SubjectsTermNotLitGenreText - Cenozoic; Europe; glacial geology; ground water; Holocene; ice sheets; last glacial maximum; models; paleoclimatology; permafrost; Quaternary; Scandinavia; simulation; Sweden; Western Europe ER - TY - JOUR T1 - Improving event locations using a global 3D P-velocity model of the Earth's crust and mantle AN - 1793206336; 2016-047890 JF - Geophysical Research Abstracts AU - Ballard, S AU - Begnaud, M L AU - Young, C J AU - Hipp, J R AU - Encarnacao, A V AU - Chael, E P AU - Phillips, W S AU - Steck, L K AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 6817 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - P-waves KW - body waves KW - three-dimensional models KW - statistical analysis KW - mantle KW - elastic waves KW - seismicity KW - traveltime KW - SALSA3D KW - seismic waves KW - earthquakes KW - uncertainty KW - crust KW - covariance analysis KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1793206336?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=Improving+event+locations+using+a+global+3D+P-velocity+model+of+the+Earth%27s+crust+and+mantle&rft.au=Ballard%2C+S%3BBegnaud%2C+M+L%3BYoung%2C+C+J%3BHipp%2C+J+R%3BEncarnacao%2C+A+V%3BChael%2C+E+P%3BPhillips%2C+W+S%3BSteck%2C+L+K%3BAnonymous&rft.aulast=Ballard&rft.aufirst=S&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-6817.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - SuppNotes - Accessed on March 14, 2016 N1 - Last updated - 2016-06-02 N1 - SubjectsTermNotLitGenreText - body waves; covariance analysis; crust; earthquakes; elastic waves; mantle; P-waves; SALSA3D; seismic waves; seismicity; statistical analysis; three-dimensional models; traveltime; uncertainty ER - TY - JOUR T1 - EXPERIMENTS AND NUMERICAL SIMULATIONS OF SINGLE PARTICLE FOREIGN OBJECT DAMAGE-LIKE IMPACTS OF THERMAL BARRIER COATINGS AN - 1671567248; 16918540 AB - Thermal barrier coatings (TBCs) used on the hot section components of many aero-turbines face many compromising conditions in service. Standard TBCs consist of 7 wt% yttria stabilised zirconia applied over an oxidation resistant metallic bond coat with a thermally grown oxide formed at the interface. Foreign object damage (FOD) wherein hard foreign particles, often found in the gas path of operating aero-turbines, are struck by the leading edge of the high-pressure turbine (HPT) blades, is of particular concern. Even single impacts can cause complete spallation of the local TBC. The first known experimental FOD study where the impacting particle size, geometry, and velocity, as well as TBC temperature, are well known at each impact site was made. The experimental impact crater profiles were quantitatively compared with numerical simulations of equivalent impact scenarios. Excellent agreement was found, thereby validating the numerical modelling techniques and parameters. A numerical parameter study of particle and TBC material properties using the model is presented. JF - International Journal of Impact Engineering AU - Crowell, M W AU - Schaedler, T A AU - Hazel, B H AU - Konitzer, D G AU - McMeeking, R M AU - Evans, A G AD - Los Alamos National Laboratory Y1 - 2012 PY - 2012 DA - 2012 SP - 116 EP - 124 PB - Elsevier B.V., 660 White Plains Rd., Floor 2 Tarrytown NY 10591-5153 United States VL - 48 SN - 0734-743X, 0734-743X KW - Mechanical & Transportation Engineering Abstracts (MT); METADEX (MD); Advanced Polymers Abstracts (EP); Environmental Engineering Abstracts (EN); Composites Industry Abstracts (ED); Engineered Materials Abstracts, Ceramics (EC); CSA / ASCE Civil Engineering Abstracts (CE) KW - AERO-ENGINE KW - AEROSPACE APPLICATION KW - BALLISTIC KW - BARRIER COATING KW - COATINGS KW - DAMAGE KW - DEFORMATION KW - DYNAMIC PROPERTIES KW - ENGINEERING CERAMIC KW - FINITE ELEMENT ANALYSIS KW - FOREIGN OBJECT DAMAGE KW - IMPACT KW - IMPACT DAMAGE KW - IMPACT PROPERTIES KW - IMPACT TEST KW - JET ENGINE KW - MATHEMATICAL ANALYSIS KW - MECHANICAL PROPERTIES KW - MODEL KW - MODELLING KW - NUMERICAL ANALYSIS KW - NUMERICAL MODEL KW - PLASTICITY KW - POISSON'S RATIO KW - PROJECTILE KW - SIMULATION KW - SPALLING KW - STRENGTH KW - TECHNICAL KW - THEORY KW - THERMAL BARRIER COATING KW - THERMAL PROTECTION KW - THERMAL PROTECTION SYSTEM KW - TURBINE KW - TURBINE BLADE KW - YIELD STRENGTH KW - YOUNG'S MODULUS KW - YSZ KW - YTTRIA STABILISED ZIRCONIA KW - ZIRCONIA KW - ZIRCONIUM DIOXIDE KW - ZIRCONIUM OXIDE KW - Damage KW - Zirconium dioxide KW - Craters KW - Yttria stabilized zirconia KW - Mathematical models KW - Computer simulation KW - Thermal barrier coatings KW - Oxidation resistance UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671567248?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Journal+of+Impact+Engineering&rft.atitle=EXPERIMENTS+AND+NUMERICAL+SIMULATIONS+OF+SINGLE+PARTICLE+FOREIGN+OBJECT+DAMAGE-LIKE+IMPACTS+OF+THERMAL+BARRIER+COATINGS&rft.au=Crowell%2C+M+W%3BSchaedler%2C+T+A%3BHazel%2C+B+H%3BKonitzer%2C+D+G%3BMcMeeking%2C+R+M%3BEvans%2C+A+G&rft.aulast=Crowell&rft.aufirst=M&rft.date=2012-01-01&rft.volume=48&rft.issue=&rft.spage=116&rft.isbn=&rft.btitle=&rft.title=International+Journal+of+Impact+Engineering&rft.issn=0734743X&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-02-01 N1 - Last updated - 2015-07-01 ER - TY - BOOK T1 - The purple treasures of Guerrero and Veracruz, Mexico AN - 1664433698; 2015-022754 JF - Amethyst; uncommon vintage AU - Wallace, Terry C, Jr AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 PB - Lithographie, Denver, CO SN - 9780983632320 KW - silicates KW - andesites KW - volcanic rocks KW - silica minerals KW - igneous rocks KW - amethyst KW - metasomatism KW - Guerrero gold belt KW - Cenozoic KW - plutonic rocks KW - Veracruz Mexico KW - Guerrero Mexico KW - Piedra Parada Deposit KW - granodiorites KW - metamorphic rocks KW - Las Vigas Deposit KW - framework silicates KW - skarn KW - Sierra Madre Occidental KW - veins KW - Tertiary KW - intrusions KW - dikes KW - Mexico KW - Amatitlan Deposit KW - metasomatic rocks KW - 01B:Mineralogy of silicates KW - 28A:Economic geology, geology of nonmetal deposits UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664433698?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/GeoRef&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=book&rft.jtitle=&rft.atitle=&rft.au=Wallace%2C+Terry+C%2C+Jr%3BAnonymous&rft.aulast=Wallace&rft.aufirst=Terry&rft.date=2012-01-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=9780983632320&rft.btitle=The+purple+treasures+of+Guerrero+and+Veracruz%2C+Mexico&rft.title=The+purple+treasures+of+Guerrero+and+Veracruz%2C+Mexico&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. N1 - Date revised - 2015-01-01 N1 - PubXState - CO N1 - Document feature - illus. incl. sketch map N1 - Last updated - 2015-04-16 ER - TY - BOOK T1 - Using high performance computing for predicting the fate of sequestered CO (sub 2) and EGS performance AN - 1656037572; 2015-016747 JF - 39th course of the International School of Geophysics on Understanding geological systems for geothermal energy AU - Lichtner, Peter C Y1 - 2012 PY - 2012 DA - 2012 PB - Ettore Majorana Foundation and Centre for Scientific Culture, Erice KW - geothermal energy KW - PFLOTRAN KW - carbon sequestration KW - enhanced geothermal systems KW - computer languages KW - data processing KW - carbon dioxide KW - 29A:Economic geology, geology of energy sources KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656037572?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/GeoRef&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=book&rft.jtitle=&rft.atitle=&rft.au=Lichtner%2C+Peter+C&rft.aulast=Lichtner&rft.aufirst=Peter&rft.date=2012-01-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=Using+high+performance+computing+for+predicting+the+fate+of+sequestered+CO+%28sub+2%29+and+EGS+performance&rft.title=Using+high+performance+computing+for+predicting+the+fate+of+sequestered+CO+%28sub+2%29+and+EGS+performance&rft.issn=&rft_id=info:doi/ L2 - http://istituto.ingv.it/l-ingv/convegni-e-seminari/archivio-congressi/convegni-2012/erice-2012/erice2012_abstract_volume.pdf LA - English DB - GeoRef N1 - Conference title - 39th course of the International School of Geophysics on Understanding geological systems for geothermal energy N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. N1 - Date revised - 2015-01-01 N1 - Document feature - illus. N1 - Last updated - 2015-04-16 ER - TY - JOUR T1 - Carbon isotope stratigraphy of the basal Zechstein (Lopingian) strata in northern Poland and its global correlation AN - 1637531526; 2014-100803 AB - The Kupferschiefer (T1) records a period of basin-wide euxinic conditions, and is thus considered an excellent time-marker in the Zechstein (Lopingian) basin. Previous studies indicated that both the Kupferschiefer and Marl Slate and the overlying Zechstein Limestone (magnesian limestone) show remarkable changes in carbon isotopic composition towards higher (super 13) C (sub carb) values. We have examined the Kupferschiefer of the Zdrada IG 8 borehole that has recently been studied in detail by Pasava et al. (2010) aiming to use the carbon isotope data from the basal Zechstein for stratigraphic correlation of the Zechstein basin with the global isotopic curve for Late Permian. The delta (super 13) C values in the Zdrada IG 8 change from +0.7 ppm at the Kupferschiefer base to +5.4 ppm in its middle part, then decrease to +1.7 ppm at the Kupferschiefer top and next rapidly increase to +3.5 ppm (in the lowest part of the Zechstein Limestone) and finally to +5.1 ppm (0.5 m above). This increasing trend continues into the Zechstein Limestone; all subsequent Zechstein marine carbonates show highly positive delta (super 13) C values. The delta (super 13) C curve that best shows the Zechstein base may lie near a sequence boundary in the upper Guadalupian of South China that postdates the mid-Guadalupian extinction, but the early Wuchiapingian conodonts reported from the basal Zechstein deposits elsewhere exclude such an interpretation. The increase recorded in the interval from the Kupferschiefer to the Main Dolomite fits well the increase of the delta (super 13) C values observed after Isotope Event 0 (some 258 Ma) of the isotopic curve for the Late Permian, although the increase in the Zdrada IG 8 is clearly more significant than that of the global delta (super 13) C curve. In turn, the subsequent slight fall that accelerated after Isotope Event 1 fits the more significant fall in the Platy Dolomite. JF - Geological Quarterly AU - Peryt, Tadeusz Marek AU - Durakiewicz, Tomasz AU - Kotarba, Maciej J AU - Oszczepalski, Slawomir AU - Peryt, Danuta Y1 - 2012 PY - 2012 DA - 2012 SP - 285 EP - 298 PB - Polish Geological Institute, Warsaw VL - 56 IS - 2 SN - 1641-7291, 1641-7291 KW - stratigraphy KW - northern Poland KW - oxygen KW - isotopes KW - Paleozoic KW - Kupferschiefer KW - isotope ratios KW - global KW - C-13/C-12 KW - Europe KW - correlation KW - O-18/O-16 KW - Permian KW - stable isotopes KW - Upper Permian KW - Zechstein KW - Poland KW - Central Europe KW - carbon KW - chemostratigraphy KW - Lopingian KW - 12:Stratigraphy KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637531526?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geological+Quarterly&rft.atitle=Carbon+isotope+stratigraphy+of+the+basal+Zechstein+%28Lopingian%29+strata+in+northern+Poland+and+its+global+correlation&rft.au=Peryt%2C+Tadeusz+Marek%3BDurakiewicz%2C+Tomasz%3BKotarba%2C+Maciej+J%3BOszczepalski%2C+Slawomir%3BPeryt%2C+Danuta&rft.aulast=Peryt&rft.aufirst=Tadeusz&rft.date=2012-01-01&rft.volume=56&rft.issue=2&rft.spage=285&rft.isbn=&rft.btitle=&rft.title=Geological+Quarterly&rft.issn=16417291&rft_id=info:doi/10.7306%2Fgq.1022 L2 - https://gq.pgi.gov.pl/gq/issue/archive LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by Panstwowy Instytut Geologiczny, Warsaw, Poland N1 - Date revised - 2014-01-01 N1 - Number of references - 87 N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2014-12-18 N1 - CODEN - KWGEA2 N1 - SubjectsTermNotLitGenreText - C-13/C-12; carbon; Central Europe; chemostratigraphy; correlation; Europe; global; isotope ratios; isotopes; Kupferschiefer; Lopingian; northern Poland; O-18/O-16; oxygen; Paleozoic; Permian; Poland; stable isotopes; stratigraphy; Upper Permian; Zechstein DO - http://dx.doi.org/10.7306/gq.1022 ER - TY - JOUR T1 - Mantle depletion couples Pd and Pb in monosulphide solid solution AN - 1566816103; 2014-077644 AB - Although Cr-diopsides are typically used to characterize the Pb content and isotope composition of the lithospheric mantle, peridotite sulphides have been proposed to (a) dominate the Pb budget of the upper mantle despite their minute modal abundance (0.01%) and (b) prevent this element from becoming incorporated in the Earth's crust due to the assumed high Pb compatibility in monosulphide solid solution (MSS). We present in-situ LA-ICP-MS measurements of platinum-group element (PGE) and Pb abundances from MSS (n = 28) found in 7 off-cratonic Middle Atlas lherzolite xenoliths in order to test these hypotheses. These MSS have correlated, but highly variable PGE and Pb concentrations on cm-scale (Pb = 1) species, however, these different PGE systematics are not affiliated with textural occurrence (interstitial vs inclusions). Residual and melt-like MSS have distinctly different [Os/Pb]N, with the former having lower Pb abundances at a given Os concentration. The whole rock PGE systematics appear to result from mixing of the distinct MSS groups analysed here. Given the well known behaviour of PGE during mantle melting, i.e. the removal of Pt and Pd relative to I-PGE, we may couple Pb to PGE melting theory. In [Pd/Ir]N-[Os/Pb]N space, the residual MSS adhere to the depleted mantle evolution if an MSS/melt Pb partition coefficient of ca. 5000 is assumed. In this scenario, melt-like MSS are also well affiliated with the evolution of the corresponding melts. These observations strongly suggest that Pb in MSS behaves similar to Pd and is overall less compatible than previously thought. Previously determined Cr-diopside U, Th, Nd and Pb abundances and Pb isotopes systematics (206Pb/204Pb >19.6), together with the MSS Pb concentrations allow simple whole rock mass balancing calculations for the Middle Atlas continental mantle root. Using the highest measured Pb abundances from residual and melt-like MSS, an excess of 93% of the Pb budget is hosted in ortho-and particularly clinopyroxene. To eliminate the extremely high clinopyroxene Nd/Pb (25-260) on the whole rock scale, the associated MSS are required to carry 16X higher Pb concentrations than seen in these xenoliths. Alternatively, the clinopyroxene would need approximately 7X higher Pb than found in the most enriched samples. The Pb component hosted in MSS is also insufficient to appreciably affect the Pb isotopes systematics of the whole rock peridotite, even if the least radiogenic 206Pb/204Pb possible (<13) is assigned to the constituent MSS. Our MSS study implies that mantle melting efficiently extracts Pb from the mantle, rendering a high Pb MSS repository with unradiogenic Pb isotopes implausible to cause the Pb deficit, i.e., Pb paradoxes seen in Earth's geochemical reservoirs. JF - Mineralogical Magazine AU - Wittig, Nadine AU - Klemd, Reiner AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 PB - Mineralogical Society, London VL - 76 IS - 6 SN - 0026-461X, 0026-461X KW - palladium KW - metals KW - mantle KW - lead KW - solid solution KW - platinum group KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566816103?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Mantle+depletion+couples+Pd+and+Pb+in+monosulphide+solid+solution&rft.au=Wittig%2C+Nadine%3BKlemd%2C+Reiner%3BAnonymous&rft.aulast=Wittig&rft.aufirst=Nadine&rft.date=2012-01-01&rft.volume=76&rft.issue=6&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/76/6/2504.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2012 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Number of references - 3 N1 - Last updated - 2014-10-16 N1 - SubjectsTermNotLitGenreText - lead; mantle; metals; palladium; platinum group; solid solution ER - TY - JOUR T1 - Recognizing Quaternary period impacts by asteroids and comets and understanding their human population-level effects AN - 1549619827; 2014-058713 AB - There is a growing realization that impacts on the Earth by asteroids and comets represent a significant risk to human society. Nevertheless, science has been slow to recognize that cosmic impact also likely played a substantive role in the past three million years of human biological and sociocultural evolution. Threshold globally catastrophic impacts with an approximate energy release of 106 megatons (Mt), some 50 million times that of the estimated 20 kiloton average for the Hiroshima and Nagasaki atomic weapons, are modeled to occur on average once every million years (+ or -500,000 years). An average between 65-300 cosmic impacts 103 Mt may have occurred somewhere on Earth during the past three million years, along with 2,150-10,000 impacts between 10 and 103 Mt. Although most cosmic impacts would have occurred in the world's oceans or on thick glacial ice, impacts > 103 Mt had the potential to significantly affect human populations regardless of impact location. We discuss the current difficulty of recognizing and validating past Quaternary Period impact events, and explore how impacts of differing magnitude could have affected human populations and might be reflected in the archaeological record. An opportunity exists for archaeologists and kindred historical disciplines to work closely with planetary scientists to more comprehensively document the Quaternary Period impact record and to apply such knowledge to better understand the nature and risks of cosmic impact. JF - International Geological Congress, Abstracts = Congres Geologique International, Resumes AU - Masse, W Bruce AU - Barrientos, Gustavo AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 1753 PB - [International Geological Congress], [location varies] VL - 34 KW - Cenozoic KW - comets KW - Quaternary KW - asteroids KW - natural hazards KW - risk assessment KW - impacts KW - environmental effects KW - human ecology KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549619827?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Geological+Congress%2C+Abstracts+%3D+Congres+Geologique+International%2C+Resumes&rft.atitle=Recognizing+Quaternary+period+impacts+by+asteroids+and+comets+and+understanding+their+human+population-level+effects&rft.au=Masse%2C+W+Bruce%3BBarrientos%2C+Gustavo%3BAnonymous&rft.aulast=Masse&rft.aufirst=W&rft.date=2012-01-01&rft.volume=34&rft.issue=&rft.spage=1753&rft.isbn=&rft.btitle=&rft.title=International+Geological+Congress%2C+Abstracts+%3D+Congres+Geologique+International%2C+Resumes&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - 34th international geological congress N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by International Geological Congress Organizational Committee N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-07-31 N1 - CODEN - IGABBY N1 - SubjectsTermNotLitGenreText - asteroids; Cenozoic; comets; environmental effects; human ecology; impacts; natural hazards; Quaternary; risk assessment ER - TY - BOOK T1 - Mining the Earth's heat; hot dry rock geothermal energy AN - 1542638792; 2014-045513 JF - Mining the Earth's heat; hot dry rock geothermal energy AU - Brown, Donald W AU - Duchane, David V AU - Heiken, Grant H AU - Hriscu, Vivi Thomas Y1 - 2012 PY - 2012 DA - 2012 SP - 657 PB - Springer, Berlin SN - 9783540673163; 9783540689102 KW - United States KW - hydraulic fracturing KW - technology KW - injection KW - geophysical methods KW - Sandoval County New Mexico KW - geothermal engineering KW - exploitation KW - New Mexico KW - hot dry rocks KW - environmental effects KW - geothermal energy KW - geothermal exploration KW - Fenton Hill KW - deep drilling KW - drilling KW - 30:Engineering geology KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542638792?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/GeoRef&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=book&rft.jtitle=&rft.atitle=&rft.au=Brown%2C+Donald+W%3BDuchane%2C+David+V%3BHeiken%2C+Grant+H%3BHriscu%2C+Vivi+Thomas&rft.aulast=Brown&rft.aufirst=Donald&rft.date=2012-01-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=9783540673163&rft.btitle=Mining+the+Earth%27s+heat%3B+hot+dry+rock+geothermal+energy&rft.title=Mining+the+Earth%27s+heat%3B+hot+dry+rock+geothermal+energy&rft.issn=&rft_id=info:doi/10.1007%2F978-3-540-68910-2 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe, Hanover, Germany N1 - Date revised - 2014-01-01 N1 - Document feature - illus. N1 - Last updated - 2014-07-04 DO - http://dx.doi.org/10.1007/978-3-540-68910-2 ER - TY - JOUR T1 - C, N, O abundances and isotopic compositions in the Sun AN - 1492584225; 2014-005358 AB - For most elements, their solar ( identical with cosmic) abundance and primordial isotopic composition have historically been determined via precise laboratory measurements of primitive meteorites. However, this approach is not possible for highly volatile elements which are strongly depleted, relative to the solar photosphere, even in CI chondrites. Similarly, isotopic compositions, especially for N and O, are so variable among planetary bodies and components of meteorites that distinguishing an average starting composition for the solar nebula was impossible prior to the Genesis mission [1]. By analyzing solar wind (SW) captured in high purity targets, the Genesis science team established that the nitrogen [2] and oxygen [3] isotopic compositions of the Sun are grossly different than those of Earth and almost all planetary materials of the inner solar system. The mechanisms to establish isotopic fractionations of approximately 40% (N) and approximately 7% (non-mass-dependent for O) from the average solar nebula starting composition are still being investigated and it is interesting to consider the isotopic shifts in the light of elemental depletions in planetary matter. For this and other purposes, it is necessary to know the solar elemental composition of elements heavier than He. Photospheric determinations of the solar abundances of the most significant volatile elements (C, N, O) have recently undergone serious revision downward by factors of 1.7 (O), 1.7 (N) and 1.3 (C), thus reducing the solar "metallicity" from 0.0201 to 0.0134 [4]. While solving some long-standing astronomical problems related to the Sun's composition and age, the new results are at odds with models of the solar interior based on helioseismology [see 4]. This discrepancy remains unresolved. We analyzed Genesis Si and SiC targets to determine the fluences of C, N, and O in captured SW. These data can be related to absolute abundances in the Sun when considered with H fluence and a model of ion fractionation in formation and acceleration of the SW. Fluences of C, N, and O were obtained by back-side depth profiling of passive (Si) collectors that had been mechanically thinned [5]. Even with this approach, background corrections were relatively high: approximately 4% for (super 12) C, approximately 20% for (super 16) O and approximately 6% for (super 14) N. The O fluence can be measured with lower background on the SiC target of the SW Concentrator by utlizing the known concentration factor as a function of radius determined from (super 20) Ne data [6]. Preliminary results for the inter-element ratios C/O and N/O agree within uncertainty with the new photospheric compositions, suggesting that high first ionization potential elements are not fractionated relative to each other and lending confidence to the new photospheric abundances. JF - Mineralogical Magazine AU - Heber, V S AU - Burnett, D S AU - Guan, Y AU - Jurewicz, A J G AU - Smith, S AU - Olinger, C AU - McKeegan, K D AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 1828 PB - Mineralogical Society, London VL - 76 IS - 6 SN - 0026-461X, 0026-461X KW - N-15/N-14 KW - oxygen KW - isotopes KW - isotope ratios KW - C-13/C-12 KW - solar wind KW - O-18/O-16 KW - stable isotopes KW - nitrogen KW - carbon KW - Sun KW - chemical composition KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492584225?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=C%2C+N%2C+O+abundances+and+isotopic+compositions+in+the+Sun&rft.au=Heber%2C+V+S%3BBurnett%2C+D+S%3BGuan%2C+Y%3BJurewicz%2C+A+J+G%3BSmith%2C+S%3BOlinger%2C+C%3BMcKeegan%2C+K+D%3BAnonymous&rft.aulast=Heber&rft.aufirst=V&rft.date=2012-01-01&rft.volume=76&rft.issue=6&rft.spage=1828&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://www.minersoc.org/files/Goldschmidt2012_Conference_Abstracts_H.pdf http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2012 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2014-01-01 N1 - Number of references - 6 N1 - Last updated - 2014-09-18 N1 - CODEN - MNLMBB N1 - SubjectsTermNotLitGenreText - C-13/C-12; carbon; chemical composition; isotope ratios; isotopes; N-15/N-14; nitrogen; O-18/O-16; oxygen; solar wind; stable isotopes; Sun ER - TY - JOUR T1 - Mesoscopic scale analysis of deformation patterns for dynamically triggered slip in sheared granular layers; insights into the granular mechanics of dynamic earthquake triggering via discrete element method numerical simulations AN - 1492583677; 2014-005203 JF - Geophysical Research Abstracts AU - Griffa, M AU - Ferdowsi, B AU - Carmeliet, J AU - Daub, E G AU - Guyer, R A AU - Johnson, P A AU - Marone, C AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 718 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - discrete element analysis KW - shear zones KW - numerical models KW - slip rates KW - elastic waves KW - deformation KW - rock mechanics KW - granular materials KW - seismicity KW - shear KW - vibration KW - seismic waves KW - earthquakes KW - causes KW - faults KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1492583677?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=Mesoscopic+scale+analysis+of+deformation+patterns+for+dynamically+triggered+slip+in+sheared+granular+layers%3B+insights+into+the+granular+mechanics+of+dynamic+earthquake+triggering+via+discrete+element+method+numerical+simulations&rft.au=Griffa%2C+M%3BFerdowsi%2C+B%3BCarmeliet%2C+J%3BDaub%2C+E+G%3BGuyer%2C+R+A%3BJohnson%2C+P+A%3BMarone%2C+C%3BAnonymous&rft.aulast=Griffa&rft.aufirst=M&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-718.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-01-30 N1 - SubjectsTermNotLitGenreText - causes; deformation; discrete element analysis; earthquakes; elastic waves; faults; granular materials; numerical models; rock mechanics; seismic waves; seismicity; shear; shear zones; slip rates; vibration ER - TY - JOUR T1 - Compact remote Raman-LIBS instrument for Mars or Titan AN - 1469622476; 2013-099587 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Wiens, R C AU - Maurice, S AU - Clegg, S AU - Sharma, S AU - Misra, A AU - Bender, S AU - Newell, R AU - Dallmann, N AU - Lanza, N AU - Forni, O AU - Lasue, J AU - Rull, F AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1699 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - silicates KW - icy satellites KW - laser-induced breakdown spectroscopy KW - olivine group KW - Mars KW - gypsum KW - olivine KW - orthosilicates KW - Titan Satellite KW - satellites KW - light elements KW - ChemCam instrument KW - chemical analysis KW - sulfates KW - emission spectroscopy KW - terrestrial planets KW - nesosilicates KW - Raman spectroscopy KW - planets KW - organic compounds KW - Mars Science Laboratory KW - Chemistry and Camera instrument KW - spectroscopy KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469622476?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Compact+remote+Raman-LIBS+instrument+for+Mars+or+Titan&rft.au=Wiens%2C+R+C%3BMaurice%2C+S%3BClegg%2C+S%3BSharma%2C+S%3BMisra%2C+A%3BBender%2C+S%3BNewell%2C+R%3BDallmann%2C+N%3BLanza%2C+N%3BForni%2C+O%3BLasue%2C+J%3BRull%2C+F%3BAnonymous&rft.aulast=Wiens&rft.aufirst=R&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1699.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 15 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 23, 2012 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - ChemCam instrument; chemical analysis; Chemistry and Camera instrument; emission spectroscopy; gypsum; icy satellites; instruments; laser-induced breakdown spectroscopy; light elements; Mars; Mars Science Laboratory; nesosilicates; olivine; olivine group; organic compounds; orthosilicates; planets; Raman spectroscopy; satellites; silicates; spectroscopy; sulfates; terrestrial planets; Titan Satellite ER - TY - JOUR T1 - Raman and laser-induced breakdown spectroscopy (LIBS) remote geochemical analysis under Venus atmospheric pressure AN - 1469622471; 2013-099592 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Clegg, S M AU - Sharma, S K AU - Misra, A K AU - Dyar, M D AU - Dallmann, N AU - Wiens, R C AU - Vaniman, D T AU - Speicher, E A AU - Smrekar, S E AU - Wang, A AU - Maurice, S AU - Esposito, L AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2105 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - silicates KW - anhydrite KW - laser-induced breakdown spectroscopy KW - silica minerals KW - Venus KW - olivine group KW - labradorite KW - temperature KW - mineral composition KW - olivine KW - orthosilicates KW - framework silicates KW - basaltic composition KW - geochemistry KW - synthetic materials KW - surface properties KW - plagioclase KW - experimental studies KW - chemical analysis KW - sulfates KW - emission spectroscopy KW - terrestrial planets KW - nesosilicates KW - Raman spectroscopy KW - planets KW - natural analogs KW - quartz KW - atmospheric pressure KW - spectroscopy KW - feldspar group KW - instruments KW - high temperature KW - remote sensing KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469622471?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Raman+and+laser-induced+breakdown+spectroscopy+%28LIBS%29+remote+geochemical+analysis+under+Venus+atmospheric+pressure&rft.au=Clegg%2C+S+M%3BSharma%2C+S+K%3BMisra%2C+A+K%3BDyar%2C+M+D%3BDallmann%2C+N%3BWiens%2C+R+C%3BVaniman%2C+D+T%3BSpeicher%2C+E+A%3BSmrekar%2C+S+E%3BWang%2C+A%3BMaurice%2C+S%3BEsposito%2C+L%3BAnonymous&rft.aulast=Clegg&rft.aufirst=S&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2105.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 9 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 23, 2012 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - anhydrite; atmospheric pressure; basaltic composition; chemical analysis; emission spectroscopy; experimental studies; feldspar group; framework silicates; geochemistry; high temperature; instruments; labradorite; laser-induced breakdown spectroscopy; mineral composition; natural analogs; nesosilicates; olivine; olivine group; orthosilicates; plagioclase; planets; quartz; Raman spectroscopy; remote sensing; silica minerals; silicates; spectroscopy; sulfates; surface properties; synthetic materials; temperature; terrestrial planets; Venus ER - TY - JOUR T1 - Application of principal component analysis to NIR spectra of phyllosilicates; a tool for identifying phyllosilicates on Mars AN - 1469622442; 2013-099458 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Rampe, E B AU - Lanza, N L AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2570 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - silicates KW - near-infrared spectra KW - experimental studies KW - CRISM KW - principal components analysis KW - muscovite KW - statistical analysis KW - Mars Reconnaissance Orbiter KW - Mars KW - illite KW - Compact Reconnaissance Imaging Spectrometer for Mars KW - clay minerals KW - terrestrial planets KW - models KW - aqueous alteration KW - planets KW - laboratory studies KW - multivariate analysis KW - mica group KW - identification KW - sheet silicates KW - spectra KW - montmorillonite KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469622442?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Application+of+principal+component+analysis+to+NIR+spectra+of+phyllosilicates%3B+a+tool+for+identifying+phyllosilicates+on+Mars&rft.au=Rampe%2C+E+B%3BLanza%2C+N+L%3BAnonymous&rft.aulast=Rampe&rft.aufirst=E&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2570.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on July 19, 2012 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - aqueous alteration; clay minerals; Compact Reconnaissance Imaging Spectrometer for Mars; CRISM; experimental studies; identification; illite; laboratory studies; Mars; Mars Reconnaissance Orbiter; mica group; models; montmorillonite; multivariate analysis; muscovite; near-infrared spectra; planets; principal components analysis; sheet silicates; silicates; spectra; statistical analysis; terrestrial planets ER - TY - JOUR T1 - A preliminary examination of meteorites with laser-induced breakdown spectroscopy (LIBS) AN - 1469622434; 2013-099591 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Lanza, N L AU - Wiens, R C AU - Newsom, H E AU - McInroy, R E AU - Clegg, S AU - Bender, S C AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2780 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - calcium KW - alkaline earth metals KW - pressure KW - asteroids KW - principal components analysis KW - parent bodies KW - statistical analysis KW - octahedrite KW - low pressure KW - iron KW - emission spectra KW - meteorites KW - iron meteorites KW - titanium KW - metals KW - nickel KW - LIBS spectra KW - spectra KW - Canyon Diablo Meteorite KW - instruments KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469622434?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=A+preliminary+examination+of+meteorites+with+laser-induced+breakdown+spectroscopy+%28LIBS%29&rft.au=Lanza%2C+N+L%3BWiens%2C+R+C%3BNewsom%2C+H+E%3BMcInroy%2C+R+E%3BClegg%2C+S%3BBender%2C+S+C%3BAnonymous&rft.aulast=Lanza&rft.aufirst=N&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2780.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 9 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Aug. 23, 2012 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; asteroids; calcium; Canyon Diablo Meteorite; emission spectra; instruments; iron; iron meteorites; LIBS spectra; low pressure; metals; meteorites; nickel; octahedrite; parent bodies; pressure; principal components analysis; spectra; statistical analysis; titanium ER - TY - JOUR T1 - Hydrothermal flow within Enceladus AN - 1469622329; 2013-099491 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Travis, B J AU - Schubert, G AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2695 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - halides KW - icy satellites KW - calcium chloride KW - radioactive decay KW - freezing KW - simulation KW - temperature KW - dynamics KW - ice KW - heat flow KW - chlorides KW - thickness KW - thermodynamic properties KW - satellites KW - spherical models KW - numerical models KW - convection KW - porosity KW - two-dimensional models KW - hydrothermal conditions KW - planetary interiors KW - brines KW - heat transfer KW - core KW - latitude KW - Enceladus Satellite KW - pore water KW - permeability KW - ice shells KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469622329?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Hydrothermal+flow+within+Enceladus&rft.au=Travis%2C+B+J%3BSchubert%2C+G%3BAnonymous&rft.aulast=Travis&rft.aufirst=B&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2695.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 3 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on July 24, 2012 N1 - Last updated - 2013-12-20 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - brines; calcium chloride; chlorides; convection; core; dynamics; Enceladus Satellite; freezing; halides; heat flow; heat transfer; hydrothermal conditions; ice; ice shells; icy satellites; latitude; numerical models; permeability; planetary interiors; pore water; porosity; radioactive decay; satellites; simulation; spherical models; temperature; thermodynamic properties; thickness; two-dimensional models ER - TY - JOUR T1 - The gap between ice-penetrating radar observations and the boundary conditions used in ice-sheet models AN - 1469619982; 2013-099671 JF - Geophysical Research Abstracts AU - MacGregor, J A AU - Fahnestock, M A AU - Catania, G A AU - Price, S F AU - Paden, J AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - Abstract EGU2012 EP - 1033 PB - Copernicus GmbH on behalf of the European Geosciences Union (EGU), Katlenburg-Lindau VL - 14 SN - 1029-7006, 1029-7006 KW - ground-penetrating radar KW - roughness KW - geophysical methods KW - radar methods KW - glaciers KW - freezing KW - satellite methods KW - thawing KW - ice sheets KW - boundary conditions KW - observations KW - models KW - ice KW - glacial geology KW - remote sensing KW - 24:Quaternary geology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469619982?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Abstracts&rft.atitle=The+gap+between+ice-penetrating+radar+observations+and+the+boundary+conditions+used+in+ice-sheet+models&rft.au=MacGregor%2C+J+A%3BFahnestock%2C+M+A%3BCatania%2C+G+A%3BPrice%2C+S+F%3BPaden%2C+J%3BAnonymous&rft.aulast=MacGregor&rft.aufirst=J&rft.date=2012-01-01&rft.volume=14&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Abstracts&rft.issn=10297006&rft_id=info:doi/ L2 - http://meetingorganizer.copernicus.org/EGU2012/EGU2012-1033.pdf http://www.copernicus.org/EGU/gra/gra.html LA - English DB - GeoRef N1 - Conference title - European Geosciences Union general assembly 2012 N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Last updated - 2013-12-20 N1 - SubjectsTermNotLitGenreText - boundary conditions; freezing; geophysical methods; glacial geology; glaciers; ground-penetrating radar; ice; ice sheets; models; observations; radar methods; remote sensing; roughness; satellite methods; thawing ER - TY - JOUR T1 - On estimating functional average breakthrough curve using time-warping technique and perturbation approach AN - 1434005492; 2013-071643 AB - Simulated contaminant breakthrough curves (BTC) are often used to predict mass arrival at compliance boundaries at waste storage sites. In numerical simulations that involve uncertainties on input parameters such as randomly heterogeneous rock properties, Monte Carlo simulations are commonly utilized and the mean breakthrough curve is often calculated from the arithmetic average of all realizations. The arithmetic mean breakthrough curve in general overestimates the mass flow rate at early and late time but underestimates the peak mass flow rate. The averaged breakthrough curve usually does not resemble any of individual breakthrough curves. The reason is that BTCs vary not only on amplitude but also on dynamics (time) and therefore it is not appropriate to take the arithmetic average directly. In this study, we consider each BTC as a random curve, and use time-warping techniques to align all curves in a time-warped space, compute the sample mean of the curves in the time-warped space, and transform the means back to the original time space. We show that all BTCs are aligned based on the percentile of mass reaching the compliance boundary, and the functional average is the percentile average of all BTCs. The confidence interval of the sample mean curve is estimated using the perturbation approach. The functional average provides an additional metric that can be used to characterize the breakthrough behavior in addition to more traditional median and arithmetic average curves. The method is illustrated using transport simulations at the Material Disposal Area G, Los Alamos National Laboratory (LANL) in New Mexico. JF - Water Resources Research AU - Lu, Zhiming AU - Stauffer, Philip H Y1 - 2012 PY - 2012 DA - 2012 EP - Citation W05541 PB - American Geophysical Union, Washington, DC VL - 48 IS - 5 SN - 0043-1397, 0043-1397 KW - United States KW - hydrology KW - numerical models KW - Monte Carlo analysis KW - statistical analysis KW - data processing KW - waste disposal sites KW - pollution KW - mathematical models KW - New Mexico KW - Los Alamos County New Mexico KW - Los Alamos National Laboratory KW - ground water KW - time-warping method KW - digital simulation KW - breakthrough curves KW - water pollution KW - uncertainty KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1434005492?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=On+estimating+functional+average+breakthrough+curve+using+time-warping+technique+and+perturbation+approach&rft.au=Lu%2C+Zhiming%3BStauffer%2C+Philip+H&rft.aulast=Lu&rft.aufirst=Zhiming&rft.date=2012-01-01&rft.volume=48&rft.issue=5&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1029%2F2011WR011506 L2 - http://www.agu.org/journals/wr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 25 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2013-09-20 N1 - CODEN - WRERAQ N1 - SubjectsTermNotLitGenreText - breakthrough curves; data processing; digital simulation; ground water; hydrology; Los Alamos County New Mexico; Los Alamos National Laboratory; mathematical models; Monte Carlo analysis; New Mexico; numerical models; pollution; statistical analysis; time-warping method; uncertainty; United States; waste disposal sites; water pollution DO - http://dx.doi.org/10.1029/2011WR011506 ER - TY - JOUR T1 - Multi-decadal marine- and land-terminating glacier recession in the Ammassalik region, southeast Greenland AN - 1400620460; 2013-056716 AB - Landsat imagery was applied to elucidate glacier fluctuations of land- and marine-terminating outlet glaciers from the Greenland Ice Sheet (GrIS) and local land-terminating glaciers and ice caps (GIC) peripheral to the GrIS in the Ammassalik region, Southeast Greenland, during the period 1972-2011. Data from 21 marine-terminating glaciers (including the glaciers Helheim, Midgaard, and Fenris), the GrIS land-terminating margin, and 35 GIC were examined and compared to observed atmospheric air temperatures, precipitation, and reconstructed ocean water temperatures (at 400 m depth in the Irminger Sea). Here, we document that net glacier recession has occurred since 1972 in the Ammassalik region for all glacier types and sizes, except for three GIC. The land-terminating GrIS and GIC reflect lower marginal and areal changes than the marine-terminating outlet glaciers. The mean annual land-terminating GrIS and GIC margin recessions were about three to five times lower than the GrIS marine-terminating recession. The marine-terminating outlet glaciers had an average net frontal retreat for 1999-2011 of 0.098 km yr (super -1) , which was significantly higher than in previous sub-periods 1972-1986 and 1986-1999. For the marine-terminating GrIS, the annual areal recession rate has been decreasing since 1972, while increasing for the land-terminating GrIS since 1986. On average for all the observed GIC, a mean net frontal retreat for 1986-2011 of 0.010 + or - 0.006 km yr (super -1) and a mean areal recession of around 1% per year occurred; overall for all observed GIC, a mean recession rate of 27 + or - 24% occurred based on the 1986 GIC area. Since 1986, five GIC melted away in the Ammassalik area. JF - The Cryosphere (Online) AU - Mernild, S H AU - Malmros, J K AU - Yde, J C AU - Knudsen, N T Y1 - 2012 PY - 2012 DA - 2012 SP - 625 EP - 639 PB - Copernicus on behalf of the European Geosciences Union, Katlenburg-Lindau VL - 6 IS - 3 KW - Arctic region KW - Greenland ice sheet KW - ice cover KW - glaciers KW - South Greenland KW - ice sheets KW - deglaciation KW - Ammassalik Greenland KW - southeastern Greenland KW - ice movement KW - Greenland KW - Landsat KW - mass balance KW - glacial geology KW - remote sensing KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1400620460?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Cryosphere+%28Online%29&rft.atitle=Multi-decadal+marine-+and+land-terminating+glacier+recession+in+the+Ammassalik+region%2C+southeast+Greenland&rft.au=Mernild%2C+S+H%3BMalmros%2C+J+K%3BYde%2C+J+C%3BKnudsen%2C+N+T&rft.aulast=Mernild&rft.aufirst=S&rft.date=2012-01-01&rft.volume=6&rft.issue=3&rft.spage=625&rft.isbn=&rft.btitle=&rft.title=The+Cryosphere+%28Online%29&rft.issn=1994-0424&rft_id=info:doi/10.5194%2Ftc-6-625-2012 L2 - http://www.the-cryosphere.net/volumes_and_issues.html LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany N1 - Date revised - 2013-01-01 N1 - Number of references - 44 N1 - Document feature - illus. incl. 4 tables, sketch map N1 - Last updated - 2013-07-18 N1 - SubjectsTermNotLitGenreText - Ammassalik Greenland; Arctic region; deglaciation; glacial geology; glaciers; Greenland; Greenland ice sheet; ice cover; ice movement; ice sheets; Landsat; mass balance; remote sensing; South Greenland; southeastern Greenland DO - http://dx.doi.org/10.5194/tc-6-625-2012 ER - TY - JOUR T1 - Tuning the interactions of PNIPAM gel nanoparticles AN - 1351597234; 2013-041063 AB - The presence of a lower critical solution temperature (LCST) at 33C in PNIPAM gels is well known. Above the LCST the gel in water collapses from a solvent swollen state. Previously, we synthesized and studied the properties of 5 nm PNIPAM gel nanoparticles. The size of these particles allowed us to characterizae the temperature-dependent changes in the particle interactons using light scattering and small-angle neutron scattering (SANS) with the unanticipated result that the interactions go from highly repulsive to attractive as the temperature is increased above the LCST. The magnitude of the repulsive interaction was larger than that anticipated for hard sphere excluded volume effects. With the aim of understanding the interaction potential of these PNIPAM gel nanoparticles and the relation to the LCST, we studied the concentration and temperature-dependent phase map, using SANS to probe the structures of the fluid, crystalline and glassy phases. Concentration is used to explore the distance dependency of the interaction potential, while temperature is used to tune this potential through the repulsive to attractive states. The overall goal of this work is to understand the underlying physics of these and like materials for the development of environmentally responsive systems. JF - Mineralogical Magazine AU - Hjelm, Rex P AU - Arleth, Lise AU - Hu, Zhibing AU - Wu, Jianzhong AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 1847 PB - Mineralogical Society, London VL - 76 IS - 6 SN - 0026-461X, 0026-461X KW - environmental management KW - mitigation KW - solvents KW - volume KW - solutes KW - nanoparticles KW - temperature KW - remediation KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1351597234?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Tuning+the+interactions+of+PNIPAM+gel+nanoparticles&rft.au=Hjelm%2C+Rex+P%3BArleth%2C+Lise%3BHu%2C+Zhibing%3BWu%2C+Jianzhong%3BAnonymous&rft.aulast=Hjelm&rft.aufirst=Rex&rft.date=2012-01-01&rft.volume=76&rft.issue=6&rft.spage=1847&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/76/6/1794.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2012 N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2013-01-01 N1 - Number of references - 1 N1 - Last updated - 2013-05-16 N1 - CODEN - MNLMBB N1 - SubjectsTermNotLitGenreText - environmental management; mitigation; nanoparticles; remediation; solutes; solvents; temperature; volume ER - TY - JOUR T1 - A coarse-grained model for synergistic action of multiple enzymes on cellulose AN - 1328513907; 17391818 AB - Background: Degradation of cellulose to glucose requires the cooperative action of three classes of enzymes, collectively known as cellulases. Endoglucanases randomly bind to cellulose surfaces and generate new chain ends by hydrolyzing [beta]-1,4-D-glycosidic bonds. Exoglucanases bind to free chain ends and hydrolyze glycosidic bonds in a processive manner releasing cellobiose units. Then, [beta]-glucosidases hydrolyze soluble cellobiose to glucose. Optimal synergistic action of these enzymes is essential for efficient digestion of cellulose. Experiments show that as hydrolysis proceeds and the cellulose substrate becomes more heterogeneous, the overall degradation slows down. As catalysis occurs on the surface of crystalline cellulose, several factors affect the overall hydrolysis. Therefore, spatial models of cellulose degradation must capture effects such as enzyme crowding and surface heterogeneity, which have been shown to lead to a reduction in hydrolysis rates. Results: We present a coarse-grained stochastic model for capturing the key events associated with the enzymatic degradation of cellulose at the mesoscopic level. This functional model accounts for the mobility and action of a single cellulase enzyme as well as the synergy of multiple endo- and exo-cellulases on a cellulose surface. The quantitative description of cellulose degradation is calculated on a spatial model by including free and bound states of both endo- and exo-cellulases with explicit reactive surface terms (e.g., hydrogen bond breaking, covalent bond cleavages) and corresponding reaction rates. The dynamical evolution of the system is simulated by including physical interactions between cellulases and cellulose. Conclusions: Our coarse-grained model reproduces the qualitative behavior of endoglucanases and exoglucanases by accounting for the spatial heterogeneity of the cellulose surface as well as other spatial factors such as enzyme crowding. Importantly, it captures the endo-exo synergism of cellulase enzyme cocktails. This model constitutes a critical step towards testing hypotheses and understanding approaches for maximizing synergy and substrate properties with a goal of cost effective enzymatic hydrolysis. JF - Biotechnology for Biofuels AU - Asztalos, Andrea AU - Daniels, Marcus AU - Sethi, Anurag AU - Shen, Tongye AU - Langan, Paul AU - Redondo, Antonio AU - Gnanakaran, Sandrasegaram AD - Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA Y1 - 2012 PY - 2012 DA - 2012 SP - 55 PB - BioMed Central Ltd., Floor 6 London WC1X 8HL United Kingdom VL - 5 IS - 1 SN - 1754-6834, 1754-6834 KW - Biotechnology and Bioengineering Abstracts KW - Cellulose degradation KW - Synergy KW - Exo-cellulase KW - Endo-cellulase KW - Agent-based model KW - Spatial heterogeneity KW - Endoglucanase KW - Mobility KW - cellobiose KW - Crowding KW - Cellulose KW - Glucose KW - Enzymes KW - Hydrolysis KW - Stochasticity KW - Cellulase KW - Digestion KW - Hydrogen bonding KW - Biofuels KW - Evolution KW - Catalysis KW - W 30940:Products UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328513907?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Biotechnology+for+Biofuels&rft.atitle=A+coarse-grained+model+for+synergistic+action+of+multiple+enzymes+on+cellulose&rft.au=Asztalos%2C+Andrea%3BDaniels%2C+Marcus%3BSethi%2C+Anurag%3BShen%2C+Tongye%3BLangan%2C+Paul%3BRedondo%2C+Antonio%3BGnanakaran%2C+Sandrasegaram&rft.aulast=Asztalos&rft.aufirst=Andrea&rft.date=2012-01-01&rft.volume=5&rft.issue=1&rft.spage=55&rft.isbn=&rft.btitle=&rft.title=Biotechnology+for+Biofuels&rft.issn=17546834&rft_id=info:doi/10.1186%2F1754-6834-5-55 L2 - http://www.biotechnologyforbiofuels.com/content/5/1/55 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-04-01 N1 - Number of references - 57 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Endoglucanase; cellobiose; Mobility; Crowding; Cellulose; Glucose; Enzymes; Stochasticity; Hydrolysis; Cellulase; Digestion; Hydrogen bonding; Spatial heterogeneity; Evolution; Biofuels; Catalysis DO - http://dx.doi.org/10.1186/1754-6834-5-55 ER - TY - JOUR T1 - Genetic diversity within the genus Francisella as revealed by comparative analyses of the genomes of two North American isolates from environmental sources AN - 1328509443; 17390724 AB - Background: Francisella tularensis is an intracellular pathogen that causes tularemia in humans and the public health importance of this bacterium has been well documented in recent history. Francisella philomiragia, a distant relative of F. tularensis, is thought to constitute an environmental lineage along with Francisella novicida. Nevertheless, both F. philomiragia and F. novicida have been associated with human disease, primarily in immune-compromised individuals. To understand the genetic relationships and evolutionary contexts among different lineages within the genus Francisella, the genome of Francisella spp. strain TX07-7308 was sequenced and compared to the genomes of F. philomiragia strains ATCC 25017 and 25015, F. novicida strain U112, and F. tularensis strain Schu S4. Results: The size of strain ATCC 25017 chromosome was 2,045,775 bp and contained 1,983 protein-coding genes. The size of strain TX07-7308 chromosome was 2,035,931 bp and contained 1,980 protein-coding genes. Pairwise BLAST comparisons indicated that strains TX07-7308 and ATCC 25017 contained 1,700 protein coding genes in common. NUCmer analyses revealed that the chromosomes of strains TX07-7308 and ATCC 25017 were mostly collinear except for a few gaps, translocations, and/or inversions. Using the genome sequence data and comparative analyses with other members of the genus Francisella (e.g., F. novicida strain U112 and F. tularensis strain Schu S4), several strain-specific genes were identified. Strains TX07-7308 and ATCC 25017 contained an operon with six open reading frames encoding proteins related to enzymes involved in thiamine biosynthesis that was absent in F. novicida strain U112 and F. tularensis strain Schu S4. Strain ATCC 25017 contained an operon putatively involved in lactose metabolism that was absent in strain TX07-7308, F. novicida strain U112, and F. tularensis strain Schu S4. In contrast, strain TX07-7308 contained an operon putatively involved in glucuronate metabolism that was absent in the genomes of strain ATCC 25017, F. novicida strain U112, and F. tularensis strain Schu S4. The polymorphic nature of polysaccharide biosynthesis/modification gene clusters among different Francisella strains was also evident from genome analyses. Conclusions: From genome comparisons, it appeared that genes encoding novel functions have contributed to the metabolic enrichment of the environmental lineages within the genus Francisella. The inability to acquire new genes coupled with the loss of ancestral traits and the consequent reductive evolution may be a cause for, as well as an effect of, niche selection of F. tularensis. Sequencing and comparison of the genomes of more isolates are required to obtain further insights into the ecology and evolution of different species within the genus Francisella. JF - BMC Genomics AU - Siddaramappa, Shivakumara AU - Challacombe, Jean F AU - Petersen, Jeannine M AU - Pillai, Segaran AU - Kuske, Cheryl R AD - Bioscience Division, Los Alamos National Laboratory, Los Alamos, NewMexico, 87545, USA Y1 - 2012 PY - 2012 DA - 2012 SP - 422 PB - BioMed Central Ltd., Middlesex House London W1T 4LB United Kingdom VL - 13 IS - 1 SN - 1471-2164, 1471-2164 KW - Microbiology Abstracts B: Bacteriology; Genetics Abstracts KW - Genomes KW - Niches KW - Nucleotide sequence KW - Genetic diversity KW - Polysaccharides KW - Public health KW - Evolutionary genetics KW - Enrichment KW - Lactose KW - Data processing KW - Thiamine KW - Enzymes KW - Francisella tularensis KW - Pathogens KW - Genetic relationship KW - Tularemia KW - Chromosome translocations KW - Francisella KW - Inversion KW - Francisella novicida KW - Operons KW - Metabolism KW - Evolution KW - Open reading frames KW - J 02400:Human Diseases KW - G 07770:Bacteria UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328509443?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=BMC+Genomics&rft.atitle=Genetic+diversity+within+the+genus+Francisella+as+revealed+by+comparative+analyses+of+the+genomes+of+two+North+American+isolates+from+environmental+sources&rft.au=Siddaramappa%2C+Shivakumara%3BChallacombe%2C+Jean+F%3BPetersen%2C+Jeannine+M%3BPillai%2C+Segaran%3BKuske%2C+Cheryl+R&rft.aulast=Siddaramappa&rft.aufirst=Shivakumara&rft.date=2012-01-01&rft.volume=13&rft.issue=1&rft.spage=422&rft.isbn=&rft.btitle=&rft.title=BMC+Genomics&rft.issn=14712164&rft_id=info:doi/10.1186%2F1471-2164-13-422 L2 - http://www.biomedcentral.com/1471-2164/13/422 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-04-01 N1 - Number of references - 101 N1 - Last updated - 2013-05-17 N1 - SubjectsTermNotLitGenreText - Genomes; Lactose; Data processing; Nucleotide sequence; Niches; Thiamine; Enzymes; Genetic diversity; Pathogens; Polysaccharides; Public health; Genetic relationship; Tularemia; Chromosome translocations; Inversion; Evolutionary genetics; Operons; Enrichment; Open reading frames; Evolution; Metabolism; Francisella; Francisella novicida; Francisella tularensis DO - http://dx.doi.org/10.1186/1471-2164-13-422 ER - TY - JOUR T1 - Inverse modeling of experiments to support more realistic simulations of sorbing radionuclide transport AN - 1328505428; 2013-033347 AB - A series of adsorption, desorption, and column transport experiments were conducted to evaluate the transport of uranium (U) and neptunium (Np) through saturated volcanic tuffs. For potential high-level radioactive waste sites, these experiments demonstrate that slow radionuclide desorption processes, which are typically not accounted for in transport models implementing simple partition coefficients (Kd values), may dominate field-scale transport. A complimentary interpretive numerical model couples a simplified geochemical description of the system with transport calculations where heterogeneities are represented as an ensemble of sorption sites with characteristic adsorption and desorption rate constants that have widely varying values. Adsorption and desorption rate constants were estimated through inverse modeling such that reliable upscaled predictions of reactive transport in field settings could be simulated. The inverse modeling software, PEST, was also used to perform advanced uncer tainty quantification. The multicomponent model/parameters matching the combined data sets suggest that over much longer time and distance scales the transport of U and Np under the experimental conditions would result in very little transport over field scales because even a small number of strong sorption sites will have an exaggerated retarding influence on the transport of a radionuclide plume. Modeling of combined sorption/desorption experiments and column transport experiments that involve both the measurement of column effluent breakthrough curves and the distribution of radionuclides remaining in the column at the conclusion of the experiments holds significant promise for supporting an improved approach to properly account for mineralogical heterogeneity over long time and distance scales in reactive radionuclide transport models. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. JF - International Geological Congress, Abstracts = Congres Geologique International, Resumes AU - James, Scott C AU - Reimus, Paul W AU - Arnold, Bill W AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 3618 PB - [International Geological Congress], [location varies] VL - 34 KW - sorption KW - desorption KW - neptunium KW - volcanic rocks KW - contaminant plumes KW - isotopes KW - igneous rocks KW - simulation KW - radioactive isotopes KW - transport KW - tuff KW - breakthrough curves KW - heterogeneity KW - high-level waste KW - experimental studies KW - numerical models KW - effluents KW - pollution KW - rates KW - adsorption KW - pyroclastics KW - metals KW - uranium KW - actinides KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328505428?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Geological+Congress%2C+Abstracts+%3D+Congres+Geologique+International%2C+Resumes&rft.atitle=Inverse+modeling+of+experiments+to+support+more+realistic+simulations+of+sorbing+radionuclide+transport&rft.au=James%2C+Scott+C%3BReimus%2C+Paul+W%3BArnold%2C+Bill+W%3BAnonymous&rft.aulast=James&rft.aufirst=Scott&rft.date=2012-01-01&rft.volume=34&rft.issue=&rft.spage=3618&rft.isbn=&rft.btitle=&rft.title=International+Geological+Congress%2C+Abstracts+%3D+Congres+Geologique+International%2C+Resumes&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - 34th international geological congress N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by International Geological Congress Organizational Committee N1 - Date revised - 2013-01-01 N1 - Last updated - 2013-04-19 N1 - CODEN - IGABBY N1 - SubjectsTermNotLitGenreText - actinides; adsorption; breakthrough curves; contaminant plumes; desorption; effluents; experimental studies; heterogeneity; high-level waste; igneous rocks; isotopes; metals; neptunium; numerical models; pollution; pyroclastics; radioactive isotopes; rates; simulation; sorption; transport; tuff; uranium; volcanic rocks ER - TY - JOUR T1 - Modeling the effects of silica deposition and fault rupture on natural geothermal systems AN - 1328502804; 2013-033237 AB - Natural geothermal convection abounds within the Taupo Volcanic Zone (TVZ) of New Zealand's Central North Island. In many locations the highly porous eruptive products that blanket the landscape have been altered by the throughput of hydrothermal fluids and the consequent deposition of silica. We detail a numerical model that considers the evolution of a geothermal plume in the presence of silica deposition/dissolution that controls an evolving permeability distribution. Precipitation of silica occurs according to a gradient reaction regime, in which the dissolved silica concentration is controlled by the temperature dependent silica solubility. Over a period of 120 kyr, continuous geothermal circulation leads to the development of a low permeability cap-zone, approximately 200 m thick, above the main geothermal upflow zone. The cap-zone encourages lateral flow of rising fluids, increasing the area across which geothermal expression is observed. It also has an insulating effect on fluids below the cap, causing increases in temperature, enthalpy, and the reservoir potential of the field. A second model is constructed to consider the specific scenario of fault rupture through the impermeable cap-zone. Coseismic increases in permeability along the fault plane produce vigorous, renewed flow through the center of the geothermal field, temporarily reducing lateral flows. However, resealing of near surface permeability is rapid, and the restoration of lateral flows and recovery of the geothermal reservoir occurs within approximately 10 kyr. These effects are discussed in the context of two TVZ geothermal fields: the extinct Ohakuri field, and Te Kopia, which is situated on a major active normal fault. JF - Journal of Geophysical Research AU - Dempsey, D E AU - Rowland, J V AU - Zyvoloski, G A AU - Archer, R A Y1 - 2012 PY - 2012 DA - 2012 EP - Citation B05207 PB - American Geophysical Union, Washington, DC VL - 117 IS - B5 SN - 0148-0227, 0148-0227 KW - solute transport KW - fluid dynamics KW - solution KW - North Island KW - ground water KW - geothermal systems KW - fault planes KW - transport KW - volcanism KW - silica KW - hydrodynamics KW - geochemistry KW - faults KW - hydrology KW - numerical models KW - Australasia KW - Taupo volcanic zone KW - convection KW - hydrochemistry KW - porosity KW - thermal waters KW - models KW - geothermal energy KW - geothermal fields KW - precipitation KW - permeability KW - New Zealand KW - fault zones KW - 29A:Economic geology, geology of energy sources KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328502804?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Modeling+the+effects+of+silica+deposition+and+fault+rupture+on+natural+geothermal+systems&rft.au=Dempsey%2C+D+E%3BRowland%2C+J+V%3BZyvoloski%2C+G+A%3BArcher%2C+R+A&rft.aulast=Dempsey&rft.aufirst=D&rft.date=2012-01-01&rft.volume=117&rft.issue=B5&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2012JB009218 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 40 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2013-04-19 N1 - SubjectsTermNotLitGenreText - Australasia; convection; fault planes; fault zones; faults; fluid dynamics; geochemistry; geothermal energy; geothermal fields; geothermal systems; ground water; hydrochemistry; hydrodynamics; hydrology; models; New Zealand; North Island; numerical models; permeability; porosity; precipitation; silica; solute transport; solution; Taupo volcanic zone; thermal waters; transport; volcanism DO - http://dx.doi.org/10.1029/2012JB009218 ER - TY - JOUR T1 - Nonlinear dynamical triggering of slow slip on simulated earthquake faults with implications to Earth AN - 1328502527; 2013-033213 AB - Among the most fascinating, recent discoveries in seismology are the phenomena of dynamically triggered fault slip, including earthquakes, tremor, slow and silent slip--during which little seismic energy is radiated--and low frequency earthquakes. Dynamic triggering refers to the initiation of fault slip by a transient deformation perturbation, most often in the form of passing seismic waves. Determining the frictional constitutive laws and the physical mechanism(s) governing triggered faulting is extremely challenging because slip nucleation depths for tectonic faults cannot be probed directly. Of the spectrum of slip behaviors, triggered slow slip is particularly difficult to characterize due to the absence of significant seismic radiation, implying mechanical conditions different from triggered earthquakes. Slow slip is often accompanied by nonvolcanic tremor in close spatial and temporal proximity. The causal relationship between them has implications for the properties and physics governing the fault slip behavior. We are characterizing the physical controls of triggered slow slip via laboratory experiments using sheared granular media to simulate fault gouge. Granular rock and glass beads are sheared under constant normal stress, while subjected to transient stress perturbation by acoustic waves. Here we describe experiments with glass beads, showing that slow and silent slip can be dynamically triggered on laboratory faults by ultrasonic waves. The laboratory triggering may take place during stable sliding (constant friction and slip velocity) and/or early in the slip cycle, during unstable sliding (stick-slip). Experimental evidence indicates that the nonlinear-dynamical response of the gouge material is responsible for the triggered slow slip. JF - Journal of Geophysical Research AU - Johnson, P A AU - Carpenter, B AU - Knuth, M AU - Kaproth, B M AU - Le Bas, P Y AU - Daub, E G AU - Marone, C Y1 - 2012 PY - 2012 DA - 2012 EP - Citation B04310 PB - American Geophysical Union, Washington, DC VL - 117 IS - B4 SN - 0148-0227, 0148-0227 KW - risk management KW - slip rates KW - displacements KW - deformation KW - seismicity KW - seismic risk KW - risk assessment KW - tectonics KW - seismic energy KW - nonlinear processes KW - earthquakes KW - seismotectonics KW - faults KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328502527?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Nonlinear+dynamical+triggering+of+slow+slip+on+simulated+earthquake+faults+with+implications+to+Earth&rft.au=Johnson%2C+P+A%3BCarpenter%2C+B%3BKnuth%2C+M%3BKaproth%2C+B+M%3BLe+Bas%2C+P+Y%3BDaub%2C+E+G%3BMarone%2C+C&rft.aulast=Johnson&rft.aufirst=P&rft.date=2012-01-01&rft.volume=117&rft.issue=B4&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JB008594 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 42 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2013-04-19 N1 - SubjectsTermNotLitGenreText - deformation; displacements; earthquakes; faults; nonlinear processes; risk assessment; risk management; seismic energy; seismic risk; seismicity; seismotectonics; slip rates; tectonics DO - http://dx.doi.org/10.1029/2011JB008594 ER - TY - JOUR T1 - Neptunium (V) adsorption to a halophilic bacterium at 2 and 4 M ionic strength; surface complexation modeling in high ionic strength systems AN - 1320156534; 2013-028304 AB - The mobility of neptunium (V) in high ionic strength aqueous environmental systems, such as in the vicinity of salt-based nuclear waste repositories and high ionic-strength groundwater at Department of Energy sites, may be strongly influenced by adsorption to the cell wall of halophilic bacteria. This is the first study to evaluate the adsorption of neptunium (V) to the surface of a halophilic bacterium as a function of pH at the relatively high ionic strengths of 2 and 4 M. The experimental adsorption data were incorporated into a surface complexation model that was adapted for high ionic strength conditions where traditional corrections for aqueous ion activity are invalid. Adsorption was significant over the entire pH range evaluated for both ionic strength conditions and was shown to be dependent on the speciation of the sites on the bacterial surface and neptunium (V) in solution. Strong electrostatic attraction controlled the adsorption behavior of the positively charged neptunyl ion to the negatively charged bacterial surface at pH below circum-neutral. At pH above circum-neutral, the influence of negatively charged neptunium (V) carbonate complexes resulted in decreased, although still significant, adsorption. Adsorption in 4 M NaClO (sub 4) was enhanced relative to adsorption in 2 M NaClO (sub 4) over the majority of the pH range evaluated, apparently due to the effect of increasing aqueous ion activity at high ionic strength. JF - Mineralogical Magazine AU - Ams, David A AU - Swanson, Juliet S AU - Szymanowski, Jennifer E S AU - Fein, Jeremy B AU - Richmann, Michael M AU - Reed, Donald T AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 1421 PB - Mineralogical Society, London VL - 76 IS - 6 SN - 0026-461X, 0026-461X KW - neptunium KW - complexing KW - adsorption KW - ions KW - radioactive waste KW - ground water KW - models KW - chemical reactions KW - metals KW - bacteria KW - waste disposal KW - mobility KW - actinides KW - pH KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1320156534?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Neptunium+%28V%29+adsorption+to+a+halophilic+bacterium+at+2+and+4+M+ionic+strength%3B+surface+complexation+modeling+in+high+ionic+strength+systems&rft.au=Ams%2C+David+A%3BSwanson%2C+Juliet+S%3BSzymanowski%2C+Jennifer+E+S%3BFein%2C+Jeremy+B%3BRichmann%2C+Michael+M%3BReed%2C+Donald+T%3BAnonymous&rft.aulast=Ams&rft.aufirst=David&rft.date=2012-01-01&rft.volume=76&rft.issue=6&rft.spage=1421&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/76/6/1401.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt 2012 N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2013-01-01 N1 - Document feature - illus. N1 - Last updated - 2013-04-19 N1 - CODEN - MNLMBB N1 - SubjectsTermNotLitGenreText - actinides; adsorption; bacteria; chemical reactions; complexing; ground water; ions; metals; mobility; models; neptunium; pH; radioactive waste; waste disposal ER - TY - JOUR T1 - The isotopic composition and fluence of solar-wind nitrogen in a Genesis B/C array collector AN - 1316371895; 2013-024793 AB - We have measured the isotopic composition and fluence of solar-wind nitrogen in a diamond-like-carbon collector from the Genesis B/C array. The B and C collector arrays on the Genesis spacecraft passively collected bulk solar wind for the entire collection period, and there is no need to correct data for instrumental fractionation during collection, unlike data from the Genesis "Concentrator." This work validates isotopic measurements from the concentrator by Marty et al. (2010, 2011); nitrogen in the solar wind is depleted in (super 15) N relative to nitrogen in the Earth's atmosphere. Specifically, our array data yield values for (super 15) N/ (super 14) N of (2.17 + or - 0.37) X 10 (super -3) and (2.12 + or - 0.34) X 10 (super -3) , depending on data-reduction technique. This result contradicts preliminary results reported for previous measurements on B/C array materials by Pepin et al. (2009), so the discrepancy between Marty et al. (2010, 2011) and Pepin et al. (2009) was not due to fractionation of solar wind by the concentrator. Our measured value of (super 15) N/ (super 14) N in the solar wind shows that the Sun, and by extension the solar nebula, lie at the low- (super 15) N/ (super 14) N end of the range of nitrogen isotopic compositions observed in the solar system. A global process (or combination of processes) must have operated in interstellar space and/or during the earliest stages of solar system formation to increase the (super 15) N/ (super 14) N ratio of the solar system solids. We also report a preliminary Genesis solar-wind nitrogen fluence of (2.57 + or - 0.42) X 1012 cm (super -2) . This value is higher than that derived by backside profiling of a Genesis silicon collector (Heber et al. 2011a). JF - Meteoritics & Planetary Science AU - Huss, Gary R AU - Nagashima, Kazuhide AU - Jurewicz, Amy J G AU - Burnett, Donald S AU - Olinger, Chad T Y1 - 2012 PY - 2012 DA - 2012 SP - 1436 EP - 1448 PB - Meteoritical Society, Fayetteville, AR VL - 47 IS - 9 SN - 1086-9379, 1086-9379 KW - isotope fractionation KW - N-15/N-14 KW - Genesis Mission KW - isotopes KW - isotope ratios KW - solar wind KW - data processing KW - stable isotopes KW - nitrogen KW - solar nebula KW - Sun KW - fluence KW - arrays KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1316371895?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=The+isotopic+composition+and+fluence+of+solar-wind+nitrogen+in+a+Genesis+B%2FC+array+collector&rft.au=Huss%2C+Gary+R%3BNagashima%2C+Kazuhide%3BJurewicz%2C+Amy+J+G%3BBurnett%2C+Donald+S%3BOlinger%2C+Chad+T&rft.aulast=Huss&rft.aufirst=Gary&rft.date=2012-01-01&rft.volume=47&rft.issue=9&rft.spage=1436&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/10.1111%2Fj.1945-5100.2012.01406.x L2 - http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 48 N1 - PubXState - AR N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2013-03-14 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - arrays; data processing; fluence; Genesis Mission; isotope fractionation; isotope ratios; isotopes; N-15/N-14; nitrogen; solar nebula; solar wind; stable isotopes; Sun DO - http://dx.doi.org/10.1111/j.1945-5100.2012.01406.x ER - TY - JOUR T1 - Charged nanograins in the Enceladus plume AN - 1312836812; 2013-022758 AB - There have been three Cassini encounters with the south-pole eruptive plume of Enceladus for which the Cassini Plasma Spectrometer (CAPS) had viewing in the spacecraft ram direction. In each case, CAPS detected a cold dense population of heavy charged particles having mass-to-charge (m/q) ratios up to the maximum detectable by CAPS ( approximately 10 (super 4) amu/e). These particles are interpreted as singly charged nanometer-sized water-ice grains. Although they are detected with both negative and positive net charges, the former greatly outnumber the latter, at least in the m/q range accessible to CAPS. On the most distant available encounter (E3, March 2008) we derive a net (negative) charge density of up to approximately 2600 e/cm (super 3) for nanograins, far exceeding the ambient plasma number density, but less than the net (positive) charge density inferred from the RPWS Langmuir probe data during the same plume encounter. Comparison of the CAPS data from the three available encounters is consistent with the idea that the nanograins leave the surface vents largely uncharged, but become increasingly negatively charged by plasma electron impact as they move farther from the satellite. These nanograins provide a potentially potent source of magnetospheric plasma and E-ring material. JF - Journal of Geophysical Research AU - Hill, T W AU - Thomsen, M F AU - Tokar, R L AU - Coates, A J AU - Lewis, G R AU - Young, D T AU - Crary, F J AU - Baragiola, R A AU - Johnson, R E AU - Dong, Y AU - Wilson, R J AU - Jones, G H AU - Wahlund, J E AU - Mitchell, D G AU - Horanyi, M Y1 - 2012 PY - 2012 DA - 2012 EP - Citation A05209 PB - American Geophysical Union, Washington, DC VL - 117 IS - A5 SN - 0148-0227, 0148-0227 KW - icy satellites KW - plumes KW - monitoring KW - giant planets KW - Saturn KW - planets KW - Cassini-Huygens Mission KW - eruptions KW - outer planets KW - Enceladus Satellite KW - satellites KW - remote sensing KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312836812?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Charged+nanograins+in+the+Enceladus+plume&rft.au=Hill%2C+T+W%3BThomsen%2C+M+F%3BTokar%2C+R+L%3BCoates%2C+A+J%3BLewis%2C+G+R%3BYoung%2C+D+T%3BCrary%2C+F+J%3BBaragiola%2C+R+A%3BJohnson%2C+R+E%3BDong%2C+Y%3BWilson%2C+R+J%3BJones%2C+G+H%3BWahlund%2C+J+E%3BMitchell%2C+D+G%3BHoranyi%2C+M&rft.aulast=Hill&rft.aufirst=T&rft.date=2012-01-01&rft.volume=117&rft.issue=A5&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JA017218 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 40 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2013-02-28 N1 - SubjectsTermNotLitGenreText - Cassini-Huygens Mission; Enceladus Satellite; eruptions; giant planets; icy satellites; monitoring; outer planets; planets; plumes; remote sensing; satellites; Saturn DO - http://dx.doi.org/10.1029/2011JA017218 ER - TY - JOUR T1 - Auto-acoustic compaction in steady shear flows; experimental evidence for suppression of shear dilatancy by internal acoustic vibration AN - 1287377700; 2013-017822 AB - Granular shear flows are intrinsic to many geophysical processes, ranging from landslides and debris flows to earthquake rupture on gouge-filled faults. The rheology of a granular flow depends strongly on the boundary conditions and shear rate. Earthquake rupture involves a transition from quasi-static to rapid shear rates. Understanding the processes controlling the transitional rheology is potentially crucial for understanding the rupture process and the coseismic strength of faults. Here we explore the transition experimentally using a commercial torsional rheometer. We measure the thickness of a steady shear flow at velocities between 10 (super -3) and 10 (super 2) cm/s, at very low normal stress (7 kPa), and observe that thickness is reduced at intermediate velocities (0.1-10 cm/s) for angular particles, but not for smooth glass beads. The maximum reduction in thickness is on the order of 10% of the active shear zone thickness, and scales with the amplitude of shear-generated acoustic vibration. By examining the response to externally applied vibration, we show that the thinning reflects a feedback between internally generated acoustic vibration and granular rheology. We link this phenomenon to acoustic compaction of a dilated granular medium, and formulate an empirical model for the steady state thickness of a shear-zone in which shear-induced dilatation is balanced by a newly identified mechanism we call auto-acoustic compaction. This mechanism is activated when the acoustic pressure is on the order of the confining pressure, and results in a velocity-weakening granular flow regime at shear rates four orders of magnitude below those previously associated with the transition out of quasi-static granular flow. Although the micromechanics of granular deformation may change with greater normal stress, auto-acoustic compaction should influence the rheology of angular fault gouge at higher stresses, as long as the gouge has nonzero porosity during shear. JF - Journal of Geophysical Research AU - van der Elst, Nicholas J AU - Brodsky, Emily E AU - Le Bas, Pierre-Yves AU - Johnson, Paul A Y1 - 2012 PY - 2012 DA - 2012 EP - Citation B09314 PB - American Geophysical Union, Washington, DC VL - 117 IS - B9 SN - 0148-0227, 0148-0227 KW - shear zones KW - stress KW - mechanical properties KW - debris flows KW - porosity KW - rock mechanics KW - models KW - compaction KW - landslides KW - rupture KW - coseismic processes KW - granular materials KW - gouge KW - rheology KW - mass movements KW - shear KW - vibration KW - velocity KW - thickness KW - torsion KW - earthquakes KW - faults KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1287377700?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Auto-acoustic+compaction+in+steady+shear+flows%3B+experimental+evidence+for+suppression+of+shear+dilatancy+by+internal+acoustic+vibration&rft.au=van+der+Elst%2C+Nicholas+J%3BBrodsky%2C+Emily+E%3BLe+Bas%2C+Pierre-Yves%3BJohnson%2C+Paul+A&rft.aulast=van+der+Elst&rft.aufirst=Nicholas&rft.date=2012-01-01&rft.volume=117&rft.issue=B9&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JB008897 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 34 N1 - PubXState - DC N1 - Document feature - illus. incl. 3 tables N1 - Last updated - 2013-02-14 N1 - SubjectsTermNotLitGenreText - compaction; coseismic processes; debris flows; earthquakes; faults; gouge; granular materials; landslides; mass movements; mechanical properties; models; porosity; rheology; rock mechanics; rupture; shear; shear zones; stress; thickness; torsion; velocity; vibration DO - http://dx.doi.org/10.1029/2011JB008897 ER - TY - JOUR T1 - Stony meteorite thermal properties and their relationship with meteorite chemical and physical states AN - 1287375925; 2013-017948 AB - In our ongoing survey of meteorite physical properties, we have to date measured the thermal conductivity for seventeen stony meteorites at temperatures ranging from 5 K to 300 K. Here, we report new results for nine ordinary chondrites, one enstatite chondrite, and the basaltic achondrites Frankfort (howardite) and Los Angeles (shergottite). We find that thermal conductivity is significantly lower than would be expected from averaging the laboratory conductivities of their constituent minerals, with a dependence on temperature different from the expected conductivity of pure minerals. In addition, we find a linear relationship between the inverse of the porosity of the samples measured and their thermal conductivity, regardless of meteorite composition or type. We conclude that thermal conductivity is controlled by the presence of shock-induced microcracks within the meteorites, which provide a barrier to the transmission of thermal energy via phonons. In contrast to conductivity, our first measurement of heat capacity as a function of temperature (on Los Angeles) suggests that heat capacity is primarily a function of oxide composition and is not strongly affected by the physical state of the sample. JF - Meteoritics & Planetary Science AU - Opeil, C P AU - Consolmagno, Guy J AU - Sararik, D J AU - Britt, Daniel T Y1 - 2012 PY - 2012 DA - 2012 SP - 319 EP - 329 PB - Meteoritical Society, Fayetteville, AR VL - 47 IS - 3 SN - 1086-9379, 1086-9379 KW - ordinary chondrites KW - stony meteorites KW - density KW - thermal conductivity KW - microcracks KW - Martian meteorites KW - Los Angeles Meteorite KW - heat capacity KW - temperature KW - magnetic properties KW - SNC Meteorites KW - meteorites KW - howardite KW - heat flow KW - enstatite chondrites KW - chondrites KW - bulk density KW - thermal properties KW - grain density KW - achondrites KW - porosity KW - physical properties KW - cracks KW - shergottite KW - magnetic susceptibility KW - Frankfort Meteorite KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1287375925?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Stony+meteorite+thermal+properties+and+their+relationship+with+meteorite+chemical+and+physical+states&rft.au=Opeil%2C+C+P%3BConsolmagno%2C+Guy+J%3BSararik%2C+D+J%3BBritt%2C+Daniel+T&rft.aulast=Opeil&rft.aufirst=C&rft.date=2012-01-01&rft.volume=47&rft.issue=3&rft.spage=319&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/10.1111%2Fj.1945-5100.2012.01331.x L2 - http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 18 N1 - PubXState - AR N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2013-02-14 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - achondrites; bulk density; chondrites; cracks; density; enstatite chondrites; Frankfort Meteorite; grain density; heat capacity; heat flow; howardite; Los Angeles Meteorite; magnetic properties; magnetic susceptibility; Martian meteorites; meteorites; microcracks; ordinary chondrites; physical properties; porosity; shergottite; SNC Meteorites; stony meteorites; temperature; thermal conductivity; thermal properties DO - http://dx.doi.org/10.1111/j.1945-5100.2012.01331.x ER - TY - JOUR T1 - Mathematical modelling of HCV infection: what can it teach us in the era of direct-acting antiviral agents? AN - 1285093627; 17592244 AB - HCV infection is a major cause of chronic liver disease and affects nearly 170 million people worldwide. Whereas the previous standard of care with pegylated interferon and ribavirin had a modest effectiveness, the recent approval of two highly potent protease inhibitors and the ongoing development of dozens of direct-acting antiviral agents (DAAs) constitute a major milestone for HCV therapy. Mathematical modelling of viral kinetics under treatment has played an instrumental role in improving our understanding of virus pathogenesis and in guiding drug development. Here, we review the current state of HCV kinetic modelling, and challenges to the standard biphasic viral decline model that arise when fitting viral kinetic models to data obtained with DAAs. JF - Antiviral Therapy AU - Chatterjee, A AU - Guedj, J AU - Perelson, A S Y1 - 2012 PY - 2012 DA - 2012 SP - 1171 EP - 1182 VL - 17 IS - 6 SN - 1359-6535, 1359-6535 KW - Microbiology Abstracts A: Industrial & Applied Microbiology; Virology & AIDS Abstracts KW - Antiviral agents KW - Chronic infection KW - Data processing KW - Drug development KW - Interferon KW - Kinetics KW - Liver diseases KW - Mathematical models KW - Proteinase inhibitors KW - Reviews KW - Ribavirin KW - Hepatitis C virus KW - A 01340:Antibiotics & Antimicrobials KW - V 22400:Human Diseases UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1285093627?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologya&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Antiviral+Therapy&rft.atitle=Mathematical+modelling+of+HCV+infection%3A+what+can+it+teach+us+in+the+era+of+direct-acting+antiviral+agents%3F&rft.au=Chatterjee%2C+A%3BGuedj%2C+J%3BPerelson%2C+A+S&rft.aulast=Chatterjee&rft.aufirst=A&rft.date=2012-01-01&rft.volume=17&rft.issue=6&rft.spage=1171&rft.isbn=&rft.btitle=&rft.title=Antiviral+Therapy&rft.issn=13596535&rft_id=info:doi/10.3851%2FIMP2428 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-01 N1 - Last updated - 2013-04-05 N1 - SubjectsTermNotLitGenreText - Interferon; Data processing; Liver diseases; Mathematical models; Antiviral agents; Reviews; Kinetics; Proteinase inhibitors; Ribavirin; Chronic infection; Drug development; Hepatitis C virus DO - http://dx.doi.org/10.3851/IMP2428 ER - TY - JOUR T1 - Evaluation of the Assessing Institutional Digital Assets (AIDA) Toolkit AN - 1283634590; 201301325 AB - Libraries are becoming more involved in the complex task of managing the digital assets created by members of their institutions. Many tools have been created to help librarians understand and solve the problems associated with this task. One of these tools is the Joint Information Systems Committee's Assessing Institutional Digital Assets (AIDA) toolkit, which is designed to help institutions assess their current readiness and ability to manage digital assets. This article provides a review and evaluation of the AIDA toolkit as used by Los Alamos National Laboratory Research Library. Adapted from the source document. JF - Science & Technology Libraries AU - Miller, Laniece AU - Blake, Miriam AU - Sorsby, Melanie AD - Los Alamos National Laboratory Research Library, Los Alamos, New Mexico lemiller@lanl.gov Y1 - 2012/01// PY - 2012 DA - January 2012 SP - 92 EP - 99 PB - Taylor & Francis, Philadelphia PA VL - 31 IS - 1 SN - 0194-262X, 0194-262X KW - digital asset management tools KW - AIDA toolkit KW - digital curation KW - data management planning KW - Joint Information Systems Committee KW - Evaluation KW - Digital preservation KW - Libraries KW - Planning KW - Digital curation KW - article KW - 9.15: TECHNICAL SERVICES - PRESERVATION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1283634590?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science+%26+Technology+Libraries&rft.atitle=Evaluation+of+the+Assessing+Institutional+Digital+Assets+%28AIDA%29+Toolkit&rft.au=Miller%2C+Laniece%3BBlake%2C+Miriam%3BSorsby%2C+Melanie&rft.aulast=Miller&rft.aufirst=Laniece&rft.date=2012-01-01&rft.volume=31&rft.issue=1&rft.spage=92&rft.isbn=&rft.btitle=&rft.title=Science+%26+Technology+Libraries&rft.issn=0194262X&rft_id=info:doi/10.1080%2F0194262X.2012.648098 LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2013-02-01 N1 - Last updated - 2016-09-27 N1 - SubjectsTermNotLitGenreText - Digital curation; Digital preservation; Evaluation; Planning; Libraries DO - http://dx.doi.org/10.1080/0194262X.2012.648098 ER - TY - JOUR T1 - What controls primary production in the Arctic Ocean; results from an intercomparison of five general circulation models with biogeochemistry AN - 1282824774; 2013-014982 AB - As a part of Arctic Ocean Intercomparison Project, results from five coupled physical and biological ocean models were compared for the Arctic domain, defined here as north of 66.6 degrees N. The global and regional (Arctic Ocean (AO)-only) models included in the intercomparison show similar features in terms of the distribution of present-day water column-integrated primary production and are broadly in agreement with in situ and satellite-derived data. However, the physical factors controlling this distribution differ between the models. The intercomparison between models finds substantial variation in the depth of winter mixing, one of the main mechanisms supplying inorganic nutrients over the majority of the AO. Although all models manifest similar level of light limitation owing to general agreement on the ice distribution, the amount of nutrients available for plankton utilization is different between models. Thus the participating models disagree on a fundamental question: which factor, light or nutrients, controls present-day Arctic productivity. These differences between models may not be detrimental in determining present-day AO primary production since both light and nutrient limitation are tightly coupled to the presence of sea ice. Essentially, as long as at least one of the two limiting factors is reproduced correctly, simulated total primary production will be close to that observed. However, if the retreat of Arctic sea ice continues into the future as expected, a decoupling between sea ice and nutrient limitation will occur, and the predictive capabilities of the models may potentially diminish unless more effort is spent on verifying the mechanisms of nutrient supply. Our study once again emphasizes the importance of a realistic representation of ocean physics, in particular vertical mixing, as a necessary foundation for ecosystem modeling and predictions. JF - Journal of Geophysical Research AU - Popova, Ekaterina E AU - Yool, Andrew AU - Coward, Andrew C AU - Dupont, Frederic AU - Deal, Clara AU - Elliott, Scott AU - Hunke, Elizabeth AU - Jin, Meibing AU - Steele, Mike AU - Zhang, Jinlun Y1 - 2012 PY - 2012 DA - 2012 EP - Citation C00D12 PB - American Geophysical Union, Washington, DC VL - 117 IS - C SN - 0148-0227, 0148-0227 KW - general circulation models KW - sea water KW - biochemistry KW - Arctic region KW - sea ice KW - ice cover KW - salinity KW - satellite methods KW - temperature KW - ice KW - Arctic Ocean KW - ecology KW - chemical composition KW - remote sensing KW - productivity KW - ice cover distribution KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282824774?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=What+controls+primary+production+in+the+Arctic+Ocean%3B+results+from+an+intercomparison+of+five+general+circulation+models+with+biogeochemistry&rft.au=Popova%2C+Ekaterina+E%3BYool%2C+Andrew%3BCoward%2C+Andrew+C%3BDupont%2C+Frederic%3BDeal%2C+Clara%3BElliott%2C+Scott%3BHunke%2C+Elizabeth%3BJin%2C+Meibing%3BSteele%2C+Mike%3BZhang%2C+Jinlun&rft.aulast=Popova&rft.aufirst=Ekaterina&rft.date=2012-01-01&rft.volume=117&rft.issue=C&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JC007112 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 57 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table, sketch maps N1 - Last updated - 2013-02-05 N1 - SubjectsTermNotLitGenreText - Arctic Ocean; Arctic region; biochemistry; chemical composition; ecology; general circulation models; ice; ice cover; ice cover distribution; productivity; remote sensing; salinity; satellite methods; sea ice; sea water; temperature DO - http://dx.doi.org/10.1029/2011JC007112 ER - TY - JOUR T1 - Fracture alteration by precipitation resulting from thermal gradients; upscaled mean aperture-effective transmissivity relationship AN - 1282824448; 2013-015086 AB - Precipitation and dissolution reactions in fractures alter apertures, which in turn affects their flow and transport properties. We consider aperture alteration by precipitation in a "gradient-reaction" regime where fluids are close to chemical equilibrium with a mineral everywhere, but precipitation is driven by solubility gradients. Monte Carlo simulations on computer-generated aperture fields suggest that the most important feature of fracture alteration by precipitation is the formation of elongated precipitate bodies perpendicular to the mean flow direction. The simulation results provide a basis for a proposed upscaling relationship between mean aperture and the effective transmissivity tensor, incorporating a critical aperture at which the transmissivity decreases steeply. JF - Water Resources Research AU - Chaudhuri, A AU - Rajaram, H AU - Viswanathan, H Y1 - 2012 PY - 2012 DA - 2012 EP - Citation W01601 PB - American Geophysical Union, Washington, DC VL - 48 IS - 1 SN - 0043-1397, 0043-1397 KW - hydrology KW - Monte Carlo analysis KW - statistical analysis KW - data processing KW - solubility KW - solution KW - fractures KW - theoretical studies KW - transmissivity KW - precipitation KW - digital simulation KW - permeability KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282824448?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Fracture+alteration+by+precipitation+resulting+from+thermal+gradients%3B+upscaled+mean+aperture-effective+transmissivity+relationship&rft.au=Chaudhuri%2C+A%3BRajaram%2C+H%3BViswanathan%2C+H&rft.aulast=Chaudhuri&rft.aufirst=A&rft.date=2012-01-01&rft.volume=48&rft.issue=1&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1029%2F2011WR010983 L2 - http://www.agu.org/journals/wr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 19 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2013-02-05 N1 - CODEN - WRERAQ N1 - SubjectsTermNotLitGenreText - data processing; digital simulation; fractures; hydrology; Monte Carlo analysis; permeability; precipitation; solubility; solution; statistical analysis; theoretical studies; transmissivity DO - http://dx.doi.org/10.1029/2011WR010983 ER - TY - JOUR T1 - ORGANIC GEOCHEMICAL COMPOSITION OF THE GEORGIA KAOLINS: INSIGHTS INTO FORMATION AND DIAGENETIC CONDITIONS AN - 1272709143; 17524185 AB - Most previous studies of the kaolin deposits in the southeastern United States have focused on their mineralogy and petrology to understand better the depositional and diagenetic environments of the kaolins. Many studies suggest, however, that much of the information held within the minerals was changed during extensive post-depositional groundwater and microbial alteration. Organic delta (13)C and biomarker analyses were used, therefore, to provide further information on the nature of the original sediments, the depositional environment(s), and the amount of diagenetic alteration that has occurred in Georgia kaolin deposits. Two different types of kaolin can be discerned, based on their total organic carbon contents: organic-lean kaolin and lignitic kaolin. The bulk organic delta (13)C in the Georgia kaolins ranges from -26 to -19% (VPDB, Vienna Pee Dee Belemnite standard), with a noticeable enrichment in (13)C with decrease in organic carbon concentration. The lean kaolins are by far the more dominant types, with an organic-matter composition primarily of C(16)-C(22) n-alkanes, C(16) and C(18) fatty acids, and unresolved complex mixtures. Lignitic kaolin has a distinctly different organic matter (OM) composition. The lignitic material is primarily C(15)-C(33) n-alkanes with a greater abundance of C(23)-C(31) n-alkanes and lesser amounts of resinous and microbial constituents along with the oxidized forms of the saturated lipid fractions. Biomarker data suggest that the lignitic material is primarily terrestrially derived from conifers with minor input from microbial lipids. The OM in both types of kaolin shows strong signs of microbial decomposition that yield the organically lean kaolins. The oxidation of the detrital organic matter would subsequently yield organic acids that would have exerted significant influence on the mineralogy and metal mobility. JF - Clays and Clay Minerals AU - Cheshire, Michael C AU - Bish, David L AU - Brassell, Simon C AD - Department of Geological Sciences, Indiana University, Bloomington, IN 47405, USA, cheshire@lanl.gov Y1 - 2012 PY - 2012 DA - 2012 SP - 420 EP - 439 PB - Clay Minerals Society, PO Box 460130 Aurora, CO 80046 United States VL - 60 IS - 4 SN - 0009-8604, 0009-8604 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Bioindicators KW - Animal fossils KW - Organic Carbon KW - Lipids KW - Organic matter KW - Geochemistry KW - Organic carbon KW - Mineralogy KW - USA, Georgia KW - Kaolin KW - Biomarkers KW - USA, Southeast KW - Yield KW - Organic Matter KW - Microorganisms KW - Fatty acids KW - Groundwater KW - Enrichment KW - Diagenesis KW - Q2 09264:Sediments and sedimentation KW - SW 0840:Groundwater UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1272709143?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Clays+and+Clay+Minerals&rft.atitle=ORGANIC+GEOCHEMICAL+COMPOSITION+OF+THE+GEORGIA+KAOLINS%3A+INSIGHTS+INTO+FORMATION+AND+DIAGENETIC+CONDITIONS&rft.au=Cheshire%2C+Michael+C%3BBish%2C+David+L%3BBrassell%2C+Simon+C&rft.aulast=Cheshire&rft.aufirst=Michael&rft.date=2012-01-01&rft.volume=60&rft.issue=4&rft.spage=420&rft.isbn=&rft.btitle=&rft.title=Clays+and+Clay+Minerals&rft.issn=00098604&rft_id=info:doi/10.1346%2FCCMN.2012.0600408 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-01-01 N1 - Number of references - 67 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Animal fossils; Organic matter; Organic carbon; Geochemistry; Fatty acids; Mineralogy; Biomarkers; Kaolin; Diagenesis; Bioindicators; Yield; Organic Matter; Lipids; Organic Carbon; Microorganisms; Enrichment; Groundwater; USA, Georgia; USA, Southeast DO - http://dx.doi.org/10.1346/CCMN.2012.0600408 ER - TY - JOUR T1 - Interaction of ocean temperature advection, surface heat fluxes and sea ice in the marginal ice zone during the North Atlantic Oscillation in the 1990s; a modeling study AN - 1270038609; 2013-010122 AB - A moderately fine-resolution (0.4 degrees , 40 vertical levels), global, coupled ice-ocean model was configured and run for 24 years (1979-2002), forced with high-frequency National Center for Environmental Prediction/National Center for Atmospheric Research (NCEP/NCAR) atmospheric fluxes. The model consists of the Los Alamos National Laboratory Parallel Ocean Program (POP) and sea ice model (CICE). The fidelity of the simulated mean climatological state and variability of key variables such as ice concentration, total ice area, ice thickness and drift were compared to observational data sets from satellite and ice drift buoy measurements. Basin-scale changes in the lower atmosphere/surface ocean/sea-ice in the simulated Arctic and Nordic Seas before and after the North Atlantic Oscillation (NAO) phase switch in 1995 were examined using winter composite analyses over the period 1990-1999. Ice cover changes between the two NAO phases were consistent with observations in that reduced concentrations were found in the Nordic and Barents Seas and increased values occurred in the Labrador Sea. Next we regionally evaluated the relative importance of winter anomalies of upper-ocean mixed layer net heat fluxes and of ocean temperature advection on marginal ice zone variability in the Irminger, Greenland, and Barents Seas for this ten-year period. We found that the net heat flux winter anomaly was at least four times more important than the winter anomaly of ocean temperature advection in the Greenland and Barents Seas, while it was twice as important in the Irminger Sea. The Ekman ocean temperature advection component generally dominated the geostrophic component in all three regions. JF - Journal of Geophysical Research AU - Ivanova, Detelina P AU - McClean, Julie L AU - Hunke, Elizabeth C Y1 - 2012 PY - 2012 DA - 2012 EP - Citation C02031 PB - American Geophysical Union, Washington, DC VL - 117 IS - C2 SN - 0148-0227, 0148-0227 KW - North Atlantic Oscillation KW - currents KW - ocean circulation KW - heat flux KW - Arctic region KW - sea ice KW - ice cover KW - advection KW - ocean currents KW - temperature KW - ice KW - Arctic Ocean KW - seasonal variations KW - sea-surface temperature KW - North Atlantic KW - Atlantic Ocean KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270038609?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Interaction+of+ocean+temperature+advection%2C+surface+heat+fluxes+and+sea+ice+in+the+marginal+ice+zone+during+the+North+Atlantic+Oscillation+in+the+1990s%3B+a+modeling+study&rft.au=Ivanova%2C+Detelina+P%3BMcClean%2C+Julie+L%3BHunke%2C+Elizabeth+C&rft.aulast=Ivanova&rft.aufirst=Detelina&rft.date=2012-01-01&rft.volume=117&rft.issue=C2&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JC007532 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 40 N1 - PubXState - DC N1 - Document feature - illus. incl. sketch map N1 - SuppNotes - Includes appendix N1 - Last updated - 2013-01-17 N1 - SubjectsTermNotLitGenreText - advection; Arctic Ocean; Arctic region; Atlantic Ocean; currents; heat flux; ice; ice cover; North Atlantic; North Atlantic Oscillation; ocean circulation; ocean currents; sea ice; sea-surface temperature; seasonal variations; temperature DO - http://dx.doi.org/10.1029/2011JC007532 ER - TY - JOUR T1 - Quasi-static and dynamic compaction of the JSC-1A lunar regolith simulant AN - 1244699891; 2013-006748 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Plesko, C S AU - Jensen, B J AU - Fredenburg, D A AU - Wescott, B L AU - Skinner McKee, T E AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2746 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - experimental studies KW - shock waves KW - volcanic rocks KW - pressure KW - numerical models KW - quasi-static compaction KW - Moon KW - loading KW - igneous rocks KW - high pressure KW - two-dimensional models KW - dynamic compaction KW - compaction KW - JSC-1A lunar regolith simulant KW - natural analogs KW - basalts KW - volume KW - velocity KW - equations of state KW - thermodynamic properties KW - compression KW - regolith KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244699891?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Quasi-static+and+dynamic+compaction+of+the+JSC-1A+lunar+regolith+simulant&rft.au=Plesko%2C+C+S%3BJensen%2C+B+J%3BFredenburg%2C+D+A%3BWescott%2C+B+L%3BSkinner+McKee%2C+T+E%3BAnonymous&rft.aulast=Plesko&rft.aufirst=C&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2746.