FN Thomson Reuters Web of Science™
VR 1.0
PT J
AU Cardoso, MB
Luckarift, HR
Urban, VS
O'Neill, H
Johnson, GR
AF Cardoso, Mateus B.
Luckarift, Heather R.
Urban, Volker S.
O'Neill, Hugh
Johnson, Glenn R.
TI Protein Localization in Silica Nanospheres Derived via Biomimetic
Mineralization
SO ADVANCED FUNCTIONAL MATERIALS
LA English
DT Article
ID SMALL-ANGLE NEUTRON; X-RAY-SCATTERING; PARTICLE-SIZE DISTRIBUTIONS;
PRECIPITATING PEPTIDES; STRUCTURAL BIOLOGY; LYSOZYME; COMPLEXES; SANS;
CONFORMATION; NUCLEATION
AB Lysozyme-templated precipitation of silica synthesized by sol-gel chemistry produces a composite material with-antimicrobial properties. This study investigates the structural properties of the composite material that allow for retention of the antimicrobial activity of lysozyme. Scanning (SEM) and transmission (TEM) electron microscopy reveal that the composite has a hierarchical structure composed of quasi-spherical structures (similar to 450 nm diameter), which are in turn composed of closely packed spherical structures of similar to 8-10 nm in diameter. Using small-angle neutron scattering (SANS) with contrast variation, the scattering signatures of the lysozyme and silica within the composite were separated. It was determined that the lysozyme molecules are spatially correlated in the material and form clusters with colloidal silica particles. The size of the clusters determined by SANS agrees well with the structural architecture observed by TEM. BET analysis revealed that the surface area the composite is relatively low (4.73 m(2)/g). However, after removal of the protein by heating to 200 degrees C, the surface area is increased by similar to 20%. In addition to demonstrating a well organized sol-gel synthesis which. generates a functional Material with antimicrobial applications, the analysis and modeling approaches described herein can be used for characterizing a wide range of mesoporous and ultrastructural materials.
C1 [Luckarift, Heather R.; Johnson, Glenn R.] USAF, Res Lab, AFRL RXQL, Mat Sci Directorate, Tyndall AFB, FL 32403 USA.
[Luckarift, Heather R.] Univ Technol Corp, Dayton, OH 45432 USA.
[Cardoso, Mateus B.; Urban, Volker S.; O'Neill, Hugh] Oak Ridge Natl Lab, Div Chem Sci, Ctr Struct Mol Biol, Oak Ridge, TN 37831 USA.
RP Cardoso, MB (reprint author), LNLS, Caixa Postal 6192, BR-13083970 Campinas, SP, Brazil.
EM oneillhm@ornl.gov; Glenn.Johnson@tyndall.af.mil
RI Cardoso, Mateus/A-7926-2015; Urban, Volker/N-5361-2015;
OI Cardoso, Mateus/0000-0003-2102-1225; Urban, Volker/0000-0002-7962-3408;
O'Neill, Hugh/0000-0003-2966-5527
FU AFRL-Materials and Manufacturing directorate; Defense Threat Reduction
Agency-Joint Science and Technology Office [AA06CBT008]; ORNL; Office of
Biological and Environmental Research, U. S. Department of Energy; U.S.
Department of Energy [DE-AC05-00OR22725]; Capes, Brazil
FX The authors acknowledge Dr. Tammy Metroke (Universal Technology
Corporation at the Air Force Research Laboratory, Tyndall AFB, FL) for
assistance with adsorption/desorption isotherms and BET measurements and
to Karen Kelley (University of Florida, Gainesville, Florida) for SEM
and TEM images provided as a service through ICBR Electron Microscopy
BioImaging Lab. The Air Force Research Laboratory (AFRL) work was
supported by the funding from the AFRL-Materials and Manufacturing
directorate and the Defense Threat Reduction Agency-Joint Science and
Technology Office (Project Code AA06CBT008 (Jennifer Becker, Ilya
Elashvili, and Stephen Lee, Program Managers). Research at Oak Ridge
National Laboratory (ORNL) was sponsored by the Laboratory Directed
Research and Development Program of ORNL. The authors also acknowledge
support from ORNL's Center for Structural Molecular Biology (CSMB) that
is supported by the Office of Biological and Environmental Research, U.
S. Department of Energy. This manuscript has been coauthored by
UT-Battelle, LLC, under Contract No. DE-AC05-00OR22725 with the U.S.
Department of Energy. M.B.C. thanks Capes, Brazil for research support.
NR 44
TC 23
Z9 23
U1 0
U2 45
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY
SN 1616-301X
J9 ADV FUNCT MATER
JI Adv. Funct. Mater.
PD SEP 23
PY 2010
VL 20
IS 18
BP 3031
EP 3038
DI 10.1002/adfm.201000144
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 663SL
UT WOS:000282910000006
ER
PT J
AU Comstock, DJ
Christensen, ST
Elam, JW
Pellin, MJ
Hersam, MC
AF Comstock, David J.
Christensen, Steven T.
Elam, Jeffrey W.
Pellin, Michael J.
Hersam, Mark C.
TI Tuning the Composition and Nanostructure of Pt/Ir Films via Anodized
Aluminum Oxide Templated Atomic Layer Deposition
SO ADVANCED FUNCTIONAL MATERIALS
LA English
DT Article
ID THIN-FILMS; MESOPOROUS PLATINUM; POROUS ALUMINA; SOLAR-CELLS;
ALLOY-FILMS; GROWTH; ARRAYS; ELECTROOXIDATION; NANOMATERIALS;
ELECTRODEPOSITION
AB Nanostructured metal films have been widely studied for their roles in sensing, catalysis, and energy storage. In this work, the synthesis of compositionally controlled and nanostructured Pt/Ir films by atomic layer deposition (ALD) into porous anodized aluminum oxide templates is demonstrated. Templated ALD provides advantages over alternative synthesis techniques, including improved film uniformity and conformality as well as atomic-scale control over morphology and composition. Nanostructured Pt ALD films are demonstrated with morphological control provided by the Pt precursor exposure time and the number of ALD cycles. With these approaches, Pt films with enhanced surface areas, as characterized by roughness factors as large as 310, are reproducibly synthesized. Additionally, nanostructured PtIr alloy films of controlled composition and morphology are demonstrated by templated ALD, with compositions varying systematically from pure Pt to pure Ir. Lastly, the application of nanostructured Pt films to electrochemical sensing applications is demonstrated by the non-enzymatic sensing of glucose.
C1 [Comstock, David J.; Hersam, Mark C.] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA.
[Christensen, Steven T.; Elam, Jeffrey W.] Argonne Natl Lab, Div Energy Syst, Argonne, IL 60439 USA.
[Pellin, Michael J.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Pellin, Michael J.; Hersam, Mark C.] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA.
RP Comstock, DJ (reprint author), Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA.
EM m-hersam@northwestern.edu
RI Hersam, Mark/B-6739-2009; Pellin, Michael/B-5897-2008
OI Pellin, Michael/0000-0002-8149-9768
FU Army Research Office (ARO) [W911NF-05-1-0177]; National Science
Foundation (NSF) [ECS-0609064]; NSF-NSEC; NSF-MRSEC; Keck Foundation;
State of Illinois; Northwestern University; NDSEG Fellowship; U.S.
Department of Energy Office of Science Laboratory [DE-AC02-06CH11357]
FX This work was supported by the Army Research Office (ARO
W911NF-05-1-0177) and the National Science Foundation (NSF ECS-0609064).
This research made use of public facilities within the NUANCE Center at
Northwestern University. The NUANCE Center is supported by NSF-NSEC,
NSF-MRSEC, Keck Foundation, the State of Illinois, and Northwestern
University. D. J. Comstock further acknowledges support from an NDSEG
Fellowship. Argonne National Laboratory (ANL) is a U.S. Department of
Energy Office of Science Laboratory operated under Contract No.
DE-AC02-06CH11357 by UChicago Argonne, LLC.
NR 49
TC 34
Z9 35
U1 0
U2 38
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA POSTFACH 101161, 69451 WEINHEIM, GERMANY
SN 1616-301X
EI 1616-3028
J9 ADV FUNCT MATER
JI Adv. Funct. Mater.
PD SEP 23
PY 2010
VL 20
IS 18
BP 3099
EP 3105
DI 10.1002/adfm.201000389
PG 7
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 663SL
UT WOS:000282910000014
ER
PT J
AU Bergenstrahle, M
Wohlert, J
Himmel, ME
Brady, JW
AF Bergenstrahle, Malin
Wohlert, Jakob
Himmel, Michael E.
Brady, John W.
TI Simulation studies of the insolubility of cellulose
SO CARBOHYDRATE RESEARCH
LA English
DT Article
DE Cellulase; Cellobiohydrolase I; Cellulose; Computer modeling; Molecular
dynamics
ID NEUTRON FIBER DIFFRACTION; HYDROGEN-BONDING SYSTEM; MOLECULAR-DYNAMICS
SIMULATIONS; SYNCHROTRON X-RAY; I-BETA; FORCE-FIELD; CRYSTAL-STRUCTURE;
AQUEOUS-SOLUTION; D-GLUCOSE; ENERGY
AB Molecular dynamics simulations have been used to calculate the potentials of mean force for separating short cellooligomers in aqueous solution as a means of estimating the contributions of hydrophobic stacking and hydrogen bonding to the insolubility of crystalline cellulose. A series of four potential of mean force (pmf) calculations for glucose, cellobiose, cellotriose, and cellotetraose in aqueous solution were performed for situations in which the molecules were initially placed with their hydrophobic faces stacked against one another, and another for the cases where the molecules were initially placed adjacent to one another in a co-planar, hydrogen-bonded arrangement, as they would be in cellulose ID. From these calculations, it was found that hydrophobic association does indeed favor a crystal-like structure over solution, as might be expected. Somewhat more surprisingly, hydrogen bonding also favored the crystal packing, possibly in part because of the high entropic cost for hydrating glucose hydroxyl groups, which significantly restricts the configurational freedom of the hydrogen-bonded waters. The crystal was also favored by the observation that there was no increase in chain configurational entropy upon dissolution, because the free chain adopts only one conformation, as previously observed, but against intuitive expectations, apparently due to the persistence of the intramolecular O3-O5 hydrogen bond. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Bergenstrahle, Malin; Wohlert, Jakob; Brady, John W.] Cornell Univ, Dept Food Sci, Ithaca, NY 14853 USA.
[Himmel, Michael E.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Brady, JW (reprint author), Cornell Univ, Dept Food Sci, Ithaca, NY 14853 USA.
EM jwb7@cornell.edu
FU DOE Office of Science, Office of Biological and Environmental Research
through the BioEnergy Science Center (BESC), a DOE Bioenergy Research
Center; Sweden-America Foundation
FX The authors thank P.E. Mason, D.B. Wilson, and P.I. Hansen for helpful
discussions. This work was supported by the DOE Office of Science,
Office of Biological and Environmental Research through the BioEnergy
Science Center (BESC), a DOE Bioenergy Research Center. M.B. and J.W.
also thank the Sweden-America Foundation for financial support.
NR 46
TC 69
Z9 69
U1 6
U2 58
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0008-6215
EI 1873-426X
J9 CARBOHYD RES
JI Carbohydr. Res.
PD SEP 23
PY 2010
VL 345
IS 14
BP 2060
EP 2066
DI 10.1016/j.carres.2010.06.017
PG 7
WC Biochemistry & Molecular Biology; Chemistry, Applied; Chemistry, Organic
SC Biochemistry & Molecular Biology; Chemistry
GA 671DW
UT WOS:000283481500010
PM 20705283
ER
PT J
AU Nielsen, IMB
Leung, K
AF Nielsen, Ida M. B.
Leung, Kevin
TI Cobalt-Porphyrin Catalyzed Electrochemical Reduction of Carbon Dioxide
in Water. 1. A Density Functional Study of Intermediates
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID MOLECULAR-ORBITAL METHODS; TOTAL-ENERGY CALCULATIONS; GAS-DIFFUSION
ELECTRODES; GAUSSIAN-BASIS SETS; WAVE BASIS-SET; ORGANIC-MOLECULES;
REACTION PATHWAYS; CO2 REDUCTION; AXIAL LIGAND; COMPLEXES
AB The reduction of carbon dioxide by cobalt porphyrins is thought to be a multistep reaction with several possible intermediates and reaction pathways. We here investigate a number of possible intermediates in this reaction using density functional theory, including both hybrid (B3LYP) and pure (PBE and B1586) functionals. Optimum structures are located, and harmonic vibrational frequencies and thermal corrections are computed for the low-lying electronic states for all intermediates. Free energies of solvation are predicted for all species, providing a reaction profile in the aqueous phase, which enables identification of likely pathways. Finally, the reaction energy for the binding of carbon dioxide to the cobalt porphine cation is determined in the gas phase and in solution.
C1 [Leung, Kevin] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Nielsen, Ida M. B.] Sandia Natl Labs, Livermore, CA 94551 USA.
RP Leung, K (reprint author), Sandia Natl Labs, MS 1415, Albuquerque, NM 87185 USA.
EM kleung@sandia.gov
FU Department of Energy [DE-AC04-94AL85000]; U.S. Department of Energy
FX Acknowledgment. We thank Craig Medforth, John Shelnutt, Susan Rempe, and
Bryan Wong for useful discussions. This work was supported by the
Department of Energy under Contract DE-AC04-94AL85000, by Sandia's LDRD
program. Sandia is a multiprogram laboratory operated by Sandia
Corporation, a Lockheed Martin Company, for the U.S. Department of
Energy.
NR 58
TC 28
Z9 28
U1 7
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 SEP 23
PY 2010
VL 114
IS 37
BP 10166
EP 10173
DI 10.1021/jp101180m
PG 8
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 649FP
UT WOS:000281753800026
PM 20687540
ER
PT J
AU Leung, K
Nielsen, IMB
Sai, N
Medforth, C
Shelnutt, JA
AF Leung, Kevin
Nielsen, Ida M. B.
Sai, Na
Medforth, Craig
Shelnutt, John A.
TI Cobalt-Porphyrin Catalyzed Electrochemical Reduction of Carbon Dioxide
in Water. 2. Mechanism from First Principles
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID DENSITY-FUNCTIONAL THEORY; PARRINELLO MOLECULAR-DYNAMICS; TOTAL-ENERGY
CALCULATIONS; GAS-DIFFUSION ELECTRODES; WAVE BASIS-SET;
AQUEOUS-SOLUTION; CO2 REDUCTION; NUCLEOPHILIC-ATTACK; REACTION PATHWAYS;
REDOX POTENTIALS
AB We apply first principles computational techniques to analyze the two-electron, multistep, electrochemical reduction of CO(2) to CO in water using cobalt porphyrin as a catalyst. Density functional theory calculations with hybrid functionals and dielectric continuum solvation are used to determine the steps at which electrons are added. This information is corroborated with ab initio molecular dynamics simulations in an explicit aqueous environment which reveal the critical role of water in stabilizing a key intermediate formed by CO(2) bound to cobalt. By use of potential of mean force calculations, the intermediate is found to spontaneously accept a proton to form a carboxylate acid group at pH < 9.0, and the subsequent cleavage of a C-OH bond to form CO is exothermic and associated with a small free energy barrier. These predictions suggest that the proposed reaction mechanism is viable if electron transfer to the catalyst is sufficiently fast. The variation in cobalt ion charge and spin states during bond breaking, DFT+U treatment of cobalt 3d orbitals, and the need for computing electrochemical potentials are emphasized.
C1 [Leung, Kevin; Shelnutt, John A.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Nielsen, Ida M. B.] Sandia Natl Labs, Livermore, CA 94551 USA.
[Sai, Na] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA.
[Medforth, Craig] Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87131 USA.
RP Leung, K (reprint author), Sandia Natl Labs, MS 1415, Albuquerque, NM 87185 USA.
RI Shelnutt, John/A-9987-2009; Medforth, Craig/D-8210-2013; REQUIMTE,
FMN/M-5611-2013; REQUIMTE, UCIBIO/N-9846-2013
OI Shelnutt, John/0000-0001-7368-582X; Medforth, Craig/0000-0003-3046-4909;
FU Department of Energy [DE-AC04-94AL85000]; U.S. Department of Energy
FX We thank Nicola Marzari and Heather Kulik for their input on the
self-consistent DFT+U method and Martijn Marsman for the Wannier
function VASP module. We also thank Hank Westridge, Rick Muller, and the
principal investigators, students, and postdocs involved in this
National Institute of Nano Engineering LDRD project at Sandia, including
Nicola Spaldin, Graeme Henkelman, Jim Miller, Tiffany Hayes, Elise Li,
Zachary Pollack, and Yujiang Song. This work was supported by the
Department of Energy under Contract DE-AC04-94AL85000. Sandia is a
multiprogram laboratory operated by Sandia Corporation, a Lockheed
Martin Company, for the U.S. Department of Energy.
NR 110
TC 41
Z9 41
U1 10
U2 93
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 SEP 23
PY 2010
VL 114
IS 37
BP 10174
EP 10184
DI 10.1021/jp1012335
PG 11
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 649FP
UT WOS:000281753800027
PM 20726563
ER
PT J
AU Mebs, S
Grabowsky, S
Forster, D
Kickbusch, R
Hartl, M
Daemen, LL
Morgenroth, W
Luger, P
Paulus, B
Lentz, D
AF Mebs, Stefan
Grabowsky, Simon
Foerster, Diana
Kickbusch, Rainer
Hartl, Monika
Daemen, Luke L.
Morgenroth, Wolfgang
Luger, Peter
Paulus, Beate
Lentz, Dieter
TI Charge Transfer via the Dative N-B Bond and Dihydrogen Contacts.
Experimental and Theoretical Electron Density Studies of Small Lewis
Acid-Base Adducts
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID DONOR-ACCEPTOR COMPLEXES; HYDROGEN-BONDS; AB-INITIO; TOPOLOGICAL
ANALYSIS; AMMONIA-BORANE; HARTREE-FOCK; NEUTRON-DIFFRACTION;
MOLECULAR-CRYSTALS; BH3NH3; DEHYDROGENATION
AB The electronic characteristics of the dative N-B bond in three Lewis acid-base adducts, hydrazine borane, hydrazine bisborane, and ammonia trifluoroborane, are analyzed by an approach combining experimental electron density determination with a broad variety of theoretical calculations. Special focus is directed to the weak dihydrogen contacts in hydrazine borane. The Atoms In Molecules partitioning scheme is complemented by additional methods like the Source Function, and the Electron Localizability Indicator. For the multipole-free theoretical models of hydrazine borane and hydrazine bisborane, a weak charge donation from Lewis base to acid of about 0.05 e is found, whereas multipole refinement of theoretical and experimental structure factors resulted in opposite signs for the Lewis acid and base fragments. For ammonia trifluoroborane, the donation from Lewis base to acid is slightly larger (about 0.13 e) in the multipole-free models, and the charges obtained by multipole refinement retain the direction of the charge donation but show quite large variations. The natural population analysis charges predict larger charge donations (similar to 0.35 e) from the Lewis bases to the acids for the three title complexes. Although the three compounds exhibit intermolecular interactions of different types and strengths, including classical hydrogen bonds, F center dot center dot center dot H contacts and the already mentioned dihydrogen bonds, almost no charge transfer is detected between different molecules within the crystal environment. The main electronic effect of the formation of the Lewis acid-base adducts and of the crystallization is an increase in the charge separation within the ammonia/hydrazine fragments, which is supported by all investigated bond and atomic properties. The nature of the dative N-B bond is found to be mainly electrostatic, but with a substantial contribution of covalency. The F-B bonds show similarities and differences from the N-B bonds, which makes a distinction of coordinative (or dative) bonds from polar covalent interactions possible.
C1 [Mebs, Stefan; Grabowsky, Simon; Foerster, Diana; Kickbusch, Rainer; Luger, Peter; Lentz, Dieter] Free Univ Berlin, Inst Chem & Biochem Anorgan Chem, D-14195 Berlin, Germany.
[Morgenroth, Wolfgang] Goethe Univ Frankfurt, Facheinheit Mineral Abt Kristallog, Inst Geowissensch, D-60438 Frankfurt, Germany.
[Hartl, Monika; Daemen, Luke L.] Los Alamos Natl Lab, LANSCE, Los Alamos, NM USA.
[Paulus, Beate] Free Univ Berlin, Inst Chem & Biochem Phys & Theoret Chem, D-14195 Berlin, Germany.
RP Lentz, D (reprint author), Free Univ Berlin, Inst Chem & Biochem Anorgan Chem, Fabeckstr 34-36, D-14195 Berlin, Germany.
EM lentz@chemie.fu-berlin.de
RI Lujan Center, LANL/G-4896-2012; Grabowsky, Simon/H-6014-2012; Hartl,
Monika/F-3094-2014; Hartl, Monika/N-4586-2016;
OI Hartl, Monika/0000-0002-6601-7273; Hartl, Monika/0000-0002-6601-7273;
Morgenroth, Wolfgang/0000-0001-8921-0052
FU Deutsche Forschungsgemeinschaft (DFG) [LE423/13-3, LU222/30-2, SPP1178];
Graduiertenkolleg "Fluor als Schlusselelement-Durch neue
Synthesekonzepte zu Verbindungen mit einzigartigen Eigenschaften"
FX We thank the Deutsche Forschungsgemeinschaft (DFG Grants LE423/13-3 and
LU222/30-2 within SPP1178) and the Graduiertenkolleg "Fluor als
Schlusselelement-Durch neue Synthesekonzepte zu Verbindungen mit
einzigartigen Eigenschaften" for financial support. Miroslav Kohout is
acknowledged for his help with the ELI-D.
NR 85
TC 36
Z9 36
U1 1
U2 19
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 SEP 23
PY 2010
VL 114
IS 37
BP 10185
EP 10196
DI 10.1021/jp100995n
PG 12
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 649FP
UT WOS:000281753800028
PM 20726618
ER
PT J
AU Chen, DL
Stern, AC
Space, B
Johnson, JK
AF Chen, De-Li
Stern, Abraham C.
Space, Brian
Johnson, J. Karl
TI Atomic Charges Derived from Electrostatic Potentials for Molecular and
Periodic Systems
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID METAL-ORGANIC FRAMEWORK; TOTAL-ENERGY CALCULATIONS; AUGMENTED-WAVE
METHOD; FORCE-FIELD; NUCLEIC-ACIDS; BASIS-SET; SIMULATION; ADSORPTION;
ALGORITHM; FORMAMIDE
AB We present a method for fitting atomic charges to the electrostatic potential (ESP) of periodic and nonperiodic systems. This method is similar to the method of Camparla et al. [J. Chem. Theory Comput. 2009, 5, 2866]. We compare the Wolf and Ewald long-range electrostatic summation methods in calculating the ESP for periodic systems. We find that the Wolf summation is computationally more efficient than the Ewald summation by about a factor of 5 with comparable accuracy. Our analysis shows that the choice of grid mesh size influences the fitted atomic charges, especially for systems with buried (highly coordinated) atoms. We find that a maximum grid spacing of 0.2-0.3 angstrom is required to obtain reliable atomic charges. The effect of the exclusion radius for point selection is assessed; we find that the common choice of using the van der Waals (vdW) radius as the exclusion radius for each atom may result in large deviations between the ESP generated from the ab initio calculations and that computed from the fitted charges, especially for points closest to the exclusion radii. We find that a larger value of exclusion radius than commonly used, 1.3 times the vdW radius, provides more reliable results. We find that a penalty function approach for fitting charges for buried atoms, with the target charge taken from Bader charge analysis, gives physically reasonable results.
C1 [Chen, De-Li; Johnson, J. Karl] Natl Energy Technol Lab, Pittsburgh, PA 15236 USA.
[Chen, De-Li; Johnson, J. Karl] Univ Pittsburgh, Dept Chem & Petr Engn, Pittsburgh, PA 15261 USA.
[Stern, Abraham C.; Space, Brian] Univ S Florida, Dept Chem, Tampa, FL 33620 USA.
RP Johnson, JK (reprint author), Natl Energy Technol Lab, Pittsburgh, PA 15236 USA.
EM karlj@pitt.edu
RI Chen, De-Li/H-6867-2012; Johnson, Karl/E-9733-2013
OI Johnson, Karl/0000-0002-3608-8003
FU National Energy Technology Laboratory [DE-AC26-04NT41817]
FX We thank Thomas Manz, Tom Woo, and Carlos Campana for helpful
discussions. This technical effort was performed in support of the
National Energy Technology Laboratory's ongoing research in the area of
computational chemistry under the RDS contract DE-AC26-04NT41817.
NR 47
TC 44
Z9 44
U1 1
U2 34
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 SEP 23
PY 2010
VL 114
IS 37
BP 10225
EP 10233
DI 10.1021/jp103944q
PG 9
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 649FP
UT WOS:000281753800033
PM 20795694
ER
PT J
AU Baker, TA
Head-Gordon, M
AF Baker, Thomas A.
Head-Gordon, Martin
TI Modeling the Charge Transfer between Alkali Metals and Polycyclic
Aromatic Hydrocarbons Using Electronic Structure Methods
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID DENSITY-FUNCTIONAL THEORY; SELF-INTERACTION ERROR;
GENERALIZED-GRADIENT-APPROXIMATION; PLESSET PERTURBATION-THEORY;
CORRELATION-ENERGY; AB-INITIO; MOLECULAR-HYDROGEN; LITHIUM; SPIN;
ADSORPTION
AB The interaction of alkali metals-specifically, lithium-with polycyclic aromatic hydrocarbons (PAHs) was studied using a variety of electronic structure methods. Electron transfer from lithium to a PAH depends on the size and structure of the PAH and the electronic structure method used. In some cases, we observe an artificial transfer when using density functional theory (DFT) due to the self-interaction error, whereas Hartree-Fock underestimates the amount of charge transfer due to overlocalization. Our results have interesting implications for the validity of DFT calculations on the alkali metal-PAH interaction in Li batteries, hydrogen storage devices, and alkali-metal-doped superconductors.
C1 [Baker, Thomas A.; Head-Gordon, Martin] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Head-Gordon, Martin] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA.
RP Head-Gordon, M (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
EM mhg@bastille.cchem.berkeley.edu
FU Office of Science, Office of Basic Energy Sciences, of the 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 thank Dmitry Zubarev and Jinhua Wang
for their useful discussions.
NR 64
TC 35
Z9 35
U1 1
U2 22
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 SEP 23
PY 2010
VL 114
IS 37
BP 10326
EP 10333
DI 10.1021/jp105864v
PG 8
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 649FP
UT WOS:000281753800045
PM 20806955
ER
PT J
AU Zhao, D
Rodriguez, A
Dimitrijevic, NM
Rajh, T
Koodali, RT
AF Zhao, Dan
Rodriguez, Adrian
Dimitrijevic, Nada M.
Rajh, Tijana
Koodali, Ranjit T.
TI Synthesis, Structural Characterization, and Photocatalytic Performance
of Mesoporous W-MCM-48
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID VISIBLE-LIGHT; MOLECULAR-SIEVES; SELECTIVE OXIDATION;
CATALYTIC-ACTIVITY; LOCAL STRUCTURES; UNDESIRABLE MOLECULES;
HYDROGEN-PEROXIDE; CONTAINING MCM-41; REDOX PROPERTIES; SILICATE SIEVE
AB Tungsten-containing mesoporous MCM-48 was synthesized by a rapid and facile room-temperature procedure. The mesoporous structure and the local environment of tungsten species were studied by powder X-ray diffraction, transmission electron microscopy, nitrogen adsorption isotherms, UV-visible diffuse reflectance spectroscopy, and Raman spectrometry. The long-range ordered mesoporous structure of MCM-48 was well preserved after tungsten incorporation. Tungsten oxide species were highly dispersed in the MCM-48 matrix, and no bulk crystalline WO(3) was formed. The as-prepared W-MCM-48 materials show notable photocatalytic activity for hydrogen evolution from a methanol-water mixture under UV irradiation though bulk WO(3) is not active for the reaction. The photocatalytic mechanism was studied by electron spin resonance spectroscopy.
C1 [Zhao, Dan; Rodriguez, Adrian; Koodali, Ranjit T.] Univ S Dakota, Dept Chem, Vermillion, SD 57069 USA.
[Dimitrijevic, Nada M.; Rajh, Tijana] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
[Dimitrijevic, Nada M.; Rajh, Tijana] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
RP Zhao, D (reprint author), Univ S Dakota, Dept Chem, Vermillion, SD 57069 USA.
EM Dan.Zhao@usd.edu; Ranjit.Koodali@usd.edu
RI Koodali, Ranjit/E-5595-2011
OI Koodali, Ranjit/0000-0002-2790-3053
FU NSF [CHE 0722632, CHE 0532242, EPS 0554609]; DOE [DE-FG02-08ER64624];
DOE BES [DE-AC02-06CH11357]
FX This work was supported by NSF-CHE 0722632, NSF-CHE 0532242, NSF-EPS
0554609, SD supported 2010 Center-CRDLM, and DOE-DE-FG02-08ER64624. The
EPR experiments were performed at Argonne National Laboratory under DOE
BES Contract No. DE-AC02-06CH11357. We are thankful to Sarah Chadima for
help with powder XRD experiments.
NR 55
TC 31
Z9 32
U1 0
U2 31
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 SEP 23
PY 2010
VL 114
IS 37
BP 15728
EP 15734
DI 10.1021/jp105190v
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 649FR
UT WOS:000281754000024
ER
PT J
AU Cohen, BE
AF Cohen, Bruce E.
TI BIOLOGICAL IMAGING Beyond fluorescence
SO NATURE
LA English
DT Editorial Material
ID NANOCRYSTALS; PROBE
C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Cohen, BE (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
EM becohen@lbl.gov
NR 10
TC 53
Z9 56
U1 4
U2 49
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 0028-0836
J9 NATURE
JI Nature
PD SEP 23
PY 2010
VL 467
IS 7314
BP 407
EP 408
PG 2
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 653KO
UT WOS:000282090200028
PM 20864989
ER
PT J
AU Long, F
Su, CC
Zimmermann, MT
Boyken, SE
Rajashankar, KR
Jernigan, RL
Yu, EW
AF Long, Feng
Su, Chih-Chia
Zimmermann, Michael T.
Boyken, Scott E.
Rajashankar, Kanagalaghatta R.
Jernigan, Robert L.
Yu, Edward W.
TI Crystal structures of the CusA efflux pump suggest methionine-mediated
metal transport
SO NATURE
LA English
DT Article
ID MEMBRANE-FUSION PROTEIN; MULTIDRUG EFFLUX; ESCHERICHIA-COLI;
PSEUDOMONAS-AERUGINOSA; ACRB; RECOGNITION; SOFTWARE; SYSTEM; CU(I);
CRYSTALLOGRAPHY
AB Gram-negative bacteria, such as Escherichia coli, frequently use tripartite efflux complexes in the resistance-nodulation-cell division (RND) family to expel various toxic compounds from the cell(1,2). The efflux system CusCBA is responsible for extruding biocidal Cu(I) and Ag(I) ions(3,4). No previous structural information was available for the heavy-metal efflux (HME) subfamily of the RND efflux pumps. Here we describe the crystal structures of the inner-membrane transporter CusA in the absence and presence of bound Cu(I) or Ag(I). These CusA structures provide new structural information about the HME subfamily of RND efflux pumps. The structures suggest that the metal-binding sites, formed by a three-methionine cluster, are located within the cleft region of the periplasmic domain. This cleft is closed in the apo-CusA form but open in the CusA-Cu(I) and CusA-Ag(I) structures, which directly suggests a plausible pathway for ion export. Binding of Cu(I) and Ag(I) triggers significant conformational changes in both the periplasmic and transmembrane domains. The crystal structure indicates that CusA has, in addition to the three-methionine metal-binding site, four methionine pairs-three located in the transmembrane region and one in the periplasmic domain. Genetic analysis and transport assays suggest that CusA is capable of actively picking up metal ions from the cytosol, using these methionine pairs or clusters to bind and export metal ions. These structures suggest a stepwise shuttle mechanism for transport between these sites.
C1 [Long, Feng; Yu, Edward W.] Iowa State Univ, Mol Cellular & Dev Biol Interdept Grad Program, Ames, IA 50011 USA.
[Su, Chih-Chia; Yu, Edward W.] Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
[Zimmermann, Michael T.; Boyken, Scott E.; Jernigan, Robert L.; Yu, Edward W.] Iowa State Univ, Bioinformat & Computat Biol Interdept Grad Progra, Ames, IA 50011 USA.
[Rajashankar, Kanagalaghatta R.] Cornell Univ, Dept Chem & Chem Biol, Argonne Natl Lab, Argonne, IL 60439 USA.
[Rajashankar, Kanagalaghatta R.] Cornell Univ, NE CAT, Argonne Natl Lab, Argonne, IL 60439 USA.
[Jernigan, Robert L.; Yu, Edward W.] Iowa State Univ, Dept Biochem Biophys & Mol Biol, Ames, IA 50011 USA.
[Yu, Edward W.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
RP Yu, EW (reprint author), Iowa State Univ, Mol Cellular & Dev Biol Interdept Grad Program, Ames, IA 50011 USA.
EM ewyu@iastate.edu
RI Long, Feng/F-5475-2011; Jernigan, Robert/A-5421-2012;
OI Long, Feng/0000-0001-6313-8558; Zimmermann, Michael/0000-0001-7073-0525
FU National Institutes of Health (NIH), National Center for Research
Resources [RR-15301]; US Department of Energy, Office of Basic Energy
Sciences [DE-AC02-06CH11357]; NIH [GM074027, GM086431, GM081680,
GM072014]
FX We thank M. D. Routh for critical reading of the manuscript. This work
is based on research conducted at the Northeastern Collaborative Access
Team beamlines of the Advanced Photon Source, supported by National
Institutes of Health (NIH) award RR-15301 from the National Center for
Research Resources. Use of the Advanced Photon Source is supported by
the US Department of Energy, Office of Basic Energy Sciences, under
contract no. DE-AC02-06CH11357. This work was supported by NIH grants
GM074027 (to E.W.Y.), GM086431 (to E.W.Y.), GM081680 (to R.L.J.) and
GM072014 (to R.L.J.).
NR 44
TC 104
Z9 106
U1 3
U2 42
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 0028-0836
J9 NATURE
JI Nature
PD SEP 23
PY 2010
VL 467
IS 7314
BP 484
EP U140
DI 10.1038/nature09395
PG 7
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 653KO
UT WOS:000282090200048
PM 20865003
ER
PT J
AU Ofer, O
Keren, A
Gardner, JS
Ren, Y
MacFarlane, WA
AF Ofer, Oren
Keren, Amit
Gardner, Jason S.
Ren, Yang
MacFarlane, W. A.
TI Origin of magnetic freezing in pyrochlore Y2Mo2O7
SO PHYSICAL REVIEW B
LA English
DT Article
ID ANTIFERROMAGNET Y2MO2O7; SPIN; BEHAVIOR; TRANSITION; RESONANCE; SYSTEM
AB We investigated the nature of the spin-glass like phase transition in the geometrically frustrated pyrochlore lattices Y2Mo2O7 using the local probes nuclear and muon magnetic resonances, and the field-dependent long-range probes x-ray and neutron scatterings. The long-range probes indicated that Y2Mo2O7 does not undergo any global symmetry changes, even in a field of 6 T. In contrast, the local signal indicates a lattice distortion close to the critical temperature. The nuclei show at least two inequivalent Y sites, and the muons show sublinear line broadening as a function of moment size, over a wide temperature range. The conclusion from all the measurements is that even in high field, the distortion of Y2Mo2O7 takes place within the unit cell while its global cubic symmetry is preserved. Moreover, the muon result clearly indicates the presence of magnetoelastic coupling.
C1 [Ofer, Oren] TRIUMF, Vancouver, BC V6T 2A3, Canada.
[Ofer, Oren; Keren, Amit] Technion, Dept Phys, IL-32000 Haifa, Israel.
[Gardner, Jason S.] Natl Inst Stand & Technol, NCNR, Gaithersburg, MD 20899 USA.
[Gardner, Jason S.] Indiana Univ, Bloomington, IN 47408 USA.
[Ren, Yang] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[MacFarlane, W. A.] Univ British Columbia, Dept Chem, Vancouver, BC V6T 1Z1, Canada.
RP Ofer, O (reprint author), TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada.
EM oren@triumf.ca
RI Gardner, Jason/A-1532-2013
FU NATO [PST.CLG.978705]; Israel-U.S. Binational Science Foundation; HFM
network of the ESF; European Commission [RII3-CT-2004-506008]; U.S. DOE
[DE-AC02-06CH11357]
FX We are grateful to the staff of TRIUMF for assistance with the
mu+SR experiments. O.O. and A.K. acknowledge the financial
support of NATO-Collaborative Linkage Grant, Reference No.
PST.CLG.978705, the Israel-U.S. Binational Science Foundation and the
HFM network of the ESF, and the European Commission under the Sixth
Framework Programme through the Key Action: Strengthening the European
Research Area, Research Infrastructures, Contract No.
RII3-CT-2004-506008. Use of APS was supported by the U.S. DOE under
Contract No. DE-AC02-06CH11357.
NR 28
TC 12
Z9 12
U1 1
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 SEP 23
PY 2010
VL 82
IS 9
AR 092403
DI 10.1103/PhysRevB.82.092403
PG 4
WC Physics, Condensed Matter
SC Physics
GA 653NC
UT WOS:000282097200001
ER
PT J
AU Xiao, Y
Su, Y
Li, HF
Kumar, CMN
Mittal, R
Persson, J
Senyshyn, A
Gross, K
Brueckel, T
AF Xiao, Y.
Su, Y.
Li, H. -F.
Kumar, C. M. N.
Mittal, R.
Persson, J.
Senyshyn, A.
Gross, K.
Brueckel, Th.
TI Neutron diffraction investigation of the crystal and magnetic structures
in KCrF3 perovskite
SO PHYSICAL REVIEW B
LA English
DT Article
ID WEAK FERROMAGNETISM; LAMNO3; SUPEREXCHANGE; TRANSITIONS; DISTORTION;
INSULATOR; PHYSICS
AB KCrF3 represents another prototypical orbital-ordered perovskite, where Cr2+ possesses the same electronic configuration of 3d(4) as that of strongly Jahn-Teller distorted Mn3+ in many colossal magnetoresistance manganites. The crystal and magnetic structures of KCrF3 compound are investigated by using polarized and unpolarized neutron powder-diffraction methods. The results show that the KCrF3 compound crystallizes in tetragonal structure at room temperature and undergoes a monoclinic distortion with the decrease in temperature. The distortion of the crystal structure indicates the presence of cooperative Jahn-Teller distortion which is driven by orbital ordering. With decreasing temperature, four magnetic phase transitions are observed at 79.5, 45.8, 9.5, and 3.2 K, which suggests a rich magnetic phase diagram. Below T-N = 79.5 K, the Cr2+ moment orders in an incommensurate antiferromagnetic arrangement, which can be defined by the magnetic propagation vector (1/2 + delta, 1/2 + delta, 0). The incommensurate-commensurate magnetic transition occurs at 45.8 K and the magnetic propagation vector locks into (1/2, 1/2, 0) with the Cr moment of 3.34(5) mu(B), aligned ferromagnetically in (220) plane, but antiferromagnetically along [110] direction. Below 9.5 K, the canted antiferromagnetic ordering and weak ferromagnetism arise from the collinear antiferromagnetic structure while the Dzyaloshinskii-Moriya interaction and tilted character of the single-ion anisotropy might give rise to the complex magnetic behaviors below 9.5 K.
C1 [Xiao, Y.; Li, H. -F.; Kumar, C. M. N.; Persson, J.; Gross, K.; Brueckel, Th.] Forschungszentrum Julich, Inst Festkoerperforsch, D-52425 Julich, Germany.
[Su, Y.; Mittal, R.; Brueckel, Th.] Forschungszentrum Julich, Outstn FRM 2, IFF, Juelich Ctr Neutron Sci, D-85747 Garching, Germany.
[Li, H. -F.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Li, H. -F.] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
[Mittal, R.] Bhabha Atom Res Ctr, Div Solid State Phys, Mumbai 400085, Maharashtra, India.
[Senyshyn, A.] Forsch Neutronenquelle Heinz Maier Leibnitz FRM I, D-85747 Garching, Germany.
[Senyshyn, A.] Tech Univ Darmstadt, Inst Mat Sci, D-64287 Darmstadt, Germany.
RP Xiao, Y (reprint author), Forschungszentrum Julich, Inst Festkoerperforsch, D-52425 Julich, Germany.
EM y.xiao@fz-juelich.de
RI Li, Haifeng/F-9743-2013; Bruckel, Thomas/J-2968-2013; Su,
Yixi/K-9119-2013; Senyshyn, Anatoliy/C-8267-2014; Xiao,
Yinguo/N-9069-2015
OI Bruckel, Thomas/0000-0003-1378-0416; Su, Yixi/0000-0001-8434-1758;
Senyshyn, Anatoliy/0000-0002-1473-8992;
NR 32
TC 10
Z9 11
U1 2
U2 10
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 SEP 23
PY 2010
VL 82
IS 9
AR 094437
DI 10.1103/PhysRevB.82.094437
PG 5
WC Physics, Condensed Matter
SC Physics
GA 653NC
UT WOS:000282097200002
ER
PT J
AU Aaltonen, T
Gonzalez, BA
Amerio, S
Amidei, D
Anastassov, A
Annovi, A
Antos, J
Apollinari, G
Appel, JA
Apresyan, A
Arisawa, T
Artikov, A
Asaadi, J
Ashmanskas, W
Auerbach, B
Aurisano, A
Azfar, F
Badgett, W
Barbaro-Galtieri, A
Barnes, VE
Barnett, BA
Barria, P
Bartos, P
Bauce, M
Bauer, G
Bedeschi, F
Beecher, D
Behari, S
Bellettini, G
Bellinger, J
Benjamin, D
Beretvas, A
Bhatti, A
Binkley, M
Bisello, D
Bizjak, I
Bland, KR
Blocker, C
Blumenfeld, B
Bocci, A
Bodek, A
Bortoletto, D
Boudreau, J
Boveia, A
Brau, B
Brigliadori, L
Brisuda, A
Bromberg, C
Brucken, E
Bucciantonio, M
Budagov, J
Budd, HS
Budd, S
Burkett, K
Busetto, G
Bussey, P
Buzatu, A
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
Chen, YC
Chertok, M
Chiarelli, G
Chlachidze, G
Chlebana, F
Cho, K
Chokheli, D
Chou, JP
Chung, WH
Chung, YS
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
Dagenhart, D
d'Ascenzo, N
Datta, M
De Barbaro, P
De Cecco, S
De Lorenzo, G
Dell'Orso, M
Deluca, C
Demortier, L
Deng, J
Deninno, M
Devoto, F
d'Errico, M
Canto, A
Di Ruzza, B
Dittmann, JR
D'Onofrio, M
Donati, S
Dong, P
Dorigo, T
Ebina, K
Elagin, A
Eppig, A
Erbacher, R
Errede, D
Errede, S
Ershaidat, N
Eusebi, R
Fang, HC
Farrington, S
Feindt, M
Fernandez, JP
Ferrazza, C
Field, R
Flanagan, G
Forrest, R
Frank, MJ
Franklin, M
Freeman, JC
Furic, I
Gallinaro, M
Galyardt, J
Garcia, JE
Garfinkel, AF
Garosi, P
Gerberich, H
Gerchtein, E
Giagu, S
Giakoumopoulou, V
Giannetti, P
Gibson, K
Ginsburg, CM
Giokaris, N
Giromini, P
Giunta, M
Giurgiu, G
Glagolev, V
Glenzinski, D
Gold, M
Goldin, D
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
da Costa, JG
Gunay-Unalan, Z
Haber, C
Hahn, SR
Halkiadakis, E
Hamaguchi, A
Han, JY
Happacher, F
Hara, K
Hare, D
Hare, M
Harr, RF
Hatakeyama, K
Hays, C
Heck, M
Heinrich, J
Herndon, M
Hewamanage, S
Hidas, D
Hocker, A
Hopkins, W
Horn, D
Hou, S
Hughes, RE
Hurwitz, M
Husemann, U
Hussain, N
Hussein, M
Huston, 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
Junk, TR
Kamon, T
Karchin, PE
Kato, Y
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
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
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
Leo, S
Leone, S
Lewis, JD
Lin, CJ
Linacre, J
Lindgren, M
Lipeles, E
Lister, A
Litvintsev, DO
Liu, C
Liu, Q
Liu, T
Lockwitz, S
Lockyer, NS
Loginov, A
Lucchesi, D
Lueck, J
Lujan, P
Lukens, P
Lungu, G
Lys, J
Lysak, R
Madrak, R
Maeshima, K
Makhoul, K
Maksimovic, P
Malik, S
Manca, G
Manousakis-Katsikakis, A
Margaroli, F
Marino, C
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
Mitra, A
Mitselmakher, G
Miyake, H
Moed, S
Moggi, N
Mondragon, MN
Moon, CS
Moore, R
Morello, MJ
Morlock, J
Fernandez, PM
Mukherjee, A
Muller, T
Murat, P
Mussini, M
Nachtman, J
Nagai, Y
Naganoma, J
Nakano, I
Napier, A
Nett, J
Neu, C
Neubauer, MS
Nielsen, J
Nodulman, L
Norniella, O
Nurse, E
Oakes, L
Oh, SH
Oh, YD
Oksuzian, I
Okusawa, T
Orava, R
Ortolan, L
Griso, SP
Pagliarone, C
Palencia, E
Papadimitriou, V
Paramonov, AA
Patrick, J
Pauletta, G
Paulini, M
Paus, C
Pellett, DE
Penzo, A
Phillips, TJ
Piacentino, G
Pianori, E
Pilot, J
Pitts, K
Plager, C
Pondrom, L
Potamianos, K
Poukhov, O
Prokoshin, F
Pronko, A
Ptohos, F
Pueschel, E
Punzi, G
Pursley, J
Rahaman, A
Ramakrishnan, V
Ranjan, N
Redondo, I
Renton, P
Rescigno, M
Rimondi, F
Ristori, L
Robson, A
Rodrigo, T
Rodriguez, T
Rogers, E
Rolli, S
Roser, R
Rossi, M
Ruffini, F
Ruiz, A
Russ, J
Rusu, V
Safonov, A
Sakumoto, WK
Santi, L
Sartori, L
Sato, K
Saveliev, V
Savoy-Navarro, A
Schlabach, P
Schmidt, A
Schmidt, EE
Schmidt, MP
Schmitt, M
Schwarz, T
Scodellaro, L
Scribano, A
Scuri, F
Sedov, A
Seidel, S
Seiya, Y
Semenov, A
Sforza, F
Sfyrla, A
Shalhout, SZ
Shears, T
Shepard, PF
Shimojima, M
Shiraishi, S
Shochet, M
Shreyber, I
Simonenko, A
Sinervo, P
Sissakian, A
Sliwa, K
Smith, JR
Snider, FD
Soha, A
Somalwar, S
Sorin, V
Squillacioti, P
Stanitzki, M
Denis, RS
Stelzer, B
Stelzer-Chilton, O
Stentz, D
Strologas, J
Strycker, GL
Sudo, Y
Sukhanov, A
Suslov, I
Takemasa, K
Takeuchi, Y
Tang, J
Tecchio, M
Teng, PK
Thom, J
Thome, J
Thompson, GA
Thomson, E
Ttito-Guzman, P
Tkaczyk, S
Toback, D
Tokar, S
Tollefson, K
Tomura, T
Tonelli, D
Torre, S
Torretta, D
Totaro, P
Trovato, M
Tu, Y
Turini, N
Ukegawa, F
Uozumi, S
Varganov, A
Vataga, E
Vazquez, F
Velev, G
Vellidis, C
Vidal, M
Vila, I
Vilar, R
Vogel, M
Volpi, G
Wagner, P
Wagner, RL
Wakisaka, T
Wallny, R
Wang, SM
Warburton, A
Waters, D
Weinberger, M
Wester, WC
Whitehouse, B
Whiteson, D
Wicklund, AB
Wicklund, E
Wilbur, S
Wick, F
Williams, HH
Wilson, JS
Wilson, P
Winer, BL
Wittich, P
Wolbers, S
Wolfe, H
Wright, T
Wu, X
Wu, Z
Yamamoto, K
Yamaoka, J
Yang, UK
Yang, YC
Yao, WM
Yeh, GP
Yi, K
Yoh, J
Yorita, K
Yoshida, T
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CA CDF Collaboration
TI Measurement of the top pair production cross section in the dilepton
decay channel in p(p)over-bar collisions at root s = 1.96 TeV
SO PHYSICAL REVIEW D
LA English
DT Article
ID ELECTROMAGNETIC CALORIMETER; CDF; DETECTOR; PERFORMANCE; COLLIDER;
FERMILAB; QCD
AB A measurement of the t (t) over bar production cross section in p (p) over bar collisions at root s = 1.96 TeV using events with two leptons, missing transverse energy, and jets is reported. The data were collected with the CDF II detector. The result in a data sample corresponding to an integrated luminosity 2.8 fb(-1) is sigma(t (t) over bar) = 6.27 +/- 0.73(stat) +/- 0.63(syst) +/- 0.39(lum) pb. for an assumed top mass of 175 GeV/c(2).
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[Amerio, S.; Bauce, M.; Bisello, D.; Busetto, 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.
[Bauce, M.; Bisello, D.; Busetto, G.; d'Errico, M.; 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, IN2P3, LPNHE,UMR7585, 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.; Bucciantonio, M.; Carosi, R.; Cavaliere, V.; Chiarelli, G.; Ciocci, M. A.; Compostella, G.; 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.; Leo, S.; Leone, S.; Menzione, A.; Piacentino, G.; Punzi, G.; Ristori, L.; Ruffini, F.; Sartori, L.; Scribano, A.; Scuri, F.; Sforza, F.; Trovato, M.; Turini, N.; Vataga, E.; Volpi, G.] Ist Nazl Fis Nucl Pisa, I-56127 Pisa, Italy.
[Bellettini, G.; Bucciantonio, M.; Compostella, G.; Crescioli, F.; Dell'Orso, M.; Di Canto, A.; Donati, S.; Leo, S.; Punzi, G.; Sforza, F.; Volpi, G.] Univ Pisa, I-56127 Pisa, Italy.
[Barria, P.; Cavaliere, V.; Ciocci, M. A.; Garosi, P.; Latino, G.; Ruffini, F.; Scribano, A.; 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.; 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.; Liu, Q.; Margaroli, F.; Potamianos, K.; Ranjan, N.; Sedov, A.] Purdue Univ, W Lafayette, IN 47907 USA.
[Bodek, A.; Budd, H. S.; Chung, Y. S.; De Barbaro, P.; 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.; Malik, S.; Mesropian, C.] Rockefeller Univ, New York, NY 10065 USA.
[De Cecco, S.; Giagu, S.; Iori, M.; Mastrandrea, P.; Rescigno, M.] Ist Nazl Fis Nucl, Sez Roma 1, Rome, Italy.
[Giagu, S.; Iori, M.] Sapienza Univ Roma, I-00185 Rome, Italy.
[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.; Goldin, D.; Kamon, T.; Khotilovich, V.; Krutelyov, 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.; Pagliarone, C.; Pauletta, G.; Penzo, A.; Rossi, M.; Santi, L.; Totaro, P.; Zanetti, A.] Ist Nazl Fis Nucl Trieste Udine, I-34100 Trieste, Italy.
RP Aaltonen, T (reprint author), Acad Sinica, Inst Phys, Taipei 11529, Taiwan.
RI Piacentino, Giovanni/K-3269-2015; Martinez Ballarin,
Roberto/K-9209-2015; Gorelov, Igor/J-9010-2015; Prokoshin,
Fedor/E-2795-2012; Canelli, Florencia/O-9693-2016; 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; Lazzizzera, Ignazio/E-9678-2015; 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; Introzzi,
Gianluca/K-2497-2015; Ruiz, Alberto/E-4473-2011; Robson,
Aidan/G-1087-2011; De Cecco, Sandro/B-1016-2012; 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; Lysak, Roman/H-2995-2014; Moon,
Chang-Seong/J-3619-2014
OI Piacentino, Giovanni/0000-0001-9884-2924; 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; 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; Lazzizzera, Ignazio/0000-0001-5092-7531;
ciocci, maria agnese /0000-0003-0002-5462; Chiarelli,
Giorgio/0000-0001-9851-4816; Introzzi, Gianluca/0000-0002-1314-2580;
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; Moon,
Chang-Seong/0000-0001-8229-7829
FU U.S. Department of 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; 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, 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 of Energy and 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 30
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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 SEP 23
PY 2010
VL 82
IS 5
AR 052002
DI 10.1103/PhysRevD.82.052002
PG 20
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 653XG
UT WOS:000282130600001
ER
PT J
AU Martin, SP
AF Martin, Stephen P.
TI Raising the Higgs mass with Yukawa couplings for isotriplets in
vectorlike extensions of minimal supersymmetry
SO PHYSICAL REVIEW D
LA English
DT Article
ID PRECISION ELECTROWEAK EXPERIMENTS; RENORMALIZATION-GROUP EQUATIONS;
SOFTLY BROKEN SUPERSYMMETRY; DISCRETE GAUGE ANOMALIES; STANDARD MODEL;
RADIATIVE-CORRECTIONS; TECHNICOLOR THEORIES; CHARGED LEPTONS;
HEAVY-LEPTONS; BETA-FUNCTION
AB Extra vectorlike matter with both electroweak-singlet masses and large Yukawa couplings can significantly raise the lightest Higgs boson mass in supersymmetry through radiative corrections. I consider models of this type that involve a large Yukawa coupling between weak isotriplet and isodoublet chiral supermultiplets. The particle content can be completed to provide perturbative gauge coupling unification, in several different ways. The impact on precision electroweak observables is shown to be acceptably small, even if the new particles are as light as the current experimental bounds of order 100 GeV. I study the corrections to the lightest Higgs boson mass, and discuss the general features of the collider signatures for the new fermions in these models.
C1 [Martin, Stephen P.] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA.
[Martin, Stephen P.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
RP Martin, SP (reprint author), No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA.
FU National Science Foundation [PHY-0757325]
FX This work was supported in part by the National Science Foundation Grant
No. PHY-0757325.
NR 109
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U2 1
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 SEP 23
PY 2010
VL 82
IS 5
AR 055019
DI 10.1103/PhysRevD.82.055019
PG 19
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 653XG
UT WOS:000282130600004
ER
PT J
AU Orsi, D
Cristofolini, L
Fontana, MP
Pontecorvo, E
Caronna, C
Fluerasu, A
Zontone, F
Madsen, A
AF Orsi, Davide
Cristofolini, Luigi
Fontana, Marco P.
Pontecorvo, Emanuele
Caronna, Chiara
Fluerasu, Andrei
Zontone, Federico
Madsen, Anders
TI Slow dynamics in an azopolymer molecular layer studied by x-ray photon
correlation spectroscopy
SO PHYSICAL REVIEW E
LA English
DT Article
ID LIQUID-CRYSTALLINE POLYMERS; SIDE-CHAIN POLYMERS; LIGHT; RELAXATION;
TRANSITION; FILMS; GELS
AB We report the results of x-ray photon correlation spectroscopy (XPCS) experiments on multilayers of a photosensitive azo-polymer which can be softened by photoisomerization. Time correlation functions have been measured at different temperatures and momentum transfers (q) and under different illumination conditions (dark, UV or visible). The correlation functions are well described by the Kohlrausch-Williams-Watts (KWW) form with relaxation times that are proportional to q(-1). The characteristic relaxation times follow the same Vogel-Fulcher-Tammann law describing the bulk viscosity of this polymer. The out-of-equilibrium relaxation dynamics following a UV photoperturbation are accelerated, which is in agreement with a fluidification effect previously measured by rheology. The transient dynamics are characterized by two times correlation function, and dynamical heterogeneity is evidenced by calculating the variance chi of the degree of correlation as a function of ageing time. A clear peak in chi appears at a well defined time tau(C) which scales with q(-1) and with the ageing time, in a similar fashion as previously reported in colloidal suspensions [O. Dauchot et al., Phys. Rev. Lett. 95, 265701 (2005)]. From an accurate analysis of the correlation functions we could demonstrate a temperature and light dependent cross-over from compressed KWW to simple exponential behavior.
C1 [Orsi, Davide; Cristofolini, Luigi; Fontana, Marco P.] Univ Parma, Dept Phys, I-43100 Parma, Italy.
[Pontecorvo, Emanuele] Univ Roma La Sapienza, Dept Phys, I-00185 Rome, Italy.
[Caronna, Chiara] SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA.
[Fluerasu, Andrei] Brookhaven Natl Lab, Upton, NY 11973 USA.
[Zontone, Federico; Madsen, Anders] European Synchrotron Radiat Facil, F-38043 Grenoble, France.
RP Orsi, D (reprint author), Univ Parma, Dept Phys, Viale Usberti 7-A, I-43100 Parma, Italy.
RI Cristofolini, Luigi/B-7250-2014; Orsi, Davide/P-5748-2016
OI Cristofolini, Luigi/0000-0003-2440-4934; Orsi,
Davide/0000-0003-3223-8622
FU ESRF; BNL
FX We wish to acknowledge the ESRF for beamtime and funding. AF wishes to
acknowledge the BNL NSLS-II project for funding.
NR 42
TC 17
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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 SEP 23
PY 2010
VL 82
IS 3
AR 031804
DI 10.1103/PhysRevE.82.031804
PN 1
PG 7
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 653YD
UT WOS:000282133400007
PM 21230098
ER
PT J
AU Hong, T
Kim, YH
Hotta, C
Takano, Y
Tremelling, G
Turnbull, MM
Landee, CP
Kang, HJ
Christensen, NB
Lefmann, K
Schmidt, KP
Uhrig, GS
Broholm, C
AF Hong, Tao
Kim, Y. H.
Hotta, C.
Takano, Y.
Tremelling, G.
Turnbull, M. M.
Landee, C. P.
Kang, H. -J.
Christensen, N. B.
Lefmann, K.
Schmidt, K. P.
Uhrig, G. S.
Broholm, C.
TI Field-Induced Tomonaga-Luttinger Liquid Phase of a Two-Leg Spin-1/2
Ladder with Strong Leg Interactions
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID MAGNETIC-FIELD; HEISENBERG LADDER; CHAINS
AB We study the magnetic-field-induced quantum phase transition from a gapped quantum phase that has no magnetic long-range order into a gapless phase in the spin-1/2 ladder compound bis(2,3-dimethylpyridinium) tetrabromocuprate (DIMPY). At temperatures below about 1 K, the specific heat in the gapless phase attains an asymptotic linear temperature dependence, characteristic of a Tomonaga-Luttinger liquid. Inelastic neutron scattering and the specific heat measurements in both phases are in good agreement with theoretical calculations, demonstrating that DIMPY is the first model material for an S = 1/2 two-leg spin ladder in the strong-leg regime.
C1 [Hong, Tao] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA.
[Kim, Y. H.; Takano, Y.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA.
[Hotta, C.] Kyoto Sangyo Univ, Fac Sci, Dept Phys, Kyoto 6038555, Japan.
[Tremelling, G.; Turnbull, M. M.; Landee, C. P.] Clark Univ, Carlson Sch Chem, Worcester, MA 01610 USA.
[Tremelling, G.; Turnbull, M. M.; Landee, C. P.] Clark Univ, Dept Phys, Worcester, MA 01610 USA.
[Kang, H. -J.] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA.
[Christensen, N. B.] ETH Zurich Paul Scherrer Inst, Neutron Scattering Lab, CH-5232 Villigen, Switzerland.
[Lefmann, K.] Univ Copenhagen, Nanosci Ctr, Niels Bohr Inst, DK-2100 Copenhagen, Denmark.
[Schmidt, K. P.; Uhrig, G. S.] TU Dortmund, Lehrstuhl Theoret Phys 1, D-44221 Dortmund, Germany.
[Broholm, C.] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
RP Hong, T (reprint author), Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA.
EM hongt@ornl.gov
RI Schmidt, Kai /C-7286-2009; Hong, Tao/F-8166-2010; Broholm,
Collin/E-8228-2011; Uhrig, Gotz/F-4940-2011; Lefmann, Kim/M-9228-2014;
Christensen, Niels/A-3947-2012;
OI Turnbull, Mark/0000-0002-0232-8224; Hong, Tao/0000-0002-0161-8588;
Broholm, Collin/0000-0002-1569-9892; Lefmann, Kim/0000-0003-4282-756X;
Christensen, Niels/0000-0001-6443-2142; Schmidt, Kai
Phillip/0000-0002-8278-8238
FU Division of Scientific User Facilities, Office of BES, DOE; NSF
[DMR-0306940, DMR-0706553, DMR-0454672, DMR-0654118]; Ministry of
Education, Science, Sports, and Culture of Japan [19740218, 21110522,
22014014]; ESF; EuroHorcs through EURYI; Danish Natural Science Research
Council under DANSCATT; Swiss NSF [PP002-102831]; Carlsberg Foundation;
State of Florida; DOE
FX We thank R. Paul for help with neutron activation analysis, and J.-H.
Park and T.P. Murphy for help with cryogenics. The work at ORNL was
partially funded by the Division of Scientific User Facilities, Office
of BES, DOE. The work at JHU was supported by the NSF through Grants No.
DMR-0306940 and No. DMR-0706553. C.H. was supported by Kakenhi Grants
No. 19740218, No. 21110522, and No. 22014014 from the Ministry of
Education, Science, Sports, and Culture of Japan. K.P.S. acknowledges
ESF and EuroHorcs for funding through EURYI. The work at RITA II, PSI
was supported by the Danish Natural Science Research Council under
DANSCATT and by the Swiss NSF Contract No. PP002-102831. The work at
NIST utilized facilities supported in part by the NSF under Agreement
No. DMR-0454672. The cryomagnet at PSI was partially funded by the
Carlsberg Foundation. The NHMFL is supported by NSF Cooperative
Agreement No. DMR-0654118, and by the State of Florida and the DOE.
NR 28
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U2 36
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 SEP 23
PY 2010
VL 105
IS 13
AR 137207
DI 10.1103/PhysRevLett.105.137207
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653YZ
UT WOS:000282136600018
PM 21230808
ER
PT J
AU Wuosmaa, AH
Back, BB
Baker, S
Brown, BA
Deibel, CM
Fallon, P
Hoffman, CR
Kay, BP
Lee, HY
Lighthall, JC
Macchiavelli, AO
Marley, ST
Pardo, RC
Rehm, KE
Schiffer, JP
Shetty, DV
Wiedeking, M
AF Wuosmaa, A. H.
Back, B. B.
Baker, S.
Brown, B. A.
Deibel, C. M.
Fallon, P.
Hoffman, C. R.
Kay, B. P.
Lee, H. Y.
Lighthall, J. C.
Macchiavelli, A. O.
Marley, S. T.
Pardo, R. C.
Rehm, K. E.
Schiffer, J. P.
Shetty, D. V.
Wiedeking, M.
TI C-15(d, p)C-16 Reaction and Exotic Behavior in C-16
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID NUCLEAR SHELL-MODEL; PARITY; STATES
AB We have studied the C-15(d, p)C-16 reaction in inverse kinematics using the Helical Orbit Spectrometer at Argonne National Laboratory. Prior studies of electromagnetic-transition rates in C-16 suggested an exotic decoupling of the valence neutrons from the core in that nucleus. Neutron-adding spectroscopic factors give a different probe of the wave functions of the relevant states in C-16. Shell-model calculations reproduce both the present transfer data and the previously measured transition rates, suggesting that C-16 may be described without invoking very exotic phenomena.
C1 [Wuosmaa, A. H.; Lighthall, J. C.; Marley, S. T.; Shetty, D. V.] Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA.
[Back, B. B.; Baker, S.; Deibel, C. M.; Hoffman, C. R.; Kay, B. P.; Lighthall, J. C.; Marley, S. T.; Pardo, R. C.; Rehm, K. E.; Schiffer, J. P.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
[Brown, B. A.] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA.
[Deibel, C. M.] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA.
[Fallon, P.; Macchiavelli, A. O.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Lee, H. Y.] Los Alamos Natl Lab, LANSCE NS, Los Alamos, NM 87545 USA.
[Wiedeking, M.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
RP Wuosmaa, AH (reprint author), Western Michigan Univ, Dept Phys, Kalamazoo, MI 49008 USA.
RI Kay, Benjamin/F-3291-2011
OI Kay, Benjamin/0000-0002-7438-0208
FU U.S. Department of Energy, Office of Nuclear Physics [DE-FG02-04ER41320,
DE-AC02-06CH11357, DE-AC02-05CH11231, DE-AC52-06NA25396,
DE-AC52-07NA27344]; National Science Foundation [PHY-02-16783,
PHY-07-58099]
FX This work was supported by the U.S. Department of Energy, Office of
Nuclear Physics, under Contracts No. DE-FG02-04ER41320, No.
DE-AC02-06CH11357, No. DE-AC02-05CH11231, No. DE-AC52-06NA25396, and No.
DE-AC52-07NA27344, and National Science Foundation Grants No.
PHY-02-16783 and No. PHY-07-58099.
NR 30
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PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
EI 1079-7114
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD SEP 23
PY 2010
VL 105
IS 13
AR 132501
DI 10.1103/PhysRevLett.105.132501
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653YZ
UT WOS:000282136600005
PM 21230766
ER
PT J
AU Parnell, JJ
Rompato, G
Latta, LC
Pfrender, ME
Van Nostrand, JD
He, ZL
Zhou, JZ
Andersen, G
Champine, P
Ganesan, B
Weimer, BC
AF Parnell, J. Jacob
Rompato, Giovanni
Latta, Leigh C.
Pfrender, Michael E.
Van Nostrand, Joy D.
He, Zhili
Zhou, Jizhong
Andersen, Gary
Champine, Patti
Ganesan, Balasubramanian
Weimer, Bart C.
TI Functional Biogeography as Evidence of Gene Transfer in Hypersaline
Microbial Communities
SO PLOS ONE
LA English
DT Article
ID GREAT-SALT-LAKE; BACTERIAL COMMUNITIES; CODON USAGE; DIVERSITY;
EVOLUTION; SEQUENCES; GENOME; DNA; RECOMBINATION; POPULATIONS
AB Background: Horizontal gene transfer (HGT) plays a major role in speciation and evolution of bacteria and archaea by controlling gene distribution within an environment. However, information that links HGT to a natural community using relevant population-genetics parameters and spatial considerations is scarce. The Great Salt Lake (Utah, USA) provides an excellent model for studying HGT in the context of biogeography because it is a contiguous system with dispersal limitations due to a strong selective salinity gradient. We hypothesize that in spite of the barrier to phylogenetic dispersal, functional characteristics-in the form of HGT-expand beyond phylogenetic limitations due to selective pressure.
Methodology and Results: To assay the functional genes and microorganisms throughout the GSL, we used a 16S rRNA oligonucleotide microarray (Phylochip) and a functional gene array (GeoChip) to measure biogeographic patterns of nine microbial communities. We found a significant difference in biogeography based on microarray analyses when comparing Sorensen similarity values for presence/absence of function and phylogeny (Student's t-test; p = 0.005).
Conclusion and Significance: Biogeographic patterns exhibit behavior associated with horizontal gene transfer in that informational genes (16S rRNA) have a lower similarity than functional genes, and functional similarity is positively correlated with lake-wide selective pressure. Specifically, high concentrations of chromium throughout GSL correspond to an average similarity of chromium resistance genes that is 22% higher than taxonomic similarity. This suggests active HGT may be measured at the population level in microbial communities and these biogeographic patterns may serve as a model to study bacteria adaptation and speciation.
C1 [Parnell, J. Jacob; Rompato, Giovanni; Champine, Patti; Ganesan, Balasubramanian; Weimer, Bart C.] Utah State Univ, Ctr Integrated BioSyst, Logan, UT 84322 USA.
[Latta, Leigh C.; Pfrender, Michael E.; Weimer, Bart C.] Utah State Univ, Dept Biol, Logan, UT 84322 USA.
[Ganesan, Balasubramanian] Utah State Univ, Dept Nutr & Food Sci, Logan, UT 84322 USA.
[Pfrender, Michael E.] Utah State Univ, Ctr Ecol, Logan, UT 84322 USA.
[Van Nostrand, Joy D.; He, Zhili; Zhou, Jizhong] Univ Oklahoma, Dept Bot & Microbiol, Inst Environm Genom, Norman, OK 73019 USA.
[Andersen, Gary] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
RP Parnell, JJ (reprint author), Utah State Univ, Ctr Integrated BioSyst, Logan, UT 84322 USA.
EM jacob.parnell@usu.edu
RI He, Zhili/C-2879-2012; Van Nostrand, Joy/F-1740-2016; Andersen,
Gary/G-2792-2015
OI Van Nostrand, Joy/0000-0001-9548-6450; Andersen,
Gary/0000-0002-1618-9827
FU National Science Foundation [DEB-021212487]; United States Department of
Agriculture CSREES [2006-34526-17001]; Utah Agricultural Experiment
Station at Utah State University
FX Funding for this project was provided by National Science Foundation
grant DEB-021212487 to MEP, and a grant from the United States
Department of Agriculture CSREES 2006-34526-17001. This project was
supported by the Utah Agricultural Experiment Station at Utah State
University as journal paper number 8091. The funders had no role in
study design, data collection and analysis, decision to publish, or
preparation of the manuscript.
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PI SAN FRANCISCO
PA 185 BERRY ST, STE 1300, SAN FRANCISCO, CA 94107 USA
SN 1932-6203
J9 PLOS ONE
JI PLoS One
PD SEP 23
PY 2010
VL 5
IS 9
AR e12919
DI 10.1371/journal.pone.0012919
PG 8
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 653KV
UT WOS:000282091100023
PM 20957119
ER
PT J
AU Opresko, DM
Breedy, O
AF Opresko, D. M.
Breedy, Odalisca
TI A new species of antipatharian coral (Cnidaria: Anthozoa: Antipatharia:
Schizopathidae) from the Pacific coast of Costa Rica
SO PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON
LA English
DT Article
AB A new species of antipatharian coral (Anthozoa: Antipatharia) is described from the Pacific coast of Costa Rica. Lillipathes ritamariae, new species, forms large, multi-branched, flabellate colonies that reach a height of 60 cm or more. The genus Lillipathes is characterized by pinnules in four rows and arranged in bilateral alternating pairs. In L. ritamariae, the pinnules occur in only two rows in portions of the corallum; however, the characteristic Lillipathes pinnulation pattern is common enough to support assigning this species to this genus. The species can be distinguished from its cogeners by its very short pinnules (mostly 1-1.5 cm in length) and the development of many of the lateral pinnules into pinnulated branches. In contrast, in L. wingi, the pinnules are up to 5 cm long and only a few in the colony develop into branches. In L. quadribrachiata, the pinnules are up to about 3 cm long, and in Lillipathes lilliei, the pinnules are more than 10 cm in length, and only a small number develop into branches.
C1 [Opresko, D. M.] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA.
[Breedy, Odalisca] Smithsonian Trop Res Inst, Balboa, Panama.
[Breedy, Odalisca] Univ Costa Rica, Ctr Invest Ciencias Mar & Limnol, San Jose, Costa Rica.
[Breedy, Odalisca] Univ Costa Rica, Ctr Invest Estruct Microscopicas, San Jose, Costa Rica.
RP Opresko, DM (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA.
EM opreskodm@ornl.gov; odalisca.breedy@ucr.ac.cr
FU NSF [OCE-0939557]; Smithsonian Institution; Oak Ridge National
Laboratory, Oak Ridge, Tennessee
FX The first author is especially grateful to Jorge Cortes for his
invitation to visit San Jose to study the antipatharian corals in the
university collection and for his kind hospitality during that visit.
The authors also wish to thank Rita M. Vargas (Museo de Zoologia,
University of Costa Rica) for her assistance with the coral collection.
Special thanks to Lisa Levin (Chief Scientist), Greg Rouse and Harim Cha
(Scripps Institution of Oceanography, University of California at San
Diego) for collecting the material and for providing associated
information on the specimens and photographs of the colonies in situ and
after collection. The specimens were collected as part of research
activities conducted under NSF grant OCE-0939557 to Lisa Levin and Greg
Rouse. Photomicrographs were prepared in the Scanning Electron
Microscopy Laboratories at the CIEMIC, Microscopic Structures Research
Centre, University of Costa Rica, San Jose. Thanks also to C. Bright, W.
Keel, P. Greenhall, and L. Ward of the National Museum of Natural
History, Smithsonian Institution for their assistance during the first
author's visit to the Museum Support Center and for processing the type
material. The authors appreciate the indepth reviews of the manuscript
by T. Molodtsova and a second anonymous reviewer.; This work was
supported in part by the Smithsonian Institution; and Oak Ridge National
Laboratory, Oak Ridge, Tennessee. D. Opresko is a Research Associate at
the National Museum of Natural History, Smithsonian Institution, and
gratefully acknowledges that affiliation.
NR 7
TC 2
Z9 2
U1 0
U2 2
PU BIOL SOC WASHINGTON
PI WASHINGTON
PA NAT MUSEUM NAT HIST SMITHSONIAN INST, WASHINGTON, DC 20560 USA
SN 0006-324X
J9 P BIOL SOC WASH
JI Proc. Biol. Soc. Wash.
PD SEP 23
PY 2010
VL 123
IS 3
BP 234
EP 241
PG 8
WC Biology
SC Life Sciences & Biomedicine - Other Topics
GA 660UW
UT WOS:000282672900006
ER
PT J
AU Kent, MS
Murton, JK
Sasaki, DY
Satija, S
Akgun, B
Nanda, H
Curtis, JE
Majewski, J
Morgan, CR
Engen, JR
AF Kent, Michael S.
Murton, Jaclyn K.
Sasaki, Darryl Y.
Satija, Sushil
Akgun, Bulent
Nanda, Hirsh
Curtis, Joseph E.
Majewski, Jaroslaw
Morgan, Christopher R.
Engen, John R.
TI Neutron Reflectometry Study of the Conformation of HIV Nef Bound to
Lipid Membranes
SO BIOPHYSICAL JOURNAL
LA English
DT Article
ID IMMUNODEFICIENCY-VIRUS TYPE-1; AIDS-LIKE DISEASE; N-TERMINAL REGION;
TRANSGENIC MICE; SH3 DOMAIN; VIRAL INFECTIVITY; CRYSTAL-STRUCTURE;
DOWN-REGULATION; PROTEIN-KINASE; IMMUNE CELLS
AB Nef is an HIV-1 accessory protein that directly contributes to AIDS progression. Nef is myristoylated on the N-terminus, associates with membranes, and may undergo a transition from a solution conformation to a membrane-associated conformation. It has been hypothesized that conformational rearrangement enables membrane-associated Nef to interact with cellular proteins. Despite its medical relevance, to our knowledge there is no direct information about the conformation of membrane-bound Nef. In this work, we used neutron reflection to reveal what we believe are the first details of the conformation of membrane-bound Nef. The conformation of Nef was probed upon binding to Langmuir monolayers through the interaction of an N-terminal His tag with a synthetic metal-chelating lipid, which models one of the possible limiting cases for myr-Nef. The data indicate that residues are inserted into the lipid headgroups during interaction, and that the core domain lies directly against the lipid headgroups, with a thickness of similar to 40 angstrom. Binding of Nef through the N-terminal His tag apparently facilitates insertion of residues, as no insertion occurred upon binding of Nef through weak electrostatic interactions in the absence of the specific interaction through the His tag.
C1 [Kent, Michael S.; Murton, Jaclyn K.; Sasaki, Darryl Y.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Satija, Sushil; Akgun, Bulent; Nanda, Hirsh; Curtis, Joseph E.] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA.
[Majewski, Jaroslaw] Los Alamos Natl Lab, Los Alamos Neutron Sci Ctr, Los Alamos, NM USA.
[Morgan, Christopher R.; Engen, John R.] Northeastern Univ, Boston, MA 02115 USA.
RP Kent, MS (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM mskent@sandia.gov
RI Akgun, Bulent/H-3798-2011; Lujan Center, LANL/G-4896-2012
FU Department of Energy Office of Basic Energy Sciences; Los Alamos
National Laboratory under Department of Energy [DE-AC52-06NA25396];
National Institutes of Health [R01-GM070590, R01-GM086507]
FX This work also benefited from the use of the Lujan Neutron Scattering
Center at Los Alamos Neutron Science Center funded by the Department of
Energy Office of Basic Energy Sciences and Los Alamos National
Laboratory under Department of Energy contract DE-AC52-06NA25396. The
work was partially supported by National Institutes of Health grants
R01-GM070590 and R01-GM086507 (to J.R.E.).
NR 48
TC 10
Z9 10
U1 0
U2 12
PU CELL PRESS
PI CAMBRIDGE
PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA
SN 0006-3495
J9 BIOPHYS J
JI Biophys. J.
PD SEP 22
PY 2010
VL 99
IS 6
BP 1940
EP 1948
DI 10.1016/j.bpj.2010.07.016
PG 9
WC Biophysics
SC Biophysics
GA 654UY
UT WOS:000282197500032
PM 20858440
ER
PT J
AU Chen, Y
Jayasekera, T
Calzolari, A
Kim, KW
Nardelli, MB
AF Chen, Y.
Jayasekera, T.
Calzolari, A.
Kim, K. W.
Nardelli, M. Buongiorno
TI Thermoelectric properties of graphene nanoribbons, junctions and
superlattices
SO JOURNAL OF PHYSICS-CONDENSED MATTER
LA English
DT Article
AB Using model interaction Hamiltonians for both electrons and phonons and Green's function formalism for ballistic transport, we have studied the thermal conductance and the thermoelectric properties of graphene nanoribbons (GNR), GNR junctions and periodic superlattices. Among our findings we have established the role that interfaces play in determining the thermoelectric response of GNR systems both across single junctions and in periodic superlattices. In general, increasing the number of interfaces in a single GNR system increases the peak ZT values that are thus maximized in a periodic superlattice. Moreover, we proved that the thermoelectric behavior is largely controlled by the width of the narrower component of the junction. Finally, we have demonstrated that chevron-type GNRs recently synthesized should display superior thermoelectric properties.
C1 [Chen, Y.; Jayasekera, T.; Nardelli, M. Buongiorno] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA.
[Calzolari, A.] CNR, DEMOCRITOS Natl Simulat Ctr, IOM, Theory Elettra Grp, I-34014 Trieste, Italy.
[Kim, K. W.] N Carolina State Univ, Dept Elect & Comp Engn, Raleigh, NC 27695 USA.
[Nardelli, M. Buongiorno] Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA.
RP Chen, Y (reprint author), N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA.
RI Jayasekera, Thushari /A-3626-2011; Buongiorno Nardelli,
Marco/C-9089-2009; Calzolari, Arrigo/B-8448-2015
OI Calzolari, Arrigo/0000-0002-0244-7717
FU DARPA/HRL CERA; SWAN-NRI; NSF-CCI Center for Molecular Spintronics
[CHE-0943975]; US ARO; Office of Basic Energy Sciences, US Department of
Energy at Oak Ridge National Laboratory with UT-Battelle, LLC
[DE-AC05-00OR22725]
FX This work was supported, in part, by the DARPA/HRL CERA, SWAN-NRI, the
NSF-CCI Center for Molecular Spintronics (CHE-0943975) and US ARO. MBN
wishes to acknowledge partial support from the Office of Basic Energy
Sciences, US Department of Energy at Oak Ridge National Laboratory under
contract DE-AC05-00OR22725 with UT-Battelle, LLC. Calculations have been
run at NCCS-ORNL and HPC-NCSU.
NR 26
TC 45
Z9 45
U1 5
U2 58
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-8984
J9 J PHYS-CONDENS MAT
JI J. Phys.-Condes. Matter
PD SEP 22
PY 2010
VL 22
IS 37
AR 372202
DI 10.1088/0953-8984/22/37/372202
PG 5
WC Physics, Condensed Matter
SC Physics
GA 645AG
UT WOS:000281422700002
PM 21403189
ER
PT J
AU Wu, H
Bai, F
Sun, ZC
Haddad, RE
Boye, DM
Wang, ZW
Huang, JY
Fan, HY
AF Wu, Huimeng
Bai, Feng
Sun, Zaicheng
Haddad, Raid E.
Boye, Daniel M.
Wang, Zhongwu
Huang, Jian Yu
Fan, Hongyou
TI Nanostructured Gold Architectures Formed through High Pressure-Driven
Sintering of Spherical Nanoparticle Arrays
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID NANOPOROUS GOLD; LOW-TEMPERATURE; CATALYSTS; NANOCAGES; CELLS
AB We have demonstrated pressure-directed assembly for preparation of a new class of chemically and mechanically stable gold nanostructures through high pressure-driven sintering of nanoparticle assemblies at room temperature. We show that under a hydrostatic pressure field, the unit cell dimension of a 3D ordered nanoparticle array can be reversibly manipulated allowing fine-tuning of the interparticle separation distance. In addition, 3D nanostructured gold architecture can be formed through high pressure-induced nanoparticle sintering. This work opens a new pathway for engineering and fabrication of different metal nanostructured architectures.
C1 [Wu, Huimeng; Huang, Jian Yu; Fan, Hongyou] Sandia Natl Labs, Adv Mat Lab, Albuquerque, NM 87106 USA.
[Bai, Feng; Sun, Zaicheng; Haddad, Raid E.; Fan, Hongyou] Univ New Mexico, NSF Ctr Microengineered Mat, Albuquerque, NM 87131 USA.
[Wang, Zhongwu] Cornell Univ, Wilson Lab, Ithaca, NY 14853 USA.
[Boye, Daniel M.] Davidson Coll, Dept Phys, Davidson, NC 28035 USA.
RP Fan, HY (reprint author), Sandia Natl Labs, Adv Mat Lab, 1001 Univ Blvd SE, Albuquerque, NM 87106 USA.
EM hfan@sandia.gov
RI Sun, Zaicheng/B-5397-2012; Huang, Jianyu/C-5183-2008
OI Sun, Zaicheng/0000-0001-5277-5308;
FU US DOE BES; Sandia National Laboratories; NSF [DMI-0625897]; NIH/NIGMS
via NSF [DMR-0225180]; US DOE's National Nuclear Security Administration
[DE-AC04-94AL85000]
FX This work was supported by the US DOE BES Program, Sandia National
Laboratories' LDRD program, and NSF (DMI-0625897). STEM and TEM studies
were performed in the Center of Integrated Nanotechnologies at the
Sandia National Laboratories. CHESS is supported by the NSF and
NIH/NIGMS via NSF Award DMR-0225180. Sandia is a multiprogram laboratory
operated by Sandia Corporation, a Lockheed Martin Co., for the US DOE's
National Nuclear Security Administration under Contract
DE-AC04-94AL85000.
NR 22
TC 41
Z9 41
U1 4
U2 43
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 SEP 22
PY 2010
VL 132
IS 37
BP 12826
EP 12828
DI 10.1021/ja105255d
PG 3
WC Chemistry, Multidisciplinary
SC Chemistry
GA 652NL
UT WOS:000282013700023
PM 20804208
ER
PT J
AU Karotsis, G
Kennedy, S
Teat, SJ
Beavers, CM
Fowler, DA
Morales, JJ
Evangelisti, M
Dalgarno, SJ
Brechin, EK
AF Karotsis, Georgios
Kennedy, Stuart
Teat, Simon J.
Beavers, Christine M.
Fowler, Drew A.
Morales, Juan J.
Evangelisti, Marco
Dalgarno, Scott J.
Brechin, Euan K.
TI [Mn(4)(III)Ln(4)(III)] Calix[4]arene Clusters as Enhanced Magnetic
Coolers and Molecular Magnets
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID STRUCTURAL COORDINATION CHEMISTRY; TRANSITION-METAL; LOW-TEMPERATURE;
GROUND-STATE; FE-III; COMPLEXES; REFRIGERATION; CALIXARENES; CAPSULES;
ALCOHOLS
AB The use of methylene-bridged calix[4]arenes in 3d/4f chemistry produces a family of clusters of general formula [Mn(4)(III)Le(4)(III)(OH)(4)(C4)(4)(NO3)(2)(DMF)(6)(H2O)(6)](OH)(2) (where C4 = calix[4]arene; Ln = Gd (1), Tb (2), Dy (3)). The molecular structure describes a square of Ln(III) ions housed within a square of Mn-III ions. Magnetic studies reveal that 1 has a large number of molecular spin states that are populated even at the lowest investigated temperatures, while the ferromagnetic limit S = 22 is being approached only at the highest applied fields. This, combined with the high magnetic isotropy, makes the complex an excellent magnetic refrigerant for low-temperature applications. Replacement of the isotropic Gd-III ions with the anisotropic Tb-III and Dy-III ions "switches" the magnetic properties of the cluster so that 2 and 3 behave as low-temperature molecular magnets, displaying slow relaxation of the magnetization.
C1 [Evangelisti, Marco] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain.
[Morales, Juan J.] Univ Zaragoza, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain.
[Fowler, Drew A.] Univ Missouri, Dept Chem, Columbia, MO 65211 USA.
[Teat, Simon J.; Beavers, Christine M.] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA.
[Kennedy, Stuart; Dalgarno, Scott J.] Heriot Watt Univ, Sch Engn & Phys Sci Chem, Edinburgh EH14 4AS, Midlothian, Scotland.
[Karotsis, Georgios; Brechin, Euan K.] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JJ, Midlothian, Scotland.
RP Evangelisti, M (reprint author), Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain.
EM evange@unizar.es; s.j.dalgarno@hw.ac.uk; ebrechin@staffmail.ed.ac.uk
RI Beavers, Christine/C-3539-2009; Kennedy, Stuart/D-5248-2014; Brechin,
Euan/M-5130-2014; Evangelisti, Marco/B-5878-2011; Dalgarno,
Scott/A-7358-2010
OI Beavers, Christine/0000-0001-8653-5513; Kennedy,
Stuart/0000-0002-1769-8797; Brechin, Euan/0000-0002-9365-370X;
Evangelisti, Marco/0000-0002-8028-9064; Dalgarno,
Scott/0000-0001-7831-012X
FU EPSRC; Leverhulme Trust; Heriot-Watt University; Spanish Ministry for
Science and Innovation [MAT2009-13977-C03, CSD2007-0010]; Office of
Science, Office of Basic Energy Sciences, of the U.S. Department of
Energy [DE-AC02-05CH11231]
FX E.K.B. and S.J.D. thank the EPSRC and Leverhulme Trust for funding and
Heriot-Watt University for a studentship (S.K.). M.E. thanks the Spanish
Ministry for Science and Innovation for grants MAT2009-13977-C03 and
CSD2007-0010. 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 50
TC 178
Z9 180
U1 1
U2 76
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 SEP 22
PY 2010
VL 132
IS 37
BP 12983
EP 12990
DI 10.1021/ja104848m
PG 8
WC Chemistry, Multidisciplinary
SC Chemistry
GA 652NL
UT WOS:000282013700049
PM 20677762
ER
PT J
AU Zajdel, P
Hsieh, PY
Rodriguez, EE
Butch, NP
Magill, JD
Paglione, J
Zavalij, P
Suchomel, MR
Green, MA
AF Zajdel, Pawel
Hsieh, Ping-Yen
Rodriguez, Efrain E.
Butch, Nicholas P.
Magill, Jeff D.
Paglione, Johnpierre
Zavalij, Peter
Suchomel, Matthew R.
Green, Mark A.
TI Phase Separation and Suppression of the Structural and Magnetic
Transitions in Superconducting Doped Iron Tellurides, Fe1+xTe1-ySy
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID LAYERED QUATERNARY COMPOUND; CRYSTAL-STRUCTURE; DIAGRAM; LIFEAS
AB Single crystal and powder samples of the series of iron chalcogenide superconductors with nominal composition, Fe1.15Te1-ySy, are found to form for 0 <= y <= 0.15. They crystallize in the tetragonal anti-PbO structure, which is composed of layers of edge-shared Fe(Te, S)(4) tetrahedra. For y = 0, Fe1+xTe (x approximate to 0.12(1)) is nonsuperconducting and undergoes a tetragonal (P4/nmm) to monoclinic (P2(1)/m) structural transition at similar to 65 K, associated with the onset of commensurate antiferromagnetic order at q = (0.5 0 0.5). We show that on sulfur substitution, Fe1+xTe1-ySy becomes orthorhombic (Pmmn) at low temperature for 0 <= y <= 0.15, where the greatly suppressed magnetic scattering is now incommensurate at q = (0.5-delta 0 0.5) and possesses short ranged magnetic correlations that are well fitted with a two-dimensional Warren peak shape. At much higher concentrations of S (y >= 0.075), there is suppression of both the structural and magnetic transitions and a superconducting transition at 9 K is observed. Between these two composition regimes, there exists a region of phase separation (0.025 <= y <= 0.05), where the low temperature neutron diffraction data is best refined with a model containing both the tetragonal and orthorhombic phases. The increase in the amount of sulfur is found to be associated with a reduction in interstitial iron, x. Microprobe analysis of a single crystal of composition Fe1.123(5)Te0.948(4)S0.052(4) confirms the presence of compositional variation within the crystals, rationalizing the observed phase separation.
C1 [Zajdel, Pawel; Hsieh, Ping-Yen; Rodriguez, Efrain E.; Green, Mark A.] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20878 USA.
[Hsieh, Ping-Yen; Green, Mark A.] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA.
[Zavalij, Peter] Univ Maryland, Dept Chem, College Pk, MD 20742 USA.
[Butch, Nicholas P.; Magill, Jeff D.; Paglione, Johnpierre] Univ Maryland, Ctr Nanophys & Adv Mat, College Pk, MD 20742 USA.
[Suchomel, Matthew R.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RP Green, MA (reprint author), NIST, NIST Ctr Neutron Res, 100 Bur Dr, Gaithersburg, MD 20878 USA.
EM mark.green@nist.gov
RI Zavalij, Peter/H-3817-2012; Zajdel, Pawel/B-7574-2013; Rodriguez,
Efrain/N-1928-2013; Suchomel, Matthew/C-5491-2015;
OI Zavalij, Peter/0000-0001-5762-3469; Zajdel, Pawel/0000-0003-1220-5866;
Rodriguez, Efrain/0000-0001-6044-1543; SUCHOMEL,
Matthew/0000-0002-9500-5079
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-06CH11357]
FX Use of the Advanced Photon Source 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 47
TC 36
Z9 36
U1 2
U2 46
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 SEP 22
PY 2010
VL 132
IS 37
BP 13000
EP 13007
DI 10.1021/ja105279p
PG 8
WC Chemistry, Multidisciplinary
SC Chemistry
GA 652NL
UT WOS:000282013700051
PM 20806923
ER
PT J
AU Kliewer, CJ
Aliaga, C
Bieri, M
Huang, WY
Tsung, CK
Wood, JB
Komvopoulos, K
Somorjai, GA
AF Kliewer, Christopher J.
Aliaga, Cesar
Bieri, Marco
Huang, Wenyu
Tsung, Chia-Kuang
Wood, Jennifer B.
Komvopoulos, Kyriakos
Somorjai, Gabor A.
TI Furan Hydrogenation over Pt(111) and Pt(100) Single-Crystal Surfaces and
Pt Nanoparticles from 1 to 7 nm: A Kinetic and Sum Frequency Generation
Vibrational Spectroscopy Study
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID HIGH-PRESSURE; PYRROLE HYDROGENATION; ULTRAHIGH-VACUUM; STRUCTURE
SENSITIVITY; MESOPOROUS SILICA; IN-SITU; BENZENE; ADSORPTION; THIOPHENE;
DEHYDROGENATION
AB Sum frequency generation surface vibrational spectroscopy and kinetic measurements using gas chromatography have been used to systematically study the adsorption and hydrogenation of furan over Pt(111) and Pt(100) single-crystal surfaces and size-controlled 1.0-nm, 3.5-nm and 7.0-nm Pt nanoparticles at Torr pressures (10 Torr of furan, 100 Torr of H(2)) to form dihydrofuran, tetrahydrofuran, and the ring-cracking products butanol and propylene. As determined by SFG, the furan ring lies parallel to all Pt surfaces studied under hydrogenation conditions. Upright THF and the oxametallacycle intermediate are observed over the nanoparticle catalysts under reaction conditions. Butoxy increases in surface concentration over Pt(111) with increasing temperature in agreement with selectivity trends.
C1 [Kliewer, Christopher J.; Aliaga, Cesar; Bieri, Marco; Huang, Wenyu; Tsung, Chia-Kuang; Wood, Jennifer B.; Somorjai, Gabor A.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Komvopoulos, Kyriakos] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA.
[Kliewer, Christopher J.; Aliaga, Cesar; Bieri, Marco; Huang, Wenyu; Tsung, Chia-Kuang; Wood, Jennifer B.; Somorjai, Gabor A.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Somorjai, GA (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
EM somorjai@socrates.berkeley.edu
RI Kliewer, Christopher/E-4070-2010; Huang, Wenyu/L-3784-2014
OI Kliewer, Christopher/0000-0002-2661-1753; Huang,
Wenyu/0000-0003-2327-7259
FU Office of Energy Research, Office of Basic Energy Sciences, and
Materials Sciences Division of the U.S. Department of Energy
[DE-AC02-05CH11231]; Swiss National Science Foundation (SNF)
FX This work was supported by the Director, Office of Energy Research,
Office of Basic Energy Sciences, and Materials Sciences Division of the
U.S. Department of Energy under Contract DE-AC02-05CH11231. M.B. thanks
the Swiss National Science Foundation (SNF) for financial support.
NR 39
TC 56
Z9 56
U1 8
U2 95
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 SEP 22
PY 2010
VL 132
IS 37
BP 13088
EP 13095
DI 10.1021/ja105800z
PG 8
WC Chemistry, Multidisciplinary
SC Chemistry
GA 652NL
UT WOS:000282013700060
PM 20795670
ER
PT J
AU Zhang, HL
Fontes, CJ
Ballance, CP
AF Zhang, Hong Lin
Fontes, Christopher J.
Ballance, Connor P.
TI Comment on "Dirac R-matrix method for the calculation of x-ray line
polarization"
SO PHYSICAL REVIEW A
LA English
DT Letter
ID HIGHLY-CHARGED IONS; EXCITATION; SUBLEVELS; IRON
AB In a recent article by Chen et al. [Phys. Rev. A 79, 062715 (2009)], reference is made to magnetic sublevel collision strengths in an earlier relativistic distorted-wave (RDW) article by Zhang et al. [Phys. Rev. A 41, 198 (1990)]. In the former reference, Chen et al. carried out Dirac R-matrix calculations that suggest the polarization of the 3C and 3D lines of Fe XVII, which can be computed from the magnetic sublevel collision strengths, differ from RDW results by as much as 20%. We have recently carried out a variety of RDW and Dirac R-matrix calculations of the 3C and 3D polarizations that demonstrate this quantity to be relatively insensitive to the size and details of the atomic model. Moreover, the polarizations obtained from these recent RDW and Dirac R-matrix calculations agree well, and they also agree well with the polarizations that can be obtained from the fundamental collision data published by Zhang et al. This good agreement between RDW and Dirac R-matrix polarizations contradicts the behavior reported by Chen et al.
C1 [Zhang, Hong Lin; Fontes, Christopher J.] Los Alamos Natl Lab, Computat Phys Div, Los Alamos, NM 87545 USA.
[Ballance, Connor P.] Auburn Univ, Dept Phys, Auburn, AL 36849 USA.
RP Zhang, HL (reprint author), Los Alamos Natl Lab, Computat Phys Div, POB 1663, Los Alamos, NM 87545 USA.
EM zhang@lanl.gov; cjf@lanl.gov; ballance@physics.auburn.edu
NR 18
TC 4
Z9 4
U1 0
U2 1
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 SEP 22
PY 2010
VL 82
IS 3
AR 036701
DI 10.1103/PhysRevA.82.036701
PG 5
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 653ML
UT WOS:000282095500013
ER
PT J
AU Aberg, D
Erhart, P
Crowhurst, J
Zaug, JM
Goncharov, AF
Sadigh, B
AF Aberg, Daniel
Erhart, Paul
Crowhurst, Jonathan
Zaug, Joseph M.
Goncharov, Alexander F.
Sadigh, Babak
TI Pressure-induced phase transition in the electronic structure of
palladium nitride
SO PHYSICAL REVIEW B
LA English
DT Article
ID LOCALIZED WANNIER FUNCTIONS; LASER-ABLATION; PLATINUM
AB We present a combined theoretical and experimental study of the electronic structure and equation of state (EOS) of crystalline PdN(2). The compound forms above 58 GPa in the pyrite structure and is metastable down to 11 GPa. We show that the EOS cannot be accurately described within either the local density or generalized gradient approximations. The Heyd-Scuseria-Ernzerhof exchange-correlation functional (HSE06), however, provides very good agreement with experimental data. We explain the strong pressure dependence of the Raman intensities in terms of a similar dependence of the calculated band gap, which closes just below 11 GPa. At this pressure, the HSE06 functional predicts a first-order isostructural transition accompanied by a pronounced elastic instability of the longitudinal-acoustic branches that provides the mechanism for the experimentally observed decomposition. Using an extensive Wannier function analysis, we show that the structural transformation is driven by a phase transition of the electronic structure, which is manifested by a discontinuous change in the hybridization between Pd d and N p electrons as well as a conversion from single to triple bonded nitrogen dimers. We argue for the possible existence of a critical point for the isostructural transition, at which massive fluctuations in both the electronic as well as the structural degrees of freedom are expected.
C1 [Aberg, Daniel; Erhart, Paul; Crowhurst, Jonathan; Zaug, Joseph M.; Sadigh, Babak] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94551 USA.
[Goncharov, Alexander F.] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA.
RP Aberg, D (reprint author), Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94551 USA.
EM aberg2@llnl.gov
RI Erhart, Paul/G-6260-2011;
OI Erhart, Paul/0000-0002-2516-6061; Aberg, Daniel/0000-0003-4364-9419
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]; U.S. Department of Energy, Office of Science,
Office of Basic Energy Sciences [DE-SC0001057]
FX This work was performed under the auspices of the U.S. Department of
Energy by Lawrence Livermore National Laboratory in part under Contract
No. DE-AC52-07NA27344, as well as being based on work supported as part
of the EFree, an Energy Frontier Research Center funded by the U.S.
Department of Energy, Office of Science, Office of Basic Energy Sciences
under Award No. DE-SC0001057.
NR 33
TC 18
Z9 18
U1 5
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 SEP 22
PY 2010
VL 82
IS 10
AR 104116
DI 10.1103/PhysRevB.82.104116
PG 9
WC Physics, Condensed Matter
SC Physics
GA 653UL
UT WOS:000282122400002
ER
PT J
AU Bose, PP
Mittal, R
Chaplot, SL
Loong, CK
Boatner, LA
AF Bose, Preyoshi P.
Mittal, R.
Chaplot, S. L.
Loong, C. -K.
Boatner, L. A.
TI Inelastic neutron scattering, lattice dynamics, and high-pressure phase
stability of zircon-structured lanthanide orthophosphates
SO PHYSICAL REVIEW B
LA English
DT Article
ID ORTHO-PHOSPHATES; MONAZITE; LUPO4; COMPRESSIBILITY; DEPENDENCE;
XENOTIME; CRYSTALS; YBPO4
AB Inelastic neutron-scattering experiments and lattice-dynamical calculations are reported on a series of rare-earth orthophosphates RPO4 (R=Tm, Er, Ho, and Tb). The experimental phonon spectra for the compounds are in good agreement with our model calculations. The lattice-dynamical model is found useful for the calculation of various thermodynamic properties such as the lattice specific heat, thermal expansion, and equation of state of these compounds. The RPO4 compounds are known to transform to the scheelite (body-centered tetragonal, I4(1)/a) or monoclinic phase (P2(1)/n) at high pressures. Our calculations show that while the scheelite phase stabilizes at high pressure due to its lower volume, the monoclinic phase may occur as an intermediate phase depending on the ionic size of the R atom. The latter phase is stabilized at higher temperature (at high pressure) due to its high vibrational entropy. A pressure-temperature phase diagram is proposed.
C1 [Bose, Preyoshi P.; Mittal, R.; Chaplot, S. L.] Bhabha Atom Res Ctr, Div Solid State Phys, Mumbai 400085, Maharashtra, India.
[Loong, C. -K.] Sun Yat Sen Univ, Sch Phys & Engn, Guangzhou 510275, Peoples R China.
[Boatner, L. A.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Bose, PP (reprint author), Bhabha Atom Res Ctr, Div Solid State Phys, Mumbai 400085, Maharashtra, India.
RI Boatner, Lynn/I-6428-2013
OI Boatner, Lynn/0000-0002-0235-7594
FU U.S. DOE-BES [W-31-109-ENG-38]; Division of Materials Sciences and
Engineering, Office of Basic Energy Sciences, U.S. Department of Energy
FX Works performed at Argonne and Oak Ridge National Laboratory is
supported by the U.S. DOE-BES under Contract No. W-31-109-ENG-38 and by
the Division of Materials Sciences and Engineering, Office of Basic
Energy Sciences, U.S. Department of Energy, respectively.
NR 36
TC 5
Z9 5
U1 0
U2 16
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 SEP 22
PY 2010
VL 82
IS 9
AR 094309
DI 10.1103/PhysRevB.82.094309
PG 8
WC Physics, Condensed Matter
SC Physics
GA 653MX
UT WOS:000282096700004
ER
PT J
AU El-Khatib, S
Bose, S
He, C
Kuplic, J
Laver, M
Borchers, JA
Huang, Q
Lynn, JW
Mitchell, JF
Leighton, C
AF El-Khatib, S.
Bose, Shameek
He, C.
Kuplic, J.
Laver, M.
Borchers, J. A.
Huang, Q.
Lynn, J. W.
Mitchell, J. F.
Leighton, C.
TI Spontaneous formation of an exchange-spring composite via magnetic phase
separation in Pr1-xCaxCoO3
SO PHYSICAL REVIEW B
LA English
DT Article
ID SPIN-STATE TRANSITION; MANGANITES; POLARONS; LACOO3
AB We present a neutron-diffraction, small-angle scattering, and magnetometry study of the narrow bandwidth perovskite cobaltite Pr1-xCaxCoO3, demonstrating an unusual form of magnetoelectronic phase separation where long-range ordered ferromagnetism coexists spatially with short-range ferromagnetism. The two phases have very different coercivities and, remarkably, are strongly exchange coupled. The electronic phase separation thus leads to spontaneous formation of a hard-soft nanocomposite, exhibiting prototypical exchange-spring behavior in the absence of chemical interfaces.
C1 [El-Khatib, S.; Bose, Shameek; He, C.; Kuplic, J.; Leighton, C.] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA.
[El-Khatib, S.; Laver, M.; Borchers, J. A.; Huang, Q.; Lynn, J. W.] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA.
[El-Khatib, S.; Laver, M.] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA.
[Mitchell, J. F.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
RP Leighton, C (reprint author), Univ Minnesota, Dept Chem Engn & Mat Sci, 421 Washington Ave SE, Minneapolis, MN 55455 USA.
EM leighton@umn.edu
FU DOE [DE-FG02-06ER46275, DE-AC02-06CH11357]; NSF [DMR-0804432]
FX Work at UMN supported by DOE (Grant No. DE-FG02-06ER46275, neutron
scattering) and NSF (Grant No. DMR-0804432). Work at ANL supported by
DOE (Grant No. DE-AC02-06CH11357)
NR 36
TC 15
Z9 15
U1 0
U2 21
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 SEP 22
PY 2010
VL 82
IS 10
AR 100411
DI 10.1103/PhysRevB.82.100411
PG 4
WC Physics, Condensed Matter
SC Physics
GA 653UL
UT WOS:000282122400001
ER
PT J
AU Broda, R
Wrzesinski, J
Gadea, A
Marginean, N
Fornal, B
Corradi, L
Stefanini, AM
Krolas, W
Pawlat, T
Szpak, B
Lunardi, S
Valiente-Dobon, JJ
Mengoni, D
Farnea, E
Carpenter, MP
De Angelis, G
Della Vedova, F
Fioretto, E
Guiot, B
Janssens, RVF
Mantica, PF
Mason, P
Montagnoli, G
Napoli, DR
Orlandi, R
Pokrovskiy, I
Pollarolo, G
Sahin, E
Scarlassara, F
Silvestri, R
Szilner, S
Ur, CA
Trotta, M
Zhu, S
AF Broda, R.
Wrzesinski, J.
Gadea, A.
Marginean, N.
Fornal, B.
Corradi, L.
Stefanini, A. M.
Krolas, W.
Pawlat, T.
Szpak, B.
Lunardi, S.
Valiente-Dobon, J. J.
Mengoni, D.
Farnea, E.
Carpenter, M. P.
De Angelis, G.
Della Vedova, F.
Fioretto, E.
Guiot, B.
Janssens, R. V. F.
Mantica, P. F.
Mason, P.
Montagnoli, G.
Napoli, D. R.
Orlandi, R.
Pokrovskiy, I.
Pollarolo, G.
Sahin, E.
Scarlassara, F.
Silvestri, R.
Szilner, S.
Ur, C. A.
Trotta, M.
Zhu, S.
TI Proton-hole states in the N=30 neutron-rich isotope K-49
SO PHYSICAL REVIEW C
LA English
DT Article
ID NUCLEAR-DATA SHEETS; HEAVY-ION REACTIONS; MAGNETIC SPECTROMETER;
SHELL-MODEL; BETA-DECAY; DEFORMATION; PRISMA; CA-52
AB Excited states in the N = 30 neutron-rich isotope K-49 have been studied using multinucleon transfer reactions with thin targets and the PRISMA-CLARA spectrometer combined with thick-target gamma-coincidence data from Gammasphere. The d(3/2) proton-hole state is located 92 keV above the s(1/2) ground state, and the proton-particle f(7/2) state is suggested at 2104 keV. Three other levels are established as involving the coupling to 2(+) of two neutrons above the N = 28 shell. The measured or estimated lifetimes served to reinforce the interpretation of the observed level structure, which is found to be in satisfactory agreement with shell-model calculations.
C1 [Broda, R.; Wrzesinski, J.; Fornal, B.; Krolas, W.; Pawlat, T.; Szpak, B.] Niewodniczanski Inst Nucl Phys PAN, Krakow, Poland.
[Gadea, A.; Marginean, N.; Corradi, L.; Stefanini, A. M.; Valiente-Dobon, J. J.; De Angelis, G.; Della Vedova, F.; Fioretto, E.; Guiot, B.; Napoli, D. R.; Orlandi, R.; Pokrovskiy, I.; Sahin, E.; Silvestri, R.] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.
[Lunardi, S.; Mengoni, D.; Farnea, E.; Mason, P.; Montagnoli, G.; Scarlassara, F.; Ur, C. A.] Univ Padua, Dipartimento Fis, Padua, Italy.
[Lunardi, S.; Mengoni, D.; Farnea, E.; Mason, P.; Montagnoli, G.; Scarlassara, F.; Ur, C. A.] Ist Nazl Fis Nucl, Sez Padova, Padua, Italy.
[Trotta, M.] Ist Nazl Fis Nucl, Sez Napoli, Naples, Italy.
[Carpenter, M. P.; Janssens, R. V. F.; Zhu, S.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Mantica, P. F.] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA.
[Marginean, N.] Natl Inst Phys & Nucl Engn, Bucharest, Romania.
[Szilner, S.] Rudjer Boskovic Inst, Zagreb, Croatia.
[Gadea, A.] Univ Valencia, CSIC, Inst Fis Corpuscular, E-46003 Valencia, Spain.
[Mengoni, D.] Univ W Scotland, Sch Sci & Engn, Paisley, Renfrew, Scotland.
[Pollarolo, G.] Univ Turin, Dipartimento Fis Teor, Turin, Italy.
RP Broda, R (reprint author), Niewodniczanski Inst Nucl Phys PAN, Krakow, Poland.
RI Krolas, Wojciech/N-9391-2013; Gadea, Andres/L-8529-2014; Carpenter,
Michael/E-4287-2015; Marginean, Nicolae Marius/C-4732-2011; Napoli,
Daniel R./D-9863-2012
OI Gadea, Andres/0000-0002-4233-1970; Carpenter,
Michael/0000-0002-3237-5734; Napoli, Daniel R./0000-0002-8154-6958
FU European Commission [RII3-CT2004-506065]; Polish Scientific Committee [1
PO3B 059 29]; US Dept. of Energy, Office of Nuclear Physics
[DE-AC02-06CH11357]; [PN2-ID-359/CNCSIS]
FX This work was partially supported by the European Commission within the
Sixth Framework Programme through I3-EURONS (Contract No.
RII3-CT2004-506065), the Polish Scientific Committee Grant No. 1 PO3B
059 29, the Romanian Grant No. PN2-ID-359/CNCSIS, and the US Dept. of
Energy, Office of Nuclear Physics under Contract No. DE-AC02-06CH11357.
NR 37
TC 9
Z9 9
U1 0
U2 7
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 SEP 22
PY 2010
VL 82
IS 3
AR 034319
DI 10.1103/PhysRevC.82.034319
PG 7
WC Physics, Nuclear
SC Physics
GA 653WV
UT WOS:000282129500001
ER
PT J
AU Maingi, R
Bell, RE
Canik, JM
Gerhardt, SP
Kaye, SM
LeBlanc, BP
Osborne, TH
Bell, MG
Fredrickson, ED
Lee, KC
Menard, JE
Park, JK
Sabbagh, SA
AF Maingi, R.
Bell, R. E.
Canik, J. M.
Gerhardt, S. P.
Kaye, S. M.
LeBlanc, B. P.
Osborne, T. H.
Bell, M. G.
Fredrickson, E. D.
Lee, K. C.
Menard, J. E.
Park, J. -K.
Sabbagh, S. A.
CA NSTX Team
TI Triggered Confinement Enhancement and Pedestal Expansion in
High-Confinement-Mode Discharges in the National Spherical Torus
Experiment
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID DIII-D TOKAMAK; PLASMAS
AB We report observation of a new high performance regime in discharges in the National Spherical Torus Experiment, where the H mode edge "pedestal" temperature doubles and the energy confinement increases by 50%. The spontaneous transition is triggered by a large edge-localized mode, either natural or externally triggered by 3D fields. The transport barrier grows inward from the edge, with a doubling of both the pedestal pressure width and the spatial extent of steep radial electric field shear. The dynamics suggest that 3D fields could be applied to reduce edge transport in fusion devices.
C1 [Maingi, R.; Canik, J. M.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
[Bell, R. E.; Gerhardt, S. P.; Kaye, S. M.; LeBlanc, B. P.; Bell, M. G.; Fredrickson, E. D.; Menard, J. E.; Park, J. -K.] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
[Osborne, T. H.] Gen Atom Co, San Diego, CA 92121 USA.
[Lee, K. C.] Univ Calif Davis, Davis, CA 95616 USA.
[Sabbagh, S. A.] Columbia Univ, New York, NY 10027 USA.
RP Maingi, R (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RI Sabbagh, Steven/C-7142-2011;
OI Canik, John/0000-0001-6934-6681; Menard, Jonathan/0000-0003-1292-3286
FU U.S. Department of Energy [DE-AC05-00OR22725, DE-AC02-09CH11466,
DE-FC02-04ER54698, DE-FG02-99ER54518, DE-FG02-99ER54524]
FX This research was supported by the U.S. Department of Energy under
Contracts DE-AC05-00OR22725, DE-AC02-09CH11466, DE-FC02-04ER54698, and
grants DE-FG02-99ER54518 and DE-FG02-99ER54524. We gratefully
acknowledge the contribution of the NSTX technical staff and neutral
beam operations staff, as well as useful discussions with J. H. Harris.
NR 23
TC 24
Z9 25
U1 0
U2 2
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 SEP 22
PY 2010
VL 105
IS 13
AR 135004
DI 10.1103/PhysRevLett.105.135004
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653AP
UT WOS:000282054600003
PM 21230781
ER
PT J
AU Purdy, TP
Brooks, DWC
Botter, T
Brahms, N
Ma, ZY
Stamper-Kurn, DM
AF Purdy, T. P.
Brooks, D. W. C.
Botter, T.
Brahms, N.
Ma, Z. -Y.
Stamper-Kurn, D. M.
TI Tunable Cavity Optomechanics with Ultracold Atoms
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
DE We present an atom-chip-based realization of quantum cavity
optomechanics with cold atoms localized; within a Fabry-Perot cavity.
Effective subwavelength positioning of the atomic ensemble allows for
tuning; the linear and quadratic optomechanical coupling parameters;
varying the sensitivity to the displacement; and strain of a
compressible gaseous medium. We observe effects of such tuning on cavity
optical; nonlinearity and optomechanical frequency shifts; providing
their first characterization in the quadratic-coupling; regime.
ID QUANTUM-NOISE REDUCTION; RADIATION-PRESSURE; MICROMIRROR; BACKACTION;
MIRROR
C1 [Purdy, T. P.; Brooks, D. W. C.; Botter, T.; Brahms, N.; Ma, Z. -Y.; Stamper-Kurn, D. M.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Stamper-Kurn, D. M.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Purdy, TP (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM dmsk@berkeley.edu
RI Stamper-Kurn, Dan/B-5442-2015
OI Stamper-Kurn, Dan/0000-0002-4845-5835
FU NSF; AFOSR; Le Fonds Quebecois de la Recherche sur la Nature et les
Technologies; Miller Institute for Basic Research in Science
FX This work was supported by the NSF and the AFOSR. T.B. acknowledges
support from Le Fonds Quebecois de la Recherche sur la Nature et les
Technologies, and D.M.S.-K. from the Miller Institute for Basic Research
in Science.
NR 21
TC 101
Z9 101
U1 3
U2 27
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 SEP 22
PY 2010
VL 105
IS 13
AR 133602
DI 10.1103/PhysRevLett.105.133602
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653AP
UT WOS:000282054600001
PM 21230775
ER
PT J
AU Witzel, WM
Shabaev, A
Hellberg, CS
Jacobs, VL
Efros, AL
AF Witzel, Wayne M.
Shabaev, Andrew
Hellberg, C. Stephen
Jacobs, Verne L.
Efros, Alexander L.
TI Quantum Simulation of Multiple-Exciton Generation in a Nanocrystal by a
Single Photon
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID EFFICIENCY CARRIER MULTIPLICATION; SEMICONDUCTOR NANOCRYSTALS;
MULTIEXCITON GENERATION; COLLOIDAL PBSE; DOTS
AB We have shown theoretically that efficient multiple-exciton generation (MEG) by a single photon can be observed in small nanocrystals. Our quantum simulations that include hundreds of thousands of exciton and multiexciton states demonstrate that the complex time-dependent dynamics of these states in a closed electronic system yields a saturated MEG effect on a picosecond time scale. Including phonon relaxation confirms that efficient MEG requires the exciton-biexciton coupling time to be faster than exciton relaxation time.
C1 [Witzel, Wayne M.; Hellberg, C. Stephen; Jacobs, Verne L.; Efros, Alexander L.] USN, Res Lab, Washington, DC 20375 USA.
[Witzel, Wayne M.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Shabaev, Andrew] George Mason Univ, Fairfax, VA 22030 USA.
RP Witzel, WM (reprint author), USN, Res Lab, Washington, DC 20375 USA.
FU ONR; NIST [70NANB7H6138 Am 001]; Center for Advanced Solar Photophysics,
a DOE Energy Frontier Research Center; U.S. Department of Energy's
National Nuclear Security Administration [DE-AC04-94AL85000]
FX We thank Andrew Taube for important scientific advice. We acknowledge
financial support from ONR. A.S. acknowledges support from NIST
70NANB7H6138 Am 001, and Center for Advanced Solar Photophysics, a DOE
Energy Frontier Research Center. Sandia National Laboratories is a
multiprogram laboratory operated by Sandia Corporation, a wholly owned
subsidiary of Lockheed Martin Corporation, for the U.S. Department of
Energy's National Nuclear Security Administration under Contract No
DE-AC04-94AL85000.
NR 29
TC 46
Z9 46
U1 1
U2 23
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 SEP 22
PY 2010
VL 105
IS 13
AR 137401
DI 10.1103/PhysRevLett.105.137401
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653AP
UT WOS:000282054600006
PM 21230809
ER
PT J
AU Bai, S
Aryshev, A
Bambade, P
Mc Cormick, D
Bolzon, B
Gao, J
Tauchi, T
Zhou, F
AF Bai, Sha
Aryshev, Alexander
Bambade, Philip
Mc Cormick, Doug
Bolzon, Benoit
Gao, Jie
Tauchi, Toshiaki
Zhou, Feng
TI First beam waist measurements in 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 The ATF2 project is the final focus system prototype for the ILC and CLIC linear collider projects, with a purpose to reach a 37 nm vertical beam size at the interaction point using compact optics based on a novel scheme of local chromaticity correction. Construction of all components and installation were completed at the end of 2008. An initial commissioning phase followed in 2009, using larger than nominal beta functions at the interaction point, corresponding to reduced demagnification factors in comparison to the design, to limit effects from higher-order optical aberrations and hence simplify beam tuning procedures while key instrumentation was being tested and calibrated. In this paper, first measurements of dispersion and Twiss parameters are presented based on scanning the beam during this period with a set of tungsten wires located just behind the interaction point, using two complementary analysis methods.
C1 [Bai, Sha; Gao, Jie] IHEP, Beijing, Peoples R China.
[Aryshev, Alexander; Bambade, Philip; Tauchi, Toshiaki] Natl Lab High Energy Phys, KEK, Tsukuba, Ibaraki 305, Japan.
[Bambade, Philip] Univ Paris 11, CNRS, LAL, IN2P3, F-91405 Orsay, France.
[Mc Cormick, Doug; Zhou, Feng] SLAC, Menlo Pk, CA 94025 USA.
[Bolzon, Benoit] LAPP, Annecy, France.
RP Bai, S (reprint author), IHEP, Beijing, Peoples R China.
RI Aryshev, Alexander/J-4054-2016
OI Aryshev, Alexander/0000-0002-0890-4640
FU Agence Nationale de la Recherche of the French Ministry of Research
[ATF2-IN2P3-KEK, ANR-06-BLAN-0027]; National Natural Science Foundation
of China (NSFC) [10775154, 10525525]
FX This work is supported by the Agence Nationale de la Recherche of the
French Ministry of Research (Programme Blanc, Projects No.
ATF2-IN2P3-KEK and No. ANR-06-BLAN-0027) and by the National Natural
Science Foundation of China (NSFC, Contracts No. 10775154 and No.
10525525). One of us (S. B.) would like to thank T. Tauchi, J. Urakawa,
and K. Yokoya for being hosted at KEK during extended periods in 2009 to
work on the ATF2 commissioning.
NR 15
TC 2
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 SEP 22
PY 2010
VL 13
IS 9
AR 092804
DI 10.1103/PhysRevSTAB.13.092804
PG 7
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 653AT
UT WOS:000282055100002
ER
PT J
AU Kandala, S
Yang, L
Campana, CF
Nesterov, V
Wang, XP
Richmond, MG
AF Kandala, Srikanth
Yang, Li
Campana, Charles F.
Nesterov, Vladimir
Wang, Xiaoping
Richmond, Michael G.
TI Isomerization of the diphosphine ligand
3,4-bis(diphenylphosphino)-5-methoxy-2(5H)-furanone (bmf) at a triosmium
cluster and P-C bond cleavage in the unsaturated cluster
1,1-Os-3(CO)(9)(bmf): Synthesis and X-ray diffraction structures of the
isomeric Os-3(CO)(10)(bmf) clusters and HOs3(CO)(8)(mu-C6H4)
[mu-PhPC=C(Ph2P)CH(OMe)OC(O)]
SO POLYHEDRON
LA English
DT Article
DE Osmium clusters; Ligand substitution; Diphosphine ligand; P-C
bond-activation; Crystallography
ID CRYSTAL-STRUCTURES; CHELATING ISOMERS; 2,3-BIS(DIPHENYLPHOSPHINO)MALEIC
ANHYDRIDE; OSMIUM; COORDINATION; DERIVATIVES; REACTIVITY; COMPLEXES;
FLUXIONALITY; ACTIVATION
AB The labile cluster 1,2-Os-3(CO)(10)(MeCN)(2) (1) reacts with the chiral diphosphine ligand 3,4-bis(diphenylphosphino)-5-methoxy-2(5H)-furanone (bmf) to furnish 1,2-Os-3(CO)(10)(bmf) (2a) in high yield. Heating cluster 2a over the temperature range 358-383 K under CO leads to isomerization of the bmf ligand and formation of the diphosphine-chelated cluster 1,1-Os-3(CO)(10)(bmf) (2b) and an equilibrium mixture consisting of 2a and 2b in a 15:85 ratio. Extended thermolysis of an equilibrium mixture of Os-3(CO)(10)(bmf) is accompanied by CO loss and ortho-metalation of an aryl ring to afford an inseparable mixture of three diastereomeric hydride clusters HOs3(CO)(9)(C29H23O3P2) (3a-c). Thermolysis of HOs3 (CO)(9)(C29H23O3P2) (3a-c) in refluxing toluene leads to P-C bond cleavage and formation of the benzyne-substituted clusters HOs3(CO)(8)(mu-C6H4)(mu-C23H19O3P2) (4a,b) as a 4:1 mixture of diastereomers. The unequivocal identity of the major benzyne-substituted cluster has been determined by X-ray diffraction analysis, where the activation of one of the phenyl groups situated a to the furanone carbonyl group in the bmf ligand has been established. The isomerization and activation of the bmf ligand are contrasted with other Os-3(CO)(10)(diphosphine) derivatives prepared by our groups. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Kandala, Srikanth; Yang, Li; Nesterov, Vladimir; Richmond, Michael G.] Univ N Texas, Dept Chem, Denton, TX 76203 USA.
[Campana, Charles F.] Bruker AXS Inc, Madison, WI 53711 USA.
[Wang, Xiaoping] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA.
RP Richmond, MG (reprint author), Univ N Texas, Dept Chem, Denton, TX 76203 USA.
EM cobalt@unt.edu
RI Wang, Xiaoping/E-8050-2012
OI Wang, Xiaoping/0000-0001-7143-8112
FU Robert A. Welch Foundation [B-1093-MGR]; US Department of Energy, Office
of Science [DE-AC05-00OR22725]
FX Financial support from the Robert A. Welch Foundation (Grant B-1093-MGR)
is greatly appreciated. X. Wang acknowledges the support by the US
Department of Energy, Office of Science, under Contract No.
DE-AC05-00OR22725 managed by UT Battelle, LLC. Prof. Arnold Rheingold is
thanked for his hospitality and the use of his X-ray diffractometer that
was used to collect the X-ray data on the isomeric clusters 2a,b during
the 2004 ACS-PRF summer school on Crystallography for Organic Chemists.
NR 49
TC 5
Z9 5
U1 1
U2 2
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0277-5387
J9 POLYHEDRON
JI Polyhedron
PD SEP 22
PY 2010
VL 29
IS 14
BP 2814
EP 2821
DI 10.1016/j.poly.2010.07.003
PG 8
WC Chemistry, Inorganic & Nuclear; Crystallography
SC Chemistry; Crystallography
GA 654WT
UT WOS:000282202500008
ER
PT J
AU Heath, L
Frenkel, LM
Foley, BT
Mullins, JI
AF Heath, Laura
Frenkel, Lisa M.
Foley, Brian T.
Mullins, James I.
TI Comment on "The Origins of Sexually Transmitted HIV Among Men Who Have
Sex with Men"
SO SCIENCE TRANSLATIONAL MEDICINE
LA English
DT Letter
ID INFECTION; DATABASES; SUPERINFECTION
AB Whether HIV from seminal cells or free HIV in semen is the origin of transmitted virus has important implications for the design of transmission prevention strategies. We found that a recent claim that HIV originates from seminal plasma and not from seminal cells was erroneous, because it was based on biological specimens that had been mislabeled, mixed-up, or contaminated. The origin of transmitted virus from semen therefore remains an open question.
C1 [Heath, Laura; Mullins, James I.] Univ Washington, Dept Microbiol, Seattle, WA 98195 USA.
[Frenkel, Lisa M.; Mullins, James I.] Univ Washington, Dept Lab Med, Seattle, WA 98195 USA.
[Frenkel, Lisa M.] Univ Washington, Dept Pediat, Seattle, WA 98195 USA.
[Frenkel, Lisa M.] Seattle Childrens Hosp, Seattle, WA 98101 USA.
[Foley, Brian T.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Mullins, James I.] Univ Washington, Dept Med, Seattle, WA 98195 USA.
RP Mullins, JI (reprint author), Univ Washington, Dept Microbiol, Seattle, WA 98195 USA.
EM jmullins@uw.edu
OI Frenkel, Lisa M/0000-0001-9566-8959; Foley, Brian/0000-0002-1086-0296
FU NIAID NIH HHS [AI27727, AI47734, P30 AI027757, R01 AI047734, R37
AI047734]
NR 10
TC 4
Z9 4
U1 0
U2 5
PU AMER ASSOC ADVANCEMENT SCIENCE
PI WASHINGTON
PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA
SN 1946-6234
J9 SCI TRANSL MED
JI Sci. Transl. Med.
PD SEP 22
PY 2010
VL 2
IS 50
AR 50le1
DI 10.1126/scitranslmed.3001416
PG 3
WC Cell Biology; Medicine, Research & Experimental
SC Cell Biology; Research & Experimental Medicine
GA 735SQ
UT WOS:000288437900003
PM 20861507
ER
PT J
AU Hammond, GE
Lichtner, PC
AF Hammond, Glenn E.
Lichtner, Peter C.
TI Field-scale model for the natural attenuation of uranium at the Hanford
300 Area using high-performance computing
SO WATER RESOURCES RESEARCH
LA English
DT Article
ID VADOSE ZONE; CONTAMINANT URANIUM; REACTIVE TRANSPORT; SEDIMENTS; SITE;
WASHINGTON; SPECIATION; URANYL; DEPTH
AB High-resolution, three-dimensional, reactive flow and transport simulations are carried out to describe the migration of hexavalent uranium [U(VI)] at the Hanford 300 Area bordering the Columbia River and to better understand the persistence of the uranium plume at the site. The computer code PFLOTRAN developed under a DOE SciDAC-2 project is employed in the simulations that are executed on ORNL's Cray XT4/XT5 supercomputer Jaguar. The conceptual model used in the simulations is based on the recognition of three distinct phases or time periods in the evolution of the U(VI) plume. These correspond to (1) initial waste emplacement; (2) initial presence of both labile and nonlabile U(VI) with an evolved U(VI) plume extending from the source region to the river boundary, representing present-day conditions; and (3) the complete removal of all nonlabile U(VI) and labile U(VI) in the vadose zone. This work focuses primarily on modeling Phase II using equilibrium and multirate sorption models for labile U(VI) and a continuous source release of nonlabile U(VI) in the South Process Pond through dissolution of metatorbernite as a surrogate mineral. For this case, rapid fluctuations in the Columbia River stage combined with the slow release of nonlabile U(VI) from contaminated sediment are found to play a predominant role in determining the migration behavior of U(VI) with sorption only a second-order effect. Nevertheless, a multirate model was essential in explaining breakthrough curves obtained from laboratory column experiments using the same sediment and is demonstrated to be important in Phase III. The calculations demonstrate that U(VI) is discharged to the river at a highly fluctuating rate in a ratchet-like behavior as the river stage rises and falls. The high-frequency fluctuations must be resolved in the model to calculate the flux of U(VI) at the river boundary. By time averaging the instantaneous flux to average out noise superimposed on the river stage fluctuations, the cumulative U(VI) flux to the river is found to increase approximately linearly with time. The flow rate and U(VI) flux are highly sensitive to the conductance boundary condition that describes the river-sediment interface. By adjusting the conductance coefficient to give a better match to the measured piezometric head, good agreement was obtained with field studies for both the mean flux of water of 10(9) kg/yr and U(VI) of 25 kg/yr at the river-aquifer boundary for a computational domain encompassing the South Process Pond. Finally, it is demonstrated that, through global mass conservation, the U(VI) leach rate from the source region is related to the U(VI) flux at the river boundary.
C1 [Hammond, Glenn E.] Pacific NW Natl Lab, Energy & Environm Directorate, Hydrol Grp, Richland, WA 99352 USA.
[Lichtner, Peter C.] Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA.
RP Hammond, GE (reprint author), Pacific NW Natl Lab, Energy & Environm Directorate, Hydrol Grp, MSIN K9-36, Richland, WA 99352 USA.
EM glenn.hammond@pnl.gov; lichtner@lanl.gov
FU U.S. Department of Energy; DOE Offices of Biological and Environmental
Research (BER); Advanced Scientific Computing Research (ASCR); Office of
Biological and Environmental Research (OBER), U.S. Department of Energy
FX We thank three anonymous reviewers who greatly improved the manuscript.
This research is supported under the U.S. Department of Energy SciDAC-2
(Scientific Discovery through Advanced Computing) program with funding
provided by DOE Offices of Biological and Environmental Research (BER)
and Advanced Scientific Computing Research (ASCR). In addition, this
research was supported by the Environmental Remediation Sciences Program
(ERSP), Office of Biological and Environmental Research (OBER), U.S.
Department of Energy, as part of the Hanford 300 Area Integrated Field
Research Challenge Project. Supercomputing resources were provided by
the DOE Office of Science Innovative and Novel Computational Impact on
Theory and Experiment (INCITE) program with allocations on NCCS Jaguar
at Oak Ridge National Laboratory.
NR 36
TC 42
Z9 42
U1 4
U2 37
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0043-1397
EI 1944-7973
J9 WATER RESOUR RES
JI Water Resour. Res.
PD SEP 22
PY 2010
VL 46
AR W09527
DI 10.1029/2009WR008819
PG 31
WC Environmental Sciences; Limnology; Water Resources
SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water
Resources
GA 759MN
UT WOS:000290249800002
ER
PT J
AU Holian, BL
Mareschal, M
Ravelo, R
AF Holian, Brad Lee
Mareschal, Michel
Ravelo, Ramon
TI Test of a new heat-flow equation for dense-fluid shock waves
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE equations of state; heat conduction; Lennard-Jones potential;
Navier-Stokes equations; shock waves
ID MOLECULAR-DYNAMICS; GAS
AB Using a recently proposed equation for the heat-flux vector that goes beyond Fourier's Law of heat conduction, we model shockwave propagation in the dense Lennard-Jones fluid. Disequilibrium among the three components of temperature, namely, the difference between the kinetic temperature in the direction of a planar shock wave and those in the transverse directions, particularly in the region near the shock front, gives rise to a new transport (equilibration) mechanism not seen in usual one-dimensional heat-flow situations. The modification of the heat-flow equation was tested earlier for the case of strong shock waves in the ideal gas, which had been studied in the past and compared to Navier-Stokes-Fourier solutions. Now, the Lennard-Jones fluid, whose equation of state and transport properties have been determined from independent calculations, allows us to study the case where potential, as well as kinetic contributions are important. The new heat-flow treatment improves the agreement with nonequilibrium molecular-dynamics simulations under strong shock wave conditions, compared to Navier-Stokes. (c) 2010 American Institute of Physics. [doi:10.1063/1.3486088]
C1 [Holian, Brad Lee] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Mareschal, Michel] Univ Libre Bruxelles, Dept Phys, B-1050 Brussels, Belgium.
[Ravelo, Ramon] Univ Texas El Paso, Dept Phys, El Paso, TX 79968 USA.
[Ravelo, Ramon] Los Alamos Natl Lab, Computat Phys Div, Los Alamos, NM 87545 USA.
RP Holian, BL (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
EM blh@lanl.gov
NR 21
TC 6
Z9 6
U1 1
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 SEP 21
PY 2010
VL 133
IS 11
AR 114502
DI 10.1063/1.3486088
PG 8
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 652YC
UT WOS:000282047500025
PM 20866140
ER
PT J
AU Grosse, AM
Sterrett, SC
Maerz, JC
AF Grosse, Andrew M.
Sterrett, Sean C.
Maerz, John C.
TI Effects of Turbidity on the Foraging Success of the Eastern Painted
Turtle
SO COPEIA
LA English
DT Article
ID REACTIVE DISTANCE; BROOK TROUT; SEARCH TIME; LAND-USE; COMMUNITIES;
REDUCE; LIGHT; BASS; PREY
AB The effect of increased turbidity levels on aquatic organisms is an increasing concern for aquatic biologists. Recent studies show reduced foraging efficiency of drift-feeding fish species, which are highly visual predators, with increasing water turbidity. Similar to fish, many aquatic turtle species are highly visual aquatic predators that may be negatively affected by increasing water turbidity. We used Eastern Painted Turtles (Chrysemys picta) to test the hypothesis that increasing water turbidity would decrease prey capture efficiency. We classically conditioned eight C. picta to search for a food item when presented with a novel stimulus, and then measured the time it took each turtle to find a prey item under a range of 26 turbidity levels (<= 40 nephelometric turbidity units, NTUs) presented in a random order. All turtles were successfully trained within 29 days to search for the food item when presented with the stimulus. Turbidity had no effect on the probability of successful prey capture. Turtles located the prey item in 97% of trials regardless of turbidity level. Turbidity had a minor effect on time to prey capture, increasing from an average of 30 seconds at a turbidity level of 2 NTUs to 55 seconds at 40 NTUs. Overall, turbidity level explained approximately 2% of the variation in the time it took a turtle to locate a prey item. These results contrast sharply with a nearly identical study, which showed that turbidity explained 70% and 90% of the variation in drift-feeding fish reactive distance and prey capture success respectively, and that a turbidity of only 9-10 NTUs reduced fish foraging performance by 50%. We suggest that resilience to turbidity effects on foraging proficiency among generalist species may be important to understanding their persistence in more degraded aquatic environments compared to more specialized species.
C1 [Grosse, Andrew M.] Savannah River Ecol Lab, Aiken, SC 29802 USA.
[Grosse, Andrew M.; Sterrett, Sean C.; Maerz, John C.] Univ Georgia, DB Warnell Sch Forestry & Nat Resources, Athens, GA 30602 USA.
RP Grosse, AM (reprint author), Savannah River Ecol Lab, Savannah River Site,Bldg 737-A, Aiken, SC 29802 USA.
EM Andrew.Grosse14@gmail.com; sterretts@warnell.uga.edu;
jmaerz@warnell.uga.edu
NR 31
TC 3
Z9 3
U1 2
U2 10
PU AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS
PI CHARLESTON
PA UNIV CHARLESTON, GRICE MARINE LABORATORY, 205 FORT JOHNSON RD,
CHARLESTON, SC 29412 USA
SN 0045-8511
J9 COPEIA
JI Copeia
PD SEP 21
PY 2010
IS 3
BP 463
EP 467
DI 10.1643/CE-09-162
PG 5
WC Zoology
SC Zoology
GA 655PL
UT WOS:000282261800015
ER
PT J
AU Leung, BO
Hitchcock, AP
Brash, JL
Scholl, A
Doran, A
AF Leung, Bonnie O.
Hitchcock, Adam P.
Brash, John L.
Scholl, Andreas
Doran, Andrew
TI An X-ray Spectromicroscopy Study of Protein Adsorption to
Polystyrene-Poly(ethylene oxide) Blends
SO LANGMUIR
LA English
DT Article
ID MULTICOMPONENT POLYMER SYSTEMS; ADVANCED LIGHT-SOURCE; POLY(ETHYLENE
OXIDE); PHOTOELECTRON-SPECTROSCOPY; TRIBLOCK COPOLYMERS; BLOOD
COMPATIBILITY; DIBLOCK COPOLYMERS; POLYETHYLENE OXIDE; GRAFT-COPOLYMERS;
MOLECULAR-WEIGHT
AB Synchrotron-based X-ray photoemission electron microscopy (X-PEEM) and atomic force microscopy (A FM) were used to characterize the composition and surface morphology of thin films of a polystyrene-poly(ethylene oxide) blend (PS-PEO), spun cast from dichloromethane at various mass ratios and polymer concentrations X-PEEM reveals incomplete segregation with similar to 30% of PS in the PEO region and vice versa Protein (human scrum albumin) adsorption studies show that this partial phase separation leads to greater protein repellency in the PS region, whereas more protein is detected in the PEO region compared to control samples
C1 [Leung, Bonnie O.; Hitchcock, Adam P.] McMaster Univ, Dept Chem & Chem Biol, Hamilton, ON L8S 4M1, Canada.
[Brash, John L.] McMaster Univ, Sch Biomed Engn, Hamilton, ON L8S 4M1, Canada.
[Scholl, Andreas; Doran, Andrew] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA.
RP Hitchcock, AP (reprint author), McMaster Univ, Dept Chem & Chem Biol, Hamilton, ON L8S 4M1, Canada.
RI Scholl, Andreas/K-4876-2012;
OI Doran, Andrew/0000-0001-5158-4569
FU Natural Science and Engineering Research Council (NSERC, Canada);
AFMNet; US Department of Energy [DE-AC03-76SF00098]
FX This research is supported by the Natural Science and Engineering
Research Council (NSERC, Canada), AFMNet and the Canada Research Chair
programs X-ray microscopy was carried out using PEEM2 and STXM532 at the
ALS The ALS is supported by the US Department of Energy under Contract
DE-AC03-76SF00098
NR 52
TC 15
Z9 15
U1 1
U2 18
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0743-7463
J9 LANGMUIR
JI Langmuir
PD SEP 21
PY 2010
VL 26
IS 18
BP 14759
EP 14765
DI 10.1021/la102432g
PG 7
WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science,
Multidisciplinary
SC Chemistry; Materials Science
GA 648JV
UT WOS:000281690600055
PM 20795675
ER
PT J
AU Fornasiero, F
Bin In, J
Kim, S
Park, HG
Wang, Y
Grigoropoulos, CP
Noy, A
Bakajin, O
AF Fornasiero, Francesco
Bin In, Jung
Kim, Sangil
Park, Hyung Gyu
Wang, Yinmin
Grigoropoulos, Costas P.
Noy, Aleksandr
Bakajin, Olgica
TI pH-Tunable Ion Selectivity in Carbon Nanotube Pores
SO LANGMUIR
LA English
DT Article
ID FILLED NANOFILTRATION MEMBRANES; NANOFLUIDIC CHANNELS; ELECTROLYTIC
TRANSPORT; REVERSE-OSMOSIS; SILICON-NITRIDE; SALT REJECTION; PERMEATION;
SEPARATION; SURFACE; WATER
AB The selectivity of ion transport in nanochannels is of pi Unary importance for a number of physical, chemical, and biological processes ranging from fluid separation to ion-channel-regulated cellular processes Fundamental understanding of these phenomena requires model nanochannels with well-defined and controllable structural properties Carbon nanotubes provide an ideal choice for nanofluidic studies because of their simple chemistry and structure, the atomic scale smoothness and chemical inertness of the graphitic walls, and the tunability of their diameter and length Here, we investigate the selectivity of single and, for the first time, binary salt mixtures transport through nail ow carbon nanotubes that act as the only pores in a silicon nitride membrane. We demonstrate that negatively charged carboxylic groups are responsible for the ion rejection performance of carbon nanotube pores and that ion permeation of small salts can be tuned by varying solution Investigation of the effect of solution composition and ion valences for binary electrolytes with common cation m a pressure-driven flow reveals that the addition of slower diffusing multivalent anions to a solution of faster diffusing monovalent anions favors permeation of the monovalent anion Larger fractions and valences of the added multivalent anions lower the rejection of the monovalent anion. In some cases, we observe negative rejection at low monovalent ion content
C1 [Kim, Sangil; Bakajin, Olgica] Porifera Inc, Hayward, CA 94545 USA.
[Fornasiero, Francesco; Wang, Yinmin; Noy, Aleksandr] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA.
[Bin In, Jung; Grigoropoulos, Costas P.] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA.
[Park, Hyung Gyu] ETH, Inst Energy Technol, Dept Mech & Proc Engn, Zurich, Switzerland.
[Noy, Aleksandr] Univ Calif Merced, Sch Nat Sci, Merced, CA 95344 USA.
[Bakajin, Olgica] Univ Calif Davis, NSF Ctr Biophoton Sci & Technol, Sacramento, CA 95817 USA.
RP Bakajin, O (reprint author), Porifera Inc, Hayward, CA 94545 USA.
