FN Thomson Reuters Web of Science™
VR 1.0
PT J
AU Hossain, MA
Saeed, MA
Fronczek, FR
Wong, BM
Dey, KR
Mendy, JS
Gibson, D
AF Hossain, Md. Alamgir
Saeed, Musabbir A.
Fronczek, Frank R.
Wong, Bryan M.
Dey, Kalpana R.
Mendy, John S.
Gibson, Don
TI Charge-Assisted Encapsulation of Two Chlorides by a Hexaprotonated
Azamacrocycle
SO CRYSTAL GROWTH & DESIGN
LA English
DT Article
ID MOLECULAR-DYNAMICS SIMULATIONS; POLYAMMONIUM MACROCYCLES; ANION-BINDING;
NONCOVALENT INTERACTIONS; COORDINATION CHEMISTRY; COMPLEXES; RECEPTOR;
HOST; NUCLEOTIDES; RECOGNITION
AB A chloride complex of a hexaprotonated azamacrocycle has been isolated, and its structure has been determined by X-ray crystallography showing two encapsulated chloride anions in the cavity. The two internal guests are coordinated at two binding sites on the opposite side of the macrocycle through trigonal recognition by hydrogen-bonding interactions. The other four chlorides are located outside the cavity, each with a single hydrogen bond from secondary amines. Ab initio calculations based on density functional theory (DFT) suggest that the encapsulation of two chlorides inside the cavity leads to a significant charge transfer from the anions to the protonated amines.
C1 [Hossain, Md. Alamgir; Saeed, Musabbir A.; Dey, Kalpana R.; Mendy, John S.; Gibson, Don] Jackson State Univ, Dept Chem & Biochem, Jackson, MS 39217 USA.
[Fronczek, Frank R.] Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA.
[Wong, Bryan M.] Sandia Natl Labs, Dept Chem Mat, Livermore, CA 94551 USA.
RP Hossain, MA (reprint author), Jackson State Univ, Dept Chem & Biochem, Jackson, MS 39217 USA.
EM alamgir@chem.jsums.edu
RI Wong, Bryan/B-1663-2009
OI Wong, Bryan/0000-0002-3477-8043
FU National Center for Research Resources [G12RR013459]; National Science
Foundation [CHE-0821357]; Louisiana Board of Regents [LEQSF
(1999-2000)-ENH-TR-13]
FX The project described was supported by Grant No. G12RR013459 from the
National Center for Research Resources'. This material is based upon
work supported by the National Science Foundation under CHE-0821357.
Purchase of the diffractometer was made possible by Grant No. LEQSF
(1999-2000)-ENH-TR-13, administered by the Louisiana Board of Regents.
NR 45
TC 16
Z9 16
U1 1
U2 5
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1528-7483
J9 CRYST GROWTH DES
JI Cryst. Growth Des.
PD APR
PY 2010
VL 10
IS 4
BP 1478
EP 1481
DI 10.1021/cg100110f
PG 4
WC Chemistry, Multidisciplinary; Crystallography; Materials Science,
Multidisciplinary
SC Chemistry; Crystallography; Materials Science
GA 577OV
UT WOS:000276234500008
PM 20495667
ER
PT J
AU Saeed, MA
Wong, BM
Fronczek, FR
Venkatraman, R
Hossain, MA
AF Saeed, Musabbir A.
Wong, Bryan M.
Fronczek, Frank R.
Venkatraman, Ramaiyer
Hossain, Md. Alamgir
TI Formation of an Amine-Water Cyclic Pentamer: A New Type of Water Cluster
in a Polyazacryptand
SO CRYSTAL GROWTH & DESIGN
LA English
DT Article
ID PROTON-TRANSFER; NONCOVALENT INTERACTIONS; SUPRAMOLECULAR COMPLEX;
PROTEIN TETRABRACHION; DENSITY FUNCTIONALS; SOLID-STATE; ICE; MOLECULES;
(H2O)(N); CRYPTAND
AB Structural analysis of an adduct of a thiophene-based cryptand with tosylic acid shows the formation of a hybrid amine-water cyclic pentamer composed of four water molecules and one protonated amine in the charged hydrophobic cavity. The bulky tosylate groups remain outside the cavity, making the ligand favorable for hosting water molecules. Ab initio calculations based on density functional theory (DFT) confirm that the hybrid amine-water pentamer is stabilized inside the hydrophobic cavity of the cryptand.
C1 [Saeed, Musabbir A.; Venkatraman, Ramaiyer; Hossain, Md. Alamgir] Jackson State Univ, Dept Chem & Biochem, Jackson, MS 39212 USA.
[Wong, Bryan M.] Sandia Natl Labs, Dept Chem Mat, Livermore, CA 94551 USA.
[Fronczek, Frank R.] Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA.
RP Hossain, MA (reprint author), Jackson State Univ, Dept Chem & Biochem, Jackson, MS 39212 USA.
EM alamgir@chem.jsums.edu
RI Wong, Bryan/B-1663-2009
OI Wong, Bryan/0000-0002-3477-8043
FU National Center for Research Resources [G12RR013459]; National Science
Foundation [CHE-0821357]; Louisiana Board of Regents [LEQSF
(1999-2000)-ENH-TR-13]
FX The project described was supported by Grant Number G12RR013459 from the
National Center for Research Resources. This material is based upon work
supported by the National Science Foundation under CHE-0821357. Purchase
or the diffractometer was made possible by Grant No. LEQSF
(1999-2000)-ENH-TR-13, administered by the Louisiana Board of Regents.
NR 43
TC 27
Z9 28
U1 1
U2 6
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1528-7483
EI 1528-7505
J9 CRYST GROWTH DES
JI Cryst. Growth Des.
PD APR
PY 2010
VL 10
IS 4
BP 1486
EP 1488
DI 10.1021/cg100161a
PG 3
WC Chemistry, Multidisciplinary; Crystallography; Materials Science,
Multidisciplinary
SC Chemistry; Crystallography; Materials Science
GA 577OV
UT WOS:000276234500010
PM 20495666
ER
PT J
AU Vega-Sanchez, ME
Ronald, PC
AF Vega-Sanchez, Miguel E.
Ronald, Pamela C.
TI Genetic and biotechnological approaches for biofuel crop improvement
SO CURRENT OPINION IN BIOTECHNOLOGY
LA English
DT Review
ID SEED OIL CONTENT; JATROPHA-CURCAS; DOWN-REGULATION; GLUCURONOXYLAN
BIOSYNTHESIS; LIGNIN MODIFICATION; OVER-EXPRESSION; GENOME SEQUENCE;
CELL-WALLS; PLANT; ARABIDOPSIS
AB Research and development efforts for biofuel production are targeted at converting plant biomass into renewable liquid fuels. Major obstacles for biofuel production include lack of biofuel crop domestication, low oil yields from crop plants as well as recalcitrance of lignocellulose to chemical and enzymatic breakdown. Researchers are expanding the genetic and genomic resources available for crop improvement, elucidating lipid metabolism to facilitate manipulation of fatty acid biosynthetic pathways and studying how plant cell walls are synthesized and assembled. This knowledge will be used to produce the next generation of biofuel crops by increasing fatty acid content and by optimizing the hydrolysis of plant cell walls to release fermentable sugars.
C1 [Vega-Sanchez, Miguel E.; Ronald, Pamela C.] Univ Calif Davis, Dept Plant Pathol, Davis, CA 95616 USA.
[Vega-Sanchez, Miguel E.; Ronald, Pamela C.] Joint BioEnergy Inst, Feedstocks Div, Emeryville, CA 94608 USA.
RP Ronald, PC (reprint author), Univ Calif Davis, Dept Plant Pathol, 1 Shields Ave, Davis, CA 95616 USA.
EM pcronald@ucdavis.edu
RI Vega-Sanchez, Miguel/K-3072-2012
OI Vega-Sanchez, Miguel/0000-0003-0128-2743
FU U.S. Department of Energy, Office of Science, Office of Biological and
Environmental Research between Lawrence Berkeley National Laboratory
[DE-AC02-05CH11231]
FX We would like to thank Laura Bartley, Josh Heazlewood and Rebecca Bart
for useful comments provided on the draft of this manuscript. This work
was part of the DOE Joint BioEnergy Institute (http://www.jbei.org)
supported by the U.S. Department of Energy, Office of Science, Office of
Biological and Environmental Research, through contract
DE-AC02-05CH11231 between Lawrence Berkeley National Laboratory and the
U.S. Department of Energy.
NR 57
TC 42
Z9 42
U1 0
U2 31
PU CURRENT BIOLOGY LTD
PI LONDON
PA 84 THEOBALDS RD, LONDON WC1X 8RR, ENGLAND
SN 0958-1669
J9 CURR OPIN BIOTECH
JI Curr. Opin. Biotechnol.
PD APR
PY 2010
VL 21
IS 2
BP 218
EP 224
DI 10.1016/j.copbio.2010.02.002
PG 7
WC Biochemical Research Methods; Biotechnology & Applied Microbiology
SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology
GA 604UD
UT WOS:000278303100015
PM 20181473
ER
PT J
AU Wuichet, K
Cantwell, BJ
Zhulin, IB
AF Wuichet, Kristin
Cantwell, Brian J.
Zhulin, Igor B.
TI Evolution and phyletic distribution of two-component signal transduction
systems
SO CURRENT OPINION IN MICROBIOLOGY
LA English
DT Review
ID PSEUDO-RESPONSE REGULATORS; HISTIDINE PROTEIN-KINASE; WHOLE-GENOME
ANALYSIS; ARABIDOPSIS-THALIANA; MULTISTEP PHOSPHORELAY; FUNGAL
PATHOGENS; ASP PHOSPHORELAY; GENE-EXPRESSION; FIXL PROTEIN; PROKARYOTES
AB Two-component signal transduction systems are abundant in prokaryotes. They enable cells to adjust multiple cellular functions in response to changing environmental conditions. These systems are also found, although in much smaller numbers, in lower eukaryotes and plants, where they appear to control a few very specific functions. Two-component systems have evolved in Bacteria from much simpler one-component systems bringing about the benefit of extracellular versus intracellular sensing. We review reports establishing the origins of two-component systems and documenting their occurrence in major lineages of Life.
C1 [Wuichet, Kristin; Cantwell, Brian J.; Zhulin, Igor B.] Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA.
[Zhulin, Igor B.] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA.
RP Zhulin, IB (reprint author), Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA.
EM ijouline@utk.edu
RI Zhulin, Igor/A-2308-2012
OI Zhulin, Igor/0000-0002-6708-5323
FU NIH [GM072285]; Office of Biological and Environmental Research in the
DOE Office of Science
FX This work was supported by NIH grant GM072285 and funds from the
BioEnergy Science Center which is supported by the Office of Biological
and Environmental Research in the DOE Office of Science.
NR 56
TC 77
Z9 83
U1 8
U2 32
PU CURRENT BIOLOGY LTD
PI LONDON
PA 84 THEOBALDS RD, LONDON WC1X 8RR, ENGLAND
SN 1369-5274
J9 CURR OPIN MICROBIOL
JI Curr. Opin. Microbiol.
PD APR
PY 2010
VL 13
IS 2
BP 219
EP 225
DI 10.1016/j.mib.2009.12.011
PG 7
WC Microbiology
SC Microbiology
GA 588KZ
UT WOS:000277070100015
PM 20133179
ER
PT J
AU Albrecht, SS
Kuklina, EV
Bansil, P
Jamieson, D
Whiteman, MK
Kourtis, AP
Posner, SF
Callaghan, WM
AF Albrecht, Sandra S.
Kuklina, Elena V.
Bansil, Pooja
Jamieson, Denise
Whiteman, Maura K.
Kourtis, Athena P.
Posner, Samuel F.
Callaghan, William M.
TI Diabetes Trends Among Delivery Hospitalizations in the US, 1994-2004
SO DIABETES CARE
LA English
DT Article
ID DISCHARGE DATA; MELLITUS; POPULATION; PREVALENCE; DIAGNOSIS; WOMEN
AB OBJECTIVE - To examine trends in the prevalence of diabetes among delivery hospitalizations in the U.S. and to describe the characteristics of these hospitalizations.
RESEARCH DESIGN AND METHODS - Hospital discharge data from 1994 through 2004 were obtained from the Nationwide Inpatient Sample. Diagnosis codes were selected for gestational diabetes mellitus (GDM), type 1 diabetes, type 2 diabetes, and unspecified diabetes. Rates of delivery hospitalization with diabetes were calculated per 100 deliveries.
RESULTS - Overall, an estimated 1,863,746 hospital delivery discharges contained a diabetes diagnosis, corresponding to a rate of 4.3 per 100 deliveries over the 11-year period. GDM accounted for the largest proportion of delivery hospitalizations with diabetes (84.7%), followed by type 1 (7%), type 2 (4.7%), and unspecified diabetes (3.6%). From 1994 to 2004, the rates for all diabetes. GDM, type 1 diabetes, and type 2 diabetes significantly increased overall and within each age-group (15-24, 25-34, and >= 35 years) (P < 0.05). The largest percent increase for all ages was among type 2 diabetes (367%). By age-group, the greatest percent increases for each diabetes type were among the two younger groups. Significant predictors of diabetes at delivery included age >= 35 years vs. 15-24 years (odds ratio 4.80 [95% CI 4.72-4.891), urban versus rural location (1.14 [1.1.1-1.17]), and Medicaid/Medicare versus other payment sources (1.29 [1.26-1.32]).
CONCLUSIONS - Given the increasing prevalence of diabetes among delivery hospitalizations, particularly among younger women, it will be important to monitor trends in the pregnant population and target strategies to minimize risk for maternal/Fetal complications.
C1 [Albrecht, Sandra S.] Oak Ridge Inst Sci & Educ, Oak Ridge, TN USA.
[Bansil, Pooja] CONRAD, Atlanta, GA USA.
[Kuklina, Elena V.] Quantell, Mchenry, MD USA.
[Jamieson, Denise; Whiteman, Maura K.; Kourtis, Athena P.; Posner, Samuel F.; Callaghan, William M.] Ctr Dis Control & Prevent, Div Reprod Hlth, Natl Ctr Chron Dis Prevent & Hlth Promot, Atlanta, GA USA.
RP Albrecht, SS (reprint author), Oak Ridge Inst Sci & Educ, Oak Ridge, TN USA.
EM ssalb@umich.edu
RI Whiteman, Matthew/C-6079-2009;
OI Whiteman, Matthew/0000-0002-6583-6779; Posner,
Samuel/0000-0003-1574-585X
NR 26
TC 91
Z9 93
U1 0
U2 7
PU AMER DIABETES ASSOC
PI ALEXANDRIA
PA 1701 N BEAUREGARD ST, ALEXANDRIA, VA 22311-1717 USA
SN 0149-5992
J9 DIABETES CARE
JI Diabetes Care
PD APR
PY 2010
VL 33
IS 4
BP 768
EP 773
DI 10.2337/dc09-1801
PG 6
WC Endocrinology & Metabolism
SC Endocrinology & Metabolism
GA 584ZI
UT WOS:000276793200018
PM 20067968
ER
PT J
AU Salvadori, MC
Araujo, WWR
Teixeira, FS
Cattani, M
Pasquarelli, A
Oks, EM
Brown, IG
AF Salvadori, M. C.
Araujo, W. W. R.
Teixeira, F. S.
Cattani, M.
Pasquarelli, A.
Oks, E. M.
Brown, I. G.
TI Termination of diamond surfaces with hydrogen, oxygen and fluorine using
a small, simple plasma gun
SO DIAMOND AND RELATED MATERIALS
LA English
DT Article
DE Diamond; CVD; Surface terminations; Plasma bombardment; Ion bombardment
ID CHEMICAL-VAPOR-DEPOSITION; CARBON COMPOSITE FILMS; POLYCRYSTALLINE
DIAMOND; FORCE MICROSCOPY; NANOCRYSTALLINE; FUNCTIONALIZATION; ELECTRON;
GROWTH; IONS; GAS
AB We have formed and characterized polycrystalline diamond films with surfaces having hydrogen terminations, oxygen terminations, or fluorine terminations, using a small, simple and novel plasma gun to bombard the diamond surface, formed by plasma assisted CVD in a prior step, with ions of the wanted terminating species. The potential differences between surface regions with different terminations were measured by Kelvin Force Microscopy (KFM). The highest potential occurred for oxygen termination regions and the lowest for fluorine. The potential difference between regions with oxygen terminations and hydrogen terminations was about 80 mV, and between regions with hydrogen terminations and fluorine terminations about 150 mV. Regions with different terminations were identified and imaged using the secondary electron signal provided by scanning electron microscopy (SEM). since this signal presents contrast for surfaces with different electrical properties. The wettability of the surfaces with different terminations was evaluated, measuring contact angles. The sample with oxygen termination was the most hydrophilic, with a contact angle of 75 degrees. hydrogen-terminated regions with 83 degrees, and fluorine regions 93 degrees, the most hydrophobic sample. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Salvadori, M. C.; Araujo, W. W. R.; Cattani, M.] Univ Sao Paulo, Inst Phys, BR-05315970 Sao Paulo, Brazil.
[Teixeira, F. S.] Univ Sao Paulo, Polytech Sch, BR-05315970 Sao Paulo, Brazil.
[Pasquarelli, A.] Univ Ulm, Dept Electron Devices & Circuits, D-89069 Ulm, Germany.
[Oks, E. M.] Russian Acad Sci, Inst High Current Elect, Tomsk 634055, Russia.
[Brown, I. G.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Salvadori, MC (reprint author), Univ Sao Paulo, Inst Phys, CP 66318, BR-05315970 Sao Paulo, Brazil.
EM mcsalva@if.usp.br
RI Salvadori, Maria Cecilia/A-9379-2013; Teixeira, Fernanda/A-9395-2013;
Cattani, Mauro/N-9749-2013; Oks, Efim/A-9409-2014
OI Oks, Efim/0000-0002-9323-0686
FU Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); Conselho
Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil
FX This work was supported by the Fundacao de Amparo a Pesquisa do Estado
de Sao Paulo (FAPESP) and the Conselho Nacional de Desenvolvimento
Cientifico e Tecnologico (CNPq), Brazil.
NR 33
TC 10
Z9 10
U1 0
U2 29
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0925-9635
EI 1879-0062
J9 DIAM RELAT MATER
JI Diam. Relat. Mat.
PD APR
PY 2010
VL 19
IS 4
BP 324
EP 328
DI 10.1016/j.diamond.2010.01.002
PG 5
WC Materials Science, Multidisciplinary
SC Materials Science
GA 576FP
UT WOS:000276130000010
ER
PT J
AU Bouhenni, RA
Vora, GJ
Biffinger, JC
Shirodkar, S
Brockman, K
Ray, R
Wu, P
Johnson, BJ
Biddle, EM
Marshall, MJ
Fitzgerald, LA
Little, BJ
Fredrickson, JK
Beliaev, AS
Ringeisen, BR
Saffarini, DA
AF Bouhenni, Rachida A.
Vora, Gary J.
Biffinger, Justin C.
Shirodkar, Sheetal
Brockman, Ken
Ray, Ricky
Wu, Peter
Johnson, Brandy J.
Biddle, Eulandria M.
Marshall, Matthew J.
Fitzgerald, Lisa A.
Little, Brenda J.
Fredrickson, Jim K.
Beliaev, Alexander S.
Ringeisen, Bradley R.
Saffarini, Daad A.
TI The Role of Shewanella oneidensis MR-1 Outer Surface Structures in
Extracellular Electron Transfer
SO ELECTROANALYSIS
LA English
DT Article
DE Shewanella oneidensis MR-1; Current production; Electron transfer;
Nanofilaments; Riboflavin; Fuel cells
ID MICROBIAL FUEL-CELL; METAL-REDUCING BACTERIUM; II SECRETION SYSTEM;
GEOBACTER-SULFURREDUCENS; ANAEROBIC RESPIRATION; MEMBRANE CYTOCHROMES;
PUTREFACIENS MR-1; IV PREPILIN; KLEBSIELLA-OXYTOCA; ESCHERICHIA-COLI
AB The ability of the metal reducer Shewanella oneidensis MR-1 to generate electricity in microbial fuel cells (MFCs) depends on the activity of a predicted type IV prepilin peptidase; PilD. Analysis of an S. oneidensis MR-1 pilD mutant indicated that it was deficient in pili production (Msh and type IV) and type II secretion (T2S). The requirement for T2S in metal reduction has been previously identified, but the role of pili remains largely unexplored. To define the role of type IV or Msh pili in electron transfer, mutants that lack one or both pilus biogenesis systems were generated and analyzed; a mutant that lacked flagella was also constructed and tested. All mutants were able to reduce insoluble Fe(III) and to generate current in MFCs, in contrast to the T2S mutant that is deficient in both processes. Our results show that loss of metal reduction in a PilD mutant is due to a T2S deficiency, and therefore the absence of c cytochromes from the outer surface of cells, and not the loss of pili or flagella. Furthermore, MR-1 mutants deficient in type IV pili or flagella generated more current than the wild type, even though extracellular riboflavin levels were similar in all strains. This enhanced current generating ability is in contrast to a mutant that lacks the outer membrane c cytochromes, MtrC and OmcA. This mutant generated significantly less current than the wild type in an MFC and was unable to reduce Fe(III). These results indicated that although nanofilaments and soluble mediators may play a role in electron transfer, surface exposure of outer membrane c cytochromes was the determining factor in extracellular electron transfer in S. oneidensis MR-1.
C1 [Biffinger, Justin C.; Wu, Peter; Fitzgerald, Lisa A.; Ringeisen, Bradley R.] USN, Res Lab, Div Chem, Washington, DC 20375 USA.
[Bouhenni, Rachida A.; Shirodkar, Sheetal; Brockman, Ken; Biddle, Eulandria M.; Saffarini, Daad A.] Univ Wisconsin, Dept Biol Sci, Milwaukee, WI 53211 USA.
[Vora, Gary J.; Johnson, Brandy J.] USN, Res Lab, Ctr Biomol Sci & Engn, Washington, DC 20375 USA.
[Ray, Ricky; Little, Brenda J.] USN, Res Lab, Div Oceanog, John C Stennis Space Ctr, MS 39529 USA.
[Marshall, Matthew J.; Fredrickson, Jim K.; Beliaev, Alexander S.] Pacific NW Natl Lab, Richland, WA 99354 USA.
[Bouhenni, Rachida A.] Summa Hlth Syst, Akron, OH 44304 USA.
RP Ringeisen, BR (reprint author), USN, Res Lab, Div Chem, Washington, DC 20375 USA.
EM bradley.ringeisen@nrl.navy.mil; daads@uwm.edu
RI Johnson, Brandy/B-3462-2008; Beliaev, Alexander/E-8798-2016;
OI Johnson, Brandy/0000-0002-3637-0631; Beliaev,
Alexander/0000-0002-6766-4632; Vora, Gary/0000-0002-0657-8597
FU U.S. Department of Energy (DOE) Office of Biological and Environmental
Research; Shewanella Federation consortium; Environmental Remediation
Sciences Program (ERSP); W.R. Wiley Environmental Molecular Sciences
Laboratory; OBER; Office of Naval Research [61153N]; NSF [0723002]; DOE
[DE-AC05-76RL01830]; National Research Council
FX We thank Mark McBride for helpful comments and critical reading of the
manuscript. This research was supported by the U.S. Department of Energy
(DOE) Office of Biological and Environmental Research under the
Genomics: GTL Program via the Shewanella Federation consortium, the
Environmental Remediation Sciences Program (ERSP), by EMSL Scientific
Grand Challenge Project at the W.R. Wiley Environmental Molecular
Sciences Laboratory, a national scientific user facility sponsored by
OBER and located at Pacific Northwest National Laboratory (PNNL), Office
of Naval Research through NRL PE#61153N, and by NSF instrument
acquisition Grant CHE#0723002. Battelle Memorial Institute operates
Northwest National Laboratory for the DOE under contract
DE-AC05-76RL01830. We thank the National Research Council for L.A.F.
Postdoctoral Fellowship.
NR 50
TC 53
Z9 54
U1 3
U2 53
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA POSTFACH 101161, 69451 WEINHEIM, GERMANY
SN 1040-0397
EI 1521-4109
J9 ELECTROANAL
JI Electroanalysis
PD APR
PY 2010
VL 22
IS 7-8
BP 856
EP 864
DI 10.1002/elan.200880006
PG 9
WC Chemistry, Analytical; Electrochemistry
SC Chemistry; Electrochemistry
GA 590VC
UT WOS:000277255400016
ER
PT J
AU Aaron, D
Tsouris, C
Hamilton, CY
Borole, AP
AF Aaron, Doug
Tsouris, Costas
Hamilton, Choo Y.
Borole, Abhijeet P.
TI Assessment of the Effects of Flow Rate and Ionic Strength on the
Performance of an Air-Cathode Microbial Fuel Cell Using Electrochemical
Impedance Spectroscopy
SO ENERGIES
LA English
DT Article
DE biofuel cell; internal resistances; electrogenic; anode impedance;
capacitance
ID INTERNAL RESISTANCE; ELECTRICITY-GENERATION; CONFIGURATION; ANODE; EIS;
PH
AB Impedance changes of the anode, cathode and solution were examined for an air-cathode microbial fuel cell (MFC) under varying conditions. An MFC inoculated with a pre-enriched microbial culture resulted in a startup time of less than ten days. Over this period, the anode impedance decreased below the cathode impedance, suggesting a cathode-limited power output. Increasing the anode flow rate did not impact the anode impedance significantly, but it decreased the cathode impedance by 65%. Increasing the anode-medium ionic strength also decreased the cathode impedance. These impedance results provide insight into electron and proton transport mechanisms and can be used to improve MFC performance.
C1 [Borole, Abhijeet P.] Oak Ridge Natl Lab, BioSci Div, Oak Ridge, TN 37831 USA.
[Aaron, Doug; Tsouris, Costas] Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA.
[Tsouris, Costas] Oak Ridge Natl Lab, Nucl Sci & Technol Div, Oak Ridge, TN 37831 USA.
[Hamilton, Choo Y.] Univ Tennessee, Knoxville, TN 37996 USA.
RP Borole, AP (reprint author), Oak Ridge Natl Lab, BioSci Div, Oak Ridge, TN 37831 USA.
EM doug.aaron@gatech.edu; tsourisc@ornl.gov; chamilto@utk.edu;
borolea@ornl.gov
RI Borole, AP/F-3933-2011; Tsouris, Costas/C-2544-2016;
OI Tsouris, Costas/0000-0002-0522-1027; Borole,
Abhijeet/0000-0001-8423-811X
FU Oak Ridge National Laboratory (ORNL); U.S. Department of Energy [DE
AC05-00OR22725]; American Chemical Society, Green Chemistry Initiative
FX This research was sponsored by the Laboratory Directed Research and
Development Program of Oak Ridge National Laboratory (ORNL), managed by
UT-Battelle, LLC, for the U.S. Department of Energy under Contract No.
DE AC05-00OR22725 and by the American Chemical Society, Petroleum
Research Fund, Green Chemistry Initiative through a grant to Georgia
Institute of Technology.
NR 28
TC 18
Z9 18
U1 3
U2 32
PU MOLECULAR DIVERSITY PRESERVATION INTERNATIONAL-MDPI
PI BASEL
PA KANDERERSTRASSE 25, CH-4057 BASEL, SWITZERLAND
SN 1996-1073
J9 ENERGIES
JI Energies
PD APR
PY 2010
VL 3
IS 4
BP 592
EP 606
DI 10.3390/en3040592
PG 15
WC Energy & Fuels
SC Energy & Fuels
GA 588XP
UT WOS:000277108300001
ER
PT J
AU Cappers, P
Goldman, C
Kathan, D
AF Cappers, Peter
Goldman, Charles
Kathan, David
TI Demand response in US electricity markets: Empirical evidence
SO ENERGY
LA English
DT Article
DE Demand response; Public policy; Empirical analysis; Wholesale
electricity markets
AB Empirical evidence concerning demand response (DR) resources is needed in order to establish baseline conditions, develop standardized methods to assess DR availability and performance, and to build confidence among policymakers, utilities, system operators, and stakeholders that DR resources do offer a viable, cost-effective alternative to supply-side investments. This paper summarizes the existing contribution of DR resources in U.S. electric power markets. In 2008, customers enrolled in existing wholesale and retail DR programs were capable of providing similar to 38,000 MW of potential peak load reductions in the United States. Participants in organized wholesale market DR programs, though, have historically overestimated their likely performance during declared curtailments events, but appear to be getting better as they and their agents gain experience. In places with less developed organized wholesale market DR programs, utilities are learning how to create more flexible DR resources by adapting legacy load management programs to fit into existing wholesale market constructs. Overall, the development of open and organized wholesale markets coupled with direct policy support by the Federal Energy Regulatory Commission has facilitated new entry by curtailment service providers, which has likely expanded the demand response industry and led to product and service innovation. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Cappers, Peter; Goldman, Charles] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Kathan, David] Fed Energy Regulatory Commiss, Washington, DC 20426 USA.
RP Cappers, P (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
EM pacappers@lbl.gov
RI Quezada, George/I-1106-2012
OI Quezada, George/0000-0002-4060-6109
NR 22
TC 122
Z9 128
U1 17
U2 41
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0360-5442
J9 ENERGY
JI Energy
PD APR
PY 2010
VL 35
IS 4
SI SI
BP 1526
EP 1535
DI 10.1016/j.energy.2009.06.029
PG 10
WC Thermodynamics; Energy & Fuels
SC Thermodynamics; Energy & Fuels
GA 590IF
UT WOS:000277218100003
ER
PT J
AU Wang, JH
Bloyd, CN
Hu, ZG
Tan, ZF
AF Wang, Jianhui
Bloyd, Cary N.
Hu, Zhaoguang
Tan, Zhongfu
TI Demand response in China
SO ENERGY
LA English
DT Article
DE Demand response; Demand-side management; China
ID ELECTRICITY SUPPLY INDUSTRY; HONG-KONG
AB The escalating demand for electricity in China has caused an electricity shortage in the past several years. This paper discusses the role of demand response (DR) as an integral component in alleviating the problem and coping with this shortfall. It reviews current experience with DR programs, analyzes China's situation and makes suggestions for DR implementation. Although China's DR programs offer high potential to succeed, they require substantial efforts in resolving such key issues as the programs' funding mechanisms, pricing, and relationship with electricity industry reform. Published by Elsevier Ltd.
C1 [Wang, Jianhui] Argonne Natl Lab, Argonne, IL 60439 USA.
[Bloyd, Cary N.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Hu, Zhaoguang] State Power Econ Res Inst, Beijing 100761, Peoples R China.
[Tan, Zhongfu] N China Elect Power Univ, Beijing 102206, Peoples R China.
RP Wang, JH (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM jianhui.wang@anl.gov
FU U.S. Department of Energy. [E-AC-02-06CH11357]
FX The authors want to thank C.K. Woo and L Greening for their valuable
comments. Any errors or mistakes are the authors'. The work of Jianhui
Wang was supported by UChicago Argonne, LLC, under Contract No.
E-AC-02-06CH11357 with the U.S. Department of Energy.
NR 11
TC 54
Z9 57
U1 0
U2 13
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0360-5442
J9 ENERGY
JI Energy
PD APR
PY 2010
VL 35
IS 4
SI SI
BP 1592
EP 1597
DI 10.1016/j.energy.2009.06.020
PG 6
WC Thermodynamics; Energy & Fuels
SC Thermodynamics; Energy & Fuels
GA 590IF
UT WOS:000277218100011
ER
PT J
AU Conklin, JC
Szybist, JP
AF Conklin, James C.
Szybist, James P.
TI A highly efficient six-stroke internal combustion engine cycle with
water injection for in-cylinder exhaust heat recovery
SO ENERGY
LA English
DT Article
DE Engine efficiency; Six-stroke cycle; Water injection; Steam cycle
AB A concept adding two strokes to the Otto or Diesel engine cycle to increase fuel efficiency is presented here. It can be thought of as a four-stroke Otto or Diesel cycle followed by a two-stroke heat recovery steam cycle. A partial exhaust event coupled with water injection adds an additional power stroke. Waste heat from two sources is effectively converted into usable work: engine coolant and exhaust gas. An ideal thermodynamics model of the exhaust gas compression, water injection and expansion was used to investigate this modification. By changing the exhaust valve closing timing during the exhaust stroke, the optimum amount of exhaust can be recompressed, maximizing the net mean effective pressure of the steam expansion stroke (MEP(steam)). The valve closing timing for maximum MEP(steam) is limited by either 1 bar or the dew point temperature of the expansion gas/moisture mixture when the exhaust valve opens. The range of MEP(steam) calculated for the geometry of a conventional gasoline engine and is from 0.75 to 2.5 bars. Typical combustion mean effective pressures (MEP(combustion)) Of naturally aspirated gasoline engines are up to 10 bar, thus this concept has the potential to significantly increase the engine efficiency and fuel economy. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Conklin, James C.; Szybist, James P.] Oak Ridge Natl Lab, Knoxville, TN 37932 USA.
RP Szybist, JP (reprint author), Oak Ridge Natl Lab, 2360 Cherahala Blvd, Knoxville, TN 37932 USA.
EM szybistjp@ornl.gov
RI lee, yunzhu/G-1723-2011
NR 11
TC 37
Z9 38
U1 3
U2 13
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0360-5442
J9 ENERGY
JI Energy
PD APR
PY 2010
VL 35
IS 4
SI SI
BP 1658
EP 1664
DI 10.1016/j.energy.2009.12.012
PG 7
WC Thermodynamics; Energy & Fuels
SC Thermodynamics; Energy & Fuels
GA 590IF
UT WOS:000277218100018
ER
PT J
AU Gao, ZM
AF Gao, Zhiming
TI The Impact of thermostatic expansion valve heating on the performance of
air-source heat pumps in heating mode
SO ENERGY CONVERSION AND MANAGEMENT
LA English
DT Article
DE Heat pump; Energy saving; Thermal comfort; Thermostatic expansion valve
ID PRESSURE-DROP
AB This paper discusses the strategy of improving the efficiency of air-source heat pumps by adding a small amount of heat to the sensor of the thermostatic expansion valve (TXV). TXV heating retards the closing of the valve and boosts energy efficiency in heating mode. Test results demonstrate that appropriate TXV heating achieves an improvement in coefficient of performance (COP) and thermal comfort. The required heating power is no more than 40 W and the additional equipment cost is less than $20 at manufacturer cost (2006). Thus, the strategy of TXV heating is both technologically practical and low cost. (C) 2009 Elsevier Ltd. All rights reserved.
C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Gao, ZM (reprint author), Oak Ridge Natl Lab, POB 2008,MS6472, Oak Ridge, TN 37831 USA.
OI Gao, Zhiming/0000-0002-7139-7995
FU ORAU/ORISE
FX This work was performed at Oak Ridge National Laboratory (ORNL), which
is managed by UT-Battelle LLC. The work was also sponsored by
ORAU/ORISE. The authors are grateful to Dr. C Keith Rice and Dr. Jim
Conklin, at ORNL, who contributed very helpful suggestions and insights
to this effort. Thanks also to Erica Atkin for technical editing and
assistance in preparing this paper.
NR 18
TC 2
Z9 2
U1 0
U2 0
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0196-8904
J9 ENERG CONVERS MANAGE
JI Energy Conv. Manag.
PD APR
PY 2010
VL 51
IS 4
BP 732
EP 739
DI 10.1016/j.enconman.2009.10.030
PG 8
WC Thermodynamics; Energy & Fuels; Mechanics
SC Thermodynamics; Energy & Fuels; Mechanics
GA 562ZV
UT WOS:000275095800014
ER
PT J
AU Rassat, SD
Aardahl, CL
Autrey, T
Smith, RS
AF Rassat, Scot D.
Aardahl, Christopher L.
Autrey, Tom
Smith, R. Scott
TI Thermal Stability of Ammonia Borane: A Case Study for Exothermic
Hydrogen Storage Materials
SO ENERGY & FUELS
LA English
DT Article
ID N-H COMPOUNDS; CATALYZED DEHYDROGENATION; DECOMPOSITION; RELEASE;
H3NBH3; NMR
AB A model to determine the thermal stability of chemical hydrogen storage materials was developed to predict the stability of ammonia borane at 50-60 degrees C, the extreme range of environmental temperatures for hydrogen storage materials in PEM fuel cell applications. Experimental data from differential scanning calorimetry measurements between 70 and 85 degrees C were used to develop isothermal and adiabatic reactivity models that could be extrapolated down to temperatures of interest. Results of the analysis show that solid ammonia borane is metastable in the 50-60 degrees C range, having stability against appreciable reaction on the order of a week at 60 degrees C and months at 50 degrees C. An adiabatic analysis is the most extreme case, and stability of many days under such extreme conditions indicates that solid ammonia borane may be suited to most hydrogen storage applications. This type of analysis is also applicable to other candidate hydrogen storage materials.
C1 [Rassat, Scot D.; Aardahl, Christopher L.; Autrey, Tom; Smith, R. Scott] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Rassat, SD (reprint author), Pacific NW Natl Lab, POB 999,902 Battelle Blvd, Richland, WA 99352 USA.
EM sd.rassat@pnl.gov
RI Smith, Scott/G-2310-2015
OI Smith, Scott/0000-0002-7145-1963
NR 31
TC 30
Z9 31
U1 2
U2 23
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0887-0624
J9 ENERG FUEL
JI Energy Fuels
PD APR
PY 2010
VL 24
BP 2596
EP 2606
DI 10.1021/ef901430a
PG 11
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 581YZ
UT WOS:000276563300051
ER
PT J
AU Greene, DL
AF Greene, David L.
TI Measuring energy security: Can the United States achieve oil
independence?
SO ENERGY POLICY
LA English
DT Article
DE Oil dependence; Energy security; Energy metrics
AB Stochastic simulation of the direct economic costs of oil dependence in an uncertain future is proposed as a useful metric of oil dependence. The market failure from which these costs arise is imperfect competition in the world oil market, chiefly as a consequence of the use of market power by the Organization of the Petroleum Exporting Countries (OPEC) cartel. Oil dependence costs can be substantial. It is estimated that oil dependence costs to the US economy in 2008 will exceed $500 billion. Other costs, such as military expenditures or foreign policy constraints are deemed to be largely derivative of the actual or potential economic costs of oil dependence. The use of quantifiable economic costs as a security metric leads to a measurable definition of oil independence, or oil security, which can be used to test the ability of specific policies to achieve oil independence in an uncertain future. (C) 2009 Elsevier Ltd. All rights reserved.
C1 Oak Ridge Natl Lab, Natl Transportat Res Ctr, Knoxville, TN 37932 USA.
RP Greene, DL (reprint author), Oak Ridge Natl Lab, Natl Transportat Res Ctr, 2360 Cherahala Blvd, Knoxville, TN 37932 USA.
EM dlgreene@ornl.gov
NR 32
TC 51
Z9 52
U1 0
U2 16
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0301-4215
J9 ENERG POLICY
JI Energy Policy
PD APR
PY 2010
VL 38
IS 4
BP 1614
EP 1621
DI 10.1016/j.enpol.2009.01.041
PG 8
WC Energy & Fuels; Environmental Sciences; Environmental Studies
SC Energy & Fuels; Environmental Sciences & Ecology
GA 603ZM
UT WOS:000278247000003
ER
PT J
AU FrantzDale, B
Plimpton, SJ
Shephard, MS
AF FrantzDale, Benjamin
Plimpton, Steven J.
Shephard, Mark S.
TI Software components for parallel multiscale simulation: an example with
LAMMPS
SO ENGINEERING WITH COMPUTERS
LA English
DT Article
DE Atomistic to continuum coupling; LAMMPS; Software design; Molecular
dynamics; Multiscale computation
AB Multiscale simulation is a promising approach for addressing a variety of real-world engineering problems. Various mathematical approaches have been proposed to link single-scale models of physics into multiscale models. In order to be effective, new multiscale simulation algorithms must be implemented which use partial results provided by single-scale software. This work considers aspects of software design for interfacing to existing single-scale simulation code to perform multiscale simulations on a parallel machine. As a practical example, we extended the large-scale atomistic/molecular massively parallel simulator (LAMMPS) atomistic simulation software to facilitate its efficient use as a component of parallel multiscale-simulation software. This required new library interface functions to LAMMPS that side-stepped its dependence on files for input and output and provided efficient access to LAMMPS's internal state. As a result, we were able to take advantage of LAMMPS's single-scale performance without adding any multiscale-specific code to LAMMPS itself. We illustrate the use of LAMMPS as a component in three different modes: as a stand-alone application called by a multiscale code, as a parallel library invoked by a serial multiscale code, and as a parallel library invoked by a parallel multiscale code. We conclude that it is possible to efficiently re-use existing single-scale simulation software as a component in multiscale-simulation software.
C1 [FrantzDale, Benjamin; Shephard, Mark S.] Rensselaer Polytech Inst, Res Ctr Comp Sci, Troy, NY 12180 USA.
[Plimpton, Steven J.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP FrantzDale, B (reprint author), Rensselaer Polytech Inst, Res Ctr Comp Sci, Troy, NY 12180 USA.
EM bfrantz@scorec.rpi.edu; sjplimpton@sandia.gov; mark@scorec.rpi.edu
FU DOD (ARMY) [W911QX-06-6-0048]
FX The enhancements to LAMMPS described in this paper are part of the
general open-source release, available for download from
http://lammps.sandia.gov/. This work is supported by in part by a SBIR
project from the DOD (ARMY) to Simmetrix Inc. and Rensselaer Polytechnic
Institute entitled "The Multiscale Application Suite" (project number
W911QX-06-6-0048).
NR 7
TC 14
Z9 16
U1 3
U2 26
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0177-0667
J9 ENG COMPUT-GERMANY
JI Eng. Comput.
PD APR
PY 2010
VL 26
IS 2
BP 205
EP 211
DI 10.1007/s00366-009-0156-z
PG 7
WC Computer Science, Interdisciplinary Applications; Engineering,
Mechanical
SC Computer Science; Engineering
GA 573YI
UT WOS:000275953000011
ER
PT J
AU Samara, F
Wyrzykowska, B
Tabor, D
Touati, D
Gullett, BK
AF Samara, Fatin
Wyrzykowska, Barbara
Tabor, Dennis
Touati, Dahman
Gullett, Brian K.
TI Toxicity comparison of chlorinated and brominated dibenzo-p-dioxins and
dibenzofurans in industrial source samples by HRGC/HRMS and enzyme
immunoassay
SO ENVIRONMENT INTERNATIONAL
LA English
DT Article
DE PBDDs/Fs; PCDDs/Fs; PBCDDs/Fs; CALUX; EIA; HRGC/HRMS
ID EQUIVALENCY FACTORS; MICRO-EROD; CALUX; ASSAY; INDUCTION; BIOASSAY;
PCBS; SOIL; GAS
AB Limited information is available on the applicability of polychlorinated dibenzo-p-dioxin/furan (PCDD/F) toxicity assays to their brominated counterparts: polybrominated dibenzo-p-dioxins/furans (PBDDs/Fs). We estimated the toxicity of mixtures of chlorinated, brominated, and mixed bromochloro-dioxins and -furan (PBCDDs/Fs) laboratory standards using a chemically-activated luciferase gene expression cell bioassay (CALUX). The relative effects potency (REP) values obtained were comparable to the World Health Organization (WHO) toxic equivalency factors (TEFs) and in agreement with the concept of additive congener toxicity of mixtures of dioxins and furans. Enzyme immunoassay (EIA)-based toxic equivalents (TEQs), however, showed overestimation for PCDDs/Fs (0-4 orders of magnitudes higher) and underestimation for PBDDs/Fs (0-1 orders of magnitude lower) when compared to high resolution gas chromatography/high resolution mass spectrometry (HRGC/HRMS)-based TEQ calculation (using WHO TEFs) in samples from an industrial source line. No correlation was found between the EIA and the HRGC/HRMS data, which could be attributed to differences in homologue-specific cross-reactivity responses, sample matrix type, and presence of other compounds competing for antibody binding in the immunoassay. Published by Elsevier Ltd.
C1 [Samara, Fatin; Wyrzykowska, Barbara; Tabor, Dennis; Gullett, Brian K.] US EPA, Off Res & Dev, Natl Risk Management Res Lab E305 01, Res Triangle Pk, NC 27711 USA.
[Wyrzykowska, Barbara] Oak Ridge Inst Sci & Educ Res, Postdoctoral Program, Oak Ridge, TN 37831 USA.
[Touati, Dahman] ARCADIS US Inc, Durham, NC 27713 USA.
RP Gullett, BK (reprint author), US EPA, Off Res & Dev, Natl Risk Management Res Lab E305 01, 109 TW Alexander Dr, Res Triangle Pk, NC 27711 USA.
EM gullett.brian@epa.gov
NR 28
TC 15
Z9 15
U1 0
U2 5
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0160-4120
J9 ENVIRON INT
JI Environ. Int.
PD APR
PY 2010
VL 36
IS 3
BP 247
EP 253
DI 10.1016/j.envint.2009.12.005
PG 7
WC Environmental Sciences
SC Environmental Sciences & Ecology
GA 568RH
UT WOS:000275539700003
PM 20110126
ER
PT J
AU Keating, EH
Fessenden, J
Kanjorski, N
Koning, DJ
Pawar, R
AF Keating, Elizabeth H.
Fessenden, Julianna
Kanjorski, Nancy
Koning, Daniel J.
Pawar, Rajesh
TI The impact of CO2 on shallow groundwater chemistry: observations at a
natural analog site and implications for carbon sequestration
SO ENVIRONMENTAL EARTH SCIENCES
LA English
DT Article
DE Aqueous geochemistry; Ground water contamination; Risk assessment
ID DISSOLUTION KINETICS; NEW-MEXICO; ROCK INTERACTIONS; MAMMOTH MOUNTAIN;
VALLES CALDERA; 25-DEGREES-C; BICARBONATE; VESUVIUS; DIOXIDE; AQUIFER
AB In a natural analog study of risks associated with carbon sequestration, impacts of CO2 on shallow groundwater quality have been measured in a sandstone aquifer in New Mexico, USA. Despite relatively high levels of dissolved CO2, originating from depth and producing geysering at one well, pH depression and consequent trace element mobility are relatively minor effects due to the buffering capacity of the aquifer. However, local contamination due to influx of brackish waters in a subset of wells is significant. Geochemical modeling of major ion concentrations suggests that high alkalinity and carbonate mineral dissolution buffers pH changes due to CO2 influx. Analysis of trends in dissolved trace elements, chloride, and CO2 reveal no evidence of in situ trace element mobilization. There is clear evidence, however, that As, U, and Pb are locally co-transported into the aquifer with CO2-rich brackish water. This study illustrates the role that local geochemical conditions will play in determining the effectiveness of monitoring strategies for CO2 leakage. For example, if buffering is significant, pH monitoring may not effectively detect CO2 leakage. This study also highlights potential complications that CO2 carrier fluids, such as brackish waters, pose in monitoring impacts of geologic sequestration.
C1 [Keating, Elizabeth H.; Fessenden, Julianna; Pawar, Rajesh] Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA.
[Kanjorski, Nancy] Geosci Consultants, Los Alamos, NM 87544 USA.
[Koning, Daniel J.] New Mexico Inst Min & Technol, New Mexico Bur Geol & Mineral Resources, Socorro, NM 87801 USA.
RP Keating, EH (reprint author), Los Alamos Natl Lab, Div Earth & Environm Sci, MS T003, Los Alamos, NM 87545 USA.
EM ekeating@lanl.gov
FU US DOE
FX This work was supported by the US DOE through the Zero Emission Research
Technology (ZERT) project. We thank Jim Roberts for access to his wells
and to all the other residents of Chimayo for allowing us to sample
their water. We thank Toti Larson, Emily Kluk, Mike Rearick, and George
Perkins for their laboratory analyses and discussions on data
interpretation. We also gained invaluable insight from discussions with
Bill Carey and Dennis Newell. Andi Kron assisted with illustrations. We
appreciate thoughtful discussion with June Fabryka-Martin and the
manuscript was greatly improved by the comments from one anonymous
reviewer.
NR 46
TC 71
Z9 73
U1 3
U2 36
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1866-6280
J9 ENVIRON EARTH SCI
JI Environ. Earth Sci.
PD APR
PY 2010
VL 60
IS 3
BP 521
EP 536
DI 10.1007/s12665-009-0192-4
PG 16
WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources
SC Environmental Sciences & Ecology; Geology; Water Resources
GA 582YJ
UT WOS:000276637100007
ER
PT J
AU Maltrud, M
Bryan, F
Peacock, S
AF Maltrud, Mathew
Bryan, Frank
Peacock, Synte
TI Boundary impulse response functions in a century-long eddying global
ocean simulation
SO ENVIRONMENTAL FLUID MECHANICS
LA English
DT Article
DE Modeling; Ocean circulation; Tracers; Timescales
ID TRANSIT-TIME DISTRIBUTIONS; MODEL; AGE; TRANSPORT; TEMPERATURE; TRACER;
WATER; LAYER
AB Results are presented from a century-long 1/10A degrees global ocean simulation that included a suite of age-related passive tracers. In particular, an ensemble of five global Boundary Impulse Response functions (BIRs, which are statistically related to the more fundamental Transit Time Distributions, TTDs) was included to quantify the character of the TTD when mesoscale eddies are explicitly simulated rather than parameterized. We also seek to characterize the level of variability in water mass ventilation timescales arising from eddy motions. The statistics of the BIR timeseries are described, and it is shown that the greatest variability occurs at early times, followed by a remarkable conformity between ensemble members at longer timescales. The statistics of the first moment of the BIRs are presented, and the upper-ocean spatial distribution of the standard deviation of the first moment of the BIRs discussed. It is shown that variations in the BIR first moment with respect to the ensemble average are typically only a few percent, and that the variability slightly decreases with increasing ensemble size, implying that only a few ensemble members may be necessary for a reasonable estimate of the TTD. The completeness of the estimated TTD, i.e., the degree to which the century long BIRs capture the range of global ocean ventilation timescales is discussed, and the potential for extrapolation of the BIR to longer times is briefly explored. Several regional BIRs were also simulated in order to quantify the relative abundance of fluid parcels that originate in specific geographical locations.
C1 [Maltrud, Mathew] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Bryan, Frank; Peacock, Synte] Natl Ctr Atmospher Res, Boulder, CO 80307 USA.
RP Maltrud, M (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM maltrud@lanl.gov
RI Bryan, Frank/I-1309-2016
OI Bryan, Frank/0000-0003-1672-8330
FU Department of Energy Office of Science Climate Change Prediction
Program; National Science Foundation; National Center for Atmospheric
Research; National Center for Computational Sciences at Oak Ridge
National Laboratory; INCITE program; National Center for Atmospheric
Research Computational and Information Systems Laboratory
FX M. M. was supported by the Department of Energy Office of Science
Climate Change Prediction Program. Participation of F. B. and S. P. was
supported by the National Science Foundation by its sponsorship of the
National Center for Atmospheric Research. The simulation was performed
at the National Center for Computational Sciences at Oak Ridge National
Laboratory with computer time awarded under the INCITE program, and at
the National Center for Atmospheric Research Computational and
Information Systems Laboratory.
NR 26
TC 48
Z9 48
U1 0
U2 15
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1567-7419
J9 ENVIRON FLUID MECH
JI Environ. Fluid Mech.
PD APR
PY 2010
VL 10
IS 1-2
BP 275
EP 295
DI 10.1007/s10652-009-9154-3
PG 21
WC Environmental Sciences; Mechanics; Meteorology & Atmospheric Sciences;
Oceanography; Water Resources
SC Environmental Sciences & Ecology; Mechanics; Meteorology & Atmospheric
Sciences; Oceanography; Water Resources
GA 551HN
UT WOS:000274197800016
ER
PT J
AU Newmark, RL
Friedmann, SJ
Carroll, SA
AF Newmark, Robin L.
Friedmann, Samuel J.
Carroll, Susan A.
TI Water Challenges for Geologic Carbon Capture and Sequestration
SO ENVIRONMENTAL MANAGEMENT
LA English
DT Article
DE Carbon capture and sequestration; Groundwater resources
ID STORAGE; CO2
AB Carbon capture and sequestration (CCS) has been proposed as a means to dramatically reduce greenhouse gas emissions with the continued use of fossil fuels. For geologic sequestration, the carbon dioxide is captured from large point sources (e.g., power plants or other industrial sources), transported to the injection site and injected into deep geological formations for storage. This will produce new water challenges, such as the amount of water used in energy resource development and utilization and the "capture penalty" for water use. At depth, brine displacement within formations, storage reservoir pressure increases resulting from injection, and leakage are potential concerns. Potential impacts range from increasing water demand for capture to contamination of groundwater through leakage or brine displacement. Understanding these potential impacts and the conditions under which they arise informs the design and implementation of appropriate monitoring and controls, important both for assurance of environmental safety and for accounting purposes. Potential benefits also exist, such as co-production and treatment of water to both offset reservoir pressure increase and to provide local water for beneficial use.
C1 [Newmark, Robin L.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
[Friedmann, Samuel J.; Carroll, Susan A.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
RP Newmark, RL (reprint author), Natl Renewable Energy Lab, MS 1713,1617 Cole Blvd, Golden, CO 80401 USA.
EM robin.newmark@nrel.gov
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]
FX This work was performed under the auspices of the U.S. Department of
Energy by Lawrence Livermore National Laboratory under Contract
DE-AC52-07NA27344. This document was prepared as an account of work
sponsored by an agency of the United States government. Neither the
United States government nor Lawrence Livermore National Security, LLC,
nor any of their employees makes any warranty, expressed or implied, or
assumes any legal liability or responsibility for the accuracy,
completeness, or usefulness of any information, apparatus, product, or
process disclosed, or represents that its use would not infringe
privately owned rights. Reference herein to any specific commercial
product, process, or service by trade name, trademark, manufacturer, or
otherwise does not necessarily constitute or imply its endorsement,
recommendation, or favoring by the United States government or Lawrence
Livermore National Security, LLC. The views and opinions of authors
expressed herein do not necessarily state or reflect those of the United
States government or Lawrence Livermore National Security, LLC, and
shall not be used for advertising or product endorsement purposes. We
acknowledge three anonymous reviewers for their meaningful suggestions.
NR 47
TC 26
Z9 27
U1 5
U2 27
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0364-152X
J9 ENVIRON MANAGE
JI Environ. Manage.
PD APR
PY 2010
VL 45
IS 4
BP 651
EP 661
DI 10.1007/s00267-010-9434-1
PG 11
WC Environmental Sciences
SC Environmental Sciences & Ecology
GA 583EE
UT WOS:000276655100001
PM 20127328
ER
PT J
AU Mayali, X
Palenik, B
Burton, RS
AF Mayali, Xavier
Palenik, Brian
Burton, Ronald S.
TI Dynamics of marine bacterial and phytoplankton populations using
multiplex liquid bead array technology
SO ENVIRONMENTAL MICROBIOLOGY
LA English
DT Article
ID 16S RIBOSOMAL-RNA; MICROBIAL DIVERSITY; OLIGONUCLEOTIDE MICROARRAY;
COMMUNITY DYNAMICS; CLONE LIBRARIES; FLOW-CYTOMETRY; DIATOM BLOOM;
OREGON COAST; TIME-SERIES; MICROORGANISMS
AB Heterotrophic bacteria and phytoplankton dominate the biomass and play major roles in the biogeochemical cycles of the surface ocean. Here, we designed and tested a fast, high-throughput and multiplexed hybridization-based assay to detect populations of marine heterotrophic bacteria and phytoplankton based on their small subunit ribosomal DNA sequences. The assay is based on established liquid bead array technology, an approach that is gaining acceptance in biomedical research but remains underutilized in ecology. End-labelled PCR products are hybridized to taxon-specific oligonucleotide probes attached to fluorescently coded beads followed by flow cytometric detection. We used ribosomal DNA environmental clone libraries (a total of 450 clones) and cultured isolates to design and test 26 bacterial and 10 eukaryotic probes specific to various ribotypes and genera of heterotrophic bacteria and eukaryotic phytoplankton. Pure environmental clones or cultures were used as controls and demonstrated specificity of the probes to their target taxa. The quantitative nature of the assay was demonstrated by a significant relationship between the number of target molecules and fluorescence signal. Clone library sequencing and bead array fluorescence from the same sample provided consistent results. We then applied the assay to a 37-day time series of coastal surface seawater samples from the Southern California Bight to examine the temporal dynamics of microbial communities on the scale of days to weeks. As expected, several bacterial phylotypes were positively correlated with total bacterial abundances and chlorophyll a concentrations, but others were negatively correlated. Bacterial taxa belonging to the same broad taxonomic groups did not necessarily correlate with one another, confirming recent results suggesting that inferring ecological role from broad taxonomic identity may not always be accurate.
C1 [Mayali, Xavier; Palenik, Brian; Burton, Ronald S.] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA.
RP Mayali, X (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA.
EM mayali1@llnl.gov
RI Burton, Ron/F-7694-2010
FU National Science Foundation
FX We thank M. Latz and M. Hildebrand for protist cultures and P. Huh, C.
Tat and A. Yamamoto for assistance in the laboratory. We are grateful
for insightful discussions with V. Tai, E. Brodie and R. Mueller. This
work was supported by a grant from the National Science Foundation to
R.S.B. and B.P.
NR 45
TC 9
Z9 9
U1 1
U2 16
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1462-2912
J9 ENVIRON MICROBIOL
JI Environ. Microbiol.
PD APR
PY 2010
VL 12
IS 4
BP 975
EP 989
DI 10.1111/j.1462-2920.2009.02142.x
PG 15
WC Microbiology
SC Microbiology
GA 587XO
UT WOS:000277029900012
PM 20105218
ER
PT J
AU Moran, KK
Jastrow, JD
AF Moran, Kelly K.
Jastrow, Julie D.
TI Elevated carbon dioxide does not offset loss of soil carbon from a
corn-soybean agroecosystem
SO ENVIRONMENTAL POLLUTION
LA English
DT Article; Proceedings Paper
CT Meeting on Facing the Future
CY APR 02-04, 2008
CL Rhinelander, WI
SP Aspen FACE, SoyFACE, SFB 607
DE Carbon dioxide; Soil carbon; Soil organic matter; Soil aggregate;
Agroecosystem
ID ORGANIC-MATTER DYNAMICS; CO2 ENRICHMENT FACE; ATMOSPHERIC CO2;
LONG-TERM; NITROGEN DYNAMICS; POPLAR PLANTATION; TILLAGE PRACTICES;
CLIMATE-CHANGE; CROP YIELD; SEQUESTRATION
AB The potential for storing additional C in U.S. Corn Belt soils - to offset rising atmospheric [CO(2)] - is large. Long-term cultivation has depleted substantial soil organic matter (SUM) stocks that once existed in the region's native ecosystems. In central Illinois, free-air CO(2) enrichment technology was used to investigate the effects of elevated [CO(2)] on SUM pools in a conservation tilled corn-soybean rotation. After 5 and 6 y of CO(2) enrichment, we investigated the distribution of C and N among soil fractions with varying ability to protect SUM from rapid decomposition. None of the isolated C or N pools, or bulk-soil C or N, was affected by CO(2) treatment. However, the site has lost soil C and N. largely from unprotected pools, regardless of CO(2) treatment since the experiment began. These findings suggest management practices have affected soil C and N stocks and dynamics more than the increased inputs from CO(2)-stimulated photosynthesis. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Moran, Kelly K.; Jastrow, Julie D.] Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA.
RP Moran, KK (reprint author), Argonne Natl Lab, Biosci Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM moran@anl.gov; jdjastrow@anl.gov
NR 69
TC 11
Z9 11
U1 4
U2 18
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0269-7491
J9 ENVIRON POLLUT
JI Environ. Pollut.
PD APR
PY 2010
VL 158
IS 4
SI SI
BP 1088
EP 1094
DI 10.1016/j.envpol.2009.07.005
PG 7
WC Environmental Sciences
SC Environmental Sciences & Ecology
GA 579OX
UT WOS:000276382400019
PM 19631429
ER
PT J
AU Cutting, RS
Coker, VS
Telling, ND
Kimber, RL
Pearce, CI
Ellis, BL
Lawson, RS
Van der Laan, G
Pattrick, RAD
Vaughan, DJ
Arenholz, E
Lloyd, JR
AF Cutting, Richard S.
Coker, Victoria S.
Telling, Neil D.
Kimber, Richard L.
Pearce, Carolyn I.
Ellis, Beverly L.
Lawson, Richard S.
Van der Laan, Gerrit
Pattrick, Richard A. D.
Vaughan, David J.
Arenholz, Elke
Lloyd, Jonathan R.
TI Optimizing Cr(VI) and Tc(VII) Remediation through Nanoscale Biomineral
Engineering
SO ENVIRONMENTAL SCIENCE & TECHNOLOGY
LA English
DT Article
ID 2P ABSORPTION-SPECTRA; SYNTHETIC SCHWERTMANNITE;
GEOBACTER-SULFURREDUCENS; ORGANIC CONTAMINANTS; CHROMATE REMOVAL;
IRON-OXIDES; FE-II; REDUCTION; CHROMIUM; MAGNETITE
AB The influence of Fe(III) starting material on the ability of magnetically recoverable biogenic magnetites produced by Geobacter sulfurreducens to retain metal oxyanion contaminants has been investigated. The reduction/removal of aqueous Cr(VI) was used to probe the reactivity of the biomagnetites. Nanomagnetites produced by the bacterial reduction of schwertmannite powder were more efficient at reducing Cr(VI) than either ferrihydrite "gel"-derived biomagnetite or commercial nanoscale Fe(3)O(4). Examination of post-exposure magnetite surfaces indicated both Cr(III) and Cr(VI) were present. X-ray magnetic circular dichroism (XMCD) studies at the Fe L(2,3)-edge showed that the amount of Fe(III) "gained" by Cr(VI) reduction could not be entirely accounted for by "lost" Fe(II). Cr L(2,3)-edge XMCD spectra found Cr(III) replaced similar to 14%-20% of octahedral Fe in both biogenic magnetites, producing a layer resembling CrFe(2)O(4). However, schwertmannite-derived biomagnetite was associated with approximately twice as much Cr as ferrihydrite-derived magnetite. Column studies using a gamma-camera to image a (99)mTc(VII) radiotracer were performed to visualize the relative performances of biogenic magnetites at removing aqueous metal oxyanion contaminants. Again, schwertmannite-derived biomagnetite proved capable of retaining more (similar to 20%) (99m)Tc(VII) than ferrihydrite-derived biomagnetite, confirming that the production of biomagnetite can be fine-tuned for efficient environmental remediation through careful selection of the Fe(III) mineral substrate supplied to Fe(III)reducing bacteria.
C1 [Cutting, Richard S.; Coker, Victoria S.; Telling, Neil D.; Kimber, Richard L.; Pearce, Carolyn I.; Van der Laan, Gerrit; Pattrick, Richard A. D.; Vaughan, David J.; Lloyd, Jonathan R.] Univ Manchester, Williamson Res Ctr Mol Environm Sci, Manchester M13 9PL, Lancs, England.
[Cutting, Richard S.; Coker, Victoria S.; Telling, Neil D.; Kimber, Richard L.; Pearce, Carolyn I.; Van der Laan, Gerrit; Pattrick, Richard A. D.; Arenholz, Elke; Lloyd, Jonathan R.] Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester M13 9PL, Lancs, England.
[Ellis, Beverly L.; Lawson, Richard S.] Manchester Royal Infirm, Dept Nucl Med, Manchester M13 9WL, Lancs, England.
[Telling, Neil D.; Van der Laan, Gerrit] Diamond Light Source, Magnet Spect Grp, Didcot OX11 0DE, Oxon, England.
[Arenholz, Elke] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA USA.
RP Cutting, RS (reprint author), Univ Manchester, Williamson Res Ctr Mol Environm Sci, Manchester M13 9PL, Lancs, England.
EM richard.cutting@manchester.ac.uk
RI Coker, Victoria/B-4181-2012; van der Laan, Gerrit/Q-1662-2015
OI van der Laan, Gerrit/0000-0001-6852-2495
FU EPSRC [EP/D058767/1]; BBSRC [BB/E004601/1]; U.S. Department of Energy
[DE-AC02-05CH11231]
FX The support of EPSRC and BBSRC in funding this research is gratefully
acknowledged via grants EP/D058767/1 and BB/E004601/1. Special thanks
are due to Dr. Paul Wincott and Ms. Catherine Davies for advice and
assistance with aspects of the work and to Dr. Joyce McBeth for her
assistance with Tc column studies. The Advanced Light Source is
supported by the Director, Office of Science, Office of Basic Energy
Sciences, of the U.S. Department of Energy under Contract No.
DE-AC02-05CH11231.
NR 54
TC 33
Z9 33
U1 8
U2 52
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0013-936X
J9 ENVIRON SCI TECHNOL
JI Environ. Sci. Technol.
PD APR 1
PY 2010
VL 44
IS 7
BP 2577
EP 2584
DI 10.1021/es902119u
PG 8
WC Engineering, Environmental; Environmental Sciences
SC Engineering; Environmental Sciences & Ecology
GA 574MN
UT WOS:000275993700055
PM 20196588
ER
PT J
AU Borole, AP
Aaron, D
Hamilton, CY
Tsouris, C
AF Borole, Abhijeet P.
Aaron, Doug
Hamilton, Choo Y.
Tsouris, Costas
TI Understanding Long-Term Changes in Microbial Fuel Cell Performance Using
Electrochemical Impedance Spectroscopy
SO ENVIRONMENTAL SCIENCE & TECHNOLOGY
LA English
DT Article
ID INTERNAL RESISTANCE; CATHODE; ANODE; PH; CHALLENGES; LOSSES; EIS
AB Changes in the anode, cathode, and solution/membrane impedances during enrichment of an anode microbial consortium were measured using electrochemical impedance spectroscopy. The consortium was enriched in a compact, flow-through porous electrode chamber coupled to an air-cathode. The anode impedance initially decreased from 296.1 to 36.3 Omega in the first 43 days indicating exoelectrogenic biofilm formation. The external load on the MFC was decreased in a stepwise manner to allow further enrichment. MFC operation at a final load of 50 Omega decreased the anode impedance to 1.4 Omega, with a corresponding cathode and membrane/solution impedance of 12.1 and 3.0 Omega, respectively. An analysis of the capacitive element suggested that most of the three-dimensional anode surface was participating in the bioelectrochemical reaction. The power density of the air-cathode MFC stabilized after 3 months of operation and stayed at 422 +/- 42 mW/m(2) (33 W/m(3)) for the next 3 months. The normalized anode impedance for the MFC was 0.017 k Omega cm(2), a 28-fold reduction over that reported previously. This study demonstrates a unique ability of biological systems to reduce the electron transfer resistance in MFCs, and their potential for stable energy production over extended periods of time.
C1 [Borole, Abhijeet P.] Oak Ridge Natl Lab, BioSci Div, Oak Ridge, TN 37831 USA.
[Tsouris, Costas] Oak Ridge Natl Lab, Nucl Sci & Technol Div, Oak Ridge, TN 37831 USA.
[Aaron, Doug] Georgia Inst Technol, Atlanta, GA 30332 USA.
[Hamilton, Choo Y.] Univ Tennessee, Knoxville, TN 37996 USA.
RP Borole, AP (reprint author), Oak Ridge Natl Lab, BioSci Div, Oak Ridge, TN 37831 USA.
EM borolea@ornl.gov
RI Borole, AP/F-3933-2011; Tsouris, Costas/C-2544-2016;
OI Tsouris, Costas/0000-0002-0522-1027; Borole,
Abhijeet/0000-0001-8423-811X
FU Oak Ridge National Laboratory (ORNL); U.S. Department of Energy [DE
AC05-00OR22725]; American Chemical Society; Petroleum Research Fund;
Green Chemistry Initiative
FX This research was sponsored by the Laboratory Directed Research and
Development Program of Oak Ridge National Laboratory (ORNL), managed by
UT-Battelle, LLC, for the U.S. Department of Energy under Contract No.
DE AC05-00OR22725 and by the American Chemical Society, Petroleum
Research Fund, Green Chemistry Initiative through a grant to Georgia
Institute of Technology.
NR 29
TC 61
Z9 67
U1 6
U2 71
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0013-936X
J9 ENVIRON SCI TECHNOL
JI Environ. Sci. Technol.
PD APR 1
PY 2010
VL 44
IS 7
BP 2740
EP 2744
DI 10.1021/es9032937
PG 5
WC Engineering, Environmental; Environmental Sciences
SC Engineering; Environmental Sciences & Ecology
GA 574MN
UT WOS:000275993700079
PM 20222678
ER
PT J
AU VanEngelen, MR
Field, EK
Gerlach, R
Lee, BD
Apel, WA
Peyton, BM
AF VanEngelen, Michael R.
Field, Erin K.
Gerlach, Robin
Lee, Brady D.
Apel, William A.
Peyton, Brent M.
TI UO22+ SPECIATION DETERMINES URANIUM TOXICITY AND BIOACCUMULATION IN AN
ENVIRONMENTAL PSEUDOMONAS SP ISOLATE
SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
LA English
DT Article
DE Uranium; Low-level waste; Speciation; Toxicity; Bioaccumulation
ID WASTE DISPOSAL SITES; ALGA CHLORELLA SP.; HEAVY-METALS; GREEN-ALGA;
WATER; ACCUMULATION; ADSORPTION; REDUCTION; COMPLEXES; BACTERIA
AB In the present study, experiments were performed to investigate how representative cellulosic breakdown products, when serving as growth substrates under aerobic conditions, affect hexavalent uranyl cation (UO22+) toxicity and bioaccumulation within a Pseudomonas sp. isolate (designated isolate A). Isolate A taken from the Cold Test Pit South (CTPS) region of the Idaho National Laboratory (INL), Idaho Falls, ID, USA. The INL houses low-level uranium-contaminated cellulosic material and understanding how this material, and specifically its breakdown products, affect U-bacterial interactions is important for understanding UO22+ fate and mobility. Toxicity was modeled using a generalized Monod expression. Butyrate, dextrose, ethanol, and lactate served as growth substrates. The potential contribution of bicarbonate species present in high concentrations was also investigated and compared with toxicity and bioaccumulation patterns seen in low-bicarbonate conditions. Isolate A was significantly more sensitive to UO22+ and accumulated significantly more UO22+ in low-bicarbonate concentrations. In addition, UO22+ growth inhibition and bioaccumulation varied depending on the growth substrate. In the presence of high bicarbonate concentrations, sensitivity to UO22+ inhibition was greatly mitigated, and did not vary between the four substrates tested. The extent of UO22+ accumulation was also diminished. The observed patterns were related to UO22+ aqueous complexation, as predicted by MINTEQ (ver. 2.52) (Easton, PA, USA). In the low bicarbonate medium, the presence of positively charged and unstable UO22+-hydroxide complexes explained both the greater sensitivity of isolate A to UO22+, and the ability of isolate A to accumulate significant amounts of UO22+. The exclusive presence of negatively charged and stable UO22+-carbonate complexes in the high hi-carbonate medium explained the diminished sensitivity of isolate A to UO22+ toxicity, and limited ability of isolate A to accumulate UO22+. Environ. Toxicol. Chem. 2010;29:763-769. (C) 2010 SETAC
C1 [VanEngelen, Michael R.; Gerlach, Robin; Peyton, Brent M.] Montana State Univ, Dept Chem & Biol Engn, Bozeman, MT 59717 USA.
[VanEngelen, Michael R.; Field, Erin K.; Gerlach, Robin; Peyton, Brent M.] Montana State Univ, Ctr Biofilm Engn, Bozeman, MT 59717 USA.
[Field, Erin K.] Montana State Univ, Dept Microbiol, Bozeman, MT 59717 USA.
[Lee, Brady D.; Apel, William A.] Idaho Natl Lab, Biol Syst Dept, Idaho Falls, ID 83415 USA.
RP Peyton, BM (reprint author), Montana State Univ, Dept Chem & Biol Engn, Bozeman, MT 59717 USA.
EM bpeyton@coe.montana.edu
RI Gerlach, Robin/A-9474-2012; Peyton, Brent/G-5247-2015
OI Peyton, Brent/0000-0003-0033-0651
FU U.S. Department of Energy, Office of Science [DE-FG02-06ER64206]; U.S.
Department of Energy [DE-AC07-051D14517]
FX The authors at Montana State University gratefully acknowledge the
financial support provided by the U.S. Department of Energy, Office of
Science, Environmental Remediation Science Program (ERSP) contract
DE-FG02-06ER64206. The INL portion of the work was supported by the U.S.
Department of Energy, Assistant Secretary for the Office of Science,
ERSP, under DOE-NE Idaho Operations Office contract number
DE-AC07-051D14517. Laboratory facilities and support were provided by
the Chemical and Biological Engineering Department and the Center for
Biofilm Engineering at Montana State University.
NR 35
TC 13
Z9 14
U1 2
U2 14
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0730-7268
EI 1552-8618
J9 ENVIRON TOXICOL CHEM
JI Environ. Toxicol. Chem.
PD APR
PY 2010
VL 29
IS 4
BP 763
EP 769
DI 10.1002/etc.126
PG 7
WC Environmental Sciences; Toxicology
SC Environmental Sciences & Ecology; Toxicology
GA 582NI
UT WOS:000276604100002
PM 20821504
ER
PT J
AU Swaminathan, S
Ziebert, F
Aranson, IS
Karpeev, D
AF Swaminathan, S.
Ziebert, F.
Aranson, I. S.
Karpeev, D.
TI Patterns and intrinsic fluctuations in semi-dilute motor-filament
systems
SO EPL
LA English
DT Article
ID SELF-ORGANIZATION; MOLECULAR MOTORS; MICROTUBULES; GELS
AB We perform Brownian dynamics simulations of molecular motor-induced ordering and structure formations in semi-dilute cytoskeletal. lament solutions. In contrast to the previously studied dilute case where binary. lament interactions prevail, the semi-dilute regime is characterized by multiple motor-mediated interactions. Moreover, the forces and torques exerted by motors on. laments are intrinsically fluctuating quantities. We incorporate the influences of thermal and motor fluctuations into our model as additive and multiplicative noises, respectively. Numerical simulations reveal that. lament bundles and vortices emerge from a disordered initial state. Subsequent analysis of motor noise effects reveals: i) Pattern formation is very robust against fluctuations in motor force; ii) bundle formation is associated with a significant reduction of the motor fluctuation contributions; iii) the time scale of vortex formation and coalescence decreases with increases in motor noise amplitude. Copyright (C) EPLA, 2010
C1 [Swaminathan, S.] Northwestern Univ, Dept Mat Sci, Evanston, IL 60201 USA.
[Swaminathan, S.; Aranson, I. S.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Ziebert, F.] ESPCI, UMR CNRS Gulliver 7083, F-75231 Paris, France.
[Karpeev, D.] Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA.
RP Swaminathan, S (reprint author), Northwestern Univ, Dept Mat Sci, 2220 Campus Dr, Evanston, IL 60201 USA.
EM sumanthswaminathan2010@u.northwestern.edu
RI Aranson, Igor/I-4060-2013
FU U.S. Department of Energy, Office of Basic Energy Sciences, Division of
Materials Science and Engineering [DEAC02-06CH11357]; Northwestern
University Nonequilibrium Research Center (NERC) [DE-SC0000989]; German
Science Foundation (DFG)
FX This work was supported by the U.S. Department of Energy, Office of
Basic Energy Sciences, Division of Materials Science and Engineering,
under the Contract No. DEAC02-06CH11357. This paper was revised and
redrafted with funding from the Northwestern University Nonequilibrium
Research Center (NERC) - Award No. DE-SC0000989 - with the advisement of
MONICA OLVERA DE LA CRUZ. FZ acknowledges funding by the German Science
Foundation (DFG).
NR 34
TC 3
Z9 3
U1 0
U2 3
PU EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
PI MULHOUSE
PA 6 RUE DES FRERES LUMIERE, MULHOUSE, 68200, FRANCE
SN 0295-5075
J9 EPL-EUROPHYS LETT
JI EPL
PD APR
PY 2010
VL 90
IS 2
AR 28001
DI 10.1209/0295-5075/90/28001
PG 6
WC Physics, Multidisciplinary
SC Physics
GA 615FK
UT WOS:000279119000032
ER
PT J
AU Theodoly, O
Checco, A
Muller, P
AF Theodoly, O.
Checco, A.
Muller, P.
TI Charged diblock copolymers at interfaces: Micelle dissociation upon
compression
SO EPL
LA English
DT Article
ID AIR-WATER-INTERFACE; AIR/WATER INTERFACE; POLYELECTROLYTE BRUSHES;
BLOCK-COPOLYMERS; SURFACE MICELLE; FIELD THEORY; MONOLAYERS;
AGGREGATION; SIMULATIONS; OXIDE)
AB We use grazing incidence X-ray scattering to study the surface micellization of charged amphiphilic diblock copolymers poly(styrene-block-acrylic acid) at the air-water interface. Scattering interference peaks are consistent with the formation of hexagonally packed micelles. The remarkable increase of inter-micelle distance upon compression is explained by a dissociation of micelles into a brush. Hence, surface micelles reorganize, whereas micelles of the same copolymers in solutions are "frozen". We show indeed that the energetic cost of unimer extraction from micelles is much lower for surface than for solution. Finally, a model combining electrostatic interactions and micelle/brush equilibrium explains surface pressure vs. area without free parameters. Copyright (C) EPLA, 2010
C1 [Theodoly, O.; Muller, P.] CNRS, UMR 166, Complex Fluids Lab, Bristol, PA 19007 USA.
[Theodoly, O.] CNRS, INSERM, U600, Lab Adhes & Inflammat,UMR 6212, F-13009 Marseille, France.
[Theodoly, O.] Aix Marseille Univ, Fac Sci Med Pharm, F-13000 Marseille, France.
[Checco, A.] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA.
[Muller, P.] Univ Strasbourg, Inst Charles Sadron, CNRS, UPR 22, F-67034 Strasbourg 2, France.
RP Theodoly, O (reprint author), CNRS, UMR 166, Complex Fluids Lab, 350 George Patterson Blvd, Bristol, PA 19007 USA.
EM pierre.muller@ics-cnrs.unistra.fr
RI Muller, Pierre/D-2352-2010; theodoly, olivier/P-5402-2016
OI Muller, Pierre/0000-0002-5779-9146;
FU Rhodia Inc.; U.S. Department of Energy, the Office of Basic Energy
Sciences, and the Division of Materials Sciences and Engineering
[DE-AC02-98CH10886]
FX The authors acknowledge valuable discussions with C. Marques and B.
OCKO. The work was supported by Rhodia Inc. and, for the part performed
at Brookhaven National Laboratory, by the U.S. Department of Energy, the
Office of Basic Energy Sciences, and the Division of Materials Sciences
and Engineering under award DE-AC02-98CH10886.
NR 40
TC 1
Z9 1
U1 0
U2 11
PU EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
PI MULHOUSE
PA 6 RUE DES FRERES LUMIERE, MULHOUSE, 68200, FRANCE
SN 0295-5075
J9 EPL-EUROPHYS LETT
JI EPL
PD APR
PY 2010
VL 90
IS 2
AR 28004
DI 10.1209/0295-5075/90/28004
PG 6
WC Physics, Multidisciplinary
SC Physics
GA 615FK
UT WOS:000279119000035
ER
PT J
AU Radakovits, R
Jinkerson, RE
Darzins, A
Posewitz, MC
AF Radakovits, Randor
Jinkerson, Robert E.
Darzins, Al
Posewitz, Matthew C.
TI Genetic Engineering of Algae for Enhanced Biofuel Production
SO EUKARYOTIC CELL
LA English
DT Review
ID DIATOM PHAEODACTYLUM-TRICORNUTUM; ADP-GLUCOSE PYROPHOSPHORYLASE;
EXPRESSED SEQUENCE TAGS; ACID BETA-OXIDATION; CHLOROPHYLL ANTENNA SIZE;
SEED OIL CONTENT; STABLE NUCLEAR TRANSFORMATION; CARRIER PROTEIN
THIOESTERASE; BINDING CASSETTE TRANSPORTER; CYANIDIOSCHYZON-MEROLAE 10D
AB There are currently intensive global research efforts aimed at increasing and modifying the accumulation of lipids, alcohols, hydrocarbons, polysaccharides, and other energy storage compounds in photosynthetic organisms, yeast, and bacteria through genetic engineering. Many improvements have been realized, including increased lipid and carbohydrate production, improved H(2) yields, and the diversion of central metabolic intermediates into fungible biofuels. Photosynthetic microorganisms are attracting considerable interest within these efforts due to their relatively high photosynthetic conversion efficiencies, diverse metabolic capabilities, superior growth rates, and ability to store or secrete energy-rich hydrocarbons. Relative to cyanobacteria, eukaryotic microalgae possess several unique metabolic attributes of relevance to biofuel production, including the accumulation of significant quantities of triacylglycerol; the synthesis of storage starch (amylopectin and amylose), which is similar to that found in higher plants; and the ability to efficiently couple photosynthetic electron transport to H(2) production. Although the application of genetic engineering to improve energy production phenotypes in eukaryotic microalgae is in its infancy, significant advances in the development of genetic manipulation tools have recently been achieved with microalgal model systems and are being used to manipulate central carbon metabolism in these organisms. It is likely that many of these advances can be extended to industrially relevant organisms. This review is focused on potential avenues of genetic engineering that may be undertaken in order to improve microalgae as a biofuel platform for the production of biohydrogen, starch-derived alcohols, diesel fuel surrogates, and/or alkanes.
C1 [Radakovits, Randor; Jinkerson, Robert E.; Posewitz, Matthew C.] Colorado Sch Mines, Dept Chem & Geochem, Golden, CO 80401 USA.
[Darzins, Al] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Posewitz, MC (reprint author), Colorado Sch Mines, Dept Chem & Geochem, Golden, CO 80401 USA.
EM mposewit@mines.edu
RI James, Gabriel/F-7739-2011
FU Air Force Office of Scientific Research [FA9550-05-1-0365]; Office of
Biological and Environmental Research, Office of Science, U.S.
Department of Energy
FX We acknowledge support from the Air Force Office of Scientific Research
grant FA9550-05-1-0365 and the Office of Biological and Environmental
Research, GTL program, Office of Science, U.S. Department of Energy.
NR 216
TC 377
Z9 398
U1 44
U2 444
PU AMER SOC MICROBIOLOGY
PI WASHINGTON
PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA
SN 1535-9778
J9 EUKARYOT CELL
JI Eukaryot. Cell
PD APR
PY 2010
VL 9
IS 4
BP 486
EP 501
DI 10.1128/EC.00364-09
PG 16
WC Microbiology; Mycology
SC Microbiology; Mycology
GA 579KR
UT WOS:000276369600002
PM 20139239
ER
PT J
AU Morelhao, SL
Coelho, PG
Honnicke, MG
AF Morelhao, Sergio L.
Coelho, Paulo G.
Honnicke, Marcelo G.
TI Synchrotron X-ray imaging via ultra-small-angle scattering: principles
of quantitative analysis and application in studying bone integration to
synthetic grafting materials
SO EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
LA English
DT Article
DE Synchrotron; Ultra-small-angle scattering; Bone; Grafting material; In
vivo
ID RADIOGRAPHY
AB Optimized experimental conditions for extracting accurate information at subpixel length scales from analyzer-based X-ray imaging were obtained and applied to investigate bone regeneration by means of synthetic beta-TCP grafting materials in a rat calvaria model. The results showed a 30% growth in the particulate size due to bone ongrowth/ingrowth within the critical size defect over a 1-month healing period.
C1 [Coelho, Paulo G.] NYU, Dept Biomat & Biomimet, New York, NY 10012 USA.
[Morelhao, Sergio L.] Univ Sao Paulo, Inst Fis, BR-01498 Sao Paulo, Brazil.
[Honnicke, Marcelo G.] Brookhaven Natl Lab, NSLS II, Upton, NY 11973 USA.
RP Coelho, PG (reprint author), NYU, Dept Biomat & Biomimet, New York, NY 10012 USA.
EM morelhao@if.usp.br; pgcoelho@nyu.edu; mhonnicke@bnl.gov
RI Morelhao, Sergio L./G-2947-2012; Honnicke, Marcelo/I-8624-2012
OI Morelhao, Sergio L./0000-0003-1643-0948;
FU U.S. Department of Energy [DE-AC02-98CH10886]; NIH [R01 AR48292]
FX The authors gratefully acknowledge Z. Zhong for valuable discussions and
Dean Connor Jr. for the expert technical assistance. Research was
supported by the Brazilian agency FAPESP and CNPq. Use of the X15A
beamline was supported by the U.S. Department of Energy contract no.
DE-AC02-98CH10886 and by NIH grant R01 AR48292.
NR 20
TC 3
Z9 4
U1 0
U2 5
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0175-7571
J9 EUR BIOPHYS J BIOPHY
JI Eur. Biophys. J. Biophys. Lett.
PD APR
PY 2010
VL 39
IS 5
BP 861
EP 865
DI 10.1007/s00249-009-0541-y
PG 5
WC Biophysics
SC Biophysics
GA 576FR
UT WOS:000276130200011
PM 19784835
ER
PT J
AU Signorini, C
Pierroutsakou, D
Martin, B
Mazzocco, M
Glodariu, T
Bonetti, R
Guglielmetti, A
La Commara, M
Romoli, M
Sandoli, M
Vardaci, E
Esbensen, H
Farinon, F
Molini, P
Parascandolo, C
Soramel, F
Sidortchuk, S
Stroe, L
AF Signorini, C.
Pierroutsakou, D.
Martin, B.
Mazzocco, M.
Glodariu, T.
Bonetti, R.
Guglielmetti, A.
La Commara, M.
Romoli, M.
Sandoli, M.
Vardaci, E.
Esbensen, H.
Farinon, F.
Molini, P.
Parascandolo, C.
Soramel, F.
Sidortchuk, S.
Stroe, L.
TI Interaction of F-17 with a Pb-208 target below the Coulomb barrier
SO EUROPEAN PHYSICAL JOURNAL A
LA English
DT Article
ID ELASTIC-SCATTERING; HALO NUCLEI; FUSION; THRESHOLD; ENERGIES; SYSTEM;
BREAKUP; BEAMS
AB The interaction of loosely bound (S-p = 600 keV) F-17 ions with a Pb-208 target was studied at E-lab = 86MeV, below the Coulomb barrier, by measuring the differential cross-section for the quasielastic scattering and the cross-section for the exclusive breakup process F-17 -> O-16 + p. The small reaction and exclusive breakup cross-sections confirm the small reactivity of this system, even at low energy, and indicates that the F-17 small binding energy plays a minor role in the reaction dynamics.
C1 [Signorini, C.; Mazzocco, M.; Molini, P.; Soramel, F.] Dept Phys, I-35129 Padua, Italy.
[Signorini, C.; Mazzocco, M.; Molini, P.; Soramel, F.] Ist Nazl Fis Nucl, I-35129 Padua, Italy.
[Pierroutsakou, D.; Romoli, M.] Ist Nazl Fis Nucl, Sez Napoli, I-80126 Naples, Italy.
[Martin, B.; La Commara, M.; Sandoli, M.; Vardaci, E.; Parascandolo, C.] Dept Phys Sci, I-80126 Naples, Italy.
[Glodariu, T.; Stroe, L.] NIPNE, Magurele 077125, Romania.
[Bonetti, R.; Guglielmetti, A.] Dept Phys, I-20133 Milan, Italy.
[Bonetti, R.; Guglielmetti, A.] Ist Nazl Fis Nucl, I-20133 Milan, Italy.
[Esbensen, H.] ANL Phys Div, Argonne, IL 60439 USA.
[Farinon, F.] GSI Darmstadt, D-64291 Darmstadt, Germany.
[Sidortchuk, S.] Joint Inst Nucl Res, FLNR, Dubna 141980, Moscow Region, Russia.
RP Signorini, C (reprint author), Dept Phys, Via Marzolo 8, I-35129 Padua, Italy.
EM signorini@pd.infn.it
RI Glodariu, Tudor/F-6676-2011; Mazzocco, Marco/J-4393-2012; Stroe,
Lucian/A-3290-2009
OI Stroe, Lucian/0000-0002-9306-3937
FU CNCSIS-UEFISCSU; EURONS program; US Department of Energy, Office of
Nuclear Physics [DE-AC02-06CH113457]; [181/2007]; [PNCDI-2-ID 363]
FX T. G. and L. S. acknowledge a partial financial support in the frame of
the contract 181/2007, PNCDI-2-ID 363, CNCSIS-UEFISCSU. The support in
the frame of the EURONS program is also gratefully acknowledged. H. E is
supported by the US Department of Energy, Office of Nuclear Physics,
under the Contract No. DE-AC02-06CH113457.
NR 25
TC 13
Z9 13
U1 0
U2 2
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1434-6001
J9 EUR PHYS J A
JI Eur. Phys. J. A
PD APR
PY 2010
VL 44
IS 1
BP 63
EP 69
DI 10.1140/epja/i2010-10934-x
PG 7
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 580HM
UT WOS:000276438700007
ER
PT J
AU Huang, F
Sibirtsev, A
Haidenbauer, J
Krewald, S
Meissner, UG
AF Huang, F.
Sibirtsev, A.
Haidenbauer, J.
Krewald, S.
Meissner, U. -G.
TI Backward pion-nucleon scattering
SO EUROPEAN PHYSICAL JOURNAL A
LA English
DT Article
ID P ELASTIC-SCATTERING; 10 GEV-C; LARGE-ANGLE SCATTERING; COMPLEX
REGGE-POLES; POLARIZATION PARAMETER; BARYON-EXCHANGE; CHARGE-EXCHANGE;
NEGATIVE PIONS; CROSS-SECTION; HIGH ENERGIES
AB A global analysis of the world data on differential cross-sections and polarization asymmetries of backward pion-nucleon scattering for invariant collision energies above 3 GeV is performed in a Regge model. Including the N alpha, N(gamma), Delta(delta) and Delta(beta) trajectories, we reproduce both angular distributions and polarization data for small values of the Mandelstam variable u, in contrast to previous analyses. The model amplitude is used to obtain evidence for baryon resonances with mass below 3 GeV. Our analysis suggests a G(39)-resonance with a mass of 2.83 GeV as member of the Delta(beta)-trajectory from the corresponding Chew-Frautschi plot.
C1 [Huang, F.] Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA.
[Sibirtsev, A.; Meissner, U. -G.] Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theorie, D-53115 Bonn, Germany.
[Sibirtsev, A.; Meissner, U. -G.] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany.
[Sibirtsev, A.] Thomas Jefferson Natl Accelerator Facil, Excited Baryon Anal Ctr, Newport News, VA 23606 USA.
[Haidenbauer, J.; Krewald, S.; Meissner, U. -G.] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany.
[Haidenbauer, J.; Krewald, S.; Meissner, U. -G.] Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany.
[Haidenbauer, J.; Krewald, S.; Meissner, U. -G.] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany.
RP Huang, F (reprint author), Univ Georgia, Dept Phys & Astron, Athens, GA 30602 USA.
EM j.haidenbauer@fz-juelich.de
RI Huang, Fei/C-4081-2013;
OI Huang, Fei/0000-0002-6258-7455; Krewald, Siegfried/0000-0002-8596-8429
NR 64
TC 9
Z9 9
U1 0
U2 1
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1434-6001
J9 EUR PHYS J A
JI Eur. Phys. J. A
PD APR
PY 2010
VL 44
IS 1
BP 81
EP 92
DI 10.1140/epja/i2010-10930-2
PG 12
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 580HM
UT WOS:000276438700010
ER
PT J
AU Li, HF
Su, Y
Chatterji, T
Nefedov, A
Persson, J
Meuffels, P
Xiao, Y
Vaknin, D
Bruckel, T
AF Li, H. -F.
Su, Y.
Chatterji, Tapan
Nefedov, A.
Persson, J.
Meuffels, P.
Xiao, Y.
Vaknin, D.
Brueckel, Th.
TI Soft X-ray resonant scattering study of single-crystal LaSr2Mn2O7
SO EUROPEAN PHYSICAL JOURNAL B
LA English
DT Article
ID CHARGE; DIFFRACTION; MANGANITES; INTERPLAY; SPIN
AB Soft X-ray resonant scattering studies at the Mn L-II,L- III- and the La M-IV,M- V- edges of single-crystal LaSr2Mn2O7 are reported. At low temperatures, below T-N a parts per thousand 160 K, energy scans with a fixed momentum transfer at the A-type antiferromagnetic (0 0 1) reflection around the Mn L-II,L- III-edges with incident linear sigma and pi polarizations show strong resonant enhancements. The splitting of the energy spectra around the Mn L-II,L- III-edges may indicate the presence of a mixed valence state, e.g., Mn3+/Mn4+. The relative intensities of the resonance and the clear shoulder-feature as well as the strong incident sigma and pi polarization dependences strongly indicate its complex electronic origin. Unexpected enhancement of the charge Bragg (0 0 2) reflection at the La M-IV,M- V-edges with sigma polarization has been observed up to 300 K, with an anomaly appearing around the orbital-ordering transition temperature, T-OO a parts per thousand 220 K, suggesting a strong coupling (competition) between them.
C1 [Li, H. -F.; Su, Y.; Chatterji, Tapan; Persson, J.; Meuffels, P.; Xiao, Y.; Brueckel, Th.] Forschungszentrum Julich GmbH, Inst Festkorperforsch, D-52425 Julich, Germany.
[Chatterji, Tapan] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France.
[Nefedov, A.] Ruhr Univ Bochum, Inst Expt Phys Festkorperphys, D-44780 Bochum, Germany.
[Li, H. -F.; Vaknin, D.] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
[Li, H. -F.; Vaknin, D.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
RP Li, HF (reprint author), Forschungszentrum Julich GmbH, Inst Festkorperforsch, D-52425 Julich, Germany.
EM h.f.li@hotmail.com
RI Li, Haifeng/F-9743-2013; Bruckel, Thomas/J-2968-2013; Xiao,
Yinguo/N-9069-2015; Vaknin, David/B-3302-2009;
OI Bruckel, Thomas/0000-0003-1378-0416; Vaknin, David/0000-0002-0899-9248;
Chatterji, Tapan/0000-0002-2303-8904
FU BMBF [O3ZA6BC2]
FX We are grateful for the excellent technical support from BESSY-II,
Germany. This work was partially supported by the BMBF under contract
No. O3ZA6BC2.
NR 18
TC 1
Z9 1
U1 4
U2 9
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1434-6028
J9 EUR PHYS J B
JI Eur. Phys. J. B
PD APR
PY 2010
VL 74
IS 4
BP 457
EP 461
DI 10.1140/epjb/e2010-00117-3
PG 5
WC Physics, Condensed Matter
SC Physics
GA 586IK
UT WOS:000276900000005
ER
PT J
AU De Roeck, A
Ellis, J
Grojean, C
Heinemeyer, S
Jakobs, K
Weiglein, G
Wells, J
Azuelos, G
Dawson, S
Gripaios, B
Han, T
Hewett, J
Lancaster, M
Mariotti, C
Moortgat, F
Moortgat-Pick, G
Polesello, G
Riemann, S
Schumacher, M
Assamagan, K
Bechtle, P
Carena, M
Chachamis, G
Chen, KF
De Curtis, S
Desch, K
Dittmar, M
Dreiner, H
Duhrssen, M
Foster, B
Frandsen, MT
Giammanco, A
Godbole, R
Gopalakrishna, S
Govoni, P
Gunion, J
Hollik, W
Hou, WS
Isidori, G
Juste, A
Kalinowski, J
Korytov, A
Kou, E
Kraml, S
Krawczyk, M
Martin, A
Milstead, D
Morton-Thurtle, V
Moenig, K
Mele, B
Ozcan, E
Pieri, M
Plehn, T
Reina, L
Richter-Was, E
Rizzo, T
Rolbiecki, K
Sannino, F
Schram, M
Smillie, J
Sultansoy, S
Tattersall, J
Uwer, P
Webber, B
Wienemann, P
AF De Roeck, A.
Ellis, J.
Grojean, C.
Heinemeyer, S.
Jakobs, K.
Weiglein, G.
Wells, J.
Azuelos, G.
Dawson, S.
Gripaios, B.
Han, T.
Hewett, J.
Lancaster, M.
Mariotti, C.
Moortgat, F.
Moortgat-Pick, G.
Polesello, G.
Riemann, S.
Schumacher, M.
Assamagan, K.
Bechtle, P.
Carena, M.
Chachamis, G.
Chen, K. F.
De Curtis, S.
Desch, K.
Dittmar, M.
Dreiner, H.
Duehrssen, M.
Foster, B.
Frandsen, M. T.
Giammanco, A.
Godbole, R.
Gopalakrishna, S.
Govoni, P.
Gunion, J.
Hollik, W.
Hou, W. S.
Isidori, G.
Juste, A.
Kalinowski, J.
Korytov, A.
Kou, E.
Kraml, S.
Krawczyk, M.
Martin, A.
Milstead, D.
Morton-Thurtle, V.
Moenig, K.
Mele, B.
Ozcan, E.
Pieri, M.
Plehn, T.
Reina, L.
Richter-Was, E.
Rizzo, T.
Rolbiecki, K.
Sannino, F.
Schram, M.
Smillie, J.
Sultansoy, S.
Tattersall, J.
Uwer, P.
Webber, B.
Wienemann, P.
TI From the LHC to future colliders
SO EUROPEAN PHYSICAL JOURNAL C
LA English
DT Review
ID LARGE HADRON COLLIDER; ELECTROWEAK SYMMETRY-BREAKING; HIGGS-BOSON
PRODUCTION; EFFECTIVE-FIELD THEORY; ULTRA HEAVY FERMIONS; LINEAR
COLLIDER; STANDARD-MODEL; CERN LHC; TAU-POLARIZATION; NEUTRINO MASSES
AB Discoveries at the LHC will soon set the physics agenda for future colliders. This report of a CERN Theory Institute includes the summaries of Working Groups that reviewed the physics goals and prospects of LHC running with 10 to 300 fb(-1) of integrated luminosity, of the proposed sLHC luminosity upgrade, of the ILC, of CLIC, of the LHeC and of a muon collider. The four Working Groups considered possible scenarios for the first 10 fb(-1) of data at the LHC in which (i) a state with properties that are compatible with a Higgs boson is discovered, (ii) no such state is discovered either because the Higgs properties are such that it is difficult to detect or because no Higgs boson exists, (iii) a missing-energy signal beyond the Standard Model is discovered as in some supersymmetric models, and (iv) some other exotic signature of new physics is discovered. In the contexts of these scenarios, the Working Groups reviewed the capabilities of the future colliders to study in more detail whatever new physics may be discovered by the LHC. Their reports provide the particle physics community with some tools for reviewing the scientific priorities for future colliders after the LHC produces its first harvest of new physics from multi-TeV collisions.
C1 [De Roeck, A.; Ellis, J.; Grojean, C.; Wells, J.; Gripaios, B.; Dittmar, M.] CERN, Dept Phys, Geneva, Switzerland.
[De Roeck, A.] Univ Antwerp, Antwerp, Belgium.
[Grojean, C.] CEA, Saclay, France.
[Heinemeyer, S.] CSIC UC, Inst Fis Cantabria, Santander, Spain.
[Jakobs, K.; Duehrssen, M.] Univ Freiburg, Inst Phys, Freiburg, Germany.
[Weiglein, G.; Moortgat-Pick, G.; Morton-Thurtle, V.; Rolbiecki, K.; Smillie, J.; Tattersall, J.] Univ Durham, IPPP, Durham, England.
[Azuelos, G.] Univ Montreal, Montreal, PQ, Canada.
[Azuelos, G.] TRIUMF, Vancouver, BC V6T 2A3, Canada.
[Dawson, S.; Assamagan, K.; Gopalakrishna, S.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
[Han, T.] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA.
[Hewett, J.; Rizzo, T.] SLAC Natl Accelerator Lab, Menlo Pk, CA USA.
[Lancaster, M.; Ozcan, E.] UCL, London, England.
[Mariotti, C.] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy.
[Moortgat, F.] ETH Honggerberg, Dept Phys, CH-8093 Zurich, Switzerland.
[Polesello, G.] Ist Nazl Fis Nucl, Sez Pavia, I-27100 Pavia, Italy.
[Moenig, K.] DESY, Zeuthen, Germany.
[Riemann, S.; Bechtle, P.] DESY, D-2000 Hamburg, Germany.
[Carena, M.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Chachamis, G.] Paul Scherrer Inst, Villigen, Switzerland.
[Chen, K. F.; Hou, W. S.] Natl Taiwan Univ, Dept Phys, Taipei, Taiwan.
[De Curtis, S.] Ist Nazl Fis Nucl, Sez Firenze, Florence, Italy.
[De Curtis, S.] Univ Florence, Dept Phys, I-50121 Florence, Italy.
[Desch, K.; Dreiner, H.; Wienemann, P.] Univ Bonn, Inst Phys, D-5300 Bonn, Germany.
[Dreiner, H.] Univ Bonn, Bethe Ctr Theoret Phys, Bonn, Germany.
[Frandsen, M. T.; Sannino, F.] Univ So Denmark, Origins CP3, Odense, Denmark.
[Frandsen, M. T.] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford, England.
[Giammanco, A.] Catholic Univ Louvain, CP3, B-3000 Louvain, Belgium.
[Godbole, R.] Indian Inst Sci, Ctr High Energy Phys, Bangalore 560012, Karnataka, India.
[Govoni, P.] INFN Milano Bicocca, Milan, Italy.
[Govoni, P.] Univ Milan, Milan, Italy.
[Gunion, J.] Univ Calif Davis, Dept Phys, Davis, CA USA.
[Hollik, W.] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany.
[Isidori, G.] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy.
[Kalinowski, J.; Krawczyk, M.] Univ Warsaw, Dept Phys, Warsaw, Poland.
[Korytov, A.] Univ Florida, Gainesville, FL USA.
[Kou, E.] Univ Paris 11, Lab Accelerateur Lineaire, Orsay, France.
[Kraml, S.] UJF Grenoble 1, CNRS, LPSC, IN2P3, Grenoble, France.
[Martin, A.] Yale Univ, Dept Phys, Sloane Lab, New Haven, CT USA.
[Milstead, D.] Stockholms Univ, Stockholm, Sweden.
[Mele, B.] Ist Nazl Fis Nucl, Sez Roma, Rome, Italy.
[Mele, B.] Univ Roma La Sapienza, Rome, Italy.
[Pieri, M.] Univ Calif San Diego, San Diego, CA 92103 USA.
[Plehn, T.] Heidelberg Univ, Inst Theoret Phys, D-6900 Heidelberg, Germany.
[Reina, L.] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA.
[Richter-Was, E.] Jagellonian Univ, Inst Phys, Krakow, Poland.
[Richter-Was, E.] IFJ PAN, Inst Nucl Phys, Krakow, Poland.
[Schram, M.] McGill Univ, Montreal, PQ, Canada.
[Sultansoy, S.] TOBB Univ Econ & Technol, Div Phys, Ankara, Turkey.
[Uwer, P.] Humboldt Univ, Inst Phys, Berlin, Germany.
[Webber, B.] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England.
[Foster, B.] Univ Oxford, Oxford, England.
RP De Roeck, A (reprint author), CERN, Dept Phys, Geneva, Switzerland.
EM christophe.grojean@cern.ch
RI Krawczyk, Maria/B-3184-2012; Govoni, Pietro/K-9619-2016; Rolbiecki,
Krzysztof/A-5402-2017; Chachamis, Grigorios/B-3351-2017; Juste,
Aurelio/I-2531-2015;
OI Sannino, Francesco/0000-0003-2361-5326; grojean,
christophe/0000-0002-7196-7361; Govoni, Pietro/0000-0002-0227-1301;
Rolbiecki, Krzysztof/0000-0002-9645-9670; Chachamis,
Grigorios/0000-0003-0347-0879; Mele, Barbara/0000-0002-9912-442X;
Lancaster, Mark/0000-0002-8872-7292; Webber, Bryan/0000-0001-7474-0990;
Juste, Aurelio/0000-0002-1558-3291; Dawson, Sally/0000-0002-5598-695X;
Han, Tao/0000-0002-5543-0716
FU CERN TH unit; 'MassTeV' ERC [226371]; European Community
[MRTN-CT-2006-035505, MRTN-CT-2006-035657]; DOE [DE-FGO2-96-ER40956];
U.S. Department of Energy [DE-AC02-76SF00515]; Science and Technology
Facilities Council, UK
FX The CERN TH Institute has been funded by the CERN TH unit and by
'MassTeV' ERC advanced grant 226371. This work has been supported in
part by the European Community's Marie-Curie Research Training Network
under contract MRTN-CT-2006-035505 'Tools and Precision Calculations for
Physics Discoveries at Colliders' (HEPTOOLS) and MRTN-CT-2006-035657
'Understanding the Electroweak Symmetry Breaking and the Origin of Mass
using the First Data of ATLAS' (ARTEMIS). This work was supported in
part by the DOE under Task TeV of contract DE-FGO2-96-ER40956. J.H. and
T.R. were supported by the U.S. Department of Energy under Contract
DE-AC02-76SF00515. M.L. was supported by the Science and Technology
Facilities Council, UK.
NR 287
TC 33
Z9 33
U1 0
U2 12
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1434-6044
J9 EUR PHYS J C
JI Eur. Phys. J. C
PD APR
PY 2010
VL 66
IS 3-4
BP 525
EP 583
DI 10.1140/epjc/s10052-010-1244-3
PG 59
WC Physics, Particles & Fields
SC Physics
GA 580VZ
UT WOS:000276479900015
ER
PT J
AU Song, B
Antoun, BR
Nie, X
Chen, W
AF Song, B.
Antoun, B. R.
Nie, X.
Chen, W.
TI High-rate Characterization of 304L Stainless Steel at Elevated
Temperatures for Recrystallization Investigation
SO EXPERIMENTAL MECHANICS
LA English
DT Article
DE Split Hopkinson pressure bar (SHPB); Elevated temperature; 304L
stainless steel; Dynamic response; Recrystallization
ID HOPKINSON PRESSURE BAR; STRAIN RATE; SHPB; SPECIMENS; FLOW
AB An integrated experimental technique was developed for high-rate mechanical characterization of 304L stainless steel at elevated temperatures by using a modified split Hopkinson pressure bar (SHPB). A sandwich structure consisting of two platens and the specimen in between was heated before mechanical loading while the bars were maintained at room temperature to eliminate the temperature gradient effect on the wave propagation in the bars. Upon contacting the cold bars, temperature gradients form in the platens, leaving the temperature in specimen constant and uniform. Pulse shaping techniques were employed to maintain constant strain-rate deformation and dynamic stress equilibrium in the specimen. Dynamic compressive stress-strain curves at elevated temperatures for the 304L stainless steel were obtained. To relate recrystallization to impact loading, a momentum trapping system was employed to apply a single loading on the specimen during one dynamic experiment. We also controlled the quenching time to study its effect on recrystallization.
C1 [Song, B.; Antoun, B. R.] Sandia Natl Labs, Livermore, CA 94551 USA.
[Nie, X.; Chen, W.] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA.
[Chen, W.] Purdue Univ, Sch Aeronaut & Astronaut, W Lafayette, IN 47907 USA.
RP Song, B (reprint author), Sandia Natl Labs, Livermore, CA 94551 USA.
EM bsong@sandia.gov
RI Song, Bo/D-3945-2011
FU Sandia National Laboratories; Sandia Corporation; Lockheed Martin
Company; United States Department of Energy [DE-AC04-91AL85000]
FX The authors would like to thank Dr. Chul Jin Syn for his assistance in
dynamic experiments. This work was performed at Purdue University and
supported by Sandia National Laboratories. Sandia National Laboratories
is operated by Sandia Corporation, a Lockheed Martin Company, for the
United States Department of Energy under Contract DE-AC04-91AL85000.
NR 22
TC 5
Z9 5
U1 1
U2 7
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0014-4851
J9 EXP MECH
JI Exp. Mech.
PD APR
PY 2010
VL 50
IS 4
BP 553
EP 560
DI 10.1007/s11340-009-9253-6
PG 8
WC Materials Science, Multidisciplinary; Mechanics; Materials Science,
Characterization & Testing
SC Materials Science; Mechanics
GA 568TY
UT WOS:000275547000013
ER
PT J
AU Berman, HM
Westbrook, J
Gabanyi, M
Tao, YP
Shah, R
Schwede, T
Arnold, K
Kiefer, F
Bordoli, L
Adams, P
Carter, L
Minor, W
LaBaer, J
AF Berman, Helen M.
Westbrook, John
Gabanyi, Margaret
Tao, Yi-Ping
Shah, Raship
Schwede, Torsten
Arnold, Konstantin
Kiefer, Florian
Bordoli, Lorenza
Adams, Paul
Carter, Lester
Minor, Wladek
LaBaer, Joshua
TI HOW TO USE THE PSI STRUCTURAL GENOMICS KNOWLEDGEBASE TO ENABLE RESEARCH
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Berman, Helen M.; Westbrook, John; Gabanyi, Margaret; Tao, Yi-Ping; Shah, Raship] Rutgers State Univ, Piscataway, NJ USA.
[Schwede, Torsten; Arnold, Konstantin; Kiefer, Florian; Bordoli, Lorenza] Univ Basel, Swiss Inst Bioinformat, Basel, Switzerland.
[Adams, Paul; Carter, Lester] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
[Minor, Wladek] Univ Virginia, Dept Mol Physiol & Biol Phys, Charlottesville, VA USA.
[LaBaer, Joshua] Arizone State Univ, Biodesign Inst, Tempe, AZ USA.
RI Minor, Wladek/F-3096-2014; Carter, Lester/G-6561-2014
NR 0
TC 0
Z9 0
U1 0
U2 0
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675506688
ER
PT J
AU Borgaro, J
Liu, L
Hooker, J
Tonge, P
AF Borgaro, Janine
Liu, Li
Hooker, Jacob
Tonge, Peter
TI The Use of Short lived Isotopes for Exploring Drug Binding Partners of
Isoniazid in Mycobacterium Tuberculosis
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Borgaro, Janine; Liu, Li; Tonge, Peter] SUNY Stony Brook, Stony Brook, NY 11794 USA.
[Hooker, Jacob] Brookhaven Natl Lab, Upton, NY 11973 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675504192
ER
PT J
AU Cheng, KC
Clark, DP
Thomas, GK
Canada, B
Peckins, S
Cheng, AM
Barno, E
Copper, J
Tatiparthi, A
Sledz, T
Canfield, V
Xiao, XH
deCarlo, F
La Riviere, P
Liu, YX
Wang, JZ
Amsterdam, A
Hopkins, N
AF Cheng, Keith C.
Clark, Darin P.
Thomas, Georgia K.
Canada, Brian
Peckins, Steven
Cheng, Anthony M.
Barno, Eileen
Copper, Jean
Tatiparthi, Arun
Sledz, Timothy
Canfield, Victor
Xiao, Xianghui
deCarlo, Francesco
La Riviere, Patrick
Liu, Yanxi
Wang, James Z.
Amsterdam, Adam
Hopkins, Nancy
TI Morphogenetic Profiles in Micron Length Scales for Genetics and Systems
Biology
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Cheng, Keith C.; Canfield, Victor] Penn State Coll Med, Hershey, PA USA.
[Clark, Darin P.; Peckins, Steven; Barno, Eileen; Copper, Jean] Penn State Coll Med, Jake Gittlen Canc Res Fdn, Hershey, PA USA.
[Thomas, Georgia K.] Penn State Coll Med, Cell & Mol Biol Grad Program, Hershey, PA USA.
[Canada, Brian] Penn State Univ, Grad Program Bioinformat & Genom, Hershey, PA USA.
[Cheng, Anthony M.] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA.
[Tatiparthi, Arun; Sledz, Timothy] Microphoton, Allentown, PA USA.
[Xiao, Xianghui; deCarlo, Francesco] Argonne Natl Labs, Argonne, IL USA.
[La Riviere, Patrick] Univ Chicago, Chicago, IL 60637 USA.
[Liu, Yanxi; Wang, James Z.] Penn State Univ, University Pk, PA 16802 USA.
[Amsterdam, Adam; Hopkins, Nancy] MIT, Boston, MA USA.
NR 0
TC 0
Z9 0
U1 0
U2 2
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675506758
ER
PT J
AU Cong, Y
Baker, ML
Jakana, J
Woolford, D
Miller, EJ
Reissmann, S
Kumar, RN
Redding-Johanson, AM
Batth, TS
Mukhopadhyay, A
Ludtke, SJ
Frydman, J
Chiu, W
AF Cong, Yao
Baker, Matthew L.
Jakana, Joanita
Woolford, David
Miller, Erik J.
Reissmann, Stefanie
Kumar, Ramya N.
Redding-Johanson, Alyssa M.
Batth, Tanveer S.
Mukhopadhyay, Aindrila
Ludtke, Steven J.
Frydman, Judith
Chiu, Wah
TI 4.0 angstrom Resolution Cryo-EM Structure of the Mammalian Chaperonin
TRiC/CCT Reveals its Unique Subunit Arrangement
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Cong, Yao; Baker, Matthew L.; Jakana, Joanita; Woolford, David; Ludtke, Steven J.; Chiu, Wah] Baylor Coll Med, Houston, TX 77030 USA.
[Miller, Erik J.; Reissmann, Stefanie; Kumar, Ramya N.; Frydman, Judith] Stanford Univ, Stanford, CA 94305 USA.
[Redding-Johanson, Alyssa M.; Batth, Tanveer S.; Mukhopadhyay, Aindrila] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
NR 0
TC 0
Z9 0
U1 1
U2 1
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675504142
ER
PT J
AU DeJongh, M
Poel, NB
Best, AA
Henry, CS
AF DeJongh, Matthew
Poel, Nathan B.
Best, Aaron A.
Henry, Christopher S.
TI Comparative analysis of genome-scale metabolic models for Mycoplasma
genitalium, Ureaplasma parvum, and Mycoplasma hominis reveals novel
routes through the Pentose Phosphate Pathway
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [DeJongh, Matthew; Poel, Nathan B.; Best, Aaron A.] Hope Coll, Holland, MI 49423 USA.
[Henry, Christopher S.] Argonne Natl Lab, Argonne, IL 60439 USA.
NR 0
TC 0
Z9 0
U1 0
U2 3
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675500615
ER
PT J
AU Devkota, S
Wang, YW
Antonopoulos, D
Chang, E
AF Devkota, Suzanne
Wang, Yunwei
Antonopoulos, Dion
Chang, Eugene
TI Diets high in saturated fat increase intestinal inflammation associated
with IBD via alterations in the microbiota
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Devkota, Suzanne] Univ Chicago, Chicago, IL 60637 USA.
[Devkota, Suzanne; Wang, Yunwei; Chang, Eugene] Univ Chicago, Dept Med, Gastroenterol Sect, Chicago, IL 60637 USA.
[Antonopoulos, Dion] Argonne Natl Lab, Inst Genom & Syst Biol, Argonne, IL 60439 USA.
NR 0
TC 0
Z9 0
U1 1
U2 3
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675501772
ER
PT J
AU Finney, L
Wolford, J
Jin, QL
Chishti, Y
Ward, J
Vogt, S
Chen, LH
AF Finney, Lydia
Wolford, Janet
Jin, Qiaoling
Chishti, Yasmin
Ward, Jesse
Vogt, Stefan
Chen, Liaohai
TI ELEMENTAL IMAGING OF HUMAN EMBRYONIC STEM CELLS
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Finney, Lydia; Ward, Jesse; Vogt, Stefan] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Lemont, IL USA.
[Finney, Lydia] Argonne Natl Lab, Adv Photon Source, Biosci Div, Lemont, IL USA.
[Wolford, Janet; Jin, Qiaoling; Chishti, Yasmin; Chen, Liaohai] Argonne Natl Lab, Biosci Div, Lemont, IL USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675507568
ER
PT J
AU Fowler, JS
Wang, GJ
Volkow, ND
AF Fowler, Joanna S.
Wang, Gene-Jack
Volkow, Nora D.
TI Imaging Brain Chemistry in Diseases of Addiction
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Fowler, Joanna S.; Wang, Gene-Jack] Brookhaven Natl Lab, Upton, NY 11973 USA.
[Volkow, Nora D.] NIDA, Bethesda, MD 20892 USA.
NR 0
TC 0
Z9 0
U1 0
U2 2
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675500198
ER
PT J
AU Garrod, MG
Miller, JW
Calvert, CC
Buchholz, BA
Green, R
Johnson, HA
Allen, LH
AF Garrod, Marjorie G.
Miller, Joshua W.
Calvert, Christopher C.
Buchholz, Bruce A.
Green, Ralph
Johnson, Heidi A.
Allen, Lindsay H.
TI In vivo enrichment of chicken eggs with 14C-B12 for determining vitamin
B12 bioavailability in humans
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Garrod, Marjorie G.; Allen, Lindsay H.] USDA ARS, Western Human Nutr Res Ctr, Davis, CA USA.
[Miller, Joshua W.; Green, Ralph] Univ Calif Davis, Dept Med Pathol & Lab Med, Sacramento, CA 95817 USA.
[Calvert, Christopher C.; Allen, Lindsay H.] Univ Calif Davis, Davis, CA 95616 USA.
[Johnson, Heidi A.] Univ Calif Davis, Sch Vet Med, Davis, CA 95616 USA.
[Buchholz, Bruce A.] Lawrence Livermore Natl Lab, Livermore, CA USA.
NR 0
TC 0
Z9 0
U1 1
U2 1
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675506594
ER
PT J
AU Greenlee, KJ
Eubanks, H
Kirkton, SD
Lee, WK
AF Greenlee, Kendra J.
Eubanks, Haleigh
Kirkton, Scott D.
Lee, Wah-Keat
TI Effects of body size and development on the hypoxia response of the
caterpillar, Manduca sexta
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Greenlee, Kendra J.] N Dakota State Univ, Fargo, ND 58105 USA.
[Eubanks, Haleigh] Mississippi Valley State Univ, Itta Bena, MS USA.
[Kirkton, Scott D.] Union Coll, Schenectady, NY 12308 USA.
[Lee, Wah-Keat] Argonne Natl Lab, Argonne, IL 60439 USA.
NR 0
TC 0
Z9 0
U1 0
U2 1
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675504499
ER
PT J
AU Grese, LN
Stanley, C
Rowe, E
O'Neill, H
Berthelier, V
AF Grese, Laura Nicole
Stanley, Christopher
Rowe, Erica
O'Neill, Hugh
Berthelier, Valerie
TI Investigating the structural flexibility of intrinsically disordered
proteins
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Grese, Laura Nicole] Univ Tennessee, Knoxville, TN USA.
[Grese, Laura Nicole; Stanley, Christopher; Rowe, Erica] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN USA.
[O'Neill, Hugh] Oak Ridge Natl Lab, Ctr Struct & Mol Biol, Oak Ridge, TN USA.
[Rowe, Erica; Berthelier, Valerie] Univ Tennessee, Med Ctr, Grad Sch Med, Knoxville, TN USA.
NR 0
TC 0
Z9 0
U1 0
U2 1
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675501893
ER
PT J
AU Hammel, M
AF Hammel, Michal
TI Ku and DNA-PK dynamic conformations and assembly regulate DNA binding
and the initial NHEJ complex
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Hammel, Michal] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675503100
ER
PT J
AU Hugenholtz, P
AF Hugenholtz, Philip
TI Is the future of metagenomics, genomics?
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Hugenholtz, Philip] DOE Joint Genome Inst, Walnut Creek, CA USA.
NR 0
TC 0
Z9 0
U1 1
U2 1
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675501849
ER
PT J
AU Joachimiak, A
AF Joachimiak, Andrzej
TI Metagenomics - the next structural frontier
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Joachimiak, Andrzej] Argonne Natl Lab, Ctr Struct Genom, Argonne, IL 60439 USA.
[Joachimiak, Andrzej] Argonne Natl Lab, Biosci Div, Struct Biol Ctr, Argonne, IL 60439 USA.
NR 0
TC 0
Z9 0
U1 0
U2 2
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675507059
ER
PT J
AU Lang, W
Majka, J
Owen, B
Klugland, A
Bjoras, M
McMurray, CT
AF Lang, Walter
Majka, Jerzy
Owen, Barbara
Klugland, Arne
Bjoras, Magnar
McMurray, Cynthia T.
TI Cause and consequences of genome instability in Huntington's Disease
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Lang, Walter; Majka, Jerzy; Owen, Barbara; McMurray, Cynthia T.] Lawrence Berkeley Labs, Life Sci Div, Berkeley, CA USA.
[Klugland, Arne; Bjoras, Magnar] Univ Oslo, Natl Hosp, Inst Med Microbiol, Dept Mol Biol, Oslo, Norway.
[McMurray, Cynthia T.] Mayo Clin, Dept Mol Pharmacol & Expt Therapeut, Rochester, MN USA.
NR 0
TC 0
Z9 0
U1 0
U2 2
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675504214
ER
PT J
AU Liu, L
Hooker, JM
Fowler, JS
Tonge, PJ
AF Liu, Li
Hooker, Jacob M.
Fowler, Joanna S.
Tonge, Peter J.
TI Imaging the Distribution of Carbon-11 Labeled Rifampicin, Isoniazid and
Pyrazinamide in Baboons using PET
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Liu, Li; Tonge, Peter J.] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA.
[Hooker, Jacob M.; Fowler, Joanna S.] Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA.
NR 0
TC 0
Z9 0
U1 0
U2 2
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675506596
ER
PT J
AU Lucks, JB
Qi, LS
Mutalik, V
Arkin, AP
AF Lucks, Julius Beau
Qi, Lei S.
Mutalik, Vivek
Arkin, Adam P.
TI Engineering mRNA structural regulation of transcription using an
RNA-sensing riboregulator
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Lucks, Julius Beau; Qi, Lei S.; Arkin, Adam P.] Univ Calif Berkeley, Berkeley, CA 94720 USA.
[Lucks, Julius Beau] Miller Inst Basic Res Sci, Berkeley, CA USA.
[Mutalik, Vivek] Joint Bioenergy Inst, Emeryville, CA USA.
[Arkin, Adam P.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
RI Arkin, Adam/A-6751-2008; Lucks, Julius/L-2801-2016
OI Arkin, Adam/0000-0002-4999-2931;
NR 0
TC 0
Z9 0
U1 0
U2 4
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675502151
ER
PT J
AU Makowska-Grzyska, MM
Zhang, RG
Peterson, SN
Joachimiak, A
AF Makowska-Grzyska, Magdalena Maria
Zhang, Rongguang
Peterson, Scott N.
Joachimiak, Andrzej
TI Crystal Structure of FolD Bifunctional Protein, a
Methylenetetrahydrofolate Dehydrogenase/Cyclohydrolase from
Campylobacter jejuni
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Makowska-Grzyska, Magdalena Maria; Joachimiak, Andrzej] Univ Chicago, Computat Inst, Chicago, IL 60637 USA.
[Zhang, Rongguang; Joachimiak, Andrzej] Argonne Natl Lab, Argonne, IL 60439 USA.
[Peterson, Scott N.] J Craig Venter Inst, Rockville, MD USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675507347
ER
PT J
AU Rubin, EM
AF Rubin, Edward M.
TI Genomic approaches for enhancer identification
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Rubin, Edward M.] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Genome Sci Div, Berkeley, CA 94720 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675501700
ER
PT J
AU Talley, TT
Park, JF
Wu, J
Ho, KY
Sankaran, B
Taylor, P
AF Talley, Todd T.
Park, John F.
Wu, Joshua
Ho, Kwok-Yiu
Sankaran, Banumathi
Taylor, Palmer
TI Crystallographic comparison of nicotinic ligands in complex with the
acetylcholine binding protein
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Talley, Todd T.; Park, John F.; Wu, Joshua; Ho, Kwok-Yiu; Taylor, Palmer] Univ Calif San Diego, Skaggs Sch Pharm & Pharmaceut Sci, La Jolla, CA 92093 USA.
[Sankaran, Banumathi] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley Ctr Struct Biol, Berkeley, CA 94720 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675505310
ER
PT J
AU Tan, KM
Tesar, C
Wilton, R
Keigher, L
Babnigg, G
Joachimiak, A
AF Tan, Kemin
Tesar, Christine
Wilton, Rosemarie
Keigher, Laura
Babnigg, Gyorgy
Joachimiak, Andrzej
TI Novel alpha-glucosidase from Human Gut Microbiome-substrate specificity
and switch.
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Tan, Kemin; Tesar, Christine; Wilton, Rosemarie; Keigher, Laura; Babnigg, Gyorgy; Joachimiak, Andrzej] Argonne Natl Lab, Argonne, IL 60439 USA.
NR 0
TC 0
Z9 0
U1 0
U2 3
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675506704
ER
PT J
AU Tonge, PJ
Ende, CA
Knudson, S
Luckner, S
Reddy, BG
England, K
Liu, L
Borgaro, J
Liu, NN
Pan, P
Lu, H
Li, HJ
Fowler, J
Kisker, C
Slayden, RA
Hooker, J
AF Tonge, Peter J.
Ende, Christopher Am
Knudson, Suan
Luckner, Sylvia
Reddy, B. Gopal
England, Kathleen
Liu, Li
Borgaro, Janine
Liu, Nina
Pan, Pan
Lu, Hao
Li, Huei-Jiun
Fowler, Joanna
Kisker, Caroline
Slayden, Richard A.
Hooker, Jacob
TI Slow Onset Inhibitors of Bacterial Fatty Acid Biosynthesis: Residence
Time, In Vivo Activity and In Vivo Imaging
SO FASEB JOURNAL
LA English
DT Meeting Abstract
C1 [Tonge, Peter J.; Ende, Christopher Am; Reddy, B. Gopal; Liu, Li; Borgaro, Janine; Liu, Nina; Pan, Pan; Lu, Hao; Li, Huei-Jiun] SUNY Stony Brook, Stony Brook, NY 11794 USA.
[Knudson, Suan; England, Kathleen; Slayden, Richard A.] Colorado State Univ, Ft Collins, CO 80523 USA.
[Luckner, Sylvia; Kisker, Caroline] Univ Wurzburg, Rudolf Virchow Ctr Biomed Res, D-97070 Wurzburg, Germany.
[Fowler, Joanna; Hooker, Jacob] Brookhaven Natl Lab, Upton, NY 11973 USA.
RI Slayden, Richard/O-8626-2016
OI Slayden, Richard/0000-0001-6857-7277
NR 0
TC 0
Z9 0
U1 0
U2 1
PU FEDERATION AMER SOC EXP BIOL
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA
SN 0892-6638
J9 FASEB J
JI Faseb J.
PD APR
PY 2010
VL 24
PG 1
WC Biochemistry & Molecular Biology; Biology; Cell Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics; Cell Biology
GA V28IW
UT WOS:000208675500178
ER
PT J
AU Roper, CD
Clegg, TB
Dunham, JD
Mendez, AJ
Tornow, W
Walter, RL
AF Roper, C. D.
Clegg, T. B.
Dunham, J. D.
Mendez, A. J.
Tornow, W.
Walter, R. L.
TI Improved Results for the H-2(d, n)(3) He Transverse Vector Polarization-
Transfer Coefficient K-y(y)' (0 degrees) at Low Energies
SO FEW-BODY SYSTEMS
LA English
DT Article
ID ION-SOURCE; NEUTRON POLARIZATION; DOUBLE-SCATTERING; BEAM; D(D,N)HE-3
AB Measurements of the H-2(d, n)(3) He transverse vector polarization-transfer coefficient K-y(y)' at 0 degrees. are reported for 29 outgoing neutron energies between 3.94 and 8.47MeV. Our new results determine K-y(y)' (0 degrees) more accurately than previous data, especially for neutron energies below 5MeV. Low-energy data for this reaction are important both as a high-intensity source of highly polarized neutrons for nuclear physics studies with polarized neutron beams, and as a test of the emerging theoretical descriptions of the four-body system, where recently substantial progress has been made.
C1 [Roper, C. D.; Dunham, J. D.; Tornow, W.; Walter, R. L.] Duke Univ, Triangle Univ Nucl Lab, Dept Phys, Durham, NC 27708 USA.
[Clegg, T. B.; Mendez, A. J.] Univ N Carolina, Dept Phys & Astron, TUNL, Chapel Hill, NC 27599 USA.
[Mendez, A. J.] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA.
RP Tornow, W (reprint author), Duke Univ, Triangle Univ Nucl Lab, Dept Phys, POB 90308, Durham, NC 27708 USA.
EM tornow@tunl.duke.edu
FU U.S. Department of Energy, Office of Nuclear Physics [DE-FG02-97ER41033,
DE-FG02-97ER41041]
FX This research was supported in part by the U.S. Department of Energy,
Office of Nuclear Physics under Grants No. DE-FG02-97ER41033 and
DE-FG02-97ER41041. The authors acknowledge A. S. Crowell's contributions
to this work.
NR 17
TC 1
Z9 1
U1 0
U2 0
PU SPRINGER WIEN
PI WIEN
PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 WIEN, AUSTRIA
SN 0177-7963
J9 FEW-BODY SYST
JI Few-Body Syst.
PD APR
PY 2010
VL 47
IS 3
BP 177
EP 184
DI 10.1007/s00601-009-0080-1
PG 8
WC Physics, Multidisciplinary
SC Physics
GA 577XH
UT WOS:000276256800004
ER
PT J
AU Park, S
Do, H
Jeong, JH
Namkung, W
Cho, MH
Park, H
Bae, YS
Yang, HL
Ellis, R
Wilson, JR
Hosea, J
AF Park, S.
Do, H.
Jeong, J. H.
Namkung, W.
Cho, M. H.
Park, H.
Bae, Y. S.
Yang, H. L.
Ellis, R.
Wilson, J. R.
Hosea, J.
TI Development status of KSTAR 5 GHz LHCD system
SO FUSION ENGINEERING AND DESIGN
LA English
DT Article
DE KSTAR LHCD; Klystron; LH launcher; KSTAR initial LHCD
ID LOWER HYBRID FREQUENCY; DESIGN
AB A steady-state lower hybrid current drive (LHCD) system is under development for advanced tokamak experiments of the Korea Superconducting Tokamak Advanced Research (KSTAR) device. The KSTAR 5 GHz steady-state LHCD system is being designed to couple an input power of 2 MW for 300 s generated by four 5 GHz klystrons. For the development of this system, there are two critical issues. One is the development of a 5 GHz CW klystron for the RF source of the system. The other is the design of a steady-state LH launcher with active water cooling. In this paper, the current status of the development and design for the KSTAR steady-state LHCD system is described. For the LHCD system, aiming at a basic experimental study of 5 GHz LH wave propagation and operational experience with an LHCD system, the installation of an initial LHCD system with a capacity of 0.5 MW for 2s is scheduled in 2010 using a 5 GHz prototype klystron and an un-cooled 1 MW launcher. The design and progress for the initial LHCD system are also presented. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Bae, Y. S.; Yang, H. L.] Natl Fus Res Inst, Taejon 305333, South Korea.
[Park, S.; Do, H.; Jeong, J. H.; Namkung, W.; Cho, M. H.; Park, H.] Pohang Univ Sci & Technol, Pohang 790784, South Korea.
[Ellis, R.; Wilson, J. R.; Hosea, J.] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
RP Bae, YS (reprint author), Natl Fus Res Inst, Taejon 305333, South Korea.
EM ysbae@nfri.re.kr
FU Ministry of Education, Science and Technology
FX This work is supported by Ministry of Education, Science and Technology.
NR 15
TC 11
Z9 12
U1 1
U2 4
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0920-3796
J9 FUSION ENG DES
JI Fusion Eng. Des.
PD APR
PY 2010
VL 85
IS 2
BP 197
EP 204
DI 10.1016/j.fusengdes.2009.12.004
PG 8
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 595WK
UT WOS:000277644100007
ER
PT J
AU Dragojlovic, Z
Raffray, AR
Najmabadi, F
Kessel, C
Waganer, L
El-Guebaly, L
Bromberg, L
AF Dragojlovic, Zoran
Raffray, A. Rene
Najmabadi, Farrokh
Kessel, Charles
Waganer, Lester
El-Guebaly, Laila
Bromberg, Leslie
TI An advanced computational algorithm for systems analysis of tokamak
power plants
SO FUSION ENGINEERING AND DESIGN
LA English
DT Article
DE ARIES; Systems code; Economic analysis; Cost of electricity; Fusion
power plants
ID ARIES-AT; THRESHOLD DATABASE; DESIGN POINT; NEUTRONICS; SELECTION;
ENERGY
AB A new computational algorithm for tokamak power plant system analysis is being developed for the ARIES project. The objective of this algorithm is to explore the most influential parameters in the physical, technological and economic trade space related to the developmental transition from experimental facilities to viable commercial power plants. This endeavor is being pursued as a new approach to tokamak systems studies, which examines an expansive, multi-dimensional trade space as opposed to traditional sensitivity analyses about a baseline design point. The new ARIES systems code consists of adaptable modules which are built from a custom-made software toolbox using object-oriented programming. The physics module captures the current tokamak physics knowledge database including modeling of the most-current proposed burning plasma experiment design (FIRE). The engineering model accurately reflects the intent and design detail of the power core elements including accurate and adjustable 3D tokamak geometry and complete modeling of all the power core and ancillary systems. Existing physics and engineering models reflect both near-term as well as advanced technology solutions that have higher performance potential. To fully assess the impact of the range of physics and engineering implementations, the plant cost accounts have been revised to reflect a more functional cost structure, supported by an updated set of costing algorithms for the direct, indirect, and financial cost accounts. All of these features have been validated against the existing ARIES-AT baseline case. The present results demonstrate visualization techniques that provide an insight into trade space assessment of attractive steady-state tokamaks for commercial use. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Dragojlovic, Zoran; Raffray, A. Rene; Najmabadi, Farrokh] Univ Calif San Diego, La Jolla, CA 92093 USA.
[Kessel, Charles] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
[El-Guebaly, Laila] Univ Wisconsin, Fus Technol Inst, Madison, WI USA.
[Bromberg, Leslie] MIT, Ctr Plasma Fus, Cambridge, MA 02139 USA.
RP Dragojlovic, Z (reprint author), 1800 S Maple St,Apartment 214, Escondido, CA 92025 USA.
EM zoran@fusion.ucsd.edu
FU United States Department of Energy, Office of Fusion Energy
[DE-FC03-95ER54299]
FX This work was supported by the United States Department of Energy,
Office of Fusion Energy DE-FC03-95ER54299.
NR 41
TC 14
Z9 15
U1 1
U2 9
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0920-3796
EI 1873-7196
J9 FUSION ENG DES
JI Fusion Eng. Des.
PD APR
PY 2010
VL 85
IS 2
BP 243
EP 265
DI 10.1016/j.fusengdes.2010.02.015
PG 23
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 595WK
UT WOS:000277644100013
ER
PT J
AU Shapiro, MA
Kowalski, EJ
Sirigiri, JR
Tax, DS
Temkin, RJ
Bigelow, TS
Caughman, JB
Rasmussen, DA
AF Shapiro, M. A.
Kowalski, E. J.
Sirigiri, J. R.
Tax, D. S.
Temkin, R. J.
Bigelow, T. S.
Caughman, J. B.
Rasmussen, D. A.
TI LOSS ESTIMATE FOR ITER ECH TRANSMISSION LINE INCLUDING MULTIMODE
PROPAGATION
SO FUSION SCIENCE AND TECHNOLOGY
LA English
DT Article
DE ITER; electron cyclotron heating; transmission line
ID CORRUGATED WAVE-GUIDE; SYSTEM; COMPONENTS; LAUNCHER; DESIGN
AB The ITER electron cyclotron heating (ECH) transmission lines (TLs) are 63.5-mm-diam corrugated waveguides that will each carry 1 MW of power at 170 GHz. The TL is defined here as the corrugated wave guide system connecting the gyrotron mirror optics unit (MO U) to the entrance of the ECH launcher and includes miter bends and other corrugated wave guide components. The losses on the ITER TL have been calculated for four possible cases corresponding to having HE(11) mode purity at the input of the TL of 100, 97, 90, and 80%. The losses due to coupling, ohmic, and mode conversion loss are evaluated in detail using a numerical code and analytical approaches. Estimates of the calorimetric loss on the line show that the output power is reduced by about 5, +/- 1% because of ohmic loss in each of the four cases. Estimates of the mode conversion loss show that the fraction of output power in the HE(11) mode is similar to 3% smaller than the fraction of input power in the HE(11) mode. High output mode purity therefore can be achieved only with significantly higher input mode purity. Combining both ohmic and mode conversion loss, the efficiency of the TL from the gyrotron MOU to the ECH launcher can be roughly estimated in theory as 92% times the fraction of input power in the HE(11) mode.
C1 [Shapiro, M. A.; Kowalski, E. J.; Sirigiri, J. R.; Tax, D. S.; Temkin, R. J.] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA.
[Bigelow, T. S.; Caughman, J. B.; Rasmussen, D. A.] Oak Ridge Natl Lab, US ITER Project, Oak Ridge, TN 37831 USA.
RP Shapiro, MA (reprint author), MIT, Plasma Sci & Fus Ctr, 77 Massachusetts Ave, Cambridge, MA 02139 USA.
EM shapiro@psfc.mit.edu
RI Sirigiri, Jagadishwar/E-6070-2011; Caughman, John/R-4889-2016
OI Caughman, John/0000-0002-0609-1164
FU U.S. Department of Energy, Office of Fusion Energy Sciences; U.S. ITER
FX This research was supported by the U.S. Department of Energy, Office of
Fusion Energy Sciences, and by the U.S. ITER Project managed by
Battelle/Oak Ridge National Laboratory.
NR 24
TC 31
Z9 31
U1 0
U2 6
PU AMER NUCLEAR SOC
PI LA GRANGE PK
PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA
SN 1536-1055
J9 FUSION SCI TECHNOL
JI Fusion Sci. Technol.
PD APR
PY 2010
VL 57
IS 3
BP 196
EP 207
PG 12
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 587TL
UT WOS:000277015800002
ER
PT J
AU Young, KM
AF Young, Kenneth M.
TI AN ASSESSMENT OF THE PENETRATIONS IN THE FIRST WALL REQUIRED FOR PLASMA
MEASUREMENTS FOR CONTROL OF AN ADVANCED TOKAMAK PLASMA DEMO
SO FUSION SCIENCE AND TECHNOLOGY
LA English
DT Article
DE plasma diagnostics; tokamaks; demonstration fusion reactor
ID ARIES-AT
AB A demonstration tokamak is an essential next step toward a magnetic fusion based reactor. One based on advanced tokamak plasmas is especially appealing because of its relative compactness. However, many plasma measurements will be required to provide the necessary signals to feed to ancillary systems to protect the device and control the plasma. This technical note addresses the question of how much intrusion into the blanket system will be required to allow the measurements needed to provide the information required for plasma control. All diagnostics will require, at least, the same shielding designs as planned for ITER, while having the capability to maintain their calibration through very long pulses. Much work is required to define better the measurement needs and the quantity and quality of the measurements that will have to be made, and how they can be integrated into the other tokamak structures.
C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
RP Young, KM (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA.
EM kyoung@pppl.gov
NR 8
TC 8
Z9 8
U1 1
U2 3
PU AMER NUCLEAR SOC
PI LA GRANGE PK
PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA
SN 1536-1055
J9 FUSION SCI TECHNOL
JI Fusion Sci. Technol.
PD APR
PY 2010
VL 57
IS 3
BP 298
EP 304
PG 7
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 587TL
UT WOS:000277015800008
ER
PT J
AU Ghose, SK
Waychunas, GA
Trainor, TP
Eng, PJ
AF Ghose, Sanjit K.
Waychunas, Glenn A.
Trainor, Thomas P.
Eng, Peter J.
TI Hydrated goethite (alpha-FeOOH) (100) interface structure: Ordered water
and surface functional groups
SO GEOCHIMICA ET COSMOCHIMICA ACTA
LA English
DT Article
ID SCANNING-TUNNELING-MICROSCOPY; INTRINSIC PROTON AFFINITY;
X-RAY-SCATTERING; BOND-VALENCE; MINERAL SURFACES; ARSENATE ADSORPTION;
METAL (HYDR)OXIDES; ELECTRON-TRANSFER; OXIDE SURFACES; HEMATITE 0001
AB Goethite(alpha-FeOOH), in abundant and highly reactive iron oxyhydroxide mineral, has been the Subject of numerous studies of environmental interface reactivity. However, such studies have been hampered by the lack of experimental constraints oil aqueous interface structure, and especially of the surface water molecular arrangements. Structural information of this type is crucial because reactivity is dictated by the nature of the Surface functional groups and the structure or distribution of water and electrolyte at the solid-solution interface. In this study we have investigated the goethite (1 0 0) surface using surface diffraction techniques, and have determined the relaxed surface structure, the surface functional groups, and the three dimensional nature of two distinct sorbed water layers. The crystal truncation rod (CTR) results show that the interface structure consists of a double hydroxyl, double water terminated interface with significant atom relaxations. Further, the double hydroxyl terminated surface dominates with ail 89% contribution having a chiral subdomain structure oil the (1 0 0) cleavage faces. The proposed interface stoichiometry is ((H2O)-(H2O)-OH2-OH-Fe-O-O-Fe-R) with two types of terminal hydroxyls; a bidentate (B-type) hydroxo group and a monodentate (A-type) aquo group. Using the bond-valence approach the protonation states of the terminal hydroxyls are predicted to be OH type (bidentate hydroxyl with oxygen Coupled to two Fe3+ ions) and OH, type (monodentate hydroxyl with oxygen tied to only one Fe3+). A double layer three dimensional ordered water structure at the interface was determined from refinement of fits to the experimental data. Application of bond-valence constraints to the terminal hydroxyls with appropriate rotation of the water dipole moments allowed a plausible dipole orientation model as predicted. The structural results are discussed in terms of protonation and H-bonding at the interface, and the results provide an ideal basis for testing theoretical predictions of characteristic surface properties Such as pK(a), sorption equilibria, and surface water permittivity. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Ghose, Sanjit K.; Eng, Peter J.] Univ Chicago, Consortium Adv Radiat Sources, Chicago, IL 60637 USA.
[Ghose, Sanjit K.; Waychunas, Glenn A.] Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA 94720 USA.
[Trainor, Thomas P.] Univ Alaska Fairbanks, Dept Chem & Biochem, Fairbanks, AK 99775 USA.
[Eng, Peter J.] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA.
RP Ghose, SK (reprint author), SUNY Stony Brook, Inst Mineral Phys, Stony Brook, NY 11794 USA.
EM sghose@bnl.gov
FU NSF-NIRT [NSF-0404400]; NSF-EMSI [NSF-0431425]; U.S. Department of
Energy [DE-AC02-05CH11231]; National Science Foundation - Earth Sciences
[EAR-0622171]; Department of Energy - Geosciences [DE-FG02-94ER14466];
DOE, Office of Science; Office of Basic Energy Sciencies, Office of
Energy Research [DE-AC02-06CH11357]
FX The authors thank Lahsen Assoufid, Sarah Petitto, Kunaljeet Tanwar,
Jeffry G. Catalano and Joseph Pluth, for their help at different stages
of the work. Our thanks also go to Prof. Gordon E. Brown Jr. for his
useful and insightful discussion. We also appreciate and thank four
anonymous reviewers and the Associate Editor K. Rosso for their
constructive comments and suggestions. This research was supported by
NSF-NIRT (NSF-0404400) and NSF-EMSI (NSF-0431425) Grants and the
Director, Office of Science, Office of Basic Energy Sciences, Division
of Chemical Sciences, Geosciences, and Biosciences, of the U.S.
Department of Energy under Contract No. DE-AC02-05CH11231. The
measurements are done at GeoSoilEnviroCARS (Sector 13) of the Advanced
Photon Source (APS), Argonne National Laboratory. GeoSoilEnviroCARS is
supported by the National Science Foundation - Earth Sciences
EAR-0622171 and Department of Energy - Geosciences DE-FG02-94ER14466.
Use of the APS was supported by DOE, Office of Science, and Office of
Basic Energy Sciencies, Office of Energy Research, under Contract No.
DE-AC02-06CH11357.
NR 60
TC 49
Z9 50
U1 4
U2 75
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0016-7037
EI 1872-9533
J9 GEOCHIM COSMOCHIM AC
JI Geochim. Cosmochim. Acta
PD APR 1
PY 2010
VL 74
IS 7
BP 1943
EP 1953
DI 10.1016/j.gca.2009.12.015
PG 11
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 564OP
UT WOS:000275225200001
ER
PT J
AU Modrak, RT
Arrowsmith, SJ
Anderson, DN
AF Modrak, Ryan T.
Arrowsmith, Stephen J.
Anderson, Dale N.
TI A Bayesian framework for infrasound location
SO GEOPHYSICAL JOURNAL INTERNATIONAL
LA English
DT Article
DE Probability distributions; Seismic monitoring and test-ban treaty
verification; Statistical seismology
ID ARRAYS; ATMOSPHERE; EXPLOSION; WAVES
AB We develop a framework for location of infrasound events using backazimuth and infrasonic arrival times from multiple arrays. Bayesian infrasonic source location (BISL) developed here estimates event location and associated credibility regions. BISL accounts for unknown source-to-array path or phase by formulating infrasonic group velocity as random. Differences between observed and predicted source-to-array traveltimes are partitioned into two additive Gaussian sources, measurement error and model error, the second of which accounts for the unknown influence of wind and temperature on path. By applying the technique to both synthetic tests and ground-truth events, we highlight the complementary nature of back azimuths and arrival times for estimating well-constrained event locations. BISL is an extension to methods developed earlier by Arrowsmith et al. that provided simple bounds on location using a grid-search technique.
C1 [Modrak, Ryan T.; Arrowsmith, Stephen J.; Anderson, Dale N.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Modrak, RT (reprint author), Los Alamos Natl Lab, EES 17, Los Alamos, NM 87545 USA.
EM sarrowsmith@gmail.com
FU U.S. Department of Energy [DE-AC52-06NA24596]
FX We thank Prof Jeannot Trampert and two anonymous reviewers for their
constructive comments on an earlier version of this manuscript. The
authors acknowledge the support of Ms Leslie A. Casey and the National
Nuclear Security Administration Office of Nonproliferation Research and
Development for funding this work. This work was completed under the
auspices of the U.S. Department of Energy by Los Alamos National
Laboratory under contract DE-AC52-06NA24596.
NR 18
TC 14
Z9 14
U1 0
U2 3
PU OXFORD UNIV PRESS
PI OXFORD
PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
SN 0956-540X
J9 GEOPHYS J INT
JI Geophys. J. Int.
PD APR
PY 2010
VL 181
IS 1
BP 399
EP 405
DI 10.1111/j.1365-246X.2010.04499.x
PG 7
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 573BV
UT WOS:000275884300026
ER
PT J
AU Bingham, PA
Connelly, AJ
Hand, RJ
Hyatt, NC
Northrup, PA
Mori, RA
Glatzel, P
Kavcic, M
Zitnik, M
Bucar, K
Edge, R
AF Bingham, P. A.
Connelly, A. J.
Hand, R. J.
Hyatt, N. C.
Northrup, P. A.
Mori, R. Alonso
Glatzel, P.
Kavcic, M.
Zitnik, M.
Bucar, K.
Edge, R.
TI A multi-spectroscopic investigation of sulphur speciation in silicate
glasses and slags
SO GLASS TECHNOLOGY-EUROPEAN JOURNAL OF GLASS SCIENCE AND TECHNOLOGY PART A
LA English
DT Article
ID RAY-ABSORPTION SPECTROSCOPY; NEAR-EDGE STRUCTURE; ELECTROMOTIVE-FORCE
SERIES; BOROSILICATE MELT; OXIDATION-STATE; AMBER GLASS; XANES
SPECTROSCOPY; REDOX COUPLES; PARAMAGNETIC RESONANCE;
TEMPERATURE-DEPENDENCE
AB Sulphur K-edge x-ray absorption near-edge structure (XANES), sulphur K(alpha) and K(beta) high resolution x-ray emission spectroscopies (XES), electron paramagnetic resonance (EPR) and optical absorption spectroscopies have been used to study the speciation of sulphur in a range of soda-lime-silica glasses and silicate slags. Several inorganic standards with known sulphur oxidation states and structural environments have also been analysed. Results confirm that the average oxidation state of sulphur in glasses decreases, as expected, in the order (colourless>light olive>dark olive>light amber>dark amber). This behaviour is consistent with decreasing S(6+)/Sigma S ratio, which has been quantified by linear combination fitting of XES S K spectra, and with analysed sulphur contents which exhibit a characteristic relationship with oxygen partial pressure, pO(2). A combination of S(6+), S(5+), S(4+) and more reduced sulphur species has been detected in olive and amber glasses. The S(4+) and S(5+) species are most evident in olive-coloured glasses produced under moderately reducing conditions that coincide with minimum sulphur solubilities. The reduced form of sulphur, present in all reduced glasses, is interpreted as being present as S(2-) on the basis of XANES, XES, EPR and optical measurements. An alternative interpretation of the data is that there is a continuum of less strongly reduced species, primarily S(+) and S(2+); this interpretation has less merit. In this paper we show that the established relationship that describes sulphur redox may in terms of S(6+) and S(2-), and which states that only these two species co-exist over a narrow, moderately reducing range of pO(2), does not fully describe the behaviour of S in the industrial, non-equilibrated glasses studied. Hence this relationship requires slight modification for non-equilibrated systems to explain the existence of intermediate sulphur oxidation states such as S' and S(5+), particularly within the intermediate pO(2) range that corresponds with sulphur solubility minima.
C1 [Bingham, P. A.; Connelly, A. J.; Hand, R. J.; Hyatt, N. C.] Univ Sheffield, Dept Mat Engn, Immobilisat Sci Lab, Sheffield S1 3JD, S Yorkshire, England.
[Northrup, P. A.] Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA.
[Mori, R. Alonso; Glatzel, P.] European Synchrotron Radiat Facil, Beamline ID 26, F-38043 Grenoble, France.
[Kavcic, M.; Zitnik, M.; Bucar, K.] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia.
[Edge, R.] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs, England.
RP Bingham, PA (reprint author), Univ Sheffield, Dept Mat Engn, Immobilisat Sci Lab, Mappin St, Sheffield S1 3JD, S Yorkshire, England.
EM p.a.bingham@sheffield.ac.uk
RI alonso-mori, roberto/G-2638-2013; Bingham, Paul/E-8214-2014; Glatzel,
Pieter/E-9958-2010;
OI alonso-mori, roberto/0000-0002-5357-0934; Bingham,
Paul/0000-0001-6017-0798; Glatzel, Pieter/0000-0001-6532-8144; Hyatt,
Neil/0000-0002-2491-3897
FU UKs Engineering and Physical Sciences Research Council (EPSRC); Society
of Glass Technology; Royal Academy of Engineering; Worshipful Company of
Armourers and Brasiers; Calumite Ltd; ESRF; NSLS
FX PAB, AJC, RJH and NCH acknowledge the UKs Engineering and Physical
Sciences Research Council (EPSRC) for funding this research and Calumite
Ltd for supplying samples of blast furnace slag. PAB acknowledges with
thanks the Society of Glass Technology, the Royal Academy of
Engineering, the Worshipful Company of Armourers and Brasiers and
Calumite Ltd for international travel grants. AJC acknowledges with
thanks the Worshipful Company of Armourers and Brasiers for an
international travel grant. Finally, we acknowledge the European
Synchrotron Radiation Facility and the National Synchrotron Light Source
for provision of synchrotron radiation facilities and we would like to
thank the ESRF and NSLS support groups and X15B and ID26 staff.
NR 98
TC 10
Z9 10
U1 1
U2 15
PU SOC GLASS TECHNOLOGY
PI SHEFFIELD
PA UNIT 9, TWELVE O CLOCK COURT, 21 ATTERCLIFFE RD, SHEFFIELD S4 7WW, S
YORKSHIRE, ENGLAND
SN 1753-3546
J9 GLASS TECHNOL-PART A
JI Glass Technol.-Eur. J. Glass Sci. Technol. Part A
PD APR
PY 2010
VL 51
IS 2
BP 63
EP 80
PG 18
WC Materials Science, Ceramics
SC Materials Science
GA 612AU
UT WOS:000278869400003
ER
PT J
AU Bozell, JJ
Petersen, GR
AF Bozell, Joseph J.
Petersen, Gene R.
TI Technology development for the production of biobased products from
biorefinery carbohydrates-the US Department of Energy's "Top 10"
revisited
SO GREEN CHEMISTRY
LA English
DT Review
ID SUCCINIC ACID PRODUCTION; VIBRIO-FURNISSII M1; ION-EXCHANGE-RESIN;
CLOSTRIDIUM-BUTYRICUM VPI-3266; LIQUID-PHASE DEHYDRATION; RARE SUGAR
XYLITOL; LEVULINIC ACID; RENEWABLE RESOURCES; BIOTECHNOLOGICAL
PRODUCTION; GLYCEROL CARBONATE
AB A biorefinery that supplements its manufacture of low value biofuels with high value biobased chemicals can enable efforts to reduce nonrenewable fuel consumption while simultaneously providing the necessary financial incentive to stimulate expansion of the biorefining industry. However, the choice of appropriate products for addition to the biorefinery's portfolio is challenged by a lack of broad-based conversion technology coupled with a plethora of potential targets. In 2004, the US Department of Energy (DOE) addressed these challenges by describing a selection process for chemical products that combined identification of a small group of compounds derived from biorefinery carbohydrates with the research and technology needs required for their production. The intent of the report was to catalyze research efforts to synthesize multiple members of this group, or, ideally, structures not yet on the list. In the six years since DOE's original report, considerable progress has been made in the use of carbohydrates as starting materials for chemical production. This review presents an updated evaluation of potential target structures using similar selection methodology, and an overview of the technology developments that led to the inclusion of a given compound. The list provides a dynamic guide to technology development that could realize commercial success through the proper integration of biofuels with biobased products.
C1 [Bozell, Joseph J.] Univ Tennessee, Forest Prod Ctr, Knoxville, TN 37996 USA.
[Petersen, Gene R.] US DOE, Golden Field Off, Golden, CO 80401 USA.
RP Bozell, JJ (reprint author), Univ Tennessee, Forest Prod Ctr, 2506 Jacob Dr, Knoxville, TN 37996 USA.
EM jbozell@utk.edu; gene.petersen@go.doe.gov
NR 181
TC 1099
Z9 1119
U1 82
U2 579
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1463-9262
J9 GREEN CHEM
JI Green Chem.
PD APR
PY 2010
VL 12
IS 4
BP 539
EP 554
DI 10.1039/b922014c
PG 16
WC Chemistry, Multidisciplinary; GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
SC Chemistry; Science & Technology - Other Topics
GA 587ES
UT WOS:000276973200001
ER
PT J
AU Heldebrant, DJ
Koech, PK
Ang, MTC
Liang, C
Rainbolt, JE
Yonkera, CR
Jessop, PG
AF Heldebrant, David J.
Koech, Phillip K.
Ang, M. Trisha C.
Liang, Chen
Rainbolt, James E.
Yonkera, Clement R.
Jessop, Philip G.
TI Reversible zwitterionic liquids, the reaction of alkanol guanidines,
alkanol amidines, and diamines with CO2
SO GREEN CHEMISTRY
LA English
DT Article
ID CARBON-DIOXIDE; CONSTRUCTION; TEMPERATURE; ACTIVATION; MIXTURES;
POLYMERS; SOLVENTS; RELEASE; DBU
AB Alkanolamidines, alkanolguanidines and diamines each react with CO2 to form reversible zwitterionic liquids. CO2 is chemically bound to the alcohol on alkanolamidines and alkanolguanidines as zwitterionic alkylcarbonates, while CO2 is chemically bound on diamines as zwitterionic carbamates. All three classes of zwitterionic liquids could be reverted to their non-ionic forms by thermally stripping the CO2 at temperatures near 50 degrees C, while one derivative was found to irreversibly form a cyclic carbonate.
C1 [Heldebrant, David J.; Koech, Phillip K.; Rainbolt, James E.; Yonkera, Clement R.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Ang, M. Trisha C.; Liang, Chen; Jessop, Philip G.] Queens Univ, Dept Chem, Kingston, ON K7L 3N6, Canada.
RP Heldebrant, DJ (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA.
EM david.heldebrant@pnl.gov
OI Koech, Phillip/0000-0003-2996-0593
FU Pacific Northwest National Laboratory (PNNL) Directed Research and
Development; Natural Sciences and Engineering Research Council of Canada
(NSERC); CFI/OIT; Canada Research Chairs
FX DJH, PKK and CRY gratefully acknowledge internal funding from Pacific
Northwest National Laboratory (PNNL) Directed Research and Development.
PNNL is proudly operated by Battelle for the U. S. Department of Energy.
PGJ, TA, and CL thank the Natural Sciences and Engineering Research
Council of Canada (NSERC), CFI/OIT, and the Canada Research Chairs
program for funding the research, the equipment, and PGJ's salary,
respectively. The authors thank Dr Rui Zhang for the high resolution
mass spec. (HRMS) analysis and Dr Ruiyao Wang for the X-ray
crystallography.
NR 27
TC 86
Z9 88
U1 10
U2 107
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1463-9262
J9 GREEN CHEM
JI Green Chem.
PD APR
PY 2010
VL 12
IS 4
BP 713
EP 721
DI 10.1039/b924790d
PG 9
WC Chemistry, Multidisciplinary; GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
SC Chemistry; Science & Technology - Other Topics
GA 587ES
UT WOS:000276973200027
ER
PT J
AU Halevy, I
Haroush, S
Eisen, Y
Silberman, I
Moreno, D
Hen, A
Winterrose, ML
Ghose, S
Chen, ZQ
AF Halevy, Itzhak
Haroush, Shlomo
Eisen, Yosef
Silberman, Ido
Moreno, Dany
Hen, Amir
Winterrose, Mike L.
Ghose, Sanjit
Chen, Zhiqiang
TI Crystallographic and magnetic structure of HAVAR under high-pressure
using diamond anvil cell (DAC)
SO HYPERFINE INTERACTIONS
LA English
DT Proceedings Paper
CT 3rd Joint International Conference on Hyperfine Interactions (HFI) /
International Symposium on Nuclear Quadrupole Interactions (NQI)
CY SEP 12-17, 2010
CL CERN, Geneva, SWITZERLAND
HO CERN
DE HAVAR; Crystallographic structure; Magnetic properties; High-pressure;
Diamond anvil cell (DAC)
AB Annealed (H1) and cold-rolled (H2) HAVAR has been studied using high-pressure synchrotron X-ray diffraction. A structural phase transformation was discovered at similar to 13 GPa at ambient temperature, transforming from m -3 m (S.G. 225) to P 63/mmc (S.G. 194) symmetry. The transition was not reversible on pressure release. The low-pressure cubic phase was found to be more compressible than the high-pressure hexagonal phase. Conventional Mossbauer and NFS shows that the HAVAR is not magnetic at room temperature and no splitting is observed. The SQUID indicates a huge difference in the temperature dependence of the magnetic susceptibility between the cold Rolled HAVAR compared to the annealed HAVAR.
C1 [Halevy, Itzhak] Nucl Res Ctr Negev, Beer Sheva, Israel.
[Halevy, Itzhak; Winterrose, Mike L.] CALTECH, Dept Mat Sci, Pasadena, CA 91125 USA.
[Haroush, Shlomo] NRC Negev, Beer Sheva, Israel.
[Haroush, Shlomo; Eisen, Yosef; Silberman, Ido; Moreno, Dany] Soreq NRC, Yavne, Israel.
[Hen, Amir] Ben Gurion Univ Negev, Dept Nucl Engn, IL-84105 Beer Sheva, Israel.
[Ghose, Sanjit; Chen, Zhiqiang] Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA.
RP Halevy, I (reprint author), Nucl Res Ctr Negev, POB 9001, Beer Sheva, Israel.
EM halevyi@caltech.edu
NR 6
TC 1
Z9 1
U1 2
U2 2
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0304-3843
J9 HYPERFINE INTERACT
JI Hyperfine Interact.
PD APR
PY 2010
VL 197
IS 1-3
BP 135
EP 141
DI 10.1007/s10751-010-0222-3
PG 7
WC Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter;
Physics, Nuclear
SC Physics
GA 068IU
UT WOS:000313360900024
ER
PT J
AU Smith, KA
AF Smith, Kandler A.
TI Electrochemical Control of Lithium-Ion Batteries
SO IEEE CONTROL SYSTEMS MAGAZINE
LA English
DT Article
ID PROPER ORTHOGONAL DECOMPOSITION; INSERTION CELL; LEAD-ACID; SYSTEMS;
STATE; SIMULATION; STRESS; CHARGE; MODEL
C1 US DOE, Natl Renewable Energy Lab, Golden, CO USA.
RP Smith, KA (reprint author), US DOE, Natl Renewable Energy Lab, Golden, CO USA.
EM kandler.smith@nrel.gov
NR 19
TC 23
Z9 23
U1 3
U2 15
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1066-033X
J9 IEEE CONTR SYST MAG
JI IEEE Control Syst. Mag.
PD APR
PY 2010
VL 30
IS 2
BP 18
EP 25
DI 10.1109/MCS.2010.935882
PG 8
WC Automation & Control Systems
SC Automation & Control Systems
GA 601LS
UT WOS:000278061600005
ER
PT J
AU Theiler, J
Scovel, C
Wohlberg, B
Foy, BR
AF Theiler, James
Scovel, Clint
Wohlberg, Brendt
Foy, Bernard R.
TI Elliptically Contoured Distributions for Anomalous Change Detection in
Hyperspectral Imagery
SO IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
LA English
DT Article
DE Adaptive signal detection; algorithms; covariance matrices; data-model
ellipsoids; Gaussian distributions; image analysis; pattern recognition;
remote sensing
ID IMAGING DATA
AB We derive a class of algorithms for detecting anomalous changes in hyperspectral image pairs by modeling the data with elliptically contoured (EC) distributions. These algorithms are generalizations of well-known detectors that are obtained when the EC function is Gaussian. The performance of these EC-based anomalous change detectors is assessed on real data using both real and simulated changes. In these experiments, the EC-based detectors substantially outperform their Gaussian counterparts.
C1 [Theiler, James; Scovel, Clint; Wohlberg, Brendt; Foy, Bernard R.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Theiler, J (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
RI Wohlberg, Brendt/M-7764-2015
OI Wohlberg, Brendt/0000-0002-4767-1843
FU Los Alamos Laboratory Directed Research and Development Program
FX This work was supported by the Los Alamos Laboratory Directed Research
and Development Program.
NR 26
TC 21
Z9 22
U1 0
U2 6
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1545-598X
J9 IEEE GEOSCI REMOTE S
JI IEEE Geosci. Remote Sens. Lett.
PD APR
PY 2010
VL 7
IS 2
BP 271
EP 275
DI 10.1109/LGRS.2009.2032565
PG 5
WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote
Sensing; Imaging Science & Photographic Technology
SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science
& Photographic Technology
GA 583NF
UT WOS:000276683000010
ER
PT J
AU Chartrand, R
Baraniuk, RG
Eldar, YC
Figueiredo, MAT
Tanner, J
AF Chartrand, Rick
Baraniuk, Richard G.
Eldar, Yonina C.
Figueiredo, Mario A. T.
Tanner, Jared
TI Introduction to the Issue on Compressive Sensing
SO IEEE JOURNAL OF SELECTED TOPICS IN SIGNAL PROCESSING
LA English
DT Editorial Material
C1 [Chartrand, Rick] Los Alamos Natl Lab, Los Alamos, NM 87544 USA.
[Baraniuk, Richard G.] Rice Univ, Houston, TX 77005 USA.
[Eldar, Yonina C.] Technion Israel Inst Technol, IL-32000 Haifa, Israel.
[Figueiredo, Mario A. T.] Inst Super Tecn, P-1049001 Lisbon, Portugal.
[Tanner, Jared] Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland.
RP Chartrand, R (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87544 USA.
EM rickc@lanl.gov; richb@rice.edu; yonina@ee.technion.ac.il;
mario.figueiredo@lx.it.pt; jared.tanner@ed.ac.uk
RI Figueiredo, Mario/C-5428-2008;
OI Figueiredo, Mario/0000-0002-0970-7745; Chartrand,
Rick/0000-0003-3256-2238
NR 0
TC 11
Z9 12
U1 1
U2 13
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1932-4553
J9 IEEE J-STSP
JI IEEE J. Sel. Top. Signal Process.
PD APR
PY 2010
VL 4
IS 2
BP 241
EP 243
DI 10.1109/JSTSP.2010.2043892
PG 3
WC Engineering, Electrical & Electronic
SC Engineering
GA 570JI
UT WOS:000275669900001
ER
PT J
AU Fischer, P
Im, MY
AF Fischer, Peter
Im, Mi-Young
TI Imaging Nanoscale Magnetic Structures With Polarized Soft X-Ray Photons
SO IEEE PHOTONICS JOURNAL
LA English
DT Article
DE Magnetic domain imaging; magnetophotonics; picosecond phenomena;
synchrotron sources; time-resolved imaging; ultrafast; X-ray imaging;
X-ray optics
ID SCANNING-ELECTRON-MICROSCOPY; CIRCULAR-DICHROISM; DYNAMICS; NICKEL;
NANOSTRUCTURES; EXCITATION
AB Imaging nanoscale magnetic structures and their fast dynamics is scientifically interesting and technologically of highest relevance. The combination of circularly polarized soft X-ray photons, which provide a strong X-ray magnetic circular dichroism effect at characteristic X-ray absorption edges, with a high-resolution soft X-ray microscope utilizing Fresnel zone plate optics allows, in a unique way, the study of the stochastical behavior in the magnetization reversal process of thin films and the ultrafast dynamics of magnetic vortices and domain walls in confined ferromagnetic structures. Future sources of femtosecond-short and highly intense soft X-ray photon pulses hold the promise of magnetic imaging down to fundamental magnetic length and time scales.
C1 [Fischer, Peter; Im, Mi-Young] Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA 94720 USA.
RP Fischer, P (reprint author), Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA 94720 USA.
EM PJFischer@lbl.gov
RI MSD, Nanomag/F-6438-2012; Fischer, Peter/A-3020-2010
OI Fischer, Peter/0000-0002-9824-9343
FU Office of Science, Office of Basic Energy Sciences, Materials Sciences
and Engineering Division of the U.S. Department of Energy
FX This work was supported by the Director, Office of Science, Office of
Basic Energy Sciences, Materials Sciences and Engineering Division of
the U.S. Department of Energy.
NR 51
TC 1
Z9 1
U1 0
U2 7
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1943-0655
J9 IEEE PHOTONICS J
JI IEEE Photonics J.
PD APR
PY 2010
VL 2
IS 2
BP 260
EP 264
DI 10.1109/JPHOT.2010.2043666
PG 5
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA 691BZ
UT WOS:000285056600024
ER
PT J
AU Close, S
AF Close, Sigrid
TI Space Invaders
SO IEEE SPECTRUM
LA English
DT Article
C1 [Close, Sigrid] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
NR 0
TC 0
Z9 0
U1 1
U2 1
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9235
J9 IEEE SPECTRUM
JI IEEE Spectr.
PD APR
PY 2010
VL 47
IS 4
BP 38
EP 43
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA 574NC
UT WOS:000275995700017
ER
PT J
AU Young, WF
Holloway, CL
Koepke, G
Camell, D
Becquet, Y
Remley, KA
AF Young, William F.
Holloway, Christopher L.
Koepke, Galen
Camell, Dennis
Becquet, Yann
Remley, Kate A.
TI Radio-Wave Propagation Into Large Building Structures-Part 1: CW Signal
Attenuation and Variability
SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
LA English
DT Article
DE Emergency responder communications; large building radio frequency
propagation; radio-frequency propagation measurements
ID MHZ
AB We report on our investigation into radio communications problems faced by emergency responders in disaster situations. A fundamental challenge to communications into and out of large buildings is the strong attenuation of radio signals caused by losses and scattering in the building materials and structure. Another challenge is the large signal variability that occurs throughout these large structures. We designed experiments in various large building structures in an effort to quantify continuous wave (CW) radio-signal attenuation and variability throughout twelve large structures. We carried radio frequency transmitters throughout these structures and placed receiving systems outside the structures. The transmitters were tuned to frequencies near public safety, cell phone bands, as well as ISM and wireless LAN bands. This report summarizes the experiments, performed in twelve large building structures. We describe the experiments, detail the measurement system, show primary results of the data we collected, and discuss some of the interesting propagation effects we observed.
C1 [Young, William F.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Holloway, Christopher L.; Koepke, Galen; Camell, Dennis; Becquet, Yann; Remley, Kate A.] Natl Inst Stand & Technol, Boulder, CO 80305 USA.
RP Young, WF (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM wfyoung@sandia.gov; holloway@boulder.nist.gov
FU U. S. Department of Justice, Community-Oriented Police Services through
the NIST Public-Safety Communications Research Laboratory
FX This work was supported in part by the U. S. Department of Justice,
Community-Oriented Police Services through the NIST Public-Safety
Communications Research Laboratory.
NR 29
TC 10
Z9 12
U1 0
U2 3
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-926X
J9 IEEE T ANTENN PROPAG
JI IEEE Trans. Antennas Propag.
PD APR
PY 2010
VL 58
IS 4
BP 1279
EP 1289
DI 10.1109/TAP.2010.2041142
PG 11
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA 579YX
UT WOS:000276414500029
ER
PT J
AU Bryan, MT
Fry, PW
Schrefl, T
Gibbs, MRJ
Allwood, DA
Im, MY
Fischer, P
AF Bryan, Matthew T.
Fry, Paul W.
Schrefl, Thomas
Gibbs, Mike R. J.
Allwood, Dan A.
Im, Mi-Young
Fischer, Peter
TI Transverse Field-Induced Nucleation Pad Switching Modes During Domain
Wall Injection
SO IEEE TRANSACTIONS ON MAGNETICS
LA English
DT Article
DE Domain wall injection; nanowires; nucleation pad; switching modes;
transverse field
ID X-RAY MICROSCOPY; MAGNETIC WIRE; NANOWIRES
AB We have used magnetic transmission soft X-ray microscopy (M-TXM) to image in-field magnetization configurations of patterned Ni(80)F(20) domain wall "nucleation pads" with attached planar nanowires. Comparison with micromagnetic simulations suggests that the evolution of magnetic domains in rectangular injection pads depends on the relative orientation of closure domains in the remanent state. The magnetization reversal pathway is altered by the inclusion of transverse magnetic fields. These different modes explain previous results of domain wall injection into nanowires.
C1 [Bryan, Matthew T.; Schrefl, Thomas; Gibbs, Mike R. J.; Allwood, Dan A.] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England.
[Fry, Paul W.] Univ Sheffield, Nanosci & Technol Ctr, Sheffield S3 7HQ, S Yorkshire, England.
[Schrefl, Thomas] St Poelten Univ Appl Sci, A-3100 St Polten, Austria.
[Im, Mi-Young; Fischer, Peter] LBNL CXRO, Berkeley, CA 94720 USA.
RP Bryan, MT (reprint author), Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England.
EM m.t.bryan@shef.ac.uk
RI MSD, Nanomag/F-6438-2012; Fischer, Peter/A-3020-2010
OI Fischer, Peter/0000-0002-9824-9343
FU EPSRC [GR/T02959/01, EP/D056683/1]; EPSRC DTA; U.S. Department of Energy
FX This work was supported by EPSRC under Grants GR/T02959/01 and
EP/D056683/1, by a EPSRC DTA studentship, and by the Director, Office of
Science, Office of Basic Energy Sciences, Materials Sciences and
Engineering Division, U.S. Department of Energy.
NR 24
TC 6
Z9 6
U1 1
U2 7
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9464
J9 IEEE T MAGN
JI IEEE Trans. Magn.
PD APR
PY 2010
VL 46
IS 4
BP 963
EP 967
DI 10.1109/TMAG.2009.2034848
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA 572TG
UT WOS:000275855400001
ER
PT J
AU Zhang, K
Kwok, JT
AF Zhang, Kai
Kwok, James T.
TI Simplifying Mixture Models Through Function Approximation
SO IEEE TRANSACTIONS ON NEURAL NETWORKS
LA English
DT Article
DE Clustering; mixture models; support vector machine (SVM) testing
ID SUPPORT VECTOR MACHINES; DENSITY-ESTIMATION; MEAN SHIFT; ALGORITHM;
RECOGNITION; TRACKING
AB The finite mixture model is widely used in various statistical learning problems. However, the model obtained may contain a large number of components, making it inefficient in practical applications. In this paper, we propose to simplify the mixture model by minimizing an upper bound of the approximation error between the original and the simplified model, under the use of the distance measure. This is achieved by first grouping similar components together and then performing local fitting through function approximation. The simplified model obtained can then be used as a replacement of the original model to speed up various algorithms involving mixture models during training (e. g., Bayesian filtering, belief propagation) and testing [e.g., kernel density estimation, support vector machine (SVM) testing]. Encouraging results are observed in the experiments on density estimation, clustering-based image segmentation, and simplification of SVM decision functions.
C1 [Zhang, Kai] Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA.
[Kwok, James T.] Hong Kong Univ Sci & Technol, Dept Comp Sci & Engn, Kowloon, Hong Kong, Peoples R China.
RP Zhang, K (reprint author), Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA.
EM kai_zhang@lbl.gov; jamesk@cse.ust.hk
FU Research Grants Council of the Hong Kong Special Administrative Region
[615209]
FX This work was supported in part by the Research Grants Council of the
Hong Kong Special Administrative Region under Grant 615209.
NR 45
TC 33
Z9 39
U1 0
U2 6
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1045-9227
EI 1941-0093
J9 IEEE T NEURAL NETWOR
JI IEEE Trans. Neural Netw.
PD APR
PY 2010
VL 21
IS 4
BP 644
EP 658
DI 10.1109/TNN.2010.2040835
PG 15
WC Computer Science, Artificial Intelligence; Computer Science, Hardware &
Architecture; Computer Science, Theory & Methods; Engineering,
Electrical & Electronic
SC Computer Science; Engineering
GA 577XJ
UT WOS:000276257000009
ER
PT J
AU Dhawan, S
Baker, O
Chen, H
Khanna, R
Kierstead, J
Lanni, F
Lynn, D
Musso, C
Rescia, S
Smith, H
Tipton, P
Weber, M
AF Dhawan, S.
Baker, O.
Chen, H.
Khanna, R.
Kierstead, J.
Lanni, F.
Lynn, D.
Musso, C.
Rescia, S.
Smith, H.
Tipton, P.
Weber, M.
TI Commercial Buck Converters and Custom Coil Development for the Atlas
Inner Detector Upgrade
SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE
LA English
DT Article; Proceedings Paper
CT 16th IEEE/NPSS Real-Time Conference
CY MAY 10-15, 2009
CL Beijing, PEOPLES R CHINA
SP IEEE, NPSS
DE DC-DC power conversion; MOSFETs; noise; radiation effects
AB A new generation of higher gain commercial buck converters built using advanced short channel CMOS processes has the potential to operate in the Atlas Inner Detector at the Super Large Hadron Collider (sLHC). This approach would inherently be more efficient than the existing practice of locating the power conversion external to the detector. The converters must operate in a large magnetic field and be able to survive both high doses of ionizing radiation and large neutron fluences. The presence of a large magnetic field necessitates the use of an air core inductor which is developed and discussed here. Noise measurements will be made to investigate the effect of the high frequency switching of the buck converter on the sensitive front end electronics. Radiation hardness of selected buck converters and mosfets will also be reported.
C1 [Dhawan, S.; Baker, O.; Smith, H.; Tipton, P.] Yale Univ, Dept Phys, New Haven, CT 06510 USA.
[Chen, H.; Kierstead, J.; Lanni, F.; Lynn, D.; Rescia, S.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
[Khanna, R.] Natl Semicond Corp, Richardson, TX 75002 USA.
[Musso, C.] NYU, Dept Phys, New York, NY 10003 USA.
[Weber, M.] Rutherford Appleton Lab, Dept Phys, Didcot OX11 0QX, Oxon, England.
RP Dhawan, S (reprint author), Yale Univ, Dept Phys, New Haven, CT 06510 USA.
EM satish.dhawan@yale.edu; oliver.baker@yale.edu; chc@bnl.gov;
ramesh.khanna@nsc.com; kirstead@bnl.gov; francesco.lanni@bnl.gov;
dlynn@bnl.gov; cm102@nyu.edu; rescia@bnl.gov; hunter.smith@yale.edu;
paul.tipton@yale.edu; m.m.weber@rl.ac.uk
RI Rescia, Sergio/D-8604-2011
OI Rescia, Sergio/0000-0003-2411-8903
NR 12
TC 0
Z9 0
U1 0
U2 3
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9499
J9 IEEE T NUCL SCI
JI IEEE Trans. Nucl. Sci.
PD APR
PY 2010
VL 57
IS 2
BP 456
EP 462
DI 10.1109/TNS.2009.2039876
PN 1
PG 7
WC Engineering, Electrical & Electronic; Nuclear Science & Technology
SC Engineering; Nuclear Science & Technology
GA 583LY
UT WOS:000276678900011
ER
PT J
AU Xiao, BJ
Ji, ZS
Shen, B
Li, GM
Wang, HZ
Wang, F
Yuan, QP
Yang, F
Sun, XY
Luo, JR
Wang, Y
Wu, YC
Zhang, RR
Luo, ZP
Dang, N
Li, S
Zhou, ZY
Wang, P
Humphreys, DA
Walker, ML
Hyatt, A
Leuer, JA
Welander, A
Johnson, RD
Penaflor, BG
Piglowski, DA
Mueller, D
AF Xiao, B. J.
Ji, Z. S.
Shen, B.
Li, G. M.
Wang, H. Z.
Wang, F.
Yuan, Q. P.
Yang, F.
Sun, X. Y.
Luo, J. R.
Wang, Y.
Wu, Y. C.
Zhang, R. R.
Luo, Z. P.
Dang, N.
Li, S.
Zhou, Z. Y.
Wang, P.
Humphreys, D. A.
Walker, M. L.
Hyatt, A.
Leuer, J. A.
Welander, A.
Johnson, R. D.
Penaflor, B. G.
Piglowski, D. A.
Mueller, D.
TI Current Status of EAST Plasma Control and Data Acquisition
SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE
LA English
DT Article; Proceedings Paper
CT 16th IEEE/NPSS Real-Time Conference
CY MAY 10-15, 2009
CL Beijing, PEOPLES R CHINA
SP IEEE, NPSS
DE EAST tokomak; data acquisition; plasma control
ID CONTROL-SYSTEM; RECONSTRUCTION; TOKAMAKS
AB This paper briefly outlines the current status of CODAC system of the EAST tokamak. Integrated central system has been working for synchronizing all the subsystems and responsible for the integral safety protection by interlock. Data acquisition system has been established for the discharge with duration up to 100 seconds. Various data visualization tools such as EASTVIEWER to view the flux surfaces, RTSCOPE to view plasma boundary and CCD image in real-time, WEBSCOPE to view the diagnostic data via a web browser and EASTVOD to view and search plasma discharge image at different time, haven developed for EAST operation. Plasma control system is inherited from DIII-D, and has been matured to a stage to feedback control the EAST plasma shape, density and current in real time.
C1 [Xiao, B. J.; Ji, Z. S.; Shen, B.; Li, G. M.; Wang, H. Z.; Wang, F.; Yuan, Q. P.; Yang, F.; Sun, X. Y.; Luo, J. R.; Wang, Y.; Wu, Y. C.; Zhang, R. R.; Luo, Z. P.; Dang, N.; Li, S.; Zhou, Z. Y.; Wang, P.] Chinese Acad Sci, Inst Plasma Phys, Hefei, Peoples R China.
[Humphreys, D. A.; Walker, M. L.; Hyatt, A.; Leuer, J. A.; Welander, A.; Johnson, R. D.; Penaflor, B. G.; Piglowski, D. A.] Gen Atom Co, DIII Natl Fus Facil D, San Diego, CA 92186 USA.
[Mueller, D.] Princeton Plasma Phys Lab, Princeton, NJ 08540 USA.
RP Xiao, BJ (reprint author), Chinese Acad Sci, Inst Plasma Phys, Hefei, Peoples R China.
EM bjxiao@ipp.ac.cn
RI Xiao, Bingjia/A-1681-2017;
OI Xiao, Bingjia/0000-0001-8692-2636; Walker, Michael/0000-0002-4341-994X
NR 19
TC 4
Z9 4
U1 2
U2 13
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9499
J9 IEEE T NUCL SCI
JI IEEE Trans. Nucl. Sci.
PD APR
PY 2010
VL 57
IS 2
BP 510
EP 514
DI 10.1109/TNS.2010.2042067
PN 1
PG 5
WC Engineering, Electrical & Electronic; Nuclear Science & Technology
SC Engineering; Nuclear Science & Technology
GA 583LY
UT WOS:000276678900020
ER
PT J
AU Deptuch, G
Christian, D
Hoff, J
Lipton, R
Shenai, A
Trimpl, M
Yarema, R
Zimmerman, T
AF Deptuch, Grzegorz
Christian, David
Hoff, James
Lipton, Ronald
Shenai, Alpana
Trimpl, Marcel
Yarema, Raymond
Zimmerman, Tom
TI A Vertically Integrated Pixel Readout Device for the Vertex Detector at
the International Linear Collider
SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE
LA English
DT Article
DE 3D-IC; CMOS; FDSOI; pixel detector; SOI; sparsified readout; TSV
AB Tracking and vertexing in future High-Energy Physics (HEP) experiments involves construction of detectors composed of up to a few billions of channels. Readout electronics must record the position and time of each measurement with the highest achievable precision. This paper reviews a prototype of the first 3D readout chip for HEP, designed for a vertex detector at the International Linear Collider. The prototype features 20 x 20 mu m(2) pixels, laid out in an array of 64 x 64 elements and was fabricated in a 3-tier 0.18 mu m Fully Depleted SOI CMOS process at MIT-Lincoln Laboratory. The tests showed correct functional operation of the structure. The chip performs a zero-suppressed readout.
C1 [Deptuch, Grzegorz; Hoff, James; Shenai, Alpana; Trimpl, Marcel; Yarema, Raymond; Zimmerman, Tom] Fermilab Natl Accelerator Lab, Dept Particle Phys Div, ASIC Microelect Grp Elect Engn, Batavia, IL 60510 USA.
[Christian, David; Lipton, Ronald] Fermilab Natl Accelerator Lab, Particle Phys Div, Batavia, IL 60510 USA.
RP Deptuch, G (reprint author), Fermilab Natl Accelerator Lab, Dept Particle Phys Div, ASIC Microelect Grp Elect Engn, BP 500, Batavia, IL 60510 USA.
EM deptuch@ieee.org; dcc@fnal.go; jhoff@fnal.gov; lipton@fnal.gov;
shenai@fnal.gov; trimpl@fnal.gov; yarema@fnal.gov; zimmerman@fnal.gov
FU U.S. Department of Energy [DE-AC02-07CH11359]; DARPA
FX Manuscript received October 05, 2009; revised November 27, 2009 and
January 18, 2010. Current version published April 14, 2010. Fermi
National Accelerator Laboratory is operated by Fermi Research Alliance,
LLC under Contract DE-AC02-07CH11359 with the U.S. Department of
Energy.; The authors would like to acknowledge the valuable
contributions of M. Turqueti and R. Rivera from the Computing Division
of FERMILAB for the development of the data acquisition system and help
in tests of the VIP1 chip. Thanks go to MIT-LL, particularly to B.