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 4 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 25, 2012 N1 - Last updated - 2012-12-27 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - basalts; compaction; compression; dynamic compaction; equations of state; experimental studies; high pressure; igneous rocks; JSC-1A lunar regolith simulant; loading; Moon; natural analogs; numerical models; pressure; quasi-static compaction; regolith; shock waves; thermodynamic properties; two-dimensional models; velocity; volcanic rocks; volume ER - TY - JOUR T1 - Revealing highly complex elastic nonlinear (anelastic) behavior of earth materials applying a new probe; dynamic acoustoelastic testing AN - 1244692106; 2013-007103 AB - Recent work in medical nonlinear acoustics has led to the development of refined experimental method to measure material elastic nonlinear (anelastic) response. The technique, termed dynamic acoustoelastic testing, has significant implications for the development of a physics-based theory because it provides information that existing methods cannot. It provides the means to dynamically study the velocity-strain and attenuation-strain relations through the full wave cycle in contrast to most methods that measure average response. The method relies on vibrating a sample at low frequency in order to cycle it through different levels of stress-strain. Simultaneously, an ultrasonic source applies pulses and the change in wave speed and attenuation as a function of the low frequency strain is measured. We report preliminary results in eleven room-dry rock samples. In crystalline rock, we expect that the elastic nonlinearity arises from the microcracks and dislocations contained within individual crystals. In contrast, sedimentary rocks may have other origins of elastic nonlinearity, currently under debate. A large quadratic elastic nonlinearity is observed in Berkeley blue granite, presumably due to microcracks and dislocation-point defect interactions. In sedimentary rocks that include limestones and sandstones we observe behaviors that can differ markedly from the granite, potentially indicating different mechanical mechanisms. We further observe changes in measured nonlinear coefficients that are wave-strain amplitude dependent. Ultimately we hope that the new approach will provide the means to quantitatively relate material nonlinear elastic behavior to the responsible features, that include soft bonds dislocations, microcracks, and the modulating influences of water content, temperature and pressure. JF - Journal of Geophysical Research AU - Renaud, G AU - Le Bas, P Y AU - Johnson, P A Y1 - 2012 PY - 2012 DA - 2012 EP - Citation B06202 PB - American Geophysical Union, Washington, DC VL - 117 IS - B6 SN - 0148-0227, 0148-0227 KW - experimental studies KW - microcracks KW - igneous rocks KW - elastic properties KW - granites KW - geophysical methods KW - mechanical properties KW - rock mechanics KW - laboratory studies KW - attenuation KW - acoustical methods KW - plutonic rocks KW - cracks KW - crystalline rocks KW - anelasticity KW - nonlinear processes KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244692106?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Revealing+highly+complex+elastic+nonlinear+%28anelastic%29+behavior+of+earth+materials+applying+a+new+probe%3B+dynamic+acoustoelastic+testing&rft.au=Renaud%2C+G%3BLe+Bas%2C+P+Y%3BJohnson%2C+P+A&rft.aulast=Renaud&rft.aufirst=G&rft.date=2012-01-01&rft.volume=117&rft.issue=B6&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JB009127 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 23 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - acoustical methods; anelasticity; attenuation; cracks; crystalline rocks; elastic properties; experimental studies; geophysical methods; granites; igneous rocks; laboratory studies; mechanical properties; microcracks; nonlinear processes; plutonic rocks; rock mechanics DO - http://dx.doi.org/10.1029/2011JB009127 ER - TY - JOUR T1 - Are megaquakes clustered? AN - 1244691291; 2013-007001 AB - We study statistical properties of the number of large earthquakes over the past century. We analyze the cumulative distribution of the number of earthquakes with magnitude larger than threshold M in time interval T, and quantify the statistical significance of these results by simulating a large number of synthetic random catalogs. We find that in general, the earthquake record cannot be distinguished from a process that is random in time. This conclusion holds whether aftershocks are removed or not, except at magnitudes below M=7.3. At long time intervals (T = 2-5 years), we find that statistically significant clustering is present in the catalog for lower magnitude thresholds (M = 7-7.2). However, this clustering is due to a large number of earthquakes on record in the early part of the 20th century, when magnitudes are less certain. JF - Geophysical Research Letters AU - Daub, Eric G AU - Ben-Naim, Eli AU - Guyer, Robert A AU - Johnson, Paul A Y1 - 2012 PY - 2012 DA - 2012 EP - Citation L06308 PB - American Geophysical Union, Washington, DC VL - 39 IS - 6 SN - 0094-8276, 0094-8276 KW - risk management KW - swarms KW - magnitude KW - mitigation KW - seismicity KW - great earthquakes KW - earthquake prediction KW - seismic risk KW - risk assessment KW - tectonics KW - earthquakes KW - seismotectonics KW - faults KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244691291?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Are+megaquakes+clustered%3F&rft.au=Daub%2C+Eric+G%3BBen-Naim%2C+Eli%3BGuyer%2C+Robert+A%3BJohnson%2C+Paul+A&rft.aulast=Daub&rft.aufirst=Eric&rft.date=2012-01-01&rft.volume=39&rft.issue=6&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2012GL051465 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 33 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2012-12-27 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - earthquake prediction; earthquakes; faults; great earthquakes; magnitude; mitigation; risk assessment; risk management; seismic risk; seismicity; seismotectonics; swarms; tectonics DO - http://dx.doi.org/10.1029/2012GL051465 ER - TY - JOUR T1 - Effects of stand-off bursts on rubble-pile targets; evaluation of a hazardous asteroid mitigation strategy AN - 1244683602; 2013-006770 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Korycansky, D G AU - Plesko, C S AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1522 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - X-rays KW - mitigation KW - aggregate KW - irradiation KW - asteroids KW - natural hazards KW - velocity KW - simulation KW - rubble-pile asteroids KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244683602?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Effects+of+stand-off+bursts+on+rubble-pile+targets%3B+evaluation+of+a+hazardous+asteroid+mitigation+strategy&rft.au=Korycansky%2C+D+G%3BPlesko%2C+C+S%3BAnonymous&rft.aulast=Korycansky&rft.aufirst=D&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1522.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 13 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 27, 2012 N1 - Last updated - 2012-12-27 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - aggregate; asteroids; irradiation; mitigation; natural hazards; rubble-pile asteroids; simulation; velocity; X-rays ER - TY - JOUR T1 - Water Resources Research AN - 1244677873; 2013-008105 JF - Water Resources Research AU - Neuman, Shlomo P AU - Mishra, Phoolendra K Y1 - 2012 PY - 2012 DA - 2012 EP - Citation W02801 PB - American Geophysical Union, Washington, DC VL - 48 IS - 2 SN - 0043-1397, 0043-1397 KW - drawdown KW - numerical models KW - pumping KW - equations KW - preferential flow KW - unconfined aquifers KW - ground water KW - aquifers KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244677873?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Water+Resources+Research&rft.au=Neuman%2C+Shlomo+P%3BMishra%2C+Phoolendra+K&rft.aulast=Neuman&rft.aufirst=Shlomo&rft.date=2012-01-01&rft.volume=48&rft.issue=2&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1029%2F2011WR010785 L2 - http://www.agu.org/journals/wr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 12 N1 - PubXState - DC N1 - Document feature - illus. N1 - SuppNotes - For reference to original see Mao, D. L., et al., Water Resources Research, Vol. 47, W05502, 2011 N1 - Last updated - 2012-12-27 N1 - CODEN - WRERAQ N1 - SubjectsTermNotLitGenreText - aquifers; drawdown; equations; ground water; numerical models; preferential flow; pumping; unconfined aquifers DO - http://dx.doi.org/10.1029/2011WR010785 ER - TY - JOUR T1 - Revised tungsten isotope chronology of IVB iron meteorites from W-Os systematics AN - 1220564773; 2013-000440 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Wittig, N AU - Humayun, M AU - Huang, S AU - Brandon, A D AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1482 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - W-184/W-182 KW - magmatic iron meteorites KW - irradiation KW - isotopes KW - isotope ratios KW - calcium-aluminum inclusions KW - neutron capture KW - mass spectra KW - W-182 KW - platinum group KW - stable isotopes KW - early solar system KW - ICP mass spectra KW - meteorites KW - chronology KW - tungsten KW - iron meteorites KW - metals KW - inclusions KW - osmium KW - cosmic rays KW - spectra KW - IVB meteorites KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220564773?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Revised+tungsten+isotope+chronology+of+IVB+iron+meteorites+from+W-Os+systematics&rft.au=Wittig%2C+N%3BHumayun%2C+M%3BHuang%2C+S%3BBrandon%2C+A+D%3BAnonymous&rft.aulast=Wittig&rft.aufirst=N&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1482.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 12 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on June 22, 2012 N1 - Last updated - 2013-04-19 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - calcium-aluminum inclusions; chronology; cosmic rays; early solar system; ICP mass spectra; inclusions; iron meteorites; irradiation; isotope ratios; isotopes; IVB meteorites; magmatic iron meteorites; mass spectra; metals; meteorites; neutron capture; osmium; platinum group; spectra; stable isotopes; tungsten; W-182; W-184/W-182 ER - TY - JOUR T1 - A new upper limit on the D/H ratio in the solar wind AN - 1151916138; 2012-100264 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Huss, G R AU - Nagashima, K AU - Burnett, D S AU - Jurewicz, A J G AU - Olinger, C T AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1709 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - Genesis Mission KW - ion probe data KW - isotopes KW - isotope ratios KW - solar wind KW - mass spectra KW - stable isotopes KW - D/H KW - hydrogen KW - Sun KW - spectra KW - deuterium KW - spallation KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151916138?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=A+new+upper+limit+on+the+D%2FH+ratio+in+the+solar+wind&rft.au=Huss%2C+G+R%3BNagashima%2C+K%3BBurnett%2C+D+S%3BJurewicz%2C+A+J+G%3BOlinger%2C+C+T%3BAnonymous&rft.aulast=Huss&rft.aufirst=G&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1709.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 6 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on April 19, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - D/H; deuterium; Genesis Mission; hydrogen; ion probe data; isotope ratios; isotopes; mass spectra; solar wind; spallation; spectra; stable isotopes; Sun ER - TY - JOUR T1 - Isotope composition of atomic oxygen and branching ratio from CO predissociation; implications for oxygen isotope evolution in the early solar nebula AN - 1151913962; 2012-100273 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Shi, Xiaoyu AU - Yin, Qing-Zhu AU - Wiens, Roger AU - Ng, Cheuk-Yiu AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1403 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - vacuum ultraviolet KW - experimental studies KW - Genesis Mission KW - dissociation KW - oxygen KW - isotopes KW - solar wind KW - mass spectra KW - cosmochemistry KW - stable isotopes KW - ultraviolet radiation KW - nitrogen KW - early solar system KW - carbon monoxide KW - time-of-flight mass spectroscopy KW - chemical reactions KW - shelf-shielding KW - electromagnetic radiation KW - O-18 KW - O-17 KW - spectra KW - O-16 KW - real-time methods KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151913962?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Isotope+composition+of+atomic+oxygen+and+branching+ratio+from+CO+predissociation%3B+implications+for+oxygen+isotope+evolution+in+the+early+solar+nebula&rft.au=Shi%2C+Xiaoyu%3BYin%2C+Qing-Zhu%3BWiens%2C+Roger%3BNg%2C+Cheuk-Yiu%3BAnonymous&rft.aulast=Shi&rft.aufirst=Xiaoyu&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1403.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 18 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on April 19, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - carbon monoxide; chemical reactions; cosmochemistry; dissociation; early solar system; electromagnetic radiation; experimental studies; Genesis Mission; isotopes; mass spectra; nitrogen; O-16; O-17; O-18; oxygen; real-time methods; shelf-shielding; solar wind; spectra; stable isotopes; time-of-flight mass spectroscopy; ultraviolet radiation; vacuum ultraviolet ER - TY - JOUR T1 - InSight and single-station broadband seismology; from signal and noise to interior structure determination AN - 1151910422; 2012-100292 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Lognonne, P AU - Banerdt, W B AU - Hurst, K AU - Mimoun, D AU - Garcia, R AU - Lefeuvre, M AU - Gagnepain-Beyneix, J AU - Wiezorek, M AU - Mocquet, A AU - Panning, M AU - Beucler, E AU - Deraucourt, S AU - Giardini, D AU - Boschi, L AU - Christensen, U AU - Goetz, W AU - Pike, T AU - Johnson, C AU - Weber, R AU - Larmat, K AU - Kobayashi, N AU - Tromp, J AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1983 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - crust-mantle boundary KW - marsquakes KW - InSight Mission KW - mantle KW - Viking Program KW - Mars KW - elastic waves KW - seismographs KW - noise KW - terrestrial planets KW - planets KW - seismicity KW - planetary interiors KW - velocity KW - broad-band spectra KW - signal-to-noise ratio KW - instruments KW - crust KW - amplitude KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151910422?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=InSight+and+single-station+broadband+seismology%3B+from+signal+and+noise+to+interior+structure+determination&rft.au=Lognonne%2C+P%3BBanerdt%2C+W+B%3BHurst%2C+K%3BMimoun%2C+D%3BGarcia%2C+R%3BLefeuvre%2C+M%3BGagnepain-Beyneix%2C+J%3BWiezorek%2C+M%3BMocquet%2C+A%3BPanning%2C+M%3BBeucler%2C+E%3BDeraucourt%2C+S%3BGiardini%2C+D%3BBoschi%2C+L%3BChristensen%2C+U%3BGoetz%2C+W%3BPike%2C+T%3BJohnson%2C+C%3BWeber%2C+R%3BLarmat%2C+K%3BKobayashi%2C+N%3BTromp%2C+J%3BAnonymous&rft.aulast=Lognonne&rft.aufirst=P&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1983.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 12 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on May 11, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - amplitude; broad-band spectra; crust; crust-mantle boundary; elastic waves; InSight Mission; instruments; mantle; Mars; marsquakes; noise; planetary interiors; planets; seismicity; seismographs; signal-to-noise ratio; terrestrial planets; velocity; Viking Program ER - TY - JOUR T1 - ChemCam flight model calibration AN - 1151909566; 2012-098011 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Clegg, S M AU - Lasue, J AU - Forni, O AU - Bender, S AU - Wiens, R C AU - Maurice, S AU - Barraclough, B AU - Blaney, D AU - Cousin, Agnes AU - DeFlores, L AU - Delapp, D AU - Dyar, M D AU - Fabre, C AU - Gasnault, Olivier AU - Lanza, N AU - Morris, R V AU - Nelson, T AU - Newsom, H E AU - Ollila, A AU - Perez, R AU - Sautter, V AU - Vaniman, D T AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2076 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - laser-induced breakdown spectroscopy KW - laser methods KW - detection limit KW - data processing KW - Mars KW - calibration KW - multivariate analysis KW - Curiosity Rover KW - ChemCam KW - chemical analysis KW - precision KW - independent components analysis KW - statistical analysis KW - laser ablation KW - flight model KW - emission spectroscopy KW - terrestrial planets KW - planets KW - Mars Science Laboratory KW - corrections KW - spectroscopy KW - accuracy KW - instruments KW - remote sensing KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151909566?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=ChemCam+flight+model+calibration&rft.au=Clegg%2C+S+M%3BLasue%2C+J%3BForni%2C+O%3BBender%2C+S%3BWiens%2C+R+C%3BMaurice%2C+S%3BBarraclough%2C+B%3BBlaney%2C+D%3BCousin%2C+Agnes%3BDeFlores%2C+L%3BDelapp%2C+D%3BDyar%2C+M+D%3BFabre%2C+C%3BGasnault%2C+Olivier%3BLanza%2C+N%3BMorris%2C+R+V%3BNelson%2C+T%3BNewsom%2C+H+E%3BOllila%2C+A%3BPerez%2C+R%3BSautter%2C+V%3BVaniman%2C+D+T%3BAnonymous&rft.aulast=Clegg&rft.aufirst=S&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2076.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 7 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - accuracy; calibration; ChemCam; chemical analysis; corrections; Curiosity Rover; data processing; detection limit; emission spectroscopy; flight model; independent components analysis; instruments; laser ablation; laser methods; laser-induced breakdown spectroscopy; Mars; Mars Science Laboratory; multivariate analysis; planets; precision; remote sensing; spectroscopy; statistical analysis; terrestrial planets ER - TY - JOUR T1 - Deciphering sample and atmospheric oxygen contents with ChemCam on Mars AN - 1151909559; 2012-098010 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Gasnault, Olivier AU - Mazoyer, J AU - Cousin, Agnes AU - Meslin, P Y AU - Lasue, J AU - Lacour, J L AU - Ollila, A AU - Berger, G AU - Forni, O AU - Maurice, S AU - Wiens, R C AU - Clegg, S M AU - Blank, J G AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2888 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - chemical analysis KW - volcanic rocks KW - oxygen KW - laser-induced breakdown spectroscopy KW - laser methods KW - igneous rocks KW - laser ablation KW - atmosphere KW - Mars KW - calibration KW - emission spectroscopy KW - terrestrial planets KW - planets KW - Curiosity Rover KW - basalts KW - Mars Science Laboratory KW - ChemCam KW - spectroscopy KW - instruments KW - picrite KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151909559?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Deciphering+sample+and+atmospheric+oxygen+contents+with+ChemCam+on+Mars&rft.au=Gasnault%2C+Olivier%3BMazoyer%2C+J%3BCousin%2C+Agnes%3BMeslin%2C+P+Y%3BLasue%2C+J%3BLacour%2C+J+L%3BOllila%2C+A%3BBerger%2C+G%3BForni%2C+O%3BMaurice%2C+S%3BWiens%2C+R+C%3BClegg%2C+S+M%3BBlank%2C+J+G%3BAnonymous&rft.aulast=Gasnault&rft.aufirst=Olivier&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2888.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 13 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - atmosphere; basalts; calibration; ChemCam; chemical analysis; Curiosity Rover; emission spectroscopy; igneous rocks; instruments; laser ablation; laser methods; laser-induced breakdown spectroscopy; Mars; Mars Science Laboratory; oxygen; picrite; planets; spectroscopy; terrestrial planets; volcanic rocks ER - TY - JOUR T1 - Classification of non-homogeneous basalts using independent component analysis technique for MSL/ChemCam data AN - 1151909552; 2012-098009 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Cousin, Agnes AU - Forni, O AU - Sautter, V AU - Fabre, C AU - Maurice, S AU - Gasnault, Olivier AU - Wiens, R C AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2891 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - silicates KW - volcanic rocks KW - igneous rocks KW - olivine group KW - Mars KW - emission spectra KW - laboratory studies KW - pyroxene group KW - mineral composition KW - olivine KW - basalts KW - orthosilicates KW - LIBS spectra KW - ChemCam KW - framework silicates KW - spectra KW - heterogeneity KW - chemical composition KW - chain silicates KW - plagioclase KW - independent component analysis KW - textures KW - grain size KW - terrestrial planets KW - nesosilicates KW - planets KW - heterogeneous materials KW - porphyritic texture KW - classification KW - Mars Science Laboratory KW - feldspar group KW - phenocrysts KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151909552?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Classification+of+non-homogeneous+basalts+using+independent+component+analysis+technique+for+MSL%2FChemCam+data&rft.au=Cousin%2C+Agnes%3BForni%2C+O%3BSautter%2C+V%3BFabre%2C+C%3BMaurice%2C+S%3BGasnault%2C+Olivier%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Cousin&rft.aufirst=Agnes&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2891.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 14 N1 - PubXState - TX N1 - Document feature - illus. incl. 2 tables N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - basalts; chain silicates; ChemCam; chemical composition; classification; emission spectra; feldspar group; framework silicates; grain size; heterogeneity; heterogeneous materials; igneous rocks; independent component analysis; laboratory studies; LIBS spectra; Mars; Mars Science Laboratory; mineral composition; nesosilicates; olivine; olivine group; orthosilicates; phenocrysts; plagioclase; planets; porphyritic texture; pyroxene group; silicates; spectra; terrestrial planets; textures; volcanic rocks ER - TY - JOUR T1 - ChemCam LIBS; a powerful tool for textural comparison of the DaG 476 Meteorite and picritic basalt AN - 1151909550; 2012-098008 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Cousin, Agnes AU - Sautter, V AU - Fabre, C AU - Maurice, S AU - Wiens, R C AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1841 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - Chemistry Camera KW - volcanic rocks KW - stony meteorites KW - Martian meteorites KW - igneous rocks KW - DaG 476 KW - Mars KW - emission spectra KW - SNC Meteorites KW - meteorites KW - laboratory studies KW - Dar al Gani Meteorites KW - basalts KW - LIBS spectra KW - ChemCam KW - spectra KW - chemical ratios KW - picrite KW - textures KW - grain size KW - achondrites KW - terrestrial planets KW - planets KW - shergottite KW - Mars Science Laboratory KW - testing KW - phenocrysts KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151909550?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=ChemCam+LIBS%3B+a+powerful+tool+for+textural+comparison+of+the+DaG+476+Meteorite+and+picritic+basalt&rft.au=Cousin%2C+Agnes%3BSautter%2C+V%3BFabre%2C+C%3BMaurice%2C+S%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Cousin&rft.aufirst=Agnes&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1841.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 11 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - achondrites; basalts; ChemCam; chemical ratios; Chemistry Camera; DaG 476; Dar al Gani Meteorites; emission spectra; grain size; igneous rocks; laboratory studies; LIBS spectra; Mars; Mars Science Laboratory; Martian meteorites; meteorites; phenocrysts; picrite; planets; shergottite; SNC Meteorites; spectra; stony meteorites; terrestrial planets; testing; textures; volcanic rocks ER - TY - JOUR T1 - Operational strategies for the ChemCam LIBS experiment on MSL AN - 1151909545; 2012-098007 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Newsom, H E AU - Blaney, D AU - Wiens, R C AU - Clegg, S M AU - Lanza, N AU - Vaniman, D T AU - Maurice, S AU - Gasnault, Olivier AU - King, P AU - Bridges, N T AU - Dyar, M D AU - Melikechi, N AU - Blank, J G AU - Cousin, Agnes AU - Ollila, A AU - Baxter, A AU - Vasavada, A AU - Mangold, N AU - Le Mouelic, S AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2477 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - chemical analysis KW - laser-induced breakdown spectroscopy KW - laser methods KW - characterization KW - Mars KW - depth KW - emission spectroscopy KW - terrestrial planets KW - Alpha Proton X-ray Spectrometer KW - planets KW - alpha-ray spectroscopy KW - sampling KW - planning KW - fine-grained materials KW - Mars Science Laboratory KW - depth profiling KW - ChemCam KW - spectroscopy KW - accuracy KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151909545?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Operational+strategies+for+the+ChemCam+LIBS+experiment+on+MSL&rft.au=Newsom%2C+H+E%3BBlaney%2C+D%3BWiens%2C+R+C%3BClegg%2C+S+M%3BLanza%2C+N%3BVaniman%2C+D+T%3BMaurice%2C+S%3BGasnault%2C+Olivier%3BKing%2C+P%3BBridges%2C+N+T%3BDyar%2C+M+D%3BMelikechi%2C+N%3BBlank%2C+J+G%3BCousin%2C+Agnes%3BOllila%2C+A%3BBaxter%2C+A%3BVasavada%2C+A%3BMangold%2C+N%3BLe+Mouelic%2C+S%3BAnonymous&rft.aulast=Newsom&rft.aufirst=H&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2477.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 11 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - accuracy; Alpha Proton X-ray Spectrometer; alpha-ray spectroscopy; characterization; ChemCam; chemical analysis; depth; depth profiling; emission spectroscopy; fine-grained materials; instruments; laser methods; laser-induced breakdown spectroscopy; Mars; Mars Science Laboratory; planets; planning; sampling; spectroscopy; terrestrial planets ER - TY - JOUR T1 - Behavior of feature selection in LIBS spectroscopy as a function of varying distance and data pre-processing AN - 1151908896; 2012-098020 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Carmosino, M L AU - Breves, E A AU - Dyar, M D AU - Ozanne, M V AU - Clegg, S M AU - Wiens, R C AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2285 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - laser-induced breakdown spectroscopy KW - data processing KW - Mars KW - calibration KW - LASSO regression KW - laboratory studies KW - multivariate analysis KW - standard materials KW - Curiosity Rover KW - ChemCam KW - chemical analysis KW - statistical analysis KW - noise KW - least-squares analysis KW - emission spectroscopy KW - wavelength KW - terrestrial planets KW - computer programs KW - planets KW - Mars Science Laboratory KW - spectroscopy KW - regression analysis KW - instruments KW - remote sensing KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151908896?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Behavior+of+feature+selection+in+LIBS+spectroscopy+as+a+function+of+varying+distance+and+data+pre-processing&rft.au=Carmosino%2C+M+L%3BBreves%2C+E+A%3BDyar%2C+M+D%3BOzanne%2C+M+V%3BClegg%2C+S+M%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Carmosino&rft.aufirst=M&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2285.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 9 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - calibration; ChemCam; chemical analysis; computer programs; Curiosity Rover; data processing; emission spectroscopy; instruments; laboratory studies; laser-induced breakdown spectroscopy; LASSO regression; least-squares analysis; Mars; Mars Science Laboratory; multivariate analysis; noise; planets; regression analysis; remote sensing; spectroscopy; standard materials; statistical analysis; terrestrial planets; wavelength ER - TY - JOUR T1 - Laser induced breakdown spectroscopy (LIBS) spot size at stand-off distances with ChemCam AN - 1151908890; 2012-098019 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Maurice, Sylvestre AU - Cousin, Agnes AU - Wiens, R C AU - Gasnault, Olivier AU - Pares, L AU - Forni, O AU - Meslin, P Y AU - Clegg, S M AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2899 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - chemical analysis KW - laser-induced breakdown spectroscopy KW - laser methods KW - telescope methods KW - laser ablation KW - Mars KW - size KW - measurement KW - geometry KW - emission spectroscopy KW - diffraction KW - wavelength KW - terrestrial planets KW - planets KW - Mars Science Laboratory KW - ChemCam KW - spectroscopy KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151908890?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Laser+induced+breakdown+spectroscopy+%28LIBS%29+spot+size+at+stand-off+distances+with+ChemCam&rft.au=Maurice%2C+Sylvestre%3BCousin%2C+Agnes%3BWiens%2C+R+C%3BGasnault%2C+Olivier%3BPares%2C+L%3BForni%2C+O%3BMeslin%2C+P+Y%3BClegg%2C+S+M%3BAnonymous&rft.aulast=Maurice&rft.aufirst=Sylvestre&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2899.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 15 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - ChemCam; chemical analysis; diffraction; emission spectroscopy; geometry; instruments; laser ablation; laser methods; laser-induced breakdown spectroscopy; Mars; Mars Science Laboratory; measurement; planets; size; spectroscopy; telescope methods; terrestrial planets; wavelength ER - TY - JOUR T1 - Comparison of LASSO and elastic net regression for major element analysis of rocks using laser-induced breakdown spectroscopy (LIBS) AN - 1151908879; 2012-098018 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Ozanne, M V AU - Dyar, M D AU - Carmosino, M L AU - Breves, E A AU - Clegg, S M AU - Wiens, R C AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2391 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - chemical analysis KW - laser-induced breakdown spectroscopy KW - least absolute shrinkage and selection operator regression KW - statistical analysis KW - Mars KW - LASSO regression KW - elastic net regression KW - noise KW - least-squares analysis KW - emission spectroscopy KW - terrestrial planets KW - models KW - planets KW - errors KW - major elements KW - quantitative analysis KW - Curiosity Rover KW - Mars Science Laboratory KW - spectroscopy KW - regression analysis KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151908879?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Comparison+of+LASSO+and+elastic+net+regression+for+major+element+analysis+of+rocks+using+laser-induced+breakdown+spectroscopy+%28LIBS%29&rft.au=Ozanne%2C+M+V%3BDyar%2C+M+D%3BCarmosino%2C+M+L%3BBreves%2C+E+A%3BClegg%2C+S+M%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Ozanne&rft.aufirst=M&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2391.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 6 N1 - PubXState - TX N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - chemical analysis; Curiosity Rover; elastic net regression; emission spectroscopy; errors; laser-induced breakdown spectroscopy; LASSO regression; least absolute shrinkage and selection operator regression; least-squares analysis; major elements; Mars; Mars Science Laboratory; models; noise; planets; quantitative analysis; regression analysis; spectroscopy; statistical analysis; terrestrial planets ER - TY - JOUR T1 - ChemCam education and public outreach; zapping the public awareness of ChemCam, the Mars Science Laboratory, and Mars science and exploration AN - 1151908755; 2012-098033 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Shaner, A J AU - Shipp, S S AU - Wiens, R C AU - Maurice, S AU - Gasnault, Olivier AU - Newsom, H E AU - Anderson, R B AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 2835 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - laser methods KW - public awareness KW - laser ablation KW - Mars KW - education KW - teacher education KW - terrestrial planets KW - planets KW - Curiosity Rover KW - Mars Science Laboratory KW - ChemCam KW - Chemistry and Camera instrument KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151908755?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=ChemCam+education+and+public+outreach%3B+zapping+the+public+awareness+of+ChemCam%2C+the+Mars+Science+Laboratory%2C+and+Mars+science+and+exploration&rft.au=Shaner%2C+A+J%3BShipp%2C+S+S%3BWiens%2C+R+C%3BMaurice%2C+S%3BGasnault%2C+Olivier%3BNewsom%2C+H+E%3BAnderson%2C+R+B%3BAnonymous&rft.aulast=Shaner&rft.aufirst=A&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/2835.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Sept. 21, 2012 N1 - Last updated - 2012-11-15 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - ChemCam; Chemistry and Camera instrument; Curiosity Rover; education; instruments; laser ablation; laser methods; Mars; Mars Science Laboratory; planets; public awareness; teacher education; terrestrial planets ER - TY - JOUR T1 - Standoff bio-finder for planetary exploration with fast detection AN - 1124740599; 2012-093991 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Misra, A K AU - Sharma, S K AU - Acosta, T E AU - Bates, D E AU - Clegg, S AU - Wiens, R C AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1666 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - imagery KW - experimental studies KW - astrobiology KW - standoff bio-finder instrument KW - planetary exploration KW - biomarkers KW - time-resolved fluorescence spectroscopy KW - planets KW - laboratory studies KW - detection KW - fluorescence KW - spectroscopy KW - instruments KW - remote sensing KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1124740599?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Standoff+bio-finder+for+planetary+exploration+with+fast+detection&rft.au=Misra%2C+A+K%3BSharma%2C+S+K%3BAcosta%2C+T+E%3BBates%2C+D+E%3BClegg%2C+S%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Misra&rft.aufirst=A&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/lpsc2012/pdf/1666.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 10 N1 - PubXState - TX N1 - Document feature - illus. N1 - SuppNotes - Accessed on Aug. 17, 2012 N1 - Last updated - 2012-11-01 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - astrobiology; biomarkers; detection; experimental studies; fluorescence; imagery; instruments; laboratory studies; planetary exploration; planets; remote sensing; spectroscopy; standoff bio-finder instrument; time-resolved fluorescence spectroscopy ER - TY - JOUR T1 - "At scale" author name matching with Hadoop/MapReduce AN - 1081858506; 201210124 AB - Purpose -- The purpose of this paper is to describe a process for extracting and matching author names from large collections of bibliographic metadata using the Hadoop implementation of MapReduce. It considers the challenges and risks associated with name matching on such a large-scale and proposes simple matching heuristics for the reduce process. The resulting semantic graphs of authors link names to publications, and include additional features such as phonetic representations of author last names. The authors believe that this achieves an appropriate level of matching at scale, and enables further matching to be performed with graph analysis tools. Design/methodology/approach -- A topically-focused collection of metadata records describing peer-reviewed papers was generated based upon a search. The matching records were harvested and stored in the Hadoop Distributed File System (HDFS) for processing by hadoop. A MapReduce job was written to perform coarse-grain author name matching, and multiple papers were matched with authors when the names were very similar or identical. Semantic graphs were generated so that the graphs could be analyzed to perform finer grained matching, for example by using other metadata such as subject headings. Findings -- When performing author name matching at scale using MapReduce, the heuristics that determine whether names match should be limited to the rules that yield the most reliable results for matching. Bad rules will result in lots of errors, at scale. MapReduce can also be used to generate or extract other data that might help resolve similar names when stricter rules fail to do so. The authors also found that matching is more reliable within a well-defined topic domain. Originality/value -- Libraries have some of the same big data challenges as are found in data-driven science. Big data tools such as hadoop can be used to explore large metadata collections, and these collections can be used as surrogates for other real world, big data problems. MapReduce activities need to be appropriately scoped so as to yield good results, while keeping an eye out for problems in code which can be magnified in the output from a MapReduce job. Adapted from the source document. JF - Library Hi Tech News AU - Powell, James AU - Collins, Linn AU - Eberhardt, Ariane AU - Izraelevitz, David AU - Roman, Jorge AU - Dufresne, Thomas AU - Scott, Mark AU - Blake, Miriam AU - Grider, Gary AD - Research Library, Los Alamos National Laboratory, Los Alamos, New Mexico, USA Y1 - 2012///0, PY - 2012 DA - 0, 2012 SP - 6 EP - 12 PB - Emerald Group Publishing Ltd., Bradford UK VL - 29 IS - 4 SN - 0741-9058, 0741-9058 KW - Computer systems KW - Information systems KW - Libraries KW - Metadata KW - Bibliographies KW - Research KW - Data mining KW - Authors KW - Names KW - Matching KW - article KW - 13.13: AUTOMATIC TEXT ANALYSIS, AUTOMATIC INDEXING, MACHINE TRANSLATION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1081858506?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Library+Hi+Tech+News&rft.atitle=%22At+scale%22+author+name+matching+with+Hadoop%2FMapReduce&rft.au=Powell%2C+James%3BCollins%2C+Linn%3BEberhardt%2C+Ariane%3BIzraelevitz%2C+David%3BRoman%2C+Jorge%3BDufresne%2C+Thomas%3BScott%2C+Mark%3BBlake%2C+Miriam%3BGrider%2C+Gary&rft.aulast=Powell&rft.aufirst=James&rft.date=2012-01-01&rft.volume=29&rft.issue=4&rft.spage=6&rft.isbn=&rft.btitle=&rft.title=Library+Hi+Tech+News&rft.issn=07419058&rft_id=info:doi/10.1108%2F07419051211249455 L2 - http://www.emeraldinsight.com/info/journals/lhtn/lhtn.jsp LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2012-10-01 N1 - Last updated - 2016-09-27 N1 - SubjectsTermNotLitGenreText - Matching; Data mining; Authors; Names; Metadata; Information systems DO - http://dx.doi.org/10.1108/07419051211249455 ER - TY - JOUR T1 - Seasonal dynamics of water drainage in a lake underlain by through-going talik AN - 1080610301; 2012-083981 JF - International Conference on Permafrost (ICOP) Proceedings AU - Rowland, J C AU - Travis, B J AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 476 EP - 477 PB - [publisher varies], [location varies] VL - 10, Volume 4 KW - soils KW - hydrology KW - lacustrine features KW - permafrost KW - lakes KW - periglacial features KW - models KW - thermokarst KW - hydrodynamics KW - seasonal variations KW - geomorphology KW - frozen ground KW - taliks KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080610301?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Conference+on+Permafrost+%28ICOP%29+Proceedings&rft.atitle=Seasonal+dynamics+of+water+drainage+in+a+lake+underlain+by+through-going+talik&rft.au=Rowland%2C+J+C%3BTravis%2C+B+J%3BAnonymous&rft.aulast=Rowland&rft.aufirst=J&rft.date=2012-01-01&rft.volume=10%2C+Volume+4&rft.issue=&rft.spage=476&rft.isbn=9785911280505&rft.btitle=&rft.title=International+Conference+on+Permafrost+%28ICOP%29+Proceedings&rft.issn=&rft_id=info:doi/ L2 - http://ipa.arcticportal.org/meetings/international-conferences.html LA - English DB - GeoRef N1 - Conference title - Tenth international conference on Permafrost N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 4 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-09-27 N1 - CODEN - #00164 N1 - SubjectsTermNotLitGenreText - frozen ground; geomorphology; hydrodynamics; hydrology; lacustrine features; lakes; models; periglacial features; permafrost; seasonal variations; soils; taliks; thermokarst ER - TY - JOUR T1 - Multiscale Bayesian fusion approach using geophysical and remote sensing data for characterizing Arctic tundra hydrogeochemical properties AN - 1080608640; 2012-084061 JF - International Conference on Permafrost (ICOP) Proceedings AU - Wainwright, H M AU - Hubbard, S S AU - Dafflon, B AU - Ulrich, C AU - Wu, Y AU - Gangodagamage, C AU - Rowland, J AU - Wilson, C AU - Tweedie, C AU - Wullschleger, S D AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 630 EP - 631 PB - [publisher varies], [location varies] VL - 10, Volume 4 KW - United States KW - soils KW - hydrology KW - permafrost KW - laser methods KW - geophysical surveys KW - Bayesian analysis KW - tundra KW - Arctic region KW - statistical analysis KW - geophysical methods KW - radar methods KW - Barrow Alaska KW - temperature KW - lidar methods KW - ice KW - surveys KW - ground ice KW - Alaska KW - active layer KW - frozen ground KW - 21:Hydrogeology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080608640?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Conference+on+Permafrost+%28ICOP%29+Proceedings&rft.atitle=Multiscale+Bayesian+fusion+approach+using+geophysical+and+remote+sensing+data+for+characterizing+Arctic+tundra+hydrogeochemical+properties&rft.au=Wainwright%2C+H+M%3BHubbard%2C+S+S%3BDafflon%2C+B%3BUlrich%2C+C%3BWu%2C+Y%3BGangodagamage%2C+C%3BRowland%2C+J%3BWilson%2C+C%3BTweedie%2C+C%3BWullschleger%2C+S+D%3BAnonymous&rft.aulast=Wainwright&rft.aufirst=H&rft.date=2012-01-01&rft.volume=10%2C+Volume+4&rft.issue=&rft.spage=630&rft.isbn=9785911280566&rft.btitle=&rft.title=International+Conference+on+Permafrost+%28ICOP%29+Proceedings&rft.issn=&rft_id=info:doi/ L2 - http://ipa.arcticportal.org/meetings/international-conferences.html LA - English DB - GeoRef N1 - Conference title - Tenth international conference on Permafrost N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 3 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-09-27 N1 - CODEN - #00164 N1 - SubjectsTermNotLitGenreText - active layer; Alaska; Arctic region; Barrow Alaska; Bayesian analysis; frozen ground; geophysical methods; geophysical surveys; ground ice; hydrology; ice; laser methods; lidar methods; permafrost; radar methods; soils; statistical analysis; surveys; temperature; tundra; United States ER - TY - JOUR T1 - Next-Generation Ecosystem Experiment (NGEE Arctic); a new project focused on improved climate prediction AN - 1039340180; 2012-082062 JF - International Conference on Permafrost (ICOP) Proceedings AU - Hinzman, Larry D AU - Wilson, Cathy J AU - Rowland, Joel C AU - Hubbard, Susan S AU - Torn, Margaret S AU - Riley, William J AU - Wullschleger, Stan D AU - Graham, David E AU - Liang, Liyuan AU - Norby, Richard J AU - Thornton, Peter E AU - Rogers, Alistair AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 SP - 213 EP - 214 PB - [publisher varies], [location varies] VL - 10, Volume 4 KW - soils KW - hydrology KW - permafrost KW - degradation KW - Arctic region KW - prediction KW - thermal regime KW - climate change KW - temperature KW - ice KW - climate effects KW - Arctic Ocean KW - ground ice KW - active layer KW - frozen ground KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1039340180?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Conference+on+Permafrost+%28ICOP%29+Proceedings&rft.atitle=Next-Generation+Ecosystem+Experiment+%28NGEE+Arctic%29%3B+a+new+project+focused+on+improved+climate+prediction&rft.au=Hinzman%2C+Larry+D%3BWilson%2C+Cathy+J%3BRowland%2C+Joel+C%3BHubbard%2C+Susan+S%3BTorn%2C+Margaret+S%3BRiley%2C+William+J%3BWullschleger%2C+Stan+D%3BGraham%2C+David+E%3BLiang%2C+Liyuan%3BNorby%2C+Richard+J%3BThornton%2C+Peter+E%3BRogers%2C+Alistair%3BAnonymous&rft.aulast=Hinzman&rft.aufirst=Larry&rft.date=2012-01-01&rft.volume=10%2C+Volume+4&rft.issue=&rft.spage=213&rft.isbn=9785911280505&rft.btitle=&rft.title=International+Conference+on+Permafrost+%28ICOP%29+Proceedings&rft.issn=&rft_id=info:doi/ L2 - http://ipa.arcticportal.org/meetings/international-conferences.html LA - English DB - GeoRef N1 - Conference title - Tenth international conference on Permafrost N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 3 N1 - Document feature - illus. N1 - Last updated - 2012-09-14 N1 - CODEN - #00164 N1 - SubjectsTermNotLitGenreText - active layer; Arctic Ocean; Arctic region; climate change; climate effects; degradation; frozen ground; ground ice; hydrology; ice; permafrost; prediction; soils; temperature; thermal regime ER - TY - JOUR T1 - Measuring the uncertainties of pandemic influenza AN - 1034821494; 17048118 AB - It has become critical to assess the potential range of consequences of a pandemic influenza outbreak given the uncertainty about its disease characteristics while investigating risks and mitigation strategies of vaccines, antivirals, and social distancing measures. Here, we use a simulation model and rigorous experimental design with sensitivity analysis that incorporates uncertainty in the pathogen behaviour and epidemic response to show the extreme variation in the consequences of a potential pandemic outbreak in the USA. Using sensitivity analysis we found the most important disease characteristics are the fraction of the transmission that occur prior to symptoms, the reproductive number, and the length of each disease stage. Using data from the historical pandemics and for potential viral evolution, we show that response planning may underestimate the pandemic consequences by a factor of two or more. JF - International Journal of Risk Assessment & Management AU - Fair, Jeanne M AU - Powell, Dennis R AU - LeClaire, Rene J AU - Moore, Leslie M AU - Wilson, Michael L AU - Dauelsberg, Lori R AU - Samsa, Michael E AU - DeLand, Sharon M AU - Hirsch, Gary AU - Bush, Brian W AD - Biosecurity and Public Health, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. Y1 - 2012 PY - 2012 DA - 2012 SP - 1 EP - 27 PB - Inderscience Publishers Ltd., PO Box 735 Olney Bucks MK46 5WB United Kingdom VL - 16 IS - 1-2-3 SN - 1466-8297, 1466-8297 KW - Virology & AIDS Abstracts; Sustainability Science Abstracts; Risk Abstracts KW - RISK, SAFETY AND EMERGENCY MANAGEMENT KW - Risk, Reliability and Safety KW - Security and Emergency Management KW - Risk assessment KW - Historical account KW - Mitigation KW - Data processing KW - Epidemics KW - Simulation KW - Pathogens KW - Models KW - Disease transmission KW - Influenza KW - USA KW - pandemics KW - Sensitivity analysis KW - Outbreaks KW - Vaccines KW - Evolution KW - M3 1010:Issues in Sustainable Development KW - R2 23060:Medical and environmental health KW - V 22310:Genetics, Taxonomy & Structure UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1034821494?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Journal+of+Risk+Assessment+%26+Management&rft.atitle=Measuring+the+uncertainties+of+pandemic+influenza&rft.au=Fair%2C+Jeanne+M%3BPowell%2C+Dennis+R%3BLeClaire%2C+Rene+J%3BMoore%2C+Leslie+M%3BWilson%2C+Michael+L%3BDauelsberg%2C+Lori+R%3BSamsa%2C+Michael+E%3BDeLand%2C+Sharon+M%3BHirsch%2C+Gary%3BBush%2C+Brian+W&rft.aulast=Fair&rft.aufirst=Jeanne&rft.date=2012-01-01&rft.volume=16&rft.issue=1-2-3&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=International+Journal+of+Risk+Assessment+%26+Management&rft.issn=14668297&rft_id=info:doi/10.1504%2FIJRAM.2012.047550 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-08-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Risk assessment; Influenza; pandemics; Epidemics; Data processing; Vaccines; Pathogens; Evolution; Disease transmission; Models; Historical account; Mitigation; Sensitivity analysis; Simulation; Outbreaks; USA DO - http://dx.doi.org/10.1504/IJRAM.2012.047550 ER - TY - JOUR T1 - Ion trajectory simulations of the Genesis Solar Wind Concentrator; Li, C, Mg, S AN - 1033532483; 2012-072852 JF - Abstracts of Papers Submitted to the Lunar and Planetary Science Conference AU - Wiens, R C AU - Olinger, C T AU - Reisenfeld, D B AU - Heber, V S AU - Burnett, D S AU - Anonymous Y1 - 2012 PY - 2012 DA - 2012 EP - Abstract 1369 PB - Lunar and Planetary Science Conference, Houston, TX VL - 43 KW - isotope fractionation KW - alkaline earth metals KW - magnesium KW - Genesis Mission KW - isotopes KW - lithium KW - isotope ratios KW - C-13/C-12 KW - solar wind KW - alkali metals KW - trajectories KW - simulation KW - ions KW - stable isotopes KW - photosphere KW - S-34/S-32 KW - Mg-26/Mg-24 KW - metals KW - carbon KW - Sun KW - sulfur KW - Li-7/Li-6 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1033532483?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.atitle=Ion+trajectory+simulations+of+the+Genesis+Solar+Wind+Concentrator%3B+Li%2C+C%2C+Mg%2C+S&rft.au=Wiens%2C+R+C%3BOlinger%2C+C+T%3BReisenfeld%2C+D+B%3BHeber%2C+V+S%3BBurnett%2C+D+S%3BAnonymous&rft.aulast=Wiens&rft.aufirst=R&rft.date=2012-01-01&rft.volume=43&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Abstracts+of+Papers+Submitted+to+the+Lunar+and+Planetary+Science+Conference&rft.issn=&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/lpsc2012/pdf/1369.pdf LA - English DB - GeoRef N1 - Conference title - Forty-third lunar and planetary science conference N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 23 N1 - PubXState - TX N1 - Document feature - 1 table N1 - SuppNotes - Accessed on June 8, 2012 N1 - Last updated - 2012-08-16 N1 - CODEN - #02179 N1 - SubjectsTermNotLitGenreText - alkali metals; alkaline earth metals; C-13/C-12; carbon; Genesis Mission; ions; isotope fractionation; isotope ratios; isotopes; Li-7/Li-6; lithium; magnesium; metals; Mg-26/Mg-24; photosphere; S-34/S-32; simulation; solar wind; stable isotopes; sulfur; Sun; trajectories ER - TY - JOUR T1 - Hydrodynamic stagnation zones; a new play concept for the Llanos Basin, Colombia AN - 1033532143; 2012-059277 AB - Hydraulic heads from a calibrated, three-dimensional, constant-density, ground-water-flow model were used to compute Hubbert oil potentials and infer secondary petroleum migration directions within the Llanos Basin, Colombia. The oil potentials for the C7 reservoir show evidence of the development of two hydrodynamic stagnation zones. Hydrodynamic effects on secondary oil migration are greatest in the eastern Llanos Basin, where structural slopes are lowest and local hydraulic-head gradients drive ground-water flow westward down structural dip. The Rubiales field, a large oil reservoir within the eastern Llanos Basin with no structural closure, is located at the edge of one of these stagnation zones. This oil field hosts heavy oils (12 degrees API) consistent with water washing and biodegradation. The best agreement between model results and field conditions occurred in an oil density of 12 degrees API, suggesting that the Rubiales field position is in dynamic equilibrium with modern hydraulic and oil density conditions. Cross sectional ground-water-flow models indicate that the most likely explanation of observed underpressures are caused by hydrodynamic effects associated with a topography-driven flow system. Late Miocene to present-day ground-water flow likely was an important factor in flushing marine connate porewaters from Tertiary reservoirs. Ground-water recharge along the western margin of the basin could help explain the observed low-temperature gradients (20 degrees C/km). However, upward flow rates were not high enough to account for elevated temperature gradients of 50 degrees C/km to the east. JF - AAPG Bulletin AU - Person, Mark AU - Butler, David AU - Gable, Carl W AU - Villamil, Tomas AU - Wavrek, David AU - Schelling, Daniel Y1 - 2012/01// PY - 2012 DA - January 2012 SP - 23 EP - 41 PB - American Association of Petroleum Geologists, Tulsa, OK VL - 96 IS - 1 SN - 0149-1423, 0149-1423 KW - solute transport KW - regression KW - petroleum KW - Colombia KW - oil and gas fields KW - reservoir rocks KW - ground water KW - Cenozoic KW - transgression KW - transport KW - heat flow KW - movement KW - hydrodynamics KW - geothermal gradient KW - secondary migration KW - biodegradation KW - pressure KW - three-dimensional models KW - equations KW - Rubiales Field KW - Llanos KW - porosity KW - Mesozoic KW - models KW - Tertiary KW - South America KW - sea-level changes KW - recharge KW - pore water KW - permeability KW - 29A:Economic geology, geology of energy sources KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1033532143?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=AAPG+Bulletin&rft.atitle=Hydrodynamic+stagnation+zones%3B+a+new+play+concept+for+the+Llanos+Basin%2C+Colombia&rft.au=Person%2C+Mark%3BButler%2C+David%3BGable%2C+Carl+W%3BVillamil%2C+Tomas%3BWavrek%2C+David%3BSchelling%2C+Daniel&rft.aulast=Person&rft.aufirst=Mark&rft.date=2012-01-01&rft.volume=96&rft.issue=1&rft.spage=23&rft.isbn=&rft.btitle=&rft.title=AAPG+Bulletin&rft.issn=01491423&rft_id=info:doi/10.1306%2F08101111019 L2 - http://aapgbull.geoscienceworld.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 50 N1 - PubXState - OK N1 - Document feature - illus. incl. block diags., sects., 2 tables, sketch maps N1 - SuppNotes - Includes appendix N1 - Last updated - 2012-08-16 N1 - CODEN - AABUD2 N1 - SubjectsTermNotLitGenreText - biodegradation; Cenozoic; Colombia; equations; geothermal gradient; ground water; heat flow; hydrodynamics; Llanos; Mesozoic; models; movement; oil and gas fields; permeability; petroleum; pore water; porosity; pressure; recharge; regression; reservoir rocks; Rubiales Field; sea-level changes; secondary migration; solute transport; South America; Tertiary; three-dimensional models; transgression; transport DO - http://dx.doi.org/10.1306/08101111019 ER - TY - JOUR T1 - Variable selection for high dimensional Bayesian density estimation: application to human exposure simulation AN - 1021121455; 4305254 AB - Numerous studies have linked ambient air pollution and adverse health outcomes. Many studies of this nature relate outdoor pollution levels measured at a few monitoring stations with health outcomes. Recently, computational methods have been developed to model the distribution of personal exposures, rather than ambient concentration, and then relate the exposure distribution to the health outcome. Although these methods show great promise, they are limited by the computational demands of the exposure model. We propose a method to alleviate these computational burdens with the eventual goal of implementing a national study of the health effects of air pollution exposure. Our approach is to develop a statistical emulator for the exposure model, i.e. we use Bayesian density estimation to predict the conditional exposure distribution as a function of several variables, such as temperature, human activity and physical characteristics of the pollutant. This poses a challenging statistical problem because there are many predictors of the exposure distribution and density estimation is notoriously difficult in high dimensions. To overcome this challenge, we use stochastic search variable selection to identify a subset of the variables that have more than just additive effects on the mean of the exposure distribution. We apply our method to emulate an ozone exposure model in Philadelphia. Reprinted by permission of Blackwell Publishers JF - Journal of the Royal Statistical Society AU - Reich, Brian J AU - Kalendra, Eric AU - Storlie, Curtis B AU - Bondell, Howard D AU - Fuentes, Montserrat AD - North Carolina State University ; Los Alamos National Laboratory Y1 - 2012/01// PY - 2012 DA - Jan 2012 SP - 47 EP - 66 VL - 61 IS - 1 SN - 0035-9254, 0035-9254 KW - Economics KW - Air pollution KW - Stochastic models KW - Pollution levels KW - Computational methods KW - Health KW - Estimation KW - Bayesian method UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1021121455?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aibss&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+the+Royal+Statistical+Society&rft.atitle=Variable+selection+for+high+dimensional+Bayesian+density+estimation%3A+application+to+human+exposure+simulation&rft.au=Reich%2C+Brian+J%3BKalendra%2C+Eric%3BStorlie%2C+Curtis+B%3BBondell%2C+Howard+D%3BFuentes%2C+Montserrat&rft.aulast=Reich&rft.aufirst=Brian&rft.date=2012-01-01&rft.volume=61&rft.issue=1&rft.spage=47&rft.isbn=&rft.btitle=&rft.title=Journal+of+the+Royal+Statistical+Society&rft.issn=00359254&rft_id=info:doi/ LA - English DB - International Bibliography of the Social Sciences (IBSS) N1 - Date revised - 2013-06-12 N1 - Last updated - 2013-09-16 N1 - SubjectsTermNotLitGenreText - 891 9818; 1512 3865 4025; 4403 7854; 5772; 12263 8163; 2671 10919; 9823 9818 ER - TY - JOUR T1 - Reformulating the full-Stokes ice sheet model for a more efficient computational solution AN - 1017982242; 16735884 AB - The first-order or Blatter-Pattyn ice sheet model, in spite of its approximate nature, is an attractive alternative to the full Stokes model in many applications because of its reduced computational demands. In contrast, the unap-proximated Stokes ice sheet model is more difficult to solve and computationally more expensive. This is primarily due to the fact that the Stokes model is indefinite and involves all three velocity components, as well as the pressure, while the Blatter-Pattyn discrete model is positive-definite and involves just the horizontal velocity components. The Stokes model is indefinite because it arises from a constrained minimization principle where the pressure acts as a Lagrange multiplier to enforce incompressibility. To alleviate these problems we reformulate the full Stokes problem into an unconstrained, positive-definite minimization problem, similar to the Blatter-Pattyn model but without any of the approximations. This is accomplished by introducing a divergence-free velocity field that satisfies appropriate boundary conditions as a trial function in the variational formulation, thus dispensing with the need for a pressure. Such a velocity field is obtained by vertically integrating the continuity equation to give the vertical velocity as a function of the horizontal velocity components, as is in fact done in the Blatter-Pattyn model. This leads to a reduced system for just the horizontal velocity components, again just as in the Blatter-Pattyn model, but now without approximation. In the process we obtain a new, reformulated Stokes action principle as well as a novel set of Euler-Lagrange partial differential equations and boundary conditions. The model is also generalized from the common case of an ice sheet in contact with and sliding along the bed to other situations, such as to a floating ice shelf. These results are illustrated and validated using a simple but nontrivial Stokes flow problem involving a sliding ice sheet. JF - Cryosphere AU - Dukowicz, J K AD - Climate, Ocean, and Sea-Ice Modeling (COSIM) Project, Group T-3, MS B216, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA, duk@lanl.gov Y1 - 2012 PY - 2012 DA - 2012 SP - 21 EP - 34 VL - 6 IS - 1 SN - 1994-0416, 1994-0416 KW - Aqualine Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Meteorological & Geoastrophysical Abstracts KW - Floating Ice KW - Differential Equations KW - Boundary conditions KW - Ice sheet models KW - Cryosphere KW - Vertical velocities KW - Continuity Equation KW - Modelling KW - Mathematical models KW - Floating ice KW - Boundary Conditions KW - Velocity KW - Model Studies KW - Differential equations KW - Ice sheets KW - Glaciation KW - Slumping KW - M2 551.324:Land Ice/Glaciers (551.324) KW - AQ 00006:Sewage KW - Q2 09150:Ice KW - SW 0820:Snow, ice and frost UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1017982242?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Cryosphere&rft.atitle=Reformulating+the+full-Stokes+ice+sheet+model+for+a+more+efficient+computational+solution&rft.au=Dukowicz%2C+J+K&rft.aulast=Dukowicz&rft.aufirst=J&rft.date=2012-01-01&rft.volume=6&rft.issue=1&rft.spage=21&rft.isbn=&rft.btitle=&rft.title=Cryosphere&rft.issn=19940416&rft_id=info:doi/10.5194%2Ftc-6-21-2012 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-05-01 N1 - Last updated - 2014-05-02 N1 - SubjectsTermNotLitGenreText - Cryosphere; Mathematical models; Floating ice; Glaciation; Slumping; Modelling; Differential equations; Ice sheets; Vertical velocities; Boundary conditions; Ice sheet models; Boundary Conditions; Floating Ice; Velocity; Continuity Equation; Differential Equations; Model Studies DO - http://dx.doi.org/10.5194/tc-6-21-2012 ER - TY - JOUR T1 - A comparison of multiple phenology data sources for estimating seasonal transitions in deciduous forest carbon exchange AN - 911153721; 15936721 AB - There are currently numerous data sources available for estimating the timing of recurrent plant phenology transitions. We compared measurements from several phenology data sources to understand the relationship between phenology metrics derived from these data sources and the timing of seasonal transitions in net ecosystem exchange (NEE). We identified the timing of start, peak, end and the duration of the carbon uptake season, as well as the timing of the transitions from sink to source and source to sink using 11 years of NEE data from the University of Michigan Biological Station (UMBS). Using fitted logistic functions we identified proxy metrics for phenological transitions from the time series of Albedo, fraction of absorbed photosynthetically active radiation (fPAR), Plant Area Index (PAI), and MODIS normalized difference vegetation index (NDVI), enhanced vegetation index (EVI), and leaf area index (LAI) products of various spatial representations. We found that no single source of phenological data was able to accurately describe annual patterns of flux phenology. However, for each transition in NEE (e.g., start of season, transition to net sink), the metrics from one or more data sources were significantly (p<0.05) correlated with the timing of these recurring events. A marginally significant trend toward a longer NEE carbon uptake period over 11 years was not detected by any of the metrics, primarily because none of the metrics were available for the full duration of the NEE data, and NEE did not show significant and consistent trends during the sub-sets of the time when proxy data were available. The results of our study highlight the relative strengths and weaknesses of each phenology data source for directly estimating seasonal transitions and interannual trends in carbon flux phenology of a deciduous forest. JF - Agricultural and Forest Meteorology AU - Garrity, Steven R AU - Bohrer, Gil AU - Maurer, Kyle D AU - Mueller, Kim L AU - Vogel, Christoph S AU - Curtis, Peter S AD - Department of Civil, Environmental and Geodetic Engineering, Ohio State University, Columbus, OH 43210, United States, sgarrity@lanl.gov Y1 - 2011/12/15/ PY - 2011 DA - 2011 Dec 15 SP - 1741 EP - 1752 PB - Elsevier B.V., The Boulevard Kidlington Oxford OX5 1GB United Kingdom VL - 151 IS - 12 SN - 0168-1923, 0168-1923 KW - Water Resources Abstracts; Aqualine Abstracts; Environment Abstracts; Meteorological & Geoastrophysical Abstracts KW - Ameriflux KW - Carbon flux phenology KW - MODIS KW - NEE KW - Phenology KW - Remote sensing KW - albedo KW - deciduous forests KW - Sinks KW - Forests KW - Time series analysis KW - Carbon KW - Sulfur dioxide KW - Absorption KW - Seasonal variability KW - MODIS (Moderate Resolution Imaging Spectrometer) KW - Photosynthetically active radiation KW - Seasonal variations KW - Vegetation index KW - Timing KW - time series analysis KW - Estimating KW - Albedo KW - Vegetation KW - phenology KW - Deciduous Forests KW - Satellite data KW - Plant phenology KW - Plants KW - Fluctuations KW - AQ 00001:Water Resources and Supplies KW - ENA 06:Food & Drugs KW - SW 0540:Properties of water KW - M2 551.521.1/.18:Solar (551.521.1/.18) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/911153721?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Agricultural+and+Forest+Meteorology&rft.atitle=A+comparison+of+multiple+phenology+data+sources+for+estimating+seasonal+transitions+in+deciduous+forest+carbon+exchange&rft.au=Garrity%2C+Steven+R%3BBohrer%2C+Gil%3BMaurer%2C+Kyle+D%3BMueller%2C+Kim+L%3BVogel%2C+Christoph+S%3BCurtis%2C+Peter+S&rft.aulast=Garrity&rft.aufirst=Steven&rft.date=2011-12-15&rft.volume=151&rft.issue=12&rft.spage=1741&rft.isbn=&rft.btitle=&rft.title=Agricultural+and+Forest+Meteorology&rft.issn=01681923&rft_id=info:doi/10.1016%2Fj.agrformet.2011.07.008 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-12-01 N1 - Last updated - 2016-08-17 N1 - SubjectsTermNotLitGenreText - Satellite data; Phenology; Albedo; Plant phenology; MODIS (Moderate Resolution Imaging Spectrometer); Seasonal variability; Photosynthetically active radiation; Time series analysis; Vegetation index; albedo; Sulfur dioxide; time series analysis; deciduous forests; Plants; Forests; Vegetation; phenology; Seasonal variations; Deciduous Forests; Timing; Carbon; Estimating; Absorption; Sinks; Fluctuations DO - http://dx.doi.org/10.1016/j.agrformet.2011.07.008 ER - TY - JOUR T1 - Sputtering from a porous material by penetrating ions AN - 1734269930; 2015-111327 AB - Porous materials are ubiquitous in the universe and weathering of porous surfaces plays an important role in the evolution of planetary and interstellar materials. Sputtering of porous solids in particular can influence atmosphere formation, surface reflectivity, and the production of the ambient gas around materials in space. Several previous studies and models have shown a large reduction in the sputtering of a porous solid compared to the sputtering of the non-porous solid. Using molecular dynamics simulations we study the sputtering of a nanoporous solid with 55% of the solid density. We calculate the electronic sputtering induced by a fast, penetrating ion, using a thermal spike representation of the deposited energy. We find that sputtering for this porous solid is, surprisingly, the same as that for a full-density solid, even though the sticking coefficient is high. Copyright 2011. The American Astronomical Society. All rights reserved. JF - The Astrophysical Journal. Letters AU - Rodriguez-Nieva, J F AU - Bringa, E M AU - Cassidy, T A AU - Johnson, R E AU - Caro, A AU - Fama, M AU - Loeffler, M J AU - Baragiola, R A AU - Farkas, D Y1 - 2011/12/10/ PY - 2011 DA - 2011 Dec 10 EP - Paper no. L5 PB - IOP Publishing, Bristol VL - 743 IS - 1 SN - 2041-8205, 2041-8205 KW - icy satellites KW - penetration KW - Europa Satellite KW - interstellar medium KW - atmosphere KW - porous materials KW - Galilean satellites KW - interplanetary space KW - simulation KW - ions KW - weathering KW - porosity KW - sputtering KW - models KW - planets KW - ice KW - molecular dynamics KW - satellites KW - nanoparticles KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1734269930?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Astrophysical+Journal.+Letters&rft.atitle=Sputtering+from+a+porous+material+by+penetrating+ions&rft.au=Rodriguez-Nieva%2C+J+F%3BBringa%2C+E+M%3BCassidy%2C+T+A%3BJohnson%2C+R+E%3BCaro%2C+A%3BFama%2C+M%3BLoeffler%2C+M+J%3BBaragiola%2C+R+A%3BFarkas%2C+D&rft.aulast=Rodriguez-Nieva&rft.aufirst=J&rft.date=2011-12-10&rft.volume=743&rft.issue=1&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+Astrophysical+Journal.+Letters&rft.issn=20418205&rft_id=info:doi/10.1088%2F2041-8205%2F743%2F1%2FL5 L2 - http://iopscience.iop.org/2041-8205 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2015-01-01 N1 - Number of references - 26 N1 - Document feature - illus. N1 - Last updated - 2015-11-19 N1 - SubjectsTermNotLitGenreText - atmosphere; Europa Satellite; Galilean satellites; ice; icy satellites; interplanetary space; interstellar medium; ions; models; molecular dynamics; nanoparticles; penetration; planets; porosity; porous materials; satellites; simulation; sputtering; weathering DO - http://dx.doi.org/10.1088/2041-8205/743/1/L5 ER - TY - JOUR T1 - Atmospheric impact of large methane emission in the Arctic region AN - 959099418; 2012-035978 AB - A highly potent greenhouse gas, methane, is locked in the solid phase as ice-like deposits containing a mixture of water and gas (mostly methane) called clathrates, in ocean sediments and underneath permafrost regions. Clathrates are stable under high pressure and low temperatures. Recent estimates suggest that about 1600-2000 GtC of clathrates are present in oceans and 400 GtC in Arctic permafrost (Archer et al.2009) which is about 4000 times that of current annual emissions. In a warming climate, increase in ocean temperatures could alter the geothermal gradient, which in turn could lead to dissociation of the clathrates and release of methane into the ocean and subsequently into the atmosphere as well. This could be of particular importance in the shallow part of the Arctic Ocean where the clathrates are found in depths of only 300 m. In this presentation, we shall show results from our ongoing simulation of a scenario of large scale methane outgassing from clathrate dissociation due to warming ocean temperatures in the Arctic based on ocean sediment modeling. To that end we use the CESM (Community Earth System Model) version 1 with fully active coupled atmosphere-ocean-land model together with fast atmospheric chemistry module to simulate the response to increasing methane emissions in the Barents Sea, Canadian Archipelago and the Sea of Okhotsk. The simulation shows the effect these methane emissions could have on global surface methane, surface ozone, surface air temperature and other related indices. JF - American Geophysical Union Fall Meeting AU - Bhattacharyya, S AU - Cameron-Smith, P J AU - Bergmann, D AU - Reagan, M T AU - Collins, W AU - Elliott, S M AU - Maltrud, M E AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract GC41B EP - 0803 PB - American Geophysical Union, Washington, DC VL - 2011 KW - permafrost KW - gas hydrates KW - Arctic Archipelago KW - aliphatic hydrocarbons KW - West Pacific KW - temperature KW - Okhotsk Sea KW - atmospheric circulation KW - marine sediments KW - Barents Sea KW - Nunavut KW - sediments KW - Arctic Ocean KW - Northwest Pacific KW - chemical composition KW - soils KW - methane KW - Arctic region KW - atmosphere KW - alkanes KW - clathrates KW - organic compounds KW - Canada KW - North Pacific KW - Pacific Ocean KW - hydrocarbons KW - air KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/959099418?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Atmospheric+impact+of+large+methane+emission+in+the+Arctic+region&rft.au=Bhattacharyya%2C+S%3BCameron-Smith%2C+P+J%3BBergmann%2C+D%3BReagan%2C+M+T%3BCollins%2C+W%3BElliott%2C+S+M%3BMaltrud%2C+M+E%3BAnonymous&rft.aulast=Bhattacharyya&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2017-01-19 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - air; aliphatic hydrocarbons; alkanes; Arctic Archipelago; Arctic Ocean; Arctic region; atmosphere; atmospheric circulation; Barents Sea; Canada; chemical composition; clathrates; gas hydrates; hydrocarbons; marine sediments; methane; North Pacific; Northwest Pacific; Nunavut; Okhotsk Sea; organic compounds; Pacific Ocean; permafrost; sediments; soils; temperature; West Pacific ER - TY - JOUR T1 - Scaling laws in Arctic permafrost river basins; statistical signature in transition AN - 959099000; 2012-035949 AB - The Arctic landscape has been shown to be fundamentally different from the temperate landscape in many ways. Long winters and cold temperatures have led to the development of permafrost, perennially frozen ground, that controls geomorphic processes and the structure of the Arctic landscape. Climate warming is causing changes in permafrost and the active layer (the seasonally thawed surface layer) that is driving an increase in thermal erosion including thermokarst (collapsed soil), retrogressive thaw slumps, and gullies. These geomorphic anomalies in the arctic landscapes have not been well quantified, even though some of the landscape geomorphic and hydrologic characteristics and changes are detectable by our existing sensor networks. We currently lack understanding of the fundamental fluvio-thermal-erosional processes that underpin Arctic landscape structure and form, which limits our ability to develop models to predict the landscape response to current and future climate change. In this work, we seek a unified framework that can explain why permafrost landscapes are different from temperate landscapes. We use high resolution LIDAR data to analyze arctic geomorphic processes at a scale of less than a 1 m and demonstrate our ability to quantify the fundamental difference in the arctic landscape. We first simulate the arctic hillslopes from a stochastic space-filling network and demonstrate that the flow-path convergent properties of arctic landscape can be effectively captured from this simple model, where the simple model represents a landscape flowpath arrangement on a relatively impervious frozen soil layer. Further, we use a novel data processing algorithm to analyze landscape attributes such as slope, curvature, flow-accumulation, elevation-drops and other geomorphic properties, and show that the pattern of diffusion and advection dominated soil transport processes (diffusion/advection regime transition) in the arctic landscape is substantially different from the pattern in temperate landscapes. Our results suggest that Arctic landscapes are characterized by relatively undissected, long planar hillslopes, which convey sediment to quasi-fluvial valleys through long ( approximately 1 km) flow-paths. Further, we also document that broad planar hillslopes abruptly converge, forcing rapid subsurface flow accumulation at channel heads. This topographic characteristic can successfully be used to explain the position of erosion features. Finally we estimate the landscape model parameters for the arctic landscape that can be successfully used to model development and validation purposes. JF - American Geophysical Union Fall Meeting AU - Rowland, J C AU - Gangodagamage, C AU - Wilson, C J AU - Prancevic, Jeff P AU - Brumby, S P AU - Marsh, Philip AU - Crosby, B T AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract C41C EP - 0424 PB - American Geophysical Union, Washington, DC VL - 2011 KW - permafrost KW - Arctic region KW - landform evolution KW - erosion features KW - temperature KW - ice KW - thermokarst KW - fluvial features KW - drainage basins KW - ground ice KW - geomorphology KW - landscapes KW - active layer KW - frozen ground KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/959099000?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Scaling+laws+in+Arctic+permafrost+river+basins%3B+statistical+signature+in+transition&rft.au=Rowland%2C+J+C%3BGangodagamage%2C+C%3BWilson%2C+C+J%3BPrancevic%2C+Jeff+P%3BBrumby%2C+S+P%3BMarsh%2C+Philip%3BCrosby%2C+B+T%3BAnonymous&rft.aulast=Rowland&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2017-01-19 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - active layer; Arctic region; drainage basins; erosion features; fluvial features; frozen ground; geomorphology; ground ice; ice; landform evolution; landscapes; permafrost; temperature; thermokarst ER - TY - JOUR T1 - Scattering structure changes caused by CO (sub 2) injection AN - 959096382; 2012-036002 AB - Storage of carbon dioxide within underground geologic formations/reservoirs is the most promising option to mitigate the increase in the atmospheric greenhouse gases. Reliable monitoring of reservoir changes during CO (sub 2) storage will play a critical role to ensure safe, long-term CO (sub 2) storage. Injection and migration of CO (sub 2) and its reactions with reservoir rocks will cause changes in seismic velocities, density and attenuation, resulting in changes in time-lapse seismic signals. In this study, we use reverse-time migration of walkaway VSP (vertical seismic profiles) data to study scattering structure changes in the reservoir caused by CO (sub 2) injection. Our study region is located at the SACROC oilfield, Scurry County, Texas. The VSP geophone depths range from 5000 to 5700 feet. The CO (sub 2) injection started at October, 2008, and the walkaway VSP data were acquired in July 2008 and April 2009, before and after the CO (sub 2) injection. We conduct time-reverse migration using upgoing waves of the walkaway VSP data to study detailed scattering structure changes of the reservoir. Comparing migration images of time-lapse VSP data, we constrain scattering structure changes in the reservoir caused by CO (sub 2) injection. JF - American Geophysical Union Fall Meeting AU - Wang, Yi AU - Huang, L AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract GC41E EP - 07 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - geophones KW - monitoring KW - carbon sequestration KW - Scurry County Texas KW - atmosphere KW - Texas KW - petroleum KW - production KW - oil and gas fields KW - climate change KW - reservoir rocks KW - carbon dioxide KW - mitigation KW - greenhouse gases KW - chemical composition KW - instruments KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/959096382?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Scattering+structure+changes+caused+by+CO+%28sub+2%29+injection&rft.au=Wang%2C+Yi%3BHuang%2C+L%3BAnonymous&rft.aulast=Wang&rft.aufirst=Yi&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2017-01-19 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - atmosphere; carbon dioxide; carbon sequestration; chemical composition; climate change; geophones; greenhouse gases; instruments; mitigation; monitoring; oil and gas fields; petroleum; production; reservoir rocks; Scurry County Texas; Texas; United States ER - TY - JOUR T1 - Determination of Love- and Rayleigh-wave magnitudes for earthquakes and explosions AN - 916840628; 2012-016392 AB - Since the 1960s, comparing a Rayleigh-wave magnitude M (sub s) to the body-wave magnitude m (sub b) (M (sub s) :m (sub b) ) has been a robust tool for the discrimination of earthquakes and explosions. In this article, we apply a Rayleigh-wave formula as is to Love waves and examine the possibilities for discrimination using only surface-wave magnitudes (M (sub s) :M (sub s) ). To calculate the magnitudes, we apply the time-domain magnitude technique called M (sub s) (VMAX), developed by Russell (2006), to Rayleigh and Love waves from explosions and earthquakes. Our results indicate that, for the majority of the earthquakes studied (>75%), the M (sub s) (VMAX) obtained from Love waves is greater than that estimate from Rayleigh waves. Conversely, 79 of 82 nuclear explosions analyzed (96%) had network-averaged M (sub s) (VMAX)-Rayleigh equal to or greater than the M (sub s) (VMAX)-Love. We used logistic regression to examine an Formula discriminant. Cross-validation analysis of the new discriminant correctly identifies 57 of 82 explosions and 246 of 264 earthquakes, while misidentifying 22 explosions as earthquakes and 11 earthquakes as explosions. Further comparative research is planned for Formula versus M (sub s) :m (sub b) using common data. We fully expect that Formula will contribute significantly to multivariate event identification. JF - Bulletin of the Seismological Society of America AU - Bonner, Jessie L AU - Stroujkova, Anastasia AU - Anderson, Dale Y1 - 2011/12// PY - 2011 DA - December 2011 SP - 3096 EP - 3104 PB - Seismological Society of America, Berkeley, CA VL - 101 IS - 6 SN - 0037-1106, 0037-1106 KW - Far East KW - guided waves KW - explosions KW - magnitude KW - Europe KW - elastic waves KW - Korea KW - Rayleigh waves KW - Italy KW - Southern Europe KW - surface waves KW - Love waves KW - seismicity KW - seismic waves KW - algorithms KW - nuclear explosions KW - Asia KW - earthquakes KW - Middle East KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/916840628?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America&rft.atitle=Determination+of+Love-+and+Rayleigh-wave+magnitudes+for+earthquakes+and+explosions&rft.au=Bonner%2C+Jessie+L%3BStroujkova%2C+Anastasia%3BAnderson%2C+Dale&rft.aulast=Bonner&rft.aufirst=Jessie&rft.date=2011-12-01&rft.volume=101&rft.issue=6&rft.spage=3096&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120110131 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Seismological Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 27 N1 - PubXState - CA N1 - Document feature - illus. incl. sketch maps N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-06-07 N1 - CODEN - BSSAAP N1 - SubjectsTermNotLitGenreText - algorithms; Asia; earthquakes; elastic waves; Europe; explosions; Far East; guided waves; Italy; Korea; Love waves; magnitude; Middle East; nuclear explosions; Rayleigh waves; seismic waves; seismicity; Southern Europe; surface waves DO - http://dx.doi.org/10.1785/0120110131 ER - TY - JOUR T1 - Mantle-driven dynamic uplift of the Rocky Mountains and Colorado Plateau and its surface response; toward a unified hypothesis AN - 916838786; 2012-014418 AB - The correspondence between seismic velocity anomalies in the crust and mantle and differential incision of the continental-scale Colorado River system suggests that significant mantle-to-surface interactions can take place deep within continental interiors. The Colorado Rocky Mountain region exhibits low-seismic-velocity crust and mantle associated with atypically high (and rough) topography, steep normalized river segments, and areas of greatest differential river incision. Thermochronologic and geologic data show that regional exhumation accelerated starting ca. 6-10 Ma, especially in regions underlain by low-velocity mantle. Integration and synthesis of diverse geologic and geophysical data sets support the provocative hypothesis that Neogene mantle convection has driven long-wavelength surface deformation and tilting over the past 10 Ma. Attendant surface uplift on the order of 500-1000 m may account for approximately 25%-50% of the current elevation of the region, with the rest achieved during Laramide and mid-Tertiary uplift episodes. This hypothesis highlights the importance of continued multidisciplinary tests of the nature and magnitude of surface responses to mantle dynamics in intraplate settings. JF - Lithosphere AU - Karlstrom, Karl E AU - Coblentz, D AU - Dueker, K AU - Ouimet, W AU - Kirby, E AU - van Wijk, J AU - Schmandt, B AU - Kelley, S AU - Lazear, G AU - Crossey, L J AU - Crow, R AU - Aslan, A AU - Darling, A AU - Aster, R AU - MacCarthy, J AU - Hansen, S M AU - Stachnik, J AU - Stockli, D F AU - Garcia, R V AU - Hoffman, M AU - McKeon, R AU - Feldman, J AU - Heizler, M AU - Donahue, M S AU - Farmer, Lang AU - Shaw, Colin AU - Leonard, Eric AU - Chase, Clem AU - Nereson, Alex AU - Cole, Rex Y1 - 2011/12// PY - 2011 DA - December 2011 SP - 3 EP - 22 PB - Geological Society of America, Boulder, CO VL - 4 IS - 1 SN - 1941-8264, 1941-8264 KW - Colorado River basin KW - dynamic topography KW - uplifts KW - elastic waves KW - San Juan River basin KW - New Mexico KW - erosion features KW - buoyancy KW - isostasy KW - (U-Th)/He KW - topography KW - geochronology KW - absolute age KW - thickness KW - exhumation KW - degassing KW - apatite KW - upper mantle KW - North America KW - Idaho KW - Quaternary KW - lithosphere KW - Little Colorado River basin KW - San Juan Mountains KW - fission-track dating KW - Wyoming KW - asthenosphere KW - Tertiary KW - deposition KW - velocity structure KW - fluvial features KW - seismic waves KW - Colorado KW - crust KW - United States KW - upwelling KW - relative age KW - density KW - Green River basin KW - mantle KW - Cenozoic KW - spatial distribution KW - neotectonics KW - dynamics KW - dates KW - volcanism KW - velocity KW - thermochronology KW - tectonics KW - stream gradient KW - Colorado Plateau KW - U. S. Rocky Mountains KW - rates KW - phosphates KW - deformation KW - river profiles KW - Neogene KW - Arizona KW - Pliocene KW - Utah KW - geomorphology KW - incised valleys KW - Rocky Mountains KW - 18:Solid-earth geophysics KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/916838786?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Lithosphere&rft.atitle=Mantle-driven+dynamic+uplift+of+the+Rocky+Mountains+and+Colorado+Plateau+and+its+surface+response%3B+toward+a+unified+hypothesis&rft.au=Karlstrom%2C+Karl+E%3BCoblentz%2C+D%3BDueker%2C+K%3BOuimet%2C+W%3BKirby%2C+E%3Bvan+Wijk%2C+J%3BSchmandt%2C+B%3BKelley%2C+S%3BLazear%2C+G%3BCrossey%2C+L+J%3BCrow%2C+R%3BAslan%2C+A%3BDarling%2C+A%3BAster%2C+R%3BMacCarthy%2C+J%3BHansen%2C+S+M%3BStachnik%2C+J%3BStockli%2C+D+F%3BGarcia%2C+R+V%3BHoffman%2C+M%3BMcKeon%2C+R%3BFeldman%2C+J%3BHeizler%2C+M%3BDonahue%2C+M+S%3BFarmer%2C+Lang%3BShaw%2C+Colin%3BLeonard%2C+Eric%3BChase%2C+Clem%3BNereson%2C+Alex%3BCole%2C+Rex&rft.aulast=Karlstrom&rft.aufirst=Karl&rft.date=2011-12-01&rft.volume=4&rft.issue=1&rft.spage=3&rft.isbn=&rft.btitle=&rft.title=Lithosphere&rft.issn=19418264&rft_id=info:doi/10.1130%2FL150.1 L2 - http://lithosphere.gsapubs.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 165 N1 - PubXState - CO N1 - Document feature - illus. incl. geol. sketch maps N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - (U-Th)/He; absolute age; apatite; Arizona; asthenosphere; buoyancy; Cenozoic; Colorado; Colorado Plateau; Colorado River basin; crust; dates; deformation; degassing; density; deposition; dynamic topography; dynamics; elastic waves; erosion features; exhumation; fission-track dating; fluvial features; geochronology; geomorphology; Green River basin; Idaho; incised valleys; isostasy; lithosphere; Little Colorado River basin; mantle; Neogene; neotectonics; New Mexico; North America; phosphates; Pliocene; Quaternary; rates; relative age; river profiles; Rocky Mountains; San Juan Mountains; San Juan River basin; seismic waves; spatial distribution; stream gradient; tectonics; Tertiary; thermochronology; thickness; topography; U. S. Rocky Mountains; United States; uplifts; upper mantle; upwelling; Utah; velocity; velocity structure; volcanism; Wyoming DO - http://dx.doi.org/10.1130/L150.1 ER - TY - JOUR T1 - What does a mean really mean? Interpreting mainstem detrital CRN data in transient landscapes, south fork Eel River, CA AN - 1828846812; 2016-085551 AB - In landscapes with steady, uniform erosion rates, mainstem detrital cosmogenic radionuclide (CRN) concentrations are expected to reflect basin-wide erosion rates. In this study, we use both field and numerical experiments to provide new insight into how these rates will vary in over space and time during transient landscape adjustment. Our field data come from the South Fork Eel River (SFER) in Northern California where well-aligned knickpoints and terraces along the mainstem and tributary channels define a clear boundary between an incised, actively adjusting lowland and an unadjusted relict upland landscape. This transient adjustment is most complete in the lower portion of the basin and becomes progressively less extensive upstream, consistent with an upstream propagating wave of adjustment. To test if detrital CRN erosion rates would reflect this transient adjustment, we collected 9 sand samples along the mainstem SFER at sites distributed between the headwaters and the basin outlet. CRN erosion rates increase systematically down the mainstem from 0.22 to 0.52 mm/yr. This gradual increase in erosion rate reflects the progressive dilution of relict high CRN concentrations by low CRN concentration sediment from the rapidly eroding, adjusting regions downstream. Using a simple, two member sediment mixing model, we find that CRN concentrations should decrease in a non-linear manner as the proportion of the basin in the adjusting state increases. In order to test this non-linear dilution theory, we use the mapped boundary between the relict and adjusting regions in the SFER to quantify, for each mainstem sample site, the fraction of upstream drainage area that is in a relict state. Because the adjustment is relatively immature, our samples only range from 75% to 98% relict, but fall along the predicted mixing line. Because detrital CRN erosion rate data from any field site only provides a single snapshot of contemporary erosion rates, we employ the CHILD numerical landscape evolution model to test how detrital erosion rates should vary within the network, over the lifetime of the transient. Our initial, steady state landscape has the same dimensions and topographic characteristics (relief, channel steepness, etc.) as the relict regions in the SFER. We generate two transient disturbances: a simple increase in uplift and a migrating wave of transient uplift modeled after the crustal conveyor hypothesis. In both scenarios, the early, initial adjustments follow the same negative, non-linear correlation between erosion rate and % relict area as seen in the CRN field data, but as the transient responses becomes more extensive, the two modeled correlations diverge. For the simple increase in uplift, erosion rates tends toward the new higher value and for the crustal conveyor, erosion rates return back to initial values as the uplift wave leaves the system. Our efforts help constrain a predictable a relation between different disturbance scenarios and expected CRN signatures in transient landscapes. JF - American Geophysical Union Fall Meeting AU - Crosby, B T AU - Rowland, J C AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract EP51C EP - 01 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - concentration KW - numerical models KW - landform evolution KW - knickpoints KW - uplifts KW - sedimentation KW - Eel River KW - cosmogenic elements KW - detrital sedimentation KW - erosion rates KW - erosion features KW - relief KW - California KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1828846812?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=What+does+a+mean+really+mean%3F+Interpreting+mainstem+detrital+CRN+data+in+transient+landscapes%2C+south+fork+Eel+River%2C+CA&rft.au=Crosby%2C+B+T%3BRowland%2C+J+C%3BAnonymous&rft.aulast=Crosby&rft.aufirst=B&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - California; concentration; cosmogenic elements; detrital sedimentation; Eel River; erosion features; erosion rates; knickpoints; landform evolution; numerical models; relief; sedimentation; United States; uplifts ER - TY - JOUR T1 - Model resolution, model covariance, and travel time prediction uncertainty for a global tomographic P-velocity model AN - 1824215342; 2016-084051 AB - Global 3D models of the compression wave speed in the Earth can provide superior travel time predictions at both regional and teleseismic distances. However, given the variable data quality and highly uneven data sampling associated with this type of model, the uncertainty of predicted travel times computed through these models will vary significantly with position in the Earth. Seismic event location codes require good estimates of the prediction uncertainty in order to apply appropriate weights to the various observations used to compute the locations and to calculate reliable estimates of the uncertainty of the resulting locations. The approach that we are adopting is to calculate prediction uncertainties from the tomographic matrices. Quantities that are computed along the way include the model resolution matrix, the model covariance matrix and, finally, the travel time uncertainties. We have found it necessary to include a previously ignored term in the determination of the model covariance matrix that we call the 'a priory covariance of the change in slowness', which we will describe in detail. We will also show results of all of these quantities obtained by applying the calculations to our SALSA3D model, a global P-velocity model of the Earth's mantle. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. JF - American Geophysical Union Fall Meeting AU - Ballard, S AU - Young, C J AU - Hipp, J R AU - Encarnacao, A AU - Chang, M AU - Begnaud, M L AU - Phillips, W S AU - Anderson, D AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S51D EP - 01 PB - American Geophysical Union, Washington, DC VL - 2011 KW - tomography KW - P-waves KW - body waves KW - monitoring KW - Earth KW - statistical analysis KW - prediction KW - elastic waves KW - teleseismic signals KW - models KW - phase velocity KW - earthquake prediction KW - traveltime KW - velocity KW - seismic waves KW - covariance analysis KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1824215342?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Model+resolution%2C+model+covariance%2C+and+travel+time+prediction+uncertainty+for+a+global+tomographic+P-velocity+model&rft.au=Ballard%2C+S%3BYoung%2C+C+J%3BHipp%2C+J+R%3BEncarnacao%2C+A%3BChang%2C+M%3BBegnaud%2C+M+L%3BPhillips%2C+W+S%3BAnderson%2C+D%3BAnonymous&rft.aulast=Ballard&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-09-29 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - body waves; covariance analysis; Earth; earthquake prediction; elastic waves; models; monitoring; P-waves; phase velocity; prediction; seismic waves; statistical analysis; teleseismic signals; tomography; traveltime; velocity ER - TY - JOUR T1 - Water in Aleutian Arc volcanoes AN - 1812219270; 2016-069631 AB - In the past decade, baseline data have been obtained on pre-eruptive water contents for several volcanic arcs worldwide. One surprising observation is that parental magmas contain approximately 4 wt% H2O on average at each arc worldwide. Within each arc, the variation from volcano to volcano is from 2 to 6 w% H2O, with few exceptions. The similar averages at different arcs are unexpected given the order of magnitude variations in the concentration of other slab tracers. H2O is clearly different from other tracers, however, being both a major driver of melting in the mantle and a major control of buoyancy and viscosity in the crust. Some process, such as mantle melting or crustal storage, apparently modulates the water content of mafic magmas at arcs. Mantle melting may deliver a fairly uniform product to the Moho, if the wet melt process includes a negative feedback. On the other hand, magmas with variable water content may be generated in the mantle, but a crustal filter may lead to magma degassing up to a common mid-to-upper crustal storage region. Testing between these two end-member scenarios is critical to our understanding of subduction dehydration, global water budgets, magmatic plumbing systems, melt generation and eruptive potential. The Alaska-Aleutian arc is a prime location to explore this fundamental problem in the subduction water cycle, because active volcanoes vary more than elsewhere in the world in parental H2O contents (based on least-degassed, mafic melt inclusions hosted primarily in olivine). For example, Shishaldin volcano taps magma with among the lowest H2O contents globally ( approximately 2 wt%) and records low pressure crystal fractionation, consistent with a shallow magma system (<1 km bsl). At the other extreme, Augustine volcano is fed by a mafic parent that contains among the highest H2O globally ( approximately 7 wt%), and has evolved by deep crystal fractionation, consistent with a deep magma system ( approximately 14 km bsl). Do these magmas stall at different depths because of different crustal regimes or because of different primary magma compositions? Do magmas degas until they physically stall, or do they stall when they start to degas? One test of this is whether H2O contents correlate with tracers from the subduction zone that are not fractionated easily during crystal fractionation or degassing. We find a strong negative correlation between H2O/Ce (based on the maximum H2O measured in a given inclusion population) and Nb/Ce in eight Aleutian volcanoes, which is well explained by variable amounts of a slab fluid, but would be fortuitous, or strongly disturbed, if major degassing took place in the crust during magma ascent. Thus, geochemical data point to a strong slab-mantle control on H2O, that may set the future course of magma ascent, storage and eruption. Integrated studies are needed to test this prediction, including seismic imaging and geodetic response of the volcanic system, from the slab to the surface. JF - American Geophysical Union Fall Meeting AU - Plank, T AU - Zimmer, Mindy M AU - Hauri, E H AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract T41A EP - 02 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - hydrology KW - subduction zones KW - magnitude KW - mantle KW - mafic composition KW - subduction KW - buoyancy KW - hydrologic cycle KW - plate tectonics KW - melting KW - island arcs KW - magmas KW - tracers KW - slabs KW - volcanoes KW - Shishaldin KW - Alaska KW - Aleutian Islands KW - earthquakes KW - crust KW - degassing KW - 19:Seismology KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1812219270?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Water+in+Aleutian+Arc+volcanoes&rft.au=Plank%2C+T%3BZimmer%2C+Mindy+M%3BHauri%2C+E+H%3BAnonymous&rft.aulast=Plank&rft.aufirst=T&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-08-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Alaska; Aleutian Islands; buoyancy; crust; degassing; earthquakes; hydrologic cycle; hydrology; island arcs; mafic composition; magmas; magnitude; mantle; melting; plate tectonics; Shishaldin; slabs; subduction; subduction zones; tracers; United States; volcanoes ER - TY - JOUR T1 - Probable cause of interplanetary field enhancements; destructive collisions of small bodies AN - 1773800299; 2016-023744 AB - Interplanetary Field Enhancements (IFEs) appear as smoothly varying cusp-shaped enhancements in the interplanetary magnetic field with a strong central current sheet. They last minutes to many hours. IFEs were attributed to dust released by asteroids and comets because of their appearance in association with conjunctions with asteroid 2201 Oljato. To maintain their magnetic field structure while at rest in the solar wind frame, IFEs must have significant mass because they do not have a flux rope geometry. We use the pressure gradient force to estimate the IFE mass using Helios (0.3-1.0 AU) and ACE (1 AU) data. We find the magnetic pressure difference falls as R-2 approximately from 0.3 AU to 1 AU, keeping the mass almost constant. At 1 AU, the most frequent IFE mass is 10 (super 8) kg and the rate decreases with both increasing and decreasing mass. We believe IFEs arise in interactions between solar wind and charged nanoscale dust particles produced in collisions of interplanetary objects. This hypothesis explains the large velocity achieved by IFEs, the macroscale magnetic field disturbances and the large mass contained in IFEs. In this paper we will use observed meteoroid population and collision models to calculate the inferred occurrence rate at 1 AU and estimate the mass released by these collisions. By estimating the size of the disturbance produced by the collisions, we can relate the collision rate to the event rate detected by a spacecraft. The estimated meteoroid collision rate is found to be consistent with the IFE occurrence rate within the same mass range. JF - American Geophysical Union Fall Meeting AU - Lai, H AU - Russell, C T AU - Delzanno, G L AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract P41C EP - 1640 PB - American Geophysical Union, Washington, DC VL - 2011 KW - asteroids KW - clastic sediments KW - rates KW - meteoroids KW - impacts KW - magnetic field KW - models KW - mass KW - detection KW - comets KW - dust KW - sediments KW - particles KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1773800299?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Probable+cause+of+interplanetary+field+enhancements%3B+destructive+collisions+of+small+bodies&rft.au=Lai%2C+H%3BRussell%2C+C+T%3BDelzanno%2C+G+L%3BAnonymous&rft.aulast=Lai&rft.aufirst=H&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-03-17 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - asteroids; clastic sediments; comets; detection; dust; impacts; magnetic field; mass; meteoroids; models; particles; rates; sediments ER - TY - JOUR T1 - Phyllosilicate analysis capabilities of the CheMin mineralogical instrument on the Mars Science Laboratory (MSL '11) Curiosity Rover AN - 1773800134; 2016-023703 AB - The CheMin mineralogical instrument on the MSL '11 Curiosity rover will return quantitative X-ray diffraction data (XRD) from scooped soil samples and drilled rock powders collected from the Mars surface. Samples of 45-65 mm (super 3) from material sieved to 4X MDL (12%). The resolution of the diffraction patterns is 0.30 degrees 2theta , and the angular measurement range is 4-55 degrees 2theta . With this performance, CheMin can identify and distinguish a number of clay minerals. For example, discrimination between 1:1 phyllosilicates (such as the kaolin minerals), with repeat distances of approximately 7Aa, and smectites (e.g., montmorillonite, nontronite, saponite), with repeat distances from 10-15Aa, is straightforward. However, it is important to note that the variety of treatments used in terrestrial laboratories to aid in discrimination of clay minerals will not be accessible on Mars (e.g., saturation with ethylene glycol vapor, heat treatments). Although these treatments will not be available on Mars, dehydration within the CheMin instrument could be used to advantage in discriminating between phyllosilicate minerals that exhibit different dehydration behavior, such as chlorite vs. smectite. In addition, it should be possible to identify the hydrated kaolin mineral, halloysite. The lowest-angle diffraction peak from 10.1Aa hydrated halloysite occurs at approximately 10.2 degrees 2theta with Co radiation and is easily detectable; the mineral may readily dehydrate to approximately 7Aa, making its identification possible based on this transition. Examples will be shown of clay mineral analysis using CheMin IV, a prototype of the CheMin flight instrument. JF - American Geophysical Union Fall Meeting AU - Blake, D F AU - Bish, D L AU - Vaniman, D T AU - Chipera, S AU - Bristow, T F AU - Sarrazin, P AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract P34C EP - 05 PB - American Geophysical Union, Washington, DC VL - 2011 KW - soils KW - silicates KW - X-ray diffraction data KW - structural analysis KW - Mars KW - samples KW - preferred orientation KW - order-disorder KW - clay minerals KW - terrestrial planets KW - planets KW - quantitative analysis KW - identification KW - Curiosity Rover KW - Mars Science Laboratory KW - CheMin KW - sheet silicates KW - halloysite KW - rocks KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1773800134?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Phyllosilicate+analysis+capabilities+of+the+CheMin+mineralogical+instrument+on+the+Mars+Science+Laboratory+%28MSL+%2711%29+Curiosity+Rover&rft.au=Blake%2C+D+F%3BBish%2C+D+L%3BVaniman%2C+D+T%3BChipera%2C+S%3BBristow%2C+T+F%3BSarrazin%2C+P%3BAnonymous&rft.aulast=Blake&rft.aufirst=D&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-03-17 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - CheMin; clay minerals; Curiosity Rover; halloysite; identification; instruments; Mars; Mars Science Laboratory; order-disorder; planets; preferred orientation; quantitative analysis; rocks; samples; sheet silicates; silicates; soils; structural analysis; terrestrial planets; X-ray diffraction data ER - TY - JOUR T1 - Obliquity-controlled water vapor/trace gas feedback in the Martian greenhouse cycle AN - 1765875630; 2016-010989 AB - The mechanism(s) by which the climate of early Mars was maintained in a "warm, wet" state remains unclear. The possibility that trace gases played a significant role in keeping early Mars warm suffers from some weaknesses, but is likely still an important component in an integrated climate system. Current work demonstrates that the joint effects of water vapor and volcanically derived trace gases have a more significant greenhouse effect than previously assumed. Simply, a warming "pulse" caused by injection of small amounts of volcanic gases (e.g. SO2, CH4) provides a small but sufficient increase in atmospheric temperature, allowing a greater quantity of water vapor (injected as a volcanic gas and/or available from the surface) into the atmosphere, the latter assuming the dominant greenhouse role in the warm/wet scenario. Warm temperatures can be maintained for some time even following the loss of the trace gas "trigger" by precipitation or chemical decay. The gain and loss of this water vapor in the atmosphere is further regulated by the planetary obliquity cycle, which controls the saturation abundance of atmospheric vapor. Under periods of low obliquity, the atmosphere can hold little vapor, and this feedback process will be inhibited. Only when obliquity rises above some threshold value will the amount of atmospheric vapor be capable of effectively sustaining warm temperatures (and then only when triggered by the injection of other trace gases). Multi-bar levels of CO2 are not required at any stage of the process, but are not precluded, and hence this process can take place during most of martian history. This mechanism can help explain the warm conditions during the Noachian, as well as the presence of fluvial surface features (e.g. inverted channels, valley networks) and aqueous minerals (e.g. sulfates) of Hesperian and Early Amazonian age--periods when alternate methods do not convincingly explain the presence of liquid water. JF - American Geophysical Union Fall Meeting AU - Mischna, Michael A AU - Lee, C AU - Baker, V R AU - Milliken, Ralph AU - Clifford, S M AU - Lasue, J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract P11G EP - 04 PB - American Geophysical Union, Washington, DC VL - 2011 KW - water KW - liquid phase KW - obliquity of the ecliptic KW - Noachian KW - mechanism KW - atmosphere KW - water vapor KW - Mars KW - Hesperian KW - temperature KW - gases KW - terrestrial planets KW - feedback KW - planets KW - Amazonian KW - planetology KW - greenhouse effect KW - climate KW - trace gases KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1765875630?