RI Fornasiero, Francesco/I-3802-2012; Park, Hyung Gyu/F-3056-2013; Wang,
Yinmin (Morris)/F-2249-2010
OI Park, Hyung Gyu/0000-0001-8121-2344; Wang, Yinmin
(Morris)/0000-0002-7161-2034
FU Defense Threat Reduction Agency-Joint Science and Technology Office for
Chemical and Biological Defense [BRBAA07-F-1-0066]; U S Department of
Energy, National Nuclear Security Administration [DE-AC52-07NA27344];
NSF NIRT [CBET-0709090]; DTRA [BB08PRO053]; DARPA DSO; Center for
Biophotonics, a NSF Science and Technology Center [PHY 0120999]
FX This project received partial support from the Defense Threat Reduction
Agency-Joint Science and Technology Office for Chemical and Biological
Defense (Grant BRBAA07-F-1-0066) and from Lawrence Livermore National
Laboratory Lawrence Livermore National Laboratory is operated by
Lawrence Livermore National Security, LLC, for the U S Department of
Energy, National Nuclear Security Administration under Contract
DE-AC52-07NA27344 AN, C G, S K , J B I , and O B acknowledge support by
NSF NIRT CBET-0709090 F F acknowledges support by DTRA (BB08PRO053
project) O B and S K. acknowledge support by DARPA DSO O B, also
acknowledges support by the Center for Biophotonics, a NSF Science and
Technology Center, managed by the University of California, Davis, under
Cooperative Agreement PHY 0120999.
NR 67
TC 33
Z9 33
U1 5
U2 60
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0743-7463
J9 LANGMUIR
JI Langmuir
PD SEP 21
PY 2010
VL 26
IS 18
BP 14848
EP 14853
DI 10.1021/la101943h
PG 6
WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science,
Multidisciplinary
SC Chemistry; Materials Science
GA 648JV
UT WOS:000281690600068
PM 20715879
ER
PT J
AU Chen, XQ
Wang, SB
Mao, WL
Fu, CL
AF Chen, Xing-Qiu
Wang, Shibing
Mao, Wendy L.
Fu, C. L.
TI Pressure-induced behavior of the hydrogen-dominant compound SiH4(H-2)(2)
from first-principles calculations
SO PHYSICAL REVIEW B
LA English
DT Article
ID METALLIC HYDROGEN; SOLID HYDROGEN; TEMPERATURE; PHASE;
SUPERCONDUCTIVITY; SILANE; FLUID; GPA
AB The structural and electronic properties of the high-pressure molecular compound SiH4(H-2)(2) have been calculated using density- functional theory. We identify the molecular hydrogen positions within the face-centered cubic unit cell and further find that pressure-induced intermolecular interaction between SiH4 and H-2 units plays an important role in stabilizing this new compound. The electronic structure is characterized by a wide band gap of 6.1 eV at 6.8 GPa, which closes with pressure and finally becomes metallic at 200 GPa due to electronic band overlap accompanied by a structure change. These findings have potential implications for understanding metallization and superconductivity in H-2.
C1 [Chen, Xing-Qiu] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
[Wang, Shibing] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA.
[Wang, Shibing; Mao, Wendy L.] SLAC Natl Accelerator Lab, Stanford Inst Mat & Energy Sci, Menlo Pk, CA 94025 USA.
[Mao, Wendy L.] Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA.
[Mao, Wendy L.] SLAC Natl Accelerator Lab, Photon Sci Dept, Menlo Pk, CA 94025 USA.
[Fu, C. L.] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA.
RP Chen, XQ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China.
RI Mao, Wendy/D-1885-2009
FU Chinese Academy of Science; U.S. Department of Energy, Office of Basic
Energy Sciences, Materials Sciences and Engineering Division; U.S.
Department of Energy through the Stanford Institute for Materials and
Energy Science [DE-AC02-76SF00515]
FX We thank Timothy Strobel for helpful discussions. Research at the
Shengyang National Laboratory for Materials Science (X.-Q.C.) was
supported by the Materials Processing Modeling Division and by the
"Hundred Talents Project" of Chinese Academy of Science. Research at Oak
Ridge National Laboratory (C.L.F.) was supported by the U.S. Department
of Energy, Office of Basic Energy Sciences, Materials Sciences and
Engineering Division. S.W. and W.L.M. are supported by the U.S.
Department of Energy through the Stanford Institute for Materials and
Energy Science (Grant No. DE-AC02-76SF00515)
NR 29
TC 12
Z9 12
U1 1
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 SEP 21
PY 2010
VL 82
IS 10
AR 104115
DI 10.1103/PhysRevB.82.104115
PG 5
WC Physics, Condensed Matter
SC Physics
GA 652LE
UT WOS:000282007200002
ER
PT J
AU Sochnikov, I
Shaulov, A
Yeshurun, Y
Logvenov, G
Bozovic, I
AF Sochnikov, I.
Shaulov, A.
Yeshurun, Y.
Logvenov, G.
Bozovic, I.
TI Oscillatory magnetoresistance in nanopatterned superconducting
La1.84Sr0.16CuO4 films
SO PHYSICAL REVIEW B
LA English
DT Article
ID HIGH-TEMPERATURE SUPERCONDUCTORS; FLUXOID QUANTIZATION;
TRANSITION-TEMPERATURE; RESISTIVE TRANSITION; VORTEX LATTICE;
THIN-FILMS; YBA2CU3O7; FIELD; WIRES
AB A superconducting La1.84Sr0.16CuO4 film patterned into a network of 100 x 100 nm(2) noninteracting square loops exhibits large magnetoresistance oscillations superimposed on a background which increases monotonically with the applied magnetic field. Neither the oscillations amplitude nor its temperature dependence can be explained by the Little-Parks effect. Conversely, a good quantitative agreement is obtained with a recently proposed model ascribing the oscillations to the interaction between thermally excited moving vortices and the oscillating persistent currents induced in the loops. Extension of this model, allowing for direct interaction of the vortices and antivortices magnetic moment with the applied field, accounts quantitatively for the monotonic background as well. Analysis of the background indicates that in the patterned film both vortices and antivortices are present at comparable densities. This finding is consistent with the occurrence of Berezinskii-Kosterlitz-Thouless transition in La1.84Sr0.16CuO4 films.
C1 [Sochnikov, I.; Shaulov, A.; Yeshurun, Y.] Bar Ilan Univ, Dept Phys, Inst Superconduct, IL-52900 Ramat Gan, Israel.
[Sochnikov, I.; Shaulov, A.; Yeshurun, Y.] Bar Ilan Univ, Inst Nanotechnol & Adv Mat, IL-52900 Ramat Gan, Israel.
[Logvenov, G.; Bozovic, I.] Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Sochnikov, I (reprint author), Bar Ilan Univ, Dept Phys, Inst Superconduct, IL-52900 Ramat Gan, Israel.
FU Deutsche Forschungsgemeinschaft through the Deutsch Israelische
Projektkooperation [563363]; Israel Science Foundation; US DOE
[MA-509-MACA]
FX We thank A. Bollinger, A. Frydman, A. Gozar, L. Klein, V. V. Kogan, J.
Mannhart, Y. Oreg, O. Pelleg, Z. Radovic, B. Rosenstein, B. Ya. Shapiro,
E. Shimshoni, V. Vinokur, and E. Zeldov for helpful discussions. The
work at Bar-Ilan University was supported by the Deutsche
Forschungsgemeinschaft through the Deutsch Israelische
Projektkooperation (Grant No. 563363). Y.Y. acknowledges support of the
Israel Science Foundation. I.S. thanks the Israeli Ministry of Science
and Technology. The work at BNL was supported by US DOE under Contract
No. MA-509-MACA.
NR 34
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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 SEP 21
PY 2010
VL 82
IS 9
AR 094513
DI 10.1103/PhysRevB.82.094513
PG 7
WC Physics, Condensed Matter
SC Physics
GA 652KH
UT WOS:000282004800006
ER
PT J
AU He, M
Fries, RJ
Rapp, R
AF He, Min
Fries, Rainer J.
Rapp, Ralf
TI Scaling of elliptic flow, recombination, and sequential freeze-out of
hadrons in heavy-ion collisions
SO PHYSICAL REVIEW C
LA English
DT Article
ID QUARK-GLUON PLASMA; NUCLEUS-NUCLEUS COLLISIONS; COLLABORATION;
PERSPECTIVE
AB The scaling properties of elliptic flow of hadrons produced in ultrarelativistic heavy-ion collisions are investigated at low transverse momenta, p(T) less than or similar to 2 GeV. Utilizing empirical parametrizations of a thermalized fireball with collective-flow fields, the resonance recombination model (RRM) is employed to describe hadronization via quark coalescence at the hadronization transition. We reconfirm that RRM converts equilibrium quark distribution functions into equilibrated hadron spectra including the effects of space-momentum correlations on elliptic flow. This provides the basis for a controlled extraction of quark distributions of the bulk matter at hadronization from spectra of multistrange hadrons which are beligeved to decouple close to the critical temperature. The resulting elliptic flow from empirical fits at the BNL Relativistic Heavy Ion Collider exhibits transverse kinetic-energy and valence-quark scaling. Utilizing the well-established concept of sequential freeze-out, the scaling at low momenta extends to bulk hadrons (pi, K, p) at thermal freeze-out, albeit with different source parameters compared to chemical freeze-out. Elliptic-flow scaling is thus compatible with both equilibrium hydrodynamics and quark recombination.
C1 [He, Min; Fries, Rainer J.; Rapp, Ralf] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA.
[He, Min; Fries, Rainer J.; Rapp, Ralf] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA.
[Fries, Rainer J.] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA.
RP He, M (reprint author), Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA.
FU US National Science Foundation (NSF) [PHY-0449489, PHY-0847538,
PHY-0969394]; A.-v.-Humboldt Foundation; RIKEN/BNL Research Center; DOE
[DE-AC02-98CH10886]
FX We gratefully acknowledge helpful discussions with H. van Hees, X. Zhao,
and F. Riek. This work was supported by US National Science Foundation
(NSF) Grants PHY-0449489, PHY-0847538, and PHY-0969394, by the
A.-v.-Humboldt Foundation, by the RIKEN/BNL Research Center, and by DOE
Grant DE-AC02-98CH10886.
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SN 0556-2813
J9 PHYS REV C
JI Phys. Rev. C
PD SEP 21
PY 2010
VL 82
IS 3
AR 034907
DI 10.1103/PhysRevC.82.034907
PG 9
WC Physics, Nuclear
SC Physics
GA 652NB
UT WOS:000282012600003
ER
PT J
AU Adamson, P
Andreopoulos, C
Auty, DJ
Ayres, DS
Backhouse, C
Barr, G
Bernstein, RH
Betancourt, M
Bhattarai, P
Bishai, M
Blake, A
Bock, GJ
Boehm, J
Boehnlein, DJ
Bogert, D
Bower, C
Budd, S
Cavanaugh, S
Cherdack, D
Childress, S
Choudhary, BC
Cobb, JH
Coelho, JAB
Coleman, SJ
Corwin, L
Cronin-Hennessy, D
Danko, IZ
de Jong, JK
Devenish, NE
Diwan, MV
Dorman, M
Escobar, CO
Evans, JJ
Falk, E
Feldman, GJ
Frohne, MV
Gallagher, HR
Godley, A
Goodman, MC
Gouffon, P
Graf, N
Gran, R
Grashorn, EW
Grzelak, K
Habig, A
Harris, D
Harris, PG
Hartnell, J
Hatcher, R
Heller, K
Himmel, A
Holin, A
Huang, X
Hylen, J
Ilic, J
Irwin, GM
Isvan, Z
Jaffe, DE
James, C
Jensen, D
Kafka, T
Kasahara, SMS
Koizumi, G
Kopp, S
Kordosky, M
Krahn, Z
Kreymer, A
Lang, K
Lefeuvre, G
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
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
Ochoa-Ricoux, JP
Oliver, WP
Orchanian, M
Ospanov, R
Paley, J
Para, A
Patterson, RB
Pawloski, G
Pearce, GF
Petyt, DA
Pittam, R
Plunkett, RK
Rameika, RA
Raufer, TM
Rebel, B
Rodrigues, PA
Rosenfeld, C
Rubin, HA
Ryabov, VA
Sanchez, MC
Schneps, J
Schreiner, P
Shanahan, P
Smart, W
Smith, C
Sousa, A
Strait, M
Swain, S
Tagg, N
Talaga, RL
Thomas, J
Thomson, MA
Tinti, G
Toner, R
Tzanakos, G
Urheim, J
Vahle, P
Viren, B
Weber, A
Webb, RC
White, C
Whitehead, L
Wojcicki, SG
Wright, DM
Yang, T
Zhang, K
Zois, M
Zwaska, R
AF Adamson, P.
Andreopoulos, C.
Auty, D. J.
Ayres, D. S.
Backhouse, C.
Barr, G.
Bernstein, R. H.
Betancourt, M.
Bhattarai, P.
Bishai, M.
Blake, A.
Bock, G. J.
Boehm, J.
Boehnlein, D. J.
Bogert, D.
Bower, C.
Budd, S.
Cavanaugh, S.
Cherdack, D.
Childress, S.
Choudhary, B. C.
Cobb, J. H.
Coelho, J. A. B.
Coleman, S. J.
Corwin, L.
Cronin-Hennessy, D.
Danko, I. Z.
de Jong, J. K.
Devenish, N. E.
Diwan, M. V.
Dorman, M.
Escobar, C. O.
Evans, J. J.
Falk, E.
Feldman, G. J.
Frohne, M. V.
Gallagher, H. R.
Godley, A.
Goodman, M. C.
Gouffon, P.
Graf, N.
Gran, R.
Grashorn, E. W.
Grzelak, K.
Habig, A.
Harris, D.
Harris, P. G.
Hartnell, J.
Hatcher, R.
Heller, K.
Himmel, A.
Holin, A.
Huang, X.
Hylen, J.
Ilic, J.
Irwin, G. M.
Isvan, Z.
Jaffe, D. E.
James, C.
Jensen, D.
Kafka, T.
Kasahara, S. M. S.
Koizumi, G.
Kopp, S.
Kordosky, M.
Krahn, Z.
Kreymer, A.
Lang, K.
Lefeuvre, G.
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.
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.
Ochoa-Ricoux, J. P.
Oliver, W. P.
Orchanian, M.
Ospanov, R.
Paley, J.
Para, A.
Patterson, R. B.
Pawloski, G.
Pearce, G. F.
Petyt, D. A.
Pittam, R.
Plunkett, R. K.
Rameika, R. A.
Raufer, T. M.
Rebel, B.
Rodrigues, P. A.
Rosenfeld, C.
Rubin, H. A.
Ryabov, V. A.
Sanchez, M. C.
Schneps, J.
Schreiner, P.
Shanahan, P.
Smart, W.
Smith, C.
Sousa, A.
Strait, M.
Swain, S.
Tagg, N.
Talaga, R. L.
Thomas, J.
Thomson, M. A.
Tinti, G.
Toner, R.
Tzanakos, G.
Urheim, J.
Vahle, P.
Viren, B.
Weber, A.
Webb, R. C.
White, C.
Whitehead, L.
Wojcicki, S. G.
Wright, D. M.
Yang, T.
Zhang, K.
Zois, M.
Zwaska, R.
CA MINOS Collaboration
TI New constraints on muon-neutrino to electron-neutrino transitions in
MINOS
SO PHYSICAL REVIEW D
LA English
DT Article
ID GLOBAL ANALYSIS; LEPTON CHARGE; OSCILLATIONS; DETECTOR
AB This paper reports results from a search for nu(mu) -> nu(e) transitions by the MINOS experiment based on a 7 x 10(20) protons-on-target exposure. Our observation of 54 candidate nu(e) events in the far detector with a background of 49.1 +/- 7.0(stat) +/- 2.7(syst) events predicted by the measurements in the near detector requires 2sin(2)(2 theta(13))sin(2)theta(23) < 0.12(0.20) at the 90% C.L. for the normal (inverted) mass hierarchy at delta(CP) = 0. The experiment sets the tightest limits to date on the value of theta(13) for nearly all values of delta(CP) for the normal neutrino mass hierarchy and maximal sin(2)(2 theta(23)).
C1 [Adamson, P.; Bernstein, R. H.; 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.; Para, A.; Plunkett, R. K.; Rameika, R. A.; Rebel, B.; Shanahan, P.; Smart, W.; Zwaska, R.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Ayres, D. S.; Budd, S.; Goodman, M. C.; Huang, X.; McGowan, A. M.; Paley, J.; Talaga, R. L.] Argonne Natl Lab, Argonne, IL 60439 USA.
[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.
[Himmel, A.; Michael, D. G.; Mualem, L.; Newman, H. B.; Ochoa-Ricoux, J. P.; Orchanian, M.; Patterson, R. B.] CALTECH, Lauritsen Lab, Pasadena, CA 91125 USA.
[Blake, A.; 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, IFGW UNICAMP, BR-13083970 Campinas, SP, Brazil.
[Boehm, J.; Cavanaugh, S.; Feldman, G. J.; 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.; Graf, N.; Rubin, H. A.; White, C.] IIT, Div Phys, Chicago, IL 60616 USA.
[Bower, C.; Corwin, L.; Mayer, N.; Messier, M. D.; Mufson, S.; Musser, J.; Paley, J.; Urheim, J.] Indiana Univ, Bloomington, IN 47405 USA.
[Sanchez, M. C.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Ryabov, V. A.] PN Lebedev Phys Inst, Dept Nucl Phys, Moscow 119991, Russia.
[Wright, D. M.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
[Dorman, M.; Evans, J. J.; Holin, A.; Nichol, R. J.; Smith, C.; Thomas, J.] UCL, Dept Phys & Astron, London WC1E 6BT, England.
[Betancourt, M.; 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.
[Bhattarai, P.; Gran, R.; Habig, A.] Univ Minnesota, Dept Phys, Duluth, MN 55812 USA.
[Sanchez, M. C.; Tagg, N.] Otterbein Coll, Westerville, OH 43081 USA.
[Backhouse, C.; Barr, G.; Cobb, J. H.; de Jong, J. K.; Litchfield, R. P.; Pittam, R.; Rodrigues, P. A.; Sousa, A.; Tinti, G.; Weber, A.] Univ Oxford, Subdept Particle Phys, Oxford OX1 3RH, England.
[Danko, I. Z.; Isvan, Z.; Naples, D.] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA.
[Andreopoulos, C.; Hartnell, J.; Ilic, J.; 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.; Ling, J.; Mishra, S. R.; Rosenfeld, C.] Univ S Carolina, Dept Phys & Astron, Columbia, SC 29208 USA.
[Irwin, G. M.; Pawloski, G.; Swain, S.; 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.; Lefeuvre, G.] Univ Sussex, Dept Phys & Astron, Brighton BN1 9QH, E Sussex, England.
[Webb, R. C.] Texas A&M Univ, Dept Phys, College Stn, TX 77843 USA.
[Kopp, S.; Lang, K.; Loiacono, L.; Ma, J.; Mehdiyev, R.; Ospanov, R.] 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.
Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA.
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; Evans, Justin/P-4981-2014; Gouffon,
Philippe/I-4549-2012; Ling, Jiajie/I-9173-2014; Inst. of Physics, Gleb
Wataghin/A-9780-2017;
OI Bernstein, Robert/0000-0002-7610-950X; Cherdack,
Daniel/0000-0002-3829-728X; Weber, Alfons/0000-0002-8222-6681; Hartnell,
Jeffrey/0000-0002-1744-7955; Harris, Philip/0000-0003-4369-3874; Evans,
Justin/0000-0003-4697-3337; Gouffon, Philippe/0000-0001-7511-4115; Ling,
Jiajie/0000-0003-2982-0670; COLEMAN, STEPHEN/0000-0002-4621-9169;
Corwin, Luke/0000-0001-7143-3821
FU U.S. DOE; U.K. STFC; U.S. NSF; State and University of Minnesota;
University of Athens, Greece; Brazil's FAPESP; CNPq; CAPES
FX This work was supported by the U.S. DOE; the U.K. STFC; the U.S. NSF;
the state and University of Minnesota; the University of Athens, Greece;
and Brazil's FAPESP, CNPq, and CAPES. We are grateful to the Minnesota
DNR, the crew of the Soudan Underground Laboratory, and the staff of
Fermilab for their contributions to this effort.
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J9 PHYS REV D
JI Phys. Rev. D
PD SEP 21
PY 2010
VL 82
IS 5
AR 051102
DI 10.1103/PhysRevD.82.051102
PG 6
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 652XP
UT WOS:000282046100001
ER
PT J
AU Horava, P
Melby-Thompson, CM
AF Horava, Petr
Melby-Thompson, Charles M.
TI General covariance in quantum gravity at a Lifshitz point
SO PHYSICAL REVIEW D
LA English
DT Article
ID FIELD; DYNAMICS
AB In the minimal formulation of gravity with Lifshitz-type anisotropic scaling, the gauge symmetries of the system are foliation-preserving diffeomorphisms of spacetime. Consequently, compared to general relativity, the spectrum contains an extra scalar graviton polarization. Here we investigate the possibility of extending the gauge group by a local U(1) symmetry to "nonrelativistic general covariance." This extended gauge symmetry eliminates the scalar graviton, and forces the coupling constant lambda in the kinetic term of the minimal formulation to take its relativistic value, lambda = 1. The resulting theory exhibits anisotropic scaling at short distances, and reproduces many features of general relativity at long distances.
C1 [Horava, Petr; Melby-Thompson, Charles M.] Univ Calif Berkeley, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA.
[Horava, Petr; Melby-Thompson, Charles M.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Horava, Petr; Melby-Thompson, Charles M.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Berkeley, CA 94720 USA.
[Horava, Petr] Univ Tokyo, Inst Phys & Math Universe, Kashiwa, Chiba 2778568, Japan.
RP Horava, P (reprint author), Univ Calif Berkeley, Berkeley Ctr Theoret Phys, Berkeley, CA 94720 USA.
FU NSF [PHY-0855653]; DOE [DE-AC02-05CH11231]; Berkeley Center for
Theoretical Physics
FX We wish to express our thanks to N. Afshordi, J. Ambjorn, D. Benedetti,
D. Blas, R. Brandenberger, G. Dvali, M. Henneaux, E. Kiritsis, R. Loll,
A. Maloney, S. Mukohyama, Y. Nakayama, O. Pujolas, S. Sibiryakov, A.
Vainshtein, and the participants of the Perimeter Institute workshop on
Gravity at a Lifshitz Point (November 2009) for useful discussions. P.H.
is grateful to the Arnold Sommerfeld Center for Theoretical Physics,
Ludwig-Maximilians-Universitat, Munchen, and the PH-TH Division, CERN,
Geneve, for their hospitality during some of the final stages of this
work. The results of this work were presented at the GR 19 Conference in
Mexico City in July 2010; P.H. wishes to thank the organizers for their
invitation and hospitality. This work has been supported by NSF Grant
No. PHY-0855653, DOE Grant No. DE-AC02-05CH11231, and by the Berkeley
Center for Theoretical Physics.
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SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD SEP 21
PY 2010
VL 82
IS 6
AR 064027
DI 10.1103/PhysRevD.82.064027
PG 21
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 652YG
UT WOS:000282047900006
ER
PT J
AU Lund, T
Marek, A
Lunardini, C
Janka, HT
Raffelt, G
AF Lund, Tina
Marek, Andreas
Lunardini, Cecilia
Janka, Hans-Thomas
Raffelt, Georg
TI Fast time variations of supernova neutrino fluxes and their
detectability
SO PHYSICAL REVIEW D
LA English
DT Article
ID ACCRETION-SHOCK INSTABILITY; CORE-COLLAPSE SUPERNOVAE;
ADVECTIVE-ACOUSTIC CYCLE; DRIVEN SUPERNOVA; SIMULATIONS; EXPLOSIONS;
HYDRODYNAMICS; MECHANISM; TRANSPORT; FEATURES
AB In the delayed explosion scenario of core-collapse supernovae, the accretion phase shows pronounced convective overturns and a low-multipole hydrodynamic instability, the standing accretion shock instability. These effects imprint detectable fast time variations on the emerging neutrino flux. Among existing detectors, IceCube is best suited to this task, providing an event rate of similar to 1000 ms(-1) during the accretion phase for a fiducial SN distance of 10 kpc, comparable to what could be achieved with a megaton water Cherenkov detector. If the standing accretion shock instability activity lasts for several hundred ms, a Fourier component with an amplitude of 1% of the average signal clearly sticks out from the shot noise. We analyze in detail the output of axially symmetric hydrodynamical simulations that predict much larger amplitudes up to frequencies of a few hundred Hz. If these models are roughly representative for realistic SNe, fast time variations of the neutrino signal are easily detectable in IceCube or future megaton-class instruments. We also discuss the information that could be deduced from such a measurement about the physics in the SN core and the explosion mechanism of the SN.
C1 [Lund, Tina] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark.
[Marek, Andreas; Janka, Hans-Thomas] Max Planck Inst Astrophys, D-85748 Garching, Germany.
[Lunardini, Cecilia] Arizona State Univ, Tempe, AZ 85287 USA.
[Lunardini, Cecilia] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA.
[Raffelt, Georg] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany.
RP Lund, T (reprint author), Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark.
FU DFG (Germany) [TR-27]; NSF [PHY-0854827]
FX We acknowledge partial support by the DFG (Germany) under Grant No.
TR-27 "Neutrinos and Beyond," the Cluster of Excellence "Origin and
Structure of the Universe," and the NSF under Grant No. PHY-0854827. We
acknowledge computer time grants at the John von Neumann Institute for
Computing (NIC) in Julich, the Hochstleistungsrechenzentrum of the
Stuttgart University (HLRS) under Grant No. SuperN/12758, the
Leibniz-Rechenzentrum Munchen, and the RZG in Garching. T.L. thanks the
MPI Physics for hospitality while this work was begun. We thank the
participants of the workshop JIGSAW 2010 (22-26 February 2010, Mumbai,
India) for comments and discussions, in particular, Timo Griesel and
Thomas Kowarik.
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SN 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD SEP 21
PY 2010
VL 82
IS 6
AR 063007
DI 10.1103/PhysRevD.82.063007
PG 13
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 652YG
UT WOS:000282047900002
ER
PT J
AU Kamionka, T
Martens, M
Chou, KW
Curcic, M
Drews, A
Schutz, G
Tyliszczak, T
Stoll, H
Van Waeyenberge, B
Meier, G
AF Kamionka, Thomas
Martens, Michael
Chou, Kang Wei
Curcic, Michael
Drews, Andre
Schuetz, Gisela
Tyliszczak, Tolek
Stoll, Hermann
Van Waeyenberge, Bartel
Meier, Guido
TI Magnetic Antivortex-Core Reversal by Circular-Rotational Spin Currents
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID EXCITATION; PERMALLOY
AB Topological singularities occur as antivortices in ferromagnetic thin-film microstructures. Antivortices behave as two-dimensional oscillators with a gyrotropic eigenmode which can be excited resonantly by spin currents and magnetic fields. We show that the two excitation types couple in an opposing sense of rotation in the case of resonant antivortex excitation with circular-rotational currents. If the sense of rotation of the current coincides with the intrinsic sense of gyration of the antivortex, the coupling to the Oersted fields is suppressed and only the spin-torque contribution locks into the gyrotropic eigenmode. We report on the experimental observation of purely spin-torque induced antivortex-core reversal. The dynamic response of an isolated antivortex is imaged by time-resolved scanning transmission x-ray microscopy on its genuine time and length scale.
C1 [Kamionka, Thomas; Martens, Michael; Meier, Guido] Univ Hamburg, Inst Angew Phys, D-20355 Hamburg, Germany.
[Kamionka, Thomas; Martens, Michael; Meier, Guido] Univ Hamburg, Zentrum Mikrostrukturforsch, D-20355 Hamburg, Germany.
[Chou, Kang Wei; Tyliszczak, Tolek] LBNL, Adv Light Source, Berkeley, CA 94720 USA.
[Curcic, Michael; Schuetz, Gisela; Stoll, Hermann] Max Planck Inst Met Res, D-70569 Stuttgart, Germany.
[Drews, Andre] Univ Hamburg, Arbeitsbereich Tech Informat Syst, D-22527 Hamburg, Germany.
[Van Waeyenberge, Bartel] Univ Ghent, Dept Solid State Sci, B-9000 Ghent, Belgium.
RP Kamionka, T (reprint author), Univ Hamburg, Inst Angew Phys, D-20355 Hamburg, Germany.
EM tkamionk@physnet.uni-hamburg.de
FU Deutsche Forschungsgemeinschaft [Sonder-forschungsbereich 668]; City of
Hamburg via the Landesexzellenzcluster Nano-Spintronics; Office of
Science, Office of Basic Energy Sciences of the U.S. Department of
Energy
FX We would like to thank Rene Eiselt for sharing his experience on sample
preparation on Si3N4 membranes and Ulrich Merkt
for continuous support. Financial support by the Deutsche
Forschungsgemeinschaft via the Sonder-forschungsbereich 668 and the city
of Hamburg via the Landesexzellenzcluster Nano-Spintronics is gratefully
acknowledged. The Advanced Light Source is supported by the Director,
Office of Science, Office of Basic Energy Sciences of the U.S.
Department of Energy.
NR 26
TC 34
Z9 34
U1 0
U2 21
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
EI 1079-7114
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD SEP 21
PY 2010
VL 105
IS 13
AR 137204
DI 10.1103/PhysRevLett.105.137204
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653AM
UT WOS:000282054300008
PM 21230805
ER
PT J
AU McCarren, J
Becker, JW
Repeta, DJ
Shi, YM
Young, CR
Malmstrom, RR
Chisholm, SW
DeLong, EF
AF McCarren, Jay
Becker, Jamie W.
Repeta, Daniel J.
Shi, Yanmei
Young, Curtis R.
Malmstrom, Rex R.
Chisholm, Sallie W.
DeLong, Edward F.
TI Microbial community transcriptomes reveal microbes and metabolic
pathways associated with dissolved organic matter turnover in the sea
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Article
DE carbon cycle; marine; bacteria; metagenomics; metatranscriptomics
ID NORTHWESTERN SARGASSO SEA; CONVECTIVE OVERTURN; METHYL SUGARS; SEQUENCE
DATA; WATER-COLUMN; R-PACKAGE; MARINE; CARBON; ENVIRONMENT; DIVERSITY
AB Marine dissolved organic matter (DOM) contains as much carbon as the Earth's atmosphere, and represents a critical component of the global carbon cycle. To better define microbial processes and activities associated with marine DOM cycling, we analyzed genomic and transcriptional responses of microbial communities to high-molecular-weight DOM (HMWDOM) addition. The cell density in the unamended control remained constant, with very few transcript categories exhibiting significant differences over time. In contrast, the DOM-amended microcosm doubled in cell numbers over 27 h, and a variety of HMWDOM-stimulated transcripts from different taxa were observed at all time points measured relative to the control. Transcripts significantly enriched in the HMWDOM treatment included those associated with two-component sensor systems, phosphate and nitrogen assimilation, chemotaxis, and motility. Transcripts from Idiomarina and Alteromonas spp., the most highly represented taxa at the early time points, included those encoding TonB-associated transporters, nitrogen assimilation genes, fatty acid catabolism genes, and TCA cycle enzymes. At the final time point, Methylophaga rRNA and non-rRNA transcripts dominated the HMWDOM-amended microcosm, and included gene transcripts associated with both assimilatory and dissimilatory single-carbon compound utilization. The data indicated specific resource partitioning of DOM by different bacterial species, which results in a temporal succession of taxa, metabolic pathways, and chemical transformations associated with HMWDOM turnover. These findings suggest that coordinated, cooperative activities of a variety of bacterial "specialists" may be critical in the cycling of marine DOM, emphasizing the importance of microbial community dynamics in the global carbon cycle.
C1 [McCarren, Jay; Becker, Jamie W.; Shi, Yanmei; Young, Curtis R.; Malmstrom, Rex R.; Chisholm, Sallie W.; DeLong, Edward F.] MIT, Dept Civil & Environm Engn, Cambridge, MA 02139 USA.
[DeLong, Edward F.] MIT, Dept Biol Engn, Cambridge, MA 02139 USA.
[Becker, Jamie W.; Repeta, Daniel J.] Woods Hole Oceanog Inst, Dept Marine Chem & Geochem, Woods Hole, MA 02543 USA.
[McCarren, Jay] Synthet Genom, La Jolla, CA 92037 USA.
[Malmstrom, Rex R.] Joint Genome Inst, Walnut Creek, CA 94598 USA.
RP DeLong, EF (reprint author), MIT, Dept Civil & Environm Engn, 77 Massachusetts Ave, Cambridge, MA 02139 USA.
EM delong@mit.edu
RI Malmstrom, Rex/K-7339-2012;
OI Becker, Jamie/0000-0003-4564-3192; Becker, Jamie/0000-0001-5308-1818
FU Gordon and Betty Moore Foundation; Office of Science-Biological and
Environmental Research, US Department of Energy; National Science
Foundation; National Science Foundation Science and Technology Center
[EF0424599]
FX We thank the captain and crew of the R/V Kilo Moana for facilitating
sample collection, Chief Scientist Ricardo Letelier and all participants
of the C-MORE BLOOMER cruise for help and encouragement, and Rachel
Barry for pyrosequence library production and sequencing. This work was
supported by the Gordon and Betty Moore Foundation (E.F.D., S.W.C., and
D.J.R.), the Office of Science-Biological and Environmental Research, US
Department of Energy (E.F.D and S.W.C), the National Science Foundation
(D.J.R.), and National Science Foundation Science and Technology Center
Award EF0424599 (to E.F.D. and S.W.C.). This article is a contribution
from the National Science Foundation Science and Technology Center for
Microbial Oceanography: Research and Education (C-MORE).
NR 53
TC 154
Z9 156
U1 18
U2 129
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 SEP 21
PY 2010
VL 107
IS 38
BP 16420
EP 16427
DI 10.1073/pnas.1010732107
PG 8
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 652JW
UT WOS:000282003700010
PM 20807744
ER
PT J
AU Chung, S
Shin, SH
Bertozzi, CR
De Yoreo, JJ
AF Chung, Sungwook
Shin, Seong-Ho
Bertozzi, Carolyn R.
De Yoreo, James J.
TI Self-catalyzed growth of S layers via an amorphous-to-crystalline
transition limited by folding kinetics
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Article
DE in situ atomic force microscopy imaging; protein crystal growth;
two-step crystallization; amorphous precursors; assembly kinetics
ID ATOMIC-FORCE-MICROSCOPY; BACILLUS-SPHAERICUS; PROTEIN; PHASE;
RECRYSTALLIZATION; NUCLEATION; BILAYERS; ARRAYS; SBPA
AB The importance of nonclassical, multistage crystallization pathways is increasingly evident from theoretical studies on colloidal systems and experimental investigations of proteins and biomineral phases. Although theoretical predictions suggest that proteins follow these pathways as a result of fluctuations that create unstable dense-liquid states, microscopic studies indicate these states are long-lived. Using in situ atomic force microscopy to follow 2D assembly of S-layer proteins on supported lipid bilayers, we have obtained a molecular-scale picture of multistage protein crystallization that reveals the importance of conformational transformations in directing the pathway of assembly. We find that monomers with an extended conformation first form a mobile adsorbed phase, from which they condense into amorphous clusters. These clusters undergo a phase transition through S-layer folding into crystalline clusters composed of compact tetramers. Growth then proceeds by formation of new tetramers exclusively at cluster edges, implying tetramer formation is autocatalytic. Analysis of the growth kinetics leads to a quantitative model in which tetramer creation is rate limiting. However, the estimated barrier is much smaller than expected for folding of isolated S-layer proteins, suggesting an energetic rationale for this multistage pathway.
C1 [Chung, Sungwook; Shin, Seong-Ho; Bertozzi, Carolyn R.; De Yoreo, James J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Mol Foundry, Berkeley, CA 94720 USA.
[Chung, Sungwook] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
[Shin, Seong-Ho; Bertozzi, Carolyn R.; De Yoreo, James J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
[Shin, Seong-Ho; Bertozzi, Carolyn R.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
RP Bertozzi, CR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Mol Foundry, Berkeley, CA 94720 USA.
EM crbertozzi@lbl.gov; jjdeyoreo@lbl.gov
RI Chung, Sungwook/H-6248-2012
FU U.S. Department of Energy [DE-AC02-05CH11231]
FX We gratefully acknowledge the assistance of Babak Sanii in fabricating
supported lipid bilayers and Julie Norville for providing advice on
protein purification. This work was performed at the Molecular Foundry,
Lawrence Berkeley National Laboratory, with support from the Office of
Science, Office of Basic Energy Sciences, of the U.S. Department of
Energy under Contract DE-AC02-05CH11231.
NR 33
TC 62
Z9 62
U1 2
U2 41
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 SEP 21
PY 2010
VL 107
IS 38
BP 16536
EP 16541
DI 10.1073/pnas.1008280107
PG 6
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 652JW
UT WOS:000282003700030
PM 20823255
ER
PT J
AU Goldstein, RZ
Woicik, PA
Maloney, T
Tomasi, D
Alia-Klein, N
Shan, JT
Honorio, J
Samaras, D
Wang, RL
Telang, F
Wang, GJ
Volkow, ND
AF Goldstein, Rita Z.
Woicik, Patricia A.
Maloney, Thomas
Tomasi, Dardo
Alia-Klein, Nelly
Shan, Juntian
Honorio, Jean
Samaras, Dimitris
Wang, Ruiliang
Telang, Frank
Wang, Gene-Jack
Volkow, Nora D.
TI Oral methylphenidate normalizes cingulate activity in cocaine addiction
during a salient cognitive task
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Article
DE prefrontal cortex; behavioral intervention; dopamine agonist; functional
MRI blood oxygen level-dependent; emotional Stroop
ID MEDIAL PREFRONTAL CORTEX; ATTENTION-DEFICIT/HYPERACTIVITY DISORDER;
POSTTRAUMATIC-STRESS-DISORDER; ANTERIOR CINGULATE; ORBITOFRONTAL CORTEX;
EMOTIONAL CONFLICT; BRAIN ACTIVATION; FRONTAL-CORTEX; DOPAMINE; ABUSE
AB Anterior cingulate cortex (ACC) hypoactivations during cognitive demand are a hallmark deficit in drug addiction. Methylphenidate (MPH) normalizes cortical function, enhancing task salience and improving associated cognitive abilities, in other frontal lobe pathologies; however, in clinical trials, MPH did not improve treatment outcome in cocaine addiction. We hypothesized that oral MPH will attenuate ACC hypoactivations and improve associated performance during a salient cognitive task in individuals with cocaine-use disorders (CUD). In the current functional MRI study, we used a rewarded drug cue-reactivity task previously shown to be associated with hypoactivations in both major ACC subdivisions (implicated in default brain function) in CUD compared with healthy controls. The task was performed by 13 CUD and 14 matched healthy controls on 2 d: after ingesting a single dose of oral MPH (20 mg) or placebo (lactose) in a counterbalanced fashion. Results show that oral MPH increased responses to this salient cognitive task in both major ACC subdivisions (including the caudal-dorsal ACC and rostroventromedial ACC extending to the medial orbitofrontal cortex) in the CUD. These functional MRI results were associated with reduced errors of commission (a common impulsivity measure) and improved task accuracy, especially during the drug (vs. neutral) cue-reactivity condition in all subjects. The clinical application of such MPH-induced brain-behavior enhancements remains to be tested.
C1 [Goldstein, Rita Z.; Woicik, Patricia A.; Maloney, Thomas; Alia-Klein, Nelly; Wang, Ruiliang; Wang, Gene-Jack] Brookhaven Natl Lab, Dept Med Res, Ctr Translat Neuroimaging, Upton, NY 11973 USA.
[Tomasi, Dardo; Telang, Frank; Volkow, Nora D.] NIAAA, Intramural Program, Rockville, MD 20857 USA.
[Shan, Juntian; Honorio, Jean; Samaras, Dimitris] SUNY Stony Brook, Dept Comp Sci, Stony Brook, NY 11794 USA.
[Volkow, Nora D.] Natl Inst Drug Abuse, Bethesda, MD 20892 USA.
RP Goldstein, RZ (reprint author), Brookhaven Natl Lab, Dept Med Res, Ctr Translat Neuroimaging, Upton, NY 11973 USA.
EM rgoldstein@bnl.gov
RI Tomasi, Dardo/J-2127-2015
FU National Institute on Drug Abuse [R01DA023579, R21DA02062, R01DA020949];
General Clinical Research Center [5-MO1-RR-10710]
FX This study was supported by National Institute on Drug Abuse Grants
R01DA023579 (to R.Z.G.), R21DA02062 (to R.Z.G.), and R01DA020949 (to
D.S.), General Clinical Research Center Grant 5-MO1-RR-10710, and the
Office of Biological and Environmental Research, Department of Energy
(for infrastructure support).
NR 59
TC 63
Z9 64
U1 2
U2 5
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 SEP 21
PY 2010
VL 107
IS 38
BP 16667
EP 16672
DI 10.1073/pnas.1011455107
PG 6
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 652JW
UT WOS:000282003700052
PM 20823246
ER
PT J
AU Van Neste, CW
Morales-Rodriguez, ME
Senesac, LR
Mahajan, SM
Thundat, T
AF Van Neste, Charles W.
Morales-Rodriguez, Marissa E.
Senesac, Larry R.
Mahajan, Satish M.
Thundat, Thomas
TI Quartz crystal tuning fork photoacoustic point sensing
SO SENSORS AND ACTUATORS B-CHEMICAL
LA English
DT Article
DE Quartz crystal tuning fork; Photoacoustic; Spectroscopy; Quantum cascade
laser; Point; Sensing
ID QUANTUM CASCADE LASERS; SPECTROSCOPY; SENSOR
AB Achieving chemical specificity in trace detection of small molecules is a challenge. Here we describe a highly selective method for detection of trace chemicals using photoacoustic spectroscopy of adsorbed molecules on a quartz crystal tuning fork The technique is demonstrated in an open environment without the need of a resonant cavity Mid-infrared quantum cascade lasers are used as the light source with cyclotrimethylenetrinitromine (RDX) residue being the target analyte The results show absorption peaks matching those of eat her literature (C) 2010 Elseviet B.V. All rights reserved
C1 [Van Neste, Charles W.; Morales-Rodriguez, Marissa E.; Senesac, Larry R.; Thundat, Thomas] Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN 37831 USA.
[Senesac, Larry R.; Thundat, Thomas] Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA.
[Van Neste, Charles W.; Mahajan, Satish M.] Tennessee Technol Univ, Dept Elect Engn, Cookeville, TN 38505 USA.
RP Van Neste, CW (reprint author), Oak Ridge Natl Lab, Biosci Div, POB 2008, Oak Ridge, TN 37831 USA.
FU Office of Naval Research; U.S. Dept. of Energy [DE-AC05-00OR22725]
FX This work was supported in part by the Office of Naval Research C-IED
program and the DOE NA-22 program. Oak Ridge National Laboratory is
managed by UT-Battelle, LLC, for the U.S. Dept. of Energy under contract
DE-AC05-00OR22725.
NR 18
TC 9
Z9 9
U1 1
U2 10
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0925-4005
J9 SENSOR ACTUAT B-CHEM
JI Sens. Actuator B-Chem.
PD SEP 21
PY 2010
VL 150
IS 1
BP 402
EP 405
DI 10.1016/j.snb.2010.06.045
PG 4
WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation
SC Chemistry; Electrochemistry; Instruments & Instrumentation
GA 661KC
UT WOS:000282726200057
ER
PT J
AU Chow, WW
Crawford, MH
Tsao, JY
Kneissl, M
AF Chow, W. W.
Crawford, M. H.
Tsao, J. Y.
Kneissl, M.
TI Internal efficiency of InGaN light-emitting diodes: Beyond a
quasiequilibrium model
SO APPLIED PHYSICS LETTERS
LA English
DT Article
AB We propose a model to better investigate InGaN light-emitting diode (LED) internal efficiency by extending beyond the usual total carrier density rate equation approach. To illustrate its capability, the model is applied to study intrinsic performance differences between violet and green LEDs. The simulations show performance differences, at different current densities and temperatures, arising from variations in spontaneous emission and heat loss rates. By tracking the momentum-resolved carrier populations, these rate changes are, in turn, traced to differences in bandstructure and plasma heating. The latter leads to carrier distributions that deviate from the quasiequilibrium ones at lattice temperature. (C) 2010 American Institute of Physics. [doi:10.1063/1.3490232]
C1 [Chow, W. W.; Crawford, M. H.; Tsao, J. Y.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Kneissl, M.] Tech Univ Berlin, Inst Solid State Phys, D-10623 Berlin, Germany.
RP Chow, WW (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM wwchow@sandia.gov
RI Kneissl, Michael/B-9682-2012
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences; Deutsche Forschungsgemeinschaft [787]
FX We thank K. Lyo and J. Wierer for helpful discussions. Sandia authors'
contributions are supported by the Solid-State Lighting Science Center,
an Energy Frontier Research Center (EFRC) funded by the U.S. Department
of Energy, Office of Science, Office of Basic Energy Sciences. M.K.
support provided by the Sonderforschungbereich (SFB) 787 funded by the
Deutsche Forschungsgemeinschaft.
NR 11
TC 24
Z9 24
U1 1
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 SEP 20
PY 2010
VL 97
IS 12
AR 121105
DI 10.1063/1.3490232
PG 3
WC Physics, Applied
SC Physics
GA 653VC
UT WOS:000282124700005
ER
PT J
AU Droubay, TC
Qiao, L
Kaspar, TC
Engelhard, MH
Shutthanandan, V
Chambers, SA
AF Droubay, T. C.
Qiao, L.
Kaspar, T. C.
Engelhard, M. H.
Shutthanandan, V.
Chambers, S. A.
TI Nonstoichiometric material transfer in the pulsed laser deposition of
LaAlO3
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE lanthanum compounds; pulsed laser deposition; Rutherford backscattering;
stoichiometry; X-ray photoelectron spectra
ID ACCELERATED EXPANSION; ANGULAR-DISTRIBUTION; ABLATED MATERIALS;
SOLID-SURFACE; FILM GROWTH; THIN-FILMS; DIAGNOSTICS; GASES
AB Inequivalent angular distributions have been found for La and Al in the ablation plume from LaAlO3 single crystal targets using a KrF laser during pulsed laser deposition. Angular distributions and stoichiometries in the condensate were measured and reveal decidedly nonstoichiometric transfer from target to substrate over most of the angular range. Composition varied dramatically for plume angles parallel to the long axis of the laser spot with the on-axis position exhibiting a peak in the La/Al atom ratio at similar to 1.5. The distributions were more diffuse in the perpendicular direction. Stoichiometric LaAlO3 was found in the condensate only at an extreme off-axis position. (C) 2010 American Institute of Physics. [doi:10.1063/1.3487778]
C1 [Droubay, T. C.; Qiao, L.; Kaspar, T. C.; Engelhard, M. H.; Shutthanandan, V.; Chambers, S. A.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Droubay, TC (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA.
EM tim.droubay@pnl.gov
RI Qiao, Liang/A-8165-2012; Engelhard, Mark/F-1317-2010; Droubay,
Tim/D-5395-2016;
OI Droubay, Tim/0000-0002-8821-0322; Engelhard, Mark/0000-0002-5543-0812
FU U.S. Department of Energy, Office of Science, Division of Materials
Sciences and Engineering; Department of Energy's Office of Biological
and Environmental Research at Pacific Northwest National Laboratory
FX This work was supported by the U.S. Department of Energy, Office of
Science, Division of Materials Sciences and Engineering and was
performed using EMSL, a national scientific user facility sponsored by
the Department of Energy's Office of Biological and Environmental
Research and located at Pacific Northwest National Laboratory.
NR 22
TC 28
Z9 28
U1 4
U2 35
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 SEP 20
PY 2010
VL 97
IS 12
AR 124105
DI 10.1063/1.3487778
PG 3
WC Physics, Applied
SC Physics
GA 653VC
UT WOS:000282124700079
ER
PT J
AU Erat, S
Wadati, H
Aksoy, F
Liu, Z
Graule, T
Gauckler, LJ
Braun, A
AF Erat, Selma
Wadati, Hiroki
Aksoy, Funda
Liu, Zhi
Graule, Thomas
Gauckler, Ludwig J.
Braun, Artur
TI Iron-resonant valence band photoemission and oxygen near edge x-ray
absorption fine structure study on La1-xSrxFe0.75Ni0.25O3-delta
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE electrical conductivity; electronic density of states; hole density;
lanthanum compounds; photoelectron spectra; strontium compounds; valence
bands; X-ray absorption spectra
ID LA1-XSRXFEO3; CONDUCTIVITY; PEROVSKITES; BEHAVIOR; SPECTRA; FE; CO
AB Iron resonant valence band photoemission spectra (VB PES) of Sr substituted LaFe0.75Ni0.25O3-delta have been recorded across the Fe 2p-3d absorption threshold to obtain Fe specific spectral information on the 3d projected partial density of states. Comparison with La1-xSrxFeO3 resonant VB PES literature data suggests that substitution of Fe by Ni forms electron holes which have mainly O 2p character. Substitution of La by Sr increases the hole concentration to an extent that the e(g) structure vanishes. The variation in the e(g) and t(2g) structures is paralleled by the changes in the electrical conductivity. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3484960]
C1 [Erat, Selma; Graule, Thomas; Braun, Artur] Empa Swiss Fed Labs Mat Sci & Technol, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland.
[Erat, Selma; Gauckler, Ludwig J.] Swiss Fed Inst Technol, ETH Zurich, Dept Mat, CH-8037 Zurich, Switzerland.
[Wadati, Hiroki] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada.
[Aksoy, Funda] Cukurova Univ, Dept Phys, TR-01330 Adana, Turkey.
[Aksoy, Funda; Liu, Zhi] Ernest Orlando Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA.
[Graule, Thomas] Tech Univ Bergakad Freiberg, D-09596 Freiberg, Germany.
RP Erat, S (reprint author), Empa Swiss Fed Labs Mat Sci & Technol, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland.
EM selmaerat33@gmail.com; artur.braun@alumni.ethz.ch
RI Liu, Zhi/B-3642-2009; BRAUN, Artur/A-1154-2009; Gauckler,
Ludwig/C-2784-2009
OI Liu, Zhi/0000-0002-8973-6561; BRAUN, Artur/0000-0002-6992-7774;
Gauckler, Ludwig/0000-0003-4668-4025
FU E.U. MIRG [CT-2006-042095]; Swiss NSF [200021-116688]; Swiss Federal
Office of Energy [100411]; Office of Science/BES, of the U.S. DoE
[DE-AC02-05CH11231]
FX Funding by E.U. MIRG under Grant No. CT-2006-042095, Swiss NSF under
Grant No. 200021-116688, Swiss Federal Office of Energy under Project
No. 100411. The ALS is supported by the Director, Office of Science/BES,
of the U.S. DoE, Grant No. DE-AC02-05CH11231. The authors would like to
thank Dr. Wanli Yang and student Paul Olalde Valesco from ALS for their
help during XAS measurements.
NR 17
TC 5
Z9 5
U1 1
U2 15
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 SEP 20
PY 2010
VL 97
IS 12
AR 124101
DI 10.1063/1.3484960
PG 3
WC Physics, Applied
SC Physics
GA 653VC
UT WOS:000282124700075
ER
PT J
AU Zhou, H
Chisholm, MF
Pant, P
Chang, HJ
Gazquez, J
Pennycook, SJ
Narayan, J
AF Zhou, H.
Chisholm, M. F.
Pant, P.
Chang, H. J.
Gazquez, J.
Pennycook, S. J.
Narayan, J.
TI Atomic structure of misfit dislocations in nonpolar ZnO/Al2O3
heterostructures
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE aluminium compounds; atomic structure; dislocations; II-VI
semiconductors; optical properties; scanning electron microscopy;
semiconductor heterojunctions; transmission electron microscopy; wide
band gap semiconductors; zinc compounds
ID TRANSMISSION ELECTRON-MICROSCOPY; GRAIN-BOUNDARIES; ZNO FILMS; EPITAXY
AB Understanding dislocation core structures at the atomic level is of significant theoretical and technological importance because of the role dislocations play in the electronic/optical properties of materials. In this paper, we report our aberration-corrected scanning transmission electron microscopy study on misfit dislocation core structures at non-polar (11 (2) over bar0)ZnO/(1 (1) over bar 02)Al2O3 (a-ZnO/r-Al2O3) interface. The atomic configuration of the core structure is found to be closely related to the preferred interfacial bonding configuration. A significant number of these misfit dislocations have undergone a core structure modification involving the incorporation of Zn in the Al2O3 side of the dislocation. (C) 2010 American Institute of Physics. [doi:10.1063/1.3489687]
C1 [Zhou, H.; Pant, P.; Narayan, J.] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA.
[Zhou, H.; Chisholm, M. F.; Chang, H. J.; Gazquez, J.; Pennycook, S. J.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
RP Zhou, H (reprint author), N Carolina State Univ, Dept Mat Sci & Engn, Box 7907, Raleigh, NC 27695 USA.
EM hzhou4@ncsu.edu
FU National Science Foundation (NSF) [DMR-0803663]; DOE Office of Science,
Materials Sciences and Engineering Division
FX This research was supported by the National Science Foundation (NSF
DMR-0803663) and DOE Office of Science, Materials Sciences and
Engineering Division. H.Z. acknowledges Dr. J. He for useful
discussions. Schematic drawings presented in this paper were produced
using Vesta.23
NR 23
TC 11
Z9 11
U1 2
U2 38
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 SEP 20
PY 2010
VL 97
IS 12
AR 121914
DI 10.1063/1.3489687
PG 3
WC Physics, Applied
SC Physics
GA 653VC
UT WOS:000282124700026
ER
PT J
AU Brodwin, M
Ruel, J
Ade, PAR
Aird, KA
Andersson, K
Ashby, MLN
Bautz, M
Bazin, G
Benson, BA
Bleem, LE
Carlstrom, JE
Chang, CL
Crawford, TM
Crites, AT
De Haan, T
Desai, S
Dobbs, MA
Dudley, JP
Fazio, GG
Foley, RJ
Forman, WR
Garmire, G
George, EM
Gladders, MD
Gonzalez, AH
Halverson, NW
High, FW
Holder, GP
Holzapfel, WL
Hrubes, JD
Jones, C
Joy, M
Keisler, R
Knox, L
Lee, AT
Leitch, EM
Lueker, M
Marrone, DP
McMahon, JJ
Mehl, J
Meyer, SS
Mohr, JJ
Montroy, TE
Murray, SS
Padin, S
Plagge, T
Pryke, C
Reichardt, CL
Rest, A
Ruhl, JE
Schaffer, KK
Shaw, L
Shirokoff, E
Song, J
Spieler, HG
Stalder, B
Stanford, SA
Staniszewski, Z
Stark, AA
Stubbs, CW
Vanderlinde, K
Vieira, JD
Vikhlinin, A
Williamson, R
Yang, Y
Zahn, O
Zenteno, A
AF Brodwin, M.
Ruel, J.
Ade, P. A. R.
Aird, K. A.
Andersson, K.
Ashby, M. L. N.
Bautz, M.
Bazin, G.
Benson, B. A.
Bleem, L. E.
Carlstrom, J. E.
Chang, C. L.
Crawford, T. M.
Crites, A. T.
De Haan, T.
Desai, S.
Dobbs, M. A.
Dudley, J. P.
Fazio, G. G.
Foley, R. J.
Forman, W. R.
Garmire, G.
George, E. M.
Gladders, M. D.
Gonzalez, A. H.
Halverson, N. W.
High, F. W.
Holder, G. P.
Holzapfel, W. L.
Hrubes, J. D.
Jones, C.
Joy, M.
Keisler, R.
Knox, L.
Lee, A. T.
Leitch, E. M.
Lueker, M.
Marrone, D. P.
McMahon, J. J.
Mehl, J.
Meyer, S. S.
Mohr, J. J.
Montroy, T. E.
Murray, S. S.
Padin, S.
Plagge, T.
Pryke, C.
Reichardt, C. L.
Rest, A.
Ruhl, J. E.
Schaffer, K. K.
Shaw, L.
Shirokoff, E.
Song, J.
Spieler, H. G.
Stalder, B.
Stanford, S. A.
Staniszewski, Z.
Stark, A. A.
Stubbs, C. W.
Vanderlinde, K.
Vieira, J. D.
Vikhlinin, A.
Williamson, R.
Yang, Y.
Zahn, O.
Zenteno, A.
TI SPT-CL J0546-5345: A MASSIVE z > 1 GALAXY CLUSTER SELECTED VIA THE
SUNYAEV-ZEL'DOVICH EFFECT WITH THE SOUTH POLE TELESCOPE
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE galaxies: clusters: individual (SPT-CL J0546-5345); galaxies: distances
and redshifts; galaxies: evolution
ID IRAC SHALLOW SURVEY; X-RAY; VELOCITY DISPERSIONS; PHOTOMETRIC REDSHIFTS;
TEMPERATURE RELATION; COSMOLOGY; CHANDRA; PROFILES; SAMPLE; GAS
AB We report the spectroscopic confirmation of SPT-CL J0546-5345 at < z > = 1.067. To date this is the most distant cluster to be spectroscopically confirmed from the 2008 South Pole Telescope (SPT) catalog, and indeed the first z > 1 cluster discovered by the Sunyaev-Zel'dovich Effect (SZE). We identify 21 secure spectroscopic members within 0.9 Mpc of the SPT cluster position, 18 of which are quiescent, early-type galaxies. From these quiescent galaxies we obtain a velocity dispersion of 1179-(+232)(167) km s(-1), ranking SPT-CL J0546-5345 as the most dynamically massive cluster yet discovered at z > 1. Assuming that SPT-CL J0546-5345 is virialized, this implies a dynamical mass of M(200) = 1.0(-0.4)(+0.6) x 10(15) M(circle dot), in agreement with the X-ray and SZE mass measurements. Combining masses from several independent measures leads to a best-estimate mass of M(200) = (7.95 +/- 0.92) x 10(14) M(circle dot). The spectroscopic confirmation of SPT-CL J0546-5345, discovered in the wide-angle, mass-selected SPT cluster survey, marks the onset of the high-redshift SZE-selected galaxy cluster era.
C1 [Brodwin, M.; Ashby, M. L. N.; Fazio, G. G.; Foley, R. J.; Forman, W. R.; Jones, C.; Murray, S. S.; Stalder, B.; Stark, A. A.; Stubbs, C. W.; Vikhlinin, A.] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
[Ruel, J.; High, F. W.; Rest, A.; Stubbs, C. W.] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA.
[Ade, P. A. R.] Cardiff Univ, Dept Phys & Astron, Cardiff CF24 3YB, S Glam, Wales.
[Aird, K. A.; Hrubes, J. D.; Marrone, D. P.] Univ Chicago, Chicago, IL 60637 USA.
[Andersson, K.; Bautz, M.] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA.
[Bazin, G.; Mohr, J. J.; Zenteno, A.] Univ Munich, Dept Phys, D-81679 Munich, Germany.
[Bazin, G.; Mohr, J. J.; Zenteno, A.] Excellence Cluster Univ, D-85758 Garching, Germany.
[Benson, B. A.; Bleem, L. E.; Carlstrom, J. E.; Chang, C. L.; Crawford, T. M.; Crites, A. T.; Gladders, M. D.; Keisler, R.; Leitch, E. M.; Marrone, D. P.; McMahon, J. J.; Mehl, J.; Meyer, S. S.; Padin, S.; Pryke, C.; Schaffer, K. K.; Vieira, J. D.; Williamson, R.] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA.
[Benson, B. A.; Carlstrom, J. E.; Chang, C. L.; McMahon, J. J.; Meyer, S. S.; Pryke, C.; Schaffer, K. K.] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA.
[Bleem, L. E.; Carlstrom, J. E.; Keisler, R.; Meyer, S. S.; Vieira, J. D.] Univ Chicago, Dept Phys, Chicago, IL 60637 USA.
[Carlstrom, J. E.; Crawford, T. M.; Crites, A. T.; Gladders, M. D.; Leitch, E. M.; Mehl, J.; Meyer, S. S.; Padin, S.; Plagge, T.; Pryke, C.; Williamson, R.] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA.
[De Haan, T.; Dobbs, M. A.; Dudley, J. P.; Holder, G. P.; Shaw, L.; Vanderlinde, K.] McGill Univ, Dept Phys, Quebec City, PQ H3A 2T8, Canada.
[Desai, S.; Song, J.; Yang, Y.] Univ Illinois, Dept Astron, Urbana, IL 61801 USA.
[Garmire, G.] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA.
[George, E. M.; Holzapfel, W. L.; Lee, A. T.; Lueker, M.; Plagge, T.; Reichardt, C. L.; Shirokoff, E.; Zahn, O.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Gonzalez, A. H.] Univ Florida, Dept Astron, Gainesville, FL 32611 USA.
[Halverson, N. W.] Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA.
[Halverson, N. W.] Univ Colorado, Dept Phys, Boulder, CO 80309 USA.
[Joy, M.] NASA Marshall Space Flight Ctr, Dept Space Sci, Huntsville, AL 35812 USA.
[Knox, L.; Stanford, S. A.] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA.
[Lee, A. T.; Spieler, H. G.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Phys, Berkeley, CA 94720 USA.
[McMahon, J. J.] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA.
[Mohr, J. J.] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany.
[Montroy, T. E.; Ruhl, J. E.; Staniszewski, Z.] Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA.
[Montroy, T. E.; Ruhl, J. E.; Staniszewski, Z.] Case Western Reserve Univ, CERCA, Cleveland, OH 44106 USA.
[Shaw, L.] Yale Univ, Dept Phys, New Haven, CT 06520 USA.
RP Brodwin, M (reprint author), Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA.
RI Stubbs, Christopher/C-2829-2012; Williamson, Ross/H-1734-2015;
Holzapfel, William/I-4836-2015;
OI Stubbs, Christopher/0000-0003-0347-1724; Williamson,
Ross/0000-0002-6945-2975; Aird, Kenneth/0000-0003-1441-9518; Reichardt,
Christian/0000-0003-2226-9169; Stark, Antony/0000-0002-2718-9996
FU National Science Foundation [ANT-0638937]; NSF Physics Frontier Center
[PHY-0114422]; Kavli Foundation; Gordon and Betty Moore Foundation;
NASA; Chandra Xray Observatory [SV4-74018, A31]; W. M. Keck Foundation;
Brinson Foundation
FX Visiting astronomer, Cerro Tololo Inter-American Observatory, National
Optical Astronomy Observatory, under contract with the National Science
Foundation; The SPT is supported by the National Science Foundation
through grant ANT-0638937. Partial support is also provided by the NSF
Physics Frontier Center grant PHY-0114422 to the Kavli Institute of
Cosmological Physics at the University of Chicago, the Kavli Foundation,
and the Gordon and Betty Moore Foundation. This work is based in part on
observations made with the Spitzer Space Telescope, which is operated by
the Jet Propulsion Laboratory, California Institute of Technology under
a contract with NASA. Support for this work was provided by NASA through
an award issued by JPL/Caltech. This paper includes data gathered with
the 6.5 meter Magellan Telescopes located at Las Campanas Observatory,
Chile. This work is based in part on observations obtained with the
Chandra Xray Observatory, under contract SV4-74018, A31 with the
Smithsonian Astrophysical Observatory which operates the Chandra for
NASA. We are very grateful for the efforts of the Spitzer, Chandra,
Magellan, and CTIO support staff without whom this paper would not be
possible. Support for M. B. was provided by the W. M. Keck Foundation.
B. S. acknowledges support from the Brinson Foundation.
NR 60
TC 74
Z9 75
U1 1
U2 5
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 20
PY 2010
VL 721
IS 1
BP 90
EP 97
DI 10.1088/0004-637X/721/1/90
PG 8
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 654TI
UT WOS:000282192900007
ER
PT J
AU Seo, HJ
Dodelson, S
Marriner, J
Mcginnis, D
Stebbins, A
Stoughton, C
Vallinotto, A
AF Seo, Hee-Jong
Dodelson, Scott
Marriner, John
Mcginnis, Dave
Stebbins, Albert
Stoughton, Chris
Vallinotto, Alberto
TI A GROUND-BASED 21 cm BARYON ACOUSTIC OSCILLATION SURVEY
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE dark energy; large-scale structure of universe; methods: numerical;
radio lines: galaxies
ID GALAXY REDSHIFT SURVEYS; LARGE-SCALE STRUCTURE; PROBING DARK ENERGY;
POWER SPECTRUM; INTERGALACTIC MEDIUM; 21-CM EMISSION; REAL-SPACE;
MATTER; REIONIZATION; FLUCTUATIONS
AB Baryon acoustic oscillations (BAO) provide a robust standard ruler with which to measure the acceleration of the universe. The BAO feature has so far been detected in optical galaxy surveys. Intensity mapping of neutral hydrogen emission with a ground-based radio telescope provides another promising window for measuring BAO at redshifts of order unity for relatively low cost. While the cylindrical radio telescope (CRT) proposed for these measurements will have excellent redshift resolution, it will suffer from poor angular resolution (arcminutes at best). We investigate the effect of angular resolution on the standard ruler test with BAO, using the Dark Energy Task Force Figure of Merit (FoM) as a benchmark. We then extend the analysis to include variations in the parameters characterizing the telescope and the underlying physics. Finally, we optimize the survey parameters (holding total cost fixed) and present an example of a CRT BAO survey that is competitive with Stage III dark energy experiments. The tools developed here form the backbone of a publicly available code that can be used to obtain estimates of cost and FoM for any set of survey parameters.
C1 [Seo, Hee-Jong; Dodelson, Scott; Marriner, John; Mcginnis, Dave; Stebbins, Albert; Stoughton, Chris; Vallinotto, Alberto] Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Batavia, IL 60510 USA.
[Dodelson, Scott] Univ Chicago, Ctr Astron & Astrophys, Chicago, IL 60637 USA.
RP Seo, HJ (reprint author), Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, POB 500, Batavia, IL 60510 USA.
EM sheejong@fnal.gov
FU US Department of Energy [DE-AC02-07CH11359]
FX We thank Patrick McDonald and Nickolay Y. Gnedin for extremely useful
communications. H.-J.S., S. D., J.M., D. M., A. S., C. S., and A. V. are
supported by the US Department of Energy under contract
DE-AC02-07CH11359.
NR 49
TC 44
Z9 47
U1 0
U2 2
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 20
PY 2010
VL 721
IS 1
BP 164
EP 173
DI 10.1088/0004-637X/721/1/164
PG 10
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 654TI
UT WOS:000282192900011
ER
PT J
AU Peng, YJ
Lilly, SJ
Kovac, K
Bolzonella, M
Pozzetti, L
Renzini, A
Zamorani, G
Ilbert, O
Knobel, C
Iovino, A
Maier, C
Cucciati, O
Tasca, L
Carollo, CM
Silverman, J
Kampczyk, P
De Ravel, L
Sanders, D
Scoville, N
Contini, T
Mainieri, V
Scodeggio, M
Kneib, JP
Le Fevre, O
Bardelli, S
Bongiorno, A
Caputi, K
Coppa, G
de la Torre, S
Franzetti, P
Garilli, B
Lamareille, F
Le Borgne, JF
Le Brun, V
Mignoli, M
Montero, EP
Pello, R
Ricciardelli, E
Tanaka, M
Tresse, L
Vergani, D
Welikala, N
Zucca, E
Oesch, P
Abbas, U
Barnes, L
Bordoloi, R
Bottini, D
Cappi, A
Cassata, P
Cimatti, A
Fumana, M
Hasinger, G
Koekemoer, A
Leauthaud, A
Maccagni, D
Marinoni, C
McCracken, H
Memeo, P
Meneux, B
Nair, P
Porciani, C
Presotto, V
Scaramella, R
AF Peng, Ying-Jie
Lilly, Simon J.
Kovac, Katarina
Bolzonella, Micol
Pozzetti, Lucia
Renzini, Alvio
Zamorani, Gianni
Ilbert, Olivier
Knobel, Christian
Iovino, Angela
Maier, Christian
Cucciati, Olga
Tasca, Lidia
Carollo, C. Marcella
Silverman, John
Kampczyk, Pawel
De Ravel, Loic
Sanders, David
Scoville, Nicholas
Contini, Thierry
Mainieri, Vincenzo
Scodeggio, Marco
Kneib, Jean-Paul
Le Fevre, Olivier
Bardelli, Sandro
Bongiorno, Angela
Caputi, Karina
Coppa, Graziano
de la Torre, Sylvain
Franzetti, Paolo
Garilli, Bianca
Lamareille, Fabrice
Le Borgne, Jean-Francois
Le Brun, Vincent
Mignoli, Marco
Montero, Enrique Perez
Pello, Roser
Ricciardelli, Elena
Tanaka, Masayuki
Tresse, Laurence
Vergani, Daniela
Welikala, Niraj
Zucca, Elena
Oesch, Pascal
Abbas, Ummi
Barnes, Luke
Bordoloi, Rongmon
Bottini, Dario
Cappi, Alberto
Cassata, Paolo
Cimatti, Andrea
Fumana, Marco
Hasinger, Gunther
Koekemoer, Anton
Leauthaud, Alexei
Maccagni, Dario
Marinoni, Christian
McCracken, Henry
Memeo, Pierdomenico
Meneux, Baptiste
Nair, Preethi
Porciani, Cristiano
Presotto, Valentina
Scaramella, Roberto
TI MASS AND ENVIRONMENT AS DRIVERS OF GALAXY EVOLUTION IN SDSS AND zCOSMOS
AND THE ORIGIN OF THE SCHECHTER FUNCTION
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE cosmology: observations; galaxies: active; galaxies: distances and
redshifts; galaxies: evolution
ID DIGITAL-SKY-SURVEY; ACTIVE GALACTIC NUCLEI; STAR-FORMATION HISTORY; VLT
DEEP SURVEY; 1ST EPOCH DATA; SIMILAR-TO 1; STELLAR MASS; REDSHIFT
SURVEY; LUMINOSITY FUNCTION; FORMING GALAXIES
AB We explore the simple inter-relationships between mass, star formation rate, and environment in the SDSS, zCOSMOS, and other deep surveys. We take a purely empirical approach in identifying those features of galaxy evolution that are demanded by the data and then explore the analytic consequences of these. We show that the differential effects of mass and environment are completely separable to z similar to 1, leading to the idea of two distinct processes of "mass quenching" and "environment quenching." The effect of environment quenching, at fixed over-density, evidently does not change with epoch to z similar to 1 in zCOSMOS, suggesting that the environment quenching occurs as large-scale structure develops in the universe, probably through the cessation of star formation in 30%-70% of satellite galaxies. In contrast, mass quenching appears to be a more dynamic process, governed by a quenching rate. We show that the observed constancy of the Schechter M* and alpha(s) for star-forming galaxies demands that the quenching of galaxies around and above M* must follow a rate that is statistically proportional to their star formation rates (or closely mimic such a dependence). We then postulate that this simple mass-quenching law in fact holds over a much broader range of stellar mass (2 dex) and cosmic time. We show that the combination of these two quenching processes, plus some additional quenching due to merging naturally produces (1) a quasi-static single Schechter mass function for star-forming galaxies with an exponential cutoff at a value M* that is set uniquely by the constant of proportionality between the star formation and mass quenching rates and (2) a double Schechter function for passive galaxies with two components. The dominant component (at high masses) is produced by mass quenching and has exactly the same M* as the star-forming galaxies but a faint end slope that differs by Delta alpha(s) similar to 1. The other component is produced by environment effects and has the same M* and alpha(s) as the star-forming galaxies but an amplitude that is strongly dependent on environment. Subsequent merging of quenched galaxies will modify these predictions somewhat in the denser environments, mildly increasing M* and making alpha(s) slightly more negative. All of these detailed quantitative inter-relationships between the Schechter parameters of the star-forming and passive galaxies, across a broad range of environments, are indeed seen to high accuracy in the SDSS, lending strong support to our simple empirically based model. We find that the amount of post-quenching "dry merging" that could have occurred is quite constrained. Our model gives a prediction for the mass function of the population of transitory objects that are in the process of being quenched. Our simple empirical laws for the cessation of star formation in galaxies also naturally produce the "anti-hierarchical" run of mean age with mass for passive galaxies, as well as the qualitative variation of formation timescale indicated by the relative alpha-element abundances.
C1 [Peng, Ying-Jie; Lilly, Simon J.; Kovac, Katarina; Knobel, Christian; Maier, Christian; Carollo, C. Marcella; Silverman, John; Kampczyk, Pawel; Oesch, Pascal; Barnes, Luke; Bordoloi, Rongmon; Porciani, Cristiano] ETH, Astron Inst, CH-8093 Zurich, Switzerland.
[Bolzonella, Micol; Pozzetti, Lucia; Zamorani, Gianni; Coppa, Graziano; Mignoli, Marco; Ricciardelli, Elena; Vergani, Daniela; Zucca, Elena; Cappi, Alberto; Nair, Preethi] INAF Osservatorio Astronom Bologna, I-40127 Bologna, Italy.
[Renzini, Alvio] INAF Osservatorio Astronom Padova, I-35122 Padua, Italy.
[Ilbert, Olivier; Cucciati, Olga; De Ravel, Loic; Kneib, Jean-Paul; Le Fevre, Olivier; de la Torre, Sylvain; Le Brun, Vincent; Tresse, Laurence; Welikala, Niraj; Abbas, Ummi; Cassata, Paolo] Lab Astrophys Marseille, F-13388 Marseille 13, France.
[Iovino, Angela; Presotto, Valentina] INAF Osservatorio Astronom Brera, I-20121 Milan, Italy.
[Tasca, Lidia; Scodeggio, Marco; Franzetti, Paolo; Garilli, Bianca; Bottini, Dario; Fumana, Marco; Maccagni, Dario; Memeo, Pierdomenico] INAF IASF Milano, I-20133 Milan, Italy.
[Sanders, David] Univ Hawaii, Honolulu, HI 96822 USA.
[Scoville, Nicholas] CALTECH, Dept Astron, Pasadena, CA 91125 USA.
[Contini, Thierry; Lamareille, Fabrice; Le Borgne, Jean-Francois; Montero, Enrique Perez; Pello, Roser] Univ Toulouse, Lab Astrophys Toulouse Tarbes, F-31400 Toulouse, France.
[Mainieri, Vincenzo; Meneux, Baptiste] European So Observ, D-85748 Garching, Germany.
[Bongiorno, Angela; Tanaka, Masayuki; Hasinger, Gunther] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany.
[Cimatti, Andrea] Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy.
[Koekemoer, Anton] Space Telescope Sci Inst, Baltimore, MD 21218 USA.
[Leauthaud, Alexei] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley Lab & Berkeley Ctr Cosmol Phys, Berkeley, CA 94720 USA.
[Marinoni, Christian] Ctr Phys Theor, F-13288 Marseille 9, France.
[McCracken, Henry] Univ Paris 06, Inst Astrophys Paris, CNRS, UMR 7095, F-75014 Paris, France.
[Scaramella, Roberto] INAF Osservatorio Astronom Roma, Osservatorio Astronom Roma, I-00040 Monte Porzio Catone, Italy.
RP Peng, YJ (reprint author), ETH, Astron Inst, Wolfgang Pauli Str 27, CH-8093 Zurich, Switzerland.
RI Pello, Roser/G-4754-2010; Le Fevre, Olivier/G-7389-2011; Kneib,
Jean-Paul/A-7919-2015; Zucca, Elena/O-9396-2015; Bardelli,
Sandro/O-9369-2015; Bolzonella, Micol/O-9495-2015; Cappi,
Alberto/O-9391-2015; Mignoli, Marco/O-9426-2015;
OI Kneib, Jean-Paul/0000-0002-4616-4989; Zucca, Elena/0000-0002-5845-8132;
Bardelli, Sandro/0000-0002-8900-0298; Bolzonella,
Micol/0000-0003-3278-4607; Cappi, Alberto/0000-0002-9200-7167; Mignoli,
Marco/0000-0002-9087-2835; Iovino, Angela/0000-0001-6958-0304;
Scaramella, Roberto/0000-0003-2229-193X; Barnes,
Luke/0000-0002-0016-9485; Bongiorno, Angela/0000-0002-0101-6624;
Scodeggio, Marco/0000-0002-2282-5850; Vergani,
Daniela/0000-0003-0898-2216; Oesch, Pascal/0000-0001-5851-6649; Garilli,
Bianca/0000-0001-7455-8750; Koekemoer, Anton/0000-0002-6610-2048
FU NASA [NAS 5-26555]; Swiss National Science Foundation
FX Based on observations undertaken at the European Southern Observatory
(ESO) Very Large Telescope (VLT) under Large Program 175.A-0839. Also
based on observations with the NASA/ESA Hubble Space Telescope, obtained
at the Space Telescope Science Institute, operated by AURA Inc., under
NASA contract NAS 5-26555, with the Subaru Telescope, operated by the
National Astronomical Observatory of Japan, with the telescopes of the
National Optical Astronomy Observatory, operated by the Association of
Universities for Research in Astronomy, Inc. (AURA) under cooperative
agreement with the National Science Foundation, and with the
Canada-France-Hawaii Telescope, operated by the National Research
Council of Canada, the Centre National de la Recherche Scientifique de
France and the University of Hawaii.; The zCOSMOS survey was undertaken
at the ESO VLT as Large Program 175.A-0839. We gratefully acknowledge
the work of many individuals, not appearing as authors of this paper,
whose work has enabled large surveys such as COSMOS and the SDSS. We
also thank Sebastiano Cantalupo for a very helpful and critical reading
of an earlier draft of this paper, and the anonymous referee for a
helpful and sympathetic reading. We gratefully acknowledge NASA's IDL
Astronomy Users Library, the IDL code base maintained by D. Schlegel,
the kcorrect package of M. Blanton, and the star formation rates from J.
Brinchmann taken from the MPA Web site. This work was supported in part
by the Swiss National Science Foundation.
NR 88
TC 531
Z9 534
U1 0
U2 11
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
EI 1538-4357
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 20
PY 2010
VL 721
IS 1
BP 193
EP 221
DI 10.1088/0004-637X/721/1/193
PG 29
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 654TI
UT WOS:000282192900013
ER
PT J
AU Lopez-Urrutia, JRC
Beiersdorfer, P
AF Lopez-Urrutia, J. R. Crespo
Beiersdorfer, P.
TI MEASUREMENT OF THE RADIATIVE DECAY RATE OF THE METASTABLE
(2s(2)2p(3/2)(5)3s(1/2))((J=2)) LEVEL IN Fe XVII
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE atomic data; atomic processes; line: formation; X-rays: general
ID BEAM ION-TRAP; SPECTRAL-LINE INTENSITIES; HIGHLY-CHARGED IONS; 1S2S
S-3(1) LEVEL; X-RAY; ATOMIC DATA; LABORATORY MEASUREMENTS; LIFETIME
MEASUREMENTS; CORONAL LINES; XMM-NEWTON
AB The radiative decay rate of the (2s(2)2p(3/2)(5)3s(1/2))(J=2) -> (2s(2)2p(6))(J=0) transition was measured in Ne-like Fe XVII. This transition forms the prominent magnetic quadrupole line, dubbed M2 or 3H, in the Fe XVII spectrum at 17.10 angstrom. Different theoretical models predict radiative rates for this transition that diverge by almost a factor of 2, making intensity predictions for this line uncertain in environments where it is affected by de-excitation due to either electron-impact collisions or photoionization. Our result of (2.04(-0.09)(+0.03)) x 10(5) s(-1) is very close to the value of 2.06 x 10(5) s(-1) predicted by the Flexible Atomic Code.
C1 [Lopez-Urrutia, J. R. Crespo; Beiersdorfer, P.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Lopez-Urrutia, JRC (reprint author), Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
RI Crespo Lopez-Urrutia, Jose R./F-7069-2011
OI Crespo Lopez-Urrutia, Jose R./0000-0002-2937-8037
FU NASA [NNG06WF08I]; US Department of Energy by the Lawrence Livermore
National Laboratory [DE-AC52-07NA27344]
FX P.B. gratefully acknowledges the help from Ming-Feng Gu in setting up
and executing the Flexible Atomic Code. This work was supported by
NASA's Astronomy and Physics Research and Analysis Program under work
order NNG06WF08I and performed under the auspices of the US Department
of Energy by the Lawrence Livermore National Laboratory under Contract
DE-AC52-07NA27344.
NR 48
TC 5
Z9 5
U1 0
U2 3
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 20
PY 2010
VL 721
IS 1
BP 576
EP 581
DI 10.1088/0004-637X/721/1/576
PG 6
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 654TI
UT WOS:000282192900040
ER
PT J
AU Arcavi, I
Gal-Yam, A
Kasliwal, MM
Quimby, RM
Ofek, EO
Kulkarni, SR
Nugent, PE
Cenko, SB
Bloom, JS
Sullivan, M
Howell, DA
Poznanski, D
Filippenko, AV
Law, N
Hook, I
Jonsson, J
Blake, S
Cooke, J
Dekany, R
Rahmer, G
Hale, D
Smith, R
Zolkower, J
Velur, V
Walters, R
Henning, J
Bui, K
McKenna, D
Jacobsen, J
AF Arcavi, Iair
Gal-Yam, Avishay
Kasliwal, Mansi M.
Quimby, Robert M.
Ofek, Eran O.
Kulkarni, Shrinivas R.
Nugent, Peter E.
Cenko, S. Bradley
Bloom, Joshua S.
Sullivan, Mark
Howell, D. Andrew
Poznanski, Dovi
Filippenko, Alexei V.
Law, Nicholas
Hook, Isobel
Joensson, Jakob
Blake, Sarah
Cooke, Jeff
Dekany, Richard
Rahmer, Gustavo
Hale, David
Smith, Roger
Zolkower, Jeff
Velur, Viswa
Walters, Richard
Henning, John
Bui, Kahnh
McKenna, Dan
Jacobsen, Janet
TI CORE-COLLAPSE SUPERNOVAE FROM THE PALOMAR TRANSIENT FACTORY: INDICATIONS
FOR A DIFFERENT POPULATION IN DWARF GALAXIES
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE supernovae: general
ID GAMMA-RAY BURSTS; RICH CIRCUMSTELLAR MEDIUM; DIGITAL SKY SURVEY;
RELATIVE FREQUENCIES; IC SUPERNOVA-2004GT; LOW-RESOLUTION; HOST
GALAXIES; IA SUPERNOVA; SN 2005GL; PROGENITOR
AB We use the first compilation of 72 core-collapse supernovae (SNe) from the Palomar Transient Factory (PTF) to study their observed subtype distribution in dwarf galaxies compared to giant galaxies. Our sample is the largest single-survey, untargeted, spectroscopically classified, homogeneous collection of core-collapse events ever assembled, spanning a wide host-galaxy luminosity range (down to M(r) approximate to -14 mag) and including a substantial fraction (>20%) of dwarf (M(r) approximate to -18 mag) hosts. We find more core-collapse SNe in dwarf galaxies than expected and several interesting trends emerge. We use detailed subclassifications of stripped-envelope core-collapse SNe and find that all Type I core-collapse events occurring in dwarf galaxies are either SNe Ib or broad-lined SNe Ic (SNe Ic-BL), while "normal" SNe Ic dominate in giant galaxies. We also see a significant excess of SNe IIb in dwarf hosts. We hypothesize that in lower metallicity hosts, metallicity-driven mass loss is reduced, allowing massive stars that would have appeared as "normal" SNe Ic in metal-rich galaxies to retain some He and H, exploding as Ib/IIb events. At the same time, another mechanism allows some stars to undergo extensive stripping and explode as SNe Ic-BL (and presumably also as long-duration gamma-ray bursts). Our results are still limited by small-number statistics, and our measurements of the observed N(Ib/c)/N(II) number ratio in dwarf and giant hosts (0.25(-0.15)(+0.3) and 0.23(-0.08)(+0.11), respectively; 1 sigma uncertainties) are consistent with previous studies and theoretical predictions. As additional PTF data accumulate, more robust statistical analyses will be possible, allowing the evolution of massive stars to be probed via the dwarf-galaxy SN population.
C1 [Arcavi, Iair; Gal-Yam, Avishay] Weizmann Inst Sci, Benoziyo Ctr Astrophys, Fac Phys, IL-76100 Rehovot, Israel.
[Kasliwal, Mansi M.; Quimby, Robert M.; Ofek, Eran O.; Kulkarni, Shrinivas R.; Law, Nicholas; Zolkower, Jeff] CALTECH, Cahill Ctr Astrophys, Pasadena, CA 91125 USA.
[Nugent, Peter E.; Poznanski, Dovi] Lawrence Berkeley Natl Lab, Computat Cosmol Ctr, Berkeley, CA 94720 USA.
[Bloom, Joshua S.; Poznanski, Dovi; Filippenko, Alexei V.] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA.
[Sullivan, Mark; Joensson, Jakob; Blake, Sarah] Univ Oxford, Dept Phys Astrophys, Oxford OX1 3RH, England.
[Howell, D. Andrew] Cumbres Observ Global Telescope Network, Goleta, CA 93117 USA.
[Howell, D. Andrew] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA.
[Law, Nicholas] Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S 3H4, Canada.
[Hook, Isobel] INAF Osserv Astron Roma, I-00040 Monte Porzio Catone, RM, Italy.
[Dekany, Richard; Rahmer, Gustavo; Hale, David; Smith, Roger; Zolkower, Jeff; Velur, Viswa; Walters, Richard; Henning, John; Bui, Kahnh; McKenna, Dan; Jacobsen, Janet] Caltech Opt Observ, Caltech Opt Observ, Pasadena, CA 91125 USA.
RP Arcavi, I (reprint author), Weizmann Inst Sci, Benoziyo Ctr Astrophys, Fac Phys, IL-76100 Rehovot, Israel.
EM iair.arcavi@weizmann.ac.il
OI Sullivan, Mark/0000-0001-9053-4820; Gal-Yam, Avishay/0000-0002-3653-5598
FU Israeli Science Foundation; US-Israel Binational Science Foundation; EU;
Benoziyo Center for Astrophysics; Minerva grant; Peter and Patricia
Gruber Awards; US Department of Energy Scientific Discovery
[DE-FG02-06ER06-04]; Royal Society; Weizmann-UK Making Connections
grant; Gary and Cynthia Bengier; US National Science Foundation
[AST-0908886]; TABASGO Foundation; US Department of Energy; National
Science Foundation [0941742]; Office of Science of the US Department of
Energy [DE-AC02-05CH11231]
FX The Weizmann Institute PTF partnership is supported by the Israeli
Science Foundation via grants to A. G. Collaborative work between A. G.
and S. R. K. is supported by the US-Israel Binational Science
Foundation. A. G. further acknowledges support from the EU FP7 Marie
Curie program via an IRG fellowship, the Benoziyo Center for
Astrophysics, a Minerva grant, and the Peter and Patricia Gruber Awards.
P.E.N. is supported by the US Department of Energy Scientific Discovery
through Advanced Computing program under contract DE-FG02-06ER06-04. M.
S. acknowledges support from the Royal Society; M. S. and A. G. are also
grateful for a Weizmann-UK Making Connections grant. A. V. F. and S. B.
C. acknowledge generous support from Gary and Cynthia Bengier, the
Richard and Rhoda Goldman Fund, US National Science Foundation grant
AST-0908886, and the TABASGO Foundation. J.S.B. was partially supported
by a SciDAC grant from the US Department of Energy and a grant from the
National Science Foundation (award 0941742). The National Energy
Research Scientific Computing Center, which is supported by the Office
of Science of the US Department of Energy under contract
DE-AC02-05CH11231, provided staff, computational resources, and data
storage for this project.; The WHT is operated on the island of La Palma
by the Isaac Newton Group in the Spanish Observatorio del Roque de los
Muchachos of the Instituto de Astrofisica de Canarias. Some of the data
presented herein were obtained at the W. M. Keck Observatory, which is
operated as a scientific partnership among the California Institute of
Technology, the University of California, and NASA; the observatory was
made possible by the generous financial support of the W. M. Keck
Foundation. We are grateful to the staff of the Keck, Lick, Palomar,
Roque de los Muchachos, VLT, and Gemini Observatories for their
assistance. We thank Chris Lidman for processing the X-Shooter data used
for the classification of PTF10bau.
NR 63
TC 90
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U1 0
U2 5
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 20
PY 2010
VL 721
IS 1
BP 777
EP 784
DI 10.1088/0004-637X/721/1/777
PG 8
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 654TI
UT WOS:000282192900057
ER
PT J
AU Anstey, MR
Corbett, MT
Majzoub, EH
Cordaro, JG
AF Anstey, Mitchell R.
Corbett, Michael T.
Majzoub, Eric H.
Cordaro, Joseph G.
TI Improved Synthesis of Bis(borano)hypophosphite Salts
SO INORGANIC CHEMISTRY
LA English
DT Article
ID P-STEREOGENIC PHOSPHINES; FREE HYDROGEN ACTIVATION; PROTIC ACID
BEHAVIOR; ASYMMETRIC CATALYSIS; BORANE ADDUCTS; AMINE-BORANE;
PHOSPHORUS; DERIVATIVES; PRECURSORS; DIHYDROGEN
AB A synthesis of the bis(borano)hypophosphite anion with various counterions has been developed to make use of more benign and commercially available reagents. This method avoids the use of potentially dangerous reagents used by previous methods and gives the final products in good yield. Details of the crystal structure determination of the sodium salt in space group Ama2 are given using a novel computational technique combined with Rietveld refinement.
C1 [Anstey, Mitchell R.; Corbett, Michael T.; Cordaro, Joseph G.] Sandia Natl Labs, Livermore, CA 94551 USA.
[Majzoub, Eric H.] Univ Missouri, Ctr Nanosci, St Louis, MO 63121 USA.
[Majzoub, Eric H.] Univ Missouri, Dept Phys & Astron, St Louis, MO 63121 USA.
RP Cordaro, JG (reprint author), Sandia Natl Labs, POB 969,MS 9403, Livermore, CA 94551 USA.
EM jgcorda@sandia.gov
FU U.S. Department of Energy, Office of Efficiency; Renewable Energy; Metal
Hydrides Center of Excellence [DE-AC04-94AL8500]
FX Sandia National Laboratories is a multiprogram laboratory operated by
Sandia Corp., a Lockheed Martin company, for the United States
Department of Energy under Contract DE-AC04-94AL85000. The authors
acknowledge the U.S. Department of Energy, Office of Efficiency and
Renewable Energy, and the Metal Hydrides Center of Excellence (Award
DE-AC04-94AL8500) for funding and Dr. Vitalie Stavila (Sandia National
Laboratories) for his intellectual and experimental contributions.
NR 34
TC 7
Z9 7
U1 1
U2 12
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0020-1669
J9 INORG CHEM
JI Inorg. Chem.
PD SEP 20
PY 2010
VL 49
IS 18
BP 8197
EP 8199
DI 10.1021/ic101326c
PG 3
WC Chemistry, Inorganic & Nuclear
SC Chemistry
GA 647PF
UT WOS:000281630000007
PM 20722376
ER
PT J
AU Bugaris, DE
Wells, DM
Yao, JY
Skanthakumar, S
Haire, RG
Soderholm, L
Ibers, JA
AF Bugaris, Daniel E.
Wells, Daniel M.
Yao, Jiyong
Skanthakumar, S.
Haire, Richard G.
Soderholm, L.
Ibers, James A.
TI Dichalcogenide Bonding in Seven Alkali-Metal Actinide Chalcogenides of
the KTh2Se6 Structure Type
SO INORGANIC CHEMISTRY
LA English
DT Article
ID CHARGE-DENSITY-WAVE; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURE; URANIUM
CHALCOGENIDES; OXYSULFURES DURANIUM; TRANSPORT-PROPERTIES; DES SULFURES;
SELENIDES; POTASSIUM; NPASTE
AB The solid-state compounds CsTh2Se6, Rb0.85U1.74S6, RbU2Se6, TIU2Se6, Cs-0.88(La0.68U1.32)Se-6, KNP2Se6, and CsNp2Se6 of the AAn(2)Q(6) family (A = alkali metal or TI; An = Th, U, Np; Q = S, Se, Te) have been synthesized by high-temperature techniques. All seven crystallize in space group lmmm of the orthorhombic system in the KTh2Se6 structure type. Evidence of long-range order and modulation were found in the X-ray diffraction patterns of TIU2Se6 and CsNp2Se6. A 4a X 4b supercell was found for TIU2Se6 whereas a 5a x 5b x 5c supercell was found for CsNp2Se6. All seven compounds exhibit Q-Q interactions and, depending on the radius ratio R-An/R-A1 disorder of the A cation over two sites. The electrical conductivity of RbU2Se6, measured along [100], is 6 x 10(-5) S cm(-1) at 298 K. The interatomic distances, including those in the modulated structure of TIU2Se6, and physical properties suggest the compounds may be formulated as containing tetravalent Th or U, but the formal oxidation state of Np in the modulated structure of CsNp2Se6 is less certain. The actinide contraction from Th to U to Np is apparent in the interatomic distances.
C1 [Bugaris, Daniel E.; Wells, Daniel M.; Yao, Jiyong; Ibers, James A.] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA.
[Wells, Daniel M.] Northwestern Univ, Mat Res Ctr, Evanston, IL 60208 USA.
[Skanthakumar, S.; Soderholm, L.] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
[Haire, Richard G.] Oak Ridge Natl Lab, Div Chem Sci, Oak Ridge, TN 37831 USA.
RP Ibers, JA (reprint author), Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA.
EM ibers@chem.northwestern.edu
FU Northwestern University by the U.S. Department of Energy, Basic Energy
Sciences, Chemical Sciences, Biosciences, and Geosciences Division and
Division of Materials Sciences and Engineering [ER-15522]; National
Science Foundation [DMR 05-20513]; U.S. Department of Energy, OBES,
Chemical Sciences Division [DEAC02-06CH11357]
FX This research was supported at Northwestern University by the U.S.
Department of Energy, Basic Energy Sciences, Chemical Sciences,
Biosciences, and Geosciences Division and Division of Materials Sciences
and Engineering Grant ER-15522 and by the MRSEC program of the National
Science Foundation (DMR 05-20513) at the Materials Research Center, and
at Argonne National Laboratory by the U.S. Department of Energy, OBES,
Chemical Sciences Division, under contract DEAC02-06CH11357. The
measurements of magnetism and electrical conductivity for
RbU2Se6 were made at Northwestern University in
the Materials Research Science and Engineering Center, Magnet and Low
Temperature Facility, supported by the National Science Foundation
(DMR05-20513). D.M.W. would like to thank Dr. Christos Malliakas of
Northwestern University and Dr. Danielle Gray of the University of
Illinois for helpful discussions.
NR 53
TC 14
Z9 14
U1 1
U2 11
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0020-1669
J9 INORG CHEM
JI Inorg. Chem.
PD SEP 20
PY 2010
VL 49
IS 18
BP 8381
EP 8388
DI 10.1021/ic1008895
PG 8
WC Chemistry, Inorganic & Nuclear
SC Chemistry
GA 647PF
UT WOS:000281630000027
PM 20712355
ER
PT J
AU Wendroff, B
AF Wendroff, Burton
TI A compact artificial viscosity equivalent to a tensor viscosity
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Artificial viscosity; Tensor viscosity; Staggered Lagrangian
AB We present a compact artificial viscosity for staggered grid Lagrangian hydrodynamics on polygonal cells in two Cartesian dimensions and using a decomposition into triangles we show that this viscosity is equivalent to a tensor viscosity of Campbell and Shashkov for quadrilaterals. (C) 2010 Elsevier Inc. All rights reserved.
C1 Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
RP Wendroff, B (reprint author), Los Alamos Natl Lab, Div Theoret, T-5,MS-B284, Los Alamos, NM 87545 USA.
EM bbw@lanl.gov
FU National Nuclear Security Administration of the US Department of Energy
at Los Alamos National Laboratory [W-7405-ENG-36, DE-AC52-06NA25396];
DOE; DOE Office of Science; Los Alamos National Laboratory
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 W-7405-ENG-36 and Contract
DE-AC52-06NA25396. The author acknowledges the partial support of the
DOE Advance Simulation and Computing (ASC) Program and the DOE Office of
Science ASCR Program, and the Laboratory Directed Research and
Development program (LDRD) at the Los Alamos National Laboratory.
NR 2
TC 3
Z9 3
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 0021-9991
J9 J COMPUT PHYS
JI J. Comput. Phys.
PD SEP 20
PY 2010
VL 229
IS 19
BP 6673
EP 6675
DI 10.1016/j.jcp.2010.05.034
PG 3
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 646VG
UT WOS:000281570700002
ER
PT J
AU Marksteiner, QR
AF Marksteiner, Q. R.
TI The use of tricubic interpolation with spectral derivatives to integrate
particle trajectories in complicated electromagnetic fields
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Electromagnetic; Hermite; Interpolation; Particle follower; Spectral
ID COLUMBIA NONNEUTRAL TORUS; PLASMAS; STELLARATOR; TRANSPORT
AB Codes that calculate the trajectories of particles in complicated electromagnetic fields often include spectral methods, which take advantage of the speed of FFTs to rapidly solve for the fields. In this case, Hermite tricubic interpolation can be used to calculate the fields between grid points, with spectral derivates used to determine the interpolation coefficients. This method is extremely accurate, and in the case of electrostatic fields produces an energy conserving force when incorporated into a particle follower code. Published by Elsevier Inc.
C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Marksteiner, QR (reprint author), Los Alamos Natl Lab, ISR-6,MS H851, Los Alamos, NM 87545 USA.
EM qrm@lanl.gov
FU US DOE [DE-FG02-02ER54690]; NSF-DOE Partnership in Basic Plasma Science
[NSF-PHY-03-17359]; NSF [NSF-PHY-04-49813, NSF-PHY-06-13662]
FX The authors thank Paul Ennever and Dr. Thomas Sunn Pedersen. This work
was supported by the US DOE Grant No. DE-FG02-02ER54690, the NSF-DOE
Partnership in Basic Plasma Science, Grant No. NSF-PHY-03-17359, the NSF
CAREER program, Grant Nos. NSF-PHY-04-49813 and NSF-PHY-06-13662.
NR 21
TC 0
Z9 0
U1 1
U2 4
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 SEP 20
PY 2010
VL 229
IS 19
BP 6688
EP 6695
DI 10.1016/j.jcp.2010.05.011
PG 8
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 646VG
UT WOS:000281570700004
ER
PT J
AU Rector, DR
Stewart, ML
AF Rector, David R.
Stewart, Mark L.
TI A semi-implicit lattice method for simulating flow
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Lattice-Boltzmann method; Incompressible Navier-Stokes equation;
Lid-driven cavity; Unsteady Poiseuille flow; Oscillating plate
ID INCOMPRESSIBLE VISCOUS FLOWS; NAVIER-STOKES EQUATIONS; BOLTZMANN BGK
MODEL; BOUNDARY-CONDITIONS; KINETIC SCHEME; PRESSURE
AB We propose a new semi-implicit lattice numerical method for modeling fluid flow that depends only on local primitive variable information (density, pressure, velocity) and not on relaxed upstream distribution function values. This method has the potential for reducing parallel processor communication and permitting larger time steps than the lattice-Boltzmann method. Several benchmark problems are solved to demonstrate the accuracy of the method. (C) 2010 Elsevier Inc. All rights reserved.
C1 [Rector, David R.; Stewart, Mark L.] Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA.
RP Rector, DR (reprint author), Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA.
EM david.rector@pnl.gov
FU US Department of Energy
FX This work was performed under a US Department of Energy LDRD program.
NR 22
TC 3
Z9 3
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 SEP 20
PY 2010
VL 229
IS 19
BP 6732
EP 6743
DI 10.1016/j.jcp.2010.05.020
PG 12
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 646VG
UT WOS:000281570700007
ER
PT J
AU Lin, PT
Shadid, JN
AF Lin, Paul T.
Shadid, John N.
TI Towards large-scale multi-socket, multicore parallel simulations:
Performance of an MPI-only semiconductor device simulator
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Multicore; Multicore efficiency; MPI-only; Multilevel preconditioners;
Newton-Krylov; Drift-diffusion; Semiconductor devices
ID DOMAIN DECOMPOSITION PRECONDITIONERS; SMOOTHED AGGREGATION;
LINEAR-SYSTEMS; FORMULATION; FLOW
AB This preliminary study considers the scaling and performance of a finite element (FE) semiconductor device simulator on a set of multi-socket, multicore architectures with nonuniform memory access (NUMA) compute nodes. These multicore architectures include two linux clusters with multicore processors: a quad-socket, quad-core AMD Opteron platform and a dual-socket, quad-core Intel Xeon Nehalem platform; and a dual-socket, six-core AMD Opteron workstation. These platforms have complex memory hierarchies that include local core-based cache, local socket-based memory, access to memory on the same mainboard from another socket, and then memory across network links to different nodes. The specific semiconductor device simulator used in this study employs a fully-coupled Newton-Krylov solver with domain decomposition and multilevel preconditioners. Scaling results presented include a large-scale problem of 100+ million unknowns on 4096 cores and a comparison with the Cray XT3/4 Red Storm capability platform. Although the MPI- only device simulator employed for this work can take advantage of all the cores of quad-core and six-core CPUs, the efficiency of the linear system solve is decreasing with increased core count and eventually a different programming paradigm will be needed. (C) 2010 Elsevier Inc. All rights reserved.
C1 [Lin, Paul T.; Shadid, John N.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Lin, PT (reprint author), Sandia Natl Labs, POB 5800,MS 0316, Albuquerque, NM 87185 USA.
EM ptlin@sandia.gov
FU DOE; DOE Office of Science
FX Partially supported by the DOE NNSA ASC program and the DOE Office of
Science ASCR Applied Math Research program and ASCR IAA program at
Sandia National Laboratory. 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 48
TC 10
Z9 10
U1 1
U2 6
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 SEP 20
PY 2010
VL 229
IS 19
BP 6804
EP 6818
DI 10.1016/j.jcp.2010.05.023
PG 15
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 646VG
UT WOS:000281570700010
ER
PT J
AU Luo, H
Luo, LQ
Nourgaliev, R
Mousseau, VA
Dinh, N
AF Luo, Hong
Luo, Luqing
Nourgaliev, Robert
Mousseau, Vincent A.
Dinh, Nam
TI A reconstructed discontinuous Galerkin method for the compressible
Navier-Stokes equations on arbitrary grids
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Reconstruction schemes; Discontinuous Galerkin methods; Compressible
Navier-Stokes equations
ID FINITE-ELEMENT METHOD; UNSTRUCTURED MESHES; CONSERVATION-LAWS; EULER
EQUATIONS; SCHEMES; FLOWS; CONSTRUCTION; VOLUME
AB A reconstruction-based discontinuous Galerkin (RDG) method is presented for the solution of the compressible Navier-Stokes equations on arbitrary grids. The RDG method, originally developed for the compressible Euler equations, is extended to discretize viscous and heat fluxes in the Navier-Stokes equations using a so-called inter-cell reconstruction, where a smooth solution is locally reconstructed using a least-squares method from the underlying discontinuous DG solution. Similar to the recovery-based DG (rDG) methods, this reconstructed DG method eliminates the introduction of ad hoc penalty or coupling terms commonly found in traditional DG methods. Unlike rDG methods, this RDG method does not need to judiciously choose a proper form of a recovered polynomial, thus is simple, flexible, and robust, and can be used on arbitrary grids. The developed RDG method is used to compute a variety of flow problems on arbitrary meshes to demonstrate its accuracy, efficiency, robustness, and versatility. The numerical results indicate that this RDG method is able to deliver the same accuracy as the well-known Bassi-Rebay II scheme, at a half of its computing costs for the discretization of the viscous fluxes in the NavierStokes equations, clearly demonstrating its superior performance over the existing DG methods for solving the compressible Navier-Stokes equations. (C) 2010 Elsevier Inc. All rights reserved.
C1 [Luo, Hong; Luo, Luqing] N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA.
[Nourgaliev, Robert; Mousseau, Vincent A.; Dinh, Nam] Idaho Natl Lab, Thermal Sci & Safety Anal Dept, Idaho Falls, ID 83415 USA.
RP Luo, H (reprint author), N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA.
EM hong_luo@ncsu.edu
RI Luo, Hong/A-9133-2011
FU US Department of Energy [DE-AC07-051D14517 (INL/CON-10-17570)]; INL
FX This manuscript has been authored by Battelle Energy Alliance, LLC under
contract No. DE-AC07-051D14517 (INL/CON-10-17570) with the US Department
of Energy. The United States Government retains and the published, by
accepting the article for publication, acknowledges that the United
States Government retains a nonexclusive, paid-up, irrevocable,
world-wide license to publish or reproduce the published form of this
manuscript, or allow others to do so, for United States Government
purposes. The first author would like to acknowledge the partial support
for this work provided by the INL staff-faculty exchange program, while
he was in residence at Reactor Safety Simulation Group, Idaho National
Laboratory, Idaho Falls, ID.
NR 37
TC 42
Z9 47
U1 0
U2 6
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 SEP 20
PY 2010
VL 229
IS 19
BP 6961
EP 6978
DI 10.1016/j.jcp.2010.05.033
PG 18
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 646VG
UT WOS:000281570700018
ER
PT J
AU Lin, G
Tartakovsky, AM
Tartakovsky, DM
AF Lin, G.
Tartakovsky, A. M.
Tartakovsky, D. M.
TI Uncertainty quantification via random domain decomposition and
probabilistic collocation on sparse grids
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Uncertainty quantification; Random composite; Polynomial chaos;
Stochastic finite element; Stochastic collocation method
ID HETEROGENEOUS POROUS-MEDIA; PARTIAL-DIFFERENTIAL-EQUATIONS; RANDOM INPUT
DATA; MONOMIAL CUBATURE RULES; PARAMETRIC UNCERTAINTY; ORTHOGONAL
POLYNOMIALS; TRANSIENT FLOW; SOBOLEV SPACES; MEAN FLOW; AQUIFERS
AB Quantitative predictions of the behavior of many deterministic systems are uncertain due to ubiquitous heterogeneity and insufficient characterization by data. We present a computational approach to quantify predictive uncertainty in complex phenomena, which is modeled by (partial) differential equations with uncertain parameters exhibiting multiscale variability. The approach is motivated by flow in random composites whose internal architecture (spatial arrangement of constitutive materials) and spatial variability of properties of each material are both uncertain. The proposed two-scale framework combines a random domain decomposition (RDD) and a probabilistic collocation method (PCM) on sparse grids to quantify these two sources of uncertainty, respectively. The use of sparse grid points significantly reduces the overall computational cost, especially for random processes with small correlation lengths. A series of one-, two-, and three-dimensional computational examples demonstrate that the combined RDD-PCM approach yields efficient, robust and non-intrusive approximations for the statistics of diffusion in random composites. Published by Elsevier Inc.
C1 [Lin, G.; Tartakovsky, A. M.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Tartakovsky, D. M.] Univ Calif San Diego, Dept Mech & Aerosp Engn, La Jolla, CA 92093 USA.
RP Lin, G (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA.
EM guang.lin@pnl.gov; dmt@ucsd.edu
RI Lin, Guang/D-1376-2011; Tartakovsky, Daniel/E-7694-2013
FU US DOE Office of Advanced Scientific Computing Research; US Department
of Energy [DE-AC05-76RL01830]
FX This work was supported by Applied Mathematics program of the US DOE
Office of Advanced Scientific Computing Research. Simulations were
performed using the computational resources of the Environmental
Molecular Sciences Laboratory. The Pacific Northwest National Laboratory
is operated by Battelle for the US Department of Energy under Contract
DE-AC05-76RL01830.
NR 59
TC 24
Z9 24
U1 0
U2 12
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 SEP 20
PY 2010
VL 229
IS 19
BP 6995
EP 7012
DI 10.1016/j.jcp.2010.05.036
PG 18
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 646VG
UT WOS:000281570700020
ER
PT J
AU Athenes, M
Marinica, MC
AF Athenes, Manuel
Marinica, Mihai-Cosmin
TI Free energy reconstruction from steered dynamics without post-processing
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Free-energy calculations; Statistical thermodynamics; Computer
chemistry; Molecular simulation; Monte Carlo method
ID MONTE-CARLO SIMULATION; MOLECULAR-DYNAMICS; STOCHASTIC DYNAMICS;
ENSEMBLE AVERAGES; SYSTEMS; ALGORITHM; DIFFUSION; STATES; EQUILIBRIUM;
INFORMATION
AB Various methods achieving importance sampling in ensembles of nonequilibrium trajectories enable one to estimate free energy differences and, by maximum-likelihood post-processing, to reconstruct free energy landscapes. Here, based on Bayes theorem, we propose a more direct method in which a posterior likelihood function is used both to construct the steered dynamics and to infer the contribution to equilibrium of all the sampled states. The method is implemented with two steering schedules. First, using non-autonomous steering, we calculate the migration barrier of the vacancy in Fe-a. Second, using an autonomous scheduling related to metadynamics and equivalent to temperature-accelerated molecular dynamics, we accurately reconstruct the two-dimensional free energy landscape of the 38-atom Lennard-Jones cluster as a function of an orientational bond-order parameter and energy, down to the solid-solid structural transition temperature of the cluster and without maximum-likelihood post-processing. (C) 2010 Elsevier Inc. All rights reserved.
C1 [Athenes, Manuel; Marinica, Mihai-Cosmin] CEA Saclay, Serv Rech Met Phys, Dept Mat Nucl, F-91191 Gif Sur Yvette, France.
[Athenes, Manuel] LLNL, Condensed Matter & Mat Div, Phys & Life Sci Directorate, Livermore, CA 94551 USA.
RP Athenes, M (reprint author), CEA Saclay, Serv Rech Met Phys, Dept Mat Nucl, Batiment 520, F-91191 Gif Sur Yvette, France.
EM Manuel.Athenes@cea.fr
RI Marinica, Mihai -Cosmin/C-7058-2009
FU Commissariat a L'Energie Atomique; GENCI-CINES [2009-x2009096020]
FX We are much indebted to Eric Vanden-Eijnden for suggesting the use of
autonomous steering [12] and for advising us. We warmly thank Gabriel
Stoltz for relevant comments on early versions of the manuscript,
Florent Calvo for providing us with the (Q4-gradient
subroutine, Giovanni Ciccotti, John Chodera and David Minh for valuable
advice. This work was mainly financed by Commissariat a L'Energie
Atomique (DSOE program), partly carried out at Lawrence Livermore
National Laboratory (under a VSP agreement) and performed using HPC
resources from GENCI-CINES (Grant 2009-x2009096020).
NR 70
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U1 1
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
EI 1090-2716
J9 J COMPUT PHYS
JI J. Comput. Phys.
PD SEP 20
PY 2010
VL 229
IS 19
BP 7129
EP 7146
DI 10.1016/j.jcp.2010.06.003
PG 18
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 646VG
UT WOS:000281570700027
ER
PT J
AU Liovic, P
Francois, M
Rudman, M
Manasseh, R
AF Liovic, Petar
Francois, Marianne
Rudman, Murray
Manasseh, Richard
TI Efficient simulation of surface tension-dominated flows through enhanced
interface geometry interrogation
SO JOURNAL OF COMPUTATIONAL PHYSICS
LA English
DT Article
DE Height functions; Curvature; Surface tension; Volume-of-Fluid;
Level-set; Elliptic solvers
ID COUPLED LEVEL SET; OF-FLUID METHOD; DISCONTINUOUS COEFFICIENTS; VOLUME
FRACTIONS; BUBBLE DYNAMICS; ALGORITHM; CAVITATION; CURVATURE; EQUATIONS;
SYSTEMS
AB In this paper, three improvements for modelling surface tension-dominated interfacial flows using interface tracking-based solution algorithms are presented. We have developed an improved approach to curvature estimation for incorporation into modern mesh-based surface tension models such as the Continuum Surface Force (CSF) and Sharp Surface Force (SSF) models. The scheme involves generating samples of curvature estimates from the multitude of height functions that can be generated from VOF representations of interfaces, and applying quality statistics based on interface orientation and smoothness to choose optimal candidates from the samples. In this manner, the orientation-dependence of past schemes for height function-based curvature estimation is ameliorated, the use of compact stencils for efficient computation can be maintained, and robustness is enhanced even in the presence of noticeable subgrid-scale disturbances in the interface representation. For surface tension-dominated flows, the explicit capillary timestep restriction is relaxed through timescale-separated slope limiting that identifies spurious modes in curvature evolution and omits them from contributing to surface force computations, thus promoting efficiency in simulation through the use of less timesteps. Efficiency in flow simulation is further promoted by incorporating awareness of interface location into multigrid preconditioning for Krylov subspace-based solution of elliptic problems. This use of interface-cognizance in solving problems such as the Helmholtz equation and the Poisson equation enables multigrid-like convergence in discontinuous-coefficient elliptic problems without the expense of constructing the Galerkin coarse-grid operator. The key improvements in the surface tension modelling and the numerical linear algebra are also applicable to level-set-based interfacial flow simulation. (C) 2010 Elsevier Inc. All rights reserved.
C1 [Liovic, Petar] CSIRO, Math Informat & Stat Div, Highett, Vic 3190, Australia.
[Francois, Marianne] Los Alamos Natl Lab, Comp Computat & Stat Sci Div, Los Alamos, NM 87545 USA.
[Rudman, Murray] CSIRO, Math & Informat Sci Div, Clayton, Vic 3168, Australia.
[Manasseh, Richard] Univ Melbourne, Dept Mech Engn, Melbourne, Vic 3010, Australia.
RP Liovic, P (reprint author), CSIRO, Math Informat & Stat Div, Graham Rd, Highett, Vic 3190, Australia.
EM Petar.Liovic@csiro.au
RI Rudman, Murray/C-6737-2008; Liovic, Petar/E-7081-2010; Francois,
Marianne/B-2423-2012; Manasseh, Richard/A-2088-2010;
OI Rudman, Murray/0000-0002-5649-4180; Manasseh,
Richard/0000-0003-4572-4945; Francois, Marianne/0000-0003-3062-6234
FU NCI National Facility at the Australian National University;
Preventative Health Flagship of the Commonwealth Scientific and
Industrial Research Organization (CSIRO); US Department of Energy ASC;
National Nuclear Security Administration [DE-AC52-06NA25396]
FX This work was supported by the NCI National Facility at the Australian
National University www.nci.org.au. PL and RM acknowledge the support of
the Preventative Health Flagship of the Commonwealth Scientific and
Industrial Research Organization (CSIRO). MF acknowledges the support of
the US Department of Energy ASC and LDRD programs at Los Alamos National
Laboratory under contract DE-AC52-06NA25396 with Los Alamos National
Security, LLC for the National Nuclear Security Administration.
NR 46
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U1 1
U2 12
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 SEP 20
PY 2010
VL 229
IS 19
BP 7520
EP 7544
DI 10.1016/j.jcp.2010.06.034
PG 25
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 646VG
UT WOS:000281570700049
ER
PT J
AU Kelkar, S
Ding, M
Chu, S
Robinson, BA
Arnold, B
Meijer, A
Eddebbarh, AA
AF Kelkar, Sharad
Ding, Mei
Chu, Shaoping
Robinson, Bruce A.
Arnold, Bill
Meijer, Arend
Eddebbarh, Al-Aziz
TI Modeling solute transport through saturated zone ground water at 10 km
scale: Example from the Yucca Mountain license application
SO JOURNAL OF CONTAMINANT HYDROLOGY
LA English
DT Article
DE Modeling solute transport; Breakthrough curves; Dispersion; Matrix
diffusion; Volcanic formations; Fractured rock
ID CONTAMINANT TRANSPORT; POROUS-MEDIA; SIMULATION; MIGRATION; ROCKS
AB This paper presents a study of solute transport through ground water in the saturated zone and the resulting breakthrough curves (BTCs), using a field-scale numerical model that incorporates the processes of advection, dispersion, matrix diffusion in fractured volcanic formations, sorption, and colloid-facilitated transport. Such BTCs at compliance boundaries are often used as performance measures for a site. The example considered here is that of the saturated zone study prepared for the Yucca Mountain license application. The saturated zone at this site occurs partly in volcanic, fractured rock formations and partly in alluvial formations. This paper presents a description of the site and the ground water flow model, the development of the conceptual model of transport, model uncertainties, model validation, and the influence of uncertainty in input parameters on the downstream BTCs at the Yucca Mountain site. (c) 2010 Elsevier By. All rights reserved.
C1 [Kelkar, Sharad; Ding, Mei; Chu, Shaoping; Robinson, Bruce A.; Eddebbarh, Al-Aziz] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Arnold, Bill] Sandia Natl Labs, Albuquerque, NM 87815 USA.
[Meijer, Arend] GCX Inc, Tucson, AZ 85737 USA.
RP Kelkar, S (reprint author), Los Alamos Natl Lab, MS T003, Los Alamos, NM 87545 USA.
EM kelkar@lanl.gov
RI Robinson, Bruce/F-6031-2010
FU United States Department of Energy's National Nuclear Security
Administration [DE-AC04-94AL85000]
FX This manuscript has been authored by Los Alamos National Laboratory, and
by Sandia National Laboratories. Sandia National Laboratories is a
multi-program 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. The
United States Government retains and the publisher, by accepting the
article for publication, acknowledges that the United States Government
retains a non-exclusive, paid-up, irrevocable, world-wide license to
publish or reproduce the published form of this manuscript, or allow
others to do so, for United States Government purposes. The views
expressed in this article are those of the authors and do not
necessarily reflect the views or policies of the United States
Department of Energy, Sandia National Laboratories, Los Alamos National
Laboratory, or GCX, Inc.
NR 45
TC 5
Z9 5
U1 2
U2 4
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0169-7722
J9 J CONTAM HYDROL
JI J. Contam. Hydrol.
PD SEP 20
PY 2010
VL 117
IS 1-4
BP 7
EP 25
DI 10.1016/j.jconhyd.2010.05.003
PG 19
WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources
SC Environmental Sciences & Ecology; Geology; Water Resources
GA 655LX
UT WOS:000282252600002
PM 20633953
ER
PT J
AU Gong, R
Lu, C
Wu, WM
Cheng, H
Gu, B
Watson, DB
Criddle, CS
Kitanidis, PK
Brooks, SC
Jardine, PM
Luo, J
AF Gong, R.
Lu, C.
Wu, W. -M.
Cheng, H.
Gu, B.
Watson, D. B.
Criddle, C. S.
Kitanidis, P. K.
Brooks, S. C.
Jardine, P. M.
Luo, J.
TI Estimating kinetic mass transfer by resting-period measurements in
flow-interruption tracer tests
SO JOURNAL OF CONTAMINANT HYDROLOGY
LA English
DT Article
DE Flow-interruption tracer test; Mass transfer; Multiple-well system;
Memory function; Breakthrough curve
ID HIGHLY CONTAMINATED AQUIFER; POROUS-MEDIA; DIFFUSION; TRANSPORT;
URANIUM; TIME; BIOAVAILABILITY; BIODEGRADATION; COLUMNS; ZONE
AB Flow-interruption tracer test is an effective approach to identify kinetic mass transfer processes for solute transport in subsurface media. By switching well pumping and resting, one may alter the dominant transport mechanism and generate special concentration patterns for identifying kinetic mass transfer processes. In the present research, we conducted three-phase (i.e., pumping, resting, and pumping) field-scale flow-interruption tracer tests using a conservative tracer bromide in a multiple-well system installed at the US Department of Energy Site, Oak Ridge, TN. A novel modeling approach based on the resting-period measurements was developed to estimate the mass transfer parameters. This approach completely relied on the measured breakthrough curves without requiring detailed aquifer characterization and solving transport equations in nonuniform, transient flow fields. Additional measurements, including hydraulic heads and tracer concentrations in large pumping wells, were taken to justify the assumption that mass transfer processes dominated concentration change during resting periods. The developed approach can be conveniently applied to any linear mass transfer model. Both first-order and multirate mass transfer models were applied to analyze the breakthrough curves at various monitoring wells. The multirate mass transfer model was capable of jointly fitting breakthrough curve behavior, showing the effectiveness and flexibility for incorporating aquifer heterogeneity and scale effects in upscaling effective mass transfer models. (c) 2010 Elsevier B.V. All rights reserved.
C1 [Gong, R.; Lu, C.; Luo, J.] Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA.
[Wu, W. -M.; Criddle, C. S.; Kitanidis, P. K.] Stanford Univ, Dept Civil & Environm Engn, Stanford, CA 94305 USA.
[Cheng, H.] Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China.
[Gu, B.; Watson, D. B.; Brooks, S. C.; Jardine, P. M.] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA.
RP Luo, J (reprint author), Georgia Inst Technol, Sch Civil & Environm Engn, Atlanta, GA 30332 USA.
EM jian.luo@ce.gatech.edu
RI Brooks, Scott/B-9439-2012; Gu, Baohua/B-9511-2012; Cheng,
Hefa/A-1193-2007; Watson, David/C-3256-2016
OI Brooks, Scott/0000-0002-8437-9788; Gu, Baohua/0000-0002-7299-2956;
Cheng, Hefa/0000-0003-4911-6971; Watson, David/0000-0002-4972-4136
FU U.S. Department of Energy (DOE) Office of Science, Biological and
Environmental Research
FX This research was sponsored by the U.S. Department of Energy (DOE)
Office of Science, Biological and Environmental Research, as part of the
Integrated Field Research Challenge (IFRC) at Oak Ridge National
Laboratory (ORNL). ORNL is managed by UT-Battelle, LLC, for DOE under
Contract DE-ACO5-00OR22725. We thank the constructive comments from two
anonymous reviewers and Dr. A Valocchi.
NR 30
TC 3
Z9 3
U1 1
U2 15
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0169-7722
J9 J CONTAM HYDROL
JI J. Contam. Hydrol.
PD SEP 20
PY 2010
VL 117
IS 1-4
BP 37
EP 45
DI 10.1016/j.jconhyd.2010.06.003
PG 9
WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources
SC Environmental Sciences & Ecology; Geology; Water Resources
GA 655LX
UT WOS:000282252600004
PM 20638152
ER
PT J
AU Ofan, A
Gaathon, O
Zhang, LH
Bakhru, S
Bakhru, H
Zhu, YM
Welch, D
Osgood, RM
AF Ofan, Avishai
Gaathon, Ophir
Zhang, Lihua
Bakhru, Sasha
Bakhru, Hssaram
Zhu, Yimei
Welch, David
Osgood, Richard M., Jr.
TI Spherical solid He nanometer bubbles in an anisotropic complex oxide
SO PHYSICAL REVIEW B
LA English
DT Article
ID X-RAY-DIFFRACTION; EQUATION-OF-STATE; DOUBLE WAVE-GUIDE;
ION-IMPLANTATION; LITHIUM-NIOBATE; PHASE-DIAGRAM; HELIUM; LINBO3;
IRRADIATION; SILICON
AB We show, using room temperature, high-resolution electron microscopy studies, that implanted He in LiNbO(3) nucleates and accumulates as bubbles. These He inclusions are at similar to 20 GPa pressure and most probably in the solid phase. In addition, the energetically favored shape of the inclusions in their as-implanted form is spherical and not oblate; this spherical shape is due to the fact that their diameter is below a critical radius for balancing the surface and elastic energies as predicted by elastic theory. When annealed, the characteristic length scale of the He inclusions increases, forming faceted bubbles. Annealing also causes the He inclusions to migrate and accumulate into strings due to the preferred {10 (1) over bar4}-pyramidal-twinning planes.
C1 [Ofan, Avishai; Gaathon, Ophir; Osgood, Richard M., Jr.] Columbia Univ, Ctr Integrated Sci & Engn, New York, NY 10027 USA.
[Zhang, Lihua; Zhu, Yimei; Welch, David] Brookhaven Natl Lab, Upton, NY 11973 USA.
[Bakhru, Sasha; Bakhru, Hssaram] SUNY Albany, Coll Nanoscale Sci & Engn, Albany, NY 12222 USA.
RP Ofan, A (reprint author), Columbia Univ, Ctr Integrated Sci & Engn, New York, NY 10027 USA.
EM ao2199@columbia.edu
RI Zhang, Lihua/F-4502-2014
FU NSF [DMR-08-0668206]; U.S. Department of Energy, Office of Basic Energy
Sciences [DE-AC02-98CH10886]
FX We thank K. Kisslinger and D. Su for assistance on TEM imaging and
helpful discussions. This work was supported by the NSF (Grant No.
DMR-08-0668206). In addition, the research was 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.
NR 39
TC 20
Z9 21
U1 5
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 SEP 20
PY 2010
VL 82
IS 10
AR 104113
DI 10.1103/PhysRevB.82.104113
PG 8
WC Physics, Condensed Matter
SC Physics
GA 652KU
UT WOS:000282006100002
ER
PT J
AU Schafgans, AA
Homes, CC
Gu, GD
Komiya, S
Ando, Y
Basov, DN
AF Schafgans, A. A.
Homes, C. C.
Gu, G. D.
Komiya, Seiki
Ando, Yoichi
Basov, D. N.
TI Breakdown of the universal Josephson relation in spin-ordered cuprate
superconductors
SO PHYSICAL REVIEW B
LA English
DT Article
ID HIGH-TEMPERATURE SUPERCONDUCTORS; MAGNETIC-FIELD; STATE; PSEUDOGAP;
LA2-XSRXCUO4; DEPENDENCE; RESONANCE; DYNAMICS; DENSITY; PHASE
AB We present c-axis infrared optical data on a number of Ba-, Sr-, and Nd-doped cuprates of the La(2)CuO(4) (La214) series in which we observe significant deviations from the universal Josephson relation linking the normal-state transport (dc conductivity sigma(dc) measured at T(c)) with the superfluid density (rho(s)): rho(s) proportional to sigma(dc)(T(c)). We find the violation of Josephson scaling is associated with striking enhancement of the anisotropy in the superfluid density. The data allow us to link the breakdown of Josephson interlayer physics with the development of magnetic order in the CuO(2) planes.
C1 [Schafgans, A. A.; Basov, D. N.] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA.
[Homes, C. C.; Gu, G. D.] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
[Komiya, Seiki] Cent Res Inst Elect Power Ind, Kanagawa 2400196, Japan.
[Ando, Yoichi] Osaka Univ, Inst Sci & Ind Res, Osaka 5670047, Japan.
RP Schafgans, AA (reprint author), Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA.
EM aschafgans@physics.ucsd.edu
RI Ando, Yoichi/B-8163-2013; Gu, Genda/D-5410-2013
OI Ando, Yoichi/0000-0002-3553-3355; Gu, Genda/0000-0002-9886-3255
FU NSF; AFOSR MURI; KAKENHI [19674002, 20030004]
FX We thank S. A. Kivelson, E. Fradkin, J. M. Tranquada, and E. Berg for
great discussions and acknowledge funding from the NSF and AFOSR MURI.
Y.A. was supported by KAKENHI under Grants No. 19674002 and No.
20030004.
NR 38
TC 12
Z9 12
U1 0
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 SEP 20
PY 2010
VL 82
IS 10
AR 100505
PG 4
WC Physics, Condensed Matter
SC Physics
GA 652KU
UT WOS:000282006100001
ER
PT J
AU Williams, TJ
Aczel, AA
Baggio-Saitovitch, E
Bud'ko, SL
Canfield, PC
Carlo, JP
Goko, T
Kageyama, H
Kitada, A
Munevar, J
Ni, N
Saha, SR
Kirschenbaum, K
Paglione, J
Sanchez-Candela, DR
Uemura, YJ
Luke, GM
AF Williams, T. J.
Aczel, A. A.
Baggio-Saitovitch, E.
Bud'ko, S. L.
Canfield, P. C.
Carlo, J. P.
Goko, T.
Kageyama, H.
Kitada, A.
Munevar, J.
Ni, N.
Saha, S. R.
Kirschenbaum, K.
Paglione, J.
Sanchez-Candela, D. R.
Uemura, Y. J.
Luke, G. M.
TI Superfluid density and field-induced magnetism in Ba(Fe1-xCox)(2)As-2
and Sr(Fe1-xCox)(2)As-2 measured with muon spin relaxation
SO PHYSICAL REVIEW B
LA English
DT Article
ID CUPRATE SUPERCONDUCTORS; PENETRATION DEPTH; VORTEX CORES; ROTATION;
TL2BA2CUO6+DELTA; EXCITATIONS; HEAT; TC
AB We report muon spin rotation (mu SR) measurements of single-crystal Ba(Fe1-xCox)(2)As-2 and Sr(Fe1-xCox)(2)As-2. From measurements of the magnetic field penetration depth lambda we find that for optimally and overdoped samples, 1/lambda(T -> 0)(2) varies monotonically with the superconducting transition temperature T-C. Within the superconducting state we observe a positive shift in the muon precession signal, likely indicating that the applied field induces an internal magnetic field. The size of the induced field decreases with increasing doping but is present for all Co concentrations studied.
C1 [Williams, T. J.; Aczel, A. A.; Goko, T.; Luke, G. M.] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada.
[Baggio-Saitovitch, E.; Munevar, J.; Sanchez-Candela, D. R.] Ctr Brasilieiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil.
[Bud'ko, S. L.; Canfield, P. C.; Ni, N.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Bud'ko, S. L.; Canfield, P. C.; Ni, N.] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
[Carlo, J. P.; Goko, T.; Uemura, Y. J.] Columbia Univ, Dept Phys, New York, NY 10027 USA.
[Goko, T.] TRIUMF, Vancouver, BC V6T 2A3, Canada.
[Kageyama, H.; Kitada, A.] Kyoto Univ, Dept Chem, Kyoto 6068502, Japan.
[Saha, S. R.; Kirschenbaum, K.; Paglione, J.] Univ Maryland, Dept Phys, Ctr Nanophys & Adv Mat, College Pk, MD 20742 USA.
[Luke, G. M.] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada.
RP Williams, TJ (reprint author), McMaster Univ, Dept Phys & Astron, 1280 Main St W, Hamilton, ON L8S 4M1, Canada.
EM luke@mcmaster.ca
RI Kageyama, Hiroshi/A-4602-2010; Candela, Dalber/G-3636-2012; Canfield,
Paul/H-2698-2014; Saitovitch, Elisa/A-6769-2015; Kitada,
Atsushi/H-5819-2015; Luke, Graeme/A-9094-2010; Aczel, Adam/A-6247-2016;
Williams, Travis/A-5061-2016
OI Luke, Graeme/0000-0003-4762-1173; Kitada, Atsushi/0000-0002-4387-8687;
Aczel, Adam/0000-0003-1964-1943; Williams, Travis/0000-0003-3212-2726
FU NSERC; CIFAR; US NSF under the Materials World Network (MWN)
[DMR-0806846]; Department of Energy, Basic Energy Sciences
[DE-AC02-07CH11358]; AFOSR-MURI [FA9550-09-1-0603]; Partnership for
International Research and Education (PIRE) [OISE-0968226]
FX We appreciate the hospitality of the TRIUMF Centre for Molecular and
Materials Science where the majority of these experiments were
performed. Research at McMaster University is supported by NSERC and
CIFAR. Work at Columbia University is supported by the US NSF under the
Materials World Network (MWN: DMR-0806846) and the Partnership for
International Research and Education (PIRE: OISE-0968226) programs. Work
at Ames Laboratory was supported by the Department of Energy, Basic
Energy Sciences under Contract No. DE-AC02-07CH11358. Work at the
University of Maryland was supported by AFOSR-MURI Grant No.
FA9550-09-1-0603.
NR 48
TC 20
Z9 20
U1 0
U2 11
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 SEP 20
PY 2010
VL 82
IS 9
AR 094512
DI 10.1103/PhysRevB.82.094512
PG 7
WC Physics, Condensed Matter
SC Physics
GA 652KG
UT WOS:000282004700006
ER
PT J
AU Graham, PW
Harnik, R
Rajendran, S
AF Graham, Peter W.
Harnik, Roni
Rajendran, Surjeet
TI Observing the dimensionality of our parent vacuum
SO PHYSICAL REVIEW D
LA English
DT Article
ID ANISOTROPY; UNIVERSE
AB It seems generic to have vacua with lower dimensionality than ours. We consider the possibility that the observable universe originated in a transition from one of these vacua. Such a universe has anisotropic spatial curvature. This may be directly observable through its late-time effects on the CMB if the last period of slow-roll inflation was not too long. These affect the entire sky, leading to correlations which persist up to the highest CMB multipoles, thus allowing a conclusive detection above cosmic variance. Further, this anisotropic curvature causes different dimensions to expand at different rates. This leads to other potentially observable signals including a quadrupolar anisotropy in the CMB which limits the size of the curvature. Conversely, if isotropic curvature is observed it may be evidence that our parent vacuum was at least 3 + 1 dimensional. Such signals could reveal our history of decompactification, providing evidence for the existence of vastly different vacua.
C1 [Graham, Peter W.; Harnik, Roni] Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
[Harnik, Roni] Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA.
[Rajendran, Surjeet] MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA.
[Rajendran, Surjeet] MIT, Dept Phys, Cambridge, MA 02139 USA.
RP Graham, PW (reprint author), Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
OI Graham, Peter/0000-0002-1600-1601
FU DOE Office of Nuclear Physics [DE-FG02-94ER40818]; NSF [PHY-0600465]
FX We would like to thank Savas Dimopoulos, Sergei Dubovsky, Ben Freivogel,
Steve Kahn, John March-Russell, Stephen Shenker, Leonard Susskind, and
Kirsten Wickelgren for useful discussions and the Dalitz Institute at
Oxford for hospitality. S. R. was supported by the DOE Office of Nuclear
Physics under Grant No. DE-FG02-94ER40818. S. R. is also supported by
NSF Grant No. PHY-0600465. While this work was in progress we became
aware of interesting work by another group working on different signals
of a similar general framework [27].
NR 44
TC 20
Z9 20
U1 0
U2 0
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 SEP 20
PY 2010
VL 82
IS 6
AR 063524
DI 10.1103/PhysRevD.82.063524
PG 15
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 652YB
UT WOS:000282047400001
ER
PT J
AU Aaltonen, T
Adelman, J
Gonzalez, BA
Amerio, S
Amidei, D
Anastassov, A
Annovi, A
Antos, J
Apollinari, G
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
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
Deviveiros, PO
Di Canto, A
di Giovanni, GP
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
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Rossin, R
Roy, P
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Safonov, A
Sakumoto, WK
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Sartori, L
Sato, K
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Savoy-Navarro, A
Schlabach, P
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Schmidt, EE
Schmidt, MA
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Schwarz, T
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Scribano, A
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Stentz, D
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Takeuchi, Y
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Thompson, GA
Thomson, E
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Ttito-Guzman, P
Tkaczyk, S
Toback, D
Tokar, S
Tollefson, K
Tomura, T
Tonelli, D
Torre, S
Torretta, D
Totaro, P
Tourneur, S
Trovato, M
Tsai, SY
Tu, Y
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Ukegawa, F
Uozumi, S
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Varganov, A
Vataga, E
Vazquez, F
Velev, G
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Vila, I
Vilar, R
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Wagner, RL
Wagner, W
Wagner-Kuhr, J
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Wallny, R
Wang, SM
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Wright, T
Wu, X
Wurthwein, F
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Yang, UK
Yang, YC
Yao, WM
Yeh, GP
Yi, K
Yoh, J
Yorita, K
Yoshida, T
Yu, GB
Yu, I
Yu, SS
Yun, JC
Zanetti, A
Zeng, Y
Zhang, X
Zheng, Y
Zucchelli, S
AF Aaltonen, T.
Adelman, J.
Alvarez Gonzalez, B.
Amerio, S.
Amidei, D.
Anastassov, A.
Annovi, A.
Antos, J.
Apollinari, G.
Apresyan, A.
Arisawa, T.
Artikov, A.
Asaadi, J.
Ashmanskas, W.
Attal, A.
Aurisano, A.
Azfar, F.
Badgett, W.
Barbaro-Galtieri, A.
Barnes, V. E.
Barnett, B. A.
Barria, P.
Bartos, P.
Bauer, G.
Beauchemin, P. -H.
Bedeschi, F.
Beecher, D.
Behari, S.
Bellettini, G.
Bellinger, J.
Benjamin, D.
Beretvas, A.
Bhatti, A.
Binkley, M.
Bisello, D.
Bizjak, I.
Blair, R. E.
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, H. S.
Budd, S.
Burkett, K.
Busetto, G.
Bussey, P.
Buzatu, A.
Byrum, K. L.
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, S. H.
Chen, Y. C.
Chertok, M.
Chiarelli, G.
Chlachidze, G.
Chlebana, F.
Cho, K.
Chokheli, D.
Chou, J. P.
Chung, K.
Chung, W. H.
Chung, Y. S.
Chwalek, T.
Ciobanu, C. I.
Ciocci, M. A.
Clark, A.
Clark, D.
Compostella, G.
Convery, M. E.
Conway, J.
Corbo, M.
Cordelli, M.
Cox, C. A.
Cox, D. J.
Crescioli, F.
Almenar, C. Cuenca
Cuevas, J.
Culbertson, R.
Cully, J. C.
Dagenhart, D.
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.
Deviveiros, P. -O.
Di Canto, A.
di Giovanni, G. P.
Di Ruzza, B.
Dittmann, J. R.
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, H. C.
Farrington, S.
Fedorko, W. T.
Feild, R. G.
Feindt, M.
Fernandez, J. P.
Ferrazza, C.
Field, R.
Flanagan, G.
Forrest, R.
Frank, M. J.
Franklin, M.
Freeman, J. C.
Furic, I.
Gallinaro, M.
Galyardt, J.
Garberson, F.
Garcia, J. E.
Garfinkel, A. F.
Garosi, P.
Gerberich, H.
Gerdes, D.
Gessler, A.
Giagu, S.
Giakoumopoulou, V.
Giannetti, P.
Gibson, K.
Gimmell, J. L.
Ginsburg, C. M.
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, A. T.
Goulianos, K.
Gresele, A.
Grinstein, S.
Grosso-Pilcher, C.
Group, R. C.
Grundler, U.
da Costa, J. Guimaraes
Gunay-Unalan, Z.
Haber, C.
Hahn, S. R.
Halkiadakis, E.
Han, B. -Y.
Han, J. Y.
Happacher, F.
Hara, K.
Hare, D.
Hare, M.
Harr, R. F.
Hartz, M.
Hatakeyama, K.
Hays, C.
Heck, M.
Heinrich, J.
Herndon, M.
Heuser, J.
Hewamanage, S.
Hidas, D.
Hill, C. S.
Hirschbuehl, D.
Hocker, A.
Hou, S.
Houlden, M.
Hsu, S. -C.
Hughes, R. E.
Hurwitz, M.
Husemann, U.
Hussein, M.
Huston, J.
Incandela, J.
Introzzi, G.
Iori, M.
Ivanov, A.
James, E.
Jang, D.
Jayatilaka, B.
Jeon, E. J.
Jha, M. K.
Jindariani, S.
Johnson, W.
Jones, M.
Joo, K. K.
Jun, S. Y.
Jung, J. E.
Junk, T. R.
Kamon, T.
Kar, D.
Karchin, P. E.
Kato, Y.
Kephart, R.
Ketchum, W.
Keung, J.
Khotilovich, V.
Kilminster, B.
Kim, D. H.
Kim, H. S.
Kim, H. W.
Kim, J. E.
Kim, M. J.
Kim, S. B.
Kim, S. H.
Kim, Y. K.
Kimura, N.
Kirsch, L.
Klimenko, S.
Kondo, K.
Kong, D. J.
Konigsberg, J.
Korytov, A.
Kotwal, A. V.
Kreps, M.
Kroll, J.
Krop, D.
Krumnack, N.
Kruse, M.
Krutelyov, V.
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CA CDF Collaboration
TI Search for New Physics with a Dijet Plus Missing E-T Signature in
p(p)over-bar Collisions at root s=1.96 TeV
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID SCALAR LEPTOQUARKS; HADRON COLLIDERS; FERMILAB; FB(-1); JETS
AB We present results of a signature-based search for new physics using a dijet plus missing transverse energy (E-T) data sample collected in 2 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV with the CDF II detector at the Fermilab Tevatron. We observe no significant event excess with respect to the standard model prediction and extract a 95% C. L. upper limit on the cross section times acceptance for a potential contribution from a nonstandard model process. The search is made by using novel, data-driven techniques for estimating backgrounds that are applicable to first searches at the LHC.
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[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; Piacentino, Giovanni/K-3269-2015;
Martinez Ballarin, Roberto/K-9209-2015; Gorelov, Igor/J-9010-2015;
Prokoshin, Fedor/E-2795-2012; Canelli, Florencia/O-9693-2016;
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; Lazzizzera, Ignazio/E-9678-2015; 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; Warburton,
Andreas/N-8028-2013; Kim, Soo-Bong/B-7061-2014; Lysak,
Roman/H-2995-2014; Moon, Chang-Seong/J-3619-2014; De Cecco,
Sandro/B-1016-2012; 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
OI Introzzi, Gianluca/0000-0002-1314-2580; Piacentino,
Giovanni/0000-0001-9884-2924; 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; 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; Lazzizzera, Ignazio/0000-0001-5092-7531;
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;
Warburton, Andreas/0000-0002-2298-7315; Moon,
Chang-Seong/0000-0001-8229-7829; Punzi, Giovanni/0000-0002-8346-9052;
Annovi, Alberto/0000-0002-4649-4398; Ivanov, Andrew/0000-0002-9270-5643
FU U.S. Department of 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; National Research Foundation of Korea; Science and
Technology Facilities Council; Royal Society, United Kingdom; Institut
National de Physique Nucleaire et Physique des Particules/CNRS; Russian
Foundation for Basic Research; Ministerio de Ciencia e Innovacion;
Programa Consolider-Ingenio, Spain; Slovak RD Agency; Academy of Finland
FX We thank M. Kramer for providing next-to-leading order leptoquark
production cross sections. We thank Fermilab staff and the technical
staffs of the participating institutions for their vital contributions.