Tyrrell, for fruitful discussions and for revealing details of the 3D-IC
integration and FDSOI process. We would like to thank A. Dyer from the
ASIC testing group of FERMILAB for his dedicated and excellent
technician support. The VIP1 chip was designed and fabricated in MIT
Lincoln Laboratory's 3D-IC process, funded under the DARPA Advanced
Microelectronics Technology Development Program managed by Dr. D.
Radack.
NR 19
TC 11
Z9 11
U1 0
U2 3
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9499
J9 IEEE T NUCL SCI
JI IEEE Trans. Nucl. Sci.
PD APR
PY 2010
VL 57
IS 2
BP 880
EP 890
DI 10.1109/TNS.2010.2042301
PN 2
PG 11
WC Engineering, Electrical & Electronic; Nuclear Science & Technology
SC Engineering; Nuclear Science & Technology
GA 583MA
UT WOS:000276679200020
ER
PT J
AU Salacka, JS
Bacrania, MK
AF Salacka, Joanna S.
Bacrania, Minesh K.
TI A Comprehensive Technique for Determining the Intrinsic Light Yield of
Scintillators
SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE
LA English
DT Article
DE Gamma-ray detection; light yield; scintillator
ID OUTPUT
AB Precise knowledge of the intrinsic light yield of scintillating materials is important for characterizing, optimizing, and simulating scintillating detectors for radiation detection applications. We present here a comprehensive method for determining the intrinsic light yield of scintillating materials. By maintaining complete control over all aspects of photodetector response measurement, and through the use of a novel method for direct measurement of the light collection efficiency of the scintillator, we have successfully demonstrated that our technique allows for new levels of precision and understanding in the measurement of the intrinsic light yield of scintillating materials.
C1 [Salacka, Joanna S.] Univ Michigan, Dept Biomed Engn, Ann Arbor, MI 48109 USA.
[Salacka, Joanna S.; Bacrania, Minesh K.] Los Alamos Natl Lab, Safeguards Sci & Technol Grp N1, Los Alamos, NM 87545 USA.
RP Salacka, JS (reprint author), Univ Michigan, Dept Biomed Engn, Ann Arbor, MI 48109 USA.
EM mi-nesh@lanl.gov
FU LANL Laboratory Directed Research and Development [LA-UR 09-05486]
FX Manuscript received September 29, 2009; revised January 18, 2010.
Current version published April 14, 2010. This work was supported by
LANL Laboratory Directed Research and Development funds (LA-UR
09-05486).
NR 13
TC 13
Z9 13
U1 0
U2 5
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9499
J9 IEEE T NUCL SCI
JI IEEE Trans. Nucl. Sci.
PD APR
PY 2010
VL 57
IS 2
BP 901
EP 909
DI 10.1109/TNS.2010.2043117
PN 2
PG 9
WC Engineering, Electrical & Electronic; Nuclear Science & Technology
SC Engineering; Nuclear Science & Technology
GA 583MA
UT WOS:000276679200022
ER
PT J
AU Bolotnikov, AE
Babalola, S
Camarda, GS
Cui, YG
Egarievwe, SU
Hawrami, R
Hossain, A
Yang, G
James, RB
AF Bolotnikov, Aleksey E.
Babalola, Stephen
Camarda, Giuseppe S.
Cui, Yonggang
Egarievwe, Stephen U.
Hawrami, R.
Hossain, Anwar
Yang, Ge
James, Ralph B.
TI Te Inclusions in CZT Detectors: New Method for Correcting Their Adverse
Effects
SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE
LA English
DT Article
DE CdZnTe; crystal defects; radiation detectors
ID CDZNTE RADIATION DETECTORS; DEFECTS; GROWTH
AB Both Te inclusions and point defects can trap the charge carriers generated by ionizing particles in CdZnTe (CZT) detectors. The amount of charge trapped by point defects is proportional to the carriers' drift time and can be corrected electronically. In the case of Te inclusions, the charge loss depends upon their random locations with respect to the electron cloud. Consequently, inclusions introduce fluctuations in the charge signals, which cannot be easily corrected. In this paper, we describe direct measurements of the cumulative effect of Te inclusions and its influence on the response of CZT detectors of different thicknesses and different sizes and concentrations of Te inclusions. We also discuss a means of partially correcting their adverse effects.
C1 [Bolotnikov, Aleksey E.; Camarda, Giuseppe S.; Cui, Yonggang; Hossain, Anwar; Yang, Ge; James, Ralph B.] Brookhaven Natl Lab, Upton, NY 11793 USA.
[Babalola, Stephen] Fisk Univ, Nashville, TN 37208 USA.
[Babalola, Stephen] Vanderbilt Univ, Nashville, TN 37235 USA.
[Egarievwe, Stephen U.] Alabama A&M Univ, Normal, AL 35752 USA.
[Hawrami, R.] Radiat Monitoring Devices Inc, Watertown, MA 02472 USA.
RP Bolotnikov, AE (reprint author), Brookhaven Natl Lab, Upton, NY 11793 USA.
EM bolotnik@bnl.gov; oluseyi.s.ba-balola@vanderbilt.edu; camarda@bnl.gov;
ycui@bnl.gov; segarievwe@bnl.gov; rhawrami@bnl.gov; hos-sain@bnl.gov;
gyang@bnl.gov; rjames@bnl.gov
RI Yang, Ge/G-1354-2011
FU U.S. Department of Energy, Office of Nonproliferation Research and
Development [NA-22]; Defense Threat Reduction Agency; U.S. Department of
Energy [DE-AC02-98CH1-886]
FX Manuscript received October 19, 2009; revised December 02, 2009 and
January 12, 2010. Current version published April 14, 2010. This work
was supported by the U.S. Department of Energy, Office of
Nonproliferation Research and Development, NA-22 and Defense Threat
Reduction Agency. The manuscript was authored by Brookhaven Science
Associates, LLC under Contract DE-AC02-98CH1-886 with the U.S.
Department of Energy.
NR 13
TC 29
Z9 29
U1 0
U2 6
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9499
J9 IEEE T NUCL SCI
JI IEEE Trans. Nucl. Sci.
PD APR
PY 2010
VL 57
IS 2
BP 910
EP 919
DI 10.1109/TNS.2010.2042617
PN 2
PG 10
WC Engineering, Electrical & Electronic; Nuclear Science & Technology
SC Engineering; Nuclear Science & Technology
GA 583MA
UT WOS:000276679200023
ER
PT J
AU Wu, QS
Zhu, MX
Gu, Y
Rao, NSV
AF Wu, Qishi
Zhu, Mengxia
Gu, Yi
Rao, Nageswara S. V.
TI System Design and Algorithmic Development for Computational Steering in
Distributed Environments
SO IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS
LA English
DT Article
DE Distributed computing; computational steering; remote visualization;
performance modeling
AB Supporting visualization pipelines over wide-area networks is critical to enabling large-scale scientific applications that require visual feedback to interactively steer online computations. We propose a remote computational steering system that employs analytical models to estimate the cost of computing and communication components and optimizes the overall system performance in distributed environments with heterogeneous resources. We formulate and categorize the visualization pipeline configuration problems for maximum frame rate into three classes according to the constraints on node reuse or resource sharing, namely no, contiguous, and arbitrary reuse. We prove all three problems to be NP-complete and present heuristic approaches based on a dynamic programming strategy. The superior performance of the proposed solution is demonstrated with extensive simulation results in comparison with existing algorithms and is further evidenced by experimental results collected on a prototype implementation deployed over the Internet.
C1 [Wu, Qishi; Gu, Yi] Univ Memphis, Dept Comp Sci, Memphis, TN 38152 USA.
[Zhu, Mengxia] So Illinois Univ, Dept Comp Sci, Carbondale, IL 62901 USA.
[Rao, Nageswara S. V.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Wu, QS (reprint author), Univ Memphis, Dept Comp Sci, Memphis, TN 38152 USA.
EM qishiwu@memphis.edu; mzhu@cs.siu.edu; yigu@memphis.edu; raons@ornl.gov
OI Rao, Nageswara/0000-0002-3408-5941
FU US National Science Foundation [CNS-0721980]; Oak Ridge National
Laboratory; US Department of Energy [PO 4000056349]; University of
Memphis; Southern Illinois University, Carbondale. [PO 6400006042]
FX The authors would like to thank Anne Benoit and Yves Robert at ENS Lyon
for their help with the NP-completeness proof. The authors would also
like to thank the anonymous reviewers for their constructive comments
that considerably improved the quality of this paper. This research is
sponsored by the US National Science Foundation under Grant No.
CNS-0721980 and the Oak Ridge National Laboratory, US Department of
Energy, under Contract No. PO 4000056349 with the University of Memphis
and Contract No. PO 6400006042 with Southern Illinois University,
Carbondale.
NR 23
TC 0
Z9 0
U1 1
U2 8
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA
SN 1045-9219
EI 1558-2183
J9 IEEE T PARALL DISTR
JI IEEE Trans. Parallel Distrib. Syst.
PD APR
PY 2010
VL 21
IS 4
BP 438
EP 451
DI 10.1109/TPDS.2009.81
PG 14
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA 559BH
UT WOS:000274794200003
ER
PT J
AU Bott, SC
Chittenden, JP
Coverdale, CA
Giuliani, JL
AF Bott, Simon C.
Chittenden, Jeremy P.
Coverdale, Christine A.
Giuliani, John L.
TI Special Issue on Z-Pinch Plasmas
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Editorial Material
C1 [Bott, Simon C.] Univ Calif San Diego, La Jolla, CA 92093 USA.
[Chittenden, Jeremy P.] Univ London Imperial Coll Sci Technol & Med, London SW7 2BW, England.
[Coverdale, Christine A.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Giuliani, John L.] USN, Res Lab, Washington, DC 20375 USA.
RP Bott, SC (reprint author), Univ Calif San Diego, La Jolla, CA 92093 USA.
NR 0
TC 0
Z9 0
U1 0
U2 2
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 526
EP 528
DI 10.1109/TPS.2010.2043761
PN 1
PG 3
WC Physics, Fluids & Plasmas
SC Physics
GA 581NV
UT WOS:000276531600001
ER
PT J
AU Jennings, CA
Chittenden, JP
Cuneo, ME
Stygar, WA
Ampleford, DJ
Waisman, EM
Jones, M
Savage, ME
LeChien, KR
Wagoner, TC
AF Jennings, Chris A.
Chittenden, Jeremy P.
Cuneo, Michael E.
Stygar, W. A.
Ampleford, David J.
Waisman, E. M.
Jones, M.
Savage, M. E.
LeChien, K. R.
Wagoner, T. C.
TI Circuit Model for Driving Three-Dimensional Resistive MHD Wire Array
Z-Pinch Calculations
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article; Proceedings Paper
CT 51st American-Physics-Society-Division-of-Plasma-Physics Meeting
CY NOV 02-06, 2009
CL Atlanta, GA
SP Amer Phys Soc Div Plasma Phys
DE Convolute; current loss; electron flow; Z-pinch
ID IN-CELL SIMULATIONS; FLOW; ACCELERATOR
AB Compact tungsten wire array Z-pinches imploded on the Z generator at Sandia National Laboratories have proven to be a powerful reproducible X-ray source. Wire arrays have also been used in dynamic hohlraum radiation flow experiments and as an intense K-shell source, while the generator has been used extensively for isentropic compression experiments. A problem shared by all these applications is current loss, preventing the similar to 20-MA drive current from being reliably coupled to the load. This potentially degrades performance, while uncertainties in how this loss is described limit our predictive capability. We present details of a transmission line equivalent circuit model of the Z generator for use in driving 3-D resistive MHD simulations of wire array loads. We describe how power delivery to these loads is affected by multiple current losses and demonstrate how these may be calculated or reconstructed from available electrical data for inclusion in the circuit model. We then demonstrate how the circuit model and MHD load calculation may be combined to infer an additional current loss that has not been directly diagnosed for wire arrays.
C1 [Jennings, Chris A.; Cuneo, Michael E.; Stygar, W. A.; Ampleford, David J.; Waisman, E. M.; Jones, M.; Savage, M. E.; LeChien, K. R.; Wagoner, T. C.] Sandia Natl Labs, Albuquerque, NM 87104 USA.
[Chittenden, Jeremy P.] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Plasma Phys Grp, London SW7 2AZ, England.
RP Jennings, CA (reprint author), Sandia Natl Labs, Albuquerque, NM 87104 USA.
EM cjennin@sandia.gov; j.chittenden@imperial.ac.uk; mecuneo@sandia.gov;
damplef@sandia.gov; emwaism@sandia.gov; micjone@sandia.gov;
mesavag@sandia.gov; krlechi@sandia.gov; tcwagon@sandia.gov
NR 25
TC 23
Z9 28
U1 1
U2 6
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 529
EP 539
DI 10.1109/TPS.2010.2042971
PN 1
PG 11
WC Physics, Fluids & Plasmas
SC Physics
GA 581NV
UT WOS:000276531600002
ER
PT J
AU Coverdale, CA
LePell, PD
Deeney, C
Beutler, DE
Jones, SC
Chantler, G
Greenwoll, J
Chittenden, JP
Bateson, T
Dudley, KJ
Cuneo, ME
AF Coverdale, Christine A.
LePell, P. David
Deeney, Christopher
Beutler, David E.
Jones, Scott C.
Chantler, Gary
Greenwoll, J.
Chittenden, J. P.
Bateson, T.
Dudley, K. J.
Cuneo, Michael E.
TI Investigations of Azimuthal Uniformity, Radial Extrapolation, and
View-Factor Corrections for Yield Measurements of K-Shell X-Ray Sources
at the Z Accelerator
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article; Proceedings Paper
CT 51st Annual Meeting of the Division-of-Plasma-Physics of the
American-Physics-Society
CY NOV 02-06, 2009
CL Atlanta, GA
SP Amer Phys Soc, Div Plasma Phys
DE K-shell radiation; plasma measurements; plasma pinch; X-ray measurements
ID Z-PINCH; IMPLOSIONS; PHYSICS; NUMBER
AB Z-pinch experiments at pulsed-power facilities generally field a wide range of diagnostics, designed to make measurements and study the relevant physics during all phases of the Z-pinch. Optical and X-ray images are collected to study ablation, implosion, and the stagnated pinch; yield and power measurements are made at various photon energies; and time-integrated and time-resolved spectroscopies are recorded to infer plasma conditions before, during, and after stagnation. Typically, diagnostics fielded are dispersed azimuthally around the Z-pinch and at varying distances relative to the Z-pinch. The data are then analyzed and interpreted as a single entity to provide detailed information about a particular process or physics effect. Correlation of the results of the individual diagnostics in this fashion assumes that each diagnostic would measure the same result regardless of its azimuthal or radial location. Assessments of diagnostics to measure K-shell yield at the Z accelerator, which are fielded at varying azimuthal locations and radial distances, are presented. These measurements illustrate that the K-shell emission is azimuthally uniform for titanium, stainless-steel, and copper wire arrays and that the standard correction for radial distance is valid. The importance of view-factor corrections is also discussed.
C1 [Coverdale, Christine A.; Beutler, David E.; Jones, Scott C.; Greenwoll, J.; Cuneo, Michael E.] Sandia Natl Labs, Albuquerque, NM 87123 USA.
[LePell, P. David] Ktech Corp Inc, Albuquerque, NM 87123 USA.
[Deeney, Christopher] Natl Nucl Secur Adm, Dept Energy, Washington, DC 20585 USA.
[Chantler, Gary] Lmata Govt Serv, Albuquerque, NM 87109 USA.
[Chittenden, J. P.] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, London SW7 2BZ, England.
[Bateson, T.; Dudley, K. J.] Atom Weap Estab, Aldermaston RG7 4PR, England.
RP Coverdale, CA (reprint author), Sandia Natl Labs, Albuquerque, NM 87123 USA.
EM cacover@sandia.gov
NR 26
TC 0
Z9 0
U1 0
U2 1
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
EI 1939-9375
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 589
EP 597
DI 10.1109/TPS.2009.2038782
PN 1
PG 9
WC Physics, Fluids & Plasmas
SC Physics
GA 581NV
UT WOS:000276531600009
ER
PT J
AU Dasgupta, A
Giuliani, JL
Davis, J
Clark, RW
Coverdale, CA
Jones, B
Ampleford, DJ
AF Dasgupta, Arati
Giuliani, John L.
Davis, Jack
Clark, Robert W.
Coverdale, Christine A.
Jones, Brent
Ampleford, David J.
TI Time-Integrated Synthetic X-Ray Spectroscopy for Stainless Steel Wire
Array Z-Pinches
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article; Proceedings Paper
CT 51st American-Physics-Society-Division-of-Plasma-Physics Meeting
CY NOV 02-06, 2009
CL Atlanta, GA
SP Amer Phys Soc Div Plasma Phys
DE Dielectronic recombination (DR); plasma diagnostics; X-ray spectra;
Z-pinch
ID DIELECTRONIC RECOMBINATION; IONIZATION; SELENIUM; PLASMAS; IMPACT
AB We have used a collisional-radiative spectroscopic model to generate a stainless steel (SS) atomic model to analyze the implosion dynamics of an array of SS wires on the Z and/or refurbished Z accelerator at the U. S. Sandia National Laboratories. This approach combines the completeness of highly averaged Rydberg state models with the accuracy of detailed models for all important excited states. Our atomic model includes a very large number of levels and atomic structure data, as well as excitation, ionization, and recombination level coupling. We have investigated the ionization dynamics and generated K-and L-shell spectra using the conditions in the Z accelerator, as calculated by a 1-D nonlocal thermodynamic equilibrium (LTE) radiation hydrodynamics model. This investigation using more detailed and accurate atomic models supersedes earlier spectroscopic simulation of K-shell SS spectra to analyze spectra on the Z accelerator. The non-LTE populations are obtained by generating the detailed atomic data for Fe, Ni, and Cr, and Mn ions, the constituents of SS. Analysis of our spectra using self-consistently generated data from the flexible atomic code shows excellent agreement with experimental data of shots Z581 and Z1860. We have also included level-specific dielectronic recombination from H-to He-like ions and inner-shell excitation rates from excited states of He-like ions in our atomic model and investigated the Ly(alpha) satellite lines that are useful for diagnosing Doppler broadening in a Z-pinch plasma at stagnation.
C1 [Dasgupta, Arati; Giuliani, John L.; Davis, Jack] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA.
[Clark, Robert W.] Berkeley Res Associates Inc, Beltsville, MD 20705 USA.
[Coverdale, Christine A.; Jones, Brent; Ampleford, David J.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Dasgupta, A (reprint author), USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA.
EM Arati.Dasgupta@nrl.navy.mil; john.giuliani@nrl.navy.mil;
jack.davis@nrl.navy.mil; robert.clark@nrl.navy.mil; cacover@sandia.gov;
bmjones@sandia.gov; damplef@sandia.gov
NR 16
TC 5
Z9 5
U1 0
U2 1
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 598
EP 605
DI 10.1109/TPS.2010.2040841
PN 1
PG 8
WC Physics, Fluids & Plasmas
SC Physics
GA 581NV
UT WOS:000276531600010
ER
PT J
AU Thornhill, JW
Giuliani, JL
Dasgupta, A
Apruzese, JP
Davis, J
Chong, YK
Jennings, CA
Ampleford, DA
Jones, B
Coverdale, CA
Jones, MC
Cuneo, ME
Stygar, WA
AF Thornhill, J. Ward
Giuliani, John L.
Dasgupta, Arati
Apruzese, John P.
Davis, Jack
Chong, Young K.
Jennings, Christopher A.
Ampleford, Dave A.
Jones, Brent
Coverdale, Christine A.
Jones, M. C.
Cuneo, Michael E.
Stygar, W. A.
TI Two-Dimensional Radiation MHD K-Shell Modeling of Stainless-Steel
Double-Wire-Array Experiments on the Refurbished Z Machine
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article; Proceedings Paper
CT 51st American-Physics-Society-Division-of-Plasma-Physics Meeting
CY NOV 02-06, 2009
CL Atlanta, GA
SP Amer Phys Soc Div Plasma Phys
DE K-shell radiation; magnetohydrodynamics (MHD); plasma pinch; X-ray
production
ID Z-PINCH IMPLOSIONS; ATOMIC-NUMBER; Z-ACCELERATOR; SIMULATIONS;
INSTABILITY; TRANSPORT; DYNAMICS; PHYSICS; PLASMA; POWER
AB Two-dimensional (r, z) magnetohydrodynamic simulations with nonlocal thermodynamic equilibrium ionization and radiation transport are used to investigate the K-shell radiation output from doubly nested large-diameter (> 60 mm) stainless-steel arrays fielded on the refurbished Z pulsed-power generator. The effects of the initial density perturbations, wire ablation rate, and current loss near the load on the total power, K-shell power, and K-shell yield are examined. The broad mass distribution produced by wire ablation largely overcomes the deleterious impact on the K-shell power and yield of 2-D instability growth. On the other hand, the possible current losses in the final feed section lead to substantial reductions in K-shell yield. Following a survey of runs, the parameters for the perturbation level, ablation rate, and current loss are chosen to benchmark the simulations against existing 65-mm-diameter radiation data. The model is then used to predict the K-shell properties of larger diameter (70 mm) arrays to be imploded on the Z generator.
C1 [Thornhill, J. Ward; Giuliani, John L.; Dasgupta, Arati; Apruzese, John P.; Davis, Jack; Chong, Young K.] USN, Res Lab, Washington, DC 20375 USA.
[Jennings, Christopher A.; Ampleford, Dave A.; Jones, Brent; Coverdale, Christine A.; Jones, M. C.; Cuneo, Michael E.; Stygar, W. A.] Sandia Natl Labs, Albuquerque, NM 87104 USA.
RP Thornhill, JW (reprint author), USN, Res Lab, Washington, DC 20375 USA.
NR 41
TC 4
Z9 4
U1 0
U2 1
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 606
EP 617
DI 10.1109/TPS.2010.2041473
PN 1
PG 12
WC Physics, Fluids & Plasmas
SC Physics
GA 581NV
UT WOS:000276531600011
ER
PT J
AU Moses, EI
AF Moses, E. I.
TI The National Ignition Facility and the National Ignition Campaign
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article; Proceedings Paper
CT 36th IEEE International Conference on Plasma Science
CY MAY 31-JUN 05, 2009
CL San Diego, CA
SP IEEE
DE High-energy-density (HED) science; inertial confinement fusion (ICF);
inertial fusion energy (IFE); laser IFE; National Ignition Campaign
(NIC); National Ignition Facility (NIF)
AB The National Ignition Facility (NIF), the world's largest and most powerful laser system for inertial confinement fusion (ICF) and experiments studying high-energy-density (HED) science, is now operational at Lawrence Livermore National Laboratory (LLNL). NIF construction was certified by the Department of Energy as complete on March 27, 2009. NIF, a 192-beam Nd:glass laser facility, will ultimately produce 1.8 MJ 500 TW of 351-nm third-harmonic ultraviolet light. On March 10, 2009, a total of 192-beam energy of 1.1 MJ was demonstrated; this is approximately 30 times more energy than ever produced in an ICF laser system. The principal goal of NIF is to achieve ignition of a deuterium-tritium (DT) fuel capsule and provide access to HED physics regimes needed for experiments related to national security, fusion energy, and broader frontier scientific exploration. NIF experiments in support of indirect-drive ignition began in August 2009. These first experiments represent the next phase of the National Ignition Campaign (NIC). The NIC is a national effort to achieve fusion ignition and is coordinated through a detailed execution plan that includes science, technology, and equipment. The equipment required for ignition experiments includes diagnostics, a cryogenic target manipulator, and user optics. Participants in this effort include LLNL, General Atomics, Los Alamos National Laboratory, Sandia National Laboratory, and the University of Rochester Laboratory for Energetics. The primary goal for NIC is to have all of the equipment operational, integrated into the facility, and ready to begin a credible ignition campaign in 2010. With NIF now operational, the long-sought goal of achieving self-sustained nuclear fusion and energy gain in the laboratory is much closer to realization. Successful demonstration of ignition and net energy gain on NIF will be a major step toward demonstrating the feasibility of inertial fusion energy (IFE) and will likely focus the world's attention on the possibility of an ICF energy option. NIF experiments to demonstrate ignition and gain will use central-hot-spot (CHS) ignition, where a spherical fuel capsule is simultaneously compressed and ignited. The scientific basis for CHS has been intensively developed. Achieving ignition with CHS will open the door for other advanced concepts, such as the use of high-yield pulses of visible wavelength rather than ultraviolet and fast-ignition concepts. Moreover, NIF will have important scientific applications in such diverse fields as astrophysics, nuclear physics, and materials science. The NIC will develop the full set of capabilities required to operate NIF as a major national and international user facility. A solicitation for NIF frontier science experiments is planned for summer 2009. This paper summarizes the design, performance, and status of NIF and plans for the NIF ignition experimental program. A brief summary of the overall NIF experimental program is also presented.
C1 Lawrence Livermore Natl Lab, Livermore, CA 94450 USA.
RP Moses, EI (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94450 USA.
NR 14
TC 30
Z9 37
U1 1
U2 28
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 684
EP 689
DI 10.1109/TPS.2010.2042466
PN 2
PG 6
WC Physics, Fluids & Plasmas
SC Physics
GA 581OC
UT WOS:000276532400002
ER
PT J
AU Sethian, JD
Colombant, DG
Giuliani, JL
Lehmberg, RH
Myers, MC
Obenschain, SP
Schmitt, AJ
Weaver, J
Wolford, MF
Hegeler, F
Friedman, M
Robson, AE
Bayramian, A
Caird, J
Ebbers, C
Latkowski, J
Hogan, W
Meier, WR
Perkins, LJ
Schaffers, K
Kahlik, SA
Schoonover, K
Sadowski, D
Boehm, K
Carlson, L
Pulsifer, J
Najmabadi, F
Raffray, AR
Tillack, MS
Kulcinski, G
Blanchard, JP
Heltemes, T
Ibrahim, A
Marriott, E
Moses, G
Radell, R
Sawan, M
Santarius, J
Sviatoslavsky, G
Zenobia, S
Ghoniem, NM
Sharafat, S
El-Awady, J
Hu, Q
Duty, C
Leonard, K
Romanoski, G
Snead, LL
Zinkle, SJ
Gentile, C
Parsells, W
Prinksi, C
Kozub, T
Dodson, T
Rose, DV
Renk, T
Olson, C
Alexander, N
Bozek, A
Flint, G
Goodin, DT
Hund, J
Paguio, R
Petzoldt, RW
Schroen, DG
Sheliak, J
Bernat, T
Bittner, D
Karnes, J
Petta, N
Streit, J
Geller, D
Hoffer, JK
McGeoch, MW
Glidden, SC
Sanders, H
Weidenheimer, D
Morton, D
Smith, ID
Bobecia, M
Harding, D
Lehecka, T
Gilliam, SB
Gidcumb, SM
Forsythe, D
Parikh, NR
O'Dell, S
Gorensek, M
AF Sethian, J. D.
Colombant, D. G.
Giuliani, J. L., Jr.
Lehmberg, R. H.
Myers, M. C.
Obenschain, S. P.
Schmitt, A. J.
Weaver, J.
Wolford, M. F.
Hegeler, F.
Friedman, M.
Robson, A. E.
Bayramian, A.
Caird, J.
Ebbers, C.
Latkowski, J.
Hogan, W.
Meier, W. R.
Perkins, L. J.
Schaffers, K.
Kahlik, S. Abdel
Schoonover, K.
Sadowski, D.
Boehm, K.
Carlson, L.
Pulsifer, J.
Najmabadi, F.
Raffray, A. R.
Tillack, M. S.
Kulcinski, G.
Blanchard, J. P.
Heltemes, T.
Ibrahim, A.
Marriott, E.
Moses, G.
Radell, R.
Sawan, M.
Santarius, J.
Sviatoslavsky, G.
Zenobia, S.
Ghoniem, N. M.
Sharafat, S.
El-Awady, J.
Hu, Q.
Duty, C.
Leonard, K.
Romanoski, G.
Snead, L. L.
Zinkle, S. J.
Gentile, C.
Parsells, W.
Prinksi, C.
Kozub, T.
Dodson, T.
Rose, D. V.
Renk, T.
Olson, C.
Alexander, N.
Bozek, A.
Flint, G.
Goodin, D. T.
Hund, J.
Paguio, R.
Petzoldt, R. W.
Schroen, D. G.
Sheliak, J.
Bernat, T.
Bittner, D.
Karnes, J.
Petta, N.
Streit, J.
Geller, D.
Hoffer, J. K.
McGeoch, M. W.
Glidden, S. C.
Sanders, H.
Weidenheimer, D.
Morton, D.
Smith, I. D.
Bobecia, M.
Harding, D.
Lehecka, T.
Gilliam, S. B.
Gidcumb, S. M.
Forsythe, D.
Parikh, N. R.
O'Dell, S.
Gorensek, M.
TI The Science and Technologies for Fusion Energy With Lasers and
Direct-Drive Targets
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article; Proceedings Paper
CT 36th IEEE International Conference on Plasma Science
CY MAY 31-JUN 05, 2009
CL San Diego, CA
SP IEEE
DE Fusion power generation; fusion reactors; laser amplifiers; laser
fusion; magnetic fields; nanotechnology; optical tracking
ID INERTIAL CONFINEMENT FUSION; HELIUM IMPLANTED TUNGSTEN; HIGH AVERAGE
POWER; DRY WALL CHAMBERS; MAGNETIC INTERVENTION; IFE CONDITIONS; PLANT;
GAS; REACTOR; DESIGN
AB We are carrying out a multidisciplinary multi-institutional program to develop the scientific and technical basis for inertial fusion energy (IFE) based on laser drivers and direct-drive targets. The key components are developed as an integrated system, linking the science, technology, and final application of a 1000-MWe pure-fusion power plant. The science and technologies developed here are flexible enough to be applied to other size systems. The scientific justification for this work is a family of target designs (simulations) that show that direct drive has the potential to provide the high gains needed for a pure-fusion power plant. Two competing lasers are under development: the diode-pumped solid-state laser (DPPSL) and the electron-beam-pumped krypton fluoride (KrF) gas laser. This paper will present the current state of the art in the target designs and lasers, as well as the other IFE technologies required for energy, including final optics (grazing incidence and dielectrics), chambers, and target fabrication, injection, and tracking technologies. All of these are applicable to both laser systems and to other laser IFE-based concepts. However, in some of the higher performance target designs, the DPPSL will require more energy to reach the same yield as with the KrF laser.
C1 [Sethian, J. D.; Colombant, D. G.; Giuliani, J. L., Jr.; Lehmberg, R. H.; Myers, M. C.; Obenschain, S. P.; Schmitt, A. J.; Weaver, J.; Wolford, M. F.] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA.
[Hegeler, F.; Friedman, M.; Robson, A. E.] Commonwealth Technol Inc, Alexandria, VA 22315 USA.
[Bayramian, A.; Caird, J.; Ebbers, C.; Latkowski, J.; Hogan, W.; Meier, W. R.; Perkins, L. J.; Schaffers, K.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
[Kahlik, S. Abdel; Schoonover, K.; Sadowski, D.] Georgia Inst Technol, Atlanta, GA 30332 USA.
[Boehm, K.; Carlson, L.; Pulsifer, J.; Najmabadi, F.; Raffray, A. R.; Tillack, M. S.] Univ Calif San Diego, La Jolla, CA 92093 USA.
[Kulcinski, G.; Blanchard, J. P.; Heltemes, T.; Ibrahim, A.; Marriott, E.; Moses, G.; Radell, R.; Sawan, M.; Santarius, J.; Sviatoslavsky, G.; Zenobia, S.] Univ Wisconsin, Madison, WI 53706 USA.
[Ghoniem, N. M.; Sharafat, S.; El-Awady, J.; Hu, Q.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA.
[Duty, C.; Leonard, K.; Romanoski, G.; Snead, L. L.; Zinkle, S. J.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
[Gentile, C.; Parsells, W.; Prinksi, C.; Kozub, T.; Dodson, T.] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
[Rose, D. V.] Voss Sci, Albuquerque, NM 87108 USA.
[Renk, T.; Olson, C.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Alexander, N.; Bozek, A.; Flint, G.; Goodin, D. T.; Hund, J.; Paguio, R.; Petzoldt, R. W.; Schroen, D. G.; Sheliak, J.] Gen Atom Co, San Diego, CA 92121 USA.
[Bernat, T.; Bittner, D.; Karnes, J.; Petta, N.; Streit, J.] Schafer Corp, Livermore, CA 94551 USA.
[Geller, D.; Hoffer, J. K.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Glidden, S. C.; Sanders, H.] Appl Pulsed Power Inc, Freeville, NY 13068 USA.
[McGeoch, M. W.] PLEX Corp, Brookline, MA 02146 USA.
[Weidenheimer, D.; Morton, D.; Smith, I. D.] L3 Pulse Sci Inc, San Leandro, CA 94577 USA.
[Bobecia, M.; Harding, D.] Univ Rochester, Laser Energet Lab, Rochester, NY 14623 USA.
[Lehecka, T.] Penn State Electroopt Ctr, State Coll, PA 16229 USA.
[Gilliam, S. B.; Gidcumb, S. M.; Forsythe, D.; Parikh, N. R.] Univ N Carolina, Chapel Hill, NC 27514 USA.
[Gorensek, M.] Savannah River Natl Lab, Aiken, SC 29808 USA.
[O'Dell, S.] Plasma Proc Inc, Huntsville, AL 35811 USA.
RP Sethian, JD (reprint author), USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA.
RI El-Awady, Jaafar/A-8020-2010; Gorensek, Maximilian/B-5298-2012;
El-Awady, Jaafar/E-8551-2010; Wolford, Matthew/D-5834-2013; Romanoski,
Glenn/E-5703-2017;
OI El-Awady, Jaafar/0000-0002-5715-2481; Wolford,
Matthew/0000-0002-8624-1336; Romanoski, Glenn/0000-0002-6874-5071;
Gorensek, Maximilian/0000-0002-4322-9062; Zinkle,
Steven/0000-0003-2890-6915; Geller, Drew/0000-0001-8046-8495; Karnes,
John/0000-0002-2917-8406
NR 80
TC 25
Z9 27
U1 3
U2 44
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 690
EP 703
DI 10.1109/TPS.2009.2037629
PN 2
PG 14
WC Physics, Fluids & Plasmas
SC Physics
GA 581OC
UT WOS:000276532400003
ER
PT J
AU Mazarakis, MG
Fowler, WE
LeChien, KL
Long, FW
Matzen, MK
McDaniel, DH
McKee, RG
Olson, CL
Porter, JL
Rogowski, ST
Struve, KW
Stygar, WA
Woodworth, JR
Kim, AA
Sinebryukhov, VA
Gilgenbach, RM
Gomez, MR
French, DM
Lau, YY
Zier, JC
VanDevalde, DM
Sharpe, RA
Ward, K
AF Mazarakis, Michael G.
Fowler, William E.
LeChien, K. L.
Long, Finis W.
Matzen, M. Keith
McDaniel, D. H.
McKee, R. G.
Olson, C. L.
Porter, J. L.
Rogowski, S. T.
Struve, Kenneth W.
Stygar, W. A.
Woodworth, Joe R.
Kim, Alexander A.
Sinebryukhov, Vadim A.
Gilgenbach, Ronald M.
Gomez, M. R.
French, D. M.
Lau, Y. Y.
Zier, Jacob C.
VanDevalde, D. M.
Sharpe, R. A.
Ward, K.
TI High-Current Linear Transformer Driver Development at Sandia National
Laboratories
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article; Proceedings Paper
CT 36th IEEE International Conference on Plasma Science
CY MAY 31-JUN 05, 2009
CL San Diego, CA
SP IEEE
DE Accelerators; high-current devices; linear transformer drivers (LTDs);
pulsed power
AB Most of the modern high-current high-voltage pulsed power generators require several stages of pulse conditioning (pulse forming) to convert the multimicrosecond pulses of the Marx generator output to the 40-300-ns pulses required by a number of applications including X-ray radiography, pulsed high-current linear accelerators, Z-pinch, isentropic compression, and inertial fusion energy drivers. This makes the devices large, cumbersome to operate, and expensive. Sandia, in collaboration with a number of other institutions, is developing a new paradigm in pulsed power technology: the linear transformer driver (LTD) technology. This technological approach can provide very compact devices that can deliver very fast high-current and high-voltage pulses. The output pulse rise time and width can be easily tailored to the specific application needs. Trains of a large number of high-current pulses can be produced with variable interpulse separation from nanoseconds to milliseconds. Most importantly, these devices can be rep-rated to frequencies only limited by the capacitor specifications (usually 10 Hz). Their footprint, as compared with current day pulsed power accelerators, is considerably smaller since LTD do not require large oil and deionized water tanks. This makes them ideally suited for applications that require portability. In this paper, we present Sandia National Laboratories' broad spectrum of developmental effort to design construct and extensively validate the LTD pulsed power technology.
C1 [Mazarakis, Michael G.; Fowler, William E.; LeChien, K. L.; Long, Finis W.; Matzen, M. Keith; McDaniel, D. H.; McKee, R. G.; Olson, C. L.; Porter, J. L.; Rogowski, S. T.; Struve, Kenneth W.; Stygar, W. A.; Woodworth, Joe R.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Gilgenbach, Ronald M.; Gomez, M. R.; French, D. M.; Lau, Y. Y.; Zier, Jacob C.] Univ Michigan, Ann Arbor, MI 48109 USA.
[VanDevalde, D. M.] EG&G, Albuquerque, NM 87107 USA.
[Sharpe, R. A.; Ward, K.] Ktech Corp Inc, Albuquerque, NM 87123 USA.
[Kim, Alexander A.; Sinebryukhov, Vadim A.] Inst High Current Elect, Tomsk 634055, Russia.
RP Mazarakis, MG (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM mgmazar@sandia.gov
NR 15
TC 36
Z9 43
U1 1
U2 17
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 704
EP 713
DI 10.1109/TPS.2009.2035318
PN 2
PG 10
WC Physics, Fluids & Plasmas
SC Physics
GA 581OC
UT WOS:000276532400004
ER
PT J
AU Tang, V
Adams, ML
Rusnak, B
AF Tang, V.
Adams, M. L.
Rusnak, B.
TI Dense Plasma Focus Z-Pinches for High-Gradient Particle Acceleration
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article; Proceedings Paper
CT 36th IEEE International Conference on Plasma Science
CY MAY 31-JUN 05, 2009
CL San Diego, CA
SP IEEE
DE Accelerators; neutron sources; particle beams; plasma applications;
plasma focus; plasma pinch; plasma sheaths
ID NEUTRON-PRODUCTION; ION-ACCELERATION; ENERGY-SPECTRA; BEAM; ELECTRON;
DEVICE; DISCHARGES; EMISSION; PERSPECTIVES; MECHANISM
AB The final Z-pinch stage of a dense plasma focus (DPF) could be used as a simple, compact, and potentially rugged plasma-based high-gradient accelerator with fields at the 100-MV/m level. In this paper, we review previously published experimental beam data that indicate the feasibility of such a DPF-based accelerator, qualitatively discuss the physical acceleration processes in terms of the induced voltages, and as a starting point, examine the DPF acceleration potential by numerically applying a self-consistent DPF system model that includes the induced voltage from both macroscopic and instability-driven plasma dynamics. Applications to the remote detection of high explosives and a multistaged acceleration concept are briefly discussed.
C1 [Tang, V.; Adams, M. L.; Rusnak, B.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Tang, V (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
EM tang23@llnl.gov
NR 58
TC 4
Z9 4
U1 2
U2 11
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
SI SI
BP 719
EP 727
DI 10.1109/TPS.2009.2037504
PN 2
PG 9
WC Physics, Fluids & Plasmas
SC Physics
GA 581OC
UT WOS:000276532400006
ER
PT J
AU Webb, TJ
Hahn, KD
Johnston, MD
Oliver, BV
Welch, DR
AF Webb, Timothy J.
Hahn, Kelly D.
Johnston, Mark D.
Oliver, Bryan V.
Welch, Dale R.
TI Energy and Current Density Measurements of RITS-6 Large-Area Diode
Electron Beam
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Beam diagnostics; depth-dose measurements; induction voltage adders;
intense relativistic electron beams
AB The depth-dose measurements of Radiographic Integrated Test Stand-6 large-area diode electron beam operating at approximately 10-MV peak voltage suggest a 10 +/- 0.5-MeV equivalent monoenergetic electron beam. The unfolded electron spectrum reveals electrons > 1 MeV above the peak magnetically insulated transmission line voltage. The 1-D slices of the beam spatial profile obtained in the depth-dose measurements observe greater than 20% nonuniformity in the beam current density. The time-resolved measurements of the beam current density profile using images of beam-generated Cerenkov light show 2-D nonuniformities in the beam current density that change slowly during the 60-ns pulse, which do not depend strongly on the cathode surface condition.
C1 [Webb, Timothy J.; Hahn, Kelly D.; Johnston, Mark D.; Oliver, Bryan V.] Sandia Natl Labs, Adv Radiog Technol Dept, Albuquerque, NM 87185 USA.
RP Webb, TJ (reprint author), Sandia Natl Labs, Adv Radiog Technol Dept, POB 5800, Albuquerque, NM 87185 USA.
EM tjwebb@sandia.gov; kdhahn@sandia.gov; mdjohn@sandia.gov;
bvolive@sandia.gov; dalew@vosssci.com
FU Sandia [DE-AC04-94AL85000]
FX First published March 4, 2010; current version published April 9, 2010.
This work was supported by Sandia, which is a multiprogram laboratory
operated by Sandia Corporation, a Lockheed Martin Company, for the U. S.
Department of Energy's National Nuclear Security Administration under
Contract DE-AC04-94AL85000.
NR 10
TC 0
Z9 0
U1 1
U2 4
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
BP 923
EP 932
DI 10.1109/TPS.2010.2042306
PN 4
PG 10
WC Physics, Fluids & Plasmas
SC Physics
GA 581ON
UT WOS:000276533600004
ER
PT J
AU Kotulski, JD
Coats, RS
Pasik, MF
Ulrickson, M
AF Kotulski, Joseph D.
Coats, Rebecca S.
Pasik, Michael F.
Ulrickson, Michael
TI Electromagnetic Analysis of Forces and Torques on the Baseline and
Enhanced ITER Shield Modules due to Plasma Disruption
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Eddy-current analysis; electromagnetic-force computation; ITER
AB An electromagnetic analysis is performed on the ITER shield modules under different plasma-disruption scenarios using the OPERA-3d software. The models considered include the baseline design as provided by the International Organization and an enhanced design that includes the more realistic geometrical features of a shield module. The modeling procedure is explained, electromagnetic torques are presented, and results of the modeling are discussed.
C1 [Kotulski, Joseph D.; Coats, Rebecca S.; Pasik, Michael F.; Ulrickson, Michael] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Kotulski, JD (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM jdkotul@sandia.gov
NR 4
TC 8
Z9 8
U1 0
U2 2
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
BP 1047
EP 1051
DI 10.1109/TPS.2010.2041364
PN 4
PG 5
WC Physics, Fluids & Plasmas
SC Physics
GA 581ON
UT WOS:000276533600023
ER
PT J
AU Diamant, KD
Pollard, JE
Raitses, Y
Fisch, NJ
AF Diamant, Kevin D.
Pollard, James E.
Raitses, Yevgeny
Fisch, Nathaniel J.
TI Ionization, Plume Properties, and Performance of Cylindrical Hall
Thrusters
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Charge state; Hall thruster; ion flux; performance; plume
AB It is shown experimentally that the cylindrical Hall thruster (CHT) produces a highly ionized plasma flow with mass utilization efficiencies greater than 100% due to generation of multicharged ions. For the CHT employing geometries with and without a short annular section, used to enhance ionization, plume divergence reductions of approximately 25% were demonstrated by running a cathode-keeper discharge along with the main cathode-anode discharge. Thruster anode efficiencies varied from approximately 15% to 35% over input powers from 70 to 220 W. A 2-A keeper discharge resulted in an approximately 20% increase in anode specific impulse for both geometries, and the specific impulse for the case of no annular section was, on average, 13% higher than that with the annular section. The multicharged ion fraction increased with keeper current, and the quantity of channel erosion products in the plume was correlated with that of multicharged ions.
C1 [Diamant, Kevin D.; Pollard, James E.] Aerosp Corp, El Segundo, CA 90245 USA.
[Raitses, Yevgeny; Fisch, Nathaniel J.] Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA.
RP Diamant, KD (reprint author), Aerosp Corp, El Segundo, CA 90245 USA.
EM kevin.d.diamant@aero.org; james.e.pollard@aero.org; yraitses@pppl.gov;
fisch@princeton.edu
FU Aerospace Corporation
FX First published March 18, 2010; current version published April 9, 2010.
This work was supported by The Aerospace Corporation's Independent
Research and Development Program.
NR 33
TC 11
Z9 12
U1 1
U2 10
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD APR
PY 2010
VL 38
IS 4
BP 1052
EP 1057
DI 10.1109/TPS.2010.2042623
PN 4
PG 6
WC Physics, Fluids & Plasmas
SC Physics
GA 581ON
UT WOS:000276533600024
ER
PT J
AU Brislawn, CM
AF Brislawn, Christopher M.
TI Group Lifting Structures for Multirate Filter Banks I: Uniqueness of
Lifting Factorizations
SO IEEE TRANSACTIONS ON SIGNAL PROCESSING
LA English
DT Article
DE Filter bank; group; lifting; linear phase filter; polyphase; unique
factorization; wavelet
ID PRODUCT GROUP-APPROACH; SYMMETRIC-EXTENSION; WAVELET TRANSFORMS;
CONSTRUCTION; SCHEME; DESIGN; SIGNAL; BASES
AB Group lifting structures are introduced to provide an algebraic framework for studying lifting factorizations of two-channel perfect reconstruction finite-impulse-response (FIR) filter banks. The lifting factorizations generated by a group lifting structure are characterized by Abelian groups of lower and upper triangular lifting matrices, an Abelian group of unimodular gain scaling matrices, and a set of base filter banks. Examples of group lifting structures are given for linear phase lifting factorizations of the two nontrivial classes of two-channel linear phase FIR filter banks, the whole-and half-sample symmetric classes, including both the reversible and irreversible cases. This covers the lifting specifications for whole-sample symmetric filter banks in Parts 1 and 2 of the ISO/IEC JPEG 2000 still image coding standard. The theory is used to address the uniqueness of lifting factorizations. With no constraints on the lifting process, it is shown that lifting factorizations are highly nonunique. When certain hypotheses developed in the paper are satisfied, however, lifting factorizations generated by a group lifting structure are shown to be unique. A companion paper applies the uniqueness results proven in this paper to the linear phase group lifting structures for whole-and half-sample symmetric filter banks.
C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Brislawn, CM (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM brislawn@lanl.gov
RI Zhang, Wenjun/G-2958-2011
FU Los Alamos Laboratory-Directed Research & Development Program; U. S.
Department of Energy [DE-AC52-06NA25396]
FX This work was supported by the Los Alamos Laboratory-Directed Research &
Development Program. Los Alamos National Laboratory is operated by Los
Alamos National Security LLC for the U. S. Department of Energy under
Contract DE-AC52-06NA25396.
NR 33
TC 3
Z9 3
U1 1
U2 4
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1053-587X
J9 IEEE T SIGNAL PROCES
JI IEEE Trans. Signal Process.
PD APR
PY 2010
VL 58
IS 4
BP 2068
EP 2077
DI 10.1109/TSP.2009.2039816
PG 10
WC Engineering, Electrical & Electronic
SC Engineering
GA 566LD
UT WOS:000275370800011
ER
PT J
AU Brislawn, CM
AF Brislawn, Christopher M.
TI Group Lifting Structures for Multirate Filter Banks II: Linear Phase
Filter Banks
SO IEEE TRANSACTIONS ON SIGNAL PROCESSING
LA English
DT Article
DE Filter bank; group; lifting; linear phase filter; polyphase; unique
factorization; wavelet
AB The theory of group lifting structures is applied to linear phase lifting factorizations for the two nontrivial classes of two-channel linear phase perfect reconstruction filter banks, the whole- and half-sample symmetric classes. Group lifting structures defined for the reversible and irreversible classes of whole- and half-sample symmetric filter banks are shown to satisfy the hypotheses of the uniqueness theorem for group lifting structures. It follows that linear phase group lifting factorizations of whole- and half-sample symmetric filter banks are therefore independent of the factorization methods used to construct them. These results cover the specification of whole- sample symmetric filter banks in the ISO/IEC JPEG 2000 image coding standard.
C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Brislawn, CM (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM brislawn@lanl.gov
RI Zhang, Wenjun/G-2958-2011
FU Los Alamos Laboratory-Directed Research & Development Program; U. S.
Department of Energy [DE-AC52-06NA25396]
FX This work was supported by the Los Alamos Laboratory-Directed Research &
Development Program. Los Alamos National Laboratory is operated by Los
Alamos National Security LLC for the U. S. Department of Energy under
Contract DE-AC52-06NA25396.
NR 10
TC 2
Z9 2
U1 0
U2 1
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1053-587X
J9 IEEE T SIGNAL PROCES
JI IEEE Trans. Signal Process.
PD APR
PY 2010
VL 58
IS 4
BP 2078
EP 2087
DI 10.1109/TSP.2009.2039818
PG 10
WC Engineering, Electrical & Electronic
SC Engineering
GA 566LD
UT WOS:000275370800012
ER
PT J
AU Still, KR
Gardner, DE
Snyder, R
Anderson, TJ
Honeyman, JO
Timchalk, C
AF Still, Kenneth R.
Gardner, Donald E.
Snyder, Robert
Anderson, Thomas J.
Honeyman, James O.
Timchalk, Charles
TI Development of occupational exposure limits for the Hanford tank farms
SO INHALATION TOXICOLOGY
LA English
DT Article
AB Production of plutonium for the United States' nuclear weapons program from the 1940s to the 1980s generated 53 million gallons of radioactive chemical waste, which is stored in 177 underground tanks at the Hanford site in southeastern Washington State. Recent attempts to begin the retrieval and treatment of these wastes require moving the waste to more modern tanks and result in potential exposure of the workers to unfamiliar odors emanating from headspace in the tanks. Given the unknown risks involved, workers were placed on supplied air respiratory protection. CH2MHILL, the managers of the Hanford site tank farms, asked an Independent Toxicology Panel (ITP) to assist them in issues relating to an industrial hygiene and risk assessment problem. The ITP was called upon to help determine the risk of exposure to vapors from the tanks, and in general develop a strategy for solution of the problem. This paper presents the methods used to determine the chemicals of potential concern (COPCs) and the resultant development of screening values and Acceptable Occupational Exposure Limits (AOELs) for these COPCs. A total of 1826 chemicals were inventoried and evaluated. Over 1500 chemicals were identified in the waste tanks headspaces and more than 600 of these were assigned screening values; 72 of these compounds were recommended for AOEL development. Included in this list of 72 were 57 COPCs identified by the ITP and of these 47 were subsequently assigned AOELs. An exhaustive exposure assessment strategy was developed by the CH2MHILL industrial hygiene department to evaluate these COPCs. 1 s(-1) G '' increases faster than G', yet not in any proportion to the omega.
C1 [Cao, Yutong; Liu, Zhaofeng; Gao, Xianghua; Yu, Junrong; Hu, Zuming] Donghua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.
[Liang, Ziqi] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Cao, YT (reprint author), Donghua Univ, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China.
EM caoyt@hotmail.com; lzf@dhu.edu.cn
RI Liang, Ziqi/G-9312-2011
FU Industrial Technology Development Foundation of National Development and
Reform Commission of China
FX We are grateful for valuable discussions with Zhusheng Zhou, Qingji Wu,
Xingsheng Zhu. This work was supported by Industrial Technology
Development Foundation of National Development and Reform Commission of
China.
NR 39
TC 1
Z9 1
U1 2
U2 15
PU MDPI AG
PI BASEL
PA POSTFACH, CH-4005 BASEL, SWITZERLAND
SN 1422-0067
J9 INT J MOL SCI
JI Int. J. Mol. Sci.
PD APR
PY 2010
VL 11
IS 4
BP 1352
EP 1364
DI 10.3390/ijms11041352
PG 13
WC Biochemistry & Molecular Biology; Chemistry, Multidisciplinary
SC Biochemistry & Molecular Biology; Chemistry
GA 589BP
UT WOS:000277119800009
PM 20480024
ER
PT J
AU Nixon, ME
Cazacu, O
Lebensohn, RA
AF Nixon, Michael E.
Cazacu, Oana
Lebensohn, Ricardo A.
TI Anisotropic response of high-purity alpha-titanium: Experimental
characterization and constitutive modeling
SO INTERNATIONAL JOURNAL OF PLASTICITY
LA English
DT Article
DE Twinning; alpha-Titanium; Tension-compression asymmetry; Orthotropic
elasto-plastic model; Finite element
ID MECHANICAL-BEHAVIOR; HEXAGONAL MATERIALS; PLASTIC ANISOTROPY; TEXTURE
EVOLUTION; YIELD CRITERION; STRAIN-RATE; DEFORMATION; TI-6AL-4V; ALLOY;
MAGNESIUM
AB This paper presents a comprehensive experimental and theoretical investigation of the deformation behavior of high-purity, polycrystalline alpha-titanium under quasi-static conditions at room temperature. The initial material in this study was a cross-rolled plate with a strong basal texture. To quantify the plastic anisotropy and the tension-compression asymmetry of this material, monotonic tensile and compressive tests were conducted, on samples cut along different directions of the plate. A new anisotropic elastic/plastic model was developed to describe the quasi-static macroscopic response of the aggregate. Key in its formulation is the use of an anisotropic yield criterion that captures strength-differential effects and an anisotropic hardening rule that accounts for texture evolution associated to twinning. A very good agreement between FE simulations using the model developed and uniaxial data was obtained. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Cazacu, Oana] Univ Florida, Dept Mech & Aerosp Engn, REEF, Shalimar, FL 32539 USA.
[Nixon, Michael E.] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
[Lebensohn, Ricardo A.] Los Alamos Natl Lab, MST Div, Los Alamos, NM 87545 USA.
RP Cazacu, O (reprint author), Univ Florida, Dept Mech & Aerosp Engn, REEF, 1350 N Posquito Rd, Shalimar, FL 32539 USA.
EM nixon@eglin.af.mil; cazacu@reef.ufl.edu; lebenso@lanl.gov
RI Lebensohn, Ricardo/A-2494-2008; Cazacu, Oana/L-4635-2016
OI Lebensohn, Ricardo/0000-0002-3152-9105; Cazacu, Oana/0000-0002-2499-9096
FU US Air Force [FA 8651-05-1-0005]
FX The texture measurements reported in this paper were conducted at Los
Alamos Neutron Science Center (LANSCE) by Dr. Sven Vogel, whose help and
input are gratefully acknowledged. O. Cazacu gratefully acknowledges the
partial support for this work provided by US Air Force, Grant FA
8651-05-1-0005.
NR 36
TC 83
Z9 85
U1 2
U2 44
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0749-6419
J9 INT J PLASTICITY
JI Int. J. Plast.
PD APR
PY 2010
VL 26
IS 4
BP 516
EP 532
DI 10.1016/j.ijplas.2009.08.007
PG 17
WC Engineering, Mechanical; Materials Science, Multidisciplinary; Mechanics
SC Engineering; Materials Science; Mechanics
GA 578BK
UT WOS:000276268200004
ER
PT J
AU Mathias, SA
Tsang, CF
van Reeuwijk, M
AF Mathias, Simon A.
Tsang, Chin-Fu
van Reeuwijk, Maarten
TI Investigation of hydromechanical processes during cyclic extraction
recovery testing of a deformable rock fracture
SO INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
LA English
DT Article
ID INJECTION; BEHAVIOR; SYSTEMS; FIELD
C1 [Mathias, Simon A.] Univ Durham, Dept Earth Sci, Durham, England.
[Tsang, Chin-Fu] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA.
[Tsang, Chin-Fu] Univ London Imperial Coll Sci Technol & Med, Dept Earth Sci & Engn, London, England.
[van Reeuwijk, Maarten] Univ London Imperial Coll Sci Technol & Med, Dept Civil & Environm Engn, London, England.
RP Mathias, SA (reprint author), Univ Durham, Dept Earth Sci, Durham, England.
EM s.a.mathias@durham.ac.uk
RI Mathias, Simon/B-6038-2008; van Reeuwijk, Maarten/C-2708-2008;
OI Mathias, Simon/0000-0003-3054-9056; van Reeuwijk,
Maarten/0000-0003-4840-5050
FU WorleyParsons EcoNomicsTM
FX This project was funded by the WorleyParsons EcoNomicsTM initiative.
NR 23
TC 4
Z9 4
U1 0
U2 9
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1365-1609
J9 INT J ROCK MECH MIN
JI Int. J. Rock Mech. Min. Sci.
PD APR
PY 2010
VL 47
IS 3
BP 517
EP 522
DI 10.1016/j.ijrmms.2009.12.008
PG 6
WC Engineering, Geological; Mining & Mineral Processing
SC Engineering; Mining & Mineral Processing
GA 571VL
UT WOS:000275783900018
ER
PT J
AU Wang, M
Wang, JK
Li, ZX
AF Wang, M.
Wang, J. K.
Li, Z. X.
TI A lattice Boltzmann algorithm for fluid-solid conjugate heat transfer
(vol 46, pg 228, 2007)
SO INTERNATIONAL JOURNAL OF THERMAL SCIENCES
LA English
DT Correction
C1 [Wang, M.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Wang, M.] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA.
[Wang, J. K.; Li, Z. X.] Tsinghua Univ, Dept Engn Mech, Beijing 100084, Peoples R China.
RP Wang, M (reprint author), Los Alamos Natl Lab, MS T003, Los Alamos, NM 87545 USA.
EM moralwang@jhu.edu
NR 1
TC 1
Z9 1
U1 2
U2 13
PU ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
PI PARIS
PA 23 RUE LINOIS, 75724 PARIS, FRANCE
SN 1290-0729
J9 INT J THERM SCI
JI Int. J. Therm. Sci.
PD APR
PY 2010
VL 49
IS 4
BP 740
EP 740
DI 10.1016/j.ijthermalsci.2009.11.003
PG 1
WC Thermodynamics; Engineering, Mechanical
SC Thermodynamics; Engineering
GA 561JE
UT WOS:000274971400014
ER
PT J
AU Belnap, CP
Pan, C
VerBerkmoes, NC
Power, ME
Samatova, NF
Carver, RL
Hettich, RL
Banfield, JF
AF Belnap, Christopher P.
Pan, Chongle
VerBerkmoes, Nathan C.
Power, Mary E.
Samatova, Nagiza F.
Carver, Rudolf L.
Hettich, Robert L.
Banfield, Jillian F.
TI Cultivation and quantitative proteomic analyses of acidophilic microbial
communities
SO ISME JOURNAL
LA English
DT Article
DE proteomics; acid mine drainage; biofilm
ID ACID-MINE DRAINAGE; TARGETED OLIGONUCLEOTIDE PROBES; SP-NOV; SHOTGUN
PROTEOMICS; ESCHERICHIA-COLI; PROTEIN; MICROORGANISMS; IRON;
LEPTOSPIRILLUM; EXPRESSION
AB Acid mine drainage (AMD), an extreme environment characterized by low pH and high metal concentrations, can support dense acidophilic microbial biofilm communities that rely on chemoautotrophic production based on iron oxidation. Field determined production rates indicate that, despite the extreme conditions, these communities are sufficiently well adapted to their habitats to achieve primary production rates comparable to those of microbial communities occurring in some non-extreme environments. To enable laboratory studies of growth, production and ecology of AMD microbial communities, a culturing system was designed to reproduce natural biofilms, including organisms recalcitrant to cultivation. A comprehensive metabolic labeling-based quantitative proteomic analysis was used to verify that natural and laboratory communities were comparable at the functional level. Results confirmed that the composition and core metabolic activities of laboratory-grown communities were similar to a natural community, including the presence of active, low abundance bacteria and archaea that have not yet been isolated. However, laboratory growth rates were slow compared with natural communities, and this correlated with increased abundance of stress response proteins for the dominant bacteria in laboratory communities. Modification of cultivation conditions reduced the abundance of stress response proteins and increased laboratory community growth rates. The research presented here represents the first description of the application of a metabolic labeling-based quantitative proteomic analysis at the community level and resulted in a model microbial community system ideal for testing physiological and ecological hypotheses. The ISME Journal (2010) 4, 520-530; doi:10.1038/ismej.2009.139; published online 24 December 2009
C1 [Banfield, Jillian F.] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Dept Earth & Planetary Sci, Microbiol Grad Grp, Berkeley, CA 94720 USA.
[Belnap, Christopher P.; Banfield, Jillian F.] Univ Calif Berkeley, Dept Plant & Microbial Biol, Microbiol Grad Grp, Berkeley, CA 94720 USA.
[Pan, Chongle; VerBerkmoes, Nathan C.; Hettich, Robert L.] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN USA.
[Power, Mary E.] Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA.
[Samatova, Nagiza F.] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN USA.
[Carver, Rudolf L.] Iron Mt Superfund Facil, Redding, CA USA.
RP Banfield, JF (reprint author), Univ Calif Berkeley, Dept Environm Sci Policy & Management, Dept Earth & Planetary Sci, Microbiol Grad Grp, Berkeley, CA 94720 USA.
EM jbanfield@berkeley.edu
RI Hettich, Robert/N-1458-2016
OI Hettich, Robert/0000-0001-7708-786X
FU US Department of Energy Genomics; NSF; NASA Astrobiology Institute
FX Mr Ted Arman (President, Iron Mountain Mines) and Dr Richard Sugarek are
thanked for site access and other assistance. We also thank Mike Zach,
Andy Thompson and Becca Ryals for technical assistance. Vincent Denef
and Paul Wilmes are thanked for helpful discussions. This research was
supported by the US Department of Energy Genomics: GTL and ASCR
programs, the NSF Biocomplexity Program and the NASA Astrobiology
Institute.
NR 50
TC 36
Z9 36
U1 0
U2 21
PU NATURE PUBLISHING GROUP
PI NEW YORK
PA 75 VARICK ST, 9TH FLR, NEW YORK, NY 10013-1917 USA
SN 1751-7362
J9 ISME J
JI ISME J.
PD APR
PY 2010
VL 4
IS 4
BP 520
EP 530
DI 10.1038/ismej.2009.139
PG 11
WC Ecology; Microbiology
SC Environmental Sciences & Ecology; Microbiology
GA 572RS
UT WOS:000275851100007
PM 20033068
ER
PT J
AU Boyce, BL
Huang, JY
Miller, DC
Kennedy, MS
AF Boyce, B. L.
Huang, J. Y.
Miller, D. C.
Kennedy, M. S.
TI Deformation and failure of small-scale structures
SO JOM
LA English
DT Editorial Material
ID NANOWIRES
C1 [Boyce, B. L.; Huang, J. Y.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Kennedy, M. S.] Clemson Univ, Sch Mat Sci & Engn, Clemson, SC 29631 USA.
RP Boyce, BL (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
RI Huang, Jianyu/C-5183-2008; Boyce, Brad/H-5045-2012
OI Boyce, Brad/0000-0001-5994-1743
NR 7
TC 4
Z9 4
U1 1
U2 8
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD APR
PY 2010
VL 62
IS 4
BP 62
EP 63
DI 10.1007/s11837-010-0061-3
PG 2
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 584RL
UT WOS:000276770100011
ER
PT J
AU Lewis, ER
AF Lewis, Ernie R.
TI Comment on "Measurements of the temperature dependent diffusion
coefficient of nanoparticles in the range of 295-600 K at atmospheric
pressure" by VY Rudyak, SN Dubtsov, AM Baklanov
SO JOURNAL OF AEROSOL SCIENCE
LA English
DT Editorial Material
DE Diffusion coefficient temperature dependence; Nanoparticles; Ultra-fine
aerosol particles; CMD correlation
ID SLIP CORRECTION MEASUREMENTS; SPHERICAL-PARTICLES; MOBILITY; MOTION
AB In a recent paper in this journal, Rudyak, Dubtsov, and Baklanov (2009) presented results of measurements of the penetration of nanoparticles with diameters from 3.5 to 84 nm at temperatures from similar to 300 to 600 K through a set of wire screens, from which they inferred diffusion coefficients. They argued that the formulation typically used for C. the Cunningham correction that accounts for non-continuum effects on the diffusion of nanoparticles, is not valid for temperatures greater than similar to 300 K, and they proposed a modification of this formulation which depends on both temperature and particle size. It is shown here that this modification produces unphysical results in that it yields negative values of the momentum accommodation coefficient. A likely reason for their results is that they used a polydisperse size distribution, for which the main contribution to the measured penetration would be from particles at sizes far from those attributed to them. (C) 2010 Elsevier Ltd. All rights reserved.
C1 Brookhaven Natl Lab, Dept Environm Sci, Div Atmospher Sci, Upton, NY 11973 USA.
RP Lewis, ER (reprint author), Brookhaven Natl Lab, Dept Environm Sci, Div Atmospher Sci, Bldg 815E, Upton, NY 11973 USA.
EM elewis@bnl.gov
NR 11
TC 0
Z9 0
U1 0
U2 1
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0021-8502
J9 J AEROSOL SCI
JI J. Aerosol. Sci.
PD APR
PY 2010
VL 41
IS 4
BP 418
EP 425
DI 10.1016/j.jaerosci.2010.02.001
PG 8
WC Engineering, Chemical; Engineering, Mechanical; Environmental Sciences;
Meteorology & Atmospheric Sciences
SC Engineering; Environmental Sciences & Ecology; Meteorology & Atmospheric
Sciences
GA 590HH
UT WOS:000277215600009
ER
PT J
AU Chapman, KW
Chupas, PJ
Halder, GJ
Hriljac, JA
Kurtz, C
Greve, BK
Ruschman, CJ
Wilkinson, AP
AF Chapman, Karena W.
Chupas, Peter J.
Halder, Gregory J.
Hriljac, Joseph A.
Kurtz, Charles
Greve, Benjamin K.
Ruschman, Chad J.
Wilkinson, Angus P.
TI Optimizing high-pressure pair distribution function measurements in
diamond anvil cells
SO JOURNAL OF APPLIED CRYSTALLOGRAPHY
LA English
DT Article
ID REFRACTIVE LENSES; IN-SITU; BATIO3; RANGE; TEMPERATURE; DIFFRACTION;
MECHANISM; EQUATION; DETECTOR; STATE
AB Pair distribution function (PDF) methods have great potential for the study of diverse high-pressure phenomena. However, the measurement of high-quality, high-resolution X-ray PDF data (to Q(max) > 20 angstrom(-1)) remains a technical challenge. An optimized approach to measuring high-pressure total scattering data for samples contained within a diamond anvil cell (DAC) is presented here. This method takes into account the coupled influences of instrument parameters (photon energy, detector type and positioning, beam size/shape, focusing), pressure-cell parameters (target pressure range, DAC type, diamonds, pressure-transmitting media, backing plates, pressure calibration) and data reduction on the resulting PDF. The efficacy of our approach is demonstrated by the high-quality, high-pressure PDFs obtained for representative materials spanning strongly and weakly scattering systems, and crystalline and amorphous samples. These are the highest-resolution high-pressure PDFs reported to date and include those for alpha-alumina (to Q(max) = 20 angstrom(-1)), BaTiO(3) (to Q(max) = 30 angstrom(-1)) and pressure-amorphized zeolite (to Q(max) = 20 angstrom(-1)).
C1 [Chapman, Karena W.; Chupas, Peter J.; Kurtz, Charles] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA.
[Hriljac, Joseph A.] Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England.
[Halder, Gregory J.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Greve, Benjamin K.; Ruschman, Chad J.; Wilkinson, Angus P.] Georgia Inst Technol, Dept Chem & Biochem, Atlanta, GA 30332 USA.
RP Chapman, KW (reprint author), Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA.
EM chapmank@aps.anl.gov; chupas@anl.gov
RI Wilkinson, Angus/C-3408-2008; Kurtz, Chalres/G-1037-2011; Chapman,
Karena/G-5424-2012; Halder, Gregory/C-5357-2013
OI Wilkinson, Angus/0000-0003-2904-400X; Kurtz,
Chalres/0000-0003-2606-0864;
FU US Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-06CH11357]; NSF [EAR-0622171, DMR-0605671,
DMR-0905842]; DOE-Geosciences [DE-FG02-94ER14466]
FX Work performed at Argonne National Laboratory and use of the Advanced
Photon Source were supported by the US Department of Energy, Office of
Science, Office of Basic Energy Sciences, under contract No.
DE-AC02-06CH11357. Gasket preparation and ruby fluorescence measurements
used the GSECARS facility (Sector 13), Advanced Photon Source, Argonne
National Laboratory. GSECARS is supported by the NSF-Earth Sciences
(EAR-0622171) and DOE-Geosciences (DE-FG02-94ER14466). APW is grateful
for financial support from the NSF under grant Nos. DMR-0605671 and
DMR-0905842.
NR 39
TC 17
Z9 17
U1 1
U2 29
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0021-8898
J9 J APPL CRYSTALLOGR
JI J. Appl. Crystallogr.
PD APR
PY 2010
VL 43
BP 297
EP 307
DI 10.1107/S0021889810002050
PN 2
PG 11
WC Chemistry, Multidisciplinary; Crystallography
SC Chemistry; Crystallography
GA 567GN
UT WOS:000275432600013
ER
PT J
AU Brayshaw, SK
Knight, JW
Raithby, PR
Savarese, TL
Schiffers, S
Teat, SJ
Warren, JE
Warren, MR
AF Brayshaw, Simon K.
Knight, Jason W.
Raithby, Paul R.
Savarese, Teresa L.
Schiffers, Stefanie
Teat, Simon J.
Warren, John E.
Warren, Mark R.
TI Photocrystallography - design and methodology for the use of a
light-emitting diode device
SO JOURNAL OF APPLIED CRYSTALLOGRAPHY
LA English
DT Article
ID X-RAY-DIFFRACTION; SUPRAMOLECULAR SOLIDS; SINGLE-CRYSTAL; EXCITED-STATE;
CRYSTALLOGRAPHY; EXCITATION; COMPLEXES; ISOMER
AB With the increase in interest in photocrystallographic experiments, the use of light-emitting diodes (LEDs) provides an alternative, low-budget light source (by comparison to lasers) and allows photocrystallographic experiments to be carried out readily. Here the design of an LED array device suitable for use in single-crystal X-ray diffraction experiments is reported, and the experimental methodology used for determining the structures of metastable species is described.
C1 [Brayshaw, Simon K.; Raithby, Paul R.; Savarese, Teresa L.; Schiffers, Stefanie; Warren, John E.; Warren, Mark R.] Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England.
[Knight, Jason W.; Teat, Simon J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94721 USA.
[Warren, John E.] STFC Daresbury Lab, Warrington WA4 4AD, Cheshire, England.
RP Raithby, PR (reprint author), Univ Bath, Dept Chem, Bath BA2 7AY, Avon, England.
EM p.r.raithby@bath.ac.uk
RI Warren, John/B-5219-2008; Raithby, Paul/N-7997-2014
OI Warren, John/0000-0002-8755-7981; Raithby, Paul/0000-0002-2944-0662
FU EPSRC; STFC; Director, Office of Science, Office of Basic Energy
Sciences of the US Department of Energy [DE-AC02-05CH11231]; States of
Jersey
FX We are grateful to the EPSRC and STFC for funding and for the award of
beamtime. The Advanced Light Source is also acknowledged for granting
beamtime, which is supported by the Director, Office of Science, Office
of Basic Energy Sciences of the US Department of Energy under contract
No. DE-AC02-05CH11231. PRR is grateful to the EPSRC for the award of a
senior fellowship and SS and MRW for the award of studentships. TLS is
grateful to the States of Jersey for the award of a studentship.
NR 24
TC 17
Z9 17
U1 1
U2 11
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0021-8898
J9 J APPL CRYSTALLOGR
JI J. Appl. Crystallogr.
PD APR
PY 2010
VL 43
BP 337
EP 340
DI 10.1107/S0021889810004759
PN 2
PG 4
WC Chemistry, Multidisciplinary; Crystallography
SC Chemistry; Crystallography
GA 567GN
UT WOS:000275432600017
ER
PT J
AU Niu, SJ
Jia, XC
Sang, JR
Liu, XL
Lu, CS
Liu, YG
AF Niu, Shengjie
Jia, Xingcan
Sang, Jianren
Liu, Xiaoli
Lu, Chunsong
Liu, Yangang
TI Distributions of Raindrop Sizes and Fall Velocities in a Semiarid
Plateau Climate: Convective versus Stratiform Rains
SO JOURNAL OF APPLIED METEOROLOGY AND CLIMATOLOGY
LA English
DT Article
ID WALDVOGEL RAINFALL DISDROMETER; TERMINAL VELOCITIES; DROP SIZE;
PRECIPITATION; RADAR; SPECTRA; HYDROMETEORS; SIMULATIONS; CLOUDS; SCHEME
AB Joint size and fall velocity distributions of raindrops were measured with a Particle Size and Velocity (PARSIVEL) precipitation particle disdrometer in a field experiment conducted during July and August 2007 at a semiarid continental site located in Guyuan, Ningxia Province, China (36 degrees N, 106 degrees 16'E). Data from both stratiform and convective clouds are analyzed. Comparison of the observed raindrop size distributions shows that the increase of convective rain rates arises from the increases of both drop concentration and drop diameter while the increase of the rain rate in the stratiform clouds is mainly due to the increase of median and large drop concentration. Another striking contrast between the stratiform and convective rains is that the size distributions from the stratiform (convective) rains tend to narrow (broaden) with increasing rain rates. Statistical analysis of the distribution pattern shows that the observed size distributions from both rain types can be well described by the gamma distribution. Examination of the raindrop fall velocity reveals that the difference in air density leads to a systematic change in the drop fall velocity while organized air motions (updrafts and downdrafts), turbulence, drop breakup, and coalescence likely cause the large spread of drop fall velocity, along with additional systematic deviation from terminal velocity at certain raindrop diameters. Small (large) drops tend to have superterminal (subterminal) velocities statistically, with the positive deviation from the terminal velocity of small drops being much larger than the negative deviation of large drops.
C1 [Niu, Shengjie; Jia, Xingcan; Liu, Xiaoli; Lu, Chunsong] Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ, Sch Atmospher Phys, Nanjing, Peoples R China.
[Sang, Jianren] Ningxia Inst Meteorol Sci, Ningxia, Peoples R China.
[Liu, Yangang] Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Niu, SJ (reprint author), Nanjing Univ Informat Sci & Technol, Key Lab Meteorol Disaster, Minist Educ, Sch Atmospher Phys, Nanjing, Peoples R China.
EM niusj@nuist.edu.cn
RI Liu, Yangang/H-6154-2011; Lu, Chunsong/F-2645-2013; Lu,
Chunsong/K-7124-2013
OI Lu, Chunsong/0000-0002-8967-0371
FU Chinese National Science Foundation [40537034]; Ministry of Science and
Technology of China [2006BAC12B00-01-01-07]; U.S. Department of Energy
FX This study is mainly supported by the Chinese National Science
Foundation under Grant 40537034-"Observational Study on Rainfall
Physical Processes and Seeding Effect of Stratiform Cloud''-and by the
Ministry of Science and Technology of China under Grant
2006BAC12B00-01-01-07-"Critical Technology and Equipment Development in
Weather Modification.'' Author Y. Liu is supported by the ARM Program of
the U.S. Department of Energy. The authors thank Drs. Mitchell at DRI
and Heymsfield at NCAR for their stimulating suggestions. The authors
also thank their colleagues at the Laboratory for Atmospheric Physics
and Environment of the China Meteorological Administration and Ningxia
Institute of Meteorological Science for their support during the field
experiment.
NR 48
TC 29
Z9 33
U1 3
U2 18
PU AMER METEOROLOGICAL SOC
PI BOSTON
PA 45 BEACON ST, BOSTON, MA 02108-3693 USA
SN 1558-8424
EI 1558-8432
J9 J APPL METEOROL CLIM
JI J. Appl. Meteorol. Climatol.
PD APR
PY 2010
VL 49
IS 4
BP 632
EP 645
DI 10.1175/2009JAMC2208.1
PG 14
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 594KU
UT WOS:000277537400006
ER
PT J
AU Ahart, M
Mao, HK
Cohen, RE
Hemley, RJ
Samara, GA
Bing, YH
Ye, ZG
Kojima, S
AF Ahart, Muhtar
Mao, Ho-kwang
Cohen, R. E.
Hemley, Russell J.
Samara, George A.
Bing, Yonghong
Ye, Zuo-Guang
Kojima, Seiji
TI Pressure effects on relaxor ferroelectricity in disordered
Pb(Sc1/2Nb1/2)O-3
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID SINGLE-CRYSTALS; PHASE-TRANSITION; BRILLOUIN-SCATTERING; BEHAVIOR;
PEROVSKITES; CROSSOVER; ORDER; MODE
AB High-pressure Brillouin and Raman scattering spectroscopy and x-ray diffraction measurements were carried out on disordered Pb(Sc1/2Nb1/2)O-3, considered to be a model system for phase transitions in relaxor ferroelectrics and related materials. The observed pressure-dependent Raman spectra are unusual, with the relaxor state distinguished by broad Raman bands. Raman spectra as a function of pressure reveal a new peak at 370 cm(-1), with two peaks near 550 cm(-1) merge above 2-3 GPa, indicating a structural phase transition in this pressure range consistent with earlier dielectric measurements. A significant softening in the longitudinal acoustic mode is observed by Brillouin scattering. Both the temperature and pressure dependencies of the linewidth reveal that the longitudinal acoustic mode softening arises from electrostrictive coupling between polar nanoregions and acoustic modes. X-ray diffraction indicates that the pressure-volume compression curve changes near 2 GPa. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3369278]
C1 [Ahart, Muhtar; Mao, Ho-kwang; Cohen, R. E.; Hemley, Russell J.] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA.
[Samara, George A.] Sandia Natl Labs, Albuquerque, NM 87175 USA.
[Bing, Yonghong; Ye, Zuo-Guang] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada.
[Bing, Yonghong; Ye, Zuo-Guang] Simon Fraser Univ, LABS 4D, Burnaby, BC V5A 1S6, Canada.
[Kojima, Seiji] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan.
RP Ahart, M (reprint author), Carnegie Inst Washington, Geophys Lab, 5251 Broad Branch Rd NW, Washington, DC 20015 USA.
EM maihaiti@ciw.edu
RI Cohen, Ronald/B-3784-2010; Kojima, Seiji/L-9006-2016
OI Cohen, Ronald/0000-0001-5871-2359; Kojima, Seiji/0000-0003-1933-9269
FU Office of Naval Research [N00014-02-1-0506, N00014-06-10166,
N00014-07-1-0451]; Carnegie/DOE Alliance Center (CDAC)
[DE-FC03-03NA00144]; U.S. Department of Energy [DE-AC04-94AL85000];
MEXT, Japan [16204032]
FX We thank S. Gramsch and E. L. Venturini for useful discussions, and R.
Yang for help with x-ray diffraction experiments. This work was
sponsored by the Office of Naval Research under Grants N00014-02-1-0506,
N00014-06-10166, and N00014-07-1-0451 and the Carnegie/DOE Alliance
Center (CDAC) under Grant DE-FC03-03NA00144. The work at Sandia National
Laboratory was supported U.S. Department of Energy under Contract No.
DE-AC04-94AL85000. This research also was supported in part by the
Grant-in-Aid for Scientific Research (A), 2005, Grant No. 16204032, and
by the 21st Century COE program under MEXT, Japan.
NR 36
TC 10
Z9 10
U1 1
U2 13
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD APR 1
PY 2010
VL 107
IS 7
AR 074110
DI 10.1063/1.3369278
PG 5
WC Physics, Applied
SC Physics
GA 585AA
UT WOS:000276795400069
ER
PT J
AU Cheng, J
Chen, S
Vianco, PT
Li, JCM
AF Cheng, Jing
Chen, Samuel
Vianco, Paul T.
Li, James C. M.
TI Quantitative analysis for hillocks grown from electroplated Sn film
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID SPONTANEOUS WHISKER GROWTH; THIN TIN FILMS; IMPRESSION CREEP;
ELECTROMIGRATION; DIFFUSION; TRACER; CU
AB Tin (Sn) films of 1 mu m thick and 2-3 mu m grain size were electroplated over a silicon (Si) wafer. The wafer was first deposited with an adhesion layer of chromium (Cr) followed by a nickel (Ni) using the evaporation technique. A special fixture was used to apply a biaxial compressive stress to the Sn film. After exposing the sample to 160 degrees C under vacuum for seven days, large hillocks were observed having dimensions of 10-30 mu m in diameter and 30-150 mu m in length. The hillock density was approximately seven per square mm. A quantitative method was developed using surface mapping and MATLAB (TM) to estimate the volume of hillocks per unit area of the Sn film and thus, to relate that volume to the local compressive stress. The rate of growth was modeled as a flow of Sn atoms along the Sn/Ni interface under the applied pressure gradient. Reasonable viscosity and self-diffusivity were calculated, which suggested that Sn/Ni interface diffusion was potentially the mechanism for hillock growth. (C) 2010 American Institute of Physics. [doi:10.1063/1.3359658]
C1 [Cheng, Jing; Li, James C. M.] Univ Rochester, Mat Sci Program, Rochester, NY 14627 USA.
[Chen, Samuel] Eastman Kodak Co, Rochester, NY 14559 USA.
[Vianco, Paul T.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Cheng, J (reprint author), Univ Rochester, Mat Sci Program, 601 Elmwood Ave, Rochester, NY 14627 USA.
EM jicheng@me.rochester.edu
FU Sandia National Laboratory [DE-AC04-94AL85000]
FX This research was supported by Sandia National Laboratory through the
efforts of Dr. Paul T. Vianco under Contract No. DE-AC04-94AL85000. We
acknowledge with thanks the Eastman Kodak Co. for the use of FIB
facility through Dr. Samuel Chen. We also appreciate Steven Stoker of
EKC for assistance and careful preparation of the TEM samples.
NR 27
TC 8
Z9 8
U1 1
U2 13
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD APR 1
PY 2010
VL 107
IS 7
AR 074902
DI 10.1063/1.3359658
PG 4
WC Physics, Applied
SC Physics
GA 585AA
UT WOS:000276795400093
ER
PT J
AU Franco, A
Zapf, VS
Barbeta, VB
Jardim, RF
AF Franco, A., Jr.
Zapf, V. S.
Barbeta, V. B.
Jardim, R. F.
TI Spin-wave fluctuations in ferrimagnetic MgxFe3-xO4 nanoparticles
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID MAGNETIC-PROPERTIES; CURIE-TEMPERATURE; MAGNESIUM FERRITE; PARTICLES;
NICKEL; FERROFLUID; DEPENDENCE; MOSSBAUER; PRESSURE; CLUSTERS
AB We have performed a systematic study of the magnetic properties of a series of ferrimagnetic nanoparticles of MgxFe3-xO4 (0.8 <= x <= 1.5) prepared by the combustion reaction method. The magnetization data can be well fitted by Bloch's law with T-3/2. Bloch's constant B determined from the fitting procedure was found to increase with Mg content x from similar to 3.09 X 10(-5) K-3/2 for x = 0.8 to 6.27 X 10(-5) K-3/2 for x=1.5. The exchange integral J(AB) and the spin-wave stiffness constant D of MgxFe3-xO4 nanoparticles were also determined as similar to 0.842 and 0.574 meV and 296 and 202 meV angstrom(2) for specimens with x=0.8 and 1.5, respectively. These results are discussed in terms of cation redistribution among A and B sites on these nanostructured spinel ferrites. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3359709]
C1 [Franco, A., Jr.] Univ Fed Goias, Inst Fis, BR-74001970 Goiania, Go, Brazil.
[Zapf, V. S.] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA.
[Barbeta, V. B.] Ctr Univ FEI, Dept Fis, BR-09850901 Sao Paulo, Brazil.
[Jardim, R. F.] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil.
RP Franco, A (reprint author), Univ Fed Goias, Inst Fis, CP 131, BR-74001970 Goiania, Go, Brazil.
EM franco@if.ufg.br
RI Barbeta, Vagner/F-2488-2010; Zapf, Vivien/K-5645-2013; Nanotecnologias,
Inct/I-2407-2013; Jardim, Renato/J-8068-2014; Franco Jr,
Adolfo/L-3515-2014
OI Barbeta, Vagner/0000-0001-8023-7080; Zapf, Vivien/0000-0002-8375-4515;
Jardim, Renato/0000-0002-2000-0257; Franco Jr,
Adolfo/0000-0001-6428-6640
FU FUNAPE-UFG; CNPq [308706/2007-2]; NSF; DOE; State of Florida; FAPESP
FX We are grateful for the financial support provided by the Brazilian
agencies FUNAPE-UFG and CNPq. Work at the National High Magnetic Field
Laboratory at Los Alamos National Laboratory was supported by NSF, the
DOE, and the State of Florida. Work at the Universidade de Sao Paulo was
supported by the Brazilian agencies FAPESP and CNPq. One of us (R.F.J.)
is a CNPq fellow under Grant No. 308706/2007-2.
NR 36
TC 9
Z9 9
U1 1
U2 11
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD APR 1
PY 2010
VL 107
IS 7
AR 073904
DI 10.1063/1.3359709
PG 5
WC Physics, Applied
SC Physics
GA 585AA
UT WOS:000276795400047
ER
PT J
AU Mendelev, MI
Kramer, MJ
AF Mendelev, M. I.
Kramer, M. J.
TI Reliability of methods of computer simulation of structure of amorphous
alloys
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID REVERSE MONTE-CARLO; INTERATOMIC POTENTIALS; MOLECULAR-DYNAMICS; LIQUID;
SOLIDS; RMC; CU
AB We took a model created by the molecular dynamics (MD) simulation with a semiempirical potential as a target system and explored how its amorphous structure and a few other properties depend on the simulation method. We found that if the cooling rate is too high, 10(13)-10(14) K/s, the system has no time to adjust its structure to the change in temperature/density. Since this cooling corresponds to a typical ab initio MD simulation, this brings into doubt that an equilibrium glass structure can be obtained using ab initio MD simulation. We also used the target partial pair correlation functions (PPCFs) to explore a possibility to create the atomic models from diffraction data alone. We were able to create models with the PPCFs, which nearly coincided with the target ones. Nevertheless, we found that the potential energy of the quenched states and the distribution of the Voronoi polyhedra in the models created from PPCFs were different than the target quantities. This study shows that reverse Monte Carlo technique used to analyze the diffraction data can result in a considerably more disordered structure than the target structure. c 2010 American Institute of Physics. [doi: 10.1063/1.3359710]
C1 [Mendelev, M. I.; Kramer, M. J.] Ames Lab, Ames, IA 50011 USA.
RP Mendelev, MI (reprint author), Ames Lab, Ames, IA 50011 USA.
EM mendelev@ameslab.gov
FU Department of Energy, Office of Basic Energy Sciences
[DE-AC02-07CH11358]
FX Work at the Ames Laboratory was supported by the Department of Energy,
Office of Basic Energy Sciences, under Contract No. DE-AC02-07CH11358.
NR 28
TC 7
Z9 7
U1 0
U2 14
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD APR 1
PY 2010
VL 107
IS 7
AR 073505
DI 10.1063/1.3359710
PG 8
WC Physics, Applied
SC Physics
GA 585AA
UT WOS:000276795400019
ER
PT J
AU Sundaram, VM
Soni, A
Russo, RE
Wen, SB
AF Sundaram, Vijay M.
Soni, Alok
Russo, Richard E.
Wen, Sy-Bor
TI Analysis of nanopatterning through near field effects with femtosecond
and nanosecond lasers on semiconducting and metallic targets
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID OPTICAL MICROSCOPY; DIFFRACTION LIMIT; SPECTROSCOPY; MOLECULES; PROBES;
SCALE
AB A systematic study was conducted to understand the size and shape of nanopatterns generated on selected semiconducting (Si and Ge) and metallic (Cr, Cu, and Ag) targets under different laser pulse durations, laser energies, and number of laser pulses. Based on the experimental results, femtosecond laser pulses, compared with nanosecond laser pulses, provide lower damage thresholds to the targets but higher damage thresholds to the near field scanning optical microscope (NSOM) probes at the wavelength (similar to 400-410 nm) studied. Furthermore, the resulting nanopatterns showed a significant dependence on the optical properties (i.e., absorption coefficient and surface reflectivity) of the target material. By comparing the obtained experimental results, we conclude that the optical energy transport from the NSOM probe to the target dominates the pattern generation when femtosecond laser is applied to the NSOM system. When nanosecond laser is applied, both the thermal and optical energy transported from the NSOM probe to the targets attribute to the obtained morphology of nanopatterns on different targets under the experimental conditions studied. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3366713]
C1 [Sundaram, Vijay M.; Soni, Alok; Wen, Sy-Bor] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA.
[Russo, Richard E.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Wen, SB (reprint author), Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA.
EM syborwen@tamu.edu
FU National Science Foundation [CBET 0845794]; Texas Engineering Experiment
Station (TEES) and Texas AM University
FX This work is supported by National Science Foundation (Grant No. CBET
0845794) and the startup fund provided by the Texas Engineering
Experiment Station (TEES) and Texas A&M University. The authors are also
pleased to acknowledge helpful discussions and support from Xianglei Mao
and Vasileia Zormpa at LBNL; Ralph Greif at UC Berkeley; Dave Diercks at
University of North Texas.
NR 30
TC 4
Z9 4
U1 1
U2 6
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD APR 1
PY 2010
VL 107
IS 7
AR 074305
DI 10.1063/1.3366713
PG 10
WC Physics, Applied
SC Physics
GA 585AA
UT WOS:000276795400074
ER
PT J
AU Sani, RK
Rastogi, G
Moberly, JG
Dohnalkova, A
Ginn, TR
Spycher, N
Shende, RV
Peyton, BM
AF Sani, Rajesh K.
Rastogi, Gurdeep
Moberly, James G.
Dohnalkova, Alice
Ginn, Timothy R.
Spycher, Nicolas
Shende, Rajesh V.
Peyton, Brent M.
TI The toxicity of lead to Desulfovibrio desulfuricans G20 in the presence
of goethite and quartz
SO JOURNAL OF BASIC MICROBIOLOGY
LA English
DT Article
DE Heavy metals; Iron minerals; Sulfate-reducing bacteria; Pb-toxicity
ID SULFATE-REDUCING BACTERIA; HEAVY-METALS; IRON SULFIDES; REDUCTION;
COPPER; SUBSURFACE; RESISTANCE; SURFACES; HEMATITE; URANIUM
AB An aqueous mixture of goethite, quartz, and lead chloride (PbCl(2)) was treated with the sulfate-reducing bacterium, Desulfovibrio desulfuricans G20 (D. desulfuricans G20), in a medium specifically designed to assess metal toxicity. In the presence of 26 mu M of soluble Pb, together with the goethite and quartz, D. desulfuricans G20 grew after a lag time of 5 days compared to 2 days in Pb-, goethite-, and quartz-free treatments. In the absence of goethite and quartz, however, with 26 mu M soluble Pb, no measurable growth was observed. Results showed that D. desulfuricans G20 first removed Pb from solutions then growth began resulting in black precipitates of Pb and iron sulfides. Transmission electron microscopic analyses of thin sections of D. desulfuricans G20 treated with 10 mu M PbCl(2) in goethite- and quartz-free treatment showed the presence of a dense deposit of lead sulfide precipitates both in the periplasm and cytoplasm. However, thin sections of D. desulfuricans G20 treated with goethite, quartz, and PbCl(2) (26 mu M soluble Pb) showed the presence of a dense deposit of iron sulfide precipitates both in the periplasm and cytoplasm. Energy-dispersive X-ray spectroscopy, selected area electron diffraction patterns, or X-ray diffraction analyses confirmed the structure of precipitated Pb inside the cell as galena (PbS) in goethite- and quartz-free treatments, and iron sulfides in treatments with goethite, quartz, and PbCl(2). Overall results suggest that even at the same soluble Pb concentration (26 mu M), in the presence of goethite and quartz, apparent Pb toxicity to D. desulfuricans G20 decreased significantly. Further, accumulation of lead/iron sulfides inside D. desulfuricans G20 cells depended on the presence of goethite and quartz.
C1 [Sani, Rajesh K.; Rastogi, Gurdeep; Shende, Rajesh V.] S Dakota Sch Mines & Technol, Dept Biol & Chem Engn, Rapid City, SD 57701 USA.
[Moberly, James G.; Peyton, Brent M.] Montana State Univ, Dept Biol & Chem Engn, Bozeman, MT 59717 USA.
[Dohnalkova, Alice] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA.
[Ginn, Timothy R.] Univ Calif Davis, Dept Civil & Environm Engn, Davis, CA 95616 USA.
[Spycher, Nicolas] Lawrence Berkeley Lab, Div Earth Sci, Dept Geochem, Berkeley, CA USA.
RP Sani, RK (reprint author), S Dakota Sch Mines & Technol, Dept Biol & Chem Engn, Rapid City, SD 57701 USA.
EM Rajesh.Sani@sdsmt.edu
RI Spycher, Nicolas/E-6899-2010; Peyton, Brent/G-5247-2015;
OI Peyton, Brent/0000-0003-0033-0651; Moberly, James/0000-0003-0950-0952
FU Natural and Accelerated Bioremediation Research program; Office of
Biological and Environmental Research, U.S. Department of Energy
[DE-FG03-98ER62630/A001, DE-FG03-01ER63270, DE-FG02-07-ER-64366];
National Science Foundation [0628258]; South Dakota Governors 2010 seed
grant program
FX The authors gratefully acknowledge the financial support provided by the
Natural and Accelerated Bioremediation Research program (now known as
Environmental Remediation Science Program, Office of Biological and
Environmental Research, U.S. Department of Energy (Grants
#DE-FG03-98ER62630/A001, #DE-FG03-01ER63270, and #DE-FG02-07-ER-64366)
and National Science Foundation Grant No. 0628258. In addition, Rajesh
Sani acknowledges funding through the South Dakota Governors 2010 seed
grant program. The HR-TEM imaging and analyses were performed at the W.
R. Wiley Environmental Molecular Sciences Laboratory (EMSL), a national
scientific user facility operated by Battelle for the U.S. DOE, located
at the Pacific Northwest National Laboratory in Richland, WA. We also
thank the anonymous reviewers whose critiques were instrumental in
improving the quality of our manuscript.
NR 33
TC 6
Z9 6
U1 0
U2 8
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY
SN 0233-111X
J9 J BASIC MICROB
JI J. Basic Microbiol.
PD APR
PY 2010
VL 50
IS 2
BP 160
EP 170
DI 10.1002/jobm.200900239
PG 11
WC Microbiology
SC Microbiology
GA 590FO
UT WOS:000277210300006
PM 20082378
ER
PT J
AU Xu, YQ
McArthur, DL
Alger, JR
Etchepare, M
Hovda, DA
Glenn, TC
Huang, SC
Dinov, I
Vespa, PM
AF Xu, Yueqiao
McArthur, David L.
Alger, Jeffry R.
Etchepare, Maria
Hovda, David A.
Glenn, Thomas C.
Huang, Sungcheng
Dinov, Ivo
Vespa, Paul M.
TI Early nonischemic oxidative metabolic dysfunction leads to chronic brain
atrophy in traumatic brain injury
SO JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
LA English
DT Article
DE atrophy; metabolism; MRI; positron emission tomography; traumatic brain
injury
ID IRREVERSIBLE TISSUE-DAMAGE; ISCHEMIC-INJURY; HEAD-INJURY; CHILDREN;
MODERATE; CRISIS; MRI; MICRODIALYSIS; VOLUME; SCALE
AB Chronic brain atrophy after traumatic brain injury (TBI) is a well-known phenomenon, the causes of which are unknown. Early nonischemic reduction in oxidative metabolism is regionally associated with chronic brain atrophy after TBI. A total of 32 patients with moderate-to-severe TBI prospectively underwent positron emission tomography (PET) and volumetric magnetic resonance imaging (MRI) within the first week and at 6 months after injury. Regional lobar assessments comprised oxidative metabolism and glucose metabolism. Acute MRI showed a preponderance of hemorrhagic lesions with few irreversible ischemic lesions. Global and regional chronic brain atrophy occurred in all patients by 6 months, with the temporal and frontal lobes exhibiting the most atrophy compared with the occipital lobe. Global and regional reduction in cerebral metabolic rate of oxygen (CMRO(2)), cerebral blood flow (CBF), oxygen extraction fraction (OEF), and cerebral metabolic rate of glucose were observed. The extent of metabolic dysfunction was correlated with the total hemorrhage burden on initial MRI (r = 0.62, P = 0.01). The extent of regional brain atrophy correlated best with CMRO2 and CBF. Lobar values of OEF were not in the ischemic range and did not correlate with chronic brain atrophy. Chronic brain atrophy is regionally specific and associated with regional reductions in oxidative brain metabolism in the absence of irreversible ischemia. Journal of Cerebral Blood Flow & Metabolism (2010) 30, 883-894; doi:10.1038/jcbfm.2009.263; published online 23 December 2009
C1 [Vespa, Paul M.] Univ Calif Los Angeles, Dept Neurosurg, David Geffen Sch Med, Ronald Reagan UCLA Med Ctr, Los Angeles, CA 90095 USA.
[Alger, Jeffry R.; Vespa, Paul M.] Univ Calif Los Angeles, Dept Neurol, David Geffen Sch Med, Los Angeles, CA 90095 USA.
[Huang, Sungcheng] Univ Calif Los Angeles, Dept Mol & Med Pharmacol, David Geffen Sch Med, Los Angeles, CA 90095 USA.
[Huang, Sungcheng] Univ Calif Los Angeles, DOE Ctr Mol Med, David Geffen Sch Med, Los Angeles, CA 90095 USA.
[Xu, Yueqiao] Capital Med Univ, Dept Neurosurg, Xuanwu Hosp, Beijing, Peoples R China.
RP Vespa, PM (reprint author), Univ Calif Los Angeles, Dept Neurosurg, David Geffen Sch Med, Ronald Reagan UCLA Med Ctr, 757 Westwood Blvd,Room RR 6236A, Los Angeles, CA 90095 USA.
EM PVespa@mednet.ucla.edu
RI McArthur, David/E-6442-2013;
OI McArthur, David/0000-0003-3385-1314; Dinov, Ivo/0000-0003-3825-4375
FU California State Neurotrauma Initiative; [NS049471]; [NS02089]
FX The research was supported by Grant nos NS049471, NS02089, and the
California State Neurotrauma Initiative.
NR 36
TC 42
Z9 42
U1 0
U2 5
PU NATURE PUBLISHING GROUP
PI NEW YORK
PA 75 VARICK ST, 9TH FLR, NEW YORK, NY 10013-1917 USA
SN 0271-678X
J9 J CEREBR BLOOD F MET
JI J. Cereb. Blood Flow Metab.
PD APR
PY 2010
VL 30
IS 4
BP 883
EP 894
DI 10.1038/jcbfm.2009.263
PG 12
WC Endocrinology & Metabolism; Hematology; Neurosciences
SC Endocrinology & Metabolism; Hematology; Neurosciences & Neurology
GA 577BZ
UT WOS:000276197200023
PM 20029449
ER
PT J
AU Theisen, K
Smit, B
Haranczyk, M
AF Theisen, Kevin
Smit, Berend
Haranczyk, Maciej
TI Chemical Hieroglyphs: Abstract Depiction of Complex Void Space Topology
of Nanoporous Materials
SO JOURNAL OF CHEMICAL INFORMATION AND MODELING
LA English
DT Article
ID METAL-ORGANIC FRAMEWORKS; MOLECULAR SIMULATIONS; SHAPE SELECTIVITY;
CARBON-DIOXIDE; RIBBON MODELS; ZEOLITES; ADSORPTION; SEPARATION;
DIFFUSION; MIXTURES
AB In general, most porous materials are so complex that structural information cannot be easily observed with 3D visualization tools. To address this problem, we have developed a special abstract 2D representation to depict all important topological features and geometrical parameters. Our approach involves reducing these structures based on symmetry and perceived building blocks to a compressed, graph representation that allows for quick structure analysis, classification, and comparison.
C1 [Haranczyk, Maciej] Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA 94720 USA.
[Theisen, Kevin; Smit, Berend] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Smit, Berend] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA.
RP Haranczyk, M (reprint author), Lawrence Berkeley Natl Lab, Computat Res Div, 1 Cyclotron Rd,Mail Stop 50F-1650, Berkeley, CA 94720 USA.
EM mharanczyk@lbl.gov
RI Smit, Berend/B-7580-2009; EFRC, CGS/I-6680-2012; Haranczyk,
Maciej/A-6380-2014; Stangl, Kristin/D-1502-2015
OI Smit, Berend/0000-0003-4653-8562; Haranczyk, Maciej/0000-0001-7146-9568;
FU U.S. Department of Energy [DE-ACO2-05CH11231]; DOE Office of Basic
Energy Sciences; Office of Advanced Scientific Computing Research
[CSNEW918]; U.S. Department of Energy, Office of Science, Office of
Basic Energy Sciences [DE-SC0001015]
FX We would like to thank Prof. Vladislav Blatov and Prof. Davide Proserpio
for provision of the zeolite structures contained in IZA database in a
format suitable for the TOPOS package as well as their invaluable help
regarding its use. M.H. is a 2008 Seaborg Fellow at Lawrence Berkeley
National Laboratory. This research was supported in part (to M.H.) by
the U.S. Department of Energy under contract DE-ACO2-05CH11231. This
work was also supported in part (to M.H.) jointly by DOE Office of Basic
Energy Sciences and the Office of Advanced Scientific Computing Research
through SciDAC project #CSNEW918 entitled "Knowledge guided screening
tools for identification of porous materials for CO2
separations". K.T. and B.S. were supported as part of the Center for Gas
Separations Relevant to Clean Energy Technologies, an Energy Frontier
Research Center funded by the U.S. Department of Energy, Office of
Science, Office of Basic Energy Sciences under Award Number
DE-SC0001015.
NR 30
TC 8
Z9 8
U1 0
U2 4
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1549-9596
J9 J CHEM INF MODEL
JI J. Chem Inf. Model.
PD APR
PY 2010
VL 50
IS 4
BP 461
EP 469
DI 10.1021/ci900451v
PG 9
WC Chemistry, Medicinal; Chemistry, Multidisciplinary; Computer Science,
Information Systems; Computer Science, Interdisciplinary Applications
SC Pharmacology & Pharmacy; Chemistry; Computer Science
GA 586MX
UT WOS:000276915200001
PM 20218697
ER
PT J
AU Chu, YZ
Xu, Q
Guo, H
AF Chu, Yuzhuo
Xu, Qin
Guo, Hong
TI Understanding Energetic Origins of Product Specificity of SET8 from
QM/MM Free Energy Simulations: What Causes the Stop of Methyl Addition
during Histone Lysine Methylation?
SO JOURNAL OF CHEMICAL THEORY AND COMPUTATION
LA English
DT Article
ID METHYLTRANSFERASE SET7/9; CATALYTIC MECHANISM; DYNAMICS; CHROMATIN;
INSIGHTS
AB Biological consequences of histone lysine methylation depend on the methylation states of the lysine residues on the tails of histone proteins that are methylated by protein lysine methyltransferases (PKMTs). Therefore, the ability of PKMTs to direct specific degrees of methylation (i.e., product specificity) is an important property for regulation of chromatin structure and gene expression. Here, the free energy simulations based on quantum mechanical/molecular mechanical (QM/MM) potentials are performed for the first, second. and third methyl transfers from S-adenosyl-L-methionine to the epsilon-amino group of the target lysine/methyl lysine in SET8, one of the important PKMTs. The key questions addressed in this paper include the energetic origin of the product specificity and the reasons for the change of he product specificity as a result of the replacement of Tyr334 by Phe. The free energy barriers for the three methyl transfers in SET8 as well as in the mutant obtained from the simulations are found to be well correlated with the experimental observations on the product specificity of SET8 and the change of product specificity as a result of the mutation. The results support the suggestion that the differential free energy barriers for the methyl transfers may determine, at least in part, how the epigenetic marks of lysine methylation are written by the enzymes. Furthermore, the stability of a water molecule to be located at the active site is examined under different conditions using the free energy simulations, and its role in controlling the product specificity is discussed. The QM/MM molecular dynamics (MD) simulations are also performed on the reactant complexes of the first, second, and third methyl transfers. The results show that the information on the ability of the reactant complexes to form the reactive configurations for the methyl transfers may be used as useful indicators in the prediction of product specificity for PKMIs.
C1 [Chu, Yuzhuo; Xu, Qin; Guo, Hong] Univ Tennessee, Dept Biochem & Cellular & Mol Biol, Knoxville, TN 37996 USA.
[Guo, Hong] Oak Ridge Natl Lab, Ctr Biophys Mol, Oak Ridge, TN 37831 USA.
RP Guo, H (reprint author), Univ Tennessee, Dept Biochem & Cellular & Mol Biol, Knoxville, TN 37996 USA.
EM hguo1@utk.edu
RI Guo, Hong/E-6357-2010; Xu, Qin/O-7310-2015
OI Xu, Qin/0000-0002-8346-9431
FU National Science Foundation [0817940]
FX We thank Dr. Hao-Bo Guo, Mr. Mauricio Valenzuela, and Professors
Xiaodong Cheng and Jeremy C. Smith for useful discussions and Martin
Karplus for a gift of the CHARMM program. This work was supported by the
National Science Foundation (Grant number: 0817940 to HG.). We are also
grateful for the computer time from Indiana University Tera Grid
Resource.
NR 27
TC 10
Z9 11
U1 0
U2 9
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1549-9618
EI 1549-9626
J9 J CHEM THEORY COMPUT
JI J. Chem. Theory Comput.
PD APR
PY 2010
VL 6
IS 4
BP 1380
EP 1389
DI 10.1021/ct9006458
PG 10
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 581XE
UT WOS:000276558100036
ER
PT J
AU Glass, DC
Krishnan, M
Nutt, DR
Smith, JC
AF Glass, Dennis C.
Krishnan, Marimuthu
Nutt, David R.
Smith, Jeremy C.
TI Temperature Dependence of Protein Dynamics Simulated with Three
Different Water Models
SO JOURNAL OF CHEMICAL THEORY AND COMPUTATION
LA English
DT Article
ID NEUTRON-SCATTERING EXPERIMENTS; MOLECULAR-DYNAMICS; GLASS-TRANSITION;
LIQUID WATER; HYDRATION WATER; ENZYME-ACTIVITY; BIOLOGICAL WATER;
TRANSLATIONAL DIFFUSION; DIELECTRIC-RELAXATION; MAGNETIC-RELAXATION
AB The effect of variation of the water model on the tempera lure dependence of protein and hydration water dynamics is examined by performing molecular dynamics simulations of myoglobin with the TIP3P, TIP4P, and TIP5P water models and tie CHARMM protein force field at temperatures between 20 and 300 K. The atomic mean-square displacements, solvent reorientational relaxation times, pair angular correlations between surface water molecules, and time-averaged structures of the protein are all found to be similar, and the protein dynamical transition is described almost indistinguishably for the three water potentials. The results provide evidence that for some purposes changing the water model in protein simulations without a loss of accuracy may be possible.
C1 [Glass, Dennis C.; Krishnan, Marimuthu; Smith, Jeremy C.] Univ Tennessee, ORNL, Ctr Biophys Mol, Oak Ridge, TN 37831 USA.
[Nutt, David R.] Univ Reading, Dept Chem, Reading RG6 6AD, Berks, England.
RP Smith, JC (reprint author), Univ Tennessee, ORNL, Ctr Biophys Mol, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA.
EM smithjc@ornl.gov
RI smith, jeremy/B-7287-2012; Krishnan, Marimuthu/A-6443-2012
OI smith, jeremy/0000-0002-2978-3227;
FU U.S. Department of Energy
FX This work was funded by a U.S. Department of Energy Laboratory Directed
Research and Development grant.
NR 126
TC 23
Z9 23
U1 2
U2 29
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1549-9618
J9 J CHEM THEORY COMPUT
JI J. Chem. Theory Comput.
PD APR
PY 2010
VL 6
IS 4
BP 1390
EP 1400
DI 10.1021/ct9006508
PG 11
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 581XE
UT WOS:000276558100037
ER
PT J
AU Kucharik, M
Garimella, RV
Schofield, SP
Shashkov, MJ
AF Kucharik, Milan
Garimella, Rao V.
Schofield, Samuel P.
Shashkov, Mikhail J.
TI A comparative study of interface reconstruction methods for
multi-material ALE simulations
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Interface reconstruction; Moment-of-fluid method; Compressible flow
ID EULERIAN HYDROCODES; ALGORITHMS; VOLUME; HYDRODYNAMICS; COMPUTATIONS;
TRACKING; FLOW
AB In this paper we compare the performance of different methods for reconstructing interfaces in multi-material compressible flow simulations The methods compared are a material-order-dependent Volume-of-Fluid (VOF) method, a material-order-independent VOF method based on power diagram partitioning of cells and the Moment-of-Fluid method (MOF). We demonstrate that the MOF method provides the most accurate tracking of interfaces, followed by the VOF method with the right material ordering The material-order-independent VOF method performs somewhat worse than the above two while the solutions with VOF using the wrong material order are considerably worse (C) 2009 Published by Elsevier Inc.
C1 [Kucharik, Milan] Czech Tech Univ, Fac Nucl Sci & Phys Engn, CR-11519 Prague, Czech Republic.
[Kucharik, Milan; Garimella, Rao V.; Schofield, Samuel P.; Shashkov, Mikhail J.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Kucharik, M (reprint author), Czech Tech Univ, Fac Nucl Sci & Phys Engn, Brehova 7,Praha1, CR-11519 Prague, Czech Republic.
OI Garimella, Rao/0000-0002-3812-2105
FU National Nuclear Security Administration of the US Department of Energy
at Los Alamos National Laboratory [DE-AC52-06NA25396]; DOE Advanced
Simulation and Computing (ASC); DOE Office of Science ASCR Program;
Czech Ministry of Education [MSM 6840770022]; Czech Grant Agency
[P201/10/P086]
FX This work was performed under the auspices of the National Nuclear
Security Administration of the US Department of Energy at Los Alamos
National Laboratory under Contract No. DE-AC52-06NA25396 and Supported
by the DOE Advanced Simulation and Computing (ASC) program. The authors
acknowledge the partial support of the DOE Office of Science ASCR
Program The first author was Supported in part by the Czech Ministry of
Education Grant MSM 6840770022, and the Czech Grant Agency project
P201/10/P086.
NR 33
TC 37
Z9 43
U1 0
U2 13
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0021-9991
J9 J COMPUT PHYS
JI J. Comput. Phys.
PD APR 1
PY 2010
VL 229
IS 7
BP 2432
EP 2452
DI 10.1016/j.jcp.2009.07.009
PG 21
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 560UI
UT WOS:000274928300002
ER
PT J
AU Werth, CJ
Zhang, CY
Brusseau, ML
Oostrom, M
Baumann, T
AF Werth, Charles J.
Zhang, Changyong
Brusseau, Mark L.
Oostrom, Mart
Baumann, Thomas
TI A review of non-invasive imaging methods and applications in contaminant
hydrogeology research
SO JOURNAL OF CONTAMINANT HYDROLOGY
LA English
DT Review
DE Review; Imaging; Non-invasive; Contaminant hydrogeology
ID X-RAY MICROTOMOGRAPHY; NONAQUEOUS-PHASE LIQUID;
NUCLEAR-MAGNETIC-RESONANCE; HETEROGENEOUS POROUS-MEDIA; PARTICLE
TRACKING VELOCIMETRY; ORGANIC IMMISCIBLE-LIQUID; SYNCHROTRON TOMOGRAPHIC
TECHNIQUES; LATTICE-BOLTZMANN SIMULATIONS; PORE-SCALE CHARACTERIZATION;
SOURCE ZONE ARCHITECTURE
AB Contaminant hydrogeological processes occurring in porous media are typically not amenable to direct observation As a result, indirect measurements (eg, contaminant breakthrough at a fixed location) are often used to infer processes occurring at different scales, locations, or times To overcome this limitation, non-invasive imaging methods are increasingly being used in contaminant hydrogeology research. Four of the most common methods, and the subjects of this review, are optical imaging using UV or visible light, dual-energy gamma radiation, X-ray microtomography. and magnetic resonance imaging (MRI) Non-invasive imaging techniques have provided valuable insights into a variety of complex systems and processes, including porous media characterization. multiphase fluid distribution, fluid flow, solute transport and mixing. colloidal transport and deposition, and reactions In this paper we review the theory underlying these methods, applications of these methods to contaminant hydrogeology research, and methods' advantages and disadvantages As expected, there is no perfect method or tool for non-invasive imaging However, optical methods generally present the least expensive and easiest options for imaging fluid distribution, solute and fluid flow. colloid transport, and reactions in artificial two-dimensional (2D) porous media. Gamma radiation methods present the best opportunity for characterization of fluid distributions in 2D at the Darcy scale X-ray methods present the highest resolution and flexibility for three-dimensional (3D) natural porous media characterization. and 3D characterization of fluid distributions in natural porous media And MRI presents the best option for 3D characterization of fluid distribution, fluid flow, colloid transport, and reaction in artificial porous media. Obvious deficiencies ripe for method development are the ability to image transient processes such as fluid flow and colloid transport in natural porous media in three dimensions, the ability to image many reactions of environmental interest in artificial and natural porous media, and the ability to image selected processes over a range of scales in artificial and natural porous media. (C) 2010 Elsevier B V All rights reserved
C1 [Werth, Charles J.] Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 USA.
[Zhang, Changyong] Pacific Northwes Natl Lab, Div Chem & Mat Sci, Richland, WA 99354 USA.
[Brusseau, Mark L.] Univ Arizona, Dept Soil Water & Environm Sci, Tucson, AZ 85721 USA.
[Brusseau, Mark L.] Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA.
[Oostrom, Mart] Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99354 USA.
[Baumann, Thomas] Tech Univ Munich, Inst Hydrochem, D-81377 Munich, Germany.
RP Werth, CJ (reprint author), Univ Illinois, Dept Civil & Environm Engn, 205 N Mathews Ave, Urbana, IL 61801 USA.
RI Zhang, Changyong/A-8012-2013
FU Humboldt Foundation; Deutsche Forschungsgemeinschaft (DFG); NIEHS SBRP;
Environmental Molecular Sciences Laboratory (EMSL); DOE's Office of
Biological and Environmental Research [DE-AC06-76RLO 1830]
FX Partial support for CJW was provided by the Humboldt Foundation Partial
support for TB was provided by the Deutsche Forschungsgemeinschaft
(DFG). Partial support for MLB was provided by the NIEHS SBRP. The
contribution by M Oostrom was supported by the Environmental Molecular
Sciences Laboratory (EMSL), a national scientific user facility
sponsored by the DOE's Office of Biological and Environmental Research
and located at Pacific Northwest National Laboratory PNNL is operated by
the Battelle Memorial Institute for the Department of Energy (DOE) under
Contract DE-AC06-76RLO 1830.
NR 249
TC 83
Z9 84
U1 5
U2 105
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0169-7722
EI 1873-6009
J9 J CONTAM HYDROL
JI J. Contam. Hydrol.
PD APR 1
PY 2010
VL 113
IS 1-4
BP 1
EP 24
DI 10.1016/j.jconhyd.2010.01.001
PG 24
WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources
SC Environmental Sciences & Ecology; Geology; Water Resources
GA 584PZ
UT WOS:000276766000001
PM 20163885
ER
PT J
AU Jackson, CB
Servant, G
Shaughnessy, G
Tait, TMP
Taoso, M
AF Jackson, C. B.
Servant, Geraldine
Shaughnessy, Gabe
Tait, Tim M. P.
Taoso, Marco
TI Higgs in space!
SO JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
LA English
DT Article
DE dark matter theory; dark matter experiments; gamma ray experiments;
cosmology of theories beyond the SM
ID DARK-MATTER; NEUTRALINO ANNIHILATION; GALACTIC-CENTER; 2 PHOTONS; FERMI;
MODEL; CANDIDATE; PARTICLE; BOSON; RAYS
AB We consider the possibility that the Higgs can be produced in dark matter annihilations, appearing as a line in the spectrum of gamma rays at an energy determined by the masses of the WIMP and the Higgs itself. We argue that this phenomenon occurs generally in models in which the the dark sector has large couplings to the most massive states of the SM and provide a simple example inspired by the Randall-Sundrum vision of dark matter, whose 4d dual corresponds to electroweak symmetry-breaking by strong dynamics which respect global symmetries that guarantee a stable WIMP. The dark matter is a Dirac fermion that couples to a Z' acting as a portal to the Standard Model through its strong coupling to top quarks. Annihilation into light standard model degrees of freedom is suppressed and generates a feeble continuum spectrum of gamma rays. Loops of top quarks mediate annihilation into gamma Z, gamma h, and gamma Z', providing a forest of lines in the spectrum. Such models can be probed by the Fermi/GLAST satellite and ground-based Air Cherenkov telescopes.
C1 [Jackson, C. B.; Shaughnessy, Gabe; Tait, Tim M. P.] Argonne Natl Lab, HEP Div, Argonne, IL 60439 USA.
[Servant, Geraldine; Taoso, Marco] CERN, Dept Phys, Div Theory, CH-1211 Geneva 23, Switzerland.
[Shaughnessy, Gabe; Tait, Tim M. P.] Northwestern Univ, Evanston, IL 60208 USA.
[Tait, Tim M. P.] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA.
[Taoso, Marco] Univ Valencia, IFIC, CSIC, Ed Inst, Valencia 46071, Spain.
RP Jackson, CB (reprint author), Argonne Natl Lab, HEP Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM jackson@hep.anl.gov; geraldine.servant@cern.ch;
g-shaughnessy@northwestern.edu; ttait@uci.edu; marco.taoso@ific.uv.es
FU Department of Energy [DE-AC02-06CH11357, DE-FG02-91ER40684]; MICINN
[FPA2008-00319]; Generalitat Valenciana [PROMETEO/2009/091]; European
Council [UNILHC PITN-GA-2009-237920]
FX The authors are grateful for inspiration and conversation involving
Elliot Bloom, Marco Cirelli, Laura Covi, Abdelhak Djouadi, Michele Doro,
Jim Henson, Alejandro Ibarra, Emmanuel Moulin, Simona Murgia, Pasquale
Serpico, Jing Shu, and James Wells. We also thank Genevieve Belanger and
Sasha Pukhov for helping with MicrOMEGAs. This research is supported by
the European Research Council Starting Grant Cosmo@LHC. T. Tait is
grateful to the SLAC theory group for their extraordinary generosity
during his many visits. Research at Argonne National Laboratory is
supported in part by the Department of Energy under contract
DE-AC02-06CH11357. Research at Northwestern University is supported in
part by the Department of Energy under contract DE-FG02-91ER40684. The
work of M. Taoso is partly supported by the Spanish grants FPA2008-00319
(MICINN) and PROMETEO/2009/091 (Generalitat Valenciana) and the European
Council (Contract Number UNILHC PITN-GA-2009-237920).
NR 99
TC 55
Z9 55
U1 0
U2 2
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 1475-7516
J9 J COSMOL ASTROPART P
JI J. Cosmol. Astropart. Phys.
PD APR
PY 2010
IS 4
AR 004
DI 10.1088/1475-7516/2010/04/004
PG 29
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 596KV
UT WOS:000277684600029
ER
PT J
AU Zepeda-Ruiz, LA
Gilmer, GH
Walton, CC
Hamza, AV
Chason, E
AF Zepeda-Ruiz, Luis A.
Gilmer, George H.
Walton, Christopher C.
Hamza, Alex V.
Chason, Eric
TI Surface morphology evolution during sputter deposition of thin films -
lattice Monte Carlo simulations
SO JOURNAL OF CRYSTAL GROWTH
LA English
DT Article; Proceedings Paper
CT 17th Amer Conference on Crystal Growth and Epitaxy/14th United States
Biennial Workshop on Organometallic Vapor Phase Epitaxy/6th Inter
Workshop on Modeling in Crystal Growth
CY AUG 09-14, 2009
CL Lake Geneva, WI
SP Amer Assoc Crystal Growth
DE Computer simulation; Diffusion; Nucleation; Roughening; Surface
structure; Physical vapor deposition process
AB The growth of uniform thin films on foreign substrates is impeded by several morphological instabilities. Hill-and-valley structures are formed and enhanced during sputter deposition where surface height perturbations have an opportunity to grow to large amplitudes. We show via kinetic Monte Carlo (kMC) simulations that while surface roughness can be partially controlled by changing growth conditions, such as substrate temperature, the diffusion of particles over step edges plays a very important role in determining both surface roughness and the density of the films. Our kMC simulations provide a way to evaluate the strength of surface instabilities during sputter deposition of thin films. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Zepeda-Ruiz, Luis A.; Gilmer, George H.; Walton, Christopher C.; Hamza, Alex V.] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA.
[Chason, Eric] Brown Univ, Div Engn, Providence, RI 02912 USA.
RP Zepeda-Ruiz, LA (reprint author), Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA.
EM zepedaruiz1@llnl.gov
NR 7
TC 10
Z9 10
U1 0
U2 18
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0022-0248
J9 J CRYST GROWTH
JI J. Cryst. Growth
PD APR 1
PY 2010
VL 312
IS 8
BP 1183
EP 1187
DI 10.1016/j.jcrysgro.2009.12.035
PG 5
WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied
SC Crystallography; Materials Science; Physics
GA 588AU
UT WOS:000277039100030
ER
PT J
AU Bizarri, G
AF Bizarri, G.
TI Scintillation mechanisms of inorganic materials: From crystal
characteristics to scintillation properties
SO JOURNAL OF CRYSTAL GROWTH
LA English
DT Article; Proceedings Paper
CT 17th Amer Conference on Crystal Growth and Epitaxy/14th United States
Biennial Workshop on Organometallic Vapor Phase Epitaxy/6th Inter
Workshop on Modeling in Crystal Growth
CY AUG 09-14, 2009
CL Lake Geneva, WI
SP Amer Assoc Crystal Growth
DE Characterization; Defects; Computer simulation; Scintillators
ID ENERGY
AB Finding new inorganic scintillator crystals with better performance for demanding applications, such as high-energy physics, medical imaging, and radiation detection, has been a long-standing challenge. Thanks to an intensive interdisciplinary effort between theoreticians, experimentalists and crystal growers, current scintillator performances are reaching the intrinsic limits imposed by the crystal. However, demand continues for more efficient scintillators with higher light output, better energy resolution and lower cost of production. This article discusses the basic concepts of scintillation in inorganic materials, focusing on how physics can provide pathways to assist in scintillator discovery. Published by Elsevier B.V.
C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Dept Radiotracer Dev & Med Imaging, Berkeley, CA 94720 USA.
RP Bizarri, G (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Dept Radiotracer Dev & Med Imaging, Berkeley, CA 94720 USA.
EM gabizarri@lbl.gov
NR 12
TC 8
Z9 8
U1 0
U2 7
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0022-0248
J9 J CRYST GROWTH
JI J. Cryst. Growth
PD APR 1
PY 2010
VL 312
IS 8
BP 1213
EP 1215
DI 10.1016/j.jcrysgro.2009.12.063
PG 3
WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied
SC Crystallography; Materials Science; Physics
GA 588AU
UT WOS:000277039100036
ER
PT J
AU Cederberg, JG
Leonhardt, D
Sheng, JJ
Li, QM
Carroll, MS
Han, SM
AF Cederberg, Jeffrey G.
Leonhardt, Darin
Sheng, Josephine J.
Li, Qiming
Carroll, Malcolm S.
Han, Sang M.
TI GaAs/Si epitaxial integration utilizing a two-step, selectively grown Ge
intermediate layer
SO JOURNAL OF CRYSTAL GROWTH
LA English
DT Article; Proceedings Paper
CT 17th Amer Conference on Crystal Growth and Epitaxy/14th United States
Biennial Workshop on Organometallic Vapor Phase Epitaxy/6th Inter
Workshop on Modeling in Crystal Growth
CY AUG 09-14, 2009
CL Lake Geneva, WI
SP Amer Assoc Crystal Growth
DE Metal-organic vapor phase epitaxy; Molecular beam epitaxy;
Semiconducting III-V materials; Semiconducting germanium
ID MOLECULAR-BEAM EPITAXY; CHEMICAL-VAPOR-DEPOSITION; ANTIPHASE BOUNDARIES;
ATOMIC-RESOLUTION; ROOM-TEMPERATURE; BUFFER LAYERS; SI; HETEROEPITAXY;
SILICON; ANNIHILATION
AB We describe efforts to epitaxially integrate GaAs with Si, using thin, relaxed Ge layers. The Ge films are deposited by molecular beam epitaxy using a self-assembled, selective-area growth technique, where atomic Ge etches an SiO(2) mask layer and then grows from pores extending to the Si substrate. The resulting Ge film coalesces over the SiO(2) mask and is planarized, using H(2)O(2)-based chemical-mechanical polishing. We subsequently deposit a GaAs/AlAs heterostructure on the polished Ge on Si substrate by metal-organic vapor phase epitaxy. While the initial Ge films were completely relaxed and dislocation-free, they contain a high density of stacking faults that propagate through the GaAs/AlAs heterostructure. These stacking faults create phase domains that appear as non-radiative recombination centers in cathodoluminescence images. Further development of two-step Ge epitaxy with an anneal near the Ge melting point eliminates stacking faults in the Ge, but decomposes the SiO(2) mask allowing threading dislocations to form and propagate through the GaAs/AlAs heterostructure. We discuss our strategy to prevent the loss of the SiO(2) mask and thus reduce threading dislocations. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Cederberg, Jeffrey G.; Sheng, Josephine J.; Li, Qiming; Carroll, Malcolm S.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Leonhardt, Darin; Han, Sang M.] Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA.
RP Cederberg, JG (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM jgceder@sandia.gov
NR 30
TC 12
Z9 12
U1 5
U2 29
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0022-0248
J9 J CRYST GROWTH
JI J. Cryst. Growth
PD APR 1
PY 2010
VL 312
IS 8
BP 1291
EP 1296
DI 10.1016/j.jcrysgro.2009.10.061
PG 6
WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied
SC Crystallography; Materials Science; Physics
GA 588AU
UT WOS:000277039100050
ER
PT J
AU Cederberg, JG
Bender, DA
Pack, MV
Schmitt, RL
AF Cederberg, J. G.
Bender, D. A.
Pack, M. V.
Schmitt, R. L.
TI Observation of optical bleaching at 1.06 mu m in AlInAs/AlGaInAs
multiple quantum wells
SO JOURNAL OF CRYSTAL GROWTH
LA English
DT Article; Proceedings Paper
CT 17th Amer Conference on Crystal Growth and Epitaxy/14th United States
Biennial Workshop on Organometallic Vapor Phase Epitaxy/6th Inter
Workshop on Modeling in Crystal Growth
CY AUG 09-14, 2009
CL Lake Geneva, WI
SP Amer Assoc Crystal Growth
DE Metalorganic vapor phase epitaxy; Quantum wells; Semiconducting III-V
materials; Nonlinear optical
ID VAPOR-PHASE EPITAXY; SOLID-STATE LASERS; NONLINEAR SPECTROSCOPY; DEVICE
APPLICATIONS; SATURABLE ABSORBER; ROOM-TEMPERATURE; QUALITY ALINAS;
CASCADE LASERS; OMVPE GROWTH; SEMICONDUCTORS
AB We investigated the growth and optical properties of Al(0.48)In(0.52)As/Al(0.27)Ga(0.21)In(0.52)As multiple quantum wells. Conditions were established for the defect-free growth of Al(0.48)In(0.52)As by metalorganic vapor phase epitaxy and multiple-quantum-well saturable absorbers were fabricated. Simulation of X-ray diffraction patterns indicated that the interfaces in this system are abrupt without unintentional interface layers. Cross-sectional transmission electron microscopy proved that structural defects are absent for structures exceeding 6 mu m in thickness. Room temperature photoluminescence displayed a nearly constant linewidth as the number of quantum-well periods is increased, further attesting to the optical quality of these structures. Using transient pump-probe optical techniques, we measured the absorbance bleaching decay of a saturable absorber. These measurements suggested that the bleaching lifetime is over 100 ns, which should be sufficient for Q-switching solid-state lasers. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Cederberg, J. G.; Bender, D. A.; Pack, M. V.; Schmitt, R. L.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Cederberg, JG (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM jgceder@sandia.gov
NR 22
TC 1
Z9 2
U1 0
U2 3
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0022-0248
J9 J CRYST GROWTH
JI J. Cryst. Growth
PD APR 1
PY 2010
VL 312
IS 8
BP 1375
EP 1378
DI 10.1016/j.jcrysgro.2009.10.065
PG 4
WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied
SC Crystallography; Materials Science; Physics
GA 588AU
UT WOS:000277039100067
ER
PT J
AU Buban, JP
Ramasse, Q
Gipson, B
Browning, ND
Stahlberg, H
AF Buban, James P.
Ramasse, Quentin
Gipson, Bryant
Browning, Nigel D.
Stahlberg, Henning
TI High-resolution low-dose scanning transmission electron microscopy
SO JOURNAL OF ELECTRON MICROSCOPY
LA English
DT Article
DE STEM; low-dose; aberration correction
ID CRYOELECTRON MICROSCOPY; MEMBRANE-PROTEINS; CRYSTALS; CRYSTALLOGRAPHY;
LIMITATIONS; CRITERION; SPECIMENS; LATTICE; IMAGES; MODEL
AB During the past two decades instrumentation in scanning transmission electron microscopy (STEM) has pushed toward higher intensity electron probes to increase the signal-to-noise ratio of recorded images. While this is suitable for robust specimens, biological specimens require a much reduced electron dose for high-resolution imaging. We describe here protocols for low-dose STEM image recording with a conventional field-emission gun STEM, while maintaining the high-resolution capability of the instrument. Our findings show that a combination of reduced pixel dwell time and reduced gun current can achieve radiation doses comparable to low-dose TEM.
C1 [Buban, James P.; Gipson, Bryant; Stahlberg, Henning] Univ Calif Davis, Coll Biol Sci, Dept Mol & Cellular Biol, Davis, CA 95616 USA.
[Ramasse, Quentin] Lawrence Berkeley Natl Lab, Berkeley, CA USA.
[Browning, Nigel D.] Univ Calif Davis, Dept Chem & Mat Sci, Davis, CA 95616 USA.
[Browning, Nigel D.] Lawrence Livermore Natl Lab, Div Mat Sci & Technol, Livermore, CA 94550 USA.
[Browning, Nigel D.] Lawrence Livermore Natl Lab, Chem Mat Earth & Life Sci Directorate, Livermore, CA 94550 USA.
RP Buban, JP (reprint author), Univ Calif Davis, Coll Biol Sci, Dept Mol & Cellular Biol, 1 Shields Ave, Davis, CA 95616 USA.
EM james.buban@gmail.com
RI Stahlberg, Henning/H-1868-2011;
OI Stahlberg, Henning/0000-0002-1185-4592; Browning,
Nigel/0000-0003-0491-251X
FU University of Tokyo [JEM-2100F/Cs]
FX We thank Professor Yuichi Ikuhara at the University of Tokyo for
permission to use the JEOL JEM-2100F/Cs. We also thank Ken Downing and
Bob Glaeser for fruitful discussions.
NR 31
TC 33
Z9 33
U1 0
U2 29
PU OXFORD UNIV PRESS
PI OXFORD
PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
SN 0022-0744
J9 J ELECTRON MICROSC
JI J. Electron Microsc.
PD APR
PY 2010
VL 59
IS 2
BP 103
EP 112
DI 10.1093/jmicro/dfp052
PG 10
WC Microscopy
SC Microscopy
GA 581MM
UT WOS:000276527700002
PM 19915208
ER
PT J
AU Som, S
Aggarwal, SK
El-Hannouny, EM
Longman, DE
AF Som, S.
Aggarwal, S. K.
El-Hannouny, E. M.
Longman, D. E.
TI Investigation of Nozzle Flow and Cavitation Characteristics in a Diesel
Injector
SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE
ASME
LA English
DT Article
ID STRESS; LIQUID
AB Cavitation and turbulence inside a diesel injector play a critical role in primary spray breakup and development processes. The study of cavitation in realistic injectors is challenging, both theoretically and experimentally, since the associated two-phase flow field is turbulent and highly complex, characterized by large pressure gradients and small orifice geometries. We report herein a computational investigation of the internal nozzle flow and cavitation characteristics in a diesel injector. A mixture based model in FLUENT V6.2 software is employed for simulations. In addition, a new criterion for cavitation inception based on the total stress is implemented, and its effectiveness in predicting cavitation is evaluated. Results indicate that under realistic diesel engine conditions, cavitation patterns inside the orifice are influenced by the new cavitation criterion. Simulations are validated using the available two-phase nozzle flow data and the rate of injection measurements at various injection pressures (800-1600 bar) from the present study. The computational model is then used to characterize the effects of important injector parameters on the internal nozzle flow and cavitation behavior, as well as on flow properties at the nozzle exit. The parameters include injection pressure, needle lift position, and fuel type. The propensity of cavitation for different on-fleet diesel fuels is compared with that for n-dodecane, a diesel fuel surrogate. Results indicate that the cavitation characteristics of n-dodecane are significantly different from those of the other three fuels investigated. The effect of needle movement on cavitation is investigated by performing simulations at different needle lift positions. Cavitation patterns are seen to shift dramatically as the needle lift position is changed during an injection event. The region of significant cavitation shifts from top of the orifice to bottom of the orifice as the needle position is changed from fully open (0.275 mm) to nearly closed (0.1 mm), and this behavior can be attributed to the effect of needle position on flow patterns upstream of the orifice. The results demonstrate the capability of the cavitation model to predict cavitating nozzle flows in realistic diesel injectors and provide boundary conditions, in terms of vapor fraction, velocity, and turbulence parameters at the nozzle exit, which can be coupled with the primary breakup simulation. [DOI: 10.1115/1.3203146]
C1 [Som, S.; Aggarwal, S. K.] Univ Illinois, Dept Mech & Ind Engn, Chicago, IL 60607 USA.
[El-Hannouny, E. M.; Longman, D. E.] Argonne Natl Lab, Ctr Transportat Res, Argonne, IL 60439 USA.
RP Som, S (reprint author), Univ Illinois, Dept Mech & Ind Engn, 842 W Taylor St, Chicago, IL 60607 USA.
EM ssom1@uic.edu
FU U.S. Department of Energy Office of Vehicle Technology
[DE-AC02-06CH11357]
FX This work has been supported by the U.S. Department of Energy Office of
Vehicle Technology under the management of Gurpreet Singh. Many useful
discussions with Dr. Chris Powell and Dr. Alan Kastengren at Argonne
National Laboratory are greatly appreciated. The submitted manuscript
has been created by UChicago Argonne, LLC, Operator of Argonne National
Laboratory ("Argonne"). Argonne, a U.S. Department of Energy Office of
Science laboratory, is operated under Contract No. DE-AC02-06CH11357.
NR 43
TC 34
Z9 35
U1 1
U2 29
PU ASME
PI NEW YORK
PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0742-4795
J9 J ENG GAS TURB POWER
JI J. Eng. Gas. Turbines Power-Trans. ASME
PD APR
PY 2010
VL 132
IS 4
AR 042802
DI 10.1115/1.3203146
PG 12
WC Engineering, Mechanical
SC Engineering
GA 549AL
UT WOS:000274013000016
ER
PT J
AU Nguyen, TD
Yeager, JD
Bahr, DF
Adams, DP
Moody, NR
AF Nguyen, Thao D.
Yeager, J. D.
Bahr, D. F.
Adams, D. P.
Moody, N. R.
TI Nanoindentation of Compliant Substrate Systems: Effects of Geometry and
Compliance
SO JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME
LA English
DT Article
DE bending; finite element analysis; nanoindentation; plates (structures);
substrates; thin films; Young's modulus
ID SPHERICAL NANO-INDENTATION; COATED SYSTEMS; LAYERED SYSTEM; HARD FILMS
AB Nanoindentation is widely used to characterize the mechanical and interfacial properties of thin film systems. However, the effects of substrate compliance on the indentation response of compliant substrate systems are not well understood. This paper investigates the effects of the large compliance mismatch between the film and the substrate and of the film thickness for model systems using nanoindentation tests, finite element simulations, and an analytical model based on a classical plate-bending solution. The results showed that for displacements less than the film thickness and for ratio of the substrate to film modulus less than 100. The indentation force-displacement response exhibits a linear relationship that can be predicted accurately by the linear plate-bending model. The effective stiffness depends linearly on the film thickness and also on the substrate and film moduli. For larger displacements, the indentation response exhibits the scaling relationship of the nonlinear plate-bending model.
C1 [Nguyen, Thao D.] Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA.
[Yeager, J. D.; Bahr, D. F.] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA.
[Adams, D. P.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Moody, N. R.] Sandia Natl Labs, Livermore, CA 94550 USA.
RP Nguyen, TD (reprint author), Johns Hopkins Univ, Dept Mech Engn, Baltimore, MD 21218 USA.
EM vicky.nguyen@jhu.edu
RI Nguyen, Thao/A-3391-2010; Bahr, David/A-6521-2012;
OI Nguyen, Thao/0000-0002-0312-1583; Bahr, David/0000-0003-2893-967X;
Yeager, John/0000-0002-3121-6053
FU Laboratory Directed Research and Development program at Sandia National
Laboratories; United States Department of Energy [DE-ACO4-94AL85000]
FX This work was funded by the Laboratory Directed Research and Development
program at Sandia National Laboratories. Sandia is a multiprogram
laboratory operated by Sandia Corporation, a Lockheed Martin Co., for
the United States Department of Energy under Contract No.
DE-ACO4-94AL85000.
NR 16
TC 1
Z9 1
U1 1
U2 3
PU ASME-AMER SOC MECHANICAL ENG
PI NEW YORK
PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0094-4289
J9 J ENG MATER-T ASME
JI J. Eng. Mater. Technol.-Trans. ASME
PD APR
PY 2010
VL 132
IS 2
AR 021001
DI 10.1115/1.4000230
PG 7
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA 569HC
UT WOS:000275586200001
ER
PT J
AU Johnson, EL
Clabough, TS
Caudill, CC
Keefer, ML
Peery, CA
Richmond, MC
AF Johnson, E. L.
Clabough, T. S.
Caudill, C. C.
Keefer, M. L.
Peery, C. A.
Richmond, M. C.
TI Migration depths of adult steelhead Oncorhynchus mykiss in relation to
dissolved gas supersaturation in a regulated river system
SO JOURNAL OF FISH BIOLOGY
LA English
DT Article
DE behaviour; data storage tags; gas bubble disease; hydrostatic
compensation
ID SUMMER CHINOOK SALMON; BUBBLE TRAUMA SIGNS; COLUMBIA RIVER; JUVENILE
SALMONIDS; SNAKE RIVERS; WATER; DOWNSTREAM; RATES; FISH; MORTALITY
AB Adult steelhead Oncorhynchus mykiss tagged with archival transmitters primarily migrated through a large river corridor at depths > 2 m interspersed with frequent but short (< 5 min) periods closer to the surface. The recorded swimming depths and behaviours probably provided adequate hydrostatic compensation for the supersaturated dissolved gas conditions encountered and probably limited development of gas bubble disease (GBD). Results parallel those from a concurrent adult Chinook salmon Oncorhynchus tshawytscha study, except O. mykiss experienced greater seasonal variability and were more likely to have depth uncompensated supersaturation exposure in some dam tailraces, perhaps explaining the higher incidence of GBD in this species.
C1 [Johnson, E. L.; Clabough, T. S.; Caudill, C. C.; Keefer, M. L.] Univ Idaho, Coll Nat Resources, Dept Fish & Wildlife Resources, Moscow, ID 83844 USA.
[Peery, C. A.] US Fish & Wildlife Serv, Idaho Fishery Resource Off, Ahsahka, ID 83520 USA.
[Richmond, M. C.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Johnson, EL (reprint author), Univ Idaho, Coll Nat Resources, Dept Fish & Wildlife Resources, Moscow, ID 83844 USA.
EM ejohnson@uidaho.edu
RI Richmond, Marshall/D-3915-2013; Caudill, Christopher/M-7906-2014
OI Richmond, Marshall/0000-0003-0111-1485;
FU U.S. Army Corps of Engineers
FX Many people provided time and assistance during the course of this
study. We thank K. Tolotti, M. Jepson, S. Lee, R. Ringe, C. Boggs, T.
Goniea, M. Heinrich, B. High, D. Joosten, M. Morasch, T. Dick and B.
Winans at the University of Idaho for helping with field operations and
collection and processing telemetry data. A. Matter and B. Burke,
National Marine Fisheries Service, helped with data management and
analysis. The U.S. Army Corps of Engineers provided funding for this
study.
NR 34
TC 6
Z9 7
U1 2
U2 18
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0022-1112
J9 J FISH BIOL
JI J. Fish Biol.
PD APR
PY 2010
VL 76
IS 6
BP 1520
EP 1528
DI 10.1111/j.1095-8649.2010.02578.x
PG 9
WC Fisheries; Marine & Freshwater Biology
SC Fisheries; Marine & Freshwater Biology
GA 587OM
UT WOS:000277002100020
PM 20537031
ER
PT J
AU Han, J
Papalambros, PY
AF Han, Jeongwoo
Papalambros, Panos Y.
TI Optimal Design of Hybrid Electric Fuel Cell Vehicles Under Uncertainty
and Enterprise Considerations
SO JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY
LA English
DT Article
ID INSERTION CELL; OPTIMIZATION; SYSTEMS
AB Hybrid electric fuel cell vehicles are studied using a system perspective that explores the tradeoffs among fuel economy, acceleration, and other vehicle attributes. Design decisions are derived from an enterprise decision-making model that seeks to maximize profit. Uncertainties stemming from manufacturing variability, customer preferences, and market response to fuel price fluctuations are also included. The system is hierarchically partitioned into three levels that comprise enterprise, powertrain, fuel cell, and battery subsystem models. Analytical target cascading, a decomposition-based multidisciplinary design optimization strategy, is used to solve the resulting problem. Results indicate a strong interaction between enterprise and engineering considerations, and a significant impact of uncertainty on the optimal system design. [DOI: 10.1115/1.3179762]
C1 [Han, Jeongwoo] Argonne Natl Lab, Argonne, IL 60439 USA.
[Papalambros, Panos Y.] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA.
RP Han, J (reprint author), Argonne Natl Lab, 9700 S Cass Ave,Bldg 362, Argonne, IL 60439 USA.
EM jhan@anl.gov
FU Automotive Research Center; U. S. Army Center of Excellence in Modeling
and Simulation of Ground Vehicle Systems at the University of Michigan;
NSF [DMI-0503737]
FX This work was partially supported by the Automotive Research Center, a
U. S. Army Center of Excellence in Modeling and Simulation of Ground
Vehicle Systems at the University of Michigan, and NSF Grant No.
DMI-0503737. This support is gratefully acknowledged. The results and
opinions expressed here are solely those of the authors.
NR 40
TC 2
Z9 2
U1 2
U2 7
PU ASME-AMER SOC MECHANICAL ENG
PI NEW YORK
PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA
SN 1550-624X
J9 J FUEL CELL SCI TECH
JI J. Fuel Cell Sci. Technol.
PD APR
PY 2010
VL 7
IS 2
AR 021020
DI 10.1115/1.3179762
PG 9
GA 549AN
UT WOS:000274013200020
ER
PT J
AU Wang, HL
Teeter, G
Turner, JA
AF Wang, Heli
Teeter, Glenn
Turner, John A.
TI Plasma Nitrided Type 349 Stainless Steel for Polymer Electrolyte
Membrane Fuel Cell Bipolar Plate-Part I: Nitrided in Nitrogen Plasma
SO JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY
LA English
DT Article
DE plasma nitridation; bipolar plate; PEMFC; stainless steel; corrosion
ID CORROSION-RESISTANCE; PITTING CORROSION; PASSIVE FILMS; SURFACE; ALLOYS;
XPS; BEHAVIOR; 316L; TEMPERATURE; MOLYBDENUM
AB An austenite 349 stainless steel was nitrided via nitrogen plasma. Glancing angle X-ray diffraction patterns suggest that the nitrided layer is amorphous. X-ray photoelectron spectroscopy analysis indicated that the plasma nitridation process produced bulk-type nitrides in the surface layer. In general, the nitrided layer was composed of iron oxide in the outer layer and chromium oxide in the inner layers. Contaminations of vanadium and tin were detected in the as-grown nitrided layer; these dissolved away after polarization. The influence of these contaminants on the corrosion resistance of the nitrided layer in polymer electrolyte membrane fuel cell (PEMFC) environments is not considered significant. The nitrided sample had a much higher contact resistance than the bare one and the contact resistance increased with the nitriding time. The high interfacial contact resistance values can be related to the thicker oxide film after plasma nitridation. The corrosion resistances obtained for the 1 h nitrided and bare stainless steels in simulated PEMFC environments were similar. The outmost nitrided layer dissolved after polarization in the PEMFC environments leaving a passive film (modified with nitrides), similar to that of bare stainless steel under the same conditions. The passive film thickness was 3.7 nm for nitrided steel in PEMFC cathode environment and 4.2 nm for nitrided steel in PEMFC anode environment. [DOI: 10.1115/1.3178555]
C1 [Wang, Heli; Teeter, Glenn; Turner, John A.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Wang, HL (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA.
EM heli.wang@nrel.gov
FU U. S. Department of Energy
FX The authors thank Mr. James Halliday from J&L Specialty Steel, Inc., now
part of Allegheny Ludlum Corp., for the stainless steel samples. Dr.
Ping Liu is acknowledged for assisting the plasma nitridation process.
This work was supported by the Hydrogen, Fuel Cells and Infrastructure
Technologies Program of the U. S. Department of Energy.
NR 47
TC 5
Z9 5
U1 0
U2 7
PU ASME
PI NEW YORK
PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA
SN 1550-624X
EI 1551-6989
J9 J FUEL CELL SCI TECH
JI J. Fuel Cell Sci. Technol.
PD APR
PY 2010
VL 7
IS 2
AR 021018
DI 10.1115/1.3178555
PG 7
GA 549AN
UT WOS:000274013200018
ER
PT J
AU Wang, HL
Teeter, G
Turner, JA
AF Wang, Heli
Teeter, Glenn
Turner, John A.
TI Plasma Nitrided Type 349 Stainless Steel for Polymer Electrolyte
Membrane Fuel Cell Bipolar Plate-Part II: Nitrided in Ammonia Plasma
SO JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY
LA English
DT Article
DE plasma nitridation; bipolar plate; PEMFC; stainless steel; corrosion
ID PASSIVE FILMS; BEHAVIOR; XPS; 316L
AB Austenitic 349 stainless steel was nitrided in an NH(3) plasma. A low interfacial contact resistance was obtained with the nitrided steel. Glancing angle X-ray diffraction suggests that the nitrided layer is very thin and possibly amorphous. X-ray photoelectron spectroscopy (XPS) studies show that the nitrided layer is composed of mixed oxides and nitrides of Fe(3+) and Cr(3+). Contaminations of V and Sn were also observed, though their influence on the as-nitrided surface conductivity is not clear. The nitrided samples were investigated in a simulated polymer electrolyte membrane fuel cell (PEMFC) environment, and showed excellent corrosion resistance. The XPS depth profile indicated that the passive film, which formed on the plasma-nitrided steel in the PEMFC anode environment, is composed of mixed oxides and nitrides, in which chromium oxide/nitride dominates the surface chemistry. No V or Sn was detected on the surface after the polarization tests. For the PEMFC bipolar plate application, nitridation in NH(3) plasma is a promising surface treatment approach, though more research is needed to investigate the influence of the plasma density and substrate bias on the surface conductivity and performance of the nitrided steel in PEMFC environments. [DOI: 10.1115/1.3178640]
C1 [Wang, Heli; Teeter, Glenn; Turner, John A.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Wang, HL (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA.
EM heli.wang@nrel.gov
FU U. S. Department of Energy
FX The authors wish to thank Mr. James Halliday of J & L Specialty Steel,
Inc., which is now part of Allegheny Ludlum Corp., for the stainless
steels samples. Dr. Ping Liu is acknowledged for assisting in the
plasma-nitridation process. This work was supported by the Hydrogen
Program of the U. S. Department of Energy.
NR 20
TC 3
Z9 3
U1 0
U2 11
PU ASME-AMER SOC MECHANICAL ENG
PI NEW YORK
PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA
SN 1550-624X
J9 J FUEL CELL SCI TECH
JI J. Fuel Cell Sci. Technol.
PD APR
PY 2010
VL 7
IS 2
AR 021019
DI 10.1115/1.3178640
PG 6
GA 549AN
UT WOS:000274013200019
ER
PT J
AU Welling, DT
Ridley, AJ
AF Welling, D. T.
Ridley, A. J.
TI Exploring sources of magnetospheric plasma using multispecies MHD
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID INTERPLANETARY MAGNETIC-FIELD; SHEET ION COMPOSITION; SOLAR-WIND
CONTROL; ART. NO. 1151; GEOTAIL OBSERVATIONS; EARTHS MAGNETOTAIL; POLAR;
MODEL; IMF; MAGNETOHYDRODYNAMICS
AB A persistent, unresolved problem in terrestrial magnetospheric physics is determining the dominant source and associated entry mechanism for plasma in the Earth's magnetosphere. This study uses the multispecies MHD code, Block Adaptive Tree Solar Wind Roe-Type Upwind Scheme (BATS-R-US), to investigate this issue. Two proton species, ionospheric origin and solar wind origin, are defined in the system and the evolution of each population is followed under different idealized solar wind conditions. It is found that during southward oriented interplanetary magnetic field (IMF), the dominant source is ionospheric plasma entering deep down tail through reconnecting field lines. During northward IMF, the dominant source is solar wind plasma entering through the flanks of the magnetosphere. This two-mode behavior is tested through data-model comparisons of real world simulations. Comparisons of model results against Los Alamos National Laboratory Magnetospheric Plasma Analyzer density, pressure, and inferred oxygen content support the conclusions of the idealized results.
C1 [Welling, D. T.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Ridley, A. J.] Univ Michigan, Dept Atmospher Ocean & Space Sci, Ann Arbor, MI 48109 USA.
RP Welling, DT (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM dwelling@lanl.gov
RI Ridley, Aaron/F-3943-2011; Welling, Daniel/C-1970-2013
OI Ridley, Aaron/0000-0001-6933-8534;
FU NSF [ATM 0325332, NNH07AG24I, ATM0703210]
FX The authors acknowledge the use of data from the ACE satellite MAG and
SWEPAM instruments provided by NASA GSFC Space Physics Data Facility.
LANL MPA data provided by Michelle Thomsen as well as data expertise
provided by Michael Liemohn and Michelle Thomsen are greatly
appreciated. These inputs were crucial to this study. This work was
supported by NSF grants ATM 0325332 and NNH07AG24I and NSF grant
ATM0703210.
NR 51
TC 17
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U1 0
U2 0
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-9380
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD APR 1
PY 2010
VL 115
AR A04201
DI 10.1029/2009JA014596
PG 18
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 578TN
UT WOS:000276318700001
ER
PT J
AU Akhmedov, EK
Kopp, J
AF Akhmedov, Evgeny Kh.
Kopp, Joachim
TI Neutrino oscillations: quantum mechanics vs. quantum field theory
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE Neutrino Physics; Solar and Atmospheric Neutrinos
ID COHERENCE
AB A consistent description of neutrino oscillations requires either the quantum-mechanical (QM) wave packet approach or a quantum field theoretic (QFT) treatment. We compare these two approaches to neutrino oscillations and discuss the correspondence between them. In particular, we derive expressions for the QM neutrino wave packets from QFT and relate the free parameters of the QM framework, in particular the effective momentum uncertainty of the neutrino state, to the more fundamental parameters of the QFT approach. We include in our discussion the possibilities that some of the neutrino's interaction partners are not detected, that the neutrino is produced in the decay of an unstable parent particle, and that the overlap of the wave packets of the particles involved in the neutrino production (or detection) process is not maximal. Finally, we demonstrate how the properly normalized oscillation probabilities can be obtained in the QFT framework without an ad hoc normalization procedure employed in the QM approach.
C1 [Akhmedov, Evgeny Kh.; Kopp, Joachim] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany.
[Akhmedov, Evgeny Kh.] Natl Res Ctr, Kurchatov Inst, Moscow, Russia.
[Kopp, Joachim] Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA.
RP Akhmedov, EK (reprint author), Max Planck Inst Kernphys, Postfach 103980, D-69029 Heidelberg, Germany.
EM akhmedov@mpi-hd.mpg.de; jkopp@fnal.gov
RI Kopp, Joachim/B-5866-2013
FU US Department of Energy [DE-AC02-07CH11359]
FX The authors are grateful to Fedor Bezrukov and Alexei Smirnov for very
useful discussions. Fermilab is operated by Fermi Research Alliance, LLC
under Contract No. DE-AC02-07CH11359 with the US Department of Energy.
NR 33
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PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 008
DI 10.1007/JHEP04(2010)008
PG 41
WC Physics, Particles & Fields
SC Physics
GA 593PZ
UT WOS:000277473100062
ER
PT J
AU Bustamante, M
Gago, AM
Pena-Garay, C
AF Bustamante, M.
Gago, A. M.
Pena-Garay, C.
TI Energy-independent new physics in the flavour ratios of high-energy
astrophysical neutrinos
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE Beyond Standard Model; Neutrino Physics; Discrete and Finite Symmetries
ID OSCILLATIONS
AB We have studied the consequences of breaking the CPT symmetry in the neutrino sector, using the expected high-energy neutrino flux from distant cosmological sources such as active galaxies. For this purpose we have assumed three different hypotheses for the neutrino production model, characterised by the flavour fluxes at production phi(0)(e) : phi(0)(mu) : phi(0)(tau) = 1 : 2 : 0, 0 : 1 : 0, and 1 : 0 : 0, and studied the theoretical and experimental expectations for the muon-neutrino flux at Earth, phi(mu), and for the flavour ratios at Earth, R = phi(mu)/phi(e) and S = phi(tau)/phi(mu). CPT violation (CPTV) has been implemented by adding an energy-independent term to the standard neutrino oscillation Hamiltonian. This introduces three new mixing angles, two new eigenvalues and three new phases, all of which have currently unknown values. We have varied the new mixing angles and eigenvalues within certain bounds, together with the parameters associated to pure standard oscillations. Our results indicate that, for the models 1 : 2 : 0 and 0 : 1 : 0, it might be possible to find large deviations of phi(mu), R, and S between the cases without and with CPTV, provided the CPTV eigenvalues lie within 10(-29) - 10(-27) GeV, or above. Moreover, if CPTV exists, there are certain values of R and S that can be accounted for by up to three production models. If no CPTV were observed, we could set limits on the CPTV eigenvalues of the same order. Detection prospects calculated using IceCube suggest that for the models 1 : 2 : 0 and 0 : 1 : 0, the modifications due to CPTV are larger and more clearly separable from the standard-oscillations predictions. We conclude that IceCube is potentially able to detect CPTV but that, depending on the values of the CPTV parameters, there could be a mis-determination of the neutrino production model.
C1 [Bustamante, M.; Gago, A. M.] Univ Catolica Peru, Secc Fis, Dept Ciencias, Lima, Peru.
[Bustamante, M.] Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA.
[Pena-Garay, C.] CSIC UVEG, Inst Fis Corpuscular, Ctr Mixto, Valencia 46071, Spain.
RP Bustamante, M (reprint author), Univ Catolica Peru, Secc Fis, Dept Ciencias, Apartado 1761, Lima, Peru.
EM mbustamante@pucp.edu.pe; agago@pucp.edu.pe; carlos.penya@ific.uv.es
OI Bustamante, Mauricio/0000-0001-6923-0865
FU Direccion Academica de Investigacion of the Pontificia Universidad
Catolica del Peru [DAI-4075, DAI-L009]; High Energy
Latinamerican-European Network
FX This work was supported by grants from the Direccion Academica de
Investigacion of the Pontificia Universidad Catolica del Peru (projects
DAI-4075 and DAI-L009 [LUCET]) and by a High Energy
Latinamerican-European Network (HELEN) STT grant. MB acknowledges the
hospitality of IFIC during the development of this work.
NR 49
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PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 066
DI 10.1007/JHEP04(2010)066
PG 28
WC Physics, Particles & Fields
SC Physics
GA 593PZ
UT WOS:000277473100004
ER
PT J
AU Davoudiasl, H
Perez, G
AF Davoudiasl, Hooman
Perez, Gilad
TI The INTEGRAL/SPI 511 keV signal from hidden valleys in type Ia and core
collapse supernova explosions
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE Cosmology of Theories beyond the SM; Technicolor and Composite Models
ID POSITRON-ANNIHILATION RADIATION; E(+)E(-) COLLISIONS; DARK-MATTER;
ENERGY; DIMENSIONS; EMISSION; BARYOGENESIS; NEUTRINOS; COLLIDERS; PHOTON
AB We examine under what circumstances the INTEGRAL/SPI 511 keV signal can originate from decays of MeV-scale composite states produced by: (A) thermonuclear (type Ia) or (B) core collapse supernovae (SNe). The requisite dynamical properties that would account for the observed data are quite distinct, for cases (A) and (B). We determine these requirements in simple hidden valley models, where the escape fraction problem is naturally addressed, due to the long lifetime of the new composite states. A novel feature of scenario (A) is that the dynamics of type Ia SNe, standard candles for cosmological measurements, might be affected by our mechanism. In case (A), the mass of the state mediating between the hidden sector and the SM e(+)e(-) could be a few hundred GeV and within the reach of a 500GeV e(+)e(-) linear collider. We also note that kinetic mixing of the photon with a light vector state may provide an interesting alternate mediation mechanism in this case. Scenarios based on case (B) are challenged by the need for a mechanism to transport some of the produced positrons toward the Galactic bulge, due to the inferred distribution of core collapse sources. The mass of the mediator in case (B) is typically hundreds of TeV, leading to long-lived particles that could, under certain circumstances, include a viable dark matter candidate. The appearance of long-lived particles in typical models leads to cosmological constraints and we address how a consistent cosmic history may be achieved.
C1 [Davoudiasl, Hooman] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
[Perez, Gilad] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel.
RP Davoudiasl, H (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
EM hooman@bnl.gov; Gilad.Perez@weizmann.ac.il
FU United States Department of Energy [DE-AC02-98CH10886]; Israel Science
Foundation [1087/09]; EU; IRG; Peter & Patricia Gruber Award
FX We thank M. Strassler for many helpful early discussions, collaboration
on topics that led to this project, and comments on a draft version of
the present paper. We also thank K. Blum, A. Gal-Yam, U. Karshon, C.
Lunardini and T. McElmurry for conversations and comments. The work of
H. D. is supported by the United States Department of Energy under Grant
Contract DE-AC02-98CH10886. G. P. is supported by the Israel Science
Foundation ( grant # 1087/09), EU-FP7 Marie Curie, IRG fellowship and
the Peter & Patricia Gruber Award.
NR 41
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U1 0
U2 0
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 058
DI 10.1007/JHEP04(2010)058
PG 16
WC Physics, Particles & Fields
SC Physics
GA 593PZ
UT WOS:000277473100012
ER
PT J
AU Dobrescu, BA
Lykken, JD
AF Dobrescu, Bogdan A.
Lykken, Joseph D.
TI Semileptonic decays of the standard Higgs boson
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE Higgs Physics; Standard Model
ID PHYSICS; LHC
AB The Higgs boson decay into a pair of real or virtual W bosons, with one of them decaying leptonically, is predicted within the Standard Model to have the largest branching fraction of all Higgs decays that involve an isolated electron or muon, for M-h > 120GeV. We compute analytically the fully-differential width for this h(0) -> lvjj decay at tree level, and then explore some multi-dimensional cuts that preserve the region of large signal. Future searches for semileptonic decays at the Tevatron and LHC, employing fully-differential information as outlined here, may be essential for ruling out or in the Higgs boson and for characterizing a Higgs signal.
C1 [Dobrescu, Bogdan A.; Lykken, Joseph D.] Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA.
RP Dobrescu, BA (reprint author), Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA.
EM bdob@fnal.gov; lykken@fnal.gov
FU United States Department of Energy [DE-AC02-07CH11359]
FX We would like to thank Alvaro De Rujula, Estia Eichten, Patrick Fox, Tao
Han, Robert Harr, Maurizio Pierini, Chris Rogan, Maria Spiropulu, Zack
Sullivan, and especially Jan Winter for stimulating discussions.
Fermilab is operated by Fermi Research Alliance, LLC, under Contract
DE-AC02- 07CH11359 with the United States Department of Energy.
NR 23
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PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 083
DI 10.1007/JHEP04(2010)083
PG 15
WC Physics, Particles & Fields
SC Physics
GA 593PP
UT WOS:000277471900047
ER
PT J
AU Gallicchio, J
Mahbubani, R
AF Gallicchio, Jason
Mahbubani, Rakhi
TI Inflation on the brane with vanishing gravity
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE Large Extra Dimensions; Field Theories in Higher Dimensions; Cosmology
of Theories beyond the SM
ID MASS-SPECTRUM; COSMOLOGY; DYNAMICS; SUPERGRAVITY; DIMENSIONS; FLATNESS;
UNIVERSE; HORIZON; SPACE
AB Many existing models of brane inflation suffer from a steep irreducible gravitational potential between the branes that causes inflation to end too early. Inspired by the fact that point masses in 2+1 D exert no gravitational force, we propose a novel unwarped and non-supersymmetric setup for inflation, consisting of 3-branes in two extra dimensions compactified on a sphere. The size of the sphere is stabilized by a combination of a bulk cosmological constant and a magnetic flux. Computing the 4D effective potential between probe branes in this background, we find a non-zero contribution only from exchange of level-1 KK modes of the graviton and radion. For antipodal pairs of branes the contribution from these modes is absent; we can thus eliminate entirely the troublesome gravitational contribution to the inflationary potential.
C1 [Gallicchio, Jason] Harvard Univ, Jefferson Phys Lab, Cambridge, MA 02138 USA.
[Mahbubani, Rakhi] CERN, Div Theory, CH-1211 Geneva 23, Switzerland.
[Mahbubani, Rakhi] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
RP Gallicchio, J (reprint author), Harvard Univ, Jefferson Phys Lab, Cambridge, MA 02138 USA.
EM jason@physics.harvard.edu; rakhi@cern.ch
NR 36
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U2 0
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 068
DI 10.1007/JHEP04(2010)068
PG 19
WC Physics, Particles & Fields
SC Physics
GA 593PZ
UT WOS:000277473100002
ER
PT J
AU Konar, P
Kong, K
Matchev, KT
Park, M
AF Konar, Partha
Kong, Kyoungchul
Matchev, Konstantin T.
Park, Myeonghun
TI Dark matter particle spectroscopy at the LHC: generalizing M-T2 to
asymmetric event topologies
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE Supersymmetry Phenomenology
ID UNIVERSAL EXTRA DIMENSIONS; HADRON COLLIDERS; MASS DETERMINATION;
SUPERSYMMETRY; PARITY; MODEL; SPIN
AB We consider SUSY-like missing energy events at hadron colliders and critically examine the common assumption that the missing energy is the result of two identical missing particles. In order to experimentally test this hypothesis, we generalize the subsystem M-T2 variable to the case of asymmetric event topologies, where the two SUSY decay chains terminate in different "children" particles. In this more general approach, the endpoint M-T2(max) of the M-T2 distribution now gives the mass (M) over tildep((M) over tilde ((a))(c),(M) over tilde ((b))(c)) of the parent particles as a function of two input children masses (M) over tilde ((a))(c) and (M) over tilde ((b))(c) . We propose two methods for an independent determination of the individual children masses M-c((a)) and M-c((b)). (M) over tildep((M) over tilde ((a))(c),(M) over tilde ((b))(c)) . As we show in several examples, quite often there is a special point along that ridge which marks the true values of the children masses. Our results allow collider experiments to probe a multi-component dark matter sector directly and without any theoretical prejudice.
C1 [Konar, Partha; Matchev, Konstantin T.; Park, Myeonghun] Univ Florida, Dept Phys, Gainesville, FL 32611 USA.
[Kong, Kyoungchul] SLAC, Dept Theoret Phys, Menlo Pk, CA 94025 USA.
RP Konar, P (reprint author), Univ Florida, Dept Phys, Gainesville, FL 32611 USA.
EM konar@phys.ufl.edu; kckong@slac.stanford.edu; matchev@phys.ufl.edu;
ishaed@phys.ufl.edu
OI Konar, Partha/0000-0001-8796-1688
FU US Department of Energy [DE-FG02-97ER41029]; DOE [DE-AC02-76SF00515]
FX We are grateful to A. J. Barr, B. Gripaios, C. G. Lester, and L. Pape
for their insightful and stimulating comments. All authors would like to
thank the Fermilab Theoretical Physics Department for warm hospitality
and support at various stages during the completion of this work. This
work is supported in part by a US Department of Energy grant
DE-FG02-97ER41029. KK is supported in part by the DOE under contract
DE-AC02-76SF00515.
NR 115
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PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 086
DI 10.1007/JHEP04(2010)086
PG 50
WC Physics, Particles & Fields
SC Physics
GA 593PP
UT WOS:000277471900044
ER
PT J
AU Kong, K
Park, SC
Rizzo, TG
AF Kong, Kyoungchul
Park, Seong Chan
Rizzo, Thomas G.
TI Collider phenomenology with Split-UED
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE Phenomenology of Large extra dimensions; Phenomenology of Field Theories
in Higher Dimensions
ID DIMENSIONS; HIERARCHY; PARTICLE
AB We investigate the collider implications of Split Universal Extra Dimensions. The non-vanishing fermion mass in the bulk, which is consistent with the KK-parity, largely modifies the phenomenology of Minimal Universal Exta Dimensions. We scrutinize the behavior of couplings and study the discovery reach of the Tevatron and the LHC for level-2 Kaluza-Klein modes in the dilepton channel, which would indicates the presence of the extra dimensions. Observation of large event rates for dilepton resonances can result from a nontrivial fermion mass profile along the extra dimensions, which, in turn, may corroborate an extra dimensional explanation for the observation of the positron excess in cosmic rays.
C1 [Kong, Kyoungchul; Rizzo, Thomas G.] SLAC, Dept Theoret Phys, Menlo Pk, CA 94025 USA.
[Park, Seong Chan] Univ Tokyo, Inst Phys & Math Universe, Chiba 2778568, Japan.
RP Kong, K (reprint author), SLAC, Dept Theoret Phys, Menlo Pk, CA 94025 USA.
EM kckong@slac.stanford.edu; seongchan.park@ipmu.jp;
rizzo@slac.stanford.edu
FU World Premier International Research Center Initiative (WPI initiative);
MEXT; JSPS [21740172]; DOE [DE-AC02-76SF00515]
FX We thank J. Shu and K. Wang for discussions on the forward-backward
asymmetry and also thank C. Csaki, J. Heinonen and J. Hubisz for helpful
discussion. S. Park is supported by the World Premier International
Research Center Initiative (WPI initiative) by MEXT and also supported
by the Grant-in-Aid for scientific research (Young Scientists (B)
21740172) from JSPS, Japan. K. Kong and T. G. Rizzo are supported in
part by the DOE under contract DE-AC02-76SF00515.
NR 34
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U2 2
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 081
DI 10.1007/JHEP04(2010)081
PG 23
WC Physics, Particles & Fields
SC Physics
GA 593PP
UT WOS:000277471900049
ER
PT J
AU Lai, HL
Huston, J
Mrenna, S
Nadolsky, PM
Stump, D
Tung, WK
Yuan, CP
AF Lai, Hung-Liang
Huston, Joey
Mrenna, Stephen
Nadolsky, Pavel M.
Stump, Daniel
Tung, Wu-Ki
Yuan, C. -P.
TI Parton distributions for event generators
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE QCD Phenomenology
AB In this paper, conventional global QCD analysis is generalized to produce parton distribution functions (PDFs) optimized for use with event generators at the Large Hadron Collider (LHC). This optimization is accomplished by complementing usual constraints on the PDFs from the existing hard-scattering experimental data with those needed to reproduce cross sections for key scattering processes at the LHC, as predicted by the best available theory, in the joint input to the global analysis. With the optimized PDFs, predictions obtained by event generators at a given order in the QCD coupling strength reproduce the representative LHC cross sections computed at one higher order. In the present study, the optimized PDFs for leading-order event generators were developed. Several optimization strategies and resulting candidate PDF sets (labeled as CT09MCS, CT09MC1 and CT09MC2) are compared with those from other approaches.
C1 [Lai, Hung-Liang] Taipei Municipal Univ Educ, Taipei, Taiwan.
[Huston, Joey; Stump, Daniel; Tung, Wu-Ki; Yuan, C. -P.] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA.
[Mrenna, Stephen] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Nadolsky, Pavel M.] So Methodist Univ, Dept Phys, Dallas, TX 75275 USA.
[Tung, Wu-Ki] Univ Washington, Dept Phys, Seattle, WA 98105 USA.
RP Lai, HL (reprint author), Taipei Municipal Univ Educ, Taipei, Taiwan.
EM laihungl@gmail.com; huston@msu.edu; mrenna@fnal.gov;
nadolsky@physics.smu.edu; pumplin@pa.msu.edu; stump@pa.msu.edu;
yuan@pa.msu.edu
OI Mrenna, Stephen/0000-0001-8731-160X
FU U.S. Department of Energy [DE-FG02-04ER41299]; Fermilab Research
Alliance, LLC [DE-AC02-76CH11359]; United States Department of Energy;
U.S. National Science Foundation [PHY-0555545, PHY-0855561, PHY-0757758,
PHY-0705862]; National Science Council of Taiwan
[NSC-98-2112-M-133-002-MY3]; Lightner-Sams Foundation
FX We would like to thank Albert de Roeck, Hannes Jung, Judith Katzy, Peter
Skands, Torbjorn Sjostrand, Markus Warzinsky, and participants of the
PDF4LHC meetings for useful discussions. This work was supported in part
by the U.S. Department of Energy under grant DE-FG02-04ER41299; by the
Fermilab Research Alliance, LLC, under Contract DE-AC02-76CH11359 with
the United States Department of Energy; by the U.S. National Science
Foundation under grant numbers PHY-0555545, PHY-0855561, and
PHY-0757758; by the National Science Council of Taiwan under grant No.
NSC-98-2112-M-133-002-MY3; by LHC Theory Initiative Travel Fellowship
awarded by the U.S. National Science Foundation under grant PHY-0705862;
and by Lightner-Sams Foundation. C.-P. Y. would also like to thank the
hospitality of National Center for Theoretical Sciences in Taiwan and
Center for High Energy Physics, Peking University, in China, where part
of this work was done.
NR 20
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U2 1
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 035
DI 10.1007/JHEP04(2010)035
PG 29
WC Physics, Particles & Fields
SC Physics
GA 593PZ
UT WOS:000277473100035
ER
PT J
AU Low, I
Rattazzi, R
Vichi, A
AF Low, Ian
Rattazzi, Riccardo
Vichi, Alessandro
TI Theoretical constraints on the Higgs effective couplings
SO JOURNAL OF HIGH ENERGY PHYSICS
LA English
DT Article
DE Higgs Physics; Beyond Standard Model; Technicolor and Composite Models
ID ELECTROWEAK SYMMETRY-BREAKING; PHENOMENOLOGICAL LAGRANGIANS; BOSON
PRODUCTION; MODEL; PHYSICS; LHC
AB We derive constraints on the sign of couplings in an effective Higgs Lagrangian using prime principles such as the naturalness principle, global symmetries, and unitarity. Specifically, we study four dimension-six operators, O-H, O-y, O-g, and O-gamma, which contribute to the production and decay of the Higgs boson at the Large Hadron Collider (LHC), among other things. Assuming the Higgs is a fundamental scalar, we find: 1) the coefficient of O-H is positive except when there are triplet scalars, resulting in a reduction in the Higgs on-shell coupling from their standard model (SM) expectations if no other operators contribute, 2) the linear combination of O-H and O-y controlling the overall Higgs coupling to fermion is always reduced, 3) the sign of O-g induced by a new colored fermion is such that it interferes destructively with the SM top contribution in the gluon fusion production of the Higgs, if the new fermion cancels the top quadratic divergence in the Higgs mass, and 4) the correlation between naturalness and the sign of O-gamma is similar to that of O-g, when there is a new set of heavy electroweak gauge bosons. Next considering a composite scalar for the Higgs, we find the reduction in the on-shell Higgs couplings persists. If further assuming a collective breaking mechanism as in little Higgs theories, the coefficient of O-H remains positive even in the presence of triplet scalars. In the end, we conclude that the gluon fusion production of the Higgs boson is reduced from the SM rate in all composite Higgs models. Our study suggests a wealth of information could be revealed by precise measurements of the Higgs couplings, providing strong motivations for both improving on measurements at the LHC and building a precision machine such as the linear collider.
C1 [Low, Ian] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA.
[Low, Ian] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA.
[Rattazzi, Riccardo; Vichi, Alessandro] Ecole Polytech Fed Lausanne, Inst Theorie Phenomenes Phys, CH-1015 Lausanne, Switzerland.
RP Low, I (reprint author), Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA.
EM ilow@anl.gov; riccardo.rattazzi@epfl.ch; alessandro.vichi@epfl.ch
OI Rattazzi, Riccardo/0000-0003-0276-017X
FU U.S. Department of Energy [DE-AC02-06CH11357]; Swiss National Science
Foundation [200021-116372]
FX This work is supported in part by the U.S. Department of Energy under
grant DE-AC02-06CH11357 and by the Swiss National Science Foundation
under contract No. 200021-116372. We acknowledge the hospitality of
theory groups at CERN, EPFL Lausanne, and Northwestern University during
the completion of this work. I. L. also acknowledges the hospitality of
the Aspen Center for Physics where part of this work was completed.
NR 58
TC 77
Z9 77
U1 1
U2 1
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1029-8479
J9 J HIGH ENERGY PHYS
JI J. High Energy Phys.
PD APR
PY 2010
IS 4
AR 126
DI 10.1007/JHEP04(2010)126
PG 40
WC Physics, Particles & Fields
SC Physics
GA 593PP
UT WOS:000277471900006
ER
PT J
AU Yu, Q
Sharma, A
Sen, J
AF Yu, Qing
Sharma, Archna
Sen, Jyoti
TI T Cell Factor-1 Initiates T Helper 2 Fate by Inducing GATA-3 and
Repressing IFNgamma
SO JOURNAL OF IMMUNOLOGY
LA English
DT Meeting Abstract
C1 [Yu, Qing; Sharma, Archna; Sen, Jyoti] NIA, Immunol Lab, NIH, Baltimore, MD 21224 USA.
[Yu, Qing] ORAU ORISE, Oak Ridge, TN USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER ASSOC IMMUNOLOGISTS
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA
SN 0022-1767
EI 1550-6606
J9 J IMMUNOL
JI J. Immunol.
PD APR 1
PY 2010
VL 184
SU 1
MA 99.8
PG 1
WC Immunology
SC Immunology
GA V44OM
UT WOS:000209758303024
ER
PT J
AU Fessing, MY
Gdula, MR
Mardaryev, AN
Sharov, AA
Sharova, TY
Gordon, KB
Kohwi-Shigematsu, T
Botchkarev, VA
AF Fessing, M. Y.
Gdula, M. R.
Mardaryev, A. N.
Sharov, A. A.
Sharova, T. Y.
Gordon, K. B.
Kohwi-Shigematsu, T.
Botchkarev, V. A.
TI Genome organiser and special AT-rich binding protein Satb1 controls the
establishing tissue-specific chromatin organization during development
of the epidermis
SO JOURNAL OF INVESTIGATIVE DERMATOLOGY
LA English
DT Meeting Abstract
CT Annual Meeting of the Society-for-Investigative-Dermatology
CY MAY 05-08, 2010
CL Atlanta, GA
SP Soc Investigat Dermatol
C1 [Fessing, M. Y.; Gdula, M. R.; Mardaryev, A. N.; Gordon, K. B.; Botchkarev, V. A.] Univ Bradford, Ctr Skin Sci, Bradford BD7 1DP, W Yorkshire, England.
[Sharov, A. A.; Sharova, T. Y.; Botchkarev, V. A.] Boston Univ, Boston, MA 02215 USA.
[Kohwi-Shigematsu, T.] Lawrence Berkeley Natl Lab, Berkeley, CA USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU NATURE PUBLISHING GROUP
PI NEW YORK
PA 75 VARICK ST, 9TH FLR, NEW YORK, NY 10013-1917 USA
SN 0022-202X
J9 J INVEST DERMATOL
JI J. Invest. Dermatol.
PD APR
PY 2010
VL 130
SU 1
MA 634
BP S106
EP S106
PG 1
WC Dermatology
SC Dermatology
GA 580ND
UT WOS:000276455100633
ER
PT J
AU Manson, JL
Schlueter, JA
McDonald, RD
Singleton, J
AF Manson, J. L.
Schlueter, J. A.
McDonald, R. D.
Singleton, J.
TI Crystal Structure and Antiferromagnetic Ordering of Quasi-2D
[Cu(HF2)(pyz)(2)]TaF6 (pyz=pyrazine)
SO JOURNAL OF LOW TEMPERATURE PHYSICS
LA English
DT Article; Proceedings Paper
CT 9th International Conference on Research in High Magnetic Fields (RHMF
2009)
CY JUL 22-25, 2009
CL Dresden, GERMANY
SP Hist Ctr Dresden
DE Antiferromagnet; Low-dimensional
AB The crystal structure of the title compound was determined by X-ray diffraction at 90 and 295 K. Copper(II) ions are coordinated to four bridging pyz ligands to form square layers in the ab-plane. Bridging HF2- ligands join the layers together along the c-axis to afford a tetragonal, three-dimensional (3D) framework that contains TaF6- anions in every cavity. At 295 K, the pyz rings lie exactly perpendicular to the layers and cooling to 90 K induces a canting of those rings. Magnetically, the compound exhibits 2D antiferromagnetic correlations within the 2D layers with an exchange interaction of -13.1(1) K. Weak interlayer interactions, as mediated by Cu-F-H-F-Cu, leads to long-range magnetic order below 4.2 K. Pulsed-field magnetization data at 0.5 K show a concave curvature with increasing B and reveal a saturation magnetization at 35.4 T.
C1 [Manson, J. L.] Eastern Washington Univ, Dept Chem & Biochem, Cheney, WA 99037 USA.
[Schlueter, J. A.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[McDonald, R. D.; Singleton, J.] Los Alamos Natl Lab, MPA NHMFL, Los Alamos, NM 87545 USA.
RP Manson, JL (reprint author), Eastern Washington Univ, Dept Chem & Biochem, Cheney, WA 99037 USA.
EM jmanson@ewu.edu
RI McDonald, Ross/H-3783-2013;
OI McDonald, Ross/0000-0002-0188-1087; Mcdonald, Ross/0000-0002-5819-4739
NR 7
TC 7
Z9 7
U1 0
U2 4
PU SPRINGER/PLENUM PUBLISHERS
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0022-2291
J9 J LOW TEMP PHYS
JI J. Low Temp. Phys.
PD APR
PY 2010
VL 159
IS 1-2
BP 15
EP 19
DI 10.1007/s10909-009-0079-5
PG 5
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 567AT
UT WOS:000275415400005
ER
PT J
AU Cizmar, E
Ozerov, M
Skourski, Y
Zvyagin, SA
Schlueter, JA
Manson, JL
Wosnitza, J
AF Cizmar, E.
Ozerov, M.
Skourski, Y.
Zvyagin, S. A.
Schlueter, J. A.
Manson, J. L.
Wosnitza, J.
TI High-Field Magnetization Study of [Cu(pyz)(2)(HF2)]PF6: An S=1/2
Quasi-two-dimensional Heisenberg Magnet
SO JOURNAL OF LOW TEMPERATURE PHYSICS
LA English
DT Article; Proceedings Paper
CT 9th International Conference on Research in High Magnetic Fields (RHMF
2009)
CY JUL 22-25, 2009
CL Dresden, GERMANY
SP Hist Ctr Dresden
DE Two-dimensional; Pulsed magnetic field; Magnetization
ID SQUARE LATTICE; ANTIFERROMAGNETS; METASTABILITY
AB We report on pulsed-field magnetization studies of the quasi-two-dimensional spin system [Cu(pyz)(2)(HF2)]PF6. The magnetization saturates at B-C(ab) = 37.5 T and B-C(c) = 33.8 T for in-plane and out-of-plane orientations of the applied magnetic field, respectively. In addition, the angular dependence of the g-factor studied by electron-spin resonance reveals orbital overlap in the ab plane suggesting a quasi-two-dimensional square-lattice network of Cu spins. It is argued that the high-field behavior is governed by the two-dimensional nature of the spin correlations due to the large anisotropy of the exchange couplings.
C1 [Cizmar, E.; Ozerov, M.; Skourski, Y.; Zvyagin, S. A.; Wosnitza, J.] FZ Dresden Rossendorf, Dresden High Magnet Field Lab, D-01314 Dresden, Germany.
[Cizmar, E.] Safarik Univ, Ctr Low Temp Phys, Kosice 04154, Slovakia.
[Cizmar, E.] IEP SAS, Kosice 04154, Slovakia.
[Schlueter, J. A.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Manson, J. L.] Eastern Washington Univ, Dept Chem & Biochem, Cheney, WA 99004 USA.
RP Cizmar, E (reprint author), FZ Dresden Rossendorf, Dresden High Magnet Field Lab, D-01314 Dresden, Germany.
EM erik.cizmar@upjs.sk
RI Zvyagin, Sergei/H-8389-2014; Cizmar, Erik/R-9171-2016
OI Cizmar, Erik/0000-0001-6289-110X
NR 13
TC 0
Z9 0
U1 0
U2 7
PU SPRINGER/PLENUM PUBLISHERS
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0022-2291
J9 J LOW TEMP PHYS
JI J. Low Temp. Phys.
PD APR
PY 2010
VL 159
IS 1-2
BP 92
EP 95
DI 10.1007/s10909-009-0093-7
PG 4
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 567AT
UT WOS:000275415400023
ER
PT J
AU Gomez, V
Kappen, HJ
Chertkov, M
AF Gomez, Vicenc
Kappen, Hilbert J.