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Obliquity-controlled+water+vapor%2Ftrace+gas+feedback+in+the+Martian+greenhouse+cycle&rft.au=Mischna%2C+Michael+A%3BLee%2C+C%3BBaker%2C+V+R%3BMilliken%2C+Ralph%3BClifford%2C+S+M%3BLasue%2C+J%3BAnonymous&rft.aulast=Mischna&rft.aufirst=Michael&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-02-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Amazonian; atmosphere; climate; feedback; gases; greenhouse effect; Hesperian; liquid phase; Mars; mechanism; Noachian; obliquity of the ecliptic; planetology; planets; temperature; terrestrial planets; trace gases; water; water vapor ER - TY - JOUR T1 - Calculating path-dependent travel time prediction variance and covariance for the SALSA3D global tomographic P-velocity model with a distributed parallel multi-core computer AN - 1765872214; 2016-015211 AB - Recently our combined SNL-LANL research team has succeeded in developing a global, seamless 3D tomographic P-velocity model (SALSA3D) that provides superior first P travel time predictions at both regional and teleseismic distances. However, given the variable data quality and uneven data sampling associated with this type of model, it is essential that there be a means to calculate high-quality estimates of the path-dependent variance and covariance associated with the predicted travel times of ray paths through the model. In this paper, we show a methodology for accomplishing this by exploiting the full model covariance matrix. Our model has on the order of 1/2 million nodes, so the challenge in calculating the covariance matrix is formidable: 0.9 TB storage for 1/2 of a symmetric matrix, necessitating an Out-Of-Core (OOC) blocked matrix solution technique. With our approach the tomography matrix (G which includes Tikhonov regularization terms) is multiplied by its transpose (GTG) and written in a blocked sub-matrix fashion. We employ a distributed parallel solution paradigm that solves for (GTG)-1 by assigning blocks to individual processing nodes for matrix decomposition update and scaling operations. We first find the Cholesky decomposition of GTG which is subsequently inverted. Next, we employ OOC matrix multiply methods to calculate the model covariance matrix from (GTG)-1 and an assumed data covariance matrix. Given the model covariance matrix we solve for the travel-time covariance associated with arbitrary ray-paths by integrating the model covariance along both ray paths. Setting the paths equal gives variance for that path. Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000. JF - American Geophysical Union Fall Meeting AU - Hipp, J R AU - Encarnacao, A AU - Ballard, S AU - Young, C J AU - Phillips, W S AU - Begnaud, M L AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract IN13A EP - 1322 PB - American Geophysical Union, Washington, DC VL - 2011 KW - tomography KW - raypaths KW - distributed processing KW - P-waves KW - body waves KW - three-dimensional models KW - global KW - statistical analysis KW - data processing KW - elastic waves KW - teleseismic signals KW - computers KW - regional KW - traveltime KW - parallel processing KW - velocity KW - SALSA3D KW - seismic waves KW - covariance analysis KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1765872214?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Calculating+path-dependent+travel+time+prediction+variance+and+covariance+for+the+SALSA3D+global+tomographic+P-velocity+model+with+a+distributed+parallel+multi-core+computer&rft.au=Hipp%2C+J+R%3BEncarnacao%2C+A%3BBallard%2C+S%3BYoung%2C+C+J%3BPhillips%2C+W+S%3BBegnaud%2C+M+L%3BAnonymous&rft.aulast=Hipp&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-02-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - body waves; computers; covariance analysis; data processing; distributed processing; elastic waves; global; P-waves; parallel processing; raypaths; regional; SALSA3D; seismic waves; statistical analysis; teleseismic signals; three-dimensional models; tomography; traveltime; velocity ER - TY - JOUR T1 - Uncertainty analysis of geochemical parameters related to CO (sub 2) leakage into an unconfined limestone aquifer AN - 1765872195; 2016-015175 AB - Accurate prediction of the impact of leaking CO (sub 2) on groundwater quality is limited by the complexity of subsurface aquifers and the geochemical reactions that control drinking water compositions. As a result there is a high uncertainty associated with any predictions, hampering monitoring plans, interpretation of the monitoring results, and mitigation plans for a given site. Many physical and geochemical characteristics will dictate a drinking water aquifer's response to a CO (sub 2) leak. As a part of the National Risk Assessment Program (NRAP), funded by the U.S. Department of Energy, scientists at Pacific Northwest National Laboratory (PNNL) and Los Alamos National Laboratory (LANL) have collaborated on the development of a 3D heterogeneous model of the Edwards Aquifer in Texas to examine the impacts of CO (sub 2) leakage into an unconfined, carbonate aquifer. Using the same base case model, LANL has focused on uncertainty quantification (UQ) of the aquifer's hydraulic properties, whereas PNNL has examined the impact of uncertainty related to geochemical parameters. This abstract describes PNNL's work on geochemical UQ. The uncertainty analysis looks at the impact on several model outputs, including CO (sub 2) leakage rate from the water table, mean pH value, and pH<6.5 volume fraction. The uncertainty parameters are the leakage rate into the aquifer, the composition of the aquifer limestone, and the dissolution/precipitation rate for the limestone, which ranges over two orders of magnitude from laboratory-measured values for calcite to those for disordered dolomite. We also examine the impact on drinking water quality, specifically TDS, from leakage of brine from the underlying formation, forced upwards by increased pressure due to CO (sub 2) injection. To conduct these simulations we use STOMP-CO (sub 2) -R, which is a multiphase flow simulator, coupled with the reactive transport module ECKEChem, developed at PNNL to simulate CO (sub 2) sequestration in deep saline formations and the associated reactions with formation minerals. For uncertainty quantification, we use the PSUADE code. The user defines a range and/or distribution of key input parameters. PSUADE then generates a number of parameter files containing sample points from prescribed sampling method (i.e. Latin hypercube, Monte Carlo, etc.) and a file that combines the probability distribution functions for the selected parameters. STOMP input files are subsequently developed from each set of PSUADE generated sampling points prior to execution. Output from STOMP is then evaluated with respect to a given objective function. At this point, the response (n-dimensional) hyper-surface of the objective function is conducted and used for a global sensitivity analysis to evaluate the most sensitive parameters. Based on the global sensitivity analysis, the process is repeated, where the number of parameters is reduced to the most sensitive parameters and the number of sampling points increases to enhance resolution in the space of uncertain parameters. Once we have convergence on resolution, then the resulting response surface becomes the reduced order model that will be used to generate the risk profiles over a given time period. JF - American Geophysical Union Fall Meeting AU - Bacon, Diana H AU - Keating, E H AU - Viswanathan, H S AU - Dai, Z AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H54D EP - 06 PB - American Geophysical Union, Washington, DC VL - 2011 KW - limestone KW - water quality KW - salinity KW - solution KW - simulation KW - drinking water KW - seepage KW - ground water KW - carbon dioxide KW - sedimentary rocks KW - transport KW - sampling KW - reactive transport KW - probability KW - geochemistry KW - uncertainty KW - PSUADE KW - three-dimensional models KW - statistical analysis KW - hydrochemistry KW - STOMP-C02-R KW - aquifers KW - heterogeneous materials KW - ECKEChem KW - precipitation KW - brines KW - multiphase flow KW - carbonate rocks KW - unconfined aquifers KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1765872195?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Uncertainty+analysis+of+geochemical+parameters+related+to+CO+%28sub+2%29+leakage+into+an+unconfined+limestone+aquifer&rft.au=Bacon%2C+Diana+H%3BKeating%2C+E+H%3BViswanathan%2C+H+S%3BDai%2C+Z%3BAnonymous&rft.aulast=Bacon&rft.aufirst=Diana&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-02-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; brines; carbon dioxide; carbonate rocks; drinking water; ECKEChem; geochemistry; ground water; heterogeneous materials; hydrochemistry; limestone; multiphase flow; precipitation; probability; PSUADE; reactive transport; salinity; sampling; sedimentary rocks; seepage; simulation; solution; statistical analysis; STOMP-C02-R; three-dimensional models; transport; uncertainty; unconfined aquifers; water quality ER - TY - JOUR T1 - Numerical modeling of experimental observations on gas formation and multi-phase flow of carbon dioxide in subsurface formations AN - 1765871993; 2016-015170 AB - One of the concerns related to geologic CO2 sequestration is potential leakage of CO2 and its subsequent migration to shallow groundwater resources leading to geochemical impacts. Developing approaches to monitor CO2 migration in shallow aquifer and mitigate leakage impacts will require improving our understanding of gas phase formation and multi-phase flow subsequent to CO2 leakage in shallow aquifers. We are utilizing an integrated approach combining laboratory experiments and numerical simulations to characterize the multi-phase flow of CO2 in shallow aquifers. The laboratory experiments involve a series of highly controlled experiments in which CO2 dissolved water is injected in homogeneous and heterogeneous soil columns and tanks. The experimental results are used to study the effects of soil properties, temperature, pressure gradients and heterogeneities on gas formation and migration. We utilize the Finite Element Heat and Mass (FEHM) simulator (Zyvoloski et al., 2010) to numerically model the experimental results. The numerical models capture the physics of CO2 exsolution, multi-phase fluid flow as well as sand heterogeneity. Experimental observations of pressure, temperature and gas saturations are used to develop and constrain conceptual models for CO2 gas-phase formation and multi-phase CO2 flow in porous media. This talk will provide details of development of conceptual models based on experimental observation, development of numerical models for laboratory experiments and modeling results. JF - American Geophysical Union Fall Meeting AU - Pawar, Rajesh AU - Dash, Z AU - Sakaki, T AU - Plampin, M R AU - Lassen, R N AU - Illangasekare, Tissa H AU - Zyvoloski, G AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H54D EP - 01 PB - American Geophysical Union, Washington, DC VL - 2011 KW - soils KW - experimental studies KW - carbon sequestration KW - numerical models KW - solutes KW - porous materials KW - simulation KW - seepage KW - temperature KW - observations KW - ground water KW - carbon dioxide KW - aquifers KW - laboratory studies KW - finite element analysis KW - multiphase flow KW - shallow aquifers KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1765871993?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Numerical+modeling+of+experimental+observations+on+gas+formation+and+multi-phase+flow+of+carbon+dioxide+in+subsurface+formations&rft.au=Pawar%2C+Rajesh%3BDash%2C+Z%3BSakaki%2C+T%3BPlampin%2C+M+R%3BLassen%2C+R+N%3BIllangasekare%2C+Tissa+H%3BZyvoloski%2C+G%3BAnonymous&rft.aulast=Pawar&rft.aufirst=Rajesh&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2016-01-01 N1 - PubXState - DC N1 - Last updated - 2016-02-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; carbon dioxide; carbon sequestration; experimental studies; finite element analysis; ground water; laboratory studies; multiphase flow; numerical models; observations; porous materials; seepage; shallow aquifers; simulation; soils; solutes; temperature ER - TY - JOUR T1 - New developments in the Paris-Edinburgh Cell Program at HPCAT AN - 1739087225; 2015-113669 JF - American Geophysical Union Fall Meeting AU - Park, C AU - Kenney-Benson, C AU - Kono, Y AU - Shen, G AU - Yu, T AU - Sakamaki, T AU - Jing, Z AU - Wang, Y AU - Abd El Qader, M AU - Baker, J AU - Kumar, R AU - Velisavljevic, N AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract MR31A EP - 2189 PB - American Geophysical Union, Washington, DC VL - 2011 KW - tomography KW - imagery KW - technology KW - Paris-Edinburgh Cell Program KW - characterization KW - techniques KW - phase transitions KW - crystal structure KW - melts KW - temperature KW - chemical properties KW - X-ray analysis KW - chemical composition KW - pressure KW - three-dimensional models KW - thermal properties KW - resistivity KW - high pressure KW - diffraction KW - solid phase KW - radiography KW - physical properties KW - synchrotrons KW - reconstruction KW - anvil cells KW - minerals KW - high temperature KW - 01A:General mineralogy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1739087225?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=New+developments+in+the+Paris-Edinburgh+Cell+Program+at+HPCAT&rft.au=Park%2C+C%3BKenney-Benson%2C+C%3BKono%2C+Y%3BShen%2C+G%3BYu%2C+T%3BSakamaki%2C+T%3BJing%2C+Z%3BWang%2C+Y%3BAbd+El+Qader%2C+M%3BBaker%2C+J%3BKumar%2C+R%3BVelisavljevic%2C+N%3BAnonymous&rft.aulast=Park&rft.aufirst=C&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-12-04 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - anvil cells; characterization; chemical composition; chemical properties; crystal structure; diffraction; high pressure; high temperature; imagery; melts; minerals; Paris-Edinburgh Cell Program; phase transitions; physical properties; pressure; radiography; reconstruction; resistivity; solid phase; synchrotrons; techniques; technology; temperature; thermal properties; three-dimensional models; tomography; X-ray analysis ER - TY - JOUR T1 - Hydrodynamic and suspended sediment transport controls on river mouth morphology AN - 1734264994; 2015-107696 AB - The strikingly varied growth habits of river mouths building into standing bodies of water present a compelling pattern formation problem, which is also of great practical relevance for managing fragile coastal wetlands. Falcini and Jerolmack [2010] recently developed a novel potential vorticity (PV) theory to investigate the hydrodynamic conditions that form elongate channels in river deltas and lakes. Here we introduce a generalized 2.5-dimensional PV theory that relates sedimentation patterns to the internal vorticity and suspended sediment concentration fields within a sediment-laden jet. A key result is that lateral advection of sediment is directly proportional to internal jet vorticity, revealing how high-PV jets build elongated channels by focused levee deposition. A new analysis of experimental data shows that spatial variations in PV control sedimentation patterns at a river mouth. We derive a new bulk PV parameter, and demonstrate its ability to delineate channel morphologies of natural systems. JF - American Geophysical Union Fall Meeting AU - Falcini, F AU - Piliouras, A AU - Jerolmack, D J AU - Rowland, J C AU - Paola, C AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract EP52B EP - 02 PB - American Geophysical Union, Washington, DC VL - 2011 KW - hydrology KW - sediment transport KW - sedimentation KW - rivers and streams KW - channels KW - suspended materials KW - wetlands KW - transport KW - sedimentation rates KW - fluvial features KW - hydrodynamics KW - coastal environment KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1734264994?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Hydrodynamic+and+suspended+sediment+transport+controls+on+river+mouth+morphology&rft.au=Falcini%2C+F%3BPiliouras%2C+A%3BJerolmack%2C+D+J%3BRowland%2C+J+C%3BPaola%2C+C%3BAnonymous&rft.aulast=Falcini&rft.aufirst=F&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-11-19 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - channels; coastal environment; fluvial features; hydrodynamics; hydrology; rivers and streams; sediment transport; sedimentation; sedimentation rates; suspended materials; transport; wetlands ER - TY - JOUR T1 - Auto-acoustic compaction in granular shear flows; experimental evidence for suppression of shear dilatancy by internal acoustic vibration AN - 1729845820; 2015-100778 AB - Granular shear flows are intrinsic to many geophysical processes, ranging from landslides and debris flows to earthquake rupture on gouge-filled fault zones. The rheology of a granular flow depends strongly on the boundary conditions and shear rate. Earthquake rupture involves a runaway transition from quasi-static to rapid shear rates. Understanding the rheology of a granular flow in the transition is crucial for understanding the rupture process and the coseismic strength of faults. Here we explore this transition experimentally using an AR2000ex torsional rheometer. We measure the dilatation of a steady-state shear flow at velocities between 10 (super -3) and 10 (super 2) cm/s, and observe that shear dilatation is suppressed at intermediate velocities for angular sand particles, but not for smooth glass beads. With constant confining stress and increasing shear rate, the steady-state shear zone thickness progressively decreases between shear rates of 0.1-10 cm/s. With decreasing shear rate, the shear zone recovers its original thickness. The maximum reduction in thickness is on the order of 10% of the active shear zone thickness. Under constant-volume boundary conditions, this corresponds to a reduction of shear and normal stress of greater than 70%. The magnitude of compaction scales with the amplitude of shear-generated acoustic vibration, suggesting a link with the phenomenon of acoustic fluidization. We apply external acoustic vibration to confirm that the intermediate-velocity compaction reflects a feedback between acoustic vibration and rheology. The same magnitude of shear zone compaction is achieved for the same amplitude of vibration, regardless of whether it is internally or externally generated. We formulate a quantitative, semi-empirical model for steady-state shear zone thickness based on a balance between shear dilatation and "auto-acoustic" compaction. In this model, shearing drives dilatation of the granular medium away from random close packing, and acoustic vibration from grain-scale interactions drives the dilatation back down. At sufficiently rapid shear rates, acoustic vibration and compaction dominate over dilatation, and there is a transition from a velocity-independent quasi-static regime to a velocity-weakening acoustic flow regime. This transition occurs when the acoustic pressure is on the order of the confining pressure. For less "noisy" smooth grains, the inertial dispersive pressure is higher than the acoustic pressure at all shear rates, and the medium transitions directly from the quasi-static regime to the grain-inertial regime. The acoustic transition is achieved at shear rates four orders of magnitude below the range traditionally associated with the transition to dispersive granular flow. Scaled to seismogenic depths, this mechanism may be active if effective pressure is less than 10% of lithostatic. High-frequency energy radiated during rupture may therefore play a role in reducing the coseismic shear stress on a granular gouge-filled fault, as well as in weakening the fault ahead of a propagating rupture front. JF - American Geophysical Union Fall Meeting AU - van der Elst, N AU - Brodsky, E E AU - Johnson, P A AU - Le Bas, P AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract T11E EP - 04 PB - American Geophysical Union, Washington, DC VL - 2011 KW - fluid dynamics KW - debris flows KW - boundary conditions KW - landslides KW - rupture KW - coseismic processes KW - granular materials KW - rheology KW - mass movements KW - shear KW - vibration KW - lithostatic pressure KW - earthquakes KW - faults KW - acoustical waves KW - fault zones KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1729845820?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Auto-acoustic+compaction+in+granular+shear+flows%3B+experimental+evidence+for+suppression+of+shear+dilatancy+by+internal+acoustic+vibration&rft.au=van+der+Elst%2C+N%3BBrodsky%2C+E+E%3BJohnson%2C+P+A%3BLe+Bas%2C+P%3BAnonymous&rft.aulast=van+der+Elst&rft.aufirst=N&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-11-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - acoustical waves; boundary conditions; coseismic processes; debris flows; earthquakes; fault zones; faults; fluid dynamics; granular materials; landslides; lithostatic pressure; mass movements; rheology; rupture; shear; vibration ER - TY - JOUR T1 - Temporal changes in velocity and recurrence due to slip and triggered slip AN - 1722154654; 2015-097090 AB - Temporal elastic change within and adjacent to a fault zone can be (are always?) induced by slip. The temporal change is manifest as a velocity change followed by a long recovery process to the original equilibrium, or a new equilibrium, velocity. These changes are observed for both stick-slip and slow-slip, as well as triggered stick-slip and slow-slip. Based on laboratory and field observations, there is also a change in earthquake recurrence at slip and triggered slip time, that recovers together with the velocity to the original, or a new, equilibrium. The change in recurrence is the well known empirical Omori's law; however, we understand this behavior in the context of frictional physics. Laboratory studies suggest that both static stress change and/or nonlinear dynamical shaking of the volume in and around the slip event are responsible for the observed effects. The recovery process is due to material creep and/or slow dynamics, depending on the nature of the forcing [creep is induced from static stress change and slow dynamics is induced by dynamic shaking] (Guyer and Johnson, 2009). The change in velocity and/or recurrence may be proxies for a slip event. JF - American Geophysical Union Fall Meeting AU - Johnson, P A AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S23D EP - 03 PB - American Geophysical Union, Washington, DC VL - 2011 KW - Omori's law KW - stress KW - plastic deformation KW - friction KW - slip rates KW - deformation KW - dynamics KW - velocity structure KW - dislocation creep KW - earthquakes KW - faults KW - fault zones KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1722154654?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Temporal+changes+in+velocity+and+recurrence+due+to+slip+and+triggered+slip&rft.au=Johnson%2C+P+A%3BAnonymous&rft.aulast=Johnson&rft.aufirst=P&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-10-15 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - deformation; dislocation creep; dynamics; earthquakes; fault zones; faults; friction; Omori's law; plastic deformation; slip rates; stress; velocity structure ER - TY - JOUR T1 - Probing the august 2009 Hemet triggered tremor source applying time-reversal AN - 1722153282; 2015-097068 AB - We investigate an episode of non-volcanic tremor triggered along the San Jacinto segment by the 2009 M6.9 Gulf of California earthquake near the town of Hemet, South California. We apply Time Reversal (TR), a method that is emerging as a powerful tool for locating emergent continuous-wave signals such as tremor (Larmat et al., 2010). When time-reversed and emitted from the detector location, an arbitrary time segment will back-propagate to the source, in complex as well as simple media. When TR is applied to seismic data, the back-propagation takes place in a velocity model. Here we use a detailed model of Southern California from Suss & Shaw (2003) and employ the Spectral Element Method for back-propagation. TR pinpoints a source location at 22 km and about 4 km SW from the exposed San Jacinto fault scarp, as a coherent source of tremor energy. The current resolution of our TR inversion (up to 3.5 Hz or approximately 1.5 km) allows us to distinguish successive localizations of energy, indicating successive episodes of energy emmissions from the source area. We are also performing complementary studies based on short term/long term average analysis and cross-correlation. We expect that the combination of these different data processing techniques with different resolution will help to refine the TR results. We gratefully acknowledge the support of the U. S. Department of Energy through the Institutional Support (LDRD) at Los Alamos National Laboratory. We thanks J. Brown and G. Beroza for helpful discussions and sharing data. JF - American Geophysical Union Fall Meeting AU - Larmat, Carene S AU - Johnson, P A AU - Guyer, R A AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S23B EP - 2266 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - Gulf of California earthquake 2009 KW - monitoring KW - statistical analysis KW - Riverside California KW - Riverside County California KW - seismic sources KW - Hemet California KW - models KW - California KW - San Jacinto Fault KW - tremors KW - detection KW - crosscorrelation KW - velocity KW - seismic energy KW - earthquakes KW - faults KW - crust KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1722153282?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Probing+the+august+2009+Hemet+triggered+tremor+source+applying+time-reversal&rft.au=Larmat%2C+Carene+S%3BJohnson%2C+P+A%3BGuyer%2C+R+A%3BAnonymous&rft.aulast=Larmat&rft.aufirst=Carene&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-10-15 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - California; crosscorrelation; crust; detection; earthquakes; faults; Gulf of California earthquake 2009; Hemet California; models; monitoring; Riverside California; Riverside County California; San Jacinto Fault; seismic energy; seismic sources; statistical analysis; tremors; United States; velocity ER - TY - JOUR T1 - Incorporating 3-D subsurface hydrologic processes within the Community Land Surface Model (CLM); coupling PFLOTRAN and CLM AN - 1707528691; 2015-079462 AB - Numerous studies have shown a positive soil moisture-rainfall feedback through observational data, as well as, modeling studies. Spatial variability of topography, soils, and vegetation play a significant role in determining the response of land surface states (soil moisture) and fluxes (runoff, evapotranspirtiaon); but their explicit accounting within Land Surface Models (LSMs) is computationally expensive. Additionally, anthropogenic climate change is altering the hydrologic cycle at global and regional scales. Characterizing the sensitivity of groundwater recharge is critical for understanding the effects of climate change on water resources. In order to explicitly represent lateral redistribution of soil moisture and unified treatment of the unsaturated-saturated zone in the subsurface within the CLM, we propose coupling PFLOTRAN and CLM. PFLOTRAN is a parallel multiphase-multicomponent subsurface reactive flow and transport code for modeling subsurface processes and has been developed under a DOE SciDAC-2 project. PFLOTRAN is written in Fortran 90 using a modular, object-oriented approach. PFLOTRAN utilizes fully implicit time-stepping and is built on top of the Portable, Extensible Toolkit for Scientific Computation (PETSc). The PFLOTRAN model is capable of simulating fluid flow through porous media with fluid phases of air, water, and supercritical CO2. PFLOTRAN has been successfully employed on up to 131,072 cores on Jaguar, the massively parallel Cray XT4/XT5 at ORNL, for problems composed of up to 2 billion degrees of freedom. In this work, we will present a strategy of coupling the two models, CLM and PFLOTRAN, along with a few preliminary results obtained from the coupled model. JF - American Geophysical Union Fall Meeting AU - Bisht, G AU - Mills, R T AU - Hoffman, F M AU - Thornton, P E AU - Lichtner, P C AU - Hammond, G E AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H41C EP - 1046 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - hydrology KW - water quality KW - Everglades KW - rainfall KW - biochemistry KW - phosphorus KW - ecosystems KW - vegetation KW - simulation KW - Florida KW - evapotranspiration KW - ground water KW - geochemical cycle KW - recharge KW - wetlands KW - sensitivity analysis KW - water treatment KW - climate effects KW - hydrodynamics KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707528691?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Incorporating+3-D+subsurface+hydrologic+processes+within+the+Community+Land+Surface+Model+%28CLM%29%3B+coupling+PFLOTRAN+and+CLM&rft.au=Bisht%2C+G%3BMills%2C+R+T%3BHoffman%2C+F+M%3BThornton%2C+P+E%3BLichtner%2C+P+C%3BHammond%2C+G+E%3BAnonymous&rft.aulast=Bisht&rft.aufirst=G&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - biochemistry; climate effects; ecosystems; evapotranspiration; Everglades; Florida; geochemical cycle; ground water; hydrodynamics; hydrology; phosphorus; rainfall; recharge; sensitivity analysis; simulation; United States; vegetation; water quality; water treatment; wetlands ER - TY - JOUR T1 - Iron geochemistry of the mantle AN - 1707524519; 2015-082926 AB - The Fe/Mg ratio is an important constraint on the compositionally controlled density of the mantle. However, this ratio cannot be inferred from erupted lavas from OIB or MORB sources, but must be determined directly from mantle peridotites. Recently, the Fe/Mn ratio of erupted lavas has been used as an indicator of potential Fe variability in the mantle driven by core-mantle interaction, recycled oceanic crust, or even variations in the temperature of mantle melting. The classic compilation of McDonough & Sun (1995) provided the currently accepted Fe/Mn ratio of the upper mantle, 60+ or -10. The uncertainty on this ratio allows for 15-30% variability in mantle iron abundances, which is equivalent to a density variation larger than observed by seismic tomography in the mantle. To better understand the relationship between mantle peridotites and erupted lavas, and to search for real variability in the Fe/Mn ratio of mantle peridotites, we report precise new ICP-MS measurements of the transition element geochemistry of suites of mantle xenoliths that have known Fe/Mg ratios. For 12 Kilbourne Hole xenoliths, we observe a clear correlation between Fe/Mn and MgO (or Fe/Mg) over an Fe/Mn range of 59-72. Extrapolation of this trend to a Primitive Mantle (PM) MgO content of 37.8 yields an Fe/Mn of 59+ or -1 for the PM. Our new analyses of KLB-1 powder and fused glass beads yield an Fe/Mn of 61.4 for both samples, which plots on the Kilbourne Hole Fe/Mn vs. MgO trend. A set of ten xenoliths from San Carlos yield a wide range of Fe/Mn (56-65) not correlated with MgO content. The San Carlos xenoliths may have experienced a metasomatic effect that imprinted variable Fe/Mn. A clinopyroxene-rich lithology from San Carlos yields an Fe/Mn of 38, which plots on an extension of the Kilbourne Hole Fe/Mn vs. MgO trend. These new results, and those from other xenolith localities being measured in our lab, provide new constraints on the compositional variability of the Earth's upper mantle. McDonough, W. F. & Sun, S. S. (1995) Chem. Geol. 120, 223-253. JF - American Geophysical Union Fall Meeting AU - Humayun, M AU - Campbell, T J AU - Brandon, A D AU - Davis, F A AU - Hirschmann, M M AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract U41A EP - 0008 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - magnesium KW - Fe/Mn KW - igneous rocks KW - mass spectra KW - mantle KW - Dona Ana County New Mexico KW - New Mexico KW - manganese KW - iron KW - plutonic rocks KW - inclusions KW - magnesium oxides KW - Fe/Mg KW - oxides KW - spectra KW - chemical composition KW - xenoliths KW - alkaline earth metals KW - ultramafics KW - ICP mass spectra KW - lava KW - metals KW - Arizona KW - peridotites KW - Gila County Arizona KW - Kilbourne Hole KW - San Carlos Arizona KW - 18:Solid-earth geophysics KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707524519?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Iron+geochemistry+of+the+mantle&rft.au=Humayun%2C+M%3BCampbell%2C+T+J%3BBrandon%2C+A+D%3BDavis%2C+F+A%3BHirschmann%2C+M+M%3BAnonymous&rft.aulast=Humayun&rft.aufirst=M&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/U/sessions/U41A/abstracts/U41A-0008.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - Number of references - 1 N1 - PubXState - DC N1 - SuppNotes - Accessed on Sept. 10, 2014 N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - alkaline earth metals; Arizona; chemical composition; Dona Ana County New Mexico; Fe/Mg; Fe/Mn; Gila County Arizona; ICP mass spectra; igneous rocks; inclusions; iron; Kilbourne Hole; lava; magnesium; magnesium oxides; manganese; mantle; mass spectra; metals; New Mexico; oxides; peridotites; plutonic rocks; San Carlos Arizona; spectra; ultramafics; United States; xenoliths ER - TY - JOUR T1 - Does the Fe2+ spin-crossover in Pv and Fp account for the properties and dynamics of the deep mantle? AN - 1707523588; 2015-082777 AB - The discovery of the high pressure (HP) induced spin crossover in pure wustite (Fe0.94O)--a high-spin (HS) to low spin (LS) behavior led to a number of experimental and theoretical studies regarding the implication of this electronic transition upon the structure and dynamics in the lower/upper mantle boundaries. As a result of the collapse of the d-d electronic repulsion present in the high-spin state (S=2), it is expected that within the structural transition the FeLS-O bond-length in Pv Mg1-yFeySiO3) and Fp (Mg1-xFexO) will decrease, resulting in a volume contraction. Based on several HP XRD experimental studies by us and others in species containing Fe2+-O such as in Fp (1>x>0.15), Fe2+-Cl (FeCl2), and Fe2+-S (FeCr2S4), we conclude that the onset of any resulting volume contractions and their respective magnitudes are very small, well within the experimental errors of various physical parameters used in the theoretical simulation of the Earth dynamics. Another parameter attributed to the electronic transition, viz. the bulk modulus K0 of the LS phase is claimed to be larger than that of the HS phase suggesting a "hardening" of phonon density of states. However the enhanced lack of sample hydrostaticity with pressure increase could also lead an artificial larger K0. The several experimental inconsistencies together with insignificant crystallographic changes upon the spin transition may propose an alternative explanation of the seismological observations at upper-lower mantle boundary JF - American Geophysical Union Fall Meeting AU - Pasternak, M P AU - Jeanloz, R AU - Taylor, R D AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract MR43B EP - 2141 PB - American Geophysical Union, Washington, DC VL - 2011 KW - experimental studies KW - pressure KW - mantle KW - high pressure KW - iron KW - ferrous iron KW - molecular structure KW - lower mantle KW - metals KW - oxides KW - crystallography KW - wustite KW - dynamic properties KW - 17A:General geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707523588?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Does+the+Fe2%2B+spin-crossover+in+Pv+and+Fp+account+for+the+properties+and+dynamics+of+the+deep+mantle%3F&rft.au=Pasternak%2C+M+P%3BJeanloz%2C+R%3BTaylor%2C+R+D%3BAnonymous&rft.aulast=Pasternak&rft.aufirst=M&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - crystallography; dynamic properties; experimental studies; ferrous iron; high pressure; iron; lower mantle; mantle; metals; molecular structure; oxides; pressure; wustite ER - TY - JOUR T1 - High-resolution 3-D upper mantle seismic and density imaging beneath the Southern Rocky Mountains from simultaneous inversion of body waves, Bouguer gravity, and surface waves AN - 1707523475; 2015-082852 AB - The simultaneous inversion of datasets with complementary model sensitivities is a natural approach to reduce the ill-posedness common in many geophysical inversions. The application of joint methods, however, compounds some of the complexity issues associated with traditional inversions, such as regularization selection and optimization criteria, as well as introduces new ones, such as relative dataset weighting and multiparameter coupling. We discuss these challenges in the context of a simultaneous inversion of teleseismic body waves, Bouguer gravity, and surface waves for 3-D models of mantle structure beneath the southern Rocky Mountains from the CREST project. We employ a seismically derived a priori crustal model to correct seismic and gravity datasets for crustal travel time and density variations to produce images of upper mantle velocity. An iterative, nonlinear, joint inversion methodology is discussed for simultaneously inverting the three data sets. Parameter coupling between seismic velocity and density is implemented using an approximately linear relationship. Data are scaled by respective estimated errors, but relative dataset weighting is also varied to achieve optimal balance. Changes in solution and its resolution features are investigated following the addition of each data set. JF - American Geophysical Union Fall Meeting AU - MacCarthy, J K AU - Aster, R C AU - Stachnik, J C AU - Hansen, S M AU - Dueker, K G AU - Rowe, C A AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S43D EP - 02 PB - American Geophysical Union, Washington, DC VL - 2011 KW - upper mantle KW - North America KW - high-resolution methods KW - body waves KW - density KW - three-dimensional models KW - geophysical methods KW - mantle KW - elastic waves KW - simulation KW - deep-seated structures KW - gravity methods KW - gravity anomalies KW - Southern Rocky Mountains KW - Bouguer anomalies KW - seismic waves KW - lower crust KW - Rocky Mountains KW - crust KW - 19:Seismology KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707523475?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=High-resolution+3-D+upper+mantle+seismic+and+density+imaging+beneath+the+Southern+Rocky+Mountains+from+simultaneous+inversion+of+body+waves%2C+Bouguer+gravity%2C+and+surface+waves&rft.au=MacCarthy%2C+J+K%3BAster%2C+R+C%3BStachnik%2C+J+C%3BHansen%2C+S+M%3BDueker%2C+K+G%3BRowe%2C+C+A%3BAnonymous&rft.aulast=MacCarthy&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - body waves; Bouguer anomalies; crust; deep-seated structures; density; elastic waves; geophysical methods; gravity anomalies; gravity methods; high-resolution methods; lower crust; mantle; North America; Rocky Mountains; seismic waves; simulation; Southern Rocky Mountains; three-dimensional models; upper mantle ER - TY - JOUR T1 - Dynamic measures of elastic nonlinear (anelastic) behavior; Dynamic Acousto-Elasticity Testing (DAET) AN - 1707523265; 2015-082780 AB - Unraveling the physics of the earthquake source, reliable sequestration of CO2, predicting wellbore breakout in oil and gas reservoirs, monitoring thermal damage to rock in nuclear waste storage, and probing cement integrity require new approaches to material characterization and imaging. The elastic nonlinear material response is extremely promising in this regard. A persistent problem has been the direct relation between elastic nonlinearity and mechanical damage, because a reliable physics-based theory does not yet exist; however, recent work in medical nonlinear acoustics has led to an experimental breakthrough in measuring material nonlinear response. The breakthrough, termed Dynamic Acousto-Elasticity Testing (e.g., Renaud et al, 2008), has significant implication to development of a physics based theory, and thus ultimately to our ability to directly relate nonlinear material behavior to damage. The method provides the means to dynamically study the velocity-pressure and attenuation-pressure behaviors through the full wave cycle in contrast to most methods that measure average response (e.g., Nonlinear Resonance Ultrasound Spectroscopy [e.g., Guyer and Johnson, 2009]). The method relies on exciting a sample with a low frequency vibration in order to cycle it through stress-strain multiple times. Simultaneously, a high frequency ultrasonic source applies pulses and the change in wavespeed as a function of the low frequency stress is measured. In crystalline rock, we expect that the elastic nonlinearity arises from the microcracks and dislocations contained within individual crystals. In contrast, sandstones, limestones and other sedimentary rocks may have other origin(s) of elastic nonlinearity that are currently under debate. Thus we can use a crystalline sample as a point of reference from which to extrapolate to other sources of nonlinear mechanisms. We report results from our preliminary studies applying a number of room-dry rock samples of differing rock type including Berkeley Blue granite. We observe relatively simple nonlinear and hysteretic behavior in the granite. In other samples that include limestones and sandstones we observe behaviors that can differ markedly from the granite. We will use this information to infer differences in the nonlinear origin of these materials. We also observe changes in the calculated nonlinear coefficients that are wave-strain amplitude dependent as a result of acoustically-induced reversible conditioning. By integrating the velocity-stress data, we can extract the dynamic stress-strain behavior. The approach promises to provide the means for a major advance in this area of study. JF - American Geophysical Union Fall Meeting AU - Renaud, G AU - Le Bas, P AU - Ten Cate, J A AU - Ulrich, T J AU - Carey, J W AU - Han, Jiabin AU - Darling, T W AU - Johnson, P A AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract MR51A EP - 2151 PB - American Geophysical Union, Washington, DC VL - 2011 KW - limestone KW - hysteresis KW - sandstone KW - plastic deformation KW - rock mechanics KW - reservoir rocks KW - radioactive waste KW - acoustical methods KW - sedimentary rocks KW - vibration KW - dislocation creep KW - carbon sequestration KW - thermal properties KW - stress KW - geophysical methods KW - prediction KW - mechanical properties KW - deformation KW - physical properties KW - waste disposal KW - carbonate rocks KW - earthquakes KW - clastic rocks KW - underground disposal KW - 06A:Sedimentary petrology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707523265?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Dynamic+measures+of+elastic+nonlinear+%28anelastic%29+behavior%3B+Dynamic+Acousto-Elasticity+Testing+%28DAET%29&rft.au=Renaud%2C+G%3BLe+Bas%2C+P%3BTen+Cate%2C+J+A%3BUlrich%2C+T+J%3BCarey%2C+J+W%3BHan%2C+Jiabin%3BDarling%2C+T+W%3BJohnson%2C+P+A%3BAnonymous&rft.aulast=Renaud&rft.aufirst=G&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - acoustical methods; carbon sequestration; carbonate rocks; clastic rocks; deformation; dislocation creep; earthquakes; geophysical methods; hysteresis; limestone; mechanical properties; physical properties; plastic deformation; prediction; radioactive waste; reservoir rocks; rock mechanics; sandstone; sedimentary rocks; stress; thermal properties; underground disposal; vibration; waste disposal ER - TY - JOUR T1 - Soil subsidence associated with Arctic permafrost degradation AN - 1707521604; 2015-082903 AB - Arctic sources of greenhouse gas associated with permafrost degradation constitute a large uncertainty in existing climate models. Greenhouse gas release from the arctic subsurface is mediated by numerous interconnected biogeochemical processes; one facet of these is the interplay between surface deformation and melting of subsurface ice. First, we construct analytic solutions describing fluid drainage and soil subsidence subsequent to thawing of a 1D permafrost column. The time scale for subsidence is governed by a dimensionless group containing the depth to the drainage route and the average permeability. The maximum surface subsidence is determined by the initial and final soil porosities. Second, we numerically model an initially frozen, fluid saturated, porous, 2D matrix with a subsequent thaw zone advancing from the surface downward. We include an ice-rich region by setting the porosity in a 10 X 20 m (super 2) rectangular shaped region near the surface to twice that of the surrounding medium (0.6 vs 0.3). With the surface temperature fixed at 5 degrees C, a thaw front propagates to approximately 10 m depth within 20 years and, due primarily to drainage of fluid from the pore space, a zone of soil depressed by approximately 4.5 meters forms above the initially ice-rich zone. Soil underlying this depressed zone has its permeability reduced by between one and two orders of magnitude; this reduction in permeability can act as a negative feedback to thawing. We obtain qualitatively similar results when the subsurface ice-rich region has spatially sinusoidal variation. JF - American Geophysical Union Fall Meeting AU - Rapaka, S AU - Lewis, K C AU - Zyvoloski, G AU - Wilson, C J AU - Travis, B J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract U33A EP - 0029 PB - American Geophysical Union, Washington, DC VL - 2011 KW - soils KW - permafrost KW - degradation KW - numerical models KW - geologic hazards KW - drainage KW - land subsidence KW - thawing KW - porosity KW - temperature KW - natural hazards KW - greenhouse gases KW - permeability KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1707521604?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Soil+subsidence+associated+with+Arctic+permafrost+degradation&rft.au=Rapaka%2C+S%3BLewis%2C+K+C%3BZyvoloski%2C+G%3BWilson%2C+C+J%3BTravis%2C+B+J%3BAnonymous&rft.aulast=Rapaka&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/U/sessions/U33A/abstracts/U33A-0029.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - SuppNotes - Accessed on Sept. 9, 2014 N1 - Last updated - 2015-08-27 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - degradation; drainage; geologic hazards; greenhouse gases; land subsidence; natural hazards; numerical models; permafrost; permeability; porosity; soils; temperature; thawing ER - TY - JOUR T1 - Seismic and gravity investigation of the eastern boundary of the Santo Domingo Basin, Rio Grande Rift, New Mexico AN - 1703685784; 2015-077217 AB - New seismic refraction/wide-angle reflection and CMP seismic reflection profiles were recorded by the SAGE (Summer of Applied Geophysical Experience) program across the eastern boundary of the Santo Domingo basin, Rio Grande rift, New Mexico in 2010 and 2011. In addition, new gravity data were acquired along the seismic lines, in the area of the eastern boundary and in the Santo Domingo basin. A complete Bouguer gravity anomaly map was produced from the new gravity measurements and previously existing gravity data. Two and one half dimensional modeling of approximately east-west Bouguer anomaly profiles was used to estimate basin depth and fault offsets at the eastern boundary of the Santo Domingo basin and to compare with the seismic reflection interpretations. The refraction and wide-angle reflection data were modeled using slope-intercept, 2-D ray trace and wide-angle dipping layer reflection travel times. Typical velocities for the Tertiary layers are approximately 750 m/s, 2000 m/s and 2400 m/s. Deconvolution, bandpass filtering, velocity analysis and CMP stacking were utilized to produce seismic reflection sections for the east-west reflection profiles from 2010 and 2011. The reflection data imaged the La Bajada and San Francisco faults along the eastern boundary of the Santo Domingo basin. These data and available industry reflection data to the east of our field area indicate offsets of greater than 2 km for the La Bajada fault (down to the west) and about 1 km of offset for the San Francisco fault (down to the west). Using constraints from the seismic data on depth to Tertiary and Mesozoic sedimentary units, the gravity modeling suggests a depth to crystalline basement of over 5 km in the Santo Domingo basin. JF - American Geophysical Union Fall Meeting AU - Braile, L W AU - Bailey, B L AU - Bailey, J AU - Buening, J AU - Christianson, R AU - Davy, R AU - Judy, B AU - Kiyan, D AU - Kordy, M A AU - Pazos, C AU - Roza, J AU - Wilks, M AU - Worthington, J AU - Baldridge, W S AU - Biehler, S AU - Ferguson, J F AU - McPhee, D K AU - Snelson, C M AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract T21A EP - 2316 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - North America KW - lithostratigraphy KW - San Francisco Fault KW - geophysical methods KW - basement KW - reflection methods KW - elastic waves KW - New Mexico KW - refraction methods KW - two-dimensional models KW - seismic methods KW - Santo Domingo Basin KW - Rio Grande Rift KW - models KW - wide-angle methods KW - gravity anomalies KW - deconvolution KW - traveltime KW - ray tracing KW - Bouguer anomalies KW - tectonics KW - faults KW - 16:Structural geology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1703685784?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Seismic+and+gravity+investigation+of+the+eastern+boundary+of+the+Santo+Domingo+Basin%2C+Rio+Grande+Rift%2C+New+Mexico&rft.au=Braile%2C+L+W%3BBailey%2C+B+L%3BBailey%2C+J%3BBuening%2C+J%3BChristianson%2C+R%3BDavy%2C+R%3BJudy%2C+B%3BKiyan%2C+D%3BKordy%2C+M+A%3BPazos%2C+C%3BRoza%2C+J%3BWilks%2C+M%3BWorthington%2C+J%3BBaldridge%2C+W+S%3BBiehler%2C+S%3BFerguson%2C+J+F%3BMcPhee%2C+D+K%3BSnelson%2C+C+M%3BAnonymous&rft.aulast=Braile&rft.aufirst=L&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-08-13 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - basement; Bouguer anomalies; deconvolution; elastic waves; faults; geophysical methods; gravity anomalies; lithostratigraphy; models; New Mexico; North America; ray tracing; reflection methods; refraction methods; Rio Grande Rift; San Francisco Fault; Santo Domingo Basin; seismic methods; tectonics; traveltime; two-dimensional models; United States; wide-angle methods ER - TY - JOUR T1 - Neutron reflectometry at elevated pressures and temperatures; novel P-T cell and preliminary experiments AN - 1703685619; 2015-077295 AB - Processes at mineral-fluid interfaces control a wide-range of phenomena of crucial importance in energy and environmental applications, including fluid flow, mineral precipitation and dissolution, and corrosion and scaling. In geological systems, geothermal energy production, CO2 sequestration, oil and gas production, and nuclear reactors and waste repositories, these critical mineral-fluid interactions occur at high pressures (P) and temperatures (T). Unfortunately the details of these phenomena are poorly understood because of the technical difficulties with conducting in-situ investigations of mineral/fluid interfaces at relevant geological conditions. Neutron reflectometry offers the possibility of studying fluid/solid processes in-situ at elevated Ps and Ts. In neutron reflectometry an unpolarized neutron beam (wavelength 1.5 to 16 Aa) is directed at a solid/fluid (or other) interface at a glancing angle and a range of momentum transfer vectors (Q) are measured elucidating changes in material layering and fluid density within a few dozen Aa of the solid/liquid interface. Neutron reflectometry is an ideal technique for investigating such processes at elevated P/T because neutrons are strongly penetrating and able to pass through robust, high P/T aluminum cells with minimal neutron attenuation. Additionally, neutrons are highly sensitive to deuterium due to its large neutron scattering cross section, allowing heavy water to be detected. Thus, neutron scattering has advantages over x-ray techniques, which cannot detect water and which cannot penetrate large-volume P cells. A new LANL neutron cell allows neutron reflectometry studies at conditions up to 200 degrees C and 200 MPa, corresponding to a crustal depth of 6 km. The 5 in. diameter cell is constructed of anodized AA7075 aluminum with a 2 in. diameter sample chamber. The neutron cell and P system can accommodate fluid environments varying in pH and mineral and CO2 saturations. Neutron reflectometry studies will elucidate the atomic scale interactions occurring at mineral-fluid interfaces, including fluid structures and precipitation and dissolution processes. Target systems for study include carbonates (calcite, siderite, magnesite, dolomite), salts (halite, sylvite), simple oxides (quartz, corundum, hematite, goethite, uraninite), micas, and steel. We will present details about the neutron cell theory, design, and applications, as well as data from the cell's initial usage during the 2011 LANSCE fall run cycle. JF - American Geophysical Union Fall Meeting AU - Hickmott, D AU - Lerner, A H AU - Wang, P AU - Majewski, J AU - Taylor, M AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract V21A EP - 2473 PB - American Geophysical Union, Washington, DC VL - 2011 KW - silicates KW - methods KW - chemically precipitated rocks KW - pressure KW - neutron methods KW - mineral-water interface KW - steel KW - high pressure KW - evaporites KW - temperature KW - sedimentary rocks KW - mica group KW - sheet silicates KW - carbonates KW - neutron reflectometry KW - instruments KW - high temperature KW - crust KW - salt KW - 17A:General geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1703685619?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Neutron+reflectometry+at+elevated+pressures+and+temperatures%3B+novel+P-T+cell+and+preliminary+experiments&rft.au=Hickmott%2C+D%3BLerner%2C+A+H%3BWang%2C+P%3BMajewski%2C+J%3BTaylor%2C+M%3BAnonymous&rft.aulast=Hickmott&rft.aufirst=D&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/V/sessions/V21A/abstracts/V21A-2473.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - SuppNotes - Accessed on Sept. 23, 2014 N1 - Last updated - 2015-08-13 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - carbonates; chemically precipitated rocks; crust; evaporites; high pressure; high temperature; instruments; methods; mica group; mineral-water interface; neutron methods; neutron reflectometry; pressure; salt; sedimentary rocks; sheet silicates; silicates; steel; temperature ER - TY - JOUR T1 - Decision analyses for optimization of monitoring networks based on uncertainty quantification of model predictions of contaminant transport AN - 1686063025; 2015-050348 AB - Model-based decision making related to environmental management problems is a challenging problem. There has been substantial theoretical research and practical applications related to this problem. However, there are very few cases in which the actual decision analyses have been tested in the field to evaluate their adequacy. Over the last several years, we have performed a series of decision analyses to support optimization of a monitoring network at the Los Alamos National Laboratory (LANL) site. The problem deals with contaminant transport in the regional aquifer beneath the LANL site. At three separate stages, the existing monitoring network was augmented based on analyses of the existing uncertainties; in total, five new monitoring wells were proposed. At each stage, the data collected at the new monitoring wells demonstrated the adequacy of the prior uncertainty and decision analyses. The decision analyses required a detailed estimation of uncertainties in model predictions. Various uncertainties, including measurement errors and uncertainties in the conceptualization and model parameters, contributed to the uncertainties in the model predictions. The decision analyses were computationally intensive requiring on the order of one million model simulations; computational efficiency is achieved using (1) high-performance computing (LANL multiprocessor clusters), (2) novel computational techniques for model analysis, and (3) a simple analytical 3D simulator to simulate contaminant transport. Decision support related to optimal design of monitoring networks required optimization of the proposed new monitoring well locations in order to reduce existing model-prediction uncertainties and environmental risk. An important aspect of the analysis is the application of novel techniques for optimization (SQUADS based on coupling of Particle Swarm and Levenberg-Marquardt optimization methods; Vesselinov & Harp, 2011) and uncertainty quantification (ABAGUS: Agent-Based Analysis of Global Uncertainty and Sensitivity; Harp & Vesselinov; 2011). The novel techniques proved to be robust and computationally efficient. These techniques are bundled in a software package called MADS (Model Analyses for Decision Support; http://ees.lanl.gov/staff/monty/codes/mads). In our research, the code has been applied to perform global and local (1) sensitivity analyses, (2) model optimization (calibration and parameter estimation), (3) uncertainty quantification, and (4) decision analysis (Bayesian and non-Bayesian). JF - American Geophysical Union Fall Meeting AU - Vesselinov, V V AU - Harp, D AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H13B EP - 1201 PB - American Geophysical Union, Washington, DC VL - 2011 KW - water quality KW - monitoring KW - Bayesian analysis KW - pollutants KW - statistical analysis KW - prediction KW - pollution KW - optimization KW - decision-making KW - ground water KW - cluster analysis KW - aquifers KW - environmental management KW - transport KW - hydrodynamics KW - risk assessment KW - water pollution KW - uncertainty KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686063025?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Decision+analyses+for+optimization+of+monitoring+networks+based+on+uncertainty+quantification+of+model+predictions+of+contaminant+transport&rft.au=Vesselinov%2C+V+V%3BHarp%2C+D%3BAnonymous&rft.aulast=Vesselinov&rft.aufirst=V&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; Bayesian analysis; cluster analysis; decision-making; environmental management; ground water; hydrodynamics; monitoring; optimization; pollutants; pollution; prediction; risk assessment; statistical analysis; transport; uncertainty; water pollution; water quality ER - TY - JOUR T1 - Monitoring spatial and temporal variations in fracture networks using shear-wave splitting analysis AN - 1686062368; 2015-050296 AB - Passive seismic monitoring is used to infer fracturing in a range of settings including hydrocarbon reservoirs, mining environments and volcanological systems. However, most studies concentrate on simply locating microseismic events. Measurements of shear-wave splitting in such events provide unambiguous evidence of seismic anisotropy, which may be caused by the rock fabric and/or aligned fractures, which in turn offers insights into the state of stress in the rock. We present a strategy to automatically process shear-wave splitting in large microseismic datasets. This includes an objective quality control of the shear-wave splitting results, based on characteristic differences between two independent splitting techniques. Reliable measurements can be then used in inversion schemes for anisotropy parameters, including those controlled by rock fracturing. We demonstrate this fully automatic workflow with microseismic events recorded during a hydraulic fracture experiment in a tight gas reservoir in Carthage, East Texas. Events were recorded on two downhole arrays of 3-component sensors, the geometry of which provided good ray coverage for anisotropy analysis. A total of 16633 seismograms from 888 located events yielded 1570 well-constrained shear wave splitting measurements. We consider the anisotropy to be controlled by a sedimentary fabric with superimposed fractures and use the splitting measurements to invert for the orthorhombic anisotropic parameters of the rock mass, including the dominant fracture orientation and fracture density. The recovered fracture strike in the rock mass is parallel to directions of regional borehole breakout, but oblique to the hydraulic fracture corridor as mapped by the microseismic events. We relate this to en-echelon fracturing of pre-existing cracks. The magnitude of shear wave splitting shows a clear temporal increase during each pumping stage, indicating the generation of cracks and fissures in a halo around the fracture corridor, which thus increase the overall permeability of the rock mass. Our results show that shear wave splitting analysis can provide a useful tool for monitoring spatial and temporal variations in fracture networks in a range of environments. JF - American Geophysical Union Fall Meeting AU - Kendall, J M AU - Wuestefeld, A AU - Verdon, J AU - Rutledge, J T AU - Wookey, J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H12C EP - 03 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - networks KW - hydraulic fracturing KW - Panola County Texas KW - body waves KW - petroleum engineering KW - monitoring KW - stress KW - Texas KW - elastic waves KW - tight sands KW - spatial frequency filters KW - wave splitting KW - fractures KW - East Texas KW - microseisms KW - isotropy KW - reservoir properties KW - temporal distribution KW - seismic waves KW - Carthage Texas KW - S-waves KW - 19:Seismology KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686062368?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Monitoring+spatial+and+temporal+variations+in+fracture+networks+using+shear-wave+splitting+analysis&rft.au=Kendall%2C+J+M%3BWuestefeld%2C+A%3BVerdon%2C+J%3BRutledge%2C+J+T%3BWookey%2C+J%3BAnonymous&rft.aulast=Kendall&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - body waves; Carthage Texas; East Texas; elastic waves; fractures; hydraulic fracturing; isotropy; microseisms; monitoring; networks; Panola County Texas; petroleum engineering; reservoir properties; S-waves; seismic waves; spatial frequency filters; stress; temporal distribution; Texas; tight sands; United States; wave splitting ER - TY - JOUR T1 - Impacts of hydrologic and geochemical uncertainty on predicting uranium migration at the Hanford 300 area AN - 1686062334; 2015-050352 AB - In modeling the uranium migration within the Integrated Field Research Challenge (IFRC) site at the Hanford 300 Area, the model simulations are affected by both the hydrologic and geochemical uncertainties. This study investigates the propagation of both types of uncertainty in the simulation of a uranium desorption experiment using a Monte-Carlo framework. The hydrologic uncertainty arises from estimating the transient flow boundary conditions induced by the dynamics in the Columbia River and the underlying heterogeneous hydraulic conductivity field, while the geochemical uncertainty is a result of limited knowledge in the geochemical reaction processes that take place in field and heterogeneity in source terms and reaction coefficients. We also evaluated the effectiveness of various conditioning data in reducing the uncertainty in the simulated uranium plume. For example, identifying the optimal boundary condition and estimating the 3D hydraulic conductivity field through inversion of concurrent conservative tracer test, and exploring the possibility of including the geophysical and geochemical data available at the site to characterize hydrologic and geochemical heterogeneities. The multi-realization capability of the parallel simulator, PFLOTRAN, enables this computationally demanding task to be completed within a reasonable turn-around time. JF - American Geophysical Union Fall Meeting AU - Chen, X AU - Hammond, G E AU - Lichtner, P C AU - Rockhold, M L AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H13B EP - 1206 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - water quality KW - migration KW - Washington KW - monitoring KW - pollutants KW - Monte Carlo analysis KW - statistical analysis KW - prediction KW - pollution KW - Hanford Site KW - simulation KW - boundary conditions KW - transient phenomena KW - metals KW - geochemical anomalies KW - uranium KW - hydraulic conductivity KW - actinides KW - heavy metals KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686062334?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Impacts+of+hydrologic+and+geochemical+uncertainty+on+predicting+uranium+migration+at+the+Hanford+300+area&rft.au=Chen%2C+X%3BHammond%2C+G+E%3BLichtner%2C+P+C%3BRockhold%2C+M+L%3BAnonymous&rft.aulast=Chen&rft.aufirst=X&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - actinides; boundary conditions; geochemical anomalies; Hanford Site; heavy metals; hydraulic conductivity; metals; migration; monitoring; Monte Carlo analysis; pollutants; pollution; prediction; simulation; statistical analysis; transient phenomena; United States; uranium; Washington; water quality ER - TY - JOUR T1 - Uncertainty quantification of the leaked CO2 from deep reservoirs to shallow groundwater AN - 1686061799; 2015-050356 AB - One of the areas of concerns for geologic CO2 sequestration is the potential of leakage of CO2 as well as deeper brines from deeper storage reservoirs to shallow groundwater resources. This could lead to changes in groundwater chemistry. As part of the National Risk Assessment Partnership (NRAP) for geologic CO2 sequestration project, we perform modeling studies to understand the mechanisms of the leaked CO2 flow, transport and reaction with aquifer water and minerals. The goal of these studies is to capture the complex multi-phase flow and multi-component reactive transport processes and the effect of uncertain parameters in form of a response surface. The response surface will be used in a quantitative risk assessment framework for developing risk profiles related to CO2 leakage. We have developed a 3-dimensional heterogeneous numerical model for an un-confined shallow aquifer that is being used to simulate the CO2 leakage and the associated geochemical interactions over 100 years. We perform a Monte-Carlo analysis to (1) estimate the probability and quantity of the CO2 leakage from water table while not taking into account the reactions of CO2 with the shallow groundwater and minerals; (2) estimate the probability and plume size of the pH below 6.5 in the shallow aquifer while taking into account the reactions of CO2 with the chemical components and the major minerals. There are five uncertain parameters in our study including three for describing geologic heterogeneity in the permeability (sill, integral range, anisotropic factor) and two for multi-phase flow (lateral groundwater flow rate and CO2 leakage rate). A global sensitivity analysis is conducted for three outputs (the amount of CO2 leaving the top of aquifer, the plume size of pH below 6.5 and the fraction of aquifer volume at pH below 6.5 as a function of time) with the MARS screen method and Sobol main-effect method using PSUADE (Tong, 2011). Finally, we will present one-, two- and three-dimensional response surfaces developed based on the 500 forward modeling results of reactive transport models. JF - American Geophysical Union Fall Meeting AU - Dai, Z AU - Keating, E H AU - Viswanathan, H S AU - Zyvoloski, G AU - Pawar, R J AU - Bacon, D H AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H13B EP - 1210 PB - American Geophysical Union, Washington, DC VL - 2011 KW - three-dimensional models KW - statistical analysis KW - pollution KW - porosity KW - ground water KW - carbon dioxide KW - aquifers KW - transport KW - sensitivity analysis KW - reactive transport KW - shallow aquifers KW - risk assessment KW - probability KW - unconfined aquifers KW - uncertainty KW - permeability KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686061799?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Uncertainty+quantification+of+the+leaked+CO2+from+deep+reservoirs+to+shallow+groundwater&rft.au=Dai%2C+Z%3BKeating%2C+E+H%3BViswanathan%2C+H+S%3BZyvoloski%2C+G%3BPawar%2C+R+J%3BBacon%2C+D+H%3BAnonymous&rft.aulast=Dai&rft.aufirst=Z&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; carbon dioxide; ground water; permeability; pollution; porosity; probability; reactive transport; risk assessment; sensitivity analysis; shallow aquifers; statistical analysis; three-dimensional models; transport; uncertainty; unconfined aquifers ER - TY - JOUR T1 - Methods for assessing chances of rare, high-consequence events in groundwater monitoring AN - 1686059040; 2015-045784 AB - This paper addresses the relative merits of two approaches for uncertainty analysis in support of risk assessment: the first targeted at predicting probabilities of future outcomes over the full range of plausible parameter space, the second targeted at predicting the likelihood of worst-case or failure scenarios. Both types of predictions are useful for risk assessment, and both can be subjected to uncertainty analysis. However, the computational cost of calculating probabilities for rare failure scenarios may be prohibitive for all but the most simple numerical or analytical models. This is especially true for highly parameterized and/or strongly non-linear models. Our analysis compares these two approaches using disparate state-of-the-art methodologies, including Monte Carlo, Null-Space Monte Carlo, local and global optimization, and ensemble Kalman filters. With each method, we compare the performance of the computationally-expensive model with a derived, reduced-order model. The example application is 3D solute transport through a heterogeneous aquifer with head and concentration measurements available in limited locations. Results highlight the limitations of reduced-order models in informing decisions where risk of failure is an important metric. This study also demonstrates the importance of customizing the uncertainty analysis method to the class of problem at hand. JF - American Geophysical Union Fall Meeting AU - Higdon, D M AU - Keating, E H AU - Dai, Z AU - Gattiker, J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H23D EP - 1300 PB - American Geophysical Union, Washington, DC VL - 2011 KW - solute transport KW - aquifer vulnerability KW - water quality KW - monitoring KW - Monte Carlo analysis KW - statistical analysis KW - Kalman filters KW - prediction KW - pollution KW - decision-making KW - measurement KW - ground water KW - aquifers KW - transport KW - risk assessment KW - hydraulic conductivity KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686059040?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Methods+for+assessing+chances+of+rare%2C+high-consequence+events+in+groundwater+monitoring&rft.au=Higdon%2C+D+M%3BKeating%2C+E+H%3BDai%2C+Z%3BGattiker%2C+J%3BAnonymous&rft.aulast=Higdon&rft.aufirst=D&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifer vulnerability; aquifers; decision-making; ground water; hydraulic conductivity; Kalman filters; measurement; monitoring; Monte Carlo analysis; pollution; prediction; risk assessment; solute transport; statistical analysis; transport; water quality ER - TY - JOUR T1 - Effect of spatially and temporally variable recharge on subsurface reactive transport of contaminants at Oak Ridge Integrated Field Research Challenge site AN - 1686058921; 2015-045770 AB - Recharge is one of the most fundamental components of groundwater systems which drives both flow and transport in the subsurface and plays an important role in the migration of contaminants at the Oak Ridge Integrated Field Research Challenge (ORIFRC) site. The area receives an average of 137 cm of precipitation per year, most of it during winter. About 50% of the precipitation is lost to evapotranspiration, 40% runs off directly to surface water, and less than 10% recharges to ground water. The migration of the reactive contaminant plume at the site is modeled using the massively parallel flow and reactive transport model PFLOTRAN. The geology at the site consists of dipping beds of limestone, shale and sandstone with strike N 55 degrees E and dip 45 degrees SE, over which is superimposed a highly porous, horizontally oriented, saprolite weathering profile. To model this system in 3-D a grid was constructed with x-axis aligned with the strike of the geologic formation and z-axis vertical. This formulation requires a full permeability tensor with off-diagonal components obtained by rotation of the principal axes tensor through the formation dip angle. A full tensor capability was implemented in PFLOTRAN using the mimetic finite difference (MFD) method, a mass conserving, second-order accurate scheme with auxiliary pressure degrees of freedom at grid cell faces. A complex geochemical fluid with 17 primary reactive species and a number of minerals was implemented to model the contaminant discharged from the S-3 ponds at the ORIFRC site. A 50-year history of observed rainfall at the site was used as input to the model to estimate transient recharge conditions and to study the effect of spatially and temporally varied recharge. Results from the investigations of impact of spatio-temporal variation in recharge on the migration of contaminant plume will be presented. JF - American Geophysical Union Fall Meeting AU - Kumar, Jitendra AU - Lichtner, Peter C AU - Mills, R T AU - Hammond, G E AU - Svyatskiy, D AU - Tang, G AU - Brooks, S C AU - Watson, D B AU - Parker, J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H23C EP - 1281 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - hydrology KW - water quality KW - contaminant plumes KW - finite difference analysis KW - eastern Tennessee KW - pollution KW - ORIFC Site KW - fluid dynamics KW - evapotranspiration KW - ground water KW - spatial distribution KW - recharge KW - transport KW - geochemical methods KW - Tennessee KW - Oak Ridge Integrated Field Research Challenge Site KW - reactive transport KW - temporal distribution KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686058921?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Effect+of+spatially+and+temporally+variable+recharge+on+subsurface+reactive+transport+of+contaminants+at+Oak+Ridge+Integrated+Field+Research+Challenge+site&rft.au=Kumar%2C+Jitendra%3BLichtner%2C+Peter+C%3BMills%2C+R+T%3BHammond%2C+G+E%3BSvyatskiy%2C+D%3BTang%2C+G%3BBrooks%2C+S+C%3BWatson%2C+D+B%3BParker%2C+J%3BAnonymous&rft.aulast=Kumar&rft.aufirst=Jitendra&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - contaminant plumes; eastern Tennessee; evapotranspiration; finite difference analysis; fluid dynamics; geochemical methods; ground water; hydrology; Oak Ridge Integrated Field Research Challenge Site; ORIFC Site; pollution; reactive transport; recharge; spatial distribution; temporal distribution; Tennessee; transport; United States; water quality ER - TY - JOUR T1 - Coupled thermo-hydro-chemical (THC) modeling of hypogene karst evolution in a prototype mountain hydrologic system AN - 1686055603; 2015-045737 AB - Hypogene karst systems are believed to develop when water flowing upward against the geothermal gradient dissolves limestone as it cools. We present a comprehensive THC model incorporating time-evolving fluid flow, heat transfer, buoyancy effects, multi-component reactive transport and aperture/permeability change to investigate the origin of hypogene karst systems. Our model incorporates the temperature and pressure dependence of the solubility and dissolution kinetics of calcite. It also allows for rigorous representation of temperature-dependent fluid density and its influence on buoyancy forces at various stages of karstification. The model is applied to investigate karstification over geological time scales in a prototype mountain hydrologic system. In this system, a high water table maintained by mountain recharge, drives flow downward through the country rock and upward via a high-permeability fault/fracture. The pressure boundary conditions are maintained constant in time. The fluid flux through the fracture remains nearly constant even though the fracture aperture and permeability increase by dissolution, largely because the permeability of the country rock is not altered significantly due to slower dissolution rates. However, karstification by fracture dissolution is not impeded even though the fluid flux stays nearly constant. Forced and buoyant convection effects arise due to the increased permeability of the evolving fracture system. Since in reality the aperture varies significantly within the fracture plane, the initial fracture aperture is modeled as a heterogeneous random field. In such a heterogeneous aperture field, the water initially flows at a significant rate mainly through preferential flow paths connecting the relatively large aperture zones. Dissolution is more prominent at early time along these flow paths, and the aperture grows faster within these paths. With time, the aperture within small sub-regions of these preferential flow paths grows to a point where the permeability is large enough for the onset of buoyant convection. As a result, a multitude of buoyant convection cells form that take on a two-dimensional (2D) maze-like appearance, which could represent a 2D analog of the three-dimensional (3D) mazework pattern widely thought to be characteristic of hypogene cave systems. Although computational limitations limited us to 2D, we suggest that similar process interactions in a 3D network of fractures and faults could produce a 3D mazework. JF - American Geophysical Union Fall Meeting AU - Chaudhuri, A AU - Rajaram, H AU - Viswanathan, H S AU - Zyvoloski, G AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H21I EP - 07 PB - American Geophysical Union, Washington, DC VL - 2011 KW - hydrology KW - karst hydrology KW - fluid flow KW - coupling KW - hydrochemistry KW - buoyancy KW - hydrologic cycle KW - heat flow KW - heat transfer KW - thermochemical properties KW - geothermal gradient KW - permeability KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1686055603?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Coupled+thermo-hydro-chemical+%28THC%29+modeling+of+hypogene+karst+evolution+in+a+prototype+mountain+hydrologic+system&rft.au=Chaudhuri%2C+A%3BRajaram%2C+H%3BViswanathan%2C+H+S%3BZyvoloski%2C+G%3BAnonymous&rft.aulast=Chaudhuri&rft.aufirst=A&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-06-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - buoyancy; coupling; fluid flow; geothermal gradient; heat flow; heat transfer; hydrochemistry; hydrologic cycle; hydrology; karst hydrology; permeability; thermochemical properties ER - TY - JOUR T1 - Capturing the physics of dynamic earthquake triggering in a friction law AN - 1680753924; 2015-040275 AB - We develop a physical consitutive law for faulting with the goal of capturing the physics of dynamic earthquake triggering. Current constitutive models used to study seismic faulting, including the laboratory-based Dieterich-Ruina (DR) friction laws, do not capture the most basic observations of dynamic triggering. A transient perturbation applied to a population of faults governed by DR friction causes a decrease in the seismicity rate, while observations show dynamic strains cause an increase in the seismicity rate. We study various potential physical mechanisms and constitutive laws using simple spring slider models, and apply transient stress perturbations to investigate the dynamic response of the constitutive models. We quantitatively examine the resulting rate increase as a function of the perturbation amplitude, which can be tied to seismic observations of triggering. JF - American Geophysical Union Fall Meeting AU - Daub, E G AU - Guyer, R A AU - Johnson, P A AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S13A EP - 2267 PB - American Geophysical Union, Washington, DC VL - 2011 KW - transient methods KW - monitoring KW - seismicity KW - earthquake prediction KW - friction KW - constitutive equations KW - earthquakes KW - faults KW - observations KW - dynamic properties KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1680753924?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Capturing+the+physics+of+dynamic+earthquake+triggering+in+a+friction+law&rft.au=Daub%2C+E+G%3BGuyer%2C+R+A%3BJohnson%2C+P+A%3BAnonymous&rft.aulast=Daub&rft.aufirst=E&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2016-10-25 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - constitutive equations; dynamic properties; earthquake prediction; earthquakes; faults; friction; monitoring; observations; seismicity; transient methods ER - TY - JOUR T1 - Europa's ocean can be sustained by hydrothermal plumes and salt transport AN - 1676579071; 2015-036902 AB - Data returned by the Galileo spacecraft provide considerable evidence that Jupiter's satellite Europa possesses a liquid ocean beneath its solid, icy outer shell. However, it is not known if that ocean has existed throughout Europa's history. Previous thermal evolution models of Europa suggest that without active tidal dissipative heating (TDH), a global liquid ocean layer would eventually freeze long before the present. However, previous models have not coupled all the various thermal and flow processes that may be operating in Europa. Recently, we have developed a whole-moon numerical model for Europa. This model couples radiogenic heating, thermal diffusion, hydrothermal convection and salt transport in mantle pore water, hydrothermal flow and transport in an ocean layer, parameterized convection in the ice shell, and change of phase between ice and liquid water. Application of our model suggests that, even without TDH active until recently, hydrothermal convection in a salty, rocky mantle can sustain flow in an ocean layer throughout Europa's post-differentiation history. The model thermal history covers three phases: (i) an initial, roughly 0.5 Gyr-long period of radiogenic heating and differentiation, (ii) a long period from 0.5 Gyr to 4 Gyr with continuing radiogenic heating but no TDH (following Yoder, Nature 279: 767-770, 1979), and (iii) a final period covering the last 0.5 Gyr until present day, during which TDH is active. In our model, hydrothermal plumes develop throughout phases II and III, transporting heat and salt from Europa's silicate mantle to its ocean. The outer ice shell thickens over time, growing to about 75 km in depth. When TDH becomes active, the ice shell melts quickly to a thickness of about 10 km, and then stabilizes at roughly 20 to 25 km thickness, leaving an ocean 80 km deep. Parameterized convection in the ice shell is spatially non-uniform and changes over time, reflecting its ties to the evolving deeper ocean-mantle dynamics. A salt-free ocean/salty mantle pore water profile retards hydrothermal plume penetration into the ocean initially, but is homogenized over time, in roughly 50 Myrs, by turbulent diffusion in the ocean and time-dependent flow driven by initial thermal gradients. After homogenization, the uniformly distributed salt concentration is no longer a major factor in controlling plume transport, but does suppress the freezing point of the ocean layer. Salt transport leads to the formation of salt inclusions at the bottom of the ice shell. The presence of salt in the ice shell could strongly influence convection in that layer. JF - American Geophysical Union Fall Meeting AU - Travis, B J AU - Palguta, J AU - Schubert, G AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract P22B EP - 04 PB - American Geophysical Union, Washington, DC VL - 2011 KW - icy satellites KW - chemically precipitated rocks KW - numerical models KW - Europa Satellite KW - Galileo Program KW - Galilean satellites KW - convection KW - thermal history KW - evaporites KW - models KW - sedimentary rocks KW - satellites KW - salt KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1676579071?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Europa%27s+ocean+can+be+sustained+by+hydrothermal+plumes+and+salt+transport&rft.au=Travis%2C+B+J%3BPalguta%2C+J%3BSchubert%2C+G%3BAnonymous&rft.aulast=Travis&rft.aufirst=B&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-30 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - chemically precipitated rocks; convection; Europa Satellite; evaporites; Galilean satellites; Galileo Program; icy satellites; models; numerical models; salt; satellites; sedimentary rocks; thermal history ER - TY - JOUR T1 - Low-temperature stability of Mg-sulfate minerals in the presence of smectites; implications for tracing the water cycle of Mars AN - 1676578453; 2015-036915 AB - Hydrated Mg-sulfate minerals are common near the surface of Mars, where they may be found in association with other hydrated mineral phases such as smectites. The hydration states of Mg-sulfate minerals are strongly dependent on temperature and relative humidity (RH). Thus, detection of particular species of hydrated Mg-sulfate minerals (either remotely, using vibrational spectroscopy, or directly, using the X-ray diffraction capabilities of the upcoming Mars Science Laboratory mission) could potentially be used to understand the effects of RH, temperature, and exchange of H (sub 2) O between sulfate minerals and their local environment. Exchange of structural H (sub 2) O and cations occurs between Mg-sulfate minerals and Ca-rich smectites under conditions of varying RH similar to those at the arid surface of Mars. This exchange of Mg for Ca results in the production of a more Mg-rich smectite and precipitation of Ca-sulfate minerals such as gypsum (CaSO (sub 4) . 2H (sub 2) O) and bassanite (CaSO (sub 4) . approximately 0.5H (sub 2) O). Our experiments show that cation-exchange reactions can take place in the absence of free, liquid H (sub 2) O and are likely mediated by the presence of thin films of H (sub 2) O at smectite-sulfate grain boundaries. The ability of Mg-sulfate minerals and smectites to exchange H (sub 2) O suggests that these minerals may have the capacity to impact one another's hydration state. In order to improve our understanding of the probable behavior of Mg-sulfate minerals within multiphase geological materials, such as the Martian regolith and layered deposits of clays and sulfate salts, we have used humidity buffer experiments to assess the stability of hydrated Mg-sulfate minerals in the presence of smectites. A series of long-term microcosm experiments employed ranges of temperature conditions (-25 degrees C to +23 degrees C) and RH conditions (7 to 100%) that more closely emulate Martian surface conditions than have been used previously. Our results indicate that Mg-sulfate mineral equilibria, although still sluggish and path-dependent, are significantly affected by the presence of other RH-sensitive minerals (i.e., smectites). The formation of gypsum (even at -25 degrees C) indicates that Ca-sulfate minerals may be useful indicators of cation-exchange and mobility of H (sub 2) O at Mars-relevant temperatures. The presence of smectites suppresses deliquescence of Mg-sulfate minerals at higher temperatures and RH and appears to buffer humidity within mineral mixtures. In these mixtures hydrous Mg-sulfate minerals may occur beyond their expected T-RH equilibrium fields on timescales of months to a year. Our experiments also show that formation of meridianiite (MgSO (sub 4) . 11H (sub 2) O) from epsomite (MgSO (sub 4) . 7H (sub 2) O) does occur at sub-freezing temperatures, but this transformation may take upwards of 10 months even at very high RH. Together, these observations strongly suggest that the results of previous studies of mineral stability in the MgSO (sub 4) -H (sub 2) O system may be inadequate predictors of phase stability (and thus cycling and bioavailability of H (sub 2) O) within mineralogically complex Martian regolith. JF - American Geophysical Union Fall Meeting AU - Wilson, S A AU - Bish, D L AU - Vaniman, D T AU - Chipera, S AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract P23A EP - 1697 PB - American Geophysical Union, Washington, DC VL - 2011 KW - silicates KW - hydrology KW - magnesium sulfates KW - sulfates KW - smectite KW - Mars KW - temperature KW - clay minerals KW - terrestrial planets KW - planets KW - relative humidity KW - hydrologic cycle KW - gypsum KW - low temperature KW - sheet silicates KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1676578453?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Low-temperature+stability+of+Mg-sulfate+minerals+in+the+presence+of+smectites%3B+implications+for+tracing+the+water+cycle+of+Mars&rft.au=Wilson%2C+S+A%3BBish%2C+D+L%3BVaniman%2C+D+T%3BChipera%2C+S%3BAnonymous&rft.aulast=Wilson&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-30 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - clay minerals; gypsum; hydrologic cycle; hydrology; low temperature; magnesium sulfates; Mars; planets; relative humidity; sheet silicates; silicates; smectite; sulfates; temperature; terrestrial planets ER - TY - JOUR T1 - Recent developments about polarimetry as a tool to provide information about dust particles on asteroids, in cometary comae and in the zodiacal cloud AN - 1673366316; 2015-034782 AB - Solar system small bodies may be covered by dust layers forming a regolith, or build up of free-floating dust particles in cometary comae, cometary dust tails and the interplanetary dust (or zodiacal) cloud. While a few in-situ and sample-return missions have provided unique information, remote observations of the linear polarization of solar light scattered by dust still provide major clues to the bulk properties of the dust particles. The polarization is a dimensionless ratio that does not depend upon the changing distances to the Sun and to the observer of the scattering object. Polarimetric phase curves in the visible and near infrared domains are smooth and typical of irregular scattering particles. Variation of the polarimetric properties with the wavelength of the observations presents mostly a linear dependence in the visible. Observations have already provided classifications of asteroids and cometary comae through dust polarimetric behaviour. Recent results about targets of on-going space missions to, e.g., asteroid (21) Lutetia and comets 103P/Hartley 2 or 67P/Churyumov-Gerasimenko will be discussed [Hadamcik et al. JQSRT 112, 1881, 2011; Hadamcik et al. A&A 517, A86, 2010]. Interpretation, in terms of physical properties, of the polarization data, stems from experimental and numerical simulations [Levasseur-Regourd et al. ASR 20, 1585, 1997]. Measurements on clouds of analogue particles in jet streams and in vials (under, e.g., microgravity conditions) and numerical simulations with clouds of irregular grains and porous aggregates of grains, have been developed. Comparison with cometary comae observations suggests that cometary dust particles are built of fluffy aggregates and of compact grains, with significant proportions of both rather transparent astronomical silicates and absorbing carbonaceous compounds [Hadamcik et al. JQSRT 100, 143, 2006; Lasue et al. JQSRT 100, 220, 2006]. As far as the interplanetary dust cloud is concerned, it is suggested that at least half of the interplanetary dust, between 0.7 and 1.5 AU from the Sun near the ecliptic, consists of fluffy absorbing carbonaceous material of cometary origin, which progressively evaporates as the dust particles spiral towards the Sun under Poynting-Robertson effect [Levasseur-Regourd et al., PSS 55 1010, 2007; Lasue et al., A&A 473, 641, 2007]. The significance of such studies to better understand the formation and evolution of small solar system bodies will be addressed. JF - American Geophysical Union Fall Meeting AU - Levasseur-Regourd, A AU - Lasue, J AU - Hadamcik, Edith AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract P14C EP - 06 PB - American Geophysical Union, Washington, DC VL - 2011 KW - near-infrared spectra KW - laboratory studies KW - experimental studies KW - cosmic dust KW - comets KW - numerical models KW - asteroids KW - optical spectra KW - polarimetry KW - spectra KW - interplanetary dust KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1673366316?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Recent+developments+about+polarimetry+as+a+tool+to+provide+information+about+dust+particles+on+asteroids%2C+in+cometary+comae+and+in+the+zodiacal+cloud&rft.au=Levasseur-Regourd%2C+A%3BLasue%2C+J%3BHadamcik%2C+Edith%3BAnonymous&rft.aulast=Levasseur-Regourd&rft.aufirst=A&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/P/sessions/P14C/abstracts/P14C-06.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - SuppNotes - Accessed on Oct. 30, 2014 N1 - Last updated - 2015-04-16 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - asteroids; comets; cosmic dust; experimental studies; interplanetary dust; laboratory studies; near-infrared spectra; numerical models; optical spectra; polarimetry; spectra ER - TY - JOUR T1 - Multi-layer, sharp-interface models of pore pressure buildup within the Illinois Basin due to basin-wide CO2 injection AN - 1668232512; 2015-030442 AB - We recently developed and applied a new parallel, multi-layer, finite-element model to the Illinois Basin in order to assess the spatial extent and magnitude of pore pressure increases resulting from the annual projected injection of 100 million metric tons of CO2. One focus of this work is to assess the potential for inducing a seismic event associated with low effective stress conditions around CO2 injection wells in the southern Illinois Basin where Mt Simon permeability is relatively low (< 50 mD). We used a sharp-interface formulation to represent a CO2, freshwater, and brine transport within each layer. A simple parallelization scheme was used in which fluid transport in each layer is solved on a separate processor. The layers are linked at the after each time step through vertical fluxes of fresh and saline water across their respective confining units. This model was validated, in part, by comparison to computed pore pressure distributions from a published 8-layer test case. Our Illinois Basin model represents spatial variations in porosity using a modified form of Athy's law. Permeability is logarithmically related to porosity so that permeability. Principal reservoirs represented in our model include the Mt. Simon Formation, the Knox Dolomite, Ordovician carbonates, Silurian-Devonian and Mississippian-Pennsylvanian sandstone/carbonates units. Key confining unit represented include the Eau Claire, Maquoketa, and New Albany Shales. A limited number of low-permeability faults were also included in the model. The permeability of fault elements were set to between 10-100 times lower than surrounding sediments. We calibrated our model using historical freshwater pumping data from the Chicago area (128 million gallons per day of H2O) as well as the salinity distribution across the Illinois Basin. We found that incorporating a stream network which included the Rock River near Chicago was important in reproducing pre-development head patterns in the Cambro-Ordovician aquifer system. This suggests that aquitards in this area are not perfectly confining. We were able to match the spatial extent (about 150 km) and maximum drawdown (270 m) around Chicago using our basin-scale model. We plan to simulate the injection of CO2 into the Mt Simon Formation in the central Illinois Basin and the Knox Dolomite in the southern Illinois Basin in Kentucky. JF - American Geophysical Union Fall Meeting AU - Zhang, Y AU - Person, M A AU - Kerra, S AU - Celia, M A AU - Nordbotten, J M AU - Bandilla, K AU - Elliot, T R AU - Rupp, J AU - Ellett, K M AU - Bowen, B B AU - Pickett, W AU - Woolsey, E E AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H33B EP - 1315 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - data processing KW - global change KW - Mount Simon Sandstone KW - Cambrian KW - reservoir rocks KW - carbon dioxide KW - Upper Cambrian KW - waste management KW - transport KW - hydrology KW - Illinois Basin KW - carbon sequestration KW - numerical models KW - Paleozoic KW - stress KW - injection KW - pollution KW - fluid flow KW - aquitards KW - models KW - computer programs KW - greenhouse gases KW - permeability KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668232512?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Multi-layer%2C+sharp-interface+models+of+pore+pressure+buildup+within+the+Illinois+Basin+due+to+basin-wide+CO2+injection&rft.au=Zhang%2C+Y%3BPerson%2C+M+A%3BKerra%2C+S%3BCelia%2C+M+A%3BNordbotten%2C+J+M%3BBandilla%2C+K%3BElliot%2C+T+R%3BRupp%2C+J%3BEllett%2C+K+M%3BBowen%2C+B+B%3BPickett%2C+W%3BWoolsey%2C+E+E%3BAnonymous&rft.aulast=Zhang&rft.aufirst=Y&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H33B/abstracts/H33B-1315.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquitards; Cambrian; carbon dioxide; carbon sequestration; computer programs; data processing; fluid flow; global change; greenhouse gases; hydrology; Illinois Basin; injection; models; Mount Simon Sandstone; numerical models; Paleozoic; permeability; pollution; reservoir rocks; stress; transport; United States; Upper Cambrian; waste management ER - TY - JOUR T1 - Automated meshing of stochastically generated discrete fracture networks AN - 1668231350; 2015-030495 AB - Discrete Fracture Networks (DFN) models are important alternatives to continuum approximations to fluid flow and transport in fractured rock. Generation of high-quality meshes on stochastically generated DFNs is challenging because the resulting geometric features (fractures, fracture intersections, spaces between fracture intersections, etc.) that must be resolved typically span a wide range of spatial scales. Previous approaches to generating meshes on DFNs often deformed the DFN to align its features with a mesh through various techniques including redefining lines of intersection as stair step functions and distorting the edges of the fractures. Instead of distorting a stochastically generated DFN, we constrain the stochastic generation of the DFN to ensure that a high quality conforming Delaunay triangulation of reasonable size can be generated. The method is based on rejection; any stochastically generated fracture that would cause a measurable feature whose length is less than a specified minimum length scale is rejected. Details of this novel approach will be provided and statistics of the resulting meshes analyzed. Numerical examples of control volume flow solutions on the resulting grids will also be presented. JF - American Geophysical Union Fall Meeting AU - Hyman, J D AU - Gable, C W AU - Painter, S AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H33G EP - 1403 PB - American Geophysical Union, Washington, DC VL - 2011 KW - models KW - hydrology KW - fractures KW - numerical models KW - transport KW - stochastic processes KW - spatial data KW - fluid flow KW - Discrete Fracture Networks models KW - ground water KW - geometry KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668231350?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Automated+meshing+of+stochastically+generated+discrete+fracture+networks&rft.au=Hyman%2C+J+D%3BGable%2C+C+W%3BPainter%2C+S%3BAnonymous&rft.aulast=Hyman&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H33G/abstracts/H33G-1403.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Discrete Fracture Networks models; fluid flow; fractures; geometry; ground water; hydrology; models; numerical models; spatial data; stochastic processes; transport ER - TY - JOUR T1 - Assessing uncertainty in subsurface transport predictions using the ASCEM toolset AN - 1664436673; 2015-024836 AB - Transport simulation of nonreactive solutes can be used to identify potential pathways of contaminants in the vadose zone and the effectiveness of site remediation technologies. At the BC Cribs site at Hanford in southeastern Washington State, innovative remedial technologies are being explored to address recalcitrant contamination in the deep ( nearly equal 100 m) vadose zone. To identify the effectiveness of the technologies, the impacts of a "no-action" alternative must also be explored. Because only sparse information is available for the geologic conceptual model and the physical and chemical properties of the sediments, there is considerable uncertainty in subsurface transport predictions. In this contribution, the uncertainty of the technetium-99 mass flux to the water table due to parameter uncertainty and variations in the conceptual model are investigated using a newly developed toolset for performing an uncertainty quantification (UQ) analysis. This toolset is part of ASCEM (Advanced Simulation Capability for Environmental Management), a state-of-the-art scientific tool and approach for understanding and predicting contaminant fate and transport in natural and engineered systems. Using the Akuna user environment currently under development, the uncertainty in technetium-99 transport through a two-dimensional, heterogeneous vadose-zone system is quantified with Monte Carlo simulation. Results show that uncertainty in simulated mass fluxes in hydraulic properties can be significant within a single conceptual model, and that significant additional uncertainty can be introduced by conceptual model variation. JF - American Geophysical Union Fall Meeting AU - Freedman, V AU - Chen, X AU - Keating, E H AU - Higdon, D M AU - Rockhold, M L AU - Schuchardt, K L AU - Finsterle, S AU - Gorton, I AU - Freshley, M AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H24A EP - 01 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - solute transport KW - advanced simulation capability for Environmental Management KW - isotopes KW - data processing KW - unsaturated zone KW - ASCEM program KW - simulation KW - remediation KW - ground water KW - radioactive isotopes KW - transport KW - technetium KW - Washington KW - Monte Carlo analysis KW - statistical analysis KW - prediction KW - pollution KW - optimization KW - Hanford Site KW - Tc-99 KW - two-dimensional models KW - aquifers KW - computer programs KW - water table KW - metals KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664436673?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Assessing+uncertainty+in+subsurface+transport+predictions+using+the+ASCEM+toolset&rft.au=Freedman%2C+V%3BChen%2C+X%3BKeating%2C+E+H%3BHigdon%2C+D+M%3BRockhold%2C+M+L%3BSchuchardt%2C+K+L%3BFinsterle%2C+S%3BGorton%2C+I%3BFreshley%2C+M%3BAnonymous&rft.aulast=Freedman&rft.aufirst=V&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H24A/abstracts/H24A-01.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-16 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - advanced simulation capability for Environmental Management; aquifers; ASCEM program; computer programs; data processing; ground water; Hanford Site; isotopes; metals; Monte Carlo analysis; optimization; pollution; prediction; radioactive isotopes; remediation; simulation; solute transport; statistical analysis; Tc-99; technetium; transport; two-dimensional models; United States; unsaturated zone; Washington; water table ER - TY - JOUR T1 - Flow and radionuclide transport models of the unsaturated zone at the Nevada National Security Site; examples from Yucca Flat and Rainier Mesa AN - 1660633303; 2015-017903 AB - The former Nevada Test Site (now the Nevada National Security Site) hosted 828 underground nuclear explosions between 1951 and 1992, leaving an estimated 1.3e+08 curies of tritium, fission products, activation products and unspent fuel in the subsurface when the nuclear test moratorium was adopted in September, 1992. In two former testing areas of the Nevada National Security Site - Yucca Flat and Rainier Mesa- a significant fraction of the initial radionuclide inventory was introduced from nuclear tests with working points in the unsaturated zone. In Yucca Flat, an arid, low-elevation alluvium-filled basin where most tests were conducted in vertical shafts, unsaturated flow and transport models indicate that radionuclide migration to the water table is most likely where overlying subsidence craters receive significant infiltration from overland flow during infrequent runoff events. These craters tend to be located along the perimeter of the basin and have large contributing watersheds in the surrounding hills. At Rainier Mesa, a wetter, high-elevation remnant of a once more extensive volcanic plateau, most tests were conducted at the ends of horizontal drifts in the vicinity of local perched water zones. Unsaturated flow and transport models of one of the larger tunnel complexes (N-tunnel) indicate that despite relatively high infiltration rates on the mesa, radionuclide diffusion from the flowing fractures to the porous matrix may significantly attenuate radionuclide movement to the water table, depending on the assumed fracture attributes. Simulations show that the tunnel itself may be an important hydraulic feature that connects radionuclide sources to sub-vertical faults that are assumed to extend to the water table. JF - American Geophysical Union Fall Meeting AU - Kwicklis, E M AU - Viswanathan, H S AU - Levitt, D G AU - Dash, Z AU - Gable, C W AU - Lu, Z AU - Dai, Z AU - Zyvoloski, G AU - Miller, T A AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H53A EP - 1384 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - isotopes KW - unsaturated zone KW - tritium KW - fluid dynamics KW - simulation KW - ground water KW - Nevada Test Site KW - Nevada National Security Site KW - radioactive isotopes KW - transport KW - Rainier Mesa KW - sediments KW - Yucca Flat KW - nuclear explosions KW - fission KW - Nevada KW - explosions KW - clastic sediments KW - underground explosions KW - pollution KW - Nye County Nevada KW - models KW - water table KW - infiltration KW - hydrogen KW - runoff KW - alluvium KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660633303?