This work was supported by the U.S. Department of Energy and 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, United
Kingdom; 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 24
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U2 17
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 SEP 20
PY 2010
VL 105
IS 13
AR 131801
DI 10.1103/PhysRevLett.105.131801
PG 8
WC Physics, Multidisciplinary
SC Physics
GA 653AK
UT WOS:000282054100003
ER
PT J
AU Buividovich, PV
Chernodub, MN
Kharzeev, DE
Kalaydzhyan, T
Luschevskaya, EV
Polikarpov, MI
AF Buividovich, P. V.
Chernodub, M. N.
Kharzeev, D. E.
Kalaydzhyan, T.
Luschevskaya, E. V.
Polikarpov, M. I.
TI Magnetic-Field-Induced Insulator-Conductor Transition in SU(2) Quenched
Lattice Gauge Theory
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID DILEPTON EMISSION; QCD; COLLISIONS; VIOLATION; PHOTON; PLASMA
AB We study the correlator of two vector currents in quenched SU(2) lattice gauge theory with a chirally invariant lattice Dirac operator with a constant external magnetic field. It is found that in the confinement phase the correlator of the components of the current parallel to the magnetic field decays much slower than in the absence of a magnetic field, while for other components the correlation length slightly decreases. We apply the maximal entropy method to extract the corresponding spectral function. In the limit of zero frequency this spectral function yields the electric conductivity of quenched theory. We find that in the confinement phase the external magnetic field induces nonzero electric conductivity along the direction of the field, transforming the system from an insulator into an anisotropic conductor. In the deconfinement phase the conductivity does not exhibit any sizable dependence on the magnetic field.
C1 [Buividovich, P. V.; Kalaydzhyan, T.; Luschevskaya, E. V.; Polikarpov, M. I.] ITEP, Moscow 117218, Russia.
[Buividovich, P. V.; Luschevskaya, E. V.] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia.
[Chernodub, M. N.] Univ Tours, LMPT, CNRS UMR 6083, F-37200 Tours, France.
[Chernodub, M. N.] Univ Ghent, DMPA, B-9000 Ghent, Belgium.
[Kharzeev, D. E.] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
[Kharzeev, D. E.] Yale Univ, Dept Phys, New Haven, CT 06520 USA.
[Kalaydzhyan, T.] DESY, Theory Grp, D-22607 Hamburg, Germany.
RP Buividovich, PV (reprint author), ITEP, B Cheremushkinskaya 25, Moscow 117218, Russia.
RI Chernodub, Maxim/B-9426-2009
OI Chernodub, Maxim/0000-0003-2101-4914
FU RFBR [08-02-00661-a, 09-02-00338-a]; DFG-RFBR [436 RUS]; Russian Federal
Agency for Nuclear Power; U.S. Department of Energy [DE-AC02-98CH10886];
Dynasty foundation; FAIR-Russia Research Center (FRRC); French Agence
Nationale de la Recherche [ANR-09-JCJC HYPERMAG]; [NSh-679.2008.2]
FX The authors are grateful to A. S. Gorsky, A. Krikun, V. I. Shevchenko,
O. V. Teryaev, and V. I. Zakharov for interesting and useful
discussions. This work was partly supported by Grants RFBR No.
08-02-00661-a, 09-02-00338-a and DFG-RFBR No. 436 RUS, a Grant for
scientific schools No. NSh-679.2008.2, and by the Russian Federal Agency
for Nuclear Power. The work of D. K. was supported by Contract No.
DE-AC02-98CH10886 with the U.S. Department of Energy. P. B. was
partially supported by a personal grant from the Dynasty foundation and
from the FAIR-Russia Research Center (FRRC). The work of M. N. C. was
partially supported by the French Agence Nationale de la Recherche
project ANR-09-JCJC HYPERMAG. The calculations were partially done on
the MVS 50 K at the Moscow Joint Supercomputer Center.
NR 28
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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 SEP 20
PY 2010
VL 105
IS 13
AR 132001
DI 10.1103/PhysRevLett.105.132001
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653AK
UT WOS:000282054100004
PM 21230764
ER
PT J
AU Wang, M
Guo, ZY
AF Wang, Moran
Guo, Zeng-Yuan
TI Understanding of temperature and size dependences of effective thermal
conductivity of nanotubes
SO PHYSICS LETTERS A
LA English
DT Article
DE Thermal conductivity; One-dimensional materials; Heat conduction;
Non-Fourier conduction; Nanotubes
ID CARBON NANOTUBES; HEAT PROPAGATION; LENGTH
AB The anomalous thermal transport properties of nanotubes may lead to many important applications, but the mechanisms are still unclear. In this work, we present new governing equations for non-Fourier heat conduction in nanomaterials based on the concept of thermomass. The effective thermal conductivities of nanotubes are therefore predicted which agree very well with the available experimental data. Analysis suggests that the inertial effect of heat and the confined heat flux by nanostructured surfaces are two key mechanisms causing the anomalous temperature and size dependences of effective thermal conductivity of nanotubes. Published by Elsevier B.V.
C1 [Wang, Moran] Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA.
[Wang, Moran] Los Alamos Natl Lab, Phys Condense Matter & Complex Syst Theoret Div, Los Alamos, NM 87545 USA.
[Guo, Zeng-Yuan] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China.
RP Wang, M (reprint author), Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87545 USA.
EM mwang@lanl.gov
RI Wang, Moran/A-1150-2010
FU DOE [20080727PRD2]; National Natural Science Foundation of China
[50606018]
FX We acknowledge helpful discussions with L. Shi and R.K. Chen on
experimental details and with G. Chen on theory. This work is supported
by the DOE LDRD Project 20080727PRD2 through the J.R. Oppenheimer
Fellowship awarded to M.W. and the National Natural Science Foundation
of China (No. 50606018).
NR 32
TC 41
Z9 44
U1 1
U2 26
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0375-9601
EI 1873-2429
J9 PHYS LETT A
JI Phys. Lett. A
PD SEP 20
PY 2010
VL 374
IS 42
BP 4312
EP 4315
DI 10.1016/j.physleta.2010.08.058
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 661LD
UT WOS:000282728900007
ER
PT J
AU Airapetian, A
Akopovz, N
Akopov, Z
Aschenauer, EC
Augustyniak, W
Avakian, R
Avetissian, A
Avetisyan, E
Bacchetta, A
Belostotski, S
Bianchi, N
Blok, HP
Borissov, A
Bowles, J
Brodsky, I
Bryzgalov, V
Burns, J
Capiluppi, M
Capitani, GP
Cisbani, E
Ciullo, G
Contalbrigo, M
Dalpiaz, PF
Deconinck, W
De Leo, R
De Nardo, L
De Sanctis, E
Diefenthaler, M
Di Nezza, P
Duren, M
Ehrenfried, M
Elbakian, G
Ellinghaus, F
Elschenbroichk, U
Fabbrif, R
Fantonij, A
Felawka, L
Frullani, S
Gabbert, D
Gapienkos, G
Gapienkos, V
Garibaldi, F
Gharibyan, V
Giordano, F
Gliske, S
Golembiovskaya, M
Hadjidakis, C
Hartig, M
Hasch, D
Hill, G
Hillenbrand, A
Hoek, M
Holler, Y
Hristova, I
Imazu, Y
Lvanilov, A
Jackson, HE
Jo, HS
Joosten, S
Kaiser, R
Karyan, G
Keri, T
Kinney, E
Kisselev, A
Kobayashi, N
Korotkov, V
Kozlov, V
Kravchenko, P
Lagamba, L
Lamb, R
Lapikas, L
Lehmann, I
Lenisa, P
Linden-Levy, LA
Ruiz, AL
Lorenzon, W
Lu, XG
Le, XR
Ma, BQ
Mahon, D
Makins, NCR
Manaenkov, SI
Manfre, L
Mao, Y
Marianski, B
de la Ossad, AM
Marukyan, H
Miller, CA
Miyachi, Y
Movsisyan, A
Murray, M
Mussgiller, A
Nappi, E
Naryshkin, Y
Nass, A
Negodaev, M
Nowak, WD
Pappalardo, LL
Perez-Benito, R
Pickert, N
Raithel, M
Reimer, PE
Reolon, AR
Riedl, C
Rith, K
Rosner, G
Rostomyan, A
Rubin, J
Ryckbosch, D
Salomatin, Y
Sanftl, F
Schafer, A
Schnell, G
Seitz, B
Shibata, TA
Shutov, V
Stancari, M
Statera, M
Steffens, E
Steijger, J
Stenzel, H
Stewart, J
Stinzingh, F
Taroian, S
Terkulov, A
Trzcinski, A
Tytgat, M
van der Nat, PB
Van Haarlem, Y
Van Hulse, C
Veretennikov, D
Vikhrov, V
Vilardi, I
Vogel, C
Wang, S
Yaschenkof, S
Ye, H
Ye, Z
Yen, S
Yu, W
Zeiler, D
Zihlmann, B
Zupranski, P
AF Airapetian, A.
Akopovz, N.
Akopov, Z.
Aschenauer, E. C.
Augustyniak, W.
Avakian, R.
Avetissian, A.
Avetisyan, E.
Bacchetta, A.
Belostotski, S.
Bianchi, N.
Blok, H. P.
Borissov, A.
Bowles, J.
Brodsky, I.
Bryzgalov, V.
Burns, J.
Capiluppi, M.
Capitani, G. P.
Cisbani, E.
Ciullo, G.
Contalbrigo, M.
Dalpiaz, P. F.
Deconinck, W.
De Leo, R.
De Nardo, L.
De Sanctis, E.
Diefenthaler, M.
Di Nezza, P.
Dueren, M.
Ehrenfried, M.
Elbakian, G.
Ellinghaus, F.
Elschenbroichk, U.
Fabbrif, R.
Fantonij, A.
Felawka, L.
Frullani, S.
Gabbert, D.
Gapienkos, G.
Gapienkos, V.
Garibaldi, F.
Gharibyan, V.
Giordano, F.
Gliske, S.
Golembiovskaya, M.
Hadjidakis, C.
Hartig, M.
Hasch, D.
Hill, G.
Hillenbrand, A.
Hoek, M.
Holler, Y.
Hristova, I.
Imazu, Y.
Lvanilov, A.
Jackson, H. E.
Jo, H. S.
Joosten, S.
Kaiser, R.
Karyan, G.
Keri, T.
Kinney, E.
Kisselev, A.
Kobayashi, N.
Korotkov, V.
Kozlov, V.
Kravchenko, P.
Lagamba, L.
Lamb, R.
Lapikas, L.
Lehmann, I.
Lenisa, P.
Linden-Levy, L. A.
Ruiz, A. Lopez
Lorenzon, W.
Lu, X. -G.
Le, X. -R.
Ma, B. -Q.
Mahon, D.
Makins, N. C. R.
Manaenkov, S. I.
Manfre, L.
Mao, Y.
Marianski, B.
de la Ossad, A. Martinez
Marukyan, H.
Miller, C. A.
Miyachi, Y.
Movsisyan, A.
Murray, M.
Mussgiller, A.
Nappi, E.
Naryshkin, Y.
Nass, A.
Negodaev, M.
Nowak, W. -D.
Pappalardo, L. L.
Perez-Benito, R.
Pickert, N.
Raithel, M.
Reimer, P. E.
Reolon, A. R.
Riedl, C.
Rith, K.
Rosner, G.
Rostomyan, A.
Rubin, J.
Ryckbosch, D.
Salomatin, Y.
Sanftl, F.
Schaefer, A.
Schnell, G.
Seitz, B.
Shibata, T. -A.
Shutov, V.
Stancari, M.
Statera, M.
Steffens, E.
Steijger, J. J. M.
Stenzel, H.
Stewart, J.
Stinzingh, F.
Taroian, S.
Terkulov, A.
Trzcinski, A.
Tytgat, M.
van der Nat, P. B.
Van Haarlem, Y.
Van Hulse, C.
Veretennikov, D.
Vikhrov, V.
Vilardi, I.
Vogel, C.
Wang, S.
Yaschenkof, S.
Ye, H.
Ye, Z.
Yen, S.
Yu, W.
Zeiler, D.
Zihlmann, B.
Zupranski, P.
TI Effects of transversity in deep-inelastic scattering by polarized
protons
SO PHYSICS LETTERS B
LA English
DT Article
DE Semi-inclusive DIS; Single-spin asymmetries; Polarized structure
functions; Transversity; Collins function
ID HERMES; COLLINS; LEPTOPRODUCTION; DISTRIBUTIONS; ASYMMETRIES; NUCLEON;
QUARKS; TARGET; QCD
AB Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the azimuthal angles of the target polarization (phi s) and the produced hadron (phi) is found to have a substantial sin(phi +phi s) modulation for the production of pi(+), pi(-) and K(+). This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For pi(0) and K(-) production the amplitude of this Fourier component is consistent with zero. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Mussgiller, A.; Nass, A.; Raithel, M.; Rith, K.; Sanftl, F.; Steffens, E.; Stinzingh, F.; Vogel, C.; Zeiler, D.] Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany.
[Bacchetta, A.; Jackson, H. E.; Reimer, P. E.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
[De Leo, R.; Ehrenfried, M.; Lagamba, L.; Nappi, E.; Vilardi, I.] Ist Nazl Fis Nucl, Sez Bari, I-70124 Bari, Italy.
[Mahon, D.; Mao, Y.; Wang, S.; Ye, H.] Peking Univ, Sch Phys, Beijing 100871, Peoples R China.
[Kinney, E.; de la Ossad, A. Martinez] Univ Colorado, Nucl Phys Lab, Boulder, CO 80309 USA.
[Avetisyan, E.; Borissov, A.; Deconinck, W.; De Nardo, L.; Dueren, M.; Elbakian, G.; Giordano, F.; Hartig, M.; Holler, Y.; Mussgiller, A.; Ye, Z.; Zihlmann, B.] DESY, D-22603 Hamburg, Germany.
[Aschenauer, E. C.; Fabbrif, R.; Gabbert, D.; Golembiovskaya, M.; Hillenbrand, A.; Hristova, I.; Le, X. -R.; Negodaev, M.; Nowak, W. -D.; Riedl, C.; Schnell, G.; Stewart, J.; Yaschenkof, S.] DESY, D-15738 Zeuthen, Germany.
[Rubin, J.; Shutov, V.] Joint Inst Nucl Res, Dubna 141980, Russia.
[Capiluppi, M.; Ciullo, G.; Contalbrigo, M.; Diefenthaler, M.; Giordano, F.; Pappalardo, L. L.; Ryckbosch, D.; Salomatin, Y.; Stancari, M.; Statera, M.] Univ Ferrara, Ist Nazl Fis Nucl, Sez Ferrara, I-44100 Ferrara, Italy.
[Bianchi, N.; Capitani, G. P.; De Sanctis, E.; Ellinghaus, F.; Fantonij, A.; Hadjidakis, C.; Hasch, D.; Reolon, A. R.] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy.
[De Nardo, L.; Elbakian, G.; Elschenbroichk, U.; Gabbert, D.; Jo, H. S.; Joosten, S.; Schnell, G.; Tytgat, M.; Van Hulse, C.] Univ Ghent, Dept Subat & Radiat Phys, B-9000 Ghent, Belgium.
[Airapetian, A.; Aschenauer, E. C.; Brodsky, I.; Keri, T.; Perez-Benito, R.; Stenzel, H.; Yu, W.] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany.
[Bowles, J.; Burns, J.; Hill, G.; Hoek, M.; Kaiser, R.; Keri, T.; Lehmann, I.; Makins, N. C. R.; Murray, M.; Rosner, G.; Seitz, B.] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland.
[Joosten, S.; Lamb, R.; Manaenkov, S. I.] Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
[Airapetian, A.; Gliske, S.] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA.
[Kozlov, V.; Terkulov, A.] Lebedev Phys Inst, Moscow 117924, Russia.
[Blok, H. P.; Lapikas, L.; Schaefer, A.; Steijger, J. J. M.; van der Nat, P. B.] Natl Inst Subat Phys Nikhef, NL-1009 DB Amsterdam, Netherlands.
[Belostotski, S.; Kisselev, A.; Kravchenko, P.; Manfre, L.; Veretennikov, D.; Vikhrov, V.] Petersburg Nucl Phys Inst, Gatchina 188300, Leningrad Reg, Russia.
[Bryzgalov, V.; Gapienkos, G.; Gapienkos, V.; Lvanilov, A.; Korotkov, V.] Inst High Energy Phys, Moscow 142281, Russia.
Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany.
[Cisbani, E.; Frullani, S.; Garibaldi, F.] Ist Nazl Fis Nucl, Sez Roma 1, Grp Sanita, I-00161 Rome, Italy.
[Cisbani, E.; Garibaldi, F.] Ist Super Sanita, Phys Lab, I-00161 Rome, Italy.
[Felawka, L.; Miller, C. A.; Yen, S.] TRIUMF, Vancouver, BC V6T 2A3, Canada.
[Imazu, Y.; Kobayashi, N.; Ma, B. -Q.; Rostomyan, A.; Shibata, T. -A.] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan.
[Blok, H. P.] Vrije Univ Amsterdam, Dept Phys & Astron, NL-1081 HV Amsterdam, Netherlands.
[Augustyniak, W.; Marianski, B.; Trzcinski, A.; Zupranski, P.] Andrzej Soltan Inst Nucl Studies, PL-00689 Warsaw, Poland.
[Akopovz, N.; Avakian, R.; Avetissian, A.; Gharibyan, V.; Karyan, G.; Marukyan, H.; Movsisyan, A.; Taroian, S.] Yerevan Phys Inst, Yerevan 375036, Armenia.
[Bacchetta, A.] Univ Pavia, Dipartimento Fis Nucl & Teor, I-27100 Pavia, Italy.
[Bacchetta, A.] Ist Nazl Fis Nucl, Sezione Pavia, I-27100 Pavia, Italy.
RP Rith, K (reprint author), Univ Erlangen Nurnberg, Inst Phys, D-91058 Erlangen, Germany.
RI Kozlov, Valentin/M-8000-2015; Terkulov, Adel/M-8581-2015; Cisbani,
Evaristo/C-9249-2011; Bacchetta, Alessandro/F-3199-2012; Deconinck,
Wouter/F-4054-2012; Reimer, Paul/E-2223-2013; Negodaev,
Mikhail/A-7026-2014; Taroian, Sarkis/E-1668-2014
OI Cisbani, Evaristo/0000-0002-6774-8473; Lagamba,
Luigi/0000-0002-0233-9812; Deconinck, Wouter/0000-0003-4033-6716;
Bacchetta, Alessandro/0000-0002-8824-8355;
FU Ministry of Economy; Ministry of Education and Science of Armenia;
FWO-Flanders and IWT, Belgium; Natural Sciences and Engineering Research
Council of Canada; National Natural Science Foundation of China;
Alexander von Humboldt Stiftung; German Bundesministerium fur Bildung
und Forschung (BMBF); Deutsche Forschungsgemeinschaft (DFG); Italian
Istituto Nazionale di Fisica Nucleare (INFN); MEXT; JSPS; G-COE of
Japan; Dutch Foundation; Russian Academy of Science; Russian Federal
Agency for Science and Innovations; U.K. Engineering and Physical
Sciences Research Council; Science and Technology Facilities Council;
Scottish Universities Physics Alliance; U.S. Department of Energy (DOE);
National Science Foundation (NSF); European Community [227431]
FX We gratefully acknowledge the DESY management for its support and the
staff at DESY and the collaborating institutions for their significant
effort. This work was supported by the Ministry of Economy and the
Ministry of Education and Science of Armenia; the FWO-Flanders and IWT,
Belgium; the Natural Sciences and Engineering Research Council of
Canada; the National Natural Science Foundation of China; the Alexander
von Humboldt Stiftung, the German Bundesministerium fur Bildung und
Forschung (BMBF), and the Deutsche Forschungsgemeinschaft (DFG); the
Italian Istituto Nazionale di Fisica Nucleare (INFN); the MEXT, JSPS,
and G-COE of Japan; the Dutch Foundation for Fundamenteel Onderzoek der
Materie (FOM); the Russian Academy of Science and the Russian Federal
Agency for Science and Innovations; the U.K. Engineering and Physical
Sciences Research Council, the Science and Technology Facilities
Council, and the Scottish Universities Physics Alliance; the U.S.
Department of Energy (DOE) and the National Science Foundation (NSF);
and the European Community Research Infrastructure Integrating Activity
under the FP7 "Study of strongly interacting matter (HadronPhysics2,
Grant Agreement number 227431)".
NR 45
TC 110
Z9 110
U1 1
U2 11
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 SEP 20
PY 2010
VL 693
IS 1
BP 11
EP 16
DI 10.1016/j.physletb.2010.08.012
PG 6
WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 654GW
UT WOS:000282157500002
ER
PT J
AU Vivero-Escoto, JL
Slowing, II
Trewyn, BG
Lin, VSY
AF Vivero-Escoto, Juan L.
Slowing, Igor I.
Trewyn, Brian G.
Lin, Victor S. -Y.
TI Mesoporous Silica Nanoparticles for Intracellular Controlled Drug
Delivery
SO SMALL
LA English
DT Review
ID RESPONSIVE CONTROLLED-RELEASE; MESENCHYMAL STEM-CELLS; CANCER-CELLS;
CARBON NANOTUBES; IN-VIVO; POLYSTYRENE MICROSPHERES; SUPRAMOLECULAR
CHEMISTRY; MAGNETIC NANOPARTICLES; MESOSTRUCTURED SILICA; GOLD
NANOPARTICLES
AB The application of nanotechnology in the field of drug delivery has attracted much attention in the latest decades. Recent breakthroughs on the morphology control and surface functionalization of inorganic-based delivery vehicles, such as mesoporous silica nanoparticles (MSNs), have brought new possibilities to this burgeoning area of research. The ability to functionalize the surface of mesoporous-silica-based nanocarriers with stimuli-responsive groups, nanoparticles, polymers, and proteins that work as caps and gatekeepers for controlled release of various cargos is just one of the exciting results reported in the literature that highlights MSNs as a promising platform for various biotechnological and biomedical applications. This review focuses on the most recent progresses in the application of MSNs for intracellular drug delivery. The latest research on the pathways of entry into live mammalian and plant cells together with intracellular trafficking are described. One of the main areas of interest in this field is the development of site-specific drug delivery vehicles; the contribution of MSNs toward this topic is also summarized. In addition, the current research progress on the biocompatibility of this material in vitro and in vivo is discussed. Finally, the latest breakthroughs for intracellular controlled drug release using stimuli-responsive mesoporous-silica-based systems are described.
C1 [Vivero-Escoto, Juan L.] Iowa State Univ, Ames Lab, Dept Chem, Ames, IA 50011 USA.
Iowa State Univ, Ames Lab, US Dept Energy, Ames, IA 50011 USA.
RP Vivero-Escoto, JL (reprint author), Iowa State Univ, Ames Lab, Dept Chem, Ames, IA 50011 USA.
EM jlvivero@email.unc.edu; bgtrewyn@iastate.edu
RI Vivero-Escoto, Juan/I-8015-2014;
OI Slowing, Igor/0000-0002-9319-8639
FU U.S. National Science Foundation [CHE-0809521]; Biopharmaceuticals &
Bioindustrials Initiative of the Plant Science Institute at Iowa State
University
FX The authors thank U.S. National Science Foundation (CHE-0809521), and
Biopharmaceuticals & Bioindustrials Initiative of the Plant Science
Institute at Iowa State University for financial support.
NR 113
TC 470
Z9 477
U1 71
U2 577
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY
SN 1613-6810
J9 SMALL
JI Small
PD SEP 20
PY 2010
VL 6
IS 18
BP 1952
EP 1967
DI 10.1002/smll.200901789
PG 16
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 660SR
UT WOS:000282664800001
PM 20690133
ER
PT J
AU Ashino, T
Sudhahar, V
Urao, N
Oshikawa, J
Chen, GF
Wang, HA
Huo, YQ
Finney, L
Vogt, S
McKinney, RD
Maryon, EB
Kaplan, JH
Ushio-Fukai, M
Fukai, T
AF Ashino, Takashi
Sudhahar, Varadarajan
Urao, Norifumi
Oshikawa, Jin
Chen, Gin-Fu
Wang, Huan
Huo, Yuqing
Finney, Lydia
Vogt, Stefan
McKinney, Ronald D.
Maryon, Edward B.
Kaplan, Jack H.
Ushio-Fukai, Masuko
Fukai, Tohru
TI Unexpected Role of the Copper Transporter ATP7A in PDGF-Induced Vascular
Smooth Muscle Cell Migration
SO CIRCULATION RESEARCH
LA English
DT Article
DE vascular remodeling; vascular smooth muscle; migration; copper
transporter; platelet-derived growth factor
ID SUPEROXIDE DISMUTASE FUNCTION; LYSYL OXIDASE; CARDIOVASCULAR-DISEASE;
NEOINTIMA FORMATION; ARTERIAL INJURY; MENKES-SYNDROME; MEMBRANE;
PROTEIN; PROLIFERATION; TRAFFICKING
AB Rationale: Copper, an essential nutrient, has been implicated in vascular remodeling and atherosclerosis with unknown mechanism. Bioavailability of intracellular copper is regulated not only by the copper importer CTR1 (copper transporter 1) but also by the copper exporter ATP7A (Menkes ATPase), whose function is achieved through copper-dependent translocation from trans-Golgi network (TGN). Platelet-derived growth factor (PDGF) promotes vascular smooth muscle cell (VSMC) migration, a key component of neointimal formation.
Objective: To determine the role of copper transporter ATP7A in PDGF-induced VSMC migration.
Methods and Results: Depletion of ATP7A inhibited VSMC migration in response to PDGF or wound scratch in a CTR1/copper-dependent manner. PDGF stimulation promoted ATP7A translocation from the TGN to lipid rafts, which localized at the leading edge, where it colocalized with PDGF receptor and Rac1, in migrating VSMCs. Mechanistically, ATP7A small interfering RNA or CTR small interfering RNA prevented PDGF-induced Rac1 translocation to the leading edge, thereby inhibiting lamellipodia formation. In addition, ATP7A depletion prevented a PDGF-induced decrease in copper level and secretory copper enzyme precursor prolysyl oxidase (Pro-LOX) in lipid raft fraction, as well as PDGF-induced increase in LOX activity. In vivo, ATP7A expression was markedly increased and copper accumulation was observed by synchrotron-based x-ray fluorescence microscopy at neointimal VSMCs in wire injury model.
Conclusions: These findings suggest that ATP7A plays an important role in copper-dependent PDGF-stimulated VSMC migration via recruiting Rac1 to lipid rafts at the leading edge, as well as regulating LOX activity. This may contribute to neointimal formation after vascular injury. Our findings provide insight into ATP7A as a novel therapeutic target for vascular remodeling and atherosclerosis. (Circ Res. 2010;107:787-799.)
C1 [Fukai, Tohru] Univ Illinois, Dept Med, Cardiol Sect, Cardiovasc Res Ctr, Chicago, IL 60612 USA.
[Ashino, Takashi; Sudhahar, Varadarajan; Chen, Gin-Fu; McKinney, Ronald D.; Fukai, Tohru] Univ Illinois, Dept Pharmacol, Cardiovasc Res Ctr, Chicago, IL 60612 USA.
[Urao, Norifumi; Oshikawa, Jin; McKinney, Ronald D.; Ushio-Fukai, Masuko] Univ Illinois, Dept Pharmacol, Ctr Lung & Vasc Biol, Cardiovasc Res Ctr, Chicago, IL 60612 USA.
[Maryon, Edward B.; Kaplan, Jack H.] Univ Illinois, Dept Biochem & Mol Genet, Chicago, IL USA.
[Finney, Lydia] Univ Minnesota, Dept Med, Minneapolis, MN 55455 USA.
[Finney, Lydia; Vogt, Stefan] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA.
RP Fukai, T (reprint author), Univ Illinois, Dept Med, Cardiol Sect, Cardiovasc Res Ctr, 835 S Wolcott,M-C868,E403 MSB, Chicago, IL 60612 USA.
EM tfukai@uic.edu
RI Vogt, Stefan/B-9547-2009; Vogt, Stefan/J-7937-2013;
OI Vogt, Stefan/0000-0002-8034-5513; Vogt, Stefan/0000-0002-8034-5513;
Kaplan, Jack/0000-0002-7048-6574; Ashino, Takashi/0000-0003-4402-0989
FU NIH [R01 HL070187, R01 HL077524, R01 HL080569-01]; American Heart
Association [09POST2250151, 10GRNT4400005]; Ruth L. Kirschstein-National
Service Research Award [T32]; Uehara Memorial Foundation; Naito
Foundation; American Diabetes Association Research Award [1-10-BS-76];
US Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-06CH11357]
FX This work was supported by NIH grants R01 HL070187 (T.F.), R01 HL077524
(to M.U.-F.), and R01 HL080569-01 (to Y.H.); American Heart Association
Postdoctoral Fellowship 09POST2250151 (to N.U.); Ruth L.
Kirschstein-National Service Research Award (Kirschstein-NRSA) T32
training grant (to G-F.C.); the Uehara Memorial Foundation (to J.O.);
the Naito Foundation (to J.O.); American Diabetes Association Research
Award 1-10-BS-76 (to Y.H.); and American Heart Association Grant
10GRNT4400005 (to Y.H.). Use of the Advanced Photon Source 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 57
TC 34
Z9 34
U1 0
U2 6
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0009-7330
J9 CIRC RES
JI Circ.Res.
PD SEP 17
PY 2010
VL 107
IS 6
BP 787
EP U292
DI 10.1161/CIRCRESAHA.110.225334
PG 33
WC Cardiac & Cardiovascular Systems; Hematology; Peripheral Vascular
Disease
SC Cardiovascular System & Cardiology; Hematology
GA 652ME
UT WOS:000282010000011
PM 20671235
ER
PT J
AU Zhang, Y
Pan, Y
Wang, K
Fast, JD
Grell, GA
AF Zhang, Yang
Pan, Ying
Wang, Kai
Fast, Jerome D.
Grell, Georg A.
TI WRF/Chem-MADRID: Incorporation of an aerosol module into WRF/Chem and
its initial application to the TexAQS2000 episode
SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
LA English
DT Article
ID URBAN OZONE FORMATION; AIR-QUALITY MODELS; SOUTHEAST TEXAS; PARTICULATE
MATTER; PERFORMANCE EVALUATION; INDUSTRIAL EMISSIONS; SPATIAL TRENDS;
NEW-ENGLAND; PM2.5 MASS; HOUSTON
AB The Model of Aerosol Dynamics, Reaction, Ionization and Dissolution (MADRID) with three improved gas/particle mass transfer approaches (i.e., bulk equilibrium (EQUI), hybrid (HYBR), and kinetic (KINE)) has been incorporated into the Weather Research and Forecast/Chemistry Model (WRF/Chem) (referred to as WRF/Chem-MADRID) and evaluated with a 5-day episode from the 2000 Texas Air Quality Study (TexAQS2000). WRF/Chem-MADRID demonstrates an overall good skill in simulating surface/aloft meteorological parameters and chemical concentrations of O-3 and PM2.5, tropospheric O-3 residuals, and aerosol optical depths. The discrepancies can be attributed to inaccuracies in meteorological predictions (e. g., overprediction in mid-day boundary layer height), sensitivity to meteorological schemes used (e. g., boundary layer and land-surface schemes), inaccurate total emissions or their hourly variations (e. g., HCHO, olefins, other inorganic aerosols) or uncounted wildfire emissions, uncertainties in initial and boundary conditions for some species (e. g., other inorganic aerosols, CO, and O-3) at surface and aloft, and some missing/inactivated model treatments for this application (e. g., chlorine chemistry and secondary organic aerosol formation). Major differences in the results among the three gas/particle mass transfer approaches occur over coastal areas, where EQUI predicts higher PM2.5 than HYBR and KINE due to improperly redistributing condensed nitrate from chloride depletion process to fine PM mode. The net direct, semi-direct, and indirect effects of PM2.5 decrease domainwide shortwave radiation by 11.2-14.4 W m(-2) (or 4.1-5.6%) and near-surface temperature by 0.06-0.14 degrees C (or 0.2-0.4%), lead to 125 to 796 cm(-3) cloud condensation nuclei at a supersaturation of 0.1%, produce cloud droplet numbers as high as 2064 cm(-3), and reduce domainwide mean precipitation by 0.22-0.59 mm day(-1).
C1 [Zhang, Yang; Pan, Ying; Wang, Kai] N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27606 USA.
[Fast, Jerome D.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Grell, Georg A.] NOAA, Earth Syst Res Lab, Boulder, CO 80305 USA.
[Grell, Georg A.] Univ Colorado, CIRES, Boulder, CO 80309 USA.
RP Zhang, Y (reprint author), N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Campus Box 8208, Raleigh, NC 27606 USA.
EM yang_zhang@ncsu.edu
RI Pan, Ying/A-3908-2015; grell, georg/B-6234-2015; Wang, Kai/D-4262-2013
OI grell, georg/0000-0001-5214-8742; Wang, Kai/0000-0002-2375-5989
FU National Science Foundation [Atm-0348819]; U.S. Environmental Protection
Agency (EPA) [DW13921548]; U.S. Department of Commerce's National
Oceanic and Atmospheric Administration (NOAA) [DW13921548]; U.S.
EPA-Science to Achieve Results [RD833376]
FX This work was performed at NCSU under the National Science Foundation
Career Award Atm-0348819, the Memorandum of Understanding between the
U.S. Environmental Protection Agency (EPA) and the U.S. Department of
Commerce's National Oceanic and Atmospheric Administration (NOAA) and
under agreement DW13921548, and the U.S. EPA-Science to Achieve Results
(STAR) program (grant RD833376). Thanks are due to Naresh Kumar and
Eladio Knipping, EPRI and Christian Seigneur, formerly at AER and now at
CEREA, France, for permitting the use of original version of MADRID code
for NCSU's further improvement and incorporation into WRF/Chem; Mark Z.
Jacobson, Stanford University, for providing APC and coagulation source
codes for the improvement of MADRID; and Richard C. Easter and Rahul
Zaveri, PNNL, for helpful discussions on MADRID incorporation and the
conversion code from FORTRAN 77/90 fixed format to FORTRAN 90 free
format. Thanks are also due to Xiao-Ming Hu, a former student at NCSU,
for his work on the incorporation of an earlier version of MADRID into
WRF/Chem v2.2 and scripts for post-processing model results. Thanks are
also due to Mark Estes, TCEQ, for providing observational data from
TexAQS2000 collected by TCEQ; Jack Fishman and John K. Creilson, NASA
Langley Research Center, for providing TOR data; D. Allen Chu, NASA
Goddard Space Flight Center, for providing AERONET data at Stennis,
Mississippi and MODIS-derived AOD data; Shao-Cai Yu, the U.S. EPA, for
providing the script for statistical calculation and aircraft data
extraction; Alice Gilliland and Steve Howard, U.S. EPA, for providing
observations from AIRS-AQS and CASTNET; Steven Peckham and Stuart
McKeen, NOAA/ESRL, for helpful discussions on WRF/Chem.
NR 73
TC 24
Z9 24
U1 1
U2 17
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-897X
EI 2169-8996
J9 J GEOPHYS RES-ATMOS
JI J. Geophys. Res.-Atmos.
PD SEP 17
PY 2010
VL 115
AR D18202
DI 10.1029/2009JD013443
PG 32
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 652MW
UT WOS:000282012100004
ER
PT J
AU Alahuhta, M
Xu, Q
Bomble, YJ
Brunecky, R
Adney, WS
Ding, SY
Himmel, ME
Lunin, VV
AF Alahuhta, Markus
Xu, Qi
Bomble, Yannick J.
Brunecky, Roman
Adney, William S.
Ding, Shi-You
Himmel, Michael E.
Lunin, Vladimir V.
TI The Unique Binding Mode of Cellulosomal CBM4 from Clostridium
thermocellum Cellobiohydrolase A
SO JOURNAL OF MOLECULAR BIOLOGY
LA English
DT Article
DE carbohydrate-binding module; CBM4; cellulosome; CbhA; cellulose
degradation
ID MOLECULAR REPLACEMENT; PROTEIN-STRUCTURE; DIELECTRIC MEDIUM; STRUCTURAL
BASIS; GLUCAN-BINDING; FORCE-FIELDS; CORN STOVER; MODULES; FAMILY;
RECOGNITION
AB The crystal structure of the carbohydrate-binding module (CBM) 4 Ig fused domain from the cellulosomal cellulase cellobiohydrolase A (CbhA) of Clostridium thermocellum was solved in complex with cellobiose at 2.11 angstrom resolution. This is the first cellulosomal CBM4 crystal structure reported to date. It is similar to the previously solved noncellulosomal soluble oligosaccharide-binding CBM4 structures. However, this new structure possesses a significant feature-a binding site peptide loop with a tryptophan (Trp118) residing midway in the loop. Based on sequence alignment, this structural feature might be common to all cellulosomal clostridial CBM4 modules. Our results indicate that C. thermocellum CbhA CBM4 also has an extended binding pocket that can optimally bind to cellodextrins containing five or more sugar units. Molecular dynamics simulations and experimental binding studies with the Trp118Ala mutant suggest that Trp118 contributes to the binding and, possibly, the orientation of the module to soluble cellodextrins. Furthermore, the binding cleft aromatic residues Trp68 and Tyr110 play a crucial role in binding to bacterial microcrystalline cellulose (BMCC), amorphous cellulose, and soluble oligodextrins. Binding to BMCC is in disagreement with the structural features of the binding pocket, which does not support binding to the flat surface of crystalline cellulose, suggesting that CBM4 binds the amorphous part or the cellulose "whiskers" of BMCC. We propose that clostridial CBM4s have possibly evolved to bind the free-chain ends of crystalline cellulose in addition to their ability to bind soluble cellodextrins. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Alahuhta, Markus; Xu, Qi; Bomble, Yannick J.; Brunecky, Roman; Adney, William S.; Ding, Shi-You; Himmel, Michael E.; Lunin, Vladimir V.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Lunin, VV (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA.
EM vladimir.lunin@nrel.gov
RI Alahuhta, Markus/E-9344-2012; Ding, Shi-You/O-1209-2013
FU Department of Energy Office of Science, Office of the Biological and
Environmental Research, through the BioEnergy Science Center, a
Department of Energy Bioenergy Research Center; National Science
Foundation [TG-MCB090159]; National Renewable Energy Laboratory
FX This work was supported by the Department of Energy Office of Science,
Office of the Biological and Environmental Research, through the
BioEnergy Science Center, a Department of Energy Bioenergy Research
Center. Computational time for this research was supported, in part, by
the Golden Energy Computing Organization at the Colorado School of Mines
using resources acquired with financial assistance from the National
Science Foundation and the National Renewable Energy Laboratory.
Simulations were also performed, in part, using the Texas Advanced
Computing Center Ranger cluster under National Science Foundation
Teragrid grant TG-MCB090159.
NR 58
TC 14
Z9 14
U1 0
U2 9
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 SEP 17
PY 2010
VL 402
IS 2
BP 374
EP 387
DI 10.1016/j.jmb.2010.07.028
PG 14
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 667QM
UT WOS:000283208700007
PM 20654622
ER
PT J
AU Khare, A
Rasmussen, KO
Samuelsen, MR
Saxena, A
AF Khare, Avinash
Rasmussen, Kim O.
Samuelsen, Mogens R.
Saxena, Avadh
TI Exact solutions of the two-dimensional discrete nonlinear Schrodinger
equation with saturable nonlinearity
SO JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
LA English
DT Article
ID WAVE-GUIDE ARRAYS
AB We show that the two-dimensional, nonlinear Schrodinger lattice with a saturable nonlinearity admits periodic and pulse-like exact solutions. We establish the general formalism for the stability considerations of these solutions and give examples of stability diagrams. Finally, we show that the effective Peierls-Nabarro barrier for the pulse-like soliton solution is zero.
C1 [Khare, Avinash] Inst Phys, Bhubaneswar 751005, Orissa, India.
[Rasmussen, Kim O.; Saxena, Avadh] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Rasmussen, Kim O.; Saxena, Avadh] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA.
[Samuelsen, Mogens R.] Tech Univ Denmark, Dept Phys, DK-2800 Lyngby, Denmark.
RP Khare, A (reprint author), Inst Phys, Bhubaneswar 751005, Orissa, India.
EM kor@lanl.gov
RI Rasmussen, Kim/B-5464-2009; Samuelsen, Mogens/A-2633-2012
OI Rasmussen, Kim/0000-0002-4029-4723;
FU National Nuclear Security Administration of the US Department of Energy
[DE-AC52-06NA25396]
FX This work was carried out 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.
NR 14
TC 3
Z9 3
U1 0
U2 5
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 1751-8113
J9 J PHYS A-MATH THEOR
JI J. Phys. A-Math. Theor.
PD SEP 17
PY 2010
VL 43
IS 37
AR 375209
DI 10.1088/1751-8113/43/37/375209
PG 10
WC Physics, Multidisciplinary; Physics, Mathematical
SC Physics
GA 644OO
UT WOS:000281388800016
ER
PT J
AU Schneebeli, S
Kamenetska, M
Foss, F
Vazquez, H
Skouta, R
Hybertsen, M
Venkataraman, L
Breslow, R
AF Schneebeli, Severin
Kamenetska, Maria
Foss, Frank
Vazquez, Hector
Skouta, Rachid
Hybertsen, Mark
Venkataraman, Latha
Breslow, Ronald
TI The Electrical Properties of Biphenylenes
SO ORGANIC LETTERS
LA English
DT Article
ID MOLECULAR JUNCTIONS; ELECTROPHILIC SUBSTITUTION; AB-INITIO; WIRES;
CONDUCTANCE; POTENTIALS; RESISTANCE; TRANSPORT
AB The effect of the partial antiaromaticity of biphenylene on its substitution chemistry, its oxidation potential, and its single-molecule conductance is explored. Biphenylene and fluorene molecules with linkers of two amino groups or two cyclic thioether groups were synthesized and their conduction properties were investigated using scanning tunneling microscopy (STM) break-junction techniques and OFT calculations. Despite the partial antiaromaticity of biphenylene, which causes the biphenylenes to be much more easily oxidizable, no significant increase in molecular conductance was found.
C1 [Hybertsen, Mark] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
[Schneebeli, Severin; Foss, Frank; Skouta, Rachid; Breslow, Ronald] Columbia Univ, Dept Chem, New York, NY 10027 USA.
[Kamenetska, Maria; Vazquez, Hector; Venkataraman, Latha] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA.
RP Hybertsen, M (reprint author), Brookhaven Natl Lab, Ctr Funct Nanomat, Bldg 735, Upton, NY 11973 USA.
EM mhyberts@bnl.gov; lv2117@columbia.edu; rb33@columbia.edu
RI Foss, Frank/A-3318-2009; Schneebeli, Severin/D-7898-2013; Vazquez,
Hector/G-5788-2014; Skouta, Rachid/Q-7132-2016;
OI Foss, Frank/0000-0003-1940-6580; Vazquez, Hector/0000-0002-3865-9922;
Hybertsen, Mark S/0000-0003-3596-9754; Venkataraman,
Latha/0000-0002-6957-6089
FU Nanoscale Science and Engineering Initiative of the NSF [CHE-0641523];
New York State Office of Science, Technology; Packard Foundation; U.S.
Department of Energy, Office of Basic Energy Sciences
[DE-AC02-98CH10886]
FX This work was supported in part by the Nanoscale Science and Engineering
Initiative of the NSF (Award CHE-0641523) and the New York State Office
of Science, Technology. L.V. thanks the Packard Foundation for support.
This work was supported in part by the U.S. Department of Energy, Office
of Basic Energy Sciences, under Contract No. DE-AC02-98CH10886 (M.S.H.).
NR 29
TC 11
Z9 11
U1 1
U2 26
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1523-7060
J9 ORG LETT
JI Org. Lett.
PD SEP 17
PY 2010
VL 12
IS 18
BP 4114
EP 4117
DI 10.1021/ol1017036
PG 4
WC Chemistry, Organic
SC Chemistry
GA 647DP
UT WOS:000281596800039
PM 20722383
ER
PT J
AU Dracoulis, GD
Lane, GJ
Hughes, RO
Kondev, FG
Watanabe, H
Seweryniak, D
Zhu, S
Carpenter, MP
Chiara, CJ
Janssens, RVF
Lauritsen, T
Lister, CJ
McCutchan, EA
Stefanescu, I
Chowdhury, P
AF Dracoulis, G. D.
Lane, G. J.
Hughes, R. O.
Kondev, F. G.
Watanabe, H.
Seweryniak, D.
Zhu, S.
Carpenter, M. P.
Chiara, C. J.
Janssens, R. V. F.
Lauritsen, T.
Lister, C. J.
McCutchan, E. A.
Stefanescu, I.
Chowdhury, P.
TI Structure of three-quasiparticle isomers in Ho-169 and Tm-171
SO PHYSICAL REVIEW C
LA English
DT Article
ID QUASI-PARTICLE STATES; ISOTOPES; BANDS
AB A three-quasiparticle isomer with tau = 170(8) mu s and K-pi = (19/2(+)) has been identified in the neutron-rich isotope Ho-169. The isomer decays with K-forbidden transitions to members of a band associated with the 7/2(-)[523] proton configuration, whose structure is characterized through analysis of the in-band gamma-ray branching ratios. In the isotone Tm-171, the rotational band based on the known 19/2(+), three-quasiparticle isomer has also been observed. Alternative one-proton two-neutron configurations for the isomer in Ho-169 are discussed in terms of multiquasiparticle calculations and through a comparison with the structures observed in Tm-171.
C1 [Dracoulis, G. D.; Lane, G. J.; Hughes, R. O.] Australian Natl Univ, Dept Nucl Phys, RSPE, Canberra, ACT 0200, Australia.
[Kondev, F. G.; Chiara, C. J.] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA.
[Watanabe, H.] RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan.
[Seweryniak, D.; Zhu, S.; Carpenter, M. P.; Janssens, R. V. F.; Lauritsen, T.; Lister, C. J.; McCutchan, E. A.; Stefanescu, I.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
[Stefanescu, I.] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA.
[Chowdhury, P.] Univ Massachusetts Lowell, Dept Phys, Lowell, MA 01854 USA.
RP Dracoulis, GD (reprint author), Australian Natl Univ, Dept Nucl Phys, RSPE, GPO Box 4, Canberra, ACT 0200, Australia.
EM george.dracoulis@anu.edu.au
RI Lane, Gregory/A-7570-2011; Carpenter, Michael/E-4287-2015
OI Lane, Gregory/0000-0003-2244-182X; Carpenter,
Michael/0000-0002-3237-5734
FU Australian Research Council [DP0986725]; US Department of Energy, Office
of Nuclear Physics [DE-AC02-06CH11357, DE-FG02-94ER40848]
FX The authors thank R. B. Turkentine for producing the target and the
staff of the ATLAS accelerator facility for their assistance in various
phases of the experiment. This work is supported by the Australian
Research Council Discovery program (DP0986725) and the US Department of
Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357
and Grant No. DE-FG02-94ER40848.
NR 23
TC 6
Z9 7
U1 0
U2 0
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 SEP 17
PY 2010
VL 82
IS 3
AR 034317
DI 10.1103/PhysRevC.82.034317
PG 6
WC Physics, Nuclear
SC Physics
GA 652MP
UT WOS:000282011400001
ER
PT J
AU Gibson, JM
Treacy, MMJ
Sun, T
Zaluzec, NJ
AF Gibson, J. M.
Treacy, M. M. J.
Sun, T.
Zaluzec, N. J.
TI Substantial Crystalline Topology in Amorphous Silicon
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID MEDIUM-RANGE ORDER; FLUCTUATION MICROSCOPY; DISORDERED MATERIALS;
THIN-FILMS; SCATTERING; PROBE
AB Using electron correlograph analysis we show that coherent nanodiffraction patterns from sputtered amorphous silicon indicate that there is more local crystallinity in unannealed amorphous silicon than was previously suspected. By comparing with simulations for various models we show that within a typical unannealed amorphous silicon film a substantial volume fraction (> 50%) is topologically crystalline with correlation lengths up to 2 nm. Electron correlograph analysis is a variant of the fluctuation electron microscopy technique and its sensitivity to local crystalline ordering is derived from its sensitivity to four-body correlations.
C1 [Gibson, J. M.; Sun, T.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[Treacy, M. M. J.] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA.
[Treacy, M. M. J.] Univ Oxford, Dept Mat, Oxford OX1 3PH, England.
[Zaluzec, N. J.] Argonne Natl Lab, Div Mat Sci, Ctr Electron Microscopy, Argonne, IL 60439 USA.
RP Gibson, JM (reprint author), Argonne Natl Lab, Adv Photon Source, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM treacy@asu.edu
RI Gibson, Murray/E-5855-2013
OI Gibson, Murray/0000-0002-0807-6224
FU Leverhulme Trust; Advanced Photon Source, and the Electron Microscopy
Center, at Argonne National Laboratory, U. S. Department of Energy
[DE-AC02-06CH11357]
FX M. M. J. T is grateful for support from the Leverhulme Trust. We
acknowledge support from the Advanced Photon Source, and the Electron
Microscopy Center, at Argonne National Laboratory, U. S. Department of
Energy, Contract No. DE-AC02-06CH11357. We thank J. R. Abelson and B. S.
Lee of the University of Illinois, Urbana-Champaign, for providing the
samples.
NR 24
TC 36
Z9 36
U1 6
U2 31
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 SEP 17
PY 2010
VL 105
IS 12
AR 125504
DI 10.1103/PhysRevLett.105.125504
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653ZW
UT WOS:000282138900012
PM 20867656
ER
PT J
AU Sun, CM
Pager, CT
Luo, GX
Sarnow, P
Cate, JHD
AF Sun, Chaomin
Pager, Cara T.
Luo, Guangxiang
Sarnow, Peter
Cate, Jamie H. D.
TI Hepatitis C Virus Core-Derived Peptides Inhibit Genotype 1b Viral Genome
Replication via Interaction with DDX3X
SO PLOS ONE
LA English
DT Article
ID BOX RNA HELICASE; CANDIDATE TUMOR-SUPPRESSOR; HEPATOCELLULAR-CARCINOMA;
PROTEIN INTERACTS; TRANSLATION; REQUIREMENT; TARGETS; EIF4E
AB The protein DDX3X is a DEAD-box RNA helicase that is essential for the hepatitis C virus (HCV) life cycle. The HCV core protein has been shown to bind to DDX3X both in vitro and in vivo. However, the specific interactions between these two proteins and the functional importance of these interactions for the HCV viral life cycle remain unclear. We show that amino acids 16-36 near the N-terminus of the HCV core protein interact specifically with DDX3X both in vitro and in vivo. Replication of HCV replicon NNeo/C-5B RNA (genotype 1b) is significantly suppressed in HuH-7-derived cells expressing green fluorescent protein (GFP) fusions to HCV core protein residues 16-36, but not by GFP fusions to core protein residues 16-35 or 16-34. Notably, the inhibition of HCV replication due to expression of the GFP fusion to HCV core protein residues 16-36 can be reversed by overexpression of DDX3X. These results suggest that the protein interface on DDX3X that binds the HCV core protein is important for replicon maintenance. However, infection of HuH-7 cells by HCV viruses of genotype 2a (JFH1) was not affected by expression of the GFP fusion protein. These results suggest that the role of DDX3X in HCV infection involves aspects of the viral life cycle that vary in importance between HCV genotypes.
C1 [Sun, Chaomin] Univ Calif Berkeley, Calif Inst Quantitat Biosci, Berkeley, CA 94720 USA.
[Pager, Cara T.; Sarnow, Peter] Stanford Univ, Dept Microbiol & Immunol, Sch Med, Stanford, CA 94305 USA.
[Luo, Guangxiang] Univ Kentucky, Dept Microbiol Immunol & Mol Genet, Lexington, KY USA.
[Cate, Jamie H. D.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Cate, Jamie H. D.] Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA.
[Cate, Jamie H. D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
RP Sun, CM (reprint author), Univ Calif Berkeley, Calif Inst Quantitat Biosci, Berkeley, CA 94720 USA.
FU National Institutes of Health (NIH) [GM073732]; Damon Runyon Cancer
Research Foundation [DRG1954-07]
FX This work was supported by National Institutes of Health (NIH) grant
GM073732 to J.H.D.C. and P. S. (www.nih.gov). C.T.P. is supported by the
Damon Runyon Cancer Research Foundation (DRG1954-07,
http://www.damonrunyon.org/). The funders had no role in study design,
data collection and analysis, decision to publish, or preparation of the
manuscript.
NR 37
TC 10
Z9 10
U1 0
U2 8
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 SEP 17
PY 2010
VL 5
IS 9
AR e12826
DI 10.1371/journal.pone.0012826
PG 10
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 651XL
UT WOS:000281960800021
ER
PT J
AU Riihimaki, LD
McFarlane, SA
AF Riihimaki, L. D.
McFarlane, S. A.
TI Frequency and morphology of tropical tropopause layer cirrus from
CALIPSO observations: Are isolated cirrus different from those connected
to deep convection?
SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
LA English
DT Article
ID RADIATIVE IMPACTS; EL-NINO; CLOUDS; THIN; LIDAR; DEPOLARIZATION
AB Tropical tropopause layer cirrus (TTLC) profiles identified from CALIPSO lidar measurements are grouped into cloud objects and classified according to whether or not they are directly connected to deep convection. TTLC objects directly connected to deep convection are optically and physically thicker than isolated objects, consistent with what would be expected if convective objects were formed from convective detrainment and isolated objects formed in situ. The frequency of occurrence of these different classifications of TTLC varies depending on height and region. Thirty- six percent of TTLC profiles contain convective TTLC when TTLC is defined with cloud base height greater than 14 km (+/- 20 degrees Latitude). This estimate of convective TTLC is thought to be a lower limit on the percentage of TTLC formed by convective detrainment. Aged anvil that has persisted longer than the thick regions of the convective cloud would not be classified as convective in our classification. Regions with higher occurrence of deep convection also have higher occurrence of TTLC, and a greater percentage of those TTLC are classified as convective. Definitions of TTLC using higher cloud base height thresholds contain a smaller percentage of TTLC that are classified as convective. Cloud top heights of both isolated and convective TTLC are distributed similarly with respect to the height of the cold point tropopause. Cloud optical depths were found to be higher in TTLC over thick clouds than in TTLC over clear sky during the day but not in night measurements. It is not clear whether this has a physical cause or is due to daytime measurement uncertainties. Both cloud base and top heights are higher over deep convection than over clear sky.
C1 [Riihimaki, L. D.; McFarlane, S. A.] Pacific NW Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA.
RP Riihimaki, LD (reprint author), Pacific NW Natl Lab, Atmospher Sci & Global Change Div, POB 999, Richland, WA 99352 USA.
EM laura.riihimaki@pnl.gov
RI McFarlane, Sally/C-3944-2008
FU NASA
FX The authors thank Jennifer Comstock for helpful discussions regarding
lidar measurements, Nat Beagley and Amanda White for developing the code
used to process the CERES SSF data, and anonymous reviewers whose
comments improved the manuscript. This research was funded by the NASA
New Investigator Program. CALIPSO and CERES SSF data were obtained from
the NASA Langley Research Center Atmospheric Science Data Center.
CloudSat ECMWF-AUX data were obtained from the CloudSat Data Processing
Center. Pacific Northwest National Laboratory is operated by Battelle
for the US Department of Energy.
NR 37
TC 12
Z9 12
U1 0
U2 5
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-897X
EI 2169-8996
J9 J GEOPHYS RES-ATMOS
JI J. Geophys. Res.-Atmos.
PD SEP 16
PY 2010
VL 115
AR D18201
DI 10.1029/2009JD013133
PG 12
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 652MR
UT WOS:000282011600002
ER
PT J
AU Torres, B
Cachorro, VE
Toledano, C
de Galisteo, JPO
Berjon, A
de Frutos, AM
Bennouna, Y
Laulainen, N
AF Torres, B.
Cachorro, V. E.
Toledano, C.
Ortiz de Galisteo, J. P.
Berjon, A.
de Frutos, A. M.
Bennouna, Y.
Laulainen, N.
TI Precipitable water vapor characterization in the Gulf of Cadiz region
(southwestern Spain) based on Sun photometer, GPS, and radiosonde data
SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
LA English
DT Article
ID SOLAR TRANSMITTANCE MEASUREMENTS; AEROSOL OPTICAL DEPTH; RETRIEVALS;
ABSORPTION; CLIMATOLOGY; RADIOMETER; AERONET; METEOROLOGY; HUMIDITY;
LIDAR
AB Total precipitable water vapor (PWV) is characterized for the first time over southwestern Europe by means of ground-based measurements during the period 2001-2005. Existing data from three sites located in the Cadiz Gulf region, El Arenosillo, San Fernando, and Gibraltar, using three different techniques, Sun photometer (SP), GPS, and radiosondes, are used for the analysis. The 5 year data series gives a mean value of about 2 cm (SD = 0.7 cm) and a clear seasonal pattern. In the multiannual monthly means basis, the highest values are reached in August-September, with a mean value of 2.5-2.6 cm, whereas the lowest are obtained in January-February, with an average of 1.4-1.5 cm. The data in the three sites have been compared in order to assess regional variability. Differences could be due to real local variability but also could arise from the differences in the measurement techniques. From daily to monthly bases, water vapor behavior is similar in the three sites, with the largest differences ranging from 3% in summer to 14% in winter. Outstanding results from these analyses are the observed local minimum in July, occurring during the maximum of desert dust intrusions in the southern Iberian Peninsula, and the significant differences found between the El Arenosillo (SP) and San Fernando (GPS) measurements, related to the periodical replacement of the SP instrument at El Arenosillo. The observed differences highlight the importance of drift in each SP because of filter aging or other calibration problems. Finally, the Moderate Resolution Imaging Spectroradiometer (MODIS) near-infrared water vapor product has been compared to the data from the GPS station (San Fernando). MODIS retrieval slightly overestimates PWV in summer (5%-8%) and significantly underestimates in winter (-23%).
C1 [Torres, B.; Cachorro, V. E.; Toledano, C.; Ortiz de Galisteo, J. P.; Berjon, A.; de Frutos, A. M.; Bennouna, Y.] Univ Valladolid, Grp Atmospher Opt, ES-47071 Valladolid, Spain.
[Ortiz de Galisteo, J. P.] Spanish Meteorol Agcy, Valladolid, Spain.
[Laulainen, N.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Torres, B (reprint author), Univ Valladolid, Grp Atmospher Opt, Prado Magdalena S-N, ES-47071 Valladolid, Spain.
EM chiqui@baraja.opt.cie.uva.es
RI Toledano, Carlos/J-3672-2012; Ortiz-de-Galisteo, Jose Pablo/O-4607-2014;
Berjon, Alberto/M-4203-2015;
OI Toledano, Carlos/0000-0002-6890-6648; Ortiz-de-Galisteo, Jose
Pablo/0000-0001-6649-8970; Berjon, Alberto/0000-0002-4508-7037;
Cachorro, Victoria/0000-0002-4627-9444
FU CICYT [CGL2005-05693-C03/CLI, CGL2008-05939-C03-01/CLI]; Junta de
Castilla y Leon [GR220]; Office of Science, U.S. Department of Energy
(DOE) [DE-AC06-76RLO 1830]
FX The authors gratefully acknowledge the AERONET and PHOTONS teams for
their technical support and advice and the staff at San Fernando and
Gibraltar stations. Special thanks are due to the people of INTA-El
Arenosillo for the maintenance of the Cimel Sun photometer. This work
was funded by CICYT under projects CGL2005-05693-C03/CLI and
CGL2008-05939-C03-01/CLI and by Junta de Castilla y Leon under reference
GR220. This work was also supported (N.L.) by the Office of Science,
U.S. Department of Energy (DOE), under contract DE-AC06-76RLO 1830.
Pacific Northwest Laboratory is operated for the DOE by Battelle
Memorial Institute.
NR 56
TC 8
Z9 8
U1 0
U2 5
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 SEP 16
PY 2010
VL 115
AR D18103
DI 10.1029/2009JD012724
PG 11
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 652MR
UT WOS:000282011600001
ER
PT J
AU Wang, JH
Domin, D
Austin, B
Zubarev, DY
McClean, J
Frenklach, M
Cui, TA
Lester, WA
AF Wang, Jinhua
Domin, Dominik
Austin, Brian
Zubarev, Dmitry Yu
McClean, Jarrod
Frenklach, Michael
Cui, Tian
Lester, William A., Jr.
TI A Diffusion Monte Carlo Study of the O-H Bond Dissociation of Phenol
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID COUPLED-CLUSTER CALCULATIONS; DENSITY-FUNCTIONAL THEORY; AB-INITIO
CALCULATIONS; HOMOLYTIC DISSOCIATION; THERMAL-DECOMPOSITION; SUBSTITUTED
PHENOLS; PROTON-TRANSFER; HARTREE-FOCK; ENTHALPY; RADICALS
AB The homolytic O-H bond dissociation energy (BDE) of phenol was determined from diffusion Monte Carlo (DMC) calculations using single determinant trial wave functions. DMC gives an O-H BDE of 87.0 +/- 0.3 kcal/mol when restricted Hartree-Fock orbitals are used and a BDE of 87.5 +/- 0.3 kcal/mol with restricted B3LYP Kohn-Sham orbitals. These results are in good agreement with the extrapolated B3P86 results of Costa Cabral and Canuto (88.3 kcal/mol), the recommended experimental value of Borges dos Santos and Martinho Simoes (88.7 +/- 0.5 kcal/mol), and the G3 (88.2 kcal/mol), CBS-APNO (88.2 kcal/mol), CBS-QB3 (87.1 kcal/mol) results of Mulder.
C1 [Wang, Jinhua; Domin, Dominik; Austin, Brian; Zubarev, Dmitry Yu; McClean, Jarrod; Lester, William A., Jr.] Univ Calif Berkeley, Dept Chem, Kenneth S Pitzer Ctr Theoret Chem, Berkeley, CA 94720 USA.
[Wang, Jinhua; Cui, Tian] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China.
[Domin, Dominik; Austin, Brian; Lester, William A., Jr.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA.
[Frenklach, Michael] Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA.
[Frenklach, Michael] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA.
RP Lester, WA (reprint author), Univ Calif Berkeley, Dept Chem, Kenneth S Pitzer Ctr Theoret Chem, Berkeley, CA 94720 USA.
EM walester@lbl.gov
FU Office of Energy Research, Office of Basic Energy Sciences, Chemical
Sciences, 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]; National Basic Research Program of China
[2005CB724400]; Office of Science of the US Department of Energy
[DE-AC02-05CH11231]
FX B.A., D.D., W.A.L., and M.F. were supported by the Director, Office of
Energy Research, Office of Basic Energy Sciences, Chemical Sciences,
Geosciences and Biosciences Division of the US Department of Energy,
under Contract No. DE-AC03-76F00098. M.F. was 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 NSF CHE-0809969. J.W. and T.C. were
supported by the National Basic Research Program of China, Grant No.
2005CB724400. This research used computational resources of the National
Energy Research Scientific Computing Center, which is supported by the
Office of Science of the US Department of Energy under Contract No.
DE-AC02-05CH11231.
NR 52
TC 9
Z9 9
U1 2
U2 21
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 SEP 16
PY 2010
VL 114
IS 36
BP 9832
EP 9835
DI 10.1021/jp103010g
PG 4
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 646UC
UT WOS:000281567500031
PM 20825240
ER
PT J
AU Xu, ZH
Tsai, HH
Wang, HL
Cotlet, M
AF Xu, Zhihua
Tsai, Hsinhan
Wang, Hsing-Lin
Cotlet, Mircea
TI Solvent Polarity Effect on Chain Conformation, Film Morphology, and
Optical Properties of a Water-Soluble Conjugated Polymer
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID LIGHT-EMITTING-DIODES; FLUORESCENCE CORRELATION SPECTROSCOPY; INTERCHAIN
INTERACTIONS; ENERGY-TRANSFER; ELECTRON INJECTION; COLLAPSED COILS;
SOLAR-CELLS; POLYELECTROLYTES; DERIVATIVES; DEPENDENCE
AB The solvent polarity effect on chain conformation, film morphology, and photophysical properties of a nonionic water-soluble conjugated polymer (WSCP), poly[2,5-bis(diethylaminetetraethylene glycol)phenylene vinylene] (DEATG-PPV) is investigated in detail. The combination of stationary absorption and photoluminescence (PL) spectroscopy, time-resolved PL spectroscopy, and fluorescence correlation spectroscopy methods enables us to probe the chain conformation of DEATG-PPV, down to the level of a single chain when working with extremely diluted solutions. The use of correlated atomic force microscopy and confocal fluorescence lifetime imaging microscopy measurements of drop-casted DEATG-PPV films reveals the intrinsic relationship between chain conformation, film morphology, and optical properties. Depending on solvent polarity, DEATG-PPV presents extended, coiled, and collapsed chain conformations in solutions, which lead to distinct morphology and optical properties in solid films. Our work presents a pathway to control and characterize the film morphologies of WSCPs toward the optimal performance of various optoelectronic devices.
C1 [Tsai, Hsinhan; Wang, Hsing-Lin] Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA.
[Xu, Zhihua; Cotlet, Mircea] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
RP Wang, HL (reprint author), Los Alamos Natl Lab, Div Chem, POB 1663, Los Alamos, NM 87545 USA.
EM hwang@lanl.gov; cotlet@bnl.gov
FU U.S. Department of Energy, Office of Basic Energy Sciences
[DE-AC02-98CH10886]
FX Research was carried out at the Center for Functional Nanomaterials,
Brookhaven National Laboratory (BNL), which is supported by the U.S.
Department of Energy, Office of Basic Energy Sciences, under Contract
No. DE-AC02-98CH10886 (MC. with user H.-L.W.). We thank Dr. D.
Nkypanchuk and Mr. S. Baker from BNL for help with the integration of
the AFM and FLIM experiments at BNL.
NR 44
TC 16
Z9 16
U1 2
U2 33
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 SEP 16
PY 2010
VL 114
IS 36
BP 11746
EP 11752
DI 10.1021/jp105032y
PG 7
WC Chemistry, Physical
SC Chemistry
GA 644TP
UT WOS:000281404500008
PM 20726542
ER
PT J
AU Peng, LJ
Morris, JR
AF Peng, Lujian
Morris, James R.
TI Prediction of Hydrogen Adsorption Properties in Expanded Graphite Model
and in Nanoporous Carbon
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID ACTIVATED CARBONS; STORAGE CAPACITY; MOLECULAR-DYNAMICS; SURFACE-AREA;
NANOTUBES; NANOSTRUCTURES; NANOFIBERS; TEMPERATURES; FUGACITY
AB This paper calculates that the theoretical hydrogen uptake in nanoporous carbons is close to 0.5 wt % at 298 K and 5 MPa, higher than most reported values in activated carbons. The isosteric heats of adsorption for nanoporous carbons and for an expanded graphite model are between 14 and 18 kJ/mol, close to the suitable energy range for practical hydrogen storage (15-40 kJ/mol). Over the density ranges examined, total hydrogen adsorption can be improved by increasing the volume available for adsorption in amorphous carbons. These calculations are performed by using an efficient and accurate method. This method can reproduce previous, more computational intensive calculations in the expanded graphite model yet is readily applicable to more complex geometries. The limitations of this method are discussed carefully; under conditions given above, these limitations are minimal.
C1 [Morris, James R.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Peng, Lujian; Morris, James R.] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
RP Morris, JR (reprint author), Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
RI Morris, J/I-4452-2012
OI Morris, J/0000-0002-8464-9047
FU Materials Sciences and Engineering Division, Office of Basic Energy
Sciences, U.S. Department of Energy; Office of Science of the U.S.
Department of Energy
FX We greatly appreciate helpful comments from C. I. Contescu, N. C.
Gallego, V. R. Cooper, and T. Egami. This research is sponsored by the
Materials Sciences and Engineering Division, Office of Basic Energy
Sciences, U.S. Department of Energy. This research used resources of the
National Energy Research Scientific Computing Center, which is supported
by the Office of Science of the U.S. Department of Energy.
NR 37
TC 19
Z9 20
U1 0
U2 14
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 SEP 16
PY 2010
VL 114
IS 36
BP 15522
EP 15529
DI 10.1021/jp104595m
PG 8
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 644TQ
UT WOS:000281404600039
ER
PT J
AU Mei, DH
Kwak, JH
Hu, JZ
Cho, SJ
Szanyi, J
Allard, LF
Peden, CHF
AF Mei, Donghai
Kwak, Ja Hun
Hu, Jianzhi
Cho, Sung June
Szanyi, Janos
Allard, Lawrence F.
Peden, Charles H. F.
TI Unique Role of Anchoring Penta-Coordinated Al3+ Sites in the Sintering
of gamma-Al2O3-Supported Pt Catalysts
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID SUPPORTED-METAL-CATALYSTS; THERMAL-EXPANSION; PLATINUM; CLUSTERS; MODEL;
EXAFS; IONS; SIZE
AB gamma-Al2O3-supported Pt group catalysts are widely used in many industrially important catalytic processes. However, gamma-Al2O3-supported Pt catalysts are prone to deactivation via metal sintering at high temperatures, in oxidative reaction environments, or both. Using a combination of experimental HRTEM and EXAFS measurements and theoretical DFT calculations, we find that pentacoordinated Al3+ sites (Al-p) on the gamma-Al2O3(100) surface can inhibit Pt sintering both thermodynamically and kinetically because of their strong interactions with atomic Pt or Pt oxide species. The present work suggests a promising approach for stabilizing the size and morphology of supported catalytically active phases,
C1 [Mei, Donghai; Kwak, Ja Hun; Hu, Jianzhi; Szanyi, Janos; Peden, Charles H. F.] Pacific NW Natl Lab, Inst Interfacial Catalysis, Richland, WA 99352 USA.
[Cho, Sung June] Chonnam Natl Univ, Dept Appl Chem Engn, Kwanju, South Korea.
[Allard, Lawrence F.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
RP Mei, DH (reprint author), Pacific NW Natl Lab, Inst Interfacial Catalysis, Richland, WA 99352 USA.
EM donghai.mei@pnl.gov; kwak@pnl.gov; chuck.peden@pnl.gov
RI Mei, Donghai/D-3251-2011; Hu, Jian Zhi/F-7126-2012; Mei,
Donghai/A-2115-2012; Kwak, Ja Hun/J-4894-2014;
OI Mei, Donghai/0000-0002-0286-4182; Peden, Charles/0000-0001-6754-9928
FU U.S. Department of Energy, Office of Basic Energy Sciences; Pacific
Northwest National Laboratory; Brookhaven National Laboratory
[DE-AC02-98CH10886]
FX This work was supported by the U.S. Department of Energy, Office of
Basic Energy Sciences and by an LDRD project at Pacific Northwest
National Laboratory. Sample preparation and NMR experiments were
performed in the Environmental Molecular Sciences Laboratory (EMSL).
HR-STEM images were acquired at the High Temperature Materials
Laboratory at ORNL. EXAFS data were collected using the National
Synchrotron Light Source at Brookhaven National Laboratory under
contract no. DE-AC02-98CH10886. Computing time was granted by the
National Energy Research Scientific Computing Center and EMSL (st30469).
NR 24
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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 SEP 16
PY 2010
VL 1
IS 18
BP 2688
EP 2691
DI 10.1021/jz101073p
PG 4
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 652OO
UT WOS:000282017400014
ER
PT J
AU Wang, Y
DePrince, AE
Gray, SK
Lin, XM
Pelton, M
AF Wang, Yiliang
DePrince, A. Eugene, III
Gray, Stephen K.
Lin, Xiao-Min
Pelton, Matthew
TI Solvent-Mediated End-to-End Assembly of Gold Nanorods
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID AU NANORODS; GROWTH; MONOLAYERS; MECHANISM; SURFACE; SILVER
AB We demonstrate a new method for the bottom-up assembly of anisotropic nanoparticles, showing that alkanethiol molecules can induce controlled end-to-end assembly of gold nanorods in mixed water/acetonitrile solutions. The assembly is driven by solvent-mediated interactions among hydrophobic alkanethiol ligands selectively bound to the ends of the nanorods and among hydrophilic cetyltrimethylammonium bromide (CTAB) surfactants on the sides of the rods. It occurs only when the gold-nanorod samples have been aged for approximately two weeks. We compare the kinetics of solvent-mediated assembly using undecanethiol ligands to assembly processes driven by covalent bonding using alpha,omega-undecanedithiol ligands and processes driven by hydrogen bonding using 11-mercaptoundecanoic acid ligands. Our experiments demonstrate the different assembly mechanisms involved as well as the conditions needed to obtain selective end-to-end assembly.
C1 [Wang, Yiliang; DePrince, A. Eugene, III; Gray, Stephen K.; Lin, Xiao-Min; Pelton, Matthew] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
RP Lin, XM (reprint author), Argonne Natl Lab, Ctr Nanoscale Mat, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM xmlin@anl.gov; pelton@anl.gov
RI Pelton, Matthew/H-7482-2013
OI Pelton, Matthew/0000-0002-6370-8765
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-06CH11357]
FX Work at the Center for Nanoscale Materials was supported by the U.S.
Department of Energy, Office of Science, Office of Basic Energy
Sciences, under Contract No. DE-AC02-06CH11357. Transmission electron
microscopy was performed at the Electron Microscopy Center for Materials
Research at Argonne National Laboratory.
NR 30
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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 SEP 16
PY 2010
VL 1
IS 18
BP 2692
EP 2698
DI 10.1021/jz1010048
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 652OO
UT WOS:000282017400015
ER
PT J
AU Fernandez-Alberti, S
Kleiman, VD
Tretiak, S
Roitberg, AE
AF Fernandez-Alberti, S.
Kleiman, Valeria D.
Tretiak, S.
Roitberg, Adrian E.
TI Unidirectional Energy Transfer in Conjugated Molecules: The Crucial Role
of High-Frequency C C Bonds
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID CORRELATED EXCIMER FORMATION; PHENYLACETYLENE DENDRIMERS;
OPTICAL-EXCITATIONS; PHOTOEXCITED POLYFLUORENES; ELECTRONIC EXCITATIONS;
ANTENNA SUPERMOLECULES; GAUSSIAN WAVEPACKETS; DYNAMICS SIMULATIONS;
NANOSCALE SYSTEMS; MMVB DYNAMICS
AB Excited-state nonadiabatic molecular dynamics is used to study energy transfer in dendrimer building blocks, between two-, three-, and four-ring linear polyphenylene ethynylene units linked by meta-substitutions. Upon excitation, dendrimers with these building blocks have been shown to undergo highly efficient and unidirectional energy transfer. The simulations start by initial vertical excitation to the S-4, localized on the two-ring unit. We observe ultrafast directional S-4 -> S-3 -> S-2 -> S-1 electronic energy transfer, corresponding to sequential two-ring three-ring four-ring transfer. The electronic energy transfer is concomitant with vibrational energy transfer through a dominant C C stretching motion. Upon Sn+1 -> S-n population transfer, a rapid increase of the Sn+1 -> S-n energy gaps and decrease of the corresponding values for S-n-Sn-1 gaps are observed. As a consequence, the Sn+1 and S-n states become less coupled, while the S-n and Sn-1 become more coupled. This behavior guarantees,the successful Sn+1 -> S-n -> Sn-1 unidirectional energy transfer associated with the efficient energy funneling in light-harvesting dendrimers.
C1 [Roitberg, Adrian E.] Univ Florida, Dept Chem, Quantum Theory Project, Gainesville, FL 32611 USA.
[Fernandez-Alberti, S.] Univ Nacl Quilmes, Bernal, Argentina.
[Kleiman, Valeria D.] Univ Florida, Dept Chem, Gainesville, FL 32611 USA.
[Kleiman, Valeria D.] Univ Florida, Ctr Chem Phys, Gainesville, FL 32611 USA.
[Tretiak, S.] Los Alamos Natl Lab, Div Theoret, CNLS, Los Alamos, NM 87545 USA.
[Tretiak, S.] Los Alamos Natl Lab, CINT, Los Alamos, NM 87545 USA.
RP Roitberg, AE (reprint author), Univ Florida, Dept Chem, Quantum Theory Project, Gainesville, FL 32611 USA.
RI Roitberg, Adrian/A-2378-2009; Tretiak, Sergei/B-5556-2009; Kleiman,
Valeria/H-7818-2013
OI Tretiak, Sergei/0000-0001-5547-3647; Kleiman,
Valeria/0000-0002-9975-6558
FU CONICET; UNQ; NSF [CHE-0239120]; Center for Integrated Nanotechnologies;
U.S. Department of Energy, Office of Basic Energy Sciences; Center for
Nonlinear Studies (CNLS) at LANL; UF's High-Performance Computing
Center; NSF Large Allocations Resource Committee [MCA05S010,
UT-NTNL0002]
FX This work was partially supported by CONICET, UNQ, NSF Grant
CHE-0239120, and the Center for Integrated Nanotechnologies, a U.S.
Department of Energy, Office of Basic Energy Sciences user facility. We
also acknowledge support of the Center for Nonlinear Studies (CNLS) at
LANL. We acknowledge UF's High-Performance Computing Center and NSF
Large Allocations Resource Committee through Grants TG-MCA05S010 and
UT-NTNL0002 for providing computational resources.
NR 66
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U2 30
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 SEP 16
PY 2010
VL 1
IS 18
BP 2699
EP 2704
DI 10.1021/jz100794z
PG 6
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 652OO
UT WOS:000282017400016
ER
PT J
AU Grills, DC
Fujita, E
AF Grills, David C.
Fujita, Etsuko
TI New Directions for the Photocatalytic Reduction of CO2: Supramolecular,
scCO(2) or Biphasic Ionic Liquid-scCO(2) Systems
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID PHOTOCHEMICAL CARBON-DIOXIDE; METAL-COMPLEXES; HOMOGENEOUS CATALYSTS;
SUPERCRITICAL FLUIDS; VISIBLE-LIGHT; HIGH-PRESSURE; STEADY-STATE; RE-RE;
LIQUIDS; RUTHENIUM
AB There is an urgent need for the discovery of carbon-neutral sources of energy to avoid the consequences of global warming caused by ever-increasing atmospheric CO2 levels. An attractive possibility is to use CO2 captured from industrial emissions as a feedstock for the production of useful fuels and precursors such as carbon monoxide and methanol. An active field of research to achieve this goal is the development of catalysts capable of harnessing solar energy for use in artificial photosynthetic processes for CO2 reduction. Transition-metal complexes are excellent candidates, and it has already been shown that they can be used to reduce CO2 with high quantum efficiency. However, they generally, suffer from poor visible light absorption, short catalyst lifetimes, and poor reaction. rates. In this Perspective, the field of photocatalytic CO2 reduction is introduced, and recent developments that seek to improve the efficiency of such catalytic processes are highlighted, especially CO2 reduction with supramolecules and molecular systems in supercritical CO2 (scCO(2)) or biphasic ionic liquid scCO(2) mixtures.
C1 [Grills, David C.; Fujita, Etsuko] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
RP Grills, DC (reprint author), Brookhaven Natl Lab, Dept Chem, POB 5000, Upton, NY 11973 USA.
EM dcgrills@bnl.gov
RI Fujita, Etsuko/D-8814-2013; Grills, David/F-7196-2016
OI Grills, David/0000-0001-8349-9158
FU U.S. Department of Energy, Division of Chemical Sciences, Geosciences, &
Biosciences, Office of Basic Energy Sciences [DE-AC02-98CH10886]
FX The work at Brookhaven National Laboratory is funded under Contract
DE-AC02-98CH10886 with the U.S. Department of Energy and supported by
its Division of Chemical Sciences, Geosciences, & Biosciences, Office of
Basic Energy Sciences. We thank Dr. James Wishart for helpful
discussions on RTILs.
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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 SEP 16
PY 2010
VL 1
IS 18
BP 2709
EP 2718
DI 10.1021/jz1010237
PG 10
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 652OO
UT WOS:000282017400018
ER
PT J
AU Kay, JJ
Klos, J
Alexander, MH
Strecker, KE
Chandler, DW
AF Kay, Jeffrey J.
Klos, Jacek
Alexander, Millard H.
Strecker, Kevin E.
Chandler, David W.
TI Cold atoms by kinematic cooling
SO PHYSICAL REVIEW A
LA English
DT Article
ID MOLECULES; COLLISIONS; ENERGY; ARGON; BEAMS; SLOW
AB We report the preparation and observation of translationally cold atoms using kinematic cooling. In these experiments, krypton atoms are cooled to subkelvin temperatures by elastic collisions in crossed atomic beams. Two independent velocity measurements indicate an upper-bound mean velocity of 13 m/s (E(trans)/k = 850 mK) and are consistent with a much lower mean velocity of 4m/s (E(trans)/k = 80 mK) (k is Boltzmann's constant). The density of the cold atoms is measured to be 109 atoms/cm(3). Scattering calculations and diffusion models support these velocity and density measurements. The results demonstrate that cold, dense samples of ground-state atoms and molecules can be prepared by elastic collisions between identical collision partners.
C1 [Kay, Jeffrey J.; Strecker, Kevin E.; Chandler, David W.] Sandia Natl Labs, Livermore, CA 94550 USA.
[Klos, Jacek; Alexander, Millard H.] Univ Maryland, College Pk, MD 20742 USA.
RP Strecker, KE (reprint author), Sandia Natl Labs, Livermore, CA 94550 USA.
EM kstreck@sandia.gov; chand@sandia.gov
RI Klos, Jacek/A-6457-2008
OI Klos, Jacek/0000-0002-7407-303X
FU US Department of Energy, Office of Basic Energy Science
FX The authors would like to acknowledge Mark Jaska for technical support.
Funding for this work was provided by the US Department of Energy,
Office of Basic Energy Science. Sandia is a multiprogram laboratory
operated by Sandia Corporation, a Lockheed Martin Company, for the US
Department of Energy.
NR 25
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U1 1
U2 18
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 SEP 16
PY 2010
VL 82
IS 3
AR 032709
DI 10.1103/PhysRevA.82.032709
PG 9
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 652JU
UT WOS:000282003500005
ER
PT J
AU Androulakis, J
Todorov, I
Chung, DY
Ballikaya, S
Wang, GY
Uher, C
Kanatzidis, M
AF Androulakis, John
Todorov, Iliya
Chung, Duck-Young
Ballikaya, Sedat
Wang, Guoyu
Uher, Ctirad
Kanatzidis, Mercouri
TI Thermoelectric enhancement in PbTe with K or Na codoping from tuning the
interaction of the light- and heavy-hole valence bands
SO PHYSICAL REVIEW B
LA English
DT Article
ID LEAD-TELLURIDE; NANOSTRUCTURED THERMOELECTRICS; CHALCOGENIDES;
EFFICIENCY; STATES
AB The effect of K and K-Na substitution for Pb atoms in the rocksalt lattice of PbTe was investigated to test a hypothesis for development of resonant states in the valence band that may enhance the thermoelectric power. We combined high-temperature Hall-effect, electrical conductivity, and thermal conductivity measurements to show that K-Na codoping do not form resonance states but can control the energy difference of the maxima of the two primary valence subbands in PbTe. This leads to an enhanced interband interaction with rising temperature and a significant rise in the thermoelectric figure of merit of p-type PbTe. The experimental data can be explained by a combination of a single- and two-band models for the valence band of PbTe depending on hole density that varies in the range of 1-15 X 10(19) cm(-3).
C1 [Androulakis, John; Kanatzidis, Mercouri] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA.
[Todorov, Iliya; Chung, Duck-Young; Kanatzidis, Mercouri] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Ballikaya, Sedat; Wang, Guoyu; Uher, Ctirad] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA.
[Ballikaya, Sedat] Istanbul Univ, Dept Phys, TR-34134 Istanbul, Turkey.
RP Androulakis, J (reprint author), Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA.
EM m-kanatzidis@northwestern.edu
RI Wang, Guoyu/A-9544-2011;
OI Wang, Guoyu/0000-0003-0431-742X
FU Office of Naval Research [N00014-08-1-0613]; U.S. Department of Energy,
Office of Basic Energy Sciences [DE-SC0001054]; Department of Energy,
Office of Basic Energy Sciences [DE-AC02-06CH11357]
FX This work was supported by the Office of Naval Research (Grant No.
N00014-08-1-0613). The work at the University of Michigan is supported
as part of the Revolutionary Materials for Solid State Energy
Conversion, an Energy Frontier Research Center funded by the U.S.
Department of Energy, Office of Basic Energy Sciences under Award No.
DE-SC0001054. The work at Argonne National Laboratory is supported by
Department of Energy, Office of Basic Energy Sciences (Grant No.
DE-AC02-06CH11357).
NR 34
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U2 49
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 SEP 16
PY 2010
VL 82
IS 11
AR 115209
DI 10.1103/PhysRevB.82.115209
PG 8
WC Physics, Condensed Matter
SC Physics
GA 652LG
UT WOS:000282007400002
ER
PT J
AU Burdman, G
Da Rold, L
Matheus, RD
AF Burdman, G.
Da Rold, L.
Matheus, R. D.
TI Lepton sector of a fourth generation
SO PHYSICAL REVIEW D
LA English
DT Article
ID ELECTROWEAK SYMMETRY-BREAKING; STANDARD MODEL; COMPOSITE HIGGS; QUARK;
PHYSICS; FAMILY; PHASE
AB In extensions of the standard model with a heavy fourth generation, one important question is what makes the fourth-generation lepton sector, particularly the neutrinos, so different from the lighter three generations. We study this question in the context of models of electroweak symmetry breaking in warped extra dimensions, where the flavor hierarchy is generated by choosing the localization of the zero-mode fermions in the extra dimension. In this setup the Higgs sector is localized near the infrared brane, whereas the Majorana mass term is localized at the ultraviolet brane. As a result, light neutrinos are almost entirely Majorana particles, whereas the fourth-generation neutrino is mostly a Dirac fermion. We show that it is possible to obtain heavy fourth-generation leptons in regions of parameter space where the light neutrino masses and mixings are compatible with observation. We study the impact of these bounds, as well as the ones from lepton flavor violation, on the phenomenology of these models.
C1 [Burdman, G.] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
[Burdman, G.; Matheus, R. D.] Univ Sao Paulo, Inst Fis, BR-01498 Sao Paulo, Brazil.
[Da Rold, L.] Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina.
RP Burdman, G (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.
RI Burdman, Gustavo/D-3285-2012; Matheus, Ricardo D'Elia/G-2957-2012
OI Matheus, Ricardo D'Elia/0000-0003-2132-8251
FU John Simon Guggenheim Foundation; Conselho Nacional de Desenvolvimento
Cientifico e Tecnologico (CNPq); U.S. Department of Energy
[DE-AC02-07CH11359]; FAPESP (Sao Paulo State Research Foundation)
FX G. B. acknowledges support from the John Simon Guggenheim Foundation and
the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
(CNPq). Fermilab is operated by Fermi Research Alliance, LLC under
Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy. L. D.
thanks Alejandro Szynkman for very useful discussions on four body
decays and Daniel de Florian for suggesting the use of COMPHEP for
many-body decays. R. D. M. acknowledges support from FAPESP (Sao Paulo
State Research Foundation).
NR 62
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U1 1
U2 2
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 SEP 16
PY 2010
VL 82
IS 5
AR 055015
DI 10.1103/PhysRevD.82.055015
PG 17
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 652XI
UT WOS:000282045400003
ER
PT J
AU Sanchez, PDA
Lees, JP
Poireau, V
Prencipe, E
Tisserand, V
Tico, JG
Grauges, E
Martinelli, M
Palano, A
Pappagallo, M
Eigen, G
Stugu, B
Sun, L
Battaglia, M
Brown, DN
Hooberman, B
Kerth, LT
Kolomensky, YG
Lynch, G
Osipenkov, IL
Tanabe, T
Hawkes, CM
Watson, AT
Koch, H
Schroeder, T
Asgeirsson, DJ
Hearty, C
Mattison, TS
McKenna, JA
Khan, A
Randle-Conde, A
Blinov, VE
Buzykaev, AR
Druzhinin, VP
Golubev, VB
Onuchin, AP
Serednyakov, SI
Skovpen, YI
Solodov, EP
Todyshev, KY
Yushkov, AN
Bondioli, M
Curry, S
Kirkby, D
Lankford, AJ
Mandelkern, M
Martin, EC
Stoker, DP
Atmacan, H
Gary, JW
Liu, F
Long, O
Vitug, GM
Campagnari, C
Hong, TM
Kovalskyi, D
Richman, JD
Eisner, AM
Heusch, CA
Kroseberg, J
Lockman, WS
Martinez, AJ
Schalk, T
Schumm, BA
Seiden, A
Winstrom, LO
Cheng, CH
Doll, DA
Echenard, B
Hitlin, DG
Ongmongkolkul, P
Porter, FC
Rakitin, AY
Andreassen, R
Dubrovin, MS
Mancinelli, G
Meadows, BT
Sokoloff, MD
Bloom, PC
Ford, WT
Gaz, A
Hirschauer, JF
Nagel, M
Nauenberg, U
Smith, JG
Wagner, SR
Ayad, R
Toki, WH
Karbach, TM
Merkel, J
Petzold, A
Spaan, B
Wacker, K
Kobel, MJ
Schubert, KR
Schwierz, R
Bernard, D
Verderi, M
Clark, PJ
Playfer, S
Watson, JE
Andreotti, M
Bettoni, D
Bozzi, C
Calabrese, R
Cecchi, A
Cibinetto, G
Fioravanti, E
Franchini, P
Luppi, E
Munerato, M
Negrini, M
Petrella, A
Piemontese, L
Baldini-Ferroli, R
Calcaterra, A
de Sangro, R
Finocchiaro, G
Nicolaci, M
Pacetti, S
Patteri, P
Peruzzi, IM
Piccolo, M
Rama, M
Zallo, A
Contri, R
Guido, E
Vetere, M
Monge, MR
Passaggio, S
Patrignani, C
Robutti, E
Tosi, S
Bhuyan, B
Morii, M
Adametz, A
Marks, J
Schenk, S
Uwer, U
Bernlochner, FU
Lacker, HM
Lueck, T
Volk, A
Dauncey, PD
Tibbetts, M
Behera, PK
Mallik, U
Chen, C
Cochran, J
Crawley, HB
Dong, L
Meyer, WT
Prell, S
Rosenberg, EI
Rubin, AE
Gao, YY
Gritsan, AV
Guo, ZJ
Arnaud, N
Davier, M
Derkach, D
da Costa, JF
Grosdidier, G
Le Diberder, F
Lutz, AM
Malaescu, B
Perez, A
Roudeau, P
Schune, MH
Serrano, J
Sordini, V
Stocchi, A
Wang, L
Wormser, G
Lange, DJ
Wright, DM
Bingham, I
Burke, JP
Chavez, CA
Coleman, JP
Fry, JR
Gabathuler, E
Gamet, R
Hutchcroft, DE
Payne, DJ
Touramanis, C
Bevan, AJ
Di Lodovico, F
Sacco, R
Sigamani, M
Cowan, G
Paramesvaran, S
Wren, AC
Brown, DN
Davis, CL
Denig, AG
Fritsch, M
Gradl, W
Hafner, A
Alwyn, KE
Bailey, D
Barlow, RJ
Jackson, G
Lafferty, GD
West, TJ
Anderson, J
Cenci, R
Jawahery, A
Roberts, DA
Simi, G
Tuggle, JM
Dallapiccola, C
Salvati, E
Cowan, R
Dujmic, D
Fisher, PH
Sciolla, G
Zhao, M
Lindemann, D
Patel, PM
Robertson, SH
Schram, M
Biassoni, P
Lazzaro, A
Lombardo, V
Palombo, F
Stracka, S
Cremaldi, L
Godang, R
Kroeger, R
Sonnek, P
Summers, DJ
Zhao, HW
Nguyen, X
Simard, M
Taras, P
Nardo, G
Monorchio, D
Onorato, G
Sciacca, C
Raven, G
Snoek, HL
Jessop, CP
Knoepfel, KJ
LoSecco, JM
Wang, WF
Corwin, LA
Honscheid, K
Kass, R
Morris, JP
Rahimi, AM
Blount, NL
Brau, J
Frey, R
Igonkina, O
Kolb, JA
Rahmat, R
Sinev, NB
Strom, D
Strube, J
Torrence, E
Castelli, G
Feltresi, E
Gagliardi, N
Margoni, M
Morandin, M
Posocco, M
Rotondo, M
Simonetto, F
Stroili, R
Ben-Haim, E
Bonneaud, GR
Briand, H
Calderini, G
Chauveau, J
Hamon, O
Leruste, P
Marchiori, G
Ocariz, J
Prendki, J
Sitt, S
Biasini, M
Manoni, E
Angelini, C
Batignani, G
Bettarini, S
Carpinelli, M
Casarosa, G
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Young, CC
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Chen, XR
Park, W
Purohit, MV
White, RM
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Sekula, SJ
Bellis, M
Burchat, PR
Edwards, AJ
Miyashita, TS
Ahmed, S
Alam, MS
Ernst, JA
Pan, B
Saeed, MA
Zain, SB
Guttman, N
Soffer, A
Lund, P
Spanier, SM
Eckmann, R
Ritchie, JL
Ruland, AM
Schilling, CJ
Schwitters, RF
Wray, BC
Izen, JM
Lou, XC
Bianchi, F
Gamba, D
Pelliccioni, M
Bomben, M
Lanceri, L
Vitale, L
Lopez-March, N
Martinez-Vidal, F
Milanes, DA
Oyanguren, A
Albert, J
Banerjee, S
Choi, HHF
Hamano, K
King, GJ
Kowalewski, R
Lewczuk, MJ
Nugent, IM
Roney, JM
Sobie, RJ
Gershon, TJ
Harrison, PF
Ilic, J
Latham, TE
Puccio, EMT
Band, HR
Chen, X
Dasu, S
Flood, KT
Pan, Y
Prepost, R
Vuosalo, CO
Wu, SL
AF Sanchez, P. del Amo
Lees, J. P.
Poireau, V.
Prencipe, E.
Tisserand, V.
Tico, J. Garra
Grauges, E.
Martinelli, M.
Palano, A.
Pappagallo, M.
Eigen, G.
Stugu, B.
Sun, L.
Battaglia, M.
Brown, D. N.
Hooberman, B.
Kerth, L. T.
Kolomensky, Yu. G.
Lynch, G.
Osipenkov, I. L.
Tanabe, T.
Hawkes, C. M.
Watson, A. T.
Koch, H.
Schroeder, T.
Asgeirsson, D. J.
Hearty, C.
Mattison, T. S.
McKenna, J. A.
Khan, A.
Randle-Conde, A.
Blinov, V. E.
Buzykaev, A. R.
Druzhinin, V. P.
Golubev, V. B.
Onuchin, A. P.
Serednyakov, S. I.
Skovpen, Yu. I.
Solodov, E. P.
Todyshev, K. Yu.
Yushkov, A. N.
Bondioli, M.
Curry, S.
Kirkby, D.
Lankford, A. J.
Mandelkern, M.
Martin, E. C.
Stoker, D. P.
Atmacan, H.
Gary, J. W.
Liu, F.
Long, O.
Vitug, G. M.
Campagnari, C.
Hong, T. M.
Kovalskyi, D.
Richman, J. D.
Eisner, A. M.
Heusch, C. A.
Kroseberg, J.
Lockman, W. S.
Martinez, A. J.
Schalk, T.
Schumm, B. A.
Seiden, A.
Winstrom, L. O.
Cheng, C. H.
Doll, D. A.
Echenard, B.
Hitlin, D. G.
Ongmongkolkul, P.
Porter, F. C.
Rakitin, A. Y.
Andreassen, R.
Dubrovin, M. S.
Mancinelli, G.
Meadows, B. T.
Sokoloff, M. D.
Bloom, P. C.
Ford, W. T.
Gaz, A.
Hirschauer, J. F.
Nagel, M.
Nauenberg, U.
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Wagner, S. R.
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Toki, W. H.
Karbach, T. M.
Merkel, J.
Petzold, A.
Spaan, B.
Wacker, K.
Kobel, M. J.
Schubert, K. R.
Schwierz, R.
Bernard, D.
Verderi, M.
Clark, P. J.
Playfer, S.
Watson, J. E.
Andreotti, M.
Bettoni, D.
Bozzi, C.
Calabrese, R.
Cecchi, A.
Cibinetto, G.
Fioravanti, E.
Franchini, P.
Luppi, E.
Munerato, M.
Negrini, M.
Petrella, A.
Piemontese, L.
Baldini-Ferroli, R.
Calcaterra, A.
de Sangro, R.
Finocchiaro, G.
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Pacetti, S.
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Rama, M.
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Schenk, S.
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Paramesvaran, S.
Wren, A. C.
Brown, D. N.
Davis, C. L.
Denig, A. G.
Fritsch, M.
Gradl, W.
Hafner, A.
Alwyn, K. E.
Bailey, D.
Barlow, R. J.
Jackson, G.
Lafferty, G. D.
West, T. J.
Anderson, J.
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Jawahery, A.
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Cervelli, A.
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Giorgi, M. A.
Lusiani, A.
Neri, N.
Paoloni, E.
Rizzo, G.
Walsh, J. J.
Pegna, D. Lopes
Lu, C.
Olsen, J.
Smith, A. J. S.
Telnov, A. V.
Anulli, F.
Baracchini, E.
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Faccini, R.
Ferrarotto, F.
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Gaspero, M.
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Mazzoni, M. A.
Piredda, G.
Renga, F.
Ebert, M.
Hartmann, T.
Leddig, T.
Schroeder, H.
Waldi, R.
Adye, T.
Franek, B.
Olaiya, E. O.
Wilson, F. F.
Emery, S.
de Monchenault, G. Hamel
Vasseur, G.
Yeche, Ch.
Zito, M.
Aitchison, I. J. R.
Allen, M. T.
Aston, D.
Bard, D. J.
Bartoldus, R.
Benitez, J. F.
Cartaro, C.
Convery, M. R.
Dorfan, J.
Dubois-Felsmann, G. P.
Dunwoodie, W.
Field, R. C.
Sevilla, M. Franco
Fulsom, B. G.
Gabareen, A. M.
Graham, M. T.
Grenier, P.
Hast, C.
Innes, W. R.
Kelsey, M. H.
Kim, H.
Kim, P.
Kocian, M. L.
Leith, D. W. G. S.
Li, S.
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Luitz, S.
Luth, V.
Lynch, H. L.
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Marsiske, H.
Muller, D. R.
Neal, H.
Nelson, S.
O'Grady, C. P.
Ofte, I.
Perl, M.
Pulliam, T.
Ratcliff, B. N.
Roodman, A.
Salnikov, A. A.
Santoro, V.
Schindler, R. H.
Schwiening, J.
Snyder, A.
Su, D.
Sullivan, M. K.
Sun, S.
Suzuki, K.
Thompson, J. M.
Va'vra, J.
Wagner, A. P.
Weaver, M.
West, C. A.
Wisniewski, W. J.
Wittgen, M.
Wright, D. H.
Wulsin, H. W.
Yarritu, A. K.
Young, C. C.
Ziegler, V.
Chen, X. R.
Park, W.
Purohit, M. V.
White, R. M.
Wilson, J. R.
Sekula, S. J.
Bellis, M.
Burchat, P. R.
Edwards, A. J.
Miyashita, T. S.
Ahmed, S.
Alam, M. S.
Ernst, J. A.
Pan, B.
Saeed, M. A.
Zain, S. B.
Guttman, N.
Soffer, A.
Lund, P.
Spanier, S. M.
Eckmann, R.
Ritchie, J. L.
Ruland, A. M.
Schilling, C. J.
Schwitters, R. F.
Wray, B. C.
Izen, J. M.
Lou, X. C.
Bianchi, F.
Gamba, D.
Pelliccioni, M.
Bomben, M.
Lanceri, L.
Vitale, L.
Lopez-March, N.
Martinez-Vidal, F.
Milanes, D. A.
Oyanguren, A.
Albert, J.
Banerjee, Sw.
Choi, H. H. F.
Hamano, K.
King, G. J.
Kowalewski, R.
Lewczuk, M. J.
Nugent, I. M.
Roney, J. M.
Sobie, R. J.
Gershon, T. J.
Harrison, P. F.
Ilic, J.
Latham, T. E.
Puccio, E. M. T.
Band, H. R.
Chen, X.
Dasu, S.
Flood, K. T.
Pan, Y.
Prepost, R.
Vuosalo, C. O.
Wu, S. L.
CA Collaboration, B
TI Evidence for Direct CP Violation in the Measurement of the
Cabbibo-Kobayashi-Maskawa Angle gamma with B--/+ -> D-(*K-)(()*()-/+)
Decays
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID PHYSICS; MATRIX; ASYMMETRIES
AB We report the measurement of the Cabibbo-Kobayashi-Maskawa CP-violating angle gamma through a Dalitz plot analysis of neutral D-meson decays to K-S(0)pi(+) pi(-) and K-S(0) K+ K- produced in the processes B--/+ -> DK -/+, B--/+ -> D* K--/+ with D* -> D pi(0), D gamma and B -/+ DK*-/+ with K*(-/+) -> K-S(0)pi(-/+), using 468 million B (B) over bar pairs collected by the BABAR detector at the PEP-II asymmetric-energy e(+)e(-) collider at SLAC. We measure gamma = (68 +/- 14 +/- 4 +/- 3)degrees (modulo 180 degrees), where the first error is statistical, the second is the experimental systematic uncertainty, and the third reflects the uncertainty in the description of the neutral D decay amplitudes. This result is inconsistent with gamma = 0 ( no direct CP violation) with a significance of 3.5 standard deviations.
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[Raven, G.; Snoek, H. L.] Natl Inst Nucl Phys & High Energy Phys, NIKHEF, NL-1009 DB Amsterdam, Netherlands.
[Jessop, C. P.; Knoepfel, K. J.; LoSecco, J. M.; Wang, W. F.] Univ Notre Dame, Notre Dame, IN 46556 USA.
[Corwin, L. A.; Honscheid, K.; Kass, R.; Morris, J. P.; Rahimi, A. M.] Ohio State Univ, Columbus, OH 43210 USA.
[Blount, N. L.; Brau, J.; Frey, R.; Igonkina, O.; Kolb, J. A.; Rahmat, R.; Sinev, N. B.; Strom, D.; Strube, J.; Torrence, E.] Univ Oregon, Eugene, OR 97403 USA.
[Castelli, G.; Feltresi, E.; Gagliardi, N.; Margoni, M.; Morandin, M.; Posocco, M.; Rotondo, M.; Simonetto, F.; Stroili, R.] INFN Sez Padova, I-35131 Padua, Italy.
[Castelli, G.; Feltresi, E.; Gagliardi, N.; Margoni, M.; Simonetto, F.; Stroili, R.] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy.
[Ben-Haim, E.; Bonneaud, G. R.; Briand, H.; Calderini, G.; Chauveau, J.; Hamon, O.; Leruste, Ph.; Marchiori, G.; Ocariz, J.; Prendki, J.; Sitt, S.] Univ Denis Diderot Paris 7, IN2P3, CNRS, Lab Phys Nucl & Hautes Energies,Univ Pierre & Cur, F-75252 Paris, France.
[Biasini, M.; Manoni, E.] INFN Sez Perugia, I-06100 Perugia, Italy.
[Biasini, M.; Manoni, E.] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy.
[Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Neri, N.; Paoloni, E.; Rizzo, G.; Walsh, J. J.] INFN Sez Pisa, I-56127 Pisa, Italy.
[Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Neri, N.; Paoloni, E.; Rizzo, G.] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy.
[Lusiani, A.] Scuola Normale Super Pisa, I-56126 Pisa, Italy.
[Pegna, D. Lopes; Lu, C.; Olsen, J.; Smith, A. J. S.; Telnov, A. V.] Princeton Univ, Princeton, NJ 08544 USA.
[Anulli, F.; Baracchini, E.; Cavoto, G.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Gioi, L. Li; Mazzoni, M. A.; Piredda, G.; Renga, F.] INFN Sez Roma, I-00185 Rome, Italy.
[Baracchini, E.; Faccini, R.; Ferroni, F.; Gaspero, M.; Renga, F.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy.
[Ebert, M.; Hartmann, T.; Leddig, T.; Schroeder, H.; Waldi, R.] Univ Rostock, D-18051 Rostock, Germany.
[Adye, T.; Franek, B.; Olaiya, E. O.; Wilson, F. F.] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England.
[Emery, S.; de Monchenault, G. Hamel; Vasseur, G.; Yeche, Ch.; Zito, M.] CEA, Irfu, SPP, Ctr Saclay, F-91191 Gif Sur Yvette, France.
[Aitchison, I. J. R.; Allen, M. T.; Aston, D.; Bard, D. J.; Bartoldus, R.; Benitez, J. F.; Cartaro, C.; Convery, M. R.; Dorfan, J.; Dubois-Felsmann, G. P.; Dunwoodie, W.; Field, R. C.; Sevilla, M. Franco; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Grenier, P.; Hast, C.; Innes, W. R.; Kelsey, M. H.; Kim, H.; Kim, P.; Kocian, M. L.; Leith, D. W. G. S.; Li, S.; Lindquist, B.; Luitz, S.; Luth, V.; Lynch, H. L.; MacFarlane, D. B.; Marsiske, H.; Muller, D. R.; Neal, H.; Nelson, S.; O'Grady, C. P.; Ofte, I.; Perl, M.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Santoro, V.; Schindler, R. H.; Schwiening, J.; Snyder, A.; Su, D.; Sullivan, M. K.; Sun, S.; Suzuki, K.; Thompson, J. M.; Va'vra, J.; Wagner, A. P.; Weaver, M.; West, C. A.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Wulsin, H. W.; Yarritu, A. K.; Young, C. C.; Ziegler, V.] SLAC Natl Accelerator Lab, Stanford, CA 94309 USA.
[Chen, X. R.; Park, W.; Purohit, M. V.; White, R. M.; Wilson, J. R.] Univ S Carolina, Columbia, SC 29208 USA.
[Sekula, S. J.] So Methodist Univ, Dallas, TX 75275 USA.
[Bellis, M.; Burchat, P. R.; Edwards, A. J.; Miyashita, T. S.] Stanford Univ, Stanford, CA 94305 USA.
[Ahmed, S.; Alam, M. S.; Ernst, J. A.; Pan, B.; Saeed, M. A.; Zain, S. B.] SUNY Albany, Albany, NY 12222 USA.
[Guttman, N.; Soffer, A.] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel.
[Lund, P.; Spanier, S. M.] Univ Tennessee, Knoxville, TN 37996 USA.
[Eckmann, R.; Ritchie, J. L.; Ruland, A. M.; Schilling, C. J.; Schwitters, R. F.; Wray, B. C.] Univ Texas Austin, Austin, TX 78712 USA.
[Izen, J. M.; Lou, X. C.] Univ Texas Dallas, Richardson, TX 75083 USA.
[Bianchi, F.; Gamba, D.; Pelliccioni, M.] INFN Sez Torino, I-10125 Turin, Italy.
[Bianchi, F.; Gamba, D.; Pelliccioni, M.] Univ Torino, Dipartimento Fis Sperimentale, I-10125 Turin, Italy.
[Bomben, M.; Lanceri, L.; Vitale, L.] INFN Sez Trieste, I-34127 Trieste, Italy.
[Bomben, M.; Lanceri, L.; Vitale, L.] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy.
[Lopez-March, N.; Martinez-Vidal, F.; Milanes, D. A.; Oyanguren, A.] Univ Valencia, CSIC, IFIC, E-4071 Valencia, Spain.
[Albert, J.; Banerjee, Sw.; Choi, H. H. F.; Hamano, K.; King, G. J.; Kowalewski, R.; Lewczuk, M. J.; Nugent, I. M.; Roney, J. M.; Sobie, R. J.] Univ Victoria, Victoria, BC V8W 3P6, Canada.
[Gershon, T. J.; Harrison, P. F.; Ilic, J.; Latham, T. E.; Puccio, E. M. T.] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England.
[Band, H. R.; Chen, X.; Dasu, S.; Flood, K. T.; Pan, Y.; Prepost, R.; Vuosalo, C. O.; Wu, S. L.] Univ Wisconsin, Madison, WI 53706 USA.
[Peruzzi, I. M.] Univ Perugia, Dipartimento Fis, Perugia, Italy.
Univ Roma La Sapienza, I-00185 Rome, Italy.
[Carpinelli, M.] Univ Sassari, Sassari, Italy.
[Aitchison, I. J. R.] Univ Oxford, Dept Theoret Phys, Oxford OX1 3NP, England.
RP Sanchez, PDA (reprint author), Univ Savoie, CNRS, IN2P3, Lab Annecy Le Vieux Phys Particules, F-74941 Annecy Le Vieux, France.
RI dong, liaoyuan/A-5093-2015; Rizzo, Giuliana/A-8516-2015; Martinez Vidal,
F*/L-7563-2014; Kolomensky, Yury/I-3510-2015; Lo Vetere,
Maurizio/J-5049-2012; Lusiani, Alberto/N-2976-2015; Morandin,
Mauro/A-3308-2016; Lusiani, Alberto/A-3329-2016; Stracka,
Simone/M-3931-2015; Di Lodovico, Francesca/L-9109-2016; Pappagallo,
Marco/R-3305-2016; Calcaterra, Alessandro/P-5260-2015; Frey,
Raymond/E-2830-2016; Luppi, Eleonora/A-4902-2015; Neri,
Nicola/G-3991-2012; White, Ryan/E-2979-2015; Forti,
Francesco/H-3035-2011; Calabrese, Roberto/G-4405-2015; Rotondo,
Marcello/I-6043-2012; de Sangro, Riccardo/J-2901-2012; Saeed, Mohammad
Alam/J-7455-2012; Negrini, Matteo/C-8906-2014; Patrignani,
Claudia/C-5223-2009; Monge, Maria Roberta/G-9127-2012; Oyanguren,
Arantza/K-6454-2014
OI Cibinetto, Gianluigi/0000-0002-3491-6231; dong,
liaoyuan/0000-0002-4773-5050; Pacetti, Simone/0000-0002-6385-3508;
Rizzo, Giuliana/0000-0003-1788-2866; Faccini,
Riccardo/0000-0003-2613-5141; Martinez Vidal, F*/0000-0001-6841-6035;
Kolomensky, Yury/0000-0001-8496-9975; Lo Vetere,
Maurizio/0000-0002-6520-4480; Lusiani, Alberto/0000-0002-6876-3288;
Morandin, Mauro/0000-0003-4708-4240; Lusiani,
Alberto/0000-0002-6876-3288; Stracka, Simone/0000-0003-0013-4714; Di
Lodovico, Francesca/0000-0003-3952-2175; Pappagallo,
Marco/0000-0001-7601-5602; Calcaterra, Alessandro/0000-0003-2670-4826;
Frey, Raymond/0000-0003-0341-2636; Paoloni, Eugenio/0000-0001-5969-8712;
Luppi, Eleonora/0000-0002-1072-5633; Neri, Nicola/0000-0002-6106-3756;
White, Ryan/0000-0003-3589-5900; Forti, Francesco/0000-0001-6535-7965;
Calabrese, Roberto/0000-0002-1354-5400; Rotondo,
Marcello/0000-0001-5704-6163; de Sangro, Riccardo/0000-0002-3808-5455;
Saeed, Mohammad Alam/0000-0002-3529-9255; Negrini,
Matteo/0000-0003-0101-6963; Patrignani, Claudia/0000-0002-5882-1747;
Monge, Maria Roberta/0000-0003-1633-3195; Oyanguren,
Arantza/0000-0002-8240-7300
NR 35
TC 40
Z9 40
U1 2
U2 12
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
EI 1079-7114
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD SEP 16
PY 2010
VL 105
IS 12
AR 121801
DI 10.1103/PhysRevLett.105.121801
PG 7
WC Physics, Multidisciplinary
SC Physics
GA 653ZH
UT WOS:000282137400002
ER
PT J
AU Hudelson, S
Newman, BK
Bernardis, S
Fenning, DP
Bertoni, MI
Marcus, MA
Fakra, SC
Lai, B
Buonassisi, T
AF Hudelson, Steve
Newman, Bonna K.
Bernardis, Sarah
Fenning, David P.
Bertoni, Mariana I.
Marcus, Matthew A.
Fakra, Sirine C.
Lai, Barry
Buonassisi, Tonio
TI Retrograde Melting and Internal Liquid Gettering in Silicon
SO ADVANCED MATERIALS
LA English
DT Article
ID X-RAY MICROPROBE; MULTICRYSTALLINE SILICON; ELECTRON-MICROSCOPE;
BINARY-SYSTEMS; METAL; MECHANISMS; DEFECTS; GROWTH
AB Retrograde melting (melting upon cooling) is observed in silicon doped with 3d transition metals, via synchrotron-based temperature-dependent X-ray microprobe measurements. Liquid metal-silicon droplets formed via retrograde melting act as efficient sinks for metal impurities dissolved within the silicon matrix. Cooling results in decomposition of the homogeneous liquid phase into solid multiple-metal alloy precipitates. These phenomena represent a novel pathway for engineering impurities in semiconductor-based systems.
C1 [Hudelson, Steve; Newman, Bonna K.; Bernardis, Sarah; Fenning, David P.; Bertoni, Mariana I.; Buonassisi, Tonio] MIT, Cambridge, MA 02139 USA.
[Marcus, Matthew A.; Fakra, Sirine C.] Univ Calif Berkeley, Lawrence Berkeley Lab, Adv Light Source, Berkeley, CA 94720 USA.
[Lai, Barry] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RP Buonassisi, T (reprint author), MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA.
EM buonassisi@mit.edu
RI Buonassisi, Tonio/J-2723-2012;
OI Fenning, David/0000-0002-4609-9312
FU U.S. Department of Energy [DE-FG36-09GO19001]; Office of Science, Office
of Basic Energy Sciences, of the U.S. Department of Energy
[DE-AC02-05CH11231, DE-AC02-06CH11357]; National Science Foundation
[ECS-0335765]
FX We thank J. McGinn and S. Cortex at McCrone Scientific for their
outstanding equipment support; M. Heuer, S. Langkau, M.D. Pickett, S.
Riepe, and E.L. Thomas for enlightening discussions; S. Speakman for
assistance with XRD; and Y.S. Lee for assisting with e-beam evaporation
and sputtering. Support for this research was provided by the U.S.
Department of Energy, under contract number DE-FG36-09GO19001, and
through the generous support of Doug Spreng and the Chesonis Family
Foundation. S. Hudelson and D.P. Fenning acknowledge the National
Science Foundation; B. Newman the Claire Boothe Luce Foundation. The
Advanced Light Source and the Advanced Photon Source are supported by
the Director, Office of Science, Office of Basic Energy Sciences, of the
U.S. Department of Energy under Contracts No. DE-AC02-05CH11231 and
DE-AC02-06CH11357, respectively. This work was performed in part at the
Center for Nanoscale Systems (CNS), a. member of the National
Nanotechnology Infrastructure Network (NNIN), which is supported by the
National Science Foundation under NSF award no. ECS-0335765. CNS is part
of the Faculty or Arts and Sciences at Harvard University.
NR 29
TC 9
Z9 9
U1 2
U2 13
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0935-9648
J9 ADV MATER
JI Adv. Mater.
PD SEP 15
PY 2010
VL 22
IS 35
BP 3948
EP +
DI 10.1002/adma.200904344
PG 7
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 663SM
UT WOS:000282910100005
PM 20672312
ER
PT J
AU Cabana, J
Monconduit, L
Larcher, D
Palacin, MR
AF Cabana, Jordi
Monconduit, Laure
Larcher, Dominique
Rosa Palacin, M.
TI Beyond Intercalation-Based Li-Ion Batteries: The State of the Art and
Challenges of Electrode Materials Reacting Through Conversion Reactions
SO ADVANCED MATERIALS
LA English
DT Article
ID RECHARGEABLE LITHIUM BATTERIES; METAL FLUORIDE NANOCOMPOSITES;
X-RAY-DIFFRACTION; FE-57 MOSSBAUER-SPECTROSCOPY; ALLOY NEGATIVE
ELECTRODES; COMPOSITE ANODE MATERIALS; HIGH-TEMPERATURE CELLS; THIN-FILM
ELECTRODES; HIGH-ENERGY DENSITY; ELECTROCHEMICAL PERFORMANCE
AB Despite the imminent commercial introduction of Li-ion batteries in electric drive vehicles and their proposed use as enablers of smart grids based on renewable energy technologies, an intensive quest for new electrode materials that bring about improvements in energy density, cycle life, cost, and safety is still underway. This Progress Report highlights the recent developments and the future prospects of the use of phases that react through conversion reactions as both positive and negative electrode materials in Li-ion batteries. By moving beyond classical intercalation reactions, a variety of low cost compounds with gravimetric specific capacities that are two-to-five times larger than those attained with currently used materials, such as graphite and LiCoO2, can be achieved. Nonetheless, several factors currently handicap the applicability of electrode materials entailing conversion reactions. These factors, together with the scientific breakthroughs that are necessary to fully assess the practicality of this concept, are reviewed in this report.
C1 [Rosa Palacin, M.] CSIC, Inst Ciencia Mat Barcelona, E-08193 Bellaterra, Catalonia, Spain.
[Cabana, Jordi] Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA.
[Monconduit, Laure] Univ Montpellier 2, Inst Charles Gerhardt, CNRS, F-34095 Montpellier, France.
[Larcher, Dominique] Univ Picardie Jules Verne, Lab React & Chim Solides, CNRS, UMR6007, F-80039 Amiens, France.
RP Palacin, MR (reprint author), CSIC, Inst Ciencia Mat Barcelona, Campus UAB, E-08193 Bellaterra, Catalonia, Spain.
EM rosa.palacin@icmab.es
RI Cabana, Jordi/G-6548-2012; Palacin, Maria Rosa/H-2163-2012
OI Cabana, Jordi/0000-0002-2353-5986; Palacin, Maria
Rosa/0000-0001-7351-2005
FU Office of FreedomCAR and Vehicle Technologies of the U.S. Department of
Energy [DE-AC02-05CH11231]; Ministerio de Ciencia e Innovacion (Spain)
[MAT2008-04587]
FX The authors thank Dr. K. A. Persson and Dr. T. J. Richardson (LBNL,
USA), and Prof. J.-M. Tarascon (LRCS, France) for providing very
valuable comments on the manuscript, and the academic and industrial
members of the ALISTORE-ERI for sharing interesting discussions. JC is
grateful to the Assistant Secretary for Energy Efficiency and Renewable
Energy, Office of FreedomCAR and Vehicle Technologies of the U.S.
Department of Energy for financial support under contract no.
DE-AC02-05CH11231. MRP would like to acknowledge funding from the
Ministerio de Ciencia e Innovacion (Spain) through grant MAT2008-04587.
NR 344
TC 938
Z9 949
U1 118
U2 943
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA POSTFACH 101161, 69451 WEINHEIM, GERMANY
SN 0935-9648
EI 1521-4095
J9 ADV MATER
JI Adv. Mater.
PD SEP 15
PY 2010
VL 22
IS 35
BP E170
EP E192
DI 10.1002/adma.201000717
PG 23
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 663SM
UT WOS:000282910100008
PM 20730811
ER
PT J
AU Kalinin, SV
Balke, N
AF Kalinin, Sergei V.
Balke, Nino
TI Local Electrochemical Functionality in Energy Storage Materials and
Devices by Scanning Probe Microscopies: Status and Perspectives
SO ADVANCED MATERIALS
LA English
DT Article
ID ATOMIC-FORCE MICROSCOPY; LITHIUM-ION BATTERIES; IN-SITU AFM; GRAPHITE
NEGATIVE ELECTRODE; ORIENTED PYROLYTIC-GRAPHITE; SURFACE-MORPHOLOGY
CHANGE; LIMN2O4 THIN-FILMS; ELEVATED-TEMPERATURES; IMPEDANCE MICROSCOPY;
NANOELECTRODE ARRAYS
AB Energy storage and conversion systems are an integral component of emerging green technologies, including mobile electronic devices, automotive, and storage components of solar and wind energy economics. Despite the rapidly expanding manufacturing capabilities and wealth of phenomenological information on the macroscopic device behaviors, the microscopic mechanisms underpinning battery and fuel cell operations in the nanometer-micrometer range are virtually unknown. This lack of information is due to the dearth of experimental techniques capable of addressing elementary mechanisms involved in battery operation, including electronic and ion transport, vacancy injection, and interfacial reactions, on the nanometer scale. In this article, a brief overview of scanning probe microscopy (SPM) methods addressing nanoscale electrochemical functionalities is provided and compared with macroscopic electrochemical methods. Future applications of emergent SPM methods, including near field optical, electromechanical, microwave, and thermal probes and combined SPM-(S)TEM (scanning transmission electron microscopy) methods in energy storage and conversion materials are discussed.
C1 [Kalinin, Sergei V.; Balke, Nino] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
RP Kalinin, SV (reprint author), Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
EM sergei2@ornl.gov
RI Kalinin, Sergei/I-9096-2012; Balke, Nina/Q-2505-2015
OI Kalinin, Sergei/0000-0001-5354-6152; Balke, Nina/0000-0001-5865-5892
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [ERKCC61]; Alexander von Humboldt foundation
FX We gratefully acknowledge multiple interactions with Nick Lavrik and
Maxim Nikiforov and their perspective on the microcantilever and thermal
imaging for battery studies. Research was supported by the Fluid
Interface Reactions, Structures and Transport (FIRST) Center, an Energy
Frontier Research Center funded by the U.S. Department of Energy, Office
of Science, Office of Basic Energy Sciences under Award Number ERKCC61,
and by the Alexander von Humboldt foundation.
NR 131
TC 41
Z9 41
U1 7
U2 129
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0935-9648
J9 ADV MATER
JI Adv. Mater.
PD SEP 15
PY 2010
VL 22
IS 35
BP E193
EP E209
DI 10.1002/adma.201001190
PG 17
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 663SM
UT WOS:000282910100009
PM 20730814
ER
PT J
AU Zeitlin, C
Guetersloh, S
Heilbronn, L
Miller, J
Fukumura, A
Iwata, Y
Murakami, T
Sihver, L
AF Zeitlin, C.
Guetersloh, S.
Heilbronn, L.
Miller, J.
Fukumura, A.
Iwata, Y.
Murakami, T.
Sihver, L.
TI Nuclear fragmentation database for GCR transport code development
SO ADVANCES IN SPACE RESEARCH
LA English
DT Article
DE Galactic Cosmic Rays; Nuclear fragmentation; Cross section; Transport;
Monte Carlo; PHITS
ID CROSS-SECTIONS; PHITS; FE-56; MODEL
AB A critical need for NASA is the ability to accurately model the transport of heavy ions in the Galactic Cosmic Rays (GCR) through matter, including spacecraft walls, equipment racks, etc. Nuclear interactions are of great importance in the GCR transport problem, as they can cause fragmentation of the incoming ion into lighter ions. Since the radiation dose delivered by a particle is proportional to the square of (charge/velocity), fragmentation reduces the dose delivered by incident ions. The other mechanism by which dose can be reduced is ionization energy loss, which can lead to some particles stopping in the shielding. This is the conventional notion of shielding, but it is not applicable to human spaceflight since the particles in the GCR tend to be too energetic to be stopped in the relatively thin shielding that is possible within payload mass constraints. Our group has measured a large number of fragmentation cross sections, intended to be used as input to, or for validation of, NASA's radiation transport models. A database containing over 200 charge-changing cross sections and over 2000 fragment production cross sections has been compiled. In this report, we examine in detail the contrast between fragment measurements at large acceptance and small acceptance. We use output from the PHITS Monte Carlo code to test our assumptions using as an example (40)Ar data (and simulated data) at a beam energy of 650 MeV/nucleon. We also present preliminary analysis in which isotopic resolution was attained for beryllium fragments produced by beams of (10)B and (11)B. Future work on the experimental data set will focus on extracting and interpreting production cross sections for light fragments. (C) 2010 COSPAR. Published by Elsevier Ltd. All rights reserved.
C1 [Zeitlin, C.] SW Res Inst, Boulder, CO 80302 USA.
[Guetersloh, S.; Sihver, L.] Texas A&M Univ, Dept Nucl Engn, College Stn, TX 77843 USA.
[Heilbronn, L.] Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA.
[Miller, J.] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
[Fukumura, A.; Iwata, Y.; Murakami, T.] Natl Inst Radiol Sci, Inage Ku, Chiba 2638555, Japan.
[Sihver, L.] Chalmers, SE-41296 Gothenburg, Sweden.
[Sihver, L.] Roanoke Coll, Dept Math Comp Sci & Phys, Salem, VA 24153 USA.
RP Zeitlin, C (reprint author), SW Res Inst, 1050 Walnut St, Boulder, CO 80302 USA.
EM zeitlin@boulder.swri.edu
RI Heilbronn, Lawrence/J-6998-2013
OI Heilbronn, Lawrence/0000-0002-8226-1057
FU Southwest Research Institute under NASA [NNX09AE18A]
FX These measurements would not be possible without the outstanding efforts
of the accelerator operators at HIMAC and NSRL. We thank them. The lead
author also wishes to thank Dr. Steve Blattnig of the NASA Langley
Research Center for many useful discussions and for continuing support
of the data-mining effort. This work is supported at Southwest Research
Institute under NASA Grant No. NNX09AE18A.
NR 11
TC 3
Z9 4
U1 0
U2 2
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0273-1177
J9 ADV SPACE RES
JI Adv. Space Res.
PD SEP 15
PY 2010
VL 46
IS 6
BP 728
EP 734
DI 10.1016/j.asr.2010.04.035
PG 7
WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology &
Atmospheric Sciences
SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences
GA 643KZ
UT WOS:000281296600007
ER
PT J
AU Shvartsburg, AA
Prior, DC
Tang, KQ
Smith, RD
AF Shvartsburg, Alexandre A.
Prior, David C.
Tang, Keqi
Smith, Richard D.
TI High-Resolution Differential Ion Mobility Separations Using Planar
Analyzers at Elevated Dispersion Fields
SO ANALYTICAL CHEMISTRY
LA English
DT Article
ID SPECTROMETRY-MASS-SPECTROMETRY; ESI-FAIMS-MS; GAS-PHASE CONFORMATIONS;
DYNAMIC-RANGE; PROTEOMICS; PEPTIDE; TEMPERATURE; SENSITIVITY;
THROUGHPUT; DISTORTION
AB The ion mobility spectrometry (IMS) methods are grouped into conventional IMS, based on the absolute ion mobility, and differential or field asymmetric waveform IMS (FAIMS), based on mobility differences between strong and weak electric fields. A key attraction of FAIMS is substantial orthogonality to mass spectrometry (MS). Although several FAIMS/MS platforms were commercialized, their utility was limited by FAIMS resolving power, typically similar to 10-20. Recently, gas mixtures comprising up to 75% Ile have enabled resolving power >100 that permits separation of numerous heretofore "coeluting" isomers. This performance opens major new proteomic and other biological applications. Here, we show that raising the separation field by 35% over the previous 21 kV/cm provides similar or better resolution (with resolving powers of >200 for multiply charged peptides) using only 50% He, which avoids problems due to elevated pressure and He content in the mass spectrometer. The heating of ions by the separation field in this regime exceeds that at higher He content but weaker field, inducing greater izomerization of labile species.
C1 [Shvartsburg, Alexandre A.; Prior, David C.; Tang, Keqi; Smith, Richard D.] Pacific NW Natl Lab, Div Biol Sci, Richland, WA 99352 USA.
RP Shvartsburg, AA (reprint author), Pacific NW Natl Lab, Div Biol Sci, POB 999, Richland, WA 99352 USA.
RI Smith, Richard/J-3664-2012
OI Smith, Richard/0000-0002-2381-2349
FU NIH NCRR [RR18522]
FX We thank Ron Moore, Karl Weitz, Rui Zhao, Bill Danielson, and Dr.
Michael Belov for experimental help. This research was supported by NIH
NCRR (Grant RR18522). The work was performed in the Environmental
Molecular Sciences Laboratory, a DoE-BER user facility at PNNL.
NR 56
TC 35
Z9 35
U1 1
U2 21
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0003-2700
J9 ANAL CHEM
JI Anal. Chem.
PD SEP 15
PY 2010
VL 82
IS 18
BP 7649
EP 7655
DI 10.1021/ac101413k
PG 7
WC Chemistry, Analytical
SC Chemistry
GA 648RF
UT WOS:000281710900018
PM 20666414
ER
PT J
AU Jun, SH
Chang, MS
Kim, BC
An, HJ
Lopez-Ferrer, D
Zhao, R
Smith, RD
Lee, SW
Kim, J
AF Jun, Seung-Hyun
Chang, Mun Seock
Kim, Byoung Chan
An, Hyo Jin
Lopez-Ferrer, Daniel
Zhao, Rui
Smith, Richard D.
Lee, Sang-Won
Kim, Jungbae
TI Trypsin Coatings on Electrospun and Alcohol-Dispersed Polymer Nanofibers
for a Trypsin Digestion Column
SO ANALYTICAL CHEMISTRY
LA English
DT Article
ID ONLINE PROTEIN DIGESTION; AMINO-ACID-SEQUENCE; MASS-SPECTROMETRY; YEAST
ENOLASE; PEPTIDE SEPARATION; CAPILLARY-ELECTROPHORESIS; EFFICIENT
PROTEOLYSIS; IDENTIFICATION; PROTEOMICS; INTEGRATION
AB The construction of a trypsin column for rapid and efficient protein digestion in proteomics is described. Electrospun and alcohol-dispersed polymer nanofibers were used for the fabrication of highly stable trypsin coatings, which were prepared by a two-step process of covalent attachment and enzyme cross-linking. In a comparative study with the trypsin coatings on as-spun and nondispersed nanofibers, it has been observed that a simple step of alcohol dispersion improved not only the enzyme loading but also the performance of protein digestion. In-column digestion of enolase was successfully performed in less than 20 min. By applying the alcohol dispersion of polymer nanofibers, the bypass of samples was reduced by filling up the column with well-dispersed nanofibers, and subsequently, interactions between the protein and the trypsin coatings were improved, yielding more complete and reproducible digestions. Regardless of alcohol dispersion or not, trypsin coatings showed better digestion performance and improved performance stability under recycled uses than covalently attached trypsin, in-solution digestion, and commercial trypsin beads. The combination of highly stable trypsin coatings and alcohol dispersion of polymer nanofibers has opened up a new potential to develop a trypsin column for online and automated protein digestion.
C1 [Chang, Mun Seock; Lee, Sang-Won] Korea Univ, Dept Chem, Seoul 136701, South Korea.
[Jun, Seung-Hyun; An, Hyo Jin; Kim, Jungbae] Korea Univ, Dept Chem & Biol Engn, Seoul 136701, South Korea.
[Kim, Byoung Chan] Inst Pasteur Korea, Songnam 463400, Gyeonggi Do, South Korea.
[Lopez-Ferrer, Daniel; Zhao, Rui; Smith, Richard D.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Lee, SW (reprint author), Korea Univ, Dept Chem, 1 5 Ka, Seoul 136701, South Korea.
EM sw_lee@korea.ac.kr; jbkim3@korea.ac.kr
RI Smith, Richard/J-3664-2012; Lee, Sang-Won/H-6760-2013;
OI Smith, Richard/0000-0002-2381-2349; Lee, Sang-Won/0000-0002-5042-0084;
Jun, Seung-Hyun/0000-0002-7978-958X
FU Korean Ministry of Education, Science, and Technology (MEST)
[20090082314, 2009-0059861, 2009-0075638]; 21C Frontier Functional
Proteomics Project [FPR08A1-010]; Ministry of Education, Science and
Technology [2010K001300]; Ministry of Knowledge Economy; NIH National
Center for Research Resources (NCRR) [RR018522]; NIH National Cancer
Institute [R21 CA12619-01]; Pacific Northwest National Laboratory's
(PNNL)
FX Portions of this work were supported by grants from the National
Research Foundation (NIT) funded by the Korean Ministry of Education,
Science, and Technology (MEST; No. 20090082314, No. 2009-0059861, and
No. 2009-0075638). S.L. and M.C. acknowledge 21C Frontier Functional
Proteomics Project (FPR08A1-010) the Converging Research Center Program
(2010K001300) through the Ministry of Education, Science and Technology,
and the Fundamental R&D Program for Core Technology of Materials funded
by the Ministry of Knowledge Economy. D.L.-F. and R.D.S. also
acknowledge the NIH National Center for Research Resources (NCRR,
RR018522), NIH National Cancer Institute (R21 CA12619-01), and the
Pacific Northwest National Laboratory's (PNNL) Laboratory Directed
Research and Development Program.
NR 35
TC 19
Z9 20
U1 2
U2 28
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0003-2700
J9 ANAL CHEM
JI Anal. Chem.
PD SEP 15
PY 2010
VL 82
IS 18
BP 7828
EP 7834
DI 10.1021/ac101633e
PG 7
WC Chemistry, Analytical
SC Chemistry
GA 648RF
UT WOS:000281710900042
PM 20718428
ER
PT J
AU Finnegan, S
Yuan, HL
Wang, YF
Orville, AM
Weber, IT
Gadda, G
AF Finnegan, Steffan
Yuan, Hongling
Wang, Yuan-Fang
Orville, Allen M.
Weber, Irene T.
Gadda, Giovanni
TI Structural and kinetic studies on the Ser101Ala variant of choline
oxidase: Catalysis by compromise
SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
LA English
DT Article
DE Oxidase; Flavoprotein; Kinetics; Mechanism; Reductive half-reaction;
Choline
ID ARTHROBACTER-GLOBIFORMIS; HYDRIDE TRANSFER; TOLERANCE; SUBSTRATE;
MECHANISM; BINDING
AB The oxidation of choline catalyzed by choline oxidase includes two reductive half-reactions where FAD is reduced by the alcohol substrate and by an aldehyde intermediate transiently formed in the reaction Each reductive half-reaction is followed by an oxidative half-reaction where the reduced Flavin is oxidized by oxygen Here, we have used mutagenesis to prepare the Ser101Ala mutant of choline oxidase and have investigated the impact of this mutation on the structural and kinetic properties of the enzyme The crystallographic structure of the Ser101Ala enzyme indicates that the only differences between the mutant and wild-type enzymes are the lack of a hydroxyl group on residue 101 and a more planar configuration of the flavin in the mutant enzyme Kinetics established that replacement of Ser101 with alanine yields a mutant enzyme with increased efficiencies in the oxidative half-reactions and decreased efficiencies in the reductive half-reactions This is accompanied by a significant decrease in the overall rate of turnover with choline Thus, this mutation has revealed the importance of a specific residue for the optimization of the overall turnover of choline oxidase, which requires fine-tuning of four consecutive half-reactions for the conversion of an alcohol to a carboxylic acid (C) 2010 Elsevier Inc All rights reserved
C1 [Finnegan, Steffan; Yuan, Hongling; Weber, Irene T.; Gadda, Giovanni] Georgia State Univ, Dept Chem, Atlanta, GA 30302 USA.
[Wang, Yuan-Fang; Weber, Irene T.; Gadda, Giovanni] Georgia State Univ, Dept Biol, Atlanta, GA 30302 USA.
[Weber, Irene T.; Gadda, Giovanni] Georgia State Univ, Ctr Biotechnol & Drug Design, Atlanta, GA 30302 USA.
[Orville, Allen M.] Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA.
RP Gadda, G (reprint author), Georgia State Univ, Dept Chem, POB 4098, Atlanta, GA 30302 USA.
FU US Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-ACO2-98CH10886]
FX Use of the National Synchrotron Light Source, Brookhaven National
Laboratory, was supported by the US Department of Energy, Office of
Science, Office of Basic Energy Sciences, under Contract No.
DE-ACO2-98CH10886.
NR 26
TC 12
Z9 13
U1 0
U2 4
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0003-9861
J9 ARCH BIOCHEM BIOPHYS
JI Arch. Biochem. Biophys.
PD SEP 15
PY 2010
VL 501
IS 2
BP 207
EP 213
DI 10.1016/j.abb.2010.06.014
PG 7
WC Biochemistry & Molecular Biology; Biophysics
SC Biochemistry & Molecular Biology; Biophysics
GA 647KD
UT WOS:000281616500006
PM 20561507
ER
PT J
AU Lin, G
Li, DY
Chidawanyika, T
Nathan, C
Li, HL
AF Lin, Gang
Li, Dongyang
Chidawanyika, Tamutenda
Nathan, Carl
Li, Huilin
TI Fellutamide B is a potent inhibitor of the Mycobacterium tuberculosis
proteasome
SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
LA English
DT Article
DE Mycobacterium tuberculosis; Proteasome; Slow-binding inhibition; Peptide
aldehyde; Fellutamide B; Enzyme conformational change
ID 20S PROTEASOME; PROTEIN-DEGRADATION; ALDEHYDES; PEPTIDES; DISTINCT
AB Via high-throughput screening of a natural compound library, we have identified a lipopeptide aldehyde, fellutamide B (1), as the most potent inhibitor of the Mycobacterium tuberculosis (Mtb) proteasome tested to date Kinetic studies reveal that 1 inhibits both Mtb and human proteasomes in a time-dependent manner under steady-state condition Remarkably, 1 inhibits the Mtb proteasome in a single-step binding mechanism with K(1) = 68 nM, whereas it inhibits the human proteasome beta 5 active site following a two-step mechanism with K(1) = 11 5 nM and K(1) = 0.93 nM Co-crystallization of 1 bound to the Mtb proteasome revealed a structural basis for the tight binding of 1 to the active sites of the Mtb proteasome The hemiacetal group of 1 in the Mtb proteasome takes the (R)-configuration, whereas in the yeast proteasome it takes the (S)-configuration, indicating that the pre-chiral CHO group of 1 binds to the active site Thr1 in a different orientation Re-examination of the structure of the yeast proteasome in complex with 1 showed significant conformational changes at the substrate-binding cleft along the active site These structural differences are consistent with the different kinetic mechanisms of 1 against Mtb and human proteasomes (C) 2010 Elsevier Inc All rights reserved
C1 [Lin, Gang; Chidawanyika, Tamutenda; Nathan, Carl] Cornell Univ, Dept Microbiol & Immunol, Weill Med Coll, New York, NY 10065 USA.
[Li, Dongyang; Li, Huilin] Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA.
[Li, Huilin] SUNY Stony Brook, Dept Biochem & Cell Biol, Stony Brook, NY 11794 USA.
RP Lin, G (reprint author), Cornell Univ, Dept Microbiol & Immunol, Weill Med Coll, 1300 York Ave, New York, NY 10065 USA.
FU Milstein Program in Chemical Biology of Infectious Diseases; Bill and
Melinda Gates Foundation; US DOE; William Randolph Hearst Foundation;
[NIH P01-A1056293]; [NIH R01A1070285]
FX Supported by NIH P01-A1056293, NIH R01A1070285 and the Milstein Program
in Chemical Biology of Infectious Diseases. A TB Drug Accelerator grant
from the Bill and Melinda Gates Foundation supported the purchase of the
natural product library. We thank Dr. F. Glickman and R. Realubit of the
High-Throughput Screening Resource Facility for their help and Drs. L.
Dick and C. Tsu (Millennium Pharmaceuticals Inc., Boston, MA) for
donation of N-Ac-Leu-Leu-Xaa-aldehydes X-ray diffraction data were
collected at beam-lines X6A, X25, and X29 in the National Synchrotron
Light Source, a facility supported by US DOE and NIH The Department of
Microbiology and Immunology is supported by the William Randolph Hearst
Foundation.
NR 29
TC 27
Z9 31
U1 5
U2 15
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0003-9861
J9 ARCH BIOCHEM BIOPHYS
JI Arch. Biochem. Biophys.
PD SEP 15
PY 2010
VL 501
IS 2
BP 214
EP 220
DI 10.1016/j.abb.2010.06
PG 7
WC Biochemistry & Molecular Biology; Biophysics
SC Biochemistry & Molecular Biology; Biophysics
GA 647KD
UT WOS:000281616500007
PM 20558127
ER
PT J
AU Crochet, AP
Kabir, MM
Francis, MB
Paavola, CD
AF Crochet, Amanda P.