Chertkov, Michael
TI Approximate Inference on Planar Graphs using Loop Calculus and Belief
Propagation
SO JOURNAL OF MACHINE LEARNING RESEARCH
LA English
DT Article
DE belief propagation; loop calculus; approximate inference; partition
function; planar graphs; Ising model
ID STATISTICAL-MECHANICS; LATTICE; DIMERS; MODELS
AB We introduce novel results for approximate inference on planar graphical models using the loop calculus framework. The loop calculus (Chertkov and Chernyak, 2006a) allows to express the exact partition function of a graphical model as a finite sum of terms that can be evaluated once the belief propagation (BP) solution is known. In general, full summation over all correction terms is intractable. We develop an algorithm for the approach presented in Chertkov et al. (2008) which represents an efficient truncation scheme on planar graphs and a new representation of the series in terms of Pfaffians of matrices. We analyze the performance of the algorithm for models with binary variables and pairwise interactions on grids and other planar graphs. We study in detail both the loop series and the equivalent Pfaffian series and show that the first term of the Pfaffian series for the general, intractable planar model, can provide very accurate approximations. The algorithm outperforms previous truncation schemes of the loop series and is competitive with other state of the art methods for approximate inference.
C1 [Gomez, Vicenc; Kappen, Hilbert J.] Radboud Univ Nijmegen, Dept Biophys, NL-6525 EZ Nijmegen, Netherlands.
[Chertkov, Michael] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Chertkov, Michael] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA.
RP Gomez, V (reprint author), Radboud Univ Nijmegen, Dept Biophys, NL-6525 EZ Nijmegen, Netherlands.
EM V.GOMEZ@SCIENCE.RU.NL; B.KAPPEN@SCIENCE.RU.NL; CHERTKOV@LANL.GOV
RI Kappen, Hilbert/D-1921-2010; Kappen, H.J./L-4425-2015; Chertkov,
Michael/O-8828-2015; Gomez, Vicenc/D-1984-2009
OI Gomez, Vicenc/0000-0001-5146-7645
FU Dutch Ministry of Economic Affairs [BSIK03024]; U.S. Department of
Energy at LANL [DE-AC52-06NA25396]
FX We acknowledge J. M. Mooij, A. Windsor and A. Globerson for providing
their software, V. Y. Chernyak, J. K. Johnson and N. Schraudolph for
interesting discussions and anonymous reviewers for valuable
suggestions. This research is part of the Interactive Collaborative
Information Systems (ICIS) project, supported by the Dutch Ministry of
Economic Affairs, grant BSIK03024. The work at LANL was carried out
under the auspices of the National Nuclear Security Administration of
the U.S. Department of Energy at LANL under Contract No.
DE-AC52-06NA25396.
NR 30
TC 8
Z9 8
U1 0
U2 0
PU MICROTOME PUBL
PI BROOKLINE
PA 31 GIBBS ST, BROOKLINE, MA 02446 USA
SN 1532-4435
J9 J MACH LEARN RES
JI J. Mach. Learn. Res.
PD APR
PY 2010
VL 11
BP 1273
EP 1296
PG 24
WC Automation & Control Systems; Computer Science, Artificial Intelligence
SC Automation & Control Systems; Computer Science
GA 658VZ
UT WOS:000282521500003
ER
PT J
AU Wang, RL
Wang, GJ
Goldstein, RZ
Caparelli, EC
Volkow, ND
Fowler, JS
Tomasi, D
AF Wang, Ruiliang
Wang, Gene-Jack
Goldstein, Rita Z.
Caparelli, Elisabeth C.
Volkow, Nora D.
Fowler, Joanna S.
Tomasi, Dardo
TI Induced Magnetic Force in Human Heads Exposed to 4 T MRI
SO JOURNAL OF MAGNETIC RESONANCE IMAGING
LA English
DT Article
DE magnetic resonance imaging; magnetic gradient field; induced magnetic
force; MRI safety; phase mapping; ROI analysis; susceptibility-weighted
MR pulse sequence
ID PHASE REFERENCE; FIELD; VERTIGO; BRAIN; TASTE; TESLA
AB Purpose: To map the distribution of the magnetic force induced in the human head during magnetic resonance imaging (MRI) at 4 T for a large group of healthy volunteers.
Materials and Methods: The magnetic field distribution in the head of 100 men and 18 women was mapped using phase mapping techniques. Statistical parametric mapping methods using a family-wise error (EWE) corrected threshold P < 0.05 and region-of-interest analyses were used to assess the significance of the results.
Results: Eyeballs, orbitofrontal and temporal cortices, subcallosal gyrus, anterior cingulate, midbrain, and brain-stem (pons) are the brain regions most susceptible to magnetic force. The strength of the magnetic force density in the head was lower than 11.5 +/- 5.3 N/m(3) (right eyeball). The strength of the magnetic force density induced in occipital cortex varied linearly with the x-rotation (pitch) angle.
Conclusion: We found that the induced magnetic force is highly significant in the eyeballs, orbitofrontal and temporal cortices. subcallosal gyrus, anterior cingulate as well as midbrain and brainstem (pons), regardless of subjects' age or gender. The maximum induced magnetic force was 6 x 10(5) times weaker than the gravitational force: thus. biological effects of the magnetic force during imaging are not expected to be significant.
C1 [Wang, Ruiliang; Wang, Gene-Jack; Goldstein, Rita Z.; Caparelli, Elisabeth C.; Fowler, Joanna S.; Tomasi, Dardo] Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA.
[Caparelli, Elisabeth C.] SUNY Stony Brook, SCAN Ctr, Stony Brook, NY 11794 USA.
[Volkow, Nora D.; Tomasi, Dardo] NIAAA, Bethesda, MD USA.
[Volkow, Nora D.] NIDA, Bethesda, MD 20892 USA.
RP Wang, RL (reprint author), Brookhaven Natl Lab, Dept Med, Bldg 555A, Upton, NY 11973 USA.
EM rlwang@bnl.gov
RI Tomasi, Dardo/J-2127-2015
FU Intramural NIH HHS [ZIA AA000550-06]
NR 23
TC 2
Z9 2
U1 0
U2 3
PU JOHN WILEY & SONS INC
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN, NJ 07030 USA
SN 1053-1807
J9 J MAGN RESON IMAGING
JI J. Magn. Reson. Imaging
PD APR
PY 2010
VL 31
IS 4
BP 815
EP 820
DI 10.1002/jmri.22125
PG 6
WC Radiology, Nuclear Medicine & Medical Imaging
SC Radiology, Nuclear Medicine & Medical Imaging
GA 578WU
UT WOS:000276328200005
PM 20373424
ER
PT J
AU Ferrari, L
Matteucci, G
Schofield, MA
Beleggia, M
Zhu, YM
AF Ferrari, Loris
Matteucci, Giorgio
Schofield, Marvin A.
Beleggia, Marco
Zhu, Yimei
TI Near-Curie magnetic anomaly at the Ni/C interface observed by electron
holography
SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
LA English
DT Article
DE Electron holography; Curie temperature; Nickel film; Surface anisotropy;
Spin-reorientation transition
ID PERPENDICULAR ANISOTROPY; NICKEL; TRANSITION; FILMS
AB We analyze with electron holography carried out in a transmission electron microscope the near-Curie behavior of magnetism at the edge of a Nickel thin film coated with Carbon. In-situ experiments with finely controlled variations of the sample temperature reveal an anomaly in the ferromagnetic to paramagnetic phase transition when the film temperature is a few degrees above the nominal Curie point. We interpret the anomaly as a strain-induced spin reorientation transition triggered by the differential thermal expansion of Carbon and Nickel. We present a model that quantitatively reproduces the main features of the observed signal. The model is developed in terms of ananisotropic, temperature dependent exchange coupling between the Nickel moments at the Carbon interface that favors their vertical alignment at low temperatures. (C) 2009 Elseviern B.V. All rights reserved.
C1 [Ferrari, Loris; Matteucci, Giorgio] Univ Bologna, Dept Phys, I-40127 Bologna, Italy.
[Schofield, Marvin A.; Beleggia, Marco; Zhu, Yimei] Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Beleggia, M (reprint author), Tech Univ Denmark, Ctr Electron Nanoscopy, DK-2800 Lyngby, Denmark.
EM mb@cen.dtu.dk
OI Beleggia, Marco/0000-0002-2888-1888
FU US Department of Energy, Basic Energy Sciences [DE-AC02-98CH10886]
FX We gratefully acknowledge F. Boscherini and L. Pasquini for additional
X-ray analysis of our samples, and L. Del Bianco for simulating
discussions. Financial support was provided by the US Department of
Energy, Basic Energy Sciences, under contract no. DE-AC02-98CH10886.
NR 28
TC 1
Z9 1
U1 0
U2 3
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0304-8853
J9 J MAGN MAGN MATER
JI J. Magn. Magn. Mater.
PD APR
PY 2010
VL 322
IS 7
BP 858
EP 865
DI 10.1016/j.jmmm.2009.11.017
PG 8
WC Materials Science, Multidisciplinary; Physics, Condensed Matter
SC Materials Science; Physics
GA 544QC
UT WOS:000273672700020
ER
PT J
AU Han, WQ
Su, D
Murphy, M
Ward, M
Sham, TK
Wu, LJ
Zhu, YM
Hu, YF
Aoki, T
AF Han, Wei-Qiang
Su, Dong
Murphy, Michael
Ward, Matthew
Sham, Tsun-Kong
Wu, Lijun
Zhu, Yimei
Hu, Yongfeng
Aoki, Toshihiro
TI Microstructure and electronic behavior of PtPd@Pt core-shell nanowires
SO JOURNAL OF MATERIALS RESEARCH
LA English
DT Article
ID ABSORPTION FINE-STRUCTURE; OXYGEN-REDUCTION; X-RAY; METAL
NANOSTRUCTURES; SURFACE SEGREGATION; MAGNETIC-PROPERTIES; POROUS
SILICON; PD; NANOPARTICLES; PLATINUM
AB PtPd@Pt core-shell ultrathin nanowires were prepared using a one-step phase-transfer approach. The diameters of the nanowires range from 2 to 3 nm, and their lengths are up to hundreds of nanometers. Line scanning electron energy loss spectra showed that PtPd bimetallic nanowires have a core-shell structure, with a PtPd alloy core and a Pt monolayer shell. X-ray absorption near edge structure (XANES) spectra reveal that a strong Pt-Pd interaction exists in this nanowire system in that there is PtPd alloying and/or interfacial interaction. Extended x-ray absorption fine structures (EXAFS) further confirms the PtPd@Pt core-shell structure. The bimetallic nanowires were determined to be face-centered cubic structures. The long-chain organic molecules of n-dodecyl trimethylammonium bromide and octadecylamine, used as surfactants during synthesis, were clearly observed using aberration-corrected TEM operated at 80 KV. The interaction of Pt and surfactants was also revealed by EXAFS.
C1 [Han, Wei-Qiang; Su, Dong] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
[Murphy, Michael; Ward, Matthew; Sham, Tsun-Kong] Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada.
[Wu, Lijun; Zhu, Yimei] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
[Hu, Yongfeng] Univ Saskatchewan, Canadian Light Source, Saskatoon, SK S7N 0X4, Canada.
[Aoki, Toshihiro] JEOL USA Inc, Peabody, MA 01961 USA.
RP Han, WQ (reprint author), Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
EM whan@bnl.gov
RI Han, WQ/E-2818-2013; Aoki, Toshihiro/I-4852-2015; Su, Dong/A-8233-2013
OI Su, Dong/0000-0002-1921-6683
FU U.S. DOE [DE-AC02-98CH10886, DE-AC02-06CH11357]; NSERC; NRC; CIHR;
University of Saskatchewan; CRC; CFI; OIT
FX This work is supported by the U.S. DOE under Contract DE-AC02-98CH10886.
Research at APS was supported by the U.S. DOE, under Contract
DE-AC02-06CH11357. C.L.S. is supported by NSERC, NRC, CIHR, and
University of Saskatchewan. Work at UWO is supported by NSERC, CRC, CFI,
and OIT.
NR 36
TC 4
Z9 4
U1 6
U2 37
PU MATERIALS RESEARCH SOC
PI WARRENDALE
PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA
SN 0884-2914
J9 J MATER RES
JI J. Mater. Res.
PD APR
PY 2010
VL 25
IS 4
BP 711
EP 717
DI 10.1557/JMR.2010.0090
PG 7
WC Materials Science, Multidisciplinary
SC Materials Science
GA 578GW
UT WOS:000276282600016
ER
PT J
AU McDonald, JP
Rodriguez, MA
Jones, ED
Adams, DP
AF McDonald, Joel P.
Rodriguez, Mark A.
Jones, Eric D., Jr.
Adams, David P.
TI Rare-earth transition-metal intermetallic compounds produced via
self-propagating, high-temperature synthesis
SO JOURNAL OF MATERIALS RESEARCH
LA English
DT Article
ID REACTIVE MULTILAYER FOILS; COMBUSTION SYNTHESIS; MECHANICAL-PROPERTIES;
FRACTURE-TOUGHNESS; PHASE-EQUILIBRIA; SCANDIUM; HEAT; YAG; YTTRIUM;
SYSTEM
AB Several binary intermetallic compounds-each containing a rare-earth (RE) element paired with a transition metal (TM)-were prepared by self-propagating, high-temperature synthesis (SHS). Thin multilayers, composed of alternating Sc or Y (RE element) and Ag, Cu, or Au (TM), were first deposited by direct current magnetron sputtering. Once the initially distinct layers were stimulated and caused to mix, exothermic reactions propagated to completion. X-ray diffraction revealed that Sc/Au, Sc/Cu, Y/Au, and Y/Cu multilayers react in vacuum to form single-phase, cubic B2 structures. Multi layers containing Ag and a RE metal formed cubic B2 (RE)Ag and a minority (RE)Ag-2 phase. The influence of an oxygen-containing environment on the reaction dynamics and the formation of phase were investigated, providing evidence for the participation of secondary combustion reactions during metal-metal SHS. High-speed photography demonstrated reaction propagation speeds that ranged from 0.1-40.0 m/s (dependent on material system and foil design). Both steady and spin-like reaction modes were observed.
C1 [McDonald, Joel P.; Rodriguez, Mark A.; Jones, Eric D., Jr.; Adams, David P.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP McDonald, JP (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM jpmcdon@sandia.gov
FU Laboratory Directed Research and Development grant at Sandia National
Laboratories; U.S. Department of Energy's National Nuclear Security
Administration [DE-AC04-94AL85000]
FX We gratefully acknowledge funding for this work obtained through a
Laboratory Directed Research and Development grant at Sandia National
Laboratories. In addition, we thank W. Wallace for Auger electron
spectroscopy and analysis. Sandia is a multiprogram laboratory operated
by Sandia Corporation, a Lockheed Martin Company, for the U.S.
Department of Energy's National Nuclear Security Administration under
Contract No. DE-AC04-94AL85000.
NR 61
TC 14
Z9 14
U1 0
U2 5
PU CAMBRIDGE UNIV PRESS
PI NEW YORK
PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA
SN 0884-2914
EI 2044-5326
J9 J MATER RES
JI J. Mater. Res.
PD APR
PY 2010
VL 25
IS 4
BP 718
EP 727
DI 10.1557/JMR.2010.0091
PG 10
WC Materials Science, Multidisciplinary
SC Materials Science
GA 578GW
UT WOS:000276282600017
ER
PT J
AU Boyle, TJ
Lambert, TN
Pratt, HD
Lu, P
Griego, JJM
Bush, N
Chavez, CA
Welk, M
AF Boyle, Timothy J.
Lambert, Timothy N.
Pratt, Harry D., III
Lu, Ping
Griego, James J. M.
Bush, Nancy
Chavez, Carlos A.
Welk, Margaret
TI Morphological and phase dependence of nanotitania materials generated
under extreme pH conditions for large scale production of TiO2 nanowires
(basic) and nanosquares or nanrods (acidic)
SO JOURNAL OF MATERIALS SCIENCE
LA English
DT Article
ID LOW-TEMPERATURE SYNTHESIS; PHOTOCATALYTIC ACTIVITY; HYDROTHERMAL
SYNTHESIS; TITANATE NANOTUBES; CRYSTAL-GROWTH; METAL-OXIDES;
NANOPARTICLES; ANATASE; NANOMATERIALS; SHAPE
AB The effect that the phase of the starting nanoseed titania (TiO2), the pH of the solvent solution, and the processing methodology employed have on the properties of the resultant TiO2 nanomaterials were explored. This led to the development of a new process to produce large-scale, phase pure, thin nanowires of TiO2 at high pH and nanosquares at low pH. Anatase, rutile, and Degussa P25(TM) TiO2 nanoparticle starting materials (or nanoseeds) were processed in strongly basic (10 M KOH) and strongly acidic (conc. HX, where X = Cl, Br, I) solutions using solvothermal (SOLVO) and solution precipitation (SPPT) methodologies. Under basic SOLVO conditions, the nanoseeds were converted to H2Ti2O5 center dot H2O nanowires. The SPPT basic conditions also produced the same phased nanowires for the rutile and anatase nanoseeds, while the Degussa nanomaterial yielded mixed phased [anatase:rutile (9:1)] nanowires. The SPPT method was found to produce substantially thinner nanowires in comparison to the SOLVO route, with comparable surface areas but the strong basic media led to etching of the glassware yielding HK3Ti4O4(SiO4)(3)center dot 4H(2)O nanorods. Hybridization of these two processing routes led to the use of Nalgene(TM) bottle as the reaction flask termed the hybrid (HYBR) route, yielding even thinner H2Ti2O5 center dot H2O nanowires on a large-scale. Switching to a concentrated halide acid (HX, where X = Cl, Br, I) system, SOLVO, SPPT, and HYBR routes were investigated. The resultant TEM images revealed that the rutile starting material yielded short rods, whereas the anatase seeds formed square or faceted materials.
C1 [Boyle, Timothy J.; Pratt, Harry D., III; Griego, James J. M.; Bush, Nancy] Sandia Natl Labs, Adv Mat Lab, Albuquerque, NM 87106 USA.
[Lambert, Timothy N.; Chavez, Carlos A.] Sandia Natl Labs, Dept Mat Devices & Energy Technol, Albuquerque, NM 87185 USA.
[Lu, Ping] Sandia Natl Labs, Dept Mat Characterizat, Albuquerque, NM 87185 USA.
[Welk, Margaret] Sandia Natl Labs, Dept Fuels & Energy Transit, Albuquerque, NM 87185 USA.
RP Boyle, TJ (reprint author), Sandia Natl Labs, Adv Mat Lab, 1001 Univ Blvd SE, Albuquerque, NM 87106 USA.
EM tjboyle@Sandia.gov
FU U.S. Department of Energy, Office of Basic Energy Science, Division of
Material Sciences and Engineering [DE-AC04-94AL85000]; Sandia National
Laboratories
FX For support of this research, the authors thank the U.S. Department of
Energy, Office of Basic Energy Science, Division of Material Sciences
and Engineering and the Laboratory Directed Research and Development
(LDRD) program at Sandia National Laboratories. Sandia is a multiprogram
laboratory operated by Sandia Corporation, a Lockheed Martin Company,
for the United States Department of Energy's National Nuclear Security
Administration under Contract DE-AC04-94AL85000.
NR 55
TC 5
Z9 5
U1 2
U2 23
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0022-2461
EI 1573-4803
J9 J MATER SCI
JI J. Mater. Sci.
PD APR
PY 2010
VL 45
IS 7
BP 1744
EP 1759
DI 10.1007/s10853-009-4148-6
PG 16
WC Materials Science, Multidisciplinary
SC Materials Science
GA 550AA
UT WOS:000274096400005
ER
PT J
AU Kane, SR
Ashby, PD
Pruitt, LA
AF Kane, Sheryl R.
Ashby, Paul D.
Pruitt, Lisa A.
TI Microscale wear behavior and crosslinking of PEG-like coatings for total
hip replacements
SO JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
LA English
DT Article
ID MOLECULAR-WEIGHT POLYETHYLENE; TOTAL JOINT REPLACEMENTS; PERIPROSTHETIC
OSTEOLYSIS; ARTICULAR-CARTILAGE; POLYMER; DEBRIS; ARTHROPLASTY;
HYDROGELS
AB The predominant cause of late-state failure of total hip replacements is wear-mediated osteolysis caused by wear particles that originate from the ultrahigh molecular weight polyethylene (UHMWPE) acetabular cup surface. One strategy for reducing wear particle formation from UHMWPE is to modify the surface with a hydrophilic coating to increase lubrication from synovial fluid. This study focuses on the wear behavior of hydrophilic coatings similar to poly(ethylene glycol) (PEG). The coatings were produced by plasma-polymerizing tetraglyme on UHMWPE in a chamber heated to 40A degrees C or 50A degrees C. Both temperatures yielded coatings with PEG-like chemistry and increased hydrophilicity relative to uncoated UHMWPE; however, the 40A degrees C coatings were significantly more resistant to damage induced by atomic force microscopy nanoscratching. The 40A degrees C coatings exhibited only one damage mode (delamination) and often showed no signs of damage after repeated scratching. In contrast, the 50A degrees C coatings exhibited three damage modes (roughening, thinning, and delamination), and always showed visible signs of damage after no more than two scratches. The greater wear resistance of the 40A degrees C coatings could not be explained by coating chemistry or hydrophilicity, but it corresponded to an approximately 26-32% greater degree of crosslinking relative to the 50A degrees C surfaces, suggesting that crosslinking should be a significant design consideration for hydrophilic coatings used for total hip replacements and other wear-dependent applications.
C1 [Kane, Sheryl R.; Pruitt, Lisa A.] UC San Francisco, Joint Grad Grp Bioengn, Berkeley, CA 94720 USA.
[Kane, Sheryl R.; Pruitt, Lisa A.] UC Berkeley, Berkeley, CA 94720 USA.
[Ashby, Paul D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Pruitt, LA (reprint author), UC San Francisco, Joint Grad Grp Bioengn, 5134 Etcheverry Hall,MC 1740, Berkeley, CA 94720 USA.
EM lpruitt@me.berkeley.edu
FU NSF [CMS 0505272]; UCSF; American Association of University Women; U. S.
Department of Energy [DE-AC02-05CH11231]; NIH [EB-002027]
FX This work was supported by the NSF (grant # CMS 0505272 and a Graduate
Research Fellowship), a Sigma Xi Grant-in-Aid of Research, a UCSF
Graduate Student Research Award, and the American Association of
University Women. AFM work at the Molecular Foundry was supported by the
Director, Office of Science, Office of Basic Energy Sciences, Division
of Materials Science and Engineering, of the U. S. Department of Energy
under Contract # DE-AC02-05CH11231. XPS was performed at the University
of Washington NESAC/BIO facility, supported by NIH grant # EB-002027. In
addition, the authors would like to acknowledge Kyriakos Komvopoulos for
his tribology expertise, Stephanie Uhlich and Amy Walters for their
contributions to the contact angle experiments, and Stephen Kaplan and
4th State Inc. for assistance with and use of their plasma equipment.
NR 20
TC 2
Z9 2
U1 1
U2 9
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0957-4530
J9 J MATER SCI-MATER M
JI J. Mater. Sci.-Mater. Med.
PD APR
PY 2010
VL 21
IS 4
BP 1037
EP 1045
DI 10.1007/s10856-009-3935-6
PG 9
WC Engineering, Biomedical; Materials Science, Biomaterials
SC Engineering; Materials Science
GA 578EF
UT WOS:000276275600001
PM 20091104
ER
PT J
AU Wataha, JC
Hobbs, DT
Wong, JJ
Dogan, S
Zhang, H
Chung, KH
Elvington, MC
AF Wataha, John C.
Hobbs, David T.
Wong, Jacqueline J.
Dogan, Sami
Zhang, Hai
Chung, K. -H.
Elvington, Mark C.
TI Titanates deliver metal ions to human monocytes
SO JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
LA English
DT Article
AB Amorphous peroxotitantes (APT) are insoluble titanium-based particles that bind a variety of metal compounds with high affinity; these particles could be sequestered locally in a solid phase to deliver metal-based drugs. Previous studies have confirmed the 'biodelivery' of metals from metal-APT complexes to fibroblasts, but not monocytes. Our goal in the current study was to use monocytic cytokine secretion to assess delivery of gold or platinum-based compounds from APT to human THP1 monocytes. Cytokine secretion was not triggered by APT alone or metal-APT complexes. In monocytes activated by lipopolysaccharide (LPS), APT alone enhanced or suppressed IL1 beta or IL6 secretion, yet TNF alpha secretion was unaffected. Complexes of APT and Au(III) or cis-platin altered LPS-activated IL6 or IL1 beta secretion most, TNF alpha least. Our results suggest that the APT deliver metals to monocytes.
C1 [Wataha, John C.; Wong, Jacqueline J.; Dogan, Sami; Zhang, Hai; Chung, K. -H.] Univ Washington, Sch Dent, Dept Restorat Dent, Seattle, WA 98197 USA.
[Hobbs, David T.; Elvington, Mark C.] Savannah River Nucl Solut LLC, Savannah River Natl Lab, Aiken, SC USA.
RP Wataha, JC (reprint author), Univ Washington, Sch Dent, Dept Restorat Dent, D770 Hlth Sci Bldg,1959 NE Pacific St,Box 357456, Seattle, WA 98197 USA.
EM jwataha@gmail.com
FU University of Washington; Savannah River National Laboratory LDRD
FX The authors thank the University of Washington and the Savannah River
National Laboratory LDRD Program for their support of our work. The
authors also sincerely thank Ms. Petra Lockwood for her excellent
technical help with the assays.
NR 11
TC 9
Z9 9
U1 0
U2 3
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0957-4530
J9 J MATER SCI-MATER M
JI J. Mater. Sci.-Mater. Med.
PD APR
PY 2010
VL 21
IS 4
BP 1289
EP 1295
DI 10.1007/s10856-009-3941-8
PG 7
WC Engineering, Biomedical; Materials Science, Biomaterials
SC Engineering; Materials Science
GA 578EF
UT WOS:000276275600028
PM 19941042
ER
PT J
AU Wu, JW
Liu, XB
AF Wu, Junwei
Liu, Xingbo
TI Recent Development of SOFC Metallic Interconnect
SO JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
LA English
DT Review
DE Solid oxide fuel cells (SOFC); Interconnect; Spinel; Coating
ID OXIDE FUEL-CELLS; FERRITIC STAINLESS-STEEL; CHROMIUM-CONTAINING ALLOY;
MN-CO ALLOYS; OXIDATION RESISTANCE; THERMAL-EXPANSION;
ELECTRICAL-CONDUCTIVITY; SPINEL COATINGS; BASE ALLOYS; TEMPERATURE
AB Interest in solid oxide fuel cells (SOFC) stems from their higher efficiencies and lower levels of emitted pollutants, compared to traditional power production methods. Interconnects are a critical part in SOFC stacks, which connect cells in series electrically, and also separate air-or oxygen at the cathode side from fuel at the anode side. Therefore, the requirements of interconnects are the most demanding, i.e., to maintain high electrical conductivity, good stability in both reducing and oxidizing atmospheres, and close coefficient of thermal expansion (CTE) match and good compatibility with other SOFC ceramic components. The paper reviewed the interconnect materials, and coatings for metallic interconnect materials.
C1 [Wu, Junwei; Liu, Xingbo] W Virginia Univ, Dept Mech & Aerosp Engn, Morgantown, WV 26506 USA.
[Wu, Junwei; Liu, Xingbo] Natl Energy Technol Lab, Morgantown, WV 26507 USA.
[Wu, Junwei] Univ Town, Dept Mat Sci & Engn, Shenzhen Grad Sch, Harbin Inst Technol, Shenzhen 518055, Peoples R China.
RP Liu, XB (reprint author), W Virginia Univ, Dept Mech & Aerosp Engn, Morgantown, WV 26506 USA.
EM xingbo.liu@mail.wvu.edu
FU RDS [DE-AC26- 04NT41817]
FX This technical effort was performed in support of the National Energy
Technology Laboratory's on-going research in solid oxide fuel cell Under
the RDS contract DE-AC26- 04NT41817. The authors appreciate technical
contributions from Drs. Christopher Johnson, Randall Gemmen, and Kirk
Gerdes at NETL.
NR 71
TC 93
Z9 100
U1 10
U2 97
PU JOURNAL MATER SCI TECHNOL
PI SHENYANG
PA 72 WENHUA RD, SHENYANG 110015, PEOPLES R CHINA
SN 1005-0302
J9 J MATER SCI TECHNOL
JI J. Mater. Sci. Technol.
PD APR
PY 2010
VL 26
IS 4
BP 293
EP 305
PG 13
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 596PT
UT WOS:000277698000002
ER
PT J
AU Williams, JD
Sun, P
Sweatt, WC
Ellis, AR
AF Williams, John D.
Sun, Po
Sweatt, William C.
Ellis, A. R.
TI Metallic-tilted woodpile photonic crystals in the midinfrared
SO JOURNAL OF MICRO-NANOLITHOGRAPHY MEMS AND MOEMS
LA English
DT Article
DE 3-D photonic crystal; photonic bandgap; wood pile; tilted wood pile
ID BAND-GAPS; TEMPLATES
AB We demonstrate a large area production of 3-D woodpile metallic photonic crystals using deep x-ray lithography and subsequent electroforming. These structures represent the (110) orientation of the (001) woodpile structures most commonly presented in the literature. This approach requires no alignment and is capable of generating a 3 unit cell thick photonic crystal in a simple three step process flow. Tilted woodpiles demonstrate band characteristics very similar to those observed from (001) woodpiles. Reflectivity tests show a band edge around 4 mu m and good comparison well with numerical simulations. (C) 2010 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3427162]
C1 [Williams, John D.; Sun, Po] Univ Alabama, Dept Elect & Comp Engn, Huntsville, AL 35899 USA.
[Sweatt, William C.; Ellis, A. R.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Williams, JD (reprint author), Univ Alabama, Dept Elect & Comp Engn, Huntsville, AL 35899 USA.
EM williams@eng.uah.edu
FU United States Department of Energy [DEAC04-94AL 85000]; Office of the
Vice President of Research for UAHuntsville
FX The authors would like to thank the Center for Advanced Microstructures
and Devices (CAMD) at Louisiana State University, and especially
Zhong-Geng Ling for his work exposing these structures. Device
fabrication and testing was completed under Williams at Sandia National
Laboratories, a multiprogram laboratory operated by Sandia Corporation,
a Lockheed Martin Company, for the United States Department of Energy
under contract DEAC04-94AL 85000. Modeling and simulation were completed
at UAHuntsville and funded by the Office of the Vice President of
Research for UAHuntsville.
NR 17
TC 4
Z9 4
U1 0
U2 4
PU SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA
SN 1932-5150
J9 J MICRO-NANOLITH MEM
JI J. Micro-Nanolithogr. MEMS MOEMS
PD APR-JUN
PY 2010
VL 9
IS 2
AR 023011
DI 10.1117/1.3427162
PG 4
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology;
Materials Science, Multidisciplinary; Optics
SC Engineering; Science & Technology - Other Topics; Materials Science;
Optics
GA 629TK
UT WOS:000280222400012
ER
PT J
AU James, CD
McClain, J
Pohl, KR
Reuel, N
Achyuthan, KE
Bourdon, CJ
Rahimian, K
Galambos, PC
Ludwig, G
Derzon, MS
AF James, Conrad D.
McClain, Jaime
Pohl, Kenneth R.
Reuel, Nigel
Achyuthan, Komandoor E.
Bourdon, Christopher J.
Rahimian, Kamyar
Galambos, Paul C.
Ludwig, George
Derzon, Mark S.
TI High-efficiency magnetic particle focusing using dielectrophoresis and
magnetophoresis in a microfluidic device
SO JOURNAL OF MICROMECHANICS AND MICROENGINEERING
LA English
DT Article
ID PATHOGEN DETECTION; ON-CHIP; SEPARATION; INSTRUMENTS; SIMULANTS;
CHANNELS; AGENTS; ELISA; FOOD
AB We describe a novel technique that utilizes simultaneous implementation of dielectrophoresis (DEP) and magnetophoresis (MAP) to focus magnetic particles into streams for optical analysis of biological samples. This technique does not require sheath flow and utilizes a novel interdigitated electrode array chip that yields multiple streams of flowing magnetic particles in single-file columns. The MAP force placed particles in close proximity to the microelectrodes where they were subjected to a strong DEP force that generated the particle focusing effect. Particle focusing efficiency was improved using this combination DEP-MAP technique compared to DEP alone: particle stream widths were reduced similar to 47% and stream width variability was reduced 80% for focused streams of 8.5 mu m diameter magnetic particles. 3 mu m diameter magnetic particles were strongly focused with DEP-MAP (similar to 4 mu m wide streams with sub-mu m variability in stream width) while DEP alone provided minimal focusing. Additional components of a prototype detection system were also demonstrated including an integrated magnetic pelleting component, a hand-held MHz frequency signal generator and a bench-top near-confocal microscope for optical analysis of flowing particles. Preliminary testing of a sandwich assay performed on the surface of magnetic particles showed 50 ppb detection levels of a surrogate biotoxin (ovalbumin) in a raw milk sample.
C1 [James, Conrad D.; McClain, Jaime; Pohl, Kenneth R.; Achyuthan, Komandoor E.; Bourdon, Christopher J.; Rahimian, Kamyar; Galambos, Paul C.; Derzon, Mark S.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Reuel, Nigel] MIT, Cambridge, MA 02139 USA.
[Ludwig, George] USA, Med Res & Mat Command, Frederick, MD 21702 USA.
RP James, CD (reprint author), Sandia Natl Labs, Albuquerque, NM 87185 USA.
EM cdjame@sandia.gov
FU United States Department of Energy [DE-AC04-94AL85000]
FX The authors thank Vickie Peck, Matthew Hopkins, James Cullor and Paul
Rossitto for useful discussions, and Darin Graf, Cody Washburn, Patty
Sawyer and John Anderson for device fabrication and experimental
support. This work was funded by Sandia's Laboratory Directed Research
and Development program. Sandia National Laboratories is a multiprogram
laboratory operated by Sandia Corporation, a Lockheed Martin Company,
for the United States Department of Energy under contract
DE-AC04-94AL85000.
NR 32
TC 16
Z9 16
U1 2
U2 14
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0960-1317
J9 J MICROMECH MICROENG
JI J. Micromech. Microeng.
PD APR
PY 2010
VL 20
IS 4
AR 045015
DI 10.1088/0960-1317/20/4/045015
PG 9
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology;
Instruments & Instrumentation; Physics, Applied
SC Engineering; Science & Technology - Other Topics; Instruments &
Instrumentation; Physics
GA 572OG
UT WOS:000275841800016
ER
PT J
AU Saraf, LV
AF Saraf, Laxmikant V.
TI Site-specific Pt deposition and etching on electrically and thermally
isolated SiO2 micro-disk surfaces
SO JOURNAL OF MICROMECHANICS AND MICROENGINEERING
LA English
DT Article
ID BEAM INDUCED DEPOSITION; ELECTROPOLISHING SILICON; ION; FABRICATION;
PLATINUM; SENSOR
AB Electrically and thermally isolated surfaces are crucial for improving the detection sensitivity of microelectronic sensors. The site-specific in situ growth of Pt nano-rods on thermally and electrically isolated SiO2 micro-disks using wet chemical etching and a focused ion/electron dual beam (FIB-SEM) is demonstrated. Fabrication of an array of micro-cavities on top of a micro-disk is also demonstrated. The FIB source is utilized to fabricate through-holes in the micro-disks. Due to the amorphous nature of SiO2 micro-disks, the Ga implantation possibly modifies through-hole sidewall surface chemistry rather than affecting its transport properties. Some sensor design concepts based on micro-fabrication of SiO2 micro-disks utilizing thermally and electrically isolated surfaces are discussed from the viewpoint of applications in photonics and bio-sensing.
C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA.
RP Saraf, LV (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA.
NR 25
TC 2
Z9 2
U1 1
U2 8
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0960-1317
J9 J MICROMECH MICROENG
JI J. Micromech. Microeng.
PD APR
PY 2010
VL 20
IS 4
AR 045031
DI 10.1088/0960-1317/20/4/045031
PG 6
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology;
Instruments & Instrumentation; Physics, Applied
SC Engineering; Science & Technology - Other Topics; Instruments &
Instrumentation; Physics
GA 572OG
UT WOS:000275841800032
ER
PT J
AU Hause, ML
Hall, GE
Sears, TJ
AF Hause, Michael L.
Hall, Gregory E.
Sears, Trevor J.
TI Sub-Doppler laser absorption spectroscopy of the A(2)Pi <- X-2 Sigma(+)
(1, 0) band of CN: Measurement of the N-14 hyperfine parameters in
A(2)Pi CN (vol 253, pg 122, 2009)
SO JOURNAL OF MOLECULAR SPECTROSCOPY
LA English
DT Correction
C1 [Hause, Michael L.; Hall, Gregory E.; Sears, Trevor J.] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
RP Sears, TJ (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
EM gehall@bnl.gov; sears@bnl.gov
RI Hall, Gregory/D-4883-2013; Sears, Trevor/B-5990-2013
OI Hall, Gregory/0000-0002-8534-9783; Sears, Trevor/0000-0002-5559-0154
NR 3
TC 2
Z9 2
U1 1
U2 2
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0022-2852
J9 J MOL SPECTROSC
JI J. Mol. Spectrosc.
PD APR
PY 2010
VL 260
IS 2
BP 138
EP 138
DI 10.1016/j.jms.2010.01.005
PG 1
WC Physics, Atomic, Molecular & Chemical; Spectroscopy
SC Physics; Spectroscopy
GA 587IH
UT WOS:000276983600009
ER
PT J
AU Xiao, Z
Camino, FE
AF Xiao, Z.
Camino, F. E.
TI An Effective Switching-Off Mechanism for High-Performance Carbon
Nanotube Field-Effect Transistors
SO JOURNAL OF NANOELECTRONICS AND OPTOELECTRONICS
LA English
DT Article
DE Single-Walled Carbon Nanotubes (SWCNTs); Carbon Nanotube Field-Effect
Transistors (CNTFETs); Junction Field-Effect Transistors (JFETs)
ID ALIGNED ARRAYS; SINGLE; ELECTRONICS; NETWORKS; SENSORS
AB We report an effective switching-off mechanism for the fabrication of high-performance carbon nanotube field-effect transistors (CNTFETs) formed by ultra-purified single-walled carbon nano-tubes (SWCNTs) with p-type Sb(2)Te(3) semiconductor as the source and drain contact material and a narrow platinum gate entirely defined inside the source and drain contact region. CNTFETs show drain-source current (I(Ds)) as a function of drain-source voltage (V(DS)) and gate voltage (V(GS)) of similar characteristics to a p-channel junction field-effect transistor (JFET). CNTFETs are normally on, and they can be effectively switched off with applying a positive gate voltage. By localizing the gate action primarily on the SWCNTs, away from the source and drain contacts, we could clearly interpret the beneficial effect of semiconducting contacts on the performance of CNTFETs. The proposed device is novel and could be a solution to the switching-off problem in CNTFETs.
C1 [Xiao, Z.] Alabama A&M Univ, Dept Elect Engn, Normal, AL 35762 USA.
[Camino, F. E.] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
RP Xiao, Z (reprint author), Alabama A&M Univ, Dept Elect Engn, Normal, AL 35762 USA.
FU U.S. Department of Energy, Office of Basic Energy Sciences
[DE-AC02-98CH10886]; National Security Agency [H98230-07-1-0113];
National Science Foundation [EPS-0814103]
FX Research carried out in part at the Center for Functional Nanomaterials,
Brookhaven National Laboratory, which is supported by the U.S.
Department of Energy, Office of Basic Energy Sciences, under Contract
No. DE-AC02-98CH10886; The research is supported by National Security
Agency under Grant No. H98230-07-1-0113 and National Science Foundation
under Grant No. EPS-0814103.
NR 20
TC 1
Z9 1
U1 0
U2 6
PU AMER SCIENTIFIC PUBLISHERS
PI STEVENSON RANCH
PA 25650 NORTH LEWIS WAY, STEVENSON RANCH, CA 91381-1439 USA
SN 1555-130X
J9 J NANOELECTRON OPTOE
JI J. Nanoelectron. Optoelectron.
PD APR
PY 2010
VL 5
IS 1
BP 26
EP 29
DI 10.1166/jno.2010.1058
PG 4
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology;
Physics, Applied
SC Engineering; Science & Technology - Other Topics; Physics
GA 631QH
UT WOS:000280362200004
ER
PT J
AU Armstead, WM
Ganguly, K
Kiessling, JW
Riley, J
Chen, XH
Smith, DH
Stein, SC
Higazi, AAR
Cines, DB
Bdeir, K
Zaitsev, S
Muzykantov, VR
AF Armstead, William M.
Ganguly, Kumkum
Kiessling, J. W.
Riley, John
Chen, Xiao-Han
Smith, Douglas H.
Stein, Sherman C.
Higazi, Abd A. R.
Cines, Douglas B.
Bdeir, Khalil
Zaitsev, Sergei
Muzykantov, Vladimir R.
TI Signaling, delivery and age as emerging issues in the benefit/risk ratio
outcome of tPA For treatment of CNS ischemic disorders
SO JOURNAL OF NEUROCHEMISTRY
LA English
DT Review
DE cerebral ischemia; neurovascular unit; pediatric; signaling; stroke;
tissue plasminogen activator
ID TISSUE-PLASMINOGEN ACTIVATOR; BLOOD-BRAIN-BARRIER; FOCAL
CEREBRAL-ISCHEMIA; RECEPTOR-RELATED PROTEIN; ARTERY OCCLUSION; ERK MAPK;
PROPHYLACTIC FIBRINOLYSIS; NMDA CEREBROVASODILATION; DEPENDENT
IMPAIRMENT; NEUROVASCULAR UNIT
AB Stroke is a leading cause of morbidity and mortality. While tissue-type plasminogen activator (tPA) remains the only FDA-approved treatment for ischemic stroke, clinical use of tPA has been constrained to roughly 3% of eligible patients because of the danger of intracranial hemorrhage and a narrow 3 h time window for safe administration. Basic science studies indicate that tPA enhances excitotoxic neuronal cell death. In this review, the beneficial and deleterious effects of tPA in ischemic brain are discussed along with emphasis on development of new approaches toward treatment of patients with acute ischemic stroke. In particular, roles of tPA-induced signaling and a novel delivery system for tPA administration based on tPA coupling to carrier red blood cells will be considered as therapeutic modalities for increasing tPA benefit/risk ratio. The concept of the neurovascular unit will be discussed in the context of dynamic relationships between tPA-induced changes in cerebral hemodynamics and histopathologic outcome of CNS ischemia. Additionally, the role of age will be considered since thrombolytic therapy is being increasingly used in the pediatric population, but there are few basic science studies of CNS injury in pediatric animals.
C1 [Armstead, William M.; Kiessling, J. W.; Riley, John] Univ Penn, Dept Anesthesiol & Crit Care, Philadelphia, PA 19104 USA.
[Armstead, William M.; Zaitsev, Sergei; Muzykantov, Vladimir R.] Univ Penn, Dept Pharmacol, Philadelphia, PA 19104 USA.
[Ganguly, Kumkum] Los Alamos Natl Lab, Biosci Div, Los Alamos, NM USA.
[Chen, Xiao-Han; Smith, Douglas H.; Stein, Sherman C.] Univ Penn, Dept Neurosurg, Philadelphia, PA 19104 USA.
[Higazi, Abd A. R.; Cines, Douglas B.; Bdeir, Khalil] Univ Penn, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA.
[Higazi, Abd A. R.] Hadassah Univ Hosp, Dept Clin Biochem, IL-91120 Jerusalem, Israel.
[Higazi, Abd A. R.] Hebrew Univ Jerusalem, Hadassah Med Sch, IL-91010 Jerusalem, Israel.
[Zaitsev, Sergei; Muzykantov, Vladimir R.] Univ Penn, Inst Environm Med, Philadelphia, PA 19104 USA.
[Muzykantov, Vladimir R.] Univ Penn, Inst Translat Med & Therapeut, Philadelphia, PA 19104 USA.
RP Armstead, WM (reprint author), Univ Penn, Dept Anesthesiol & Crit Care, 3620 Hamilton Walk,JM3, Philadelphia, PA 19104 USA.
EM armsteaw@uphs.upenn.edu
RI smith, douglas/A-1321-2007
FU National Institutes of Health [NS53410, HD57355, HL76406, CA83121,
HL76206, HL07971, HL81864, HL77760, HL82545, HL66442, HL090697];
University of Pennsylvania Research Foundation; University of
Pennsylvania Institute for Translational Medicine and Therapeutics;
Israeli Science Foundation
FX There are no declared conflicts of interest. This research was supported
by grants from the National Institutes of Health, NS53410 and HD57355
(WMA), HL76406, CA83121, HL76206, HL07971, and HL81864 (DBC), HL77760
and HL82545 (AARH), HL66442 and HL090697 (VRM), the University of
Pennsylvania Research Foundation (WMA and VRM), the University of
Pennsylvania Institute for Translational Medicine and Therapeutics
(DBC), and the Israeli Science Foundation (AARH).
NR 86
TC 20
Z9 22
U1 0
U2 6
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0022-3042
J9 J NEUROCHEM
JI J. Neurochem.
PD APR
PY 2010
VL 113
IS 2
BP 303
EP 312
DI 10.1111/j.1471-4159.2010.06613.x
PG 10
WC Biochemistry & Molecular Biology; Neurosciences
SC Biochemistry & Molecular Biology; Neurosciences & Neurology
GA 570KJ
UT WOS:000275674100002
PM 20405577
ER
PT J
AU Lamb, J
Chandra, D
Coleman, M
Sharma, A
Cathey, WN
Paglieri, SN
Wermer, JR
Bowman, RC
Lynch, FE
AF Lamb, Joshua
Chandra, Dhanesh
Coleman, Michael
Sharma, Archana
Cathey, William N.
Paglieri, Stephen N.
Wermer, Joseph R.
Bowman, Robert C., Jr.
Lynch, Franklin E.
TI Low and high-pressure hydriding of V-0.5at.%C
SO JOURNAL OF NUCLEAR MATERIALS
LA English
DT Article
ID HYDROGEN PERMEATION CHARACTERISTICS; TRITIUM EXTRACTION;
BREEDER-BLANKET; LIQUID LITHIUM; METAL-HYDRIDES; VANADIUM; PALLADIUM;
MEMBRANES; SYSTEM; DIFFUSION
AB The low-pressure hydriding characteristics of V-0.5at.%C alloy were determined in this study. There are several prior reports on the pressure-composition-temperature (p-c-T) isotherms and stability of the low-pressure vanadium hydride phases (V(2)H or beta(1)), and of vanadium alloyed with transition elements, but there are no reports on the hydrides of V-C alloys. The thermodynamic properties of the vanadium did not change significantly with the addition of carbon. In addition to low-pressure studies on V-0.5at.%C, we also performed high-pressure studies on V(2)H <-> VH <-> VH(2) (beta(1) <-> beta(2) <-> gamma) hydrides, including thermal cycling (778 cycles) between the beta and gamma phases. Thermal cycling between VH <-> VH(2) increased the pressure hysteresis. The effects of thermal cycling (4000 cycles) on the absorption and desorption isotherms of V-0.5at.%C and on the H/M ratios for the beta(1)-, beta(2)- and gamma-phase hydrides are also presented. There was minimal decrepitation (pulverization) of the alloy; decrepitation of the V-0.5at.%C alloy was dramatically less than that of pure vanadium. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Lamb, Joshua; Chandra, Dhanesh; Coleman, Michael; Sharma, Archana; Cathey, William N.] Univ Nevada, Reno, NV 89557 USA.
[Paglieri, Stephen N.] TDA Res Inc, Wheat Ridge, CO 80033 USA.
[Wermer, Joseph R.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Bowman, Robert C., Jr.] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.
[Lynch, Franklin E.] HCI, Littleton, CO 80125 USA.
RP Chandra, D (reprint author), Univ Nevada, MS 388, Reno, NV 89557 USA.
EM dchandra@unr.edu
OI Bowman, Robert/0000-0002-2114-1713
FU US DOE; Jet Propulsion Laboratory; US National Aeronautics and Space
Administration (NASA)
FX We acknowledge Dr. Wen Ming Chien for assistance with plotting some of
the figures, and Dr. Raja Chellappa, Dr. John D. Wright, and Jan Graves
for proofreading the manuscript. This work was funded in part by the US
DOE and was partially performed at the Jet Propulsion Laboratory, which
is operated by the California Institute of Technology under contract
with the US National Aeronautics and Space Administration (NASA). The
authors are also grateful for assistance by the DOE Metal Hydride Center
of Excellence.
NR 56
TC 2
Z9 2
U1 2
U2 6
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0022-3115
J9 J NUCL MATER
JI J. Nucl. Mater.
PD APR 1
PY 2010
VL 399
IS 1
BP 55
EP 61
DI 10.1016/j.jnucmat.2010.01.002
PG 7
WC Materials Science, Multidisciplinary; Nuclear Science & Technology
SC Materials Science; Nuclear Science & Technology
GA 591VR
UT WOS:000277333700007
ER
PT J
AU Fair, JM
Hanelt, B
Burnett, K
AF Fair, Jeanne M.
Hanelt, Ben
Burnett, Kassidy
TI Horsehair Worms (Gordius robustus) in Nests of the Western Bluebird
(Sialia mexicana): Evidence for Anti-Predator Avoidance?
SO JOURNAL OF PARASITOLOGY
LA English
DT Article
ID PHYLUM-NEMATOMORPHA; PREDATION; HAIRWORMS; CRICKETS
AB Hairworms (Nematomorpha: Gordiida) are internal parasites that alter the behavior of their terrestrial insect host, forcing it to enter the water to reach its reproductive habitat. After reproduction of the free-living adults, the larvae encyst in aquatic insects and are retained upon metamorphosis of the insect into an adult fly. This paratenic host links the aquatic and terrestrial environments after its consumption by omnivorous or predatory insects. Therefore, hairworms are usually only associated with invertebrates, and few reports discuss hairworm interactions with vertebrate species. Here, we report on the finding of horsehair worms in nests of a cavity-nesting bird species in Los Alamos County, New Mexico. From 2004 to 2008, 7 nests within nest boxes occupied by the western bluebird (Sialia mexicana) contained 8 hairworms that were identified as Gordius robustus. All of the nest boxes with worms were less than 100 m from stagnant or low-flowing streams. The most likely explanation for the presence of the worms in the nests is that worms engaged in anti-predator avoidance after their insect hosts were collected and before digestion by nestling birds.
C1 [Fair, Jeanne M.; Burnett, Kassidy] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Hanelt, Ben] Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA.
RP Fair, JM (reprint author), Los Alamos Natl Lab, MS M888, Los Alamos, NM 87545 USA.
EM jmfair@lanl.gov
FU Los Alamos National Security, LLC, U.S. Department of Energy
[DE-AC52-06NA25396]
FX We thank the following people for excellence in the field: C. Hathcock,
D. Keller, L. Maestas, E. Powell, R. Robinson, and S. Sherwood. We are
grateful to Orrin Myers for establishing the avian nest box monitoring
network. This research was funded by the Environmental Restoration
Program through Los Alamos National Security, LLC, operator of the Los
Alamos National Laboratory under Contract No. DE-AC52-06NA25396 with the
U.S. Department of Energy. Finally, we would like to thank two anonymous
reviewers for providing helpful comments.
NR 15
TC 3
Z9 3
U1 2
U2 13
PU AMER SOC PARASITOLOGISTS
PI LAWRENCE
PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 USA
SN 0022-3395
J9 J PARASITOL
JI J. Parasitol.
PD APR
PY 2010
VL 96
IS 2
BP 429
EP 430
DI 10.1645/GE-2313.1
PG 2
WC Parasitology
SC Parasitology
GA 610ZS
UT WOS:000278780600026
PM 19954262
ER
PT J
AU Kose, ME
Long, H
Kim, K
Graf, P
Ginley, D
AF Kose, Muhammet E.
Long, Hai
Kim, Kwiseon
Graf, Peter
Ginley, David
TI Charge Transport Simulations in Conjugated Dendrimers
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID LIGHT-EMITTING-DIODES; VIBRATIONAL REORGANIZATION ENERGY; ORGANIC
SEMICONDUCTORS; THIOPHENE DENDRIMERS; HOLE MOBILITIES; ELECTRON;
GENERATION; PARAMETERS; OLIGOMERS; RUBRENE
AB We present here a theoretical methodology that exploits quantum mechanical calculations, Molecular mechanics calculations, and Monte Carlo simulations to predict the time-of-flight measurement mobilities in films of phenyl-cored conjugated thiophene dendrimers. Our aim is to reveal structure-property relationships in amorphous films of organic pi-conjugated materials. The simulations show that both hole and electron mobilities increase with the size of dendrimer, and that the former is larger than latter in all dendrimers. Internal reorganization energies are inversely correlated with the mobilities. Our simulations also indicate that dendrimers have small density of states for energetic disorder (<60 meV), and both hole and electron mobilities possess weak electric field dependence. We examine the influence of external reorganization energy as well as the possible trap sites oil charge transport in these materials.
C1 [Kose, Muhammet E.] N Dakota State Univ, Dept Chem & Mol Biol, Fargo, ND 58108 USA.
[Long, Hai; Kim, Kwiseon; Graf, Peter; Ginley, David] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Kose, ME (reprint author), N Dakota State Univ, Dept Chem & Mol Biol, Fargo, ND 58108 USA.
EM muhammet.kose@ndsu.edu
RI Kose, Muhammet/C-7167-2012; Long, Hai/C-5838-2015
FU U.S. Department of Energy [DE-AC36-08G028308]
FX This work was supported by the U.S. Department of Energy under contract
no. DE-AC36-08G028308 with the National Renewable Energy Laboratory.
M.E.K. thanks Brian A. Gregg for his valuable discussions.
NR 41
TC 28
Z9 28
U1 0
U2 26
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1089-5639
J9 J PHYS CHEM A
JI J. Phys. Chem. A
PD APR 1
PY 2010
VL 114
IS 12
BP 4388
EP 4393
DI 10.1021/jp911051u
PG 6
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 572TH
UT WOS:000275855500045
PM 20218594
ER
PT J
AU Black, JK
Tracy, LE
Roche, CP
Henry, PJ
Pesavento, JB
Adalsteinsson, T
AF Black, Jeremy K.
Tracy, Lauren E.
Roche, Conor P.
Henry, Paul J.
Pesavento, Joseph B.
Adalsteinsson, Thorsteinn
TI Phase Transitions of Hexadecane in Poly(alkyl methacrylate) Core-Shell
Microcapsules
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID IN-WATER EMULSIONS; MINIEMULSION POLYMERIZATION; CRYSTALLIZATION
KINETICS; MEDIATED NUCLEATION; NEUTRON-SCATTERING; LIQUID DROPLETS;
SURFACE-TENSION; CALORIMETRY; SILICA; NANOCAPSULES
AB Microcapsules containing subfemtoliter Volumes of n-hexadecane (HD) within a 4-40 nm thick shell of poly(alkyl methacrylates) were prepared. The size of the HD drop was varied between 50 and 140 nm. The alkyl substituents on the methacrylate monomer were varied to alter the surface tension between the HD and the polymer shell in order to investigate the effects of surface tension on the freezing point of the HD. The size dependence of the Supercooling as predicted by the G-T equation was not observed in our systems. An effect oil the magnitude of supercooling with variation in the side chains was observed, where freezing the HD in capsules with bulkier side chains requires a greater magnitude of supercooling. This is in agreement with the increased hydrophobic character of the polymers and also correlates with the decrease in glass transition temperature of the polymer. We also observed aging of the capsules, which could be accelerated by heating.
C1 [Black, Jeremy K.; Tracy, Lauren E.; Roche, Conor P.; Henry, Paul J.; Adalsteinsson, Thorsteinn] Santa Clara Univ, Dept Chem & Biochem, Santa Clara, CA 95053 USA.
[Adalsteinsson, Thorsteinn] Santa Clara Univ, Ctr Nanostruct, Santa Clara, CA 95053 USA.
[Pesavento, Joseph B.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA.
RP Adalsteinsson, T (reprint author), Santa Clara Univ, Dept Chem & Biochem, Santa Clara, CA 95053 USA.
EM tadalsteinsson@scu.edu
FU Santa Clara University Faculty Development Office [0057]; Claire Luce
Booth [DEAN1121]
FX The authors thank Santa Clara University for financial support for this
work. J.K.B. was supported by a grant from Santa Clara University
Faculty Development Office "EIBM#0057". Lauren Tracy was supported by
The Claire Luce Booth fellowship "DEAN1121". GPC analysis of samples was
done by Polymer Laboratories Inc. Trials in using SEM to image the
capsules were done at the Center for Nanostructures at Santa Clara
University by the group members in the Adalsteinsson group. The authors
also thank Professor J. Gilbert at Santa Clara University for helpful
comments on the manuscript.
NR 36
TC 17
Z9 17
U1 0
U2 8
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1520-6106
J9 J PHYS CHEM B
JI J. Phys. Chem. B
PD APR 1
PY 2010
VL 114
IS 12
BP 4130
EP 4137
DI 10.1021/jp9080355
PG 8
WC Chemistry, Physical
SC Chemistry
GA 572TK
UT WOS:000275855800003
PM 20205375
ER
PT J
AU Liu, HB
Sale, KL
Holmes, BM
Simmons, BA
Singh, S
AF Liu, Hanbin
Sale, Kenneth L.
Holmes, Bradley M.
Simmons, Blake A.
Singh, Seema
TI Understanding the Interactions of Cellulose with Ionic Liquids: A
Molecular Dynamics Study
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID 1-N-BUTYL-3-METHYLIMIDAZOLIUM CHLORIDE; NEUTRON-DIFFRACTION;
COMPUTER-SIMULATION; ORGANIC-MOLECULES; FORCE-FIELD; BASIS-SETS;
DISSOLUTION; MODEL; PRETREATMENT; SOLVENT
AB Ionic liquids (ILs) have recently been demonstrated to be highly effective solvents for the dissolution of cellulose and lignocellulosic biomass. To date, there is no definitive rationale for selecting ionic liquids that are capable of dissolving these biopolymers. In this work, an all-atom force field for the IL 1-ethyl-3-methylimidazolium acetate [C2mim][OAc] was developed and the behavior of cellulose in this IL was examined using molecular dynamics simulations of a series of (1-4) linked beta-D-glucose oligomers with a degree of polymerization n = 5, 6, 10, and 20. Molecular dynamics Simulations were also carried out on cellulose oligomers in two common solvents, water and methanol, which are known to precipitate cellulose from IL solutions, to determine the extent and energetics of the interactions between these solvents and the cellulosic oligomers. Thermodynamic properties, Such as density and Solubility, as well as the two-body solute-solvent interaction energy terms, were calculated. The structural and dynamic behavior of solutions was analyzed and the conformations of cellulose oligomers were compared in ionic liquid and water mixtures. It was found that the interaction energy between the polysaccharide chain and the IL was stronger than that for either water or methanol. In addition to the anion acetate forming strong hydrogen bonds with hydroxyl groups of the cellulose, some of the cations were found to be in close contact with the polysaccharides through hydrophobic interactions. These results Support the concept that the cation may play a significant role in the dissolution of cellulose by [C2mim][OAc]. It is also observed that the preferred beta-(1,4)-glycosidic linkage conformation of the cellulose wits altered when dissolved in [C2mim][OAc] as compared to that found in crystalline cellulose dispersed in water. To Our knowledge, this report is the first theoretical Study that addresses the key factors in cellulose dissolution using all ionic liquid.
C1 [Liu, Hanbin; Sale, Kenneth L.; Holmes, Bradley M.; Simmons, Blake A.; Singh, Seema] Joint BioEnergy Inst, Deconstruct Div, Emeryville, CA 94608 USA.
[Liu, Hanbin; Holmes, Bradley M.; Simmons, Blake A.; Singh, Seema] Sandia Natl Labs, Biomass Sci & Convers Technol Dept, Livermore, CA 94551 USA.
[Sale, Kenneth L.] Sandia Natl Labs, Biosyst Res Dept, Livermore, CA 94551 USA.
RP Singh, S (reprint author), Joint BioEnergy Inst, Deconstruct Div, Emeryville, CA 94608 USA.
EM seesing@sandia.gov
OI Simmons, Blake/0000-0002-1332-1810
FU U.S. of Energy [DE-AC02-05CH11231]
FX This work was part of the DOE Joint BioEnergy Institute
(http://www.jbci.org) supported by the U.S. of Energy, Office of
Science, Office of Biological and Environmental Research, through
contract DE-AC02-05CH11231 between Lawrence Berkeley National Laboratory
and the U.S. Department of Energy. This research used resources of the
National Energy Research Scientific Computing Center (NERSC). We are
grateful for Prof. Harvey Blanch's guidance, stimulating discussions and
proof reading the manuscript. We thank Drs. Paul Adams, Gang Cheng and
Anthe George for their assistance on this project.
NR 62
TC 158
Z9 165
U1 12
U2 157
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1520-6106
J9 J PHYS CHEM B
JI J. Phys. Chem. B
PD APR 1
PY 2010
VL 114
IS 12
BP 4293
EP 4301
DI 10.1021/jp9117437
PG 9
WC Chemistry, Physical
SC Chemistry
GA 572TK
UT WOS:000275855800025
PM 20218725
ER
PT J
AU Laskin, J
Wang, P
Hadjar, O
AF Laskin, Julia
Wang, Peng
Hadjar, Omar
TI Soft-Landing of Co-III(salen)(+) and Mn-III(salen)(+) on Self-Assembled
Monolayer Surfaces
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID TRAP MASS-SPECTROMETER; SUPPORTED GOLD CLUSTERS; METAL-SALEN COMPLEXES;
PEPTIDE IONS; POLYATOMIC IONS; COVALENT IMMOBILIZATION;
DESORPTION-KINETICS; SANDWICH CLUSTERS; CHARGE REDUCTION; SPECTROSCOPY
AB Soft-landing of mass-selected Co-III(salen)(+) and Mn-III(salen)(+) complexes [salon = N,N'-ethylenebis(salicylide-neaminato)] was performed using self-assembled monolayer surfaces of alkanethiol (HSAM) and fluorinated alkanethiol (FSAM) oil gold as targets. Physical processes associated with ion deposition were studied using tithe-resolved in situ secondary ion mass spectrometry (SIMS) in a specially designed Fourier transform ion cyclotron resonance mass spectrometer (FT-ICR MS). We demonstrate charge retention by a significant fraction of precursor ions on the FSAM and complete neutralisation on the HSAM Surface. Our results indicate efficient electron transfer froth gold to the deposited species for the HSAM surface and inefficient, if ally, electron transfer oil the FSAM Surface. Formation of abundant cluster ions observed in SIMS spectra is attributed to gas-phase reactions ill the SIMS plume. Detailed analysis allowed us to extract the kinetics of both ionic and neutral complexes trapped on the FSAM Surface. The results indicate that neutralisation on this surface most likely takes place on the defect sites.
C1 [Laskin, Julia; Wang, Peng; Hadjar, Omar] Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
RP Laskin, J (reprint author), Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
EM Julia.Laskin@pnl.gov
RI Laskin, Julia/H-9974-2012
OI Laskin, Julia/0000-0002-4533-9644
FU Chemical Sciences Division; U.S. Department of Energy (DOE); U.S. DOE's
Office of Biological and Environmental Research and located at the
Pacific Northwest National Laboratory (PNNL)
FX This work was supported by the grant from the Chemical Sciences
Division, Office of Basic Energy Sciences of the U.S. Department of
Energy (DOE). The work was performed at the W. R. Wiley Environmental
Molecular Sciences Laboratory (EMSL), a national scientific user
facility sponsored by the U.S. DOE's Office of Biological and
Environmental Research and located at the Pacific Northwest National
Laboratory (PNNL). PNNL is operated by Battelle for the U.S. DOE.
NR 61
TC 27
Z9 28
U1 2
U2 11
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD APR 1
PY 2010
VL 114
IS 12
BP 5305
EP 5311
DI 10.1021/jp904384q
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 572TI
UT WOS:000275855600005
ER
PT J
AU Cannon, WR
Rawlins, MM
AF Cannon, William R.
Rawlins, Mitchell M.
TI Physicochemical/Thermodynamic Framework for the Interpretation of
Peptide Tandem Mass Spectra
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID COLLISION-INDUCED DISSOCIATION; PROTEIN IDENTIFICATION; SPECTROMETRY
DATA; PREDICTION; PROTEOMICS; LIBRARIES; MODEL
AB The interpretation of tandem mass spectra of peptides from collision-induced dissociation is discussed from the perspective of a multinomial data analysis problem and from the perspective of statistical mechanics. Both approaches use the same statistical likelihood function, but the free energy differs from the statistical likelihood by a term that additionally accounts for the sire of the system. In addition, it is shown that the statistical likelihood is equivalent to the information theory entropy when scaled appropriately. The likelihood function provides et physically and chemically principled wily to incorporate intensity information into the interpretation of tandem mass spectra. As a result, we demonstrate that incorporating the intensity information in this manner leads to an increased identification rate for database searches find allows for the simultaneous use of spectral libraries with standard database searching. The use of spectral libraries further increases the identification rate relative to database searching by 25-32%. Furthermore, the convergence of statistical and physical perspectives enables the future use of predictive modeling and simulation to inform the peptide identification process.
C1 [Cannon, William R.; Rawlins, Mitchell M.] Pacific NW Natl Lab, Computat Biol & Bioinformat Grp, Fundamental & Computat Sci Directorate, Richland, WA 99352 USA.
RP Cannon, WR (reprint author), Pacific NW Natl Lab, Computat Biol & Bioinformat Grp, Fundamental & Computat Sci Directorate, Richland, WA 99352 USA.
EM william.cannon@pnl.gov
RI Cannon, William/K-8411-2014
OI Cannon, William/0000-0003-3789-7889
FU U.S. Department of Energy (DOE) Office of Advanced Scientific Computing
Research [47901, 54976]; Office of Biological and Environmental Research
[54976]; Department of Energy's Office of Biological and Environmental
Research and located at Pacific Northwest National Laboratory
FX This work was supported through the U.S. Department of Energy (DOE)
Office of Advanced Scientific Computing Research tinder Contracts No.
47901 and 54976 and the Office of Biological and Environmental Research
tinder Contract No. 54976. We thank researchers in the laboratory of
Richard Smith at PNNL who generated the data sets herein, its well as
Dr. Smith, for providing the data. A portion of the research was
performed at the Environmental Molecular Scienecs Laboratory, it
national scientific user facility sponsored by the Department of
Energy's Office of Biological and Environmental Research and located at
Pacific Northwest National Laboratory. The Pacific Northwest National
Laboratory is a multiprogram laboratory operated by Battelle for the
U.S. DOE tinder Contract No. DE-AC06-76L01830.
NR 25
TC 2
Z9 2
U1 0
U2 5
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD APR 1
PY 2010
VL 114
IS 12
BP 5360
EP 5366
DI 10.1021/jp905049d
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 572TI
UT WOS:000275855600012
ER
PT J
AU Zhou, C
Jones, JC
Trionfi, A
Hsu, JWP
Walker, AV
AF Zhou, Chuanzhen
Jones, Jason C.
Trionfi, Aaron
Hsu, Julia W. P.
Walker, Amy V.
TI Electron Beam-Induced Damage of Alkanethiolate Self-Assembled Monolayers
Adsorbed on GaAs (001): A Static SIMS Investigation
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID ION MASS-SPECTROMETRY; SURFACE COVERAGE MEASUREMENTS; BARE SEMICONDUCTOR
SURFACES; NEAR-FIELD PHOTOLITHOGRAPHY; DIP-PEN NANOLITHOGRAPHY;
CHAIN-LENGTH; UV PHOTOOXIDATION; HOMOLOGOUS SERIES; RADIATION-DAMAGE;
ATOMIC-HYDROGEN
AB We have investigated the reaction pathways involved in the electron-beam-induced damage of -CH(3), -OH, and -COOH terminated alkanethiolate self-assembled monolayers (SAMs) adsorbed on GaAs (001) using time-of-flight secondary ion mass spectrometry. Upon electron beam exposure, the monolayers dehydrogenate, leading to the formation of C=C bonds, cross-links, and polycyclic aromatic hydrocarbons (PAHs). We also observe C-S bond scission. The data suggest that the electron beats damage is not uniform along the alkanethiol backbone. Upon electron beats exposure, we observe the loss of CO(2) and H(2)O From the -COOH and -OH terminated SAMs, respectively, indicating that the terminal groups decompose. Although the SAM degradation mechanism is similar to that previously reported for alkanethiolate SAMs adsorbed oil metals, there are some important differences. First, the electron close required to form C=C bonds and PAHs is much smaller than for SAMs adsorbed on metals. Second, although we observe C-S bond scission, we do not observe As-S or Ga-S bond scission and there is no desorption of S, or S-containing, fragments from the surface. We discuss the implications of these studies on the optimization of the experimental conditions for electron bears lithography using SAM resists on semiconductors.
C1 [Zhou, Chuanzhen; Walker, Amy V.] Washington Univ, Dept Chem, St Louis, MO 63130 USA.
[Zhou, Chuanzhen; Walker, Amy V.] Washington Univ, Ctr Mat Innovat, St Louis, MO 63130 USA.
[Jones, Jason C.; Trionfi, Aaron; Hsu, Julia W. P.] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA.
RP Walker, AV (reprint author), Univ Texas Dallas, Dept Mat Sci & Engn, 800 W Campbell Rd,RL 10, Richardson, TX 75080 USA.
EM amy.walker@utdallas.edu
RI zhou, chuanzhen/E-8773-2010; Schaff, William/B-5839-2009
FU National Science Foundation
FX A.V.W. acknowledges the financial support of a National Science
Foundation Grant. A.V.W. would also like to thank Kevin Moeller and Mike
Gross for many useful discussions. This work was performed in part at
the U.S. Department of Energy, Center for Integrated Nanotechnologies,
at Los Alamos and Sandia National Laboratories. Sandia National
Laboratories is a multiprogram laboratory operated by Sandia
Corporation, a Lockheed-Martin Company, for the U.S. Department of
Energy tinder Contract No. DE-AC04-94AL85000.
NR 67
TC 8
Z9 8
U1 0
U2 5
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD APR 1
PY 2010
VL 114
IS 12
BP 5400
EP 5409
DI 10.1021/jp905612p
PG 10
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 572TI
UT WOS:000275855600016
ER
PT J
AU Morrow, CP
Kubicki, JD
Mueller, KT
Cole, DR
AF Morrow, Christin P.
Kubicki, James D.
Mueller, Karl T.
Cole, David R.
TI Description of Mg2+ Release from Forsterite Using Ab Initio Methods
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID DISSOLUTION RATES; OLIVINE DISSOLUTION; QUARTZ DISSOLUTION; KINETICS;
COORDINATION; MINERALS; DENSITY; MECHANISMS; SURFACE; PH
AB Molecular clusters representative of protonated, neutral, and deprotonated sites on a forsterite (Mg2SiO4) surface were employed to facilitate examination of Mg-O-hr bond-breaking via density functional theory (DFT) calculations with the B3LYP/6-31+G(d,p) methodology. Hydrolysis reactions of the molecular clusters with a H2O molecule yielded barrier heights of 21, 54, and 39 kJ/mol for protonated, neutral,;and deprotonated sites in the as-phase, respectively, and the rate constants calculated using these barrier heights were 5.7 x 10(8), 2.7 x 10(4), and 2.2 x 10(6) s(-1), respectively. Aqueous-phase calculations on the gas-phase Structures were also performed, and the barrier heights were 33, 40, and 21 kJ/mol for the protonated, neutral, and deprotonated models. Rate constants were 4.3 x 10(6), 6.1 x 10(5), and 6.0 x 10(8) s(-1). For models energy-minimized in the aqueous-phase, the barrier heights were 37, 44, and 40 kJ/mol, and the rate constants were 1.7 x 10(6), 3.0 x 10(4), and 9.9 x 10(5) s(-1), respectively. These differences highlight the importance of modeling Structures with inclusion of solvent effects. Rates of Mg2+ release from the forsterite surface were predicted using these rate constants and models of the reactive site density and the H+ or OH- surface speciation. These calculations are consistent with a more rapid rate of Mg2+ release under acidic conditions even though the activation energy barriers are equivalent within computational uncertainty. A comparison of these results to previous data shows that the predicted rates are much faster than experimentally measured Mg2+ release rates, suggesting that breaking the Mg-O-hr bond is a rapid process which is a component of Mg2+ release from the Surface consistent with previous experimental observation of preferential Mg2+ leaching from forsterite. A dissolution mechanism involving polymerization and hydrolysis of Si-O-br-Si linkages is discussed that is consistent with the discrepancy between Mg2+ release rates and dissolution rates of forsterite.
C1 [Kubicki, James D.] Penn State Univ, Dept Geosci, University Pk, PA 16802 USA.
[Kubicki, James D.] Penn State Univ, Earth & Environm Syst Inst, University Pk, PA 16802 USA.
[Morrow, Christin P.; Mueller, Karl T.] Penn State Univ, Dept Chem, University Pk, PA 16802 USA.
[Cole, David R.] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA.
RP Kubicki, JD (reprint author), Penn State Univ, Dept Geosci, University Pk, PA 16802 USA.
EM kubicki@geose.psu.edu
RI Mueller, Karl/A-3637-2010; Kubicki, James/I-1843-2012
OI Kubicki, James/0000-0002-9277-9044
FU National Science Foundation [CHE-0431328, CHE-0535656]; U.S. Department
of Energy, Biological and Environmental Research (BER); U.S. Department
of Energy [FWP ERKCC72, DE-AC05-00OR22725]
FX The authors thank Michael C. Davis and Rebecca L. Sanders of PSU for
meaningful discussions. The calculations in this work were performed
using the Linux cluster maintained by the Research Computing and
Cyberinfrastructure (RCC) group (http://gcars.aset.psu.edu/) at The
Pennsylvania State University. This material is based upon work
Supported by the National Science Foundation under Grant No. CHE-0431328
(the Center for Environmental Kinetics Analysis, an NSF-DOE
environmental molecular sciences institute) and the U.S. Department of
Energy, Biological and Environmental Research (BER), and the
ChemxSeer project is sponsored by the National Science
Foundation under Grant No. CHE-0535656. DRC is supported from the U.S.
Department of Energy through 'Structure and Dynamics of Earth Materials,
Interfaces, and Reactions' (FWP ERKCC72) under Contract No.
DE-AC05-00OR22725 to Oak Ridge National Laboratory, managed and operated
by UT-Battelle, LLC.
NR 60
TC 7
Z9 7
U1 2
U2 15
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD APR 1
PY 2010
VL 114
IS 12
BP 5417
EP 5428
DI 10.1021/jp9057719
PG 12
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 572TI
UT WOS:000275855600018
ER
PT J
AU Zubarev, DY
Robertson, N
Domin, D
McClean, J
Wang, JH
Lester, WA
Whitesides, R
You, XQ
Frenklach, M
AF Zubarev, Dmitry Yu.
Robertson, Neil
Domin, Dominik
McClean, Jarrod
Wang, Jinhua
Lester, William A., Jr.
Whitesides, Russell
You, Xiaoqing
Frenklach, Michael
TI Local Electronic Structure and Stability of Pentacene Oxyradicals
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID INDEPENDENT CHEMICAL-SHIFTS; MOLECULAR-ORBITAL METHODS; INDUCED
MAGNETIC-FIELD; GAUSSIAN-TYPE BASIS; CORRELATION-ENERGY;
ORGANIC-MOLECULES; AROMATICITY; DENSITY; OXIDATION; SURFACE
AB A series of pentacene oxyradicals is studied as a model of an oxidized graphene edge. The relative stability of the oxyradical species formed is rationalized on the basis of the concept of local aromaticity. It is found that qualitative and quantitative measures of delocalized bonding show consistently that formation of the pi-aromatic fragments associated with different reference pi-aromatic systems explain trends in Gibbs free energies and relative energies. As a result, a chemically intuitive model based on aromaticity can explain the relative stability of the oxyradicals in a way that uniquely appeals to chemists' knowledge of structure and reactivity.
C1 [Zubarev, Dmitry Yu.; Domin, Dominik; McClean, Jarrod; Wang, Jinhua; Lester, William A., Jr.] Univ Calif Berkeley, Kenneth S Pitzer Ctr Theoret Chem, Dept Chem, Berkeley, CA 94720 USA.
[Domin, Dominik; Lester, William A., Jr.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA.
[Whitesides, Russell; Frenklach, Michael] Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA.
[Robertson, Neil; Whitesides, Russell; You, Xiaoqing; Frenklach, Michael] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA.
[Wang, Jinhua] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China.
RP Lester, WA (reprint author), Univ Calif Berkeley, Kenneth S Pitzer Ctr Theoret Chem, Dept Chem, Berkeley, CA 94720 USA.
EM walester@lbl.gov
RI You, Xiaoqing/B-1240-2015
FU Director, Office of Energy Research, Office of Basic Energy Sciences,
Chemical Science, Geosciences and Biosciences Division of the US
Department of Energy [DE-AC03-76F00098]; US Army Corps of Engineers,
Humphreys Engineering Center Support Activity [W912HQ-07-C-0044];
National Science Foundation [NSF CHE-0809969]; China Scholarship Council
FX R.W., D.D., W.A.L., and M.F. were supported by the Director, Office of
Energy Research, Office of Basic Energy Sciences, Chemical Science,
Geosciences and Biosciences Division of the US Department of Energy,
under Contract No. DE-AC03-76F00098. N.R., X.Y., and M.F. were Supported
by the US Army Corps of Engineers, Humphreys Engineering Center Support
Activity, Under Contract No. W912HQ-07-C-0044. D.Y.Z. was Supported by
the National Science Foundation under Grant No. NSF CHE-0809969. J.W. is
a UC Berkeley visitor Supported by a stipend from the China Scholarship
Council.
NR 48
TC 15
Z9 15
U1 1
U2 11
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD APR 1
PY 2010
VL 114
IS 12
BP 5429
EP 5437
DI 10.1021/jp9058615
PG 9
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 572TI
UT WOS:000275855600019
ER
PT J
AU Jiang, H
Jordan, KD
AF Jiang, H.
Jordan, K. D.
TI Comparison of the Properties of Xenon, Methane, and Carbon Dioxide
Hydrates from Equilibrium and Nonequilibrium Molecular Dynamics
Simulations
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID INELASTIC NEUTRON-SCATTERING; CO2 CLATHRATE HYDRATE;
THERMAL-CONDUCTIVITY; STRUCTURE-I; SINGLE-CRYSTAL; ETHYLENE-OXIDE;
AB-INITIO; LATTICE; DISTORTION; WATER
AB Molecular dynamics simulations are used to characterize the hydrates of Xe, methane, and CO(2), allowing for a systematic comparison of the structural and dynamical properties for these three hydrates. Although the host-guest interaction energy for the T = 0 K structures is most attractive in the case of Xe, other structural and dynamical properties from the simulations indicate that, in fact, host-guest coupling is most important for the CO(2) hydrate. Specifically, the host lattice of CO(2) hydrate expands more with increasing temperature than do the lattices of the xenon anti methane hydrates, and the translational and rotational dynamics of the water molecules are predicted to be most perturbed in the CO(2) hydrate. The simulations predict that the CO(2) and xenon hydrates have lower speed of sound values and lower themal conductivities than methane hydrate or the empty lattice.
C1 [Jordan, K. D.] US DOE, Natl Energy Technol Lab, Pittsburgh, PA USA.
Univ Pittsburgh, Dept Chem, Pittsburgh, PA 15260 USA.
RP Jordan, KD (reprint author), US DOE, Natl Energy Technol Lab, POB 10940, Pittsburgh, PA USA.
EM jordan@pitt.edu
RI JIANG, HAO/C-3672-2008
OI JIANG, HAO/0000-0002-4363-0112
FU National Energy Technology Laboratory [DE-AC26-04NT41817,
41817.606.08.102]
FX This technical effort is part of the National Energy Technology
Laboratory's ongoing research in gas hydrates under Contract No.
DE-AC26-04NT41817, subtask 41817.606.08.102. The calculations were
carried out on computers in the University of Pittsburgh's Center for
molecular and Materials Simulations.
NR 70
TC 22
Z9 23
U1 0
U2 24
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD APR 1
PY 2010
VL 114
IS 12
BP 5555
EP 5564
DI 10.1021/jp9063406
PG 10
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 572TI
UT WOS:000275855600033
ER
PT J
AU Tamam, L
Pontoni, D
Hofmann, T
Ocko, BM
Reichert, H
Deutsch, M
AF Tamam, Lilach
Pontoni, Diego
Hofmann, Tommy
Ocko, Benjamin M.
Reichert, Harald
Deutsch, Moshe
TI Atomic-Scale Structure of a Liquid Metal-Insulator Interface
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID X-RAY REFLECTIVITY; VAPOR INTERFACES; SURFACE-TENSION; MERCURY; ALLOYS;
ADSORPTION; PROFILE; FILMS; AL; CU
AB The structure of the liquid Hg/sapphire interface was measured with angstrom-scale resolution by high-energy X-ray reflectivity. The atomic Hg layering found at the interface is less pronounced than at the Hg/vapor interface, showing a twice-shorter decay length with depth, and a weaker peak/valley density contrast. We also find a near-interface, 8 +/- 3 angstrom thick layer, the density of which, although depth-varying, is enhanced, on average, by 10 +/- 5% relative to the bulk. The enhancement is assigned to a 0.13 +/- 0.05 e/atom charge transfer from the Hg to the substrate, somewhat less than theory. The unexplained anomalous temperature dependence previously reported for the mercury/vapor density profile is absent here, implying a nonstructural origin for the anomaly.
C1 [Tamam, Lilach; Deutsch, Moshe] Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel.
[Tamam, Lilach; Deutsch, Moshe] Bar Ilan Univ, Inst Nanotechnol & Adv Mat, IL-52900 Ramat Gan, Israel.
[Pontoni, Diego; Reichert, Harald] ESRF, Grenoble, France.
[Hofmann, Tommy; Ocko, Benjamin M.] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, New York, NY 11973 USA.
[Reichert, Harald] Max Planck Inst Met Res, D-70569 Stuttgart, Germany.
RP Deutsch, M (reprint author), Bar Ilan Univ, Dept Phys, IL-52900 Ramat Gan, Israel.
EM deutsch@mail.biu.ac.il
FU US-Israel Binational Science Foundation, Jerusalem; DOE
[DE-AC02-76CH0016]
FX This work was supported by the US-Israel Binational Science Foundation,
Jerusalem (M.D.). Brookhaven National Laboratory (BNL) is supported by
DOE Contract DE-AC02-76CH0016. We thank ESRF for beamtime at ID15A.
NR 45
TC 13
Z9 13
U1 2
U2 11
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1948-7185
J9 J PHYS CHEM LETT
JI J. Phys. Chem. Lett.
PD APR 1
PY 2010
VL 1
IS 7
BP 1041
EP 1045
DI 10.1021/jz1000209
PG 5
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 588BN
UT WOS:000277041300005
ER
PT J
AU Amirav, L
Alivisatos, AP
AF Amirav, Lilac
Alivisatos, A. Paul
TI Photocatalytic Hydrogen Production with Tunable Nanorod Heterostructures
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID SELECTIVE GROWTH; SEEDED GROWTH; METAL TIPS; SEMICONDUCTOR;
NANOCRYSTALS; SUSPENSIONS; EVOLUTION; WATER
AB We report the design of a multicomponent nanoheterostructure aimed at photocatalytic production of hydrogen. The system is composed of a platinum-tipped cadmium sulfide rod with an embedded cadmium selenide seed. In such structures, holes are three-dimensionally confined to. the cadmium selenide, whereas the delocalized electrons are transferred to the metal tip. Consequently, the electrons are now separated from the holes over three different components and by a tunable physical length. The seeded rod metal tip samples studied here facilitate efficient long-lasting charge carrier separation and minimize back reaction of intermediates. By tuning the nanorod heterostructure length and the seed size, we were able to significantly increase the activity for hydrogen production compared to that of unseeded rods. This structure was found to be highly active for hydrogen production, with an apparent quantum yield of 20% at 450 nm, and was active under orange light illumination and demonstrated improved stability compared to CdS rods without a CdSe seed.
C1 [Alivisatos, A. Paul] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Alivisatos, AP (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
EM alivis@berkeley.edu
FU U.S. Department of Energy [DE-AC02-05CH11231]; National Center for
Electron Microscopy at the Lawrence Berkeley National Laboratory;
Weizmann Institute of Science
FX This work was funded by the Helios Solar Energy Research Center, which
is supported by the Director, Office of Science, Office of Basic Energy
Sciences of the U.S. Department of Energy under Contract No.
DE-AC02-05CH11231. The authors acknowledge support of the National
Center for Electron Microscopy at the Lawrence Berkeley National
Laboratory for the use of their microscope facilities. L.A. thanks the
Weizmann Institute of Science Postdoctoral Award Program for Advancing
Women in Science for partial financial support.
NR 16
TC 308
Z9 309
U1 16
U2 237
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1948-7185
J9 J PHYS CHEM LETT
JI J. Phys. Chem. Lett.
PD APR 1
PY 2010
VL 1
IS 7
BP 1051
EP 1054
DI 10.1021/jz100075c
PG 4
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 588BN
UT WOS:000277041300007
ER
PT J
AU Stengle, G
McEnerney, J
Robson, R
AF Stengle, Gilbert
McEnerney, James
Robson, Robert
TI Convex polarities over ordered fields
SO JOURNAL OF PURE AND APPLIED ALGEBRA
LA English
DT Article
AB We use tools and methods from real algebraic geometry (spaces of ultrafilters, elimination of quantifiers) to formulate a theory of convexity in K(N) over an arbitrary ordered field. By defining certain ideal points (which can be viewed as generalizations of recession cones) we obtain a generalized notion of polar set. These satisfy a form of polar duality that applies to general convex sets and does not reduce to classical duality if K is the field of real numbers. As an application we give a partial classification of total orderings of Artinian local rings and two applications to ordinary convex geometry over the real numbers. (C) 2009 Elsevier B.V. All rights reserved.
C1 [McEnerney, James] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
[Robson, Robert] Oregon State Univ, Dept Math, Corvallis, OR 97331 USA.
[Stengle, Gilbert] Lehigh Univ, Princeton, NJ 08540 USA.
[Stengle, Gilbert] Univ Complutense Madrid, E-28040 Madrid, Spain.
RP McEnerney, J (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
EM gas0@lehigh.edu; mcenerney1@llnl.gov; robby@ORST.EDU
FU Spanish Ministry of Education [DGES SAB 1995-0592]
FX The third author was partially supported by Spanish Ministry of
Education DGES SAB 1995-0592. We thank Murray Schechter and Charles
Delzell for discussions and valuable criticism.
NR 14
TC 1
Z9 1
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0022-4049
J9 J PURE APPL ALGEBRA
JI J. Pure Appl. Algebr.
PD APR
PY 2010
VL 214
IS 4
BP 370
EP 379
DI 10.1016/j.jpaa.2009.06.006
PG 10
WC Mathematics, Applied; Mathematics
SC Mathematics
GA 539IX
UT WOS:000273248700006
ER
PT J
AU Monroe, EM
Pan, R
Anderson-Cook, CM
Montgomery, DC
Borror, CM
AF Monroe, Eric M.
Pan, Rong
Anderson-Cook, Christine M.
Montgomery, Douglas C.
Borror, Connie M.
TI Sensitivity Analysis of Optimal Designs for Accelerated Life Testing
SO JOURNAL OF QUALITY TECHNOLOGY
LA English
DT Article
DE Design of Experiments; Reliability Testing; Robustness; UC-Optimality;
Use Condition
AB In experimental testing, it is desirable to select combinations of input factors that yield optimal results given an objective specified by a practitioner. Often this objective involves minimizing the uncertainty in a parameter or prediction estimate. To determine the experimental design to achieve such an objective, it is necessary to understand the relationship between the testing variables and the response. Alphabetic optimal designs are commonly used in such applications based largely on the ease of their construction with advanced statistical software. However, many publications cite concerns with the overall robustness of such designs to small departures in parameter estimates. This paper examines the issue of model parameter sensitivity to the selection of an accelerated life test based on the UC-optimality criterion, minimizing of the prediction variance at the usage condition, using a generalized linear model framework. We will examine the trade-off implications of choice of experimental design, sample size, and censoring.
C1 [Monroe, Eric M.] Intel Corp, Chandler, AZ 85226 USA.
[Pan, Rong; Montgomery, Douglas C.] Arizona State Univ, Tempe, AZ 85287 USA.
[Anderson-Cook, Christine M.] Los Alamos Natl Lab, Stat Sci Grp, Los Alamos, NM 87545 USA.
[Borror, Connie M.] Arizona State Univ, Glendale, AZ 85306 USA.
RP Monroe, EM (reprint author), Intel Corp, Chandler, AZ 85226 USA.
EM eric.m.monroe@intel.com; rong.pan@asu.edu; c-and-cook@lanl.gov;
doug.montgomery@asu.edu; conni@asu.edu
FU NSF [CMMI-0654417, CMMI-0928746]
FX The authors would like to thank the editor and the two anonymous
referees for their helpful comments and suggestions that have
strengthened this paper. We acknowledge the support of NSF grants
CMMI-0654417 and CMMI-0928746.
NR 18
TC 13
Z9 13
U1 1
U2 5
PU AMER SOC QUALITY CONTROL-ASQC
PI MILWAUKEE
PA 600 N PLANKINTON AVE, MILWAUKEE, WI 53203 USA
SN 0022-4065
J9 J QUAL TECHNOL
JI J. Qual. Technol.
PD APR
PY 2010
VL 42
IS 2
BP 121
EP 135
PG 15
WC Engineering, Industrial; Operations Research & Management Science;
Statistics & Probability
SC Engineering; Operations Research & Management Science; Mathematics
GA 576DY
UT WOS:000276125700002
ER
PT J
AU Silver, GL
AF Silver, G. L.
TI Equilibrium-constant expressions for aqueous plutonium
SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
LA English
DT Article
DE Plutonium; Disproportionation; Equilibrium constants; Hydrolysis
AB Equilibrium-constant expressions for Pu disproportionation reactions traditionally contain three or four terms representing the concentrations or fractions of the oxidation states. The expressions can be rewritten so that one of the oxidation states is replaced by a term containing the oxidation number of the plutonium. Experimental estimations of the numerical values of the constants can then be checked in several ways.
C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Silver, GL (reprint author), Los Alamos Natl Lab, POB 1663,MS E502, Los Alamos, NM 87545 USA.
EM gsilver@lanl.gov
NR 8
TC 2
Z9 2
U1 0
U2 2
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0236-5731
J9 J RADIOANAL NUCL CH
JI J. Radioanal. Nucl. Chem.
PD APR
PY 2010
VL 284
IS 1
BP 175
EP 177
DI 10.1007/s10967-010-0458-z
PG 3
WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science &
Technology
SC Chemistry; Nuclear Science & Technology
GA 571JV
UT WOS:000275749000026
ER
PT J
AU Lin, G
Tartakovsky, AM
AF Lin, G.
Tartakovsky, A. M.
TI Numerical Studies of Three-dimensional Stochastic Darcy's Equation and
Stochastic Advection-Diffusion-Dispersion Equation
SO JOURNAL OF SCIENTIFIC COMPUTING
LA English
DT Article
DE Probabilistic collocation method; Sparse grids; Porous media; Polynomial
chaos
ID HETEROGENEOUS POROUS-MEDIA; KARHUNEN-LOEVE EXPANSION; MONOMIAL CUBATURE
RULES; DIFFERENTIAL-EQUATIONS; SOLUTE TRANSPORT; ORTHOGONAL POLYNOMIALS;
SOBOLEV SPACES; SPARSE GRIDS; COMPILATION; EFFICIENT
AB Solute transport in randomly heterogeneous porous media is commonly described by stochastic flow and advection-dispersion equations with a random hydraulic conductivity field. The statistical distribution of conductivity of engineered and naturally occurring porous material can vary, depending on its origin. We describe solutions of a three-dimensional stochastic advection-dispersion equation using a probabilistic collocation method (PCM) on sparse grids for several distributions of hydraulic conductivity. Three random distributions of log hydraulic conductivity are considered: uniform, Gaussian, and truncated Gaussian (beta). Log hydraulic conductivity is represented by a Karhunen-LoSve (K-L) decomposition as a second-order random process with an exponential covariance function. The convergence of PCM has been demonstrated. It appears that the accuracy in both the mean and the standard deviation of PCM solutions can be improved by using the Jacobi-chaos representing the truncated Gaussian distribution rather than the Hermite-chaos for the Gaussian distribution. The effect of type of distribution and parameters such as the variance and correlation length of log hydraulic conductivity and dispersion coefficient on leading moments of the advection velocity and solute concentration was investigated.
C1 [Lin, G.; Tartakovsky, A. M.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Lin, G (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd,Box 999, Richland, WA 99352 USA.
EM guang.lin@pnl.gov
RI Lin, Guang/D-1376-2011
FU U.S. Department of Energy Office of Science; U.S. Department of Energy
[DE-AC05-76RL01830]
FX This work was supported by the Advanced Scientific Computing Research
Program of the U.S. Department of Energy Office of Science. Computations
were performed using the computational resources of the Environmental
Molecular Sciences Laboratory. Pacific Northwest National Laboratory is
operated by Battelle for the U.S. Department of Energy under Contract
DE-AC05-76RL01830.
NR 37
TC 18
Z9 18
U1 0
U2 8
PU SPRINGER/PLENUM PUBLISHERS
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0885-7474
EI 1573-7691
J9 J SCI COMPUT
JI J. Sci. Comput.
PD APR
PY 2010
VL 43
IS 1
BP 92
EP 117
DI 10.1007/s10915-010-9346-5
PG 26
WC Mathematics, Applied
SC Mathematics
GA 561EZ
UT WOS:000274960000005
ER
PT J
AU Tang, M
Holliday, KS
Jiang, C
Valdez, JA
Uberuaga, BP
Dickerson, PO
Dickerson, RM
Wang, Y
Czerwinski, KR
Sickafus, KE
AF Tang, M.
Holliday, K. S.
Jiang, C.
Valdez, J. A.
Uberuaga, B. P.
Dickerson, P. O.
Dickerson, R. M.
Wang, Y.
Czerwinski, K. R.
Sickafus, K. E.
TI Order-to-disorder phase transformation in ion irradiated uranium-bearing
delta-phase oxides RE6U1O12 (RE=Y, Gd, Ho, Yb, and Lu)
SO JOURNAL OF SOLID STATE CHEMISTRY
LA English
DT Article
DE Uranate; Irradiation damage effects; Phase transformation; TEM; XRD
AB Polycrystalline uranium-bearing compounds Y6U1O12, Gd6U1O12, Ho6U1O12, Yb6U1O12, and Lu6U1O12 samples were irradiated with various ions species (300 keV Kr++, 400 keV Ne++, and 100 keV He+) at cryogenic temperature (similar to 100 K), and the microstructures were examined following irradiation using grazing incidence X-ray diffraction and transmission electron microscopy. The pristine samples are characterized by an ordered, fluorite derivative structure, known as the delta phase. This structure possesses rhombohedral symmetry. Amorphization was not observed in any of the irradiated samples, even at the highest dose similar to 65 dpa (displacement per atom). On the other hand, some of these compounds experienced an order-to-disorder (O-D) phase transformation, from an ordered rhombohedral to a disordered fluorite structure, at ion doses between 2.5 and 65 dpa, depending on ion irradiation species. Factors influencing the irradiation-induced O-D transformation tendencies of these compounds are discussed in terms of density functional theory calculations of the O-D transformation energies. (C) 2010 Elsevier Inc. All rights reserved.
C1 [Tang, M.; Jiang, C.; Valdez, J. A.; Uberuaga, B. P.; Dickerson, P. O.; Dickerson, R. M.; Wang, Y.; Sickafus, K. E.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
[Holliday, K. S.; Czerwinski, K. R.] Univ Nevada, Radiochem Grp, Las Vegas, NV 89154 USA.
RP Tang, M (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, Mail Stop G755, Los Alamos, NM 87545 USA.
EM mtang@lanl.gov
RI Jiang, Chao/A-2546-2011; Dickerson, Robert/C-9237-2013
FU Seaborg Institute for Transactinium Science, Los Alamos National
Laboratory; US Department of Energy. Office of Basic Energy Sciences,
Division of Materials Sciences and Engineering
FX This work was sponsored by the Seaborg Institute for Transactinium
Science, Los Alamos National Laboratory, and the US Department of
Energy. Office of Basic Energy Sciences, Division of Materials Sciences
and Engineering.
NR 17
TC 13
Z9 13
U1 0
U2 7
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0022-4596
J9 J SOLID STATE CHEM
JI J. Solid State Chem.
PD APR
PY 2010
VL 183
IS 4
BP 844
EP 848
DI 10.1016/j.jssc.2010.01.020
PG 5
WC Chemistry, Inorganic & Nuclear; Chemistry, Physical
SC Chemistry
GA 583EA
UT WOS:000276654700012
ER
PT J
AU Liu, P
Yin, GP
Shao, YY
AF Liu, Peng
Yin, Ge-Ping
Shao, Yu-Yan
TI High electrochemical activity of Pt/C cathode modified with NH4HCO3 for
direct methanol fuel cell
SO JOURNAL OF SOLID STATE ELECTROCHEMISTRY
LA English
DT Article; Proceedings Paper
CT 5th Baltic Conference on Electrochemistry
CY APR 30-MAY 03, 2008
CL Tartu, ESTONIA
DE Direct methanol fuel cell; Catalyst-coated membrane; Electrochemical
surface area; Pore-forming agent
ID CATALYST LAYER; MEA FABRICATION; PERFORMANCE; ELECTRODE; DMFC;
OXIDATION; ANODE; ELECTROOXIDATION; NANOPARTICLES; DEPOSITION
AB The electrochemical activity of Pt/C cathode for direct methanol fuel cell was improved by introducing NH4HCO3 to the catalyst layer as the pore-forming agent during preparation process of catalyst-coated membrane. SEM analysis revealed that NH4HCO3 contributed to the formation of additional porosity and the dispersion of the catalyst particles. The modified catalyst layer promoted the electrochemical and mass transport processes. It was suggested that the optimal weight ratio of the catalyst to NH4HCO3 was 2:3. As a result, the single cell exhibited a 21% increment in the peak power density at 50 A degrees C, with a highest electrochemical surface area of 446 cm(2) mg (Pt) (-1) . However, an extremely high content of NH4HCO3 yielded discontinuous pathways for the electron transfer in the catalyst layer.
C1 [Liu, Peng; Yin, Ge-Ping] Harbin Inst Technol, Sch Chem Engn & Technol, Harbin 150006, Peoples R China.
[Shao, Yu-Yan] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Yin, GP (reprint author), Harbin Inst Technol, Sch Chem Engn & Technol, Harbin 150006, Peoples R China.
EM yingphit@hit.edu.cn
RI Shao, Yuyan/A-9911-2008
OI Shao, Yuyan/0000-0001-5735-2670
FU Natural Science Foundation of China [50872027]; Coslight International
Group
FX The authors are grateful to the financial supports from Natural Science
Foundation of China (No. 50872027) and Coslight International Group.
NR 32
TC 4
Z9 4
U1 0
U2 11
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1432-8488
EI 1433-0768
J9 J SOLID STATE ELECTR
JI J. Solid State Electrochem.
PD APR
PY 2010
VL 14
IS 4
BP 633
EP 636
DI 10.1007/s10008-009-0826-1
PG 4
WC Electrochemistry
SC Electrochemistry
GA 545RI
UT WOS:000273753700017
ER
PT J
AU Ba, X
Rafailovich, M
Meng, YZ
Pernodet, N
Wirick, S
Furedi-Milhofer, H
Qin, YX
DiMasi, E
AF Ba, Xiaolan
Rafailovich, Miriam
Meng, Yizhi
Pernodet, Nadine
Wirick, Sue
Fueredi-Milhofer, Helga
Qin, Yi-Xian
DiMasi, Elaine
TI Complementary effects of multi-protein components on biomineralization
in vitro
SO JOURNAL OF STRUCTURAL BIOLOGY
LA English
DT Article
DE Extracellular matrix; Fibronectin; Elastin; Biomineralization;
Hydroxyapatite
ID EXTRACELLULAR-MATRIX; CALCIUM-PHOSPHATE; CALCIFICATION; FIBRONECTIN;
BONE; FIBRILLOGENESIS; MICROSCOPY; CARTILAGE; COLLAGEN; GROWTH
AB The extracellular matrix (ECM) is composed of mixed protein fibers whose precise composition affects biomineralization. New methods are needed to probe the interactions of these proteins with calcium phosphate mineral and with each other. Here we follow calcium phosphate mineralization on protein fibers self-assembled in vitro from solutions of fibronectin, elastin and their mixture. We probe the surface morphology and mechanical properties of the protein fibers during the early stages. The development of mineral crystals on the protein matrices is also investigated. In physiological mineralization solution, the elastic modulus of the fibers in the fibronectin-elastin mixture increases to a greater extent than that of the fibers from either pure protein. In the presence of fibronectin, longer exposure in the mineral solution leads to the formation of amorphous calcium phosphate particles templated along the self-assembled fibers, while elastin fibers only collect calcium without any mineral observed during early stage. TEM images confirm that small needle-shape crystals are confined inside elastin fibers which suppress the release of mineral outside the fibers during late stage, while hydroxyapatite crystals form when fibronectin is present. These results demonstrate complementary actions of the two ECM proteins fibronectin and elastin to collect cations and template mineral, respectively. (C) 2009 Elsevier Inc. All rights reserved.
C1 [Ba, Xiaolan; Rafailovich, Miriam; Meng, Yizhi; Pernodet, Nadine] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA.
[Wirick, Sue] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA.
[Fueredi-Milhofer, Helga] Hebrew Univ Jerusalem, Dept Chem, Jerusalem, Israel.
[Qin, Yi-Xian] SUNY Stony Brook, Dept Biomed Engn, Stony Brook, NY 11794 USA.
[DiMasi, Elaine] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA.
RP Rafailovich, M (reprint author), SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA.
EM mrafailovich@notes.cc.sunysb.edu
RI Meng, Yizhi/B-1233-2008
FU NSF-MRSEC Program [DMR0606387]; Brookhaven National Laboratory-Stony
Brook University Seed Grand Program; NIH [R01 AR52379, R01 AR49286];
USDOE [DE-ACO2-98CH10886]
FX This work is supported by NSF-MRSEC Program (DMR0606387), the Brookhaven
National Laboratory-Stony Brook University Seed Grand Program and NIH
program (R01 AR52379 and R01 AR49286). Research carried out in part at
the Center for Functional Nanomaterials and National Synchrotron Light
Source, Brookhaven National Laboratory, which is supported under USDOE
Contract DE-ACO2-98CH10886.
NR 29
TC 6
Z9 6
U1 2
U2 16
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 1047-8477
J9 J STRUCT BIOL
JI J. Struct. Biol.
PD APR
PY 2010
VL 170
IS 1
BP 83
EP 92
DI 10.1016/j.jsb.2009.12.018
PG 10
WC Biochemistry & Molecular Biology; Biophysics; Cell Biology
SC Biochemistry & Molecular Biology; Biophysics; Cell Biology
GA 578XH
UT WOS:000276329600010
PM 20035875
ER
PT J
AU Shatsky, M
Hall, RJ
Nogales, E
Malik, J
Brenner, SE
AF Shatsky, Maxim
Hall, Richard J.
Nogales, Eva
Malik, Jitendra
Brenner, Steven E.
TI Automated multi-model reconstruction from single-particle electron
microscopy data
SO JOURNAL OF STRUCTURAL BIOLOGY
LA English
DT Article
DE Heterogeneous reconstruction; Heterogeneous data; Multi-model
reconstruction
ID RNA-POLYMERASE-II; STATISTICAL-ANALYSIS; IMAGE SEGMENTATION; ELONGATION
COMPLEX; STRUCTURAL BASIS; CLASSIFICATION; RESOLUTION; MACROMOLECULES;
FLEXIBILITY; CRYOMICROSCOPY
AB Biological macromolecules can adopt multiple conformational and compositional states due to structural flexibility and alternative subunit assemblies. This structural heterogeneity poses a major challenge in the study of macromolecular structure using single-particle electron microscopy. We propose a fully automated, unsupervised method for the three-dimensional reconstruction of multiple structural models from heterogeneous data. As a starting reference, our method employs an initial structure that does not account for any heterogeneity. Then, a multi-stage clustering is used to create multiple models representative of the heterogeneity within the sample. The multi-stage clustering combines an existing approach based on Multivariate Statistical Analysis to perform clustering within individual Euler angles, and a newly developed approach to sort out class averages from individual Euler angles into homogeneous groups. Structural models are computed from individual clusters. The whole data classification is further refined using an iterative multi-model projection-matching approach. We tested our method on one synthetic and three distinct experimental datasets. The tests include the cases where a macromolecular complex exhibits structural flexibility and cases where a molecule is found in ligand-bound and unbound states. We propose the use of our approach as an efficient way to reconstruct distinct multiple models from heterogeneous data. (C) 2010 Elsevier Inc. All rights reserved.
C1 [Shatsky, Maxim; Brenner, Steven E.] Univ Calif Berkeley, Dept Plant & Microbial Biol, Berkeley, CA 94720 USA.
[Shatsky, Maxim; Brenner, Steven E.] Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
[Shatsky, Maxim; Hall, Richard J.; Nogales, Eva; Brenner, Steven E.] Univ Calif Berkeley, Inst QB3, Berkeley, CA 94720 USA.
[Nogales, Eva] Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA 94720 USA.
[Nogales, Eva] Univ Calif Berkeley, Howard Hughes Med Inst, Dept Mol & Cell Biol, Berkeley, CA 94720 USA.
[Malik, Jitendra] Univ Calif Berkeley, Elect Engn & Comp Sci Div, Berkeley, CA 94720 USA.
RP Shatsky, M (reprint author), Univ Calif Berkeley, Dept Plant & Microbial Biol, 461 Koshland Hall, Berkeley, CA 94720 USA.
EM maxshats@compbio.berkeley.edu
RI Brenner, Steven/A-8729-2008
OI Brenner, Steven/0000-0001-7559-6185
FU US Department of Energy [DE-AC02-05CH11231]; National Institutes of
Health NIGMS [R01 GM63072]; Human Frontiers Science Program [RPG0039]
FX We thank Andres Leschziner for providing the Klenow fragment models,
Patricia Grob for providing the hRNAPII data, Bunpote Sidirechadilok for
the eIF3-IRES data, Joachim Frank for providing the ribosome data, Elena
Orlova for providing results of the Double MSA method, and Sjors Scheres
for providing results of the ML3D program. This work was supported in
part by US Department of Energy Contract DE-AC02-05CH11231 awarded to
Lawrence Berkeley National Laboratory (SEB, MS), by Grant R01 GM63072
from the National Institutes of Health NIGMS (EN), and Grant RPG0039
from the Human Frontiers Science Program (EN).
NR 33
TC 21
Z9 21
U1 0
U2 9
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 1047-8477
J9 J STRUCT BIOL
JI J. Struct. Biol.
PD APR
PY 2010
VL 170
IS 1
BP 98
EP 108
DI 10.1016/j.jsb.2010.01.007
PG 11
WC Biochemistry & Molecular Biology; Biophysics; Cell Biology
SC Biochemistry & Molecular Biology; Biophysics; Cell Biology
GA 578XH
UT WOS:000276329600012
PM 20085819
ER
PT J
AU Moussavi, F
Heitz, G
Amat, F
Comolli, LR
Koller, D
Horowitz, M
AF Moussavi, Farshid
Heitz, Geremy
Amat, Fernando
Comolli, Luis R.
Koller, Daphne
Horowitz, Mark
TI 3D segmentation of cell boundaries from whole cell cryogenic electron
tomography volumes
SO JOURNAL OF STRUCTURAL BIOLOGY
LA English
DT Article
DE Electron tomography; Biomedical image processing; Segmentation; Object
detection; Computer vision; Probabilistic inference
ID IMAGE SEGMENTATION; MOLECULAR-ORGANIZATION; EFFICIENT ALGORITHM; OBJECT
DETECTION; MICROSCOPY; SHAPE; RECONSTRUCTION; TRANSFORM; FIELDS
AB Cryogenic electron tomography (cryo-ET) has gained increasing interest in recent years due to its ability to image whole cells and subcellular structures in 3D at nanometer resolution in their native environment. However, due to dose restrictions and the inability to acquire high tilt angle images, the reconstructed volumes are noisy and have missing information. Thus, features are unreliable, and precision extraction of the cell boundary is difficult, manual and time intensive. This paper presents an efficient recursive algorithm called BLASTED (Boundary Localization using Adaptive Shape and Texture Discovery) to automatically extract the cell boundary using a conditional random field (CRF) framework in which boundary points and shape are jointly inferred. The algorithm learns the texture of the boundary region progressively, and uses a global shape model and shape-dependent features to propose candidate boundary points on a slice of the membrane. It then updates the shape of that slice by accepting the appropriate candidate points using local spatial clustering, the global shape model, and trained boosted texture classifiers. The BLASTED algorithm segmented the cell membrane over an average of 93% of the length of the cell in 19 difficult cryo-ET datasets. (C) 2009 Elsevier Inc. All rights reserved.
C1 [Koller, Daphne; Horowitz, Mark] Stanford Univ, Dept Comp Sci, Stanford, CA 94305 USA.
[Moussavi, Farshid; Heitz, Geremy; Amat, Fernando; Horowitz, Mark] Stanford Univ, Dept Elect Engn, Stanford, CA 94305 USA.
[Comolli, Luis R.] Lawrence Berkeley Natl Labs, Div Life Sci, Berkeley, CA USA.
RP Koller, D (reprint author), Stanford Univ, Dept Comp Sci, Stanford, CA 94305 USA.
EM koller@cs.stanford.edu; horowitz@stanford.edu
NR 54
TC 12
Z9 12
U1 0
U2 4
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 1047-8477
J9 J STRUCT BIOL
JI J. Struct. Biol.
PD APR
PY 2010
VL 170
IS 1
BP 134
EP 145
DI 10.1016/j.jsb.2009.12.015
PG 12
WC Biochemistry & Molecular Biology; Biophysics; Cell Biology
SC Biochemistry & Molecular Biology; Biophysics; Cell Biology
GA 578XH
UT WOS:000276329600016
PM 20035877
ER
PT J
AU Bussmann-Holder, A
Keller, H
de Leon, JM
Simon, A
Bishop, AR
Muller, KA
AF Bussmann-Holder, A.
Keller, H.
Mustre de Leon, J.
Simon, A.
Bishop, A. R.
Mueller, K. A.
TI Testing Polaron Coherence and the Pairing Symmetry in Cuprate
Superconductors by Local Probe Methods
SO JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
LA English
DT Letter
DE Superconductivity; Lattice effects; Polarons
ID HIGH-TEMPERATURE SUPERCONDUCTORS; T-C; AXIAL OXYGEN; LATTICE
FLUCTUATIONS; YBA2CU3O7; ORIGIN; INHOMOGENEITIES; PLANE; STATE; PHASE
AB A variety of local structural probes have demonstrated that local lattice distortions take place in cuprates, which correlate with the onset of the pseudogap phase (PG) and superconductivity (SC). We show here that these lattice responses can be a consequence of polaron formation, local coherence in the pseudogap phase, and global coherence in the superconducting phase. In addition, we demonstrate that the results are consistent with a complex s+d wave order parameter in the SC phase.
C1 [Bussmann-Holder, A.; Simon, A.] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
[Keller, H.; Mueller, K. A.] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland.
[Mustre de Leon, J.] CINVESTAV, Dept Fis, Merida 97310, Yucatan, Mexico.
[Bishop, A. R.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
RP Bussmann-Holder, A (reprint author), Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany.
EM a.bussmann-holder@fkf.mpg.de
NR 36
TC 3
Z9 3
U1 0
U2 5
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1557-1939
J9 J SUPERCOND NOV MAGN
JI J. Supercond. Nov. Magn
PD APR
PY 2010
VL 23
IS 3
BP 295
EP 299
DI 10.1007/s10948-010-0751-7
PG 5
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 561BM
UT WOS:000274950100001
ER
PT J
AU Clayhold, JA
Pelleg, O
Ingram, DC
Bollinger, AT
Logvenov, G
Rench, DW
Kerns, BM
Schroer, MD
Sundling, RJ
Bozovic, I
AF Clayhold, J. A.
Pelleg, O.
Ingram, D. C.
Bollinger, A. T.
Logvenov, G.
Rench, D. W.
Kerns, B. M.
Schroer, M. D.
Sundling, R. J.
Bozovic, I.
TI Constraints on Models of Electrical Transport in Optimally Doped La2-x
Sr (x) CuO4 from Measurements of Radiation-Induced Defect Resistance
SO JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
LA English
DT Article
DE Electrical transport; Resistivity; Cuprate superconductor; High
temperature superconductor; LSCO; Normal state; Ion damage
ID HIGH-TEMPERATURE SUPERCONDUCTOR; SCATTERING
AB Precise measurements of the temperature dependence of additional resistivity caused by defect scattering were used to constrain models of carrier transport in La1.84Sr0.16CuO4. Where previous magnetotransport studies have delineated two distinct scattering processes, proportional to T and T (2), respectively, the new defect scattering results suggest strongly that the two processes act as parallel conductance channels.
C1 [Clayhold, J. A.; Rench, D. W.; Kerns, B. M.; Schroer, M. D.] Miami Univ, Dept Phys, Oxford, OH 45056 USA.
[Pelleg, O.; Bollinger, A. T.; Logvenov, G.; Bozovic, I.] Brookhaven Natl Lab, Upton, NY 11973 USA.
[Ingram, D. C.] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA.
[Sundling, R. J.] ZenSoft Inc, Madison, WI 53705 USA.
RP Clayhold, JA (reprint author), Miami Univ, Dept Phys, Oxford, OH 45056 USA.
EM clayhoja@muohio.edu
RI Schroer, Michael/D-5978-2012;
OI Schroer, Michael/0000-0003-1583-3200; Sundling,
Robert/0000-0002-1380-5321
NR 15
TC 1
Z9 1
U1 0
U2 1
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1557-1939
J9 J SUPERCOND NOV MAGN
JI J. Supercond. Nov. Magn
PD APR
PY 2010
VL 23
IS 3
BP 339
EP 342
DI 10.1007/s10948-009-0580-8
PG 4
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 561BM
UT WOS:000274950100009
ER
PT J
AU Bussmann-Holder, A
Simon, A
Keller, H
Bishop, AR
AF Bussmann-Holder, A.
Simon, A.
Keller, H.
Bishop, A. R.
TI Superconductivity in Fe and As Based Compounds: A Bridge Between MgB2
and Cuprates
SO JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
LA English
DT Article
DE Multiband superconductivity; FeAs based compounds
ID SMFEASO0.8F0.2
AB By interpreting various experimental data for the new high temperature FeAs type superconductors in terms of lattice mediated multigap superconductivity, it is shown that these systems strongly resemble MgB2, however, with the distinction that local polaronic lattice effects exist. This fact establishes a connection to cuprate high temperature superconductors where polaron formation is essential for the pseudogap phase and the unconventional isotope effects observed there. However, similarly to MgB2 and in contrast to cuprates, the two superconducting gaps in the Fe-As based materials are isotropic s-wave gaps.
C1 [Bussmann-Holder, A.; Simon, A.] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
[Keller, H.] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland.
[Bishop, A. R.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Bussmann-Holder, A (reprint author), Max Planck Inst Festkorperforsch, Heisenbergstr 1, D-70569 Stuttgart, Germany.
EM a.bussmann-holder@fkf.mpg.de
NR 52
TC 9
Z9 9
U1 0
U2 11
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1557-1939
J9 J SUPERCOND NOV MAGN
JI J. Supercond. Nov. Magn
PD APR
PY 2010
VL 23
IS 3
BP 365
EP 369
DI 10.1007/s10948-009-0586-2
PG 5
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 561BM
UT WOS:000274950100013
ER
PT J
AU Stojanovic, D
Orlovic, A
Glisic, SB
Markovic, S
Radmilovic, V
Uskokovic, PS
Aleksic, R
AF Stojanovic, D.
Orlovic, A.
Glisic, S. B.
Markovic, S.
Radmilovic, V.
Uskokovic, P. S.
Aleksic, R.
TI Preparation of MEMO silane-coated SiO2 nanoparticles under high pressure
of carbon dioxide and ethanol
SO JOURNAL OF SUPERCRITICAL FLUIDS
LA English
DT Article
DE Supercritical coating; Nanoparticles; Silanization; Supercritical
mixture of carbon dioxide and ethanol; Nanocomposite
ID SUPERCRITICAL CO2; SILICA SURFACES; COUPLING AGENT; PHASE;
ORGANOSILANES; ADSORPTION; STATE
AB The objective of this study is to investigate and compare methods of nanosilica coating with gamma-methacryloxypropyltrimethoxy (MEMO) silane using supercritical carbon dioxide and carbon dioxide-ethanol mixture. Characterization of grafted silane coupling agent on the nanosilica surface was performed by the infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The d(50) value and particle size distribution were determined by laser particle size analyzer (PSA). The operating parameters of silanization process at 40 degrees C, such as the silica/silane weight ratio, the presence of ethanol, and the pressure, were found to be important for the successful coating of silica particles with minimum agglomeration. The results indicate that presence of ethanol in high-pressure carbon dioxide plays an important role in achieving successful deagglomeration of coated nanoparticles. Dynamic mechanical analysis (DMA) and scanning electron microscopy (SEM) revealed that dispersion of the silica particles in the PMMA matrix and interfacial adhesion between silica particles and polymer matrix were enhanced, when silica nanoparticles treated with silane under high pressure of carbon dioxide and ethanol were used for the nanocomposite preparation. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Stojanovic, D.; Orlovic, A.; Glisic, S. B.; Uskokovic, P. S.; Aleksic, R.] Univ Belgrade, Fac Technol & Met, Belgrade 11120, Serbia.
[Markovic, S.] Serbian Acad Arts & Sci, Inst Tech Sci, Belgrade 11000, Serbia.
[Radmilovic, V.] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
RP Orlovic, A (reprint author), Univ Belgrade, Fac Technol & Met, Karnegijeva 4, Belgrade 11120, Serbia.
EM orlovic@tmf.bg.ac.rs
RI Markovic, Smilja/B-7192-2009; Glisic, Sandra/F-7028-2011
OI Markovic, Smilja/0000-0002-9264-4406; Glisic, Sandra/0000-0002-0209-2258
FU Ministry of Science and Technological Development, Republic of Serbia
[142006]; U.S. Department of Energy [DE-AC02-05CH11231]
FX The authors are grateful to the Ministry of Science and Technological
Development, Republic of Serbia for the financial support through the
project 142006. Electron microscopy characterization was performed at
the National Center for Electron Microscopy, Lawrence Berkeley National
Laboratory, supported by the Director. Office of Science, Office of
Basic Energy Sciences, Materials Sciences and Engineering Division, of
the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
NR 33
TC 13
Z9 14
U1 1
U2 18
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0896-8446
J9 J SUPERCRIT FLUID
JI J. Supercrit. Fluids
PD APR
PY 2010
VL 52
IS 3
BP 276
EP 284
DI 10.1016/j.supflu.2010.02.004
PG 9
WC Chemistry, Physical; Engineering, Chemical
SC Chemistry; Engineering
GA 588HA
UT WOS:000277058200005
ER
PT J
AU Manzi, NJ
Chitnis, PV
Holt, RG
Roy, RA
Cleveland, RO
Riemer, B
Wendel, M
AF Manzi, Nicholas J.
Chitnis, Parag V.
Holt, R. Glynn
Roy, Ronald A.
Cleveland, Robin O.
Riemer, Bernie
Wendel, Mark
TI Detecting cavitation in mercury exposed to a high-energy pulsed proton
beam
SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
LA English
DT Article
DE acoustic emission; bubbles; cavitation; mercury (metal); proton effects;
reverberation; shock waves
ID SOLID BOUNDARIES; LITHOTRIPTER; BUBBLES; COLLAPSE; SURFACE; TARGET; ESWL
AB The Oak Ridge National Laboratory Spallation Neutron Source employs a high-energy pulsed proton beam incident on a mercury target to generate short bursts of neutrons. Absorption of the proton beam produces rapid heating of the mercury, resulting in the formation of acoustic shock waves and the nucleation of cavitation bubbles. The subsequent collapse of these cavitation bubbles promote erosion of the steel target walls. Preliminary measurements using two passive cavitation detectors (megahertz-frequency focused and unfocused piezoelectric transducers) installed in a mercury test target to monitor cavitation generated by proton beams with charges ranging from 0.041 to 4.1 mu C will be reported on. Cavitation was initially detected for a beam charge of 0.082 mu C by the presence of an acoustic emission approximately 250 mu s after arrival of the incident proton beam. This emission was consistent with an inertial cavitation collapse of a bubble with an estimated maximum bubble radius of 0.19 mm, based on collapse time. The peak pressure in the mercury for the initiation of cavitation was predicted to be 0.6 MPa. For a beam charge of 0.41 mu C and higher, the lifetimes of the bubbles exceeded the reverberation time of the chamber (similar to 300 mu s), and distinct windows of cavitation activity were detected, a phenomenon that likely resulted from the interaction of the reverberation in the chamber and the cavitation bubbles.
C1 [Manzi, Nicholas J.; Chitnis, Parag V.; Holt, R. Glynn; Roy, Ronald A.; Cleveland, Robin O.] Boston Univ, Dept Mech Engn, Boston, MA 02215 USA.
[Riemer, Bernie; Wendel, Mark] Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA.
RP Manzi, NJ (reprint author), Boston Univ, Dept Mech Engn, 110 Cummington St, Boston, MA 02215 USA.
EM nmanzi@bu.edu
RI Holt, Ray/G-5677-2010; Cleveland, Robin/G-9468-2013;
OI Riemer, Bernard/0000-0002-6922-3056; Roy, Ronald/0000-0001-6394-5667
FU ORNL Spallation Neutron Source; U.S. Department of Energy
[DE-AC05-00OR22725]
FX This work was supported by the ORNL Spallation Neutron Source, which is
managed by University of Tennessee (UT)-Battelle, LLC, under Contract
No. DE-AC05-00OR22725 for the U.S. Department of Energy. The authors
would like to thank the LANL and ORNL staffs, in particular, David Felde
(ORNL), for technical help with the experiments. This work has benefited
from the use of the Los Alamos Neutron Science Center at the Los Alamos
National Laboratory, a facility funded by the U. S. Department of
Energy.
NR 17
TC 7
Z9 7
U1 0
U2 7
PU ACOUSTICAL SOC AMER AMER INST PHYSICS
PI MELVILLE
PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
SN 0001-4966
J9 J ACOUST SOC AM
JI J. Acoust. Soc. Am.
PD APR
PY 2010
VL 127
IS 4
BP 2231
EP 2239
DI 10.1121/1.3353095
PG 9
WC Acoustics; Audiology & Speech-Language Pathology
SC Acoustics; Audiology & Speech-Language Pathology
GA 580DC
UT WOS:000276426100027
PM 20370004
ER
PT J
AU Gordon, T
Shyam, A
Lara-Curzio, E
AF Gordon, Tim
Shyam, Amit
Lara-Curzio, Edgar
TI The Relationship Between Microstructure and Fracture Toughness for
Fibrous Materials for Diesel Particulate Filters
SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY
LA English
DT Article
ID BODIES
AB The Mode I fracture toughness of fibrous SiC and mullite materials with 60%-70% porosity was determined under ambient conditions using the double-torsion test method. The fracture toughness values obtained were 0.27 and 0.34 MPa center dot m1/2 for fibrous SiC and mullite, respectively. These fibrous ceramics exhibit greater fracture resistance than porous monolithic ceramics with similar levels of porosity. A higher degree of cross-linking between the fibers led to further improvement in the fracture characteristics of the fibrous material. The differences in fracture behavior can be explained by the microstructural differences between these two classes of materials. The combination of high porosity and high fracture toughness for fibrous materials makes them ideal candidates for applications in diesel particulate filtration.
C1 [Shyam, Amit; Lara-Curzio, Edgar] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Gordon, Tim] GEO2 Technol Inc, Woburn, MA 01801 USA.
RP Shyam, A (reprint author), Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
EM shyama@ornl.gov
RI Gordon, Timothy/H-9497-2013;
OI Gordon, Timothy/0000-0002-5128-9532; Shyam, Amit/0000-0002-6722-4709
FU U. S. Department of Energy
FX The research at the Oak Ridge National Laboratory's High Temperature
Materials Laboratory was sponsored by the U. S. Department of Energy,
Office of Energy Efficiency and Renewable Energy, Vehicle Technologies
Program.
NR 21
TC 11
Z9 11
U1 0
U2 12
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0002-7820
J9 J AM CERAM SOC
JI J. Am. Ceram. Soc.
PD APR
PY 2010
VL 93
IS 4
BP 1120
EP 1126
DI 10.1111/j.1551-2916.2009.03524.x
PG 7
WC Materials Science, Ceramics
SC Materials Science
GA 577TK
UT WOS:000276246700040
ER
PT J
AU Laskin, J
Yang, ZB
Ng, CMD
Chu, IK
AF Laskin, Julia
Yang, Zhibo
Ng, C. M. Dominic
Chu, Ivan K.
TI Fragmentation of alpha-Radical Cations of Arginine-Containing Peptides
SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
LA English
DT Article
ID TANDEM MASS-SPECTROMETRY; ELECTRON-CAPTURE DISSOCIATION;
COLLISION-INDUCED DISSOCIATION; GAS-PHASE; DETACHMENT DISSOCIATION;
PROTON-TRANSFER; COMPLEXES; IONS; GENERATION; BACKBONE
AB Fragmentation pathways of peptide radical cations, M-H, with well-defined initial location of the radical site were explored using collision-induced dissociation (CID) experiments. Peptide radical cations were produced by gas-phase fragmentation of Con(III)(salen)-peptide complexes [salen = N,N'-ethylenebis (salicylideneiminato)]. Subsequent hydrogen abstraction from the beta-carbon of the side-chain followed by C alpha-C beta bond cleavage results in the loss of a neutral side chain and formation of an a-radical cation with the radical site localized on the a-carbon of the backbone. Similar CID spectra dominated by radical-driven dissociation products were obtained for a number of arginine-containing a-radicals, suggesting that for these systems radical migration precedes fragmentation. In contrast, proton-driven fragmentation dominates CID spectra of a-radicals produced via the loss of the arginine side chain. Radicaldriven fragmentation of large M(+). peptide radical cations is dominated by side-chain losses, formation of even-electron a-ions and odd-electron x-ions resulting from C alpha-C bond cleavages, formation of odd-electron z-ions, and loss of the N-terminal residue. In contrast, charge-driven fragmentation produces even-electron y-ions and odd-electron b-ions. (J Am Soc Mass Spectrom 2010, 21, 511-521) (C) 2010 American Society for Mass Spectrometry
C1 [Laskin, Julia; Yang, Zhibo] Pacific NW Natl Lab, Chem & Mat Sci Div, Richland, WA 99352 USA.
[Ng, C. M. Dominic; Chu, Ivan K.] Univ Hong Kong, Dept Chem, Hong Kong, Hong Kong, Peoples R China.
RP Laskin, J (reprint author), Pacific NW Natl Lab, Chem & Mat Sci Div, POB 999,K-88, Richland, WA 99352 USA.
EM Julia.Laskin@pnl.gov
RI Yang, Zhibo/E-4088-2010; Laskin, Julia/H-9974-2012
OI Laskin, Julia/0000-0002-4533-9644
FU US DOE; University of Hong Kong
FX The authors acknowledge partial support for this study by a grant from
the Chemical Sciences Division, Office of Basic Energy Sciences of the
US DOE and partially by the University of Hong Kong and Hong Kong
Research Grant Council, Special Administrative Region, China (project
nos. 7018/06P and 7012/08P). The research described in this manuscript
was performed at the W. R. Wiley Environmental Molecular Sciences
Laboratory (EMSL), a national scientific user facility sponsored by the
U.S. Department of Energy's Office of Biological and Environmental
Research and located at Pacific Northwest National Laboratory (PNNL).
PNNL is operated by Battelle for the U.S. Department of Energy. I.K.C.
acknowledges participation in the PNNL Interfacial and Condensed Phase
Summer Research Institute.
NR 60
TC 33
Z9 33
U1 1
U2 15
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 1044-0305
J9 J AM SOC MASS SPECTR
JI J. Am. Soc. Mass Spectrom.
PD APR
PY 2010
VL 21
IS 4
BP 511
EP 521
DI 10.1016/j.jasms.2009.12.021
PG 11
WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy
SC Chemistry; Spectroscopy
GA 584XX
UT WOS:000276788700003
PM 20138543
ER
PT J
AU Park, J
Babzien, M
Kusche, K
Yakimenko, V
AF Park, J.
Babzien, M.
Kusche, K.
Yakimenko, V.
TI Experimentally Reducing the Dilution of the Beam Emittance Caused by
Misalignments in a Photoinjector
SO JOURNAL OF THE KOREAN PHYSICAL SOCIETY
LA English
DT Article
DE Photoinjector; Emittance dilution; rf deflection force; Misalignments;
Electron beam
ID DESIGN
AB A major issue in generating a high-brightness electron beam is preserving the beam's emittance. Here, we discuss one possible source of diluting emittance, viz., misalignment of the rf kick. The status of alignments due to the deflection force of the accelerating field affects the emittance of a high-brightness electron beam from a photoinjector. An electron beam misaligned with the axis of the accelerating field experiences an emittance growth caused by a defection that is proportional to the electric field's strength in the cavity with the extent of the misalignment. Misalignments of the beam's axis induce different deflections on each particle in the beam, resulting in an energy spread, and, consequently, diluting the beam's emittance. If such a dilution is to be reduced, all components of the photoinjector must be aligned carefully. We measured the emittance dilution and compared the findings with those from our PARMELA. simulation; there was good agreement between them. We demonstrated a significant reduction in the degradation of the emittance as misalignments in the system were rectified.
C1 [Park, J.; Babzien, M.; Kusche, K.; Yakimenko, V.] Brookhaven Natl Lab, Accelerator Test Facil, Upton, NY 11973 USA.
[Park, J.] Adv Energy Syst Inc, Medford, NY 11763 USA.
RP Park, J (reprint author), Brookhaven Natl Lab, Accelerator Test Facil, Upton, NY 11973 USA.
EM Jangho_park@mail.aesys.net
FU US Department of Energy
FX This work was supported by the US Department of Energy. The authors are
grateful to the Accelerator Test Facility (ATF) staff for their
assistance and support.
NR 16
TC 0
Z9 0
U1 0
U2 1
PU KOREAN PHYSICAL SOC
PI SEOUL
PA 635-4, YUKSAM-DONG, KANGNAM-KU, SEOUL 135-703, SOUTH KOREA
SN 0374-4884
J9 J KOREAN PHYS SOC
JI J. Korean Phys. Soc.
PD APR
PY 2010
VL 56
IS 4
BP 1074
EP 1078
DI 10.3938/jkps.56.1074
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 584VZ
UT WOS:000276783000007
ER
PT J
AU Wang, H
Wu, PD
Tome, CN
Huang, Y
AF Wang, H.
Wu, P. D.
Tome, C. N.
Huang, Y.
TI A finite strain elastic-viscoplastic self-consistent model for
polycrystalline materials
SO JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
LA English
DT Article
DE Crystal plasticity; Finite strain; Polycrystalline material;
Elastic-viscoplastic material; Self-consistent
ID TIME-DEPENDENT CREEP; CRYSTALLOGRAPHIC TEXTURE EVOLUTION; SITU
NEUTRON-DIFFRACTION; MAGNESIUM ALLOY AZ31B; PLASTIC-DEFORMATION;
ZIRCONIUM ALLOYS; VISCOELASTIC POLYCRYSTALS; RESIDUAL-STRESSES;
SINGLE-CRYSTALS; FCC METALS
AB A large strain elastic-viscoplastic self-consistent (EVPSC) model for polycrystalline materials is developed. At single crystal level, both the rate sensitive slip and twinning are included as the plastic deformation mechanisms, while elastic anisotropy is accounted for in the elastic moduli. The transition from single crystal plasticity to polycrystal plasticity is based on a completely self-consistent approach. It is shown that the differences in the predicted stress-strain curves and texture evolutions based on the EVPSC and the viscoplastic self-consistent (VPSC) model proposed by Lebensohn and Tome (1993) are negligible at large strains for monotonic loadings. For the deformations involving unloading and strain path changes, the EVPSC predicts a smooth elasto-plastic transition, while the VPSC model gives a discontinuous response due to lack of elastic deformation. It is also demonstrated that the EVPSC model can capture some important experimental features which cannot be simulated by using the VPSC model. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Wang, H.; Wu, P. D.] McMaster Univ, Dept Mech Engn, Hamilton, ON L8S 4L7, Canada.
[Tome, C. N.] Los Alamos Natl Lab, Ctr Mat Sci, Los Alamos, NM 87545 USA.
[Huang, Y.] Northwestern Univ, Dept Civil & Environm Engn, Evanston, IL 61208 USA.
[Huang, Y.] Northwestern Univ, Dept Mech Engn, Evanston, IL 61208 USA.
RP Wu, PD (reprint author), McMaster Univ, Dept Mech Engn, Hamilton, ON L8S 4L7, Canada.
EM peidong@mcmaster.ca
RI Wang, Huamiao/F-7693-2010; Tome, Carlos/D-5058-2013; Huang,
Yonggang/B-6998-2009; Wu, Peidong/A-7009-2008
OI Wang, Huamiao/0000-0002-7167-2483;
FU NSERC Magnesium Strategic Research Network
FX This research was supported by funding from the NSERC Magnesium
Strategic Research Network. More information on the Network can be found
at www.MagNET.ubc.ca.
NR 67
TC 92
Z9 95
U1 5
U2 68
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0022-5096
J9 J MECH PHYS SOLIDS
JI J. Mech. Phys. Solids
PD APR
PY 2010
VL 58
IS 4
BP 594
EP 612
DI 10.1016/j.jmps.2010.01.004
PG 19
WC Materials Science, Multidisciplinary; Mechanics; Physics, Condensed
Matter
SC Materials Science; Mechanics; Physics
GA 576TL
UT WOS:000276171400010
ER
PT J
AU Huang, XR
Peng, RW
AF Huang, Xian-Rong
Peng, Ru-Wen
TI General mechanism involved in subwavelength optics of conducting
microstructures: charge-oscillation-induced light emission and
interference
SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND
VISION
LA English
DT Article
ID EVANESCENT-WAVE MODEL; METALLIC GRATINGS; TRANSMISSION RESONANCES;
SURFACE-PLASMONS; HOLE ARRAYS; SLITS; RESONATORS; FIELD
AB Interactions between light and conducting microstructures or nanostructures can result in a variety of novel phenomena, but their underlying mechanisms have not been completely understood. From calculations of surface charge density waves on conducting gratings and by comparing them with classical surface plasmons, we revealed a general yet concrete picture regarding the coupling of light to free electron oscillation on structured conducting surfaces that can lead to oscillating subwavelength charge patterns (i.e., structured surface plasmons). New wavelets emitted from these light sources then destructively interfere to form evanescent waves. This principle, usually combined with other mechanisms, is mainly a geometrical effect that can be universally involved in light scattering from all periodic and non-periodic structures containing free electrons. This picture may provide clear guidelines for developing conductor-based nano-optical devices. (c) 2010 Optical Society of America
C1 [Huang, Xian-Rong] Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA.
[Huang, Xian-Rong] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[Peng, Ru-Wen] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China.
RP Huang, XR (reprint author), Brookhaven Natl Lab, Natl Synchrotron Light Source 2, Upton, NY 11973 USA.
EM xiahuang@aps.anl.gov
FU National Science Foundation of China (NSFC) [10625417, 50672035,
10874068]; Ministry of Science and Technology of China (MOST)
[2004CB619005, 2006CB921804]; Ministry of Education of China (ME) and
Jiangsu Province [NCET-05-0440, BK2008012]; U.S. Department of Energy,
Office of Science, Office of Basic Energy Sciences [DEAC-02-98CH10886,
DE-AC-02-06CH11357]
FX This work was supported by grants from the National Science Foundation
of China (NSFC) (Grant Nos. 10625417, 50672035, and 10874068), the
Ministry of Science and Technology of China (MOST) (Grant Nos.
2004CB619005 and 2006CB921804), and partly by the Ministry of Education
of China (ME) and Jiangsu Province (Grant Nos. NCET-05-0440 and
BK2008012). X. R. H was supported by the U.S. Department of Energy,
Office of Science, Office of Basic Energy Sciences, under Contract Nos.
DEAC-02-98CH10886 and DE-AC-02-06CH11357. We thank Yong Q. Cai for
helpful discussions.
NR 40
TC 16
Z9 16
U1 4
U2 11
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1084-7529
J9 J OPT SOC AM A
JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis.
PD APR
PY 2010
VL 27
IS 4
BP 718
EP 729
PG 12
WC Optics
SC Optics
GA 577PM
UT WOS:000276236300006
PM 20360814
ER
PT J
AU Gallis, MA
Bond, RB
Torczynski, JR
AF Gallis, Michael A.
Bond, Ryan B.
Torczynski, John R.
TI Assessment of Collisional-Energy-Based Models for Atmospheric Species
Reactions in Hypersonic Flows
SO JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
LA English
DT Article
ID MONTE-CARLO METHOD; TRAJECTORY CALCULATIONS; CHEMICAL-REACTIONS;
DISSOCIATION; EXCHANGE
AB A recently proposed set of direct simulation Monte Carlo chemical reaction models, based solely on the collisional energy and the vibrational energy levels of the species involved, is applied to calculate equilibrium and nonequilibrium chemical reaction rates for atmospheric reactions in hypersonic flows. The direct simulation Monte Carlo model predictions are in good agreement with Park's model, several theoretical models, and experimental measurements. Physically plausible modifications to some of the direct simulation Monte Carlo models are presented that improve agreement. The observed agreement provides strong evidence that modeling of chemical reactions based on collisional energy and vibrational energy levels provides an accurate method for predicting equilibrium and nonequilibrium chemical reaction rates.
C1 [Gallis, Michael A.; Bond, Ryan B.; Torczynski, John R.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Gallis, MA (reprint author), Sandia Natl Labs, POB 5800,Mail Stop 0346, Albuquerque, NM 87185 USA.
FU U.S. Department of Energy's National Nuclear Security Administration
[DE-AC04-94AL85000]
FX This work was performed at Sandia National Laboratories. Sandia is a
multiprogram laboratory operated by Sandia Corporation, a Lockheed
Martin Corporation, for the U.S. Department of Energy's National Nuclear
Security Administration under contract DE-AC04-94AL85000.
NR 26
TC 6
Z9 6
U1 0
U2 0
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0887-8722
J9 J THERMOPHYS HEAT TR
JI J. Thermophys. Heat Transf.
PD APR-JUN
PY 2010
VL 24
IS 2
BP 241
EP 253
DI 10.2514/1.46267
PG 13
WC Thermodynamics; Engineering, Mechanical
SC Thermodynamics; Engineering
GA 588TG
UT WOS:000277096200002
ER
PT J
AU Wahl, JH
Bolz, CD
Wahl, KL
AF Wahl, Jon H.
Bolz, Cinnamon D.
Wahl, Karen L.
TI Investigating Solvent Purity Using Comprehensive Gas Chromatography: A
Study of Acetones
SO LC GC EUROPE
LA English
DT Article
ID GC X GC; ENVIRONMENTAL-SAMPLES; SOXHLET EXTRACTION
AB Broad spectrum chemical analysis of trace level components is a continuing challenge for any analytical chemist. This challenge is further confounded when chemical impurities may be present in common organic solvents or when chemical artifacts may be formed, produced and introduced during an analytical procedure. Minimizing and understanding these chemical artifacts is critical for trace level detection and is crucial for accurate analytical conclusions. Comprehensive gas chromatography is an excellent analytical tool to help address these complex mixture challenges. This work examines the impurities present in a variety of acetone sources using comprehensive gas chromatography. This work highlights the extreme variability possible in solvent sources and hence the importance of understanding the impurities that may confound an analytical method or result.
C1 [Wahl, Jon H.; Bolz, Cinnamon D.; Wahl, Karen L.] Pacific NW Natl Lab, Chem & Biol Signature Sci Grp, Richland, WA 99352 USA.
RP Wahl, JH (reprint author), Pacific NW Natl Lab, Chem & Biol Signature Sci Grp, Richland, WA 99352 USA.
FU United States Department of Homeland Security, Science and Technology
Directorate [AGRHSHDC07X00451]
FX Funding for this work was provided through contract AGRHSHDC07X00451 to
Pacific Northwest National Laboratory by the United States Department of
Homeland Security, Science and Technology Directorate.
NR 9
TC 3
Z9 3
U1 1
U2 5
PU ADVANSTAR COMMUNICATIONS INC
PI WOODLAND HILLS
PA 6200 CANOGA AVE, 2ND FLR, WOODLAND HILLS, CA 91367 USA
SN 1471-6577
J9 LC GC EUR
JI LC GC Eur.
PD APR
PY 2010
VL 23
IS 4
BP 188
EP +
PG 7
WC Chemistry, Analytical
SC Chemistry
GA 601GI
UT WOS:000278045900001
ER
PT J
AU Hong-Geller, E
Valdez, YE
Shou, Y
Yoshida, TM
Marrone, BL
Dunbar, JM
AF Hong-Geller, E.
Valdez, Y. E.
Shou, Y.
Yoshida, T. M.
Marrone, B. L.
Dunbar, J. M.
TI Evaluation of Bacillus anthracis and Yersinia pestis sample collection
from nonporous surfaces by quantitative real-time PCR
SO LETTERS IN APPLIED MICROBIOLOGY
LA English
DT Article
DE Bacillus anthracis; bioforensics; nonporous surfaces; qPCR; sample
collection; Yersinia pestis
ID ENVIRONMENTAL SURFACES; IMPLANT INFECTIONS; BIOFILM; SPORES;
BIOTERRORISM; SURVIVAL; BACTERIA; ADHESION; WARFARE; PLASMID
AB Aim:
We will validate sample collection methods for recovery of microbial evidence in the event of accidental or intentional release of biological agents into the environment.
Methods and Results:
We evaluated the sample recovery efficiencies of two collection methods - swabs and wipes - for both nonvirulent and virulent strains of Bacillus anthracis and Yersinia pestis from four types of nonporous surfaces: two hydrophilic surfaces, stainless steel and glass, and two hydrophobic surfaces, vinyl and plastic. Sample recovery was quantified using real-time qPCR to assay for intact DNA signatures. We found no consistent difference in collection efficiency between swabs or wipes. Furthermore, collection efficiency was more surface-dependent for virulent strains than nonvirulent strains. For the two nonvirulent strains, collection efficiency was similar between all four surfaces, albeit B. anthracis Sterne exhibited higher levels of recovery compared to Y. pestis A1122. In contrast, recovery of B. anthracis Ames spores and Y. pestis CO92 from the hydrophilic glass or stainless steel surfaces was generally more efficient compared to collection from the hydrophobic vinyl and plastic surfaces.
Conclusions:
Our results suggest that surface hydrophobicity may play a role in the strength of pathogen adhesion. The surface-dependent collection efficiencies observed with the virulent strains may arise from strain-specific expression of capsular material or other cell surface receptors that alter cell adhesion to specific surfaces.
Significance and Impact of the Study:
These findings contribute to the validation of standard bioforensics procedures and emphasize the importance of specific strain and surface interactions in pathogen detection.
C1 [Hong-Geller, E.; Valdez, Y. E.; Shou, Y.; Yoshida, T. M.; Marrone, B. L.; Dunbar, J. M.] Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA.
RP Hong-Geller, E (reprint author), Los Alamos Natl Lab, Biosci Div, POB 1663, Los Alamos, NM 87545 USA.
EM ehong@lanl.gov
OI Yoshida, Thomas/0000-0002-2333-7904
FU Department of Homeland Security, Science and Technology Directorate
FX This work was supported by the Department of Homeland Security, Science
and Technology Directorate. All authors state that there are no
conflicts of interest.
NR 21
TC 9
Z9 9
U1 0
U2 4
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0266-8254
J9 LETT APPL MICROBIOL
JI Lett. Appl. Microbiol.
PD APR
PY 2010
VL 50
IS 4
BP 431
EP 437
DI 10.1111/j.1472-765X.2010.02821.x
PG 7
WC Biotechnology & Applied Microbiology; Microbiology
SC Biotechnology & Applied Microbiology; Microbiology
GA 566TO
UT WOS:000275396300017
PM 20184669
ER
PT J
AU Tsao, JY
Waide, P
AF Tsao, Jeffrey Y.
Waide, Paul
TI The World's Appetite for Light: Empirical Data and Trends Spanning Three
Centuries and Six Continents
SO LEUKOS
LA English
DT Article
DE Solid-state lighting; Rebound effect; Energy efficiency; Price
elasticity; Income elasticity; Global lighting demand
ID ENERGY EFFICIENCY
AB We have collected and self-consistently analyzed data for per-capita consumption of artificial light, per-capita gross domestic product, and ownership cost of light. The data span a wide range (three centuries, six continents, five lighting technologies, and five orders of magnitude), and are consistent with a linear variation of percapita consumption of light with the ratio between per-capita gross domestic product and ownership cost of light. No empirical evidence is found for a saturation in per-capita consumption of light, even in contemporary developed nations. Finally, we extrapolate to the world in 2005, and find that 0.72 percent ($437B/year) of world gross domestic product and 6.5 percent (29.5 Quads/year) of world primary energy was used to produce 130 Plmh/year of artificial light.
C1 [Tsao, Jeffrey Y.] Sandia Natl Labs, Phys Chem & Nano Sci Ctr, Albuquerque, NM 87185 USA.
Int Energy Agcy, Energy Efficiency & Environm Div, F-75739 Paris 15, France.
RP Tsao, JY (reprint author), Sandia Natl Labs, Phys Chem & Nano Sci Ctr, POB 5800, Albuquerque, NM 87185 USA.
EM jytsao@sandia.gov
FU Sandia's Solid-State-Lighting Science Energy Frontier Research Center;
U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences. Sandia [DE-AC04-94AL85000]
FX Work at Sandia National Laboratories was supported by Sandia's
Solid-State-Lighting Science Energy Frontier Research Center, funded by
the U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences. Sandia is a multiprogram laboratory operated by Sandia
Corporation, a Lockheed Martin Company, for the United States Department
of Energy's National Nuclear Security Administration under Contract No.
DE-AC04-94AL85000.
NR 48
TC 18
Z9 18
U1 1
U2 9
PU ILLUMINAT ENG SOC NORTH AMER
PI NEW YORK
PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 USA
SN 1550-2724
J9 LEUKOS
JI Leukos
PD APR
PY 2010
VL 6
IS 4
BP 259
EP 281
DI 10.1582/LEUKOS.2010.06.04001
PG 23
WC Construction & Building Technology; Optics
SC Construction & Building Technology; Optics
GA 600WC
UT WOS:000278018600002
ER
PT J
AU Zhang, XH
Li, XD
Mara, N
Zhu, YT
Minor, A
Huang, R
AF Zhang, Xinghang
Li, Xiaodong
Mara, Nathan
Zhu, Yuntian
Minor, Andrew
Huang, Rui
TI "Mechanical Behavior of Nanostructured Materials"
SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND
MATERIALS SCIENCE
LA English
DT Editorial Material
C1 [Zhang, Xinghang] Texas A&M Univ, College Stn, TX 77843 USA.
[Li, Xiaodong] Univ S Carolina, Columbia, SC 29208 USA.
[Mara, Nathan] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Zhu, Yuntian] N Carolina State Univ, Raleigh, NC 27695 USA.
[Minor, Andrew] Univ Calif Berkeley, Berkeley, CA 94720 USA.
[Minor, Andrew] Lawrence Berkeley Natl Lab, Berkeley, CA USA.
RP Zhang, XH (reprint author), Texas A&M Univ, College Stn, TX 77843 USA.
EM zhangx@tamu.edu
RI Huang, Rui/B-1627-2008; Mara, Nathan/J-4509-2014;
OI Huang, Rui/0000-0003-0328-3862; Mara, Nathan/0000-0002-9135-4693
NR 0
TC 0
Z9 0
U1 0
U2 5
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1073-5623
J9 METALL MATER TRANS A
JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.
PD APR
PY 2010
VL 41A
IS 4
BP 777
EP 777
DI 10.1007/s11661-010-0205-7
PG 1
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 567KI
UT WOS:000275445100001
ER
PT J
AU Lee, Z
Radmilovic, V
Ahn, B
Lavernia, EJ
Nutt, SR
AF Lee, Zonghoon
Radmilovic, Velimir
Ahn, Byungmin
Lavernia, Enrique J.
Nutt, Steven R.
TI Tensile Deformation and Fracture Mechanism of Bulk Bimodal
Ultrafine-Grained Al-Mg Alloy
SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND
MATERIALS SCIENCE
LA English
DT Article; Proceedings Paper
CT Symposium on Mechanical Behavior of Nanostructured Materials held at the
2009 TMS Annual Meeting and Exhibition
CY FEB 15-19, 2009
CL San Francisco, CA
SP Mech Behav Mat Comm, Structural Mat Div, Nanomech Mat Comm, Mfg & Proc Mat Div, Chem & Phys Mat Comm, Structural Mat & Elect, Magnetic & Photon Mat Div, Hysitron Inc, Allied High Tech Inc, FEI
ID BRITTLE MATERIALS; DUCTILITY; MICROSTRUCTURE; STRENGTH; BEHAVIOR;
METALS; SIZE
AB The tensile fractures of ultrafine-grained (UFG) Al-Mg alloy with a bimodal grain size were investigated at the micro- and macroscale using transmission electron microscopy (TEM), scanning electron microscopy (SEM) equipped with focused ion beam (FIB), and optical microscopy. The nanoscale voids and crack behaviors near the tensile fracture surfaces were revealed in various scale ranges and provided the evidence to determine the underlying tensile deformation and fracture mechanisms associated with the bulk bimodal metals. The bimodal grain structures exhibit unusual deformation and fracture mechanisms similar to ductile-phase toughening of brittle materials. The ductile coarse grains in the UFG matrix effectively impede propagation of microcracks, resulting in enhanced ductility and toughness while retaining high strength. In view of the observations collected, we propose a descriptive model for tensile deformation and fracture of bimodal UFG metals.
C1 [Radmilovic, Velimir] Univ Calif Berkeley, Lawrence Berkeley Lab, NCEM, Berkeley, CA 94720 USA.
[Ahn, Byungmin; Nutt, Steven R.] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA.
[Lavernia, Enrique J.] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA.
EM zhlee@lbl.gov
RI Ahn, Byungmin/B-3845-2010; Lee, Zonghoon/G-1474-2011; Lavernia,
Enrique/I-6472-2013
OI Ahn, Byungmin/0000-0002-0866-6398; Lee, Zonghoon/0000-0003-3246-4072;
Lavernia, Enrique/0000-0003-2124-8964
NR 16
TC 36
Z9 39
U1 0
U2 22
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1073-5623
J9 METALL MATER TRANS A
JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.
PD APR
PY 2010
VL 41A
IS 4
BP 795
EP 801
DI 10.1007/s11661-009-0007-y
PG 7
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 567KI
UT WOS:000275445100004
ER
PT J
AU Zhang, JN
Ma, Z
Jiao, J
Yin, HF
Yan, WF
Hagaman, EW
Yu, JH
Dai, S
AF Zhang, Jianan
Ma, Zhen
Jiao, Jian
Yin, Hongfeng
Yan, Wenfu
Hagaman, Edward W.
Yu, Jihong
Dai, Sheng
TI Surface functionalization of mesoporous silica SBA-15 by liquid-phase
grafting of zirconium phosphate
SO MICROPOROUS AND MESOPOROUS MATERIALS
LA English
DT Article
DE Surface functionalization; Grafting; Mesoporous silica; SBA-15;
Zirconium phosphate; Aluminum phosphate; Solid acid
ID TITANIUM PHOSPHATE; CATALYTIC-PROPERTIES; SULFATED ZIRCONIA; ACIDIC
PROPERTIES; MOLECULAR-SIEVES; MESOSTRUCTURED TITANIUM; ASSISTED
SYNTHESIS; THERMAL-STABILITY; METAL PHOSPHATES; MCM-41 SILICA
AB The introduction of mesoporous silicas in the 1990s has offered new opportunities for the engineering of ordered catalytic nanoreactors, but the acid properties of mesoporous silicas are rather poor. Herein mesoporous silica (SBA-15) surfaces were functionalized by zirconium phosphate via two methods recently developed in our group. Zr(OPr)(4) and POCl(3) were used as appropriate precursors in both methods. The main difference between these methods lies in whether Zr(OPr)(4) is grafted onto SBA-15 first and POCl(3) second (method 1) or the grafting process takes place in one pot, with SBA-15, Zr(OPr)(4), and POCl(3) altogether (method 2). More zirconium phosphate could be grafted by repeating the above procedures. The materials were characterized by ICP-OES, XRD, N(2) adsorption-desorption, TEM, (31)P and (29)Si MAS NMR, and NH(3)-TPD, and their applications in catalytic isopropanol dehydration, cumene cracking, and metalion adsorption were demonstrated. Aluminum phosphate-modified SBA-15 samples could be obtained via these two methods as well. This work enriches the family of metal phosphate-functionalized mesaporous silicas as new solid acid catalysts. Published by Elsevier Inc.
C1 [Zhang, Jianan; Ma, Zhen; Jiao, Jian; Yin, Hongfeng; Hagaman, Edward W.; Dai, Sheng] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA.
[Zhang, Jianan; Yan, Wenfu; Yu, Jihong] Jilin Univ, State Key Lab Inorgan Synth & Preparat Chem, Coll Chem, Changchun 130012, Peoples R China.
RP Ma, Z (reprint author), Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA.
EM zhen.ma@email.ucr.edu; dais@ornl.gov
RI Ma, Zhen/F-1348-2010; yu, jihong/C-1381-2011; Dai, Sheng/K-8411-2015
OI Ma, Zhen/0000-0002-2391-4943; yu, jihong/0000-0003-1991-2942; Dai,
Sheng/0000-0002-8046-3931
FU Division of Chemical Sciences, Office of Basic Energy Sciences, US
Department of Energy [DE-AC05-00OR22725]; National Natural Science
Foundation of China; State Basic Research Project [973]; ORNL Research
Associates Program
FX S. Dai thanks the Division of Chemical Sciences, Office of Basic Energy
Sciences, US Department of Energy under contract DE-AC05-00OR22725 with
Oak Ridge National Laboratory, managed and operated by UT-Battelle, LLC.
J.H. Yu thanks the grants provided by National Natural Science
Foundation of China and the State Basic Research Project (973) of China.
This research was also supported by the appointment for Z. Ma, J. Jiao,
and H.F. Yin to the ORNL Research Associates Program, administered by
Oak Ridge Associated Universities.
NR 71
TC 19
Z9 20
U1 2
U2 40
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1387-1811
J9 MICROPOR MESOPOR MAT
JI Microporous Mesoporous Mat.
PD APR 1
PY 2010
VL 129
IS 1-2
BP 200
EP 209
DI 10.1016/j.micromeso.2009.09.016
PG 10
WC Chemistry, Applied; Chemistry, Physical; Nanoscience & Nanotechnology;
Materials Science, Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 547CK
UT WOS:000273862900026
ER
PT J
AU Leng, YS
Lei, YJ
Cummings, PT
AF Leng, Yongsheng
Lei, Yajie
Cummings, Peter T.
TI Comparative studies on the structure and diffusion dynamics of aqueous
and nonpolar liquid films under nanometers confinement
SO MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
LA English
DT Article
ID MOLECULARLY THIN-LAYERS; HYDRATION FORCES; MICA SURFACES;
ELECTROLYTE-SOLUTIONS; PHASE-TRANSITIONS; SOLVATION FORCES; WATER
AB Aqueous hydration water confined between two mica surfaces and nonpolar liquid argon confined between two solid crystals have been comparably studied through molecular dynamics simulations. A liquid-vapor molecular ensemble developed in previous studies (Leng 2008 J. Phys.: Condens. Matter 20 354017) has been used to investigate the solvation structures and diffusion dynamics of confined films. We find that water always tends to diffuse even under two-layer extreme confinement (D = 0.73 nm), whereas liquid argon undergoes a spontaneous liquid-to-solid phase transition at an appreciable large distance (n = 9 layers) between the two crystal solids. Vacancy diffusion in the solid phase of argon is observed. We attribute this phase transition of argon to the tendency of argon molecules to form a close-packed structure to maximize the cohesion energy contributed from weak van der Waals attractions.
C1 [Leng, Yongsheng; Lei, Yajie] George Washington Univ, Dept Mech & Aerosp Engn, Washington, DC 20052 USA.
[Cummings, Peter T.] Vanderbilt Univ, Dept Chem & Biomol Engn, Nashville, TN 37235 USA.
[Cummings, Peter T.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Nanomat Theory Inst, Oak Ridge, TN 37831 USA.
RP Leng, YS (reprint author), George Washington Univ, Dept Mech & Aerosp Engn, Washington, DC 20052 USA.
EM leng@gwu.edu
RI Cummings, Peter/B-8762-2013
OI Cummings, Peter/0000-0002-9766-2216
FU National Science Foundation (NSF) [CMMI 0904287]; US Department of
Defense (DoD) Air Force Office of Scientific Research (AFOSR); National
Energy Research Scientific Computing Center (NERSC)
FX This work is supported by the National Science Foundation (NSF) CMMI
0904287, the US Department of Defense (DoD) Air Force Office of
Scientific Research (AFOSR) and the National Energy Research Scientific
Computing Center (NERSC).
NR 26
TC 6
Z9 6
U1 0
U2 8
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0965-0393
J9 MODEL SIMUL MATER SC
JI Model. Simul. Mater. Sci. Eng.
PD APR
PY 2010
VL 18
IS 3
AR 034007
DI 10.1088/0965-0393/18/3/034007
PG 12
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 573HD
UT WOS:000275898900008
ER
PT J
AU Lorenz, CD
Chandross, M
Lane, JMD
Grest, GS
AF Lorenz, Christian D.
Chandross, Michael
Lane, J. Matthew D.
Grest, Gary S.
TI Nanotribology of water confined between hydrophilic alkylsilane
self-assembled monolayers
SO MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
LA English
DT Article
ID MOLECULAR-DYNAMICS SIMULATIONS; TRIBOLOGICAL PROPERTIES;
COMPUTER-SIMULATION; PHASE-TRANSITIONS; FORCE MICROSCOPY; THIN-LAYERS;
FILMS; SURFACES; MEMS; VISCOSITY
AB We report the results of large-scale molecular dynamics simulations of water confined between alkylsilane Si(OH)(3)(CH(2))(10)COOH self-assembled monolayers (SAMs) on an amorphous silica substrate. The structure and dynamics of the confined water are studied for applied pressures ranging from approximately 50 to 400 MPa. The viscosity and microscopic friction of the confined water are determined from steady-state shear simulations. We find that the viscosity of the water increases only slightly compared with bulk water under comparable pressures. There is no evidence of ice-like layers being formed near the COOH end groups of the SAMs. The microscopic friction coefficients could only be calculated at high shear rates due to the low viscosity of the water and are found to decrease with increasing amounts of water, similar to experiment.
C1 [Lorenz, Christian D.] Kings Coll London, Dept Phys, Mat & Mol Modeling Grp, London WC2R 2LS, England.
[Chandross, Michael; Lane, J. Matthew D.; Grest, Gary S.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Lorenz, CD (reprint author), Kings Coll London, Dept Phys, Mat & Mol Modeling Grp, London WC2R 2LS, England.
EM chris.lorenz@kcl.ac.uk
RI Lorenz, Christian/A-6996-2017
OI Lorenz, Christian/0000-0003-1028-4804
FU US Department of Energy [DE-AC04-94AL85000]; Center for Integrated
Nanotechnologies, at Los Alamos National Laboratory [DE-AC52-06NA25396];
Sandia National Laboratories [DE-AC04-94AL85000]
FX CL acknowledges the KCL Division of Engineering Start-Up funds for
supporting this project. Sandia is a multiprogram laboratory operated by
Sandia Corporation, a Lockheed Martin Company, for the United States
Department of Energy under contract DE-AC04-94AL85000. This work was
performed in part at the US Department of Energy, Center for Integrated
Nanotechnologies, at Los Alamos National Laboratory (Contract
DE-AC52-06NA25396) and Sandia National Laboratories (Contract
DE-AC04-94AL85000).
NR 55
TC 13
Z9 13
U1 2
U2 23
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0965-0393
J9 MODEL SIMUL MATER SC
JI Model. Simul. Mater. Sci. Eng.
PD APR
PY 2010
VL 18
IS 3
AR 034005
DI 10.1088/0965-0393/18/3/034005
PG 13
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 573HD
UT WOS:000275898900006
ER
PT J
AU Bowman, GR
Comolli, LR
Gaietta, GM
Fero, M
Hong, SH
Jones, Y
Lee, JH
Downing, KH
Ellisman, MH
McAdams, HH
Shapiro, L
AF Bowman, Grant R.
Comolli, Luis R.
Gaietta, Guido M.
Fero, Michael
Hong, Sun-Hae
Jones, Ying
Lee, Julie H.
Downing, Kenneth H.
Ellisman, Mark H.
McAdams, Harley H.
Shapiro, Lucy
TI Caulobacter PopZ forms a polar subdomain dictating sequential changes in
pole composition and function
SO MOLECULAR MICROBIOLOGY
LA English
DT Article
ID BACTERIAL-CELL-CYCLE; CHROMOSOME SEGREGATION; DNA-REPLICATION; REGULATOR
CONTROLS; PROTEASE COMPLEX; CRESCENTUS; LOCALIZATION; PROTEINS;
DIVISION; GENE
AB P>The bacterium Caulobacter crescentus has morphologically and functionally distinct cell poles that undergo sequential changes during the cell cycle. We show that the PopZ oligomeric network forms polar ribosome exclusion zones that change function during cell cycle progression. The parS/ParB chromosomal centromere is tethered to PopZ at one pole prior to the initiation of DNA replication. During polar maturation, the PopZ-centromere tether is broken, and the PopZ zone at that pole then switches function to act as a recruitment factor for the ordered addition of multiple proteins that promote the transformation of the flagellated pole into a stalked pole. Stalked pole assembly, in turn, triggers the initiation of chromosome replication, which signals the formation of a new PopZ zone at the opposite cell pole, where it functions to anchor the newly duplicated centromere that has traversed the long axis of the cell. We propose that pole-specific control of PopZ function co-ordinates polar development and cell cycle progression by enabling independent assembly and tethering activities at the two cell poles.
C1 [Bowman, Grant R.; Fero, Michael; McAdams, Harley H.; Shapiro, Lucy] Stanford Univ, Sch Med, Dept Dev Biol, Stanford, CA 94305 USA.
[Comolli, Luis R.; Downing, Kenneth H.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA.
[Gaietta, Guido M.; Jones, Ying; Lee, Julie H.; Ellisman, Mark H.] Univ Calif San Diego, Ctr Res Biol Syst, Natl Ctr Microscopy & Imaging Res, San Diego, CA 92093 USA.
[Ellisman, Mark H.] Univ Calif San Diego, Dept Neurosci, Dept Code 0608, San Diego, CA 92093 USA.
[Hong, Sun-Hae] Stanford Univ, Sch Humanities & Sci, Dept Phys, Stanford, CA 94305 USA.
RP Shapiro, L (reprint author), Stanford Univ, Sch Med, Dept Dev Biol, Stanford, CA 94305 USA.
EM shapiro@stanford.edu
FU National Institute of Health [GM073001, GM51426, GM32506,
5P41RR004050-16, F32GM080008]; Department of Energy [DE-FG02-05ER64136]
FX We thank Patrick Viollier for kindly providing strains, and also Esteban
Toro, Antonio Iniesta and other members of the Shapiro lab for advice
and critical reading of the manuscript. This work was supported by
National Institute of Health Grants GM073001 to H.H.M and L.S., GM51426
and GM32506 to L.S., 5P41RR004050-16 to M.H.E. and F32GM080008 to G.B.;
and by Department of Energy Grants DE-FG02-05ER64136 to L.S. and H.H.M,
and DE-FG02-05ER64136 to M.H.E.
NR 44
TC 45
Z9 46
U1 2
U2 9
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0950-382X
J9 MOL MICROBIOL
JI Mol. Microbiol.
PD APR
PY 2010
VL 76
IS 1
BP 173
EP 189
DI 10.1111/j.1365-2958.2010.07088.x
PG 17
WC Biochemistry & Molecular Biology; Microbiology
SC Biochemistry & Molecular Biology; Microbiology
GA 575AS
UT WOS:000276036000013
PM 20149103
ER
PT J
AU Picraux, ST
AF Picraux, S. Tom
TI Exploring New Science Through Nanoscale Integration
SO MRS BULLETIN
LA English
DT Editorial Material
C1 [Picraux, S. Tom] Natl Nanoscale Sci Res Ctr, Ctr Integrated Nanotechnol, Dept Energy DOE, Los Alamos, NM USA.
[Picraux, S. Tom] Sandia Natl Labs, Livermore, CA 94550 USA.
RP Picraux, ST (reprint author), Natl Nanoscale Sci Res Ctr, Ctr Integrated Nanotechnol, Dept Energy DOE, Los Alamos, NM USA.
NR 0
TC 1
Z9 1
U1 0
U2 2
PU MATERIALS RESEARCH SOC
PI WARRENDALE
PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA
SN 0883-7694
J9 MRS BULL
JI MRS Bull.
PD APR
PY 2010
VL 35
IS 4
BP 262
EP 263
DI 10.1557/mrs2010.542
PG 2
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 585OH
UT WOS:000276835100002
ER
PT J
AU Guisinger, NP
Arnold, MS
AF Guisinger, Nathan P.
Arnold, Michael S.
TI Beyond Silicon: Carbon-Based Nanotechnology
SO MRS BULLETIN
LA English
DT Article
ID GRAPHENE; PROSPECTS; DIAMOND
AB For more than two decades, scientists and engineers have focused on impending limitations (from high-power densities and heat distribution to device patterning) that constrain the future miniaturization of conventional silicon technology. Thus far, academic and industrial efforts have risen to the challenge and continue to advance planar silicon processing, pushing traditional microtechnology to the nanometer scale. However, insurmountable limitations, both of physical nature and cost, still loom and motivate the research of new nanomaterials and technologies that have the potential to replace and/or enhance conventional silicon systems. As time has progressed, another Group IV element has emerged as a front-runner, looking beyond silicon, in the form of carbon-based nanotechnology. The focus of this issue is to provide a comprehensive look at the state-of-the-art in carbon-based nanomaterials and nanotechnologies and their potential impact on conventional silicon technologies, which are not limited to electronics but also encompass micro- and nanoelectromechanical systems, optoelectronics, and memory. Recent advances in carbon nanotube growth, sorting, and optoelectronics will be discussed, and the relatively new and surging area of graphene research will be introduced. In addition, progress in controlling the growth and properties of ultrananocrystalline and nanocrystalline diamond thin films will be reviewed. These efforts are multidisciplinary, heavily materials focused, and tend to translate information and ideas to other carbon-based studies (e.g., graphene is the building block of carbon nanotubes).
C1 [Guisinger, Nathan P.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
[Arnold, Michael S.] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA.
[Arnold, Michael S.] Univ Michigan, Ann Arbor, MI 48109 USA.
[Arnold, Michael S.] UW Madison, Adv Mat Energy & Elect Grp, Madison, WI USA.
RP Guisinger, NP (reprint author), Argonne Natl Lab, Ctr Nanoscale Mat, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM nguisinger@anl.gov; msarnold@wisc.edu
RI Arnold, Michael/L-9112-2015;
OI Martel, Richard/0000-0002-9021-4656
NR 13
TC 18
Z9 18
U1 0
U2 12
PU MATERIALS RESEARCH SOC
PI WARRENDALE
PA 506 KEYSTONE DR, WARRENDALE, PA 15086 USA
SN 0883-7694
J9 MRS BULL
JI MRS Bull.
PD APR
PY 2010
VL 35
IS 4
BP 273
EP 276
PG 4
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 585OH
UT WOS:000276835100014
ER
PT J
AU Costes, SV
Chiolo, I
Pluth, JM
Barcellos-Hoff, MH
Jakob, B
AF Costes, S. V.
Chiolo, I.
Pluth, J. M.
Barcellos-Hoff, M. H.
Jakob, B.
TI Spatiotemporal characterization of ionizing radiation induced DNA damage
foci and their relation to chromatin organization
SO MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH
LA English
DT Article; Proceedings Paper
CT ESF-EMBO Symposium on Spatio-Temporal Radiation Biology
CY MAY 16-21, 2009
CL St Feliu de Guixols, SPAIN
SP European Sci Fdn, European Mol Biol Org, Catalunya Reg, CNRS, CEA, European Synchrotron Radiat Facil, Fdn Fourmentin Guilberg, Inst Natl Canc, INSERM, Soc Int Radiobiol Langue Francaise, Synchrotron Soleil, Radiat Biol Melusyn Network
DE DSB; gamma H2AX; ATMp; 53BP1; Repair kinetics; Review; Chromatin;
Complex damage
ID DOUBLE-STRAND BREAKS; PHOSPHORYLATED HISTONE H2AX; LOW-LET RADIATION;
GAMMA-H2AX FOCI; MAMMALIAN-CELLS; DEACETYLASE INHIBITOR; HUMAN
FIBROBLASTS; NUCLEAR FOCI; HETEROCHROMATIN PROTEIN-1; POSITIONAL
STABILITY
AB DNA damage sensing proteins have been shown to localize to the sites of DNA double strand breaks (DSB) within seconds to minutes following ionizing radiation (IR) exposure, resulting in the formation of microscopically visible nuclear domains referred to as radiation-induced foci (RIF). This review characterizes the spatiotemporal properties of RIF at physiological doses, minutes to hours following exposure to ionizing radiation, and it proposes a model describing RIF formation and resolution as a function of radiation quality and chromatin territories. Discussion is limited to RIF formed by three interrelated proteins ATM (Ataxia telangiectasia mutated), 53BP1 (p53 binding protein 1) and gamma H2AX (phosphorylated variant histone H2AX), with an emphasis on the later. This review discusses the importance of not equating RIF with DSB in all situations and shows how dose and time dependence of RIF frequency is inconsistent with a one to one equivalence. Instead, we propose that RIF mark regions of the chromatin that would serve as scaffolds rigid enough to keep broken DNA from diffusing away, but open enough to allow the repair machinery to access the damage site. We review data indicating clear kinetic and physical differences between RIF emerging from dense and uncondensed regions of the nucleus. We suggest that persistent RIF observed days following exposure to ionizing radiation are nuclear marks of permanent rearrangement of the chromatin architecture. Such chromatin alterations may not always lead to growth arrest as cells have been shown to replicate these in progeny. Thus, heritable persistent RIF spanning over tens of Mbp may reflect persistent changes in the transcriptome of a large progeny of cells. Such model opens the door to a "non-DNA-centric view" of radiation-induced phenotypes. Published by Elsevier B.V.
C1 [Costes, S. V.; Chiolo, I.; Pluth, J. M.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA.
[Barcellos-Hoff, M. H.] NYU, Sch Med, New York, NY USA.
[Jakob, B.] GSI Helmholtzzentrum Schwerionenforsch GmbH, Darmstadt, Germany.
RP Costes, SV (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, 1 Cyclotron Rd,MS 977R225A, Berkeley, CA 94720 USA.
EM svcostes@lbl.gov
RI Jakob, Burkhard/D-2047-2013; Costes, Sylvain/D-2522-2013
OI Jakob, Burkhard/0000-0003-2404-377X; Costes, Sylvain/0000-0002-8542-2389
FU NIEHS NIH HHS [R21 ES021541]; NIGMS NIH HHS [R01 GM086613]
NR 75
TC 98
Z9 101
U1 0
U2 8
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1383-5742
J9 MUTAT RES-REV MUTAT
JI Mutat. Res.-Rev. Mutat. Res.
PD APR-JUN
PY 2010
VL 704
IS 1-3
SI SI
BP 78
EP 87
DI 10.1016/j.mrrev.2009.12.006
PG 10
WC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology
SC Biotechnology & Applied Microbiology; Genetics & Heredity; Toxicology
GA 609CS
UT WOS:000278633300011
PM 20060491
ER
PT J
AU Jiang, N
Zhang, YY
Liu, Q
Cheng, ZH
Deng, ZT
Du, SX
Gao, HJ
Beck, MJ
Pantelides, ST
AF Jiang, N.
Zhang, Y. Y.
Liu, Q.
Cheng, Z. H.
Deng, Z. T.
Du, S. X.
Gao, H. -J.
Beck, M. J.
Pantelides, S. T.
TI Diffusivity Control in Molecule-on-Metal Systems Using Electric Fields
SO NANO LETTERS
LA English
DT Article
DE Molecular electronics; surface diffusivity; surface patterning;
selective adsorption
ID SCANNING-TUNNELING-MICROSCOPY; AU(111) SURFACE; IRON PHTHALOCYANINE;
GROWTH; ATOMS
AB The development of methods for controlling the motion and arrangement of molecules adsorbed on a metal surface would provide a powerful tool for the design of molecular electronic devices. Recently, metal phthalocyanines (MPc) have been extensively considered for use in such devices, Here we show that applied electric fields can be used to turn off the diffusivity of iron phthalocyanine (FePc) on Au(111) at fixed temperature, demonstrating a practical and direct method for controlling and potentially patterning FePc layers. Using scanning tunneling microscopy, we show that the diffusivity of FePc on Au(it) is a strong function of temperature and that applied electric fields can be used to retard or enhance molecular diffusion at fixed temperature. Using spin-dependent density-functional calculations, we then explore the origin of this effect, showing that applied fields modify both the molecule surface binding energies and the molecular diffusion barriers through an interaction with the dipolar Fe Au adsorption bond. On the basis of these results FePc on Au(111) is a promising candidate system or the development of adaptive molecular device structures.
C1 [Jiang, N.; Zhang, Y. Y.; Liu, Q.; Cheng, Z. H.; Deng, Z. T.; Du, S. X.; Gao, H. -J.; Beck, M. J.] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
[Zhang, Y. Y.; Pantelides, S. T.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA.
[Pantelides, S. T.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Beck, M. J.] Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA.
RP Gao, HJ (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, POB 603, Beijing 100190, Peoples R China.
EM hjgao@aphy.iphyaccn; pantelides@vanderbilt.edu
RI Du, Shixuan/K-7145-2012; cheng, zhihai/F-4005-2011; Zhang,
Yu-Yang/F-2078-2011; IoP, Nano Lab/B-9663-2013; cheng,
zhihai/B-9526-2014; Jiang, Nan/E-2716-2014
OI Du, Shixuan/0000-0001-9323-1307; Zhang, Yu-Yang/0000-0002-9548-0021;
cheng, zhihai/0000-0003-4938-4490; Jiang, Nan/0000-0001-9787-8407
FU Natural Science Foundation or China (NSFC); National 973 and 863
projects or China; CAS; Shanghai Super-computer Center; U.S. Department
of Energy [DEFG0203ER46096]; McMinn Endowment at Vanderbilt University
FX This work was supported in part by the Natural Science Foundation or
China (NSFC), National 973 and 863 projects or China, CAS, the Shanghai
Super-computer Center, the U.S. Department of Energy Grant
DEFG0203ER46096, and the McMinn Endowment at Vanderbilt University.
NR 32
TC 36
Z9 36
U1 1
U2 37
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
J9 NANO LETT
JI Nano Lett.
PD APR
PY 2010
VL 10
IS 4
BP 1184
EP 1188
DI 10.1021/nl903473p
PG 5
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 581WU
UT WOS:000276557100016
PM 20178372
ER
PT J
AU Splendiani, A
Sun, L
Zhang, YB
Li, TS
Kim, J
Chim, CY
Galli, G
Wang, F
AF Splendiani, Andrea
Sun, Liang
Zhang, Yuanbo
Li, Tianshu
Kim, Jonghwan
Chim, Chi-Yung
Galli, Giulia
Wang, Feng
TI Emerging Photoluminescence in Monolayer MoS2
SO NANO LETTERS
LA English
DT Article
DE Photoluminescence; two-dimensional materials; metal dichalcogenide
ID ELECTRONIC-STRUCTURE; NANOCRYSTALS; CRYSTALS; GRAPHENE; SILICON; RAMAN;
WSE2
AB Novel physical phenomena can emerge in low-dimensional nanomaterials. Bulk MoS2, a prototypical metal dichalcogenide, is an indirect bandgap semiconductor with negligible photoluminescence. When the MoS2 crystal is thinned to monolayer, however, a strong photoluminescence emerges, indicating an indirect to direct bandgap transition in this d-electron system. This observation shows that quantum confinement in layered d-electron materials like MoS2 provides new opportunities for engineering the electronic structure of matter at the nanoscale.
C1 [Splendiani, Andrea; Sun, Liang; Zhang, Yuanbo; Kim, Jonghwan; Chim, Chi-Yung; Wang, Feng] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Splendiani, Andrea] Scuola Galileiana Studi Super Padova, I-35122 Padua, Italy.
[Li, Tianshu; Galli, Giulia] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA.
[Wang, Feng] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Wang, F (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM fengwang76@berkeley.edu
RI Li, Tianshu/H-6336-2011; wang, Feng/I-5727-2015
OI Li, Tianshu/0000-0002-0529-543X;
FU National Science Foundation; Sloan fellowship; DOE-BES
[DE-FG02-06ER46262]; Miller fellowship; Scuola Galileiana di Studi
Superiori di Padova; EAR
FX We thank Professor Ron Shen for helpful discussion and Professor Xiang
Zhang for the AFM measurements. The work was supported by a National
Science Foundation CAREER award and a Sloan fellowship (F.W.) and by
DOE-BES Grant DE-FG02-06ER46262 (G.G. and T.L.). Y.Z. is supported by a
Miller fellowship and A.S. acknowledges support from Scuola Galileiana
di Studi Superiori di Padova and the EAR.
NR 21
TC 2380
Z9 2405
U1 279
U2 1865
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
J9 NANO LETT
JI Nano Lett.
PD APR
PY 2010
VL 10
IS 4
BP 1271
EP 1275
DI 10.1021/nl903868w
PG 5
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 581WU
UT WOS:000276557100031
PM 20229981
ER
PT J
AU Checco, A
Hofmann, T
DiMasi, E
Black, CT
Ocko, BM
AF Checco, Antonio
Hofmann, Tommy
DiMasi, Elaine
Black, Charles T.
Ocko, Benjamin M.
TI Morphology of Air Nanobubbles Trapped at Hydrophobic Nanopatterned
Surfaces
SO NANO LETTERS
LA English
DT Article
DE Hydrophobicity; nanopatterned surface; nanobubble; X-ray scattering
ID WATER; INTEGRATION
AB The details of air nanobubble trapping at the interface between water and a nanostructured hydrophobic silicon surface are investigated using X-ray scattering and contact angle measurements. Large-area silicon surfaces containing hexagonally packed, 20 nm wide hydrophobic cavities provide ideal model surfaces for studying the morphology of air nanobubbles trapped inside cavities and its dependence on the cavity depth. Transmission small-angle X-ray scattering measurements show stable trapping of air inside the cavities with a partial water penetration of 5-10 nm into the pores, independent of their large depth variation. This behavior is explained by consideration of capillary effects and the cavity geometry. For parabolic cavities, the liquid can reach a thermodynamically stable configuration-a nearly planar nanobubble meniscus-by partially penetrating into the pores. This microscopic information correlates very well with the macroscopic surface wetting behavior.
C1 [Checco, Antonio; Hofmann, Tommy; Ocko, Benjamin M.] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
[DiMasi, Elaine] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA.
[Black, Charles T.] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
RP Checco, A (reprint author), Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
EM checco@bnl.gov
RI 骆, 庆群/C-3671-2012
FU U.S. Department of Energy, the Office of Basic Energy Sciences, and the
Division of Materials Sciences and Engineering [DE-AC02-98CH10886]; IBM
T. J. Watson Research Center (Yorktown Heights, New York)
FX Work at Brookhaven National Laboratory is supported by the U.S.
Department of Energy, the Office of Basic Energy Sciences, and the
Division of Materials Sciences and Engineering under award
DE-AC02-98CH10886. The authors appreciate support from the IBM T. J.
Watson Research Center (Yorktown Heights, New York), and specifically
the expertise of Y. Zhang in preparing the nanostructured silicon
surfaces. The authors also acknowledge the contributions of J. Muniz and
O. Gang during the early stages of the project.
NR 24
TC 42
Z9 42
U1 3
U2 37
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
J9 NANO LETT
JI Nano Lett.
PD APR
PY 2010
VL 10
IS 4
BP 1354
EP 1358
DI 10.1021/nl9042246
PG 5
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 581WU
UT WOS:000276557100046
PM 20180525
ER
PT J
AU Williams, SS
Retterer, S
Lopez, R
Ruiz, R
Samulski, ET
DeSimone, JM
AF Williams, Stuart S.
Retterer, Scott
Lopez, Rene
Ruiz, Ricardo
Samulski, Edward T.
DeSimone, Joseph M.
TI High-Resolution PFPE-based Molding Techniques for Nanofabrication of
High-Pattern Density, Sub-20 nm Features: A Fundamental Materials
Approach
SO NANO LETTERS
LA English
DT Article
DE Soft lithography; molding; replica molding; nanofabrication; PRINT;
perfluoropolyether
ID SOFT LITHOGRAPHY; IMPRINT LITHOGRAPHY; COMPOSITE STAMPS; ASPECT-RATIO;
MONODISPERSE; FABRICATION; PARTICLES; CHEMISTRY; FIDELITY; REPLICA
AB Several perfluoropolyether (PFPE)-based elastomers for high-resolution replica molding applications are explored. The modulus of the elastomeric materials was increased through synthetic and additive approaches while maintaining relatively low surface tension values (<25 mN/m). Using large area (>4 in.(2)) master templates, we experimentally show the relationship between mold resolution and material properties such as modulus and surface tension for materials used in this study. A composite mold approach was used to form flexible molds out of stiff, high modulus materials that allow for replication of sub-20 nm post structures. Sub-100 nm line grating master templates, formed using e-beam lithography, were used to determine the experimental stability of the molding materials. It was observed that as the feature spacing decreased. high modulus PFPE tetramethacrylate (TMA) composite molds were able to effectively replicate the nanograting structures without cracking or tear-out defects that typically occur with high modulus elastomers.
C1 [Williams, Stuart S.; Samulski, Edward T.; DeSimone, Joseph M.] Univ N Carolina, Dept Chem, Chapel Hill, NC 27599 USA.
[Lopez, Rene] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA.
[DeSimone, Joseph M.] N Carolina State Univ, Dept Chem & Biomol Engn, Raleigh, NC 27695 USA.
[Retterer, Scott] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
[Ruiz, Ricardo] San Jose Res Ctr, San Jose, CA 95135 USA.
RP DeSimone, JM (reprint author), Univ N Carolina, Dept Chem, CB 3290, Chapel Hill, NC 27599 USA.