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Flow+and+radionuclide+transport+models+of+the+unsaturated+zone+at+the+Nevada+National+Security+Site%3B+examples+from+Yucca+Flat+and+Rainier+Mesa&rft.au=Kwicklis%2C+E+M%3BViswanathan%2C+H+S%3BLevitt%2C+D+G%3BDash%2C+Z%3BGable%2C+C+W%3BLu%2C+Z%3BDai%2C+Z%3BZyvoloski%2C+G%3BMiller%2C+T+A%3BAnonymous&rft.aulast=Kwicklis&rft.aufirst=E&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H53A/abstracts/H53A-1384 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - alluvium; clastic sediments; explosions; fission; fluid dynamics; ground water; hydrogen; infiltration; isotopes; models; Nevada; Nevada National Security Site; Nevada Test Site; nuclear explosions; Nye County Nevada; pollution; radioactive isotopes; Rainier Mesa; runoff; sediments; simulation; transport; tritium; underground explosions; United States; unsaturated zone; water table; Yucca Flat ER - TY - JOUR T1 - 3D numerical models of co-eruptive volcanic vent evolution and influence on eruptive dynamics AN - 1660632282; 2015-017989 AB - Eruptive conduits feeding volcanic jets and plumes are connected to the atmosphere through volcanic vents that, depending on their size and 3D shape, can alter the dynamics and structure of these eruptions. The host rock comprising the vent, in turn, can collapse, fracture, and erode in response to the eruptive flow field. Here we present results from fully coupled numerical simulations of high speed, multiphase volcanic mixtures erupting through erodible, visco-plastic host rocks. This work explores the influence of different host rock rheologies, computational approximations, and eruptive conditions on the development of simulated volcanic jets. JF - American Geophysical Union Fall Meeting AU - Ogden, D E AU - Wohletz, K H AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract V33A EP - 2607 PB - American Geophysical Union, Washington, DC VL - 2011 KW - numerical models KW - three-dimensional models KW - rheology KW - eruptions KW - host rocks KW - volcanoes KW - simulation KW - vents KW - explosive eruptions KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632282?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=3D+numerical+models+of+co-eruptive+volcanic+vent+evolution+and+influence+on+eruptive+dynamics&rft.au=Ogden%2C+D+E%3BWohletz%2C+K+H%3BAnonymous&rft.aulast=Ogden&rft.aufirst=D&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/V/sessions/V33A/abstracts/V33A-2607.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - eruptions; explosive eruptions; host rocks; numerical models; rheology; simulation; three-dimensional models; vents; volcanoes ER - TY - JOUR T1 - Transport of intrinsic plutonium colloids in saturated porous media AN - 1660632130; 2015-017935 AB - Actinide contaminants were introduced to the subsurface environment as a result of nuclear weapons development and testing, as well as for nuclear power generation and related research activities for defense and civilian applications. Even though most actinide species were believed to be fairly immobile once in the subsurface, recent studies have shown the transport of actinides kilometers away from their disposal sites. For example, the treated liquid wastes released into Mortandad Canyon at the Los Alamos National Laboratory were predicted to travel less than a few meters; however, plutonium and americium have been detected 3.4 km away from the waste outfall. A colloid-facilitated mechanism has been suggested to account for this unexpected transport of these radioactive wastes. Clays, oxides, organic matters, and actinide hydroxides have all been proposed as the possible mobile phase. Pu ions associated with natural colloids are often referred to as pseudo-Pu colloids, in contrast with the intrinsic Pu colloids that consist of Pu oxides. Significant efforts have been made to investigate the role of pseudo-Pu colloids, while few studies have evaluated the environmental behavior of the intrinsic Pu colloids. Given the fact that Pu (IV) has extremely low solubility product constant, it can be inferred that the transport of Pu in the intrinsic form is highly likely at suitable environmental conditions. This study investigates the transport of intrinsic Pu colloids in a saturated alluvium material packed in a cylindrical column (2.5-cm Dia. x 30-cm high) and compares the results to previous data on the transport of pseudo Pu colloids in the same material. A procedure to prepare a stable intrinsic Pu colloid suspension that produced consistent and reproducible electrokinetic and stability data was developed. Electrokinetic properties and aggregation stability were characterized. The Pu colloids, together with trillium as a conservative tracer, were injected into the column at a flow rate of nearly equal 6 mL/hr. Despite that the Pu intrinsic colloids are positively charged while the alluvium grain surfaces are negatively charged under the current experimental conditions, about 30% of the Pu colloids population transported through the column and broke through earlier than trillium. Our previous experiments in the same column have shown a highly unretarded transport of the negatively charged pseudo Pu colloids (Pu sorbed onto smectite colloids) and complete retardation of the dissolved Pu. The enhanced transport of Pu colloids was explained by the effective pore volume concept. Combining the results of these two experiments, it is concluded that the intrinsic Pu colloids transported in the column by adsorbing onto the background clay colloids due to electrostatic repulsion. JF - American Geophysical Union Fall Meeting AU - Zhou, D AU - Abdel-Fattah, A AU - Boukhalfa, H AU - Ware, S AU - Tarimala, S AU - Keller, A A AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H53B EP - 1420 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - clay KW - aquifer vulnerability KW - water quality KW - plutonium KW - Mortandad Canyon KW - suspended materials KW - New Mexico KW - Los Alamos County New Mexico KW - radioactive waste KW - ground water KW - transport KW - tracers KW - sediments KW - colloidal materials KW - clastic sediments KW - pollution KW - porous materials KW - migration of elements KW - adsorption KW - Los Alamos National Laboratory KW - aquifers KW - metals KW - alluvium KW - waste disposal KW - actinides KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632130?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Transport+of+intrinsic+plutonium+colloids+in+saturated+porous+media&rft.au=Zhou%2C+D%3BAbdel-Fattah%2C+A%3BBoukhalfa%2C+H%3BWare%2C+S%3BTarimala%2C+S%3BKeller%2C+A+A%3BAnonymous&rft.aulast=Zhou&rft.aufirst=D&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H53B/abstracts/H53B-1420.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - actinides; adsorption; alluvium; aquifer vulnerability; aquifers; clastic sediments; clay; colloidal materials; ground water; Los Alamos County New Mexico; Los Alamos National Laboratory; metals; migration of elements; Mortandad Canyon; New Mexico; plutonium; pollution; porous materials; radioactive waste; sediments; suspended materials; tracers; transport; United States; waste disposal; water quality ER - TY - JOUR T1 - Evidence for past melting at the base of the GISP2 ice core from uranium-thorium disequilibrium measurements AN - 1648908375; 2015-008553 AB - We measured (super 238) U- (super 234) U- (super 230) Th disequilibria by mass spectrometric methods for silty ice samples from the base of the GISP2 Greenland ice core, at a depth of 3040-3052 m. The expected age of these samples is >150 kyr based on counting ice layers. We separated the samples into several fractions by filtration and analyzed the 200 nm (particulate) filtered fractions. In the 150 kyr. Since liquid water is characterized by (super 230) Th/ (super 234) U activity ratios 200 nm) fraction is characterized by Th/U ratios of approximately 4.4-4.9, (super 234) U/ (super 238) U activity ratios of 1.049-1.056, and (super 230) Th/ (super 234) U activity ratios of 1.12-1.23. The U-Th disequilibrium in the particles is consistent with recent (<350 kyr) fractionation of U-Th in these ice samples. We have modeled these results using a two component mass balance calculation, with dissolved and particulate pools for each radionuclide. The main assumption is that all of the (super 232) Th in the <50 nm fraction is due to particles, due to the low aqueous solubility of (super 232) Th. By mass balance, (super 230) Th/ (super 234) U activity ratios for the truly dissolved fraction are 0.031-0.062, and dates for when the samples were last frozen are 3.5-6.9 kyr. These results are consistent with the notion of ice melting at the base of large continental ice sheets, with recent evidence of large sub-glacial lakes in Antarctica and active melting at the base of the nearby N-GRIP Greenland ice core. There also appears to be a significant difference in age for the deepest ice sample (3.5 kyr; 3052 m) and the other samples (5.2-6.9 kyr; 3040-3048 m), suggesting that the deepest part of the ice core adjacent to bedrock at 3053.3 m depth may have existed as liquid water for at least several hundred-few thousand years. JF - American Geophysical Union Fall Meeting AU - Goldstein, S J AU - Lee, V E AU - Nishiizumi, K AU - Murrell, M T AU - Amato, R S AU - Nunn, A J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract V11D EP - 2540 PB - American Geophysical Union, Washington, DC VL - 2011 KW - isotopes KW - lakes KW - mass spectra KW - GISP2 KW - freezing KW - Th/U KW - climate change KW - U-234/Th-230 KW - Cenozoic KW - Greenland KW - radioactive isotopes KW - melting KW - dates KW - ice KW - sediments KW - absolute age KW - NGRIP KW - spectra KW - subglacial lakes KW - ice cores KW - Quaternary KW - clastic sediments KW - isotope ratios KW - Arctic region KW - silt KW - ice sheets KW - Antarctica KW - metals KW - thorium KW - uranium KW - U-238/U-234 KW - glacial geology KW - actinides KW - particles KW - 24:Quaternary geology KW - 03:Geochronology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1648908375?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Evidence+for+past+melting+at+the+base+of+the+GISP2+ice+core+from+uranium-thorium+disequilibrium+measurements&rft.au=Goldstein%2C+S+J%3BLee%2C+V+E%3BNishiizumi%2C+K%3BMurrell%2C+M+T%3BAmato%2C+R+S%3BNunn%2C+A+J%3BAnonymous&rft.aulast=Goldstein&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/V/sessions/V11D/abstracts/V11D-2540.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2015-01-29 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - absolute age; actinides; Antarctica; Arctic region; Cenozoic; clastic sediments; climate change; dates; freezing; GISP2; glacial geology; Greenland; ice; ice cores; ice sheets; isotope ratios; isotopes; lakes; mass spectra; melting; metals; NGRIP; particles; Quaternary; radioactive isotopes; sediments; silt; spectra; subglacial lakes; Th/U; thorium; U-234/Th-230; U-238/U-234; uranium ER - TY - JOUR T1 - Efficient computational strategies for modeling radionuclide transport in large-scale applications AN - 1645575680; 2015-005238 AB - Performance assessments of high- and low-level radioactive waste disposal systems and risk assessments of radiologically contaminated sites require large-scale modeling of radionuclide migration. Transport modeling in these applications is computationally challenging because of the need to address large spatial scales, long time frames, parametric uncertainties, multiple radionuclides coupled through decay chains, geologic heterogeneity across a wide range of spatial scales, and various radionuclide retention processes. Because of these computational demands, performance assessment studies typically use approximations such as simplified representation of transport pathways, representative waste packages instead full variability of radionuclide sources, and abstracted representations of retention processes. Several variants of particle tracking methods have recently been developed specifically for use in performance assessment (PA) studies. These new PA-oriented modeling strategies are particularly efficient and robust in applications that explicitly address parametric uncertainty and make it possible to avoid many of the previous simplifications. Particle tracking in the time domain, post-processing of particle tracking results to address uncertainties, particle tracking on unstructured grids, and new combinations of these concepts will be reviewed and critically assessed. Geosphere transport results for the proposed Forsmark repository for spent nuclear fuel in Sweden will be presented as an example application. JF - American Geophysical Union Fall Meeting AU - Painter, S AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H53I EP - 1524 PB - American Geophysical Union, Washington, DC VL - 2011 KW - isotopes KW - data processing KW - radioactive decay KW - Europe KW - radioactive waste KW - ground water KW - radioactive isotopes KW - transport KW - retention KW - geosphere KW - uncertainty KW - Western Europe KW - underground storage KW - migration of elements KW - models KW - computer programs KW - Scandinavia KW - underground installations KW - risk assessment KW - waste disposal KW - low-level waste KW - Forsmark Site KW - underground disposal KW - Sweden KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645575680?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Efficient+computational+strategies+for+modeling+radionuclide+transport+in+large-scale+applications&rft.au=Painter%2C+S%3BAnonymous&rft.aulast=Painter&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H53I/abstracts/H53I-1524.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-16 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - computer programs; data processing; Europe; Forsmark Site; geosphere; ground water; isotopes; low-level waste; migration of elements; models; radioactive decay; radioactive isotopes; radioactive waste; retention; risk assessment; Scandinavia; Sweden; transport; uncertainty; underground disposal; underground installations; underground storage; waste disposal; Western Europe ER - TY - JOUR T1 - Amanzi and Akuna; two new community codes for subsurface contaminant flow and transport AN - 1645575589; 2015-005267 AB - The Advanced Simulation Capability for Environmental Management (ASCEM) program is developing a modular and extensible open-source set of tools for understanding the fate and transport of contaminants in natural and engineered systems. These tools not only support a fundamental shift toward standardized assessments of performance and risk for the Department of Energy Office of Environmental Management (DOE-EM) cleanup and closure decisions, but establish a modern high-quality code base for a growing interdisciplinary community. Specifically, ASCEM is leveraging advances and expertise from applied mathematics, computer and computational sciences, and the geosciences, in this new development. A toolset named Akuna will provide capabilities for data management, visualization, conceptual model development, uncertainty quantification, parameter estimation, risk analysis, and decision support. Akuna will integrate with Amanzi, a flexible high performance computing simulator, which is designed to leverage the growing parallelism in modern systems. This talk will describe the approach that we have taken to develop this new open-source capability, including issues of intellectual property, licensing, the developers tool chain, and the users tool chain. The modular and extensible design will be discussed, highlighting the potential for collaboration and inclusion of recent modeling and algorithmic advances. In addition, it will discuss the advantages and challenges of relying on an open-source model that leverages a wide variety of open-source efforts from other programs. Results from early prototype development will be presented to highlight the potential of these new tools to contaminated subsurface environments, including calculations for variably saturated flow, advection of non-reactive species and the reactive-transport of 17 different chemical species on both structured and unstructured meshes. JF - American Geophysical Union Fall Meeting AU - Dixon, P R AU - Moulton, J D AU - Gorton, I AU - Meza, J AU - Freshley, M AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H53L EP - 05 PB - American Geophysical Union, Washington, DC VL - 2011 KW - hydrology KW - advanced simulation capability for Environmental Management KW - data processing KW - pollution KW - mathematical models KW - ASCEM program KW - simulation KW - remediation KW - models KW - environmental management KW - computer programs KW - visualization KW - transport KW - quantitative analysis KW - theoretical models KW - reactive transport KW - risk assessment KW - Akuna KW - Amanzi KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645575589?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Amanzi+and+Akuna%3B+two+new+community+codes+for+subsurface+contaminant+flow+and+transport&rft.au=Dixon%2C+P+R%3BMoulton%2C+J+D%3BGorton%2C+I%3BMeza%2C+J%3BFreshley%2C+M%3BAnonymous&rft.aulast=Dixon&rft.aufirst=P&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H53L/abstracts/H53L-05.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-16 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - advanced simulation capability for Environmental Management; Akuna; Amanzi; ASCEM program; computer programs; data processing; environmental management; hydrology; mathematical models; models; pollution; quantitative analysis; reactive transport; remediation; risk assessment; simulation; theoretical models; transport; visualization ER - TY - JOUR T1 - The anisotropic, elastic-decohesive constitutive law in CICE; implementation and results AN - 1645571410; 2015-003120 AB - In today's sea ice models, the internal stress, mechanical properties and deformation of the ice pack are typically represented using an isotropic, viscous-plastic-type rheology. In this approach, the ice is in a continual state of plastic flow except when strain rates approach zero as the ice pack becomes rigid. In the latter case, a viscous "creep" behavior is imposed to regularize singularities in the standard viscous-plastic approach; elastic waves regularize the singularities in the elastic-viscous-plastic variant of the model. In contrast, large-scale sea ice observations indicate that the ice moves as large, rigid plates with high shear values along long, narrow fractures between the plates. These fractures often represent open water areas within the ice pack, where ocean-atmosphere fluxes of heat and water predominate. To better represent the dynamics of these important features within the ice pack, we have implemented an anisotropic, fracture-mechanics based constitutive law, the elastic-decohesive rheology, into the Los Alamos Sea Ice Model, CICE. We compare results from this model with the original elastic-viscous-plastic rheology in CICE, with the original elastic-decohesive "MPM" sea ice model (solved with the Material Point Method using Lagrangian particles), and with observed data from the RADARSAT Geophysical Processor System. JF - American Geophysical Union Fall Meeting AU - Hunke, E C AU - Peterson, K J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract C33G EP - 02 PB - American Geophysical Union, Washington, DC VL - 2011 KW - hydrology KW - cryosphere KW - Los Alamos Sea Ice Model KW - heat flux KW - isotropic materials KW - sea ice KW - CICE KW - stress KW - mechanical properties KW - air-sea interface KW - fluid dynamics KW - deformation KW - hydrosphere KW - models KW - viscosity KW - dynamics KW - rheology KW - ice KW - plasticity KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645571410?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+anisotropic%2C+elastic-decohesive+constitutive+law+in+CICE%3B+implementation+and+results&rft.au=Hunke%2C+E+C%3BPeterson%2C+K+J%3BAnonymous&rft.aulast=Hunke&rft.aufirst=E&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/C/sessions/C33G/abstracts/C33G-02.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - air-sea interface; CICE; cryosphere; deformation; dynamics; fluid dynamics; heat flux; hydrology; hydrosphere; ice; isotropic materials; Los Alamos Sea Ice Model; mechanical properties; models; plasticity; rheology; sea ice; stress; viscosity ER - TY - JOUR T1 - Extracting laterally varying attenuation from microseisms AN - 1641012204; 2015-001790 AB - Noise cross-correlation (NCC) has been successfully used in constructing empirical Green's functions (EGFs) for seismic velocity tomography. However, extracting reliable EGF amplitudes for attenuation estimation remains a challenge despite the fact that there are studies that derive spatially averaged attenuation from noise. In this work we use microseisms recorded by the USArray stations to explore the techniques that may accomplish the task to accurately measure EGF amplitudes and thus provide reliable input to the tomographic mapping of the laterally varying attenuation. Traditional NCC processing often trades amplitude information for phases with a better signal-to-noise ratio (SNR). An equally efficient method, temporal flattening, which removes the dominance of high-level noise in particular time intervals, and yet keeps the relative amplitudes among stations, is to normalize the narrow-band signals at each station by an average of the noise energy level at all stations. In addition to the effect of traditional NCC processing, EGF amplitude can also be biased by the uneven distribution of noise-field intensity in space, time and direction. To mitigate the effect of anisotropic noise field, we calculate EGFs using beam cross-correlation (BCC). Namely we construct beams according to the strike of a station pair and the surface-wave velocity, so that the beam signal contains mainly the energy flux along the strike. We validate our methods by comparing the surface-wave amplitudes from an earthquake with relative EGF amplitudes from a "source" station near the earthquake. JF - American Geophysical Union Fall Meeting AU - Zhang, J AU - Yang, X AU - Weaver, R L AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S21B EP - 2190 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - tomography KW - attenuation KW - seismicity KW - microseisms KW - Green function KW - tectonics KW - earthquakes KW - seismotectonics KW - noise KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641012204?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Extracting+laterally+varying+attenuation+from+microseisms&rft.au=Zhang%2C+J%3BYang%2C+X%3BWeaver%2C+R+L%3BAnonymous&rft.aulast=Zhang&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/S/sessions/S21B/abstracts/S21B-2190 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-31 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - attenuation; earthquakes; Green function; microseisms; noise; seismicity; seismotectonics; tectonics; tomography; United States ER - TY - JOUR T1 - Combined use of computed tomography and the lattice-Boltzmann method to investigate the influence of pore geometry of porous media on the permeability tensor AN - 1637539534; 2014-103409 AB - The objective of this work was to investigate the impact of pore geometry of porous media on the permeability tensor. High-resolution, three-dimensional maps of natural sand systems, comprising a range of grain sizes and shapes were obtained using Synchrotron microtomography. The lattice-Boltzmann (LB) method was used to simulate saturated flow through these packs to characterize the impact of particle shape on the permeability tensor. LB computations of permeability tensor and their dependency on the internal structure of porous media will be presented and discussed. JF - American Geophysical Union Fall Meeting AU - Striblet, J C AU - Rush, L AU - Floyd, M AU - Porter, M L AU - Al-Raoush, R I AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H51E EP - 1240 PB - American Geophysical Union, Washington, DC VL - 2011 KW - tomography KW - hydrology KW - lattice KW - three-dimensional models KW - grain size KW - unsaturated zone KW - mapping KW - fluid dynamics KW - simulation KW - porosity KW - ground water KW - computed tomography KW - testing KW - pore water KW - permeability KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637539534?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Combined+use+of+computed+tomography+and+the+lattice-Boltzmann+method+to+investigate+the+influence+of+pore+geometry+of+porous+media+on+the+permeability+tensor&rft.au=Striblet%2C+J+C%3BRush%2C+L%3BFloyd%2C+M%3BPorter%2C+M+L%3BAl-Raoush%2C+R+I%3BAnonymous&rft.aulast=Striblet&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H51E/abstracts/H51E-1240.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - computed tomography; fluid dynamics; grain size; ground water; hydrology; lattice; mapping; permeability; pore water; porosity; simulation; testing; three-dimensional models; tomography; unsaturated zone ER - TY - JOUR T1 - Distributions of residual fluid in non-wetting invasions in porous media AN - 1637536534; 2014-103412 AB - Pore-scale interfacial processes, specifically of dissolution of CO2 into brine, are one of several key controlling factors for successful geologic sequestration of CO2. To evaluate the interfacial processes, we consider experimentally, pattern formation and statistics of fluid spatial distributions created during the displacement of a wetting fluid by a non-wetting fluid in a two-dimensional pore network micromodel. A micromodel is initially saturated with a wetting fluid and is subsequently invaded with an immiscible, non-wetting fluid at a constant volumetric flow rate until the pattern of residual fluid has reached a steady state. We consider displacements with capillary numbers in the range 10-6 to 10-4 and viscosity ratios in the range 0:05 to 0:2, i.e. a range of dimensionless parameters that spans the range expected during injection and subsequent evolution of CO2 in saline reservoirs. The resulting two-dimensional pattern is analyzed by identifying trapped wetting and non-wetting fluid blobs and measuring their area and interfacial contact length with the opposing fluid and the solid. From these individual measurements, we compute the residual fluid saturations, hydraulic radii distributions and fluid pattern correlations to comment on the capillary or viscous mechanisms at play at given conditions. Our measurements demonstrate how, for our particular micromodel, hydraulic radii distribution changes as the dimensionless parameters that describe the fluid displacement change. Using area of fluid blobs as a function of hydraulic radii and simplified dynamics, we propose an upscaling method to describe the approach to equilibrium after a fluid-fluid displacement. JF - American Geophysical Union Fall Meeting AU - Tarimala, S AU - Abdel-Fattah, A AU - Carey, J W AU - Backhaus, S AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H54C EP - 01 PB - American Geophysical Union, Washington, DC VL - 2011 KW - hydrology KW - toxic materials KW - patterns KW - carbon sequestration KW - capillary pressure KW - injection KW - pollution KW - porous materials KW - displacements KW - two-dimensional models KW - measurement KW - ground water KW - carbon dioxide KW - spatial distribution KW - viscosity KW - transport KW - brines KW - wettability KW - greenhouse gases KW - faults KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637536534?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Distributions+of+residual+fluid+in+non-wetting+invasions+in+porous+media&rft.au=Tarimala%2C+S%3BAbdel-Fattah%2C+A%3BCarey%2C+J+W%3BBackhaus%2C+S%3BAnonymous&rft.aulast=Tarimala&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H51E/abstracts/H54C-01.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - brines; capillary pressure; carbon dioxide; carbon sequestration; displacements; faults; greenhouse gases; ground water; hydrology; injection; measurement; patterns; pollution; porous materials; spatial distribution; toxic materials; transport; two-dimensional models; viscosity; wettability ER - TY - JOUR T1 - A fundamental study of gas formation and migration during leakage of stored carbon dioxide in subsurface formations AN - 1637536275; 2014-103449 AB - Geologic sequestration of CO2 has received significant attention as a potential method for reducing the release of greenhouse gases into the atmosphere. Potential risk of leakage of the stored CO2 to the shallow zones of the subsurface is one of the critical issues that is needed to be addressed to design effective field storage systems. If a leak occurs, gaseous CO2 reaching shallow zones of the subsurface can potentially impact the surface and groundwater sources and vegetation. With a goal of developing models that can predict these impacts, a research study is underway to improve our understanding of the fundamental processes of gas-phase formation and multi-phase flow dynamics during CO2 migration in shallow porous media. The approach involves conducting a series of highly controlled experiments in soil columns and tanks to study the effects of soil properties, temperature, pressure gradients and heterogeneities on gas formation and migration. This paper presents the results from a set of column studies. A 3.6 m long column was instrumented with 16 soil moisture sensors, 15 of which were capable of measuring electrical conductivity (EC) and temperature, eight water pressure, and two gas pressure sensors. The column was filled with test sands with known hydraulic and retention characteristics with predetermined packing configurations. Deionized water saturated with CO2 under nearly equal 0.3 kPa (roughly the same as the hydrostatic pressure at the bottom of the column) was injected at the bottom of the column using a peristaltic pump. Water and gas outflow at the top of the column were monitored continuously. The results, in general, showed that 1) gas phase formation can be triggered by multiple factors such as water pressure drop, temperature rise, and heterogeneity, 2) transition to gas phase tends to occur rather within a short period of time, 3) gas phase fraction was as high as nearly equal 40% so that gas flow was not via individual bubble movement but two-phase flow, 4) water outflow that was initially equal to the inflow rate increased when gas-phase started to form (i.e., water gets displaced), and 5) gas starts to flow upward after gas phase fraction stabilizes (i.e., buoyant force overcomes). These results suggest that the generation and migration processes of gas phase CO2 can be modelled as a traditional two-phase flow with source (when CO2 gas exsolved due to complex factors) as well as sink (when gas dissolved) terms. The experimental data will be used to develop and test the conceptual models that will guide the development of numerical simulators for applications involving CO2 storage and leakage. JF - American Geophysical Union Fall Meeting AU - Sakaki, T AU - Plampin, M R AU - Lassen, R N AU - Pawar, R J AU - Komatsu, M AU - Jensen, K H AU - Illangasekare, T H AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H51G EP - 1287 PB - American Geophysical Union, Washington, DC VL - 2011 KW - soils KW - electrical conductivity KW - two-phase models KW - carbon sequestration KW - numerical models KW - gaseous phase KW - moisture KW - unsaturated zone KW - atmosphere KW - porous materials KW - vegetation KW - fluid dynamics KW - simulation KW - seepage KW - ground water KW - carbon dioxide KW - buoyancy KW - mitigation KW - multiphase flow KW - theoretical models KW - greenhouse gases KW - hydrostatic pressure KW - dynamic properties KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637536275?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+fundamental+study+of+gas+formation+and+migration+during+leakage+of+stored+carbon+dioxide+in+subsurface+formations&rft.au=Sakaki%2C+T%3BPlampin%2C+M+R%3BLassen%2C+R+N%3BPawar%2C+R+J%3BKomatsu%2C+M%3BJensen%2C+K+H%3BIllangasekare%2C+T+H%3BAnonymous&rft.aulast=Sakaki&rft.aufirst=T&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H51G/abstracts/H51G-1287.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - atmosphere; buoyancy; carbon dioxide; carbon sequestration; dynamic properties; electrical conductivity; fluid dynamics; gaseous phase; greenhouse gases; ground water; hydrostatic pressure; mitigation; moisture; multiphase flow; numerical models; porous materials; seepage; simulation; soils; theoretical models; two-phase models; unsaturated zone; vegetation ER - TY - JOUR T1 - Quantifying the effects of fluid properties and flow rates on the effectiveness of capillary trapping of CO2 in a Bentheimer sandstone AN - 1637535115; 2014-103444 AB - Geologic sequestration of supercritical CO2 in subsurface saline aquifers is considered to be a feasible option for mitigation of anthropogenic CO2 emissions. Sequestration involves injection of supercritical CO2 (considered to be a brine drainage process), and the subsequent upward travel of the buoyant CO2 plume (during which the brine re-enters, or imbibes, back into the pore space). Ultimately, the CO2 can dissolve into the brine and precipitate to form carbonate minerals. However, these dissolution and precipitation processes are estimated to occur on long timescales (on the order of hundreds to thousands of years) and a mobile CO2 plume may exist in the subsurface until these reactions proceed to completion. Thus, effective trapping of the CO2 is necessary for a successful sequestration scenario. Trapping can be accomplished hydrodynamically with an impermeable cap rock serving to prevent upward migration of the CO2 plume; or via capillary trapping, in which CO2 is held by capillary forces within the pore structure of the geologic matrix. Utilizing capillary trapping decreases the risk of inadvertent leakage of CO2 (a risk associated with hydrodynamic trapping). This mechanism also breaks up the injected CO2 plume into small bubbles, increasing the surface area to volume ratio of the CO2 and enhancing dissolution and precipitation reactions. Accordingly, optimization of capillary trapping is critical to the effectiveness of geologic sequestration. This work utilizes computed x-ray microtomography (CMT) and various proxy fluids to quantify capillary trapping over a range of fluid properties and flow rates. A Bentheimer sandstone core is first flooded with brine containing varying amounts of surfactant. Then one of three non-wetting fluids is pumped through the core (drainage) and brine is imbibed again at varying flow rates. The fluids are chosen to represent the ranges of viscosity, density, and interfacial tension exhibited by supercritical CO2 under various pressure-temperature conditions. The flow conditions are chosen to represent a wide range of capillary numbers. The data will be analyzed for trends in the distribution and morphology of trapped non-wetting phase as a function of these fluid properties and flow rate. JF - American Geophysical Union Fall Meeting AU - Herring, A L AU - Wildenschild, D AU - Harper, E AU - Armstrong, R T AU - Carey, J W AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H51G EP - 1282 PB - American Geophysical Union, Washington, DC VL - 2011 KW - contaminant plumes KW - injection KW - solutes KW - sandstone KW - pollution KW - fluid flow KW - rates KW - capillarity KW - fluid dynamics KW - ground water KW - carbon dioxide KW - buoyancy KW - aquifers KW - physical properties KW - sedimentary rocks KW - surfactants KW - brines KW - traps KW - clastic rocks KW - carbonates KW - Bentheimer Sandstone KW - P-T conditions KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637535115?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Quantifying+the+effects+of+fluid+properties+and+flow+rates+on+the+effectiveness+of+capillary+trapping+of+CO2+in+a+Bentheimer+sandstone&rft.au=Herring%2C+A+L%3BWildenschild%2C+D%3BHarper%2C+E%3BArmstrong%2C+R+T%3BCarey%2C+J+W%3BAnonymous&rft.aulast=Herring&rft.aufirst=A&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/H/sessions/H51G/abstracts/H51G-1282.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; Bentheimer Sandstone; brines; buoyancy; capillarity; carbon dioxide; carbonates; clastic rocks; contaminant plumes; fluid dynamics; fluid flow; ground water; injection; P-T conditions; physical properties; pollution; rates; sandstone; sedimentary rocks; solutes; surfactants; traps ER - TY - JOUR T1 - Assessing the impact of CO (sub 2) and brine leakage on shallow groundwater quality; results from a natural analog study in New Mexico, USA AN - 1637533526; 2014-103339 AB - A vital aspect to public and regulatory acceptance of carbon sequestration is assurance that drinking water in overlying aquifers will be protected. Direct observations of CO (sub 2) flowing through shallow drinking water aquifers are invaluable for informing credible risk assessments. To this end, we have sampled shallow wells in a natural analog site in New Mexico, USA, where CO (sub 2) from natural sources is upwelling from depth, and have conducted laboratory experiments on aquifer sediments. Collectively, this work has generated insights into the processes controlling major ion and trace element geochemistry in a CO (sub 2) -rich system. One finding has been that impacts related to upwelling saline water far exceed those related to in-situ CO (sub 2) -induced trace metal mobilization. We have also developed 3-D reactive-transport simulations to represent the key aspects of this particular type of drinking water aquifer. In this paper we will summarize field and laboratory findings, and compare reactive-transport simulations with field data. We will then show how field-tested simulations can be used to predict the temporal evolution of shallow groundwater in hypothetical CO (sub 2) leakage scenarios. These simulations highlight the importance of transient, non-equilibrium effects. These effects should be carefully considered in risk assessments and monitoring network design. We conclude by presenting sensitivity analysis results showing the most important uncertain model parameters; these results can be used to guide future laboratory and field studies. JF - American Geophysical Union Fall Meeting AU - Keating, E H AU - Hakala, A AU - Viswanathan, H S AU - Carey, J W AU - Fessenden, J E AU - Pawar, R J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H32B EP - 07 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - water quality KW - carbon sequestration KW - pollution KW - New Mexico KW - hydrochemistry KW - drinking water KW - seepage KW - ground water KW - carbon dioxide KW - aquifers KW - sensitivity analysis KW - natural analogs KW - brines KW - risk assessment KW - water pollution KW - geochemistry KW - 02B:Hydrochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637533526?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Assessing+the+impact+of+CO+%28sub+2%29+and+brine+leakage+on+shallow+groundwater+quality%3B+results+from+a+natural+analog+study+in+New+Mexico%2C+USA&rft.au=Keating%2C+E+H%3BHakala%2C+A%3BViswanathan%2C+H+S%3BCarey%2C+J+W%3BFessenden%2C+J+E%3BPawar%2C+R+J%3BAnonymous&rft.aulast=Keating&rft.aufirst=E&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; brines; carbon dioxide; carbon sequestration; drinking water; geochemistry; ground water; hydrochemistry; natural analogs; New Mexico; pollution; risk assessment; seepage; sensitivity analysis; United States; water pollution; water quality ER - TY - JOUR T1 - Computational studies of two phase cement/CO (sub 2) /brine interaction in wellbore environments AN - 1637530298; 2014-103221 AB - Wellbore integrity is essential to ensuring long-term isolation of buoyant supercritical carbon dioxide (CO (sub 2) ) during geologic sequestration of CO (sub 2) . In this paper, we summarize recent progress in numerical simulations of cement/brine/CO (sub 2) interactions with respect to migration of CO (sub 2) outside of casting. Using typical values for the hydrologic properties of cement, caprock (shale), and reservoir materials, we show that the capillary properties of good-quality cement will prevent flow of CO (sub 2) into and through cement. Rather, CO (sub 2) , if present, is likely to be confined to the casting/cement or cement/formation interface. CO (sub 2) does react with the cement by diffusion from the interface into the cement, in which case it produces distinct carbonation fronts within the cement. This is consistent with observations of cement performance at the CO (sub 2) -enhanced-oil-recovery Scurry Area Canyon Reef Operators Committee (SACROC) unit in west Texas (Carey et al. 2007). For poor-quality cement, flow through cement may occur and would produce a pattern of uniform carbonation without reaction fronts. We also consider an alternative explanation for cement carbonation reactions as caused by CO (sub 2) derived from caprock. We show that carbonation reactions in cement are limited to surficial reactions when CO (sub 2) pressure is low (<10 bar), as might be expected in many caprock environments. For the case of caprock overlying natural CO (sub 2) reservoirs for millions of years, we consider the Scherer and Huet (2009) hypothesis of diffusive steady state between CO (sub 2) in the reservoir and in the caprock. We find that, in this case, the aqueous CO (sub 2) concentration would differ little from that in the reservoir and would be expected to produce carbonation reaction fronts in cements that are relatively uniform as a function of depth. JF - SPE Journal AU - Carey, J William AU - Lichtner, Peter C Y1 - 2011/12// PY - 2011 DA - December 2011 SP - 940 EP - 948 PB - Society of Petroleum Engineers, Richardson, TX VL - 16 IS - 4 SN - 1086-055X, 1086-055X KW - data processing KW - petroleum KW - gas storage KW - simulation KW - reservoir rocks KW - carbon dioxide KW - environmental management KW - oil wells KW - sedimentary rocks KW - chemical reactions KW - water-rock interaction KW - geochemistry KW - construction materials KW - carbon sequestration KW - shale KW - cement materials KW - biochemistry KW - carbonatization KW - capillarity KW - properties KW - recovery KW - organic compounds KW - boreholes KW - sedimentary petrology KW - brines KW - hydrocarbons KW - cap rocks KW - reservoir properties KW - clastic rocks KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637530298?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=SPE+Journal&rft.atitle=Computational+studies+of+two+phase+cement%2FCO+%28sub+2%29+%2Fbrine+interaction+in+wellbore+environments&rft.au=Carey%2C+J+William%3BLichtner%2C+Peter+C&rft.aulast=Carey&rft.aufirst=J&rft.date=2011-12-01&rft.volume=16&rft.issue=4&rft.spage=940&rft.isbn=&rft.btitle=&rft.title=SPE+Journal&rft.issn=1086055X&rft_id=info:doi/10.2118%2F126666-PA L2 - http://www.spe.org/papers/pubs/SPEjournal.php LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 11 N1 - PubXState - TX N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2014-12-18 N1 - SubjectsTermNotLitGenreText - biochemistry; boreholes; brines; cap rocks; capillarity; carbon dioxide; carbon sequestration; carbonatization; cement materials; chemical reactions; clastic rocks; construction materials; data processing; environmental management; gas storage; geochemistry; hydrocarbons; oil wells; organic compounds; petroleum; properties; recovery; reservoir properties; reservoir rocks; sedimentary petrology; sedimentary rocks; shale; simulation; water-rock interaction DO - http://dx.doi.org/10.2118/126666-PA ER - TY - JOUR T1 - Convective instability and mass transport of the diffusion layer in CO (sub 2) sequestration AN - 1629939938; 2014-092481 AB - The long-term fate of supercritical (sc) CO (sub 2) in saline aquifers is critical to the security of carbon sequestration, an important option for eliminating or reducing the emissions of this most prevalent greenhouse gas. scCO (sub 2) is less dense than brine and floats to the top of the aquifer where it is trapped in a metastable state by a geologic feature such as a low permeability cap rock. Dissolution into the underlying brine creates a CO (sub 2) -brine mixture that is denser than brine, eliminating buoyancy and removing the threat of CO (sub 2) escaping back to the atmosphere. If molecular diffusion were the only dissolution mechanism, the CO (sub 2) waste stream from a typical large coal-fired electrical power plant may take upward of 10,000 years to no longer pose a threat, however, a convective instability of the dense diffusion boundary layer between the scCO (sub 2) and the brine can dramatically increase the dissolution rates, shortening the lifetime of the scCO (sub 2) waste pool. We present results of 2D and 3D similitude-correct, laboratory-scale experiments using an analog fluid system. The experiments and flow visualization reveal the onset of the convective instability, the dynamics of the fluid flows during the convective processes, and the long-term mass transfer rates. JF - American Geophysical Union Fall Meeting AU - Backhaus, S AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract GC51A EP - 0941 PB - American Geophysical Union, Washington, DC VL - 2011 KW - water quality KW - carbon sequestration KW - three-dimensional models KW - injection KW - stability KW - solutes KW - simulation KW - layered materials KW - two-dimensional models KW - ground water KW - carbon dioxide KW - aquifers KW - transport KW - brines KW - mass transfer KW - saline composition KW - diffusivity KW - boundary layer KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629939938?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Convective+instability+and+mass+transport+of+the+diffusion+layer+in+CO+%28sub+2%29+sequestration&rft.au=Backhaus%2C+S%3BAnonymous&rft.aulast=Backhaus&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/GC/sessions/GC51A/abstracts/GC51A-0941.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; boundary layer; brines; carbon dioxide; carbon sequestration; diffusivity; ground water; injection; layered materials; mass transfer; saline composition; simulation; solutes; stability; three-dimensional models; transport; two-dimensional models; water quality ER - TY - JOUR T1 - Experimental determination of supercritical CO (sub 2) mass transfer rates into brine AN - 1629939747; 2014-092482 AB - Flexible gold bag hydrothermal autoclaves and were used to measure the dissolution rate of supercritical (sc) CO (sub 2) into brine. To simulate dissolution into brine in a porous media, a sand packed stainless-steel autoclave was utilized. 1 m NaCl brine was tested at 40 and 75 degrees C, and pre-injection pressures of 10 and 20 MPa. Liquid CO (sub 2) was quantitatively injected into reactors, where it converts rapidly to a supercritical fluid in the hot reactor. Reactors were oriented horizontally through the duration of the experiments to maximize contact surface area between the fluids and they were not mechanically mixed. The pressure in the experiments was allowed to rise during injection. The pressure decay was logged as scCO (sub 2) transferred into brine. This decay curve was used to calculate the mass transfer rates of scCO (sub 2) to brine. CO (sub 2) analysis of the brine at steady state pressure conditions was used to calculate the solubility. The measured solubility of CO (sub 2) into brine at these conditions compares well to the predicted values from Duan and Sun (2003). Calculated rates for scCO (sub 2) mass transfer are significantly lower than published values for CO (sub 2) hydration, indicating that the experiments are mass transfer limited and not limited by chemical kinetics at these conditions. Mass transfer rates in the brine only experiments were 3-5 E-07 mol/cm (super 2) s, comparable to other published experiments at lower pressures (Yang and Gu 2006). The mass transfer rate into the brine + porous media experiment was significantly lower at approximately 5 E-08 mol/cm (super 2) s. Calculated effective diffusion coefficients for the brine and brine + porous media experiments were approximately 0.1 - 3 E-03 cm (super 2) /s and approximately 4 E-05 cm (super 2) /s, respectively. These experimental results are compared to model simulations using a simple diffusion model and numerical methods in 3-D with PFLOTRAN and FEHM. Although rates are relatively rapid for high permeability situations, the permeability of the porous media significantly impacts the mass transfer rates. The assumption of simple equilibrium in predicting the behavior of a sequestration reservoir is likely adequate for long time periods, these results suggest that effective near-well and near-term reservoir pressure management may require inclusion of scCO (sub 2) mass transfer processes. JF - American Geophysical Union Fall Meeting AU - Newell, D L AU - Viswanathan, H S AU - Lichtner, P C AU - Carey, J W AU - Thyne, G AU - Kaszuba, John P AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract GC51A EP - 0942 PB - American Geophysical Union, Washington, DC VL - 2011 KW - water quality KW - sand KW - PFLOTRAN KW - experimental studies KW - numerical models KW - clastic sediments KW - injection KW - solutes KW - fluid flow KW - porous materials KW - global change KW - solubility KW - equilibrium KW - carbon dioxide KW - models KW - laboratory studies KW - hydration KW - brines KW - sediments KW - mass transfer KW - geochemistry KW - 22:Environmental geology KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629939747?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Experimental+determination+of+supercritical+CO+%28sub+2%29+mass+transfer+rates+into+brine&rft.au=Newell%2C+D+L%3BViswanathan%2C+H+S%3BLichtner%2C+P+C%3BCarey%2C+J+W%3BThyne%2C+G%3BKaszuba%2C+John+P%3BAnonymous&rft.aulast=Newell&rft.aufirst=D&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/GC/sessions/GC51A/abstracts/GC51A-0942.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - brines; carbon dioxide; clastic sediments; equilibrium; experimental studies; fluid flow; geochemistry; global change; hydration; injection; laboratory studies; mass transfer; models; numerical models; PFLOTRAN; porous materials; sand; sediments; solubility; solutes; water quality ER - TY - JOUR T1 - Basin scale reactive-transport simulations of CO (sub 2) leakage and resulting metal transport in a shallow drinking water aquifer AN - 1629939721; 2014-092476 AB - Leakage of CO (sub 2) from underground storage formations into overlying aquifers will decrease groundwater pH resulting in a geochemical response of the aquifer. If metal containing aquifer minerals dissolve as a part of this response, there is a risk of exceeding regulatory limits set by the EPA. Risk assessment methods require a realistic prediction of the maximum metal concentration at wells or other points of exposure. Currently, these predictions are based on numerical reactive transport simulations of CO (sub 2) leaks. While previous studies have simulated galena dissolution as a source of lead to explore the potential for contamination of drinking water aquifers, it may be more realistic to simulate lead release from more common minerals that are known to contain trace amounts of metals, e.g. calcite. Model domains for these previous studies are often sub-km in scale or have very coarse grid resolution, due to computation limitations. In this study we simulate CO (sub 2) leakage into a drinking water aquifer using the massively parallel subsurface flow and reactive transport code PFLOTRAN. The regional model domain is 4 km X 1 km X 0.1 km. Even with fairly coarse grid spacing ( approximately 9 m X 9 m X 0.9 m), the simulations have > 49 million degrees of freedom, requiring the use of High-Performance Computing (HPC). Our simulations are run on Jaguar at Oak Ridge National Laboratory. Lead concentrations in extraction wells 3 km down gradient from a CO (sub 2) leak increase above background concentrations due to kinetic mineral dissolution along the flow path. Increases in aqueous concentrations are less when lead is allowed to sorb onto mineral surfaces. Surprisingly, lead concentration increases are greater in simulations where lead is present as a trace constituent in calcite (5% by volume) relative to simulations with galena (0.001% by volume) as the lead source. It appears that galena becomes oversaturated and begins to precipitate, a result observed in previous modeling studies, and its low solubility buffers the lead concentration to low values. Results from these models suggest that using pure end member metal sulfides to simulate metal release in aquifers impacted by a CO (sub 2) leak may be problematic. Additional model simulations run on a higher resolution grid where hydraulic conductivity is assigned at each grid cell geostatistically to more accurately simulate metal behavior, will also be presented. JF - American Geophysical Union Fall Meeting AU - Navarre-Sitchler, A K AU - Maxwell, R M AU - Hammond, Glenn E AU - Lichtner, P C AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract GC51A EP - 0936 PB - American Geophysical Union, Washington, DC VL - 2011 KW - toxic materials KW - numerical models KW - solutes KW - pollution KW - lead KW - fluid flow KW - simulation KW - drinking water KW - seepage KW - ground water KW - carbon dioxide KW - aquifers KW - galena KW - transport KW - metals KW - reactive transport KW - shallow aquifers KW - sulfides KW - pH KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629939721?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Basin+scale+reactive-transport+simulations+of+CO+%28sub+2%29+leakage+and+resulting+metal+transport+in+a+shallow+drinking+water+aquifer&rft.au=Navarre-Sitchler%2C+A+K%3BMaxwell%2C+R+M%3BHammond%2C+Glenn+E%3BLichtner%2C+P+C%3BAnonymous&rft.aulast=Navarre-Sitchler&rft.aufirst=A&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/GC/sessions/GC51A/abstracts/GC51A-0936.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; carbon dioxide; drinking water; fluid flow; galena; ground water; lead; metals; numerical models; pH; pollution; reactive transport; seepage; shallow aquifers; simulation; solutes; sulfides; toxic materials; transport ER - TY - JOUR T1 - Microseismic monitoring during CO (sub 2) injection at the aneth oil field; constraining source depths using reflected phases detected on a single vertical receiver array AN - 1629938549; 2014-092460 AB - We have monitored microseismicity during a CO (sub 2) enhanced oil recovery operation in the Aneth oil field of southeast Utah. A 60-level, 900-m-length geophone array was cemented into a monitoring well with the deepest sonde placed at a depth of 1700 m, approximately 30 m above the top of the oil reservoir. During the first year of monitoring approximately 3800 microearthquakes with moment magnitude ranging from -1.2 to 0.8 were detected within about 4.8 km of the geophone array. The events delineate two distinct structures active on opposite flanks of the oil field. Over 96% of events detected occur along a NW-SE trending fracture zone over 1500 m long, but located from 1 to 3 km from the monitor well. Due to the large offsets from the geophone string, we have supplemented the direct P- and S-wave arrivals with multiple reflected phases to effectively lengthen the aperture of the vertical array and help constrain source depths. To identify reflected arrivals, we used R*Z analysis which is the product of radial and vertical components. For inclined wave paths, R*Z traces enhance the arrivals of P and SV plane waves because the amplitudes of R and Z component increase together at these wave onsets. Multiple SV reflections from the top and bottom of a thick salt interval beneath the oil reservoir were identified on selected, high signal-to-noise master events along the structures length. We computed synthetic seismograms to verify the origins of the reflected phases. The master events were located using the direct P and SV arrival times plus the SV reflections from the salt interval. The remaining events were then tied in a relative sense to the masters using correlated picks of the direct P and SV phases only. The active structure is about 335 m beneath the oil reservoir, at a depth of 2120 m, just beneath the salt interval and near the top of the Mississippian Leadville limestone. The NW-SE strike is consistent with the prevalent orientation of basement faults of Mississippian and Pennsylvanian age seen on a 3D seismic survey collected over the study area and with the prevalent structural fabric of the region. The time-space evolution of the seismicity and the seismic recurrence (b-value = 2) suggest the structure is composed of a number of discontinuous fault or fracture segments. We found no clear or consistent correlations of the seismicity and moment release rates with injection and production rates in the study area. The source locations on opposite flanks of the oil reservoir suggest it may be associated with stress changes driven by reservoir volume reduction over the field's 50-plus-year production history. JF - American Geophysical Union Fall Meeting AU - Rutledge, J T AU - Soma, N AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract GC51A EP - 0916 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - limestone KW - SV-waves KW - P-waves KW - Mississippian KW - observation wells KW - elastic waves KW - oil and gas fields KW - carbon dioxide KW - fractures KW - Aneth Field KW - sedimentary rocks KW - seismicity KW - seismograms KW - body waves KW - monitoring KW - microseismic methods KW - Paleozoic KW - injection KW - Carboniferous KW - southwestern Utah KW - Leadville Formation KW - Utah KW - seismic waves KW - carbonate rocks KW - microearthquakes KW - earthquakes KW - S-waves KW - arrays KW - 19:Seismology KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629938549?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Microseismic+monitoring+during+CO+%28sub+2%29+injection+at+the+aneth+oil+field%3B+constraining+source+depths+using+reflected+phases+detected+on+a+single+vertical+receiver+array&rft.au=Rutledge%2C+J+T%3BSoma%2C+N%3BAnonymous&rft.aulast=Rutledge&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/GC/sessions/GC51A/abstracts/GC51A-0916.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Aneth Field; arrays; body waves; carbon dioxide; carbonate rocks; Carboniferous; earthquakes; elastic waves; fractures; injection; Leadville Formation; limestone; microearthquakes; microseismic methods; Mississippian; monitoring; observation wells; oil and gas fields; P-waves; Paleozoic; S-waves; sedimentary rocks; seismic waves; seismicity; seismograms; southwestern Utah; SV-waves; United States; Utah ER - TY - JOUR T1 - Response surfaces for CO (sub 2) leakage from geologic storage along abandoned wellbores AN - 1629937811; 2014-092485 AB - The storage of carbon dioxide (CO (sub 2) ) in geologic reservoirs that have previously been drilled for oil and gas exploration is under investigation worldwide as an option for reducing the amount of anthropogenic carbon introduced to the atmosphere. Reservoirs that have already been tapped for hydrocarbon production have several benefits over development of new sites: they tend to be geologically well-understood, with existing wellbore data to help further characterize the local geologic framework; are known to be conducive to trapping buoyant or pressurized fluids; may have infrastructure in place; and are likely to be already impacted ecologically as compared to pristine sites. One downside to using depleted hydrocarbon reservoirs is the potential for CO (sub 2) leakage along pre-existing wellbores that were either not designed for CO (sub 2) sequestration or have been improperly plugged and abandoned. The primary goal of this study is to develop estimates of possible wellbore leakage rates of CO (sub 2) from storage reservoirs to the surface and/or into overlaying aquifers, as a function of wellbore properties and the surrounding geologic framework. The Finite Element Heat and Mass transfer code (FEHM) was used to perform Monte Carlo simulations of multiphase flow along wellbores across a wide range of geologic and wellbore parameters. Several wellbore scenarios were studied, including a simple wellbore between the CO (sub 2) storage reservoir and the surface; a wellbore intersecting a saline aquifer ("thief zone"); and a wellbore intersecting both a thief zone and a freshwater aquifer. The Problem Solving environment for Uncertainty Analysis and Design Exploration (PSUADE) software was used to analyze results and produce response surfaces for the estimation of wellbore flow rate as a function of the primary factors that influence leakage. These results will be used to develop abstractions for leakage rates to be incorporated in performance assessments of geologic CO (sub 2) storage, which will help to determine the feasibility of this vast potential resource for the capture and sequestration of CO (sub 2) . JF - American Geophysical Union Fall Meeting AU - Jordan, A AU - Carey, J W AU - Pawar, R J AU - Stauffer, P H AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract GC51A EP - 0945 PB - American Geophysical Union, Washington, DC VL - 2011 KW - toxic materials KW - carbon sequestration KW - pollution KW - enhanced recovery KW - preferential flow KW - seepage KW - oil and gas fields KW - reservoir rocks KW - ground water KW - carbon dioxide KW - buoyancy KW - aquifers KW - models KW - organic compounds KW - boreholes KW - hydrocarbons KW - greenhouse gases KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629937811?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Response+surfaces+for+CO+%28sub+2%29+leakage+from+geologic+storage+along+abandoned+wellbores&rft.au=Jordan%2C+A%3BCarey%2C+J+W%3BPawar%2C+R+J%3BStauffer%2C+P+H%3BAnonymous&rft.aulast=Jordan&rft.aufirst=A&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/GC/sessions/GC51A/abstracts/GC51A-0945.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - aquifers; boreholes; buoyancy; carbon dioxide; carbon sequestration; enhanced recovery; greenhouse gases; ground water; hydrocarbons; models; oil and gas fields; organic compounds; pollution; preferential flow; reservoir rocks; seepage; toxic materials ER - TY - JOUR T1 - Investigation of volcanic seismo-acoustic signals; applying subspace detection to lava fountain activity at Etna Volcano AN - 1623260098; 2014-087574 AB - The current eruption of Mount Etna, which began in January, 2011, has produced numerous energetic episodes of lava fountaining, which have bee recorded by the INGV seismic and acoustic sensors located on and around the volcano. The source of these events was the pit crater on the east flank of the Southeast crater of Etna. Simultaneously, small levels of activity were noted in the Bocca Nuova as well, prior to its lava fountaining activity. We will present an analysis of seismic and acoustic signals related to the 2011 activity wherein we apply the method of subspace detection to determine whether the source exhibits a temporal evolution within or between fountaining events, or otherwise produces repeating, classifiable events occurring through the continuous explosive degassing. We will examine not only the raw waveforms, but also spectral variations in time as well as time-varying statistical functions such as signal skewness and kurtosis. These results will be compared to straightforward cross-correlation analysis. In addition to classification performance, the subspace method has promise to outperform standard STA/LTA methods for real-time event detection in cases where similar events can be expected. JF - American Geophysical Union Fall Meeting AU - Sciotto, M AU - Rowe, C A AU - Cannata, A AU - Arrowsmith, S AU - Privitera, E AU - Gresta, S AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract V53E EP - 2685 PB - American Geophysical Union, Washington, DC VL - 2011 KW - monitoring KW - lava flows KW - geologic hazards KW - lava fountains KW - Mount Etna KW - geophysical methods KW - Europe KW - Italy KW - Southern Europe KW - seismic methods KW - acoustical methods KW - volcanic risk KW - Sicily Italy KW - detection KW - lava KW - eruptions KW - natural hazards KW - volcanoes KW - 24:Quaternary geology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623260098?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Investigation+of+volcanic+seismo-acoustic+signals%3B+applying+subspace+detection+to+lava+fountain+activity+at+Etna+Volcano&rft.au=Sciotto%2C+M%3BRowe%2C+C+A%3BCannata%2C+A%3BArrowsmith%2C+S%3BPrivitera%2C+E%3BGresta%2C+S%3BAnonymous&rft.aulast=Sciotto&rft.aufirst=M&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - acoustical methods; detection; eruptions; Europe; geologic hazards; geophysical methods; Italy; lava; lava flows; lava fountains; monitoring; Mount Etna; natural hazards; seismic methods; Sicily Italy; Southern Europe; volcanic risk; volcanoes ER - TY - JOUR T1 - Simulation studies on enhanced geothermal systems with CO2 as a working fluid AN - 1623259718; 2014-087339 AB - Supercritical CO2 has recently been considered as a working fluid in enhanced geothermal systems (EGS), given its non-ionic nature, larger expansivity and lower viscosity compared to water. In addition, an EGS with supercritical CO2 as a working fluid may also act as a mechanism for CO2 sequestration. To explore this, one must understand the various interactions that may take place between the reservoir rock and the supercritical CO2. In this work, we perform simulations in two and three dimensions using the massively parallel flow and transport code PFLOTRAN, to study these interactions under various conditions (aqueous, non-aqueous and two-phase). The two dimensional results using PFLOTRAN are compared with simulations made using the TOUGH2 code. Numerical studies examining mineral dissolution and precipitation reactions that may occur in EGS that use supercritical CO2 are also shown, in addition to preliminary indications of which well placements may enable optimal flow rates and simultaneous CO2 sequestration. JF - American Geophysical Union Fall Meeting AU - Karra, S AU - Ayling, B AU - Han, W AU - Lichtner, P C AU - Lu, C AU - McPherson, Brian J AU - McLin, K S AU - Moore, J AU - Pan, F AU - Rose, P E AU - Xu, T AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract H21C EP - 1126 PB - American Geophysical Union, Washington, DC VL - 2011 KW - TOUGH2 KW - geothermal energy KW - computer programs KW - petroleum engineering KW - carbon sequestration KW - numerical models KW - viscosity KW - three-dimensional models KW - enhanced recovery KW - simulation KW - carbon dioxide KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623259718?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Simulation+studies+on+enhanced+geothermal+systems+with+CO2+as+a+working+fluid&rft.au=Karra%2C+S%3BAyling%2C+B%3BHan%2C+W%3BLichtner%2C+P+C%3BLu%2C+C%3BMcPherson%2C+Brian+J%3BMcLin%2C+K+S%3BMoore%2C+J%3BPan%2C+F%3BRose%2C+P+E%3BXu%2C+T%3BAnonymous&rft.aulast=Karra&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - carbon dioxide; carbon sequestration; computer programs; enhanced recovery; geothermal energy; numerical models; petroleum engineering; simulation; three-dimensional models; TOUGH2; viscosity ER - TY - JOUR T1 - Geologic map of the Valles Caldera, Jemez Mountains, New Mexico AN - 1612261980; 2014-079655 AB - Valles Caldera is famous as the type locality of large resurgent calderas (Smith and Bailey, 1968), the location of a classic 260-300 degrees C liquid-dominated geothermal system (Goff and Gardner, 1994), and the site of a long-lived late Pleistocene lake (Fawcett et al., 2011). We have published a detailed color geologic map of the Valles Caldera and surrounding areas at 1:50,000 scale obtainable from New Mexico Bureau of Geology and Mineral Resources (geoinfo.nmt.edu/publications/maps/geologic/gm/79/). The new Valles map has been compiled from all or parts of nine 1:24,000 geologic maps completed between 2004 and 2008 (Bland, Cerro del Grant, Jarosa, Jemez Springs, Polvadera Peak, Redondo Peak, Seven Springs, Valle San Antonio, and Valle Toledo). Our map provides more detailed geology on the resurgent dome, caldera collapse breccias, post-caldera lava and tuff eruptions, intracaldera sedimentary and lacustrine deposits, and precaldera volcanic and sedimentary rocks than previous maps and incorporates recent stratigraphic revisions to the geology of the Jemez Mountains volcanic field. Three cross sections supported by surface geology, geophysical data and deep borehole logs (< or =4500 m) show an updated view of the caldera interior, depict a modern interpretation of caldera collapse and resurgence, and provide caldera-wide subsurface isotherms (< or =500 degrees C). A 30 page booklet included with the map contains extensive rock descriptions for 162 stratigraphic units and figures showing physiographic features, structural relations between Valles (1.25 Ma) and the earlier, comparably sized Toledo Caldera (1.62 Ma), correlation charts of map units, and the distribution of pre- and post-caldera hydrothermal alteration styles, including recently documented zeolite-type alteration. Finally, the booklet includes a generalized model showing our interpretation of intracaldera structure and subjacent magma chambers, and relations of Valles to earlier Quaternary-Precambrian units. References: Fawcett, P. J., et al., 2011, Nature, V. 470, p. 518-521. Goff, F. and Gardner, J. N., 1994, Economic Geology, V. 89, p. 1803-1832. Smith, R. L., and Bailey, R. A., 1968, Geological Society of America, Memoir 116, p. 613-662. JF - American Geophysical Union Fall Meeting AU - Goff, F AU - Gardner, J N AU - Reneau, S L AU - Kelley, S A AU - Kempter, K A AU - Lawrence, J R AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract V13C EP - 2606 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - stratigraphy KW - volcanic rocks KW - Quaternary KW - geologic hazards KW - igneous rocks KW - magmatism KW - lakes KW - mapping KW - New Mexico KW - Cenozoic KW - volcanic risk KW - volcanic features KW - geothermal systems KW - Valles Caldera KW - natural hazards KW - Pleistocene KW - Jemez Mountains KW - resurgence KW - tectonics KW - geochemistry KW - 23:Geomorphology KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612261980?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Geologic+map+of+the+Valles+Caldera%2C+Jemez+Mountains%2C+New+Mexico&rft.au=Goff%2C+F%3BGardner%2C+J+N%3BReneau%2C+S+L%3BKelley%2C+S+A%3BKempter%2C+K+A%3BLawrence%2C+J+R%3BAnonymous&rft.aulast=Goff&rft.aufirst=F&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - Number of references - 2 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Cenozoic; geochemistry; geologic hazards; geothermal systems; igneous rocks; Jemez Mountains; lakes; magmatism; mapping; natural hazards; New Mexico; Pleistocene; Quaternary; resurgence; stratigraphy; tectonics; United States; Valles Caldera; volcanic features; volcanic risk; volcanic rocks ER - TY - JOUR T1 - Joint imaging of the crust beneath the southeastern margin of the Tibetan Plateau using body wave travel times and surface wave dispersion curves AN - 1553087578; 2014-063097 AB - The southeast margin of the Tibetan Plateau lies between the heartland of the plateau to the west and the stable south China block to the east, spanning from western Sichuan to central Yunnan in southwest China. A channel flow model in which a weak zone exists in the mid-to-lower crust has been proposed to explain the low-gradient topographic slope and lack of large-scale young crustal shortening at the southeast plateau margin. Both seismic body wave tomography and surface wave array tomography have revealed widespread zones of low shear wave velocity at mid- or low-crustal depth. However, the spatial distribution and interconnectivity between low velocity zones are not very clear mainly due to intrinsic resolution limitation of individual methods. In this study, we aim at improving the velocity model by joint seismic imaging using seismic travel times and surface wave dispersion curves. The body wave travel times are collected from the Sichuan Provincial Seismological stations for the period of 2001-2004. The surface-wave dispersion curves for periods between 10-150 s are obtained from ambient noise and teleseismic surface-wave two-station analysis using array data from 75 broadband stations in SE Tibet. The joint inversion code is based on the double-difference seismic tomography package tomoFDD. The travel times between events and stations are calculated using the finite-difference travel time calculation method based on Eikonal equation. The imaging results using seismic travel times show that low velocity zones are bounded by or distributed along major faults. The feature appears more clearly on the Vp model. Since short and intermediate period surface-wave dispersion data provide good constraints on the crustal Vs structure and are also quite sensitive to the crustal Vp structure, we expect that the crustal Vs and Vp models will be better constrained by jointly inverting body-wave travel time and surface wave dispersion data. We hope to better characterize the geometry of low velocity zones and their spatial relationship with major faults in the study region. JF - American Geophysical Union Fall Meeting AU - Zhang, H AU - Maceira, M AU - Yao, H AU - van der Hilst, R AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract T53E EP - 08 PB - American Geophysical Union, Washington, DC VL - 2011 KW - body waves KW - imagery KW - Far East KW - guided waves KW - southwestern China KW - Sichuan China KW - elastic waves KW - low-velocity zones KW - surface waves KW - Tibetan Plateau KW - Yunnan China KW - traveltime KW - seismic waves KW - wave dispersion KW - Asia KW - faults KW - crust KW - China KW - 19:Seismology KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1553087578?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Joint+imaging+of+the+crust+beneath+the+southeastern+margin+of+the+Tibetan+Plateau+using+body+wave+travel+times+and+surface+wave+dispersion+curves&rft.au=Zhang%2C+H%3BMaceira%2C+M%3BYao%2C+H%3Bvan+der+Hilst%2C+R%3BAnonymous&rft.aulast=Zhang&rft.aufirst=H&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-08-14 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Asia; body waves; China; crust; elastic waves; Far East; faults; guided waves; imagery; low-velocity zones; seismic waves; Sichuan China; southwestern China; surface waves; Tibetan Plateau; traveltime; wave dispersion; Yunnan China ER - TY - JOUR T1 - Field geophysics at SAGE; strategies for effective education AN - 1553085932; 2014-061016 AB - SAGE (Summer of Applied Geophysical Experience) is a unique program of education and research in geophysical field methods for undergraduate and graduate students from any university and for professionals. The core program is held for 4 weeks each summer in New Mexico and for an additional week in the following academic year in San Diego for U.S. undergraduates supported by the NSF Research Experience for Undergraduates (REU) program. Since SAGE was initiated in 1983, 730 students have participated in the program. NSF REU funding for SAGE began in 1990 and 319 REU students have completed SAGE through 2011. The primary objectives of SAGE are to teach the major geophysical exploration methods (seismic, gravity, magnetics, electromagnetics); apply these methods to the solution of specific problems (environmental, archaeological, hydrologic, geologic structure and stratigraphy); gain experience in processing, modeling and interpretation of geophysical data; and integrate the geophysical models and interpretations with geology. Additional objectives of SAGE include conducting research on the Rio Grande rift of northern New Mexico, and providing information on geophysics careers and professional development experiences to SAGE participants. Successful education, field and research strategies that we have implemented over the years include: 1. learn by doing; 2. mix lecture/discussion, field work, data processing and analysis, modeling and interpretation, and presentation of results; 3. a two-tier team approach - method/technique oriented teams and interpretation/integration teams (where each team includes persons representing different methods), provides focus, in-depth study, opportunity for innovation, and promotes teamwork and a multi-disciplinary approach; 4. emphasis on presentations/reports - each team (and all team members) make presentation, each student completes a written report; 5. experiment design discussion - students help design field program and consider issues - safety, constraints, data quality/quantity, research objective, educational experience, survey parameters, why multidisciplinary?, etc.; 6. knowledge of multiple geophysical field methods (each student works with all methods); 7. information on geophysics careers and networking provided by industry visitors; 8. measures of success of the program include high rate of continuation to graduate school and careers in geophysics, support and feedback from industry participants and visitors, student evaluations at end of program, presentations at professional meetings, publications, and faculty evaluation of student work. JF - American Geophysical Union Fall Meeting AU - Braile, L W AU - Baldridge, W S AU - Jiracek, G R AU - Biehler, S AU - Ferguson, J F AU - Pellerin, L AU - McPhee, D K AU - Bedrosian, P A AU - Snelson, C M AU - Hasterok, D P AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract ED13D EP - 03 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - programs KW - technology KW - site exploration KW - geophysical methods KW - techniques KW - New Mexico KW - education KW - Summer of Applied Geophysical Experience KW - college-level education KW - educational resources KW - geoscience KW - applications KW - field studies KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1553085932?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Field+geophysics+at+SAGE%3B+strategies+for+effective+education&rft.au=Braile%2C+L+W%3BBaldridge%2C+W+S%3BJiracek%2C+G+R%3BBiehler%2C+S%3BFerguson%2C+J+F%3BPellerin%2C+L%3BMcPhee%2C+D+K%3BBedrosian%2C+P+A%3BSnelson%2C+C+M%3BHasterok%2C+D+P%3BAnonymous&rft.aulast=Braile&rft.aufirst=L&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/ED/sessions/ED13D/abstracts/ED13D-03.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-08-14 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - applications; college-level education; education; educational resources; field studies; geophysical methods; geoscience; New Mexico; programs; site exploration; Summer of Applied Geophysical Experience; techniques; technology; United States ER - TY - JOUR T1 - Modeling the generation of infrasound from earthquakes AN - 1553085928; 2014-060974 AB - Earthquakes can generate complex seismoacoustic wavefields, consisting of seismic waves, epicenter-coupled infrasound, and secondary infrasound. We report on the development of a numerical seismoacoustic model for the generation of infrasound from earthquakes. We model the generation of seismic waves using a 3D finite difference algorithm that accounts for the earthquake moment tensor, source time function, depth, and local geology. The resultant acceleration-time histories (on a 2D grid at the surface) provide the initial conditions for modeling the near-field infrasonic pressure wave using the Rayleigh integral. Finally, we propagate the near-field source pressure through the Ground-to-Space atmospheric model using a time-domain parabolic equation technique. The modeling is applied to an earthquake of MW 4.6, that occurred on January 3, 2011 in Circleville, Utah; the ensuing predictions are in good agreement with observations made at the Utah network of infrasonic arrays, which are unique and indicate that the signals recorded at 6 arrays are from the epicentral region. These results suggest that measured infrasound from the Circleville earthquake is consistent with the generation of infrasound from body waves in the epicentral region. JF - American Geophysical Union Fall Meeting AU - Arrowsmith, S AU - Whitaker, R W AU - Burlacu, R AU - Pankow, K L AU - Stump, B W AU - Hayward, C AU - Stead, R AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract A43E EP - 05 PB - American Geophysical Union, Washington, DC VL - 2011 KW - monitoring KW - three-dimensional models KW - geophysical methods KW - elastic waves KW - wave fields KW - models KW - gravity methods KW - acoustical methods KW - Cicleville Utah KW - seismicity KW - epicenters KW - seismic waves KW - earthquakes KW - dynamic properties KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1553085928?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Modeling+the+generation+of+infrasound+from+earthquakes&rft.au=Arrowsmith%2C+S%3BWhitaker%2C+R+W%3BBurlacu%2C+R%3BPankow%2C+K+L%3BStump%2C+B+W%3BHayward%2C+C%3BStead%2C+R%3BAnonymous&rft.aulast=Arrowsmith&rft.aufirst=S&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2011/FM/sections/A/sessions/A43E/abstracts/A43E-05.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-08-14 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - acoustical methods; Cicleville Utah; dynamic properties; earthquakes; elastic waves; epicenters; geophysical methods; gravity methods; models; monitoring; seismic waves; seismicity; three-dimensional models; wave fields ER - TY - JOUR T1 - An overview of the source physics experiments (SPE) at the Nevada national security site (NNSS) AN - 1549621275; 2014-056897 AB - Modeling of explosion phenomenology has been primarily empirically based when looking at the seismic, infrasound, and acoustic signals. In order to detect low-yield nuclear explosions under the Comprehensive Nuclear Test-Ban Treaty (CTBT), we must be able to understand and model the explosive source in settings beyond where we have empirical data. The Source Physics Experiments (SPE) at the Nevada National Security Site are the first step in this endeavor to link the empirically based with the physics-based modeling to develop this predictive capability. The current series of tests is being conducted in a granite body called the Climax Stock. This location was chosen for several reasons, including the site's expected "simple geology"--the granite is a fairly homogeneous body. In addition, data are available from underground nuclear tests that were conducted in the same rock body, and the nature of the geology has been well-documented. Among the project goals for the SPE is to provide fully coupled seismic energy to the seismic and acoustic seismic arrays so that the transition between the near and far-field data can be modeled and our scientists can begin to understand how non-linear effects and anisotropy control seismic energy transmission and partitioning. The first shot for the SPE was conducted in May 2011 as a calibration shot (SPE1) with 220 lb (100 kg) of chemical explosives set at a depth of 180 ft (55 m). An array of sensors and diagnostics recorded the shot data, including accelerometers, geophones, rotational sensors, short-period and broadband seismic sensors, Continuous Reflectometry for Radius vs. Time Experiment (CORRTEX), Time of Arrival (TOA), Velocity of Detonation (VOD) as well as infrasound sensors. The three-component accelerometer packages were set at depths of 180 ft (55 m), 150 ft (46 m), and 50 ft (15 m) in two rings around ground zero (GZ); the inner ring was at 10 m and the outer ring was 20 m from GZ. Six sets of surface accelerometers (100 and 500 g) were placed along in an azimuth of SW from GZ every 10 m. Seven infrasound sensors were placed in an array around the GZ, extending from tens of meters to kilometers. Over 100 seismic stations were positioned, most of which were in five radial lines from GZ out to 2 km. Over 400 data channels were recorded for SPE1, and data recovery was about 95% with high signal to noise ratio. Future tests will be conducted in the same shot hole as SPE1. The SPE2 experiment will consist of 2200 lb (1000 kg) of chemical explosives shot at 150 ft (46 m) depth utilizing the above-described instrumentation. Subsequent SPE shots will be the same size, within the same shot hole, and within the damage zone. The ultimate goal of the SPE Project is to develop predictive capability for using seismic energy as a tool for CTBT issues. This work was done by National Security Technologies, LLC, under Contract No. DE AC52 06NA25946 with the U.S. Department of Energy. JF - American Geophysical Union Fall Meeting AU - Snelson, C M AU - Barker, D L AU - White, R L AU - Emmitt, R F AU - Townsend, M J AU - Graves, T E AU - Becker, S A AU - Teel, M G AU - Lee, P AU - Antoun, T H AU - Rodgers, A AU - Walter, W R AU - Mellors, R J AU - Brunish, W M AU - Bradley, C R AU - Patton, H J AU - Hawkins, W L AU - Corbell, B H AU - Abbott, R E AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S42A EP - 02 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - experimental studies KW - explosions KW - igneous rocks KW - Climax Porphyry KW - granites KW - geophysical methods KW - seismic sources KW - seismic methods KW - Cenozoic KW - Nevada Test Site KW - acoustical methods KW - Tertiary KW - plutonic rocks KW - nuclear explosions KW - Nevada KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549621275?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=An+overview+of+the+source+physics+experiments+%28SPE%29+at+the+Nevada+national+security+site+%28NNSS%29&rft.au=Snelson%2C+C+M%3BBarker%2C+D+L%3BWhite%2C+R+L%3BEmmitt%2C+R+F%3BTownsend%2C+M+J%3BGraves%2C+T+E%3BBecker%2C+S+A%3BTeel%2C+M+G%3BLee%2C+P%3BAntoun%2C+T+H%3BRodgers%2C+A%3BWalter%2C+W+R%3BMellors%2C+R+J%3BBrunish%2C+W+M%3BBradley%2C+C+R%3BPatton%2C+H+J%3BHawkins%2C+W+L%3BCorbell%2C+B+H%3BAbbott%2C+R+E%3BAnonymous&rft.aulast=Snelson&rft.aufirst=C&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - acoustical methods; Cenozoic; Climax Porphyry; experimental studies; explosions; geophysical methods; granites; igneous rocks; Nevada; Nevada Test Site; nuclear explosions; plutonic rocks; seismic methods; seismic sources; Tertiary; United States ER - TY - JOUR T1 - Source physics experiments (SPEs) for test and validation of new explosion source models AN - 1549621272; 2014-056900 AB - The need for effective monitoring of small underground nuclear explosions drives technological advances improving seismic detection capabilities. Such advances rely upon information carried by high-frequency P and S waves recorded at regional distances or closer. Current understanding of S waves excited by explosions lags recent empirical advances, and the resulting gulf between theory and practice undermines the confidence to monitor broad areas where empiricism is deficient. A new generation of explosion source models is needed to predict broadband P and S wave fields with a sound physical basis, thereby increasing the confidence to monitor areas with or without empirical deficiencies. To do so, I believe that source models require a better physical basis for seismic radiation due to damage of the source medium, particularly damage related to shock-wave interactions with the free surface. Spallation is an indicator of damage near the free surface. Following spallation, gravitational unloading, shock-wave rebound, driven block motions, and slapdown induce further damage at greater depths over the shot point. To first order, a vertical dipole moment M (sub zz) serves as a body-force equivalent for such a damage source. In addition to the classical moment due to cavity formation, this source model predicts volumetric moment due to dilation of damaged source media. It also predicts a new, efficient source of P and SV waves in the form of a compensated linear vector dipole which was overlooked by tectonic release models developed in the 70s and 80s. This paper discusses test and validation of new explosion source models drawing upon the results of hydrodynamic simulations and new experimental data provided by SPEs conducted to date on Climax Stock at the Nevada National Security Site (NNSS). JF - American Geophysical Union Fall Meeting AU - Patton, H J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S42A EP - 05 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - body waves KW - monitoring KW - explosions KW - Climax Porphyry KW - geophysical methods KW - elastic waves KW - seismic sources KW - seismic methods KW - Cenozoic KW - Nevada Test Site KW - Tertiary KW - hydrodynamics KW - seismic waves KW - nuclear explosions KW - S-waves KW - Nevada KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549621272?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Source+physics+experiments+%28SPEs%29+for+test+and+validation+of+new+explosion+source+models&rft.au=Patton%2C+H+J%3BAnonymous&rft.aulast=Patton&rft.aufirst=H&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - body waves; Cenozoic; Climax Porphyry; elastic waves; explosions; geophysical methods; hydrodynamics; monitoring; Nevada; Nevada Test Site; nuclear explosions; S-waves; seismic methods; seismic sources; seismic waves; Tertiary; United States ER - TY - JOUR T1 - Large-scale numerical simulation of groundwater flow and solute transport in discretely-fractured crystalline bedrock AN - 1549621262; 2014-056762 AB - A large-scale fluid flow and solute transport model was developed for the crystalline bedrock at Olkiluoto Island, Finland, which is considered as potential deep geological repository for spent nuclear fuel. Site characterization showed that the main flow pathways in the low-permeability crystalline bedrock on the island are 13 subhorizontal fracture zones. Compared to other sites investigated in the context of deep disposal of spent nuclear fuel, most deep boreholes drilled at Olkiluoto are not packed-off but are instead left open. These open boreholes intersect the main fracture zones and create hydraulic connections between them, thus modifying groundwater flow. The combined impact of fracture zones and open boreholes on groundwater flow is simulated at the scale of the island. The modeling approach couples a geomodel that represents the fracture zones and boreholes with a numerical model that simulates fluid flow and solute transport. The geometry of the fracture zones that are intersected by boreholes is complex, and the 3D geomodel was therefore constructed with a tetrahedral mesh. The geomodel was imported into the numerical model to simulate a pumping test conducted on Olkiluoto Island. The pumping test simulation demonstrates that fracture-borehole intersections must be accurately discretized, because they strongly control groundwater flow. The tetrahedral mesh provides an accurate representation of these intersections. The calibrated flow model was then used for illustrative scenarios of radionuclide migration to show the impact of fracture zones on solute transport once the boreholes were backfilled. These mass transport simulations constitute base cases for future predictive analyses and sensitivity studies, since they represent key processes to take into consideration for repository performance assessment. Abstract Copyright (2011) Elsevier, B.V. JF - Advances in Water Resources AU - Blessent, Daniela AU - Therrien, Rene AU - Gable, Carl W Y1 - 2011/12// PY - 2011 DA - December 2011 SP - 1539 EP - 1552 PB - Elsevier, Oxford VL - 34 IS - 12 SN - 0309-1708, 0309-1708 KW - solute transport KW - fractured materials KW - halogens KW - waste disposal sites KW - observation wells KW - coupling KW - Europe KW - calibration KW - simulation KW - Olkiluoto KW - radioactive waste KW - ground water KW - pump tests KW - iodine KW - topography KW - polyhedra KW - Satakunta Finland KW - transport KW - tracers KW - crystalline rocks KW - hydrodynamics KW - discretization KW - discharge KW - bedrock KW - Western Europe KW - numerical models KW - three-dimensional models KW - Finland KW - drainage patterns KW - connectivity KW - tetrahedra KW - Eurajoki Finland KW - flows KW - water table KW - Scandinavia KW - recharge KW - fracture zones KW - hydraulic head KW - boreholes KW - steady-state processes KW - waste disposal KW - underground disposal KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549621262?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Advances+in+Water+Resources&rft.atitle=Large-scale+numerical+simulation+of+groundwater+flow+and+solute+transport+in+discretely-fractured+crystalline+bedrock&rft.au=Blessent%2C+Daniela%3BTherrien%2C+Rene%3BGable%2C+Carl+W&rft.aulast=Blessent&rft.aufirst=Daniela&rft.date=2011-12-01&rft.volume=34&rft.issue=12&rft.spage=1539&rft.isbn=&rft.btitle=&rft.title=Advances+in+Water+Resources&rft.issn=03091708&rft_id=info:doi/10.1016%2Fj.advwatres.2011.09.008 L2 - http://www.sciencedirect.com/science/journal/03091708 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2014-01-01 N1 - Number of references - 42 N1 - Document feature - illus. incl. block diags., 5 tables, sketch map N1 - Last updated - 2014-07-31 N1 - SubjectsTermNotLitGenreText - bedrock; boreholes; calibration; connectivity; coupling; crystalline rocks; discharge; discretization; drainage patterns; Eurajoki Finland; Europe; Finland; flows; fracture zones; fractured materials; ground water; halogens; hydraulic head; hydrodynamics; iodine; numerical models; observation wells; Olkiluoto; polyhedra; pump tests; radioactive waste; recharge; Satakunta Finland; Scandinavia; simulation; solute transport; steady-state processes; tetrahedra; three-dimensional models; topography; tracers; transport; underground disposal; waste disposal; waste disposal sites; water table; Western Europe DO - http://dx.doi.org/10.1016/j.advwatres.2011.09.008 ER - TY - JOUR T1 - Comparison of laboratory and modeling results for high strain rates in support of the source physics experiment AN - 1549620925; 2014-056913 AB - The Source Physics Experiment program, conducted in Climax Stock Granite at the Nevada Test Site, will provide ground truth data to create and improve strong ground motion and seismic S-wave generation and propagation models. Modeling using advanced simulation codes will be performed both a priori and after each experiment; a key component in the predictive capability and ultimate validation of the models is the full understanding of the intervening geology between the source and instrumented bore holes including the geomechanical behavior of the site rock/structural features. Mechanical properties determined via laboratory testing of site rocks leads to the parameterization of constitutive models used in the simulations. The combined finite-discrete element method by Munjiza is an excellent tool to address a wide range of problems involving fracturing and fragmentation of solids and has been applied to many complex rock mechanics problems such as block caving, deep mining techniques, rock blasting, and seismic wave propagation. Since most of the problems involving fracture and fragmentation of solids are three dimensional, an improved 2D/3D FEM/DEM capability has been developed at Los Alamos National Laboratory. In this paper, Split Hopkinson Pressure Bar experiments, performed on the Climax Stock Granite by Sandia National Laboratories, are simulated using this improved 2D/3D FEM/DEM approach, implemented on LANL's MUNROU (Munjiza-Rougier) code and show excellent agreement. JF - American Geophysical Union Fall Meeting AU - Sussman, A AU - Rougier, E AU - Broome, S AU - Knight, E AU - Pfeifle, T AU - Schultz-Fellenz, E S AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S43A EP - 2211 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - discrete element analysis KW - body waves KW - experimental studies KW - igneous rocks KW - Climax Porphyry KW - granites KW - geophysical methods KW - elastic waves KW - seismic sources KW - seismic methods KW - models KW - Cenozoic KW - Nevada Test Site KW - laboratory studies KW - finite element analysis KW - Tertiary KW - plutonic rocks KW - ground truth KW - seismic waves KW - S-waves KW - Nevada KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620925?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Comparison+of+laboratory+and+modeling+results+for+high+strain+rates+in+support+of+the+source+physics+experiment&rft.au=Sussman%2C+A%3BRougier%2C+E%3BBroome%2C+S%3BKnight%2C+E%3BPfeifle%2C+T%3BSchultz-Fellenz%2C+E+S%3BAnonymous&rft.aulast=Sussman&rft.aufirst=A&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - body waves; Cenozoic; Climax Porphyry; discrete element analysis; elastic waves; experimental studies; finite element analysis; geophysical methods; granites; ground truth; igneous rocks; laboratory studies; models; Nevada; Nevada Test Site; plutonic rocks; S-waves; seismic methods; seismic sources; seismic waves; Tertiary; United States ER - TY - JOUR T1 - Validating seismic imaging methods and 3D seismic velocity models AN - 1549620038; 2014-056852 AB - Since the beginning of tomography studies in the 1970s, geoscientists have mastered the art of inferring an image of the underground solid Earth from a collection of observables recorded at the surface. In particular and for the last decade, several research institutions have been focusing on addressing the Earth's 3D heterogeneities and complexities. While the best current inversion techniques are providing 3D seismic structure models with the best resolution ever, they do not provide any absolute assessment of the model uncertainty. Model validation is typically limited to resolution tests that assume the imaging theory used is accurate and thus only considers the impact of the data coverage on resolution. We present the results of a more rigorous approach to model validation based on the systematic comparison of synthetic seismograms to real data. Synthetic seismograms are computed via full three-dimensional waveform propagation using Spectral Element Methods (SEM). This approach makes no assumptions about the theory used to generate the models but require substantial computational resources. We first focus on validating 3D tomographic models for the Western USA generated using both ray-theoretical and finite-frequency methods. In this manner we do not validate just the model but also the imaging technique. We are investigating the performance of the models using different measurement techniques for different parts of the signal contained in the synthetic seismograms. Preliminary results for this model and a moderate-size event on the Pacific Northwest show no perceptible difference in performance between models obtained with the two different imaging techniques (finite-frequency ray-theoretical) at intermediate periods. Differences start to appear, however, at higher frequencies. Implementation of the method for a densely instrumented region such as that covered by the Dynamic North America models provides a useful testbed for the validation methods that we will subsequently apply to other study areas. JF - American Geophysical Union Fall Meeting AU - Maceira, M AU - Larmat, C S AU - Rowe, C A AU - Allen, R M AU - Obrebski, M J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S41A EP - 2182 PB - American Geophysical Union, Washington, DC VL - 2011 KW - tomography KW - models KW - imagery KW - three-dimensional models KW - geophysical methods KW - data processing KW - velocity KW - waveforms KW - uncertainty KW - seismic methods KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620038?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Validating+seismic+imaging+methods+and+3D+seismic+velocity+models&rft.au=Maceira%2C+M%3BLarmat%2C+C+S%3BRowe%2C+C+A%3BAllen%2C+R+M%3BObrebski%2C+M+J%3BAnonymous&rft.aulast=Maceira&rft.aufirst=M&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - data processing; geophysical methods; imagery; models; seismic methods; three-dimensional models; tomography; uncertainty; velocity; waveforms ER - TY - JOUR T1 - SALSA3D; improving event locations using a global 3D P-velocity model of the Earth's crust and mantle AN - 1549620014; 2014-056891 AB - To test the hypothesis that high quality 3D Earth models will produce seismic event locations that are more accurate and more precise than currently used 1D and 2/2.5D models, we are developing a global 3D P wave velocity model of the Earth's crust and mantle using seismic tomography. In this paper, we present the most recent version of our model, SALSA3D (SAndia LoS Alamos 3D) version 1.7, and demonstrate its ability to reduce mislocations for a large set of realizations derived from a carefully chosen set of globally-distributed ground truth (GT) events, compared to existing models and/or systems. Our model is derived from the latest version of the GT catalog of P and Pn travel time picks assembled by Los Alamos National Laboratory. To prevent over-weighting due to ray path redundancy and to reduce the computational burden, we cluster rays to produce representative rays. Reduction in the total number of ray paths is approximately 50%. The model is represented using the triangular tessellation system described by Ballard et al. (2009), which incorporates variable resolution in both the geographic and radial dimensions. For our starting model, we use a simplified layer crustal model derived from the NNSA Unified model in Eurasia and Crust 2.0 model elsewhere, over a uniform ak135 mantle. Sufficient damping is used to reduce velocity adjustments so that ray path changes between iterations are small. We obtain proper model smoothness by using progressive grid refinement, refining the grid only in areas where the data warrant it. In previous versions of SALSA3D, we based this refinement on velocity changes from previous model iterations. For version 1.7, we utilize the diagonal of the model resolution matrix to control where grid refinement occurs, resulting in more consistent and continuous areas of refinement than before. Our approach produces a smooth, multi-resolution model with node density appropriate to both ray coverage and the velocity gradients required by the data. We compare the travel-time prediction and location capabilities of SALSA3D to standard 1D and 2/2.5D models via location tests on a global event set with GT of 5 km or better. These events generally possess hundreds of Pn and P picks from which we generate different realizations of station distributions, yielding a range of azimuthal coverage and ratios of teleseismic to regional arrivals, with which we test the robustness and quality of relocation. The SALSA3D model reduces mislocation over the standard 1D ak135 model regardless of Pn to P ratio, with improvement most pronounced at higher azimuthal gaps. We currently are testing the use of the full model covariance matrix to produce realistic path-dependent travel time uncertainty during location tests, replacing the standard, distance-dependent, path-independent uncertainty typically used in location algorithms. JF - American Geophysical Union Fall Meeting AU - Begnaud, M L AU - Ballard, S AU - Young, C J AU - Hipp, J R AU - Chang, M AU - Encarnacao, A AU - Rowe, C A AU - Phillips, W S AU - Steck, L AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract S41E EP - 04 PB - American Geophysical Union, Washington, DC VL - 2011 KW - tomography KW - P-waves KW - body waves KW - three-dimensional models KW - geophysical methods KW - mantle KW - elastic waves KW - seismic methods KW - models KW - velocity KW - seismic waves KW - crust KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620014?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=SALSA3D%3B+improving+event+locations+using+a+global+3D+P-velocity+model+of+the+Earth%27s+crust+and+mantle&rft.au=Begnaud%2C+M+L%3BBallard%2C+S%3BYoung%2C+C+J%3BHipp%2C+J+R%3BChang%2C+M%3BEncarnacao%2C+A%3BRowe%2C+C+A%3BPhillips%2C+W+S%3BSteck%2C+L%3BAnonymous&rft.aulast=Begnaud&rft.aufirst=M&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - body waves; crust; elastic waves; geophysical methods; mantle; models; P-waves; seismic methods; seismic waves; three-dimensional models; tomography; velocity ER - TY - JOUR T1 - Rock-magnetic method for post nuclear detonation diagnostics AN - 1432096937; 638208-36 AB - A magnetic signature characteristic of a Nuclear Electromagnetic Pulse (NEMP) may still be detectable near the sites of atmospheric nuclear tests conducted at what is now the Nevada National Security Site. This signature is due to a secondary magnetization component of the natural remanent magnetization of material containing traces of ferromagnetic particles that have been exposed to a strong pulse of magnetic field. We apply a rock-magnetic method introduced by Verrier et al. (2002), and tested on samples exposed to artificial lightning, to samples of rock and building materials (e.g. bricks, concrete) retrieved from several above ground nuclear test sites. The results of magnetization measurements are compared to NEMP simulations and historic test measurements. JF - American Geophysical Union Fall Meeting AU - Englert, J AU - Petrosky, J AU - Bailey, W AU - Watts, D R AU - Tauxe, L AU - Heger, A S AU - ? Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract GP11A EP - 0988 PB - American Geophysical Union, Washington, DC VL - 2011 KW - areal geology KW - 13:Areal geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1432096937?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Rock-magnetic+method+for+post+nuclear+detonation+diagnostics&rft.au=Englert%2C+J%3BPetrosky%2C+J%3BBailey%2C+W%3BWatts%2C+D+R%3BTauxe%2C+L%3BHeger%2C+A+S%3B%3F&rft.aulast=Englert&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - PubXState - DC N1 - Last updated - 2017-01-24 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - areal geology ER - TY - JOUR T1 - A lower bound for sea level rise from glaciers and ice caps AN - 1080609940; 2012-085453 AB - Most glaciers and ice caps (GIC) are out of balance with the current climate. In order to return to equilibrium, these GIC must retreat to higher elevations, losing mass and raising sea level. The required mass losses can be derived from the accumulation-area ratio (AAR), the fractional glacier area where accumulation exceeds ablation. Here, we present an updated data set for 142 GIC from 1970-2009 and show that most glaciers and ice caps are farther from balance than previously believed. For the first decade of the 21st century (2000-2009), GIC in this data set have a mean AAR of 35%, far below the mean equilibrium value of 56%. Assuming that these AARs are representative, the Earth's glaciers and ice caps must lose about 40% of their volume, raising mean sea level by about 240 mm, to be in balance with the climate of the past decade. Extrapolation of recent trends suggests that if climate change continues unabated for the next two to three decades, the Earth's GIC will eventually lose more than 75% of their volume. JF - American Geophysical Union Fall Meeting AU - Lipscomb, W H AU - Mernild, S H AU - Bahr, D AU - Zemp, M AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract C53C EP - 0693 PB - American Geophysical Union, Washington, DC VL - 2011 KW - sea-level changes KW - mass balance KW - climate effects KW - glaciers KW - ice shelves KW - glacial geology KW - ice sheets KW - deglaciation KW - climate change KW - ice caps KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080609940?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+lower+bound+for+sea+level+rise+from+glaciers+and+ice+caps&rft.au=Lipscomb%2C+W+H%3BMernild%2C+S+H%3BBahr%2C+D%3BZemp%2C+M%3BAnonymous&rft.aulast=Lipscomb&rft.aufirst=W&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://www.agu.org/cgi-bin/SFgate/SFgate?language=English&verbose=0&listenv=table&application=fm11&convert=&converthl=&refinequery=&formintern=&formextern=&transquery=an%3dc53c&_lines=&multiple=0&descriptor=%2fdata%2fepubs%2fwais%2findexes%2ffm11%2ffm11%7c1000%7c2621%7cA%20Lower%20Bound%20for%20Sea%20Level%20Rise%20from%20Glaciers%20and%20Ice%20Caps%7cHTML%7clocalhost:0%7c%2fdata%2fepubs%2fwais%2findexes%2ffm11%2ffm11%7c16945923%2016948544%20%2fdata2%2fepubs%2fwais%2fdata%2ffm11%2ffm11.txt LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2012-09-27 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - climate change; climate effects; deglaciation; glacial geology; glaciers; ice caps; ice sheets; ice shelves; mass balance; sea-level changes ER - TY - JOUR T1 - High-resolution, parallel, continental ice sheet modelling using nonlinearly consistent solution algorithms AN - 1020540115; 2012-056430 AB - A parallel capability and Jacobian-Free Newton-Krylov solution method has been implemented into the higher-order velocity dynamical core within the Community Ice Sheet Model (CISM), a three dimensional, thermomechanical, continental scale ice sheet model coupled to the Community Earth System Model (CESM). Using these new capabilities, we present an analysis of the accuracy, convergence behavior, and efficiency gains for several standard test cases as well as for high-resolution Greenland simulations. Progress toward high-resolution simulations using the parallel CISM within the CESM will be discussed, including an outline of existing and future algorithmic and logistical challenges. JF - American Geophysical Union Fall Meeting AU - Evans, K J AU - Price, S F AU - Salinger, A G AU - Worley, P H AU - Nichols, J A AU - Norman, M AU - Lipscomb, W H AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract DI14A EP - 06 PB - American Geophysical Union, Washington, DC VL - 2011 KW - models KW - Greenland KW - three-dimensional models KW - ice KW - Arctic region KW - Greenland ice sheet KW - ice cover KW - thermomechanical properties KW - glacial geology KW - algorithms KW - ice sheets KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1020540115?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=High-resolution%2C+parallel%2C+continental+ice+sheet+modelling+using+nonlinearly+consistent+solution+algorithms&rft.au=Evans%2C+K+J%3BPrice%2C+S+F%3BSalinger%2C+A+G%3BWorley%2C+P+H%3BNichols%2C+J+A%3BNorman%2C+M%3BLipscomb%2C+W+H%3BAnonymous&rft.aulast=Evans&rft.aufirst=K&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2014-09-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - algorithms; Arctic region; glacial geology; Greenland; Greenland ice sheet; ice; ice cover; ice sheets; models; thermomechanical properties; three-dimensional models ER - TY - JOUR T1 - The gap between ice-penetrating radar observations and the boundary conditions used in ice-sheet models AN - 1020539831; 2012-056328 AB - Modern, ice-sheet-wide ice-penetrating-radar surveys are now underway (e.g., IceBridge, ICECAP), but beyond ice thickness, how can ice-sheet models make use of these new data? Ice-sheet models employ data-constrained gridded models of bed properties relevant to ice dynamics, but heretofore such grids have included only elevation (i.e., ice thickness), geothermal flux, and the location of subglacial lakes. Here we evaluate the gap between radar observations and the boundary conditions presently used in ice-sheet models. Radar can detect large bodies of subglacial water, but distinguishing between thawed and frozen beds from bed echoes alone remains challenging, partly because of the strong temperature dependence of englacial radar attenuation. However, frozen and thawed beds have been successfully delineated from radar data in Greenland using additional information from internal layer morphology. Changes in the surface and ice-flow character observed from satellite imagery can also delineate regions of possible basal sliding, further narrowing the frozen/thawed transition. Internal layer morphology could also be used as a target for ice-sheet models seeking to accurately represent the ice-flow history of modern ice sheets. In addition, recent studies have shown that bed roughness in Antarctica is anisotropic, spatially varying, and related to large-scale ice dynamics. Bed roughness can be measured from the detrended bed topography and can be simply related to basal drag; it typically follows a power-law relationship at horizontal scales between approximately 10 to 500 m, so it may not be necessary to finely sample bed roughness in order to usefully relate it to basal drag. Finally, distinguishing between bedrock and deformable subglacial till is also possible, when radar data is used in combination with other geophysical data (seismics, gravity). We suggest that efforts involving the synthesis of radar data (both internal and bed echoes), together with satellite remote-sensing data, simple ice-flow models and other geophysical data, provide the clearest path forward for producing additional boundary conditions of value to ice-sheet models. Initial candidates for such boundary conditions include the delineation of the frozen/thawed bed transition, gridded layer morphology, and bed roughness. JF - American Geophysical Union Fall Meeting AU - MacGregor, Joe A AU - Catania, G A AU - Fahnestock, Mark A AU - Price, S F AU - Paden, J D AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract C11C EP - 0681 PB - American Geophysical Union, Washington, DC VL - 2011 KW - hydrology KW - subglacial processes KW - Arctic region KW - lakes KW - Greenland ice sheet KW - radar methods KW - glaciers KW - satellite methods KW - physical models KW - ice sheets KW - boundary conditions KW - Greenland KW - glacial geology KW - ice-penetrating radar KW - subglacial lakes KW - remote sensing KW - meltwater KW - 24:Quaternary geology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1020539831?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+gap+between+ice-penetrating+radar+observations+and+the+boundary+conditions+used+in+ice-sheet+models&rft.au=MacGregor%2C+Joe+A%3BCatania%2C+G+A%3BFahnestock%2C+Mark+A%3BPrice%2C+S+F%3BPaden%2C+J+D%3BAnonymous&rft.aulast=MacGregor&rft.aufirst=Joe&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://www.agu.org/cgi-bin/SFgate/SFgate?language=English&verbose=0&listenv=table&application=fm11&convert=&converthl=&refinequery=&formintern=&formextern=&transquery=an%3dc11c&_lines=&multiple=0&descriptor=%2fdata%2fepubs%2fwais%2findexes%2ffm11%2ffm11%7c1000%7c4279%7cThe%20gap%20between%20ice-penetrating%20radar%20observations%20and%20the%20boundary%20conditions%20used%20in%20ice-sheet%20models%7cHTML%7clocalhost:0%7c%2fdata%2fepubs%2fwais%2findexes%2ffm11%2ffm11%7c14421396%2014425675%20%2fdata2%2fepubs%2fwais%2fdata%2ffm11%2ffm11.txt LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2012-06-15 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Arctic region; boundary conditions; glacial geology; glaciers; Greenland; Greenland ice sheet; hydrology; ice sheets; ice-penetrating radar; lakes; meltwater; physical models; radar methods; remote sensing; satellite methods; subglacial lakes; subglacial processes ER - TY - JOUR T1 - Stress state and bending dissipation in subducting lithosphere AN - 1020537823; 2012-056392 AB - Deformation in subducting oceanic lithosphere can be represented by a composite rheology. Departures from purely elastic behavior occur through brittle failure in the shallow portion of the plate and by a combination of low- and high-temperature creep at greater depths. We use experimentally-based rheological models to construct estimates for the stress state, dissipation and dynamics of subducted lithosphere. Brittle failure in tension during bending is calculated using Byerlee's Law. Stress in the creeping portion of the plate depends on strain-rate, which is computed with the usual kinematic approximations for thin plates (i.e. Kirchoff approximations). Starting with an initial estimate for the mid-plane location, we iteratively adjust the mid-plane until the maximum brittle and ductile stresses match. The mechanical thickness of the plate, defined as twice the final mid-plate depth, is typically 60% of the thermal thickness. Integrated quantities, like the stress moment, are insensitive to changes in plate curvature or the rate of subduction. In fact, we can approximate the stress moment and bending dissipation using a simple power-law rheology. Such a large exponent implies that the plate behaves like a perfectly plastic solid. The stress moment saturates along most of the subducting slab and only contributes to the force balance at the transition between bending and unbending. Elsewhere we expect normal and shear stresses on the surface of the slab to balance buoyancy forces through the evolution of curvature. Applying our estimates to a recent compilation of slab curvature at major subduction zones, we conclude that bending dissipation in slabs is unlikely to exceed 20% of the buoyancy flux of slabs sinking through the upper mantle. JF - American Geophysical Union Fall Meeting AU - Lewis, Kayla C AU - Buffett, B A AU - Bailey, I W AU - Becker, T W AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract DI11A EP - 2134 PB - American Geophysical Union, Washington, DC VL - 2011 KW - oceanic crust KW - plates KW - plate tectonics KW - rheology KW - lithosphere KW - movement KW - stress KW - oceanic lithosphere KW - subduction KW - bending KW - crust KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1020537823?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Stress+state+and+bending+dissipation+in+subducting+lithosphere&rft.au=Lewis%2C+Kayla+C%3BBuffett%2C+B+A%3BBailey%2C+I+W%3BBecker%2C+T+W%3BAnonymous&rft.aulast=Lewis&rft.aufirst=Kayla&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://www.agu.org/cgi-bin/SFgate/SFgate?language=English&verbose=0&listenv=table&application=fm11&convert=&converthl=&refinequery=&formintern=&formextern=&transquery=an%3ddi11a&_lines=&multiple=0&descriptor=%2fdata%2fepubs%2fwais%2findexes%2ffm11%2ffm11%7c1000%7c3523%7cStress%20State%20and%20Bending%20Dissipation%20in%20Subducting%20Lithosphere%7cHTML%7clocalhost:0%7c%2fdata%2fepubs%2fwais%2findexes%2ffm11%2ffm11%7c17231873%2017235396%20%2fdata2%2fepubs%2fwais%2fdata%2ffm11%2ffm11.txt LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2012-06-15 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - bending; crust; lithosphere; movement; oceanic crust; oceanic lithosphere; plate tectonics; plates; rheology; stress; subduction ER - TY - JOUR T1 - Transient modeling of permafrost dynamics in a changing climate AN - 1020537808; 2012-056364 AB - Analysis of permafrost dynamics is conducted with a recently developed numerical model which is capable of handling a three-phase, two-component flow system coupled to heat transport. This approach enables a thorough physically-based description of permafrost flow dynamics. It can further utilize classical water-retention curves for unsaturated media under non-freezing conditions, which have been complied for many soil types and are readily available in the literature Here we consider simulation configurations representing small-scale subsurface domains with various soil textures relevant for high-latitude arctic and subarctic discontinuous permafrost environments. These are evaluated in terms of how they exhibit control on the formation and development of permafrost, together with dynamics of water flow and transients in groundwater discharge, subject to both seasonal temperature variability and warming climate scenarios. Previous results have indicated a reduction in temporal variability of groundwater flow for a moderate temperature trend over a long time period of warming. Recent results indicate similar behavior also for larger rates-of-change, i.e., faster temperature increases over shorter time periods. This implies that greater warming trends yield relatively fast changes in annual flow variability, which may serve as early indicators for permafrost degradation rather than solely relying on long-term changes in mean flows. This is advantageous to performing multiple direct in-situ--and often costly--local measurements of permafrost degradation, since detection of changes in hydrological signals is easier to establish, and hydrological time series exist for relatively long time periods and encompass integrated catchment scale behavior. JF - American Geophysical Union Fall Meeting AU - Frampton, Andrew AU - Painter, S AU - Lyon, Steve W AU - Sjoberg, Ylva AU - Destouni, Georgia AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract C53G EP - 02 PB - American Geophysical Union, Washington, DC VL - 2011 KW - transient methods KW - soils KW - hydrology KW - permafrost KW - degradation KW - numerical models KW - subarctic regions KW - energy balance KW - climate change KW - temperature KW - ground water KW - climate effects KW - hydrodynamics KW - seasonal variations KW - discharge KW - 21:Hydrogeology KW - 25:Soils UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1020537808?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Transient+modeling+of+permafrost+dynamics+in+a+changing+climate&rft.au=Frampton%2C+Andrew%3BPainter%2C+S%3BLyon%2C+Steve+W%3BSjoberg%2C+Ylva%3BDestouni%2C+Georgia%3BAnonymous&rft.aulast=Frampton&rft.aufirst=Andrew&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2014-09-18 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - climate change; climate effects; degradation; discharge; energy balance; ground water; hydrodynamics; hydrology; numerical models; permafrost; seasonal variations; soils; subarctic regions; temperature; transient methods ER - TY - JOUR T1 - Mass balance and volume observations from Greenland's longest-observed local glacier, Mittivakkat Gletscher AN - 1015459794; 2012-047490 AB - Glaciers and ice caps are indicators of ongoing climate changes. Warming in the Arctic during the past several decades has caused local glaciers and ice caps to thin and retreat. Few mass-balance observations are available in Greenland to quantify the retreat and determine the extent to which these glaciers and ice caps are out of equilibrium with present-day climate. Here, we document mass balance records since 1995 and volume observations for the Mittivakkat Gletscher (17.6 km (super 2) ; 65 degrees 41N, 37 degrees 48W), Southeast Greenland, the only local glacier in Greenland for which there exists long-term observations of both surface mass balance and glacier front fluctuations. Front observations were first made in 1931, taken by the British Arctic Air Route Expedition, 1930-1931. Since 1995, mean values of observed winter, summer and net balance were 1.18, -1.94, and -0.87 m w.e., respectively. The measurements showed that 13 out of 15 balance years had a negative balance, and two balance years had a slightly positive balance. The cumulative mass balance since 1995 was -13.0 m w.e., corresponding to a mass loss of about 11% of the total glacier ice volume determined in 1994. Here, we use the observed mass-balance record to estimate present-day and equilibrium accumulation-area ratios for the Mittivakkat Gletscher. We show that the glacier is significantly out of balance and will likely lose approximately 70% of its current area and 80% of its volume even in the absence of further climate changes. JF - American Geophysical Union Fall Meeting AU - Yde, Jacob C AU - Mernild, S H AU - Knudsen, N T AU - Hasholt, B AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract C21C EP - 03 PB - American Geophysical Union, Washington, DC VL - 2011 KW - Arctic region KW - ice cover KW - glaciers KW - deglaciation KW - climate change KW - ice caps KW - Greenland KW - Mittivakkat Glacier KW - mass balance KW - ice KW - climate effects KW - glacial geology KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1015459794?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Mass+balance+and+volume+observations+from+Greenland%27s+longest-observed+local+glacier%2C+Mittivakkat+Gletscher&rft.au=Yde%2C+Jacob+C%3BMernild%2C+S+H%3BKnudsen%2C+N+T%3BHasholt%2C+B%3BAnonymous&rft.aulast=Yde&rft.aufirst=Jacob&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://www.agu.org/cgi-bin/SFgate/SFgate?language=English&verbose=0&listenv=table&application=fm11&convert=&converthl=&refinequery=&formintern=&formextern=&transquery=an%3dc21c&_lines=&multiple=0&descriptor=%2fdata%2fepubs%2fwais%2findexes%2ffm11%2ffm11%7c1000%7c3280%7cMass%20balance%20and%20volume%20observations%20from%20Greenland%26%238217%3bs%20longest-observed%20local%20glacier%2c%20Mittivakkat%20Gletscher%7cHTML%7clocalhost:0%7c%2fdata%2fepubs%2fwais%2findexes%2ffm11%2ffm11%7c14869556%2014872836%20%2fdata2%2fepubs%2fwais%2fdata%2ffm11%2ffm11.txt LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2012-06-07 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Arctic region; climate change; climate effects; deglaciation; glacial geology; glaciers; Greenland; ice; ice caps; ice cover; mass balance; Mittivakkat Glacier ER - TY - JOUR T1 - Slow dynamics of Earth materials; an experimental overview AN - 1008853772; 636083-7 AB - In 1996 Johnson et al. were the first to identify peculiar rate effects in resonant bar experiments on various earth materials. The effects were evident on time scales of minutes to hours. They were also seen in both sedimentary and crystalline rocks, and have since been seen in geomaterials like concrete. Although these effects resemble some aspects of creep and creep recovery, they can be induced by a sinusoidal acoustic drive at strains three orders of magnitude below typical creep experiments. These strains are only a few tenths of a microstrain. Moreover, unlike most creep behavior, the effects have been shown to be macroscopically reversible and repeatable, over hundreds of experiments spanning nearly a year. The unique excitation and character of these rate effects cause them to be called slow dynamics. A review and discussion of slow dynamics is presented, pointing out similarities and differences with ordinary creep and focusing on laboratory experiments. A brief description of some possible mechanisms is included, and a new experiment on a sample of Berea sandstone in ultra high vacuum is shown to point out new research that hopes to help ascertain the role of water as a potential mechanism. Copyright 2011 Springer Basel AG and Springer Basel AG (outside the USA) JF - Pure and Applied Geophysics AU - TenCate, James A Y1 - 2011/12// PY - 2011 DA - December 2011 SP - 2211 EP - 2219 PB - Birkhaeuser Verlag, Basel VL - 168 IS - 12 SN - 0033-4553, 0033-4553 KW - Fontainebleau Sandstone KW - Lavoux Limestone KW - experimental studies KW - strain KW - Paleozoic KW - stress KW - Berea Sandstone KW - slow dyanmics KW - Paleogene KW - concrete KW - rock mechanics KW - Cenozoic KW - laboratory studies KW - Tertiary KW - resonance KW - sedimentary rocks KW - creep KW - crystalline rocks KW - construction materials KW - Oligocene KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1008853772?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Pure+and+Applied+Geophysics&rft.atitle=Slow+dynamics+of+Earth+materials%3B+an+experimental+overview&rft.au=TenCate%2C+James+A&rft.aulast=TenCate&rft.aufirst=James&rft.date=2011-12-01&rft.volume=168&rft.issue=12&rft.spage=2211&rft.isbn=&rft.btitle=&rft.title=Pure+and+Applied+Geophysics&rft.issn=00334553&rft_id=info:doi/10.1007%2Fs00024-011-0268-4 L2 - http://link.springer.de/link/service/journals/00024/index.htm LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2012, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Number of references - 38 N1 - Document feature - illus. N1 - Last updated - 2012-07-20 N1 - CODEN - PAGYAV N1 - SubjectsTermNotLitGenreText - Berea Sandstone; Cenozoic; concrete; construction materials; creep; crystalline rocks; experimental studies; Fontainebleau Sandstone; laboratory studies; Lavoux Limestone; Oligocene; Paleogene; Paleozoic; resonance; rock mechanics; sedimentary rocks; slow dyanmics; strain; stress; Tertiary DO - http://dx.doi.org/10.1007/s00024-011-0268-4 ER - TY - JOUR T1 - The role of advective heat transport in talik development beneath lakes and ponds in discontinuous permafrost AN - 1008820070; 2012-039890 AB - To date, models of talik (perennially unfrozen ground) development beneath lakes and ponds in permafrost terrain have focused on simulations with continuous, thick (> or =400 m), cold ( or =-2 degrees C) suggest that a through-going sub-lake talik may develop in a matter of decades. We modeled the development of a sub-lake talik under permafrost conditions similar to that observed in the southern Seward Peninsula region of Alaska using the Arctic Hydrology Model (ARCHY). ARCHY is a numerical solution that couples heat transport and groundwater flow including the effect of water phase changes on soil permeability and latent heat content. A comparison of model simulations, with and without near surface subpermafrost groundwater flow, indicate that stable permafrost thicknesses are 2 to 5 times greater in the absence of groundwater flow. Simulations examining the thermal influence of lakes on underlying permafrost suggest that through-going talik can develop in a matter of decades and that the incorporation of advective heat transport reduces the time to complete loss of ice beneath the lake by half, relative to heat transport by conduction alone. This work presents the first quantitative assessment of the rates of sub-lake permafrost loss in a system with near-surface groundwater flow. The results highlight the importance of coupled thermal and hydrologic processes on discontinuous permafrost dynamics. JF - American Geophysical Union Fall Meeting AU - Rowland, J C AU - Travis, B J AU - Wilson, C J AU - Anonymous Y1 - 2011/12// PY - 2011 DA - December 2011 SP - Abstract C51B EP - 01 PB - American Geophysical Union, Washington, DC VL - 2011 KW - United States KW - hydrology KW - permafrost KW - Seward Peninsula KW - numerical models KW - Arctic region KW - energy balance KW - temperature KW - ground water KW - hydrodynamics KW - Alaska KW - active layer KW - taliks KW - 25:Soils UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1008820070?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+role+of+advective+heat+transport+in+talik+development+beneath+lakes+and+ponds+in+discontinuous+permafrost&rft.au=Rowland%2C+J+C%3BTravis%2C+B+J%3BWilson%2C+C+J%3BAnonymous&rft.aulast=Rowland&rft.aufirst=J&rft.date=2011-12-01&rft.volume=2011&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2011 fall meeting N1 - Copyright - GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - PubXState - DC N1 - Last updated - 2017-01-19 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - active layer; Alaska; Arctic region; energy balance; ground water; hydrodynamics; hydrology; numerical models; permafrost; Seward Peninsula; taliks; temperature; United States ER - TY - JOUR T1 - Tomography of crustal P and S travel times across the western United States AN - 1520930644; 16044754 AB - Tomography of secondary crustal phases yields robust velocity structure Velocity structure is consistent with previous studies at 10-15 km depth Analysis suggests upper crustal wave propagation for Pg and Sg Data from the USArray combined with local, regional, and national networks provide an unprecedented opportunity for imaging the crust of the western United States. We employ a simple tomography scheme to invert Pg and Sg travel times for velocity structure. The approach is analogous to Pn tomography: we assume a great circle arc between source and receiver and solve for station and event terms along with 2-D velocity structure. Pg velocities are high in the Snake River Plain, western Washington and the Columbia Plateau, and in central California. The Colorado Plateau falls midrange while the Basin and Range is slow, as are the Geysers region north of the San Francisco Bay and the Salton Trough. For Sg, the Snake River plain is fast, as is the entire Cordillera from the Southern Sierra Nevada up through the Cascades. Both the Colorado Plateau and most of the Rocky Mountains are also fast. At the highest point of the Rocky Mountains, the Aspen Anomaly is a low-velocity region. The Basin and Range is a composite of slower to the west abutting the Sierra Nevada and faster in eastern Nevada. Coastal California is slow, with the exception of the San Francisco Bay region and far northern California. The continental crust of the North American craton appears slightly fast for both Pg and Sg. Our observations and their trends compare well with middle to upper crustal velocity estimates from previous studies. They also compare reasonably well with average crustal velocities from the same studies. JF - Journal of Geophysical Research. Solid Earth AU - Steck, Lee K AU - Begnaud, Michael L AU - Phillips, Scott AU - Stead, Richard AD - Los Alamos National Laboratory, Los Alamos, New Mexico, USA Y1 - 2011/11/11/ PY - 2011 DA - 2011 Nov 11 PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 116 IS - B11 SN - 2169-9313, 2169-9313 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - 7203 Seismology: Body waves KW - 7205 Seismology: Continental crust KW - 7230 Seismology: Seismicity and tectonics KW - 7270 Seismology: Tomography KW - body waves KW - crustal structure KW - tomography KW - Continental crust KW - Geysers KW - Hot springs KW - North America, Rocky Mts. KW - Mountains KW - Wave Propagation KW - Networks KW - Cratons KW - Rivers KW - Marine KW - Oceanic crust KW - Seismic layers KW - Velocity KW - Solids KW - Traveltime KW - Wave propagation KW - Imaging techniques KW - SW 5010:Network design KW - Q2 09266:Tectonics and crustal structure KW - AQ 00006:Sewage UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1520930644?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research.+Solid+Earth&rft.atitle=Tomography+of+crustal+P+and+S+travel+times+across+the+western+United+States&rft.au=Steck%2C+Lee+K%3BBegnaud%2C+Michael+L%3BPhillips%2C+Scott%3BStead%2C+Richard&rft.aulast=Steck&rft.aufirst=Lee&rft.date=2011-11-11&rft.volume=116&rft.issue=B11&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research.+Solid+Earth&rft.issn=21699313&rft_id=info:doi/10.1029%2F2011JB008260 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-12-01 N1 - Number of references - 35 N1 - Last updated - 2016-09-29 N1 - SubjectsTermNotLitGenreText - Oceanic crust; Continental crust; Seismic layers; Hot springs; Wave propagation; Cratons; Imaging techniques; Wave Propagation; Mountains; Rivers; Networks; Geysers; Velocity; Solids; Traveltime; North America, Rocky Mts.; Marine DO - http://dx.doi.org/10.1029/2011JB008260 ER - TY - CPAPER T1 - Modelling Shear Localization under Dynamic Loading Conditions T2 - 2011 ASME International Mechanical Engineering Congress & Exposition (ASME 2011) AN - 1313059408; 6113570 JF - 2011 ASME International Mechanical Engineering Congress & Exposition (ASME 2011) AU - Luscher, D Y1 - 2011/11/11/ PY - 2011 DA - 2011 Nov 11 KW - Mechanical loading UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313059408?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2011+ASME+International+Mechanical+Engineering+Congress+%26+Exposition+%28ASME+2011%29&rft.atitle=Modelling+Shear+Localization+under+Dynamic+Loading+Conditions&rft.au=Luscher%2C+D&rft.aulast=Luscher&rft.aufirst=D&rft.date=2011-11-11&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2011+ASME+International+Mechanical+Engineering+Congress+%26+Exposition+%28ASME+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://www.asmeconferences.org/Congress2011/TechnicalProgramOverview.cfm LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Scale-dependent deformation of lamellar metallic nanocomposites T2 - 2011 ASME International Mechanical Engineering Congress & Exposition (ASME 2011) AN - 1312984788; 6113567 JF - 2011 ASME International Mechanical Engineering Congress & Exposition (ASME 2011) AU - Mayeur, Jason Y1 - 2011/11/11/ PY - 2011 DA - 2011 Nov 11 KW - Deformation KW - Nanocomposites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312984788?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2011+ASME+International+Mechanical+Engineering+Congress+%26+Exposition+%28ASME+2011%29&rft.atitle=Scale-dependent+deformation+of+lamellar+metallic+nanocomposites&rft.au=Mayeur%2C+Jason&rft.aulast=Mayeur&rft.aufirst=Jason&rft.date=2011-11-11&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2011+ASME+International+Mechanical+Engineering+Congress+%26+Exposition+%28ASME+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://www.asmeconferences.org/Congress2011/TechnicalProgramOverview.cfm LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Properties of Helium bubbles in Fe and FeCr alloys AN - 918066348; 16068214 AB - We investigate three aspects of He that are relevant for its behavior in FeCr alloys. (i) the EOS of pure He, as an auxiliary element to relate pressure and density inside a bubble; (ii) He bubbles in FeCr alloys, to explore the influence of Cr as solute and at Delta *a' precipitates on the He precipitation behavior; (iii) the growth mechanism of a He bubble in Fe and Fe 15 at% Cr under the particular conditions of a He-rich and vacancy poor environment. This last case represents an extreme situation that reveals the maximum pressures that can be achieved by a bubble before the matrix yields. We observe the emission of interstitial dislocation loops as the mechanisms by which the bubble creates room to host the He atoms. We use molecular dynamics and Monte Carlo computer simulations based on a new ternary FeCr--He empirical potential, which is an extension of our previous composition-dependent model for FeCr (A. Caro et al., Phys. Rev. Lett. 95 (2005) 075702). JF - Journal of Nuclear Materials AU - Caro, A AU - Hetherly, J AU - Stukowski, A AU - Caro, M AU - Martinez, E AU - Srivilliputhur, S AU - Zepeda-Ruiz, L AU - Nastasi, M AD - Los Alamos National Laboratory, Los Alamos, NM 87544, United States Y1 - 2011/11// PY - 2011 DA - Nov 2011 SP - 261 EP - 268 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 418 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Intermetallic compounds KW - FeCr KW - Monte Carlo simulation KW - Radioactive materials KW - Emissions KW - Alloys KW - Helium KW - Simulation KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/918066348?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Properties+of+Helium+bubbles+in+Fe+and+FeCr+alloys&rft.au=Caro%2C+A%3BHetherly%2C+J%3BStukowski%2C+A%3BCaro%2C+M%3BMartinez%2C+E%3BSrivilliputhur%2C+S%3BZepeda-Ruiz%2C+L%3BNastasi%2C+M&rft.aulast=Caro&rft.aufirst=A&rft.date=2011-11-01&rft.volume=418&rft.issue=1-3&rft.spage=261&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2011.07.010 L2 - http://www.sciencedirect.com/science/article/pii/S0022311511006623?_rdoc=33&_fmt=high&_origin=browse&_srch=hubEid(1-s2.0-S0022311511X00235)&_docanchor=&_ct=40&_refLink=Y&_zone=rslt_list_item&md5=23cbfbc85c251bf9a073ca31a9f75ff9 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-01-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Monte Carlo simulation; Radioactive materials; Emissions; Simulation; Helium; Alloys DO - http://dx.doi.org/10.1016/j.jnucmat.2011.07.010 ER - TY - JOUR T1 - Understanding melt generation beneath the slow-spreading Kolbeinsey Ridge using (super 238) U, (super 230) Th, and (super 231) Pa excesses AN - 911676306; 2012-005306 AB - To examine the petrogenesis and sources of basalts from the Kolbeinsey Ridge, one of the shallowest locations along the global ridge system, we present new measurements of Nd, Sr, Hf, and Pb isotopes and U-series disequilibria on 32 axial basalts. Young Kolbeinsey basalts (full-spreading rate=1.8cm/yr; 67 degrees 05'-70 degrees 26'N) display ( (super 230) Th/ (super 238) U)1 with ( (super 230) Th/ (super 238) U) from 0.95 to 1.30 and have low U (11.3-65.6ppb) and Th (33.0ppb-2.40ppm) concentrations. Except for characteristic isotopic enrichment near the Jan Mayen region, the otherwise depleted Kolbeinsey basalts (e.g. (super 87) Sr/ (super 86) Sr=0.70272-0.70301, epsilon (sub Nd) =8.4-10.5, epsilon (sub Hf) =15.4-19.6 (La/Yb) (sub N) =0.28-0.84) encompass a narrow range of ( (super 230) Th/ (super 232) Th) (1.20-1.32) over a large range in ( (super 238) U/ (super 232) Th) (0.94-1.32), producing a horizontal array on a ( (super 230) Th/ (super 232) Th) vs. ( (super 238) U/ (super 232) Th) diagram and a large variation in ( (super 230) Th/ (super 238) U). However, the ( (super 230) Th/ (super 238) U) of the Kolbeinsey Ridge basalts (0.96-1.30) are inversely correlated with ( (super 234) U/ (super 238) U) (1.001-1.031). Samples with low ( (super 230) Th/ (super 238) U) and elevated ( (super 234) U/ (super 238) U) reflect alteration by seawater or seawater-derived materials. The unaltered Kolbeinsey lavas with equilibrium (super 234) U/ (super 238) U have high ( (super 230) Th/ (super 238) U) values (> or =1.2), which are consistent with melting in the presence of garnet. This is in keeping with the thick crust and anomalously shallow axial depth for the Kolbeinsey Ridge, which is thought to be the product of large degrees of melting in a long melt column. A time-dependent, dynamic melting scenario involving a long, slowly upwelling melting column that initiates well within the garnet peridotite stability zone can, in general, reproduce the ( (super 230) Th/ (super 238) U) and ( (super 231) Pa/ (super 235) U) ratios in uncontaminated Kolbeinsey lavas, but low ( (super 231) Pa/ (super 235) U) ratios in Eggvin Bank samples suggest eclogite involvement in the source for that ridge segment. JF - Geochimica et Cosmochimica Acta AU - Elkins, L J AU - Sims, K W W AU - Prytulak, J AU - Elliott, T AU - Mattielli, N AU - Blichert-Toft, J AU - Blusztajn, J AU - Dunbar, N AU - Devey, C AU - Mertz, D F AU - Schilling, J G AU - Murrell, M Y1 - 2011/11// PY - 2011 DA - November 2011 SP - 6300 EP - 6329 PB - Elsevier, New York, NY VL - 75 IS - 21 SN - 0016-7037, 0016-7037 KW - U/Pb KW - mass spectra KW - lead KW - Th/U KW - uranium disequilibrium KW - electron probe data KW - mineral composition KW - basalts KW - sea-floor spreading KW - absolute age KW - Pa-231 KW - Quaternary KW - magmatism KW - Jan Mayen Ridge KW - correlation KW - U-238/Th-230 KW - plate tectonics KW - uranium KW - strontium KW - isotope fractionation KW - alteration KW - sea water KW - volcanic rocks KW - isotopes KW - igneous rocks KW - Kolbeinsey Ridge KW - Norwegian Sea KW - Eggvin Bank KW - stable isotopes KW - melts KW - Cenozoic KW - radioactive isotopes KW - hafnium KW - dates KW - protactinium KW - Arctic Ocean KW - spectra KW - rare earths KW - trace elements KW - geochemistry KW - spreading centers KW - alkaline earth metals KW - petrology KW - isotope ratios KW - silicate melts KW - Nd-144/Nd-143 KW - ICP mass spectra KW - metals KW - mid-ocean ridge basalts KW - thorium KW - neodymium KW - actinides KW - 02D:Isotope geochemistry KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/911676306?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=Understanding+melt+generation+beneath+the+slow-spreading+Kolbeinsey+Ridge+using+%28super+238%29+U%2C+%28super+230%29+Th%2C+and+%28super+231%29+Pa+excesses&rft.au=Elkins%2C+L+J%3BSims%2C+K+W+W%3BPrytulak%2C+J%3BElliott%2C+T%3BMattielli%2C+N%3BBlichert-Toft%2C+J%3BBlusztajn%2C+J%3BDunbar%2C+N%3BDevey%2C+C%3BMertz%2C+D+F%3BSchilling%2C+J+G%3BMurrell%2C+M&rft.aulast=Elkins&rft.aufirst=L&rft.date=2011-11-01&rft.volume=75&rft.issue=21&rft.spage=6300&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2011.08.020 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 188 N1 - PubXState - NY N1 - Document feature - illus. incl. 5 tables, sketch map N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-06-07 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - absolute age; actinides; alkaline earth metals; alteration; Arctic Ocean; basalts; Cenozoic; correlation; dates; Eggvin Bank; electron probe data; geochemistry; hafnium; ICP mass spectra; igneous rocks; isotope fractionation; isotope ratios; isotopes; Jan Mayen Ridge; Kolbeinsey Ridge; lead; magmatism; mass spectra; melts; metals; mid-ocean ridge basalts; mineral composition; Nd-144/Nd-143; neodymium; Norwegian Sea; Pa-231; petrology; plate tectonics; protactinium; Quaternary; radioactive isotopes; rare earths; sea water; sea-floor spreading; silicate melts; spectra; spreading centers; stable isotopes; strontium; Th/U; thorium; trace elements; U-238/Th-230; U/Pb; uranium; uranium disequilibrium; volcanic rocks DO - http://dx.doi.org/10.1016/j.gca.2011.08.020 ER - TY - JOUR T1 - Effect of bicarbonate on corrosion of carbon steel in CO sub(2) saturated brines AN - 907177016; 16071729 AB - The effect of bicarbonate concentration (HCO super(-) sub(3)) on bare steel surface corrosion was investigated experimentally in ambient CO sub(2)-saturated solutions. In the presence of CO sub(2), pH was adjusted by adding NaHCO sub(3) solution or powder. Corrosion rate decreased with pH increasing at the range of pH 4-5, was little changed at pH 5-6 and interestingly increased at pH 6-8. Thermodynamic calculations of CO sub(2) aqueous speciation showed that only bicarbonate concentration increased as pH increased from 4 to 8 while the other corrosion-active species including proton and carbonic acid either decreased or changed little, respectively. Thus we have demonstrated that bicarbonate is an active corrosion species and is important to corrosion at pH 6-8. Our earlier mechanistic corrosion model (Han et al., 2011a) was modified to incorporate bicarbonate-induced corrosion and demonstrated good agreement with experimental observations. JF - International Journal of Greenhouse Gas Control AU - Han, Jiabin AU - Zhang, Jinsuo AU - Carey, JWilliam AD - Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, jiabin.han@gmail.com Y1 - 2011/11// PY - 2011 DA - Nov 2011 SP - 1680 EP - 1683 PB - Elsevier B.V., The Boulevard Kidlington Oxford OX5 1GB United Kingdom VL - 5 IS - 6 SN - 1750-5836, 1750-5836 KW - Environment Abstracts; Pollution Abstracts KW - Carbon dioxide KW - Corrosion KW - P 0000:AIR POLLUTION KW - ENA 20:Weather Modification & Geophysical Change UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907177016?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=International+Journal+of+Greenhouse+Gas+Control&rft.atitle=Effect+of+bicarbonate+on+corrosion+of+carbon+steel+in+CO+sub%282%29+saturated+brines&rft.au=Han%2C+Jiabin%3BZhang%2C+Jinsuo%3BCarey%2C+JWilliam&rft.aulast=Han&rft.aufirst=Jiabin&rft.date=2011-11-01&rft.volume=5&rft.issue=6&rft.spage=1680&rft.isbn=&rft.btitle=&rft.title=International+Journal+of+Greenhouse+Gas+Control&rft.issn=17505836&rft_id=info:doi/10.1016%2Fj.ijggc.2011.08.003 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-11-01 N1 - Last updated - 2014-02-21 N1 - SubjectsTermNotLitGenreText - Corrosion DO - http://dx.doi.org/10.1016/j.ijggc.2011.08.003 ER - TY - JOUR T1 - A Semantic Registry for Digital Library Collections and Services AN - 1221405759; 201211951 AB - The Semantic Web has to date promised far more than it has been able to deliver. Libraries have been understandably cautious about investing extensively in ontology creation, mapping data to semantic representations, or tackling the hard problems of semantically describing collections and services. We look at the evolution of network addressable services, to service oriented architectures, and now toward semantically enhanced service oriented architectures. We also investigate various library technology standards that might influence semantic service and collection descriptions, as well as semantic registries. Next, we describe our own efforts to build a semantic registry of services and collections, for semantic metadata collections. Finally, we speculate about how these standards may evolve in the future. Adapted from the source document. JF - D-Lib Magazine AU - Powell, James E AU - Black, Krista AU - Collins, Linn Marks AD - Los Alamos National Laboratory jepowell@lanl.gov Y1 - 2011/11// PY - 2011 DA - November 2011 PB - Corporation for National Research Initiatives, Reston, VA VL - 17 IS - 11-12 SN - 1082-9873, 1082-9873 KW - Information architecture KW - Research organization libraries KW - Standards KW - Metadata KW - Semantic web KW - Digital libraries KW - article KW - 13.11: INFORMATION STORAGE AND RETRIEVAL - NETWORKS UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1221405759?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=D-Lib+Magazine&rft.atitle=A+Semantic+Registry+for+Digital+Library+Collections+and+Services&rft.au=Powell%2C+James+E%3BBlack%2C+Krista%3BCollins%2C+Linn+Marks&rft.aulast=Powell&rft.aufirst=James&rft.date=2011-11-01&rft.volume=17&rft.issue=11-12&rft.spage=&rft.isbn=&rft.btitle=&rft.title=D-Lib+Magazine&rft.issn=10829873&rft_id=info:doi/ L2 - http://www.dlib.org LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2012-12-01 N1 - Last updated - 2016-09-27 N1 - CODEN - DLMAF7 N1 - SubjectsTermNotLitGenreText - Research organization libraries; Digital libraries; Information architecture; Metadata; Semantic web; Standards ER - TY - JOUR T1 - Acoustic lysis of vegetative bacterial cells: Method and device development AN - 1038597620; 17030523 AB - A critical problem of many pathogen detection assays is the availability of intracellular protein and deoxyribonucleic acid (DNA). Acoustic lysis of suspended vegetative bacterial cells in a microfluidic system offers several advantages over conventional lysis techniques. The intracellular proteins and DNA are released and available for detection. A novel acoustic lysing alternative technique to the existing lysing methods for sample preparation and lysis step is proposed. We report here an efficient lysis device that uses acoustic excitation for performing lysis of Gram-positive and Gram-negative vegetative cells and has a high yield in a short amount of time. We also verified the condition of released protein since one of the major uses of vegetative cells lysis is for protein expression studies. Fluorimetry and flow cytometry were used to assess the degree of damage induced on the cells by the actual lysis method. The acoustic device allows the delivery of proteins in a non-denatured form, without adding chemicals, particles or other substances (e.g.enzymes) that could complicate the process or the detection procedure. The lysis device operates at low power (50-400 mW) and short time (3 min) and has high efficiency in comparison to current lysis standards (>85% vs.12-50%). JF - Analytical Methods AU - Marina, Oana C AU - Sanders, Claire K AU - Kaduchak, Gregory AU - Goddard, Gregory R AU - Graves, Steven W AD - Bioscience Division; Mail Stop M888; Los Alamos National Laboratory; PO Box 1663; Los Alamos; NM; 87545; +505-667-9024; , oanam@lanl.gov Y1 - 2011/11// PY - 2011 DA - Nov 2011 SP - 2573 EP - 2578 PB - Royal Society of Chemistry, c/o Springer-Verlag New York Inc. Secaucus New Jersey 07096 2485 United States VL - 3 IS - 11 SN - 1759-9660, 1759-9660 KW - Microbiology Abstracts B: Bacteriology KW - Flow cytometry KW - Bacteria KW - Microfluidics KW - Acoustics KW - DNA KW - Pathogens KW - Vegetative cells KW - J 02330:Biochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1038597620?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Analytical+Methods&rft.atitle=Acoustic+lysis+of+vegetative+bacterial+cells%3A+Method+and+device+development&rft.au=Marina%2C+Oana+C%3BSanders%2C+Claire+K%3BKaduchak%2C+Gregory%3BGoddard%2C+Gregory+R%3BGraves%2C+Steven+W&rft.aulast=Marina&rft.aufirst=Oana&rft.date=2011-11-01&rft.volume=3&rft.issue=11&rft.spage=2573&rft.isbn=&rft.btitle=&rft.title=Analytical+Methods&rft.issn=17599660&rft_id=info:doi/10.1039%2Fc1ay05326d LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Number of references - 24 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Flow cytometry; Microfluidics; Acoustics; DNA; Pathogens; Vegetative cells; Bacteria DO - http://dx.doi.org/10.1039/c1ay05326d ER - TY - JOUR T1 - On Using Code Emulators and Monte Carlo Estimation to Predict Assembly Attributes of Spent Fuel Assemblies for Safeguards Applications AN - 1009817231; 16121860 AB - The quantification of the plutonium mass in spent nuclear fuel assemblies is an important measurement for nuclear safeguards practitioners. A program is well underway to develop nondestructive assay instruments that, when combined, will be able to quantify the plutonium content of a spent nuclear fuel assembly. Each instrument will quantify a specific attribute of the spent fuel assembly, e.g., the fissile content. In this paper, we present a Monte Carlo-based method of estimating the mean and distribution of some assembly attributes. An MCNPX model of each instrument has been created, and the response of the instrument was simulated for a range of spent fuel assemblies with discrete parameters (e.g., burnup, initial enrichment, and cooling time). The Monte Carlo-based method interpolates between the modeled results for an instrument to emulate a response for parameters not explicitly modeled. We demonstrate the usefulness of this technique in applying the technique to six different instruments under investigation. The results show that this Monte Carlo-based method can be used to estimate the assembly attributes of a spent fuel assembly based upon the measured response from the instrument. JF - Nuclear Science and Engineering AU - Conlin, Jeremy Lloyd AU - Tobin, Stephen J AU - Lafleur, Adrienne M AU - Hu, Jianwei AU - Lee, Taehoon AU - Sandoval, Nathan P AU - Schear, Melissa A AD - Los Alamos National Laboratory, Los Alamos, New Mexico 87544 jlconlin@lanl.gov Y1 - 2011/11// PY - 2011 DA - Nov 2011 SP - 314 EP - 328 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 169 IS - 3 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Assembly KW - Computer simulation KW - Estimates KW - Mathematical models KW - Monte Carlo methods KW - Plutonium KW - Spent fuels KW - Spent nuclear fuels UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1009817231?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=On+Using+Code+Emulators+and+Monte+Carlo+Estimation+to+Predict+Assembly+Attributes+of+Spent+Fuel+Assemblies+for+Safeguards+Applications&rft.au=Conlin%2C+Jeremy+Lloyd%3BTobin%2C+Stephen+J%3BLafleur%2C+Adrienne+M%3BHu%2C+Jianwei%3BLee%2C+Taehoon%3BSandoval%2C+Nathan+P%3BSchear%2C+Melissa+A&rft.aulast=Conlin&rft.aufirst=Jeremy&rft.date=2011-11-01&rft.volume=169&rft.issue=3&rft.spage=314&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-05-01 N1 - Last updated - 2012-10-04 ER - TY - CPAPER T1 - New synthetic routes for the preparation of fluorescent metal nanoclusters T2 - 63rd Southeast Regional Meeting of the American Chemical Society (SERMACS 2011) AN - 1312949049; 6040667 JF - 63rd Southeast Regional Meeting of the American Chemical Society (SERMACS 2011) AU - Arachchige, Indika AU - Brumbach, Michael AU - Martinez, Jennifer AU - Ivanov, Sergei Y1 - 2011/10/26/ PY - 2011 DA - 2011 Oct 26 KW - Metals UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312949049?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=63rd+Southeast+Regional+Meeting+of+the+American+Chemical+Society+%28SERMACS+2011%29&rft.atitle=New+synthetic+routes+for+the+preparation+of+fluorescent+metal+nanoclusters&rft.au=Arachchige%2C+Indika%3BBrumbach%2C+Michael%3BMartinez%2C+Jennifer%3BIvanov%2C+Sergei&rft.aulast=Arachchige&rft.aufirst=Indika&rft.date=2011-10-26&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=63rd+Southeast+Regional+Meeting+of+the+American+Chemical+Society+%28SERMACS+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://abstracts.acs.org/chem/sermacs/program/divisionindex.php?act=session&val=102602&prog=102602 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Colloidal Nanomaterials As the Building Blocks for Next-Generation Solar Cells T2 - 2011 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2011) AN - 1313032332; 6079525 JF - 2011 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2011) AU - Pietryga, Jeffrey Y1 - 2011/10/16/ PY - 2011 DA - 2011 Oct 16 KW - Nanotechnology KW - solar cells KW - nanotechnology KW - Solar cells UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313032332?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2011+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2011%29&rft.atitle=Colloidal+Nanomaterials+As+the+Building+Blocks+for+Next-Generation+Solar+Cells&rft.au=Pietryga%2C+Jeffrey&rft.aulast=Pietryga&rft.aufirst=Jeffrey&rft.date=2011-10-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2011+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://www.aiche.org/conferences/annualmeeting/meetingprogram/2011topical.aspx LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Bulk Production of Generator Parent 72se At the Los Alamos IPF Using a NaBr Target T2 - 2011 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2011) AN - 1312956347; 6078863 JF - 2011 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2011) AU - Ballard, Beau AU - Wycoff, Donald AU - Lenz, John AU - Jurisson, Silvia AU - Birnbaum, Eva AU - John, Kevin AU - Cutler, Cathy AU - Nortier, F AU - Taylor, Wayne AU - Fassbender, Michael Y1 - 2011/10/16/ PY - 2011 DA - 2011 Oct 16 KW - USA, New Mexico, Los Alamos KW - Chemical engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312956347?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2011+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2011%29&rft.atitle=Bulk+Production+of+Generator+Parent+72se+At+the+Los+Alamos+IPF+Using+a+NaBr+Target&rft.au=Ballard%2C+Beau%3BWycoff%2C+Donald%3BLenz%2C+John%3BJurisson%2C+Silvia%3BBirnbaum%2C+Eva%3BJohn%2C+Kevin%3BCutler%2C+Cathy%3BNortier%2C+F%3BTaylor%2C+Wayne%3BFassbender%2C+Michael&rft.aulast=Ballard&rft.aufirst=Beau&rft.date=2011-10-16&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2011+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://www.aiche.org/conferences/annualmeeting/meetingprogram/2011topical.aspx LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Greening coal: breakthroughs and challenges in carbon capture and storage. AN - 898504750; 21905694 AB - Like it or not, coal is here to stay, for the next few decades at least. Continued use of coal in this age of growing greenhouse gas controls will require removing carbon dioxide from the coal waste stream. We already remove toxicants such as sulfur dioxide and mercury, and the removal of CO₂ is the next step in reducing the environmental impacts of using coal as an energy source (i.e., greening coal). This paper outlines some of the complexities encountered in capturing CO₂ from coal, transporting it large distances through pipelines, and storing it safely underground. JF - Environmental science & technology AU - Stauffer, Philip H AU - Keating, Gordon N AU - Middleton, Richard S AU - Viswanathan, Hari S AU - Berchtold, Kathryn A AU - Singh, Rajinder P AU - Pawar, Rajesh J AU - Mancino, Anthony AD - Earth and Environmental Sciences Division (EES), Los Alamos. National Laboratory (LANL), USA. Y1 - 2011/10/15/ PY - 2011 DA - 2011 Oct 15 SP - 8597 EP - 8604 VL - 45 IS - 20 KW - Coal KW - 0 KW - Carbon Dioxide KW - 142M471B3J KW - Index Medicus KW - Environmental Monitoring KW - Air Pollution -- prevention & control UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/898504750?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+science+%26+technology&rft.atitle=Greening+coal%3A+breakthroughs+and+challenges+in+carbon+capture+and+storage.&rft.au=Stauffer%2C+Philip+H%3BKeating%2C+Gordon+N%3BMiddleton%2C+Richard+S%3BViswanathan%2C+Hari+S%3BBerchtold%2C+Kathryn+A%3BSingh%2C+Rajinder+P%3BPawar%2C+Rajesh+J%3BMancino%2C+Anthony&rft.aulast=Stauffer&rft.aufirst=Philip&rft.date=2011-10-15&rft.volume=45&rft.issue=20&rft.spage=8597&rft.isbn=&rft.btitle=&rft.title=Environmental+science+%26+technology&rft.issn=1520-5851&rft_id=info:doi/10.1021%2Fes200510f LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2012-02-06 N1 - Date created - 2011-10-13 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/es200510f ER - TY - JOUR T1 - Quantifying Intramolecular Binding in Multivalent Interactions: A Structure-Based Synergistic Study on Grb2-Sos1 Complex AN - 1872839703; 16207784 AB - Numerous signaling proteins use multivalent binding to increase the specificity and affinity of their interactions within the cell. Enhancement arises because the effective binding constant for multivalent binding is larger than the binding constants for each individual interaction. We seek to gain both qualitative and quantitative understanding of the multivalent interactions of an adaptor protein, growth factor receptor bound protein-2 (Grb2), containing two SH3 domains interacting with the nucleotide exchange factor son-of-sevenless 1 (Sos1) containing multiple polyproline motifs separated by flexible unstructured regions. Grb2 mediates the recruitment of Sos1 from the cytosol to the plasma membrane where it activates Ras by inducing the exchange of GDP for GTP. First, using a combination of evolutionary information and binding energy calculations, we predict an additional polyproline motif in Sos1 that binds to the SH3 domains of Grb2. This gives rise to a total of five polyproline motifs in Sos1 that are capable of binding to the two SH3 domains of Grb2. Then, using a hybrid method combining molecular dynamics simulations and polymer models, we estimate the enhancement in local concentration of a polyproline motif on Sos1 near an unbound SH3 domain of Grb2 when its other SH3 domain is bound to a different polyproline motif on Sos1. We show that the local concentration of the Sos1 motifs that a Grb2 SH3 domain experiences is approximately 1000 times greater than the cellular concentration of Sos1. Finally, we calculate the intramolecular equilibrium constants for the crosslinking of Grb2 on Sos1 and use thermodynamic modeling to calculate the stoichiometry. With these equilibrium constants, we are able to predict the distribution of complexes that form at physiological concentrations. We believe this is the first systematic analysis that combines sequence, structure, and thermodynamic analyses to determine the stoichiometry of the complexes that are dominant in the cellular environment. Many biochemical interactions are mediated by multivalent binding where signaling proteins use relatively weak promiscuous interactions to increase the strength and specificity of complex formation. For a bivalent adaptor protein binding to a multivalent ligand, the tethering of one of the adaptors binding sites to a motif on a multivalent ligand constrains the adaptors second binding site to a region with a high local concentration of ligand binding motifs. Intramolecular equilibrium constants associated with multivalency are difficult to measure. Typically, polymer models are utilized to estimate the enhancement in local concentration and, when the biomolecular equilibrium constants for the individual sites are known, to obtain intramolecular equilibrium constants. However, flexibility of structured regions in proteins that contain the binding motifs restricts the application of simple polymer models for many systems. Here, we develop a hybrid method combining molecular dynamics simulations and polymer models to estimate the intramolecular equilibrium constants. We apply this method to study the multivalent interactions between the widely expressed adaptor protein growth factor receptor bound protein-2 (Grb2) and the nucleotide exchange factor son of sevenless 1 (Sos1). JF - PLoS Computational Biology AU - Sethi, Anurag AU - Goldstein, Byron AU - Gnanakaran, S AD - Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, New Mexico, United States of America Y1 - 2011/10/13/ PY - 2011 DA - 2011 Oct 13 PB - Public Library of Science, 185 Berry Street San Francisco CA 94107 United States VL - 7 IS - 0 SN - 1553-734X, 1553-734X KW - Biotechnology and Bioengineering Abstracts UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1872839703?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=PLoS+Computational+Biology&rft.atitle=Quantifying+Intramolecular+Binding+in+Multivalent+Interactions%3A+A+Structure-Based+Synergistic+Study+on+Grb2-Sos1+Complex&rft.au=Sethi%2C+Anurag%3BGoldstein%2C+Byron%3BGnanakaran%2C+S&rft.aulast=Sethi&rft.aufirst=Anurag&rft.date=2011-10-13&rft.volume=7&rft.issue=0&rft.spage=&rft.isbn=&rft.btitle=&rft.title=PLoS+Computational+Biology&rft.issn=1553734X&rft_id=info:doi/10.1371%2Fjournal.pcbi.1002192 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2017-03-01 N1 - Last updated - 2017-03-01 DO - http://dx.doi.org/10.1371/journal.pcbi.1002192 ER - TY - JOUR T1 - Real world hydrologic assessment of a fully-distributed hydrological model in a parallel computing environment AN - 921716370; 2012-024190 AB - A major challenge in the use of fully-distributed hydrologic models has been the lack of computational capabilities for high-resolution, long-term simulations in large river basins. In this study, we present the parallel model implementation and real-world hydrologic assessment of the Triangulated Irregular Network (TIN)-based Real-time Integrated Basin Simulator (tRIBS). Our parallelization approach is based on the decomposition of a complex watershed using the channel network as a directed graph. The resulting sub-basin partitioning divides effort among processors and handles hydrologic exchanges across boundaries. Through numerical experiments in a set of nested basins, we quantify parallel performance relative to serial runs for a range of processors, simulation complexities and lengths, and sub-basin partitioning methods, while accounting for inter-run variability on a parallel computing system. In contrast to serial simulations, the parallel model speed-up depends on the variability of hydrologic processes. Load balancing significantly improves parallel speed-up with proportionally faster runs as simulation complexity (domain resolution and channel network extent) increases. The best strategy for large river basins is to combine a balanced partitioning with an extended channel network, with potential savings through a lower TIN resolution. Based on these advances, a wider range of applications for fully-distributed hydrologic models are now possible. This is illustrated through a set of ensemble forecasts that account for precipitation uncertainty derived from a statistical downscaling model. JF - Journal of Hydrology AU - Vivoni, E R AU - Mascaro, Giuseppe AU - Mniszewski, Susan AU - Fasel, Patricia AU - Springer, E P AU - Ivanov, V Y AU - Bras, R L Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 483 EP - 496 PB - Elsevier, Amsterdam VL - 409 IS - 1-2 SN - 0022-1694, 0022-1694 KW - United States KW - data processing KW - digital terrain models KW - simulation KW - topography KW - compartmentalization KW - Adair County Oklahoma KW - drainage basins KW - uncertainty KW - hydrology KW - experimental studies KW - Cherokee County Oklahoma KW - rainfall KW - Eldon Oklahoma KW - surface water KW - statistical analysis KW - prediction KW - water balance KW - models KW - case studies KW - Oklahoma KW - Baron Fork basin KW - runoff KW - Peacheater Creek KW - Christie Oklahoma KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921716370?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Hydrology&rft.atitle=Real+world+hydrologic+assessment+of+a+fully-distributed+hydrological+model+in+a+parallel+computing+environment&rft.au=Vivoni%2C+E+R%3BMascaro%2C+Giuseppe%3BMniszewski%2C+Susan%3BFasel%2C+Patricia%3BSpringer%2C+E+P%3BIvanov%2C+V+Y%3BBras%2C+R+L&rft.aulast=Vivoni&rft.aufirst=E&rft.date=2011-10-01&rft.volume=409&rft.issue=1-2&rft.spage=483&rft.isbn=&rft.btitle=&rft.title=Journal+of+Hydrology&rft.issn=00221694&rft_id=info:doi/10.1016%2Fj.jhydrol.2011.08.053 L2 - http://www.sciencedirect.com/science/journal/00221694 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 49 N1 - Document feature - illus. incl. 5 tables, sketch maps N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-06-07 N1 - CODEN - JHYDA7 N1 - SubjectsTermNotLitGenreText - Adair County Oklahoma; Baron Fork basin; case studies; Cherokee County Oklahoma; Christie Oklahoma; compartmentalization; data processing; digital terrain models; drainage basins; Eldon Oklahoma; experimental studies; hydrology; models; Oklahoma; Peacheater Creek; prediction; rainfall; runoff; simulation; statistical analysis; surface water; topography; uncertainty; United States; water balance DO - http://dx.doi.org/10.1016/j.jhydrol.2011.08.053 ER - TY - JOUR T1 - Texturing in Earth's inner core due to preferential growth in its equatorial belt AN - 921715929; 2012-022547 AB - We propose an extension of the model by Yoshida et al., 1996 where deformation in the inner core is forced by preferential growth in the equatorial belt, by taking into account the presence of a stable compositional stratification. Stratification inhibits vertical motion, imposes a flow parallel to isodensity surfaces, and concentrates most deformation in a shallow shear layer of thickness nearly equal B (super -1/5) , where B is the dimensionless buoyancy number. The localization of the flow results in large strain rates and enables the development of a strong alignment of iron crystals in the upper inner core. We couple our dynamical model with a numerical model of texture development and compute the time evolution of the lattice preferred orientation of different samples in the inner core. With sufficient stratification, texturing is significant in the uppermost inner core. In contrast, the deeper inner core is unaffected by any flow and may preserve a fossil texture. We investigate the effect of an initial texture resulting from solidification texturing at the ICB. In the present inner core, the deformation rate in the shallow shear layer is large and can significantly alter the solidification texturing, but the solidification texture acquired early in the inner core history can be preserved in the deeper part. Using elastic constants from ab initio calculations, we predict different maps of anisotropy in the modern inner core. A model with both solidification texturing and subsequent deformation in a stratified inner core produces a global anisotropy in reasonable agreement with seismological observations. JF - Physics of the Earth and Planetary Interiors AU - Deguen, R AU - Cardin, P AU - Merkel, S AU - Lebensohn, R A A2 - Bergman, Michael A2 - Hulot, Gauthier A2 - Tanaka, Satoru A2 - Aurnou, Jonathan Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 173 EP - 184 PB - Elsevier, Amsterdam VL - 188 IS - 3-4 SN - 0031-9201, 0031-9201 KW - orientation KW - seismology KW - numerical models KW - lattice KW - equatorial region KW - density KW - textures KW - equations KW - elastic constants KW - deformation KW - simulation KW - iron KW - buoyancy KW - mineral composition KW - metals KW - mathematical methods KW - crystallization KW - core KW - inner core KW - anisotropy KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921715929?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Physics+of+the+Earth+and+Planetary+Interiors&rft.atitle=Texturing+in+Earth%27s+inner+core+due+to+preferential+growth+in+its+equatorial+belt&rft.au=Deguen%2C+R%3BCardin%2C+P%3BMerkel%2C+S%3BLebensohn%2C+R+A&rft.aulast=Deguen&rft.aufirst=R&rft.date=2011-10-01&rft.volume=188&rft.issue=3-4&rft.spage=173&rft.isbn=&rft.btitle=&rft.title=Physics+of+the+Earth+and+Planetary+Interiors&rft.issn=00319201&rft_id=info:doi/10.1016%2Fj.pepi.2011.08.008 L2 - http://www.sciencedirect.com/science/journal/00319201 LA - English DB - GeoRef N1 - Conference title - SEDI 2010 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 94 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-06-07 N1 - CODEN - PEPIAM N1 - SubjectsTermNotLitGenreText - anisotropy; buoyancy; core; crystallization; deformation; density; elastic constants; equations; equatorial region; inner core; iron; lattice; mathematical methods; metals; mineral composition; numerical models; orientation; seismology; simulation; textures DO - http://dx.doi.org/10.1016/j.pepi.2011.08.008 ER - TY - JOUR T1 - Shear punch testing of candidate reactor materials after irradiation in fast reactors and spallation environments AN - 918072591; 16136446 AB - Ferritic/martensitic steels and nickel-base superalloys are potential materials for use in spallation targets and fusion and fast reactors. To investigate the effects of irradiation on these materials, tests were performed after irradiation in the high energy proton beam at the Paul Scherrer Institute (SINQ Target Irradiation Program (STIP), 570 MeV), as well on specimens obtained from a driver duct irradiated in the Fast Flux Test Facility (FFTF). Dose accumulations were up to 18 dpa for STIP irradiations (at 147-406 degree C) and up to 155 dpa in FFTF (at 383-505 degree C). The helium/dpa ratios ranged from 0.2 to 80 appm/dpa. Mechanical testing was performed at 25 degree C. Increases in shear yield and shear maximum stress with increasing dose mirrored the results observed from companion tensile tests. JF - Journal of Nuclear Materials AU - Maloy, SA AU - Romero, T J AU - Hosemann, P AU - Toloczko, M B AU - Dai, Y AD - Los Alamos National Laboratory (LANL), Los Alamos, NM 87545, USA, maloy@lanl.gov Y1 - 2011/10/01/ PY - 2011 DA - 2011 Oct 01 SP - 1005 EP - 1008 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 417 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Nuclear reactors KW - Irradiation KW - Radioactive materials KW - Helium KW - Stress KW - Steel KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/918072591?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Shear+punch+testing+of+candidate+reactor+materials+after+irradiation+in+fast+reactors+and+spallation+environments&rft.au=Maloy%2C+SA%3BRomero%2C+T+J%3BHosemann%2C+P%3BToloczko%2C+M+B%3BDai%2C+Y&rft.aulast=Maloy&rft.aufirst=SA&rft.date=2011-10-01&rft.volume=417&rft.issue=1-3&rft.spage=1005&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2011.02.003 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-01-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Nuclear reactors; Irradiation; Radioactive materials; Stress; Helium; Steel DO - http://dx.doi.org/10.1016/j.jnucmat.2011.02.003 ER - TY - JOUR T1 - Macro and microscale mechanical testing and local electrode atom probe measurements of STIP irradiated F82H, Fe-8Cr ODS and Fe-8Cr-2W ODS AN - 918062377; 16136333 AB - The reduced activation ferritic/martensitic alloy F82H (Fe-8Cr-2W-0.2V-0.04Ta-0.1C) is being considered as a structural material for several different fusion related nuclear applications. The oxide dispersion strengthened (ODS) alloys Fe-8Cr-2W ODS and Fe-8Cr ODS were developed for better high-temperature strength and radiation tolerance. These materials have been exposed to a neutron and proton environment in the Spallation Target Irradiation Program (STIP) (<13 dpa) with an average He/dpa ratio of 60 appm He/dpa at irradiation temperatures 159-347 degree C. After irradiation, the samples were tensile tested at different temperatures. The post tensile testing fractured parts were collected and nanoindentation, microcompression testing and local electrode atom probe was conducted. The information gained by local electron atom probe in combination with the micro, nano and macroscopic mechanical tests allows one to establish a fundamental understanding of the relationship between the data measured at different scales on irradiated materials. JF - Journal of Nuclear Materials AU - Hosemann, P AU - Stergar, E AU - Peng, L AU - Dai, Y AU - Maloy, SA AU - Pouchon, MA AU - Shiba, K AU - Hamaguchi, D AU - Leitner, H AD - Los Alamos National Laboratory (LANL), MST-8, USA, peterh@lanl.gov Y1 - 2011/10/01/ PY - 2011 DA - 2011 Oct 01 SP - 274 EP - 278 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 417 IS - 1-3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Ferritic stainless steels KW - Martensitic stainless steels KW - F82H KW - Irradiation KW - Electrodes KW - Radioactive materials KW - Temperature KW - Alloys KW - ENA 14:Radiological Contamination UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/918062377?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Macro+and+microscale+mechanical+testing+and+local+electrode+atom+probe+measurements+of+STIP+irradiated+F82H%2C+Fe-8Cr+ODS+and+Fe-8Cr-2W+ODS&rft.au=Hosemann%2C+P%3BStergar%2C+E%3BPeng%2C+L%3BDai%2C+Y%3BMaloy%2C+SA%3BPouchon%2C+MA%3BShiba%2C+K%3BHamaguchi%2C+D%3BLeitner%2C+H&rft.aulast=Hosemann&rft.aufirst=P&rft.date=2011-10-01&rft.volume=417&rft.issue=1-3&rft.spage=274&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2010.12.200 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-01-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Irradiation; Radioactive materials; Electrodes; Temperature; Alloys DO - http://dx.doi.org/10.1016/j.jnucmat.2010.12.200 ER - TY - JOUR T1 - The influence of multivariate analysis methods and target grain size on the accuracy of remote quantitative chemical analysis of rocks using laser induced breakdown spectroscopy AN - 907924021; 2012-001552 JF - Icarus AU - Anderson, Ryan B AU - Morris, Richard V AU - Clegg, Samuel M AU - Bell, James F, III AU - Wiens, Roger C AU - Humphries, Seth D AU - Mertzman, Stanley A AU - Graff, Trevor G AU - McInroy, Rhonda Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 608 EP - 627 PB - Elsevier, New York, NY VL - 215 IS - 2 SN - 0019-1035, 0019-1035 KW - methods KW - laser-induced breakdown spectroscopy KW - data processing KW - Mars KW - sampling KW - quantitative analysis KW - multivariate analysis KW - standard materials KW - neural networks KW - algorithms KW - chemical composition KW - ChemCam instrument KW - partial least-squares analysis KW - chemical analysis KW - precision KW - principal components analysis KW - grain size KW - statistical analysis KW - terrestrial planets KW - planets KW - Mars Science Laboratory KW - spectroscopy KW - accuracy KW - regression analysis KW - remote sensing KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907924021?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=The+influence+of+multivariate+analysis+methods+and+target+grain+size+on+the+accuracy+of+remote+quantitative+chemical+analysis+of+rocks+using+laser+induced+breakdown+spectroscopy&rft.au=Anderson%2C+Ryan+B%3BMorris%2C+Richard+V%3BClegg%2C+Samuel+M%3BBell%2C+James+F%2C+III%3BWiens%2C+Roger+C%3BHumphries%2C+Seth+D%3BMertzman%2C+Stanley+A%3BGraff%2C+Trevor+G%3BMcInroy%2C+Rhonda&rft.aulast=Anderson&rft.aufirst=Ryan&rft.date=2011-10-01&rft.volume=215&rft.issue=2&rft.spage=608&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2011.07.034 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 51 N1 - PubXState - NY N1 - Document feature - illus. incl. 5 tables N1 - Last updated - 2012-06-07 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - accuracy; algorithms; ChemCam instrument; chemical analysis; chemical composition; data processing; grain size; laser-induced breakdown spectroscopy; Mars; Mars Science Laboratory; methods; multivariate analysis; neural networks; partial least-squares analysis; planets; precision; principal components analysis; quantitative analysis; regression analysis; remote sensing; sampling; spectroscopy; standard materials; statistical analysis; terrestrial planets DO - http://dx.doi.org/10.1016/j.icarus.2011.07.034 ER - TY - JOUR T1 - Impact of spectral smoothing on gamma radiation portal alarm probabilities AN - 904487130; 15586469 AB - Gamma detector counts are included in radiation portal monitors (RPM) to screen for illicit nuclear material. Gamma counts are sometimes smoothed to reduce variance in the estimated underlying true mean count rate, which is the "signal" in our context. Smoothing reduces total error variance in the estimated signal if the bias that smoothing introduces is more than offset by the variance reduction. An empirical RPM study for vehicle screening applications is presented for unsmoothed and smoothed gamma counts in low-resolution plastic scintillator detectors and in medium-resolution NaI detectors. JF - Applied Radiation and Isotopes AU - Burr, T AU - Hamada, M AU - Hengartner, N Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 1436 EP - 1446 PB - Elsevier B.V., P.O. Box 800 Kidlington Oxford OX5 1DX United Kingdom VL - 69 IS - 10 SN - 0969-8043, 0969-8043 KW - ASFA 2: Ocean Technology Policy & Non-Living Resources; Environment Abstracts KW - Gamma counts KW - Portal alarm probabilities KW - Spectral smoothing KW - Screening KW - Isotopes KW - Radioactive materials KW - Gamma radiation KW - Q2 09387:Navigation KW - ENA 14:Radiological Contamination UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/904487130?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Applied+Radiation+and+Isotopes&rft.atitle=Impact+of+spectral+smoothing+on+gamma+radiation+portal+alarm+probabilities&rft.au=Burr%2C+T%3BHamada%2C+M%3BHengartner%2C+N&rft.aulast=Burr&rft.aufirst=T&rft.date=2011-10-01&rft.volume=69&rft.issue=10&rft.spage=1436&rft.isbn=&rft.btitle=&rft.title=Applied+Radiation+and+Isotopes&rft.issn=09698043&rft_id=info:doi/10.1016%2Fj.apradiso.2011.05.009 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-10-01 N1 - Last updated - 2016-06-22 N1 - SubjectsTermNotLitGenreText - Screening; Gamma radiation; Isotopes; Radioactive materials DO - http://dx.doi.org/10.1016/j.apradiso.2011.05.009 ER - TY - JOUR T1 - A Pn spreading model constrained with observed amplitudes in Asia AN - 904461321; 2011-103235 AB - By modeling synthetic Pn amplitudes, my colleagues and I in 2007 proposed a Pn geometric-spreading model (Y2007) that takes into account the spherical shape of the Earth. In this study, I used a set of observed Pn amplitudes from the tectonically active regions of Asia to evaluate the performance of Y2007 and to develop new, observation-based Pn spreading models. Even though Y2007 provides improved geometric-spreading correction of Pn amplitudes over the traditional power-law model, the corrected amplitudes exhibit undesirable decay rate variations. To address this issue, I used a procedure to develop Pn spreading models based on observed data. I first correct the Pn amplitudes for attenuation using an average quality factor Q estimated from Y2007-corrected Pn amplitudes. I then developed a spreading model, which is a simplified version of Y2007, by fitting the corrected amplitudes. Compared with Y2007, the new spreading model significantly reduces amplitude variations, particularly at short distances. To more accurately model the complex data behavior, I also developed a segmented spreading model in which separate sets of model parameters are derived for amplitudes in different distance ranges. The spreading models developed in this study account for radially symmetric elastic and other effects, such as velocity gradient, forwarding scattering, and potential depth-dependent attenuation variation, as well as wavefront expansion and the spherical shape of the Earth. Using the new model for spreading correction results in better attenuation isolation and allows amplitudes in a broader distance range to be used in the accurate mapping of lateral attenuation variations. The method I employed in this study could be used as a general procedure to develop observation-based Pn spreading models for other regions. JF - Bulletin of the Seismological Society of America AU - Yang, Xiaoning Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 2201 EP - 2211 PB - Seismological Society of America, Berkeley, CA VL - 101 IS - 5 SN - 0037-1106, 0037-1106 KW - models KW - upper mantle KW - body waves KW - Pn-waves KW - geophysical methods KW - mantle KW - elastic waves KW - seismic waves KW - Asia KW - seismic methods KW - amplitude KW - 18:Solid-earth geophysics KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/904461321?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America&rft.atitle=A+Pn+spreading+model+constrained+with+observed+amplitudes+in+Asia&rft.au=Yang%2C+Xiaoning&rft.aulast=Yang&rft.aufirst=Xiaoning&rft.date=2011-10-01&rft.volume=101&rft.issue=5&rft.spage=2201&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120100314 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Seismological Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2011-01-01 N1 - Number of references - 31 N1 - PubXState - CA N1 - Document feature - illus. incl. 3 tables, sketch map N1 - Last updated - 2012-06-07 N1 - CODEN - BSSAAP N1 - SubjectsTermNotLitGenreText - amplitude; Asia; body waves; elastic waves; geophysical methods; mantle; models; Pn-waves; seismic methods; seismic waves; upper mantle DO - http://dx.doi.org/10.1785/0120100314 ER - TY - JOUR T1 - Paleomagnetism of the Quaternary Bandelier Tuff; implications for the tectonic evolution of the Espanola Basin, Rio Grande Rift AN - 904457954; 2011-100705 AB - We present newly acquired paleomagnetic data from Bandelier Tuff exposures in the Jemez Mountains (New Mexico) that show no statistically significant tectonic rotation over Quaternary time. Cooling units of the tuff were mapped in detail and correlated using new geochemical data, allowing us to confidently sample isochronous units for paleomagnetic remanence directions. In total, 410 specimens were subjected to step-wise thermal and alternating field demagnetization. Of the 40 accepted site means, 30 have alpha (sub 95) values < or =5 degrees . Analysis of the geographic distribution of the site-mean declinations of the data set reveals no statistically significant tectonic rotation either across (northwest/southeast) the northeast-striking Jemez fault or across (east/west) the north-striking Pajarito fault zone. Similarly, our data do not record any measurable relative change in declination difference (-1.1 degrees + or - 1.6 degrees ) that could be interpreted as a rotation over the approximately 0.36 m.y. time duration between deposition of the two principal stratigraphic members of the Bandelier Tuff. The step-over discussed in this paper is an area of exceptional structural complexity and, as such, meets the definition of "accommodation zone." We propose the name "Jemez-Embudo accommodation zone" for this composite of structural and volcanic features in recognition of its regional importance in the evolution of the Rio Grande rift. In this part of the rift, where Proterozoic- and Laramide-age faults have preconditioned the crust, idealized relay ramps, prevalent locally, do not occur at the regional scale. Instead, transfer fault zones have developed between half grabens dominated by preexisting faults. The pattern of faulting and accommodation of strain in the right-relayed step-over of the rift has been more or less invariant since the onset of rifting. From a global perspective, the difference between areas of modest crustal extension dominated by distributed deformation and those regions that develop transfer fault zones may ultimately be diagnostic of crustal conditioning and fault strength, such that weak fault systems focus strain within narrow zones. JF - Lithosphere AU - Sussman, Aviva J AU - Lewis, Claudia J AU - Mason, Stephanie N AU - Geissman, John W AU - Schultz-Fellenz, Emily AU - Oliva-Urcia, Belen AU - Gardner, Jamie Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 328 EP - 345 PB - Geological Society of America, Boulder, CO VL - 3 IS - 5 SN - 1941-8264, 1941-8264 KW - United States KW - Pajarito Plateau KW - New Mexico KW - strike-slip faults KW - silicon KW - Rio Grande Rift KW - Cenozoic KW - Tshirege Member KW - Bandelier Tuff KW - major elements KW - rotation KW - transfer faults KW - Valles Caldera KW - X-ray fluorescence spectra KW - Jemez Mountains KW - tectonics KW - spectra KW - trace elements KW - geochemistry KW - faults KW - Espanola Basin KW - North America KW - Quaternary KW - rubidium KW - alkali metals KW - paleomagnetism KW - deformation KW - reactivation KW - half grabens KW - niobium KW - titanium KW - metals KW - Pleistocene KW - Otowi Member KW - north-central New Mexico KW - 24:Quaternary geology KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/904457954?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Lithosphere&rft.atitle=Paleomagnetism+of+the+Quaternary+Bandelier+Tuff%3B+implications+for+the+tectonic+evolution+of+the+Espanola+Basin%2C+Rio+Grande+Rift&rft.au=Sussman%2C+Aviva+J%3BLewis%2C+Claudia+J%3BMason%2C+Stephanie+N%3BGeissman%2C+John+W%3BSchultz-Fellenz%2C+Emily%3BOliva-Urcia%2C+Belen%3BGardner%2C+Jamie&rft.aulast=Sussman&rft.aufirst=Aviva&rft.date=2011-10-01&rft.volume=3&rft.issue=5&rft.spage=328&rft.isbn=&rft.btitle=&rft.title=Lithosphere&rft.issn=19418264&rft_id=info:doi/10.1130%2FL128.1 L2 - http://lithosphere.gsapubs.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2011-01-01 N1 - Number of references - 105 N1 - PubXState - CO N1 - Document feature - illus. incl. strat. col., 2 tables, geol. sketch maps N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - alkali metals; Bandelier Tuff; Cenozoic; deformation; Espanola Basin; faults; geochemistry; half grabens; Jemez Mountains; major elements; metals; New Mexico; niobium; North America; north-central New Mexico; Otowi Member; Pajarito Plateau; paleomagnetism; Pleistocene; Quaternary; reactivation; Rio Grande Rift; rotation; rubidium; silicon; spectra; strike-slip faults; tectonics; titanium; trace elements; transfer faults; Tshirege Member; United States; Valles Caldera; X-ray fluorescence spectra DO - http://dx.doi.org/10.1130/L128.1 ER - TY - JOUR T1 - Application of the Differential Evolution Method to Solving Inverse Transport Problems AN - 1671329065; 16005012 AB - The differential evolution method, a powerful stochastic optimization algorithm that mimics the process of evolution in nature, is applied to inverse transport problems with several unknown parameters of mixed types, including interface location identification, source composition identification, and material mass density identification, in spherical and cylindrical radioactive source/shield systems. In spherical systems, measurements of leakages of discrete gamma-ray lines are assumed, while in cylindrical systems, measurements of scalar fluxes of discrete lines at points outside the system are assumed. The performance of the differential evolution algorithm is compared to the Levenberg-Marquardt method, a standard gradient-based technique, and the covariance matrix adaptation evolution strategy, another stochastic technique, on a variety of numerical test problems with several (i.e., three or more) unknown parameters. Numerical results indicate that differential evolution is the most adept method for finding the global optimum for these problems. In spherical geometry, differential evolution implemented serially is run-time competitive with gradient-based methods, while a parallel version of differential evolution would be run-time competitive with gradient-based techniques in cylindrical geometry. A hybrid differential evolution/Levenberg-Marquardt method is also introduced, and numerical results indicate that it can be a fast and robust optimizer for inverse transport problems. JF - Nuclear Science and Engineering AU - Bledsoe, Keith C AU - Favorite, Jeffrey A AU - Aldemir, Tunc AD - Los Alamos National Laboratory, XCP-7, MS P365, Los Alamos, New Mexico 87545 bledsoekc@ornl.gov Y1 - 2011/10// PY - 2011 DA - Oct 2011 SP - 208 EP - 221 PB - American Nuclear Society, Inc., 555 N. Kensington Ave. La Grange Park IL 60525 United States VL - 169 IS - 2 SN - 0029-5639, 0029-5639 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) KW - Mathematical models KW - Transport KW - Inverse KW - Algorithms KW - Run time (computers) KW - Differential geometry KW - Stochasticity KW - Evolution UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1671329065?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Science+and+Engineering&rft.atitle=Application+of+the+Differential+Evolution+Method+to+Solving+Inverse+Transport+Problems&rft.au=Bledsoe%2C+Keith+C%3BFavorite%2C+Jeffrey+A%3BAldemir%2C+Tunc&rft.aulast=Bledsoe&rft.aufirst=Keith&rft.date=2011-10-01&rft.volume=169&rft.issue=2&rft.spage=208&rft.isbn=&rft.btitle=&rft.title=Nuclear+Science+and+Engineering&rft.issn=00295639&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-04-01 N1 - Last updated - 2015-04-09 ER - TY - JOUR T1 - The UAS-Seamonster Project; a glacier sensor network on the Lemon Creek and Mendenhall Glaciers inspired by the 1958-59 International Geophysical Year (IGY) and the Juneau Icefield Research Program (JIRP) AN - 1473591469; 2013-005481 AB - The South East Alaska MOnitoring Network for Science, Telecommunications, Education, and Research (SEAMONSTER) is a collaborative environmental research program centered at the University of Alaska Southeast in Juneau. Begun in 2006 with inspiration from JIRP, 1958-59 IGY, and support from NASA, a sensor network was established on the Lemon Creek and Mendenhall Glaciers with weather stations on Douglas Island (Eaglecrest Ski Area) and atop Mt Roberts (Mt Roberts Tram). Glacier baseline data collected in 2007 from Lemon Creek Glacier watershed, was enhanced by high-precision GPS surveys of glacier motion in 2008. In 2009 and 2010 Lemon Creek glacier lake outburst events and their subglacial drainages were captured by this monitoring system. Additional funding from NSF and the NOAA-ISETCSC has enabled research expansion from studies of glacier mass balance and watershed hydrology to linkage with connecting estuarine and North Pacific marine nutrient cycling systems, allowing more undergraduate student involvement in the project. Monitoring of Mendenhall Glacier terminus retreat and proglacial lake expansion continues with cooperation from the USFS Juneau Ranger District and Mendenhall Glacier Visitor center. SEAMONSTER project involvement with the Juneau Icefield Research Program increased in 2010 with the installation of a met station, solar power system, and data modem for real-time data delivery. A rare mid-summer (July 18-21, 2011) jokulhlaup initiated from Suicide Basin was captured at Mendenhall Falls by SEAMONSTER remote cameras and USGS Mendendhall Lake and River gages, as it released up to approximately 453 cms meltwater, subglacially under Mendenhall Glacier and into Mendenhall Lake. Rise in lake level was 1.8m over the 3 day period and generated moderate flood stage conditions in residential areas of the upper Mendenhall Valley. This large volume event was only the second and most severe jokulhlaup measured by instruments in this glacierized watershed. JF - Abstracts with Programs - Geological Society of America AU - Heavner, Matthew J AU - Connor, Cathy AU - Sauer, D AU - Kugler, Nathaniel W AU - Hood, Eran AU - Fatland, Dennis R AU - Anonymous Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 237 PB - Geological Society of America (GSA), Boulder, CO VL - 43 IS - 5 SN - 0016-7592, 0016-7592 KW - United States KW - Quaternary KW - glaciers KW - Juneau ice field KW - information management KW - data management KW - Cenozoic KW - Juneau Icefield Research Program KW - ice KW - Lemon Creek Glacier KW - Alaska KW - glacial geology KW - Mendenhall Glacier KW - UAS-Seamonster Project KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1473591469?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+School+Leadership&rft.atitle=Principals%27+Socialization%3A+Whose+Responsibility+Is+It%3F&rft.au=Bengtson%2C+Ed&rft.aulast=Bengtson&rft.aufirst=Ed&rft.date=2014-07-01&rft.volume=24&rft.issue=4&rft.spage=725&rft.isbn=&rft.btitle=&rft.title=Journal+of+School+Leadership&rft.issn=10526846&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2014-01-02 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Alaska; Cenozoic; data management; glacial geology; glaciers; ice; information management; Juneau ice field; Juneau Icefield Research Program; Lemon Creek Glacier; Mendenhall Glacier; Quaternary; UAS-Seamonster Project; United States ER - TY - JOUR T1 - Approaches to calibration of quantitative elemental analysis with laser-induced breakdown spectroscopy (LIBS) AN - 1473590859; 2013-005465 AB - Laser-induced breakdown spectroscopy (LIBS) is well-suited to both bench- and microscope-based laboratory studies as well as field work using backpack instruments. However, geological applications that require quantitative elemental analyses have been limited by the magnitude of matrix effects, for which there are as yet no theoretical treatment. The classical approach to LIBS calibration that relates emission peak intensity/area to concentration produces only qualitative results. However, multivariate statistical techniques provide powerful strategies for quantitative analyses, analogous to the empirical matrix corrections used by Bence and Albee for the electron microprobe. Partial least-squares (PLS) techniques have been successful in geological studies where only small data sets of like samples are employed. For example, root mean square errors on a suite of sedimentary rock compositions compared with their average compositions in wt.% oxide are 51.89 + or - 1.88 for SiO (sub 2) , 13.54 + or - 0.57 for Al (sub 2) O (sub 3) , 1.10 + or - 0.37 for TiO (sub 2) , 7.68 + or - 1.21 for Fe (sub 2) O (sub 3) T, 5.10 + or - 1.00 for MgO, 0.24 + or - 0.07 for MnO, 3.87 + or - 0.64 for CaO, 2.07 + or - 0.46 for K (sub 2) O, 4.68 + or - 0.71 for Na (sub 2) O, and 0.20 + or - 0.06 for P (sub 2) O (sub 5) . Wider application of PLS to LIBS of unknowns in field settings is limited by its dependence on matching the training set (used to calibrate the prediction model) to the unknowns. To this end, acquisition of a publicly-accessible calibration database of >2000 samples spanning a diverse range of rock types and compositions is in progress. Moreover, PLS uses all the channels of each spectrum, some of which contribute noise and error to the results. So we are pioneering the application of high-dimensional shrunken regression techniques that provide alternatives to PLS, combining the ability to shrink the number of input variables with automatic selection of similar training samples. These methods have the potential to reduce errors far beyond those for PLS and build more generalized models. For example, the Lasso method provides a sparser, more robust prediction model as an alternative to PLS with comparable errors. JF - Abstracts with Programs - Geological Society of America AU - Dyar, M Darby AU - Carmosino, Marco L AU - Speicher, Elly A AU - Ozanne, Marie V AU - Clegg, Sam M AU - Wiens, Roger C AU - Anonymous Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 234 PB - Geological Society of America (GSA), Boulder, CO VL - 43 IS - 5 SN - 0016-7592, 0016-7592 KW - technology KW - sedimentary rocks KW - LIBS spectra KW - calibration KW - spectra KW - geochemistry KW - emission spectra KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1473590859?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Approaches+to+calibration+of+quantitative+elemental+analysis+with+laser-induced+breakdown+spectroscopy+%28LIBS%29&rft.au=Dyar%2C+M+Darby%3BCarmosino%2C+Marco+L%3BSpeicher%2C+Elly+A%3BOzanne%2C+Marie+V%3BClegg%2C+Sam+M%3BWiens%2C+Roger+C%3BAnonymous&rft.aulast=Dyar&rft.aufirst=M&rft.date=2011-10-01&rft.volume=43&rft.issue=5&rft.spage=234&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2014-01-02 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - calibration; emission spectra; geochemistry; LIBS spectra; sedimentary rocks; spectra; technology ER - TY - JOUR T1 - Vibration-induced slip in sheared granular layers and the micromechanics of dynamic earthquake triggering AN - 1464883708; 2013-094575 AB - We perform 2D Molecular Dynamics simulations of sheared granular layers in the presence of applied vibration. A primary goal is to understand the physics of dynamic earthquake triggering. We adopt a mesoscopic measure of non-affine deformation for characterizing the granular dynamics during slip without or with applied vibration. Our results show that the onset of non-affine strains correlates with the onset of slip and appears earlier in the presence of vibration than in its absence, in agreement with the evidence for triggered slip. Copyright Europhysics Letters Association JF - Europhysics Letters AU - Griffa, Michele AU - Daub, E G AU - Guyer, R A AU - Johnson, P A AU - Marone, C AU - Carmeliet, J Y1 - 2011/10// PY - 2011 DA - October 2011 EP - paper 14001 PB - Les Ed. de Physique, Les Ulis VL - 96 IS - 1 SN - 0295-5075, 0295-5075 KW - precursors KW - strain KW - deformation KW - simulation KW - layered materials KW - two-dimensional models KW - granular materials KW - dynamics KW - shear KW - vibration KW - molecular dynamics KW - earthquakes KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464883708?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Europhysics+Letters&rft.atitle=Vibration-induced+slip+in+sheared+granular+layers+and+the+micromechanics+of+dynamic+earthquake+triggering&rft.au=Griffa%2C+Michele%3BDaub%2C+E+G%3BGuyer%2C+R+A%3BJohnson%2C+P+A%3BMarone%2C+C%3BCarmeliet%2C+J&rft.aulast=Griffa&rft.aufirst=Michele&rft.date=2011-10-01&rft.volume=96&rft.issue=1&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Europhysics+Letters&rft.issn=02955075&rft_id=info:doi/10.1209%2F0295-5075%2F96%2F14001 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2013-01-01 N1 - SuppNotes - Based on Publisher-supplied data N1 - Last updated - 2013-12-05 N1 - CODEN - JOPQAG N1 - SubjectsTermNotLitGenreText - deformation; dynamics; earthquakes; granular materials; layered materials; molecular dynamics; precursors; shear; simulation; strain; two-dimensional models; vibration DO - http://dx.doi.org/10.1209/0295-5075/96/14001 ER - TY - JOUR T1 - A numerical model for contamination transport in groundwater AN - 1312832711; 2013-020437 AB - With large increases in population and changes in agricultural practices in recent history, pollutants are threatening groundwater quality. The objective of this research is to provide insight to minimize future contamination of aquifers. We have developed a computational model for contamination transport from a point source within an aquifer contained in fractured bedrock. The simulations use a finite difference scheme to solve the advection-dispersion equation for an arbitrary number of non-interacting contaminates within the groundwater system. These models are used to predict contamination in monitoring wells at the University of Northern Iowa and have applications in both research and undergraduate instruction. JF - Abstracts with Programs - Geological Society of America AU - Even, Matthew J AU - Even, Wesley AU - Roth, M W AU - Iqbal, Mohammad AU - Anonymous Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 119 PB - Geological Society of America (GSA), Boulder, CO VL - 43 IS - 5 SN - 0016-7592, 0016-7592 KW - fractured materials KW - bedrock KW - numerical models KW - agriculture KW - pollution KW - observation wells KW - ground water KW - aquifers KW - models KW - transport KW - future KW - water wells KW - water pollution KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312832711?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=A+numerical+model+for+contamination+transport+in+groundwater&rft.au=Even%2C+Matthew+J%3BEven%2C+Wesley%3BRoth%2C+M+W%3BIqbal%2C+Mohammad%3BAnonymous&rft.aulast=Even&rft.aufirst=Matthew&rft.date=2011-10-01&rft.volume=43&rft.issue=5&rft.spage=119&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-02-28 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - agriculture; aquifers; bedrock; fractured materials; future; ground water; models; numerical models; observation wells; pollution; transport; water pollution; water wells ER - TY - JOUR T1 - CO (sub 2) fate in geological reservoirs with theoretical constraints on system D (super 13) C(CO (sub 2) ) and CO (sub 2) / (super 3) He AN - 1124738601; 2012-095392 AB - CO (sub 2) is an important greenhouse gas in the Earth system. The fate of CO (sub 2) gas in geological reservoirs is a major concern in many environmental and geochemical issues such as global warming, CO (sub 2) sequestration, and ocean acidification. Using the ratio of CO (sub 2) / (super 3) He combined with delta (super 13) C of CO (sub 2) gas to trace CO (sub 2) fate has been proposed to be an applicable geochemical tool. However, it remains vague under what conditions this geochemical tracer system is effective; it is still uncertain how to determine the initial ratio of CO (sub 2) / (super 3) He which is needed to calculate the proportion of CO (sub 2) loss relative to the total system. In this presentation we develop a new method based on simple mass balance and Rayleigh fractionation, derive analytical equations to simulate differentiation of CO (sub 2) and (super 3) He, and compute CO (sub 2) loss due to dissolution of CO (sub 2) into groundwater and precipitation of calcite. The uncertain initial ratio of CO (sub 2) / (super 3) He can introduce large errors into calculation of CO (sub 2) loss. Spatial heterogeneous distributions of CO (sub 2) and 3He and mixing of Helium from different sources have significant influences on the effectiveness of the tracer system. Finally, an example is given to apply our methodology and the limits of applicability are discussed for the system of CO (sub 2) / (super 3) He combined with d (super 13) C of CO (sub 2) gas. JF - Abstracts with Programs - Geological Society of America AU - Deng, Hailin AU - Stauffer, Philip H AU - Dai, Zhenxue AU - Carey, J William AU - Lichtner, Peter AU - Anonymous Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 59 PB - Geological Society of America (GSA), Boulder, CO VL - 43 IS - 5 SN - 0016-7592, 0016-7592 KW - carbon sequestration KW - isotopes KW - isotope ratios KW - C-13/C-12 KW - He-3 KW - stable isotopes KW - ground water KW - gases KW - carbon dioxide KW - calcite KW - errors KW - precipitation KW - noble gases KW - carbon KW - tracers KW - helium KW - applications KW - geochemistry KW - carbonates KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1124738601?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=CO+%28sub+2%29+fate+in+geological+reservoirs+with+theoretical+constraints+on+system+D+%28super+13%29+C%28CO+%28sub+2%29+%29+and+CO+%28sub+2%29+%2F+%28super+3%29+He&rft.au=Deng%2C+Hailin%3BStauffer%2C+Philip+H%3BDai%2C+Zhenxue%3BCarey%2C+J+William%3BLichtner%2C+Peter%3BAnonymous&rft.aulast=Deng&rft.aufirst=Hailin&rft.date=2011-10-01&rft.volume=43&rft.issue=5&rft.spage=59&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - PubXState - CO N1 - Last updated - 2012-11-01 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - applications; C-13/C-12; calcite; carbon; carbon dioxide; carbon sequestration; carbonates; errors; gases; geochemistry; ground water; He-3; helium; isotope ratios; isotopes; noble gases; precipitation; stable isotopes; tracers ER - TY - JOUR T1 - Developing an advanced simulation capability for environmental management applications AN - 1015460569; 2012-049372 AB - Critical investments were made in many areas during the course of developing a safety case and License Application for the Yucca Mountain Project, and these investments are likely to endure beyond the Project itself. An example of an activity catalyzed by these investments is the Department of Energy Office of Environmental Management's (DOE-EM) Advanced Simulation Capability for Environmental Management (ASCEM) project. ASCEM is a state-of-the-art scientific tool and approach for integrating data and scientific understanding to enable prediction of contaminant fate and transport in natural and engineered systems. The ASCEM modeling initiative is developing an open-source, High Performance Computing (HPC) modeling system and user interface analytical platform supporting model setup, parameter estimation, data management, visualization, and uncertainty quantification activities. The ASCEM toolset also includes the next generation of performance assessment tools to better understand the risks of nuclear waste disposal and decommissioning of nuclear facilities across the EM complex. The initiative leverages the considerable scientific investment that has already been made both within and outside of DOE-EM, including within the Yucca Mountain Project, in the areas of subsurface geosciences, modeling and simulation, and environmental remediation. Through integration of these efforts, ASCEM will facilitate the rapid development of more accurate site models, allow for predictive simulation of proposed remediation methods, and prevent implementation of overly conservative and unnecessarily expensive remediation strategies. It is likely that ASCEM can become an effective platform for applications beyond DOE-EM, including the next generation of process and PA models for nuclear waste repositories. In this way, the original investments in the Yucca Mountain models can "come full circle" to provide an advanced repository modeling capability for the future. JF - Abstracts with Programs - Geological Society of America AU - Robinson, Bruce AU - Dixon, Paul AU - Anonymous Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 197 PB - Geological Society of America (GSA), Boulder, CO VL - 43 IS - 5 SN - 0016-7592, 0016-7592 KW - United States KW - risk management KW - waste disposal sites KW - Nye County Nevada KW - environmental analysis KW - remediation KW - radioactive waste KW - environmental management KW - case studies KW - waste management KW - land management KW - risk assessment KW - waste disposal KW - Yucca Mountain KW - Nevada KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1015460569?