Kabir, Mohiuddin M.
Francis, Matthew B.
Paavola, Chad D.
TI Site-selective dual modification of periplasmic binding proteins for
sensing applications
SO BIOSENSORS & BIOELECTRONICS
LA English
DT Article
DE Periplasmic binding proteins (PBPs); Glutamine binding protein;
Reagentless sensor; Fluorescence resonance energy transfer (FRET);
Transamination
ID RESONANCE ENERGY-TRANSFER; FLUORESCENT NANOSENSORS; TRANSPORT-SYSTEMS;
CELLS; TRANSAMINATION; CONSTRUCTION; BIOSENSOR; RELEASE; SENSORS; FAMILY
AB We have developed three sensitive and specific amino acid sensors based on bacterial periplasmic solute binding proteins A site-specific amino-terminal transamination reaction provides a useful complement to cysteine chemistry for the covalent modification of biomolecules in this application. We demonstrate this combination to attach two different chromophores to a single biomolecule in two locations The periplasmic glutamine binding protein from E colt was modified with a pair of dyes suitable for fluorescence resonance energy transfer, and this conjugate exhibited an L-glutamine dependent optical response Two periplasmic binding proteins from the thermophilic organism Thermotoga maritima, for arginine and aliphatic amino acids, were modified and evaluated similarly. All three conjugates manifested signal changes mediated by resonant energy transfer upon binding their respective ligands, with nanomolar dissociation constants and stereochemical specificity This represents a readily generalizable method for construction of reagentless biosensors The double-labeling strategy was also exploited for the surface attachment of a dye-labeled glutamine binding protein via a biotin-streptavidin interaction. Published by Elsevier B.V.
C1 [Paavola, Chad D.] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA.
[Crochet, Amanda P.; Francis, Matthew B.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Crochet, Amanda P.; Francis, Matthew B.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
[Kabir, Mohiuddin M.] SETI Inst, Mountain View, CA 94043 USA.
RP Paavola, CD (reprint author), NASA, Ames Res Ctr, Mail Stop 239-15, Moffett Field, CA 94035 USA.
FU National Aeronautics and Space Administration [ASTID04-0000-0108,
07-ASTID07-0092]
FX This work was supported by National Aeronautics and Space
Administration, Astrobiology Science and Technology Instrument
Development program grants ASTID04-0000-0108 and 07-ASTID07-0092.
NR 32
TC 8
Z9 9
U1 0
U2 6
PU ELSEVIER ADVANCED TECHNOLOGY
PI OXFORD
PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON,
OXFORD OX5 1GB, OXON, ENGLAND
SN 0956-5663
J9 BIOSENS BIOELECTRON
JI Biosens. Bioelectron.
PD SEP 15
PY 2010
VL 26
IS 1
BP 55
EP 61
DI 10.1016/j.bios.2010.05.012
PG 7
WC Biophysics; Biotechnology & Applied Microbiology; Chemistry, Analytical;
Electrochemistry; Nanoscience & Nanotechnology
SC Biophysics; Biotechnology & Applied Microbiology; Chemistry;
Electrochemistry; Science & Technology - Other Topics
GA 659IP
UT WOS:000282560500009
PM 20541393
ER
PT J
AU Haynes, DJ
Campos, A
Smith, MW
Berry, DA
Shekhawat, D
Spivey, JJ
AF Haynes, Daniel J.
Campos, Andrew
Smith, Mark W.
Berry, David A.
Shekhawat, Dushyant
Spivey, James J.
TI Reducing the deactivation of Ni-metal during the catalytic partial
oxidation of a surrogate diesel fuel mixture
SO CATALYSIS TODAY
LA English
DT Article; Proceedings Paper
CT 11th Internation Symposium on Catalyst Deactivation
CY OCT 25-28, 2009
CL Delft, NETHERLANDS
DE Pyrochlore; Hexaaluminate; Nickel; Logistic fuel reforming; Partial
oxidation catalyst
ID BEARING SILICATE GLASSES/MELTS; HYDROGEN-PRODUCTION;
TRANSITION-ELEMENTS; NI-AL2O3 CATALYSTS; CARBON DEPOSITION; SUPPORTED
NI; METHANE; TETRADECANE; ISOOCTANE; SULFUR
AB Ni catalysts are active and selective for the conversion of hydrocarbon into synthesis gas. However, conventional supported Ni catalysts rapidly deactivate at the high temperatures required for partial oxidation of diesel fuel by sintering and metal vaporization, as well as by carbon deposition and sulfur poisoning. Thus, to reduce deactivation Ni (3 wt%) was substituted into the structures of Ba-hexaaluminate (BNHA) and La-Sr-Zr pyrochlore (LSZN), and their activity was compared to a supported Ni/Al(2)O(3) for the catalytic partial oxidation (CPOX) of a surrogate diesel fuel. Characterization by XRD showed a single phase beta-alumina for the hexaaluminate, while LSZN had a pyrochlore structure with a defect SrZrO(3) perovskite phase. Temperature programmed reduction experiments confirmed Ni was reducible in all catalysts. XANES results confirmed that Ni atoms were substituted into the hexaaluminate and pyrochlore structures, as spectra for each catalyst showed different coordination environments for Ni compared to a NiO standard. During CPOX activity tests (T = 900 degrees C and WHSV= 50,000 scc/g(cat)/h), the LSZN pyrochlore produced stable H(2) and CO yields in the presence of 5 wt% 1-methylnaphthalene and 50ppmw dibenzothiophene/n-tetradecane for 2 h, while both Ni/Al(2)O(3) and BNHA catalysts were irreversibly deactivated by this mixture over the same time. Activity loss was strongly linked to carbon formation. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Haynes, Daniel J.; Berry, David A.; Shekhawat, Dushyant] US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA.
[Haynes, Daniel J.] URS Washington Div, Morgantown, WV 26505 USA.
[Campos, Andrew; Spivey, James J.] Louisiana State Univ, Dept Chem Engn, Baton Rouge, LA 70803 USA.
[Smith, Mark W.] REM Engn Serv, Morgantown, WV 26505 USA.
RP Haynes, DJ (reprint author), US DOE, Natl Energy Technol Lab, 3610 Collins Ferry Rd, Morgantown, WV 26507 USA.
EM Daniel.Haynes@ur.netl.doe.gov
NR 44
TC 16
Z9 16
U1 1
U2 7
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0920-5861
J9 CATAL TODAY
JI Catal. Today
PD SEP 15
PY 2010
VL 154
IS 3-4
BP 210
EP 216
DI 10.1016/j.cattod.2010.03.072
PG 7
WC Chemistry, Applied; Chemistry, Physical; Engineering, Chemical
SC Chemistry; Engineering
GA 647GW
UT WOS:000281607400006
ER
PT J
AU Kessler, SH
Smith, JD
Che, DL
Worsnop, DR
Wilson, KR
Kroll, JH
AF Kessler, Sean H.
Smith, Jared D.
Che, Dung L.
Worsnop, Douglas R.
Wilson, Kevin R.
Kroll, Jesse H.
TI Chemical Sinks of Organic Aerosol: Kinetics and Products of the
Heterogeneous Oxidation of Erythritol and Levoglucosan
SO ENVIRONMENTAL SCIENCE & TECHNOLOGY
LA English
DT Article
ID MASS-SPECTROMETRY; SECONDARY; PHOTOOXIDATION; PARTICLES; ISOPRENE;
RADICALS
AB The heterogeneous oxidation of pure erythritol (C(4)H(10)O(4)) and levoglucosan (C(6)H(10)O(5)) particles was studied in order to evaluate the effects of atmospheric aging on the mass and chemical composition of atmospheric organic aerosol. In contrast to what is generally observed for the heterogeneous oxidation of reduced organics, substantial volatilization is observed in both systems. However, the ratio of the decrease in particle mass to the decrease in the concentration of the parent species is about three times higher for erythritol than for levoglucosan, indicating that details of chemical structure (such as carbon number, cyclic moieties, and oxygen-containing functional groups) play a governing role in the importance of volatilization reactions. The kinetics of the reaction indicate that while both compounds react at approximately the same rate, reactions of their oxidation products appear to be slowed substantially. Estimates of volatilities of organic species based on elemental composition measurements suggest that the heterogeneous oxidation of oxygenated organics may be an important loss mechanism of organic aerosol.
C1 [Kessler, Sean H.; Kroll, Jesse H.] MIT, Dept Chem Engn, Cambridge, MA 02139 USA.
[Smith, Jared D.; Che, Dung L.; Wilson, Kevin R.] Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA.
[Che, Dung L.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Worsnop, Douglas R.] Aerodyne Res Inc, Ctr Aerosol & Cloud Chem, Billerica, MA 01821 USA.
[Kroll, Jesse H.] MIT, Dept Civil & Environm Engn, Cambridge, MA 02139 USA.
RP Kroll, JH (reprint author), MIT, Dept Chem Engn, Cambridge, MA 02139 USA.
EM jhkroll@mit.edu
RI Worsnop, Douglas/D-2817-2009
OI Worsnop, Douglas/0000-0002-8928-8017
NR 28
TC 75
Z9 75
U1 5
U2 59
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 SEP 15
PY 2010
VL 44
IS 18
BP 7005
EP 7010
DI 10.1021/es101465m
PG 6
WC Engineering, Environmental; Environmental Sciences
SC Engineering; Environmental Sciences & Ecology
GA 647PD
UT WOS:000281629800018
PM 20707414
ER
PT J
AU Um, W
Zachara, JM
Liu, CX
Moore, DA
Rod, KA
AF Um, Wooyong
Zachara, John M.
Liu, Chongxuan
Moore, Dean A.
Rod, Kenton A.
TI Resupply mechanism to a contaminated aquifer: A laboratory study of
U(VI) desorption from capillary fringe sediments
SO GEOCHIMICA ET COSMOCHIMICA ACTA
LA English
DT Article
ID SURFACE COMPLEXATION MODEL; URANIUM(VI) ADSORPTION; HANFORD SEDIMENTS;
VADOSE ZONE; GEOCHEMICAL CONDITIONS; REACTIVE TRANSPORT; TERNARY
COMPLEXES; POROUS-MEDIA; WATER-FLOW; SORPTION
AB Contaminated capillary fringe sediments are believed to function as long-term source of U(VI) to Hanford's 300 Area groundwater uranium plume that discharges to the Columbia River. The deep vadose zone at this site experiences seasonal water table elevation and water compositional changes in response to Columbia River stage. Batch and column desorption experiments of U(VI) were performed on two mildly contaminated sediments from this system that vary in hydrologic position to ascertain their U(VI) release behavior and factors controlling it. Solid phase characterization of the sediments was performed to identify mineralogic and chemical factors controlling U(VI) desorption. Low adsorbed U(VI) concentrations prevented spectroscopic analysis. The desorption behavior of U(VI) was different for the two sediments in spite of similar chemical and textural characteristics, and non-carbonate mineralogy. Adsorption strength and sorbed U(VI) lability was higher in the near-river sediment. The inland sediment displayed low sorbed U(VI) lability (similar to 10%) and measurable solid-phase carbonate content. Kinetic desorption was observed that was attributed to regeneration of labile U(VI) in the near river sediment, and carbonate mineral dissolution in the inland sediment. The desorption reaction was best described as an equilibrium surface complexation reaction. The noted differences in desorption behavior appear to result from U(VI) contamination and hydrologic history, as well as sediment carbonate content. Insights are provided on the dynamic adsorption/desorption behavior of contaminants in linked groundwater river systems. (C) 2010 Published by Elsevier Ltd.
C1 [Um, Wooyong; Zachara, John M.; Liu, Chongxuan; Moore, Dean A.; Rod, Kenton A.] Pacific NW Natl Lab, Richland, WA 99354 USA.
RP Zachara, JM (reprint author), Pacific NW Natl Lab, POB 999,MS K8-96, Richland, WA 99354 USA.
EM john.zachara@pnl.gov
RI Liu, Chongxuan/C-5580-2009
FU U.S. Department of Energy, Office of Biological and Environmental
Research (BER); U.S. Department of Energy, Office of Biological and
Environmental Research (BER) through the Hanford Integrated Field
Research Challenge (IFRC) and PNNL SFA
FX This work was supported by the U.S. Department of Energy, Office of
Biological and Environmental Research (BER) through the Hanford
Integrated Field Research Challenge (IFRC) and PNNL SFA. Vadose zone
samples were provided by the EM-40 Limited Field Investigation (LFI).
Paul Gassman, Eric Clayton, and Steven Baum are acknowledged for their
contribution to sample preparation and analyses. Pacific Northwest
National Laboratory is operated for the DOE by Battelle. Three
insightful reviews served to enhance the presentation in this final
manuscript.
NR 63
TC 14
Z9 14
U1 1
U2 11
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0016-7037
J9 GEOCHIM COSMOCHIM AC
JI Geochim. Cosmochim. Acta
PD SEP 15
PY 2010
VL 74
IS 18
BP 5155
EP 5170
DI 10.1016/j.gca.2010.02.001
PG 16
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 641AE
UT WOS:000281094900001
ER
PT J
AU Oster, JL
Montanez, IP
Guilderson, TP
Sharp, WD
Banner, JL
AF Oster, Jessica L.
Montanez, Isabel P.
Guilderson, Thomas P.
Sharp, Warren D.
Banner, Jay L.
TI Modeling speleothem delta C-13 variability in a central Sierra Nevada
cave using C-14 and Sr-87/Sr-86
SO GEOCHIMICA ET COSMOCHIMICA ACTA
LA English
DT Article
ID SOUTHWESTERN UNITED-STATES; STABLE-ISOTOPE VARIATIONS; HIGH-RESOLUTION;
TRACE-ELEMENT; LATE PLEISTOCENE; CARBON-DIOXIDE; OXYGEN-ISOTOPE;
NORTH-ATLANTIC; CLIMATE-CHANGE; YOUNGER DRYAS
AB Carbon isotopes in speleothems can vary in response to a number of complex processes active in cave systems that are both directly and indirectly related to climate. Progressing downward from the soil zone overlying the cave, these processes include soil respiration, fluid-rock interaction in the host limestone, degassing of CO2 and precipitation of calcite upflow from the speleothem drip site, and calcite precipitation at the drip site. Here we develop a new approach to independently constrain the roles of water-rock interaction and soil processes in controlling stalagmite delta C-13. This approach uses the dead carbon proportion (dcp) estimated from coupled C-14 and Th-230/U measurements, in conjunction with Sr isotope analyses on stalagmite calcite from a central Sierra Nevada foothills cave in California, a region characterized by a highly seasonal Mediterranean-type climate, to determine the roles of water-rock interaction and soil processes in determining stalagmite delta C-13. Increases in stalagmite dcp between 16.5 and 8.8 ka are coincident with decreased delta C-13, indicating a varying yet substantial contribution from the soil organic matter (SOM) reservoir, likely due to significantly increased average age of SOM in the soil veneer above the cave during wet climatic intervals.
We use geochemical and isotope mixing models to estimate the host-carbonate contribution throughout the delta C-13 time series and determine the degree of degassing and calcite precipitation that occurred prior to precipitation of stalagmite calcite. The degree of degassing and prior calcite precipitation we calculate varies systematically with other climate indicators, with less degassing and prior calcite precipitation occurring during wetter climatic intervals and more during drier intervals. Modeled delta C-13 values and degassing calculations suggest that some degree of prior calcite precipitation is necessary at all time intervals to explain measured stalagmite delta C-13 values, even during relatively wet intervals. These results illustrate the importance of constraining degassing and prior calcite precipitation in the interpretation of speleothem delta C-13 records, particularly those from caves that formed in seasonal semi-arid to arid environments. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Oster, Jessica L.; Montanez, Isabel P.] Univ Calif Davis, Dept Geol, Davis, CA 95616 USA.
[Guilderson, Thomas P.] Lawrence Livermore Natl Lab, Ctr AMS, Livermore, CA USA.
[Sharp, Warren D.] Berkeley Geochronol Ctr, Berkeley, CA USA.
[Guilderson, Thomas P.] Univ Calif Santa Cruz, Inst Marine Sci, Santa Cruz, CA 95064 USA.
[Banner, Jay L.] Univ Texas Austin, Austin, TX 78712 USA.
RP Oster, JL (reprint author), Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA.
EM jloster@stanford.edu
RI Banner, Jay/C-8676-2011;
OI Oster, Jessica/0000-0002-1780-2435
FU Cave Research Foundation; NSF [NSF-ATM0823656, NSF-ATM0823541, NSF
ATM-0823665]
FX This work was supported by a Cave Research Foundation student Grant to
Jessica Oster and NSF Grants NSF-ATM0823656 to Isabel P. Montanez.
NSF-ATM0823541 to Warren D. Sharp and NSF ATM-0823665 to Jay L. Banner.
NR 78
TC 30
Z9 34
U1 0
U2 16
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 SEP 15
PY 2010
VL 74
IS 18
BP 5228
EP 5242
DI 10.1016/j.gca.2010.06.030
PG 15
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 641AE
UT WOS:000281094900006
ER
PT J
AU Kelemen, SR
Walters, CC
Kwiatek, PJ
Freund, H
Afeworki, M
Sansone, M
Lamberti, WA
Pottorf, RJ
Machel, HG
Peters, KE
Bolin, T
AF Kelemen, Simon R.
Walters, Clifford C.
Kwiatek, Peter J.
Freund, Howard
Afeworki, Mobae
Sansone, Michael
Lamberti, William A.
Pottorf, Robert J.
Machel, Hans G.
Peters, Kenneth E.
Bolin, Trudy
TI Characterization of solid bitumens originating from thermal chemical
alteration and thermochemical sulfate reduction
SO GEOCHIMICA ET COSMOCHIMICA ACTA
LA English
DT Article
ID ARGONNE PREMIUM COALS; RAY PHOTOELECTRON-SPECTROSCOPY; CANADA
SEDIMENTARY BASIN; ORGANIC SULFUR FORMS; WESTERN CANADA; X-RAY;
CARBONATE RESERVOIRS; SMACKOVER FORMATION; SOUTHEAST MISSOURI;
HYDROCARBON GASES
AB Solid bitumen can arise from several reservoir processes acting on migrated petroleum. Insoluble solid organic residues can form by oxidative processes associated with thermochemical sulfate reduction (TSR) as well as by thermal chemical alteration (TCA) of petroleum. TCA may follow non-thermal processes, such as biodegradation and asphaltene precipitation, that produce viscous fluids enriched in polar compounds that are then altered into solid bitumens. It is difficult to distinguish solid bitumen formed by TCA from TSR since both processes occur under relatively high temperatures. The focus of the present work is to characterize solid bitumen samples associated with TSR- or TCA-processes using a combination of solid-state X-ray Photoelectron Spectroscopy (XPS), Sulfur X-ray Absorption Near Edge Structure Spectroscopy (S-XANES), and (13)C NMR. Naturally occurring solid bitumens from three locations, Nisku Formation, Brazeau River area (TSR-related); La Barge Field, Madison Formation (TSR-related); and, the Alaskan North Slope, Brooks Range (TCA-related), are compared to solid bitumens generated in laboratory simulations of TSR and TCA.
The chemical nature of solid bitumens with respect to organic nitrogen and sulfur can be understood in terms of (1) the nature of hydrocarbon precursor molecules, (2) the mode of sulfur incorporation, and (3) their concentration during thermal stress. TSR-solid bitumen is highly aromatic, sulfur-rich, and nitrogen-poor. These heteroatom distributions are attributed to the ability of TSR to incorporate copious amounts of inorganic sulfur (S/C atomic ratio >0.035) into aromatic structures and to initial low levels of nitrogen in the unaltered petroleum. In contrast, TCA-solid bitumen is derived from polar materials that are initially rich in sulfur and nitrogen. Aromaticity and nitrogen increase as thermal stress cleaves aliphatic moieties and condensation reactions take place. TCA-bitumens from the Brooks Range have <75% aromatic carbon. TCA-bitumens exposed to greater thermal stress can have a higher aromaticity, like that observed in TSR-bitumens. Organic sulfur in TCA-organic solids remains relatively constant with increasing maturation (S/C atomic ratio <0.035) due to offsetting preservation and H(2)S elimination reactions. Although S-XANES and (13)C NMR provide information needed to understand changes in structure and reactivity that occur in the formation of petroleum solids, in some cases XPS analysis is sufficient to determine whether a solid bitumen is formed by TCA or TSR. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Kelemen, Simon R.; Walters, Clifford C.; Kwiatek, Peter J.; Freund, Howard; Afeworki, Mobae; Sansone, Michael; Lamberti, William A.] ExxonMobil Res & Engn Co, Annandale, NJ 08801 USA.
[Pottorf, Robert J.] ExxonMobil Upstream Res Co, Houston, TX 77252 USA.
[Machel, Hans G.] Univ Alberta, Edmonton, AB T6G 2E3, Canada.
[Peters, Kenneth E.] Schlumberger Informat Solut, Mill Valley, CA 94941 USA.
[Bolin, Trudy] Argonne Natl Lab, Argonne, IL 60439 USA.
RP Walters, CC (reprint author), ExxonMobil Res & Engn Co, 1545 Route 22 E, Annandale, NJ 08801 USA.
EM clifford.c.walters@exxonmobil.com
OI Walters, Clifford/0000-0002-4654-0139
FU U.S. Department of Energy, Basic Energy Sciences, Office of Science
[W-31-109-Eng-38]
FX The authors wish to thank Robert C. Burruss and two anonymous reviewers
for their thoughtful and constructive comments and ExxonMobil Research &
Engineering for granting permission to publish this paper. Use of the
Advanced Photon Source was supported by the U.S. Department of Energy,
Basic Energy Sciences, Office of Science, under contract No.
W-31-109-Eng-38.
NR 87
TC 34
Z9 37
U1 3
U2 27
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0016-7037
J9 GEOCHIM COSMOCHIM AC
JI Geochim. Cosmochim. Acta
PD SEP 15
PY 2010
VL 74
IS 18
BP 5305
EP 5332
DI 10.1016/j.gca.2010.06.013
PG 28
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 641AE
UT WOS:000281094900011
ER
PT J
AU Le Clainche, Y
Vezina, A
Levasseur, M
Cropp, RA
Gunson, JR
Vallina, SM
Vogt, M
Lancelot, C
Allen, JI
Archer, SD
Bopp, L
Deal, C
Elliott, S
Jin, M
Malin, G
Schoemann, V
Simo, R
Six, KD
Stefels, J
AF Le Clainche, Yvonnick
Vezina, Alain
Levasseur, Maurice
Cropp, Roger A.
Gunson, Jim R.
Vallina, Sergio M.
Vogt, Meike
Lancelot, Christiane
Allen, J. Icarus
Archer, Stephen D.
Bopp, Laurent
Deal, Clara
Elliott, Scott
Jin, Meibing
Malin, Gill
Schoemann, Veronique
Simo, Rafel
Six, Katharina D.
Stefels, Jacqueline
TI A first appraisal of prognostic ocean DMS models and prospects for their
use in climate models
SO GLOBAL BIOGEOCHEMICAL CYCLES
LA English
DT Article
ID DIMETHYL SULFIDE; SULFUR EMISSIONS; SARGASSO SEA; ATMOSPHERIC SULFUR;
NORTHEAST PACIFIC; SURFACE OCEAN; GAS-EXCHANGE;
DIMETHYLSULFONIOPROPIONATE; PHYTOPLANKTON; FLUX
AB Ocean dimethylsulfide (DMS) produced by marine biota is the largest natural source of atmospheric sulfur, playing a major role in the formation and evolution of aerosols, and consequently affecting climate. Several dynamic process-based DMS models have been developed over the last decade, and work is progressing integrating them into climate models. Here we report on the first international comparison exercise of both 1D and 3D prognostic ocean DMS models. Four global 3D models were compared to global sea surface chlorophyll and DMS concentrations. Three local 1D models were compared to three different oceanic stations (BATS, DYFAMED, OSP) where available time series data offer seasonal coverage of chlorophyll and DMS variability. Two other 1D models were run at one site only. The major point of divergence among models, both within 3D and 1D models, relates to their ability to reproduce the summer peak in surface DMS concentrations usually observed at low to mid- latitudes. This significantly affects estimates of global DMS emissions predicted by the models. The inability of most models to capture this summer DMS maximum appears to be constrained by the basic structure of prognostic DMS models: dynamics of DMS and dimethylsulfoniopropionate (DMSP), the precursor of DMS, are slaved to the parent ecosystem models. Only the models which include environmental effects on DMS fluxes independently of ecological dynamics can reproduce this summer mismatch between chlorophyll and DMS. A major conclusion of this exercise is that prognostic DMS models need to give more weight to the direct impact of environmental forcing (e. g., irradiance) on DMS dynamics to decouple them from ecological processes.
C1 [Allen, J. Icarus; Archer, Stephen D.] Plymouth Marine Lab, Plymouth PL1 3DH, Devon, England.
[Bopp, Laurent] IPSL, LSCE, F-91191 Gif Sur Yvette, France.
[Cropp, Roger A.] Griffith Univ, Atmospher Environm Res Ctr, Griffith Sch Environm, Nathan, Qld 4111, Australia.
[Deal, Clara; Jin, Meibing] Univ Alaska Fairbanks, Int Arctic Res Ctr, Fairbanks, AK 99775 USA.
[Elliott, Scott] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Gunson, Jim R.] CSIRO Marine & Atmospher Res, Hobart, Tas 7000, Australia.
[Lancelot, Christiane; Schoemann, Veronique] Univ Libre Bruxelles, B-1050 Brussels, Belgium.
[Le Clainche, Yvonnick; Levasseur, Maurice] Univ Laval, Dept Biol, Quebec City, PQ G1V 0A6, Canada.
[Vogt, Meike; Malin, Gill] Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England.
[Vallina, Sergio M.; Simo, Rafel] CSIC, ICM, E-08003 Barcelona, Spain.
[Six, Katharina D.] Max Planck Inst Meteorol, D-20146 Hamburg, Germany.
[Stefels, Jacqueline] Univ Groningen, Dept Plant Ecophysiol, NL-9750 AA Haren, Netherlands.
[Vezina, Alain] Fisheries & Oceans Canada, BIO, Dartmouth, NS B2Y 4A2, Canada.
RP Le Clainche, Y (reprint author), Univ Quebec, Inst Sci Mer Rimouski, Rimouski, PQ G5L 3A1, Canada.
EM yvonnick_leclainche@uqar.ca
RI Jin, Meibing/F-7666-2010; Le Clainche, Yvonnick/G-2933-2010; Cropp,
Roger/C-1019-2008; Archer, Stephen/H-5490-2012; Monahan,
Adam/J-9895-2012; Malin, Gill/C-6985-2009
OI Cropp, Roger/0000-0001-9582-857X; Malin, Gill/0000-0002-3639-9215
FU National Sciences and Engineering Research Council of Canada; Canadian
Foundation for Climate and Atmospheric Sciences; U.K. Natural
Environmental Research Council; North Pacific Research Board; European
Research and Training Network GREENCYCLES; Australian Research Council;
EU; U.S. Department of Energy Office of Biology and Environmental
Research and the Spanish MEC
FX We thank Surface Ocean Lower Atmosphere Study (SOLAS) and the Belgian
Federal Science Policy Office for supporting the workshop. Support for
participation of individual participants was provided by the National
Sciences and Engineering Research Council of Canada and the Canadian
Foundation for Climate and Atmospheric Sciences, the U.K. Natural
Environmental Research Council Advanced Research Fellowship, the North
Pacific Research Board Project, the European Research and Training
Network GREENCYCLES, the Australian Research Council, the EU 6th
Framework Programme, the U.S. Department of Energy Office of Biology and
Environmental Research and the Spanish MEC. Finally, we thank everyone
in the DMS community who has contributed data to the Global Surface
Seawater Dimethylsulfide (DMS) Database.
NR 51
TC 26
Z9 26
U1 0
U2 19
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0886-6236
J9 GLOBAL BIOGEOCHEM CY
JI Glob. Biogeochem. Cycle
PD SEP 15
PY 2010
VL 24
AR GB3021
DI 10.1029/2009GB003721
PG 13
WC Environmental Sciences; Geosciences, Multidisciplinary; Meteorology &
Atmospheric Sciences
SC Environmental Sciences & Ecology; Geology; Meteorology & Atmospheric
Sciences
GA 652MG
UT WOS:000282010300002
ER
PT J
AU Fleming, RM
Seager, CH
Lang, DV
Campbell, JM
AF Fleming, R. M.
Seager, C. H.
Lang, D. V.
Campbell, J. M.
TI Annealing neutron damaged silicon bipolar transistors: Relating gain
degradation to specific lattice defects
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
DE annealing; bipolar transistors; deep level transient spectroscopy;
elemental semiconductors; silicon
ID JUNCTION TRANSISTORS; RECOMBINATION; RADIATION
AB Isochronal anneal sequences have been carried out on pnp and npn transistors irradiated with fast neutrons at a variety of fluences. The evolution of base and collector currents was utilized to characterize the annealing behavior of defects in both the emitter-base depletion region and the neutral base. Various annealing biases, theoretical modeling, as well as previous deep level transient spectroscopy (DLTS) data, were used to assign the relative magnitude of each of the important defects to the total recombination current. We find that donor-vacancy pairs in the neutral n-type base of our pnp transistors are responsible for about 1/3 of the postdamage lifetime degradation, while the remaining recombination currents can be largely attributed to a cluster-related divacancylike defect which has no shallow state DLTS emission peak. This latter defect anneals gradually from 350 to 590 K. Generation/recombination currents in the base-emitter junctions in both types of devices were found to anneal in a similar, gradual fashion, suggesting that this same cluster-related intrinsic lattice defect is also responsible for the large, damage-induced base currents. (C) 2010 American Institute of Physics. [doi:10.1063/1.3480798]
C1 [Fleming, R. M.; Seager, C. H.; Lang, D. V.; Campbell, J. M.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Fleming, RM (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM rmflemi@sandia.gov
RI Fleming, Robert/B-1248-2008
FU U.S. Department of Energy's National Nuclear Security Administration
[DE-AC04-94AL85000]
FX We thank Ed Bielejec, Chuck Hembree, Don King, Kyle McDonald, Sam Myers,
Peter Schultz, Bill Wampler, Alan Wright, and George Vizkelethy for
stimulating discussions. Sandia National Laboratories is a multiprogram
laboratory operated by Sandia Corporation, a wholly owned subsidiary of
Lockheed Martin company, for the U.S. Department of Energy's National
Nuclear Security Administration under Contract No. DE-AC04-94AL85000.
NR 22
TC 7
Z9 7
U1 0
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 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD SEP 15
PY 2010
VL 108
IS 6
AR 063716
DI 10.1063/1.3480798
PG 7
WC Physics, Applied
SC Physics
GA 660MD
UT WOS:000282646400075
ER
PT J
AU Ganapati, V
Schoenfelder, S
Castellanos, S
Oener, S
Koepge, R
Sampson, A
Marcus, MA
Lai, B
Morhenn, H
Hahn, G
Bagdahn, J
Buonassisi, T
AF Ganapati, Vidya
Schoenfelder, Stephan
Castellanos, Sergio
Oener, Sebastian
Koepge, Ringo
Sampson, Aaron
Marcus, Matthew A.
Lai, Barry
Morhenn, Humphrey
Hahn, Giso
Bagdahn, Joerg
Buonassisi, Tonio
TI Infrared birefringence imaging of residual stress and bulk defects in
multicrystalline silicon
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID SINGLE-CRYSTAL SILICON; LOCK-IN THERMOGRAPHY; X-RAY TOPOGRAPHY; SI
SOLAR-CELLS; PLASTIC-DEFORMATION; DIFFUSION LENGTH; GRAIN-BOUNDARIES;
RIBBON GROWTH; OPTICAL ANISOTROPY; THERMAL-EXPANSION
AB This manuscript concerns the application of infrared birefringence imaging (IBI) to quantify macroscopic and microscopic internal stresses in multicrystalline silicon (mc-Si) solar cell materials. We review progress to date, and advance four closely related topics. (1) We present a method to decouple macroscopic thermally-induced residual stresses and microscopic bulk defect related stresses. In contrast to previous reports, thermally-induced residual stresses in wafer-sized samples are generally found to be less than 5 MPa, while defect-related stresses can be several times larger. (2) We describe the unique IR birefringence signatures, including stress magnitudes and directions, of common microdefects in mc-Si solar cell materials including: beta-SiC and beta-Si(3)N(4) microdefects, twin bands, nontwin grain boundaries, and dislocation bands. In certain defects, local stresses up to 40 MPa can be present. (3) We relate observed stresses to other topics of interest in solar cell manufacturing, including transition metal precipitation, wafer mechanical strength, and minority carrier lifetime. (4) We discuss the potential of IBI as a quality-control technique in industrial solar cell manufacturing. c 2010 American Institute of Physics. [doi:10.1063/1.3468404]
C1 [Ganapati, Vidya; Schoenfelder, Stephan; Castellanos, Sergio; Sampson, Aaron; Buonassisi, Tonio] MIT, Cambridge, MA 02139 USA.
[Schoenfelder, Stephan; Koepge, Ringo; Bagdahn, Joerg] Fraunhofer Ctr Silicon Photovolta CSP, D-06120 Halle, Germany.
[Schoenfelder, Stephan; Koepge, Ringo] Fraunhofer Inst Mech Mat IWM, D-06120 Halle, Germany.
[Oener, Sebastian; Morhenn, Humphrey; Hahn, Giso] Univ Konstanz, D-78457 Constance, Germany.
[Marcus, Matthew A.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Lai, Barry] Argonne Natl Lab, Argonne, IL 60439 USA.
RP Ganapati, V (reprint author), MIT, Cambridge, MA 02139 USA.
EM buonassisi@mit.edu
RI Buonassisi, Tonio/J-2723-2012; Hahn, Giso/D-3111-2013;
OI Bagdahn, Joerg/0000-0002-1600-2444
FU U.S. Department of Energy [DE-FG36-09GO19001]; Endowed Fund for UROP and
MISTI-Germany; Federal Ministry of Education and Research (BMBF)
[03IP607]; German Federal Law on Support in Education; Director, Office
of Science, Office of Basic Energy Sciences, of the U.S. Department of
Energy [DE-AC02-05CH11231, DE-AC02-06CH11357]
FX We acknowledge A. S. Argon, A. E. Hosoi, G. H. McKinley, and G.
Barbastathis for insightful comments, J. Lesniak for GFP equipment
support, A. Zuschlag for EBSD support, S. Olibet for lifetime
measurement support, H.-J. Axman for providing String Ribbon samples,
and D. P. Fenning, S. Hudelson, B. Pope, A. Fecych, B. K. Newman, and M.
I. Bertoni for mu-XRF and laboratory support. Financial support for this
research was provided by the U.S. Department of Energy, under Contract
No. DE-FG36-09GO19001, and through the generous support of Doug Spreng
and the Chesonis Family Foundation. Individual researcher support was
provided by the Paul E. Gray (1954) Endowed Fund for UROP and
MISTI-Germany (V. Ganapati), the Federal Ministry of Education and
Research (BMBF) within the project "SiThinSolar" (Contract No. 03IP607)
(S. Schoenfelder, R. Koepge), the German Federal Law on Support in
Education, BAfoeG (S. Oener). The Advanced Light Source and the Advanced
Photon Source are supported by the Director, Office of Science, Office
of Basic Energy Sciences, of the U.S. Department of Energy under
Contract Nos. DE-AC02-05CH11231 and DE-AC02-06CH11357, respectively.
NR 124
TC 28
Z9 28
U1 3
U2 43
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 SEP 15
PY 2010
VL 108
IS 6
AR 063528
DI 10.1063/1.3468404
PG 13
WC Physics, Applied
SC Physics
GA 660MD
UT WOS:000282646400046
ER
PT J
AU Li, JV
Johnston, SW
Li, XN
Albin, DS
Gessert, TA
Levi, DH
AF Li, Jian V.
Johnston, Steve W.
Li, Xiaonan
Albin, David S.
Gessert, Timothy A.
Levi, Dean H.
TI Discussion of some "trap signatures" observed by admittance spectroscopy
in CdTe thin-film solar cells
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
DE cadmium compounds; carrier density; electrical conductivity; II-VI
semiconductors; semiconductor diodes; semiconductor thin films; solar
cells; thin film devices
ID LEVEL TRANSIENT SPECTROSCOPY; BACK-CONTACT FORMATION
AB Considerable ambiguity and controversy exist concerning the defect signatures (H1, H2, and H3) frequently observed in admittance spectroscopy of thin-film CdTe solar cells. We prove that the commonly labeled H1 defects, observed in all devices in this study, are actually due to the freeze-out of the majority carriers in the neutral CdTe absorber. This freeze-out is evident in the temperature dependencies of capacitance, carrier concentration, and depletion region width. Contrary to intuitive expectation, the activation energy of freeze-out is less than, not identical to, that of the conductivity. In some other cases, H2 or H3 are observed and attributed to the back-contact potential barrier, rather than to the carrier emission from the traps. We extract the back-contact barrier height from the activation energy of the saturation current determined from the temperature-dependent current-voltage curves using the back-to-back diode model. The back-contact barrier height agrees well with the H2 or H3 energy determined by admittance spectroscopy. We present a more comprehensive and realistic equivalent circuit that includes the admittances from both the back-contact and the neutral absorber. (C) 2010 American Institute of Physics. [doi:10.1063/1.3475373]
C1 [Li, Jian V.; Johnston, Steve W.; Li, Xiaonan; Albin, David S.; Gessert, Timothy A.; Levi, Dean H.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Li, JV (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA.
EM jian.li@nrel.gov
RI Li, Jian/B-1627-2016
FU U.S. Department of Energy [DE-AC36-08GO28308]
FX The authors are grateful for insightful discussions with Dr. Yanfa Yan
at the National Renewable Energy Laboratory, Dr. Jennifer Heath at
Linfield College, and Dr. Oleg Sulima at GE Global Research. This
research is supported by the U.S. Department of Energy under Contract
No. DE-AC36-08GO28308.
NR 24
TC 8
Z9 8
U1 6
U2 34
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 SEP 15
PY 2010
VL 108
IS 6
AR 064501
DI 10.1063/1.3475373
PG 5
WC Physics, Applied
SC Physics
GA 660MD
UT WOS:000282646400154
ER
PT J
AU Oo, WMH
McCluskey, MD
Huso, J
Morrison, JL
Bergman, L
Engelhard, MH
Saraf, LV
AF Oo, W. M. Hlaing
McCluskey, M. D.
Huso, J.
Morrison, J. L.
Bergman, L.
Engelhard, M. H.
Saraf, L. V.
TI Incorporation of Cu acceptors in ZnO nanocrystals
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID SEMICONDUCTOR NANOCRYSTALS; COPPER; NANOPARTICLES; SURFACE
AB Doping of semiconductor nanocrystals is an important problem in materials research. Using infrared and x-ray photoelectron spectroscopy, we have observed Cu acceptor dopants that were intentionally introduced into ZnO nanocrystals during growth. The incorporation of Cu(2+) dopants increased as the average diameter of the nanocrystals was increased from similar to 3 to 6 nm. Etching the nanocrystals with acetic acid revealed a core-shell structure, where a lightly doped core is surrounded by a heavily doped shell. These observations are consistent with the trapped dopant model, in which dopant atoms stick to the surface of the core and are overgrown by the nanocrystal material. (C) 2010 American Institute of Physics. [ doi:10.1063/1.3486060]
C1 [Oo, W. M. Hlaing; McCluskey, M. D.] Washington State Univ, Dept Phys & Astron, Pullman, WA 99164 USA.
[Huso, J.; Morrison, J. L.; Bergman, L.] Univ Idaho, Dept Phys, Moscow, ID 83844 USA.
[Engelhard, M. H.; Saraf, L. V.] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA.
RP Oo, WMH (reprint author), Washington State Univ, Dept Phys & Astron, Pullman, WA 99164 USA.
EM mattmcc@wsu.edu
RI Engelhard, Mark/F-1317-2010;
OI Engelhard, Mark/0000-0002-5543-0812
FU U.S. Department of Energy [DE-FG02-07ER46386, DE-FG02-04ER46142];
National Science Foundation [DMR-1004804]; Department of Energy's Office
of Biological and Environmental Research, Pacific Northwest National
Laboratory
FX This work was supported by the U.S. Department of Energy (Grant Nos.
DE-FG02-07ER46386 and DE-FG02-04ER46142) and National Science Foundation
(Grant No. DMR-1004804). A portion of the research was performed using
EMSL, a national scientific user facility sponsored by the Department of
Energy's Office of Biological and Environmental Research and located at
Pacific Northwest National Laboratory.
NR 24
TC 7
Z9 8
U1 0
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 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD SEP 15
PY 2010
VL 108
IS 6
AR 064301
DI 10.1063/1.3486060
PG 3
WC Physics, Applied
SC Physics
GA 660MD
UT WOS:000282646400124
ER
PT J
AU Ramos, KJ
Hooks, DE
Sewell, TD
Cawkwell, MJ
AF Ramos, K. J.
Hooks, D. E.
Sewell, Thomas D.
Cawkwell, M. J.
TI Anomalous hardening under shock compression in (021)-oriented
cyclotrimethylene trinitramine single crystals
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID PENTAERYTHRITOL TETRANITRATE; RDX; ORIENTATION; INITIATION; PRESSURE
AB We recently proposed that the change observed in the elastic-plastic response of (111)-oriented cyclotrimethylene trinitramine (RDX) crystals under shock compression is caused by an anomalous hardening that is mediated by the homogeneous nucleation of partial dislocation loops with Burgers vector 0.16[010] on (001) {Cawkwell et al., [J. Appl. Phys. 107, 063512 (2010)]}. The orientation dependencies of the (001)[010] slip system suggested that (021)-oriented RDX crystals should also display an anomalous hardening. Molecular dynamics simulations of (021) -oriented RDX crystals confirm that this slip system is activated at a shock pressure 1.34 0.84), remain relatively high (similar to 0.80-0.9) from May to October, and then decrease from November to the following March (0.8 -> 0.57), having an annual average of 0.76. These CFs are comparable to those derived from ground-based radar-lidar observations during the Surface Heat Budget of the Arctic Ocean experiment and from satellite observations over the western Arctic regions. The monthly means of estimated clear-sky and measured all-sky shortwave (SW)-down and longwave (LW)-down fluxes at the two facilities are almost identical with the annual mean differences less than 1.6 Wm(-2). Values of LW cloud radiative forcing (CRF) are minimum (6 Wm(-2)) in March, then increase monotonically to reach maximum (63 Wm(-2)) in August, then decrease continuously to the following March. The cycle of SW CRF mirrors its LW counterpart with the greatest negative impact occurring during the snow-free months of July and August. On annual average, the negative SW CRFs and positive LW CRFs nearly cancel, resulting in annual average NET CRF of about 3.5 Wm(-2) on the basis of the combined ARM and BRW analysis. Compared with other studies, we find that LW CRF does not change over the Arctic regions significantly, but NET CRFs change from negative to positive from Alaska to the Beaufort Sea, indicating that Barrow is at a critical latitude for neutral NET CRF. The sensitivity study has shown that LW CRFs increase with increasing cloud fraction, liquid water path, and radiating temperature with high positive correlations (0.8-0.9). Negative correlations are found for SW CRFs, but a strong positive correlation between SW CRF and surface albedo exists.
C1 [Dong, Xiquan; Xi, Baike; Crosby, Kathryn] Univ N Dakota, Dept Atmospher Sci, Grand Forks, ND 58202 USA.
[Long, Charles N.] Pacific NW Natl Lab, US Dept Energy, Richland, WA 99352 USA.
[Stone, Robert S.; Shupe, Matthew D.] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA.
[Stone, Robert S.; Shupe, Matthew D.] Natl Ocean & Atmospher Adm Earth Syst Res Lab, Boulder, CO USA.
RP Dong, XQ (reprint author), Univ N Dakota, Dept Atmospher Sci, 4149 Univ Ave,Stop 9006, Grand Forks, ND 58202 USA.
EM dong@aero.und.edu
RI Shupe, Matthew/F-8754-2011;
OI Shupe, Matthew/0000-0002-0973-9982; Dong, Xiquan/0000-0002-3359-6117
FU NASA at the University of North Dakota [NNX07AW05G]; NSF [ATM0649549];
NASA [NNL04AA11G, NNG06GB59G]; Climate Change Research Division of the
U.S. Department of Energy; NOAA-ESRL
FX We would like to thank Sally Benson and Gerald G. Mace of the University
of Utah for providing preprocessed ARM radar-lidar data. This research
was primarily supported by NASA NEWS project under grant NNX07AW05G at
the University of North Dakota. The University of North Dakota authors
were also supported by NSF under grant ATM0649549, the NASA CERES
project under grant NNL04AA11G, and the NASA MAP project under grant
NNG06GB59G. Long and Shupe acknowledge the support of the Climate Change
Research Division of the U.S. Department of Energy as part of the
Atmospheric Radiation Measurement (ARM) Program. R. Stone receives
support from NOAA-ESRL. We thank D. Longenecker and T. Mefford of
NOAA-ESRL for their processing and dissemination of the BRW data.
Recognition is also extended to those responsible for the operation and
maintenance of the instruments that produced the data used in this
study; their diligent and dedicated efforts are often underappreciated.
NR 51
TC 21
Z9 22
U1 4
U2 15
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-897X
EI 2169-8996
J9 J GEOPHYS RES-ATMOS
JI J. Geophys. Res.-Atmos.
PD SEP 15
PY 2010
VL 115
AR D17212
DI 10.1029/2009JD013489
PG 14
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 652MQ
UT WOS:000282011500007
ER
PT J
AU Nag, A
Monine, MI
Blinov, ML
Goldstein, B
AF Nag, Ambarish
Monine, Michael I.
Blinov, Michael L.
Goldstein, Byron
TI A Detailed Mathematical Model Predicts That Serial Engagement of IgE-Fc
epsilon RI Complexes Can Enhance Syk Activation in Mast Cells
SO JOURNAL OF IMMUNOLOGY
LA English
DT Article
ID BASOPHILIC LEUKEMIA-CELLS; FOLLICULAR DENDRITIC CELLS; PROTEIN-TYROSINE
KINASE; HIGH-AFFINITY RECEPTOR; SIGNAL-TRANSDUCTION; ANTIBODY-AFFINITY;
LOOP TYROSINES; TCR ENGAGEMENT; DIMERS; PHOSPHORYLATION
AB The term serial engagement was introduced to describe the ability of a single peptide, bound to a MHC molecule, to sequentially interact with TCRs within the contact region between a T cell and an APC. In addition to ligands on surfaces, soluble multivalent ligands can serially engage cell surface receptors with sites on the ligand, binding and dissociating from receptors many times before all ligand sites become free and the ligand leaves the surface. To evaluate the role of serial engagement in Syk activation, we use a detailed mathematical model of the initial signaling cascade that is triggered when Fc epsilon RI is aggregated on mast cells by multivalent Ags. Although serial engagement is not required for mast cell signaling, it can influence the recruitment of Syk to the receptor and subsequent Syk phosphorylation. Simulating the response of mast cells to ligands that serially engage receptors at different rates shows that increasing the rate of serial engagement by increasing the rate of dissociation of the ligand-receptor bond decreases Syk phosphorylation. Increasing serial engagement by increasing the rate at which receptors are cross-linked ( for example by increasing the forward rate constant for cross-linking or increasing the valence of the ligand) increases Syk phosphorylation. When serial engagement enhances Syk phosphorylation, it does so by partially reversing the effects of kinetic proofreading. Serial engagement rapidly returns receptors that have dissociated from aggregates to new aggregates before the receptors have fully returned to their basal state. The Journal of Immunology, 2010, 185: 3268-3276.
C1 [Nag, Ambarish; Monine, Michael I.; Goldstein, Byron] Los Alamos Natl Lab, Theoret Biol & Biophys Grp, Los Alamos, NM 87545 USA.
[Blinov, Michael L.] Univ Connecticut, Ctr Hlth, Ctr Cell Anal & Modeling, Farmington, CT 06032 USA.
RP Goldstein, B (reprint author), Los Alamos Natl Lab, Grp T6, MS K710, Los Alamos, NM 87545 USA.
EM bxg@lanl.gov
FU National Institutes of Health [R37-GM035556, R01 GM076570, U54
RR022232]; Department of Energy [W-7405-ENG-36]
FX This work was supported by National Institutes of Health Grant
R37-GM035556 and by the Department of Energy through Contract
W-7405-ENG-36. M. L. B. received partial support from National
Institutes of Health Grants R01 GM076570 and U54 RR022232.
NR 42
TC 10
Z9 11
U1 0
U2 2
PU AMER ASSOC IMMUNOLOGISTS
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA
SN 0022-1767
J9 J IMMUNOL
JI J. Immunol.
PD SEP 15
PY 2010
VL 185
IS 6
BP 3268
EP 3276
DI 10.4049/jimmunol.1000326
PG 9
WC Immunology
SC Immunology
GA 646RI
UT WOS:000281559300018
PM 20733205
ER
PT J
AU Annunziata, O
Miller, DG
Albright, JG
AF Annunziata, Onofrio
Miller, Donald G.
Albright, John G.
TI Quaternary diffusion coefficients for the sucrose-NaCl-KCl-water system
at 25 degrees C
SO JOURNAL OF MOLECULAR LIQUIDS
LA English
DT Article
DE Diffusion; electrolyte; carbohydrates; cross diffusion; coupled
diffusion
ID MUTUAL DIFFUSION; MULTICOMPONENT DIFFUSION; ISOTHERMAL DIFFUSION;
AQUEOUS-SOLUTIONS; CRYSTAL-GROWTH; DENSITIES; PRECISION; RELEVANT;
RAYLEIGH; BINARY
AB Transport properties of saccharide-salt aqueous mixtures are important for basic research and applications in the biochemical and biotechnological fields. We have experimentally determined the nine multicomponent diffusion coefficients for the sucrose (0.25 M) + NaCl (0.50 M) + KCl (0.50 M) + H(2)O quaternary system at 25 degrees C. Our results are compared with those previously obtained for all the corresponding ternary systems and binary systems. A simple excluded-volume model can be used to successfully predict the effect of sucrose on salt cross-term diffusion coefficients for ternary and quaternary systems. We have found that the ternary cross-term diffusion coefficients can be used to make reasonable estimates of the corresponding quaternary coefficients. These estimates can replace the corresponding experimental data when they cannot be measured with satisfactory precision. (C) 2010 Elsevier By. All rights reserved.
C1 [Annunziata, Onofrio; Albright, John G.] Texas Christian Univ, Ft Worth, TX 76129 USA.
[Miller, Donald G.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
RP Annunziata, O (reprint author), Texas Christian Univ, Ft Worth, TX 76129 USA.
EM o.annunziata@tcu.edu
FU NASA [NAG8-1356]; ACS [47244-G4]; TCU
FX This research was supported by the NASA BioTechnology Program
(NAG8-1356), the ACS Petroleum Research Funds (47244-G4) and TCU RCAF
funds.
NR 22
TC 3
Z9 3
U1 5
U2 12
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0167-7322
J9 J MOL LIQ
JI J. Mol. Liq.
PD SEP 15
PY 2010
VL 156
IS 1
SI SI
BP 33
EP 37
DI 10.1016/j.molliq.2010.05.016
PG 5
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 654TU
UT WOS:000282194100006
ER
PT J
AU Warshavsky, VB
Song, XY
AF Warshavsky, Vadim B.
Song, Xueyu
TI Perturbation theory for solid-liquid interfacial free energies
SO JOURNAL OF PHYSICS-CONDENSED MATTER
LA English
DT Article
ID CRYSTAL-MELT INTERFACES; FUNDAMENTAL MEASURE-THEORY; DENSITY-FUNCTIONAL
THEORY; EMBEDDED-ATOM METHOD; SURFACE-TENSION; CLASSICAL SOLIDS; FLUID;
METALS; VAPOR; POINT
AB A perturbation theory is developed to calculate solid-liquid interfacial free energies, including anisotropy. The method is applied to systems with inverse-power and Lennard-Jones pair potentials as well as to metal systems with embedded-atom model potentials. The results are in reasonable agreement with the corresponding ones obtained from molecular dynamics simulations.
C1 [Warshavsky, Vadim B.] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
RP Warshavsky, VB (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
EM xsong@iastate.edu
FU Division of Materials Sciences and Engineering, Office of Basic Energy
Sciences, US Department of Energy with Iowa State University
[W-7405-ENG-82]; NSF [CHE-0809431]
FX This research was sponsored by the Division of Materials Sciences and
Engineering, Office of Basic Energy Sciences, US Department of Energy,
under contract W-7405-ENG-82 with Iowa State University (VBW and XS) and
by an NSF grant CHE-0809431(XS).
NR 61
TC 5
Z9 5
U1 0
U2 13
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-8984
J9 J PHYS-CONDENS MAT
JI J. Phys.-Condes. Matter
PD SEP 15
PY 2010
VL 22
IS 36
AR 364112
DI 10.1088/0953-8984/22/36/364112
PG 7
WC Physics, Condensed Matter
SC Physics
GA 645AE
UT WOS:000281422500014
PM 21386528
ER
PT J
AU Zhang, ZC
Dong, JA
West, R
Amine, K
AF Zhang, Zhengcheng
Dong, Jian
West, Robert
Amine, Khalil
TI Oligo(ethylene glycol)-functionalized disiloxanes as electrolytes for
lithium-ion batteries
SO JOURNAL OF POWER SOURCES
LA English
DT Article; Proceedings Paper
CT 4th International Conference on Polymer Batteries and Fuel Cells
CY AUG 02-06, 2009
CL Jeju Isl, SOUTH KOREA
DE Lithium-ion batteries; Electrolytes; Functionalized disiloxanes; Thermal
stability; Cycling performance
ID SOLID POLYMER ELECTROLYTES; CARBENE COMPLEXES; CONDUCTIVITY; SALTS
AB Functionalized disiloxane compounds were synthesized by attaching oligo(ethylene glycol) chains, -(CH(2)CH(2)O)-(n), n = 2-7, via hydrosilation, dehydrocoupling, and nucleophilic substitution reactions and were examined as non-aqueous electrolyte solvents in lithium-ion cells. The compounds were fully characterized by (1) H, (13)C, and (29)Si nuclear magnetic resonance (NMR) spectroscopy. Upon doping with lithium bis(oxalato)borate (LiBOB) or LiPF(6), the disiloxane electrolytes showed conductivities up to 6.2 x 10(-4) S cm(-1) at room temperature. The thermal behavior of the electrolytes was studied by differential scanning calorimetry, which revealed very low glass transition temperatures before and after LiBOB doping and much higher thermal stability compared to organic carbonate electrolytes. Cyclic voltammetry measurements showed that disiloxane-based electrolytes with 0.8 M LiBOB salt concentration are stable to 4.7 V. The LiBOB/disiloxane combinations were found to be good electrolytes for lithium-ion cells; unlike LiPF6, LiBOB can provide a good passivation film on the graphite anode. The LiPF(6)/disiloxane electrolyte was enabled in lithium-ion cells by adding 1 wt% vinyl ethylene carbonate (VEC). Full cell performance tests with LiNi(0.80)Co(0.15)Al(0.05)O(2) as the cathode and mesocarbon microbead (MCMB) graphite as the anode show stable cyclability. The results demonstrate that disiloxane-based electrolytes have considerable potential as electrolytes for use in lithium-ion batteries. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Zhang, Zhengcheng; Dong, Jian; Amine, Khalil] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
[West, Robert] Univ Wisconsin, Dept Chem, Organosilicon Res Ctr, Madison, WI 53706 USA.
RP Zhang, ZC (reprint author), Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM zzhang@anl.gov; amine@anl.gov
RI Amine, Khalil/K-9344-2013
NR 30
TC 21
Z9 22
U1 1
U2 35
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0378-7753
J9 J POWER SOURCES
JI J. Power Sources
PD SEP 15
PY 2010
VL 195
IS 18
SI SI
BP 6062
EP 6068
DI 10.1016/j.jpowsour.2009.12.067
PG 7
WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials
Science, Multidisciplinary
SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science
GA 616IS
UT WOS:000279203100041
ER
PT J
AU Barnese, K
Sheng, YW
Stich, TA
Gralla, EB
Britt, RD
Cabelli, DE
Valentine, JS
AF Barnese, Kevin
Sheng, Yuewei
Stich, Troy A.
Gralla, Edith B.
Britt, R. David
Cabelli, Diane E.
Valentine, Joan Selverstone
TI Investigation of the Highly Active Manganese Superoxide Dismutase from
Saccharomyces cerevisiae
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID PRODUCT INHIBITION; HYDROGEN-PEROXIDE; MITOCHONDRIA; EXPRESSION; YEAST
AB Manganese superoxide dismutase (MnSOD) from different species differs in its efficiency in removing high concentrations of superoxide (O-2(-)), due to different levels of product inhibition. Human MnSOD exhibits a substantially higher level of product inhibition than the MnSODs from bacteria. In order to investigate the mechanism of product inhibition and whether it is a feature common to eukaryotic MnSODs, we purified MnSOD from Saccharomyces cerevisiae (ScMnSOD). It was a tetramer with 0.6 equiv of Mn per monomer. The catalytic activity of ScMnSOD was investigated by pulse radiolysis and compared with human and two bacterial (Escherichia coli and Deinococcus radiodurans) MnSODs. To our surprise, ScMnSOD most efficiently facilitates removal of high concentrations of O-2(-) among these MnSODs. The gating value k(2)/ k(3) that characterizes the level of product inhibition scales as ScMnSOD > D. radiodurans MnSOD > E coli MnSOD > human MnSOD. While most MnSODs rest as the oxidized form, ScMnSOD was isolated in the Mn2+ oxidation state as revealed by its optical and electron paramagnetic resonance spectra. This finding poses the possibility of elucidating the origin of product inhibition by comparing human MnSOD with ScMnSOD.
C1 [Cabelli, Diane E.] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
[Barnese, Kevin; Sheng, Yuewei; Gralla, Edith B.; Valentine, Joan Selverstone] Univ Calif Los Angeles, Dept Chem & Biochem, Los Angeles, CA 90095 USA.
[Barnese, Kevin; Valentine, Joan Selverstone] Ewha Womans Univ, Dept Bioinspired Chem, Seoul 120750, South Korea.
[Stich, Troy A.; Britt, R. David] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA.
RP Cabelli, DE (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
EM cabelli@bnl.gov; jsv@chem.ucla.edu
RI Stich, Troy/F-1625-2013
OI Stich, Troy/0000-0003-0710-1456
FU KOSEF/MEST [R31-2008-000-10010-0]; National Institutes of Health; U.S.
Department of Energy [DE-AC02-98CH10886]; Division of Chemical Sciences,
Geosciences, and Biosciences, Office of Basic Energy Sciences;
[DK46828]; [GM48242]
FX This work was supported by Grant DK46828, KOSEF/MEST through WCU project
(R31-2008-000-10010-0) to J.S.V. and National Institutes of Health and
Grant GM48242 to R.D.B. Radiolysis studies were carried out at the
Center for Radiation Chemistry Research at BNL, which is funded under
Contract DE-AC02-98CH10886 with the U.S. Department of Energy and
supported by its Division of Chemical Sciences, Geosciences, and
Biosciences, Office of Basic Energy Sciences.
NR 19
TC 14
Z9 14
U1 1
U2 12
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 SEP 15
PY 2010
VL 132
IS 36
BP 12525
EP 12527
DI 10.1021/ja104179r
PG 3
WC Chemistry, Multidisciplinary
SC Chemistry
GA 653FP
UT WOS:000282074200003
PM 20726524
ER
PT J
AU Berezniak, T
Zahran, M
Imhof, P
Jaschke, A
Smith, JC
AF Berezniak, Tomasz
Zahran, Mai
Imhof, Petra
Jaeschke, Andres
Smith, Jeremy C.
TI Magnesium-Dependent Active-Site Conformational Selection in the
Diels-Alderase Ribozyme
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID MOLECULAR-DYNAMICS SIMULATION; RNA WORLD; MACROPHOMATE SYNTHASE; BOND
FORMATION; CATALYSIS; BIOSYNTHESIS; INSIGHT; MG2+
AB The Diels-Alderase ribozyme, an in vitro-evolved ribonucleic acid enzyme, accelerates the formation of carbon-carbon bonds between an anthracene diene and a maleimide dienophile in a [4 + 2] cycloaddition, a reaction with broad application in organic chemistry. Here, the Diels-Alderase ribozyme is examined via molecular dynamics (MD) simulations in both crystalline and aqueous solution environments. The simulations indicate that the catalytic pocket is highly dynamic. At low Mg(2+) ion concentrations, inactive states with the catalytic pocket closed dominate. Stabilization of the enzymatically active, open state of the catalytic pocket requires a high concentration of Mg(2+) ions (e.g., 54 mM), with cations binding to specific phosphate sites on the backbone of the residues bridging the opposite strands of the pocket. The free energy profile for pocket opening at high Mg(2+) cation concentration exhibits a double minimum, with a barrier to opening of similar to 5.5 kJ/mol and the closed state similar to 3 kJ/mol lower than the open state. Selection of the open state on substrate binding leads to the catalytic activity of the ribozyme. The simulation results explain structurally the experimental observation that full catalytic activity depends on the Mg(2+) ion concentration.
C1 [Berezniak, Tomasz; Zahran, Mai; Imhof, Petra; Smith, Jeremy C.] Univ Heidelberg, IWR, D-69120 Heidelberg, Germany.
[Berezniak, Tomasz; Jaeschke, Andres] Univ Heidelberg, Inst Pharm & Mol Biotechnol, D-69120 Heidelberg, Germany.
[Smith, Jeremy C.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Imhof, P (reprint author), Univ Heidelberg, IWR, Neuenheinzer Feld 368, D-69120 Heidelberg, Germany.
EM petra.imhof@iwr.uni-heidelberg.de
RI Jaschke, Andres/F-1575-2010; smith, jeremy/B-7287-2012; Imhof,
Petra/G-5656-2013
OI Jaschke, Andres/0000-0002-4625-2655; smith, jeremy/0000-0002-2978-3227;
FU German Research Foundation (DFG); Landesstiftung Baden-Wurttemberg; U.S.
Department of Energy; National Science Foundation
FX T.B. thanks Emal M. Alekozai, Thomas Splettstoesser, and Lars Meinhold
for useful discussions. We gratefully acknowledge funding from the
German Research Foundation (DFG) through the award of a doctoral
scholarship in the International Research Training Group IGK 710
"Complex Processes: Modeling, Simulation and Optimization". P.I. is
grateful to the Landesstiftung Baden-Wurttemberg for funding in the
Postdoctoral Elite Program. J.C.S. was supported by a Laboratory
Directed Research and Development "Systems Biology" grant from the U.S.
Department of Energy. The simulations were run on the Heidelberg Linux
Cluster System at the Interdisciplinary Center for Scientific Computing
(IWR) of the University of Heidelberg. The work was also supported by a
National Science Foundation TeraGrid allocation provided by the National
Institute for Computational Sciences.
NR 37
TC 15
Z9 15
U1 2
U2 21
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 SEP 15
PY 2010
VL 132
IS 36
BP 12587
EP 12596
DI 10.1021/ja101370e
PG 10
WC Chemistry, Multidisciplinary
SC Chemistry
GA 653FP
UT WOS:000282074200020
PM 20722413
ER
PT J
AU Fulton, JL
Balasubramanian, M
AF Fulton, John L.
Balasubramanian, Mahalingam
TI Structure of Hydronium (H3O+)/Chloride (Cl-) Contact Ion Pairs in
Aqueous Hydrochloric Acid Solution: A Zundel-like Local Configuration
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID ABSORPTION FINE-STRUCTURE; MOLECULAR-DYNAMICS SIMULATIONS; SUPERCRITICAL
WATER; MICROSCOPIC STRUCTURE; COMPUTER-SIMULATIONS; DIFFRACTION PATTERN;
HCL SOLUTIONS; BROMIDE ION; HYDRATION; SPECTROSCOPY
AB A comprehensive analysis of the H3O+ and H2O structure in the first solvation shell about Cl- in aqueous HCl solutions is reported from X-ray absorption fine structure (XAFS) measurements. Results show increasing degree of contact ion pairing between Cl- and H3O+ as the HCl concentration increases from 6.0 m, 10.0 m, and finally 16.1 m HCl (acid concentrations are expressed as molality or mole HCl/ 1000 g water). At the highest acid concentration there are on average, approximately 1.6 H3O+ ions and 4.2 H2O's in the first shell about Cl-. The structure of the Cl-/H3O+ contact ion pair is distinctly different from that of the H2O structure about Cl-. The Cl-O bond length (2.98 angstrom) for Cl-/H3O+ is approximately 0.16 angstrom shorter than the Cl-/H2O bond. The bridging proton resides at an intermediate position between Cl and O at 1.60 angstrom from the Cl- and approximately 1.37 angstrom from the O of the H3O+. The bridging-proton structure of this contact ion pair, (Cl-H-OH2), is similar to the structure of the water Zundel ion, (H2O-H-OH2+). In both cases there is a shortened CI-O or O-O bond, and the intervening proton bond distances are substantially longer than for the covalent bonds of either HCI or H20. A detailed structural analysis of the aqueous chloride species, Cl-/(H2O)(n), was also completed as part of this study in order to understand the relative importance of various XAFS photoelectron scattering paths. For aqueous Cl- the measured Cl-O and Cl-H distances of 3.14 angstrom and 2.23 angstrom, respectively, are in excellent agreement with earlier neutron and X-ray diffraction results. Overall, these results significantly improve our understanding of the interaction of H3O+ with Cl-. The results are of interest to fundamental physical chemistry and they have important consequences in biochemical, geochemical, and atmospheric processes.
C1 [Fulton, John L.] Pacific NW Natl Lab, Chem & Mat Sci Div, Richland, WA 99354 USA.
[Balasubramanian, Mahalingam] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RP Fulton, JL (reprint author), Pacific NW Natl Lab, Chem & Mat Sci Div, Richland, WA 99354 USA.
EM john.fulton@pnl.gov
FU U.S. Department of Energy's (DOE) Office of Basic Energy Sciences,
Division of Chemical Sciences, Geosciences and Biosciences; NSERC;
University of Washington; Simon Fraser University; Pacific Northwest
National Laboratory; Advanced Photon Source; U.S. Department of Energy,
Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
FX This work was supported by the U.S. Department of Energy's (DOE) Office
of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and
Biosciences. PNNL is operated for the Department of Energy by Battelle.
PNC/XSD facilities at the Advanced Photon Source, and research at these
facilities, are supported by the U.S. Department of Energy - Basic
Energy Sciences, a major facilities access grant from NSERC, the
University of Washington, Simon Fraser University, the Pacific Northwest
National Laboratory, and the Advanced Photon Source. Use of the Advanced
Photon Source is also supported by the U.S. Department of Energy, Office
of Science, Office of Basic Energy Sciences, under Contract
DE-AC02-06CH11357.
NR 46
TC 27
Z9 27
U1 1
U2 27
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 SEP 15
PY 2010
VL 132
IS 36
BP 12597
EP 12604
DI 10.1021/ja1014458
PG 8
WC Chemistry, Multidisciplinary
SC Chemistry
GA 653FP
UT WOS:000282074200021
PM 20731390
ER
PT J
AU Fay, AW
Blank, MA
Lee, CC
Hu, YL
Hodgson, KO
Hedman, B
Ribbe, MW
AF Fay, Aaron W.
Blank, Michael A.
Lee, Chi Chung
Hu, Yilin
Hodgson, Keith O.
Hedman, Britt
Ribbe, Markus W.
TI Characterization of Isolated Nitrogenase FeVco
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID IRON-MOLYBDENUM COFACTOR; RAY-ABSORPTION-SPECTROSCOPY;
AZOTOBACTER-VINELANDII NITROGENASE; ACID-LABILE SULFIDE; MOFE-PROTEIN;
FEMO-COFACTOR; K-EDGE; VANADIUM NITROGENASE; PRE-EDGE; COMPLEXES
AB The cofactors of the Mo- and V-nitrogenases (i.e., FeMoco and FeVco) are homologous metal centers with distinct catalytic properties. So far, there has been only one report on the isolation of FeVco from Azotobacter chroococcum. However, this isolated FeVco species did not carry the full substrate-reducing capacity, as it is unable to restore the N(2)-reducing ability of the cofactor-deficient MoFe protein. Here, we report the isolation and characterization of a fully active species of FeVco from A. vinelandii. Our metal and activity analyses show that FeVco has been extracted intact, carrying with it the characteristic capacity to reduce C(2)H(2) to C(2)H(6) and, perhaps even more importantly, the ability to reduce N(2) to NH(3). Moreover, our EPR and XAS/EXAFS investigations indicate that FeVco is similar to, yet distinct from FeMoco in electronic properties and structural topology, which could account for the differences in the reactivity of the two cofactors. The outcome of this study not only permits the proposal of the first EXAFS-based structural model of the isolated FeVco but also lays a foundation for future catalytic and structural investigations of this unique metallocluster.
C1 [Fay, Aaron W.; Lee, Chi Chung; Hu, Yilin; Ribbe, Markus W.] Univ Calif Irvine, Dept Mol Biol & Biochem, Irvine, CA 92697 USA.
[Blank, Michael A.; Hodgson, Keith O.] Stanford Univ, Dept Chem, Stanford, CA 94305 USA.
[Hodgson, Keith O.; Hedman, Britt] Stanford Univ, SLAC, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA.
RP Hu, YL (reprint author), Univ Calif Irvine, Dept Mol Biol & Biochem, Irvine, CA 92697 USA.
EM yilinh@uci.edu; hodgson@ssrl.slac.stanford.edu;
hedman@ssrl.slac.stanford.edu; mribbe@uci.edu
FU Herman Frasch Foundation [617-HF07]; NIH [GM 67626, RR 01209];
Department of Energy, Office of Basic Energy Science; National
Institutes of Health, National Center for Research Resources; DOE Office
of Biological and Environmental Research
FX This work was supported by Herman Frasch Foundation Grant 617-HF07
(M.W.R.), NIH Grant GM 67626 (M.W.R.) and NIH Grant RR 01209 (K.O.H.).
SSRL operations are funded by the Department of Energy, Office of Basic
Energy Science, and the SSRL Structural Molecular Biology Program by the
National Institutes of Health, National Center for Research Resources,
Biomedical Technology Program, and the DOE Office of Biological and
Environmental Research.
NR 36
TC 42
Z9 42
U1 6
U2 32
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 SEP 15
PY 2010
VL 132
IS 36
BP 12612
EP 12618
DI 10.1021/ja1019657
PG 7
WC Chemistry, Multidisciplinary
SC Chemistry
GA 653FP
UT WOS:000282074200023
PM 20718463
ER
PT J
AU Sun, N
Dey, A
Xiao, ZG
Wedd, AG
Hodgson, KO
Hedman, B
Solomon, EI
AF Sun, Ning
Dey, Abhishek
Xiao, Zhiguang
Wedd, Anthony G.
Hodgson, Keith O.
Hedman, Britt
Solomon, Edward I.
TI Solvation Effects on S K-Edge XAS Spectra of Fe-S Proteins: Normal and
Inverse Effects on WT and Mutant Rubredoxin
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID X-RAY-ABSORPTION; ELECTRONIC POPULATION ANALYSIS; MOLECULAR WAVE
FUNCTIONS; IRON-SULFUR CLUSTERS; RESONANCE RAMAN-SPECTRA;
CLOSTRIDIUM-PASTEURIANUM; MODEL COMPLEXES; REDOX POTENTIALS; DFT
CALCULATIONS; 2FE FERREDOXIN
AB S K-edge X-ray absorption spectroscopy (XAS) was performed on wild type Cp rubredoxin and its Cys - Ser mutants in both solution and lyophilized forms. For wild type rubredoxin and for the mutants where an interior cysteine residue (C6 or C39) is substituted by serine, a normal solvent effect is observed, that is, the S covalency increases upon lyophilization. For the mutants where a solvent accessible surface cysteine residue is substituted by serine, the S covalency decreases upon lyophilization which is an inverse solvent effect. Density functional theory (DFT) calculations reproduce these experimental results and show that the normal solvent effect reflects the covalency decrease due to solvent H-bonding to the surface thiolates and that the inverse solvent effect results from the covalency compensation from the interior thiolates. With respect to the Cys Ser substitution, the S covalency decreases. Calculations indicate that the stronger bonding interaction of the alkoxide with the Fe relative to that of thiolate increases the energy of the Fe d orbitals and reduces their bonding interaction with the remaining cysteines. The solvent effects support a surface solvent tuning contribution to electron transfer, and the Cys Ser result provides an explanation for the change in properties of related iron-sulfur sites with this mutation.
C1 [Sun, Ning; Dey, Abhishek; Hodgson, Keith O.; Solomon, Edward I.] Stanford Univ, Dept Chem, Stanford, CA 94305 USA.
[Xiao, Zhiguang; Wedd, Anthony G.] Univ Melbourne, Sch Chem, Parkville, Vic 3010, Australia.
[Xiao, Zhiguang; Wedd, Anthony G.] Univ Melbourne, Mol Sci & Biotechnol Inst Bio21, Parkville, Vic 3010, Australia.
[Hodgson, Keith O.; Hedman, Britt; Solomon, Edward I.] Stanford Univ, SLAC, Menlo Pk, CA 94025 USA.
RP Hodgson, KO (reprint author), Stanford Univ, Dept Chem, Stanford, CA 94305 USA.
EM edward.solomon@stanford.edu
RI Dey, Abhishek/D-2825-2013;
OI Dey, Abhishek/0000-0002-9166-3349; Xiao, Zhiguang/0000-0001-6908-8897
FU NSF [CHE-0948211]; Australian Research Council [A29930204]; Department
of Energy, Office of Basic Energy Sciences; Department of Energy, Office
of Biological and Environmental Research; National Center for Research
Resources (NCRR), National Institutes of Health (NIH) [5 P41 RR001209]
FX This research was supported by NSF CHE-0948211 (E.I.S.) and Australian
Research Council A29930204 (A.G.W.). SSRL operations are supported by
the Department of Energy, Office of Basic Energy Sciences. The SSRL
Structural Molecular Biology Program is supported by the National
Institutes of Health, National Center for Research Resources, Biomedical
Technology Program, and by the Department of Energy, Office of
Biological and Environmental Research. This publication was made
possible by Grant Number 5 P41 RR001209 from the National Center for
Research Resources (NCRR), a component of the National Institutes of
Health (NIH).
NR 47
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Z9 11
U1 0
U2 15
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 SEP 15
PY 2010
VL 132
IS 36
BP 12639
EP 12647
DI 10.1021/ja102807x
PG 9
WC Chemistry, Multidisciplinary
SC Chemistry
GA 653FP
UT WOS:000282074200026
PM 20726554
ER
PT J
AU Quan, HT
Zurek, WH
AF Quan, H. T.
Zurek, W. H.
TI Testing quantum adiabaticity with quench echo
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID COSMOLOGICAL EXPERIMENTS; PHASE-TRANSITION; STRINGS
AB Adiabaticity of quantum evolution is important in many settings; one example is adiabatic quantum computation (AQC). Nevertheless, to date, there is no effective method available for testing the adiabaticity of the evolution for the case where the eigenenergies of the driven Hamiltonian are not known. We propose a simple method for checking the adiabaticity of a quantum process for an arbitrary quantum system. We further propose an operational method for finding more efficient protocols that approximate adiabaticity, and suggest a 'uniformly adiabatic' quench scheme based on the Kibble-Zurek mechanism for the case where the initial and final Hamiltonians are given. This method should help in implementing AQC and other tasks where preserving the system in the ground state of a time-dependent Hamiltonian is desired.
C1 [Quan, H. T.; Zurek, W. H.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
RP Zurek, WH (reprint author), Los Alamos Natl Lab, Div Theoret, MS B213, Los Alamos, NM 87545 USA.
EM whzurek@gmail.com
RI Quan, Haitao/G-8521-2012
OI Quan, Haitao/0000-0002-4130-2924
FU US Department of Energy
FX This work was the supported by the US Department of Energy through the
LANL/LDRD Program. We thank Bogdan Damski, Anarb Das and Rishi Sharma
for helpful discussions.
NR 37
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U1 1
U2 6
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 SEP 15
PY 2010
VL 12
AR 093025
DI 10.1088/1367-2630/12/9/093025
PG 16
WC Physics, Multidisciplinary
SC Physics
GA 651CI
UT WOS:000281901800007
ER
PT J
AU Nau, D
Seidel, A
Orzekowsky, RB
Lee, SH
Deb, S
Giessen, H
AF Nau, D.
Seidel, A.
Orzekowsky, R. B.
Lee, S. -H.
Deb, S.
Giessen, H.
TI Hydrogen sensor based on metallic photonic crystal slabs
SO OPTICS LETTERS
LA English
DT Article
ID ELECTROMAGNETICALLY INDUCED TRANSPARENCY; THIN-FILMS; SENSITIVITY;
MECHANISM; ANALOG
AB We present a hydrogen sensor based on metallic photonic crystal slabs. Tungsten trioxide (WO(3)) is used as a waveguide layer below an array of gold nanowires. Hydrogen exposure influences the optical properties of this photonic crystal arrangement by gasochromic mechanisms, where the photonic crystal geometry leads to sharp spectral resonances. Measurements reveal a change of the transmission depending on the hydrogen concentration. Theoretical limits for the detection range and sensitivity of this approach are discussed. (C) 2010 Optical Society of America
C1 [Nau, D.; Seidel, A.; Orzekowsky, R. B.; Giessen, H.] Univ Stuttgart, Inst Phys 4, D-70550 Stuttgart, Germany.
[Nau, D.] Univ Bonn, Inst Angew Phys, D-53115 Bonn, Germany.
[Nau, D.; Seidel, A.; Orzekowsky, R. B.; Giessen, H.] Univ Stuttgart, Res Ctr SCoPE, D-70550 Stuttgart, Germany.
[Seidel, A.; Orzekowsky, R. B.] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
[Lee, S. -H.; Deb, S.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
RP Giessen, H (reprint author), Univ Stuttgart, Inst Phys 4, D-70550 Stuttgart, Germany.
EM giessen@physik.uni-stuttgart.de
RI Lee, Sehee/A-5989-2011
FU Deutsches Bundesministerium fur Bildung und Forschung (FKZ) [13N8340/1,
13N9049]
FX We thank the teams of R. Langen and K. D. Krause for technical support.
Financial support by the Deutsches Bundesministerium fur Bildung und
Forschung (FKZ 13N8340/1 and 13N9049) is gratefully acknowledged.
NR 15
TC 24
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U1 8
U2 22
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 SEP 15
PY 2010
VL 35
IS 18
BP 3150
EP 3152
PG 3
WC Optics
SC Optics
GA 652HN
UT WOS:000281994500051
PM 20847808
ER
PT J
AU Luo, QL
Martins, G
Yao, DX
Daghofer, M
Yu, R
Moreo, A
Dagotto, E
AF Luo, Qinlong
Martins, George
Yao, Dao-Xin
Daghofer, Maria
Yu, Rong
Moreo, Adriana
Dagotto, Elbio
TI Neutron and ARPES constraints on the couplings of the multiorbital
Hubbard model for the iron pnictides
SO PHYSICAL REVIEW B
LA English
DT Article
ID LAYERED SUPERCONDUCTOR; PHASE; COMPOUND; GAPS
AB The results of neutron-scattering and angle-resolved photoemission experiments for the Fe-pnictide parent compounds, and their metallic nature, are shown to impose severe constraints on the range of values that can be considered "realistic" for the intraorbital Hubbard repulsion U and Hund coupling J in multiorbital Hubbard models treated in the mean-field approximation. Phase diagrams for three-and five-orbital models are here provided, and the physically realistic regime of couplings is highlighted, to guide future theoretical work into the proper region of parameters of Hubbard models. In addition, using the random phase approximation, the pairing tendencies in these realistic coupling regions are investigated. It is shown that the dominant spin-singlet pairing channels in these coupling regimes correspond to nodal superconductivity, with strong competition between several states that belong to different irreducible representations. This is compatible with experimental bulk measurements that have reported the existence of nodes in several Fe-pnictide compounds.
C1 [Luo, Qinlong; Yao, Dao-Xin; Moreo, Adriana; Dagotto, Elbio] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
[Luo, Qinlong; Yao, Dao-Xin; Moreo, Adriana; Dagotto, Elbio] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Martins, George] Oakland Univ, Dept Phys, Rochester, MI 48309 USA.
[Yao, Dao-Xin] Sun Yat Sen Univ, Sch Phys & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China.
[Daghofer, Maria] IFW Dresden, D-01171 Dresden, Germany.
[Yu, Rong] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA.
RP Luo, QL (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
RI Daghofer, Maria/C-5762-2008; YU, RONG/C-1506-2012; Yu, Rong/K-5854-2012;
Yu, Rong/H-3355-2016; Martins, George/C-9756-2012
OI Daghofer, Maria/0000-0001-9434-8937; Martins, George/0000-0001-7846-708X
FU U.S. Department of Energy, Office of Basic Energy Sciences, Materials
Sciences and Engineering Division; Deutsche Forschungsgemeinschaft; Sun
Yat-Sen University; W.M. Keck Foundation
FX This research was sponsored by the U.S. Department of Energy, Office of
Basic Energy Sciences, Materials Sciences and Engineering Division (A.M.
and E.D.), the Deutsche Forschungsgemeinschaft under the Emmy-Noether
program (M.D.), the Sun Yat-Sen University under the Hundred Talents
program (D.X.Y.), and by the W.M. Keck Foundation (R.Y.). G. B. M.
especially acknowledges the help of S. Graser in developing the RPA
code, as well as discussions with A. Liebsch. E. D. acknowledges useful
discussions with D. Scalapino.
NR 70
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U1 1
U2 12
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 SEP 15
PY 2010
VL 82
IS 10
AR 104508
DI 10.1103/PhysRevB.82.104508
PG 16
WC Physics, Condensed Matter
SC Physics
GA 650JP
UT WOS:000281845400004
ER
PT J
AU Wang, X
Hartley, DJ
Riley, MA
Riedinger, LL
Aguilar, A
Carpenter, MP
Chiara, CJ
Chowdhury, P
Darby, I
Garg, U
Ijaz, Q
Janssens, RVF
Kondev, FG
Lakshmi, S
Lauritsen, T
Ma, WC
McCutchan, EA
Mukhopadhyay, S
Seyfried, EP
Stefanescu, I
Tandel, SK
Tandel, US
Teal, C
Vanhoy, JR
Zhu, S
AF Wang, X.
Hartley, D. J.
Riley, M. A.
Riedinger, L. L.
Aguilar, A.
Carpenter, M. P.
Chiara, C. J.
Chowdhury, P.
Darby, I.
Garg, U.
Ijaz, Q.
Janssens, R. V. F.
Kondev, F. G.
Lakshmi, S.
Lauritsen, T.
Ma, W. C.
McCutchan, E. A.
Mukhopadhyay, S.
Seyfried, E. P.
Stefanescu, I.
Tandel, S. K.
Tandel, U. S.
Teal, C.
Vanhoy, J. R.
Zhu, S.
TI Multi-quasiparticle structures up to spin similar to 44h in the odd-odd
nucleus Ta-168
SO PHYSICAL REVIEW C
LA English
DT Article
ID RARE-EARTH NUCLEI; WOBBLING MODE; BAND; HF-167; SPECTROSCOPY;
EXCITATIONS; REGION
AB High-spin states in the odd-odd nucleus Ta-168 have been populated in the Sn-120(V-51, 3n) reaction. Two multi-quasiparticle structures have been extended significantly from spin similar to 20h to above 40h. As a result, the first rotational alignment has been fully delineated and a second band crossing has been observed for the first time in this nucleus. Configurations for these strongly coupled rotational bands are proposed based on signature splitting, B(M1)/ B(E2) ratio information, and observed rotation-alignment behavior. Properties of the observed bands in 168Ta are compared to related structures in the neighboring odd-Z, odd-N, and odd-odd nuclei and are discussed within the framework of the cranked shell model.
C1 [Wang, X.; Riley, M. A.; Aguilar, A.; Teal, C.] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA.
[Hartley, D. J.; Seyfried, E. P.; Vanhoy, J. R.] USN Acad, Dept Phys, Annapolis, MD 21402 USA.
[Riedinger, L. L.; Darby, I.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
[Carpenter, M. P.; Janssens, R. V. F.; Lauritsen, T.; McCutchan, E. A.; Stefanescu, I.; Zhu, S.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
[Chiara, C. J.; Kondev, F. G.] Argonne Natl Lab, Nucl Engn Div, Argonne, IL 60439 USA.
[Chowdhury, P.; Lakshmi, S.; Tandel, S. K.; Tandel, U. S.] Univ Massachusetts, Dept Phys, Lowell, MA 01854 USA.
[Garg, U.] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA.
[Ijaz, Q.; Ma, W. C.; Mukhopadhyay, S.] Mississippi State Univ, Dept Phys, Mississippi State, MS 39762 USA.
[Stefanescu, I.] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA.
RP Wang, X (reprint author), Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA.
RI Soundara Pandian, Lakshmi/C-8107-2013; Carpenter, Michael/E-4287-2015
OI Soundara Pandian, Lakshmi/0000-0003-3099-1039; Carpenter,
Michael/0000-0002-3237-5734
FU US National Science Foundation [PHY-0554762, PHY-0456463, PHY-0754674];
US Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357,
DE-FG02-94ER40848, DE-FG02-96ER40983]; State of Florida
FX The authors gratefully acknowledge J. P. Greene for the preparation of
the targets and the ATLAS operations staff for providing the
high-quality beam. We also thank D. C. Radford and H. Q. Jin for their
software support. This work has been supported in part by the US
National Science Foundation under Grants No. PHY-0554762 (USNA), No.
PHY-0456463 (FSU), and No. PHY-0754674 (UND); the US Department of
Energy, Office of Nuclear Physics, under Contracts No. DE-AC02-06CH11357
(ANL), No. DE-FG02-94ER40848 (UML), and No. DE-FG02-96ER40983 (UTK); and
the State of Florida.
NR 34
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U1 0
U2 3
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 SEP 15
PY 2010
VL 82
IS 3
AR 034315
DI 10.1103/PhysRevC.82.034315
PG 9
WC Physics, Nuclear
SC Physics
GA 650JI
UT WOS:000281844700001
ER
PT J
AU Almeida, LG
Sturm, C
AF Almeida, Leandro G.
Sturm, Christian
TI Two-loop matching factors for light quark masses and three-loop mass
anomalous dimensions in the regularization invariant symmetric
momentum-subtraction schemes
SO PHYSICAL REVIEW D
LA English
DT Article
ID ABELIAN GAUGE THEORIES; QCD BETA-FUNCTION; HARMONIC POLYLOGARITHMS;
FEYNMAN-INTEGRALS; PERTURBATIVE QCD; BINOMIAL SUMS; RENORMALIZATION;
DIAGRAMS; ORDER; (MS)OVER-BAR
AB Light quark masses can be determined through lattice simulations in regularization invariant momentum-subtraction (RI/MOM) schemes. Subsequently, matching factors, computed in continuum perturbation theory, are used in order to convert these quark masses from a RI/MOM scheme to the (MS) over bar scheme. We calculate the two-loop corrections in QCD to these matching factors as well as the three-loop mass anomalous dimensions for the RI/SMOM and RI/SMOM(gamma mu) schemes. These two schemes are characterized by a symmetric subtraction point. Providing the conversion factors in the two different schemes allows for a better understanding of the systematic uncertainties. The two-loop expansion coefficients of the matching factors for both schemes turn out to be small compared to the traditional RI/MOM schemes. For n(f) = 3 quark flavors they are about 0.6%-0.7% and 2%, respectively, of the leading order result at scales of about 2 GeV. Therefore, they will allow for a significant reduction of the systematic uncertainty of light quark mass determinations obtained through this approach. The determination of these matching factors requires the computation of amputated Green's functions with the insertions of quark bilinear operators. As a by-product of our calculation we also provide the corresponding results for the tensor operator.
C1 [Almeida, Leandro G.] SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA.
[Almeida, Leandro G.; Sturm, Christian] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
RP Almeida, LG (reprint author), SUNY Stony Brook, CN Yang Inst Theoret Phys, Stony Brook, NY 11794 USA.
RI Sturm, Christian/Q-2713-2015
OI Sturm, Christian/0000-0002-3137-4940
FU U.S. DOE [DE-AC02-98CH10886]
FX We are grateful to our colleagues of the RBC-UKQCD Collaborations for
many valuable discussions, in particular, to A. Soni for advice and
encouragement. We would like to thank T. Izubuchi and S. Uccirati for
conversations about the master integrals as well as Y. Aoki for
important discussions. This work was supported by the U.S. DOE under
Contract No. DE-AC02-98CH10886.
NR 58
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U1 0
U2 3
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 SEP 15
PY 2010
VL 82
IS 5
AR 054017
DI 10.1103/PhysRevD.82.054017
PG 16
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 650IX
UT WOS:000281843600002
ER
PT J
AU Paller, MH
Knox, AS
AF Paller, Michael H.
Knox, Anna S.
TI Amendments for the in situ remediation of contaminated sediments:
Evaluation of potential environmental impacts
SO SCIENCE OF THE TOTAL ENVIRONMENT
LA English
DT Article
DE Active caps; Contaminated sediments; Toxicity; Benthos; Apatite;
Organoclay
ID BIOAVAILABILITY; METALS
AB Active sediment caps represent a comparatively new technology for remediating contaminated sediments. They are made by applying chemically active amendments that reduce contaminant mobility and bioavailability to the sediment surface. The objective of this study was to determine if active cap amendments including organoclay, apatite, and biopolymers have the potential to harm benthic organisms. Methods included laboratory bioassays of amendment toxicity and field evaluations of amendment impacts on organisms held in cages placed within pilot-scale active caps located in Steel Creek, a South Carolina (USA) stream. Test organisms included Hyalella azteca, Leptocheirus plumulosus, Lumbriculus variegatus, and Corbicula fluminea to represent a range of feeding modes, burrowing behaviors, and both fresh and saltwater organisms. In addition to the laboratory and field assays, chemical extractions were performed to determine if the amendments contained harmful impurities that could leach into the ambient environment. Laboratory bioassays indicated that 100% apatite had minimal effects on Hyalella in freshwater and up to 25% organoclay was nontoxic to Leptocheirus in brackish water. Field evaluations indicated that pilot-scale caps composed of up to 50% apatite and 25% organoclay did not harm Hyalella. Lumbriculus, or Corbicula. In contrast, organisms in caps containing biopolymers died because of physical entrapment and/or suffocation by the viscous biopolymers. The extractions showed that the amendments did not release harmful concentrations of metals. These studies indicated that apatite and organoclay are nontoxic at concentrations (up to 50% and 25% by weight, respectively) needed for the construction of active caps that are useful for the remediation of metals and organic contaminants in sediments. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Paller, Michael H.; Knox, Anna S.] Savannah River Natl Lab, Aiken, SC 29808 USA.
RP Paller, MH (reprint author), Savannah River Natl Lab, Bldg 773-42A, Aiken, SC 29808 USA.
EM michael.paller@srnl.doe.gov
FU DoD [ER 1501]; Savannah River National Laboratory
FX We thank Matthew Brim, William Macky, and Perry Allen for assistance in
the laboratory and field. This work was sponsored by the DoD Strategic
Environmental Research and Development Program (SERDP) under project ER
1501 and the Savannah River National Laboratory.
NR 25
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U1 0
U2 29
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0048-9697
J9 SCI TOTAL ENVIRON
JI Sci. Total Environ.
PD SEP 15
PY 2010
VL 408
IS 20
BP 4894
EP 4900
DI 10.1016/j.scitotenv.2010.06.055
PG 7
WC Environmental Sciences
SC Environmental Sciences & Ecology
GA 651MJ
UT WOS:000281931500072
PM 20655093
ER
PT J
AU Windisch, CF
Thallapally, PK
McGrail, BP
AF Windisch, Charles F., Jr.
Thallapally, Praveen K.
McGrail, B. P.
TI Competitive adsorption study of CO2 and SO2 on
Co-3(II)[Co-III(CN)(6)](2) using DRIFTS
SO SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
LA English
DT Article
DE Carbon dioxide; Sulfur dioxide; Competitive adsorption; DRIFTS;
Infrared; Reflectance
ID PRUSSIAN BLUE ANALOGS; CATALYSTS; HYDROGEN; NITROSYL; DIOXIDE; ALUMINA;
CARBON; ZN
AB Diffuse reflectance infrared Fourier transform spectroscopy was used to study the competitive adsorption of CO2 and SO2 on the cobalt Prussian blue analogue Co-3(II)[Co-III(CN)(6)](2) at 298 K. Characteristic peaks for adsorbed CO2 and SO2 species were identified and their relative areas, measured simultaneously as a function of pressure at 298 K, varied in accordance with a Langmuir-Freundlich isotherm fitted to both gases in the low-coverage Henry's Law limit. Evidence for co-adsorption of trace water was also obtained, as well as the apparent formation of an analogous cobalt nitroprusside compound as a reaction product under certain conditions. The several aspects of the adsorption of CO2 and SO2 determined in this work point to an important role for real-time diffuse reflectance infrared measurements in adsorption studies, particularly in the case of competitive adsorption where the occurrence and fate of molecular-level markers arising from more than one adsorbed species can be monitored simultaneously. Depending on the application, this may more than offset certain quantitative limitations of the technique that confine measurements to a relatively narrow set of experimental conditions and demand careful consideration of the effects of sample preparation and treatment. (c) 2010 Elsevier B.V. All rights reserved.
C1 [Windisch, Charles F., Jr.; Thallapally, Praveen K.; McGrail, B. P.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Windisch, CF (reprint author), Pacific NW Natl Lab, POB 999, Richland, WA 99352 USA.
EM cf.windisch@pnl.gov
RI thallapally, praveen/I-5026-2014
OI thallapally, praveen/0000-0001-7814-4467
FU U.S. Department of Energy, Office of Fossil Energy; U.S. Department of
Energy [DE-AC05-76RL01830]
FX This work was supported by the U.S. Department of Energy, Office of
Fossil Energy. The Pacific Northwest National Laboratory is operated by
Battelle for the U.S. Department of Energy under Contract
DE-AC05-76RL01830.
NR 18
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U1 3
U2 15
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1386-1425
J9 SPECTROCHIM ACTA A
JI Spectroc. Acta Pt. A-Molec. Biomolec. Spectr.
PD SEP 15
PY 2010
VL 77
IS 1
BP 287
EP 291
DI 10.1016/j.saa.2010.05.024
PG 5
WC Spectroscopy
SC Spectroscopy
GA 654WO
UT WOS:000282202000046
PM 20541964
ER
PT J
AU Ganusov, VV
Lukacher, AE
Byers, AM
AF Ganusov, Vitaly V.
Lukacher, Aron E.
Byers, Anthony M.
TI Persistence of viral infection despite similar killing efficacy of
antiviral CD8(+) T cells during acute and chronic phases of infection
SO VIROLOGY
LA English
DT Article
ID LYMPHOCYTIC CHORIOMENINGITIS VIRUS; DYNAMICS IN-VIVO; EFFECTOR FUNCTION;
CUTTING EDGE; MEMORY; ANTIGEN; RESPONSES; NAIVE; DIFFERENTIATION; RATES
AB Why some viruses establish chronic infections while others do not is poorly understood One possibility is that the host's immune response is impaired during chronic infections and is unable to clear the virus from the host In this report, we use a recently proposed framework to estimate the per capita killing efficacy of CD8(+) T cells, specific for the polyoma virus (PyV), which establishes a chronic infection in mice Surprisingly, the estimated per cell killing efficacy of PyV-specific effector CD8(+) T cells during the acute phase of the infection was very similar to the efficacy of effector CD8(+) T cells specific to lymphocytic choriomeningitis virus (LCMV-Armstrong). which is cleared from the host Our results suggest that persistence of PyV does not result from the generation of an inefficient PyV-specific CD8(+) T cell response, and that other host or viral factors are responsible for the ability of PyV to establish chronic infection (C) 2010 Elsevier Inc All rights reserved
C1 [Ganusov, Vitaly V.] Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA.
[Lukacher, Aron E.] Emory Univ, Sch Med, Dept Pathol, Atlanta, GA 30322 USA.
[Byers, Anthony M.] VaxDesign, Orlando, FL 32826 USA.
[Ganusov, Vitaly V.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Ganusov, VV (reprint author), Univ Tennessee, Dept Microbiol, Knoxville, TN 37996 USA.
OI Ganusov, Vitaly/0000-0001-6572-1691
FU US Department of Energy; University of Tennessee; NIH [R01CA71971]
FX We would like to thank Ruy Ribeiro, Alan Perelson and Amber Smith for
comments and suggestions during this work This work was supported by the
Marie Curie Incoming International Fellowship (FP6, VVG), US Department
of Energy through the LANL/LDRD Program (VVG), start-up funds from the
University of Tennessee (VVG), and NIH (R01CA71971, AEI.)
NR 53
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U1 0
U2 0
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0042-6822
J9 VIROLOGY
JI Virology
PD SEP 15
PY 2010
VL 405
IS 1
BP 193
EP 200
DI 10.1016/j.virol.2010.05.029
PG 8
WC Virology
SC Virology
GA 635XR
UT WOS:000280691700022
PM 20580390
ER
PT J
AU Levin, I
Woicik, JC
Llobet, A
Tucker, MG
Krayzman, V
Pokorny, J
Reaney, IM
AF Levin, I.
Woicik, J. C.
Llobet, A.
Tucker, M. G.
Krayzman, V.
Pokorny, J.
Reaney, I. M.
TI Displacive Ordering Transitions in Perovskite-Like AgNb1/2Ta1/2O3
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID PHASE-TRANSITIONS; X-RAY; DIELECTRIC-PROPERTIES; SOLID-SOLUTIONS;
CENTRAL PEAK; SCATTERING; MICROWAVE; SPECTRA; OXIDES; SYSTEM
AB Displacive phase transitions in perovskite-like solid solutions AgNb1/2Ta1/2O3 were studied using several diffraction and spectroscopic techniques sensitive to average and local structures. The room-temperature phase of AgNb1/2Ta1/2O3 (M-2) is analogous to that of the end-member AgNbO3 and exhibits Pbcm orthorhombic symmetry with lattice parameters root 2a(c) x root 2a(c) x 4a(c) (a(c) approximate to 4 angstrom refers to an ideal cubic perovskite cell). This structure combines complex octahedral tilting and average antipolar B-cation (Nb, Ta) displacements. Similar to AgNbO3, at higher temperatures, B-cations are disordered among multiple sites displaced along (111), directions. Partial ordering of local B-cation displacements is manifested in the so-called M-3 <-> M-2 transition, which preserves the average Pbcm symmetry determined by the tilted octahedral framework; the transition is accompanied by a broad exploitable maximum of dielectric constant. Ta substitution suppresses this ordering because of the dissimilar off-centering trends for Ta and Nb. According to the extended X-ray absorption fine structure (EXAFS) measurements, Nb cations exhibit much larger local off-center displacements than Ta, consistent with larger dielectric constants typically displayed by niobates compared to tantalates. AgNb1/2Ta1/2O3 maintains residual 8-site disorder down to low temperatures as opposed to 2-site disorder in AgNbO3. Our results suggest that Ag cations also exhibit displacive disorder and, on cooling, undergo ordering coupled to that of the B-cations.
C1 [Levin, I.; Woicik, J. C.] NIST, Div Ceram, Gaithersburg, MD 20899 USA.
[Llobet, A.] Los Alamos Natl Lab, Lujan Neutron Ctr, Los Alamos, NM 87545 USA.
[Tucker, M. G.] Rutherford Appleton Lab, ISIS, Didcot OX11 0QX, Oxon, England.
[Pokorny, J.; Reaney, I. M.] Univ Sheffield, Dept Mat Engn, Sheffield, S Yorkshire, England.
[Pokorny, J.] Acad Sci Czech Republic, Inst Phys, Prague, Czech Republic.
RP Levin, I (reprint author), NIST, Div Ceram, Gaithersburg, MD 20899 USA.
EM igor.levin@nist.gov
RI Llobet, Anna/B-1672-2010; Levin, Igor/F-8588-2010; Pokorny,
Jan/F-4569-2011; Tucker, Matt/C-9867-2016
OI Pokorny, Jan/0000-0002-2614-1667; Tucker, Matt/0000-0002-2891-7086
FU Department of Energy Office of Basic Energy Sciences; Los Alamos
National Laboratory [W-7405-ENG-36]
FX Neutron diffraction measurements were conducted at (1) the Lujan Center
at Los Alamos Neutron Science Center funded by the Department of Energy
Office of Basic Energy Sciences and Los Alamos National Laboratory under
contract No. W-7405-ENG-36 and (2) the ISIS Pulsed Neutron and Muon
Source supported by a beam-time allocation from the Science and
Technology Facilities Council.
NR 21
TC 12
Z9 12
U1 2
U2 23
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 SEP 14
PY 2010
VL 22
IS 17
BP 4987
EP 4995
DI 10.1021/cm101263p
PG 9
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 645MA
UT WOS:000281461100019
ER
PT J
AU Todorov, I
Chung, DY
Claus, H
Gray, KE
Li, QA
Schleuter, J
Bakas, T
Douvalis, AP
Gutmann, M
Kanatzidis, MG
AF Todorov, Iliya
Chung, Duck Young
Claus, Helmut
Gray, Kenneth E.
Li, Qing'an
Schleuter, John
Bakas, Thomas
Douvalis, Alexios P.
Gutmann, Matthias
Kanatzidis, Mercouri G.
TI Selective Substitution of Cr in CaFe4As3 and Its Effect on the Spin
Density Wave
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID T-C; SUPERCONDUCTIVITY; LIFEAS; LAO1-XFXFEAS; PRESSURE
AB Single crystals of CaCr0.84Fe3.16As3, a Cr substituted analog of CaFe4As3, were grown from Sn flux and characterized with single crystal neutron diffraction. CaCr0.84Fe3.16As3 crystallizes in the orthorhombic space group Pnma with a three-dimensional framework, where Fe, Cr, and As form a covalent channel-like network with Ca2+ cations residing in the channels. CaCr0.84Fe3.16As3 has a unit cell of a = 12.057(4) angstrom, b = 3.7374(13) angstrom, and c = 11.694(3) A, as determined by room temperature single crystal neutron diffraction (R-1 = 0.0747, wR(2) = 0.1825). Structural data was also collected at 10 K. The single crystal neutron data showed that Cr selectively occupies a particular metal site, Fe(4). The antiferromagnetic transition associated with spin density wave (SDW) in the parent compound is preserved and shifts from 96 to 103 K with the selective Cr doping. Mossbauer, magnetic, and electrical resistivity measurements are reported.
C1 [Todorov, Iliya; Chung, Duck Young; Claus, Helmut; Gray, Kenneth E.; Li, Qing'an; Schleuter, John; Kanatzidis, Mercouri G.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Kanatzidis, Mercouri G.] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA.
[Bakas, Thomas; Douvalis, Alexios P.] Univ Ioannina, Dept Phys, GR-45110 Ioannina, Greece.
[Gutmann, Matthias] Rutherford Appleton Lab, ISIS Facil, Oxford, England.
RP Kanatzidis, MG (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA.
RI Li, Qingan/L-3778-2013
FU U.S. Department of Energy, Office of Science, Basic Energy Sciences
[DE-AC02-06CH11357]
FX This research was supported by the U.S. Department of Energy, Office of
Science, Basic Energy Sciences under Contract No. DE-AC02-06CH11357.
NR 31
TC 7
Z9 7
U1 0
U2 4
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 SEP 14
PY 2010
VL 22
IS 17
BP 4996
EP 5002
DI 10.1021/cm1012679
PG 7
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 645MA
UT WOS:000281461100020
ER
PT J
AU Kim, SH
Halasyamani, PS
Melot, BC
Seshadri, R
Green, MA
Sefat, AS
Mandrus, D
AF Kim, Sang-Hwan
Halasyamani, P. Shiv
Melot, Brent C.
Seshadri, Ram
Green, Mark A.
Sefat, Athena S.
Mandrus, David
TI Experimental and Computational Investigation of the Polar Ferrimagnet
VOSe2O5
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID BOND-VALENCE PARAMETERS; CRYSTAL-STRUCTURE; FERROELECTRICITY;
POLARIZATION; SOLIDS; FIELDS; STATES; TERMS
AB We have re-examined the crystal structure and the physical properties of VOSe2O5 by performing single crystal X-ray and powder neutron diffraction, alternating current (AC) and direct current (DC) magnetization measurements, heat capacity, dielectric properties, and second-harmonic generation (SHG) measurements. From these studies, we observed that the compound undergoes three magnetic transitions near 4, 5.5, and 8 K. In addition, we observed ferrimagnetic behavior as the magnetic ground state, confirmed by the isothermal magnetization measured below 8 K that reveals a saturated magnetic moment of 0.5 mu(B) per formula unit, consistent with density functional calculations of the magnetically ordered ground state. We propose a ferrimagnetic spin arrangement that is consistent with neutron diffraction measurements as well. Frequency dependence in the AC magnetic susceptibility, observed at 5.5 K, is considered as short-range magnetic ordering and may be associated with the competition between nearest neighbor and next nearest neighbor interactions of the V4+ cations. A dielectric anomaly near 240 K and non-centrosymmetric functional properties, notably, second harmonic generation and electric polarization, are also discussed.
C1 [Kim, Sang-Hwan; Halasyamani, P. Shiv] Univ Houston, Dept Chem, Houston, TX 77204 USA.
[Melot, Brent C.; Seshadri, Ram] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA.
[Melot, Brent C.; Seshadri, Ram] Univ Calif Santa Barbara, Mat Res Lab, Santa Barbara, CA 93106 USA.
[Green, Mark A.] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA.
[Green, Mark A.] NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA.
[Sefat, Athena S.; Mandrus, David] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Mandrus, David] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
RP Halasyamani, PS (reprint author), Univ Houston, Dept Chem, 136 Fleming Bldg, Houston, TX 77204 USA.
EM psh@uh.edu
RI Seshadri, Ram/C-4205-2013; Halasyamani, P. Shiv/A-8620-2009; Mandrus,
David/H-3090-2014; Halasyamani, Shiv/J-3438-2014; Melot,
Brent/B-6456-2008; Sefat, Athena/R-5457-2016
OI Seshadri, Ram/0000-0001-5858-4027; Halasyamani,
Shiv/0000-0003-1787-1040; Melot, Brent/0000-0002-7078-8206; Sefat,
Athena/0000-0002-5596-3504
FU Welch Foundation [E-1457]; NSF [DMR-0652150]; ACS PRF [47345-AC10];
National Science Foundation [DMR 0449354]; Division of Materials Science
and Engineering, Office of Basic Energy Sciences; U.S. Department of
Energy [DE-AC05-00OR22725]
FX S.-H.K. and P.S.H. thank the Welch Foundation (Grant E-1457), NSF
(DMR-0652150), and ACS PRF (47345-AC10) for support. B.C.M. and R.S
acknowledge the National Science Foundation for support through Career
Awards to R.S. (DMR 0449354) and for the use of MRSEC facilities at UCSB
(DMR 0520415), D.P. Shoemaker and A. Llobet are thanked for their
assistance in data collection at Los Alamos National Lab. Research is
also sponsored by the Division of Materials Science and Engineering,
Office of Basic Energy Sciences. Oak Ridge National Laboratory is
managed by UT-Battelle, LLC, for the U.S. Department of Energy under
Contract DE-AC05-00OR22725. We acknowledge the support of the National
Institute of Standards and Technology, U.S. Department of Commerce, in
providing the neutron research facilities used in this work. Certain
commercial equipment, instruments, or materials are identified in this
paper to foster understanding. Such identification does not imply
recommendation or endorsement by the National Institute of Standards and
Technology, nor does it imply that the materials or equipment identified
are necessarily the best available for the purpose.
NR 52
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U1 0
U2 8
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 SEP 14
PY 2010
VL 22
IS 17
BP 5074
EP 5083
DI 10.1021/cm1011839
PG 10
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 645MA
UT WOS:000281461100028
ER
PT J
AU Kim, TW
Chung, PW
Lin, VSY
AF Kim, Tae-Wan
Chung, Po-Wen
Lin, Victor S. -Y.
TI Facile Synthesis of Monodisperse Spherical MCM-48 Mesoporous Silica
Nanoparticles with Controlled Particle Size
SO CHEMISTRY OF MATERIALS
LA English
DT Article
ID BINARY SURFACTANT SYSTEM; HUMAN CANCER-CELLS; MOLECULAR-SIEVES;
DRUG-DELIVERY; CONTROLLED-RELEASE; STRUCTURAL CONTROL; CARBON MATERIALS;
RECENT PROGRESS; SPHERES; REPLICATION
AB A rapid and facile synthesis route to the monodisperse spherical MCM-48 mesoporous silica nanoparticles (MSN) with cubic Ia (3) over bard mesostructure is developed based on the modified Stober method. The phase domain of MCM-48-type MSNs can be extended by controlling the stirring rate and molar ratios of silica source and surfactant. The formation of monodispersed spherical MCM-48-type MSNs is obtained using triblock copolymer Pluronic F127 as a particle size designer. The average size of monodisperse spherical MSN can be controlled within the range of 70-500 nm depending on the amount of F127. Moreover, the pore diameter of MSNs can be precisely controllable in pore diameters from 2.3 to 3.3 nm using different alkyl chain surfactants and simple posthydrothermal treatment. An investigation of MCM-48-type MSN materials using powder X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and nitrogen physisorption clearly reveals that MSNs show high specific surface area, high pore volumes, controllable morphological aspects, and tunable pore diameters. The MCM-48-type MSNs thus obtained are demonstrated as a good hard template for the preparation of other mesoporous nanoparticles, such as mesoporous metal oxides. The present discovery of the extended synthesis conditions and the binary surfactant system in MCM-48 synthesis offers reproducible and facile synthesis of the monodisperse spherical MCM-48 mesoporous silica nanoparticles with precise structural control, and thus has vast prospects for future applications of ultrafine mesostructured nanoparticle materials.
C1 [Kim, Tae-Wan] Korea Res Inst Chem Technol, Green Chem Res Div, Taejon 305600, South Korea.
[Chung, Po-Wen; Lin, Victor S. -Y.] Iowa State Univ, Dept Chem, US Dept Energy, Ames Lab, Ames, IA 50011 USA.
RP Kim, TW (reprint author), Korea Res Inst Chem Technol, Green Chem Res Div, POB 107,Sinseongro 19, Taejon 305600, South Korea.
EM twkim@krict.re.kr
RI Chung, Po-Wen/J-7476-2015
FU U.S. DOE Ames Laboratory through the office of Basic Energy Sciences
[DE-AC02-07CH11358]
FX This study was supported by the U.S. DOE Ames Laboratory through the
office of Basic Energy Sciences under Contract DE-AC02-07CH11358.
NR 61
TC 111
Z9 115
U1 17
U2 195
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 SEP 14
PY 2010
VL 22
IS 17
BP 5093
EP 5104
DI 10.1021/cm1017344
PG 12
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 645MA
UT WOS:000281461100030
ER
PT J
AU Kelly, DN
Schwartz, CP
Uejio, JS
Duffin, AM
England, AH
Saykally, RJ
AF Kelly, Daniel N.
Schwartz, Craig P.
Uejio, Jane S.
Duffin, Andrew M.
England, Alice H.
Saykally, Richard J.
TI Communication: Near edge x-ray absorption fine structure spectroscopy of
aqueous adenosine triphosphate at the carbon and nitrogen K-edges
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
ID METAL-ION COMPLEXES; SELF-ASSOCIATION; MACROCHELATE FORMATION; LIQUID
MICROJETS; ADENINE; DNA; NUCLEOBASES; PROTON; OXYGEN; NUCLEOTIDES
AB Near edge x-ray absorption fine structure (NEXAFS) spectroscopy at the nitrogen and carbon K-edges was used to study the hydration of adenosine triphosphate in liquid microjets. The total electron yield spectra were recorded as a function of concentration, pH, and the presence of sodium, magnesium, and copper ions (Na(+)/Mg(2+)/Cu(2+)). Significant spectral changes were observed upon protonation of the adenine ring, but not under conditions that promote pi-stacking, such as high concentration or presence of Mg(2+), indicating that NEXAFS is insensitive to the phenomenon. Intramolecular inner-sphere association of Cu(2+) did create observable broadening of the nitrogen spectrum, whereas outer-sphere association with Mg(2+) did not. (c) 2010 American Institute of Physics. [doi:10.1063/1.3478548]
C1 [Kelly, Daniel N.; Schwartz, Craig P.; Uejio, Jane S.; Duffin, Andrew M.; England, Alice H.; Saykally, Richard J.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Schwartz, Craig P.; Uejio, Jane S.; Duffin, Andrew M.; England, Alice H.; Saykally, Richard J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA.
RP Saykally, RJ (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
EM saykally@berkeley.edu
OI England, Alice/0000-0001-7698-8156
FU Director, Office of Basic Energy Sciences, Office of Science, U.S.
Department of Energy [AC02-05CH11231]; Molecular Foundry; Advanced Light
Source
FX This work was supported by the Director, Office of Basic Energy
Sciences, Office of Science, U.S. Department of Energy under Contract
No. DE-AC02-05CH11231 through the LBNL Chemical Sciences Division, the
Molecular Foundry, and the Advanced Light Source. We wish to thank Wanli
Yang and Jonathan Denlinger for excellent user support of Beamline
8.0.1.
NR 26
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U1 5
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 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD SEP 14
PY 2010
VL 133
IS 10
AR 101103
DI 10.1063/1.3478548
PG 4
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 658FH
UT WOS:000282475400003
PM 20849154
ER
PT J
AU Stottlemyer, AL
Liu, P
Chen, JGG
AF Stottlemyer, Alan Lee
Liu, Ping
Chen, Jingguang G.
TI Comparison of bond scission sequence of methanol on tungsten monocarbide
and Pt-modified tungsten monocarbide
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
ID POTENTIAL APPLICATION; SURFACE REACTIVITIES; BIMETALLIC SURFACES;
STEPPED SURFACE; ETHYLENE-GLYCOL; PLATINUM 111; GROUP METALS;
DECOMPOSITION; PT(111); ADSORPTION
AB The ability to control the bond scission sequence of O-H, C-H, and C-O bonds is of critical importance in the effective utilization of oxygenate molecules, such as in reforming reactions and in alcohol fuel cells. In the current study, we use methanol as a probe molecule to demonstrate the possibility to control the decomposition pathways by supporting monolayer coverage of Pt on a tungsten monocarbide (WC) surface. Density functional theory (DFT) results reveal that on the WC and Pt/WC surfaces CH(3)OH decomposes via O-H bond scission to form the methoxy (*CH(3) O) intermediate. The subsequent decomposition of methoxy on the WC surface occurs through the C-O bond scission to form *CH(3), which reacts with surface *H to produce CH(4). In contrast, the decomposition of methoxy on the Pt/WC surface favors the C-H bond scission to produce *CH(2) O, which prevents the formation of the *CH(3) species and leads to the formation of a *CO intermediate through subsequent deprotonation steps. The DFT predictions are validated using temperature programmed desorption to quantify the gas-phase product yields and high resolution electron energy loss spectroscopy to determine the surface intermediates from methanol decomposition on Pt, WC, and Pt/WC surfaces. (C) 2010 American Institute of Physics. [doi:10.1063/1.3488056]
C1 [Stottlemyer, Alan Lee; Chen, Jingguang G.] Univ Delaware, Ctr Catalyt Sci & Technol, Dept Chem Engn, Newark, DE 19716 USA.
[Liu, Ping] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
RP Chen, JGG (reprint author), Univ Delaware, Ctr Catalyt Sci & Technol, Dept Chem Engn, Newark, DE 19716 USA.
EM jgchen@udel.edu
FU Basic Energy Sciences of the Department of Energy (DOE/BES)
[DE-FG02-00ER15104]; NASA [NNG05GO92H]
FX The authors acknowledge support from the Basic Energy Sciences of the
Department of Energy (DOE/BES Grant No. DE-FG02-00ER15104). A.L.S.
acknowledges support from the NASA Delaware Space Grant College and
Fellowship Program (NASA Grant No. NNG05GO92H). DFT calculations were
carried out using computational resources at Center for Functional
Nanomaterials, Brookhaven National Laboratory, which is supported by the
U.S. DOE/BES, under Contract No. DE-AC02-98CH10886.
NR 45
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U1 2
U2 35
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 SEP 14
PY 2010
VL 133
IS 10
AR 104702
DI 10.1063/1.3488056
PG 8
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 658FH
UT WOS:000282475400030
PM 20849181
ER
PT J
AU Colgan, J
Abdallah, J
Faenov, AY
Pikuz, TA
Skobelev, IY
Flora, F
Francucci, M
Martellucci, S
AF Colgan, J.
Abdallah, J., Jr.
Faenov, A. Ya
Pikuz, T. A.
Skobelev, I. Yu
Flora, F.
Francucci, M.
Martellucci, S.
TI Model calculations and measurements of the emission of a barium plasma
in the spectral range of high-n Rydberg levels in a near Ni-like state
SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
LA English
DT Article
ID X-RAY-SPECTRUM; WAVELENGTH RANGE; IONIZATION; ANGSTROM
AB The Los Alamos suite of atomic codes is used to model several high-resolution spectral measurements from recent laser-produced plasma experiments involving barium fluoride targets. The spectral range of observation is from 7.8 to 9.5 angstrom and the observed lines correspond to 3-5, 3-6, 3-7 and 3-8 transitions of principal quantum number, for Ga-like through Co-like barium ions. The observed spectra are complicated because of many overlapping lines from the various ion stages in a small wavelength region. A MUTA model that includes many configurations is compared to a detailed level-to-level collisional-radiative model that includes fewer configurations. Spectra are calculated to show the sensitivity to plasma temperature, density and size. The contributions to the spectra for the individual ion stages are also presented. The model calculations are in reasonable agreement with experiment.
C1 [Colgan, J.; Abdallah, J., Jr.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Faenov, A. Ya; Pikuz, T. A.; Skobelev, I. Yu] Russian Acad Sci, Joint Inst High Temp, Moscow 125412, Russia.
[Flora, F.] ENEA, Dipartimento Innovaz, Settore Fis Applicata, I-00044 Frascati, Roma, Italy.
[Francucci, M.; Martellucci, S.] Univ Roma Tor Vergata, INFM, Dipartimento Sci & Tecnol Fis & Energet, I-00133 Rome, Italy.
RP Colgan, J (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
EM jcolgan@lanl.gov
OI Colgan, James/0000-0003-1045-3858
FU US Department of Energy [DE-AC5206NA25396]; RFBR [10-07-00227a]; ISTC
[3504]; RAS Presidium [12]
FX The Los Alamos National Laboratory is operated by Los Alamos National
Security, LLC for the National Nuclear Security Administration of the US
Department of Energy under contract no DE-AC5206NA25396. This research
was partially supported by the RFBR Project 10-07-00227a, ISTC Grant No.
3504, and by the RAS Presidium Program of basic researches No. 12.
NR 20
TC 1
Z9 1
U1 0
U2 1
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-4075
EI 1361-6455
J9 J PHYS B-AT MOL OPT
JI J. Phys. B-At. Mol. Opt. Phys.
PD SEP 14
PY 2010
VL 43
IS 17
SI SI
AR 175701
DI 10.1088/0953-4075/43/17/175701
PG 9
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 646HO
UT WOS:000281530200012
ER
PT J
AU Hinestrosa, JP
Alonzo, J
Osa, M
Kilbey, SM
AF Hinestrosa, Juan Pablo
Alonzo, Jose
Osa, Masashi
Kilbey, S. Michael, II
TI Solution Behavior of Polystyrene-Polyisoprene Miktoarm Block Copolymers
in a Selective Solvent for Polyisoprene
SO MACROMOLECULES
LA English
DT Article
ID BRANCHED MACROMOLECULES; LIGHT-SCATTERING; MICELLES; MICELLIZATION;
ARCHITECTURE; POLYMERS; DEPENDENCE; STARS; SIZE
AB The dynamics and self-assembly of polystyrene- (PS-) polyisoprene (PI) miktoarm (mixed-arm) block copolymers in n-hexane, a selective solvent for PI, are investigated. The miktoarms present a branched arrangement in the soluble block in the fashion of PI-(PI)2, where two PI blocks are connected by a common end point to a linear PS-PI diblock. It is found that these copolymers self-assemble into spherical micelles having cores composed of the insoluble PS blocks and coronas of the well-solvated PI-(PI)(2) blocks. Micelles formed from the branched polymer amphiphiles are more compact, having smaller sizes than the micelles formed from a linear PS-PI diblock copolymer of similar molecular weight and composition. As the concentration is decreased, the micelles with large aggregation numbers remain stable, only showing changes in the aggregation number. The hydrodynamic sizes and aggregation numbers determined from the micelles formed from miktoarm copolymers differ from theoretical predictions for spherical micelles made of the equivalent linear amphiphilic diblock copolymers. These differences may arise from the arrangements of the branched blocks inside the micellar corona.
C1 [Kilbey, S. Michael, II] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA.
[Hinestrosa, Juan Pablo; Alonzo, Jose] Clemson Univ, Dept Chem & Biomol Engn, Clemson, SC 29634 USA.
[Osa, Masashi] Kyoto Univ, Dept Polymer Chem, Kyoto 6158510, Japan.
[Kilbey, S. Michael, II] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
RP Kilbey, SM (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA.
FU American Chemical Society; Oak Ridge National Laboratory by the Division
of Scientific User Facilities, U.S. Department of Energy [2008-297]
FX The donors of the Petroleum Research Fund, administered by the American
Chemical Society, are gratefully acknowledged for partial support of
this work. A portion of this work was conducted at the Center for
Nanophase Materials Sciences (enabled through User Project 2008-297),
which is sponsored at Oak Ridge National Laboratory by the Division of
Scientific User Facilities, U.S. Department of Energy. Professor Paul
Russo of Louisiana State University is acknowledged for fruitful
discussions and Professor Jimmy W. Mays of the University of Tennessee,
Knoxville is thanked for providing the materials used also in this
study.
NR 43
TC 9
Z9 9
U1 0
U2 10
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0024-9297
EI 1520-5835
J9 MACROMOLECULES
JI Macromolecules
PD SEP 14
PY 2010
VL 43
IS 17
BP 7294
EP 7304
DI 10.1021/ma100428a
PG 11
WC Polymer Science
SC Polymer Science
GA 645PG
UT WOS:000281474500050
ER
PT J
AU Law, KJH
Saxena, A
Kevrekidis, PG
Bishop, AR
AF Law, K. J. H.
Saxena, Avadh
Kevrekidis, P. G.
Bishop, A. R.
TI Stable structures with high topological charge in nonlinear photonic
quasicrystals
SO PHYSICAL REVIEW A
LA English
DT Article
ID SCHRODINGER LATTICES; DISCRETE SOLITONS; OPTICAL VORTICES; VORTEX
SOLITONS; STABILITY; WAVE
AB Stable vortices with topological charges of 3 and 4 are examined numerically and analytically in photonic quasicrystals created by interference of five as well as eight beams, for cubic as well as saturable nonlinearities. Direct numerical simulations corroborate the analytical and numerical linear stability analysis predictions for such experimentally realizable structures.
C1 [Law, K. J. H.] Univ Warwick, Warwick Math Inst, Coventry CV4 7AL, W Midlands, England.
[Law, K. J. H.; Kevrekidis, P. G.] Univ Massachusetts, Dept Math & Stat, Amherst, MA 01003 USA.
[Saxena, Avadh; Bishop, A. R.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Saxena, Avadh; Bishop, A. R.] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA.
RP Law, KJH (reprint author), Univ Warwick, Warwick Math Inst, Coventry CV4 7AL, W Midlands, England.
EM kodylaw@gmail.com
RI Law, Kody/A-6375-2010;
OI Law, Kody/0000-0003-3133-2537
FU NSF; DOE
FX K.J.H.L. acknowledges LANL and CNLS for hospitality. The work was
supported by the NSF and DOE.
NR 31
TC 6
Z9 6
U1 2
U2 4
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1050-2947
EI 1094-1622
J9 PHYS REV A
JI Phys. Rev. A
PD SEP 14
PY 2010
VL 82
IS 3
AR 035802
DI 10.1103/PhysRevA.82.035802
PG 4
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 650JV
UT WOS:000281846100014
ER
PT J
AU Zhang, ZX
Hung, HH
Ho, CM
Zhao, E
Liu, WV
AF Zhang, Zixu
Hung, Hsiang-Hsuan
Ho, Chiu Man
Zhao, Erhai
Liu, W. Vincent
TI Modulated pair condensate of p-orbital ultracold fermions
SO PHYSICAL REVIEW A
LA English
DT Article
AB We show that an interesting kind of pairing occurs for spin-imbalanced Fermi gases under a specific experimental condition-the spin up and spin down Fermi levels lying within the p(x) and s orbital bands of an optical lattice, respectively. The pairs condense at a finite momentum equal to the sum of the two Fermi momenta of spin up and spin down fermions and form a p-orbital pair condensate. This 2k(F) momentum dependence has been seen before in spin-and charge-density waves, but it differs from the usual p-wave superfluids such as (3)He, where the orbital symmetry refers to the relative motion within each pair. Our conclusion is based on the density matrix renormalization group analysis for the one-dimensional (1D) system and mean-field theory for the quasi-1D system. The phase diagram of the quasi-1D system is calculated, showing that the p-orbital pair condensate occurs in a wide range of fillings. In the strongly attractive limit, the system realizes an unconventional BEC beyond Feynman's no-node theorem. The possible experimental signatures of this phase in molecule projection experiment are discussed.
C1 [Zhang, Zixu; Zhao, Erhai; Liu, W. Vincent] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA.
[Hung, Hsiang-Hsuan] Univ Calif San Diego, Dept Phys, San Diego, CA 92093 USA.
[Ho, Chiu Man] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Ho, Chiu Man] Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA.
[Ho, Chiu Man] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA.
RP Zhang, ZX (reprint author), Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA.
RI Zhang, Zixu/F-8658-2010; Ho, Chiu Man /C-2741-2013; Zhao,
Erhai/B-3463-2010
OI Zhao, Erhai/0000-0001-8954-1601
FU ARO [W911NF-07-1-0293]
FX We thank Chungwei Lin for helpful discussions. This work is supported by
ARO Grant No. W911NF-07-1-0293.
NR 25
TC 15
Z9 15
U1 0
U2 4
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 SEP 14
PY 2010
VL 82
IS 3
AR 033610
DI 10.1103/PhysRevA.82.033610
PG 6
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 650JV
UT WOS:000281846100011
ER
PT J
AU Boukharouba, N
Bateman, FB
Brient, CE
Carlson, AD
Grimes, SM
Haight, RC
Massey, TN
Wasson, OA
AF Boukharouba, N.
Bateman, F. B.
Brient, C. E.
Carlson, A. D.
Grimes, S. M.
Haight, R. C.
Massey, T. N.
Wasson, O. A.
TI Measurement of the n-p elastic scattering angular distribution at E-n =
10 MeV (vol 65, 014004, 2001)
SO PHYSICAL REVIEW C
LA English
DT Correction
AB The reported data are given for the mean angles measured rather than for the central angles. The data are normalized to the most recent Evaluated Nuclear Data File evaluated angle-integrated elastic-scattering cross section and refitted with a Legendre polynomial expansion.
C1 [Boukharouba, N.] Univ Guelma, Dept Phys, Guelma 24000, Algeria.
[Bateman, F. B.; Carlson, A. D.; Wasson, O. A.] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA.
[Brient, C. E.; Grimes, S. M.; Massey, T. N.] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA.
[Haight, R. C.] Los Alamos Natl Lab, Los Alamos Neutron Sci Ctr, Los Alamos, NM 87545 USA.
RP Boukharouba, N (reprint author), Univ Guelma, Dept Phys, Guelma 24000, Algeria.
NR 6
TC 0
Z9 0
U1 1
U2 2
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 SEP 14
PY 2010
VL 82
IS 3
AR 039901
DI 10.1103/PhysRevC.82.039901
PG 1
WC Physics, Nuclear
SC Physics
GA 650JF
UT WOS:000281844400003
ER
PT J
AU Cooper, F
Khare, A
Mihaila, B
Saxena, A
AF Cooper, Fred
Khare, Avinash
Mihaila, Bogdan
Saxena, Avadh
TI Solitary waves in the nonlinear Dirac equation with arbitrary
nonlinearity
SO PHYSICAL REVIEW E
LA English
DT Article
ID SCHRODINGER-EQUATION; FIELD-THEORIES; SPINOR FIELDS; STABILITY; MODEL
AB We consider the nonlinear Dirac equations (NLDE's) in 1 + 1 dimension with scalar- scalar self interaction g(2)/k+1((Psi) over bar Psi)(k+1), as well as a vector- vector self interaction g(2)/k+1((Psi) over bar gamma(mu)Psi(Psi) over bar gamma(omega Psi))(k+1). We find the exact analytic form for solitary waves for arbitrary k and find that they are a generalization of the exact solutions for the nonlinear Schrodinger equation (NLSE) and reduce to these solutions in a well defined nonrelativistic limit. We perform the nonrelativistic reduction and find the 1/2m correction to the NLSE, valid when vertical bar omega-m vertical bar << 2m, where omega is the frequency of the solitary wave in the rest frame. We discuss the stability and blowup of solitary waves assuming the modified NLSE is valid and find that they should be stable for k < 2.
C1 [Cooper, Fred] Santa Fe Inst, Santa Fe, NM 87501 USA.
[Cooper, Fred; Saxena, Avadh] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Cooper, Fred; Saxena, Avadh] Los Alamos Natl Lab, Ctr Nonlinear Studies, Los Alamos, NM 87545 USA.
[Khare, Avinash] Inst Phys, Bhubaneswar 751005, Orissa, India.
[Mihaila, Bogdan] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
RP Cooper, F (reprint author), Santa Fe Inst, Santa Fe, NM 87501 USA.
EM fcooper@lanl.gov; khare@iopb.res.in; bmihaila@lanl.gov; avadh@lanl.gov
RI Mihaila, Bogdan/D-8795-2013
OI Mihaila, Bogdan/0000-0002-1489-8814
FU U.S. Department of Energy
FX This work was performed in part under the auspices of the U.S.
Department of Energy. F. C. and B. M. would like to thank the Santa Fe
Institute for its hospitality during the completion of this work. A. K.
would like to thank Center for Nonlinear Studies, Los Alamos National
Laboratory, for warm hospitality during his stay. F. C. would like to
thank T. Goldman for useful conversations about the nonrelativistic
reduction of the Dirac equation.
NR 28
TC 21
Z9 21
U1 0
U2 2
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 SEP 14
PY 2010
VL 82
IS 3
AR 036604
DI 10.1103/PhysRevE.82.036604
PN 2
PG 14
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 650SW
UT WOS:000281873700006
PM 21230200
ER
PT J
AU Kress, JD
Cohen, JS
Horner, DA
Lambert, F
Collins, LA
AF Kress, J. D.
Cohen, James S.
Horner, D. A.
Lambert, F.
Collins, L. A.
TI Viscosity and mutual diffusion of deuterium-tritium mixtures in the
warm-dense-matter regime
SO PHYSICAL REVIEW E
LA English
DT Article
ID ONE-COMPONENT PLASMA; MOLECULAR-DYNAMICS SIMULATIONS; TOTAL-ENERGY
CALCULATIONS; IGNITION TARGET DESIGNS; LIQUID MODEL MIXTURES; BINARY
IONIC MIXTURES; JONES 12-6 POTENTIALS; EQUATION-OF-STATE; WAVE
BASIS-SET; TRANSPORT-COEFFICIENTS
AB We have calculated viscosity and mutual diffusion of deuterium-tritium (DT) in the warm, dense matter regime for densities from 5 to 20 g/cm(3) and temperatures from 2 to 10 eV, using both finite-temperature Kohn-Sham density-functional theory molecular dynamics (QMD) and orbital-free molecular dynamics (OFMD). The OFMD simulations are in generally good agreement with the benchmark QMD results, and we conclude that the simpler OFMD method can be used with confidence in this regime. For low temperatures (3 eV and below), one-component plasma (OCP) model simulations for diffusion agree with the QMD and OFMD calculations, but deviate by 30% at 10 eV. In comparison with the QMD and OFMD results, the OCP viscosities are not as good as for diffusion, especially for 5 g/cm3 where the temperature dependence is significantly different. The QMD and OFMD reduced diffusion and viscosity coefficients are found to depend largely, though not completely, only on the Coulomb coupling parameter Gamma, with a minimum in the reduced viscosity at Gamma approximate to 25, approximately the same position found in the OCP simulations. The QMD and OFMD equations of state (pressure) are also compared with the hydrogen two-component plasma model.
C1 [Kress, J. D.; Cohen, James S.; Horner, D. A.; Collins, L. A.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Lambert, F.] DIF, DAM, CEA, F-91297 Arpajon, France.
RP Kress, JD (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
FU Advanced Simulation and Computing Program; U.S. Department of Energy
[DE-AC52-06NA25396]
FX This work was supported by the Advanced Simulation and Computing
Program. The 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.
NR 52
TC 35
Z9 36
U1 0
U2 9
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 SEP 14
PY 2010
VL 82
IS 3
AR 036404
DI 10.1103/PhysRevE.82.036404
PN 2
PG 10
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 650SW
UT WOS:000281873700005
PM 21230193
ER
PT J
AU Baker, SE
Pocha, MD
Chang, ASP
Sirbuly, DJ
Cabrini, S
Dhuey, SD
Bond, TC
Letant, SE
AF Baker, Sarah E.
Pocha, Michael D.
Chang, Allan S. P.
Sirbuly, Donald J.
Cabrini, Stefano
Dhuey, Scott D.
Bond, Tiziana C.
Letant, Sonia E.
TI Detection of bio-organism simulants using random binding on a
defect-free photonic crystal
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID VIRUS; MICROCAVITY; SENSOR
AB The defect-free photonic crystal (PC) slab geometry was explored for size-selective detection of bio-organism simulants. Through feedback between finite-difference time-domain simulations and experiments, we generated a conservative limit of detection estimate for randomized pore filling of a two-dimensional PC slab, and predict that random binding affords the label-free PC-based optical detection of low numbers (of the order of 10) of biological particles. (C) 2010 American Institute of Physics. [doi:10.1063/1.3487998]
C1 [Baker, Sarah E.; Pocha, Michael D.; Chang, Allan S. P.; Sirbuly, Donald J.; Bond, Tiziana C.; Letant, Sonia E.] Lawrence Livermore Natl Lab, Phys & Life Sci & Engn Directorates, Livermore, CA 94550 USA.
[Cabrini, Stefano; Dhuey, Scott D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Mol Foundry, Berkeley, CA 94720 USA.
RP Baker, SE (reprint author), Lawrence Livermore Natl Lab, Phys & Life Sci & Engn Directorates, 7000 E Ave, Livermore, CA 94550 USA.
EM baker74@llnl.gov
FU U.S. Department of Energy, Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]; Laboratory Directed Research and Development
[TC09-LW-003]; Office of Science, Office of Basic Energy Sciences, of
the U.S. Department of Energy [DE-AC02-05CH11231]
FX This work was performed under the auspices of the U.S. Department of
Energy by Lawrence Livermore National Laboratory under Contract No.
DE-AC52-07NA27344. Funding for this research was provided by a
Laboratory Directed Research and Development Grant No. TC09-LW-003.
Portions of this work (fabrication) were performed with a user grant at
the Molecular Foundry, Lawrence Berkeley National Laboratory, 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. We
thank Corey Bennett, Bryan Moran, and Vincent Hernandez at Lawrence
Livermore National Laboratory for valuable contributions, Rel. No.
LLNL-JRNL-432541.
NR 20
TC 6
Z9 6
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 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD SEP 13
PY 2010
VL 97
IS 11
AR 113701
DI 10.1063/1.3487998
PG 3
WC Physics, Applied
SC Physics
GA 652TN
UT WOS:000282032900081
ER
PT J
AU Gan, ZQ
Liu, R
Shinar, R
Shinar, J
AF Gan, Zhengqing
Liu, Rui
Shinar, Ruth
Shinar, Joseph
TI Transient electroluminescence dynamics in small molecular organic
light-emitting diodes
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID STRETCHED-EXPONENTIAL RELAXATION; NUMERICAL-MODEL; DEVICES; FIELD;
RECOMBINATION; DIFFUSION; ARRAYS
AB Intriguing electroluminescence (EL) spikes, following a voltage pulse applied to small molecular OLEDs, are discussed, elucidating carrier and exciton quenching dynamics and their relation to device structure. At low temperatures, all devices exhibit spikes at similar to 70-300 ns and mu s-long tails. At 295 K only those with a hole injection barrier, carrier-trapping guest-host emitting layer, and no strong hole-blocking layer exhibit the spikes. They narrow and appear earlier under post-pulse reverse bias. The spikes and tails are in agreement with a revised model of recombination of correlated charge pairs (CCPs) and initially unpaired charges. Decreased post-pulse field-induced dissociative quenching of singlet excitons and CCPs, and possibly increased post-pulse current of holes that "turn back" toward the recombination zone after having drifted beyond it are suspected to cause the spikes' amplitude, which exceeds the dc EL. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3481687]
C1 [Gan, Zhengqing; Liu, Rui; Shinar, Joseph] Iowa State Univ, Ames Lab, USDOE, Ames, IA 50011 USA.
[Gan, Zhengqing; Liu, Rui; Shinar, Joseph] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Shinar, Ruth] Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA.
[Shinar, Ruth] Iowa State Univ, Microelect Res Ctr, Ames, IA 50011 USA.
RP Shinar, R (reprint author), Iowa State Univ, Microelect Res Ctr, Ames, IA 50011 USA.
EM rshinar@iastate.edu; jshinar@iastate.edu
FU U.S. Department of Energy (USDOE) [DE-AC 02-07CH11358]
FX Ames Laboratory is operated by Iowa State University for the U.S.
Department of Energy (USDOE) under Contract No. DE-AC 02-07CH11358. This
work was supported by the Director for Energy Research, Basic Energy
Sciences, USDOE.
NR 21
TC 11
Z9 12
U1 2
U2 12
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 SEP 13
PY 2010
VL 97
IS 11
AR 113301
DI 10.1063/1.3481687
PG 3
WC Physics, Applied
SC Physics
GA 652TN
UT WOS:000282032900071
ER
PT J
AU Kumar, A
Denev, S
Zeches, RJ
Vlahos, E
Podraza, NJ
Melville, A
Schlom, DG
Ramesh, R
Gopalan, V
AF Kumar, Amit
Denev, Sava
Zeches, Robert J.
Vlahos, Eftihia
Podraza, Nikolas J.
Melville, Alexander
Schlom, Darrell G.
Ramesh, R.
Gopalan, Venkatraman
TI Probing mixed tetragonal/rhombohedral-like monoclinic phases in strained
bismuth ferrite films by optical second harmonic generation
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID BIFEO3
AB Epitaxial strain can induce the formation of morphotropic phase boundary in lead free ferroelectrics like bismuth ferrite, thereby enabling the coexistence of tetragonal and rhombohedral phases in the same film. The relative ratio of these phases is governed by the film thickness and theoretical studies suggest that there exists a monoclinic distortion of both the tetragonal as well as the rhombohedral unit cells due to imposed epitaxial strain. In this work we show that optical second harmonic generation can distinguish the tetragonal-like phase from the rhombohedral-like phase and enable detection of monoclinic distortion in only a pure tetragonal-like phase. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3483923]
C1 [Kumar, Amit; Denev, Sava; Vlahos, Eftihia; Podraza, Nikolas J.; Gopalan, Venkatraman] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA.
[Zeches, Robert J.; Ramesh, R.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
[Melville, Alexander; Schlom, Darrell G.] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA.
[Ramesh, R.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Kumar, A (reprint author), Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA.
EM sad22@psu.edu
RI Kumar, Amit/C-9662-2012; Schlom, Darrell/J-2412-2013
OI Kumar, Amit/0000-0002-1194-5531; Schlom, Darrell/0000-0003-2493-6113
FU National Science Foundation [DMR-0820404, DMR-0908718]
FX We acknowledge support from the National Science Foundation through
Grant Nos. DMR-0820404 and DMR-0908718.
NR 7
TC 16
Z9 16
U1 2
U2 26
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 SEP 13
PY 2010
VL 97
IS 11
AR 112903
DI 10.1063/1.3483923
PG 3
WC Physics, Applied
SC Physics
GA 652TN
UT WOS:000282032900056
ER
PT J
AU Lingnau, B
Ludge, K
Scholl, E
Chow, WW
AF Lingnau, Benjamin
Luedge, Kathy
Schoell, Eckehard
Chow, Weng W.