EM desimone@unc.edu
RI Retterer, Scott/A-5256-2011; Lopez, Rene/G-3734-2014;
OI Retterer, Scott/0000-0001-8534-1979; Lopez, Rene/0000-0001-6274-066X;
Ruiz, Ricardo/0000-0002-1698-4281
FU National Science Foundation [CMS-0507151]; UNC EFRC; U.S. Department of
Energy, Office of Science, Office of Basic Energy Sciences
[DE-SC0001011]; Office of Naval Research; Liquidia Technologies;
Division of Scientific User Facilities, U.S. Department of Energy
FX This work was partially supported by the STC program of the National
Science Foundation under Agreement No. CMS-0507151, the UNC EFRC: Solar
Fuels and Next Generation Photovoltaics, an Energy Frontier Research
Center funded by the U.S. Department of Energy, Office of Science,
Office of Basic Energy Sciences under Award Number DE-SC0001011, the
Office of Naval Research, Liquidia Technologies, and the William R.
Kenan, Jr., Distinguished Professorship. We thank Hitachi for providing
the silicon master template shown in Figure 2. A portion of this
research was conducted at the Center for Nanophase Materials Sciences,
which is sponsored at Oak Ridge National Laboratory by the Division of
Scientific User Facilities, U.S. Department of Energy.
NR 35
TC 55
Z9 55
U1 5
U2 48
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
J9 NANO LETT
JI Nano Lett.
PD APR
PY 2010
VL 10
IS 4
BP 1421
EP 1428
DI 10.1021/nl100326q
PG 8
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 581WU
UT WOS:000276557100058
PM 20178369
ER
PT J
AU Gao, HF
Poulsen, DA
Ma, BW
Unruh, DA
Zhao, XY
Millstone, JE
Frechet, JMJ
AF Gao, Haifeng
Poulsen, Daniel A.
Ma, Biwu
Unruh, David A.
Zhao, Xiaoyong
Millstone, Jill E.
Frechet, Jean M. J.
TI Site Isolation of Emitters within Cross-Linked Polymer Nanoparticles for
White Electroluminescence
SO NANO LETTERS
LA English
DT Article
DE Site-isolation; energy transfer; encapsulated chromophore; nanoparticle;
OLED
ID LIGHT-EMITTING DEVICES; IRIDIUM COMPLEXES; SINGLE; DIODES; CHROMOPHORES;
EMISSION
AB The use of cross-linked polymer nanoparticles was explored to achieve site isolation of different emitters within a single emissive layer in an electroluminescent device. Encapsulation of the iridium emitters within the polymer nanoparticles led to the desired effect with minimal energy transfer from high bandgap chromophores to lower bandgap ones. The nanoparticles were easily dispersed in organic solvent for film casting while preserving particle shape. They behave as light emitting "inks", enabling the tuning of electroluminescence through simple changes in the ratios of nanoparticles in the emissive film.
C1 [Gao, Haifeng; Poulsen, Daniel A.; Unruh, David A.; Zhao, Xiaoyong; Millstone, Jill E.; Frechet, Jean M. J.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Gao, Haifeng; Poulsen, Daniel A.; Ma, Biwu; Frechet, Jean M. J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Frechet, JMJ (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
EM frechet@berkeley.edu
RI Gao, Haifeng/C-3286-2008; Ma, Biwu/B-6943-2012; Gao,
Haifeng/D-1610-2016;
OI Millstone, Jill/0000-0002-9499-5744; Frechet, Jean /0000-0001-6419-0163
FU U.S. Department of Energy [DE-AC02-05CH11231]
FX This work was supported by the U.S. Department of Energy under Contract
No. DE-AC02-05CH11231. Analytical portions of this work were performed
at the Molecular Foundry, Lawrence Berkeley National Laboratory.
NR 18
TC 26
Z9 26
U1 1
U2 45
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
J9 NANO LETT
JI Nano Lett.
PD APR
PY 2010
VL 10
IS 4
BP 1440
EP 1444
DI 10.1021/nl100347p
PG 5
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 581WU
UT WOS:000276557100061
PM 20297766
ER
PT J
AU Akey, A
Lu, CG
Yang, L
Herman, IP
AF Akey, Austin
Lu, Chenguang
Yang, Lin
Herman, Irving P.
TI Formation of Thick, Large-Area Nanoparticle Superlattices in
Lithographically Defined Geometries
SO NANO LETTERS
LA English
DT Article
DE Nanoparticles; superlattice; self assembly; microfluidics; ordered array
ID NANOCRYSTAL SUPERLATTICES; MONODISPERSE NANOCRYSTALS; BINARY
SUPERLATTICES; SELF-ORGANIZATION; CDSE; CRYSTALLIZATION; CRYSTALS;
LATTICE; PBSE
AB Superlattices of colloidal nanocrystals hold the promise of new nanomaterials with tunable properties. The positioning and size of these structures are often poorly controlled after self-assembly from the solution phase, making studies of their properties difficult. We report the fabrication of similar to 100 layer thick, three-dimensional superlattices on a substrate with controlled lateral placement. This novel fabrication technique generates long-range order over the micrometer scale and controlled placement by employing lithographic patterning and microfluidic flow.
C1 [Akey, Austin; Lu, Chenguang; Herman, Irving P.] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
[Yang, Lin] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA.
RP Herman, IP (reprint author), Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
RI Lu, Chenguang/G-6850-2011; Yang, Lin/D-5872-2013
OI Yang, Lin/0000-0003-1057-9194
FU National Science Foundation [DMR-0213574]; NSF [CHE-0641523]; New York
State Office of Science, Technology, and Academic Research (NYSTAR);
U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-98CH10886]
FX The authors thank Stephen O'Brien for use of his synthesis facilities.
This work was supported primarily by the MRSEC program of the National
Science Foundation (DMR-0213574), the NSEC program of the NSF
(CHE-0641523), and by the New York State Office of Science, Technology,
and Academic Research (NYSTAR). Use of the National Synchrotron Light
Source, Brookhaven National Laboratory, was supported by the U.S.
Department of Energy, Office of Science, Office of Basic Energy
Sciences, under Contract No. DE-AC02-98CH10886.
NR 27
TC 20
Z9 20
U1 0
U2 22
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
J9 NANO LETT
JI Nano Lett.
PD APR
PY 2010
VL 10
IS 4
BP 1517
EP 1521
DI 10.1021/nl100129t
PG 5
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 581WU
UT WOS:000276557100075
PM 20356099
ER
PT J
AU Thundat, T
AF Thundat, Thomas
TI DNA SEQUENCING Read with quantum mechanics
SO NATURE NANOTECHNOLOGY
LA English
DT News Item
C1 Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Thundat, T (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
EM thundattg@ornl.gov
NR 9
TC 7
Z9 7
U1 0
U2 7
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 1748-3387
J9 NAT NANOTECHNOL
JI Nat. Nanotechnol.
PD APR
PY 2010
VL 5
IS 4
BP 246
EP 247
DI 10.1038/nnano.2010.72
PG 2
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 580PE
UT WOS:000276460600006
PM 20376071
ER
PT J
AU Brown, RS
Harnish, RA
Carter, KM
Boyd, JW
Deters, KA
Eppard, MB
AF Brown, Richard S.
Harnish, Ryan A.
Carter, Kathleen M.
Boyd, James W.
Deters, Katherine A.
Eppard, M. Brad
TI An Evaluation of the Maximum Tag Burden for Implantation of Acoustic
Transmitters in Juvenile Chinook Salmon
SO NORTH AMERICAN JOURNAL OF FISHERIES MANAGEMENT
LA English
DT Article
ID ATLANTIC SALMON; SWIMMING PERFORMANCE; RADIO TRANSMITTERS; PREDATOR
AVOIDANCE; COLUMBIA RIVERS; SURVIVAL; TROUT; SMOLTS; GROWTH; WILD
AB A substantial percentage of the Pacific salmon Oncorhynchus spp. and steelhead O. mykiss smolts that emigrate to the ocean each year are smaller than 110 mm (fork length). However, relatively few researchers have implanted acoustic transmitters in fish of this size, and none have reported minimum fish lengths below 110 mm for which the tag burden did not negatively influence growth or survival. The influence of a surgically implanted acoustic microtransmitter and a passive integrated transponder (PIT) tag on the growth and survival of hatchery-reared juvenile Chinook salmon was examined over a period of 30 d. Growth and survival were compared between treatment (tagged) and control (untagged) fish within three size-groups (80-89, 90-99, and 100-109 mm). The acoustic microtransmitter and PIT tag implanted in our study had a combined weight of 0.74 g; the combined tag burden for implanted fish ranged from 4.5% to 15.7%. The results indicated that growth and survival among implanted juvenile Chinook salmon were size dependent. Significant differences in growth rate and survival were observed between treatment and control fish in the 80-89-mm group. The survival of implanted fish smaller than 11.1 g (tag burden, >6.7%) and the growth of fish smaller than 9.0 g (tag burden, >8.2%) were negatively affected by the implantation or presence of an acoustic microtransmitter and PIT tag. The results of this study will aid researchers in determining the minimum fish size suitable for use in acoustic telemetry studies that estimate the short-term (30-d) survival and growth of juvenile salmonids.
C1 [Brown, Richard S.; Harnish, Ryan A.; Carter, Kathleen M.; Boyd, James W.; Deters, Katherine A.] Pacific NW Natl Lab, Ecol Grp, Richland, WA 99352 USA.
[Eppard, M. Brad] US Army Corps Engineers, Portland, OR 97204 USA.
RP Brown, RS (reprint author), Pacific NW Natl Lab, Ecol Grp, POB 999, Richland, WA 99352 USA.
EM rich.brown@pnl.gov
FU U.S. Army Corps of Engineers, Portland District; U.S. Department of
Energy [DE-AC05-76RL01830]
FX This study was funded by the U.S. Army Corps of Engineers, Portland
District. The Pacific Northwest National Laboratory is operated by
Battelle for the U.S. Department of Energy under contract
DE-AC05-76RL01830. With appreciation, we acknowledge the technical
contributions to the project made by the following people from the
Pacific Northwest National Laboratory: Brian Bellgraph, Geoffrey
McMichael, Jessica Carter, David Geist, Tom Carlson, Abby Welch, Marie
Theriault, Garrett McKinney, Jennifer Panther, Katie Ovink, Katie
Murray, Gayle Dirkes, Tirell Monter, Ian Welch, Julie Miller, Brooke
Sakara, Chris Eilers, Scott Abernethy, Craig McKinstry, and Andrea
Currie. We also thank John Skalski of the University of Washington. Our
thanks go also to Brad Ryan, Eric Hockersmith, and Michelle Rub of NOAA
Fisheries.
NR 28
TC 34
Z9 34
U1 0
U2 12
PU AMER FISHERIES SOC
PI BETHESDA
PA 5410 GROSVENOR LANE SUITE 110, BETHESDA, MD 20814-2199 USA
SN 0275-5947
J9 N AM J FISH MANAGE
JI North Am. J. Fish Manage.
PD APR
PY 2010
VL 30
IS 2
BP 499
EP 505
DI 10.1577/M09-038.1
PG 7
WC Fisheries
SC Fisheries
GA 599XP
UT WOS:000277947800014
ER
PT J
AU Nesaraja, CD
Geraedts, SD
Singh, B
AF Nesaraja, Caroline D.
Geraedts, Scott D.
Singh, Balraj
TI Nuclear Data Sheets for A=58
SO NUCLEAR DATA SHEETS
LA English
DT Article
ID NEUTRON-RICH ISOTOPES; SHELL-MODEL CALCULATIONS; HIGH-SPIN STATES;
INELASTIC ELECTRON-SCATTERING; DOUBLE-CHARGE-EXCHANGE; LOW-LYING STATES;
ALPHA-PARTICLE SCATTERING; GAMOW-TELLER STRENGTH; GAMMA-RAY ENERGIES;
RELATIVISTIC COULOMB-EXCITATION
AB The evaluated spectroscopic data are presented for known nuclides of mass 58 (Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn). Excited state data are nonexistent for Ca-58, Sc-58, and Zn-58; and very scarce for Ti-58 and V-58, with only one tentative level in each case. Except for half lives, no other radioactive decay data are available for the decay of Sc-58 and Ti-58. The radioactive decays of V-58, Cr-58 and Zn-58 are not considered as well established. Superdeformed structures are known in Ni-58 (two bands) and in Cu-58 (one band). Prompt proton decay of high spin states in Ni-58 for eight levels and prompt alpha decay for two states have been identified. In one high spin state decays by prompt proton emission. Very complex high spin structures are now known for Ni-58 from the work by 2009Jo03.
C1 [Nesaraja, Caroline D.] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA.
[Nesaraja, Caroline D.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
[Geraedts, Scott D.; Singh, Balraj] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada.
RP Nesaraja, CD (reprint author), Oak Ridge Natl Lab, Div Phys, POB 2008, Oak Ridge, TN 37831 USA.
OI Nesaraja, Caroline/0000-0001-5571-8341
FU Office of Nuclear Physics; Office of Science; Department of Energy of
the U.S.A; NSERC of Canada
FX Work supported by the Office of Nuclear Physics, Office of Science,
Department of Energy of the U.S.A. The work at McMaster was also
supported partly by the NSERC of Canada
NR 538
TC 26
Z9 26
U1 2
U2 8
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0090-3752
J9 NUCL DATA SHEETS
JI Nucl. Data Sheets
PD APR
PY 2010
VL 111
IS 4
BP 897
EP 1091
DI 10.1016/j.nds.2010.03.003
PG 195
WC Physics, Nuclear
SC Physics
GA 580WG
UT WOS:000276480600001
ER
PT J
AU Browne, E
Tuli, JK
AF Browne, E.
Tuli, J. K.
TI Nuclear Data Sheets for A=66
SO NUCLEAR DATA SHEETS
LA English
DT Article
ID GAMMA-RAY SPECTROSCOPY; LYING COLLECTIVE STATES; NEUTRON-RICH ISOTOPES;
MEDIUM-WEIGHT NUCLEI; EVEN-EVEN NUCLEI; HIGH-SPIN STATES; FP-SHELL
NUCLEI; PROTON INELASTIC-SCATTERING; ELASTIC ELECTRON-SCATTERING; TARGET
EXCITATION-FUNCTIONS
AB The evaluators present in this publication spectroscopic data and level schemes from radioactive decay and nuclear reactions studies for all isobars with mass number A=66. The first level scheme of (66)As, from (HI,xn gamma), has been included in this evaluation.
C1 [Browne, E.] Lawrence Berkeley Lab, Upton, NY 11973 USA.
RP Browne, E (reprint author), Lawrence Berkeley Lab, Upton, NY 11973 USA.
NR 358
TC 21
Z9 21
U1 0
U2 2
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0090-3752
J9 NUCL DATA SHEETS
JI Nucl. Data Sheets
PD APR
PY 2010
VL 111
IS 4
BP 1093
EP +
DI 10.1016/j.nds.2010.03.004
PG 116
WC Physics, Nuclear
SC Physics
GA 580WG
UT WOS:000276480600002
ER
PT J
AU Neerdael, B
Finsterle, S
AF Neerdael, Bernard
Finsterle, Stefan
TI THE USE OF NUMERICAL MODELS IN SUPPORT OF SITE CHARACTERIZATION AND
PERFORMANCE ASSESSMENT STUDIES FOR GEOLOGICAL REPOSITORIES
SO NUCLEAR ENGINEERING AND TECHNOLOGY
LA English
DT Article
DE Modelling; Siting; Characterization; Performance Assessment; Geological
Disposal; Repository
AB The paper is describing work being developed in the frame of a 5-year IAEA Coordinated Research Programme (CRP) started in late 2005. Participants gained knowledge of modelling methodologies and experience in the development and use of rather sophisticated simulation tools in support of site characterization and performance assessment calculations.
These goals were achieved by a coordinated effort, in which the advantages and limitations of numerical models are examined and demonstrated through a comparative analysis of simplified, illustrative test cases. This knowledge and experience should help them address these issues in their own country's nuclear waste program.
Coordination efforts during the first three years of the project aimed at enabling this transfer of expertise and maximizing the learning experience of the participants as a group. This was accomplished by identifying common interests of the participants (i.e., Process Modelling and Total System Performance Assessment methodology), and by defining complementary tasks that are solved by the members. Synthesis of all available results by comparative assessments is planned in the coming months. The project will be completed end of 2010. This paper is summarizing activities up to November 2009.
C1 [Neerdael, Bernard] IAEA, Vienna Int Ctr, A-1400 Vienna, Austria.
[Finsterle, Stefan] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA.
RP Neerdael, B (reprint author), IAEA, Vienna Int Ctr, A-1400 Vienna, Austria.
EM bneerdael@gmail.com
RI Finsterle, Stefan/A-8360-2009
OI Finsterle, Stefan/0000-0002-4446-9906
NR 6
TC 2
Z9 2
U1 0
U2 1
PU KOREAN NUCLEAR SOC
PI DAEJEON
PA NUTOPIA BLDG, 342-1 JANGDAE-DONG, DAEJEON, 305-308, SOUTH KOREA
SN 1738-5733
J9 NUCL ENG TECHNOL
JI Nucl. Eng. Technol.
PD APR
PY 2010
VL 42
IS 2
BP 145
EP 150
PG 6
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 596DC
UT WOS:000277663400002
ER
PT J
AU Ahn, JW
Canik, JM
Soukhanovskii, VA
Maingi, R
Battaglia, DJ
AF Ahn, J. -W.
Canik, J. M.
Soukhanovskii, V. A.
Maingi, R.
Battaglia, D. J.
TI Modification of divertor heat and particle flux profiles with applied 3D
fields in NSTX H-mode plasmas
SO NUCLEAR FUSION
LA English
DT Article
ID SPHERICAL TORUS EXPERIMENT; MAGNETIC PERTURBATIONS; STABILITY
AB Externally imposed non-axisymmetric magnetic perturbations are observed to alter divertor heat and particle flux profiles in the National Spherical Torus Experiment (NSTX). The divertor profiles are found to have a modest level of multiple local peaks, characteristic of strike point splitting or the 'magnetic lobe' structure, even before the application of the 3D fields in some (but not all) NSTX discharges. This is thought to be due to the intrinsic error fields. The applied 3D fields augmented the intrinsic strike point splitting, making the amplitude of local peaks and valleys larger in the divertor profile and striations at the divertor surface brighter. The measured heat flux profile shows that the radial location and spacing of the striations are qualitatively consistent with a vacuum field tracing calculation. 3D field application did not change the peak divertor heat and particle fluxes at the toroidal location of measurement. Spatial characteristics of the observed patterns are also reported in the paper.
C1 [Ahn, J. -W.; Canik, J. M.; Maingi, R.; Battaglia, D. J.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
[Soukhanovskii, V. A.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
RP Ahn, JW (reprint author), Princeton Plasma Phys Lab, MS-15, Princeton, NJ 08543 USA.
EM jahn@pppl.gov
OI Canik, John/0000-0001-6934-6681
FU US Department of Energy [DE-AC05-000R22725, DE-AC52-07NA27344,
DE-AC02-09CH11466, DE-AC05-06OR23100]
FX The authors are grateful to Dr A. Herrmann for a collaboration through
the agreement of using the THEODOR 2D heat flux calculation code.
Helpful discussions with Dr J.-K. Park are also appreciated. This work
was funded by the US Department of Energy, contract numbers
DE-AC05-000R22725, DE-AC52-07NA27344 and DE-AC02-09CH11466. D.J.
Battaglia is supported by the US Department of Energy Fusion Energy
Postdoctoral Research Program, administered by the Oak Ridge Institute
for Science and Education under contract number DE-AC05-06OR23100.
NR 18
TC 20
Z9 20
U1 0
U2 3
PU INT ATOMIC ENERGY AGENCY
PI VIENNA
PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA
SN 0029-5515
J9 NUCL FUSION
JI Nucl. Fusion
PD APR
PY 2010
VL 50
IS 4
AR 045010
DI 10.1088/0029-5515/50/4/045010
PG 7
WC Physics, Fluids & Plasmas
SC Physics
GA 580UI
UT WOS:000276475600014
ER
PT J
AU Hudson, B
Evans, TE
Osborne, TH
Petty, CC
Snyder, PB
Unterberg, EA
AF Hudson, B.
Evans, T. E.
Osborne, T. H.
Petty, C. C.
Snyder, P. B.
Unterberg, E. A.
TI ELM suppression by resonant magnetic perturbation in high-performance,
stationary plasmas
SO NUCLEAR FUSION
LA English
DT Article
ID EDGE LOCALIZED MODES; DIII-D TOKAMAK; DISCHARGES; TRANSPORT; STABILITY;
PEDESTAL; DESIGN
AB The method of resonant magnetic perturbation (RMP) has been shown to suppress edge-localized modes (ELMs) in the high-performance, stationary (or 'hybrid') scenario in the DIII-D tokamak. Calculations of stability to peeling-ballooning (P-B) modes are shown to be consistent with the observed suppression of type-I ELMs, while the ELM suppression, dependence on edge safety factor and density pump-out are similar for hybrids and standard H-mode discharges. However, other small ELMs can appear when the edge safety factor is outside the resonance window or when the H-mode pedestal is perturbed, which are not related to P-B stability. The role of the edge bootstrap current in determining stochastic heat transport during RMP is discussed.
C1 [Hudson, B.; Unterberg, E. A.] Oak Ridge Inst Sci Educ, Oak Ridge, TN 37831 USA.
[Evans, T. E.; Osborne, T. H.; Petty, C. C.; Snyder, P. B.] Gen Atom Co, San Diego, CA 92186 USA.
RP Hudson, B (reprint author), Oak Ridge Inst Sci Educ, Oak Ridge, TN 37831 USA.
RI Unterberg, Ezekial/F-5240-2016
OI Unterberg, Ezekial/0000-0003-1353-8865
FU US Department of Energy [DE-FC02-04ER54698, DE-AC05-06OR23100,
DE-FG02-95ER54309]
FX This work was supported by the US Department of Energy under
DE-FC02-04ER54698, DE-AC05-06OR23100 and DE-FG02-95ER54309.
NR 39
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Z9 8
U1 1
U2 7
PU INT ATOMIC ENERGY AGENCY
PI VIENNA
PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA
SN 0029-5515
J9 NUCL FUSION
JI Nucl. Fusion
PD APR
PY 2010
VL 50
IS 4
AR 045006
DI 10.1088/0029-5515/50/4/045006
PG 11
WC Physics, Fluids & Plasmas
SC Physics
GA 580UI
UT WOS:000276475600010
ER
PT J
AU In, Y
Bogatu, IN
Garofalo, AM
Jackson, GL
Kim, JS
La Haye, RJ
Lanctot, MJ
Marrelli, L
Martin, P
Okabayashi, M
Reimerdes, H
Schaffer, MJ
Strait, EJ
AF In, Y.
Bogatu, I. N.
Garofalo, A. M.
Jackson, G. L.
Kim, J. S.
La Haye, R. J.
Lanctot, M. J.
Marrelli, L.
Martin, P.
Okabayashi, M.
Reimerdes, H.
Schaffer, M. J.
Strait, E. J.
TI On the roles of direct feedback and error field correction in
stabilizing resistive-wall modes
SO NUCLEAR FUSION
LA English
DT Article
ID DIII-D; TOKAMAKS; ROTATION; PLASMAS
AB Active feedback control in the DIII-D tokamak has fully stabilized the current-driven ideal kink resistive-wall mode (RWM). While complete stabilization is known to require both low frequency error field correction (EFC) and high frequency feedback, unambiguous identification has been made about the distinctive role of each in a fully feedback-stabilized discharge. Specifically, the role of direct RWM feedback, which nullifies the RWM perturbation in a time scale faster than the mode growth time, cannot be replaced by low frequency EFC, which minimizes the lack of axisymmetry of external magnetic fields.
C1 [In, Y.; Bogatu, I. N.; Kim, J. S.] FAR TECH Inc, San Diego, CA USA.
[Garofalo, A. M.; Jackson, G. L.; La Haye, R. J.; Schaffer, M. J.; Strait, E. J.] Gen Atom Co, San Diego, CA 92186 USA.
[Lanctot, M. J.; Reimerdes, H.] Columbia Univ, New York, NY 10027 USA.
[Marrelli, L.; Martin, P.] Consorzio RFX, I-35127 Padua, Italy.
[Okabayashi, M.] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
RP In, Y (reprint author), FAR TECH Inc, 3550 Gen Atom Court,Bldg 15,Suite 155, San Diego, CA USA.
RI Marrelli, Lionello/G-4451-2013; Lanctot, Matthew J/O-4979-2016
OI Marrelli, Lionello/0000-0001-5370-080X; Lanctot, Matthew
J/0000-0002-7396-3372
FU US Department of Energy SBIR [DE-FG02-06ER84442, DE-FC02-04ER54698,
DE-AC02-09CH11466, DE-FG02-89ER53297]
FX This work was supported by the US Department of Energy SBIR under
contracts No DE-FG02-06ER84442, DE-FC02-04ER54698, DE-AC02-09CH11466 and
DE-FG02-89ER53297. The authors are grateful to Drs M. Austin and A.
Turnbull as well as to the DIII-D team.
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PU INT ATOMIC ENERGY AGENCY
PI VIENNA
PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA
SN 0029-5515
J9 NUCL FUSION
JI Nucl. Fusion
PD APR
PY 2010
VL 50
IS 4
AR 042001
DI 10.1088/0029-5515/50/4/042001
PG 5
WC Physics, Fluids & Plasmas
SC Physics
GA 580UI
UT WOS:000276475600001
ER
PT J
AU Menard, JE
Bell, RE
Gates, DA
Gerhardt, SP
Park, JK
Sabbagh, SA
Berkery, JW
Egan, A
Kallman, J
Kaye, SM
LeBlanc, B
Liu, YQ
Sontag, A
Swanson, D
Yuh, H
Zhu, W
AF Menard, J. E.
Bell, R. E.
Gates, D. A.
Gerhardt, S. P.
Park, J. -K.
Sabbagh, S. A.
Berkery, J. W.
Egan, A.
Kallman, J.
Kaye, S. M.
LeBlanc, B.
Liu, Y. Q.
Sontag, A.
Swanson, D.
Yuh, H.
Zhu, W.
CA NSTX Res Team
TI Progress in understanding error-field physics in NSTX spherical torus
plasmas
SO NUCLEAR FUSION
LA English
DT Article
ID RESISTIVE WALL MODE; HIGH-BETA PLASMAS; DIII-D; TOKAMAK PLASMAS;
STABILIZATION; CONFINEMENT; THRESHOLDS; ROTATION; REGIME; LIMITS
AB The low-aspect ratio, low magnetic field and wide range of plasma beta of NSTX plasmas provide new insight into the origins and effects of magnetic field errors. An extensive array of magnetic sensors has been used to analyse error fields, to measure error-field amplification and to detect resistive wall modes (RWMs) in real time. The measured normalized error-field threshold for the onset of locked modes shows a linear scaling with plasma density, a weak to inverse dependence on toroidal field and a positive scaling with magnetic shear. These results extrapolate to a favourable error-field threshold for ITER. For these low-beta locked-mode plasmas, perturbed equilibrium calculations find that the plasma response must be included to explain the empirically determined optimal correction of NSTX error fields. In high-beta NSTX plasmas exceeding the n = 1 no-wall stability limit where the RWM is stabilized by plasma rotation, active suppression of n = 1 amplified error fields and the correction of recently discovered intrinsic n = 3 error fields have led to sustained high rotation and record durations free of low-frequency core MHD activity. For sustained rotational stabilization of the n = 1 RWM, both the rotation threshold and the magnitude of the amplification are important. At fixed normalized dissipation, kinetic damping models predict rotation thresholds for RWM stabilization to scale nearly linearly with particle orbit frequency. Studies for NSTX find that orbit frequencies computed in general geometry can deviate significantly from those computed in the high-aspect ratio and circular plasma cross-section limit, and these differences can strongly influence the predicted RWM stability. The measured and predicted RWM stability is found to be very sensitive to the E x B rotation profile near the plasma edge, and the measured critical rotation for the RWM is approximately a factor of two higher than predicted by the MARS-F code using the semi-kinetic damping model.
C1 [Menard, J. E.; Bell, R. E.; Gates, D. A.; Gerhardt, S. P.; Park, J. -K.; Kallman, J.; Kaye, S. M.; LeBlanc, B.] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
[Sabbagh, S. A.; Berkery, J. W.] Columbia Univ, Fu Fdn Sch Engn & Appl Sci, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
[Egan, A.] Univ Penn, Dept Radiat Oncol, Perelman Ctr Adv Med, Philadelphia, PA 19104 USA.
[Liu, Y. Q.] Culham Sci Ctr, Culham Ctr Fus Energy, Abingdon OX14 3DB, Oxon, England.
[Sontag, A.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
[Swanson, D.] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA.
[Yuh, H.] Nova Photon Inc, Princeton, NJ 08540 USA.
[Zhu, W.] Credit Suisse, New York, NY 10010 USA.
RP Menard, JE (reprint author), Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA.
RI Berkery, John/B-7930-2011; Sabbagh, Steven/C-7142-2011;
OI Menard, Jonathan/0000-0003-1292-3286
FU United States Department of Energy [DE-AC02-09CH11466,
DE-AC05-00OR22725, DE-FG02-99ER54524]
FX The authors wish to thank H. Kugel, R. Kaita and other members of the
NSTX team who assisted in the application of in-vessel lithium coatings
which contributed to the achievement of MHD-free long-pulse plasmas.
Special thanks also to D. Mastrovito and C. A. Ludescher-Furth for
implementing the real-time mode identification and active feedback
control algorithms. This work was supported by the United States
Department of Energy under contract numbers DE-AC02-09CH11466 (PPPL) and
DE-AC05-00OR22725 (ORNL) and grant number DE-FG02-99ER54524 (Columbia
University).
NR 55
TC 43
Z9 43
U1 0
U2 1
PU INT ATOMIC ENERGY AGENCY
PI VIENNA
PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA
SN 0029-5515
J9 NUCL FUSION
JI Nucl. Fusion
PD APR
PY 2010
VL 50
IS 4
AR 045008
DI 10.1088/0029-5515/50/4/045008
PG 22
WC Physics, Fluids & Plasmas
SC Physics
GA 580UI
UT WOS:000276475600012
ER
PT J
AU Svidzinski, VA
Li, H
AF Svidzinski, V. A.
Li, H.
TI Stabilization of ideal pressure gradient driven edge modes during pulsed
parallel current drive in reversed field pinch
SO NUCLEAR FUSION
LA English
DT Article
ID POLOIDAL CURRENT DRIVE; LOCALIZED MODES; CONFINEMENT; FLUCTUATION;
DYNAMO
AB Significant improvement of plasma confinement in the Madison Symmetric Torus reversed field pinch (RFP) has been routinely achieved by applying an inductive electric field at the plasma boundary in the direction parallel to the equilibrium magnetic field at the plasma edge. An auxiliary edge current is driven by this electric field with the goal of replacing the dynamo-driven current and modifying the parallel current profile to reduce current-driven instabilities. This current-drive technique is called pulsed parallel current drive (PPCD) in RFP. During PPCD plasma fluctuations are reduced everywhere resulting in tokamak-like confinement parameters, while the edge density profile steepens significantly and plasma beta increases. A steep edge plasma pressure profile, a relatively high plasma beta and a strong unfavourable curvature of equilibrium magnetic field near the edge in RFP could excite pressure-driven fluid turbulence near the edge and worsen plasma confinement, opposite to the experimental observations. In this study stability analysis of edge pressure gradient driven ideal modes in standard-like and in PPCD-like plasma equilibria is performed. An ideal magnetohydrodynamic plasma model in cylindrical RFP equilibrium with a step function plasma pressure profile and a vacuum layer between the plasma boundary and the conducting shell is used. Standard-like and PPCD-like plasma equilibria in the model are defined by the direction of the surface current at the plasma-vacuum interface. The results show that while in standard-like equilibrium the edge pressure gradient driven modes are highly unstable in this model, the transition to PPCD-like equilibrium completely stabilizes these modes. The modes stabilization is primarily due to strengthening of magnetic shear at the location of the pressure gradient during the drive and due to the proximity of this location to the conducting wall. This stabilization mechanism is not specific to RFPs, making PPCD a general method of stabilization of the edge pressure gradient driven instabilities which could be applied in other magnetic confinement systems. Application of PPCD to stabilize the edge localized modes in tokamaks is proposed.
C1 [Svidzinski, V. A.; Li, H.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Svidzinski, VA (reprint author), FAR TECH Inc, San Diego, CA 92121 USA.
FU US Department of Energy; LDRD program at the Los Alamos National
Laboratory
FX This work was supported by the US Department of Energy and by the LDRD
program at the Los Alamos National Laboratory.
NR 21
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U1 0
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PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0029-5515
J9 NUCL FUSION
JI Nucl. Fusion
PD APR
PY 2010
VL 50
IS 4
AR 045009
DI 10.1088/0029-5515/50/4/045009
PG 11
WC Physics, Fluids & Plasmas
SC Physics
GA 580UI
UT WOS:000276475600013
ER
PT J
AU Adragna, P
Alexa, C
Anderson, K
Antonaki, A
Arabidze, A
Batkova, L
Batusov, V
Beck, HP
Kuutmann, EB
Biscarat, C
Blanchot, G
Bogush, A
Bohm, C
Boldea, V
Bosman, M
Bromberg, C
Budagov, J
Burckhart-Chromek, D
Caprini, M
Caloba, L
Calvet, D
Carli, T
Carvalho, J
Cascella, M
Castelo, J
Castillo, MV
Cavalli-Sforza, M
Cavasinni, V
Cerqueira, AS
Clement, C
Cobal, M
Cogswell, F
Constantinescu, S
Costanzo, D
Corso-Radu, A
Cuenca, C
Damazio, DO
Davidek, T
De, K
Del Prete, T
Di Girolamo, B
Dita, S
Djobava, T
Dobson, M
Dotti, A
Downing, R
Efthymiopoulos, I
Eriksson, D
Errede, D
Errede, S
Farbin, A
Fassouliotis, D
Febbraro, R
Fenyuk, A
Ferdi, C
Ferrer, A
Flaminio, V
Francis, D
Fullana, E
Gadomski, S
Gameiro, S
Garde, V
Gellerstedt, K
Giakoumopoulou, V
Gildemeister, O
Gilewsky, V
Giokaris, N
Gollub, N
Gomes, A
Gonzalez, V
Gorini, B
Grenier, P
Gris, P
Gruwe, M
Guarino, V
Guicheney, C
Gupta, A
Haeberli, C
Hakobyan, H
Haney, M
Hellman, S
Henriques, A
Higon, E
Holmgren, S
Hurwitz, M
Huston, J
Iglesias, C
Isaev, A
Jen-La Plante, I
Jon-And, K
Joos, M
Junk, T
Karyukhin, A
Kazarov, A
Khandanyan, H
Khramov, J
Khubua, J
Kolos, S
Korolkov, I
Krivkova, P
Kulchitsky, Y
Kurochkin, Y
Kuzhir, P
Le Compte, T
Lefevre, R
Lehmann, G
Leitner, R
Lembesi, M
Lesser, J
Li, J
Liablin, M
Lokajicek, M
Lomakin, Y
Lupi, A
Maidanchik, C
Maio, A
Makouski, M
Maliukov, S
Manousakis, A
Mapelli, L
Marques, C
Marroquim, F
Martin, F
Mazzoni, E
Merritt, F
Miagkov, A
Miller, R
Minashvili, I
Miralles, L
Montarou, G
Mosidze, M
Myagkov, A
Nemecek, S
Nessi, M
Nodulman, L
Nordkvist, B
Norniella, O
Novakova, J
Onofre, A
Oreglia, M
Pallin, D
Pantea, D
Petersen, J
Pilcher, J
Pina, J
Pinhao, J
Podlyski, F
Portell, X
Poveda, J
Pribyl, L
Price, LE
Proudfoot, J
Ramstedt, M
Richards, R
Roda, C
Romanov, V
Rosnet, P
Roy, P
Ruiz, A
Rumiantsev, V
Russakovich, N
Salto, O
Salvachua, B
Sanchis, E
Sanders, H
Santoni, C
Saraiva, JG
Sarri, F
Satsunkevitch, I
Says, LP
Schlager, G
Schlereth, J
Seixas, JM
Sellden, B
Shalanda, N
Shevtsov, P
Shochet, M
Silva, J
Da Silva, P
Simaitis, V
Simonyan, M
Sissakian, A
Sjolin, J
Solans, C
Solodkov, A
Soloviev, I
Solovyanov, O
Sosebee, M
Spano, F
Stanek, R
Starchenko, E
Starovoitov, P
Stavina, P
Suk, M
Sykora, I
Tang, F
Tas, P
Teuscher, R
Tokar, S
Topilin, N
Torres, J
Tremblet, L
Tsiareshka, P
Tylmad, M
Underwood, D
Unel, G
Usai, G
Valero, A
Valkar, S
Valls, JA
Vartapetian, A
Vazeille, F
Vichou, I
Vinogradov, V
Vivarelli, I
Volpi, M
White, A
Zaitsev, A
Zenine, A
Zenis, T
AF Adragna, P.
Alexa, C.
Anderson, K.
Antonaki, A.
Arabidze, A.
Batkova, L.
Batusov, V.
Beck, H. P.
Kuutmann, E. Bergeaas
Biscarat, C.
Blanchot, G.
Bogush, A.
Bohm, C.
Boldea, V.
Bosman, M.
Bromberg, C.
Budagov, J.
Burckhart-Chromek, D.
Caprini, M.
Caloba, L.
Calvet, D.
Carli, T.
Carvalho, J.
Cascella, M.
Castelo, J.
Castillo, M. V.
Cavalli-Sforza, M.
Cavasinni, V.
Cerqueira, A. S.
Clement, C.
Cobal, M.
Cogswell, F.
Constantinescu, S.
Costanzo, D.
Corso-Radu, A.
Cuenca, C.
Damazio, D. O.
Davidek, T.
De, K.
Del Prete, T.
Di Girolamo, B.
Dita, S.
Djobava, T.
Dobson, M.
Dotti, A.
Downing, R.
Efthymiopoulos, I.
Eriksson, D.
Errede, D.
Errede, S.
Farbin, A.
Fassouliotis, D.
Febbraro, R.
Fenyuk, A.
Ferdi, C.
Ferrer, A.
Flaminio, V.
Francis, D.
Fullana, E.
Gadomski, S.
Gameiro, S.
Garde, V.
Gellerstedt, K.
Giakoumopoulou, V.
Gildemeister, O.
Gilewsky, V.
Giokaris, N.
Gollub, N.
Gomes, A.
Gonzalez, V.
Gorini, B.
Grenier, P.
Gris, P.
Gruwe, M.
Guarino, V.
Guicheney, C.
Gupta, A.
Haeberli, C.
Hakobyan, H.
Haney, M.
Hellman, S.
Henriques, A.
Higon, E.
Holmgren, S.
Hurwitz, M.
Huston, J.
Iglesias, C.
Isaev, A.
Jen-La Plante, I.
Jon-And, K.
Joos, M.
Junk, T.
Karyukhin, A.
Kazarov, A.
Khandanyan, H.
Khramov, J.
Khubua, J.
Kolos, S.
Korolkov, I.
Krivkova, P.
Kulchitsky, Y.
Kurochkin, Yu.
Kuzhir, P.
Le Compte, T.
Lefevre, R.
Lehmann, G.
Leitner, R.
Lembesi, M.
Lesser, J.
Li, J.
Liablin, M.
Lokajicek, M.
Lomakin, Y.
Lupi, A.
Maidanchik, C.
Maio, A.
Makouski, M.
Maliukov, S.
Manousakis, A.
Mapelli, L.
Marques, C.
Marroquim, F.
Martin, F.
Mazzoni, E.
Merritt, F.
Miagkov, A.
Miller, R.
Minashvili, I.
Miralles, L.
Montarou, G.
Mosidze, M.
Myagkov, A.
Nemecek, S.
Nessi, M.
Nodulman, L.
Nordkvist, B.
Norniella, O.
Novakova, J.
Onofre, A.
Oreglia, M.
Pallin, D.
Pantea, D.
Petersen, J.
Pilcher, J.
Pina, J.
Pinhao, J.
Podlyski, F.
Portell, X.
Poveda, J.
Pribyl, L.
Price, L. E.
Proudfoot, J.
Ramstedt, M.
Richards, R.
Roda, C.
Romanov, V.
Rosnet, P.
Roy, P.
Ruiz, A.
Rumiantsev, V.
Russakovich, N.
Salto, O.
Salvachua, B.
Sanchis, E.
Sanders, H.
Santoni, C.
Saraiva, J. G.
Sarri, F.
Satsunkevitch, I.
Says, L. -P.
Schlager, G.
Schlereth, J.
Seixas, J. M.
Sellden, B.
Shalanda, N.
Shevtsov, P.
Shochet, M.
Silva, J.
Da Silva, P.
Simaitis, V.
Simonyan, M.
Sissakian, A.
Sjolin, J.
Solans, C.
Solodkov, A.
Soloviev, I.
Solovyanov, O.
Sosebee, M.
Spano, F.
Stanek, R.
Starchenko, E.
Starovoitov, P.
Stavina, P.
Suk, M.
Sykora, I.
Tang, F.
Tas, P.
Teuscher, R.
Tokar, S.
Topilin, N.
Torres, J.
Tremblet, L.
Tsiareshka, P.
Tylmad, M.
Underwood, D.
Unel, G.
Usai, G.
Valero, A.
Valkar, S.
Valls, J. A.
Vartapetian, A.
Vazeille, F.
Vichou, I.
Vinogradov, V.
Vivarelli, I.
Volpi, M.
White, A.
Zaitsev, A.
Zenine, A.
Zenis, T.
TI Measurement of pion and proton response and longitudinal shower profiles
up to 20 nuclear interaction lengths with the ATLAS Tile calorimeter
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS
SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
LA English
DT Article
DE Calorimeter; Test-beam; ATLAS; Monte Carlo simulation; GEANT4; Hadronic
shower development; Pion-proton response; Longitudinal shower profile
for hadrons
ID HADRON CALORIMETRY; CASCADE; PHOTON
AB The response of pions and protons in the energy range of 20-180 GeV, produced at CERN's SPS H8 test-beam line in the ATLAS iron-scintillator Tile hadron calorimeter, has been measured. The test-beam configuration allowed the measurement of the longitudinal shower development for pions and protons up to 20 nuclear interaction lengths. It was found that pions penetrate deeper in the calorimeter than protons. However, protons induce showers that are wider laterally to the direction of the impinging particle. Including the measured total energy response, the pion-to-proton energy ratio and the resolution, all observations are consistent with a higher electromagnetic energy fraction in pion-induced showers. The data are compared with GEANT4 simulations using several hadronic physics lists. The measured longitudinal shower profiles are described by an analytical shower parametrization within an accuracy of 5-10%. The amount of energy leaking out behind the calorimeter is determined and parametrized as a function of the beam energy and the calorimeter depth. This allows for a leakage correction of test-beam results in the standard projective geometry. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Hakobyan, H.; Simonyan, M.] Yerevan Phys Inst, Yerevan 375036, Armenia.
[Adragna, P.; Cascella, M.; Cavasinni, V.; Costanzo, D.; Del Prete, T.; Dotti, A.; Flaminio, V.; Lupi, A.; Mazzoni, E.; Roda, C.; Sarri, F.; Usai, G.; Vivarelli, I.] Univ Pisa, Pisa, Italy.
[Adragna, P.; Cascella, M.; Cavasinni, V.; Costanzo, D.; Del Prete, T.; Dotti, A.; Flaminio, V.; Lupi, A.; Mazzoni, E.; Roda, C.; Sarri, F.; Usai, G.; Vivarelli, I.] Ist Nazl Fis Nucl, Pisa, Italy.
[Alexa, C.; Boldea, V.; Caprini, M.; Constantinescu, S.; Dita, S.; Pantea, D.] Natl Inst Phys & Nucl Engn, Bucharest, Romania.
[Anderson, K.; Gupta, A.; Hurwitz, M.; Jen-La Plante, I.; Merritt, F.; Oreglia, M.; Pilcher, J.; Sanders, H.; Shochet, M.; Tang, F.; Teuscher, R.] Univ Chicago, Chicago, IL 60637 USA.
[Antonaki, A.; Arabidze, A.; Fassouliotis, D.; Giakoumopoulou, V.; Giokaris, N.; Lembesi, M.; Manousakis, A.] Univ Athens, Athens, Greece.
[Batkova, L.; Stavina, P.; Sykora, I.; Tokar, S.; Zenis, T.] Comenius Univ, Bratislava, Slovakia.
[Batusov, V.; Budagov, J.; Khramov, J.; Khubua, J.; Kulchitsky, Y.; Liablin, M.; Lomakin, Y.; Maliukov, S.; Minashvili, I.; Romanov, V.; Russakovich, N.; Sissakian, A.; Topilin, N.; Tsiareshka, P.; Vinogradov, V.] JINR, Dubna, Russia.
[Beck, H. P.; Gadomski, S.; Haeberli, C.] Univ Bern, High Energy Phys Lab, CH-3012 Bern, Switzerland.
[Kuutmann, E. Bergeaas; Bohm, C.; Clement, C.; Eriksson, D.; Gellerstedt, K.; Hellman, S.; Holmgren, S.; Jon-And, K.; Lesser, J.; Nordkvist, B.; Ramstedt, M.; Sellden, B.; Sjolin, J.; Tylmad, M.] Stockholm Univ, S-10691 Stockholm, Sweden.
[Biscarat, C.; Calvet, D.; Febbraro, R.; Ferdi, C.; Garde, V.; Grenier, P.; Gris, P.; Guicheney, C.; Lefevre, R.; Martin, F.; Montarou, G.; Pallin, D.; Podlyski, F.; Rosnet, P.; Roy, P.; Santoni, C.; Says, L. -P.; Vazeille, F.] Univ Clermont Ferrand, LPC Clermont Ferrand, Clermont Ferrand, France.
[Bosman, M.; Cavalli-Sforza, M.; Iglesias, C.; Korolkov, I.; Miralles, L.; Norniella, O.; Portell, X.; Salto, O.; Volpi, M.] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain.
[Bogush, A.; Kulchitsky, Y.; Kurochkin, Yu.; Satsunkevitch, I.; Tsiareshka, P.] Natl Acad Sci, Inst Phys, Minsk, Byelarus.
[Bromberg, C.; Huston, J.; Miller, R.; Richards, R.] Michigan State Univ, E Lansing, MI 48824 USA.
[Blanchot, G.; Burckhart-Chromek, D.; Carli, T.; Cobal, M.; Corso-Radu, A.; Davidek, T.; Di Girolamo, B.; Dobson, M.; Efthymiopoulos, I.; Francis, D.; Gameiro, S.; Gildemeister, O.; Gollub, N.; Gorini, B.; Grenier, P.; Gruwe, M.; Henriques, A.; Joos, M.; Lehmann, G.; Mapelli, L.; Martin, F.; Nessi, M.; Petersen, J.; Pribyl, L.; Schlager, G.; Tremblet, L.; Unel, G.] CERN, Geneva, Switzerland.
[Caloba, L.; Cerqueira, A. S.; Damazio, D. O.; Maidanchik, C.; Marroquim, F.; Seixas, J. M.; Da Silva, P.] COPPE EE UFRJ, Rio De Janeiro, Brazil.
[Carvalho, J.; Pinhao, J.] Univ Coimbra, LIP, P-3000 Coimbra, Portugal.
[Carvalho, J.; Pinhao, J.] Univ Coimbra, FCTUC, P-3000 Coimbra, Portugal.
[Castelo, J.; Castillo, M. V.; Cuenca, C.; Ferrer, A.; Fullana, E.; Gonzalez, V.; Higon, E.; Poveda, J.; Ruiz, A.; Salvachua, B.; Sanchis, E.; Solans, C.; Torres, J.; Valero, A.; Valls, J. A.] Univ Valencia, Ctr Mixto, IFIC, E-46100 Burjassot, Spain.
[Cogswell, F.; Downing, R.; Errede, D.; Errede, S.; Haney, M.; Junk, T.; Khandanyan, H.; Simaitis, V.; Vichou, I.] Univ Illinois, Urbana, IL 61801 USA.
[Gomes, A.; Maio, A.; Marques, C.; Pina, J.; Saraiva, J. G.; Silva, J.] Univ Lisbon, LIP, P-1699 Lisbon, Portugal.
[Gomes, A.; Maio, A.; Marques, C.; Pina, J.; Saraiva, J. G.; Silva, J.] Univ Lisbon, FCUL, P-1699 Lisbon, Portugal.
[Davidek, T.; Krivkova, P.; Leitner, R.; Novakova, J.; Suk, M.; Tas, P.; Valkar, S.] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic.
[Bromberg, C.; Huston, J.; Miller, R.; Richards, R.] Univ Texas Arlington, Arlington, TX 76019 USA.
[Djobava, T.; Khubua, J.; Mosidze, M.] Tbilisi State Univ, HEPI, GE-380086 Tbilisi, Rep of Georgia.
[Fenyuk, A.; Isaev, A.; Karyukhin, A.; Makouski, M.; Miagkov, A.; Myagkov, A.; Shalanda, N.; Solodkov, A.; Solovyanov, O.; Starchenko, E.; Zaitsev, A.; Zenine, A.] Inst High Energy Phys, Protvino, Russia.
[Gilewsky, V.; Kuzhir, P.; Rumiantsev, V.; Shevtsov, P.; Starovoitov, P.] Natl Ctr Particles & High Energy Phys, Minsk, Byelarus.
[Guarino, V.; Le Compte, T.; Nodulman, L.; Price, L. E.; Proudfoot, J.; Schlereth, J.; Stanek, R.; Underwood, D.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Kazarov, A.; Kolos, S.; Soloviev, I.] PNPI, Gatchina, Russia.
[Lokajicek, M.; Nemecek, S.; Pribyl, L.] Acad Sci Czech Republic, Inst Phys, Prague, Czech Republic.
[Onofre, A.] Univ Catolica Figueira Foz, Figueira Foz, Portugal.
[Unel, G.] Univ Calif Irvine, Irvine, CA 92717 USA.
[Spano, F.] Columbia Univ, Nevis Labs, Irvington, NY 10533 USA.
RP Simonyan, M (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
EM Margar.Simonyan@cern.ch
RI Lokajicek, Milos/G-7800-2014; Bosman, Martine/J-9917-2014; Alexa,
Calin/F-6345-2010; Nemecek, Stanislav/C-3487-2012; Ferrer,
Antonio/H-2942-2015; Torres, Jose/H-3231-2015; Kuzhir,
Polina/H-8653-2012; Gonzalez Millan, Vicente/J-3023-2012; Cascella,
Michele/B-6156-2013; Ruiz, Alberto/E-4473-2011; Pina, Joao /C-4391-2012;
De, Kaushik/N-1953-2013; Nemecek, Stanislav/G-5931-2014; Cavalli-Sforza,
Matteo/H-7102-2015; Carvalho, Joao/M-4060-2013; Fullana Torregrosa,
Esteban/A-7305-2016; SANCHIS, ENRIQUE/J-7348-2016; Solodkov,
Alexander/B-8623-2017; Zaitsev, Alexandre/B-8989-2017; Karyukhin,
Andrey/J-3904-2014;
OI Bosman, Martine/0000-0002-7290-643X; Ferrer,
Antonio/0000-0003-0532-711X; Torres, Jose/0000-0002-1525-1828; Kuzhir,
Polina/0000-0003-3689-0837; Gonzalez Millan,
Vicente/0000-0001-6014-2586; Cascella, Michele/0000-0003-2091-2501;
Ruiz, Alberto/0000-0002-3639-0368; Pina, Joao /0000-0001-8959-5044; De,
Kaushik/0000-0002-5647-4489; Carvalho, Joao/0000-0002-3015-7821; Fullana
Torregrosa, Esteban/0000-0003-3082-621X; SANCHIS,
ENRIQUE/0000-0002-9689-9131; Solodkov, Alexander/0000-0002-2737-8674;
Zaitsev, Alexandre/0000-0002-4961-8368; Maio,
Amelia/0000-0001-9099-0009; Karyukhin, Andrey/0000-0001-9087-4315;
Gomes, Agostinho/0000-0002-5940-9893; Mendes Saraiva, Joao
Gentil/0000-0002-7006-0864; Beck, Hans Peter/0000-0001-7212-1096;
IGLESIAS FERNANDEZ, CARLOS ANGEL/0000-0002-1755-2712
NR 27
TC 23
Z9 23
U1 1
U2 7
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-9002
J9 NUCL INSTRUM METH A
JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc.
Equip.
PD APR 1
PY 2010
VL 615
IS 2
BP 158
EP 181
DI 10.1016/j.nima.2010.01.037
PG 24
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Nuclear; Physics, Particles & Fields
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 578NG
UT WOS:000276299900002
ER
PT J
AU Robertson, D
Baker, J
Bowers, M
Collon, P
Heise, J
Keeter, K
Schmitt, C
Tatar, E
Taylor, C
Lu, W
AF Robertson, D.
Baker, J.
Bowers, M.
Collon, P.
Heise, J.
Keeter, K.
Schmitt, C.
Tatar, E.
Taylor, C.
Lu, W.
TI Ultra-low measurements of K-40 for SNO+ utilizing accelerator mass
spectrometry - Proof of principle
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE AMS; SNO; MANTIS; Neutrino; Background counting
AB To increase sensitivity, experiments studying rare processes such as neutrino and dark matter interactions are forced underground to achieve the ultra-low levels of radioactive background they require. In conjunction with this, Accelerator Mass Spectrometry (AMS) can be used to help select the ultra-high purity and low background required for detector materials. One project interested in such techniques is SNO+ (Sudbury Neutrino Observatory), which proposes modifying the existing SNO detector set-up to study low-energy solar neutrinos as well as other neutrino properties via double-beta decay using a liquid scintillator called linear alkylbenzene (LAB). Due to the lower energy threshold of the proposed set-up, the present materials need to be re-evaluated for K-40 concentrations. Ultra-pure copper cathodes and sample materials to be used in the new detector system were prepared at Idaho State University and Idaho National Laboratory. These materials are being tested for levels of K-40 at the Notre Dame AMS facility. Proof of principle and results from the first set of measurements are discussed in this paper. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Robertson, D.; Bowers, M.; Collon, P.; Schmitt, C.; Lu, W.] Univ Notre Dame, Nucl Sci Lab, Notre Dame, IN 46556 USA.
[Baker, J.] Idaho Natl Lab, Idaho Falls, ID 83415 USA.
[Heise, J.] Queens Univ, Dept Phys, Kingston, ON KL7 3N6, Canada.
[Keeter, K.; Tatar, E.; Taylor, C.] Idaho State Univ, Dept Phys, Pocatello, ID 83209 USA.
RP Robertson, D (reprint author), Univ Notre Dame, Nucl Sci Lab, 124 Nieuwland Sci Hall, Notre Dame, IN 46556 USA.
EM drobert4@nd.edu
NR 8
TC 0
Z9 0
U1 0
U2 4
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 718
EP 721
DI 10.1016/j.nimb.2009.10.013
PG 4
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300009
ER
PT J
AU Rood, DH
Hall, S
Guilderson, TP
Finkel, RC
Brown, TA
AF Rood, Dylan H.
Hall, Sarah
Guilderson, Thomas P.
Finkel, Robert C.
Brown, Thomas A.
TI Challenges and opportunities in high-precision Be-10 measurements at
CAMS
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE AMS; Ion source; Efficiency; Beryllium-10
ID ION-SOURCE; CAMS/LLNL
AB We determined the overall efficiency for Be-10 of the high-intensity LLNL modified Middleton cesium sputter source in combination with the CAMS FN mass spectrometer. BeO- ionization efficiency is >3%. Charge exchange efficiency including transmission through the tandem for 7.5 MeV Be+3 is similar to 34%, resulting in a total system efficiency of just over 1%. At this efficiency and with very low backgrounds, we estimate our detection limit to be similar to 1000 Be-10 atoms. Cathodes prepared with only similar to 80 mu g of Be-9 show only an similar to 33% reduction in Be-9 beam current compared to a sample with similar to 200 mu g. These same samples, prepared from 07KNSTD1032 standard material, contained 1 x 10(7) and 5 x 10(6) Be-10 atoms and exhibited similar ionization and total system efficiency. These results demonstrate the feasibility of pursuing applications that require precise measurement of samples with low Be-10 concentrations and/or small sample size. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Rood, Dylan H.; Guilderson, Thomas P.; Brown, Thomas A.] Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA.
[Rood, Dylan H.] Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA.
[Hall, Sarah] Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA.
[Guilderson, Thomas P.] Univ Calif Santa Cruz, Dept Ocean Sci, Santa Cruz, CA 95064 USA.
[Guilderson, Thomas P.] Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA.
[Finkel, Robert C.] CEREGE, F-13545 Aix En Provence 4, France.
[Finkel, Robert C.] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA.
RP Rood, DH (reprint author), Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA.
EM rood5@llnl.gov
NR 5
TC 41
Z9 41
U1 0
U2 6
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 730
EP 732
DI 10.1016/j.nimb.2009.10.016
PG 3
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300012
ER
PT J
AU Buchholz, BA
Biegalski, SR
Whitney, SM
Tumey, SJ
Weaver, CJ
AF Buchholz, Bruce A.
Biegalski, Steven R.
Whitney, Scott M.
Tumey, Scott J.
Weaver, C. Jordan
TI Basis for developing samarium AMS for fuel cycle analysis
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE Nuclear fuel cycle; Fission products; Sm-146; AMS; Samarium; ORIGEN
ID ACCELERATOR MASS-SPECTROMETRY; NUCLEAR-FUELS; SEPARATION; LANTHANIDE;
EXTRACTION; SMH2-SMH3; NEODYMIUM; SYSTEMS; BONDS; CA-41
AB Modeling of nuclear reactor fuel burnup indicates that the production of samarium isotopes can vary significantly with reactor type and fuel cycle. The isotopic concentrations of Sm-146, Sm-149, and Sm-151 are potential signatures of fuel reprocessing, if analytical techniques can overcome the inherent challenges of lanthanide chemistry, isobaric interferences, and mass/charge interferences. We review the current limitations in measurement of the target samarium isotopes and describe potential approaches for developing Sm-AMS. AMS sample form and preparation chemistry will be discussed as well as possible spectrometer operating conditions. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Buchholz, Bruce A.; Tumey, Scott J.] LLNL, CAMS L397, Livermore, CA 94551 USA.
[Biegalski, Steven R.; Whitney, Scott M.; Weaver, C. Jordan] Univ Texas Austin, Nucl Engn Teaching Lab, Austin, TX 78741 USA.
RP Buchholz, BA (reprint author), LLNL, CAMS L397, 7000 East Ave, Livermore, CA 94551 USA.
EM bbuchholz@llnl.gov
RI Buchholz, Bruce/G-1356-2011
NR 32
TC 4
Z9 4
U1 0
U2 2
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 773
EP 775
DI 10.1016/j.nimb.2009.10.027
PG 3
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300023
ER
PT J
AU Galindo-Uribarri, A
Havener, CC
Lewis, TL
Liu, Y
AF Galindo-Uribarri, A.
Havener, C. C.
Lewis, T. L.
Liu, Y.
TI Selective isobar suppression for accelerator mass spectrometry and
radioactive ion-beam science
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE Photodetachment; Isobar suppression; RF quadrupole ion guide
ID NEGATIVE-IONS; FISSION FRAGMENTS
AB A new method of selective isobar suppression by photodetachment in a radio-frequency quadrupole ion cooler is being developed at HRIBF with a twofold purpose: (1) increasing the AMS sensitivity for certain isotopes of interest and (2) purifying radioactive ion beams for nuclear science. The potential of suppressing the S-36 contaminants in a Cl-36 beam using this method has been explored with stable S- and Cl- ions and a Nd:YLF laser. In the study, the laser beam was directed along the experiment's beam line and through a RF quadrupole ion cooler. Negative S-32 and Cl-35 ions produced by a Cs sputter ion source were focused into the ion cooler where they were slowed by collisions with He buffer gas; this increased the interaction time between the negative-ion beam and the laser beam. As a result, suppression of S- by a factor of 3000 was obtained with about 2.5W average laser power in the cooler while no reduction in Cl- current was observed. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Galindo-Uribarri, A.; Havener, C. C.; Liu, Y.] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA.
[Galindo-Uribarri, A.; Lewis, T. L.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
RP Galindo-Uribarri, A (reprint author), Oak Ridge Natl Lab, Div Phys, POB 2008,MS 6368, Oak Ridge, TN 37831 USA.
EM uribarri@ornl.gov
NR 20
TC 7
Z9 7
U1 0
U2 3
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 834
EP 838
DI 10.1016/j.nimb.2009.10.043
PG 5
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300039
ER
PT J
AU Merchel, S
Benedetti, L
Bourles, DL
Braucher, R
Dewald, A
Faestermann, T
Finkel, RC
Korschinek, G
Masarik, J
Poutivtsev, M
Rochette, P
Rugel, G
Zell, KO
AF Merchel, S.
Benedetti, L.
Bourles, D. L.
Braucher, R.
Dewald, A.
Faestermann, T.
Finkel, R. C.
Korschinek, G.
Masarik, J.
Poutivtsev, M.
Rochette, P.
Rugel, G.
Zell, K. -O.
TI A multi-radionuclide approach for in situ produced terrestrial
cosmogenic nuclides: Be-10, Al-26, Cl-36 and Ca-41 from carbonate rocks
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE Accelerator mass spectrometry; Terrestrial cosmogenic nuclides (TCN);
Cosmogenic nuclide exposure dating
AB In contrary to siliceous environments, there is a severe lack of cosmogenic nuclides, that can be used for in situ dating of calcareous environments. Thus, we have investigated other nuclides than Cl-36 as possible dating tools by cross-calibration. Cosmogenic Be-10 is highly contaminated with atmospheric Be-10 and cannot be removed quantitatively, even by a very sophisticated chemical cleaning procedure. Only working on clay-free calcite provides correct Be-10 data, giving a 2.7 times higher production rate of Be-10 from CaCO3 than from SiO2. Though, the production rate of Al-26 is only similar to 4.6% (CaCO3 relative to SiO2), Al-26 can be easily determined in calcite, as the low intrinsic Al-27 concentration yields to nearly as high Al-26/Al-27 as within corresponding quartz. The measurement of Ca-41, mainly produced via thermal-neutron-capture, is hindered by very low Ca-41/Ca:<5 x 10(-15). (C) 2009 Elsevier B.V. All rights reserved.
C1 [Merchel, S.] Forschungszentrum Dresden Rossendorf, D-01314 Dresden, Germany.
[Merchel, S.; Benedetti, L.; Bourles, D. L.; Braucher, R.; Finkel, R. C.; Rochette, P.] Univ Aix Marseille, CNRS IRD, CEREGE, F-13545 Aix En Provence, France.
[Dewald, A.; Zell, K. -O.] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany.
[Faestermann, T.; Korschinek, G.; Poutivtsev, M.; Rugel, G.] Tech Univ Munich, D-85748 Garching, Germany.
[Finkel, R. C.] Lawrence Livermore Natl Lab, CAMS, Livermore, CA 94550 USA.
[Finkel, R. C.] Univ Calif Berkeley, Berkeley, CA 94720 USA.
[Masarik, J.] Comenius Univ, Dept Nucl Phys, SK-84215 Bratislava, Slovakia.
RP Merchel, S (reprint author), Forschungszentrum Dresden Rossendorf, D-01314 Dresden, Germany.
EM s.merchel@fzd.de
RI Dewald, Alfred/O-5810-2015;
OI Faestermann, Thomas/0000-0002-6603-8787; Bourles,
Didier/0000-0001-5991-6126; Braucher, Regis/0000-0002-4637-4302
NR 25
TC 11
Z9 11
U1 1
U2 13
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 1179
EP 1184
DI 10.1016/j.nimb.2009.10.128
PG 6
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300123
ER
PT J
AU Welten, KC
Caffee, MW
Hillegonds, DJ
Masarik, J
Nishiizumi, K
AF Welten, K. C.
Caffee, M. W.
Hillegonds, D. J.
Masarik, J.
Nishiizumi, K.
TI Identifying large chondrites using cosmogenic radionuclides
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE Cosmogenic radionuclides; Chondrites; Production rates; Pre-atmospheric
size; Model calculations
ID FRONTIER MOUNTAIN; EXPOSURE HISTORY; NUCLIDES; METEORITES; BE-10
AB We measured the concentrations of the cosmogenic radionuclides Be-10, Al-26, Cl-36 and Ca-41 in the metal and stone fractions of three large chondrite showers to determine their pre-atmospheric size. Large chondrites are characterized by substantial contributions of neutron-capture Ca-41 in the stone fraction (up to similar to 2 dpm/gCa), low radionuclide concentrations in the metal fraction and high Be-10(stone)/Be-10(metal) ratios. Based on the measured concentrations in comparison with calculated cosmogenic nuclide depth profiles, using a semi-empirical and a purely physical model, we conclude that these objects had pre-atmospheric radii ranging from similar to 80 cm to >3 m. We conclude that the semi-empirical model is more reliable for spallogenic production rates in large objects, while the purely physical model is more reliable for neutron-capture products. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Caffee, M. W.] Purdue Univ, PRIME Lab, W Lafayette, IN 47907 USA.
[Welten, K. C.; Nishiizumi, K.] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
[Hillegonds, D. J.] Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA.
[Masarik, J.] Comenius Univ, Dept Nucl Phys, Bratislava, Slovakia.
RP Caffee, MW (reprint author), Purdue Univ, PRIME Lab, W Lafayette, IN 47907 USA.
EM mcaffee@purdue.edu
RI Caffee, Marc/K-7025-2015
OI Caffee, Marc/0000-0002-6846-8967
NR 17
TC 4
Z9 4
U1 1
U2 8
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 1185
EP 1188
DI 10.1016/j.nimb.2009.10.129
PG 4
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300124
ER
PT J
AU Cornett, RJ
Fabryka-Martin, J
Cramer, JJ
Andrew, HR
Koslowsky, VT
AF Cornett, R. J.
Fabryka-Martin, J.
Cramer, J. J.
Andrew, H. R.
Koslowsky, V. T.
TI Cl-36 production and mobility in the Cigar Lake uranium deposit
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE Chlorine-36; Cl-36; Uranium deposit; Hydrogeology; Neutron activation
ID NORTHERN SASKATCHEWAN; CHALK-RIVER
AB Can accelerator mass spectrometry (AMS) studies validate risk assessments of the long-term behaviour of contaminants such as radionuclides? AMS measurements on samples from the 1.3 billion-year-old Cigar Lake uranium ore deposit provide one approach to address this question. In Cigar Lake, elevated concentrations of uranium enhance the in situ neutron flux that produces Cl-36 and other radionuclides. We calculated the production of Cl-36 using a Monte Carlo neutron transport code. We then tested for the loss of Cl-36 from ore samples collected from an 8 m stratigraphic section through the deposit by comparing the predicted values (assuming equilibrium between production and decay) with the concentrations measured by AMS. The Cl-36:Cl atom ratios within the ore were more than two orders of magnitude higher than in the surrounding host rock and ranged from 4 to 64 x 10(-12). The Cl-36 concentrations in the ore, rock, clay and fracture infilling minerals all agree with the values predicted by the Monte Carlo simulations. We conclude that Cl-36 has very limited mobility. Even in matrix adjacent to more permeable fractures, there is no evidence that the measured isotopic ratios deviate significantly from the predicted values. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Cornett, R. J.; Cramer, J. J.] Hlth Canada, Radiat Protect Bur, Ottawa, ON K0A 1T0, Canada.
[Fabryka-Martin, J.] Los Alamos Natl Lab, Environm Sci & Waste Technol Grp, Los Alamos, NM 87545 USA.
[Andrew, H. R.; Koslowsky, V. T.] Bubble Technol Ind, Chalk River, ON K0J 1J0, Canada.
RP Cornett, RJ (reprint author), Hlth Canada, Radiat Protect Bur, 775 Brookfield Rd,AL 6302A, Ottawa, ON K0A 1T0, Canada.
EM jack_cornett@hc-sc.gc.ca
NR 19
TC 1
Z9 1
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 1189
EP 1192
DI 10.1016/j.nimb.2009.10.130
PG 4
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300125
ER
PT J
AU Links, J
Palmblad, M
Ognibene, T
Turteltaub, K
Bench, G
AF Links, Jennifer
Palmblad, Magnus
Ognibene, Ted
Turteltaub, Ken
Bench, Graham
TI Quantitative metabolism using AMS: Choosing a labeled precursor
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE AMS; Biology; Cell labeling; Glucose; HPLC; Metabolism; NAD; Yeast
ID ACCELERATOR MASS-SPECTROMETRY; DNA ADDUCT FORMATION; BIOCHEMICAL
SAMPLES; MEIQX; PHIP; QUANTIFICATION; RODENT; TISSUE; C-14
AB Biological radioisotope studies suffer from a lack of sensitive measurement techniques and therefore traditionally require large amounts of labeled material to produce a measurable signal. Such quantities of materials are often significantly higher than naturally-occurring levels preventing these studies from replicating physiological conditions. AMS affords the sensitivity necessary to perform biological radioisotope studies with low levels of labeled material that preserve physiological conditions. The choice of labeled material can substantially affect the ease of interpretation and comprehensiveness of these studies. Here, the benefits and limitations of whole-cell labeling with C-14-glucose and targeted pathway labeling with C-14-nicotinic acid are discussed and compared. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Links, Jennifer; Ognibene, Ted; Turteltaub, Ken; Bench, Graham] Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry L397, Livermore, CA 94551 USA.
[Palmblad, Magnus] Leiden Univ, Dept Parasitol, Leiden, Netherlands.
RP Bench, G (reprint author), Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry L397, 7000 East Ave, Livermore, CA 94551 USA.
EM bench1@llnl.gov
RI Palmblad, Magnus/B-8649-2016
OI Palmblad, Magnus/0000-0002-5865-8994
FU NCRR NIH HHS [P41 RR013461, P41 RR013461-11]; NIGMS NIH HHS [P41
GM103483]
NR 19
TC 0
Z9 0
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
EI 1872-9584
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 1309
EP 1312
DI 10.1016/j.nimb.2009.10.160
PG 4
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300155
PM 20368758
ER
PT J
AU Buchholz, BA
Haack, KW
Sporty, JL
Buckpitt, AR
Morin, D
AF Buchholz, Bruce A.
Haack, Kurt W.
Sporty, Jennifer L.
Buckpitt, Alan R.
Morin, Dexter
TI Free flow electrophoresis separation and AMS quantitation of
C-14-naphthalene-protein adducts
SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM
INTERACTIONS WITH MATERIALS AND ATOMS
LA English
DT Article; Proceedings Paper
CT 11th International Conference on Accelerator Mass Spectrometry
CY SEP 14-19, 2008
CL Rome, ITALY
SP CEDAD, Univ Salento, CIRCE, Second Univ Naples, INNOVA, LABEC, Ist Nazl Fis Nucl, Abdul Salam Int Ctr Theoret Phys
DE Free flow electrophoresis; FEE; AMS; Protein separation
ID ACCELERATOR MASS-SPECTROMETRY; POLYCYCLIC AROMATIC-HYDROCARBONS;
BIOCHEMICAL SAMPLES; HUMAN URINE; NAPHTHALENE; METABOLITES; EXPOSURE;
RATS; C-14; GRAPHITE
AB Naphthalene is a volatile aromatic hydrocarbon to which humans are exposed from a variety of sources including mobile air sources and cigarette smoke. Naphthalene produces dose-(concentration)dependent injury to airway epithelial cells of murine lung which is observed at concentrations well below the current occupational exposure standard. Toxicity is dependent upon the cytochrome P450 mediated metabolic activation of the parent substrate to unstable metabolites which become bound covalently to tissue proteins. Nearly 70 proteins have been identified as forming adducts with reactive naphthalene metabolites using in vitro systems but very little work has been conducted in vivo because reasonably large amounts (100 mu Ci) of (14C) labeled parent compound must be administered to generate detectable adduct levels on storage phosphor screens following separation of labeled proteins by 2D gel electrophoresis. The work described here was done to provide proof of concept that protein separation by free flow electrophoresis followed by AMS detection of protein fractions containing protein bound reactive metabolites would provide adducted protein profiles in animals dosed with trace quantities of labeled naphthalene. Mice were administered 200 mg/kg naphthalene intraperitoneally at a calculated specific activity of 2 DPM/nmol (1 pCi/nmol) and respiratory epithelial tissue was obtained by lysis lavage 4 h post injection. Free flow electrophoresis (FFE) separates proteins in the liquid phase over a large pH range (2.5-11.5) using low molecular weight acids and bases to modify the pH. The apparatus separates fractions into standard 96-well plates that can be used in other protein analysis techniques. The buffers of the fractions have very high carbon content, however, and need to be dialyzed to yield buffers compatible with C-14-AMS. We describe the processing techniques required to couple FFE to AMS for quantitation of protein adducts. Published by Elsevier B.V.
C1 [Buchholz, Bruce A.; Haack, Kurt W.; Sporty, Jennifer L.] LLNL, Ctr AMS, Livermore, CA 94551 USA.
[Buckpitt, Alan R.; Morin, Dexter] Univ Calif Davis, Sch Vet Med, Dept Mol Biosci, Davis, CA 95616 USA.
RP Buchholz, BA (reprint author), LLNL, Ctr AMS, 7000 East Ave, Livermore, CA 94551 USA.
EM bbuchholz@llnl.gov
RI Buchholz, Bruce/G-1356-2011
FU NCRR NIH HHS [P41 RR013461, P41 RR013461-10]; NIEHS NIH HHS [P42
ES004699, P42 ES004699-23S49004]; NIGMS NIH HHS [P41 GM103483]
NR 20
TC 3
Z9 3
U1 0
U2 4
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0168-583X
J9 NUCL INSTRUM METH B
JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms
PD APR
PY 2010
VL 268
IS 7-8
BP 1324
EP 1327
DI 10.1016/j.nimb.2009.10.164
PG 4
WC Instruments & Instrumentation; Nuclear Science & Technology; Physics,
Atomic, Molecular & Chemical; Physics, Nuclear
SC Instruments & Instrumentation; Nuclear Science & Technology; Physics
GA 593NI
UT WOS:000277462300159
PM 20454606
ER
PT J
AU Xi, WZ
Seidel, J
Kakareka, JW
Pohida, TJ
Milenic, DE
Proffitt, J
Majewski, S
Weisenberger, AG
Green, MV
Choyke, PL
AF Xi, Wenze
Seidel, Jurgen
Kakareka, John W.
Pohida, Thomas J.
Milenic, Diane E.
Proffitt, James
Majewski, Stan
Weisenberger, Andrew G.
Green, Michael V.
Choyke, Peter L.
TI MONICA: a compact, portable dual gamma camera system for mouse
whole-body imaging
SO NUCLEAR MEDICINE AND BIOLOGY
LA English
DT Article
DE MONICA; Small animal imaging; Cancer drug development; Mouse whole-body
imaging; Miniature gamma cameras; Single photon imaging
AB Introduction: We describe a compact, portable dual-gamma camera system (named "MONICA" for MObile Nuclear Imaging CAmeras) for visualizing and analyzing the whole-body biodistribution of putative diagnostic and therapeutic single photon emitting radiotracers in animals the size of mice.
Methods: Two identical, miniature pixelated Na(TI) gamma cameras were fabricated and installed "looking up" through the tabletop of a compact portable cart. Mice are placed directly on the tabletop for imaging. Camera imaging performance was evaluated with phantoms and field performance was evaluated in a weeklong In-111 imaging study performed in a mouse tumor xenograft model.
Results: Tc-99m performance measurements, using a photopeak energy window of 140 keV +/- 10%, yielded the following results: spatial resolution (FWHM at 1 cm), 2.2 mm; sensitivity, 149 cps (counts per seconds)/MBq (5.5 cps/mu Ci); energy resolution (FWHM, full width at half maximum). 10.8%; count rate linearity (count rate vs. activity), r(2)=0.99 for 0-185 MBq (0-5 mCi) in the field of view (FOV); spatial uniformity, <3% count rate variation across the FOV. Tumor and whole-body distributions of the In-111 agent were well visualized in all animals in 5-min images acquired throughout the 168-h study period.
Conclusion: Performance measurements indicate that MONICA is well suited to whole-body single photon mouse imaging. The field study suggests that inter-device communications and user-oriented interfaces included in the MONICA design facilitate use of the system in practice. We believe that MONICA may be particularly useful early in the (cancer) drug development cycle where basic whole-body biodistribution data can direct future development of the agent under study and where logistical factors, e.g., limited imaging space, portability and, potentially, cost are important. (C) 2010 Elsevier Inc. All rights reserved.
C1 [Xi, Wenze; Seidel, Jurgen; Green, Michael V.; Choyke, Peter L.] Natl Canc Inst, Mol Imaging Program, Ctr Canc Res, NIH, Bethesda, MD 20892 USA.
[Xi, Wenze; Seidel, Jurgen; Green, Michael V.] Sci Applicat Int Corp, Frederick, MD USA.
[Kakareka, John W.; Pohida, Thomas J.] NIH, Signal Proc & Instrumentat Sect, Div Computat Biosci, Ctr Informat Technol, Bethesda, MD 20892 USA.
[Milenic, Diane E.] Natl Canc Inst, Radioimmune & Inorgan Chem Sect, Radiat Oncol Branch, Ctr Canc Res,NIH, Bethesda, MD 20892 USA.
[Proffitt, James] Adapt IO Technol, Blacksburg, VA USA.
[Majewski, Stan] W Virginia Univ, Dept Radiol, Morgantown, WV 26506 USA.
[Weisenberger, Andrew G.] Thomas Jefferson Natl Accelerator Facil, Radiat Detectors & Imaging Grp, Newport News, VA USA.
RP Choyke, PL (reprint author), Natl Canc Inst, Mol Imaging Program, Ctr Canc Res, NIH, Bethesda, MD 20892 USA.
EM pchoyke@mail.nih.gov
OI Kakareka, John/0000-0003-0072-0035
FU National Cancer Institute, National Institutes of Health
[HHSN261200800001E]
FX Financial support: This project has been funded in whole or in part with
federal funds from the National Cancer Institute, National Institutes of
Health, under contract HHSN261200800001E. The content of this
publication does not necessarily reflect the views or policies of the
Department of Health and Human Services, nor does mention of trade
names, commercial products or organizations imply endorsement by the
U.S. Government.
NR 9
TC 12
Z9 12
U1 1
U2 2
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0969-8051
J9 NUCL MED BIOL
JI Nucl. Med. Biol.
PD APR
PY 2010
VL 37
IS 3
BP 245
EP 253
DI 10.1016/j.nucmedbio.2009.12.003
PG 9
WC Radiology, Nuclear Medicine & Medical Imaging
SC Radiology, Nuclear Medicine & Medical Imaging
GA 581VB
UT WOS:000276551800002
PM 20346864
ER
PT J
AU Millener, DJ
AF Millener, D. J.
TI Shell-model structure of light hypernuclei
SO NUCLEAR PHYSICS A
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Hypernuclear and Strange Particle
Physics
CY SEP 14-18, 2009
CL Tokai, JAPAN
SP Kyoto Univ, Global COE Program, J PARC Ctr, Japan Soc Promot Sci, RIKEN, Nishina Ctr Accelerator Based Sci
DE Hypernuclei; Shell-model
ID GAMMA-RAY SPECTROSCOPY; P-SHELL; NUCLEI
AB The status of shell-model calculations that include both Lambda and Sigma configurations with p-shell cores to interpret gamma-ray transitions in (7)(Lambda)Li, (9)(Lambda)Be, (10)(Lambda)B, (12)(Lambda)C, (15)(Lambda)N, and (16)(Lambda)O observed with the Hyperball array of Ge detectors is discussed with an emphasis on new data for (12)(Lambda)C and (11)(Lambda)B from KEK E566.
C1 Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Millener, DJ (reprint author), Brookhaven Natl Lab, Upton, NY 11973 USA.
EM millener@bnl.gov
NR 18
TC 19
Z9 19
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0375-9474
J9 NUCL PHYS A
JI Nucl. Phys. A
PD APR 1
PY 2010
VL 835
IS 1-4
BP 11
EP 18
DI 10.1016/j.nuclphysa.2010.01.169
PG 8
WC Physics, Nuclear
SC Physics
GA 584RO
UT WOS:000276770500003
ER
PT J
AU Cusanno, F
Acha, A
Bydzovsky, P
Chang, CC
Cisbani, E
De Jager, CW
De Leo, R
Frullani, S
Garibaldi, F
Higinbotham, DW
Iodice, M
LeRose, JJ
Markowitz, P
Marrone, S
Sotona, M
Urciuoli, GM
AF Cusanno, F.
Acha, A.
Bydzovsky, P.
Chang, C. C.
Cisbani, E.
De Jager, C. W.
De Leo, R.
Frullani, S.
Garibaldi, F.
Higinbotham, D. W.
Iodice, M.
LeRose, J. J.
Markowitz, P.
Marrone, S.
Sotona, M.
Urciuoli, G. M.
CA Hall A Collaboration
TI Update of High Resolution (e, e ' K+) Hypernuclear Spectroscopy at
Jefferson Lab's Hall A
SO NUCLEAR PHYSICS A
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Hypernuclear and Strange Particle
Physics
CY SEP 14-18, 2009
CL Tokai, JAPAN
SP Kyoto Univ, Global COE Program, J PARC Ctr, Japan Soc Promot Sci, RIKEN, Nishina Ctr Accelerator Based Sci
DE Hypernuclei; Electroproduction reactions
ID STRANGENESS
AB Updated results of the experiment E94-107 hypernuclear spectroscopy in Hall A of the Thomas Jefferson National Accelerator Facility (Jefferson Lab), are presented. The experiment provides high resolution spectra of excitation energy for B-12(Lambda), N-16(Lambda), and Li-9(Lambda) hypernuclei obtained by electroproduction of strangeness. A new theoretical calculation for B-12(Lambda), final results for N-16(Lambda), and discussion of the preliminary results of Li-9(Lambda) are reported.
C1 [Cisbani, E.; Frullani, S.; Garibaldi, F.] Ist Nazl Fis Nucl, Sez Roma, Gr Sanita Coll, Rome, Italy.
[Acha, A.; Markowitz, P.] Florida Int Univ, Miami, FL 32306 USA.
[Bydzovsky, P.; Sotona, M.] Inst Nucl Phys, Rez Near Prague, Czech Republic.
[Chang, C. C.] Univ Maryland, College Pk, MD, Czech Republic.
[Cisbani, E.; Frullani, S.; Garibaldi, F.] Ist Super Sanita, I-00161 Rome, Italy.
[De Jager, C. W.; Higinbotham, D. W.; LeRose, J. J.] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
[De Leo, R.; Marrone, S.] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.
[De Leo, R.; Marrone, S.] Dipartimento Fis, Bari, Italy.
[Iodice, M.] Ist Nazl Fis Nucl, Sez Roma Tre, Rome, Italy.
RP Cusanno, F (reprint author), Tech Univ Munich, Phys Dept & Excellence Cluster Universe E12, D-8046 Garching, Germany.
EM cusanno@jlab.org
RI Higinbotham, Douglas/J-9394-2014; Cisbani, Evaristo/C-9249-2011;
Bydzovsky, Petr/G-8600-2014
OI Higinbotham, Douglas/0000-0003-2758-6526; Cisbani,
Evaristo/0000-0002-6774-8473;
NR 8
TC 15
Z9 15
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0375-9474
J9 NUCL PHYS A
JI Nucl. Phys. A
PD APR 1
PY 2010
VL 835
IS 1-4
BP 129
EP 135
DI 10.1016/j.nuclphysa.2010.01.185
PG 7
WC Physics, Nuclear
SC Physics
GA 584RO
UT WOS:000276770500019
ER
PT J
AU Gubler, P
Jido, D
Kojo, T
Nishikawa, T
Oka, M
AF Gubler, Philipp
Jido, Daisuke
Kojo, Toru
Nishikawa, Tetsuo
Oka, Makoto
TI S=+1 pentaquarks in QCD sum rules
SO NUCLEAR PHYSICS A
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Hypernuclear and Strange Particle
Physics
CY SEP 14-18, 2009
CL Tokai, JAPAN
SP Kyoto Univ, Global COE Program, J PARC Ctr, Japan Soc Promot Sci, RIKEN, Nishina Ctr Accelerator Based Sci
DE QCD sum rules; Pentaquark baryons
ID RESONANCE
AB We study pentaquark states with strangeness S = +1 and 1 J(pi) = 0(1)/(+/-)(2), 1(1)/(+/-)(2), 0(3)/(+/-)(2), 1(3)/(+/-)(2) within the QCD sum rule technique. In order to obtain reliable results with this method, it is indispensable to establish a valid Borel window, where the operator product expansion (OPE) converges and the presumed ground state pole dominates the sum rules. By constructing the sum rules from the difference of two carefully chosen independent correlators and calculating the OPE up to dimension 14, such a Borel window can be established. This then leads to our main conclusion that the state with qantum numbers 0(3)/(+)(2) appears to be the most probable candidate for the experimentally observed Theta(+)(1540). Furthermore, states with 0(1)/(+)(2), 1(1)/(-)(2), 0(3)/(+)(2), are also obtained at slightly higher mass regions.
C1 [Gubler, Philipp; Oka, Makoto] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan.
[Jido, Daisuke] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan.
[Kojo, Toru] Brookhaven Natl Lab, RBRC, Upton, NY 11973 USA.
[Nishikawa, Tetsuo] Ryotokuji Univ, Fac Hlth Sci, Chiba 2798567, Japan.
RP Gubler, P (reprint author), Tokyo Inst Technol, Dept Phys, Meguro Ku, H-27, Tokyo 1528551, Japan.
RI Gubler, Philipp/E-3094-2015
OI Gubler, Philipp/0000-0002-0991-8462
NR 7
TC 1
Z9 1
U1 0
U2 0
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0375-9474
J9 NUCL PHYS A
JI Nucl. Phys. A
PD APR 1
PY 2010
VL 835
IS 1-4
BP 342
EP 345
DI 10.1016/j.nuclphysa.2010.01.214
PG 4
WC Physics, Nuclear
SC Physics
GA 584RO
UT WOS:000276770500049
ER
PT J
AU Ikeda, Y
Kamano, H
Sato, T
AF Ikeda, Yoichi
Kamano, Hiroyuki
Sato, Toru
TI On the resonance energy of the strange dibaryon
SO NUCLEAR PHYSICS A
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Hypernuclear and Strange Particle
Physics
CY SEP 14-18, 2009
CL Tokai, JAPAN
SP Kyoto Univ, Global COE Program, J PARC Ctr, Japan Soc Promot Sci, RIKEN, Nishina Ctr Accelerator Based Sci
DE Many-body scattering and Faddeev equation; Kaon-baryon interactions
AB The three-body resonance energies of the strange dibaryon are studied with the (K) over bar NN - pi YN coupled-channels Faddeev equations. Our resonance energies are compared with those of an effective potential approach (EPA), where a coupling to the pi YN channel is simulated by an effective (K) over barN potential, and the spectator momentum in the pi YN Green function is neglected. About a 30% reduction of the binding energies due to neglecting the spectator momentum in the pi YN Green's function is observed.
C1 [Ikeda, Yoichi] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan.
[Ikeda, Yoichi] RIKEN, Inst Phys & Cem Res, Nishina Ctr Accelerator Based Sci, Wako, Saitama 3510198, Japan.
[Kamano, Hiroyuki] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
[Sato, Toru] Osaka Univ, Dept Phys, Osaka 5600043, Japan.
RP Ikeda, Y (reprint author), Univ Tokyo, Dept Phys, Tokyo 1130033, Japan.
NR 13
TC 0
Z9 0
U1 0
U2 0
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0375-9474
J9 NUCL PHYS A
JI Nucl. Phys. A
PD APR 1
PY 2010
VL 835
IS 1-4
BP 386
EP 389
DI 10.1016/j.nuclphysa.2010.01.225
PG 4
WC Physics, Nuclear
SC Physics
GA 584RO
UT WOS:000276770500060
ER
PT J
AU Fensin, ML
Hendricks, JS
Anghaie, S
AF Fensin, Michael L.
Hendricks, John S.
Anghaie, Samim
TI THE ENHANCEMENTS AND TESTING FOR THE MCNPX 2.6.0 DEPLETION CAPABILITY
SO NUCLEAR TECHNOLOGY
LA English
DT Article; Proceedings Paper
CT International Congress on Advances in Nuclear Power Plants (ICAPP)
CY JUN 08-12, 2008
CL Anaheim, CA
DE burnup; MCNPX; depletion
ID SYSTEM; CODE
AB Monte Carlo-linked depletion methods have gained recent interest due to the ability to model complex three-dimensional geometries using continuous-energy cross sections. The integration of CINDER90 into the MCNPX Monte Carlo radiation transport code provides a completely self-contained Monte Carlo-linked depletion capability in a single Monte Carlo code that is compatible with most nuclear criticality (KCODE) particle tracking features in MCNPX. MCNPX depletion tracks all necessary reaction rates and follows as many isotopes as cross-section data permit. The objective of this work is (a) describe the MCNPX depletion methodology dating from the original linking of MONTEBURNS and MCNP to the first public release of the integrated capability (MCNPX 2.6.B, June 2006) that has been reported previously, (b) further detail the many new depletion capability enhancements since then leading to the present Radiation Safety Information Computational Center (RSICC) release, MCNPX 2.6.0, (c) report calculation results for the H. B. Robinson benchmark, and (d) detail new features available in MCNPX 2.7.A.
Each version of MCNPX depletion starting from MCNPX 2.6.A leading to the official RSICC release of MCNPX 2.6.0 and the new beta release MCNPX 2.7.A included significant upgrades that addressed key issues from earlier versions. This paper details these key issues and the approach utilized to address the issues as enhancements for MCNPX 2.6.0. The MCNPX 2.6.0 depletion capability enhancements include (a) allowing the modeling of as large a system as computer memory capacity permits; (b) tracking every fission product available in ENDF/B VII.0; (c) enabling depletion in repeated structures geometries such as repeated arrays of fuel pins; (d) including metastable isotopes in burnup; and (e) manually changing the concentrations of any isotope during any time step by specified atom fraction, weight fraction, atom density, or gram density. These enhancements allow better detail to model the true system physics as well as to improve the robustness of the capability.
H. B. Robinson benchmark calculations were completed to assess the validity of nuclide predictability of MCNPX 2.6.0. The results show comparisons of key actinide and fission products as compared to experiment and the SCALE-4 SAS2H sequence 27-group cross-section library (27BURNUPLIB) results. MCNPX 2.6.0 depletion results are within 4% of the experimental results for most major actinides.
Two major depletion enhancements are available in the MCNPX 2.7.A beta release: improved 63-group flux querying and parallelization of the burnup interface routines in multiprocessor mode. Fixing the energy group querying routine does correctly tally the energy flux for use with isotopes not containing transport cross sections; however, results show <1% change in nuclide prediction for the benchmark test case. MCNPX 2.7.A parallelizes the depletion interface routines and running of CINDER90 so that different burnable regions of a given depletion system can be preprocessed, burned, and postprocessed on separate slave processors. The parallelization involves minimal communication between processors anti therefore leads to significant computational performance enhancement.
The combination of new enhancements and testing of the MCNPX 2.6.0 depletion computational system make this capability a valuable Monte Carlo-linked depletion tool. Additional testing and feature enhancements are under development to further improve the usefulness of the computational tool.
C1 [Fensin, Michael L.; Hendricks, John S.] Los Alamos Natl Lab, MCNPX Code Dev Grp D 5, Los Alamos, NM 87545 USA.
[Fensin, Michael L.; Anghaie, Samim] Univ Florida, Dept Nucl & Radiol Engn, Gainesville, FL 32611 USA.
RP Fensin, ML (reprint author), Los Alamos Natl Lab, MCNPX Code Dev Grp D 5, N-4,X-3,MS E540, Los Alamos, NM 87545 USA.
EM mfensin@lanl.gov
FU U.S. Department of Energy; Office of Nuclear Energy; Global Nuclear
Energy Partnership Program
FX This work was supported by the U.S. Department of Energy, Office of
Nuclear Energy, Global Nuclear Energy Partnership Program. The authors
acknowledge G. McKinney, M. Miller, P. Santi, and S. Tobin from LANL for
their guidance and suggestions in the methodology development of the
capability enhancements. The authors also thank T. Marcille from LANL
and B. Ade from Purdue University for their help in generating the
ENDF/B VIL.0 cross sections used in the H. B. Robinson benchmark
calculations. The authors further acknowledge H. Trellue, S. Holloway,
and W. B. Wilson from LANL and G. Zimmerman for their support in the
development of CINDER90. Finally, the authors thank C. Whitmer from
Whitmer Consulting, LLC, for identifying the bug regarding the energy
structure for the 63-group flux calculation.
NR 36
TC 20
Z9 20
U1 0
U2 5
PU AMER NUCLEAR SOC
PI LA GRANGE PK
PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA
SN 0029-5450
EI 1943-7471
J9 NUCL TECHNOL
JI Nucl. Technol.
PD APR
PY 2010
VL 170
IS 1
BP 68
EP 79
PG 12
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 573OW
UT WOS:000275924900007
ER
PT J
AU Triplett, BS
Anghaie, S
White, MC
AF Triplett, Brian S.
Anghaie, Samim
White, Morgan C.
TI DEVELOPMENT OF AN AUTOMATED TESTING SYSTEM FOR VERIFICATION AND
VALIDATION OF NUCLEAR DATA AND SIMULATION CODE
SO NUCLEAR TECHNOLOGY
LA English
DT Article; Proceedings Paper
CT International Congress on Advances in Nuclear Power Plants (ICAPP)
CY JUN 08-12, 2008
CL Anaheim, CA
DE verification and validation; automation; nuclear data
ID ENDF/B-VII.0
AB Verification and validation (V&V) of nuclear data are critical to the accuracy of both stochastic and deterministic particle transport codes. To effectively test a set of nuclear data, the data must be applied to a wide variety of transport problems. Performing this task in a timely, efficient manner is tedious. The nuclear data team at Los Alamos National Laboratory in collaboration with the University of Florida has developed a methodology to automate the process of nuclear data V&V This automated V&V process can efficiently test a number of data libraries using well-defined benchmark experiments, such as those in the International Criticality Safety Benchmark Experiment Project. The process is implemented through an integrated set of Python scripts. Material and geometry data are read from an existing medium or given directly by the user to generate a benchmark experiment template file. The user specifies the choice of benchmark, templates, codes, and libraries to form a V&V project. The Python scripts automatically generate input decks for multiple transport codes, run and monitor individual jobs, and parse the relevant output. The output can then be used to generate reports directly or can be stored in a database for later analysis. This methodology eases the burden on the user by reducing the amount of time and effort required for obtaining and compiling calculation results. The resource savings by using this automated methodology could potentially be an enabling technology for more sophisticated data studies, such as nuclear data uncertainty quantification. Once deployed, this tool will allow the nuclear data community to more thoroughly test data libraries leading to higher-fidelity data in the future.
C1 [Triplett, Brian S.; Anghaie, Samim] Univ Florida, Gainesville, FL 32611 USA.
[White, Morgan C.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Triplett, BS (reprint author), Univ Florida, POB 116502, Gainesville, FL 32611 USA.
EM triplett@ufl.edu
FU nuclear data team at LANL
FX The authors would like to thank the nuclear data team at LANL for their
support and funding of this project. Aside from the listed authors,
other individuals who made a significant contribution include K.
Triplett, A. Herring, D. Coombs, D. Pimental, R. Little, C. Sommer, and
J. Hopkins.
NR 10
TC 0
Z9 0
U1 0
U2 2
PU AMER NUCLEAR SOC
PI LA GRANGE PK
PA 555 N KENSINGTON AVE, LA GRANGE PK, IL 60526 USA
SN 0029-5450
EI 1943-7471
J9 NUCL TECHNOL
JI Nucl. Technol.
PD APR
PY 2010
VL 170
IS 1
BP 80
EP 89
PG 10
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 573OW
UT WOS:000275924900008
ER
PT J
AU Alexandrov, BS
Gelev, V
Yoo, SW
Alexandrov, LB
Fukuyo, Y
Bishop, AR
Rasmussen, KO
Usheva, A
AF Alexandrov, Boian S.
Gelev, Vladimir
Yoo, Sang Wook
Alexandrov, Ludmil B.
Fukuyo, Yayoi
Bishop, Alan R.
Rasmussen, Kim O.
Usheva, Anny
TI DNA dynamics play a role as a basal transcription factor in the
positioning and regulation of gene transcription initiation
SO NUCLEIC ACIDS RESEARCH
LA English
DT Article
ID RNA-POLYMERASE-II; THYMIDYLATE SYNTHASE PROMOTER; CORE PROMOTER;
BINDING; MODEL; DENATURATION; STACKING; ELEMENT; YY1
AB We assess the role of DNA breathing dynamics as a determinant of promoter strength and transcription start site (TSS) location. We compare DNA Langevin dynamic profiles of representative gene promoters, calculated with the extended non-linear PBD model of DNA with experimental data on transcription factor binding and transcriptional activity. Our results demonstrate that DNA dynamic activity at the TSS can be suppressed by mutations that do not affect basal transcription factor binding-DNA contacts. We use this effect to establish the separate contributions of transcription factor binding and DNA dynamics to transcriptional activity. Our results argue against a purely 'transcription factor-centric' view of transcription initiation, suggesting that both DNA dynamics and transcription factor binding are necessary conditions for transcription initiation.
C1 [Gelev, Vladimir; Yoo, Sang Wook; Alexandrov, Ludmil B.; Fukuyo, Yayoi; Usheva, Anny] Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Boston, MA 02215 USA.
[Alexandrov, Boian S.; Bishop, Alan R.; Rasmussen, Kim O.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM USA.
[Alexandrov, Boian S.; Bishop, Alan R.; Rasmussen, Kim O.] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA.
RP Usheva, A (reprint author), Harvard Univ, Beth Israel Deaconess Med Ctr, Sch Med, Boston, MA 02215 USA.
EM ausheva@bidmc.harvard.edu
RI Rasmussen, Kim/B-5464-2009; Alexandrov, Boian/D-2488-2010; Alexandrov,
Ludmil/B-6582-2014
OI Rasmussen, Kim/0000-0002-4029-4723; Alexandrov,
Boian/0000-0001-8636-4603; Alexandrov, Ludmil/0000-0003-3596-4515
FU National Institutes of Health [GM073911]; US Department of Energy at Los
Alamos National Laboratory [DE-AC52-06NA25396]
FX National Institutes of Health (GM073911 to A. U.); National Nuclear
Security Administration of the US Department of Energy at Los Alamos
National Laboratory (Contract DE-AC52-06NA25396). Funding for open
access charge: DE-AC52-06NA25396.
NR 29
TC 28
Z9 28
U1 0
U2 10
PU OXFORD UNIV PRESS
PI OXFORD
PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
SN 0305-1048
J9 NUCLEIC ACIDS RES
JI Nucleic Acids Res.
PD APR
PY 2010
VL 38
IS 6
BP 1790
EP 1795
DI 10.1093/nar/gkp1084
PG 6
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 578PB
UT WOS:000276304600012
PM 20019064
ER
PT J
AU Mulligan, EA
Hatchwell, E
McCorkle, SR
Dunn, JJ
AF Mulligan, Elizabeth A.
Hatchwell, Eli
McCorkle, Sean R.
Dunn, John J.
TI Differential binding of Escherichia coli McrA protein to DNA sequences
that contain the dinucleotide m5CpG
SO NUCLEIC ACIDS RESEARCH
LA English
DT Article
ID CPG BINDING; METHYLATED DNA; CYTOSINE METHYLATION; MAMMALIAN DNA; SRA
DOMAIN; RESTRICTION; ISLANDS; K-12; 5-HYDROXYMETHYLCYTOSINE;
5-METHYLCYTOSINE
AB The Escherichia coli McrA protein, a putative C(5)-methylcytosine/C(5)-hydroxyl methylcytosine-specific nuclease, binds DNA with symmetrically methylated HpaII sequences (Cm5CGG), but its precise recognition sequence remains undefined. To determine McrA's binding specificity, we cloned and expressed recombinant McrA with a C-terminal StrepII tag (rMcrA-S) to facilitate protein purification and affinity capture of human DNA fragments with m5C residues. Sequence analysis of a subset of these fragments and electrophoretic mobility shift assays with model methylated and unmethylated oligonucleotides suggest that N(Y > R) m5CGR is the canonical binding site for rMcrA-S. In addition to binding HpaII-methylated double-stranded DNA, rMcrA-S binds DNA containing a single, hemimethylated HpaII site; however, it does not bind if A, C, T or U is placed across from the m5C residue, but does if I is opposite the m5C. These results provide the first systematic analysis of McrA's in vitro binding specificity.
C1 [McCorkle, Sean R.; Dunn, John J.] Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA.
[Mulligan, Elizabeth A.] SUNY Stony Brook, Dept Mol Genet & Microbiol, Stony Brook, NY 11794 USA.
[Hatchwell, Eli] SUNY Stony Brook, Genom Core Facil, Stony Brook, NY 11794 USA.
RP Dunn, JJ (reprint author), Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA.
EM jdunn@bnl.gov
FU Laboratory Directed Research and Development Award at Brookhaven
National Laboratory; Low Dose Radiation Research Program of the Office
of Biological and Environmental Research program of the US Department of
Energy; National Institutes of Health [U01-AI56480]; U. S. Department of
Energy and National Institutes of Health [U01-AI56480]
FX Laboratory Directed Research and Development Award at Brookhaven
National Laboratory; the Low Dose Radiation Research Program of the
Office of Biological and Environmental Research program of the US
Department of Energy; and by the National Institutes of Health (grant
U01-AI56480 to J. J. D.). Funding for open access charge: Office of
Biological and Environmental Research program of the U. S. Department of
Energy and National Institutes of Health (grant U01-AI56480 to J. J.
D.).
NR 38
TC 6
Z9 6
U1 0
U2 1
PU OXFORD UNIV PRESS
PI OXFORD
PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
SN 0305-1048
J9 NUCLEIC ACIDS RES
JI Nucleic Acids Res.
PD APR
PY 2010
VL 38
IS 6
BP 1997
EP 2005
DI 10.1093/nar/gkp1120
PG 9
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 578PB
UT WOS:000276304600029
PM 20015968
ER
PT J
AU Falgout, RD
AF Falgout, Robert D.
TI Multigrid methods
SO NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS
LA English
DT Editorial Material
DE multigrid; algebraic multigrid
AB This special issue contains papers from the Fourteenth Copper Mountain Conference on Multigrid Methods, held in the Colorado Rocky Mountains on March 22-27, 2009. The papers address a variety of applications and cover a breadth of topics, ranging from theory to high-performance computing. Copyright (C) 2010 John Wiley & Sons, Ltd.
C1 Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94550 USA.
RP Falgout, RD (reprint author), Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94550 USA.
EM rfalgout@llnl.gov
NR 21
TC 0
Z9 0
U1 0
U2 2
PU JOHN WILEY & SONS LTD
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND
SN 1070-5325
J9 NUMER LINEAR ALGEBR
JI Numer. Linear Algebr. Appl.
PD APR
PY 2010
VL 17
IS 2-3
SI SI
BP 175
EP 178
DI 10.1002/nla.712
PG 4
WC Mathematics, Applied; Mathematics
SC Mathematics
GA 581VK
UT WOS:000276552800001
ER
PT J
AU Yang, UM
AF Yang, Ulrike Meier
TI On long-range interpolation operators for aggressive coarsening
SO NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS
LA English
DT Article
DE algebraic muligrid; long-range interpolation; aggressive coarsening;
parallel computing
ID ELLIPTIC PROBLEMS
AB Algebraic multigrid (AMG) is a very efficient scalable preconditioner for solving sparse linear systems on unstructured grids. Currently, AMG solvers with good numerical scalability can still have larger than desired complexities, whereas variants with very low complexities exhibit decreased numerical scalability, which presents a problem for future high-performance computers with millions of cores and decreased memory per core. It is therefore necessary to design more sophisticated interpolation operators to improve numerical scalability while preserving low memory usage. Two new long-range interpolation operators to be used in combination with aggressive coarsening are presented. Their convergence and performance are examined and compared with multipass interpolation, the interpolation currently most commonly used with aggressive coarsening, and a higher complexity AMG variant. While the new interpolation operators require a more complex setup, leading to larger setup times, they exhibit better convergence than multipass interpolation, often resulting in better solve times. Copyright (C) 2009 John Wiley & Sons, Ltd.
C1 Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA.
RP Yang, UM (reprint author), Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Box 808,L-560, Livermore, CA 94551 USA.
EM umyang@llnl.gov
NR 13
TC 8
Z9 8
U1 0
U2 1
PU JOHN WILEY & SONS LTD
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND
SN 1070-5325
J9 NUMER LINEAR ALGEBR
JI Numer. Linear Algebr. Appl.
PD APR
PY 2010
VL 17
IS 2-3
SI SI
BP 453
EP 472
DI 10.1002/nla.689
PG 20
WC Mathematics, Applied; Mathematics
SC Mathematics
GA 581VK
UT WOS:000276552800016
ER
PT J
AU Baker, AH
Kolev, TV
Yang, UM
AF Baker, A. H.
Kolev, Tz. V.
Yang, U. M.
TI Improving algebraic multigrid interpolation operators for linear
elasticity problems
SO NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS
LA English
DT Article
DE algebraic multigrid; linear elasticity; rigid body mode interpolation
ID AMG
AB Linear systems arising from discretizations of systems of partial differential equations can be challenging for algebraic multigrid (AMG), as the design of AMG relies on assumptions based on the near-nullspace properties of scalar diffusion problems. For elasticity applications, the near-nullspace of the operator includes the so-called rigid body modes (RBMs), which are not adequately represented by the classical AMG interpolation operators. In this paper we investigate several approaches for improving AMG convergence on linear elasticity problems by explicitly incorporating the near-nullspace modes in the range of the interpolation. In particular, we propose two new methods for extending any initial AMG interpolation operator to exactly fit the RBMs based on the introduction of additional coarse degrees of freedom at each node. Though the methodology is general and can be used to fit any set of near-nullspace vectors, we focus on the RBMs of linear elasticity in this paper. The new methods can be incorporated easily into existing AMG codes, do not require matrix inversions, and do not assume an aggregation approach or a finite element framework. We demonstrate the effectiveness of the new interpolation operators on several 2D and 3D elasticity problems. Copyright (C) 2009 John Wiley & Sons, Ltd.
C1 [Baker, A. H.; Kolev, Tz. V.; Yang, U. M.] Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA.
RP Baker, AH (reprint author), Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Box 808 L-560, Livermore, CA 94551 USA.
EM abaker@llnl.gov
FU U.S. Department of Energy [DE-AC52-07NA27344 (LLNL-JRNL-412928)]
FX Contract/grant sponsor: U.S. Department of Energy; contract/grant
number: DE-AC52-07NA27344 (LLNL-JRNL-412928)
NR 25
TC 12
Z9 12
U1 1
U2 2
PU JOHN WILEY & SONS LTD
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND
SN 1070-5325
J9 NUMER LINEAR ALGEBR
JI Numer. Linear Algebr. Appl.
PD APR
PY 2010
VL 17
IS 2-3
SI SI
BP 495
EP 517
DI 10.1002/nla.688
PG 23
WC Mathematics, Applied; Mathematics
SC Mathematics
GA 581VK
UT WOS:000276552800018
ER
PT J
AU Dendy, JE
Moulton, JD
AF Dendy, J. E., Jr.
Moulton, J. D.
TI Black Box Multigrid with coarsening by a factor of three
SO NUMERICAL LINEAR ALGEBRA WITH APPLICATIONS
LA English
DT Article
DE multigrid; algebraic multigrid; variational coarsening
ID PARTIAL-DIFFERENTIAL-EQUATIONS; SMOOTHED AGGREGATION; ELLIPTIC PROBLEMS;
COEFFICIENTS; CONVERGENCE; MESHES
AB Black Box Multigrid (BoxMG) is a robust variational multigrid solver for diffusion equations on logically structured grids. BoxMG standardly uses coarsening by a factor of two. It handles cell-centered discretizations on logically rectangular grids by treating the cell-centers as the unknowns to be coarsened. Such a strategy does not preserve the cell structure. That is, coarse-grid cells are not the union of fine-grid cells. In some applications, such as local grid refinement, it is desirable that the cell structure be preserved. In this paper, we develop a method that employs coarsening by a factor of three. It is a natural generalization of standard BoxMG, using operator-induced interpolation (which approximately preserves the continuity of the normal flux), restriction as the transpose of interpolation, and Galerkin coarsening. In addition, we introduce a new colored block Gauss Seidel scheme that is motivated by the form of the interpolation operator, dubbed 'pattern' relaxation. We present numerical results that demonstrate robustness of this method with respect to discontinuous diffusion coefficients, boundary conditions, and grid dimension. Published in 2010 by John Wiley & Sons, Ltd.
C1 [Moulton, J. D.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
RP Moulton, JD (reprint author), Los Alamos Natl Lab, Div Theoret, MS-B284, Los Alamos, NM 87545 USA.
EM moulton@lanl.gov
FU U.S. Department of Energy [DE-AC52-06NA25396]; DOE Office of Science
Advanced Computing Research (ASCR)
FX Contract grant/sponsor: U.S. Department of Energy; contract
grant/number: DE-AC52-06NA25396; This work was funded by the Department
of Energy at Los Alamos National Laboratory under contracts
DE-AC52-06NA25396 and the DOE Office of Science Advanced Computing
Research (ASCR) program in Applied Mathematical Sciences. The authors
thank the referees for their constructive comments that improved this
paper.
NR 26
TC 9
Z9 9
U1 0
U2 2
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 1070-5325
EI 1099-1506
J9 NUMER LINEAR ALGEBR
JI Numer. Linear Algebr. Appl.
PD APR
PY 2010
VL 17
IS 2-3
SI SI
BP 577
EP 598
DI 10.1002/nla.705
PG 22
WC Mathematics, Applied; Mathematics
SC Mathematics
GA 581VK
UT WOS:000276552800022
ER
PT J
AU Creanga, AA
Johnson, TF
Graitcer, SB
Hartman, LK
Al-Samarrai, T
Schwarz, AG
Chu, SY
Sackoff, JE
Jamieson, DJ
Fine, AD
Shapiro-Mendoza, CK
Jones, LE
Uyeki, TM
Balter, S
Bish, CL
Finelli, L
Honein, MA
AF Creanga, Andreea A.
Johnson, Tamisha F.
Graitcer, Samuel B.
Hartman, Laura K.
Al-Samarrai, Teeb
Schwarz, Aviva G.
Chu, Susan Y.
Sackoff, Judith E.
Jamieson, Denise J.
Fine, Anne D.
Shapiro-Mendoza, Carrie K.
Jones, Lucretia E.
Uyeki, Timothy M.
Balter, Sharon
Bish, Connie L.
Finelli, Lyn
Honein, Margaret A.
TI Severity of 2009 Pandemic Influenza A (H1N1) Virus Infection in Pregnant
Women
SO OBSTETRICS AND GYNECOLOGY
LA English
DT Article
ID IMMUNIZATION PRACTICES ACIP; CRITICALLY-ILL PATIENTS; EMERGING
INFECTIONS; ADVISORY-COMMITTEE; A(H1N1); RECOMMENDATIONS; PREVENTION;
HUMANS; IMPACT
AB OBJECTIVE: To examine 2009 H1N1 influenza illness severity and the effect of antiviral treatment on the severity of illness among pregnant women.
METHODS: We abstracted medical records from hospitalized pregnant (n = 62) and nonpregnant (n = 74) women with laboratory-confirmed 2009 H1N1 influenza in New York City, May through June 2009. We compared characteristics of pregnant and nonpregnant women and of severe and moderate influenza illness among pregnant women, with severe defined as illness resulting in intensive care admission or death.
RESULTS: The 2009 H1N1 hospitalization rate was significantly higher among pregnant than nonpregnant women (55.3 compared with 7.7 per 100,000 population). Eight pregnant (including two deaths) and 16 nonpregnant (including four deaths) cases were severe. Pregnant women represented 6.4% of hospitalized cases and 4.3% of deaths caused by 2009 H1N1 influenza. Only 1 in 30 (3.3%) pregnant women who received oseltamivir treatment within 2 days of symptom onset had severe illness compared with 3 of 14 (21.4%) and four of nine (44.4%) pregnant women who started treatment 3-4 days and 5 days or more after symptom onset, respectively (P = .002 for trend). Severe and moderate 2009 H1N1 influenza illness occurred in all pregnancy trimesters, but most women (54.8%) were in the third trimester. Twenty-two women delivered during their influenza hospitalization, and severe neonatal outcomes (neonatal intensive care unit admission or death) occurred among five of six (83.3%) women with severe illness compared with 2 of 16 (12.5%) women with moderate illness (P = .004).
CONCLUSION: Our findings highlight the potential for severe illness and adverse neonatal outcomes among pregnant 2009 H1N1 influenza-infected women and suggest the benefit of early oseltamivir treatment. (Obstet Gynecol 2010; 115: 717-26)
C1 [Creanga, Andreea A.] Natl Ctr Chron Dis Prevent & Hlth Promot, Div Reprod Hlth, Atlanta, GA 30341 USA.
New York City Dept Hlth & Mental Hyg, New York, NY USA.
Oak Ridge Inst Sci & Educ, Oak Ridge, TN USA.
RP Creanga, AA (reprint author), Natl Ctr Chron Dis Prevent & Hlth Promot, Div Reprod Hlth, 4770 Buford Highway NE,Mail Stop K-23, Atlanta, GA 30341 USA.
EM acreanga@cdc.gov
NR 24
TC 143
Z9 152
U1 0
U2 4
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0029-7844
J9 OBSTET GYNECOL
JI Obstet. Gynecol.
PD APR
PY 2010
VL 115
IS 4
BP 717
EP 726
DI 10.1097/AOG.0b013e3181d57947
PG 10
WC Obstetrics & Gynecology
SC Obstetrics & Gynecology
GA 580QH
UT WOS:000276463700007
PM 20308830
ER
PT J
AU Winne, CT
Willson, JD
Gibbons, JW
AF Winne, Christopher T.
Willson, John D.
Gibbons, J. Whitfield
TI Drought survival and reproduction impose contrasting selection pressures
on maximum body size and sexual size dimorphism in a snake, Seminatrix
pygaea
SO OECOLOGIA
LA English
DT Article
DE Cost of reproduction; Natural selection; Prey abundance; Sexual
selection; Tradeoffs
ID FREE-RANGING PYTHONS; EVAPORATIVE WATER-LOSS; EUROPEAN GRASS SNAKES;
MALE MATING SUCCESS; BLACK SWAMP SNAKE; NERODIA-SIPEDON; MARINE IGUANAS;
NORTHERN WATERSNAKES; POPULATION-STRUCTURE; ISOLATED WETLAND
AB The causes and consequences of body size and sexual size dimorphism (SSD) have been central questions in evolutionary ecology. Two, often opposing selective forces are suspected to act on body size in animals: survival selection and reproductive (fecundity and sexual) selection. We have recently identified a system where a small aquatic snake species (Seminatrix pygaea) is capable of surviving severe droughts by aestivating within dried, isolated wetlands. We tested the hypothesis that the lack of aquatic prey during severe droughts would impose significant survivorship pressures on S. pygaea, and that the largest individuals, particularly females, would be most adversely affected by resource limitation. Our findings suggest that both sexes experience selection against large body size during severe drought when prey resources are limited, as nearly all S. pygaea are absent from the largest size classes and maximum body size and SSD are dramatically reduced following drought. Conversely, strong positive correlations between maternal body size and reproductive success in S. pygaea suggest that females experience fecundity selection for large size during non-drought years. Collectively, our study emphasizes the dynamic interplay between selection pressures that act on body size and supports theoretical predictions about the relationship between body size and survivorship in ectotherms under conditions of resource limitation.
C1 [Winne, Christopher T.; Willson, John D.; Gibbons, J. Whitfield] Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA.
RP Winne, CT (reprint author), 8901 Verona Trail, Austin, TX 78749 USA.
EM ctwinne@gmail.com
FU University of Georgia Animal Care and Use Committee [A2003-10024]; South
Carolina Department of Natural Resources [56-2003]; US Department of
Energy [DE-FC09-07SR22506]
FX We thank Luke Fedewa for field assistance. Richard Seigel and Ray
Loraine graciously provided population data from the 1980s. Brian Todd
provided insightful comments on earlier versions of this manuscript. All
procedures used in the study were approved by the University of Georgia
Animal Care and Use Committee (no. A2003-10024) and by the South
Carolina Department of Natural Resources (collection permits no.
56-2003). This research was supported in part by the US Department of
Energy through Financial Assistance Award no. DE-FC09-07SR22506 to the
University of Georgia Research Foundation. This study complies with the
current laws of the United States of America.
NR 68
TC 8
Z9 9
U1 8
U2 22
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0029-8549
EI 1432-1939
J9 OECOLOGIA
JI Oecologia
PD APR
PY 2010
VL 162
IS 4
BP 913
EP 922
DI 10.1007/s00442-009-1513-8
PG 10
WC Ecology
SC Environmental Sciences & Ecology
GA 571KB
UT WOS:000275749600010
PM 19967417
ER
PT J
AU Langland, GT
Yannone, SM
Langland, RA
Nakao, A
Guan, YH
Long, SBT
Vonguyen, L
Chen, DJ
Gray, JW
Chen, FQ
AF Langland, Gregory T.
Yannone, Steven M.
Langland, Rachel A.
Nakao, Aki
Guan, Yinghui
Long, Sydney B. T.
Vonguyen, Lien
Chen, David J.
Gray, Joe W.
Chen, Fanqing
TI Radiosensitivity profiles from a panel of ovarian cancer cell lines
exhibiting genetic alterations in p53 and disparate DNA-dependent
protein kinase activities
SO ONCOLOGY REPORTS
LA English
DT Article
DE ovarian cancer; non-homologous end joining; p53; p21; DNA-PK; DNA-PKcs;
Ku; Ku70; Ku80; XRCC4; Ligase IV; radioresistance; radiosensitivity;
apoptosis; double-strand break repair; microarray; comparative genomic
hybridization
ID EXPRESSION; THERAPY; CARCINOMA; RADIATION; NECK; HEAD
AB The variability of radiation responses in ovarian tumors and tumor-derived cell lines is poorly understood. Since both DNA repair capacity and p53 Status call significantly alter radiation sensitivity, we evaluated these factors along with radiation sensitivity in a panel of sporadic human ovarian carcinoma cell lines. We observed a gradation of radiation sensitivity among these sixteen lines, with a five-fold difference in the LD(50) between the most radiosensitive and the most radioresistant cells. The DNA-dependent protein kinase (DNA-PK) is essential for the repair of radiation induced DNA double-strand breaks in human somatic cells. Therefore, we measured gene copy number, expression levels, protein abundance, genomic Copy and kinase activity for DNA-PK in all Of Our cell lines. While there were detectable differences in DNA-PK between the cell lines, there was no clear correlation with any of these differences and radiation sensitivity. In contrast, p53 function as determined by two independent methods, correlated well with radiation sensitivity, indicating p53 Mutant ovarian cancer cells are typically radioresistant relative to p53 wild-type lines. These data suggest that the activity of regulatory molecules Such as p53 may be better indicators of radiation sensitivity than DNA repair enzymes such as DNA-PK in ovarian cancer.
C1 [Langland, Gregory T.; Yannone, Steven M.; Guan, Yinghui; Long, Sydney B. T.; Vonguyen, Lien; Gray, Joe W.; Chen, Fanqing] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA.
[Gray, Joe W.; Chen, Fanqing] Univ Calif San Francisco, Dept Lab Med, San Francisco, CA 94143 USA.
[Gray, Joe W.; Chen, Fanqing] Univ Calif San Francisco, Ctr Comprehens Canc, San Francisco, CA 94143 USA.
[Langland, Rachel A.; Nakao, Aki] Roche Mol Syst, Dept Pharmacogenet, Pleasanton, CA 94588 USA.
[Chen, David J.] Univ Texas SW Med Ctr Dallas, Dept Radiat Oncol, Dallas, TX 75390 USA.
RP Langland, GT (reprint author), Del Mar Coll, Dept Nat Sci, 101 Baldwin Blvd,GS 244, Corpus Christi, TX 78404 USA.
EM glangland@delmar.edu
RI Yannone, Steven/G-1927-2011
FU NIH [IF32GM071229-01, CA 112970]; National Natural Science Foundation of
China [NSFC-30828010, R1CA95393-01]; Zhejiang California Nanosystem
Institute; DOD Breast Cancer Research Program [BC061995]; DOD [BCRP
BC045345]; UCSF; University of California/Lawrence Berkeley National
Laboratory [DE-AC03-76SF00098]
FX We Would like to thank Ms. Nancy Patten and Sim Truong for their expert
technical assistance. This work was supported by NIH IF32GM071229-01
awarded to G. Langland and the National Natural Science Foundation of
China, NSFC-30828010, the Zhejiang California Nanosystem Institute, DOD
Breast Cancer Research Program Grant BC061995, NIH Grant R1CA95393-01,
DOD BCRP BC045345 grant, UCSF Prostate Cancer SPORE award and NIH P50
Grant CA 112970 awarded to either J.W. Gray or F. Chen. This work was
performed under the auspices of the U.S. Department of Energy, at the
University of California/Lawrence Berkeley National Laboratory under
contract no. DE-AC03-76SF00098.
NR 21
TC 6
Z9 9
U1 0
U2 1
PU SPANDIDOS PUBL LTD
PI ATHENS
PA POB 18179, ATHENS, 116 10, GREECE
SN 1021-335X
J9 ONCOL REP
JI Oncol. Rep.
PD APR
PY 2010
VL 23
IS 4
BP 1021
EP 1026
DI 10.3892/or_00000728
PG 6
WC Oncology
SC Oncology
GA 572BS
UT WOS:000275802000018
PM 20204287
ER
PT J
AU Lee, AWM
Williams, BS
Kumar, S
Hu, Q
Reno, JL
AF Lee, Alan Wei Min
Williams, Benjamin S.
Kumar, Sushil
Hu, Qing
Reno, John L.
TI Tunable terahertz quantum cascade lasers with external gratings
SO OPTICS LETTERS
LA English
DT Article
ID METAL WAVE-GUIDES; HIGH-POWER
AB We demonstrate a frequency tunable external cavity terahertz quantum cascade laser using an abutted antireflection-coated silicon lens to reduce facet reflection and as a beam-forming element, with an external grating providing frequency selective optical feedback. Angle tuning of the grating allows a single longitudinal mode of the laser ridge to be selected, resulting in discontinuous tuning over a 165 GHz range around a center frequency of 4.4 THz. Another device exhibited 145 GHz of total tuning with 9 GHz of continuous tuning near the longitudinal modes of the laser. (C) 2010 Optical Society of America
C1 [Lee, Alan Wei Min; Kumar, Sushil; Hu, Qing] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA.
[Lee, Alan Wei Min; Kumar, Sushil; Hu, Qing] MIT, Elect Res Lab, Cambridge, MA 02139 USA.
[Reno, John L.] Sandia Natl Labs, CINT, Dept 1132, Albuquerque, NM 87185 USA.
RP Lee, AWM (reprint author), MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA.
EM awmlee@mit.edu
RI Williams, Benjamin/B-4494-2013
OI Williams, Benjamin/0000-0002-6241-8336
FU Air Force Office of Scientific Research; National Aeronautics and Space
Administration (NASA); National Science Foundation (NSF); United States
Department of Energy [DE-AC04-94AL85000]
FX This work is supported by the Air Force Office of Scientific Research,
National Aeronautics and Space Administration (NASA), and National
Science Foundation (NSF). Sandia is a multiprogram laboratory operated
by Sandia Corporation, a Lockheed Martin Company, for the United States
Department of Energy's National Nuclear Security Administration under
contract DE-AC04-94AL85000.
NR 13
TC 34
Z9 34
U1 3
U2 9
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 0146-9592
J9 OPT LETT
JI Opt. Lett.
PD APR 1
PY 2010
VL 35
IS 7
BP 910
EP 912
PG 3
WC Optics
SC Optics
GA 578QP
UT WOS:000276309300006
PM 20364166
ER
PT J
AU Schutze, M
Tortorelli, PF
Wright, IG
AF Schuetze, M.
Tortorelli, P. F.
Wright, I. G.
TI Development of a Comprehensive Oxide Scale Failure Diagram
SO OXIDATION OF METALS
LA English
DT Article
DE Mechanical failure; Oxide scales; Fracture; Spalling; Delamination; Iron
oxides; Critical strain
ID MECHANICAL-PROPERTIES; GROWTH TEMPERATURE; 2.25CR-1MO STEEL; OXIDATION;
NICKEL; 900-DEGREES-C; BEHAVIOR; CRACKING; ALLOY
AB This paper describes a new approach towards the development of a comprehensive oxide scale failure diagram (OSFD) that delineates the mechanical limits of scales for the different types of failure mechanisms. While former diagrams of a similar type were based on relating the critical strain to scale failure to oxide scale thickness, the new approach replaces scale thickness with a comprehensive operational parameter omega(o) that summarizes in a multi-level treatment all contributing factors, e.g. physical defect size, interface roughness, scale thickness, Young's modulus, fracture toughness, etc., that influence failure strain. While this approach should ideally be based on a comprehensive treatment of omega(o) using fully implemented coding, further considerations based on the identification of "low-impact" and "high-impact" parameters lead to a simplified OSFD where only the physical defect size is needed. This simplified approach can be used to assess the strain tolerance of oxide scales in industrial operation once the particular diagram has been established from laboratory data.
C1 [Schuetze, M.] DECHEMA eV, Karl Winnacker Inst, D-60061 Frankfurt, Germany.
[Tortorelli, P. F.; Wright, I. G.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Schutze, M (reprint author), DECHEMA eV, Karl Winnacker Inst, D-60061 Frankfurt, Germany.
EM schuetze@dechema.de
RI Tortorelli, Peter/E-2433-2011
FU EPRI, Palo Alto [1013666]
FX The work was financially supported by EPRI, Palo Alto, in the Program on
Technology Innovation: Oxide Growth and Exfoliation on Alloys Exposed to
Steam as part of project no. 1013666 which is gratefully acknowledged.
NR 39
TC 22
Z9 22
U1 4
U2 18
PU SPRINGER/PLENUM PUBLISHERS
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0030-770X
J9 OXID MET
JI Oxid. Met.
PD APR
PY 2010
VL 73
IS 3-4
BP 389
EP 418
DI 10.1007/s11085-009-9185-7
PG 30
WC Metallurgy & Metallurgical Engineering
SC Metallurgy & Metallurgical Engineering
GA 561BQ
UT WOS:000274950700003
ER
PT J
AU Bedewi, A
El Anany, G
El Mofty, M
Kretlow, A
Park, S
Miller, LM
AF El Bedewi, Ahmed
El Anany, Galal
El Mofty, Medhat
Kretlow, Ariane
Park, Simone
Miller, Lisa M.
TI The use of synchrotron infrared microspectroscopy in the assessment of
cutaneous T-cell lymphoma vs. pityriasis lichenoides chronica
SO PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE
LA English
DT Article
DE infrared microspectroscopy; mycosis fungoides; pityriasis lichenoides
chronica; synchrotron and nucleic acids
ID MYCOSIS-FUNGOIDES; SPECTROSCOPY
AB Background
The diagnosis of cutaneous lymphomas remains a challenge for both the clinician and dermatopathologist.
Objectives
To differentiate between frank malignant and premalignant lymphocytes within the skin.
Methods
This study was performed on 20 patients with a mean age of 50 years. They were divided into two groups: mycosis fungoides (MF) (stage IA, IB and IIA) and pityriasis lichenoides chronica (PLC). Immunophenotyping using antibodies CD3, CD4, CD8, CD20 and CD30 was performed. Synchrotron Fourier transform infrared microspectroscopy (S-FTIRM) was performed on cell nuclei to assess chemical differences between MF and PLC cases as a potential complementary screening tool. Dermal spectra of both MF and PLC were compared using principal components analysis (PCA) of the S-FTIRM data.
Results
All PLC spectra was clustered together. However, the MF spectra formed two clusters, one that grouped with the PLC and the other grouped separately. Moreover, protein and nucleic acids showed highly significant differences between MF (IIA and IB), MF (IA) and PLC.
Conclusions
The malignant transformation within lymphocytes was identifiable through the spectroscopic analysis of protein, RNA and DNA with S-FTIRM, making it a promising tool for classifying the progression of cutaneous T-cell lymphoma.
C1 [El Bedewi, Ahmed] NRRCT Dermatol, Cairo 11211, Egypt.
[El Bedewi, Ahmed; Kretlow, Ariane; Park, Simone; Miller, Lisa M.] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA.
[El Anany, Galal; El Mofty, Medhat] Cairo Univ, Dept Dermatol, Fac Med, Cairo, Egypt.
RP Bedewi, A (reprint author), NRRCT Dermatol, 4 Hishmat St, Cairo 11211, Egypt.
EM aelbedewi@gmail.com
FU DOE Cooperative Research Program; United States Department of Energy,
Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
FX This work was funded in part by the DOE Cooperative Research Program to
SESAME. The NSLS is supported by the United States Department of Energy,
Office of Science, Office of Basic Energy Sciences, under contract
DE-AC02-98CH10886.
NR 15
TC 2
Z9 2
U1 0
U2 2
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0905-4383
J9 PHOTODERMATOL PHOTO
JI Photodermatol. Photoimmunol. Photomed.
PD APR
PY 2010
VL 26
IS 2
BP 93
EP 97
PG 5
WC Dermatology
SC Dermatology
GA 570BS
UT WOS:000275647200007
ER
PT J
AU Yang, L
Zu, XT
Gao, F
Peng, SM
Heinisch, HL
Long, XG
Kurtz, RJ
AF Yang, L.
Zu, X. T.
Gao, F.
Peng, S. M.
Heinisch, H. L.
Long, X. G.
Kurtz, R. J.
TI Dynamic interactions of helium-vacancy clusters with edge dislocations
in alpha-Fe
SO PHYSICA B-CONDENSED MATTER
LA English
DT Article
DE Molecular dynamic; Edge dislocation; He-vacancy cluster; alpha-Fe
ID DISPLACEMENT CASCADES; IRON; METALS; HE
AB The effects of He-vacancy (He-V) clusters on the mobility of an a/2 < 111 > {110} edge dislocation in alpha-Fe are investigated by atomic simulation with empirical potentials at 0 K. A number of small He(n)V(m) (n/m 0-4) clusters initially placed at the same position on the slip plane are comparatively studied. The results show that the interaction of He-V clusters with edge dislocations depends on not only the helium-to-vacancy (He/V) ratio, but also the cluster size. The small He-V clusters with low He/V ratios have a small effect on the dislocation mobility, but the larger clusters with higher He/V ratios significantly increase the critical resolved shear stress for dislocation glide. One of interesting results is that the He-V clusters almost stay at their original positions, and do not move along with the dislocation. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Yang, L.; Zu, X. T.] Univ Elect Sci & Technol China, Dept Appl Phys, Chengdu 610054, Peoples R China.
[Gao, F.; Heinisch, H. L.; Kurtz, R. J.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Peng, S. M.; Long, X. G.] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Peoples R China.
RP Yang, L (reprint author), Univ Elect Sci & Technol China, Dept Appl Phys, Chengdu 610054, Peoples R China.
EM yanglilkd@yahoo.com.cn
RI Gao, Fei/H-3045-2012
FU National Natural Science Foundation of China-NSAF [10976007]; US
Department of Energy, Office of Fusion Energy Science [DE-AC06-76RLO
1830]
FX L. Yang and X.T. Zu are grateful for the support by National Natural
Science Foundation of China-NSAF (Grant No: 10976007). F. Gao, H.L.
Heinisch and Rj. Kurtz are grateful for the support by the US Department
of Energy, Office of Fusion Energy Science, under Contract DE-AC06-76RLO
1830.
NR 17
TC 7
Z9 7
U1 0
U2 15
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0921-4526
J9 PHYSICA B
JI Physica B
PD APR 1
PY 2010
VL 405
IS 7
BP 1754
EP 1758
DI 10.1016/j.physb.2010.01.034
PG 5
WC Physics, Condensed Matter
SC Physics
GA 570TF
UT WOS:000275700200017
ER
PT J
AU Choi, YY
Hong, J
Hong, S
Song, H
Cheong, DS
No, K
AF Choi, Yoon-Young
Hong, Jongin
Hong, Seungbum
Song, Hanwook
Cheong, Deok-Soo
No, Kwangsoo
TI Nanoscale piezoresponse of 70 nm poly(vinylidene
fluoride-trifluoro-ethylene) films annealed at different temperatures
SO PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
LA English
DT Article
DE atomic force microscopy; dielectrics; thin films; polymers
ID FLUORIDE TRIFLUOROETHYLENE COPOLYMER; FIELD-EFFECT TRANSISTOR;
THIN-FILMS; VINYLIDENE FLUORIDE; CRYSTALLINE; POLYMER; DEPENDENCE;
MEMORY
AB In order to characterize the piezoelectric properties of 70 nm thick poly(vinylidene fluoride-trifluoroethylene), P(VDF-TrFE), films grown by a spin-coating technique, both nanoscale manipulation and polarization switching were studied using piezoresponse force Microscopy (PFM). We varied the annealing, temperature from 75 degrees C to 145 degrees C and achieved a high-quality 70 nm P(VDF-TrFE) film annealed at the temperature of 95 degrees C. Ferroelecrtic domains and their properties were confirmed using X-ray diffraction, grazing incidence reflection absorption Fourier, Transform Infrared (GIRA-FTIR) and PFM analysis. The ferroelectric domains in the film were homogeneously switchable below 5 V with a remnant d(33) of 14.9 pm/V. This offers out rationale for a promise in energy harvesting and switchability would be good for plastic electronics. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
C1 [Hong, Jongin] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England.
[Choi, Yoon-Young; No, Kwangsoo] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea.
[Hong, Seungbum] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Song, Hanwook] Korea Res Inst Stand & Sci, Grp Stand & Basis Metrol, Taejon 305340, South Korea.
[Cheong, Deok-Soo] Dankook Univ, Dept Mat Sci & Engn, Cheonan, Chungnam, South Korea.
RP Hong, J (reprint author), Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England.
EM hong.jongin@gmail.com; ksno@kaist.ac.kr
RI No, Kwangsoo/G-4891-2010; No, Kwangsoo/C-1983-2011; Hong,
Jongin/B-4504-2009; Hong, Seungbum/B-7708-2009
OI Hong, Jongin/0000-0002-2891-5785; Hong, Seungbum/0000-0002-2667-1983
FU MEST in Korea; KOSEF [R01-2007-000-10953-0]; NRF in Korea
[2009-0082289]; EEWS Research Project of the office of KAIST EEWS
Initiative [EEWS-2009-1090048]; Argonne National Laboratory
[DE-AC02-06CH11357]
FX This work was supported by the MEST in Korea (project 'Brain Korea 21'),
the KOSEF grant (No. R01-2007-000-10953-0), the Converging Research
Center Program through the NRF in Korea (2009-0082289) and EEWS Research
Project of the office of KAIST EEWS Initiative (No. EEWS-2009-1090048).
SH acknowledges financial support by Argonne National Laboratory
(Contract No. DE-AC02-06CH11357).
NR 23
TC 18
Z9 18
U1 4
U2 30
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1862-6254
J9 PHYS STATUS SOLIDI-R
JI Phys. Status Solidi-Rapid Res. Lett.
PD APR
PY 2010
VL 4
IS 3-4
BP 94
EP 96
DI 10.1002/pssr.201004009
PG 3
WC Materials Science, Multidisciplinary; Physics, Applied; Physics,
Condensed Matter
SC Materials Science; Physics
GA 590JP
UT WOS:000277222000021
ER
PT J
AU Leefer, N
Cingoz, A
Gerber-Siff, B
Sharma, A
Torgerson, JR
Budker, D
AF Leefer, N.
Cingoez, A.
Gerber-Siff, B.
Sharma, Arijit
Torgerson, J. R.
Budker, D.
TI Transverse laser cooling of a thermal atomic beam of dysprosium
SO PHYSICAL REVIEW A
LA English
DT Article
ID HYPERFINE-STRUCTURE; STATES; NM
AB A thermal atomic beam of dysprosium atoms is cooled using the 4f(10)6s(2)(J = 8) -> 4f(10)6s6p(J = 9) transition at 421 nm. The cooling is done via a standing light wave orthogonal to the atomic beam. Efficient transverse cooling to the Doppler limit is demonstrated for all observable isotopes of dysprosium. Branching ratios to metastable states are demonstrated to be < 5 x 10(-4). A scheme for enhancement of the nonzero-nuclear-spin-isotope cooling and a method for direct identification of possible trap states are proposed.
C1 [Leefer, N.; Cingoez, A.; Budker, D.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Gerber-Siff, B.] Swarthmore Coll, Swarthmore, PA 19081 USA.
[Sharma, Arijit] Raman Res Inst, Bangalore 560080, Karnataka, India.
[Torgerson, J. R.] Los Alamos Natl Lab, Div Phys, Los Alamos, NM 87545 USA.
[Budker, D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
RP Leefer, N (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM naleefer@berkeley.edu; budker@berkeley.edu
RI SHARMA, ARIJIT/L-4614-2016; Budker, Dmitry/F-7580-2016
OI SHARMA, ARIJIT/0000-0002-2143-0574; Leefer, Nathan/0000-0002-4940-8432;
Budker, Dmitry/0000-0002-7356-4814
FU Foundational Questions Institute; UC Berkeley Committee on Research;
NSF/DST [PHY-0425916]
FX The authors acknowledge the contributions of V. Flambaum and V. Dzuba
for the theoretical calculations of branching ratios and H. Muller for
comments on the manuscript. We thank A. Skliar of Raicol Crystals Ltd.
for extensive technical advice regarding the PPKTP crystal. This work
has been supported by the Foundational Questions Institute (fqxi.org),
the UC Berkeley Committee on Research, and NSF/DST Grant No. PHY-0425916
for US-India cooperative research.
NR 31
TC 14
Z9 15
U1 0
U2 2
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1050-2947
J9 PHYS REV A
JI Phys. Rev. A
PD APR
PY 2010
VL 81
IS 4
AR 043427
DI 10.1103/PhysRevA.81.043427
PG 6
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 590LJ
UT WOS:000277227300143
ER
PT J
AU Marti, GE
Olf, R
Vogt, E
Ottl, A
Stamper-Kurn, DM
AF Marti, G. Edward
Olf, Ryan
Vogt, Enrico
Oettl, Anton
Stamper-Kurn, Dan M.
TI Two-element Zeeman slower for rubidium and lithium
SO PHYSICAL REVIEW A
LA English
DT Article
ID ATOMIC-BEAM; TRAP; GAS
AB We demonstrate a two-element oven and Zeeman slower that produce simultaneous and overlapped slow beams of rubidium and lithium. The slower uses a three-stage design with a long, low-acceleration middle stage for decelerating rubidium situated between two short, high-acceleration stages for aggressive deceleration of lithium. This design is appropriate for producing high fluxes of atoms with a large mass ratio in a simple, robust setup.
C1 [Marti, G. Edward; Olf, Ryan; Vogt, Enrico; Oettl, Anton; Stamper-Kurn, Dan M.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Stamper-Kurn, Dan M.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Marti, GE (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
RI Stamper-Kurn, Dan/B-5442-2015
OI Stamper-Kurn, Dan/0000-0002-4845-5835
FU Defense Advanced Research Project Agency [49467-PHDRP]; Defense Threat
Reduction Agency [HDTRA1-09-1-0020]; Hertz Foundation; Bundesministerium
fur Bildung und Forschung; Deutsche Forschungsgemeinschaft; Miller
Institute for Basic Research in Science
FX We thank P.J. Daniels, J. Guzman, and X. Wu for assistance in the early
stages of this work. This work was supported by the Defense Advanced
Research Project Agency (Grant No. 49467-PHDRP) and the Defense Threat
Reduction Agency (Contract No. HDTRA1-09-1-0020). GEM acknowledges
support from the Hertz Foundation, EV from Bundesministerium fur Bildung
und Forschung, AO from Deutsche Forschungsgemeinschaft, and DMSK from
the Miller Institute for Basic Research in Science.
NR 42
TC 5
Z9 5
U1 1
U2 8
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1050-2947
J9 PHYS REV A
JI Phys. Rev. A
PD APR
PY 2010
VL 81
IS 4
AR 043424
DI 10.1103/PhysRevA.81.043424
PG 6
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 590LJ
UT WOS:000277227300140
ER
PT J
AU Pabst, S
Ho, PJ
Santra, R
AF Pabst, Stefan
Ho, Phay J.
Santra, Robin
TI Computational studies of x-ray scattering from
three-dimensionally-aligned asymmetric-top molecules
SO PHYSICAL REVIEW A
LA English
DT Article
ID INTENSE LASER FIELDS; DIFFRACTION MICROSCOPY; PHASE RETRIEVAL;
NONADIABATIC ALIGNMENT; MANIPULATING MOLECULES; NONPERIODIC OBJECTS;
ALIGNING MOLECULES; WAVE-PACKETS; CRYSTALLOGRAPHY; RECONSTRUCTION
AB We theoretically and numerically analyze x-ray scattering from asymmetric-top molecules three-dimensionally aligned using elliptically polarized laser light. A rigid-rotor model is assumed. The principal axes of the polarizability tensor are assumed to coincide with the principal axes of the moment of inertia tensor. Several symmetries in the Hamiltonian are identified and exploited to enhance the efficiency of solving the time-dependent Schrodinger equation for each rotational state initially populated in a thermal ensemble. Using a phase-retrieval algorithm, the feasibility of structure reconstruction from a quasiadiabatically aligned sample is illustrated for the organic molecule naphthalene. The spatial resolution achievable strongly depends on the laser parameters, the initial rotational temperature, and the x-ray pulse duration. We demonstrate that for a laser peak intensity of 5 TW/cm(2), a laser pulse duration of 100 ps, a rotational temperature of 10 mK, and an x-ray pulse duration of 1 ps, the molecular structure may be probed at a resolution of 1 angstrom.
C1 [Pabst, Stefan; Ho, Phay J.; Santra, Robin] Argonne Natl Lab, Argonne, IL 60439 USA.
[Pabst, Stefan] Univ Erlangen Nurnberg, Inst Theoret Phys, D-91058 Erlangen, Germany.
[Santra, Robin] Univ Chicago, Dept Phys, Chicago, IL 60637 USA.
RP Santra, R (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA.
RI Pabst, Stefan/J-6541-2013; Santra, Robin/E-8332-2014
OI Pabst, Stefan/0000-0003-1134-4629; Santra, Robin/0000-0002-1442-9815
FU Office of Basic Energy Sciences, US Department of Energy
[DE-AC02-06CH11357]
FX We thank Cassandra Hunt for helpful comments on the manuscript. This
work was supported by the Office of Basic Energy Sciences, US Department
of Energy under Contract No. DE-AC02-06CH11357.
NR 120
TC 21
Z9 21
U1 0
U2 6
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2469-9926
EI 2469-9934
J9 PHYS REV A
JI Phys. Rev. A
PD APR
PY 2010
VL 81
IS 4
AR 043425
DI 10.1103/PhysRevA.81.043425
PG 16
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 590LJ
UT WOS:000277227300141
ER
PT J
AU Sakhel, AR
Dubois, JL
Sakhel, RR
AF Sakhel, Asaad R.
Dubois, Jonathan L.
Sakhel, Roger R.
TI Tunneling of a few strongly repulsive hard-sphere bosons in an optical
lattice with tight external harmonic confinement: A quantum Monte Carlo
investigation in continuous space
SO PHYSICAL REVIEW A
LA English
DT Article
ID ULTRACOLD ATOMS; MOTT-INSULATOR; SUPERFLUID; TRANSITION; DYNAMICS
AB The effect of strongly repulsive interactions on the tunneling amplitude of hard-sphere (HS) bosons confined in a simple cubic optical lattice plus tight external harmonic confinement in continuous space is investigated. The quantum variational Monte Carlo (VMC) and the variational path integral (VPI) Monte Carlo techniques are used at zero temperature. The effects of the lattice spacing on the tunneling amplitude are also considered. The occupancies of the lattice sites as a function of the repulsion between the bosons are further revealed. Our chief result is that for a small number of bosons (N = 8) the overlap of the wave functions in neighboring wells practically does not change with an increase of the repulsive interactions and changes only minimally for a larger number of particles (N = 40). The tunneling amplitude rises with a reduction in the lattice spacing. In addition, the occupancy of the center of the trap decreases in favor of a rise in the occupancy of the lattice sites at the edges of the trap with increasing HS repulsion. Further, it was found that the energy per particle at certain optical-lattice barrier heights is insensitive to the number of particles and variations in the HS diameter of the bosons. In order to support our results, we compare the VMC results with corresponding VPI results.
C1 [Sakhel, Asaad R.] Al Balqa Appl Univ, Fac Engn Technol, Dept Basic Sci, Amman 11134, Jordan.
[Dubois, Jonathan L.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
[Sakhel, Roger R.] Al Isra Univ, Dept Basic Sci, Fac Sci & Informat Technol, Amman 11622, Jordan.
RP Sakhel, AR (reprint author), Al Balqa Appl Univ, Fac Engn Technol, Dept Basic Sci, Amman 11134, Jordan.
OI Sakhel, Asaad/0000-0002-8999-0615; DuBois, Jonathan/0000-0003-3154-4273
NR 53
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U1 0
U2 4
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2469-9926
EI 2469-9934
J9 PHYS REV A
JI Phys. Rev. A
PD APR
PY 2010
VL 81
IS 4
AR 043603
DI 10.1103/PhysRevA.81.043603
PG 17
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 590LJ
UT WOS:000277227300148
ER
PT J
AU Semenov, SK
Schoffler, MS
Titze, J
Petridis, N
Jahnke, T
Cole, K
Schmidt, LPH
Czasch, A
Akoury, D
Jagutzki, O
Williams, JB
Osipov, T
Lee, S
Prior, MH
Belkacem, A
Landers, AL
Schmidt-Bocking, H
Weber, T
Cherepkov, NA
Dorner, R
AF Semenov, S. K.
Schoeffler, M. S.
Titze, J.
Petridis, N.
Jahnke, T.
Cole, K.
Schmidt, L. Ph H.
Czasch, A.
Akoury, D.
Jagutzki, O.
Williams, J. B.
Osipov, T.
Lee, S.
Prior, M. H.
Belkacem, A.
Landers, A. L.
Schmidt-Boecking, H.
Weber, Th
Cherepkov, N. A.
Doerner, R.
TI Auger decay of 1 sigma(g) and 1 sigma(u) hole states of the N-2
molecule: Disentangling decay routes from coincidence measurements
SO PHYSICAL REVIEW A
LA English
DT Article
ID 2-STEP DOUBLE PHOTOIONIZATION; VIBRATIONALLY RESOLVED PHOTOIONIZATION;
COMPLETE FRAGMENTATION-PATTERN; K-SHELL PHOTOIONIZATION;
ANGULAR-DISTRIBUTIONS; MOMENTUM SPECTROSCOPY; DIATOMIC-MOLECULES;
RECOIL-ION; ELECTRON; PHOTOELECTRON
AB Results of the most sophisticated measurements in coincidence with the angular-resolved K-shell photoelectrons and Auger electrons and with two atomic ions produced by dissociation of N-2 molecule are analyzed. Detection of photoelectrons at certain angles makes it possible to separate the Auger decay processes of the 1 sigma g and 1 sigma(u) core-hole states. The Auger electron angular distributions for each of these hole states are measured as a function of the kinetic-energy release of two atomic ions and are compared with the corresponding theoretical angular distributions. From that comparison one can disentangle the contributions of different repulsive doubly charged molecular ion states to the Auger decay. Different kinetic-energy-release values are directly related to the different internuclear distances. In this way one can trace experimentally the behavior of the potential energy curves of dicationic final states inside the Frank-Condon region. Presentation of the Auger-electron angular distributions as a function of kinetic-energy release of two atomic ions opens a new dimension in the study of Auger decay.
C1 [Semenov, S. K.; Cherepkov, N. A.] State Univ Aerosp Instrumentat, St Petersburg 190000, Russia.
[Schoeffler, M. S.; Titze, J.; Petridis, N.; Jahnke, T.; Cole, K.; Schmidt, L. Ph H.; Czasch, A.; Akoury, D.; Jagutzki, O.; Schmidt-Boecking, H.; Cherepkov, N. A.; Doerner, R.] Goethe Univ Frankfurt, Inst Kernphys, D-60438 Frankfurt, Germany.
[Akoury, D.; Osipov, T.; Lee, S.; Prior, M. H.; Belkacem, A.; Weber, Th] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Williams, J. B.; Landers, A. L.] Auburn Univ, Dept Phys, Auburn, AL 36849 USA.
RP Semenov, SK (reprint author), State Univ Aerosp Instrumentat, St Petersburg 190000, Russia.
RI Doerner, Reinhard/A-5340-2008; Landers, Allen/C-1213-2013; Weber,
Thorsten/K-2586-2013; Schoeffler, Markus/B-6261-2008
OI Doerner, Reinhard/0000-0002-3728-4268; Weber,
Thorsten/0000-0003-3756-2704; Schoeffler, Markus/0000-0001-9214-6848
FU Deutsche Forschungsgemeinschaft; office of Basic Energy Sciences,
Division of Chemical Sciences of the US Department of Energy
[DE-AC03-76SF00098, DE-FG02-07ER46357]; RFBR [09-03-00781-a]
FX We acknowledge outstanding support by the staff of the Advanced Lights
Source, in particular by Hendrik Bluhm and Tolek Tyliszczak. The work
was supported by the Deutsche Forschungsgemeinschaft and by the office
of Basic Energy Sciences, Division of Chemical Sciences of the US
Department of Energy, under Contract Nos. DE-AC03-76SF00098 and
DE-FG02-07ER46357. N.A.C. acknowledges the financial support of Deutsche
Forschungsgemeinschaft through a Mercator professorship. S.K.S. and
N.A.C. acknowledge the hospitality of Goethe University in Frankfurt am
Main and the financial support of RFBR (Grant No. 09-03-00781-a).
NR 41
TC 11
Z9 11
U1 1
U2 8
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1050-2947
J9 PHYS REV A
JI Phys. Rev. A
PD APR
PY 2010
VL 81
IS 4
AR 043426
DI 10.1103/PhysRevA.81.043426
PG 10
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 590LJ
UT WOS:000277227300142
ER
PT J
AU Ticknor, C
AF Ticknor, Christopher
TI Quasi-two-dimensional dipolar scattering
SO PHYSICAL REVIEW A
LA English
DT Article
ID MOLECULES; ATOMS; GAS
AB We study two-body dipolar scattering with one dimension of confinement. We include the effects of confinement by expanding this degree of freedom in harmonic oscillator states. We then study the properties of the resulting multichannel system. We study the adiabatic curves as a function of D/l, the ratio of the dipolar and confinement length scales. There is no dipolar barrier for this system when D/l < 0.34. We also study the WKB tunneling probability as a function of D/l and scattering energy. This can be used to estimate the character of the scattering.
C1 [Ticknor, Christopher] Harvard Smithsonian Ctr Astrophys, ITAMP, Cambridge, MA 02138 USA.
[Ticknor, Christopher] Swinburne Univ Technol, ARC Ctr Excellence Quantum Atom Opt, Hawthorn, Vic 3122, Australia.
[Ticknor, Christopher] Swinburne Univ Technol, Ctr Atom Opt & Ultrafast Spect, Hawthorn, Vic 3122, Australia.
RP Ticknor, C (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
RI Ticknor, Christopher/B-8651-2014
FU Australian Research Council; NSF; Smithsonian Astrophysical Observatory
FX The author thanks S. Rittenhouse, S. Ronen, and E. Kuznetsova for
discussions and gratefully acknowledges support from the Australian
Research Council and partial support from NSF through ITAMP at Harvard
University and the Smithsonian Astrophysical Observatory.
NR 33
TC 25
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U1 1
U2 3
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1050-2947
J9 PHYS REV A
JI Phys. Rev. A
PD APR
PY 2010
VL 81
IS 4
AR 042708
DI 10.1103/PhysRevA.81.042708
PG 6
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 590LJ
UT WOS:000277227300103
ER
PT J
AU Arman, B
Luo, SN
Germann, TC
Cagin, T
AF Arman, Bedri
Luo, Sheng-Nian
Germann, Timothy C.
Cagin, Tahir
TI Dynamic response of Cu46Zr54 metallic glass to high-strain-rate shock
loading: Plasticity, spall, and atomic-level structures
SO PHYSICAL REVIEW B
LA English
DT Article
ID MOLECULAR-DYNAMICS; MECHANICAL-BEHAVIOR; AMORPHOUS-ALLOYS;
SINGLE-CRYSTAL; WAVE RESPONSE; SIMULATIONS; STRENGTH; COMPRESSION;
FAILURE; PACKING
AB We investigate dynamic response of Cu46Zr54 metallic glass under adiabatic planar shock wave loading (one-dimensional strain) with molecular dynamics simulations, including Hugoniot (shock) states, shock-induced plasticity, and spallation. The Hugoniot states are obtained up to 60 GPa along with the von Mises shear flow strengths, and the dynamic spall strengths, at different strain rates and temperatures. The spall strengths likely represent the limiting values achievable in experiments such as laser ablation. For the steady shock states, a clear elastic-plastic transition is identified (e.g., in the shock velocity-particle velocity curve), and the shear strength shows strain softening. However, the elastic-plastic transition across the shock front displays transient stress overshoot (hardening) above the Hugoniot elastic limit followed by a relatively sluggish relaxation to the steady shock state, and the plastic shock front steepens with increasing shock strength. The local von Mises shear strain analysis is used to characterize local deformation, and the Voronoi tessellation analysis, the corresponding local structures at various stages of shock, release, tension and spallation. The plasticity in this glass, manifested as localized shear transformation zones, is of local structure rather than thermal origin, and void nucleation occurs preferentially at the highly shear-deformed regions. The Voronoi and shear strain analyses show that the atoms with different local structures are of different shear resistances that lead to shear localization (e.g., the atoms indexed with < 0,0,12,0 > are most shear-resistant, and those with < 0,2,8,1 > are highly prone to shear flow). The dynamic changes in local structures are consistent with the observed deformation dynamics.
C1 [Arman, Bedri; Luo, Sheng-Nian; Germann, Timothy C.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Arman, Bedri; Cagin, Tahir] Texas A&M Univ, Dept Chem Engn, College Stn, TX 77845 USA.
RP Arman, B (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM sluo@lanl.gov; Tahir.Cagin@chemail.tamu.edu
RI Luo, Sheng-Nian /D-2257-2010;
OI Luo, Sheng-Nian /0000-0002-7538-0541; Germann,
Timothy/0000-0002-6813-238X
FU Laboratory Directed Research Development programs at LANL; LLC
[DE-AC52-06NA25396]
FX We have benefited from discussion with S. Valone. This work has been
supported by the Laboratory Directed Research Development programs at
LANL. LANL is operated by Los Alamos National Security, LLC for the U.S.
Department of Energy under Contract No. DE-AC52-06NA25396.
NR 70
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U1 3
U2 51
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2469-9950
EI 2469-9969
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144201
DI 10.1103/PhysRevB.81.144201
PG 12
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200059
ER
PT J
AU Baek, SH
Graf, MJ
Balatsky, AV
Bauer, ED
Cooley, C
Smith, JL
Curro, NJ
AF Baek, S. -H.
Graf, M. J.
Balatsky, A. V.
Bauer, E. D.
Cooley, C.
Smith, J. L.
Curro, N. J.
TI Antiferromagnetic patches and hidden order in URu2Si2 by impurity doping
SO PHYSICAL REVIEW B
LA English
DT Article
ID SUPERCONDUCTOR URU2SI2; NEUTRON-SCATTERING; MAGNETIC ORDER; SPIN;
EXCITATIONS; FIELD
AB We report the use of impurities to probe the hidden order parameter of the strongly correlated metal URu2Si2 below the transition temperature T-0 similar to 17.5 K. The nature of this order parameter has eluded researchers for more than two decades but is accompanied by the development of a partial gap in the single-particle density of states that can be detected through measurements of the electronic specific heat and nuclear-spin-lattice relaxation rate. We find that impurities in the hidden order phase give rise to local patches of antiferromagnetism. An analysis of the coupling between the antiferromagnetism and the hidden order reveals that the former is not a competing order parameter but rather a parasitic effect of the latter.
C1 [Baek, S. -H.; Graf, M. J.; Balatsky, A. V.; Bauer, E. D.; Cooley, C.; Smith, J. L.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Curro, N. J.] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA.
RP Baek, SH (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
RI Bauer, Eric/D-7212-2011; Baek, Seung-Ho/F-4733-2011; Curro,
Nicholas/D-3413-2009;
OI Baek, Seung-Ho/0000-0002-0059-8255; Curro, Nicholas/0000-0001-7829-0237;
Bauer, Eric/0000-0003-0017-1937
FU U.S. DOE [DE-AC52-06NA25396]
FX We thank J.D. Thompson, J.A. Mydosh, P. Oppeneer, P. Coleman, and J.C
Davis for stimulating discussions. Work at Los Alamos National
Laboratory was performed under the auspices of the U.S. DOE under
Contract No. DE-AC52-06NA25396.
NR 24
TC 13
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U1 0
U2 4
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2469-9950
EI 2469-9969
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 132404
DI 10.1103/PhysRevB.81.132404
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900012
ER
PT J
AU Berkowitz, AE
Hong, JI
McCall, SK
Shipton, E
Chan, KT
Leo, T
Smith, DJ
AF Berkowitz, A. E.
Hong, J. -I.
McCall, S. K.
Shipton, E.
Chan, K. T.
Leo, T.
Smith, D. J.
TI Refining the exchange anisotropy paradigm: Magnetic and microstructural
heterogeneity at the Permalloy-CoO interface
SO PHYSICAL REVIEW B
LA English
DT Article
ID BIAS; MECHANISMS; VISCOSITY; FILMS; MODEL
AB More than 50 years of extensive research into exchange anisotropy in ferromagnetic-antiferromagnetic bilayers has not produced a convincing explanation for any given system of its principal manifestations, namely, a shift of the hysteresis loop along the field axis (exchange bias) and enhanced coercivity. We have examined this issue in the prototypical polycrystalline Permalloy-CoO bilayer system with samples whose Permalloy thicknesses ranged from 1 to 25 nm. The heterogeneous magnetic and chemical microstructure of the similar to 1-nm-thick interfacial region is responsible for the observed exchange bias and coercivity, and for their dependence on Permalloy thickness and on temperature. Approximately 75% of the interfacial moment is produced by magnetically hard particles which are exchange coupled to the CoO and are responsible for exchange bias and coercivity by virtue of their exchange coupling to the Permalloy. The remainder of the interfacial moment is produced by a magnetically soft phase that exhibits no exchange bias. The thickness dependence of the exchange bias agrees with the prediction of a random-field model in which the exchange coupling of the distributed hard particles provides a random field operating on the Permalloy. The coercivity is determined by the switching of the hard interfacial particles coupled to the Permalloy; it has a remarkably linear temperature dependence which can be explained by a simple thermal fluctuation model. The exchange bias exhibits the same temperature dependence as the CoO uncompensated spins and these uncompensated spins are on the interfacial {111} planes of the [111]-textured CoO. Finally, the kinetics of the chemical reactions responsible for the interfacial heterogeneity can contribute to the latent period during which the exchange bias can be substantially reversed by applying a field antiparallel to the cooling field.
C1 [Berkowitz, A. E.; Shipton, E.] Univ Calif San Diego, Dept Phys, Ctr Magnet Recording Res, La Jolla, CA 92093 USA.
[Hong, J. -I.] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.
[McCall, S. K.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
[Leo, T.; Smith, D. J.] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA.
RP Berkowitz, AE (reprint author), Univ Calif San Diego, Dept Phys, Ctr Magnet Recording Res, La Jolla, CA 92093 USA.
EM aberk@ucsd.edu
RI HONG, JUNG-IL/B-8566-2008; McCall, Scott/G-1733-2014
OI HONG, JUNG-IL/0000-0001-7301-6693; McCall, Scott/0000-0002-7979-4944
FU U. S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA2734]
FX We appreciate useful discussions with F. E. Spada and E. E. Fullerton.
Work performed at LLNL was under the auspices of the U. S. Department of
Energy by Lawrence Livermore National Laboratory under Contract No.
DE-AC52-07NA2734. We acknowledge the use of facilities at the John M.
Cowley Center for High Resolution Electron Microscopy at Arizona State
University.
NR 33
TC 17
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U1 3
U2 18
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134404
DI 10.1103/PhysRevB.81.134404
PG 9
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900039
ER
PT J
AU Bernstein, N
Feldman, JL
Singh, DJ
AF Bernstein, N.
Feldman, J. L.
Singh, D. J.
TI Calculations of dynamical properties of skutterudites: Thermal
conductivity, thermal expansivity, and atomic mean-square displacement
SO PHYSICAL REVIEW B
LA English
DT Article
ID LATTICE-DYNAMICS; FILLED SKUTTERUDITES; THERMOELECTRIC-MATERIALS;
REFLECTION SPECTRA; MOLECULAR-DYNAMICS; LOW-TEMPERATURES; MODEL; COSB3;
ANTIMONIDES; CRYSTALS
AB While the thermal conductivity of the filled skutterudites has been of great interest it had not been calculated within a microscopic theory. Here a central force, Guggenheim-McGlashen, model with parameters largely extracted from first-principles calculations and from spectroscopic data, specific to LaFe(4)Sb(12) or CoSb(3), is employed in a Green-Kubo/molecular dynamics calculation of thermal conductivity as a function of temperature. We find that the thermal conductivity of a filled solid is more than a factor of two lower than that of an unfilled solid, assuming the "framework" interatomic force parameters are the same between filled and unfilled solids, and that this decrease is almost entirely due to the cubic anharmonic interaction between filling and framework atoms. In addition, partially as a test of our models, we calculate thermal expansivity and isotropic atomic mean-square displacements using both molecular dynamics and lattice dynamics methods. These quantities are in reasonable agreement with experiment, increasing our confidence in the anharmonic parameters of our models. We also find an anomalously large filling-atom mode Gruneisen parameter that is apparently observed for a filled skutterudite and is observed in a clathrate.
C1 [Bernstein, N.; Feldman, J. L.] USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA.
[Feldman, J. L.] George Mason Univ, Fairfax, VA 22030 USA.
[Singh, D. J.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
RP Bernstein, N (reprint author), USN, Res Lab, Ctr Computat Mat Sci, Washington, DC 20375 USA.
RI Singh, David/I-2416-2012
FU DOE; EERE Vehicle Technologies Propulsion Materials Program; S3TEC EFRC;
ONR; NRL
FX Work at ORNL was supported by DOE, EERE Vehicle Technologies Propulsion
Materials Program and the S3TEC EFRC. Work at NRL was supported by ONR
and NRL. J. L. F. is grateful to R. Vienois for valuable communication,
and to colleagues at the Geophysical Laboratory, Carnegie Institution of
Washington, especially R. E. Cohen and R. J. Hemley for stimulating
discussions. D. J. S. thanks A. Henry for helpful discussions.
NR 64
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U2 31
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134301
DI 10.1103/PhysRevB.81.134301
PG 11
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900031
ER
PT J
AU Chen, B
Gleason, AE
Yan, JY
Koski, KJ
Clark, S
Jeanloz, R
AF Chen, Bin
Gleason, A. E.
Yan, J. Y.
Koski, K. J.
Clark, Simon
Jeanloz, Raymond
TI Elasticity, strength, and refractive index of argon at high pressures
SO PHYSICAL REVIEW B
LA English
DT Article
ID SOLID ARGON; BRILLOUIN-SCATTERING; SINGLE-CRYSTAL; GPA; CALIBRATION;
GAUGE; NACL; CELL
AB High-pressure Brillouin spectroscopy of polycrystalline argon, measured using two scattering angles (180 degrees and 70 degrees), determines the isotropic elastic moduli, shear strength, equation of state, and refractive index of face-centered-cubic argon from 1.3 to 30 GPa at room temperature. The index of refraction n= 1.33-1.67 over this pressure range. An Eulerian finite-strain analysis (Birch-Murnaghan equation of state) yields an isothermal bulk modulus and pressure derivative K(T)= 15.1(+/- 1.1) GPa and K(T)' = 5.4(+/- 0.3) at 2 GPa. The resulting equation of state agrees well with previous x-ray diffraction measurements, illustrating the suitability of high-pressure Brillouin scattering for characterizing the elasticity and strength of polycrystalline materials.
C1 [Chen, Bin; Yan, J. Y.; Clark, Simon] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA.
[Koski, K. J.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
RP Chen, B (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA.
EM bchen@lbl.gov
FU Consortium for Materials Properties Research in Earth Sciences
(COMPRES); National Science Foundation; Department of Energy
[DE-AC02-05CH11231]
FX Financial support for this work was provided by the Consortium for
Materials Properties Research in Earth Sciences (COMPRES), the National
Science Foundation and Department of Energy, including funding for A. E.
Gleason (Carnegie/DOE Alliance Center for High Pressure Science and
Technology) and support for the Advanced Light Source (DOE under
Contract No. DE-AC02-05CH11231). The diamond cells used in our study
were constructed by G. Rose (Princeton University). We are grateful for
assistance from T. Duffy, F. Jiang, and Z. Mao (Princeton University),
S. Speziale (German Research Centre for Geosciences, Potsdam), and J.
Knight (Lawrence Berkeley National Laboratory). We thank Selva Raju for
helpful discussions and H. Shimizu for prereview reading.
NR 27
TC 10
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U1 1
U2 16
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144110
DI 10.1103/PhysRevB.81.144110
PG 5
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200040
ER
PT J
AU Clem, JR
AF Clem, John R.
TI Josephson junctions in thin and narrow rectangular superconducting
strips
SO PHYSICAL REVIEW B
LA English
DT Article
ID NONLOCAL INTERACTION
AB I consider a Josephson junction crossing the middle of a thin rectangular superconducting strip of length L and width W subjected to a perpendicular magnetic induction B. I calculate the spatial dependence of the gauge-invariant phase difference across the junction and the resulting B dependence of the critical current I(c)(B).
C1 [Clem, John R.] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
[Clem, John R.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
RP Clem, JR (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
FU Department of Energy-Basic Energy Sciences [DE-AC02-07CH11358]
FX I thank J. E. Sadleir and V. G. Kogan for stimulating discussions. My
work at the Ames Laboratory was supported by the Department of
Energy-Basic Energy Sciences under Contract No. DE-AC02-07CH11358.
NR 19
TC 5
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U1 0
U2 4
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144515
DI 10.1103/PhysRevB.81.144515
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200111
ER
PT J
AU Del Genio, CI
Bassler, KE
Korzhenevskii, AL
Barabash, RI
Trenkler, J
Reiter, GF
Moss, SC
AF Del Genio, Charo I.
Bassler, Kevin E.
Korzhenevskii, Aleksandr L.
Barabash, Rozaliya I.
Trenkler, Johann
Reiter, George F.
Moss, Simon C.
TI Depth-dependent ordering, two-length-scale phenomena, and crossover
behavior in a crystal featuring a skin layer with defects
SO PHYSICAL REVIEW B
LA English
DT Article
ID 2 LENGTH SCALES; X-RAY-SCATTERING; CRITICAL FLUCTUATIONS;
NEUTRON-SCATTERING; PHASE-TRANSITIONS; SRTIO3; ORIGIN; V2H; HOLMIUM
AB Structural defects in a crystal are responsible for the "two-length-scale" behavior in which a sharp central peak is superimposed over a broad peak in critical diffuse x-ray scattering. We have previously measured the scaling behavior of the central peak by scattering from a near-surface region of a V(2)H crystal, which has a first-order transition in the bulk. As the temperature is lowered toward the critical temperature, a crossover in critical behavior is seen, with the temperature range nearest to the critical point being characterized by mean-field exponents. Near the transition, a small two-phase coexistence region is observed. The values of transition and crossover temperatures decay with depth. An explanation of these experimental results is here proposed by means of a theory in which edge dislocations in the near-surface region occur in walls oriented in the two directions normal to the surface. The strain caused by the dislocation lines causes the ordering in the crystal to occur as growth of roughly cylindrically shaped regions. After the regions have reached a certain size, the crossover in the critical behavior occurs, and mean-field behavior prevails. At a still lower temperature, the rest of the material between the cylindrical regions orders via a weak first-order transition.
C1 [Del Genio, Charo I.; Bassler, Kevin E.; Reiter, George F.; Moss, Simon C.] Univ Houston, Dept Phys, Houston, TX 77204 USA.
[Del Genio, Charo I.; Bassler, Kevin E.; Moss, Simon C.] Univ Houston, Texas Ctr Superconduct, Houston, TX 77204 USA.
[Korzhenevskii, Aleksandr L.] Inst Problems Mech Engn, St Petersburg 199178, Russia.
[Barabash, Rozaliya I.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Trenkler, Johann] Carl Zeiss SMT AG, Lithog Opt Div, D-73447 Oberkochen, Germany.
RP Del Genio, CI (reprint author), Univ Houston, Dept Phys, 617 Sci & Res 1, Houston, TX 77204 USA.
RI Del Genio, Charo/F-7249-2010
OI Del Genio, Charo/0000-0001-9958-017X
FU NSF [DMR-0406323, DMR-0908286]; Texas Center for Superconductivity at
the University of Houston (TcSUH); U.S. Department of Energy
FX This work is supported by the NSF through Grants No. DMR-0406323 and No.
DMR-0908286 (K.E.B. and C.I.D.G.). K.E.B., C.I.D.G. and S.C.M. also
acknowledge support by the Texas Center for Superconductivity at the
University of Houston (TcSUH). R.I.B. is supported by the Division of
Materials Science and Engineering, Office of Basic Energy Science, U.S.
Department of Energy. We gratefully acknowledge M.E. Fisher for his
valuable comments and discussions.
NR 28
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144111
DI 10.1103/PhysRevB.81.144111
PG 10
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200041
ER
PT J
AU Du, MH
Singh, DJ
AF Du, Mao-Hua
Singh, David J.
TI Enhanced Born charge and proximity to ferroelectricity in thallium
halides
SO PHYSICAL REVIEW B
LA English
DT Article
ID GENERALIZED GRADIENT APPROXIMATION; RADIATION DETECTOR; PEROVSKITE
OXIDES; BROMIDE; TLBR; PERFORMANCE; CRYSTALS; POLYMORPHISM;
PURIFICATION; DISPERSION
AB Electronic-structure and lattice-dynamics calculations on thallium halides show that the Born effective charges in these compounds are more than twice larger than the nominal ionic charges. This is a result of cross-band-gap hybridization between Tl p and halogen-p states. The large Born charges cause giant splitting between longitudinal and transverse-optic phonon modes, bringing the lattice close to ferroelectric instability. Our calculations indeed show that cubic TlBr develops ferroelectric instabilities upon lattice expansion starting at 2%. It is remarkable that the apparently ionic thallium halides with a simple cubic CsCl structure and large differences in electronegativity between cations and anions can be very close to ferroelectricity. This can lead to effective screening of defects and impurities that would otherwise be strong carrier traps and may therefore contribute to the relatively good carrier transport properties in TlBr radiation detectors.
C1 [Du, Mao-Hua; Singh, David J.] Oak Ridge Natl Lab, Div & Ctr Radiat Detect Mat & Syst, Oak Ridge, TN 37831 USA.
RP Du, MH (reprint author), Oak Ridge Natl Lab, Div & Ctr Radiat Detect Mat & Syst, Oak Ridge, TN 37831 USA.
RI Du, Mao-Hua/B-2108-2010; Singh, David/I-2416-2012
OI Du, Mao-Hua/0000-0001-8796-167X;
FU U.S. DOE Office of Nonproliferation Research and Development [NA22]
FX We are grateful for the helpful discussions with Zane W. Bell and Lynn
A. Boatner. This work was supported by the U.S. DOE Office of
Nonproliferation Research and Development (NA22).
NR 31
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144114
DI 10.1103/PhysRevB.81.144114
PG 5
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200044
ER
PT J
AU Farrow, CL
Ruan, CY
Billinge, SJL
AF Farrow, Christopher L.
Ruan, Chong-Yu
Billinge, Simon J. L.
TI Quantitative nanoparticle structures from electron crystallography data
SO PHYSICAL REVIEW B
LA English
DT Article
ID PAIR DISTRIBUTION FUNCTION; LEAST-SQUARES REFINEMENT; X-RAY; ULTRAFAST
DIFFRACTION; MOLECULAR STRUCTURES; PHASE-TRANSITIONS; DYNAMICS; SIZE;
NANOCRYSTALLOGRAPHY; POLYCRYSTALLINE
AB We describe the quantitative refinement of nanoparticle structures from gold nanoparticles probed by electron diffraction in the ultrafast electron crystallography (UEC) geometry. We establish the equivalence between the modified radial distribution function employed in UEC and the atomic pair distribution function (PDF) used in x-ray and neutron powder-diffraction analysis. By leveraging PDF refinement techniques, we demonstrate that UEC data are of sufficient quality to differentiate between cuboctahedral, decahedral, and icosahedral nanoparticle models for the ground-state (dark) structures of the gold nanoparticles. Furthermore, we identify the signatures of systematic errors that may occur during data reduction and show that atomic positions refined from UEC are robust to these errors. This work serves as a foundation for reliable quantitative structural analysis of time-resolved laser-excited nanoparticle states.
C1 [Farrow, Christopher L.; Billinge, Simon J. L.] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
[Ruan, Chong-Yu] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA.
[Billinge, Simon J. L.] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
RP Farrow, CL (reprint author), Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
EM sb2896@columbia.edu
FU U.S. National Science Foundation [DMR-0703940]
FX This work was supported by the U.S. National Science Foundation through
Grant No. DMR-0703940.
NR 51
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U2 23
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134104
DI 10.1103/PhysRevB.81.134104
PG 8
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900020
ER
PT J
AU Fernandes, RM
Pratt, DK
Tian, W
Zarestky, J
Kreyssig, A
Nandi, S
Kim, MG
Thaler, A
Ni, N
Canfield, PC
McQueeney, RJ
Schmalian, J
Goldman, AI
AF Fernandes, Rafael M.
Pratt, Daniel K.
Tian, Wei
Zarestky, Jerel
Kreyssig, Andreas
Nandi, Shibabrata
Kim, Min Gyu
Thaler, Alex
Ni, Ni
Canfield, Paul C.
McQueeney, Robert J.
Schmalian, Joerg
Goldman, Alan I.
TI Unconventional pairing in the iron arsenide superconductors
SO PHYSICAL REVIEW B
LA English
DT Article
ID CUPRATE SUPERCONDUCTORS; SYMMETRY; PNICTIDES; STATE
AB We use magnetic long-range order as a tool to probe the Cooper-pair wave function in the iron arsenide superconductors. We show theoretically that antiferromagnetism and superconductivity can coexist in these materials only if Cooper pairs form an unconventional, sign-changing state. The observation of coexistence in Ba(Fe1-xCox)2As2 then demonstrates unconventional pairing in this material. The detailed agreement between theory and neutron-diffraction experiments, in particular, for the unusual behavior of the magnetic order below T-c, demonstrates the robustness of our conclusions. Our findings strongly suggest that superconductivity is unconventional in all members of the iron arsenide family.
C1 [Fernandes, Rafael M.] US DOE, Ames Lab, Ames, IA 50011 USA.
Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
RP Fernandes, RM (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA.
EM rafaelmf@ameslab.gov
RI Schmalian, Joerg/H-2313-2011; Kim, Min Gyu/B-8637-2012; Fernandes,
Rafael/E-9273-2010; Tian, Wei/C-8604-2013; Canfield, Paul/H-2698-2014;
Thaler, Alexander/J-5741-2014; McQueeney, Robert/A-2864-2016
OI Kim, Min Gyu/0000-0001-7676-454X; Tian, Wei/0000-0001-7735-3187; Thaler,
Alexander/0000-0001-5066-8904; McQueeney, Robert/0000-0003-0718-5602
FU U.S. DOE, Office of BES, DMSE; Iowa State University [DE-AC02-07CH11358]
FX We thank Alfred Kracher for performing the WDS measurements and Sergey
Bud'ko for assistance with the thermodynamic and transport measurements.
This work was supported by the U.S. DOE, Office of BES, DMSE. Ames
Laboratory is operated for the U.S. DOE by Iowa State University under
Contract No. DE-AC02-07CH11358.
NR 34
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U1 4
U2 39
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 140501
DI 10.1103/PhysRevB.81.140501
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200020
ER
PT J
AU Ganesh, P
Cockayne, E
Ahart, M
Cohen, RE
Burton, B
Hemley, RJ
Ren, Y
Yang, WG
Ye, ZG
AF Ganesh, P.
Cockayne, E.
Ahart, M.
Cohen, R. E.
Burton, B.
Hemley, Russell J.
Ren, Yang
Yang, Wenge
Ye, Z. -G.
TI Origin of diffuse scattering in relaxor ferroelectrics
SO PHYSICAL REVIEW B
LA English
DT Article
ID SINGLE-CRYSTALS; PEROVSKITES; BEHAVIOR; ORDER
AB High-pressure and variable temperature single-crystal synchrotron x-ray measurements combined with first principles based molecular-dynamics simulations were used to study diffuse scattering in the relaxor ferroelectric system PbSc1/2Nb1/2O3. Constant temperature experiments show a pressure-induced transition to the relaxor phase, in which butterfly- and rod-shaped diffuse scattering occurs around the {h00} and {hh0} Bragg spots. Simulations qualitatively reproduce the observed diffuse scattering features as well as their pressure-temperature behavior and show that they arise from polarization correlations between chemically ordered regions, which in previous simulations were shown to behave as polar nanoregions. Simulations also exhibit radial diffuse scattering [elongated toward and away from Q=(000)] that persists even in the paraelectric phase; consistent with previous neutron experiments on PbMg1/3Nb2/3O3.
C1 [Ganesh, P.; Ahart, M.; Cohen, R. E.; Hemley, Russell J.] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA.
[Cockayne, E.; Burton, B.] NIST, Div Ceram, Mat Sci & Engn Lab, Gaithersburg, MD 20899 USA.
[Ren, Yang; Yang, Wenge] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[Ye, Z. -G.] Simon Fraser Univ, Dept Chem, Burnaby, BC V5A 1S6, Canada.
[Ye, Z. -G.] Simon Fraser Univ, LABS 4D, Burnaby, BC V5A 1S6, Canada.
RP Ganesh, P (reprint author), Carnegie Inst Sci, Geophys Lab, 5251 Broad Branch Rd, Washington, DC 20015 USA.
RI Ganesh, Panchapakesan/E-3435-2012; Yang, Wenge/H-2740-2012; Ganesh,
Panchapakesan/L-5571-2013; Cohen, Ronald/B-3784-2010
OI Ganesh, Panchapakesan/0000-0002-7170-2902; Cohen,
Ronald/0000-0001-5871-2359
FU Office of Naval Research [N00014-07-1-0451, N00014-02-1-0506];
Carnegie/Department of Energy Alliance Center (CDAC) [DE-FC0303NA00144];
(U.S.) Department of Energy [DE-AC02-06CH11357]
FX The authors thank S. Gramsch and E. Venturini for their useful
discussions. This work was sponsored by the Office of Naval Research
under Grants No. N00014-07-1-0451 and No. N00014-02-1-0506 and the
Carnegie/Department of Energy Alliance Center (CDAC, Grant No.
DE-FC0303NA00144). Use of the Advanced Photon Source was supported by
the (U.S.) Department of Energy under Contract No. DE-AC02-06CH11357.
NR 27
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U2 31
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144102
DI 10.1103/PhysRevB.81.144102
PG 7
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200032
ER
PT J
AU Hiraka, H
Hayashi, Y
Wakimoto, S
Takeda, M
Kakurai, K
Adachi, T
Koike, Y
Yamada, I
Miyazaki, M
Hiraishi, M
Takeshita, S
Kohda, A
Kadono, R
Tranquada, JM
Yamada, K
AF Hiraka, H.
Hayashi, Y.
Wakimoto, S.
Takeda, M.
Kakurai, K.
Adachi, T.
Koike, Y.
Yamada, I.
Miyazaki, M.
Hiraishi, M.
Takeshita, S.
Kohda, A.
Kadono, R.
Tranquada, J. M.
Yamada, K.
TI Incommensurate spin correlations induced by magnetic Fe ions substituted
into overdoped Bi1.75Pb0.35Sr1.90CuO6+z
SO PHYSICAL REVIEW B
LA English
DT Article
ID HIGH-TEMPERATURE SUPERCONDUCTOR; COPPER-OXIDE SUPERCONDUCTORS; DOPED
LA2-XSR(X)CUO4; LA2-XSRXCUO4; EXCITATIONS; MODULATION; SCATTERING;
DYNAMICS; STATE; PHASE
AB Spin correlations in the overdoped region of Bi1.75Pb0.35Sr1.90CuO6+z have been explored with Fe-doped single crystals characterized by neutron scattering, muon-spin-rotation spectroscopy, and magnetic-susceptibility measurements. Static incommensurate spin correlations induced by the Fe spins are revealed by elastic neutron scattering. The resultant incommensurability delta is unexpectedly large (similar to 0.2 r.l.u.), as compared with delta similar to 1/8 in overdoped superconductor La2-xSrxCuO4. Intriguingly, the large delta in this overdoped region is close to the hole concentration p. This result is reminiscent of the delta approximate to p trend observed in underdoped La2-xSrxCuO4; however, it is inconsistent with the saturation of delta in the latter compound in the overdoped regime. While our findings in Fe-doped Bi1.75Pb0.35Sr1.90CuO6+z support the commonality of incommensurate spin correlations in high-T-c cuprate superconductors, they also suggest that the magnetic response might be dominated by a distinct mechanism in the overdoped region.
C1 [Hiraka, H.; Hayashi, Y.] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan.
[Wakimoto, S.; Takeda, M.; Kakurai, K.] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Tokai, Ibaraki 3191195, Japan.
[Adachi, T.; Koike, Y.] Tohoku Univ, Dept Appl Phys, Sendai, Miyagi 9808578, Japan.
[Yamada, I.] Ehime Univ, Grad Sch Sci & Engn, Matsuyama, Ehime 7908577, Japan.
[Miyazaki, M.; Hiraishi, M.; Kohda, A.; Kadono, R.] Grad Univ Adv Studies, Dept Mat Struct Sci, Tsukuba, Ibaraki 3050801, Japan.
[Takeshita, S.; Kohda, A.; Kadono, R.] High Energy Accelerator Res Org, Inst Mat Struct Sci, Tsukuba, Ibaraki 30050801, Japan.
[Tranquada, J. M.] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
[Yamada, K.] Tohoku Univ, Adv Inst Mat Res, WPI Res Ctr, Sendai, Miyagi 9808577, Japan.
RP Hiraka, H (reprint author), Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan.