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Developing+an+advanced+simulation+capability+for+environmental+management+applications&rft.au=Robinson%2C+Bruce%3BDixon%2C+Paul%3BAnonymous&rft.aulast=Robinson&rft.aufirst=Bruce&rft.date=2011-10-01&rft.volume=43&rft.issue=5&rft.spage=197&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - http://gsa.confex.com/gsa/2011AM/finalprogram/abstract_192732.htm LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - PubXState - CO N1 - Last updated - 2012-06-07 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - case studies; environmental analysis; environmental management; land management; Nevada; Nye County Nevada; radioactive waste; remediation; risk assessment; risk management; United States; waste disposal; waste disposal sites; waste management; Yucca Mountain ER - TY - JOUR T1 - The past Yucca Mountain Project; advancing science and technology for the future; was it worth the cost? AN - 1011394186; 2012-045308 AB - What happens when a major program shuts down? Infrastructure may be mothballed, computers sold, and records shipped off to storage, but the knowledge gained and expertise developed by the individual scientists and engineers often finds application in diverse new areas. The scientists and engineers who participated in more than thirty years of scientific investigation at Yucca Mountain, Nevada, are now applying their skills to other fields of study such as: oil and gas exploration, carbon sequestration, geothermal energy, used nuclear fuel studies, seismic and volcanic hazard analysis, and groundwater flow modeling. Did the knowledge and experience gained as part of the Yucca Mountain program inform or jump start new investigations? Are there other uses for the detailed data sets collected during characterization? Can the value of that knowledge, experience, and data be quantified? If so, what was the return on investment for the more than $1.5 billion spent directly on scientific studies? As the federal government reevaluates its priorities and investments in basic science programs, policy makers would be wise to consider the benefits derived from long-term studies and programs. The Yucca Mountain Program provides an excellent case study of those benefits. JF - Abstracts with Programs - Geological Society of America AU - Newbury, Claudia M AU - Simmons, Ardyth M AU - Anonymous Y1 - 2011/10// PY - 2011 DA - October 2011 SP - 196 PB - Geological Society of America (GSA), Boulder, CO VL - 43 IS - 5 SN - 0016-7592, 0016-7592 KW - United States KW - programs KW - risk management KW - site exploration KW - waste disposal sites KW - Nye County Nevada KW - environmental analysis KW - cost KW - radioactive waste KW - environmental management KW - case studies KW - waste management KW - mitigation KW - land management KW - risk assessment KW - waste disposal KW - Yucca Mountain KW - Nevada KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1011394186?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=The+past+Yucca+Mountain+Project%3B+advancing+science+and+technology+for+the+future%3B+was+it+worth+the+cost%3F&rft.au=Newbury%2C+Claudia+M%3BSimmons%2C+Ardyth+M%3BAnonymous&rft.aulast=Newbury&rft.aufirst=Claudia&rft.date=2011-10-01&rft.volume=43&rft.issue=5&rft.spage=196&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ L2 - http://gsa.confex.com/gsa/2011AM/finalprogram/abstract_192945.htm LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - PubXState - CO N1 - Last updated - 2012-06-07 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - case studies; cost; environmental analysis; environmental management; land management; mitigation; Nevada; Nye County Nevada; programs; radioactive waste; risk assessment; risk management; site exploration; United States; waste disposal; waste disposal sites; waste management; Yucca Mountain ER - TY - JOUR T1 - The role of advective heat transport in talik development beneath lakes and ponds in discontinuous permafrost AN - 912919384; 16006891 AB - Subpermafrost groundwater flow results in significantly thinner permafrost Permafrost under lakes in the subarctic can completely thaw in a few decades Coupled hydrological-thermal process significantly increase permafrost thawing Regions of warm, thin, discontinuous permafrost have been observed to be experiencing rapid changes in lake and pond dynamics in recent decades. Even though surface water and groundwater interactions are thought to play a significant role in heat transport in these regions, the effect of these interactions on permafrost remains largely unquantified. In order to examine the influence of groundwater flow on permafrost dynamics, we modeled the development of a sub-lake talik under permafrost conditions similar to those observed in the southern-central Seward Peninsula region of Alaska using a numerical solution that couples heat transport and groundwater flow, including the effect of water phase changes on soil permeability and latent heat content. A comparison of model simulations, with and without near surface subpermafrost groundwater flow, indicates that stable permafrost thicknesses are 2 to 5 times greater in the absence of groundwater flow. Simulations examining the thermal influence of lakes on underlying permafrost suggest that a through-going talik can develop in a matter of decades and that the incorporation of advective heat transport reduces the time to complete loss of ice beneath the lake by half, relative to heat transport by conduction alone. This work presents the first quantitative assessment of the rates of sub-lake permafrost response to thermal disturbances, such as talik development, in systems with near-surface groundwater flow. The results highlight the importance of coupled thermal and hydrologic processes on discontinuous permafrost dynamics. JF - Geophysical Research Letters AU - Rowland, J C AU - Travis, B J AU - Wilson, C J AD - Earth and Environmental Sciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA Y1 - 2011/09/13/ PY - 2011 DA - 2011 Sep 13 PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 38 IS - 17 SN - 0094-8276, 0094-8276 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - 0702 Cryosphere: Permafrost KW - 0746 Cryosphere: Lakes KW - 0748 Cryosphere: Ponds KW - 0774 Cryosphere: Dynamics KW - 0798 Cryosphere: Modeling KW - advective heat transport KW - lakes KW - modeling KW - permafrost KW - subarctic KW - talik KW - Soil permeability KW - Permafrost KW - Freshwater KW - Latent heat KW - Ponds KW - Thawing KW - Permeability KW - Hydrologic processes KW - Lakes KW - Hydrologic Models KW - Assessments KW - Ice drift KW - Heat transport KW - USA, Alaska KW - USA, Alaska, Seward Peninsula KW - Groundwater flow KW - Heat content KW - Lake ice KW - Surface-groundwater Relations KW - Numerical simulations KW - Heat KW - Groundwater KW - Thaws KW - Groundwater Movement KW - AQ 00001:Water Resources and Supplies KW - SW 0850:Lakes KW - Q2 09171:Dynamics of lakes and rivers KW - M2 556.34:Groundwater Flow (556.34) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/912919384?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=The+role+of+advective+heat+transport+in+talik+development+beneath+lakes+and+ponds+in+discontinuous+permafrost&rft.au=Rowland%2C+J+C%3BTravis%2C+B+J%3BWilson%2C+C+J&rft.aulast=Rowland&rft.aufirst=J&rft.date=2011-09-13&rft.volume=38&rft.issue=17&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2011GL048497 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-12-01 N1 - Number of references - 35 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Permeability; Lake ice; Lakes; Ice drift; Permafrost; Heat content; Ponds; Thawing; Heat transport; Soil permeability; Hydrologic processes; Numerical simulations; Groundwater flow; Thaws; Latent heat; Hydrologic Models; Assessments; Surface-groundwater Relations; Heat; Groundwater; Groundwater Movement; USA, Alaska; USA, Alaska, Seward Peninsula; Freshwater DO - http://dx.doi.org/10.1029/2011GL048497 ER - TY - JOUR T1 - The dangers of sparse sampling for the quantification of margin and uncertainty AN - 879478917; 15128042 AB - Activities such as global sensitivity analysis, statistical effect screening, uncertainty propagation, or model calibration have become integral to the Verification and Validation (V&V) of numerical models and computer simulations. One of the goals of V&V is to assess prediction accuracy and uncertainty, which feeds directly into reliability analysis or the Quantification of Margin and Uncertainty (QMU) of engineered systems. Because these analyses involve multiple runs of a computer code, they can rapidly become computationally expensive. An alternative to Monte Carlo-like sampling is to combine a design of computer experiments to meta-modeling, and replace the potentially expensive computer simulation by a fast-running emulator. The surrogate can then be used to estimate sensitivities, propagate uncertainty, and calibrate model parameters at a fraction of the cost it would take to wrap a sampling algorithm or optimization solver around the physics-based code. Doing so, however, offers the risk to develop an incorrect emulator that erroneously approximates the "true-but-unknown" sensitivities of the physics-based code. We demonstrate the extent to which this occurs when Gaussian Process Modeling (GPM) emulators are trained in high-dimensional spaces using too-sparsely populated designs-of-experiments. Our illustration analyzes a variant of the Rosenbrock function in which several effects are made statistically insignificant while others are strongly coupled, therefore, mimicking a situation that is often encountered in practice. In this example, using a combination of GPM emulator and design-of-experiments leads to an incorrect approximation of the function. A mathematical proof of the origin of the problem is proposed. The adverse effects that too-sparsely populated designs may produce are discussed for the coverage of the design space, estimation of sensitivities, and calibration of parameters. This work attempts to raise awareness to the potential dangers of not allocating enough resources when exploring a design space to develop fast-running emulators. JF - Reliability Engineering & System Safety AU - Hemez, Francois M AU - Atamturktur, Sezer AD - Los Alamos National Laboratory, XTD-3, Mail Stop T087, Los Alamos, NM 87545, USA Y1 - 2011/09// PY - 2011 DA - Sep 2011 SP - 1220 EP - 1231 PB - Elsevier Science, The Boulevard Kidlington Oxford OX5 1GB UK VL - 96 IS - 9 SN - 0951-8320, 0951-8320 KW - Risk Abstracts KW - Sparse sampling KW - Gaussian process modeling KW - Statistical emulator KW - Sensitivity KW - Mathematical models KW - safety engineering KW - sensitivity analysis KW - Simulation KW - Side effects KW - Feeds KW - R2 23010:General: Models, forecasting UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/879478917?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Reliability+Engineering+%26+System+Safety&rft.atitle=The+dangers+of+sparse+sampling+for+the+quantification+of+margin+and+uncertainty&rft.au=Hemez%2C+Francois+M%3BAtamturktur%2C+Sezer&rft.aulast=Hemez&rft.aufirst=Francois&rft.date=2011-09-01&rft.volume=96&rft.issue=9&rft.spage=1220&rft.isbn=&rft.btitle=&rft.title=Reliability+Engineering+%26+System+Safety&rft.issn=09518320&rft_id=info:doi/10.1016%2Fj.ress.2011.02.015 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-07-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Sensitivity; safety engineering; Mathematical models; sensitivity analysis; Simulation; Side effects; Feeds DO - http://dx.doi.org/10.1016/j.ress.2011.02.015 ER - TY - JOUR T1 - Core materials development for the fuel cycle R&; D program AN - 918046440; 15721586 AB - The Fuel Cycle Research and Development program is investigating methods of burning minor actinides in a transmutation fuel. One of the challenges of achieving this goal is to develop fuels capable of reaching extreme burnup levels (e.g. 40%). To achieve such high burnup levels' fast reactor core materials (cladding and duct) must be able to withstand very high doses (300 dpa design goal) while in contact with the coolant and the fuel. Thus, these materials must withstand radiation effects that promote low temperature embrittlement, radiation induced segregation, high temperature helium embrittlement, swelling, accelerated creep, corrosion with the coolant, and chemical interaction with the fuel (FCCI). To develop and qualify materials to a total fluence greater than 200 dpa requires development of advanced alloys and irradiations in fast reactors to test these alloys. Test specimens of ferritic/martensitic alloys (T91/HT-9) previously irradiated in the FFTF reactor up to 210 dpa at a temperature range of 350-750 degree C are presently being tested. This includes analysis of a duct made of HT-9 after irradiation to a total dose of 155 dpa at temperatures from 370 to 510 degree C. Compact tension, charpy and tensile specimens have been machined from this duct and mechanical testing as well as SANS and Mossbauer spectroscopy are currently being performed. Initial results from compression testing and Charpy testing reveal a strong increase in yield stress ([approx]400 MPa) and a large increase in DBTT (up to 230 degree C) for specimens irradiated at 383 degree C to a dose of 28 dpa. Less hardening and a smaller increase in DBTT was observed for specimens irradiated at higher temperatures up to 500 degree C. Advanced radiation tolerant materials are also being developed to enable the desired extreme fuel burnup levels. Specifically, coatings are being developed to minimize FCCI, and research is underway to fabricate large heats of radiation tolerant oxide dispersion steels with homogeneous oxide dispersions. JF - Journal of Nuclear Materials AU - Maloy, SA AU - Toloczko, M AU - Cole, J AU - Byun, T S Y1 - 2011/08/31/ PY - 2011 DA - 2011 Aug 31 SP - 302 EP - 305 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 415 IS - 3 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Duplex stainless steels KW - Ferritic stainless steels KW - Martensitic stainless steels KW - HT9 KW - Nuclear reactors KW - Fuels KW - Irradiation KW - Nuclear fuels KW - Temperature KW - Alloys KW - Stress KW - Chemical interactions KW - high temperature KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/918046440?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Core+materials+development+for+the+fuel+cycle+R%26amp%3B%3B+D+program&rft.au=Maloy%2C+SA%3BToloczko%2C+M%3BCole%2C+J%3BByun%2C+T+S&rft.aulast=Maloy&rft.aufirst=SA&rft.date=2011-08-31&rft.volume=415&rft.issue=3&rft.spage=302&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2011.04.027 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-01-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Nuclear reactors; Irradiation; Fuels; Nuclear fuels; Temperature; Stress; Alloys; Chemical interactions; high temperature DO - http://dx.doi.org/10.1016/j.jnucmat.2011.04.027 ER - TY - CPAPER T1 - How do trees die? Insights into hydraulic failure and carbon starvation hypotheses T2 - 96th Annual Meeting of the Ecological Society of America (ESA 2011) AN - 1313025961; 6099631 JF - 96th Annual Meeting of the Ecological Society of America (ESA 2011) AU - Sevanto, S AU - McDowell, N AU - Dickman, L AU - Meyer, C AU - Pangle, R AU - Hirth, K AU - Pockman, W Y1 - 2011/08/07/ PY - 2011 DA - 2011 Aug 07 KW - Hydraulics KW - Trees KW - Carbon KW - Starvation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313025961?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=96th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2011%29&rft.atitle=How+do+trees+die%3F+Insights+into+hydraulic+failure+and+carbon+starvation+hypotheses&rft.au=Sevanto%2C+S%3BMcDowell%2C+N%3BDickman%2C+L%3BMeyer%2C+C%3BPangle%2C+R%3BHirth%2C+K%3BPockman%2C+W&rft.aulast=Sevanto&rft.aufirst=S&rft.date=2011-08-07&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=96th+Annual+Meeting+of+the+Ecological+Society+of+America+%28ESA+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://www.esa.org/austin/info/2011_ESA_Annual_Meeting_%28Austin%29_program.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Translation of field tracer-test results into bounding predictions of matrix diffusion in the shallow subsurface at Idaho National Laboratory, USA TT - Transposition de resultats de tracages et incidences AN - 911160114; 16009515 AB - Matrix-diffusion parameters deduced from an infiltration tracer test at Idaho National Laboratory (INL), USA, are combined with other site information in an analysis involving two dimensionless lumped parameters to assess the effects of matrix diffusion on contaminant transport at the INL over longer distance and time scales than were evaluated in the test. Matrix diffusion was interrogated in the test by comparing, in three different observation wells, the breakthrough curves of two simultaneously injected nonsorbing solutes that have different diffusion coefficients. The matrix-diffusion parameters deduced from the different breakthrough curves were in good agreement, suggesting that the parameters may be broadly applicable at the INL. With this in mind, the uncertainties in the individual parameters that make up the two lumped parameters were estimated, and the resulting ranges of parameter values were used to assess matrix diffusion over larger scales. Assessments of the effects of flow transients, spatial heterogeneity in transport parameters, and sorption on solute transport in the shallow subsurface flow system were also conducted. The methods presented here should be generally applicable to other settings for making bounding assessments of the effects of matrix diffusion while honoring the information obtained from tracer tests and other supporting data.Original Abstract: Les parametres de matrice de diffusion deduits d'un test de tracage par infiltration au Idaho National Laboratory (INL), USA, sont combines avec d'autres donnees de terrain dans une analyse comportant deux parametres lies sans dimension, pour evaluer les effets de la diffusion matricielle sur le transport de polluants sur des distances et des temps superieurs a ceux du test. La diffusion matricielle a ete testee en comparant, dans trois puits d'observation differents, les courbes de percee de deux solutes non adsorbables de coefficients de diffusion differents injectes simultanement. Les parametres de matrice deduits des differentes courbes de percee etaient en accord, suggerant que les parametres peuvent etre en grand appliques au INL. En se rappelant qu'on a estime les incertitudes sur chacun des deux parametres lies, et que les valeurs resultantes ont ete utilisees pour evaluer la diffusion matricielle a plus grande echelle. On a egalement considere les effets de flux en regime transitoire, l'heterogeneite spatiale des parametres d'ecoulement, la sorption du solute dans le systeme d'ecoulement superficiel. Les methodes presentees ici devraient de facon generale etre applicables dans d'autres cadres pour evaluer l'incidence de la diffusion matricielle, en prenant en compte les informations tirees des tracages et autres donnees utiles. JF - Hydrogeology Journal AU - Reimus, Paul W AU - Duke, Catherine L AU - Roback, Robert C AD - Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM, 87544, USA, preimus@lanl.gov Y1 - 2011/08// PY - 2011 DA - August 2011 SP - 1021 EP - 1037 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 19 IS - 5 SN - 1431-2174, 1431-2174 KW - Environment Abstracts; Water Resources Abstracts; Aqualine Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Prediction KW - Pollution dispersion KW - Observation Wells KW - Tracers KW - Solutes KW - Assessments KW - Diffusion KW - Heterogeneity KW - Testing Procedures KW - Sorption KW - Laboratories KW - USA, Idaho KW - Translations KW - Infiltration KW - Diffusion coefficients KW - Spatial Heterogeneity KW - AQ 00001:Water Resources and Supplies KW - SW 3050:Ultimate disposal of wastes KW - ENA 02:Toxicology & Environmental Safety KW - Q2 09126:Sociology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/911160114?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Hydrogeology+Journal&rft.atitle=Translation+of+field+tracer-test+results+into+bounding+predictions+of+matrix+diffusion+in+the+shallow+subsurface+at+Idaho+National+Laboratory%2C+USA&rft.au=Reimus%2C+Paul+W%3BDuke%2C+Catherine+L%3BRoback%2C+Robert+C&rft.aulast=Reimus&rft.aufirst=Paul&rft.date=2011-08-01&rft.volume=19&rft.issue=5&rft.spage=1021&rft.isbn=&rft.btitle=&rft.title=Hydrogeology+Journal&rft.issn=14312174&rft_id=info:doi/10.1007%2Fs10040-010-0685-y LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-12-01 N1 - Last updated - 2016-04-13 N1 - SubjectsTermNotLitGenreText - Sorption; Solutes; Tracers; Translations; Pollution dispersion; Diffusion coefficients; Spatial Heterogeneity; Prediction; Infiltration; Diffusion; Testing Procedures; Observation Wells; Assessments; Laboratories; Heterogeneity; USA, Idaho DO - http://dx.doi.org/10.1007/s10040-010-0685-y ER - TY - JOUR T1 - Coupling of protein and environment fluctuations AN - 907162373; 15127800 AB - We review the concepts of protein dynamics developed over the last 35 years and extend applications of the unified model of protein dynamics to heat flow and spatial fluctuations in hydrated myoglobin (Mb) powders. Differential scanning calorimetry (DSC) and incoherent neutron scattering (INS) data on hydration Mb powders are explained by the temperature-dependence of the hydration-shell beta sub(h) process measured by dielectric relaxation spectroscopy (DRS). The unified model explains the temperature dependence of DSC and INS data as a kinetic effect due to a fixed experimental time window and a broad distribution of hydration-shell beta sub(h) fluctuation rates. We review the slaving of large scale protein motions to the bulk solvent alpha process, and the metastability of Mb molecules in glass forming bulk solvent at low temperatures. This article is part of a Special Issue entitled: "Protein Dynamics: Experimental and Computational Approaches". JF - Biochimica et Biophysica Acta: Proteins and Proteomics AU - Young, R D AU - Fenimore, P W AD - Center for Biological Physics, Arizona State University, PO Box 871604, Tempe AZ 85287 USA, paulf@lanl.gov Y1 - 2011/08// PY - 2011 DA - August 2011 SP - 916 EP - 921 PB - Elsevier Science, The Boulevard Kidlington Oxford OX5 1GB UK VL - 1814 IS - 8 SN - 1570-9639, 1570-9639 KW - Biotechnology and Bioengineering Abstracts; ASFA 1: Biological Sciences & Living Resources KW - Protein dynamics KW - Protein hydration KW - Temperature-dependence KW - Calorimetry KW - Neutron scattering KW - Hydration KW - Powder KW - Myoglobins KW - myoglobin KW - Spectroscopy KW - Models KW - Low temperature KW - Abiotic factors KW - Temperature effects KW - Data processing KW - Solvents KW - Heat flow KW - Computer applications KW - Heat KW - Kinetics KW - Reviews KW - Proteins KW - proteomics KW - Differential scanning calorimetry KW - Q1 08186:Physiology, biochemistry, biophysics KW - W 30960:Bioinformatics & Computer Applications UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907162373?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Biochimica+et+Biophysica+Acta%3A+Proteins+and+Proteomics&rft.atitle=Coupling+of+protein+and+environment+fluctuations&rft.au=Young%2C+R+D%3BFenimore%2C+P+W&rft.aulast=Young&rft.aufirst=R&rft.date=2011-08-01&rft.volume=1814&rft.issue=8&rft.spage=916&rft.isbn=&rft.btitle=&rft.title=Biochimica+et+Biophysica+Acta%3A+Proteins+and+Proteomics&rft.issn=15709639&rft_id=info:doi/10.1016%2Fj.bbapap.2011.05.005 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-11-01 N1 - Last updated - 2016-10-12 N1 - SubjectsTermNotLitGenreText - Hydration; Temperature effects; Low temperature; Myoglobins; Heat flow; Solvents; Proteins; Calorimetry; Abiotic factors; Powder; Data processing; myoglobin; Computer applications; Spectroscopy; Models; Neutron scattering; Heat; Reviews; Kinetics; proteomics; Differential scanning calorimetry DO - http://dx.doi.org/10.1016/j.bbapap.2011.05.005 ER - TY - JOUR T1 - The RDF virtual machine AN - 896164012; 201107784 AB - The Resource Description Framework (RDF) is a semantic network data model that is used to create machine-understandable descriptions of the world and is the basis of the Semantic Web. This article discusses the application of RDF to the representation of computer software and virtual computing machines. The Semantic Web is posited as not only a web of data, but also as a web of programs and processes. JF - Knowledge-Based Systems AU - Rodriguez, Marko A AD - T-7, Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87545, USA marko@markorodriguez.com Y1 - 2011/08// PY - 2011 DA - August 2011 SP - 890 EP - 903 PB - Elsevier Ltd, The Netherlands VL - 24 IS - 6 SN - 0950-7051, 0950-7051 KW - RDF KW - Web of data KW - Linked data KW - Virtual machines KW - Programming languages KW - Resource Description Framework KW - Linked Data KW - Semantic web KW - article KW - 14.14: COMMUNICATIONS AND INFORMATION TECHNOLOGY - SOFTWARE UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/896164012?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+School+Leadership&rft.atitle=Accountability+Narratives+of+Rural+School+Superintendents+and+Administrators%3A+Moving+from+Two-+to+Three-Level+Analysis&rft.au=O%27Rourke%2C+David%3BYlimaki%2C+Rose+M.&rft.aulast=O%27Rourke&rft.aufirst=David&rft.date=2014-05-01&rft.volume=24&rft.issue=3&rft.spage=537&rft.isbn=&rft.btitle=&rft.title=Journal+of+School+Leadership&rft.issn=10526846&rft_id=info:doi/ LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2011-10-03 N1 - Last updated - 2016-09-27 N1 - SubjectsTermNotLitGenreText - Semantic web; Programming languages; Linked Data; Resource Description Framework DO - http://dx.doi.org/10.1016/j.knosys.2011.04.004 ER - TY - JOUR T1 - Elastic softening of metamict titanite CaTiSiO (sub 5) ; radiation damage and annealing AN - 890670125; 2011-076467 AB - We have measured the elastic response of radiation-damaged titanite, CaTiSiO (sub 5) , as a function of thermal annealing. We estimate the bulk modulus of the damaged samples ( approximately 24% amorphous) to be 85 GPa, which is much softer than for undamaged crystalline titanite [131.4 GPa; Angel et al. (1999)]. Conversely, the lowest shear modulus of the radiation-damaged material is 52-58 GPa, which is harder that of the undamaged titanite, 46-52 GPa. The bulk and shear moduli of the radiation-damaged materials are close to those of thermal titanite glass, B (sub glass) nearly equal 75 GPa and G (sub glass) nearly equal 47 GPa, and are much smaller than expected based on other radiation-damaged materials such as zircon (ZrSiO (sub 4) ). Surprisingly, annealing of the damaged titanite in the range 600 5 volcanoes: Central America, Mexico, Kamchatka, Marianas, Cascades, Tonga and the Aleutians). Nearly all arc volcanoes are sourced with mafic magmas that contain 2-6 wt% H (sub 2) O. Moreover, the average for each arc varies even less, from 3.2 (for the Cascades) to 4.5 (for the Marianas), with an average for all seven arcs of 3.8 + or - 0.5 wt% H (sub 2) O. The narrow range and common average value for H (sub 2) O is in stark contrast to that for most other subduction tracers, such as Nb or Ba, which vary by orders of magnitude. A modulating process, either in the crust or mantle, is likely responsible for the restricted range in the H (sub 2) O contents of melt inclusions. One possibility is that melt inclusions reflects vapor saturation at the last storage depth prior to eruption. Magmas rise from the mantle with variable H (sub 2) O contents (> 4 wt%), start degassing at the depth of H (sub 2) O-saturation, and continue to degas up until the depth at which they stall. If the stalling depths were approximately 6 km, not atypical for storage depths beneath volcanoes, magmas would be saturated at approximately 4 wt% H (sub 2) O, and melt inclusions, which become sealed during ascent, would thus record < or = 4 wt% H (sub 2) O. Another possibility is that the melting process modulates water content in the melt such that magmas rise out of the mantle with approximately 4 wt% H (sub 2) O. A strong relationship between the water content of the source (H (sub 2) O (sub o) ) and the degree of melting (F) maintains nearly constant water contents in the melt for a restricted range in mantle temperature. Magmas with 3-4 wt% H (sub 2) O can be generated at 1230-1280 degrees C and 1.5 GPa for a wide range in F and H (sub 2) O (sub o) . Crust and mantle controls may dominate in different regions and may be distinguished from coupled trace element or CO (sub 2) variations. JF - Mineralogical Magazine AU - Plank, Terry AU - Kelley, Katherine A AU - Zimmer, Mindy AU - Hauri, Erik H AU - Wallace, Paul AU - Anonymous Y1 - 2011/06// PY - 2011 DA - June 2011 SP - 1648 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - United States KW - Russian Pacific region KW - Kamchatka Peninsula KW - Russian Federation KW - Tonga KW - melt inclusions KW - magma transport KW - melting KW - Commonwealth of Independent States KW - transport KW - inclusions KW - composition KW - Micronesia KW - water content KW - Asia KW - mafic magmas KW - water KW - Mariana Islands KW - Cascade Range KW - Mexico KW - island arcs KW - magmas KW - Oceania KW - volcanoes KW - fluid inclusions KW - Alaska KW - Polynesia KW - Aleutian Islands KW - Central America KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151912759?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Why+do+mafic+arc+magmas+contain+4+wt%25+water+on+average%3F&rft.au=Plank%2C+Terry%3BKelley%2C+Katherine+A%3BZimmer%2C+Mindy%3BHauri%2C+Erik+H%3BWallace%2C+Paul%3BAnonymous&rft.aulast=Plank&rft.aufirst=Terry&rft.date=2011-06-01&rft.volume=24&rft.issue=1&rft.spage=114&rft.isbn=&rft.btitle=&rft.title=Journal+of+School+Leadership&rft.issn=10526846&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/1584.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Last updated - 2012-11-15 N1 - SubjectsTermNotLitGenreText - Alaska; Aleutian Islands; Asia; Cascade Range; Central America; Commonwealth of Independent States; composition; fluid inclusions; inclusions; island arcs; Kamchatka Peninsula; mafic magmas; magma transport; magmas; Mariana Islands; melt inclusions; melting; Mexico; Micronesia; Oceania; Polynesia; Russian Federation; Russian Pacific region; Tonga; transport; United States; volcanoes; water; water content ER - TY - JOUR T1 - Calculations of asteroid impacts into deep and shallow water AN - 1030490262; 2012-068983 AB - Contrary to received opinion, ocean impacts of small (<500 m) asteroids do not produce tsunamis that lead to world-wide devastation. In fact the most dangerous features of ocean impacts, just as for land impacts, are the atmospheric effects. We present illustrative hydrodynamic calculations of impacts into both deep and shallow seas, and draw conclusions from a parameter study in which the size of the impactor and the depth of the sea are varied independently. For vertical impacts at 20 km/s, craters in the seafloor are produced when the water depth is less than about 5-7 times the asteroid diameter. Both the depth and the diameter of the transient crater scale with the asteroid diameter, so the volume of water excavated scales with the asteroid volume. About a third of the crater volume is vaporised, because the kinetic energy per unit mass of the asteroid is much larger than the latent heat of vaporisation of water. The vaporised water carries away a considerable fraction of the impact energy in an explosively expanding blast wave which is responsible for devastating local effects and may affect worldwide climate. Of the remaining energy, a substantial portion is used in the crown splash and the rebound jet that forms as the transient crater collapses. The collapse and rebound cycle leads to a propagating wave with a wavelength considerably shorter than classical tsunamis, being only about twice the diameter of the transient crater. Propagation of this wave is hindered somewhat because its amplitude is so large that it breaks in deep water and is strongly affected by the blast wave's perturbation of the atmosphere. Even if propagation were perfect, however, the volume of water delivered per metre of shoreline is less than was delivered by the Boxing Day 2004 tsunami for any impactor smaller than 500 m diameter in an ocean of 5 km depth or less. Near-field effects are dangerous for impactors of diameter 200 m or greater; hurricane-force winds can extend tens of kilometers from the impact point, and fallout from the initial splash can be extremely violent. There is some indication that near-field effects are more severe if the impact occurs in shallow water. Copyright 2010 Springer Basel AG JF - Pure and Applied Geophysics AU - Gisler, Galen AU - Weaver, Robert AU - Gittings, Michael AU - Satake, Kenji AU - Rabinovich, Alexander B AU - Kanoglu, Utku AU - Tinti, Stefano Y1 - 2011/06// PY - 2011 DA - June 2011 SP - 1187 EP - 1198 PB - Birkhaeuser, Basel VL - 168 IS - 6-7 SN - 0033-4553, 0033-4553 KW - tsunamis KW - shallow-water environment KW - impact features KW - geologic hazards KW - asteroids KW - simulation KW - mitigation KW - velocity KW - hydrodynamics KW - propagation KW - ocean floors KW - water KW - numerical models KW - trajectories KW - atmosphere KW - impacts KW - depth KW - size KW - ocean basins KW - deep-water environment KW - ocean waves KW - near-field KW - volume KW - natural hazards KW - risk assessment KW - impact craters KW - winds KW - energy KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1030490262?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Pure+and+Applied+Geophysics&rft.atitle=Calculations+of+asteroid+impacts+into+deep+and+shallow+water&rft.au=Gisler%2C+Galen%3BWeaver%2C+Robert%3BGittings%2C+Michael%3BSatake%2C+Kenji%3BRabinovich%2C+Alexander+B%3BKanoglu%2C+Utku%3BTinti%2C+Stefano&rft.aulast=Gisler&rft.aufirst=Galen&rft.date=2011-06-01&rft.volume=168&rft.issue=6-7&rft.spage=1187&rft.isbn=&rft.btitle=&rft.title=Pure+and+Applied+Geophysics&rft.issn=00334553&rft_id=info:doi/10.1007%2Fs00024-010-0225-7 L2 - http://link.springer.de/link/service/journals/00024/index.htm LA - English DB - GeoRef N1 - Conference title - 24th international tsunami symposium N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 38 N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2012-08-02 N1 - CODEN - PAGYAV N1 - SubjectsTermNotLitGenreText - asteroids; atmosphere; deep-water environment; depth; energy; geologic hazards; hydrodynamics; impact craters; impact features; impacts; mitigation; natural hazards; near-field; numerical models; ocean basins; ocean floors; ocean waves; propagation; risk assessment; shallow-water environment; simulation; size; trajectories; tsunamis; velocity; volume; water; winds DO - http://dx.doi.org/10.1007/s00024-010-0225-7 ER - TY - JOUR T1 - B-bearing fluids; caught in the act AN - 1017953193; 2012-053806 AB - Fluid flow in the Earth's crust can be tracked, in part, by minerals that require a fluid-mobile element for formation. Tourmaline is nature's boron recorder. In many metamorphic systems, tourmaline growth reflects availability of boron-bearing fluids to the rocks. Such fluids can be internally derived, primarily from the progressive release of B during metamorphic breakdown reactions e.g., clays and micas. Alternatively, B-bearing fluids can be externally derived and infiltrate the metamorphic rocks e.g., from an associated pluton, if there exist sufficient chemical gradients, porosity and permeability. During metamorphism, tourmaline (tur) formation records both types of fluid involvement. For example, internal fluids carrying B are marked by discrete stages of tourmaline growth, typically as overgrowths on a detrital tur core. Progressive growth zones are marked by distinct changes in mineral chemistry and decreases in compositional variability at the +c and -c axes. Externally derived fluids may be recognized by development of tourmaline-rich zones adjacent to igneous intrusions. In contrast, B infiltration may leave a more subtle trace such as the development of tourmaline-rich muscovite pseudomorphs after staurolite. Here tur records the infiltration of B-bearing magmatic fluids during high-grade metamorphism. Irreversible mineral-texture modeling combined with thermodynamic properties of the aqueous ions suggest that infiltration develops near the peak of contact metamorphism after sillimanite begins to form. Computational heat and mass transport modeling of fluid evolution from a crystallizing pluton approximates timing as well as the timescales over which infiltration likely occurs during prograde metamorphism. For a 30km by 3km sheet-like granitoid intruded into host rocks with sufficient permeability to allow fluid flow, peak temperatures occur in about 500ky. By this time, host rocks have largely dehydrated, fluid pressures are insufficient to fracture the rock and provide pathways for flow, and the pluton has largely crystallized and released its fluid. Consequently, tourmaline growth and B movement must occur within this time frame. Tourmaline growth and dissolution provide a powerful signature of B cycling and transfer via fluids in the crust. JF - Mineralogical Magazine AU - Dutrow, B L AU - Henry, D J AU - Gable, C W AU - Travis, B J AU - Foster, C T, Jr AU - Anonymous Y1 - 2011/06// PY - 2011 DA - June 2011 SP - 793 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - silicates KW - sillimanite KW - ring silicates KW - fluid phase KW - crystal growth KW - migration of elements KW - fluid dynamics KW - metamorphism KW - geochemical cycle KW - nesosilicates KW - contact metamorphism KW - water-rock interaction KW - infiltration KW - metamorphic rocks KW - orthosilicates KW - theoretical models KW - boron KW - thermodynamic properties KW - prograde metamorphism KW - geochemistry KW - permeability KW - crust KW - tourmaline group KW - 01B:Mineralogy of silicates KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1017953193?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=B-bearing+fluids%3B+caught+in+the+act&rft.au=Dutrow%2C+B+L%3BHenry%2C+D+J%3BGable%2C+C+W%3BTravis%2C+B+J%3BFoster%2C+C+T%2C+Jr%3BAnonymous&rft.aulast=Dutrow&rft.aufirst=B&rft.date=2011-06-01&rft.volume=75&rft.issue=3&rft.spage=793&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/712.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - boron; contact metamorphism; crust; crystal growth; fluid dynamics; fluid phase; geochemical cycle; geochemistry; infiltration; metamorphic rocks; metamorphism; migration of elements; nesosilicates; orthosilicates; permeability; prograde metamorphism; ring silicates; silicates; sillimanite; theoretical models; thermodynamic properties; tourmaline group; water-rock interaction ER - TY - JOUR T1 - Secondary crustal effects on MORB composition at the Kolbeinsey Ridge AN - 1011393374; 2012-042713 AB - We present results for the systematic crustal alteration of basalts from the shallow, slow-spreading Kolbeinsey Ridge (67 degrees 05'-70 degrees 26'N). Age-constrained Kolbeinsey lavas are isotopically depleted (e.g. (super 87) Sr/ (super 86) Sr = 0.70272-0.70301) with ( (super 230) Th/ (super 238) U) = 0.95-1.30, low U (> or =11ppb), and low Th (> or =33ppb). The basalts have a narrow range of ( (super 230) Th/ (super 232) Th) ratios (1.20-1.32) over a large range in ( (super 238) U/ (super 232) Th) (0.94-1.32), producing a horizontal array on a ( (super 230) Th/ (super 232) Th) vs. ( (super 238) U/ (super 232) Th) diagram. However, we observe that the range of ( (super 230) Th/ (super 238) U) (0.96-1.30) is inversely and nearly linearly correlated with ( (super 234) U/ (super 238) U), reflecting shallow crustal alteration of the basalts. Variations in U and Th concentrations and Cl/K (sub 2) O ratios are not systematic, indicating a combination of crustal alteration mechanisms. For example, samples with elevated Cl/K (sub 2) O ratios but no elevated ( (super 234) U/ (super 238) U) ratios have likely experienced the addition of subsurface brines with low oxidation states and, thus, low U solubilities; the addition of those fluids is not expected to systematically affect the U isotope composition of the basalts. (super 87) Sr/ (super 86) Sr and ( (super 234) U/ (super 238) U) isotope variations, on the other hand, support the systematic addition of material from hydrothermally altered crustal rocks to the basalts. Unaltered Kolbeinsey lavas have high ( (super 230) Th/ (super 238) U) values (> or =1.2), which are consistent with melting in the presence of garnet and with production of thick ocean crust by large degrees of melting. JF - Mineralogical Magazine AU - Elkins, L J AU - Sims, K W W AU - Prytulak, J AU - Mattielli, N AU - Elliott, T AU - Dunbar, N AU - Blichert-Toft, Janne AU - Devey, C AU - Mertz, D AU - Schilling, J G AU - Murrell, M AU - Anonymous Y1 - 2011/06// PY - 2011 DA - June 2011 SP - 805 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - oceanic crust KW - alteration KW - volcanic rocks KW - isotopes KW - igneous rocks KW - Kolbeinsey Ridge KW - Norwegian Sea KW - metasomatism KW - stable isotopes KW - radioactive isotopes KW - melting KW - basalts KW - sea-floor spreading KW - Arctic Ocean KW - hydrothermal alteration KW - geochemistry KW - spreading centers KW - U-238/Th-232 KW - alkaline earth metals KW - Th-232/Th-230 KW - isotope ratios KW - U-238/Th-230 KW - Sr-87/Sr-86 KW - plate tectonics KW - lava KW - metals KW - mid-ocean ridge basalts KW - brines KW - thorium KW - uranium KW - U-238/U-234 KW - actinides KW - strontium KW - crust KW - 18:Solid-earth geophysics KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1011393374?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Secondary+crustal+effects+on+MORB+composition+at+the+Kolbeinsey+Ridge&rft.au=Elkins%2C+L+J%3BSims%2C+K+W+W%3BPrytulak%2C+J%3BMattielli%2C+N%3BElliott%2C+T%3BDunbar%2C+N%3BBlichert-Toft%2C+Janne%3BDevey%2C+C%3BMertz%2C+D%3BSchilling%2C+J+G%3BMurrell%2C+M%3BAnonymous&rft.aulast=Elkins&rft.aufirst=L&rft.date=2011-06-01&rft.volume=75&rft.issue=3&rft.spage=805&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/796.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - actinides; alkaline earth metals; alteration; Arctic Ocean; basalts; brines; crust; geochemistry; hydrothermal alteration; igneous rocks; isotope ratios; isotopes; Kolbeinsey Ridge; lava; melting; metals; metasomatism; mid-ocean ridge basalts; Norwegian Sea; oceanic crust; plate tectonics; radioactive isotopes; sea-floor spreading; spreading centers; Sr-87/Sr-86; stable isotopes; strontium; Th-232/Th-230; thorium; U-238/Th-230; U-238/Th-232; U-238/U-234; uranium; volcanic rocks ER - TY - JOUR T1 - Interpretation of direct methanol fuel cell electrolyte properties using non-traditional length-scale parameters AN - 869584009; 14694512 AB - Numerous sulfonated polymer electrolyte membranes (PEMs) have been developed for direct methanol fuel cells (DMFCs) during the last decade. An analysis for DMFC PEMs obtained from the literature data and structural information is presented based on non-traditional length scale parameters. The analysis presented highlights specific differences in chemical composition between PEMs including perfluorinated sulfonic acids, hydrocarbon-based and polymers having specific interactions. Differences in cross-linked, homopolymer-like, random and multi-block polymer architectures are also discussed. The analysis presented gives important insight into molecular design aspects of sulfonated PEMs for DMFCs. JF - Journal of Membrane Science AU - Kim, Yu Seung AU - Kim, Dae Sik AU - Guiver, Michael D AU - Pivovar, Bryan S AD - Sensors & Electrochemical Devices Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, yskim@lanl.gov Y1 - 2011/05/15/ PY - 2011 DA - 2011 May 15 SP - 49 EP - 58 PB - Elsevier Science, P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 374 IS - 1-2 SN - 0376-7388, 0376-7388 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality KW - Fuel technology KW - Fuels KW - Methanol KW - Architecture KW - Chemical Composition KW - Fuel KW - Electrolytes KW - Membranes KW - Chemical composition KW - Hydrocarbons KW - electrolytes KW - Acids KW - Polymers KW - SW 5010:Network design KW - AQ 00007:Industrial Effluents KW - Q5 08504:Effects on organisms UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/869584009?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Membrane+Science&rft.atitle=Interpretation+of+direct+methanol+fuel+cell+electrolyte+properties+using+non-traditional+length-scale+parameters&rft.au=Kim%2C+Yu+Seung%3BKim%2C+Dae+Sik%3BGuiver%2C+Michael+D%3BPivovar%2C+Bryan+S&rft.aulast=Kim&rft.aufirst=Yu&rft.date=2011-05-15&rft.volume=374&rft.issue=1-2&rft.spage=49&rft.isbn=&rft.btitle=&rft.title=Journal+of+Membrane+Science&rft.issn=03767388&rft_id=info:doi/10.1016%2Fj.memsci.2011.03.004 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-05-01 N1 - Last updated - 2014-05-02 N1 - SubjectsTermNotLitGenreText - Electrolytes; Chemical composition; Fuels; Fuel technology; Membranes; Hydrocarbons; electrolytes; Polymers; Acids; Methanol; Architecture; Chemical Composition; Fuel DO - http://dx.doi.org/10.1016/j.memsci.2011.03.004 ER - TY - CPAPER T1 - Vaccine design concepts for HIV, a highly variable pathogen T2 - 98th Annual Meeting of the American Association of Immunologists (AAI 2011) AN - 1313046543; 6077580 JF - 98th Annual Meeting of the American Association of Immunologists (AAI 2011) AU - Korber, Bette Y1 - 2011/05/13/ PY - 2011 DA - 2011 May 13 KW - Human immunodeficiency virus KW - vaccines KW - Pathogens KW - Vaccines KW - Disease control UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313046543?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=98th+Annual+Meeting+of+the+American+Association+of+Immunologists+%28AAI+2011%29&rft.atitle=Vaccine+design+concepts+for+HIV%2C+a+highly+variable+pathogen&rft.au=Korber%2C+Bette&rft.aulast=Korber&rft.aufirst=Bette&rft.date=2011-05-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=98th+Annual+Meeting+of+the+American+Association+of+Immunologists+%28AAI+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://www.immunology2011.org/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Probing interband coulomb interactions in semiconductor nanostructures with 2D double-quantum coherence spectroscopy. AN - 865187598; 21391697 AB - Employing the interband exciton scattering model, we have derived a closed set of equations determining the 2D double-quantum coherence signal sensitive to the interband Coulomb interactions (i.e., many-body Coulomb interactions leading to the couplings between exciton and biexciton bands) in semiconductor nanostructures such as nanocrystals, quantum wires, wells, and carbon nanotubes. Our general analysis of 2D double-quantum coherence resonances has demonstrated that the interband Coulomb interactions lead to new cross-peaks whose appearance can be interpreted as a result of exciton and biexciton state mixing. The presence of the strongly coupled resonant states and weakly coupled background of off-resonant states can significantly simplify cross-peak analysis by eliminating the congested background spectrum. Our simulations of the 2D double-quantum coherence signal in PbSe NCs have validated this approach. JF - The journal of physical chemistry. B AU - Velizhanin, Kirill A AU - Piryatinski, Andrei AD - Center for Nonlinear Studies, Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States. Y1 - 2011/05/12/ PY - 2011 DA - 2011 May 12 SP - 5372 EP - 5382 VL - 115 IS - 18 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/865187598?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+journal+of+physical+chemistry.+B&rft.atitle=Probing+interband+coulomb+interactions+in+semiconductor+nanostructures+with+2D+double-quantum+coherence+spectroscopy.&rft.au=Velizhanin%2C+Kirill+A%3BPiryatinski%2C+Andrei&rft.aulast=Velizhanin&rft.aufirst=Kirill&rft.date=2011-05-12&rft.volume=115&rft.issue=18&rft.spage=5372&rft.isbn=&rft.btitle=&rft.title=The+journal+of+physical+chemistry.+B&rft.issn=1520-5207&rft_id=info:doi/10.1021%2Fjp109453y LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2011-08-25 N1 - Date created - 2011-05-05 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/jp109453y ER - TY - JOUR T1 - Mathematical model of a three-stage innate immune response to a pneumococcal lung infection AN - 888102216; 14604617 AB - Pneumococcal pneumonia is a leading cause of death and a major source of human morbidity. The initial immune response plays a central role in determining the course and outcome of pneumococcal disease. We combine bacterial titer measurements from mice infected with Streptococcus pneumoniae with mathematical modeling to investigate the coordination of immune responses and the effects of initial inoculum on outcome. To evaluate the contributions of individual components, we systematically build a mathematical model from three subsystems that describe the succession of defensive cells in the lung: resident alveolar macrophages, neutrophils and monocyte-derived macrophages. The alveolar macrophage response, which can be modeled by a single differential equation, can by itself rapidly clear small initial numbers of pneumococci. Extending the model to include the neutrophil response required additional equations for recruitment cytokines and host cell status and damage. With these dynamics, two outcomes can be predicted: bacterial clearance or sustained bacterial growth. Finally, a model including monocyte-derived macrophage recruitment by neutrophils suggests that sustained bacterial growth is possible even in their presence. Our model quantifies the contributions of cytotoxicity and immune-mediated damage in pneumococcal pathogenesis. JF - Journal of Theoretical Biology AU - Smith, Amber M AU - McCullers, Jonathan A AU - Adler, Frederick R AD - Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Y1 - 2011/05/07/ PY - 2011 DA - 2011 May 07 SP - 106 EP - 116 PB - Elsevier Science, P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 276 IS - 1 SN - 0022-5193, 0022-5193 KW - Ecology Abstracts; Microbiology Abstracts B: Bacteriology KW - Macrophages KW - Mathematical models KW - Leukocytes (neutrophilic) KW - Animal models KW - Succession KW - Infection KW - Morbidity KW - Alveoli KW - Streptococcus pneumoniae KW - Cytotoxicity KW - Lung KW - Inoculum KW - Cytokines KW - Monocytes KW - Immune response KW - Pneumonia KW - J 02310:Genetics & Taxonomy KW - D 04030:Models, Methods, Remote Sensing UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/888102216?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologyb&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Theoretical+Biology&rft.atitle=Mathematical+model+of+a+three-stage+innate+immune+response+to+a+pneumococcal+lung+infection&rft.au=Smith%2C+Amber+M%3BMcCullers%2C+Jonathan+A%3BAdler%2C+Frederick+R&rft.aulast=Smith&rft.aufirst=Amber&rft.date=2011-05-07&rft.volume=276&rft.issue=1&rft.spage=106&rft.isbn=&rft.btitle=&rft.title=Journal+of+Theoretical+Biology&rft.issn=00225193&rft_id=info:doi/10.1016%2Fj.jtbi.2011.01.052 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-09-01 N1 - Last updated - 2013-12-04 N1 - SubjectsTermNotLitGenreText - Macrophages; Mathematical models; Animal models; Leukocytes (neutrophilic); Infection; Succession; Alveoli; Morbidity; Cytotoxicity; Lung; Inoculum; Cytokines; Immune response; Monocytes; Pneumonia; Streptococcus pneumoniae DO - http://dx.doi.org/10.1016/j.jtbi.2011.01.052 ER - TY - JOUR T1 - Appearance of layered structures in numerical simulations of polydisperse bodies accretion; application to cometary nuclei AN - 894807680; 2011-080350 JF - Icarus AU - Lasue, J AU - Botet, R AU - Levasseur-Regourd, A C AU - Hadamcik, E AU - Kofman, W Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 369 EP - 381 PB - Elsevier, New York, NY VL - 213 IS - 1 SN - 0019-1035, 0019-1035 KW - sintering KW - aggregate KW - bulk density KW - accretion KW - power law KW - numerical models KW - density KW - cometary nuclei KW - porous materials KW - tensile strength KW - simulation KW - porosity KW - layered materials KW - models KW - compaction KW - size distribution KW - comets KW - fractals KW - catastrophes KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/894807680?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Appearance+of+layered+structures+in+numerical+simulations+of+polydisperse+bodies+accretion%3B+application+to+cometary+nuclei&rft.au=Lasue%2C+J%3BBotet%2C+R%3BLevasseur-Regourd%2C+A+C%3BHadamcik%2C+E%3BKofman%2C+W&rft.aulast=Lasue&rft.aufirst=J&rft.date=2011-05-01&rft.volume=213&rft.issue=1&rft.spage=369&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2011.02.026 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2011-01-01 N1 - Number of references - 66 N1 - PubXState - NY N1 - Document feature - illus. N1 - Last updated - 2012-06-07 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - accretion; aggregate; bulk density; catastrophes; cometary nuclei; comets; compaction; density; fractals; layered materials; models; numerical models; porosity; porous materials; power law; simulation; sintering; size distribution; tensile strength DO - http://dx.doi.org/10.1016/j.icarus.2011.02.026 ER - TY - JOUR T1 - Improved best estimate plus uncertainty methodology, including advanced validation concepts, to license evolving nuclear reactors AN - 889424736; 14977223 AB - Many evolving nuclear energy technologies use advanced predictive multiscale, multiphysics modeling and simulation (M&S) capabilities to reduce the cost and schedule of design and licensing. Historically, the role of experiments has been as a primary tool for the design and understanding of nuclear system behavior, while M&S played the subordinate role of supporting experiments. In the new era of multiscale, multiphysics computational-based technology development, this role has been reversed. The experiments will still be needed, but they will be performed at different scales to calibrate and validate the models leading to predictive simulations for design and licensing. Minimizing the required number of validation experiments produces cost and time savings. The use of multiscale, multiphysics models introduces challenges in validating these predictive tools - traditional methodologies will have to be modified to address these challenges. This paper gives the basic aspects of a methodology that can potentially be used to address these new challenges in the design and licensing of evolving nuclear technology. The main components of the proposed methodology are verification, validation, calibration, and uncertainty quantification - steps similar to the components of the traditional US Nuclear Regulatory Commission (NRC) licensing approach, with the exception of the calibration step. An enhanced calibration concept is introduced here, and is accomplished through data assimilation. The goal of this methodology is to enable best-estimate prediction of system behaviors in both normal and safety-related environments. This goal requires the additional steps of estimating the domain of validation, and quantification of uncertainties, allowing for the extension of results to areas of the validation domain that are not directly tested with experiments. These might include the extension of the M&S capabilities for application to full-scale systems. The new methodology suggests a formalism to quantify an adequate level of validation (predictive maturity) with respect to existing data, so that required new testing can be minimized, saving cost by demonstrating that further testing will not enhance the quality of the predictive tools. The proposed methodology is at a conceptual level. Upon maturity, and if considered favorably by the stakeholders, it could serve as a new framework for the next generation of the best estimate plus uncertainty (BEPU) licensing methodology that the NRC has developed. In order to achieve maturity, the methodology must be communicated to scientific, design, and regulatory stakeholders for discussion and debate. This paper is the first step in establishing that communication. JF - Nuclear Engineering and Design AU - Unal, C AU - Williams, B AU - Hemez, F AU - Atamturktur, SH AU - McClure, P AD - Los Alamos National Laboratory, Bikini Atoll Rd., SM 30, Los Alamos, NM 87545, United States cu@lanl.gov Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 1813 EP - 1833 PB - Elsevier Science, The Boulevard Kidlington Oxford OX5 1GB UK VL - 241 IS - 5 SN - 0029-5493, 0029-5493 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); Electronics and Communications Abstracts (EA); CSA / ASCE Civil Engineering Abstracts (CE) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/889424736?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nuclear+Engineering+and+Design&rft.atitle=Improved+best+estimate+plus+uncertainty+methodology%2C+including+advanced+validation+concepts%2C+to+license+evolving+nuclear+reactors&rft.au=Unal%2C+C%3BWilliams%2C+B%3BHemez%2C+F%3BAtamturktur%2C+SH%3BMcClure%2C+P&rft.aulast=Unal&rft.aufirst=C&rft.date=2011-05-01&rft.volume=241&rft.issue=5&rft.spage=1813&rft.isbn=&rft.btitle=&rft.title=Nuclear+Engineering+and+Design&rft.issn=00295493&rft_id=info:doi/10.1016%2Fj.nucengdes.2011.01.048 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-09-01 N1 - Last updated - 2011-11-11 DO - http://dx.doi.org/10.1016/j.nucengdes.2011.01.048 ER - TY - JOUR T1 - Two-Dimensional Fast-Response Flood Modeling: Desktop Parallel Computing and Domain Tracking AN - 880665388; 14871877 AB - Emergency flood management is enhanced by using models that can estimate the timing and location of flooding. Typically, flood routing and inundation prediction is accomplished by using one-dimensional (1D) models. These have been the models of choice because they are computationally simple and quick. However, these models do not adequately represent the complex physical processes present for shallow flows located in the floodplain or in urban areas. Two-dimensional (2D) models developed on the basis of the full hydrodynamic equations can be used to represent the complex flow phenomena that exist in the floodplain and are, therefore, recommended by the National Research Council for increased use in flood analysis studies. The major limitation of these models is the increased computational cost. Two-dimensional flood models are prime candidates for parallel computing, but traditional methods/equipment (e.g., message passing paradigm) are more complex in terms of code refactoring and hardware setup. In addition, these hardware systems may not be available or accessible to modelers conducting flood analyses. This paper presents a 2D flood model that implements multithreading for use on now-prevalent multicore computers. This desktop parallel computing architecture has been shown to decrease computation time by 14 times on a 16-processor computer and, when coupled with a wet cell tracking algorithm, has been shown to decrease computation by as much as 310 times. These accomplishments make high-fidelity flood modeling more feasible for flood inundation studies using readily available desktop computers. JF - Journal of Computing in Civil Engineering AU - Judi, David R AU - Burian, Steven J AU - McPherson, Timothy N AD - Research and Development Engineer, Los Alamos National Laboratory, MS K488, Los Alamos, NM 87545, djudi@lanl.gov Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 184 EP - 191 PB - American Society of Civil Engineers, 345 E. 47th St. New York NY 10017-2398 USA VL - 25 IS - 3 SN - 0887-3801, 0887-3801 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Computation KW - Floods KW - Shallow water KW - Two-dimensional models KW - Flow KW - Mathematical models KW - Hydrodynamics KW - Algorithms KW - Hydrodynamic equations KW - Shallow Water KW - Tracking KW - Methodology KW - Flood Plains KW - Civil Engineering KW - Flood plains KW - Urban Areas KW - Flooding KW - Emergencies KW - Modelling KW - Q2 09282:Materials technology, corrosion, fouling and boring KW - SW 0810:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/880665388?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Computing+in+Civil+Engineering&rft.atitle=Two-Dimensional+Fast-Response+Flood+Modeling%3A+Desktop+Parallel+Computing+and+Domain+Tracking&rft.au=Judi%2C+David+R%3BBurian%2C+Steven+J%3BMcPherson%2C+Timothy+N&rft.aulast=Judi&rft.aufirst=David&rft.date=2011-05-01&rft.volume=25&rft.issue=3&rft.spage=184&rft.isbn=&rft.btitle=&rft.title=Journal+of+Computing+in+Civil+Engineering&rft.issn=08873801&rft_id=info:doi/10.1061%2F%28ASCE%29CP.1943-5487.0000064 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-11-01 N1 - Last updated - 2017-02-15 N1 - SubjectsTermNotLitGenreText - Mathematical models; Flood plains; Floods; Flooding; Emergencies; Hydrodynamic equations; Tracking; Methodology; Modelling; Flow; Flood Plains; Civil Engineering; Hydrodynamics; Urban Areas; Algorithms; Shallow Water DO - http://dx.doi.org/10.1061/(ASCE)CP.1943-5487.0000064 ER - TY - JOUR T1 - Structure-function relations are subtle in genetic regulatory networks AN - 879476278; 14767999 AB - Recent studies have yielded insights into structure-function relations in genetic regulatory networks. Models of feed-forward loops show that the input-output behavior depends critically on the input signal as well as transcription interactions. Models of induction of the lac operon in Escherichia coli reveal the importance of metabolism in determining genetic regulatory network behavior. Combined experimental and computational studies of activation by MarA in E. coli show how mechanisms of transcription regulation, hidden at the level of genetic regulatory networks, can influence behavior. Together these studies illustrate that gene regulation is critically influenced by factors beyond the topology of genetic regulatory interactions. Prediction of the specific information processing roles of gene circuits is more difficult than we would like, but it is still possible. Thinking about evolution of proteins and networks might make it easier. JF - Mathematical Biosciences AU - Wall, Michael E AD - Computer, Computational, and Statistical Sciences Division, Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM 87505, USA, mewall@lanl.gov Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 61 EP - 68 PB - Elsevier Science, Box 882 New York NY 10159 USA VL - 231 IS - 1 SN - 0025-5564, 0025-5564 KW - Genetics Abstracts; Biotechnology and Bioengineering Abstracts KW - Circuits KW - Escherichia coli KW - Transcription KW - W 30910:Imaging KW - G 07770:Bacteria UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/879476278?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mathematical+Biosciences&rft.atitle=Structure-function+relations+are+subtle+in+genetic+regulatory+networks&rft.au=Wall%2C+Michael+E&rft.aulast=Wall&rft.aufirst=Michael&rft.date=2011-05-01&rft.volume=231&rft.issue=1&rft.spage=61&rft.isbn=&rft.btitle=&rft.title=Mathematical+Biosciences&rft.issn=00255564&rft_id=info:doi/10.1016%2Fj.mbs.2011.02.003 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-07-01 N1 - Last updated - 2014-03-24 N1 - SubjectsTermNotLitGenreText - Transcription; Escherichia coli DO - http://dx.doi.org/10.1016/j.mbs.2011.02.003 ER - TY - JOUR T1 - Measurements and full-field predictions of deformation heterogeneities in ice AN - 877848908; 2011-061220 AB - We have made creep experiments on columnar grained ice and characterised the microstructure and intragranular misorientations over a range of length scales. A FFT full-field model was used to predict the deformation behaviour, using the experimentally characterised microstructure as the starting material. This is the first time this combination of techniques has been used to study the deformation of ice. The microstructure was characterised at the cm scale using an optical technique, the automatic ice texture analyser AITA and at the micron scale using electron backscattered diffraction EBSD. The crystallographic texture and intragranular misorientations were fully characterised by EBSD (3 angles). The deformed microstructure frequently showed straight subgrain boundaries often originating at triple points. These were identified as kink bands, and for the first time we have measured the precise misorientation of the kink bands and deduced the nature of the dislocations responsible for them. These dislocations have a basal edge nature and align in contiguous prismatic planes enabling deformation along the c-axis. In addition, non-uniform grain boundaries and regions of recrystallization were seen. We present coupling between fine scale characterization of intragranular misorientations, from experiments, and prediction of internal stresses that cause it. The model predicts the morphology of the observed local misorientations within the grains, however it over predicts the misorientation values. This is because the annealing and recrystallization mechanisms are not taken into account in the model. Ice is excellent as a model material for measuring, predicting and understanding deformation behaviour for polycrystalline materials. Specifically for ice this knowledge is needed to improve models of ice sheet dynamics that are important for climatic signal interpretation. Abstract Copyright (2011) Elsevier, B.V. JF - Earth and Planetary Science Letters AU - Montagnat, Maurine AU - Blackford, Jane R AU - Piazolo, Sandra AU - Arnaud, Laurent AU - Lebensohn, Ricardo A Y1 - 2011/05/01/ PY - 2011 DA - 2011 May 01 SP - 153 EP - 160 PB - Elsevier, Amsterdam VL - 305 IS - 1-2 SN - 0012-821X, 0012-821X KW - experimental studies KW - lattice KW - strain KW - electron backscatter diffraction KW - electron diffraction data KW - stress KW - microstructure KW - deformation KW - recrystallization KW - ice sheets KW - measurement KW - grain boundaries KW - ice KW - creep KW - polycrystalline materials KW - glacial geology KW - heterogeneity KW - compression KW - climate KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/877848908?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+School+Leadership&rft.atitle=Character+in+Action%3A+A+Case+of+Authentic+Educational+Leadership+That+Advanced+Equity+and+Excellence&rft.au=Beard%2C+Karen+Stansberry&rft.aulast=Beard&rft.aufirst=Karen&rft.date=2013-11-01&rft.volume=23&rft.issue=6&rft.spage=1015&rft.isbn=&rft.btitle=&rft.title=Journal+of+School+Leadership&rft.issn=10526846&rft_id=info:doi/ L2 - http://www.sciencedirect.com/science/journal/0012821X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2011-01-01 N1 - Number of references - 74 N1 - Document feature - illus. N1 - Last updated - 2014-03-14 N1 - CODEN - EPSLA2 N1 - SubjectsTermNotLitGenreText - climate; compression; creep; deformation; electron backscatter diffraction; electron diffraction data; experimental studies; glacial geology; grain boundaries; heterogeneity; ice; ice sheets; lattice; measurement; microstructure; polycrystalline materials; recrystallization; strain; stress DO - http://dx.doi.org/10.1016/j.epsl.2011.02.050 ER - TY - JOUR T1 - Time-reversal applied to seismic data of the Japan earthquake of March 11, 2011 AN - 877840559; 2011-061318 JF - Seismological Research Letters AU - Larmat, C AU - Montagner, J P AU - Johnson, P A AU - Anonymous Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 459 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 3 SN - 0895-0695, 0895-0695 KW - Tohoku-Oki earthquake 2011 KW - Far East KW - seismicity KW - stress KW - magnitude KW - propagation KW - Asia KW - earthquakes KW - Japan KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/877840559?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Time-reversal+applied+to+seismic+data+of+the+Japan+earthquake+of+March+11%2C+2011&rft.au=Larmat%2C+C%3BMontagner%2C+J+P%3BJohnson%2C+P+A%3BAnonymous&rft.aulast=Larmat&rft.aufirst=C&rft.date=2011-05-01&rft.volume=82&rft.issue=3&rft.spage=459&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - 2011 annual meeting of the Seismological Society of America N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2011-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - Asia; earthquakes; Far East; Japan; magnitude; propagation; seismicity; stress; Tohoku-Oki earthquake 2011 ER - TY - JOUR T1 - Identification of Pumping Influences in LongaTerm Water Level Fluctuations AN - 869572134; 14706068 AB - Identification of the pumping influences at monitoring wells caused by spatially and temporally variable water supply pumping can be a challenging, yet an important hydrogeological task. The information that can be obtained can be critical for conceptualization of the hydrogeological conditions and indications of the zone of influence of the individual pumping wells. However, the pumping influences are often intermittent and small in magnitude with variable production rates from multiple pumping wells. While these difficulties may support an inclination to abandon the existing dataset and conduct a dedicated cross-hole pumping test, that option can be challenging and expensive to coordinate and execute. This paper presents a method that utilizes a simple analytical modeling approach for analysis of a long-term water level record utilizing an inverse modeling approach. The methodology allows the identification of pumping wells influencing the water level fluctuations. Thus, the analysis provides an efficient and cost-effective alternative to designed and coordinated cross-hole pumping tests. We apply this method on a dataset from the Los Alamos National Laboratory site. Our analysis also provides (1) an evaluation of the information content of the transient water level data; (2) indications of potential structures of the aquifer heterogeneity inhibiting or promoting pressure propagation; and (3) guidance for the development of more complicated models requiring detailed specification of the aquifer heterogeneity. JF - Ground Water AU - Harp, Dylan R AU - Vesselinov, Velimir V AD - Computational Earth Science Group, Earth and Environmental Sciences Division, Los Alamos National Laboratory, MS T003, Los Alamos, NM 87544. Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 403 EP - 414 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 USA VL - 49 IS - 3 SN - 0017-467X, 0017-467X KW - Environment Abstracts; Water Resources Abstracts; Aqualine Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality KW - Aquifers KW - Aquifer KW - USA, New Mexico, Los Alamos KW - Water levels KW - Water Level Fluctuations KW - Pumping Tests KW - Pumping KW - Heterogeneity KW - Water Level KW - Model Studies KW - Water supply KW - water levels KW - Geohydrology KW - Groundwater KW - AQ 00007:Industrial Effluents KW - Q5 08502:Methods and instruments KW - SW 4020:Evaluation process KW - ENA 07:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/869572134?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Ground+Water&rft.atitle=Identification+of+Pumping+Influences+in+LongaTerm+Water+Level+Fluctuations&rft.au=Harp%2C+Dylan+R%3BVesselinov%2C+Velimir+V&rft.aulast=Harp&rft.aufirst=Dylan&rft.date=2011-05-01&rft.volume=49&rft.issue=3&rft.spage=403&rft.isbn=&rft.btitle=&rft.title=Ground+Water&rft.issn=0017467X&rft_id=info:doi/10.1111%2Fj.1745-6584.2010.00725.x LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-05-01 N1 - Document feature - figure 6 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Water levels; Aquifer; Pumping; Water supply; water levels; Groundwater; Aquifers; Pumping Tests; Water Level Fluctuations; Geohydrology; Water Level; Heterogeneity; Model Studies; USA, New Mexico, Los Alamos DO - http://dx.doi.org/10.1111/j.1745-6584.2010.00725.x ER - TY - JOUR T1 - Neogene and ongoing dynamic uplift of the Rocky Mountains due to mantle convection, and its surface manifestations AN - 1015458914; 2012-046806 JF - New Mexico Geology AU - Karlstrom, K E AU - Darling, A AU - Crossey, L J AU - Crow, R AU - Coblentz, D AU - Ouimet, W AU - Kirby, E AU - Van Wijk, J AU - Kelley, A AU - Heizler, M T AU - Aster, R AU - MacCarthy, J AU - Lazear, G AU - Dueker, K AU - Hansen, J AU - Stachnik, J AU - Anonymous Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 44 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM VL - 33 IS - 2 SN - 0196-948X, 0196-948X KW - United States KW - North America KW - lithosphere KW - uplifts KW - mantle KW - U. S. Rocky Mountains KW - continental crust KW - convection KW - paleogeography KW - Cenozoic KW - continental lithosphere KW - Tertiary KW - neotectonics KW - Neogene KW - tectonics KW - Rocky Mountains KW - crust KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1015458914?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=New+Mexico+Geology&rft.atitle=Neogene+and+ongoing+dynamic+uplift+of+the+Rocky+Mountains+due+to+mantle+convection%2C+and+its+surface+manifestations&rft.au=Karlstrom%2C+K+E%3BDarling%2C+A%3BCrossey%2C+L+J%3BCrow%2C+R%3BCoblentz%2C+D%3BOuimet%2C+W%3BKirby%2C+E%3BVan+Wijk%2C+J%3BKelley%2C+A%3BHeizler%2C+M+T%3BAster%2C+R%3BMacCarthy%2C+J%3BLazear%2C+G%3BDueker%2C+K%3BHansen%2C+J%3BStachnik%2C+J%3BAnonymous&rft.aulast=Karlstrom&rft.aufirst=K&rft.date=2011-05-01&rft.volume=33&rft.issue=2&rft.spage=44&rft.isbn=&rft.btitle=&rft.title=New+Mexico+Geology&rft.issn=0196948X&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - New Mexico Geological Society spring meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - NM N1 - Last updated - 2012-06-07 N1 - CODEN - NMGED2 N1 - SubjectsTermNotLitGenreText - Cenozoic; continental crust; continental lithosphere; convection; crust; lithosphere; mantle; Neogene; neotectonics; North America; paleogeography; Rocky Mountains; tectonics; Tertiary; U. S. Rocky Mountains; United States; uplifts ER - TY - JOUR T1 - The topography of the Western U.S. and its relationship to upper mantle processes AN - 1015458896; 2012-046805 JF - New Mexico Geology AU - Coblentz, D AU - Karlstrom, K E AU - Anonymous Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 44 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM VL - 33 IS - 2 SN - 0196-948X, 0196-948X KW - United States KW - upper mantle KW - North America KW - lithosphere KW - mantle KW - continental crust KW - buoyancy KW - continental lithosphere KW - topography KW - Western U.S. KW - tectonics KW - geomorphology KW - North American Cordillera KW - crust KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1015458896?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=New+Mexico+Geology&rft.atitle=The+topography+of+the+Western+U.S.+and+its+relationship+to+upper+mantle+processes&rft.au=Coblentz%2C+D%3BKarlstrom%2C+K+E%3BAnonymous&rft.aulast=Coblentz&rft.aufirst=D&rft.date=2011-05-01&rft.volume=33&rft.issue=2&rft.spage=44&rft.isbn=&rft.btitle=&rft.title=New+Mexico+Geology&rft.issn=0196948X&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - New Mexico Geological Society spring meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - NM N1 - Last updated - 2012-06-07 N1 - CODEN - NMGED2 N1 - SubjectsTermNotLitGenreText - buoyancy; continental crust; continental lithosphere; crust; geomorphology; lithosphere; mantle; North America; North American Cordillera; tectonics; topography; United States; upper mantle; Western U.S. ER - TY - JOUR T1 - Strength characterization of the Bandelier Tuff AN - 1015458805; 2012-046837 JF - New Mexico Geology AU - Byers, D S AU - Sussman, A J AU - Schultz-Fellenz, E AU - Anonymous Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 52 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM VL - 33 IS - 2 SN - 0196-948X, 0196-948X KW - United States KW - hydrology KW - volcanic rocks KW - Quaternary KW - geologic hazards KW - igneous rocks KW - water management KW - pollution KW - New Mexico KW - Los Alamos County New Mexico KW - ground water KW - aquifers KW - environmental management KW - Cenozoic KW - pyroclastics KW - physical properties KW - Bandelier Tuff KW - natural hazards KW - Pleistocene KW - hydrodynamics KW - tuff KW - earthquakes KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1015458805?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=New+Mexico+Geology&rft.atitle=Strength+characterization+of+the+Bandelier+Tuff&rft.au=Byers%2C+D+S%3BSussman%2C+A+J%3BSchultz-Fellenz%2C+E%3BAnonymous&rft.aulast=Byers&rft.aufirst=D&rft.date=2011-05-01&rft.volume=33&rft.issue=2&rft.spage=52&rft.isbn=&rft.btitle=&rft.title=New+Mexico+Geology&rft.issn=0196948X&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - New Mexico Geological Society spring meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - NM N1 - Last updated - 2012-06-07 N1 - CODEN - NMGED2 N1 - SubjectsTermNotLitGenreText - aquifers; Bandelier Tuff; Cenozoic; earthquakes; environmental management; geologic hazards; ground water; hydrodynamics; hydrology; igneous rocks; Los Alamos County New Mexico; natural hazards; New Mexico; physical properties; Pleistocene; pollution; pyroclastics; Quaternary; tuff; United States; volcanic rocks; water management ER - TY - JOUR T1 - Distinguishing between geologic and anthropogenic salt loads in the Rio Grande using sulfur isotope geochemistry AN - 1015458599; 2012-046821 JF - New Mexico Geology AU - Szynkiewicz, A AU - Borrok, D M AU - Rearick, M S AU - Drury, D O AU - Pratt, L M AU - Anonymous Y1 - 2011/05// PY - 2011 DA - May 2011 SP - 48 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM VL - 33 IS - 2 SN - 0196-948X, 0196-948X KW - United States KW - Rio Grande KW - water quality KW - fertilizers KW - isotopes KW - isotope ratios KW - agriculture KW - water management KW - Texas KW - New Mexico KW - hydrochemistry KW - stable isotopes KW - aquifers KW - S-34/S-32 KW - sulfur KW - shallow aquifers KW - Rio Grande Valley KW - chemical composition KW - water resources KW - geochemistry KW - 02B:Hydrochemistry KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1015458599?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=New+Mexico+Geology&rft.atitle=Distinguishing+between+geologic+and+anthropogenic+salt+loads+in+the+Rio+Grande+using+sulfur+isotope+geochemistry&rft.au=Szynkiewicz%2C+A%3BBorrok%2C+D+M%3BRearick%2C+M+S%3BDrury%2C+D+O%3BPratt%2C+L+M%3BAnonymous&rft.aulast=Szynkiewicz&rft.aufirst=A&rft.date=2011-05-01&rft.volume=33&rft.issue=2&rft.spage=48&rft.isbn=&rft.btitle=&rft.title=New+Mexico+Geology&rft.issn=0196948X&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - New Mexico Geological Society spring meeting N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - NM N1 - Last updated - 2012-06-07 N1 - CODEN - NMGED2 N1 - SubjectsTermNotLitGenreText - agriculture; aquifers; chemical composition; fertilizers; geochemistry; hydrochemistry; isotope ratios; isotopes; New Mexico; Rio Grande; Rio Grande Valley; S-34/S-32; shallow aquifers; stable isotopes; sulfur; Texas; United States; water management; water quality; water resources ER - TY - JOUR T1 - Mechanism of the order-disorder phase transition, and glassy behavior in the metal-organic framework [(CH (sub 3) ) (sub 2) NH (sub 2) ]Zn(HCOO) (sub 3) AN - 1320155498; 2013-030024 AB - Transitions associated with orientational order.disorder phenomena are found in a wide range of materials and may have a significant impact on their properties. In this work, specific heat and (super 1) H NMR measurements have been used to study the phase transition in the metal-organic framework (MOF) compound [(CH (sub 3) ) (sub 2) NH (sub 2) ]Zn(HCOO) (sub 3) . This compound, which possesses a perovskite-type architecture, undergoes a remarkable order.disorder phase transition at 156 K. The (CH (sub 3) (sub 2) NH (sub 2) (super +) (DMA (super +) ) cationic moieties that are bound by hydrogen bonds to the oxygens of the formate groups (N-H...O approximately 2.9 Aa) are essentially trapped inside the basic perovskite cage architecture. Above 156 K, it is the orientations of these moieties that are responsible for the disorder, as each can take up three different orientations with equal probability. Below 156 K, the DMA (super +) is ordered within one of these sites, although the moiety still retains a considerable state of motion. Below 40 K, the rotational motions of the methyl groups start to freeze. As the temperature is increased from 4 K in the NMR measurements, different relaxation pathways can be observed in the temperature range approximately 65.150 K, as a result of a "memory effect." This dynamic behavior is characteristic of a glass in which multiple states possess similar energies, found here for a MOF. This conclusion is strongly supported by the specific heat data. JF - Proceedings of the National Academy of Sciences of the United States of America AU - Besara, Tiglet AU - Jain, Prashant AU - Dalal, Naresh S AU - Kuhns, Philip L AU - Reyes, Arneil P AU - Kroto, Harold W AU - Cheetham, Anthony K Y1 - 2011/04/26/ PY - 2011 DA - 2011 Apr 26 SP - 6828 EP - 6832 PB - National Academy of Sciences, Washington, DC VL - 108 IS - 17 SN - 0027-8424, 0027-8424 KW - specific heat KW - phase transitions KW - crystal structure KW - spectra KW - perovskite structure KW - organo-metallics KW - glass materials KW - NMR spectra KW - temperature KW - order-disorder KW - 17B:Geophysics of minerals and rocks UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1320155498?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.atitle=Mechanism+of+the+order-disorder+phase+transition%2C+and+glassy+behavior+in+the+metal-organic+framework+%5B%28CH+%28sub+3%29+%29+%28sub+2%29+NH+%28sub+2%29+%5DZn%28HCOO%29+%28sub+3%29&rft.au=Besara%2C+Tiglet%3BJain%2C+Prashant%3BDalal%2C+Naresh+S%3BKuhns%2C+Philip+L%3BReyes%2C+Arneil+P%3BKroto%2C+Harold+W%3BCheetham%2C+Anthony+K&rft.aulast=Besara&rft.aufirst=Tiglet&rft.date=2011-04-26&rft.volume=108&rft.issue=17&rft.spage=6828&rft.isbn=&rft.btitle=&rft.title=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.issn=00278424&rft_id=info:doi/10.1073%2Fpnas.1102079108 L2 - http://www.pnas.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 19 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2013-03-28 N1 - CODEN - PNASA6 N1 - SubjectsTermNotLitGenreText - crystal structure; glass materials; NMR spectra; order-disorder; organo-metallics; perovskite structure; phase transitions; specific heat; spectra; temperature DO - http://dx.doi.org/10.1073/pnas.1102079108 ER - TY - JOUR T1 - High-Performance Electrocatalysts for Oxygen Reduction Derived from Polyaniline, Iron, and Cobalt AN - 904469752; 14700309 AB - The prohibitive cost of platinum for catalyzing the cathodic oxygen reduction reaction (ORR) has hampered the widespread use of polymer electrolyte fuel cells. We describe a family of non-precious metal catalysts that approach the performance of platinum-based systems at a cost sustainable for high-power fuel cell applications, possibly including automotive power. The approach uses polyaniline as a precursor to a carbon-nitrogen template for high-temperature synthesis of catalysts incorporating iron and cobalt. The most active materials in the group catalyze the ORR at potentials within approximately 60 millivolts of that delivered by state-of-the-art carbon-supported platinum, combining their high activity with remarkable performance stability for non-precious metal catalysts (700 hours at a fuel cell voltage of 0.4 volts) as well as excellent four-electron selectivity (hydrogen peroxide yield <1.0%). JF - Science (Washington) AU - Wu, Gang AU - More, Karren L AU - Johnston, Christina M AU - Zelenay, Piotr AD - Materials Physics and Applications Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Y1 - 2011/04/22/ PY - 2011 DA - 2011 Apr 22 SP - 443 EP - 447 PB - American Association for the Advancement of Science, 1200 New York Avenue, NW Washington DC 20005 USA VL - 332 IS - 6028 SN - 0036-8075, 0036-8075 KW - Sustainability Science Abstracts KW - Fuel technology KW - Metals KW - Oxygen KW - Cobalt KW - Platinum KW - Catalysts KW - Polymers KW - Iron KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/904469752?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science+%28Washington%29&rft.atitle=High-Performance+Electrocatalysts+for+Oxygen+Reduction+Derived+from+Polyaniline%2C+Iron%2C+and+Cobalt&rft.au=Wu%2C+Gang%3BMore%2C+Karren+L%3BJohnston%2C+Christina+M%3BZelenay%2C+Piotr&rft.aulast=Wu&rft.aufirst=Gang&rft.date=2011-04-22&rft.volume=332&rft.issue=6028&rft.spage=443&rft.isbn=&rft.btitle=&rft.title=Science+%28Washington%29&rft.issn=00368075&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-11-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Oxygen; Metals; Fuel technology; Cobalt; Platinum; Catalysts; Polymers; Iron ER - TY - JOUR T1 - Mechanistic study of silver nanoparticle formation on conducting polymer surfaces. AN - 861786756; 21434643 AB - Conducting polymer (polyaniline) sheets are shown to be active substrates to promote the growth of nanostructured silver thin films with highly tunable morphologies. Using the spontaneous electroless deposition of silver, we show that a range of nanostructured metallic features can be controllably and reproducibly formed over large surface areas. The structural morphology of the resulting metal-polymer nanocomposite is demonstrated to be sensitive to experimental parameters such as ion concentration, temperature, and polymer processing and can range from densely packed oblate nanosheets to bulk crystalline metals. The deposition mechanisms are explained using a diffusion-limited aggregation (DLA) model to describe the semi-fractal-like growth of the metal nanostructures. We find these composite films to exhibit strong surface-enhanced Raman (SERS) activity, and the nanostructured features are optimized with respect to SERS activity using a self-assembled monolayer of mercapto-benzoic acid as a model Raman reporter. SERS enhancements are estimated to be on the order of 10(7). Through micro-Raman SERS mapping, these materials are shown to exhibit uniform SERS responses over macroscopic areas. These metal-polymer nanocomposites benefit from the underlying polymer's processability to yield SERS-active materials of almost limitless shape and size and show significant promise for future SERS-based sensing and detection schemes. JF - Langmuir : the ACS journal of surfaces and colloids AU - Mack, Nathan H AU - Bailey, James A AU - Doorn, Stephen K AU - Chen, Chien-An AU - Gau, Han-Mou AU - Xu, Ping AU - Williams, Darrick J AU - Akhadov, Elshan A AU - Wang, Hsing-Lin AD - Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. Y1 - 2011/04/19/ PY - 2011 DA - 2011 Apr 19 SP - 4979 EP - 4985 VL - 27 IS - 8 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/861786756?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Langmuir+%3A+the+ACS+journal+of+surfaces+and+colloids&rft.atitle=Mechanistic+study+of+silver+nanoparticle+formation+on+conducting+polymer+surfaces.&rft.au=Mack%2C+Nathan+H%3BBailey%2C+James+A%3BDoorn%2C+Stephen+K%3BChen%2C+Chien-An%3BGau%2C+Han-Mou%3BXu%2C+Ping%3BWilliams%2C+Darrick+J%3BAkhadov%2C+Elshan+A%3BWang%2C+Hsing-Lin&rft.aulast=Mack&rft.aufirst=Nathan&rft.date=2011-04-19&rft.volume=27&rft.issue=8&rft.spage=4979&rft.isbn=&rft.btitle=&rft.title=Langmuir+%3A+the+ACS+journal+of+surfaces+and+colloids&rft.issn=1520-5827&rft_id=info:doi/10.1021%2Fla103644j LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2011-08-26 N1 - Date created - 2011-04-12 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/la103644j ER - TY - JOUR T1 - The Role of Regional SST Warming Variations in the Drying of Meso-America in Future Climate Projections AN - 883029556; 15294851 AB - This paper addresses several hypotheses designed to explain why AOGCM simulations of future climate in the third phase of the Coupled Model Intercomparison Project (CMIP3) feature an intensified reduction of precipitation over the Meso-America (MA) region. While the drying is consistent with an amplification of the subtropical high pressure cells and an equatorward contraction of convective regions due to the "upped ante" for convection in a warmer atmosphere, the physical mechanisms behind the intensity and robustness of the MA drying signal have not been fully explored. Regional variations in sea surface temperature (SST) warming may play a role. First, SSTs over the tropical North Atlantic (TNA) do not warm as much as the surrounding ocean. The troposphere senses a TNA that is cooler than the tropical Pacific, potentially exciting a Gill-type response, increasing the strength of the North Atlantic subtropical high. Second, the warm ENSO-like state simulated in the eastern tropical Pacific could decrease precipitation over MA, as warm ENSO events are associated with drying over MA. The authors use the International Centre for Theoretical Physics (ICTP) AGCM to investigate the effects of these regional SST warming variations on the projected drying over MA. First, the change of SSTs [Special Report on Emissions Scenarios (SRES) A1B's Twentieth-Century Climate in Coupled Model (A1B-20C)] in the ensemble average of the CMIP3 models is applied to determine if the ICTP AGCM can replicate the future drying. Then the effects of 1) removing the reduced warming over the TNA, 2) removing the warm ENSO-event-like pattern in the eastern tropical Pacific, and 3) applying uniform SST warming throughout the tropics are tested. The ICTP AGCM can reproduce the general pattern and amount of precipitation over MA. Simulations in which the CMIP3 A1B-20C ensemble-average SSTs are added to climatological SSTs show drying of more than 20% over the MA region, similar to the CMIP3 ensemble average. Replacing the relatively cooler SSTs over the TNA excites a Gill response consistent with an off-equatorial heating anomaly, showing that the TNA relative cooling is responsible for about 16% (31%) of the drying in late spring (early summer). The warm ENSO-like SST pattern over the eastern Pacific also affects precipitation over the MA region, with changes of 19% and 31% in March-June (MMJ) and June-August (JJA), respectively. This work highlights the importance of understanding even robust signals in the CMIP3 future scenario simulations, and should aid in the design and analysis of future climate change studies over the region. JF - Journal of Climate AU - Rauscher, Sara A AU - Kucharski, Fred AU - Enfield, David B AD - T-3 Fluid Dynamics, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, rauscher@lanl.gov Y1 - 2011/04// PY - 2011 DA - April 2011 SP - 2003 EP - 2016 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 24 IS - 7 SN - 0894-8755, 0894-8755 KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts; Sustainability Science Abstracts; Oceanic Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Regional effects KW - Sea surface temperature KW - Climate change KW - ENSO KW - Atlantic Ocean KW - Tropical variability KW - Convection KW - Atmospheric pollution models KW - Rainfall KW - Convection development KW - IS, Tropical Pacific KW - Emissions KW - Ocean-atmosphere system KW - Sea surface temperatures KW - Gills KW - Marine KW - Climate models KW - Simulation KW - Drying KW - Troposphere KW - Precipitation KW - AN, North Atlantic KW - convection KW - Southern Oscillation KW - Surface temperature KW - Atmosphere-ocean coupled models KW - Numerical simulations KW - Oceans KW - Tropical environments KW - El Nino-Southern Oscillation event KW - summer KW - Regional variations KW - Future climates KW - Q2 09243:Structure, mechanics and thermodynamics KW - P 0000:AIR POLLUTION KW - M3 1010:Issues in Sustainable Development KW - M2 551.588:Environmental Influences (551.588) KW - Q5 08502:Methods and instruments KW - O 2070:Meteorology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/883029556?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aasfaaquaticpollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Climate&rft.atitle=The+Role+of+Regional+SST+Warming+Variations+in+the+Drying+of+Meso-America+in+Future+Climate+Projections&rft.au=Rauscher%2C+Sara+A%3BKucharski%2C+Fred%3BEnfield%2C+David+B&rft.aulast=Rauscher&rft.aufirst=Sara&rft.date=2011-04-01&rft.volume=24&rft.issue=7&rft.spage=2003&rft.isbn=&rft.btitle=&rft.title=Journal+of+School+Leadership&rft.issn=10526846&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-08-01 N1 - Number of references - 65 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Convection; Climate change; Ocean-atmosphere system; Troposphere; Drying; Regional variations; Gills; Surface temperature; Southern Oscillation; Atmosphere-ocean coupled models; Atmospheric pollution models; Climate models; Numerical simulations; El Nino-Southern Oscillation event; Convection development; Precipitation; Sea surface temperatures; Future climates; Oceans; Rainfall; Tropical environments; Emissions; summer; Simulation; convection; AN, North Atlantic; IS, Tropical Pacific; Marine DO - http://dx.doi.org/10.1175/2010JCLI3536.1 ER - TY - JOUR T1 - On the ratio of wind-to-water-driven sediment transport; conserving soil under global change-type extreme events AN - 881455007; 2011-064240 JF - Journal of Soil and Water Conservation AU - Field, Jason P AU - Breshears, David D AU - Whicker, Jeffrey J AU - Zou, Chris B Y1 - 2011/04// PY - 2011 DA - April 2011 SP - 51A EP - 56A PB - Soil Conservation Society of America, Ankeny, IA VL - 66 IS - 2 SN - 0022-4561, 0022-4561 KW - soils KW - sediment transport KW - erosion KW - water transport KW - statistical analysis KW - sedimentation KW - agriculture KW - global change KW - vegetation KW - climate change KW - natural resources KW - transport KW - conservation KW - wind transport KW - soil erosion KW - land use KW - climate KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/881455007?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Soil+and+Water+Conservation&rft.atitle=On+the+ratio+of+wind-to-water-driven+sediment+transport%3B+conserving+soil+under+global+change-type+extreme+events&rft.au=Field%2C+Jason+P%3BBreshears%2C+David+D%3BWhicker%2C+Jeffrey+J%3BZou%2C+Chris+B&rft.aulast=Field&rft.aufirst=Jason&rft.date=2011-04-01&rft.volume=66&rft.issue=2&rft.spage=51A&rft.isbn=&rft.btitle=&rft.title=Journal+of+Soil+and+Water+Conservation&rft.issn=00224561&rft_id=info:doi/10.2489%2Fjswc.66.2.51A L2 - http://www.jswconline.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2011-01-01 N1 - Number of references - 25 N1 - PubXState - IA N1 - Document feature - illus. N1 - Last updated - 2012-06-07 N1 - CODEN - JSWCA3 N1 - SubjectsTermNotLitGenreText - agriculture; climate; climate change; conservation; erosion; global change; land use; natural resources; sediment transport; sedimentation; soil erosion; soils; statistical analysis; transport; vegetation; water transport; wind transport DO - http://dx.doi.org/10.2489/jswc.66.2.51A ER - TY - JOUR T1 - A comparison of the Covariance Matrix Adaptation Evolution Strategy and the Levenberg-Marquardt method for solving multidimensional inverse transport problems AN - 864412153; 14363126 AB - The Covariance Matrix Adaptation Evolution Strategy (CMA-ES), a powerful optimization algorithm that mimics the process of evolution in nature, is applied to the inverse transport problems of interface location identification, source composition identification, and material mass density identification (both separately and combined) in cylindrical radioactive source/shield systems. The energies of discrete gamma-ray lines emitted by the source are assumed to be known, while the uncollided line fluxes are assumed to be measured at points external to the system. CMA-ES is compared to the Levenberg-Marquardt method, a standard gradient-based optimization algorithm, on numerical test cases using both simulated data that is perfectly consistent with the optimization process and with realistic data simulated by Monte Carlo. Numerical results indicate that the Levenberg-Marquardt method is more adept at problems with few unknowns (i.e. a[copy[frac12]3), but as the number of unknowns increases, CMA-ES becomes the superior strategy. Results also indicate that a parallel version of CMA-ES would be more robust than, and have competitive run times with, the Levenberg-Marquardt method for many inverse transport problems. JF - Annals of Nuclear Energy AU - Bledsoe, Keith C AU - Favorite, Jeffrey A AU - Aldemir, Tunc AD - XCP-7, MS P365, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Y1 - 2011/04// PY - 2011 DA - Apr 2011 SP - 897 EP - 904 PB - Elsevier Science, P.O. Box 800 Kidlington Oxford OX5 1DX UK VL - 38 IS - 4 SN - 0306-4549, 0306-4549 KW - Pollution Abstracts; Environment Abstracts KW - Covariance Matrix Adaptation Evolution Strategy KW - Levenberg-Marquardt method KW - Inverse transport KW - Passive gamma rays KW - Monte Carlo simulation KW - Nuclear energy KW - adaptability KW - ENA 03:Energy KW - P 8000:RADIATION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/864412153?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Annals+of+Nuclear+Energy&rft.atitle=A+comparison+of+the+Covariance+Matrix+Adaptation+Evolution+Strategy+and+the+Levenberg-Marquardt+method+for+solving+multidimensional+inverse+transport+problems&rft.au=Bledsoe%2C+Keith+C%3BFavorite%2C+Jeffrey+A%3BAldemir%2C+Tunc&rft.aulast=Bledsoe&rft.aufirst=Keith&rft.date=2011-04-01&rft.volume=38&rft.issue=4&rft.spage=897&rft.isbn=&rft.btitle=&rft.title=Annals+of+Nuclear+Energy&rft.issn=03064549&rft_id=info:doi/10.1016%2Fj.anucene.2010.09.014 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-07-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Monte Carlo simulation; Nuclear energy; adaptability DO - http://dx.doi.org/10.1016/j.anucene.2010.09.014 ER - TY - JOUR T1 - Isotopic and elemental fractionation of solar wind implanted in the Genesis concentrator target characterized and quantified by noble gases AN - 1312834795; 2013-020782 AB - We report concentrations and isotopic compositions of He, Ne, and Ar measured with high spatial resolution along a radial traverse of a silicon carbide (SiC) quadrant of the Genesis mission concentrator target. The Ne isotopic composition maps instrumental fractionation as a function of radial position in the target: the maximum observed isotopic fractionation is approximately 33 ppm per mass unit between the center and periphery. The Ne fluence is enhanced by a factor of 43 at the target center and decreases to 5.5 times at the periphery relative to the bulk solar wind fluence. Neon isotopic profiles measured along all four arms of the "gold cross" mount which held the quadrants in the concentrator target demonstrate that the concentrator target was symmetrically irradiated during operation as designed. We used implantation experiments of Ne into SiC and gold to quantify backscatter loss and isotopic fractionation and compared measurements with numerical simulations from the code "stopping and range of ions in matter." The (super 20) Ne fluence curve as a function of radial distance on the target may be used to construct concentration factors relative to bulk solar wind for accurate corrections for solar wind fluences of other light elements to be measured in the concentrator target. The Ne isotopic composition as a function of the radial distance in the SiC quadrant provides a correction for the instrumental mass-dependent isotopic fractionation by the concentrator and can be used to correct measured solar wind oxygen and nitrogen isotopic compositions to obtain bulk solar wind isotopic compositions. JF - Meteoritics & Planetary Science AU - Heber, Veronika S AU - Wiens, Roger C AU - Juresicz, Amy J G AU - Vogel, Nadia AU - Reisenfeld, Daniel B AU - Baur, Heinrich AU - McKeegan, Kevin D AU - Wieler, Rainer AU - Burnett, Donald S Y1 - 2011/04// PY - 2011 DA - April 2011 SP - 493 EP - 512 PB - Meteoritical Society, Fayetteville, AR VL - 46 IS - 4 SN - 1086-9379, 1086-9379 KW - isotope fractionation KW - experimental studies KW - N-15/N-14 KW - irradiation KW - Genesis Mission KW - oxygen KW - isotopes KW - isotope ratios KW - solar wind KW - O-18/O-16 KW - Ne-22/Ne-20 KW - stable isotopes KW - nitrogen KW - argon KW - noble gases KW - neon KW - helium KW - backscattering KW - O-17/O-16 KW - chemical fractionation KW - 04:Extraterrestrial geology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312834795?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Isotopic+and+elemental+fractionation+of+solar+wind+implanted+in+the+Genesis+concentrator+target+characterized+and+quantified+by+noble+gases&rft.au=Heber%2C+Veronika+S%3BWiens%2C+Roger+C%3BJuresicz%2C+Amy+J+G%3BVogel%2C+Nadia%3BReisenfeld%2C+Daniel+B%3BBaur%2C+Heinrich%3BMcKeegan%2C+Kevin+D%3BWieler%2C+Rainer%3BBurnett%2C+Donald+S&rft.aulast=Heber&rft.aufirst=Veronika&rft.date=2011-04-01&rft.volume=46&rft.issue=4&rft.spage=493&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/10.1111%2Fj.1945-5100.2011.01170.x L2 - http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 20 N1 - PubXState - AR N1 - Document feature - illus. incl. 8 tables N1 - Last updated - 2013-02-28 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - argon; backscattering; chemical fractionation; experimental studies; Genesis Mission; helium; irradiation; isotope fractionation; isotope ratios; isotopes; N-15/N-14; Ne-22/Ne-20; neon; nitrogen; noble gases; O-17/O-16; O-18/O-16; oxygen; solar wind; stable isotopes DO - http://dx.doi.org/10.1111/j.1945-5100.2011.01170.x ER - TY - JOUR T1 - Homogenization of hydraulic conductivity for hierarchical sedimentary deposits at multiple scales AN - 1270038630; 2013-008931 AB - Based on a three-dimensional heterogeneous aquifer model exhibiting non-stationary, statistically anisotropic correlation, three hydrostratigraphic models (HSMs) are created within a sedimentary hierarchy. A geostatistical analysis of natural log conductivity (lnK) is conducted for the units of the HSMs. Hydraulic conductivity is then upscaled using numerical and analytical methods. Increasing lnK variances are evaluated. Results suggest that for the aquifer model tested: (1) the numerical method is capable of upscaling irregular domains with reasonable accuracy for a lnK variance up to 7.0. (2) Accuracy of the upscaled equivalent conductivities (K*) and associated performance of the HSMs are sensitive to homogenization level, heterogeneity variance, and boundary condition. Variance is found to be the most significant factor impacting the accuracy of the HSMs. (3) Diagonal tensor appears a good approximation for the full-tensor K*. (4) For the HSM units, when the variance is low (less than 1.0), all analytical methods are nearly equally accurate; however, when variance becomes higher, analytical methods generally are less accurate. Copyright 2011 Springer Science+Business Media B.V. JF - Transport in Porous Media AU - Zhang, Ye AU - Liu, Baozhong AU - Gable, Carl W Y1 - 2011/04// PY - 2011 DA - April 2011 SP - 717 EP - 737 PB - Springer, Dordrecht VL - 87 IS - 3 SN - 0169-3913, 0169-3913 KW - numerical models KW - hydrostratigraphy KW - heterogeneous materials KW - three-dimensional models KW - variance analysis KW - homogenization KW - statistical analysis KW - hydraulic conductivity KW - boundary conditions KW - ground water KW - aquifers KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270038630?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transport+in+Porous+Media&rft.atitle=Homogenization+of+hydraulic+conductivity+for+hierarchical+sedimentary+deposits+at+multiple+scales&rft.au=Zhang%2C+Ye%3BLiu%2C+Baozhong%3BGable%2C+Carl+W&rft.aulast=Zhang&rft.aufirst=Ye&rft.date=2011-04-01&rft.volume=87&rft.issue=3&rft.spage=717&rft.isbn=&rft.btitle=&rft.title=Transport+in+Porous+Media&rft.issn=01693913&rft_id=info:doi/10.1007%2Fs11242-010-9711-8 L2 - http://springerlink.metapress.com/(l4tqdq55jga2hgb0achos1qm)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:100342,1 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2013-01-01 N1 - Number of references - 25 N1 - Document feature - illus. N1 - SuppNotes - Based on Publisher-supplied data N1 - Last updated - 2013-01-17 N1 - SubjectsTermNotLitGenreText - aquifers; boundary conditions; ground water; heterogeneous materials; homogenization; hydraulic conductivity; hydrostratigraphy; numerical models; statistical analysis; three-dimensional models; variance analysis DO - http://dx.doi.org/10.1007/s11242-010-9711-8 ER - TY - CPAPER T1 - Effect of Debonded Interfaces on Corrosion of Mild Steel Composites in Supercritical CO2-Saturated Brines T2 - 66th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2011) AN - 1312990763; 6044767 JF - 66th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2011) AU - Han, Jiabin AU - Carey, J AU - Zhang, Jinsuo Y1 - 2011/03/13/ PY - 2011 DA - 2011 Mar 13 KW - Corrosion KW - Brines KW - Steel UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312990763?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.atitle=Effect+of+Debonded+Interfaces+on+Corrosion+of+Mild+Steel+Composites+in+Supercritical+CO2-Saturated+Brines&rft.au=Han%2C+Jiabin%3BCarey%2C+J%3BZhang%2C+Jinsuo&rft.aulast=Han&rft.aufirst=Jiabin&rft.date=2011-03-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://nace.confex.com/nace/2011/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Non-Aqueous Anodization of Aluminum Beryllium Alloys T2 - 66th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2011) AN - 1312990741; 6044305 JF - 66th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2011) AU - Lillard, R Y1 - 2011/03/13/ PY - 2011 DA - 2011 Mar 13 KW - Aluminum KW - Beryllium KW - Alloys KW - alloys UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312990741?