TI Many-body and nonequilibrium effects on relaxation oscillations in a
quantum-dot microcavity laser
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID DYNAMICS; POPULATION
AB We investigate many-body and nonequilibrium effects on the dynamical behavior of a quantum-dot laser diode. Simulations, based on the Maxwell-semiconductor-Bloch equations, show strong dependence of the turn-on delay on initial cavity detuning, because of a dynamical shift in the quantum-dot distribution caused by band gap renormalization. Gain switch behavior is found to be insensitive to inhomogeneous broadening, because the balancing between many-body and free-carrier effects inhibits a cavity resonance walk-off. Both the relaxation oscillation damping and frequency are found to increase with decreasing inhomogeneous broadening widths. However, in contrast to bulk and quantum-well lasers, oscillation damping increases less than the frequency. (C) 2010 American Institute of Physics. [doi:10.1063/1.3488004]
C1 [Lingnau, Benjamin; Luedge, Kathy; Schoell, Eckehard] Tech Univ Berlin, Inst Theoret Phys, D-10623 Berlin, Germany.
[Chow, Weng W.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Lingnau, B (reprint author), Tech Univ Berlin, Inst Theoret Phys, D-10623 Berlin, Germany.
EM lingnau@itp.tu-berlin.de
FU DFG; U.S. Department of Energy [DE-AC04-94AL85000]; Alexander von
Humboldt Foundation
FX This work was supported by DFG within SFB 787, U.S. Department of Energy
under Contract No. DE-AC04-94AL85000 and Alexander von Humboldt
Foundation.
NR 22
TC 7
Z9 7
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 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD SEP 13
PY 2010
VL 97
IS 11
AR 111102
DI 10.1063/1.3488004
PG 3
WC Physics, Applied
SC Physics
GA 652TN
UT WOS:000282032900002
ER
PT J
AU Mihajlovic, G
Schreiber, DK
Liu, YZ
Pearson, JE
Bader, SD
Petford-Long, AK
Hoffmann, A
AF Mihajlovic, Goran
Schreiber, Daniel K.
Liu, Yuzi
Pearson, John E.
Bader, Samuel D.
Petford-Long, Amanda K.
Hoffmann, Axel
TI Enhanced spin signals due to native oxide formation in Ni80Fe20/Ag
lateral spin valves
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE galvanomagnetic effects; iron alloys; nickel alloys; silver; spin
valves; transmission electron microscopy
ID ROOM-TEMPERATURE; INJECTION; FILMS; DIFFUSION; CURRENTS
AB Large nonlocal spin valve signals are reported in mesoscopic Ni80Fe20/Ag lateral spin valves upon exposing them to air. Magnetotransport measurements combined with transmission electron microscopy show that the formation of a native oxide layer at the Ni80Fe20/Ag interface is responsible for the large signals. The results indicate that lateral spin valves with superior performance to those based on high-resistance tunnel barriers can be achieved via controllable growth of native permalloy oxides. (c) 2010 American Institute of Physics. [doi:10.1063/1.3484141]
C1 [Mihajlovic, Goran; Schreiber, Daniel K.; Liu, Yuzi; Pearson, John E.; Bader, Samuel D.; Petford-Long, Amanda K.; Hoffmann, Axel] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Schreiber, Daniel K.; Petford-Long, Amanda K.] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA.
[Bader, Samuel D.; Petford-Long, Amanda K.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
RP Mihajlovic, G (reprint author), Hitachi Global Storage Technol, San Jose Res Ctr, San Jose, CA 95135 USA.
EM hoffmann@anl.gov
RI Bader, Samuel/A-2995-2013; Hoffmann, Axel/A-8152-2009; Petford-Long,
Amanda/P-6026-2014; Liu, Yuzi/C-6849-2011
OI Hoffmann, Axel/0000-0002-1808-2767; Petford-Long,
Amanda/0000-0002-3154-8090;
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-06CH11357]
FX We thank O. Mosendz, R. Winkler, and F. Fradin for many stimulating
discussions. This work was supported by the U.S. Department of Energy,
Office of Science, Office of Basic Energy Sciences under Contract No.
DE-AC02-06CH11357. The electron microscopy was accomplished at the
Electron Microscopy Center for Materials Research at Argonne National
Laboratory.
NR 31
TC 20
Z9 20
U1 1
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 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD SEP 13
PY 2010
VL 97
IS 11
AR 112502
DI 10.1063/1.3484141
PG 3
WC Physics, Applied
SC Physics
GA 652TN
UT WOS:000282032900045
ER
PT J
AU Park, M
Hong, S
Klug, JA
Bedzyk, MJ
Auciello, O
No, K
Petford-Long, A
AF Park, Moonkyu
Hong, Seungbum
Klug, Jeffrey A.
Bedzyk, Michael J.
Auciello, Orlando
No, Kwangsoo
Petford-Long, Amanda
TI Three-dimensional ferroelectric domain imaging of epitaxial BiFeO3 thin
films using angle-resolved piezoresponse force microscopy
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID HETEROSTRUCTURES; MULTIFERROICS; POLARIZATION; MEMORIES
AB Here we introduce angle-resolved piezoresponse force microscopy (AR-PFM), whereby the sample is rotated by 30 degrees increments around the surface normal vector and the in-plane PFM phase signals are collected at each angle. We obtained the AR-PFM images of BaTiO3 single crystal and cube-on-cube epitaxial (001) BiFeO3 (BFO) thin film on SrRuO3/SrTiO3 substrate, and confirmed that the AR-PFM provides more unambiguous information on the in-plane polarization directions than the conventional PFM method. Moreover, we found eight additional in-plane polarization variants in epitaxial BFO thin films, which are formed to mitigate highly unstable charged domain boundaries. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3487933]
C1 [Park, Moonkyu; Hong, Seungbum; Klug, Jeffrey A.; Bedzyk, Michael J.; Auciello, Orlando] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Auciello, Orlando; Petford-Long, Amanda] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
[Park, Moonkyu; No, Kwangsoo] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea.
[Klug, Jeffrey A.; Bedzyk, Michael J.] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA.
[Bedzyk, Michael J.] Northwestern Univ, Dept Mat Sci, Evanston, IL 60208 USA.
RP Hong, S (reprint author), Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
EM hong@anl.gov; ksno@kaist.ac.kr
RI No, Kwangsoo/G-4891-2010; Bedzyk, Michael/B-7503-2009; No,
Kwangsoo/C-1983-2011; Hong, Seungbum/B-7708-2009; Klug,
Jeffrey/A-3653-2013; Bedzyk, Michael/K-6903-2013; Petford-Long,
Amanda/P-6026-2014
OI Hong, Seungbum/0000-0002-2667-1983; Petford-Long,
Amanda/0000-0002-3154-8090
FU U.S. Department of Energy Office of Science laboratory [DE-AC02-
06CH11357]; MRSEC [DMR-0520513]; MEST [2010-0015063, 2009-0081946]
FX 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. The U. S. Government retains for
itself, and others acting on its behalf, a paid-up nonexclusive,
irrevocable worldwide license in said article to reproduce, prepare
derivative works, distribute copies to the public, and perform publicly
and display publicly, by or on behalf of the Government. The XRD
facility at NU is supported by MRSEC Grant No. DMR-0520513 from the
National Science Foundation. M.P. and K.N. acknowledge the financial
support by Mid-career Researcher Program (Grant No. 2010-0015063) and
Nano R&D Program (Grant No. 2009-0081946) through NRF grant funded by
the MEST. We thank Professor A. Gruverman at University of Nebraska for
his critical reading of our manuscript.
NR 16
TC 28
Z9 28
U1 2
U2 46
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 SEP 13
PY 2010
VL 97
IS 11
AR 112907
DI 10.1063/1.3487933
PG 3
WC Physics, Applied
SC Physics
GA 652TN
UT WOS:000282032900060
ER
PT J
AU Safarik, DJ
Salje, EKH
Lashley, JC
AF Safarik, D. J.
Salje, E. K. H.
Lashley, J. C.
TI Spectral analysis of resonance ultrasonic spectroscopy: Kramers-Kronig
analysis, Fano profiles, and the case of precursor softening in SnTe:Cr
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID PHASE-TRANSITIONS; MINERALS; WALLS
AB The analysis of resonant ultrasound spectroscopy (RUS) spectra is exemplified by the study of elastic softening in single-crystal Sn(0.995)Cr(0.005)Te near the ferroelastic phase transition at T similar or equal to 100 K. Kramers-Kronig analysis of the resonance peaks shows that the elastic response is linear over the entire temperature range. In the paraelastic phase the Cole-Cole plots of the RUS spectra are circles with small gaps that are related to linear damping. In the ferroelastic phase strong coupling with domain boundary movement occurs, and results in distortion of the Cole-Cole circles. The RUS line profiles in the ferroelastic phase are well-described by the sum of a resonance term and a Fano spectrum with a Fano parameter of q=0.46. The general equations and some simple approximations, which can conveniently be used to analyze RUS spectra, are summarized. We expect that this analysis is transportable to a large parameter space and can be applied to most RUS spectra for both ferroic and nonferroic materials. (C) 2010 American Institute of Physics. [doi:10.1063/1.3489376]
C1 [Safarik, D. J.; Salje, E. K. H.; Lashley, J. C.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Salje, E. K. H.] Univ Cambridge, Dept Earth Sci, Cambridge CB2 3EQ, England.
RP Safarik, DJ (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
EM dsafarik@lanl.gov
RI Salje, Ekhard/M-2931-2013;
OI Salje, Ekhard/0000-0002-8781-6154; Safarik, Douglas/0000-0001-8648-9377
FU Department of Energy
FX This work was supported in part by the Department of Energy's Laboratory
Directed Research and Development Program.
NR 36
TC 11
Z9 11
U1 0
U2 10
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 SEP 13
PY 2010
VL 97
IS 11
AR 111907
DI 10.1063/1.3489376
PG 3
WC Physics, Applied
SC Physics
GA 652TN
UT WOS:000282032900025
ER
PT J
AU Rodionov, DA
Yang, C
Li, XQ
Rodionova, IA
Wang, YB
Obraztsova, AY
Zagnitko, OP
Overbeek, R
Romine, MF
Reed, S
Fredrickson, JK
Nealson, KH
Osterman, AL
AF Rodionov, Dmitry A.
Yang, Chen
Li, Xiaoqing
Rodionova, Irina A.
Wang, Yanbing
Obraztsova, Anna Y.
Zagnitko, Olga P.
Overbeek, Ross
Romine, Margaret F.
Reed, Samantha
Fredrickson, James K.
Nealson, Kenneth H.
Osterman, Andrei L.
TI Genomic encyclopedia of sugar utilization pathways in the Shewanella
genus
SO BMC GENOMICS
LA English
DT Article
ID ESCHERICHIA-COLI; ONEIDENSIS MR-1; SP-NOV.; SUCROSE UTILIZATION;
METABOLISM; CARBON; IDENTIFICATION; BACTERIUM; RECONSTRUCTION;
PUTREFACIENS
AB Background: Carbohydrates are a primary source of carbon and energy for many bacteria. Accurate projection of known carbohydrate catabolic pathways across diverse bacteria with complete genomes constitutes a substantial challenge due to frequent variations in components of these pathways. To address a practically and fundamentally important challenge of reconstruction of carbohydrate utilization machinery in any microorganism directly from its genomic sequence, we combined a subsystems-based comparative genomic approach with experimental validation of selected bioinformatic predictions by a combination of biochemical, genetic and physiological experiments.
Results: We applied this integrated approach to systematically map carbohydrate utilization pathways in 19 genomes from the Shewanella genus. The obtained genomic encyclopedia of sugar utilization includes similar to 170 protein families (mostly metabolic enzymes, transporters and transcriptional regulators) spanning 17 distinct pathways with a mosaic distribution across Shewanella species providing insights into their ecophysiology and adaptive evolution. Phenotypic assays revealed a remarkable consistency between predicted and observed phenotype, an ability to utilize an individual sugar as a sole source of carbon and energy, over the entire matrix of tested strains and sugars. Comparison of the reconstructed catabolic pathways with E. coli identified multiple differences that are manifested at various levels, from the presence or absence of certain sugar catabolic pathways, nonorthologous gene replacements and alternative biochemical routes to a different organization of transcription regulatory networks.
Conclusions: The reconstructed sugar catabolome in Shewanella spp includes 62 novel isofunctional families of enzymes, transporters, and regulators. In addition to improving our knowledge of genomics and functional organization of carbohydrate utilization in Shewanella, this study led to a substantial expansion of our current version of the Genomic Encyclopedia of Carbohydrate Utilization. A systematic and iterative application of this approach to multiple taxonomic groups of bacteria will further enhance it, creating a knowledge base adequate for the efficient analysis of any newly sequenced genome as well as of the emerging metagenomic data.
C1 [Rodionov, Dmitry A.; Yang, Chen; Li, Xiaoqing; Rodionova, Irina A.; Osterman, Andrei L.] Burnham Inst Med Res, La Jolla, CA 92037 USA.
[Rodionov, Dmitry A.] Russian Acad Sci, Inst Informat Transmiss Problems, Moscow 127994, Russia.
[Yang, Chen] Chinese Acad Sci, Key Lab Synthet Biol, Inst Plant Physiol & Ecol, Shanghai Inst Biol Sci, Shanghai 200032, Peoples R China.
[Wang, Yanbing; Obraztsova, Anna Y.; Nealson, Kenneth H.] Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA.
[Zagnitko, Olga P.; Overbeek, Ross; Osterman, Andrei L.] Fellowship Interpretat Genomes, Burr Ridge, IL 60527 USA.
[Romine, Margaret F.; Reed, Samantha; Fredrickson, James K.] Pacific NW Natl Lab, Div Biol Sci, Richland, WA 99352 USA.
[Obraztsova, Anna Y.; Nealson, Kenneth H.] J Craig Venter Inst, San Diego, CA 92121 USA.
RP Osterman, AL (reprint author), Burnham Inst Med Res, La Jolla, CA 92037 USA.
EM osterman@burnham.org
OI Rodionov, Dmitry/0000-0002-0939-390X; Romine,
Margaret/0000-0002-0968-7641
FU Department of Energy (DOE) Office of Biological and Environmental
Research; Battelle Memorial Institute [DE-AC05-76RLO 1830]; National
Science Foundation [DBI-0850546]; Russian Foundation for Basic Research
[10-04-01768]; Russian Academy of Sciences; National Science Foundation
of China [30970035]; Chinese Academy of Sciences [KSCX2-YW-G-029];
[MK-422.2009.4]
FX We are grateful to Pavel Novichkov (LBNL) for help with regulon analysis
and presentation in RegPrecise database. 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 and the Microbial Genome Program (MGP). Pacific
Northwest National Laboratory is operated for the DOE by Battelle
Memorial Institute under Contract DE-AC05-76RLO 1830. D. A. R. was
partially supported by National Science Foundation (DBI-0850546),
Russian Foundation for Basic Research (10-04-01768), Russian Academy of
Sciences program 'Molecular and Cellular Biology' and Russian
President's grant for young scientists (MK-422.2009.4). C. Y. was
supported by National Science Foundation of China (30970035) and
One-hundred-Talented-People program of Chinese Academy of Sciences
(KSCX2-YW-G-029).
NR 42
TC 39
Z9 39
U1 2
U2 22
PU BIOMED CENTRAL LTD
PI LONDON
PA 236 GRAYS INN RD, FLOOR 6, LONDON WC1X 8HL, ENGLAND
SN 1471-2164
J9 BMC GENOMICS
JI BMC Genomics
PD SEP 13
PY 2010
VL 11
AR 494
DI 10.1186/1471-2164-11-494
PG 19
WC Biotechnology & Applied Microbiology; Genetics & Heredity
SC Biotechnology & Applied Microbiology; Genetics & Heredity
GA 662EW
UT WOS:000282791100001
PM 20836887
ER
PT J
AU Negres, RA
Norton, MA
Cross, DA
Carr, CW
AF Negres, Raluca A.
Norton, Mary A.
Cross, David A.
Carr, Christopher W.
TI Growth behavior of laser-induced damage on fused silica optics under UV,
ns laser irradiation
SO OPTICS EXPRESS
LA English
DT Article
ID INITIATED DAMAGE; 351 NM; COMPONENTS
AB The growth behavior of laser-induced damage sites is affected by a large number of laser parameters as well as site morphology. Here we investigate the effects of pulse duration on the growth rate of damage sites located on the exit surface of fused silica optics. Results demonstrate a significant dependence of the growth parameters on laser pulse duration at 351 nm from 1 ns to 15 ns, including the observation of a dominant exponential versus linear, multiple-shot growth behavior for long and short pulses, respectively. These salient behaviors are tied to the damage morphology and suggest a shift in the fundamental growth mechanisms for pulses in the 1-5 ns range. (C) 2010 Optical Society of America
C1 [Negres, Raluca A.; Norton, Mary A.; Cross, David A.; Carr, Christopher W.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Negres, RA (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA.
EM negres2@llnl.gov
RI Carr, Chris/F-7163-2013
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344, LLNL-JRNL-439171]
FX We thank W. A. Steele, J. J. Adams, M. Bolourchi and the OSL team for
assistance in the sample preparation and execution 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. LLNL-JRNL-439171
NR 23
TC 44
Z9 45
U1 2
U2 10
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 SEP 13
PY 2010
VL 18
IS 19
BP 19966
EP 19976
DI 10.1364/OE.18.019966
PG 11
WC Optics
SC Optics
GA 649NX
UT WOS:000281779600039
PM 20940888
ER
PT J
AU Intravaia, F
Ellingsen, SA
Henkel, C
AF Intravaia, Francesco
Ellingsen, Simen A.
Henkel, Carsten
TI Casimir-Foucault interaction: Free energy and entropy at low temperature
SO PHYSICAL REVIEW A
LA English
DT Article
ID QUANTUM OSCILLATOR; THERMODYNAMICS; FORCES
AB It was recently found that thermodynamic anomalies which arise in the Casimir effect between metals described by the Drude model can be attributed to the interaction of fluctuating Foucault (or eddy) currents [F. Intravaia and C. Henkel, Phys. Rev. Lett. 103, 130405 (2009).] We focus on the transverse electric (TE) polarization, where the anomalies occur, and show explicitly that the two leading terms of the low-temperature correction to the Casimir free energy of interaction between two plates are identical to those pertaining to the Foucault current interaction alone, up to a correction which is very small for good metals. Moreover, a mode density along real frequencies is introduced, showing that the TE contribution to the Casimir free energy, as given by the Lifshitz theory, separates in a natural manner into contributions from eddy currents and propagating cavity modes, respectively. The latter have long been known to be of little importance to the low-temperature Casimir anomalies. This convincingly demonstrates that eddy current modes are responsible for the large temperature correction to the Casimir effect between Drude metals, predicted by the Lifshitz theory, but not observed in experiments.
C1 [Intravaia, Francesco] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Ellingsen, Simen A.] Norwegian Univ Sci & Technol, Dept Energy & Proc Engn, N-7491 Trondheim, Norway.
[Henkel, Carsten] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany.
RP Intravaia, F (reprint author), Los Alamos Natl Lab, Div Theoret, MS B213, Los Alamos, NM 87545 USA.
RI Henkel, Carsten/C-2540-2011; Ellingsen, Simen/C-5149-2008; Intravaia,
Francesco/E-6500-2010
OI Ellingsen, Simen/0000-0002-0294-0405; Intravaia,
Francesco/0000-0001-7993-4698
FU European Science Foundation (ESF); Humboldt foundation; LANL
FX We have benefited from discussions with Gert-Ludwig Ingold. We also
thank G. L. Klimchitskaya and V. M. Mostepanenko for constructive
comments. Support from the European Science Foundation (ESF) within the
Research Networking Programme "New Trends and Applications of the
Casimir Effect" is gratefully acknowledged. F. I. acknowledges partial
financial support by the Humboldt foundation and LANL.
NR 37
TC 8
Z9 8
U1 0
U2 4
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 SEP 13
PY 2010
VL 82
IS 3
AR 032504
DI 10.1103/PhysRevA.82.032504
PG 9
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 649NS
UT WOS:000281779000005
ER
PT J
AU Shah, AB
Ramasse, QM
May, SJ
Kavich, J
Wen, JG
Zhai, X
Eckstein, JN
Freeland, J
Bhattacharya, A
Zuo, JM
AF Shah, A. B.
Ramasse, Q. M.
May, S. J.
Kavich, Jerald
Wen, J. G.
Zhai, X.
Eckstein, J. N.
Freeland, J.
Bhattacharya, A.
Zuo, J. M.
TI Presence and spatial distribution of interfacial electronic states in
LaMnO3-SrMnO3 superlattices
SO PHYSICAL REVIEW B
LA English
DT Article
ID ENERGY-LOSS SPECTROSCOPY; MICROSCOPE; OXIDES; DIFFRACTION; TRANSITION;
ANGSTROM
AB We report direct evidence of interfacial states at the onset of O K edge confined to a spatial distance of 1 unit-cell full-width at half maximum at the sharp interfaces between epitaxial films of LaMnO3 and SrMnO3 from electron energy-loss spectroscopy (EELS) measurements. The interfacial states are sensitive to interface sharpness; at rough interfaces with interfacial steps of 1-2 unit cells in height, experimental data shows a reduction, or suppression, of the interfacial states. The EELS measurements were performed using a fine electron probe obtained by electron lens aberration correction. By scanning the electron probe across the interface, we are able to map the spatial distribution of the interfacial states across interfaces at high resolution.
C1 [Shah, A. B.; Zuo, J. M.] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
[Shah, A. B.; Wen, J. G.; Zhai, X.; Eckstein, J. N.; Zuo, J. M.] Univ Illinois, Fredrick Seitz Mat Res Lab, Urbana, IL 61801 USA.
[Ramasse, Q. M.] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
[May, S. J.; Kavich, Jerald; Bhattacharya, A.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Zhai, X.; Eckstein, J. N.] Univ Illinois, Dept Phys, Urbana, IL 61801 USA.
[Freeland, J.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[Bhattacharya, A.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
RP Shah, AB (reprint author), Univ Illinois, Dept Mat Sci & Engn, 1304 W Green St, Urbana, IL 61801 USA.
RI May, Steven/D-8563-2011; Bhattacharya, Anand/G-1645-2011
OI May, Steven/0000-0002-8097-1549; Bhattacharya, Anand/0000-0002-6839-6860
FU U.S. Department of Energy [DE-FG02-07ER46453, DE-FG02-07ER46471,
DE-AC02-05CH11231]; National Center for Electron Microscopy; Office of
Basic Energy Sciences, U.S. Department of Energy [DE-AC02-06CH11357]
FX Research in this manuscript was carried out at the Frederick Seitz
Materials Research Laboratory Central Facilities, University of
Illinois, which are partially supported by the U.S. Department of Energy
under Grants No. DE-FG02-07ER46453 and No. DE-FG02-07ER46471, the
National Center for Electron Microscopy, Lawrence Berkeley Laboratory,
which is supported by the U.S. Department of Energy under Grant No.
DE-AC02-05CH11231 and Argonne National Laboratory which is supported by
the Office of Basic Energy Sciences, U.S. Department of Energy under
Grant No. DE-AC02-06CH11357.
NR 40
TC 18
Z9 18
U1 1
U2 35
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 SEP 13
PY 2010
VL 82
IS 11
AR 115112
DI 10.1103/PhysRevB.82.115112
PG 10
WC Physics, Condensed Matter
SC Physics
GA 649MB
UT WOS:000281773700001
ER
PT J
AU Vlasko-Vlasov, V
Welp, U
Kwok, W
Rosenmann, D
Claus, H
Buzdin, AA
Melnikov, A
AF Vlasko-Vlasov, V.
Welp, U.
Kwok, W.
Rosenmann, D.
Claus, H.
Buzdin, A. A.
Melnikov, A.
TI Coupled domain structures in superconductor/ferromagnet Nb-Fe/garnet
bilayers
SO PHYSICAL REVIEW B
LA English
DT Article
ID SUPERCONDUCTIVITY; HETEROSTRUCTURES; FILMS
AB We investigate the magnetic structure in a superconducting Nb and ferromagnetic garnet hybrid film. Direct magneto-optical observations reveal a strong interaction between the superconducting vortices in Nb and the magnetic domains in the garnet, resulting in a unique coupled domain structure. The cooperative motion of vortices and domain walls results in an enhanced pinning and a modified electromagnetic response of the hybrid similar to that in type I superconductors. Application of ac field, routinely used for equilibration of domains, leads to their significant contraction. Our calculations explain this effect by a domain shrinkage instability induced by the vortex annihilation around oscillating domain walls.
C1 [Vlasko-Vlasov, V.; Welp, U.; Kwok, W.; Rosenmann, D.; Claus, H.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Buzdin, A. A.] Inst Univ France, CPMOH, F-33405 Talence, France.
[Buzdin, A. A.] Univ Bordeaux 1, UMR CNRS 5798, F-33405 Talence, France.
[Melnikov, A.] RAS, Inst Phys Microstruct, Nizhnii Novgorod 603950, Russia.
RP Vlasko-Vlasov, V (reprint author), Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA.
RI Buzdin, Alexander/I-6038-2013
FU UChicago Argonne, LLC [DE-AC02-06CH11357]; French ANR [NT09-612693];
Russian Agency of Education
FX The work supported by UChicago Argonne, LLC, under Contract No.
DE-AC02-06CH11357. A. B. acknowledges the support from the French ANR
under Program No. NT09-612693 "SINUS" and A. M. acknowledges the support
of the Russian Agency of Education.
NR 19
TC 11
Z9 11
U1 0
U2 7
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 SEP 13
PY 2010
VL 82
IS 10
AR 100502
DI 10.1103/PhysRevB.82.100502
PG 4
WC Physics, Condensed Matter
SC Physics
GA 649MA
UT WOS:000281773600001
ER
PT J
AU Costantini, H
deBoer, RJ
Azuma, RE
Couder, M
Gorres, J
Hammer, JW
LeBlanc, PJ
Lee, HY
O'Brien, S
Palumbo, A
Simpson, EC
Stech, E
Tan, W
Uberseder, E
Wiescher, M
AF Costantini, H.
deBoer, R. J.
Azuma, R. E.
Couder, M.
Goerres, J.
Hammer, J. W.
LeBlanc, P. J.
Lee, H. Y.
O'Brien, S.
Palumbo, A.
Simpson, E. C.
Stech, E.
Tan, W.
Uberseder, E.
Wiescher, M.
TI O-16(alpha,gamma)Ne-20 S factor: Measurements and R-matrix analysis
SO PHYSICAL REVIEW C
LA English
DT Article
ID THERMONUCLEAR REACTION-RATES; NONRESONANT CAPTURE; ALPHA+O-16 SYSTEM;
ELECTRIC-DIPOLE; ENERGY-LEVELS; NE-20; STRENGTHS; SEARCH; MODEL
AB The article presents new measurements of low-energy resonances in the O-16(alpha,gamma)Ne-20 reaction, which represents the endpoint for the reaction sequence responsible for energy production in stellar helium burning in massive red giant stars. The present data and previous unpublished data are analyzed in the framework of R-matrix theory to derive a reaction rate for the temperature regime of stellar helium burning.
C1 [Costantini, H.] Inst Nazl Fis Nucl, Sez Genova, Genoa, Italy.
[Costantini, H.; deBoer, R. J.; Azuma, R. E.; Couder, M.; Goerres, J.; Hammer, J. W.; LeBlanc, P. J.; O'Brien, S.; Palumbo, A.; Stech, E.; Tan, W.; Uberseder, E.; Wiescher, M.] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA.
[Azuma, R. E.] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada.
[Lee, H. Y.] Los Alamos Natl Lab, LANLSCE NE, Los Alamos, NM 87545 USA.
[Simpson, E. C.] Univ Surrey, Fac Engn & Phys Sci, Dept Phys, Guildford GU2 7XH, Surrey, England.
[Hammer, J. W.] Univ Stuttgart, Inst Strahlenphys, D-7000 Stuttgart, Germany.
RP Costantini, H (reprint author), Inst Nazl Fis Nucl, Sez Genova, Genoa, Italy.
EM rdeboer1@nd.edu
RI Tan, Wanpeng/A-4687-2008; Couder, Manoel/B-1439-2009
OI Tan, Wanpeng/0000-0002-5930-1823; Couder, Manoel/0000-0002-0636-744X
FU National Science Foundation [Phys-0758100]; Joint Institute for Nuclear
Astrophysics [Phys-0822648]; Natural Sciences and Engineering Research
Council of Canada
FX The authors would like to thank Heinrich Knee and Armin Mayer for the
use of the data presented in their thesis works as well as Ralf Kunz for
his considerable aid in the experimental work at the University of
Stuttgart. This work was funded by the National Science Foundation
through Grant No. Phys-0758100, and the Joint Institute for Nuclear
Astrophysics Grant No. Phys-0822648. R. E. A. thanks the Natural
Sciences and Engineering Research Council of Canada for support through
the DRAGON grant at TRIUMF.
NR 34
TC 9
Z9 9
U1 0
U2 7
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 SEP 13
PY 2010
VL 82
IS 3
AR 035802
DI 10.1103/PhysRevC.82.035802
PG 11
WC Physics, Nuclear
SC Physics
GA 649MD
UT WOS:000281774000005
ER
PT J
AU Berger, EL
Cao, QH
Jackson, CB
Liu, T
Shaughnessy, G
AF Berger, Edmond L.
Cao, Qing-Hong
Jackson, C. B.
Liu, Tao
Shaughnessy, Gabe
TI Higgs boson search sensitivity in the H -> WW dilepton decay mode at
root s=7 and 10 TeV
SO PHYSICAL REVIEW D
LA English
DT Article
ID PROTON COLLIDERS; HADRON COLLIDERS; ELECTROWEAK CORRECTIONS; QCD
CORRECTIONS; COLLISIONS; MASS
AB Prospects for discovery of the standard model Higgs boson are examined at center-of-mass energies of 7 and 10 TeV at the CERN Large Hadron Collider. We perform a simulation of the signal and principal backgrounds for Higgs boson production and decay in the W(+)W(-) dilepton mode, finding good agreement with the ATLAS and CMS collaboration estimates of signal significance at 14 TeV for Higgs boson masses near m(H) = 160 GeV. At the lower energy of 7 TeV, using the same analysis cuts as these collaborations, we compute expected signal sensitivities of about 2 standard deviations (sigma's) at m(H) = 160 GeV in the ATLAS case, and about 3:6 sigma in the CMS case for 1 fb(-1) of integrated luminosity. Integrated luminosities of 8 fb(-1) and 3 fb(-1) are needed in the ATLAS case at 7 and 10 TeV, respectively, for 5 sigma level discovery. In the CMS case, the numbers are 2 fb(-1) and 1 fb(-1) at 7 and 10 TeV. Our different stated expectations for the two experiments arise from the more restrictive analysis cuts in the CMS case and from the different event samples in the two cases. Recast as exclusion limits, our results show that with 1 fb(-1) of integrated luminosity at 7 TeV, the LHC may be able to exclude m(H) values in the range 160 to 180 GeV provided no signal is seen.
C1 [Berger, Edmond L.; Cao, Qing-Hong; Jackson, C. B.; Shaughnessy, Gabe] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA.
[Cao, Qing-Hong; Liu, Tao] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA.
[Shaughnessy, Gabe] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA.
RP Berger, EL (reprint author), Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA.
EM berger@anl.gov; caoq@hep.anl.gov; jackson@hep.anl.gov;
xtaoliu@theory.uchicago.edu; g-shaughnessy@northwestern.edu
FU U. S. Department of Energy [DE-AC02-06CH11357, DE-FG02-90ER40560,
DE-FG02-91ER40684, DEFG02-90ER40560]; Argonne National Laboratory;
University of Chicago Joint Theory Institute (JTI) [03921-07-137]
FX The research by E.L.B., Q.-H.C., C.B.J., and G.S. in the High Energy
Physics Division at Argonne is supported the U. S. Department of Energy
under Grant No. DE-AC02-06CH11357. Q.-H.C. is also supported in part by
the Argonne National Laboratory and University of Chicago Joint Theory
Institute (JTI) Grant No. 03921-07-137 and by the U. S. Department of
Energy under Grant No. DE-FG02-90ER40560, and G.S. is also supported in
part by the U. S. Department of Energy under Grant No.
DE-FG02-91ER40684. T.L. is supported in part by the U. S. Department of
Energy under Grant No. DEFG02-90ER40560.
NR 37
TC 7
Z9 7
U1 0
U2 1
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 SEP 13
PY 2010
VL 82
IS 5
AR 053003
DI 10.1103/PhysRevD.82.053003
PG 15
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 649RQ
UT WOS:000281791100001
ER
PT J
AU Linder, EV
AF Linder, Eric V.
TI Uniqueness of current cosmic acceleration
SO PHYSICAL REVIEW D
LA English
DT Article
ID COINCIDENCE PROBLEM; DARK ENERGY
AB One of the strongest arguments against the cosmological constant as an explanation of the current epoch of accelerated cosmic expansion is the existence of an earlier, dynamical acceleration, i.e. inflation. We examine the likelihood that acceleration is an occasional phenomenon, putting stringent limits on the length of any accelerating epoch due to minimally coupled dark energy between recombination and the recent acceleration; such an epoch must last less than 0.05 e-fold (at z > 2) or the matter power spectrum is modified by more than 20%.
C1 [Linder, Eric V.] Berkeley Lab, Berkeley, CA 94720 USA.
[Linder, Eric V.] Univ Calif Berkeley, Berkeley, CA 94720 USA.
[Linder, Eric V.] Ewha Womans Univ, Inst Early Univ, Seoul, South Korea.
RP Linder, EV (reprint author), Berkeley Lab, Berkeley, CA 94720 USA.
FU Office of Science, Office of High Energy Physics, U.S. Department of
Energy [DE-AC02-05CH11231]; World Class University through the National
Research Foundation, Ministry of Education, Science and Technology of
Korea [R32-2009-000-10130-0]
FX I thank Stephen Appleby, Marina Cortes, Roland de Putter, Manoj
Kaplinghat, and especially Tristan Smith for useful discussions. This
work has been supported in part by the Director, Office of Science,
Office of High Energy Physics, of the U.S. Department of Energy under
Contract No. DE-AC02-05CH11231, and the World Class University Grant No.
R32-2009-000-10130-0 through the National Research Foundation, Ministry
of Education, Science and Technology of Korea.
NR 19
TC 15
Z9 15
U1 0
U2 0
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 SEP 13
PY 2010
VL 82
IS 6
AR 063514
DI 10.1103/PhysRevD.82.063514
PG 6
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 649RS
UT WOS:000281791300002
ER
PT J
AU Guo, H
Chien, CC
Levin, K
AF Guo, Hao
Chien, Chih-Chun
Levin, K.
TI Establishing the Presence of Coherence in Atomic Fermi Superfluids:
Spin-Flip and Spin-Preserving Bragg Scattering at Finite Temperatures
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID GAS
AB We show how in ultracold Fermi gases the difference between the finite temperature T structure factors, called S(-)(omega, q), associated with spin and density, reflects coherent order at all omega, q, k(F)a, and T. This observation can be exploited in two photon Bragg scattering experiments on gases which are subject to variable attractive interactions. Our calculations incorporate spin and particle number conservation laws which lead to compatibility at general T with two f-sum rules. Because of its generality a measurement of S(-) (omega, q) can be a qualitative, direct, in situ approach for establishing superfluid order.
C1 [Guo, Hao; Levin, K.] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA.
[Guo, Hao; Levin, K.] Univ Chicago, Dept Phys, Chicago, IL 60637 USA.
[Chien, Chih-Chun] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
RP Guo, H (reprint author), Univ Chicago, James Franck Inst, 5640 S Ellis Ave, Chicago, IL 60637 USA.
FU NSF-MRSEC [DMR-0213745]; U.S. Department of Energy
FX This work was supported by Grant No. NSF-MRSEC DMR-0213745. C. C. C.
acknowledges the support of the U.S. Department of Energy through the
LANL/LDRD Program.
NR 15
TC 27
Z9 27
U1 0
U2 1
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 SEP 13
PY 2010
VL 105
IS 12
AR 120401
DI 10.1103/PhysRevLett.105.120401
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 649SB
UT WOS:000281792400001
PM 20867615
ER
PT J
AU Ramos, SM
Fontes, MB
Hering, EN
Continentino, MA
Baggio-Saitovich, E
Neto, FD
Bittar, EM
Pagliuso, PG
Bauer, ED
Sarrao, JL
Thompson, JD
AF Ramos, S. M.
Fontes, M. B.
Hering, E. N.
Continentino, M. A.
Baggio-Saitovich, E.
Dinola Neto, F.
Bittar, E. M.
Pagliuso, P. G.
Bauer, E. D.
Sarrao, J. L.
Thompson, J. D.
TI Superconducting Quantum Critical Point in CeCoIn5-xSnx
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID UNCONVENTIONAL SUPERCONDUCTIVITY; MAGNETISM; PRESSURE; CERHIN5
AB We report a combined pressure-doping study in the nearly two-dimensional heavy fermion superconductor CeCoIn5 as its superconducting phase is driven to the normal state by Sn doping and/or applied pressure. Temperature-pressure-dependent electrical resistivity measurements were performed at the vicinity of a superconducting quantum critical point where T-c -> 0. A universal plot of the concentration- and pressure-dependent phase diagram suggests that for the concentrations studied a single mechanism is responsible for reducing T-c and bringing the system to the superconducting quantum critical point. A two-band model with hybridization controlled by pressure and doping provides a consistent description of the phase diagram and the suppression of the d-wave superconductivity in this material.
C1 [Ramos, S. M.; Fontes, M. B.; Hering, E. N.; Continentino, M. A.; Baggio-Saitovich, E.] Ctr Brasileiro Pesquisas Fis, BR-22290180 Rio De Janeiro, Brazil.
[Dinola Neto, F.] Univ Fed Fluminense, Inst Fis, BR-24210340 Niteroi, RJ, Brazil.
[Bittar, E. M.; Pagliuso, P. G.] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP, Brazil.
[Bauer, E. D.; Sarrao, J. L.; Thompson, J. D.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Ramos, SM (reprint author), Ctr Brasileiro Pesquisas Fis, Rua Dr Xavier Sigaud 150, BR-22290180 Rio De Janeiro, Brazil.
EM smr@if.uff.br
RI Bauer, Eric/D-7212-2011; Pagliuso, Pascoal/C-9169-2012; Continentino,
Mucio/B-7271-2013; Bittar, Eduardo/B-6266-2008; Inst. of Physics, Gleb
Wataghin/A-9780-2017;
OI Continentino, Mucio/0000-0003-0167-8529; Bittar,
Eduardo/0000-0002-2762-1312; Bauer, Eric/0000-0003-0017-1937
FU FAPERJ; FAPEAM; FAPESP; CNPq (Brazil); U.S. DOE
FX The authors thank FAPERJ, FAPEAM, FAPESP, CNPq (Brazil), and U.S. DOE
for funding this work.
NR 26
TC 19
Z9 19
U1 1
U2 21
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 SEP 13
PY 2010
VL 105
IS 12
AR 126401
DI 10.1103/PhysRevLett.105.126401
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 649SB
UT WOS:000281792400012
PM 20867661
ER
PT J
AU Kessedjian, G
Jurado, B
Aiche, M
Barreau, G
Bidaud, A
Czajkowski, S
Dassie, D
Haas, B
Mathieu, L
Audouin, L
Capellan, N
Tassan-Got, L
Wilson, JN
Berthoumieux, E
Gunsing, F
Theisen, C
Serot, O
Bauge, E
Ahmad, I
Greene, JP
Janssens, RVF
AF Kessedjian, G.
Jurado, B.
Aiche, M.
Barreau, G.
Bidaud, A.
Czajkowski, S.
Dassie, D.
Haas, B.
Mathieu, L.
Audouin, L.
Capellan, N.
Tassan-Got, L.
Wilson, J. N.
Berthoumieux, E.
Gunsing, F.
Theisen, Ch
Serot, O.
Bauge, E.
Ahmad, I.
Greene, J. P.
Janssens, R. V. F.
TI Neutron-induced fission cross sections of short-lived actinides with the
surrogate reaction method
SO PHYSICS LETTERS B
LA English
DT Article
DE Surrogate reaction method; neutron-induced fission cross sections
ID TRANSFER-REACTION TH-232(HE-3; PA-233(N; P)PA-234
AB Neutron-induced fission cross sections for (242,243)cm and Am-241 have been obtained with the surrogate reaction method. Recent results for the neutron-induced cross section of Cm-243 are questioned by the present data. For the first time, the (CM)-C-242 cross section has been determined up to the onset of second-chance fission. The good agreement at the lowest excitation energies between the present results and the existing neutron-induced data indicates that the distributions in spin and parity of states populated with both techniques are similar. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Kessedjian, G.; Jurado, B.; Aiche, M.; Barreau, G.; Bidaud, A.; Czajkowski, S.; Dassie, D.; Haas, B.; Mathieu, L.] Univ Bordeaux 1, CENBG, CNRS, IN2P3, F-33175 Gradignan, France.
[Audouin, L.; Capellan, N.; Tassan-Got, L.; Wilson, J. N.] Univ Paris 11, IPN, CNRS, IN2P3, F-91405 Orsay, France.
[Berthoumieux, E.; Gunsing, F.; Theisen, Ch] CEA Saclay, DSM, IRFU, SPhN, F-91191 Gif Sur Yvette, France.
[Serot, O.] CEN Cadarache, DEN, DER, SPRC,LEPh, F-13108 St Paul Les Durance, France.
[Bauge, E.] CEA DAM DIF, F-91297 Arpajon, France.
[Ahmad, I.; Greene, J. P.; Janssens, R. V. F.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
RP Jurado, B (reprint author), Univ Bordeaux 1, CENBG, CNRS, IN2P3, Chemin Solarium BP 120, F-33175 Gradignan, France.
EM jurado@cenbg.in2p3.fr
RI THEISEN, Christophe/A-9343-2015
OI THEISEN, Christophe/0000-0002-8509-1022
FU CNRS; Conseil Regional d'Aquitaine; US Department of Energy, Office of
Nuclear Physics [DE-AC02-06CH11357]
FX We thank the tandem accelerator staff and the target laboratory of the
IPN Orsay for their support during the experiment. This work was partly
supported by the CNRS program PACEN/GEDEPEON, the Conseil Regional
d'Aquitaine, the US Department of Energy, Office of Nuclear Physics,
under contract DE-AC02-06CH11357. The authors are also indebted for the
use of 243Am to the Office of Basic Energy Sciences, US
Department of Energy, through the transplutonium element production
facilities at Oak Ridge National Laboratory.
NR 20
TC 39
Z9 39
U1 0
U2 6
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 SEP 13
PY 2010
VL 692
IS 5
BP 297
EP 301
DI 10.1016/j.physletb.2010.07.048
PG 5
WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 657YH
UT WOS:000282454800002
ER
PT J
AU Alves, DSM
Behbahani, SR
Schuster, P
Wacker, JG
AF Alves, Daniele S. M.
Behbahani, Siavosh R.
Schuster, Philip
Wacker, Jay G.
TI Composite inelastic dark matter
SO PHYSICS LETTERS B
LA English
DT Article
DE Inelastic dark matter; DAMA; Dark sector
ID NUCLEAR RECOIL; DAMA/NAI; LIMITS
AB Peaking consistently in June for nearly eleven years, the annual modulation signal reported by DAMA/Nal and DAMA/LIBRA offers strong evidence for the identity of dark matter. DAMA's signal strongly suggest that dark matter inelastically scatters into an excited state split by O(100 key). We propose that DAMA is observing hyperfine transitions of a composite dark matter particle. As an example, we consider a meson of a QCD-like sector, built out of constituent fermions whose spin-spin interactions break the degeneracy of the ground state. An axially coupled U(1) gauge boson that mixes kinetically with hypercharge induces inelastic hyperfine transitions of the meson dark matter that can explain the DAMA signal. Published by Elsevier B.V.
C1 [Alves, Daniele S. M.; Behbahani, Siavosh R.] Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
[Alves, Daniele S. M.; Behbahani, Siavosh R.; Schuster, Philip; Wacker, Jay G.] Stanford Univ, SLAC, Menlo Pk, CA 94025 USA.
RP Alves, DSM (reprint author), Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
EM alves@stanford.edu
FU US DOE [DE-AC02-76SF00515]; NSF [PHY-0244728]
FX We thank Rouven Essig and Natalia Toro for numerous illuminating
discussions, and Mariangela Lisanti for collaboration in setting
constraints. We also thank Savas Dimopoulos, Michael Peskin, and Neal
Weiner for helpful feedback. S.R.B.. P.C.S. and J.G.W. are supported by
the US DOE under contract number DE-AC02-76SF00515. D.S.M.A. is
supported by the NSF under grant PHY-0244728.
NR 36
TC 64
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U1 0
U2 2
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 SEP 13
PY 2010
VL 692
IS 5
BP 323
EP 326
DI 10.1016/j.physletb.2010.08.006
PG 4
WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 657YH
UT WOS:000282454800007
ER
PT J
AU Zaveri, RA
Barnard, JC
Easter, RC
Riemer, N
West, M
AF Zaveri, Rahul A.
Barnard, James C.
Easter, Richard C.
Riemer, Nicole
West, Matthew
TI Particle-resolved simulation of aerosol size, composition, mixing state,
and the associated optical and cloud condensation nuclei activation
properties in an evolving urban plume
SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
LA English
DT Article
ID SECONDARY ORGANIC AEROSOL; MASS-SPECTROMETER; BLACK CARBON; ATMOSPHERIC
AEROSOLS; CHEMICAL-COMPOSITION; ALPHA-PINENE; MODEL; ABSORPTION;
DENSITY; COAGULATION
AB The recently developed particle-resolved aerosol box model PartMC-MOSAIC (Particle Monte Carlo model-Model for Simulating Aerosol Interactions and Chemistry) was used to rigorously simulate the evolution of aerosol mixing state and the associated optical and cloud condensation nuclei (CCN) activation properties in an idealized urban plume. The model explicitly resolved the size and composition of individual particles from a number of sources and tracked their evolution due to condensation, evaporation, coagulation, emission, and dilution. The ensemble black carbon (BC)-specific absorption cross section increased by 40% over the course of 2 days due to BC aging by condensation and coagulation. Threefold and fourfold enhancements in CCN/CN ratios were predicted to occur within 6 h for 0.2% and 0.5% supersaturations (S), respectively. The particle-resolved results were used to evaluate the errors in the optical and CCN activation properties that would be predicted by a conventional sectional framework that assumes monodisperse, internally mixed particles within each bin. This assumption artificially increased the ensemble BC-specific absorption by 14-30% and decreased the single scattering albedo (SSA) by 0.03-0.07, while the bin resolution had a negligible effect. In contrast, the errors in CCN/CN ratios were sensitive to the bin resolution for a chosen supersaturation. For S = 0.2%, the CCN/CN ratio predicted using 100 internally mixed bins was up to 25% higher than the particle-resolved results, while it was up to 125% higher using 10 internally mixed bins. Neglecting coagulation overpredicted aerosol water content and number concentrations (<0.2 mu m), causing errors in SSA from -0.02 to 0.035 and overprediction of CCN concentrations by 25-80% at S = 0.5%.
C1 [Zaveri, Rahul A.; Barnard, James C.; Easter, Richard C.] Pacific NW Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA.
[Riemer, Nicole] Univ Illinois, Dept Atmospher Sci, Urbana, IL 61801 USA.
[West, Matthew] Univ Illinois, Dept Mech Sci & Engn, Urbana, IL 61801 USA.
RP Zaveri, RA (reprint author), Pacific NW Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA.
EM rahul.zaveri@pnl.gov
RI West, Matthew/A-7398-2012;
OI West, Matthew/0000-0002-7605-0050; Zaveri, Rahul/0000-0001-9874-8807
FU Aerosol-Climate Initiative as part of the Pacific Northwest National
Laboratory (PNNL); National Science Foundation (NSF) [ATM 0739404, CMG
0934491]; NASA [NNX09AK66G]; U.S. Department of Energy [DE-AC06-76RLO
1830]
FX Funding for R. A. Zaveri, J. C. Barnard, and R. C. Easter was provided
by the Aerosol-Climate Initiative as part of the Pacific Northwest
National Laboratory (PNNL) Laboratory Directed Research and Development
(LDRD) program. Funding for N. Riemer and M. West was provided by the
National Science Foundation (NSF) under grant ATM 0739404 and CMG
0934491. N. Riemer also acknowledges funding from the NASA MAP program,
grant NNX09AK66G. Pacific Northwest National Laboratory is operated for
the U.S. Department of Energy by Battelle Memorial Institute under
contract DE-AC06-76RLO 1830.
NR 66
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U2 40
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-897X
EI 2169-8996
J9 J GEOPHYS RES-ATMOS
JI J. Geophys. Res.-Atmos.
PD SEP 11
PY 2010
VL 115
AR D17210
DI 10.1029/2009JD013616
PG 19
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 649GJ
UT WOS:000281755900001
ER
PT J
AU Belczynski, K
Lorimer, DR
Ridley, JP
Curran, SJ
AF Belczynski, K.
Lorimer, D. R.
Ridley, J. P.
Curran, S. J.
TI Double and single recycled pulsars: an evolutionary puzzle?
SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
LA English
DT Article
DE methods: statistical; stars: kinematics and dynamics; stars: neutron;
pulsars: general
ID NEUTRON-STAR BINARIES; ELECTRON-CAPTURE SUPERNOVAE; DATA-ANALYSIS
SYSTEMS; X-RAY BINARIES; CORE-COLLAPSE; RADIO PULSARS; GALACTIC
POPULATION; MILLISECOND PULSARS; COMPACT OBJECTS; SPIN EVOLUTION
AB We investigate the statistics of isolated recycled pulsars and double neutron star binaries in the Galactic disc. Since recycled pulsars are believed to form through accretion and spin-up in close binaries, the isolated objects presumably originate from disrupted progenitors of double neutron stars. There are a comparable number of double neutron star systems compared to isolated recycled pulsars. We find that standard evolutionary models cannot explain this fact, predicting several times the number of isolated recycled pulsars than those in double neutron star systems. We demonstrate, through population synthesis calculations, that the velocity distribution of isolated recycled pulsars is broader than for binary systems. When this is accounted for in a model for radio pulsar survey selection effects, which include the effects of Doppler smearing for the double neutron star binaries, we find that there is a small (similar to 25 per cent) bias towards the detection of double neutron star systems. This bias, however, is not significant enough to explain the observational discrepancy if standard (Sigma = 265 km s-1) neutron star natal kick velocities are invoked in binary population syntheses. Population syntheses in which the 1D Maxwellian velocity dispersion of the natal kick is Sigma similar to 170 km s-1 are consistent with the observations. These conclusions further support earlier findings the neutron stars formed in close interacting binaries receive significantly smaller natal kicks than the velocities of Galactic single pulsars would seem to indicate.
C1 [Belczynski, K.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Belczynski, K.] Univ Warsaw, Astron Observ, PL-00478 Warsaw, Poland.
[Lorimer, D. R.; Ridley, J. P.] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA.
[Lorimer, D. R.] Green Bank Observ, Green Bank, WV 24944 USA.
[Curran, S. J.] Univ New S Wales, Sch Phys, Sydney, NSW 2052, Australia.
RP Belczynski, K (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM kbelczyn@nmsu.edu
FU WVU Center for Astrophysics; Polish MSHE [N N203 302835, N N203 511238];
LANL [DE-AC52-06NA25396]
FX We would like to thank T. Bulik, W. Kluzniak and P. Haensel for useful
discussions on pulsar populations. This research was partially supported
by a WVEPSCoR Research Challenge Grant held by the WVU Center for
Astrophysics. KB acknowledges the partial support from the Polish MSHE
grants N N203 302835 and N N203 511238 and by LANL under contract No.
DE-AC52-06NA25396. The pulsar parameters used in Table 1 were obtained
from the ATNF Pulsar Catalogue (Manchester et al. 2005).
NR 81
TC 21
Z9 21
U1 0
U2 0
PU OXFORD UNIV PRESS
PI OXFORD
PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
SN 0035-8711
EI 1365-2966
J9 MON NOT R ASTRON SOC
JI Mon. Not. Roy. Astron. Soc.
PD SEP 11
PY 2010
VL 407
IS 2
BP 1245
EP 1254
DI 10.1111/j.1365-2966.2010.16970.x
PG 10
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 646OG
UT WOS:000281551300042
ER
PT J
AU Gould, A
Dong, S
Gaudi, BS
Udalski, A
Bond, IA
Greenhill, J
Street, RA
Dominik, M
Sumi, T
Szymanski, MK
Han, C
Allen, W
Bolt, G
Bos, M
Christie, GW
Depoy, DL
Drummond, J
Eastman, JD
Gal-Yam, A
Higgins, D
Janczak, J
Kaspi, S
Kozlowski, S
Lee, CU
Mallia, F
Maury, A
Maoz, D
McCormick, J
Monard, LAG
Moorhouse, D
Morgan, N
Natusch, T
Ofek, EO
Park, BG
Pogge, RW
Polishook, D
Santallo, R
Shporer, A
Spector, O
Thornley, G
Yee, JC
Kubiak, M
Pietrzynski, G
Soszynski, I
Szewczyk, O
Wyrzykowski, E
Ulaczyk, K
Poleski, R
Abe, F
Bennett, DP
Botzler, CS
Douchin, D
Freeman, M
Fukui, A
Furusawa, K
Hearnshaw, JB
Hosaka, S
Itow, Y
Kamiya, K
Kilmartin, PM
Korpela, A
Lin, W
Ling, CH
Makita, S
Masuda, K
Matsubara, Y
Miyake, N
Muraki, Y
Nagaya, M
Nishimoto, K
Ohnishi, K
Okumura, T
Perrott, YC
Philpott, L
Rattenbury, N
Saito, T
Sako, T
Sullivan, DJ
Sweatman, WL
Tristram, PJ
von Seggern, E
Yock, PCM
Albrow, M
Batista, V
Beaulieu, JP
Brillant, S
Caldwell, J
Calitz, JJ
Cassan, A
Cole, A
Cook, K
Coutures, C
Dieters, S
Prester, DD
Donatowicz, J
Fouque, P
Hill, K
Hoffman, M
Jablonski, F
Kane, SR
Kains, N
Kubas, D
Marquette, JB
Martin, R
Martioli, E
Meintjes, P
Menzies, J
Pedretti, E
Pollard, K
Sahu, KC
Vinter, C
Wambsganss, J
Watson, R
Williams, A
Zub, M
Allan, A
Bode, MF
Bramich, DM
Burgdorf, MJ
Clay, N
Fraser, S
Hawkins, E
Horne, K
Kerins, E
Lister, TA
Mottram, C
Saunders, ES
Snodgrass, C
Steele, IA
Tsapras, Y
Jorgensen, UG
Anguita, T
Bozza, V
Novati, SC
Harpsoe, K
Hinse, TC
Hundertmark, M
Kjaergaard, P
Liebig, C
Mancini, L
Masi, G
Mathiasen, M
Rahvar, S
Ricci, D
Scarpetta, G
Southworth, J
Surdej, J
Thone, CC
AF Gould, A.
Dong, Subo
Gaudi, B. S.
Udalski, A.
Bond, I. A.
Greenhill, J.
Street, R. A.
Dominik, M.
Sumi, T.
Szymanski, M. K.
Han, C.
Allen, W.
Bolt, G.
Bos, M.
Christie, G. W.
DePoy, D. L.
Drummond, J.
Eastman, J. D.
Gal-Yam, A.
Higgins, D.
Janczak, J.
Kaspi, S.
Kozlowski, S.
Lee, C. -U.
Mallia, F.
Maury, A.
Maoz, D.
McCormick, J.
Monard, L. A. G.
Moorhouse, D.
Morgan, N.
Natusch, T.
Ofek, E. O.
Park, B. -G.
Pogge, R. W.
Polishook, D.
Santallo, R.
Shporer, A.
Spector, O.
Thornley, G.
Yee, J. C.
Kubiak, M.
Pietrzynski, G.
Soszynski, I.
Szewczyk, O.
Wyrzykowski, E.
Ulaczyk, K.
Poleski, R.
Abe, F.
Bennett, D. P.
Botzler, C. S.
Douchin, D.
Freeman, M.
Fukui, A.
Furusawa, K.
Hearnshaw, J. B.
Hosaka, S.
Itow, Y.
Kamiya, K.
Kilmartin, P. M.
Korpela, A.
Lin, W.
Ling, C. H.
Makita, S.
Masuda, K.
Matsubara, Y.
Miyake, N.
Muraki, Y.
Nagaya, M.
Nishimoto, K.
Ohnishi, K.
Okumura, T.
Perrott, Y. C.
Philpott, L.
Rattenbury, N.
Saito, To.
Sako, T.
Sullivan, D. J.
Sweatman, W. L.
Tristram, P. J.
von Seggern, E.
Yock, P. C. M.
Albrow, M.
Batista, V.
Beaulieu, J. P.
Brillant, S.
Caldwell, J.
Calitz, J. J.
Cassan, A.
Cole, A.
Cook, K.
Coutures, C.
Dieters, S.
Prester, D. Dominis
Donatowicz, J.
Fouque, P.
Hill, K.
Hoffman, M.
Jablonski, F.
Kane, S. R.
Kains, N.
Kubas, D.
Marquette, J. -B.
Martin, R.
Martioli, E.
Meintjes, P.
Menzies, J.
Pedretti, E.
Pollard, K.
Sahu, K. C.
Vinter, C.
Wambsganss, J.
Watson, R.
Williams, A.
Zub, M.
Allan, A.
Bode, M. F.
Bramich, D. M.
Burgdorf, M. J.
Clay, N.
Fraser, S.
Hawkins, E.
Horne, K.
Kerins, E.
Lister, T. A.
Mottram, C.
Saunders, E. S.
Snodgrass, C.
Steele, I. A.
Tsapras, Y.
Jorgensen, U. G.
Anguita, T.
Bozza, V.
Novati, S. Calchi
Harpsoe, K.
Hinse, T. C.
Hundertmark, M.
Kjaergaard, P.
Liebig, C.
Mancini, L.
Masi, G.
Mathiasen, M.
Rahvar, S.
Ricci, D.
Scarpetta, G.
Southworth, J.
Surdej, J.
Thone, C. C.
CA FUN Collaboration
OGLE Collaboration
MOA Collaboration
PLANET Collaboration
RoboNet Collaboration
MiNDSTEp Consortium
TI FREQUENCY OF SOLAR-LIKE SYSTEMS AND OF ICE AND GAS GIANTS BEYOND THE
SNOW LINE FROM HIGH-MAGNIFICATION MICROLENSING EVENTS IN 2005-2008
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE gravitational lensing: micro; planetary systems
ID GRAVITATIONAL LENSING EXPERIMENT; EXTRASOLAR PLANETS; GALACTIC BULGE;
MASS PLANET; EARTH-MASS; JUPITER/SATURN ANALOG; COMPANIONS; SEARCH;
CONSTRAINTS; STELLAR
AB We present the first measurement of the planet frequency beyond the "snow line," for the planet-to-star mass-ratio interval -4.5 < log q < -2, corresponding to the range of ice giants to gas giants. We find
d(2)N(pl)/d log q d log s = (0.36 +/- 0.15) dex(-2)
at the mean mass ratio q = 5 x 10(-4) with no discernible deviation from a flat (Opik's law) distribution in log-projected separation s. The determination is based on a sample of six planets detected from intensive follow-up observations of high-magnification (A > 200) microlensing events during 2005-2008. The sampled host stars have a typical mass M(host) similar to 0.5M(circle dot), and detection is sensitive to planets over a range of planet-star-projected separations (s(max)(-1)R(E), s(max)R(E)), where R(E) similar to 3.5 AU(M(host)/M(circle dot))(1/2) is the Einstein radius and s(max) similar to (q/10(-4.3))(1/3). This corresponds to deprojected separations roughly three times the " snow line." We show that the observations of these events have the properties of a "controlled experiment," which is what permits measurement of absolute planet frequency. High-magnification events are rare, but the survey-plus-follow-up high-magnification channel is very efficient: half of all high-mag events were successfully monitored and half of these yielded planet detections. The extremely high sensitivity of high-mag events leads to a policy of monitoring them as intensively as possible, independent of whether they show evidence of planets. This is what allows us to construct an unbiased sample. The planet frequency derived from microlensing is a factor 8 larger than the one derived from Doppler studies at factor similar to 25 smaller star-planet separations (i.e., periods 2-2000 days). However, this difference is basically consistent with the gradient derived from Doppler studies (when extrapolated well beyond the separations from which it is measured). This suggests a universal separation distribution across 2 dex in planet-star separation, 2 dex in mass ratio, and 0.3 dex in host mass. Finally, if all planetary systems were "analogs" of the solar system, our sample would have yielded 18.2 planets (11.4 "Jupiters," 6.4 "Saturns," 0.3 "Uranuses," 0.2 "Neptunes") including 6.1 systems with two or more planet detections. This compares to six planets including one twoplanet system in the actual sample, implying a first estimate of 1/6 for the frequency of solar-like systems.
C1 [Gould, A.; Gaudi, B. S.; Eastman, J. D.; Janczak, J.; Kozlowski, S.; Morgan, N.; Pogge, R. W.; Yee, J. C.] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA.
[Dong, Subo] Inst Adv Study, Princeton, NJ 08540 USA.
[Udalski, A.; Szymanski, M. K.; Kubiak, M.; Pietrzynski, G.; Soszynski, I.; Ulaczyk, K.; Poleski, R.] Univ Warsaw Observ, PL-00478 Warsaw, Poland.
[Bond, I. A.; Lin, W.; Ling, C. H.; Sweatman, W. L.] Massey Univ, Inst Informat & Math Sci, N Shore Mail Ctr, Auckland, New Zealand.
[Greenhill, J.; Cole, A.; Hill, K.; Watson, R.] Univ Tasmania, Sch Math & Phys, Hobart, Tas 7001, Australia.
[Street, R. A.; Hawkins, E.; Lister, T. A.; Saunders, E. S.; Tsapras, Y.] Cumbres Observ Global Telescope Network, Goleta, CA 93117 USA.
[Street, R. A.] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA.
[Dominik, M.; Kains, N.; Pedretti, E.; Horne, K.; Liebig, C.] Univ St Andrews, SUPA Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland.
[Sumi, T.; Abe, F.; Fukui, A.; Furusawa, K.; Hosaka, S.; Itow, Y.; Kamiya, K.; Makita, S.; Masuda, K.; Matsubara, Y.; Miyake, N.; Nagaya, M.; Nishimoto, K.; Okumura, T.; Sako, T.] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi 4648601, Japan.
[Han, C.] Chungbuk Natl Univ, Inst Basic Sci Res, Dept Phys, Chonju 361763, South Korea.
[Allen, W.] Vintage Lane Observ, Blenheim, New Zealand.
[Bolt, G.] Craigie Observ, Perth, WA, Australia.
[Bos, M.] Molehill Astron Observ, Auckland, New Zealand.
[Christie, G. W.] Auckland Observ, Auckland, New Zealand.
[DePoy, D. L.] Texas A&M Univ, Dept Phys & Astron, College Stn, TX USA.
[Drummond, J.] Possum Observ, Patutahi, New Zealand.
[Gal-Yam, A.] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-76100 Rehovot, Israel.
[Higgins, D.] Hunters Hill Observ, Canberra, ACT, Australia.
[Kaspi, S.; Maoz, D.; Polishook, D.; Shporer, A.; Spector, O.] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel.
[Kaspi, S.; Maoz, D.; Polishook, D.; Shporer, A.; Spector, O.] Tel Aviv Univ, Wise Observ, IL-69978 Tel Aviv, Israel.
[Kaspi, S.] Dept Phys, IL-32000 Haifa, Israel.
[Lee, C. -U.; Park, B. -G.] Korea Astron & Space Sci Inst, Taejon 305348, South Korea.
[Mallia, F.; Maury, A.] Campo Catino Austral Observ, San Pedro, Chile.
[McCormick, J.] Ctr Backyard Astrophys, Farm Cove Observ, Auckland, New Zealand.
[Monard, L. A. G.] Ctr Backyard Astrophys, Bronberg Observ, Pretoria, South Africa.
[Moorhouse, D.; Thornley, G.] Kumeu Observ, Kumeu, New Zealand.
[Natusch, T.] AUT Univ, Auckland, New Zealand.
[Santallo, R.] So Stars Observ, Tahiti, Fr Polynesia.
[Pietrzynski, G.; Szewczyk, O.] Univ Concepcion, Dept Fis, Concepcion, Chile.
[Wyrzykowski, E.] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.
[Bennett, D. P.] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA.
[Botzler, C. S.; Douchin, D.; Freeman, M.; Perrott, Y. C.; Philpott, L.; Rattenbury, N.; von Seggern, E.; Yock, P. C. M.] Univ Auckland, Dept Phys, Auckland, New Zealand.
[Hearnshaw, J. B.; Albrow, M.; Pollard, K.] Univ Canterbury, Dept Phys & Astron, Christchurch 8020, New Zealand.
[Kilmartin, P. M.; Tristram, P. J.] Mt John Observ, Lake Tekapo 8780, New Zealand.
[Korpela, A.; Sullivan, D. J.] Victoria Univ, Sch Chem & Phys Sci, Wellington, New Zealand.
[Muraki, Y.] Konan Univ, Dept Phys, Kobe, Hyogo 6588501, Japan.
[Ohnishi, K.] Nagano Natl Coll Technol, Nagano 3818550, Japan.
[Saito, To.] Tokyo Metropolitan Coll Ind Technol, Tokyo 1168523, Japan.
[Batista, V.; Beaulieu, J. P.; Cassan, A.; Dieters, S.; Marquette, J. -B.] Univ Paris 06, CNRS, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France.
[Brillant, S.; Kubas, D.; Snodgrass, C.] European So Observ, Santiago 19, Chile.
[Caldwell, J.] McDonald Observ, Ft Davis, TX 79734 USA.
[Calitz, J. J.; Hoffman, M.; Meintjes, P.] Univ Orange Free State, Dept Phys, Fac Nat & Agr Sci, ZA-9300 Bloemfontein, South Africa.
[Cook, K.] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94551 USA.
[Coutures, C.] CEA Saclay, F-91191 Gif Sur Yvette, France.
[Prester, D. Dominis] Univ Rijeka, Dept Phys, Omladinska 51000, Rijeka, Croatia.
[Donatowicz, J.] Vienna Univ Technol, A-1040 Vienna, Austria.
[Fouque, P.] Univ Toulouse, CNRS, LATT, Toulouse, France.
[Jablonski, F.; Martioli, E.] Inst Nacl Pesquisas Espaciais, Sao Jose Dos Campos, SP, Brazil.
[Kane, S. R.] CALTECH, NASA Exoplanet Sci Inst, Pasadena, CA 91125 USA.
[Martin, R.; Williams, A.] Perth Observ, Perth, WA 6076, Australia.
[Menzies, J.] S African Astron Observ, ZA-7935 Cape Town, South Africa.
[Sahu, K. C.] Space Telescope Sci Inst, Baltimore, MD 21218 USA.
[Vinter, C.; Jorgensen, U. G.; Harpsoe, K.; Hinse, T. C.; Kjaergaard, P.; Mathiasen, M.; Thone, C. C.] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen O, Denmark.
[Wambsganss, J.; Zub, M.; Anguita, T.; Liebig, C.] Univ Heidelberg, Zent Astron, Astronom Rechen Inst, D-69120 Heidelberg, Germany.
[Zub, M.] Univ Zielona Gora, Inst Astron, PL-66265 Zielona Gora, Poland.
[Allan, A.; Saunders, E. S.] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England.
[Bode, M. F.; Clay, N.; Fraser, S.; Mottram, C.; Steele, I. A.] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool CH41 1LD, Merseyside, England.
[Bramich, D. M.] European So Observ, D-85748 Garching, Germany.
[Burgdorf, M. J.] Univ Stuttgart, Deutsch SOFIA Inst, D-70569 Stuttgart, Germany.
[Burgdorf, M. J.] NASA, Ames Res Ctr, SOFIA Sci Ctr, Moffett Field, CA 94035 USA.
[Kerins, E.] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England.
[Snodgrass, C.] Max Planck Inst Solar Syst Res, D-37191 Katlenburg Lindau, Germany.
[Tsapras, Y.] Univ London, Sch Math Sci, Astron Unit, London E1 4NS, England.
[Jorgensen, U. G.] Univ Copenhagen, Ctr Star & Planet Format, DK-1350 Copenhagen, Denmark.
[Anguita, T.] Pontificia Univ Catolica Chile, Dept Astron & Astrofis, Santiago, Chile.
[Bozza, V.; Novati, S. Calchi; Mancini, L.; Scarpetta, G.] Univ Salerno, Dipartimento Fis E R Caianiello, I-84085 Fisciano, SA, Italy.
[Bozza, V.; Novati, S. Calchi; Mancini, L.; Scarpetta, G.] Ist Nazl Fis Nucl, Gruppo Collegato Salerno, Sez Napoli, Milan, Italy.
[Bozza, V.; Novati, S. Calchi; Mancini, L.; Scarpetta, G.] IIASS, I-84019 Vietri Sul Mare, SA, Italy.
[Hinse, T. C.] Armagh Observ, Armagh BT61 9DG, North Ireland.
[Hundertmark, M.] Univ Gottingen, Inst Astrophys, D-37077 Gottingen, Germany.
[Mancini, L.] Univ Sannio, Dipartimento Ingn, I-82100 Benevento, Italy.
[Masi, G.] Bellatrix Astron Observ, I-03023 Ceccano, FR, Italy.
[Rahvar, S.] Sharif Univ Technol, Dept Phys, Tehran 111559161, Iran.
[Ricci, D.; Surdej, J.] Inst Astrophys & Geophys, B-4000 Liege, Belgium.
[Southworth, J.] Univ Keele, Astrophys Grp, Keele ST5 5BG, Staffs, England.
[Thone, C. C.] INAF, Osservatorio Astron Brera, I-23806 Merate, LC, Italy.
EM gould@astronomy.ohio-state.edu; dong@ias.edu;
gaudi@astronomy.ohio-state.edu; udalski@astrouw.edu.pl;
i.a.bond@massey.ac.nz; John.Greenhill@utas.edu.au;
md35@st-andrews.ac.uk; sumi@stelab.nagoya-u.ac.jp; msz@astrouw.edu;
cheongho@astroph.chungbuk.ac.kr; whallen@xtra.co.nz; gbolt@iinet.net.au;
molehill@ihug.co.nz; gwchristie@christie.org.nz; depoy@physics.tamu.edu;
john_drummond@xtra.co.nz; jdeast@astronomy.ohio-state.edu;
avishay.gal-yam@weizmann.ac.il; dhi67540@bigpond.net.au;
shai@wise.tau.ac.il; simkoz@astronomy.ohio-state.edu; leecu@kasi.re.kr;
francomallia@campocatinobservatory.org; alain@spaceobs.com;
dani@wise.tau.ac.il; farmcoveobs@xtra.co; lagmonar@nmisa.org;
acrux@orcon.net.nz; nick.morgan@alum.mit.edu; tim.natusch@aut.ac.nz;
eran@astro.caltech.edu; bgpark@kasi.re.kr;
pogge@astronomy.ohio-state.edu; david@wise.tau.ac.il;
obs930@southernstars-observatory.org; shporer@wise.tau.ac.il;
odedspec@wise.tau.ac; guy.thornley@gmail.com;
jyee@astronomy.ohio-state.edu; mk@astrouw.edu.pl;
pietrzyn@astrouw.edu.pl; soszynsk@astrouw.edu.pl;
szewczyk@astro-udec.cl; wyrzykow@ast.cam.ac.uk; kulaczyk@astrouw.edu.pl;
rpoleski@astrouw.edu.pl; abe@stelab.nagoya-u.ac.jp; bennett@nd.edu;
c.botzler@auckland.ac.nz; afukui@stelab.nagoya-u.ac.jp;
furusawa@stelab.nagoya-u.ac.jp; itow@stelab.nagoya-u.ac.jp;
kkamiya@stelab.nagoya-u.ac.jp; a.korpela@niwa.co.nz; w.lin@massey.ac.nz;
c.h.ling@massey.ac.nz; kmasuda@stelab.nagoya-u.ac.jp;
ymatsu@stelab.nagoya-u.ac.jp; nmiyake@stelab.nagoya-u.ac.jp;
nmiyake@stelab.nagya-u.ac.jp; mnagaya@stelab.nagoya-u.ac.jp;
okumurat@stelab.nagoya-u.ac.jp; yper006@aucklanduni.ac.nz;
sako@stelab.nagoya-u.ac.jp; denis.sullivan@vuw.ac.nz;
w.sweatman@massey.ac.nz; p.yock@auckland.ac.nz; beaulieu@iap.fr;
sbrillan@eso.org; caldwell@astro.as.utexas.edu;
HoffmaMJ.SCI@mail.uovs.ac.za; Andrew.Cole@utas.edu.au; kcook@llnl.gov;
coutures@iap.fr; donatowicz@tuwien.ac.at; pfouque@ast.obs-mip.fr;
skane@ipac.caltech.edu; nk87@st-andrews.ac.uk; dkubas@eso.org;
marquett@iap.fr; rmartin@physics.uwa.edu.au; ep41@st-andrews.ac.uk;
andrew@physics.uwa.edu.au; kdh1@st-andrews.ac.uk;
Eamonn.Kerins@manchester.ac.uk
RI Gaudi, Bernard/I-7732-2012; Dong, Subo/J-7319-2012; Kane,
Stephen/B-4798-2013; Greenhill, John/C-8367-2013; Kozlowski,
Szymon/G-4799-2013; 7, INCT/H-6207-2013; Astrofisica, Inct/H-9455-2013;
Williams, Andrew/K-2931-2013; Hundertmark, Markus/C-6190-2015; Rahvar,
Sohrab/A-9350-2008;
OI Cole, Andrew/0000-0003-0303-3855; Eastman, Jason/0000-0003-3773-5142;
Thone, Christina/0000-0002-7978-7648; Ricci, Davide/0000-0002-9790-0552;
Snodgrass, Colin/0000-0001-9328-2905; Dominik,
Martin/0000-0002-3202-0343; Kozlowski, Szymon/0000-0003-4084-880X;
Williams, Andrew/0000-0001-9080-0105; Hundertmark,
Markus/0000-0003-0961-5231; Rahvar, Sohrab/0000-0002-7084-5725;
Philpott, Lydia/0000-0002-5286-8528
FU NSF [AST 0757888, AST-0708890]; NASA [1277721]; Polish MNiSW
[N20303032/4275]; Marsden Fund of New Zealand; JSPS; MEXT of Japan;
PPARC (Particle Physics and Astronomy Research Council); STFC (Science
and Technology Facilities Council); National Research Foundation of
Korea [2009-0081561]; EU; Minerva Foundation, Benoziyo Center for
Astrophysics; Weizmann Institute; Technion; Israel-Niedersachsen
collaboration program; [JSPS18749004]; [JSPS20740104]; [MEXT19015005]
FX Work by A. G. was supported in part by NSF grant AST 0757888 and in part
by NASA grant 1277721 issued by JPL/Caltech. Work by S. D. was performed
under contract with the California Institute of Technology (Caltech)
funded by NASA through the Sagan Fellowship Program. This work was
supported in part by an allocation of computing time from the Ohio
Supercomputer Center. The OGLE project is partially supported by the
Polish MNiSW grant N20303032/4275 to AU. The MOA collaboration was
supported by the Marsden Fund of New Zealand. The MOA collaboration and
a part of authors are supported by the Grant-in-Aid for Scientific
Research, JSPS Research fellowships and the Global COE Program "Quest
for Fundamental Principles in the Universe" from JSPS and MEXT of Japan.
T. S. acknowledges support from grants JSPS18749004, JSPS20740104, and
MEXT19015005. The RoboNet project acknowledges support from PPARC
(Particle Physics and Astronomy Research Council) and STFC (Science and
Technology Facilities Council). C. H. was supported by Creative Research
Initiative Program (2009-0081561) of National Research Foundation of
Korea. AGY's activity is supported by a Marie Curie IRG grant from the
EU, and by the Minerva Foundation, Benoziyo Center for Astrophysics, a
research grant from Peter and Patricia Gruber Awards, and the William Z.
and Eda Bess Novick New Scientists Fund at the Weizmann Institute. D. P.
B. was supported by grants AST-0708890 from the NSF and NNX07AL71G from
NASA. Work by S. K. was supported at the Technion by the Kitzman
Fellowship and by a grant from the Israel-Niedersachsen collaboration
program. Mt Canopus observatory is financially supported by Dr. David
Warren.
NR 62
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PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 10
PY 2010
VL 720
IS 2
BP 1073
EP 1089
DI 10.1088/0004-637X/720/2/1073
PG 17
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647ND
UT WOS:000281624300011
ER
PT J
AU Acciari, VA
Arlen, T
Aune, T
Beilicke, M
Benbow, W
Boltuch, D
Bradbury, SM
Buckley, JH
Bugaev, V
Byrum, K
Cannon, A
Cesarini, A
Christiansen, JL
Ciupik, L
Cui, W
Dickherber, R
Duke, C
Finley, JP
Finnegan, G
Furniss, A
Galante, N
Godambe, S
Grube, J
Guenette, R
Gyuk, G
Hanna, D
Holder, J
Hui, CM
Humensky, TB
Imran, A
Kaaret, P
Karlsson, N
Kertzman, M
Kieda, D
Konopelko, A
Krawczynski, H
Krennrich, F
Maier, G
McArthur, S
McCann, A
McCutcheon, M
Moriarty, P
Ong, RA
Otte, AN
Pandel, D
Perkins, JS
Pohl, M
Quinn, J
Ragan, K
Reyes, LC
Reynolds, PT
Roache, E
Rose, HJ
Schroedter, M
Sembroski, GH
Senturk, GD
Smith, AW
Steele, D
Swordy, SP
Tesic, G
Theiling, M
Thibadeau, S
Varlotta, A
Vassiliev, VV
Vincent, S
Wagner, RG
Wakely, SP
Ward, JE
Weekes, TC
Weinstein, A
Weisgarber, T
Williams, DA
Wissel, S
Zitzer, B
AF Acciari, V. A.
Arlen, T.
Aune, T.
Beilicke, M.
Benbow, W.
Boltuch, D.
Bradbury, S. M.
Buckley, J. H.
Bugaev, V.
Byrum, K.
Cannon, A.
Cesarini, A.
Christiansen, J. L.
Ciupik, L.
Cui, W.
Dickherber, R.
Duke, C.
Finley, J. P.
Finnegan, G.
Furniss, A.
Galante, N.
Godambe, S.
Grube, J.
Guenette, R.
Gyuk, G.
Hanna, D.
Holder, J.
Hui, C. M.
Humensky, T. B.
Imran, A.
Kaaret, P.
Karlsson, N.
Kertzman, M.
Kieda, D.
Konopelko, A.
Krawczynski, H.
Krennrich, F.
Maier, G.
McArthur, S.
McCann, A.
McCutcheon, M.
Moriarty, P.
Ong, R. A.
Otte, A. N.
Pandel, D.
Perkins, J. S.
Pohl, M.
Quinn, J.
Ragan, K.
Reyes, L. C.
Reynolds, P. T.
Roache, E.
Rose, H. J.
Schroedter, M.
Sembroski, G. H.
Senturk, G. Demet
Smith, A. W.
Steele, D.
Swordy, S. P.
Tesic, G.
Theiling, M.
Thibadeau, S.
Varlotta, A.
Vassiliev, V. V.
Vincent, S.
Wagner, R. G.
Wakely, S. P.
Ward, J. E.
Weekes, T. C.
Weinstein, A.
Weisgarber, T.
Williams, D. A.
Wissel, S.
Zitzer, B.
TI VERITAS SEARCH FOR VHE GAMMA-RAY EMISSION FROM DWARF SPHEROIDAL GALAXIES
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE dark matter; galaxies: dwarf; gamma rays: galaxies
ID EXPLORING HALO SUBSTRUCTURE; DARK-MATTER SUBSTRUCTURE; VELOCITY
DISPERSION PROFILES; MILKY-WAY HALO; URSA-MINOR; GIANT STARS; DENSITY
PROFILES; GALACTIC-CENTER; DRACO; TELESCOPE
AB Indirect dark matter searches with ground-based gamma-ray observatories provide an alternative for identifying the particle nature of dark matter that is complementary to that of direct search or accelerator production experiments. We present the results of observations of the dwarf spheroidal galaxies Draco, Ursa Minor, Bootes 1, and Willman 1 conducted by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). These galaxies are nearby dark matter dominated objects located at a typical distance of several tens of kiloparsecs for which there are good measurements of the dark matter density profile from stellar velocity measurements. Since the conventional astrophysical background of very high energy gamma rays from these objects appears to be negligible, they are good targets to search for the secondary gamma-ray photons produced by interacting or decaying dark matter particles. No significant gamma-ray flux above 200 GeV was detected from these four dwarf galaxies for a typical exposure of similar to 20 hr. The 95% confidence upper limits on the integral gamma-ray flux are in the range (0.4-2.2) x 10(-12) photons cm(-2) s(-1). We interpret this limiting flux in the context of pair annihilation of weakly interacting massive particles (WIMPs) and derive constraints on the thermally averaged product of the total self-annihilation cross section and the relative velocity of the WIMPs ( less than or similar to 10(-23) cm(3) s(-1) for m(chi) greater than or similar to 300 GeV c(-2)). This limit is obtained under conservative assumptions regarding the dark matter distribution in dwarf galaxies and is approximately 3 orders of magnitude above the generic theoretical prediction for WIMPs in the minimal supersymmetric standard model framework. However, significant uncertainty exists in the dark matter distribution as well as the neutralino cross sections which under favorable assumptions could further lower this limit.
C1 [Acciari, V. A.; Benbow, W.; Galante, N.; Perkins, J. S.; Roache, E.; Theiling, M.; Weekes, T. C.] Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA.
[Arlen, T.; Ong, R. A.; Vassiliev, V. V.; Weinstein, A.] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA.
[Aune, T.; Furniss, A.; Otte, A. N.; Williams, D. A.] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA.
[Aune, T.; Furniss, A.; Otte, A. N.; Williams, D. A.] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA.
[Beilicke, M.; Buckley, J. H.; Bugaev, V.; Dickherber, R.; Krawczynski, H.; McArthur, S.; Thibadeau, S.] Washington Univ, Dept Phys, St Louis, MO 63130 USA.
[Boltuch, D.; Holder, J.] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA.
[Boltuch, D.; Holder, J.] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA.
[Bradbury, S. M.; Rose, H. J.] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England.
[Byrum, K.; Smith, A. W.; Wagner, R. G.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Cannon, A.; Quinn, J.; Ward, J. E.] Natl Univ Ireland Univ Coll Dublin, Sch Phys, Dublin 4, Ireland.
[Cesarini, A.] Natl Univ Ireland Galway, Sch Phys, Galway, Ireland.
[Christiansen, J. L.] Calif Polytech State Univ San Luis Obispo, Dept Phys, San Luis Obispo, CA 94307 USA.
[Ciupik, L.; Grube, J.; Gyuk, G.; Karlsson, N.; Steele, D.] Adler Planetarium & Astron Museum, Dept Astron, Chicago, IL 60605 USA.
[Cui, W.; Finley, J. P.; Sembroski, G. H.; Varlotta, A.; Zitzer, B.] Purdue Univ, Dept Phys, W Lafayette, IN 47907 USA.
[Duke, C.] Grinnell Coll, Dept Phys, Grinnell, IA 50112 USA.
[Finnegan, G.; Godambe, S.; Hui, C. M.; Kieda, D.; Vincent, S.] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA.
[Guenette, R.; Hanna, D.; Maier, G.; McCann, A.; McCutcheon, M.; Ragan, K.; Tesic, G.] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada.
[Humensky, T. B.; Swordy, S. P.; Wakely, S. P.; Weisgarber, T.; Wissel, S.] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60637 USA.
[Imran, A.; Krennrich, F.; Pohl, M.; Schroedter, M.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Kaaret, P.; Pandel, D.] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
[Kertzman, M.] Depauw Univ, Dept Phys & Astron, Greencastle, IN 46135 USA.
[Konopelko, A.] Pittsburg State Univ, Dept Phys, Pittsburg, KS 66762 USA.
[Moriarty, P.] Galway Mayo Inst Technol, Dept Life & Phys Sci, Galway, Ireland.
[Reyes, L. C.] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA.
[Reynolds, P. T.] Cork Inst Technol, Dept Appl Phys & Instrumentat, Cork, Ireland.
[Senturk, G. Demet] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA.
RP Acciari, VA (reprint author), Harvard Smithsonian Ctr Astrophys, Fred Lawrence Whipple Observ, Amado, AZ 85645 USA.
EM rgwcdf@hep.anl.gov
OI Cui, Wei/0000-0002-6324-5772; Cesarini, Andrea/0000-0002-8611-8610;
Ward, John E/0000-0003-1973-0794; Pandel, Dirk/0000-0003-2085-5586
FU US National Science Foundation; US Department of Energy; Smithsonian
Institution; NSERC in Canada; Science Foundation Ireland; STFC in the
UK; U.S. National Science Foundation [0422093]
FX This research is supported by grants from the US National Science
Foundation, the US Department of Energy, and the Smithsonian
Institution, by NSERC in Canada, by Science Foundation Ireland, and by
STFC in the UK. We acknowledge the excellent work of the technical
support staff at the FLWO and the collaborating institutions in the
construction and operation of the instrument. V. V. V. acknowledges the
support of the U.S. National Science Foundation under CAREER program
(Grant No. 0422093).
NR 71
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PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
EI 1538-4357
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 10
PY 2010
VL 720
IS 2
BP 1174
EP 1180
DI 10.1088/0004-637X/720/2/1174
PG 7
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647ND
UT WOS:000281624300021
ER
PT J
AU Hearin, AP
Zentner, AR
Ma, ZM
Huterer, D
AF Hearin, Andrew P.
Zentner, Andrew R.
Ma, Zhaoming
Huterer, Dragan
TI A GENERAL STUDY OF THE INFLUENCE OF CATASTROPHIC PHOTOMETRIC REDSHIFT
ERRORS ON COSMOLOGY WITH COSMIC SHEAR TOMOGRAPHY
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE cosmology: theory; dark energy; galaxies: distances and redshifts;
galaxies: photometry; gravitational lensing: weak
ID LARGE-SCALE STRUCTURE; WEAK-LENSING SURVEYS; VIRMOS-DESCART SURVEY; DARK
ENERGY; POWER SPECTRUM; GALAXY SAMPLES; MATTER; CONSTRAINTS; HALO;
REQUIREMENTS
AB A goal of forthcoming imaging surveys is to use weak gravitational lensing shear measurements to constrain dark energy. A challenge to this program is that redshifts to the lensed, source galaxies must be determined using photometric, rather than spectroscopic, information. We quantify the importance of uncalibrated photometric redshift outliers to the dark energy goals of forthcoming imaging surveys in a manner that does not assume any particular photometric redshift technique or template. In so doing, we provide an approximate blueprint for computing the influence of specific outlier populations on dark energy constraints. We find that outlier populations whose photo-z distributions are tightly localized about a significantly biased redshift must be controlled to a per-galaxy rate of (1-3) x 10(-3) to insure that systematic errors on dark energy parameters are rendered negligible. In the complementary limit, a subset of imaged galaxies with uncalibrated photometric redshifts distributed over a broad range must be limited to fewer than a per-galaxy error rate of F-cat less than or similar to (2-4) x 10(-4). Additionally, we explore the relative importance of calibrating the photo-z's of a core set of relatively well-understood galaxies as compared to the need to identify potential catastrophic photo-z outliers. We discuss the degradation of the statistical constraints on dark energy parameters induced by excising source galaxies at high-and low-photometric redshifts, concluding that removing galaxies with photometric redshifts z(ph) greater than or similar to 2.4 and z(ph) less than or similar to 0.3 may mitigate damaging catastrophic redshift outliers at a relatively small (less than or similar to 20%) cost in statistical error. In an Appendix, we show that forecasts for the degradation in dark energy parameter constraints due to uncertain photometric redshifts depend sensitively on the treatment of the nonlinear matter power spectrum. In particular, previous work using Peacock & Dodds may have overestimated the photo-z calibration requirements of future surveys.
C1 [Hearin, Andrew P.; Zentner, Andrew R.] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA.
[Ma, Zhaoming] Brookhaven Natl Lab, Upton, NY 11973 USA.
[Ma, Zhaoming] Univ Penn, Dept Astron & Astrophys, Philadelphia, PA 19104 USA.
[Huterer, Dragan] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA.
RP Hearin, AP (reprint author), Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA.
FU University of Pittsburgh; National Science Foundation (NSF) [AST
0806367, AST 0807564]; Department of Energy (DOE)
[DOE-DE-AC02-98CH10886, DOE-DE-FG02-95ER40893, DOE-DE-FG02-95ER40899];
National Aeronautics and Space Administration [NNX09AC89G]; Michigan
Center for Theoretical Physics at the University of Michigan
FX We thank Carlos Cunha, Joe Davola, Scott Dodelson, Salman Habib, Wayne
Hu, Zeljko Ivezic, Bhuvnesh Jain, Arthur Kosowsky, Dan Matthews, Jeff
Newman, Hiro Oyaizu, Martin White, and Michael Wood-Vasey for useful
discussions and email exchanges during the course of this work. We are
particularly grateful to Gary Bernstein and Alexia Schulz for detailed
comments on an early draft of this manuscript. A.P.H. and A.R.Z. are
supported by the University of Pittsburgh and by the National Science
Foundation (NSF) through grant NSF AST 0806367 and by the Department of
Energy (DOE). Z.M. is supported by the DOE under contracts
DOE-DE-AC02-98CH10886 and DOE-DE-FG02-95ER40893. D.H. is supported by
the DOE OJI under contract DOE-DE-FG02-95ER40899, NSF under grant NSF
AST 0807564, and the National Aeronautics and Space Administration under
grant NNX09AC89G. A.R.Z. and A.P.H. thank the organizers of the 2009
Santa Fe Cosmology Workshop, where a significant portion of this work
was completed. A.R.Z. thanks the Michigan Center for Theoretical Physics
at the University of Michigan for hospitality and support while some of
this work was performed. This research made use of the National
Aeronautics and Space Administration Astrophysics Data System.
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PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
EI 1538-4357
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 10
PY 2010
VL 720
IS 2
BP 1351
EP 1369
DI 10.1088/0004-637X/720/2/1351
PG 19
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647ND
UT WOS:000281624300036
ER
PT J
AU Hole, KT
Kasen, D
Nordsieck, KH
AF Hole, K. T.
Kasen, D.
Nordsieck, K. H.
TI SPECTROPOLARIMETRIC SIGNATURES OF CLUMPY SUPERNOVA EJECTA
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE line: profiles; methods: numerical; polarization; radiative transfer;
supernovae: general
ID IA SUPERNOVAE; POLARIZATION; EXPLOSION; DETONATION; DEVIATION; SYMMETRY;
SPECTRA; LIGHT
AB Polarization has been detected at early times for all types of supernovae (SNe), indicating that all such systems result from or quickly develop some form of asymmetry. In addition, the detection of strong line polarization in SNe is suggestive of chemical inhomogeneities ("clumps") in the layers above the photosphere, which may reflect hydrodynamical instabilities during the explosion. We have developed a fast, flexible, approximate semi-analytic code for modeling polarized line radiative transfer within three-dimensional inhomogeneous rapidly expanding atmospheres. Given a range of model parameters, the code generates random sets of clumps in the expanding ejecta and calculates the emergent line profile and Stokes parameters for each configuration. The ensemble of these configurations represents the effects both of various host geometries and of different viewing angles. We present results for the first part of our survey of model geometries, specifically the effects of the number and size of clumps (and the related effect of filling factor) on the emergent spectrum and Stokes parameters. Our simulations show that random clumpiness can produce line polarization in the range observed in SNe Ia, as well as the Q-U loops that are frequently seen in all SNe. We have also developed a method to connect the results of our simulations to robust observational parameters such as maximum polarization and polarized equivalent width in the line. Our models, in connection with spectropolarimetric observations, can constrain the three-dimensional structure of SN ejecta and offer important insight into the SN explosion physics and the nature of their progenitor systems.
C1 [Hole, K. T.; Nordsieck, K. H.] Univ Wisconsin, Dept Astron, Madison, WI 53706 USA.
[Kasen, D.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Kasen, D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Hole, K. T.] E Tennessee State Univ, Dept Phys, Johnson City, TN 37614 USA.
RP Hole, KT (reprint author), Univ Wisconsin, Dept Astron, Madison, WI 53706 USA.
FU NSF [AST-0922981, PHY 05-51164, AST 07-07633]; DOE [DE-FC02-06ER41438]
FX K.T.H. is grateful to Jay Gallagher, Jennifer Hoffman, and Rico Ignace
for helpful discussion on this work. This research was funded in part by
NSF grants AST-0922981, PHY 05-51164, and AST 07-07633, and by the DOE
SciDAC Program (DE-FC02-06ER41438).
NR 28
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PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 10
PY 2010
VL 720
IS 2
BP 1500
EP 1512
DI 10.1088/0004-637X/720/2/1500
PG 13
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647ND
UT WOS:000281624300048
ER
PT J
AU McKee, CF
Li, PS
Klein, RI
AF McKee, Christopher F.
Li, Pak Shing
Klein, Richard I.
TI SUB-ALFVENIC NON-IDEAL MHD TURBULENCE SIMULATIONS WITH AMBIPOLAR
DIFFUSION. II. COMPARISON WITH OBSERVATION, CLUMP PROPERTIES, AND
SCALING TO PHYSICAL UNITS
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE ISM: kinematics and dynamics; ISM: magnetic fields; magnetic fields;
magnetohydrodynamics (MHD); stars: formation
ID INITIAL MASS FUNCTION; REGULATED STAR-FORMATION; DENSE CLOUD CORES;
MAGNETIC INTERSTELLAR CLOUDS; GALACTIC MOLECULAR CLOUDS; IONIZATION
FRACTION; SHOCK-WAVES; MAGNETOHYDRODYNAMIC TURBULENCE; FORMATION
EFFICIENCY; FIELDS
AB Ambipolar diffusion (AD) is important in redistributing magnetic flux and in damping Alfven waves in molecular clouds. The importance of AD on a length scale l is governed by the AD Reynolds number, R(AD) = l/l(AD), where l(AD) is the characteristic length scale for AD. The logarithmic mean of the AD Reynolds number in a sample of 15 molecular clumps with measured magnetic fields is 17, comparable to the theoretically expected value. We identify several regimes of AD in a turbulent medium, depending on the ratio of the flow time to collision times between ions and neutrals; the clumps observed by Crutcher in 1999 are all in the standard regime of AD, in which the neutrals and ions are coupled over a flow time. We have carried out two-fluid simulations of AD in isothermal, turbulent boxes for a range of values of R(AD). The mean Mach numbers were fixed at M = 3 and M(A) = 0.67; self-gravity was not included. We study the properties of overdensities-i.e., clumps-in the simulation and show that the slope of the higher-mass portion of the clump mass spectrum increases as R(AD) decreases, which is qualitatively consistent with Padoan et al.'s finding that the mass spectrum in hydrodynamic turbulence is significantly steeper than in ideal MHD turbulence. For a value of R(AD) similar to the observed value, we find a slope that is consistent with that of the high-mass end of the initial mass function (IMF) for stars. However, the value we find for the spectral index in our ideal MHD simulation differs from theirs, presumably because our simulations have different initial conditions. This suggests that the mass spectrum of the clumps in the Padoan et al. turbulent fragmentation model for the IMF depends on the environment, which would conflict with evidence for a universal IMF. In addition, we give a general discussion of how the results of simulations of magnetized, turbulent, isothermal boxes can be scaled to physical systems. Each physical process that is introduced into the simulation, such as AD, introduces a dimensionless parameter, such as R(AD), which must be fixed for the simulation, thereby reducing the number of scaling parameters by one. We show that the importance of self-gravity is fixed in any simulation of AD; it is not possible to carry out a simulation in which self-gravity and AD are varied independently unless the ionization is a free parameter. We show that our simulations apply to small regions in molecular clouds, generally with l(0) less than or similar to 0.4 pc and M less than or similar to 25 M(circle dot). A general discussion of the scaling relations for magnetized, isothermal, turbulent boxes, including self-gravitating systems, is given in the appendix.
C1 [McKee, Christopher F.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[McKee, Christopher F.; Li, Pak Shing; Klein, Richard I.] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA.
[McKee, Christopher F.] Ecole Normale Super, LRA, LERMA, F-75005 Paris, France.
[Klein, Richard I.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP McKee, CF (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM cmckee@astro.berkeley.edu; psli@astron.berkeley.edu;
klein@astron.berkeley.edu
FU NSF [AST-0606831, AST-0908553]; NASA [NNX09AK31G]; Groupement d'Interet
Scientifique (GIS); US Department of Energy at Lawrence Livermore
National Laboratory [DE-AC52-07NA 27344]; National Center of
Supercomputing Application [TG-MCA00N020]
FX We thank Charles Hansen, Patrick Hennebelle, Mark Heyer, Mark Krumholz,
Enrique Vazquez-Semadeni, Ellen Zweibel, and particularly an anonymous
referee and Telemachos Mouschovias for helpful comments. This research
has been supported by the NSF under grants AST-0606831 and AST-0908553
and by NASA under an ATFP grant, NNX09AK31G. C. F. M. also acknowledges
the support of the Groupement d'Interet Scientifique (GIS) "Physique des
deux infinis (P2I)" in the completion of this work. R. I. K. received
support for this work provided by the US Department of Energy at
Lawrence Livermore National Laboratory under contract DE-AC52-07NA
27344. This research was also supported by the grant of high-performance
computing resources from the National Center of Supercomputing
Application through grant TG-MCA00N020.
NR 90
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PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 10
PY 2010
VL 720
IS 2
BP 1612
EP 1634
DI 10.1088/0004-637X/720/2/1612
PG 23
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647ND
UT WOS:000281624300055
ER
PT J
AU Seo, HJ
Eckel, J
Eisenstein, DJ
Mehta, K
Metchnik, M
Padmanabhan, N
Pinto, P
Takahashi, R
White, M
Xu, XY
AF Seo, Hee-Jong
Eckel, Jonathan
Eisenstein, Daniel J.
Mehta, Kushal
Metchnik, Marc
Padmanabhan, Nikhil
Pinto, Phillip
Takahashi, Ryuichi
White, Martin
Xu, Xiaoying
TI HIGH-PRECISION PREDICTIONS FOR THE ACOUSTIC SCALE IN THE NONLINEAR
REGIME
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE distance scale; large-scale structure of universe; methods: numerical
ID LUMINOUS RED GALAXIES; DIGITAL SKY SURVEY; MICROWAVE BACKGROUND
ANISOTROPY; PROBE WMAP OBSERVATIONS; ANGULAR POWER SPECTRUM; BARYON
OSCILLATIONS; PERTURBATION-THEORY; REDSHIFT SURVEYS; REAL-SPACE;
GRAVITATIONAL-INSTABILITY
AB We measure shifts of the acoustic scale due to nonlinear growth and redshift distortions to a high precision using a very large volume of high-force-resolution simulations. We compare results from various sets of simulations that differ in their force, volume, and mass resolution. We find a consistency within 1.5 sigma for shift values from different simulations and derive shift alpha(z) - 1 = (0.300 +/- 0.015)%[ D(z)/D(0)](2) using our fiducial set. We find a strong correlation with a non-unity slope between shifts in real space and in redshift space and a weak correlation between the initial redshift and low redshift. Density-field reconstruction not only removes the mean shifts and reduces errors on the mean, but also tightens the correlations. After reconstruction, we recover a slope of near unity for the correlation between the real and redshift space and restore a strong correlation between the initial and the low redshifts. We derive propagators and mode-coupling terms from our N-body simulations and compare with the Zel'dovich approximation and the shifts measured from the chi(2) fitting, respectively. We interpret the propagator and the mode-coupling term of a nonlinear density field in the context of an average and a dispersion of its complex Fourier coefficients relative to those of the linear density field; from these two terms, we derive a signal-to-noise ratio of the acoustic peak measurement. We attempt to improve our reconstruction method by implementing 2LPT and iterative operations, but we obtain little improvement. The Fisher matrix estimates of uncertainty in the acoustic scale is tested using 5000 h(-3) Gpc(3) of cosmological Particle-Mesh simulations from Takahashi et al. At an expected sample variance level of 1%, the agreement between the Fisher matrix estimates based on Seo and Eisenstein and the N-body results is better than 10%.
C1 [Seo, Hee-Jong] Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Batavia, IL 60510 USA.
[Eckel, Jonathan; Eisenstein, Daniel J.; Mehta, Kushal; Metchnik, Marc; Pinto, Phillip; Xu, Xiaoying] Univ Arizona, Steward Observ, Tucson, AZ 85121 USA.
[Padmanabhan, Nikhil] Yale Univ, Dept Phys, New Haven, CT 06511 USA.
[Takahashi, Ryuichi] Hirosaki Univ, Fac Sci & Technol, Hirosaki, Aomori 0368560, Japan.
[White, Martin] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[White, Martin] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA.
RP Seo, HJ (reprint author), Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, POB 500, Batavia, IL 60510 USA.
EM sheejong@fnal.gov
RI Takahashi, Ryuichi/F-3362-2013; White, Martin/I-3880-2015
OI White, Martin/0000-0001-9912-5070
FU U.S. Department of Energy [DE-AC02-07CH11359]; NSF [AST-0707725]; NASA
[BEFS NNX07AH11G]; [467]
FX We thank Martin Crocce for useful conversations. H-J.S. is supported by
the U.S. Department of Energy under contract No. DE-AC02-07CH11359.
J.E., D.J.E., K. M., and X. X. were supported by NSF AST-0707725 and by
NASA BEFS NNX07AH11G. R. T. is supported by Grant-in-Aid for Scientific
Research on Priority Areas No. 467 "Probing the Dark Energy through an
Extremely Wide and Deep Survey with Subaru Telescope." M. W. was
partially supported by NASA BEFS NNX07AH11G.
NR 79
TC 65
Z9 65
U1 0
U2 2
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 10
PY 2010
VL 720
IS 2
BP 1650
EP 1667
DI 10.1088/0004-637X/720/2/1650
PG 18
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647ND
UT WOS:000281624300058
ER
PT J
AU Assary, RS
Redfern, PC
Hammond, JR
Greeley, J
Curtiss, LA
AF Assary, Rajeev S.
Redfern, Paul C.
Hammond, Jeff R.
Greeley, Jeffrey
Curtiss, Larry A.
TI Predicted thermochemistry for chemical conversions of
5-hydroxymethylfurfural
SO CHEMICAL PHYSICS LETTERS
LA English
DT Article
ID ZERO-POINT ENERGIES; LIQUID ALKANES; ALDOL-CONDENSATION; BIOMASS;
HYDROGENATION; HYDROCARBONS; DEHYDRATION; GEOMETRIES; FUELS
AB The thermochemistry of various chemical transformations of 5-hydroxy methyl furfural (HMF) were investigated using highly accurate GAUSSIAN-4 (G4) theory. The conversion of HMF to nonane through aldol condensation, hydrogenation, and hydrogenolysis reactions was found to be thermodynamically favorable. The hydrogenation reactions involving the keto groups in the nonane reaction sequence were found to be enhanced at low temperatures and high pressures of H(2). The hydrogenation, selective oxidation, and hydration of HMF were also found to be thermodynamically favorable. Gas phase enthalpies of formation of all the intermediate compounds were calculated at the G4 level of theory and compared against existing experimental data. (C) 2010 Elsevier B. V. All rights reserved.
C1 [Assary, Rajeev S.] Northwestern Univ, Evanston, IL 60208 USA.
[Assary, Rajeev S.; Curtiss, Larry A.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Redfern, Paul C.] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
[Greeley, Jeffrey; Curtiss, Larry A.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
[Hammond, Jeff R.] Argonne Natl Lab, Argonne Leadership Comp Facil, Argonne, IL 60439 USA.
RP Assary, RS (reprint author), Northwestern Univ, Evanston, IL 60208 USA.
EM rajeev@anl.gov; curtiss@anl.gov
RI Surendran Assary, Rajeev/E-6833-2012; Hammond, Jeff/G-8607-2013
OI Surendran Assary, Rajeev/0000-0002-9571-3307; Hammond,
Jeff/0000-0003-3181-8190
FU US Department of Energy [DE-AC0206CH11357]; Institute for Atom-efficient
Chemical Transformations (IACT); US Department of Energy, Office of
Science, Office of Basic Energy Sciences; Pacific Northwest National
Laboratory; ANL Laboratory Computing Resource Center (LCRC); Center of
Nanoscale materials (CNM)
FX This work was supported by the US Department of Energy under Contract
DE-AC0206CH11357 and supported as part of the Institute for
Atom-efficient Chemical Transformations (IACT), an Energy Frontier
Research Center funded by the US Department of Energy, Office of
Science, Office of Basic Energy Sciences.; We gratefully acknowledge
grants of computer time a national scientific user facility located at
Pacific Northwest National Laboratory, ANL Laboratory Computing Resource
Center (LCRC), and Center of Nanoscale materials (CNM).
NR 22
TC 24
Z9 24
U1 1
U2 43
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0009-2614
J9 CHEM PHYS LETT
JI Chem. Phys. Lett.
PD SEP 10
PY 2010
VL 497
IS 1-3
BP 123
EP 128
DI 10.1016/j.cplett.2010.07.082
PG 6
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 646GM
UT WOS:000281526700026
ER
PT J
AU Subbaraman, R
Strmcnik, D
Paulikas, AP
Stamenkovic, VR
Markovic, NM
AF Subbaraman, Ram
Strmcnik, Dusan
Paulikas, Arvydas P.
Stamenkovic, Vojislav R.
Markovic, Nenad M.
TI Oxygen Reduction Reaction at Three-Phase Interfaces
SO CHEMPHYSCHEM
LA English
DT Article
DE electrochemistry; interfaces; kinetics; oxygen reduction; Nafion-Pt
three-phase interface
ID SINGLE-CRYSTAL ELECTRODES; TRANSFORM INFRARED-SPECTROSCOPY; FUEL-CELL
ELECTROCATALYSTS; SULFURIC-ACID-SOLUTION; O-2 REDUCTION; BISULFATE
ADSORPTION; ANION ADSORPTION; NAFION INTERFACE; METAL-SURFACES; PLATINUM
AB The kinetics of the oxygen reduction reaction (ORR) is studied at metal-supporting electrolyte-Nafion three-phase interfaces. We first demonstrate that the sulfonate anions of Nafion are specifically adsorbed on a wide range of surfaces ranging from Pt(hkl) single-crystal surfaces, Pt-poly, Pt-skin [produced on a Pt(3)Ni(111) surface by annealing in ultrahigh vacuum, UHV] to high-surface-area nanostructured thin-film (NSTF) catalysts. The surface coverage by sulfonate and the strength of the Pt-sulfonate interaction are strongly dependent on the geometry and the nature of the Pt surface atoms. Also, they are found to behave analogous to (bi)sulfate anion-specific adsorption on these surfaces, where for the Pt(hkl) surfaces, the trend is Pt(111) > Pt(110) > Pt(100) and for the Pt-skin surface on Pt(3)Ni(111), the interaction strength is found to be Pt-skin < Pt(111). We also found that irrespective of the surface orientation and/or the electronic properties of the surface atoms, the ORR is always inhibited by the presence of ionomers at the electrode surface, confirming that Nafion is not a non-adsorbing electrolyte. Finally, the knowledge gained from studying well-defined Pt(hkl) surfaces is applied to propose that deactivation of the ORR on Nafion-covered high-surface-area catalysts is also controlled by specific adsorption of sulfonate anions.
C1 [Strmcnik, Dusan; Stamenkovic, Vojislav R.; Markovic, Nenad M.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Subbaraman, Ram; Paulikas, Arvydas P.] Argonne Natl Lab, Dept Nucl Engn, Argonne, IL 60439 USA.
RP Markovic, NM (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM nmmarkovic@anl.gov
FU U.S. Department of Energy, Office of Basic Energy Sciences, Materials
Science Division [DE-AC02-06CH11357]; Argonne National Laboratory
FX This work was supported by the U.S. Department of Energy, Office of
Basic Energy Sciences, Materials Science Division under Contract No.
DE-AC02-06CH11357. R.S. would like to acknowledge Argonne National
Laboratory postdoctoral fellowship for his funding..
NR 42
TC 64
Z9 64
U1 11
U2 101
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY
SN 1439-4235
J9 CHEMPHYSCHEM
JI ChemPhysChem
PD SEP 10
PY 2010
VL 11
IS 13
SI SI
BP 2825
EP 2833
DI 10.1002/cphc.201000190
PG 9
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 659AJ
UT WOS:000282539100016
PM 20648513
ER
PT J
AU Dolotko, O
Zhang, HQ
Li, S
Jena, P
Pecharsky, V
AF Dolotko, Oleksandr
Zhang, Haiqiao
Li, Sa
Jena, Puru
Pecharsky, Vitalij
TI Mechanochemically driven nonequilibrium processes in MNH2-CaH2 systems
(M = Li or Na)
SO JOURNAL OF ALLOYS AND COMPOUNDS
LA English
DT Article
DE Hydrides; Hydrogen storage; Mechanical milling; Density functional
theory
ID HYDROGEN STORAGE-SYSTEM; CRYSTAL-STRUCTURE; H SYSTEM;
NEUTRON-DIFFRACTION; DICALCIUM NITRIDE; CALCIUM NITRIDE; METAL NITRIDES;
AMIDE; IMIDE; CA
AB Mechanochemical transformations of lithium and sodium amides with calcium hydride have been investigated using gas volumetric analysis, X-ray powder diffraction, and residual gas analysis. The overall mechanochemical transformations are equimolar, and they proceed as the following solid state reaction: MNH2 + CaH2 -> CaNH + MH + H-2, where M = Li or Na. The transformation kinetics of the lithium containing system is markedly faster compared to the system with sodium. The difference in the rates of solid state transformations, and therefore, in hydrogen release kinetics can be explained by difference in mobility of lithium and sodium atoms. Total energies and enthalpies of formation for different reaction products during the dehydrogenation of CaH2-MNH2 mixtures were calculated using density functional theory. Compared to thermochemical transformations, which proceed in accordance with thermodynamic equilibrium, reactions induced by mechanical energy drive the MNH2-CaH2 systems to nonequilibrium configurations with different final products. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Pecharsky, Vitalij] Iowa State Univ, Ames Lab, Dept Mat Sci & Engn, Ames, IA 50011 USA.
[Dolotko, Oleksandr; Zhang, Haiqiao; Pecharsky, Vitalij] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA.
[Li, Sa; Jena, Puru] Virginia Commonwealth Univ, Dept Phys, Richmond, VA 23284 USA.
RP Pecharsky, V (reprint author), Iowa State Univ, Ames Lab, Dept Mat Sci & Engn, Ames, IA 50011 USA.
EM vitkp@ameslab.gov
FU Office of Basic Energy Science, Materials Sciences Division of the
Office of Science of the US Department of Energy; Office of Science of
the United States Department of Energy [DE-AC02-07CH11358]; Office of
Science of the US Department of Energy [DE-AC02-05-CH11231]
FX Support of this work by the Office of Basic Energy Science, Materials
Sciences Division of the Office of Science of the US Department of
Energy is acknowledged. Ames Laboratory is supported by the Office of
Science of the United States Department of Energy under contract No.
DE-AC02-07CH11358 with Iowa State University. The computations used
resources of the National Energy Research Scientific Computing Center,
which is supported by the Office of Science of the US Department of
Energy under Contract No. DE-AC02-05-CH11231.
NR 48
TC 3
Z9 3
U1 3
U2 18
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0925-8388
J9 J ALLOY COMPD
JI J. Alloy. Compd.
PD SEP 10
PY 2010
VL 506
IS 1
BP 224
EP 230
PG 7
WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &
Metallurgical Engineering
SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
GA 655IJ
UT WOS:000282242700045
ER
PT J
AU Wang, SW
Zhao, F
Zhang, LL
Brinkman, K
Chen, FL
AF Wang, Siwei
Zhao, Fei
Zhang, Lingling
Brinkman, Kyle
Chen, Fanglin
TI Stability and electrical property of Ba1-xSrxC0.8Y0.2O3-delta high
temperature proton conductor
SO JOURNAL OF ALLOYS AND COMPOUNDS
LA English
DT Article
DE Barium cerate; Strontium cerate; Proton conductor; Electrical
conductivity; Stability
ID OXIDE FUEL-CELLS; INTERMEDIATE TEMPERATURE; TRANSPORT-PROPERTIES;
COMPLEXING PROCESS; SINTERED OXIDES; BACEO3; ELECTROLYTE; ATMOSPHERES;
CERAMICS; PEROVSKITES
AB The morphological and electrical properties of Ba1-xSrxCe0.8Y0.2O3-delta with x in the range from 0 to 1 prepared by a modified Pechini method were investigated as potential high temperature proton conductors. Dense microstructures were achieved for all the samples upon sintering at 1500 degrees C for 5 h. The phase structure analysis indicated that perovskite phase was formed for 0 <= x <= 0.2, while for x larger than 0.5, impurity phases of Sr2CeO4 and Y2O3 appeared. The tolerance to H2O for the samples improved with the increase in Sr content when exposed to boiling water, while the electrical conductivity decreased from x =0 to 1. However, the resistance to CO2 attack at elevated temperatures was not improved for Ba1-xSrxCe0.8Y0.2O3-delta within the whole x range studied. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Wang, Siwei; Zhao, Fei; Zhang, Lingling; Chen, Fanglin] Univ S Carolina, Dept Mech Engn, Columbia, SC 29208 USA.
[Brinkman, Kyle] Savannah River Natl Lab, Aiken, SC 29808 USA.
RP Chen, FL (reprint author), Univ S Carolina, Dept Mech Engn, 300 Main St, Columbia, SC 29208 USA.
EM chenfa@cec.sc.edu
RI Zhang, Lingling/I-4031-2012; Chen, Fanglin/K-1039-2012; Wang,
Siwei/A-9048-2012;
OI Chen, Fanglin/0000-0001-9942-8872; Wang, Siwei/0000-0001-5118-8267
FU Department of Energy [09-510]; SRNL LDRD program
FX The authors acknowledge gratefully the financial support of the
Department of Energy Nuclear Energy University Program (NEUP) (award no.
09-510) and the SRNL LDRD program.
NR 42
TC 19
Z9 20
U1 2
U2 29
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0925-8388
J9 J ALLOY COMPD
JI J. Alloy. Compd.
PD SEP 10
PY 2010
VL 506
IS 1
BP 263
EP 267
DI 10.1016/j.jallcom.2010.06.188
PG 5
WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy &
Metallurgical Engineering
SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering
GA 655IJ
UT WOS:000282242700051
ER
PT J
AU Burns, KE
Cerda-Maira, FA
Wang, T
Li, HL
Bishai, WR
Darwin, KH
AF Burns, Kristin E.
Cerda-Maira, Francisca A.
Wang, Tao
Li, Huilin
Bishai, William R.
Darwin, K. Heran
TI "Depupylation" of Prokaryotic Ubiquitin-like Protein from Mycobacterial
Proteasome Substrates
SO MOLECULAR CELL
LA English
DT Article
ID TUBERCULOSIS PROTEASOME; IN-VIVO; PUP; PUPYLATION; DEGRADATION; ENZYMES
AB Ubiquitin (Ub) provides the recognition and specificity required to deliver proteins to the eukaryotic proteasome for destruction. Prokaryotic ubiquitin-like protein (Pup) is functionally analogous to Ub in Mycobacterium tuberculosis (Mtb), as it dooms proteins to the Mtb proteasome. Studies suggest that Pup and Ub do not share similar mechanisms of activation and conjugation to target proteins. Dop (deamidase of Pup; Mtb Ry2112c/MT2172) deamidates the C-terminal glutamine of Pup to glutamate, preparing it for ligation to target proteins by proteasome accessory factor A (PafA). While studies have shed light on the conjugation of Pup to proteins, it was not known if Pup could be removed from substrates in a manner analogous to the deconjugation of Ub from eukaryotic proteins. Here, we show that Mycobacteria have a "depupylase" activity provided by Dop. The discovery of a depupylase strengthens the parallels between the Pup- and Ub-tagging systems of prokaryotes and eukaryotes, respectively.
C1 [Burns, Kristin E.; Cerda-Maira, Francisca A.; Darwin, K. Heran] NYU, Sch Med, Dept Microbiol, New York, NY 10016 USA.
[Wang, Tao; Li, Huilin] Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA.
[Bishai, William R.] Johns Hopkins Sch Med, Dept Med, Div Infect Dis, Baltimore, MD 21231 USA.
RP Darwin, KH (reprint author), NYU, Sch Med, Dept Microbiol, New York, NY 10016 USA.
EM heran.darwin@med.nyu.edu
RI li, lianbo/H-1152-2011
FU NIH [HL92774, AI070285, AI 30036, 37856, 36973]; Burroughs Wellcome
Investigator in the Pathogenesis of Infectious Disease award
FX We are grateful to A. Darwin, D. Finley, T. Huang, and K. Walters for
critical review of drafts of this manuscript. We thank J. Raper and R.
Thomson for use of their FPLC instrumentation and Superdex 200 column.
We thank C. Barry for gifts of the proteasome mutant Msm and the polyG
vector and G. DeMartino and R. Hampton for helpful conversations. This
work was supported by NIH R01 grants HL92774 awarded to K.H.D., AI070285
awarded to H.L., and AI 30036, 37856, and 36973 awarded to W.R.B. K.H.D
is supported by a Burroughs Wellcome Investigator in the Pathogenesis of
Infectious Disease award.
NR 29
TC 52
Z9 54
U1 0
U2 7
PU CELL PRESS
PI CAMBRIDGE
PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA
SN 1097-2765
EI 1097-4164
J9 MOL CELL
JI Mol. Cell
PD SEP 10
PY 2010
VL 39
IS 5
BP 821
EP 827
DI 10.1016/j.molcel.2010.07.019
PG 7
WC Biochemistry & Molecular Biology; Cell Biology
SC Biochemistry & Molecular Biology; Cell Biology
GA 651QA
UT WOS:000281941000018
PM 20705495
ER
PT J
AU Noh, JH
Nikiforov, M
Kalinin, SV
Vertegel, AA
Rack, PD
AF Noh, Joo Hyon
Nikiforov, Maxim
Kalinin, Sergei V.
Vertegel, Alexey A.
Rack, Philip D.
TI Nanofabrication of insulated scanning probes for electromechanical
imaging in liquid solutions
SO NANOTECHNOLOGY
LA English
DT Article
ID ATOMIC-FORCE MICROSCOPY; ELECTROCHEMICAL MICROSCOPY; THIN-FILMS;
TUNNELING-MICROSCOPY; STRESS; TIPS; MICROELECTRODES; BIOMOLECULES;
CANTILEVERS; DEPOSITION
AB In this paper, the fabrication and electrical and electromechanical characterization of insulated scanning probes have been demonstrated in liquid solutions. The silicon cantilevers were sequentially coated with chromium and silicon dioxide, and the silicon dioxide was selectively etched at the tip apex using focused-electron-beam-induced etching (FEBIE) with XeF2. The chromium layer acted not only as the conductive path from the tip, but also as an etch-resistant layer. This insulated scanning probe fabrication process is compatible with any commercial AFM tip and can be used to easily tailor the scanning probe tip properties because FEBIE does not require lithography. The suitability of the fabricated probes is demonstrated by imaging of a standard topographical calibration grid as well as piezoresponse force microscopy (PFM) and electrical measurements in ambient and liquid environments.
C1 [Noh, Joo Hyon; Rack, Philip D.] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
[Nikiforov, Maxim; Kalinin, Sergei V.; Rack, Philip D.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
[Vertegel, Alexey A.] Clemson Univ, Dept Bioengn, Clemson, SC 29634 USA.
RP Rack, PD (reprint author), Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
EM prack@utk.edu
RI Nikiforov, Maxim/C-1965-2012; Kalinin, Sergei/I-9096-2012;
OI Kalinin, Sergei/0000-0001-5354-6152; Rack, Philip/0000-0002-9964-3254
FU NIH [RR024449]; Oak Ridge National Laboratory by the Division of
Scientific User Facilities, US Department of Energy
FX This work was supported in part by NIH grant no. RR024449. 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, US Department of Energy.
NR 36
TC 13
Z9 13
U1 1
U2 16
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 SEP 10
PY 2010
VL 21
IS 36
AR 365302
DI 10.1088/0957-4484/21/36/365302
PG 10
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Physics, Applied
SC Science & Technology - Other Topics; Materials Science; Physics
GA 638FJ
UT WOS:000280878500002
PM 20702930
ER
PT J
AU Fuchs, GD
Dobrovitski, VV
Toyli, DM
Heremans, FJ
Weis, CD
Schenkel, T
Awschalom, DD
AF Fuchs, G. D.
Dobrovitski, V. V.
Toyli, D. M.
Heremans, F. J.
Weis, C. D.
Schenkel, T.
Awschalom, D. D.
TI Excited-state spin coherence of a single nitrogen-vacancy centre in
diamond
SO NATURE PHYSICS
LA English
DT Article
AB Nitrogen-vacancy centres in diamond are a solid-state analogue of trapped atoms, with fine structure in both the ground and excited states that may be used for advanced quantum control. These centres are promising candidates for spin-based quantum information processing1-3 and magnetometry4-6 at room temperature. Knowledge of the excited-state (ES) structure and coherence is critical to evaluating the ES as a room-temperature quantum resource, for example for a fast, optically gated swap operation with a nuclear-spin memory(7). Here we report experiments that probe the ES-spin coherence of single nitrogen-vacancy centres. Using a combination of pulsed-laser excitation and nanosecond-scale microwave manipulation, we observed ES Rabi oscillations, and multipulse resonant control enabled us to study coherent ES electron/nuclear-spin interactions. To understand these processes, we developed a finite-temperature theory of ES spin dynamics that also provides a pathway towards engineering longer ES spin coherence.
C1 [Fuchs, G. D.; Toyli, D. M.; Heremans, F. J.; Awschalom, D. D.] Univ Calif Santa Barbara, Ctr Spintron & Quantum Computat, Santa Barbara, CA 93106 USA.
[Dobrovitski, V. V.] Ames Lab, Ames, IA 50011 USA.
[Dobrovitski, V. V.] Iowa State Univ, Ames, IA 50011 USA.
[Weis, C. D.; Schenkel, T.] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
RP Awschalom, DD (reprint author), Univ Calif Santa Barbara, Ctr Spintron & Quantum Computat, Santa Barbara, CA 93106 USA.
EM awsch@physics.ucsb.edu
RI Heremans, F. Joseph/D-5555-2009
FU AFOSR; ARO; DARPA; Department of Energy-Basic Energy Sciences
[DE-AC02-07CH11358]
FX We gratefully acknowledge support from the AFOSR, ARO and DARPA. Work at
the Ames Laboratory was supported by the Department of Energy-Basic
Energy Sciences under contract No DE-AC02-07CH11358.
NR 27
TC 47
Z9 47
U1 2
U2 27
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 1745-2473
J9 NAT PHYS
JI Nat. Phys.
PD SEP 10
PY 2010
VL 6
IS 9
BP 668
EP 672
DI 10.1038/NPHYS1716
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 646KX
UT WOS:000281540200014
ER
PT J
AU Norrgard, EB
Tupa, D
Dreiling, JM
Gay, TJ
AF Norrgard, E. B.
Tupa, D.
Dreiling, J. M.
Gay, T. J.
TI Electron-spin-reversal phenomenon in optically pumped rubidium
SO PHYSICAL REVIEW A
LA English
DT Article
ID ALKALI-METAL VAPOR; STORAGE-RING; POLARIZATION; TARGETS
AB We have studied the optical pumping of mixtures of Rb vapor and N(2) buffer gas by laser light tuned to the D(1) transition having a spectral width of similar to 500 MHz. The Rb densities are of the order of 10(13) cm(-3), while the buffer-gas pressures range from 0.1 to 10 torr. As the frequency of the right-hand circularly polarized laser is varied across the D(1) absorption profile, the electron spin polarization of the Rb is found to take on negative values for small negative values of pump detuning from the absorption profile center. This occurs for N(2) pressures below similar to 1 torr; at 10 torr the electron spins consistently point in the same direction as the angular momentum of the pump light. The spin-reversal effect can be understood in terms of populations of the F = 2 ((85)Rb) and F = 1 ((87)Rb) states caused by small unpolarized fractions in the pump beam and its elimination in terms of pressure broadening caused by the N(2) buffer gas. We speculate that this effect could be used for fast Rb spin modulation.
C1 [Norrgard, E. B.; Dreiling, J. M.; Gay, T. J.] Univ Nebraska, Behlen Lab Phys, Lincoln, NE 68588 USA.
[Tupa, D.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Norrgard, EB (reprint author), Univ Nebraska, Behlen Lab Phys, Lincoln, NE 68588 USA.
OI Norrgard, Eric/0000-0002-8715-4648; Tupa, Dale/0000-0002-6265-5016
FU NSF [PHY-0855629]; Los Alamos Unlimited [LA-UR 10-02789]
FX The authors acknowledge very helpful discussions with Mike Romalis and
Herman Batelaan. This work was supported by NSF Grant No. PHY-0855629
and is unclassified: Los Alamos Unlimited Release LA-UR 10-02789.
NR 18
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 1050-2947
J9 PHYS REV A
JI Phys. Rev. A
PD SEP 10
PY 2010
VL 82
IS 3
AR 033408
DI 10.1103/PhysRevA.82.033408
PG 4
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 648UL
UT WOS:000281719700008
ER
PT J
AU Chmaissem, O
Grigoraviciute, I
Yamauchi, H
Karppinen, M
Marezio, M
AF Chmaissem, O.
Grigoraviciute, I.
Yamauchi, H.
Karppinen, M.
Marezio, M.
TI Superconductivity and oxygen ordering correlations in the homologous
series of (Cu, Mo)Sr-2(Ce, Y)(s)Cu2O5+2s+delta
SO PHYSICAL REVIEW B
LA English
DT Article
ID CU-O SYSTEM; BOND-VALENCE PARAMETERS; HIGH-TEMPERATURE SUPERCONDUCTOR;
LAYERED COPPER OXIDES; CRYSTAL-STRUCTURE; T-C; BLOCK; HGBA2CUO4+DELTA;
SR2CUO3+DELTA; LANTHANIDES
AB A detailed study of the structure-property relationship is reported for the first four members of the high-T-c superconducting homologous series of (Cu,Mo)Sr-2(Ce, Y)(s)Cu2O5+2s+delta [(Cu, Mo)-12s2]. In this series, the adjacent CuO2 planes are separated by a single Y-cation layer for s=1 and a fluorite-type (Ce, Y)-[O-2-(Ce, Y)](s-1) layer block for s >= 2. Even though this series may be considered a conventional homologous series from the chemical point of view, we emphasize that the structures are different from those of the Tl-, Hg-, Bi-, etc.,-based series by the fact that the inserted fluorite-type blocks are insulating. We show the formation of the higher s members via intercalation of additional Ce-O-2 layer(s) into the crystal lattices of the lower members of the series. Neutron powder-diffraction data demonstrate that the Ce/Y ratio is not constant at the different (Ce, Y) layers in the fluorite-structured block and that the innermost (Ce, Y) layer(s) are significantly Ce rich compared with the outer ones. Two independent crystallographic sites are identified for the extra oxygen atoms in the basal (Cu0.75Mo0.25)O1+delta plane with site fractional occupancies that strongly correlate with the properties of the material. A short-range ordered structure is proposed for the (Cu0.75Mo0.25)O1+delta layers that could explain both the superconducting properties of the materials and the enhanced T-c for the first member of the series.
C1 [Chmaissem, O.] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA.
[Chmaissem, O.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Grigoraviciute, I.; Yamauchi, H.; Karppinen, M.] Tokyo Inst Technol, Mat & Struct Lab, Yokohama, Kanagawa 2268503, Japan.
[Yamauchi, H.; Karppinen, M.] Aalto Univ, Inorgan Chem Lab, Sch Sci & Technol, FI-00076 Aalto, Finland.
[Marezio, M.] CNRS, CRETA, F-38042 Grenoble 9, France.
RP Chmaissem, O (reprint author), No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA.
EM chmaissem@niu.edu
RI Karppinen, Maarit/G-8035-2012
FU Tekes [1726/31/07]; Academy of Finland [116254, 126528]; Ministry of
Education, Culture, Sports, Science and Technology of Japan [ID 043145];
U.S. Department of Energy, Office of Science [DE-AC02-06CH11357]
FX This work was partly supported by Tekes under Grant No. 1726/31/07 and
the Academy of Finland under Grants No. 116254 and No. 126528. I. G.
acknowledges (Grant No. ID 043145) the Ministry of Education, Culture,
Sports, Science and Technology of Japan. At Argonne, the work was
supported by the U.S. Department of Energy, Office of Science, under
Contract No. DE-AC02-06CH11357.
NR 47
TC 13
Z9 14
U1 0
U2 15
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 SEP 10
PY 2010
VL 82
IS 10
AR 104507
DI 10.1103/PhysRevB.82.104507
PG 9
WC Physics, Condensed Matter
SC Physics
GA 648UP
UT WOS:000281720100008
ER
PT J
AU Daghofer, M
Zheng, N
Moreo, A
AF Daghofer, Maria
Zheng, Nan
Moreo, Adriana
TI Spin-polarized semiconductor induced by magnetic impurities in graphene
SO PHYSICAL REVIEW B
LA English
DT Article
ID FERMI-LIQUID; GRAPHITE
AB The effective magnetic coupling between magnetic impurities adsorbed on graphene, which is mediated by the itinerant graphene electrons, and its impact on the electrons' spectral density are studied. The magnetic interaction breaks the symmetry between the sublattices, leading to antiferromagnetic order, and a gap for the itinerant electrons develops. Random doping produces a semiconductor but if all or most of the impurities are localized in the same sublattice the spin degeneracy can be lifted and a spin-polarized semiconductor induced.
C1 [Daghofer, Maria; Zheng, Nan; Moreo, Adriana] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
[Daghofer, Maria; Zheng, Nan; Moreo, Adriana] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Daghofer, Maria] IFW Dresden, D-01171 Dresden, Germany.
[Zheng, Nan] Coll William & Mary, Dept Comp Sci, Williamsburg, VA 23187 USA.
RP Daghofer, M (reprint author), Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
EM m.daghofer@ifw-dresden.de
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. DOE; DFG
FX This work was supported by the National Science Foundation under Grant
No. DMR-0706020, the Division of Materials Sciences and Engineering,
Office of Basic Energy Sciences, U.S. DOE, and the DFG under the
Emmy-Noether program.
NR 37
TC 10
Z9 10
U1 1
U2 9
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 SEP 10
PY 2010
VL 82
IS 12
AR 121405
DI 10.1103/PhysRevB.82.121405
PG 4
WC Physics, Condensed Matter
SC Physics
GA 648VU
UT WOS:000281723300002
ER
PT J
AU Han, Y
Liu, DJ
AF Han, Yong
Liu, Da-Jiang
TI Shell structure and phase relations in electronic properties of metal
nanowires from an electron-gas model
SO PHYSICAL REVIEW B
LA English
DT Article
ID STABILIZED JELLIUM MODEL; LIQUID-DROP MODEL; SUPERSHELL STRUCTURE; WORK
FUNCTION; CLUSTERS; CONDUCTANCE; PHYSICS; FORCE; NANOCOHESION; ENERGIES
AB The electronic and dynamic properties of metal nanowires are analyzed by using a minimal electron-gas model (EGM), in which the nanowire is treated as a close system with variable Fermi energy as a function of nanowire radius. We show that the planar surface energy and the curvature energy from the EGM are reasonably consistent with those from previous stabilized-jellium-model calculations, especially for metals with low electron densities. The EGM shell structure due to the fillings of quantum-well subbands is similar to that from the stabilized jellium model. The crossings between subbands and Fermi energy level for the metal nanowire correspond to cusps on the chemical-potential curve versus nanowire radius, but inflection points on the surface-free-energy curve versus the radius, as in the case of metal nanofilms. We also find an oscillatory variation in electron density versus radius at the nanowire center with a global oscillation period which approximately equals half Fermi wavelength. Wire string tension, average binding energy, and thermodynamic stability from the EGM are in good agreement with the data from previous first-principles density-functional theory calculations. We also compare our model with those from previous reported free-electron models, in which the nanowire is treated as an open system with a constant Fermi energy. We demonstrate that the fundamental thermodynamic properties depend sensitively on the way that the potential wall is constructed in the models.
C1 [Han, Yong] Iowa State Univ, Inst Phys Res & Technol, Ames, IA 50011 USA.
[Liu, Da-Jiang] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA.
RP Han, Y (reprint author), Iowa State Univ, Inst Phys Res & Technol, Ames, IA 50011 USA.
EM octavian2009@gmail.com
RI Han, Yong/F-5701-2012
OI Han, Yong/0000-0001-5404-0911
FU NSF [CHE-0809472]; Division of Chemical Sciences of the U.S. DOE-BES;
U.S. DOE by Iowa State University [DE-AC02-07CH11358]
FX Y.H. was supported for this work by NSF under Grant No. CHE-0809472.
D.J.L. was supported by the Division of Chemical Sciences of the U.S.
DOE-BES. Computational supports at NERSC and TeraGrid were provided by
U.S. DOE and NSF, respectively. We thank James W. Evans for a critical
reading of the manuscript. We are also grateful to C.A. Stafford, Frank
Kassubek, and Jerome Burki, as well as Daning Shi, for sharing their
data. The work was performed at Ames Laboratory which is operated for
the U.S. DOE by Iowa State University under Contract No.
DE-AC02-07CH11358.
NR 43
TC 3
Z9 3
U1 1
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 SEP 10
PY 2010
VL 82
IS 12
AR 125420
DI 10.1103/PhysRevB.82.125420
PG 9
WC Physics, Condensed Matter
SC Physics
GA 648VU
UT WOS:000281723300008
ER
PT J
AU Wang, LW
AF Wang, Lin-Wang
TI Relationship between the random-phase approximation ground-state total
energy and GW quasiparticle energy
SO PHYSICAL REVIEW B
LA English
DT Article
ID DENSITY-FUNCTIONAL THEORY; ELECTRON-GAS; EXACT EXCHANGE; SOLIDS
AB A connection between the random-phase-approximation (RPA) total energy E(RPA) and the GW quasiparticle energy (is an element of)GW has been pointed out. More specifically we show that: delta E(RPA)(N)/delta N=is an element of(GW), where N is the total number of electron. The variational property of the RPA total energy is also discussed and the variational equations for the orbital wave functions are derived. We argue that the RPA formalism is a method which can provide both accurate ground-state energies and single quasiparticle energies.
C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Res Div, Berkeley, CA 94720 USA.
RP Wang, LW (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Res Div, Berkeley, CA 94720 USA.
FU U.S. Department of Energy BES/SC [DE-AC02-05CH11231]
FX This work has been supported by the U.S. Department of Energy BES/SC
under Contract No. DE-AC02-05CH11231.
NR 31
TC 8
Z9 8
U1 1
U2 5
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 SEP 10
PY 2010
VL 82
IS 11
AR 115111
DI 10.1103/PhysRevB.82.115111
PG 5
WC Physics, Condensed Matter
SC Physics
GA 648VS
UT WOS:000281723100003
ER
PT J
AU Hwang, JK
Ramayya, AV
Hamilton, JH
Liu, SH
Brewer, NT
Luo, YX
Rasmussen, JO
Zhu, SJ
Donangelo, R
AF Hwang, J. K.
Ramayya, A. V.
Hamilton, J. H.
Liu, S. H.
Brewer, N. T.
Luo, Y. X.
Rasmussen, J. O.
Zhu, S. J.
Donangelo, R.
TI High spin states in Pr-151,Pr-153, Sm-157, and Kr-93
SO PHYSICAL REVIEW C
LA English
DT Article
ID OCTUPOLE CORRELATIONS; SPONTANEOUS FISSION; NUCLEI; TRANSITIONS; BAND;
ISOTOPES; SHAPES; ND-146; DECAY
AB High spin states are observed for the first time in the neutron-rich nuclei Pr-151,Pr-153, Sm-157, and Kr-93 from the spontaneous fission of Cf-252. Twenty new transitions in Pr-151, twelve in Pr-153, five in Sm-157, and four in Kr-93 were identified by using x-ray(Pr/Sm)-gamma-gamma and gamma-gamma-gamma triple coincidences. From the measured total internal conversion coefficients alpha(T) of four low-energy transitions in Pr-151,Pr-153, we determine that two bands in each nucleus have opposite parity. The interlacing E1 transitions between the bands suggest a form of parity doubling in Pr-151,Pr-153. New bands in Sm-157 and Kr-93 are reported. The half-life of the 354.8 keV state in Kr-93 is measured to be 10(2)ns.
C1 [Hwang, J. K.; Ramayya, A. V.; Hamilton, J. H.; Liu, S. H.; Brewer, N. T.; Luo, Y. X.; Zhu, S. J.] Vanderbilt Univ, Dept Phys, Nashville, TN 37235 USA.
[Luo, Y. X.; Rasmussen, J. O.] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
[Zhu, S. J.] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China.
[Donangelo, R.] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, Brazil.
[Donangelo, R.] Fac Ingn, Inst Fis, Montevideo 11300, Uruguay.
RP Hwang, JK (reprint author), Vanderbilt Univ, Dept Phys, Nashville, TN 37235 USA.
RI Sistemas Complexos, Inct/J-8597-2013;
OI Hwang, Jae-Kwang/0000-0002-4100-3473
FU US Department of Energy [DE-FG05-88ER40407, DE-AC03-76SF00098]; National
Natural Science Foundation of China [10975082]; Major State Basic
Research Development Program [2007CB815005]; PEDECIBA (Uruguay); CNPq
(Brazil)
FX The work at Vanderbilt University and Lawrence Berkeley National
Laboratory are supported by the US Department of Energy under Grant No.
DE-FG05-88ER40407 and Contract No. DE-AC03-76SF00098. The work at
Tsinghua University was supported by the National Natural Science
Foundation of China under Grant No. 10975082 and the Major State Basic
Research Development Program 2007CB815005. R.D. acknowledges partial
financial support from PEDECIBA (Uruguay) and CNPq (Brazil).
NR 31
TC 10
Z9 10
U1 0
U2 3
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 SEP 10
PY 2010
VL 82
IS 3
AR 034308
DI 10.1103/PhysRevC.82.034308
PG 9
WC Physics, Nuclear
SC Physics
GA 649BV
UT WOS:000281742200004
ER
PT J
AU Bauer, CW
Dunn, ND
Hornig, A
AF Bauer, Christian W.
Dunn, Nicholas Daniel
Hornig, Andrew
TI Factorization of boosted multijet processes for threshold resummation
SO PHYSICAL REVIEW D
LA English
DT Article
ID PRODUCTION CROSS-SECTION; QCD HARD SCATTERING; B-MESON DECAYS;
END-POINT; NORMALIZATION; OBSERVABLES; JETS
AB Explicit applications of factorization theorems for processes at hadron colliders near the hadronic end point have largely focused on simple final states with either no jets (e.g., Drell-Yan) or one inclusive jet (e. g., deep-inelastic scattering and prompt photon production). Factorization for the former type of process gives rise to a soft function that depends on timelike momenta, whereas the soft function for the latter type depends on null momenta. We derive in soft-collinear effective theory a factorization theorem that allows for an arbitrary number of jets, where the jets are defined with respect to a jet algorithm, together with any number of nonstrongly interacting particles. We find the soft function in general depends on the null components of the soft momenta inside the jets and on a timelike component of the soft momentum outside of the jets. This generalizes and interpolates between the soft functions for the cases of no jets and one inclusive jet. We verify consistency of our factorization theorem to O(alpha(s)) for any number of jets. While in this paper we demonstrate consistency only near the hadronic end point, we keep the kinematics general enough (in particular allowing for nonzero boost) to allow for an extension to partonic threshold resummation away from the hadronic end point.