RI Yamada, Kazuyoshi/C-2728-2009; Tranquada, John/A-9832-2009
OI Tranquada, John/0000-0003-4984-8857
FU MEXT [19540358, 19340090]; U.S. Department of Energy, Office of Basic
Energy Sciences, Division of Materials Sciences and Engineering
[DE-AC0-298CH110886]
FX We are grateful to K. Kudo, H. Kobayashi, D. Matsumura, and T. Sato for
their helpful discussions. We also thank K. Nemoto and M. Sakurai for
their assistance in the neutron-scattering and crystal-growth
experiments, respectively. This study was carried out under the
Common-Use Facility Program of JAEA, and the Quantum Beam Technology
Program of JST. The study performed at Tohoku University was supported
by a Grant-In-Aid for Science Research C (Grant No. 19540358) and B
(Grant No. 19340090) from the MEXT. J.M.T. is supported by the U.S.
Department of Energy, Office of Basic Energy Sciences, Division of
Materials Sciences and Engineering, under Contract No.
DE-AC0-298CH110886.
NR 36
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U1 2
U2 6
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144501
DI 10.1103/PhysRevB.81.144501
PG 6
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200097
ER
PT J
AU Holcomb, MB
Martin, LW
Scholl, A
He, Q
Yu, P
Yang, CH
Yang, SY
Glans, PA
Valvidares, M
Huijben, M
Kortright, JB
Guo, J
Chu, YH
Ramesh, R
AF Holcomb, M. B.
Martin, L. W.
Scholl, A.
He, Q.
Yu, P.
Yang, C. -H.
Yang, S. Y.
Glans, P. -A.
Valvidares, M.
Huijben, M.
Kortright, J. B.
Guo, J.
Chu, Y. -H.
Ramesh, R.
TI Probing the evolution of antiferromagnetism in multiferroics
SO PHYSICAL REVIEW B
LA English
DT Article
ID ELECTRIC POLARIZATION; MAGNETIC-STRUCTURES; LINEAR DICHROISM; FIELD
CONTROL; BIFEO3 FILMS; FERROMAGNETISM; TEMPERATURE; MANGANITES;
DEPENDENCE; TRANSITION
AB This study delineates the evolution of magnetic order in epitaxial films of the room-temperature multiferroic BiFeO(3) system. Using angle-and temperature-dependent dichroic measurements and spectromicroscopy, we have observed that the antiferromagnetic order in the model multiferroic BiFeO(3) evolves systematically as a function of thickness and strain. Lattice-mismatch-induced strain is found to break the easy-plane magnetic symmetry of the bulk and leads to an easy axis of magnetization which can be controlled through strain. Understanding the evolution of magnetic structure and how to manipulate the magnetism in this model multiferroic has significant implications for utilization of such magnetoelectric materials in future applications.
C1 [Holcomb, M. B.; He, Q.; Yu, P.; Yang, C. -H.; Yang, S. Y.; Chu, Y. -H.; Ramesh, R.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Holcomb, M. B.] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA.
[Martin, L. W.; Valvidares, M.; Ramesh, R.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
[Martin, L. W.] Univ Illinois, Frederick Seitz Mat Res Lab, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
[Scholl, A.; Glans, P. -A.; Kortright, J. B.; Guo, J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA.
[Huijben, M.] Univ Twente, MESA Inst Nanotechnol, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands.
[Chu, Y. -H.] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan.
[Ramesh, R.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
RP Holcomb, MB (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM mikel.holcomb@mail.wvu.edu
RI Valvidares, Secundino /M-4979-2016; Ying-Hao, Chu/A-4204-2008; He,
Qing/E-3202-2010; YANG, CHAN-HO/C-2079-2011; Martin, Lane/H-2409-2011;
MSD, Nanomag/F-6438-2012; Yu, Pu/F-1594-2014; Scholl,
Andreas/K-4876-2012; Glans, Per-Anders/G-8674-2016;
OI Valvidares, Secundino /0000-0003-4895-8114; Ying-Hao,
Chu/0000-0002-3435-9084; Martin, Lane/0000-0003-1889-2513; Holcomb,
Mikel/0000-0003-2111-3410
FU Office of Basic Energy Sciences, Materials Science Division of the U. S.
Department of Energy [DE-AC02-05CH11231]; Korea Research Foundation
Grant (MOEHRD) [KRF-2006-214-C00020]; National Science Council, R.O.C.
[NSC 98-2119-M-009-016]
FX This work has been supported by the Director, Office of Basic Energy
Sciences, Materials Science Division of the U. S. Department of Energy
under Contract No. DE-AC02-05CH11231. C. H. Y. was supported by a Korea
Research Foundation Grant (MOEHRD) (KRF-2006-214-C00020). Y. H. C. would
like to acknowledge the support of the National Science Council, R.O.C.,
under Contract No. NSC 98-2119-M-009-016.
NR 34
TC 47
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U1 6
U2 56
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134406
DI 10.1103/PhysRevB.81.134406
PG 6
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900041
ER
PT J
AU Klepeis, JHP
Cynn, H
Evans, WJ
Rudd, RE
Yang, LH
Liermann, HP
Yang, WG
AF Klepeis, Jae-Hyun Park
Cynn, Hyunchae
Evans, William J.
Rudd, Robert E.
Yang, Lin H.
Liermann, Hans Peter
Yang, Wenge
TI Diamond anvil cell measurement of high-pressure yield strength of
vanadium using in situ thickness determination
SO PHYSICAL REVIEW B
LA English
DT Article
ID HIGH HYDROSTATIC-PRESSURE; FLOW-STRESS; POLYCRYSTALS; DEFORMATION;
DYNAMICS; METALS; MGO
AB The pressure dependence of the quasistatic yield strength of vanadium in polycrystalline foils and powders has been measured up to 90 GPa at room temperature using an implementation of a nonhydrostatic diamond-anvil cell technique, an extension of the technique of Meade and Jeanloz [C. Meade and R. Jeanloz, J. Geophys. Res. 93, 3261 (1988)]. A feature present in this work is the use of an in situ determination of the sample thickness and pressure profile using synchrotron x-ray techniques, allowing a determination of the strength at each point across the sample. Following an initial increase in the strength with pressure, a decrease in the strength of vanadium was observed starting at similar to 40-50 GPa. The softening of the yield strength of vanadium at high pressure is quite surprising and unusual, following the trend of an unusual softening of the shear modulus associated with a subtle phase transition from body-centered-cubic-to-rhombohedral structure in a recent x-ray diffraction experiment.
C1 [Klepeis, Jae-Hyun Park; Cynn, Hyunchae; Evans, William J.; Rudd, Robert E.; Yang, Lin H.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
[Liermann, Hans Peter; Yang, Wenge] Argonne Natl Lab, HP CAT, Adv Photon Source, Argonne, IL 60439 USA.
RP Klepeis, JHP (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA.
FU DOE-BES [DE-AC0206CH11357]; DOE-NNSA (CDAC); NSF; W. M. Keck Foundation;
Laboratory Directed Research and Development program office at LLNL
[08-ERD-035]; U.S. Department of Energy by Lawrence Livermore National
Laboratory [DE-AC5207-NA27344]
FX We would like to thank Guoyin Shen and Olga Shebanova for experimental
assistance at HP-CAT, Argonne National Laboratory, Argonne, IL. Further
thanks go to Jeff Florando and Samuel Weir for useful discussions.
Portions of this work were performed at HPCAT (Sector 16), Advanced
Photon Source (APS), Argonne National Laboratory. Use of the HPCAT
facility was supported by DOE-BES, DOE-NNSA (CDAC), NSF, and the W. M.
Keck Foundation. Use of the APS was supported by DOE-BES, under Contract
No. DE-AC0206CH11357. This work was supported by the Laboratory Directed
Research and Development program office (Project No. 08-ERD-035) at LLNL
and performed under the auspices of the U.S. Department of Energy by
Lawrence Livermore National Laboratory under Contract No.
DE-AC5207-NA27344.
NR 41
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U2 20
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134107
DI 10.1103/PhysRevB.81.134107
PG 6
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900023
ER
PT J
AU Kreyssig, A
Kim, MG
Nandi, S
Pratt, DK
Tian, W
Zarestky, JL
Ni, N
Thaler, A
Bud'ko, SL
Canfield, PC
McQueeney, RJ
Goldman, AI
AF Kreyssig, A.
Kim, M. G.
Nandi, S.
Pratt, D. K.
Tian, W.
Zarestky, J. L.
Ni, N.
Thaler, A.
Bud'ko, S. L.
Canfield, P. C.
McQueeney, R. J.
Goldman, A. I.
TI Suppression of antiferromagnetic order and orthorhombic distortion in
superconducting Ba(Fe0.961Rh0.039)(2)As-2
SO PHYSICAL REVIEW B
LA English
DT Article
AB Neutron-diffraction and high-resolution x-ray diffraction studies find that, similar to the closely related underdoped Ba(Fe1-xCox)(2)As-2 superconducting compounds, Ba(Fe0.961Rh0.039)(2)As-2 shows strong evidence of competition and coexistence between superconductivity and antiferromagnetic order below the superconducting transition, T-c=14 K. The transition temperatures for both the magnetic order and orthorhombic distortion are in excellent agreement with those inferred from resistivity measurements, and both order parameters manifest a distinct decrease in magnitude below T-c. These data suggest that the strong interaction between magnetism and superconductivity is a general feature of electron-doped Ba(Fe1-xTMx)(2)As-2 superconductors (TM=transition metal).
C1 [Kreyssig, A.] US DOE, Ames Lab, Ames, IA 50011 USA.
Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
RP Kreyssig, A (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA.
RI Kim, Min Gyu/B-8637-2012; Tian, Wei/C-8604-2013; Canfield,
Paul/H-2698-2014; Thaler, Alexander/J-5741-2014; McQueeney,
Robert/A-2864-2016
OI Kim, Min Gyu/0000-0001-7676-454X; Tian, Wei/0000-0001-7735-3187; Thaler,
Alexander/0000-0001-5066-8904; McQueeney, Robert/0000-0003-0718-5602
FU U.S. Department of Energy, Office of Basic Energy Science, Division of
Materials Sciences and Engineering; U.S. Department of Energy by Iowa
State University [DE-AC02-07CH11358]; U.S. Department of Energy, Office
of Basic Energy Sciences, Scientific User Facilities Division
FX We thank A. Kracher for performing the WDS measurements. This work was
supported by the U.S. Department of Energy, Office of Basic Energy
Science, Division of Materials Sciences and Engineering. The research
was performed at the Ames Laboratory. Ames Laboratory is operated for
the U.S. Department of Energy by Iowa State University under Contract
No. DE-AC02-07CH11358. Work at Oak Ridge National Laboratory is
supported by U.S. Department of Energy, Office of Basic Energy Sciences,
Scientific User Facilities Division.
NR 23
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U2 6
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134512
DI 10.1103/PhysRevB.81.134512
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900087
ER
PT J
AU Lazarevic, N
Popovic, ZV
Hu, RW
Petrovic, C
AF Lazarevic, N.
Popovic, Z. V.
Hu, Rongwei
Petrovic, C.
TI Evidence for electron-phonon interaction in Fe1-xMxSb2 (M=Co and Cr; 0
<= x <= 0.5) single crystals
SO PHYSICAL REVIEW B
LA English
DT Article
ID SCATTERING
AB We have measured polarized Raman scattering spectra of the Fe1-xCoxSb2 and Fe1-xCrxSb2 (0 <= x <= 0.5) single crystals in the temperature range between 15 and 300 K. The highest energy B-1g symmetry mode shows significant line asymmetry due to phonon-mode coupling-width electronic background. The coupling constant achieves the highest value at about 40 K and after that it remains temperature independent. Origin of additional mode broadening is pure anharmonic. Below 40 K the coupling is drastically reduced, in agreement with transport properties measurements. Alloying of FeSb2 with Co and Cr produces the B-1g mode narrowing, i.e., weakening of the electron-phonon interaction. In the case of A(g) symmetry modes we have found a significant mode mixing.
C1 [Lazarevic, N.; Popovic, Z. V.] Inst Phys, Ctr Solid State Phys & New Mat, Belgrade 11080, Serbia.
[Hu, Rongwei; Petrovic, C.] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
RP Lazarevic, N (reprint author), Inst Phys, Ctr Solid State Phys & New Mat, Pregrevica 118, Belgrade 11080, Serbia.
RI Lazarevic, Nenad/C-3254-2012; Hu, Rongwei/E-7128-2012; Petrovic,
Cedomir/A-8789-2009
OI Petrovic, Cedomir/0000-0001-6063-1881
FU Serbian Ministry of Science and Technological Development [141047];
Brookhaven Science Associates [DE-Ac02-98CH10886]
FX We have the pleasure to thank Zorana Dohcevic-Mitrovic for helpful
discussion. This work was supported by the Serbian Ministry of Science
and Technological Development under Project No. 141047. Part of this
work was carried out at the Brookhaven National Laboratory which is
operated for the Office of Basic Energy Sciences, U.S. Department of
Energy by Brookhaven Science Associates (Grant No. DE-Ac02-98CH10886).
NR 16
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144302
DI 10.1103/PhysRevB.81.144302
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200063
ER
PT J
AU Littlewood, PB
Mihaila, B
Albers, RC
AF Littlewood, P. B.
Mihaila, B.
Albers, R. C.
TI Electron-phonon coupling in semimetals in a high magnetic field
SO PHYSICAL REVIEW B
LA English
DT Article
ID MAGNETOSTRICTION; BISMUTH
AB We consider the effect of electron-phonon coupling in semimetals in high magnetic fields with regard to elastic modes that can lead to a redistribution of carriers between pockets. We show that in a clean three-dimensional system, at each Landau-level crossing, this leads to a discontinuity in the magnetostriction, and a divergent contribution to the elastic modulus. We estimate the magnitude of this effect in the group V semimetal bismuth.
C1 [Littlewood, P. B.] Univ Cambridge, Condensed Matter Theory Grp, Cavevdish Lab, Cambridge CB3 0HE, England.
[Mihaila, B.; Albers, R. C.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Littlewood, PB (reprint author), Univ Cambridge, Condensed Matter Theory Grp, Cavevdish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England.
RI Littlewood, Peter/B-7746-2008; Mihaila, Bogdan/D-8795-2013
OI Mihaila, Bogdan/0000-0002-1489-8814
FU Engineering and Physical Sciences Research Council (EPSRC); Los Alamos
National Laboratory under the auspices of the U.S. Department of Energy
FX P. B. L. thanks Los Alamos National Laboratory and the National High
Magnetic Field Laboratory for hospitality during this work. We are
grateful to S. Riggs for discussions and for the sight of preliminary
data. The authors gratefully acknowledge useful conversations with D. L.
Smith. This work was supported in part by the Engineering and Physical
Sciences Research Council (EPSRC) and the Los Alamos National Laboratory
under the auspices of the U.S. Department of Energy.
NR 14
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144421
DI 10.1103/PhysRevB.81.144421
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200085
ER
PT J
AU Louca, D
Horigane, K
Llobet, A
Arita, R
Ji, S
Katayama, N
Konbu, S
Nakamura, K
Koo, TY
Tong, P
Yamada, K
AF Louca, Despina
Horigane, K.
Llobet, A.
Arita, R.
Ji, S.
Katayama, N.
Konbu, S.
Nakamura, K.
Koo, T. -Y.
Tong, P.
Yamada, K.
TI Local atomic structure of superconducting FeSe1-xTex
SO PHYSICAL REVIEW B
LA English
DT Article
ID IRON; PSEUDOPOTENTIALS; SMFEASO1-XFX; ORDER
AB The isovalent substitution of Te for Se in the superconducting alpha-FeSe raises T-C where the average chalcogen-Fe bond angle decreases and the chalcogen-Fe distance increases. Locally, however, the Se and Te ions do not share the same site and have two distinct z coordinates, in contrast to what is presumed in the P4/nmm symmetry. The local bond angle between the chalcogens and Fe increases with the substitution, consistent with the rise in T-C, the Fe-Te bonds become shorter than in the binary FeTe, while the Fe-Se bonds stay the same as in the binary. Ab initio calculations based on spin density functional theory yielded an optimized structure with distinct z coordinates for Se and Te, in addition to a stronger hybridization of Te with Fe.
C1 [Louca, Despina; Ji, S.; Katayama, N.; Tong, P.] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA.
[Horigane, K.] Tohoku Univ, WPI Adv Inst Mat Res, Aoba Ku, Sendai, Miyagi 9808577, Japan.
[Llobet, A.; Yamada, K.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Arita, R.; Konbu, S.; Nakamura, K.] Univ Tokyo, Dept Appl Phys, Tokyo 1138656, Japan.
[Arita, R.; Nakamura, K.] TRIP, JST, Chiyoda Ku, Tokyo 1020075, Japan.
[Koo, T. -Y.] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Pohang 790784, South Korea.
RP Louca, D (reprint author), Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA.
RI Ji, Sungdae/G-3808-2010; Horigane, Kazumasa/B-7763-2010; Yamada,
Kazuyoshi/C-2728-2009; Tong, Peng/B-6783-2011; Llobet, Anna/B-1672-2010;
Arita, Ryotaro/D-5965-2012
OI Ji, Sungdae/0000-0001-6736-3103; Arita, Ryotaro/0000-0001-5725-072X
FU U.S. Department of Energy, Division of Materials Science
[DE-FG02-01ER45927]
FX We thank Z. Tesanovic and M. Norman for helpful discussions. This work
is supported by the U.S. Department of Energy, Division of Materials
Science under Grant No. DE-FG02-01ER45927 and the Los Alamos National
Laboratory is operated by the Los Alamos National Security LLC.
NR 34
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134524
DI 10.1103/PhysRevB.81.134524
PG 8
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900099
ER
PT J
AU Ovsyannikov, SV
Polian, A
Munsch, P
Chervin, JC
Le Marchand, G
Aselage, TL
AF Ovsyannikov, Sergey V.
Polian, Alain
Munsch, Pascal
Chervin, Jean-Claude
Le Marchand, Gilles
Aselage, Terrence L.
TI Raman spectroscopy of B12As2 and B12P2 up to 120 GPa: Evidence for
structural distortion
SO PHYSICAL REVIEW B
LA English
DT Article
ID HIGH-PRESSURE PROPERTIES; BORON-CARBIDE; SOLID BORON; DIAMOND
AB We report results of Raman spectroscopy studies on single crystals of B12P2 and B12As2 under pressure to 120 GPa at 300 K. In the 75-85 GPa range in both compounds several additional modes appear while several other split. These results evidence a transition to a distorted structure with a strong deformation of the icosahedra. The Raman spectra measured at ambient down from 120 GPa show that this transformation is reversible.
C1 [Ovsyannikov, Sergey V.; Polian, Alain; Munsch, Pascal; Chervin, Jean-Claude; Le Marchand, Gilles] Univ Paris 06, Inst Mineral & Phys Milieux Condenses, CNRS, F-75015 Paris, France.
[Ovsyannikov, Sergey V.] Russian Acad Sci, Urals Div, Inst Met Phys, High Pressure Grp, Ekaterinburg 620041, Russia.
[Aselage, Terrence L.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Ovsyannikov, SV (reprint author), Univ Paris 06, Inst Mineral & Phys Milieux Condenses, CNRS, 140 Rue Lourmel, F-75015 Paris, France.
EM sergey2503@gmail.com
RI Ovsyannikov, Sergey/J-7802-2012; Polian, Alain/E-1555-2017
OI Ovsyannikov, Sergey/0000-0003-1027-0998; Polian,
Alain/0000-0003-2261-9114
FU Russian Foundation for Basic Research [07-08-00338]; United States
Department of Energy [DE-AC04-94AL8500]
FX One of us, S.V.O., acknowledges the financial support from the "Mairie
de Paris" and from the Russian Foundation for Basic Research (Grant No.
07-08-00338). Sandia is a multiprogram laboratory operated by Sandia
Corporation, a Lockheed Martin Co., for the United States Department of
Energy, under Contract No. DE-AC04-94AL8500.
NR 34
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U1 1
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 140103
DI 10.1103/PhysRevB.81.140103
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200003
ER
PT J
AU Pratt, DK
Kreyssig, A
Nandi, S
Ni, N
Thaler, A
Lumsden, MD
Tian, W
Zarestky, JL
Bud'ko, SL
Canfield, PC
Goldman, AI
McQueeney, RJ
AF Pratt, D. K.
Kreyssig, A.
Nandi, S.
Ni, N.
Thaler, A.
Lumsden, M. D.
Tian, W.
Zarestky, J. L.
Bud'ko, S. L.
Canfield, P. C.
Goldman, A. I.
McQueeney, R. J.
TI Dispersion of the superconducting spin resonance in underdoped and
antiferromagnetic BaFe2As2
SO PHYSICAL REVIEW B
LA English
DT Article
ID T-C; UPD2AL3
AB Inelastic neutron-scattering measurements have been performed on underdoped Ba(Fe1-xCox)(2)As-2 (x=4.7%) where superconductivity and long-range antiferromagnetic (AFM) order coexist. The magnetic spectrum found in the normal state is strongly damped and develops into a magnetic resonance feature below T-c that has appreciable dispersion along c axis with a bandwidth of 3-4 meV. This is in contrast to the optimally doped x=8.0% composition, with no long-range AFM order, where the resonance exhibits a much weaker dispersion. [see M. D. Lumsden et al., Phys. Rev. Lett. 102, 107005 (2009).] The results suggest that the resonance dispersion arises from interlayer spin correlations present in the AFM ordered state.
C1 [Pratt, D. K.; Kreyssig, A.; Nandi, S.; Ni, N.; Thaler, A.; Tian, W.; Zarestky, J. L.; Bud'ko, S. L.; Canfield, P. C.; Goldman, A. I.; McQueeney, R. J.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Pratt, D. K.; Kreyssig, A.; Nandi, S.; Ni, N.; Thaler, A.; Tian, W.; Zarestky, J. L.; Bud'ko, S. L.; Canfield, P. C.; Goldman, A. I.; McQueeney, R. J.] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
[Lumsden, M. D.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Pratt, DK (reprint author), Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
RI Tian, Wei/C-8604-2013; Canfield, Paul/H-2698-2014; Thaler,
Alexander/J-5741-2014; McQueeney, Robert/A-2864-2016; Lumsden,
Mark/F-5366-2012
OI Tian, Wei/0000-0001-7735-3187; Thaler, Alexander/0000-0001-5066-8904;
McQueeney, Robert/0000-0003-0718-5602; Lumsden, Mark/0000-0002-5472-9660
FU U.S. Department of Energy Office of Science [DE-AC02 07CH11358];
Scientific User Facilities Division, Office of Basic Energy Sciences
FX The authors would like to thank J. Schmalian, V. P. Antropov, M. R.
Norman, R. M. Fernandes, and I. Eremin for valuable comments. Work at
the Ames Laboratory is supported by the U.S. Department of Energy Office
of Science under Contract No. DE-AC02 07CH11358. Work at Oak Ridge
National Laboratory is supported by the Scientific User Facilities
Division, Office of Basic Energy Sciences.
NR 23
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 140510
DI 10.1103/PhysRevB.81.140510
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200029
ER
PT J
AU Ratcliff, W
Kienzle, PA
Lynn, JW
Li, SL
Dai, PC
Chen, GF
Wang, NL
AF Ratcliff, W.
Kienzle, P. A.
Lynn, Jeffrey W.
Li, Shiliang
Dai, Pengcheng
Chen, G. F.
Wang, N. L.
TI Magnetic form factor of SrFe2As2: Neutron diffraction measurements
SO PHYSICAL REVIEW B
LA English
DT Article
ID AUGMENTED LAGRANGIAN-METHODS; SUPERCONDUCTORS
AB Neutron diffraction measurements have been carried out to investigate the magnetic form factor of the parent SrFe2As2 system of the iron-based superconductors. The general feature is that the form factor is approximately isotropic in wave vector, indicating that multiple d orbitals of the iron atoms are occupied as expected based on band theory. Inversion of the diffraction data suggests that there is some elongation of the spin density toward the As atoms. We have also extended the diffraction measurements to investigate a possible jump in the c-axis lattice parameter at the structural phase transition but find no detectable change within the experimental uncertainties.
C1 [Ratcliff, W.; Kienzle, P. A.; Lynn, Jeffrey W.] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA.
[Li, Shiliang; Dai, Pengcheng] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
[Dai, Pengcheng] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA.
[Li, Shiliang; Dai, Pengcheng; Chen, G. F.; Wang, N. L.] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China.
RP Ratcliff, W (reprint author), NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA.
RI Li, Shiliang/B-9379-2009; Dai, Pengcheng /C-9171-2012
OI Dai, Pengcheng /0000-0002-6088-3170
FU U.S. DOE, BES, through DOE [DE-FG02-05ER46202]; U.S. DOE, Division of
Scientific User Facilities; CAS; 973 Program [2010CB833102]
FX The work at UT/ORNL is supported by the U.S. DOE, BES, through DOE Grant
No. DE-FG02-05ER46202, and in part by the U.S. DOE, Division of
Scientific User Facilities. The work at IOP, CAS is supported by CAS and
973 Program ( Program No. 2010CB833102).
NR 23
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U2 7
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 140502
DI 10.1103/PhysRevB.81.140502
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200021
ER
PT J
AU Reed, EJ
AF Reed, Evan J.
TI Atomic transformation pathways from terahertz radiation generated by
shock-induced phase transformations
SO PHYSICAL REVIEW B
LA English
DT Article
ID MOLECULAR-DYNAMICS; CDSE NANOCRYSTALS; HIGH-PRESSURE; TRANSITION;
MECHANISM; WURTZITE; POLARIZATION; ELECTRON; WAVES
AB This work shows that detectable terahertz (THz) frequency radiation can be emitted when a wurtzite-structure crystal transforms to a rocksalt structure under shock compression on picosecond time scales. Information about the atomic-scale transformation pathway is contained in the sign of the emitted THz electric field and information about the kinetics is contained in the time dependence. This phenomenon provides an avenue to experimental measurement of microscopic transformation pathways in crystals on the shortest (picosecond) time scales.
C1 [Reed, Evan J.] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94304 USA.
[Reed, Evan J.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Reed, EJ (reprint author), Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94304 USA.
EM evanreed@stanford.edu
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]
FX The author is grateful for helpful conversations with Michael Armstrong,
Aaron Lindenberg, Richard Martin, and Babak Sadiqh. This work was
supported by the LLNL LDRD program and performed in part under the
auspices of the U.S. Department of Energy by Lawrence Livermore National
Laboratory under Contract No. DE-AC52-07NA27344.
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2469-9950
EI 2469-9969
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144123
DI 10.1103/PhysRevB.81.144123
PG 7
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200053
ER
PT J
AU Sasmal, K
Lv, B
Tang, Z
Wei, FY
Xue, YY
Guloy, AM
Chu, CW
AF Sasmal, K.
Lv, B.
Tang, Z.
Wei, F. Y.
Xue, Y. Y.
Guloy, A. M.
Chu, C. W.
TI Lower critical field, anisotropy, and two-gap features of LiFeAs
SO PHYSICAL REVIEW B
LA English
DT Article
ID ANDREEV-REFLECTION SPECTROSCOPY; NODELESS SUPERCONDUCTING GAPS
AB The magnetic properties of LiFeAs, as single crystalline and polycrystalline samples, were investigated. The lower critical field deduced from the vortex penetration of two single crystals appears to be almost isotropic with a temperature dependence closer to that of two-gap superconductors. The parameters extracted from the reversible magnetizations of sintered polycrystalline samples are in good agreement with those from the single-crystal data.
C1 [Sasmal, K.; Wei, F. Y.; Xue, Y. Y.; Chu, C. W.] Univ Houston, Dept Phys, Houston, TX 77204 USA.
[Sasmal, K.; Lv, B.; Tang, Z.; Wei, F. Y.; Xue, Y. Y.; Guloy, A. M.] Univ Houston, TCSUH, Houston, TX 77204 USA.
[Lv, B.; Tang, Z.; Guloy, A. M.] Univ Houston, Dept Chem, Houston, TX 77204 USA.
[Chu, C. W.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Chu, C. W.] Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China.
RP Sasmal, K (reprint author), Univ Houston, Dept Phys, Houston, TX 77204 USA.
RI Lv, Bing/E-3485-2010
FU U.S. Air Force Office of Scientific Research; T. L. L. Temple
Foundation; John J. and Rebecca Moores Endowment; State of Texas through
the Texas Center for Superconductivity at the University of Houston;
U.S. Department of Energy [DE-AC03-76SF00098]; NSF [CHE-0616805]; R.A.
Welch Foundation
FX We thank V. Hadjiev for help in the Raman measurements of the crystals.
The work in Houston is supported in part by the U.S. Air Force Office of
Scientific Research, the T. L. L. Temple Foundation, the John J. and
Rebecca Moores Endowment, and the State of Texas through the Texas
Center for Superconductivity at the University of Houston; and at
Lawrence Berkeley Laboratory by the Director, Office of Science, Office
of Basic Energy Sciences, Division of Materials Sciences and Engineering
of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098.
A. M. G., B.L., and Z.T. acknowledge support from the NSF (Grant No.
CHE-0616805) and the R.A. Welch Foundation.
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144512
DI 10.1103/PhysRevB.81.144512
PG 5
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200108
ER
PT J
AU Sebastian, SE
Harrison, N
Altarawneh, MM
Liang, RX
Bonn, DA
Hardy, WN
Lonzarich, GG
AF Sebastian, Suchitra E.
Harrison, N.
Altarawneh, M. M.
Liang, Ruixing
Bonn, D. A.
Hardy, W. N.
Lonzarich, G. G.
TI Fermi-liquid behavior in an underdoped high-T-c superconductor
SO PHYSICAL REVIEW B
LA English
DT Article
ID INSULATOR; SURFACE; PHYSICS
AB We use magnetic quantum oscillations in the underdoped high T-c superconductor YBa2Cu3O6+x (x approximate to 0.56) measured over a broad range of temperatures 100 mK < T < 18 K to extract the form of the distribution function describing the low-lying quasiparticle excitations in high magnetic fields. Despite the proximity of YBa2Cu3O6.56 to a Mott insulating state, various broken symmetry ground states and/or states with different quasiparticle statistics, we find that our experimental results can be understood in terms of quasiparticle excitations obeying Fermi-Dirac statistics as in the Landau-Fermi liquid theory.
C1 [Sebastian, Suchitra E.; Lonzarich, G. G.] Univ Cambridge, Cavendish Lab, Cambridge CB3 OHE, England.
[Harrison, N.; Altarawneh, M. M.] LANL, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA.
[Liang, Ruixing; Bonn, D. A.; Hardy, W. N.] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada.
[Liang, Ruixing; Bonn, D. A.; Hardy, W. N.] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada.
RP Sebastian, SE (reprint author), Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 OHE, England.
EM suchitra@phy.cam.ac.uk; nharrison@lanl.gov
OI Harrison, Neil/0000-0001-5456-7756
FU U.S. Department of Energy, Office of Basic Energy Sciences; NSF,
Division of Materials Science and Engineering; State of Florida; Royal
Society; Trinity College (University of Cambridge)
FX This work was supported by the U.S. Department of Energy, Office of
Basic Energy Sciences, the NSF, Division of Materials Science and
Engineering, the State of Florida, the Royal Society, and Trinity
College (University of Cambridge).
NR 21
TC 34
Z9 34
U1 1
U2 6
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 140505
DI 10.1103/PhysRevB.81.140505
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200024
ER
PT J
AU Shoemaker, DP
Seshadri, R
Hector, AL
Llobet, A
Proffen, T
Fennie, CJ
AF Shoemaker, Daniel P.
Seshadri, Ram
Hector, Andrew L.
Llobet, Anna
Proffen, Thomas
Fennie, Craig J.
TI Atomic displacements in the charge ice pyrochlore Bi2Ti2O6O ' studied by
neutron total scattering
SO PHYSICAL REVIEW B
LA English
DT Article
ID CONTINUOUS SYMMETRY MEASURES; MAXIMUM-ENTROPY METHOD;
ELECTRON-DENSITY-DISTRIBUTION; LOCAL CRYSTAL-CHEMISTRY; AUGMENTED-WAVE
METHOD; STATISTICAL MECHANICS; DIFFUSE-SCATTERING; INFORMATION THEORY;
SPIN ICE; DISORDER
AB The oxide pyrochlore Bi2Ti2O6O' is known to be associated with large displacements of Bi and O' atoms from their ideal crystallographic positions. Neutron total scattering, analyzed in both reciprocal and real space, is employed here to understand the nature of these displacements. Rietveld analysis and maximum entropy methods are used to produce an average picture of the structural nonideality. Local structure is modeled via large-box reverse Monte Carlo simulations constrained simultaneously by the Bragg profile and real-space pair distribution function. Direct visualization and statistical analyses of these models show the precise nature of the static Bi and O' displacements. Correlations between neighboring Bi displacements are analyzed using coordinates from the large-box simulations. The framework of continuous symmetry measures has been applied to distributions of O'Bi-4 tetrahedra to examine deviations from ideality. Bi displacements from ideal positions appear correlated over local length scales. The results are consistent with the idea that these nonmagnetic lone-pair containing pyrochlore compounds can be regarded as highly structurally frustrated systems.
C1 [Shoemaker, Daniel P.; Seshadri, Ram] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA.
[Shoemaker, Daniel P.; Seshadri, Ram] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA.
[Hector, Andrew L.] Univ Southampton, Sch Chem, Southampton SO17 1BJ, Hants, England.
[Llobet, Anna; Proffen, Thomas] Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM 87545 USA.
[Fennie, Craig J.] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA.
RP Shoemaker, DP (reprint author), Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA.
EM dshoe@mrl.ucsb.edu
RI Hector, Andrew/B-8344-2009; Llobet, Anna/B-1672-2010; Lujan Center,
LANL/G-4896-2012; Seshadri, Ram/C-4205-2013; Proffen, Thomas/B-3585-2009
OI Hector, Andrew/0000-0002-9964-2163; Seshadri, Ram/0000-0001-5858-4027;
Proffen, Thomas/0000-0002-1408-6031
FU National Science Foundation [DMR 0449354]; MRSEC [DMR 0520415]; DOE
[DE-AC52-06NA25396]
FX We thank M. Pinsky and D. Avnir for providing the CSM script, and we
thank K. L. Page, R. L. Withers, M. G. Tucker, and A. L. Goodwin for
helpful discussions. This work was supported by the Institute for
Multiscale Materials Studies and the National Science Foundation through
a Career Award No. DMR 0449354, to R. S. and MRSEC facilities (Grant No.
DMR 0520415). Neutron scattering was performed on NPDF at the Lujan
Center at the Los Alamos Neutron Science Center, funded by the DOE
Office of Basic Energy Sciences. Los Alamos National Laboratory is
operated by Los Alamos National Security, LLC under DOE under Contract
No. DE-AC52-06NA25396.
NR 57
TC 31
Z9 31
U1 0
U2 24
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144113
DI 10.1103/PhysRevB.81.144113
PG 9
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200043
ER
PT J
AU Springell, R
Langridge, S
Wildes, A
Wilkins, SB
Sanchez-Hanke, C
Moore, KT
Butterfield, MT
Chivall, J
Ward, RCC
Wells, MR
Lander, GH
AF Springell, R.
Langridge, S.
Wildes, A.
Wilkins, S. B.
Sanchez-Hanke, C.
Moore, K. T.
Butterfield, M. T.
Chivall, J.
Ward, R. C. C.
Wells, M. R.
Lander, G. H.
TI Chemical and magnetic structure of uranium/gadolinium multilayers
studied by transmission electron microscopy, neutron scattering, and
x-ray reflectivity
SO PHYSICAL REVIEW B
LA English
DT Article
ID TOTAL EXTERNAL REFLECTION; ROUGHNESS CORRELATIONS; INTERFACIAL
ROUGHNESS; DIFFUSE-SCATTERING; DIFFRACTION; SURFACES; SUPERLATTICES;
REFLECTOMETRY; SPINTRONICS; INJECTION
AB We present a multitechnique approach to study the detailed chemical and magnetic structure of uranium/gadolinium multilayers. At low temperature the saturation magnetization is found to be similar to 60% of that of bulk gadolinium. We address this problem, which is found in many other multilayers and suggest a model that may have wider applications. transmission electron microscopy images indicate a microstructure, consistent with a columnar growth of Gd with crystallites of the order 20 -> 100 angstrom. Off-specular neutron scattering is most strongly visible at saturation field, indicating that Gd moments are not aligned with the applied field. X-ray resonant magnetic scattering provides proof of coupled in-plane length scales for both the structural and the magnetic roughness. A detailed x-ray scattering study of both the specular and off-specular reflectivities has been used to investigate the in-plane structure of the multilayers. We calculate the roughness and transverse correlation cut-off length, xi(x) = 120 +/- 30 angstrom, and present a simple model to determine an average column size of 27 +/- 6 angstrom and a reduction in the magnetic saturation of similar to 40%.
C1 [Springell, R.] European Synchrotron Radiat Facil, F-38043 Grenoble, France.
[Springell, R.; Chivall, J.] UCL, Dept Phys & Astron, London WC1E 6BT, England.
[Langridge, S.] Rutherford Appleton Lab, ISIS, Didcot OX11 0QX, Oxon, England.
[Wildes, A.] Inst Laue Langevin, F-38042 Grenoble 9, France.
[Wilkins, S. B.; Sanchez-Hanke, C.] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA.
[Moore, K. T.; Butterfield, M. T.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
[Ward, R. C. C.; Wells, M. R.] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England.
[Lander, G. H.] Inst Transuranium Elements, JRC, European Commiss, D-76125 Karlsruhe, Germany.
RP Springell, R (reprint author), European Synchrotron Radiat Facil, BP 220, F-38043 Grenoble, France.
EM ross.springell@ucl.ac.uk
OI Langridge, Sean/0000-0003-1104-0772
FU ITU; JRC Karlsruhe
FX J. Chivall would like to thank the EPSRC, U.K. Our group would like to
thank the Atomic Weapons Establishment (AWE), U.K. for providing the
depleted U target and ITU, JRC Karlsruhe for financial assistance. We
also owe our gratitude to R. A. Cowley, W. G. Stirling, and S. W.
Zochowski for useful discussions.
NR 62
TC 3
Z9 3
U1 0
U2 8
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134434
DI 10.1103/PhysRevB.81.134434
PG 13
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900069
ER
PT J
AU Stock, C
Van Eijck, L
Fouquet, P
Maccarini, M
Gehring, PM
Xu, GY
Luo, H
Zhao, X
Li, JF
Viehland, D
AF Stock, C.
Van Eijck, L.
Fouquet, P.
Maccarini, M.
Gehring, P. M.
Xu, Guangyong
Luo, H.
Zhao, X.
Li, J. -F.
Viehland, D.
TI Interplay between static and dynamic polar correlations in relaxor
Pb(Mg1/3Nb2/3)O-3
SO PHYSICAL REVIEW B
LA English
DT Article
ID SINGLE-CRYSTALS; FERROELECTRIC PBMG1/3NB2/3O3; NEUTRON-SCATTERING;
DIFFUSE-SCATTERING; PHASE-TRANSITIONS; CENTRAL-PEAK; BEHAVIOR; SOFT;
MODE
AB We have characterized the dynamics of the polar nanoregions in Pb(Mg1/3Nb2/3)O-3 through high-resolution neutron-backscattering and spin-echo measurements of the diffuse-scattering cross section. We find that the diffuse-scattering intensity consists of both static and dynamic components. The static component first appears at the Curie temperature Theta similar to 400 K while the dynamic component freezes completely at the temperature T-f similar to 200 K; together, these components account for all of the observed spectral weight contributing to the diffuse-scattering cross section. The integrated intensity of the dynamic component peaks near the temperature at which the frequency-dependent dielectric constant reaches a maximum (T-max) when measured at 1 GHz, i.e., on a time scale of similar to 1 ns. Our neutron-scattering results can thus be directly related to dielectric and infrared measurements of the polar nanoregions. Finally, the global temperature dependence of the diffuse scattering can be understood in terms of just two temperature scales, which is consistent with random-field models.
C1 [Stock, C.] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England.
[Van Eijck, L.; Fouquet, P.; Maccarini, M.] Inst Laue Langevin, F-38042 Grenoble 9, France.
[Gehring, P. M.] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA.
[Xu, Guangyong] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
[Luo, H.; Zhao, X.] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201800, Peoples R China.
[Li, J. -F.; Viehland, D.] Virginia Tech, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA.
RP Stock, C (reprint author), Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England.
RI Fouquet, Peter/B-5212-2008; Xu, Guangyong/A-8707-2010; Zhao,
Xiangyong/A-1743-2013; Maccarini, Marco/A-1894-2015;
OI Fouquet, Peter/0000-0002-5542-0059; Xu, Guangyong/0000-0003-1441-8275;
Maccarini, Marco/0000-0002-4555-3288; Gehring, Peter/0000-0002-9236-2046
NR 52
TC 33
Z9 33
U1 4
U2 33
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144127
DI 10.1103/PhysRevB.81.144127
PG 7
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200057
ER
PT J
AU Takagi, S
Subedi, A
Singh, DJ
Cooper, VR
AF Takagi, Shigeyuki
Subedi, Alaska
Singh, David J.
Cooper, Valentino R.
TI Polar behavior of the double perovskites BiMZnNbO6 (M=Pb and Sr) from
density-functional calculations
SO PHYSICAL REVIEW B
LA English
DT Article
ID MORPHOTROPIC PHASE-BOUNDARY; HIGH-TEMPERATURE; POLARIZATION ROTATION;
STABILITY; CERAMICS; PIEZOELECTRICS; INSTABILITIES; ORIGIN; SYSTEM
AB The polar behavior of double perovskite BiPbZnNbO6 and BiSrZnNbO6 was investigated using first-principles density-functional calculations within the local-density approximation. These materials have both A-site size disorder and ions with stereochemical activity. We found a strong ferroelectric distortion in both materials. The polarization of the Pb material is >80 mu C/cm(2) along the rhombohedral direction and the Sr-based material is only slightly inferior. The high polarization results mainly from a large off-centering of Bi and the large Born effective charge of Nb, which yields a large contribution to the polarization although the Nb off-centers by a smaller amount. Neither of these materials favors a tetragonal state, and therefore solid solutions with PbTiO3 may show morphotropic phase boundaries.
C1 [Takagi, Shigeyuki; Subedi, Alaska; Singh, David J.; Cooper, Valentino R.] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA.
[Takagi, Shigeyuki; Subedi, Alaska] Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA.
RP Takagi, S (reprint author), Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA.
RI Singh, David/I-2416-2012; Cooper, Valentino /A-2070-2012; Takagi,
Shigeyuki/D-1301-2013
OI Cooper, Valentino /0000-0001-6714-4410; Takagi,
Shigeyuki/0000-0002-8434-7946
FU Division of Materials Sciences and Engineering, Office of Basic Energy
Sciences, U.S. Department of Energy; Office of Naval Research
FX We are grateful for helpful discussions with M. Fornari and M. H. Du.
This work was supported by the Division of Materials Sciences and
Engineering, Office of Basic Energy Sciences, U.S. Department of Energy
(A.S., V.R.C., D.J.S.) and the Office of Naval Research (S.T., D.J.S.).
NR 46
TC 11
Z9 11
U1 2
U2 14
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134106
DI 10.1103/PhysRevB.81.134106
PG 7
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900022
ER
PT J
AU Tian, W
Christianson, AD
Zarestky, JL
Jia, S
Bud'ko, SL
Canfield, PC
Piccoli, PMB
Schultz, AJ
AF Tian, W.
Christianson, A. D.
Zarestky, J. L.
Jia, S.
Bud'ko, S. L.
Canfield, P. C.
Piccoli, P. M. B.
Schultz, A. J.
TI Magnetic order in TbCo2Zn20 and TbFe2Zn20
SO PHYSICAL REVIEW B
LA English
DT Article
ID CECR2AL20; RH; RU; CO
AB We report neutron diffraction studies of TbCo2Zn20 and TbFe2Zn20, two isostructural compounds which exhibit dramatically different magnetic behavior. In the case of TbCo2Zn20, magnetic Bragg peaks corresponding to antiferromagnetic order are observed below T-N approximate to 2.5 K with a propagation vector of (0.5 0.5 0.5). On the other hand, TbFe2Zn20 undergoes a ferromagnetic transition at temperatures as high as 66 K which shows a high sensitivity to sample-to-sample variations. Two samples of TbFe2Zn20 with the same nominal compositions but with substantially different magnetic ordering temperatures (T-c approximate to 51 and 66 K) were measured by single-crystal neutron diffraction. Structural refinements of the neutron diffraction data find no direct signature of atomic site disorder between the two TbFe2Zn20 samples except for subtle differences in the anisotropic thermal parameters. The differences in the anisotropic thermal parameters between the two samples are likely due to very small amounts of disorder. This provides further evidence for the extreme sensitivity of the magnetic properties of TbFe2Zn20 to small sample variations, even small amounts of disorder.
C1 [Tian, W.; Zarestky, J. L.; Jia, S.; Bud'ko, S. L.; Canfield, P. C.] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
[Tian, W.; Zarestky, J. L.; Jia, S.; Bud'ko, S. L.; Canfield, P. C.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Christianson, A. D.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
[Piccoli, P. M. B.; Schultz, A. J.] Argonne Natl Lab, Argonne, IL 60439 USA.
RP Tian, W (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
RI Tian, Wei/C-8604-2013; Canfield, Paul/H-2698-2014; christianson,
andrew/A-3277-2016
OI Tian, Wei/0000-0001-7735-3187; christianson, andrew/0000-0003-3369-5884
FU U.S. Department of Energy [DE-AC02-07CH111358]; Scientific User Facility
Division, Office of Basic Energy Science, DOE; U.S. Department of
Energy, Office of Science, Office of Basic Energy Sciences
[DE-AC02-06CH11357]
FX We would like to thank V.O. Garlea for helping with the
TbCo2Zn20 magnetic structure refinement. Ames
Laboratory is operated for the U.S. Department of Energy by Iowa State
University under Contract No. DE-AC02-07CH111358. Work at ORNL was
supported by the Scientific User Facility Division, Office of Basic
Energy Science, DOE. Work at Argonne National Laboratory was supported
by the U.S. Department of Energy, Office of Science, Office of Basic
Energy Sciences, under Contract No. DE-AC02-06CH11357.
NR 25
TC 15
Z9 15
U1 0
U2 14
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144409
DI 10.1103/PhysRevB.81.144409
PG 7
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200073
ER
PT J
AU Wang, XY
Daghofer, M
Nicholson, A
Moreo, A
Guidry, M
Dagotto, E
AF Wang, Xiaoyu
Daghofer, Maria
Nicholson, Andrew
Moreo, Adriana
Guidry, Michael
Dagotto, Elbio
TI Constraints imposed by symmetry on pairing operators for the iron
pnictides
SO PHYSICAL REVIEW B
LA English
DT Article
ID HIGH-TEMPERATURE SUPERCONDUCTORS; LAYERED QUATERNARY COMPOUND;
PHASE-DIAGRAM; ENERGY-BANDS; BA0.6K0.4FE2AS2; SPECTROSCOPY; INSTABILITY;
GAPS
AB Considering model Hamiltonians that respect the symmetry properties of the pnictides, it is argued that pairing interactions that couple electrons in different orbitals with an orbital-dependent pairing strength inevitably lead to interband pairing matrix elements, at least in some regions of the Brillouin zone. Such interband pairing has not been considered of relevance in multiorbital systems in previous investigations. It is also observed that if, instead, a purely intraband pairing interaction is postulated, this requires that the pairing operator has the form Delta dagger(k) = f(k)Sigma(alpha)d(k,alpha dagger)(dagger)d(-k,alpha,down arrow)(dagger). where alpha labels the orbitals considered in the model and f(k) arises from the spatial location of the coupled electrons or holes. This means that the gaps at two different Fermi surfaces involving momenta k(F) and k'(F) can only differ by the ratio f(k(F))/f(k'(F)) and that electrons in different orbitals must be subject to the same pairing attraction, thus, requiring fine tuning. These results suggest that previously neglected interband pairing tendencies could actually be of relevance in a microscopic description of the pairing mechanism in the pnictides.
C1 [Wang, Xiaoyu; Daghofer, Maria; Nicholson, Andrew; Moreo, Adriana; Guidry, Michael; Dagotto, Elbio] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
[Wang, Xiaoyu; Daghofer, Maria; Nicholson, Andrew; Moreo, Adriana; Guidry, Michael; Dagotto, Elbio] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Wang, Xiaoyu] Shanghai Jiao Tong Univ, Dept Elect Commun & Engn, Shanghai 200240, Peoples R China.
[Daghofer, Maria] IFW Dresden, D-01171 Dresden, Germany.
RP Wang, XY (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
RI Daghofer, Maria/C-5762-2008
OI Daghofer, Maria/0000-0001-9434-8937
FU National Science Foundation [DMR-0706020]; Division of Materials
Sciences and Engineering, Office of Basic Energy Sciences, U.S.
Department of Energy; DFG under the Emmy-Noether program
FX This work was supported by the National Science Foundation Grant No.
DMR-0706020 and by the Division of Materials Sciences and Engineering,
Office of Basic Energy Sciences, U.S. Department of Energy. M. D.
acknowledges partial support from the DFG under the Emmy-Noether
program.
NR 66
TC 5
Z9 5
U1 0
U2 4
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144509
DI 10.1103/PhysRevB.81.144509
PG 11
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200105
ER
PT J
AU Wee, SH
Goyal, A
Specht, ED
Cantoni, C
Zuev, YL
Selvamanickam, V
Cook, S
AF Wee, Sung Hun
Goyal, Amit
Specht, Eliot D.
Cantoni, Claudia
Zuev, Yuri L.
Selvamanickam, V.
Cook, Sy
TI Enhanced flux pinning and critical current density via incorporation of
self-assembled rare-earth barium tantalate nanocolumns within
YBa2Cu3O7-delta films
SO PHYSICAL REVIEW B
LA English
DT Article
ID COLUMNAR DEFECTS; SUPERCONDUCTOR; NANODOTS
AB We report rare-earth barium tantalates, Ba2RETaO6 (BRETO, RE=rare earth elements) as promising pinning additives for superior flux pinning in YBa2Cu3O7-delta (YBCO) films. BRETO compounds have excellent chemical inertness to and large lattice mismatch with YBCO. This results in phase separation and strain minimization driven self-assembly of BRETO nanocolumns within YBCO films. YBCO+4 vol % Ba2GdTaO6 films show similar T-c to that of an undoped film of similar to 88.3 K, a higher self- field J(c) of 3.8 MA/cm(2) at 77 K, and improved in-field J(c) higher by a factor of 1.5-6 over entire magnetic field and angular ranges.
C1 [Wee, Sung Hun; Goyal, Amit; Specht, Eliot D.; Cantoni, Claudia; Zuev, Yuri L.; Cook, Sy] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Wee, Sung Hun] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
[Zuev, Yuri L.] Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA.
[Selvamanickam, V.] Univ Houston, Dept Mech Engn, Houston, TX 77204 USA.
RP Wee, SH (reprint author), Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
RI Specht, Eliot/A-5654-2009; Cantoni, Claudia/G-3031-2013
OI Specht, Eliot/0000-0002-3191-2163; Cantoni, Claudia/0000-0002-9731-2021
FU U.S. DOE Office of Electricity Delivery and Energy Reliability-Advanced
Cables and Conductors [DE-AC05-00OR22725]
FX We would like to thank Cliffard C. Davisson for preparing the
YBCO+Ba2RETaO6 targets by powder mixing,
compaction, and sintering. A. Goyal would like to thank SuperPower Inc.
for providing the Hastelloy substrates with the multilayer configuration
of IBAD MgO layer/Homoepitaxial MgO layer/Epitaxial LaMnO3.
This research was sponsored by the U.S. DOE Office of Electricity
Delivery and Energy Reliability-Advanced Cables and Conductors under
Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC managing contractor
for Oak Ridge National Laboratory.
NR 17
TC 24
Z9 24
U1 1
U2 16
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 140503
DI 10.1103/PhysRevB.81.140503
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200022
ER
PT J
AU Wei, F
Chen, F
Sasmal, K
Lv, B
Tang, ZJ
Xue, YY
Guloy, AM
Chu, CW
AF Wei, F.
Chen, F.
Sasmal, K.
Lv, B.
Tang, Z. J.
Xue, Y. Y.
Guloy, A. M.
Chu, C. W.
TI Evidence for multiple gaps in the specific heat of LiFeAs crystals
SO PHYSICAL REVIEW B
LA English
DT Article
AB The zero-field specific heat of LiFeAs was measured on several single crystals selected from a bulk sample. A sharp Delta C(p)/T(c) anomaly approximate to 20 mJ/mole K(2) was observed. The value appears to be between those of SmFeAs(O(0.9)F(0.1)) and (Ba(0.6)K(0.4))Fe(2)As(2) but bears no clear correlation with their Sommerfeld coefficients. The electronic specific heat below T(c) further reveals a two-gap structure with the narrower one only on the order of 0.7 meV. While the results are in rough agreement with the H(c1)(T) previously reported on both LiFeAs and (Ba(0.6)K(0.4))Fe(2)As(2), they are different from the published specific-heat data of a (Ba(0.6)K(0.4))Fe(2)As(2) single crystal.
C1 [Wei, F.; Chen, F.; Sasmal, K.; Xue, Y. Y.; Chu, C. W.] Univ Houston, Dept Phys, Houston, TX 77204 USA.
[Wei, F.; Chen, F.; Sasmal, K.; Lv, B.; Tang, Z. J.; Xue, Y. Y.; Guloy, A. M.; Chu, C. W.] Univ Houston, TCSUH, Houston, TX 77204 USA.
[Lv, B.; Tang, Z. J.; Guloy, A. M.] Univ Houston, Dept Chem, Houston, TX 77204 USA.
[Chu, C. W.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Chu, C. W.] Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China.
RP Wei, F (reprint author), Univ Houston, Dept Phys, Houston, TX 77204 USA.
RI Lv, Bing/E-3485-2010
FU U.S. Air Force Office of Scientific Research; T. L. L. Temple
Foundation; John J. and Rebecca Moores Endowment; Robert A. Welch
Foundation [E-1297]; State of Texas through the Texas Center for
Superconductivity at the University of Houston; U.S. Department of
Energy [DE-AC03-76SF00098]
FX The work in Houston is supported in part by the U.S. Air Force Office of
Scientific Research, the T. L. L. Temple Foundation, the John J. and
Rebecca Moores Endowment, the Robert A. Welch Foundation (under Grant
No. E-1297), and the State of Texas through the Texas Center for
Superconductivity at the University of Houston; and at Lawrence Berkeley
Laboratory by the Director, Office of Science, Office of Basic Energy
Sciences, Division of Materials Sciences and Engineering of the U.S.
Department of Energy under Contract No. DE-AC03-76SF00098.
NR 22
TC 36
Z9 36
U1 0
U2 14
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 13
AR 134527
DI 10.1103/PhysRevB.81.134527
PG 6
WC Physics, Condensed Matter
SC Physics
GA 590ES
UT WOS:000277207900102
ER
PT J
AU Wen, JS
Xu, GY
Gu, GD
Shapiro, SM
AF Wen, Jinsheng
Xu, Guangyong
Gu, Genda
Shapiro, S. M.
TI Robust charge and magnetic orders under electric field and current in
multiferroic LuFe2O4
SO PHYSICAL REVIEW B
LA English
DT Article
ID DIELECTRIC-BREAKDOWN; ROOM-TEMPERATURE; SYSTEM LUFE2O4; DENSITY-WAVE
AB We performed elastic neutron-scattering measurements on the charge and magnetically ordered multiferroic material LuFe2O4. An external electric field along the [001] direction with strength up to 20 kV/cm applied at low temperature (similar to 100 K) does not affect either the charge or magnetic structure. At higher temperatures (similar to 360 K), before the transition to three-dimensional charge-ordered state, the resistivity of the sample is low, and an electric current was applied instead. A reduction in the charge and magnetic peak intensities occurs when the sample is cooled under a constant electric current. However, after calibrating the real sample temperature using its own resistance-temperature curve, we show that the actual sample temperature is higher than the thermometer readings, and the "intensity reduction" is entirely due to internal sample heating by the applied current. Our results suggest that the charge and magnetic orders in LuFe2O4 are unaffected by the application of external electric field and current, and previously observed electric-field and current effects can be naturally explained by internal sample heating.
C1 [Wen, Jinsheng; Xu, Guangyong; Gu, Genda; Shapiro, S. M.] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
[Wen, Jinsheng] SUNY Stony Brook, Dept Mat Sci & Engn, Stony Brook, NY 11794 USA.
RP Wen, JS (reprint author), Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
RI Wen, Jinsheng/F-4209-2010; Xu, Guangyong/A-8707-2010
OI Wen, Jinsheng/0000-0001-5864-1466; Xu, Guangyong/0000-0003-1441-8275
FU U.S. Department of Energy [DE-AC02-98CH20886]
FX We thank W. Ratcliff and M. Hucker for helpful discussions. Work at
Brookhaven National Laboratory is supported by U.S. Department of Energy
under Contract No. DE-AC02-98CH20886.
NR 28
TC 18
Z9 18
U1 0
U2 16
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144121
DI 10.1103/PhysRevB.81.144121
PG 4
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200051
ER
PT J
AU Zheng, JC
Frenkel, AI
Wu, L
Hanson, J
Ku, W
Bozin, ES
Billinge, SJL
Zhu, YM
AF Zheng, Jin-Cheng
Frenkel, A. I.
Wu, L.
Hanson, J.
Ku, W.
Bozin, E. S.
Billinge, S. J. L.
Zhu, Yimei
TI Nanoscale disorder and local electronic properties of CaCu3Ti4O12: An
integrated study of electron, neutron, and x-ray diffraction, x-ray
absorption fine structure, and first-principles calculations
SO PHYSICAL REVIEW B
LA English
DT Article
ID HIGH-DIELECTRIC-CONSTANT; CHARGE-TRANSFER; SCATTERING; ORDER;
PEROVSKITES; CRYSTALS; ACCURATE; DENSITIES; SPECTRA; GAS
AB We report a combined experimental and theoretical study of CaCu3Ti4O12. Based on our experimental observations of nanoscale regions of Ca-Cu antisite defects in part of the structure, we carried out density-functional theory (DFT) calculations that suggest a possible electronic mechanism to explain the gigantic dielectric response in this material. The defects are evident in atomically resolved transmission electron microscopy measurements, with supporting evidence from a quantitative analysis of the electron diffraction and DFT which suggests that such defects are reasonable on energetic grounds. To establish the extent of the defects, bulk average measurements of the local structure were carried out: extended x-ray absorption fine structure (EXAFS), atomic pair-distribution function analysis of neutron powder-diffraction data, and single-crystal x-ray crystallography. The EXAFS data are consistent with the presence of the nanoclustered defects with an estimate of less than 10% of the sample being disordered while the neutron powder-diffraction experiments place an upper of similar to 5% on the proportion of the sample in the defective state. Because of the difficulty of quantifying nanoscale defects at such low levels, further work will be required to establish that this mechanism is operative in CaCu3Ti4O12 but it presents a nontraditional plausible avenue for understanding colossal dielectric behavior.
C1 [Zheng, Jin-Cheng; Wu, L.; Hanson, J.; Ku, W.; Bozin, E. S.; Billinge, S. J. L.; Zhu, Yimei] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA.
[Frenkel, A. I.] Yeshiva Univ, Dept Phys, New York, NY 10016 USA.
[Bozin, E. S.; Billinge, S. J. L.] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
RP Zhu, YM (reprint author), Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA.
EM zhu@bnl.gov
RI Zheng, JC/G-3383-2010; Frenkel, Anatoly/D-3311-2011; Bozin,
Emil/E-4679-2011; Hanson, jonathan/E-3517-2010
OI Zheng, JC/0000-0002-6292-3236; Frenkel, Anatoly/0000-0002-5451-1207;
FU U.S. Department of Energy, Office of Basic Energy Science
[DE-FG02-03ER15476, DE-AC02-98CH10886]; DOE-CMSN
FX We thank Morrel H. Cohen, David Vanderbilt, Weiguo Yin, and Peter
Stephens for stimulating discussions. A. I. F. acknowledges support by
the U.S. Department of Energy, Office of Basic Energy Science, Grant No.
DE-FG02-03ER15476. Work at Brookhaven was supported by the U.S.
Department of Energy, Office of Basic Energy Science, under Contract No.
DE-AC02-98CH10886 and DOE-CMSN.
NR 67
TC 24
Z9 24
U1 2
U2 34
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-0121
EI 1550-235X
J9 PHYS REV B
JI Phys. Rev. B
PD APR 1
PY 2010
VL 81
IS 14
AR 144203
DI 10.1103/PhysRevB.81.144203
PG 19
WC Physics, Condensed Matter
SC Physics
GA 590FN
UT WOS:000277210200061
ER
PT J
AU Abelev, BI
Aggarwal, MM
Ahammed, Z
Alakhverdyants, AV
Alekseev, I
Anderson, BD
Arkhipkin, D
Averichev, GS
Balewski, J
Barnby, LS
Baumgart, S
Beavis, DR
Bellwied, R
Betancourt, MJ
Betts, RR
Bhasin, A
Bhati, AK
Bichsel, H
Bielcik, J
Bielcikova, J
Biritz, B
Bland, LC
Bonner, BE
Bouchet, J
Braidot, E
Brandin, AV
Bridgeman, A
Bruna, E
Bueltmann, S
Bunzarov, I
Burton, TP
Cai, XZ
Caines, H
Sanchez, MCD
Catu, O
Cebra, D
Cendejas, R
Cervantes, MC
Chajecki, Z
Chaloupka, P
Chattopadhyay, S
Chen, HF
Chen, JH
Chen, JY
Cheng, J
Cherney, M
Chikanian, A
Choi, KE
Christie, W
Chung, P
Clarke, RF
Codrington, MJM
Corliss, R
Cramer, JG
Crawford, HJ
Das, D
Dash, S
Leyva, AD
De Silva, LC
Debbe, RR
Dedovich, TG
DePhillips, M
Derevschikov, AA
de Souza, RD
Didenko, L
Djawotho, P
Dogra, SM
Dong, X
Drachenberg, JL
Draper, JE
Dunlop, JC
Mazumdar, MRD
Efimov, LG
Elhalhuli, E
Elnimr, M
Engelage, J
Eppley, G
Erazmus, B
Estienne, M
Eun, L
Evdokimov, O
Fachini, P
Fatemi, R
Fedorisin, J
Fersch, RG
Filip, P
Finch, E
Fine, V
Fisyak, Y
Gagliardi, CA
Gangadharan, DR
Ganti, MS
Garcia-Solis, EJ
Geromitsos, A
Geurts, F
Ghazikhanian, V
Ghosh, P
Gorbunov, YN
Gordon, A
Grebenyuk, O
Grosnick, D
Grube, B
Guertin, SM
Gupta, A
Gupta, N
Guryn, W
Haag, B
Hamed, A
Han, LX
Harris, JW
Hays-Wehle, JP
Heinz, M
Heppelmann, S
Hirsch, A
Hjort, E
Hoffman, AM
Hoffmann, GW
Hofman, DJ
Hollis, RS
Huang, HZ
Humanic, TJ
Huo, L
Igo, G
Iordanova, A
Jacobs, P
Jacobs, WW
Jakl, P
Jena, C
Jin, F
Jones, CL
Jones, PG
Joseph, J
Judd, EG
Kabana, S
Kajimoto, K
Kang, K
Kapitan, J
Kauder, K
Keane, D
Kechechyan, A
Kettler, D
Kikola, DP
Kiryluk, J
Kisiel, A
Klein, SR
Knospe, AG
Kocoloski, A
Koetke, DD
Kollegger, T
Konzer, J
Kopytine, M
Koralt, I
Koroleva, L
Korsch, W
Kotchenda, L
Kouchpil, V
Kravtsov, P
Krueger, K
Krus, M
Kumar, L
Kurnadi, P
Lamont, MAC
Landgraf, JM
LaPointe, S
Lauret, J
Lebedev, A
Lednicky, R
Lee, CH
Lee, JH
Leight, W
LeVine, MJ
Li, C
Li, L
Li, N
Li, W
Li, X
Li, X
Li, Y
Li, Z
Lin, G
Lindenbaum, SJ
Lisa, MA
Liu, F
Liu, H
Liu, J
Ljubicic, T
Llope, WJ
Longacre, RS
Love, WA
Lu, Y
Ma, GL
Ma, YG
Mahapatra, DP
Majka, R
Mall, OI
Mangotra, LK
Manweiler, R
Margetis, S
Markert, C
Masui, H
Matis, HS
Matulenko, YA
McDonald, D
McShane, TS
Meschanin, A
Milner, R
Minaev, NG
Mioduszewski, S
Mischke, A
Mitrovski, MK
Mohanty, B
Mondal, MM
Morozov, B
Morozov, DA
Munhoz, MG
Nandi, BK
Nattrass, C
Nayak, TK
Nelson, JM
Netrakanti, PK
Ng, MJ
Nogach, LV
Nurushev, SB
Odyniec, G
Ogawa, A
Okada, H
Okorokov, V
Olson, D
Pachr, M
Page, BS
Pal, SK
Pandit, Y
Panebratsev, Y
Pawlak, T
Peitzmann, T
Perevoztchikov, V
Perkins, C
Peryt, W
Phatak, SC
Pile, P
Planinic, M
Ploskon, MA
Pluta, J
Plyku, D
Poljak, N
Poskanzer, AM
Potukuchi, BVKS
Powell, CB
Prindle, D
Pruneau, C
Pruthi, NK
Pujahari, PR
Putschke, J
Raniwala, R
Raniwala, S
Ray, RL
Redwine, R
Reed, R
Rehberg, JM
Ritter, HG
Roberts, JB
Rogachevskiy, OV
Romero, JL
Rose, A
Roy, C
Ruan, L
Sahoo, R
Sakai, S
Sakrejda, I
Sakuma, T
Salur, S
Sandweiss, J
Sangaline, E
Schambach, J
Scharenberg, RP
Schmitz, N
Schuster, TR
Seele, J
Seger, J
Selyuzhenkov, I
Seyboth, P
Shahaliev, E
Shao, M
Sharma, M
Shi, SS
Shi, XH
Sichtermann, EP
Simon, F
Singaraju, RN
Skoby, MJ
Smirnov, N
Sorensen, P
Sowinski, J
Spinka, HM
Srivastava, B
Stanislaus, TDS
Staszak, D
Stevens, JR
Stock, R
Strikhanov, M
Stringfellow, B
Suaide, AAP
Suarez, MC
Subba, NL
Sumbera, M
Sun, XM
Sun, Y
Sun, Z
Surrow, B
Svirida, DN
Symons, TJM
de Toledo, AS
Takahashi, J
Tang, AH
Tang, Z
Tarini, LH
Tarnowsky, T
Thein, D
Thomas, JH
Tian, J
Timmins, AR
Timoshenko, S
Tlusty, D
Tokarev, M
Tram, VN
Trentalange, S
Tribble, RE
Tsai, OD
Ulery, J
Ullrich, T
Underwood, DG
Van Buren, G
van Leeuwen, M
van Nieuwenhuizen, G
Vanfossen, JA
Varma, R
Vasconcelos, GMS
Vasiliev, AN
Videbaek, F
Viyogi, YP
Vokal, S
Voloshin, SA
Wada, M
Walker, M
Wang, F
Wang, G
Wang, H
Wang, JS
Wang, Q
Wang, XL
Wang, Y
Webb, G
Webb, JC
Westfall, GD
Whitten, C
Wieman, H
Wingfield, E
Wissink, SW
Witt, R
Wu, Y
Xie, W
Xu, N
Xu, QH
Xu, W
Xu, Y
Xu, Z
Xue, L
Yang, Y
Yepes, P
Yip, K
Yoo, IK
Yue, Q
Zawisza, M
Zbroszczyk, H
Zhan, W
Zhang, S
Zhang, WM
Zhang, XP
Zhang, Y
Zhang, ZP
Zhao, J
Zhong, C
Zhou, J
Zhou, W
Zhu, X
Zhu, YH
Zoulkarneev, R
Zoulkarneeva, Y
AF Abelev, B. I.
Aggarwal, M. M.
Ahammed, Z.
Alakhverdyants, A. V.
Alekseev, I.
Anderson, B. D.
Arkhipkin, D.
Averichev, G. S.
Balewski, J.
Barnby, L. S.
Baumgart, S.
Beavis, D. R.
Bellwied, R.
Betancourt, M. J.
Betts, R. R.
Bhasin, A.
Bhati, A. K.
Bichsel, H.
Bielcik, J.
Bielcikova, J.
Biritz, B.
Bland, L. C.
Bonner, B. E.
Bouchet, J.
Braidot, E.
Brandin, A. V.
Bridgeman, A.
Bruna, E.
Bueltmann, S.
Bunzarov, I.
Burton, T. P.
Cai, X. Z.
Caines, H.
Sanchez, M. Calderon de la Barca
Catu, O.
Cebra, D.
Cendejas, R.
Cervantes, M. C.
Chajecki, Z.
Chaloupka, P.
Chattopadhyay, S.
Chen, H. F.
Chen, J. H.
Chen, J. Y.
Cheng, J.
Cherney, M.
Chikanian, A.
Choi, K. E.
Christie, W.
Chung, P.
Clarke, R. F.
Codrington, M. J. M.
Corliss, R.
Cramer, J. G.
Crawford, H. J.
Das, D.
Dash, S.
Leyva, A. Davila
De Silva, L. C.
Debbe, R. R.
Dedovich, T. G.
DePhillips, M.
Derevschikov, A. A.
de Souza, R. Derradi
Didenko, L.
Djawotho, P.
Dogra, S. M.
Dong, X.
Drachenberg, J. L.
Draper, J. E.
Dunlop, J. C.
Mazumdar, M. R. Dutta
Efimov, L. G.
Elhalhuli, E.
Elnimr, M.
Engelage, J.
Eppley, G.
Erazmus, B.
Estienne, M.
Eun, L.
Evdokimov, O.
Fachini, P.
Fatemi, R.
Fedorisin, J.
Fersch, R. G.
Filip, P.
Finch, E.
Fine, V.
Fisyak, Y.
Gagliardi, C. A.
Gangadharan, D. R.
Ganti, M. S.
Garcia-Solis, E. J.
Geromitsos, A.
Geurts, F.
Ghazikhanian, V.
Ghosh, P.
Gorbunov, Y. N.
Gordon, A.
Grebenyuk, O.
Grosnick, D.
Grube, B.
Guertin, S. M.
Gupta, A.
Gupta, N.
Guryn, W.
Haag, B.
Hamed, A.
Han, L. -X.
Harris, J. W.
Hays-Wehle, J. P.
Heinz, M.
Heppelmann, S.
Hirsch, A.
Hjort, E.
Hoffman, A. M.
Hoffmann, G. W.
Hofman, D. J.
Hollis, R. S.
Huang, H. Z.
Humanic, T. J.
Huo, L.
Igo, G.
Iordanova, A.
Jacobs, P.
Jacobs, W. W.
Jakl, P.
Jena, C.
Jin, F.
Jones, C. L.
Jones, P. G.
Joseph, J.
Judd, E. G.
Kabana, S.
Kajimoto, K.
Kang, K.
Kapitan, J.
Kauder, K.
Keane, D.
Kechechyan, A.
Kettler, D.
Kikola, D. P.
Kiryluk, J.
Kisiel, A.
Klein, S. R.
Knospe, A. G.
Kocoloski, A.
Koetke, D. D.
Kollegger, T.
Konzer, J.
Kopytine, M.
Koralt, I.
Koroleva, L.
Korsch, W.
Kotchenda, L.
Kouchpil, V.
Kravtsov, P.
Krueger, K.
Krus, M.
Kumar, L.
Kurnadi, P.
Lamont, M. A. C.
Landgraf, J. M.
LaPointe, S.
Lauret, J.
Lebedev, A.
Lednicky, R.
Lee, C. -H.
Lee, J. H.
Leight, W.
LeVine, M. J.
Li, C.
Li, L.
Li, N.
Li, W.
Li, X.
Li, X.
Li, Y.
Li, Z.
Lin, G.
Lindenbaum, S. J.
Lisa, M. A.
Liu, F.
Liu, H.
Liu, J.
Ljubicic, T.
Llope, W. J.
Longacre, R. S.
Love, W. A.
Lu, Y.
Ma, G. L.
Ma, Y. G.
Mahapatra, D. P.
Majka, R.
Mall, O. I.
Mangotra, L. K.
Manweiler, R.
Margetis, S.
Markert, C.
Masui, H.
Matis, H. S.
Matulenko, Yu. A.
McDonald, D.
McShane, T. S.
Meschanin, A.
Milner, R.
Minaev, N. G.
Mioduszewski, S.
Mischke, A.
Mitrovski, M. K.
Mohanty, B.
Mondal, M. M.
Morozov, B.
Morozov, D. A.
Munhoz, M. G.
Nandi, B. K.
Nattrass, C.
Nayak, T. K.
Nelson, J. M.
Netrakanti, P. K.
Ng, M. J.
Nogach, L. V.
Nurushev, S. B.
Odyniec, G.
Ogawa, A.
Okada, H.
Okorokov, V.
Olson, D.
Pachr, M.
Page, B. S.
Pal, S. K.
Pandit, Y.
Panebratsev, Y.
Pawlak, T.
Peitzmann, T.
Perevoztchikov, V.
Perkins, C.
Peryt, W.
Phatak, S. C.
Pile, P.
Planinic, M.
Ploskon, M. A.
Pluta, J.
Plyku, D.
Poljak, N.
Poskanzer, A. M.
Potukuchi, B. V. K. S.
Powell, C. B.
Prindle, D.
Pruneau, C.
Pruthi, N. K.
Pujahari, P. R.
Putschke, J.
Raniwala, R.
Raniwala, S.
Ray, R. L.
Redwine, R.
Reed, R.
Rehberg, J. M.
Ritter, H. G.
Roberts, J. B.
Rogachevskiy, O. V.
Romero, J. L.
Rose, A.
Roy, C.
Ruan, L.
Sahoo, R.
Sakai, S.
Sakrejda, I.
Sakuma, T.
Salur, S.
Sandweiss, J.
Sangaline, E.
Schambach, J.
Scharenberg, R. P.
Schmitz, N.
Schuster, T. R.
Seele, J.
Seger, J.
Selyuzhenkov, I.
Seyboth, P.
Shahaliev, E.
Shao, M.
Sharma, M.
Shi, S. S.
Shi, X. H.
Sichtermann, E. P.
Simon, F.
Singaraju, R. N.
Skoby, M. J.
Smirnov, N.
Sorensen, P.
Sowinski, J.
Spinka, H. M.
Srivastava, B.
Stanislaus, T. D. S.
Staszak, D.
Stevens, J. R.
Stock, R.
Strikhanov, M.
Stringfellow, B.
Suaide, A. A. P.
Suarez, M. C.
Subba, N. L.
Sumbera, M.
Sun, X. M.
Sun, Y.
Sun, Z.
Surrow, B.
Svirida, D. N.
Symons, T. J. M.
de Toledo, A. Szanto
Takahashi, J.
Tang, A. H.
Tang, Z.
Tarini, L. H.
Tarnowsky, T.
Thein, D.
Thomas, J. H.
Tian, J.
Timmins, A. R.
Timoshenko, S.
Tlusty, D.
Tokarev, M.
Tram, V. N.
Trentalange, S.
Tribble, R. E.
Tsai, O. D.
Ulery, J.
Ullrich, T.
Underwood, D. G.
Van Buren, G.
van Leeuwen, M.
van Nieuwenhuizen, G.
Vanfossen, J. A., Jr.
Varma, R.
Vasconcelos, G. M. S.
Vasiliev, A. N.
Videbaek, F.
Viyogi, Y. P.
Vokal, S.
Voloshin, S. A.
Wada, M.
Walker, M.
Wang, F.
Wang, G.
Wang, H.
Wang, J. S.
Wang, Q.
Wang, X. L.
Wang, Y.
Webb, G.
Webb, J. C.
Westfall, G. D.
Whitten, C., Jr.
Wieman, H.
Wingfield, E.
Wissink, S. W.
Witt, R.
Wu, Y.
Xie, W.
Xu, N.
Xu, Q. H.
Xu, W.
Xu, Y.
Xu, Z.
Xue, L.
Yang, Y.
Yepes, P.
Yip, K.
Yoo, I. -K.
Yue, Q.
Zawisza, M.
Zbroszczyk, H.
Zhan, W.
Zhang, S.
Zhang, W. M.
Zhang, X. P.
Zhang, Y.
Zhang, Z. P.
Zhao, J.
Zhong, C.
Zhou, J.
Zhou, W.
Zhu, X.
Zhu, Y. H.
Zoulkarneev, R.
Zoulkarneeva, Y.
CA STAR Collaboration
TI Charged and strange hadron elliptic flow in Cu plus Cu collisions at
root s(NN)=62.4 and 200 GeV
SO PHYSICAL REVIEW C
LA English
DT Article
ID QUARK-GLUON PLASMA; HEAVY-ION COLLISIONS; RELATIVISTIC NUCLEAR
COLLISIONS; PHI-MESON PRODUCTION; ANISOTROPIC FLOW; PHASE-TRANSITION;
CENTRALITY DEPENDENCE; SIGNATURE; STAR; COLLABORATION
AB We present the results of an elliptic flow, v(2), analysis of Cu + Cu collisions recorded with the solenoidal tracker detector (STAR) at the BNL Relativistic Heavy Ion Collider at root s(NN) = 62.4 and 200 GeV. Elliptic flow as a function of transverse momentum, v(2)(p(T)), is reported for different collision centralities for charged hadrons h(+/-) and strangeness-ontaining hadrons K-S(0), Lambda, Xi, and phi in the midrapidity region vertical bar eta vertical bar < 1.0. Significant reduction in systematic uncertainty of the measurement due to nonflow effects has been achieved by correlating particles at midrapidity, vertical bar eta vertical bar < 1.0, with those at forward rapidity, 2.5 < vertical bar eta vertical bar < 4.0. We also present azimuthal correlations in p + p collisions at root s = 200 GeV to help in estimating nonflow effects. To study the system-size dependence of elliptic flow, we present a detailed comparison with previously published results from Au + Au collisions at root s(NN) = 200 GeV. We observe that v(2)(p(T)) of strange hadrons has similar scaling properties as were first observed in Au + Au collisions, that is, (i) at low transverse momenta, p(T) < 2 GeV/c, v(2) scales with transverse kinetic energy, m(T) - m, and (ii) at intermediate p(T), 2 < p(T) < 4 GeV/c, it scales with the number of constituent quarks, n(q.) We have found that ideal hydrodynamic calculations fail to reproduce the centrality dependence of v(2)(p(T)) for K-S(0) and Lambda. Eccentricity scaled v(2) values, v(2)/epsilon, are larger in more central collisions, suggesting stronger collective flow develops in more central collisions. The comparison with Au + Au collisions, which go further in density, shows that v(2)/epsilon depends on the system size, that is, the number of participants N-part. This indicates that the ideal hydrodynamic limit is not reached in Cu + Cu collisions, presumably because the assumption of thermalization is not attained.
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[Schmitz, N.; Seyboth, P.; Simon, F.] Max Planck Inst Phys & Astrophys, D-80805 Munich, Germany.
[Tarnowsky, T.; Wang, H.; Westfall, G. D.] Michigan State Univ, E Lansing, MI 48824 USA.
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[Li, X.; Xu, Q. H.; Zbroszczyk, H.; Zhou, W.] Shandong Univ, Jinan 250100, Shandong, Peoples R China.
[Cai, X. Z.; Chen, J. H.; Han, L. -X.; Jin, F.; Li, W.; Ma, G. L.; Ma, Y. G.; Shi, X. H.; Tian, J.; Xue, L.; Zhang, S.; Zhao, J.; Zhong, C.; Zhu, Y. H.] Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
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[Baumgart, S.; Bruna, E.; Caines, H.; Catu, O.; Chikanian, A.; Finch, E.; Harris, J. W.; Heinz, M.; Knospe, A. G.; Lin, G.; Majka, R.; Nattrass, C.; Putschke, J.; Sandweiss, J.; Smirnov, N.] Yale Univ, New Haven, CT 06520 USA.
[Planinic, M.; Poljak, N.] Univ Zagreb, HR-10002 Zagreb, Croatia.
RP Shi, SS (reprint author), CCNU HZNU, Inst Particle Phys, Wuhan 430079, Peoples R China.
EM sss@iopp.ccnu.edu.cn
RI Ma, Yu-Gang/M-8122-2013; Alekseev, Igor/J-8070-2014; Sumbera,
Michal/O-7497-2014; Strikhanov, Mikhail/P-7393-2014; Xu,
Wenqin/H-7553-2014; Dogra, Sunil /B-5330-2013; Chaloupka,
Petr/E-5965-2012; Nattrass, Christine/J-6752-2016; Derradi de Souza,
Rafael/M-4791-2013; Suaide, Alexandre/L-6239-2016; Svirida,
Dmitry/R-4909-2016; Inst. of Physics, Gleb Wataghin/A-9780-2017;
Okorokov, Vitaly/C-4800-2017; Planinic, Mirko/E-8085-2012; Yoo,
In-Kwon/J-6222-2012; Peitzmann, Thomas/K-2206-2012; Witt,
Richard/H-3560-2012; Yip, Kin/D-6860-2013; Xue, Liang/F-8077-2013;
Voloshin, Sergei/I-4122-2013; Pandit, Yadav/I-2170-2013; Lednicky,
Richard/K-4164-2013; Barnby, Lee/G-2135-2010; Mischke,
Andre/D-3614-2011; Takahashi, Jun/B-2946-2012; Yang, Yanyun/B-9485-2014;
Bielcikova, Jana/G-9342-2014
OI Ma, Yu-Gang/0000-0002-0233-9900; Alekseev, Igor/0000-0003-3358-9635;
Sumbera, Michal/0000-0002-0639-7323; Strikhanov,
Mikhail/0000-0003-2586-0405; Xu, Wenqin/0000-0002-5976-4991; Nattrass,
Christine/0000-0002-8768-6468; Derradi de Souza,
Rafael/0000-0002-2084-7001; Suaide, Alexandre/0000-0003-2847-6556;
Okorokov, Vitaly/0000-0002-7162-5345; Peitzmann,
Thomas/0000-0002-7116-899X; Yip, Kin/0000-0002-8576-4311; Xue,
Liang/0000-0002-2321-9019; Pandit, Yadav/0000-0003-2809-7943; Barnby,
Lee/0000-0001-7357-9904; Takahashi, Jun/0000-0002-4091-1779; Yang,
Yanyun/0000-0002-5982-1706;
FU US DOE Office of Science; US NSF; Sloan Foundation; DFG; CNRS
[CNRS/IN2P3]; STFC; EPSRC of the United Kingdom; FAPESP CNPq of Brazil;
Ministry of Education and Science of the Russian Federation; NNSFC; CAS;
MoST; MoE of China; GA and MSMT of the Czech Republic; FOM and NWO of
the Netherlands; DAE; DST; CSIR of India; Polish Ministry of Science and
Higher Education; Korea Research Foundation; Ministry of Science,
Education and Sports of the Republic of Croatia; Russian Ministry of
Science and Technology; RosAtom of Russia
FX We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at
LBNL, and the Open Science Grid consortium for providing resources and
support. This work was supported in part by the Offices of NP and HEP
within the US DOE Office of Science; the US NSF; the Sloan Foundation;
the DFG cluster of excellence "Origin and Structure of the Universe" of
Germany; CNRS/IN2P3, STFC and EPSRC of the United Kingdom; FAPESP CNPq
of Brazil; the Ministry of Education and Science of the Russian
Federation; NNSFC, CAS, MoST, and MoE of China; GA and MSMT of the Czech
Republic; FOM and NWO of the Netherlands; DAE, DST, and CSIR of India;
the Polish Ministry of Science and Higher Education; the Korea Research
Foundation; the Ministry of Science, Education and Sports of the
Republic of Croatia; the Russian Ministry of Science and Technology; and
RosAtom of Russia.
NR 70
TC 40
Z9 40
U1 0
U2 17
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0556-2813
EI 1089-490X
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 044902
DI 10.1103/PhysRevC.81.044902
PG 14
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500057
ER
PT J
AU Abelev, BI
Aggarwal, MM
Ahammed, Z
Alakhverdyants, AV
Anderson, BD
Arkhipkin, D
Averichev, GS
Balewski, J
Barnby, LS
Baumgart, S
Beavis, DR
Bellwied, R
Benedosso, F
Betancourt, MJ
Betts, RR
Bhasin, A
Bhati, AK
Bichsel, H
Bielcik, J
Bielcikova, J
Biritz, B
Bland, LC
Bonner, BE
Bouchet, J
Braidot, E
Brandin, AV
Bridgeman, A
Bruna, E
Bueltmann, S
Bunzarov, I
Burton, TP
Cai, XZ
Caines, H
Sanchez, MCD
Catu, O
Cebra, D
Cendejas, R
Cervantes, MC
Chajecki, Z
Chaloupka, P
Chattopadhyay, S
Chen, HF
Chen, JH
Chen, JY
Cheng, J
Cherney, M
Chikanian, A
Choi, KE
Christie, W
Chung, P
Chung, SU
Clarke, RF
Codrington, MJM
Corliss, R
Cramer, JG
Crawford, HJ
Das, D
Dash, S
Leyva, AD
De Silva, LC
Debbe, RR
Dedovich, TG
DePhillips, M
Derevschikov, AA
de Souza, RD
Didenko, L
Djawotho, P
Dogra, SM
Dong, X
Drachenberg, JL
Draper, JE
Dunlop, JC
Mazumdar, MRD
Efimov, LG
Elhalhuli, E
Elnimr, M
Engelage, J
Eppley, G
Erazmus, B
Estienne, M
Eun, L
Evdokimov, O
Fachini, P
Fatemi, R
Fedorisin, J
Fersch, RG
Filip, P
Finch, E
Fine, V
Fisyak, Y
Gagliardi, CA
Gangadharan, DR
Ganti, MS
Garcia-Solis, EJ
Geromitsos, A
Geurts, F
Ghazikhanian, V
Ghosh, P
Gorbunov, YN
Gordon, A
Grebenyuk, O
Grosnick, D
Grube, B
Guertin, SM
Gupta, A
Gupta, N
Guryn, W
Haag, B
Hallman, TJ
Hamed, A
Han, LX
Harris, JW
Hays-Wehle, JP
Heinz, M
Heppelmann, S
Hirsch, A
Hjort, E
Hoffman, AM
Hoffmann, GW
Hofman, DJ
Hollis, RS
Huang, HZ
Humanic, TJ
Huo, L
Igo, G
Iordanova, A
Jacobs, P
Jacobs, WW
Jakl, P
Jena, C
Jin, F
Jones, CL
Jones, PG
Joseph, J
Judd, EG
Kabana, S
Kajimoto, K
Kang, K
Kapitan, J
Kauder, K
Keane, D
Kechechyan, A
Kettler, D
Kikola, DP
Kiryluk, J
Kisiel, A
Klein, SR
Knospe, AG
Kocoloski, A
Koetke, DD
Kollegger, T
Konzer, J
Kopytine, M
Koralt, I
Korsch, W
Kotchenda, L
Kouchpil, V
Kravtsov, P
Krueger, K
Krus, M
Kumar, L
Kurnadi, P
Lamont, MAC
Landgraf, JM
LaPointe, S
Lauret, J
Lebedev, A
Lednicky, R
Lee, CH
Lee, JH
Leight, W
LeVine, MJ
Li, C
Li, L
Li, N
Li, W
Li, X
Li, X
Li, Y
Li, Z
Lin, G
Lindenbaum, SJ
Lisa, MA
Liu, F
Liu, H
Liu, J
Ljubicic, T
Llope, WJ
Longacre, RS
Love, WA
Lu, Y
Ma, GL
Ma, YG
Mahapatra, DP
Majka, R
Mall, OI
Mangotra, LK
Manweiler, R
Margetis, S
Markert, C
Masui, H
Matis, HS
Matulenko, YA
McDonald, D
McShane, TS
Meschanin, A
Milner, R
Minaev, NG
Mioduszewski, S
Mischke, A
Mitrovski, MK
Mohanty, B
Mondal, MM
Morozov, DA
Munhoz, MG
Nandi, BK
Nattrass, C
Nayak, TK
Nelson, JM
Netrakanti, PK
Ng, MJ
Nogach, LV
Nurushev, SB
Odyniec, G
Ogawa, A
Okada, H
Okorokov, V
Olson, D
Pachr, M
Page, BS
Pal, SK
Pandit, Y
Panebratsev, Y
Pawlak, T
Peitzmann, T
Perevoztchikov, V
Perkins, C
Peryt, W
Phatak, SC
Pile, P
Planinic, M
Ploskon, MA
Pluta, J
Plyku, D
Poljak, N
Poskanzer, AM
Potukuchi, BVKS
Powell, CB
Prindle, D
Pruneau, C
Pruthi, NK
Pujahari, PR
Putschke, J
Raniwala, R
Raniwala, S
Ray, RL
Redwine, R
Reed, R
Rehberg, JM
Ritter, HG
Roberts, JB
Rogachevskiy, OV
Romero, JL
Rose, A
Roy, C
Ruan, L
Russcher, MJ
Sahoo, R
Sakai, S
Sakrejda, I
Sakuma, T
Salur, S
Sandweiss, J
Sangaline, E
Schambach, J
Scharenberg, RP
Schmitz, N
Schuster, TR
Seele, J
Seger, J
Selyuzhenkov, I
Seyboth, P
Shahaliev, E
Shao, M
Sharma, M
Shi, SS
Sichtermann, EP
Simon, F
Singaraju, RN
Skoby, MJ
Smirnov, N
Sorensen, P
Sowinski, J
Spinka, HM
Srivastava, B
Stanislaus, TDS
Staszak, D
Stevens, JR
Stock, R
Strikhanov, M
Stringfellow, B
Suaide, AAP
Suarez, MC
Subba, NL
Sumbera, M
Sun, XM
Sun, Y
Sun, Z
Surrow, B
Symons, TJM
de Toledo, AS
Takahashi, J
Tang, AH
Tang, Z
Tarini, LH
Tarnowsky, T
Thein, D
Thomas, JH
Tian, J
Timmins, AR
Timoshenko, S
Tlusty, D
Tokarev, M
Trainor, TA
Tram, VN
Trentalange, S
Tribble, RE
Tsai, OD
Ulery, J
Ullrich, T
Underwood, DG
Van Buren, G
van Nieuwenhuizen, G
Vanfossen, JA
Varma, R
Vasconcelos, GMS
Vasiliev, AN
Videbaek, F
Viyogi, YP
Vokal, S
Voloshin, SA
Wada, M
Walker, M
Wang, F
Wang, G
Wang, H
Wang, JS
Wang, Q
Wang, X
Wang, XL
Wang, Y
Webb, G
Webb, JC
Westfall, GD
Whitten, C
Wieman, H
Wingfield, E
Wissink, SW
Witt, R
Wu, Y
Xie, W
Xu, N
Xu, QH
Xu, W
Xu, Y
Xu, Z
Xue, L
Yang, Y
Yepes, P
Yip, K
Yoo, IK
Yue, Q
Zawisza, M
Zbroszczyk, H
Zhan, W
Zhang, S
Zhang, WM
Zhang, XP
Zhang, Y
Zhang, ZP
Zhao, J
Zhong, C
Zhou, J
Zhou, W
Zhu, X
Zhu, YH
Zoulkarneev, R
Zoulkarneeva, Y
AF Abelev, B. I.
Aggarwal, M. M.
Ahammed, Z.
Alakhverdyants, A. V.
Anderson, B. D.
Arkhipkin, D.
Averichev, G. S.
Balewski, J.
Barnby, L. S.
Baumgart, S.
Beavis, D. R.
Bellwied, R.
Benedosso, F.
Betancourt, M. J.
Betts, R. R.
Bhasin, A.
Bhati, A. K.
Bichsel, H.
Bielcik, J.
Bielcikova, J.
Biritz, B.
Bland, L. C.
Bonner, B. E.
Bouchet, J.
Braidot, E.
Brandin, A. V.
Bridgeman, A.
Bruna, E.
Bueltmann, S.
Bunzarov, I.
Burton, T. P.
Cai, X. Z.
Caines, H.
Sanchez, M. Calderon de la Barca
Catu, O.
Cebra, D.
Cendejas, R.
Cervantes, M. C.
Chajecki, Z.
Chaloupka, P.
Chattopadhyay, S.
Chen, H. F.
Chen, J. H.
Chen, J. Y.
Cheng, J.
Cherney, M.
Chikanian, A.
Choi, K. E.
Christie, W.
Chung, P.
Chung, S. U.
Clarke, R. F.
Codrington, M. J. M.
Corliss, R.
Cramer, J. G.
Crawford, H. J.
Das, D.
Dash, S.
Leyva, A. Davila
De Silva, L. C.
Debbe, R. R.
Dedovich, T. G.
DePhillips, M.
Derevschikov, A. A.
de Souza, R. Derradi
Didenko, L.
Djawotho, P.
Dogra, S. M.
Dong, X.
Drachenberg, J. L.
Draper, J. E.
Dunlop, J. C.
Mazumdar, M. R. Dutta
Efimov, L. G.
Elhalhuli, E.
Elnimr, M.
Engelage, J.
Eppley, G.
Erazmus, B.
Estienne, M.
Eun, L.
Evdokimov, O.
Fachini, P.
Fatemi, R.
Fedorisin, J.
Fersch, R. G.
Filip, P.
Finch, E.
Fine, V.
Fisyak, Y.
Gagliardi, C. A.
Gangadharan, D. R.
Ganti, M. S.
Garcia-Solis, E. J.
Geromitsos, A.
Geurts, F.
Ghazikhanian, V.
Ghosh, P.
Gorbunov, Y. N.
Gordon, A.
Grebenyuk, O.
Grosnick, D.
Grube, B.
Guertin, S. M.
Gupta, A.
Gupta, N.
Guryn, W.
Haag, B.
Hallman, T. J.
Hamed, A.
Han, L. -X.
Harris, J. W.
Hays-Wehle, J. P.
Heinz, M.
Heppelmann, S.
Hirsch, A.
Hjort, E.
Hoffman, A. M.
Hoffmann, G. W.
Hofman, D. J.
Hollis, R. S.
Huang, H. Z.
Humanic, T. J.
Huo, L.
Igo, G.
Iordanova, A.
Jacobs, P.
Jacobs, W. W.
Jakl, P.
Jena, C.
Jin, F.
Jones, C. L.
Jones, P. G.
Joseph, J.
Judd, E. G.
Kabana, S.
Kajimoto, K.
Kang, K.
Kapitan, J.
Kauder, K.
Keane, D.
Kechechyan, A.
Kettler, D.
Kikola, D. P.
Kiryluk, J.
Kisiel, A.
Klein, S. R.
Knospe, A. G.
Kocoloski, A.
Koetke, D. D.
Kollegger, T.
Konzer, J.
Kopytine, M.
Koralt, I.
Korsch, W.
Kotchenda, L.
Kouchpil, V.
Kravtsov, P.
Krueger, K.
Krus, M.
Kumar, L.
Kurnadi, P.
Lamont, M. A. C.
Landgraf, J. M.
LaPointe, S.
Lauret, J.
Lebedev, A.
Lednicky, R.
Lee, C. -H.
Lee, J. H.
Leight, W.
LeVine, M. J.
Li, C.
Li, L.
Li, N.
Li, W.
Li, X.
Li, X.
Li, Y.
Li, Z.
Lin, G.
Lindenbaum, S. J.
Lisa, M. A.
Liu, F.
Liu, H.
Liu, J.
Ljubicic, T.
Llope, W. J.
Longacre, R. S.
Love, W. A.
Lu, Y.
Ma, G. L.
Ma, Y. G.
Mahapatra, D. P.
Majka, R.
Mall, O. I.
Mangotra, L. K.
Manweiler, R.
Margetis, S.
Markert, C.
Masui, H.
Matis, H. S.
Matulenko, Yu. A.
McDonald, D.
McShane, T. S.
Meschanin, A.
Milner, R.
Minaev, N. G.
Mioduszewski, S.
Mischke, A.
Mitrovski, M. K.
Mohanty, B.
Mondal, M. M.
Morozov, D. A.
Munhoz, M. G.
Nandi, B. K.
Nattrass, C.
Nayak, T. K.
Nelson, J. M.
Netrakanti, P. K.
Ng, M. J.
Nogach, L. V.
Nurushev, S. B.
Odyniec, G.
Ogawa, A.
Okada, H.
Okorokov, V.
Olson, D.
Pachr, M.
Page, B. S.
Pal, S. K.
Pandit, Y.
Panebratsev, Y.
Pawlak, T.
Peitzmann, T.
Perevoztchikov, V.
Perkins, C.
Peryt, W.
Phatak, S. C.
Pile, P.
Planinic, M.
Ploskon, M. A.
Pluta, J.
Plyku, D.
Poljak, N.
Poskanzer, A. M.
Potukuchi, B. V. K. S.
Powell, C. B.
Prindle, D.
Pruneau, C.
Pruthi, N. K.
Pujahari, P. R.
Putschke, J.
Raniwala, R.
Raniwala, S.
Ray, R. L.
Redwine, R.
Reed, R.
Rehberg, J. M.
Ritter, H. G.
Roberts, J. B.
Rogachevskiy, O. V.
Romero, J. L.
Rose, A.
Roy, C.
Ruan, L.
Russcher, M. J.
Sahoo, R.
Sakai, S.
Sakrejda, I.
Sakuma, T.
Salur, S.
Sandweiss, J.
Sangaline, E.
Schambach, J.
Scharenberg, R. P.
Schmitz, N.
Schuster, T. R.
Seele, J.
Seger, J.
Selyuzhenkov, I.
Seyboth, P.
Shahaliev, E.
Shao, M.
Sharma, M.
Shi, S. S.
Sichtermann, E. P.
Simon, F.
Singaraju, R. N.
Skoby, M. J.
Smirnov, N.
Sorensen, P.
Sowinski, J.
Spinka, H. M.
Srivastava, B.
Stanislaus, T. D. S.
Staszak, D.
Stevens, J. R.
Stock, R.
Strikhanov, M.
Stringfellow, B.
Suaide, A. A. P.
Suarez, M. C.
Subba, N. L.
Sumbera, M.
Sun, X. M.
Sun, Y.
Sun, Z.
Surrow, B.
Symons, T. J. M.
de Toledo, A. Szanto
Takahashi, J.
Tang, A. H.
Tang, Z.
Tarini, L. H.
Tarnowsky, T.
Thein, D.
Thomas, J. H.
Tian, J.
Timmins, A. R.
Timoshenko, S.
Tlusty, D.
Tokarev, M.
Trainor, T. A.
Tram, V. N.
Trentalange, S.
Tribble, R. E.
Tsai, O. D.
Ulery, J.
Ullrich, T.
Underwood, D. G.
Van Buren, G.
van Nieuwenhuizen, G.
Vanfossen, J. A., Jr.
Varma, R.
Vasconcelos, G. M. S.
Vasiliev, A. N.
Videbaek, F.
Viyogi, Y. P.
Vokal, S.
Voloshin, S. A.
Wada, M.
Walker, M.
Wang, F.
Wang, G.
Wang, H.
Wang, J. S.
Wang, Q.
Wang, X.
Wang, X. L.
Wang, Y.
Webb, G.
Webb, J. C.
Westfall, G. D.
Whitten, C., Jr.
Wieman, H.
Wingfield, E.
Wissink, S. W.
Witt, R.
Wu, Y.
Xie, W.
Xu, N.
Xu, Q. H.
Xu, W.
Xu, Y.
Xu, Z.
Xue, L.
Yang, Y.
Yepes, P.
Yip, K.
Yoo, I. -K.
Yue, Q.
Zawisza, M.
Zbroszczyk, H.
Zhan, W.
Zhang, S.
Zhang, W. M.
Zhang, X. P.
Zhang, Y.
Zhang, Z. P.
Zhao, J.
Zhong, C.
Zhou, J.
Zhou, W.
Zhu, X.
Zhu, Y. H.
Zoulkarneev, R.
Zoulkarneeva, Y.
CA STAR Collaboration
TI Observation of pi(+)pi(-)pi(+)pi(-) photoproduction in ultraperipheral
heavy-ion collisions at root s(NN)=200 GeV at the STAR detector
SO PHYSICAL REVIEW C
LA English
DT Article
ID HELICITY-COUPLING AMPLITUDES; TIME PROJECTION CHAMBER; GAMMA-GAMMA;
PHOTON; PHYSICS; MASS; QUARKONIA
AB We present a measurement of pi(+)pi(-)pi(+)pi(-) photonuclear production in ultraperipheral Au-Au collisions at root s(NN) = 200 GeV from the STAR experiment. The pi(+)pi(-)pi(+)pi(-) final states are observed at low transverse momentum and are accompanied by mutual nuclear excitation of the beam particles. The strong enhancement of the production cross section at low transverse momentum is consistent with coherent photoproduction. The pi(+)pi(-)pi(+)pi(-) invariant mass spectrum of the coherent events exhibits a broad peak around 1540 +/- 40 MeV/c(2) with a width of 570 +/- 60 MeV/c(2), in agreement with the photoproduction data for the rho(0)(1700). We do not observe a corresponding peak in the pi(+)pi(-) final state and measure an upper limit for the ratio of the branching fractions of the rho(0)(1700) to pi(+)pi(-) and pi(+)pi(-)pi(+)pi(-) of 2.5% at 90% confidence level. The ratio of rho(0)(1700) and rho(0)(770) coherent production cross sections is measured to be 13.4 +/- 0.8(stat.) +/- 4.4(syst.)%.
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RP Abelev, BI (reprint author), Univ Illinois, Chicago, IL 60607 USA.
RI Pandit, Yadav/I-2170-2013; Barnby, Lee/G-2135-2010; Lednicky,
Richard/K-4164-2013; Mischke, Andre/D-3614-2011; Yang,
Yanyun/B-9485-2014; Takahashi, Jun/B-2946-2012; Planinic,
Mirko/E-8085-2012; Yoo, In-Kwon/J-6222-2012; Peitzmann,
Thomas/K-2206-2012; Witt, Richard/H-3560-2012; Yip, Kin/D-6860-2013;
Xue, Liang/F-8077-2013; Bielcikova, Jana/G-9342-2014; Voloshin,
Sergei/I-4122-2013; Sumbera, Michal/O-7497-2014; Strikhanov,
Mikhail/P-7393-2014; Xu, Wenqin/H-7553-2014; Dogra, Sunil /B-5330-2013;
Chaloupka, Petr/E-5965-2012; Nattrass, Christine/J-6752-2016; Derradi de
Souza, Rafael/M-4791-2013; Suaide, Alexandre/L-6239-2016; Inst. of
Physics, Gleb Wataghin/A-9780-2017; Okorokov, Vitaly/C-4800-2017; Ma,
Yu-Gang/M-8122-2013;
OI Pandit, Yadav/0000-0003-2809-7943; Barnby, Lee/0000-0001-7357-9904;
Yang, Yanyun/0000-0002-5982-1706; Takahashi, Jun/0000-0002-4091-1779;
Peitzmann, Thomas/0000-0002-7116-899X; Yip, Kin/0000-0002-8576-4311;
Xue, Liang/0000-0002-2321-9019; Sumbera, Michal/0000-0002-0639-7323;
Strikhanov, Mikhail/0000-0003-2586-0405; Xu, Wenqin/0000-0002-5976-4991;
Nattrass, Christine/0000-0002-8768-6468; Derradi de Souza,
Rafael/0000-0002-2084-7001; Suaide, Alexandre/0000-0003-2847-6556;
Okorokov, Vitaly/0000-0002-7162-5345; Ma, Yu-Gang/0000-0002-0233-9900;
Mohanty, Bedangadas/0000-0001-9610-2914; Bhasin,
Anju/0000-0002-3687-8179
FU US DOE Office of Science; US NSF; Sloan Foundation; DFG; CNRS
[CNRS/IN2P3]; STFC; EPSRC of the United Kingdom; FAPESP CNPq of Brazil;
Ministry of Education and Science of the Russian Federation; NNSFC; CAS;
MoST; MoE of China; Czech Republic; FOM and NWO of the Netherlands; DAE;
CSIR of India; Polish Ministry of Science and Higher Education; Korean
Research Foundation; Ministry of Science, Education, and Sports of the
Republic of Croatia; Russian Ministry of Science and Technology and
RosAtom of Russia
FX We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at
LBNL, and the Open Science Grid consortium for providing resources and
support. This work was supported in part by the Offices of NP and HEP
within the US DOE Office of Science; the US NSF; the Sloan Foundation;
the DFG cluster of excellence "Origin and Structure of the Universe";
CNRS/IN2P3, STFC, and EPSRC of the United Kingdom; FAPESP CNPq of
Brazil; Ministry of Education and Science of the Russian Federation;
NNSFC, CAS, MoST, and MoE of China; GA and MSMT of the Czech Republic;
FOM and NWO of the Netherlands; DAE, DST, and CSIR of India; the Polish
Ministry of Science and Higher Education; Korean Research Foundation;
Ministry of Science, Education, and Sports of the Republic of Croatia;
and the Russian Ministry of Science and Technology and RosAtom of
Russia.
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SN 0556-2813
EI 1089-490X
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 044901
DI 10.1103/PhysRevC.81.044901
PG 9
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500056
ER
PT J
AU Erikson, L
Ruiz, C
Ames, F
Bricault, P
Buchmann, L
Chen, AA
Chen, J
Dare, H
Davids, B
Davis, C
Deibel, CM
Dombsky, M
Foubister, S
Galinski, N
Greife, U
Hager, U
Hussein, A
Hutcheon, DA
Lassen, J
Martin, L
Ottewell, DF
Ouellet, CV
Ruprecht, G
Setoodehnia, K
Shotter, AC
Teigelhofer, A
Vockenhuber, C
Wrede, C
Wallner, A
AF Erikson, L.
Ruiz, C.
Ames, F.
Bricault, P.
Buchmann, L.
Chen, A. A.
Chen, J.
Dare, H.
Davids, B.
Davis, C.
Deibel, C. M.
Dombsky, M.
Foubister, S.
Galinski, N.
Greife, U.
Hager, U.
Hussein, A.
Hutcheon, D. A.
Lassen, J.
Martin, L.
Ottewell, D. F.
Ouellet, C. V.
Ruprecht, G.
Setoodehnia, K.
Shotter, A. C.
Teigelhoefer, A.
Vockenhuber, C.
Wrede, C.
Wallner, A.
TI First direct measurement of the Mg-23(p,gamma)Al-24 reaction
SO PHYSICAL REVIEW C
LA English
DT Article
ID THERMONUCLEAR REACTION-RATE; DRAGON FACILITY; ISAC; CALIBRATION;
OPERATION; AL-24
AB The lowest-energy resonance in the Mg-23(p,gamma)Al-24 reaction, which is dominant at classical nova temperatures, has been measured directly for the first time using the DRAGON recoil spectrometer. The experiment used a radioactive Mg-23 beam (mixed within a significantly stronger Na-23 beam) of peak intensity 5 x 10(7) s(-1), at the ISAC facility at TRIUMF. We extract values of E-R = 485.7(-1.8)(+1.3) keV and omega gamma = 38(-15)(+21) meV from our data (all values in the center-of-mass frame unless otherwise stated). In addition, the experiment prompted a recalculation of the Q value for this reaction based on a revision of the Al-24 mass. The effect on the uncertainties in the quantities of ejected Na-22 and Al-26 from oxygen-neon classical novae is discussed.
C1 [Erikson, L.; Greife, U.] Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA.
[Ruiz, C.; Ames, F.; Bricault, P.; Buchmann, L.; Davids, B.; Davis, C.; Dombsky, M.; Galinski, N.; Hager, U.; Hutcheon, D. A.; Lassen, J.; Martin, L.; Ottewell, D. F.; Ruprecht, G.; Teigelhoefer, A.; Vockenhuber, C.] TRIUMF, Vancouver, BC V6T 2A3, Canada.
[Chen, A. A.; Chen, J.; Ouellet, C. V.; Setoodehnia, K.] McMaster Univ, Hamilton, ON L8S 481, Canada.
[Dare, H.] Univ Surrey, Guildford GU2 7XH, Surrey, England.
[Deibel, C. M.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
[Deibel, C. M.] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA.
[Foubister, S.] Thompson Rivers Univ, Kamloops, BC V2C 5N3, Canada.
[Hussein, A.] Univ No British Columbia, Prince George, BC V2N 4Z9, Canada.
[Shotter, A. C.] Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland.
[Vockenhuber, C.] ETH, Lab Ion Beam Phys, CH-8093 Zurich, Switzerland.
[Wrede, C.] Univ Washington, Seattle, WA 98195 USA.
[Wallner, A.] Univ Vienna, A-1010 Vienna, Austria.
RP Erikson, L (reprint author), Colorado Sch Mines, Dept Phys, Golden, CO 80401 USA.
EM ruiz@triumf.ca
RI Wallner, Anton/G-1480-2011; Hager, Ulrike/O-1738-2016
OI Wallner, Anton/0000-0003-2804-3670;
FU Natural Sciences and Engineering Research Council of Canada (NSERC);
National Research Council of Canada (NRC); US DOE Office of Science
[DE-FG02-93ER40789]
FX The authors acknowledge the support of the Natural Sciences and
Engineering Research Council of Canada (NSERC) in carrying out this
work. TRIUMF is federally funded through the National Research Council
of Canada (NRC). Also acknowledged is support from the US DOE Office of
Science Grant No. DE-FG02-93ER40789.
NR 24
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0556-2813
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 045808
DI 10.1103/PhysRevC.81.045808
PG 12
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500089
ER
PT J
AU Fallon, P
Rodriguez-Vieitez, E
Macchiavelli, AO
Gade, A
Tostevin, JA
Adrich, P
Bazin, D
Bowen, M
Campbell, CM
Clark, RM
Cook, JM
Cromaz, M
Dinca, DC
Glasmacher, T
Lee, IY
McDaniel, S
Mueller, WF
Prussin, SG
Ratkiewicz, A
Siwek, K
Terry, JR
Weisshaar, D
Wiedeking, M
Yoneda, K
Brown, BA
Otsuka, T
Utsuno, Y
AF Fallon, P.
Rodriguez-Vieitez, E.
Macchiavelli, A. O.
Gade, A.
Tostevin, J. A.
Adrich, P.
Bazin, D.
Bowen, M.
Campbell, C. M.
Clark, R. M.
Cook, J. M.
Cromaz, M.
Dinca, D. C.
Glasmacher, T.
Lee, I. Y.
McDaniel, S.
Mueller, W. F.
Prussin, S. G.
Ratkiewicz, A.
Siwek, K.
Terry, J. R.
Weisshaar, D.
Wiedeking, M.
Yoneda, K.
Brown, B. A.
Otsuka, T.
Utsuno, Y.
TI Two-proton knockout from Mg-32: Intruder amplitudes in Ne-30 and
implications for the binding of F-29,F-31
SO PHYSICAL REVIEW C
LA English
DT Article
ID SHELL-MODEL
AB gamma-ray decays from excited states in Ne-30 and inclusive and exclusive cross sections were measured in the Be-9(Mg-32, Ne-30 + gamma) X two-proton knockout reaction at incident beam energies of 99.7 and 86.7 MeV/nucleon. Themeasured cross section is suppressed compared to calculations and is indicative of a reduced overlap of initial and final state wave functions in Mg-32 and Ne-30. We interpret this reduction as due to large 4p4h amplitudes present in the Ne-30 ground state wave function, but not Mg-32. Such large intruder components are predicted to help stabilize the heavier fluorine isotopes against neutron emission.
C1 [Fallon, P.; Rodriguez-Vieitez, E.; Macchiavelli, A. O.; Clark, R. M.; Cromaz, M.; Lee, I. Y.; Wiedeking, M.] Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
[Rodriguez-Vieitez, E.; Prussin, S. G.] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA.
[Gade, A.; Adrich, P.; Bazin, D.; Bowen, M.; Campbell, C. M.; Cook, J. M.; Dinca, D. C.; Glasmacher, T.; McDaniel, S.; Mueller, W. F.; Ratkiewicz, A.; Siwek, K.; Terry, J. R.; Weisshaar, D.; Yoneda, K.; Brown, B. A.] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA.
[Gade, A.; Bowen, M.; Campbell, C. M.; Cook, J. M.; Dinca, D. C.; Glasmacher, T.; McDaniel, S.; Ratkiewicz, A.; Siwek, K.; Terry, J. R.; Yoneda, K.; Brown, B. A.] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA.
[Tostevin, J. A.] Univ Surrey, Fac Engn & Phys Sci, Dept Phys, Guildford GU2 7XH, Surrey, England.
[Otsuka, T.] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.
[Otsuka, T.] RIKEN, Wako, Saitama 3510198, Japan.
[Utsuno, Y.] Japan Atom Energy Agcy, Tokai, Ibaraki 3191195, Japan.
RP Fallon, P (reprint author), Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
RI Campbell, Christopher/B-9429-2008; Gade, Alexandra/A-6850-2008;
Glasmacher, Thomas/H-9673-2014; OTSUKA, TAKAHARU/G-5072-2014
OI Gade, Alexandra/0000-0001-8825-0976; Glasmacher,
Thomas/0000-0001-9436-2448;
FU DOE Office of Nuclear Physics [DE-AC02-05CH11231]; National Science
Foundation [PHY-0606007, PHY-0758099]; UK Science and Technology
Facilities Council [ST/F012012, EP/D003628]
FX We gratefully acknowledge the help of the NSCL operations staff. We
thank Prof. Hamamoto for illuminating discussions. This work was
supported by the DOE Office of Nuclear Physics under Contract No.
DE-AC02-05CH11231, the National Science Foundation under Grant Nos.
PHY-0606007 and PHY-0758099, and by the UK Science and Technology
Facilities Council under Grant Nos. ST/F012012 and EP/D003628.
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0556-2813
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 041302
DI 10.1103/PhysRevC.81.041302
PG 5
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500002
ER
PT J
AU Kopp, J
Merle, A
AF Kopp, Joachim
Merle, Alexander
TI Ultralow Q values for neutrino mass measurements
SO PHYSICAL REVIEW C
LA English
DT Article
ID STATE BETA-DECAY; SEARCH; IONS; ENERGIES; ATOMS
AB We investigate weak nuclear decays with extremely small kinetic energy release (Q value) and thus extremely good sensitivity to the absolute neutrino mass scale. In particular, we consider decays into excited daughter states, and we show that partial ionization of the parent atom can help to tune Q values to << 1 keV. We discuss several candidate isotopes undergoing beta(+/-), bound state beta, or electron capture decay and come to the conclusion that a neutrino mass measurement using low-Q decays might only be feasible if no ionization is required and if future improvements in isotope production technology, nuclear mass spectroscopy, and atomic structure calculations are possible. Experiments using ions, however, are extremely challenging because of the large number of ions that must be stored. New precision data on nuclear excitation levels could help to identify further isotopes with low-Q decay modes and possibly less challenging requirements.
C1 [Kopp, Joachim; Merle, Alexander] Max Planck Inst Kernphys, D-69029 Heidelberg, Germany.
[Kopp, Joachim] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
RP Kopp, J (reprint author), Max Planck Inst Kernphys, Postfach 10 39 80, D-69029 Heidelberg, Germany.
EM jkopp@fnal.gov; amerle@mpi-hd.mpg.de
RI Kopp, Joachim/B-5866-2013
FU DFG-SFB TR 27; US Department of Energy [DE-AC02-07CH11359]
FX It is a pleasure to thank K. Blaum, F. Bosch, G. Heusser, B. Kayser, M.
Lindner, Yu. Litvinov, Yu. Novikov, and M. Weber for useful and
inspiring discussions. This work has been supported by the DFG-SFB TR 27
"Neutrinos and Beyond." Fermilab is operated by Fermi Research Alliance,
LLC, under Contract No. DE-AC02-07CH11359 with the US Department of
Energy.
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0556-2813
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 045501
DI 10.1103/PhysRevC.81.045501
PG 5
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500080
ER
PT J
AU Massimi, C
Domingo-Pardo, C
Vannini, G
Audouin, L
Guerrero, C
Abbondanno, U
Aerts, G
Alvarez, H
Alvarez-Velarde, F
Andriamonje, S
Andrzejewski, J
Assimakopoulos, P
Badurek, G
Baumann, P
Becvar, F
Belloni, F
Berthoumieux, E
Calvino, F
Calviani, M
Cano-Ott, D
Capote, R
Carrapico, C
Cennini, P
Chepel, V
Chiaveri, E
Colonna, N
Cortes, G
Couture, A
Cox, J
Dahlfors, M
David, S
Dillmann, I
Dridi, W
Duran, I
Eleftheriadis, C
Ferrant, L
Ferrari, A
Ferreira-Marques, R
Fujii, K
Furman, W
Galanopoulos, S
Goncalves, IF
Gonzalez-Romero, E
Gramegna, F
Gunsing, F
Haas, B
Haight, R
Heil, M
Herrera-Martinez, A
Igashira, M
Jericha, E
Kappeler, F
Kadi, Y
Karadimos, D
Karamanis, D
Kerveno, M
Koehler, P
Kossionides, E
Krticka, M
Lampoudis, C
Lederer, C
Leeb, H
Lindote, A
Lopes, I
Lozano, M
Lukic, S
Marganiec, J
Marrone, S
Martinez, T
Mastinu, P
Mendoza, E
Mengoni, A
Milazzo, PM
Moreau, C
Mosconi, M
Neves, F
Oberhummer, H
O'Brien, S
Pancin, J
Papadopoulos, C
Paradela, C
Pavlik, A
Pavlopoulos, P
Perdikakis, G
Perrot, L
Pigni, MT
Plag, R
Plompen, A
Plukis, A
Poch, A
Praena, J
Pretel, C
Quesada, J
Rauscher, T
Reifarth, R
Rosetti, M
Rubbia, C
Rudolf, G
Rullhusen, P
Sarchiapone, L
Sarmento, R
Savvidis, I
Stephan, C
Tagliente, G
Tain, JL
Tassan-Got, L
Tavora, L
Terlizzi, R
Vaz, P
Ventura, A
Villamarin, D
Vlachoudis, V
Vlastou, R
Voss, F
Walter, S
Wiescher, M
Wisshak, K
AF Massimi, C.
Domingo-Pardo, C.
Vannini, G.
Audouin, L.
Guerrero, C.
Abbondanno, U.
Aerts, G.
Alvarez, H.
Alvarez-Velarde, F.
Andriamonje, S.
Andrzejewski, J.
Assimakopoulos, P.
Badurek, G.
Baumann, P.
Becvar, F.
Belloni, F.
Berthoumieux, E.
Calvino, F.
Calviani, M.
Cano-Ott, D.
Capote, R.
Carrapico, C.
Cennini, P.
Chepel, V.
Chiaveri, E.
Colonna, N.
Cortes, G.
Couture, A.
Cox, J.
Dahlfors, M.
David, S.
Dillmann, I.
Dridi, W.
Duran, I.
Eleftheriadis, C.
Ferrant, L.
Ferrari, A.
Ferreira-Marques, R.
Fujii, K.
Furman, W.
Galanopoulos, S.
Goncalves, I. F.
Gonzalez-Romero, E.
Gramegna, F.
Gunsing, F.
Haas, B.
Haight, R.
Heil, M.
Herrera-Martinez, A.
Igashira, M.
Jericha, E.
Kaeppeler, F.
Kadi, Y.
Karadimos, D.
Karamanis, D.
Kerveno, M.
Koehler, P.
Kossionides, E.
Krticka, M.
Lampoudis, C.
Lederer, C.
Leeb, H.
Lindote, A.
Lopes, I.
Lozano, M.
Lukic, S.
Marganiec, J.
Marrone, S.
Martinez, T.
Mastinu, P.
Mendoza, E.
Mengoni, A.
Milazzo, P. M.
Moreau, C.
Mosconi, M.
Neves, F.
Oberhummer, H.
O'Brien, S.
Pancin, J.
Papadopoulos, C.
Paradela, C.
Pavlik, A.
Pavlopoulos, P.
Perdikakis, G.
Perrot, L.
Pigni, M. T.
Plag, R.
Plompen, A.
Plukis, A.
Poch, A.
Praena, J.
Pretel, C.
Quesada, J.
Rauscher, T.
Reifarth, R.
Rosetti, M.
Rubbia, C.
Rudolf, G.
Rullhusen, P.
Sarchiapone, L.
Sarmento, R.
Savvidis, I.
Stephan, C.
Tagliente, G.
Tain, J. L.
Tassan-Got, L.
Tavora, L.
Terlizzi, R.
Vaz, P.
Ventura, A.
Villamarin, D.
Vlachoudis, V.
Vlastou, R.
Voss, F.
Walter, S.
Wiescher, M.
Wisshak, K.
CA N TOF Collaboration
TI Au-197(n,gamma) cross section in the resonance region
SO PHYSICAL REVIEW C
LA English
DT Article
ID TOTAL ABSORPTION CALORIMETER; SPALLATION NEUTRON SOURCE; OF-FLIGHT
FACILITY; N-TOF; CAPTURE; DETECTOR; CERN; STANDARDS; ELEMENTS; SPECTRA
AB The (n,gamma) cross section of Au-197 has been measured at n_TOF in the resolved resonance region, up to 5 keV, with the aim of improving the accuracy in an energy range where it is not yet considered standard. The measurements were performed with two different experimental setup and detection techniques, the total energy method based on C6D6 detectors, and the total absorption calorimetry based on a 4 pi BaF2 array. By comparing the data collected with the two techniques, two accurate sets of neutron-capture yields have been obtained, which could be the basis for a new evaluation leading to an extended cross-section standard. Overall good agreement is found between the n_TOF results and evaluated cross sections, with some significant exceptions for small resonances. A few resonances not included in the existing databases have also been observed.
C1 [Domingo-Pardo, C.] GSI Helmholtzzentrum Schwerionenforsch GmbH, Darmstadt, Germany.
[Massimi, C.; Vannini, G.] Univ Bologna, Dipartimento Fis, I-40126 Bologna, Italy.
[Audouin, L.; David, S.; Ferrant, L.; Stephan, C.; Tassan-Got, L.] CNRS, IN2P3, IPN, F-91405 Orsay, France.
[Guerrero, C.; Alvarez-Velarde, F.; Cano-Ott, D.; Gonzalez-Romero, E.; Martinez, T.; Mendoza, E.; Villamarin, D.] Ctr Invest Energet Medioambientales & Tecnol, Madrid, Spain.
[Abbondanno, U.; Belloni, F.; Fujii, K.; Milazzo, P. M.; Moreau, C.] Ist Nazl Fis Nucl, Trieste, Italy.
[Aerts, G.; Andriamonje, S.; Berthoumieux, E.; Carrapico, C.; Dridi, W.; Gunsing, F.; Pancin, J.; Perrot, L.; Plukis, A.] CEA Saclay, IRFU, F-91191 Gif Sur Yvette, France.
[Alvarez, H.; Duran, I.; Paradela, C.] Univ Santiago de Compostela, Santiago, Spain.
[Andrzejewski, J.; Marganiec, J.] Univ Lodz, PL-90131 Lodz, Poland.
[Assimakopoulos, P.; Karadimos, D.; Karamanis, D.] Univ Ioannina, GR-45110 Ioannina, Greece.
[Badurek, G.; Jericha, E.; Leeb, H.; Oberhummer, H.; Pigni, M. T.] Vienna Univ Technol, Atominst Osterreich Univ, Vienna, Austria.
[Baumann, P.; Kerveno, M.; Lukic, S.; Rudolf, G.] CNRS, IN2P3, IReS, Strasbourg, France.
[Becvar, F.; Krticka, M.] Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic.
[Calvino, F.] Univ Politecn Madrid, E-28040 Madrid, Spain.
[Calviani, M.; Cennini, P.; Chiaveri, E.; Dahlfors, M.; Ferrari, A.; Herrera-Martinez, A.; Kadi, Y.; Mengoni, A.; Rubbia, C.; Sarchiapone, L.; Vlachoudis, V.] CERN, Geneva, Switzerland.
[Capote, R.; Mengoni, A.] IAEA, Nucl Data Sect, A-1400 Vienna, Austria.
[Capote, R.; Lozano, M.; Quesada, J.] Univ Seville, Seville, Spain.
[Carrapico, C.; Goncalves, I. F.; Sarmento, R.; Tavora, L.; Vaz, P.] ITN, Lisbon, Portugal.
[Chepel, V.; Ferreira-Marques, R.; Lindote, A.; Lopes, I.; Neves, F.] Univ Coimbra, LIP Coimbra, P-3000 Coimbra, Portugal.
[Chepel, V.; Ferreira-Marques, R.; Lindote, A.; Lopes, I.; Neves, F.] Univ Coimbra, Dept Fis, P-3000 Coimbra, Portugal.
[Colonna, N.; Marrone, S.; Tagliente, G.; Terlizzi, R.] Ist Nazl Fis Nucl, I-70126 Bari, Italy.
[Cortes, G.; Poch, A.; Pretel, C.] Univ Politecn Cataluna, Barcelona, Spain.
[Couture, A.; Cox, J.; O'Brien, S.; Wiescher, M.] Univ Notre Dame, Notre Dame, IN 46556 USA.
[Dillmann, I.; Heil, M.; Kaeppeler, F.; Mosconi, M.; Plag, R.; Voss, F.; Walter, S.; Wisshak, K.] Karlsruhe Inst Technol, Inst Kernphys, Karlsruhe, Germany.
[Eleftheriadis, C.; Savvidis, I.] Aristotle Univ Thessaloniki, Thessaloniki, Greece.
[Furman, W.] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna, Russia.
[Galanopoulos, S.; Papadopoulos, C.; Perdikakis, G.; Vlastou, R.] Natl Tech Univ Athens, GR-10682 Athens, Greece.
[Gramegna, F.; Mastinu, P.; Praena, J.] Ist Nazl Fis Nucl, Lab Nazl Legnaro, Milan, Italy.
[Haas, B.] CNRS, IN2P3, CENBG, Bordeaux, France.
[Haight, R.; Reifarth, R.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Igashira, M.] Tokyo Inst Technol, Tokyo 152, Japan.
[Koehler, P.] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA.
[Kossionides, E.] NCSR, Athens, Greece.
[Lampoudis, C.; Plompen, A.; Rullhusen, P.] EC JRC IRMM, Geel, Belgium.
[Lederer, C.; Pavlik, A.] Univ Vienna, Fac Phys, A-1010 Vienna, Austria.
[Pavlopoulos, P.] Pole Univ Leonard de Vinci, Paris, France.
[Rauscher, T.] Univ Basel, Dept Phys, CH-4003 Basel, Switzerland.
[Rosetti, M.; Ventura, A.] ENEA, Bologna, Italy.
[Tain, J. L.] Univ Valencia, CSIC, Inst Fis Corpuscular, E-46003 Valencia, Spain.
RP Domingo-Pardo, C (reprint author), GSI Helmholtzzentrum Schwerionenforsch GmbH, Darmstadt, Germany.
EM c.domingopardo@gsi.de
RI Massimi, Cristian/K-2008-2015; Perdikakis, Georgios/K-4525-2014;
Paradela, Carlos/J-1492-2012; Calvino, Francisco/K-5743-2014; Mengoni,
Alberto/I-1497-2012; Cano Ott, Daniel/K-4945-2014; Quesada Molina, Jose
Manuel/K-5267-2014; Mendoza Cembranos, Emilio/K-5789-2014; Gramegna,
Fabiana/B-1377-2012; Guerrero, Carlos/L-3251-2014; Gonzalez Romero,
Enrique/L-7561-2014; Pretel Sanchez, Carme/L-8287-2014; Martinez,
Trinitario/K-6785-2014; Capote Noy, Roberto/M-1245-2014; Massimi,
Cristian/B-2401-2015; Duran, Ignacio/H-7254-2015; Alvarez Pol,
Hector/F-1930-2011; Jericha, Erwin/A-4094-2011; Rauscher,
Thomas/D-2086-2009; Becvar, Frantisek/D-3824-2012; Chepel,
Vitaly/H-4538-2012; Ventura, Alberto/B-9584-2011; Lindote,
Alexandre/H-4437-2013; Lederer, Claudia/H-4677-2013; Neves,
Francisco/H-4744-2013; Goncalves, Isabel/J-6954-2013; Vaz,
Pedro/K-2464-2013; Lopes, Isabel/A-1806-2014; Tain, Jose L./K-2492-2014
OI Massimi, Cristian/0000-0003-2499-5586; Perdikakis,
Georgios/0000-0002-8539-8737; Calvino, Francisco/0000-0002-7198-4639;
Mengoni, Alberto/0000-0002-2537-0038; Cano Ott,
Daniel/0000-0002-9568-7508; Quesada Molina, Jose
Manuel/0000-0002-2038-2814; Mendoza Cembranos,
Emilio/0000-0002-2843-1801; Gramegna, Fabiana/0000-0001-6112-0602;
Guerrero, Carlos/0000-0002-2111-546X; Gonzalez Romero,
Enrique/0000-0003-2376-8920; Martinez, Trinitario/0000-0002-0683-5506;
Capote Noy, Roberto/0000-0002-1799-3438; Massimi,
Cristian/0000-0001-9792-3722; Alvarez Pol, Hector/0000-0001-9643-6252;
Jericha, Erwin/0000-0002-8663-0526; Rauscher,
Thomas/0000-0002-1266-0642; Ventura, Alberto/0000-0001-6748-7931;
Lindote, Alexandre/0000-0002-7965-807X; Neves,
Francisco/0000-0003-3635-1083; Vaz, Pedro/0000-0002-7186-2359; Lopes,
Isabel/0000-0003-0419-903X;
FU European Commission [FIKW-CT-2000-00107]
FX This work was supported by the European Commission's 5th Framework
Programme under Contract No. FIKW-CT-2000-00107 (n_TOF-ND-ADS Project)
and by the funding agencies of the participating institutes.
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J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 044616
DI 10.1103/PhysRevC.81.044616
PG 22
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500051
ER
PT J
AU Tang, XD
Rehm, KE
Ahmad, I
Brune, CR
Champagne, A
Greene, JP
Hecht, A
Henderson, DJ
Janssens, RVF
Jiang, CL
Jisonna, L
Kahl, D
Moore, EF
Notani, M
Pardo, RC
Patel, N
Paul, M
Savard, G
Schiffer, JP
Segel, RE
Sinha, S
Wuosmaa, AH
AF Tang, X. D.
Rehm, K. E.
Ahmad, I.
Brune, C. R.
Champagne, A.
Greene, J. P.
Hecht, A.
Henderson, D. J.
Janssens, R. V. F.
Jiang, C. L.
Jisonna, L.
Kahl, D.
Moore, E. F.
Notani, M.
Pardo, R. C.
Patel, N.
Paul, M.
Savard, G.
Schiffer, J. P.
Segel, R. E.
Sinha, S.
Wuosmaa, A. H.
TI Determination of the E1 component of the low-energy
C-12(alpha,gamma)O-16 cross section
SO PHYSICAL REVIEW C
LA English
DT Article
ID TWIN IONIZATION-CHAMBER; DELAYED ALPHA-SPECTRUM; ANGULAR-DISTRIBUTIONS;
NUCLEAR-REACTIONS; STELLAR ENERGIES; MATRIX ANALYSIS; MASSIVE STARS;
S-FACTOR; NUCLEOSYNTHESIS; DECAY
AB A measurement of the beta-delayed alpha decay of N-16 using a set of twin ionization chambers is described. Sources were made by implantation, using a N-16 beam produced via the In-Flight Technique. The energies and emission angles of the C-12 and alpha particles were measured in coincidence and very clean alpha spectra, down to energies of 450 keV, were obtained. The structure of the spectra from this experiment is in good agreement with results from previous measurements. An analysis of our data with the same input parameters as used in earlier studies gives S-E1(300) = 86 +/- 22 keVb for the E1 component of the S-factor. This value is in excellent agreement with results obtained from various direct and indirect measurements. In addition, the influence of new measurements including the phase shift data from Tischhauser et al. on the value of S-E1(300) is discussed.
C1 [Tang, X. D.; Rehm, K. E.; Ahmad, I.; Greene, J. P.; Hecht, A.; Henderson, D. J.; Janssens, R. V. F.; Jiang, C. L.; Kahl, D.; Moore, E. F.; Notani, M.; Pardo, R. C.; Patel, N.; Savard, G.; Schiffer, J. P.; Sinha, S.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
[Tang, X. D.] Univ Notre Dame, Notre Dame, IN 46556 USA.
[Brune, C. R.] Ohio Univ, Athens, OH 45701 USA.
[Champagne, A.] Univ N Carolina, Chapel Hill, NC 27599 USA.
[Jisonna, L.; Segel, R. E.] Northwestern Univ, Evanston, IL 60208 USA.
[Patel, N.] Colorado Sch Mines, Golden, CO 80401 USA.
[Paul, M.] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel.
[Wuosmaa, A. H.] Western Michigan Univ, Kalamazoo, MI 49008 USA.
RP Tang, XD (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
RI Tang, Xiaodong /F-4891-2016
FU US Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357,
DE-FG02-98ER41086]; NSF [PHY-02-16783]
FX We want to thank the crew of the ATLAS accelerator for providing the
high-quality 15N beams. The help of B. Nardi and B. Zabransky
with the design and construction of the experimental setup is gratefully
acknowledged. We are indebted to J. Powell for making a copy of his
thesis and his R-matrix code available to us. The help of N. Scielzo
with the calculations is also appreciated. One of us (KER) wants to
thank M. Mutterer (TU Darmstadt) for explaining the advantages of twin
ionization chambers. This work was supported by the US Department of
Energy, Office of Nuclear Physics, under Contracts No. DE-AC02-06CH11357
(ANL), DE-FG02-98ER41086 (NWU) and by the NSF Grant No. PHY-02-16783
(Joint Institute for Nuclear Astrophysics).
NR 51
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0556-2813
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 045809
DI 10.1103/PhysRevC.81.045809
PG 14
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500090
ER
PT J
AU Vogt, R
AF Vogt, R.
TI Cold nuclear matter effects on J/psi and Gamma production at energies
available at the CERN Large Hadron Collider (LHC)
SO PHYSICAL REVIEW C
LA English
DT Article
ID TRANSVERSE-MOMENTUM DEPENDENCE; HEAVY QUARKONIUM PRODUCTION; DRELL-YAN
PRODUCTION; TO-LEADING ORDER; J-PSI PRODUCTION; ROOT S=1.8 TEV; PARTON
DISTRIBUTIONS; P(P)OVER-BAR COLLISIONS; NONLINEAR CORRECTIONS; DGLAP
EQUATIONS
AB The charmonium yields are expected to be considerably suppressed if a deconfined medium is formed in high-energy heavy-ion collisions. In addition, the bottomonium states, with the possible exception of the Gamma(1S) state, are also expected to be suppressed in heavy-ion collisions. However, in proton-nucleus collisions the quarkonium production cross sections, even those of the Gamma(1S), are also suppressed. These "cold nuclear matter" effects need to be accounted for before signals of the high-density QCD medium can be identified in the measurements made in nucleus-nucleus collisions. We identify two cold nuclear matter effects important for midrapidity quarkonium production: "nuclear absorption," typically characterized as a final-state effect on the produced quarkonium state, and "shadowing," the modification of the parton densities in nuclei relative to the nucleon, an initial-state effect. In this article, we characterize these effects and study the energy, rapidity, and impact-parameter dependence of initial-state shadowing.
C1 [Vogt, R.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
[Vogt, R.] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA.
RP Vogt, R (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
FU US Department of Energy [DE-AC52-07NA27344]; National Science Foundation
[NSF PHY-0555660]
FX The numerical values of the ratios shown in this article are available
from the author. We thank K. J. Eskola, H. Paukkunen, and C. Salgado for
providing the EPS09 files and for discussions. This work was performed
under the auspices of the US Department of Energy by the Lawrence
Livermore National Laboratory under Contract No. DE-AC52-07NA27344 and
was also supported in part by National Science Foundation Grant No. NSF
PHY-0555660.
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PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0556-2813
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 044903
DI 10.1103/PhysRevC.81.044903
PG 20
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500058
ER
PT J
AU Winger, JA
Rykaczewski, KP
Gross, CJ
Grzywacz, R
Batchelder, JC
Goodin, C
Hamilton, JH
Ilyushkin, SV
Korgul, A
Krolas, W
Liddick, SN
Mazzocchi, C
Padgett, S
Piechaczek, A
Rajabali, MM
Shapira, D
Zganjar, EF
Dobaczewski, J
AF Winger, J. A.
Rykaczewski, K. P.
Gross, C. J.
Grzywacz, R.
Batchelder, J. C.
Goodin, C.
Hamilton, J. H.
Ilyushkin, S. V.
Korgul, A.
Krolas, W.
Liddick, S. N.
Mazzocchi, C.
Padgett, S.
Piechaczek, A.
Rajabali, M. M.
Shapira, D.
Zganjar, E. F.
Dobaczewski, J.
TI New subshell closure at N=58 emerging in neutron-rich nuclei beyond
Ni-78
SO PHYSICAL REVIEW C
LA English
DT Article
ID DECAY SPECTROSCOPY; SHELL STRUCTURE; ISOTOPES; PARRNE
AB The structure of neutron-rich nuclei beyond Ni-78 was studied using postaccelerated radioactive beams of Ga-83,Ga-84,Ga-85 utilizing beta gamma and beta-n gamma spectroscopy. Our data, when combined with energy level systematics, suggests a possible new spherical subshell closure at N = 58 is created by the nearly degenerated nu 3s(1/2) and nu 2d(5/2) orbitals being well separated from other orbitals above N = 50. The near degeneracy of these states could be evidenced by isomerism in this region. The energies of the 2(1)(+) and proposed 4(1)(+) states observed in N = 52 Ge-84 are interpreted as an indication of a possible weakening of the doubly magic Ni-78 core for nuclei beyond N = 50. The experimental evidence is supported by spherical HFB calculations using the SkO(T) functional involving the tensor term in the nucleon-nucleon interaction.
C1 [Winger, J. A.; Ilyushkin, S. V.] Mississippi State Univ, Dept Phys & Astron, Mississippi State, MS 39762 USA.
[Rykaczewski, K. P.; Gross, C. J.; Grzywacz, R.; Shapira, D.] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA.
[Grzywacz, R.; Korgul, A.; Liddick, S. N.; Mazzocchi, C.; Padgett, S.; Rajabali, M. M.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
[Batchelder, J. C.; Liddick, S. N.] Oak Ridge Associated Univ, UNIRIB, Oak Ridge, TN 37831 USA.
[Goodin, C.; Hamilton, J. H.; Korgul, A.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA.
[Korgul, A.] Warsaw Univ, Inst Expt Phys, PL-00681 Warsaw, Poland.
[Korgul, A.; Krolas, W.] Joint Inst Heavy Ion React, Oak Ridge, TN 37831 USA.
[Krolas, W.] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland.
[Mazzocchi, C.] Univ Milan, I-20133 Milan, Italy.
[Mazzocchi, C.] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy.
[Piechaczek, A.; Zganjar, E. F.] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA.
[Dobaczewski, J.] Warsaw Univ, Inst Theoret Phys, PL-00681 Warsaw, Poland.
[Dobaczewski, J.] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland.
RP Winger, JA (reprint author), Mississippi State Univ, Dept Phys & Astron, Mississippi State, MS 39762 USA.
EM j.a.winger@msstate.edu
RI Krolas, Wojciech/N-9391-2013
FU US DOE [DE-FG02-96ER41006, DE-AC05-00OR22725, DE-FG020-96ER40983,
DE-AC05-06OR23100, DE-FG02-96ER40978, DE-FG05-88ER40407]; NNSA
[DEFC03-03NA00143]; Foundation for Polish Science; Polish Ministry of
Science [N N202 328234, N N202 103333]; Academy of Finland and
University of Jyvaskyla within the FIDIPRO Program
FX The authors gratefully acknowledge the work done by HRIBF staff in
producing such high-quality radioactive ion beams. This work was
supported under US DOE Grants DE-FG02-96ER41006, DE-AC05-00OR22725,
DE-FG020-96ER40983, DE-AC05-06OR23100, DE-FG02-96ER40978, and
DE-FG05-88ER40407; through NNSA grant DEFC03-03NA00143; through the
Foundation for Polish Science; by the Polish Ministry of Science under
Contracts No. N N202 328234 and N N202 103333; and by the Academy of
Finland and University of Jyvaskyla within the FIDIPRO Program.
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PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2469-9985
EI 2469-9993
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 044303
DI 10.1103/PhysRevC.81.044303
PG 7
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500016
ER
PT J
AU Zhu, S
Carpenter, MP
Janssens, RVF
Frauendorf, S
Ahmad, I
Khoo, TL
Kondev, FG
Lauritsen, T
Lister, CJ
Seweryniak, D
AF Zhu, S.
Carpenter, M. P.
Janssens, R. V. F.
Frauendorf, S.
Ahmad, I.
Khoo, T. L.
Kondev, F. G.
Lauritsen, T.
Lister, C. J.
Seweryniak, D.
TI Possible double-octupole phonon band in U-238
SO PHYSICAL REVIEW C
LA English
DT Article
ID COINCIDENCE DATA SETS; CONTRASTING BEHAVIOR; HIGH-SPIN; ISOTOPES;
STATES; ACTINIDES; NUCLEI
AB The level scheme of U-238 has been extended using the so-called unsafe Coulomb excitation technique. One positive-parity band was uncovered for the first time, and its most important features can be related to a double-octupole phonon excitation. This band decays to the known K = 0 octupole band via E1 transitions, with strengths much larger than those to the ground-state band. It also decays to the K = 1 and 2 octupole bands. Comparisons among the proposed zero-, one-, and two-phonon bands in U-238 and those in Pu-240 shed more light on the recently proposed concept of rotationally aligned octupole phonon condensation.
C1 [Zhu, S.; Carpenter, M. P.; Janssens, R. V. F.; Ahmad, I.; Khoo, T. L.; Kondev, F. G.; Lauritsen, T.; Lister, C. J.; Seweryniak, D.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Frauendorf, S.] Univ Notre Dame, Notre Dame, IN 46556 USA.
RP Zhu, S (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA.
RI Carpenter, Michael/E-4287-2015
OI Carpenter, Michael/0000-0002-3237-5734
FU US Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357]
FX This work is supported in part by the US Department of Energy, Office of
Nuclear Physics, under Contract No. DE-AC02-06CH11357.
NR 19
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SN 0556-2813
J9 PHYS REV C
JI Phys. Rev. C
PD APR
PY 2010
VL 81
IS 4
AR 041306
DI 10.1103/PhysRevC.81.041306
PG 5
WC Physics, Nuclear
SC Physics
GA 590FG
UT WOS:000277209500006
ER
PT J
AU Aaltonen, T
Adelman, J
Gonzalez, BA
Amerio, S
Amidei, D
Anastassov, A
Annovi, A
Antos, J
Apollinari, G
Appel, J
Apresyan, A
Arisawa, T
Artikov, A
Asaadi, J
Ashmanskas, W
Attal, A
Aurisano, A
Azfar, F
Badgett, W
Barbaro-Galtieri, A
Barnes, VE
Barnett, BA
Barria, P
Bartos, P
Bauer, G
Beauchemin, PH
Bedeschi, F
Beecher, D
Behari, S
Bellettini, G
Bellinger, J
Benjamin, D
Beretvas, A
Bhatti, A
Binkley, M
Bisello, D
Bizjak, I
Blair, RE
Blocker, C
Blumenfeld, B
Bocci, A
Bodek, A
Boisvert, V
Bortoletto, D
Boudreau, J
Boveia, A
Brau, B
Bridgeman, A
Brigliadori, L
Bromberg, C
Brubaker, E
Budagov, J
Budd, HS
Budd, S
Burkett, K
Busetto, G
Bussey, P
Buzatu, A
Byrum, KL
Cabrera, S
Calancha, C
Camarda, S
Campanelli, M
Campbell, M
Canelli, F
Canepa, A
Carls, B
Carlsmith, D
Carosi, R
Carrillo, S
Carron, S
Casal, B
Casarsa, M
Castro, A
Catastini, P
Cauz, D
Cavaliere, V
Cavalli-Sforza, M
Cerri, A
Cerrito, L
Chang, SH
Chen, YC
Chertok, M
Chiarelli, G
Chlachidze, G
Chlebana, F
Cho, K
Chokheli, D
Chou, JP
Chung, K
Chung, WH
Chung, YS
Chwalek, T
Ciobanu, CI
Ciocci, MA
Clark, A
Clark, D
Compostella, G
Convery, ME
Conway, J
Corbo, M
Cordelli, M
Cox, CA
Cox, DJ
Crescioli, F
Almenar, CC
Cuevas, J
Culbertson, R
Cully, JC
Dagenhart, D
d'Ascenzo, N
Datta, M
Davies, T
de Barbaro, P
De Cecco, S
Deisher, A
De Lorenzo, G
Dell'Orso, M
Deluca, C
Demortier, L
Deng, J
Deninno, M
d'Errico, M
Di Canto, A
Di Ruzza, B
Dittmann, JR
D'Onofrio, M
Donati, S
Dong, P
Dorigo, T
Dube, S
Ebina, K
Elagin, A
Erbacher, R
Errede, D
Errede, S
Ershaidat, N
Eusebi, R
Fang, HC
Farrington, S
Fedorko, WT
Feild, RG
Feindt, M
Fernandez, JP
Ferrazza, C
Field, R
Flanagan, G
Forrest, R
Frank, MJ
Franklin, M
Freeman, JC
Furic, I
Gallinaro, M
Galyardt, J
Garberson, F
Garcia, JE
Garfinkel, AF
Garosi, P
Gerberich, H
Gerdes, D
Gessler, A
Giagu, S
Giakoumopoulou, V
Giannetti, P
Gibson, K
Gimmell, JL
Ginsburg, CM
Giokaris, N
Giordani, M
Giromini, P
Giunta, M
Giurgiu, G
Glagolev, V
Glenzinski, D
Gold, M
Goldschmidt, N
Golossanov, A
Gomez, G
Gomez-Ceballos, G
Goncharov, M
Gonzalez, O
Gorelov, I
Goshaw, AT
Goulianos, K
Gresele, A
Grinstein, S
Grosso-Pilcher, C
Group, RC
Grundler, U
da Costa, JG
Gunay-Unalan, Z
Haber, C
Hahn, SR
Halkiadakis, E
Han, BY
Han, JY
Happacher, F
Hara, K
Hare, D
Hare, M
Harr, RF
Hartz, M
Hatakeyama, K
Hays, C
Heck, M
Heinrich, J
Herndon, M
Heuser, J
Hewamanage, S
Hidas, D
Hill, CS
Hirschbuehl, D
Hocker, A
Hou, S
Houlden, M
Hsu, SC
Hughes, RE
Hurwitz, M
Husemann, U
Hussein, M
Huston, J
Incandela, J
Introzzi, G
Iori, M
Ivanov, A
James, E
Jang, D
Jayatilaka, B
Jeon, EJ
Jha, MK
Jindariani, S
Johnson, W
Jones, M
Joo, KK
Jun, SY
Jung, JE
Junk, TR
Kamon, T
Kar, D
Karchin, PE
Kato, Y
Kephart, R
Ketchum, W
Keung, J
Khotilovich, V
Kilminster, B
Kim, DH
Kim, HS
Kim, HW
Kim, JE
Kim, MJ
Kim, SB
Kim, SH
Kim, YK
Kimura, N
Kirsch, L
Klimenko, S
Kondo, K
Kong, DJ
Konigsberg, J
Korytov, A
Kotwal, AV
Kreps, M
Kroll, J
Krop, D
Krumnack, N
Kruse, M
Krutelyov, V
Kuhr, T
Kulkarni, NP
Kurata, M
Kwang, S
Laasanen, AT
Lami, S
Lammel, S
Lancaster, M
Lander, RL
Lannon, K
Lath, A
Latino, G
Lazzizzera, I
LeCompte, T
Lee, E
Lee, HS
Lee, JS
Lee, SW
Leone, S
Lewis, JD
Lin, CJ
Linacre, J
Lindgren, M
Lipeles, E
Lister, A
Litvintsev, DO
Liu, C
Liu, T
Lockyer, NS
Loginov, A
Lovas, L
Lucchesi, D
Lueck, J
Lujan, P
Lukens, P
Lungu, G
Lys, J
Lysak, R
MacQueen, D
Madrak, R
Maeshima, K
Makhoul, K
Maksimovic, P
Malde, S
Malik, S
Manca, G
Manousakis-Katsikakis, A
Margaroli, F
Marino, C
Marino, CP
Martin, A
Martin, V
Martinez, M
Martinez-Ballarin, R
Mastrandrea, P
Mathis, M
Mattson, ME
Mazzanti, P
McFarland, KS
McIntyre, P
McNulty, R
Mehta, A
Mehtala, P
Menzione, A
Mesropian, C
Miao, T
Mietlicki, D
Miladinovic, N
Miller, R
Mills, C
Milnik, M
Mitra, A
Mitselmakher, G
Miyake, H
Moed, S
Moggi, N
Mondragon, MN
Moon, CS
Moore, R
Morello, MJ
Morlock, J
Fernandez, PM
Mulmenstadt, J
Mukherjee, A
Muller, T
Murat, P
Mussini, M
Nachtman, J
Nagai, Y
Naganoma, J
Nakamura, K
Nakano, I
Napier, A
Nett, J
Neu, C
Neubauer, MS
Neubauer, S
Nielsen, J
Nodulman, L
Norman, M
Norniella, O
Nurse, E
Oakes, L
Oh, SH
Oh, YD
Oksuzian, I
Okusawa, T
Orava, R
Osterberg, K
Griso, SP
Pagliarone, C
Palencia, E
Papadimitriou, V
Papaikonomou, A
Paramanov, AA
Parks, B
Pashapour, S
Patrick, J
Pauletta, G
Paulini, M
Paus, C
Peiffer, T
Pellett, DE
Penzo, A
Phillips, TJ
Piacentino, G
Pianori, E
Pinera, L
Pitts, K
Plager, C
Pondrom, L
Potamianos, K
Poukhov, O
Prokoshin, F
Pronko, A
Ptohos, F
Pueschel, E
Punzi, G
Pursley, J
Rademacker, J
Rahaman, A
Ramakrishnan, V
Ranjan, N
Redondo, I
Renton, P
Renz, M
Rescigno, M
Richter, S
Rimondi, F
Ristori, L
Robson, A
Rodrigo, T
Rodriguez, T
Rogers, E
Rolli, S
Roser, R
Rossi, M
Rossin, R
Roy, P
Ruiz, A
Russ, J
Rusu, V
Rutherford, B
Saarikko, H
Safonov, A
Sakumoto, WK
Santi, L
Sartori, L
Sato, K
Saveliev, V
Savoy-Navarro, A
Schlabach, P
Schmidt, A
Schmidt, EE
Schmidt, MA
Schmidt, MP
Schmitt, M
Schwarz, T
Scodellaro, L
Scribano, A
Scuri, F
Sedov, A
Seidel, S
Seiya, Y
Semenov, A
Sexton-Kennedy, L
Sforza, F
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Yeh, G. P.
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Yu, G. B.
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CA CDF Collaboration
TI Search for single top quark production in p(p)over-bar collisions at
root s=1.96 TeV in the missing transverse energy plus jets topology
SO PHYSICAL REVIEW D
LA English
DT Article
ID ELECTROMAGNETIC CALORIMETER; PARTON DISTRIBUTIONS; CDF; DETECTOR;
PERFORMANCE; PHYSICS
AB We report a search for single top quark production with the CDF II detector using 2: 1 fb(-1) of integrated luminosity of p (p) over bar collisions at root s = 1.96 TeV. The data selected consist of events characterized by large energy imbalance in the transverse plane and hadronic jets, and no identified electrons and muons, so the sample is enriched in W -> tau nu decays. In order to suppress backgrounds, additional kinematic and topological requirements are imposed through a neural network, and at least one of the jets must be identified as a b quark jet. We measure an excess of signal-like events in agreement with the standard model prediction, but inconsistent with a model without single top quark production by 2.1 standard deviations (sigma), with a median expected sensitivity of 1.4 sigma. Assuming a top quark mass of 175 GeV/c(2) and ascribing the excess to single top quark production, the cross section is measured to be 4.9(-2.2)(+2.5) (stat + syst) pb, consistent with measurements performed in independent data sets and with the standard model prediction.
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[Chwalek, T.; Feindt, M.; Gessler, A.; Heck, M.; Heuser, J.; Hirschbuehl, D.; Kreps, M.; Kuhr, T.; Lueck, J.; Marino, C.; Milnik, M.; Morlock, J.; Muller, Th.; Neubauer, S.; Papaikonomou, A.; Peiffer, T.; Renz, M.; Richter, S.; Schmidt, A.; Wagner, W.; Wagner-Kuhr, J.; Weinelt, J.] Karlsruhe Inst Technol, Inst Expt Kernphys, D-76131 Karlsruhe, Germany.
[Chang, S. H.; Cho, K.; Jeon, E. J.; Joo, K. K.; Jung, J. E.; Kim, D. H.; Kim, H. S.; Kim, H. W.; Kim, J. E.; Kim, S. B.; Kong, D. J.; Lee, J. S.; Moon, C. S.; Oh, Y. D.; Suh, J. S.; Uozumi, S.; Yang, Y. C.; Yu, I.] Kyungpook Natl Univ, Ctr High Energy Phys, Taegu 702701, South Korea.
[Chang, S. H.; Cho, K.; Jeon, E. J.; Joo, K. K.; Jung, J. E.; Kim, D. H.; Kim, H. S.; Kim, H. W.; Kim, J. E.; Kim, S. B.; Kong, D. J.; Lee, J. S.; Moon, C. S.; Oh, Y. D.; Suh, J. S.; Uozumi, S.; Yang, Y. C.; Yu, I.] Seoul Natl Univ, Seoul 151742, South Korea.
[Chang, S. H.; Cho, K.; Jeon, E. J.; Joo, K. K.; Jung, J. E.; Kim, D. H.; Kim, H. S.; Kim, H. W.; Kim, J. E.; Kim, S. B.; Kong, D. J.; Lee, J. S.; Moon, C. S.; Oh, Y. D.; Suh, J. S.; Uozumi, S.; Yang, Y. C.; Yu, I.] Sungkyunkwan Univ, Suwon 440746, South Korea.
[Chang, S. H.; Cho, K.; Jeon, E. J.; Joo, K. K.; Jung, J. E.; Kim, D. H.; Kim, H. S.; Kim, H. W.; Kim, J. E.; Kim, S. B.; Kong, D. J.; Lee, J. S.; Moon, C. S.; Oh, Y. D.; Suh, J. S.; Uozumi, S.; Yang, Y. C.; Yu, I.] Korea Inst Sci & Technol Informat, Taejon 305806, South Korea.
[Chang, S. H.; Cho, K.; Jeon, E. J.; Joo, K. K.; Jung, J. E.; Kim, D. H.; Kim, H. S.; Kim, H. W.; Kim, J. E.; Kim, S. B.; Kong, D. J.; Lee, J. S.; Moon, C. S.; Oh, Y. D.; Suh, J. S.; Uozumi, S.; Yang, Y. C.; Yu, I.] Chonnam Natl Univ, Kwangju 500757, South Korea.
[Chang, S. H.; Cho, K.; Jeon, E. J.; Joo, K. K.; Jung, J. E.; Kim, D. H.; Kim, H. S.; Kim, H. W.; Kim, J. E.; Kim, S. B.; Kong, D. J.; Lee, J. S.; Moon, C. S.; Oh, Y. D.; Suh, J. S.; Uozumi, S.; Yang, Y. C.; Yu, I.] Chonbuk Natl Univ, Jeonju 561756, South Korea.
[Barbaro-Galtieri, A.; Cerri, A.; Deisher, A.; Fang, H. C.; Haber, C.; Hsu, S. -C.; Lin, C. -J.; Lujan, P.; Lys, J.; Muelmenstaedt, J.; Nielsen, J.; Volobouev, I.; Yao, W. M.] Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
[Houlden, M.; Manca, G.; McNulty, R.; Mehta, A.; Shears, T.] Univ Liverpool, Liverpool L69 7ZE, Merseyside, England.
[Beecher, D.; Bizjak, I.; Campanelli, M.; Cerrito, L.; Lancaster, M.; Malik, S.; Nurse, E.; Waters, D.] UCL, London WC1E 6BT, England.
[Calancha, C.; Fernandez, J. P.; Gonzalez, O.; Martinez-Ballarin, R.; Redondo, I.; Ttito-Guzman, P.; Vidal, M.] Ctr Invest Energet Medioambient & Tecnol, E-28040 Madrid, Spain.
[Bauer, G.; Gomez-Ceballos, G.; Goncharov, M.; Makhoul, K.; Paus, C.] MIT, Cambridge, MA 02139 USA.
[Beauchemin, P. -H.; Buzatu, A.; MacQueen, D.; Pashapour, S.; Roy, P.; Sinervo, P.; Snihur, R.; Stelzer, B.; Stelzer-Chilton, O.; Warburton, A.; Williams, G.] McGill Univ, Inst Particle Phys, Montreal, PQ H3A 2T8, Canada.
[Beauchemin, P. -H.; Buzatu, A.; MacQueen, D.; Pashapour, S.; Roy, P.; Sinervo, P.; Snihur, R.; Stelzer, B.; Stelzer-Chilton, O.; Warburton, A.; Williams, G.] Simon Fraser Univ, Burnaby, BC V5A 1S6, Canada.
[Beauchemin, P. -H.; Buzatu, A.; MacQueen, D.; Pashapour, S.; Roy, P.; Sinervo, P.; Snihur, R.; Stelzer, B.; Stelzer-Chilton, O.; Warburton, A.; Williams, G.] Univ Toronto, Toronto, ON M5S 1A7, Canada.
[Beauchemin, P. -H.; Buzatu, A.; MacQueen, D.; Pashapour, S.; Roy, P.; Sinervo, P.; Snihur, R.; Stelzer, B.; Stelzer-Chilton, O.; Warburton, A.; Williams, G.] TRIUMF, Vancouver, BC V6T 2A3, Canada.
[Amidei, D.; Campbell, M.; Cully, J. C.; Gerdes, D.; Mietlicki, D.; Strycker, G. L.; Tecchio, M.; Varganov, A.; Wright, T.] Univ Michigan, Ann Arbor, MI 48109 USA.
[Bromberg, C.; Gunay-Unalan, Z.; Hussein, M.; Huston, J.; Miller, R.; Tollefson, K.] Michigan State Univ, E Lansing, MI 48824 USA.
[Shreyber, I.] Inst Theoret & Expt Phys, Moscow 117259, Russia.
[Gold, M.; Gorelov, I.; Seidel, S.; Strologas, J.; Vogel, M.] Univ New Mexico, Albuquerque, NM 87131 USA.
[Anastassov, A.; Schmitt, M.; Stentz, D.] Northwestern Univ, Evanston, IL 60208 USA.
[Hughes, R. E.; Lannon, K.; Parks, B.; Slaunwhite, J.; Winer, B. L.; Wolfe, H.] Ohio State Univ, Columbus, OH 43210 USA.
[Nakano, I.; Takashima, R.; Tanaka, R.] Okayama Univ, Okayama 7008530, Japan.
[Kato, Y.; Okusawa, T.; Seiya, Y.; Wakisaka, T.; Yamamoto, K.; Yoshida, T.] Osaka City Univ, Osaka 588, Japan.
[Azfar, F.; Farrington, S.; Hays, C.; Linacre, J.; Malde, S.; Oakes, L.; Rademacker, J.; Renton, P.] Univ Oxford, Oxford OX1 3RH, England.
[Amerio, S.; Bisello, D.; Busetto, G.; Compostella, G.; d'Errico, M.; Dorigo, T.; Gresele, A.; Lazzizzera, I.; Lucchesi, D.; Griso, S. Pagan] Ist Nazl Fis Nucl, Sez Padova Trento, I-35131 Padua, Italy.
[Amerio, S.; Bisello, D.; Busetto, G.; d'Errico, M.; Gresele, A.; Lazzizzera, I.; Lucchesi, D.; Griso, S. Pagan] Univ Padua, I-35131 Padua, Italy.
[Ciobanu, C. I.; Corbo, M.; d'Ascenzo, N.; Ershaidat, N.; Saveliev, V.; Savoy-Navarro, A.] Univ Paris 06, CNRS, UMR7585, LPNHE,IN2P3, F-75252 Paris, France.
[Canepa, A.; Heinrich, J.; Keung, J.; Kroll, J.; Lipeles, E.; Lockyer, N. S.; Neu, C.; Pianori, E.; Rodriguez, T.; Thomson, E.; Tu, Y.; Wagner, P.; Whiteson, D.; Williams, H. H.] Univ Penn, Philadelphia, PA 19104 USA.
[Barria, P.; Bedeschi, F.; Bellettini, G.; Carosi, R.; Catastini, P.; Cavaliere, V.; Chiarelli, G.; Ciocci, M. A.; Crescioli, F.; Dell'Orso, M.; Di Canto, A.; Di Ruzza, B.; Donati, S.; Ferrazza, C.; Garosi, P.; Giannetti, P.; Giunta, M.; Introzzi, G.; Lami, S.; Latino, G.; Leone, S.; Menzione, A.; Morello, M. J.; Piacentino, G.; Punzi, G.; Ristori, L.; Sartori, L.; Scribano, A.; Scuri, F.; Sforza, F.; Squillacioti, P.; Trovato, M.; Turini, N.; Vataga, E.; Volpi, G.] Ist Nazl Fis Nucl, I-56127 Pisa, Italy.
[Bellettini, G.; Crescioli, F.; Dell'Orso, M.; Di Canto, A.; Donati, S.; Punzi, G.; Sforza, F.; Volpi, G.] Univ Pisa, I-56127 Pisa, Italy.
[Barria, P.; Catastini, P.; Cavaliere, V.; Ciocci, M. A.; Garosi, P.; Latino, G.; Scribano, A.; Squillacioti, P.; Turini, N.] Univ Siena, I-56127 Pisa, Italy.
[Ferrazza, C.; Trovato, M.; Vataga, E.] Scuola Normale Super Pisa, I-56127 Pisa, Italy.
[Boudreau, J.; Gibson, K.; Hartz, M.; Liu, C.; Rahaman, A.; Shepard, P. F.] Univ Pittsburgh, Pittsburgh, PA 15260 USA.
[Apresyan, A.; Barnes, V. E.; Bortoletto, D.; Flanagan, G.; Garfinkel, A. F.; Jones, M.; Laasanen, A. T.; Margaroli, F.; Potamianos, K.; Ranjan, N.; Sedov, A.] Purdue Univ, W Lafayette, IN 47907 USA.
[Bodek, A.; Boisvert, V.; Budd, H. S.; Chung, Y. S.; de Barbaro, P.; Gimmell, J. L.; Han, B. -Y.; Han, J. Y.; McFarland, K. S.; Sakumoto, W. K.] Univ Rochester, Rochester, NY 14627 USA.
[Bhatti, A.; Demortier, L.; Gallinaro, M.; Goulianos, K.; Lungu, G.; Mesropian, C.] Rockefeller Univ, New York, NY 10021 USA.
[De Cecco, S.; Giagu, S.; Iori, M.; Mastrandrea, P.; Rescigno, M.] Ist Nazl Fis Nucl, Sez Roma 1, I-00185 Rome, Italy.
[Giagu, S.; Iori, M.] Univ Roma La Sapienza, I-00185 Rome, Italy.
[Dube, S.; Halkiadakis, E.; Hare, D.; Hidas, D.; Lath, A.; Somalwar, S.] Rutgers State Univ, Piscataway, NJ 08855 USA.
[Asaadi, J.; Aurisano, A.; Elagin, A.; Eusebi, R.; Kamon, T.; Khotilovich, V.; Lee, E.; Lee, S. W.; McIntyre, P.; Safonov, A.; Toback, D.; Weinberger, M.] Texas A&M Univ, College Stn, TX 77843 USA.
[Cauz, D.; Giordani, M.; Pagliarone, C.; Pauletta, G.; Penzo, A.; Rossi, M.; Santi, L.; Totaro, P.; Zanetti, A.] Ist Nazl Fis Nucl Trieste Udine, I-34100 Trieste, Italy.
[Giordani, M.; Pauletta, G.; Santi, L.; Totaro, P.] Univ Trieste Udine, I-33100 Udine, Italy.
[Hara, K.; Kim, S. H.; Kurata, M.; Miyake, H.; Nagai, Y.; Naganoma, J.; Nakamura, K.; Sato, K.; Shimojima, M.; Takeuchi, Y.; Tomura, T.; Ukegawa, F.] Univ Tsukuba, Tsukuba, Ibaraki 305, Japan.
[Hare, M.; Napier, A.; Rolli, S.; Sliwa, K.; Whitehouse, B.] Tufts Univ, Medford, MA 02155 USA.
[Arisawa, T.; Ebina, K.; Kimura, N.; Kondo, K.; Yorita, K.] Waseda Univ, Tokyo 169, Japan.
[Harr, R. F.; Karchin, P. E.; Kulkarni, N. P.; Mattson, M. E.; Shalhout, S. Z.] Wayne State Univ, Detroit, MI 48201 USA.
[Bellinger, J.; Carlsmith, D.; Chung, W. H.; Herndon, M.; Nett, J.; Pondrom, L.; Pursley, J.; Ramakrishnan, V.; Shon, Y.] Univ Wisconsin, Madison, WI 53706 USA.
[Almenar, C. Cuenca; Feild, R. G.; Husemann, U.; Loginov, A.; Martin, A.; Schmidt, M. P.; Stanitzki, M.; Tipton, P.] Yale Univ, New Haven, CT 06520 USA.
RP Aaltonen, T (reprint author), Univ Helsinki, Div High Energy Phys, Dept Phys, FIN-00014 Helsinki, Finland.
RI Introzzi, Gianluca/K-2497-2015; Martinez Ballarin, Roberto/K-9209-2015;
Gorelov, Igor/J-9010-2015; Prokoshin, Fedor/E-2795-2012; Canelli,
Florencia/O-9693-2016; Moon, Chang-Seong/J-3619-2014; Scodellaro,
Luca/K-9091-2014; Grinstein, Sebastian/N-3988-2014; Paulini,
Manfred/N-7794-2014; Russ, James/P-3092-2014; unalan,
zeynep/C-6660-2015; vilar, rocio/P-8480-2014; Cabrera Urban,
Susana/H-1376-2015; Garcia, Jose /H-6339-2015; ciocci, maria agnese
/I-2153-2015; Cavalli-Sforza, Matteo/H-7102-2015; Chiarelli,
Giorgio/E-8953-2012; Muelmenstaedt, Johannes/K-2432-2015; Ruiz,
Alberto/E-4473-2011; Robson, Aidan/G-1087-2011; Lysak,
Roman/H-2995-2014; De Cecco, Sandro/B-1016-2012; St.Denis,
Richard/C-8997-2012; manca, giulia/I-9264-2012; Amerio,
Silvia/J-4605-2012; Punzi, Giovanni/J-4947-2012; Zeng, Yu/C-1438-2013;
Annovi, Alberto/G-6028-2012; Ivanov, Andrew/A-7982-2013; Warburton,
Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014
OI Introzzi, Gianluca/0000-0002-1314-2580; Martinez Ballarin,
Roberto/0000-0003-0588-6720; Gorelov, Igor/0000-0001-5570-0133;
Prokoshin, Fedor/0000-0001-6389-5399; Canelli,
Florencia/0000-0001-6361-2117; Moon, Chang-Seong/0000-0001-8229-7829;
Scodellaro, Luca/0000-0002-4974-8330; Grinstein,
Sebastian/0000-0002-6460-8694; Paulini, Manfred/0000-0002-6714-5787;
Russ, James/0000-0001-9856-9155; unalan, zeynep/0000-0003-2570-7611;
ciocci, maria agnese /0000-0003-0002-5462; Chiarelli,
Giorgio/0000-0001-9851-4816; Muelmenstaedt,
Johannes/0000-0003-1105-6678; Ruiz, Alberto/0000-0002-3639-0368; Punzi,
Giovanni/0000-0002-8346-9052; Annovi, Alberto/0000-0002-4649-4398;
Ivanov, Andrew/0000-0002-9270-5643; Warburton,
Andreas/0000-0002-2298-7315;
FU U.S. Department Energy; National Science Foundation; Italian Istituto
Nazionale di Fisica Nucleare; Ministry of Education, Culture, Sports,
Science and Technology of Japan; Natural Sciences and Engineering
Research Council of Canada; National Science Council of the Republic of
China; Swiss National Science Foundation; A.P. Sloan Foundation;
Bundesministerium fur Bildung und Forschung, Germany; World Class
University Program; National Research Foundation of Korea; Science and
Technology Facilities Council; Royal Society, UK; Institut National de
Physique Nucleaire et Physique des Particules/CNRS; Russian Foundation
for Basic Research; Ministerio de Ciencia e Innovacion; Programa
Consolider-Ingenio 2010, Spain; Slovak RD Agency; Academy of Finland
FX We thank the Fermilab staff and the technical staffs of the
participating institutions for their vital contributions. This work was
supported by the U.S. Department Energy and the National Science
Foundation; the Italian Istituto Nazionale di Fisica Nucleare; the
Ministry of Education, Culture, Sports, Science and Technology of Japan;
the Natural Sciences and Engineering Research Council of Canada; the
National Science Council of the Republic of China; the Swiss National
Science Foundation; the A.P. Sloan Foundation; the Bundesministerium fur
Bildung und Forschung, Germany; the World Class University Program, the
National Research Foundation of Korea; the Science and Technology
Facilities Council and the Royal Society, UK; the Institut National de
Physique Nucleaire et Physique des Particules/CNRS; the Russian
Foundation for Basic Research; the Ministerio de Ciencia e Innovacion,
and Programa Consolider-Ingenio 2010, Spain; the Slovak R&D Agency; and
the Academy of Finland.
NR 70
TC 17
Z9 17
U1 2
U2 18
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2470-0010
EI 2470-0029
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 072003
DI 10.1103/PhysRevD.81.072003
PG 24
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900007
ER
PT J
AU Adamson, P
Andreopoulos, C
Arms, KE
Armstrong, R
Auty, DJ
Ayres, DS
Backhouse, C
Barnes, PD
Barr, G
Barrett, WL
Bhattacharya, D
Bishai, M
Blake, A
Bock, GJ
Boehnlein, DJ
Bogert, D
Bower, C
Cavanaugh, S
Chapman, JD
Cherdack, D
Childress, S
Choudhary, BC
Coelho, JAB
Coleman, SJ
Cronin-Hennessy, D
Culling, AJ
Danko, IZ
de Jong, JK
Devenish, NE
Diwan, MV
Dorman, M
Erwin, AR
Escobar, CO
Evans, JJ
Falk, E
Feldman, GJ
Frohne, MV
Gallagher, HR
Godley, A
Goodman, MC
Gouffon, P
Gran, R
Grashorn, EW
Grzelak, K
Habig, A
Harris, D
Harris, PG
Hartnell, J
Hatcher, R
Heller, K
Himmel, A
Holin, A
Hylen, J
Irwin, GM
Isvan, Z
Jaffe, DE
James, C
Jensen, D
Kafka, T
Kasahara, SMS
Kim, JJ
Koizumi, G
Kopp, S
Kordosky, M
Koskinen, DJ
Krahn, Z
Kreymer, A
Lang, K
Ling, J
Litchfield, PJ
Litchfield, RP
Loiacono, L
Lucas, P
Ma, J
Mann, WA
Marshak, ML
Marshall, JS
Mayer, N
McGowan, AM
Mehdiyev, R
Meier, JR
Messier, MD
Metelko, CJ
Michael, DG
Miller, WH
Mishra, SR
Mitchell, J
Moore, CD
Morfin, J
Mualem, L
Mufson, S
Musser, J
Naples, D
Nelson, JK
Newman, HB
Nichol, RJ
Nicholls, TC
Ochoa-Ricoux, JP
Oliver, WP
Osiecki, T
Ospanov, R
Paley, J
Paolone, V
Patterson, RB
Pavlovic, Z
Pawloski, G
Pearce, GF
Petyt, DA
Pittam, R
Plunkett, RK
Rahaman, A
Rameika, RA
Raufer, TM
Rebel, B
Rodrigues, PA
Rosenfeld, C
Rubin, HA
Ryabov, VA
Sanchez, MC
Saoulidou, N
Schneps, J
Schreiner, P
Semenov, VK
Shanahan, P
Smart, W
Smith, C
Sousa, A
Stamoulis, P
Strait, M
Tagg, N
Talaga, RL
Thomas, J
Thomson, MA
Tinti, G
Toner, R
Tsarev, VA
Tzanakos, G
Urheim, J
Vahle, P
Viren, B
Watabe, M
Weber, A
Webb, RC
West, N
White, C
Whitehead, L
Wojcicki, SG
Wright, DM
Yang, T
Zois, M
Zhang, K
Zwaska, R
AF Adamson, P.
Andreopoulos, C.
Arms, K. E.
Armstrong, R.
Auty, D. J.
Ayres, D. S.
Backhouse, C.
Barnes, P. D., Jr.
Barr, G.
Barrett, W. L.
Bhattacharya, D.
Bishai, M.
Blake, A.
Bock, G. J.
Boehnlein, D. J.
Bogert, D.
Bower, C.
Cavanaugh, S.
Chapman, J. D.
Cherdack, D.
Childress, S.
Choudhary, B. C.
Coelho, J. A. B.
Coleman, S. J.
Cronin-Hennessy, D.
Culling, A. J.
Danko, I. Z.
de Jong, J. K.
Devenish, N. E.
Diwan, M. V.
Dorman, M.
Erwin, A. R.
Escobar, C. O.
Evans, J. J.
Falk, E.
Feldman, G. J.
Frohne, M. V.
Gallagher, H. R.
Godley, A.
Goodman, M. C.
Gouffon, P.
Gran, R.
Grashorn, E. W.
Grzelak, K.
Habig, A.
Harris, D.
Harris, P. G.
Hartnell, J.
Hatcher, R.
Heller, K.
Himmel, A.
Holin, A.
Hylen, J.
Irwin, G. M.
Isvan, Z.
Jaffe, D. E.
James, C.
Jensen, D.
Kafka, T.
Kasahara, S. M. S.
Kim, J. J.
Koizumi, G.
Kopp, S.
Kordosky, M.
Koskinen, D. J.
Krahn, Z.
Kreymer, A.
Lang, K.
Ling, J.
Litchfield, P. J.
Litchfield, R. P.
Loiacono, L.
Lucas, P.
Ma, J.
Mann, W. A.
Marshak, M. L.
Marshall, J. S.
Mayer, N.
McGowan, A. M.
Mehdiyev, R.
Meier, J. R.
Messier, M. D.
Metelko, C. J.
Michael, D. G.
Miller, W. H.
Mishra, S. R.
Mitchell, J.
Moore, C. D.
Morfin, J.
Mualem, L.
Mufson, S.
Musser, J.
Naples, D.
Nelson, J. K.
Newman, H. B.
Nichol, R. J.
Nicholls, T. C.
Ochoa-Ricoux, J. P.
Oliver, W. P.
Osiecki, T.
Ospanov, R.
Paley, J.
Paolone, V.
Patterson, R. B.
Pavlovic, Z.
Pawloski, G.
Pearce, G. F.
Petyt, D. A.
Pittam, R.
Plunkett, R. K.
Rahaman, A.
Rameika, R. A.
Raufer, T. M.
Rebel, B.
Rodrigues, P. A.
Rosenfeld, C.
Rubin, H. A.
Ryabov, V. A.
Sanchez, M. C.
Saoulidou, N.
Schneps, J.
Schreiner, P.
Semenov, V. K.
Shanahan, P.
Smart, W.
Smith, C.
Sousa, A.
Stamoulis, P.
Strait, M.
Tagg, N.
Talaga, R. L.
Thomas, J.
Thomson, M. A.
Tinti, G.
Toner, R.
Tsarev, V. A.
Tzanakos, G.
Urheim, J.
Vahle, P.
Viren, B.
Watabe, M.
Weber, A.
Webb, R. C.
West, N.
White, C.
Whitehead, L.
Wojcicki, S. G.
Wright, D. M.
Yang, T.
Zois, M.
Zhang, K.
Zwaska, R.
CA MINOS Collaboration
TI Neutrino and antineutrino inclusive charged-current cross section
measurements with the MINOS near detector
SO PHYSICAL REVIEW D
LA English
DT Article
ID NUCLEON STRUCTURE FUNCTIONS; ENERGY-RANGE; MU-N; DISTRIBUTIONS;
SCATTERING; COLLISIONS; GENERATOR; PHYSICS; NOMAD; MODEL
AB The energy dependence of the neutrino-iron and antineutrino-iron inclusive charged-current cross sections and their ratio have been measured using a high-statistics sample with the MINOS near detector exposed to the NuMI beam from the main injector at Fermilab. Neutrino and antineutrino fluxes were determined using a low hadronic energy subsample of charged-current events. We report measurements of nu-Fe ((nu) over bar - Fe) cross section in the energy range 3-50 GeV (5-50 GeV) with precision of 2%-8% (3%-9%) and their ratio which is measured with precision 2%-8%. The data set spans the region from low energy, where accurate measurements are sparse, up to the high-energy scaling region where the cross section is well understood.
C1 [Adamson, P.; Bock, G. J.; Boehnlein, D. J.; Bogert, D.; Childress, S.; Choudhary, B. C.; Harris, D.; Hatcher, R.; Hylen, J.; James, C.; Jensen, D.; Koizumi, G.; Kreymer, A.; Lucas, P.; Moore, C. D.; Morfin, J.; Plunkett, R. K.; Rameika, R. A.; Rebel, B.; Saoulidou, N.; Shanahan, P.; Smart, W.; Zwaska, R.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Ayres, D. S.; Goodman, M. C.; McGowan, A. M.; Sanchez, M. C.; Talaga, R. L.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Stamoulis, P.; Tzanakos, G.; Zois, M.] Univ Athens, Dept Phys, GR-15771 Athens, Greece.
[Frohne, M. V.; Schreiner, P.] Benedictine Univ, Dept Phys, Lisle, IL 60532 USA.
[Bishai, M.; Diwan, M. V.; Jaffe, D. E.; Viren, B.; Whitehead, L.; Zhang, K.] Brookhaven Natl Lab, Upton, NY 11973 USA.
[Choudhary, B. C.; Himmel, A.; Michael, D. G.; Mualem, L.; Newman, H. B.; Ochoa-Ricoux, J. P.; Patterson, R. B.] CALTECH, Lauritsen Lab, Pasadena, CA 91125 USA.
[Blake, A.; Chapman, J. D.; Culling, A. J.; Marshall, J. S.; Mitchell, J.; Thomson, M. A.; Toner, R.] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England.
[Coelho, J. A. B.; Escobar, C. O.] Univ Estadual Campinas, IF UNICAMP, BR-13083970 Campinas, SP, Brazil.
[Cavanaugh, S.; Feldman, G. J.; Sanchez, M. C.; Sousa, A.] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA.
[Frohne, M. V.] Coll Holy Cross, Notre Dame, IN 46556 USA.
[de Jong, J. K.; Rubin, H. A.; White, C.] IIT, Div Phys, Chicago, IL 60616 USA.
[Armstrong, R.; Bower, C.; Mayer, N.; Messier, M. D.; Mufson, S.; Musser, J.; Paley, J.; Urheim, J.] Indiana Univ, Bloomington, IN 47405 USA.
[Dorman, M.; Evans, J. J.; Holin, A.; Kordosky, M.; Koskinen, D. J.; Nichol, R. J.; Smith, C.; Thomas, J.; Vahle, P.] UCL, Dept Phys & Astron, London WC1E 6BT, England.
[Arms, K. E.; Cronin-Hennessy, D.; Grashorn, E. W.; Heller, K.; Kasahara, S. M. S.; Krahn, Z.; Litchfield, P. J.; Marshak, M. L.; McGowan, A. M.; Meier, J. R.; Miller, W. H.; Petyt, D. A.; Strait, M.] Univ Minnesota, Minneapolis, MN 55455 USA.
[Gran, R.; Grashorn, E. W.; Habig, A.; Koskinen, D. J.] Univ Minnesota, Dept Phys, Duluth, MN 55812 USA.
[Tagg, N.] Otterbein Coll, Westerville, OH 43081 USA.
[Backhouse, C.; Barr, G.; de Jong, J. K.; Evans, J. J.; Grzelak, K.; Litchfield, R. P.; Pittam, R.; Raufer, T. M.; Rodrigues, P. A.; Sousa, A.; Tinti, G.; Weber, A.; West, N.] Univ Oxford, Subdept Particle Phys, Oxford OX1 3RH, England.
[Bhattacharya, D.; Danko, I. Z.; Isvan, Z.; Naples, D.; Paolone, V.] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA.
[Andreopoulos, C.; Dorman, M.; Hartnell, J.; Metelko, C. J.; Nicholls, T. C.; Pearce, G. F.; Raufer, T. M.] Rutherford Appleton Lab, Sci & Technol Facil Council, Didcot OX11 0QX, Oxon, England.
[Gouffon, P.] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil.
[Godley, A.; Kim, J. J.; Ling, J.; Mishra, S. R.; Rahaman, A.; Rosenfeld, C.] Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA.
[Irwin, G. M.; Pawloski, G.; Wojcicki, S. G.; Yang, T.] Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
[Auty, D. J.; Devenish, N. E.; Falk, E.; Harris, P. G.; Hartnell, J.] Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, E Sussex, England.
[Watabe, M.; Webb, R. C.] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA.
[Kopp, S.; Lang, K.; Loiacono, L.; Ma, J.; Mehdiyev, R.; Osiecki, T.; Pavlovic, Z.] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA.
[Cherdack, D.; Gallagher, H. R.; Kafka, T.; Mann, W. A.; Oliver, W. P.; Schneps, J.; Tagg, N.] Tufts Univ, Dept Phys, Medford, MA 02155 USA.
[Grzelak, K.] Univ Warsaw, Dept Phys, PL-00681 Warsaw, Poland.
[Coleman, S. J.; Kordosky, M.; Nelson, J. K.; Ospanov, R.; Vahle, P.] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA.
[Barnes, P. D., Jr.; Wright, D. M.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
[Barrett, W. L.] Western Washington Univ, Dept Phys, Bellingham, WA 98225 USA.
[Erwin, A. R.] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA.
[Ryabov, V. A.; Tsarev, V. A.] PN Lebedev Phys Inst, Dept Nucl Phys, Moscow 119991, Russia.
[Semenov, V. K.] Inst High Energy Phys, RU-140284 Protvino, Moscow Region, Russia.
RP Adamson, P (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.