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.atitle=Non-Aqueous+Anodization+of+Aluminum+Beryllium+Alloys&rft.au=Lillard%2C+R&rft.aulast=Lillard&rft.aufirst=R&rft.date=2011-03-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://nace.confex.com/nace/2011/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Corrosion and Passivity Behavior of Technetium Waste Forms Exposed to Various Aqueous Environments T2 - 66th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2011) AN - 1312986318; 6044317 JF - 66th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2011) AU - Kolman, David AU - Jarvinen, Gordon AU - Moore, David AU - Goff, George AU - Gibson, Rowena AU - Cisneros, Mike AU - Taylor, Christopher AU - Mausolf, Edward AU - Czerwinski, Kenneth AU - Weck, Philippe AU - Kim, Eunja Y1 - 2011/03/13/ PY - 2011 DA - 2011 Mar 13 KW - Technetium KW - Corrosion KW - Wastes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312986318?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.atitle=Corrosion+and+Passivity+Behavior+of+Technetium+Waste+Forms+Exposed+to+Various+Aqueous+Environments&rft.au=Kolman%2C+David%3BJarvinen%2C+Gordon%3BMoore%2C+David%3BGoff%2C+George%3BGibson%2C+Rowena%3BCisneros%2C+Mike%3BTaylor%2C+Christopher%3BMausolf%2C+Edward%3BCzerwinski%2C+Kenneth%3BWeck%2C+Philippe%3BKim%2C+Eunja&rft.aulast=Kolman&rft.aufirst=David&rft.date=2011-03-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://nace.confex.com/nace/2011/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - A Corrosion Control Concept by Scale Engineering: A Novel Green Inhibitor Applied to High Temperature and Pressure Aqueous Supercritical CO2 Systems T2 - 66th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2011) AN - 1312901062; 6044586 JF - 66th Annual Meeting of the National Association of Corrosion Engineering (CORROSION 2011) AU - Han, Jiabin AU - Carey, J AU - Zhang, Jinsuo Y1 - 2011/03/13/ PY - 2011 DA - 2011 Mar 13 KW - Corrosion control KW - high temperature KW - Carbon dioxide KW - Temperature effects KW - Pressure KW - Inhibitors UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312901062?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=66th+Annual+Meeting+of+the+National+Association+of+Corrosion+Engineering+%28CORROSION+2011%29&rft.atitle=A+Corrosion+Control+Concept+by+Scale+Engineering%3A+A+Novel+Green+Inhibitor+Applied+to+High+Temperature+and+Pressure+Aqueous+Supercritical+CO2+Systems&rft.au=Ing%2C+Marsha&rft.aulast=Ing&rft.aufirst=Marsha&rft.date=2013-09-01&rft.volume=23&rft.issue=5&rft.spage=846&rft.isbn=&rft.btitle=&rft.title=Journal+of+School+Leadership&rft.issn=10526846&rft_id=info:doi/ L2 - http://nace.confex.com/nace/2011/webprogram/meeting.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Variations on Kolmogorov flow: turbulent energy dissipation and mean flow profiles AN - 860383568; 14386504 AB - The relation between the form of a body force driving a turbulent shear flow and the dissipation factor ?? = ?????/U3 is investigated by means of rigorous upper bound analysis and direct numerical simulation. We consider unidirectional steady forcing functions in a three-dimensional periodic domain and observe that a rigorous infinite Reynolds number bound on ?? displays the same qualitative behaviour as the computationally measured dissipation factor at finite Reynolds number as the force profile is varied. We also compare the measured mean flow profiles with the Stokes flow profile for the same forcing. The mean and Stokes flow profiles are strikingly similar at the Reynolds numbers obtained in the numerical simulations, lending quantitative credence to the notion of a turbulent eddy viscosity. JF - Journal of Fluid Mechanics AU - Rollin, B AU - DUBIEF, Y AU - Doering, C R AD - School of Engineering, University of Vermont, Burlington, VT 05405, USA, bertrand@lanl.gov Y1 - 2011/03/10/ PY - 2011 DA - 2011 Mar 10 SP - 204 EP - 213 PB - Cambridge University Press, The Edinburgh Building, Cambridge CB2 2RU UK VL - 670 SN - 0022-1120, 0022-1120 KW - ASFA 2: Ocean Technology Policy & Non-Living Resources; Aqualine Abstracts; Water Resources Abstracts; Meteorological & Geoastrophysical Abstracts KW - Reynolds Number KW - Flow Profiles KW - Fluid mechanics KW - Viscosity KW - Eddy kinetic energy KW - Turbulent energy dissipation KW - Reynolds number KW - Shear KW - Simulation Analysis KW - Energy Dissipation KW - Fluid Mechanics KW - Eddies KW - Numerical simulations KW - Profiles KW - Eddy viscosity KW - Turbulent shear flow KW - AQ 00001:Water Resources and Supplies KW - Q2 09169:Fluid mechanics KW - M2 551.511:Mechanics and Thermodynamics of the Atmosphere (551.511) KW - SW 6010:Structures UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/860383568?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Fluid+Mechanics&rft.atitle=Variations+on+Kolmogorov+flow%3A+turbulent+energy+dissipation+and+mean+flow+profiles&rft.au=Rollin%2C+B%3BDUBIEF%2C+Y%3BDoering%2C+C+R&rft.aulast=Rollin&rft.aufirst=B&rft.date=2011-03-10&rft.volume=670&rft.issue=&rft.spage=204&rft.isbn=&rft.btitle=&rft.title=Journal+of+Fluid+Mechanics&rft.issn=00221120&rft_id=info:doi/10.1017%2FS0022112010006294 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-04-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Fluid mechanics; Eddy kinetic energy; Reynolds number; Eddy viscosity; Turbulent shear flow; Numerical simulations; Turbulent energy dissipation; Shear; Flow Profiles; Eddies; Viscosity; Profiles; Simulation Analysis; Reynolds Number; Energy Dissipation; Fluid Mechanics DO - http://dx.doi.org/10.1017/S0022112010006294 ER - TY - JOUR T1 - Importance of feedback loops between soil inorganic nitrogen and microbial communities in the heterotrophic soil respiration response to global warming AN - 926879286; 14381115 JF - Nature Reviews: Microbiology AU - Xu, Chonggang AU - Liang, Chao AU - Wullschleger, Stan AU - Wilson, Cathy AU - McDowell, Nathan AD - Division of Earth and Environmental Sciences, Los Alamos National Laboratory, Los Alamos, New Mexico 187545, USA. Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 222 PB - Nature Publishing Group, The Macmillan Building London N1 9XW UK VL - 9 IS - 3 SN - 1740-1526, 1740-1526 KW - Sustainability Science Abstracts KW - Soil KW - Reviews KW - Respiration KW - Climate change KW - Global warming KW - Greenhouse effect KW - Microbial activity KW - Nitrogen KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/926879286?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+Reviews%3A+Microbiology&rft.atitle=Importance+of+feedback+loops+between+soil+inorganic+nitrogen+and+microbial+communities+in+the+heterotrophic+soil+respiration+response+to+global+warming&rft.au=Xu%2C+Chonggang%3BLiang%2C+Chao%3BWullschleger%2C+Stan%3BWilson%2C+Cathy%3BMcDowell%2C+Nathan&rft.aulast=Xu&rft.aufirst=Chonggang&rft.date=2011-03-01&rft.volume=9&rft.issue=3&rft.spage=222&rft.isbn=&rft.btitle=&rft.title=Nature+Reviews%3A+Microbiology&rft.issn=17401526&rft_id=info:doi/10.1038%2Fnrmicro2439-c1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-03-01 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Soil; Respiration; Reviews; Climate change; Global warming; Microbial activity; Greenhouse effect; Nitrogen DO - http://dx.doi.org/10.1038/nrmicro2439-c1 ER - TY - JOUR T1 - Revised source parameters for pNEs in the Sakha Republic (Yakutia), Russia AN - 911679167; 2012-006799 JF - Seismological Research Letters AU - Fujita, K AU - Mackey, K G AU - Hartse, H AU - Jih, R S AU - Magnani, M Beatrice AU - Langston, Chuck Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 352 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - technology KW - Commonwealth of Independent States KW - ground truth KW - seismicity KW - Yakutia Russian Federation KW - Russian Federation KW - seismic sources KW - Asia KW - satellite methods KW - remote sensing KW - 19:Seismology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/911679167?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Revised+source+parameters+for+pNEs+in+the+Sakha+Republic+%28Yakutia%29%2C+Russia&rft.au=Fujita%2C+K%3BMackey%2C+K+G%3BHartse%2C+H%3BJih%2C+R+S%3BMagnani%2C+M+Beatrice%3BLangston%2C+Chuck&rft.aulast=Fujita&rft.aufirst=K&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=352&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - Asia; Commonwealth of Independent States; ground truth; remote sensing; Russian Federation; satellite methods; seismic sources; seismicity; technology; Yakutia Russian Federation ER - TY - JOUR T1 - Seismo-acoustic wavefield characterization of the January 3, 2011 M (sub L) 4.6 Circleville earthquake in Utah AN - 911678831; 2012-006796 JF - Seismological Research Letters AU - Burlacu, R AU - Arrowsmith, S J AU - Pankow, K L AU - Koper, K D AU - Hale, J M AU - Stump, B W AU - Hayward, C AU - Magnani, M Beatrice AU - Langston, Chuck Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 351 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - United States KW - technology KW - monitoring KW - magnitude KW - data processing KW - computer programs KW - aftershocks KW - Circleville earthquake 2011 KW - seismicity KW - Utah KW - infrasound KW - earthquakes KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/911678831?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Seismo-acoustic+wavefield+characterization+of+the+January+3%2C+2011+M+%28sub+L%29+4.6+Circleville+earthquake+in+Utah&rft.au=Burlacu%2C+R%3BArrowsmith%2C+S+J%3BPankow%2C+K+L%3BKoper%2C+K+D%3BHale%2C+J+M%3BStump%2C+B+W%3BHayward%2C+C%3BMagnani%2C+M+Beatrice%3BLangston%2C+Chuck&rft.aulast=Burlacu&rft.aufirst=R&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=351&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - Seismological Society of America 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - aftershocks; Circleville earthquake 2011; computer programs; data processing; earthquakes; infrasound; magnitude; monitoring; seismicity; technology; United States; Utah ER - TY - JOUR T1 - A method to infer material properties and M (sub b) bias of the North Korean test site using yield; depth-of-burial tradeoff curves and {M (sub b) -M (sub s) } double differences AN - 907924616; 2012-002960 JF - Seismological Research Letters AU - Patton, H J AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 347 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - Far East KW - double-difference method KW - materials KW - explosions KW - magnitude KW - North Korea KW - properties KW - Korea KW - Asia KW - earthquakes KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907924616?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+School+Leadership&rft.atitle=Educator-Peer+Workplace+Bullying%3A+Why+Leadership+Must+Address+Incivility+and+Create+a+Quilt+of+Caring+in+the+School&rft.au=Gray%2C+Nancy+L.%3BGardiner%2C+Mary+E.&rft.aulast=Gray&rft.aufirst=Nancy&rft.date=2013-09-01&rft.volume=23&rft.issue=5&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+School+Leadership&rft.issn=10526846&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - Asia; double-difference method; earthquakes; explosions; Far East; Korea; magnitude; materials; North Korea; properties ER - TY - JOUR T1 - Some reflections on the seismo-acoustic wavefield AN - 907923153; 2012-002882 JF - Seismological Research Letters AU - Whitaker, R W AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 331 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - technology KW - monitoring KW - seismicity KW - explosions KW - infrasound KW - nuclear explosions KW - wave fields KW - information management KW - earthquakes KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907923153?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Some+reflections+on+the+seismo-acoustic+wavefield&rft.au=Whitaker%2C+R+W%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Whitaker&rft.aufirst=R&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=331&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - earthquakes; explosions; information management; infrasound; monitoring; nuclear explosions; seismicity; technology; wave fields ER - TY - JOUR T1 - Exploring the relative merits of signal classification methods; application to volcanic unrest AN - 907922458; 2012-000308 JF - Seismological Research Letters AU - Rowe, C A AU - Falsaperla, S AU - Maceira, M AU - Langer, H AU - Behncke, B AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 283 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - geologic hazards KW - statistical analysis KW - signals KW - seismicity KW - seismic risk KW - classification KW - natural hazards KW - volcanic earthquakes KW - risk assessment KW - probability KW - applications KW - earthquakes KW - 19:Seismology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907922458?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Exploring+the+relative+merits+of+signal+classification+methods%3B+application+to+volcanic+unrest&rft.au=Rowe%2C+C+A%3BFalsaperla%2C+S%3BMaceira%2C+M%3BLanger%2C+H%3BBehncke%2C+B%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Rowe&rft.aufirst=C&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=283&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - applications; classification; earthquakes; geologic hazards; natural hazards; probability; risk assessment; seismic risk; seismicity; signals; statistical analysis; volcanic earthquakes ER - TY - JOUR T1 - Advanced multivariate inversion techniques and its application to northwest China velocity structure AN - 907922285; 2012-000435 JF - Seismological Research Letters AU - Maceira, M AU - Zhang, H AU - Rowe, C A AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 309 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - upper mantle KW - P-waves KW - body waves KW - Far East KW - statistical analysis KW - mantle KW - GRACE KW - elastic waves KW - satellite methods KW - multivariate analysis KW - velocity structure KW - northwestern China KW - seismic waves KW - Asia KW - lower crust KW - S-waves KW - crust KW - China KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907922285?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Advanced+multivariate+inversion+techniques+and+its+application+to+northwest+China+velocity+structure&rft.au=Maceira%2C+M%3BZhang%2C+H%3BRowe%2C+C+A%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Maceira&rft.aufirst=M&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=309&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - Asia; body waves; China; crust; elastic waves; Far East; GRACE; lower crust; mantle; multivariate analysis; northwestern China; P-waves; S-waves; satellite methods; seismic waves; statistical analysis; upper mantle; velocity structure ER - TY - JOUR T1 - Uncertainty assessment of time-reversal location of the Hemet tremor source AN - 907922246; 2012-000429 JF - Seismological Research Letters AU - Larmat, Carene S AU - Johnson, P A AU - Guyer, R A AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 307 EP - 308 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - United States KW - three-dimensional models KW - magnitude KW - Riverside County California KW - Hemet California KW - models KW - California KW - propagation KW - tectonics KW - earthquakes KW - uncertainty KW - seismotectonics KW - faults KW - crust KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907922246?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Uncertainty+assessment+of+time-reversal+location+of+the+Hemet+tremor+source&rft.au=Larmat%2C+Carene+S%3BJohnson%2C+P+A%3BGuyer%2C+R+A%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Larmat&rft.aufirst=Carene&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=307&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - California; crust; earthquakes; faults; Hemet California; magnitude; models; propagation; Riverside County California; seismotectonics; tectonics; three-dimensional models; uncertainty; United States ER - TY - JOUR T1 - Constraining Pn geometric spreading with observed amplitudes in Asia AN - 907922153; 2012-000361 JF - Seismological Research Letters AU - Yang, X AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 294 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - models KW - body waves KW - attenuation KW - velocity structure KW - Pn-waves KW - elastic waves KW - seismic waves KW - crust KW - amplitude KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907922153?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Constraining+Pn+geometric+spreading+with+observed+amplitudes+in+Asia&rft.au=Yang%2C+X%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Yang&rft.aufirst=X&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=294&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - amplitude; attenuation; body waves; crust; elastic waves; models; Pn-waves; seismic waves; velocity structure ER - TY - JOUR T1 - Uppermost mantle velocity structure beneath the Southern Rocky Mountains from simultaneous inversion of teleseismic and gravity data AN - 907922015; 2012-000438 JF - Seismological Research Letters AU - MacCarthy, J K AU - Aster, R C A AU - Stachnik, J C S AU - Hansen, S M H AU - Dueker, K AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 309 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - upper mantle KW - North America KW - geophysical surveys KW - lithosphere KW - geophysical methods KW - mantle KW - elastic waves KW - Colorado Rockies Experiment and Seismic Transects KW - teleseismic signals KW - gravity methods KW - Southern Rocky Mountains KW - velocity structure KW - traveltime KW - surveys KW - Rocky Mountains KW - crust KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907922015?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Uppermost+mantle+velocity+structure+beneath+the+Southern+Rocky+Mountains+from+simultaneous+inversion+of+teleseismic+and+gravity+data&rft.au=MacCarthy%2C+J+K%3BAster%2C+R+C+A%3BStachnik%2C+J+C+S%3BHansen%2C+S+M+H%3BDueker%2C+K%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=MacCarthy&rft.aufirst=J&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=309&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - Colorado Rockies Experiment and Seismic Transects; crust; elastic waves; geophysical methods; geophysical surveys; gravity methods; lithosphere; mantle; North America; Rocky Mountains; Southern Rocky Mountains; surveys; teleseismic signals; traveltime; upper mantle; velocity structure ER - TY - JOUR T1 - Multiple geophysical imaging of the Utah area using seismic and gravity data AN - 907921988; 2012-000437 JF - Seismological Research Letters AU - Zhang, H AU - Maceira, M AU - Toksoz, M N AU - Benson, T AU - Yu, H AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 309 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - United States KW - geophysical surveys KW - geophysical methods KW - data processing KW - depth KW - seismic methods KW - models KW - gravity methods KW - velocity structure KW - data bases KW - surveys KW - Utah KW - crust KW - 18:Solid-earth geophysics KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907921988?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Multiple+geophysical+imaging+of+the+Utah+area+using+seismic+and+gravity+data&rft.au=Zhang%2C+H%3BMaceira%2C+M%3BToksoz%2C+M+N%3BBenson%2C+T%3BYu%2C+H%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Zhang&rft.aufirst=H&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=309&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - crust; data bases; data processing; depth; geophysical methods; geophysical surveys; gravity methods; models; seismic methods; surveys; United States; Utah; velocity structure ER - TY - JOUR T1 - Rift structure of East Africa from joint inversion of group velocity estimates and gravity data AN - 907921981; 2012-000436 JF - Seismological Research Letters AU - Modrak, R T AU - Maceira, A M AU - Van Wijk, J W AU - Pasyanos, M E AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 309 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - upper mantle KW - geophysical surveys KW - East Africa KW - geophysical methods KW - mantle KW - rifting KW - depth KW - gravity methods KW - plate tectonics KW - Ethiopia KW - velocity structure KW - surveys KW - Africa KW - crust KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907921981?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Rift+structure+of+East+Africa+from+joint+inversion+of+group+velocity+estimates+and+gravity+data&rft.au=Modrak%2C+R+T%3BMaceira%2C+A+M%3BVan+Wijk%2C+J+W%3BPasyanos%2C+M+E%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Modrak&rft.aufirst=R&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=309&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - Africa; crust; depth; East Africa; Ethiopia; geophysical methods; geophysical surveys; gravity methods; mantle; plate tectonics; rifting; surveys; upper mantle; velocity structure ER - TY - JOUR T1 - Regional phase amplitude tomography using absolute source constraints AN - 907920215; 2012-000352 JF - Seismological Research Letters AU - Phillips, W S AU - Fisk, M D AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 292 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - tomography KW - models KW - attenuation KW - seismicity KW - elastic waves KW - seismic response KW - amplitude KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907920215?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Regional+phase+amplitude+tomography+using+absolute+source+constraints&rft.au=Phillips%2C+W+S%3BFisk%2C+M+D%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Phillips&rft.aufirst=W&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=292&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - amplitude; attenuation; elastic waves; models; seismic response; seismicity; tomography ER - TY - JOUR T1 - Validating 3D seismic velocity models using the spectral element method AN - 907920092; 2012-000294 JF - Seismological Research Letters AU - Larmat, Carene S AU - Maceira, M AU - Rowe, C A AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 280 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - United States KW - tomography KW - technology KW - geophysical surveys KW - three-dimensional models KW - geophysical methods KW - spectral analysis KW - elastic waves KW - seismic methods KW - finite element analysis KW - Western U.S. KW - velocity structure KW - traveltime KW - surveys KW - instruments KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907920092?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Validating+3D+seismic+velocity+models+using+the+spectral+element+method&rft.au=Larmat%2C+Carene+S%3BMaceira%2C+M%3BRowe%2C+C+A%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Larmat&rft.aufirst=Carene&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=280&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - elastic waves; finite element analysis; geophysical methods; geophysical surveys; instruments; seismic methods; spectral analysis; surveys; technology; three-dimensional models; tomography; traveltime; United States; velocity structure; Western U.S. ER - TY - JOUR T1 - Calculating path-dependent travel time prediction variance and covariance for the SALA3D global tomographic P-velocity model AN - 907919610; 2012-000383 JF - Seismological Research Letters AU - Hipp, J R AU - Encarnacao, A V AU - Ballard, S AU - Young, C J AU - Chang, M C AU - Phillips, W S AU - Begnaud, M L AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 280 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - tomography KW - models KW - P-waves KW - body waves KW - seismicity KW - sampling KW - traveltime KW - velocity KW - prediction KW - elastic waves KW - seismic waves KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907919610?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Calculating+path-dependent+travel+time+prediction+variance+and+covariance+for+the+SALA3D+global+tomographic+P-velocity+model&rft.au=Hipp%2C+J+R%3BEncarnacao%2C+A+V%3BBallard%2C+S%3BYoung%2C+C+J%3BChang%2C+M+C%3BPhillips%2C+W+S%3BBegnaud%2C+M+L%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Hipp&rft.aufirst=J&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=280&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-09-16 N1 - SubjectsTermNotLitGenreText - body waves; elastic waves; models; P-waves; prediction; sampling; seismic waves; seismicity; tomography; traveltime; velocity ER - TY - JOUR T1 - Incorporating anisotropic variations in the RSTT model for the upper mantle of Eurasia AN - 907918972; 2012-000348 JF - Seismological Research Letters AU - Begnaud, M L AU - Myers, S C AU - Ballard, S AU - Phillips, W S AU - Pasyanos, M E AU - Schweig, Eugene AU - Williams, Robert Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 291 EP - 292 PB - Seismological Society of America, El Cerrito, CA VL - 82 IS - 2 SN - 0895-0695, 0895-0695 KW - upper mantle KW - patterns KW - Far East KW - mantle KW - elastic waves KW - variations KW - models KW - seismicity KW - velocity structure KW - Asia KW - arrival time KW - China KW - anisotropy KW - 18:Solid-earth geophysics KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907918972?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Seismological+Research+Letters&rft.atitle=Incorporating+anisotropic+variations+in+the+RSTT+model+for+the+upper+mantle+of+Eurasia&rft.au=Begnaud%2C+M+L%3BMyers%2C+S+C%3BBallard%2C+S%3BPhillips%2C+W+S%3BPasyanos%2C+M+E%3BSchweig%2C+Eugene%3BWilliams%2C+Robert&rft.aulast=Begnaud&rft.aufirst=M&rft.date=2011-03-01&rft.volume=82&rft.issue=2&rft.spage=291&rft.isbn=&rft.btitle=&rft.title=Seismological+Research+Letters&rft.issn=08950695&rft_id=info:doi/ L2 - http://srl.geoscienceworld.org/ LA - English DB - GeoRef N1 - Conference title - SSA 2011 annual meeting N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - PubXState - CA N1 - Last updated - 2016-10-25 N1 - SubjectsTermNotLitGenreText - anisotropy; arrival time; Asia; China; elastic waves; Far East; mantle; models; patterns; seismicity; upper mantle; variations; velocity structure ER - TY - JOUR T1 - Beyond natural antibodies: the power of in vitro display technologies AN - 874181784; 14866617 AB - In vitro display technologies, best exemplified by phage and yeast display, were first described for the selection of antibodies some 20 years ago. Since then, many antibodies have been selected and improved upon using these methods. Although it is not widely recognized, many of the antibodies derived using in vitro display methods have properties that would be extremely difficult, if not impossible, to obtain by immunizing animals. The first antibodies derived using in vitro display methods are now in the clinic, with many more waiting in the wings. Unlike immunization, in vitro display permits the use of defined selection conditions and provides immediate availability of the sequence encoding the antibody. The amenability of in vitro display to high-throughput applications broadens the prospects for their wider use in basic and applied research. JF - Nature Biotechnology AU - Bradbury, Andrew R M AU - Sidhu, Sachdev AU - Duebel, Stefan AU - McCafferty, John AD - Los Alamos National Laboratory, Los Alamos, New Mexico, USA. Y1 - 2011/03// PY - 2011 DA - Mar 2011 SP - 245 EP - 254 PB - Nature Publishing Group, The Macmillan Building London N1 9XW UK VL - 29 IS - 3 SN - 1087-0156, 1087-0156 KW - Biotechnology and Bioengineering Abstracts KW - Phages KW - Antibodies KW - Wings KW - Immunization KW - W 30910:Imaging UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/874181784?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+Biotechnology&rft.atitle=Beyond+natural+antibodies%3A+the+power+of+in+vitro+display+technologies&rft.au=Bradbury%2C+Andrew+R+M%3BSidhu%2C+Sachdev%3BDuebel%2C+Stefan%3BMcCafferty%2C+John&rft.aulast=Bradbury&rft.aufirst=Andrew+R&rft.date=2011-03-01&rft.volume=29&rft.issue=3&rft.spage=245&rft.isbn=&rft.btitle=&rft.title=Nature+Biotechnology&rft.issn=10870156&rft_id=info:doi/10.1038%2Fnbt.1791 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-06-01 N1 - Last updated - 2013-10-04 N1 - SubjectsTermNotLitGenreText - Phages; Antibodies; Wings; Immunization DO - http://dx.doi.org/10.1038/nbt.1791 ER - TY - JOUR T1 - Strain localization and porphyroclast rotation AN - 857809897; 2011-028210 AB - It has been debated for decades whether rigid inclusions, such as porphyroclasts and porphyroblasts, do or do not rotate in a softer matrix during deformation. Experiments and numerical simulations with viscous matrix rheologies show ongoing rotation of circular inclusions, whereas using Mohr-Coulomb plasticity results in nonrotation. Because the rocks in which inclusions are found normally undergo deformation by dislocation creep, we applied a full-field crystal plasticity approach to investigate the rotation behavior of rigid circular inclusions. We show that the inclusion's rotation strongly depends on the anisotropy of the matrix minerals. Strongly anisotropic minerals will develop shear bands that reduce the rotation of inclusions. Inhibition of rotation can only occur after a significant amount of strain. Our results may help to explain why geologic rigid objects often show evidence for rotation, but not necessarily in accordance with the viscous theory that is usually applied to these systems. JF - Geology (Boulder) AU - Griera, Albert AU - Bons, Paul D AU - Jessell, Mark W AU - Lebensohn, Ricardo A AU - Evans, Lynn AU - Gomez-Rivas, Enrique Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 275 EP - 278 PB - Geological Society of America (GSA), Boulder, CO VL - 39 IS - 3 SN - 0091-7613, 0091-7613 KW - porphyroclastic texture KW - numerical models KW - strain KW - textures KW - structural analysis KW - data processing KW - plastic deformation KW - deformation KW - two-dimensional models KW - preferred orientation KW - ultrastructure KW - kinematics KW - rigidity KW - grain boundaries KW - rotation KW - inclusions KW - digital simulation KW - dislocation creep KW - plasticity KW - anisotropy KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/857809897?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geology+%28Boulder%29&rft.atitle=Strain+localization+and+porphyroclast+rotation&rft.au=Griera%2C+Albert%3BBons%2C+Paul+D%3BJessell%2C+Mark+W%3BLebensohn%2C+Ricardo+A%3BEvans%2C+Lynn%3BGomez-Rivas%2C+Enrique&rft.aulast=Griera&rft.aufirst=Albert&rft.date=2011-03-01&rft.volume=39&rft.issue=3&rft.spage=275&rft.isbn=&rft.btitle=&rft.title=Geology+%28Boulder%29&rft.issn=00917613&rft_id=info:doi/10.1130%2FG31549.1 L2 - http://www.gsajournals.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2011-01-01 N1 - Number of references - 36 N1 - PubXState - CO N1 - Document feature - illus. N1 - Last updated - 2012-06-07 N1 - CODEN - GLGYBA N1 - SubjectsTermNotLitGenreText - anisotropy; data processing; deformation; digital simulation; dislocation creep; grain boundaries; inclusions; kinematics; numerical models; plastic deformation; plasticity; porphyroclastic texture; preferred orientation; rigidity; rotation; strain; structural analysis; textures; two-dimensional models; ultrastructure DO - http://dx.doi.org/10.1130/G31549.1 ER - TY - JOUR T1 - Deep permeable fault-controlled helium transport and limited mantle flux in two extensional geothermal systems in the Great Basin, United States AN - 857809845; 2011-028190 AB - This study assesses the relative importance of deeply circulating meteoric water and direct mantle fluid inputs on near-surface (super 3) He/ (super 4) He anomalies reported at the Coso and Beowawe geothermal fields of the western United States. The depth of meteoric fluid circulation is a critical factor that controls the temperature, extent of fluid-rock isotope exchange, and mixing with deeply sourced fluids containing mantle volatiles. The influence of mantle fluid flux on the reported helium anomalies appears to be negligible in both systems. This study illustrates the importance of deeply penetrating permeable fault zones (10 (super -12) to 10 (super -15) m (super 2) ) in focusing groundwater and mantle volatiles with high (super 3) He/ (super 4) He ratios to shallow crustal levels. These continental geothermal systems are driven by free convection. JF - Geology (Boulder) AU - Banerjee, Amlan AU - Person, Mark AU - Hofstra, Albert H AU - Sweetkind, Donald S AU - Cohen, Denis AU - Sabin, Andrew AU - Unruh, Jeff AU - Zyvoloski, George AU - Gable, Carl W AU - Crossey, Laura J AU - Karlstrom, Karl Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 195 EP - 198 PB - Geological Society of America (GSA), Boulder, CO VL - 39 IS - 3 SN - 0091-7613, 0091-7613 KW - United States KW - Basin and Range Province KW - isotopes KW - mantle KW - fluid dynamics KW - stable isotopes KW - ground water KW - California KW - Inyo County California KW - transport KW - noble gases KW - helium KW - geochemistry KW - Nevada KW - faults KW - North America KW - rift zones KW - isotope ratios KW - Great Basin KW - Coso Hot Springs KGRA KW - structural controls KW - convection KW - Eureka County Nevada KW - basin range structure KW - geothermal energy KW - extension KW - geothermal fields KW - volatiles KW - Beowawe Field KW - He-4/He-3 KW - permeability KW - 29A:Economic geology, geology of energy sources KW - 16:Structural geology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/857809845?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geology+%28Boulder%29&rft.atitle=Deep+permeable+fault-controlled+helium+transport+and+limited+mantle+flux+in+two+extensional+geothermal+systems+in+the+Great+Basin%2C+United+States&rft.au=Banerjee%2C+Amlan%3BPerson%2C+Mark%3BHofstra%2C+Albert+H%3BSweetkind%2C+Donald+S%3BCohen%2C+Denis%3BSabin%2C+Andrew%3BUnruh%2C+Jeff%3BZyvoloski%2C+George%3BGable%2C+Carl+W%3BCrossey%2C+Laura+J%3BKarlstrom%2C+Karl&rft.aulast=Banerjee&rft.aufirst=Amlan&rft.date=2011-03-01&rft.volume=39&rft.issue=3&rft.spage=195&rft.isbn=&rft.btitle=&rft.title=Geology+%28Boulder%29&rft.issn=00917613&rft_id=info:doi/10.1130%2FG31557.1 L2 - http://www.gsajournals.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2011-01-01 N1 - Number of references - 21 N1 - PubXState - CO N1 - Document feature - illus. incl. sects., geol. sketch map N1 - SuppNotes - With GSA Data Repository Item 2011081 N1 - Last updated - 2012-06-07 N1 - CODEN - GLGYBA N1 - SubjectsTermNotLitGenreText - Basin and Range Province; basin range structure; Beowawe Field; California; convection; Coso Hot Springs KGRA; Eureka County Nevada; extension; faults; fluid dynamics; geochemistry; geothermal energy; geothermal fields; Great Basin; ground water; He-4/He-3; helium; Inyo County California; isotope ratios; isotopes; mantle; Nevada; noble gases; North America; permeability; rift zones; stable isotopes; structural controls; transport; United States; volatiles DO - http://dx.doi.org/10.1130/G31557.1 ER - TY - JOUR T1 - Reversible swelling of the cell wall of poplar biomass by ionic liquid at room temperature AN - 1777170518; 14416277 AB - Time-resolved autofluorescence, Raman microspectroscopy, and scanning microprobe X-ray diffraction were combined in order to characterize lignocellulosic biomass from poplar trees and how it changes during treatment with the ionic liquid 1-n-ethyl-3-methylimidazolium acetate (EMIMAC) at room temperature. The EMIMAC penetrates the cell wall from the lumen, swelling the cell wall by about a factor of two towards the empty lumen. However, the middle lamella remains unchanged, preventing the cell wall from swelling outwards. During this swelling, most of the cellulose microfibrils are solubilized but chain migration is restricted and a small percentage of microfibrils persist. When the EMIMAC is expelled, the cellulose recrystallizes as microfibrils of cellulose I. There is little change in the relative chemical composition of the cell wall after treatment. The action of EMIMAC on the poplar cell wall at room temperature would therefore appear to be a reversible swelling and a reversible decrystallization of the cell wall. JF - Bioresource Technology AU - Lucas, Marcel AU - Wagner, Greg L AU - Nishiyama, Yoshiharu AU - Hanson, Leif AU - Samayam, Indira P AU - Schall, Constance A AU - Langan, Paul AU - Rector, Kirk D AD - Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Y1 - 2011/03// PY - 2011 DA - March 2011 SP - 4518 EP - 4523 PB - Elsevier Science, The Boulevard Kidlington Oxford OX5 1GB UK VL - 102 IS - 6 SN - 0960-8524, 0960-8524 KW - Mechanical & Transportation Engineering Abstracts (MT); Environmental Engineering Abstracts (EN); CSA / ASCE Civil Engineering Abstracts (CE) KW - Pretreatment KW - Lignocellulosic biomass KW - Cellulose KW - Wood KW - Ionic liquid KW - Poplar KW - Walls KW - Lumens KW - Ionic liquids KW - Swelling KW - Biomass KW - Migration UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1777170518?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bioresource+Technology&rft.atitle=Reversible+swelling+of+the+cell+wall+of+poplar+biomass+by+ionic+liquid+at+room+temperature&rft.au=Lucas%2C+Marcel%3BWagner%2C+Greg+L%3BNishiyama%2C+Yoshiharu%3BHanson%2C+Leif%3BSamayam%2C+Indira+P%3BSchall%2C+Constance+A%3BLangan%2C+Paul%3BRector%2C+Kirk+D&rft.aulast=Lucas&rft.aufirst=Marcel&rft.date=2011-03-01&rft.volume=102&rft.issue=6&rft.spage=4518&rft.isbn=&rft.btitle=&rft.title=Bioresource+Technology&rft.issn=09608524&rft_id=info:doi/10.1016%2Fj.biortech.2010.12.087 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-05-01 N1 - Last updated - 2016-05-18 DO - http://dx.doi.org/10.1016/j.biortech.2010.12.087 ER - TY - JOUR T1 - Stochastic simulation of uranium migration at the Hanford 300 Area AN - 1676579799; 2015-036608 AB - This work focuses on the quantification of groundwater flow and subsequent U(VI) transport uncertainty due to heterogeneity in the sediment permeability at the Hanford 300 Area. U(VI) migration at the site is simulated with multiple realizations of stochastically-generated high resolution permeability fields and comparisons are made of cumulative water and U(VI) flux to the Columbia River. The massively parallel reactive flow and transport code PFLOTRAN is employed utilizing 40,960 processor cores on DOE's petascale Jaguar supercomputer to simultaneously execute 10 transient, variably-saturated groundwater flow and U(VI) transport simulations within 3D heterogeneous permeability fields using the code's multi-realization simulation capability. Simulation results demonstrate that the cumulative U(VI) flux to the Columbia River is less responsive to fine scale heterogeneity in permeability and more sensitive to the distribution of permeability within the river hyporheic zone and mean permeability of larger-scale geologic structures at the site. Abstract Copyright (2011) Elsevier, B.V. JF - Journal of Contaminant Hydrology AU - Hammond, Glenn E AU - Lichtner, Peter C AU - Rockhold, Mark L Y1 - 2011/03/01/ PY - 2011 DA - 2011 Mar 01 SP - 115 EP - 128 PB - Elsevier, Amsterdam VL - 120-121 SN - 0169-7722, 0169-7722 KW - United States KW - contaminant plumes KW - simulation KW - remediation KW - radioactive waste KW - ground water KW - PFLOTRAN model KW - transport KW - stochastic processes KW - quantitative analysis KW - sediments KW - reactive transport KW - heterogeneity KW - uncertainty KW - migration KW - Washington KW - Columbia River KW - pollution KW - Hanford Site KW - fluid flow KW - metals KW - multiphase flow KW - uranium KW - actinides KW - permeability KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1676579799?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Contaminant+Hydrology&rft.atitle=Stochastic+simulation+of+uranium+migration+at+the+Hanford+300+Area&rft.au=Hammond%2C+Glenn+E%3BLichtner%2C+Peter+C%3BRockhold%2C+Mark+L&rft.aulast=Hammond&rft.aufirst=Glenn&rft.date=2011-03-01&rft.volume=120-121&rft.issue=&rft.spage=115&rft.isbn=&rft.btitle=&rft.title=Journal+of+Contaminant+Hydrology&rft.issn=01697722&rft_id=info:doi/10.1016%2Fj.jconhyd.2010.04.005 L2 - http://www.sciencedirect.com/science/journal/01697722 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2015-01-01 N1 - Number of references - 21 N1 - Document feature - illus. incl. 6 tables, sketch map N1 - Last updated - 2015-04-30 N1 - SubjectsTermNotLitGenreText - actinides; Columbia River; contaminant plumes; fluid flow; ground water; Hanford Site; heterogeneity; metals; migration; multiphase flow; permeability; PFLOTRAN model; pollution; quantitative analysis; radioactive waste; reactive transport; remediation; sediments; simulation; stochastic processes; transport; uncertainty; United States; uranium; Washington DO - http://dx.doi.org/10.1016/j.jconhyd.2010.04.005 ER - TY - JOUR T1 - Marine methane cycle simulations for the period of early global warming AN - 1654664573; 21218208 AB - Geochemical environments, fates, and effects are modeled for methane released into seawater by the decomposition of climate-sensitive clathrates. A contemporary global background cycle is first constructed, within the framework of the Parallel Ocean Program. Input from organics in the upper thermocline is related to oxygen levels, and microbial consumption is parameterized from available rate measurements. Seepage into bottom layers is then superimposed, representing typical seabed fluid flow. The resulting CH sub(4) distribution is validated against surface saturation ratios, vertical sections, and slope plume studies. Injections of clathrate-derived methane are explored by distributing a small number of point sources around the Arctic continental shelf, where stocks are extensive and susceptible to instability during the first few decades of global warming. Isolated bottom cells are assigned dissolved gas fluxes from porous-media simulation. Given the present bulk removal pattern, methane does not penetrate far from emission sites. Accumulated effects, however, spread to the regional scale following the modeled current system. Both hypoxification and acidification are documented. Sensitivity studies illustrate a potential for material restrictions to broaden the perturbations, since methanotrophic consumers require nutrients and trace metals. When such factors are considered, methane buildup within the Arctic basin is enhanced. However, freshened polar surface waters act as a barrier to atmospheric transfer, diverting products into the deep return flow. Uncertainties in the logic and calculations are enumerated including those inherent in high-latitude clathrate abundance, buoyant effluent rise through the column, representation of the general circulation, and bacterial growth kinetics. JF - Journal of Geophysical Research: Biogeosciences AU - Elliott, Scott AU - Maltrud, Mathew AU - Reagan, Matthew AU - Moridis, George AU - Cameron-Smith, Philip AD - Climate Ocean Sea Ice Modeling, Los Alamos National Laboratory, Los Alamos, New Mexico, USA. Y1 - 2011/03// PY - 2011 DA - Mar 2011 SP - [np] VL - 116 IS - G1 SN - 0148-0227, 0148-0227 KW - Sustainability Science Abstracts KW - Methane KW - Surface water KW - Geochemistry KW - Climatic changes KW - Basins KW - Simulation KW - Greenhouse effect KW - Polar environments KW - PN, Arctic Basin KW - PN, Arctic KW - Currents KW - Oceans KW - Kinetics KW - Global warming KW - Acidification KW - Thermocline KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1654664573?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research%3A+Biogeosciences&rft.atitle=Marine+methane+cycle+simulations+for+the+period+of+early+global+warming&rft.au=Elliott%2C+Scott%3BMaltrud%2C+Mathew%3BReagan%2C+Matthew%3BMoridis%2C+George%3BCameron-Smith%2C+Philip&rft.aulast=Elliott&rft.aufirst=Scott&rft.date=2011-03-01&rft.volume=116&rft.issue=G1&rft.spage=%5Bnp%5D&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research%3A+Biogeosciences&rft.issn=01480227&rft_id=info:doi/10.1029%2F2010JG001300 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-02-01 N1 - Last updated - 2015-02-18 N1 - SubjectsTermNotLitGenreText - Methane; Surface water; Climatic changes; Geochemistry; Simulation; Basins; Greenhouse effect; Polar environments; Currents; Kinetics; Oceans; Global warming; Acidification; Thermocline; PN, Arctic; PN, Arctic Basin DO - http://dx.doi.org/10.1029/2010JG001300 ER - TY - CPAPER T1 - Superconducting for Magnets T2 - 2011 Annual Meeting of the American Association for the Advancement of Science (AAAS 2011) AN - 1312986052; 6045165 JF - 2011 Annual Meeting of the American Association for the Advancement of Science (AAAS 2011) AU - Larbalestier, David Y1 - 2011/02/17/ PY - 2011 DA - 2011 Feb 17 KW - Magnets UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312986052?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2011+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2011%29&rft.atitle=Superconducting+for+Magnets&rft.au=Larbalestier%2C+David&rft.aulast=Larbalestier&rft.aufirst=David&rft.date=2011-02-17&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2011+Annual+Meeting+of+the+American+Association+for+the+Advancement+of+Science+%28AAAS+2011%29&rft.issn=&rft_id=info:doi/ L2 - http://aaas.confex.com/aaas/2011/webprogram/start.html#srch=method|and|pge|1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Breakdown of volume scaling in Auger recombination in CdSe/CdS heteronanocrystals: the role of the core-shell interface. AN - 856774123; 21207930 AB - Spatial confinement of electronic excitations in semiconductor nanocrystals (NCs) results in a significant enhancement of nonradiative Auger recombination (AR), such that AR processes can easily dominate the decay of multiexcitons. AR is especially detrimental to lasing applications of NCs, as optical gain in these structures explicitly relies on emission from multiexciton states. In standard NCs, AR rates scale linearly with inverse NC volume. Here, we investigate multiexciton dynamics in hetero-NCs composed of CdSe cores and CdS shells of tunable thickness. We observe a dramatic decrease in the AR rates at the initial stage of shell growth, which cannot be explained by traditional volume scaling alone. Rather, fluorescence-line-narrowing studies indicate that the suppression of AR correlates with the formation of an alloy layer at the core-shell interface suggesting that this effect derives primarily from the "smoothing" of the confinement potential associated with interfacial alloying. These data highlight the importance of NC interfacial structure in the AR process and provide general guidelines for the development of new nanostructures with suppressed AR for future lasing applications. JF - Nano letters AU - García-Santamaría, Florencio AU - Brovelli, Sergio AU - Viswanatha, Ranjani AU - Hollingsworth, Jennifer A AU - Htoon, Han AU - Crooker, Scott A AU - Klimov, Victor I AD - Center for Advanced Solar Photophysics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. Y1 - 2011/02/09/ PY - 2011 DA - 2011 Feb 09 SP - 687 EP - 693 VL - 11 IS - 2 KW - Cadmium Compounds KW - 0 KW - Selenium Compounds KW - Sulfides KW - cadmium sulfide KW - 057EZR4Z7Q KW - cadmium selenide KW - A7F646JC5C KW - Index Medicus KW - Equipment Design KW - Equipment Failure Analysis KW - Particle Size KW - Porosity KW - Crystallization -- methods KW - Nanostructures -- ultrastructure KW - Quantum Dots KW - Nanostructures -- chemistry KW - Nanotechnology -- instrumentation KW - Sulfides -- chemistry KW - Semiconductors KW - Selenium Compounds -- chemistry KW - Cadmium Compounds -- chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/856774123?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nano+letters&rft.atitle=Breakdown+of+volume+scaling+in+Auger+recombination+in+CdSe%2FCdS+heteronanocrystals%3A+the+role+of+the+core-shell+interface.&rft.au=Garc%C3%ADa-Santamar%C3%ADa%2C+Florencio%3BBrovelli%2C+Sergio%3BViswanatha%2C+Ranjani%3BHollingsworth%2C+Jennifer+A%3BHtoon%2C+Han%3BCrooker%2C+Scott+A%3BKlimov%2C+Victor+I&rft.aulast=Garc%C3%ADa-Santamar%C3%ADa&rft.aufirst=Florencio&rft.date=2011-02-09&rft.volume=11&rft.issue=2&rft.spage=687&rft.isbn=&rft.btitle=&rft.title=Nano+letters&rft.issn=1530-6992&rft_id=info:doi/10.1021%2Fnl103801e LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2011-05-19 N1 - Date created - 2011-02-09 N1 - Date revised - 2017-02-17 N1 - Last updated - 2017-02-22 DO - http://dx.doi.org/10.1021/nl103801e ER - TY - JOUR T1 - Surface Mass Balance and Runoff Modeling Using HIRHAM4 RCM at Kangerlussuaq (Sandre Stramfjord), West Greenland, 1950-2080 AN - 869578946; 14781614 AB - A regional atmospheric model, the HIRHAM4 regional climate model (RCM) using boundary conditions from the ECHAM5 atmosphereaocean general circulation model (AOGCM), was downscaled to a 500-m gridcell increment using SnowModel to simulate 131 yr (1950-2080) of hydrologic cycle evolution in west Greenlandas Kangerlussuaq drainage. Projected changes in the Greenland Ice Sheet (GrIS) surface mass balance (SMB) and runoff are relevant for potential hydropower production and prediction of ecosystem changes in sensitive Kangerlussuaq Fjord systems. Mean annual surface air temperatures and precipitation in the Kangerlussuaq area were simulated to increase by 3.4 degree C and 95 mm water equivalent (w.eq.), respectively, between 1950 and 2080. The local Kangerlussuaq warming was less than the average warming of 4.8 degree C simulated for the entire GrIS. The Kangerlussuaq SMB loss increased by an average of 0.3 km super(3) because of - 0.4 km super(3) rise in precipitation, 0.1 km super(3) rise in evaporation and sublimation, and 0.6 km super(3) gain in runoff (1950-2080). By 2080, the spring runoff season begins approximately three weeks earlier. The average modeled SMB and runoff is approximately a0.1 and 1.2 km super(3) yr super(a1), respectively, indicating that 10% of the Kangerlussuaq runoff is explained by the GrIS SMB net loss. The cumulative net volume loss (1950-2080) from SMB was 15.9 km super(3), and runoff was 151.2 km super(3) w.eq. This runoff volume is expected to have important hydrodynamic and ecological impacts on the stratified salinity in the Kangerlussuaq Fjord and on the transport of freshwater to the ocean. JF - Journal of Climate AU - Mernild, Sebastian H AU - Liston, Glen E AU - Hiemstra, Christopher A AU - Christensen, Jens H AU - Stendel, Martin AU - Hasholt, Bent AD - Climate, Ocean and Sea Ice Modeling Group, Computational Physics and Methods, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, mernild@lanl.gov Y1 - 2011/02// PY - 2011 DA - Feb 2011 SP - 609 EP - 623 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 USA VL - 24 IS - 3 SN - 0894-8755, 0894-8755 KW - Oceanic Abstracts; Meteorological & Geoastrophysical Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality KW - Marine KW - PN, Greenland, Greenland Ice Sheet KW - Rainfall runoff KW - Evaporation KW - Drainage KW - Greenland ice sheet KW - Ocean circulation KW - Atmospheric circulation KW - Precipitation KW - Hydrologic cycle KW - Air temperature KW - Volume transport KW - General circulation models KW - ANE, Greenland, Oestgroenland, Kong Christian IX Land, Kangerlussuaq Fjord KW - Ocean-atmosphere system KW - Glaciation KW - Rainfall-runoff modeling KW - Seasonal variability KW - Sublimation KW - Runoff KW - AN, Greenland KW - M2 551.324:Land Ice/Glaciers (551.324) KW - Q5 08503:Characteristics, behavior and fate KW - O 1080:Multi-disciplinary Studies UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/869578946?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aasfaaquaticpollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Climate&rft.atitle=Surface+Mass+Balance+and+Runoff+Modeling+Using+HIRHAM4+RCM+at+Kangerlussuaq+%28Sandre+Stramfjord%29%2C+West+Greenland%2C+1950-2080&rft.au=Mernild%2C+Sebastian+H%3BListon%2C+Glen+E%3BHiemstra%2C+Christopher+A%3BChristensen%2C+Jens+H%3BStendel%2C+Martin%3BHasholt%2C+Bent&rft.aulast=Mernild&rft.aufirst=Sebastian&rft.date=2011-02-01&rft.volume=24&rft.issue=3&rft.spage=609&rft.isbn=&rft.btitle=&rft.title=Journal+of+Climate&rft.issn=08948755&rft_id=info:doi/10.1175%2F2010JCLI3560.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-05-01 N1 - Number of references - 69 N1 - Last updated - 2014-05-02 N1 - SubjectsTermNotLitGenreText - Glaciation; Ocean-atmosphere system; Ocean circulation; Atmospheric circulation; Sublimation; Hydrologic cycle; Volume transport; Air temperature; Runoff; Evaporation; Rainfall runoff; Drainage; General circulation models; Greenland ice sheet; Rainfall-runoff modeling; Seasonal variability; Precipitation; PN, Greenland, Greenland Ice Sheet; ANE, Greenland, Oestgroenland, Kong Christian IX Land, Kangerlussuaq Fjord; AN, Greenland; Marine DO - http://dx.doi.org/10.1175/2010JCLI3560.1 ER - TY - JOUR T1 - Preliminary joint X-ray and neutron protein crystallographic studies of endoxylanase II from the fungus Trichoderma longibrachiatum AN - 864401641; 14373981 AB - Room-temperature X-ray and neutron diffraction data were measured from a family 11 endoxylanase holoenzyme (XynII) originating from the filamentous fungus Trichoderma longibrachiatum to 1.55Aa resolution using a home source and to 1.80Aa resolution using the Protein Crystallography Station at LANSCE. Crystals of XynII, which is an important enzyme for biofuel production, were grown at pH 8.5 in order to examine the effect of basic conditions on the protonation-state distribution in the active site and throughout the protein molecule and to provide insights for rational engineering of catalytically improved XynII for industrial applications. JF - Acta Crystallographica Section F AU - Kovalevsky, Andrey Y AU - Hanson, BLeif AU - Seaver, Sean AU - Fisher, SZoee AU - Mustyakimov, Marat AU - Langan, Paul AD - Bioscience Division, MS M888, Los Alamos National Laboratory, Los Alamos, NM 87545, USA Y1 - 2011/02/01/ PY - 2011 DA - 2011 Feb 01 SP - 283 EP - 286 PB - Wiley-Blackwell, 111 River Street Hoboken NJ 07030-5774 USA VL - 67 IS - 2 SN - 1744-3091, 1744-3091 KW - Microbiology Abstracts A: Industrial & Applied Microbiology; Microbiology Abstracts C: Algology, Mycology & Protozoology KW - Data processing KW - Enzymes KW - Crystals KW - Joints KW - Neutrons KW - Industrial applications KW - Ionizing radiation KW - Neutron diffraction KW - Trichoderma longibrachiatum KW - Crystallography KW - pH effects KW - Biofuels KW - K 03330:Biochemistry KW - A 01450:Environmental Pollution & Waste Treatment UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/864401641?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Amicrobiologya&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Acta+Crystallographica+Section+F&rft.atitle=Preliminary+joint+X-ray+and+neutron+protein+crystallographic+studies+of+endoxylanase+II+from+the+fungus+Trichoderma+longibrachiatum&rft.au=Kovalevsky%2C+Andrey+Y%3BHanson%2C+BLeif%3BSeaver%2C+Sean%3BFisher%2C+SZoee%3BMustyakimov%2C+Marat%3BLangan%2C+Paul&rft.aulast=Kovalevsky&rft.aufirst=Andrey&rft.date=2011-02-01&rft.volume=67&rft.issue=2&rft.spage=283&rft.isbn=&rft.btitle=&rft.title=Acta+Crystallographica+Section+F&rft.issn=17443091&rft_id=info:doi/10.1107%2FS174430911005075X LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-10-01 N1 - Document feature - figure 0 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Neutrons; Data processing; Industrial applications; Ionizing radiation; Neutron diffraction; Crystallography; Enzymes; Crystals; pH effects; Biofuels; Joints; Trichoderma longibrachiatum DO - http://dx.doi.org/10.1107/S174430911005075X ER - TY - JOUR T1 - Extended megadroughts in the southwestern United States during Pleistocene interglacials AN - 857809498; 2011-029974 JF - Nature (London) AU - Fawcett, Peter J AU - Werne, Josef P AU - Anderson, R Scott AU - Helkoop, Jeffrey M AU - Brown, Erik T AU - Berke, Melissa A AU - Smith, Susan J AU - Goff, Fraser AU - Donohoo-Hurley, Linda AU - Cisneros-Dozal, Luz M AU - Schouten, Stefan AU - Sinninghe Damste, Jaap S AU - Huang, Yongsong AU - Toney, Jaime AU - Fessenden, Julianna AU - WoldeGabriel, Giday AU - Atudorei, Viorel AU - Geissman, John W AU - Allen, Craig D Y1 - 2011/02// PY - 2011 DA - February 2011 SP - 518 EP - 521 PB - Macmillan Journals, London VL - 470 IS - 7335 SN - 0028-0836, 0028-0836 KW - United States KW - terrestrial environment KW - MIS 13 KW - isotopes KW - MIS 11 KW - New Mexico KW - paleoclimatology KW - stable isotopes KW - climate change KW - paleoecology KW - drought KW - Cenozoic KW - pollen KW - paleotemperature KW - carbon KW - Valles Caldera KW - sediments KW - miospores KW - Quaternary KW - interglacial environment KW - biostratigraphy KW - isotope ratios KW - C-13/C-12 KW - Southwestern U.S. KW - palynomorphs KW - lacustrine environment KW - Pleistocene KW - reconstruction KW - Colorado KW - microfossils KW - lake sediments KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/857809498?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+%28London%29&rft.atitle=Extended+megadroughts+in+the+southwestern+United+States+during+Pleistocene+interglacials&rft.au=Fawcett%2C+Peter+J%3BWerne%2C+Josef+P%3BAnderson%2C+R+Scott%3BHelkoop%2C+Jeffrey+M%3BBrown%2C+Erik+T%3BBerke%2C+Melissa+A%3BSmith%2C+Susan+J%3BGoff%2C+Fraser%3BDonohoo-Hurley%2C+Linda%3BCisneros-Dozal%2C+Luz+M%3BSchouten%2C+Stefan%3BSinninghe+Damste%2C+Jaap+S%3BHuang%2C+Yongsong%3BToney%2C+Jaime%3BFessenden%2C+Julianna%3BWoldeGabriel%2C+Giday%3BAtudorei%2C+Viorel%3BGeissman%2C+John+W%3BAllen%2C+Craig+D&rft.aulast=Fawcett&rft.aufirst=Peter&rft.date=2011-02-01&rft.volume=470&rft.issue=7335&rft.spage=518&rft.isbn=&rft.btitle=&rft.title=Nature+%28London%29&rft.issn=00280836&rft_id=info:doi/10.1038%2Fnature09839 L2 - http://www.nature.com/nature/index.html LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2011-01-01 N1 - Number of references - 28 N1 - Document feature - illus. incl. sketch map N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-06-07 N1 - CODEN - NATUAS N1 - SubjectsTermNotLitGenreText - biostratigraphy; C-13/C-12; carbon; Cenozoic; climate change; Colorado; drought; interglacial environment; isotope ratios; isotopes; lacustrine environment; lake sediments; microfossils; miospores; MIS 11; MIS 13; New Mexico; paleoclimatology; paleoecology; paleotemperature; palynomorphs; Pleistocene; pollen; Quaternary; reconstruction; sediments; Southwestern U.S.; stable isotopes; terrestrial environment; United States; Valles Caldera DO - http://dx.doi.org/10.1038/nature09839 ER - TY - JOUR T1 - PROMPT RETROSPECTIVE AIR SAMPLE ANALYSIS--A COMPARISON OF GROSS-ALPHA, BETA-TO-ALPHA RATIO, AND ALPHA SPECTROSCOPY TECHNIQUES AN - 856780406; 14385099 AB - The long-standing problem related to prompt analyses in continuous air sampling or monitoring has been the well-known interference of the radon- and thoron-progeny co-deposited on the filtration media with any potential suspect radionuclides. The solutions to this problem have been quite diverse, and have included, for example, simple gross-alpha screening, the use of beta-to-alpha ratios, and/or the use of alpha spectral analyses. In the context of week-long retrospective continuous air sampling, this paper will explain, in detail, the technical basis for the use of the simple gross-alpha screening, beta-to-alpha ratio, and alpha spectrometry techniques and demonstrate the efficacy (or lack thereof) of these methods with simple examples. Although the most sensitive analysis technique for week-long retrospective continuous air samples is no doubt a long-lived count performed typically after at least a four-day decay period, when necessary, certain prompt and semi-prompt techniques discussed here can approach a sensitivity that is within about an order of magnitude of the long-lived count. JF - Health Physics AU - Justus, AL AD - Los Alamos National Laboratory, Los Alamos, NM 87545, USA, ajustus@lanl.gov Y1 - 2011/02// PY - 2011 DA - Feb 2011 SP - 191 EP - 200 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 100 IS - 2 SN - 0017-9078, 0017-9078 KW - Pollution Abstracts; Health & Safety Science Abstracts KW - Sensitivity KW - Filtration KW - Air sampling KW - Radioisotopes KW - Decay KW - Spectroscopy KW - Spectrometry KW - H 8000:Radiation Safety/Electrical Safety KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/856780406?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=PROMPT+RETROSPECTIVE+AIR+SAMPLE+ANALYSIS--A+COMPARISON+OF+GROSS-ALPHA%2C+BETA-TO-ALPHA+RATIO%2C+AND+ALPHA+SPECTROSCOPY+TECHNIQUES&rft.au=Justus%2C+AL&rft.aulast=Justus&rft.aufirst=AL&rft.date=2011-02-01&rft.volume=100&rft.issue=2&rft.spage=191&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/10.1097%2FHP.0b013e3181f10269 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-03-01 N1 - Last updated - 2014-04-17 N1 - SubjectsTermNotLitGenreText - Sensitivity; Filtration; Radioisotopes; Air sampling; Decay; Spectroscopy; Spectrometry DO - http://dx.doi.org/10.1097/HP.0b013e3181f10269 ER - TY - JOUR T1 - Effects of 2D random velocity heterogeneities in the mantle lid and Moho topography on P (sub n) geometric spreading AN - 855184381; 2011-026449 AB - P (sub n) -wave energy refracts through the uppermost mantle, with the first seismic wave arrival at distances of approximately 200 to approximately 1500 km from crustal sources. The P (sub n) phase provides important constraints on source type, location, and magnitude, but its propagation is complicated by frequency-dependent sensitivity to the Earth's sphericity and lithospheric velocity structure. Converging on an acceptable P (sub n) geometric spreading correction and specifying its uncertainties, a requirement for accurately determining frequency-dependent attenuation models for P (sub n) , depends on improved understanding of the behavior of P (sub n) geometric spreading for various heterogeneous models. We investigate the effects of radial mantle lid velocity gradients, mantle lid random volumetric velocity heterogeneities, and Moho topography on P (sub n) geometric spreading using reflectivity and two-dimensional (2D) finite-difference 1-Hz wave propagation calculations for elastic Earth models. Mantle lid velocity gradients systematically modify the frequency-dependent geometric spreading from that found for models with constant velocity but retain the same overall functional form. P (sub n) amplitudes are also sensitive to the presence of modest 2D random lateral velocity heterogeneities within the uppermost mantle, with geometric spreading approaching a power-law behavior as the root mean square strength of heterogeneity increases. 2D Moho topography introduces scatter into the amplitude of P (sub n) , but the overall behavior remains compatible with that for a laterally homogeneous model. Given the lack of knowledge of specific small-scale structure for any particular P (sub n) path, the preferred geometric spreading parameterization is the frequency-dependent model for a constant mantle lid velocity structure unless P (sub n) travel-time branch curvature can constrain the radial gradient in the mantle lid. JF - Bulletin of the Seismological Society of America AU - Avants, Megan AU - Lay, Thorne AU - Xie, Xiao-Bi AU - Yang, Xiaoning Y1 - 2011/02// PY - 2011 DA - February 2011 SP - 126 EP - 140 PB - Seismological Society of America, Berkeley, CA VL - 101 IS - 1 SN - 0037-1106, 0037-1106 KW - upper mantle KW - discriminant analysis KW - density KW - explosions KW - lithosphere KW - finite difference analysis KW - statistical analysis KW - mantle KW - elastic waves KW - effects KW - Mohorovicic discontinuity KW - two-dimensional models KW - geometry KW - attenuation KW - topography KW - velocity structure KW - traveltime KW - velocity KW - nuclear explosions KW - heterogeneity KW - earthquakes KW - crust KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/855184381?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+Seismological+Society+of+America&rft.atitle=Effects+of+2D+random+velocity+heterogeneities+in+the+mantle+lid+and+Moho+topography+on+P+%28sub+n%29+geometric+spreading&rft.au=Avants%2C+Megan%3BLay%2C+Thorne%3BXie%2C+Xiao-Bi%3BYang%2C+Xiaoning&rft.aulast=Avants&rft.aufirst=Megan&rft.date=2011-02-01&rft.volume=101&rft.issue=1&rft.spage=126&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+Seismological+Society+of+America&rft.issn=00371106&rft_id=info:doi/10.1785%2F0120100113 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Seismological Society of America | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2011-01-01 N1 - Number of references - 21 N1 - PubXState - CA N1 - Document feature - illus. N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - attenuation; crust; density; discriminant analysis; earthquakes; effects; elastic waves; explosions; finite difference analysis; geometry; heterogeneity; lithosphere; mantle; Mohorovicic discontinuity; nuclear explosions; statistical analysis; topography; traveltime; two-dimensional models; upper mantle; velocity; velocity structure DO - http://dx.doi.org/10.1785/0120100113 ER - TY - JOUR T1 - Acoustic Radiation Force on a Spherical Contrast Agent Shell Near a Vessel Porous Wall - Theory AN - 853487112; 14257924 AB - Contrast agent microshells (CAMSs) are under intensive investigation for their wide applications in biomedical imaging and drug delivery. In drug delivery applications, CAMSs are guided to the targeted site before fragmentation by high-intensity ultrasound waves leading to the drug release. Prediction of the acoustic radiation force used to nondestructively guide a CAMS to the suspected site is becoming increasingly important and gaining attention particularly because it increases the system efficiency. The goal of this work is to present a theoretical model for the time-averaged (static) acoustic radiation force experienced by a CAMS near a blood vessel wall. An exact solution for the scattering of normal incident plane acoustic waves on an air-filled elastic spherical shell immersed in a nonviscous fluid near a porous and nonrigid boundary is employed to evaluate the radiation force function (which is the radiation force per unit energy density per unit cross-sectional surface). A particular example is chosen to illustrate the behavior of the time-averaged (static) radiation force on an elastic polyethylene spherical shell near a porous wall, with particular emphasis on the relative thickness of the shell and the distance from its center to the wall. This proposed model allows obtaining a priori information on the static radiation force that may be used to advantage in related as drug delivery and contrast agent imaging. This study should assist in the development of improved models for the evaluation of the time-averaged acoustic radiation force on a cluster of CAMSs in viscous and heat-conducting fluids. (E-mail: mitrianl.gov) JF - Ultrasound in Medicine & Biology AU - Miri, Amir K AU - Mitri, Farid G Y1 - 2011/02// PY - 2011 DA - Feb 2011 SP - 301 EP - 311 PB - Elsevier Science, The Boulevard Kidlington Oxford OX5 1GB UK VL - 37 IS - 2 SN - 0301-5629, 0301-5629 KW - Biotechnology and Bioengineering Abstracts KW - Acoustics KW - Blood vessels KW - Boundaries KW - Contrast media KW - Drug delivery KW - Energy KW - Polyethylene KW - Radiation KW - Ultrasound KW - Waves KW - imaging KW - W 30915:Pharmaceuticals & Vaccines UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/853487112?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Ultrasound+in+Medicine+%26+Biology&rft.atitle=Acoustic+Radiation+Force+on+a+Spherical+Contrast+Agent+Shell+Near+a+Vessel+Porous+Wall+-+Theory&rft.au=Miri%2C+Amir+K%3BMitri%2C+Farid+G&rft.aulast=Miri&rft.aufirst=Amir&rft.date=2011-02-01&rft.volume=37&rft.issue=2&rft.spage=301&rft.isbn=&rft.btitle=&rft.title=Ultrasound+in+Medicine+%26+Biology&rft.issn=03015629&rft_id=info:doi/10.1016%2Fj.ultrasmedbio.2010.11.006 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-02-01 N1 - Last updated - 2012-05-18 N1 - SubjectsTermNotLitGenreText - Drug delivery; Blood vessels; Radiation; Acoustics; Energy; Polyethylene; Boundaries; Contrast media; Waves; Ultrasound; imaging DO - http://dx.doi.org/10.1016/j.ultrasmedbio.2010.11.006 ER - TY - JOUR T1 - Chronology of colluvial apron deposition within Canada del Buey, Pajarito Plateau, New Mexico AN - 1017953303; 2012-053597 JF - New Mexico Geology AU - Lepper, Kenneth AU - Crowell, Kelly AU - Wilson, Cathy Y1 - 2011/02// PY - 2011 DA - February 2011 SP - 3 EP - 8 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM VL - 33 IS - 1 SN - 0196-948X, 0196-948X KW - United States KW - soils KW - mesas KW - Quaternary KW - erosion KW - Pajarito Plateau KW - New Mexico KW - erosion features KW - Holocene KW - Canada del Buey KW - upper Pleistocene KW - Cenozoic KW - optically stimulated luminescence KW - sampling KW - deposition KW - age KW - Pleistocene KW - debris aprons KW - soil erosion KW - 24:Quaternary geology KW - 03:Geochronology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1017953303?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=New+Mexico+Geology&rft.atitle=Chronology+of+colluvial+apron+deposition+within+Canada+del+Buey%2C+Pajarito+Plateau%2C+New+Mexico&rft.au=Lepper%2C+Kenneth%3BCrowell%2C+Kelly%3BWilson%2C+Cathy&rft.aulast=Lepper&rft.aufirst=Kenneth&rft.date=2011-02-01&rft.volume=33&rft.issue=1&rft.spage=3&rft.isbn=&rft.btitle=&rft.title=New+Mexico+Geology&rft.issn=0196948X&rft_id=info:doi/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 32 N1 - PubXState - NM N1 - Document feature - illus. incl. 4 tables, geol. sketch maps N1 - Last updated - 2012-06-07 N1 - CODEN - NMGED2 N1 - SubjectsTermNotLitGenreText - age; Canada del Buey; Cenozoic; debris aprons; deposition; erosion; erosion features; Holocene; mesas; New Mexico; optically stimulated luminescence; Pajarito Plateau; Pleistocene; Quaternary; sampling; soil erosion; soils; United States; upper Pleistocene ER - TY - JOUR T1 - A novel method for incorporating fission gas elements into solids AN - 855715377; 14184085 AB - A novel method for the fabrication of test samples for fission gas behavior studies is described. We applied the technique of ion beam assisted deposition (IBAD) as a means to introduce Xe atoms into alumina (Al sub(2)O sub(3)) films. We then investigated the redistribution of Xe atoms and microstructural evolution induced by annealing. Transmission electron microscopy analysis revealed that the microstructure of our Al sub(2)O sub(3)-Xe IBAD films resemble characteristic microstructural features associated with fission gas accumulation in reactor-irradiated nuclear fuels. JF - Journal of Nuclear Materials AU - Usov, I O AU - Won, J AU - Devlin, D J AU - Jiang, Y-B AU - Valdez, JA AU - Sickafus, KE AD - Los Alamos National Laboratory, Mailstop K763, Los Alamos, NM 87545, USA, iusov@lanl.gov Y1 - 2011/01/15/ PY - 2011 DA - 2011 Jan 15 SP - 205 EP - 208 PB - Elsevier Science, P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 408 IS - 2 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Nuclear fuels KW - Radioactive materials KW - Microscopy KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/855715377?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=A+novel+method+for+incorporating+fission+gas+elements+into+solids&rft.au=Usov%2C+I+O%3BWon%2C+J%3BDevlin%2C+D+J%3BJiang%2C+Y-B%3BValdez%2C+JA%3BSickafus%2C+KE&rft.aulast=Usov&rft.aufirst=I&rft.date=2011-01-15&rft.volume=408&rft.issue=2&rft.spage=205&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2010.11.008 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-01-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Microscopy; Radioactive materials; Nuclear fuels DO - http://dx.doi.org/10.1016/j.jnucmat.2010.11.008 ER - TY - JOUR T1 - Surface segregation and adsorption effects of iron-technetium alloys from first-principles AN - 855713431; 14184081 AB - Surface properties of Tc-rich and Fe-rich portions of the Tc-Fe binary alloy phase diagram were computed in this work on the basis of density functional theory. Tc and Fe were found to have minimal degrees of mixing in the parent phases, consistent with the experimentally derived phase diagram. The influence of oxygen on surface phase stability was also studied, with no significant impact on surface segregation or degree of surface mixing. Oxygen adsorption was shown to change the ordering of surface facets in Tc, such that the pyramidal phase becomes lower in energy than the prismatic phase, even with low coverage of oxygen. No evidence for increased surface segregation upon oxidation was found for the solid-solution phases. A potential-pH surface Pourbaix diagram was derived for Tc and H, OH and O adsorbed sub-monolayers were shown to be precursors to oxide formation. While Tc and Fe have similar reactivities and properties in their parent phases, and hence, also in solid-solution, the properties of the intermetallic are expected to be significantly different due to the size-mismatch between the elements. JF - Journal of Nuclear Materials AU - Taylor, Christopher D AD - Materials Technology - Metallurgy, Materials Science Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States, cdtaylor@lanl.gov Y1 - 2011/01/15/ PY - 2011 DA - 2011 Jan 15 SP - 183 EP - 187 PB - Elsevier Science, P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 408 IS - 2 SN - 0022-3115, 0022-3115 KW - Environment Abstracts KW - Oxygen KW - Oxidation KW - Radioactive materials KW - Adsorption KW - Alloys KW - ENA 03:Energy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/855713431?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvabstractsmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Nuclear+Materials&rft.atitle=Surface+segregation+and+adsorption+effects+of+iron-technetium+alloys+from+first-principles&rft.au=Taylor%2C+Christopher+D&rft.aulast=Taylor&rft.aufirst=Christopher&rft.date=2011-01-15&rft.volume=408&rft.issue=2&rft.spage=183&rft.isbn=&rft.btitle=&rft.title=Journal+of+Nuclear+Materials&rft.issn=00223115&rft_id=info:doi/10.1016%2Fj.jnucmat.2010.11.032 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-03-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Oxygen; Radioactive materials; Oxidation; Adsorption; Alloys DO - http://dx.doi.org/10.1016/j.jnucmat.2010.11.032 ER - TY - JOUR T1 - Efficient stochastic estimation of the model resolution matrix diagonal and generalized cross-validation for large geophysical inverse problems AN - 959097552; 2012-035428 AB - In recent years, larger geophysical data sets and novel model parameterizations have dramatically increased both the data and model space dimensions of many inverse problems. Because of their relatively low computational expense, trade-off curve corner estimation for choosing regularized models and "checkerboard" tests for evaluating model resolution are commonly applied, despite their limitations. We present and demonstrate a low-cost method for accurately estimating the diagonal elements of the model resolution matrix and for implementing generalized cross-validation (GCV) for optimal regularization parameter selection. The ability to estimate the diagonal of the resolution matrix and GCV function thus facilitates the introduction of additional tools for diagonal resolution analysis and regularization evaluation, even for very large inverse problems, with storage and computational costs comparable to those required for obtaining model solutions. We demonstrate the method using a Tikhonov regularized teleseismic body wave velocity inversion example with approximately 260,000 model parameters, where we validate randomly selected R (sub m) diagonal elements against explicitly calculated values and compare GCV-estimated regularized model results to those obtained through traditional methods. JF - Journal of Geophysical Research AU - MacCarthy, J K AU - Borchers, B AU - Aster, R C Y1 - 2011 PY - 2011 DA - 2011 EP - Citation B10304 PB - American Geophysical Union, Washington, DC VL - 116 IS - B10 SN - 0148-0227, 0148-0227 KW - tomography KW - P-waves KW - high-resolution methods KW - body waves KW - global KW - geophysical methods KW - inverse problem KW - elastic waves KW - teleseismic signals KW - seismic methods KW - stochastic processes KW - seismic waves KW - seismic networks KW - accuracy KW - arrays KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/959097552?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Efficient+stochastic+estimation+of+the+model+resolution+matrix+diagonal+and+generalized+cross-validation+for+large+geophysical+inverse+problems&rft.au=MacCarthy%2C+J+K%3BBorchers%2C+B%3BAster%2C+R+C&rft.aulast=MacCarthy&rft.aufirst=J&rft.date=2011-01-01&rft.volume=116&rft.issue=B10&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JB008234 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 34 N1 - PubXState - DC N1 - Document feature - illus. incl. geol. sketch maps N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - accuracy; arrays; body waves; elastic waves; geophysical methods; global; high-resolution methods; inverse problem; P-waves; seismic methods; seismic networks; seismic waves; stochastic processes; teleseismic signals; tomography DO - http://dx.doi.org/10.1029/2011JB008234 ER - TY - JOUR T1 - A summary and evaluation of thermochronologic constraints on the exhumation history of the Colorado Plateau-Rocky Mountain region AN - 925705138; 2012-025947 JF - Open-File Report - U. S. Geological Survey AU - Kelley, Shari A AU - Karlstrom, Karl E AU - Stockli, Danny AU - McKeon, Ryan AU - Hoffman, Markella AU - Lee, John AU - Pederson, Joel AU - Garcia, Rebecca AU - Coblentz, David Y1 - 2011 PY - 2011 DA - 2011 SP - 160 EP - 167 PB - U. S. Geological Survey, Reston, VA SN - 0196-1497, 0196-1497 KW - United States KW - Uinta Basin KW - Gore Range KW - Mogollon Plateau KW - Grand Canyon KW - Cenozoic KW - (U-Th)/He KW - geochronology KW - dates KW - Western U.S. KW - absolute age KW - thermochronology KW - exhumation KW - tectonics KW - USGS KW - apatite KW - North America KW - Colorado Plateau KW - U. S. Rocky Mountains KW - phosphates KW - Sawatch Range KW - Laramide Orogeny KW - fission-track dating KW - Virgin Mountains KW - Arizona KW - Colorado KW - Rocky Mountains KW - 03:Geochronology KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/925705138?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open-File+Report+-+U.+S.+Geological+Survey&rft.atitle=A+summary+and+evaluation+of+thermochronologic+constraints+on+the+exhumation+history+of+the+Colorado+Plateau-Rocky+Mountain+region&rft.au=Kelley%2C+Shari+A%3BKarlstrom%2C+Karl+E%3BStockli%2C+Danny%3BMcKeon%2C+Ryan%3BHoffman%2C+Markella%3BLee%2C+John%3BPederson%2C+Joel%3BGarcia%2C+Rebecca%3BCoblentz%2C+David&rft.aulast=Kelley&rft.aufirst=Shari&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=160&rft.isbn=&rft.btitle=&rft.title=Open-File+Report+-+U.+S.+Geological+Survey&rft.issn=01961497&rft_id=info:doi/ L2 - http://pubs.usgs.gov/of/2011/1210/ https://pubs.er.usgs.gov/browse/usgs-publications/OFR LA - English DB - GeoRef N1 - Conference title - CRevolution 2; origin and evolution of the Colorado River system N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 22 N1 - PubXState - VA N1 - Document feature - illus. incl. sketch map N1 - SuppNotes - Accessed on Jan. 17, 2012 N1 - Last updated - 2016-09-16 N1 - CODEN - XGROAG N1 - SubjectsTermNotLitGenreText - (U-Th)/He; absolute age; apatite; Arizona; Cenozoic; Colorado; Colorado Plateau; dates; exhumation; fission-track dating; geochronology; Gore Range; Grand Canyon; Laramide Orogeny; Mogollon Plateau; North America; phosphates; Rocky Mountains; Sawatch Range; tectonics; thermochronology; U. S. Rocky Mountains; Uinta Basin; United States; USGS; Virgin Mountains; Western U.S. ER - TY - JOUR T1 - Evidence from the Colorado River system for surface uplift of the Colorado Rockies and western Colorado Plateau in the last 10 Ma driven by mantle flow and buoyancy AN - 925705128; 2012-025946 JF - Open-File Report - U. S. Geological Survey AU - Karlstrom, Karl E AU - Coblentz, David AU - Ouimet, William AU - Kirby, Eric AU - Van Wijk, J AU - Schmandt, B AU - Crossey, Laura AU - Crow, Ryan AU - Kelley, Shari A AU - Aslan, Andres AU - Darling, Andrew AU - Dueker, K AU - Aster, R AU - MacCarthy, J AU - Lazear, Gregory D Y1 - 2011 PY - 2011 DA - 2011 SP - 153 EP - 159 PB - U. S. Geological Survey, Reston, VA SN - 0196-1497, 0196-1497 KW - United States KW - North America KW - Colorado River basin KW - Colorado Plateau KW - uplifts KW - mantle KW - U. S. Rocky Mountains KW - continental crust KW - convection KW - buoyancy KW - Cenozoic KW - Tertiary KW - topography KW - Neogene KW - fluvial features KW - Colorado KW - USGS KW - Rocky Mountains KW - faults KW - crust KW - 18:Solid-earth geophysics KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/925705128?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open-File+Report+-+U.+S.+Geological+Survey&rft.atitle=Evidence+from+the+Colorado+River+system+for+surface+uplift+of+the+Colorado+Rockies+and+western+Colorado+Plateau+in+the+last+10+Ma+driven+by+mantle+flow+and+buoyancy&rft.au=Karlstrom%2C+Karl+E%3BCoblentz%2C+David%3BOuimet%2C+William%3BKirby%2C+Eric%3BVan+Wijk%2C+J%3BSchmandt%2C+B%3BCrossey%2C+Laura%3BCrow%2C+Ryan%3BKelley%2C+Shari+A%3BAslan%2C+Andres%3BDarling%2C+Andrew%3BDueker%2C+K%3BAster%2C+R%3BMacCarthy%2C+J%3BLazear%2C+Gregory+D&rft.aulast=Karlstrom&rft.aufirst=Karl&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=153&rft.isbn=&rft.btitle=&rft.title=Open-File+Report+-+U.+S.+Geological+Survey&rft.issn=01961497&rft_id=info:doi/ L2 - http://pubs.usgs.gov/of/2011/1210/ https://pubs.er.usgs.gov/browse/usgs-publications/OFR LA - English DB - GeoRef N1 - Conference title - CRevolution 2; origin and evolution of the Colorado River system N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 16 N1 - PubXState - VA N1 - Document feature - illus. incl. sketch maps N1 - SuppNotes - Accessed on Jan. 17, 2012 N1 - Last updated - 2016-10-25 N1 - CODEN - XGROAG N1 - SubjectsTermNotLitGenreText - buoyancy; Cenozoic; Colorado; Colorado Plateau; Colorado River basin; continental crust; convection; crust; faults; fluvial features; mantle; Neogene; North America; Rocky Mountains; Tertiary; topography; U. S. Rocky Mountains; United States; uplifts; USGS ER - TY - JOUR T1 - Travel Determinants and Multiscale Transferability of National Activity Patterns to Local Populations AN - 923209009; 16217696 AB - The ability to transfer national travel patterns to a local population is of interest for modeling either large areas that exceed the boundaries of a metropolitan planning organization or small regions with no available travel survey data. At the core of this research are questions about the connection between travel behavior and land use, urban form, and accessibility. To explore this relationship, the researchers selected a group of land use variables to define activity and travel patterns for individuals and households. The 2001 National Household Travel Survey (NHTS) participants were divided into categories consisting of a set of latent cluster models representing persons, travel, and land use. This set was compared with two sets of cluster models constructed for two local travel surveys. Mean statistical tests were compared to assess differences among socio-demographic groups residing in localities with similar land uses. The results showed that the NHTS and the local surveys shared mean population activity and travel characteristics. However, these similarities masked behavioral heterogeneity, which was seen when distributions of activity and travel behavior were examined. Therefore, data from a national household travel survey in combination with land use data cannot be used to model local population travel characteristics if the goal is to model the behavioral distributions and not just mean travel behavior characteristics. JF - Transportation Research Record AU - Henson, Kriste M AU - Goulias, Konstadinos G AD - Los Alamos National Laboratory, Decision Applications Division, P O Box 1663, MS F609, Los Alamos, NM 87545, kriste@Ianl.gov Y1 - 2011 PY - 2011 DA - 2011 SP - 35 EP - 43 PB - Transportation Research Board VL - 2 IS - 2231 SN - 0361-1981, 0361-1981 KW - Sustainability Science Abstracts KW - Travel KW - households KW - Transportation KW - Households KW - Land use KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/923209009?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Transportation+Research+Record&rft.atitle=Travel+Determinants+and+Multiscale+Transferability+of+National+Activity+Patterns+to+Local+Populations&rft.au=Henson%2C+Kriste+M%3BGoulias%2C+Konstadinos+G&rft.aulast=Henson&rft.aufirst=Kriste&rft.date=2011-01-01&rft.volume=2&rft.issue=2231&rft.spage=35&rft.isbn=&rft.btitle=&rft.title=Transportation+Research+Record&rft.issn=03611981&rft_id=info:doi/10.3141%2F2231-05 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-02-01 N1 - Number of references - 23 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Travel; households; Transportation; Households; Land use DO - http://dx.doi.org/10.3141/2231-05 ER - TY - JOUR T1 - The La Madera travertines, Rio Ojo Caliente, northern New Mexico; investigating the linked system of CO (sub 2) -rich springs and travertines as neotectonic and paleoclimate indicators AN - 921718274; 2012-024031 AB - The La Madera travertine and CO (sub 2) -rich spring system of northern New Mexico provides a linked data set to examine neotectonics and mantle-to-surface fluid interconnections in the area of intersection of the Rio Grande rift and Jemez lineament. Water chemistry modeling shows that most of the CO (sub 2) is endogenic (derived from deep geologic sources), with subordinate amounts from dissolution of carbonate and from organic sources. Spring waters are high in arsenic, salts, and metals that mix with and detract from water quality in the regional aquifers, potentially including the Buckman wells near Santa Fe. (super 3) He; (super 4) He data from CO (sub 2) -rich hot and cool springs have values ranging from 6.16 to 0.09 R (sub A) (77 to 1% mantle helium), with highest values in the Valles caldera, approaching MORB values (8 R (sub A) ). Mantle degassing is interpreted as a neotectonic signal of active upwelling of asthenospheric mantle beneath the Jemez low seismic velocity mantle anomaly. These CO (sub 2) vents align along the NE- and N-trending, tectonically active, extensional faults and fault jogs that parallel the Jemez lineament. The regional continuity and neotectonic activity along these structures suggest an active Embudo-Jemez transfer zone that extends through the Albuquerque, Espanola, and San Luis basins. Endogenic fluid flux along this zone takes place in fault systems and is driven by geothermal pressure gradients. Travertines are deposited by CO (sub 2) -rich waters that ascend along faults and hence they provide a record of past and ongoing mantle (super 3) He and CO (sub 2) degassing. U-series dating so far, with ages back to >500 ka, suggests an episodicity in deposition of large volumes of travertine that may reflect regional wet periods with high groundwater head. Abundant deposition in the 200-100 ka range may provide a local record of the transition from the penultimate glaciation (135 ka) to the ensuing interglacial (125 ka) that is documented globally by the transition from marine oxygen isotope stage 6 to oxygen isotope stage 5. U-series dates on travertine-cemented terraces also provide precise river incision rates that vary from 100-300 m/Ma indicating differential landscape evolution across the region influenced by both regional tectonism and climate change. JF - Guidebook - New Mexico Geological Society AU - Crossey, Laura J AU - Karlstrom, Karl E AU - Newell, Dennis L AU - Kooser, Ara AU - Tafoya, April A2 - Koning, Daniel J. A2 - Karlstrom, Karl E. A2 - Kelley, Shari A. A2 - Lueth, Virgil W. A2 - Aby, Scott B. Y1 - 2011 PY - 2011 DA - 2011 SP - 301 EP - 316 PB - New Mexico Geological Society, Socorro, NM VL - 62 SN - 0077-8567, 0077-8567 KW - United States KW - water quality KW - upwelling KW - Rio Arriba County New Mexico KW - glaciation KW - isotopes KW - seismic anomalies KW - mantle KW - New Mexico KW - erosion rates KW - terraces KW - paleoclimatology KW - stable isotopes KW - climate change KW - uranium disequilibrium KW - ground water KW - carbon dioxide KW - Rio Grande Rift KW - Cenozoic KW - sedimentary rocks KW - neotectonics KW - noble gases KW - springs KW - helium KW - tectonics KW - geochemistry KW - faults KW - North America KW - Quaternary KW - interglacial environment KW - isotope ratios KW - landform evolution KW - Rio Ojo Caliente KW - hydrochemistry KW - La Madera New Mexico KW - travertine KW - Pleistocene KW - Jemez Lineament KW - He-4/He-3 KW - carbonate rocks KW - 24:Quaternary geology KW - 06A:Sedimentary petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921718274?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Guidebook+-+New+Mexico+Geological+Society&rft.atitle=The+La+Madera+travertines%2C+Rio+Ojo+Caliente%2C+northern+New+Mexico%3B+investigating+the+linked+system+of+CO+%28sub+2%29+-rich+springs+and+travertines+as+neotectonic+and+paleoclimate+indicators&rft.au=Crossey%2C+Laura+J%3BKarlstrom%2C+Karl+E%3BNewell%2C+Dennis+L%3BKooser%2C+Ara%3BTafoya%2C+April&rft.aulast=Crossey&rft.aufirst=Laura&rft.date=2011-01-01&rft.volume=62&rft.issue=&rft.spage=301&rft.isbn=9781585460977&rft.btitle=&rft.title=Guidebook+-+New+Mexico+Geological+Society&rft.issn=00778567&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - 62nd annual field conference of the New Mexico Geological Society N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 61 N1 - PubXState - NM N1 - Document feature - illus. incl. 2 tables, geol. sketch maps N1 - Last updated - 2012-06-07 N1 - CODEN - NMGGA5 N1 - SubjectsTermNotLitGenreText - carbon dioxide; carbonate rocks; Cenozoic; climate change; erosion rates; faults; geochemistry; glaciation; ground water; He-4/He-3; helium; hydrochemistry; interglacial environment; isotope ratios; isotopes; Jemez Lineament; La Madera New Mexico; landform evolution; mantle; neotectonics; New Mexico; noble gases; North America; paleoclimatology; Pleistocene; Quaternary; Rio Arriba County New Mexico; Rio Grande Rift; Rio Ojo Caliente; sedimentary rocks; seismic anomalies; springs; stable isotopes; tectonics; terraces; travertine; United States; upwelling; uranium disequilibrium; water quality ER - TY - JOUR T1 - Terrace stratigraphy, ages, and incision rates along the Rio Ojo Caliente, north-central New Mexico AN - 921718270; 2012-024030 AB - We present new tephrochronologic and radiometric data that constrain the ages of terraces along the Rio Oja Caliente. Draining the southern Tusas Mountains, the Rio Ojo Caliente is a tributary of the Rio Chama in the northwestern Espanola Basin. The highest terrace, labeled Qtoc1, has a strath located 107-134 m above the modern river. Qtoc1 contains ash and pumice-lapilli tephra probably correlative to the Guaje Pumice Bed of the Otowi Member of the Bandelier Tuff (1.61-1.63 Ma), although correlation to the Tsankawi Pumice Bed of the Tshirege Member of the Bandelier Tuff (1.22-1.26 Ma) is permissible. The second highest terrace, labeled Qtoc2, is 95-103 in above the modern river and correlates to terraces along the Rio Chama that contain the Lava Creek B ash (640 ka). The strath of the most laterally extensive terrace lies 19-30 m above the modern river. Called the 20-40 m terrace (labeled Qtoc6 in this study), it is older than 103 ka and probably younger than 210 ka based on stratigraphic relations and three U-series ages of an adjacent travertine mound complex. Both the Qtoc6 terrace and the next higher terrace level (Qtoc5) are characterized by having two straths (erosional terrace bases) separated by 2-7 m. Quartzite-rich gravel that overlies these strath couplets is generally 3.6 m-thick. Overlying these basal gravels is a 10-18 m-thick sequence of alluvium with higher sand content and higher amounts of locally derived alluvium. This sedimentologic trend indicates that following incision of the river to a new base level and deposition of axial gravel, subsequent aggradation was heavily influenced by input of detritus derived from nearby hillslopes and lew order drainages; this locally derived alluvium was deposited as alluvial fans on the margins of the river valley. In the Holocene (present) interglacial, significant local erosion and aggradation has also occurred. Using this comparison, we agree with previous interpretations along the lower Rio Chama that locally derived, sand-dominated alluvium in the middle and upper parts of the terraces, best exposed in Qtoc6 and Qtoc5, were also deposited in interglacial climates or at the glacial interglacial transition, and that strath formation and deposition of the quartzite-rich, basal gravel occurred largely during glacial climates (possibly at the glacial/interglacial transition). We use this process-response model to infer a preferred age of 130-160 ka for the Qtoc6 terrace deposit and its lowest strath. Consideration of terrace ages and their relative heights indicates an increase in incision rates after 640 ka, consistent with earlier interpretations. JF - Guidebook - New Mexico Geological Society AU - Koning, Daniel J AU - Newell, Dennis L AU - Sarna-Wojcicki, Andrei AU - Dunbar, Nelia AU - Karlstrom, Karl E AU - Salem, Anthony AU - Crossey, Laura J A2 - Koning, Daniel J. A2 - Karlstrom, Karl E. A2 - Kelley, Shari A. A2 - Lueth, Virgil W. A2 - Aby, Scott B. Y1 - 2011 PY - 2011 DA - 2011 SP - 281 EP - 300 PB - New Mexico Geological Society, Socorro, NM VL - 62 SN - 0077-8567, 0077-8567 KW - United States KW - lithostratigraphy KW - volcanic rocks KW - glaciation KW - igneous rocks KW - Rio Chama KW - quartzites KW - New Mexico KW - erosion rates KW - terraces KW - paleoclimatology KW - climate change KW - uranium disequilibrium KW - Cenozoic KW - Tshirege Member KW - sedimentary rocks KW - Bandelier Tuff KW - Tsankawi Pumice Bed KW - dates KW - metamorphic rocks KW - glacial environment KW - age KW - absolute age KW - volcanic ash KW - Tusas Mountains KW - Espanola Basin KW - tephrochronology KW - Quaternary KW - interglacial environment KW - Rio Ojo Caliente KW - aggradation KW - rates KW - correlation KW - lapilli KW - pyroclastics KW - Guaje Pumice Bed KW - alluvial fans KW - pumice KW - travertine KW - Pleistocene KW - Otowi Member KW - carbonate rocks KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921718270?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Guidebook+-+New+Mexico+Geological+Society&rft.atitle=Terrace+stratigraphy%2C+ages%2C+and+incision+rates+along+the+Rio+Ojo+Caliente%2C+north-central+New+Mexico&rft.au=Koning%2C+Daniel+J%3BNewell%2C+Dennis+L%3BSarna-Wojcicki%2C+Andrei%3BDunbar%2C+Nelia%3BKarlstrom%2C+Karl+E%3BSalem%2C+Anthony%3BCrossey%2C+Laura+J&rft.aulast=Koning&rft.aufirst=Daniel&rft.date=2011-01-01&rft.volume=62&rft.issue=&rft.spage=281&rft.isbn=9781585460977&rft.btitle=&rft.title=Guidebook+-+New+Mexico+Geological+Society&rft.issn=00778567&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - 62nd annual field conference of the New Mexico Geological Society N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 79 N1 - PubXState - NM N1 - Document feature - illus. incl. 6 tables, geol. sketch maps N1 - Last updated - 2012-06-07 N1 - CODEN - NMGGA5 N1 - SubjectsTermNotLitGenreText - absolute age; age; aggradation; alluvial fans; Bandelier Tuff; carbonate rocks; Cenozoic; climate change; correlation; dates; erosion rates; Espanola Basin; glacial environment; glaciation; Guaje Pumice Bed; igneous rocks; interglacial environment; lapilli; lithostratigraphy; metamorphic rocks; New Mexico; Otowi Member; paleoclimatology; Pleistocene; pumice; pyroclastics; quartzites; Quaternary; rates; Rio Chama; Rio Ojo Caliente; sedimentary rocks; tephrochronology; terraces; travertine; Tsankawi Pumice Bed; Tshirege Member; Tusas Mountains; United States; uranium disequilibrium; volcanic ash; volcanic rocks ER - TY - JOUR T1 - Chimaja; spring-parsley of the desert AN - 921718093; 2012-024001 JF - Guidebook - New Mexico Geological Society AU - Sickafus, Kurt E A2 - Koning, Daniel J. A2 - Karlstrom, Karl E. A2 - Kelley, Shari A. A2 - Lueth, Virgil W. A2 - Aby, Scott B. Y1 - 2011 PY - 2011 DA - 2011 SP - 44 EP - 46 PB - New Mexico Geological Society, Socorro, NM VL - 62 SN - 0077-8567, 0077-8567 KW - United States KW - eolian features KW - Plantae KW - living taxa KW - ecology KW - San Juan Basin KW - New Mexico KW - vegetation KW - deserts KW - biota KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921718093?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Guidebook+-+New+Mexico+Geological+Society&rft.atitle=Chimaja%3B+spring-parsley+of+the+desert&rft.au=Sickafus%2C+Kurt+E&rft.aulast=Sickafus&rft.aufirst=Kurt&rft.date=2011-01-01&rft.volume=62&rft.issue=&rft.spage=44&rft.isbn=9781585460977&rft.btitle=&rft.title=Guidebook+-+New+Mexico+Geological+Society&rft.issn=00778567&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - 62nd annual field conference of the New Mexico Geological Society N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 11 N1 - PubXState - NM N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-06-07 N1 - CODEN - NMGGA5 N1 - SubjectsTermNotLitGenreText - biota; deserts; ecology; eolian features; living taxa; New Mexico; Plantae; San Juan Basin; United States; vegetation ER - TY - JOUR T1 - Brittle and ductile friction and the physics of tectonic tremor AN - 921716784; 2012-023611 AB - Observations of nonvolcanic tremor provide a unique window into the mechanisms of deformation and failure in the lower crust. At increasing depths, rock deformation gradually transitions from brittle, where earthquakes occur, to ductile, with tremor occurring in the transitional region. The physics of deformation in the transition region remain poorly constrained, limiting our basic understanding of tremor and its relation to earthquakes. We combine field and laboratory observations with a physical friction model comprised of brittle and ductile components, and use the model to provide constraints on the friction and stress state in the lower crust. A phase diagram is constructed that characterizes under what conditions all faulting behaviors occur, including earthquakes, tremor, silent transient slip, and steady sliding. Our results show that tremor occurs over a range of ductile and brittle frictional strengths, and advances our understanding of the physical conditions at which tremor and earthquakes take place. JF - Geophysical Research Letters AU - Daub, Eric G AU - Shelly, David R AU - Guyer, Robert A AU - Johnson, Paul A Y1 - 2011 PY - 2011 DA - 2011 EP - Citation L10301 PB - American Geophysical Union, Washington, DC VL - 38 IS - 10 SN - 0094-8276, 0094-8276 KW - friction KW - mechanical properties KW - brittle deformation KW - deformation KW - theoretical models KW - tectonics KW - seismic energy KW - lower crust KW - earthquakes KW - seismotectonics KW - faults KW - crust KW - ductile deformation KW - 19:Seismology KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921716784?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Brittle+and+ductile+friction+and+the+physics+of+tectonic+tremor&rft.au=Daub%2C+Eric+G%3BShelly%2C+David+R%3BGuyer%2C+Robert+A%3BJohnson%2C+Paul+A&rft.aulast=Daub&rft.aufirst=Eric&rft.date=2011-01-01&rft.volume=38&rft.issue=10&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2011GL046866 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 43 N1 - PubXState - DC N1 - Document feature - illus. N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-06-07 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - brittle deformation; crust; deformation; ductile deformation; earthquakes; faults; friction; lower crust; mechanical properties; seismic energy; seismotectonics; tectonics; theoretical models DO - http://dx.doi.org/10.1029/2011GL046866 ER - TY - JOUR T1 - Modeling the transport of passive tracers in sea ice AN - 921716599; 2012-021864 AB - A model for the vertical transport of passive tracers in sea ice is presented. Two Reynolds flux closure approximations are proposed for the tracer velocity dispersion term in the new ice tracer model (IceT). The schemes, "enhanced molecular diffusion" (EMD) and "mixing length diffusion" (MLD), are suggested parameterizations of gravity drainage, the dominant mechanism of desalination in growing sea ice. The performance of IceT using each parameterization is tested against two experimental studies: simulations I compare profiles of brine salinity with passive tracer concentrations during sea ice growth and melt, and simulations II compare bottom boundary salt and brine volume fluxes with passive tracer fluxes and bottom diffusivities. IceT behavior is evaluated under three salinity forcing prescriptions. Both schemes successfully reproduce expected tracer concentrations in simulations I when the salinity forcing evolves logarithmically. However in simulations II, the MLD scheme outperforms EMD in two significant ways: 1) growth rate trends in the MLD diffusivity parallel measurements of brine volume flux, while EMD bottom diffusivities remain almost constant; and 2) MLD bottom tracer concentrations decrease with ice growth rate similar to excluded brine salinity, while EMD trends are contrary. Hence, enhanced molecular diffusion is highly questionable for implementation in models of reactive passive tracers. The IceT mixing length diffusivity is a viable choice in sea ice biogeochemical modeling. It remains a challenge to assess whether MLD can provide quantitative estimates of desalination at each time step for use in forcing IceT or for implementation in a model of sea ice salinity. JF - Journal of Geophysical Research AU - Jeffery, Nicole AU - Hunke, E C AU - Elliott, Scott M Y1 - 2011 PY - 2011 DA - 2011 EP - Citation C07020 PB - American Geophysical Union, Washington, DC VL - 116 IS - C7 SN - 0148-0227, 0148-0227 KW - solid phase KW - models KW - liquid phase KW - transport KW - ice KW - Darcy's law KW - sea ice KW - brines KW - tracers KW - temperature KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921716599?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Modeling+the+transport+of+passive+tracers+in+sea+ice&rft.au=Jeffery%2C+Nicole%3BHunke%2C+E+C%3BElliott%2C+Scott+M&rft.aulast=Jeffery&rft.aufirst=Nicole&rft.date=2011-01-01&rft.volume=116&rft.issue=C7&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2010JC006527 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 25 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - brines; Darcy's law; ice; liquid phase; models; sea ice; solid phase; temperature; tracers; transport DO - http://dx.doi.org/10.1029/2010JC006527 ER - TY - JOUR T1 - Large-scale modeling of primary production and ice algal biomass within Arctic sea ice in 1992 AN - 921716468; 2012-021849 AB - An ice ecosystem model was coupled to a global dynamic sea ice model to assess large-scale variability of primary production and ice algal biomass within arctic sea ice. The component models are the Physical Ecosystem Model (PhEcoM) ice ecosystem model and the Los Alamos Sea Ice Model (CICE). Simulated annual arctic sea ice primary production was 15.1 Tg C; within the range of 9 to 73 Tg C estimated using in situ data. The amount of C fixed was >3 Tg C month (super -1) for March, April, and May. The Bering Sea, Arctic Ocean basins, and the Canadian Archipelago/Baffin Bay were the most productive regions on an annual basis, contributing approximately 24, 18, and another 18%, respectively. High production in the Bering Sea was due to high daily production rates, while the large sea ice coverage in the Canadian Archipelago/Baffin Bay and, in particular, the Arctic Ocean basins resulted in their considerable contribution to sea ice primary production. The simulated trends, patterns, and seasonality of ice algae agree reasonably well with very limited observations. In the model, ice growth rate controls the availability of nutrients to sea ice algae, such that ocean nutrient supply is of secondary importance to ice algal growth. The numerical model results suggest that ice melt rate, which determines the proportional rate of ice algal release, controls the termination of the bloom on large scales. The model described advances the role of sea ice algae in biogeochemical cycling within global climate models. JF - Journal of Geophysical Research AU - Deal, Clara AU - Jin, Meibing AU - Elliott, Scott M AU - Hunke, Elizabeth AU - Maltrud, Mathew AU - Jeffery, Nicole Y1 - 2011 PY - 2011 DA - 2011 EP - Citation C07004 PB - American Geophysical Union, Washington, DC VL - 116 IS - C7 SN - 0148-0227, 0148-0227 KW - Plantae KW - ice cover thickness KW - biomass KW - Arctic region KW - sea ice KW - ice cover KW - ecosystems KW - algae KW - models KW - ice KW - Arctic Ocean KW - ecology KW - productivity KW - ice cover distribution KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921716468?