C1 [Bauer, Christian W.; Dunn, Nicholas Daniel; Hornig, Andrew] Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
RP Bauer, CW (reprint author), Univ Calif Berkeley, Ernest Orlando Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
FU Office of Science, and Offices of High Energy and Nuclear Physics of the
U.S. Department of Energy [DE-AC02-05CH11231]; NSF [PHY-0705682]
FX This work was supported by the Director, Office of Science, and Offices
of High Energy and Nuclear Physics of the U.S. Department of Energy
under the Contract No. DE-AC02-05CH11231. A.H. also acknowledges support
from an NSF Grant No. PHY-0705682.
NR 69
TC 10
Z9 10
U1 0
U2 0
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 SEP 10
PY 2010
VL 82
IS 5
AR 054012
DI 10.1103/PhysRevD.82.054012
PG 14
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 649BO
UT WOS:000281741400004
ER
PT J
AU Sanchez, PD
Lees, JP
Poireau, V
Prencipe, E
Tisserand, V
Tico, JG
Grauges, E
Martinelli, M
Palano, A
Pappagallo, M
Eigen, G
Stugu, B
Sun, L
Battaglia, M
Brown, DN
Hooberman, B
Kerth, LT
Kolomensky, YG
Lynch, G
Osipenkov, IL
Tanabe, T
Hawkes, CM
Watson, AT
Koch, H
Schroeder, T
Asgeirsson, DJ
Hearty, C
Mattison, TS
McKenna, JA
Khan, A
Randle-Conde, A
Blinov, VE
Buzykaev, AR
Druzhinin, VP
Golubev, VB
Onuchin, AP
Serednyakov, SI
Skovpen, YI
Solodov, EP
Todyshev, KY
Yushkov, AN
Bondioli, M
Curry, S
Kirkby, D
Lankford, AJ
Mandelkern, M
Martin, EC
Stoker, DP
Atmacan, H
Gary, JW
Liu, F
Long, O
Vitug, GM
Campagnari, C
Hong, TM
Kovalskyi, D
Richman, JD
Eisner, AM
Heusch, CA
Kroseberg, J
Lockman, WS
Martinez, AJ
Schalk, T
Schumm, BA
Seiden, A
Winstrom, LO
Cheng, CH
Doll, DA
Echenard, B
Hitlin, DG
Ongmongkolkul, P
Porter, FC
Rakitin, AY
Andreassen, R
Dubrovin, MS
Mancinelli, G
Meadows, BT
Sokoloff, MD
Bloom, PC
Ford, WT
Gaz, A
Hirschauer, JF
Nagel, M
Nauenberg, U
Smith, JG
Wagner, SR
Ayad, R
Toki, WH
Karbach, TM
Merkel, J
Petzold, A
Spaan, B
Wacker, K
Kobel, MJ
Schubert, KR
Schwierz, R
Bernard, D
Verderi, M
Clark, PJ
Playfer, S
Watson, JE
Andreotti, M
Bettoni, D
Bozzi, C
Calabrese, R
Cecchi, A
Cibinetto, G
Fioravanti, E
Franchini, P
Luppi, E
Munerato, M
Negrini, M
Petrella, A
Piemontese, L
Baldini-Ferroli, R
Calcaterra, A
de Sangro, R
Finocchiaro, G
Nicolaci, M
Pacetti, S
Patteri, P
Peruzzi, IM
Piccolo, M
Rama, M
Zallo, A
Contri, R
Guido, E
Lo Vetere, M
Monge, MR
Passaggio, S
Patrignani, C
Robutti, E
Tosi, S
Bhuyan, B
Lee, CL
Morii, M
Adametz, A
Marks, J
Schenk, S
Uwer, U
Bernlochner, FU
Ebert, M
Lacker, HM
Lueck, T
Volk, A
Dauncey, PD
Tibbetts, M
Behera, PK
Mallik, U
Chen, C
Cochran, J
Crawley, HB
Dong, L
Meyer, WT
Prell, S
Rosenberg, EI
Rubin, AE
Gao, YY
Gritsan, AV
Guo, ZJ
Arnaud, N
Davier, M
Derkach, D
da Costa, JF
Grosdidier, G
Le Diberder, F
Lutz, AM
Malaescu, B
Perez, A
Roudeau, P
Schune, MH
Serrano, J
Sordini, V
Stocchi, A
Wang, L
Wormser, G
Lange, DJ
Wright, DM
Bingham, I
Burke, JP
Chavez, CA
Coleman, JP
Fry, JR
Gabathuler, E
Gamet, R
Hutchcroft, DE
Payne, DJ
Touramanis, C
Bevan, AJ
Di Lodovico, F
Sacco, R
Sigamani, M
Cowan, G
Paramesvaran, S
Wren, AC
Brown, DN
Davis, CL
Denig, AG
Fritsch, M
Gradl, W
Hafner, A
Alwyn, KE
Bailey, D
Barlow, RJ
Jackson, G
Lafferty, GD
West, TJ
Anderson, J
Cenci, R
Jawahery, A
Roberts, DA
Simi, G
Tuggle, JM
Dallapiccola, C
Salvati, E
Cowan, R
Dujmic, D
Fisher, PH
Sciolla, G
Zhao, M
Lindemann, D
Patel, PM
Robertson, SH
Schram, M
Biassoni, P
Lazzaro, A
Lombardo, V
Palombo, F
Stracka, S
Cremaldi, L
Godang, R
Kroeger, R
Sonnek, P
Summers, DJ
Nguyen, X
Simard, M
Taras, P
De Nardo, G
Monorchio, D
Onorato, G
Sciacca, C
Raven, G
Snoek, HL
Jessop, CP
Knoepfel, KJ
LoSecco, JM
Wang, WF
Corwin, LA
Honscheid, K
Kass, R
Morris, JP
Rahimi, AM
Blount, NL
Brau, J
Frey, R
Igonkina, O
Kolb, JA
Rahmat, R
Sinev, NB
Strom, D
Strube, J
Torrence, E
Castelli, G
Feltresi, E
Gagliardi, N
Margoni, M
Morandin, M
Posocco, M
Rotondo, M
Simonetto, F
Stroili, R
Ben-Haim, E
Bonneaud, GR
Briand, H
Calderini, G
Chauveau, J
Hamon, O
Leruste, P
Marchiori, G
Ocariz, J
Prendki, J
Sitt, S
Biasini, M
Manoni, E
Angelini, C
Batignani, G
Bettarini, S
Carpinelli, M
Casarosa, G
Cervelli, A
Forti, F
Giorgi, MA
Lusiani, A
Neri, N
Paoloni, E
Rizzo, G
Walsh, JJ
Pegna, DL
Lu, C
Olsen, J
Smith, AJS
Telnov, AV
Anulli, F
Baracchini, E
Cavoto, G
Faccini, R
Ferrarotto, F
Ferroni, F
Gaspero, M
Gioi, LL
Mazzoni, MA
Piredda, G
Renga, F
Hartmann, T
Leddig, T
Schroder, H
Waldi, R
Adye, T
Franek, B
Olaiya, EO
Wilson, FF
Emery, S
de Monchenault, GH
Vasseur, G
Yeche, C
Zito, M
Allen, MT
Aston, D
Bard, DJ
Bartoldus, R
Benitez, JF
Cartaro, C
Convery, MR
Dorfan, J
Dubois-Felsmann, GP
Dunwoodie, W
Field, RC
Sevilla, MF
Fulsom, BG
Gabareen, AM
Graham, MT
Grenier, P
Hast, C
Innes, WR
Kelsey, MH
Kim, H
Kim, P
Kocian, ML
Leith, DWGS
Li, S
Lindquist, B
Luitz, S
Luth, V
Lynch, HL
MacFarlane, DB
Marsiske, H
Muller, DR
Neal, H
Nelson, S
O'Grady, CP
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Schilling, CJ
Schwitters, RF
Wray, BC
Izen, JM
Lou, XC
Bianchi, F
Gamba, D
Pelliccioni, M
Bomben, M
Lanceri, L
Vitale, L
Lopez-March, N
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Roney, JM
Sobie, RJ
Gershon, TJ
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Puccio, EMT
Band, HR
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Dasu, S
Flood, KT
Pan, Y
Prepost, R
Vuosalo, CO
Wu, SL
AF Sanchez, P. del Amo
Lees, J. P.
Poireau, V.
Prencipe, E.
Tisserand, V.
Tico, J. Garra
Grauges, E.
Martinelli, M.
Palano, A.
Pappagallo, M.
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Stugu, B.
Sun, L.
Battaglia, M.
Brown, D. N.
Hooberman, B.
Kerth, L. T.
Kolomensky, Yu. G.
Lynch, G.
Osipenkov, I. L.
Tanabe, T.
Hawkes, C. M.
Watson, A. T.
Koch, H.
Schroeder, T.
Asgeirsson, D. J.
Hearty, C.
Mattison, T. S.
McKenna, J. A.
Khan, A.
Randle-Conde, A.
Blinov, V. E.
Buzykaev, A. R.
Druzhinin, V. P.
Golubev, V. B.
Onuchin, A. P.
Serednyakov, S. I.
Skovpen, Yu. I.
Solodov, E. P.
Todyshev, K. Yu.
Yushkov, A. N.
Bondioli, M.
Curry, S.
Kirkby, D.
Lankford, A. J.
Mandelkern, M.
Martin, E. C.
Stoker, D. P.
Atmacan, H.
Gary, J. W.
Liu, F.
Long, O.
Vitug, G. M.
Campagnari, C.
Hong, T. M.
Kovalskyi, D.
Richman, J. D.
Eisner, A. M.
Heusch, C. A.
Kroseberg, J.
Lockman, W. S.
Martinez, A. J.
Schalk, T.
Schumm, B. A.
Seiden, A.
Winstrom, L. O.
Cheng, C. H.
Doll, D. A.
Echenard, B.
Hitlin, D. G.
Ongmongkolkul, P.
Porter, F. C.
Rakitin, A. Y.
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Dubrovin, M. S.
Mancinelli, G.
Meadows, B. T.
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Hirschauer, J. F.
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Petzold, A.
Spaan, B.
Wacker, K.
Kobel, M. J.
Schubert, K. R.
Schwierz, R.
Bernard, D.
Verderi, M.
Clark, P. J.
Playfer, S.
Watson, J. E.
Andreotti, M.
Bettoni, D.
Bozzi, C.
Calabrese, R.
Cecchi, A.
Cibinetto, G.
Fioravanti, E.
Franchini, P.
Luppi, E.
Munerato, M.
Negrini, M.
Petrella, A.
Piemontese, L.
Baldini-Ferroli, R.
Calcaterra, A.
de Sangro, R.
Finocchiaro, G.
Nicolaci, M.
Pacetti, S.
Patteri, P.
Peruzzi, I. M.
Piccolo, M.
Rama, M.
Zallo, A.
Contri, R.
Guido, E.
Lo Vetere, M.
Monge, M. R.
Passaggio, S.
Patrignani, C.
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Tosi, S.
Bhuyan, B.
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Marks, J.
Schenk, S.
Uwer, U.
Bernlochner, F. U.
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Lacker, H. M.
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Dauncey, P. D.
Tibbetts, M.
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Mallik, U.
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Payne, D. J.
Touramanis, C.
Bevan, A. J.
Di Lodovico, F.
Sacco, R.
Sigamani, M.
Cowan, G.
Paramesvaran, S.
Wren, A. C.
Brown, D. N.
Davis, C. L.
Denig, A. G.
Fritsch, M.
Gradl, W.
Hafner, A.
Alwyn, K. E.
Bailey, D.
Barlow, R. J.
Jackson, G.
Lafferty, G. D.
West, T. J.
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Jawahery, A.
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Blount, N. L.
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Santoro, V.
Schindler, R. H.
Schwiening, J.
Snyder, A.
Su, D.
Sullivan, M. K.
Sun, S.
Suzuki, K.
Thompson, J. M.
Va'vra, J.
Wagner, A. P.
Weaver, M.
West, C. A.
Wisniewski, W. J.
Wittgen, M.
Wright, D. H.
Wulsin, H. W.
Yarritu, A. K.
Young, C. C.
Ziegler, V.
Chen, R.
Park, W.
Purohit, M. V.
White, R. M.
Wilson, J. R.
Sekula, S. J.
Bellis, M.
Burchat, P. R.
Edwards, A. J.
Miyashita, T. S.
Ahmed, S.
Alam, M. S.
Ernst, J. A.
Pan, B.
Saeed, M. A.
Zain, S. B.
Guttman, N.
Soffer, A.
Lund, P.
Spanier, S. M.
Eckmann, R.
Ritchie, J. L.
Ruland, A. M.
Schilling, C. J.
Schwitters, R. F.
Wray, B. C.
Izen, J. M.
Lou, X. C.
Bianchi, F.
Gamba, D.
Pelliccioni, M.
Bomben, M.
Lanceri, L.
Vitale, L.
Lopez-March, N.
Martinez-Vidal, F.
Milanes, D. A.
Oyanguren, A.
Albert, J.
Banerjee, Sw.
Choi, H. H. F.
Hamano, K.
King, G. J.
Kowalewski, R.
Lewczuk, M. J.
Nugent, I. M.
Roney, J. M.
Sobie, R. J.
Gershon, T. J.
Harrison, P. F.
Ilic, J.
Latham, T. E.
Puccio, E. M. T.
Band, H. R.
Chen, X.
Dasu, S.
Flood, K. T.
Pan, Y.
Prepost, R.
Vuosalo, C. O.
Wu, S. L.
CA BaBar Collaboration
TI Study of B -> X gamma decays and determination of vertical bar V-td/V-ts
vertical bar
SO PHYSICAL REVIEW D
LA English
DT Article
ID SUPERSYMMETRY; MODEL
AB Using a sample of 471 x 10(6) B (B) over bar events collected with the BABAR detector, we study the sum of seven exclusive final states B -> X-s(d)gamma, where X-s(d) is a strange (nonstrange) hadronic system with a mass of up to 2.0 GeV/c(2). After correcting for unobserved decay modes, we obtain a branching fraction for b -> d gamma of (9.2 +/- 2.0(stat) +/- 2.3(syst) x 10(-6) in this mass range, and a branching fraction for b -> s gamma of (23.0 +/- 0.8(stat) +/- 3.0(syst) x 3.0(syst) x 10(-5) in the same mass range. We find B(b -> d gamma)/B(b -> s gamma) = 0.040 +/- 0.009(stat) +/- 0.010(syst), from which we determine vertical bar Vtd/Vts vertical bar = 0.199 +/- 0.022(stat) +/- 0.024(syst) +/- 0.002(th).
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[Biasini, M.; Manoni, E.] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy.
[Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Lusiani, A.; Neri, N.; Paoloni, E.; Rizzo, G.; Walsh, J. J.] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy.
[Angelini, C.; Batignani, G.; Bettarini, S.; Carpinelli, M.; Casarosa, G.; Cervelli, A.; Forti, F.; Giorgi, M. A.; Neri, N.; Paoloni, E.; Rizzo, G.] Univ Pisa, Dipartimento Fis, I-56127 Pisa, Italy.
[Lusiani, A.] Scuola Normale Super Pisa, I-56127 Pisa, Italy.
[Pegna, D. Lopes; Lu, C.; Olsen, J.; Smith, A. J. S.; Telnov, A. V.] Princeton Univ, Princeton, NJ 08544 USA.
[Anulli, F.; Baracchini, E.; Cavoto, G.; Faccini, R.; Ferrarotto, F.; Ferroni, F.; Gaspero, M.; Gioi, L. Li; Mazzoni, M. A.; Piredda, G.; Renga, F.] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy.
[Baracchini, E.; Faccini, R.; Ferroni, F.; Gaspero, M.; Renga, F.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy.
[Hartmann, T.; Leddig, T.; Schroeder, H.; Waldi, R.] Univ Rostock, D-18051 Rostock, Germany.
[Adye, T.; Franek, B.; Olaiya, E. O.; Wilson, F. F.] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England.
[Emery, S.; de Monchenault, G. Hamel; Vasseur, G.; Yeche, Ch.; Zito, M.] Ctr Saclay, CEA, SPP, F-91191 Gif Sur Yvette, France.
[Allen, M. T.; Aston, D.; Bard, D. J.; Bartoldus, R.; Benitez, J. F.; Cartaro, C.; Convery, M. R.; Dorfan, J.; Dubois-Felsmann, G. P.; Dunwoodie, W.; Field, R. C.; Sevilla, M. Franco; Fulsom, B. G.; Gabareen, A. M.; Graham, M. T.; Grenier, P.; Hast, C.; Innes, W. R.; Kelsey, M. H.; Kim, H.; Kim, P.; Kocian, M. L.; Leith, D. W. G. S.; Li, S.; Lindquist, B.; Luitz, S.; Luth, V.; Lynch, H. L.; MacFarlane, D. B.; Marsiske, H.; Muller, D. R.; Neal, H.; Nelson, S.; O'Grady, C. P.; Ofte, I.; Perl, M.; Pulliam, T.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Santoro, V.; Schindler, R. H.; Schwiening, J.; Snyder, A.; Su, D.; Sullivan, M. K.; Sun, S.; Suzuki, K.; Thompson, J. M.; Va'vra, J.; Wagner, A. P.; Weaver, M.; West, C. A.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Wulsin, H. W.; Yarritu, A. K.; Young, C. C.; Ziegler, V.] SLAC Natl Accelerator Lab, Stanford, CA 94309 USA.
[Chen, R.; Park, W.; Purohit, M. V.; White, R. M.; Wilson, J. R.] Univ S Carolina, Columbia, SC 29208 USA.
[Sekula, S. J.] So Methodist Univ, Dallas, TX 75275 USA.
[Bellis, M.; Burchat, P. R.; Edwards, A. J.; Miyashita, T. S.] Stanford Univ, Stanford, CA 94305 USA.
[Ahmed, S.; Alam, M. S.; Ernst, J. A.; Pan, B.; Saeed, M. A.; Zain, S. B.] SUNY Albany, Albany, NY 12222 USA.
[Guttman, N.; Soffer, A.] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel.
[Lund, P.; Spanier, S. M.] Univ Tennessee, Knoxville, TN 37996 USA.
[Eckmann, R.; Ritchie, J. L.; Ruland, A. M.; Schilling, C. J.; Schwitters, R. F.; Wray, B. C.] Univ Texas Austin, Austin, TX 78712 USA.
[Izen, J. M.; Lou, X. C.] Univ Texas Dallas, Richardson, TX 75083 USA.
[Bianchi, F.; Gamba, D.; Pelliccioni, M.] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy.
[Bianchi, F.; Gamba, D.; Pelliccioni, M.] Univ Turin, Dipartimento Fis Sperimentale, I-10125 Turin, Italy.
[Bomben, M.; Lanceri, L.; Vitale, L.] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy.
[Bomben, M.; Lanceri, L.; Vitale, L.] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy.
[Lopez-March, N.; Martinez-Vidal, F.; Milanes, D. A.; Oyanguren, A.] Univ Valencia, CSIC, IFIC, E-46071 Valencia, Spain.
[Albert, J.; Banerjee, Sw.; Choi, H. H. F.; Hamano, K.; King, G. J.; Kowalewski, R.; Lewczuk, M. J.; Nugent, I. M.; Roney, J. M.; Sobie, R. J.] Univ Victoria, Victoria, BC V8W 3P6, Canada.
[Gershon, T. J.; Harrison, P. F.; Ilic, J.; Latham, T. E.; Puccio, E. M. T.] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England.
[Band, H. R.; Chen, X.; Dasu, S.; Flood, K. T.; Pan, Y.; Prepost, R.; Vuosalo, C. O.; Wu, S. L.] Univ Wisconsin, Madison, WI 53706 USA.
RP Sanchez, PD (reprint author), Univ Savoie, LAPP, CNRS, IN2P3, F-74941 Annecy Le Vieux, France.
RI Martinez Vidal, F*/L-7563-2014; Kolomensky, Yury/I-3510-2015; Lo Vetere,
Maurizio/J-5049-2012; Lusiani, Alberto/N-2976-2015; Morandin,
Mauro/A-3308-2016; Lusiani, Alberto/A-3329-2016; Stracka,
Simone/M-3931-2015; Di Lodovico, Francesca/L-9109-2016; Pappagallo,
Marco/R-3305-2016; Calcaterra, Alessandro/P-5260-2015; Frey,
Raymond/E-2830-2016; Oyanguren, Arantza/K-6454-2014; Luppi,
Eleonora/A-4902-2015; White, Ryan/E-2979-2015; Calabrese,
Roberto/G-4405-2015; Neri, Nicola/G-3991-2012; Forti,
Francesco/H-3035-2011; Rotondo, Marcello/I-6043-2012; de Sangro,
Riccardo/J-2901-2012; Saeed, Mohammad Alam/J-7455-2012; Negrini,
Matteo/C-8906-2014; Patrignani, Claudia/C-5223-2009; Monge, Maria
Roberta/G-9127-2012; dong, liaoyuan/A-5093-2015; Rizzo,
Giuliana/A-8516-2015;
OI Martinez Vidal, F*/0000-0001-6841-6035; Kolomensky,
Yury/0000-0001-8496-9975; Lo Vetere, Maurizio/0000-0002-6520-4480;
Lusiani, Alberto/0000-0002-6876-3288; Morandin,
Mauro/0000-0003-4708-4240; Lusiani, Alberto/0000-0002-6876-3288;
Stracka, Simone/0000-0003-0013-4714; Di Lodovico,
Francesca/0000-0003-3952-2175; Pappagallo, Marco/0000-0001-7601-5602;
Calcaterra, Alessandro/0000-0003-2670-4826; Frey,
Raymond/0000-0003-0341-2636; Paoloni, Eugenio/0000-0001-5969-8712;
Oyanguren, Arantza/0000-0002-8240-7300; Luppi,
Eleonora/0000-0002-1072-5633; White, Ryan/0000-0003-3589-5900;
Calabrese, Roberto/0000-0002-1354-5400; Neri,
Nicola/0000-0002-6106-3756; Forti, Francesco/0000-0001-6535-7965;
Rotondo, Marcello/0000-0001-5704-6163; de Sangro,
Riccardo/0000-0002-3808-5455; Saeed, Mohammad Alam/0000-0002-3529-9255;
Negrini, Matteo/0000-0003-0101-6963; Patrignani,
Claudia/0000-0002-5882-1747; Monge, Maria Roberta/0000-0003-1633-3195;
Cibinetto, Gianluigi/0000-0002-3491-6231; dong,
liaoyuan/0000-0002-4773-5050; Pacetti, Simone/0000-0002-6385-3508;
Rizzo, Giuliana/0000-0003-1788-2866; Faccini,
Riccardo/0000-0003-2613-5141; Bellis, Matthew/0000-0002-6353-6043
FU DOE (USA); NSF (USA); NSERC (Canada); CEA (France); CNRS-IN2P3 (France);
BMBF (Germany); DFG (Germany); INFN (Italy); FOM (The Netherlands); NFR
(Norway); MES (Russia); MICIIN (Spain); STFC (United Kingdom); Marie
Curie EIF (European Union); A. P. Sloan Foundation (USA); Binational
Science Foundation (USA-Israel)
FX We are grateful for the excellent luminosity and machine conditions
provided by our PEP-II colleagues, and for the substantial dedicated
effort from the computing organizations that support BABAR. The
collaborating institutions wish to thank SLAC for its support and kind
hospitality. This work is supported by DOE and NSF (USA), NSERC
(Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN
(Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MICIIN
(Spain), STFC (United Kingdom) STFC (United Kingdom). Individuals have
received support from the Marie Curie EIF (European Union), the A. P.
Sloan Foundation (USA) and the Binational Science Foundation
(USA-Israel).
NR 22
TC 24
Z9 24
U1 0
U2 7
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 SEP 10
PY 2010
VL 82
IS 5
AR 051101
DI 10.1103/PhysRevD.82.051101
PG 8
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 649BO
UT WOS:000281741400001
ER
PT J
AU Amendt, P
Landen, OL
Robey, HF
AF Amendt, Peter
Landen, O. L.
Robey, H. F.
TI Plasma Barodiffusion in Inertial-Confinement-Fusion Implosions:
Application to Observed Yield Anomalies in Thermonuclear Fuel Mixtures
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID NATIONAL IGNITION FACILITY; SHOCK-WAVE; TARGETS
AB The observation of large, self-generated electric fields (>= 10(9) V/m) in imploding capsules using proton radiography has been reported [C. K. Li et al., Phys. Rev. Lett. 100, 225001 (2008)]. A model of pressure gradient-driven diffusion in a plasma with self-generated electric fields is developed and applied to reported neutron yield deficits for equimolar D(3)He [J. R. Rygg et al., Phys. Plasmas 13, 052702 (2006)] and (DT)(3)He [H. W. Herrmann et al., Phys. Plasmas 16, 056312 (2009)] fuel mixtures and Ar-doped deuterium fuels [J. D. Lindl et al., Phys. Plasmas 11, 339 (2004)]. The observed anomalies are explained as a mild loss of deuterium nuclei near capsule center arising from shock-driven diffusion in the high-field limit.
C1 [Amendt, Peter; Landen, O. L.; Robey, H. F.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
RP Amendt, P (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
FU [LDRD-08-ERD-062]
FX We are grateful to an anonymous referee for numerous and useful
suggestions. Prepared by LLNL under Contract No. DE-AC52-07NA27344 and
supported by LDRD-08-ERD-062.
NR 15
TC 40
Z9 40
U1 1
U2 5
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 SEP 10
PY 2010
VL 105
IS 11
AR 115005
DI 10.1103/PhysRevLett.105.115005
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 703AJ
UT WOS:000285939000004
PM 20867580
ER
PT J
AU Haurwitz, RE
Jinek, M
Wiedenheft, B
Zhou, KH
Doudna, JA
AF Haurwitz, Rachel E.
Jinek, Martin
Wiedenheft, Blake
Zhou, Kaihong
Doudna, Jennifer A.
TI Sequence- and Structure-Specific RNA Processing by a CRISPR Endonuclease
SO SCIENCE
LA English
DT Article
ID COMPLEX; PROKARYOTES; IDENTIFICATION; DEFENSE; TRANSCRIPTION;
RECOGNITION; SULFOLOBUS; REPEATS; MOTIF; DNA
AB Many bacteria and archaea contain clustered regularly interspaced short palindromic repeats (CRISPRs) that confer resistance to invasive genetic elements. Central to this immune system is the production of CRISPR-derived RNAs (crRNAs) after transcription of the CRISPR locus. Here, we identify the endoribonuclease (Csy4) responsible for CRISPR transcript (pre-crRNA) processing in Pseudomonas aeruginosa. A 1.8 angstrom crystal structure of Csy4 bound to its cognate RNA reveals that Csy4 makes sequence-specific interactions in the major groove of the crRNA repeat stem-loop. Together with electrostatic contacts to the phosphate backbone, these enable Csy4 to bind selectively and cleave pre-crRNAs using phylogenetically conserved serine and histidine residues in the active site. The RNA recognition mechanism identified here explains sequence-and structure-specific processing by a large family of CRISPR-specific endoribonucleases.
C1 [Haurwitz, Rachel E.; Jinek, Martin; Wiedenheft, Blake; Zhou, Kaihong; Doudna, Jennifer A.] Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA.
[Wiedenheft, Blake; Zhou, Kaihong; Doudna, Jennifer A.] Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA.
[Doudna, Jennifer A.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Doudna, Jennifer A.] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
RP Doudna, JA (reprint author), Univ Calif Berkeley, Dept Mol & Cell Biol, 229 Stanley Hall, Berkeley, CA 94720 USA.
EM doudna@berkeley.edu
OI Jinek, Martin/0000-0002-7601-210X
FU U.S. NIH [5 T32 GM08295]; Human Frontier Science Program; NSF; Bill and
Melinda Gates Foundation
FX We thank W. Westphal for help with purification of Csy4 constructs; J.
van der Oost for discussion; J. Doudna Cate and members of the Doudna
laboratory for critical reading of the manuscript; and C. Ralston and J.
Holton (Beamlines 8.2.2 and 8.3.1, Advanced Light Source, Lawrence
Berkeley National Laboratory) and S. Coyle for assistance with X-ray
data collection. R.E.H. is supported by the U.S. NIH training grant 5
T32 GM08295. M.J. is supported by a Human Frontier Science Program
Long-Term Fellowship. B. W. is a Howard Hughes Medical Institute Fellow
of the Life Sciences Research Foundation. This work was supported in
part by grants from NSF and the Bill and Melinda Gates Foundation.
J.A.D. is a Howard Hughes Medical Institute Investigator. Coordinates
and structure factors for the Csy4-crRNA complex have been deposited in
the Protein Data Bank under accession codes 2xli, 2xlj, and 2xlk. The
authors have filed a related patent.
NR 23
TC 263
Z9 280
U1 14
U2 109
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 SEP 10
PY 2010
VL 329
IS 5997
BP 1355
EP 1358
DI 10.1126/science.1192272
PG 4
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 647YR
UT WOS:000281657300042
PM 20829488
ER
PT J
AU Aklujkar, M
Young, ND
Holmes, D
Chavan, M
Risso, C
Kiss, HE
Han, CS
Land, ML
Lovley, DR
AF Aklujkar, Muktak
Young, Nelson D.
Holmes, Dawn
Chavan, Milind
Risso, Carla
Kiss, Hajnalka E.
Han, Cliff S.
Land, Miriam L.
Lovley, Derek R.
TI The genome of Geobacter bemidjiensis, exemplar for the subsurface clade
of Geobacter species that predominate in Fe(III)-reducing subsurface
environments
SO BMC GENOMICS
LA English
DT Article
ID STREPTOMYCES-COELICOLOR A3(2); GLUTACONYL-COA DECARBOXYLASE; HYBRID
CLUSTER PROTEIN; ESCHERICHIA-COLI K-12; C-TYPE CYTOCHROMES;
BACILLUS-SUBTILIS; FE(III) REDUCTION; ACIDAMINOCOCCUS-FERMENTANS;
DISSIMILATORY FE(III); BIOCHEMICAL-ANALYSIS
AB Background: Geobacter species in a phylogenetic cluster known as subsurface clade 1 are often the predominant microorganisms in subsurface environments in which Fe(III) reduction is the primary electron-accepting process. Geobacter bemidjiensis, a member of this clade, was isolated from hydrocarbon-contaminated subsurface sediments in Bemidji, Minnesota, and is closely related to Geobacter species found to be abundant at other subsurface sites. This study examines whether there are significant differences in the metabolism and physiology of G. bemidjiensis compared to non-subsurface Geobacter species.
Results: Annotation of the genome sequence of G. bemidjiensis indicates several differences in metabolism compared to previously sequenced non-subsurface Geobacteraceae, which will be useful for in silico metabolic modeling of subsurface bioremediation processes involving Geobacter species. Pathways can now be predicted for the use of various carbon sources such as propionate by G. bemidjiensis. Additional metabolic capabilities such as carbon dioxide fixation and growth on glucose were predicted from the genome annotation. The presence of different dicarboxylic acid transporters and two oxaloacetate decarboxylases in G. bemidjiensis may explain its ability to grow by disproportionation of fumarate. Although benzoate is the only aromatic compound that G. bemidjiensis is known or predicted to utilize as an electron donor and carbon source, the genome suggests that this species may be able to detoxify other aromatic pollutants without degrading them. Furthermore, G. bemidjiensis is auxotrophic for 4-aminobenzoate, which makes it the first Geobacter species identified as having a vitamin requirement. Several features of the genome indicated that G. bemidjiensis has enhanced abilities to respire, detoxify and avoid oxygen.
Conclusion: Overall, the genome sequence of G. bemidjiensis offers surprising insights into the metabolism and physiology of Geobacteraceae in subsurface environments, compared to non-subsurface Geobacter species, such as the ability to disproportionate fumarate, more efficient oxidation of propionate, enhanced responses to oxygen stress, and dependence on the environment for a vitamin requirement. Therefore, an understanding of the activity of Geobacter species in the subsurface is more likely to benefit from studies of subsurface isolates such as G. bemidjiensis than from the non-subsurface model species studied so far.
C1 [Aklujkar, Muktak; Young, Nelson D.; Holmes, Dawn; Chavan, Milind; Risso, Carla; Lovley, Derek R.] Univ Massachusetts, Amherst, MA 01003 USA.
[Kiss, Hajnalka E.; Han, Cliff S.] Joint Genome Inst, Dept Energy, Walnut Creek, CA 94598 USA.
[Land, Miriam L.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA.
RP Aklujkar, M (reprint author), Univ Massachusetts, Amherst, MA 01003 USA.
EM muktak@microbio.umass.edu
RI Land, Miriam/A-6200-2011
OI Land, Miriam/0000-0001-7102-0031
FU Office of Science (Biological and Environmental Research), U.S.
Department of Energy [DE-FC02-02ER63446]; Office of Science of the U.S.
Department of Energy [DE-AC02-05CH11231]
FX We thank Mounir Izallalen for helpful discussions and P. Brown, T.
Woodard, K. Nevin, T. Brettin, C. Detter, and C. Kuske for technical
assistance. This research was supported by the Office of Science
(Biological and Environmental Research), U.S. Department of Energy
(Grant No. DE-FC02-02ER63446). The work conducted by the U.S. Department
of Energy Joint Genome Institute is supported by the Office of Science
of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231.
NR 81
TC 30
Z9 31
U1 2
U2 22
PU BIOMED CENTRAL LTD
PI LONDON
PA 236 GRAYS INN RD, FLOOR 6, LONDON WC1X 8HL, ENGLAND
SN 1471-2164
J9 BMC GENOMICS
JI BMC Genomics
PD SEP 9
PY 2010
VL 11
AR 490
DI 10.1186/1471-2164-11-490
PG 18
WC Biotechnology & Applied Microbiology; Genetics & Heredity
SC Biotechnology & Applied Microbiology; Genetics & Heredity
GA 662EU
UT WOS:000282790900001
PM 20828392
ER
PT J
AU Sun, PP
Siddiqi, G
Chi, MF
Bell, AT
AF Sun, Pingping
Siddiqi, Georges
Chi, Miaofang
Bell, Alexis T.
TI Synthesis and characterization of a new catalyst Pt/Mg(Ga)(Al)O for
alkane dehydrogenation
SO JOURNAL OF CATALYSIS
LA English
DT Article
DE Pt bimetallic catalyst; Mg(Ga)(Al)O support; STEM; EXAFS;
Dehydrogenation
ID N-BUTANE DEHYDROGENATION; MG-AL HYDROTALCITE; PT-GA INTERACTION; PROPANE
DEHYDROGENATION; DISSOCIATIVE CHEMISORPTION; SELECTIVE DEHYDROGENATION;
ISOBUTANE DEHYDROGENATION; ACETONE TRANSFORMATION; THERMAL TREATMENTS;
PT/SN CATALYSTS
AB A novel approach is described for preparing Ga-promoted Pt particles for the dehydrogenation of light alkanes to alkenes. The modifying element, Ga, was introduced by transference from the support, a calcined Mg(Ga)(Al)O hydrotalcite-like material. Pt nanoparticles were dispersed onto the calcined Mg(Ga)(Al)O starting from an organometallic precursor, followed by reduction. The formation of PtGa alloy particles is dependent on reduction temperature. Reduction at 723 K produces mainly metallic Pt particles. The average diameter of the Pt nanoparticles increased from 1.4 nm to 2.2 nm with increasing Ga content, and decreasing Al content of the support, demonstrating the importance of support Al atoms in stabilizing the dispersion of Pt. After reduction at 773-873 K, PtGa alloys were observed. It is proposed that at high reduction temperatures. H atoms formed on the surface of the metal particles spill over onto the support where they reduce Ga(3+) cation to atomic Ga, which then interacts with the supported Pt to form PtGa alloys. The activity, selectivity and stability of Pt/Mg(Ga)(Al)O catalysts for ethane and propane dehydrogenation are described in the second part of this study (G. Siddiqi, P. Sun, V. Galvita, A.T. Bell, Journal of catalysis (2010), doi:10.1016/j.jcat.2010.06.016 [40]). (C) 2010 Elsevier Inc. All rights reserved.
C1 [Sun, Pingping; Siddiqi, Georges; Bell, Alexis T.] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA.
[Chi, Miaofang] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Bell, AT (reprint author), Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA.
EM bell@cchem.berkeley.edu
RI Chi, Miaofang/Q-2489-2015;
OI Chi, Miaofang/0000-0003-0764-1567; Bell, Alexis/0000-0002-5738-4645
FU Scientific User Facilities Division, Office of Basic Energy Sciences,
U.S. Department of Energy
FX This work was supported by Chevron Energy and Technology Company. The
authors would like to thank Chris Canlas (Berkeley NMR facility) for his
assistance in acquiring the Ga NMR spectra. TEM work was supported by
ORNL's SHaRE User Facility, which is sponsored by the Scientific User
Facilities Division, Office of Basic Energy Sciences, U.S. Department of
Energy.
NR 69
TC 44
Z9 46
U1 13
U2 97
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 SEP 9
PY 2010
VL 274
IS 2
BP 192
EP 199
DI 10.1016/j.jcat.2010.06.017
PG 8
WC Chemistry, Physical; Engineering, Chemical
SC Chemistry; Engineering
GA 653SD
UT WOS:000282116100008
ER
PT J
AU Borovsky, JE
AF Borovsky, Joseph E.
TI On the variations of the solar wind magnetic field about the Parker
spiral direction
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID CORONAL MASS EJECTIONS; HELIOSPHERIC CURRENT SHEET; ROTATING RAREFACTION
REGIONS; COROTATING STREAM FRONTS; INTER-PLANETARY SHOCK; TANGENTIAL
DISCONTINUITIES; ALFVEN WAVES; SURFACE-WAVES; MAGNETOHYDRODYNAMIC
TURBULENCE; VOYAGER-2 OBSERVATIONS
AB Using ACE, Helios, and OMNI2 measurements, the direction vectors of the solar wind magnetic field are statistically analyzed. Two populations of direction vectors are found: a Gaussian distribution about the Parker spiral direction and an isotropic population. Examination of the isotropic population finds ejecta, long-duration non-Parker spiral intervals, magnetic depressions, heliospheric-current-sheet crossings, and spillover from the Gaussian population. Via numerical experiments, spillover in spherical coordinates from the Gaussian population into the isotropic population is explored and quantified. ACE measurements find that the angular width of the Gaussian Parker spiral population increases with solar wind speed. Examining the properties of the two populations year by year, no clear solar-cycle trends are found. Inside the compression regions of corotating interaction regions, the longitudinal width of the Gaussian Parker spiral population decreases by about a factor of two, while the latitudinal width of that population is approximately unchanged. Helios measurements find that the angular width of the Gaussian Parker spiral population decreases closer to the Sun, and the isotropic fraction decreases. The flux tube model of the solar wind structure is compared with spacecraft measurements: the model approximately agrees with the Helios behavior versus the distance from the Sun, and the model approximately agrees with the ACE behavior in the corotating interaction region compressions.
C1 Los Alamos Natl Lab, Space Sci & Applicat ISR 1, Los Alamos, NM 87545 USA.
RP Borovsky, JE (reprint author), Los Alamos Natl Lab, Space Sci & Applicat ISR 1, Mail Stop D466, Los Alamos, NM 87545 USA.
EM jborovsky@lanl.gov
FU NASA; NSF; Los Alamos National Laboratory
FX The author wishes to thank Mick Denton for producing the superposed
epoch data sets and to thank Jack Gosling, Pete Riley, Ruth Skoug, and
John Steinberg for helpful conversations. This research was supported by
the NASA Heliospheric SR&T Program, by the NASA Heliospheric
Guest-Investigator Program, by the NSF SHINE Program, and by the LDRD
Program at Los Alamos National Laboratory.
NR 132
TC 27
Z9 27
U1 0
U2 6
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 SEP 9
PY 2010
VL 115
AR A09101
DI 10.1029/2009JA015040
PG 33
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 649GZ
UT WOS:000281757500002
ER
PT J
AU Sivaramakrishnan, R
Su, MC
Michael, JV
Klippenstein, SJ
Harding, LB
Ruscic, B
AF Sivaramakrishnan, R.
Su, M. -C.
Michael, J. V.
Klippenstein, S. J.
Harding, L. B.
Ruscic, B.
TI Rate Constants for the Thermal Decomposition of Ethanol and Its
Bimolecular Reactions with OH and D: Reflected Shock Tube and
Theoretical Studies
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID TEMPERATURE RATE CONSTANTS; ACTIVE THERMOCHEMICAL TABLES; CORRELATED
MOLECULAR CALCULATIONS; DENSITY-FUNCTIONAL GEOMETRIES; PRESSURE
RATE-CONSTANT; SET MODEL CHEMISTRY; GAUSSIAN-BASIS SETS; GAS-PHASE
REACTIONS; HYDROXYL RADICALS; ALIPHATIC-ALCOHOLS
AB The thermal decomposition of ethanol and its reactions with OH and D have been studied with both shock tube experiments and ab initio transition state theory-based master equation calculations. Dissociation rate constants for ethanol have been measured at high T in reflected shock waves using OH optical absorption and high-sensitivity H-atom ARAS detection. The three dissociation processes that are dominant at high T are
C(2)HSOH -> C(2)H(4) + H(2)O (A)
-> CH(3) + CH(2)OH (B)
-> C(2)H(5) + OH (C)
The rate coefficient for reaction C was measured directly with high sensitivity at 308 nm using a multipass optical White cell. Meanwhile, H-atom ARAS measurements yield the overall rate coefficient and that for the sum of reactions B and C, since H-atoms are instantaneously formed from the decompositions of CH(2)OH and C(2)H(5) into CH(2)O H and C(2)H(4) H, respectively. By difference, rate constants for reaction 1 could be obtained. One potential complication is the scavenging of OH by unreacted ethanol in the OH experiments, and therefore, rate constants for
OH + C(2)H(5)OH -> products (D)
were measured using tert-butyl hydroperoxide (tBH) as the thermal source for OH. The present experiments can be represented by the Arrhenius expression
k = (2.5 +/- 0.43) x 10(-11) exp(-911 +/- 191 K/T) cm(3) molecule(-1) s(-1)
over the T range 857-1297 K. For completeness, we have also measured the rate coefficient for the reaction of D atoms with ethanol
D + C(2)H(5)OH -> products (E)
whose H analogue is another key reaction in the combustion of ethanol. Over the T range 1054-1359 K, the rate constants from the present experiments can be represented by the Arrhenius expression,
k = (3.98 +/- 0.76) x 10(-10) exp(-4494 +/- 235 K/T) cm(3) molecule(-1) s(-1)
The high-pressure rate coefficients for reactions B and C were studied with variable reaction coordinate transition state theory employing directly determined CASPT2/cc-pvdz interaction energies. Reactions A, D, and E were studied with conventional transition state theory employing QCISD(T)/CBS energies. For the saddle point in reaction A, additional high-level corrections are evaluated. The predicted reaction exo- and endothermicities are in good agreement with the current Active Thermochemical Tables values. The transition state theory predictions for the microcanonical rate coefficients in ethanol decomposition are incorporated in master equation calculations to yield predictions for the temperature and pressure dependences of reactions A C. With modest adjustments (<1 kcal/mol) to a few key barrier heights, the present experimental and adjusted theoretical results yield a consistent description of both the decomposition (1-3) and abstraction kinetics (4 and 5). The present results are compared with earlier experimental and theoretical work.
C1 [Sivaramakrishnan, R.; Su, M. -C.; Michael, J. V.; Klippenstein, S. J.; Harding, L. B.; Ruscic, B.] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
[Su, M. -C.] Sonoma State Univ, Dept Chem, Rohnert Pk, CA 94928 USA.
RP Michael, JV (reprint author), Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM jmichael@anl.gov; sjk@anl.gov
RI SIVARAMAKRISHNAN, RAGHU/C-3481-2008; Michael, Joe/E-3907-2010; Ruscic,
Branko/A-8716-2008;
OI SIVARAMAKRISHNAN, RAGHU/0000-0002-1867-1254; Ruscic,
Branko/0000-0002-4372-6990; Klippenstein, Stephen/0000-0001-6297-9187
FU U.S. Department of Energy, Office of Basic Energy Sciences, Division of
Chemical Sciences, Geosciences, and Biosciences [DE-AC02-06CH11357]
FX This work was supported by the U.S. Department of Energy, Office of
Basic Energy Sciences, Division of Chemical Sciences, Geosciences, and
Biosciences, under Contract no. DE-AC02-06CH11357.
NR 92
TC 57
Z9 57
U1 3
U2 62
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 SEP 9
PY 2010
VL 114
IS 35
BP 9425
EP 9439
DI 10.1021/jp104759d
PG 15
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 644TO
UT WOS:000281404400003
PM 20715882
ER
PT J
AU Wang, XL
Feygenson, M
Aronson, MC
Han, WQ
AF Wang, Xiao-Liang
Feygenson, Mikhail
Aronson, Meigan C.
Han, Wei-Qiang
TI Sn/SnOx Core-Shell Nanospheres: Synthesis, Anode Performance in Li Ion
Batteries, and Superconductivity
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID LITHIUM BATTERIES; MAGNETIC-PROPERTIES; POLYOL SYNTHESIS;
LOW-TEMPERATURE; SN NANOWIRES; TIN; NANOCRYSTALS; COMPOSITE;
NANOSTRUCTURES; ELECTRODES
AB Sn/SnOx core-shell nanospheres have been synthesized via a modified polyol process. Their size can be readily controlled by tuning the usage of surface stabilizers and the temperature. Anode performance in Li ion batteries and their superconducting properties is detailed. As anode materials, 45 nm nanospheres outperform both larger and smaller ones. Thus, they exhibit a capacity of about 3443 mAh cm(-3) and retain about 88% of after 10 cycles. We propose a model based on the microstructural evolution to explain the size impact on nanosphere performance. Magnetic measurements indicate that the nanospheres become superconducting below the transition temperature T-C = 3.7 K, which is similar to the value obtained in bulk tin. Although Tc does not significantly change with the size of the Sn core, we determined that the critical field H-C of nanospheres can be as much as a factor of 30 larger compared to the bulk value. Alternating current measurements demonstrated that a transition from conventional to filamentary superconducting structure occurs in Sn/SnOx particles as their size increases. The transition is determined by the relationship between the particle size and the magnetic field penetration depth.
C1 [Wang, Xiao-Liang; Han, Wei-Qiang] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA.
[Feygenson, Mikhail; Aronson, Meigan C.] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
[Aronson, Meigan C.] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 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; Feygenson, Mikhail /H-9972-2014
OI Feygenson, Mikhail /0000-0002-0316-3265
FU U.S. DOE [DE-AC02-980CH10886]; Brookhaven National Laboratory; U.S.
Department of Energy, Office of Basic Energy Sciences at Brookhaven
[DE-AC02-98CH1886]
FX This work is supported by the U.S. DOE under Contract No.
DE-AC02-980CH10886 and E-LDRD Fund of Brookhaven National Laboratory.
This work was carried out under the auspices of the U.S. Department of
Energy, Office of Basic Energy Sciences at Brookhaven under Contract No.
DE-AC02-98CH1886. We thank Drs. Lihua Zhang, Jia-Jun Chen, Jason Graetz,
and Myron Strongin (Brookhaven National Laboratory) for their technical
help and valuable discussions.
NR 51
TC 45
Z9 46
U1 7
U2 47
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 SEP 9
PY 2010
VL 114
IS 35
BP 14697
EP 14703
DI 10.1021/jp101852y
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 684AT
UT WOS:000284520100004
ER
PT J
AU Shepherd, DP
Whitcomb, KJ
Milligan, KK
Goodwin, PM
Gelfand, MP
Van Orden, A
AF Shepherd, Douglas P.
Whitcomb, Kevin J.
Milligan, Kenneth K.
Goodwin, Peter M.
Gelfand, Martin P.
Van Orden, Alan
TI Fluorescence Intermittency and Energy Transfer in Small Clusters of
Semiconductor Quantum Dots
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID SOLAR-CELLS; NANOCRYSTALS; INTENSITY; EMISSION; DYNAMICS; BEHAVIOR;
GENERATION; EFFICIENCY; MOLECULES; SOLIDS
AB We have studied isolated semiconductor nanocrystal quantum dots (QDs) and small clusters of QDs by single-molecule time-correlated single-photon counting, from which fluorescence intensity trajectories, autocorrelation functions, decay histograms, and lifetime-intensity distributions have been constructed. These measurements confirm that QD clusters exhibit unique fluorescence behavior not observed in isolated QDs. In particular, the QD clusters exhibit a short-lifetime component in their fluorescence decay that is correlated with low fluorescence intensity of the cluster. A model based on nonradiative energy transfer to QDs within a cluster that have smaller energy gaps, combined with independent blinking for the QDs in a cluster, accounts for the main experimental features.
C1 [Whitcomb, Kevin J.; Milligan, Kenneth K.; Van Orden, Alan] Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA.
[Shepherd, Douglas P.; Gelfand, Martin P.] Colorado State Univ, Dept Phys, Ft Collins, CO 80523 USA.
[Goodwin, Peter M.] Los Alamos Natl Lab, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA.
RP Van Orden, A (reprint author), Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA.
EM vanorden@lamar.colostate.edu
RI Van Orden, Alan/N-4219-2015;
OI Gelfand, Martin/0000-0002-1867-6231
FU Colorado Renewable Energy Collaboratory-Center for Revolutionary Solar
Photo-conversion; American Chemistry Society [46878-ac]; Gary E. Maciel
Fellowship Foundation; McNair Scholars Program; U.S. Department of
Energy, Office of Basic Energy Sciences [DE-AC52-06NA25396,
DE-AC04-94AL85000]
FX Support from the Colorado Renewable Energy Collaboratory-Center for
Revolutionary Solar Photo-conversion and the Petroleum Research Fund of
the American Chemistry Society (grant no. 46878-ac) is gratefully
acknowledged. K.J.M received support from the Gary E. Maciel Fellowship
Foundation. K.K.M. was supported by the McNair Scholars Program. This
work was performed, in part, at the Center for Integrated
Nanotechnologies, a U.S. Department of Energy, Office of Basic Energy
Sciences user facility at Los Alamos National Laboratory (Contract
DE-AC52-06NA25396) and Sandia National Laboratories (Contract
DE-AC04-94AL85000). We also thank Justin Sambur, Bruce Parkinson, and
Justin Johnson for helpful discussions.
NR 48
TC 19
Z9 19
U1 2
U2 21
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 SEP 9
PY 2010
VL 114
IS 35
BP 14831
EP 14837
DI 10.1021/jp105150x
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 684AT
UT WOS:000284520100023
ER
PT J
AU Siegal, MP
Overmyer, DL
Provencio, PP
Tallant, DR
AF Siegal, Michael P.
Overmyer, Donald L.
Provencio, Paula P.
Tallant, David R.
TI Linear Behavior of Carbon Nanotube Diameters with Growth Temperature
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID CHEMICAL-VAPOR-DEPOSITION; RAMAN-SPECTROSCOPY; CATALYST; FILMS;
NUCLEATION; SUBSTRATE; DENSITY; ARRAYS
AB High crystalline quality single- and multiwalled carbon nanotubes (CNTs) grow using thermal chemical vapor deposition (CVD) at temperatures ranging from 530 to 630 degrees C. Using identical Ni catalyst layers and a constant CO reduction annealing process at 600 degrees C, the number of walls in the resulting CNTs increases linearly from one to eight over this growth temperature range. The highest temperature used in the growth process appears to control the resulting inner core diameter, which is similar to 1 nm for all CNTs grown <= 610 degrees C, near the CO reduction anneal used for all the samples. The corresponding CNT outer diameters also increase linearly from 1 to 5 nm up to 610 degrees C. Using growth temperatures measurably higher than that of the reduction anneal results in both larger inner and outer diameters, inferring that the Ni catalyst islands grow with increasing temperature. These results suggest that independent control of the number of walls and the inner core diameter in CNTs is possible.
C1 [Siegal, Michael P.; Overmyer, Donald L.; Provencio, Paula P.; Tallant, David R.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Siegal, MP (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM mpsiega@sandia.gov
FU Sandia National Laboratories; United States Department of Energy's
National Nuclear Security Administration [DE-AC04-94AL85000]
FX This study was supported by the Laboratory Directed Research and
Development 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 No. DE-AC04-94AL85000.
NR 27
TC 4
Z9 4
U1 0
U2 6
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 SEP 9
PY 2010
VL 114
IS 35
BP 14864
EP 14867
DI 10.1021/jp105815u
PG 4
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 684AT
UT WOS:000284520100029
ER
PT J
AU Arima, K
Jiang, P
Deng, XY
Bluhm, H
Salmeron, M
AF Arima, Kenta
Jiang, Peng
Deng, Xingyi
Bluhm, Hendrik
Salmeron, Miquel
TI Water Adsorption, Solvation, and Deliquescence of Potassium Bromide Thin
Films on SiO2 Studied by Ambient-Pressure X-ray Photoelectron
Spectroscopy
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID POLARIZATION FORCE MICROSCOPY; SALT-SOLUTIONS; POLAR SUNRISE; SEA-SALT;
OZONE DESTRUCTION; ELECTRON-SPECTROSCOPY; MOLECULAR-DYNAMICS;
AQUEOUS-SOLUTIONS; ALKALI-HALIDES; IN-SITU
AB The adsorption of water on KBr thin films evaporated onto SiO2 was investigated as a function of relative humidity (RH) by ambient pressure X-ray photoelectron spectroscopy. At 30% RH, adsorbed water reaches a coverage of approximately 1 ML (monolayer). As the humidity continues to increase, the coverage of water remains constant or increases very slowly until 60% RH, followed by a rapid increase. At low RHs, the Br/K ratio on a submonolayer-thick film drops to less than 0.1, as a result of loss of Br atoms in the film due to radiation damage. With increasing humidity, solvation increases ion mobility and gives rise to a partial recovery of the Br/K ratio. Above 60% RI-I, the increase of the Br/K ratio accelerates. Above the deliquescence point (85% RH), the thickness of the water layer continues to increase and reaches more than three layers near saturation. The enhancement of the Br/K ratio at this stage is roughly a factor of 2.3 on a 0.5 nm KBr film, indicating a strong preferential segregation of Br ions to the air-liquid interface of the thin saline solution on SiO2.
C1 [Jiang, Peng; Deng, Xingyi; Salmeron, Miquel] Univ Calif Berkeley, Div Mat Sci, Berkeley, CA 94720 USA.
[Arima, Kenta] Osaka Univ, Grad Sch Engn, Dept Precis Sci & Technol, Suita, Osaka 5650871, Japan.
Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
[Deng, Xingyi] US DOE, Parsons Project Serv Inc, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA.
[Bluhm, Hendrik] Lawrence Berkeley Natl Lab, Div Chem Sci, Berkeley, CA 94720 USA.
RP Salmeron, M (reprint author), Univ Calif Berkeley, Div Mat Sci, Berkeley, CA 94720 USA.
EM mbsalmeron@lbl.gov
OI Deng, Xingyi/0000-0001-9109-1443
FU Office of Science, Office of Basic Energy Sciences, Materials Sciences
and Engineering Division, of the U.S. Department of Energy
[DE-AC02-05CH11231]; Yamada Science Foundation
FX The authors would like to thank Dr. Albert Verdaguer for technical
discussions on AP-XPS. 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, under Contract
No. DE-AC02-05CH11231. K.A. acknowledges financial support from Yamada
Science Foundation.
NR 67
TC 15
Z9 15
U1 2
U2 21
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 SEP 9
PY 2010
VL 114
IS 35
BP 14900
EP 14906
DI 10.1021/jp101683z
PG 7
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 684AT
UT WOS:000284520100034
ER
PT J
AU Chen, ZX
Cao, YL
Qian, JF
Ai, XP
Yang, HX
AF Chen, Zhongxue
Cao, Yuliang
Qian, Jiangfeng
Ai, Xinping
Yang, Hanxi
TI Antimony-Coated SiC Nanoparticles as Stable and High-Capacity Anode
Materials for Li-Ion Batteries
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID ELECTROCHEMICAL PERFORMANCE; IMPEDANCE SPECTROSCOPY; NEGATIVE ELECTRODE;
C COMPOSITE; LITHIUM; NANOCOMPOSITE; STORAGE; SILICON; CELLS; SB
AB A simple synthetic route was developed to transform micrometer-sized Sb powders into new Sb-sandwiched nanocomposite particles (SiC-Sb-C) with Sb nanoparticles pinned on rigid SiC nanocores and surface-coated with carbon by use of a high-energy mechanical milling technique at ambient temperature. The as-prepared SiC-Sb-C nanoparticles exhibited excellent cycling ability and rate capability, delivering a specific capacity of >440 mA.h g(-1) after 120 cycles and a quite high capacity of >= 220 mA.h g(-1) at a very high-rate of 4 C (2000 mA g(-1)). This greatly improved electrochemical performance could be attributed to the structural stability of this material, which can not only effectively confine the volume expansion of the sandwiched Sb layer but also prevent the aggregation of Sb nanocrystallites and keep the mechanical integrity of the electrodes. In addition, this new synthetic method is completely green with a full utilization of raw materials and without any emission of wastes, easily adopted for large-scale production and also extended for other attractive lithium storage metals and alloys.
C1 [Chen, Zhongxue; Cao, Yuliang; Qian, Jiangfeng; Ai, Xinping; Yang, Hanxi] Wuhan Univ, Coll Chem & Mol Sci, Hubei Key Lab Electrochem Power Sources, Wuhan 430072, Peoples R China.
[Cao, Yuliang] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Cao, YL (reprint author), Wuhan Univ, Coll Chem & Mol Sci, Hubei Key Lab Electrochem Power Sources, Wuhan 430072, Peoples R China.
EM ylcao@whu.edu.cn; hxyang@whu.edu.cn
RI Chen, Zhongxue/J-9070-2014
FU National Basic Research Program of China [2009CB220103]; National
Science Foundation of China [20873095]
FX We acknowledge financial support by the National Basic Research Program
of China (2009CB220103) and the National Science Foundation of China
(No. 20873095).
NR 28
TC 16
Z9 17
U1 6
U2 80
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 SEP 9
PY 2010
VL 114
IS 35
BP 15196
EP 15201
DI 10.1021/jp104099r
PG 6
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 684AT
UT WOS:000284520100077
ER
PT J
AU Qin, Y
Chen, ZH
Lee, HS
Yang, XQ
Amine, K
AF Qin, Yan
Chen, Zonghai
Lee, H. S.
Yang, X-Q
Amine, K.
TI Effect of Anion Receptor Additives on Electrochemical Performance of
Lithium-Ion Batteries
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID THERMAL-STABILITY; TRIS(PENTAFLUOROPHENYL) BORANE; NONAQUEOUS SOLUTIONS;
PAIR DISSOCIATION; BINDING PROPERTIES; LEWIS-ACID; ELECTROLYTE;
CONDUCTIVITY; SALTS; MOLECULES
AB Four boron-based anion receptors were investigated as electrolyte additives for lithium-ion batteries. The electrochemical performance of lithium-ion cells was found to strongly depend on the structure of the anion receptor added to the electrolyte. The capacity retention of the lithium-ion cell was slightly improved by adding 0.07 M bis(1,1,1,3,3,3-hexafluoroisopropyl)pentafluorophenylboronate additive, whereas the addition of 2,5-bis(trifluoromethylphenyl)tetrafluoro-1,3,2-benzodioxaborole dramatically deteriorated the electrochemical performance. The addition of a certain type of anion receptor can promote the electrochemical decomposition of the electrolyte, resulting in high interfacial impedance and accelerated capacity fading of lithium-ion cells. Ab initio calculations showed that the electrochemical performance of anion receptors had good correlation to the degree of localization of the lowest unoccupied molecular orbital at the boron center of anion receptors, which can potentially be used in the search for new anion receptors for lithium-ion batteries.
C1 [Qin, Yan; Chen, Zonghai; Amine, K.] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
[Lee, H. S.; Yang, X-Q] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
RP Chen, ZH (reprint author), Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
RI Chen, Zonghai/K-8745-2013; Amine, Khalil/K-9344-2013
FU U.S. Department of Energy, FreedomCAR and Vehicle Technologies Office;
UChicago Argonne, LLC [DE-AC02-06CH11357]; U.S. Department of Energy
[DEAC02-98CH10886]
FX Research at Argonne National Laboratory was funded by U.S. Department of
Energy, FreedomCAR and Vehicle Technologies Office. Argonne National
Laboratory is operated for the U.S. Department of Energy by UChicago
Argonne, LLC, under Contract DE-AC02-06CH11357. The work at Brookhaven
National Laboratory was supported by the Assistant Secretary for Energy
Efficiency and Renewable Energy, Office of Vehicle Technologies, under
the program of "Hybrid and Electric Systems", of the U.S. Department of
Energy under Contract No. DEAC02-98CH10886.
NR 38
TC 13
Z9 13
U1 4
U2 37
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 SEP 9
PY 2010
VL 114
IS 35
BP 15202
EP 15206
DI 10.1021/jp104341t
PG 5
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 684AT
UT WOS:000284520100078
ER
PT J
AU Graham, DD
Graetz, J
Reilly, J
Wegrzyn, JE
Robertson, IM
AF Graham, Dennis D.
Graetz, Jason
Reilly, James
Wegrzyn, James E.
Robertson, Ian M.
TI Location of Ti Catalyst in the Reversible AlH3 Adduct of
Triethylenediamine
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID ALUMINUM-HYDRIDE; HYDROGEN STORAGE; POLYMORPHS; KINETICS
AB AlH3, a metastable binary hydride with a hydrogen content of 10.1 wt % hydrogen and a density of 1.48 g/mL, is a potential lightweight hydrogen storage system for transportation applications. A key component to understanding the discharge and uptake of hydrogen is the role of the Ti dopant in these processes. Here, the morphological and compositional changes caused by the synthesis and dehydriding of the AlH3 adduct of triethylenediamine was determined by using a combination of scanning electron and scanning transmission electron microscopy as well as X-ray energy dispersive spectroscopy. It is shown that there is significant loss of the added Ti at each step in the synthesis; the Ti agglomerates in the Al particles, causing enrichment, and the amount of Ti needed to catalyze the activity is on the order of 0.4 at.%, which amounts to approximately a 90% reduction from the amount added.
C1 [Graham, Dennis D.; Robertson, Ian M.] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
[Graetz, Jason; Reilly, James; Wegrzyn, James E.] Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Robertson, IM (reprint author), Univ Illinois, Dept Mat Sci & Engn, 1304 W Green St, Urbana, IL 61801 USA.
EM ianr@illinois.edu
FU Metal Hydrides Center of Excellence, Office of Energy Efficiency and
Renewable Energy, U.S. Department of Energy [DE-AC02-98CH1-886,
DE-FC36-05GO15064]
FX This work was partially supported through the Metal Hydrides Center of
Excellence, Office of Energy Efficiency and Renewable Energy, U.S.
Department of Energy under Contract No. DE-AC02-98CH1-886 (BNL) and
Grant No. DE-FC36-05GO15064 (University of Illinois). The electron
microscopy was performed in the Center for Microanalysis of Materials in
the Frederick Seitz Materials Research Laboratory at the University of
Illinois. D.D.G. thanks B. D. Miller for his assistance with the
scanning electron microscopy.
NR 17
TC 8
Z9 8
U1 1
U2 12
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 SEP 9
PY 2010
VL 114
IS 35
BP 15207
EP 15211
DI 10.1021/jp104453w
PG 5
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 684AT
UT WOS:000284520100079
ER
PT J
AU Fang, A
Koschny, T
Soukoulis, CM
AF Fang, A.
Koschny, Th.
Soukoulis, C. M.
TI Self-consistent calculations of loss-compensated fishnet metamaterials
SO PHYSICAL REVIEW B
LA English
DT Article
ID NEGATIVE-INDEX METAMATERIALS; REFRACTIVE-INDEX; GAIN
AB We present a computational approach, allowing for a self-consistent treatment of three-dimensional fishnet metamaterial coupled to a gain material incorporated into the nanostructure. We show numerically that one can compensate the losses by incorporating gain material inside the fishnet structure. The pump rate needed to compensate the loss is much smaller than the bulk gain and the figure of merit [FOM=vertical bar Re(n)/Im(n)vertical bar] increases dramatically with the pump rate. Transmission, reflection, and absorption data, as well as the retrieved effective parameters, are presented for the fishnet structure with and without gain material. Kramers-Kronig relations of the effective parameters are in excellent agreement with the retrieved results with gain.
C1 [Fang, A.; Koschny, Th.; Soukoulis, C. M.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Fang, A.; Koschny, Th.; Soukoulis, C. M.] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
[Koschny, Th.; Soukoulis, C. M.] Univ Crete, Dept Mat Sci & Technol, FORTH, Iraklion 71110, Crete, Greece.
[Koschny, Th.; Soukoulis, C. M.] Univ Crete, Inst Elect Struct & Laser, FORTH, Iraklion 71110, Crete, Greece.
RP Fang, A (reprint author), Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
RI Soukoulis, Costas/A-5295-2008
FU Department of Energy (Basic Energy Sciences) [DE-AC02-07CH11358];
European Community [213390]; Sandia National Laboratories
FX We thank M. Wegener for useful discussions. Work at Ames Laboratory was
supported by the Department of Energy (Basic Energy Sciences) under
Contract No. DE-AC02-07CH11358. This work was partially supported by the
European Community FET project PHOME (Contract No. 213390) and by
Laboratory-Directed Research and Development Program at Sandia National
Laboratories.
NR 39
TC 59
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U1 3
U2 22
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 SEP 9
PY 2010
VL 82
IS 12
AR 121102
DI 10.1103/PhysRevB.82.121102
PG 4
WC Physics, Condensed Matter
SC Physics
GA 647ZD
UT WOS:000281658500001
ER
PT J
AU Gambari, J
Fernandez-Dominguez, AI
Maier, SA
Williams, BS
Kumar, S
Reno, JL
Hu, Q
Phillips, CC
AF Gambari, Johannes
Fernandez-Dominguez, Antonio I.
Maier, Stefan A.
Williams, Ben S.
Kumar, Sushil
Reno, John L.
Hu, Qing
Phillips, Chris C.
TI Thresholdless coherent light scattering from subband polaritons in a
strongly coupled microcavity
SO PHYSICAL REVIEW B
LA English
DT Article
ID QUANTUM-CASCADE LASERS; FIELD ENHANCEMENT; MODE
AB We study a "strongly coupled" (SC) polariton system formed between the atomlike intersubband transitions in a semiconductor nanostructure and the terahertz optical modes that are localized at the edges of a gold aperture. The polaritons can be excited optically, by incoherent excitation with band-gap radiation, and we find that they also coherently scatter the same input laser, to give strikingly sharp "sideband" (SB) spectral peaks, in the backscattered spectrum. The SB intensity is a sensitive track of the polariton density and they can be detected down to a quantum noise floor that is more than 2500 times lower than the excitation thresholds of comparable quantum cascade laser diodes. Compared with other coherent scattering mechanisms, higher-order SB scattering events are readily observable, and we speculate that if suitably optimized, the effect may find utility in a passive component capable of all-optical wavelength shifting for telecommunications systems.
C1 [Gambari, Johannes; Fernandez-Dominguez, Antonio I.; Maier, Stefan A.; Phillips, Chris C.] Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England.
[Williams, Ben S.] Univ Calif Los Angeles, Calif NanoSyst Inst, Dept Elect Engn, Los Angeles, CA 90095 USA.
[Williams, Ben S.; Kumar, Sushil; Hu, Qing] MIT, Dept Elect Engn, Comp Sci & Res Lab Elect, Cambridge, MA 02139 USA.
[Reno, John L.] Sandia Natl Labs, Dept 1123, Albuquerque, NM 87185 USA.
RP Gambari, J (reprint author), Univ London Imperial Coll Sci Technol & Med, Dept Phys, London SW7 2AZ, England.
RI Williams, Benjamin/B-4494-2013; Fernandez-Dominguez, Antonio
I./C-4448-2013
OI Williams, Benjamin/0000-0002-6241-8336; Fernandez-Dominguez, Antonio
I./0000-0002-8082-395X
FU Engineering and Physical Sciences Research Council (EPSRC); U.S. Air
Force Office of Scientific Research (AFOSR)
FX Helpful conversations with Paul Eastham are gratefully acknowledged.
This work was supported by the Engineering and Physical Sciences
Research Council (EPSRC), and by the U.S. Air Force Office of Scientific
Research (AFOSR)
NR 18
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U1 0
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 SEP 9
PY 2010
VL 82
IS 12
AR 121303
DI 10.1103/PhysRevB.82.121303
PG 4
WC Physics, Condensed Matter
SC Physics
GA 647ZD
UT WOS:000281658500002
ER
PT J
AU Ginis, V
Tassin, P
Soukoulis, CM
Veretennicoff, I
AF Ginis, V.
Tassin, P.
Soukoulis, C. M.
Veretennicoff, I.
TI Confining light in deep subwavelength electromagnetic cavities
SO PHYSICAL REVIEW B
LA English
DT Article
ID MAXWELLS EQUATIONS; METAMATERIALS; REFRACTION; DESIGN; CLOAK
AB We demonstrate that it is possible to confine electromagnetic radiation in cavities that are significantly smaller than the wavelength of the radiation it encapsulates. To this aim, we use the techniques of transformation optics. First, we present a "perfect cavity" of arbitrarily small size in which such confined modes can exist. Furthermore, we show that these eigenmodes have a continuous spectrum and that bending losses are absent, in contrast to what is observed in traditional microcavities. Finally, we introduce an alternative cavity configuration that is less sensitive to material imperfections and still exhibits deep subwavelength modes combined with high quality factor, even if considerable material losses are included. Such a cavity may be interesting for the storage of information in optical data processing and for applications in quantum optics.
C1 [Ginis, V.; Tassin, P.; Veretennicoff, I.] Vrije Univ Brussel, Dept Appl Phys & Photon, B-1050 Brussels, Belgium.
[Tassin, P.; Soukoulis, C. M.] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA.
[Tassin, P.; Soukoulis, C. M.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Soukoulis, C. M.] Univ Crete, FORTH, Inst Elect Struct & Laser, Iraklion 71110, Crete, Greece.
[Soukoulis, C. M.] Univ Crete, Dept Mat Sci & Technol, Iraklion 71110, Crete, Greece.
RP Ginis, V (reprint author), Vrije Univ Brussel, Dept Appl Phys & Photon, Pl Laan 2, B-1050 Brussels, Belgium.
RI Tassin, Philippe/B-7152-2008; Ginis, Vincent/J-9700-2014; Soukoulis,
Costas/A-5295-2008
FU BelSPO [IAP6/10]; FWO-Vlaanderen; Research Council (OZR) of the VUB;
Department of Energy (Basic Energy Sciences) [DE-AC02-07CII11358];
Belgian American Educational Foundation
FX We thank Ingo Fischer for inspiring conversations on using invisibility
cloaks as electromagnetic cavities. Work at the VUB was supported by
BelSPO (Grant No. IAP6/10 Photonics@be), the FWO-Vlaanderen, and the
Research Council (OZR) of the VUB. Work at Ames Laboratory was supported
by the Department of Energy (Basic Energy Sciences) under Contract No.
DE-AC02-07CII11358. P.T. acknowledges the FWO-Vlaanderen and the Belgian
American Educational Foundation for financial support.
NR 25
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U1 0
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 SEP 9
PY 2010
VL 82
IS 11
AR 113102
DI 10.1103/PhysRevB.82.113102
PG 4
WC Physics, Condensed Matter
SC Physics
GA 647ZC
UT WOS:000281658400001
ER
PT J
AU Pennycook, TJ
Hadjisavvas, G
Idrobo, JC
Kelires, PC
Pantelides, ST
AF Pennycook, Timothy J.
Hadjisavvas, George
Idrobo, Juan C.
Kelires, Pantelis C.
Pantelides, Sokrates T.
TI Optical gaps of free and embedded Si nanoclusters: Density functional
theory calculations
SO PHYSICAL REVIEW B
LA English
DT Article
ID TOTAL-ENERGY CALCULATIONS; AUGMENTED-WAVE METHOD; ELECTRONIC-STRUCTURE;
POROUS SILICON; QUANTUM CONFINEMENT; OXIDIZED SI; BASIS-SET;
NANOCRYSTALS; LUMINESCENCE; ABSORPTION
AB The optical gaps of free and embedded Si nanoclusters are studied within the time-dependent local-density approximation. The effects of deformation, the bonding of individual O atoms on the surface, and coverage by SiO2 layers on the highest occupied molecular orbital-lowest unoccupied molecular orbital and optical gaps are systematically compared. It is found that all three can have a significant impact. Oxygen bonded to the surface and deformation cause the greatest reduction in the gaps, particularly in combination.
C1 [Pennycook, Timothy J.; Idrobo, Juan C.; Pantelides, Sokrates T.] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA.
[Pennycook, Timothy J.; Idrobo, Juan C.; Pantelides, Sokrates T.] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA.
[Hadjisavvas, George; Kelires, Pantelis C.] Cyprus Univ Technol, Dept Mech & Mat Sci Engn, CY-3603 Limassol, Cyprus.
RP Pennycook, TJ (reprint author), Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA.
EM t.pennycook@vanderbilt.edu
RI Pennycook, Timothy/B-4946-2014; Idrobo, Juan/H-4896-2015
OI Pennycook, Timothy/0000-0002-0008-6516; Idrobo, Juan/0000-0001-7483-9034
FU National Science Foundation GOALI [DMR-0513048]; Alcoa, Inc.; McMinn
Endowment at Vanderbilt University; Division of Materials Sciences and
Engineering, U.S. Department of Energy; Office of Science of the U.S.
Department of Energy [DE-AC02-05CH11231.]
FX This work was supported in part by the National Science Foundation GOALI
under Grant No. DMR-0513048, by Alcoa, Inc., by the McMinn Endowment at
Vanderbilt University, and by the Division of Materials Sciences and
Engineering, U.S. Department of Energy. Computations were performed at
the National Energy Research Scientific Computing Center, which is
supported by the Office of Science of the U.S. Department of Energy
under Contract No. DE-AC02-05CH11231.
NR 53
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U1 1
U2 8
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 SEP 9
PY 2010
VL 82
IS 12
AR 125310
DI 10.1103/PhysRevB.82.125310
PG 6
WC Physics, Condensed Matter
SC Physics
GA 647ZD
UT WOS:000281658500006
ER
PT J
AU Persson, K
Hinuma, Y
Meng, YS
Van der Ven, A
Ceder, G
AF Persson, Kristin
Hinuma, Yoyo
Meng, Ying Shirley
Van der Ven, Anton
Ceder, Gerbrand
TI Thermodynamic and kinetic properties of the Li-graphite system from
first-principles calculations
SO PHYSICAL REVIEW B
LA English
DT Article
ID AUGMENTED-WAVE METHOD; INTERCALATION COMPOUNDS; PHASE-DIAGRAM; LITHIUM
DIFFUSION; LITHIATED GRAPHITE; ENERGY; CARBON; COEFFICIENT; BATTERIES;
DENSITY
AB We present an ab initio study of the thermodynamics and kinetics of Li(x)C(6), relevant for anode Li intercalation in rechargeable Li batteries. In graphite, the interlayer interactions are dominated by Van der Waals forces, which are not captured with standard density-functional theory (DFT). By calculating the voltage profile for Li intercalation into graphite and comparing it to experimental results, we find that only by correcting for vdW interactions between the graphene planes is it possible to reproduce the experimentally observed sequence of phases, as a function of Li content. At higher Li content the interlayer binding forces are increasingly due to Li-C interactions, which are well characterized by DFT. Using the calculated energies, corrected for the vdW interactions, we derive an ab initio lattice model, based on the cluster-expansion formalism, that accounts for interactions among Li ions in Li(x)C(6) having a stage I and stage II structure. We find that the resulting cluster expansions are dominated by Li-Li repulsive interactions. The phase diagram, obtained from Monte Carlo simulations, agrees well with experiments except at low Li concentrations as we exclude stage III and stage IV compounds. Furthermore, we calculate Li migration barriers for stage I and stage II compounds and identify limiting factors for Li mobility in the in-plane dilute as well as in the high Li concentration range. The Li diffusivity, obtained through kinetic Monte Carlo simulations, slowly decreases as a function of Li content, consistent with increasing Li-Li repulsions. However, overall we find very fast Li diffusion in bulk graphite, which may have important implications for Li battery anode optimizations.
C1 [Persson, Kristin] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Hinuma, Yoyo; Meng, Ying Shirley] Univ Calif San Diego, La Jolla, CA 92093 USA.
[Van der Ven, Anton] Univ Michigan, Ann Arbor, MI 48109 USA.
[Ceder, Gerbrand] MIT, Cambridge, MA 02139 USA.
RP Persson, K (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
RI Meng, Shirley /I-1276-2013
FU Office of Vehicle Technologies of the U. S. Department of Energy
[DE-AC02-05CH11231]; Ford Motor Co. [014502-010]; NSF [DMR 0748516]
FX Work at the Lawrence Berkeley National Laboratory was supported by the
Assistant Secretary for Energy Efficiency and Renewable Energy, Office
of Vehicle Technologies of the U. S. Department of Energy, under
Contract No. DE-AC02-05CH11231. Work at the Massachusetts Institute of
Technology was supported by Ford Motor Co. under Grant No. 014502-010.
Anton van der Ven acknowledges support from NSF under Grant No. DMR
0748516.
NR 54
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U2 162
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 SEP 9
PY 2010
VL 82
IS 12
AR 125416
DI 10.1103/PhysRevB.82.125416
PG 9
WC Physics, Condensed Matter
SC Physics
GA 647ZD
UT WOS:000281658500012
ER
PT J
AU Zhang, LX
Zhou, XF
Wang, HT
Xu, JJ
Li, JB
Wang, EG
Wei, SH
AF Zhang, Lixin
Zhou, Xiang-Feng
Wang, Hui-Tian
Xu, Jing-Jun
Li, Jingbo
Wang, E. G.
Wei, Su-Huai
TI Origin of insulating behavior of the p-type LaAlO3/SrTiO3 interface:
Polarization-induced asymmetric distribution of oxygen vacancies
SO PHYSICAL REVIEW B
LA English
DT Article
ID INITIO MOLECULAR-DYNAMICS; ELECTRON GASES; HETEROSTRUCTURES; TRANSITION
AB It is revealed from first-principles calculations that polarization-induced asymmetric distribution of oxygen vacancies plays an important role in the insulating behavior at p-type LaAlO3/SrTiO3 interface. The formation energy of the oxygen vacancy (V-O) is much smaller than that at the surface of the LaAlO3 overlayer, causing all the carriers to be compensated by the spontaneously formed V-O's at the interface. In contrast, at an n-type interface, the formation energy of V-O is much higher than that at the surface, and the V-O's formed at the surface enhance the carrier density at the interface. This explains the puzzling behavior of why the p-type interface is always insulating but the n-type interface can be conducting.
C1 [Zhang, Lixin; Zhou, Xiang-Feng; Wang, Hui-Tian; Xu, Jing-Jun] Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China.
[Zhang, Lixin; Wei, Su-Huai] Natl Renewable Energy Lab, Golden, CO 80401 USA.
[Li, Jingbo] Chinese Acad Sci, Inst Semicond, Beijing 100083, Peoples R China.
[Wang, E. G.] Peking Univ, Sch Phys, Beijing 100871, Peoples R China.
RP Zhang, LX (reprint author), Nankai Univ, Sch Phys, Tianjin 300071, Peoples R China.
RI Zhou, Xiang-Feng/A-1714-2010; Wang, Hui-Tian/B-8406-2009
OI Zhou, Xiang-Feng/0000-0001-8651-9273;
FU Nankai University in P. R. China; U.S. DOE [DE-AC36-08GO28308]
FX The work is supported by the start-up grant to Lixin Zhang from Nankai
University in P. R. China. The work at NREL is supported by the U.S. DOE
under Contract No. DE-AC36-08GO28308.
NR 23
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U2 26
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 SEP 9
PY 2010
VL 82
IS 12
AR 125412
DI 10.1103/PhysRevB.82.125412
PG 4
WC Physics, Condensed Matter
SC Physics
GA 647ZD
UT WOS:000281658500008
ER
PT J
AU Aamodt, K
Abel, N
Abeysekara, U
Quintana, AA
Abramyan, A
Adamova, D
Aggarwal, MM
Rinella, GA
Agocs, AG
Salazar, SA
Ahammed, Z
Ahmad, A
Ahmad, N
Ahn, SU
Akimoto, R
Akindinov, A
Aleksandrov, D
Alessandro, B
Molina, RA
Alici, A
Avina, EA
Alme, J
Alt, T
Altini, V
Altinpinar, S
Andrei, C
Andronic, A
Anelli, G
Angelov, V
Anson, C
Anticic, T
Antinori, F
Antinori, S
Antipin, K
Antonczyk, D
Antonioli, P
Anzo, A
Aphecetche, L
Appelshauser, H
Arcelli, S
Arceo, R
Arend, A
Armesto, N
Arnaldi, R
Aronsson, T
Arsene, IC
Asryan, A
Augustinus, A
Averbeck, R
Awes, TC
Aysto, J
Azmi, MD
Bablok, S
Bach, M
Badala, A
Baek, YW
Bagnasco, S
Bailhache, R
Bala, R
Baldisseri, A
Baldit, A
Ban, J
Barbera, R
Barnafoldi, GG
Barnby, LS
Barret, V
Bartke, J
Barile, F
Basile, M
Basmanov, V
Bastid, N
Bathen, B
Batigne, G
Batyunya, B
Baumann, C
Bearden, IG
Becker, B
Belikov, I
Bellwied, R
Belmont-Moreno, E
Belogianni, A
Benhabib, L
Beole, S
Berceanu, I
Bercuci, A
Berdermann, E
Berdnikov, Y
Betev, L
Bhasin, A
Bhati, AK
Bianchi, L
Bianchi, N
Bianchin, C
Bielcik, J
Bielcikova, J
Bilandzic, A
Bimbot, L
Biolcati, E
Blanc, A
Blanco, F
Blanco, F
Blau, D
Blume, C
Boccioli, M
Bock, N
Bogdanov, A
Boggild, H
Bogolyubsky, M
Bohm, J
Boldizsar, L
Bombara, M
Bombonati, C
Bondila, M
Borel, H
Borisov, A
Bortolin, C
Bose, S
Bosisio, L
Bossu, F
Botje, M
Bottger, S
Bourdaud, G
Boyer, B
Braun, M
Braun-Munzinger, P
Bravina, L
Bregant, M
Breitner, T
Bruckner, G
Brun, R
Bruna, E
Bruno, GE
Budnikov, D
Buesching, H
Buncic, P
Busch, O
Buthelezi, Z
Caffarri, D
Cai, X
Caines, H
Calvo, E
Camacho, E
Camerini, P
Campbell, M
Roman, VC
Capitani, GP
Romeo, GC
Carena, F
Carena, W
Carminati, F
Diaz, AC
Caselle, M
Castellanos, JC
Hernandez, JFC
Catanescu, V
Cattaruzza, E
Cavicchioli, C
Cerello, P
Chambert, V
Chang, B
Chapeland, S
Charpy, A
Charvet, JL
Chattopadhyay, S
Chattopadhyay, S
Cherney, M
Cheshkov, C
Cheynis, B
Chiavassa, E
Barroso, VC
Chinellato, DD
Chochula, P
Choi, K
Chojnacki, M
Christakoglou, P
Christensen, CH
Christiansen, P
Chujo, T
Chuman, F
Cicalo, C
Cifarelli, L
Cindolo, F
Cleymans, J
Cobanoglu, O
Coffin, JP
Coli, S
Colla, A
Balbastre, GC
del Valle, ZC
Conner, ES
Constantin, P
Contin, G
Contreras, JG
Morales, YC
Cormier, TM
Cortese, P
Maldonado, IC
Cosentino, MR
Costa, F
Cotallo, ME
Crescio, E
Crochet, P
Cuautle, E
Cunqueiro, L
Cussonneau, J
Dainese, A
Dalsgaard, HH
Danu, A
Das, I
Dash, A
Dash, S
de Barros, GOV
De Caro, A
de Cataldo, G
de Cuveland, J
De Falco, A
De Gaspari, M
de Groot, J
De Gruttola, D
De Marco, N
De Pasquale, S
De Remigis, R
De Rooij, R
de Vaux, G
Delagrange, H
Delgado, Y
Dellacasa, G
Deloff, A
Demanov, V
Denes, E
Deppman, A
D'Erasmo, G
Derkach, D
Devaux, A
Di Bari, D
Di Giglio, C
Di Liberto, S
Di Mauro, A
Di Nezza, P
Dialinas, M
Diaz, L
Diaz, R
Dietel, T
Divia, R
Djuvsland, O
Dobretsov, V
Dobrin, A
Dobrowolski, T
Donigus, B
Dominguez, I
Don, DMM
Dordic, O
Dubey, AK
Dubuisson, J
Ducroux, L
Dupieux, P
Majumdar, AKD
Majumdar, MRD
Elia, D
Emschermann, D
Enokizono, A
Espagnon, B
Estienne, M
Esumi, S
Evans, D
Evrard, S
Eyyubova, G
Fabjan, CW
Fabris, D
Faivre, J
Falchieri, D
Fantoni, A
Fasel, M
Fateev, O
Fearick, R
Fedunov, A
Fehlker, D
Fekete, V
Felea, D
Fenton-Olsen, B
Feofilov, G
Tellez, AF
Ferreiro, EG
Ferretti, A
Ferretti, R
Figueredo, MAS
Filchagin, S
Fini, R
Fionda, FM
Fiore, EM
Floris, M
Fodor, Z
Foertsch, S
Foka, P
Fokin, S
Formenti, F
Fragiacomo, E
Fragkiadakis, M
Frankenfeld, U
Frolov, A
Fuchs, U
Furano, F
Furget, C
Girard, MF
Gaardhoje, JJ
Gadrat, S
Gagliardi, M
Gago, A
Gallio, M
Ganoti, P
Ganti, MS
Garabatos, C
Trapaga, CG
Gebelein, J
Gemme, R
Germain, M
Gheata, A
Gheata, M
Ghidini, B
Ghosh, P
Giraudo, G
Giubellino, P
Gladysz-Dziadus, E
Glasow, R
Glassel, P
Glenn, A
Jimenez, RG
Santos, HG
Gonzalez-Trueba, LH
Gonzalez-Zamora, P
Gorbunov, S
Gorbunov, Y
Gotovac, S
Gottschlag, H
Grabski, V
Grajcarek, R
Grelli, A
Grigoras, A
Grigoras, C
Grigoriev, V
Grigoryan, A
Grigoryan, S
Grinyov, B
Grion, N
Gros, P
Grosse-Oetringhaus, JF
Grossiord, JY
Grosso, R
Guber, F
Guernane, R
Guerra, C
Guerzoni, B
Gulbrandsen, K
Gulkanyan, H
Gunji, T
Gupta, A
Gupta, R
Gustafsson, HA
Gutbrod, H
Haaland, O
Hadjidakis, C
Haiduc, M
Hamagaki, H
Hamar, G
Hamblen, J
Han, BH
Harris, JW
Hartig, M
Harutyunyan, A
Hasch, D
Hasegan, D
Hatzifotiadou, D
Hayrapetyan, A
Heide, M
Heinz, M
Helstrup, H
Herghelegiu, A
Hernandez, C
Corral, GH
Herrmann, N
Hetland, KF
Hicks, B
Hiei, A
Hille, PT
Hippolyte, B
Horaguchi, T
Hori, Y
Hristov, P
Hrivnacova, I
Hu, S
Huang, M
Huber, S
Humanic, TJ
Hutter, D
Hwang, DS
Ichou, R
Ilkaev, R
Ilkiv, I
Inaba, M
Innocenti, PG
Ippolitov, M
Irfan, M
Ivan, C
Ivanov, A
Ivanov, M
Ivanov, V
Iwasaki, T
Jacholkowski, A
Jacobs, P
Jancurova, L
Jangal, S
Janik, R
Jena, C
Jena, S
Jirden, L
Jones, GT
Jones, PG
Jovanovic, P
Jung, H
Jung, W
Jusko, A
Kaidalov, AB
Kalcher, S
Kalinak, P
Kalisky, M
Kalliokoski, T
Kalweit, A
Kamal, A
Kamermans, R
Kanaki, K
Kang, E
Kang, JH
Kapitan, J
Kaplin, V
Kapusta, S
Karavichev, O
Karavicheva, T
Karpechev, E
Kazantsev, A
Kebschull, U
Keidel, R
Khan, MM
Khan, SA
Khanzadeev, A
Kharlov, Y
Kikola, D
Kileng, B
Kim, DJ
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CA Alice Collaboration
TI Two-pion Bose-Einstein correlations in pp collisions at root s=900 GeV
SO PHYSICAL REVIEW D
LA English
DT Article
ID HEAVY-ION COLLISIONS; INTERFEROMETRY; FEMTOSCOPY; MOMENTUM; HADRON; PION
AB We report on the measurement of two-pion correlation functions from pp collisions at root s = 900 GeV performed by the ALICE experiment at the Large Hadron Collider. Our analysis shows an increase of the Hanbury Brown-Twiss radius with increasing event multiplicity, in line with other measurements done in particle- and nuclear collisions. Conversely, the strong decrease of the radius with increasing transverse momentum, as observed at the Relativistic Heavy Ion Collider and at Tevatron, is not manifest in our data.
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[Altini, V.; Barile, F.; Bruno, G. E.; D'Erasmo, G.; Di Bari, D.; Di Giglio, C.; Fionda, F. M.; Fiore, E. M.; Ghidini, B.; Mastroserio, A.; Minafra, F.; Navach, F.; Perrino, D.; Posa, F.; Romita, R.; Santoro, R.; Sgura, I.; Simonetti, G.; Terrevoli, C.; Volpe, G.] Sezione Ist Nazl Fis Nucl, Bari, Italy.
[Altinpinar, S.; Andronic, A.; Averbeck, R.; Bailhache, R.; Bercuci, A.; Berdermann, E.; Braun-Munzinger, P.; Hernandez, J. F. Castillo; Doenigus, B.; Fasel, M.; Foka, P.; Frankenfeld, U.; Garabatos, C.; Gutbrod, H.; Hernandez, C.; Huber, S.; Ivanov, M.; Knichel, M. L.; Malzacher, P.; Marin, A.; Masciocchi, S.; Miskowiec, D.; Otwinowski, J.; Park, W. J.; Schmidt, C.; Schmidt, H. R.; Schwarz, K.; Soyk, D.; Vranic, D.] GSI Helmholtzzentrum Schwerionenforsch, Div Res, Darmstadt, Germany.
[Altinpinar, S.; Andronic, A.; Averbeck, R.; Bailhache, R.; Bercuci, A.; Berdermann, E.; Braun-Munzinger, P.; Hernandez, J. F. Castillo; Doenigus, B.; Fasel, M.; Foka, P.; Frankenfeld, U.; Garabatos, C.; Gutbrod, H.; Hernandez, C.; Huber, S.; Ivanov, M.; Knichel, M. L.; Malzacher, P.; Marin, A.; Masciocchi, S.; Miskowiec, D.; Otwinowski, J.; Park, W. J.; Schmidt, C.; Schmidt, H. R.; Schwarz, K.; Soyk, D.; Vranic, D.] GSI Helmholtzzentrum Schwerionenforsch, ExtreMe Matter Inst EMMI, Darmstadt, Germany.
[Andrei, C.; Berceanu, I.; Catanescu, V.; Herghelegiu, A.; Petris, M.; Petrovici, M.; Pop, A.; Schiaua, C.] Natl Inst Phys & Nucl Engn, Bucharest, Romania.
[Anson, C.; Bock, N.; Humanic, T. J.; Kisiel, A.; Lisa, M. A.; Truesdale, D.] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA.
[Anticic, T.; Nikolic, V.; Susa, T.] Rudjer Boskovic Inst, Zagreb, Croatia.
[Antipin, K.; Antonczyk, D.; Appelshaeuser, H.; Arend, A.; Blume, C.; Buesching, H.; Hartig, M.; Kliemant, M.; Kniege, S.; Kramer, F.; Lehnert, J.; Leon Vargas, H.; Pitz, N.; Renfordt, R.; Schuchmann, S.; Sommer, W.; Stock, R.; Ulery, J.] Goethe Univ Frankfurt, Inst Kernphys, D-6000 Frankfurt, Germany.
[Aphecetche, L.; Batigne, G.; Benhabib, L.; Bourdaud, G.; del Valle, Z. Conesa; Cussonneau, J.; Delagrange, H.; Dialinas, M.; Estienne, M.; Germain, M.; Ichou, R.; Le Bris, N.; Lefevre, F.; Lenhardt, M.; Luquin, L.; Martinez Garcia, G.; Pillot, P.; Roy, C.; Schutz, Y.; Tournaire, A.; Yermia, F.] Univ Nantes, CNRS, IN2P3, SUBATECH,Ecole Mines Nantes, Nantes, France.
[Armesto, N.; Ferreiro, E. G.; Pajares, C.; Salgado, C. A.] Univ Santiago de Compostela, Dept Fis Particulas, Santiago De Compostela, Spain.
[Armesto, N.; Ferreiro, E. G.; Pajares, C.; Salgado, C. A.] Univ Santiago de Compostela, IGFAE, Santiago De Compostela, Spain.
[Aronsson, T.; Bruna, E.; Caines, H.; Harris, J. W.; Heinz, M.; Hicks, B.; Ma, R.; Putschke, J.; Smirnov, N.] Yale Univ, New Haven, CT USA.
[Asryan, A.; Braun, M.; Derkach, D.; Feofilov, G.; Ivanov, A.; Kolojvari, A.; Kondratiev, V.; Ochirov, A.; Semenov, D.; Vechernin, V.; Vinogradov, L.; Zarochentsev, A.] St Petersburg State Univ, V Fock Inst Phys, St Petersburg, Russia.
[Awes, T. C.; Enokizono, A.; Silvermyr, D.] Oak Ridge Natl Lab, Oak Ridge, TN USA.
[Aysto, J.; Bondila, M.; Diaz, R.; Kalliokoski, T.; Kim, D. J.; Malkiewicz, T.; Novitzky, N.; Oinonen, M.; Raiha, T. S.; Rak, J.; Rasanen, S. S.; Sarkamo, J.; Trzaska, W. H.] HIP, Jyvaskyla, Finland.
[Aysto, J.; Bondila, M.; Diaz, R.; Kalliokoski, T.; Kim, D. J.; Malkiewicz, T.; Novitzky, N.; Oinonen, M.; Raiha, T. S.; Rak, J.; Rasanen, S. S.; Sarkamo, J.; Trzaska, W. H.] Univ Jyvaskyla, Jyvaskyla, Finland.
[Bach, M.; Hutter, D.] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, Frankfurt, Germany.
[Badala, A.; Palmeri, A.; Pappalardo, G. S.] Sezione Ist Nazl Fis Nucl, Catania, Italy.
[Bala, R.; Beole, S.; Bianchi, L.; Biolcati, E.; Bossu, F.; Chiavassa, E.; Cobanoglu, O.; Morales, Y. Corrales; Ferretti, A.; Gagliardi, M.; Gallio, M.; Garcia Trapaga, C.; Luparello, G.; Chiesa, A. Marzari; Masera, M.; Milano, L.; Ortona, G.; Padilla, F.; Poggio, F.; Poghosyan, M. G.; Siciliano, M.; Stocco, D.; Vasquez, M. A. Subieta; Vercellin, E.] Univ Turin, Dipartimento Fis Sperimentale, Turin, Italy.
[Baldisseri, A.; Borel, H.; Castellanos, J. Castillo; Charvet, J. L.; Orsini, F.; Pereira, H.; Rakotozafindrabe, A.; Staley, F.] CEA, IRFU, Saclay, France.
[Baldit, A.; Barret, V.; Bastid, N.; Blanc, A.; Crochet, P.; Devaux, A.; Dupieux, P.; Lopez, X.; Manceau, L.; Manso, F.; Rosnet, P.; Saturnini, P.; Vulpescu, B.] Univ Blaise Pascal, CNRS, IN2P3, Clermont Univ,LPC, Clermont Ferrand, France.
[Ban, J.; Kalinak, P.; Kralik, I.; Pastircak, B.; Sandor, L.] Slovak Acad Sci, Inst Expt Phys, Kosice 04353, Slovakia.
[Barbera, R.; Blanco, F.; La Rocca, P.; Petta, C.; Pulvirenti, A.; Riggi, F.; Vernet, R.] Univ Catania, Dipartimento Fis Astron, Catania, Italy.
[Barbera, R.; Blanco, F.; La Rocca, P.; Petta, C.; Pulvirenti, A.; Riggi, F.; Vernet, R.] Sezione Ist Nazl Fis Nucl, Catania, Italy.
[Barnby, L. S.; Evans, D.; Jones, G. T.; Jones, P. G.; Jovanovic, P.; Jusko, A.; Kour, R.; Krivda, M.; Lazzeroni, C.; Lietava, R.; Matthews, Z. L.; Navin, S.; Palaha, A.; Petrov, P.; Platt, R.; Scott, P. A.; Snow, H.; Baillie, O. Villalobos] Univ Birmingham, Sch Phys & Astron, Birmingham, W Midlands, England.
[Bartke, J.; Gladysz-Dziadus, E.; Kornas, E.; Kowalski, M.; Matyja, A.; Rybicki, A.] Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, Krakow, Poland.
[Basmanov, V.; Budnikov, D.; Demanov, V.; Filchagin, S.; Ilkaev, R.; Kuryakin, A.; Mamonov, A.; Nazarenko, S.; Nazarov, G.; Punin, A.; Punin, V.; Tumkin, A.; Vikhlyantsev, O.; Vinogradov, Y.] Russian Fed Nucl Ctr VNIIEF, Sarov, Russia.
[Bathen, B.; Baumann, C.; Dietel, T.; Glasow, R.; Gottschlag, H.; Heide, M.; Kalisky, M.; Rammler, M.; Reygers, K.; Santo, R.; Wessels, J.; Westerhoff, U.; Wilk, A.] Univ Munster, Inst Kernphys, D-4400 Munster, Germany.
[Batyunya, B.; Fateev, O.; Fedunov, A.; Grigoryan, S.; Jancurova, L.; Kutouski, M.; Malinina, L.; Nomokonov, P.; Pocheptsov, T.; Shabratova, G.; Vala, M.; Vodopianov, A.; Yurevich, V.; Zanevsky, Yu.; Zaporozhets, S.; Zinchenko, A.] JINR, Dubna, Russia.
[Bearden, I. G.; Boggild, H.; Christensen, C. H.; Dalsgaard, H. H.; Fenton-Olsen, B.; Gaardhoje, J. J.; Gulbrandsen, K.; Nielsen, B. S.; Nygaard, C.; Sogaard, C.] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark.
[Becker, B.; Cicalo, C.; Masoni, A.; Siddi, E.; Szostak, A.] Sezione Ist Nazl Fis Nucl, Cagliari, Italy.
[Belikov, I.; Coffin, J. -P.; Hippolyte, B.; Jangal, S.; Kuhn, C.; Lutz, J. -R.; Maire, A.; Michalon, A.] Univ Strasbourg, CNRS, IN2P3, IPHC, Strasbourg, France.
[Bellwied, R.; Cormier, T. M.; Mlynarz, J.; Pavlinov, A.; Pruneau, C. A.; Voloshin, S.] Wayne State Univ, Detroit, MI USA.
[Belogianni, A.; Fragkiadakis, M.; Ganoti, P.; Petridis, A.; Spyropoulou-Stassinaki, M.; Tagridis, C.; Tsilis, E.; Vasileiou, M.] Univ Athens, Dept Phys, Athens, Greece.
[Berdnikov, Y.; Ivanov, V.; Khanzadeev, A.; Kryshen, E.; Malaev, M.; Miftakhov, N.; Nikulin, V.; Polyakov, V.; Samsonov, V.; Zalite, A.; Zhalov, M.] Petersburg Nucl Phys Inst, Gatchina, Russia.
[Bhasin, A.; Gupta, A.; Gupta, R.; Lal, C.; Mangotra, L.; Potukuchi, B.; Sambyal, S.; Sharma, S.; Singh, R.] Univ Jammu, Dept Phys, Jammu 180004, India.
[Bianchi, N.; Capitani, G. P.; Diaz, A. Casanova; Balbastre, G. Conesa; Cunqueiro, L.; Di Nezza, P.; Fantoni, A.; Hasch, D.; Muccifora, V.; Reolon, A. R.; Ronchetti, F.] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy.
[Bianchin, C.; Bombonati, C.; Bortolin, C.; Caffarri, D.; Lunardon, M.; Morando, M.; Moretto, S.; Sahoo, R.; Scarlassara, F.; Segato, G.; Soramel, F.; Viesti, G.] Univ Padua, Dipartimento Fis, Padua, Italy.
[Bianchin, C.; Bombonati, C.; Bortolin, C.; Caffarri, D.; Lunardon, M.; Morando, M.; Moretto, S.; Sahoo, R.; Scarlassara, F.; Segato, G.; Soramel, F.; Viesti, G.] Sezione Ist Nazl Fis Nucl, Padua, Italy.
[Bielcik, J.; Kral, J.; Krus, M.; Pachr, M.; Petracek, V.; Pospisil, V.; Smakal, R.; Tlusty, D.; Wagner, V.; Zychacek, V.] Czech Tech Univ, Fac Nucl Sci & Phys Engn, CR-11519 Prague, Czech Republic.
[Bilandzic, A.; Botje, M.; Krzewicki, M.; Kuijer, P. G.; Snellings, R.; van der Kolk, N.] Natl Inst Subatom Phys, Amsterdam, Netherlands.
[Bimbot, L.; Boyer, B.; Chambert, V.; Charpy, A.; Espagnon, B.; Hadjidakis, C.; Hrivnacova, I.; Lafage, V.; Le Bornec, Y.; Lopez Noriega, M.; Malek, M.; Peyre, J.; Pouthas, J.; Rousseau, S.; Suire, C.; Takaki, J. D. Tapia; Willis, N.] Univ Paris 11, CNRS, IN2P3, IPNO, F-91405 Orsay, France.
[Blanco, F.; Cotallo, M. E.; Gonzalez-Zamora, P.; Ladron de Guevara, P.; Montes, E.; Rubio-Montero, A. J.; Serradilla, E.] CIEMAT, E-28040 Madrid, Spain.
[Bogdanov, A.; Grigoriev, V.; Kaplin, V.; Kondratyeva, N.; Loginov, V.] Moscow Engn Phys Inst, Moscow 115409, Russia.
[Bogolyubsky, M.; Kharlov, Y.; Kim, J.; Polichtchouk, B.; Sadovsky, S.; Soloviev, A.; Stolpovsky, P.; Zenin, A.] Inst High Energy Phys, Protvino, Russia.
[Bohm, J.; Chang, B.; Kang, J. H.; Kim, M.; Kim, Y.; Kwon, Y.; Song, M.] Yonsei Univ, Seoul 120749, South Korea.
[Bombara, M.; Kravcakova, A.; Putis, M.; Urban, J.; Vrlakova, J.] Safarik Univ, Fac Sci, Kosice, Slovakia.
[Borisov, A.; Grinyov, B.; Zinovjev, G.; Zynovyev, M.] Bogolyubov Inst Theoret Phys, Kiev, Ukraine.
[Bose, S.; Chattopadhyay, S.; Das, I.; Majumdar, A. K. Dutta; Pal, S.; Roy, P.; Sinha, T.] Saha Inst Nucl Phys, Kolkata, India.
[Bosisio, L.; Bregant, M.; Camerini, P.; Cattaruzza, E.; Contin, G.; Margagliotti, G. V.; Rossi, A.; Rui, R.; Venaruzzo, M.] Univ Trieste, Dipartimento Fis, Trieste, Italy.
[Bosisio, L.; Bregant, M.; Camerini, P.; Cattaruzza, E.; Contin, G.; Margagliotti, G. V.; Rossi, A.; Rui, R.; Venaruzzo, M.] Sezione Ist Nazl Fis Nucl, Trieste, Italy.
[Braun-Munzinger, P.; Kalweit, A.; Kraus, I.; Mager, M.; Oeschler, H.; Ricaud, H.] Tech Univ Darmstadt, Inst Kernphys, Darmstadt, Germany.
[Busch, O.; Constantin, P.; De Gaspari, M.; Emschermann, D.; Glaessel, P.; Grajcarek, R.; Herrmann, N.; Klein, J.; Koch, K.; Krumbhorn, D.; Kweon, M. J.; Mercado Perez, J.; Oyama, K.; Pachmayer, Y.; Radomski, S.; Rusanov, I.; Schicker, R.; Schweda, K.; Soltveit, H. K.; Stachel, J.; Tsiledakis, G.; Vallero, S.; Wang, Y.; Wiechula, J.; Windelband, B.; Yang, H.] Heidelberg Univ, Inst Phys, D-6900 Heidelberg, Germany.
[Buthelezi, Z.; Cleymans, J.; de Vaux, G.; Fearick, R.; Foertsch, S.; Steyn, G.; Vilakazi, Z.] Univ Cape Town, Dept Phys, iThemba Labs, ZA-7925 Cape Town, South Africa.
[Cai, X.; Ma, K.; Mao, Y.; Wan, R.; Wang, D.; Wang, Y.; Xu, C.; Yang, C.; Yin, Z.; Yuan, X.; Zhang, X.; Zhou, D.; Zhu, J.] Hua Zhong Normal Univ, Wuhan, Peoples R China.
[Calvo, E.; Delgado, Y.; Gago, A.; Guerra, C.; Perez, C.] Pontificia Univ Catolica Peru, Dept Ciencias, Secc Fis, Lima, Peru.
[Camacho, E.; Contreras, J. G.; Crescio, E.; Corral, G. Herrera; Zetina, L. Montano; Ramirez Reyes, A.; Zepeda, A.] CINVESTAV, Mexico City 14000, DF, Mexico.
[Camacho, E.; Contreras, J. G.; Crescio, E.; Corral, G. Herrera; Zetina, L. Montano; Ramirez Reyes, A.; Zepeda, A.] CINVESTAV, Merida, Mexico.
[Cheynis, B.; Ducroux, L.; Grossiord, J. -Y.; Massacrier, L.; Nendaz, F.; Tieulent, R.; Zoccarato, Y.] Univ Lyon 1, CNRS, IN2P3, IPN Lyon, F-69622 Villeurbanne, France.
[Chinellato, D. D.; Cosentino, M. R.; Takahashi, J.] Univ Estadual Campinas, Campinas, SP, Brazil.
[Choi, K.; Lee, H.; Son, C. W.; Yi, J.; Yoo, I-K.] Pusan Natl Univ, Pusan 609735, South Korea.
[Chojnacki, M.; Christakoglou, P.; De Rooij, R.; Grelli, A.; Ivan, C.; Kamermans, R.; Mischke, A.; Nooren, G.; Peitzmann, T.; Simili, E.; van Leeuwen, M.; Verweij, M.] Univ Utrecht, Inst Subatom Phys, Utrecht, Netherlands.
[Christiansen, P.; Dobrin, A.; Gros, P.; Gustafsson, H. -A.; Oskarsson, A.; Osterman, L.; Otterlund, I.; Stenlund, E.] Lund Univ, Div Expt High Energy Phys, Lund, Sweden.
[Chujo, T.; Esumi, S.; Inaba, M.; Miake, Y.; Sakata, D.; Sano, M.; Shimomura, M.; Tanabe, R.; Watanabe, K.; Yokoyama, H.] Univ Tsukuba, Tsukuba, Ibaraki, Japan.
[Chuman, F.; Hiei, A.; Horaguchi, T.; Iwasaki, T.; Maruyama, Y.; Mizoguchi, K.; Okada, Y.; Shigaki, K.; Sugitate, T.; Torii, H.] Hiroshima Univ, Hiroshima, Japan.
[Conner, E. S.; Keidel, R.] Fachhsch Worms, ZTT, Worms, Germany.
[Cortese, P.; Dellacasa, G.; Ferretti, R.; Gemme, R.; Ramello, L.; Senyukov, S.; Sitta, M.] Univ Piemonte Orientale, Dipartimento Sci & Tecnol Avanzate, Alessandria, Italy.
[Cortese, P.; Dellacasa, G.; Ferretti, R.; Gemme, R.; Ramello, L.; Senyukov, S.; Sitta, M.] Grp Coll INFN, Alessandria, Italy.
[Cortes Maldonado, I.; Fernandez Tellez, A.; Gonzalez Santos, H.; Lopez-Ramirez, R.; Martinez Hernandez, M. I.; Munoz, J.; Cahuantzi, M. Rodriguez; Roman Lopez, S.; Tejeda Munoz, G.; Vargas, A.; Vergara, S.] Benemerita Univ Autonoma Puebla, Puebla, Mexico.
[Cuautle, E.; Diaz, L.; Dominguez, I.; Maldonado Cervantes, I.; Mayani, D.; Ortiz Velasquez, A.; Paic, G.; Peskov, V.; Serkin, L.] Univ Nacl Autonoma Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico.
[Danu, A.; Felea, D.; Haiduc, M.; Hasegan, D.; Mitu, C.; Sevcenco, A.; Stan, E.; Zgura, I.] ISS, Bucharest, Romania.
[Dash, A.; Dash, S.; Jena, C.; Mahapatra, D. P.; Rath, S.] Inst Phys, Bhubaneswar 751007, Orissa, India.
[de Barros, G. O. V.; Deppman, A.; Figueredo, M. A. S.; Soares, A. Lozea Feijo; Munhoz, M. G.; Suaide, A. A. P.; de Toledo, A. Szanto] Univ Sao Paulo, BR-09500900 Sao Paulo, Brazil.
[De Caro, A.; De Gruttola, D.; De Pasquale, S.; Girard, M. Fusco; Pagano, P.; Russo, G.; Virgili, T.] Univ Salerno, Dipartimento Fis ER Caianiello, I-84100 Salerno, Italy.
[De Caro, A.; De Gruttola, D.; De Pasquale, S.; Girard, M. Fusco; Pagano, P.; Russo, G.; Virgili, T.] Sezione Ist Nazl Fis Nucl, Salerno, Italy.
[de Cataldo, G.; Elia, D.; Fini, R.; Lenti, V.; Manzari, V.; Mastromarco, M.; Nappi, E.; Nicassio, M.; Pastore, C.; Paticchio, V.] Sezione Ist Nazl Fis Nucl, Bari, Italy.
[De Falco, A.; Floris, M.; Puddu, G.; Serci, S.; Uras, A.; Usai, G. L.] Univ Cagliari, Dipartimento Fis, Cagliari, Italy.
[De Falco, A.; Floris, M.; Puddu, G.; Serci, S.; Uras, A.; Usai, G. L.] Sezione Ist Nazl Fis Nucl, Cagliari, Italy.
[Deloff, A.; Dobrowolski, T.; Ilkiv, I.; Kurashvili, P.; Redlich, K.; Siemiarczuk, T.; Stefanek, G.; Wilk, G.] Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland.
[Di Liberto, S.; Mazzoni, M. A.; Urciuoli, G. M.] Sezione Ist Nazl Fis Nucl, Rome, Italy.
[Don, D. M. M.; Madagodahettige-Don, D. M.; Pinsky, L.] Univ Houston, Houston, TX USA.
[Faivre, J.; Furget, C.; Gadrat, S.; Guernane, R.; Kox, S.; Real, J. S.] Univ Grenoble 1, CNRS, IN2P3, Inst Polytech Grenoble,LPSC, Grenoble, France.
[Fekete, V.; Janik, R.; Pikna, M.; Sitar, B.; Strmen, P.; Szarka, I.] Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia.
[Frolov, A.; Pestov, Y.] Budker Inst Nucl Phys, Novosibirsk 630090, Russia.
[Glenn, A.; Newby, J.; Soltz, R.] Lawrence Livermore Natl Lab, Livermore, CA USA.
[Gomez Jimenez, R.; Leon Monzon, I.; Podesta Lerma, P. L. M.] Univ Autonoma Sinaloa, Culiacan, Mexico.
[Gotovac, S.; Mudnic, E.; Vickovic, L.] Tech Univ Split FESB, Split, Croatia.
[Guber, F.; Karavichev, O.; Karavicheva, T.; Karpechev, E.; Konevskih, A.; Kurepin, A.; Kurepin, A. N.; Maevskaya, A.; Pshenichnov, I.; Reshetin, A.] Acad Sci, Inst Nucl Res, Moscow, Russia.
[Hamblen, J.; Martashvili, I.; Read, K. F.] Univ Tennessee, Knoxville, TN USA.
[Han, B. H.; Hwang, D. S.; Kim, J. H.; Kim, S.; Son, H.] Sejong Univ, Dept Phys, Seoul, South Korea.
[Helstrup, H.; Hetland, K. F.; Kileng, B.; Roed, K.] Bergen Univ Coll, Fac Engn, Bergen, Norway.
[Hu, S.; Li, X.; Li, Y.; Lu, S.; Wen, Q.; Zhou, S.] China Inst Atom Energy, Beijing, Peoples R China.
[Jacobs, P.; Odyniec, G.; Ploskon, M.; Salur, S.; Symons, J.] Lawrence Berkeley Natl Lab, Berkeley, CA USA.
[Jena, S.; Nandi, B. K.; Nyatha, A.; Pujahari, P.; Varma, R.] Indian Inst Technol, Mumbai 400076, Maharashtra, India.
[Kikola, D.; Kupczak, R.; Oleniacz, J.; Ostrowski, P.; Pawlak, T.; Peryt, W.; Pluta, J.; Szuba, M.; Traczyk, T.; Zbroszczyk, H.] Warsaw Univ Technol, Warsaw, Poland.
[Klay, J. L.] Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA 93407 USA.
[Krawutschke, T.] Fachhsch Koln, Cologne, Germany.
[Mares, J.; Polak, K.; Zavada, P.] Acad Sci Czech Republic, Inst Phys, Prague, Czech Republic.
[Meddi, F.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy.
[Raniwala, R.; Raniwala, S.] Univ Rajasthan, Dept Phys, Jaipur 302004, Rajasthan, India.
[Ricci, R. A.; Vannucci, L.] Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.
[Scharenberg, R. P.; Srivastava, B. K.] Purdue Univ, W Lafayette, IN 47907 USA.
RP Aamodt, K (reprint author), Univ Oslo, Dept Phys, Oslo, Norway.
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Andrey/J-6253-2013; Kondratiev, Valery/J-8574-2013; Barnafoldi, Gergely
Gabor/L-3486-2013; Castillo Castellanos, Javier/G-8915-2013; Levai,
Peter/A-1544-2014; Guber, Fedor/I-4271-2013; Martinez Davalos,
Arnulfo/F-3498-2013; Cortese, Pietro/G-6754-2012; SCAPPARONE,
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stefania/G-9353-2012; Yoo, In-Kwon/J-6222-2012; Turrisi,
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Christian/D-6461-2012; Peitzmann, Thomas/K-2206-2012; Felea,
Daniel/C-1885-2012; Deppman, Airton/F-6332-2010; Sevcenco,
Adrian/C-1832-2012; Pshenichnov, Igor/A-4063-2008; Chinellato,
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Javier/0000-0002-5187-2779; Guber, Fedor/0000-0001-8790-3218; Martinez
Davalos, Arnulfo/0000-0002-9481-9548; Aglieri Rinella,
Gianluca/0000-0002-9611-3696; Christensen,
Christian/0000-0002-1850-0121; Peitzmann, Thomas/0000-0002-7116-899X;
Felea, Daniel/0000-0002-3734-9439; Deppman, Airton/0000-0001-9179-6363;
Sevcenco, Adrian/0000-0002-4151-1056; Pshenichnov,
Igor/0000-0003-1752-4524; Chinellato, David/0000-0002-9982-9577;
Barbera, Roberto/0000-0001-5971-6415; Barnby, Lee/0000-0001-7357-9904;
Christensen, Christian Holm/0000-0002-1850-0121; Takahashi,
Jun/0000-0002-4091-1779; Cosentino, Mauro/0000-0002-7880-8611; Vacchi,
Andrea/0000-0003-3855-5856; Bearden, Ian/0000-0003-2784-3094; Sumbera,
Michal/0000-0002-0639-7323; Usai, Gianluca/0000-0002-8659-8378; Salgado,
Carlos A./0000-0003-4586-2758; BRAUN, MIKHAIL/0000-0001-7398-7801;
Vechernin, Vladimir/0000-0003-1458-8055; De Pasquale,
Salvatore/0000-0001-9236-0748; de Cuveland, Jan/0000-0003-0455-1398;
Kutouski, Mikalai/0000-0002-2920-8775; Kurepin,
Alexey/0000-0002-1851-4136; Jena, Satyajit/0000-0002-6220-6982;
Akindinov, Alexander/0000-0002-7388-3022; Suaide,
Alexandre/0000-0003-2847-6556; van der Kolk, Naomi/0000-0002-8670-0408;
Deppman, Airton/0000-0001-9179-6363; Ferreiro,
Elena/0000-0002-4449-2356; Armesto, Nestor/0000-0003-0940-0783; Martinez
Hernandez, Mario Ivan/0000-0002-8503-3009; Ferretti,
Alessandro/0000-0001-9084-5784; Graciani Diaz,
Ricardo/0000-0001-7166-5198; Vickovic, Linda/0000-0002-9820-7960;
Fernandez Tellez, Arturo/0000-0003-0152-4220; Vinogradov,
Leonid/0000-0001-9247-6230; Mohanty, Bedangadas/0000-0001-9610-2914;
Riggi, Francesco/0000-0002-0030-8377; Gago Medina, Alberto
Martin/0000-0002-0019-9692; Dainese, Andrea/0000-0002-2166-1874;
Paticchio, Vincenzo/0000-0002-2916-1671; Monteno,
Marco/0000-0002-3521-6333; Bhasin, Anju/0000-0002-3687-8179; SANTORO,
ROMUALDO/0000-0002-4360-4600; Scarlassara, Fernando/0000-0002-4663-8216;
Turrisi, Rosario/0000-0002-5272-337X; D'Erasmo,
Ginevra/0000-0003-3407-6962; Tosello, Flavio/0000-0003-4602-1985;
Beole', Stefania/0000-0003-4673-8038
FU Lisbon and Swiss Fonds Kidagan, Armenia; Conselho Nacional de
Desenvolvimento Cientifico e Tecnologico (CNPq); Financiadora de Estudos
e Projetos (FINEP); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo
(FAPESP); National Natural Science Foundation of China (NSFC); Chinese
Ministry of Education (CMOE); Ministry of Science and Technology of
China (MSTC); Ministry of Education and Youth of the Czech Republic;
Danish Natural Science Research Council; Carlsberg Foundation; European
Research Council under the European Community; Helsinki Institute of
Physics; German BMBF; Helmholtz Association; Hungarian OTKA; National
Office for Research and Technology (NKTH); Department of Science and
Technology of the Government of India; Istituto Nazionale di Fisica
Nucleare (INFN) of Italy; MEXT, Japan; Joint Institute for Nuclear
Research, Dubna; Korea Foundation for International Cooperation of
Science and Technology (KICOS); Danish National Research Foundation;
Academy of Finland; Department of Atomic Energy of the Government of
India
FX The ALICE collaboration would like to thank all its engineers and
technicians for their invaluable contributions to the construction of
the experiment and the CERN accelerator teams for the outstanding
performance of the LHC complex. The ALICE collaboration acknowledges the
following funding agencies for their support in building and running the
ALICE detector: Calouste Gulbenkian Foundation from Lisbon and Swiss
Fonds Kidagan, Armenia; Conselho Nacional de Desenvolvimento Cientifico
e Tecnologico (CNPq), Financiadora de Estudos e Projetos (FINEP),
Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP); National
Natural Science Foundation of China (NSFC), the Chinese Ministry of
Education (CMOE) and the Ministry of Science and Technology of China
(MSTC); Ministry of Education and Youth of the Czech Republic; Danish
Natural Science Research Council, the Carlsberg Foundation and the
Danish National Research Foundation; The European Research Council under
the European Community's Seventh Framework Programme; Helsinki Institute
of Physics and the Academy of Finland; French CNRS-IN2P3, the 'Region
Pays de Loire,'' "Region Alsace,'' "Region Auvergne,'' and CEA, France;
German BMBF and the Helmholtz Association; Hungarian OTKA and National
Office for Research and Technology (NKTH); Department of Atomic Energy
and Department of Science and Technology of the Government of India;
Istituto Nazionale di Fisica Nucleare (INFN) of Italy; MEXT Grant-in-Aid
for Specially Promoted Research, Japan; Joint Institute for Nuclear
Research, Dubna;Korea Foundation for International Cooperation of
Science and Technology (KICOS); CONACYT, DGAPA, Mexico, ALFA-EC and the
HELEN Program (High-Energy physics Latin American European Network);
Stichting voor Fundamenteel Onderzoek der Materie (FOM) and the
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO),
Netherlands; Research Council of Norway (NFR); Polish Ministry of
Science and Higher Education; National Authority for Scientific
Research-NASR (Autoritatea Nat, ionala. pentru Cercetare S, tiint,
ifica. -ANCS); Federal Agency of Science of the Ministry of Education
and Science of Russian Federation, International Science and Technology
Center, Russian Academy of Sciences, Russian Federal Agency of Atomic
Energy, Russian Federal Agency for Science and Innovations and
CERN-INTAS; Ministry of Education of Slovakia; CIEMAT, EELA, Ministerio
de Educacion y Ciencia of Spain, Xunta de Galicia (Conselleria de
Educaci ' on), CEADEN, Cubaenergia, Cuba, and IAEA (International Atomic
Energy Agency); Swedish Reseach Council (VR) and Knut & Alice Wallenberg
Foundation (KAW); Ukraine Ministry of Education and Science; United
Kingdom Science and Technology Facilities Council (STFC); The United
States Department of Energy, the United States National Science
Foundation, the State of Texas, and the State of Ohio.
NR 32
TC 48
Z9 50
U1 3
U2 45
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 SEP 9
PY 2010
VL 82
IS 5
AR 052001
DI 10.1103/PhysRevD.82.052001
PG 14
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 647ZG
UT WOS:000281658800001
ER
PT J
AU Graham, PW
Harnik, R
Rajendran, S
Saraswat, P
AF Graham, Peter W.
Harnik, Roni
Rajendran, Surjeet
Saraswat, Prashant
TI Exothermic dark matter
SO PHYSICAL REVIEW D
LA English
DT Article
ID DAMA/LIBRA; LIMITS; SUN
AB We propose a novel mechanism for dark matter to explain the observed annual modulation signal at DAMA/LIBRA which avoids existing constraints from every other dark matter direct detection experiment including CRESST, CDMS, and XENON10. The dark matter consists of at least two light states with mass similar to few GeV and splittings similar to 5 keV. It is natural for the heavier states to be cosmologically long-lived and to make up an O(1) fraction of the dark matter. Direct detection rates are dominated by the exothermic reactions in which an excited dark matter state downscatters off of a nucleus, becoming a lower energy state. In contrast to (endothermic) inelastic dark matter, the most sensitive experiments for exothermic dark matter are those with light nuclei and low threshold energies. Interestingly, this model can also naturally account for the observed low-energy events at CoGeNT. The only significant constraint on the model arises from the DAMA/LIBRA unmodulated spectrum but it can be tested in the near future by a low-threshold analysis of CDMS-Si and possibly other experiments including CRESST, COUPP, and XENON100.
C1 [Graham, Peter W.; Saraswat, Prashant] Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
[Harnik, Roni] Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA.
[Rajendran, Surjeet] MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA.
[Rajendran, Surjeet] MIT, Dept Phys, Cambridge, MA 02139 USA.
RP Graham, PW (reprint author), Stanford Univ, Dept Phys, Stanford, CA 94305 USA.
OI Graham, Peter/0000-0002-1600-1601
FU DOE Office of Nuclear Physics [DE-FG02-94ER40818]; NSF [PHY-0600465,
0756174]; Stanford Institute for Theoretical Physics; United States
Department of Energy [DE-AC02-07CH11359]
FX We would like to thank Yang Bai, Blas Cabrera, Savas Dimopoulos, Sergei
Dubovsky, David E. Kaplan, Joachim Kopp, Chris McCabe, Matthew
McCullough, John March-Russell, Jesse Thaler, Natalia Toro, and Jay
Wacker for useful discussions. We are particularly grateful to Peter
Sorensen for discussions on the cuts employed by XENON10 at low
energies. We also thank Jeter Hall for comments on channeling in Ge
crystals. S. R. is supported by the DOE Office of Nuclear Physics under
Grant No. DE-FG02-94ER40818. S. R. is also supported by NSF Grant No.
PHY-0600465. P. S. is supported by the Stanford Institute for
Theoretical Physics and NSF Grant No. 0756174. Fermilab is operated by
Fermi Research Alliance, LLC, under Contract No. DE-AC02-07CH11359 with
the United States Department of Energy.
NR 60
TC 60
Z9 60
U1 0
U2 1
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
EI 1550-2368
J9 PHYS REV D
JI Phys. Rev. D
PD SEP 9
PY 2010
VL 82
IS 6
AR 063512
DI 10.1103/PhysRevD.82.063512
PG 13
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 647ZI
UT WOS:000281659000002
ER
PT J
AU Kane, G
Kumar, P
Shao, J
AF Kane, Gordon
Kumar, Piyush
Shao, Jing
TI CP-violating phases in M theory and implications for electric dipole
moments
SO PHYSICAL REVIEW D
LA English
DT Article
ID SUPERSYMMETRIC STANDARD MODEL; QUANTUM CHROMODYNAMICS; SPLIT
SUPERSYMMETRY; N=1 SUPERGRAVITY; NEUTRON; MSSM; BARYOGENESIS;
CONSTRAINTS; MANIFOLDS; BREAKING
AB We demonstrate that in effective theories arising from a class of N = 1 fluxless compactifications of M theory on a G(2) manifold with low-energy supersymmetry, CP-violating phases do not appear in the soft-breaking Lagrangian except via the Yukawas appearing in the trilinear parameters. Such a mechanism may be present in other string compactifications as well; we describe properties sufficient for this to occur. CP violation is generated via the Yukawas since the soft trilinear matrices are generically not proportional to the Yukawa matrices. Within the framework considered, the estimated theoretical upper bounds for electric dipole moments of the electron, the neutron, and mercury are all within the current experimental limits and could be probed in the near future.
C1 [Kane, Gordon; Shao, Jing] Michigan Ctr Theoret Phys, Ann Arbor, MI 48109 USA.
[Kumar, Piyush] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Kumar, Piyush] Univ Calif Berkeley, Lawrence Berkeley Lab, Theoret Phys Grp, Berkeley, CA 94720 USA.
RP Kane, G (reprint author), Michigan Ctr Theoret Phys, Ann Arbor, MI 48109 USA.
FU Department of Energy [DE-AC02-05CH11231]; NSF [PHY-04-57315]
FX We would like to thank Bobby Acharya, Nima Arkani-Hamed, Konstantin
Bobkov, Jacob Bourjaily, Lisa Everett, Eric Kuflik, Arjun Menon, Brent
Nelson, Aaron Pierce, and Liantao Wang for useful discussions. P. K.
would also like to thank the Michigan Center for Theoretical Physics
(MCTP) for its hospitality where part of the research was conducted. The
work of G. K. and J. S. is supported in part by the Department of
Energy. The work of P. K. is supported by the DOE under Contract No.
DE-AC02-05CH11231 and NSF Grant No. PHY-04-57315.
NR 64
TC 9
Z9 9
U1 0
U2 0
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1550-7998
EI 1550-2368
J9 PHYS REV D
JI Phys. Rev. D
PD SEP 9
PY 2010
VL 82
IS 5
AR 055005
DI 10.1103/PhysRevD.82.055005
PG 15
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 647ZG
UT WOS:000281658800004
ER
PT J
AU Rubenstein, BM
Gubernatis, JE
Doll, JD
AF Rubenstein, B. M.
Gubernatis, J. E.
Doll, J. D.
TI Comparative Monte Carlo efficiency by Monte Carlo analysis
SO PHYSICAL REVIEW E
LA English
DT Article
ID COMPUTATION; MATRIX
AB We propose a modified power method for computing the subdominant eigenvalue lambda(2) of a matrix or continuous operator. While useful both deterministically and stochastically, we focus on defining simple Monte Carlo methods for its application. The methods presented use random walkers of mixed signs to represent the subdominant eigenfunction. Accordingly, the methods must cancel these signs properly in order to sample this eigenfunction faithfully. We present a simple procedure to solve this sign problem and then test our Monte Carlo methods by computing lambda(2) of various Markov chain transition matrices. As vertical bar lambda(2)vertical bar of this matrix controls the rate at which Monte Carlo sampling relaxes to a stationary condition, its computation also enabled us to compare efficiencies of several Monte Carlo algorithms as applied to two quite different types of problems. We first computed lambda(2) for several one-and two-dimensional Ising models, which have a discrete phase space, and compared the relative efficiencies of the Metropolis and heat-bath algorithms as functions of temperature and applied magnetic field. Next, we computed lambda(2) for a model of an interacting gas trapped by a harmonic potential, which has a mutidimensional continuous phase space, and studied the efficiency of the Metropolis algorithm as a function of temperature and the maximum allowable step size Delta. Based on the lambda(2) criterion, we found for the Ising models that small lattices appear to give an adequate picture of comparative efficiency and that the heat-bath algorithm is more efficient than the Metropolis algorithm only at low temperatures where both algorithms are inefficient. For the harmonic trap problem, we found that the traditional rule of thumb of adjusting Delta so that the Metropolis acceptance rate is around 50% is often suboptimal. In general, as a function of temperature or Delta, lambda(2) for this model displayed trends defining optimal efficiency that the acceptance ratio does not. The cases studied also suggested that Monte Carlo simulations for a continuum model are likely more efficient than those for a discretized version of the model.
C1 [Rubenstein, B. M.] Columbia Univ, Dept Chem, New York, NY 10027 USA.
[Gubernatis, J. E.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Doll, J. D.] Brown Univ, Dept Chem, Providence, RI 02912 USA.
RP Rubenstein, BM (reprint author), Columbia Univ, Dept Chem, New York, NY 10027 USA.
FU DOE [DE-FG02-97ER25308]; NSF
FX J.D.D. and J.E.G. gratefully acknowledge joint grant support of this
research through the DOE Multiscale Mathematics and Optimization for
Complex Systems Program. The work of B. M. R. was supported by the NSF
and DOE Grant No. DE-FG02-97ER25308.
NR 16
TC 0
Z9 0
U1 1
U2 2
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 SEP 9
PY 2010
VL 82
IS 3
AR 036701
DI 10.1103/PhysRevE.82.036701
PN 2
PG 10
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 647ZM
UT WOS:000281659400004
PM 21230207
ER
PT J
AU Shiltsev, V
AF Shiltsev, Vladimir
TI Review of observations of ground diffusion in space and in time and
fractal model of ground motion
SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
LA English
DT Article
ID COLLIDERS; LAW
AB We present numerous observations of the diffusive motion of the ground and tunnels for scientific instruments and show that if systematic movements are excluded the remaining uncorrelated component of the motion obeys a characteristic fractal law with the displacement variance dY(2) scaling with time and spatial intervals T and L as dY(2) proportional to T(alpha) L(gamma) with both exponents close to 1 (alpha approximate to gamma approximate to 1). We briefly describe experimental methods of the mesoscopic and microscopic ground motion detection used in measurements at physics research facilities sensitive to ground motion, particularly large high energy elementary particle accelerators. A simple mathematical model of the fractal motion demonstrating the observed scaling law is also presented and discussed. This paper is a subsequent full detail publication to [V. Shiltsev, Phys. Rev. Lett. 104, 238501 (2010)].
C1 Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA.
RP Shiltsev, V (reprint author), Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA.
FU United States Department of Energy [DE-AC02-07CH11359]
FX The author acknowledges very fruitful long-term collaboration on the
development of HLS probes suitable for the ground motion studies for
large accelerators and series of the studies with them at various places
within the FNAL-SLAC-BINP team (Batavia-Stanford-Novosibirsk) of B.
Baklakov, A. Chupyra, A. Erokhin, J. Lach, A. Medvedko, M. Kondaurov, V.
Parkhomchuk, S. Singatulin, A. Seryi, E. Shubin, and J. Volk. I am very
thankful to the collaborators who provided me with numerous records of
raw data for further ground diffusion analysis-Professor S. Takeda, Dr.
N. Yamomoto, Professor K. Oide, and Dr. M. Masuzawa (KEK, Japan), Dr. F.
Tecker, Dr. J.-P. Quesnel, and Dr. M. Mayoud (CERN), the Fermilab's
Alignment Group. Over the years I have had the pleasure of collaborating
on theoretical studies of the ground motion effects on high energy
particle accelerators with Dr. G. Stupakov, Dr. A. Seryi, and Dr. T.
Raubenheimer (SLAC), Dr. R. Steining (SSCL), Dr. V. Lebedev (FNAL), Dr.
J. Rossbach (DESY), and Dr. C. Montag (BNL). My special acknowledgements
to Professor Vasily Parkhomchuk of Budker INP (Novosibirsk, Russia)
who-at the time when we both were working on the design of a linear
e+e- collider VLEPP-brought my attention to deep
underlying physics issues associated with ground motion. He also was the
first who coined the term "ATL law'' while trying to analyze results of
long-term measurement of the alignment monuments motion at the site of
the UNK collider (Protvino, Russia). I am indebted to R. Carrigan for
numerous suggestions which helped to improve the manuscript. Fermilab is
operated by Fermi Research Alliance, LLC under Contract No.
DE-AC02-07CH11359 with the United States Department of Energy.
NR 55
TC 6
Z9 6
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 SEP 9
PY 2010
VL 13
IS 9
AR 094801
DI 10.1103/PhysRevSTAB.13.094801
PG 25
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 647ZP
UT WOS:000281659700002
ER
PT J
AU Virkar, AA
Mannsfeld, S
Bao, ZA
Stingelin, N
AF Virkar, Ajay A.
Mannsfeld, Stefan
Bao, Zhenan
Stingelin, Natalie
TI Organic Semiconductor Growth and Morphology Considerations for Organic
Thin-Film Transistors
SO ADVANCED MATERIALS
LA English
DT Review
ID FIELD-EFFECT TRANSISTORS; SELF-ASSEMBLED MONOLAYERS; MOLECULAR-BEAM
DEPOSITION; CHARGE-CARRIER MOBILITY; SINGLE-CRYSTALLINE; REGIOREGULAR
POLY(3-HEXYLTHIOPHENE); GATE DIELECTRICS; CONJUGATED POLYMERS; SIZE
DISTRIBUTION; EPITAXIAL-GROWTH
AB Analogous to conventional inorganic semiconductors, the performance of organic semiconductors is directly related to their molecular packing, crystallinity, growth mode, and purity. In order to achieve the best possible performance, it is critical to understand how organic semiconductors nucleate and grow. Clever use of surface and dielectric modification chemistry can allow one to control the growth and morphology, which greatly influence the electrical properties of the organic transistor. In this Review, the nucleation and growth of organic semiconductors on dielectric surfaces is addressed. The first part of the Review concentrates on small-molecule organic semiconductors. The role of deposition conditions on film formation is described. The modification of the dielectric interface using polymers or self-assembled mono layers and their effect on organic-semiconductor growth and performance is also discussed. The goal of this Review is primarily to discuss the thin-film formation of organic semiconducting species. The patterning of single crystals is discussed, while their nucleation and growth has been described elsewhere (see the Review by Liu et. al). [1] The second part of the Review focuses on polymeric semiconductors. The dependence of physicochemical properties, such as chain length (i.e., molecular weight) of the constituting macromolecule, and the influence of small molecular species on, e.g., melting temperature, as well as routes to induce order in such macromolecules, are described.
C1 [Virkar, Ajay A.; Bao, Zhenan] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA.
[Mannsfeld, Stefan] Stanford Synchrotron Radiat Lab, Menlo Pk, CA USA.
[Stingelin, Natalie] Univ London Imperial Coll Sci Technol & Med, Dept Mat, London SW7AZ, England.
RP Bao, ZA (reprint author), Stanford Univ, Dept Chem Engn, 381 N-S Mall, Stanford, CA 94305 USA.
EM zbao@stanford.edu; n.stingelin-stutzmann@imperial.ac.uk
RI Stingelin, Natalie/D-6745-2016
OI Stingelin, Natalie/0000-0002-1414-4545
FU Stanford Center for Polymeric Interfaces and Macromolecular Assemblies
(NSF-Center MRSEC); NSF DMR; Air Force Office of Scientific Research;
Stanford School of Engineering; Sloan Research Fellowship; UK
Engineering and Physical Sciences Research Council (EPSRC); Royal
Society
FX This work was partially supported by the Stanford Center for Polymeric
Interfaces and Macromolecular Assemblies (NSF-Center MRSEC), NSF DMR
Solid State Chemistry, Air Force Office of Scientific Research, the
Stanford School of Engineering, a Sloan Research Fellowship, the UK
Engineering and Physical Sciences Research Council (EPSRC) and the Royal
Society. NS is deeply indebted to Paul Smith (ETH Zurich) for being
given a unique education in classical polymer science-not only during
the preparation of this manuscript. She also wishes to thank Pascal
Wolfer and Wolfgang Kaiser (ETH Zurich) for their invaluable help in the
preparation of this manuscript, and Mohammed A. Baklar, Avinesh Kumar
(Imperial College London), Christian Muller, and Nikolai Zhigadlo (ETH
Zurich) for supplying yet unpublished results. This article is part of a
Special Issue on Organic Electronics.
NR 202
TC 210
Z9 210
U1 34
U2 333
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA POSTFACH 101161, 69451 WEINHEIM, GERMANY
SN 0935-9648
EI 1521-4095
J9 ADV MATER
JI Adv. Mater.
PD SEP 8
PY 2010
VL 22
IS 34
BP 3857
EP 3875
DI 10.1002/adma.200903193
PG 19
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 662FU
UT WOS:000282793600007
PM 20715062
ER
PT J
AU Jablin, MS
Flasinski, M
Dubey, M
Ratnaweera, DR
Broniatowski, M
Dynarowicz-Latka, P
Majewski, J
AF Jablin, Michael S.
Flasinski, Michal
Dubey, Manish
Ratnaweera, Dilru R.
Broniatowski, Marcin
Dynarowicz-Latka, Patrycja
Majewski, Jaroslaw
TI Effects of beta-Cyclodextrin on the Structure of
Sphingomyelin/Cholesterol Model Membranes
SO BIOPHYSICAL JOURNAL
LA English
DT Article
ID AIR-WATER-INTERFACE; LIPID RAFTS; CHOLESTEROL INTERACTIONS; NEUTRON
REFLECTOMETRY; CELL-MEMBRANES; X-RAY; MONOLAYERS; PHOSPHOLIPIDS;
REFLECTIVITY; EXTRACTION
AB The interaction of beta-cyclodextrin (beta-CD) with mixed bilayers composed of sphingomylein and cholesterol (Chol) above and below the accepted stable complexation ratio (67:33) was investigated. Membranes with the same (symmetric) and different (asymmetric) compositions in their inner and outer leaflets were deposited at surface pressures of 20, 30, and 40 mN/m at the solid-liquid interface. Using neutron reflectometry, membranes of various global molar ratios (defined as the sum of the molar ratios of the inner and outer leaflets), were characterized before and after beta-CD was added to the subphase. The structure of bilayers with global molar ratios at or above the stable complexation ratio was unchanged by beta-CD, indicating that beta-CD is unable to remove sphingomyelin or complexed Chol. However, beta-CD removed all uncomplexed Chol from bilayers composed of global molar ratios below the stable complexation ratio. The removal of Chol by beta-CD was independent of the initial structure of the membranes as deposited, suggesting that asymmetric membranes homogenize by the exchange of molecules between leaflets. The interaction of beta-CD with the aforementioned membranes was independent of the deposition surface pressure except for a symmetric 50:50 membrane deposited at 40 mN/m. The scattering from 50:50 bilayers with higher packing densities (deposited at 40 mN/m) was unaffected by beta-CD, suggesting that the removal of Chol can depend on both the composition and packing density of the membrane.
C1 [Jablin, Michael S.; Dubey, Manish; Majewski, Jaroslaw] Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM USA.
[Flasinski, Michal; Broniatowski, Marcin; Dynarowicz-Latka, Patrycja] Jagiellonian Univ, Fac Chem, PL-30060 Krakow, Poland.
[Ratnaweera, Dilru R.] Clemson Univ, Dept Chem, Clemson, SC 29634 USA.
RP Majewski, J (reprint author), Los Alamos Natl Lab, Manuel Lujan Jr Neutron Scattering Ctr, Los Alamos, NM USA.
EM jarek@lanl.gov
RI Dubey, Manish/C-9946-2011; Lujan Center, LANL/G-4896-2012;
Dynarowicz-Latka, Patrycja/Q-1067-2015
OI Dynarowicz-Latka, Patrycja/0000-0002-9778-6091
FU U.S. Department of Energy Office of Basic Energy Sciences; Los Alamos
National Laboratory under Department of Energy [DE-AC52-06NA25396]
FX This work benefited from the use of the Lujan Neutron Scattering Center
at Los Alamos Neutron Science Center, which was funded by the U.S.