RI Nichol, Ryan/C-1645-2008; Harris, Philip/I-7419-2012; Coelho,
Joao/D-3546-2013; Tinti, Gemma/I-5886-2013; Ryabov,
Vladimir/E-1281-2014; Koskinen, David/G-3236-2014; Evans,
Justin/P-4981-2014; Gouffon, Philippe/I-4549-2012; Ling,
Jiajie/I-9173-2014; Inst. of Physics, Gleb Wataghin/A-9780-2017;
Semenov, Vitaliy/E-9584-2017;
OI Hartnell, Jeffrey/0000-0002-1744-7955; Cherdack,
Daniel/0000-0002-3829-728X; Weber, Alfons/0000-0002-8222-6681; Harris,
Philip/0000-0003-4369-3874; Thomson, Mark/0000-0002-2654-9005; Koskinen,
David/0000-0002-0514-5917; Evans, Justin/0000-0003-4697-3337; Gouffon,
Philippe/0000-0001-7511-4115; Ling, Jiajie/0000-0003-2982-0670; COLEMAN,
STEPHEN/0000-0002-4621-9169
NR 47
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 072002
DI 10.1103/PhysRevD.81.072002
PG 16
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900006
ER
PT J
AU Aoki, S
Ishikawa, KI
Ishizuka, N
Izubuchi, T
Kadoh, D
Kanaya, K
Kuramashi, Y
Namekawa, Y
Okawa, M
Taniguchi, Y
Ukawa, A
Ukita, N
Yamazaki, T
Yoshie, T
AF Aoki, S.
Ishikawa, K. -I.
Ishizuka, N.
Izubuchi, T.
Kadoh, D.
Kanaya, K.
Kuramashi, Y.
Namekawa, Y.
Okawa, M.
Taniguchi, Y.
Ukawa, A.
Ukita, N.
Yamazaki, T.
Yoshie, T.
CA PACS-CS Collaboration
TI Physical point simulation in 2+1 flavor lattice QCD
SO PHYSICAL REVIEW D
LA English
DT Article
ID HYBRID MONTE-CARLO; LOCAL BOSONIC ALGORITHM; DYNAMICAL FERMIONS; PHMC
ALGORITHM; FINITE-VOLUME; MATRIX; QUARKS; STATES
AB We present the results of the physical point simulation in 2 + 1 flavor lattice QCD with the non-perturbatively O(a)-improved Wilson quark action and the Iwasaki gauge action at beta = 9 on a 32(3) x 64 lattice. The physical quark masses together with the lattice spacing is determined with m(pi), m(K) and m(Omega) as physical inputs. There are two key algorithmic ingredients to make possible the direct simulation at the physical point: One is the mass-preconditioned domain-decomposed HMC algorithm to reduce the computational cost. The other is the reweighting technique to adjust the hopping parameters exactly to the physical point. The physics results include the hadron spectrum, the quark masses and the pseudo-scalar meson decay constants. The renormalization factors are nonperturbatively evaluated with the Schrodinger functional method. The results are compared with the previous ones obtained by the chiral extrapolation method.
C1 [Aoki, S.; Ishizuka, N.; Kanaya, K.; Kuramashi, Y.; Taniguchi, Y.; Ukawa, A.; Yoshie, T.] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan.
[Aoki, S.; Ishizuka, N.] Brookhaven Natl Lab, Riken BNL Res Ctr, Upton, NY 11973 USA.
[Ishikawa, K. -I.; Kadoh, D.; Kuramashi, Y.; Namekawa, Y.; Taniguchi, Y.; Ukawa, A.; Ukita, N.; Yamazaki, T.; Yoshie, T.] Univ Tsukuba, Ctr Computat Sci, Tsukuba, Ibaraki 3058577, Japan.
[Ishikawa, K. -I.; Okawa, M.] Hiroshima Univ, Grad Sch Sci, Hiroshima 7398526, Japan.
[Izubuchi, T.] Kanazawa Univ, Inst Theoret Phys, Kanazawa, Ishikawa 9201192, Japan.
RP Aoki, S (reprint author), Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan.
RI Ukawa, Akira/A-6549-2011; Kuramashi, Yoshinobu /C-8637-2016
FU Ministry of Education, Culture, Sports, Science and Technology
[16740147, 17340066, 18104005, 18540250, 18740130, 19740134, 20105002,
20340047, 20540248, 20740123, 20740139]
FX Numerical calculations for the present work have been carried out on the
PACS-CS computer under the "Interdisciplinary Computational Science
Program'' of Center for Computational Sciences, University of Tsukuba. A
part of the code development has been carried out on Hitachi SR11000 at
Information Media Center of Hiroshima University and the INSAM
(Institute for Nonlinear Sciences and Applied Mathematics) PC cluster at
Hiroshima University. This work is supported in part by Grants-in-Aid
for Scientific Research from the Ministry of Education, Culture, Sports,
Science and Technology (Nos. 16740147, 17340066, 18104005, 18540250,
18740130, 19740134, 20105002, 20340047, 20540248, 20740123, 20740139).
NR 43
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2470-0010
EI 2470-0029
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074503
DI 10.1103/PhysRevD.81.074503
PG 12
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900057
ER
PT J
AU Arvanitaki, A
Craig, N
Dimopoulos, S
Dubovsky, S
March-Russell, J
AF Arvanitaki, Asimina
Craig, Nathaniel
Dimopoulos, Savas
Dubovsky, Sergei
March-Russell, John
TI String photini at the LHC
SO PHYSICAL REVIEW D
LA English
DT Article
ID MILLICHARGED PARTICLES; SPLIT SUPERSYMMETRY; HADRON COLLIDERS; MEASURING
MASSES; MODULI PROBLEM; NEUTRALINO; BOUNDS; INFLATION; EMISSION
AB String theories with topologically complex compactification manifolds suggest the simultaneous presence of many unbroken U(1)'s without any light matter charged under them. The gauge bosons associated with these U(1)'s do not have direct observational consequences. However, in the presence of low energy supersymmetry the gauge fermions associated with these U(1)'s, the "photini,'' mix with the bino and extend the minimal supersymmetric standard model neutralino sector. This leads to novel signatures at the LHC. The lightest ordinary supersymmetric particle (LOSP) can decay to any one of these photini. In turn, photini may transition into each other, leading to high lepton and jet multiplicities. Both the LOSP decays and interphotini transitions can lead to displaced vertices. When the interphotini decays happen outside the detector, the cascades can result in different photini escaping the detector, leading to multiple reconstructed masses for the invisible particle. If the LOSP is charged, it stops in the detector and decays out of time to photini, with the possibility that the produced final photini vary from event to event. Observation of a plenitude of photini at the LHC would be evidence that we live in a string vacuum with a topologically rich compactification manifold.
C1 [Arvanitaki, Asimina] Univ Calif Berkeley, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA.
[Arvanitaki, Asimina] Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA.
[Craig, Nathaniel; Dimopoulos, Savas; Dubovsky, Sergei] Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
[Dubovsky, Sergei] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia.
[March-Russell, John] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford, England.
RP Arvanitaki, A (reprint author), Univ Calif Berkeley, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA.
FU EC [MRTN-CT-2004-503369]; EU [MPRN-CT-2006-035863]; STFC
FX We thank A. Barr, J. Conlon, H. Jockers, S. Kachru, E. Palti, E.
Silverstein, and S. Shenker for helpful conversations, as well as the
Dalitz Institute for Fundamental Physics and the Department of
Theoretical Physics, Oxford University for hospitality during the course
of this work. J. M. R. is partially supported by the EC Network 6th
Framework Programme Research and Training Network Quest for Unification
(MRTN-CT-2004-503369), by the EU FP6 Marie Curie Research and Training
Network UniverseNet (MPRN-CT-2006-035863), and by the STFC.
NR 42
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2470-0010
EI 2470-0029
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 075018
DI 10.1103/PhysRevD.81.075018
PG 14
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900078
ER
PT J
AU Arvanitaki, A
AF Arvanitaki, Asimina
TI Discovering chiral Higgsinos at the CERN LHC
SO PHYSICAL REVIEW D
LA English
DT Article
ID SUPERSYMMETRY; PHENOMENOLOGY; PARTICLES; SEARCH; MODELS
AB The concept of chirality is extended to the minimal supersymmetric standard model and the mu-term is forbidden by a gauged U(1)' symmetry. R-parity automatically emerges after symmetry breaking, suppressing proton decay and protecting the lightest supersymmetric particle. Exotics charged under the standard model pose a challenge to traditional SU(5) unification, but unification is still implemented in deconstructed grand unified theories. Because of the multitude of additional states to the minimal supersymmetric standard model, the Z' has a large width, and the standard model background, neglected in previous theoretical studies, becomes important for Z' discovery. As a result, the CERN LHC reach is reduced from 3.2 TeV, for a Z' with standard model decays, to 1.5 TeV, when additional decay channels are included. This model also predicts possibly long-lived colored and electroweak exotics.
C1 [Arvanitaki, Asimina] Stanford Univ, Inst Theoret Phys, Stanford, CA 94305 USA.
[Arvanitaki, Asimina] Stanford Linear Accelerator Ctr, Theory Grp, Menlo Pk, CA 94025 USA.
RP Arvanitaki, A (reprint author), Stanford Univ, Inst Theoret Phys, Stanford, CA 94305 USA.
NR 32
TC 1
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2470-0010
EI 2470-0029
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 075008
DI 10.1103/PhysRevD.81.075008
PG 9
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900068
ER
PT J
AU Avakian, H
Efremov, AV
Schweitzer, P
Yuan, F
AF Avakian, H.
Efremov, A. V.
Schweitzer, P.
Yuan, F.
TI Transverse momentum dependent distribution functions in the bag model
SO PHYSICAL REVIEW D
LA English
DT Article
ID DEEP-INELASTIC-SCATTERING; SINGLE-SPIN ASYMMETRIES; WANDZURA-WILCZEK
APPROXIMATION; POLARIZED STRUCTURE FUNCTIONS; FINAL-STATE INTERACTIONS;
QUARK-SOLITON MODEL; DRELL-YAN PROCESSES; SEMIINCLUSIVE PION
ELECTROPRODUCTION; PARTON DISTRIBUTION-FUNCTIONS; LORENTZ INVARIANCE
RELATIONS
AB Leading and subleading-twist transverse momentum dependent parton distribution functions (TMDs) are studied in a quark-model framework provided by the bag model. A complete set of relations among different TMDs is derived, and the question is discussed how model (in) dependent such relations are. A connection of the pretzelosity distribution and quark orbital angular momentum is derived. Numerical results are presented, and applications for phenomenology are discussed. In particular, it is shown that in the valence-x region the bag model supports a Gaussian Ansatz for the transverse momentum dependence of TMDs.
C1 [Avakian, H.] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
[Efremov, A. V.] Joint Inst Nucl Res, Dubna 141980, Russia.
[Schweitzer, P.] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA.
[Yuan, F.] RIKEN BNL Res Ctr, BNL, Upton, NY 11973 USA.
[Yuan, F.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
RP Avakian, H (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
RI Yuan, Feng/N-4175-2013
FU RFBR [09-02-01149, 07-02-91557]; RF MSE RNP [2.1.1/2512]; JINR; DOE
under Jefferson Science Associates, LLC [DE-AC05-06OR23177]; RIKEN;
Brookhaven National Laboratory; U.S. Department of Energy
[DE-AC02-98CH10886]
FX A. E. is supported by Grants No. RFBR 09-02-01149 and 07-02-91557, No.
RF MSE RNP 2.1.1/2512 (MIREA) and by the Heisenberg-Landau Program of
JINR. The work was supported in part by DOE Contract No.
DE-AC05-06OR23177, under which Jefferson Science Associates, LLC,
operates the Jefferson Lab. F.Y. is grateful to RIKEN, Brookhaven
National Laboratory, and the U.S. Department of Energy (Contract No.
DE-AC02-98CH10886) for providing the facilities essential for the
completion of this work.
NR 202
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074035
DI 10.1103/PhysRevD.81.074035
PG 21
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900053
ER
PT J
AU Campbell, JM
Ellis, RK
Williams, C
AF Campbell, John M.
Ellis, R. Keith
Williams, Ciaran
TI Hadronic production of a Higgs boson and two jets at next-to-leading
order
SO PHYSICAL REVIEW D
LA English
DT Article
ID WEAK INTERACTIONS; HIGH-ENERGIES; PHYSICS; DECAYS; MASS
AB We perform an update of the next-to-leading order calculation of the rate for Higgs boson production in association with two jets. Our new calculation incorporates the full analytic result for the one-loop virtual amplitude. This new theoretical information allows us to construct a code including the decay of the Higgs boson without incurring a prohibitive penalty in computer running time. Results are presented for the Tevatron, where implications for the Higgs search are sketched, and also for a range of scenarios at the LHC.
C1 [Campbell, John M.; Ellis, R. Keith] Fermilab Natl Accelerator Lab, Theory Dept, Batavia, IL 60510 USA.
[Williams, Ciaran] Univ Durham, Dept Phys, Durham DH1 3LE, England.
RP Campbell, JM (reprint author), Fermilab Natl Accelerator Lab, Theory Dept, POB 500, Batavia, IL 60510 USA.
FU Fermi Research Alliance, LLC [DE-AC02-07CH11359]
FX We would like to thank Babis Anastasiou, Massimiliano Grazzini, and
Giulia Zanderighi for useful discussions. C. W. acknowledges STFC for
support. Fermilab is operated by the Fermi Research Alliance, LLC under
Contract No. DE-AC02-07CH11359 with the United States Department of
Energy.
NR 37
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074023
DI 10.1103/PhysRevD.81.074023
PG 7
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900041
ER
PT J
AU Cheng, HY
Chiang, CW
AF Cheng, Hai-Yang
Chiang, Cheng-Wei
TI Hadronic D decays involving even-parity light mesons
SO PHYSICAL REVIEW D
LA English
DT Article
ID AXIAL-VECTOR MESONS; 2-BODY CHARM DECAYS; QUARK-MODEL; PI(-)PI(+)PI(+)
DECAY; MULTIQUARK HADRONS; NONLEPTONIC DECAYS; FAVORED DECAYS; SCALAR
MESONS; DALITZ PLOTS; WEAK DECAYS
AB We study the hadronic D meson decays into a pseudoscalar meson P and an even-parity meson M, where M represents a scalar meson S, an axial-vector meson A, or a tensor meson T. These decays are first analyzed in the flavor-diagram approach. Fits to the SP modes with S being a nonstrange scalar meson show that neither the simple q (q) over bar picture nor the q(2)(q) over bar (2) scheme is favored by data. Current measurements on the AP decays are insufficient for a meaningful analysis. Some TP data are inconsistent with the others. In certain cases, the W-annihilation diagrams indicated by the data are unexpectedly large. As a comparison, we also compute their decay rates in the factorization approach using form factors extracted from the covariant light-front model. We find that factorization works well for Cabibbo-allowed D(+) -> SP, AP decays free of the weak annihilation contributions (W-exchange or W-annihilation). For the other SP and AP modes, it is necessary to include weak annihilation contributions to account for the data. However, factorization fails for D -> TP decays for some unknown reason; the predicted rates are in general too small by at least 2 orders of magnitude compared to experiment. We also examine the finite-width effects of resonances. Some decay modes which are kinematically forbidden become physically allowed due to the finite width of the resonance. We show that the branching fraction of D(+) -> sigma pi(+) extracted from three-body decays is enhanced by a factor of 2, whereas B(D(0) -> f(2)(1270)(K) over bar (0)) is reduced by a factor of 4 by finite-width effects.
C1 [Cheng, Hai-Yang; Chiang, Cheng-Wei] Acad Sinica, Inst Phys, Taipei 115, Taiwan.
[Cheng, Hai-Yang] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
[Chiang, Cheng-Wei] Natl Cent Univ, Dept Phys, Chungli 320, Taiwan.
[Chiang, Cheng-Wei] Natl Cent Univ, Ctr Math & Theoret Phys, Chungli 320, Taiwan.
RP Cheng, HY (reprint author), Acad Sinica, Inst Phys, Taipei 115, Taiwan.
OI Chiang, Cheng-Wei/0000-0003-1716-0169
FU National Science Council of Taiwan, R.O.C [972112-M-008-002-MY3, NSC
97-2112-M-001-004MY3]; NCTS
FX H.-Y.C. wishes to thank the hospitality of the Physics Department,
Brookhaven National Laboratory. This research was supported in part by
the National Science Council of Taiwan, R.O.C. under Grants. No NSC
972112-M-008-002-MY3, No. NSC 97-2112-M-001-004MY3, and in part by the
NCTS.
NR 89
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074031
DI 10.1103/PhysRevD.81.074031
PG 19
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900049
ER
PT J
AU Cheng, HY
Chiang, CW
AF Cheng, Hai-Yang
Chiang, Cheng-Wei
TI Two-body hadronic charmed meson decays
SO PHYSICAL REVIEW D
LA English
DT Article
ID FINAL-STATE INTERACTIONS; WEAK NONLEPTONIC DECAYS; QUARK-DIAGRAM SCHEME;
LOW-LYING GLUEBALLS; PI-PI DECAYS; CP VIOLATION; B-MESONS; QCD
FACTORIZATION; SYMMETRY-BREAKING; HAIRPIN DIAGRAM
AB In this work we study the two-body hadronic charmed meson decays, including both the PP and VP modes. The latest experimental data are first analyzed in the diagrammatic approach. The magnitudes and strong phases of the flavor amplitudes are extracted from the Cabibbo-favored decay modes using chi(2) minimization. The best-fitted values are then used to predict the branching fractions of the singly Cabibbo-suppressed and doubly Cabibbo-suppressed decay modes in the flavor SU(3) symmetry limit. We observe significant SU(3) breaking effects in some of the singly Cabibbo-suppressed channels. In the case of VP modes, we point out that the A(P) and A(V) amplitudes cannot be completely determined based on currently available data. We conjecture that the quoted experimental results for both D(s)(+) -> (K) over bar (0)K*(+) and D(s)(+) -> rho+eta' are overestimated. We compare the sizes of color-allowed and color-suppressed tree amplitudes extracted from the diagrammatical approach with the effective parameters a(1) and a(2) defined in the factorization approach. The ratio vertical bar a(2)/a(1)vertical bar is more or less universal among the D -> (K) over bar pi, (K) over bar*pi, and (K) over bar rho modes. This feature allows us to discriminate between different solutions of topological amplitudes. For the long-standing puzzle about the ratio Gamma(D(0) -> K(+)K(-))/Gamma(D(0) -> pi(+)pi(-)), we argue that, in addition to the SU( 3) breaking effect in the spectator amplitudes, the long-distance resonant contribution through the nearby resonance f(0)(1710) can naturally explain why D(0) decays more copiously to K(+)K(-) than pi(+)pi(-) through the W-exchange topology. This has to do with the dominance of the scalar glueball content of f(0)(1710) and the chiral-suppression effect in the decay of a scalar glueball into two pseudoscalar mesons. The same final-state interaction also explains the occurrence of D(0) -> K(0)(K) over bar (0) and its vanishing amplitude when SU(3) flavor symmetry is exact. Owing to the G-parity selection rule, D(s)(+) -> pi(+)omega does not receive contributions from the short-distance W-annihilation and resonant final-state interactions, but it can proceed through the weak decays D(s)(+) -> rho(+)eta(()'()) followed by the final-state rescattering of rho+eta(()'()) into pi(+)omega through quark exchange.
C1 [Cheng, Hai-Yang; Chiang, Cheng-Wei] Acad Sinica, Inst Phys, Taipei 115, Taiwan.
[Cheng, Hai-Yang] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
[Chiang, Cheng-Wei] Natl Cent Univ, Ctr Math & Theoret Phys, Chungli 320, Taiwan.
[Chiang, Cheng-Wei] Natl Cent Univ, Dept Phys, Chungli 320, Taiwan.
RP Cheng, HY (reprint author), Acad Sinica, Inst Phys, Taipei 115, Taiwan.
OI Chiang, Cheng-Wei/0000-0003-1716-0169
FU National Science Council of Taiwan, Republic of China [NSC
97-2112-M-008-002-MY3, NSC 97-2112-M-001-004-MY3]; NCTS
FX We are grateful to B. Bhattacharya for useful communications. One of us
(H.-Y.C.) wishes to thank the hospitality of the Physics Department,
Brookhaven National Laboratory. This research was supported in part by
the National Science Council of Taiwan, Republic of China under Grant
No. NSC 97-2112-M-008-002-MY3 and No. NSC 97-2112-M-001-004-MY3 and in
part by the NCTS.
NR 93
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074021
DI 10.1103/PhysRevD.81.074021
PG 18
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900039
ER
PT J
AU Close, F
Downum, C
Thomas, CE
AF Close, Frank
Downum, Clark
Thomas, Christopher E.
TI Novel charmonium and bottomonium spectroscopies due to deeply bound
hadronic molecules from single pion exchange
SO PHYSICAL REVIEW D
LA English
DT Article
ID QUARK-MODEL; HEAVY MESONS; DECAYS; STATES
AB Pion exchange in S-wave between hadrons that are themselves in a relative S-wave is shown to shift energies by hundreds of MeV, leading to deeply bound quasimolecular states. In the case of charmed mesons D*, D(1) a spectroscopy arises consistent with enigmatic charmonium states observed above 4 GeV in e(+)e(-) annihilation. A possible explanation of Y(4260) -> psi pi pi and Y(4360) -> psi'pi pi is found. We give results for all isospin and charge-conjugation combinations, and comment on flavor exotic doubly charmed states and bottomonium analogs. A search in D (D) over bar3 pi is recommended to test this hypothesis. An exotic 1(-+) is predicted to occur in the vicinity of the Y(4260).
C1 [Close, Frank] Univ Oxford, Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3NP, England.
[Downum, Clark] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England.
[Thomas, Christopher E.] Jefferson Lab, Newport News, VA 23606 USA.
RP Close, F (reprint author), Univ Oxford, Rudolf Peierls Ctr Theoret Phys, 1 Keble Rd, Oxford OX1 3NP, England.
EM f.close1@physics.ox.ac.uk; c.downum1@physics.ox.ac.uk; thomasc@jlab.org
FU Science & Technology Facilities Council (UK); EU [MRTN-CT-2006-035482];
U.S. DOE [DE-AC05-06OR23177]
FX One of us (F. E. C.) thanks J. Dudek for a question at a Jefferson Lab
seminar, which stimulated some of this work, and T. Burns for
discussion. This work is supported by grants from the Science &
Technology Facilities Council (UK), in part by EU Contract No.
MRTN-CT-2006-035482, "FLAVIAnet,'' and in part authored by Jefferson
Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
NR 22
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074033
DI 10.1103/PhysRevD.81.074033
PG 12
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900051
ER
PT J
AU Dawson, S
Jaiswal, P
AF Dawson, S.
Jaiswal, P.
TI Weak corrections to associated Higgs-bottom quark production
SO PHYSICAL REVIEW D
LA English
DT Article
ID RADIATIVE-CORRECTIONS; STANDARD MODEL; HADRON COLLIDERS; ELECTROWEAK
CORRECTIONS; PARTON DISTRIBUTIONS; BOSON PRODUCTION; QCD CORRECTIONS;
DECAY; MASS; SCALAR
AB In models with an enhanced coupling of the Higgs boson to the bottom quark, the dominant production mechanism in hadronic collisions is often the partonic subprocess, bg -> bH. We derive the weak corrections to this process and show that they can be accurately approximated by an "improved Born approximation.'' At the Tevatron, these corrections are negligible and are dwarfed by PDF and scale uncertainties for M-H < 200 GeV. At the LHC, the weak corrections are small for MH < 500 GeV. For large Higgs boson masses, the corrections become significant and are similar to 18% for M-H similar to 1 TeV at root s = 10 TeV.
C1 [Dawson, S.; Jaiswal, P.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
[Jaiswal, P.] SUNY Stony Brook, Yang Inst Theoret Phys, Stony Brook, NY 11790 USA.
RP Dawson, S (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
OI Jaiswal, Prerit/0000-0001-9208-419X; Dawson, Sally/0000-0002-5598-695X
FU United States Department of Energy [DE-AC02-8CH10886]
FX We thank Chris Jackson, Laura Reina, Christian Sturm, and Doreen
Wackeroth for many helpful discussions. This work is supported by the
United States Department of Energy under Grant No. DE-AC02-8CH10886.
NR 49
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 073008
DI 10.1103/PhysRevD.81.073008
PG 11
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900016
ER
PT J
AU Gao, YY
Gritsan, AV
Guo, ZJ
Melnikov, K
Schulze, M
Tran, NV
AF Gao, Yanyan
Gritsan, Andrei V.
Guo, Zijin
Melnikov, Kirill
Schulze, Markus
Tran, Nhan V.
TI Spin determination of single-produced resonances at hadron colliders
SO PHYSICAL REVIEW D
LA English
DT Article
ID DECAYS; LHC; ASYMMETRIES; HIERARCHY; PARITY; PAIRS
AB We study the production of a single resonance at the LHC and its decay into a pair of Z bosons. We demonstrate how full reconstruction of the final states allows us to determine the spin and parity of the resonance and restricts its coupling to vector gauge bosons. Full angular analysis is illustrated with the simulation of the production and decay chain, including all spin correlations and the most general couplings of spin-zero, -one, and -two resonances to standard model matter and gauge fields. We note implications for analysis of a resonance decaying to other final states.
C1 [Gao, Yanyan; Gritsan, Andrei V.; Guo, Zijin; Melnikov, Kirill; Schulze, Markus; Tran, Nhan V.] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
[Gao, Yanyan] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
RP Gao, YY (reprint author), Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
FU U.S. NSF [PHY-0644849, PHY-0758083, PHY-0855365]; A.P. Sloan Foundation;
University Research Association; U.S. DOE [DE-AC02-07CH11359]; Johns
Hopkins University (JHU)
FX We wish to thank K. Agashe for discussion of the Kaluza-Klein graviton
models. Several of us would like to thank CMS Collaboration colleagues
for feedback during the regular working group presentations of this
analysis, and, in particular, R. Cousins for discussion of the S
significance estimator. This research is partially supported by the U.S.
NSF under Grant Nos. PHY-0644849, PHY-0758083, and PHY-0855365, by the
A.P. Sloan Foundation, and by the University Research Association. FNAL
is operated by Fermi Research Alliance, LLC under Contract No.
DE-AC02-07CH11359 with the U.S. DOE. We also acknowledge support by the
start-up funds provided by the Johns Hopkins University (JHU).
Calculations reported in this paper were performed on the HOMEWOOD HIGH
PERFORMANCE CLUSTER of the JHU.
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PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 075022
DI 10.1103/PhysRevD.81.075022
PG 27
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900082
ER
PT J
AU Hidaka, Y
Pisarski, RD
AF Hidaka, Yoshimasa
Pisarski, Robert D.
TI Small shear viscosity in the semiquark gluon plasma
SO PHYSICAL REVIEW D
LA English
DT Article
ID T-HOOFT LOOP; FINITE-TEMPERATURE QCD; HEAVY-ION COLLISIONS;
QUANTUM-FIELD THEORY; 3-LOOP FREE-ENERGY; HOT GAUGE-THEORIES;
QUARK-GLUON; TRANSPORT-COEFFICIENTS; PHASE-TRANSITION; POLYAKOV LOOP
AB At nonzero temperature in QCD, about the deconfining phase transition there is a semiquark gluon plasma (semi-QGP), where the expectation value of the (renormalized) Polyakov loop is less than one. This can be modeled by a semiclassical expansion about a constant field for the vector potential, A(0), which is diagonal in color. We compute the shear viscosity in the semi-QGP by using the Boltzmann equation in the presence of this background field. To leading, logarithmic order in weak coupling, the dominant diagrams are given by the usual scattering processes of 2 -> 2 particles. For simplicity we also assume that both the number of colors and flavors are large. Near the critical temperature T-c, where the expectation value of the Polyakov loop is small, the overall density of colored fields decreases according to their color representation, with the density of quarks vanishes linearly with the loop, and that of gluons, quadratically. This decrease in the overall density dominates changes in the transport cross section. As a result, relative to that in the perturbative QGP, near T-c the shear viscosity in the semi-QGP is suppressed by two powers of the Polyakov loop. In a semiclassical expansion, the suppression of colored fields depends only upon which color representation they lie in, and not upon their mass. That light and heavy quarks are suppressed in a common manner may help to explain the behavior of charm quarks at RHIC.
C1 [Hidaka, Yoshimasa] Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan.
[Pisarski, Robert D.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
RP Hidaka, Y (reprint author), Kyoto Univ, Dept Phys, Sakyo Ku, Kyoto 6068502, Japan.
FU Ministry of Education, Culture, Sports, Science and Technology (MEXT) of
Japan; U.S. Department of Energy [DE-AC02-98CH10886]; Alexander von
Humboldt Foundation
FX We would thank Olaf Kaczmarek and Kay Hubner for providing the lattice
data. This research of Y.H. was supported by the Grant-in-Aid for the
Global COE Program "The Next Generation of Physics, Spun from
Universality and Emergence'' from the Ministry of Education, Culture,
Sports, Science and Technology (MEXT) of Japan. This research of R. D.
P. was supported by the U.S. Department of Energy under cooperative
research agreement No. DE-AC02-98CH10886. R. D. P. also thanks the
Alexander von Humboldt Foundation for their support.
NR 264
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2470-0010
EI 2470-0029
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 076002
DI 10.1103/PhysRevD.81.076002
PG 20
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900088
ER
PT J
AU Kamano, H
AF Kamano, Hiroyuki
TI Master formula approach to broken chiral U(3) x U(3) symmetry
SO PHYSICAL REVIEW D
LA English
DT Article
ID PHOTON-EMISSION RATES; LARGE N-C; HADRONIC GAS; TOPOLOGICAL
SUSCEPTIBILITY; CURRENT-ALGEBRA; DILEPTON; BREAKING
AB The master formula approach to chiral symmetry breaking proposed by Yamagishi and Zahed is extended to the U-R(3) x U-L(3) group in which effects of the U-A(1) anomaly and flavor symmetry breaking, m(u) not equal m(d) not equal m(s), are taken into account. New identities for the gluon topological susceptibility and pi(0), eta, eta' -> gamma(()*())gamma(()*()) decays are derived, which embody the consequences of broken chiral symmetry in QCD without relying on any unphysical limits.
C1 Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
RP Kamano, H (reprint author), Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
FU U.S. Department of Energy, Office of Nuclear Physics Division
[DE-AC05-06OR23177]
FX The author would like to thank Dr. C.-H. Lee for sending his note, and
Dr. T. Sato and Dr. C. Thomas for careful reading of the manuscript and
useful comments. This work was supported by the U.S. Department of
Energy, Office of Nuclear Physics Division, under Contract No.
DE-AC05-06OR23177 under which Jefferson Science Associates operates the
Jefferson Lab.
NR 34
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 076004
DI 10.1103/PhysRevD.81.076004
PG 12
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900090
ER
PT J
AU Mahlon, G
Parke, SJ
AF Mahlon, Gregory
Parke, Stephen J.
TI Spin correlation effects in top quark pair production at the LHC
SO PHYSICAL REVIEW D
LA English
DT Article
ID ORDER QCD CORRECTIONS; HADRON COLLIDERS; DECAY
AB At a 14 TeV proton-proton collider, the Large Hadron Collider (LHC), we show that top quark pair production is dominated at low invariant mass by the fusion of two like-helicity gluons, producing top quark pairs in the left-left or right-right helicity configurations. Whereas, at higher invariant mass the production is dominated by the fusion of unlike-helicity gluons, producing top quark pairs in the up-down or down-up off-diagonal configurations, identical to top quark pair production via quark-antiquark annihilation. We study in detail the low invariant mass region, and show that the spin correlations can be easily observed in this region by looking at the distribution of the difference in the azimuthal angles, Delta phi, of the dileptons decay products of the top quarks in the laboratory frame. Because of the large cross section for top pair production at the LHC, even with a cut requiring that the invariant mass of the top quark pair be less than 400 GeV, the approximate yield would be 10(4) dilepton (e, mu) events per fb(-1) before detector efficiencies are applied. Therefore, there is ample statistics to form the Delta phi distribution of the dilepton events, even with the invariant mass restriction. We also discuss possibilities for observing these spin correlations in the lepton plus jets channel.
C1 [Mahlon, Gregory] Penn State Mt Alto, Mt Alto, PA 17237 USA.
[Parke, Stephen J.] Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA.
RP Mahlon, G (reprint author), Penn State Mt Alto, 1 Campus Dr, Mt Alto, PA 17237 USA.
EM gdm10@psu.edu; parke@fnal.gov
OI Parke, Stephen/0000-0003-2028-6782
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PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074024
DI 10.1103/PhysRevD.81.074024
PG 14
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900042
ER
PT J
AU Ramalho, G
Tsushima, K
AF Ramalho, G.
Tsushima, K.
TI Valence quark contributions for the gamma N -> P-11(1440) form factors
SO PHYSICAL REVIEW D
LA English
DT Article
ID ROPER RESONANCE; NUCLEON RESONANCES; MODEL; ELECTROPRODUCTION; DELTA;
TRANSITION; ELECTROEXCITATION; PHOTOPRODUCTION; BARYONS
AB Using a covariant spectator quark model we estimate valence quark contributions to the F-1*(Q(2)) and F-2*(Q(2)) transition form factors for the gamma N -> P-11(1440) reaction. The Roper resonance, P-11(1440), is assumed to be the first radial excitation of the nucleon. The present model requires no extra parameters except for those already fixed by previous studies of the nucleon. Our results are consistent with the experimental data in the high Q(2) region, and those from lattice QCD. We also estimate the meson cloud contributions, focusing on the low Q(2) region, where they are expected to be dominant.
C1 [Ramalho, G.] Ctr Fis Teor Particulas, P-1049001 Lisbon, Portugal.
[Tsushima, K.] Thomas Jefferson Natl Accelerator Facil, Ctr Theory, Newport News, VA 23606 USA.
[Tsushima, K.] Thomas Jefferson Natl Accelerator Facil, EBAC, Newport News, VA 23606 USA.
RP Ramalho, G (reprint author), Ctr Fis Teor Particulas, Av Rovisco Pais, P-1049001 Lisbon, Portugal.
OI Ramalho, Gilberto/0000-0002-9930-659X
NR 58
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074020
DI 10.1103/PhysRevD.81.074020
PG 10
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900038
ER
PT J
AU Torok, A
Beane, SR
Detmold, W
Luu, TC
Orginos, K
Parreno, A
Savage, MJ
Walker-Loud, A
AF Torok, A.
Beane, S. R.
Detmold, W.
Luu, T. C.
Orginos, K.
Parreno, A.
Savage, M. J.
Walker-Loud, A.
CA NPLQCD Collaboration
TI Meson-baryon scattering lengths from mixed-action lattice QCD
SO PHYSICAL REVIEW D
LA English
DT Article
ID ROOTED STAGGERED FERMIONS; CHIRAL PERTURBATION-THEORY; QUANTUM-FIELD
THEORIES; NUCLEON SCATTERING; PIONIC HYDROGEN; ANOMALIES; MATRIX;
SPECTRUM; STATES
AB The pi(+)Sigma(+), pi(+)Xi(0), K(+)p, K(+)n, and (K) over bar (0)Xi(0) scattering lengths are calculated in mixed-action Lattice QCD with domain-wall valence quarks on the asqtad-improved coarse MILC configurations at four light-quark masses, and at two light-quark masses on the fine MILC configurations. Heavy-baryon chiral perturbation theory with two and three flavors of light quarks is used to perform the chiral extrapolations. To the order we work in the three-flavor chiral expansion, the kaon-baryon processes that we investigate show no signs of convergence. Using the two-flavor chiral expansion for extrapolation, the pion-hyperon scattering lengths are found to be a(pi+Sigma+) = -0.197 +/- 0.017 fm, and a(pi+Xi 0) = -0.098 +/- 0.017 fm, where the comprehensive error includes statistical and systematic uncertainties.
C1 [Torok, A.; Beane, S. R.] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA.
[Detmold, W.; Orginos, K.; Walker-Loud, A.] Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA.
[Detmold, W.; Orginos, K.] Jefferson Lab, Newport News, VA 23606 USA.
[Luu, T. C.] Lawrence Livermore Natl Lab, Div N, Livermore, CA 94551 USA.
[Parreno, A.] Univ Barcelona, Inst Ciencies Cosmos, E-08028 Barcelona, Spain.
[Parreno, A.] Univ Barcelona, Dept Estructura & Constituents Mat, E-08028 Barcelona, Spain.
[Savage, M. J.] Univ Washington, Dept Phys, Seattle, WA 98195 USA.
RP Torok, A (reprint author), Univ New Hampshire, Dept Phys, Durham, NH 03824 USA.
OI Detmold, William/0000-0002-0400-8363
FU U.S. Department of Energy [DE-FG03-97ER4014, DE-AC05-06OR23177,
DE-FG02-04ER41302, DE-FG02-07ER41527]; Jeffress Memorial Trust [J-813];
National Science Foundation [PHY-0645570]; University of California,
Lawrence Livermore National Laboratory [W-7405-Eng-48]; EU [FLAVIAnet
MRTN-CT-2006-035482]; MEC (Spain) [FIS2008-01661]; FEDER; Generalitat de
Catalunya [2005SGR-00343]
FX We thank U. G. Meianer for useful discussions, and R. Edwards and B. Joo
for help with the QDP++/Chroma programming environment [71] with which
the calculations discussed here were performed. We gratefully
acknowledge the computational time provided by NERSC (Office of Science
of the U. S. Department of Energy, No. DE-AC02-05CH11231), the Institute
for Nuclear Theory, Centro Nacional de Supercomputacion (Barcelona,
Spain), Lawrence Livermore National Laboratory, and the National Science
Foundation through Teragrid resources provided by the National Center
for Supercomputing Applications and the Texas Advanced Computing Center.
Computational support at Thomas Jefferson National Accelerator Facility
and Fermi National Accelerator Laboratory was provided by the USQCD
collaboration under The Secret Life of a Quark, a U. S. Department of
Energy SciDAC project (http://www.scidac.gov/physics/quarks.html). The
work of M. J. S. was supported in part by the U.S. Department of Energy
under Grant No. DE-FG03-97ER4014. The work of K. O. and W. D. was
supported in part by the U.S. Department of Energy contract No.
DE-AC05-06OR23177 (JSA) and DOE grant DE-FG02-04ER41302. K. O. and A. W.
L. were supported in part by the Jeffress Memorial Trust, grant J-813
and DOE OJI grant DE-FG02-07ER41527. The work of S. R. B. and A. T. was
supported in part by the National Science Foundation CAREER grant No.
PHY-0645570. Part of this work was performed under the auspices of the
US DOE by the University of California, Lawrence Livermore National
Laboratory under Contract No. W-7405-Eng-48. The work of A. P. was
partly supported by the EU contract FLAVIAnet MRTN-CT-2006-035482, by
the contract FIS2008-01661 from MEC (Spain) and FEDER and by the
Generalitat de Catalunya contract 2005SGR-00343.
NR 77
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD APR 1
PY 2010
VL 81
IS 7
AR 074506
DI 10.1103/PhysRevD.81.074506
PG 18
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 590CR
UT WOS:000277201900060
ER
PT J
AU Alexander, FJ
Rosenau, P
AF Alexander, Francis J.
Rosenau, Philip
TI Quasicontinuum Fokker-Planck equation
SO PHYSICAL REVIEW E
LA English
DT Article
ID MASTER EQUATION; DYNAMICS; APPROXIMATION; HYDRODYNAMICS; LATTICES;
CHAINS; TIME
AB Building on the work [C. R. Doering, P. S. Hagan, and P. Rosenau, Phys. Rev. A 36, 985 (1987)] we present a regularized Fokker-Planck equation for discrete-state systems with more accurate short-time behavior than its standard, Kramers-Moyal counterpart. This regularization leads to a quasicontinuum Fokker-Planck equation with several key features: it preserves crucial aspects of state-space discreteness ordinarily lost in the standard Kramers-Moyal expansion; it is well posed, and it is more amenable to analytical and numerical tools currently available for continuum systems. In order to expose the basic idea underlying the regularization, it suffices for us to focus on two simple problems-the chemical reaction kinetics of a one-component system and a two-dimensional symmetric random walk on a square lattice. We then describe the path to applying this approach to more complex, discrete-state stochastic systems.
C1 [Alexander, Francis J.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Rosenau, Philip] Tel Aviv Univ, Sch Math, IL-69978 Tel Aviv, Israel.
RP Alexander, FJ (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
FU Department of Energy [LA-UR 08-05340]; Center for Nonlinear Studies
FX We thank L. Gurvits, B. Munsky, I. M. Nemenman, and M. E. Wall for very
useful discussions. This work, Grant No. LA-UR 08-05340, was carried out
at LANL under the auspices of the Department of Energy. P. R. was
supported in part by the Center for Nonlinear Studies.
NR 33
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U2 0
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1539-3755
J9 PHYS REV E
JI Phys. Rev. E
PD APR
PY 2010
VL 81
IS 4
AR 041902
DI 10.1103/PhysRevE.81.041902
PN 1
PG 5
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 590YY
UT WOS:000277265700086
PM 20481748
ER
PT J
AU Dreyfus, R
Leunissen, ME
Sha, R
Tkachenko, A
Seeman, NC
Pine, DJ
Chaikin, PM
AF Dreyfus, Remi
Leunissen, Mirjam E.
Sha, Roujie
Tkachenko, Alexei
Seeman, Nadrian C.
Pine, David J.
Chaikin, Paul M.
TI Aggregation-disaggregation transition of DNA-coated colloids:
Experiments and theory
SO PHYSICAL REVIEW E
LA English
DT Article
ID SIZED COLLOIDS; CRYSTALLIZATION; THERMODYNAMICS; NANOPARTICLES
AB Colloids coated with complementary single-stranded DNA "sticky ends" associate and dissociate upon heating. Recently, microscopy experiments have been carried out where this association-dissociation transition has been investigated for different types of DNA and different DNA coverages [R. Dreyfus, M. E. Leunissen, R. Sha, A. V. Tkachenko, N. C. Seeman, D. J. Pine, and P. M. Chaikin, Phys. Rev. Lett. 102, 048301 (2009)]. It has been shown that this transition can be described by a simple quantitative model which takes into account the features of the tethered DNA on the particles and unravels the importance of an entropy cost due to DNA confinement between the surfaces. In this paper, we first present an extensive description of the experiments that were carried out. A step-by-step model is then developed starting from the level of statistical mechanics of tethered DNA to that of colloidal aggregates. This model is shown to describe the experiments with excellent agreement for the temperature and width of the transition, which are both essential properties for complex self-assembly processes.
C1 [Dreyfus, Remi; Leunissen, Mirjam E.; Pine, David J.; Chaikin, Paul M.] NYU, Ctr Soft Matter Res, New York, NY 10003 USA.
[Sha, Roujie; Seeman, Nadrian C.] NYU, Dept Chem, New York, NY 10003 USA.
[Tkachenko, Alexei] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
RP Dreyfus, R (reprint author), CNRS Rhodia UPenn UMI 3254, Bristol, PA 19007 USA.
EM remi.dreyfus@gmail.com
RI Tkachenko, Alexei/I-9040-2012; Dreyfus, Remi/H-7028-2013; Pine,
David/B-7740-2016
OI Tkachenko, Alexei/0000-0003-1291-243X; Dreyfus,
Remi/0000-0002-4498-2582; Pine, David/0000-0002-3304-6684
FU Keck Foundation; Nederlandse Organisatie voor Wetenschappelijk Onderzoek
FX We thank J. C. Crocker. M. Clusel, and O. Gang for fruitful discussions.
This work was supported by the Keck Foundation and the Nederlandse
Organisatie voor Wetenschappelijk Onderzoek.
NR 33
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U1 3
U2 44
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1539-3755
J9 PHYS REV E
JI Phys. Rev. E
PD APR
PY 2010
VL 81
IS 4
AR 041404
DI 10.1103/PhysRevE.81.041404
PN 1
PG 10
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 590YY
UT WOS:000277265700062
PM 20481724
ER
PT J
AU Goswami, M
Sumpter, BG
AF Goswami, Monojoy
Sumpter, Bobby G.
TI Anomalous chain diffusion in polymer nanocomposites for varying
polymer-filler interaction strengths
SO PHYSICAL REVIEW E
LA English
DT Article
ID MOLECULAR-DYNAMICS SIMULATIONS; COARSE-GRAINING PROCEDURE;
GLASS-TRANSITION; LENGTH SCALES; THIN-FILM; MELTS; RELAXATION;
EQUIVALENCE; VISCOSITY; CROSSOVER
AB Anomalous diffusion of polymer chains in a polymer nanocomposite melt is investigated for different polymer-nanoparticle interaction strengths using stochastic molecular dynamics simulations. For spherical nanoparticles dispersed in a polymer matrix the results indicate that the chain motion exhibits three distinct regions of diffusion, the Rouse-like motion, an intermediate subdiffusive regime followed by a normal Fickian diffusion. The motion of the chain end monomers shows a scaling that can be attributed to the formation of strong "networklike" structures, which have been seen in a variety of polymer nanocomposite systems. Irrespective of the polymer-particle interaction strengths, these three regimes seem to be present with small deviations. Further investigation on dynamic structure factor shows that the deviations simply exist due to the presence of strong enthalpic interactions between the monomers with the nanoparticles, albeit preserving the anomaly in the chain diffusion. The time-temperature superposition principle is also tested for this system and shows a striking resemblance with systems near glass transition and biological systems with molecular crowding. The universality class of the problem can be enormously important in understanding materials with strong affinity to form either a glass, a gel or networklike structures.
C1 [Goswami, Monojoy; Sumpter, Bobby G.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Goswami, M (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
EM goswamim@ornl.gov; sumpterbg@ornl.gov
RI Goswami, Monojoy/G-7943-2012; Sumpter, Bobby/C-9459-2013
OI Goswami, Monojoy/0000-0002-4473-4888; Sumpter, Bobby/0000-0001-6341-0355
FU Division of Materials Science and Engineering (DMSE), U.S. Department of
Energy (DoE), Office of Basic Energy Sciences (BES) [DEAC05-00OR22725]
FX This work was supported by the Division of Materials Science and
Engineering (DMSE), U.S. Department of Energy (DoE), Office of Basic
Energy Sciences (BES) under Contract No. DEAC05-00OR22725 with
UT-Battelle, LLC at Oak Ridge National Laboratory (ORNL).
NR 73
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U1 3
U2 39
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1539-3755
J9 PHYS REV E
JI Phys. Rev. E
PD APR
PY 2010
VL 81
IS 4
AR 041801
DI 10.1103/PhysRevE.81.041801
PN 1
PG 8
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 590YY
UT WOS:000277265700076
PM 20481738
ER
PT J
AU Nisoli, C
Gabor, NM
Lammert, PE
Maynard, JD
Crespi, VH
AF Nisoli, Cristiano
Gabor, Nathaniel M.
Lammert, Paul E.
Maynard, J. D.
Crespi, Vincent H.
TI Annealing a magnetic cactus into phyllotaxis
SO PHYSICAL REVIEW E
LA English
DT Article
AB The appearance of mathematical regularities in the disposition of leaves on a stem, scales on a pine-cone, and spines on a cactus has puzzled scholars for millennia; similar so-called phyllotactic patterns are seen in self-organized growth, polypeptides, convection, magnetic flux lattices and ion beams. Levitov showed that a cylindrical lattice of repulsive particles can reproduce phyllotaxis under the (unproved) assumption that minimum of energy would be achieved by two-dimensional Bravais lattices. Here we provide experimental and numerical evidence that the Phyllotactic lattice is actually a ground state. When mechanically annealed, our experimental "magnetic cactus" precisely reproduces botanical phyllotaxis, along with domain boundaries (called transitions in Botany) between different phyllotactic patterns. We employ a structural genetic algorithm to explore the more general axially unconstrained case, which reveals multijugate (multiple spirals) as well as monojugate (single-spiral) phyllotaxis.
C1 [Nisoli, Cristiano] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Nisoli, Cristiano] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA.
[Gabor, Nathaniel M.] Cornell Univ, Dept Phys, Ithaca, NY 14853 USA.
[Lammert, Paul E.; Maynard, J. D.; Crespi, Vincent H.] Penn State Univ, Dept Phys, University Pk, PA 16802 USA.
RP Nisoli, C (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
OI Crespi, Vincent/0000-0003-3846-3193; Nisoli,
Cristiano/0000-0003-0053-1023
NR 34
TC 9
Z9 9
U1 0
U2 3
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2470-0045
EI 2470-0053
J9 PHYS REV E
JI Phys. Rev. E
PD APR
PY 2010
VL 81
IS 4
AR 046107
DI 10.1103/PhysRevE.81.046107
PN 2
PG 8
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 590ZA
UT WOS:000277265900010
PM 20481786
ER
PT J
AU Wallace, DC
Chisolm, ED
Bock, N
De Lorenzi-Venneri, G
AF Wallace, Duane C.
Chisolm, Eric D.
Bock, N.
De Lorenzi-Venneri, G.
TI Statistical mechanics model for the transit free energy of monatomic
liquids
SO PHYSICAL REVIEW E
LA English
DT Article
ID MOLECULAR-DYNAMICS; DENSITY FLUCTUATIONS; SODIUM; METALS; RUBIDIUM;
STATE
AB In applying vibration-transit (V-T) theory of liquid dynamics to the thermodynamic properties of monatomic liquids, the point has been reached where an improved model is needed for the small (similar to 10%) transit contribution. Toward this goal, an analysis of the available high-temperature experimental entropy data for elemental liquids was recently completed [D. C. Wallace, E. D. Chisolm, and N. Bock, Phys. Rev. E 79, 051201 (2009)]. This analysis yields a common curve of transit entropy vs T/theta(tr) tr, where T is temperature and theta(tr) is a scaling temperature for each element. In the present paper, a statistical mechanics model is constructed for the transit partition function, and is calibrated to the experimental transit entropy curve. The model has two scalar parameters, and captures the temperature scaling of experiment. The calibrated model fits the experimental liquid entropy to high accuracy at all temperatures. With no additional parameters, the model also agrees with both experiment and molecular dynamics for the internal energy vs. T for Na. With the calibrated transit model, V-T theory provides equations subject to ab initio evaluation for thermodynamic properties of monatomic liquids. This will allow the range of applicability of the theory, and its overall accuracy, to be determined. More generally, the hypothesis of V-T theory, which divides the many-atom potential energy valleys into random and symmetric classes, can also be tested for its application beyond monatomic systems.
C1 [Wallace, Duane C.; Chisolm, Eric D.; Bock, N.; De Lorenzi-Venneri, G.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
RP Wallace, DC (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
FU U.S. Department of Energy [DE-AC52-06NA25396]
FX We appreciate helpful discussions with B. Clements, C. Greeff, and T.
Peery. This work was funded by the U.S. Department of Energy under
Contract No. DE-AC52-06NA25396.
NR 33
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U1 0
U2 0
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1539-3755
J9 PHYS REV E
JI Phys. Rev. E
PD APR
PY 2010
VL 81
IS 4
AR 041201
DI 10.1103/PhysRevE.81.041201
PN 1
PG 8
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 590YY
UT WOS:000277265700048
PM 20481710
ER
PT J
AU Bambade, P
Pons, MA
Amann, J
Angal-Kalinin, D
Apsimon, R
Araki, S
Aryshev, A
Bai, S
Bellomo, P
Bett, D
Blair, G
Bolzon, B
Boogert, S
Boorman, G
Burrows, PN
Christian, G
Coe, P
Constance, B
Delahaye, JP
Deacon, L
Elsen, E
Faus-Golfe, A
Fukuda, M
Gao, J
Geffroy, N
Gianfelice-Wendt, E
Guler, H
Hayano, H
Heo, AY
Honda, Y
Huang, JY
Hwang, WH
Iwashita, Y
Jeremie, A
Jones, J
Kamiya, Y
Karataev, P
Kim, ES
Kim, HS
Kim, SH
Komamiya, S
Kubo, K
Kume, T
Kuroda, S
Lam, B
Lyapin, A
Masuzawa, M
McCormick, D
Molloy, S
Naito, T
Nakamura, T
Nelson, J
Okamoto, D
Okugi, T
Oroku, M
Park, YJ
Parker, B
Paterson, E
Perry, C
Pivi, M
Raubenheimer, T
Renier, Y
Resta-Lopez, J
Rimbault, C
Ross, M
Sanuki, T
Scarfe, A
Schulte, D
Seryi, A
Spencer, C
Suehara, T
Sugahara, R
Swinson, C
Takahashi, T
Tauchi, T
Terunuma, N
Tomas, R
Urakawa, J
Urner, D
Verderi, M
Wang, MH
Warden, M
Wendt, M
White, G
Wittmer, W
Wolski, A
Woodley, M
Yamaguchi, Y
Yamanaka, T
Yan, Y
Yoda, H
Yokoya, K
Zhou, F
Zimmermann, F
AF Bambade, P.
Pons, M. Alabau
Amann, J.
Angal-Kalinin, D.
Apsimon, R.
Araki, S.
Aryshev, A.
Bai, S.
Bellomo, P.
Bett, D.
Blair, G.
Bolzon, B.
Boogert, S.
Boorman, G.
Burrows, P. N.
Christian, G.
Coe, P.
Constance, B.
Delahaye, J. -P.
Deacon, L.
Elsen, E.
Faus-Golfe, A.
Fukuda, M.
Gao, J.
Geffroy, N.
Gianfelice-Wendt, E.
Guler, H.
Hayano, H.
Heo, A. -Y.
Honda, Y.
Huang, J. Y.
Hwang, W. H.
Iwashita, Y.
Jeremie, A.
Jones, J.
Kamiya, Y.
Karataev, P.
Kim, E. -S.
Kim, H. -S.
Kim, S. H.
Komamiya, S.
Kubo, K.
Kume, T.
Kuroda, S.
Lam, B.
Lyapin, A.
Masuzawa, M.
McCormick, D.
Molloy, S.
Naito, T.
Nakamura, T.
Nelson, J.
Okamoto, D.
Okugi, T.
Oroku, M.
Park, Y. J.
Parker, B.
Paterson, E.
Perry, C.
Pivi, M.
Raubenheimer, T.
Renier, Y.
Resta-Lopez, J.
Rimbault, C.
Ross, M.
Sanuki, T.
Scarfe, A.
Schulte, D.
Seryi, A.
Spencer, C.
Suehara, T.
Sugahara, R.
Swinson, C.
Takahashi, T.
Tauchi, T.
Terunuma, N.
Tomas, R.
Urakawa, J.
Urner, D.
Verderi, M.
Wang, M. -H.
Warden, M.
Wendt, M.
White, G.
Wittmer, W.
Wolski, A.
Woodley, M.
Yamaguchi, Y.
Yamanaka, T.
Yan, Y.
Yoda, H.
Yokoya, K.
Zhou, F.
Zimmermann, F.
CA ATF Collaboration
TI Present status and first results of the final focus beam line at the KEK
Accelerator Test Facility
SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
LA English
DT Article
ID COLLIDERS
AB ATF2 is a final-focus test beam line which aims to focus the low emittance beam from the ATF damping ring to a vertical size of about 37 nm and to demonstrate nanometer level beam stability. Several advanced beam diagnostics and feedback tools are used. In December 2008, construction and installation were completed and beam commissioning started, supported by an international team of Asian, European, and U. S. scientists. The present status and first results are described.
C1 [Bambade, P.; Renier, Y.; Rimbault, C.] Univ Paris 11, CNRS, LAL, IN2P3, F-91405 Orsay, France.
[Pons, M. Alabau; Faus-Golfe, A.] Univ Valencia, CSIC, Inst Fis Corpuscular, Valencia, Spain.
[Amann, J.; Bellomo, P.; Lam, B.; McCormick, D.; Nelson, J.; Paterson, E.; Pivi, M.; Raubenheimer, T.; Seryi, A.; Spencer, C.; Wang, M. -H.; White, G.; Wittmer, W.; Woodley, M.; Yan, Y.; Zhou, F.] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA.
[Angal-Kalinin, D.; Jones, J.] Daresbury Lab, STFC, Cockcroft Inst, Warrington, Cheshire, England.
[Apsimon, R.; Bett, D.; Burrows, P. N.; Christian, G.; Coe, P.; Constance, B.; Perry, C.; Resta-Lopez, J.; Swinson, C.; Urner, D.; Warden, M.] John Adams Inst, Oxford, England.
[Bambade, P.; Araki, S.; Aryshev, A.; Fukuda, M.; Hayano, H.; Honda, Y.; Kubo, K.; Kume, T.; Kuroda, S.; Masuzawa, M.; Naito, T.; Okugi, T.; Renier, Y.; Sugahara, R.; Tauchi, T.; Terunuma, N.; Urakawa, J.; Yokoya, K.] High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan.
[Bai, S.; Gao, J.] Inst High Energy Phys, Beijing 100039, Peoples R China.
[Bolzon, B.; Geffroy, N.; Jeremie, A.] Univ Savoie, CNRS, LAPP, IN2P3, Annecy Le Vieux, France.
[Blair, G.; Boogert, S.; Boorman, G.; Deacon, L.; Karataev, P.; Molloy, S.] Royal Holloway Univ London, John Adams Inst, London, England.
[Delahaye, J. -P.; Schulte, D.; Tomas, R.; Zimmermann, F.] CERN, European Org Nucl Res, CH-1211 Geneva, Switzerland.
[Elsen, E.] DESY, Hamburg, Germany.
[Gianfelice-Wendt, E.; Ross, M.; Wendt, M.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Guler, H.; Verderi, M.] Ecole Polytech, CNRS, IN2P3, Lab Leprince Ringuet, F-91128 Palaiseau, France.
[Heo, A. -Y.; Kim, E. -S.; Kim, H. -S.] Kyungpook Natl Univ, Taegu, South Korea.
[Iwashita, Y.] Kyoto ICR, Kyoto, Japan.
[Kamiya, Y.; Komamiya, S.; Nakamura, T.; Oroku, M.; Suehara, T.; Yamaguchi, Y.; Yamanaka, T.; Yoda, H.] Univ Tokyo, Tokyo 1138654, Japan.
[Lyapin, A.] UCL, London, England.
[Okamoto, D.; Sanuki, T.] Tohoku Univ, Sendai, Miyagi 980, Japan.
[Parker, B.] Brookhaven Natl Lab, Upton, NY 11973 USA.
[Scarfe, A.] Univ Manchester, Cockcroft Inst, Manchester M13 9PL, Lancs, England.
[Takahashi, T.] Hiroshima Univ, Hiroshima 730, Japan.
[Wolski, A.] Univ Liverpool, Cockcroft Inst, Liverpool L69 3BX, Merseyside, England.
RP Bambade, P (reprint author), Univ Paris 11, CNRS, LAL, IN2P3, F-91405 Orsay, France.
RI swinson, christina/C-6782-2012; Huang, Jianyu/C-5183-2008; urakawa,
junji/F-4763-2014; Kamiya, Yoshio/L-4394-2014; Aryshev,
Alexander/J-4054-2016; Karataev, Pavel/O-5440-2015;
OI Kamiya, Yoshio/0000-0001-8716-2536; Aryshev,
Alexander/0000-0002-0890-4640; Karataev, Pavel/0000-0002-1961-3793;
Wolski, Andrzej/0000-0002-5057-5588
FU DOE [DE-AC0276SF00515]; JSPS [KAKENHI 17GS0210]; MEXT; French Ministry
of Research [ATF2-IN2P3-KEK, ANR-06-BLAN-0027]; European Commission
[227579]
FX This work is supported by DOE Contract No. DE-AC0276SF00515;
Grant-in-Aid for Creative Scientific Research of JSPS (KAKENHI
17GS0210); U.S.A.-Japan Collaboration Research Grant of MEXT; Agence
Nationale de la Recherche of the French Ministry of Research (Programme
Blanc, Project No. ATF2-IN2P3-KEK, Contract No. ANR-06-BLAN-0027); The
"Toshiko Yuasa'' France Japan Particle Physics Laboratory; Science and
Technology Facilities Council, U.K., and EuCARD project cofunded by the
European Commission within the Framework Program 7, under Grant
Agreement No. 227579.
NR 45
TC 14
Z9 14
U1 2
U2 13
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-4402
J9 PHYS REV SPEC TOP-AC
JI Phys. Rev. Spec. Top.-Accel. Beams
PD APR
PY 2010
VL 13
IS 4
AR 042801
DI 10.1103/PhysRevSTAB.13.042801
PG 10
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 602PG
UT WOS:000278150700009
ER
PT J
AU Ohtsubo, S
Fujioka, M
Higaki, H
Ito, K
Okamoto, H
Sugimoto, H
Lund, SM
AF Ohtsubo, S.
Fujioka, M.
Higaki, H.
Ito, K.
Okamoto, H.
Sugimoto, H.
Lund, S. M.
TI Experimental study of coherent betatron resonances with a Paul trap
SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
LA English
DT Article
ID EXPERIMENTAL BEAM PHYSICS; QUADRUPOLE; PROPAGATION
AB Linear and nonlinear resonant instabilities of charged-particle beams traveling in periodic quadrupole focusing channels are studied experimentally with a compact non-neutral plasma trap. The present experiments are based on the idea that the collective motion of a beam in an accelerator is physically similar to that of a one-component plasma in a trap. A linear Paul trap system named "S-POD'' (simulator for particle orbit dynamics) was developed to explore a variety of space-charge-induced phenomena. To emulate lattice-dependent effects, periodic perturbations are applied to quadrupole electrodes, which gives rise to additional resonance stop bands that shift depending on the plasma density. It is confirmed that an mth-order resonance takes place when the corresponding tune of an mth-order collective mode Omega(m) is close to a half integer.
C1 [Ohtsubo, S.; Fujioka, M.; Higaki, H.; Ito, K.; Okamoto, H.; Sugimoto, H.] Hiroshima Univ, Grad Sch Adv Sci Matter, Higashihiroshima 7398530, Japan.
[Lund, S. M.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Ohtsubo, S (reprint author), Hiroshima Univ, Grad Sch Adv Sci Matter, 1-3-1 Kagamiyama, Higashihiroshima 7398530, Japan.
FU Japan Society for the Promotion of Science; High Energy Accelerator
Research Organization; Lawrence Livermore National Laboratory under U.S.
Department of Energy [DE-AC52-07NA27344]
FX The authors wish to thank A. M. Sessler for his valuable comments on
this paper. We are indebted to D. P. Grote and J.-L. Vay for support
provided on the WARP simulation code. This work was supported in part by
a Grant-in-Aid for Scientific Research, Japan Society for the Promotion
of Science, by the High Energy Accelerator Research Organization, and by
Lawrence Livermore National Laboratory under U.S. Department of Energy
Contract No. DE-AC52-07NA27344.
NR 35
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U2 3
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-4402
J9 PHYS REV SPEC TOP-AC
JI Phys. Rev. Spec. Top.-Accel. Beams
PD APR
PY 2010
VL 13
IS 4
AR 044201
DI 10.1103/PhysRevSTAB.13.044201
PG 12
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 602PG
UT WOS:000278150700011
ER
PT J
AU Rose, DV
Welch, DR
Miller, CL
Clark, RE
Madrid, EA
Mostrom, CB
Wagoner, TC
Moore, JK
Stygar, WA
Bailey, JE
Nash, TJ
Rochau, GA
Sinars, DB
AF Rose, D. V.
Welch, D. R.
Miller, C. L.
Clark, R. E.
Madrid, E. A.
Mostrom, C. B.
Wagoner, T. C.
Moore, J. K.
Stygar, W. A.
Bailey, J. E.
Nash, T. J.
Rochau, G. A.
Sinars, D. B.
TI 10(7)-A load-current B-dot monitor: Simulations, design, and performance
SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
LA English
DT Article
ID PARTICLE-IN-CELL; Z-ACCELERATOR; TRANSPORT; DIODES
AB A B-dot monitor that measures the current 6 cm from the axis of dynamic loads fielded on 10(7)-A multiterawatt pulsed-power accelerators has been developed. The monitor improves upon the multi-megampere load-current gauge described in Phys. Rev. ST Accel. Beams 11, 100401 (2008). The design of the improved monitor was developed using three-dimensional particle-in-cell simulations that model vacuum electron flow in the transmission line near the monitor. The simulations include important geometric features of the B-dot probe and model the deposition of electron energy within the probe. The simulations show that the improved design reduces by as much as a factor of 5 the electron energy deposition to the interior of the monitor. Data taken on accelerator shots demonstrate that the improved monitor works as well as the original monitor on shots with low-impedance loads, and delivers superior performance on higher-impedance-load shots.
C1 [Rose, D. V.; Welch, D. R.; Miller, C. L.; Clark, R. E.; Madrid, E. A.; Mostrom, C. B.] Voss Sci LLC, Albuquerque, NM 87108 USA.
[Wagoner, T. C.; Moore, J. K.] Ktech Corp Inc, Albuquerque, NM 87123 USA.
[Stygar, W. A.; Bailey, J. E.; Nash, T. J.; Rochau, G. A.; Sinars, D. B.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Rose, DV (reprint author), Voss Sci LLC, Albuquerque, NM 87108 USA.
FU United States Department of Energy's National Nuclear Security
Administration [DE-AC04-94-AL85000]
FX The authors are extremely grateful for the sustained support of this
research by J. Porter, K. Matzen, and L. Schneider. We thank K.
Androlewicz for providing the rendering of the ZR MITL system in Fig. 1
and M. Dyson for technical editing. Sandia is a multiprogram laboratory
operated by Sandia Corporation, a Lockheed Martin Company, for the
United States Department of Energy's National Nuclear Security
Administration under Contract No. DE-AC04-94-AL85000.
NR 43
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U1 0
U2 4
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-4402
J9 PHYS REV SPEC TOP-AC
JI Phys. Rev. Spec. Top.-Accel. Beams
PD APR
PY 2010
VL 13
IS 4
AR 040401
DI 10.1103/PhysRevSTAB.13.040401
PG 9
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 602PG
UT WOS:000278150700002
ER
PT J
AU Schwarz, J
Rambo, P
Kimmel, M
Geissel, M
Robertson, G
Ramsey, M
Headley, D
Atherton, B
AF Schwarz, Jens
Rambo, Patrick
Kimmel, Mark
Geissel, Matthias
Robertson, Grafton
Ramsey, Marc
Headley, Daniel
Atherton, Briggs
TI Debris mitigation techniques for petawatt-class lasers in high debris
environments
SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
LA English
DT Article
ID FACILITY; SYSTEM
AB This paper addresses debris mitigation techniques for two different kinds of debris sources that are found in the high-energy density community. The first debris source stems from the laser-target interaction and this debris can be mitigated by avoiding a direct line of sight to the debris source ( e. g. by using a sacrificial fold mirror) or by inserting a thin debris shield. Several thin film debris shields have been investigated and nitrocellulose was found to be the best suited. The second debris source originates from an external high-energy density driver or experiment. In our specific case, this is the Z accelerator, a Z-pinch machine that generates 2 MJ of x rays at 300 TW. The center section of the Z accelerator is an extremely violent environment which requires the development of novel debris mitigation approaches for backlighting with petawatt lasers. Two such approaches are presented in this paper. First, a self-closing focusing cone. In our facility, the focused beam on target is fully enclosed inside a solid focusing cone. In the first debris mitigation scenario, the last part of the cone has a "flapper'' that should seal the cone when the pressure wave from the Z-pinch explosion hits it. In the second scenario, an enclosed target assembly is used, with the last part of the focusing cone connected to a "target can'' which houses the laser target. The laser produced x rays for backlighting escape through a 3 mm diameter hole that is protected by an x-ray filter stack. Both techniques are discussed in detail and have been successfully tested on the Z accelerator.
C1 [Schwarz, Jens; Rambo, Patrick; Kimmel, Mark; Geissel, Matthias; Robertson, Grafton; Ramsey, Marc; Headley, Daniel; Atherton, Briggs] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Schwarz, J (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM jschwar@sandia.gov
RI Ramsey, Marc/E-6412-2011
OI Ramsey, Marc/0000-0002-2290-716X
FU United States Department of Energy's National Nuclear Security
Administration [DE-AC04-94AL85000]
FX Sandia is a multiprogram laboratory operated by Sandia Corporation, a
Lockheed Martin Company, for the United States Department of Energy's
National Nuclear Security Administration under Contract No.
DE-AC04-94AL85000.
NR 16
TC 1
Z9 2
U1 0
U2 1
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-4402
J9 PHYS REV SPEC TOP-AC
JI Phys. Rev. Spec. Top.-Accel. Beams
PD APR
PY 2010
VL 13
IS 4
AR 041001
DI 10.1103/PhysRevSTAB.13.041001
PG 7
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 602PG
UT WOS:000278150700004
ER
PT J
AU Zhang, Y
Allen, CK
Galambos, JD
Holmes, J
Wang, JG
AF Zhang, Y.
Allen, C. K.
Galambos, J. D.
Holmes, J.
Wang, J. G.
TI Transverse beam resonance in the superconducting linac of the Spallation
Neutron Source
SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
LA English
DT Article
AB A weak transverse resonance in the Spallation Neutron Source (SNS) superconducting linac is identified in computer simulations, and is believed to be one of the mechanisms behind measured beam losses. This weak resonance is induced by the nonlinear dodecapole component of the linac quadrupole magnets. It occurs when the linac focusing lattice has a transverse phase advance close to 60 degrees. By reducing the phase advance to approximately 50 degrees to avoid the resonance, we observe significant reduction in beam loss in the SNS superconducting linac. We present theory and computer simulation results supporting the notion that a suppression of the 60 degrees resonance may contribute to reduction in the beam loss.
C1 [Zhang, Y.] Oak Ridge Natl Lab, SNS, Res Accelerator Div, Oak Ridge, TN 37831 USA.
RP Zhang, Y (reprint author), Oak Ridge Natl Lab, SNS, Res Accelerator Div, POB 2008,MS 6461, Oak Ridge, TN 37831 USA.
FU United States Government, United States Department of Energy
[DE-AC05-00OR22725]
FX The authors would like to thank A. Aleksandrov for many fruitful
discussions. This submission was sponsored by a contractor of the United
States Government under Contract No. DE-AC05-00OR22725 with the United
States Department of Energy.
NR 9
TC 0
Z9 0
U1 0
U2 3
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1098-4402
J9 PHYS REV SPEC TOP-AC
JI Phys. Rev. Spec. Top.-Accel. Beams
PD APR
PY 2010
VL 13
IS 4
AR 044401
DI 10.1103/PhysRevSTAB.13.044401
PG 6
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 602PG
UT WOS:000278150700012
ER
PT J
AU Chanowitz, MS
AF Chanowitz, M. S.
TI Z' bosons, the NuTeV anomaly, and the Higgs boson mass
SO PHYSICS OF ATOMIC NUCLEI
LA English
DT Article
ID STANDARD MODEL; ELECTROWEAK; PARAMETERS; SCATTERING
AB Fits to the precision electroweak data that include the NuTeV measurement are considered in family universal, anomaly free U(1) extensions of the Standard Model. In data sets from which the hadronic asymmetries are excluded, some of the Z' models can double the predicted value of the Higgs boson mass, from similar to 60 to similar to 120 GeV, removing the tension with the LEP II lower bound, while also modestly improving the chi (2) confidence level. The effect of the Z' models on both m (H) and the chi (2) confidence level is increased when the NuTeV measurement is included in the fit. Both the original NuTeV data and a revised estimate by the PDG are considered.
C1 Univ Calif Berkeley, Theoret Phys Grp, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
RP Chanowitz, MS (reprint author), Univ Calif Berkeley, Theoret Phys Grp, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
EM mschanowitz@lbl.gov
FU U.S. Department of Energy [DE-AC03-76SF00098]
FX This work was supported in part by the Director, Office of Science,
Office of High Energy and Nuclear Physics, Division of High Energy
Physics, of the U.S. Department of Energy under contract
DE-AC03-76SF00098.
NR 31
TC 0
Z9 0
U1 0
U2 1
PU MAIK NAUKA/INTERPERIODICA/SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013-1578 USA
SN 1063-7788
J9 PHYS ATOM NUCL+
JI Phys. Atom. Nuclei
PD APR
PY 2010
VL 73
IS 4
BP 680
EP 688
DI 10.1134/S1063778810040149
PG 9
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 586LU
UT WOS:000276911600014
ER
PT J
AU Vasudeo, N
Echekki, T
Day, MS
Bell, JB
AF Vasudeo, Nikhil
Echekki, Tarek
Day, Marcus S.
Bell, John B.
TI The regime diagram for premixed flame kernel-vortex
interactions-Revisited
SO PHYSICS OF FLUIDS
LA English
DT Article
DE chemically reactive flow; combustion; flames; flow simulation;
turbulence; vortices
ID HYDROGEN-AIR FLAMES; TURBULENT COMBUSTION; NUMERICAL-SIMULATION; FLOWS
AB Regimes of flame kernel-vortex (KV) interactions are investigated numerically using a detailed mechanism for hydrogen chemistry. The parametric simulations explore a wide range of conditions that are representative of conditions encountered at various degrees of turbulence intensity. The results show that KV interactions can be classified into five different regimes, which include (1) the laminar kernel regime, (2) the wrinkled kernel regime, (3) the breakthrough regime, (4) the global extinction regime, and (5) the regeneration after global extinction (RGE) regime. With the exception of the last regime, the transition from one regime to another in the order listed corresponds to increasing the vortex size and strength. Operation at the RGE regime reveals interesting dynamics of the flame front that results in reignition or mending of combustion regimes after most of the original kernel has extinguished due to intense straining. Two different types of combustion zones are observed, which correspond to a flamelet structure as well as to more diffuse structures of merged flame segments. A revised regime diagram of the KV interactions is proposed that includes the broader range of KV interactions and incorporates the new RGE regime.
C1 [Vasudeo, Nikhil; Echekki, Tarek] N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA.
[Day, Marcus S.; Bell, John B.] Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Computat Sci & Engn, Berkeley, CA 94720 USA.
RP Vasudeo, N (reprint author), N Carolina State Univ, Dept Mech & Aerosp Engn, Campus Box 7910, Raleigh, NC 27695 USA.
OI Echekki, Tarek/0000-0002-0146-7994
FU National Science Foundation [CBET-0810537]; Applied Mathematics Research
Program of the U.S. Department of Energy [DE-AC02-05CH11231]
FX The work of N.V. and T.E. was supported by the National Science
Foundation under Grant No. CBET-0810537. The work of M.S.D. and J.B.B.
was supported by the Applied Mathematics Research Program of the U.S.
Department of Energy under Contract No. DE-AC02-05CH11231. Computations
were carried out at the NC State High-Performance Computing facility.
NR 17
TC 5
Z9 5
U1 0
U2 18
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 1070-6631
J9 PHYS FLUIDS
JI Phys. Fluids
PD APR
PY 2010
VL 22
IS 4
AR 043602
DI 10.1063/1.3372167
PG 10
WC Mechanics; Physics, Fluids & Plasmas
SC Mechanics; Physics
GA 590QO
UT WOS:000277242300025
ER
PT J
AU Budny, RV
AF Budny, R. V.
TI Current control in ITER steady state plasmas with neutral beam steering
SO PHYSICS OF PLASMAS
LA English
DT Article
DE electric current control; plasma beam injection heating; plasma boundary
layers; plasma density; plasma hybrid waves; plasma
magnetohydrodynamics; plasma radiofrequency heating; plasma temperature;
plasma toroidal confinement; Tokamak devices
ID TOKAMAKS; REACTOR; HYBRID; TRANSPORT; SCENARIOS; PARTICLE; HEAT
AB Predictions of quasisteady state DT plasmas in ITER [R. Aymar , Nucl. Fusion 41, 1301 (2001)] are generated using the PTRANSP code [R. V. Budny, Nucl. Fusion 49, 085008 (2009)]. The plasma temperatures, densities, boundary shape, and total current (9-10 MA) anticipated for ITER steady state plasmas are specified. Current drive by negative ion neutral beam injection, lower-hybrid, and electron cyclotron resonance are calculated. Four modes of operation with different combinations of current drive are studied. For each mode, scans with the negative ion neutral beam injection aimed at differing heights in the plasma are performed to study their effects on current control on the q profile. The time-evolution of the currents and q are calculated, and long-duration transients (up to similar or equal to 1500 s) are predicted. Effects of the beam and alpha ion pressures on the magnetohydrodynamic equilibrium are predicted to significantly alter the bootstrap current. The TEQ equilibrium solver [L. Degtyarev and V. Drozdov, Comput. Phys. Rep. 46, 481 (1985)] in PTRANSP is found to be much more accurate than the VMEC solver [S. P. Hirshman , J. Comput. Phys. 87, 396 (1990)]. Quasisteady state, strongly reversed q profiles are predicted for some beam injection angles when the current drive and bootstrap currents are sufficiently large.
C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
RP Budny, RV (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA.
EM budny@princeton.edu
FU U.S. Department of Energy [DE-AC02-09CH11466]
FX The author wishes to thank R. Andre, R. Goldston, C. Kessel, D. McCune,
and S. Zweben for helpful suggestions. The contributions of the PTRANSP
development teams at PPPL, Lehigh, GA, and LNL are greatly appreciated.
This research is supported by the U.S. Department of Energy under
Contract No. DE-AC02-09CH11466.
NR 43
TC 3
Z9 3
U1 0
U2 2
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 1070-664X
J9 PHYS PLASMAS
JI Phys. Plasmas
PD APR
PY 2010
VL 17
IS 4
AR 042506
DI 10.1063/1.3357353
PG 15
WC Physics, Fluids & Plasmas
SC Physics
GA 590QV
UT WOS:000277243000035
ER
PT J
AU Lang, JY
Fu, GY
Chen, Y
AF Lang, Jianying
Fu, Guo-Yong
Chen, Yang
TI Nonlinear simulation of toroidal Alfveacuten eigenmode with source and
sink
SO PHYSICS OF PLASMAS
LA English
DT Article
DE eigenvalues and eigenfunctions; plasma Alfven waves; plasma collision
processes; plasma instability; plasma kinetic theory; plasma
magnetohydrodynamics; plasma nonlinear waves; plasma simulation; plasma
toroidal confinement; Tokamak devices
ID ENERGETIC INJECTED BEAM; SINGLE-MODE DRIVEN; ALFVEN EIGENMODE; WAVE
PROBLEM; SATURATION; TOKAMAK; INSTABILITIES; STELLARATORS; EVOLUTION
AB Kinetic/magnetohydrodynamic hybrid simulations are carried out to investigate the nonlinear dynamics of energetic particle-driven toroidal Alfveacuten eigenmode with collision and source/sink. For cases well above marginal stability, the mode saturation is approximately steady state with finite collision frequency. The calculated scaling of saturation level with collision frequency agrees well with analytic theory. For cases near-marginal stability at low collision rates, the mode saturation exhibits pulsation behavior with frequency chirps up and down.
C1 [Lang, Jianying; Fu, Guo-Yong] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
[Chen, Yang] Univ Colorado, Boulder, CO 80309 USA.
RP Lang, JY (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA.
FU Department of Energy Scientific Discovery through the U. S. Department
of Energy [DE-AC02-09-CH11466]
FX We gratefully thank H. L. Berk, B. N. Breizman, S. E. Parker, and N. N.
Gorelenkov for stimulating discussions.; We also thank H. L. Berk and B.
N. Breizman for carefully reading the manuscript and for many helpful
comments. One of the authors (J.L.) sincerely thanks J. A. Breslau for
help in the M3D code diagnostics. This work was supported by the
Department of Energy Scientific Discovery through the U. S. Department
of Energy under Grant No. DE-AC02-09-CH11466. All simulations are
performed on Franklin at the National Energy Research Scientific
Computing Center (NERSC).
NR 35
TC 20
Z9 20
U1 2
U2 5
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 1070-664X
J9 PHYS PLASMAS
JI Phys. Plasmas
PD APR
PY 2010
VL 17
IS 4
AR 042309
DI 10.1063/1.3394702
PG 9
WC Physics, Fluids & Plasmas
SC Physics
GA 590QV
UT WOS:000277243000029
ER
PT J
AU Moodera, JS
Miao, GX
Santos, TS
AF Moodera, Jagadeesh S.
Miao, Guo-Xing
Santos, Tiffany S.
TI Frontiers in spin-polarized tunneling
SO PHYSICS TODAY
LA English
DT Article
ID ROOM-TEMPERATURE; LARGE MAGNETORESISTANCE; JUNCTIONS; BARRIERS; FIELD
C1 [Moodera, Jagadeesh S.; Miao, Guo-Xing] MIT, Francis Bitter Magnet Lab, Cambridge, MA 02139 USA.
[Santos, Tiffany S.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
RP Moodera, JS (reprint author), MIT, Francis Bitter Magnet Lab, Cambridge, MA 02139 USA.
RI Miao, Guo-Xing/A-2411-2008
OI Miao, Guo-Xing/0000-0002-8735-8077
FU NSF; Office of Naval Research; Defense Advanced Research Projects
Agency; Korea Institute of Science and Technology
FX The authors are grateful to Robert Meservey and Paul Tedrow for
extensive discussions and to our research funding agencies-NSF, Office
of Naval Research, the Defense Advanced Research Projects Agency, and
the Korea Institute of Science and Technology-MIT joint program-for
sustained support.
NR 23
TC 30
Z9 30
U1 0
U2 16
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0031-9228
EI 1945-0699
J9 PHYS TODAY
JI Phys. Today
PD APR
PY 2010
VL 63
IS 4
BP 46
EP 51
PG 6
WC Physics, Multidisciplinary
SC Physics
GA 581TS
UT WOS:000276548200023
ER
PT J
AU Crease, RP
AF Crease, Robert P.
TI Dealing with doomsday
SO PHYSICS WORLD
LA English
DT Article
C1 [Crease, Robert P.] SUNY Stony Brook, Dept Philosophy, Stony Brook, NY 11790 USA.
[Crease, Robert P.] Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Crease, RP (reprint author), SUNY Stony Brook, Dept Philosophy, Stony Brook, NY 11790 USA.
EM rcrease@notes.cc.sunysb.edu
NR 0
TC 0
Z9 0
U1 2
U2 2
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0953-8585
J9 PHYS WORLD
JI Phys. World
PD APR
PY 2010
VL 23
IS 4
BP 32
EP 36
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 587XL
UT WOS:000277029600030
ER
PT J
AU Harholt, J
Bach, IC
Lind-Bouquin, S
Nunan, KJ
Madrid, SM
Brinch-Pedersen, H
Holm, PB
Scheller, HV
AF Harholt, Jesper
Bach, Inga C.
Lind-Bouquin, Solveig
Nunan, Kylie J.
Madrid, Susan M.
Brinch-Pedersen, Henrik
Holm, Preben B.
Scheller, Henrik V.
TI Generation of transgenic wheat (Triticum aestivum L.) accumulating
heterologous endo-xylanase or ferulic acid esterase in the endosperm
SO PLANT BIOTECHNOLOGY JOURNAL
LA English
DT Article
DE cell walls; endo-xylanase; ferulic acid esterase; Triticum aestivum L
ID CELL-WALL POLYSACCHARIDES; ENDOXYLANASE INHIBITORS;
RHAMNOGALACTURONAN-I; DIETARY FIBER; ARABINOXYLANS; DIGESTIBILITY;
EXPRESSION; PROTEINS; BARLEY; GENES
AB P>Endo-xylanase (from Bacillus subtilis) or ferulic acid esterase (from Aspergillus niger) were expressed in wheat under the control of the endosperm-specific 1DX5 glutenin promoter. Constructs both with and without the endoplasmic reticulum retention signal (Lys-Asp-Glu-Leu) KDEL were used. Transgenic plants were recovered in all four cases but no qualitative differences could be observed whether KDEL was added or not. Endo-xylanase activity in transgenic grains was increased between two and threefold relative to wild type. The grains were shrivelled and had a 25%-33% decrease in mass. Extensive analysis of the cell walls showed a 10%-15% increase in arabinose to xylose ratio, a 50% increase in the proportion of water-extractable arabinoxylan, and a shift in the MW of the water-extractable arabinoxylan from being mainly larger than 85 kD to being between 2 and 85 kD. Ferulic acid esterase-expressing grains were also shrivelled, and the seed weight was decreased by 20%-50%. No ferulic acid esterase activity could be detected in wild-type grains whereas ferulic acid esterase activity was detected in transgenic lines. The grain cell walls had 15%-40% increase in water-unextractable arabinoxylan and a decrease in monomeric ferulic acid between 13% and 34%. In all the plants, the observed changes are consistent with a plant response that serves to minimize the effect of the heterologously expressed enzymes by increasing arabinoxylan biosynthesis and cross-linking.
C1 [Harholt, Jesper; Nunan, Kylie J.; Scheller, Henrik V.] Univ Copenhagen, Fac Life Sci, VKR Res Ctr Proact Plants, Plant Mol Biol Lab,Dept Plant Biol & Biotechnol, Frederiksberg C, Denmark.
[Bach, Inga C.; Lind-Bouquin, Solveig; Brinch-Pedersen, Henrik; Holm, Preben B.] Aarhus Univ, Res Ctr Flakkebjerg, Fac Agr Sci, Dept Genet & Biotechnol, Slagelse, Denmark.
[Madrid, Susan M.] Genencor Inc, Palo Alto, CA USA.
[Scheller, Henrik V.] Joint BioEnergy Inst, Emeryville, CA USA.
RP Scheller, HV (reprint author), Univ Copenhagen, Fac Life Sci, VKR Res Ctr Proact Plants, Plant Mol Biol Lab,Dept Plant Biol & Biotechnol, Frederiksberg C, Denmark.
EM hscheller@lbl.gov
RI Scheller, Henrik/A-8106-2008; Harholt, Jesper/F-3760-2011; Harholt,
Jesper/F-6865-2014
OI Scheller, Henrik/0000-0002-6702-3560; Harholt,
Jesper/0000-0002-7984-0066
FU US. Department of Energy, Office of Science, Office of Biological and
Environmental Research [DE-AC02-05CH11231]; Lawrence Berkeley National
Laboratory [DE-AC02-05CH11231]; US. Department of Energy
[DE-AC02-05CH11231]; Danish Natural Science Research Council; Danish
Food Industry Agency
FX Lis Bagnkop Holte is thanked for technical assistance and Ole Brad
Hansen for taking care of the plants. This work was supported by the US.
Department of Energy, Office of Science, Office of Biological and
Environmental Research, through contract DE-AC02-05CH11231 between
Lawrence Berkeley National Laboratory and the US. Department of Energy;
the Danish Natural Science Research Council, and the Danish Food
Industry Agency.
NR 45
TC 25
Z9 27
U1 1
U2 11
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 1467-7644
EI 1467-7652
J9 PLANT BIOTECHNOL J
JI Plant Biotechnol. J.
PD APR
PY 2010
VL 8
IS 3
BP 351
EP 362
DI 10.1111/j.1467-7652.2009.00490.x
PG 12
WC Biotechnology & Applied Microbiology; Plant Sciences
SC Biotechnology & Applied Microbiology; Plant Sciences
GA 563PS
UT WOS:000275145800010
PM 20102532
ER
PT J
AU Weng, JK
Akiyama, T
Bonawitz, ND
Li, X
Ralph, J
Chapple, C
AF Weng, Jing-Ke
Akiyama, Takuya
Bonawitz, Nicholas D.
Li, Xu
Ralph, John
Chapple, Clint
TI Convergent Evolution of Syringyl Lignin Biosynthesis via Distinct
Pathways in the Lycophyte Selaginella and Flowering Plants
SO PLANT CELL
LA English
DT Article
ID CYTOCHROME P450-DEPENDENT MONOOXYGENASE; GENERAL PHENYLPROPANOID
PATHWAY; ARABIDOPSIS-THALIANA; CINNAMOYL-COA; FERULATE 5-HYDROXYLASE;
ALCOHOL-DEHYDROGENASE; MUTANT; HYDROXYCINNAMOYLTRANSFERASE;
3-HYDROXYLASE; PURIFICATION
AB Phenotypic convergence in unrelated lineages arises when different organisms adapt similarly under comparable selective pressures. In an apparent example of this process, syringyl lignin, a fundamental building block of plant cell walls, occurs in two major plant lineages, lycophytes and angiosperms, which diverged from one another more than 400 million years ago. Here, we show that this convergence resulted from independent recruitment of lignin biosynthetic cytochrome P450-dependent monooxygenases that route cell wall monomers through related but distinct pathways in the two lineages. In contrast with angiosperms, in which syringyl lignin biosynthesis requires two phenylpropanoid meta-hydroxylases C3'H and F5H, the lycophyte Selaginella employs one phenylpropanoid dual meta-hydroxylase to bypass several steps of the canonical lignin biosynthetic pathway. Transgenic expression of the Selaginella hydroxylase in Arabidopsis thaliana dramatically reroutes its endogenous lignin biosynthetic pathway, yielding a novel lignin composition not previously identified in nature. Our findings demonstrate a unique case of convergent evolution via distinct biochemical strategies and suggest a new way to genetically reconstruct lignin biosynthesis in higher plants.
C1 [Weng, Jing-Ke; Bonawitz, Nicholas D.; Li, Xu; Chapple, Clint] Purdue Univ, Dept Biochem, W Lafayette, IN 47907 USA.
[Akiyama, Takuya; Ralph, John] ARS, US Dairy Forage Res Ctr, USDA, Madison, WI 53706 USA.
[Ralph, John] Univ Wisconsin, Enzyme Inst, Dept Biochem, Madison, WI 53726 USA.
[Ralph, John] Univ Wisconsin, Dept Energy, Great Lakes Bioenergy Res Ctr, Madison, WI 53726 USA.
RP Chapple, C (reprint author), Purdue Univ, Dept Biochem, W Lafayette, IN 47907 USA.
EM chapple@purdue.edu
RI Ye, Mingli/G-4909-2012; Weng, Jing-Ke/E-7343-2013; Weng,
Jing-Ke/A-6900-2015
OI Weng, Jing-Ke/0000-0003-1079-3668; Weng, Jing-Ke/0000-0003-3059-0075
FU National Science Foundation [IOB-0450289]; Department of Energy (DOE)
Office of Science [DE-AI02-06ER64299]; DOE Great Lakes Bioenergy
Research Center (DOE Office of Science) [BER DE-FC02-07ER64494]; Life
Sciences Research Foundation
FX This work is funded by the National Science Foundation (Grant
IOB-0450289). Partial funding to J.R. was via the Department of Energy
(DOE) Office of Science (Grant DE-AI02-06ER64299) and the DOE Great
Lakes Bioenergy Research Center (DOE Office of Science BER
DE-FC02-07ER64494). N.D.B. is supported by a fellowship from the Life
Sciences Research Foundation. We thank J.A. Banks for providing
Selaginella moellendorffii plant materials.
NR 42
TC 58
Z9 59
U1 6
U2 30
PU AMER SOC PLANT BIOLOGISTS
PI ROCKVILLE
PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 USA
SN 1040-4651
J9 PLANT CELL
JI Plant Cell
PD APR
PY 2010
VL 22
IS 4
BP 1033
EP 1045
DI 10.1105/tpc.109.073528
PG 13
WC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology
SC Biochemistry & Molecular Biology; Plant Sciences; Cell Biology
GA 606HZ
UT WOS:000278414900008
PM 20371642
ER
PT J
AU Zhao, N
Guan, J
Ferrer, JL
Engle, N
Chern, M
Ronald, P
Tschaplinski, TJ
Chen, F
AF Zhao, Nan
Guan, Ju
Ferrer, Jean-Luc
Engle, Nancy
Chern, Mawsheng
Ronald, Pamela
Tschaplinski, Timothy J.
Chen, Feng
TI Biosynthesis and emission of insect-induced methyl salicylate and methyl
benzoate from rice
SO PLANT PHYSIOLOGY AND BIOCHEMISTRY
LA English
DT Article
DE Methyl salicylate; Methyl benzoate; Insect herbivory; Rice;
Methyltransferase; OsBSMT1; SABATH family
ID ACID CARBOXYL METHYLTRANSFERASE; SYSTEMIC ACQUIRED-RESISTANCE; FLORAL
SCENT PRODUCTION; ADENOSYL-L-METHIONINE; ARABIDOPSIS-THALIANA; JASMONIC
ACID; INDOLE-3-ACETIC-ACID METHYLTRANSFERASE; STEPHANOTIS-FLORIBUNDA;
PATHOGEN RESISTANCE; SNAPDRAGON FLOWERS
AB Two benzenoid esters, methyl salicylate (MeSA) and methyl benzoate (MeBA), were detected from insect-damaged rice plants. By correlating metabolite production with gene expression analysis, five candidate genes encoding putative carboxyl methyltransferases were identified. Enzymatic assays with Escherichia coli-expressed recombinant proteins demonstrated that only one of the five candidates, OsBSMT1, has salicylic acid (SA) methyltransferase (SAMT) and benzoic acid (BA) methyltransferase (BAMT) activities for producing MeSA and MeBA, respectively. Whereas OsBSMT1 is phylogenetically relatively distant from dicot SAMTs, the three-dimensional structure of OsBSMT1, which was determined using homology-based structural modeling, is highly similar to those of characterized SAMTs. Analyses of OsBSMT1 expression in wild-type rice plants under various stress conditions indicate that the jasmonic acid (JA) signaling pathway plays a critical role in regulating the production and emission of MeSA in rice. Further analysis using transgenic rice plants overexpressing NH1, a key component of the SA signaling pathway in rice, suggests that the SA signaling pathway also plays an important role in governing OsBSMT1 expression and emission of its products, probably through a crosstalk with the JA signaling pathway. The role of the volatile products of OsBSMT1, MeSA and MeBA, in rice defense against insect herbivory is discussed. (c) 2010 Elsevier Masson SAS. All rights reserved.
C1 [Zhao, Nan; Guan, Ju; Chen, Feng] Univ Tennessee, Dept Plant Sci, Knoxville, TN 37996 USA.
[Ferrer, Jean-Luc] Univ Grenoble 1, CNRS, Commissariat Energie Atom, Inst Biol Struct, F-38027 Grenoble 1, France.
[Engle, Nancy; Tschaplinski, Timothy J.] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA.
[Chern, Mawsheng; Ronald, Pamela] Univ Calif Davis, Dept Plant Pathol, Davis, CA 95616 USA.
RP Chen, F (reprint author), Univ Tennessee, Dept Plant Sci, 252 Ellington Plant Sci Bldg,2431 Joe Johnson Dr, Knoxville, TN 37996 USA.
EM fengc@utk.edu
OI Tschaplinski, Timothy/0000-0002-9540-6622; Engle,
Nancy/0000-0003-0290-7987
FU University of Tennessee; "Commissariat a l'Energie Atomique"; "Centre
National de la Recherche Scientifique"; Joseph Fourier University; U.S.
Department of Energy, Office of Science, Biological and Environmental
Research; Oak Ridge National Laboratory is managed by UT-Battelle, LLC
[DE-AC05-000R22725]
FX This work was supported in part by a research start-up fund from the
University of Tennessee (to F.C.), by the "Commissariat a l'Energie
Atomique", the "Centre National de la Recherche Scientifique" and the
Joseph Fourier University (to J.-L.F.). N.E. and T.J.T. were supported
by the U.S. Department of Energy, Office of Science, Biological and
Environmental Research. Oak Ridge National Laboratory is managed by
UT-Battelle, LLC, for the U.S. Department of Energy under contract
DE-AC05-000R22725.
NR 48
TC 28
Z9 35
U1 8
U2 47
PU ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
PI PARIS
PA 23 RUE LINOIS, 75724 PARIS, FRANCE
SN 0981-9428
J9 PLANT PHYSIOL BIOCH
JI Plant Physiol. Biochem.
PD APR
PY 2010
VL 48
IS 4
BP 279
EP 287
DI 10.1016/j.plaphy.2010.01.023
PG 9
WC Plant Sciences
SC Plant Sciences
GA 585CZ
UT WOS:000276803200010
PM 20199866
ER
PT J
AU Kolesnikov, RA
Wang, WX
Hinton, FL
Rewoldt, G
Tang, WM
AF Kolesnikov, R. A.
Wang, W. X.
Hinton, F. L.
Rewoldt, G.
Tang, W. M.
TI Drift-kinetic studies of neoclassical poloidal rotation with finite
orbits
SO PLASMA PHYSICS AND CONTROLLED FUSION
LA English
DT Article
ID BOOTSTRAP CURRENT; TRANSPORT
AB A significant discrepancy of poloidal velocity from conventional theoretical predictions is found in global neoclassical drift-kinetic simulations of magnetic confinement fusion devices. The difference is identified as being due to the presence of large ion orbits. In the case of a large aspect ratio tokamak configuration with steep toroidal flow profiles, a novel heuristic model which estimates this nonlocal effect is presented and shown to be in good agreement with simulation results. The dominant nonlocal mechanisms captured by the model are associated with ion parallel flow modification due to the steep toroidal flow and radial electric field profiles. We compare simulation results with theoretical estimates based on the new model using profiles relevant for the National Spherical Torus Experiment. The carbon poloidal velocity observed in the simulation is in good agreement with the neoclassical theory modified by the newly identified nonlocal effects.
C1 [Kolesnikov, R. A.; Wang, W. X.; Rewoldt, G.; Tang, W. M.] Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
[Hinton, F. L.] Univ Calif San Diego, La Jolla, CA 92093 USA.
RP Kolesnikov, RA (reprint author), Princeton Univ, Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA.
FU US DOE [DE-AC02-09CH11466]
FX This work was supported by US DOE contract No. DE-AC02-09CH11466. The
authors would like to thank R E Bell and S M Kaye for useful
discussions.
NR 12
TC 4
Z9 4
U1 0
U2 5
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0741-3335
J9 PLASMA PHYS CONTR F
JI Plasma Phys. Control. Fusion
PD APR
PY 2010
VL 52
IS 4
AR 042002
DI 10.1088/0741-3335/52/4/042002
PG 9
WC Physics, Fluids & Plasmas
SC Physics
GA 571JP
UT WOS:000275748400002
ER
PT J
AU Logan, NC
Strait, EJ
Reimerdes, H
AF Logan, N. C.
Strait, E. J.
Reimerdes, H.
TI Measurement of the electromagnetic torque in rotating DIII-D plasmas
SO PLASMA PHYSICS AND CONTROLLED FUSION
LA English
DT Article
ID TRANSPORT; TOKAMAKS; LOCKING
AB The electromagnetic torque due to either static or rotating magnetic perturbations, or both, on a rotating DIII-D plasma is studied by deriving an estimate of the torque from measurements of various components of the magnetic perturbation at the wall. This approach is based on the Maxwell stress tensor formalism (Hutchinson 2001 Plasma Phys. Control. Fusion 43 145). For the locking of large tearing modes, this measurement of the electromagnetic torque at the time of the locking is consistent with the equation of motion. Measurements and modeling show that for mode rotation frequencies above a few hundred hertz the momentum transfer between magnetic perturbations and the graphite tiles is no longer negligible, revealing the necessity for a new two-wall model of the tokamak. The shielding effect of the tiles on magnetic field measurements is calculated, and shown to be consistent with unrealistically small torques measured during high frequency modes. The electromagnetic torque proves to be an important factor in determining plasma rotation at a wide range of mode frequencies from zero to the kilohertz range. It can be comparable to other sources of torque, such as tangential neutral beam injection for heating.
C1 [Logan, N. C.] Brown Univ, Dept Phys, Providence, RI 02912 USA.
[Strait, E. J.] Gen Atom Co, San Diego, CA 92186 USA.
[Reimerdes, H.] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
RP Logan, NC (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA.
EM strait@fusion.gat.com
FU US Department of Energy [DE-FC02-04ER54698, DE-FG02-8953297]
FX This work was supported in part by the US Department of Energy under a
National Undergraduate Fusion Fellowship and under DE-FC02-04ER54698 and
DE-FG02-8953297. The authors are grateful to R J La Haye for the helpful
discussions. NCL wishes to thank Ian Dell'Antonio (Brown University) for
his guidance and advice throughout this period of research.
NR 16
TC 9
Z9 9
U1 0
U2 3
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0741-3335
J9 PLASMA PHYS CONTR F
JI Plasma Phys. Control. Fusion
PD APR
PY 2010
VL 52
IS 4
AR 045013
DI 10.1088/0741-3335/52/4/045013
PG 15
WC Physics, Fluids & Plasmas
SC Physics
GA 571JP
UT WOS:000275748400015
ER
PT J
AU Van Zeeland, MA
Yu, JH
Brooks, NH
Heidbrink, WW
Burrell, KH
Groebner, RJ
Hyatt, AW
Luce, TC
Pablant, N
Solomon, WM
Wade, MR
AF Van Zeeland, M. A.
Yu, J. H.
Brooks, N. H.
Heidbrink, W. W.
Burrell, K. H.
Groebner, R. J.
Hyatt, A. W.
Luce, T. C.
Pablant, N.
Solomon, W. M.
Wade, M. R.
TI Active and passive spectroscopic imaging in the DIII-D tokamak
SO PLASMA PHYSICS AND CONTROLLED FUSION
LA English
DT Article
ID EXCHANGE RECOMBINATION SPECTROSCOPY; BEAM EMISSION-SPECTROSCOPY; Z(EFF);
PLASMA; PROFILES
AB Wide-angle, 2D imaging of Doppler-shifted, Balmer alpha (D alpha) emission from high energy injected neutrals, charge exchange recombination (CER) emission from neutral beam interaction with thermal ions and fully stripped impurity ions and visible bremsstrahlung (VB) from the core of DIII-D plasmas has been carried out. Narrowband interference filters were used to isolate the specific wavelength ranges of visible radiation for detection by a tangentially viewing, fast-framing camera. Measurements of the Da emission from fast neutrals injected into the plasma from the low field side reveal the vertical distribution of the beam, its divergence and the variation in its radial penetration with density. Modeling of this emission using both a full Monte Carlo collisional radiative code as well as a simple beam attenuation code coupled to Atomic Data and Analysis Structure emissivity lookup tables yields qualitative agreement, however the absolute magnitudes of the emissivities in the predicted distribution are larger than those measured. Active measurements of carbon CER brightness are in agreement with those made independently along the beam midplane using DIII-D's multichordal, CER spectrometer system, confirming the potential of this technique for obtaining 2D profiles of impurity density. Passive imaging of VB, which can be inverted to obtain local emissivity profiles, is compared with measurements from both a calibrated filter/photomultiplier array and the standard multichordal CER spectrometer system.
C1 [Van Zeeland, M. A.; Brooks, N. H.; Burrell, K. H.; Groebner, R. J.; Hyatt, A. W.; Luce, T. C.; Wade, M. R.] Gen Atom Co, San Diego, CA 92186 USA.
[Yu, J. H.; Pablant, N.] Univ Calif San Diego, La Jolla, CA 92093 USA.
[Heidbrink, W. W.] Univ Calif Irvine, Irvine, CA 92697 USA.
[Solomon, W. M.] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
RP Van Zeeland, MA (reprint author), Gen Atom Co, POB 85608, San Diego, CA 92186 USA.
EM vanzeeland@fusion.gat.com
OI Solomon, Wayne/0000-0002-0902-9876
FU US Department of Energy [DE-FC02-04ER54698, DE-FG02-07ER54917,
SC-G903402, DE-AC02-09CH11466]
FX This work was supported by the US Department of Energy under
DE-FC02-04ER54698, DE-FG02-07ER54917, SC-G903402 and DE-AC02-09CH11466.
The authors would like to thank the DIII-D team for providing the
plasmas and specially acknowledge Dr Martin O'Mullane's help with the
ADAS database analysis and Dr Brian Grierson's careful analysis of the
FIDA simulation code. Effective beam emissivities, stopping cross
sections and charge exchange cross sections in the FIDA simulation code
were obtained from the Atomic Data and Analysis Structure (ADAS)
compilation. The originating developer of ADAS is the JET Joint
Undertaking.
NR 38
TC 16
Z9 16
U1 2
U2 10
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0741-3335
J9 PLASMA PHYS CONTR F
JI Plasma Phys. Control. Fusion
PD APR
PY 2010
VL 52
IS 4
AR 045006
DI 10.1088/0741-3335/52/4/045006
PG 22
WC Physics, Fluids & Plasmas
SC Physics
GA 571JP
UT WOS:000275748400008
ER
PT J
AU White, RB
Gorelenkov, N
Heidbrink, WW
Van Zeeland, MA
AF White, R. B.
Gorelenkov, N.
Heidbrink, W. W.
Van Zeeland, M. A.
TI Particle distribution modification by low amplitude modes
SO PLASMA PHYSICS AND CONTROLLED FUSION
LA English
DT Article
ID BEAM-ION LOSS; ALFVEN EIGENMODE; ASDEX UPGRADE; TRANSPORT; SIMULATIONS;
TOKAMAKS; LOSSES; JET
AB Modification of a high energy particle distribution by a spectrum of low amplitude modes is investigated using a guiding center code. Only through resonance are modes effective in modifying the distribution. Diagnostics are used to illustrate the mode-particle interaction and to find which effects are relevant in producing significant resonance, including kinetic Poincare plots and plots showing those orbits with time averaged mode-particle energy transfer. Effects of pitch angle scattering and drag are studied, as well as plasma rotation and time dependence of the equilibrium and mode frequencies. A specific example of changes observed in a DIII-D deuterium beam distribution in the presence of low amplitude experimentally validated Toroidal Alfven eigenmodes and reversed shear Alfven eigenmodes is examined in detail. Comparison with experimental data shows that multiple low amplitude modes can account for significant modification of high energy beam particle distributions. It is found that there is a stochastic threshold for beam profile modification, and that the experimental amplitudes are only slightly above this threshold.
C1 [White, R. B.; Gorelenkov, N.] Princeton Univ, Plasma Phys Lab, Princeton, NJ 08543 USA.
[Heidbrink, W. W.] Univ Calif Irvine, Irvine, CA 92697 USA.
[Van Zeeland, M. A.] Gen Atom Co, San Diego, CA 92186 USA.
RP White, RB (reprint author), Princeton Univ, Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA.
RI White, Roscoe/D-1773-2013
OI White, Roscoe/0000-0002-4239-2685
FU US Department of Energy [DE-AC02-09CH11466, SC-6903402,
DE-FC02-04ER54698]
FX This work was partially supported by the US Department of Energy Grants
DE-AC02-09CH11466, SC-6903402 and DE-FC02-04ER54698. The authors
acknowledge useful discussions with Y Kolesnichenko, Y Yakovenko and R E
Waltz.
NR 38
TC 38
Z9 38
U1 0
U2 3
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0741-3335
J9 PLASMA PHYS CONTR F
JI Plasma Phys. Control. Fusion
PD APR
PY 2010
VL 52
IS 4
AR 045012
DI 10.1088/0741-3335/52/4/045012
PG 23
WC Physics, Fluids & Plasmas
SC Physics
GA 571JP
UT WOS:000275748400014
ER
PT J
AU Arnoult, N
Schluth-Bolard, C
Letessier, A
Drascovic, I
Bouarich-Bourimi, R
Campisi, J
Kim, SH
Boussouar, A
Ottaviani, A
Magdinier, F
Gilson, E
Londono-Vallejo, A
AF Arnoult, Nausica
Schluth-Bolard, Caroline
Letessier, Anne
Drascovic, Irena
Bouarich-Bourimi, Rachida
Campisi, Judith
Kim, Sahn-ho
Boussouar, Amina
Ottaviani, Alexandre
Magdinier, Frederique
Gilson, Eric
Londono-Vallejo, Arturo
TI Replication Timing of Human Telomeres Is Chromosome Arm-Specific,
Influenced by Subtelomeric Structures and Connected to Nuclear
Localization
SO PLOS GENETICS
LA English
DT Article
ID HEMATOPOIETIC STEM-CELLS; DYSKERATOSIS-CONGENITA; DNA-REPLICATION; HUMAN
FIBROBLASTS; HUMAN GENOME; S-PHASE; YEAST; LENGTH; DISEASE; COMPONENT
AB The mechanisms governing telomere replication in humans are still poorly understood. To fill this gap, we investigated the timing of replication of single telomeres in human cells. Using in situ hybridization techniques, we have found that specific telomeres have preferential time windows for replication during the S-phase and that these intervals do not depend upon telomere length and are largely conserved between homologous chromosomes and between individuals, even in the presence of large subtelomeric segmental polymorphisms. Importantly, we show that one copy of the 3.3 kb macrosatellite repeat D4Z4, present in the subtelomeric region of the late replicating 4q35 telomere, is sufficient to confer both a more peripheral localization and a later-replicating property to a de novo formed telomere. Also, the presence of b-satellite repeats next to a newly created telomere is sufficient to delay its replication timing. Remarkably, several native, non-D4Z4-associated, late-replicating telomeres show a preferential localization toward the nuclear periphery, while several early replicating telomeres are associated with the inner nuclear volume. We propose that, in humans, chromosome arm-specific subtelomeric sequences may influence both the spatial distribution of telomeres in the nucleus and their replication timing.
C1 [Arnoult, Nausica; Drascovic, Irena; Bouarich-Bourimi, Rachida; Londono-Vallejo, Arturo] Univ Paris 06, CNRS, Inst Curie, Telomeres & Canc Lab, Paris, France.
[Schluth-Bolard, Caroline; Boussouar, Amina; Ottaviani, Alexandre; Magdinier, Frederique; Gilson, Eric] Ecole Normale Super Lyon, CNRS ENS UCBL IFR128, F-69364 Lyon, France.
[Letessier, Anne] Univ Paris 06, Inst Curie, Funct Org & Plast Mammalian Genomes, Paris, France.
[Campisi, Judith; Kim, Sahn-ho] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Campisi, Judith] Buck Inst Age Res, Novato, CA USA.
RP Arnoult, N (reprint author), Univ Paris 06, CNRS, Inst Curie, Telomeres & Canc Lab, Paris, France.
EM Arturo.Londono@curie.fr
RI Magdinier, Frederique/I-4735-2016;
OI Magdinier, Frederique/0000-0002-0159-9559; Arnoult,
Nausica/0000-0003-2633-0270
FU ANR [NT05-4_41705]; ARC; Institut Curie; Association Francaise contre
les myopathies; FSHD global association; MENRST; AFM
FX This work was supported by the ANR (grant NT05-4_41705 to AL-V), ARC (to
AL-V and EG), the PIC program (Institut Curie to AL-V), the Association
Francaise contre les myopathies (to FM), and the FSHD global association
(to FM). NA is the recipient of a PhD fellowship from MENRST and ARC. AB
is the recipient of a fellowship from AFM. The funders had no role in
study design, data collection and analysis, decision to publish, or
preparation of the manuscript.
NR 77
TC 32
Z9 33
U1 0
U2 3
PU PUBLIC LIBRARY SCIENCE
PI SAN FRANCISCO
PA 185 BERRY ST, STE 1300, SAN FRANCISCO, CA 94107 USA
SN 1553-7390
J9 PLOS GENET
JI PLoS Genet.
PD APR
PY 2010
VL 6
IS 4
AR e1000920
DI 10.1371/journal.pgen.1000920
PG 15
WC Genetics & Heredity
SC Genetics & Heredity
GA 592CY
UT WOS:000277354200037
PM 20421929
ER
PT J
AU Jespersen, ST
Baudry, F
Wakeman, MD
Michaud, V
Blanchard, P
Norris, R
Manson, JA
AF Jespersen, S. T.
Baudry, F.
Wakeman, M. D.
Michaud, V.
Blanchard, P.
Norris, R.
Manson, J-A. E.
TI Consolidation of Net-shape Random Fiber Thermoplastic Composite Preforms
SO POLYMER COMPOSITES
LA English
DT Article
ID MICROMECHANICAL PROPERTIES; POLYPROPYLENE COMPOSITES; COMMINGLED YARNS;
GLASS
AB A novel thermoplastic composite preforming process has been developed. This thermoplastic programmable powdered preforming process (TP-P4) uses commingled glass and polypropylene yarns, which are chopped to a desired length and deposited onto a vacuum screen. The as-placed fibers are then heat-set for improved handling, before potential preconsolidation, and final conversion with preheating and press forming. This work investigated the effect of using either a double belt lamination preconsolidation stage or using an improved heat-setting stage. Polymer degradation was examined using gel permeation chromatography analysis, and the void content evolution tracked using image analysis techniques from the heat setting stage until the final part. It was shown that without preconsolidation, preforms prepared for a 2 mm thick final pressed part could be compression molded into a substantially void free, non degraded part. By using the lamination route, this limit could be increased to 4 mm, but without allowing local thickness changes in the preform. POLYM. COMPOS., 31:653-665, 2010. (C) 2009 Society of Plastics Engineers
C1 [Jespersen, S. T.; Baudry, F.; Wakeman, M. D.; Michaud, V.; Manson, J-A. E.] Ecole Polytech Fed Lausanne, Lab Technol Composites & Polymeres LTC, CH-1015 Lausanne, Switzerland.
[Blanchard, P.] Ford Motor Co, Ford Res & Innovat Ctr, Dearborn, MI 48124 USA.
[Norris, R.] US DOE, Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Manson, JA (reprint author), Ecole Polytech Fed Lausanne, Lab Technol Composites & Polymeres LTC, CH-1015 Lausanne, Switzerland.
EM jan-anders.manson@epfl.ch
RI Michaud, Veronique/A-6390-2009; Norris, Robert/E-5670-2017;
OI Michaud, Veronique/0000-0001-5699-740X; Wakeman,
Martyn/0000-0003-2590-6143
NR 15
TC 0
Z9 0
U1 1
U2 17
PU JOHN WILEY & SONS INC
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN, NJ 07030 USA
SN 0272-8397
J9 POLYM COMPOSITE
JI Polym. Compos.
PD APR
PY 2010
VL 31
IS 4
BP 653
EP 665
DI 10.1002/pc.20844
PG 13
WC Materials Science, Composites; Polymer Science
SC Materials Science; Polymer Science
GA 571XZ
UT WOS:000275791000013
ER
PT J
AU Billman, L
AF Billman, Lynn
TI Wind Destroyed and Now Powers Greensburg, Kansas
SO POWER
LA English
DT Article
AB Greensburg was destroyed by an EF5 tornado on May 4, 2007. Instead of abandoning the Kansas town, the community quickly embraced the task of rebuilding it from the ground up, maximizing the use of renewable energy sources and energy efficient building techniques. Rebuilding continues, but the future of Greensburg has never been stronger.
C1 Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Billman, L (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA.
EM lynn.billman@nrel.gov
NR 0
TC 0
Z9 0
U1 0
U2 9
PU TRADEFAIR GROUP
PI HOUSTON
PA 11000 RICHMOND, STE 500, HOUSTON, TX 77042 USA
SN 0032-5929
J9 POWER
JI Power
PD APR
PY 2010
VL 154
IS 4
BP 24
EP +
PG 5
WC Energy & Fuels
SC Energy & Fuels
GA 581XS
UT WOS:000276559700010
ER
PT J
AU Bono, MJ
Seugling, RM
Kroll, JJ
Nederbragt, WW
AF Bono, Matthew J.
Seugling, Richard M.
Kroll, Jeremy J.
Nederbragt, Walter W.
TI An uncertainty analysis of tool setting methods for a precision lathe
with a B-axis rotary table
SO PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR
PRECISION ENGINEERING AND NANOTECHNOLOGY
LA English
DT Article
DE Tool setting; Uncertainty; Precision lathe; Rotary table; B-axis;
Diamond turning
ID CUTTING-TOOL
AB This study develops a method for calculating the precision with which a cutting tool can be set along the axis of rotation of a B-axis rotary table on a lathe. The uncertainty with which the tool can be set on the rotary table is calculated from knowledge of the machine tool, the probing system, and the effects of the environment. Three common tool-setting techniques are analyzed as examples. The techniques analyzed are a touch probe tool set station, a technique that machines grooves in the face of a workpiece and then measures the relative depths of the grooves, and an optical tool set station that uses a video camera looking down onto the rake face of the cutting tool. Experiments using these three example techniques reveal the precision with which a tool can be set. For each technique, the predicted tool setting uncertainties agree with the experimentally determined values. Therefore, this method can estimate how well a tool can be set along the axis of rotation of a B-axis rotary table for a particular application, without the need for extensive tool setting experiments. (C) 2009 Elsevier Inc. All rights reserved.
C1 [Bono, Matthew J.; Seugling, Richard M.; Kroll, Jeremy J.; Nederbragt, Walter W.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Bono, MJ (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA.
EM bono1@llnl.gov
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]
FX This work was made possible by the skill and experience of several
diamond turning experts. Background knowledge on tool setting methods
was provided by Don Bennett, Carlos Castro, Jack Reynolds, Jim Hamilton,
and John Taylor. Paul Van Horn helped with many of the experiments. This
work was performed under the auspices of the U.S. Department of Energy
by Lawrence Livermore National Laboratory under Contract
DE-AC52-07NA27344.
NR 11
TC 6
Z9 7
U1 0
U2 2
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0141-6359
J9 PRECIS ENG
JI Precis. Eng.-J. Int. Soc. Precis. Eng. Nanotechnol.
PD APR
PY 2010
VL 34
IS 2
BP 242
EP 252
DI 10.1016/j.precisioneng.2009.06.003
PG 11
WC Engineering, Multidisciplinary; Engineering, Manufacturing; Nanoscience
& Nanotechnology; Instruments & Instrumentation
SC Engineering; Science & Technology - Other Topics; Instruments &
Instrumentation
GA 571TE
UT WOS:000275777900004
ER
PT J
AU Mills, GB
AF Mills, Geoffrey B.
TI Short baseline neutrino physics: MiniBooNE and beyond
SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
LA English
DT Review
ID OSCILLATIONS; SEARCH
AB The MiniBooNE experiment, a short baseline neutrino oscillation experiment currently running at Fermi lab, has observed an unexplained excess of nu(e)-like events at energies between 200 MeV and 475 MeV. Those results and the results of the LSND excess events in (nu) over bar (e) are compared to a non-standard oscillation pattern that involves three active and two sterile neutrinos. Some future possibilities for short future baseline programs are also discussed. Published by Elsevier B.V.
C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Mills, GB (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
EM mills@lanl.gov
NR 17
TC 0
Z9 0
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0146-6410
EI 1873-2224
J9 PROG PART NUCL PHYS
JI Prog. Part. Nucl. Phys.
PD APR
PY 2010
VL 64
IS 2
BP 190
EP 192
DI 10.1016/j.ppnp.2009.12.007
PG 3
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 671PN
UT WOS:000283519100007
ER
PT J
AU Avignone, FT
AF Avignone, F. T., III
TI The Majorana Ge-76 double-beta decay project
SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
LA English
DT Review
DE Neutrino properties; Neutrino mass
AB The MAJORANA Project is a research and development activity set up to establish the feasibility and cost of a double-beta decay experiment comprising a one-ton array of Ge detectors fabricated from germanium enriched to about 86% in Ge-76. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Avignone, F. T., III] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA.
[Avignone, F. T., III] Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA.
RP Avignone, FT (reprint author), Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA.
EM avignone@sc.edu
NR 7
TC 3
Z9 3
U1 0
U2 0
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0146-6410
EI 1873-2224
J9 PROG PART NUCL PHYS
JI Prog. Part. Nucl. Phys.
PD APR
PY 2010
VL 64
IS 2
BP 258
EP 260
DI 10.1016/j.ppnp.2009.12.022
PG 3
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 671PN
UT WOS:000283519100023
ER
PT J
AU Steiner, H
AF Steiner, Herbert
CA Daya Bay Collaboration
TI The Daya Bay Experiment to measure Theta(13)
SO PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
LA English
DT Article
DE Neutrinos; Neutrino mixing
AB I present here a brief description of the goals, method and status of the Daya Bay antineutrino oscillation experiment to measure the mixing angle Theta(13). (C) 2010 Elsevier B.V. All rights reserved.
C1 [Steiner, Herbert; Daya Bay Collaboration] Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Steiner, H (reprint author), Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
EM hmsteiner@lbl.gov
NR 0
TC 1
Z9 1
U1 1
U2 2
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0146-6410
J9 PROG PART NUCL PHYS
JI Prog. Part. Nucl. Phys.
PD APR
PY 2010
VL 64
IS 2
BP 342
EP 345
DI 10.1016/j.ppnp.2009.12.044
PG 4
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 671PN
UT WOS:000283519100045
ER
PT J
AU Olea, C
Herzik, MA
Kuriyan, J
Marletta, MA
AF Olea, Charles, Jr.
Herzik, Mark A., Jr.
Kuriyan, John
Marletta, Michael A.
TI Structural insights into the molecular mechanism of H-NOX activation
SO PROTEIN SCIENCE
LA English
DT Article
DE nitric oxide activation; signal transduction; crystallography;
Heme-Nitric oxide/Oxygen-binding proteins
ID SOLUBLE GUANYLATE-CYCLASE; NITRIC-OXIDE; SHEWANELLA-ONEIDENSIS;
RESOLUTION STRUCTURES; NONPLANAR PORPHYRINS; HISTIDINE KINASE; HEME
DISTORTION; LIGAND; NITROPHORIN-4; COMPLEXES
AB Nitric oxide (NO) signaling in mammals controls important processes such as smooth muscle relaxation and neurotransmission by the activation of soluble guanylate cyclase (sGC). NO binding to the heme domain of sGC leads to dissociation of the iron-histidine (Fe-His) bond, which is required for enzyme activity. The heme domain of sGC belongs to a larger class of proteins called H-NOX (Heme-Nitric oxide/OXygen) binding domains. Previous crystallographic studies on H-NOX domains demonstrate a correlation between heme bending and protein conformation. It was unclear, however, whether these structural changes were important for signal transduction. Subsequent NMR solution structures of H-NOX proteins show a conformational change upon disconnection of the heme and proximal helix, similar to those observed in the crystallographic studies. The atomic details of these conformational changes, however, are lacking in the NMR structures especially at the heme pocket. Here, a high-resolution crystal structure of an H-NOX mutant mimicking a broken Fe-His bond is reported. This mutant exhibits specific changes in heme conformation and major N-terminal displacements relative to the wild-type H-NOX protein. Fe-His ligation is ubiquitous in all H-NOX domains, and therefore, the heme and protein conformational changes observed in this study are likely to occur throughout the H-NOX family when NO binding leads to rupture of the Fe-His bond.
C1 [Marletta, Michael A.] Univ Calif Berkeley, Dept Mol & Cell Biol, Inst QB3, Berkeley, CA 94720 USA.
[Olea, Charles, Jr.; Herzik, Mark A., Jr.; Kuriyan, John; Marletta, Michael A.] Univ Calif Berkeley, Calif Inst Quantitat Biosci, Berkeley, CA 94720 USA.
[Kuriyan, John; Marletta, Michael A.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Kuriyan, John] Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA.
[Kuriyan, John; Marletta, Michael A.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys Biosci, Berkeley, CA 94720 USA.
RP Marletta, MA (reprint author), Univ Calif Berkeley, Dept Mol & Cell Biol, Inst QB3, 570 Stanley Hall, Berkeley, CA 94720 USA.
EM marletta@berkeley.edu
FU National Institutes of Health [GM070671]
FX Grant sponsor: National Institutes of Health; Grant number: GM070671
NR 28
TC 18
Z9 18
U1 0
U2 5
PU JOHN WILEY & SONS INC
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN, NJ 07030 USA
SN 0961-8368
J9 PROTEIN SCI
JI Protein Sci.
PD APR
PY 2010
VL 19
IS 4
BP 881
EP 887
DI 10.1002/pro.357
PG 7
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 578DY
UT WOS:000276274900023
PM 20162612
ER
PT J
AU Rhodes, J
Leauthaud, A
Stoughton, C
Massey, R
Dawson, K
Kolbe, W
Roe, N
AF Rhodes, Jason
Leauthaud, Alexie
Stoughton, Chris
Massey, Richard
Dawson, Kyle
Kolbe, William
Roe, Natalie
TI The Effects of Charge Transfer Inefficiency (CTI) on Galaxy Shape
Measurements
SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
LA English
DT Article
ID HUBBLE-SPACE-TELESCOPE; P-CHANNEL CCDS; TRANSFER EFFICIENCY; ADVANCED
CAMERA; COSMIC SHEAR; WEAK; PERFORMANCE; ENERGY; DAMAGE
AB We examine the effects of charge transfer inefficiency (CTI) during CCD readout on the demanding galaxy shape measurements required by studies of weak gravitational lensing. We simulate a CCD readout with CTI such as that caused by charged particle radiation damage in space-based detectors. We verify our simulations on real data from fully depleted p-channel CCDs that have been deliberately irradiated in a laboratory. We show that only charge traps with time constants of the same order as the time between rowtransfers during readout affect galaxy shape measurements. We simulate deep astronomical images and the process of CCD readout, characterizing the effects of CTI on various galaxy populations. Our code and methods are general and can be applied to any CCDs, once the density and characteristic release times of their charge trap species are known. We baseline our study around p-channel CCDs that have been shown to have charge transfer efficiency up to an order of magnitude better than several models of n-channel CCDs designed for space applications. We predict that for galaxies furthest from the readout registers, bias in the measurement of galaxy shapes, Delta e, will increase at a rate of (2.65 +/- 0.02) x 10(-4) yr(-1) at L2 for accumulated radiation exposure averaged over the solar cycle. If uncorrected, this will consume the entire shape measurement error budget of a dark energy mission surveying the entire extragalactic sky within about 4 yr of accumulated radiation damage. However, software mitigation techniques demonstrated elsewhere can reduce this by a factor of similar to 10, bringing the effect well below mission requirements. This conclusion is valid only for the p-channel CCDs we have modeled; CCDs with higher CTI will fare worse and may not meet the requirements of future dark energy missions. We also discuss additional ways in which hardware could be designed to further minimize the impact of CTI.
C1 [Rhodes, Jason] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.
[Rhodes, Jason] CALTECH, Pasadena, CA 91125 USA.
[Leauthaud, Alexie; Kolbe, William; Roe, Natalie] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
[Leauthaud, Alexie] Univ Calif Berkeley, Berkeley Ctr Cosmol Phys, Berkeley, CA 94720 USA.
[Stoughton, Chris] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Massey, Richard] Royal Observ Edinburgh, Edinburgh EH9 3HJ, Midlothian, Scotland.
[Dawson, Kyle] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA.
RP Rhodes, J (reprint author), CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.
EM jason.d.rhodes@jpl.nasa.gov
FU US Department of Energy [DE-AC02-05CH11231]; STFC [PP/E006450/1]; FP7
[MIRG-CT-208994]; Office of Science at LBNL; Fermilab
FX This work was supported in part by the Jet Propulsion Laboratory,
operated by the California Institute of Technology under a contract with
NASA. This work was also supported by the US Department of Energy under
contract DE-AC02-05CH11231. We thank Chris Bebek, Mike Lampton, Michael
Levi, and Roger Smith for useful discussions about CCDs and CTE. A. L.
acknowledges support from the Chamberlain Fellowship at LBNL and from
the Berkeley Center for Cosmological Physics. R. M. is supported by STFC
Advanced Fellowship PP/E006450/1 and FP7 grant MIRG-CT-208994. C. S. was
supported by funding from the Office of Science at LBNL and Fermilab.
NR 45
TC 28
Z9 28
U1 0
U2 2
PU UNIV CHICAGO PRESS
PI CHICAGO
PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA
SN 0004-6280
J9 PUBL ASTRON SOC PAC
JI Publ. Astron. Soc. Pac.
PD APR
PY 2010
VL 122
IS 890
BP 439
EP 450
PG 12
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 573AO
UT WOS:000275881000005
ER
PT J
AU Scherler, D
Bookhagen, B
Strecker, MR
von Blanckenburg, F
Rood, D
AF Scherler, Dirk
Bookhagen, Bodo
Strecker, Manfred R.
von Blanckenburg, Friedhelm
Rood, Dylan
TI Timing and extent of late Quaternary glaciation in the western Himalaya
constrained by Be-10 moraine dating in Garhwal, India
SO QUATERNARY SCIENCE REVIEWS
LA English
DT Article
ID HOLOCENE GLACIER FLUCTUATIONS; EQUILIBRIUM-LINE ALTITUDES; ABRUPT
CLIMATE-CHANGE; EURASIAN SNOW COVER; MASS-BALANCE; HIGH-RESOLUTION;
ASIAN MONSOON; ENVIRONMENTAL-CHANGES; COSMOGENIC NUCLIDES; SATELLITE
IMAGERY
AB Glacial chronologies from the Himalayan region indicate various degrees of asynchronous glacial behavior Part of this has been related to different sensitivities of glaciers situated in contrasting climatic compartments of the orogen, but so far field data in support for this hypothesis is lacking. Here, we present a new Be-10-derived glacial chronology for the upper Tons valley in western Garhwal, India, and initial results for the Pin and Thangi valleys in eastern Himachal Pradesh. These areas cover a steep gradient in orographic precipitation and allow testing for different climatic sensitivities. Our data provide a record of five glacial episodes at similar to 16 ka. similar to 11-12 ka. similar to 8-9 ka. similar to 5 ka, and <1 ka. In the Thangi our results indicate a glacial episode at 19 ka, but no data are available for younger glacial deposits in this valley At their largest mapped extent ( 16 ka), the two main glaciers in the upper Tons valley joined and descended down to similar to 2500 m asl, which represents a drop of similar to 1400 m compared to the present-day glacial extent. During the Holocene the two largest glaciers produced distinct glacial landforms that allowed us to reconstruct changes in the Equilibrium Line Altitude (ELA) over similar to 20 km north-south distance that is presently associated with a steep gradient in rainfall We observe that ELA-changes have been consistently similar to 2 times higher for the glacier located in a presently wetter climate, pointing at different climate sensitivities, related to the amount of precipitation that they receive. At regional scale. our data is in reasonable agreement with other published glacial chronologies from the western Himalaya and suggest that glacial advances during the Holocene have been largely synchronous in this region Comparison of glacial chronologies from the western Himalaya with other palaeoclimatic proxy data suggests that long-term changes in glacial extents are controlled by glacial-interglacial temperature oscillations related to the waxing and waning of the large northern-hemisphere ice sheets, while the timing of millennial-scale advance-and-retreat cycles are more directly related to monsoon strength (C) 2009 Elsevier Ltd. All rights reserved
C1 [Scherler, Dirk; Strecker, Manfred R.] Univ Potsdam, Inst Geowissensch, D-14476 Potsdam, Germany.
[Bookhagen, Bodo] Univ Calif Santa Barbara, Dept Geog, Santa Barbara, CA 93106 USA.
[von Blanckenburg, Friedhelm] Leibniz Univ Hannover, Inst Mineral, D-30167 Hannover, Germany.
[Rood, Dylan] Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA.
RP Scherler, D (reprint author), Univ Potsdam, Inst Geowissensch, Karl Liebknecht Str 24, D-14476 Potsdam, Germany.
RI Bookhagen, Bodo/A-1389-2012; von Blanckenburg, Friedhelm/K-4711-2013;
Scherler, Dirk/G-2066-2016
OI Bookhagen, Bodo/0000-0003-1323-6453; von Blanckenburg,
Friedhelm/0000-0002-2964-717X; Scherler, Dirk/0000-0003-3911-2803
FU German Science Foundation (DFG, Deutsche Forschungsgemeinschaft)
[GRK1364]
FX This research was funded by a scholarship to D.S. within the graduate
school GRK1364 funded by the German Science Foundation (DFG, Deutsche
Forschungsgemeinschaft). We are grateful for invaluable help from Tashi
Tsering during fieldwork and field assistance by Alexander Rohrmann and
the people from Osla and Sankri villages in the upper Tons valley. We
thank L. Owen and an anonymous reviewer for their comments. SPOT images
were kindly provided by the EU financed O.A.S.I.S. program.
NR 100
TC 34
Z9 36
U1 1
U2 15
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0277-3791
J9 QUATERNARY SCI REV
JI Quat. Sci. Rev.
PD APR
PY 2010
VL 29
IS 7-8
BP 815
EP 831
DI 10.1016/j.quascirev.2009.11.031
PG 17
WC Geography, Physical; Geosciences, Multidisciplinary
SC Physical Geography; Geology
GA 584JY
UT WOS:000276749200001
ER
PT J
AU Perdian, DC
Cha, S
Oh, J
Sakaguchi, DS
Yeung, ES
Lee, YJ
AF Perdian, D. C.
Cha, Sangwon
Oh, Jisun
Sakaguchi, Donald S.
Yeung, Edward S.
Lee, Young Jin
TI In situ probing of cholesterol in astrocytes at the single-cell level
using laser desorption ionization mass spectrometric imaging with
colloidal silver
SO RAPID COMMUNICATIONS IN MASS SPECTROMETRY
LA English
DT Article
ID PERFORMANCE LIQUID-CHROMATOGRAPHY; ABLATION ELECTROSPRAY-IONIZATION;
FLUORESCENCE MICROSCOPY; ENZYMATIC DETERMINATION; ARABIDOPSIS-THALIANA;
SMALL MOLECULES; BRAIN-TISSUE; LIPID RAFTS; MALDI-MS; MEMBRANES
AB Mass spectrometric imaging has been utilized to localize individual astrocytes and to obtain cholesterol populations at the single-cell level in laser desorption ionization (LDI) with colloidal silver. The silver ion adduct of membrane-bound cholesterol was monitored to detect individual cells. Good correlation between mass spectrometric and optical images at different cell densities indicates the ability to perform single-cell studies of cholesterol abundance. The feasibility of quantification is confirmed by the agreement between the LDI-MS ion signals and the results from a traditional enzymatic fluorometric assay. We propose that this approach could be an effective tool to study chemical populations at the cellular level. Published in (C) 2010 by John Wiley & Sons, Ltd.
C1 [Perdian, D. C.; Cha, Sangwon; Yeung, Edward S.; Lee, Young Jin] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA.
[Perdian, D. C.; Cha, Sangwon; Yeung, Edward S.; Lee, Young Jin] Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
[Oh, Jisun; Sakaguchi, Donald S.] Iowa State Univ, Dept Genet Dev & Cell Biol, Ames, IA 50011 USA.
RP Lee, YJ (reprint author), Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA.
EM yjlee@iastate.edu
RI Cha, Sangwon/C-6917-2008; Lee, Young Jin/F-2317-2011
OI Cha, Sangwon/0000-0003-2819-3417; Lee, Young Jin/0000-0002-2533-5371
FU U. S. Department of Energy, Office of Basic Energy Sciences, Division of
Chemical Sciences; DOE [DE-AC02-07CI-111358]
FX We thank Ksenija Jeftinija and Srdija Jeftinija for help with the
astrocyte samples in our initial work. This work was supported by the U.
S. Department of Energy, Office of Basic Energy Sciences, Division of
Chemical Sciences. The Ames Laboratory is operated by Iowa State
University of Science and Technology under DOE Contract
#DE-AC02-07CI-111358.
NR 46
TC 10
Z9 10
U1 1
U2 11
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0951-4198
EI 1097-0231
J9 RAPID COMMUN MASS SP
JI Rapid Commun. Mass Spectrom.
PD APR
PY 2010
VL 24
IS 8
BP 1147
EP 1154
DI 10.1002/rcm.4491
PG 8
WC Biochemical Research Methods; Chemistry, Analytical; Spectroscopy
SC Biochemistry & Molecular Biology; Chemistry; Spectroscopy
GA 584TJ
UT WOS:000276775700005
PM 20301106
ER
PT J
AU Smith, C
Kelly, D
Dezfuli, H
AF Smith, Curtis
Kelly, Dana
Dezfuli, Homayoon
TI Probability-informed testing for reliability assurance through Bayesian
hypothesis methods
SO RELIABILITY ENGINEERING & SYSTEM SAFETY
LA English
DT Article
DE Bayesian inference; Reliability; Hypothesis testing; System analysis;
Cost; MCMC; Probability level
AB Bayesian inference techniques play a central role in modern risk and reliability evaluations of complex engineering systems. These techniques allow the system performance data and any relevant associated information to be used collectively to calculate the probabilities of various types of hypotheses that are formulated as part of reliability assurance activities. This paper proposes a methodology based on Bayesian hypothesis testing to determine the number of tests that would be required to demonstrate that a system-level reliability target is met with a specified probability level. Recognizing that full-scale testing of a complex system is often not practical, testing schemes are developed at the subsystem level to achieve the overall system reliability target. The approach uses network modeling techniques to transform the topology of the system into logic structures consisting of series and parallel subsystems. The paper addresses the consideration of cost in devising subsystem level test schemes. The developed techniques are demonstrated using several examples. All analyses are carried out using the Bayesian analysis tool WinBUGS, which uses Markov chain Monte Carlo simulation methods to carry out inference over the network. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Smith, Curtis; Kelly, Dana] Idaho Natl Lab, Idaho Falls, ID 83415 USA.
[Dezfuli, Homayoon] NASA, Washington, DC 20546 USA.
RP Smith, C (reprint author), Idaho Natl Lab, Idaho Falls, ID 83415 USA.
EM Curtis.Smith@inl.gov
FU Battelle Energy Alliance, LLC (BEA) [DE-AC07-05ID14517]
FX This paper has been authorized by Battelle Energy Alliance, LLC (BEA)
under Contract no. DE-AC07-05ID14517 with the US Department of Energy.
The Government and BEA make no express or implied warranty as to the
conditions of the research or any intellectual property, generated
information, or product made or developed under this technical
assistance project, or the ownership, merchantability, or fitness for a
particular purpose of the research or resulting product; that the goods,
services, materials, products, processes, information, or data to be
furnished hereunder will accomplish intended results or are safe for any
purpose including the intended purpose; or that any of the above will
not interfere with privately owned rights of others. Neither the
Government nor BEA shall be liable for special, consequential, nor
incidental damages attributed to such research or resulting product,
intellectual property, generated information, or product made or
delivered under this technical assistance project.
NR 15
TC 2
Z9 2
U1 1
U2 12
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0951-8320
J9 RELIAB ENG SYST SAFE
JI Reliab. Eng. Syst. Saf.
PD APR
PY 2010
VL 95
IS 4
BP 361
EP 368
DI 10.1016/j.ress.2009.11.006
PG 8
WC Engineering, Industrial; Operations Research & Management Science
SC Engineering; Operations Research & Management Science
GA 571UK
UT WOS:000275781100006
ER
PT J
AU Feng, YJ
Jaramillo, R
Wang, JY
Ren, Y
Rosenbaum, TF
AF Feng, Yejun
Jaramillo, R.
Wang, Jiyang
Ren, Yang
Rosenbaum, T. F.
TI Invited Article: High-pressure techniques for condensed matter physics
at low temperature
SO REVIEW OF SCIENTIFIC INSTRUMENTS
LA English
DT Article
DE fluorescence; helium; high-pressure effects; organic compounds; ruby;
spectral line shift; X-ray diffraction
ID X-RAY-DIFFRACTION; ELASTIC-CONSTANTS; FLUORESCENCE LINE; SINGLE-CRYSTAL;
100 KBAR; RUBY; STRESS; CALIBRATION; CHROMIUM; SILVER
AB Condensed matter experiments at high pressure accentuate the need for accurate pressure scales over a broad range of temperatures, as well as placing a premium on a homogeneous pressure environment. However, challenges remain in diamond anvil cell technology, including both the quality of various pressure transmitting media and the accuracy of secondary pressure scales at low temperature. We directly calibrate the ruby fluorescence R1 line shift with pressure at T=4.5 K using high-resolution x-ray powder diffraction measurements of the silver lattice constant and its known equation of state up to P=16 GPa. Our results reveal a ruby pressure scale at low temperatures that differs by 6% from the best available ruby scale at room T. We also use ruby fluorescence to characterize the pressure inhomogeneity and anisotropy in two representative and commonly used pressure media, helium and methanol:ethanol 4:1, under the same preparation conditions for pressures up to 20 GPa at T=5 K. Contrary to the accepted wisdom, both media show equal levels of pressure inhomogeneity measured over the same area, with a consistent Delta P/P per unit area of +/- 1.8 %/(10(4) mu m(2)) from 0 to 20 GPa. The helium medium shows an essentially constant deviatoric stress of 0.021 +/- 0.011 GPa up to 16 GPa, while the methanol:ethanol mixture shows a similar level of anisotropy up to 10 GPa, above which the anisotropy increases. The quality of both pressure media is further examined under the more stringent requirements of single crystal x-ray diffraction at cryogenic temperature. For such experiments we conclude that the ratio of sample-to-pressure chamber volume is a critical parameter in maintaining sample quality at high pressure, and may affect the choice of pressure medium.
C1 [Feng, Yejun; Ren, Yang] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[Feng, Yejun; Wang, Jiyang; Rosenbaum, T. F.] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA.
[Feng, Yejun; Wang, Jiyang; Rosenbaum, T. F.] Univ Chicago, Dept Phys, Chicago, IL 60637 USA.
[Jaramillo, R.] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA.
RP Feng, YJ (reprint author), Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RI Feng, Yejun/A-5417-2009;
OI Feng, Yejun/0000-0003-3667-056X; , /0000-0003-3116-6719
FU National Science Foundation-Earth Sciences [EAR-0622171]; U.S.
Department of Energy-Geosciences [DE-FG02-94ER14466]; National Science
Foundation-Division of Materials Research [DMR-0907025]; U.S. DOE-BES
[DE-AC02-06CH11357]
FX We acknowledge discussions and technical help from V. Prakapenka and P.
Dera, and the use of the helium loading facility at GeoSoilEnviroCARS
(Sector 13), Advanced Photon Source, Argonne National Laboratory. We are
also grateful to I. Steele for the ion microprobe characterization of
the Alfa Aesar ruby specimen, and D. Heinz for discussion of the Birch
equations. In addition, we thank the staff of Sector 4 at the Advanced
Photon Source, specifically J. Lang and Z. Islam for their help with
x-ray diffraction, and D. Haskel and N. Souza-Neto for their help with
the ruby spectrometer. GSE-CARS was supported by the National Science
Foundation-Earth Sciences (Grant No. EAR-0622171) and U. S. Department
of Energy-Geosciences (Grant No. DE-FG02-94ER14466). The work at the
University of Chicago was supported by the National Science
Foundation-Division of Materials Research (Grant No. DMR-0907025). Use
of the Advanced Photon Source was supported by the U. S. DOE-BES under
Contract No. DE-AC02-06CH11357.
NR 35
TC 22
Z9 22
U1 4
U2 27
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0034-6748
EI 1089-7623
J9 REV SCI INSTRUM
JI Rev. Sci. Instrum.
PD APR
PY 2010
VL 81
IS 4
AR 041301
DI 10.1063/1.3400212
PG 8
WC Instruments & Instrumentation; Physics, Applied
SC Instruments & Instrumentation; Physics
GA 590QW
UT WOS:000277243100001
PM 20441318
ER
PT J
AU Mckee, KJ
Smith, EA
AF Mckee, Kristopher J.
Smith, Emily A.
TI Development of a scanning angle total internal reflection Raman
spectrometer
SO REVIEW OF SCIENTIFIC INSTRUMENTS
LA English
DT Article
DE optical microscopes; Raman spectroscopy
ID THIN-FILMS; SPECTROSCOPY; ADSORPTION; SURFACE; MICROSCOPY; SCATTERING;
SPECTRA
AB A scanning angle total internal reflection (SATIR) Raman spectrometer has been developed for measuring interfacial phenomena with chemical specificity and high axial resolution perpendicular to the interface. The instrument platform is an inverted optical microscope with added automated variable angle optics to control the angle of an incident laser on a prism/sample interface. These optics include two motorized translation stages, the first containing a focusing lens and the second a variable angle galvanometer mirror. The movement of all instrument components is coordinated to ensure that the same sample location and area are probed at each angle. At angles greater than the critical angle, an evanescent wave capable of producing Raman scatter is generated in the sample. The Raman scatter is collected by a microscope objective and directed to a dispersive spectrometer and charge-coupled device detector. In addition to the collected Raman scatter, light reflected from the prism/sample interface is collected to provide calibration parameters that enable modeling the distance over which the Raman scatter is collected for depth profiling measurements. The developed instrument has an incident angle range of 25.5 degrees-75.5 degrees, with a 0.05 degrees angle resolution. Raman scatter can be collected from a ZnSe/organic interface over a range of roughly 35-180 nm. Far from the critical angle, the achieved axial resolution perpendicular to the focal plane is approximately 34 nm. This is roughly a 30-fold improvement relative to confocal Raman microscopy.
C1 [Mckee, Kristopher J.] US DOE, Ames Lab, Ames, IA 50011 USA.
Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
RP Mckee, KJ (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA.
EM esmith1@iastate.edu
OI Smith, Emily/0000-0001-7438-7808
FU Department of Energy-Basic Energy Sciences [DE-AC02-07CH11358]
FX Work at the Ames Laboratory was supported by the Department of
Energy-Basic Energy Sciences under Contract No. DE-AC02-07CH11358.
NR 19
TC 11
Z9 11
U1 2
U2 14
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0034-6748
J9 REV SCI INSTRUM
JI Rev. Sci. Instrum.
PD APR
PY 2010
VL 81
IS 4
AR 043106
DI 10.1063/1.3378682
PG 6
WC Instruments & Instrumentation; Physics, Applied
SC Instruments & Instrumentation; Physics
GA 590QW
UT WOS:000277243100007
PM 20441324
ER
PT J
AU Xie, M
Lee, CH
Wang, JS
Yap, YK
Bruno, P
Gruen, D
Singh, D
Routbort, J
AF Xie, Ming
Lee, Chee Huei
Wang, Jiesheng
Yap, Yoke Khin
Bruno, Paola
Gruen, Dieter
Singh, Dileep
Routbort, Jules
TI Induction annealing and subsequent quenching: Effect on the
thermoelectric properties of boron-doped nanographite ensembles
SO REVIEW OF SCIENTIFIC INSTRUMENTS
LA English
DT Article
DE annealing; boron; doping; graphite; nanostructured materials; quenching
(thermal); thermoelectric power
ID ELECTRONIC-STRUCTURE; GRAPHITE; FURNACE
AB Boron-doped nanographite ensembles (NGEs) are interesting thermoelectric nanomaterials for high temperature applications. Rapid induction annealing and quenching has been applied to boron-doped NGEs using a relatively low-cost, highly reliable, laboratory built furnace to show that substantial improvements in thermoelectric power factors can be achieved using this methodology. Details of the design and performance of this compact induction furnace as well as results of the thermoelectric measurements will be reported here.
C1 [Xie, Ming; Lee, Chee Huei; Wang, Jiesheng; Yap, Yoke Khin] Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA.
[Bruno, Paola; Gruen, Dieter] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Singh, Dileep] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA.
[Routbort, Jules] Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA.
RP Xie, M (reprint author), Michigan Technol Univ, Dept Phys, Houghton, MI 49931 USA.
EM ykyap@mtu.edu; dmgruen@anl.gov
RI xie, ming/A-1438-2012; bruno, paola/G-5786-2011; Lee, Chee
Huei/C-3718-2014;
OI Yap, Yoke Khin/0000-0002-1224-4120
FU U.S. Department of Energy, BES-Materials Sciences and Engineering
[DE-FG02-06ER46294]; EERE Office of Vehicle Technologies
[DE-AC02-06CH11357]; Argonne National Laboratory [7F-00961]; National
Science Foundation [DMR 0447555]
FX Work supported by the U.S. Department of Energy, BES-Materials Sciences
and Engineering, and the EERE Office of Vehicle Technologies under
Contract No. DE-AC02-06CH11357. Y.K.Y. acknowledges support from the
Argonne National Laboratory (Contract No. 7F-00961, Ming Xie Appointment
at ANL from May 2007-May 2010), the U.S. Department of Energy,
BES-Materials Sciences and Engineering (Contract No. DE-FG02-06ER46294),
and the National Science Foundation (CAREER Grant No. DMR 0447555)
NR 13
TC 1
Z9 1
U1 1
U2 5
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0034-6748
J9 REV SCI INSTRUM
JI Rev. Sci. Instrum.
PD APR
PY 2010
VL 81
IS 4
AR 043909
DI 10.1063/1.3378681
PG 6
WC Instruments & Instrumentation; Physics, Applied
SC Instruments & Instrumentation; Physics
GA 590QW
UT WOS:000277243100035
PM 20441352
ER
PT J
AU Yearley, EJ
Sasa, LA
Welch, CF
Taylor, MA
Kupcho, KM
Gilbertson, RD
Hjelm, RP
AF Yearley, Eric J.
Sasa, Leslie A.
Welch, Cynthia F.
Taylor, Mark A.
Kupcho, Kevin M.
Gilbertson, Robert D.
Hjelm, Rex P.
TI The Couette configuration of the Los Alamos Neutron Science Center
Neutron Rheometer for the investigation of polymers in the bulk via
small-angle neutron scattering
SO REVIEW OF SCIENTIFIC INSTRUMENTS
LA English
DT Article
DE liquid structure; neutron diffraction; polymer melts
ID LINEAR ENTANGLED POLYMERS; FLOW VISUALIZATION; MICROSCOPIC THEORY;
MOLECULAR THEORY; DYNAMICS; SHEAR; MELTS; SYSTEMS; APPARATUS; CHAIN
AB A neutron rheometer in the Couette geometry has been built at the Los Alamos Neutron Science Center to examine the molecular steady-state and dynamic responses of entangled polymeric materials in the bulk under the application of shear stress via small-angle neutron scattering. Although similar neutron rheometers have been fabricated elsewhere, this new design operates under the extreme conditions required for measuring the structure and behavior of high molecular weight polymer melts. Specifically, the rheometer achieves high torques (200 N m) and shear rates (865 s(-1)) simultaneously, never before attainable with other neutron rheometers at temperatures up to 240 degrees C under an inert gas environment. The design of the instrument is such that relatively small sample sizes are required. The testing of the Los Alamos Neutron Science Center Neutron Rheometer in the Couette design both as a rheometer and in the small-angle neutron optical configuration on highly viscous polystyrene is presented. The observed anisotropic neutron scattering pattern of the polystyrene melt at a molecular weight above entanglement provides evidence that the conformation of the polymer chains are elongated in the direction of the melt flow, in agreement with the current theories concerning linear polymers in the bulk.
C1 [Yearley, Eric J.; Sasa, Leslie A.; Taylor, Mark A.; Kupcho, Kevin M.; Hjelm, Rex P.] Los Alamos Natl Lab, Los Alamos Neutron Scattering Ctr, Los Alamos, NM 87545 USA.
[Sasa, Leslie A.] Univ Calif Los Angeles, Dept Mech & Aerosp Engn, Los Angeles, CA 90095 USA.
[Welch, Cynthia F.; Gilbertson, Robert D.] Los Alamos Natl Lab, Mat Sci & Technol Div Polymers & Coatings, Los Alamos, NM 87545 USA.
RP Hjelm, RP (reprint author), Los Alamos Natl Lab, Los Alamos Neutron Scattering Ctr, Los Alamos, NM 87545 USA.
EM hjelm@lanl.gov
RI Lujan Center, LANL/G-4896-2012;
OI Welch, Cynthia/0000-0002-4638-6434
FU National Physical Science Consortium; Department of Energy's Office of
Basic Energy Sciences; [W-7405-ENG-36]
FX The authors thank Dr. Debra A. Wrobleski for the determination of the
molecular weight distribution of our polystyrene samples and Dr. Edward
B. Orler for the fruitful discussions concerning the rheological
properties of our samples. We thank Professor Sandy Sternstein for the
most valuable discussions. We also thank Danny Olivas, Robert Merl, Alan
Shapiro, Kelly Knickerbocker and Dr. Paul Lewis for the construction and
support of the LNR control systems. We furthermore thank David Bonal
from National Instruments for his support in the critical modifications
of our LABVIEW programs. The authors also thank Melvin Borrego, Tim
Medina, Michael Torrez and Joshua Martinez for their assistance during
the experimental process. L.A.S. would like to gratefully acknowledge
the National Physical Science Consortium for their financial support.
This work was supported by the use of the Lujan Neutron Scattering
Center at the Los Alamos Neutron Science Center, which is funded by the
Department of Energy's Office of Basic Energy Sciences. Los Alamos
National Laboratory operated by the University of California under
Contract No. W-7405-ENG-36 and subsequently by Los Alamos National
Security LLC under DOE Contract No. DE-AC52-06NA25396.
NR 47
TC 3
Z9 3
U1 0
U2 4
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0034-6748
EI 1089-7623
J9 REV SCI INSTRUM
JI Rev. Sci. Instrum.
PD APR
PY 2010
VL 81
IS 4
AR 045109
DI 10.1063/1.3374121
PG 7
WC Instruments & Instrumentation; Physics, Applied
SC Instruments & Instrumentation; Physics
GA 590QW
UT WOS:000277243100053
PM 20441370
ER
PT J
AU Kuhl, AL
Reichenbach, H
AF Kuhl, A. L.
Reichenbach, H.
TI Barometric calorimeters
SO RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
AB A barometric calorimeter technique has been developed to characterize the temporal evolution of combustion in confined explosions. By comparing pressure measurements for explosions in air versus nitrogen, one can make visible the gasdynamic (pressure) consequences of the exothermic energy release. The late-time chamber pressure measurement is used to evaluate the final mass-fraction of products produced by combustion. Combustion completeness varied from 50-89% over a wide range of stoichiometrics. A thermodynamic model of combustion in a calorimeter is proposed. The model was applied to the TNT-air system; chamber pressures varied between 1 bar and 1 kbar for fuel mass-fractions between 1 and 99%. Chamber temperature reached a maximum of 2.099 K at a fuel mass loading of 36%. We will show that combustion is a more-effective energy release mechanism for creating high temperatures and pressures in a confined explosion than the detonation mechanism.
C1 [Kuhl, A. L.] Lawrence Livermore Natl Lab, Livermore, CA USA.
[Reichenbach, H.] Ernst Mach Inst, Fraunhofer Inst Kurzzeitdynam, Freiburg, Germany.
RP Kuhl, AL (reprint author), Lawrence Livermore Natl Lab, Livermore, CA USA.
EM kuhl2@llnl.gov
FU U.S. Department of Energy [DE-AC52-07NA27344]; Defense Threat Reduction
Agency [IACRO 08-43991]
FX This work was performed under the auspices of the U.S. Department of
Energy by Lawrence Livermore National Laboratory under Contract
DE-AC52-07NA27344. The work was sponsored by the Defense Threat
Reduction Agency under IACRO 08-43991.
NR 6
TC 3
Z9 3
U1 0
U2 2
PU MAIK NAUKA/INTERPERIODICA/SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013-1578 USA
SN 1990-7931
J9 RUSS J PHYS CHEM B+
JI Russ. J. Phys. Chem. B
PD APR
PY 2010
VL 4
IS 2
BP 271
EP 278
DI 10.1134/S1990793110020132
PG 8
WC Physics, Atomic, Molecular & Chemical
SC Physics
GA 600CA
UT WOS:000277959700013
ER
PT J
AU Wiley, S
AF Wiley, Steven
TI Down with Reviews
SO SCIENTIST
LA English
DT Editorial Material
C1 Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA.
RP Wiley, S (reprint author), Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA.
NR 0
TC 2
Z9 2
U1 0
U2 0
PU SCIENTIST INC
PI PHILADELPHIA
PA 400 MARKET ST, STE 1250, PHILADELPHIA, PA 19106 USA
SN 0890-3670
J9 SCIENTIST
JI Scientist
PD APR
PY 2010
VL 24
IS 4
BP 31
EP 31
PG 1
WC Information Science & Library Science; Multidisciplinary Sciences
SC Information Science & Library Science; Science & Technology - Other
Topics
GA 574TX
UT WOS:000276017700018
ER
PT J
AU Wong, T
Suzuki, K
Gibson, M
Ishikawa, K
Aoki, K
Jones, LL
AF Wong, T.
Suzuki, K.
Gibson, M.
Ishikawa, K.
Aoki, K.
Jones, L. L.
TI Hydrogen permeation behavior of multifilamentary Cu-Nb superconducting
composites
SO SCRIPTA MATERIALIA
LA English
DT Article
DE Hydrogen diffusion; Hydrogen permeation membrane; Metallic
superconductors; Copper alloys; Ductility
ID MECHANICAL-PROPERTIES; NI ALLOY; MICROSTRUCTURE; PERMEABILITY;
MEMBRANES; STRENGTH; DEFORMATION; WIRES
AB The hydrogen permeation behavior of Cu-15 vol% Nb and Cu-20 vol.% Nb alloys which were developed originally for superconducting wires has been investigated. Both the alloys with a microstructure consisting of body-centered cubic Nb (bcc-Nb) filaments and a face-centered cubic Cu matrix exhibited a hydrogen permeability of similar to 2 x 10(-9) mol m(-1) s(-1) Pa(-0.5) at 673 K. The samples tested are resistant to hydrogen embrittlement despite the fact that bcc-Nb is susceptible to hydrogen embrittlement. Our work demonstrates that Nb-based multifilamentary alloys are potential candidates for alloy membranes for hydrogen purification. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Wong, T.; Suzuki, K.] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia.
[Gibson, M.] CSIRO Proc Sci & Engn, Clayton, Vic 3169, Australia.
[Ishikawa, K.; Aoki, K.] Kitami Inst Technol, Dept Mat Sci & Engn, Kitami, Hokkaido 0908507, Japan.
[Jones, L. L.] Iowa State Univ, USDOE Met Dev Ames 121, Ames Lab, Mat Preparat Ctr, Ames, IA 50011 USA.
RP Wong, T (reprint author), Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia.
EM timothy.wong@eng.monash.edu.au
RI Suzuki, Kiyonori/A-1284-2008
OI Suzuki, Kiyonori/0000-0002-8659-6786
FU Australian Research Council
FX This work was supported financially by the Australian Research Council
through its Discovery-Projects scheme. Professor J.D. Verhoeven is
gratefully acknowledged for providing the two Cu-Nb samples for this
study. T.W. is thankful to Monash University for their support through
their PhD scholarship scheme.
NR 20
TC 2
Z9 2
U1 0
U2 4
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6462
J9 SCRIPTA MATER
JI Scr. Mater.
PD APR
PY 2010
VL 62
IS 8
BP 582
EP 585
DI 10.1016/j.scriptamat.2009.12.045
PG 4
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 574ET
UT WOS:000275972200015
ER
PT J
AU Wang, YD
Ren, Y
Huang, EW
Wang, G
Nie, ZH
Zuo, L
Liaw, PK
AF Wang, Y. D.
Ren, Y.
Huang, E. W.
Wang, G.
Nie, Z. H.
Zuo, L.
Liaw, P. K.
TI Evidence of two-length-scale kinetics of R-phase transformation by
high-energy X-ray diffraction
SO SCRIPTA MATERIALIA
LA English
DT Article
DE Phase transformation kinetics; X-ray diffraction (XRD); Shape memory
alloy; Martensitic phase transformation; R-phase
ID ALLOYS; CRYSTALS; MEMORY
AB The cubic-to-rhombohedral (C-R) phase transition in an AuCd shape memory alloy was investigated by in situ high-energy X-ray diffraction. We present the first direct experimental evidence of two-length-scale phase transition kinetics in this alloy system. It was further found that aging in the R-phase leads to two-way memory "loss", characterized by the reselection of new variants. We attributed this two-way memory "loss" to the internal stresses caused by the defects formed in the off equilibrium state of the studied AuCd system. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Wang, Y. D.; Nie, Z. H.] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China.
[Ren, Y.] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA.
[Huang, E. W.; Liaw, P. K.] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
[Wang, G.; Zuo, L.] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110004, Peoples R China.
RP Wang, YD (reprint author), Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China.
EM ydwang@bit.edu.cn
RI Nie, Zhihua/G-9459-2013; wang, yandong/G-9404-2013; Huang,
E-Wen/A-5717-2015
OI Nie, Zhihua/0000-0002-2533-933X; Huang, E-Wen/0000-0003-4986-0661
FU National Natural Science Foundation of China [50725102]; National
Science Foundation [DMR-0231320]; US Department of Energy
[DE-AC02-06CH11357]
FX This work is supported by the National Natural Science Foundation of
China (Grant No. 50725102) and the National Science Foundation
International Materials Institutes (IMI) Program (DMR-0231320) with Dr.
C. Huber as the Program Director. The use of the Advanced Photon Source
was supported by the US Department of Energy, Office of Science, Office
of Basic Energy Science, under Contract No. DE-AC02-06CH11357.
NR 19
TC 2
Z9 2
U1 0
U2 5
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6462
J9 SCRIPTA MATER
JI Scr. Mater.
PD APR
PY 2010
VL 62
IS 8
BP 617
EP 620
DI 10.1016/j.scriptamat.2010.01.011
PG 4
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 574ET
UT WOS:000275972200024
ER
PT J
AU Deng, ZQ
Weiland, M
Carlson, T
Eppard, MB
AF Deng, Zhiqun
Weiland, Mark
Carlson, Thomas
Eppard, M. Brad
TI Design and Instrumentation of a Measurement and Calibration System for
an Acoustic Telemetry System
SO SENSORS
LA English
DT Article
DE underwater transducers; piezoelectric sensors; acoustic telemetry
AB The Juvenile Salmon Acoustic Telemetry System (JSATS) is an active sensing technology developed by the U. S. Army Corps of Engineers, Portland District, for detecting and tracking small fish. It is used primarily for evaluating behavior and survival of juvenile salmonids migrating through the Federal Columbia River Power System to the Pacific Ocean. It provides critical data for salmon protection and development of more "fishfriendly" hydroelectric facilities. The objective of this study was to design and build a Measurement and Calibration System (MCS) for evaluating the JSATS components, because the JSATS requires comprehensive acceptance and performance testing in a controlled environment before it is deployed in the field. The MCS consists of a reference transducer, a water test tank lined with anechoic material, a motion control unit, a reference receiver, a signal conditioner and amplifier unit, a data acquisition board, MATLAB control and analysis interface, and a computer. The fully integrated MCS has been evaluated successfully at various simulated distances and using different encoded signals at frequencies within the bandwidth of the JSATS transmitter. The MCS provides accurate acoustic mapping capability in a controlled environment and automates the process that allows real-time measurements and evaluation of the piezoelectric transducers, sensors, or the acoustic fields. The MCS has been in use since 2009 for acceptance and performance testing of, and further improvements to, the JSATS.
C1 [Deng, Zhiqun; Weiland, Mark; Carlson, Thomas] Pacific NW Natl Lab, Richland, WA 99332 USA.
[Eppard, M. Brad] USA, Corps Engineers, Portland, OR 97208 USA.
RP Deng, ZQ (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99332 USA.
EM zhiqun.deng@pnl.gov; Mark.Weiland@pnl.gov; thomas.carlson@pnl.gov;
Matthew.B.Eppard@usace.army.mil
RI Deng, Daniel/A-9536-2011
OI Deng, Daniel/0000-0002-8300-8766
FU U.S. Army Corps of Engineers, Portland District
FX The work described in this article was conducted at Pacific Northwest
National Laboratory (PNNL) in Richland, Washington, which is operated by
Battelle for the U. S. Department of Energy. The authors thank Eric
Choi, Brian LaMarche, Geoff McMichael, Brian Noland, and Tom Seim of
PNNL for their help with this study. Andrea Currie, Jayson Martinez, and
Tao Fu of PNNL provided comments and technical help preparing the
manuscript. This study was funded by the U.S. Army Corps of Engineers,
Portland District.
NR 11
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Z9 20
U1 0
U2 7
PU MOLECULAR DIVERSITY PRESERVATION INTERNATIONAL-MDPI
PI BASEL
PA KANDERERSTRASSE 25, CH-4057 BASEL, SWITZERLAND
SN 1424-8220
J9 SENSORS-BASEL
JI Sensors
PD APR
PY 2010
VL 10
IS 4
BP 3090
EP 3099
DI 10.3390/s100403090
PG 10
WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation
SC Chemistry; Electrochemistry; Instruments & Instrumentation
GA 589OI
UT WOS:000277159700032
PM 22319288
ER
PT J
AU Kusaka, R
Inokuchi, Y
Xantheas, SS
Ebata, T
AF Kusaka, Ryoji
Inokuchi, Yoshiya
Xantheas, Sotiris S.
Ebata, Takayuki
TI Structures and Encapsulation Motifs of Functional Molecules Probed by
Laser Spectroscopic and Theoretical Methods
SO SENSORS
LA English
DT Review
DE supersonic jet; laser spectroscopy; host-guest complex; crown ether;
calixarene
ID CROWN-ETHER COMPLEXES; BASIS-SETS; VIBRATIONAL SPECTROSCOPY;
CALORIMETRIC TITRATION; INFRARED-SPECTROSCOPY; BIVALENT-CATIONS;
AQUEOUS-SOLUTION; SUPERSONIC JETS; 25 DEGREESC; METAL-IONS
AB We report laser spectroscopic and computational studies of host/guest hydration interactions between functional molecules (hosts) and water (guest) in supersonic jets. The examined hosts include dibenzo-18-crown-6-ether (DB18C6), benzo-18-crown-6-ether (B18C6) and calix[4] arene (C4A). The gaseous complexes between the functional molecular hosts and water are generated under jet-cooled conditions. Various laser spectroscopic methods are applied for these species: the electronic spectra are observed by laser-induced fluorescence (LIF), mass-selected resonance enhanced multiphoton ionization (REMPI) and ultraviolet-ultraviolet hole-burning (UV-UV HB) spectroscopy, whereas the vibrational spectra for each individual species are observed by infrared-ultraviolet double resonance (IR-UV DR) spectroscopy. The obained results are analyzed by first principles electronic structure calculations. We discuss the conformations of the host molecules, the structures of the complexes, and key interactions forming the specific complexes.
C1 [Kusaka, Ryoji; Inokuchi, Yoshiya; Ebata, Takayuki] Hiroshima Univ, Dept Chem, Grad Sch Sci, Higashihiroshima 7398526, Japan.
[Xantheas, Sotiris S.] Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
RP Ebata, T (reprint author), Hiroshima Univ, Dept Chem, Grad Sch Sci, Kagamiyama 1-3-1, Higashihiroshima 7398526, Japan.
EM d096443@hiroshima-u.ac.jp; y-inokuchi@hiroshima-u.ac.jp;
sotiris.xantheas@pnl.gov; tebata@hiroshima-u.ac.jp
RI Inokuchi, Yoshiya/D-4681-2013; Xantheas, Sotiris/L-1239-2015;
OI Inokuchi, Yoshiya/0000-0001-7959-5315; Xantheas,
Sotiris/0000-0002-6303-1037
FU JSPS [18205003]; MEXT [477]; Chemical Sciences, Geosciences and
Biosciences Division, Office of Basic Energy Sciences, US Department of
Energy; Department of Energy's Office of Biological and Environmental
Research
FX T.E. acknowledges JSPS for the support through a Grant-in-Aid project
(No. 18205003) and MEXT for the support through a Grant-in-Aid for the
Scientific Research on Priority Area "Molecular Science for Supra
Functional Systems" (No. 477). Part of this work is supported by the
Chemical Sciences, Geosciences and Biosciences Division, Office of Basic
Energy Sciences, US Department of Energy. Battelle operates the Pacific
Northwest National Laboratory for the U.S. Department of Energy. This
research was performed in part using the Molecular Science Computing
Facility (MSCF) in the Environmental Molecular Sciences Laboratory, a
national scientific user facility sponsored by the Department of
Energy's Office of Biological and Environmental Research.
NR 57
TC 14
Z9 14
U1 0
U2 10
PU MOLECULAR DIVERSITY PRESERVATION INTERNATIONAL-MDPI
PI BASEL
PA KANDERERSTRASSE 25, CH-4057 BASEL, SWITZERLAND
SN 1424-8220
J9 SENSORS-BASEL
JI Sensors
PD APR
PY 2010
VL 10
IS 4
BP 3519
EP 3548
DI 10.3390/s100403519
PG 30
WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation
SC Chemistry; Electrochemistry; Instruments & Instrumentation
GA 589OI
UT WOS:000277159700054
PM 22319310
ER
PT J
AU Loui, A
Sirbuly, DJ
Elhadj, S
McCall, SK
Hart, BR
Ratto, TV
AF Loui, A.
Sirbuly, D. J.
Elhadj, S.
McCall, S. K.
Hart, B. R.
Ratto, T. V.
TI Detection and discrimination of pure gases and binary mixtures using a
dual-modality microcantilever sensor
SO SENSORS AND ACTUATORS A-PHYSICAL
LA English
DT Article
DE Gas detection; Cantilever sensor; Thermal conductivity; Resonant damping
ID THERMAL-CONDUCTIVITY SENSOR; CANTILEVER; HYDROGEN; SILICON; VAPOR;
ARRAY; SENSITIVITY; TECHNOLOGY; GEOMETRY; SYSTEM
AB A new method for detecting and discriminating pure gases and binary mixtures has been investigated. This approach is based on two distinct physical mechanisms which can be simultaneously employed within a single microcantilever: heat dissipation and resonant damping in the viscous regime. An experimental study of the heat dissipation mechanism indicates that the sensor response is directly correlated to the thermal conductivity of the gaseous analyte. A theoretical data set of resonant damping was generated corresponding to the gas mixtures examined in the thermal response experiments. The combination of the thermal and resonant response data yields more distinct analyte signatures that cannot otherwise be obtained from the detection modes individually. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Loui, A.; Sirbuly, D. J.; Elhadj, S.; McCall, S. K.; Hart, B. R.; Ratto, T. V.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Loui, A (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA.
EM loui2@llnl.gov; dsirbuly@ucsd.edu
RI McCall, Scott/G-1733-2014
OI McCall, Scott/0000-0002-7979-4944
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]
FX This work was performed under the auspices of the U.S. Department of
Energy by Lawrence Livermore National Laboratory under Contract
DE-AC52-07NA27344. The authors would like to thank J.T. Chang, J.M.
Zumstein, and J.L. Herberg for their contributions to this work.
NR 34
TC 12
Z9 12
U1 0
U2 12
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0924-4247
J9 SENSOR ACTUAT A-PHYS
JI Sens. Actuator A-Phys.
PD APR
PY 2010
VL 159
IS 1
BP 58
EP 63
DI 10.1016/j.sna.2010.03.004
PG 6
WC Engineering, Electrical & Electronic; Instruments & Instrumentation
SC Engineering; Instruments & Instrumentation
GA 596CP
UT WOS:000277661800008
ER
PT J
AU Al-Karaghouli, A
Kazmerski, LL
AF Al-Karaghouli, Ali
Kazmerski, L. L.
TI Optimization and life-cycle cost of health clinic PV system for a rural
area in southern Iraq using HOMER software
SO SOLAR ENERGY
LA English
DT Article
DE Photovoltaics (PV); Stand-alone system; Rural electrification; Rural
area in Iraq; System; Design
AB This paper addresses the need for electricity of rural areas in southern Iraq and proposes a photovoltaic (PV) solar system to power a health clinic in that region. The total daily health clinic load is 31.6 kWh and detailed loads are listed. The National Renewable Energy Laboratory (NREL) optimization computer model for distributed power, "HOMER," is used to estimate the system size and its life-cycle cost. The analysis shows that the optimal system's initial cost, net present cost, and electricity cost is US$ 50,700, US$ 60,375, and US$ 0.238/kW h, respectively. These values for the PV system are compared with those of a generator alone used to supply the load. We found that the initial cost, net present cost of the generator system, and electricity cost are US$ 4500, US$ 352,303, and US$ 1.332/kW h, respectively. We conclude that using the PV system is justified on humanitarian, technical, and economic grounds. (C) 2010 Published by Elsevier Ltd.
C1 [Al-Karaghouli, Ali; Kazmerski, L. L.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Kazmerski, LL (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA.
EM kaz@nrel.gov
FU U.S. Department of Energy [DE-AC36-08-G028308]
FX This work was funded by the U.S. Department of Energy under Contract No.
DE-AC36-08-G028308.
NR 3
TC 47
Z9 48
U1 0
U2 14
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0038-092X
J9 SOL ENERGY
JI Sol. Energy
PD APR
PY 2010
VL 84
IS 4
SI SI
BP 710
EP 714
DI 10.1016/j.solener.2010.01.024
PG 5
WC Energy & Fuels
SC Energy & Fuels
GA 582IK
UT WOS:000276590200019
ER
PT J
AU Schriver, M
Regan, W
Loster, M
Zettl, A
AF Schriver, M.
Regan, W.
Loster, M.
Zettl, A.
TI Carbon nanostructure-aSi:H photovoltaic cells with high open-circuit
voltage fabricated without dopants
SO SOLID STATE COMMUNICATIONS
LA English
DT Article
DE Nanostructures; Semiconductors; Photoconductivity and photovoltaics
ID SOLAR-CELLS; GRAPHENE; FILMS
AB Recently discovered production techniques allow the synthesis of carbon nanostructured films with large surface areas. The abundance of carbon and the unique properties of these nanostructures, including high transparency and excellent electrical conductivity, make these materials very interesting for photovoltaic applications, in particular in combination with amorphous silicon. We examine the properties of thin carbon nanotube films (buckypaper) and graphene in junctions with undoped amorphous silicon thin films. The observed open-circuit voltages, 390 mV for the carbon nanotube film and 150 mV for graphene, suggest that solar cells with high efficiency can be produced without expensive processing steps like doping, multilayer film deposition in high vacuum, or transparent conducting oxide deposition. The buckypaper cells are stable in ambient conditions for many weeks, at least. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Schriver, M.; Regan, W.; Loster, M.; Zettl, A.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Schriver, M.] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA.
[Schriver, M.; Regan, W.; Loster, M.; Zettl, A.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
[Regan, W.; Zettl, A.] Univ Calif Berkeley, Ctr Integrated Nanomech Syst, Berkeley, CA 94720 USA.
RP Zettl, A (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM azettl@berkeley.edu
RI Zettl, Alex/O-4925-2016;
OI Zettl, Alex/0000-0001-6330-136X; Regan, William/0000-0003-0143-9827
FU Office of Energy Research; Materials Sciences and Engineering Division;
US Department of Energy [DE-AC02-05CH11231]; National Science Foundation
[EEC-0425914]; National Defense Science and Engineering
FX This work was supported in part by the Director, Office of Energy
Research, Materials Sciences and Engineering Division, of the US
Department of Energy under contract No. DE-AC02-05CH11231 through the
sp2-bonded Materials Program, which provided for growth of the graphene
films and development of the transfer method, by the National Science
Foundation through the Center of Integrated Nanomechanical Systems under
Grant No. EEC-0425914, which provided for aSi deposition, and by the
Office of Naval Research, which provided for photovoltaic cell design
and characterization. M.S. acknowledges support through a National
Defense Science and Engineering Graduate Fellowship, and W.R.
acknowledges support through a National Science Foundation Graduate
Research Fellowship.
NR 14
TC 13
Z9 13
U1 0
U2 17
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0038-1098
J9 SOLID STATE COMMUN
JI Solid State Commun.
PD APR
PY 2010
VL 150
IS 13-14
BP 561
EP 563
DI 10.1016/j.ssc.2010.01.013
PG 3
WC Physics, Condensed Matter
SC Physics
GA 581FZ
UT WOS:000276508300003
ER
PT J
AU Armstead, W
Ganguly, K
Riley, J
Kiessling, W
Cines, D
Higazi, A
Muzykantov, V
AF Armstead, William
Ganguly, Kumkum
Riley, John
Kiessling, Willis
Cines, Douglas
Higazi, Abd
Muzykantov, Vladimir
TI RBC Coupled tPA Prevents Impairment of Hypercapnic and Hypotensive
Cerebrovasodilation After Piglet Photothrombosis Through Inhibition of
JNK and Potentiation of p38 MAPK
SO STROKE
LA English
DT Meeting Abstract
CT International Stroke Conference
CY FEB 23-26, 2010
CL San Antonio, TX
SP Amer Heart Assoc, Amer Stroke Assoc
C1 [Armstead, William; Riley, John; Kiessling, Willis; Cines, Douglas; Higazi, Abd; Muzykantov, Vladimir] Univ Penn, Philadelphia, PA 19104 USA.
[Ganguly, Kumkum] Los Alamos Natl Lab, Los Alamos, NM USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0039-2499
J9 STROKE
JI Stroke
PD APR
PY 2010
VL 41
IS 4
BP E251
EP E251
PG 1
WC Clinical Neurology; Peripheral Vascular Disease
SC Neurosciences & Neurology; Cardiovascular System & Cardiology
GA 575XU
UT WOS:000276106100246
ER
PT J
AU Markiewicz, WD
Swenson, CA
AF Markiewicz, W. D.
Swenson, C. A.
TI Winding strain analysis for YBCO coated conductors
SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY
LA English
DT Article
ID FIELD SUPERCONDUCTING SOLENOIDS
AB An analysis is made of the winding strains for YBCO coated conductors in solenoid coils. Expressions are developed for the bend strains that occur in pancake and layer wound coils as a function of the relevant parameters. The bend strain for the winding of radial pancakes or helical layers follows directly from the bending analysis of thin beams. In the case that there is a radial step in the windings, as might occur at a joint, a simple model for the step is introduced and an expression for the associated bend strain is derived. For layer winding, two patterns of layer end turn are suggested to meet the design objectives and to avoid radial build interference. Expressions for the wide direction bend strain are derived. The reported strain tolerance of the critical current of YBCO is reviewed to quantify acceptable limits for the bend strain. Bend strains are computed for various configurations of pancake winding and layer winding using the derived expressions and compared to the measured irreversible strain. At large winding diameters, bend strains are generally low but are shown to increase and become a design constraint at small diameters. Locations for joints are identified in the end turn regions of layer winding patterns. Depending on the diameter of the windings and the space available for the end turn, it is shown that the presence of a joint can greatly increase the bend strain of the end turn.
C1 [Markiewicz, W. D.] Natl High Magnet Field Lab, Tallahassee, FL 32310 USA.
[Swenson, C. A.] Los Alamos Natl Lab, Los Alamos, NM 87544 USA.
RP Markiewicz, WD (reprint author), Natl High Magnet Field Lab, Tallahassee, FL 32310 USA.
EM markiewicz@magnet.fsu.edu
FU National Science Foundation [DMR-0654118]; State of Florida
FX This work was supported by the National Science Foundation Grant
DMR-0654118 and the State of Florida.
NR 18
TC 8
Z9 8
U1 0
U2 3
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0953-2048
J9 SUPERCOND SCI TECH
JI Supercond. Sci. Technol.
PD APR
PY 2010
VL 23
IS 4
AR 045017
DI 10.1088/0953-2048/23/4/045017
PG 12
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 571MN
UT WOS:000275756000019
ER
PT J
AU Romanenko, A
Padamsee, H
AF Romanenko, A.
Padamsee, H.
TI The role of near-surface dislocations in the high magnetic field
performance of superconducting niobium cavities
SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY
LA English
DT Article
ID BAKING
AB Quantitative analysis of the near-surface dislocation content performed using electron backscattered diffraction for samples cut from niobium cavities limited by the 'high field Q-slope' effect show a high dislocation content, as well as a pronounced change in the near-surface dislocation content caused by the 100-120 degrees C annealing when such annealing has a healing effect on the high field Q-slope. We propose a model for the sharp degradation of the cavity Q at high field for niobium cavities based on dislocation-assisted magnetic flux entry at surface magnetic fields lower than those expected for ideal niobium. It is proposed that the elimination of the high field Q-slope by 100-120 degrees C annealing is caused by vacancy-assisted dislocation climb in the near-surface region.
C1 [Romanenko, A.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Romanenko, A.; Padamsee, H.] Cornell Univ, CLASSE, Ithaca, NY USA.
RP Romanenko, A (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.
EM aroman@fnal.gov
NR 17
TC 21
Z9 21
U1 0
U2 1
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0953-2048
J9 SUPERCOND SCI TECH
JI Supercond. Sci. Technol.
PD APR
PY 2010
VL 23
IS 4
AR 045008
DI 10.1088/0953-2048/23/4/045008
PG 4
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 571MN
UT WOS:000275756000010
ER
PT J
AU Stan, L
Tao, BW
Holesinger, TG
Yang, H
Feldmann, DM
Maiorov, B
Baily, SA
Civale, L
DePaula, RF
Li, YR
Jia, QX
AF Stan, L.
Tao, B. W.
Holesinger, T. G.
Yang, H.
Feldmann, D. M.
Maiorov, B.
Baily, S. A.
Civale, L.
DePaula, R. F.
Li, Y. R.
Jia, Q. X.
TI The role of thermally and chemically stable composite Y2O3:Al2O3 in the
development of YBa2Cu3O7-x films on metal substrates
SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY
LA English
DT Article
ID YTTRIA-STABILIZED-ZIRCONIA; COATED CONDUCTORS; THIN-FILMS; BUFFER
LAYERS; DEPOSITION; MGO; SUPERCONDUCTORS; TEMPLATES
AB We have developed Y2O3:Al2O3 (YAlO) composites to simplify the architecture of superconducting YBa2Cu3O7-x (YBCO) thick films on polycrystalline metal substrates. By implementing the use of YAlO, we have reduced the total number of non-superconducting layers between the polycrystalline metal substrate and the YBCO film from five (as in the standard architecture used by industry) to three. The YBCO films grown on this simplified platform exhibited an in-plane mosaic spread of less than 4. in full width at half-maximum, correlated pinning centered at H parallel to c, and an a value (the proportionality factor of the critical current density H-alpha) of around 0.38 over the field range of 0.1-1.0 T. We believe that the excellent structural stability at high temperatures and the exceptional chemical inertness in an oxidizing environment make YAlO a good choice for use in the growth of biaxially oriented MgO and subsequent buffer and superconducting layers.
C1 [Stan, L.; Holesinger, T. G.; Yang, H.; Feldmann, D. M.; Maiorov, B.; Baily, S. A.; Civale, L.; DePaula, R. F.; Jia, Q. X.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Tao, B. W.; Li, Y. R.] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China.
RP Stan, L (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM lilianas@lanl.gov; qxjia@lanl.gov
RI Jia, Q. X./C-5194-2008;
OI Maiorov, Boris/0000-0003-1885-0436; Civale, Leonardo/0000-0003-0806-3113
FU US Department of Energy-Office of Electricity Delivery and Energy
Reliability, Superconductivity Program for Electric Power Systems; US
Department of Energy through the Center for Integrated Nanotechnologies
(CINT)
FX This work was sponsored by US Department of Energy-Office of Electricity
Delivery and Energy Reliability, Superconductivity Program for Electric
Power Systems. QXJ thanks the support of the US Department of Energy
through the Center for Integrated Nanotechnologies (CINT) for this work.
NR 13
TC 2
Z9 3
U1 1
U2 17
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-2048
J9 SUPERCOND SCI TECH
JI Supercond. Sci. Technol.
PD APR
PY 2010
VL 23
IS 4
AR 045012
DI 10.1088/0953-2048/23/4/045012
PG 4
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 571MN
UT WOS:000275756000014
ER
PT J
AU Wimbush, SC
Durrell, JH
Tsai, CF
Wang, H
Jia, QX
Blamire, MG
MacManus-Driscoll, JL
AF Wimbush, S. C.
Durrell, J. H.
Tsai, C. F.
Wang, H.
Jia, Q. X.
Blamire, M. G.
MacManus-Driscoll, J. L.
TI Enhanced critical current in YBa2Cu3O7-delta thin films through pinning
by ferromagnetic YFeO3 nanoparticles
SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY
LA English
DT Article
ID SUPERCONDUCTOR; MULTILAYERS; ARRAYS
AB Nanoscale ferromagnetic inclusions of YFeO3 have been incorporated into pulsed laser deposited YBa2Cu3O7-delta (YBCO) thin films. The poisoning of the YBCO through the addition of the magnetic material is minor, with 1 mol% doping resulting in an unsuppressed superconducting transition temperature of 90 K. The critical current density of the magnetically doped films is enhanced both in field and at self-field, and values of 3.0 MA cm(-2) have been achieved at 77 K, self-field in films 1 mu m thick, compared to 1.5 MA cm(-2) in an undoped film prepared by the same process. Such an enhancement in critical current at such low dopant levels is suggestive of an additional contribution to the flux pinning from the magnetic constituent.