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Large-scale+modeling+of+primary+production+and+ice+algal+biomass+within+Arctic+sea+ice+in+1992&rft.au=Deal%2C+Clara%3BJin%2C+Meibing%3BElliott%2C+Scott+M%3BHunke%2C+Elizabeth%3BMaltrud%2C+Mathew%3BJeffery%2C+Nicole&rft.aulast=Deal&rft.aufirst=Clara&rft.date=2011-01-01&rft.volume=116&rft.issue=C7&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2010JC006409 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 33 N1 - PubXState - DC N1 - Document feature - illus. incl. sketch maps N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - algae; Arctic Ocean; Arctic region; biomass; ecology; ecosystems; ice; ice cover; ice cover distribution; ice cover thickness; models; Plantae; productivity; sea ice DO - http://dx.doi.org/10.1029/2010JC006409 ER - TY - JOUR T1 - Uranium deposits in the Espanola Basin, Santa Fe County, New Mexico AN - 921716237; 2012-024039 AB - Uranium mineralization in the Espanola Basin is not of sufficient quantity and quality to justify mining at the present time. However, many private water wells in the region produce water with concentrations of uranium (up to 1,820 mu g/L (ppb)) that exceed the safe drinking water standard of 30 mu g/L. Therefore, it is important to understand the source of the uranium in the groundwater and the processes involved. Potential sources for uranium in the groundwater include 1) uranium occurrences in the Tesuque Formation (San Jose mining district), 2) rhyolitic volcanic ash beds and sandstones with volcanic detritus found interbedded within the Tesuque Formation, 3) veins, replacements, and pegmatites in Proterozoic rocks (San Jose and Nambe mining districts), and 4) Proterozoic granitic rocks in the Sangre de Cristo Mountains. The sandstone uranium occurrences in the Fesuque Formation represent natural precipitation and concentration from uraniferous groundwaters, likely derived from 1) rhyolitic volcanic ash beds within the Tesuque Formation, 2) the alteration of granitic and/or volcanic detritus within the sedimentary host rocks, and 3) Proterozoic rocks in the Sangre de Cristo Mountains to the east. One property, the San Jose No. 13 (NMSF0033), produced 12 lbs (5 kg) of U (sub 3) O (sub 8) , at a grade of 0.05% U (sub 3) O (sub 8) in 1957. Uranium in modern groundwaters likely was derived from the same sources, as well as from leaching and oxidation of older uranium occurrences in the Tesuque Formation. Uranium then precipitated from the waters to form the geochemical anomalies found in the prospects. JF - Guidebook - New Mexico Geological Society AU - McLemore, Virginia T AU - Vaniman, David AU - McQuillan, Dennis AU - Longmire, Patrick A2 - Koning, Daniel J. A2 - Karlstrom, Karl E. A2 - Kelley, Shari A. A2 - Lueth, Virgil W. A2 - Aby, Scott B. Y1 - 2011 PY - 2011 DA - 2011 SP - 399 EP - 408 PB - New Mexico Geological Society, Socorro, NM VL - 62 SN - 0077-8567, 0077-8567 KW - United States KW - water quality KW - mining KW - volcanic rocks KW - upper Precambrian KW - X-ray diffraction data KW - igneous rocks KW - Sangre de Cristo Mountains KW - sandstone KW - New Mexico KW - drinking water KW - ground water KW - Cenozoic KW - sedimentary rocks KW - potential deposits KW - San Jose mining district KW - X-ray fluorescence spectra KW - Santa Fe County New Mexico KW - Tesuque Formation KW - spectra KW - volcanic ash KW - geochemistry KW - Espanola Basin KW - North America KW - rhyolites KW - Precambrian KW - U. S. Rocky Mountains KW - Proterozoic KW - hydrochemistry KW - Nambe mining district KW - pyroclastics KW - provenance KW - uranium ores KW - Tertiary KW - Neogene KW - metals KW - natural hazards KW - metal ores KW - uranium KW - leaching KW - water wells KW - clastic rocks KW - actinides KW - Rocky Mountains KW - 02B:Hydrochemistry KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921716237?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Guidebook+-+New+Mexico+Geological+Society&rft.atitle=Uranium+deposits+in+the+Espanola+Basin%2C+Santa+Fe+County%2C+New+Mexico&rft.au=McLemore%2C+Virginia+T%3BVaniman%2C+David%3BMcQuillan%2C+Dennis%3BLongmire%2C+Patrick&rft.aulast=McLemore&rft.aufirst=Virginia&rft.date=2011-01-01&rft.volume=62&rft.issue=&rft.spage=399&rft.isbn=9781585460977&rft.btitle=&rft.title=Guidebook+-+New+Mexico+Geological+Society&rft.issn=00778567&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - 62nd annual field conference of the New Mexico Geological Society N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 36 N1 - PubXState - NM N1 - Document feature - illus. incl. 4 tables, sketch maps N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-06-07 N1 - CODEN - NMGGA5 N1 - SubjectsTermNotLitGenreText - actinides; Cenozoic; clastic rocks; drinking water; Espanola Basin; geochemistry; ground water; hydrochemistry; igneous rocks; leaching; metal ores; metals; mining; Nambe mining district; natural hazards; Neogene; New Mexico; North America; potential deposits; Precambrian; Proterozoic; provenance; pyroclastics; rhyolites; Rocky Mountains; San Jose mining district; sandstone; Sangre de Cristo Mountains; Santa Fe County New Mexico; sedimentary rocks; spectra; Tertiary; Tesuque Formation; U. S. Rocky Mountains; United States; upper Precambrian; uranium; uranium ores; volcanic ash; volcanic rocks; water quality; water wells; X-ray diffraction data; X-ray fluorescence spectra ER - TY - JOUR T1 - Quartz-kyanite pods in the Tusas Mountains, northern New Mexico; a sheared and metamorphosed fossil hydrothermal system in the Vadito Group metarhyolite AN - 921716154; 2012-024036 AB - Lenses and pods or knobs of quartz-kyanite schist occur within a stratiform, map-scale white mica schist horizon in the 1.7 Ga. Vadito Group metarhyolite in the Tusas Mountains of northern New Mexico. Unusually high Al-bulk compositions in the large quartz-kyanite pods are likely the result multiple alteration processes that operated during the long history of volcanism and four episodes of deformation and metamorphism. Geochemical data collected in sampling traverses across the Vadito Group metarhyolite through the quartz-kyanite pods and sericite schist layer, combined with mineral textures and map patterns, provided the means to evaluate the origin and tectonic evolution of these unusual rocks. Geochemical trends from the sampling traverses show symmetrical depletion of Ca, Na, K, Fe, and enrichment of Si toward the centers of the quartz-kyanite pods, indicating alteration typical of shear zones and hydrothermal zones, but atypical of weathering profiles. Map patterns, geochemistry and mineral textures suggest the aligned quartz-kyanite pods may be the metamorphosed remnants of a hydrothermal alteration zone that was active during Vadito Group volcanism. We envision that hot acidic fluids migrated along fractures, altering rhyolite host rocks, and producing lenses and zones of clay and other minerals including pyrophyllite, chloritoid and possibly andalusite and staurolite. Weakened hydrothermally altered zones (represented by the quartz-kyanite pods) were linked together into a map-scale white-mica-rich S, shear zone during D (sub 1) metamorphism, causing additional metasomatic leaching of mobile elements (e.g. Ca, Na, Fe, K) that enhanced the concentration of silica and aluminum in this zone. Quartz-kyanite oxygen isotope thermometry on two distinct varieties of kyanite, produced delta (super 18) O values of 7.0 and 7.5 per mil, corresponding to temperatures of formation of 530 degrees C and 590 degrees C, and correlate with peak metamorphic conditions. Light delta (super 18) O values may indicate an early hydrothermal system that acted on these rocks prior to metamorphism. We hypothesize a P-T path for the quartz-kyanite pods that began with sub-surface (1-2 km) hydrothermal alteration of Vadito Group metarhyolite and the production of kaolinite at temperatures less than <300 degrees C, and ended with peak metamorphism within the kyanite stability field during D (sub 2) , at conditions of around 500 degrees C and 400 MPa. JF - Guidebook - New Mexico Geological Society AU - Simmons, Mary C AU - Karlstrom, Karl E AU - Williams, Michael W AU - Larson, Toti E A2 - Koning, Daniel J. A2 - Karlstrom, Karl E. A2 - Kelley, Shari A. A2 - Lueth, Virgil W. A2 - Aby, Scott B. Y1 - 2011 PY - 2011 DA - 2011 SP - 359 EP - 378 PB - New Mexico Geological Society, Socorro, NM VL - 62 SN - 0077-8567, 0077-8567 KW - United States KW - silicates KW - metaigneous rocks KW - Rio Arriba County New Mexico KW - alteration KW - andalusite KW - pyrophyllite KW - silica minerals KW - metarhyolite KW - New Mexico KW - metasomatism KW - temperature KW - chloritoid KW - major elements KW - folds KW - metamorphic rocks KW - orthosilicates KW - hydrothermal alteration KW - framework silicates KW - mineral assemblages KW - Tusas Mountains KW - faults KW - lenses KW - shear zones KW - Precambrian KW - textures KW - schists KW - northern New Mexico KW - kyanite KW - deformation KW - metamorphism KW - Vadito Group KW - nesosilicates KW - shear KW - quartz KW - sheet silicates KW - leaching KW - staurolite KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921716154?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Guidebook+-+New+Mexico+Geological+Society&rft.atitle=Quartz-kyanite+pods+in+the+Tusas+Mountains%2C+northern+New+Mexico%3B+a+sheared+and+metamorphosed+fossil+hydrothermal+system+in+the+Vadito+Group+metarhyolite&rft.au=Simmons%2C+Mary+C%3BKarlstrom%2C+Karl+E%3BWilliams%2C+Michael+W%3BLarson%2C+Toti+E&rft.aulast=Simmons&rft.aufirst=Mary&rft.date=2011-01-01&rft.volume=62&rft.issue=&rft.spage=359&rft.isbn=9781585460977&rft.btitle=&rft.title=Guidebook+-+New+Mexico+Geological+Society&rft.issn=00778567&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - 62nd annual field conference of the New Mexico Geological Society N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 71 N1 - PubXState - NM N1 - Document feature - illus. incl. 3 tables, geol. sketch maps N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-06-07 N1 - CODEN - NMGGA5 N1 - SubjectsTermNotLitGenreText - alteration; andalusite; chloritoid; deformation; faults; folds; framework silicates; hydrothermal alteration; kyanite; leaching; lenses; major elements; metaigneous rocks; metamorphic rocks; metamorphism; metarhyolite; metasomatism; mineral assemblages; nesosilicates; New Mexico; northern New Mexico; orthosilicates; Precambrian; pyrophyllite; quartz; Rio Arriba County New Mexico; schists; shear; shear zones; sheet silicates; silica minerals; silicates; staurolite; temperature; textures; Tusas Mountains; United States; Vadito Group ER - TY - JOUR T1 - Constraints on burial depth and yield of the 25 May 2009 North Korean test from hydrodynamic simulations in a granite medium AN - 921715376; 2012-023888 AB - Yield : depth of burial (DoB) tradeoff curves (TOCs) based on seismic magnitudes of the 25 May 2009 North Korean test depend strongly on the choice of empirical cavity radius (R (sub c) ) scaling model. Ambiguities over R (sub c) scaling, particularly at large scaled DoB (SDoB), translate into unacceptably large systematic errors on yield estimates for this test. Hydrodynamic calculations involving realistic material response models offer a viable alternative to characterize R (sub c) scaling for a range of SDoB where limited data from past nuclear tests exist. Results of such calculations are presented for a granite medium with a material response validated by modeling four phenomenological criteria for past nuclear tests in granite (free field velocity, energy partitioning into the seismic wavefield, velocity attenuation, and measured R (sub c) ). These results unambiguously favor the R (sub c) scaling model of Denny and Johnson (DJ91) and the TOC based on that model. Lower bounds on yield and DoB of the North Korean test are constrained by predictions of an SDoB threshold for free surface damage from 2-D simulations since no such reported damage was observed for this test. Constrained by the hydrodynamic simulations, the DJ91 model indicates the minimum yield and DoB for the 25 May 2009 North Korean test is 5.7 kilotons and 375 m. JF - Geophysical Research Letters AU - Rougier, Esteban AU - Patton, Howard J AU - Knight, Earl E AU - Bradley, Christopher R Y1 - 2011 PY - 2011 DA - 2011 EP - Citation L16316 PB - American Geophysical Union, Washington, DC VL - 38 IS - 16 SN - 0094-8276, 0094-8276 KW - Far East KW - explosions KW - igneous rocks KW - granites KW - North Korea KW - mechanical properties KW - Korea KW - rock mechanics KW - spalling KW - models KW - plutonic rocks KW - hydrodynamics KW - testing KW - nuclear explosions KW - Asia KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921715376?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Constraints+on+burial+depth+and+yield+of+the+25+May+2009+North+Korean+test+from+hydrodynamic+simulations+in+a+granite+medium&rft.au=Rougier%2C+Esteban%3BPatton%2C+Howard+J%3BKnight%2C+Earl+E%3BBradley%2C+Christopher+R&rft.aulast=Rougier&rft.aufirst=Esteban&rft.date=2011-01-01&rft.volume=38&rft.issue=16&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2011GL048269 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 24 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2012-06-07 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - Asia; explosions; Far East; granites; hydrodynamics; igneous rocks; Korea; mechanical properties; models; North Korea; nuclear explosions; plutonic rocks; rock mechanics; spalling; testing DO - http://dx.doi.org/10.1029/2011GL048269 ER - TY - JOUR T1 - Topography, the geoid, and compensation mechanisms for the Southern Rocky Mountains AN - 921715033; 2012-021717 AB - The southern Rockies of Colorado are anomalously high (elevations greater than 2800 m), topographically rough (implying active uplift), and underlain by significant low-velocity anomalies in the upper mantle that suggest an intimate relationship between mantle geodynamic processes and the surface topography. The region is in isostatic equilibrium (i.e., near-zero free-air gravity anomaly); however, the poor correlation between the high topography and crustal thickness makes the application of simple compensation models (e.g., pure Heiskanen or Pratt-Hayford) problematic. Knowledge of how the current topography of the Rockies is isostatically compensated could provide constraints on the relative role of sublithospheric buoyancy versus lithospheric support. Here we evaluate the geoid and its relationship to the topography (using the geoid-to-elevation ratio (GTR) in the spatial domain and the admittance in the frequency domain) to constrain the mechanism of compensation. We separate the upper mantle geoid anomalies from those with deeper sources through the use of spherical harmonic filtering of the EGM2008 geoid. We exploit the fact that at wavelengths greater than the flexural wavelength where features are isostatically compensated, the geoid/topography ratio can be used to estimate the depth of compensation and the elastic thickness of the lithosphere. The results presented below indicate that the main tectonic provinces of the western United States have moderate geoid/topography ratios between 3.5 and 5.5 m/km ( approximately 3.9 for the southern Rockies, approximately 4.25 for the Colorado Plateau, and approximately 5.2 for the Northern Basin and Range) suggesting shallow levels of isostatic compensation. In terms of the elastic thickness of the lithosphere, our results indicate an elastic thickness of less than 20 km. These value support the notion that a major portion of the buoyancy that has driven uplift resides at depths less than 100 km and that upper mantle processes such as small-scale convection may play a significant role in the buoyant uplift of the southern Rockies (as well as other actively uplifting areas of the western United States). Further support for this hypothesis is provided by high coherence for the geoid-topography relationship for nearly all wavelengths between 50 and 1000 km. JF - Geochemistry, Geophysics, Geosystems - G3 AU - Coblentz, D AU - Chase, C G AU - Karlstrom, K E AU - van Wijk, J Y1 - 2011 PY - 2011 DA - 2011 EP - Citation Q04002 PB - American Geophysical Union and The Geochemical Society VL - 12 IS - 4 KW - United States KW - upper mantle KW - North America KW - Colorado Plateau KW - Basin and Range Province KW - elevation KW - mantle KW - U. S. Rocky Mountains KW - geodesy KW - isostasy KW - gravity anomalies KW - gravity field KW - topography KW - tectonophysics KW - Southern Rocky Mountains KW - Bouguer anomalies KW - tectonics KW - Colorado KW - Rocky Mountains KW - geoid KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/921715033?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochemistry%2C+Geophysics%2C+Geosystems+-+G3&rft.atitle=Topography%2C+the+geoid%2C+and+compensation+mechanisms+for+the+Southern+Rocky+Mountains&rft.au=Coblentz%2C+D%3BChase%2C+C+G%3BKarlstrom%2C+K+E%3Bvan+Wijk%2C+J&rft.aulast=Coblentz&rft.aufirst=D&rft.date=2011-01-01&rft.volume=12&rft.issue=4&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geochemistry%2C+Geophysics%2C+Geosystems+-+G3&rft.issn=1525-2027&rft_id=info:doi/10.1029%2F2010GC003459 L2 - http://g-cubed.org LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 62 N1 - Document feature - illus. incl. sketch map N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - Basin and Range Province; Bouguer anomalies; Colorado; Colorado Plateau; elevation; geodesy; geoid; gravity anomalies; gravity field; isostasy; mantle; North America; Rocky Mountains; Southern Rocky Mountains; tectonics; tectonophysics; topography; U. S. Rocky Mountains; United States; upper mantle DO - http://dx.doi.org/10.1029/2010GC003459 ER - TY - JOUR T1 - Sea ice and iceberg dynamic interaction AN - 919639464; 2012-020029 AB - A model of iceberg motion has been implemented in the Los Alamos sea ice model (CICE). Individual bergs are tracked under the influence of winds, currents, sea surface tilt, Coriolis, and sea ice forcing. In turn, sea ice is affected by the presence of icebergs, primarily as obstacles that cause the sea ice to ridge on the upstream side or create open water on the downstream side of the bergs. Open water formed near icebergs due to sea ice ridging and blocking of sea ice advection increases level and ridged ice downstream of the bergs through increased frazil ice formation. Resulting anomalies in sea ice area and thickness (compared with a simulation without icebergs) are transported with the sea ice flow, expanding over time. Although local changes in the sea ice distribution may be important for smaller-scale studies, these anomalies are small compared with the total volume of sea ice and their effect on climate-scale variables appears to be insignificant. JF - Journal of Geophysical Research AU - Hunke, Elizabeth C AU - Comeau, Darin Y1 - 2011 PY - 2011 DA - 2011 EP - Citation C05008 PB - American Geophysical Union, Washington, DC VL - 116 IS - C5 SN - 0148-0227, 0148-0227 KW - Southern Ocean KW - monthly variations KW - ice pack KW - icebergs KW - ice cover thickness KW - sea ice KW - ice cover KW - models KW - ice KW - glacial geology KW - climate forcing KW - Weddell Sea KW - ice cover distribution KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/919639464?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Sea+ice+and+iceberg+dynamic+interaction&rft.au=Hunke%2C+Elizabeth+C%3BComeau%2C+Darin&rft.aulast=Hunke&rft.aufirst=Elizabeth&rft.date=2011-01-01&rft.volume=116&rft.issue=C5&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2010JC006588 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 55 N1 - PubXState - DC N1 - Document feature - illus. incl. 2 tables, sketch maps N1 - Last updated - 2012-06-07 N1 - CODEN - JGREA2 N1 - SubjectsTermNotLitGenreText - climate forcing; glacial geology; ice; ice cover; ice cover distribution; ice cover thickness; icebergs; ice pack; models; monthly variations; sea ice; Southern Ocean; Weddell Sea DO - http://dx.doi.org/10.1029/2010JC006588 ER - TY - JOUR T1 - Apparent stress variations near the Osa Peninsula, Costa Rica, influenced by subducted bathymetric features AN - 916837306; 2012-012223 AB - We compute apparent stress for 114 aftershocks (0.9 < or = M (sub L) < or = 3.7) of the 1999 M (sub w) = 6.9 Quepos, Costa Rica, thrust-faulting earthquake to examine the influence of subducting plate topographic complexity near the Osa Peninsula on earthquake rupture. Using seismic coda techniques, we find a heterogeneous distribution in apparent stress of 0.1-2.5 MPa (mean 0.6 MPa) for these aftershocks. Mean aftershock apparent stress is more than twice the global mean for thrust-faulting earthquakes at oceanic subduction zones and 1.5 times the mean for events just northward along the margin near the Nicoya Peninsula where the subducting plate has lower relief. We also find constant source scaling for the Osa aftershocks. The variation in apparent stress found near the Osa Peninsula, and high mean as compared to global and regional values, suggest areas of stress concentration in the region of bathymetric complexity in the subduction zone. JF - Geophysical Research Letters AU - Moyer, Pamela A AU - Bilek, Susan L AU - Phillips, W Scott Y1 - 2011 PY - 2011 DA - 2011 EP - Citation L02304 PB - American Geophysical Union, Washington, DC VL - 38 IS - 2 SN - 0094-8276, 0094-8276 KW - subduction zones KW - asperities KW - Costa Rica KW - stress KW - subduction KW - seamounts KW - thrust faults KW - bottom features KW - Osa Peninsula KW - tectonics KW - geomorphology KW - bathymetry KW - Central America KW - faults KW - fault zones KW - 16:Structural geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/916837306?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Apparent+stress+variations+near+the+Osa+Peninsula%2C+Costa+Rica%2C+influenced+by+subducted+bathymetric+features&rft.au=Moyer%2C+Pamela+A%3BBilek%2C+Susan+L%3BPhillips%2C+W+Scott&rft.aulast=Moyer&rft.aufirst=Pamela&rft.date=2011-01-01&rft.volume=38&rft.issue=2&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2010GL045955 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 38 N1 - PubXState - DC N1 - Document feature - illus. incl. sketch maps N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-06-07 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - asperities; bathymetry; bottom features; Central America; Costa Rica; fault zones; faults; geomorphology; Osa Peninsula; seamounts; stress; subduction; subduction zones; tectonics; thrust faults DO - http://dx.doi.org/10.1029/2010GL045955 ER - TY - JOUR T1 - Structure and stability of nickel hydroxide at high T-P conditions AN - 907920678; 2012-003154 AB - Nickel hydroxide, Ni(OH) (sub 2) , belongs to the CdI (sub 2) -type, layered hydroxide family M(OH) (sub 2) (M = Mg, Ca, Ni, Co, etc.) and is of interest from the crystal-chemical viewpoint, as it provides a model structure for studying hydrogen-mediated interatomic interactions. M(OH) (sub 2) phases are also interesting for studying Earth's deep water cycle. Though uncommon in the deep Earth, they are present as component units in the structures of many hydrous minerals (such as hydrous magnesium silicate phase E), which are potential hosts for water in the mantle. In addition, Ni(OH) (sub 2) is a cathode material in Ni-based rechargeable alkaline batteries. Thus studying the structure and stability of Ni(OH) (sub 2) at various conditions is of significance both geologically and for its practical applications. In this study, using in situ time-of-flight neutron and energy-dispersive synchrotron X-ray diffraction, we have examined the structure and stability of nickel hydroxide at temperatures up to 623 K and/or pressures up to 8 GPa. To avoid the large incoherent scattering of neutrons by hydrogen, a deuterated sample Ni(OD) (sub 2) was synthesized and used for neutron experiments. For synchrotron experiments, both Ni(OH) (sub 2) and Ni(OD) (sub 2) were measured, allowing studying the H/D isotopic effects. Rietveld analysis of neutron data and peak fitting of synchrotron patterns allowed determination of coefficients of thermal expansion, bulk moduli and other thermoelastic parameters. Moreover, the atomic positions and atomic displacement parameters, particularly of D, have been obtained, and the role of hydrogen-mediated interatomic interactions in the mechanisms of compression, thermal expansion and phase stability of nickel hydroxide are discussed. These results are also compared with those of other M(OH) (sub 2) phases to determine the structural and stability systematics of the M(OH) (sub 2) family. JF - Mineralogical Magazine AU - Xu, H AU - Hickmott, D D AU - Zhang, J AU - Zhao, Y AU - Vogel, S C AU - Daemen, L L AU - Anonymous Y1 - 2011 PY - 2011 DA - 2011 SP - 2197 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - experimental studies KW - nickel hydroxides KW - pressure KW - X-ray diffraction data KW - thermoelastic properties KW - stability KW - crystal structure KW - nickel oxides KW - high pressure KW - temperature KW - synchrotron radiation KW - laboratory studies KW - phase equilibria KW - metals KW - nickel KW - oxides KW - applications KW - thermodynamic properties KW - synthesis KW - crystal chemistry KW - industrial minerals KW - high temperature KW - P-T conditions KW - 01C:Mineralogy of non-silicates KW - 28A:Economic geology, geology of nonmetal deposits UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/907920678?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Structure+and+stability+of+nickel+hydroxide+at+high+T-P+conditions&rft.au=Xu%2C+H%3BHickmott%2C+D+D%3BZhang%2C+J%3BZhao%2C+Y%3BVogel%2C+S+C%3BDaemen%2C+L+L%3BAnonymous&rft.aulast=Xu&rft.aufirst=H&rft.date=2011-01-01&rft.volume=75&rft.issue=3&rft.spage=2197&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/2188.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - applications; crystal chemistry; crystal structure; experimental studies; high pressure; high temperature; industrial minerals; laboratory studies; metals; nickel; nickel hydroxides; nickel oxides; oxides; P-T conditions; phase equilibria; pressure; stability; synchrotron radiation; synthesis; temperature; thermodynamic properties; thermoelastic properties; X-ray diffraction data ER - TY - JOUR T1 - The interdependence of mechanisms underlying climate-driven vegetation mortality AN - 899172975; 15749668 AB - Climate-driven vegetation mortality is occurring globally and is predicted to increase in the near future. The expected climate feedbacks of regional-scale mortality events have intensified the need to improve the simple mortality algorithms used for future predictions, but uncertainty regarding mortality processes precludes mechanistic modeling. By integrating new evidence from a wide range of fields, we conclude that hydraulic function and carbohydrate and defense metabolism have numerous potential failure points, and that these processes are strongly interdependent, both with each other and with destructive pathogen and insect populations. Crucially, most of these mechanisms and their interdependencies are likely to become amplified under a warmer, drier climate. Here, we outline the observations and experiments needed to test this interdependence and to improve simulations of this emergent global phenomenon. JF - Trends in Ecology & Evolution AU - McDowell, Nate G AU - Beerling, David J AU - Breshears, David D AU - Fisher, Rosie A AU - Raffa, Kenneth F AU - Stitt, Mark PY - 2011 SP - 523 EP - 532 PB - Elsevier B.V., The Boulevard Kidlington Oxford OX5 1GB United Kingdom VL - 26 IS - 10 SN - 0169-5347, 0169-5347 KW - Ecology Abstracts KW - Mortality KW - Hydraulics KW - Carbohydrate metabolism KW - Reviews KW - Climate KW - Algorithms KW - Vegetation KW - Feedback KW - Pathogens KW - Carbohydrates KW - D 04040:Ecosystem and Ecology Studies UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/899172975?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Trends+in+Ecology+%26+Evolution&rft.atitle=The+interdependence+of+mechanisms+underlying+climate-driven+vegetation+mortality&rft.au=McDowell%2C+Nate+G%3BBeerling%2C+David+J%3BBreshears%2C+David+D%3BFisher%2C+Rosie+A%3BRaffa%2C+Kenneth+F%3BStitt%2C+Mark&rft.aulast=McDowell&rft.aufirst=Nate&rft.date=2011-01-01&rft.volume=26&rft.issue=10&rft.spage=523&rft.isbn=&rft.btitle=&rft.title=Trends+in+Ecology+%26+Evolution&rft.issn=01695347&rft_id=info:doi/10.1016%2Fj.tree.2011.06.003 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-10-01 N1 - Last updated - 2016-01-21 N1 - SubjectsTermNotLitGenreText - Hydraulics; Mortality; Carbohydrate metabolism; Reviews; Climate; Algorithms; Vegetation; Feedback; Carbohydrates; Pathogens DO - http://dx.doi.org/10.1016/j.tree.2011.06.003 ER - TY - JOUR T1 - Greenland ice sheet surface melt extent and trends: 1960-2010 AN - 899137810; 15775746 AB - Observed meteorological data and a high-resolution (5 km) model were used to simulate Greenland ice sheet surface melt extent and trends before the satellite era (1960-79) and during the satellite era through 2010 degree . The model output was compared with passive microwave satellite observations of melt extent. For 1960-2010 the average simulated melt extent was 15 plus or minus 5%. For the period 1960-72, simulated melt extent decreased by an average of 6%, whereas 1973-2010 had an average increase of 13%, with record melt extent in 2010. The trend in simulated melt extent since 1972 indicated that the melt extent in 2010 averaged twice that in the early 1970s. The maximum and mean melt extents for 2010 were 52% ( similar to 9.5 x 10 super(5) km super(2)) and 28% ( similar to 5.2 x 10 super(5) km super(2)), respectively, due to higher-than-average winter and summer temperatures and lower-than-average winter precipitation. For 2010, the southwest Greenland melt duration was 41-60 days longer than the 1960-2010 average, while the northeast Greenland melt duration was up to 20 days shorter. From 1960 to 1972 the melting period (with a >10% melt extent) decreased by an average of 3 days a super(-1). After 1972, the period increased by an average of 2 days a super(-1), indicating an extended melting period for the ice sheet of about 70 days: 40 and 30 days in spring and autumn, respectively. JF - Journal of Glaciology AU - Mernild, SH AU - Mote, T L AU - Liston, GE AD - Climate, Ocean and Sea Ice Modeling Group, Computational Physics and Methods, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA, mernild@lanl.gov Y1 - 2011 PY - 2011 DA - 2011 SP - 621 EP - 628 VL - 57 IS - 204 SN - 0022-1430, 0022-1430 KW - ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Aqualine Abstracts; Meteorological & Geoastrophysical Abstracts KW - Remote Sensing KW - Meteorological data KW - Greenland ice sheet KW - Melting KW - Greenland KW - Microwaves KW - Satellite Technology KW - PN, Greenland, Greenland Ice Sheet KW - Temperature KW - Precipitation KW - Summer temperatures KW - Greenland, Oestgroenland KW - Satellite instrumentation KW - Model Studies KW - Satellite data KW - Ice sheets KW - Glaciation KW - Winter precipitation KW - AQ 00001:Water Resources and Supplies KW - M2 551.324:Land Ice/Glaciers (551.324) KW - Q2 09148:Palaeo-studies KW - SW 0820:Snow, ice and frost UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/899137810?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Glaciology&rft.atitle=Greenland+ice+sheet+surface+melt+extent+and+trends%3A+1960-2010&rft.au=Mernild%2C+SH%3BMote%2C+T+L%3BListon%2C+GE&rft.aulast=Mernild&rft.aufirst=SH&rft.date=2011-01-01&rft.volume=57&rft.issue=204&rft.spage=621&rft.isbn=&rft.btitle=&rft.title=Journal+of+Glaciology&rft.issn=00221430&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-10-01 N1 - Last updated - 2014-05-02 N1 - SubjectsTermNotLitGenreText - Meteorological data; Microwaves; Glaciation; Satellite data; Ice sheets; Greenland ice sheet; Winter precipitation; Summer temperatures; Satellite instrumentation; Melting; Remote Sensing; Satellite Technology; Temperature; Precipitation; Model Studies; Greenland; PN, Greenland, Greenland Ice Sheet; Greenland, Oestgroenland ER - TY - JOUR T1 - Incorporating arbitrary basal topography in the variational formulation of ice-sheet models AN - 888110755; 15582312 AB - There are many advantages to formulating an ice-sheet model in terms of a variational principle. In particular, this applies to the specification of boundary conditions, which might otherwise be problematic to implement. Here we focus primarily on the frictional basal sliding boundary condition in a non-Newtonian Stokes model. This type of boundary condition is particularly difficult because it is heterogeneous, requiring both a Dirichlet (no-penetration) condition normal to the bed, and a Neumann (frictional sliding) condition tangential to the bed. In general, Neumann conditions correspond to natural boundary conditions in a variational principle; that is, they arise naturally in the variational formulation and thus need not be explicitly specified. While the same is not necessarily true of Dirichlet conditions, it is possible to enforce a no-penetration condition using Lagrange multipliers within the variational principle so that the Dirichlet condition becomes a natural boundary condition. Thus, in the case of ice sheets, all relevant boundary conditions may be incorporated in the variational functional, making them particularly easy to discretize. For the Stokes model, the resulting basal boundary condition is valid for arbitrary topographic slopes. Here we apply the same methodology to the Blatter-Pattyn higher-order approximate model, which is ordinarily limited to small basal slopes by the small-aspect-ratio approximation. We introduce a modification that improves on the accuracy of the standard Blatter-Pattyn model for all values of the basal slope, as we demonstrate in the slow sliding regime for which analytical results are available. The remaining error is due to the effects of the small-aspect-ratio approximation in the Blatter-Pattyn model. JF - Journal of Glaciology AU - Dukowicz, J K AU - Price, S F AU - Lipscomb, W H AD - Climate, Ocean, and Sea Ice Modeling Project, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA, sprice@lanl.gov Y1 - 2011 PY - 2011 DA - 2011 SP - 461 EP - 467 VL - 57 IS - 203 SN - 0022-1430, 0022-1430 KW - ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Aqualine Abstracts; Meteorological & Geoastrophysical Abstracts KW - Hydrological Regime KW - Boundary Conditions KW - Errors KW - Specifications KW - Boundary conditions KW - Model Studies KW - Ice sheets KW - Glaciation KW - Standards KW - Slumping KW - Slopes KW - Topography KW - Modelling KW - AQ 00001:Water Resources and Supplies KW - Q2 09150:Ice KW - M2 551.33:Glacial geology (551.33) KW - SW 0820:Snow, ice and frost UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/888110755?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Glaciology&rft.atitle=Incorporating+arbitrary+basal+topography+in+the+variational+formulation+of+ice-sheet+models&rft.au=Dukowicz%2C+J+K%3BPrice%2C+S+F%3BLipscomb%2C+W+H&rft.aulast=Dukowicz&rft.aufirst=J&rft.date=2011-01-01&rft.volume=57&rft.issue=203&rft.spage=461&rft.isbn=&rft.btitle=&rft.title=Journal+of+Glaciology&rft.issn=00221430&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-09-01 N1 - Last updated - 2014-05-02 N1 - SubjectsTermNotLitGenreText - Glaciation; Slumping; Modelling; Ice sheets; Boundary conditions; Topography; Hydrological Regime; Boundary Conditions; Standards; Errors; Slopes; Specifications; Model Studies ER - TY - JOUR T1 - The apparent explosion moment; inferences of volumetric moment due to source medium damage by underground nuclear explosions AN - 881448957; 2011-062559 AB - Classical explosion source theory relates isotropic seismic moment to the steady state level of the reduced displacement potential. The theoretical isotropic moment for an incompressible source region M (sub t) is proportional to cavity volume V (sub c) created by pressurization of materials around the point of energy release. Source medium damage due to nonlinear deformations caused by the explosion will also induce volume change V (sub d) and radiate seismic waves as volumetric, double-couple, and compensated linear vector dipole (CLVD) body force systems. A new source model is presented where K is a relative measure of moment M (sub CLVD) with respect to the net moment from volumetric sources V (sub c) and V (sub d) . K values from moment tensor inversions steadily decrease from approximately 2.5 at lower yields to approximately 1.0 for the highest-yield shots on Pahute Mesa. A value of 1.0 implies M (sub CLVD) =0 and, by inference, small V (sub d) . We hypothesize that the extent to which damage adds (or subtracts) volumetric moment is controlled by material properties and dynamics of stress wave rebound, shock wave interactions with the free surface, gravitational unloading, and slapdown of spalled near-surface layers. This hypothesis is tested by comparing measurements of isotropic moment M (sub I) with estimates of M (sub t) based on V (sub c) scaling relationships and velocity-density models. The results support the hypothesis and the conclusion that M (sub I) represents the "apparent explosion moment" since it has contributions from direct effects due to cavity formation and indirect effects due to material damage. Implications for yield estimation using M (sub I) are discussed in general and for the North Korean tests. JF - Journal of Geophysical Research AU - Patton, Howard J AU - Taylor, Steven R Y1 - 2011 PY - 2011 DA - 2011 EP - Citation B03310 PB - American Geophysical Union, Washington, DC VL - 116 IS - B3 SN - 0148-0227, 0148-0227 KW - United States KW - explosions KW - seismic moment KW - stress KW - damage KW - seismic sources KW - deformation KW - Nye County Nevada KW - Pahute Mesa KW - volume KW - isotropy KW - ground motion KW - velocity KW - nuclear explosions KW - earthquakes KW - Nevada KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/881448957?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=The+apparent+explosion+moment%3B+inferences+of+volumetric+moment+due+to+source+medium+damage+by+underground+nuclear+explosions&rft.au=Patton%2C+Howard+J%3BTaylor%2C+Steven+R&rft.aulast=Patton&rft.aufirst=Howard&rft.date=2011-01-01&rft.volume=116&rft.issue=B3&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2010JB007937 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2011-01-01 N1 - Number of references - 64 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - damage; deformation; earthquakes; explosions; ground motion; isotropy; Nevada; nuclear explosions; Nye County Nevada; Pahute Mesa; seismic moment; seismic sources; stress; United States; velocity; volume DO - http://dx.doi.org/10.1029/2010JB007937 ER - TY - JOUR T1 - Isotopic tracers of paleohydrologic change in large lakes of the Bolivian Altiplano AN - 860379692; 14361418 AB - We have developed an 87Sr/86Sr, 234U/238U, and delta 18O data set from carbonates associated with late Quaternary paleolake cycles on the southern Bolivian Altiplano as a tool for tracking and understanding the causes of lake-level fluctuations. Distinctive groupings of 87Sr/86Sr ratios are observed. Ratios are highest for the Ouki lake cycle (120-95ka) at 0.70932, lowest for Coipasa lake cycle (12.8-11.4ka) at 0.70853, and intermediate at 0.70881 to 0.70884 for the Salinas (95-80ka), Inca Huasi (45ka), Sajsi (24-20.5ka), and Tauca (18.1-14.1ka) lake cycles. These Sr ratios reflect variable contributions from the eastern and western Cordilleras. The Laca hydrologic divide exerts a primary influence on modern and paleolake 87Sr/86Sr ratios; waters show higher 87Sr/86Sr ratios north of this divide. Most lake cycles were sustained by slightly more rainfall north of this divide but with minimal input from Lake Titicaca. The Coipasa lake cycle appears to have been sustained mainly by rainfall south of this divide. In contrast, the Ouki lake cycle was an expansive lake, deepest in the northern (Poopo) basin, and spilling southward. These results indicate that regional variability in central Andean wet events can be reconstructed using geochemical patterns from this lake system. JF - Quaternary Research AU - Placzek, Christa J AU - Quade, Jay AU - Patchett, PJonathan AD - Los Alamos National Laboratory, MS-J514, Los Alamos, NM 87545, USA, cplaczek@lanl.gov Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 231 EP - 244 PB - Elsevier Science, P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 75 IS - 1 SN - 0033-5894, 0033-5894 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 1: Biological Sciences & Living Resources; Meteorological & Geoastrophysical Abstracts KW - Altiplano KW - Lake KW - Climate KW - North Atlantic KW - ENSO KW - Bolivia KW - Paleolakes KW - Strontium KW - Paleohydrology KW - Variability KW - Salinity variations KW - Palaeo studies KW - Rainfall KW - Freshwater KW - Watersheds KW - Strontium isotopes KW - Paleoclimates KW - Spatial variations KW - Tracers KW - Lakes KW - Lake Basins KW - Bolivia, Altiplano KW - Carbonates KW - Tracking KW - Isotopic Tracers KW - South America, Titicaca L. KW - Fluctuations KW - AQ 00001:Water Resources and Supplies KW - SW 0850:Lakes KW - M2 551.583:Variations (551.583) KW - Q1 08187:Palaeontology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/860379692?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Quaternary+Research&rft.atitle=Isotopic+tracers+of+paleohydrologic+change+in+large+lakes+of+the+Bolivian+Altiplano&rft.au=Placzek%2C+Christa+J%3BQuade%2C+Jay%3BPatchett%2C+PJonathan&rft.aulast=Placzek&rft.aufirst=Christa&rft.date=2011-01-01&rft.volume=75&rft.issue=1&rft.spage=231&rft.isbn=&rft.btitle=&rft.title=Quaternary+Research&rft.issn=00335894&rft_id=info:doi/10.1016%2Fj.yqres.2010.08.004 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2011-04-01 N1 - Last updated - 2016-02-04 N1 - SubjectsTermNotLitGenreText - Spatial variations; Tracers; Lakes; Palaeo studies; Strontium isotopes; Tracking; Salinity variations; Paleoclimates; Paleohydrology; Variability; Carbonates; Rainfall; Isotopic Tracers; Lake Basins; Watersheds; Fluctuations; Bolivia, Altiplano; South America, Titicaca L.; Freshwater DO - http://dx.doi.org/10.1016/j.yqres.2010.08.004 ER - TY - JOUR T1 - Heavy Fermion Behavior in the New Antiferromagnetic Compound UIr sub(4)Al sub(15) AN - 1823943365; PQ0001751043 AB - We report the synthesis, crystal structure, and physical properties on the new compound UIr sub(4)Al sub(15) which crystallizes with the NdRh sub(4)Al sub(15.4) structure type in the tetragonal space group P4 sub(2)/nmc. From single crystal X-ray diffraction, the compound was found to have unit cell parameters a = b = 9.0239(6) A and c = 15.513(2) A. The compound has been synthesized from the flux growth method using an excess of Al metal. UIr sub(4)Al sub(15) undergoes antiferromagnetic order at approximately 20 K which is consistent with kink-like features in both electrical resistivity and specific heat measurements. Electrical resistivity under hydrostatic pressure shows that the antiferromagnetic ordering temperature is slightly shifted to higher temperatures which is suggestive of the very little pressure dependence and the localized nature of the U 5f electrons. Electronic structure calculations indicated that the Fermi surface of UIr sub(4)Al sub(15) was quasi two-dimensional. JF - Journal of Physics: Conference Series AU - Tobash, P H AU - Scott, B L AU - Sidorov, V A AU - Ronning, F AU - Gofryk, K AU - Thompson, J D AU - Albers, R C AU - Zhu, J-X AU - Jones, M D AU - Bauer, E D AD - Los Alamos National Laboratory, Los Alamos, NM 87545, USA, ptobash@lanl.gov Y1 - 2011///0, PY - 2011 DA - 0, 2011 SP - 1 EP - 5 PB - Institute of Physics Publishing Inc., The Public Ledger Building, Suite 929 Philadelphia PA 19106 United States VL - 273 SN - 1742-6588, 1742-6588 KW - Biotechnology and Bioengineering Abstracts KW - Temperature effects KW - Metals KW - Conferences KW - Heat KW - Crystal structure KW - Crystals KW - Pressure KW - X-ray diffraction KW - W 30970:Book & Conference Notices UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1823943365?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Abiotechresearch&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Physics%3A+Conference+Series&rft.atitle=Heavy+Fermion+Behavior+in+the+New+Antiferromagnetic+Compound+UIr+sub%284%29Al+sub%2815%29&rft.au=Tobash%2C+P+H%3BScott%2C+B+L%3BSidorov%2C+V+A%3BRonning%2C+F%3BGofryk%2C+K%3BThompson%2C+J+D%3BAlbers%2C+R+C%3BZhu%2C+J-X%3BJones%2C+M+D%3BBauer%2C+E+D&rft.aulast=Tobash&rft.aufirst=P&rft.date=2011-01-01&rft.volume=273&rft.issue=&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Journal+of+Physics%3A+Conference+Series&rft.issn=17426588&rft_id=info:doi/10.1088%2F1742-6596%2F273%2F1%2F012061 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-09-01 N1 - Last updated - 2016-09-29 N1 - SubjectsTermNotLitGenreText - Temperature effects; Metals; Conferences; Heat; Crystal structure; Crystals; X-ray diffraction; Pressure DO - http://dx.doi.org/10.1088/1742-6596/273/1/012061 ER - TY - JOUR T1 - Exploring the potentials and limitations of the time-reversal imaging of finite seismic sources AN - 1777467193; 2016-026456 AB - The characterisation of seismic sources with time-reversed wave fields is developing into a standard technique that has already been successful in numerous applications. While the time-reversal imaging of effective point sources is now well-understood, little work has been done to extend this technique to the study of finite rupture processes. This is despite the pronounced non-uniqueness in classic finite source inversions. The need to better constrain the details of finite rupture processes motivates the series of synthetic and real-data time reversal experiments described in this paper. We address questions concerning the quality of focussing in the source area, the localisation of the fault plane, the estimation of the slip distribution and the source complexity up to which time-reversal imaging can be applied successfully. The frequency band for the synthetic experiments is chosen such that it is comparable to the band usually employed for finite source inversion. Contrary to our expectations, we find that time-reversal imaging is useful only for effective point sources, where it yields good estimates of both the source location and the origin time. In the case of finite sources, however, the time-reversed field does not provide meaningful characterisations of the fault location and the rupture process. This result cannot be improved sufficiently with the help of different imaging fields, realistic modifications of the receiver geometry or weights applied to the time-reversed sources. The reasons for this failure are manifold. They include the choice of the frequency band, the incomplete recording of wave field information at the surface, the excitation of large-amplitude surface waves that deteriorate the depth resolution, the absence of a sink that should absorb energy radiated during the later stages of the rupture process, the invisibility of small slip and the neglect of prior information concerning the fault geometry and the inherent smoothness of seismologically inferred Earth models that prevents the beneficial occurrence of strong multiple-scattering. The condensed conclusion of our study is that the limitations of time-reversal imaging--at least in the frequency band considered here--start where the seismic source stops being effectively point-localised. JF - Solid Earth (SE, Gottingen) AU - Kremers, S AU - Fichtner, A AU - Brietzke, G B AU - Igel, H AU - Larmat, C AU - Huang, L AU - Kaeser, M Y1 - 2011 PY - 2011 DA - 2011 SP - 95 EP - 105 PB - Copernicus Publications, Gottingen VL - 2 IS - 1 SN - 1869-9510, 1869-9510 KW - Far East KW - density KW - strain KW - slip rates KW - elastic waves KW - frequency KW - simulation KW - surface waves KW - fault planes KW - seismicity KW - time factor KW - velocity KW - propagation KW - Asia KW - faults KW - real-time methods KW - seismograms KW - failures KW - focal mechanism KW - guided waves KW - numerical analysis KW - Tottori-ken Seibu earthquake 2000 KW - finite strain analysis KW - wave fields KW - distribution KW - depth KW - rupture KW - moment tensors KW - seismic waves KW - earthquakes KW - Japan KW - image analysis KW - arrays KW - amplitude KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1777467193?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Solid+Earth+%28SE%2C+Gottingen%29&rft.atitle=Exploring+the+potentials+and+limitations+of+the+time-reversal+imaging+of+finite+seismic+sources&rft.au=Kremers%2C+S%3BFichtner%2C+A%3BBrietzke%2C+G+B%3BIgel%2C+H%3BLarmat%2C+C%3BHuang%2C+L%3BKaeser%2C+M&rft.aulast=Kremers&rft.aufirst=S&rft.date=2011-01-01&rft.volume=2&rft.issue=1&rft.spage=95&rft.isbn=&rft.btitle=&rft.title=Solid+Earth+%28SE%2C+Gottingen%29&rft.issn=18699510&rft_id=info:doi/ L2 - http://www.solid-earth.net/2/95/2011/se-2-95-2011.pdf http://www.solid-earth.net/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. Reference includes data from Copernicus Gesellschaft, Katlenburg-Lindau, Germany N1 - Date revised - 2016-01-01 N1 - Number of references - 38 N1 - Document feature - illus. incl. sketch map N1 - Last updated - 2016-04-01 N1 - SubjectsTermNotLitGenreText - amplitude; arrays; Asia; density; depth; distribution; earthquakes; elastic waves; failures; Far East; fault planes; faults; finite strain analysis; focal mechanism; frequency; guided waves; image analysis; Japan; moment tensors; numerical analysis; propagation; real-time methods; rupture; seismic waves; seismicity; seismograms; simulation; slip rates; strain; surface waves; time factor; Tottori-ken Seibu earthquake 2000; velocity; wave fields ER - TY - JOUR T1 - Mars Odyssey neutron data; 2, Search for buried excess water ice deposits at nonpolar latitudes on Mars AN - 1692742992; 2015-058454 AB - Global maps of hydrogen abundance near the surface of Mars, interpreted as the mass percent of water-equivalent hydrogen (WEH) have been generated from measurements of neutron leakage fluxes from Mars. Although these data provide an unambiguous indicator of the presence of WEH, quantitative details of its magnitude and burial depth depend on the model of the host regolith that is used to interpret the data. Previous models assumed a spatially uniform surface cover layer having a one-to-two mass percent of WEH and thickness D covering a semi-infinite ice-rich deposit. These assumptions allowed the derivation of the relative proportions of ice and regolith in the lower layer, which had been used to create global maps of WEH in the near surface. In this paper we develop a new method that determines, from the Mars Odyssey Neutron Spectrometer (MONS) data, a self-consistent model of the WEH content of both the upper and lower layers as well as the thickness (D) of the upper layer. The results of our model suggest that large areas at nonpolar latitudes may contain water ice deposits that have abundances that are larger than can be held by normal pore volumes. These deposits are buried less than about 1 m below the surface and may represent buried water ice or high concentrations of hydrous minerals. Intriguingly, the most definitive MONS evidence at intermediate latitudes for excess ground ice corresponds to a region of Arcadia Planitia within which High Resolution Imaging Science Experiment (HiRISE) has observed fresh icy craters. JF - Journal of Geophysical Research AU - Feldman, William C AU - Pathare, Asmin AU - Maurice, Sylvestre AU - Prettyman, Thomas H AU - Lawrence, David J AU - Milliken, Ralph E AU - Travis, Bryan J Y1 - 2011 PY - 2011 DA - 2011 EP - Citation E11009 PB - American Geophysical Union, Washington, DC VL - 116 IS - E11 SN - 0148-0227, 0148-0227 KW - water KW - high-resolution methods KW - imagery KW - neutron methods KW - techniques KW - Mars KW - distribution KW - porosity KW - Mars Odyssey KW - Arcadia Planitia KW - exploration KW - terrestrial planets KW - planets KW - precipitation KW - ice KW - hydrogen KW - interpretation KW - spectroscopy KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1692742992?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Mars+Odyssey+neutron+data%3B+2%2C+Search+for+buried+excess+water+ice+deposits+at+nonpolar+latitudes+on+Mars&rft.au=Feldman%2C+William+C%3BPathare%2C+Asmin%3BMaurice%2C+Sylvestre%3BPrettyman%2C+Thomas+H%3BLawrence%2C+David+J%3BMilliken%2C+Ralph+E%3BTravis%2C+Bryan+J&rft.aulast=Feldman&rft.aufirst=William&rft.date=2011-01-01&rft.volume=116&rft.issue=E11&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JE003806 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - Number of references - 46 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2015-07-02 N1 - SubjectsTermNotLitGenreText - Arcadia Planitia; distribution; exploration; high-resolution methods; hydrogen; ice; imagery; instruments; interpretation; Mars; Mars Odyssey; neutron methods; planets; porosity; precipitation; spectroscopy; techniques; terrestrial planets; water DO - http://dx.doi.org/10.1029/2011JE003806 ER - TY - BOOK T1 - Erosion at inception of deep-sea channels AN - 1637541778; 2014-102007 JF - Internal architecture, bedforms and geometry of turbidite channels AU - Fildani, Andrea AU - Covault, Jacob A AU - Maier, Katherine L AU - Hubbard, Stephen M AU - Romans, Brian W AU - Rowland, Joel C AU - Mayall, Mike AU - Kane, Ian AU - McCaffrey, Bill Y1 - 2011 PY - 2011 DA - 2011 PB - Geological Society of London, London KW - United States KW - Northeast Pacific KW - erosion KW - mapping KW - deep-sea environment KW - Chile KW - observations KW - California KW - southern Chile KW - outcrops KW - ocean floors KW - East Pacific KW - high-resolution methods KW - patterns KW - Central California KW - geophysical methods KW - Tres Pasos Formation KW - reflection methods KW - seismic methods KW - models KW - levees KW - submarine canyons KW - South America KW - North Pacific KW - marine environment KW - Pacific Ocean KW - bathymetry KW - 20:Applied geophysics KW - 07:Oceanography UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637541778?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/GeoRef&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=book&rft.jtitle=&rft.atitle=&rft.au=Fildani%2C+Andrea%3BCovault%2C+Jacob+A%3BMaier%2C+Katherine+L%3BHubbard%2C+Stephen+M%3BRomans%2C+Brian+W%3BRowland%2C+Joel+C%3BMayall%2C+Mike%3BKane%2C+Ian%3BMcCaffrey%2C+Bill&rft.aulast=Fildani&rft.aufirst=Andrea&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=Erosion+at+inception+of+deep-sea+channels&rft.title=Erosion+at+inception+of+deep-sea+channels&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Internal architecture, bedforms and geometry of turbidite channels N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Last updated - 2014-12-18 ER - TY - JOUR T1 - Infrasonic observations from the February 21, 2008 Wells earthquake AN - 1524612129; 2014-032877 JF - Special Publication - Nevada Bureau of Mines and Geology AU - Burlacu, Relu AU - Arrowsmith, Stephen AU - Hayward, Chris AU - Stump, Brian Y1 - 2011 PY - 2011 DA - 2011 SP - 173 EP - 180 PB - Nevada Bureau of Mines and Geology, Reno, NV SN - 0275-6285, 0275-6285 KW - United States KW - Wells earthquake 2008 KW - monitoring KW - elastic waves KW - frequency KW - observations KW - measurement KW - infrasonic signals KW - northeastern Nevada KW - propagation KW - epicenters KW - seismic waves KW - earthquakes KW - Nevada KW - arrays KW - acoustical waves KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1524612129?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Special+Publication+-+Nevada+Bureau+of+Mines+and+Geology&rft.atitle=Infrasonic+observations+from+the+February+21%2C+2008+Wells+earthquake&rft.au=Burlacu%2C+Relu%3BArrowsmith%2C+Stephen%3BHayward%2C+Chris%3BStump%2C+Brian&rft.aulast=Burlacu&rft.aufirst=Relu&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=173&rft.isbn=&rft.btitle=&rft.title=Special+Publication+-+Nevada+Bureau+of+Mines+and+Geology&rft.issn=02756285&rft_id=info:doi/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2017, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 13 N1 - PubXState - NV N1 - Document feature - illus. incl. 2 tables, sketch map N1 - SuppNotes - Accessed on Oct. 7, 2013 N1 - Last updated - 2017-01-19 N1 - SubjectsTermNotLitGenreText - acoustical waves; arrays; earthquakes; elastic waves; epicenters; frequency; infrasonic signals; measurement; monitoring; Nevada; northeastern Nevada; observations; propagation; seismic waves; United States; Wells earthquake 2008 ER - TY - JOUR T1 - Graphs in Libraries: A Primer AN - 1448990736; 201310541 AB - Whenever librarians use Semantic Web services and standards for representing data, they also generate graphs, whether they intend to or not. Graphs are a new data model for libraries and librarians, and they present new opportunities for library services. In this paper we introduce graph theory and explore its real and potential applications in the context of digital libraries. Part 1 describes basic concepts in graph theory and how graph theory has been applied by information retrieval systems such as Google. Part 2 discusses practical applications of graph theory in digital library environments. Some of the applications have been prototyped at the Los Alamos National Laboratory Research Library, others have been described in peer-reviewed journals, and still others are speculative in nature. The paper is intended to serve as a high-level tutorial to graphs in libraries. Adapted from the source document. JF - Information Technology and Libraries AU - Powell, James E AU - Alcazar, Daniel A AU - Hopkins, Matthew AU - McMahon, Tamara M AU - Wu, Amber AU - Collins, Linn AU - Olendorf, Robert AD - Los Alamos National Laboratory, Los Alamos, New Mexico jepowell@lanl.gov Y1 - 2011///0, PY - 2011 DA - 0, 2011 SP - 157 EP - 169 PB - American Library Association, Chicago IL VL - 30 IS - 4 SN - 0730-9295, 0730-9295 KW - Information retrieval KW - Libraries KW - Theories KW - Graphs KW - Digital libraries KW - article KW - 13.0: COMPUTERIZED INFORMATION STORAGE AND RETRIEVAL UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1448990736?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Information+Technology+and+Libraries&rft.atitle=Graphs+in+Libraries%3A+A+Primer&rft.au=Powell%2C+James+E%3BAlcazar%2C+Daniel+A%3BHopkins%2C+Matthew%3BMcMahon%2C+Tamara+M%3BWu%2C+Amber%3BCollins%2C+Linn%3BOlendorf%2C+Robert&rft.aulast=Powell&rft.aufirst=James&rft.date=2011-01-01&rft.volume=30&rft.issue=4&rft.spage=157&rft.isbn=&rft.btitle=&rft.title=Information+Technology+and+Libraries&rft.issn=07309295&rft_id=info:doi/ LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2013-11-01 N1 - Last updated - 2016-09-27 N1 - SubjectsTermNotLitGenreText - Information retrieval; Theories; Graphs; Libraries; Digital libraries ER - TY - JOUR T1 - Buckman wellfield and its relation to groundwater beneath Los Alamos National Laboratory AN - 1244694456; 2013-008207 JF - Open File Report (Socorro, N.M.) AU - Vesselinov, Velimir V AU - Katzman, Danny AU - Broxton, David Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 24 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - pumping KW - New Mexico KW - Los Alamos County New Mexico KW - water balance KW - preferential flow KW - Los Alamos National Laboratory KW - ground water KW - aquifers KW - hydrostratigraphy KW - Buckman well field KW - discharge KW - water wells KW - faults KW - Espanola Basin KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244694456?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Buckman+wellfield+and+its+relation+to+groundwater+beneath+Los+Alamos+National+Laboratory&rft.au=Vesselinov%2C+Velimir+V%3BKatzman%2C+Danny%3BBroxton%2C+David&rft.aulast=Vesselinov&rft.aufirst=Velimir&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=24&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2013-04-19 N1 - SubjectsTermNotLitGenreText - aquifers; Buckman well field; discharge; Espanola Basin; faults; ground water; hydrostratigraphy; Los Alamos County New Mexico; Los Alamos National Laboratory; New Mexico; preferential flow; pumping; United States; water balance; water wells ER - TY - JOUR T1 - Use of congener homologs to evaluate PCBs in the Rio Grande near Los Alamos National Laboratory, New Mexico AN - 1244694389; 2013-008205 JF - Open File Report (Socorro, N.M.) AU - Reneau, Steven L AU - Drakos, Paul G AU - Schultz-Fellenz, Emily S Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 21 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - chlorinated hydrocarbons KW - stream sediments KW - PCBs KW - New Mexico KW - Los Alamos County New Mexico KW - variations KW - sediments KW - drainage basins KW - halogenated hydrocarbons KW - congeners KW - Rio Grande KW - pollutants KW - surface water KW - pollution KW - Los Alamos National Laboratory KW - models KW - provenance KW - organic compounds KW - runoff KW - risk assessment KW - homologs KW - fluvial environment KW - public health KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244694389?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Use+of+congener+homologs+to+evaluate+PCBs+in+the+Rio+Grande+near+Los+Alamos+National+Laboratory%2C+New+Mexico&rft.au=Reneau%2C+Steven+L%3BDrakos%2C+Paul+G%3BSchultz-Fellenz%2C+Emily+S&rft.aulast=Reneau&rft.aufirst=Steven&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=21&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - chlorinated hydrocarbons; congeners; drainage basins; fluvial environment; halogenated hydrocarbons; homologs; Los Alamos County New Mexico; Los Alamos National Laboratory; models; New Mexico; organic compounds; PCBs; pollutants; pollution; provenance; public health; Rio Grande; risk assessment; runoff; sediments; stream sediments; surface water; United States; variations ER - TY - JOUR T1 - Watershed-scale investigation of sediment contamination; chromium and PCBs in Sandia Canyon, Pajarito Plateau, New Mexico AN - 1244694341; 2013-008204 JF - Open File Report (Socorro, N.M.) AU - Reneau, Steven L AU - Drakos, Paul G AU - Riesterer, James W AU - Goetze, Phillip R AU - Schultz-Fellenz, Emily S AU - Miller, Elizabeth D AU - Katzman, Danny Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 20 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - Rio Grande KW - hydrology KW - chlorinated hydrocarbons KW - pollutants KW - PCBs KW - Pajarito Plateau KW - watersheds KW - pollution KW - Sandia Canyon KW - New Mexico KW - Los Alamos County New Mexico KW - Los Alamos National Laboratory KW - organic compounds KW - transport KW - metals KW - sediments KW - drainage basins KW - halogenated hydrocarbons KW - chromium KW - 02C:Geochemistry of rocks, soils, and sediments KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244694341?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Watershed-scale+investigation+of+sediment+contamination%3B+chromium+and+PCBs+in+Sandia+Canyon%2C+Pajarito+Plateau%2C+New+Mexico&rft.au=Reneau%2C+Steven+L%3BDrakos%2C+Paul+G%3BRiesterer%2C+James+W%3BGoetze%2C+Phillip+R%3BSchultz-Fellenz%2C+Emily+S%3BMiller%2C+Elizabeth+D%3BKatzman%2C+Danny&rft.aulast=Reneau&rft.aufirst=Steven&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=20&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - chlorinated hydrocarbons; chromium; drainage basins; halogenated hydrocarbons; hydrology; Los Alamos County New Mexico; Los Alamos National Laboratory; metals; New Mexico; organic compounds; Pajarito Plateau; PCBs; pollutants; pollution; Rio Grande; Sandia Canyon; sediments; transport; United States; watersheds ER - TY - JOUR T1 - Differentiation among multiple sources of anthropogenic nitrate in Mortandad Canyon, Pajarito Plateau, using dual stable isotope systematics AN - 1244694301; 2013-008203 JF - Open File Report (Socorro, N.M.) AU - Perkins, George B AU - Larson, Toti E AU - Longmire, Patrick A AU - Heikoop, Jeffrey M AU - Fessenden-Rahn, Julianna AU - Rearick, Michael S AU - Fabryka-Martin, June T AU - Chrystal, Abbey E AU - Dale, Michael AU - Simmons, Ardyth M Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 19 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - hydrology KW - N-15/N-14 KW - oxygen KW - isotopes KW - pollutants KW - isotope ratios KW - Mortandad Canyon KW - Pajarito Plateau KW - watersheds KW - pollution KW - O-18/O-16 KW - New Mexico KW - stable isotopes KW - nitrogen KW - ground water KW - aquifers KW - provenance KW - nitrate ion KW - water pollution KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244694301?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Differentiation+among+multiple+sources+of+anthropogenic+nitrate+in+Mortandad+Canyon%2C+Pajarito+Plateau%2C+using+dual+stable+isotope+systematics&rft.au=Perkins%2C+George+B%3BLarson%2C+Toti+E%3BLongmire%2C+Patrick+A%3BHeikoop%2C+Jeffrey+M%3BFessenden-Rahn%2C+Julianna%3BRearick%2C+Michael+S%3BFabryka-Martin%2C+June+T%3BChrystal%2C+Abbey+E%3BDale%2C+Michael%3BSimmons%2C+Ardyth+M&rft.aulast=Perkins&rft.aufirst=George&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=19&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - aquifers; ground water; hydrology; isotope ratios; isotopes; Mortandad Canyon; N-15/N-14; New Mexico; nitrate ion; nitrogen; O-18/O-16; oxygen; Pajarito Plateau; pollutants; pollution; provenance; stable isotopes; United States; water pollution; watersheds ER - TY - JOUR T1 - Climate effects on oxygen isotope recharge elevation calculations from the Sierra de Los Valles and the Pajarito Plateau AN - 1244694172; 2013-008195 JF - Open File Report (Socorro, N.M.) AU - Heikoop, Jeffrey M AU - Longmire, Patrick A AU - Dale, Michael AU - Chrystal, Abbey E Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 8 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - Quaternary KW - oxygen KW - isotopes KW - isotope ratios KW - elevation KW - Pajarito Plateau KW - O-18/O-16 KW - New Mexico KW - Sierra de Los Valles KW - paleoclimatology KW - hydrochemistry KW - Holocene KW - stable isotopes KW - temperature KW - ground water KW - aquifers KW - Cenozoic KW - recharge KW - geochemistry KW - climate KW - 21:Hydrogeology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244694172?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Climate+effects+on+oxygen+isotope+recharge+elevation+calculations+from+the+Sierra+de+Los+Valles+and+the+Pajarito+Plateau&rft.au=Heikoop%2C+Jeffrey+M%3BLongmire%2C+Patrick+A%3BDale%2C+Michael%3BChrystal%2C+Abbey+E&rft.aulast=Heikoop&rft.aufirst=Jeffrey&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=8&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - aquifers; Cenozoic; climate; elevation; geochemistry; ground water; Holocene; hydrochemistry; isotope ratios; isotopes; New Mexico; O-18/O-16; oxygen; Pajarito Plateau; paleoclimatology; Quaternary; recharge; Sierra de Los Valles; stable isotopes; temperature; United States ER - TY - JOUR T1 - Application of the sitewide Geologic Framework Model to MDA-T and MDA-G at Los Alamos National Laboratory AN - 1244694120; 2013-008193 JF - Open File Report (Socorro, N.M.) AU - Coblentz, David AU - Cole, Greg AU - Jacobs, Elaine P Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 5 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - ArcGIS KW - Pajarito Plateau KW - New Mexico KW - Los Alamos County New Mexico KW - ArcInfo KW - Los Alamos National Laboratory KW - areal geology KW - models KW - Geologic Framework Model KW - geographic information systems KW - information systems KW - EarthVision KW - applications KW - 13:Areal geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244694120?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Application+of+the+sitewide+Geologic+Framework+Model+to+MDA-T+and+MDA-G+at+Los+Alamos+National+Laboratory&rft.au=Coblentz%2C+David%3BCole%2C+Greg%3BJacobs%2C+Elaine+P&rft.aulast=Coblentz&rft.aufirst=David&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=5&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - applications; ArcGIS; ArcInfo; areal geology; EarthVision; geographic information systems; Geologic Framework Model; information systems; Los Alamos County New Mexico; Los Alamos National Laboratory; models; New Mexico; Pajarito Plateau; United States ER - TY - JOUR T1 - Isotopic composition of natural nitrate in groundwater in Los Alamos, New Mexico AN - 1244694090; 2013-008192 JF - Open File Report (Socorro, N.M.) AU - Chrystal, Abbey E AU - Heikoop, Jeffrey M AU - Longmire, Patrick A AU - Dale, Michael AU - Larson, Toti E AU - Perkins, George B AU - Fabryka-Martin, June T AU - Simmons, Ardyth M AU - Fessenden-Rahn, Julianna Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 4 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - soils KW - N-15/N-14 KW - oxygen KW - isotopes KW - pollutants KW - isotope ratios KW - unsaturated zone KW - pollution KW - O-18/O-16 KW - New Mexico KW - Los Alamos County New Mexico KW - stable isotopes KW - nitrogen KW - ground water KW - provenance KW - nitrate ion KW - pore water KW - 02D:Isotope geochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244694090?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Isotopic+composition+of+natural+nitrate+in+groundwater+in+Los+Alamos%2C+New+Mexico&rft.au=Chrystal%2C+Abbey+E%3BHeikoop%2C+Jeffrey+M%3BLongmire%2C+Patrick+A%3BDale%2C+Michael%3BLarson%2C+Toti+E%3BPerkins%2C+George+B%3BFabryka-Martin%2C+June+T%3BSimmons%2C+Ardyth+M%3BFessenden-Rahn%2C+Julianna&rft.aulast=Chrystal&rft.aufirst=Abbey&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=4&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - ground water; isotope ratios; isotopes; Los Alamos County New Mexico; N-15/N-14; New Mexico; nitrate ion; nitrogen; O-18/O-16; oxygen; pollutants; pollution; pore water; provenance; soils; stable isotopes; United States; unsaturated zone ER - TY - JOUR T1 - Private domestic well testing in the Santa Fe region AN - 1244683013; 2013-008200 JF - Open File Report (Socorro, N.M.) AU - McQuillan, Dennis AU - Linhoff, Benjamin AU - Longmire, Patrick A AU - Rearick, Michael S AU - Gallegos, Robert AU - Torres, Karen AU - Wiman, Stephen AU - Sanchez, Melanie AU - King, Amanda Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 16 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - concentration KW - pollution KW - New Mexico KW - hydrochemistry KW - environmental analysis KW - ground water KW - nutrients KW - metals KW - Santa Fe County New Mexico KW - risk assessment KW - nitrate ion KW - water wells KW - water pollution KW - geochemistry KW - public health KW - 02B:Hydrochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244683013?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Private+domestic+well+testing+in+the+Santa+Fe+region&rft.au=McQuillan%2C+Dennis%3BLinhoff%2C+Benjamin%3BLongmire%2C+Patrick+A%3BRearick%2C+Michael+S%3BGallegos%2C+Robert%3BTorres%2C+Karen%3BWiman%2C+Stephen%3BSanchez%2C+Melanie%3BKing%2C+Amanda&rft.aulast=McQuillan&rft.aufirst=Dennis&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=16&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - concentration; environmental analysis; geochemistry; ground water; hydrochemistry; metals; New Mexico; nitrate ion; nutrients; pollution; public health; risk assessment; Santa Fe County New Mexico; United States; water pollution; water wells ER - TY - JOUR T1 - Aqueous geochemistry and environmental fate of uranium in the Espanola Basin, New Mexico AN - 1244682977; 2013-008199 JF - Open File Report (Socorro, N.M.) AU - Linhoff, Benjamin AU - Longmire, Patrick A AU - Rearick, Michael S AU - Perkins, George B AU - Wiman, Stephen AU - Siegel, Malcolm AU - McQuillan, Dennis Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 15 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - oxygen KW - isotopes KW - pollutants KW - isotope ratios KW - pollution KW - O-18/O-16 KW - New Mexico KW - Los Alamos County New Mexico KW - Los Alamos National Laboratory KW - hydrochemistry KW - stable isotopes KW - ground water KW - aquifers KW - transport KW - D/H KW - metals KW - hydrogen KW - uranium KW - geochemistry KW - actinides KW - Espanola Basin KW - 02B:Hydrochemistry KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244682977?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=Aqueous+geochemistry+and+environmental+fate+of+uranium+in+the+Espanola+Basin%2C+New+Mexico&rft.au=Linhoff%2C+Benjamin%3BLongmire%2C+Patrick+A%3BRearick%2C+Michael+S%3BPerkins%2C+George+B%3BWiman%2C+Stephen%3BSiegel%2C+Malcolm%3BMcQuillan%2C+Dennis&rft.aulast=Linhoff&rft.aufirst=Benjamin&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=15&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - actinides; aquifers; D/H; Espanola Basin; geochemistry; ground water; hydrochemistry; hydrogen; isotope ratios; isotopes; Los Alamos County New Mexico; Los Alamos National Laboratory; metals; New Mexico; O-18/O-16; oxygen; pollutants; pollution; stable isotopes; transport; United States; uranium ER - TY - JOUR T1 - An integrated approach to mitigating sediment transport in the Los Alamos/Pueblo Canyon watershed AN - 1244682904; 2013-008197 JF - Open File Report (Socorro, N.M.) AU - Katzman, Danny AU - Veenis, Steve J AU - Reneau, Steven L AU - Kuyumjian, Greg AU - Werdel, Nancy AU - Rodriguez, Cheryl Y1 - 2011/01// PY - 2011 DA - January 2011 SP - 12 PB - New Mexico Bureau of Geology and Mineral Resources, Socorro, NM SN - 0731-5066, 0731-5066 KW - United States KW - hydrology KW - chlorinated hydrocarbons KW - water quality KW - Pueblo Canyon KW - sediment transport KW - pollutants KW - surface water KW - PCBs KW - watersheds KW - pollution KW - New Mexico KW - canyons KW - urban environment KW - organic compounds KW - mitigation KW - transport KW - runoff KW - drainage basins KW - halogenated hydrocarbons KW - Los Alamos Basin KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244682904?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Open+File+Report+%28Socorro%2C+N.M.%29&rft.atitle=An+integrated+approach+to+mitigating+sediment+transport+in+the+Los+Alamos%2FPueblo+Canyon+watershed&rft.au=Katzman%2C+Danny%3BVeenis%2C+Steve+J%3BReneau%2C+Steven+L%3BKuyumjian%2C+Greg%3BWerdel%2C+Nancy%3BRodriguez%2C+Cheryl&rft.aulast=Katzman&rft.aufirst=Danny&rft.date=2011-01-01&rft.volume=&rft.issue=&rft.spage=12&rft.isbn=&rft.btitle=&rft.title=Open+File+Report+%28Socorro%2C+N.M.%29&rft.issn=07315066&rft_id=info:doi/ L2 - http://geoinfo.nmt.edu/publications/openfile/details.cfml?Volume=536 LA - English DB - GeoRef N1 - Conference title - 9th annual Espanola Basin workshop; Watersheds and surface water of the Espanola Basin N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - PubXState - NM N1 - SuppNotes - Accessed on Sept. 12, 2012 N1 - Last updated - 2012-12-27 N1 - SubjectsTermNotLitGenreText - canyons; chlorinated hydrocarbons; drainage basins; halogenated hydrocarbons; hydrology; Los Alamos Basin; mitigation; New Mexico; organic compounds; PCBs; pollutants; pollution; Pueblo Canyon; runoff; sediment transport; surface water; transport; United States; urban environment; water quality; watersheds ER - TY - JOUR T1 - W-Os isotope systematics in IVB iron meteorites AN - 1151910310; 2012-096736 AB - (super 182) Hf- (super 182) W dating implies contemporaneous condensation of the earliest solar system solids (CAIs) and magmatic differentiation of planetesimals (i.e., iron meteorite groups) [1]. IVB iron meteorites exhibit epsilon (super 182) W (-3.56+ or -0.1) lower than CAIs (epsilon (super 182) W -3.28+ or -0.2). The initial W isotope signature of CAIs may have been reset by metamorphism of chondrites [2] while IVB irons need to be corrected for thermal neutron capture due to galactic cosmic ray (GCR) exposure. Although GCR corrections have become more sophisticated, determining the true (super 182) W deficit remains problematic [3]. Using Os isotopes as in situ neutron dosimeters [4], we re-evaluated the degree of GCR modification of epsilon (super 182) W. Our IVB epsilon (super 182) W data is derived from a more complete sampling of the IVB group (including Iquique, Weaver, Kokomo), but using smaller samples than [4-5]. MC-ICP-MS measurements (NEPTUNETM) of W isotopes were performed on 10-20 ng aliquots using an ApexTM introduction system and Jet Ni sampler and X skimmer cones. The reproducibility of epsilon (super 182) W for NIST SRM 3163 is + or -0.14e (2s,n=142) and + or -0.32epsilon (2s, n=19, 10-25 ng) if a smaller, random standard population is considered to capture the analytical uncertainty expected from our IVB set. Since Tlacotepec has systematically lower epsilon (super 182) W, the average epsilon (super 182) W (-3.31+ or -0.22, 2s) of IVBs is calculated for n=9 samples, excluding Tlacotepec. Our IVB average epsilon (super 182) W is more radiogenic than previously reported [1-3,5-6] but with larger analytical uncertainty. Importantly, our epsilon e (super 182) W IVB average is identical to the most recent CAI value epsilon [1]. By using Tlacotepec with its large GCR-induced (super 182) W- (super 190) Os shift as an anchor point, the Os-W isotope data of this group can be projected towards epsilon (super 190) Os of 0 [4] to yield a pre-irradiation e (super 182) W of -2.95. This epsilon (super 182) W allows for approximately 4 Myr of accretion and planetesimal differentiation for IVBs and reconciles current models of solar system formation with the W isotope record. A follow-up higher-precision W-Os isotope study from the same digestions is underway. JF - Mineralogical Magazine AU - Wittig, N AU - Humayun, M AU - Anonymous Y1 - 2011 PY - 2011 DA - 2011 SP - 2168 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - isotopes KW - mass spectra KW - cosmogenic elements KW - planetesimals KW - platinum group KW - stable isotopes KW - Kokomo Meteorite KW - meteorites KW - laboratory studies KW - multicollector methods KW - tungsten KW - iron meteorites KW - Tlacotepec Meteorite KW - absolute age KW - spectra KW - geochemistry KW - solar system KW - experimental studies KW - Hf/W KW - Os-190 KW - cosmochemistry KW - W-182 KW - Iquique Meteorite KW - ICP mass spectra KW - sample preparation KW - metals KW - osmium KW - Weaver Meteorite KW - instruments KW - 05B:Petrology of meteorites and tektites KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151910310?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=W-Os+isotope+systematics+in+IVB+iron+meteorites&rft.au=Wittig%2C+N%3BHumayun%2C+M%3BAnonymous&rft.aulast=Wittig&rft.aufirst=N&rft.date=2011-01-01&rft.volume=75&rft.issue=3&rft.spage=2168&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/2106.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Number of references - 6 N1 - Last updated - 2012-11-15 N1 - SubjectsTermNotLitGenreText - absolute age; cosmochemistry; cosmogenic elements; experimental studies; geochemistry; Hf/W; ICP mass spectra; instruments; Iquique Meteorite; iron meteorites; isotopes; Kokomo Meteorite; laboratory studies; mass spectra; metals; meteorites; multicollector methods; Os-190; osmium; planetesimals; platinum group; sample preparation; solar system; spectra; stable isotopes; Tlacotepec Meteorite; tungsten; W-182; Weaver Meteorite ER - TY - JOUR T1 - Petroleomics; past, present and future AN - 1112670120; 2012-091331 AB - Advances in mass spectrometry enable identification of tens of thousands of species in petroleum and environmental samples at the molecular level (elemental composition assignment). Current ionization methods amplify the utility of such detailed compositional information through the selective ionization of basic, acidic and aromatic species (+ or - ESI and APPI). The ability to fingerprint, identify and track compositional changes in complex natural mixtures spawned the field of 'Petroleomics'. Although the past and current applications are largely limited to high resolution Fourier transform ion cyclotron resonance mass spectrometry, the future of 'Petroleomics' lies in the expansion and method development on the latest instruments in all areas of analytical chemistry. Here we present an overview of the birth and development of Petroleomics and highlight the latest developments in our 'petroleomic' research efforts with an emphasis on the diversification of analytical workflows to maximize attainable compositional information. Specifically, microdistillation, 2-D HPLC, GC x GC, LC-TOF, preparative scale LC and FT-ICR MS will be discussed. Geochemical, oil production and refinery applications that include down-hole, deposits, offshore platform, terrestrial production and distillate samples reveal the need for a diversified analytical approach combined with high field FT-ICR mass spectrometry for problem solving and advances in the fundamental knowledge of the composition and behavior of petroleum derived materials. JF - Mineralogical Magazine AU - Rodgers, Ryan P AU - McKenna, Amy M AU - Hendrickson, Chrisopher L AU - Marshall, Alan G AU - Anonymous Y1 - 2011 PY - 2011 DA - 2011 SP - 1739 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - offshore KW - mass spectra KW - petroleum KW - Fourier transform ion cyclotron resonance mass spectra KW - onshore KW - research KW - FTICR spectra KW - two-dimensional models KW - molecular structure KW - petroleomics KW - spectra KW - geochemistry KW - review KW - 29A:Economic geology, geology of energy sources KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1112670120?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Petroleomics%3B+past%2C+present+and+future&rft.au=Rodgers%2C+Ryan+P%3BMcKenna%2C+Amy+M%3BHendrickson%2C+Chrisopher+L%3BMarshall%2C+Alan+G%3BAnonymous&rft.aulast=Rodgers&rft.aufirst=Ryan&rft.date=2011-01-01&rft.volume=75&rft.issue=3&rft.spage=1739&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/1685.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Last updated - 2012-10-18 N1 - SubjectsTermNotLitGenreText - Fourier transform ion cyclotron resonance mass spectra; FTICR spectra; geochemistry; mass spectra; molecular structure; offshore; onshore; petroleomics; petroleum; research; review; spectra; two-dimensional models ER - TY - JOUR T1 - Links between acceleration, melting, and supraglacial lake drainage of the western Greenland ice sheet AN - 1080607712; 2012-083341 AB - The impact of increasing summer melt on the dynamics and stability of the Greenland Ice Sheet is not fully understood. Mounting evidence suggests seasonal evolution of subglacial drainage mitigates or counteracts the ability of surface runoff to increase basal sliding. Here, we compare subdaily ice velocity and uplift derived from nine Global Positioning System stations in the upper ablation zone in west Greenland to surface melt and supraglacial lake drainage during summer 2007. Starting around day 173, we observe speedups of 6-41% above spring velocity lasting approximately 40 days accompanied by sustained surface uplift at most stations, followed by a late summer slowdown. After initial speedup, we see a spatially uniform velocity response across the ablation zone and strong diurnal velocity variations during periods of melting. Most lake drainages were undetectable in the velocity record, and those that were detected only perturbed velocities for approximately 1 day, suggesting preexisting drainage systems could efficiently drain large volumes of water. The dynamic response to melt forcing appears to (1) be driven by changes in subglacial storage of water that is delivered in diurnal and episodic pulses, and (2) decrease over the course of the summer, presumably as the subglacial drainage system evolves to greater efficiency. The relationship between hydrology and ice dynamics observed is similar to that observed on mountain glaciers, suggesting that seasonally large water pressures under the ice sheet largely compensate for the greater ice thickness considered here. Thus, increases in summer melting may not guarantee faster seasonal ice flow. JF - Journal of Geophysical Research AU - Hoffman, M J AU - Catania, G A AU - Neumann, T A AU - Andrews, L C AU - Rumrill, J A Y1 - 2011 PY - 2011 DA - 2011 EP - Citation F04035 PB - American Geophysical Union, Washington, DC VL - 116 IS - F4 SN - 0148-0227, 0148-0227 KW - hydrology KW - Arctic region KW - lakes KW - Greenland ice sheet KW - West Greenland KW - ice cover KW - glaciers KW - glacial features KW - satellite methods KW - ice sheets KW - temperature KW - ice movement KW - Greenland KW - melting KW - ice KW - glacial geology KW - remote sensing KW - meltwater KW - ice cover distribution KW - glacial lakes KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080607712?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Links+between+acceleration%2C+melting%2C+and+supraglacial+lake+drainage+of+the+western+Greenland+ice+sheet&rft.au=Hoffman%2C+M+J%3BCatania%2C+G+A%3BNeumann%2C+T+A%3BAndrews%2C+L+C%3BRumrill%2C+J+A&rft.aulast=Hoffman&rft.aufirst=M&rft.date=2011-01-01&rft.volume=116&rft.issue=F4&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2010JF001934 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 45 N1 - PubXState - DC N1 - Document feature - illus. incl. 3 tables, geol. sketch map N1 - Last updated - 2012-09-27 N1 - SubjectsTermNotLitGenreText - Arctic region; glacial features; glacial geology; glacial lakes; glaciers; Greenland; Greenland ice sheet; hydrology; ice; ice cover; ice cover distribution; ice movement; ice sheets; lakes; melting; meltwater; remote sensing; satellite methods; temperature; West Greenland DO - http://dx.doi.org/10.1029/2010JF001934 ER - TY - JOUR T1 - Dynamic patterns of ice stream flow in a 3-D higher-order ice sheet model with plastic bed and simplified hydrology AN - 1080607534; 2012-083327 AB - Predicting ice sheet mass balance is challenging because of the complex flow of ice streams. To address this issue, we have coupled a three-dimensional higher-order ice sheet model to a basal processes model where subglacial till has a plastic rheology and evolving yield stress. The model was tested for its sensitivity to regional water availability. First, with an assumed undrained bed, the ice stream oscillates between active and stagnant phases, solely as a result of thermodynamic feedbacks occurring at the ice-till interface. However, the velocity amplitude decreases over time, as insufficient basal meltwater causes the ice stream to gradually thicken and enter a slow flowing "ice sheet mode." Second, we assume that the till is able to assimilate water from a hypothetical regional hydrological system. This leads to significantly different long-term behavior, as a continuously oscillating "ice stream mode" is maintained. The extra water incorporated in the till leads to higher velocities, triggering stronger thermodynamic feedbacks between the ice and till layer. Results also suggest that fast-flowing ice streams may be modulated by till properties as a result of the duration of thermal conditions during the preceding stagnant phase. Similarly, till properties beneath stagnant ice streams are influenced by basal conditions during the preceding fast flow phase. Our findings support the inference that ice streams are strongly influenced by the presence of a regional hydrological system, underscoring the need to accurately describe the coupling between ice dynamics, basal conditions and regional subglacial hydrology in ice sheet models. JF - Journal of Geophysical Research AU - Bougamont, M AU - Price, S AU - Christoffersen, P AU - Payne, A J Y1 - 2011 PY - 2011 DA - 2011 EP - Citation F04018 PB - American Geophysical Union, Washington, DC VL - 116 IS - F4 SN - 0148-0227, 0148-0227 KW - hydrology KW - subglacial environment KW - three-dimensional models KW - subglacial processes KW - Kamb ice stream KW - ice sheets KW - Antarctic ice sheet KW - ice movement KW - Antarctica KW - ice streams KW - Whillans ice stream KW - West Antarctic ice sheet KW - glacial geology KW - plasticity KW - Siple Coast KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080607534?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research&rft.atitle=Dynamic+patterns+of+ice+stream+flow+in+a+3-D+higher-order+ice+sheet+model+with+plastic+bed+and+simplified+hydrology&rft.au=Bougamont%2C+M%3BPrice%2C+S%3BChristoffersen%2C+P%3BPayne%2C+A+J&rft.aulast=Bougamont&rft.aufirst=M&rft.date=2011-01-01&rft.volume=116&rft.issue=F4&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research&rft.issn=01480227&rft_id=info:doi/10.1029%2F2011JF002025 L2 - http://www.agu.org/journals/jgr/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 40 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2012-09-27 N1 - SubjectsTermNotLitGenreText - Antarctic ice sheet; Antarctica; glacial geology; hydrology; ice movement; ice sheets; ice streams; Kamb ice stream; plasticity; Siple Coast; subglacial environment; subglacial processes; three-dimensional models; West Antarctic ice sheet; Whillans ice stream DO - http://dx.doi.org/10.1029/2011JF002025 ER - TY - JOUR T1 - Primary and secondary water content heterogeneity in volcanic glasses AN - 1033531070; 2012-072641 AB - Spatial heterogeneities in the dissolved water content within volcanic glasses are generated by diffusive degassing and crystallization of melts, as well as subsequent post-eruptive hydration of quenched glasses. Characterization of the resultant water diffusion gradients using micro-analytical techniques such as SIMS or synchrotron FTIR allows us to model the timescale of water diffusion and thus key pre-, syn- and post-eruptive processes. We present a variety of micro-analytical data to illustrate three sources of water content heterogeneity within rhyolitic glasses. Firstly, enrichment of water in glass surrounding spherulites reflects its expulsion during growth of anhydrous mineral phases. Our diffusion models have placed new constraints on spherulite growth rates within obsidian flows [1]. Secondly, we have found strong water enrichment adjacent to perlitic fractures in subglacially erupted obsidian lavas [2]. Diffusion and cooling models show that perlitization starts at approximately 400 degrees C and occurs over timescale of days [3]. Finally, we have used SIMS analysis to overcome the hydration problem and successfully measure the dissolved magmatic water content of pumices [4]. This provides new insight into magma storage and degassing prior to an exceptionally violent eruption. JF - Mineralogical Magazine AU - Tuffen, H AU - Castro, J M AU - Owen, J AU - Denton, J S AU - Anonymous Y1 - 2011 PY - 2011 DA - 2011 SP - 2038 PB - Mineralogical Society, London VL - 75 IS - 3 SN - 0026-461X, 0026-461X KW - experimental studies KW - diffusion KW - rhyolites KW - volcanic rocks KW - ion probe data KW - glasses KW - igneous rocks KW - perlite KW - mass spectra KW - explosive eruptions KW - models KW - pyroclastics KW - volcanic glass KW - volcanism KW - magmas KW - eruptions KW - spherulites KW - pumice KW - water content KW - spectra KW - heterogeneity KW - degassing KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1033531070?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Mineralogical+Magazine&rft.atitle=Primary+and+secondary+water+content+heterogeneity+in+volcanic+glasses&rft.au=Tuffen%2C+H%3BCastro%2C+J+M%3BOwen%2C+J%3BDenton%2C+J+S%3BAnonymous&rft.aulast=Tuffen&rft.aufirst=H&rft.date=2011-01-01&rft.volume=75&rft.issue=3&rft.spage=2038&rft.isbn=&rft.btitle=&rft.title=Mineralogical+Magazine&rft.issn=0026461X&rft_id=info:doi/ L2 - http://minmag.geoscienceworld.org/content/75/3/1979.full.pdf+html http://www.minersoc.org/pages/e_journals/minmag.html LA - English DB - GeoRef N1 - Conference title - Goldschmidt2011 N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland N1 - Date revised - 2012-01-01 N1 - Number of references - 4 N1 - Last updated - 2012-08-16 N1 - SubjectsTermNotLitGenreText - degassing; diffusion; eruptions; experimental studies; explosive eruptions; glasses; heterogeneity; igneous rocks; ion probe data; magmas; mass spectra; models; perlite; pumice; pyroclastics; rhyolites; spectra; spherulites; volcanic glass; volcanic rocks; volcanism; water content ER - TY - JOUR T1 - Relative stability and significance of dawsonite and aluminum minerals in geologic carbon sequestration AN - 1008820663; 2012-040761 AB - Computer simulations predict dawsonite, NaAlCO (sub 3) (OH) (sub 2) , will provide long-term mineral sequestration of anthropogenic CO (sub 2) whereas dawsonite rarely occurs in nature or in laboratory experiments that emulate a carbon repository. Resolving this discrepancy is important to determining the significance of dawsonite mineralization to the long-term security of geologic carbon sequestration. This study is an equilibrium-based experimental and modeling evaluation of underlying causes for inconsistencies between predicted and observed dawsonite stability. Using established hydrothermal methods, 0.05 molal NaHCO (sub 3) aqueous solution and synthetic dawsonite were reacted for 18.7 days (449.2 hours) at 50 degrees C, 20 MPa. Temperature was increased to 75 degrees C and the experiment continued for an additional 12.3 days (295.1 hours). Incongruent dissolution yielded a dawsonite-gibbsite-nordstrandite assemblage. Geochemical simulations using Geochemist's Workbench and the resident database thermo.com.V8.R6 (super +) incorrectly predicted a dawsonite-diaspore assemblage and underestimated dissolved aluminum by roughly 100 times. Higher aqueous aluminum concentrations in the experiment suggest that dawsonite or diaspore is less stable than predicted. Simulations employing an alternate database, thermo.dat, correctly predict dawsonite and dawsonite-gibbsite assemblages at 50 and 75 degrees C, respectively, although dissolved aluminum concentrations are still two to three times lower than experimentally measured values. Correctly reproducing dawsonite solubility in standard geochemical simulations requires an as yet undeveloped internally consistent thermodynamic database among dawsonite, gibbsite, boehmite, diaspore, aqueous aluminum complexes and other Al-phases such as albite and kaolinite. These discrepancies question the ability of performance assessment models to correctly predict dawsonite mineralization in a sequestration site. JF - Geophysical Research Letters AU - Kaszuba, John P AU - Viswanathan, Hari S AU - Carey, J William Y1 - 2011 PY - 2011 DA - 2011 EP - Citation L08404 PB - American Geophysical Union, Washington, DC VL - 38 IS - 8 SN - 0094-8276, 0094-8276 KW - silicates KW - experimental studies KW - carbon sequestration KW - engineering properties KW - human activity KW - kaolinite KW - clay minerals KW - carbon dioxide KW - laboratory studies KW - water-rock interaction KW - metals KW - aluminum KW - mineralization KW - sheet silicates KW - reservoir properties KW - dawsonite KW - chemical composition KW - carbonates KW - 30:Engineering geology KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1008820663?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Relative+stability+and+significance+of+dawsonite+and+aluminum+minerals+in+geologic+carbon+sequestration&rft.au=Kaszuba%2C+John+P%3BViswanathan%2C+Hari+S%3BCarey%2C+J+William&rft.aulast=Kaszuba&rft.aufirst=John&rft.date=2011-01-01&rft.volume=38&rft.issue=8&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2011GL046845 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 40 N1 - PubXState - DC N1 - Document feature - illus. N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-06-07 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - aluminum; carbon dioxide; carbon sequestration; carbonates; chemical composition; clay minerals; dawsonite; engineering properties; experimental studies; human activity; kaolinite; laboratory studies; metals; mineralization; reservoir properties; sheet silicates; silicates; water-rock interaction DO - http://dx.doi.org/10.1029/2011GL046845 ER - TY - JOUR T1 - Laboratory testing and modeling to evaluate perfluorocarbon compounds as tracers in geothermal systems AN - 1008820119; 2012-039657 JF - Proceedings - Workshop on Geothermal Reservoir Engineering AU - Reimus, Paul W AU - Watson, Thomas AU - Vermeul, Vince AU - Newell, Dennis AU - Williams, Mark AU - Anonymous Y1 - 2011 PY - 2011 DA - 2011 PB - Stanford University, Stanford Geothermal Program, Stanford, CA VL - 191 SN - 1058-2525, 1058-2525 KW - experimental studies KW - thermal conductivity KW - geothermal wells KW - thermal properties KW - production KW - temperature KW - models KW - geothermal energy KW - laboratory studies KW - organic compounds KW - geothermal reservoirs KW - energy sources KW - heat flow KW - tracers KW - hydrocarbons KW - reservoir properties KW - hydraulic conductivity KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1008820119?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Proceedings+-+Workshop+on+Geothermal+Reservoir+Engineering&rft.atitle=Laboratory+testing+and+modeling+to+evaluate+perfluorocarbon+compounds+as+tracers+in+geothermal+systems&rft.au=Reimus%2C+Paul+W%3BWatson%2C+Thomas%3BVermeul%2C+Vince%3BNewell%2C+Dennis%3BWilliams%2C+Mark%3BAnonymous&rft.aulast=Reimus&rft.aufirst=Paul&rft.date=2011-01-01&rft.volume=191&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Proceedings+-+Workshop+on+Geothermal+Reservoir+Engineering&rft.issn=10582525&rft_id=info:doi/ L2 - http://pangea.stanford.edu/ERE/pdf/IGAstandard/SGW/2011/watson.pdf LA - English DB - GeoRef N1 - Conference title - 36th workshop on Geothermal reservoir engineering N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 11 N1 - PubXState - CA N1 - Document feature - illus. incl. 2 tables N1 - SuppNotes - Stanford Geothermal Program workshop report SGP-TR-191 N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - energy sources; experimental studies; geothermal energy; geothermal reservoirs; geothermal wells; heat flow; hydraulic conductivity; hydrocarbons; laboratory studies; models; organic compounds; production; reservoir properties; temperature; thermal conductivity; thermal properties; tracers ER - TY - JOUR T1 - Quantum dots as tracers in geothermal and EGS reservoirs AN - 1008820101; 2012-039655 JF - Proceedings - Workshop on Geothermal Reservoir Engineering AU - Rose, Peter AU - Riasetto, David AU - Siy, Jacqueline AU - Bartl, Michael AU - Reimus, Paul W AU - Mella, Michael AU - Leecaster, Kevin AU - Petty, Susan AU - Anonymous Y1 - 2011 PY - 2011 DA - 2011 PB - Stanford University, Stanford Geothermal Program, Stanford, CA VL - 191 SN - 1058-2525, 1058-2525 KW - hydraulic fracturing KW - colloidal materials KW - pressure KW - geothermal wells KW - enhanced recovery KW - temperature KW - geothermal energy KW - geothermal reservoirs KW - fluid injection KW - geothermal exploration KW - energy sources KW - tracers KW - chemical properties KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1008820101?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Proceedings+-+Workshop+on+Geothermal+Reservoir+Engineering&rft.atitle=Quantum+dots+as+tracers+in+geothermal+and+EGS+reservoirs&rft.au=Rose%2C+Peter%3BRiasetto%2C+David%3BSiy%2C+Jacqueline%3BBartl%2C+Michael%3BReimus%2C+Paul+W%3BMella%2C+Michael%3BLeecaster%2C+Kevin%3BPetty%2C+Susan%3BAnonymous&rft.aulast=Rose&rft.aufirst=Peter&rft.date=2011-01-01&rft.volume=191&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Proceedings+-+Workshop+on+Geothermal+Reservoir+Engineering&rft.issn=10582525&rft_id=info:doi/ L2 - http://pangea.stanford.edu/ERE/pdf/IGAstandard/SGW/2011/rose.pdf LA - English DB - GeoRef N1 - Conference title - 36th workshop on Geothermal reservoir engineering N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 10 N1 - PubXState - CA N1 - Document feature - illus. N1 - SuppNotes - Stanford Geothermal Program workshop report SGP-TR-191 N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - chemical properties; colloidal materials; energy sources; enhanced recovery; fluid injection; geothermal energy; geothermal exploration; geothermal reservoirs; geothermal wells; hydraulic fracturing; pressure; temperature; tracers ER - TY - JOUR T1 - Seismic and magneto-telluric imaging for geothermal exploration at Jemez Pueblo in New Mexico AN - 1008819983; 2012-039623 JF - Proceedings - Workshop on Geothermal Reservoir Engineering AU - Huang, Lianjie AU - Albrecht, Michael AU - Anonymous Y1 - 2011 PY - 2011 DA - 2011 PB - Stanford University, Stanford Geothermal Program, Stanford, CA VL - 191 SN - 1058-2525, 1058-2525 KW - United States KW - geophysical surveys KW - geothermal wells KW - well-logging KW - geophysical methods KW - New Mexico KW - seismic methods KW - magnetotelluric methods KW - geothermal energy KW - geothermal fields KW - geothermal reservoirs KW - geothermal exploration KW - energy sources KW - surveys KW - Jemez Mountains KW - drilling KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1008819983?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Proceedings+-+Workshop+on+Geothermal+Reservoir+Engineering&rft.atitle=Seismic+and+magneto-telluric+imaging+for+geothermal+exploration+at+Jemez+Pueblo+in+New+Mexico&rft.au=Huang%2C+Lianjie%3BAlbrecht%2C+Michael%3BAnonymous&rft.aulast=Huang&rft.aufirst=Lianjie&rft.date=2011-01-01&rft.volume=191&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Proceedings+-+Workshop+on+Geothermal+Reservoir+Engineering&rft.issn=10582525&rft_id=info:doi/ L2 - http://pangea.stanford.edu/ERE/pdf/IGAstandard/SGW/2011/huang.pdf LA - English DB - GeoRef N1 - Conference title - 36th workshop on Geothermal reservoir engineering N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 6 N1 - PubXState - CA N1 - Document feature - illus. N1 - SuppNotes - Stanford Geothermal Program workshop report SGP-TR-191 N1 - Last updated - 2012-06-07 N1 - SubjectsTermNotLitGenreText - drilling; energy sources; geophysical methods; geophysical surveys; geothermal energy; geothermal exploration; geothermal fields; geothermal reservoirs; geothermal wells; Jemez Mountains; magnetotelluric methods; New Mexico; seismic methods; surveys; United States; well-logging ER - TY - JOUR T1 - The Todilto Formation as an analog of short-lived Martian flood evaporites AN - 1008819557; 2012-041763 AB - The Jurassic Todilto Formation of NW New Mexico and SW Colorado, USA, has utility as an analog of Martian flood evaporites. The Todilto Formation is a concentrically and vertically zoned carbonate (calcite with minor late dolomite) to sulfate (gypsum) evaporite deposit that developed over a short time span (10 (super 4) -10 (super 5) yr) after rapid flooding of the vast dune field of the Entrada Formation. Within the limits of the very different hydrogeologic environments of Mars and Earth, the Todilto setting of short-lived brine evolution in a largely eolian environment, with terminal formation of a salt hydrate common to both planets (gypsum), provides a useful field area for descriptive and petrogenetic studies of evaporite evolution and interaction with a porous, sandy substrate. The Todilto Formation has an added feature of interest in its association with bituminous materials that have likely microbial precursors, providing a brine-microorganism association that may represent a potential setting for primitive life as might be found on Mars. JF - Special Paper - Geological Society of America AU - Vaniman, David AU - Chipera, Steve AU - Brownholland, Kari AU - Bish, David L A2 - Garry, W. Brent A2 - Bleacher, Jacob E. Y1 - 2011 PY - 2011 DA - 2011 SP - 219 EP - 230 PB - Geological Society of America (GSA), Boulder, CO VL - 483 SN - 0072-1077, 0072-1077 KW - United States KW - anhydrite KW - astrobiology KW - Mars KW - New Mexico KW - bassanite KW - terrestrial analogs KW - dolomite KW - sedimentary rocks KW - gypsum KW - floods KW - trace elements KW - chemically precipitated rocks KW - sulfates KW - Jurassic KW - Middle Jurassic KW - evaporites KW - Mesozoic KW - calcite KW - Todilto Formation KW - terrestrial planets KW - planets KW - brines KW - petrography KW - Colorado KW - carbonates KW - 06A:Sedimentary petrology KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1008819557?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Special+Paper+-+Geological+Society+of+America&rft.atitle=The+Todilto+Formation+as+an+analog+of+short-lived+Martian+flood+evaporites&rft.au=Vaniman%2C+David%3BChipera%2C+Steve%3BBrownholland%2C+Kari%3BBish%2C+David+L&rft.aulast=Vaniman&rft.aufirst=David&rft.date=2011-01-01&rft.volume=483&rft.issue=&rft.spage=219&rft.isbn=&rft.btitle=&rft.title=Special+Paper+-+Geological+Society+of+America&rft.issn=00721077&rft_id=info:doi/10.1130%2F2011.2483%2814%29 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 52 N1 - PubXState - CO N1 - Document feature - illus. incl. 2 tables, geol. sketch maps N1 - Last updated - 2012-06-07 N1 - CODEN - GSAPAZ N1 - SubjectsTermNotLitGenreText - anhydrite; astrobiology; bassanite; brines; calcite; carbonates; chemically precipitated rocks; Colorado; dolomite; evaporites; floods; gypsum; Jurassic; Mars; Mesozoic; Middle Jurassic; New Mexico; petrography; planets; sedimentary rocks; sulfates; terrestrial analogs; terrestrial planets; Todilto Formation; trace elements; United States DO - http://dx.doi.org/10.1130/2011.2483(14) ER -