Department of Energy Office of Basic Energy Sciences and Los Alamos
National Laboratory under Department of Energy contract
DE-AC52-06NA25396.
NR 44
TC 15
Z9 15
U1 2
U2 16
PU CELL PRESS
PI CAMBRIDGE
PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA
SN 0006-3495
J9 BIOPHYS J
JI Biophys. J.
PD SEP 8
PY 2010
VL 99
IS 5
BP 1475
EP 1481
DI 10.1016/j.bpj.2010.06.028
PG 7
WC Biophysics
SC Biophysics
GA 648VC
UT WOS:000281721500017
PM 20816059
ER
PT J
AU Virtanen, JJ
Makowski, L
Sosnick, TR
Freed, KF
AF Virtanen, Jouko J.
Makowski, Lee
Sosnick, Tobin R.
Freed, Karl F.
TI Modeling the Hydration Layer around Proteins: HyPred
SO BIOPHYSICAL JOURNAL
LA English
DT Article
ID MOLECULAR-DYNAMICS; WATER-MOLECULES; X-RAY; NEUTRON-DIFFRACTION;
POTENTIAL FUNCTIONS; CRYSTAL-STRUCTURES; SOLVENT INTERFACE; BINDING
SITES; LIQUID WATER; DNA
AB Protein hydration plays an integral role in determining protein function and stability. We develop a simple method with atomic level precision for predicting the solvent density near the surface of a protein. A set of proximal radial distribution functions are defined and calculated for a series of different atom types in proteins using all-atom, explicit solvent molecular dynamic simulations for three globular proteins. A major improvement in predicting the hydration layer is found when the protein is held immobile during the simulations. The distribution functions are used to develop a model for predicting the hydration layer with sub-1-Angstrom resolution without the need for additional simulations. The model and the distribution functions for a given protein are tested in their ability to reproduce the hydration layer from the simulations for that protein, as well as those for other proteins and for simulations in which the protein atoms are mobile. Predictions for the density of water in the hydration shells are then compared with high occupancy sites observed in crystal structures. The accuracy of both tests demonstrates that the solvation model provides a basis for quantitatively understanding protein solvation and thereby predicting the hydration layer without additional simulations.
C1 [Sosnick, Tobin R.] Univ Chicago, Dept Biochem & Mol Biol, Chicago, IL 60637 USA.
[Virtanen, Jouko J.; Freed, Karl F.] Univ Chicago, Dept Chem, Chicago, IL 60637 USA.
[Sosnick, Tobin R.] Univ Chicago, Inst Biophys Dynam, Chicago, IL 60637 USA.
[Sosnick, Tobin R.; Freed, Karl F.] Univ Chicago, Computat Inst, Chicago, IL 60637 USA.
[Virtanen, Jouko J.; Freed, Karl F.] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA.
[Makowski, Lee] Argonne Natl Lab, Argonne, IL 60439 USA.
RP Sosnick, TR (reprint author), Univ Chicago, Dept Biochem & Mol Biol, 920 E 58Th St, Chicago, IL 60637 USA.
EM trsosnic@uchicago.edu; freed@uchicago.edu
RI ID, BioCAT/D-2459-2012
FU National Institutes of Health Molecular and Cellular Biology [132
GM007183-34]; National Institutes of Health [GM081642, GM085648];
Argonne/University of Chicago Joint Theory Institute
FX Funding from the National Institutes of Health Molecular and Cellular
Biology training grant No. 132 GM007183-34, National Institutes of
Health Grant GM081642, National Institutes of Health grant GM085648, and
a grant from the Argonne/University of Chicago Joint Theory Institute
are gratefully acknowledged.
NR 39
TC 27
Z9 28
U1 0
U2 18
PU CELL PRESS
PI CAMBRIDGE
PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA
SN 0006-3495
J9 BIOPHYS J
JI Biophys. J.
PD SEP 8
PY 2010
VL 99
IS 5
BP 1611
EP 1619
DI 10.1016/j.bpj.2010.06.027
PG 9
WC Biophysics
SC Biophysics
GA 648VC
UT WOS:000281721500032
PM 20816074
ER
PT J
AU Lee, H
AF Lee, Hoonkyung
TI Preferential functionalization on zigzag graphene nanoribbons:
first-principles calculations
SO JOURNAL OF PHYSICS-CONDENSED MATTER
LA English
DT Article
ID CARBON NANOTUBES; GAS
AB We investigate the functionalization of functional groups to graphene nanoribbons with zigzag and armchair edges using first-principles calculations. We find that the formation energy for the configuration of the functional groups functionalized to the zigzag edge is similar to 0.2 eV per functional group lower than that to the armchair edge. The formation energy difference arises from a structural deformation on the armchair edge by the functionalization whereas there is no structural deformation on the zigzag edge. Selective functionalization on the zigzag edge takes place at a condition of the temperature and the pressure of similar to 25 degrees C and 10(-5) atm. Our findings show that selective functionalization can offer the opportunity for an approach to the separation of zigzag graphene nanoribbons with their solubility change.
C1 [Lee, Hoonkyung] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Lee, Hoonkyung] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA.
RP Lee, H (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM hkiee3@civet.berkeley.edu
FU NSF [DMR07-05941]; Office of Science, Office of Basic Energy Sciences,
Materials Sciences and Engineering Division, US Department of Energy
[DE-AC02-05CH11231]
FX HL was supported by NSF Grant No. DMR07-05941. Numerical simulations
were supported by the Director, Office of Science, Office of Basic
Energy Sciences, Materials Sciences and Engineering Division, US
Department of Energy under Contract No. DE-AC02-05CH11231. Computational
resources were provided by NERSC and TeraGrid.
NR 26
TC 6
Z9 6
U1 0
U2 11
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-8984
EI 1361-648X
J9 J PHYS-CONDENS MAT
JI J. Phys.-Condes. Matter
PD SEP 8
PY 2010
VL 22
IS 35
AR 352205
DI 10.1088/0953-8984/22/35/352205
PG 4
WC Physics, Condensed Matter
SC Physics
GA 645AA
UT WOS:000281422100005
PM 21403278
ER
PT J
AU Nowik, I
Felner, I
Ni, N
Bud'ko, SL
Canfield, PC
AF Nowik, Israel
Felner, Israel
Ni, Ni
Bud'ko, Sergey L.
Canfield, Paul C.
TI Mossbauer studies of Ba(Fe1-xNix)(2)As-2
SO JOURNAL OF PHYSICS-CONDENSED MATTER
LA English
DT Article
AB We present detailed Fe-57 Mossbauer effect spectroscopy (MS) measurements at various temperatures for Ba(Fe1-xNix)(2)As-2. The isomer shift values for all samples are in the range of 0.42 +/- 0.02 mm s(-1), indicating a typical metallic state of divalent Fe ions. The MS spectra of the magnetic samples (up to x = 0.024) are well reproduced by spin density waves subspectra. Both the magnetic ordering temperatures T-M and the average magnetic hyperfine fields H-eff, decrease with x. The H-eff values scale linearly with T-M. For higher x values the samples become superconducting and the MS spectra below and above T-C are almost identical, indicating that the MS technique are not sensitive enough to the superconducting transition.
C1 [Nowik, Israel; Felner, Israel] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel.
[Ni, Ni; Bud'ko, Sergey L.; Canfield, Paul C.] US DOE, Ames Lab, Ames, IA 50011 USA.
[Ni, Ni; Bud'ko, Sergey L.; Canfield, Paul C.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
RP Felner, I (reprint author), Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel.
RI Canfield, Paul/H-2698-2014
FU Israel Science Foundation (ISF) [Bikura 459/09]; Klachky Foundation for
Superconductivity; US Department of Energy-Basic Energy Sciences
[DE-AC02-07CH11358]
FX The research in Jerusalem is supported by the Israel Science Foundation
(ISF, Bikura 459/09), and by the Klachky Foundation for
Superconductivity. Work at Ames Laboratory was supported by the US
Department of Energy-Basic Energy Sciences under Contract No.
DE-AC02-07CH11358.
NR 13
TC 13
Z9 13
U1 0
U2 2
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-8984
J9 J PHYS-CONDENS MAT
JI J. Phys.-Condes. Matter
PD SEP 8
PY 2010
VL 22
IS 35
AR 355701
DI 10.1088/0953-8984/22/35/355701
PG 4
WC Physics, Condensed Matter
SC Physics
GA 645AA
UT WOS:000281422100022
PM 21403295
ER
PT J
AU Tsao, JY
Saunders, HD
Creighton, JR
Coltrin, ME
Simmons, JA
AF Tsao, J. Y.
Saunders, H. D.
Creighton, J. R.
Coltrin, M. E.
Simmons, J. A.
TI Solid-state lighting: an energy-economics perspective
SO JOURNAL OF PHYSICS D-APPLIED PHYSICS
LA English
DT Article
ID ILLUMINATION; POPULATION; CENTURIES; FUTURE; PRICE
AB Artificial light has long been a significant factor contributing to the quality and productivity of human life. As a consequence, we are willing to use huge amounts of energy to produce it. Solid-state lighting (SSL) is an emerging technology that promises performance features and efficiencies well beyond those of traditional artificial lighting, accompanied by potentially massive shifts in (a) the consumption of light, (b) the human productivity and energy use associated with that consumption and (c) the semiconductor chip area inventory and turnover required to support that consumption. In this paper, we provide estimates of the baseline magnitudes of these shifts using simple extrapolations of past behaviour into the future. For past behaviour, we use recent studies of historical and contemporary consumption patterns analysed within a simple energy-economics framework (a Cobb-Douglas production function and profit maximization). For extrapolations into the future, we use recent reviews of believed-achievable long-term performance targets for SSL. We also discuss ways in which the actual magnitudes could differ from the baseline magnitudes of these shifts. These include: changes in human societal demand for light; possible demand for features beyond lumens; and guidelines and regulations aimed at economizing on consumption of light and associated energy.
C1 [Tsao, J. Y.; Creighton, J. R.; Coltrin, M. E.; Simmons, J. A.] Sandia Natl Labs, Phys Chem & Nano Sci Ctr, Albuquerque, NM 87185 USA.
[Saunders, H. D.] Decis Proc Inc, Danville, CA 94506 USA.
RP Tsao, JY (reprint author), Sandia Natl Labs, Phys Chem & Nano Sci Ctr, POB 5800, Albuquerque, NM 87185 USA.
EM jytsao@sandia.gov; hsaunders@decisionprocessesinc.com;
jrcreig@sandia.gov; mecoltr@sandia.gov; jsimmon@sandia.gov
FU US Department of Energy, Office of Basic Energy Sciences; US Department
of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
FX The authors acknowledge helpful input and comments from Eric Shaner,
Paul Waide and a very thorough anonymous referee; and permission from
Roger Fouquet and Peter Pearson for our adaptation of figure 1 from
their monumental work on the consumption of light in the UK. Work at
Sandia National Laboratories was supported by Sandia's
Solid-State-Lighting Science Energy Frontier Research Center, funded by
the US Department of Energy, Office of Basic Energy Sciences. Sandia is
a multi-program laboratory operated by Sandia Corporation, a Lockheed
Martin Company, for the US Department of Energy's National Nuclear
Security Administration under Contract No DE-AC04-94AL85000.
NR 65
TC 41
Z9 41
U1 4
U2 21
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0022-3727
J9 J PHYS D APPL PHYS
JI J. Phys. D-Appl. Phys.
PD SEP 8
PY 2010
VL 43
IS 35
AR 354001
DI 10.1088/0022-3727/43/35/354001
PG 17
WC Physics, Applied
SC Physics
GA 641PD
UT WOS:000281139600002
ER
PT J
AU Mao, K
Kobayashi, T
Wiench, JW
Chen, HT
Tsai, CH
Lin, VSY
Pruski, M
AF Mao, Kanmi
Kobayashi, Takeshi
Wiench, Jerzy W.
Chen, Hung-Ting
Tsai, Chih-Hsiang
Lin, Victor S. -Y.
Pruski, Marek
TI Conformations of Silica-Bound (Pentafluorophenyl)propyl Groups
Determined by Solid-State NMR Spectroscopy and Theoretical Calculations
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID FUNCTIONALIZED MESOPOROUS SILICAS; THIN-FILMS; MCM-41; ACID;
SELECTIVITY; NANOSPHERE; CHEMISTRY; FLUORINE; DYNAMICS; CRYSTAL
AB The conformations of (pentafluorophenyl)propyl groups (-CH(2)-CH(2)-CH(2)-C(6)F(5), abbreviated as PFP), covalently bound to the surface of mesoporous silica nanoparticles (MSNs), were determined by solid-state NMR spectroscopy and further refined by theoretical modeling. Two types of PFP groups were described, including molecules in the prone position with the perfluorinated aromatic rings located above the siloxane bridges (PFP-p) and the PFP groups denoted as upright (PFP-u), whose aromatic rings do not interact with the silica surface. Two-dimensional (2D) (13)C-(1)H, (13)C-(19)F and (19)F-(29)Si heteronuclear correlation (HETCOR) spectra were obtained with high sensitivity on natural abundance samples using fast magic angle spinning (MAS), indirect detection of low-gamma nuclei and signal enhancement by Carr-Purcell-Meiboom-Gill (CPMG) spin-echo sequence. 2D double-quantum (DO) (19)F MAS NMR spectra and spin echo measurements provided additional information about the structure and mobility of the pentafluorophenyl rings. Optimization of the PFP geometry, as well as calculations of the interaction energies and (19)F chemical shifts, proved very useful in refining the structural features of PFP-p and PFP-u functional groups on the silica surface. The prospects of using the PFP-functionalized surface to modify its properties (e.g., the interaction with solvents, especially water) and design new types of the heterogeneous catalytic system are discussed.
C1 [Mao, Kanmi; Kobayashi, Takeshi; Wiench, Jerzy W.; Chen, Hung-Ting; Lin, Victor S. -Y.; Pruski, Marek] US DOE, Ames Lab, Ames, IA 50011 USA.
[Chen, Hung-Ting; Tsai, Chih-Hsiang; Lin, Victor S. -Y.; Pruski, Marek] Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
RP Pruski, M (reprint author), US DOE, Ames Lab, Ames, IA 50011 USA.
EM mpruski@iastate.edu
FU U.S. Department of Energy, Office of Basic Energy Sciences at the Ames
Laboratory [DE-AC02-07CH11358]; U.S. Department of Energy, Office of
Energy Efficiency and Renewable Energy [FG26-0NT08854]
FX This research was supported at the Ames Laboratory by the U.S.
Department of Energy, Office of Basic Energy Sciences, under Contract
No. DE-AC02-07CH11358. We would also like to thank the U.S. Department
of Energy, Office of Energy Efficiency and Renewable Energy (Grant No.
DE-FG26-0NT08854), for financial support.
NR 44
TC 22
Z9 22
U1 2
U2 28
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 SEP 8
PY 2010
VL 132
IS 35
BP 12452
EP 12457
DI 10.1021/ja105007b
PG 6
WC Chemistry, Multidisciplinary
SC Chemistry
GA 645LU
UT WOS:000281460100057
PM 20707348
ER
PT J
AU Kaizuka, Y
Groves, JT
AF Kaizuka, Yoshihisa
Groves, Jay T.
TI Bending-mediated superstructural organizations in phase-separated lipid
membranes
SO NEW JOURNAL OF PHYSICS
LA English
DT Article
ID SIGNAL-TRANSDUCTION; PROTEIN NETWORKS; BILAYERS; DOMAINS; MICROSCOPY;
CURVATURE; RECEPTOR; TENSION; ACTIN
AB Lipid bilayers consisting of natural lipids and cholesterols can phase-separate into two immiscible fluid phases. These phases can further get organized into elaborated patterned superstructures, hexagonal arrays and stripes, of about micron periodicity. These periodic patterns must be maintained by a macroscopic inter-domain repulsion that competes with interfacial tension and they are not predicted for systems with pair-wise molecular interactions. Herein, we present simultaneous topography and fluorescence imaging of two-phase membranes that reveal the role of membrane bending mechanics in superstructural organizations. We observe that two-phase membranes are all curved. Real-time imaging demonstrates that these curved domains repel each other by bending the intervening region to the opposite direction. This type of macroscopic mechanical interaction may contribute to spatial organization in live cell membranes that cannot be explained solely by microscopic intermolecular interactions and phase separations, such as spatial organization of signaling molecules and their coupling to topography observed in endocytotic pits or intercellular junctions.
C1 [Kaizuka, Yoshihisa; Groves, Jay T.] Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA.
[Kaizuka, Yoshihisa; Groves, Jay T.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Kaizuka, Yoshihisa; Groves, Jay T.] Lawrence Berkeley Lab, Phys Biosci & Mat Sci Div, Berkeley, CA 94720 USA.
[Kaizuka, Yoshihisa] Natl Inst Mat Sci, Ctr Biomat, Tsukuba, Ibaraki 3050047, Japan.
RP Kaizuka, Y (reprint author), Univ Calif Berkeley, Howard Hughes Med Inst, Berkeley, CA 94720 USA.
EM JTGroves@lbl.gov; KAIZUKA.Yoshihisa@nims.go.jp
FU US Department of Energy [DE-AC03-76SF00098]
FX This work was supported by the US Department of Energy under contract
no. DE-AC03-76SF00098. We thank R Parthasarathy for helpful discussions.
NR 25
TC 8
Z9 8
U1 0
U2 14
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 SEP 8
PY 2010
VL 12
AR 095001
DI 10.1088/1367-2630/12/9/095001
PG 11
WC Physics, Multidisciplinary
SC Physics
GA 651CL
UT WOS:000281902100001
ER
PT J
AU Levchenko, A
Micklitz, T
Rech, J
Matveev, KA
AF Levchenko, Alex
Micklitz, Tobias
Rech, Jerome
Matveev, K. A.
TI Transport in partially equilibrated inhomogeneous quantum wires
SO PHYSICAL REVIEW B
LA English
DT Article
ID DIMENSIONAL ELECTRON-GAS; POINT CONTACTS; SPIN POLARIZATION;
CONDUCTANCE; QUANTIZATION; RESISTANCE
AB We study transport properties of weakly interacting one-dimensional electron systems including on an equal footing thermal equilibration due to three-particle collisions and the effects of large-scale inhomogeneities. We show that equilibration in an inhomogeneous quantum wire is characterized by the competition of interaction processes which reduce the electrons total momentum and such which change the number of right- and left-moving electrons. We find that the combined effect of interactions and inhomogeneities can dramatically increase the resistance of the wire. In addition, we find that the interactions strongly affect the thermoelectric properties of inhomogeneous wires and calculate their thermal conductance, thermopower, and Peltier coefficient.
C1 [Levchenko, Alex; Matveev, K. A.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Rech, Jerome] Ctr Phys Theor, UMR 6207, F-13288 Marseille 9, France.
[Micklitz, Tobias] Free Univ Berlin, Inst Theoret Phys, D-14195 Berlin, Germany.
[Micklitz, Tobias] Free Univ Berlin, Dahlem Ctr Complex Quantum Syst, D-14195 Berlin, Germany.
RP Levchenko, A (reprint author), Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA.
FU U.S. Department of Energy, Office of Science [DE-AC02-06CH11357]
FX We are grateful to B. L. Altshuler, A. V. Andreev, A. P. Dmitriev, Y. M.
Galperin, I. V. Gornyi, D. G. Polyakov, and B. Shklovskii for helpful
discussions. This work at ANL was supported by the U.S. Department of
Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
NR 43
TC 13
Z9 13
U1 0
U2 2
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 SEP 8
PY 2010
VL 82
IS 11
AR 115413
DI 10.1103/PhysRevB.82.115413
PG 14
WC Physics, Condensed Matter
SC Physics
GA 647WK
UT WOS:000281651000006
ER
PT J
AU Paradela, C
Tassan-Got, L
Audouin, L
Berthier, B
Duran, I
Ferrant, L
Isaev, S
Le Naour, C
Stephan, C
Tarrio, D
Trubert, D
Abbondanno, U
Aerts, G
Alvarez, H
Alvarez-Velarde, F
Andriamonje, S
Andrzejewski, J
Assimakopoulos, P
Badurek, G
Baumann, P
Becvar, 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
Domingo-Pardo, C
Dridi, W
Eleftheriadis, C
Embid-Segura, M
Ferrari, A
Ferreira-Marques, R
Fujii, K
Furman, W
Goncalves, I
Gonzalez-Romero, E
Gramegna, F
Guerrero, C
Gunsing, F
Haas, B
Haight, R
Heil, M
Herrera-Martinez, A
Igashira, M
Jericha, E
Kadi, Y
Kappeler, F
Karadimos, D
Karamanis, D
Kerveno, M
Koehler, P
Kossionides, E
Krticka, M
Lampoudis, C
Leeb, H
Lindote, A
Lopes, I
Lozano, M
Lukic, S
Marganiec, J
Marrone, S
Martinez, T
Massimi, C
Mastinu, P
Mengoni, A
Milazzo, PM
Moreau, C
Mosconi, M
Neves, F
Oberhummer, H
O'Brien, S
Oshima, M
Pancin, J
Papachristodoulou, C
Papadopoulos, C
Patronis, N
Pavlik, A
Pavlopoulos, P
Perrot, L
Pigni, MT
Plag, R
Plompen, A
Plukis, A
Poch, A
Praena, J
Pretel, C
Quesada, J
Rauscher, T
Reifarth, R
Rubbia, C
Rudolf, G
Rullhusen, P
Salgado, J
Santos, C
Sarchiapone, L
Savvidis, I
Tagliente, G
Tain, JL
Tavora, L
Terlizzi, R
Vannini, G
Vaz, P
Ventura, A
Villamarin, D
Vincente, MC
Vlachoudis, V
Vlastou, R
Voss, F
Walter, S
Wiescher, M
Wisshak, K
AF Paradela, C.
Tassan-Got, L.
Audouin, L.
Berthier, B.
Duran, I.
Ferrant, L.
Isaev, S.
Le Naour, C.
Stephan, C.
Tarrio, D.
Trubert, D.
Abbondanno, U.
Aerts, G.
Alvarez, H.
Alvarez-Velarde, F.
Andriamonje, S.
Andrzejewski, J.
Assimakopoulos, P.
Badurek, G.
Baumann, P.
Becvar, 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.
Domingo-Pardo, C.
Dridi, W.
Eleftheriadis, C.
Embid-Segura, M.
Ferrari, A.
Ferreira-Marques, R.
Fujii, K.
Furman, W.
Goncalves, I.
Gonzalez-Romero, E.
Gramegna, F.
Guerrero, C.
Gunsing, F.
Haas, B.
Haight, R.
Heil, M.
Herrera-Martinez, A.
Igashira, M.
Jericha, E.
Kadi, Y.
Kappeler, F.
Karadimos, D.
Karamanis, D.
Kerveno, M.
Koehler, P.
Kossionides, E.
Krticka, M.
Lampoudis, C.
Leeb, H.
Lindote, A.
Lopes, I.
Lozano, M.
Lukic, S.
Marganiec, J.
Marrone, S.
Martinez, T.
Massimi, C.
Mastinu, P.
Mengoni, A.
Milazzo, P. M.
Moreau, C.
Mosconi, M.
Neves, F.
Oberhummer, H.
O'Brien, S.
Oshima, M.
Pancin, J.
Papachristodoulou, C.
Papadopoulos, C.
Patronis, N.
Pavlik, A.
Pavlopoulos, P.
Perrot, L.
Pigni, M. T.
Plag, R.
Plompen, A.
Plukis, A.
Poch, A.
Praena, J.
Pretel, C.
Quesada, J.
Rauscher, T.
Reifarth, R.
Rubbia, C.
Rudolf, G.
Rullhusen, P.
Salgado, J.
Santos, C.
Sarchiapone, L.
Savvidis, I.
Tagliente, G.
Tain, J. L.
Tavora, L.
Terlizzi, R.
Vannini, G.
Vaz, P.
Ventura, A.
Villamarin, D.
Vincente, M. C.
Vlachoudis, V.
Vlastou, R.
Voss, F.
Walter, S.
Wiescher, M.
Wisshak, K.
CA n TOF Collaboration
TI Neutron-induced fission cross section of U-234 and Np-237 measured at
the CERN Neutron Time-of-Flight (n_TOF) facility
SO PHYSICAL REVIEW C
LA English
DT Article
ID NUCLEAR-DATA LIBRARY; ENERGY-RANGE; ANGULAR-DISTRIBUTION; DEPENDENCE;
ANISOTROPY; FRAGMENTS; PU-239
AB A high-resolution measurement of the neutron-induced fission cross section of U-234 and Np-237 has been performed at the CERN Neutron Time-of-Flight facility. The cross sections have been determined in a wide energy range from 1 eV to 1 GeV using the evaluated U-235 cross section as reference. In these measurements the energy determination for the U-234 resonances could be improved, whereas previous discrepancies for the Np-237 resonances were confirmed. New cross-section data are provided for high neutron energies that go beyond the limits of prior evaluations, obtaining important differences in the case of Np-237.
C1 [Paradela, C.; Duran, I.; Tarrio, D.; Alvarez, H.] Univ Santiago de Compostela, Santiago De Compostela, Spain.
[Tassan-Got, L.; Audouin, L.; Berthier, B.; Ferrant, L.; Isaev, S.; Le Naour, C.; Stephan, C.; Trubert, D.; David, S.] CNRS, IPN, IN2P3, F-91405 Orsay, France.
[Audouin, L.; Dillmann, I.; Heil, M.; Kappeler, F.; Mosconi, M.; Plag, R.; Voss, F.; Walter, S.; Wisshak, K.] Forschungszentrum Karlsruhe GmbH FZK, Inst Kernphys, Karlsruhe, Germany.
[Abbondanno, U.; Fujii, K.; Milazzo, P. M.; Moreau, C.] Ist Nazl Fis Nucl, Trieste, Italy.
[Aerts, G.] CEA Saclay, IRFU, F-91191 Gif Sur Yvette, France.
[Alvarez-Velarde, F.; Cano-Ott, D.; Embid-Segura, M.; Gonzalez-Romero, E.; Guerrero, C.; Martinez, T.; Villamarin, D.; Vincente, M. C.] Ctr Invest Energet Medioambientales & Tecnol, Madrid, Spain.
[Andriamonje, S.; Berthoumieux, E.; Carrapico, C.; Dridi, W.; Gunsing, F.; Lampoudis, C.; Pancin, J.; Perrot, L.; Plukis, A.] CEA Saclay, DSM DAPNIA, F-91191 Gif Sur Yvette, France.
[Andrzejewski, J.; Marganiec, J.] Univ Lodz, PL-90131 Lodz, Poland.
[Assimakopoulos, P.; Karadimos, D.; Karamanis, D.; Papachristodoulou, C.; Patronis, N.] 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, Prague, Czech Republic.
[Calvino, F.] Univ Politecn Cataluna, Barcelona, Spain.
[Calviani, M.; Gramegna, F.; Mastinu, P.; Praena, J.] Ist Nazl Fis Nucl, Lab Nazl Legnaro, Legnaro, Italy.
[Calviani, M.] Univ Padua, Dipartimento Fis, I-35100 Padua, Italy.
[Capote, R.; Lozano, M.; Quesada, J.] Univ Seville, Seville, Spain.
[Capote, R.; Mengoni, A.] IAEA, Nucl Data Sect, A-1400 Vienna, Austria.
[Carrapico, C.; Salgado, J.; Santos, C.; Tavora, L.; Vaz, P.] Inst Tecnol & Nucl, Lisbon, Portugal.
[Cennini, P.; Chiaveri, E.; Dahlfors, M.; Ferrari, A.; Herrera-Martinez, A.; Kadi, Y.; Mengoni, A.; Sarchiapone, L.; Vlachoudis, V.] CERN, Geneva, Switzerland.
[Chepel, V.; Ferreira-Marques, R.; Goncalves, I.; Lindote, A.; Lopes, I.; Neves, F.] Univ Coimbra, LIP Coimbra, P-3000 Coimbra, Portugal.
[Chepel, V.; Ferreira-Marques, R.; Goncalves, I.; 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.
[Domingo-Pardo, C.; Tain, J. L.] Univ Valencia, CSIC, Inst Fis Corpuscular, E-46003 Valencia, Spain.
[Domingo-Pardo, C.] GSI, Darmstadt, Germany.
[Eleftheriadis, C.; Lampoudis, C.; Savvidis, I.] Aristotle Univ Thessaloniki, Thessaloniki, Greece.
[Furman, W.] Joint Inst Nucl Res, Frank Lab Neutron Phys, Dubna, Russia.
[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.
[Massimi, C.; Vannini, G.] Univ Bologna, Dipartimento Fis, Bologna, Italy.
[Massimi, C.; Vannini, G.] Sezione Ist Nazl Fis Nucl, Bologna, Italy.
[Oshima, M.] Japan Atom Energy Res Inst, Tokai, Ibaraki 31911, Japan.
[Papadopoulos, C.; Vlastou, R.] Natl Tech Univ Athens, GR-10682 Athens, Greece.
[Pavlik, A.] Univ Vienna, Fak Phys, A-1010 Vienna, Austria.
[Pavlopoulos, P.] Pole Univ Leonard Vinci, Paris, France.
[Plompen, A.; Rullhusen, P.] CEC JRC IRMM, Geel, Belgium.
[Rauscher, T.] Univ Basel, Dept Phys, CH-4003 Basel, Switzerland.
[Rubbia, C.] Univ Pavia, I-27100 Pavia, Italy.
[Ventura, A.] ENEA, Bologna, Italy.
RP Paradela, C (reprint author), Univ Santiago de Compostela, Santiago De Compostela, Spain.
EM carlos.paradela@usc.es
RI 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; 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; Massimi,
Cristian/K-2008-2015; 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; Neves, Francisco/H-4744-2013; Goncalves,
Isabel/J-6954-2013; Vaz, Pedro/K-2464-2013; Lopes, Isabel/A-1806-2014;
Cortes, Guillem/B-6869-2014; Tain, Jose L./K-2492-2014
OI Calvino, Francisco/0000-0002-7198-4639; Mengoni,
Alberto/0000-0002-2537-0038; Paradela Dobarro,
Carlos/0000-0003-0175-8334; Cano Ott, Daniel/0000-0002-9568-7508;
Quesada Molina, Jose Manuel/0000-0002-2038-2814; 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; Massimi, Cristian/0000-0003-2499-5586;
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 EC [FIKW-CT-2000-00107]
FX This work was supported by the EC under Contract No. FIKW-CT-2000-00107.
NR 62
TC 50
Z9 50
U1 4
U2 28
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 SEP 8
PY 2010
VL 82
IS 3
AR 034601
DI 10.1103/PhysRevC.82.034601
PG 11
WC Physics, Nuclear
SC Physics
GA 647WN
UT WOS:000281651400002
ER
PT J
AU Borovsky, JE
AF Borovsky, Joseph E.
TI Contribution of Strong Discontinuities to the Power Spectrum of the
Solar Wind
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID INTERPLANETARY MAGNETIC-FIELD; NONLINEAR ALFVEN WAVES; TUBE TECTONICS
MODEL; TANGENTIAL DISCONTINUITIES; MAGNETOHYDRODYNAMIC TURBULENCE;
HYDROMAGNETIC TURBULENCE; SPACECRAFT OBSERVATIONS; CURRENT-SHEET; 1/F
NOISE; FLUCTUATIONS
AB Eight and a half years of magnetic field measurements (2(22) samples) from the ACE spacecraft in the solar wind at 1 A.U. are analyzed. Strong (large-rotation-angle) discontinuities in the solar wind are collected and measured. An artificial time series is created that preserves the timing and amplitudes of the discontinuities. The power spectral density of the discontinuity series is calculated and compared with the power spectral density of the solar-wind magnetic field. The strong discontinuities produce a power-law spectrum in the "inertial subrange" with a spectral index near the Kolmogorov -5/3 index. The discontinuity spectrum contains about half of the power of the full solar-wind magnetic field over this "inertial subrange." Warnings are issued about the significant contribution of discontinuities to the spectrum of the solar wind, complicating interpretation of spectral power and spectral indices.
C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Borovsky, JE (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
FU NASA Heliospheric SRT Program; NASA Heliospheric Guest-Investigator
Program; NSF SHINE Program; LDRD Program at Los Alamos National
Laboratory
FX The author thanks Mick Denton for his help. This research was supported
by the NASA Heliospheric SR&T Program, the NASA Heliospheric
Guest-Investigator Program, by the NSF SHINE Program, and by the LDRD
Program at Los Alamos National Laboratory.
NR 64
TC 32
Z9 33
U1 0
U2 8
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
EI 1079-7114
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD SEP 8
PY 2010
VL 105
IS 11
AR 111102
DI 10.1103/PhysRevLett.105.111102
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 647WZ
UT WOS:000281652700002
PM 20867562
ER
PT J
AU Khoo, KH
Zayak, AT
Kwak, H
Chelikowsky, JR
AF Khoo, K. H.
Zayak, A. T.
Kwak, H.
Chelikowsky, James R.
TI First-Principles Study of Confinement Effects on the Raman Spectra of Si
Nanocrystals
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID SILICON NANOCRYSTALS; SCATTERING; MICROCRYSTALLINE; SPECTROSCOPY; MODE
AB The Raman spectra of Si nanocrystals are studied as a function of nanocrystal diameter using pseudopotential density functional theory and the Placzek approximation. Our calculations reproduce the redshift and broadening of the optical Raman peak with decreasing nanocrystal size, and calculated peak frequencies show good agreement with experimental values. We also find that a surface induced softening of vibrational modes is largely responsible for the Raman redshift, with relaxation of momentum conservation playing only a minor role.
C1 [Khoo, K. H.; Chelikowsky, James R.] Univ Texas Austin, Inst Computat Engn & Sci, Ctr Computat Mat, Austin, TX 78712 USA.
[Zayak, A. T.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Mol Foundry, Berkeley, CA 94720 USA.
[Kwak, H.] Washington State Univ, Inst Shock Phys, Spokane, WA 99202 USA.
[Chelikowsky, James R.] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA.
[Chelikowsky, James R.] Univ Texas Austin, Dept Chem Engn, Austin, TX 78712 USA.
RP Khoo, KH (reprint author), Univ Texas Austin, Inst Computat Engn & Sci, Ctr Computat Mat, Austin, TX 78712 USA.
RI Khoo, Khoong Hong/G-3983-2012
OI Khoo, Khoong Hong/0000-0002-4628-1202
FU U.S. Department of Energy [DE-FG02-06ER46286]; National Science
Foundation [DMR 09-41645]; Office of Science, Office of Basic Energy
Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
FX This work is supported in part by the U.S. Department of Energy under
Contract No. DE-FG02-06ER46286. Computational work was supported by the
National Science Foundation under Grant No. DMR 09-41645. 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. Calculations were performed at the National
Energy Research Scientific Computing Center (NERSC) and Texas Advanced
Computing Center (TACC).
NR 23
TC 30
Z9 30
U1 1
U2 30
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 SEP 8
PY 2010
VL 105
IS 11
AR 115504
DI 10.1103/PhysRevLett.105.115504
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 647WZ
UT WOS:000281652700010
PM 20867585
ER
PT J
AU Beyerlein, IJ
Tome, CN
AF Beyerlein, I. J.
Tome, C. N.
TI A probabilistic twin nucleation model for HCP polycrystalline metals
SO PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING
SCIENCES
LA English
DT Article
DE twinning; nucleation; probability; statistics; HCP; size effect
ID DEFORMATION TWINS; GRAIN-SIZE; PLASTIC-DEFORMATION; HARDENING EVOLUTION;
HEXAGONAL MATERIALS; CONSTITUTIVE LAW; ZINC CRYSTALS; ZIRCONIUM; SLIP;
TEMPERATURE
AB This article presents a basic probabilistic theory for the nucleation of deformation twins in hexagonal close packed (HCP) metals. Twin nucleation is assumed to rely on the dissociation of grain boundary defects (GBDs) under stress into the required number of twinning partials to create a twin nucleus. The number of successful conversion events is considered to follow a stochastic Poisson process where the rate is assumed to increase with local stress. From this concept, the probability distribution for the critical stress to form a twin nucleus is derived wherein the parameters of the distribution are related to properties of the GBDs. The theory is implemented into a multi-scale constitutive model for HCP metals in order to test its predictive capability against measurements made previously on pure zirconium deformed at 76 and 300 K.
C1 [Beyerlein, I. J.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Tome, C. N.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
RP Beyerlein, IJ (reprint author), Los Alamos Natl Lab, Div Theoret, Mail Stop B216, Los Alamos, NM 87545 USA.
EM irene@lanl.gov
RI Tome, Carlos/D-5058-2013; Beyerlein, Irene/A-4676-2011
FU Office of Basic Energy Sciences under U.S. DOE [FWP 06SCPE401,
7405-ENG-36]
FX The present work was performed with support from Office of Basic Energy
Sciences, Project FWP 06SCPE401, under U.S. DOE Contract no.
W-7405-ENG-36.
NR 46
TC 87
Z9 88
U1 5
U2 38
PU ROYAL SOC
PI LONDON
PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND
SN 1364-5021
J9 P ROY SOC A-MATH PHY
JI Proc. R. Soc. A-Math. Phys. Eng. Sci.
PD SEP 8
PY 2010
VL 466
IS 2121
BP 2517
EP 2544
DI 10.1098/rspa.2009.0661
PG 28
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 633SC
UT WOS:000280524300002
ER
PT J
AU Marsh, JA
Dancheck, B
Ragusa, MJ
Allaire, M
Forman-Kay, JD
Peti, W
AF Marsh, Joseph A.
Dancheck, Barbara
Ragusa, Michael J.
Allaire, Marc
Forman-Kay, Julie D.
Peti, Wolfgang
TI Structural Diversity in Free and Bound States of Intrinsically
Disordered Protein Phosphatase 1 Regulators
SO STRUCTURE
LA English
DT Article
ID MOLECULAR RECOGNITION FEATURES; NATIVELY UNFOLDED PROTEINS; RAY SOLUTION
SCATTERING; UNSTRUCTURED PROTEINS; BINDING; INHIBITOR-2; SPINOPHILIN;
KINASE; DOMAIN; PHOSPHORYLATION
AB Complete folding is not a prerequisite for protein function, as disordered and partially folded states of proteins frequently perform essential biological functions. In order to understand their functions at the molecular level, we utilized diverse experimental measurements to calculate ensemble models of three nonhomologous, intrinsically disordered proteins: 1-2, spinophilin, and DARPP-32, which bind to and regulate protein phosphatase 1 (PP1). The models demonstrate that these proteins have dissimilar propensities for secondary and tertiary structure in their unbound forms. Direct comparison of these ensemble models with recently determined PP1 complex structures suggests a significant role for transient, preformed structure in the interactions of these proteins with PP1. Finally, we generated an ensemble model of partially disordered 1-2 bound to PP1 that provides insight into the relationship between flexibility and biological function in this dynamic complex.
C1 [Marsh, Joseph A.; Forman-Kay, Julie D.] Hosp Sick Children, Toronto, ON M5G 1X8, Canada.
[Marsh, Joseph A.; Forman-Kay, Julie D.] Univ Toronto, Dept Biochem, Toronto, ON M5S 1A8, Canada.
[Dancheck, Barbara; Ragusa, Michael J.; Peti, Wolfgang] Brown Univ, Dept Chem, Providence, RI 02912 USA.
[Dancheck, Barbara; Ragusa, Michael J.; Peti, Wolfgang] Brown Univ, Dept Mol Pharmacol Physiol & Biotechnol, Providence, RI 02912 USA.
[Allaire, Marc] Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Forman-Kay, JD (reprint author), Hosp Sick Children, 555 Univ Ave, Toronto, ON M5G 1X8, Canada.
EM forman@sickkids.ca; Wolfgang_Peti@brown.edu
RI Marsh, Joseph/F-2142-2010; Peti, Wolfgang/L-3492-2014;
OI Marsh, Joseph/0000-0003-4132-0628
FU Natural Sciences and Engineering Research Council of Canada; National
Science Foundation; National Institute of Neurological Disorders and
Stroke [R01NS056128]; Canadian Institutes of Health Research; U.S.
Department of Energy, Office of Science, Office of Basic Energy Sciences
[DE-AC02-98CH10886]
FX This material is based upon work supported by a Natural Sciences and
Engineering Research Council of Canada fellowship to J.A.M. and a
National Science Foundation Graduate Research Fellowship to B.D. We
thank Dr. Lin Yang for his support at beamline X9. The project described
was supported by Grant R01NS056128 from the National Institute of
Neurological Disorders and Stroke to W.P. and funding from the Canadian
Institutes of Health Research to J.D.F.-K. 800 MHz NMR data were
recorded at Brandeis University (NIH S10-RR017269). 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 60
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U1 1
U2 23
PU CELL PRESS
PI CAMBRIDGE
PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA
SN 0969-2126
J9 STRUCTURE
JI Structure
PD SEP 8
PY 2010
VL 18
IS 9
BP 1094
EP 1103
DI 10.1016/j.str.2010.05.015
PG 10
WC Biochemistry & Molecular Biology; Biophysics; Cell Biology
SC Biochemistry & Molecular Biology; Biophysics; Cell Biology
GA 650GE
UT WOS:000281836400006
PM 20826336
ER
PT J
AU Moulaei, T
Shenoy, SR
Giomarelli, B
Thomas, C
McMahon, JB
Dauter, Z
O'Keefe, BR
Wlodawer, A
AF Moulaei, Tinoush
Shenoy, Shilpa R.
Giomarelli, Barbara
Thomas, Cheryl
McMahon, James B.
Dauter, Zbigniew
O'Keefe, Barry R.
Wlodawer, Alexander
TI Monomerization of Viral Entry Inhibitor Griffithsin Elucidates the
Relationship between Multivalent Binding to Carbohydrates and anti-HIV
Activity
SO STRUCTURE
LA English
DT Article
ID ANTIVIRAL PROTEIN GRIFFITHSIN; INACTIVATING PROTEIN; CRYSTAL-STRUCTURE;
CYANOVIRIN-N; STRUCTURAL BASIS; BANANA LECTIN; SPECIFICITY; MANNOSE;
GLYCOPROTEINS; DOMAIN
AB Mutations were introduced to the domain-swapped homodimer of the antiviral lectin griffithsin (GRFT). Whereas several single and double mutants remained dimeric, insertion of either two or four amino acids at the dimerization interface resulted in a monomeric form of the protein (mGRFT). Monomeric character of the modified proteins was confirmed by sedimentation equilibrium ultracentrifugation and by their high resolution X-ray crystal structures, whereas their binding to carbohydrates was assessed by isothermal titration calorimetry. Cell-based antiviral activity assays utilizing different variants of mGRFT indicated that the monomeric form of the lectin had greatly reduced activity against HIV-1, suggesting that the antiviral activity of GRFT stems from crosslinking and aggregation of viral particles via multivalent interactions between GRFT and oligosaccharides present on HIV envelope glycoproteins. Atomic resolution crystal structure of a complex between mGRFT and nonamannoside revealed that a single mGRFT molecule binds to two different nonamannoside molecules through all three carbohydrate-binding sites present on the monomer.
C1 [Shenoy, Shilpa R.; Giomarelli, Barbara; Thomas, Cheryl; McMahon, James B.; O'Keefe, Barry R.] NCI, Mol Targets Lab, Ctr Canc Res, Frederick, MD 21702 USA.
[Moulaei, Tinoush; Wlodawer, Alexander] NCI, Prot Struct Sect, Macromol Crystallog Lab, Frederick, MD 21702 USA.
[Shenoy, Shilpa R.] NCI, SAIC Frederick Inc, Frederick, MD 21702 USA.
[Dauter, Zbigniew] Argonne Natl Lab, Synchrotron Radiat Res Sect, Macromol Crystallog Lab, Natl Canc Inst, Argonne, IL 60439 USA.
RP O'Keefe, BR (reprint author), NCI, Mol Targets Lab, Ctr Canc Res, Frederick, MD 21702 USA.
EM okeefeba@mail.nih.gov; wlodawer@nih.gov
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [W-31-109-Eng-38]; NIH, National Cancer Institute, Center for
Cancer Research; National Cancer Institute, National Institutes of
Health [HNSN26120080001E]; National Institutes of Health
FX We thank Chi-Huey Wong and Sheng-Kai Wang (Scripps) for the gift of the
nonamannoside, Nikolay V. Dokholyan (University of North Carolina) for
suggesting several mutations of GRFT, Nicole LaRonde-LeBlanc (University
of Maryland) for her assistance with ultracentrifugation experiments and
helpful discussions, and David Eisenberg (UCLA) for discussion of the
phenomenon of domain swapping. We would also like to thank Jennifer
Wilson (MTL, CCR, NCI) for anti-HIV bioassay support, and Marzena Dyba
(SBL, SAIC-Frederick, CCR, NCI) and Sergei Tarasov (SBL, CCR, NCI) for
their assistance with dynamic light scattering experiments. We
acknowledge the use of beamline 22-ID of the Southeast Regional
Collaborative Access Team (SER-CAT), located at the Advanced Photon
Source, Argonne National Laboratory. Use of the APS was supported by the
U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences, under Contract No. W-31-109-Eng-38. This research was
supported in part by the Intramural Research Program of the NIH,
National Cancer Institute, Center for Cancer Research, and by the
Intramural AIDS Targeted Antiviral Program of the Office of the Director
of the National Institutes of Health grant to A.W. This project has been
funded in whole or in part with federal funds from the National Cancer
Institute, National Institutes of Health, under contract
HNSN26120080001E. 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 36
TC 42
Z9 42
U1 3
U2 11
PU CELL PRESS
PI CAMBRIDGE
PA 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA
SN 0969-2126
J9 STRUCTURE
JI Structure
PD SEP 8
PY 2010
VL 18
IS 9
BP 1104
EP 1115
DI 10.1016/j.str.2010.05.016
PG 12
WC Biochemistry & Molecular Biology; Biophysics; Cell Biology
SC Biochemistry & Molecular Biology; Biophysics; Cell Biology
GA 650GE
UT WOS:000281836400007
PM 20826337
ER
PT J
AU Greskowiak, J
Prommer, H
Liu, C
Post, VEA
Ma, R
Zheng, C
Zachara, JM
AF Greskowiak, J.
Prommer, H.
Liu, C.
Post, V. E. A.
Ma, R.
Zheng, C.
Zachara, J. M.
TI Comparison of parameter sensitivities between a laboratory and
field-scale model of uranium transport in a dual domain, distributed
rate reactive system
SO WATER RESOURCES RESEARCH
LA English
DT Article
ID NATURAL ATTENUATION; SUBSURFACE MEDIA; VIRUS TRANSPORT; MASS-TRANSFER;
GROUNDWATER; ADSORPTION; PLUME; UNCERTAINTY; DESORPTION; SEDIMENTS
AB A laboratory-derived conceptual and numerical model for U(VI) transport at the Hanford 300A site, Washington, USA, was applied to a range of field-scale scenarios of different geochemical complexity to identify the importance of individual processes in controlling the fate of U(VI), as well as to elucidate the characteristic differences between well-defined laboratory and the more complex field-scale conditions. Therefore, a rigorous sensitivity analysis was carried out for the various simulation scenarios. The underlying conceptual and numerical model, originally developed from column experiment data, includes distributed rate surface complexation kinetics of U(VI), aqueous speciation, and physical nonequilibrium transport processes. The field scenarios accounted additionally for highly transient groundwater flow and variable geochemical conditions driven by frequent water level changes of the nearby Columbia River. The results of the sensitivity analysis showed not only similarities but also important differences in parameter sensitivities between the laboratory and field-scale models. It was found that the actual degree of sorption disequilibrium, actual concentration of sorbed U(VI), and the sorption extent (i.e., theoretical concentration of sorbed U(VI) at equilibrium) are the major controls for the magnitude of the calculated parameter sensitivities. These internal model variables depended mainly on (1) the groundwater flow conditions, i.e., the relatively long phases of limited groundwater movement in the field scale (intercepted by short peak flow events) and the long sustained flow phases in the column experiment (intercepted by relatively short stop flow events), and (2) the sampling location in the field-scale model, i.e., plume fringe versus plume center.
C1 [Greskowiak, J.; Prommer, H.] CSIRO Land & Water, Wembley, WA 6913, Australia.
[Prommer, H.] Univ Western Australia, Sch Earth & Environm, Crawley, WA, Australia.
[Liu, C.; Zachara, J. M.] Pacific NW Natl Lab, Richland, WA 99354 USA.
[Post, V. E. A.] Flinders Univ S Australia, Sch Environm, Fac Sci & Engn, Adelaide, SA 5001, Australia.
[Post, V. E. A.] Flinders Univ S Australia, Natl Ctr Groundwater Res & Training, Adelaide, SA 5001, Australia.
[Ma, R.; Zheng, C.] Univ Alabama, Dept Geol Sci, Tuscaloosa, AL 35487 USA.
[Post, V. E. A.] Vrije Univ Amsterdam, Dept Hydrol & Geoenvironm Sci, Fac Earth & Life Sci, Amsterdam, Netherlands.
RP Greskowiak, J (reprint author), CSIRO Land & Water, Private Bag 5, Wembley, WA 6913, Australia.
EM janek.greskowiak@csiro.au; vincent.post@flinders.edu.au
RI Liu, Chongxuan/C-5580-2009; Prommer, Henning/A-4555-2008; Post,
Vincent/E-6054-2011; Zheng, Chunmiao/I-5257-2014; Greskowiak,
Janek/F-4198-2012
OI Prommer, Henning/0000-0002-8669-8184; Post, Vincent/0000-0002-9463-3081;
Zheng, Chunmiao/0000-0001-5839-1305;
FU CSIRO OCE; U.S. Department of Energy; iVEC at Murdoch University,
Western Australia
FX We very much thank Aaron McDonough for preparing the parallel version of
PHT3D, Mike Trefry for constant and insightful discussions, and Jungho
Park for valuable comments on earlier versions of the manuscript. We are
grateful for the helpful suggestions by Mary Hill, Matthew Tonkin, and
two anonymous reviewers. The work was supported by iVEC through the use
of advanced high performance computing resources provided by the
Australian Resources Research Centre and the Informatics Facility of the
Centre for Comparative Genomics located at Murdoch University, Western
Australia. This research was also supported by a CSIRO OCE postdoctoral
fellowship for J.G., and by the U.S. Department of Energy Environmental
Remediation Science Program.
NR 39
TC 17
Z9 17
U1 2
U2 32
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0043-1397
J9 WATER RESOUR RES
JI Water Resour. Res.
PD SEP 8
PY 2010
VL 46
AR W09509
DI 10.1029/2009WR008781
PG 13
WC Environmental Sciences; Limnology; Water Resources
SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water
Resources
GA 649HH
UT WOS:000281758400002
ER
PT J
AU Bender, G
Stich, TA
Yan, LF
Britt, RD
Cramer, SP
Ragsdale, SW
AF Bender, Guenes
Stich, Troy A.
Yan, Lifen
Britt, R. David
Cramer, Stephen P.
Ragsdale, Stephen W.
TI Infrared and EPR Spectroscopic Characterization of a Ni(I) Species
Formed by Photolysis of a Catalytically Competent Ni(I)-CO Intermediate
in the Acetyl-CoA Synthase Reaction
SO BIOCHEMISTRY
LA English
DT Article
ID CARBON-MONOXIDE DEHYDROGENASE; COENZYME-A SYNTHASE; CONTAINING
SUPEROXIDE-DISMUTASE; VULGARIS MIYAZAKI-F; IRON-SULFUR PROTEIN;
CLOSTRIDIUM-THERMOACETICUM; CRYSTAL-STRUCTURE; REDUCTIVE ACTIVATION;
ACETATE BIOSYNTHESIS; LIGAND-BINDING
AB Acetyl-CoA synthase (ACS) catalyzes the synthesis of acetyl-CoA from CO, coenzyme A (CoA), and a methyl group from the CH(3)-Co(3+) site in the corrinoid iron sulfur protein (CFeSP). These are the key steps in the Wood-Ljungdahl pathway of anaerobic CO and CO(2) fixation. The active site of ACS is the A-cluster, which is an unusual nickel-iron-sulfur cluster. There is significant evidence for the catalytic intermediacy of a CO-bound paramagnetic Ni species, with an electronic configuration of [Fe(4)S(4)](2+)-(Ni(p)(+)-CO)-(Ni(d)(2+)), where Ni(p) and Ni(d) represent the Ni centers in the A-cluster that are proximal and distal to the [Fe(4)S(4)](2+) cluster, respectively. This well-characterized Ni(p)(+)-CO intermediate is often called the NiFeC species. Photolysis of the Ni(p)(+)-CO state generates a novel Ni(p)(+) species (A(red)*) with a rhombic electron paramagnetic resonance spectrum (g values of 2.56, 2.10, and 2.01) and an extremely low (1 kJ/mol) barrier for recombination with CO. We suggest that the photolytically generated A(red)* species is (or is similar to) the Ni(p)(+) species that binds CO (to form the Ni(p)(+)-CO species) and the methyl group (to form Ni(p)-CH(3)) in the ACS catalytic mechanism. The results provide support for a binding site (an "alcove") for CO near Ni(p), indicated by X-ray crystallographic studies of the Xe-incubated enzyme. We propose that, during catalysis, a resting Ni(p)(2+) state predominates over the active Ni(p)(+) species (A(red)*) that is trapped by the coupling of a one-electron transfer step to the binding of CO, which pulls the equilibrium toward Ni(p)(+)-CO formation.
C1 [Ragsdale, Stephen W.] Univ Michigan, Dept Biol Chem, Sch Med, Ann Arbor, MI 48109 USA.
[Stich, Troy A.; Britt, R. David] Univ Calif Davis, Dept Chem, Davis, CA 95616 USA.
[Yan, Lifen; Cramer, Stephen P.] Univ Calif Davis, Dept Appl Sci, Davis, CA 95616 USA.
[Cramer, Stephen P.] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
RP Ragsdale, SW (reprint author), Univ Michigan, Dept Biol Chem, Sch Med, 1150 W Med Ctr Dr, Ann Arbor, MI 48109 USA.
EM sragsdal@umich.edu
RI Stich, Troy/F-1625-2013
OI Stich, Troy/0000-0003-0710-1456
FU National Institutes of Health (NIH) [GM-39451, GM-65440, GM-48242];
National Science Foundation [CHE-0745353]; DOE OBER
FX This research was supported by grants to S.W.R. [National Institutes of
Health (NIH) Grant GM-39451], S.P.C. (NIH Grant GM-65440, National
Science Foundation Grant CHE-0745353, and DOE OBER), and R.D.B. (NIH
Grant GM-48242).
NR 63
TC 18
Z9 20
U1 1
U2 22
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0006-2960
J9 BIOCHEMISTRY-US
JI Biochemistry
PD SEP 7
PY 2010
VL 49
IS 35
BP 7516
EP 7523
DI 10.1021/bi1010128
PG 8
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 643OD
UT WOS:000281305200013
PM 20669901
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Abbott, BP
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Adams, C
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Bertolini, A
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Beveridge, N
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Bilenko, IA
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Birch, J
Birindellia, S
Biswas, R
Bitossi, M
Bizouard, MA
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Bland, B
Bloma, M
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Bork, R
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Waldman, S. J.
Wallace, L.
Wanner, A.
Ward, R. L.
Wasa, M.
Wei, P.
Weinert, M.
Weinstein, A. J.
Weiss, R.
Wen, L.
Wen, S.
Wessels, P.
West, M.
Westphal, T.
Wette, K.
Whelan, J. T.
EWhitcomb, S.
White, D. J.
Whiting, B. F.
Wilkinson, C.
Willems, P. A.
Williams, L.
Willke, B.
Winkelmann, L.
Winkler, W.
Wipf, C. C.
Wiseman, A. G.
Woan, G.
Wooley, R.
Worden, J.
Yakushin, I.
Yamamoto, H.
Yamamoto, K.
Yeaton-Massey, D.
Yoshida, S.
Yu, P. P.
Yvert, M.
Zanolin, M.
Zhang, L.
Zhang, Z.
Zhao, C.
Zotov, N.
Zucker, M. E.
Zweizig, J.
Belczynski, K.
CA LIGO Sci Collaboration & Virgo
TI Predictions for the rates of compact binary coalescences observable by
ground-based gravitational-wave detectors
SO CLASSICAL AND QUANTUM GRAVITY
LA English
DT Review
ID GAMMA-RAY BURSTS; MASS BLACK-HOLES; NEUTRON-STAR BINARIES; CONSTRAINING
POPULATION; GLOBULAR-CLUSTERS; SYNTHESIS MODELS; SUPERNOVA RATES;
MERGERS; COMPANIONS; RADIATION
AB We present an up-to-date, comprehensive summary of the rates for all types of compact binary coalescence sources detectable by the initial and advanced versions of the ground-based gravitational-wave detectors LIGO and Virgo. Astrophysical estimates for compact-binary coalescence rates depend on a number of assumptions and unknown model parameters and are still uncertain. Themost confident among these estimates are the rate predictions for coalescing binary neutron stars which are based on extrapolations from observed binary pulsars in our galaxy. These yield a likely coalescence rate of 100 Myr(-1) per Milky Way Equivalent Galaxy (MWEG), although the rate could plausibly range from 1 Myr(-1) MWEG(-1) to 1000 Myr(-1) MWEG(-1) (Kalogera et al 2004 Astrophys. J. 601 L179; Kalogera et al 2004 Astrophys. J. 614 L137 ( erratum)). We convert coalescence rates into detection rates based on data from the LIGO S5 and Virgo VSR2 science runs and projected sensitivities for our advanced detectors. Using the detector sensitivities derived from these data, we find a likely detection rate of 0.02 per year for Initial LIGO-Virgo interferometers, with a plausible range between 2 x 10(-4) and 0.2 per year. The likely binary neutron-star detection rate for the Advanced LIGO-Virgo network increases to 40 events per year, with a range between 0.4 and 400 per year.
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[Brisson, V.; Cavalier, F.; Davier, M.; Hello, P.; Leroy, N.; Robinet, F.; Vavoulidis, M.; Wasa, M.] Univ Paris 11, LAL, IN2P3, CNRS, F-91898 Orsay, France.
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[Anderson, W. G.; Babak, S.; Behnke, B.; Gholami, I.; Grunewald, S.; Krishnan, B.; Papa, M. A.; Peralta, C.; Radke, T.; Robinson, E. L.; Santamaria, L.; Schutz, B. F.] Max Planck Inst Gravitat Phys, Albert Einstein Inst, D-14476 Golm, Germany.
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[Bulten, H. J.; Rabeling, D. S.; van den Branda, J. F. J.] Vrije Univ Amsterdam, NL-1081 HV Amsterdam, Netherlands.
[Benacquista, M.; Creighton, T. D.; Diaz, M.; Grosso, R.; Li, J.; Mohanty, S. D.; Mukherjee, S.; Quetschke, V.; Rakhmanov, M.; Romano, J. D.; Stone, R.; Vaishnav, B.] Univ Texas Brownsville & Texas Southmost Coll, Brownsville, TX 78520 USA.
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[Del Prete, M.; Mantovani, M.] Univ Siena, I-53100 Siena, Italy.
[Bilenko, I. A.; Braginsky, V. B.; Danilishin, S. L.; Gorodetsky, M. L.; Khalili, F. Y.; Mitrofanov, V. P.; Prokhorov, L.; Strigin, S.; Tarabrin, S. P.; Vyachanin, S. P.] Moscow MV Lomonosov State Univ, Moscow 119992, Russia.
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[Dari, A.; Gammaitoni, L.; Nawrodt, R.; Travasso, F.] Univ Perugia, I-6123 Perugia, Italy.
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[Rosinskag, D.] Inst Astron, PL-65265 Zielona Gora, Poland.
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[Chincarini, A.; Gemme, G.; Prato, M.] INFN, Sez Genova, I-16146 Genoa, Italy.
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[Coccia, E.; Fafone, V.; Morgia, A.] Univ Roma Tor Vergata, I-67100 Laquila, Italy.
[Emilio, M. Di Paolo; Pagliaroli, G.; Palladino, L.] Univ Aquila, I-67100 Laquila, Italy.
[Conte, R.; Postiglione, F.] Univ Salerno, I-84084 Salerno, Italy.
[Davis, A.; Gretarsson, A. M.; Zanolin, M.] Embry Riddle Aeronaut Univ, Prescott, AZ 86301 USA.
[Daw, E. J.; White, D. J.] Univ Sheffield, Sheffield S10 2TN, S Yorkshire, England.
[Dhurandhar, S.] Inter Univ, Ctr Astron & Astrophys, Pune 411007, Maharashtra, India.
[Doomes, E. E.; McGuire, S. C.] Southern Univ, Baton Rouge, LA 70813 USA.
[Doomes, E. E.; McGuire, S. C.] A&M Coll, Baton Rouge, LA 70813 USA.
[Dorsher, S.; Harms, J.; Kandhasamy, S.; Mandic, V.; Thrane, E.] Univ Minnesota, Minneapolis, MN 55455 USA.
[Prodi, G. A.; Re, V.] INFN, Grp Collegato Trento, I-38050 Padua, Italy.
[Prodi, G. A.; Re, V.] Univ Trent, I-38050 Padua, Italy.
[Dragocd, M.; Vedovato, G.] INFN, Sez Padova, I-35131 Padua, Italy.
[Dragocd, M.] Univ Padua, I-35131 Padua, Italy.
[Drever, R. W. P.] CALTECH, Pasadena, CA 91125 USA.
[Farr, B. F.; Fazi, D.; Kalogera, V.; Krishnamurthy, S.; Mandel, I.; Raymond, V.; van der Sluys, M. V.] Northwestern Univ, Evanston, IL 60208 USA.
[Flaminio, R.; Franc, J.; Mackowski, J. M.; Michel, C.; Morgado, N.; Pinard, L.; Sassolas, B.] Univ Lyon 1, CNRS, Lab Mat Avancs, IN2P3, F-69622 Villeurbanne, France.
[Forrest, C.; Melissinos, A. C.] Univ Rochester, Rochester, NY 14627 USA.
[Frei, M.; Krause, T.; Matzner, R. A.; McIvor, G.] Univ Texas Austin, Austin, TX 78712 USA.
[Frei, Z.; Raffai, P.] Eotvos Lorand Univ, ELTE, H-1053 Budapest, Hungary.
[Greenhalgh, R. J. S.; Nolting, D.; O'Dell, J.] Rutherford Appleton Lab, HSIC, Didcot OX11 0QX, Oxon, England.
[Hayama, K.; Kawamura, S.; Morioka, T.; Neri, I.; Sakata, S.; Sato, S.] Natl Inst Nat Sci, Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan.
[Hosken, D. J.; Munch, J.; Ottaway, D. J.; Veitch, P. J.] Univ Adelaide, Adelaide, SA 5005, Australia.
[Husa, S.; Sancho de la Jordana, L.; Sintes, A. M.; Trias, M.] Univ Illes Balears, E-07122 Palma de Mallorca, Spain.
[Jones, D. I.] Univ Southampton, Southampton SO17 1BJ, Hants, England.
[Khazanov, E. A.; Sergeev, A.] Inst Appl Phys, Nizhnii Novgorod 603950, Russia.
[Kim, C.] Lund Observ, SE-22100 Lund, Sweden.
[Lockerbie, N. A.; Tokmakov, K. V.] Univ Strathclyde, Glasgow G1 1XQ, Lanark, Scotland.
[Penn, S.] Hobart & William Smith Coll, Geneva, NY 14456 USA.
[Pinto, I. M.; Principe, M.] Univ Sannio Benevento, I-82100 Benevento, Italy.
[Reed, T.; Zotov, N.] Louisiana Tech Univ, Ruston, LA 71272 USA.
[Roberts, P.; Summerscales, T. Z.] Andrews Univ, Berrien Springs, MI 49104 USA.
[Santostasi, G.] McNeese State Univ, Lake Charles, LA 70609 USA.
[Smith, J. R.] Calif State Univ Fullerton, Fullerton, CA 92831 USA.
[Ugolini, D.] Trinity Univ, San Antonio, TX 78212 USA.
[Whelan, J. T.] Rochester Inst Technol, Rochester, NY 14623 USA.
[Yoshida, S.] SE Louisiana Univ, Hammond, LA 70402 USA.
[Belczynski, K.] Los Alamos Natl Lab, CCS 2, ISR Grp 1, Los Alamos, NM USA.
[Belczynski, K.] Univ Warsaw, Astron Observ, PL-00478 Warsaw, Poland.
RP Abadie, J (reprint author), CALTECH, LIGO, Pasadena, CA 91125 USA.
EM ilyamandel@chgk.info
RI Ferrante, Isidoro/F-1017-2012; Travasso, Flavio/J-9595-2016; Bartos,
Imre/A-2592-2017; Cella, Giancarlo/A-9946-2012; Cesarini,
Elisabetta/C-4507-2017; Frey, Raymond/E-2830-2016; Di Virgilio, Angela
Dora Vittoria/E-9078-2015; Sergeev, Alexander/F-3027-2017; Ward,
Robert/I-8032-2014; Neri, Igor/F-1482-2010; Hammond, Giles/B-7861-2009;
Shaddock, Daniel/A-7534-2011; Gammaitoni, Luca/B-5375-2009; Kawabe,
Keita/G-9840-2011; McClelland, David/E-6765-2010; Strain,
Kenneth/D-5236-2011; Martin, Iain/A-2445-2010; Lueck,
Harald/F-7100-2011; Kawazoe, Fumiko/F-7700-2011; Freise,
Andreas/F-8892-2011; Abernathy, Matthew/G-1113-2011; Marchesoni,
Fabio/A-1920-2008; Bondu, Francois/A-2071-2012; Toncelli,
Alessandra/A-5352-2012; Vocca, Helios/F-1444-2010; Prato,
Mirko/D-8531-2012; Hild, Stefan/A-3864-2010; prodi,
giovanni/B-4398-2010; Santamaria, Lucia/A-7269-2012; Costa,
Cesar/G-7588-2012; Prokhorov, Leonid/I-2953-2012; Gorodetsky,
Michael/C-5938-2008; Strigin, Sergey/I-8337-2012; Cuoco,
Elena/I-8789-2012; Vicere, Andrea/J-1742-2012; Mitrofanov,
Valery/D-8501-2012; Puppo, Paola/J-4250-2012; Colla,
Alberto/J-4694-2012; Rapagnani, Piero/J-4783-2012; Gemme,
Gianluca/C-7233-2008; Bilenko, Igor/D-5172-2012; Punturo,
Michele/I-3995-2012; Allen, Bruce/K-2327-2012; Chen, Yanbei/A-2604-2013;
Barker, David/A-5671-2013; Zhao, Chunnong/C-2403-2013; Ju,
Li/C-2623-2013; Parisi, Maria/D-2817-2013; Steinlechner,
Sebastian/D-5781-2013; Re, Virginia /F-6403-2013; Pitkin,
Matthew/I-3802-2013; Vyatchanin, Sergey/J-2238-2012; Miao,
Haixing/O-1300-2013; Khazanov, Efim/B-6643-2014; Salemi,
Francesco/F-6988-2014; Lucianetti, Antonio/G-7383-2014; Losurdo,
Giovanni/K-1241-2014; Danilishin, Stefan/K-7262-2012; Canuel,
Benjamin/C-7459-2014; Khalili, Farit/D-8113-2012; Vecchio,
Alberto/F-8310-2015; Mow-Lowry, Conor/F-8843-2015; Finn, Lee
Samuel/A-3452-2009; Ottaway, David/J-5908-2015; Postiglione,
Fabio/O-4744-2015; Rocchi, Alessio/O-9499-2015; Martelli,
Filippo/P-4041-2015; Gehring, Tobias/A-8596-2016; Howell,
Eric/H-5072-2014; mosca, simona/I-7116-2012; Frasconi,
Franco/K-1068-2016; Sigg, Daniel/I-4308-2015; Pinto,
Innocenzo/L-3520-2016; Harms, Jan/J-4359-2012
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Jonah/0000-0001-8115-0577; Garufi, Fabio/0000-0003-1391-6168;
Piergiovanni, Francesco/0000-0001-8063-828X; Granata,
Massimo/0000-0003-3275-1186; Aulbert, Carsten/0000-0002-1481-8319; Di
Paolo Emilio, Maurizio/0000-0002-9558-3610; PERSICHETTI,
GIANLUCA/0000-0001-8424-9791; Freise, Andreas/0000-0001-6586-9901;
Mandel, Ilya/0000-0002-6134-8946; Whiting, Bernard
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John/0000-0002-1521-3397; O'Shaughnessy, Richard/0000-0001-5832-8517;
Pathak, Devanka/0000-0002-1768-8353; Husa, Sascha/0000-0002-0445-1971;
Pinto, Innocenzo M./0000-0002-2679-4457; Guidi,
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Isidoro/0000-0002-0083-7228; Travasso, Flavio/0000-0002-4653-6156;
Cella, Giancarlo/0000-0002-0752-0338; Cesarini,
Elisabetta/0000-0001-9127-3167; Frey, Raymond/0000-0003-0341-2636; Di
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Piotr/0000-0001-8085-3414; Stein, Leo/0000-0001-7559-9597; Milano,
Leopoldo/0000-0001-9487-5876; Santamaria, Lucia/0000-0002-5986-0449;
Ward, Robert/0000-0001-5503-5241; Neri, Igor/0000-0002-9047-9822;
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Marchesoni, Fabio/0000-0001-9240-6793; Bondu,
Francois/0000-0001-6487-5197; Toncelli, Alessandra/0000-0003-4400-8808;
Vocca, Helios/0000-0002-1200-3917; Prato, Mirko/0000-0002-2188-8059;
prodi, giovanni/0000-0001-5256-915X; Gorodetsky,
Michael/0000-0002-5159-2742; Vicere, Andrea/0000-0003-0624-6231; Puppo,
Paola/0000-0003-4677-5015; Gemme, Gianluca/0000-0002-1127-7406; Punturo,
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Chunnong/0000-0001-5825-2401; Steinlechner,
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Miao, Haixing/0000-0003-4101-9958; Losurdo,
Giovanni/0000-0003-0452-746X; Danilishin, Stefan/0000-0001-7758-7493;
Vecchio, Alberto/0000-0002-6254-1617; Finn, Lee
Samuel/0000-0002-3937-0688; Postiglione, Fabio/0000-0003-0628-3796;
Rocchi, Alessio/0000-0002-1382-9016; Martelli,
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Howell, Eric/0000-0001-7891-2817; mosca, simona/0000-0001-7869-8275;
Frasconi, Franco/0000-0003-4204-6587; Sigg, Daniel/0000-0003-4606-6526;
FU Australian Research Council; Council of Scientific and Industrial
Research of India; Istituto Nazionale di Fisica Nucleare of Italy;
Spanish Ministerio de Educacion y Ciencia; Conselleria d'Economia
Hisenda i Innovacio of the Govern de les Illes Balears; Netherlands
Organisation for Scientific Research; Polish Ministry of Science and
Higher Education; Foundation for Polish Science; Royal Society; Scottish
Funding Council; Scottish Universities Physics Alliance; National
Aeronautics and Space Administration; Carnegie Trust; Leverhulme Trust;
David and Lucile Packard Foundation; Research Corporation and the Alfred
P Sloan Foundation; European Commission
FX The authors gratefully acknowledge the support of the United States
National Science Foundation for the construction and operation of the
LIGO Laboratory, the Science and Technology Facilities Council of the
United Kingdom, the Max-Planck-Society, the State of
Niedersachsen/Germany for support of the construction and operation of
the GEO600 detector, and the Italian Istituto Nazionale di Fisica
Nucleare and the French Centre National de la Recherche Scientifique for
the construction and operation of the Virgo detector. The authors also
gratefully acknowledge the support of the research by these agencies and
by the Australian Research Council, the Council of Scientific and
Industrial Research of India, the Istituto Nazionale di Fisica Nucleare
of Italy, the Spanish Ministerio de Educacion y Ciencia, the Conselleria
d'Economia Hisenda i Innovacio of the Govern de les Illes Balears, the
Foundation for Fundamental Research on Matter supported by the
Netherlands Organisation for Scientific Research, the Polish Ministry of
Science and Higher Education, the FOCUS Programme of Foundation for
Polish Science, the Royal Society, the Scottish Funding Council, the
Scottish Universities Physics Alliance, The National Aeronautics and
Space Administration, the Carnegie Trust, the Leverhulme Trust, the
David and Lucile Packard Foundation, the Research Corporation and the
Alfred P Sloan Foundation. One of us (CK) would like to acknowledge the
European Commission.
NR 60
TC 619
Z9 619
U1 21
U2 139
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0264-9381
J9 CLASSICAL QUANT GRAV
JI Class. Quantum Gravity
PD SEP 7
PY 2010
VL 27
IS 17
AR 173001
DI 10.1088/0264-9381/27/17/173001
PG 25
WC Astronomy & Astrophysics; Physics, Multidisciplinary; Physics, Particles
& Fields
SC Astronomy & Astrophysics; Physics
GA 631AC
UT WOS:000280317700001
ER
PT J
AU Zitney, SE
AF Zitney, Stephen E.
TI Process/equipment co-simulation for design and analysis of advanced
energy systems
SO COMPUTERS & CHEMICAL ENGINEERING
LA English
DT Article; Proceedings Paper
CT 7th International Conference on the Foundations of Computer-Aided
Process Design
CY JUN 07-12, 2009
CL Breckenridge, CO
DE Process simulation; Computational fluid dynamics; Co-simulation; Virtual
engineering; Fossil energy
ID PROPER-ORTHOGONAL DECOMPOSITION; COMPUTATIONAL FLUID-DYNAMICS; HYBRID
MULTIZONAL/CFD MODELS; REACTOR NETWORK ANALYSIS; REDUCED-ORDER MODEL;
GENERAL METHODOLOGY; CFD; OPTIMIZATION; PREDICTION; FRAMEWORK
AB The grand challenge facing the power and energy industries is the development of efficient, environmentally friendly, and affordable technologies for next-generation energy systems. To provide solutions for energy and the environment, the U.S. Department of Energy's (DOE) National Energy Technology Laboratory (NETL) and its research partners in industry and academia are relying increasingly on the use of sophisticated computer-aided process design and optimization tools. In this paper, we describe recent progress toward developing an Advanced Process Engineering Co-Simulator (APECS) for the high-fidelity design, analysis, and optimization of energy plants. The APECS software system combines steady-state process simulation with multiphysics-based equipment simulations, such as those based on computational fluid dynamics (CFD). These co-simulation capabilities enable design engineers to optimize overall process performance with respect to complex thermal and fluid flow phenomena arising in key plant equipment items, such as combustors, gasifiers, turbines, and carbon capture devices. In this paper we review several applications of the APECS co-simulation technology to advanced energy systems, including coal-fired energy plants with carbon capture. This paper also discusses ongoing co-simulation R&D activities and challenges in areas such as CFD-based reduced-order modeling, knowledge management, advanced analysis and optimization, and virtual plant co-simulation. Continued progress in co-simulation technology - through improved integration, solution, and deployment - will have profound positive impacts on the design and optimization of high-efficiency, near-zero emission fossil energy systems. Published by Elsevier Ltd.
C1 US DOE, Collaboratory Proc & Dynam Syst Res, Natl Energy Technol Lab, Morgantown, WV 26507 USA.
RP Zitney, SE (reprint author), US DOE, Collaboratory Proc & Dynam Syst Res, Natl Energy Technol Lab, 3610 Collins Ferry Rd, Morgantown, WV 26507 USA.
EM Stephen.Zitney@NETL.DOE.GOV
NR 71
TC 18
Z9 19
U1 0
U2 5
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0098-1354
J9 COMPUT CHEM ENG
JI Comput. Chem. Eng.
PD SEP 7
PY 2010
VL 34
IS 9
SI SI
BP 1532
EP 1542
DI 10.1016/j.compchemeng.2010.02.011
PG 11
WC Computer Science, Interdisciplinary Applications; Engineering, Chemical
SC Computer Science; Engineering
GA 634ZM
UT WOS:000280625200024
ER
PT J
AU Farley, DR
AF Farley, David R.
TI Calculation of ground state rotational populations for kinetic gas
homonuclear diatomic molecules including electron-impact excitation and
wall collisions
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE Boltzmann equation; electron impact excitation; ground states;
molecule-electron collisions; rotational states
ID FRANCK-CONDON FACTORS; DISSOCIATIVE ATTACHMENT; HYDROGEN MOLECULES;
ASSOCIATIVE DESORPTION; CROSS-SECTIONS; H-2; SCATTERING; DYNAMICS
AB A model has been developed to calculate the ground state rotational populations of homonuclear diatomic molecules in kinetic gases, including the effects of electron-impact excitation, wall collisions, and gas feed rate. The equations are exact within the accuracy of the cross sections used and of the assumed equilibrating effect of wall collisions. It is found that the inflow of feed gas and equilibrating wall collisions can significantly affect the rotational distribution in competition with nonequilibrating electron-impact effects. The resulting steady-state rotational distributions are generally Boltzmann for N >= 3, with a rotational temperature between the wall and feed gas temperatures. The N=0,1,2 rotational level populations depend sensitively on the relative rates of electron-impact excitation versus wall collision and gas feed rates. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3475000]
C1 Princeton Plasma Phys Lab, Princeton, NJ 08543 USA.
RP Farley, DR (reprint author), Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA.
EM dfarley@pppl.gov
FU U.S. Department of Energy [DE-AC02-76-CHO-3073]
FX The author wishes to express his thanks and gratitude to Dr. Samuel
Cohen for useful discussions. This work was supported, in part, by the
U.S. Department of Energy Contract No. DE-AC02-76-CHO-3073.
NR 43
TC 2
Z9 2
U1 0
U2 1
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 SEP 7
PY 2010
VL 133
IS 9
AR 094303
DI 10.1063/1.3475000
PG 8
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 649BX
UT WOS:000281742900009
PM 20831314
ER
PT J
AU Sheppard, D
Henkelman, G
von Lilienfeld, OA
AF Sheppard, Daniel
Henkelman, Graeme
von Lilienfeld, O. Anatole
TI Alchemical derivatives of reaction energetics (vol 133, 084104, 2010)
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Correction
C1 [Sheppard, Daniel; Henkelman, Graeme] Univ Texas Austin, Dept Chem & Biochem, Austin, TX 78712 USA.
[Sheppard, Daniel; Henkelman, Graeme] Univ Texas Austin, Inst Computat Engn & Sci, Austin, TX 78712 USA.
[von Lilienfeld, O. Anatole] Sandia Natl Labs, Dept Multiscale Dynam Mat Modeling, Albuquerque, NM 87185 USA.
RP Sheppard, D (reprint author), Univ Texas Austin, Dept Chem & Biochem, Austin, TX 78712 USA.
RI Henkelman, Graeme/A-9301-2008
OI Henkelman, Graeme/0000-0002-0336-7153
NR 1
TC 0
Z9 0
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 SEP 7
PY 2010
VL 133
IS 9
AR 099901
DI 10.1063/1.3490336
PG 1
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 649BX
UT WOS:000281742900035
ER
PT J
AU Biener, J
Wittstock, A
Biener, MM
Nowitzki, T
Hamza, AV
Baeumer, M
AF Biener, Juergen
Wittstock, Arne
Biener, Monika M.
Nowitzki, Tobias
Hamza, Alex V.
Baeumer, Marcus
TI Effect of Surface Chemistry on the Stability of Gold Nanostructures
SO LANGMUIR
LA English
DT Article
ID THIN-FILM GROWTH; NANOPOROUS GOLD; ION-BOMBARDMENT; LOW-TEMPERATURE;
AU(111); AU; OXYGEN; IRRADIATION; NUCLEATION; EVOLUTION
AB Understanding the role of surface chemistry in the stability of nanostructured noble-metal materials is important for many technological applications but experimentally difficult to access and thus little understood. To develop a fundamental understanding of the effect of surface chemistry on both the formation and stabilization of self-organized gold nanostructures, we performed a series of controlled-environment annealing experiments on nanoporous gold (np-Au) and ion-bombarded Au(111) single-crystal surfaces. The annealing experiments on np-Au in ambient ozone were carried out to study the effect of adsorbed oxygen under dynamic conditions, whereas the ion-bombarded Au single-crystal surfaces were used as a model system to obtain atomic-scale information. Our results show that adsorbed oxygen stabilizes nanoscale gold structures at low temperatures whereas oxygen-induced mobilization of Au surface atoms seems to accelerate the coarsening under dynamic equilibrium conditions at higher temperatures.
C1 [Biener, Juergen; Biener, Monika M.; Hamza, Alex V.] Lawrence Livermore Natl Lab, Nanoscale Synth & Characterizat Lab, Livermore, CA 94550 USA.
[Wittstock, Arne; Nowitzki, Tobias; Baeumer, Marcus] Univ Bremen, Inst Appl & Phys Chem, D-28359 Bremen, Germany.
RP Biener, J (reprint author), Lawrence Livermore Natl Lab, Nanoscale Synth & Characterizat Lab, 700 East Ave, Livermore, CA 94550 USA.
EM biener2@llnl.gov; awittstock@uni-bremen.de
RI Baumer, Marcus/S-5441-2016
OI Baumer, Marcus/0000-0002-8620-1764
FU U.S. DOE [DE-AC52-07NA27344]; Hanse-Wissenschaftskolleg, Germany
FX Work at LLNL was performed under the auspices of the U.S. DOE by LLNL
under contract DE-AC52-07NA27344. J.B. gratefully acknowledges financial
support from the Hanse-Wissenschaftskolleg, Germany. We gratefully
acknowledge the experimental support (SEM) of Ardalan Zargham and Torben
Rohbeck (Prof. Falta and Prof. Hommel, Institute for Solid State
Physics, University Bremen) and Petra Witte (Prof. Fischer,
Crystallography, Geology Department, University Bremen).
NR 43
TC 27
Z9 27
U1 1
U2 31
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0743-7463
J9 LANGMUIR
JI Langmuir
PD SEP 7
PY 2010
VL 26
IS 17
BP 13736
EP 13740
DI 10.1021/la1019422
PG 5
WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science,
Multidisciplinary
SC Chemistry; Materials Science
GA 644DX
UT WOS:000281354000003
PM 20669912
ER
PT J
AU Deacon, AN
Smith, JF
Freeman, SJ
Janssens, RVF
Carpenter, MP
Hadinia, B
Hoffman, CR
Kay, BP
Lauritsen, T
Lister, CJ
O'Donnell, D
Ollier, J
Otsuka, T
Seweryniak, D
Spohr, KM
Steppenbeck, D
Tabor, SL
Tripathi, V
Utsuno, Y
Wady, PT
Zhu, S
AF Deacon, A. N.
Smith, J. F.
Freeman, S. J.
Janssens, R. V. F.
Carpenter, M. P.
Hadinia, B.
Hoffman, C. R.
Kay, B. P.
Lauritsen, T.
Lister, C. J.
O'Donnell, D.
Ollier, J.
Otsuka, T.
Seweryniak, D.
Spohr, K. -M.
Steppenbeck, D.
Tabor, S. L.
Tripathi, V.
Utsuno, Y.
Wady, P. T.
Zhu, S.
TI Cross-shell excitations near the "island of inversion": Structure of
Mg-30
SO PHYSICAL REVIEW C
LA English
DT Article
ID RICH SODIUM ISOTOPES; BETA-DECAY; NUCLEI; SPECTROSCOPY
AB Excited states in Mg-30 have been populated to similar to 6 (h) over bar and 5MeV excitation energy with the C-14(O-18, 2p) reaction. Firm spin assignments for states with J > 2 (h) over bar h have been made in this nucleus. The level scheme is compared to shell-model calculations using the Universal sd effective interaction and the Monte Carlo shell model method. Calculations employing a full sd model space fail to reproduce the observed levels. The results indicate that excitations across the N = 20 gap are required at relatively low excitation energy to achieve a description of the data. The incorporation of the f(7/2) and p(3/2) orbitals into the model space gives improved results but indicate the need for further refinement of the models to reproduce the observed spectra.
C1 [Deacon, A. N.; Freeman, S. J.; Steppenbeck, D.] Univ Manchester, Schuster Lab, Manchester M13 9PL, Lancs, England.
[Smith, J. F.; Hadinia, B.; O'Donnell, D.; Ollier, J.; Spohr, K. -M.; Wady, P. T.] Univ W Scotland, Paisley PA1 2BE, Renfrew, Scotland.
[Janssens, R. V. F.; Carpenter, M. P.; Kay, B. P.; Lauritsen, T.; Lister, C. J.; Seweryniak, D.; Zhu, S.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Hoffman, C. R.; Tabor, S. L.; Tripathi, V.] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA.
[Otsuka, T.] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan.
[Otsuka, T.] Univ Tokyo, Ctr Nucl Study, Bunkyo Ku, Tokyo 1130033, Japan.
[Utsuno, Y.] Japan Atom Energy Agcy, Tokai, Ibaraki 3191195, Japan.
RP Deacon, AN (reprint author), Univ Manchester, Schuster Lab, Manchester M13 9PL, Lancs, England.
EM alick.deacon@manchester.ac.uk
RI Kay, Benjamin/F-3291-2011; Freeman, Sean/B-1280-2010; O'Donnell,
David/J-7786-2013; OTSUKA, TAKAHARU/G-5072-2014; Carpenter,
Michael/E-4287-2015
OI Kay, Benjamin/0000-0002-7438-0208; Freeman, Sean/0000-0001-9773-4921;
O'Donnell, David/0000-0002-4710-3803; Carpenter,
Michael/0000-0002-3237-5734
FU US Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357];
UK Science and Technology Facilities Council; US National Science
Foundation [PHY-01-01253, PHY-0456463, PHY-07-56474]; Scottish
Universities Physics Alliance; RIKEN
FX This work was supported by the US Department of Energy, Office of
Nuclear Physics, under Contract No. DE-AC02-06CH11357, by the UK Science
and Technology Facilities Council, by US National Science Foundation
Grants No. PHY-01-01253, No. PHY-0456463, and No. PHY-07-56474, and by
the Scottish Universities Physics Alliance. The authors are grateful to
the group at Birmingham University for the loan of the 14C
target. DS acknowledges financial support from RIKEN.
NR 28
TC 11
Z9 11
U1 0
U2 4
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 SEP 7
PY 2010
VL 82
IS 3
AR 034305
DI 10.1103/PhysRevC.82.034305
PG 7
WC Physics, Nuclear
SC Physics
GA 647UC
UT WOS:000281643900004
ER
PT J
AU Randrup, J
AF Randrup, Jorgen
TI Spinodal phase separation in relativistic nuclear collisions
SO PHYSICAL REVIEW C
LA English
DT Article
ID INSTABILITIES; DECOMPOSITION; TRANSITIONS
AB The spinodal amplification of density fluctuations is treated perturbatively within dissipative fluid dynamics for the purpose of elucidating the prospects for this mechanism to cause a phase separation to occur during a relativistic nuclear collision. The present study includes not only viscosity but also heat conduction (whose effect on the growth rates is of comparable magnitude but opposite), as well as a gradient term in the local pressure, and the corresponding dispersion relation for collective modes in bulk matter is derived from relativistic fluid dynamics. A suitable two-phase equation of state is obtained by interpolation between a hadronic gas and a quark-gluon plasma, while the transport coefficients are approximated by simple parametrizations that are suitable at any degree of net baryon density. We calculate the degree of spinodal amplification occurring along specific dynamical phase trajectories characteristic of nuclear collision at various energies. The results bring out the important fact that the prospects for spinodal phase separation to occur can be greatly enhanced by careful tuning of the collision energy to ensure that the thermodynamic conditions associated with the maximum compression lie inside the region of spinodal instability.
C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
RP Randrup, J (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Nucl Sci, Berkeley, CA 94720 USA.
FU Office of Energy Research, Office of High Energy and Nuclear Physics,
Nuclear Physics Division of the US Department of Energy
[DE-AC02-05CH11231]
FX We acknowledge helpful discussions with V. Koch, J. Liao, H. C. Song,
and D. N. Voskresensky. This work was supported by the Director, Office
of Energy Research, Office of High Energy and Nuclear Physics, Nuclear
Physics Division of the US Department of Energy under Contract No.
DE-AC02-05CH11231.
NR 31
TC 36
Z9 38
U1 1
U2 2
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 SEP 7
PY 2010
VL 82
IS 3
AR 034902
DI 10.1103/PhysRevC.82.034902
PG 14
WC Physics, Nuclear
SC Physics
GA 647UC
UT WOS:000281643900006
ER
PT J
AU Parks, HV
Faller, JE
AF Parks, Harold V.
Faller, James E.
TI Simple Pendulum Determination of the Gravitational Constant
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID FUNDAMENTAL PHYSICAL CONSTANTS; TORSION BALANCE
AB We determined the Newtonian constant of gravitation G by interferometrically measuring the change in spacing between two free-hanging pendulum masses caused by the gravitational field from large tungsten source masses. We find a value for G of (6.67234 +/- 0.00014) x 10(-11) m(3) kg(-1) s(-2). This value is in good agreement with the 1986 Committee on Data for Science and Technology (CODATA) value of (6.672 59 +/- 0.00085) x 10(-11) m(3) kg(-1) s(-2) [Rev. Mod. Phys. 59, 1121 (1987)] but differs from some more recent determinations as well as the latest CODATA recommendation of (6.67428 +/- 0.00067) x 10(-11) m(3) kg(-1) s(-2) [Rev. Mod. Phys. 80, 633 (2008)].
C1 [Parks, Harold V.; Faller, James E.] Univ Colorado, JILA, Boulder, CO 80309 USA.
[Parks, Harold V.; Faller, James E.] Natl Inst Stand & Technol, Boulder, CO 80309 USA.
[Parks, Harold V.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Parks, HV (reprint author), Univ Colorado, JILA, Boulder, CO 80309 USA.
EM hvparks@sandia.gov
FU National Research Council; U.S. Department of Energy's National Nuclear
Security Administration [DE-AC04-94AL85000]
FX We thank Douglas S. Robertson for writing software to provide an
independent check of our gravity field calculations as well as Hans
Green, Blaine Horner, and Alan Patee for creating the apparatus. We also
thank Terry Quinn and Richard Davis for many helpful discussions. H.P.
is grateful to the National Research Council for financial support.
Sandia National Laboratories is a multiprogram laboratory operated by
Sandia Corporation, a wholly owned subsidiary of Lockheed Martin
company, for the U.S. Department of Energy's National Nuclear Security
Administration under Contract No. DE-AC04-94AL85000.
NR 14
TC 35
Z9 37
U1 1
U2 17
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 SEP 7
PY 2010
VL 105
IS 11
AR 110801
DI 10.1103/PhysRevLett.105.110801
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 647UO
UT WOS:000281645200002
PM 20867560
ER
PT J
AU Wood, MH
Nasseripour, R
Paolone, M
Djalali, C
Weygand, DP
Adhikari, KP
Anghinolfi, M
Ball, J
Battaglieri, M
Batourine, V
Bedlinskiy, I
Bellis, M
Berman, BL
Biselli, AS
Branford, D
Briscoe, WJ
Brooks, WK
Burkert, VD
Careccia, SL
Carman, DS
Cole, PL
Collins, P
Crede, V
D'Angelo, A
Daniel, A
De Vita, R
De Sanctis, E
Deur, A
Dey, B
Dhamija, S
Dickson, R
Doughty, D
Dupre, R
Egiyan, H
El Alaoui, A
El Fassi, L
Eugenio, P
Fegan, S
Gabrielyan, MY
On, MG
Gilfoyle, GP
Giovanetti, KL
Girod, FX
Goetz, JT
Gohn, W
Gothe, RW
Graham, L
Guidal, M
Guo, L
Hafidi, K
Hakobyan, H
Hanretty, C
Hassall, N
Hicks, K
Holtrop, M
Ilieva, Y
Ireland, DG
Ishkhanov, BS
Jawalkar, SS
Jo, HS
Joo, K
Keller, D
Khandaker, M
Khetarpal, P
Kim, A
Kim, W
Klein, A
Klein, FJ
Konczykowski, P
Kubarovsky, V
Kuleshov, SV
Kuznetsov, V
Livingston, K
Martinez, D
Mayer, M
McAndrew, J
McCracken, ME
McKinnon, B
Meyer, CA
Mineeva, T
Mirazita, M
Mokeev, V
Moreno, B
Moriya, K
Morrison, B
Munevar, E
Nadel-Turonski, P
Ni, A
Niccolai, S
Niculescu, G
Niculescu, I
Niroula, MR
Osipenko, M
Ostrovidov, AI
Paremuzyan, R
Park, K
Park, S
Pasyuk, E
Pereira, SA
Pisano, S
Pogorelko, O
Pozdniakov, S
Price, JW
Procureur, S
Prok, Y
Protopopescu, D
Raue, BA
Ricco, G
Ripani, M
Rosner, G
Rossi, P
Sabatie, F
Saini, MS
Salamanca, J
Salgado, C
Schott, D
Schumacher, RA
Seder, E
Seraydaryan, H
Sharabian, YG
Smith, GD
Sober, DI
Sokhan, D
Stepanyan, S
Stepanyan, SS
Stoler, P
Strakovsky, II
Strauch, S
Taiuti, M
Tang, W
Taylor, CE
Tedeschi, DJ
Tkachenko, S
Ungaro, M
Vernarsky, B
Vineyard, MF
Voutier, E
Watts, DP
Weinstein, LB
Zhang, J
Zhao, B
Zhao, ZW
AF Wood, M. H.
Nasseripour, R.
Paolone, M.
Djalali, C.
Weygand, D. P.
Adhikari, K. P.
Anghinolfi, M.
Ball, J.
Battaglieri, M.
Batourine, V.
Bedlinskiy, I.
Bellis, M.
Berman, B. L.
Biselli, A. S.
Branford, D.
Briscoe, W. J.
Brooks, W. K.
Burkert, V. D.
Careccia, S. L.
Carman, D. S.
Cole, P. L.
Collins, P.
Crede, V.
D'Angelo, A.
Daniel, A.
De Vita, R.
De Sanctis, E.
Deur, A.
Dey, B.
Dhamija, S.
Dickson, R.
Doughty, D.
Dupre, R.
Egiyan, H.
El Alaoui, A.
El Fassi, L.
Eugenio, P.
Fegan, S.
Gabrielyan, M. Y.
On, M. Garc
Gilfoyle, G. P.
Giovanetti, K. L.
Girod, F. X.
Goetz, J. T.
Gohn, W.
Gothe, R. W.
Graham, L.
Guidal, M.
Guo, L.
Hafidi, K.
Hakobyan, H.
Hanretty, C.
Hassall, N.
Hicks, K.
Holtrop, M.
Ilieva, Y.
Ireland, D. G.
Ishkhanov, B. S.
Jawalkar, S. S.
Jo, H. S.
Joo, K.
Keller, D.
Khandaker, M.
Khetarpal, A.
Kim, A.
Kim, W.
Klein, A.
Klein, F. J.
Konczykowski, P.
Kubarovsky, V.
Kuleshov, S. V.
Kuznetsov, V.
Livingston, K.
Martinez, D.
Mayer, M.
McAndrew, J.
McCracken, M. E.
McKinnon, B.
Meyer, C. A.
Mineeva, T.
Mirazita, M.
Mokeev, V.
Moreno, B.
Moriya, K.
Morrison, B.
Munevar, E.
Nadel-Turonski, P.
Ni, A.
Niccolai, S.
Niculescu, G.
Niculescu, I.
Niroula, M. R.
Osipenko, M.
Ostrovidov, A. I.
Paremuzyan, R.
Park, K.
Park, S.
Pasyuk, E.
Pereira, S. Anefalos
Pisano, S.
Pogorelko, O.
Pozdniakov, S.
Price, J. W.
Procureur, S.
Prok, Y.
Protopopescu, D.
Raue, B. A.
Ricco, G.
Ripani, M.
Rosner, G.
Rossi, P.
Sabatie, F.
Saini, M. S.
Salamanca, J.
Salgado, C.
Schott, D.
Schumacher, R. A.
Seder, E.
Seraydaryan, H.
Sharabian, Y. G.
Smith, G. D.
Sober, D. I.
Sokhan, D.
Stepanyan, S.
Stepanyan, S. S.
Stoler, P.
Strakovsky, I. I.
Strauch, S.
Taiuti, M.
Tang, W.
Taylor, C. E.
Tedeschi, D. J.
Tkachenko, S.
Ungaro, M.
Vernarsky, B.
Vineyard, M. F.
Voutier, E.
Watts, D. P.
Weinstein, L. B.
Zhang, J.
Zhao, B.
Zhao, Z. W.
CA CLAS Collaboration
TI Absorption of the omega and phi Mesons in Nuclei
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID RHO-MESON; MATTER; PHOTOPRODUCTION; PROPAGATION; PHOTON; DECAY; MASS
AB Because of their long lifetimes, the omega and phi mesons are the ideal candidates for the study of possible modifications of the in-medium meson-nucleon interaction through their absorption inside the nucleus. During the E01-112 experiment at the Thomas Jefferson National Accelerator Facility, the mesons were photoproduced from (2)H, C, Ti, Fe, and Pb targets. This Letter reports the first measurement of the ratio of nuclear transparencies for the e(+)e(-) channel. The ratios indicate larger in-medium widths compared with what have been reported in other reaction channels. The absorption of the omega meson is stronger than that reported by the CBELSA-TAPS experiment and cannot be explained by recent theoretical models.
C1 [Wood, M. H.] Canisius Coll, Buffalo, NY 14208 USA.
[Nasseripour, R.; Berman, B. L.; Briscoe, W. J.; Ilieva, Y.; Munevar, E.; Strakovsky, I. I.; Strauch, S.] George Washington Univ, Washington, DC 20052 USA.
[Wood, M. H.; Paolone, M.; Djalali, C.; Gothe, R. W.; Graham, L.; Ilieva, Y.; Park, K.; Strauch, S.; Tedeschi, D. J.; Tkachenko, S.; Zhao, Z. W.] Univ S Carolina, Columbia, SC 29208 USA.
[Weygand, D. P.; Batourine, V.; Brooks, W. K.; Burkert, V. D.; Carman, D. S.; Cole, P. L.; Deur, A.; Doughty, D.; Guo, L.; Kubarovsky, V.; Mokeev, V.; Nadel-Turonski, P.; Pasyuk, E.; Raue, B. A.; Sharabian, Y. G.; Stepanyan, S.] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
[Dupre, R.; El Alaoui, A.; El Fassi, L.; Hafidi, K.] Argonne Natl Lab, Argonne, IL 60441 USA.
[Collins, P.; Morrison, B.; Pasyuk, E.] Arizona State Univ, Tempe, AZ 85287 USA.
[Goetz, J. T.] Univ Calif Los Angeles, Los Angeles, CA 90095 USA.
[Price, J. W.] Calif State Univ Dominguez Hills, Carson, CA 90747 USA.
[Bellis, M.; Biselli, A. S.; Dey, B.; Dickson, R.; McCracken, M. E.; Meyer, C. A.; Moriya, K.; Schumacher, R. A.; Vernarsky, B.] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA.
[Klein, F. J.; Sober, D. I.] Catholic Univ Amer, Washington, DC 20064 USA.
[Ball, J.; On, M. Garc; Girod, F. X.; Konczykowski, P.; Moreno, B.; Procureur, S.; Sabatie, F.; Zhao, B.] CEA, Ctr Saclay, Irfu Serv Phys Nucl, F-91191 Gif Sur Yvette, France.
[Doughty, D.] Christopher Newport Univ, Newport News, VA 23606 USA.
[Gohn, W.; Joo, K.; Mineeva, T.; Seder, E.; Ungaro, M.; Zhao, B.] Univ Connecticut, Storrs, CT 06269 USA.
[Branford, D.; McAndrew, J.; Watts, D. P.] Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland.
[Biselli, A. S.] Fairfield Univ, Fairfield, CT 06824 USA.
[Dhamija, S.; Gabrielyan, M. Y.; Raue, B. A.; Schott, D.] Florida Int Univ, Miami, FL 33199 USA.
[Crede, V.; Eugenio, P.; Hanretty, C.; Ostrovidov, A. I.; Park, S.; Saini, M. S.] Florida State Univ, Tallahassee, FL 32306 USA.
[Cole, P. L.; Martinez, D.; Salamanca, J.; Taylor, C. E.] Idaho State Univ, Pocatello, ID 83209 USA.
[De Sanctis, E.; Mirazita, M.; Pereira, S. Anefalos; Rossi, P.] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy.
[Anghinolfi, M.; Battaglieri, M.; De Vita, R.; Osipenko, M.; Ricco, G.; Ripani, M.; Taiuti, M.] Ist Nazl Fis Nucl, Sez Genova, I-16146 Genoa, Italy.
[D'Angelo, A.] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy.
[Guidal, M.; Jo, H. S.; Niccolai, S.; Pisano, S.; Sokhan, D.] Inst Phys Nucl ORSAY, Orsay, France.
[Bedlinskiy, I.; Kuleshov, S. V.; Pogorelko, O.; Pozdniakov, S.] Inst Theoret & Expt Phys, Moscow 117259, Russia.
[Giovanetti, K. L.; Niculescu, G.; Niculescu, I.] James Madison Univ, Harrisonburg, VA 22807 USA.
[Khetarpal, A.; Kim, W.; Kuznetsov, V.; Ni, A.; Park, K.; Stepanyan, S. S.] Kyungpook Natl Univ, Taegu 702701, South Korea.
[Voutier, E.] Univ Joseph Fourier, CNRS, IN2P3,INPG, LPSC, Grenoble, France.
[Egiyan, H.; Holtrop, M.; Protopopescu, D.] Univ New Hampshire, Durham, NH 03824 USA.
[Khandaker, M.; Salgado, C.] Norfolk State Univ, Norfolk, VA 23504 USA.
[Khandaker, M.; Salgado, C.] Ohio Univ, Athens, OH 45701 USA.
[Daniel, A.; Hicks, K.; Keller, D.; Tang, W.] Old Dominion Univ, Norfolk, VA 23529 USA.
[Adhikari, K. P.; Careccia, S. L.; Klein, A.; Mayer, M.; Niroula, M. R.; Seraydaryan, H.; Weinstein, L. B.; Zhang, J.] Old Dominion Univ, Norfolk, VA 23529 USA.
[Kubarovsky, V.; Stoler, P.; Ungaro, M.] Rensselaer Polytechn Inst, Troy, NY 12180 USA.
[Gilfoyle, G. P.] Univ Richmond, Richmond, VA 23173 USA.
[D'Angelo, A.] Univ Roma Tor Vergata, I-00133 Rome, Italy.
[Ishkhanov, B. S.; Mokeev, V.] Skobeltsyn Nucl Phys Inst, Moscow 119899, Russia.
[Vineyard, M. F.] Union Coll, Schenectady, NY 12308 USA.
[Brooks, W. K.; Hakobyan, H.; Joo, K.; Kuleshov, S. V.] Univ Tecnica Feder Santa Maria, Valparaiso 110V, Chile.
[Fegan, S.; Hassall, N.; Ireland, D. G.; Livingston, K.; McKinnon, B.; Protopopescu, D.; Rosner, G.; Smith, G. D.] Univ Glasgow, Glasgow G12 8QQ, Lanark, Scotland.
[Prok, Y.] Univ Virginia, Charlottesville, VA 22901 USA.
[Jawalkar, S. S.] Coll William & Mary, Williamsburg, VA 23187 USA.
[Hakobyan, H.; Paremuzyan, R.] Yerevan Phys Inst, Yerevan 375036, Armenia.
RP Wood, MH (reprint author), Canisius Coll, Buffalo, NY 14208 USA.
RI Osipenko, Mikhail/N-8292-2015; Zhang, Jixie/A-1461-2016; Protopopescu,
Dan/D-5645-2012; Ishkhanov, Boris/E-1431-2012; Zhao, Bo/J-6819-2012;
Brooks, William/C-8636-2013; Kuleshov, Sergey/D-9940-2013; Schumacher,
Reinhard/K-6455-2013; D'Angelo, Annalisa/A-2439-2012; Meyer,
Curtis/L-3488-2014; El Alaoui, Ahmed/B-4638-2015; Sabatie,
Franck/K-9066-2015; Ireland, David/E-8618-2010
OI Osipenko, Mikhail/0000-0001-9618-3013; Bellis,
Matthew/0000-0002-6353-6043; Zhao, Bo/0000-0003-3171-5335; Brooks,
William/0000-0001-6161-3570; Kuleshov, Sergey/0000-0002-3065-326X;
Schumacher, Reinhard/0000-0002-3860-1827; D'Angelo,
Annalisa/0000-0003-3050-4907; Meyer, Curtis/0000-0001-7599-3973;
Sabatie, Franck/0000-0001-7031-3975; Ireland, David/0000-0001-7713-7011
FU U.S. Department of Energy [DE-AC05-84ER40150]; National Science
Foundation; Research Corporation; Italian Istituto Nazionale di Fisica
Nucleare; French Centre National de la Recherche Scientifique; French
Commissariat a l'Energie Atomique; National Research Foundation of
Korea; U.K. Science and Technology Facilities Council (STFC); Deutsche
Forschungsgemeinschaft; Chilean Comision Nacional de Investigacion
Cientifica y Tecnologica (CONICYT)
FX We would like to thank the staff of the Accelerator and Physics
Divisions at JLab. This work was supported in part by the U.S.
Department of Energy, the National Science Foundation, the Research
Corporation, the Italian Istituto Nazionale di Fisica Nucleare, the
French Centre National de la Recherche Scientifique, the French
Commissariat a l'Energie Atomique, the National Research Foundation of
Korea, the U.K. Science and Technology Facilities Council (STFC),
Deutsche Forschungsgemeinschaft, and the Chilean Comision Nacional de
Investigacion Cientifica y Tecnologica (CONICYT). Jefferson Science
Associates (JSA) operates JLab for the U.S. Department of Energy under
contract DE-AC05-84ER40150.
NR 38
TC 39
Z9 39
U1 1
U2 4
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 SEP 7
PY 2010
VL 105
IS 11
AR 112301
DI 10.1103/PhysRevLett.105.112301
PG 6
WC Physics, Multidisciplinary
SC Physics
GA 647UO
UT WOS:000281645200005
PM 20867566
ER
PT J
AU Bruce, R
Jowett, JM
Blaskiewicz, M
Fischer, W
AF Bruce, R.
Jowett, J. M.
Blaskiewicz, M.
Fischer, W.
TI Time evolution of the luminosity of colliding heavy-ion beams in BNL
Relativistic Heavy Ion Collider and CERN Large Hadron Collider
SO PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS
LA English
DT Article
AB We have studied the time evolution of the heavy-ion luminosity and bunch intensities in the Relativistic Heavy Ion Collider (RHIC) at BNL, and in the Large Hadron Collider (LHC) at CERN. First, we present measurements from a large number of RHIC stores (from run-7), colliding 100 GeV/nucleon Au-197(79+) beams without stochastic cooling. These are compared with two different calculation methods. The first is a simulation based on multiparticle tracking taking into account collisions, intrabeam scattering, radiation damping, and synchrotron and betatron motion. In the second, faster, method, a system of ordinary differential equations with terms describing the corresponding effects on emittances and bunch populations is solved numerically. Results of the tracking method agree very well with the RHIC data. With the faster method, significant discrepancies are found since the losses of particles diffusing out of the rf bucket due to intrabeam scattering are not modeled accurately enough. Finally, we use both methods to make predictions of the time evolution of the future Pb-208(82+) beams in the LHC at injection and collision energy. For this machine, the two methods agree well.
C1 [Bruce, R.; Jowett, J. M.] CERN, Geneva, Switzerland.
[Blaskiewicz, M.; Fischer, W.] BNL, Upton, NY 11973 USA.
RP Bruce, R (reprint author), CERN, Geneva, Switzerland.
EM roderik.bruce@cern.ch
OI Jowett, John M./0000-0002-9492-3775
NR 46
TC 6
Z9 6
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 SEP 7
PY 2010
VL 13
IS 9
AR 091001
DI 10.1103/PhysRevSTAB.13.091001
PG 16
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 647UR
UT WOS:000281645500001
ER
PT J
AU de Jonge, MD
Holzner, C
Baines, SB
Twining, BS
Ignatyev, K
Diaz, J
Howard, DL
Legnini, D
Miceli, A
McNulty, I
Jacobsen, CJ
Vogt, S
AF de Jonge, Martin D.
Holzner, Christian
Baines, Stephen B.
Twining, Benjamin S.
Ignatyev, Konstantin
Diaz, Julia
Howard, Daryl L.
Legnini, Daniel
Miceli, Antonino
McNulty, Ian
Jacobsen, Chris J.
Vogt, Stefan
TI Quantitative 3D elemental microtomography of Cyclotella meneghiniana at
400-nm resolution
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Article
DE diatom; trace element distributions; X-ray fluorescence tomography
ID DIATOM THALASSIOSIRA-PSEUDONANA; X-RAY MICROPROBE; FLUORESCENCE DATA;
TRACE-ELEMENTS; IRON; OCEAN; ZINC; CELLS; VISUALIZATION; FRUSTULE
AB X-ray fluorescence tomography promises to map elemental distributions in unstained and unfixed biological specimens in three dimensions at high resolution and sensitivity, offering unparalleled insight in medical, biological, and environmental sciences. X-ray fluorescence tomography of biological specimens has been viewed as impractical-and perhaps even impossible for routine application- due to the large time required for scanning tomography and significant radiation dose delivered to the specimen during the imaging process. Here, we demonstrate submicron resolution X-ray fluorescence tomography of a whole unstained biological specimen, quantifying three-dimensional distributions of the elements Si, P, S, Cl, K, Ca, Mn, Fe, Cu, and Zn in the freshwater diatom Cyclotella meneghiniana with 400-nm resolution, improving the spatial resolution by over an order of magnitude. The resulting maps faithfully reproduce cellular structure revealing unexpected patterns that may elucidate the role of metals in diatom biology and of diatoms in global element cycles. With anticipated improvements in data acquisition and detector sensitivity, such measurements could become routine in the near future.
C1 [de Jonge, Martin D.; Howard, Daryl L.] Australian Synchrotron, Clayton, Vic 3168, Australia.
[Holzner, Christian; Jacobsen, Chris J.] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA.
[Baines, Stephen B.] SUNY Stony Brook, Dept Ecol & Evolut, Stony Brook, NY 11794 USA.
[Twining, Benjamin S.] Bigelow Lab Ocean Sci, W Boothbay Harbor, ME 04575 USA.
[Ignatyev, Konstantin; Legnini, Daniel; Miceli, Antonino; McNulty, Ian; Vogt, Stefan] Argonne Natl Lab, Argonne, IL 60439 USA.
[Diaz, Julia] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA.
RP de Jonge, MD (reprint author), Australian Synchrotron, 800 Blackburn Rd, Clayton, Vic 3168, Australia.
EM martin.dejonge@synchrotron.org.au
RI de Jonge, Martin/C-3400-2011; Jacobsen, Chris/E-2827-2015; Vogt,
Stefan/B-9547-2009; Vogt, Stefan/J-7937-2013;
OI Ignatyev, Konstantin/0000-0002-8937-5655; Jacobsen,
Chris/0000-0001-8562-0353; Vogt, Stefan/0000-0002-8034-5513; Vogt,
Stefan/0000-0002-8034-5513; Twining, Benjamin/0000-0002-1365-9192
FU International Synchrotron Access Program (ISAP); National Collaborative
Research Infrastructure Strategy; ARC [DP0987422]; National Institutes
of Health (NIH) [5R21EB006134-02, P41 RR-01081]; National Science
Foundation (NSF) [OCE 0527059, OCE 0913080, OCE 0527062]; U.S.
Department of Energy, Office of Science, Office of Basic Energy Sciences
[DE-AC02-06CH11357]
FX Many thanks to L. Finney for experimental support and R. Sluiter for
controls assistance. M.D.d.J. acknowledges travel funding provided by
the International Synchrotron Access Program (ISAP) managed by the
Australian Synchrotron. ISAP is funded by a National Collaborative
Research Infrastructure Strategy grant provided by the federal
government of Australia. M.D.d.J. was supported under an ARC Discovery
Project DP0987422. C.H. was supported by National Institutes of Health
(NIH) Grant 5R21EB006134-02. S.B.B. was supported by National Science
Foundation (NSF) Grants OCE 0527059 and OCE 0913080. B.S.T. was
supported by NSF Grant OCE 0527062. Use of the Advanced Photon Source
was supported by the U.S. Department of Energy, Office of Science,
Office of Basic Energy Sciences, under Contract DE-AC02-06CH11357.
Molecular graphics images were produced using the UCSF Chimera package
(35) from the Resource for Biocomputing, Visualization, and Informatics
at the University of California, San Francisco (supported by NIH Grant
P41 RR-01081). We thank the reviewers for their helpful comments.
NR 36
TC 62
Z9 65
U1 3
U2 50
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 SEP 7
PY 2010
VL 107
IS 36
BP 15676
EP 15680
DI 10.1073/pnas.1001469107
PG 5
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 647RY
UT WOS:000281637800011
PM 20720164
ER
PT J
AU Yang, SC
Blachowicz, L
Makowski, L
Roux, B
AF Yang, Sichun
Blachowicz, Lydia
Makowski, Lee
Roux, Benoit
TI Multidomain assembled states of Hck tyrosine kinase in solution
SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF
AMERICA
LA English
DT Article
DE coarse-grained model; Bayesian analysis; folding; SAXS; simulation
ID X-RAY-SCATTERING; CRYSTAL-STRUCTURE; C-SRC; STRUCTURAL-CHARACTERIZATION;
PROTEIN COMPLEXES; SH3 DOMAIN; ACTIVATION; DYNAMICS; PHOSPHORYLATION;
TRANSITION
AB An approach combining small-angle X-ray solution scattering (SAXS) data with coarse-grained (CG) simulations is developed to characterize the assembly states of Hck, a member of the Src-family kinases, under various conditions in solution. First, a basis set comprising a small number of assembly states is generated from extensive CG simulations. Second, a theoretical SAXS profile for each state in the basis set is computed by using the Fast-SAXS method. Finally, the relative population of the different assembly states is determined via a Bayesian-based Monte Carlo procedure seeking to optimize the theoretical scattering profiles against experimental SAXS data. The study establishes the concept of basis-set supported SAXS (BSS-SAXS) reconstruction combining computational and experimental techniques. Here, BSS-SAXS reconstruction is used to reveal the structural organization of Hck in solution and the different shifts in the equilibrium population of assembly states upon the binding of different signaling peptides.
C1 [Yang, Sichun; Blachowicz, Lydia; Roux, Benoit] Univ Chicago, Dept Biochem & Mol Biol, Chicago, IL 60637 USA.
[Makowski, Lee; Roux, Benoit] Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA.
RP Roux, B (reprint author), Univ Chicago, Dept Biochem & Mol Biol, 929 E 57th St, Chicago, IL 60637 USA.
EM roux@uchicago.edu
RI Yang, Sichun/B-1608-2008; ID, BioCAT/D-2459-2012
OI Yang, Sichun/0000-0002-1726-0576;
FU National Institutes of Health via National Cancer Institute [CA-093577];
Teragrid [MCA01S018]; San Diego Supercomputer Center
FX We thank Markus Seeliger and John Kuriyan for providing the pHCK3D and
YopH Duet plasmids and Richard Jones for synthesizing p2 and p3
peptides. SAXS experiments were carried out at the BioCAT of the Argonne
National Laboratory with the help of Dr. Liang Guo. We thank Alper
Dagcan for helping with SAXS experiments. This work was supported by the
National Institutes of Health via Grant CA-093577 from the National
Cancer Institute. The computations were supported by Teragrid under
project MCA01S018 and by the San Diego Supercomputer Center.
NR 32
TC 93
Z9 94
U1 1
U2 26
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 SEP 7
PY 2010
VL 107
IS 36
BP 15757
EP 15762
DI 10.1073/pnas.1004569107
PG 6
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 647RY
UT WOS:000281637800026
PM 20798061
ER
PT J
AU Nossa, CW
Oberdorf, WE
Yang, LY
Aas, JA
Paster, BJ
DeSantis, TZ
Brodie, EL
Malamud, D
Poles, MA
Pei, ZH
AF Nossa, Carlos W.
Oberdorf, William E.
Yang, Liying
Aas, Jorn A.
Paster, Bruce J.
DeSantis, Todd Z.
Brodie, Eoin L.
Malamud, Daniel
Poles, Michael A.
Pei, Zhiheng
TI Design of 16S rRNA gene primers for 454 pyrosequencing of the human
foregut microbiome
SO WORLD JOURNAL OF GASTROENTEROLOGY
LA English
DT Article
DE Foregut; Microbiome; 16S; 454 sequencing; Primer
ID DISTAL ESOPHAGUS; BACTERIAL BIOTA; DNA; DIVERSITY; SEQUENCES;
AMPLIFICATION
AB AIM: To design and validate broad-range 16S rRNA primers for use in high throughput sequencing to classify bacteria isolated from the human foregut microbiome.
METHODS: A foregut microbiome dataset was constructed using 16S rRNA gene sequences obtained from oral, esophageal, and gastric microbiomes produced by Sanger sequencing in previous studies represented by 219 bacterial species. Candidate primers evaluated were from the European rRNA database. To assess the effect of sequence length on accuracy of classification, 16S rRNA genes of various lengths were created by trimming the full length sequences. Sequences spanning various hypervariable regions were selected to simulate the amplicons that would be obtained using possible primer pairs. The sequences were compared with full length 16S rRNA genes for accuracy in taxonomic classification using online software at the Ribosomal Database Project (RDP). The universality of the primer set was evaluated using the RDP 16S rRNA database which is comprised of 433306 16S rRNA genes, represented by 36 phyla.
RESULTS: Truncation to 100 nucleotides (nt) downstream from the position corresponding to base 28 in the Escherichia coli 165 rRNA gene caused misclassification of 87 (39.7%) of the 219 sequences, compared with misclassification of only 29 (13.2%) sequences with truncation to 350 nt. Among 350-nt sequence reads within various regions of the 165 rRNA gene, the reverse read of an amplicon generated using the 343F/798R primers had the least (8.2%) effect on classification. In comparison, truncation to 900 nt mimicking single pass Sanger reads misclassified 5.0% of the 219 sequences. The 343F/798R amplicon accurately assigned 91.8% of the 219 sequences at the species level. Weighted by abundance of the species in the esophageal dataset, the 343F/798R amplicon yielded similar classification accuracy without a significant loss in species coverage (92%). Modification of the 343F/798R primers to 347F/803R increased their universality among foregut species. Assuming that a typical polymerase chain reaction can tolerate 2 mismatches between a primer and a template, the modified 347F and 803R primers should be able to anneal 98% and 99.6% of all 16S rRNA genes in the RDP database.
CONCLUSION: 347F/803R is the most suitable pair of primers for classification of foregut 16S rRNA genes but also possess universality suitable for analyses of other complex microbionnes. (C) 2010 Baishideng. All rights reserved.
C1 [Pei, Zhiheng] Dept Vet Affairs New York Harbor Hlth Syst, New York, NY 10010 USA.
[Nossa, Carlos W.; Oberdorf, William E.; Poles, Michael A.] NYU, Sch Med, Dept Med, New York, NY 10016 USA.
[Yang, Liying] NYU, Dept Pathol, Sch Med, New York, NY 10016 USA.
[Aas, Jorn A.; Paster, Bruce J.] Forsyth Inst, Dept Mol Genet, Boston, MA 02115 USA.
[Aas, Jorn A.] Univ Oslo, Fac Dent, N-0316 Oslo, Norway.
[Paster, Bruce J.] Harvard Univ, Sch Dent Med, Boston, MA 02115 USA.
[DeSantis, Todd Z.; Brodie, Eoin L.] Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Environm Biotechnol, Berkeley, CA 94720 USA.
[Malamud, Daniel] NYU, Coll Dent, New York, NY 10016 USA.
[Pei, Zhiheng] NYU, Dept Pathol & Med, Sch Med, New York, NY 10016 USA.
RP Pei, ZH (reprint author), Dept Vet Affairs New York Harbor Hlth Syst, 423 E 23rd St, New York, NY 10010 USA.
EM zhiheng.pei@nyumc.org
RI Brodie, Eoin/A-7853-2008;
OI Brodie, Eoin/0000-0002-8453-8435; Malamud, Daniel/0000-0002-9094-4122
FU NIH Roadmap Initiative [UH2CA140233]; National Cancer Institute
[UH2CA140233]; National Institute of Allergy and Infectious Diseases
[R01AI063477]; National Institute of Dental and Craniofacial Research
[DE-11443, U19DE018385]
FX Supported by (in part) Grants UH2CA140233 from the Human Microbiome
Project of the NIH Roadmap Initiative and National Cancer Institute;
R01AI063477 from the National Institute of Allergy and Infectious
Diseases; DE-11443 from the National Institute of Dental and
Craniofacial Research; and U19DE018385 from the National Institute of
Dental & Craniofacial Research
NR 32
TC 102
Z9 104
U1 1
U2 44
PU BAISHIDENG PUBLISHING GROUP INC
PI PLEASANTON
PA 8226 REGENCY DR, PLEASANTON, CA 94588 USA
SN 1007-9327
EI 2219-2840
J9 WORLD J GASTROENTERO
JI World J. Gastroenterol.
PD SEP 7
PY 2010
VL 16
IS 33
BP 4135
EP 4144
DI 10.3748/wjg.v16.i33.4135
PG 10
WC Gastroenterology & Hepatology
SC Gastroenterology & Hepatology
GA 647PH
UT WOS:000281630300004
PM 20806429
ER
PT J
AU Bennett, DA
Horansky, RD
Hoover, AS
Hoteling, NJ
Rabin, MW
Schmidt, DR
Swetz, DS
Vale, LR
Ullom, JN
AF Bennett, D. A.
Horansky, R. D.
Hoover, A. S.
Hoteling, N. J.
Rabin, M. W.
Schmidt, D. R.
Swetz, D. S.
Vale, L. R.
Ullom, J. N.
TI An analytical model for pulse shape and electrothermal stability in
two-body transition-edge sensor microcalorimeters
SO APPLIED PHYSICS LETTERS
LA English
DT Article
AB High-resolution superconducting gamma-ray sensors show potential for the more accurate analysis of nuclear material. These devices are part of a larger class of microcalorimeters and bolometers based on transition edge sensors (TESs) that have two distinct thermal bodies. We derive the time domain behavior of the current and temperature for compound TES devices in the small signal limit and demonstrate the utility of these equations for device design and characterization. In particular, we use the model to fit pulses from our gamma-ray microcalorimeters and demonstrate how critical damping and electrothermal stability can be predicted. [doi :10.1063/1.3486477]
C1 [Bennett, D. A.; Horansky, R. D.; Schmidt, D. R.; Swetz, D. S.; Vale, L. R.; Ullom, J. N.] Natl Inst Stand & Technol, Boulder, CO 80305 USA.
[Hoover, A. S.; Hoteling, N. J.; Rabin, M. W.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Bennett, DA (reprint author), Natl Inst Stand & Technol, Boulder, CO 80305 USA.
EM douglas.bennett@nist.gov
RI Bennett, Douglas/B-8001-2012
OI Bennett, Douglas/0000-0003-3011-3690
FU U.S. Department of Energy through the Office of Nonproliferation
Research and Verification
FX We gratefully acknowledge the support of the U.S. Department of Energy
through the Office of Nonproliferation Research and Verification.
NR 8
TC 8
Z9 8
U1 0
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 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD SEP 6
PY 2010
VL 97
IS 10
AR 102504
DI 10.1063/1.3486477
PG 3
WC Physics, Applied
SC Physics
GA 658GP
UT WOS:000282478800026
ER
PT J
AU Yu, KM
Novikov, SV
Broesler, R
Liliental-Weber, Z
Levander, AX
Kao, VM
Dubon, OD
Wu, J
Walukiewicz, W
Foxon, CT
AF Yu, K. M.
Novikov, S. V.
Broesler, R.
Liliental-Weber, Z.
Levander, A. X.
Kao, V. M.
Dubon, O. D.
Wu, J.
Walukiewicz, W.
Foxon, C. T.
TI Low gap amorphous GaN1-xAsx alloys grown on glass substrate
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID MOLECULAR-BEAM EPITAXY; BAND; LAYERS; ENERGY
AB Amorphous GaN1-xAsx layers with As content in the range of x=0.1 to 0.6 were grown by molecular beam epitaxy on Pyrex glass substrate. These alloys exhibit a wide range of band gap values from 2.2 to 1.3 eV. We found that the density of the amorphous films is similar to 0.8-0.85 of their corresponding crystalline value. These amorphous films have smooth morphology, homogeneous composition, and sharp well defined optical absorption edges. The measured band gap values for the crystalline and amorphous GaN1-xAsx alloys are in excellent agreement with the predictions of the band anticrossing model. The high absorption coefficient of similar to 10(5) cm(-1) for the amorphous GaN1-xAsx films suggests that relatively thin films (on the order of I,am) are necessary for photovoltaic application. (C) 2010 American Institute of Physics. [doi:10.1063/1.3488826]
C1 [Yu, K. M.; Broesler, R.; Liliental-Weber, Z.; Levander, A. X.; Kao, V. M.; Dubon, O. D.; Wu, J.; Walukiewicz, W.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA.
[Novikov, S. V.; Foxon, C. T.] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England.
[Broesler, R.; Levander, A. X.; Dubon, O. D.; Wu, J.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
RP Yu, KM (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
EM kmyu@lbl.gov
RI Wu, Junqiao/G-7840-2011; Liliental-Weber, Zuzanna/H-8006-2012; Yu, Kin
Man/J-1399-2012
OI Wu, Junqiao/0000-0002-1498-0148; Yu, Kin Man/0000-0003-1350-9642
FU Office of Science, Office of Basic Energy Sciences, Materials Sciences
and Engineering Division, of the U.S. Department of Energy
[DE-AC02-05CH11231]; EPSRC [EP/G046867/1, EP/G030634/1, EP/I004203/1]
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 under Contract No. DE-AC02-05CH11231. The
work at the University of Nottingham was undertaken with support from
the EPSRC (Grant Nos. EP/G046867/1, EP/G030634/1, and EP/I004203/1).
NR 13
TC 11
Z9 11
U1 0
U2 3
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 SEP 6
PY 2010
VL 97
IS 10
AR 101906
DI 10.1063/1.3488826
PG 3
WC Physics, Applied
SC Physics
GA 658GP
UT WOS:000282478800017
ER
PT J
AU Li, J
Kathmann, SM
Hu, HS
Schenter, GK
Autrey, T
Gutowski, M
AF Li, Jun
Kathmann, Shawn M.
Hu, Han-Shi
Schenter, Gregory K.
Autrey, Tom
Gutowski, Maciej
TI Theoretical Investigations on the Formation and Dehydrogenation Reaction
Pathways of H(NH2BH2)(n)H (n=1-4) Oligomers: Importance of Dihydrogen
Interactions
SO INORGANIC CHEMISTRY
LA English
DT Article
ID GENERALIZED GRADIENT APPROXIMATION; CHEMICAL HYDROGEN STORAGE;
AMMONIA-BORANE DEHYDROGENATION; INTRINSIC REACTION COORDINATE;
DENSITY-FUNCTIONAL THEORY; N-H COMPOUNDS; THERMAL-DECOMPOSITION;
AB-INITIO; ELECTRONIC-STRUCTURE; MOLECULAR-DYNAMICS
AB The H(NH2BH2)(n)H oligomers are possible products from dehydrogenation of ammonia borane (NH3BH3) and ammonium borohydride (NH4BH4), which belong to a class of boron-nitrogen-hydrogen (BNHx) compounds that are promising materials for chemical hydrogen storage. Understanding the kinetics and reaction pathways of formation of these oligomers and their further dehydrogenation is essential for developing BNHx-based hydrogen storage materials. We have performed computational modeling using density functional theory (DFT), ab initio wave function theory, and Car-Parrinello molecular dynamics (CPMD) simulations on the energetics and formation pathways for the H(NH2BH2)(n)H (n = 1-4) oligomers, polyaminoborane (PAB), from NH3BH3 monomers and the subsequent dehydrogenation steps to form polyiminoborane (PIB). Through computational transition state searches and evaluation of the intrinsic reaction coordinates, we have investigated the B-N bond cleavage, the reactions of NH3BH3 molecule with intermediates, dihydrogen release through infra- and intermolecular hydrogen transfer, dehydrocoupling/cyclization of the oligomers, and the dimerization of NH3BH3 molecules. We find that the formation of H(NH2BH2)(n+1)H oligomers occurs first through reactions of the H(NH2BH2)(n)H oligomers with BH3 followed by reactions with NH3 and the release of H-2, where the BH3 and NH3 intermediates are formed through dissociation of NH3BH3. We also find that the dimerization of the NH3BH3 molecules to form cyclic c-(NH2BH2)(2) is slightly exothermic, with an unexpected transition state that leads to the simultaneous release of two H-2 molecules. The dehydrogenations of the oligomers are also exothermic, typically by less than 10 kcal/(mol of H-2), with the largest exothermicity for n = 3. The transition state search shows that the one-step direct dehydrocoupling cyclization of the oligomers is not a favored pathway because of high activation barriers. The dihydrogen bonding, in which protic (H-N) hydrogens interact with hydridic (H-B) hydrogens, plays a vital role in stabilizing different structures of the reactants, transition states, and products. The dihydrogen interaction (DHI) within the R-BH2(eta(2)-H-2) moiety accounts for both the formation mechanisms of the oligomers and for the dehydrogenation of ammonia borane.
C1 [Li, Jun; Hu, Han-Shi] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China.
[Li, Jun; Kathmann, Shawn M.; Schenter, Gregory K.; Autrey, Tom; Gutowski, Maciej] Pacific NW Natl Lab, WR Wiley Environm Mol Sci Lab, Richland, WA 99352 USA.
[Li, Jun; Kathmann, Shawn M.; Schenter, Gregory K.; Autrey, Tom; Gutowski, Maciej] Pacific NW Natl Lab, Chem & Mat Sci Div, Richland, WA 99352 USA.
[Gutowski, Maciej] Heriot Watt Univ, Chem Sch Engn & Phys Sci, Edinburgh EH14 4AS, Midlothian, Scotland.
RP Li, J (reprint author), Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China.
EM junli.thu@gmail.com
RI Li, Jun/E-5334-2011; Schenter, Gregory/I-7655-2014
OI Li, Jun/0000-0002-8456-3980; Schenter, Gregory/0000-0001-5444-5484
FU U.S. Department of Energy, Office of Basic Energy Sciences, Chemical
Sciences Division; DOE EERE Chemical Hydrogen Storage Center of
Excellence; NKBRSF [2006CB932300, 2007CB815203]; European Community
[MIRG-CT-2007-046477]; U.S. Department of Energy's Office of Biological
and Environmental Research at the Pacific Northwest National Laboratory
FX We are grateful to Drs. John Linehan and Don Camaioni for helpful
discussions. S.K. and G.S. acknowledge support from the U.S. Department
of Energy, Office of Basic Energy Sciences, Chemical Sciences Division.
J.L. and T.A. acknowledge support from DOE EERE Chemical Hydrogen
Storage Center of Excellence. J.L. is also supported by NKBRSF
(2006CB932300, 2007CB815203) and M.G. was supported by a Marie Curie
project MIRG-CT-2007-046477 within the 6th European Community Framework
Programme. This research was performed in part using the Molecular
Science Computing Facility in the William R. Wiley Environmental
Molecular Sciences Laboratory, a national scientific user facility
sponsored by the U.S. Department of Energy's Office of Biological and
Environmental Research and located at the Pacific Northwest National
Laboratory. Pacific Northwest National Laboratory is operated for the
Department of Energy by Battelle.
NR 70
TC 20
Z9 20
U1 2
U2 47
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0020-1669
J9 INORG CHEM
JI Inorg. Chem.
PD SEP 6
PY 2010
VL 49
IS 17
BP 7710
EP 7720
DI 10.1021/ic100418a
PG 11
WC Chemistry, Inorganic & Nuclear
SC Chemistry
GA 642QT
UT WOS:000281231800022
PM 20701247
ER
PT J
AU Nyman, M
Rodriguez, MA
Campana, CF
AF Nyman, May
Rodriguez, Mark A.
Campana, Charles F.
TI Self-Assembly of Alkali-Uranyl-Peroxide Clusters
SO INORGANIC CHEMISTRY
LA English
DT Article
ID BOND-VALENCE PARAMETERS; CRYSTAL-CHEMISTRY; FULLERENE TOPOLOGIES;
ELECTRON-TRANSFER; CATION SIZE; ION-PAIRS; COORDINATION; POLYHEDRA;
URANIUM; ENERGY
AB The hexavalent uranium specie, uranyl triperoxide, UO(2)(O(2))(3)(4-), has been shown recently to behave like high oxidation-state d(0) transition-metals, self-assembling into polyoxometalate-like clusters that contain up to 60 uranyl cations bridged by peroxide ligands. There has been much less focus on synthesis and structural characterization of salts of the monomeric UO(2)(O(2))(3)(4-) building block of these clusters. However, these could serve as water-soluble uranyl precursors for both clusters and materials, and also be used as simple models to study aqueous behavior by experiment and modeling. The countercation is of utmost importance to the assembly of these clusters, and Li(+) has proven useful for the crystallization of many of the known cluster geometries to date. We present in this paper synthesis and structural characterization of two monomeric lithium uranyl-peroxide salts, Li(4)[UO(2)(O(2))(3)] center dot 10H(2)O (1) and [UO(2)(O(2))(3)](12)[(UO(2)(OH)(4))Li(16)(H(2)O)(28)](3) center dot Li(6)[H(2)O](26) (2). They were obtained from aqueous-alcohol solutions rather than the analogous aqueous solutions from which lithium uranyl-peroxide clusters are crystallized. Rapid introduction of the alcohol gives the structure of (1) whereas slow diffusion of alcohol results in crystallization of (2). (2) is an unusual structure featuring uranyl-centered alkali clusters that are linked into ring and spherical arrangements via [UO(2)(O(2))(3)] anions. Furthermore, partial substitution of Rb or Cs into the synthesis results in formation of (2) with substitution of these larger alkalis into the uranyl-centered clusters. We surmise that the slow crystallization allows for direct bonding of alkali metals to the uranyl-peroxide oxygen ligands that is observed in (2), and its Rb and Cs-substituted derivatives. In contrast, the only interaction between UO(2)(O(2))(3)(4-) and Li(+) observed in (1) is through hydrogen bonding of the lithium-bound water. These structures potentially provide some insight to understanding how alkali counterions interact with the UO(2)(O(2))(3)(4-) anions during the self-assembly, crystallization and even redissolution of uranyl-peroxide polyanionic clusters.
C1 [Nyman, May; Rodriguez, Mark A.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Campana, Charles F.] Bruker AXS Inc, Madison, WI 53711 USA.
RP Nyman, M (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
EM mdnyman@sandia.gov
OI Campana, Charles/0000-0002-0495-0922
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-SC0001089]; United States Department of Energy
[DE-AC04-94AL85000]
FX This material is based upon work supported as part of the Materials
Science of Actinides, 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-SC0001089. Sandia is a multiprogram
laboratory operated by Sandia Corporation, a Lockheed-Martin Company,
for the United States Department of Energy under Contract No.
DE-AC04-94AL85000.
NR 28
TC 19
Z9 19
U1 5
U2 32
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0020-1669
J9 INORG CHEM
JI Inorg. Chem.
PD SEP 6
PY 2010
VL 49
IS 17
BP 7748
EP 7755
DI 10.1021/ic1005192
PG 8
WC Chemistry, Inorganic & Nuclear
SC Chemistry
GA 642QT
UT WOS:000281231800027
PM 20701308
ER
PT J
AU Cohen, BW
Polyansky, DE
Zong, RF
Zhou, H
Ouk, T
Cabelli, DE
Thummel, RP
Fujita, E
AF Cohen, Brian W.
Polyansky, Dmitry E.
Zong, Ruifa
Zhou, Hui
Ouk, Theany
Cabelli, Diane E.
Thummel, Randolph P.
Fujita, Etsuko
TI Differences of pH-Dependent Mechanisms on Generation of Hydride Donors
using Ru(II) Complexes Containing Geometric Isomers of NAD(+) Model
Ligands: NMR and Radiolysis Studies in Aqueous Solution
SO INORGANIC CHEMISTRY
LA English
DT Article
ID BOND-DISSOCIATION ENERGIES; ELECTRON-REDUCED FORMS; NADH ANALOGS;
RUTHENIUM(II) COMPLEXES; PYRIDINYL RADICALS; EXCITED-STATES; ACID-BASE;
ONE-STEP; ELECTROCHEMICAL REDUCTION; 2-ELECTRON REDUCTION
AB The pH-dependent mechanism of the reduction of the nicotinamide adenine dinucleotide (NADH) model complex [Ru(bpy)(2)(5)](2+) (5 = 3-(pyrid-2'-yl)-4-azaacridine) was compared to the mechanism of the previously studied geometric isomer [Ru(bpy)(2)(pbn)](2+) (pbn = 2-(pyrid-2'-yl)-1-azaacridine, previously referred to as 2-(pyrid-2'-yl)benzo[b]-1,5-naphthyridine) in aqueous media. The exposure of [Ru(bpy)(2)(5)](2+) to CO2 center dot- leads to the formation of the one-electron reduced species (k = 4.4 x 10(9) M-1 s(-1)). At pH < 11.2, the one-electron reduced species can be protonated, k= 2.6 x 10(4) s(-1) in D2O. Formation of a C-C bonded dimer is observed across the pH range of 5-13 (k = 4.5 X 10(8) M-1 S-1). At pH < 11, two protonated radical species react to form a stable C-C bonded dimer. At pH > 11, dimerization of two one-electron reduced species is followed by disproportionation to one equivalent starting complex [Ru(bpy)(2)(5)](2+) and one equivalent [Ru(bpy)(2)(5HH)](2+). The structural difference between [Ru(bpy)(2)(pbn)](2+) and [Ru(bpy)(2)(5)](2+) dictates the mechanism and product formation in aqueous medium. The exchange of the nitrogen and carbon atoms on the azaacridine ligands alters the accessibility of the dimerization reactive site, thereby changing the mechanism and the product formation for the reduction of the [Ru(bpy)(2)(5)](2+) compound.
C1 [Cohen, Brian W.; Polyansky, Dmitry E.; Cabelli, Diane E.; Fujita, Etsuko] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
[Zong, Ruifa; Zhou, Hui; Ouk, Theany; Thummel, Randolph P.] Univ Houston, Dept Chem, Houston, TX 77204 USA.
RP Cabelli, DE (reprint author), Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA.
EM cabelli@bnl.gov; thummel@uh.edu; fujita@bnl.gov
RI Fujita, Etsuko/D-8814-2013; Polyansky, Dmitry/C-1993-2009
OI Polyansky, Dmitry/0000-0002-0824-2296
FU University of Houston [DE-FG03-02ER15334]; BNL [DE-AC02-98CH10886]; U.S.
Department of Energy; Division of Chemical Sciences, Geosciences, and
Biosciences, Office of Basic Energy Sciences; U.S. Department of Energy
for funding under the BES Solar Energy Utilization Initiative
FX Work performed at BNL and University of Houston is funded under contract
DE-AC02-98CH10886 and contract no. DE-FG03-02ER15334, respectively, with
the U.S. Department of Energy and is supported by its Division of
Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy
Sciences. E.F. and D.E.C. also thank the U.S. Department of Energy for
funding under the BES Solar Energy Utilization Initiative. R.P.T. thanks
the Robert A. Welch Foundation (E-621).
NR 73
TC 23
Z9 23
U1 3
U2 15
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0020-1669
J9 INORG CHEM
JI Inorg. Chem.
PD SEP 6
PY 2010
VL 49
IS 17
BP 8034
EP 8044
DI 10.1021/ic101098v
PG 11
WC Chemistry, Inorganic & Nuclear
SC Chemistry
GA 642QT
UT WOS:000281231800059
PM 20687532
ER
PT J
AU Zhang, GP
Qin, ZJ
AF Zhang, G. P.
Qin, Z. J.
TI Crossover of the conductivity of zigzag graphene nanoribbon connected by
normal metal contacts
SO PHYSICS LETTERS A
LA English
DT Article
ID LOCALIZATION; TRANSPORT; GAS
AB The transport property of zigzag graphene nanoribbon (ZGNR) connected by two normal metal contacts is investigated by Landauer-Buttiker formula combined with transfer matrix method. In addition to evenodd parity, we found that the conductivity is completely determined by the width-to-length ratio. For certain wide ZGNR with even number carbon atoms in the width direction, the conductivity dependence on the length changes from linearly to inversely, when the length approaches the thermodynamic limit, as the transport property is quite different for different aspect of ZGNR. (C) 2010 Elsevier By. All rights reserved.