C1 [Wimbush, S. C.; Durrell, J. H.; Blamire, M. G.; MacManus-Driscoll, J. L.] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England.
[Tsai, C. F.; Wang, H.] Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA.
[Jia, Q. X.] Los Alamos Natl Lab, MPA STC, Los Alamos, NM 87545 USA.
RP Wimbush, SC (reprint author), Univ Cambridge, Dept Mat Sci & Met, Pembroke St, Cambridge CB2 3QZ, England.
EM scw42@cam.ac.uk
RI Jia, Q. X./C-5194-2008; Wimbush, Stuart/F-3736-2011; Wang,
Haiyan/P-3550-2014; Durrell, John/A-4052-2008
OI Wimbush, Stuart/0000-0003-1636-643X; Wang, Haiyan/0000-0002-7397-1209;
Durrell, John/0000-0003-0712-3102
FU UK Engineering and Physical Sciences Research Council [EP/C517776/1];
The Leverhulme Trust; The Isaac Newton Trust
FX This work was funded by the UK Engineering and Physical Sciences
Research Council (grant no. EP/C517776/1). SCW is supported by The
Leverhulme Trust with supplementary funding from The Isaac Newton Trust.
The authors acknowledge helpful discussions with R B Dinner.
NR 20
TC 22
Z9 22
U1 2
U2 15
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-2048
J9 SUPERCOND SCI TECH
JI Supercond. Sci. Technol.
PD APR
PY 2010
VL 23
IS 4
AR 045019
DI 10.1088/0953-2048/23/4/045019
PG 5
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 571MN
UT WOS:000275756000021
ER
PT J
AU Zhu, Y
Hunte, F
Baily, SA
Balakirev, FF
Zhuang, CG
Feng, QR
Gan, ZZ
Xi, XX
Larbalestier, DC
Voyles, PM
AF Zhu, Y.
Hunte, F.
Baily, S. A.
Balakirev, F. F.
Zhuang, C. G.
Feng, Q. R.
Gan, Z. Z.
Xi, X. X.
Larbalestier, D. C.
Voyles, P. M.
TI MgO platelets and high critical field in MgB2 thin films doped with
carbon from methane (vol 22, 125001, 2009)
SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY
LA English
DT Correction
C1 [Zhu, Y.; Voyles, P. M.] Univ Wisconsin, Dept Mat Sci & Engn, Madison, WI 53706 USA.
[Hunte, F.; Larbalestier, D. C.] Florida State Univ, Natl High Magnet Field Lab, Ctr Appl Superconduct, Tallahassee, FL 32310 USA.
[Baily, S. A.; Balakirev, F. F.] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA.
[Zhuang, C. G.; Feng, Q. R.; Gan, Z. Z.] Peking Univ, Sch Phys, Beijing 100871, Peoples R China.
[Zhuang, C. G.; Feng, Q. R.; Gan, Z. Z.] Peking Univ, State Key Lab Artificial Microstruct & Mesoscop P, Beijing 100871, Peoples R China.
[Xi, X. X.] Penn State Univ, Dept Phys, University Pk, PA 16802 USA.
[Xi, X. X.] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA.
[Xi, X. X.] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA.
RP Zhu, Y (reprint author), Univ Wisconsin, Dept Mat Sci & Engn, 1509 Univ Ave, Madison, WI 53706 USA.
RI Larbalestier, David/B-2277-2008
OI Larbalestier, David/0000-0001-7098-7208
NR 1
TC 0
Z9 0
U1 0
U2 6
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-2048
J9 SUPERCOND SCI TECH
JI Supercond. Sci. Technol.
PD APR
PY 2010
VL 23
IS 4
AR 049801
DI 10.1088/0953-2048/23/4/049801
PG 1
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA 571MN
UT WOS:000275756000036
ER
PT J
AU Duda, JC
Hopkins, PE
Beechem, TE
Smoyer, JL
Norris, PM
AF Duda, John C.
Hopkins, Patrick E.
Beechem, Thomas E.
Smoyer, Justin L.
Norris, Pamela M.
TI Inelastic phonon interactions at solid-graphite interfaces
SO SUPERLATTICES AND MICROSTRUCTURES
LA English
DT Article
DE Inelastic; Graphite; Thermal boundary conductance; Phonon; Transport;
Interface
ID THERMAL-BOUNDARY CONDUCTANCE
AB The presented model predicts thermal boundary conductance at interfaces where one material comprising the junction is characterized by high elastic anisotropy. In contrast to previous approaches, the current methodology accounts for contributions from inelastic scattering through consideration of multiple-phonon interactions. Inelastic contributions become significant as the temperature, as well as the degree of acoustic mismatch between the materials, increases. Inclusion of the inelastic interactions is necessary for a variety of interfacial systems including the metal-graphite boundary examined here. Improvement is shown over existing approaches that address only elastic scattering as both three- and four-phonon interactions significantly augment the transport. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Duda, John C.; Smoyer, Justin L.; Norris, Pamela M.] Univ Virginia, Dept Mech & Aerosp Engn, Charlottesville, VA 22904 USA.
[Hopkins, Patrick E.; Beechem, Thomas E.] Sandia Natl Labs, Engn Sci Ctr, Albuquerque, NM 87185 USA.
RP Duda, JC (reprint author), Univ Virginia, Dept Mech & Aerosp Engn, Charlottesville, VA 22904 USA.
EM duda@virginia.edu; pehopki@sandia.gov; pamela@virginia.edu
RI Duda, John/A-7214-2011
FU Office of Naval Research through a MURI [N00014-07-1-0723]; Air Force
Office of Scientific Research [FA9550-09-1-0245]; National Science
Foundation; LDRD program office through the Sandia National
Laboratories; United States Department of Energy's National Nuclear
Security Administration [DE-AC04-94AL85000]
FX J.C.D., J.L.S., and P.M.N. acknowledge the financial support of the
Office of Naval Research through a MURI grant (Grant No.
N00014-07-1-0723) and the financial support of the Air Force Office of
Scientific Research (Grant No. FA9550-09-1-0245). J.C.D. is greatly
appreciative of financial support from the National Science Foundation
through the Graduate Research Fellowship Program. P.E.H. is grateful for
funding from the LDRD program office through the Sandia National
Laboratories Harry S. Truman Fellowship. Sandia is a multiprogram
laboratory operated by Sandia Corporation, a Lockheed-Martin Company,
for the United States Department of Energy's National Nuclear Security
Administration under Contract DE-AC04-94AL85000.
NR 19
TC 26
Z9 26
U1 0
U2 6
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0749-6036
J9 SUPERLATTICE MICROST
JI Superlattices Microstruct.
PD APR
PY 2010
VL 47
IS 4
BP 550
EP 555
DI 10.1016/j.spmi.2010.01.001
PG 6
WC Physics, Condensed Matter
SC Physics
GA 581FY
UT WOS:000276508200005
ER
PT J
AU Vasin, NM
Shchelkachev, MG
Vinokur, VM
AF Vasin, N. M.
Shchelkachev, M. G.
Vinokur, V. M.
TI A new approach for describing glass transition kinetics
SO THEORETICAL AND MATHEMATICAL PHYSICS
LA English
DT Article
DE glass transition; nonequilibrium transition; Keldysh technique
ID SPIN-GLASSES; DYNAMICS; SUPERSYMMETRY; SYSTEMS
AB We use a functional integral technique generalizing the Keldysh diagram technique to describe glass transition kinetics. We show that the Keldysh functional approach takes the dynamical determinant arising in the glass dynamics into account exactly and generalizes the traditional approach based on using the supersymmetric dynamic generating functional method. In contrast to the supersymmetric method, this approach allows avoiding additional Grassmannian fields and tracking the violation of the fluctuation-dissipation theorem explicitly. We use this method to describe the dynamics of an Edwards-Anderson soft spin-glass-type model near the paramagnet-glass transition. We show that a Vogel-Fulcher-type dynamics arises in the fluctuation region only if the fluctuation-dissipation theorem is violated in the process of dynamical renormalization of the Keldysh action in the replica space.
C1 [Vasin, N. M.] RAS, Ural Branch, Phys Tech Inst, Izhevsk, Russia.
[Vasin, N. M.; Shchelkachev, M. G.; Vinokur, V. M.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Shchelkachev, M. G.] RAS, LD Landau Theoret Phys Inst, Chernogolovka, Moscow Oblast, Russia.
[Shchelkachev, M. G.] Moscow Inst Phys & Technol, Moscow, Russia.
RP Vasin, NM (reprint author), RAS, Ural Branch, Phys Tech Inst, Izhevsk, Russia.
EM dr_vasin@mail.ru
RI Vasin, Mikhail/G-4461-2016;
OI Chtchelkatchev, Nikolay/0000-0002-7242-1483
FU Russian Foundation for Basic Research [07-02-00998, 07-02-00110];
Russian Academy of Sciences
FX The authors thank V. N. Ryzhov and E. E. Tareeva for the attention to
this work and for the stimulating discussions.; This work is supported
by in part the Russian Foundation for Basic Research (Grant Nos.
07-02-00998 and 07-02-00110) and the program "Quantum Physics of
Condensed Media" of the Russian Academy of Sciences.
NR 24
TC 0
Z9 0
U1 0
U2 1
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0040-5779
J9 THEOR MATH PHYS+
JI Theor. Math. Phys.
PD APR
PY 2010
VL 163
IS 1
BP 537
EP 548
DI 10.1007/s11232-010-0042-2
PG 12
WC Physics, Multidisciplinary; Physics, Mathematical
SC Physics
GA 592YV
UT WOS:000277418800012
ER
PT J
AU Sham, TL
Zinkle, SJ
AF Sham, T. -L.
Zinkle, S. J.
TI Creep and fatigue issues for structural materials in demonstration
fusion energy systems
SO TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
LA English
DT Article
DE fusion energy; creep-fatigue interaction; irradiation creep
ID 9CR-1MO MARTENSITIC STEEL; LOW-ACTIVATION MATERIALS; OXIDATION
INTERACTIONS; HOLDING PERIOD; REACTORS; LIFETIME; ELEMENTS; LIMITS
AB The structural materials proposed for use in future fusion energy systems must perform reliably in an environment consisting of intense neutron irradiation, high temperatures, and cyclic stress. Therefore, thermal creep and creep-fatigue (in addition to irradiation creep) are anticipated to be important issues for the engineering design of structural materials for fusion reactors. The key materials systems under consideration for structures of fusion reactors include 8-9%Cr ferritic/martensitic steels, oxide dispersion strengthened ferritic steels, vanadium alloys and SiC fiber-reinforced SiC matrix ceramic composites. The current elevated temperature creep-fatigue design rules based on the American Society of Mechanical Engineers (ASME) code are discussed, along with a brief review of creep-fatigue interaction mechanisms. Refinements to current international design codes to include radiation-induced phenomena such as reduction in uniform elongation have been performed in association with the engineering design of the ITER fusion energy device currently under construction in France. Several other creep-fatigue issues of potential importance for fusion energy applications are discussed.
C1 [Sham, T. -L.; Zinkle, S. J.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Sham, TL (reprint author), Oak Ridge Natl Lab, POB 2008, Oak Ridge, TN 37831 USA.
EM zinklesj@ornl.gov
OI Zinkle, Steven/0000-0003-2890-6915
NR 27
TC 0
Z9 0
U1 2
U2 13
PU SPRINGER INDIA
PI NEW DELHI
PA 7TH FLOOR, VIJAYA BUILDING, 17, BARAKHAMBA ROAD, NEW DELHI, 110 001,
INDIA
SN 0972-2815
EI 0975-1645
J9 T INDIAN I METALS
JI Trans. Indian Inst. Met.
PD APR
PY 2010
VL 63
IS 2-3
BP 331
EP 337
DI 10.1007/s12666-010-0044-7
PG 7
WC Metallurgy & Metallurgical Engineering
SC Metallurgy & Metallurgical Engineering
GA 685GE
UT WOS:000284616400034
ER
PT J
AU Silin, D
Virnovsky, G
AF Silin, Dmitriy
Virnovsky, George
TI A Variational Model of Disjoining Pressure: Liquid Film on a Nonplanar
Surface
SO TRANSPORT IN POROUS MEDIA
LA English
DT Article
DE Interfacial tension; Disjoining pressure; Capillary pressure;
Wettability
ID STABLE DROP SHAPES; SOLID-SURFACES; THIN-FILM;
EQUILIBRIUM-CONFIGURATIONS; OIL-RESERVOIRS; IMBIBITION; MENISCUS;
FORCES; WETTABILITY; CAPILLARY
AB Variational methods have been successfully used in modelling thin liquid films in numerous theoretical studies of wettability. In this article, the variational model of the disjoining pressure is extended to the general case of a two-dimensional solid surface. The Helmholtz free energy functional depends both on the disjoining pressure isotherm and on the shape of the solid surface. The augmented Young-Laplace equation (AYLE) is a nonlinear second-order partial differential equation. A number of solutions describing wetting films on spherical grains have been obtained. In the case of cylindrical films, the phase portrait technique describes the entire variety of mathematically feasible solutions. It turns out that a periodic solution, which would describe wave-like wetting films, does not satisfy Jacobi's condition of the classical calculus of variations. Therefore, such a solution is nonphysical. The roughness of the solid surface significantly affects liquid film stability. AYLE solutions suggest that film rupture is more likely at a location where the pore-wall surface is most exposed into the pore space, and the curvature is positive.
C1 [Silin, Dmitriy] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
[Virnovsky, George] Int Res Inst Stavanger AS, N-4068 Stavanger, Norway.
RP Silin, D (reprint author), Lawrence Berkeley Natl Lab, 1 Cyclotron Rd,MS 90R1116, Berkeley, CA 94720 USA.
EM DSilin@lbl.gov
FU U. S. Department of Energy [DE-AC02-05CH11231]
FX Most part of this study has been performed at International Research
Institute of Stavanger (IRIS), Norway. The Research Council of Norway,
ConocoPhillips and the Ekofisk Coventurers, including TOTAL, ENI,
StatoilHydro and Petoro, have supported this work through the research
centre COREC. The first author greatly appreciates the hospitality of
IRIS during his visit. Part of this work has been done at Lawrence
Berkeley National Laboratory (LBNL) of the U. S. Department of Energy
under Contract No. DE-AC02-05CH11231. Dr. Andrea Cortis of LBNL and Mr.
Olav Inge Frette of IRIS have read the manuscript and provided valuable
remarks and recommendations, which are greatly appreciated. Many thanks
to the anonymous reviewers for their careful reading of the manuscript
and numerous suggestions.
NR 38
TC 6
Z9 6
U1 1
U2 15
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0169-3913
J9 TRANSPORT POROUS MED
JI Transp. Porous Media
PD APR
PY 2010
VL 82
IS 3
BP 485
EP 505
DI 10.1007/s11242-009-9424-z
PG 21
WC Engineering, Chemical
SC Engineering
GA 575OG
UT WOS:000276076200004
ER
PT J
AU Hakami, RM
Ruthel, G
Stahl, AM
Bavari, S
AF Hakami, Ramin Mollaaghababa
Ruthel, Gordon
Stahl, Andrea M.
Bavari, Sina
TI Gaining ground: assays for therapeutics against botulinum neurotoxin
SO TRENDS IN MICROBIOLOGY
LA English
DT Review
ID TOXIN TYPE-A; SMALL-MOLECULE INHIBITORS; SEROTYPE-B; CLOSTRIDIAL
NEUROTOXINS; CONFORMATIONAL-CHANGES; PROTEASE ACTIVITY; LIGHT-CHAIN;
IN-VIVO; SUBSTRATE; IDENTIFICATION
AB Owing in part to recently heightened concern over bio-terrorism, interest in the mechanism of action of botulinum neurotoxin (BoNT) and development of effective therapeutic strategies has dramatically increased. The emergence of BoNT as an effective treatment for a variety of neurological disorders and its growing use in the cosmetic industry have also increased interest in developing effective countermeasures. Although recent attempts to create effective vaccines appear promising, the multitude of clinical and cosmetic uses of BoNT make mass vaccination against the toxin undesirable and impractical, leading to intensified efforts to develop effective therapeutics to combat large-scale intoxications. In this review, we examine the relevant and available in vitro cell-based assays and in vivo assays for drug discovery and development, especially with regard to the potential for medium- to high-throughput automation and its use in identifying physiologically relevant inhibitors.
C1 [Hakami, Ramin Mollaaghababa] Oak Ridge Associated Univ, Fac Res Participat Program, Belcamp, MD USA.
[Hakami, Ramin Mollaaghababa; Ruthel, Gordon; Stahl, Andrea M.; Bavari, Sina] USA, Med Res Inst Infect Dis, Frederick, MD USA.
[Hakami, Ramin Mollaaghababa] Akimeka Technol LLC, Honolulu, HI USA.
RP Hakami, RM (reprint author), Oak Ridge Associated Univ, Fac Res Participat Program, Belcamp, MD USA.
EM ramin.hakami@us.army.mil; sina.bavari@us.army.mil
FU Defense Threat Reduction Agency [3.10084_09_RD_B]
FX We thank Dr James J. Schmidt and Dr Erkan Kiris for their insightful
contributions to the manuscript. The views, opinions and/or findings
presented here are those of the authors and should not be construed as
an official Department of the Army position, policy or decision unless
designated by other documentation. This work was supported by a grant
from the Defense Threat Reduction Agency (3.10084_09_RD_B to S.B.).
NR 67
TC 26
Z9 28
U1 0
U2 7
PU ELSEVIER SCIENCE LONDON
PI LONDON
PA 84 THEOBALDS RD, LONDON WC1X 8RR, ENGLAND
SN 0966-842X
J9 TRENDS MICROBIOL
JI Trends Microbiol.
PD APR
PY 2010
VL 18
IS 4
BP 164
EP 172
DI 10.1016/j.tim.2010.02.001
PG 9
WC Biochemistry & Molecular Biology; Microbiology
SC Biochemistry & Molecular Biology; Microbiology
GA 585DH
UT WOS:000276804000004
PM 20202845
ER
PT J
AU Evans, RD
Doll, GL
Hager, CH
Howe, JY
AF Evans, R. D.
Doll, G. L.
Hager, C. H.
Howe, J. Y.
TI Influence of Steel Type on the Propensity for Tribochemical Wear in
Boundary Lubrication with a Wind Turbine Gear Oil
SO TRIBOLOGY LETTERS
LA English
DT Article
DE Antiwear additives; Extreme pressure additives; Additive interaction;
Additive decomposition; Power generation; Boundary lubrication wear;
Rolling element bearings: general; Ferrous alloys: steel; Tapered roller
bearings; TEM; Wear mechanisms
ID TRANSMISSION ELECTRON-MICROSCOPY; BEARING SURFACES; CONTACTS; OXIDE
AB Tribochemical wear may occur at the interface between a surface and a lubricant as a result of chemical and mechanical interactions in a tribological contact. Understanding the onset of tribochemical wear damage on component surfaces requires the use of high resolution techniques such as transmission electron microscopy (TEM). In this study, two steel types, case carburized AISI 3310 and through-hardened AISI 52100, were wear tested using a ball-on-disk rolling/sliding contact tribometer in fully formulated commercial wind turbine gearbox oil under boundary lubrication conditions with 10% slip. With the exception of steel type, all other test conditions were held constant. Conventional tribofilm analysis in the wear tracks was performed using X-ray photoelectron spectroscopy, and no significant composition differences were detected in the tribofilms for the different steel disk types. However, TEM analysis revealed significant tribochemical wear differences between the two steel types at multiple length scales, from the near-surface material microstructure (depth < 500 nm) to the tribofilm nanostructure. Nanometer-scale interfacial cracking and surface particle detachment was observed for the AISI 52100 case, whereas the tribofilm/substrate interface was abrupt and undamaged for the AISI 3310 case. Differences in tribofilm structure, including the location and orientation of MoS(2) single sheet inclusions, were observed as a function of steel type as well. It is suggested that the tribochemical wear modes observed in these experiments may be origins of macroscopic surface-initiated damage such as micropitting in bearings and gears.
C1 [Evans, R. D.; Doll, G. L.; Hager, C. H.] Timken Technol Ctr, N Canton, OH USA.
[Howe, J. Y.] Oak Ridge Natl Lab, Oak Ridge, TN USA.
RP Evans, RD (reprint author), Timken Technol Ctr, N Canton, OH USA.
EM ryan.evans@timken.com
RI Howe, Jane/G-2890-2011;
OI Evans, Ryan/0000-0003-4549-8247
NR 11
TC 11
Z9 12
U1 1
U2 21
PU SPRINGER/PLENUM PUBLISHERS
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1023-8883
J9 TRIBOL LETT
JI Tribol. Lett.
PD APR
PY 2010
VL 38
IS 1
BP 25
EP 32
DI 10.1007/s11249-009-9565-9
PG 8
WC Engineering, Chemical; Engineering, Mechanical
SC Engineering
GA 567RB
UT WOS:000275463200003
ER
PT J
AU Polychronopoulou, K
Demas, NG
Gibson, PN
Rebholz, C
Polycarpou, AA
AF Polychronopoulou, Kyriaki
Demas, Nicholaos G.
Gibson, Peter N.
Rebholz, Claus
Polycarpou, Andreas A.
TI Effect of Cu Content on the Structure, and Performance of
Substoichiometric Cr-N Coatings
SO TRIBOLOGY LETTERS
LA English
DT Article
DE Coatings; High temperature tribology; Oxides; Hardness; XRD; XPS
ID NANOCOMPOSITE COATINGS; MECHANICAL-PROPERTIES; POLARIZABILITY APPROACH;
CHROMIUM NITRIDE; HARD COATINGS; TRIBOLOGICAL PROPERTIES; ARC
EVAPORATION; THIN-FILMS; SUPERHARD; MICROSTRUCTURE
AB Cu-Cr-N coatings with Cu contents between 3 and 65 at.%, Cu/Cr ratios in the 0.04-4.5 range and 21-27 at.% N, synthesized by twin electron-beam Physical Vapor Deposition at 450 A degrees C, were investigated and compared against substoichiometric Cr-N reference samples. The main objective of this study is to study the influence of Cu on the structure, and the subsequent effects on the mechanical properties, room (22 A degrees C) and high temperature (500 and 840 A degrees C) tribological performance of Cu-Cr-N coatings. Using X-ray photoelectron spectroscopy, glancing angle X-ray diffraction and scanning electron microscopy, in combination with nanoindentation mechanical property measurements and laboratory-controlled ball-on-disc sliding experiments, it is shown that Cu-Cr-N coatings with low Cu content (3 at.%) possess sufficient wear resistance for high-temperature demanding tribological applications. The lubricious effect of oxide formation at high temperatures is also evaluated.
C1 [Polychronopoulou, Kyriaki; Rebholz, Claus] Univ Cyprus, Dept Mech & Mfg Engn, CY-1678 Nicosia, Cyprus.
[Polychronopoulou, Kyriaki; Demas, Nicholaos G.; Polycarpou, Andreas A.] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA.
[Gibson, Peter N.] Commiss European Communities, Joint Res Ctr, Inst Hlth & Consumer Protect, I-21027 Ispra, VA, Italy.
[Demas, Nicholaos G.] Argonne Natl Lab, Argonne, IL 60439 USA.
RP Polychronopoulou, K (reprint author), Univ Cyprus, Dept Mech & Mfg Engn, CY-1678 Nicosia, Cyprus.
EM kyriakip@ucy.ac.cy
FU European Commission; Cyprus Fulbright Commission
FX The authors gratefully acknowledge the Air Conditioning and
Refrigeration Center, an Industry-University Cooperative Research Center
at the University of Illinois at Urbana-Champaign, the Center for
Microanalysis of Materials, University of Illinois at Urbana-Champaign,
which is partially supported by the U. S. Department of Energy under
Grant DEFG02-91-ER45439, and the use of coating deposition equipment at
TECVAC LTD, Cambridge, UK. K. Polychronopoulou and C. Rebholz gratefully
acknowledge financial support from the European Commission (FP6 Marie
Curie Actions Project EXT-0023899-NanoHeaters) and the Cyprus Fulbright
Commission through a 2007 Fellowship for Advanced Research in the USA.
NR 41
TC 6
Z9 6
U1 2
U2 9
PU SPRINGER/PLENUM PUBLISHERS
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1023-8883
EI 1573-2711
J9 TRIBOL LETT
JI Tribol. Lett.
PD APR
PY 2010
VL 38
IS 1
BP 57
EP 68
DI 10.1007/s11249-009-9572-x
PG 12
WC Engineering, Chemical; Engineering, Mechanical
SC Engineering
GA 567RB
UT WOS:000275463200007
ER
PT J
AU Alloyeau, D
Hsieh, WK
Anderson, EH
Hilken, L
Benner, G
Meng, X
Chen, FR
Kisielowski, C
AF Alloyeau, D.
Hsieh, W. K.
Anderson, E. H.
Hilken, L.
Benner, G.
Meng, X.
Chen, F. R.
Kisielowski, C.
TI Imaging of soft and hard materials using a Boersch phase plate in a
transmission electron microscope
SO ULTRAMICROSCOPY
LA English
DT Article
DE Phase contrast microscopy; Electrostatic phase plate; Soft materials
imaging; In-line holography; Wave reconstruction
ID CONTRAST TRANSFER-FUNCTION; COMPLEX OBSERVATION; THIN-FILMS;
RECONSTRUCTION; RESOLUTION; WAVE; OBJECTS; MODEL; LIMIT
AB Using two levels of electron beam lithography, vapor phase deposition techniques, and FIB etching, we have fabricated an electrostatic Boersch phase plate for contrast enhancement of weak phase objects in a transmission electron microscope. The phase plate has suitable dimensions for the imaging of small biological samples without compromising the high-resolution capabilities of the microscope. A micro-structured electrode allows for phase tuning of the unscattered electron beam, which enables the recording of contrast enhanced in-focus images and in-line holograms. We have demonstrated experimentally that our phase plate improves the contrast of carbon nanotubes while maintaining high-resolution imaging performance, which is demonstrated for the case of an AlGaAs heterostructure. The development opens a new way to study interfaces between soft and hard materials. Published by Elsevier B.V.
C1 [Alloyeau, D.; Hsieh, W. K.; Kisielowski, C.] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
[Anderson, E. H.; Hilken, L.] Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Xray Opt, Berkeley, CA 94720 USA.
[Benner, G.] Carl Zeiss NTS GmbH, D-73447 Oberkochen, Germany.
[Chen, F. R.] Natl Tsing Hua Univ, Dept Engn & Syst Sci, Hsinchu, Taiwan.
RP Alloyeau, D (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, 1 Cyclotron Rd,MS 72, Berkeley, CA 94720 USA.
EM alloyeau.damien@gmail.com
FU Electron Microscopy of Soft Matter Program at Lawrence Berkeley National
Laboratory; Office of Science, Office of Basic Energy Sciences,
Materials Sciences and Engineering Division of the U.S. Department of
Energy [DE-AC02-05CH11231]; National Center for Electron Microscopy
FX We thank Douglas Detert for his kind assistance in writing this
manuscript. This work was supported by the Electron Microscopy of Soft
Matter Program at Lawrence Berkeley National Laboratory and supported by
the Director, Office of Science, Office of Basic Energy Sciences,
Materials Sciences and Engineering Division of the U.S. Department of
Energy under Contract no. DE-AC02-05CH11231. The authors acknowledge
support from the National Center for Electron Microscopy, Lawrence
Berkeley National Laboratory, which is supported by the U.S. Department
of Energy, under Contract no. DE-AC02-05CH11231.
NR 38
TC 23
Z9 23
U1 2
U2 12
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0304-3991
J9 ULTRAMICROSCOPY
JI Ultramicroscopy
PD APR
PY 2010
VL 110
IS 5
BP 563
EP 570
DI 10.1016/j.ultramic.2009.11.016
PG 8
WC Microscopy
SC Microscopy
GA 614NH
UT WOS:000279065700024
ER
PT J
AU Yuan, JS
Abercrombie, LLG
Cao, YW
Halfhill, MD
Zhou, X
Peng, YH
Hu, J
Rao, MR
Heck, GR
Larosa, TJ
Sammons, RD
Wang, XW
Ranjan, P
Johnson, DH
Wadl, PA
Scheffler, BE
Rinehart, TA
Trigiano, RN
Stewart, CN
AF Yuan, Joshua S.
Abercrombie, Laura L. G.
Cao, Yongwei
Halfhill, Matthew D.
Zhou, Xin
Peng, Yanhui
Hu, Jun
Rao, Murali R.
Heck, Gregory R.
Larosa, Thomas J.
Sammons, R. Douglas
Wang, Xinwang
Ranjan, Priya
Johnson, Denita H.
Wadl, Phillip A.
Scheffler, Brian E.
Rinehart, Timothy A.
Trigiano, Robert N.
Stewart, C. Neal, Jr.
TI Functional Genomics Analysis of Horseweed (Conyza canadensis) with
Special Reference to the Evolution of Non-Target-Site Glyphosate
Resistance
SO WEED SCIENCE
LA English
DT Article
DE Bioinformatics; herbicide resistance; phylogeography; systems biology;
transcriptomics
ID VELVETLEAF ABUTILON-THEOPHRASTI; HERBICIDE RESISTANCE; ABC TRANSPORTERS;
LOLIUM-RIGIDUM; WEED GENOMICS; L. CRONQ.; CROPS; TRANSLOCATION;
ARABIDOPSIS; RETENTION
AB The evolution of glyphosate resistance in weedy species places an environmentally benign herbicide in peril. The first report of a dicot plant with evolved glyphosate resistance was horseweed, which occurred in 2001. Since then, several species have evolved glyphosate resistance and genomic information about nontarget resistance mechanisms in any of them ranges from none to little. Here, we report a study combining iGentifier transcriptome analysis, cDNA sequencing, and a heterologous microarray analysis to explore potential molecular and transcriptomic mechanisms of nontarget glyphosate resistance of horseweed. The results indicate that similar molecular mechanisms might exist for nontarget herbicide resistance across multiple resistant plants from different locations, even though resistance among these resistant plants likely evolved independently and available evidence suggests resistance has evolved at least four separate times. In addition, both the microarray and sequence analyses identified non target-site resistance candidate genes for follow-on functional genomics analysis.
C1 [Abercrombie, Laura L. G.; Halfhill, Matthew D.; Peng, Yanhui; Hu, Jun; Rao, Murali R.; Ranjan, Priya; Stewart, C. Neal, Jr.] Univ Tennessee, Dept Plant Sci, Knoxville, TN 37996 USA.
[Yuan, Joshua S.; Zhou, Xin; Hu, Jun] Texas A&M Univ, Dept Plant Pathol & Microbiol, Inst Plant Genom & Microbiol, College Stn, TX 77843 USA.
[Halfhill, Matthew D.] St Ambrose Univ, Dept Biol, Davenport, IA 52803 USA.
[Cao, Yongwei; Heck, Gregory R.; Larosa, Thomas J.; Sammons, R. Douglas] Monsanto Co, St Louis, MO 63167 USA.
[Wang, Xinwang; Johnson, Denita H.; Wadl, Phillip A.; Trigiano, Robert N.] Univ Tennessee, Dept Entomol & Plant Pathol, Knoxville, TN 37996 USA.
[Ranjan, Priya] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA.
[Scheffler, Brian E.] USDA ARS, Gemon & Bioinformat Res Unit, Mid S Area, Genom Lab, Stoneville, MS 38776 USA.
[Rinehart, Timothy A.] USDA ARS, So Hort Lab, Poplarville, MS 39470 USA.
RP Stewart, CN (reprint author), Univ Tennessee, Dept Plant Sci, Knoxville, TN 37996 USA.
EM nealstewart@utk.edu
RI Peng, Yanhui/B-6542-2013;
OI Scheffler, Brian/0000-0003-1968-8952
FU U.S. Department of Agriculture [58-6404-2-0057]; Monsanto Company;
Tennessee Agricultural Experiment Station; Hatch Grants
FX This work was supported by U.S. Department of Agriculture agreement
58-6404-2-0057, a grant from Monsanto Company, and funds from the
Tennessee Agricultural Experiment Station and Hatch Grants. Thanks to
many cooperating laboratories across the United States and Canada for
collecting and donating horseweed seeds and to people in the
laboratories of Tom Mueller, John McElroy, and Greg Armel for help with
glyphosate treatments and useful conversations about weed biology.
NR 69
TC 24
Z9 25
U1 7
U2 59
PU WEED SCI SOC AMER
PI LAWRENCE
PA 810 EAST 10TH ST, LAWRENCE, KS 66044-8897 USA
SN 0043-1745
J9 WEED SCI
JI Weed Sci.
PD APR-JUN
PY 2010
VL 58
IS 2
BP 109
EP 117
DI 10.1614/WS-D-09-00037.1
PG 9
WC Agronomy; Plant Sciences
SC Agriculture; Plant Sciences
GA 588HK
UT WOS:000277059500004
ER
PT J
AU Norris, JT
Robino, CV
Perricone, MJ
Hirschfeld, DA
AF Norris, J. T.
Robino, C. V.
Perricone, M. J.
Hirschfeld, D. A.
TI Development of a Time-Resolved Energy Absorption Measurement Technique
for Laser Beam Spot Welds
SO WELDING JOURNAL
LA English
DT Article
DE Laser Beam Welding; Stainless Steels; Process Control/Monitoring;
Process Optimization; Keyhole Mode Welds
ID KEYHOLE; IRRADIATION; DEPOSITION; BEHAVIOR
AB A method has been developed to temporally characterize the power and energy absorbed in laser beam spot welding (LBSW). As a spot weld is created, the absorption of laser power changes as the surface of the weld pool changes from initial melting through the development of the keyhole. By relating the instantaneous delivered power and pulse energy to the scattered power during welding, a time-resolved description of the power and energy absorption can be obtained. The method uses two gold-plated integrating spheres containing Nd:YAG notch-filtered photodiodes to capture and detect the scattered laser light. Under various welding parameters (pulse energy, duration, and shape), the level of scattered light changes with the condition of the weld pool. For high depth-to-width aspect ratio keyhole mode welds, power transfer efficiency (or instantaneous energy transfer) ranges from 40 to 80% depending on the state of the weld pool. In contrast, low aspect ratio conduction mode welds maintain less than 50% transfer efficiency throughout the welding process. Overall energy transfer efficiencies measured by this method show good agreement with calorimetric (Refs. 1, 2) and thermal expansion measurements (Ref. 4). Time-resolved energy absorption was also evaluated for square and constant ramp down (CRD) pulse shapes. Through characterization of keyhole formation and transfer efficiency in relation to welding parameters, the laser welding process can be optimized, and insight into keyhole phenomena necessary for developing and improving modeling capabilities can be obtained.
C1 [Norris, J. T.; Robino, C. V.; Perricone, M. J.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Hirschfeld, D. A.] New Mexico Inst Min & Technol, Socorro, NM 87801 USA.
RP Norris, JT (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM jjnorris@q.com
FU United States Department of Energy [DE-AC04-94AL85000]
FX The authors would like to thank A. Kilgo for her careful preparation of
the metallographic samples, and Don Susan and Danny MacCallum for their
thorough review of this manuscript. This work was performed at Sandia
National Laboratories, which is a multiprogram laboratory operated by
Sandia Corp., a Lockheed Martin Co., for the United States Department of
Energy under contract DE-AC04-94AL85000.
NR 18
TC 5
Z9 5
U1 2
U2 3
PU AMER WELDING SOC
PI MIAMI
PA 550 N W LEJEUNE RD, MIAMI, FL 33126 USA
SN 0043-2296
J9 WELD J
JI Weld. J.
PD APR
PY 2010
VL 89
IS 4
BP 75S
EP 81S
PG 7
WC Metallurgy & Metallurgical Engineering
SC Metallurgy & Metallurgical Engineering
GA 578JP
UT WOS:000276289900014
ER
PT J
AU Grabowsky, S
Weber, M
Chen, YS
Lentz, D
Schmidt, BM
Hesse, M
Luger, P
AF Grabowsky, Simon
Weber, Manuela
Chen, Yu-Sheng
Lentz, Dieter
Schmidt, Bernd M.
Hesse, Malte
Luger, Peter
TI Electron Density of Corannulene from Synchrotron Data at 12 K,
Comparison with Fullerenes
SO ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES
LA English
DT Article
DE Electron Density; Topological Analysis; Synchrotron Radiation;
Corannulene
ID GEODESIC POLYARENES; DIFFRACTION DATA; CHARGE-DENSITY; CRYSTAL;
COORDINATION; MODEL
AB The electron density of corannulene, C(20)H(10), was derived from a high-resolution synchrotron data set (sin theta/lambda = 1.11 angstrom(-1)) measured at 12 K and from an ab-initio geometry optimization on the B3LYP/6-31G* level. A full topological analysis yielded atomic and bond-topological properties which were compared between experimental and theoretical findings and, as far as steric congruences exist, with corresponding fragments of the fullerene C(70). For the four different types of C-C bonds in corannulene, a rather close bond-order range between 1.3 and 1.8 was found indicating a considerable delocalization in this molecule. As was already found earlier in fullerene cages, the deformation density on the C-C bonds is not arranged symmetrically. There is more density located outside than inside the corannulene bowl so that in total, charge accumulation is shifted to the outer surface of the molecule. The electrostatic potential suggests an H center dot center dot center dot pi stacking in the crystal which directs the relative orientation of the two crystallographically independent corannulene molecules. The positively charged rim region of one molecule is oriented almost perpendicular to the negative potential region at the bottom of a second molecule.
C1 [Grabowsky, Simon; Weber, Manuela; Lentz, Dieter; Schmidt, Bernd M.; Hesse, Malte; Luger, Peter] Free Univ Berlin, Inst Chem & Biochem Anorgan Chem, D-14195 Berlin, Germany.
[Chen, Yu-Sheng] Univ Chicago, Ctr Adv Radiat Sources, Adv Photon Source, ChemMatCARS,ANL, Argonne, IL 60439 USA.
RP Luger, P (reprint author), Free Univ Berlin, Inst Chem & Biochem Anorgan Chem, Fabeckstr 36A & Fabeckstr 34-36, D-14195 Berlin, Germany.
EM luger@chemie.fu-berlin.de
RI Grabowsky, Simon/H-6014-2012
FU Deutsche Forschungsgemeinschaft (DFG) [Lu 222/30-2, Le 423/13-2, SPP
1178]; National Science Foundation/Department of Energy
[NSF/CHE-0822838]; U.S. Department of Energy, Office of Science, Office
of Basic Energy Science [DE-AC02-06CH11357]
FX The authors are grateful to the Deutsche Forschungsgemeinschaft (DFG)
for financial support by projects Lu 222/30-2 and Le 423/13-2 within the
SPP 1178 special priority program. ChemMatCARS Sector 15 is principally
supported by the National Science Foundation/Department of Energy under
grant number NSF/CHE-0822838. Use of the Advanced Photon Source was
supported by the U.S. Department of Energy, Office of Science, Office of
Basic Energy Science, under Contract No. DE-AC02-06CH11357.
NR 28
TC 10
Z9 10
U1 0
U2 7
PU VERLAG Z NATURFORSCH
PI TUBINGEN
PA POSTFACH 2645, 72016 TUBINGEN, GERMANY
SN 0932-0776
J9 Z NATURFORSCH B
JI Z.Naturforsch.(B)
PD APR
PY 2010
VL 65
IS 4
BP 452
EP 460
PG 9
WC Chemistry, Inorganic & Nuclear; Chemistry, Organic
SC Chemistry
GA 612QP
UT WOS:000278916900003
ER
PT J
AU Guan, H
Schmid, B
Bucholtz, A
Bergstrom, R
AF Guan, Hong
Schmid, Beat
Bucholtz, Anthony
Bergstrom, Robert
TI Sensitivity of shortwave radiative flux density, forcing, and heating
rate to the aerosol vertical profile
SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
LA English
DT Article
ID OPTICAL DEPTH; SAFARI 2000; CLOUD; MODIS; LIDAR; ABSORPTION; AIRCRAFT;
PERFORMANCE; IRRADIANCE; ATMOSPHERE
AB The effect of the aerosol vertical distribution on the solar radiation profiles for idealized and measured profiles of extinction and single-scattering albedo (SSA) during the May 2003 Atmospheric Radiation Measurement Aerosol Intensive Observation Period (AIOP) is investigated using the rapid radiative transfer model shortwave code. Calculated profiles of downwelling and upwelling solar flux density during the AIOP are compared with the measurements from solar broadband radiometers aboard a profiling research aircraft. The profiles of aerosol extinction, SSA, and water vapor obtained from the aircraft that carried the radiometers serve as the model inputs. The uplooking radiometers were mounted on a stabilized platform that kept the radiometers parallel with respect to Earth's horizontal plane. The results indicate that the vertical shape of the aerosol extinction profiles has very little impact on the clear-sky direct radiative forcing at the top of atmosphere and surface but is important for forcing profiles of partially absorbing aerosol. The vertical distributions of absorption profiles drastically influence the forcing and heating rate profiles. Using aircraft data from 19 AIOP profiles over the southern Great Plains, we are able to achieve broadband downwelling solar flux density closure within 0.8% (bias difference) or 1.8% (RMS difference), well within the expected measurement uncertainty of 1%-3%. The poorer agreement in upwelling flux density (bias -3.7%, RMS 10%) is attributed to the use of inaccurate surface albedo data. The accurate, vertically resolved aerosol extinction data play an important role in tightening solar radiative flux density closure. This study also suggests that aircraft solar radiative flux density measurements from a stabilized platform have the potential to determine solar heating rate profiles. These measurement-based heating rate profiles provide useful data for heating rate closure studies and indirect estimates of single-scattering albedo assumed in radiative transfer calculations.
C1 [Guan, Hong; Bergstrom, Robert] Bay Area Environm Res Inst, Sonoma, CA 95476 USA.
[Bucholtz, Anthony] USN, Res Lab, Marine Meteorol Div, Monterey, CA 93943 USA.
[Schmid, Beat] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Guan, H (reprint author), Bay Area Environm Res Inst, 560 3rd St W, Sonoma, CA 95476 USA.
EM hong.guan-1@nasa.gov
FU U.S. Department of Energy, Office of Science, Office of Biological and
Environmental Research, Climate and Environmental Sciences Division;
Greenwood Aviation at Ponca City Airport; DOE ARM
FX The ARM Program is sponsored by the U.S. Department of Energy, Office of
Science, Office of Biological and Environmental Research, Climate and
Environmental Sciences Division. The success of the AIOP was due to the
hard work and dedicated efforts of a large team of scientists and
investigators from national laboratories and universities; CIRPAS Twin
Otter and Cessna pilots, crew, and support personnel; SGP site
personnel; ARM infrastructure support; the weather forecaster; and
support from Greenwood Aviation at Ponca City Airport. We thank ARM for
the support of this IOP. The research efforts presented here were funded
through DOE ARM grants to BAERI and PNNL.
NR 56
TC 15
Z9 16
U1 3
U2 8
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-897X
J9 J GEOPHYS RES-ATMOS
JI J. Geophys. Res.-Atmos.
PD MAR 31
PY 2010
VL 115
AR D06209
DI 10.1029/2009JD012907
PG 12
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 578SK
UT WOS:000276315400002
ER
PT J
AU Vugmeyster, L
Ostrovsky, D
Ford, JJ
Lipton, AS
AF Vugmeyster, Liliya
Ostrovsky, Dmitry
Ford, Joseph J.
Lipton, Andrew S.
TI Freezing of Dynamics of a Methyl Group in a Protein Hydrophobic Core at
Cryogenic Temperatures by Deuteron NMR Spectroscopy
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID SOLID-STATE NMR; SPIN-LATTICE-RELAXATION; GLASS-TRANSITION; VILLIN
HEADPIECE; GROUP ROTATION; HEAT-CAPACITY; MAS NMR; DISTRIBUTIONS;
SUBDOMAIN
AB Methyl groups are thought to dominate the dynamics of proteins after slow collective modes of motion freeze out in a glass-transition process. In this work we investigate methyl group dynamics of a key hydrophobic core leucine residue in chicken villin headpiece subdomain protein at 140-4 K using deuteron NMR longitudinal relaxation measurements. A distinct increase in the apparent activation energy is observed at similar to 95 K, indicating an abrupt freezing of methyl group dynamics. Relaxation times at temperatures below 60 K are dominated by the deuteron tunneling mechanism.
C1 [Vugmeyster, Liliya; Ostrovsky, Dmitry] Univ Alaska, Anchorage, AK 99508 USA.
[Ford, Joseph J.; Lipton, Andrew S.] Pacific NW Natl Lab, Richland, WA 99354 USA.
RP Vugmeyster, L (reprint author), Univ Alaska, Anchorage, AK 99508 USA.
EM aflv@uaa.alaska.edu
FU University of Alaska [104110]; Research Corporation for Science
Advancement
FX We are indebted to Jesse Sears for technical assistance and Prof. Robert
Vold for providing an extended version of the EXPRESS simulation program
and useful discussions. This research was performed using EMSL, a
national user facility located at Pacific Northwest National Laboratory.
L.V. is supported by University of Alaska funds 104110 and an award from
Research Corporation for Science Advancement.
NR 29
TC 18
Z9 18
U1 2
U2 13
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0002-7863
J9 J AM CHEM SOC
JI J. Am. Chem. Soc.
PD MAR 31
PY 2010
VL 132
IS 12
BP 4038
EP +
DI 10.1021/ja909599k
PG 3
WC Chemistry, Multidisciplinary
SC Chemistry
GA 574RE
UT WOS:000276009500004
PM 20201523
ER
PT J
AU Neupane, B
Dang, NC
Acharya, K
Reppert, M
Zazubovich, V
Picorel, R
Seibert, M
Jankowiak, R
AF Neupane, Bhanu
Dang, Nhan C.
Acharya, Khem
Reppert, Mike
Zazubovich, Valter
Picorel, Rafael
Seibert, Michael
Jankowiak, Ryszard
TI Insight into the Electronic Structure of the CP47 Antenna Protein
Complex of Photosystem II: Hole Burning and Fluorescence Study
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID LOW-TEMPERATURE FLUORESCENCE; CORE ANTENNA; ENERGY-TRANSFER; REACTION
CENTERS; GREEN PLANTS; STATES; RESOLUTION; DYNAMICS; KINETICS; TRAP
AB We report low temperature (7) optical spectra of the isolated CP47 antenna complex from Photosystem II (PSII) with a low-T fluorescence emission maximum near 695 nm and not, as previously reported, at 690-693 nm. The latter emission is suggested to result from three distinct bands: a lowest-state emission band near 695 nm (labeled F1) originating from the lowest-energy excitonic state A1 of intact complexes (located near 693 nm and characterized by very weak oscillator strength) as well as emission peaks near 691 nm (FT1) and 685 nm (FT2) originating from subpopulations of partly destabilized complexes. The observation of the F1 emission is in excellent agreement with the 695 nm emission observed in intact PSII cores and thylakoid membranes. We argue that the band near 684 nm previously observed in singlet-minus-triplet spectra originates from a subpopulation of partially destabilized complexes with lowest-energy traps located near 684 nm in absorption (referred to as AT2) giving rise to FT2 emission. It is demonstrated that varying contributions from the F1, FT1, and FT2 emission bands led to different maxima of fluorescence spectra reported in the literature. The fluorescence spectra are consistent with the zero-phonon hole action spectra obtained in absorption mode, the profiles of the nonresonantly burned holes as a function of fluence, as well as the fluorescence line-narrowed spectra obtained for the Q(y) band. The lowest Q(y) state in absorption band (A1) is characterized by an electron-phonon coupling with the Huang-Rhys factor S of similar to 1 and an inhomogeneous width of similar to 180 cm(-1). The mean phonon frequency of the A1 band is 20 cm(-1). In contrast to previous observations, intact isolated CP47 reveals negligible contribution from the triplet-bottleneck hole, i.e., the AT2 trap. It has been shown that Chls in intact CP47 are connected via efficient excitation energy transfer to the A1 trap near 693 nm and that the position of the fluorescence maximum depends on the burn fluence. That is, the 695 nm fluorescence maximum shifts blue with increasing fluence, in agreement with nonresonant hole burned spectra. The above findings provide important constraints and parameters for future excitonic calculations, which in turn should offer new insight into the excitonic structure and composition of low-energy absorption traps.
C1 [Neupane, Bhanu; Dang, Nhan C.; Acharya, Khem; Reppert, Mike; Jankowiak, Ryszard] Kansas State Univ, Dept Chem, Manhattan, KS 66506 USA.
[Zazubovich, Valter] Concordia Univ, Dept Phys, Montreal, PQ H4B 1R6, Canada.
[Picorel, Rafael; Seibert, Michael] Natl Renewable Energy Lab, Golden, CO 80401 USA.
[Picorel, Rafael] CSIC, Estac Expt Aula, Zaragoza 50059, Spain.
RP Jankowiak, R (reprint author), Kansas State Univ, Dept Chem, Manhattan, KS 66506 USA.
EM ryszard@ksu.edu
RI PICOREL, RAFAEL/K-7930-2014
OI PICOREL, RAFAEL/0000-0003-3791-129X
FU U.S. Department of Energy (US-DOE) EPSCoR [DE-FG02-08ER46504,
DE-AC36-08GO28308]; PN I+D+I of Spain [AGL2008-00377]; NSERC
FX This work was performed at K-State and was supported by a U.S.
Department of Energy (US-DOE) EPSCoR grant (R.J.) (DE-FG02-08ER46504)
and the supplements from the Office of Basic Energy Sciences (US-DOE)
and the Kansas Technology Enterprise Corporation. Partial support was
also provided by the Office of Science, US-DOE (M.S.; NREL Contract
DE-AC36-08GO28308), and the PN I+D+I of Spain (R.P.; AGL2008-00377).
V.Z. acknowledges support by NSERC Discovery Grant.
NR 46
TC 23
Z9 23
U1 1
U2 10
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0002-7863
J9 J AM CHEM SOC
JI J. Am. Chem. Soc.
PD MAR 31
PY 2010
VL 132
IS 12
BP 4214
EP 4229
DI 10.1021/ja908510w
PG 16
WC Chemistry, Multidisciplinary
SC Chemistry
GA 574RE
UT WOS:000276009500047
PM 20218564
ER
PT J
AU Cha, W
Song, S
Jeong, NC
Harder, R
Yoon, KB
Robinson, IK
Kim, H
AF Cha, Wonsuk
Song, Sanghoon
Jeong, Nak Cheon
Harder, Ross
Yoon, Kyung Byung
Robinson, Ian K.
Kim, Hyunjung
TI Exploration of crystal strains using coherent x-ray diffraction
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID ZEOLITE; ARRAYS; ZSM-5
AB We measured coherent x-ray diffraction (CXD) on zeolite microcrystals in order to gain information on internal density distribution and to learn more about the strain developed during the synthesis and attachment process on the substrate. From the distortion and asymmetry of the diffraction pattern on the (020) Bragg peak, the strain field distribution is estimated. We inverted the diffraction patterns from a less strained crystal to obtain the three-dimensional image of the shape and internal strain fields using the error reduction and hybrid input-output phase retrieval algorithms. We also show a few examples of characteristic distortion modes relevant to CXD of zeolites.
C1 [Cha, Wonsuk; Kim, Hyunjung] Sogang Univ, Dept Phys, Seoul 121742, South Korea.
[Song, Sanghoon; Yoon, Kyung Byung; Kim, Hyunjung] Sogang Univ, Interdisciplinary Program Integrated Biotechnol, Seoul 121742, South Korea.
[Jeong, Nak Cheon; Yoon, Kyung Byung] Sogang Univ, Dept Chem, Seoul 121742, South Korea.
[Harder, Ross] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[Robinson, Ian K.] UCL, Dept Phys & Astron, London WC1H 0AH, England.
[Robinson, Ian K.] Diamond Light Source, Didcot OX11 0DE, Oxon, England.
RP Kim, H (reprint author), Sogang Univ, Dept Phys, Seoul 121742, South Korea.
EM hkim@sogang.ac.kr
RI Jeong, Nak Cheon/L-4082-2016
OI Jeong, Nak Cheon/0000-0003-3320-5750
FU Ministry of Education, Science and Technology [2009-0053982,
R15-2008-006-01001-0]; Seoul Research and Business Development [10816];
Sogang University Research; ERC FP7 Advanced; US Department of Energy
[DE-AC02-06CH11357]
FX This work was supported by Basic Science Research Program through the
National Research Foundation of Korea (NRF) funded by the Ministry of
Education, Science and Technology (nos 2009-0053982 and
R15-2008-006-01001-0), Seoul Research and Business Development Program
(10816), Sogang University Research Grant (2009) and an ERC FP7 Advanced
Grant. Use of the Advanced Photon Source was supported by the US
Department of Energy, Office of Science, Office of Basic Energy Science,
under contract no. DE-AC02-06CH11357.
NR 15
TC 13
Z9 13
U1 1
U2 14
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 1367-2630
J9 NEW J PHYS
JI New J. Phys.
PD MAR 31
PY 2010
VL 12
AR 035022
DI 10.1088/1367-2630/12/3/035022
PG 10
WC Physics, Multidisciplinary
SC Physics
GA 579EE
UT WOS:000276349600021
ER
PT J
AU Favre-Nicolin, V
Mastropietro, F
Eymery, J
Camacho, D
Niquet, YM
Borg, BM
Messing, ME
Wernersson, LE
Algra, RE
Bakkers, EPAM
Metzger, TH
Harder, R
Robinson, IK
AF Favre-Nicolin, V.
Mastropietro, F.
Eymery, J.
Camacho, D.
Niquet, Y. M.
Borg, B. M.
Messing, M. E.
Wernersson, L-E
Algra, R. E.
Bakkers, E. P. A. M.
Metzger, T. H.
Harder, R.
Robinson, I. K.
TI Analysis of strain and stacking faults in single nanowires using Bragg
coherent diffraction imaging
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID X-RAY-DIFFRACTION; III-V NANOWIRES; TWINNING SUPERLATTICES; PHASE
RETRIEVAL; GROWTH; HETEROSTRUCTURES; ENERGY; ALGORITHM; DIFFUSION;
CRYSTALS
AB Coherent diffraction imaging (CDI) on Bragg reflections is a promising technique for the study of three-dimensional (3D) composition and strain fields in nanostructures, which can be recovered directly from the coherent diffraction data recorded on single objects. In this paper, we report results obtained for single homogeneous and heterogeneous nanowires with a diameter smaller than 100 nm, for which we used CDI to retrieve information about deformation and faults existing in these wires. We also discuss the influence of stacking faults, which can create artefacts during the reconstruction of the nanowire shape and deformation.
C1 [Favre-Nicolin, V.; Mastropietro, F.; Eymery, J.; Camacho, D.; Niquet, Y. M.] CEA, INAC, SP2M, F-38054 Grenoble, France.
[Favre-Nicolin, V.] Univ Grenoble 1, Grenoble, France.
[Mastropietro, F.; Metzger, T. H.] European Synchrotron Radiat Facil, F-38043 Grenoble, France.
[Borg, B. M.; Messing, M. E.; Wernersson, L-E] Lund Univ, Dept Solid State Phys, S-22100 Lund, Sweden.
[Algra, R. E.] Mat Innovat Inst M2i, NL-2628 CD Delft, Netherlands.
[Algra, R. E.; Bakkers, E. P. A. M.] Philips Res Labs, NL-5656 AE Eindhoven, Netherlands.
[Algra, R. E.] Radboud Univ Nijmegen, IMM, NL-6525 AJ Nijmegen, Netherlands.
[Harder, R.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Robinson, I. K.] UCL, London Ctr Nanotechnol, London WC1H 0AH, England.
[Robinson, I. K.] Diamond Light Source, Didcot OX11 0DE, Oxon, England.
RP Favre-Nicolin, V (reprint author), CEA, INAC, SP2M, F-38054 Grenoble, France.
EM Vincent.Favre-Nicolin@cea.fr
RI Messing, Maria/D-5546-2009; Niquet, Yann-Michel/B-9005-2008; Borg,
Mattias/A-8205-2008; Favre-Nicolin, Vincent/A-6685-2017; Eymery,
Joel/A-9839-2009
OI Messing, Maria/0000-0003-1834-236X; Borg, Mattias/0000-0003-1217-369X;
Favre-Nicolin, Vincent/0000-0003-0801-6712; Eymery,
Joel/0000-0002-4216-1166
FU EU [NODE 015783]
FX This work has been partially performed under the EU program NODE 015783.
We thank the ID01 staff (P Boesecke, O Bikondoa, G Carbone and A Diaz)
for their help during the ESRF experiments and both the ESRF and the APS
for providing beamtime for the experiments.
NR 59
TC 36
Z9 36
U1 1
U2 43
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 1367-2630
J9 NEW J PHYS
JI New J. Phys.
PD MAR 31
PY 2010
VL 12
AR 035013
DI 10.1088/1367-2630/12/3/035013
PG 17
WC Physics, Multidisciplinary
SC Physics
GA 579EE
UT WOS:000276349600012
ER
PT J
AU Fluerasu, A
Kwasniewski, P
Caronna, C
Destremaut, F
Salmon, JB
Madsen, A
AF Fluerasu, Andrei
Kwasniewski, Pawel
Caronna, Chiara
Destremaut, Fanny
Salmon, Jean-Baptiste
Madsen, Anders
TI Dynamics and rheology under continuous shear flow studied by x-ray
photon correlation spectroscopy
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID SCATTERING
AB X-ray photon correlation spectroscopy (XPCS) has emerged as a unique technique allowing the measurement of dynamics of materials on mesoscopic lengthscales. One of the most common problems associated with the use of bright x-ray beams is beam-induced radiation damage, and this is likely to become an even more limiting factor at future synchrotron and free-electron laser sources. Flowing the sample during data acquisition is one of the simplest methods allowing the radiation damage to be limited. In addition to distributing the dose over many different scatterers, the method also enables new functionalities such as time-resolved studies. Here, we further develop a recently proposed experimental technique that combines XPCS and continuously flowing samples. More specifically, we use a model colloidal suspension to show how the macroscopic advective response to flow and the microscopic dissipative dynamics (diffusion) can be quantified from the x-ray data. Our results show very good quantitative agreement with a Poisseuille-flow hydrodynamical model combined with Brownian mechanics. The method has many potential applications, e. g. in the study of dynamics of glasses and gels under continuous shear/flow, protein aggregation processes and the interplay between dynamics and rheology in complex fluids.
C1 [Fluerasu, Andrei] Brookhaven Natl Lab, NSLS 2, Upton, NY 11973 USA.
[Kwasniewski, Pawel; Caronna, Chiara; Madsen, Anders] European Synchrotron Radiat Facil, Troika ID10, F-38043 Grenoble, France.
[Destremaut, Fanny; Salmon, Jean-Baptiste] CNRS Rhodia Bordeaux 1, LOF, UMR 5258, F-33608 Pessac, France.
RP Fluerasu, A (reprint author), Brookhaven Natl Lab, NSLS 2, Upton, NY 11973 USA.
EM fluerasu@bnl.gov
RI Salmon, Jean-Baptiste/D-2662-2009
OI Salmon, Jean-Baptiste/0000-0001-9825-5113
NR 15
TC 20
Z9 20
U1 2
U2 26
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 1367-2630
J9 NEW J PHYS
JI New J. Phys.
PD MAR 31
PY 2010
VL 12
AR 035023
DI 10.1088/1367-2630/12/3/035023
PG 10
WC Physics, Multidisciplinary
SC Physics
GA 579EE
UT WOS:000276349600022
ER
PT J
AU Harder, R
Liang, M
Sun, Y
Xia, Y
Robinson, IK
AF Harder, R.
Liang, M.
Sun, Y.
Xia, Y.
Robinson, I. K.
TI Imaging of complex density in silver nanocubes by coherent x-ray
diffraction
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID PHASE RETRIEVAL; STRAIN
AB When using coherent x-rays to perform lensless imaging, it is the complex wave field exiting the sample or, in the case of the Bragg geometry, the deformed electron density distribution of a crystal, that is being sought. For most samples, to some extent, the image will be complex, containing both an amplitude and phase variation across the sample. We have developed versions of the hybrid input-output (HIO) and error reduction (ER) algorithms that are very robust for the inversion to complex objects from three-dimensional (3D) coherent x-ray diffraction (CXD) data measured around a Bragg spot of a small crystal. The development and behavior of these algorithms will be discussed in the context of inverting a 3D CXD pattern measured around a (111) Bragg spot of a silver nanocube.
C1 [Harder, R.] Adv Photon Source, Argonne, IL 60439 USA.
[Liang, M.] DESY, D-22607 Hamburg, Germany.
[Sun, Y.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
[Xia, Y.] Washington Univ, Dept Biomed Engn, St Louis, MO 63130 USA.
[Robinson, I. K.] UCL, London Ctr Nanotechnol, London WC1H 0AH, England.
[Robinson, I. K.] Diamond Light Source, Didcot OX11 0DE, Oxon, England.
RP Harder, R (reprint author), Adv Photon Source, Argonne, IL 60439 USA.
EM rharder@aps.anl.gov
RI Sun, Yugang /A-3683-2010
OI Sun, Yugang /0000-0001-6351-6977
FU US Department of Energy [DE-AC02-06CH11357]; US National Science
Foundation [DMR-9724294]
FX Use of the Advanced Photon Source was supported by the US Department of
Energy, Office of Science, Office of Basic Energy Sciences, under
contract no. DE-AC02-06CH11357. The CXD instrument at Advanced Photon
Source beamline 34ID-C was built with the US National Science Foundation
grant DMR-9724294. Use of the Center for Nanoscale Materials was
supported by the US Department of Energy, Office of Science, Office of
Basic Energy Sciences, under contract no. DE-AC02-06CH11357.
NR 22
TC 24
Z9 24
U1 0
U2 18
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 1367-2630
J9 NEW J PHYS
JI New J. Phys.
PD MAR 31
PY 2010
VL 12
AR 035019
DI 10.1088/1367-2630/12/3/035019
PG 16
WC Physics, Multidisciplinary
SC Physics
GA 579EE
UT WOS:000276349600018
ER
PT J
AU Saldin, DK
Shneerson, VL
Howells, MR
Marchesini, S
Chapman, HN
Bogan, M
Shapiro, D
Kirian, RA
Weierstall, U
Schmidt, KE
Spence, JCH
AF Saldin, D. K.
Shneerson, V. L.
Howells, M. R.
Marchesini, S.
Chapman, H. N.
Bogan, M.
Shapiro, D.
Kirian, R. A.
Weierstall, U.
Schmidt, K. E.
Spence, J. C. H.
TI Structure of a single particle from scattering by many particles
randomly oriented about an axis: toward structure solution without
crystallization?
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID SMALL-ANGLE SCATTERING; RECONSTRUCTION
AB In this paper is demonstrated a complete algorithm for determining the electron density of an individual particle from diffraction patterns of many particles, randomly oriented about a single axis. The algorithm operates on angular correlations among the measured intensity distributions. We also demonstrate the ability to recover the angular correlation functions of a single particle from measured diffraction patterns.
C1 [Saldin, D. K.; Shneerson, V. L.] Univ Wisconsin, Dept Phys, Milwaukee, WI 53211 USA.
[Howells, M. R.; Marchesini, S.; Shapiro, D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Chapman, H. N.] DESY, Ctr Free Elect Laser Sci, D-22607 Hamburg, Germany.
[Chapman, H. N.] Univ Hamburg, D-22607 Hamburg, Germany.
[Bogan, M.] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA.
[Shapiro, D.] Brookhaven Natl Lab, Upton, NY 11973 USA.
[Kirian, R. A.; Weierstall, U.; Schmidt, K. E.; Spence, J. C. H.] Arizona State Univ, Dept Phys, Tempe, AZ 85281 USA.
RP Saldin, DK (reprint author), Univ Wisconsin, Dept Phys, Milwaukee, WI 53211 USA.
EM dksaldin@uwm.edu
RI Kirian, Richard/M-3750-2013; Marchesini, Stefano/A-6795-2009; Chapman,
Henry/G-2153-2010; Weierstall, Uwe/B-3568-2011
OI Bogan, Michael J./0000-0001-9318-3333; Kirian,
Richard/0000-0001-7197-3086; Chapman, Henry/0000-0002-4655-1743;
FU US Department of Energy (DOE) [DE-SC0002141, DE-AC02-76F00515,
DE-AC03-76SF00098]; NSF [MCB-0919195]; NSF Center for Biophotonics
Science and Technology; [DE-FG02-06-ER46277]; [DE-FG03-02ER45996]
FX DKS and JCHS jointly acknowledge support for the present work from the
US Department of Energy (DOE) grant DE-SC0002141, UW, KES and JCHS from
NSF grant MCB-0919195, DKS from DE-FG02-06-ER46277 and the UWM Research
Growth Initiative and JCHS from DE-FG03-02ER45996 and the NSF Center for
Biophotonics Science and Technology. Part of the work was funded by the
DOE at the SLAC National Accelerator Laboratory under contract number
DE-AC02-76F00515. The Lawrence Berkeley National Laboratory and Advanced
Light Source facility are supported by the Director, Office of Energy
Research, Office of Basic Energy Sciences, Materials Sciences Division
of the DOE, under contract no. DE-AC03-76SF00098.
NR 17
TC 33
Z9 34
U1 1
U2 17
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 1367-2630
J9 NEW J PHYS
JI New J. Phys.
PD MAR 31
PY 2010
VL 12
AR 035014
DI 10.1088/1367-2630/12/3/035014
PG 14
WC Physics, Multidisciplinary
SC Physics
GA 579EE
UT WOS:000276349600013
ER
PT J
AU Seu, KA
Su, R
Roy, S
Parks, D
Shipton, E
Fullerton, EE
Kevan, SD
AF Seu, K. A.
Su, R.
Roy, S.
Parks, D.
Shipton, E.
Fullerton, E. E.
Kevan, S. D.
TI Microscopic return point memory in Co/Pd multilayer films
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID RAY; SCATTERING
AB We report soft x-ray speckle metrology measurements of microscopic return point and complementary point memory in Co/Pd magnetic films having perpendicular anisotropy. We observe that the domains assemble into a common labyrinth phase with a period that varies by nearly a factor of two between initial reversal and fields near saturation. Unlike previous studies of similar systems, the ability of the film to reproduce its domain structure after magnetic cycling through saturation varies from loop to loop, from position to position on the sample, and with the part of the speckle pattern used in the metrology measurements. We report the distribution of memory as a function of field and discuss these results in terms of the reversal process.
C1 [Seu, K. A.; Su, R.; Parks, D.; Kevan, S. D.] Univ Oregon, Dept Phys, Eugene, OR 97403 USA.
[Seu, K. A.; Roy, S.] Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA.
[Shipton, E.; Fullerton, E. E.] Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA.
RP Seu, KA (reprint author), Univ Oregon, Dept Phys, Eugene, OR 97403 USA.
EM sroy@lbl.gov
RI Kevan, Stephen/F-6415-2010; Fullerton, Eric/H-8445-2013
OI Kevan, Stephen/0000-0002-4621-9142; Fullerton, Eric/0000-0002-4725-9509
FU National Science Foundation [DMR-0506241]; US Department of Energy
[DE-AC02-05CH11231]
FX This work was supported in part by the National Science Foundation under
grant number DMR-0506241. This work at ALS/LBNL was supported by the
Director, Office of Science, Office of Basic Energy Sciences, of the US
Department of Energy under contract no. DE-AC02-05CH11231.
NR 17
TC 5
Z9 5
U1 1
U2 15
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 1367-2630
J9 NEW J PHYS
JI New J. Phys.
PD MAR 31
PY 2010
VL 12
AR 035009
DI 10.1088/1367-2630/12/3/035009
PG 15
WC Physics, Multidisciplinary
SC Physics
GA 579EE
UT WOS:000276349600008
ER
PT J
AU Jeyakanthan, J
Drevland, RM
Gayathri, DR
Velmurugan, D
Shinkai, A
Kuramitsu, S
Yokoyama, S
Graham, DE
AF Jeyakanthan, Jeyaraman
Drevland, Randy M.
Gayathri, Dasara Raju
Velmurugan, Devadasan
Shinkai, Akeo
Kuramitsu, Seiki
Yokoyama, Shigeyuki
Graham, David E.
TI Substrate Specificity Determinants of the Methanogen Homoaconitase
Enzyme: Structure and Function of the Small Subunit
SO BIOCHEMISTRY
LA English
DT Article
ID BETA-DECARBOXYLATING DEHYDROGENASE; LYSINE BIOSYNTHESIS; HOMOISOCITRATE
DEHYDROGENASE; THERMUS-THERMOPHILUS; CRYSTAL-STRUCTURE; CATALYTIC
PROMISCUITY; PYROCOCCUS-HORIKOSHII; ACONITASE; ISOCITRATE; PATHWAY
AB The aconitase family of hydro-lyase enzymes includes three classes of proteins that catalyze the isomerization of alpha-hydroxy acids to beta-hydroxy acids. Besides aconitase, isopropylmalate isomerase (IPMI) proteins specifically catalyze the isomerization of alpha,beta-dicarboxylates with hydrophobic gamma-chain groups, and homoaconitase (HACN) proteins catalyze the isomerization of tricarboxylates with variable chain length gamma-carboxylate groups. These enzymes' stereospecific hydro-lyase activities make them attractive catalysts to produce diastereomers from unsaturated precursors. However, sequence similarity and convergent evolution among these proteins lead to widespread misannotation and uncertainty about gene function. To Find the substrate specificity determinants of homologous IPMI and HACN proteins from Methanocaldococcus jannaschii, the small-subunit HACN protein (MJ1271) was crystallized for X-ray diffraction. The Structural model showed characteristic residues in a flexible loop region between alpha 2 and alpha 3 that distinguish HACN from IPMI and aconitase proteins. Site-directed mutagenesis of MJ1271 produced loop-region variant proteins that were reconstituted with wild-type MJ1003 large-subunit protein. The heteromers formed promiscuous hydro-lyases with reduced activity but broader substrate specificity. Both R26K and R26V variants formed relatively efficient IPMI enzymes, while the T27A variant had uniformly lower specificity constants for both IPMI and HACN substrates. The R26V T27Y variant resembles the MJ1277 IPMI small subunit in its flexible loop sequence but demonstrated the broad substrate specificity of the R26V variant. These mutations may reverse the evolution of HACN activity from an ancestral IPMI gene, demonstrating the evolutionary potential for promiscuity in hydro-lyase enzymes. Understanding these specificity determinants enables the functional reannotation of paralogous HACN and IPMI genes in numerous genome sequences. These structural and kinetic results will help to engineer new stereospecific hydro-lyase enzymes for chemoenzymatic syntheses.
C1 [Drevland, Randy M.; Graham, David E.] Univ Texas Austin, Dept Chem & Biochem, Austin, TX 78712 USA.
[Jeyakanthan, Jeyaraman] Natl Synchrotron Radiat Res Ctr, Life Sci Grp, Hsinch 30076, Taiwan.
[Gayathri, Dasara Raju; Velmurugan, Devadasan] Univ Madras, Ctr Adv Study Crystallog & Biophys, Madras 600025, Tamil Nadu, India.
[Shinkai, Akeo; Kuramitsu, Seiki] RIKEN SPring 8 Ctr, Harima Inst, Sayo, Hyogo 6795148, Japan.
[Kuramitsu, Seiki] Osaka Univ, Grad Sch Sci, Yokohama, Kanagawa 5600043, Japan.
[Yokoyama, Shigeyuki] RIKEN Syst & Struct Biol Ctr, Yokohama Inst, Yokohama, Kanagawa 2300045, Japan.
[Yokoyama, Shigeyuki] Univ Tokyo, Grad Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan.
Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA.
[Graham, David E.] Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN 37831 USA.
RP Graham, DE (reprint author), Univ Texas Austin, Dept Chem & Biochem, Austin, TX 78712 USA.
EM grahamde@ornl.gov
RI Graham, David/F-8578-2010; Shinkai, Akeo/E-8354-2013
OI Graham, David/0000-0001-8968-7344; Shinkai, Akeo/0000-0002-9867-0832
FU RIKEN Structural Genomic/Proteomics Initiative (RSGI); National Project
on Protein Structural and Functional Analyses; Ministry of Education,
Culture, Sports, Science, and Technology of Japan; National Science
Foundation [MCB-0817903]; U.S. Department of Energy, Office of Science
Biological and Environmental Research; Faraday Fellowship; U.S.
Department of Energy [DE-AC05-00OR22725]
FX The present work was supported by the RIKEN Structural
Genomic/Proteomics Initiative (RSGI), the National Project on Protein
Structural and Functional Analyses, Ministry of Education, Culture,
Sports, Science, and Technology of Japan, National Science Foundation
Grant MCB-0817903. and U.S. Department of Energy, Office of Science
Biological and Environmental Research. R.M.D. Was supported in part by a
Faraday Fellowship. Oak Ridge National Laboratory is managed by
UT-Battelle, LLC for the U.S. Department of Energy under Contract
DE-AC05-00OR22725.
NR 47
TC 7
Z9 10
U1 0
U2 5
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0006-2960
J9 BIOCHEMISTRY-US
JI Biochemistry
PD MAR 30
PY 2010
VL 49
IS 12
BP 2687
EP 2696
DI 10.1021/bi901766z
PG 10
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 572UG
UT WOS:000275858400008
PM 20170198
ER
PT J
AU Xu, TF
Kharaka, YK
Doughty, C
Freifeld, BM
Daley, TM
AF Xu, Tianfu
Kharaka, Yousif K.
Doughty, Christine
Freifeld, Barry M.
Daley, Thomas M.
TI Reactive transport modeling to study changes in water chemistry induced
by CO2 injection at the Frio-I Brine Pilot
SO CHEMICAL GEOLOGY
LA English
DT Article
DE CO2 sequestration; Frio Formation; Water chemistry; Iron release;
Reactive transport modeling
ID CARBON-DIOXIDE; SEDIMENTARY BASINS; ROCK INTERACTIONS; GEOLOGICAL
SEQUESTRATION; THERMODYNAMIC PROPERTIES; GEOCHEMICAL TRANSPORT; AQUIFER
DISPOSAL; GREENHOUSE GASES; SALINE AQUIFERS; SIMULATION
AB To demonstrate the potential for geologic storage of CO2 in saline aquifers, the Frio-I Brine Pilot was conducted, during which 1600 tons of CO2 were injected into a high-permeability sandstone and the resulting subsurface plume of CO2 was monitored using a variety of hydrogeological, geophysical, and geochemical techniques. Fluid samples were obtained before CO2 injection for baseline geochemical characterization, during the CO2 injection to track its breakthrough at a nearby observation well, and after injection to investigate changes in fluid composition and potential leakage into an overlying zone. Following CO2 breakthrough at the observation well, brine samples showed sharp drops in pH, pronounced increases in HCO3- and aqueous Fe, and significant shifts in the isotopic compositions of H2O and dissolved inorganic carbon. Based on a calibrated 1-D radial flow model, reactive transport modeling was performed for the Frio-I Brine Pilot. A simple kinetic model of Fe release from the solid to aqueous phase was developed, which can reproduce the observed increases in aqueous Fe concentration. Brine samples collected after half a year had lower Fe concentrations due to carbonate precipitation, and this trend can be also captured by our modeling. The paper provides a method for estimating potential mobile Fe inventory, and its bounding concentration in the storage formation from limited observation data. Long-term simulations show that the CO2 plume gradually spreads outward due to capillary forces, and the gas saturation gradually decreases due to its dissolution and precipitation of carbonates. The gas phase is predicted to disappear after 500 years. Elevated aqueous CO2 concentrations remain for a longer time, but eventually decrease due to carbonate precipitation. For the Frio-I Brine Pilot, all injected CO2 could ultimately be sequestered as carbonate minerals. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Xu, Tianfu; Doughty, Christine; Freifeld, Barry M.; Daley, Thomas M.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA.
[Kharaka, Yousif K.] US Geol Survey, Menlo Pk, CA 94025 USA.
RP Xu, TF (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
EM tianfu_xu@lbl.gov
RI Freifeld, Barry/F-3173-2010; Daley, Thomas/G-3274-2015; Doughty,
Christine/G-2389-2015
OI Daley, Thomas/0000-0001-9445-0843;
NR 55
TC 91
Z9 93
U1 3
U2 46
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0009-2541
J9 CHEM GEOL
JI Chem. Geol.
PD MAR 30
PY 2010
VL 271
IS 3-4
BP 153
EP 164
DI 10.1016/j.chemgeo.2010.01.006
PG 12
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 582JI
UT WOS:000276592800006
ER
PT J
AU Lee, S
Poet, TS
Smith, JN
Busby-Hjerpe, AL
Timchalk, C
AF Lee, Sookwang
Poet, Torka S.
Smith, Jordan N.
Busby-Hjerpe, Andrea L.
Timchalk, Charles
TI Effect of in vivo nicotine exposure on chlorpyrifos pharmacokinetics and
pharmacodynamics in rats
SO CHEMICO-BIOLOGICAL INTERACTIONS
LA English
DT Article
DE Chlorpyrifos; Organophosphorus pesticide; Metabolism; Nicotine; PBPK;
Cholinesterase
ID HUMAN LIVER-MICROSOMES; CHOLINESTERASE INHIBITION; ORGANOPHOSPHORUS
PESTICIDES; INSECTICIDE CHLORPYRIFOS; BINARY-MIXTURE; METABOLISM;
PARATHION; DIAZINON; OXON; 3,5,6-TRICHLORO-2-PYRIDINOL
AB Routine use of tobacco products may modify physiological and metabolic functions, including drug metabolizing enzymes, which may impact the pharmacokinetics of environmental contaminants. Chlorpyrifos is an organophosphorus (OP) insecticide that is bioactivated to chlorpyrifos-oxon, and manifests its neurotoxicity by inhibiting acetylcholinesterase (AChE). The objective of this study was to evaluate the impact of repeated nicotine exposure on the pharmacokinetics of chlorpyrifos (CPF) and its major metabolite, 3,5,6-trichloro-2-pyridinol (TCPy) in blood and urine and also to determine the impact on cholinesterase (ChE) activity in plasma and brain. Animals were exposed to 7-daily doses of either 1 mg nicotine/kg or saline, and to either a single oral dose of 35 mg CPF/kg or a repeated dose of 5 mg CPF/kg/day for 7 days. Groups of rats were then sacrificed at multiple time-points after receiving the last dose of CPF. Repeated nicotine and CPF exposures resulted in enhanced metabolism of CPF to TCPy, as evidenced by increases in the measured TCPy peak concentration and AUC in blood. However, there was no significant difference in the amount of TCPy (free or total) excreted in the urine within the first 24-h post last dose. The extent of brain acetylcholinesterase (AChE) inhibition was reduced due to nicotine co-exposure consistent with an increase in CYP450-mediated dearylation (detoxification) versus desulfuration. It was of interest to note that the impact of nicotine co-exposure was experimentally observed only after repeated CPF doses. A physiologically based pharmacokinetic model for CPF was used to simulate the effect of increasing the dearylation V(max) based upon previously conducted in vitro metabolism studies. Predicted CPF-oxon concentrations in blood and brain were lower following the expected V(max) increase in nicotine treated groups. These model results were consistent with the experimental data. The current study demonstrated that repeated nicotine exposure could alter CPF metabolism in vivo, resulting in altered brain AChE inhibition. (C) 2010 Elsevier Ireland Ltd. All rights reserved.
C1 [Lee, Sookwang; Poet, Torka S.; Smith, Jordan N.; Busby-Hjerpe, Andrea L.; Timchalk, Charles] Pacific NW Natl Lab, Ctr Biol Monitoring & Modeling, Richland, WA 99352 USA.
RP Timchalk, C (reprint author), Pacific NW Natl Lab, Ctr Biol Monitoring & Modeling, 902 Battelle Blvd, Richland, WA 99352 USA.
EM charles.timchalk@pnl.gov
FU Centers for Disease Control and Prevention (CDC); The National Institute
for Occupational Safety and Health (NIOSH) [R01-OH003629]
FX We thank Dr. J. Campbell for valuable discussions and encouragement. The
contents of this paper have not been subject to any review by Centers
for Disease Control and Prevention, and therefore do not necessarily
reflect the official views of the Agency. Its contents are solely the
responsibility of the authors and no public endorsement should be
inferred. This work was supported by the Centers for Disease Control and
Prevention (CDC) and The National Institute for Occupational Safety and
Health (NIOSH) [CDC/NIOSH grant (R01-OH003629) to Dr. Timchalk].
NR 48
TC 8
Z9 8
U1 2
U2 10
PU ELSEVIER IRELAND LTD
PI CLARE
PA ELSEVIER HOUSE, BROOKVALE PLAZA, EAST PARK SHANNON, CO, CLARE, 00000,
IRELAND
SN 0009-2797
J9 CHEM-BIOL INTERACT
JI Chem.-Biol. Interact.
PD MAR 30
PY 2010
VL 184
IS 3
BP 449
EP 457
DI 10.1016/j.cbi.2010.01.024
PG 9
WC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Toxicology
SC Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Toxicology
GA 586OQ
UT WOS:000276920400017
PM 20097188
ER
PT J
AU Steinbuck, JV
Genin, A
Monismith, SG
Koseff, JR
Holzman, R
Labiosa, RG
AF Steinbuck, Jonah V.
Genin, Amatzia
Monismith, Stephen G.
Koseff, Jeffrey R.
Holzman, Roi
Labiosa, Rochelle G.
TI Turbulent mixing in fine-scale phytoplankton layers: Observations and
inferences of layer dynamics
SO CONTINENTAL SHELF RESEARCH
LA English
DT Article
DE Turbulence; Mixing; Phytoplankton; Fine-scale layers; Thin layers
ID RED-SEA; THIN-LAYERS; MARINE SYNECHOCOCCUS; STRATIFIED FLUID; TIDAL
CYCLE; ELAT AQABA; NORTH-SEA; GULF; SHEAR; COMMUNITY
AB Turbulence measurements in fine-scale phytoplankton layers ( 1 to 10 m) in the Gulf of Aqaba (Red Sea) were used to evaluate mechanisms of layer formation, maintenance, and breakdown. Simultaneous profiles of chlorophyll a (Chl a) fluorescence and temperature microstructure were measured in the upper 40m of a 430m water column over a 16-d period, using a Self Contained Autonomous MicroProfiler (SCAMP). Layers of concentrated phytoplankton were identified in 95 of the 456 profiles. The layers were situated in density stratified regions between 15 and 38 m depth and were characterized by intensities of 0.1 to 0.35 mu g Chl aL(-1) (as much as two times background concentrations) and an average thickness of 10 m. We show that turbulent mixing and isopycnal displacements associated with internal waves modulated the thickness of the layers. Variations in mixing rates within layers were connected to the vertical structure of the stratified turbulence and the stage of layer development. The breakdown of a persistent phytoplankton layer was tied to strong turbulent mixing at the base of the surface mixed layer, which encroached on the layer from above. Hydrographic observations and scaling analysis suggest that the layers most likely formed in horizontal intrusions from the adjacent coastal region. The cross-shore propagation of phytoplankton-rich intrusions may have important implications for the trophic state of offshore planktonic communities. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Steinbuck, Jonah V.; Monismith, Stephen G.; Koseff, Jeffrey R.] Stanford Univ, Environm Fluid Mech Lab, Stanford, CA 94305 USA.
[Genin, Amatzia] Hebrew Univ Jerusalem, Interuniv Inst Marine Sci, H Steinitz Marine Biol Lab, IL-88103 Elat, Israel.
[Holzman, Roi] Univ Calif Davis, Sect Evolut & Ecol, Davis, CA 95616 USA.
[Labiosa, Rochelle G.] Pacific NW Natl Lab, Seattle, WA 98109 USA.
RP Steinbuck, JV (reprint author), Stanford Univ, Environm Fluid Mech Lab, 473 Via Ortega, Stanford, CA 94305 USA.
EM vittorio@stanford.edu
FU US-Israel Binational Science Foundation [2004-264]; NATO Science for
Peace Program [SFP 98220]; NDSEG fellowship; EPA STAR
FX We thank M. Ohevia, M. Stacey, L. Walter, the Israel NMP, and volunteers
from the IUI. We thank the reviewers for insightful comments that
greatly improved the quality of the manuscript. The authors gratefully
acknowledge support from the US-Israel Binational Science Foundation
(2004-264) and the NATO Science for Peace Program (SFP 98220). J.V.S.
acknowledges support from a NDSEG fellowship and EPA STAR fellowship.
NR 55
TC 11
Z9 12
U1 1
U2 15
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0278-4343
EI 1873-6955
J9 CONT SHELF RES
JI Cont. Shelf Res.
PD MAR 30
PY 2010
VL 30
IS 5
BP 442
EP 455
DI 10.1016/j.csr.2009.12.014
PG 14
WC Oceanography
SC Oceanography
GA 581TH
UT WOS:000276547000005
ER
PT J
AU Switzer, EE
Olson, TS
Datye, AK
Atanassov, P
Hibbs, MR
Fujimoto, C
Cornelius, CJ
AF Switzer, Elise E.
Olson, Tim S.
Datye, Abhaya K.
Atanassov, Plamen
Hibbs, Michael R.
Fujimoto, Cy
Cornelius, Christopher J.
TI Novel KOH-free anion-exchange membrane fuel cell: Performance comparison
of alternative anion-exchange ionomers in catalyst ink
SO ELECTROCHIMICA ACTA
LA English
DT Article
DE Alkaline fuel cell; Anion-exchange membrane; Anion-exchange ionomer;
Membrane electrode assembly; KOH free
ID POLYMERIZATION; TEMPERATURE; INTERFACE
AB Alkaline membrane electrode assemblies (ME:As) were fabricated and tested in 5 cm(2) single cell configuration. The fuel cell tests were preformed in the absence of any liquid electrolyte, such as KOH. This study shows fuel cell polarization curves for alkaline membrane fuel cell (AMFC) systems that were fabricated with novel anion-exchange ionomers. A comparison of two novel anion-exchange ionomers incorporated into the catalyst ink was achieved by comparing the performance under H(2)/O(2) and H(2)/air operating conditions. The results presented here indicate that the chemical and physical properties of the recast anion-exchange ionomer that is utilized in AMFC catalyst layers directly influence the obtainable fuel cell performance. It is shown that ionomer materials that are less prone to swelling from hydration and tend to pack closely together in the solid state will result in stronger catalyst-ionomer interfacial interactions. The O(2) transport properties in alkaline MEA cathodes are influenced by the resulting void volume of the electrode as defined by the structure and packing arrangement of the recast ionomer molecules. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Switzer, Elise E.; Olson, Tim S.; Datye, Abhaya K.; Atanassov, Plamen] Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA.
[Hibbs, Michael R.; Fujimoto, Cy] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Cornelius, Christopher J.] Virginia Polytech Inst & State Univ, Dept Chem Engn, Inst Crit Technol & Appl Sci, Blacksburg, VA 24061 USA.
RP Atanassov, P (reprint author), Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA.
EM plamen@unm.edu
RI Atanassov, Plamen/G-4616-2011;
OI Datye, Abhaya/0000-0002-7126-8659
NR 19
TC 44
Z9 44
U1 1
U2 36
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0013-4686
J9 ELECTROCHIM ACTA
JI Electrochim. Acta
PD MAR 30
PY 2010
VL 55
IS 9
BP 3404
EP 3408
DI 10.1016/j.electacta.2009.12.073
PG 5
WC Electrochemistry
SC Electrochemistry
GA 584MY
UT WOS:000276757500051
ER
PT J
AU Larson, MR
Rajashankar, KR
Patel, MH
Robinette, RA
Crowley, PJ
Michalek, S
Brady, LJ
Deivanayagam, C
AF Larson, Matthew R.
Rajashankar, Kanagalaghatta R.
Patel, Manisha H.
Robinette, Rebekah A.
Crowley, Paula J.
Michalek, Suzanne
Brady, L. Jeannine
Deivanayagam, Champion
TI Elongated fibrillar structure of a streptococcal adhesin assembled by
the high-affinity association of alpha- and PPII-helices
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Article
DE bacterial adhesion; dental caries; Streptococcus; x-ray crystallography;
fibrous proteins
ID SURFACE PROTEIN ANTIGEN; MONOCLONAL-ANTIBODIES; SALIVARY AGGLUTININ;
CELL-SURFACE; MUTANS STREPTOCOCCI; ORAL STREPTOCOCCI; BINDING DOMAINS;
II HELIX; I/II; IDENTIFICATION
AB Streptococcus mutans antigen I/II (AgI/II) is a cell surface-localized protein adhesin that interacts with salivary components within the salivary pellicle. AgI/II contributes to virulence and has been studied as an immunological and structural target, but a fundamental understanding of its underlying architecture has been lacking. Here we report a high-resolution (1.8 angstrom) crystal structure of the A(3)VP(1) fragment of S. mutans AgI/II that demonstrates a unique fibrillar form (155 angstrom) through the interaction of two noncontiguous regions in the primary sequence. The A(3) repeat of the alanine-rich domain adopts an extended alpha-helix that intertwines with the P(1) repeat polyproline type II (PPII) helix to form a highly extended stalk-like structure heretofore unseen in prokaryotic or eukaryotic protein structures. Velocity sedimentation studies indicate that full-length AgI/II that contains three A/P repeats extends over 50 nanometers in length. Isothermal titration calorimetry revealed that the high-affinity association between the A3 and P1 helices is enthalpically driven. Two distinct binding sites on AgI/ II to the host receptor salivary agglutinin (SAG) were identified by surface plasmon resonance (SPR). The current crystal structure reveals that AgI/ II family proteins are extended fibrillar structures with the number of alanine-and proline-rich repeats determining their length.
C1 [Patel, Manisha H.; Deivanayagam, Champion] Univ Alabama, Ctr Biophys Sci & Engn, Birmingham, AL 35294 USA.
[Larson, Matthew R.] Univ Alabama, Dept Physiol & Biophys, Birmingham, AL 35294 USA.
[Rajashankar, Kanagalaghatta R.] Argonne Natl Lab, NE Collaborat Access Team, Argonne, IL 60439 USA.
[Robinette, Rebekah A.; Crowley, Paula J.; Brady, L. Jeannine] Univ Florida, Dept Oral Biol, Gainesville, FL 32610 USA.
[Michalek, Suzanne] Univ Alabama, Dept Microbiol, Birmingham, AL 35294 USA.
[Deivanayagam, Champion] Univ Alabama, Dept Vis Sci, Birmingham, AL 35294 USA.
RP Deivanayagam, C (reprint author), Univ Alabama, Ctr Biophys Sci & Engn, Birmingham, AL 35294 USA.
EM champy@cbse.uab.edu
FU National Institutes of Health (NIH)-National Institute of Dental and
Craniofacial Research (NIDCR) [RO1 DE017737, R01 DE013882]; DART [NIDCR
T-32 DE0176707]
FX The authors thank Dr. Irina Protassevitch and Dr. Christie Brouillette
for ITC, CD, and BIAcore studies, and Dr. Peter Prevelige for the
analytical ultracentrifugation studies. M.L. and C.D. thank the
University of Alabama at Birmingham-Comprehensive Cancer Center X-Ray
core and Northeastern Collaborative Access Team facility at Advanced
Photon Source/Argonne National Laboratory. This work was supported by
National Institutes of Health (NIH)-National Institute of Dental and
Craniofacial Research (NIDCR) grants RO1 DE017737 (to C.D.) and R01
DE013882 (to L.J.B.) and by the DART Training Grant NIDCR T-32 DE0176707
(to M.L.).
NR 50
TC 43
Z9 44
U1 1
U2 9
PU NATL ACAD SCIENCES
PI WASHINGTON
PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA
SN 0027-8424
J9 P NATL ACAD SCI USA
JI Proc. Natl. Acad. Sci. U. S. A.
PD MAR 30
PY 2010
VL 107
IS 13
BP 5983
EP 5988
DI 10.1073/pnas.0912293107
PG 6
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 576QA
UT WOS:000276159500053
PM 20231452
ER
PT J
AU Chen, P
Podraza, NJ
Xu, XS
Melville, A
Vlahos, E
Gopalan, V
Ramesh, R
Schlom, DG
Musfeldt, JL
AF Chen, P.
Podraza, N. J.
Xu, X. S.
Melville, A.
Vlahos, E.
Gopalan, V.
Ramesh, R.
Schlom, D. G.
Musfeldt, J. L.
TI Optical properties of quasi-tetragonal BiFeO3 thin films
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE bismuth compounds; charge exchange; dielectric thin films; epitaxial
growth; spectral line shift
ID ROOM-TEMPERATURE; FERROELECTRICITY; POLARIZATION
AB Optical transmission spectroscopy and spectroscopic ellipsometry were used to extract the optical properties of an epitaxially grown quasi-tetragonal BiFeO3 thin film in the near infrared to near ultraviolet range. The absorption spectrum is overall blue shifted compared with that of rhombohedral BiFeO3, with an absorption onset near 2.25 eV, a direct 3.1 eV band gap, and charge transfer excitations that are similar to 0.4 eV higher than those of the rhombohedral counterpart. We interpret these results in terms of structural strain and local symmetry breaking.
C1 [Chen, P.; Xu, X. S.; Musfeldt, J. L.] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA.
[Podraza, N. J.] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
[Melville, A.; Schlom, D. G.] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA.
[Vlahos, E.; Gopalan, V.] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA.
[Ramesh, R.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
[Ramesh, R.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Chen, P (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA.
EM pchen@ion.chem.utk.edu
RI Xu, Xiaoshan/B-1255-2009; Schlom, Darrell/J-2412-2013
OI Xu, Xiaoshan/0000-0002-4363-392X; Schlom, Darrell/0000-0003-2493-6113
FU U.S. DOE [DE-FG02-01ER45885, DE-AC02-05CH1123]; NSF [DMR-0820404,
DMR0908718]; ARO [W911NF-08-2-0032]
FX This work was supported by the U.S. DOE (Grant Nos. DE-FG02-01ER45885 at
UT and DE-AC02-05CH1123 at Berkeley), NSF (Grant Nos. DMR-0820404 and
DMR0908718 at PSU and CU), and ARO (Grant No. W911NF-08-2-0032 at CU).
We thank H. M. Tutuncu for useful discussions.
NR 29
TC 76
Z9 77
U1 7
U2 57
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 29
PY 2010
VL 96
IS 13
AR 131907
DI 10.1063/1.3364133
PG 3
WC Physics, Applied
SC Physics
GA 578EC
UT WOS:000276275300028
ER
PT J
AU Feng, J
Engelhorn, K
Cho, BI
Lee, HJ
Greaves, M
Weber, CP
Falcone, RW
Padmore, HA
Heimann, PA
AF Feng, J.
Engelhorn, K.
Cho, B. I.
Lee, H. J.
Greaves, M.
Weber, C. P.
Falcone, R. W.
Padmore, H. A.
Heimann, P. A.
TI A grazing incidence x-ray streak camera for ultrafast, single-shot
measurements
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE jitter; photocathodes; solenoids; streak cameras; X-ray applications
ID PHOTOCATHODES; RESOLUTION; GOLD
AB An ultrafast x-ray streak camera has been realized using a grazing incidence reflection photocathode. X-rays are incident on a gold photocathode at a grazing angle of 20 degrees and photoemitted electrons are focused by a large aperture magnetic solenoid lens. The streak camera has high quantum efficiency, 600 fs temporal resolution, and 6 mm imaging length in the spectral direction. Its single shot capability eliminates temporal smearing due to sweep jitter, and allows recording of the ultrafast dynamics of samples that undergo nonreversible changes.
C1 [Feng, J.; Engelhorn, K.; Cho, B. I.; Lee, H. J.; Greaves, M.; Weber, C. P.; Falcone, R. W.; Padmore, H. A.; Heimann, P. A.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Feng, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
EM fjun@lbl.gov
RI Cho, Byoung-ick/A-6294-2011
FU U.S. Department of Energy [DE-AC02-05CH11231]
FX This work was supported by the Director, Office of Science, Office of
Basic Energy Sciences, of the U.S. Department of Energy under Contract
No. DE-AC02-05CH11231. The authors would like to thank D. Lowney, Z.
Hao, and A. MacPhee for an early stage of the grazing incidence streak
camera design, W. Wan for COSY calculation, and E. M. Gullikson and F.
Salmassi for coating the photocathode.
NR 17
TC 14
Z9 20
U1 3
U2 13
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 29
PY 2010
VL 96
IS 13
AR 134102
DI 10.1063/1.3371810
PG 3
WC Physics, Applied
SC Physics
GA 578EC
UT WOS:000276275300084
ER
PT J
AU Liu, J
Kareev, M
Prosandeev, S
Gray, B
Ryan, P
Freeland, JW
Chakhalian, J
AF Liu, Jian
Kareev, M.
Prosandeev, S.
Gray, B.
Ryan, P.
Freeland, J. W.
Chakhalian, J.
TI Effect of polar discontinuity on the growth of LaNiO3/LaAlO3
superlattices
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE electronic structure; lanthanum compounds; rough surfaces;
superlattices; surface morphology; valency
ID INTERFACES
AB We have conducted a detailed microscopic investigation of [LaNiO3(1 u.c.)/LaAlO3(1 u.c.)](N) superlattices grown on (001) SrTiO3 and LaAlO3 to explore the influence of polar mismatch on the resulting electronic and structural properties. Our data demonstrate that the initial growth on the nonpolar SrTiO3 surface leads to a rough morphology and unusual 2+ valence of Ni in the initial LaNiO3 layer, which is not observed after growth on the polar surface of LaAlO3. A devised model suggests that the polar mismatch can be resolved if the perovskite layers grow with an excess of LaO, which also accounts for the observed electronic, chemical, and structural effects.
C1 [Liu, Jian; Kareev, M.; Prosandeev, S.; Gray, B.; Chakhalian, J.] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA.
[Ryan, P.; Freeland, J. W.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RP Liu, J (reprint author), Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA.
EM jx1026@uark.edu
RI Liu, Jian/I-6746-2013; Chakhalian, Jak/F-2274-2015
OI Liu, Jian/0000-0001-7962-2547;
FU DOD-ARO [040217291]; NSF [DMR-0747808]; U.S. Department of Energy,
Office of Science [DEAC02-06CH11357]
FX The authors acknowledge fruitful discussions with A. Millis and D.
Khomskii. J.C. was supported by DOD-ARO under the Grant No. 040217291
and NSF Grant No. DMR-0747808. Work at the Advanced Photon Source,
Argonne is supported by the U.S. Department of Energy, Office of Science
under Grant No. DEAC02-06CH11357.
NR 14
TC 22
Z9 22
U1 1
U2 22
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 29
PY 2010
VL 96
IS 13
AR 133111
DI 10.1063/1.3371690
PG 3
WC Physics, Applied
SC Physics
GA 578EC
UT WOS:000276275300057
ER
PT J
AU Roy, T
Puzyrev, YS
Tuttle, BR
Fleetwood, DM
Schrimpf, RD
Brown, DF
Mishra, UK
Pantelides, ST
AF Roy, T.
Puzyrev, Y. S.
Tuttle, B. R.
Fleetwood, D. M.
Schrimpf, R. D.
Brown, D. F.
Mishra, U. K.
Pantelides, S. T.
TI Electrical-stress-induced degradation in AlGaN/GaN high electron
mobility transistors grown under gallium-rich, nitrogen-rich, and
ammonia-rich conditions
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE aluminium compounds; gallium compounds; high electron mobility
transistors; III-V semiconductors; semiconductor device reliability;
wide band gap semiconductors
ID POWER PERFORMANCE; GAN; DEFECTS; HFETS; MBE
AB We have evaluated the long-term electrical reliability of GaN/AlGaN high-electron-mobility transistors grown under Ga-rich, N-rich, and NH(3)-rich conditions. V(pinch-off) shifts positively after stress for devices grown under Ga-rich and N-rich conditions, while it shifts negatively for NH(3)-rich devices. Density functional theory calculations suggest that the hot-electron-induced release of hydrogen from hydrogenated Ga-vacancies is primarily responsible for the degradation of devices grown in Ga-rich and N-rich conditions, while hydrogenated N-antisites are the dominant defects causing degradation in devices grown under NH(3)-rich conditions.
C1 [Roy, T.; Fleetwood, D. M.; Schrimpf, R. D.] Vanderbilt Univ, Dept Elect Engn & Comp Sci, Nashville, TN 37235 USA.
[Puzyrev, Y. S.; Tuttle, B. R.; Fleetwood, D. M.; Pantelides, S. T.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA.
[Tuttle, B. R.] Penn State Univ, Behrend Coll, Dept Phys, Erie, PA 16563 USA.
[Brown, D. F.; Mishra, U. K.] Univ Calif Santa Barbara, Dept Elect Engn, Santa Barbara, CA 93106 USA.
[Pantelides, S. T.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Roy, T (reprint author), Vanderbilt Univ, Dept Elect Engn & Comp Sci, 221 Kirkland Hall, Nashville, TN 37235 USA.
EM tania.roy@vanderbilt.edu
RI Schrimpf, Ronald/L-5549-2013; Roy, Tania/M-6540-2015
OI Schrimpf, Ronald/0000-0001-7419-2701;
NR 12
TC 23
Z9 23
U1 0
U2 17
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 29
PY 2010
VL 96
IS 13
AR 133503
DI 10.1063/1.3377004
PG 3
WC Physics, Applied
SC Physics
GA 578EC
UT WOS:000276275300071
ER
PT J
AU Brake, MR
Wickert, JA
AF Brake, M. R.
Wickert, J. A.
TI Modal analysis of a continuous gyroscopic second-order system with
nonlinear constraints
SO JOURNAL OF SOUND AND VIBRATION
LA English
DT Article
ID UP ELASTIC STOPS; MOTION CONSTRAINTS; LYAPUNOV EXPONENTS; FORCED
OSCILLATOR; IMPACT RESPONSE; TRAVELING BEAM; LINEAR-SYSTEMS; MOVING
WEBS; VIBRATION; DYNAMICS
AB A method for the modal analysis of continuous gyroscopic systems with nonlinear constraints is developed. This method assumes that the nonlinear constraint can be expressed as a piecewise linear force-deflection profile located at an arbitrary position within the domain. Using this assumption, the mode shapes and natural frequencies are first found for each state, then a mapping method based on the inner product of the mode shapes is developed to map the displacement of the system between the in-contact and out-of-contact states. To illustrate this method, a model for the vibration of a traveling string in contact with a piecewise-linear constraint is developed as an analog of the interaction between magnetic tape and a guide in data storage systems. Five design parameters of the guide are considered: flange clearance, flange stiffness, symmetry of the force-deflection profile in terms of flange stiffness and offset, and the guide's position along the length of the string. There are critical bifurcation thresholds, below which the system exhibits no chaotic behavior and is dominated by period one, symmetric behavior, and above which the system contains asymmetric, higher periodic motion with windows of chaotic behavior. These bifurcation thresholds are particularly pronounced for the transport speed, flange clearance, symmetry of the force deflection profile, and guide position. The stability of the system is sensitive to the system's velocity, and, compared to stationary systems, more mode shapes are needed to accurately model the dynamics of the system. Published by Elsevier Ltd.
C1 [Brake, M. R.] Sandia Natl Labs, Appl Mech Dev Dept, Albuquerque, NM 87185 USA.
[Wickert, J. A.] Iowa State Univ, Dept Mech Engn, Ames, IA 50011 USA.
RP Brake, MR (reprint author), Sandia Natl Labs, Appl Mech Dev Dept, POB 5800, Albuquerque, NM 87185 USA.
EM mrbrake@sandia.gov
FU Information Storage Industry Consortium
FX The authors gratefully acknowledge the support from the Information
Storage Industry Consortium. The authors would also like to thank
Carnegie Mellon University's Department of Mechanical Engineering, where
this research was conducted, and Prof. Bill Messner for his feedback on
drafts of this paper.
NR 38
TC 13
Z9 19
U1 1
U2 15
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0022-460X
J9 J SOUND VIB
JI J. Sound Vibr.
PD MAR 29
PY 2010
VL 329
IS 7
BP 893
EP 911
DI 10.1016/j.jsv.2009.10.004
PG 19
WC Acoustics; Engineering, Mechanical; Mechanics
SC Acoustics; Engineering; Mechanics
GA 547UC
UT WOS:000273913900010
ER
PT J
AU Marathe, S
Kim, SS
Kim, SN
Kim, C
Kang, HC
Nickles, PV
Noh, DY
AF Marathe, Shashidhara
Kim, S. S.
Kim, S. N.
Kim, Chan
Kang, H. C.
Nickles, P. V.
Noh, D. Y.
TI Coherent diffraction surface imaging in reflection geometry
SO OPTICS EXPRESS
LA English
DT Article
ID PHASE-RETRIEVAL; FOURIER-TRANSFORM; RECONSTRUCTION; OBJECT; MICROSCOPY;
CONSTRAINT; MODULUS; SUPPORT; PATTERN
AB We present a reflection based coherent diffraction imaging method which can be used to reconstruct a non periodic surface image from a diffraction amplitude measured in reflection geometry. Using a He-Ne laser, we demonstrated that a surface image can be reconstructed solely from the reflected intensity from a surface without relying on any prior knowledge of the sample object or the object support. The reconstructed phase image of the exit wave is particularly interesting since it can be used to obtain quantitative information of the surface depth profile or the phase change during the reflection process. We believe that this work will broaden the application areas of coherent diffraction imaging techniques using light sources with limited penetration depth. (C) 2010 Optical Society of America
C1 [Marathe, Shashidhara; Kim, S. N.; Kim, Chan; Nickles, P. V.; Noh, D. Y.] Gwangju Inst Sci & Technol, Dept Mat Sci & Engn & Nanobio Mat & Elect, Kwangju 500712, South Korea.
[Kim, S. S.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[Kang, H. C.] Chosun Univ, Dept Adv Mat Engn, Kwangju 501759, South Korea.
[Kang, H. C.] BK21 Educ Ctr Mould Technol Adv Mat & Parts, Kwangju 501759, South Korea.
RP Marathe, S (reprint author), Gwangju Inst Sci & Technol, Dept Mat Sci & Engn & Nanobio Mat & Elect, Kwangju 500712, South Korea.
EM dynoh@gist.ac.kr
FU National Core Research Center [R15-2008-006-000000]; National Research
Foundation (NRF) of Korea [R31-2008-000-10026-0]; GIST
FX This work was supported by National Core Research Center grant ( No.
R15-2008-006-000000) and by World Class University program
(R31-2008-000-10026-0) grant provided by National Research Foundation
(NRF) of Korea. We also acknowledge the support from GIST through
'Photonics 2010' project.
NR 24
TC 22
Z9 22
U1 0
U2 6
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD MAR 29
PY 2010
VL 18
IS 7
BP 7253
EP 7262
DI 10.1364/OE.18.007253
PG 10
WC Optics
SC Optics
GA 582MP
UT WOS:000276602000081
PM 20389746
ER
PT J
AU Liu, B
Liu, Y
Braiman, Y
AF Liu, B.
Liu, Y.
Braiman, Y.
TI Coherent beam combining of high power broad-area laser diode array with
a closed-V-shape external Talbot cavity
SO OPTICS EXPRESS
LA English
DT Article
ID SINGLE-LOBED BEAM; BAR; BANDWIDTH; NM; REDUCTION; EMISSION; FEEDBACK; CW
AB We have coherently combined a high-power broad-area laser diode array by using a feedback loop closed off-axis external Talbot cavity. The off-axis feedback from two gratings provides transverse-mode control of broad-area lasers. The Talbot configuration of the external cavity implements diffractive coupling among laser diodes. Feedback from two gratings increases external cavity quality factor and spectrum selection capability. As a result, spatial coherence was improved and spectral linewidth was narrowed down. The high visibility of the far-field profile indicates that high spatial coherence was achieved. We also observed symmetric far-field profiles indicating that laser array was phase locked to in-phase and out-of-phase super-modes, respectively. Transition between these super-modes was observed by tuning one grating's tilted angle. (C) 2010 Optical Society of America
C1 [Liu, B.; Braiman, Y.] Oak Ridge Natl Lab, Div Math & Comp Sci, Ctr Engn Sci Adv Res, Oak Ridge, TN 37831 USA.
[Liu, Y.] Oak Ridge Natl Lab, Res Accelerator Div, Oak Ridge, TN 37831 USA.
[Braiman, Y.] Univ Tennessee, Dept Mech Aerosp & Biomed Engn, Knoxville, TN 37996 USA.
RP Liu, B (reprint author), Oak Ridge Natl Lab, Div Math & Comp Sci, Ctr Engn Sci Adv Res, Oak Ridge, TN 37831 USA.
EM liub@ornl.gov
FU Office of Naval Research; Oak Ridge National Laboratory; U. S.
Department of Energy [DE-AC05-00OR22725]
FX This research was supported by the Office of Naval Research and also in
part by the Laboratory Directed Research and Development Program of Oak
Ridge National Laboratory. Oak Ridge National Laboratory is managed by
UT-Battelle, LLC for the U. S. Department of Energy under Contract
DE-AC05-00OR22725.
NR 27
TC 17
Z9 18
U1 1
U2 23
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD MAR 29
PY 2010
VL 18
IS 7
BP 7361
EP 7368
DI 10.1364/OE.18.007361
PG 8
WC Optics
SC Optics
GA 582MP
UT WOS:000276602000092
PM 20389757
ER
PT J
AU Davoudiasl, H
Gopalakrishna, S
Soni, A
AF Davoudiasl, Hooman
Gopalakrishna, Shrihari
Soni, Amarjit
TI Big signals of Little Randall-Sundrum models
SO PHYSICS LETTERS B
LA English
DT Article
DE Little Randall-Sundrum Models; Large Hadron Collider; Beyond the
Standard Model physics
ID GAUGE BOSONS; HIERARCHY
AB We examine signals at the Large Hadron Collider (LHC) of Kaluza-Klein modes, in volume-truncated "Little Randall-Sundrum" (LRS) models of flavor, characterized by 5D cutoff scales M-5 that are small compared to the 4D Planck mass M-P similar to 10(19) GeV. In particular, for the phenomenologically viable choice M-5 similar to 10(4) TeV, the discovery of a 2 (3)-TeV "Little" Z' at the LHC requires about 1 (4) fb(-1) at root s = 10 (14) TeV, in the clean di-lepton channel. Our results highlight the possibility of probing interesting values of M-5, starting with the early LHC data. With M-5 similar to 10(4) TeV, discovering the second KK mode Z '', at about 4.3 TeV, requires O(100) fb(-1) at root s = 14 TeV, providing a probe of the warped nature of the bulk that is encoded in the mass ratio of the first two KK modes, at design luminosity. By comparison, discovering a 3-TeV Z' of the Planck-weak hierarchy models (with M-5 similar to M-P), in any channel, would require upwards of O(300) fb(-1) at root s = 14 TeV. We also point out that discovery prospects markedly improve for Little KK gluons as well, but the challenging reconstruction of their a decay products may hamper their early discovery. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Davoudiasl, Hooman; Gopalakrishna, Shrihari; Soni, Amarjit] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
RP Davoudiasl, H (reprint author), Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
EM hooman@bnl.gov; shri@quark.phy.bnl.gov; soni@bnl.gov
OI Gopalakrishna, Shrihari/0000-0002-3476-0011
FU US Department of Energy [DE-AC02-98CH10886]
FX We thank Gilad Perez for many discussions especially pertaining to KK
gluons in LRS models. This work was supported by the US Department of
Energy under Grant Contract DE-AC02-98CH10886.
NR 36
TC 8
Z9 8
U1 0
U2 0
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0370-2693
EI 1873-2445
J9 PHYS LETT B
JI Phys. Lett. B
PD MAR 29
PY 2010
VL 686
IS 4-5
BP 239
EP 243
DI 10.1016/j.physletb.2010.02.061
PG 5
WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 581YB
UT WOS:000276560700006
ER
PT J
AU Scott, JJ
Budsberg, KJ
Suen, G
Wixon, DL
Balser, TC
Currie, CR
AF Scott, Jarrod J.
Budsberg, Kevin J.
Suen, Garret
Wixon, Devin L.
Balser, Teri C.
Currie, Cameron R.
TI Microbial Community Structure of Leaf-Cutter Ant Fungus Gardens and
Refuse Dumps
SO PLOS ONE
LA English
DT Article
ID PHOSPHOLIPID FATTY-ACID; ATTA SEXDENS RUBROPILOSA; CUTTING ANTS; GROWING
ANTS; SOIL; BACTERIA; FOREST; NESTS; POPULATION; COLOMBICA
AB Background: Leaf-cutter ants use fresh plant material to grow a mutualistic fungus that serves as the ants' primary food source. Within fungus gardens, various plant compounds are metabolized and transformed into nutrients suitable for ant consumption. This symbiotic association produces a large amount of refuse consisting primarily of partly degraded plant material. A leaf-cutter ant colony is thus divided into two spatially and chemically distinct environments that together represent a plant biomass degradation gradient. Little is known about the microbial community structure in gardens and dumps or variation between lab and field colonies.
Methodology/Principal Findings: Using microbial membrane lipid analysis and a variety of community metrics, we assessed and compared the microbiota of fungus gardens and refuse dumps from both laboratory-maintained and field-collected colonies. We found that gardens contained a diverse and consistent community of microbes, dominated by Gram-negative bacteria, particularly gamma-Proteobacteria and Bacteroidetes. These findings were consistent across lab and field gardens, as well as host ant taxa. In contrast, dumps were enriched for Gram-positive and anaerobic bacteria. Broad-scale clustering analyses revealed that community relatedness between samples reflected system component (gardens/dumps) rather than colony source (lab/field). At finer scales samples clustered according to colony source.
Conclusions/Significance: Here we report the first comparative analysis of the microbiota from leaf-cutter ant colonies. Our work reveals the presence of two distinct communities: one in the fungus garden and the other in the refuse dump. Though we find some effect of colony source on community structure, our data indicate the presence of consistently associated microbes within gardens and dumps. Substrate composition and system component appear to be the most important factor in structuring the microbial communities. These results thus suggest that resident communities are shaped by the plant degradation gradient created by ant behavior, specifically their fungiculture and waste management.
C1 [Scott, Jarrod J.; Budsberg, Kevin J.; Suen, Garret; Balser, Teri C.; Currie, Cameron R.] Univ Wisconsin, US DOE, Great Lakes Bioenergy Res Ctr, Madison, WI 53706 USA.
[Scott, Jarrod J.; Suen, Garret; Currie, Cameron R.] Univ Wisconsin, Dept Bacteriol, Madison, WI 53706 USA.
[Scott, Jarrod J.; Currie, Cameron R.] Smithsonian Trop Res Inst, Balboa, Ancon, Panama.
[Budsberg, Kevin J.; Balser, Teri C.] Univ Wisconsin, Dept Soil Sci, Madison, WI 53706 USA.
[Wixon, Devin L.] Univ Wisconsin, Dept Bot, Madison, WI 53706 USA.
RP Scott, JJ (reprint author), Univ Wisconsin, US DOE, Great Lakes Bioenergy Res Ctr, Madison, WI 53706 USA.
EM currie@bact.wisc.edu
OI Suen, Garret/0000-0002-6170-711X
FU National Science Foundation [DEB-0747002, MCB-0702025, MCB-0731822]; DOE
Great Lakes Bioenergy Research Center [DE-FC02-07ER64494]
FX This work was funded by the National Science Foundation [grants
DEB-0747002 (to CRC), MCB-0702025 (to CRC and TCB), and MCB-0731822 (to
CRC)] and the DOE Great Lakes Bioenergy Research Center (DOE BER Office
of Science DE-FC02-07ER64494, to (CRC)). The funders had no role in
study design, data collection and analysis, decision to publish, or
preparation of the manuscript.
NR 61
TC 26
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U1 2
U2 60
PU PUBLIC LIBRARY SCIENCE
PI SAN FRANCISCO
PA 185 BERRY ST, STE 1300, SAN FRANCISCO, CA 94107 USA
SN 1932-6203
J9 PLOS ONE
JI PLoS One
PD MAR 29
PY 2010
VL 5
IS 3
AR e9922
DI 10.1371/journal.pone.0009922
PG 12
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 576QZ
UT WOS:000276163100015
PM 20360970
ER
PT J
AU Yu, ZQ
Devanathan, R
Jiang, W
Nachimuthu, P
Shutthanandan, V
Saraf, L
Wang, CM
Kuchibhatla, SVNT
Thevuthasan, S
AF Yu, Z. Q.
Devanathan, R.
Jiang, W.
Nachimuthu, P.
Shutthanandan, V.
Saraf, L.
Wang, C. M.
Kuchibhatla, S. V. N. T.
Thevuthasan, S.
TI Integrated experimental and modeling study of ionic conductivity of
scandia-stabilized zirconia thin films
SO SOLID STATE IONICS
LA English
DT Article
DE Sc doping; ZrO(2) thin films; MBE; XRD; TEM; RBS; Ionic conductivity;
Atomistic simulation
ID MOLECULAR-DYNAMICS SIMULATION; PHASE-TRANSITION; DOPED ZIRCONIA;
SOLID-SOLUTION; FUEL-CELLS; ELECTROLYTES; PROGRAM; GROWTH; SYSTEM; ZRO2
AB Scandia-stabilized zirconia films were epitaxially grown on sapphire (0001) substrates by oxygen-plasma-assisted molecular beam epitaxy. The cubic phase was found to exist over a wider dopant concentration range than previously observed (4.6-17.6 mol.% Sc(2)O(3)). The monoclinic phase was observed for dopant concentrations of 1.5 mol.% and 22.5 mol.%. An increase in the fraction of the monoclinic phase relative to the cubic phase decreased the ionic conductivity. The highest conductivity in the temperature range of 460-900 degrees C was observed for 9.9 mol.% Sc(2)O(3). Atomistic computer simulations show that the observed composition dependence can be related to changes in migration barriers for O(2) ion transport with Sc(3+) substitution of Zr(4+) ions. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Devanathan, R.; Jiang, W.; Nachimuthu, P.; Shutthanandan, V.; Saraf, L.; Wang, C. M.; Kuchibhatla, S. V. N. T.; Thevuthasan, S.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Yu, Z. Q.] Nanjing Normal Univ, Dept Chem, Nanjing 210097, Peoples R China.
RP Devanathan, R (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA.
EM ram.devanathan@pnl.gov
RI Devanathan, Ram/C-7247-2008;
OI Devanathan, Ram/0000-0001-8125-4237; Jiang, Weilin/0000-0001-8302-8313
FU Battelle Memorial Institute for the US Department of Energy (DOE)
[DE-AC06-76RL01830]
FX The research was performed using EMSL, a national scientific user
facility sponsored by DOE's Office of Biological and Environmental
Research (BER) and located at Pacific Northwest National Laboratory
(PNNL). PNNL is operated by Battelle Memorial Institute for the US
Department of Energy (DOE) under the contract DE-AC06-76RL01830.
NR 22
TC 4
Z9 4
U1 1
U2 8
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0167-2738
J9 SOLID STATE IONICS
JI Solid State Ion.
PD MAR 29
PY 2010
VL 181
IS 8-10
BP 367
EP 371
DI 10.1016/j.ssi.2010.01.024
PG 5
WC Chemistry, Physical; Physics, Condensed Matter
SC Chemistry; Physics
GA 584VJ
UT WOS:000276781300001
ER
PT J
AU Harley, G
De Jonghe, LC
AF Harley, Gabriel
De Jonghe, Lutgard C.
TI Proton transport in doped La-metaphosphate glasses
SO SOLID STATE IONICS
LA English
DT Article
DE Phosphate glasses; Proton transport; AC spectroscopy
ID ELECTRICAL-CONDUCTION PROPERTIES; PHOSPHATE-GLASSES; AC CONDUCTIVITY;
OXIDE GLASSES; LAPO4; LAP3O9; WATER; ELECTROLYTES; DISSOLUTION;
IMPEDANCE
AB The electrical properties of [La(1-x)Mx]-P3O9 metaphosphate glasses, where M is Ba, Sr, Ca, and 0 <= x <= 0.8 were investigated in the 300-500 degrees C range. The protonic conductivity increases two orders of magnitude from the unsubstituted to the 60% substituted glass reaching a maximum conductivity of about 10(-5) S/cm at 450 degrees C. The activation energy is found to be approximately independent of concentration though dependent on the type of modifying substitutional cation, and decreases from about 1.04 eV for Ca and Sr to similar to 0.96 eV for Ba. AC impedance measurements were used to find the DC ionic conductivities. Mean ion travel distances at the frequencies, nu(center dot)(Z) or nu(center dot)(M), associated with the maximum in Z(n) or M-n were found to be up to 30 times larger than the average oxygen spacing in the glasses. While diffusion coefficients derived from conductivities, D-sigma, were vastly lower than an uncorrelated diffusion coefficient computed from first principles, the travel distance at nu(center dot)(Z) or nu(center dot)(Z) derived from a simple random walk expression using D-r, was surprisingly close to those derived from the more rigorous statistical treatments. The ratio xi=D-sigma/D-r << 1 may be interpreted as indicative of highly correlated ion motion and strongly reduced mean attempt frequencies, together with a mean activation energy for motion increased by Delta E=E-sigma-E-r over that of the uncorrelated intertetrahedral motion of an ideal crystal characterized by D-r. (C) 2010 Elsevier B.V. All rights reserved.
C1 [De Jonghe, Lutgard C.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
RP De Jonghe, LC (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
EM dejonghe@lbl.gov
FU Office of Science, Office of Basic Energy Sciences, Materials Sciences
FX The authors would like to particularly thank Klaus-Dieter Kreuer (MPI)
for his beneficial discussions and guidance. GH would also like to thank
J. Maier (MPI) for his support and discussion, S. Weiglein for the
administrative assistance, as well as U. Klock, A. Fuchs, Y. T. Liang,
and the MPI crystal preparation laboratory for the technical assistance.
Funding for this project was provided by the Director, Office of
Science, Office of Basic Energy Sciences, Materials Sciences
NR 40
TC 4
Z9 4
U1 3
U2 13
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0167-2738
EI 1872-7689
J9 SOLID STATE IONICS
JI Solid State Ion.
PD MAR 29
PY 2010
VL 181
IS 8-10
BP 424
EP 429
DI 10.1016/j.ssi.2010.01.015
PG 6
WC Chemistry, Physical; Physics, Condensed Matter
SC Chemistry; Physics
GA 584VJ
UT WOS:000276781300009
ER
PT J
AU Marina, OA
Coyle, CA
Thomsen, EC
Edwards, DJ
Coffey, GW
Pederson, LR
AF Marina, O. A.
Coyle, C. A.
Thomsen, E. C.
Edwards, D. J.
Coffey, G. W.
Pederson, L. R.
TI Degradation mechanisms of SOFC anodes in coal gas containing phosphorus
SO SOLID STATE IONICS
LA English
DT Article
DE Ni/YSZ anode; SOFC; Coal gas; Contaminant; Nickel phosphorus
interaction; Nickel phosphide
ID TRANSITION-METAL PHOSPHIDES; DEPARTMENT-OF-ENERGY; OXIDE FUEL-CELLS;
NI-P; THERMOCHEMICAL PROPERTIES; THERMODYNAMIC PROPERTIES;
PHASE-EQUILIBRIA; NICKEL; CATALYSTS; SURFACE
AB The interaction of phosphorus in synthetic coal gas with the nickel-based anode of solid oxide fuel cells has been investigated. Tests with both anode-supported and electrolyte-supported button cells were performed at 700 to 800 degrees C in synthetic coal gas containing 0.5 to 10 ppm phosphorus, which was introduced as phosphine. Two primary modes of degradation were observed. The most obvious was the formation of a series of bulk nickel phosphide phases, of which Ni(3)P, Ni(5)P(2), Ni(12)P(5) and Ni(2)P were identified. Phosphorus was essentially completely captured by the anode, forming a sharp boundary between converted and unconverted anode portions. These products partially coalesced into large grains, which eventually affected electronic percolation through the anode support. From thermodynamic calculations, formation of the first binary nickel phosphide phase is possible at phosphorus concentrations <1 ppb in coal gas at typical fuel cell operating temperatures. A second mode of degradation is attributed to surface diffusion of phosphorus to the active anode/electrolyte interface to form an adsorption layer. Direct evidence for the presence of such an adsorption layer on nickel was obtained by surface spectroscopies on fracture surfaces. Further, cell performance losses were observed well before the entire anode was converted to bulk nickel phosphide. Impedance spectroscopy revealed that these losses were primarily due to growth in electrodic resistance, whereas large ohmic increases were visible when the entire anode was converted to nickel phosphide phases. The rate of resistance growth for anode-supported cells showed a low dependence on phosphorus concentration, attributed to phosphorus activity control within the anode by bulk nickel phosphide products. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Marina, O. A.; Coyle, C. A.; Thomsen, E. C.; Edwards, D. J.; Coffey, G. W.; Pederson, L. R.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Marina, OA (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA.
EM olga.marina@pnl.gov
FU U.S. Department of Energy, Office of Fossil Energy, National Energy
Technology Laboratory (NETL) [AC06-76RLO 1830]
FX The authors would like to thank A.L Schemer-Kohrn for SEM analyses, M.H.
Engelhard for XPS analyses, Dr. Z. Zhu for ToF-SIMS analysis, C.E.
Chamberlin for SEM sample preparation, C.N. Cramer, N. Canfield and J.F.
Bonnett for cell fabrication, and Dr. Y.S. Chou for technical assistance
with coupon tests. Financial support from the U.S. Department of Energy,
Office of Fossil Energy, National Energy Technology Laboratory (NETL) as
part of the Solid State Energy Conversion Alliance (SECA) Coal-Based
Systems Core Research Program is gratefully acknowledged. Pacific
Northwest National Laboratory is operated by Battelle for the U.S.
Department of Energy under Contract AC06-76RLO 1830.
NR 49
TC 33
Z9 34
U1 2
U2 20
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0167-2738
J9 SOLID STATE IONICS
JI Solid State Ion.
PD MAR 29
PY 2010
VL 181
IS 8-10
BP 430
EP 440
DI 10.1016/j.ssi.2010.01.018
PG 11
WC Chemistry, Physical; Physics, Condensed Matter
SC Chemistry; Physics
GA 584VJ
UT WOS:000276781300010
ER
PT J
AU Castner, EW
Wishart, JF
AF Castner, Edward W., Jr.
Wishart, James F.
TI Spotlight on ionic liquids
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE liquid structure; physical chemistry
ID MOLECULAR-DYNAMICS SIMULATIONS; ELECTRON-TRANSFER REACTIONS;
SUM-FREQUENCY GENERATION; COMPLETE SOLVATION RESPONSE; X-RAY-SCATTERING;
ROOM-TEMPERATURE; PHYSICOCHEMICAL PROPERTIES; MOLTEN-SALT; VIBRATIONAL
SPECTROSCOPY; INTERMOLECULAR DYNAMICS
AB Ionic liquids are an emerging class of materials with a diverse and extraordinary set of properties. Understanding the origins of these properties and how they can be controlled by design to serve valuable practical applications presents a wide array of challenges and opportunities to the chemical physics and physical chemistry community. We highlight here some of the significant progress already made and future research directions in this exciting area.
C1 [Castner, Edward W., Jr.] Rutgers State Univ, Dept Chem & Chem Engn, Piscataway, NJ 08854 USA.
[Wishart, James F.] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
RP Castner, EW (reprint author), Rutgers State Univ, Dept Chem & Chem Engn, Piscataway, NJ 08854 USA.
EM castner@jcp.rutgers.edu; wishart@bnl.gov
RI Wishart, James/L-6303-2013
OI Wishart, James/0000-0002-0488-7636
FU National Science Foundation [CHE-0718391]; U.S. Department of Energy
[DE-FG02-09ER16118, DE-AC02-98CH10886]; Division of Chemical Sciences,
Office of Basic Energy Sciences
FX E.W.C. acknowledges support from the National Science Foundation through
Grant No. CHE-0718391 and from the U.S. Department of Energy by SISGR
Grant No. DE-FG02-09ER16118. J.F.W. acknowledges support from a SISGR
award under Contract No. DE-AC02-98CH10886 with the U.S. Department of
Energy and supported by its Division of Chemical Sciences, Office of
Basic Energy Sciences.
NR 138
TC 193
Z9 193
U1 7
U2 85
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-9606
EI 1089-7690
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 120901
DI 10.1063/1.3373178
PG 9
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700001
PM 20370103
ER
PT J
AU Knepley, MG
Karpeev, DA
Davidovits, S
Eisenberg, RS
Gillespie, D
AF Knepley, Matthew G.
Karpeev, Dmitry A.
Davidovits, Seth
Eisenberg, Robert S.
Gillespie, Dirk
TI An efficient algorithm for classical density functional theory in three
dimensions: Ionic solutions
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE density functional theory; ionic conductivity; liquids
ID FUNDAMENTAL-MEASURE-THEORY; MEAN SPHERICAL APPROXIMATION; CHARGED
HARD-SPHERES; WHITE BEAR VERSION; FREE-ENERGY MODEL; RYANODINE RECEPTOR;
CALCIUM-CHANNEL; FLUIDS; SELECTIVITY; MIXTURES
AB Classical density functional theory (DFT) of fluids is a valuable tool to analyze inhomogeneous fluids. However, few numerical solution algorithms for three-dimensional systems exist. Here we present an efficient numerical scheme for fluids of charged, hard spheres that uses O(N log N) operations and O(N) memory, where N is the number of grid points. This system-size scaling is significant because of the very large N required for three-dimensional systems. The algorithm uses fast Fourier transforms (FFTs) to evaluate the convolutions of the DFT Euler-Lagrange equations and Picard (iterative substitution) iteration with line search to solve the equations. The pros and cons of this FFT/Picard technique are compared to those of alternative solution methods that use real-space integration of the convolutions instead of FFTs and Newton iteration instead of Picard. For the hard-sphere DFT, we use fundamental measure theory. For the electrostatic DFT, we present two algorithms. One is for the "bulk-fluid" functional of Rosenfeld [Y. Rosenfeld, J. Chem. Phys. 98, 8126 (1993)] that uses O(N log N) operations. The other is for the "reference fluid density" (RFD) functional [D. Gillespie , J. Phys.: Condens. Matter 14, 12129 (2002)]. This functional is significantly more accurate than the bulk-fluid functional, but the RFD algorithm requires O(N(2)) operations.
C1 [Knepley, Matthew G.] Univ Chicago, Computat Inst, Chicago, IL 60637 USA.
[Karpeev, Dmitry A.] Argonne Natl Lab, Div Math & Comp Sci, Darien, IL 60439 USA.
[Davidovits, Seth] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10025 USA.
[Eisenberg, Robert S.; Gillespie, Dirk] Rush Univ, Med Ctr, Dept Mol Physiol & Biophys, Chicago, IL 60612 USA.
RP Knepley, MG (reprint author), Univ Chicago, Computat Inst, Chicago, IL 60637 USA.
EM knepley@ci.uchicago.edu; karpeev@mcs.anl.gov; beisenbe@rush.edu;
dirk_gillespie@rush.edu
RI Knepley, Matthew/C-1094-2015;
OI Knepley, Matthew/0000-0002-2292-0735; Gillespie,
Dirk/0000-0003-0802-5352
FU U.S. Army Research Laboratory; U.S. Army Research Office
[W911NF-09-1-0488]; NIH [GM076013]; U.S. Department of Energy
[DE-AC01-06CH11357]
FX This material is based upon work supported by, or in part by, the U.S.
Army Research Laboratory and the U.S. Army Research Office under
Contract No. W911NF-09-1-0488 (D.G. and M.G.K.). The work was also
supported by NIH Grant No. GM076013 (R.S.E.). M.G.K. was partially
supported by the U.S. Department of Energy under Contract No.
DE-AC01-06CH11357. We thank Roland Roth and Dezso Boda for helpful
discussions.
NR 28
TC 37
Z9 37
U1 0
U2 6
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 124101
DI 10.1063/1.3357981
PG 11
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700006
PM 20370108
ER
PT J
AU Li, H
Malinin, SV
Tretiak, S
Chernyak, VY
AF Li, Hao
Malinin, Sergey V.
Tretiak, Sergei
Chernyak, Vladimir Y.
TI Exciton scattering approach for branched conjugated molecules and
complexes. IV. Transition dipoles and optical spectra
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE excited states; molecular moments; organic compounds; oscillator
strengths; quantum chemistry
ID ENERGY-LOSS SPECTROSCOPY; ELECTRONIC EXCITATIONS; NANOSCALE SYSTEMS;
DENDRIMERS; DYNAMICS; LOCALIZATION; COHERENCE; OLIGOMERS; STATES
AB The electronic excitation energies and transition dipole moments are the essential ingredients to compute an optical spectrum of any molecular system. Here we extend the exciton scattering (ES) approach, originally developed for computing excitation energies in branched conjugated molecules, to the calculation of the transition dipole moments. The ES parameters that characterize contributions of molecular building blocks to the total transition dipole can be extracted from the quantum-chemical calculations of the excited states in simple molecular fragments. Using these extracted parameters, one can then effortlessly calculate the oscillator strengths and optical spectra of various large molecular structures. We illustrate application of this extended ES approach using an example of phenylacetylene-based molecules. Absorption spectra predicted by the ES approach show close agreement with the results of the reference quantum-chemical calculations.
C1 [Li, Hao; Malinin, Sergey V.; Chernyak, Vladimir Y.] Wayne State Univ, Dept Chem, Detroit, MI 48202 USA.
[Tretiak, Sergei] Los Alamos Natl Lab, Ctr Nonlinear Studies, Div Theoret, Los Alamos, NM 87545 USA.
[Tretiak, Sergei] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA.
RP Li, H (reprint author), Wayne State Univ, Dept Chem, 5101 Cass Ave, Detroit, MI 48202 USA.
EM serg@lanl.gov; chernyak@chem.wayne.edu
RI Li, Hao/B-4756-2013; Tretiak, Sergei/B-5556-2009; Chernyak,
Vladimir/F-5842-2016
OI Tretiak, Sergei/0000-0001-5547-3647; Chernyak,
Vladimir/0000-0003-4389-4238
FU National Science Foundation [CHE-0808910]; U.S. Department of Energy
[DE-AC52-06NA25396]; Center for Integrated Nanotechnology (CINT); Center
for Nonlinear Studies (CNLS)
FX This material is based upon work supported by the National Science
Foundation under Grant No. CHE-0808910. Los Alamos National Laboratory
is operated by Los Alamos National Security, LLC, for the National
Nuclear Security Administration of the U.S. Department of Energy under
Contract No. DE-AC52-06NA25396. We acknowledge support of Center for
Integrated Nanotechnology (CINT) and Center for Nonlinear Studies
(CNLS).
NR 37
TC 12
Z9 12
U1 0
U2 7
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-9606
EI 1089-7690
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 124103
DI 10.1063/1.3366521
PG 9
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700008
PM 20370110
ER
PT J
AU Liu, Y
Porcar, L
Hong, KL
Shew, CY
Li, X
Liu, E
Butler, PD
Herwig, KW
Smith, GS
Chen, WR
AF Liu, Yun
Porcar, Lionel
Hong, Kunlun
Shew, Chwen-Yang
Li, Xin
Liu, Emily
Butler, Paul D.
Herwig, Kenneth W.
Smith, Gregory S.
Chen, Wei-Ren
TI Effect of counterion valence on the pH responsiveness of polyamidoamine
dendrimer structure
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE association; neutron diffraction; pH; polymer structure; statistical
mechanics; thermodynamics
ID ANGLE NEUTRON-SCATTERING; POLY(AMIDOAMINE) PAMAM DENDRIMERS; INDUCED
CONFORMATIONAL-CHANGES; MOLECULAR-DYNAMICS; AQUEOUS-SOLUTIONS;
POLYELECTROLYTE DENDRIMERS; CHARGED DENDRIMER; GENERATION; PARTICLES;
SOLVENT
AB An accurate determination of the structure characteristics of protonated generation 5 polyamidoamine dendrimers in aqueous solution has been conducted by analyzing the small angle neutron scattering databased on a statistical mechanics model. In our investigation, the primary focus is to elucidate the effect of counterion valence on the counterion association and its impact on the intramolecular density profile within a dendrimer. In the range of our study for molecular protonation, a strong dependence of the structural properties of charged dendrimers on counterion valence is revealed. Our findings indicate that the association of a large amount of divalent counterions significantly reduces the effective charge of a dendrimer molecule. Surprisingly, no discernible transition of the density distribution profile is observed for the dendrimer charged by D(2)SO(4), as opposed to our previous observation of a pronounced transition in intramolecular density profile for the dendrimer charged by DCl. These findings may be understood from the thermodynamic processes of counterions.
C1 [Liu, Yun; Butler, Paul D.] Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA.
[Liu, Yun] Univ Delaware, Dept Chem Engn, Newark, DE 19716 USA.
[Porcar, Lionel] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France.
[Hong, Kunlun] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
[Shew, Chwen-Yang] CUNY Coll Staten Isl, Dept Chem, Staten Isl, NY 10314 USA.
[Li, Xin; Liu, Emily] Rensselaer Polytech Inst, Dept Mech Aerosp & Nucl Engn, Troy, NY 12180 USA.
[Herwig, Kenneth W.; Smith, Gregory S.; Chen, Wei-Ren] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA.
[Chen, Wei-Ren] Univ Tennessee, Dept Chem & Biomol Engn, Knoxville, TN 37996 USA.
RP Liu, Y (reprint author), Natl Inst Stand & Technol, Ctr Neutron Res, Gaithersburg, MD 20899 USA.
EM chenw@ornl.gov
RI Butler, Paul/D-7368-2011; Herwig, Kenneth/F-4787-2011; Liu,
Yun/F-6516-2012; Smith, Gregory/D-1659-2016; Hong, Kunlun/E-9787-2015
OI Liu, Yun/0000-0002-0944-3153; Smith, Gregory/0000-0001-5659-1805; Hong,
Kunlun/0000-0002-2852-5111
FU ORNL [05125, 05272]; NSF [DMR-0454672]; SUFD BES, U.S. DOE; City
University of New York
FX We gratefully acknowledge the support from the LDRD Program (Project ID
No. 05125 and 05272) of ORNL. The support of the NCNR NIST, U.S. DOC in
providing the neutron research facilities supported under NSF Agreement
No. DMR-0454672 is also acknowledged. Part of this research was carried
out at CNMS ORNL sponsored by the SUFD BES, U.S. DOE. We also thank the
support from the City University of New York PSC grants.
NR 41
TC 17
Z9 17
U1 2
U2 23
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 124901
DI 10.1063/1.3358349
PG 6
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700042
PM 20370144
ER
PT J
AU Niklasson, AMN
Challacombe, M
Tymczak, CJ
Nemeth, K
AF Niklasson, Anders M. N.
Challacombe, Matt
Tymczak, C. J.
Nemeth, Karoly
TI Trace correcting density matrix extrapolation in self-consistent
geometry optimization
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE extrapolation; matrix algebra; optimisation; perturbation theory; SCF
calculations
ID ELECTRONIC-STRUCTURE CALCULATIONS; AB-INITIO CALCULATIONS; FIELD THEORY;
SYSTEM-SIZE; FUNCTIONAL CALCULATIONS; MOLECULAR-DYNAMICS; SCALING
ALGORITHM; PURIFICATION; DIAGONALIZATION; APPROXIMATION
AB A linear scaling trace correcting density matrix extrapolation method is proposed for accelerated self-consistency convergence in geometry optimization. The technique is based on nonorthogonal trace correcting purification and perturbation theory. Compared with alternative schemes, extrapolated total energies are often an order of magnitude closer to the self-consistent solution. For insulators, the computational cost is low and it scales linearly with the size of the perturbed region affected by the modified geometry, O(N-pert). For local perturbations, the computational cost is therefore independent of the total size of the system and scales as O(1).
C1 [Niklasson, Anders M. N.; Challacombe, Matt] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Tymczak, C. J.] Texas So Univ, Dept Phys, Houston, TX 77004 USA.
[Nemeth, Karoly] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA.
[Nemeth, Karoly] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RP Niklasson, AMN (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
EM amn@lanl.gov
RI Nemeth, Karoly/L-7806-2014
OI Nemeth, Karoly/0000-0001-8366-1397
FU U.S. Department of Energy
FX We gratefully acknowledge the support of the U.S. Department of Energy
through the LANL LDRD/ER program for this work.
NR 50
TC 1
Z9 1
U1 1
U2 5
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 124104
DI 10.1063/1.3351785
PG 5
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700009
PM 20370111
ER
PT J
AU Santamaria, R
Soullard, J
Jellinek, J
AF Santamaria, Ruben
Soullard, Jacques
Jellinek, Julius
TI Thermal behavior of a 13-molecule hydrogen cluster under pressure
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE bond lengths; density functional theory; diffusion; hydrogen neutral
molecules; molecular clusters; molecular configurations; thermal
expansion; thermodynamic properties
ID EQUATION-OF-STATE; X-RAY-DIFFRACTION; COMPRESSED LIQUID DEUTERIUM; GPA
1.4 MBAR; DENSE HYDROGEN; MOLECULAR-HYDROGEN; SOLID HYDROGEN; MEGABAR
PRESSURES; FLUID HYDROGEN; ELECTRICAL-CONDUCTIVITY
AB The thermal behavior of a 13-molecule hydrogen cluster is studied as a function of pressure and temperature using a combination of trajectory and density functional theory simulations. The analysis is performed in terms of characteristic descriptors such as caloric curve, root-mean-square bond length fluctuation, pair correlation function, velocity autocorrelation function, volume thermal expansion, and diffusion coefficients. The discussion addresses on the peculiarities of the transition from the ordered-to-disordered state as exhibited by the cluster under different pressures and temperatures.
C1 [Santamaria, Ruben] Univ Nacl Autonoma Mexico, Inst Fis, Dept Fis Teor, Mexico City 01000, DF, Mexico.
[Soullard, Jacques] Univ Nacl Autonoma Mexico, Inst Fis, Dept Estado Solido, Mexico City 01000, DF, Mexico.
[Jellinek, Julius] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
RP Santamaria, R (reprint author), Univ Nacl Autonoma Mexico, Inst Fis, Dept Fis Teor, AP 20-364, Mexico City 01000, DF, Mexico.
EM rso@fisica.unam.mx; soullard@fisica.unam.mx; jellinek@anl.gov
FU U.S. Department of Energy [DE-AC-02-06CH11357]
FX We acknowledge CPU time allotment in KanBalam from DGSCA and helpful
discussions with Dr. Denis Boyer. This work is dedicated to Professor
Jean Pierre Daudey, a pioneer of molecular simulations in Mexico. J.J.
was supported by the Office of Basic Energy Sciences, Division of
Chemical Sciences, Geosciences, and Biosciences, U.S. Department of
Energy under Contract No. DE-AC-02-06CH11357.
NR 60
TC 5
Z9 5
U1 0
U2 4
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 124505
DI 10.1063/1.3359460
PG 7
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700029
PM 20370131
ER
PT J
AU Shubert, VA
Rednic, M
Pratt, ST
AF Shubert, V. Alvin
Rednic, Maria
Pratt, Stephen T.
TI Predissociation and dissociative ionization of Rydberg states of Xe-2
and the photodissociation of Xe-2+
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE fluorescence; molecule-photon collisions; photodissociation;
photoionisation; positive ions; potential energy surfaces;
predissociation; Rydberg states; two-photon processes; xenon
ID ENHANCED MULTIPHOTON IONIZATION; POTENTIAL-ENERGY CURVES; DISPERSIVE
PHOTOELECTRON-SPECTROSCOPY; ULTRAVIOLET-LASER SPECTROSCOPY; RESOLVED
2-PHOTON SPECTRA; HIGH-RESOLUTION SPECTRUM; ION-CORE ASSIGNMENTS;
DER-WAALS MOLECULES; VACUUM-ULTRAVIOLET; ELECTRONIC STATES
AB The Rydberg states of Xe-2 in the region between 76 000 and 84 000 cm(-1) were studied by using a combination of two-photon excitation and velocity map ion imaging. The electronic states in this region are based on the Xe(S-1(0))+Xe 6p and 5d dissociation limits, and the large number of states leads to numerous curve crossings and distorted potentials. These Rydberg states can decay by predissociation or fluorescence or can be photoionized, dissociatively photoionized, or photodissociated by the absorption of a single additional photon. Furthermore, the molecular ion can be photodissociated as well. While numerous other techniques have been applied to this problem, velocity map ion imaging provides a high resolution approach to determine the operative processes. When combined with existing data obtained by other methods, the present experiments allow a more complete understanding of the assignment and behavior of these states.
C1 [Shubert, V. Alvin; Rednic, Maria; Pratt, Stephen T.] Argonne Natl Lab, Argonne, IL 60439 USA.
RP Shubert, VA (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA.
RI Shubert, V. Alvin/C-6736-2011
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences, Division of Chemical Sciences, Geosciences, and Biosciences
[DE-AC02-06CH11357]; University of Chicago/Argonne Strategic
Collaborative Initiative
FX We would like to thank Dr. F. Spiegelmann for helpful discussions and
Dr. C. Jonin for providing numerical data for the potentials in Ref. 41.
This work was supported by the U.S. Department of Energy, Office of
Science, Office of Basic Energy Sciences, Division of Chemical Sciences,
Geosciences, and Biosciences, under Contract No. DE-AC02-06CH11357. M.R.
was supported by funding through the University of Chicago/Argonne
Strategic Collaborative Initiative.
NR 52
TC 11
Z9 11
U1 2
U2 8
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 124108
DI 10.1063/1.3356040
PG 14
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700013
PM 20370115
ER
PT J
AU Smith, RS
Matthiesen, J
Kay, BD
AF Smith, R. Scott
Matthiesen, Jesper
Kay, Bruce D.
TI Breaking through the glass ceiling: The correlation between the
self-diffusivity in and krypton permeation through deeply supercooled
liquid nanoscale methanol films
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE infrared spectra; krypton; liquid films; molecular beams; organic
compounds; self-diffusion; thermally stimulated desorption; vibrational
modes
ID AMORPHOUS SOLID WATER; TEMPERATURE; TRANSITION
AB Molecular beam techniques, temperature-programmed desorption (TPD), and reflection absorption infrared spectroscopy (RAIRS) are used to explore the relationship between krypton permeation through and the self-diffusivity of supercooled liquid methanol at temperatures (100-115 K) near the glass transition temperature, T-g (103 K). Layered films, consisting of CH3OH and CD3OH, are deposited on top of a monolayer of Kr on a graphene covered Pt(111) substrate at 25 K. Concurrent Kr TPD and RAIRS spectra are acquired during the heating of the composite film to temperatures above T-g. The CO vibrational stretch is sensitive to the local molecular environment and is used to determine the supercooled liquid diffusivity from the intermixing of the isotopic layers. We find that the Kr permeation and the diffusivity of the supercooled liquid are directly and quantitatively correlated. These results validate the rare-gas permeation technique as a tool for probing the diffusivity of supercooled liquids.
C1 [Smith, R. Scott; Matthiesen, Jesper; Kay, Bruce D.] Pacific NW Natl Lab, Fundamental & Computat Sci Directorate, Richland, WA 99352 USA.
RP Smith, RS (reprint author), Pacific NW Natl Lab, Fundamental & Computat Sci Directorate, POB 999,Mail Stop K8-88, Richland, WA 99352 USA.
EM scott.smith@pnl.gov; bruce.kay@pnl.gov
RI Matthiesen, Jesper/N-2477-2014; Smith, Scott/G-2310-2015
OI Matthiesen, Jesper/0000-0003-1040-1919; Smith, Scott/0000-0002-7145-1963
FU U.S. Department of Energy Office of Basic Energy Sciences; Division of
Chemical Sciences, Geosciences, and Biosciences; DOE's Office of
Biological and Environmental Research
FX This work was supported by the U.S. Department of Energy Office of Basic
Energy Sciences, Division of Chemical Sciences, Geosciences, and
Biosciences. The research was performed using EMSL, a national
scientific user facility sponsored by DOE's Office of Biological and
Environmental Research and located at Pacific Northwest National
Laboratory, which is operated for DOE by Battelle.
NR 26
TC 16
Z9 16
U1 1
U2 9
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 124502
DI 10.1063/1.3361664
PG 10
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700026
PM 20370128
ER
PT J
AU Wang, XB
Kowalski, K
Wang, LS
Xantheas, SS
AF Wang, Xue-Bin
Kowalski, Karol
Wang, Lai-Sheng
Xantheas, Sotiris S.
TI Stepwise hydration of the cyanide anion: A temperature-controlled
photoelectron spectroscopy and ab initio computational study of
CN-(H2O)(n), n=2-5
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE ab initio calculations; binding energy; carbon compounds; coupled
cluster calculations; hydrogen bonds; molecular clusters; photoelectron
spectra; solvation; spectral line shift; water
ID VIBRATIONAL-ENERGY RELAXATION; ARGON PREDISSOCIATION SPECTROSCOPY;
HYDROGEN-BONDING NETWORK; ION-CYCLOTRON RESONANCE; WATER CLUSTERS;
GAS-PHASE; INFRARED-SPECTROSCOPY; ELECTRON-AFFINITY; BINDING-ENERGIES;
COUPLED-CLUSTER
AB We report the study of microsolvated CN-(H2O)(n) (n=1-5) clusters in the gas phase using a combination of experimental and computational approaches. The hydrated cyanide clusters were produced by electrospray and their structural and energetic properties were probed using temperature-controlled photoelectron spectroscopy (PES) and ab initio electronic structure calculations. Comparison between the low temperature (LT,T=12 K) and the room-temperature (RT) spectra shows a 0.25 eV spectral blueshift in the binding energy of the n=1 cluster and a significant spectral sharpening and blueshift for n=2 and 3. The experimental results are complemented with ab initio electronic structure calculations at the MP2 and CCSD(T) levels of theory that identified several isomers on the ground state potential energy function arising from the ability of CN- to form hydrogen bonds with water via both the C and N ends. In all cases the N end seems to be the preferred hydration site for the water network. The excellent agreement between the low temperature measured PES spectra and the basis set- and correlation-corrected [at the CCSD(T) level of theory] calculated vertical detachment energies, viz., 3.85 versus 3.84 eV (n=0), 4.54 versus 4.54 eV (n=1), 5.20 versus 5.32 eV (n=2), 5.58 versus 5.50 eV (n=3), and 5.89 versus 5.87 eV (n=4), allow us to establish the hydration motif of cyanide. Its microsolvation pattern was found to be similar to that of the halide anions (Cl-, Br-, and I-) as well as other diatomic anions having cylindrical symmetry such as NO-, resulting to structures in which the ion resides on the surface of a water cluster. The exception is CN-(H2O)(2), for which one water molecule is bound to either side of the anion resulting in a quasilinear structure. For the n=3 cluster the anion was found to freely "tumble" on the surface of a water trimer, since the inclusion of zero-point energy even at T=0 K stabilizes the configuration of C-3 symmetry with respect to the one having the anion tilted toward the water cluster. For n=4 this motion is more restricted since the corresponding barrier at RT is 1.2 kcal/mol. It is also possible that at RT other isomers (lying within similar to 0.6 kcal/mol above the global minima) are also populated, resulting in the further broadening of the PES spectra.
C1 [Wang, Xue-Bin] Washington State Univ, Dept Phys, Richland, WA 99354 USA.
[Wang, Xue-Bin; Xantheas, Sotiris S.] Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
[Kowalski, Karol] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA.
[Wang, Lai-Sheng] Brown Univ, Dept Chem, Providence, RI 02912 USA.
RP Wang, XB (reprint author), Washington State Univ, Dept Phys, 2710 Univ Dr, Richland, WA 99354 USA.
EM xuebin.wang@pnl.gov; sotiris.xantheas@pnl.gov
RI Xantheas, Sotiris/L-1239-2015;
OI Xantheas, Sotiris/0000-0002-6303-1037
FU U.S. Department of Energy (DOE), Office of Basic Energy Sciences,
Division of Chemical Sciences, Geosciences and Biosciences; DOE's Office
of Biological and Environmental Research
FX This work was supported by the U.S. Department of Energy (DOE), Office
of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and
Biosciences, and was performed at the Environmental Molecular Sciences
Laboratory (EMSL), a national scientific user facility sponsored by
DOE's Office of Biological and Environmental Research and located at
Pacific Northwest National Laboratory, which is operated by Battelle for
the DOE. Computer resources were provided at the Molecular Science
Computing Facility (MSCF) in EMSL.
NR 72
TC 14
Z9 14
U1 1
U2 16
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2010
VL 132
IS 12
AR 124306
DI 10.1063/1.3360306
PG 10
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 577GF
UT WOS:000276209700020
PM 20370122
ER
PT J
AU Pindzola, MS
Ballance, CP
Ludlow, JA
Loch, SD
Colgan, J
AF Pindzola, M. S.
Ballance, C. P.
Ludlow, J. A.
Loch, S. D.
Colgan, J.
TI Electron-impact ionization of C-2
SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
LA English
DT Article
ID CROSS-SECTIONS; R-MATRIX; COLLISIONS; MOLECULES; ENERGIES
AB In support of tokamak edge plasma studies, we calculate the electron-impact ionization cross section for the ground state of the diatomic carbon molecule. Bound orbitals for C-2 and C-2(+) are calculated using a single-configuration self-consistent-field method based on a linear combination of Slater-type orbitals. Continuum distorted-wave orbitals are calculated using a two-dimensional lattice (r, theta), which is variable in the radial coordinate and constant in the angular coordinate. Using a perturbative configuration-average distorted-wave method, the first ab initio fully quantal ionization cross sections for C-2 at its equilibrium internuclear separation are presented.
C1 [Pindzola, M. S.; Ballance, C. P.; Ludlow, J. A.; Loch, S. D.] Auburn Univ, Dept Phys, Auburn, AL 36849 USA.
[Colgan, J.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM USA.
RP Pindzola, MS (reprint author), Auburn Univ, Dept Phys, Auburn, AL 36849 USA.
OI Colgan, James/0000-0003-1045-3858
FU US Department of Energy
FX We would to thank Professor Don Griffin for several useful discussions.
This work was supported in part by grants from the US Department of
Energy. Computational work was carried out at the National Energy
Research Scientific Computing Center in Oakland, California.
NR 25
TC 0
Z9 0
U1 0
U2 2
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-4075
J9 J PHYS B-AT MOL OPT
JI J. Phys. B-At. Mol. Opt. Phys.
PD MAR 28
PY 2010
VL 43
IS 6
AR 065201
DI 10.1088/0953-4075/43/6/065201
PG 4
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 565YW
UT WOS:000275336200009
ER
PT J
AU O'Dell, V
AF O'Dell, Vivian
TI REMOVING THE HAYSTACK - THE CMS TRIGGER AND DATA ACQUISITION SYSTEMS
SO MODERN PHYSICS LETTERS A
LA English
DT Review
AB The CMS Trigger and Data Acquisition Systems have been installed and commissioned and are awaiting data at the Large Hadron Collider. In this article, we describe what factors drove the design and architecture of the systems.
C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
RP O'Dell, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.
EM odell@fnal.gov
NR 2
TC 0
Z9 0
U1 0
U2 0
PU WORLD SCIENTIFIC PUBL CO PTE LTD
PI SINGAPORE
PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE
SN 0217-7323
J9 MOD PHYS LETT A
JI Mod. Phys. Lett. A
PD MAR 28
PY 2010
VL 25
IS 10
BP 749
EP 766
DI 10.1142/S0217732310032986
PG 18
WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical
SC Physics
GA 587EX
UT WOS:000276973700001
ER
PT J
AU Mazzotti, M
Tarafder, A
Cornel, J
Gritti, F
Guiochon, G
AF Mazzotti, Marco
Tarafder, Abhijit
Cornel, Jeroen
Gritti, Fabrice
Guiochon, Georges
TI Experimental evidence of a delta-shock in nonlinear chromatography
SO JOURNAL OF CHROMATOGRAPHY A
LA English
DT Article
DE Nonlinear chromatography; Equilibrium theory; Delta-shock; Traveling
spike; Generalized Langmuir isotherm
ID GENERALIZED LANGMUIR ISOTHERM; EQUILIBRIUM-THEORY; CONSERVATION-LAWS;
MASS-TRANSFER; LAYER; DESIGN
AB We report about anew type of composition front in nonlinear chromatography that is called delta-shock, which has to be added to the family of classical transitions, i.e. simple waves, shocks and semi-shocks. Recently, the occurrence of delta-shocks in the case of mixed competitive-cooperative isotherms of the lollowing type
n(i) = H(i)c(i)/1 - K(1)c(1) + K(2)c(2) (i = 1,2),
(with H(2) > H(1), where components 1 and 2 have anti-Langmuir and Langmuir adsorption behavior, respectively) was predicted theoretically and their behavior was analyzed in the frame of the equilibrium theory of chromatography. The delta-shock can be viewed as a growing traveling spike superimposed to the discontinuity separating the initial and the feed state, which propagates along the column at constant speed and constant rate of growth. In this work we complement these findings from an experimental point of view. The binary system consisting of phenetole (component 1) and 4-tert-butyl phenol (component 2) in methanol-water (about 2:1, v/v) on a Zorbax 300StableBond-C18 column from Agilent has been shown, through a series of overloaded pulse experiments and of frontal analysis experiments with the pure compounds, to be subject to the competitive-cooperative isotherm of the type above, up to rather large concentrations. This system does exhibit a delta-shock when the operating conditions are chosen according to theory, namely when phenetole initially saturating the column is displaced by 4-tert-butylphenol, both at high concentrations (the minimum concentrations exhibiting a fully developed delta-shock in this series of experiments were c(1) = 20 g/L and c(2) = 75 g/L). The propagation of the delta-shock matches the theoretical predictions in terms of both the effect of concentration and the effect of column length. This is the first experimental observation ever of a delta-shock in chromatography. It is noteworthy that the proof of the occurrence of the delta-shock reported here has been obtained in both laboratories cooperating in this project. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Mazzotti, Marco; Cornel, Jeroen] ETH, Inst Proc Engn, CH-8092 Zurich, Switzerland.
[Tarafder, Abhijit] ETH, Inst Chem & Bioengn, CH-8093 Zurich, Switzerland.
[Gritti, Fabrice; Guiochon, Georges] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA.
[Gritti, Fabrice; Guiochon, Georges] Oak Ridge Natl Lab, Div Chem & Analyt Sci, Oak Ridge, TN 37831 USA.
RP Mazzotti, M (reprint author), ETH, Inst Proc Engn, Sonneggstr 3, CH-8092 Zurich, Switzerland.
EM marco.mazzotti@ipe.mavt.ethz.ch
RI Mazzotti, Marco/M-1725-2016
NR 13
TC 24
Z9 24
U1 0
U2 3
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0021-9673
J9 J CHROMATOGR A
JI J. Chromatogr. A
PD MAR 26
PY 2010
VL 1217
IS 13
BP 2002
EP 2012
DI 10.1016/j.chroma.2010.01.059
PG 11
WC Biochemical Research Methods; Chemistry, Analytical
SC Biochemistry & Molecular Biology; Chemistry
GA 573OI
UT WOS:000275923000003
PM 20172527
ER
PT J
AU Lal, J
Fouquet, P
Maccarini, M
Makowski, L
AF Lal, Jyotsana
Fouquet, Peter
Maccarini, Marco
Makowski, Lee
TI Neutron Spin-Echo Studies of Hemoglobin and Myoglobin: Multiscale
Internal Dynamics
SO JOURNAL OF MOLECULAR BIOLOGY
LA English
DT Article
DE hemoglobin; myoglobin; protein dynamics; neutron spin echo; wide-angle
x-ray scattering
ID NORMAL-MODE ANALYSIS; PROTEIN DYNAMICS; INOSITOL HEXAPHOSPHATE;
QUATERNARY STRUCTURE; LIGANDED HEMOGLOBIN; BROWNIAN-MOTION; DIFFUSION;
VISCOSITY; SPECTROSCOPY; FLUCTUATION
AB Neutron spin-echo spectroscopy was used to study structural fluctuations that occur in hemoglobin (Hb) and myoglobin (Mb) in solution. Using neutron spin-echo data up to a very high momentum transfer q (similar to 0.62 angstrom(-1)), we characterized the internal dynamics of these proteins at the levels of dynamic pair correlation function and self-correlation function in the time range of several picoseconds to a few nanoseconds. In the same protein solution, data transition from pair correlation motion to self-correlation motion as the momentum transfer q increases. At low q, coherent scattering dominates; at high q, observations are largely due to incoherent scattering. The low q data were interpreted in terms of an effective diffusion coefficient; on the other hand, the high q data were interpreted in terms of mean square displacements. Comparison of data from the two homologous proteins collected at different temperatures and protein concentrations was used to assess the contributions made by translational and rotational diffusion and internal modes of motion to the data. The temperature dependence of decay times can be attributed to changes in the viscosity and temperature of the solvent, as predicted by the Stokes Einstein relationship. This is true for contributions from both diffusive and internal modes of motion, indicating an intimate relationship between the internal dynamics of the proteins and the viscosity of the solvent. Viscosity change associated with protein concentration can account for changes in diffusion observed at different concentrations, but is apparently not the only factor involved in the changes in internal dynamics observed with change in protein concentration. Data collected at high q indicate that internal modes in Mb are generally faster than those in Fib, perhaps due to the greater surface-to-volume ratio of Mb and the fact that surface groups tend to exhibit faster motion than buried groups. Comparison of data from Fib and data from Mb at low q indicates an unexpectedly rapid motion of Fib alpha beta dimers relative to one another. Dynamic motion of subunits is increasingly perceived as important to the allosteric behavior of Fib. Our data demonstrate that this motion is highly sensitive to protein concentration, temperature, and solvent viscosity, indicating that great care needs to be exercised in interpreting its effect on protein function. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Lal, Jyotsana; Makowski, Lee] Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA.
[Fouquet, Peter; Maccarini, Marco] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France.
RP Makowski, L (reprint author), Argonne Natl Lab, Biosci Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM lmakowski@anl.gov
RI Fouquet, Peter/B-5212-2008; ID, BioCAT/D-2459-2012; Maccarini,
Marco/A-1894-2015
OI Fouquet, Peter/0000-0002-5542-0059; Maccarini, Marco/0000-0002-4555-3288
FU US Department of Energy [DE-AC02-06CH11357, W-31-109-ENG-38]; National
Institutes of Health [RR-08630]
FX We would like to thank R. Fischetti, D. Gore, S. Mandava, and D. Rodi
for assistance with the WAXS experiments; Dennis Liang for help with the
SANS experiments; and C. Ho for informative discussions. We have
benefited from the dedicated efforts of an anonymous referee whose
comments have considerably improved this report. The use of the Advanced
Photon Source was supported by the US Department of Energy under
contracts DE-AC02-06CH11357; and W-31-109-ENG-38. Data collection at
BioCAT was supported by National Institutes of Health research Center
grant RR-08630.
NR 48
TC 14
Z9 14
U1 1
U2 14
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0022-2836
J9 J MOL BIOL
JI J. Mol. Biol.
PD MAR 26
PY 2010
VL 397
IS 2
BP 423
EP 435
DI 10.1016/j.jmb.2010.01.029
PG 13
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 578DI
UT WOS:000276273300006
PM 20096701
ER
PT J
AU Thompson, LH
Jones, NJ
AF Thompson, Larry H.
Jones, Nigel J.
TI Stabilizing and Remodeling the Blocked DNA Replication Fork: Anchoring
FANCM and the Fanconi Anemia Damage Response
SO MOLECULAR CELL
LA English
DT Editorial Material
ID COMPLEX
C1 [Thompson, Larry H.] Lawrence Livermore Natl Lab, Biol & Biotechnol Div, Livermore, CA 94551 USA.
[Jones, Nigel J.] Univ Liverpool, Sch Biol Sci, Liverpool L69 7ZB, Merseyside, England.
RP Thompson, LH (reprint author), Lawrence Livermore Natl Lab, Biol & Biotechnol Div, L452,POB 808, Livermore, CA 94551 USA.
EM thompson14@llnl.gov; njjones@liv.ac.uk
RI Jones, Nigel/D-1997-2010
FU NCI NIH HHS [CA112566]
NR 11
TC 6
Z9 6
U1 0
U2 3
PU CELL PRESS
PI CAMBRIDGE
PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA
SN 1097-2765
J9 MOL CELL
JI Mol. Cell
PD MAR 26
PY 2010
VL 37
IS 6
BP 749
EP 751
DI 10.1016/j.molcel.2010.03.003
PG 3
WC Biochemistry & Molecular Biology; Cell Biology
SC Biochemistry & Molecular Biology; Cell Biology
GA 576HM
UT WOS:000276135100003
PM 20347418
ER
PT J
AU Li, YB
Sun, Z
Ma, L
Zhang, X
Yao, MZ
Joly, AG
Liu, ZL
Chen, W
AF Li, Yuebin
Sun, Zhong
Ma, Lun
Zhang, Xing
Yao, Mingzhen
Joly, Alan G.
Liu, Zuli
Chen, Wei
TI Synthesis and luminescence of CePO4:Tb/LaPO4 core/sheath nanowires
SO NANOTECHNOLOGY
LA English
DT Article
ID LIQUID-PHASE SYNTHESIS; LIGHT-EMITTING-DIODES; QUANTUM DOTS; FLUORESCENT
NANOPARTICLES; OXIDE NANOPARTICLES; CANCER-TREATMENT; NANOCRYSTALS;
PARTICLES; RADIATION; LAPO4-EU
AB CePO4:Tb/LaPO4 nanowires with a core/sheath architecture have been successful synthesized by a facile aqueous chemical method mediated by original CePO4:Tb aggregation seeds. The seed crystals serve as both a luminescence center and a nucleation site for epitaxial growth. The seed nanocrystals have an irregular sphere-like shape with an average size of around 6.8 nm and a narrow size distribution. When the seed crystals are coated with LaPO4, the resulting core/sheath CePO4:Tb/LaPO4 nanowires have mean diameters of about 7.6 nm and lengths up to 331 nm. Both photo-and x-ray luminescence demonstrate that the LaPO4 coating increases the luminescence efficiency. These core/sheath structured nanowires may find potential applications in solid state lighting, medical imaging and radiation detection.
C1 [Li, Yuebin; Sun, Zhong; Ma, Lun; Zhang, Xing; Yao, Mingzhen; Chen, Wei] Univ Texas Arlington, Dept Phys, Arlington, TX 76019 USA.
[Li, Yuebin; Liu, Zuli] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China.
[Joly, Alan G.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Li, YB (reprint author), Univ Texas Arlington, Dept Phys, POB 19059, Arlington, TX 76019 USA.
EM weichen@uta.edu
RI Li, Yuebin/D-6599-2011
FU UTA; NSF; DHS joint program [2008-DN-077-ARI016-03]; US Army Medical
Research Acquisition Activity (USAMRAA) [W81XWH-05-C-0101, BC095348,
PC094562]; Hi-Tech Research and Development Program of China (the 863
program) [2007AA03Z312]; NNSF of China [10574047]; China Scholarship
Council; Department of Energy's Office of Biological and Environmental
Research [DE-AC06-76RLO1830]
FX We would like to acknowledge the support from the Startup funds from
UTA, the NSF and DHS joint program (2008-DN-077-ARI016-03), and the US
Army Medical Research Acquisition Activity (USAMRAA) under contract no.
W81XWH-05-C-0101; BC095348 and PC094562. Zuli Liu would like to
acknowledge support from the Hi-Tech Research and Development Program of
China (the 863 program, no. 2007AA03Z312) and the NNSF of China
(10574047) and Yuebin Li would like to acknowledge partial support from
the China Scholarship Council. Part of the research described was
performed at the W R Wiley Environmental Molecular Sciences Laboratory,
a national scientific user facility sponsored by the Department of
Energy's Office of Biological and Environmental Research and located at
the Pacific Northwest National Laboratory (PNNL). PNNL is operated by
Battelle for the US Department of Energy under contract
DE-AC06-76RLO1830.
NR 57
TC 4
Z9 4
U1 1
U2 24
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0957-4484
EI 1361-6528
J9 NANOTECHNOLOGY
JI Nanotechnology
PD MAR 26
PY 2010
VL 21
IS 12
AR 125604
DI 10.1088/0957-4484/21/12/125604
PG 7
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Physics, Applied
SC Science & Technology - Other Topics; Materials Science; Physics
GA 564OH
UT WOS:000275224100020
PM 20203357
ER
PT J
AU Ramanathan, M
Skudlarek, G
Wang, HH
Darling, SB
AF Ramanathan, M.
Skudlarek, G.
Wang, H. H.
Darling, S. B.
TI Crossover behavior in the hydrogen sensing mechanism for palladium
ultrathin films
SO NANOTECHNOLOGY
LA English
DT Article
ID ELECTRICAL-CONDUCTION; CARBON NANOTUBES; MESOWIRE ARRAYS; GAS-DETECTION;
SENSORS; PD; ABSORPTION; RESISTIVITY; SWITCHES; SURFACE
AB Palladium has been extensively studied as a material for hydrogen sensors because of the simplicity of its reversible resistance change when exposed to hydrogen gas. Various palladium films and nanostructures have been used, and different responses have been observed with these diverse morphologies. In some cases, such as with nanowires, the resistance will decrease, whereas in others, such as with thick films, the resistance will increase. Each of these mechanisms has been explored for several palladium structures, but the crossover between them has not been systematically investigated. Here we report on a study aimed at deciphering the nanostructure-property relationships of ultrathin palladium films used as hydrogen gas sensors. The crossover in these films is observed at a thickness of similar to 5 nm. Ramifications for future sensor developments are discussed.
C1 [Ramanathan, M.; Darling, S. B.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
[Wang, H. H.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Skudlarek, G.] Illinois Math & Sci Acad, Aurora, IL 60506 USA.
RP Ramanathan, M (reprint author), Argonne Natl Lab, Ctr Nanoscale Mat, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM darling@anl.gov
RI Ramanathan, Muruganathan/B-6890-2011; Ramanathan,
Muruganathan/A-3641-2013
OI Ramanathan, Muruganathan/0000-0001-7008-1131
FU US Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-06CH11357]
FX The authors thank J Pearson for assistance with sputter deposition and M
Zach for insightful discussions. Use of the Center for Nanoscale
Materials was supported by the US Department of Energy, Office of
Science, Office of Basic Energy Sciences, under Contract No.
DE-AC02-06CH11357.
NR 30
TC 29
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U1 2
U2 16
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0957-4484
J9 NANOTECHNOLOGY
JI Nanotechnology
PD MAR 26
PY 2010
VL 21
IS 12
AR 125501
DI 10.1088/0957-4484/21/12/125501
PG 6
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Physics, Applied
SC Science & Technology - Other Topics; Materials Science; Physics
GA 564OH
UT WOS:000275224100012
PM 20195017
ER
PT J
AU Bussmann, E
Swartzentruber, BS
AF Bussmann, E.
Swartzentruber, B. S.
TI Ge Diffusion at the Si(100) Surface
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID SCANNING-TUNNELING-MICROSCOPY; ISLAND FORMATION; SELF-DIFFUSION;
AD-DIMER; SI(001); SI; GROWTH; KINETICS; NANOCRYSTALS; TRANSITION
AB Using scanning tunneling microscopy movies, we directly observe individual embedded Ge atoms to be mobile within the Si(100)-(2 x 1)-Ge surface at temperatures as low as 90 degrees C. We demonstrate that Ge atoms move by exchange diffusion with (1) adsorbed monomers and (2) individual constituent atoms of adsorbed dimers. Our observations are consistent with recent density-functional theory calculations, which give the atomistic pathways and energetic barriers for both exchange mechanisms. We find that neither adsorbed monomers nor dimers can diffuse more than a few nanometers between exchange events, illustrating how Ge diffusion and intermixing are intimately coupled at the nanoscale on the Si(100) surface.
C1 [Bussmann, E.; Swartzentruber, B. S.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Bussmann, E (reprint author), CINaM, Marseille, France.
FU Office of Basic Energy Sciences, Division of Material Sciences and
Engineering; Center for Integrated Nanotechnologies; U.S. DOE-BES
[DE-AC04-94AL85000]
FX We thank N. C. Bartelt, R. Stumpf, and G. L. Kellogg for useful
discussions. This work was supported by the Office of Basic Energy
Sciences, Division of Material Sciences and Engineering, and was
performed, in part, at the Center for Integrated Nanotechnologies, a
U.S. DOE-BES user facility. Sandia National Laboratories is a
multiprogram laboratory operated by Sandia Corporation, a Lockheed
Martin Company, for the U.S. Department of Energy under Contract No.
DE-AC04-94AL85000.
NR 32
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U1 1
U2 25
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD MAR 26
PY 2010
VL 104
IS 12
AR 126101
DI 10.1103/PhysRevLett.104.126101
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 575MY
UT WOS:000276072400034
PM 20366550
ER
PT J
AU Faustlin, RR
Bornath, T
Doppner, T
Dusterer, S
Forster, E
Fortmann, C
Glenzer, SH
Gode, S
Gregori, G
Irsig, R
Laarmann, T
Lee, HJ
Li, B
Meiwes-Broer, KH
Mithen, J
Nagler, B
Przystawik, A
Redlin, H
Redmer, R
Reinholz, H
Ropke, G
Tavella, F
Thiele, R
Tiggesbaumker, J
Toleikis, S
Uschmann, I
Vinko, SM
Whitcher, T
Zastrau, U
Ziaja, B
Tschentscher, T
AF Faeustlin, R. R.
Bornath, Th.
Doeppner, T.
Duesterer, S.
Foerster, E.
Fortmann, C.
Glenzer, S. H.
Goede, S.
Gregori, G.
Irsig, R.
Laarmann, T.
Lee, H. J.
Li, B.
Meiwes-Broer, K. -H.
Mithen, J.
Nagler, B.
Przystawik, A.
Redlin, H.
Redmer, R.
Reinholz, H.
Roepke, G.
Tavella, F.
Thiele, R.
Tiggesbaeumker, J.
Toleikis, S.
Uschmann, I.
Vinko, S. M.
Whitcher, T.
Zastrau, U.
Ziaja, B.
Tschentscher, Th.
TI Observation of Ultrafast Nonequilibrium Collective Dynamics in Warm
Dense Hydrogen
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID RAY THOMSON SCATTERING; FREE-ELECTRON-LASER; EXTREME-ULTRAVIOLET;
PLASMAS; PHOTOABSORPTION; RADIATION; WATER
AB We investigate ultrafast (fs) electron dynamics in a liquid hydrogen sample, isochorically and volumetrically heated to a moderately coupled plasma state. Thomson scattering measurements using 91.8 eV photons from the free-electron laser in Hamburg (FLASH at DESY) show that the hydrogen plasma has been driven to a nonthermal state with an electron temperature of 13 eV and an ion temperature below 0.1 eV, while the free-electron density is 2: 8 x 10(20) cm(-3). For dense plasmas, our experimental data strongly support a nonequilibrium kinetics model that uses impact ionization cross sections based on classical free-electron collisions.
C1 [Faeustlin, R. R.; Duesterer, S.; Laarmann, T.; Redlin, H.; Tavella, F.; Toleikis, S.] DESY, D-22607 Hamburg, Germany.
[Bornath, Th.; Goede, S.; Irsig, R.; Meiwes-Broer, K. -H.; Przystawik, A.; Redmer, R.; Reinholz, H.; Roepke, G.; Thiele, R.; Tiggesbaeumker, J.] Univ Rostock, Inst Phys, D-18051 Rostock, Germany.
[Doeppner, T.; Glenzer, S. H.] Lawrence Livermore Natl Lab, L 399, Livermore, CA 94551 USA.
[Foerster, E.; Uschmann, I.; Zastrau, U.] Univ Jena, IOQ, D-07743 Jena, Germany.
[Fortmann, C.] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA.
[Gregori, G.; Mithen, J.; Nagler, B.; Vinko, S. M.; Whitcher, T.] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England.
[Lee, H. J.] SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA.
[Li, B.] Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England.
[Ziaja, B.] CFEL, D-22607 Hamburg, Germany.
[Ziaja, B.] Inst Nucl Phys, PL-31342 Krakow, Poland.
[Tschentscher, Th.] European XFEL GmbH, D-22761 Hamburg, Germany.
RP Faustlin, RR (reprint author), DESY, Notkestr 85, D-22607 Hamburg, Germany.
EM thomas.tschentscher@xfel.eu
RI Redmer, Ronald/F-3046-2013; Vinko, Sam/I-4845-2013;
OI Vinko, Sam/0000-0003-1016-0975; Thiele, Robert/0000-0001-8350-9942;
Zastrau, Ulf/0000-0002-3575-4449
FU Helmholtz Gemeinschaft via the Virtual Institute [VH-VI-104]; German
Federal Ministry for Education and Research [FSP 301-FLASH]; Deutsche
Forschungsgemeinschaft (DFG) [SFB 652, LA 1431/2-1, GRK 1355]; LDRDs
[08-ERI-002, 08-LW-004]; Alexander von Humboldt foundation; Engineering
and Physical Sciences Research Council [EP/G007187/1]; Science and
Technology Facilities Council of the UK
FX We thankfully acknowledge financial support by the Helmholtz
Gemeinschaft via the Virtual Institute VH-VI-104, the German Federal
Ministry for Education and Research via Project No. FSP 301-FLASH, and
the Deutsche Forschungsgemeinschaft (DFG) via the
Sonderforschungsbereich SFB 652. T. L. acknowledges DFG support under
Grant No. LA 1431/2-1, R. R. F. under Grant No. GRK 1355. The work of S.
H. G. and T. D. was performed under the auspices of the U. S. Department
of Energy by Lawrence Livermore National Laboratory under Contract No.
DE-AC52-07NA27344 and was supported by LDRDs 08-ERI-002, 08-LW-004. S.
H. G. and C. F. were supported by the Alexander von Humboldt foundation,
G. G. partially by the Engineering and Physical Sciences Research
Council (Grant No. EP/G007187/1) and the Science and Technology
Facilities Council of the UK. Finally, the authors are greatly indebted
to the FLASH team for enabling an outstanding performance.
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD MAR 26
PY 2010
VL 104
IS 12
AR 125002
DI 10.1103/PhysRevLett.104.125002
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 575MY
UT WOS:000276072400024
PM 20366540
ER
PT J
AU Jones, B
Ampleford, DJ
Vesey, RA
Cuneo, ME
Coverdale, CA
Waisman, EM
Jones, MC
Fowler, WE
Stygar, WA
Serrano, JD
Vigil, MP
Esaulov, AA
Kantsyrev, VL
Safronova, AS
Williamson, KM
Chuvatin, AS
Rudakov, LI
AF Jones, B.
Ampleford, D. J.
Vesey, R. A.
Cuneo, M. E.
Coverdale, C. A.
Waisman, E. M.
Jones, M. C.
Fowler, W. E.
Stygar, W. A.
Serrano, J. D.
Vigil, M. P.
Esaulov, A. A.
Kantsyrev, V. L.
Safronova, A. S.
Williamson, K. M.
Chuvatin, A. S.
Rudakov, L. I.
TI Planar Wire-Array Z-Pinch Implosion Dynamics and X-Ray Scaling
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID RADIATIVE PROPERTIES
AB An indirect drive configuration is proposed wherein multiple compact Z-pinch x-ray sources surround a secondary hohlraum. Planar compact wire arrays allow reduced primary hohlraum surface area compared to cylindrical loads. Implosions of planar arrays are studied at up to 15 TW x-ray power on Saturn with radiated yields exceeding the calculated kinetic energy, suggesting other heating paths. X-ray power and yield scaling studied from 1-6 MA motivates viewfactor modeling of four 6-MA planar arrays producing 90 eV radiation temperature in a secondary hohlraum.
C1 [Jones, B.; Ampleford, D. J.; Vesey, R. A.; Cuneo, M. E.; Coverdale, C. A.; Waisman, E. M.; Jones, M. C.; Fowler, W. E.; Stygar, W. A.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Serrano, J. D.] Ktech Corp Inc, Albuquerque, NM 87123 USA.
[Vigil, M. P.] LMATA Govt Serv LLC, Albuquerque, NM 87109 USA.
[Esaulov, A. A.; Kantsyrev, V. L.; Safronova, A. S.; Williamson, K. M.] Univ Nevada, Reno, NV 89557 USA.
[Chuvatin, A. S.] Ecole Polytech, Lab Phys Plasmas, F-91128 Palaiseau, France.
[Rudakov, L. I.] Icarus Res, Bethesda, MD 20824 USA.
RP Jones, B (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM bmjones@sandia.gov
FU DOE and NNSA [DE-FC52-06NA27586, DE-FC52-06NA27588, DE-FC52-06NA27616,
DOE/SNL 681371]
FX The authors would like to thank the Saturn, Z, and Zebra operations
teams and J. L. Porter for supporting these experiments, and E. P. Yu
for valuable discussion. This work was supported by Sandia LDRD funding.
Sandia is a multiprogram laboratory operated by Sandia Corporation, a
Lockheed Martin Company, for the US DOE's National Nuclear Security
Administration under contract DE-AC04-94AL85000. The work at the
University of Nevada, Reno is supported by DOE and NNSA under
Cooperative Agreements DE-FC52-06NA27586, DE-FC52-06NA27588, and in part
by DE-FC52-06NA27616 and by the grant DOE/SNL 681371.
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD MAR 26
PY 2010
VL 104
IS 12
AR 125001
DI 10.1103/PhysRevLett.104.125001
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 575MY
UT WOS:000276072400023
PM 20366539
ER
PT J
AU Kenzelmann, M
Gerber, S
Egetenmeyer, N
Gavilano, JL
Strassle, T
Bianchi, AD
Ressouche, E
Movshovich, R
Bauer, ED
Sarrao, JL
Thompson, JD
AF Kenzelmann, M.
Gerber, S.
Egetenmeyer, N.
Gavilano, J. L.
Straessle, Th
Bianchi, A. D.
Ressouche, E.
Movshovich, R.
Bauer, E. D.
Sarrao, J. L.
Thompson, J. D.
TI Evidence for a Magnetically Driven Superconducting Q Phase of CeCoIn5
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID FIELD
AB We have studied the magnetic order inside the superconducting phase of CeCoIn5 for fields along the [1 0 0] crystallographic direction using neutron diffraction. We find a spin-density wave order with an incommensurate modulation Q = (q, q, 1/2) and q = 0.45(1), which within our experimental uncertainty is indistinguishable from the spin-density wave found for fields applied along [1 - 10]. The magnetic order is thus modulated along the lines of nodes of the d(x2-y2) superconducting order parameter, suggesting that it is driven by the electron nesting along the superconducting line nodes. We postulate that the onset of magnetic order leads to reconstruction of the superconducting gap function and a magnetically induced pair density wave.
C1 [Kenzelmann, M.] Paul Scherrer Inst, Lab Dev & Methods, CH-5232 Villigen, Switzerland.
[Gerber, S.; Egetenmeyer, N.; Gavilano, J. L.; Straessle, Th] ETH, Neutron Scattering Lab, CH-5232 Villigen, Switzerland.
[Bianchi, A. D.] Univ Montreal, Dept Phys & Regroupement Quebecois Mat Pointe, Montreal, PQ H3C 3J7, Canada.
[Ressouche, E.] INAC SPSMS MDN, CEA Grenoble, F-38054 Grenoble 9, France.
[Movshovich, R.; Bauer, E. D.; Sarrao, J. L.; Thompson, J. D.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Kenzelmann, M (reprint author), Paul Scherrer Inst, Lab Dev & Methods, CH-5232 Villigen, Switzerland.
RI Bauer, Eric/D-7212-2011; Gerber, Simon/A-4566-2012; Gavilano,
Jorge/H-4910-2012; Kenzelmann, Michel/A-8438-2008; Bianchi,
Andrea/E-9779-2010;
OI Gerber, Simon/0000-0002-5717-2626; Kenzelmann,
Michel/0000-0001-7913-4826; Bianchi, Andrea/0000-0001-9340-6971; Bauer,
Eric/0000-0003-0017-1937
FU Swiss NSF [200021-122054]; Swiss NCCR program MaNEP; U.S. Department of
Energy; Los Alamos Laboratory Directed Research and Development program;
Natural Sciences and Engineering Research Council of Canada (Canada);
Fonds Quebecois de la Recherche sur la Nature et les Technologies
(Quebec); Canada Research Chair Foundation
FX We thank M. Sigrist, Y. Yanase, and D. Agterberg for discussions and
acknowledge the technical services of ILL. This work was supported by
the Swiss NSF (Contract No. 200021-122054) and by the Swiss NCCR program
MaNEP. Work at Los Alamos was performed under the auspices of the U.S.
Department of Energy and supported in part by the Los Alamos Laboratory
Directed Research and Development program. A. D. B. received support
from the Natural Sciences and Engineering Research Council of Canada
(Canada), Fonds Quebecois de la Recherche sur la Nature et les
Technologies (Quebec), and the Canada Research Chair Foundation.
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD MAR 26
PY 2010
VL 104
IS 12
AR 127001
DI 10.1103/PhysRevLett.104.127001
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 575MY
UT WOS:000276072400042
PM 20366558
ER
PT J
AU Vaz, CAF
Hoffman, J
Segal, Y
Reiner, JW
Grober, RD
Zhang, Z
Ahn, CH
Walker, FJ
AF Vaz, C. A. F.
Hoffman, J.
Segal, Y.
Reiner, J. W.
Grober, R. D.
Zhang, Z.
Ahn, C. H.
Walker, F. J.
TI Origin of the Magnetoelectric Coupling Effect in
Pb(Zr0.2Ti0.8)O-3/La0.8Sr0.2MnO3 Multiferroic Heterostructures
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID MN K-EDGE; MANGANITES
AB The electronic valence state of Mn in Pb(Zr0.2Ti0.8)O-3/La0.8Sr0.2MnO3 multiferroic heterostructures is probed by near edge x-ray absorption spectroscopy as a function of the ferroelectric polarization. We observe a temperature independent shift in the absorption edge of Mn associated with a change in valency induced by charge carrier modulation in the La0.8Sr0.2MnO3, demonstrating the electronic origin of the magnetoelectric effect. Spectroscopic, magnetic, and electric characterization shows that the large magnetoelectric response originates from a modified interfacial spin configuration, opening a new pathway to the electronic control of spin in complex oxide materials.
C1 [Vaz, C. A. F.; Hoffman, J.; Segal, Y.; Reiner, J. W.; Grober, R. D.; Ahn, C. H.; Walker, F. J.] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA.
[Zhang, Z.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RP Vaz, CAF (reprint author), Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA.
EM carlos.vaz@yale.edu
RI Vaz, Carlos/A-7240-2012; Zhang, Zhan/A-9830-2008;
OI Vaz, Carlos/0000-0002-6209-8918; Zhang, Zhan/0000-0002-7618-6134;
Walker, Frederick/0000-0002-8094-249X
FU NSF [DMR 0520495]; FENA; NRI; DOE, Office of Science, Office of Basic
Energy Sciences [DE-AC02-06CH11357]
FX The authors acknowledge financial support by the NSF through MRSEC DMR
0520495 (CRISP), FENA, and the NRI. Use of the Advanced Photon Source
was supported by the DOE, Office of Science, Office of Basic Energy
Sciences, under Contract No. DE-AC02-06CH11357.
NR 27
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD MAR 26
PY 2010
VL 104
IS 12
AR 127202
DI 10.1103/PhysRevLett.104.127202
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 575MY
UT WOS:000276072400044
PM 20366560
ER
PT J
AU Parks, JE
AF Parks, James E., II
TI Less Costly Catalysts for Controlling Engine Emissions
SO SCIENCE
LA English
DT Editorial Material
ID NOX-STORAGE; PT/BAO/AL2O3
C1 Oak Ridge Natl Lab, Fuels Engines & Emiss Res Ctr, Knoxville, TN 37932 USA.
RP Parks, JE (reprint author), Oak Ridge Natl Lab, Fuels Engines & Emiss Res Ctr, Knoxville, TN 37932 USA.
EM parksjeii@ornl.gov
NR 10
TC 23
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U1 3
U2 27
PU AMER ASSOC ADVANCEMENT SCIENCE
PI WASHINGTON
PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA
SN 0036-8075
J9 SCIENCE
JI Science
PD MAR 26
PY 2010
VL 327
IS 5973
BP 1584
EP 1585
DI 10.1126/science.1187154
PG 2
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 574ED
UT WOS:000275970600022
PM 20339054
ER
PT J
AU Ahmed, Z
Akerib, DS
Arrenberg, S
Bailey, CN
Balakishiyeva, D
Baudis, L
Bauer, DA
Brink, PL
Bruch, T
Bunker, R
Cabrera, B
Caldwell, DO
Cooley, J
Cushman, P
Daal, M
DeJongh, F
Dragowsky, MR
Duong, L
Fallows, S
Figueroa-Feliciano, E
Filippini, J
Fritts, M
Golwala, SR
Grant, DR
Hall, J
Hennings-Yeomans, R
Hertel, SA
Holmgren, D
Hsu, L
Huber, ME
Kamaev, O
Kiveni, M
Kos, M
Leman, SW
Mahapatra, R
Mandic, V
McCarthy, KA
Mirabolfathi, N
Moore, D
Nelson, H
Ogburn, RW
Phipps, A
Pyle, M
Qiu, X
Ramberg, E
Rau, W
Reisetter, A
Saab, T
Sadoulet, B
Sander, J
Schnee, RW
Seitz, DN
Serfass, B
Sundqvist, KM
Tarka, M
Wikus, P
Yellin, S
Yoo, J
Young, BA
Zhang, J
AF Ahmed, Z.
Akerib, D. S.
Arrenberg, S.
Bailey, C. N.
Balakishiyeva, D.
Baudis, L.
Bauer, D. A.
Brink, P. L.
Bruch, T.
Bunker, R.
Cabrera, B.
Caldwell, D. O.
Cooley, J.
Cushman, P.
Daal, M.
DeJongh, F.
Dragowsky, M. R.
Duong, L.
Fallows, S.
Figueroa-Feliciano, E.
Filippini, J.
Fritts, M.
Golwala, S. R.
Grant, D. R.
Hall, J.
Hennings-Yeomans, R.
Hertel, S. A.
Holmgren, D.
Hsu, L.
Huber, M. E.
Kamaev, O.
Kiveni, M.
Kos, M.
Leman, S. W.
Mahapatra, R.
Mandic, V.
McCarthy, K. A.
Mirabolfathi, N.
Moore, D.
Nelson, H.
Ogburn, R. W.
Phipps, A.
Pyle, M.
Qiu, X.
Ramberg, E.
Rau, W.
Reisetter, A.
Saab, T.
Sadoulet, B.
Sander, J.
Schnee, R. W.
Seitz, D. N.
Serfass, B.
Sundqvist, K. M.
Tarka, M.
Wikus, P.
Yellin, S.
Yoo, J.
Young, B. A.
Zhang, J.
CA CDMS II Collaboration
TI Dark Matter Search Results from the CDMS II Experiment
SO SCIENCE
LA English
DT Article
ID CONSTRAINTS; CANDIDATES
AB Astrophysical observations indicate that dark matter constitutes most of the mass in our universe, but its nature remains unknown. Over the past decade, the Cryogenic Dark Matter Search (CDMS II) experiment has provided world-leading sensitivity for the direct detection of weakly interacting massive particle (WIMP) dark matter. The final exposure of our low-temperature germanium particle detectors at the Soudan Underground Laboratory yielded two candidate events, with an expected background of 0.9 +/- 0.2 events. This is not statistically significant evidence for a WIMP signal. The combined CDMS II data place the strongest constraints on the WIMP-nucleon spin-independent scattering cross section for a wide range of WIMP masses and exclude new parameter space in inelastic dark matter models.
C1 [Cooley, J.] So Methodist Univ, Dept Phys, Dallas, TX 75275 USA.
[Ahmed, Z.; Filippini, J.; Golwala, S. R.; Moore, D.] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA.
[Akerib, D. S.; Bailey, C. N.; Dragowsky, M. R.; Grant, D. R.; Hennings-Yeomans, R.] Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA.
[Bauer, D. A.; DeJongh, F.; Hall, J.; Holmgren, D.; Hsu, L.; Ramberg, E.; Yoo, J.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Sadoulet, B.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Hertel, S. A.; Leman, S. W.; McCarthy, K. A.; Wikus, P.] MIT, Dept Phys, Cambridge, MA 02139 USA.
[Rau, W.] Queens Univ, Dept Phys, Kingston, ON K7L 3N6, Canada.
[Reisetter, A.] St Olaf Coll, Dept Phys, Northfield, MN 55057 USA.
[Young, B. A.] Santa Clara Univ, Dept Phys, Santa Clara, CA 95053 USA.
[Brink, P. L.; Cabrera, B.; Ogburn, R. W.; Pyle, M.; Yellin, S.] Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
[Kiveni, M.; Kos, M.; Schnee, R. W.] Syracuse Univ, Dept Phys, Syracuse, NY 13244 USA.
[Mahapatra, R.] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA.
[Daal, M.; Mirabolfathi, N.; Phipps, A.; Sadoulet, B.; Seitz, D. N.; Serfass, B.; Sundqvist, K. M.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Bunker, R.; Caldwell, D. O.; Nelson, H.; Yellin, S.] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA.
[Huber, M. E.] Univ Colorado, Dept Phys, Denver, CO 80217 USA.
[Huber, M. E.] Univ Colorado, Dept Elect Engn, Denver, CO 80217 USA.
[Balakishiyeva, D.; Saab, T.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA.
[Cushman, P.; Duong, L.; Fallows, S.; Fritts, M.; Kamaev, O.; Mandic, V.; Qiu, X.; Reisetter, A.; Zhang, J.] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA.
[Arrenberg, S.; Baudis, L.; Bruch, T.; Tarka, M.] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland.
RP Cooley, J (reprint author), So Methodist Univ, Dept Phys, Dallas, TX 75275 USA.
EM cooley@physics.smu.edu
RI Bailey, Catherine/C-6107-2009; Huber, Martin/B-3354-2011; Qiu,
Xinjie/C-6164-2012; Hall, Jeter/F-6108-2013; Hall, Jeter/E-9294-2015;
Yoo, Jonghee/K-8394-2016; Pyle, Matt/E-7348-2015;
OI Pyle, Matt/0000-0002-3490-6754; Holmgren, Donald/0000-0001-6701-7737;
Bunker, Raymond/0000-0003-2174-7632
FU National Science Foundation [AST-9978911, PHY-0542066, PHY-0503729,
PHY-0503629, PHY-0503641, PHY-0504224, PHY-0705052, PHY-0801708,
PHY-0801712, HY-0802575, PHY-0855525]; Department of Energy
[DE-AC03-76SF00098, DE-FG02-91ER40688, DE-FG02-92ER40701,
DE-FG03-90ER40569, DE-FG03-91ER40618]; Swiss National Foundation
[20-118119]; Natural Sciences and Engineering Research Council of Canada
[SAPIN 341314-07]
FX The CDMS collaboration gratefully acknowledges the contributions of
numerous engineers and technicians; we would like to especially thank J.
Beaty, B. Hines, L. Novak, R. Schmitt, and A. Tomada. This work is
supported in part by the National Science Foundation ( grants
AST-9978911, PHY-0542066, PHY-0503729, PHY-0503629, PHY-0503641,
PHY-0504224, PHY-0705052, PHY-0801708, PHY-0801712, PHY-0802575, and
PHY-0855525), by the Department of Energy ( contracts DE-AC03-76SF00098,
DE-FG02-91ER40688, DE-FG02-92ER40701, DE-FG03-90ER40569, and
DE-FG03-91ER40618), by the Swiss National Foundation ( SNF grant
20-118119), and by the Natural Sciences and Engineering Research Council
of Canada ( grant SAPIN 341314-07).
NR 18
TC 555
Z9 560
U1 20
U2 49
PU AMER ASSOC ADVANCEMENT SCIENCE
PI WASHINGTON
PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA
SN 0036-8075
J9 SCIENCE
JI Science
PD MAR 26
PY 2010
VL 327
IS 5973
BP 1619
EP 1621
DI 10.1126/science.1186112
PG 3
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 574ED
UT WOS:000275970600036
ER
PT J
AU Bai, XM
Voter, AF
Hoagland, RG
Nastasi, M
Uberuaga, BP
AF Bai, Xian-Ming
Voter, Arthur F.
Hoagland, Richard G.
Nastasi, Michael
Uberuaga, Blas P.
TI Efficient Annealing of Radiation Damage Near Grain Boundaries via
Interstitial Emission
SO SCIENCE
LA English
DT Article
ID IRON; IRRADIATION; COPPER; MICROSTRUCTURE; SIMULATION; CLUSTERS;
DYNAMICS; DEFECTS; METALS
AB Although grain boundaries can serve as effective sinks for radiation-induced defects such as interstitials and vacancies, the atomistic mechanisms leading to this enhanced tolerance are still not well understood. With the use of three atomistic simulation methods, we investigated defect-grain boundary interaction mechanisms in copper from picosecond to microsecond time scales. We found that grain boundaries have a surprising "loading-unloading" effect. Upon irradiation, interstitials are loaded into the boundary, which then acts as a source, emitting interstitials to annihilate vacancies in the bulk. This unexpected recombination mechanism has a much lower energy barrier than conventional vacancy diffusion and is efficient for annihilating immobile vacancies in the nearby bulk, resulting in self-healing of the radiation-induced damage.
C1 [Bai, Xian-Ming; Hoagland, Richard G.; Uberuaga, Blas P.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
[Voter, Arthur F.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Nastasi, Michael] Los Alamos Natl Lab, MPA CINT, Mat Phys & Applicat Div, Los Alamos, NM 87545 USA.
RP Uberuaga, BP (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, MST 8, Los Alamos, NM 87545 USA.
EM blas@lanl.gov
RI Hoagland, Richard/G-9821-2012; Bai, Xianming/E-2376-2017
OI Bai, Xianming/0000-0002-4609-6576
FU Laboratory Directed Research and Development program at Los Alamos
National Laboratory [20090061DR]; U.S. Department of Energy, Office of
Science, Office of Basic Energy Sciences [2008LANL1026]
FX We thank K. E. Sickafus, X. Y. Liu, C. W. Pao, S. Jindal, M. J.
Demkowicz, J. Wang, and S. M. Valone for helpful discussions. This work
was primarily sponsored by the Laboratory Directed Research and
Development program at Los Alamos National Laboratory under project
number 20090061DR. The TAD simulations on the asymmetric boundary were
supported as part of the Center for Materials at Irradiation and
Mechanical Extremes, an Energy Frontier Research Center funded by the
U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences under award number 2008LANL1026.
NR 28
TC 349
Z9 357
U1 22
U2 198
PU AMER ASSOC ADVANCEMENT SCIENCE
PI WASHINGTON
PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA
SN 0036-8075
J9 SCIENCE
JI Science
PD MAR 26
PY 2010
VL 327
IS 5973
BP 1631
EP 1634
DI 10.1126/science.1183723
PG 4
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 574ED
UT WOS:000275970600040
PM 20339070
ER
PT J
AU Maki, KL
Braun, RJ
Ucciferro, P
Henshaw, WD
King-Smith, PE
AF Maki, K. L.
Braun, R. J.
Ucciferro, P.
Henshaw, W. D.
King-Smith, P. E.
TI Tear film dynamics on an eye-shaped domain. Part 2. Flux boundary
conditions
SO JOURNAL OF FLUID MECHANICS
LA English
DT Article
ID PARTIAL-DIFFERENTIAL-EQUATIONS; DRY EYE; SURFACE-TENSION; OCULAR
SURFACE; LIQUID-FILM; LIPID LAYER; BLINK CYCLE; PRECORNEAL; THICKNESS;
DRAINAGE
AB We model the dynamics of the human tear film during relaxation (after a blink) using lubrication theory and explore the effects of viscosity, surface tension, gravity and boundary conditions that specify the flux of tear fluid into or out of the domain. The governing nonlinear partial differential equation is solved on an overset grid by a method of lines using finite differences in space and an adaptive second-order backward difference formula solver in time. Our simulations in a two-dimensional domain are computed in the OVERTURE computational framework. The flow around the boundary is sensitive to both our choice of flux boundary condition and the presence of gravity. The simulations recover features seen in one-dimensional simulations and capture some experimental observations of tear film dynamics around the lid margins. In some instances, the influx from the lacrimal gland splits with some fluid going along the upper lid towards the nasal canthus and some travelling around the temporal canthus and then along the lower lid. Tear supply can also push through some parts of the black line near the eyelid margins.
C1 [Maki, K. L.; Braun, R. J.; Ucciferro, P.] Univ Delaware, Dept Math Sci, Newark, DE 19711 USA.
[Henshaw, W. D.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
[King-Smith, P. E.] Ohio State Univ, Coll Optometry, Columbus, OH 43218 USA.
RP Braun, RJ (reprint author), Univ Delaware, Dept Math Sci, Newark, DE 19711 USA.
EM braun@math.udel.edu
NR 57
TC 24
Z9 24
U1 2
U2 19
PU CAMBRIDGE UNIV PRESS
PI NEW YORK
PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA
SN 0022-1120
J9 J FLUID MECH
JI J. Fluid Mech.
PD MAR 25
PY 2010
VL 647
BP 361
EP 390
DI 10.1017/S002211200999382X
PG 30
WC Mechanics; Physics, Fluids & Plasmas
SC Mechanics; Physics
GA 584YE
UT WOS:000276789600020
ER
PT J
AU Rodriguez, JA
Liu, P
Perez, M
Liu, G
Hrbek, J
AF Rodriguez, Jose A.
Liu, Ping
Perez, Manuel
Liu, Gang
Hrbek, Jan
TI Destruction of SO2 on An and Cu Nanoparticles Dispersed on MgO(100) and
CeO2(111)
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID GAS SHIFT REACTION; DEFINED GOLD PARTICLES; CO OXIDATION REACTION;
SULFUR-DIOXIDE; ELECTRONIC-PROPERTIES; AU NANOPARTICLES; METAL-OXIDES;
ADSORPTION; CATALYSTS; SURFACES
AB When going from periodic surfaces to isolated Clusters or nanoparticles, there is a big increase in the reactivity of Au and Cu toward SO2. Density functional calculations indicate that the enhancement in the SO2 adsorption energy is clue to the presence of corner sites (i.e., metal atoms with a low coordination number) and the fluxionality of the nanoparticles. Therefore, small Au particles bind SO2 stronger than a periodic Au(100) surface. However, the S <-> Au and O <-> Au interactions are not strong enough to induce the rupture of the S-O bonds. In contrast, the dissociation of SO2 on Cu particles is a very exothermic process, even more exothermic than on a periodic Cu(100.) surface. Experiments of synchrotron-based high-resolution photoemission and X-ray absorption spectroscopy show big differences ill the DeSOx activity of Au and Cu nanoparticles dispersed on MgO(100) and CeO2(111). The heat of adsorption of the SO2 on Au nanoparticles supported on MgO(100) or CeO2(111) was 0.2 to 0.4 eV larger than on Au(100) with negligible dissociation of the molecule. The full decomposition of SO2 was observed on after O vacancies were introduced ill the ceria Support. The O vacancies in ceria either played I direct role ill the dissociation of SO2 (cracking, of the molecule at the oxide-metal interface) or enhanced the Chemical activity of the supported Au nanoparticles. The addition of Cu particles to MgO(100) or CeO2(111) generates systems that are extremely active for the destruction of SO2. At 100-150 K, the SO2 adsorbs molecularly on the supported Cu particles. Heating to temperatures above 200 K leads to massive dissociation of the SO2. A comparison of the behavior of SO2 on Cu/MgO(100) and Cu/CeO2-x(111) shows how important the reducibility of the oxide support in DeSOx operations can be.
C1 [Rodriguez, Jose A.; Liu, Ping; Liu, Gang; Hrbek, Jan] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
[Perez, Manuel] Cent Univ Venezuela, Fac Ciencias, Caracas, Venezuela.
RP Rodriguez, JA (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
EM rodrigez@bnl.gov
RI Hrbek, Jan/I-1020-2013
FU U.S. Department of Energy [DE-AC02-98CH10886]; INTEVEP; ENRI
FX We arc grateful to T. Jirsak and J. Evans for their help with some of
the photoemission experiments and for thought-provoking conversations on
the behavior of gold/ oxide and copper/oxide interfaces. The research
carried Out at Brookhaven National Laboratory was supported by the U.S.
Department of Energy (Chemical Sciences Division, DE-AC02-98CH10886).
The National Synchrotron Light Source is supported by the Divisions of
Chemical and Materials Science of the U.S. Department of Energy. M.P.
thanks INTEVEP and ENRI for research grants that made part of this work
possible.
NR 78
TC 21
Z9 22
U1 1
U2 28
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1089-5639
J9 J PHYS CHEM A
JI J. Phys. Chem. A
PD MAR 25
PY 2010
VL 114
IS 11
BP 3802
EP 3810
DI 10.1021/jp905761s
PG 9
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 570WA
UT WOS:000275707800010
PM 19634883
ER
PT J
AU Liu, P
Choi, Y
Yang, YX
White, MG
AF Liu, Ping
Choi, YongMan
Yang, Yixiong
White, Michael G.
TI Methanol Synthesis from H-2 and CO2 on a Mo6S8 Cluster: A Density
Functional Study
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID GAS SHIFT REACTION; AB-INITIO; HETEROGENEOUS CATALYSIS; MAGIC CLUSTERS;
CHEVREL PHASES; MOLYBDENUM; ETHANOL; SURFACE; WATER; MO
AB Catalytic CO2 hydrogenation to methanol has received considerable attention its all effective Way to utilize CO2. In this paper, density functional theory was employed to investigate the methanol synthesis from CO, and H-2 on a Mo6S8 cluster. The Mo6S8 cluster is the structural building block of the Chevrel phase of molybdenum sulfide, and has a cagelike structure With all octahedral Mo-6 metallic core. Our calculations indicate that the preferred catalytic pathway for methanol synthesis on the Mo6S8 Cluster is very different from that of bulklike MoS2, MoS2 promotes the C-O scission of HxCO intermediated, and therefore, only hydrocarbons are produced. The lower S/Mo ratio for the cluster compared to stoichiometric MoS2 might be expected to lead to higher activity because more low-coordinated Mo sites are available for reaction. However, our results show that the Mo6S8 cluster is not as reactive as bulk MoS2 because it is unable to break the C-O bond of HxCO intermediates and therefore cannot produce hydrocarbons. Yet, the Mo6S8 cluster is predicted to have moderate activity for converting CO2 and H-2 to methanol. The overall reaction pathway involves the reverse water-gas shift reaction (CO2 + H-2 -> CO + H2O), followed by CO hydrogenation via HCO (CO + 2H(2) -> CH3OH) to form methanol. The rate-limiting step is CO hydrogenation to the HCO with a calculated barrier of +1 eV. This barrier is much lower than that calculated for a comparably sized Cu nanoparticle. which is the prototypical metal catalyst used for methanol synthesis from syngas (CO + H-2). Both the Mo and S sites participate in the reaction with CO2, CO. and CHxO preferentially binding to the Mo sites, whereas S atoms facilitate bond cleavage by forming relatively Strong S-H bonds. Our study reveals that the unexpected activity of the Mo6S8 cluster is the result of the interplay between shifts ill the Mo cl-band and S p-band and its unique cagelike geometry.
C1 [Liu, Ping; Choi, YongMan; White, Michael G.] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
[Yang, Yixiong; White, Michael G.] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA.
RP Liu, P (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
EM pingliu3@bnl.gov
RI Choi, YongMan/N-3559-2014
OI Choi, YongMan/0000-0003-4276-1599
FU U.S. Department of Energy [DE-AC02-98CH10886, DE-AC02-05CH11231]
FX This research was carried out at Brookhaven National Laboratory under
Contract DE-AC02-98CH10886 with the U.S. Department of Energy, Division
of Chemical Sciences. The DFT calculations were carried out at Centers
for Functional Nanomaterials at Brookhaven National Laboratory and the
National Energy Research Scientific Computing (NERSC) Center, which is
supported by the Office of Science of the U.S. Department of Energy
under Contract no. DE-AC02-05CH11231.
NR 53
TC 28
Z9 28
U1 6
U2 74
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1089-5639
J9 J PHYS CHEM A
JI J. Phys. Chem. A
PD MAR 25
PY 2010
VL 114
IS 11
BP 3888
EP 3895
DI 10.1021/jp906780a
PG 8
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 570WA
UT WOS:000275707800020
PM 19877650
ER
PT J
AU Sushko, ML
Liu, J
AF Sushko, Maria L.
Liu, Jun
TI Structural Rearrangements in Self-Assembled Surfactant Layers at
Surfaces
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID DENSITY-FUNCTIONAL THEORY; INHOMOGENEOUS POLYMER SYSTEMS; NONUNIFORM
POLYATOMIC SYSTEMS; AMPHIPHILIC BINARY-MIXTURES; DIBLOCK COPOLYMER
FILMS; SOLID-LIQUID INTERFACE; MEAN SPHERICAL MODEL; BLOCK-COPOLYMERS;
THIN-FILMS; MONOLAYER FILMS
AB The transition from compact to extended configuration in ionic surfactant layers under the influence of salt, surfactant surface density, and temperature is studied Using the classical density functional theory (cDF-T). The increase in ionic strength of in aqueous Salt solution or in the surfactant surface density leads to the transition from the hemicylindrical to the perpendicular monolayer configuration of the molecules. Although producing the same structural rearrangement in the surfactant layer, the origin of the effect of salt and surface density is different. While the addition of salt increases the out-of-plane attractive interactions with the solvent., the increase in density results in the increase in the in-plane repulsion in the surfactant layer. The temperature effects are subtler and are mainly manifested in the reduction of the solution structuring at elevated temperatures.
C1 [Sushko, Maria L.; Liu, Jun] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Sushko, ML (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA.
EM maria.sushko@pnl.gov
RI Sushko, Maria/C-8285-2014
OI Sushko, Maria/0000-0002-7229-7072
FU U.S. Department of Energy, Office of Basic Energy Sciences, Division of
Materials Sciences and Engineering [KC020105-FWP12152]; DOE
[DE-AC05-76RL01830]
FX The study of surfactant self-assembly at surfaces is supported by the
U.S. Department of Energy, Office of Basic Energy Sciences, Division of
Materials Sciences and Engineering under Award KC020105-FWP12152. PNNL
is a multiprograrn national laboratory operated for DOE by Battelle
under contract DE-AC05-76RL01830.
NR 69
TC 8
Z9 8
U1 0
U2 7
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1520-6106
J9 J PHYS CHEM B
JI J. Phys. Chem. B
PD MAR 25
PY 2010
VL 114
IS 11
BP 3847
EP 3854
PG 8
WC Chemistry, Physical
SC Chemistry
GA 570WY
UT WOS:000275710400015
PM 20184303
ER
PT J
AU Walker, BN
Stolee, JA
Pickel, DL
Retterer, ST
Vertes, A
AF Walker, Bennett N.
Stolee, Jessica A.
Pickel, Deanna L.
Retterer, Scott T.
Vertes, Akos
TI Tailored Silicon Nanopost Arrays for Resonant Nanophotonic Ion
Production
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID FIELD ENHANCEMENT; OPTICAL ANTENNAS; LASER DESORPTION/IONIZATION;
INDUCED DISSOCIATION; MICROCOLUMN ARRAYS; MASS-SPECTROMETRY;
FEMTOSECOND; NANOSTRUCTURES; FRAGMENTATION; MICROSCOPY
AB Nanostructures that have dimensions Commensurate with the wavelength of the electromagnetic radiation exhibit near-field effects and, as optical antennas, can Couple laser radiation to the local environment. Laser-induced silicon microcolumn arrays behave as nanophotonic ion sources that can be modulated by rotating the plane of light polarization. However, the limited range Of Surface morphologies available for these Substrates makes it difficult to study the underlying mechanism that governs ion production. Here we demonstrate that nanopost arrays (NAPAs) can be tailored to exhibit resonant ion production. Ion yields from posts with subwavelength diameter show sharp resonances at high aspect ratios. The resonant enhancement in ion intensities can be modulated by adjusting, the periodicity. In addition to strong molecular ion formation, the presence of high-energy fragmentation channels is observed. Ion yields From NAPAs exhibit dramatic differences for p- and s-polarized laser beams. indicating that energy coupling is Similar 10 antenna arrays. These nanophotonic ion sources can Control the degree of ion fragmentation and could eventually be integrated with micromachined mass spectrometers and microfluidic devices.
C1 [Walker, Bennett N.; Stolee, Jessica A.; Vertes, Akos] George Washington Univ, Dept Chem, Washington, DC 20052 USA.
[Pickel, Deanna L.; Retterer, Scott T.] Oak Ridge Natl Lab, Mat Sci & Biosci Div, Oak Ridge, TN 37831 USA.
RP Vertes, A (reprint author), 725 21st St NW, Washington, DC 20052 USA.
EM vertes@gwu.edu
RI Walker, Bennett/G-5001-2010; Retterer, Scott/A-5256-2011; Pickel,
Deanna/E-4778-2010; Vertes, Akos/B-7159-2008;
OI Retterer, Scott/0000-0001-8534-1979; Vertes, Akos/0000-0001-5186-5352;
WALKER, BENNETT/0000-0003-0221-1904
FU U.S. Department of Energy [DE-FG02-01ER15129]; Protea Biosciences, Inc.;
Achievement Rewards for College Scientists Foundation, Inc. (ARCS)
FX Financial support by the Chemical Sciences, Geosciences and Biosciences
Division within the Office of Basic Energy Sciences of the U.S.
Department of Energy (DE-FG02-01ER15129) and from Protea Biosciences,
Inc. is acknowledged. B.N.W. and J.A.S. are grateful for the scholarship
award from the Achievement Rewards for College Scientists Foundation,
Inc. (ARCS). The NAPA structures Were nanofabricated, and a portion of
the mass spectrometry data was obtained in the framework of a User
Agreement (CNMS2008-249) at Oak Ridge National Laboratory's Center for
Nanophase Materials Sciences, sponsored by the Scientific User
Facilities Division, Office of Basic Energy Sciences, U.S. Department of
Energy.
NR 32
TC 35
Z9 35
U1 5
U2 34
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD MAR 25
PY 2010
VL 114
IS 11
BP 4835
EP 4840
DI 10.1021/jp9110103
PG 6
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 570WH
UT WOS:000275708600011
ER
PT J
AU Starodub, E
Bartelt, NC
McCarty, KF
AF Starodub, Elena
Bartelt, Norman C.
McCarty, Kevin F.
TI Oxidation of Graphene on Metals
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID SURFACE; GROWTH; ADSORPTION; GRAPHITE; RU(0001); KINETICS; OXYGEN; CO
AB We Use low-energy electron microscopy to investigate how graphene is removed from Ru(0001) and Ir(111) by reaction with oxygen. We find two mechanisms on Ru(0001). At short times, oxygen reacts with carbon monomers on the surrounding Ru surface, decreasing their concentration below the equilibrium value. This undersaturation causes a flux of carbon from graphene to the monomer gas. In this initial mechanism. graphene is etched at a rate that is given precisely by the same nonlinear dependence oil carbon monomer concentration that governs growth. Thus, during both growth and etching, carbon attaches and detaches to graphene as clusters of several carbon atoms. At later times, etching accelerates. We present evidence that this process involves intercalated oxygen, which destabilizes graphene. On Ir, this mechanism creates observable holes. It also occurs Mostly quickly near wrinkles in the graphene islands, depends oil the orientation of the graphene with respect to the Ir substrate, and, in contrast to the first mechanism, call Increase the density of carbon monomers. We also observe that both layers of bilayer graphene islands oil Ir etch together, not sequentially.
C1 [Starodub, Elena; Bartelt, Norman C.; McCarty, Kevin F.] Sandia Natl Labs, Livermore, CA 94550 USA.
RP Starodub, E (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA.
EM estarod@sandia.gov; mccarty@sandia.gov
RI McCarty, Kevin/F-9368-2012; Bartelt, Norman/G-2927-2012
OI McCarty, Kevin/0000-0002-8601-079X;
FU Office of Basic Energy Sciences, Division of Materials Sciences and
Engineering a of the US DOE [DE-AC04-94AL85000]
FX The authors acknowledge with pleasure a valuable discussion with Alex
Chernov (LLNL) about mechanisms of crystal growth and etching. This work
was supported by the Office of Basic Energy Sciences, Division of
Materials Sciences and Engineering a of the US DOE under Contract No.
DE-AC04-94AL85000.
NR 26
TC 57
Z9 57
U1 3
U2 65
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD MAR 25
PY 2010
VL 114
IS 11
BP 5134
EP 5140
DI 10.1021/jp912139e
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 570WH
UT WOS:000275708600051
ER
PT J
AU Newhouse, RJ
Stavila, V
Hwang, SJ
Klebanoff, LE
Zhang, JZ
AF Newhouse, Rebecca J.
Stavila, Vitalie
Hwang, Son-Jong
Klebanoff, Leonard E.
Zhang, Jin Z.
TI Reversibility and Improved Hydrogen Release of Magnesium Borohydride
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID SOLID-STATE NMR; WELL-CRYSTALLIZED MG(BH4)(2); METAL-BOROHYDRIDES;
STORAGE MATERIALS; TI; SYSTEM; TETRAHYDROBORATE; DECOMPOSITION;
NANOPARTICLES; LISC(BH4)(4)
AB Desorption and subsequent rehydrogenation of Mg(BH4)(2) with and without 5 mol % TiF3 and ScCl3 have been investigated. Temperature programmed desorption (TPD) experiments revealed a significant increase ill the rate of desorption as well as the weight percentage of hydrogen released with additives Upon heating to 300 degrees C. Stable Mg(BxHy)(u) intermediates were formed at 300 degrees C, whereas MgB2 was the major product when heated to 600 degrees C. These samples were then rehydrogenated and subsequently characterized with powder X-ray diffraction (IARD), Raman, and NMR spectroscopy. We confirmed significant conversion of MgB2 to fully hydrogenated Mg(BH4)(2) for the sample with and without additives. TPD and NMR studies revealed that the additives have a significant effect on the reaction pathway during both dehydrogenation and rehydrogenation actions. This work suggests that the use of additives may provide a valid pathway for improving intrinsic hydrogen storage properties of magnesium borohydride.
C1 [Newhouse, Rebecca J.; Stavila, Vitalie; Klebanoff, Leonard E.] Sandia Natl Labs, Livermore, CA 94551 USA.
[Newhouse, Rebecca J.; Zhang, Jin Z.] Univ Calif Santa Cruz, Dept Chem & Biochem, Santa Cruz, CA 95064 USA.
[Hwang, Son-Jong] CALTECH, Div Chem & Chem Engn, Pasadena, CA 91125 USA.
RP Stavila, V (reprint author), Sandia Natl Labs, Livermore, CA 94551 USA.
EM vnstavi@sandia.gov
RI Stavila, Vitalie/F-4188-2010; Stavila, Vitalie/B-6464-2008
OI Stavila, Vitalie/0000-0003-0981-0432
FU U.S. Department of Energy, Office of Energy Efficiency and Renewable
Energy [DE-AC04-94AL85000, DE-AI-01-05EE11104, DE-AI-01-05EE11105];
National Science Foundation (NSF) [9724240, DMR-0520565]; Basic Energy
Sciences (BES) Division of the US Department of Energy (DOE)
[DE-FG02-06ER46251]
FX The authors would like to thank George Sartor, Ken Stewart, and Jeff
Chames for their skillful technical assistance. Assistance in sample
handling by Joseph Reiter at JPL and David Abrecht at Caltech are
greatly appreciated. We would also like to thank Craig Jensen, Ewa
R[cid:image001.png@01CAED3A.CB807540]nnebro, Joe Cordaro, and Mitch
Anstey for helpful discussions. We gratefully acknowledge financial
support from the U.S. Department of Energy, Office of Energy Efficiency
and Renewable Energy, in the Hydrogen, Fuel Cells & Infrastructure
Technologies Program under Contract Nos. DE-AC04-94AL85000,
DE-AI-01-05EE11104, and DE-AI-01-05EE11105. The NMR facility at Caltech
was supported by the National Science Foundation (NSF) under Grant
Number 9724240 and partially supported by the MRSEC Program of the NSF
under Award Number DMR-0520565. JZZ is grateful to support by the Basic
Energy Sciences (BES) Division of the US Department of Energy (DOE)
(DE-FG02-06ER46251).
NR 54
TC 82
Z9 84
U1 7
U2 53
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
J9 J PHYS CHEM C
JI J. Phys. Chem. C
PD MAR 25
PY 2010
VL 114
IS 11
BP 5224
EP 5232
DI 10.1021/jp9116744
PG 9
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 570WH
UT WOS:000275708600065
ER
PT J
AU Figueiredo, RB
Beyerlein, IJ
Zhilyaev, AP
Langdon, TG
AF Figueiredo, Roberto B.
Beyerlein, Irene J.
Zhilyaev, Alexander P.
Langdon, Terence G.
TI Evolution of texture in a magnesium alloy processed by ECAP through dies
with different angles
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Equal-channel angular pressing; Magnesium alloys; Slip systems; Texture;
Visco-plastic self-consistent simulations
ID CHANNEL ANGULAR EXTRUSION; CRYSTALLOGRAPHIC TEXTURE; DUCTILITY
ENHANCEMENT; MECHANICAL-PROPERTIES; ROOM-TEMPERATURE; DEFORMATION;
COPPER; MICROSTRUCTURE; ROUTE; SLIP
AB A fine-grained magnesium ZK60 alloy was used to study texture evolution during processing by equal-channel angular pressing. Experiments were conducted by pressing the alloy through dies having angles of 90 degrees, 110 degrees and 135 degrees and the textures were predicted using a visco-plastic self-consistent model. It is shown that the development of texture depends upon the channel angle within the die. Calculations indicate that, after basal < a > slip, there is significant prismatic < a > slip and pyramidal < a > slip activity during ECAP in all cases. This is a unique result attributed to the fine grain size and severe plastic deformation. The simulations also reveal evidence of geometrical softening in the first stage of deformation when using dies having channel angles of 90 degrees and 110 degrees. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Figueiredo, Roberto B.; Langdon, Terence G.] Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA.
[Figueiredo, Roberto B.; Langdon, Terence G.] Univ So Calif, Dept Mat Sci, Los Angeles, CA 90089 USA.
[Beyerlein, Irene J.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Zhilyaev, Alexander P.] CSIC, CENIM, E-28040 Madrid, Spain.
[Zhilyaev, Alexander P.] Russian Acad Sci, Inst Met Superplast Problems, Ufa 450001, Russia.
[Langdon, Terence G.] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England.
RP Langdon, TG (reprint author), Univ So Calif, Dept Aerosp & Mech Engn, Los Angeles, CA 90089 USA.
EM langdon@usc.edu
RI Langdon, Terence/B-1487-2008; Zhilyaev, Alexander/E-5624-2010;
Figueiredo, Roberto/F-3451-2012; Beyerlein, Irene/A-4676-2011;
OI Zhilyaev, Alexander/0000-0002-1902-8703
FU CAPES/Fulbright Scholarship; Office of Basic Energy Science (DOE) [FWP
06SCPE401]; U.S. Army Research Office [W911NF-08-1-0201]
FX One of the authors (APZ) thanks Prof T.R. McNelley (Naval Postgraduate
School, Monterey, CA) for useful discussions and for support of the
experimental measurements of texture. This work was supported by a
CAPES/Fulbright Scholarship (RBF), the Office of Basic Energy Science
(DOE) through Project FWP 06SCPE401 (IJB) and the U.S. Army Research
Office under Grant No. W911NF-08-1-0201 (RBF and TGL).
NR 45
TC 19
Z9 23
U1 0
U2 13
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD MAR 25
PY 2010
VL 527
IS 7-8
BP 1709
EP 1718
DI 10.1016/j.msea.2009.10.061
PG 10
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 569YQ
UT WOS:000275639200008
ER
PT J
AU Zhao, YH
Zhan, Q
Topping, TD
Li, Y
Liu, W
Lavernia, EJ
AF Zhao, Y. H.
Zhan, Q.
Topping, T. D.
Li, Y.
Liu, W.
Lavernia, E. J.
TI Improving ductility in ultrafine grained nickel with porosity and
segregation via deformation
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Nanostructured Ni; Nano-porosity; Grain boundary segregation; Ductility;
Deformation
ID SEVERE PLASTIC-DEFORMATION; NANOSTRUCTURED MATERIALS; NANOCRYSTALLINE
NICKEL; TENSILE BEHAVIOR; BOUNDARY MOTION; STRENGTH; COPPER; IMPURITIES;
METALS; NI
AB When bulk nanostructured (NS) materials are prepared via consolidation of individual particles, agglomerates or clusters, extraneous defects, such as porosity, insufficient bonding, and impurities are sometimes introduced leading to the degradation of ductility. in this study we propose to examine the hypothesis that deformation can be used to ameliorate the negative effects of these artifacts on the ductility of NS alloys. The approach involved cryomilling and forging to synthesize bulk NS nickel with porosity (95.5% theoretical density) and nitrogen grain boundary (GB) segregation. The results demonstrate that cold rolling resulted in an increase in tensile ductility from 2 to similar to 4%, with a slight decrease in yield strength from 1150 to 1050 MPa. Microstructural analyses suggest that the elimination of nano-porosity together with the physical breakdown of a continuous nitrogen layer at GBs during cold rolling is possibly responsible for the observed ductility enhancement, and in the case of the latter phenomena, a corresponding decrease in strength also. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Zhao, Y. H.; Topping, T. D.; Li, Y.; Liu, W.; Lavernia, E. J.] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA.
[Zhan, Q.] Univ Sci & Technol Beijing, Dept Mat Phys & Chem, Beijing 100083, Peoples R China.
[Zhan, Q.] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
RP Zhao, YH (reprint author), Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA.
EM yhzhao@ucdavis.edu
RI Li, Ying/G-3908-2010; Zhao, Yonghao/A-8521-2009; Lavernia,
Enrique/I-6472-2013; Liu, Wei/A-9357-2016
OI Li, Ying/0000-0003-3738-9307; Lavernia, Enrique/0000-0003-2124-8964;
Liu, Wei/0000-0003-3016-7381
FU Office of Naval Research [N00014-08-1-0370]
FX Y.H. Zhao and E.J. Lavernia would like to acknowledge support by the
Office of Naval Research (Grant number N00014-08-1-0370) with Dr.
Lawrence Kabacoff as program officer.
NR 38
TC 5
Z9 5
U1 2
U2 13
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD MAR 25
PY 2010
VL 527
IS 7-8
BP 1744
EP 1750
DI 10.1016/j.msea.2009.10.064
PG 7
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 569YQ
UT WOS:000275639200012
ER
PT J
AU Bei, H
Yamamoto, Y
Brady, MP
Santella, ML
AF Bei, H.
Yamamoto, Y.
Brady, M. P.
Santella, M. L.
TI Aging effects on the mechanical properties of alumina-forming austenitic
stainless steels
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Mechanical characterization; Aging; Intermetallics; Steel; Fracture
ID COAL POWER-PLANTS; CREEP-RESISTANT; SCALE FORMATION; MICROSTRUCTURES;
TEMPERATURE; ADDITIONS; ALLOY; PRECIPITATION; BEHAVIOR; PHASE
AB Isothermal aging and tensile evaluation were conducted for recently developed alumina-forming austenitic stainless steels (AFAs). Microstructural observation reveals that NiAl-type B2 and F(e)2(Mo,Nb)type Laves phase precipitates form as dominant second phases in the austenitic matrix during aging at 750 degrees C. At room temperature these precipitates increase the strength but decrease the ductility of the AFA alloys. However, when tested at 750 degrees C, the AFA alloys did not show strong precipitation hardening by these phases, moreover, the elongation to fracture was not affected by aging. Fracture surface and cross-sectional microstructure analysis after tensile testing suggests that the difference of mechanical behaviors between room temperature and 750 degrees C results from the ductile-brittle transition of the B2 precipitates. At room temperature, B2 precipitates are strong but brittle, whereas they become weak but ductile above the ductile-brittle transition temperature (DBTT). (C) 2009 Elsevier B.V. All rights reserved.
C1 [Bei, H.; Yamamoto, Y.; Brady, M. P.; Santella, M. L.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
RP Bei, H (reprint author), Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
EM BeiH@ornl.gov; Bradymp@ornl.gov
RI Brady, Michael/A-8122-2008;
OI Brady, Michael/0000-0003-1338-4747; Bei, Hongbin/0000-0003-0283-7990
FU United States Department of Energy (USDOE) Fossil Energy
[DE-AC05-00OR22725]
FX The authors thank Drs. A. Gali and L. Tan in ORNL for reviewing this
manuscript. This work was funded by the United States Department of
Energy (USDOE) Fossil Energy Advanced Research Materials program. The
Oak Ridge National Laboratory is managed by UT-Battelle, LLC (Oak Ridge,
TN), for the USDOE under Contract No. DE-AC05-00OR22725. The authors
also acknowledge the SHaRE User Facility at the Oak Ridge National
Laboratory, sponsored by the USDOE Office of Basic Energy Sciences,
Division of Scientific User Facilities.
NR 27
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U1 2
U2 19
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD MAR 25
PY 2010
VL 527
IS 7-8
BP 2079
EP 2086
DI 10.1016/j.msea.2009.11.052
PG 8
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 569YQ
UT WOS:000275639200059
ER
PT J
AU Krivanek, OL
Chisholm, MF
Nicolosi, V
Pennycook, TJ
Corbin, GJ
Dellby, N
Murfitt, MF
Own, CS
Szilagyi, ZS
Oxley, MP
Pantelides, ST
Pennycook, SJ
AF Krivanek, Ondrej L.
Chisholm, Matthew F.
Nicolosi, Valeria
Pennycook, Timothy J.
Corbin, George J.
Dellby, Niklas
Murfitt, Matthew F.
Own, Christopher S.
Szilagyi, Zoltan S.
Oxley, Mark P.
Pantelides, Sokrates T.
Pennycook, Stephen J.
TI Atom-by-atom structural and chemical analysis by annular dark-field
electron microscopy
SO NATURE
LA English
DT Article
ID SUB-ANGSTROM RESOLUTION; SINGLE ATOMS; GRAPHITE; NITROGEN; GRAPHENE;
CARBON; OXYGEN; BORON
AB Direct imaging and chemical identification of all the atoms in a material with unknown three-dimensional structure would constitute a very powerful general analysis tool. Transmission electron microscopy should in principle be able to fulfil this role, as many scientists including Feynman realized early on(1). It images matter with electrons that scatter strongly from individual atoms and whose wavelengths are about 50 times smaller than an atom. Recently the technique has advanced greatly owing to the introduction of aberration-corrected optics(2-8). However, neither electron microscopy nor any other experimental technique has yet been able to resolve and identify all the atoms in a non-periodic material consisting of several atomic species. Here we show that annular dark-field imaging in an aberration-corrected scanning transmission electron microscope optimized for low voltage operation can resolve and identify the chemical type of every atom in monolayer hexagonal boron nitride that contains substitutional defects. Three types of atomic substitutions were found and identified: carbon substituting for boron, carbon substituting for nitrogen, and oxygen substituting for nitrogen. The substitutions caused in-plane distortions in the boron nitride monolayer of about 0.1 angstrom magnitude, which were directly resolved, and verified by density functional theory calculations. The results demonstrate that atom-by-atom structural and chemical analysis of all radiation-damage-resistant atoms present in, and on top of, ultrathin sheets has now become possible.
C1 [Krivanek, Ondrej L.; Corbin, George J.; Dellby, Niklas; Murfitt, Matthew F.; Own, Christopher S.; Szilagyi, Zoltan S.] Nion Co, Kirkland, WA 98033 USA.
[Chisholm, Matthew F.; Pennycook, Timothy J.; Oxley, Mark P.; Pantelides, Sokrates T.; Pennycook, Stephen J.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Nicolosi, Valeria] Univ Oxford, Dept Mat, Oxford OX1 3PH, England.
[Pennycook, Timothy J.; Oxley, Mark P.; Pantelides, Sokrates T.; Pennycook, Stephen J.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA.
RP Krivanek, OL (reprint author), Nion Co, 1102 8th St, Kirkland, WA 98033 USA.
EM krivanek@nion.com
RI Pennycook, Timothy/B-4946-2014
OI Pennycook, Timothy/0000-0002-0008-6516
FU Division of Materials Sciences and Engineering of the US Department of
Energy [DE-FG02-09ER46554]; McMinn Endowment
FX We thank L. M. Brown, J.N. Coleman, P. Rez and J. C. H. Spence for
discussions. Research at Oak Ridge National Laboratory ( M. F. C., T. J.
P., M. P. O., S. T. P. and S. J. P.) was sponsored by the Division of
Materials Sciences and Engineering of the US Department of Energy.
Research at Vanderbilt was supported in part by the US Department of
Energy grant DE-FG02-09ER46554 and the McMinn Endowment. Computations
were performed at the National Energy Research Scientific Computing
Center at Lawrence Berkeley National Laboratory.
NR 28
TC 440
Z9 441
U1 28
U2 345
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 0028-0836
J9 NATURE
JI Nature
PD MAR 25
PY 2010
VL 464
IS 7288
BP 571
EP 574
DI 10.1038/nature08879
PG 4
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 574FL
UT WOS:000275974200043
PM 20336141
ER
PT J
AU Bond-Lamberty, B
Thomson, A
AF Bond-Lamberty, Ben
Thomson, Allison
TI Temperature-associated increases in the global soil respiration record
SO NATURE
LA English
DT Article
ID INTERANNUAL VARIABILITY; TERRESTRIAL ECOSYSTEMS; CLIMATE-CHANGE; CARBON;
BOREAL; CO2; SENSITIVITY; VEGETATION; DECOMPOSITION; DATABASE
AB Soil respiration, R(S), the flux of microbially and plant-respired carbon dioxide (CO(2)) from the soil surface to the atmosphere, is the second-largest terrestrial carbon flux(1-3). However, the dynamics of R(S) are not well understood and the global flux remains poorly constrained(4,5). Ecosystem warming experiments(6,7), modelling analyses(8,9) and fundamental biokinetics(10) all suggest that R(S) should change with climate. This has been difficult to confirm observationally because of the high spatial variability of R(S), inaccessibility of the soil medium and the inability of remote-sensing instruments to measure R(S) on large scales. Despite these constraints, it may be possible to discern climate-driven changes in regional or global R(S) values in the extant four-decade record of R(S) chamber measurements. Here we construct a database of worldwide R(S) observations matched with high-resolution historical climate data and find a previously unknown temporal trend in the R(S) record after accounting for mean annual climate, leaf area, nitrogen deposition and changes in CO(2) measurement technique. We find that the air temperature anomaly (the deviation from the 1961-1990 mean) is significantly and positively correlated with changes in R(S). We estimate that the global R(S) in 2008 (that is, the flux integrated over the Earth's land surface over 2008) was 98 +/- 12 Pg C and that it increased by 0.1 Pg C yr(-1) between 1989 and 2008, implying a global R(S) response to air temperature (Q(10)) of 1.5. An increasing global R(S) value does not necessarily constitute a positive feedback to the atmosphere, as it could be driven by higher carbon inputs to soil rather than by mobilization of stored older carbon. The available data are, however, consistent with an acceleration of the terrestrial carbon cycle in response to global climate change.
C1 [Bond-Lamberty, Ben; Thomson, Allison] Univ Maryland, Pacific NW Natl Lab, Joint Global Change Res Inst, College Pk, MD 20740 USA.
RP Bond-Lamberty, B (reprint author), Univ Maryland, Pacific NW Natl Lab, Joint Global Change Res Inst, 5825 Univ Res Court,Suite 3500, College Pk, MD 20740 USA.
EM bondlamberty@pnl.gov
RI Thomson, Allison/B-1254-2010; Bond-Lamberty, Ben/C-6058-2008
OI Bond-Lamberty, Ben/0000-0001-9525-4633
FU US Department of Energy Office of Science; Pacific Northwest National
Laboratory
FX This research was supported by the US Department of Energy Office of
Science and the Laboratory Directed Research and Development program of
the Pacific Northwest National Laboratory. It would not have been
possible without the thousands of researchers who measured and published
the data collected here. We thank B. Melchior for his assistance.
NR 30
TC 386
Z9 472
U1 38
U2 355
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 0028-0836
J9 NATURE
JI Nature
PD MAR 25
PY 2010
VL 464
IS 7288
BP 579
EP U132
DI 10.1038/nature08930
PG 5
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 574FL
UT WOS:000275974200045
PM 20336143
ER
PT J
AU Chapman, JA
Kirkness, EF
Simakov, O
Hampson, SE
Mitros, T
Weinmaier, T
Rattei, T
Balasubramanian, PG
Borman, J
Busam, D
Disbennett, K
Pfannkoch, C
Sumin, N
Sutton, GG
Viswanathan, LD
Walenz, B
Goodstein, DM
Hellsten, U
Kawashima, T
Prochnik, SE
Putnam, NH
Shu, SQ
Blumberg, B
Dana, CE
Gee, L
Kibler, DF
Law, L
Lindgens, D
Martinez, DE
Peng, JS
Wigge, PA
Bertulat, B
Guder, C
Nakamura, Y
Ozbek, S
Watanabe, H
Khalturin, K
Hemmrich, G
Franke, A
Augustin, R
Fraune, S
Hayakawa, E
Hayakawa, S
Hirose, M
Hwang, JS
Ikeo, K
Nishimiya-Fujisawa, C
Ogura, A
Takahashi, T
Steinmetz, PRH
Zhang, XM
Aufschnaiter, R
Eder, MK
Gorny, AK
Salvenmoser, W
Heimberg, AM
Wheeler, BM
Peterson, KJ
Boettger, A
Tischler, P
Wolf, A
Gojobori, T
Remington, KA
Strausberg, RL
Venter, JC
Technau, U
Hobmayer, B
Bosch, TCG
Holstein, TW
Fujisawa, T
Bode, HR
David, CN
Rokhsar, DS
Steele, RE
AF Chapman, Jarrod A.
Kirkness, Ewen F.
Simakov, Oleg
Hampson, Steven E.
Mitros, Therese
Weinmaier, Thomas
Rattei, Thomas
Balasubramanian, Prakash G.
Borman, Jon
Busam, Dana
Disbennett, Kathryn
Pfannkoch, Cynthia
Sumin, Nadezhda
Sutton, Granger G.
Viswanathan, Lakshmi Devi
Walenz, Brian
Goodstein, David M.
Hellsten, Uffe
Kawashima, Takeshi
Prochnik, Simon E.
Putnam, Nicholas H.
Shu, Shengquiang
Blumberg, Bruce
Dana, Catherine E.
Gee, Lydia
Kibler, Dennis F.
Law, Lee
Lindgens, Dirk
Martinez, Daniel E.
Peng, Jisong
Wigge, Philip A.
Bertulat, Bianca
Guder, Corina
Nakamura, Yukio
Ozbek, Suat
Watanabe, Hiroshi
Khalturin, Konstantin
Hemmrich, Georg
Franke, Andre
Augustin, Rene
Fraune, Sebastian
Hayakawa, Eisuke
Hayakawa, Shiho
Hirose, Mamiko
Hwang, Jung Shan
Ikeo, Kazuho
Nishimiya-Fujisawa, Chiemi
Ogura, Atshushi
Takahashi, Toshio
Steinmetz, Patrick R. H.
Zhang, Xiaoming
Aufschnaiter, Roland
Eder, Marie-Kristin
Gorny, Anne-Kathrin
Salvenmoser, Willi
Heimberg, Alysha M.
Wheeler, Benjamin M.
Peterson, Kevin J.
Boettger, Angelika
Tischler, Patrick
Wolf, Alexander
Gojobori, Takashi
Remington, Karin A.
Strausberg, Robert L.
Venter, J. Craig
Technau, Ulrich
Hobmayer, Bert
Bosch, Thomas C. G.
Holstein, Thomas W.
Fujisawa, Toshitaka
Bode, Hans R.
David, Charles N.
Rokhsar, Daniel S.
Steele, Robert E.
TI The dynamic genome of Hydra
SO NATURE
LA English
DT Article
ID BASAL METAZOAN HYDRA; STEM-CELLS; TYROSINE KINASE; SEA-ANEMONE; HOX
CLUSTER; GENE; MOLECULES; MAINTENANCE; CNIDARIANS; EXPRESSION
AB The freshwater cnidarian Hydra was first described in 1702(1) and has been the object of study for 300 years. Experimental studies of Hydra between 1736 and 1744 culminated in the discovery of asexual reproduction of an animal by budding, the first description of regeneration in an animal, and successful transplantation of tissue between animals(2). Today, Hydra is an important model for studies of axial patterning(3), stem cell biology(4) and regeneration(5). Here we report the genome of Hydra magnipapillata and compare it to the genomes of the anthozoan Nematostella vectensis(6) and other animals. The Hydra genome has been shaped by bursts of transposable element expansion, horizontal gene transfer, trans-splicing, and simplification of gene structure and gene content that parallel simplification of the Hydra life cycle. We also report the sequence of the genome of a novel bacterium stably associated with H. magnipapillata. Comparisons of the Hydra genome to the genomes of other animals shed light on the evolution of epithelia, contractile tissues, developmentally regulated transcription factors, the Spemann-Mangold organizer, pluripotency genes and the neuromuscular junction.
C1 [Blumberg, Bruce; Dana, Catherine E.; Gee, Lydia; Law, Lee; Lindgens, Dirk; Peng, Jisong; Bode, Hans R.; Steele, Robert E.] Univ Calif Irvine, Ctr Dev Biol, Irvine, CA 92717 USA.
[Chapman, Jarrod A.; Goodstein, David M.; Hellsten, Uffe; Prochnik, Simon E.; Putnam, Nicholas H.; Shu, Shengquiang] US DOE, Joint Genome Inst, Walnut Creek, CA 94598 USA.
[Kirkness, Ewen F.; Borman, Jon; Busam, Dana; Disbennett, Kathryn; Pfannkoch, Cynthia; Sumin, Nadezhda; Sutton, Granger G.; Viswanathan, Lakshmi Devi; Walenz, Brian; Remington, Karin A.; Strausberg, Robert L.; Venter, J. Craig] J Craig Venter Inst, Rockville, MD 20850 USA.
[Simakov, Oleg; Balasubramanian, Prakash G.; Bertulat, Bianca; Guder, Corina; Nakamura, Yukio; Ozbek, Suat; Watanabe, Hiroshi; Holstein, Thomas W.] Univ Heidelberg, Dept Mol Evolut & Genom, Inst Zool, D-69120 Heidelberg, Germany.
[Simakov, Oleg; Mitros, Therese; Kawashima, Takeshi; Putnam, Nicholas H.; Rokhsar, Daniel S.] Univ Calif Berkeley, Dept Mol & Cell Biol, Ctr Integrat Genom, Berkeley, CA 94720 USA.
[Hampson, Steven E.; Kibler, Dennis F.] Univ Calif Irvine, Dept Comp Sci, Irvine, CA 92697 USA.
[Weinmaier, Thomas; Rattei, Thomas; Tischler, Patrick] Tech Univ Munich, Dept Genome Oriented Bioinformat, D-85354 Freising Weihenstephan, Germany.
[Blumberg, Bruce; Gee, Lydia; Law, Lee; Lindgens, Dirk; Peng, Jisong; Bode, Hans R.] Univ Calif Irvine, Dept Dev & Cell Biol, Irvine, CA 92717 USA.
[Dana, Catherine E.; Steele, Robert E.] Univ Calif Irvine, Dept Biol Chem, Irvine, CA 92697 USA.
[Martinez, Daniel E.] Pomona Coll, Dept Biol, Claremont, CA 91711 USA.
[Wigge, Philip A.] Salk Inst Biol Studies, La Jolla, CA 92037 USA.
[Khalturin, Konstantin; Hemmrich, Georg; Franke, Andre; Augustin, Rene; Fraune, Sebastian; Bosch, Thomas C. G.] Univ Kiel, Inst Zool, D-24098 Kiel, Germany.
[Hayakawa, Eisuke; Hayakawa, Shiho; Hirose, Mamiko; Hwang, Jung Shan; Ikeo, Kazuho; Nishimiya-Fujisawa, Chiemi; Ogura, Atshushi; Gojobori, Takashi; Fujisawa, Toshitaka] Natl Inst Genet, Mishima, Shizuoka 4118540, Japan.
[Takahashi, Toshio] Suntory Inst Bioorgan Res, Osaka 6188503, Japan.
[Steinmetz, Patrick R. H.; Technau, Ulrich] Univ Vienna, Dept Mol Evolut & Dev, A-1090 Vienna, Austria.
[Zhang, Xiaoming] Univ Kansas, Med Ctr, Dept Anat & Cell Biol, Kansas City, KS 66160 USA.
[Aufschnaiter, Roland; Eder, Marie-Kristin; Gorny, Anne-Kathrin; Salvenmoser, Willi; Hobmayer, Bert] Univ Innsbruck, Inst Zool, A-6020 Innsbruck, Austria.
[Aufschnaiter, Roland; Eder, Marie-Kristin; Gorny, Anne-Kathrin; Salvenmoser, Willi; Hobmayer, Bert] Univ Innsbruck, Ctr Mol Biosci, A-6020 Innsbruck, Austria.
[Heimberg, Alysha M.; Peterson, Kevin J.] Dartmouth Coll, Dept Biol Sci, Hanover, NH 03755 USA.
[Wheeler, Benjamin M.] N Carolina State Univ, Dept Comp Sci, Raleigh, NC 27695 USA.
[Boettger, Angelika; Wolf, Alexander; David, Charles N.] Univ Munich, Dept Biol 2, D-82152 Planegg Martinsried, Germany.
RP Steele, RE (reprint author), Univ Calif Irvine, Ctr Dev Biol, Irvine, CA 92717 USA.
EM dsrokhsar@gmail.com; resteele@uci.edu
RI Putnam, Nicholas/B-9968-2008; Wigge, Philip/B-3333-2010; Franke,
Andre/B-2151-2010; Fraune, Sebastian/B-7970-2010; Bosch,
Thomas/D-5218-2011; Rattei, Thomas/F-1366-2011; Bertulat,
Bianca/F-5330-2012; Hemmrich-Stanisak, Georg/D-4319-2012; Wolf,
Alexander/K-2178-2013; Ozbek, Suat/D-3701-2014; Guder,
Corina/L-8413-2014; Simakov, Oleg/G-4572-2015; Kawashima,
Takeshi/M-4510-2015
OI Technau, Ulrich/0000-0003-4472-8258; Wolf,
Alexander/0000-0003-0649-3363; Wigge, Philip/0000-0003-4822-361X;
Putnam, Nicholas/0000-0002-1315-782X; Franke, Andre/0000-0003-1530-5811;
Weinmaier, Thomas/0000-0002-9552-3220; Rattei,
Thomas/0000-0002-0592-7791; Hemmrich-Stanisak,
Georg/0000-0002-2896-4691; Guder, Corina/0000-0002-8438-5168; Simakov,
Oleg/0000-0002-3585-4511;
FU National Science Foundation [IBN-0120591]; NSF [DEB-0716960]; Austrian
Science Fund; Norwegian Research Council; Austrian Science Fund [FWF
P16685, FWF P20734]; R. Melmon and the Gordon and Betty Moore
Foundation; Office of Science of the US Department of Energy
[DE-AC02-05CH11231]; Ministry of Education, Culture, Sports, Science,
and Technology of Japan; Deutsche Forschungsgemeinschaft [SFB617-A1,
SFB488-A12]; TOYOBO Biotechnology Foundation; Alexander von Humboldt
Foundation
FX We are grateful to S. Clifton, R. Wilson and the EST sequencing group at
the Genome Sequencing Center at the Washington University School of
Medicine for their efforts in generating the Hydra ESTs and to the
National Science Foundation for its support of the Hydra EST project
(grant number IBN-0120591). Funding for the sequencing of the Hydra
genome was provided by the National Human Genome Research Institute. We
thank J. Gerhart who, as co-chair of the National Human Genome Research
Institute Working Group on Comparative Genome Evolution, advocated
sequencing of the Hydra genome. The septate junction electron micrograph
in Fig. 3 was provided by G. Rieger. K. J. P. thanks N. Margulis for
technical assistance and the NSF for support ( grant number
DEB-0716960). U. T. was supported by the Austrian Science Fund and the
Norwegian Research Council. B. H. was supported by Austrian Science Fund
grants FWF P16685 and FWF P20734. D. S. R. was supported by R. Melmon
and the Gordon and Betty Moore Foundation. Work at the US Department of
Energy Joint Genome Institute was supported by the Office of Science of
the US Department of Energy under Contract No. DE-AC02-05CH11231. T. F.
and T. G. were supported by Grants-In-Aid for Scientific Research from
the Ministry of Education, Culture, Sports, Science, and Technology of
Japan. T. C. G. B. was supported by grants from the Deutsche
Forschungsgemeinschaft ( DFG SFB617-A1) and from the DFG Cluster of
Excellence programs 'The Future Ocean' and 'Inflammation at Interfaces'.
T. W. H. was supported by grants from the Deutsche
Forschungsgemeinschaft including SFB488-A12 and the DFG Cluster of
Excellence program 'CellNetworks'. Support for H. W. was provided by the
TOYOBO Biotechnology Foundation and the Alexander von Humboldt
Foundation. Support for A. B., B. B., C. G., C. N. D., H. W., P. G. B.,
S. O., T. F. (Mercator Professor) and Y. N. was provided by the Deutsche
Forschungsgemeinschaft.
NR 30
TC 338
Z9 361
U1 3
U2 76
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 0028-0836
J9 NATURE
JI Nature
PD MAR 25
PY 2010
VL 464
IS 7288
BP 592
EP 596
DI 10.1038/nature08830
PG 5
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 574FL
UT WOS:000275974200048
PM 20228792
ER
PT J
AU Pepper, SE
Borkowski, M
Richmann, MK
Reed, DT
AF Pepper, S. E.
Borkowski, M.
Richmann, M. K.
Reed, D. T.
TI Determination of ferrous and ferric iron in aqueous biological solutions
SO ANALYTICA CHIMICA ACTA
LA English
DT Article
DE Fe(2+) determination; Fe(3+) determination; HDEHP extraction; Ferrozine
method; Shewanella alga BrY
ID ACIDIC ORGANOPHOSPHORUS EXTRACTANTS; DI(2-ETHYLHEXYL) PHOSPHORIC-ACID;
CORROSION PRODUCTS; ORTHOPHOSPHORIC ACID; REDUCTION; MECHANISM; URANIUM;
FE(III); MEDIA; STEEL
AB A solvent extraction method was employed to determine ferrous and ferric iron in aqueous samples. Fe(3+) is selectively extracted into the organic phase (n-heptane) using HDEHP (bis(2-ethylhexyl) hydrogen phosphate) and is then stripped using a strong acid. After separation, both oxidation states and the total iron content were determined directly by ICP-MS analysis. This extraction method was refined to allow determination of both iron oxidation states in the presence of strong complexing ligands, such as citrate, NTA and EDTA. The accuracy of the method was verified by crosschecking using a refinement of the ferrozine assay. Presented results demonstrate the ability of the extraction method to work in a microbiological system in the presence of strong chelating agents following the bioreduction of Fe(3+) by the Shewanella alga BrY. Based on the results we report, a robust approach was defined to separately analyze Fe(3+) and Fe(2+) under a wide range of potential scenarios in subsurface environments where radionuclide/metal contamination may coexist with strongly complexing organic contaminants. Published by Elsevier B.V.
C1 [Pepper, S. E.; Borkowski, M.; Richmann, M. K.; Reed, D. T.] Los Alamos Natl Lab, Div Earth & Environm Sci, Carlsbad, NM 88220 USA.
RP Borkowski, M (reprint author), Los Alamos Natl Lab, Div Earth & Environm Sci, 1400 Univ Dr, Carlsbad, NM 88220 USA.
EM marian@lanl.gov
FU DOE-Carlsbad Field Office; Environmental Remediation Science Program
(DOE-OBER/OS)
FX This work was performed under the Los Alamos Actinide Chemistry and
Repository Science Program at the Carlsbad Environmental Monitoring and
Research Center operated by New Mexico State University. Funding was
provided in part by DOE-Carlsbad Field Office and by the Environmental
Remediation Science Program (DOE-OBER/OS).
NR 40
TC 8
Z9 9
U1 7
U2 31
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0003-2670
J9 ANAL CHIM ACTA
JI Anal. Chim. Acta
PD MAR 24
PY 2010
VL 663
IS 2
BP 172
EP 177
DI 10.1016/j.aca.2010.01.056
PG 6
WC Chemistry, Analytical
SC Chemistry
GA 574RM
UT WOS:000276010500008
PM 20206007
ER
PT J
AU Chen, SF
Mowery, RA
Sevcik, RS
Scarlata, CJ
Chambliss, CK
AF Chen, Shou-Feng
Mowery, Richard A.
Sevcik, Richard S.
Scarlata, Christopher J.
Chambliss, C. Kevin
TI Compositional Analysis of Water-Soluble Materials in Switchgrass
SO JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
LA English
DT Article
DE Switchgrass; compositional analysis; extractives; biomass; value-added
products water-soluble materials; feedstock
ID DEGRADATION-PRODUCTS; CORN STOVER; BIOMASS; ETHANOL; PRETREATMENT;
FEEDSTOCKS; BIOENERGY; ENERGY
AB Any valuation of a potential feedstock for bioprocessing is inherently dependent upon detailed knowledge of its chemical composition. Accepted analytical procedures for compositional analysis of biomass water-soluble extracts currently enable near-quantitative mass closure on a dry weight basis. Techniques developed in conjunction with a previous analytical assessment of corn stover have been applied to assess the composition of water-soluble materials in four representative switchgrass samples. To date, analytical characterization of water-soluble material in switchgrass has resulted in >78% mass closures for all four switchgrass samples, three of which have a mass closure of >85%. Over 30 previously unknown constituents in aqueous extracts of switchgrass were identified and quantified using a variety of chromatographic techniques. Carbohydrates (primarily sucrose, glucose, and fructose) were found to be the predominant water-soluble components of switchgrass, accounting for 18-27% of the dry weight of extractives. Total glycans (monomeric and oligomeric sugars) contributed 25-32% to the dry weight of extractives. Additional constituents contributing to the mass balance for extractives included various alditols (2-3%), organic acids (10-13%), inorganic ions (11-13%), and a distribution of oligomers presumed to represent a diverse mixture of lignin-carbohydrate complexes (30-35%). Switchgrass results are compared with previous analyses of corn stover extracts and presented in the context of their potential impact on biomass processing, feedstock storage, and future analyses of feedstock composition.
C1 [Chen, Shou-Feng; Mowery, Richard A.; Sevcik, Richard S.; Chambliss, C. Kevin] Baylor Univ, Dept Chem & Biochem, Waco, TX 76798 USA.
[Scarlata, Christopher J.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Chambliss, CK (reprint author), Baylor Univ, Dept Chem & Biochem, 1 Bear Pl,Box 97348, Waco, TX 76798 USA.
EM kevin_chambliss@baylor.edu
OI Chambliss, Kevin/0000-0003-3888-6890
NR 22
TC 19
Z9 19
U1 2
U2 15
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0021-8561
J9 J AGR FOOD CHEM
JI J. Agric. Food Chem.
PD MAR 24
PY 2010
VL 58
IS 6
BP 3251
EP 3258
DI 10.1021/jf9033877
PG 8
WC Agriculture, Multidisciplinary; Chemistry, Applied; Food Science &
Technology
SC Agriculture; Chemistry; Food Science & Technology
GA 570XB
UT WOS:000275710700002
PM 20170111
ER
PT J
AU Zhang, AP
Lu, FC
Sun, RC
Ralph, J
AF Zhang, Aiping
Lu, Fachuang
Sun, Run-Cang
Ralph, John
TI Isolation of Cellulolytic Enzyme Lignin from Wood Preswollen/Dissolved
in Dimethyl Sulfoxide/N-Methylimidazole
SO JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
LA English
DT Article
DE Lignin; cellulolytic enzyme; cell wall; dissolution; HSQC; Isolation
method
ID IONIC LIQUIDS; CELL-WALLS; DISSOLUTION; CHLORIDE; SOLVENT; NMR
AB Attempts were made to enhance polysaccharide digestibility by crude cellulases in the isolation of cellulolytic enzyme lignin (CEL) by dissolution of ball-milled wood in a dimethyl sulfoxide (DMSO)/N-methylimidazole solvent system as a pretreatment step. Wood regenerated from the DMSO/N-methylimidazole solution was hydrolyzed with crude cellulases for 48 h, removing 73.7 and 66.9% of the original carbohydrate for basswood and loblolly pine, respectively; only 61.7 and 49.2% were hydrolyzed by the crude cellulases without pretreatment. The yields of CEL isolated from regenerated ball-milled wood samples were therefore higher than those directly from ball-milled wood material, presumably via decreasing crystallinity of cellulose. For basswood, the yields of lignin were 45.8 and 36.5% (based on Klason lignin); for loblolly pine, the yields were 35.3 and 30.5%. The isolated lignins were structurally examined using two-dimensional heteronuclear single-quantum coherence ((1)H-(13)C HSQC) NMR methods, which showed that the main structural characteristics of the lignin fractions obtained using these two methods are similar except for slightly higher amounts of carbohydrates in the solvent dissolution product.
C1 [Lu, Fachuang; Ralph, John] Univ Wisconsin, Dept Biochem, Madison, WI 53726 USA.
[Lu, Fachuang; Ralph, John] Univ Wisconsin, DOE Great Lakes Bioenergy Res Ctr, Madison, WI 53726 USA.
[Zhang, Aiping; Sun, Run-Cang] S China Univ Technol, State Key Lab Pulp & Paper Engn, Guangzhou 510641, Peoples R China.
[Sun, Run-Cang] Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing 100083, Peoples R China.
RP Lu, FC (reprint author), Univ Wisconsin, Dept Biochem, 1710 Univ Ave, Madison, WI 53726 USA.
EM fachuanglu@wisc.edu
FU Department of Biochemistry, University of Wisconsin; U.S. Dairy Forage
Research Center
FX Received for review November 14, 2009. Revised manuscript received
February 5, 2010. Accepted February 08, 2010. We are grateful to the
China Scholarship Committee, Slate Education Department, for supporting
A.Z. as a visiting scholar in the Department of Biochemistry, University
of Wisconsin, and at the U.S. Dairy Forage Research Center.
NR 23
TC 27
Z9 27
U1 3
U2 42
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0021-8561
J9 J AGR FOOD CHEM
JI J. Agric. Food Chem.
PD MAR 24
PY 2010
VL 58
IS 6
BP 3446
EP 3450
DI 10.1021/jf903998d
PG 5
WC Agriculture, Multidisciplinary; Chemistry, Applied; Food Science &
Technology
SC Agriculture; Chemistry; Food Science & Technology
GA 570XB
UT WOS:000275710700029
PM 20158201
ER
PT J
AU Soyer-Uzun, S
Benmore, CJ
Siewenie, JE
Sen, S
AF Soyer-Uzun, S.
Benmore, C. J.
Siewenie, J. E.
Sen, S.
TI The nature of intermediate-range order in Ge-As-S glasses: results from
reverse Monte Carlo modeling
SO JOURNAL OF PHYSICS-CONDENSED MATTER
LA English
DT Article
ID ABSORPTION FINE-STRUCTURE; SOLID-STATE NMR; X-RAY; NEUTRON-DIFFRACTION;
SULFIDE GLASSES; AMORPHOUS-SEMICONDUCTORS; CHALCOGENIDE GLASSES;
SELENIUM GLASSES; CHEMICAL ORDER; TE GLASSES
AB The experimental neutron and x-ray diffraction data for stoichiometric and S-deficient Ge(x)As(x)S(100-2x) glasses with x = 18.2, 25.0, and 33.3 at.% have been modeled simultaneously using the reverse Monte Carlo (RMC) technique. Nearest-neighbor coordination environments, as obtained in previous x-ray absorption spectroscopy and diffraction experiments, have been employed as short-range order constraints in these simulations. The large scale three-dimensional structural models thus obtained from RMC simulation are used to investigate the nature and compositional evolution of intermediate-range structural order in these ternary glasses. The intermediate-range structural order is controlled by (1) a corner-shared three-dimensional network of AsS(3) pyramids and GeS(4) tetrahedra in the stoichiometric Ge(18.2)As(18.2)S(63.6) glass, (2) a heterogeneous structure that consists of homopolar bonded As-rich regions coexisting with a GeS(2) network in the S-deficient Ge(25)As(25)S(50) glass, and (3) a homogeneous structure resulting from the disruption of the topological continuity of the GeS(2) network and As-rich clusters regions due to the formation of Ge-As bonds in the most S-deficient Ge(33.3)As(33.3)S(33.3) glass. This scenario of the compositional evolution of intermediate-range structural order is consistent with and provides an atomistic explanation of the corresponding evolution in the position, width and intensity of the first sharp diffraction peak and the magnitude of small angle scattering in these glasses.
C1 [Soyer-Uzun, S.; Sen, S.] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA.
[Benmore, C. J.] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA.
[Siewenie, J. E.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Soyer-Uzun, S (reprint author), Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA.
OI Benmore, Chris/0000-0001-7007-7749
FU National Science Foundation [DMR 0906070]; Argonne National Laboratory;
US Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-06CH11357]
FX This work was supported by the National Science Foundation Grant DMR
0906070. The work at Argonne National Laboratory was supported by the US
Department of Energy, Office of Science, Office of Basic Energy
Sciences, under Contract No. DE-AC02-06CH11357.
NR 42
TC 6
Z9 6
U1 0
U2 4
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0953-8984
J9 J PHYS-CONDENS MAT
JI J. Phys.-Condes. Matter
PD MAR 24
PY 2010
VL 22
IS 11
AR 115404
DI 10.1088/0953-8984/22/11/115404
PG 9
WC Physics, Condensed Matter
SC Physics
GA 564OC
UT WOS:000275223400009
PM 21389466
ER
PT J
AU Hocking, RK
George, SD
Raymond, KN
Hodgson, KO
Hedman, B
Solomon, EI
AF Hocking, Rosalie K.
George, Serena DeBeer
Raymond, Kenneth N.
Hodgson, Keith O.
Hedman, Britt
Solomon, Edward I.
TI Fe L-Edge X-ray Absorption Spectroscopy Determination of Differential
Orbital Covalency of Siderophore Model Compounds: Electronic Structure
Contributions to High Stability Constants
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID IRON TRANSPORT COMPOUNDS; COORDINATION CHEMISTRY; SUBSTRATE ACTIVATION;
CRYSTAL-STRUCTURE; COMPLEXES; IRON(III); LIGANDS; ENTEROBACTIN;
PLASTOCYANIN; SOLVATION
AB Most bacteria and fungi produce low-molecular-weight iron chelators called siderophores. Although different siderophore structures have been characterized, the iron-binding moieties often contain catecholate or hydroxamate groups. Siderophores function because of their extraordinarily high stability constants (K-STAB = 10(30)-10(49)) and selectivity for Fe(Ill), yet the origin of these high stability constants has been difficult to quantify experimentally. Herein, we utilize Fe L-edge X-ray absorption spectroscopy to determine the differential orbital covalency (i.e., the differences in the mixing of the metal d-orbitals with ligand valence orbitals) of a series of siderophore model compounds. The results enable evaluation of the electronic structure contributions to their high stability constants in terms of sigma- and pi-donor covalent bonding, ionic bonding, and solvent effects. The results indicate substantial differences in the covalent contributions to stability constants of hydroxamate and catecholate complexes and show that increased sigma as well as pi bonding contributes to the high stability constants of catecholate complexes.
C1 [Raymond, Kenneth N.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Hocking, Rosalie K.; Hodgson, Keith O.; Solomon, Edward I.] Stanford Univ, Dept Chem, Stanford, CA 94305 USA.
[Hocking, Rosalie K.] Monash Univ, Monash Ctr Synchrotron Sci, Clayton, Vic 3800, Australia.
[Hocking, Rosalie K.] Monash Univ, Sch Chem, Clayton, Vic 3800, Australia.
[George, Serena DeBeer; Hodgson, Keith O.; Hedman, Britt; Solomon, Edward I.] Stanford Univ, Stanford Synchrotron Radiat Lightsource, SLAC, Stanford, CA 94305 USA.
RP Raymond, KN (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
EM edward.solomon@stantord.edu
RI DeBeer, Serena/G-6718-2012; Hocking, Rosalie/F-5763-2013
OI Hocking, Rosalie/0000-0002-2213-8786
FU NIH [GM-40392, RR-01209, A111744]; NSF [CHE-0446304]; U.S. DOE Office of
Basic Energy Sciences; U.S. DOE Office of Biological and Environmental
Research
FX R.K.H. thanks Dr. Erik C. Wasinger and Dr. Ritimukta Sarangi for their
assistance with the multiplet program and beam fine operations at SSRL.
We would like to acknowledge early contributions to this work by Dr.
Tami Westre, Ms. Ekaterina Y. Shishova, and Drs. Emily Dertz and Jide
Xu. This work was supported by grants from the NIH GM-40392 and NSF
CHE-0446304 to E.I.S., NIH RR-01209 to K.O.H, and NIH A111744 to K.N.R.
The synchrotron data described herein were collected at SSRL, which is
funded by the U.S. DOE Office of Basic Energy Sciences. The SSRL
Structural Molecular Biology Program is supported by the NIH National
Center for Research Resources, Biomedical Technology Program, and by the
U.S. DOE Office of Biological and Environmental Research. The NCI
national facility in Australia and the Monash Sun Grid are acknowledged
for access to Computer time.
NR 72
TC 30
Z9 30
U1 3
U2 52
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0002-7863
J9 J AM CHEM SOC
JI J. Am. Chem. Soc.
PD MAR 24
PY 2010
VL 132
IS 11
BP 4006
EP 4015
DI 10.1021/ja9090098
PG 10
WC Chemistry, Multidisciplinary
SC Chemistry
GA 572XC
UT WOS:000275868700061
PM 20187651
ER
PT J
AU Mao, YL
Stocks, GM
Zhong, JX
AF Mao, Yuliang
Stocks, G. Malcolm
Zhong, Jianxin
TI First-principles study of the doping effects in bilayer graphene
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID EPITAXIAL GRAPHENE; BERRYS PHASE; SCATTERING; BANDGAP
AB We used first-principles calculations to study the doping effects in bilayer graphene, focusing on Au substitute doping in the upper layer of graphene. We found that Au doping in the upper layer maintains the lattice structure of the lower graphene layer. Our study on binding energy shows that the Au-doped bilayer structure is stable with Au atom tightly confined in a small region between the upper and lower layers. Charge density analysis indicates that charge is transferred from the Au donor to the carbon atoms in the lower layer, increasing the carrier density in the lower graphene.
C1 [Mao, Yuliang; Zhong, Jianxin] Xiangtan Univ, Fac Mat Optoelect & Phys, Lab Quantum Engn & Micronano Energy Technol, Xiangtan 411105, Hunan, Peoples R China.
[Stocks, G. Malcolm] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Mao, YL (reprint author), Xiangtan Univ, Fac Mat Optoelect & Phys, Lab Quantum Engn & Micronano Energy Technol, Xiangtan 411105, Hunan, Peoples R China.
EM ylmao@xtu.edu.cn
RI Stocks, George Malcollm/Q-1251-2016
OI Stocks, George Malcollm/0000-0002-9013-260X
FU National Natural Science Foundation of China [10774127, 10947173];
Research Foundation of Hunan Provincial Education Department [09B103];
Research Foundation of XiangTan University [09QDZ07]; Chang Jiang
Scholars Program; Ministry of Education, China [708068]; DOE Office of
Science [DE-AC05-00OR22725]
FX We thank the referees for their constructive comments and suggestions.
This work was supported by the National Natural Science Foundation of
China (nos 10774127 and 10947173), by Research Foundation of Hunan
Provincial Education Department (no. 09B103), by the Research Foundation
of XiangTan University (no. 09QDZ07), by the Chang Jiang Scholars
Program and Project no. 708068, Ministry of Education, China, and
partially by the Materials Sciences and Engineering Division Program of
the DOE Office of Science under contract no. DE-AC05-00OR22725 with
UT-Battelle, LLC.
NR 32
TC 20
Z9 20
U1 2
U2 23
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 1367-2630
J9 NEW J PHYS
JI New J. Phys.
PD MAR 24
PY 2010
VL 12
AR 033046
DI 10.1088/1367-2630/12/3/033046
PG 10
WC Physics, Multidisciplinary
SC Physics
GA 574GG
UT WOS:000275976700008
ER
PT J
AU Jakobsson, HE
Jernberg, C
Andersson, AF
Sjolund-Karlsson, M
Jansson, JK
Engstrand, L
AF Jakobsson, Hedvig E.
Jernberg, Cecilia
Andersson, Anders F.
Sjolund-Karlsson, Maria
Jansson, Janet K.
Engstrand, Lars
TI Short-Term Antibiotic Treatment Has Differing Long-Term Impacts on the
Human Throat and Gut Microbiome
SO PLOS ONE
LA English
DT Article
ID 16S RIBOSOMAL-RNA; GRADIENT GEL-ELECTROPHORESIS; HELICOBACTER-PYLORI
INFECTION; INTESTINAL MICROFLORA; RESISTANCE GENES; MACROLIDE
RESISTANCE; CLARITHROMYCIN; FLORA; POPULATIONS; PERSISTENCE
AB Antibiotic administration is the standard treatment for the bacterium Helicobacter pylori, the main causative agent of peptic ulcer disease and gastric cancer. However, the long-term consequences of this treatment on the human indigenous microbiota are relatively unexplored. Here we studied short-and long-term effects of clarithromycin and metronidazole treatment, a commonly used therapy regimen against H. pylori, on the indigenous microbiota in the throat and in the lower intestine. The bacterial compositions in samples collected over a four-year period were monitored by analyzing the 16S rRNA gene using 454-based pyrosequencing and terminal-restriction fragment length polymorphism (T-RFLP). While the microbial communities of untreated control subjects were relatively stable over time, dramatic shifts were observed one week after antibiotic treatment with reduced bacterial diversity in all treated subjects in both locations. While the microbiota of the different subjects responded uniquely to the antibiotic treatment some general trends could be observed; such as a dramatic decline in Actinobacteria in both throat and feces immediately after treatment. Although the diversity of the microbiota subsequently recovered to resemble the pre treatment states, the microbiota remained perturbed in some cases for up to four years post treatment. In addition, four years after treatment high levels of the macrolide resistance gene erm(B) were found, indicating that antibiotic resistance, once selected for, can persist for longer periods of time than previously recognized. This highlights the importance of a restrictive antibiotic usage in order to prevent subsequent treatment failure and potential spread of antibiotic resistance.
C1 [Jakobsson, Hedvig E.; Jernberg, Cecilia; Andersson, Anders F.; Sjolund-Karlsson, Maria; Engstrand, Lars] Swedish Inst Infect Dis, Dept Bacteriol, Solna, Sweden.
[Jakobsson, Hedvig E.; Engstrand, Lars] Karolinska Inst, Dept Microbiol Tumor & Cell Biol, Stockholm, Sweden.
[Andersson, Anders F.] Uppsala Univ, Dept Ecol & Evolut, Evolutionary Biol Ctr, Uppsala, Sweden.
[Jansson, Janet K.] Swedish Univ Agr Sci, Dept Microbiol, S-75007 Uppsala, Sweden.
[Jansson, Janet K.] Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Ecol, Berkeley, CA 94720 USA.
RP Jakobsson, HE (reprint author), Swedish Inst Infect Dis, Dept Bacteriol, Solna, Sweden.
EM lars.engstrand@smi.se
OI Andersson, Anders/0000-0002-3627-6899
FU Ekhaga foundation; Soderberg foundation; U. S. Department of Energy
[DE-AC02-05CH11231]
FX The Ekhaga foundation and the Soderberg foundation, and in part by the
U. S. Department of Energy Contact DE-AC02-05CH11231 with Lawrence
Berkeley National Laboratory. The funders had no role in study design,
data collection and analysis, decision to publish, or preparation of the
manuscript.
NR 45
TC 261
Z9 270
U1 16
U2 110
PU PUBLIC LIBRARY SCIENCE
PI SAN FRANCISCO
PA 185 BERRY ST, STE 1300, SAN FRANCISCO, CA 94107 USA
SN 1932-6203
J9 PLOS ONE
JI PLoS One
PD MAR 24
PY 2010
VL 5
IS 3
AR e9836
DI 10.1371/journal.pone.0009836
PG 12
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 573FT
UT WOS:000275894500009
PM 20352091
ER
PT J
AU Azarov, AY
Titov, AI
Karaseov, PA
Kucheyev, SO
Hallen, A
Kuznetsov, AY
Svensson, BG
Pathak, AP
AF Azarov, A. Yu.
Titov, A. I.
Karaseov, P. A.
Kucheyev, S. O.
Hallen, A.
Kuznetsov, A. Yu.
Svensson, B. G.
Pathak, A. P.
TI Structural damage in ZnO bombarded by heavy ions
SO VACUUM
LA English
DT Article; Proceedings Paper
CT 19th International Conference on the Interaction of Ions with Surfaces
CY AUG 21-25, 2009
CL Zvenigorod, RUSSIA
SP Russian Acad Sci, Guest House
DE Ion implantation; Defects; ZnO
AB The effect of implantation parameters on damage build-up in ZnO bombarded with Bi and Er ions is studied by Rutherford backscattering/channelling spectrometry. The results show that the damage accumulation behaviour in ZnO is different dramatically from that in other semiconductors. In particular, a variation of implantation parameters, such as collision cascade density, sample temperature and ion flux, has only a minor influence on the damage accumulation in the crystal bulk for the case of such heavy ions. Moreover, an intermediate damage peak, between the surface and bulk defect peaks, is observed for all the irradiation conditions studied. The cascade density affects the behaviour of this intermediate peak with increasing ion dose. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Azarov, A. Yu.; Kuznetsov, A. Yu.; Svensson, B. G.] Univ Oslo, Dept Phys, NO-0316 Oslo, Norway.
[Titov, A. I.; Karaseov, P. A.] State Polytech Univ, Dept Phys Elect, St Petersburg 195251, Russia.
[Kucheyev, S. O.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
[Hallen, A.] Royal Inst Technol, ICT, MAP, SE-16440 Stockholm, Sweden.
[Pathak, A. P.] Univ Hyderabad, Sch Phys, Hyderabad 500046, Andhra Pradesh, India.
RP Azarov, AY (reprint author), Univ Oslo, Dept Phys, POB 1048 Blindern, NO-0316 Oslo, Norway.
EM a.y.azarow@smn.uio.no
RI Karaseov, Platon/P-6861-2015; Titov, Andrey/A-4608-2017
OI Karaseov, Platon/0000-0003-2511-0188; Titov, Andrey/0000-0003-4933-9534
NR 13
TC 11
Z9 11
U1 0
U2 7
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0042-207X
J9 VACUUM
JI Vacuum
PD MAR 24
PY 2010
VL 84
IS 8
SI SI
BP 1058
EP 1061
DI 10.1016/j.vacuum.2009.10.041
PG 4
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 585JO
UT WOS:000276821700016
ER
PT J
AU Wang, RY
Feser, JP
Gu, X
Yu, KM
Segalman, RA
Majumdar, A
Milliron, DJ
Urban, JJ
AF Wang, Robert Y.
Feser, Joseph P.
Gu, Xun
Yu, Kin Man
Segalman, Rachel A.
Majumdar, Arun
Milliron, Delia J.
Urban, Jeffrey J.
TI Universal and Solution-Processable Precursor to Bismuth Chalcogenide
Thermoelectrics
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID THERMAL-PROPERTIES; SILICON NANOWIRES; 3-OMEGA METHOD; TELLURIDE; FILMS;
PERFORMANCE; REDUCTION; DEVICES; BI2TE3; MERIT
C1 [Wang, Robert Y.; Yu, Kin Man; Segalman, Rachel A.; Majumdar, Arun; Milliron, Delia J.; Urban, Jeffrey J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
[Feser, Joseph P.; Majumdar, Arun] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA.
[Gu, Xun; Segalman, Rachel A.] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA.
RP Milliron, DJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
EM DMilliron@lbl.gov; JJUrban@lbl.gov
RI Milliron, Delia/D-6002-2012; Yu, Kin Man/J-1399-2012; Wang,
Robert/A-5801-2013;
OI Yu, Kin Man/0000-0003-1350-9642; Segalman, Rachel/0000-0002-4292-5103
FU U.S. Department of Energy [DE-AC02-05CH11231]; Lawrence Berkeley
National Laboratory
FX Work at the Molecular Foundry was supported by the Office of Science,
Office of Basic Energy Sciences, of the U.S. Department of Energy under
Contract No. DE-AC02-05CH11231. R.W., J.F., X.G., A.M., R.S., and J.J.U.
gratefully acknowledges partial support from DOE-BES Office of Science
via the Thermoelectrics program at Lawrence Berkeley National
Laboratory. We also thank the UC Berkeley Microfabrication Laboratory
for use of their facilities.
NR 31
TC 36
Z9 36
U1 3
U2 36
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0897-4756
J9 CHEM MATER
JI Chem. Mat.
PD MAR 23
PY 2010
VL 22
IS 6
BP 1943
EP 1945
DI 10.1021/cm903769q
PG 3
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 570XJ
UT WOS:000275711500001
ER
PT J
AU Lee, S
Cho, IS
Lee, JH
Kim, DH
Kim, DW
Kim, JY
Shin, H
Lee, JK
Jung, HS
Park, NG
Kim, K
Ko, MJ
Hong, KS
AF Lee, Sangwook
Cho, In-Sun
Lee, Ji Hae
Kim, Dong Hoe
Kim, Dong Wook
Kim, Jin Young
Shin, Hyunho
Lee, Jung-Kun
Jung, Hyun Suk
Park, Nam-Gyu
Kim, Kyungkon
Ko, Min Jae
Hong, Kug Sun
TI Two-Step Sol-Gel Method-Based TiO2 Nanoparticles with Uniform Morphology
and Size for Efficient Photo-Energy Conversion Devices
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID ANATASE TIO2; PHOTOCATALYTIC ACTIVITY; TITANIUM-OXIDE; SHAPE CONTROL;
THIN-FILMS; CELLS; NANOTUBES; PARTICLES; IMPEDANCE; LIGHT
AB The performance of dye-sensitized solar cells (DSSCs) consisting of anatase TiO2 nanoparticles that were synthesized via a two-step sol-gel process was using electron transport and optical characterizations. Spherical nanoparticles with the average diameter of 20 nm, elongated nanorods with all aspect ratio (AR) of 5, and nanowires with AR = 10 were synthesized. The synthesized nanoparticles possess narrow size distribution, high crystallinity, and negligible surface defects and residual organics, which is very Suitable for achieving highly efficient photovoltaic devices. The effect of particle size distribution oil the performance of DSSC was characterized by comparing the synthesized TiO2 nanoparticles and commercial TiO2, nanoparticles (P25). In comparison with P25, the two-step Sol-gel-grown nanoparticles significantly improved the photovoltaic conversion efficiency by 32.5%, because of a larger specific surface area, higher electrolyte penetration ability, and lower optical reflectance. Therefore, the photoelectrode of the two-step sol-gel-derived TiO2 nanoparticles enhanced the adsorption of dye sensitizers (N719), promotes the transfer of photo-generated carriers, and decreases the ratio of reflected solar spectrum that is not harnessed. As a result, the energy conversion efficiency of DSSCs increased to 6.72% without the use Of a scattering layer and coadsorbants. We also investigated the effect of aspect ratio of TiO2, particles oil photovoltaic characteristic. Ail increase in the aspect ratio of the synthesized nanomaterials resulted in an increase in carrier lifetime. A decrease in the density of grain boundaries Suppresses the trapping of carriers and the subsequent recombination of electron-hole pairs. This Study demonstrates that the two-step sol-gel-derived nanomaterials provide a way to achieve appreciable efficiency of photoconversion devices.
C1 [Lee, Jung-Kun] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15260 USA.
[Lee, Sangwook; Cho, In-Sun; Kim, Dong Hoe; Kim, Dong Wook; Hong, Kug Sun] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151744, South Korea.
[Lee, Sangwook; Cho, In-Sun; Hong, Kug Sun] Seoul Natl Univ, Res Inst Adv Mat, Seoul 151744, South Korea.
[Lee, Ji Hae; Jung, Hyun Suk] Kookmin Univ, Sch Adv Mat Engn, Seoul 136702, South Korea.
[Kim, Jin Young] Natl Renewable Energy Lab, Chem & Biosci Ctr, Golden, CO 80401 USA.
[Shin, Hyunho] Kangnung Natl Univ, Dept Ceram Engn, Kangnung 210702, South Korea.
[Park, Nam-Gyu] Sungkyunkwan Univ, Sch Chem Engn, Suwon 440746, South Korea.
[Kim, Kyungkon; Ko, Min Jae] Korea Inst Sci & Technol, Div Mat Sci & Technol, Ctr Energy Mat, Seoul 136791, South Korea.
RP Lee, JK (reprint author), Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15260 USA.
EM jul37@pitt.edu; hjung@kookmin.ac.kr; kshongss@plaza.snu.ac.kr
RI Jung, Hyun Suk/D-4745-2011; Kim, Jin Young/B-7077-2012; Cho, In
Sun/H-6557-2011; Park, Nam-Gyu/F-2477-2014; Lee, Sangwook/O-9166-2015;
Jung, Hyun Suk/H-3659-2015;
OI Kim, Jin Young/0000-0001-7728-3182; Lee, Sangwook/0000-0002-3535-0241;
Cho, In Sun/0000-0001-5622-7712
FU Korea Science and Engineering Foundation (KOSEF); Korea government
(MEST) [R01-2007-000-11075-0, R11-2005-048-00000-0, 2009-0082659]; ERC,
CMPS [2009-0065889]; Kookmin University in Korea
FX This work Was Supported by it Korea Science and Engineering Foundation
(KOSEF) grant funded by the Korea government (MEST) (Nos.
R01-2007-000-11075-0, R11-2005-048-00000-0, ERC, CMPS and 2009-0065889).
This work Was also Supported by the Nano R&D program through the
National Research Foundation of Korea funded by MEST (No. 2009-0082659)
and the research program 2009 of Kookmin University in Korea.
NR 47
TC 100
Z9 101
U1 11
U2 118
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0897-4756
J9 CHEM MATER
JI Chem. Mat.
PD MAR 23
PY 2010
VL 22
IS 6
BP 1958
EP 1965
DI 10.1021/cm902842k
PG 8
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 570XJ
UT WOS:000275711500006
ER
PT J
AU Clem, TA
Kavulak, DFJ
Westling, EJ
Frechet, JMJ
AF Clem, Tabitha A.
Kavulak, David F. J.
Westling, Erik J.
Frechet, Jean M. J.
TI Cyclometalated Platinum Polymers: Synthesis, Photophysical Properties,
and Photovoltaic Performance
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID FIELD-EFFECT TRANSISTORS; HETEROJUNCTION SOLAR-CELLS; CONJUGATED
POLYMERS; BAND-GAP; CHARGE-TRANSPORT; TRIPLET-STATE; EFFICIENCY;
SEMICONDUCTORS; POLYTHIOPHENE; COPOLYMERS
AB The synthesis and characterization of platinum-containing conjugated polymers in Which the platinum atom is attached to the conjugated backbone via a C boolean AND N ligand is presented. The newly designed platinum-containing monomer can be polymerized under both Stille and Suzuki conditions. The polymers exhibit optical bandgaps between 2.1 and 1.65 eV depending oil the choice of comonomer. Triplet exciton formation is detected indirectly by measuring photosensitized emission of singlet oxygen in both solution and in film. The ability of the materials to sensitize formation of singlet oxygen varies both with excitation wavelength and with the change from solution to solid state. This Study provides design principles for developing conjugated polymers with significant triplet yields in the solid state. The photovoltaic performance of these Polymers was also evaluated in preliminary experiments with power conversion efficiencies as high as 1.3% obtained for a bulk heterojunction cell with PCBM.
C1 [Clem, Tabitha A.; Kavulak, David F. J.; Westling, Erik J.; Frechet, Jean M. J.] Univ Calif Berkeley, Coll Chem, Berkeley, CA 94720 USA.
[Kavulak, David F. J.; Westling, Erik J.; Frechet, Jean M. J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Frechet, JMJ (reprint author), Univ Calif Berkeley, Coll Chem, Berkeley, CA 94720 USA.
EM frechet@berkeley.edu
OI Frechet, Jean /0000-0001-6419-0163
FU U.S. Department of Energy [DE-AC02-05CH11231]
FX This work was supported by the Director, Office of Science, Office of
Basic Energy Sciences, Materials Sciences land Engineering Division, of
the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. We
also thank Thomas W. Holcombe and Jill Millstone for helpful discussions
NR 48
TC 37
Z9 37
U1 2
U2 16
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0897-4756
J9 CHEM MATER
JI Chem. Mat.
PD MAR 23
PY 2010
VL 22
IS 6
BP 1977
EP 1987
DI 10.1021/cm9029038
PG 11
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 570XJ
UT WOS:000275711500008
ER
PT J
AU Wang, SA
Alekseev, EV
Ling, J
Liu, GK
Depmeier, W
Albrecht-Schmitt, TE
AF Wang, Shuao
Alekseev, Evgeny V.
Ling, Jie
Liu, Guokui
Depmeier, Wulf
Albrecht-Schmitt, Thomas E.
TI Polarity and Chirality in Uranyl Borates: Insights into Understanding
the Vitrification of Nuclear Waste and the Development of Nonlinear
Optical Materials
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID BOND-VALENCE PARAMETERS; ONE-DIMENSIONAL URANYL; CATION-CATION
INTERACTIONS; STRUCTURAL-CHARACTERIZATION; CRYSTAL-CHEMISTRY;
HYDROTHERMAL PREPARATION; PLUTONIUM COMPOUND; BORIC-ACID; IODATES;
URANIUM
AB Four new sodium uranyl borates, alpha-Na[(UO2)(2)B10O15(OH)(5)] (NaUBO-1), beta-Na[(UO2)2B(10)O(15)-(OH)(5)] (NaUBO-2), Na[(UO2)(2) B10O15(OH)(5)]center dot 3H(2)O (NaUBO-3), and Na[UO2)B6O10(OH)]center dot 2H(2)O (NaUBO-4), and four new thallium uranyl borates, alpha-Tl-2[(UO2)(2)B11O18(OH)(3)] (TIUBO-1), beta-Tl-2[(UO2)(2)B11O18(OH)(3)] (TIUBO-2), Tl[(UO2)(2)B10O16(OH)(3)] (TIUBO-3), and Tl-2[(UO2)(2)B11O19-OH)] (TIUBO-4), have been prepared via the reaction of sodium nitrate or thallium nitrate, uranyl nitrate, and excess boric acid at 190 degrees C. These compounds share a common structural motif consisting of a linear uranyl, UO22+, cation surrounded by BO3 triangles and BO4 tetrahedra to create a UO8 hexagonal bipyramidal environment around uranium. The borate anions bridge between uranlyl units to create sheets. Additional BO3 triangles extend from the polyborate layers and are directed approximately perpendicular to the sheets. In some compounds, these units can link the layers togethher to yield three-dimensional networks with large pores to house the Na+ or Tl+ cations and water molecules. The structures are all noncentrosymmetric and are either polar or chiral. While the uranyl borate layers are noncentrosymmetric in and of themselves, there is also twisting of thhe interlayer BO3 groups to reduce thhe interlayer spacing, producing helical features in some structures. Na[(UO2)B6O10(OH)]center dot 2H(2)O and beta-Tl-2[(UO2)(2)B11O18(OH)(3)], which can be obtained as pure phases, display second-harmonic generation of 532 nm light from 1064 nm light.
C1 [Wang, Shuao; Alekseev, Evgeny V.; Ling, Jie; Albrecht-Schmitt, Thomas E.] Univ Notre Dame, Dept Civil Engn & Geol Sci, Notre Dame, IN 46556 USA.
[Wang, Shuao; Alekseev, Evgeny V.; Ling, Jie; Albrecht-Schmitt, Thomas E.] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA.
[Alekseev, Evgeny V.; Depmeier, Wulf] Univ Kiel, Inst Geowissensch, D-24118 Kiel, Germany.
[Liu, Guokui] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
RP Alekseev, EV (reprint author), Univ Notre Dame, Dept Civil Engn & Geol Sci, 156 Fitzpatrick Hall, Notre Dame, IN 46556 USA.
RI Ling, Jie/A-4136-2011; Wang, Shuao/H-7373-2012;
OI Alekseev, Evgeny/0000-0002-4919-5211
NR 51
TC 62
Z9 63
U1 9
U2 32
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0897-4756
EI 1520-5002
J9 CHEM MATER
JI Chem. Mat.
PD MAR 23
PY 2010
VL 22
IS 6
BP 2155
EP 2163
DI 10.1021/cm9037796
PG 9
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 570XJ
UT WOS:000275711500028
ER
PT J
AU Sainsbury, T
Erickson, K
Okawa, D
Zonte, CS
Frechet, JMJ
Zettl, A
AF Sainsbury, Toby
Erickson, Kris
Okawa, David
Zonte, C. Sebastian
Frechet, Jean M. J.
Zettl, Alex
TI Kevlar Functionalized Carbon Nanotubes for Next-Generation Composites
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID MECHANICAL-PROPERTIES; RAMAN-SPECTROSCOPY; HIGH-STRENGTH; FIBERS;
POLYMERIZATION; REINFORCEMENT; MORPHOLOGY; SURFACE; MATRIX; ARRAYS
AB We report a sequential functionalization methodology for the covalent modification of multi-walled carbon nanotubes (MWNTs) with one and a half repeat units of the polymer poly-p-phneyleneterephthalmide (PPTA), Kevlar. Covalent attachment of PPTA monomer units, p-phenylenediamine (PDA) and terephthaloyl chloride (TPC), to the surface fo MWNTs results in PPTA oligomer units forming an organic sheathh around the nanotuubes, PPTA-functionalized-MWNTs (PPTA-MWNTs). PPTA-MWNTs possess chemical functionality identical to that of PPTA, and thus provide nanoscale scaffolds which may be readily dispersed within a monomer solution and participate in the polymerization reaction to form a PPTA-MWNT/PPTA composite. We show that formation of PPTA in the presence of PPTA-MWNTs leads to a uniform dispersion of MWNTs within the polymer matrix, in contrast to aggregated masses of MWNTs in the case of pristine-MWNTs. The covalent attachment of oligomeric PPTA units to the surface of MWNTs represents the formation of a funcational nanoscale building block which can be readily dispersed and integrated within the polymer PPTA to form a novel composite material. The implications of tuning the surface chemistries of carbon nanotubes (CNTs) to the chemistry of host polymer matrices are considered.
C1 [Sainsbury, Toby; Erickson, Kris; Okawa, David; Zettl, Alex] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Erickson, Kris; Okawa, David; Zonte, C. Sebastian; Frechet, Jean M. J.] Univ Calif Berkeley, Coll Chem, Berkeley, CA 94720 USA.
[Sainsbury, Toby; Frechet, Jean M. J.; Zettl, Alex] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Zettl, A (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM azettl@berkeley.edu
RI Zettl, Alex/O-4925-2016;
OI Zettl, Alex/0000-0001-6330-136X; Frechet, Jean /0000-0001-6419-0163
FU U.S. Department of Energy [DE-AC02-05CH11231]
FX The authors acknowledge financial support from the Director, Office of
Science, Office of Basic Energy Sciences, Division of Materials Sciences
and Engineering, of the U.S. Department of Energy under Contract
DE-AC02-05CH11231.
NR 33
TC 23
Z9 24
U1 3
U2 42
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0897-4756
J9 CHEM MATER
JI Chem. Mat.
PD MAR 23
PY 2010
VL 22
IS 6
BP 2164
EP 2171
DI 10.1021/cm902987k
PG 8
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 570XJ
UT WOS:000275711500029
ER
PT J
AU Egedal, J
Le, A
Katz, N
Chen, LJ
Lefebvre, B
Daughton, W
Fazakerley, A
AF Egedal, J.
Le, A.
Katz, N.
Chen, L. -J.
Lefebvre, B.
Daughton, W.
Fazakerley, A.
TI Cluster observations of bidirectional beams caused by electron trapping
during antiparallel reconnection
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID MAGNETIC RECONNECTION; EARTHS MAGNETOTAIL; FIELD
AB So-called bidirectional electron beams have been observed by a number of spacecraft missions mainly in the inflow of reconnection regions. Here we show that these beam-like features in the electron distribution function are explained by electron trapping. The trapping is mainly controlled by a positive acceleration potential, Phi(parallel to), which is related to the structure of the parallel electric fields in the vicinity of the reconnection region. Guided by the results of a kinetic simulation, we extend a recent analytical model for the electron distribution function applicable to the inflow region in antiparallel reconnection. The model is successfully compared to data observed by the four Cluster spacecraft inside an active reconnection region. The anisotropy recorded in the electron distributions is consistent with mainly electric trapping of electrons by Phi(parallel to). In the analysis we determine the profiles of Phi(parallel to) along the paths of the Cluster spacecraft during their encounter with a reconnection region. Typical values of e Phi(parallel to) are in excess of 1 keV (much higher than the electron temperature in the ambient lobe plasma) and Phi(parallel to) traps all thermal electrons. This is important for the internal structure of the Hall current system associated with the ion diffusion region because extended trapping significantly alters the electrical and kinematic properties of the electron fluid. Finally, at the boundary between the inflow and exhaust regions the values of e Phi(parallel to) in the inflow region smoothly approach the shoulder energies (up to 15 keV) of the so-called flat-top distribution observed in the reconnection exhaust. This suggests that Phi(parallel to) may be important also to the formation of the flat-top distributions.
C1 [Egedal, J.; Le, A.; Katz, N.] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA.
[Egedal, J.; Le, A.; Katz, N.] MIT, Dept Phys, Cambridge, MA 02139 USA.
[Chen, L. -J.; Lefebvre, B.] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA.
[Daughton, W.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Fazakerley, A.] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England.
RP Egedal, J (reprint author), MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA.
EM jegedal@psfc.mit.edu
RI Chen, Li-Jen/C-2106-2012; Daughton, William/L-9661-2013
FU DOE [ER54878]; NSF/DOE [PHY-0613734]
FX This work was supported in part by DOE Junior Faculty Award ER54878 and
NSF/DOE Award PHY-0613734.
NR 38
TC 30
Z9 30
U1 0
U2 4
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR 23
PY 2010
VL 115
AR A03214
DI 10.1029/2009JA014650
PG 17
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 574XQ
UT WOS:000276027900001
ER
PT J
AU Witte, KN
Kewalramani, S
Kuzmenko, I
Sun, W
Fukuto, M
Won, YY
AF Witte, Kevin N.
Kewalramani, Sumit
Kuzmenko, Ivan
Sun, Wei
Fukuto, Masafumi
Won, You-Yeon
TI Formation and Collapse of Single-Monomer-Thick Monolayers of
Poly(n-butyl acrylate) at the Air-Water Interface
SO MACROMOLECULES
LA English
DT Article
ID LATERAL NANOSCALE HETEROGENEITIES; WEAK POLYELECTROLYTE BRUSHES;
BREWSTER-ANGLE MICROSCOPY; SURFACE PRESSURE; POLY(METHYL METHACRYLATE);
CONCENTRATION-DEPENDENCE; NEUTRON REFLECTOMETRY; POLYMER MONOLAYER;
LIGHT-SCATTERING; SPREAD
AB The behavior of poly(n-butyl acrylate) (PnBA) spread at the air-water interface has been studied for a full range of surface coverages and several molecular weights. At low and intermediate surface coverages, the surface pressure-area isotherm behavior of the polymer is found to follow the expected scaling laws. In the dilute regime the pressure is an increasing function of surface coverage and a decreasing function of molecular weight. In the semidilute regime the surface pressure becomes independent of molecular weight, and a Flory exponent for the two-dimensional radius of gyration is found to be nu = 0.57 +/- 0.02. Beginning in the high coverage concentrated regime, at c surface pressure of around 15 mN/m, and through the full coverage regime (where the water in the subphase is fully covered and not exposed to air), X-ray reflectivity (XR) measurements show the formation of a continuous water-free rnonolayer (i.e., one monomer thick) film of the polymer. At surface concentrations above the transition point to the full coverage regime (alternatively called the "collapsed" regime hereafter for the reason that will become apparent below), Brewster angle microscopy (BAM) shows that the excess polymer material does not distribute uniformly in the polymer film layer but instead leads to formation of micrometer-scale isolated globular domains of roughly uniform size. Further, it was observed that the number of such domains increases its the surface polymer concentration is increased, whereas the size of the globular domains is largely unaffected by the concentration variation. X-ray grazing incidence diffraction (GID) indicates that these domains are regions of bulklike (amorphous) polymer. These and other observations, including the invariant nature of the monolayer throughout the compression (confirmed by XR), the plateau nature of surface pressure-area isotherm throughout the collapsed regime, and the reversible nature of the domain formation (evidenced by BAM), suggest that the globular domains formed at high surface concentrations of PnBA are in it type of coexistence with the uniform rnonolayer. A simple thermodynamic model considering the entropic penalty of confining the polymer chains to monolayer, the translational entropy of the domains, and the surface energy of the interface is made in order to understand the behavior of the polymer as it becomes excluded from the monolayer. This argument suggests that the excess polymer should form a single large domain in order to minimize the large surface energy at the water-polymer interface. The presence of many small domains suggests the domains are kinetically trapped in a local, rather than global, equilibrium.
C1 [Witte, Kevin N.; Sun, Wei; Won, You-Yeon] Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA.
[Kewalramani, Sumit; Fukuto, Masafumi] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
[Kuzmenko, Ivan] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA.
RP Won, YY (reprint author), Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA.
EM yywon@ecn.purdue.edu
NR 38
TC 13
Z9 13
U1 1
U2 18
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0024-9297
J9 MACROMOLECULES
JI Macromolecules
PD MAR 23
PY 2010
VL 43
IS 6
BP 2990
EP 3003
DI 10.1021/ma901842q
PG 14
WC Polymer Science
SC Polymer Science
GA 570XH
UT WOS:000275711300044
ER
PT J
AU Paluch, M
Pawlus, S
Sokolov, AP
Ngai, KL
AF Paluch, Marian
Pawlus, Sebastian
Sokolov, Alexei P.
Ngai, K. L.
TI Sub-Rouse Modes in Polymers Observed by Dielectric Spectroscopy
SO MACROMOLECULES
LA English
DT Article
ID THERMORHEOLOGICAL COMPLEXITY; VISCOELASTIC PROPERTIES; SEGMENTAL
DYNAMICS; POLY(PHENYLMETHYL SILOXANE); CONCENTRATION FLUCTUATIONS;
SOFTENING DISPERSION; AMORPHOUS POLYMERS; MOLECULAR-WEIGHT;
ALPHA-RELAXATION; TEMPERATURE
AB One of the characteristic features of polymer dynamics is the existence of additional relaxation processes that are related to connectivity of monomers in polymer chain and are absent in small molecular liquids. These processes are usually described as purely entropic Rouse modes and appear on time scales much longer than segmental (structural) relaxation in polymers. They are commonly observed by mechanical relaxation spectroscopy and are detected as normal modes in dielectric spectra of some polymers (where dipole moment accumulates along the chain). Here we present the evidence of additional modes that appear in dielectric relaxation spectra of some polymers between the segmental and Rouse modes. We identified these modes as sub-house modes, the same as those previously found by mechanical spectroscopy. We also demonstrate that these modes are not detected in the dielectric loss spectra of many polymers. Moreover, existence of these modes does not correlate with the existence of dipole moment along the polymer chain. A possible explanation of this behavior is discussed.
C1 [Paluch, Marian; Pawlus, Sebastian] Silesian Univ, Inst Phys, PL-40007 Katowice, Poland.
[Sokolov, Alexei P.] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA.
[Sokolov, Alexei P.] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA.
[Ngai, K. L.] USN, Res Lab, Washington, DC 20375 USA.
RP Pawlus, S (reprint author), Silesian Univ, Inst Phys, Ul Uniwersytecka 4, PL-40007 Katowice, Poland.
FU European Economic Area Financial Mechanism; NSF [DMR-0804571]; Office of
Naval Research
FX S. Pawlus acknowledges financial assistance from FNP HOMING program
(2008) supported by the European Economic Area Financial Mechanism.
A.P.S. acknowledges financial support from NSF, Polymer program
(DMR-0804571). K.L.N. was supported by the Office of Naval Research.
NR 28
TC 29
Z9 29
U1 4
U2 21
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0024-9297
J9 MACROMOLECULES
JI Macromolecules
PD MAR 23
PY 2010
VL 43
IS 6
BP 3103
EP 3106
DI 10.1021/ma9027382
PG 4
WC Polymer Science
SC Polymer Science
GA 570XH
UT WOS:000275711300056
ER
PT J
AU Kim, TH
Angst, M
Hu, B
Jin, R
Zhang, XG
Wendelken, JF
Plummer, EW
Li, AP
AF Kim, Tae-Hwan
Angst, M.
Hu, B.
Jin, R.
Zhang, X. -G.
Wendelken, J. F.
Plummer, E. W.
Li, An-Ping
TI Imaging and manipulation of the competing electronic phases near the
Mott metal-insulator transition
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Article
DE phase separation; electron microscopy; electron transport; scanning
tunneling microscopy; strongly correlated materials
ID SEPARATION; STATE; INSTABILITY; SR3RU2O7; SUPERCONDUCTIVITY; MANGANITES;
PHYSICS
AB The complex interplay between the electron and lattice degrees of freedom produces multiple nearly degenerate electronic states in correlated electron materials. The competition between these degenerate electronic states largely determines the functionalities of the system, but the invoked mechanism remains in debate. By imaging phase domains with electron microscopy and interrogating individual domains in situ via electron transport spectroscopy in double-layered Sr-3(Ru1-xMnx)(2)O-7 (x - 0 and 0.2), we show in real-space that the microscopic phase competition and the Mott-type metal-insulator transition are extremely sensitive to applied mechanical stress. The revealed dynamic phase evolution with applied stress provides the first direct evidence for the important role of strain effect in both phase separation and Mott metal-insulator transition due to strong electron-lattice coupling in correlated systems.
C1 [Hu, B.; Jin, R.; Plummer, E. W.] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA.
[Kim, Tae-Hwan; Zhang, X. -G.; Wendelken, J. F.; Li, An-Ping] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
[Angst, M.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
RP Plummer, EW (reprint author), Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA.
EM eplummer@utk.edu; apli@ornl.gov
RI Kim, Tae-Hwan/A-5636-2010; Hu, Biao/A-8199-2012; Li,
An-Ping/B-3191-2012; Angst, Manuel/I-4380-2012
OI Kim, Tae-Hwan/0000-0001-5328-0913; Li, An-Ping/0000-0003-4400-7493;
Angst, Manuel/0000-0001-8892-7019
FU Scientific User Facilities Division; Division of Materials Science and
Engineering, Office of Basic Energy Sciences, U.S. Department of Energy;
Department Of Energy [DE-SC0002136]
FX We thank Elbio R. Dagotto, David C. Joy, and Jiandi Zhang for
stimulating discussions. This research at Oak Ridge National
Laboratory's Center for Nanophase Materials Sciences was sponsored by
the Scientific User Facilities Division and Division of Materials
Science and Engineering, Office of Basic Energy Sciences, U.S.
Department of Energy. This work was also partially supported by a
Department Of Energy Grant DE-SC0002136 (to E.W.P.).
NR 29
TC 19
Z9 19
U1 2
U2 28
PU NATL ACAD SCIENCES
PI WASHINGTON
PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA
SN 0027-8424
J9 P NATL ACAD SCI USA
JI Proc. Natl. Acad. Sci. U. S. A.
PD MAR 23
PY 2010
VL 107
IS 12
BP 5272
EP 5275
DI 10.1073/pnas.1000655107
PG 4
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 573GY
UT WOS:000275898300004
PM 20200312
ER
PT J
AU Fleissner, MR
Brustad, EM
Kalai, T
Altenbach, C
Cascio, D
Peters, FB
Hideg, K
Peuker, S
Schultz, PG
Hubbell, WL
AF Fleissner, Mark R.
Brustad, Eric M.
Kalai, Tamas
Altenbach, Christian
Cascio, Duilio
Peters, Francis B.
Hideg, Kalman
Peuker, Sebastian
Schultz, Peter G.
Hubbell, Wayne L.
TI Site-directed spin labeling of a genetically encoded unnatural amino
acid (vol 106, 21637, 2009)
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Correction
C1 [Fleissner, Mark R.; Altenbach, Christian; Hubbell, Wayne L.] Univ Calif Los Angeles, Jules Stein Eye Inst, Los Angeles, CA 90095 USA.
[Fleissner, Mark R.; Altenbach, Christian; Hubbell, Wayne L.] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA.
[Brustad, Eric M.; Peters, Francis B.; Schultz, Peter G.] Scripps Res Inst, Dept Chem, La Jolla, CA 92037 USA.
[Brustad, Eric M.; Peters, Francis B.; Schultz, Peter G.] Scripps Res Inst, Skaggs Inst Chem Biol, La Jolla, CA 92037 USA.
[Kalai, Tamas; Hideg, Kalman] Univ Pecs, Inst Organ & Med Chem, H-7624 Pecs, Hungary.
[Cascio, Duilio] Univ Calif Los Angeles, DOE Inst Genom & Prote, Los Angeles, CA 90095 USA.
[Peuker, Sebastian] CAESAR Res Ctr, D-53175 Bonn, Germany.
RP Fleissner, MR (reprint author), Univ Calif Los Angeles, Jules Stein Eye Inst, Los Angeles, CA 90095 USA.
NR 1
TC 1
Z9 1
U1 1
U2 9
PU NATL ACAD SCIENCES
PI WASHINGTON
PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA
SN 0027-8424
J9 P NATL ACAD SCI USA
JI Proc. Natl. Acad. Sci. U. S. A.
PD MAR 23
PY 2010
VL 107
IS 12
BP 5693
EP 5693
PG 1
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 573GY
UT WOS:000275898300076
ER
PT J
AU Soper, AK
Teixeira, J
Head-Gordon, T
AF Soper, A. K.
Teixeira, J.
Head-Gordon, T.
TI Is ambient water inhomogeneous on the nanometer-length scale?
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Letter
C1 [Soper, A. K.] Rutherford Appleton Lab, Sci & Technol Facil Council, ISIS Facil, Didcot OX11 0QX, Oxon, England.
[Teixeira, J.] CEA Saclay, CNRS, Lab Leon Brillouin, CEA, F-91101 Gif Sur Yvette, France.
[Head-Gordon, T.] Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA.
[Head-Gordon, T.] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
RP Soper, AK (reprint author), Rutherford Appleton Lab, Sci & Technol Facil Council, ISIS Facil, Harwell Sci & Innovat Campus, Didcot OX11 0QX, Oxon, England.
EM alan.soper@stfc.ac.uk
RI Teixeira, Jose/E-6084-2010; Head-Gordon, Teresa/E-5818-2011
NR 5
TC 56
Z9 56
U1 1
U2 31
PU NATL ACAD SCIENCES
PI WASHINGTON
PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA
SN 0027-8424
J9 P NATL ACAD SCI USA
JI Proc. Natl. Acad. Sci. U. S. A.
PD MAR 23
PY 2010
VL 107
IS 12
BP E44
EP E44
DI 10.1073/pnas.0912158107
PG 1
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 573GY
UT WOS:000275898300082
PM 20220097
ER
PT J
AU Zhang, M
Foley, B
Schultz, AK
Macke, JP
Bulla, I
Stanke, M
Morgensterm, B
Korber, B
Leitner, T
AF Zhang, Ming
Foley, Brian
Schultz, Anne-Kathrin
Macke, Jennifer P.
Bulla, Ingo
Stanke, Mario
Morgensterm, Burkhard
Korber, Bette
Leitner, Thomas
TI The role of recombination in the emergence of a complex and dynamic HIV
epidemic
SO RETROVIROLOGY
LA English
DT Article
ID HUMAN-IMMUNODEFICIENCY-VIRUS; CIRCULATING RECOMBINANT; INTERSUBTYPE
RECOMBINANTS; SUBTYPE-C; GENETIC-RECOMBINATION; EVOLUTIONARY HISTORY;
SOUTHERN CHINA; MOLECULAR EPIDEMIOLOGY; REVERSE TRANSCRIPTION; GENOME
SEQUENCES
AB Background: Inter-subtype recombinants dominate the HIV epidemics in three geographical regions. To better understand the role of HIV recombinants in shaping the current HIV epidemic, we here present the results of a large-scale subtyping analysis of 9435 HIV-1 sequences that involve subtypes A, B, C, G, F and the epidemiologically important recombinants derived from three continents.
Results: The circulating recombinant form CRF02_AG, common in West Central Africa, appears to result from recombination events that occurred early in the divergence between subtypes A and G, followed by additional recent recombination events that contribute to the breakpoint pattern defining the current recombinant lineage. This finding also corrects a recent claim that G is a recombinant and a descendant of CRF02, which was suggested to be a pure subtype. The BC and BF recombinants in China and South America, respectively, are derived from recent recombination between contemporary parental lineages. Shared breakpoints in South America BF recombinants indicate that the HIV-1 epidemics in Argentina and Brazil are not independent. Therefore, the contemporary HIV-1 epidemic has recombinant lineages of both ancient and more recent origins.
Conclusions: Taken together, we show that these recombinant lineages, which are highly prevalent in the current HIV epidemic, are a mixture of ancient and recent recombination. The HIV pandemic is moving towards having increasing complexity and higher prevalence of recombinant forms, sometimes existing as "families" of related forms. We find that the classification of some CRF designations need to be revised as a consequence of (1) an estimated > 5% error in the original subtype assignments deposited in the Los Alamos sequence database; (2) an increasing number of CRFs are defined while they do not readily fit into groupings for molecular epidemiology and vaccine design; and (3) a dynamic HIV epidemic context.
C1 [Zhang, Ming] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA.
[Schultz, Anne-Kathrin; Bulla, Ingo; Stanke, Mario; Morgensterm, Burkhard] Inst Mikrobiol & Genet, Abt Bioinformat, D-37077 Gottingen, Germany.
[Korber, Bette] Santa Fe Inst, Santa Fe, NM 87501 USA.
RP Zhang, M (reprint author), Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA.
EM mingzh@lanl.gov; tkl@lanl.gov
RI Morgenstern, Burkhard/A-7486-2008;
OI Foley, Brian/0000-0002-1086-0296; Korber, Bette/0000-0002-2026-5757;
Schultz, Anne-Kathrin/0000-0002-0963-4275
FU NIH-DOE [Y1-AI-8309]
FX We greatly thank to Dr. William Fisher for helpful discussions. This
work was supported by an NIH-DOE interagency agreement (Y1-AI-8309).
NR 70
TC 64
Z9 69
U1 0
U2 5
PU BIOMED CENTRAL LTD
PI LONDON
PA 236 GRAYS INN RD, FLOOR 6, LONDON WC1X 8HL, ENGLAND
SN 1742-4690
J9 RETROVIROLOGY
JI Retrovirology
PD MAR 23
PY 2010
VL 7
AR 25
DI 10.1186/1742-4690-7-25
PG 15
WC Virology
SC Virology
GA 584LW
UT WOS:000276754500002
PM 20331894
ER
PT J
AU Doerk, GS
Radmilovic, V
Maboudian, R
AF Doerk, Gregory S.
Radmilovic, Velimir
Maboudian, Roya
TI Branching induced faceting of Si nanotrees
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE elemental semiconductors; nanofabrication; nanostructured materials;
semiconductor growth; silicon
ID SILICON NANOWIRES; SURFACE MIGRATION; GROWTH; PERFORMANCE; GOLD;
TEMPERATURE; SHAPE
AB The sidewalls of silicon nanotree trunks grown by the vapor-liquid-solid mechanism with branches seeded by Au surface migration are shown to exhibit strong sawtooth nanofaceting in the region of branching. For Si nanowires grown along the << 111 >> direction, facets found after Au surface migration are identified with the {111} and {113} crystallographic planes. These facets differ from those found on the fully synthesized Si nanotrees, which occur on {111} and {100} planes. We hypothesize that the facets found on the nanotrees are composed of the basal structures of the branches and are induced by branch nucleation.
C1 [Doerk, Gregory S.; Maboudian, Roya] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA.
[Radmilovic, Velimir] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
RP Doerk, GS (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA.
EM maboudia@berkeley.edu
FU National Science Foundation [EEC-0832819, DMR-0804646]; Office of
Science, Office of Basic Energy Sciences of the U.S. Department of
Energy [DE-AC02-05CH11231]
FX We acknowledge the support of the National Science Foundation, Grant
Nos. EEC-0832819 and DMR-0804646. This work was performed at NCEM, which
is supported by the Office of Science, Office of Basic Energy Sciences
of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
NR 27
TC 9
Z9 9
U1 2
U2 14
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 22
PY 2010
VL 96
IS 12
AR 123117
DI 10.1063/1.3374328
PG 3
WC Physics, Applied
SC Physics
GA 575OQ
UT WOS:000276077200066
ER
PT J
AU Krusin-Elbaum, L
Shakhvorostov, D
Cabral, C
Raoux, S
Jordan-Sweet, JL
AF Krusin-Elbaum, L.
Shakhvorostov, D.
Cabral, C., Jr.
Raoux, S.
Jordan-Sweet, J. L.
TI Irreversible altering of crystalline phase of phase-change Ge-Sb thin
films
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE antimony compounds; crystal structure; crystallisation; germanium
compounds; laser beam effects; phase change materials; precipitation
(physical chemistry); Raman spectra; thin films
AB The stability of the crystalline phase of binary phase-change Ge(x)Sb(1-x) films is investigated over a wide range of Ge content. From Raman spectroscopy we find the Ge-Sb crystalline structure irreversibly altered after exposure to a laser beam. We show that with increasing beam intensity/temperature Ge agglomerates and precipitates out in the amount growing with x. A simple empirical relation links Ge precipitation temperature T(Ge)(p) to the rate of change dT(cryst)/dx of crystallization, with the precipitation easiest on the mid-range x plateau, where T(cryst) is nearly constant. Our findings point to a preferable 15%less than or similar to x less than or similar to 50% window, that may achieve the desired cycling/archival properties of a phase-change cell.
C1 [Krusin-Elbaum, L.; Cabral, C., Jr.; Raoux, S.; Jordan-Sweet, J. L.] IBM TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA.
[Krusin-Elbaum, L.] CUNY City Coll, Dept Phys, New York, NY 10031 USA.
[Shakhvorostov, D.] Univ Saarland, D-66123 Saarbrucken, Germany.
[Jordan-Sweet, J. L.] Brookhaven Natl Lab, NSLS, Upton, NY 11973 USA.
RP Krusin-Elbaum, L (reprint author), IBM TJ Watson Res Ctr, Yorktown Hts, NY 10598 USA.
EM lia.krusin@gmail.com
RI Raoux, Simone/G-3920-2016
FU U.S. Department of Energy [DE-AC02-98CH10886]
FX This work was carried out in part at Brookhaven National Laboratory,
supported by the U.S. Department of Energy, under Contract No.
DE-AC02-98CH10886.
NR 18
TC 7
Z9 7
U1 0
U2 7
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 22
PY 2010
VL 96
IS 12
AR 121906
DI 10.1063/1.3361656
PG 3
WC Physics, Applied
SC Physics
GA 575OQ
UT WOS:000276077200018
ER
PT J
AU Son, YH
Lee, JK
Soong, Y
Martello, D
Chyu, M
AF Son, You-Hwan
Lee, Jung-Kun
Soong, Yee
Martello, Donald
Chyu, Minking
TI Enhanced magnetic response of fluids using self-assembled petal-like
iron oxide particles
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE iron compounds; magnetic fluids; magnetic particles; nanoparticles;
self-assembly; viscoelasticity
ID SIZE-CONTROLLED SYNTHESIS; MAGNETORHEOLOGICAL FLUIDS; WATER-TREATMENT;
NANOPARTICLES
AB Using self-assembled iron oxide (SAIO) particles with petal-like morphology, aqueous fluids containing magnetic particles were prepared and the effect of hierarchical particle surface on the viscoelasticity under magnetic was investigated. The fluids consisting of self-assembled iron oxide particles exhibit highly tunable viscoelasticity which is controlled by applying external magnetic field. A difference between SAIO particles and spherical particles is explained by the fact that surface features of the self-assembled particles increased the network strength between particles in the fluids.
C1 [Son, You-Hwan; Lee, Jung-Kun; Chyu, Minking] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA.
[Soong, Yee; Martello, Donald] Natl Energy Technol Lab, Pittsburgh, PA 15261 USA.
RP Lee, JK (reprint author), Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA.
EM jul37@pitt.edu
FU U.S. Department of Energy through National Energy Technology Laboratory
(NETL)
FX This work was supported by the U.S. Department of Energy through
National Energy Technology Laboratory (NETL).
NR 18
TC 7
Z9 8
U1 2
U2 13
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 22
PY 2010
VL 96
IS 12
AR 121905
DI 10.1063/1.3371713
PG 3
WC Physics, Applied
SC Physics
GA 575OQ
UT WOS:000276077200017
ER
PT J
AU Su, D
Yang, B
Jiang, N
Sawicki, M
Broadbridge, C
Couillard, M
Reiner, JW
Walker, FJ
Ahn, CH
Zhu, YM
AF Su, Dong
Yang, Bo
Jiang, Nan
Sawicki, M.
Broadbridge, C.
Couillard, M.
Reiner, J. W.
Walker, F. J.
Ahn, C. H.
Zhu, Yimei
TI Valence electron energy-loss spectroscopy of ultrathin SrTiO3 films
grown on silicon (100) single crystal
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE density functional theory; effective mass; electron energy loss spectra;
red shift; silicon; strontium compounds; surface plasmons; valence bands
ID INTERFACE; PLASMONS; SURFACE; BATIO3; OXIDES; SI
AB Valence electron energy-loss spectroscopy is used to investigate the plasmon excitations of ultrathin SrTiO3 sandwiched between amorphous Si and crystalline Si. Two plasmon excitations were observed, one at 15.8 eV and the other at 28.7 eV. Our calculations, based on dielectric-function theory, suggest that the former peak originates from the coupling of the Si layers and is related to the geometry of the structure, and the latter peak results from the SrTiO3 bulk plasmon after a redshift. Our findings demonstrate the value of valence electron energy-loss spectroscopy in detecting a local change in the effective electron mass.
C1 [Su, Dong; Zhu, Yimei] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
[Yang, Bo; Jiang, Nan] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA.
[Sawicki, M.; Broadbridge, C.] So Connecticut State Univ, Dept Phys, New Haven, CT 06515 USA.
[Couillard, M.] McMaster Univ, Dept Mat Sci & Engn, Hamilton, ON L8S 4L7, Canada.
[Couillard, M.] McMaster Univ, Canadian Ctr Electron Microscopy, Hamilton, ON L8S 4L7, Canada.
[Reiner, J. W.; Walker, F. J.; Ahn, C. H.] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA.
[Reiner, J. W.; Walker, F. J.; Ahn, C. H.] Yale Univ, Ctr Res Interface Struct & Phenomena, New Haven, CT 06520 USA.
RP Su, D (reprint author), Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
EM dsu@bnl.gov
RI Su, Dong/A-8233-2013;
OI Su, Dong/0000-0002-1921-6683; Walker, Frederick/0000-0002-8094-249X
FU U.S. Department of Energy BES [DE-AC0298CH10886]; NSF [DMR0603993,
DMR05-20495]
FX The work at Brookhaven was supported by U.S. Department of Energy BES
under Contract No. DE-AC0298CH10886. B.Y. and N.J. would like to
acknowledge the financial support by NSF under Grant No. DMR0603993. The
research of M. S., C. B., J.W.R., C. H. A., and F.J.W. was partially
supported by NSF grant MRSEC under Grant No. DMR05-20495. Use of MRSEC
DMR05-20495 facilities is acknowledged.
NR 24
TC 5
Z9 5
U1 2
U2 16
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 22
PY 2010
VL 96
IS 12
AR 121914
DI 10.1063/1.3364144
PG 3
WC Physics, Applied
SC Physics
GA 575OQ
UT WOS:000276077200026
ER
PT J
AU Wang, K
Chen, JJ
Zeng, ZM
Tarr, J
Zhou, WL
Zhang, Y
Yan, YF
Jiang, CS
Pern, J
Mascarenhas, A
AF Wang, K.
Chen, J. J.
Zeng, Z. M.
Tarr, J.
Zhou, W. L.
Zhang, Y.
Yan, Y. F.
Jiang, C. S.
Pern, J.
Mascarenhas, A.
TI Synthesis and photovoltaic effect of vertically aligned ZnO/ZnS
core/shell nanowire arrays
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE II-VI semiconductors; nanofabrication; nanowires; photoconductivity;
photoluminescence; photovoltaic effects; semiconductor growth;
semiconductor heterojunctions; semiconductor quantum wires; wide band
gap semiconductors; zinc compounds
ID SOLAR-CELLS; OPTICAL-PROPERTIES
AB A vertically aligned ZnO/ZnS core/shell nanowire array with type II band alignment was directly synthesized on an indium-tin-oxide glass substrate and the photovoltaic effect of the nanowire array was investigated. The epitaxial relationship, wurtzite (0001) matching zinc-blende (111), was observed in the ZnO/ZnS nano-heterostructure. ZnS coating is found to quench the photoluminescence of ZnO nanowires but enhance the photocurrent with faster response in the photovoltaic device, indicating improvement in charge separation and collection in the type II core/shell nanowire.
C1 [Wang, K.; Chen, J. J.; Zeng, Z. M.; Tarr, J.; Zhou, W. L.] Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA.
[Zhang, Y.] Univ N Carolina, Dept Elect & Comp Engn, Charlotte, NC 28223 USA.
[Yan, Y. F.; Jiang, C. S.; Pern, J.; Mascarenhas, A.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Zhou, WL (reprint author), Univ New Orleans, Adv Mat Res Inst, New Orleans, LA 70148 USA.
EM wzhou@uno.edu; yong.zhang@uncc.edu
RI Chen, Jiajun/A-9200-2011; Wang, Kai/H-4361-2011; zeng,
zhongming/A-3499-2011; Zhang, Yong/D-3412-2013;
OI Chen, Jiajun/0000-0002-6550-0343; Wang, Kai/0000-0002-6405-7837; Wang,
Kefeng/0000-0002-8449-9720
FU DARPA [HR0011-07-1-0032]; Louisiana Board of Regents [LEQSF
(2008-11)-RD-B-10, LEQSF (2007-12)-ENH-PKSFI-PRS-04]; American Chemical
Society Petroleum Research Fund [48796-DN110]; CRI
FX The work performed at UNO was supported by the DARPA under Grant No.
HR0011-07-1-0032, research grants from Louisiana Board of Regents under
Contract No. LEQSF (2008-11)-RD-B-10 and LEQSF
(2007-12)-ENH-PKSFI-PRS-04, and American Chemical Society Petroleum
Research Fund under PRF No 48796-DN110. The work at UNC-Charlotte was
partially supported by CRI. The authors acknowledge Professor M. Tarr
for polishing the manuscript for English.
NR 21
TC 86
Z9 92
U1 8
U2 112
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 22
PY 2010
VL 96
IS 12
AR 123105
DI 10.1063/1.3367706
PG 3
WC Physics, Applied
SC Physics
GA 575OQ
UT WOS:000276077200054
ER
PT J
AU Zhang, LX
McMahon, WE
Wei, SH
AF Zhang, Lixin
McMahon, W. E.
Wei, Su-Huai
TI Passivation of deep electronic states of partial dislocations in GaAs: A
theoretical study
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE ab initio calculations; deep levels; dislocations; gallium arsenide;
III-V semiconductors; passivation; semiconductor doping
ID INITIO MOLECULAR-DYNAMICS; EPITAXY
AB The structure and electronic properties of reconstructed cores of 90 degrees partial dislocations in GaAs are studied using first-principles methods. We find that a double-period reconstruction is most stable for an As-core whereas a single-period reconstruction is most stable for a Ga-core. We show that As and Ga dimers induce detrimental deep electronic states. These deep levels can be partially removed by introducing passivating dopants that break dimers in the dislocation core.
C1 [Zhang, Lixin; McMahon, W. E.; Wei, Su-Huai] Natl Renewable Energy Lab, Golden, CO 80401 USA.
[Zhang, Lixin] Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China.
RP Zhang, LX (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA.
EM bill.mcmahon@nrel.gov
FU U.S. DOE [DE-AC36-08GO28308]
FX The work at NREL is supported by the U.S. DOE under Contract No.
DE-AC36-08GO28308.
NR 14
TC 10
Z9 10
U1 3
U2 17
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
EI 1077-3118
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 22
PY 2010
VL 96
IS 12
AR 121912
DI 10.1063/1.3364140
PG 3
WC Physics, Applied
SC Physics
GA 575OQ
UT WOS:000276077200024
ER
PT J
AU Zhu, D
Noemaun, AN
Schubert, MF
Cho, J
Schubert, EF
Crawford, MH
Koleske, DD
AF Zhu, Di
Noemaun, Ahmed N.
Schubert, Martin F.
Cho, Jaehee
Schubert, E. Fred
Crawford, Mary H.
Koleske, Daniel D.
TI Enhanced electron capture and symmetrized carrier distribution in GaInN
light-emitting diodes having tailored barrier doping
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE electron capture; gallium compounds; indium compounds; light emitting
diodes; semiconductor doping; semiconductor quantum wells
ID QUANTUM EFFICIENCY; RELAXATION; LEDS; GAN
AB The confinement of electrons to the active region of GaInN light-emitting diodes (LEDs) is limited by the (i) inefficient electron capture into polar quantum wells, (ii) electron-attracting properties of electron-blocking layers (EBL), (iii) asymmetry in electron and hole transport, and (iv) unfavorable p-doping in the EBL for high Al content. To counteract these mechanisms, we employ tailored Si-doping in the quantum barriers (QBs). Experiments show a 37.5% enhancement in light-output power at high currents of one-QB-doped LEDs over all-QB-doped LEDs. These results are consistent with simulations showing that QB doping can be used to symmetrize the electron and hole distribution.
C1 [Zhu, Di; Noemaun, Ahmed N.; Schubert, Martin F.; Cho, Jaehee; Schubert, E. Fred] Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA.
[Zhu, Di; Noemaun, Ahmed N.; Schubert, Martin F.; Cho, Jaehee; Schubert, E. Fred] Rensselaer Polytech Inst, Dept Elect Comp & Syst Engn, Troy, NY 12180 USA.
[Crawford, Mary H.; Koleske, Daniel D.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Schubert, EF (reprint author), Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA.
EM efschubert@rpi.edu
RI Cho, Jaehee/H-3506-2013
OI Cho, Jaehee/0000-0002-8794-3487
FU Sandia's Solid-State Lighting Science Center; U.S. Department of Energy
[DE-AC04-94AL85000]; Sandia Corporation; Lockheed Martin Co.
FX The authors gratefully acknowledge support by Sandia's Solid-State
Lighting Science Center, an Energy Frontier Research Center funded by
the U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences. Sandia is a multiprogram laboratory operated by Sandia
Corporation, a Lockheed Martin Co., for the United States Department of
Energy's National Nuclear Security Administration under Contract No.
DE-AC04-94AL85000. It is also a pleasure to acknowledge technical
support by Professor Jong Kyu Kim at Pohang University of Science and
Technology.
NR 19
TC 30
Z9 31
U1 1
U2 8
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 22
PY 2010
VL 96
IS 12
AR 121110
DI 10.1063/1.3371812
PG 3
WC Physics, Applied
SC Physics
GA 575OQ
UT WOS:000276077200010
ER
PT J
AU Nair, H
Miller, JT
Stach, EA
Baertsch, CD
AF Nair, Hari
Miller, Jeffrey T.
Stach, Eric A.
Baertsch, Chelsey D.
TI Mechanism of dynamic structural reorganization in polyoxometalate
catalysts
SO JOURNAL OF CATALYSIS
LA English
DT Article
DE Phosphomolybdic acid; MPA; Isobutane oxidation; Twinning; Catalyst
reconstruction; Catalyst activation; Thermal degradation; High
resolution transmission electron microscopy
ID KEGGIN-TYPE HETEROPOLYCOMPOUNDS; IN-SITU INVESTIGATIONS; SELECTIVE
OXIDATION; DODECAMOLYBDOPHOSPHORIC ACID; THERMAL-STABILITY; ISOBUTYRIC
ACID; ISOBUTANE; PROPANE; HETEROPOLYACIDS; SPECTROSCOPY
AB Understanding the structural and electronic mechanisms by which catalysts activate and deactivate during use is crucial to the intelligent design of more efficient chemical syntheses. Atomic resolution electron microscopy is used in conjunction with bulk characterization tools including as X-ray Diffraction (XRD), Ultraviolet-visible Diffuse Reflectance Spectroscopy (UV-vis DRS) and X-ray Absorption Spectroscopy (XAS) to understand the activation and deactivation mechanism of dodecamolybdophosphoric acid (MPA), a promising parent material for a class of polyoxometalate catalysts useful for the direct oxidation of isobutene to methacrylic acid. These techniques show that the thermal and reactive reconstruction of MPA arises from the migration of an oxomolybdate species from the cubic form of the anhydrous MPA structure. The reconstruction continues and results in complete degradation to MoO(3), which is inactive for isobutane oxidation. The mechanism by which reorganization occurs is investigated using High Resolution Transmission Electron Microscopy (HR-TEM) for the first time. These HR-TEM studies provide a picture of the atomic-scale rearrangement occurring in the catalyst. The initial structural reorganization in MPA is observed as the formation of annealing twins in the cubic form of the anhydrous polyoxometalate - this twinned structure is believed to be the active form of the catalyst. This twinning phenomenon is believed to originate from vacancies created in the MPA structure by the migration of atoms out of the primary structure. The twins then propagate across the MPA crystal and result in complete degradation of the MPA to MoO(3). (C) 2009 Elsevier Inc. All rights reserved.
C1 [Nair, Hari; Baertsch, Chelsey D.] Purdue Univ, Sch Chem Engn, W Lafayette, IN 47907 USA.
[Nair, Hari; Stach, Eric A.; Baertsch, Chelsey D.] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
[Miller, Jeffrey T.] Argonne Natl Lab, CSE, Argonne, IL 60439 USA.
[Stach, Eric A.] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA.
RP Baertsch, CD (reprint author), Purdue Univ, Sch Chem Engn, 480 Stadium Mall Dr, W Lafayette, IN 47907 USA.
EM baertsch@purdue.edu
RI ID, MRCAT/G-7586-2011; Stach, Eric/D-8545-2011
OI Stach, Eric/0000-0002-3366-2153
FU Bilsland Dissertation Fellowship at Purdue University; American Chemical
Society [PRF 48977-ND5]; Argonne National Labs [8603]; US Department of
Energy, Office of Science, Office of Basic Energy Sciences
[DE-AC02-06CH11357]; MRCAT member institutions
FX H.N. is supported by the Bilsland Dissertation Fellowship at Purdue
University and the American Chemical Society (PRF 48977-ND5).
Synchrotron beam time was supported by Argonne National Labs GUP # 8603.
The use of the Advanced Photon Source (APS) was supported by the US
Department of Energy, Office of Science, Office of Basic Energy
Sciences, under Contract No. DE-AC02-06CH11357. Materials Research
Collaborative Access Team (MRCAT, Sector 10 ID) operations are supported
by the Department of Energy and the MRCAT member institutions. The
authors are extremely grateful to beamline scientists Soma Chattopadhyay
and Tomohiro Shibata (MRCAT) for their assistance. TEM studies were
carried out at the Birck Nanotecnology Center at Purdue University. The
authors gratefully acknowledge Dr. Dmitri Zakharov, Dr. Seung-Min Kim
and Mr. Robert Colby for their assistance.
NR 35
TC 8
Z9 8
U1 2
U2 18
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0021-9517
J9 J CATAL
JI J. Catal.
PD MAR 22
PY 2010
VL 270
IS 1
BP 40
EP 47
DI 10.1016/j.jcat.2009.12.007
PG 8
WC Chemistry, Physical; Engineering, Chemical
SC Chemistry; Engineering
GA 574CN
UT WOS:000275966100007
ER
PT J
AU Batley, JR
Culling, AJ
Kalmus, G
Lazzeroni, C
Munday, DJ
Slater, MW
Wotton, SA
Arcidiacono, R
Bocquet, G
Cabibbo, N
Ceccucci, A
Cundy, D
Falaleev, V
Fidecaro, M
Gatignon, L
Gonidec, A
Kubischta, W
Norton, A
Maier, A
Patel, M
Peters, A
Balev, S
Frabetti, PL
Goudzovski, E
Hristov, P
Kekelidze, V
Kozhuharov, V
Litov, L
Madigozhin, D
Marinova, E
Molokanova, N
Polenkevich, I
Potrebenikov, Y
Stoynev, S
Zinchenko, A
Monnier, E
Swallow, E
Winston, R
Rubin, P
Walker, A
Baldini, W
Ramusino, AC
Dalpiaz, P
Damiani, C
Fiorini, M
Gianoli, A
Martini, M
Petrucci, F
Savrie, M
Scarpa, M
Wahl, H
Calvetti, M
Iacopini, E
Ruggiero, G
Bizzeti, A
Lenti, M
Veltri, M
Behler, M
Eppard, K
Kleinknecht, K
Marouelli, P
Masetti, L
Moosbrugger, U
Morales, CM
Renk, B
Wache, M
Wanke, R
Winhart, A
Coward, D
Dabrowski, A
Martin, TF
Shieh, M
Szleper, M
Velasco, M
Wood, MD
Anzivino, G
Imbergamo, E
Nappi, A
Piccini, M
Raggi, M
Valdata-Nappi, M
Cenci, P
Pepe, M
Petrucci, MC
Cerri, C
Fantechi, R
Collazuol, G
DiLella, L
Lamanna, G
Mannelli, I
Michetti, A
Costantini, F
Doble, N
Fiorini, L
Giudici, S
Pierazzini, G
Sozzi, M
Venditti, S
Bloch-Devaux, B
Cheshkov, C
Cheze, JB
De Beer, M
Derre, J
Marel, G
Mazzucato, E
Peyaud, B
Vallage, B
Holder, M
Ziolkowski, M
Biino, C
Cartiglia, N
Marchetto, F
Bifani, S
Clemencic, M
Lopez, SG
Dibon, H
Jeitler, M
Markytan, M
Mikulec, I
Neuhofer, G
Widhalm, L
AF Batley, J. R.
Culling, A. J.
Kalmus, G.
Lazzeroni, C.
Munday, D. J.
Slater, M. W.
Wotton, S. A.
Arcidiacono, R.
Bocquet, G.
Cabibbo, N.
Ceccucci, A.
Cundy, D.
Falaleev, V.
Fidecaro, M.
Gatignon, L.
Gonidec, A.
Kubischta, W.
Norton, A.
Maier, A.
Patel, M.
Peters, A.
Balev, S.
Frabetti, P. L.
Goudzovski, E.
Hristov, P.
Kekelidze, V.
Kozhuharov, V.
Litov, L.
Madigozhin, D.
Marinova, E.
Molokanova, N.
Polenkevich, I.
Potrebenikov, Yu.
Stoynev, S.
Zinchenko, A.
Monnier, E.
Swallow, E.
Winston, R.
Rubin, P.
Walker, A.
Baldini, W.
Ramusino, A. Cotta
Dalpiaz, P.
Damiani, C.
Fiorini, M.
Gianoli, A.
Martini, M.
Petrucci, F.
Savrie, M.
Scarpa, M.
Wahl, H.
Calvetti, M.
Iacopini, E.
Ruggiero, G.
Bizzeti, A.
Lenti, M.
Veltri, M.
Behler, M.
Eppard, K.
Kleinknecht, K.
Marouelli, P.
Masetti, L.
Moosbrugger, U.
Morales, C. Morales
Renk, B.
Wache, M.
Wanke, R.
Winhart, A.
Coward, D.
Dabrowski, A.
Martin, T. Fonseca
Shieh, M.
Szleper, M.
Velasco, M.
Wood, M. D.
Anzivino, G.
Imbergamo, E.
Nappi, A.
Piccini, M.
Raggi, M.
Valdata-Nappi, M.
Cenci, P.
Pepe, M.
Petrucci, M. C.
Cerri, C.
Fantechi, R.
Collazuol, G.
DiLella, L.
Lamanna, G.
Mannelli, I.
Michetti, A.
Costantini, F.
Doble, N.
Fiorini, L.
Giudici, S.
Pierazzini, G.
Sozzi, M.
Venditti, S.
Bloch-Devaux, B.
Cheshkov, C.
Cheze, J. B.
De Beer, M.
Derre, J.
Marel, G.
Mazzucato, E.
Peyaud, B.
Vallage, B.
Holder, M.
Ziolkowski, M.
Biino, C.
Cartiglia, N.
Marchetto, F.
Bifani, S.
Clemencic, M.
Lopez, S. Goy
Dibon, H.
Jeitler, M.
Markytan, M.
Mikulec, I.
Neuhofer, G.
Widhalm, L.
TI Empirical parameterization of the K-+/- -> pi(+/-)pi(0)pi(0) decay
Dalitz plot
SO PHYSICS LETTERS B
LA English
DT Article
AB As first observed by the NA48/2 experiment at the CERN SPS, the pi(0)pi(0) invariant mass (M-00) distribution from K-+/- -> pi(+/-)pi(0)pi(0) decay shows a cusp-like anomaly at M-00 = 2m(+), where m(+) is the charged pion mass An analysis to extract the pi pi scattering lengths in the isospin I = 0 and I = 2 states. a(0) and a(2), respectively, has been recently reported In the present work the Dahtz plot of this decay is fitted to a new empirical parameterization suitable for practical purposes, such as Monte Carlo simulations of K-+/- -> pi(+/-)pi(0)pi(0) decays (C) 2010 Elsevier B V All rights reserved
C1 [Balev, S.; Frabetti, P. L.; Goudzovski, E.; Hristov, P.; Kekelidze, V.; Kozhuharov, V.; Litov, L.; Madigozhin, D.; Marinova, E.; Molokanova, N.; Polenkevich, I.; Potrebenikov, Yu.; Stoynev, S.; Zinchenko, A.] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
[Batley, J. R.; Culling, A. J.; Kalmus, G.; Lazzeroni, C.; Munday, D. J.; Slater, M. W.; Wotton, S. A.] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England.
[Arcidiacono, R.; Bocquet, G.; Cabibbo, N.; Ceccucci, A.; Cundy, D.; Falaleev, V.; Fidecaro, M.; Gatignon, L.; Gonidec, A.; Kubischta, W.; Norton, A.; Maier, A.; Patel, M.; Peters, A.; Hristov, P.; Fiorini, M.; Cheshkov, C.; Clemencic, M.] CERN, CH-1211 Geneva 23, Switzerland.
[Monnier, E.; Swallow, E.; Winston, R.] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60126 USA.
[Rubin, P.; Walker, A.] Univ Edinburgh, Dept Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland.
[Norton, A.; Baldini, W.; Ramusino, A. Cotta; Dalpiaz, P.; Damiani, C.; Fiorini, M.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrie, M.; Scarpa, M.; Wahl, H.] Univ Ferrara, Dipartmento Fis, I-44100 Ferrara, Italy.
[Norton, A.; Baldini, W.; Ramusino, A. Cotta; Dalpiaz, P.; Damiani, C.; Fiorini, M.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrie, M.; Scarpa, M.; Wahl, H.] Sez INFN Ferrara, I-44100 Ferrara, Italy.
[Calvetti, M.; Iacopini, E.; Ruggiero, G.] Dipartimento Fis Univ, I-50019 Sesto Fiorentino, Italy.
[Calvetti, M.; Iacopini, E.; Ruggiero, G.; Bizzeti, A.; Lenti, M.; Veltri, M.] Sez INFN Firenze, I-50019 Sesto Fiorentino, Italy.
[Behler, M.; Eppard, K.; Kleinknecht, K.; Marouelli, P.; Masetti, L.; Moosbrugger, U.; Morales, C. Morales; Renk, B.; Wache, M.; Wanke, R.; Winhart, A.] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany.
[Stoynev, S.; Coward, D.; Dabrowski, A.; Martin, T. Fonseca; Shieh, M.; Szleper, M.; Velasco, M.; Wood, M. D.] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA.
[Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata-Nappi, M.] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy.
[Marinova, E.; Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata-Nappi, M.; Cenci, P.; Pepe, M.; Petrucci, M. C.] Sez INFN Perugia, I-06100 Perugia, Italy.
[Balev, S.; Ruggiero, G.; Cerri, C.; Fantechi, R.; Collazuol, G.; DiLella, L.; Lamanna, G.; Mannelli, I.; Michetti, A.; Costantini, F.; Fiorini, L.; Giudici, S.; Pierazzini, G.; Sozzi, M.; Venditti, S.] Sez INFN Pisa, I-56100 Pisa, Italy.
[Balev, S.; Ruggiero, G.; Collazuol, G.; DiLella, L.; Lamanna, G.; Mannelli, I.; Michetti, A.] Scuola Normale Super Pisa, I-56100 Pisa, Italy.
[Costantini, F.; Doble, N.; Fiorini, L.; Giudici, S.; Pierazzini, G.; Sozzi, M.; Venditti, S.] Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy.
[Bloch-Devaux, B.; Cheshkov, C.; Cheze, J. B.; De Beer, M.; Derre, J.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.] CEA Saclay, DSM RFU, F-91191 Gif Sur Yvette, France.
[Holder, M.; Ziolkowski, M.] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany.
[Arcidiacono, R.; Biino, C.; Cartiglia, N.; Marchetto, F.; Bifani, S.; Clemencic, M.; Lopez, S. Goy] Sez INFN Torino, I-10125 Turin, Italy.
[Arcidiacono, R.; Bifani, S.; Lopez, S. Goy] Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy.
[Dibon, H.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.] Austrian Acad Sci, Inst Hochenergiephys, A-10560 Vienna, Austria.
[Lazzeroni, C.; Slater, M. W.; Goudzovski, E.] Univ Birmingham, Birmingham B15 2TT, W Midlands, England.
[Cabibbo, N.] Univ Roma La Sapienza, I-00185 Rome, Italy.
[Cabibbo, N.] Sez INFN Roma, I-00185 Rome, Italy.
[Cundy, D.] CNR, Ist Cosmogeofis, I-10133 Turin, Italy.
[Kozhuharov, V.] Sofia Univ St Kliment Ohridski, Fac Phys, Sofia 1164, Bulgaria.
[Monnier, E.] Univ Aix Marseille 2, Ctr Phys Particules Marseille, IN2P3, CNRS, Marseille, France.
[Rubin, P.] George Mason Univ, Dept Phys & Astron, Fairfax, VA 22030 USA.
[Bizzeti, A.] Univ Modena & Reggio Emilia, Dipartimento Fis, I-41100 Modena, Italy.
[Veltri, M.] Univ Urbino, Ist Fis, I-61029 Urbino, Italy.
[Masetti, L.] Univ Bonn, Inst Phys, D-53115 Bonn, Germany.
[Coward, D.] Stanford Univ, SLAC, Menlo Pk, CA 94025 USA.
[Martin, T. Fonseca] Univ London, Egham TW20 0EX, Surrey, England.
[Wood, M. D.] Univ Calif Los Angeles, Los Angeles, CA 90024 USA.
[Raggi, M.] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy.
[Fiorini, L.] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain.
[Bifani, S.] Univ Bern, Inst Theoret Phys, CH-3012 Bern, Switzerland.
[Lopez, S. Goy] Ctr Invest Energet Medioambientales & Tecnol, E-28040 Madrid, Spain.
RP Madigozhin, D (reprint author), Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
RI Cenci, Patrizia/A-4071-2012; Collazuol, Gianmaria/C-5670-2012; Piccini,
Mauro/G-7163-2012; Sozzi, Marco/H-1674-2011; Jeitler,
Manfred/H-3106-2012; Fiorini, Massimiliano/A-5354-2015; Gianoli,
Alberto/H-5544-2015;
OI Bifani, Simone/0000-0001-7072-4854; Collazuol,
Gianmaria/0000-0002-7876-6124; Sozzi, Marco/0000-0002-2923-1465;
Fiorini, Massimiliano/0000-0001-6559-2084; Gianoli,
Alberto/0000-0002-2456-8667; Bloch-Devaux, Brigitte/0000-0002-2463-1232;
Anzivino, Giuseppina/0000-0002-5967-0952
NR 8
TC 8
Z9 8
U1 0
U2 7
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0370-2693
J9 PHYS LETT B
JI Phys. Lett. B
PD MAR 22
PY 2010
VL 686
IS 2-3
BP 101
EP 108
DI 10.1016/j.physletb.2010.02.036
PG 8
WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 579NH
UT WOS:000276377500004
ER
PT J
AU Murayama, H
Jing, S
AF Murayama, Hitoshi
Jing Shu
TI Topological dark matter
SO PHYSICS LETTERS B
LA English
DT Article
ID DYNAMICAL SUPERSYMMETRY BREAKING; SYMMETRY-BREAKING; MAGNETIC MONOPOLES;
DEFECT FORMATION; STRING FORMATION; SUPERFLUID HE-3; LIQUID-CRYSTALS;
TRANSITION; GENERATION; ANALOG
AB Kibble mechanism drastically underestimates the production of point-like topological defects, as confirmed recently in atomic and condensed matter systems If non-thermally produced, they can be cosmological dark matter of mass 1-10 PeV or heavier If thermalized, skyrimon of mass 1-10 TeV is also a viable dark matter candidate, whose decay may explain e(+/-) spectra in cosmic rays recently measured by PAMELA, FERMI, and HESS Collaborations Models that produce magnetic monopoles below the inflation scale, such as Pati-Salam unification, are ruled out unless new annihilation mechanism for monopoles is introduced (C) 2010 Elsevier B V All rights reserved
C1 [Murayama, Hitoshi; Jing Shu] Univ Tokyo, Inst Phys & Math Universe, Kashiwa, Chiba 2778568, Japan.
[Murayama, Hitoshi] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Murayama, Hitoshi] Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA.
RP Jing, S (reprint author), Univ Tokyo, Inst Phys & Math Universe, Kashiwa, Chiba 2778568, Japan.
RI Murayama, Hitoshi/A-4286-2011;
OI Shu, Jing/0000-0001-6569-403X
FU World Premier International Research Center Initiative, MEXT, Japan; US
DOE [DE-AC03-76SF00098]; NSF [PHY-04-57315]; Japan Society for Promotion
of Science (JSPS) [20540257, 21740169]
FX The authors thank Shin'ya Aoki, Koichi Hamaguchi, Tetsuo Hatsuda, Simeon
Hellerman, Masahiro Ibe, Joel Moore, Hai Qian, Masahito Ueda, and
Tsutomu Yanagida for useful discussions. This work was supported in part
by World Premier International Research Center Initiative, MEXT, Japan.
The work of H M. was also supported in part by the US DOE under Contract
DE-AC03-76SF00098, the NSF under grant PHY-04-57315, and the
Grant-in-Aid for scientific research (C) 20540257 from Japan Society for
Promotion of Science (JSPS). The work of J.S. was also supported by the
Grant-in-Aid for scientific research (Young Scientists (B) 21740169)
from JSPS.
NR 53
TC 23
Z9 23
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0370-2693
J9 PHYS LETT B
JI Phys. Lett. B
PD MAR 22
PY 2010
VL 686
IS 2-3
BP 162
EP 165
DI 10.1016/j.physletb.2010.02.037
PG 4
WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 579NH
UT WOS:000276377500014
ER
PT J
AU Barber, MJ
Mangravite, LM
Hyde, CL
Chasman, DI
Smith, JD
McCarty, CA
Li, XH
Wilke, RA
Rieder, MJ
Williams, PT
Ridker, PM
Chatterjee, A
Rotter, JI
Nickerson, DA
Stephens, M
Krauss, RM
AF Barber, Mathew J.
Mangravite, Lara M.
Hyde, Craig L.
Chasman, Daniel I.
Smith, Joshua D.
McCarty, Catherine A.
Li, Xiaohui
Wilke, Russell A.
Rieder, Mark J.
Williams, Paul T.
Ridker, Paul M.
Chatterjee, Aurobindo
Rotter, Jerome I.
Nickerson, Deborah A.
Stephens, Matthew
Krauss, Ronald M.
TI Genome-Wide Association of Lipid-Lowering Response to Statins in
Combined Study Populations
SO PLOS ONE
LA English
DT Article
ID DENSITY-LIPOPROTEIN CHOLESTEROL; CORONARY-ARTERY-DISEASE; TREATMENT
PANEL-III; C-REACTIVE PROTEIN; LOCI; GENE; THERAPY; RISK;
PHARMACOGENOMICS; STRATIFICATION
AB Background: Stains effectively lower total and plasma LDL-cholesterol, but the magnitude of decrease varies among individuals. To identify single nucleotide polymorphisms (SNPs) contributing to this variation, we performed a combined analysis of genome-wide association (GWA) results from three trials of statin efficacy.
Methods and Principal Findings: Bayesian and standard frequentist association analyses were performed on untreated and statin-mediated changes in LDL-cholesterol, total cholesterol, HDL-cholesterol, and triglyceride on a total of 3932 subjects using data from three studies: Cholesterol and Pharmacogenetics (40 mg/day simvastatin, 6 weeks), Pravastatin/Inflammation CRP Evaluation (40 mg/day pravastatin, 24 weeks), and Treating to New Targets (10 mg/day atorvastatin, 8 weeks). Genotype imputation was used to maximize genomic coverage and to combine information across studies. Phenotypes were normalized within each study to account for systematic differences among studies, and fixed-effects combined analysis of the combined sample were performed to detect consistent effects across studies. Two SNP associations were assessed as having posterior probability greater than 50%, indicating that they were more likely than not to be genuinely associated with statin-mediated lipid response. SNP rs8014194, located within the CLMN gene on chromosome 14, was strongly associated with statin-mediated change in total cholesterol with an 84% probability by Bayesian analysis, and a p-value exceeding conventional levels of genome- wide significance by frequentist analysis (P = 1.8x10(-8)). This SNP was less significantly associated with change in LDL-cholesterol (posterior probability = 0.16, P = 4.0x10(-6)). Bayesian analysis also assigned a 51% probability that rs4420638, located in APOC1 and near APOE, was associated with change in LDL-cholesterol.
Conclusions and Significance: Using combined GWA analysis from three clinical trials involving nearly 4,000 individuals treated with simvastatin, pravastatin, or atorvastatin, we have identified SNPs that may be associated with variation in the magnitude of statin-mediated reduction in total and LDL-cholesterol, including one in the CLMN gene for which statistical evidence for association exceeds conventional levels of genome-wide significance.
C1 [Barber, Mathew J.; Stephens, Matthew] Univ Chicago, Dept Human Genet, Chicago, IL 60637 USA.
[Mangravite, Lara M.; Krauss, Ronald M.] Childrens Hosp Oakland, Res Inst, Oakland, CA 94609 USA.
[Hyde, Craig L.; Chatterjee, Aurobindo] Pfizer Global Res & Dev, Stat Applicat, Groton, CT USA.
[Chasman, Daniel I.; Ridker, Paul M.] Brigham & Womens Hosp, Ctr Cardiovasc Dis Prevent, Boston, MA 02115 USA.
[Chasman, Daniel I.; Ridker, Paul M.] Harvard Univ, Sch Med, Boston, MA USA.
[Smith, Joshua D.; Rieder, Mark J.; Nickerson, Deborah A.] Univ Washington, Dept Genome Sci, Seattle, WA 98195 USA.
[McCarty, Catherine A.] Marshfield Clin Res Fdn, Ctr Human Genet, Marshfield, WI USA.
[Li, Xiaohui; Rotter, Jerome I.] Cedars Sinai Med Ctr, Inst Med Genet, Los Angeles, CA USA.
[Wilke, Russell A.] Med Coll Wisconsin, Dept Pharmacol & Toxicol, Milwaukee, WI 53226 USA.
[Wilke, Russell A.] Med Coll Wisconsin, Dept Med, Milwaukee, WI 53226 USA.
[Williams, Paul T.] Ernest Orlando Lawrence Berkeley Natl Lab, Div Life Sci, Berkeley, CA USA.
[Stephens, Matthew] Univ Chicago, Dept Stat, Chicago, IL 60637 USA.
RP Barber, MJ (reprint author), Univ Chicago, Dept Human Genet, Chicago, IL 60637 USA.
EM rkrauss@chori.org
OI Mangravite, Lara/0000-0001-7841-3612
FU National Institutes of Health [U01 HL69757, R01 HG002585, U01 HL084689];
Cedars-Sinai board of governors' chair in medical genetics, NCRR
[MO1-RR00425]; DERC [DK063491]; Donald W. Reynolds Foundation
FX This work was funded by a grant from the National Institutes of Health,
U01 HL69757. Additional support was provided by National Institutes of
Health grants R01 HG002585 and U01 HL084689 (MS), by the Cedars-Sinai
board of governors' chair in medical genetics, NCRR grant MO1-RR00425,
and DERC grant DK063491 (JR) and by a grant from the Donald W. Reynolds
Foundation (PR and DC). These funders had no role in study design, data
collection and analysis, decision to publish, or preparation of the
manuscript. The Treating to New Targets Study (TNT) was funded by Pfizer
and CH and AC are full time employees of Pfizer and were involved in
analysis and interpretation of the data, as well as revisions to the
manuscript.
NR 40
TC 117
Z9 120
U1 0
U2 9
PU PUBLIC LIBRARY SCIENCE
PI SAN FRANCISCO
PA 185 BERRY ST, STE 1300, SAN FRANCISCO, CA 94107 USA
SN 1932-6203
J9 PLOS ONE
JI PLoS One
PD MAR 22
PY 2010
VL 5
IS 3
AR e9763
DI 10.1371/journal.pone.0009763
PG 10
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 573FR
UT WOS:000275894300008
PM 20339536
ER
PT J
AU Lykidis, A
Perez-Pantoja, D
Ledger, T
Mavromatis, K
Anderson, IJ
Ivanova, NN
Hooper, SD
Lapidus, A
Lucas, S
Gonzalez, B
Kyrpides, NC
AF Lykidis, Athanasios
Perez-Pantoja, Danilo
Ledger, Thomas
Mavromatis, Kostantinos
Anderson, Iain J.
Ivanova, Natalia N.
Hooper, Sean D.
Lapidus, Alla
Lucas, Susan
Gonzalez, Bernardo
Kyrpides, Nikos C.
TI The Complete Multipartite Genome Sequence of Cupriavidus necator JMP134,
a Versatile Pollutant Degrader
SO PLOS ONE
LA English
DT Article
ID RALSTONIA-EUTROPHA JMP134(PJP4); ALCALIGENES-EUTROPHUS;
ALCOHOL-DEHYDROGENASE; PSEUDOMONAS-PUTIDA; GENE-CLUSTER;
TETRAHYDROFURFURYL ALCOHOL; COMAMONAS TESTOSTERONI;
MICROBIAL-METABOLISM; 3-CHLOROBENZOIC ACID; PLASMID PJP4
AB Background: Cupriavidus necator JMP134 is a Gram-negative beta-proteobacterium able to grow on a variety of aromatic and chloroaromatic compounds as its sole carbon and energy source.
Methodology/ Principal Findings: Its genome consists of four replicons (two chromosomes and two plasmids) containing a total of 6631 protein coding genes. Comparative analysis identified 1910 core genes common to the four genomes compared (C. necator JMP134, C. necator H16, C. metallidurans CH34, R. solanacearum GMI1000). Although secondary chromosomes found in the Cupriavidus, Ralstonia, and Burkholderia lineages are all derived from plasmids, analyses of the plasmid partition proteins located on those chromosomes indicate that different plasmids gave rise to the secondary chromosomes in each lineage. The C. necator JMP134 genome contains 300 genes putatively involved in the catabolism of aromatic compounds and encodes most of the central ring-cleavage pathways. This strain also shows additional metabolic capabilities towards alicyclic compounds and the potential for catabolism of almost all proteinogenic amino acids. This remarkable catabolic potential seems to be sustained by a high degree of genetic redundancy, most probably enabling this catabolically versatile bacterium with different levels of metabolic responses and alternative regulation necessary to cope with a challenging environment. From the comparison of Cupriavidus genomes, it is possible to state that a broad metabolic capability is a general trait for Cupriavidus genus, however certain specialization towards a nutritional niche (xenobiotics degradation, chemolithoautotrophy or symbiotic nitrogen fixation) seems to be shaped mostly by the acquisition of "specialized" plasmids.
Conclusions/Significance: The availability of the complete genome sequence for C. necator JMP134 provides the groundwork for further elucidation of the mechanisms and regulation of chloroaromatic compound biodegradation.
C1 [Lykidis, Athanasios; Mavromatis, Kostantinos; Anderson, Iain J.; Ivanova, Natalia N.; Hooper, Sean D.; Lapidus, Alla; Lucas, Susan; Kyrpides, Nikos C.] US DOE, Joint Genome Inst, Walnut Creek, CA USA.
[Perez-Pantoja, Danilo; Ledger, Thomas; Gonzalez, Bernardo] Pontificia Univ Catolica Chile, NM PFG, NM EMBA,Fac Ciencias Biol, Dept Mol Genet & Microbiol, Santiago, Chile.
[Perez-Pantoja, Danilo; Ledger, Thomas; Gonzalez, Bernardo] Pontificia Univ Catolica Chile, CASEB, Santiago, Chile.
[Ledger, Thomas; Gonzalez, Bernardo] Univ Adolfo Ibanez, Fac Ingn & Ciencia, Santiago, Chile.
RP Lykidis, A (reprint author), US DOE, Joint Genome Inst, Walnut Creek, CA USA.
EM alykidis@lbl.gov
RI Lapidus, Alla/I-4348-2013; Kyrpides, Nikos/A-6305-2014
OI Lapidus, Alla/0000-0003-0427-8731; Kyrpides, Nikos/0000-0002-6131-0462
FU US Department of Energy's Office of Science; University of California,
Lawrence Livermore National Laboratory [W-7405-Eng-48]; Lawrence
Berkeley National Laboratory [DE-AC02-05CH11231]; Los Alamos National
Laboratory [DE-AC02-06NA25396]; FONDECYT [1070343]; Millennium Nuclei
[P/04-007-F, P/06-009-F]; research program FONDAP [1501-0001]; [PBCT
RED-12]
FX The work presented in this article was performed under the auspices of
the US Department of Energy's Office of Science, Biological and
Environmental Research Program and by the University of California,
Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48,
Lawrence Berkeley National Laboratory under contract No.
DE-AC02-05CH11231 and Los Alamos National Laboratory under contract No.
DE-AC02-06NA25396. The funders had no role in study design, data
collection and analysis, decision to publish, or preparation of the
manuscript. Additional support from the FONDECYT grant 1070343; the
Millennium Nuclei grants P/04-007-F and P/06-009-F; the research program
FONDAP 1501-0001 and the grant PBCT RED-12 is acknowledged. D. P. P. is
a CONICYT-DAAD PhD fellow.
NR 66
TC 39
Z9 40
U1 4
U2 24
PU PUBLIC LIBRARY SCIENCE
PI SAN FRANCISCO
PA 185 BERRY ST, STE 1300, SAN FRANCISCO, CA 94107 USA
SN 1932-6203
J9 PLOS ONE
JI PLoS One
PD MAR 22
PY 2010
VL 5
IS 3
AR e9729
DI 10.1371/journal.pone.0009729
PG 13
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 573FR
UT WOS:000275894300005
PM 20339589
ER
PT J
AU Abdelsayed, V
Gardner, T
AF Abdelsayed, Victor
Gardner, Todd
TI Catalytic cycloaddition of CO2 to epoxide over Pt nanoparticles
supported on self-assembled coordination polymers
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 Parsons RDS LLC, Morgantown, WV USA.
US DOE, Natl Energy Technol Lab, Morgantown, WV USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 492-POLY
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189304822
ER
PT J
AU Addy, SEA
Gadgil, A
Kostecki, R
Srinivasan, V
AF Addy, Susan E. A.
Gadgil, Ashok
Kostecki, Robert
Srinivasan, Venkat
TI Affordable arsenic removal from Bangladesh groundwater with
electrocoagulation: Preliminary results
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 Univ Calif Berkeley, Dept Civil & Environm Engn, Berkeley, CA 94720 USA.
Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA.
NR 0
TC 0
Z9 0
U1 1
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 176-ANYL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189300288
ER
PT J
AU Aleksandrov, HA
Zhao, ZJ
Basaran, D
Moskaleva, LV
Chen, ZX
Mei, DH
Roesch, N
AF Aleksandrov, Hristiyan A.
Zhao, Zhi-Jian
Basaran, Duygu
Moskaleva, Lyudmila V.
Chen, Zhao-Xu
Mei, Donghai
Roesch, Notker
TI Mechanistic study of ethylene conversion to ethylidyne on M(111) (M =
Pd, Pt) with DFT and kinetic Monte Carlo simulations
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 TU Muenchen, Catalysis Res Ctr, Garching, Germany.
TU Muenchen, Dept Chem, Garching, Germany.
Univ Sofia, Fac Chem, BU-1126 Sofia, Bulgaria.
Univ Bremen, Inst Angew & Phys Chem, Bremen, Germany.
Nanjing Univ, Inst Theoret & Computat Chem, Nanjing, Jiangsu, Peoples R China.
Pacific NW Natl Lab, Inst Interfacial Catalysis, Richland, WA 99352 USA.
RI Moskaleva, Lyudmila/D-1889-2012; Aleksandrov, Hristiyan/R-4055-2016
OI Moskaleva, Lyudmila/0000-0003-0168-7126;
NR 0
TC 0
Z9 0
U1 1
U2 6
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 233-FUEL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189302540
ER
PT J
AU Allotta, PM
Stair, PC
AF Allotta, Paula M.
Stair, Peter C.
TI Ultraviolet-Raman studies of coke formation during hydrocarbon
conversion over zeolite catalysts
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 Northwestern Univ, Dept Chem, Evanston, IL USA.
Northwestern Univ, Ctr Catalysis & Surface Sci, Evanston, IL 60208 USA.
Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA.
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 49-PETR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189304173
ER
PT J
AU Alnajjar, M
AF Alnajjar, Mikhail
TI Handling pyrophoric reagents
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 [Alnajjar, Mikhail] Pacific NW Natl Lab, Richland, WA 99352 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 4-CHAS
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189301122
ER
PT J
AU Alp, EE
AF Alp, Esen Ercan
TI Unique aspects of nuclear resonance spectroscopy as a probe of
vibrations
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 [Alp, Esen Ercan] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 631-INOR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189303260
ER
PT J
AU Amirav, L
Alivisatos, PA
AF Amirav, Lilac
Alivisatos, Paul A.
TI Photocatalytic hydrogen production with tunable nanorod heterostructures
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
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DT Meeting Abstract
C1 Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA.
NR 0
TC 0
Z9 0
U1 1
U2 11
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 124-PHYS
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189304199
ER
PT J
AU Amonette, JE
Nachimuthu, P
Russell, CK
Baer, DR
Tratnyek, PG
Dohnalkova, A
Wang, CM
Nurmi, JT
AF Amonette, James E.
Nachimuthu, Ponnusamy
Russell, Colleen K.
Baer, Donald R.
Tratnyek, Paul G.
Dohnalkova, Alice
Wang, Chongmin
Nurmi, James T.
TI Adsorbate effects on aqueous oxidation of nano-sized zerovalent iron
particles
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 Pacific NW Natl Lab, Div Fundamental & Computat Sci, Richland, WA 99352 USA.
Pacific NW Natl Lab, Environm & Mol Sci Lab, Richland, WA 99352 USA.
Oregon Hlth & Sci Univ, Div Environm & Biomol Syst, Beaverton, OR USA.
RI Baer, Donald/J-6191-2013
OI Baer, Donald/0000-0003-0875-5961
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 12-COLL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189301822
ER
PT J
AU Angelici, RJ
AF Angelici, Robert J.
TI Catalysis by bulk gold metal (non-nanogold)
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 [Angelici, Robert J.] Iowa State Univ, Ames Lab, Ames, IA USA.
[Angelici, Robert J.] Iowa State Univ, Dept Chem, Ames, IA USA.
NR 2
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 107-CATL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189300744
ER
PT J
AU Arachchige, I
Ivanov, S
AF Arachchige, Indika
Ivanov, Sergei
TI New approach toward the synthesis of small luminescent gold clusters
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 [Arachchige, Indika; Ivanov, Sergei] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM USA.
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 1340-INOR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189303043
ER
PT J
AU Atcher, RW
AF Atcher, Robert W.
TI Challenges for using Actinium-225 in radionuclide therapy
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 Los Alamos Natl Lab, Biosci Div, Los Alamos, NM USA.
Univ New Mexico, Coll Pharm, Albuquerque, NM 87131 USA.
NR 0
TC 0
Z9 0
U1 1
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 181-NUCL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189303610
ER
PT J
AU Atoms, ND
Gordon, MS
Windus, TL
AF Atoms, Nicholas D.
Gordon, Mark S.
Windus, Theresa L.
TI Sampling pre-critical clusters in a sulfuric acid aerosol
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
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DT Meeting Abstract
C1 Iowa State Univ, Dept Chem, Ames, IA USA.
Ames Lab, Ames, IA USA.
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 111-COMP
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189302078
ER
PT J
AU Baker, RT
Hanson, SK
Gordon, JG
Thorn, DL
Crisci, A
Scott, SL
Borden, WT
Dong, H
AF Baker, R. Tom
Hanson, Susan K.
Gordon, John G.
Thorn, David L.
Crisci, Anthony
Scott, Susannah L.
Borden, Weston T.
Dong, Hao
TI Aerobic oxidation of biomass-derived polyalcohols and lignin analogs
using oxovanadium complexes
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
C1 Univ Ottawa, Dept Chem, Ottawa, ON, Canada.
Univ Ottawa, Ctr Catalysis Res & Innovat, Ottawa, ON, Canada.
Los Alamos Natl Lab, Div Chem, Los Alamos, NM USA.
Univ Calif Santa Barbara, Dept Chem Engn, Santa Barbara, CA 93106 USA.
Univ N Texas, Dept Chem, Denton, TX 76203 USA.
NR 0
TC 0
Z9 0
U1 0
U2 3
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 21
PY 2010
VL 239
MA 93-INOR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA V21DW
UT WOS:000208189303377
ER
EF