C1 [Zhang, G. P.] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.
[Zhang, G. P.] US DOE, Ames Lab, Ames, IA 50011 USA.
[Zhang, G. P.] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA.
[Qin, Z. J.] Zhengzhou Univ, Sch Phys & Engn, Zhengzhou 450001, Peoples R China.
RP Zhang, GP (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.
EM zhanggp96@ruc.edu.cn
RI Zhang, Guiping/F-4390-2011; 石, 源/D-5929-2012; ruc, phy/E-4170-2012
OI Zhang, Guiping/0000-0001-8697-5711;
FU NFSC grants (China) [10425417, 10674142]; US Department of Energy, Basic
Energy Sciences; National Energy Research Supercomputing Centre (NERSC)
in Berkeley [DE-ACO2-07CH11358]
FX G.P. Zhang would like to thank Prof. Wang X.Q. for proposing this
interesting issue, and thank Pre. Lu Z.Y. for many pronounced
discussion. G.P. Zhang also thank Dr. Hu S.J. for discussing the effect
of the structure of quantum wire on the transport property. This work
was supported by the NFSC grants (China) under the numbers 10425417 and
10674142. Work at Ames Laboratory was supported by the US Department of
Energy, Basic Energy Sciences, including a grant of computer time at the
National Energy Research Supercomputing Centre (NERSC) in Berkeley,
under Contract No. DE-ACO2-07CH11358.
NR 15
TC 14
Z9 14
U1 0
U2 6
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0375-9601
J9 PHYS LETT A
JI Phys. Lett. A
PD SEP 6
PY 2010
VL 374
IS 40
BP 4140
EP 4143
DI 10.1016/j.physleta.2010.08.018
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 653EF
UT WOS:000282070100012
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-Galtieriai, A
Barnes, VE
Barnett, BA
Barria, P
Bartos, R
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
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Buzatu, A
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Calancha, C
Camarda, S
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Campbell, M
Canelli, F
Canepa, A
Carls, B
Carlsmith, D
Carosi, R
Carrillo, S
Carron, S
Casal, B
Casarsa, M
Castro, A
Catastini, P
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Cavalli-Sforza, M
Cerri, A
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Chang, SH
Chen, YC
Chertok, M
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Chlebana, F
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Chwalek, T
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Ciocci, MA
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Culbertson, R
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Davies, T
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Di Canto, A
Di Ruzza, B
Dittmann, JR
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Feindt, M
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Field, R
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Frank, MJ
Franklin, M
Freeman, JC
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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
Cold, 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
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Harr, RF
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Husemann, U
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Huston, J
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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
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Ketchum, W
Keung, J
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Kilminster, B
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Kim, HS
Kim, HW
Kim, JE
Kim, MJ
Kim, SB
Kim, SH
Kim, YK
Kimura, N
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Klimenko, S
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Kong, DJ
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Kwang, S
Laasanen, AT
Lami, S
Lammel, S
Lancaster, M
Lander, RL
Lannon, K
Lath, A
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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
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Madrak, R
Maeshima, K
Makhoul, K
Maksimovic, P
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Manca, G
Manousakis-Katsikakis, A
Margaroli, F
Marino, C
Marino, CP
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Martin, V
Martinez, M
Martinez-Ballarin, R
Mastrandrea, P
Mathis, M
Mattson, ME
Mazzanti, P
McFarland, KS
McIntyre, R
McNulty, R
Mehta, A
Mehtala, P
Menzione, A
Mesropian, C
Miao, T
Mietlicki, D
Miladinovic, N
Miller, R
Mills, C
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Mondragon, MN
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Mukherjee, A
Muller, T
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Neubauer, MS
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Aa, ON
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Oh, YD
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Papaikonomou, A
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Pashapour, S
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Pauletta, G
Paulini, M
Paus, C
Peiffer, T
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Piacentino, G
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Tkaczyk, S
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Uozumi, S
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Varganov, A
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Vazquez, F
Velev, G
Vellidis, C
Vidal, M
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TI Measurement of d sigma/dy of Drell-Yan e(+)e(-) pairs in the Z mass
region from p(p)over-bar collisions at root s=1.96 TeV
SO PHYSICS LETTERS B
LA English
DT Article
DE Z boson; Rapidity d sigma/dy; PDFs
ID SILICON VERTEX DETECTOR; PARTON DISTRIBUTIONS; HADRON COLLISIONS; LHC;
ENERGIES
AB We report on a CDF measurement of the total cross section and rapidity distribution, d sigma/dy, for gamma*/Z -> e(+)e(-) events in the Z boson mass region (66 < M-ee < 116 GeV/c(2)) produced in p (p) over bar collisions at root s = 1.96 TeV with 2.1 fb(-1) of integrated luminosity. The measured cross section of 257 +/- 16 pb and d sigma/dy distribution are compared with Next-to-Leading-Order (NLO) and Next-to-Next-to-Leading-Order (NNLO) QCD theory predictions with CTEQ and MRST/MSTW parton distribution functions (PDFs). There is good agreement between the experimental total cross section and d sigma/dy measurements with theoretical calculations with the most recent NNLO PDFs. (C) 2010 Elsevier B.V. All rights reserved.
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[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-Galtieriai, A.; Cerri, A.; Deisher, A.; Fang, H. C.; Haber, C.; Hsu, S. -C.; Lin, C. -J.; Lujan, P.; Lys, J.; Muelmenstaedt, J.; Niesenai, 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. U.] UCL, London WC1E 6BT, England.
[Calancha, C.; Fernandez, J. P.; Gonzalez, O.; Martinez-Ballarin, R.; Redondo, I.; Ttito-Guzmanam, P.; Vidal, M.] Ctr Invest Energet Medioambientales & 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.; 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, ITEP, Moscow 117259, Russia.
[Cold, 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. J.; Renton, P.] Univ Oxford, Oxford OX1 3RH, England.
[Compostella, G.; Dorigo, T.; Scribano, A.] Ist Nazl Fis Nucl, Sez Padova Trento, Trento, 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.; Saveiiev, V.; Savoy-Navarro, A.] Univ Paris 06, IN2P3 CNRS, UMR 7585, LPNHE, 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.
[Bedeschi, F.; Carosi, R.; Chiarelli, G.; Di Ruzza, B.; Giannetti, P.; Giunta, M.; Introzzi, G.; Lami, S.; Leone, S.; Menzione, A.; Piacentino, G.; Ristori, L.; Sartori, L.; Scuri, F.] Ist Nazl Fis Nucl, Pisa, Italy.
[Bellettini, G.; Crescioli, F.; Dell'Orso, M.; Di Canto, A.; Donati, S.; Punzi, G.; Sforza, F.; Volpi, G.] Univ Pisa, I-56100 Pisa, Italy.
[Barria, P.; Catastini, P.; Cavaliere, V.; Ciocci, M. A.; Garosi, P.; Latino, G.; Squillacioti, P.; Turini, N.] Univ Siena, I-53100 Siena, 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.
[Bhatti, A.; Demortier, L.; Gallinaro, M.; Goulianos, K.; Lungu, G.; Mesropian, C.] Rockefeller Univ, New York, NY 10021 USA.
[De Cecco, S.; Mastrandrea, P.; Rescigno, M.] Ist Nazl Fis Nucl, Sez Roma 1, Rome, Italy.
[Giagu, S.; Lori, M.] Sapienza Univ Roma, 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, R.; Safonov, A.; Toback, D.; Weinberger, M.] Texas A&M Univ, College Stn, TX 77843 USA.
[Cauz, D.; Pagliarone, C.; Penzo, A.; Rossi, M.; Zanetti, A.] Ist Nazl Fis Nucl, I-34100 Trieste, Italy.
[Giordani, M.; Pauletta, G.; Santi, L.; Totaro, R.] Univ Trieste Udine, I-33100 Udine, Italy.
[Hara, K.; Kim, S. H.; Kurata, M.; Miyake, H.; Morello, M. J.; 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, R.] Yale Univ, New Haven, CT 06520 USA.
RP Bodek, A (reprint author), Univ Rochester, 601 Elmwood Ave, Rochester, NY 14627 USA.
EM bodek@pas.rochester.edu
RI Muelmenstaedt, Johannes/K-2432-2015; Introzzi, Gianluca/K-2497-2015;
Piacentino, Giovanni/K-3269-2015; Martinez Ballarin,
Roberto/K-9209-2015; Gorelov, Igor/J-9010-2015; Prokoshin,
Fedor/E-2795-2012; Canelli, Florencia/O-9693-2016; Lysak,
Roman/H-2995-2014; 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; Lazzizzera, Ignazio/E-9678-2015; 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; Punzi, Giovanni/J-4947-2012; Zeng, Yu/C-1438-2013;
Annovi, Alberto/G-6028-2012; Ivanov, Andrew/A-7982-2013; Hill,
Christopher/B-5371-2012; Ruiz, Alberto/E-4473-2011; Robson,
Aidan/G-1087-2011; De Cecco, Sandro/B-1016-2012; St.Denis,
Richard/C-8997-2012; manca, giulia/I-9264-2012; Amerio,
Silvia/J-4605-2012; Warburton, Andreas/N-8028-2013; Kim,
Soo-Bong/B-7061-2014
OI Muelmenstaedt, Johannes/0000-0003-1105-6678; Introzzi,
Gianluca/0000-0002-1314-2580; Piacentino, Giovanni/0000-0001-9884-2924;
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;
Lazzizzera, Ignazio/0000-0001-5092-7531; ciocci, maria agnese
/0000-0003-0002-5462; Chiarelli, Giorgio/0000-0001-9851-4816; Punzi,
Giovanni/0000-0002-8346-9052; Annovi, Alberto/0000-0002-4649-4398;
Ivanov, Andrew/0000-0002-9270-5643; Hill,
Christopher/0000-0003-0059-0779; Ruiz, Alberto/0000-0002-3639-0368;
Warburton, Andreas/0000-0002-2298-7315;
FU US Department of 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; 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, Spain; Slovak RD
Agency; Academy of Finland; World Class University
FX We thank the Fermilab staff and the technical staffs of the
participating institutions for their vital contributions. This work was
supported by the US Department of Energy and 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. We also thank Robert Thorne for valuable
discussions.
NR 24
TC 44
Z9 44
U1 2
U2 19
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 SEP 6
PY 2010
VL 692
IS 4
BP 232
EP 239
DI 10.1016/j.physletb.2010.06.043
PG 8
WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 655KR
UT WOS:000282249400003
ER
PT J
AU Qian, XH
Johnson, DK
Himmel, ME
Nimlos, MR
AF Qian, Xianghong
Johnson, David K.
Himmel, Michael E.
Nimlos, Mark R.
TI The role of hydrogen-bonding interactions in acidic sugar reaction
pathways
SO CARBOHYDRATE RESEARCH
LA English
DT Article
DE Glucose; Xylose; Reaction pathways; Water effect
ID HIGH-TEMPERATURE; MOLECULAR-DYNAMICS; LIGNOCELLULOSIC BIOMASS;
ENZYMATIC-HYDROLYSIS; DENSITY FUNCTIONALS; D-XYLOSE; WATER; ALDOSES;
KETOSES; AUTOHYDROLYSIS
AB Previously, theoretical multiple sugar (beta-D-xylose and beta-D-glucose) reaction pathways were discovered that depended on the initial protonation site on the sugar molecules using Car-Parrinello-based molecular dynamics (CPMD) simulations [Qian, X. H.; Nimlos, M. R.; Davis, M.; Johnson, D. K.; Himmel, M. E. Carbohydr. Res. 2005, 340, 2319-2327]. In addition, simulation results showed that water molecules could participate in the sugar reactions, thus altering the reaction pathways. In the present study, the temperature and water density effects on the sugar degradation pathways were investigated with CPMD. We found that changes in both temperature and water density could profoundly affect the mechanisms and pathways. We attributed these effects to both the strength of hydrogen bonding and proton affinity of water. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Qian, Xianghong] Colorado State Univ, Dept Mech Engn, Ft Collins, CO 80523 USA.
[Johnson, David K.; Himmel, Michael E.] Natl Renewable Energy Lab, Chem & Biosci Ctr, Golden, CO 80401 USA.
[Nimlos, Mark R.] Natl Renewable Energy Lab, Natl Bioenergy Ctr, Golden, CO 80401 USA.
RP Qian, XH (reprint author), Colorado State Univ, Dept Mech Engn, Ft Collins, CO 80523 USA.
EM xhqian@engr.colostate.edu
RI Johnson, David/G-4959-2011; Qian, Xianghong/C-4821-2014
OI Johnson, David/0000-0003-4815-8782;
FU DOE [ACO-4-33101-01, ZCO-7-77386-01]; NSF [CBET 0844882]
FX The authors acknowledge helpful discussions with Melvin Tucker from the
National Bioenergy Center at the National Renewable Energy Laboratory in
Golden, CO. This work was carried out at the San Diego Supercomputing
Center and the Computational Science Center at NREL. This work was
funded from the DOE Office of the Biomass Program via subcontracts (Nos.
ACO-4-33101-01 and ZCO-7-77386-01) and NSF CAREER Award (CBET 0844882).
NR 26
TC 19
Z9 19
U1 2
U2 27
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0008-6215
J9 CARBOHYD RES
JI Carbohydr. Res.
PD SEP 3
PY 2010
VL 345
IS 13
BP 1945
EP 1951
DI 10.1016/j.carres.2010.07.008
PG 7
WC Biochemistry & Molecular Biology; Chemistry, Applied; Chemistry, Organic
SC Biochemistry & Molecular Biology; Chemistry
GA 652IV
UT WOS:000281998300019
PM 20667524
ER
PT J
AU Kalashnikova, I
Barone, MF
AF Kalashnikova, I.
Barone, M. F.
TI On the stability and convergence of a Galerkin reduced order model (ROM)
of compressible flow with solid wall and far-field boundary treatment
SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
LA English
DT Article
DE reduced order model (ROM); proper orthogonal decomposition
(POD)/Galerkin projection; linearized compressible Euler equations;
numerical stability; error estimates; penalty method
ID PROPER ORTHOGONAL DECOMPOSITION; NAVIER-STOKES EQUATIONS; POSTERIORI
ERROR-BOUNDS; FLUID-DYNAMICS; COHERENT STRUCTURES; PARABOLIC PROBLEMS;
PENALTY METHOD; FORMULATION; REDUCTION; SYSTEMS
AB A reduced order model (ROM) based on the proper orthogonal decomposition (POD)/Galerkin projection method is proposed as an alternative discretization of the linearized compressible Euler equations. It is shown that the numerical stability of the ROM is intimately tied to the choice of inner product used to define the Galerkin projection. For the linearized compressible Euler equations, a symmetry transformation motivates the construction of a weighted L(2) inner product that guarantees certain stability bounds satisfied by the ROM. Sufficient conditions for well-posedness and stability of the present Galerkin projection method applied to a general linear hyperbolic initial boundary value problem (IBVP) are stated and proven. Well-posed and stable far-field and solid wall boundary conditions are formulated for the linearized compressible Euler ROM using these more general results. A convergence analysis employing a stable penalty-like formulation of the boundary conditions reveals that the ROM solution converges to the exact solution with refinement of both the numerical solution used to generate the ROM and of the POD basis. An a priori error estimate for the computed ROM solution is derived, and examined using a numerical test case. Published in 2010 by John Wiley & Sons, Ltd.
C1 [Kalashnikova, I.] Stanford Univ, Inst Computat & Math Engn, Stanford, CA 94305 USA.
[Kalashnikova, I.] Sandia Natl Labs, Aerosci Dept, Albuquerque, NM 87185 USA.
[Barone, M. F.] Sandia Natl Labs, Wind & Water Power Technol Dept, Albuquerque, NM 87185 USA.
RP Kalashnikova, I (reprint author), Stanford Univ, Inst Computat & Math Engn, 496 Lomita Mall, Stanford, CA 94305 USA.
EM irinak@stanford.edu
FU Sandia National Laboratories; United States Department of Energy's
National Nuclear Security Administration [DE-AC04-94AL85000]; U.S.
Department of Defense; National Physical Science Consortium (NPSC);
Engineering Sciences Center at Sandia National Laboratories
FX This research was funded by Sandia National Laboratories Laboratory
Directed Research and Development (LDRD) program. 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. The
first author acknowledges the support of an NDSEG Fellowship sponsored
by the U.S. Department of Defense, and also the support of a National
Physical Science Consortium (NPSC) Fellowship, funded by the Engineering
Sciences Center at Sandia National Laboratories.
NR 40
TC 9
Z9 9
U1 2
U2 6
PU JOHN WILEY & SONS LTD
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND
SN 0029-5981
J9 INT J NUMER METH ENG
JI Int. J. Numer. Methods Eng.
PD SEP 3
PY 2010
VL 83
IS 10
BP 1345
EP 1375
DI 10.1002/nme.2867
PG 31
WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary
Applications
SC Engineering; Mathematics
GA 654IE
UT WOS:000282160900003
ER
PT J
AU Pereira, JH
Ralston, CY
Douglas, NR
Meyer, D
Knee, KM
Goulet, DR
King, JA
Frydman, J
Adams, PD
AF Pereira, Jose H.
Ralston, Corie Y.
Douglas, Nicholai R.
Meyer, Daniel
Knee, Kelly M.
Goulet, Daniel R.
King, Jonathan A.
Frydman, Judith
Adams, Paul D.
TI Crystal Structures of a Group II Chaperonin Reveal the Open and Closed
States Associated with the Protein Folding Cycle
SO JOURNAL OF BIOLOGICAL CHEMISTRY
LA English
DT Article
ID TRANSIENT KINETIC-ANALYSIS; 2.8 ANGSTROM RESOLUTION; GROEL-GROES
COMPLEXES; EUKARYOTIC CHAPERONIN; SUBSTRATE-BINDING; CYTOSOLIC
CHAPERONIN; ARCHAEAL CHAPERONIN; ATP-BINDING; IN-VIVO; MECHANISM
AB Chaperonins are large protein complexes consisting of two stacked multisubunit rings, which open and close in an ATP-dependent manner to create a protected environment for protein folding. Here, we describe the first crystal structure of a group II chaperonin in an open conformation. We have obtained structures of the archaeal chaperonin from Methanococcus maripaludis in both a peptide acceptor (open) state and a protein folding (closed) state. In contrast with group I chaperonins, in which the equatorial domains share a similar conformation between the open and closed states and the largest motions occurs at the intermediate and apical domains, the three domains of the archaeal chaperonin subunit reorient as a single rigid body. The large rotation observed from the open state to the closed state results in a 65% decrease of the folding chamber volume and creates a highly hydrophilic surface inside the cage. These results suggest a completely distinct closing mechanism in the group II chaperonins as compared with the group I chaperonins.
C1 [Pereira, Jose H.; Ralston, Corie Y.; Adams, Paul D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
[Douglas, Nicholai R.; Meyer, Daniel; Frydman, Judith] Stanford Univ, Dept Biol Sci, Stanford, CA 94305 USA.
[Douglas, Nicholai R.; Meyer, Daniel; Frydman, Judith] Stanford Univ, BioX Program, Stanford, CA 94305 USA.
[Knee, Kelly M.; Goulet, Daniel R.; King, Jonathan A.] MIT, Dept Biol, Cambridge, MA 02139 USA.
[Adams, Paul D.] Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA.
RP Adams, PD (reprint author), 1 Cyclotron Rd, Berkeley, CA 94720 USA.
EM pdadams@lbl.gov
RI Adams, Paul/A-1977-2013
OI Adams, Paul/0000-0001-9333-8219
FU Nanomedicine Development Center [2PN2EY016525]; NIGMS, National
Institutes of Health; Howard Hughes Medical Institute; Office of
Science, Office of Basic Energy Sciences, of the U. S. Department of
Energy [DE-AC02-05CH11231]
FX This work was performed as part of the Center for Protein Folding
Machinery and National Institutes of Health Roadmap-supported
Nanomedicine Development Center (Grant 2PN2EY016525). The Berkeley
Center for Structural Biology is supported in part by NIGMS, National
Institutes of Health, and the Howard Hughes Medical Institute. 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 DE-AC02-05CH11231.
NR 58
TC 39
Z9 39
U1 1
U2 6
PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
PI BETHESDA
PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3996 USA
SN 0021-9258
J9 J BIOL CHEM
JI J. Biol. Chem.
PD SEP 3
PY 2010
VL 285
IS 36
BP 27958
EP 27966
DI 10.1074/jbc.M110.125344
PG 9
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 644TL
UT WOS:000281404100050
PM 20573955
ER
PT J
AU Zhang, ZB
Platnick, S
Yang, P
Heidinger, AK
Comstock, JM
AF Zhang, Zhibo
Platnick, Steven
Yang, Ping
Heidinger, Andrew K.
Comstock, Jennifer M.
TI Effects of ice particle size vertical inhomogeneity on the passive
remote sensing of ice clouds
SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
LA English
DT Article
ID DROPLET EFFECTIVE RADIUS; BULK SCATTERING PROPERTIES; MU-M WINDOW;
CIRRUS CLOUDS; RADIATIVE PROPERTIES; TROPICAL CIRRUS; RESOLUTION;
RETRIEVAL; MODIS; PARAMETERIZATION
AB The solar reflectance bi-spectral (SRBS) and infrared split-window (IRSpW) methods are two of the most popular techniques for passive ice cloud property retrievals from multispectral imagers. Ice clouds are usually assumed to be vertically homogeneous in global operational algorithms based on these methods, although significant vertical variations of ice particle size are typically observed in ice clouds. In this study we investigate uncertainties in retrieved optical thickness, effective particle size, and ice water path introduced by a homogeneous cloud assumption in both the SRBS and IRSpW methods, and focus on whether the assumption can lead to significant discrepancies between the two methods. The study simulates the upwelling spectral radiance associated with vertically structured clouds and passes the results through representative SRBS and IRSpW retrieval algorithms. Cloud optical thickness is limited to values for which IRSpW retrievals are possible (optical thickness less than about 7). When the ice cloud is optically thin and yet has a significant ice particle size vertical variation, it is found that both methods tend to underestimate the effective radius and ice water path. The reason for the underestimation is the nonlinear dependence of ice particle scattering properties (extinction and single scattering albedo) on the effective radius. Because the nonlinearity effect is stronger in the IRSpW than the SRBS method, the IRSpW-based IWP tends to be smaller than the SRBS counterpart. When the ice cloud is moderately optically thick, the IRSpW method is relatively insensitive to cloud vertical structure and effective radius retrieval is weighted toward smaller ice particle size, while the weighting function makes the SRBS method more sensitive to the ice particle size in the upper portion of the cloud. As a result, when ice particle size increases monotonically toward cloud base, the two methods are in qualitative agreement; in the event that ice particle size decreases toward cloud base, the effective radius and ice water path retrievals based on the SRBS method are substantially larger than those from the IRSpW. The main findings of this study suggest that the homogenous cloud assumption can affect the SRBS and IRSpW methods to different extents and, consequently, can lead to significantly different retrievals. Therefore caution should be taken when comparing and combining the ice cloud property retrievals from these two methods.
C1 [Zhang, Zhibo] Univ Maryland, Goddard Earth Sci & Technol Ctr, Baltimore, MD 21228 USA.
[Comstock, Jennifer M.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Heidinger, Andrew K.] Natl Environm Satellite Data & Informat Serv, Ctr Satellite Applicat & Res, NOAA, Madison, WI 53706 USA.
[Platnick, Steven] NASA, Goddard Space Flight Ctr, Atmospheres Lab, Greenbelt, MD 20771 USA.
[Yang, Ping] Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA.
RP Zhang, ZB (reprint author), Univ Maryland, Goddard Earth Sci & Technol Ctr, 5523 Res Pk Dr,Ste 320, Baltimore, MD 21228 USA.
EM zzbatmos@umbc.edu
RI Yang, Ping/B-4590-2011; Zhang, Zhibo/D-1710-2010; Platnick,
Steven/J-9982-2014; Heidinger, Andrew/F-5591-2010
OI Zhang, Zhibo/0000-0001-9491-1654; Platnick, Steven/0000-0003-3964-3567;
Heidinger, Andrew/0000-0001-7631-109X
FU NASA [NNX08AP57G]; DOE
FX This work was funded in part by NASA's Radiation Sciences Program. P.
Yang acknowledges NASA support (NNX08AP57G). The contribution from J. M.
Comstock was supported by the DOE Atmospheric Radiation Measurement
Program. The authors thank the two reviewers for their insightful
comments, questions, and suggestions, which have helped to improve this
manuscript.
NR 72
TC 27
Z9 27
U1 2
U2 9
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-897X
EI 2169-8996
J9 J GEOPHYS RES-ATMOS
JI J. Geophys. Res.-Atmos.
PD SEP 3
PY 2010
VL 115
AR D17203
DI 10.1029/2010JD013835
PG 16
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 646WE
UT WOS:000281574000006
ER
PT J
AU Pornillos, O
Ganser-Pornillos, BK
Banumathi, S
Hua, YZ
Yeager, M
AF Pornillos, Owen
Ganser-Pornillos, Barbie K.
Banumathi, Sankaran
Hua, Yuanzi
Yeager, Mark
TI Disulfide Bond Stabilization of the Hexameric Capsomer of Human
Immunodeficiency Virus
SO JOURNAL OF MOLECULAR BIOLOGY
LA English
DT Article
DE HIV-1 capsid; hexamer; engineered disulfide bonds; electron microscopy;
X-ray crystallography
ID HIV-1 CAPSID PROTEIN; ROUS-SARCOMA-VIRUS; N-TERMINAL DOMAIN; IN-VITRO;
REVERSE-TRANSCRIPTASE; DIMERIZATION DOMAIN; ASSEMBLY PROPERTIES; TYPE-1;
CORE; RESOLUTION
AB The human immunodeficiency virus type 1 capsid is modeled as a fullerene cone that is composed of similar to 250 hexamers and 12 pentamers of the viral CA protein. Structures of CA hexamers have been difficult to obtain because the hexamer-stabilizing interactions are inherently weak, and CA tends to spontaneously assemble into capsid-like particles. Here, we describe a two-step biochemical strategy to obtain soluble CA hexamers for crystallization. First, the hexamer was stabilized by engineering disulfide cross-links (either A14C/E45C or A42C/T54C) between the N-terminal domains of adjacent subunits. Second, the cross-linked hexamers were prevented from polymerizing further into hyperstable capsid-like structures by mutations (W184A and M185A) that interfered with dimeric association between the C-terminal domains that link adjacent hexamers. The structures of two different cross-linked CA hexamers were nearly identical, and we combined the non-mutated portions of the structures to generate an atomic resolution model for the native hexamer. This hybrid approach for structure determination should be applicable to other viral capsomers and protein-protein complexes in general. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Pornillos, Owen; Ganser-Pornillos, Barbie K.; Yeager, Mark] Univ Virginia, Dept Mol Physiol & Biol Phys, Charlottesville, VA 22908 USA.
[Pornillos, Owen; Ganser-Pornillos, Barbie K.; Hua, Yuanzi; Yeager, Mark] Scripps Res Inst, Dept Cell Biol, La Jolla, CA 92037 USA.
[Banumathi, Sankaran] Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Struct Genom, Collaborat Crystallog Program, Berkeley, CA 94720 USA.
RP Yeager, M (reprint author), Univ Virginia, Dept Mol Physiol & Biol Phys, POB 800736, Charlottesville, VA 22908 USA.
EM yeager@virginia.edu
FU National Institutes of Health through the National Center for Research
Resources [RR17573]; Office of Science, Office of Basic Energy Sciences,
of the U.S. Department of Energy [DE-AC02-05CH11231]; National
Institutes of Health [R01-GM066087, P50-GM082545]
FX We thank W.I. Sundquist (University of Utah) for sharing unpublished
data. We also thank Kelly Dryden for help with figure preparation. EM
experiments were conducted at the National Resource for Automated
Molecular Microscopy, which is supported by the National Institutes of
Health through the National Center for Research Resources' P41 program
(RR17573). Diffraction data were collected at the Advanced Light Source,
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. This study was funded by National Institutes of
Health grants to M.Y. (R01-GM066087 and P50-GM082545).
NR 43
TC 47
Z9 47
U1 0
U2 11
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 SEP 3
PY 2010
VL 401
IS 5
BP 985
EP 995
DI 10.1016/j.jmb.2010.06.042
PG 11
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 643NR
UT WOS:000281303900024
PM 20600115
ER
PT J
AU Peshkin, M
AF Peshkin, Murray
TI Against a proposed alternative explanation of the Aharonov-Bohm effect
SO JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
LA English
DT Article; Proceedings Paper
CT Conference on Aharonov-Bohm Effect and Berry Phase 50/25 Anniversary
CY DEC 14-15, 2009
CL Bristol Univ, Bristol, ENGLAND
HO Bristol Univ
AB The Aharonov-Bohm (AB) effect is understood to demonstrate that the Maxwell fields can act nonlocally in some situations. However it has been suggested from time to time that the AB effect is somehow a consequence of a local classical electromagnetic field phenomenon involving energy that is temporarily stored in the overlap between the external field and the field of which the beam particle is the source. That idea was shown in the past not to work for some models of the source of the external field. Here a more general proof is presented for the magnetic AB effect to show that the overlap energy is always compensated by another contribution to the energy of the magnetic field in such a way that the sum of the two is independent of the external flux. Therefore no such mechanism can underlie the AB effect.
C1 Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
RP Peshkin, M (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
EM peshkin@anl.gov
NR 9
TC 0
Z9 0
U1 0
U2 3
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 1751-8113
J9 J PHYS A-MATH THEOR
JI J. Phys. A-Math. Theor.
PD SEP 3
PY 2010
VL 43
IS 35
AR 354031
DI 10.1088/1751-8113/43/35/354031
PG 5
WC Physics, Multidisciplinary; Physics, Mathematical
SC Physics
GA 637VS
UT WOS:000280847400032
ER
PT J
AU Hao, F
Armiento, R
Mattsson, AE
AF Hao, Feng
Armiento, Rickard
Mattsson, Ann E.
TI Subsystem functionals and the missing ingredient of confinement physics
in density functionals
SO PHYSICAL REVIEW B
LA English
DT Article
ID SELF-INTERACTION CORRECTION; ELECTRON-GAS; EXACT EXCHANGE;
APPROXIMATIONS; SYSTEMS; ENERGY; NUMBER
AB The subsystem functional scheme is a promising approach recently proposed for constructing exchange-correlation density functionals. In this scheme, the physics in each part of real materials is described by mapping to a characteristic model system. The "confinement physics," an essential physical ingredient that has been left out in present functionals, is studied by employing the harmonic-oscillator (HO) gas model. By performing the potential -> density and the density -> exchange energy per particle mappings based on two model systems characterizing the physics in the interior (uniform electron-gas model) and surface regions (Airy gas model) of materials for the HO gases, we show that the confinement physics emerges when only the lowest subband of the HO gas is occupied by electrons. We examine the approximations of the exchange energy by several state-of-the-art functionals for the HO gas, and none of them produces adequate accuracy in the confinement dominated cases. A generic functional that incorporates the description of the confinement physics is needed.
C1 [Hao, Feng; Mattsson, Ann E.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Armiento, Rickard] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA.
RP Hao, F (reprint author), Sandia Natl Labs, MS 1322, Albuquerque, NM 87185 USA.
EM fhao@sandia.gov; armiento@mit.edu; aematts@sandia.gov
RI Armiento, Rickard/E-1413-2011
OI Armiento, Rickard/0000-0002-5571-0814
FU Laboratory Directed Research and Development Program; U.S. Department of
Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
FX We thank W. Kohn and R. J. Magyar for valuable discussions. This work
was supported by the Laboratory Directed Research and Development
Program. Sandia National Laboratories is a multiprogram laboratory
operated by Sandia Corporation, a wholly owned subsidiary of Lockheed
Martin Company, for the U.S. Department of Energy's National Nuclear
Security Administration under Contract No. DE-AC04-94AL85000.
NR 48
TC 6
Z9 6
U1 0
U2 4
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 SEP 3
PY 2010
VL 82
IS 11
AR 115103
DI 10.1103/PhysRevB.82.115103
PG 9
WC Physics, Condensed Matter
SC Physics
GA 646DK
UT WOS:000281516300002
ER
PT J
AU D'Elia, M
Mukherjee, S
Sanfilippo, F
AF D'Elia, Massimo
Mukherjee, Swagato
Sanfilippo, Francesco
TI QCD phase transition in a strong magnetic background
SO PHYSICAL REVIEW D
LA English
DT Article
ID HEAVY-ION COLLISIONS; ELECTROMAGNETIC-FIELD; SYMMETRY; MOMENTS; MODEL
AB We investigate the properties of the deconfining/chiral restoring transition for two flavor QCD in the presence of a uniform background magnetic field. We adopt standard staggered fermions and a lattice spacing of the order of 0.3 fm. We explore different values of the bare quark mass, corresponding to pion masses in the range 200-480 MeV, and magnetic fields up to vertical bar e vertical bar B similar to 0: 75 GeV2. The deconfinement and chiral symmetry restoration temperatures remain compatible with each other and rise very slightly (< 2% for our largest magnetic field) as a function of the magnetic field. On the other hand, the transition seems to become sharper as the magnetic field increases.
C1 [D'Elia, Massimo] Univ Genoa, Dipartimento Fis, I-16146 Genoa, Italy.
[D'Elia, Massimo] Ist Nazl Fis Nucl, Sez Genova, I-16146 Genoa, Italy.
[Mukherjee, Swagato] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA.
[Sanfilippo, Francesco] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy.
[Sanfilippo, Francesco] Ist Nazl Fis Nucl, Sez Roma, I-00185 Rome, Italy.
RP D'Elia, M (reprint author), Univ Genoa, Dipartimento Fis, Via Dodecaneso 33, I-16146 Genoa, Italy.
RI Sanfilippo, Francesco/P-9914-2016;
OI Sanfilippo, Francesco/0000-0002-1333-745X; Mukherjee,
Swagato/0000-0002-3824-1008
FU U.S. Department of Energy [DE-AC02-98CH10886]
FX Numerical simulations have been carried out on two computer farms in
Genova and Bari and on the apeNEXT facilities in Rome. We thank E.
Fraga, K. Fukushima, K. Klimenko, M. Ruggieri, and H. Suganuma for
useful discussions. S. M. has been supported under Contract No.
DE-AC02-98CH10886 with the U.S. Department of Energy.
NR 33
TC 152
Z9 152
U1 0
U2 2
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 SEP 3
PY 2010
VL 82
IS 5
AR 051501
DI 10.1103/PhysRevD.82.051501
PG 5
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 646DQ
UT WOS:000281517100001
ER
PT J
AU Gardner, S
Latimer, DC
AF Gardner, Susan
Latimer, David C.
TI Dark matter constraints from a cosmic index of refraction
SO PHYSICAL REVIEW D
LA English
DT Article
ID LIGHT; SCATTERING; VELOCITY
AB The dark matter candidates of particle physics invariably possess electromagnetic interactions, if only via quantum fluctuations. Taken en masse, dark matter can thus engender an index of refraction which deviates from its vacuum value. Its presence is signaled through frequency-dependent effects in the propagation and attenuation of light. We discuss theoretical constraints on the expansion of the index of refraction with frequency, the physical interpretation of the terms, and the particular observations needed to isolate its coefficients. This, with the advent of new opportunities to view gamma-ray bursts at cosmological distance scales, gives us a new probe of dark matter and a new possibility for its direct detection. As a first application we use the time delay determined from radio afterglow observations of distant gamma-ray bursts to realize a direct limit on the electric charge-to-mass ratio of dark matter of vertical bar epsilon vertical bar/M < 1 X 10(-5) eV(-1) at 95% C.L.
C1 [Gardner, Susan; Latimer, David C.] Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Batavia, IL 60510 USA.
[Gardner, Susan] Fermilab Natl Accelerator Lab, Dept Theoret Phys, Batavia, IL 60510 USA.
[Gardner, Susan; Latimer, David C.] Univ Kentucky, Dept Phys & Astron, Lexington, KY 40506 USA.
RP Gardner, S (reprint author), Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, POB 500, Batavia, IL 60510 USA.
FU U.S. Department of Energy [DE-FG02-96ER40989]
FX We thank Keith Olive for an inspiring question and Scott Dodelson, Renee
Fatemi, Wolfgang Korsch, and Tom Troland for helpful comments. S.G.
would also like to thank Stan Brodsky for imparting an appreciation of
the low-energy theorems in Compton scattering and the Institute for
Nuclear Theory and the Center for Particle Astrophysics and Theoretical
Physics at Fermilab for their gracious hospitality. This work is
supported, in part, by the U.S. Department of Energy under Contract No.
DE-FG02-96ER40989.
NR 40
TC 5
Z9 5
U1 0
U2 3
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 SEP 3
PY 2010
VL 82
IS 6
AR 063506
DI 10.1103/PhysRevD.82.063506
PG 5
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 646DS
UT WOS:000281517300003
ER
PT J
AU Perera, UGE
Kulik, HJ
Iancu, V
da Silva, LGGVD
Ulloa, SE
Marzari, N
Hla, SW
AF Perera, U. G. E.
Kulik, H. J.
Iancu, V.
da Silva, L. G. G. V. Dias
Ulloa, S. E.
Marzari, N.
Hla, S. -W.
TI Spatially Extended Kondo State in Magnetic Molecules Induced by
Interfacial Charge Transfer
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID IMPURITY; INSULATORS; RESONANCE
AB An extensive redistribution of spin density in TBrPP-Co molecules adsorbed on a Cu(111) surface is investigated by monitoring Kondo resonances at different locations on single molecules. Remarkably, the width of the Kondo resonance is found to be much larger on the organic ligands than on the central cobalt atom-reflecting enhanced spin-electron interactions on molecular orbitals. This unusual effect is explained by means of first-principles and numerical renormalization-group calculations highlighting the possibility to engineer spin polarization by exploiting interfacial charge transfer.
C1 [Perera, U. G. E.; Iancu, V.; da Silva, L. G. G. V. Dias; Ulloa, S. E.; Hla, S. -W.] Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA.
[Kulik, H. J.; Marzari, N.] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA.
[da Silva, L. G. G. V. Dias] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[da Silva, L. G. G. V. Dias] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
RP Hla, SW (reprint author), Ohio Univ, Dept Phys & Astron, Athens, OH 45701 USA.
EM hla@ohio.edu
RI Iancu, Violeta/B-7657-2008; Ulloa, Sergio/F-4621-2011; Dias da Silva,
Luis/D-8381-2013; Marzari, Nicola/D-6681-2016
OI Iancu, Violeta/0000-0003-1146-2959; Ulloa, Sergio/0000-0002-3091-4984;
Dias da Silva, Luis/0000-0002-8156-9463; Marzari,
Nicola/0000-0002-9764-0199
FU U.S. Department of Energy, BES [DE-FG02-02ER46012]; NSF [0730257,
07010581, 0706020]
FX We acknowledge financial support from the U.S. Department of Energy, BES
grant DE-FG02-02ER46012, NSF-PIRE-OISE 0730257, NSF-WMN 07010581,
NSF-DMR 0706020, and ARO-MURI DAAD-19-03-1-0169 (H. J. K., N. M.).
Computational facilities were provided through the PNNL Grant No.
EMSL-UP-9597.
NR 29
TC 43
Z9 43
U1 5
U2 53
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 SEP 3
PY 2010
VL 105
IS 10
AR 106601
DI 10.1103/PhysRevLett.105.106601
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 646EE
UT WOS:000281518800006
PM 20867535
ER
PT J
AU Rodriguez, J
Aczel, AA
Carlo, JP
Dunsiger, SR
MacDougall, GJ
Russo, PL
Savici, AT
Uemura, YJ
Wiebe, CR
Luke, GM
AF Rodriguez, J.
Aczel, A. A.
Carlo, J. P.
Dunsiger, S. R.
MacDougall, G. J.
Russo, P. L.
Savici, A. T.
Uemura, Y. J.
Wiebe, C. R.
Luke, G. M.
TI Study of the Ground State Properties of LiHoxY1-xF4 Using Muon Spin
Relaxation
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID LITHIUM HOLMIUM FLUORIDE; NONLINEAR SUSCEPTIBILITY; GLASS TRANSITION;
FERROMAGNETISM; TB2MO2O7; LIHOF4
AB LiHoxY1-xF4 is an insulator where the magnetic Ho3+ ions have an Ising character and interact mainly through magnetic dipolar fields. We used the muon spin relaxation technique to study the nature of its ground state for samples with x <= 0.25. In contrast with some previous works, we did not find canonical spin glass behavior down to approximate to 15 mK. Instead, below approximate to 300 mK we observed temperature-independent dynamic magnetism characterized by a single correlation time. The 300 mK energy scale corresponds to the Ho3+ hyperfine interaction strength, suggesting that this interaction may be involved in the dynamic behavior of the system.
C1 [Rodriguez, J.; Aczel, A. A.; Dunsiger, S. R.; MacDougall, G. J.; Luke, G. M.] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada.
[Rodriguez, J.] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland.
[Carlo, J. P.; Russo, P. L.; Savici, A. T.; Uemura, Y. J.] Columbia Univ, Dept Phys, New York, NY 10027 USA.
[Dunsiger, S. R.] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany.
[MacDougall, G. J.; Savici, A. T.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
[Wiebe, C. R.] Univ Winnipeg, Dept Chem, Winnipeg, MB R3B 2E9, Canada.
[Luke, G. M.] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada.
RP Rodriguez, J (reprint author), McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada.
EM Jose.Rodriguez@psi.ch
RI Savici, Andrei/F-2790-2013; Luke, Graeme/A-9094-2010; Aczel,
Adam/A-6247-2016;
OI Savici, Andrei/0000-0001-5127-8967; Aczel, Adam/0000-0003-1964-1943;
Luke, Graeme/0000-0003-4762-1173; MacDougall,
Gregory/0000-0002-7490-9650
FU NSERC; CIFAR; NSF at Columbia [DMR-05-02706, DMR-08-06846]
FX We would like to thank M. J. P. Gingras and M. Schechter for having very
interesting discussions with us and for their useful comments. Research
at McMaster and University of Winnipeg is supported by NSERC and CIFAR.
We acknowledge financial support from NSF DMR-05-02706 and DMR-08-06846
(Materials World Network program) at Columbia.
NR 30
TC 7
Z9 7
U1 0
U2 6
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 SEP 3
PY 2010
VL 105
IS 10
AR 107203
DI 10.1103/PhysRevLett.105.107203
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 646EE
UT WOS:000281518800008
PM 20867545
ER
PT J
AU Jeong, JW
Cho, JW
Jung, IW
Solgaard, O
AF Jeong, J. W.
Cho, J. W.
Jung, I. W.
Solgaard, O.
TI Amplified spontaneous emission rejection with multi-functional MEMS
tunable filter
SO ELECTRONICS LETTERS
LA English
DT Article
ID OPTICAL FILTER
AB A multi-functional microelectromechanical system (MEMS) tunable optical filter as an amplified spontaneous emission (ASE) rejection filter in an optical communication system is presented. The MEMS tunable filter can tune both the centre wavelength and the passband independently and continuously in C-band. This filter was applied to a 10 Gbit/s system and system-performance improvement by adjusting the amount of ASE noise rejection was observed.
C1 [Jeong, J. W.; Solgaard, O.] Stanford Univ, Dept Elect Engn, EL Ginzton Lab, Stanford, CA 94305 USA.
[Cho, J. W.] ClariPhy Commun Inc, Los Altos, CA 94022 USA.
[Jung, I. W.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
RP Jeong, JW (reprint author), Stanford Univ, Dept Elect Engn, EL Ginzton Lab, Stanford, CA 94305 USA.
EM jjeong1@stanford.edu
NR 5
TC 0
Z9 0
U1 0
U2 5
PU INST ENGINEERING TECHNOLOGY-IET
PI HERTFORD
PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD SG1 2AY, ENGLAND
SN 0013-5194
J9 ELECTRON LETT
JI Electron. Lett.
PD SEP 2
PY 2010
VL 46
IS 18
BP 1275
EP U57
DI 10.1049/el.2010.0957
PG 2
WC Engineering, Electrical & Electronic
SC Engineering
GA 648KY
UT WOS:000281693800022
ER
PT J
AU Scheer, AM
Mukarakate, C
Robichaud, DJ
Ellison, GB
Nimlos, MR
AF Scheer, Adam M.
Mukarakate, Calvin
Robichaud, David J.
Ellison, G. Barney
Nimlos, Mark R.
TI Radical Chemistry in the Thermal Decomposition of Anisole and Deuterated
Anisoles: An Investigation of Aromatic Growth
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID INITIO MO/STATISTICAL THEORY; INFRARED-ABSORPTION SPECTRA; GAS-PHASE
PYROLYSIS; PHOTOELECTRON-SPECTROSCOPY; AB-INITIO; HYDROCARBON FORMATION;
PROPARGYL RADICALS; RING-EXPANSION; SHOCK-WAVES; UNIMOLECULAR
ISOMERIZATION/DECOMPOSITION
AB The pyrolyses of anisole (C6H5OCH3), d(3)-anisole (C6HSOCD3), and d(8)-anisole (C6D5OCD3) have been studied using a hyperthermal tubular reactor and photoionization reflectron time-of-flight mass spectrometer. Gas exiting the reactor is subject to an immediate supersonic expansion after a residence time of approximately 65 mu s. This allows the detection of highly reactive radical intermediates. Our results confirm that the first steps in the thermal decomposition of anisole are the loss of a methyl group to form phenoxy radical, followed by ejection of a CO to form cyclopentadienyl radical (c-C5H5); C6H5OCH3 -> C6HSO + CH3; C6HSO -> c-C5H5 + CO. At high temperatures (T-wall = 1200 degrees C - 1300 degrees C) the c-C5H5 decomposes to propargyl radical (CH2CCH) and acetylene; c-C5H5 -> CH2CCH + C2H2. The formation of benzene and naphthalene is demonstrated with 1 + 1 resonance-enhanced multiphoton ionization. Propargyl radical recombination is a significant benzene formation channel. However, we show the majority of benzene is formed by a ring expansion reaction of methylcyclopentadiene (C5H5CH3) resulting from methyl radical addition to cyclopentadienyl radical; CH3 + c-C5H5 -> C5H5CH3 -> C6H6 + 2H. The naphthalene is generated from cyclopentadienyl radical recombination; 2c-C5H5 -> C5H5-C5H5 -> C10H8 + 2H. The respective intermediate amu 79 and 129 species associated with these reactions are detected, confirming the stepwise nature of the decompositions. These reactions are verified by pyrolysis studies of cyclopentadiene (C5H6) and C5H5CH3 obtained from rapid thermal dissociation of the respective dimer compounds, as well as pyrolysis studies of propargyl bromide (BrCH2CCH).
C1 [Scheer, Adam M.; Mukarakate, Calvin; Robichaud, David J.; Nimlos, Mark R.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
[Scheer, Adam M.; Ellison, G. Barney] Univ Colorado, Dept Chem & Biochem, Boulder, CO 80309 USA.
RP Nimlos, MR (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA.
EM mark.nimlos@nrel.gov
FU U.S. DOE Office
FX The U.S. DOE Office of the Biomass Program provided funding for this
work. We thank Donald David, Ken Smith, Mark Jarvis, and An Gayle
Vasiliou for technical support and Dr. Anthony Dean and Dr.
Hans-Heinrich Carstensen for useful discussions.
NR 92
TC 45
Z9 46
U1 3
U2 45
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 SEP 2
PY 2010
VL 114
IS 34
BP 9043
EP 9056
DI 10.1021/jp102046p
PG 14
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 641LW
UT WOS:000281128900015
PM 20695633
ER
PT J
AU Wang, XB
Fu, QA
Yang, JL
AF Wang, Xue-Bin
Fu, Qiang
Yang, Jinlong
TI Electron Affinities and Electronic Structures of o-, m-, and
p-Hydroxyphenoxyl Radicals: A Combined Low-Temperature Photoelectron
Spectroscopic and Ab Initio Calculation Study
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID PHOTOSYNTHETIC REACTION CENTERS; MULTIPLY-CHARGED ANIONS; GAS-PHASE;
RHODOBACTER-SPHAEROIDES; BENZOQUINONE ANIONS; GALACTOSE-OXIDASE;
PHOTOSYSTEM-II; ACTIVE-SITE; PHOTODETACHMENT; STATES
AB Hydroxyl substituted phenoxides, o-, m-, p-HO(C6H4)O-, and the corresponding neutral radicals are important species; in particular, the p-isomer pair, i.e., p-HO(C6H4)O- and p-HO(C6H4)O center dot, is directly involved in the proton-coupled electron transfer in biological photosynthetic centers. Here we report the first spectroscopic study of these species in the gas phase by means of low-temperature photoelectron spectroscopy (PES) and ab initio calculations. Vibrationally resolved PES spectra were obtained at 70 K and at several photon energies for each anion, directly yielding electron affinity (EA) and electronic structure information for the corresponding hydroxyphenoxyl radical. The EAs are found to vary with OH positions, from 1.990 +/- 0.010 (p) to 2.315 +/- 0.010 (o) and 2.330 +/- 0.010 (m) eV. Theoretical calculations were carried out to identify the optimized molecular structures for both anions and neutral radicals. The electron binding energies and excited state energies were also calculated to compare with experimental data. Excellent agreement is found between calculations and experiments. Molecular orbital analyses indicate a strong OH antibonding interaction with the phenoxide moiety for the o- as well as the p-isomer, whereas such an interaction is largely missing for the m-anion. The variance of EAs among three isomers is interpreted primarily due to the interplay between two competing factors: the OH antibonding interaction and the H-bonding stabilization (existed only in the o-anion).
C1 [Wang, Xue-Bin] Washington State Univ, Dept Phys, Richland, WA 99354 USA.
[Wang, Xue-Bin] Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
[Fu, Qiang; Yang, Jinlong] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China.
RP Wang, XB (reprint author), Washington State Univ, Dept Phys, 2710 Univ Dr, Richland, WA 99354 USA.
EM xuebin.wang@pnl.gov; jlyang@ustc.edu.cn
RI Yang, Jinlong/D-3465-2009; Fu, Qiang/A-2557-2011
OI Yang, Jinlong/0000-0002-5651-5340; Fu, Qiang/0000-0002-6682-8527
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; National Natural Science
Foundation of China [50721091, 20803071, 20873129]; National Key Basic
Research Program [2006CB922004]; USTC-HP HPC; Shanghai Supercomputer
Center
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. Computational work was supported by the National Natural
Science Foundation of China (Grants 50721091, 20803071, 20873129), the
National Key Basic Research Program (2006CB922004), the USTC-HP HPC
Project, SCCAS, and the Shanghai Supercomputer Center.
NR 54
TC 15
Z9 15
U1 1
U2 13
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 SEP 2
PY 2010
VL 114
IS 34
BP 9083
EP 9089
DI 10.1021/jp103752t
PG 7
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 641LW
UT WOS:000281128900019
PM 20669925
ER
PT J
AU Mirjanian, D
Dickey, AN
Hoh, JH
Woolf, TB
Stevens, MJ
AF Mirjanian, Dina
Dickey, Allison N.
Hoh, Jan H.
Woolf, Thomas B.
Stevens, Mark J.
TI Splaying of Aliphatic Tails Plays a Central Role in Barrier Crossing
During Liposome Fusion
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID ENSEMBLE MOLECULAR-DYNAMICS; COARSE-GRAINED MODEL; MEMBRANE-FUSION;
UNILAMELLAR VESICLES; BILAYER-MEMBRANES; SIMULATIONS; MECHANISM;
HEMIFUSION; ALGORITHMS; TENSION
AB The fusion between two lipid bilayers involves crossing a complicated energy landscape. The limiting barrier in the process appears to be between two closely opposed bilayers and the intermediate state where the outer leaflets are fused. We have performed molecular dynamics simulations to characterize the free energy barrier for the fusion of two liposomes and to examine the molecular details of barrier crossing. To capture the slow dynamics of fusion, a model using coarse-grained representations of lipids was used. The fusion between pairs of liposomes was simulated for four systems: DPPC, DOPC, a 3:1 mixture of DPPC/DPPE, and an asymmetric lipid tail system in which one tail of DPPC was reduced to half the length (ASTail). The weighted histogram method was used to compute the free energy as a function of separation distance. The relative barrier heights for these systems was found to be ASTail DPPC >> DPPC/DPPE > DOPC, in agreement with experimental observations. Further, the free energy curves for all four can be overlaid on a single curve by plotting the free energy versus the surface separation (differing only in the point of fusion). These simulations also confirm that the two main contributions to the free energy barrier are the removal of water between the vesicles and the deformation of the vesicle. The most prominent molecular detail of barrier crossing in all cases examined was the splaying of lipid tails, where initially a single splayed lipid formed a bridge between the two outer leaflets that promotes additional lipid mixing between the vesicles and eventually leads to fusion. The tail splay appears to be closely connected to the energetics of the process. For example, the high barrier for the ASTail is the result of a smaller distance between terminal methyl groups in the splayed molecule. The shortening of this distance requires the liposomes to be closer together, which significantly increases the cost of water removal and bilayer deformation. Before tail splay can initiate fusion, contact must occur between a tail end and the external water. In isolated vesicles, the contact fraction is correlated to the fusogenicity difference between DPPC and DOPC. Moreover, for planar bilayers, the contact fraction is much lower for DPPC, which is consistent with its lack of fusion in giant vesicles. The simulation results show the key roles of lipid tail dynamics in governing the fusion energy landscape.
C1 [Mirjanian, Dina; Dickey, Allison N.; Stevens, Mark J.] Sandia Natl Labs, Ctr Integrated Nanotechol, Albuquerque, NM 87185 USA.
[Hoh, Jan H.; Woolf, Thomas B.] Johns Hopkins Univ, Sch Med, Baltimore, MD USA.
RP Stevens, MJ (reprint author), Sandia Natl Labs, Ctr Integrated Nanotechol, POB 5800, Albuquerque, NM 87185 USA.
OI Hoh, Jan/0000-0003-3842-9454
FU NIH NIGMS [5R21GM076443]; U S Department of Energy [DE-AC04-94AL85000]
FX This work was funded by NIH NIGMS Grant 5R21GM076443 and was performed,
in part, at the Center for Integrated Nanotechnologies, a U S Department
of Energy, Office of Basic Energy Sciences 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 36
TC 29
Z9 29
U1 2
U2 24
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 SEP 2
PY 2010
VL 114
IS 34
BP 11061
EP 11068
DI 10.1021/jp1055182
PG 8
WC Chemistry, Physical
SC Chemistry
GA 641LU
UT WOS:000281128700017
PM 20701307
ER
PT J
AU Catarino, T
Pessanha, M
De Candia, AG
Gouveia, Z
Fernandes, AP
Pokkuluri, PR
Murgida, D
Marti, MA
Todorovic, S
Salgueiro, CA
AF Catarino, Teresa
Pessanha, Miguel
De Candia, Ariel G.
Gouveia, Zelia
Fernandes, Ana P.
Pokkuluri, P. Raj
Murgida, Daniel
Marti, Marcelo A.
Todorovic, Smilja
Salgueiro, Carlos A.
TI Probing the Chemotaxis Periplasmic Sensor Domains from Geobacter
sulfurreducens by Combined Resonance Raman and Molecular Dynamic
Approaches: NO and CO Sensing
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID SOLUBLE GUANYLATE-CYCLASE; NITRIC-OXIDE BINDING; HEME-PROTEINS;
CYTOCHROME C'; LIGAND DISCRIMINATION; SIGNAL-TRANSDUCTION;
CARBON-MONOXIDE; MECHANISM; IRON; BOND
AB The periplasmic sensor domains encoded by genes gsu0582 and gsu0935 are part of methyl accepting chemotaxis proteins in the bacterium Geobacter sulfurreducens (Gs). The sensor domains of these proteins contain a heme-c prosthetic group and a PAS-like fold as revealed by their crystal structures. Biophysical studies of the two domains showed that nitric oxide (NO) binds to the heme in both the ferric and ferrous forms, whereas carbon monoxide (CO) binds only to the reduced form. In order to address these exogenous molecules as possible physiological ligands, binding studies and resonance Raman (RR) spectroscopic characterization of the respective CO and NO adducts were performed in this work. In the absence of exogenous ligands, typical RR frequencies of five-coordinated (5c) high-spin and six-coordinated (6c) low-spin species were observed in the oxidized form. In the reduced state, only frequencies corresponding to the latter were detected. In both sensors, CO binding yields 6c low-spin adducts by replacing the endogenous distal ligand. The binding of NO by the two proteins causes partial disruption of the proximal Fe-His bond, as revealed by the RR fingerprint features of 5cFe-NO and 6cNO-Fe-His species. The measured CO and NO dissociation constants of ferrous GSU0582 and GSU0935 sensors reveal that both proteins have high and similar affinity toward these molecules (K(d) approximate to 0.04-0.08 mu M). On the contrary, in the ferric form, sensor GSU0582 showed a much higher affinity for NO (K(d) approximate to 0.3 mu M for GSU0582 versus 17 mu M for GSU0935). Molecular dynamics calculations revealed a more open heme pocket in GSU0935, which could account for the different affinities for NO. Taken together, spectroscopic data and MD calculations revealed subtle differences in the binding properties and structural features of formed CO and NO adducts, but also indicated a possibility that a (5c) high-spin/(6c) low-spin redox-linked equilibrium could drive the physiological sensing of Gs cells.
C1 [Catarino, Teresa; Pessanha, Miguel; Gouveia, Zelia; Todorovic, Smilja] Univ Nova Lisboa, Inst Tecnol Quim & Biol, P-2780157 Oeiras, Portugal.
[De Candia, Ariel G.; Murgida, Daniel; Marti, Marcelo A.] Univ Buenos Aires, Dept Quim Inorgan Anal & Quim Fis, INQUIMAE CONICET, Fac Ciencias Exactas & Nat, Buenos Aires, DF, Argentina.
[Catarino, Teresa; Salgueiro, Carlos A.] Univ Nova Lisboa, Dept Quim, Fac Ciencias & Tecnol, CQFB, P-2829516 Caparica, Portugal.
[Pokkuluri, P. Raj] Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA.
RP Todorovic, S (reprint author), Univ Nova Lisboa, Inst Tecnol Quim & Biol, Av Republ EAN, P-2780157 Oeiras, Portugal.
RI Todorovic, Smilja/F-7612-2010; Salgueiro, Carlos/A-4522-2013; REQUIMTE,
SMB/M-5694-2013; REQUIMTE, UCIBIO/N-9846-2013; Fernandes,
Ana/B-2940-2014; Catarino, Teresa/A-9267-2012;
OI Todorovic, Smilja/0000-0002-0219-6743; Salgueiro,
Carlos/0000-0003-1136-809X; Fernandes, Ana/0000-0002-5201-7993;
Catarino, Teresa/0000-0003-3782-4014; Marti, Marcelo/0000-0002-7911-9340
FU Fundacio para a Ciencia c a Tecnologia (FCT, Portugal),
[PTDC/BIA-PRO/74498/2006, PTDC/QUI/64550/2006]; U.S. Department of
Energy's Office of Science, Biological and Environmental Research
[PICT06-25667, PICT2006-459, DE-AC02-06CH11357]; FCT, Portugal
[BPD/20571/2004]; CONICET; [PICT07-01650]; [UBA (08-X625)]
FX This work was supported by Project Grants PTDC/BIA-PRO/74498/2006 to C
A.S and PTDC/QUI/64550/2006 to S T. from Fundacio para a Ciencia c a
Tecnologia (FCT, Portugal), PICT07-01650 and UBA (08-X625) to M A M
PICT06-25667 and PICT2006-459 to D.H.M.: U.S. Department of Energy's
Office of Science, Biological and Environmental Research GTI, Program
under Contract No DE-AC02-06CH11357 M A M and D M are staff members of
CONICET M P and A D C are recipients of postdoctoral grants
BPD/20571/2004 (FCT, Portugal) and CONICET, respectively We thank M
Schiffer for critical reading of the manuscript and Y Y. Loncler for
sensor plasmids and invaluable technical support
NR 39
TC 8
Z9 8
U1 0
U2 13
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 SEP 2
PY 2010
VL 114
IS 34
BP 11251
EP 11260
DI 10.1021/jp1029882
PG 10
WC Chemistry, Physical
SC Chemistry
GA 641LU
UT WOS:000281128700036
PM 20690670
ER
PT J
AU Storoniak, P
Mazurkiewicz, K
Haranczyk, M
Gutowski, M
Rak, J
Eustis, SN
Ko, YJ
Wang, HP
Bowen, KH
AF Storoniak, Piotr
Mazurkiewicz, Kamil
Haranczyk, Maciej
Gutowski, Maciej
Rak, Janusz
Eustis, Soren N.
Ko, Yeon Jae
Wang, Haopeng
Bowen, Kit H.
TI The Anionic (9-Methyladenine)-(1-Methylthymine) Base Pair Solvated by
Formic Acid. A Computational and Photoelectron Spectroscopy Study
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID INTERMOLECULAR PROTON-TRANSFER; EXCESS ELECTRON-ATTACHMENT; DNA-STRAND
BREAKS; MOLECULAR-ORBITAL CALCULATIONS; HYDROGEN-BONDED COMPLEXES;
THEORETICAL AB-INITIO; LOW-ENERGY ELECTRONS; GAUSSIAN-TYPE BASIS;
RADICAL IONS; IONIZATION-POTENTIALS
AB The photoelectron spectrum for (1-methylthymine)-(9-methyladenine)center dot center dot center dot(formic acid) (1MT-9MA center dot center dot center dot FA) anions with the maximum at ca. 1.87 eV was recorded with 2.54 eV photons and interpreted through the quantum-chemical modeling carried out at the B3LYP/6-31+G(d,p) level. The relative free energies of the anions and their calculated vertical detachment energies suggest that only seven anionic structures contribute to the observed PES signal. We demonstrate that electron binding to the (1MT-9MA center dot center dot center dot FA) complex can trigger intermolecular proton transfer from formic acid, leading to the strong stabilization of the resulting radical anion. The SOMO distribution indicates that an excess electron may localize not only on the pyrimidine but also on the purine moiety. The biological context of DNA-environment interactions concerning the formation of single-strand breaks induced by excess electrons has been briefly discussed.
C1 [Storoniak, Piotr; Mazurkiewicz, Kamil; Rak, Janusz] Univ Gdansk, Dept Chem, PL-80952 Gdansk, Poland.
[Haranczyk, Maciej] Lawrence Berkeley Natl Lab, Computat Res Div, Berkeley, CA 94720 USA.
[Gutowski, Maciej] Heriot Watt Univ, Chem Sch Engn & Phys Sci, Edinburgh EH14 4AS, Midlothian, Scotland.
[Eustis, Soren N.; Ko, Yeon Jae; Wang, Haopeng; Bowen, Kit H.] Johns Hopkins Univ, Dept Chem, Baltimore, MD 21218 USA.
RP Storoniak, P (reprint author), Univ Gdansk, Dept Chem, Sobieskiego 18, PL-80952 Gdansk, Poland.
RI Eustis, Soren/F-1911-2011; Wang, Haopeng/M-4833-2013; Haranczyk,
Maciej/A-6380-2014
OI Wang, Haopeng/0000-0002-0398-6405; Haranczyk, Maciej/0000-0001-7146-9568
FU Polish Ministry of Science and Higher Education (MNISW) [N N204 023135,
DS/8221-4-0140-10]; U S Department of Energy [DE-AC02-05CH11231]; U S
National Science Foundation [CHR-0809258]
FX This work was supported by (i) the Polish Ministry of Science and Higher
Education (MNISW) under Grant Nos N N204 023135 (J R) and
DS/8221-4-0140-10 (B S), (ii) the U S Department of Energy under
contract DE-AC02-05CH11231 and through a 2008 Seaborg Fellowship at
Lawrence Berkeley National Laboratory (M H), and (iii) the U S National
Science Foundation under Grant No CHR-0809258 (K H B). The calculations
were performed at the Academic Computer Center in Gdansk (TASK)
NR 71
TC 8
Z9 8
U1 0
U2 4
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 SEP 2
PY 2010
VL 114
IS 34
BP 11353
EP 11362
DI 10.1021/jp104668h
PG 10
WC Chemistry, Physical
SC Chemistry
GA 641LU
UT WOS:000281128700045
PM 20701309
ER
PT J
AU Zhang, ZY
Nenoff, TM
Leung, K
Ferreira, SR
Huang, JY
Berry, DT
Provencio, PP
Stumpft, R
AF Zhang, Zhenyuan
Nenoff, Tina M.
Leung, Kevin
Ferreira, Summer R.
Huang, Jian Yu
Berry, Donald T.
Provencio, Paula P.
Stumpft, Roland
TI Room-Temperature Synthesis of Ag-Ni and Pd-Ni Alloy Nanoparticles
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID SOLID INTERACTION TECHNIQUE; TOTAL-ENERGY CALCULATIONS; SILVER-NICKEL
CLUSTERS; ORGANIC FREE-RADICALS; WAVE BASIS-SET; COLLOIDAL SILVER;
AQUEOUS-SOLUTION; BIMETALLIC NANOPARTICLES; FEPT NANOPARTICLES;
ABSORPTION-SPECTRA
AB Ni-based alloy nanoparticles (NPs) are synthesized using room-temperature radiolysis. Density functional theory (DFT) and various nanoscale characterization methods are used to provide a strong basis for understanding and describing metastable phase regimes of alloy NPs whose reaction formation is determined by kinetic rather than thermodynamic reaction processes. Two series of nickel alloyed NPs, Ag-Ni and Pd-Ni, are analyzed and characterized via various analytical characterization techniques. Different ratios of Ag(x)-Ni(1-x) alloy NPs and Pd(0.5)-Ni(0.5) alloy NPs are prepared using a high gamma irradiation dose rate. Images from high-angle annular dark-field show that the Ag-Ni NPs are not in a core-shell configuration but, rather, a homogeneous alloy structure. Energy filtered transmission electron microscopy maps further elucidate the homogeneity of the metals in each alloy NP. Of particular interest are the normally immiscible Ag-Ni NPs that have been shown to form core-shell structures in thermodynamically driven reactions. All evidence supports that homogeneous Ag-Ni and Pd-Ni alloy NPs are successfully synthesized by a high dose rate radiolytic methodology. DFT modeling is used to support that nanoparticle alloying proceeds through the less energetically favorable path of formation, achievable via high dose rate radiolysis.
C1 [Zhang, Zhenyuan; Nenoff, Tina M.; Leung, Kevin; Ferreira, Summer R.; Stumpft, Roland] Sandia Natl Labs, Dept Surface & Interface Sci, Albuquerque, NM 87185 USA.
[Huang, Jian Yu] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA.
[Berry, Donald T.] Sandia Natl Labs, Dept Hot Cells & Gamma Facil, Albuquerque, NM 87185 USA.
[Provencio, Paula P.] Sandia Natl Labs, Dept Radiat Solid Interact, Albuquerque, NM 87185 USA.
RP Nenoff, TM (reprint author), Sandia Natl Labs, Dept Surface & Interface Sci, MS-1415, Albuquerque, NM 87185 USA.
EM tmnenof@sandia.gov
RI Huang, Jianyu/C-5183-2008
FU Sandia National Laboratories; Lockheed Martin Company
FX This work was supported, in part, by the Laboratory Directed Research
and Development (LDRD) program of Sandia National Laboratories. Sandia
National Laboratories is a multiprogram laboratory operated by Sandia
Corporation, a wholly owned subsidiary of Lockheed Martin Company, for
the U.S. Department of Energy's National Nuclear Security
Administration.
NR 67
TC 46
Z9 46
U1 10
U2 98
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 SEP 2
PY 2010
VL 114
IS 34
BP 14309
EP 14318
DI 10.1021/jp911947v
PG 10
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 641LY
UT WOS:000281129100001
ER
PT J
AU Kulkarni, AD
Wang, LL
Johnson, DD
Sholl, DS
Johnson, JK
AF Kulkarni, Anant D.
Wang, Lin-Lin
Johnson, Duane D.
Sholl, David S.
Johnson, J. Karl
TI First-Principles Characterization of Amorphous Phases of MB12H12, M =
Mg, Ca
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID REVERSIBLE HYDROGEN STORAGE; N-H SYSTEM; MOLECULAR-DYNAMICS;
CRYSTAL-STRUCTURES; LIBH4; DECOMPOSITION; MG(BH4)(2); ENERGY; LI;
DESORPTION
AB Complex borohydrides have been studied as candidate materials for vehicular hydrogen storage. In particular, M(BH4)(2), where M = Mg or Ca, has received considerable attention because of its high gravimetric capacity for H-2. Experimental observations indicate an initial decomposition reaction: 6M(BH4)(2) -> 5MH(2) + MB12H12 + 13H(2), where the MB12H12 species are amorphous. We use first-principles density functional theory to study the structural and energetic properties of MB12H12. The purpose of these calculations is to investigate why these materials form amorphous structures. We have identified two possible reasons for MB12H12 adopting apparently amorphous rather than crystalline structures. First, our calculations reveal a large number of structurally distinct polymorphs having near-degenerate energies. We simulate an X-ray diffraction (XRD) pattern for each polymorph and compute the Boltzmann-averaged XRD patterns for MgB12H12, and CaB12H12. These average patterns appear to be amorphous, having very broad peaks. Therefore, we predict that the amorphous MB12H12 materials observed experimentally may be an intimate mixture of a very large number of structurally distinct crystallites. Second, our first-principles molecular dynamics calculations indicate that cations are highly mobile near room temperature; analysis of cation radial distribution functions gives liquid-like rather than solid-like features that could also result in an experimental observation of an amorphous XRD pattern near room temperature.
C1 [Kulkarni, Anant D.; Johnson, J. Karl] Univ Pittsburgh, Dept Chem Engn, Pittsburgh, PA 15261 USA.
[Wang, Lin-Lin; Johnson, Duane D.] Univ Illinois, Urbana, IL 61801 USA.
[Sholl, David S.] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA.
[Johnson, J. Karl] Natl Energy Technol Lab, Pittsburgh, PA 15236 USA.
RP Johnson, JK (reprint author), Univ Pittsburgh, Dept Chem Engn, Pittsburgh, PA 15261 USA.
EM karki@pitt.edu
RI KULKARNI, ANANT/D-3124-2012; Johnson, Karl/E-9733-2013;
OI Johnson, Karl/0000-0002-3608-8003; Johnson, Duane/0000-0003-0794-7283
FU DOE [DE-FC36-05G015066, DE-FC36-05GO15064]
FX This work was supported by the DOE grant nos. DE-FC36-05G015066 and
DE-FC36-05GO15064 and performed in conjunction with the DOE Metal
Hydride Center of Excellence. Calculations were performed at the
University of Pittsburgh's Center for Simulation and Modeling, and the
Materials Computation Center at the University of Illinois.
NR 38
TC 21
Z9 21
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 SEP 2
PY 2010
VL 114
IS 34
BP 14601
EP 14605
DI 10.1021/jp101326g
PG 5
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 641LY
UT WOS:000281129100039
ER
PT J
AU Petrik, NG
Kimmel, GA
AF Petrik, Nikolay G.
Kimmel, Greg A.
TI Off-Normal CO2 Desorption from the Photooxidation of CO on Reduced
TiO2(110)
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID DENSITY-FUNCTIONAL THEORY; RUTILE TIO2(110); OXIDIZED TIO2(110);
MOLECULAR-OXYGEN; SURFACE SCIENCE; OXIDATION; DISSOCIATION;
CHEMISORPTION; PRINCIPLES; PT(111)
AB Photoinduced reactions between O-2 and CO on reduced rutile TiO2(110) are studied at low temperature (similar to 30 K). Photon-stimulated desorption (PSD) of O-2, CO2, and CO is observed with comparable yields. Isotope labeling experiments indicate that O-2 chemisorbed in a vacancy is more active for photooxidation than O-2 chemisorbed on a Ti-5c site. The angular distribution for the desorbing CO2 is peaked at similar to 40 degrees with respect to the surface normal in the [1 (1) over bar0] azimuth (i.e., perpendicular to the bridging oxygen rows), suggesting that CO2 is produced from O-2 occupying an oxygen vacancy and CO adsorbed on a Ti-5c site next to it. The experimental results are consistent with CO2 being produced from a transition state that has been predicted theoretically. The CO PSD from TiO2(110) is enhanced dramatically by the presence of chemisorbed O-2, suggesting that it is a byproduct of the CO photooxidation process.
C1 [Petrik, Nikolay G.; Kimmel, Greg A.] Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
RP Petrik, NG (reprint author), Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
EM nikolai.petrik@pnl.gov; gregory.kimmel@pnl.gov
RI Petrik, Nikolay/G-3267-2015;
OI Petrik, Nikolay/0000-0001-7129-0752; Kimmel, Greg/0000-0003-4447-2440
FU U.S. Department of Energy (DOE), Office of Basic Energy Sciences,
Division of Chemical Sciences, Geosciences, and Biosciences; DOE, Office
of Biological and Environmental Research; DOE [DE-AC06-76RLO 1830]
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. The work was performed at the W. R. Wiley Environmental
Molecular Sciences Laboratory, a national scientific user facility
sponsored by DOE, Office of Biological and Environmental Research, and
located at Pacific Northwest National Laboratory, which is operated for
DOE by Battelle Memorial Institute under Contract DE-AC06-76RLO 1830.
NR 39
TC 29
Z9 29
U1 3
U2 25
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 SEP 2
PY 2010
VL 1
IS 17
BP 2508
EP 2513
DI 10.1021/jz100884w
PG 6
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 646UK
UT WOS:000281568300003
ER
PT J
AU Xu, ZC
Carlton, CE
Allard, LF
Shao-Horn, Y
Hamad-Schifferli, K
AF Xu, Zhichuan
Carlton, Christopher E.
Allard, Lawrence F.
Shao-Horn, Yang
Hamad-Schifferli, Kimberly
TI Direct Colloidal Route for Pt-Covered AuPt Bimetallic Nanoparticles
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID OXYGEN REDUCTION; GOLD NANOPARTICLES; FACILE SYNTHESIS; ALLOY;
ELECTROCATALYSTS; NANOCRYSTALS; CATALYSTS; GROWTH
AB Pt-covered AuPt bimetallic nanoparticles were synthesized in a polar organic environment using HAuCl(4) and H(2)PtCl(6) as precursors. Electrochemical and UV-vis measurements showed that these AuPt nanoparticles have Pt-rich Surfaces and their effective electrochemical Pt coverage is dependent on the Pt nominal composition. By mixing the two precursors in one pot, the interaction of two precursors lowered the temperature for Pt reduction and further favored the formation of a smooth Pt shell on the particle surface. The synthesis is a,unique approach for controlling the surface electrochemical properties of bimetallic nanoparticles via varying particle nominal compositions.
C1 [Xu, Zhichuan; Carlton, Christopher E.; Shao-Horn, Yang; Hamad-Schifferli, Kimberly] MIT, Dept Mech Engn, Cambridge, MA 02139 USA.
[Hamad-Schifferli, Kimberly] MIT, Dept Biol Engn, Cambridge, MA 02139 USA.
[Allard, Lawrence F.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
RP Shao-Horn, Y (reprint author), MIT, Dept Mech Engn, Cambridge, MA 02139 USA.
EM shaohorn@mit.edu; schiffer@mit.edu
RI Xu, Zhichuan/D-1661-2013
OI Xu, Zhichuan/0000-0001-7746-5920
FU National Science Foundation [DMR-0819762]; U. S. Department of Energy,
Office of Energy Efficiency and Renewable Energy
FX This work was supported by the MRSEC Program of the National Science
Foundation under Award Number DMR-0819762. The authors thank S. Chen for
TEM/EDS, W. Sheng and J. Kim for fruitful discussion, H. A. Gasteiger
and J. Suntivich for establishing the electrochemical method to estimate
surface Pt coverage of AuPt NPs. This 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 27
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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 SEP 2
PY 2010
VL 1
IS 17
BP 2514
EP 2518
DI 10.1021/jz100896p
PG 5
WC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary; Physics, Atomic, Molecular & Chemical
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 646UK
UT WOS:000281568300004
ER
PT J
AU Muller, H
Peters, A
Chu, S
AF Mueller, Holger
Peters, Achim
Chu, Steven
TI Atom gravimeters and gravitational redshift Reply
SO NATURE
LA English
DT Letter
C1 [Mueller, Holger; Chu, Steven] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Mueller, Holger; Chu, Steven] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
[Peters, Achim] Humboldt Univ, Inst Phys, D-10117 Berlin, Germany.
[Chu, Steven] US DOE, Washington, DC 20585 USA.
RP Muller, H (reprint author), Univ Calif Berkeley, Dept Phys, 151 Le Conte Hall,MS 7300, Berkeley, CA 94720 USA.
EM hm@berkeley.edu
RI Peters, Achim/G-3742-2010; Mueller, Holger/E-3194-2015
NR 13
TC 24
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U1 0
U2 12
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 0028-0836
J9 NATURE
JI Nature
PD SEP 2
PY 2010
VL 467
IS 7311
BP E2
EP E2
DI 10.1038/nature09341
PG 1
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 645MB
UT WOS:000281461200029
ER
PT J
AU Abe, E
Tyryshkin, AM
Tojo, S
Morton, JJL
Witzel, WM
Fujimoto, A
Ager, JW
Haller, EE
Isoya, J
Lyon, SA
Thewalt, MLW
Itoh, KM
AF Abe, Eisuke
Tyryshkin, Alexei M.
Tojo, Shinichi
Morton, John J. L.
Witzel, Wayne M.
Fujimoto, Akira
Ager, Joel W.
Haller, Eugene E.
Isoya, Junichi
Lyon, Stephen A.
Thewalt, Mike L. W.
Itoh, Kohei M.
TI Electron spin coherence of phosphorus donors in silicon: Effect of
environmental nuclei
SO PHYSICAL REVIEW B
LA English
DT Article
ID SEMICONDUCTORS
AB We report electron paramagnetic resonance (EPR) experiments of phosphorus donors in isotopically controlled silicon single crystals. By varying the concentration of the (29)Si isotope, f, from 0.075% to 99.2%, we systematically study the effect of the environmental nuclear spins on the donor-electron spin. We find excellent agreement between experiment and theory for decoherence times due to nuclear-induced spectral diffusion, clarifying that the nuclear-induced decoherence is dominant in the range of f studied. We also observe that the EPR linewidth shows a transition from the square-root dependence to the linear dependence on f, in agreement with theoretical predictions.
C1 [Abe, Eisuke; Morton, John J. L.] Univ Oxford, Dept Mat, Oxford OX1 3PH, England.
[Abe, Eisuke; Tojo, Shinichi; Fujimoto, Akira; Itoh, Kohei M.] Keio Univ, Sch Fundamental Sci & Technol, Tokyo 2238522, Japan.
[Tyryshkin, Alexei M.; Lyon, Stephen A.] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA.
[Morton, John J. L.] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England.
[Witzel, Wayne M.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Ager, Joel W.; Haller, Eugene E.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Haller, Eugene E.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
[Isoya, Junichi] Univ Tsukuba, Grad Sch Lib Informat & Media Studies, Tsukuba, Ibaraki 3058550, Japan.
[Thewalt, Mike L. W.] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada.
RP Abe, E (reprint author), Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England.
EM eisuke.abe@materials.ox.ac.uk
RI Abe, Eisuke/C-1113-2009; Morton, John/I-3515-2013; Itoh,
Kohei/C-5738-2014;
OI Ager, Joel/0000-0001-9334-9751
FU Royal Society; NSF through the Princeton MRSEC [DMR-0213706]; NAS/LPS
through LBNL [MOD 713106A]; MEXT; Special Coordination Funds for
Promoting Science and Technology; JST-EPSRC; Funding Program for Science
and Technology FIRST; Global Center of Excellence at Keio University;
U.S. Department of Energy's National Nuclear Security Administration
[DE-AC04-94AL85000]; Office of Science, Office of Basic Energy Sciences,
Materials Sciences and Engineering Division of the U.S. Department of
Energy [DE-AC02-05CH11231]
FX We thank H.-J. Pohl for the purified 29Si source and A.
Takano for SIMS measurements of several samples. J.J.L.M. was supported
by the Royal Society. Work at Princeton was supported by the NSF through
the Princeton MRSEC under Grant No. DMR-0213706 and by the NAS/LPS
through LBNL under Grant No. MOD 713106A. Work at Keio was supported in
part by the Grant-in-Aid for Scientific Research by MEXT, in part by
Special Coordination Funds for Promoting Science and Technology, in part
by JST-EPSRC Strategic International Cooperative Program, in part by the
Funding Program for Science and Technology FIRST, and in part by the
Global Center of Excellence at Keio University. Sandia National
Laboratories is a multiprogram laboratory operated by Sandia
Corporation, a wholly owned subsidiary of Lockheed Martin company, for
the U.S. Department of Energy's National Nuclear Security Administration
under Contract No. DE-AC04-94AL85000. Work at Lawrence Berkeley National
Laboratory 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 under Contract No. DE-AC02-05CH11231.
NR 20
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U1 1
U2 22
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 SEP 2
PY 2010
VL 82
IS 12
AR 121201
DI 10.1103/PhysRevB.82.121201
PG 4
WC Physics, Condensed Matter
SC Physics
GA 645SM
UT WOS:000281486400001
ER
PT J
AU Johnson, CA
Kittilstved, KR
Kaspar, TC
Droubay, TC
Chambers, SA
Salley, GM
Gamelin, DR
AF Johnson, Claire A.
Kittilstved, Kevin R.
Kaspar, Tiffany C.
Droubay, Tim C.
Chambers, Scott A.
Salley, G. Mackay
Gamelin, Daniel R.
TI Mid-gap electronic states in Zn1-xMnxO
SO PHYSICAL REVIEW B
LA English
DT Article
ID DILUTED MAGNETIC SEMICONDUCTORS; MN-DOPED ZNO; QUANTUM DOTS; ZINC-OXIDE;
THIN-FILMS; MAGNETOOPTICAL PROPERTIES; PARAMAGNETIC RESONANCE;
EXCITED-STATE; NANOCRYSTALS; SPECTRA
AB Electronic absorption, magnetic circular dichroism (MCD), photoconductivity, and valence-band x-ray photoelectron (XPS) spectroscopic measurements were performed on epitaxial Zn1-xMnxO films to investigate the origin of the mid-gap band that appears upon introduction of Mn2+ into the ZnO lattice. Absorption and MCD spectroscopies reveal Mn2+-related intensity at energies below the first excitonic transition of ZnO, tailing well into the visible energy region, with an onset at similar to 2.2 eV. Photoconductivity measurements show that excitation into this visible band generates mobile charge carriers, consistent with assignment as a Mn2+/3+ photoionization transition. XPS measurements reveal the presence of occupied Mn2+ levels just above the valence-band edge, supporting this assignment. MCD measurements additionally show a change in sign and large increase in magnitude of the excitonic Zeeman splitting in Zn1-xMnxO relative to ZnO, suggesting that sp-d exchange in Zn1-xMnxO is not as qualitatively different from those in other II-VI diluted magnetic semiconductors as has been suggested. The singular electronic structure feature of Zn1-xMnxO is the presence of this Mn2+/3+ ionization level within the gap, and the influence of this level on other physical properties of Zn1-xMnxO is discussed.
C1 [Johnson, Claire A.; Kittilstved, Kevin R.; Salley, G. Mackay; Gamelin, Daniel R.] Univ Washington, Dept Chem, Seattle, WA 98195 USA.
[Kaspar, Tiffany C.; Droubay, Tim C.; Chambers, Scott A.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Salley, G. Mackay] Wofford Coll, Dept Phys, Spartanburg, SC 29303 USA.
RP Johnson, CA (reprint author), Univ Washington, Dept Chem, Seattle, WA 98195 USA.
EM gamelin@chem.washington.edu
RI Droubay, Tim/D-5395-2016; Kittilstved, Kevin/B-8204-2009
OI Droubay, Tim/0000-0002-8821-0322;
FU U.S. National Science Foundation [CHE 0628252-CRC]; Sloan Foundation;
Department of Energy's Office of Biological and Environmental Research
located at Pacific Northwest National Laboratory; U.S. Department of
Energy, Office of Science, Office of Basic Energy Sciences, Division of
Materials Science and Engineering Physics
FX This work was supported by the U.S. National Science Foundation (Grant
No. CHE 0628252-CRC). Additional support to D. G. from the Sloan
Foundation is gratefully acknowledged. A portion of the research was
performed using EMSL, a national scientific user facility sponsored by
the Department of Energy's Office of Biological and Environmental
Research located at Pacific Northwest National Laboratory. Work
performed at EMSL was supported by the U.S. Department of Energy, Office
of Science, Office of Basic Energy Sciences, Division of Materials
Science and Engineering Physics. We thank Chongmin Wang (EMSL) for the
TEM measurements.
NR 67
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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 SEP 2
PY 2010
VL 82
IS 11
AR 115202
DI 10.1103/PhysRevB.82.115202
PG 11
WC Physics, Condensed Matter
SC Physics
GA 645SL
UT WOS:000281486200006
ER
PT J
AU Rondinelli, JM
Spaldin, NA
AF Rondinelli, James M.
Spaldin, Nicola A.
TI Substrate coherency driven octahedral rotations in perovskite oxide
films
SO PHYSICAL REVIEW B
LA English
DT Article
ID PHASE-TRANSITION; SRTIO3
AB We perform first-principles density-functional calculations to explore the role of substrate proximity effects on the octahedral rotation patterns in perovskite oxide superlattices. With cubic perovskite SrFeO(3) as our model film and tetragonal SrTiO(3) as the substrate, we show that in most cases the substrate octahedral rotation patterns propagate into the film across the heterointerface. We also identify elastic boundary conditions for which the enforced structural coherence induces atomic displacement patterns that are not found in the bulk phase diagram of either individual constituent. We suggest that such substrate coherency-induced octahedral texturing of thin film oxides is a promising approach for tuning the electronic structure of functional oxide thin films.
C1 [Rondinelli, James M.; Spaldin, Nicola A.] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA.
RP Rondinelli, JM (reprint author), Argonne Natl Lab, Xray Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM rondinelli@anl.gov
RI Rondinelli, James/A-2071-2009; Spaldin, Nicola/A-1017-2010
OI Rondinelli, James/0000-0003-0508-2175; Spaldin,
Nicola/0000-0003-0709-9499
FU NDSEG-DoD; NSF [DMR 0940420]
FX This work was supported by NDSEG-DoD (J.M.R.) and the NSF through Grant
No. DMR 0940420 (N.A.S.). We thank S. May, C. Adamo, and D. Schlom for
useful discussions.
NR 29
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U2 60
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 SEP 2
PY 2010
VL 82
IS 11
AR 113402
DI 10.1103/PhysRevB.82.113402
PG 4
WC Physics, Condensed Matter
SC Physics
GA 645SL
UT WOS:000281486200003
ER
PT J
AU Wang, CH
Lawrence, JM
Bauer, ED
Kothapalli, K
Gardner, JS
Ronning, F
Gofryk, K
Thompson, JD
Nakotte, H
Trouw, F
AF Wang, C. H.
Lawrence, J. M.
Bauer, E. D.
Kothapalli, K.
Gardner, J. S.
Ronning, F.
Gofryk, K.
Thompson, J. D.
Nakotte, H.
Trouw, F.
TI Unusual signatures of the ferromagnetic transition in the heavy fermion
compound UMn2Al20
SO PHYSICAL REVIEW B
LA English
DT Article
ID PR3TL; RESISTIVITY
AB Magnetic-susceptibility results for single crystals of the new cubic compounds UT2Al20 (T = Mn, V, and Mo) are reported. Magnetization, specific-heat, resistivity, and neutron-diffraction results for a single crystal and neutron diffraction and inelastic spectra for a powder sample are reported for UMn2Al20. For T = V and Mo, temperature-independent Pauli paramagnetism is observed. For UMn2Al20, a ferromagnetic transition is observed in the magnetic susceptibility at T-c = 20 K. The specific-heat anomaly at T-c is very weak while no anomaly in the resistivity is seen at T-c. We discuss two possible origins for this behavior of UMn2Al20: moderately small moment itinerant ferromagnetism or induced local-moment ferromagnetism.
C1 [Wang, C. H.; Lawrence, J. M.] Univ Calif Irvine, Irvine, CA 92697 USA.
[Wang, C. H.; Bauer, E. D.; Ronning, F.; Gofryk, K.; Thompson, J. D.; Trouw, F.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Wang, C. H.] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA.
[Kothapalli, K.; Nakotte, H.] New Mexico State Univ, Dept Phys, Las Cruces, NM 88003 USA.
[Gardner, J. S.] NIST, NCNR, Gaithersburg, MD 20899 USA.
[Gardner, J. S.] Indiana Univ, Bloomington, IN 47408 USA.
RP Wang, CH (reprint author), Univ Calif Irvine, Irvine, CA 92697 USA.
RI Bauer, Eric/D-7212-2011; Lujan Center, LANL/G-4896-2012; Gardner,
Jason/A-1532-2013; Gofryk, Krzysztof/F-8755-2014;
OI Gofryk, Krzysztof/0000-0002-8681-6857; Ronning,
Filip/0000-0002-2679-7957; Bauer, Eric/0000-0003-0017-1937
FU U.S. Department of Energy, Office of Basic Energy Sciences, Division of
Materials Sciences and Engineering [DE-FG02-03ER46036]; U.S. DOE/Office
of Science; Oak Ridge National Laboratory; National Institute of
Standards and Technology, U.S. Department of Commerce; National Science
Foundation [DMR 0804032]
FX Research at UC Irvine was supported by the U.S. Department of Energy,
Office of Basic Energy Sciences, Division of Materials Sciences and
Engineering under Award No. DE-FG02-03ER46036. Work at Los Alamos
National Laboratory was performed under the auspices of the U.S.
DOE/Office of Science. Work at ORNL was sponsored by the Laboratory
Directed Research and Development Program of Oak Ridge National
Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of
Energy. We acknowledge the support of the National Institute of
Standards and Technology, U.S. Department of Commerce, in providing the
neutron research facilities used in this work. Part of the work was
supported by the National Science Foundation under Grant No. DMR
0804032.
NR 20
TC 10
Z9 10
U1 0
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 SEP 2
PY 2010
VL 82
IS 9
AR 094406
DI 10.1103/PhysRevB.82.094406
PG 5
WC Physics, Condensed Matter
SC Physics
GA 645SJ
UT WOS:000281486000005
ER
PT J
AU Klahn, T
Roberts, CD
Chang, L
Chen, HA
Liu, YX
AF Klaehn, Thomas
Roberts, Craig D.
Chang, Lei
Chen, Huan
Liu, Yu-Xin
TI Cold quarks in medium: An equation of state
SO PHYSICAL REVIEW C
LA English
DT Article
ID DYSON-SCHWINGER EQUATIONS; LADDER APPROXIMATION; DENSITY; THEOREM;
MATTER; STARS; QCD
AB We derive a compact, semialgebraic expression for the cold-quark-matter equation of state (EoS) in a covariant model that exhibits coincident deconfinement and chiral symmetry restoring transitions in medium. In doing so we obtain algebraic expressions for the number- and scalar-density distributions in both the confining Nambu and the deconfined Wigner phases and the vacuum-pressure difference between these phases, which defines a bag constant. Our qualitative study illustrates that a confining interaction can materially alter distribution functions from those of a Fermi gas and impact significantly on a system's thermodynamic properties, possibilities that are apparent in the EoS.
C1 [Klaehn, Thomas; Roberts, Craig D.] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
[Klaehn, Thomas] Uniwersytet Wroclawski, Inst Fizyki Teoretycznej, PL-50204 Wroclaw, Poland.
[Roberts, Craig D.; Liu, Yu-Xin] Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
[Chang, Lei] Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China.
[Chen, Huan] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
[Liu, Yu-Xin] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China.
[Liu, Yu-Xin] Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China.
RP Klahn, T (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
EM cdroberts@anl.gov
OI Roberts, Craig/0000-0002-2937-1361
FU Department of Energy, Office of Nuclear Physics [DE-AC02-06CH11357];
National Natural Science Foundation of China [10425521, 10675007,
10705002, 10935001]; Major State Basic Research Development Program
[G2007CB815000]
FX This work was supported by Department of Energy, Office of Nuclear
Physics, Contract No. DE-AC02-06CH11357; National Natural Science
Foundation of China Contract Nos. 10425521, 10675007, 10705002, and
10935001; and Major State Basic Research Development Program Contract
No. G2007CB815000.
NR 32
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U1 0
U2 2
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 SEP 2
PY 2010
VL 82
IS 3
AR 035801
DI 10.1103/PhysRevC.82.035801
PG 5
WC Physics, Nuclear
SC Physics
GA 645SN
UT WOS:000281486500002
ER
PT J
AU Poppitz, E
Unsal, M
AF Poppitz, Erich
Uensal, Mithat
TI Anti-de Sitter-space/conformal-field-theory correspondence and large-N
volume independence
SO PHYSICAL REVIEW D
LA English
DT Article
ID LATTICE GAUGE-THEORY; EGUCHI-KAWAI MODEL; STRING THEORY; TRANSITION;
FREEDOM; PHASE; LIMIT
AB We study the Eguchi-Kawai reduction in the strong-coupling domain of gauge theories via the gravity dual of N = 4 super-Yang-Mills on R(3) x S(1). We show that D-branes geometrize volume independence in the center-symmetric vacuum and give supergravity predictions for the range of validity of reduced large-N models at strong coupling.
C1 [Poppitz, Erich] Univ Toronto, Dept Phys, Toronto, ON M4Y 3B6, Canada.
[Uensal, Mithat] Stanford Univ, SLAC, Stanford, CA 94025 USA.
[Uensal, Mithat] Stanford Univ, Dept Phys, Stanford, CA 94025 USA.
RP Poppitz, E (reprint author), Univ Toronto, Dept Phys, Toronto, ON M4Y 3B6, Canada.
FU U.S. Department of Energy [DE-AC02-76SF00515]; National Science and
Engineering Council of Canada (NSERC)
FX We are indebted to J. Maldacena, O. Aharony, and L. Yaffe for their
crucial help. We also thank B. Burrington, M. Hanada, A. Karch, H.
Neuberger, A. Peet, A. Rajaraman, S. Shenker, and E. Witten for useful
discussions. M. U. thanks the Weizmann Institute of Science, where
portions of this work was done, for hospitality. This work was supported
by the U.S. Department of Energy Grant No. DE-AC02-76SF00515 and by the
National Science and Engineering Council of Canada (NSERC).
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 1550-7998
J9 PHYS REV D
JI Phys. Rev. D
PD SEP 2
PY 2010
VL 82
IS 6
AR 066002
DI 10.1103/PhysRevD.82.066002
PG 5
WC Astronomy & Astrophysics; Physics, Particles & Fields
SC Astronomy & Astrophysics; Physics
GA 645SP
UT WOS:000281486700004
ER
PT J
AU Slifer, K
Rondon, OA
Aghalaryan, A
Ahmidouch, A
Asaturyan, R
Bloch, F
Boeglin, W
Bosted, P
Carasco, C
Carlini, R
Cha, J
Chen, JP
Christy, ME
Cole, L
Coman, L
Crabb, D
Danagoulian, S
Day, D
Dunne, J
Elaasar, M
Ent, R
Fenker, H
Frlez, E
Gaskell, D
Gan, L
Gomez, J
Hu, B
Jourdan, J
Jones, MK
Keith, C
Keppel, CE
Khandaker, M
Klein, A
Kramer, L
Liang, Y
Lichtenstadt, J
Lindgren, R
Mack, D
Mckee, P
McNulty, D
Meekins, D
Mkrtchyan, H
Nasseripour, R
Niculescu, I
Normand, K
Norum, B
Pocanic, D
Prok, Y
Raue, B
Reinhold, J
Roche, J
Kiselev, D
Savvinov, N
Sawatzky, B
Seely, M
Sick, I
Smith, C
Smith, G
Stepanyan, S
Tang, L
Tajima, S
Testa, G
Vulcan, W
Wang, K
Warren, G
Wesselmann, FR
Wood, S
Yan, C
Yuan, L
Yun, J
Zeier, M
Zhu, H
AF Slifer, K.
Rondon, O. A.
Aghalaryan, A.
Ahmidouch, A.
Asaturyan, R.
Bloch, F.
Boeglin, W.
Bosted, P.
Carasco, C.
Carlini, R.
Cha, J.
Chen, J. P.
Christy, M. E.
Cole, L.
Coman, L.
Crabb, D.
Danagoulian, S.
Day, D.
Dunne, J.
Elaasar, M.
Ent, R.
Fenker, H.
Frlez, E.
Gaskell, D.
Gan, L.
Gomez, J.
Hu, B.
Jourdan, J.
Jones, M. K.
Keith, C.
Keppel, C. E.
Khandaker, M.
Klein, A.
Kramer, L.
Liang, Y.
Lichtenstadt, J.
Lindgren, R.
Mack, D.
Mckee, P.
McNulty, D.
Meekins, D.
Mkrtchyan, H.
Nasseripour, R.
Niculescu, I.
Normand, K.
Norum, B.
Pocanic, D.
Prok, Y.
Raue, B.
Reinhold, J.
Roche, J.
Kiselev, D.
Savvinov, N.
Sawatzky, B.
Seely, M.
Sick, I.
Smith, C.
Smith, G.
Stepanyan, S.
Tang, L.
Tajima, S.
Testa, G.
Vulcan, W.
Wang, K.
Warren, G.
Wesselmann, F. R.
Wood, S.
Yan, C.
Yuan, L.
Yun, J.
Zeier, M.
Zhu, H.
TI Probing Quark-Gluon Interactions with Transverse Polarized Scattering
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID DEEP-INELASTIC-SCATTERING; SPIN STRUCTURE-FUNCTION; STRUCTURE FUNCTIONS
G(1)(P); SUM-RULES; RESONANCE REGION; TARGET; QCD; NEUTRON;
ELECTROPRODUCTION; OPERATORS
AB We have extracted QCD matrix elements from our data on doubly polarized inelastic scattering of electrons on nuclei. We find the higher twist matrix element (d) over tilde (2), which arises strictly from quark-gluon interactions, to be unambiguously nonzero. The data also reveal an isospin dependence of higher twist effects if we assume that the Burkhardt-Cottingham sum rule is valid. The fundamental Bjorken sum rule obtained from the a(0) matrix element is satisfied at our low momentum transfer.
C1 [Slifer, K.; Rondon, O. A.; Crabb, D.; Day, D.; Frlez, E.; Lindgren, R.; Mckee, P.; McNulty, D.; Norum, B.; Pocanic, D.; Prok, Y.; Sawatzky, B.; Smith, C.; Tajima, S.; Wang, K.; Wesselmann, F. R.; Zeier, M.; Zhu, H.] Univ Virginia, Charlottesville, VA 22903 USA.
[Slifer, K.] Univ New Hampshire, Durham, NH 03824 USA.
[Aghalaryan, A.; Asaturyan, R.; Mkrtchyan, H.] Yerevan Phys Inst, Yerevan 0036, Armenia.
[Ahmidouch, A.; Danagoulian, S.] N Carolina Agr & Tech State Univ, Greensboro, NC 27411 USA.
[Bloch, F.; Carasco, C.; Jourdan, J.; Normand, K.; Kiselev, D.; Sick, I.; Testa, G.; Warren, G.] Univ Basel, CH-4056 Basel, Switzerland.
[Boeglin, W.; Coman, L.; Kramer, L.; Nasseripour, R.; Raue, B.; Reinhold, J.] Florida Int Univ, Miami, FL 33199 USA.
[Bosted, P.; Carlini, R.; Chen, J. P.; Ent, R.; Fenker, H.; Gaskell, D.; Gomez, J.; Jones, M. K.; Keith, C.; Mack, D.; Meekins, D.; Niculescu, I.; Roche, J.; Seely, M.; Smith, G.; Vulcan, W.; Warren, G.; Wood, S.; Yan, C.] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
[Cha, J.; Dunne, J.] Mississippi State Univ, Mississippi State, MS 39762 USA.
[Christy, M. E.; Cole, L.; Hu, B.; Keppel, C. E.; Liang, Y.; Tang, L.; Yuan, L.] Hampton Univ, Hampton, VA 23668 USA.
[Elaasar, M.] So Univ New Orleans, New Orleans, LA 70126 USA.
[Gan, L.] Univ N Carolina, Wilmington, NC 28403 USA.
[Khandaker, M.; Wesselmann, F. R.] Norfolk State Univ, Norfolk, VA 23504 USA.
[Klein, A.] Old Dominion Univ, Norfolk, VA 23529 USA.
[Lichtenstadt, J.] Tel Aviv Univ, IL-69978 Tel Aviv, Israel.
[McNulty, D.] Univ Massachusetts, Amherst, MA 01003 USA.
[Kiselev, D.] Paul Scherrer Inst, Villigen, Switzerland.
[Savvinov, N.] Univ Maryland, College Pk, MD 20742 USA.
[Stepanyan, S.] Kyungpook Natl Univ, Taegu 702701, South Korea.
[Yun, J.] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA.
RP Slifer, K (reprint author), Univ Virginia, Charlottesville, VA 22903 USA.
RI Rondon Aramayo, Oscar/B-5880-2013; Frlez, Emil/B-6487-2013; carasco,
Cedric/H-5463-2013; Day, Donal/C-5020-2015
OI Day, Donal/0000-0001-7126-8934
FU Department of Energy [DE-AC05-84ER40150]; National Science Foundation;
Schweizerische Nationalfonds; Institute of Nuclear and Particle Physics
of the University of Virginia
FX We would like to thank the Hall C technical staff and the accelerator
operators for their efforts and dedication. This work was supported by
the Department of Energy, the National Science Foundation, the
Schweizerische Nationalfonds, and by the Institute of Nuclear and
Particle Physics of the University of Virginia. The Southeastern
Universities Research Association operates the Thomas Jefferson National
Accelerator Facility for the DOE under Contract No. DE-AC05-84ER40150,
mod. # 175.
NR 48
TC 11
Z9 11
U1 0
U2 3
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
EI 1079-7114
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD SEP 2
PY 2010
VL 105
IS 10
AR 101601
DI 10.1103/PhysRevLett.105.101601
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 645SQ
UT WOS:000281486900006
PM 20867509
ER
PT J
AU Yin, WG
Lee, CC
Ku, W
AF Yin, Wei-Guo
Lee, Chi-Cheng
Ku, Wei
TI Unified Picture for Magnetic Correlations in Iron-Based Superconductors
SO PHYSICAL REVIEW LETTERS
LA English
DT Article
ID ELECTRONIC-STRUCTURE; BA0.6K0.4FE2AS2; ORDER
AB The varying metallic antiferromagnetic correlations observed in iron-based superconductors are unified in a model consisting of both itinerant electrons and localized spins. The decisive factor is found to be the sensitive competition between the superexchange antiferromagnetism and the orbital-degenerate double-exchange ferromagnetism. Our results reveal the crucial role of Hund's rule coupling for the strongly correlated nature of the system and suggest that the iron-based superconductors are closer kin to manganites than cuprates in terms of their diverse magnetism and incoherent normal-state electron transport. This unified picture would be instrumental for exploring other exotic properties and the mechanism of superconductivity in this new class of superconductors.
C1 [Yin, Wei-Guo; Lee, Chi-Cheng; Ku, Wei] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
RP Yin, WG (reprint author), Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA.
EM wyin@bnl.gov
RI Yin, Weiguo/A-9671-2014
OI Yin, Weiguo/0000-0002-4965-5329
FU U.S. Department of Energy (DOE), Office of Basic Energy Science
[DE-AC02-98CH10886]; DOE CMSN
FX We thank E. Dagotto, G. Gu, J. Hill, C. C. Homes, P. D. Johnson, Q. Li,
P. B. Littlewood, C. Petrovic, M. Strongin, J. M. Tranquada, A. M.
Tsvelik, G. Xu, and I. Zaliznyak for discussions. This work was
supported by the U.S. Department of Energy (DOE), Office of Basic Energy
Science, under Contract No. DE-AC02-98CH10886, and DOE CMSN.
NR 33
TC 119
Z9 119
U1 2
U2 20
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 0031-9007
EI 1079-7114
J9 PHYS REV LETT
JI Phys. Rev. Lett.
PD SEP 2
PY 2010
VL 105
IS 10
AR 107004
DI 10.1103/PhysRevLett.105.107004
PG 4
WC Physics, Multidisciplinary
SC Physics
GA 645SQ
UT WOS:000281486900010
PM 20867542
ER
PT J
AU Zhang, ZF
Khaleel, R
AF Zhang, Z. Fred
Khaleel, Raziuddin
TI Simulating field-scale moisture flow using a combined power-averaging
and tensorial connectivity-tortuosity approach
SO WATER RESOURCES RESEARCH
LA English
DT Article
ID UNSATURATED HYDRAULIC CONDUCTIVITY; STATE-DEPENDENT ANISOTROPY;
HETEROGENEOUS SOILS; STOCHASTIC-ANALYSIS; POROUS-MEDIA; SATURATION;
TRANSPORT; SANDS; WATER; INFILTRATION
AB Various methods have been developed over the past 3 decades to estimate effective unsaturated hydraulic properties. We developed an alternative practical approach to estimate three-dimensional effective unsaturated hydraulic conductivity via a combined power-averaging and tensorial connectivity-tortuosity (PA-TCT) model. An application of the PA-TCT model to data collected at a field injection site suggests that the model provides a reasonable framework for upscaling core-scale measurements as well as an accurate simulation of moisture flow in a heterogeneous vadose zone. The heterogeneous media at the injection site are composed of multiple geologic units, each of which is represented by an anisotropic equivalent homogeneous medium (EHM). The directional effective hydraulic conductivity for each anisotropic EHM was determined by upscaling the laboratory-measured hydraulic properties with the combined PA-TCT approach. A larger difference between the power values in the horizontal and vertical directions indicates a larger macroscopic anisotropy in unsaturated hydraulic conductivity. A moment analysis was used to quantify the center of mass and the spread of the injected water. Numerical simulations showed that, if the flow domain was treated as being isotropic, the vertical migration was significantly overestimated while the lateral movement was underestimated. To the contrary, if the media were treated as layered, the lateral moisture movement was considerably overestimated while the vertical movement was underestimated. However, when the flow domain was modeled as being mildly anisotropic with the PA-TCT-based parameters, the model could successfully predict the moisture flow and the simulated plume matched best the center of mass and the spread of the injected water of the observed moisture plume.
C1 [Zhang, Z. Fred] Pacific NW Natl Lab, Hydrol Grp, Richland, WA 99352 USA.
[Khaleel, Raziuddin] Fluor Govt Grp, Richland, WA 99354 USA.
RP Zhang, ZF (reprint author), Pacific NW Natl Lab, Hydrol Grp, MSIN K9-33,POB 999,902 Battelle Blvd, Richland, WA 99352 USA.
EM fred.zhang@pnl.gov
OI Zhang, Fred/0000-0001-8676-6426
FU Fluor Hanford, Inc.; CH2M Hill Plateau Remediation Company
FX Funding for this research was provided by Fluor Hanford, Inc., and the
CH2M Hill Plateau Remediation Company. Pacific Northwest National
Laboratory is operated by Battelle for the U. S. Department of Energy
under contract DE-AC05-76RL01830. Many thanks are extended to Ming Ye
(University of Florida, Tallahassee) and anonymous reviewers who
provided constructive suggestions. 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 U. S. government or any
agency thereof or its contractors or subcontractors. The views and
opinions of the authors do not necessarily state or reflect those of the
U. S. government or any agency thereof.
NR 48
TC 1
Z9 1
U1 0
U2 4
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0043-1397
J9 WATER RESOUR RES
JI Water Resour. Res.
PD SEP 2
PY 2010
VL 46
AR W09505
DI 10.1029/2009WR008595
PG 14
WC Environmental Sciences; Limnology; Water Resources
SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water
Resources
GA 647QV
UT WOS:000281634600003
ER
PT J
AU Eroglu, A
AF Eroglu, Abdullah
TI Stepped Impedance Resonators in Triple Band Bandpass Filter Design for
Wireless Communication Systems
SO INTERNATIONAL REVIEW OF ELECTRICAL ENGINEERING-IREE
LA English
DT Article
DE Bandpass; Resonators; Sirs; Microstrip; Filter; Communication; Wireless
ID WLAN
AB Triple band microstrip tri-section bandpass filter using stepped impedance resonators (SIRs) is designed, simulated, built, and measured using hair pin structure. The complete design procedure is given from analytical stage to implementation stage with details The coupling between SIRs is investigated for the first time in detail by studying their effect on the filter characteristics including bandwidth, and attenuation to optimize the filter perfomance. The simulation of the filler is performed using method of moment based 2.5D planar electromagnetic simulator The filter is then implemented on RO4003 material and measured The simulation, and measured results are compared and found to be my close. The effect of coupling on the filter performance is then investigated using electromagnetic simulator It is shown that the coupling effect between SIRs can be used as a design knob to obtain a bandpass Idler with a better performance jar the desired frequency band using the proposed filter topology The results of this work can used in wireless communication systems where multiple frequency bandy are needed Copyright (C) 2010 Praise Worthy Prize S.r.l. - All rights reserved
C1 [Eroglu, Abdullah] Indiana Univ Purdue Univ Ft Wayne IPFW, Dept Engn, Ft Wayne, IN USA.
Oak Ridge Natl Lab, Fus Energy Div, Oak Ridge, TN USA.
NR 12
TC 0
Z9 0
U1 0
U2 0
PU PRAISE WORTHY PRIZE SRL
PI NAPOLI
PA PIAZZA G D ANNUNZIO, NAPOLI, 15-I80125, ITALY
SN 1827-6660
J9 INT REV ELECTR ENG-I
JI Int. Rev. Electr. Eng.-IREE
PD SEP-OCT
PY 2010
VL 5
IS 5
BP 2494
EP 2499
PN B
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA 701YF
UT WOS:000285860400042
ER
PT J
AU Watrous, MG
Delmore, JE
Stone, ML
AF Watrous, Matthew G.
Delmore, James E.
Stone, Mark L.
TI Porous ion emitters-A new type of thermal ion emitter
SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
LA English
DT Article
DE Uranium; TIMS; Porous ion emitter
ID IONIZATION MASS-SPECTROMETRY; ISOTOPIC ANALYSIS; PLUTONIUM; URANIUM
AB A new type of porous refractory material has been developed as a thermal ionization emitter that is an improvement over both direct filament and resin bead loading. The porous ion emitter is sintered onto the center of a conventional thermal ionization filament and an aqueous solution containing the sample wicked into this emitter. Application of the porous ion emitter to uranium is demonstrated to provide a utilization efficiency ranging between 1% and 2% across a sample size range of 0 2-10 pg. better than that achieved from resin beads and much better than that achieved with direct loading onto a filament. The technique improves sensitivity and reduces the chance of losing a high value sample when manipulating a single resin bead containing an entire sample. (C) 2010 Elsevier B V All rights reserved.
C1 [Watrous, Matthew G.; Delmore, James E.; Stone, Mark L.] Idaho Natl Lab, Idaho Falls, ID 83415 USA.
RP Watrous, MG (reprint author), Idaho Natl Lab, POB 1625, Idaho Falls, ID 83415 USA.
FU U.S. Government under DOE [DE-AC07-05ID14517]
FX The submitted manuscript has been authored by a contractor of the U.S.
Government under DOE Contract DE-AC07-05ID14517. Accordingly, the U.S.
Government retains a nonexclusive, royalty-free license to publish or
reproduce the published form of this contribution, or allow others to do
so, for U.S. Government purposes. This information was prepared as an
account of work sponsored by an agency of the U.S. Government. Neither
the U.S. Government nor any agency thereof, nor any of their employees,
makes any warranty, express 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. References
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
U.S. Government or any agency thereof. The views and opinions of authors
expressed herein do not necessarily state or reflect those of the U.S.
Government or any agency thereof.
NR 15
TC 5
Z9 5
U1 0
U2 5
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1387-3806
J9 INT J MASS SPECTROM
JI Int. J. Mass Spectrom.
PD SEP-OCT
PY 2010
VL 296
IS 1-3
BP 21
EP 24
DI 10.1016/j.ijms.2010.07.015
PG 4
WC Physics, Atomic, Molecular & Chemical; Spectroscopy
SC Physics; Spectroscopy
GA 673YC
UT WOS:000283699100004
ER
PT J
AU Watson, JP
Wets, RJB
Woodruff, DL
AF Watson, Jean-Paul
Wets, Roger J-B
Woodruff, David L.
TI Scalable Heuristics for a Class of Chance-Constrained Stochastic
Programs
SO INFORMS JOURNAL ON COMPUTING
LA English
DT Article
DE stochastic programming; chance constraints; scenario-based
decomposition; heuristics
ID OPTIMIZATION
AB We describe computational procedures for solving a wide-ranging class of stochastic programs with chance constraints where the random components of the problem are discretely distributed. Our procedures are based on a combination of Lagrangian relaxation and scenario decomposition, which we solve using a novel variant of Rockafellar and Wets' progressive hedging algorithm [Rockafellar, R. T., R. J.-B. Wets. 1991. Scenarios and policy aggregation in optimization under uncertainty. Math. Oper. Res. 16(1) 119-147]. Experiments demonstrate the ability of the proposed algorithm to quickly find near-optimal solutions-where verifiable-to both difficult and very large chance-constrained stochastic programs, both with and without integer decision variables. The algorithm exhibits strong scalability in terms of both run time required and final solution quality on large-scale instances.
C1 [Watson, Jean-Paul] Sandia Natl Labs, Discrete Math & Complex Syst Dept, Albuquerque, NM 87185 USA.
[Wets, Roger J-B] Univ Calif Davis, Dept Math, Davis, CA 95616 USA.
[Woodruff, David L.] Univ Calif Davis, Grad Sch Management, Davis, CA 95616 USA.
RP Watson, JP (reprint author), Sandia Natl Labs, Discrete Math & Complex Syst Dept, POB 5800, Albuquerque, NM 87185 USA.
EM jwatson@sandia.gov; rjbwets@ucdavis.edu; dlwoodruff@ucdavis.edu
FU United States Department of Energy [DE-AC04-94AL85000]
FX Sandia is a multipurpose laboratory operated by Sandia Corporation, a
Lockheed-Martin Company, for the United States Department of Energy
under contract DE-AC04-94AL85000. The authors appreciate the detailed
comments from the two anonymous reviewers, which significantly improved
the final presentation of this paper.
NR 16
TC 6
Z9 6
U1 0
U2 4
PU INFORMS
PI HANOVER
PA 7240 PARKWAY DR, STE 310, HANOVER, MD 21076-1344 USA
SN 1091-9856
J9 INFORMS J COMPUT
JI INFORMS J. Comput.
PD FAL
PY 2010
VL 22
IS 4
BP 543
EP 554
DI 10.1287/ijoc.1090.0372
PG 12
WC Computer Science, Interdisciplinary Applications; Operations Research &
Management Science
SC Computer Science; Operations Research & Management Science
GA 675PH
UT WOS:000283842100005
ER
PT J
AU Marland, G
AF Marland, Gregg
TI Can geoengineering be green?
SO ISSUES IN SCIENCE AND TECHNOLOGY
LA English
DT Letter
C1 Oak Ridge Natl Lab, Carbon Climate Simulat Sci Grp, Oak Ridge, TN 37831 USA.
RP Marland, G (reprint author), Oak Ridge Natl Lab, Carbon Climate Simulat Sci Grp, Oak Ridge, TN 37831 USA.
EM marlandgh@ornl.gov
NR 0
TC 0
Z9 0
U1 0
U2 1
PU NATL ACAD SCIENCES
PI WASHINGTON
PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA
SN 0748-5492
J9 ISSUES SCI TECHNOL
JI Issues Sci. Technol.
PD FAL
PY 2010
VL 27
IS 1
BP 13
EP 14
PG 2
WC Engineering, Multidisciplinary; Engineering, Industrial;
Multidisciplinary Sciences; Social Issues
SC Engineering; Science & Technology - Other Topics; Social Issues
GA 676MC
UT WOS:000283914700008
ER
PT J
AU Ollivier-Gooch, C
Diachin, L
Shephard, MS
Tautges, T
Kraftcheck, J
Leung, V
Luo, XJ
Miller, M
AF Ollivier-Gooch, Carl
Diachin, Lori
Shephard, Mark S.
Tautges, Timothy
Kraftcheck, Jason
Leung, Vitus
Luo, Xiaojuan
Miller, Mark
TI An Interoperable, Data-Structure-Neutral Component for Mesh Query and
Manipulation
SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE
LA English
DT Article
DE Design; Performance; Data structure independence; mesh-based
simulations; mesh modification; software components
ID GENERATION; GEOMETRY
AB Much of the effort required to create a new simulation code goes into developing infrastructure for mesh data manipulation, adaptive refinement, design optimization, and so forth. This infrastructure is an obvious target for code reuse, except that implementations of these functionalities are typically tied to specific data structures. In this article, we describe a software component-an abstract data model and programming interface-designed to provide low-level mesh query and manipulation support for meshing and solution algorithms. The component's data model provides a data abstraction, completely hiding all details of how mesh data is stored, while its interface defines how applications can interact with that data. Because the component has been carefully designed to be general purpose and efficient, it provides a practical platform for implementing high-level mesh operations independently of the underlying mesh data structures. After describing the data model and interface, we provide several usage examples, each of which has been used successfully with multiple implementations of the interface functionality. The overhead due to accessing mesh data through the interface rather than directly accessing the underlying mesh data is shown to be acceptably small.
C1 [Ollivier-Gooch, Carl] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada.
[Diachin, Lori; Miller, Mark] Lawrence Livermore Natl Lab, Livermore, CA USA.
[Shephard, Mark S.; Luo, Xiaojuan] Rensselaer Polytech Inst, Troy, NY 12181 USA.
[Tautges, Timothy] Argonne Natl Lab, Argonne, IL 60439 USA.
[Kraftcheck, Jason] Univ Wisconsin, Madison, WI 53706 USA.
RP Ollivier-Gooch, C (reprint author), Univ British Columbia, Vancouver, BC V5Z 1M9, Canada.
EM cfog@mech.ubc.ca
RI Ollivier-Gooch, Carl/E-8934-2011
OI Ollivier-Gooch, Carl/0000-0001-6514-058X
FU U.S. Department of Energy; Canadian Natural Sciences and Engineering
Research Council
FX This work was funded by the U.S. Department of Energy under the
Scientific Discovery through Advanced Computing (SciDAC) program and by
the Canadian Natural Sciences and Engineering Research Council under a
Special Research Opportunities grant.
NR 25
TC 4
Z9 4
U1 0
U2 1
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA
SN 0098-3500
J9 ACM T MATH SOFTWARE
JI ACM Trans. Math. Softw.
PD SEP
PY 2010
VL 37
IS 3
AR 29
DI 10.1145/1824801.1824807
PG 28
WC Computer Science, Software Engineering; Mathematics, Applied
SC Computer Science; Mathematics
GA 661VU
UT WOS:000282761200006
ER
PT J
AU Yamazaki, I
Bai, ZJ
Simon, H
Wang, LW
Wu, KS
AF Yamazaki, Ichitaro
Bai, Zhaojun
Simon, Horst
Wang, Lin-Wang
Wu, Kesheng
TI Adaptive Projection Subspace Dimension for the Thick-Restart Lanczos
Method
SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE
LA English
DT Article
DE Algorithms; Design; Performance; Adaptive subspace dimension; Lanczos;
thick-restart; electronic structure calculation
ID ELECTRONIC-STRUCTURE CALCULATIONS; EIGENVALUE PROBLEMS; ARNOLDI METHOD;
DAVIDSON; SYSTEMS; ENERGY
AB The Thick-Restart Lanczos (TRLan) method is an effective method for solving large-scale Hermitian eigenvalue problems. The performance of the method strongly depends on the dimension of the projection subspace used at each restart. In this article, we propose an objective function to quantify the effectiveness of the selection of subspace dimension, and then introduce an adaptive scheme to dynamically select the dimension to optimize the performance. We have developed an open-source software package alpha-TRLan to include this adaptive scheme in the TRLan method. When applied to calculate the electronic structure of quantum dots, alpha-TRLan runs up to 2.3x faster than a state-of-the-art preconditioned conjugate gradient eigensolver.
C1 [Yamazaki, Ichitaro; Bai, Zhaojun] Univ Calif Davis, Dept Comp Sci, Davis, CA 95616 USA.
[Simon, Horst; Wang, Lin-Wang; Wu, Kesheng] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Yamazaki, I (reprint author), Univ Calif Davis, Dept Comp Sci, 1 Shields Ave, Davis, CA 95616 USA.
EM yamazaki@cs.ucdavis.edu; bai@cs.ucdavis.edu; hdsimon@lbl.gov;
lwwang@lbl.gov; kwu@lbl.gov
FU Office of Science of the U.S. Department of Energy [DE-AC02-05CH11231,
DE-FC02-06ER25794]; NSF [DMS-0611548, OCI-0749217]
FX This work was supported in part by the Office of Science of the U.S.
Department of Energy under Contract No. DE-AC02-05CH11231. Z. Bai was
also supported in part by NSF grants DMS-0611548 and OCI-0749217 and DOE
grant DE-FC02-06ER25794. This research used resources from the National
Energy Research Scientific Computing Center, which is supported by the
Office of Energy Research of the U.S. Department of Energy.
NR 22
TC 7
Z9 7
U1 0
U2 11
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA
SN 0098-3500
J9 ACM T MATH SOFTWARE
JI ACM Trans. Math. Softw.
PD SEP
PY 2010
VL 37
IS 3
AR 27
DI 10.1145/1824801.1824805
PG 18
WC Computer Science, Software Engineering; Mathematics, Applied
SC Computer Science; Mathematics
GA 661VU
UT WOS:000282761200004
ER
PT J
AU Vorobeychik, Y
AF Vorobeychik, Yevgeniy
TI Probabilistic Analysis of Simulation-Based Games
SO ACM TRANSACTIONS ON MODELING AND COMPUTER SIMULATION
LA English
DT Article
DE Game theory; simulation and modeling; simulation; Nash equilibrium
AB The field of game theory has proved to be of great importance in modeling interactions between self-interested parties in a variety of settings. Traditionally, game-theoretic analysis relied on highly stylized models to provide interesting insights about problems at hand. The shortcoming of such models is that they often do not capture vital detail. On the other hand, many real strategic settings, such as sponsored search auctions and supply-chains, can be modeled in high resolution using simulations. Recently, a number of approaches have been introduced to perform analysis of game-theoretic scenarios via simulation-based models. The first contribution of this work is the asymptotic analysis of Nash equilibria obtained from simulation-based models. The second contribution is to derive expressions for probabilistic bounds on the quality of Nash equilibrium solutions obtained using simulation data. In this vein, we derive very general distribution-free bounds, as well as bounds which rely on the standard normality assumptions, and extend the bounds to infinite games via Lipschitz continuity. Finally, we introduce a new maximum-a-posteriori estimator of Nash equilibria based on game-theoretic simulation data and show that it is consistent and almost surely unique.
C1 Univ Penn, Sandia Natl Labs, Philadelphia, PA 19104 USA.
RP Vorobeychik, Y (reprint author), Univ Penn, Sandia Natl Labs, Philadelphia, PA 19104 USA.
EM eug.vorobey@gmail.com
OI Vorobeychik, Yevgeniy/0000-0003-2471-5345
NR 29
TC 4
Z9 4
U1 0
U2 0
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA
SN 1049-3301
EI 1558-1195
J9 ACM T MODEL COMPUT S
JI ACM Trans. Model. Comput. Simul.
PD SEP
PY 2010
VL 20
IS 3
AR 16
DI 10.1145/1842713.1842719
PG 25
WC Computer Science, Interdisciplinary Applications; Mathematics, Applied
SC Computer Science; Mathematics
GA 661WV
UT WOS:000282764400006
ER
PT J
AU Hemmert, KS
Underwood, KD
AF Hemmert, K. Scott
Underwood, Keith D.
TI Fast, Efficient Floating-Point Adders and Multipliers for FPGAs
SO ACM TRANSACTIONS ON RECONFIGURABLE TECHNOLOGY AND SYSTEMS
LA English
DT Article
DE Design; Performance; FPGA; HPC; reconfigurable computing; floating point
AB Floating-point applications are a growing trend in the FPGA community. As such, it has become critical to create floating-point units optimized for standard FPGA technology. Unfortunately, the FPGA design space is very different from the VLSI design space; thus, optimizations for FPGAs can differ significantly from optimizations for VLSI. In particular, the FPGA environment constrains the design space such that only limited parallelism can be effectively exploited to reduce latency. Obtaining the right balances between clock speed, latency, and area in FPGAs can be particularly challenging. This article presents implementation details for an IEEE-754 standard floating-point adder and multiplier for FPGAs. The designs presented here enable a Xilinx Virtex4 FPGA (-11 speed grade) to achieve 270 MHz IEEE compliant double precision floating-point performance with a 9-stage adder pipeline and 14-stage multiplier pipeline. The area requirement is approximately 500 slices for the adder and under 750 slices for the multiplier.
C1 [Hemmert, K. Scott] Sandia Natl Labs, Albuquerque, NM 87185 USA.
[Underwood, Keith D.] Intel Corp, Albuquerque, NM 87185 USA.
RP Hemmert, KS (reprint author), Sandia Natl Labs, POB 5800,MS-1319, Albuquerque, NM 87185 USA.
EM Kshemme@sandia.gov
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
DE-AC04-94AL85000.
NR 27
TC 5
Z9 5
U1 0
U2 2
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA
SN 1936-7406
EI 1936-7414
J9 ACM T RECONFIG TECHN
JI ACM T. Reconfigurable Technol. Syst.
PD SEP
PY 2010
VL 3
IS 3
AR 11
DI 10.1145/1839480.1839481
PG 30
WC Computer Science, Hardware & Architecture
SC Computer Science
GA V20VH
UT WOS:000208167000001
ER
PT J
AU Chin, JC
Rao, NSV
Yau, DKY
Shankar, M
Yang, Y
Hou, JC
Srivathsan, S
Iyengar, S
AF Chin, Jren-Chit
Rao, Nageswara S. V.
Yau, David K. Y.
Shankar, Mallikarjun
Yang, Yong
Hou, Jennifer C.
Srivathsan, Srinivasagopalan
Iyengar, Sitharama
TI Identification of Low-Level Point Radioactive Sources Using a Sensor
Network
SO ACM TRANSACTIONS ON SENSOR NETWORKS
LA English
DT Article
DE Algorithms; Design; Experimentation; Performance; Point radioactive
source; detection and localization; sequential probability ratio test
ID LOCATION; SCHEME
AB Identification of a low-level point radioactive source amidst background radiation is achieved by a network of radiation sensors using a two-step approach. Based on measurements from three or more sensors, a geometric difference triangulation method or an N-sensor localization method is used to estimate the location and strength of the source. Then a sequential probability ratio test based on current measurements and estimated parameters is employed to finally decide: (1) the presence of a source with the estimated parameters, or (2) the absence of the source, or (3) the insufficiency of measurements to make a decision. This method achieves specified levels of false alarm and missed detection probabilities, while ensuring a close-to-minimal number of measurements for reaching a decision. This method minimizes the ghost-source problem of current estimation methods, and achieves a lower false alarm rate compared with current detection methods. This method is tested and demonstrated using: (1) simulations, and (2) a test-bed that utilizes the scaling properties of point radioactive sources to emulate high intensity ones that cannot be easily and safely handled in laboratory experiments.
C1 [Chin, Jren-Chit; Yau, David K. Y.] Purdue Univ, W Lafayette, IN 47907 USA.
[Rao, Nageswara S. V.; Shankar, Mallikarjun] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
[Yang, Yong; Hou, Jennifer C.] Univ Illinois, Urbana, IL 61801 USA.
[Srivathsan, Srinivasagopalan; Iyengar, Sitharama] Louisiana State Univ, Baton Rouge, LA 70803 USA.
RP Chin, JC (reprint author), Purdue Univ, W Lafayette, IN 47907 USA.
EM jcchin@cs.purdue.edu
RI Shankar, Mallikarjun/N-4400-2015;
OI Shankar, Mallikarjun/0000-0001-5289-7460; Rao,
Nageswara/0000-0002-3408-5941
FU U.S. Department of Energy [AC05-OOOR22725]; Office of Advanced Computing
Research; U.S. National Science Foundation [CNS-0964086]
FX Research was supported in part by the U.S. Department of Energy under
SensorNet grant no. AC05-OOOR22725 and Mathematics of Complex,
Distributed, Interconnected Systems program, Office of Advanced
Computing Research, and in part by the U.S. National Science Foundation
under grant no. CNS-0964086; work was performed at Purdue University and
Oak Ridge National Laboratory managed by UT-Battelle, LLC.
NR 42
TC 13
Z9 13
U1 0
U2 3
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA
SN 1550-4859
J9 ACM T SENSOR NETWORK
JI ACM Trans. Sens. Netw.
PD SEP
PY 2010
VL 7
IS 3
AR 21
DI 10.1145/1807048.1807050
PG 35
WC Computer Science, Information Systems; Telecommunications
SC Computer Science; Telecommunications
GA 699XI
UT WOS:000285695800002
ER
PT J
AU Djidjev, HN
AF Djidjev, Hristo N.
TI Approximation Algorithms for Computing Minimum Exposure Paths in a
Sensor Field
SO ACM TRANSACTIONS ON SENSOR NETWORKS
LA English
DT Article
DE Algorithms; Performance; Theory; Sensor networks; minimum exposure
paths; coverage; approximation algorithms; shortest paths
ID NETWORKS; COVERAGE
AB The exposure of a path p in a sensor field is a measure of the likelihood that an object traveling along p is detected by at least one sensor from a network of sensors, and is formally defined as an integral over all points x of p of the sensibility (the strength of the signal coming from x) times the element of path length. The minimum exposure path (MEP) problem is, given a pair of points x and y inside a sensor field, to find a path between x and y of minimum exposure. In this article we introduce the first rigorous treatment of the problem, designing an approximation algorithm for the MEP problem with guaranteed performance characteristics. Given a convex polygon P of size n with O(n) sensors inside it and any real number epsilon > 0, our algorithm finds a path in P whose exposure is within an 1 + epsilon factor of the exposure of the MEP, in time O(n/epsilon(2)psi log n), where. is a geometric characteristic of the field. We also describe a framework for a faster implementation of our algorithm, which reduces the time by a factor of approximately Theta(1/epsilon), while keeping the same approximation ratio.
C1 Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Djidjev, HN (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM djidjev@lanl.gov
FU Department of Energy [W-705-ENG-36]
FX This work has been supported by the Department of Energy under contract
W-705-ENG-36.
NR 21
TC 2
Z9 2
U1 0
U2 1
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 2 PENN PLAZA, STE 701, NEW YORK, NY 10121-0701 USA
SN 1550-4859
J9 ACM T SENSOR NETWORK
JI ACM Trans. Sens. Netw.
PD SEP
PY 2010
VL 7
IS 3
AR 23
DI 10.1145/1807048.1807052
PG 25
WC Computer Science, Information Systems; Telecommunications
SC Computer Science; Telecommunications
GA 699XI
UT WOS:000285695800004
ER
PT J
AU Chen, JJA
Chen, TL
Kim, B
Poulsen, DA
Mynar, JL
Frechet, JMJ
Ma, BW
AF Chen, John Jun-An
Chen, Teresa L.
Kim, BongSoo
Poulsen, Daniel A.
Mynar, Justin L.
Frechet, Jean M. J.
Ma, Biwu
TI Quinacridone-Based Molecular Donors for Solution Processed
Bulk-Heterojunction Organic Solar Cells
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE organic solar cells; pigments; quinacridones; molecular donors; bulk
heterojunction
ID LUMINESCENT PROPERTIES; PHOTOVOLTAIC CELLS; EFFICIENCY; FLUORESCENCE;
DERIVATIVES; FLUORENE; FILMS; COST; GAP
AB New soluble quinacridone-based molecules have been developed as electron donor materials for solution-processed organic solar cells. By functionalizing the pristine pigment core of quinacridone with solubilizing alkyl chains and light absorbing/charge transporting thiophene units, i.e., bithiophene (BT) and thienylbenzo[c][1,2,5]thiadiazolethienyl (BTD), we prepared a series of multifunctional quinacridone-based molecules. These molecular donors show intense absorption in the visible spectral region, and the absorption range and intensity are well-tuned by the interaction between the quinacridone core and the incorporated thiophene units. The thin film absorption edge extends with the expansion of molecular conjugation, i.e., 552 nm for N,N'-di(2-ethylhexyl)quinacridone (QA), 592 nm for 2,9-Bis(5'-hexy1-2,2'-bithiophene)-N,N'-di(2-ethylhexyl)quinacridone (QA-BT), and 637 nm for 4-(5hexylthiophen-2-y1)-7-(thiophen-2-Abenzo[c][1,2,5]chiadiazole (QA-BTD). The change of molecular structure also influences the electrochemical properties. Observed from cyclic voltammetry measurements, the oxidation and reduction potentials (vs ferrocene) are 0.7 and 1.83 V for QA, 0.54 and 1.76 V for QA-BT, and 0.45 and 1.68 V for QA-BTD. Uniform thin films can be generated from both single component molecular solutions and blend solutions of these molecules with [6,61-phenyl C70-butyric acid methyl ester (PC70BM). The blend films exhibit space-charge limited current (SCLC) hole mobilities on the order of 1 x 10(-4) cm(2) V-1 s(-1) Bulk heterojunction (BHJ) solar cells using these soluble molecules as donors and PC70BM as the acceptor were fabricated. Power conversion efficiencies (PCEs) of up to 2.22% under AM 1.5 G simulated 1 sun solar illumination have been achieved and external quantum efficiencies (EQEs) reach as high as similar to 45%.
C1 [Kim, BongSoo; Poulsen, Daniel A.; Mynar, Justin L.; Frechet, Jean M. J.] Univ Calif Berkeley, Coll Chem, Berkeley, CA 94720 USA.
[Chen, John Jun-An; Chen, Teresa L.; Frechet, Jean M. J.; Ma, Biwu] Univ Calif Berkeley, Lawrence Berkeley Lab, Mol Foundry, Berkeley, CA 94720 USA.
RP Frechet, JMJ (reprint author), Univ Calif Berkeley, Coll Chem, Berkeley, CA 94720 USA.
EM frechet@berkeley.edu; BWMa@lbl.gov
RI Ma, Biwu/B-6943-2012;
OI Frechet, Jean /0000-0001-6419-0163
FU Office of Science, Office of Basic Energy Sciences, Scientific User
Facilities Division, and the Materials Sciences and Engineering
Division, U.S. Department of Energy [DE-ACO2-05C1-11 1231]
FX This work was performed at the Molecular Foundry, Lawrence Berkeley
National Laboratory, and was supported by the Office of Science, Office
of Basic Energy Sciences, Scientific User Facilities Division, and the
Materials Sciences and Engineering Division, U.S. Department of Energy,
under Contract DE-ACO2-05C1-11 1231.
NR 30
TC 57
Z9 57
U1 1
U2 38
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD SEP
PY 2010
VL 2
IS 9
BP 2679
EP 2686
DI 10.1021/am100523g
PG 8
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 652OR
UT WOS:000282017700030
PM 20804141
ER
PT J
AU Coffey, DC
Ferguson, AJ
Kopidakis, N
Rumbles, G
AF Coffey, David C.
Ferguson, Andrew J.
Kopidakis, Nikos
Rumbles, Garry
TI Photovoltaic Charge Generation in Organic Semiconductors Based on
Long-Range Energy Transfer
SO ACS NANO
LA English
DT Article
DE solar cell; energy transfer; charge transfer; Forster; FRET; organic
semiconductor; photovoltaic; microwave conductivity
ID HETEROJUNCTION SOLAR-CELLS; EXCITON DIFFUSION LENGTH; BULK
HETEROJUNCTION; EFFICIENCY; POLYMERS; FILMS; PHOTOSYNTHESIS;
DISSOCIATION; MORPHOLOGY; BILAYERS
AB For efficient charge generation in organic solar cells, photogenerated excitons must migrate to a donor/acceptor interface where they can be dissociated. This migration is traditionally presumed to be based on diffusion through the absorber material. Herein we study an alternative migration route-two-step exciton dissociation-whereby the exciton jumps from the donor to acceptor before charge creation takes place. We study this process in a series of multilayer donor/barrier/acceptor samples, where either poly(3-hexylthiophene) (P3HT) or copper phthalocyanine (CuPc) is the donor, fullerene (C(60)) is the acceptor, and N,N-diphenyl-N,N-bis(3-methylphenyl)[1,1-bisphenyl]-4,4-diamine (TPD) acts as a barrier to energy transfer. By varying the thickness of the barrier layer, we find that energy transfer from P3HT to C(60) proceeds over large distances (similar to 50% probability of transfer across a 11 nm barrier), and that this process is consistent with long-range Forster resonance energy transfer (FRET). Finally, we demonstrate a fundamentally different architecture concept that utilizes the two-step mechanism to enhance performance in a series of P3HT/CuPc/C(60) devices.
C1 [Coffey, David C.; Ferguson, Andrew J.; Kopidakis, Nikos; Rumbles, Garry] Natl Renewable Energy Lab, Chem & Mat Sci Ctr, Golden, CO 80401 USA.
RP Rumbles, G (reprint author), Natl Renewable Energy Lab, Chem & Mat Sci Ctr, 1617 Cole Blvd, Golden, CO 80401 USA.
EM garry.rumbles@nrel.gov
RI Rumbles, Garry/A-3045-2014; Kopidakis, Nikos/N-4777-2015;
OI Rumbles, Garry/0000-0003-0776-1462; Ferguson, Andrew/0000-0003-2544-1753
FU U.S. Department of Energy, Office of Science, Basic Energy Sciences,
Division of Chemical Sciences, Geosciences and Biosciences
[DE-AC36-08-GO28308]
FX We gratefully acknowledge Ross Larsen and Matthew Lloyd for valuable
insight and discussion, and the Gregg lab for assistance making devices.
This work was funded by the Solar Photochemistry program of the U.S.
Department of Energy, Office of Science, Basic Energy Sciences, Division
of Chemical Sciences, Geosciences and Biosciences, under Contract No.
DE-AC36-08-GO28308 to NREL.
NR 42
TC 56
Z9 57
U1 4
U2 63
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1936-0851
J9 ACS NANO
JI ACS Nano
PD SEP
PY 2010
VL 4
IS 9
BP 5437
EP 5445
DI 10.1021/nn101106b
PG 9
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 653TY
UT WOS:000282121000060
PM 20735062
ER
PT J
AU Ranjan, V
Yu, L
Nakhmanson, S
Bernholc, J
Nardelli, MB
AF Ranjan, V.
Yu, L.
Nakhmanson, Serge
Bernholc, Jerry
Nardelli, M. Buongiorno
TI Polarization effects and phase equilibria in high-energy-density
polyvinylidene-fluoride-based polymers
SO ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES
LA English
DT Article
ID POLY(VINYLIDENE FLUORIDE); MODEL
AB Using first-principles calculations, the phase diagrams of polyvinylidene fluoride (PVDF) and its copolymers under an applied electric field are studied and phase transitions between their nonpolar alpha and polar beta phases are discussed. The results show that the degree of copolymerization is a crucial parameter controlling the structural phase transition. In particular, for tetrafluoroethylene (TeFE) concentration above 12%, PVDF-TeFE is stabilized in the beta phase, whereas the alpha phase is stable for lower concentrations. As larger electric fields are applied, domains with smaller concentrations (<= 12%) undergo a transition from the alpha to the beta phase until a breakdown field of similar to 600 MV m(-1) is reached. These structural phase transitions can be exploited for efficient storage of electrical energy.
C1 [Ranjan, V.; Yu, L.; Bernholc, Jerry; Nardelli, M. Buongiorno] N Carolina State Univ, Ctr High Performance Simulat, Raleigh, NC 27695 USA.
[Ranjan, V.; Yu, L.; Bernholc, Jerry; Nardelli, M. Buongiorno] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA.
[Nakhmanson, Serge] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Bernholc, Jerry; Nardelli, M. Buongiorno] Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA.
RP Nardelli, MB (reprint author), N Carolina State Univ, Ctr High Performance Simulat, Raleigh, NC 27695 USA.
EM mbnardelli@ncsu.edu
RI Yu, Liping/B-4640-2008; Buongiorno Nardelli, Marco/C-9089-2009;
Nakhmanson, Serge/A-6329-2014
FU Office of Naval Research; US DOE [DE-AC02-06CH11357]; US DOE at ORNL
[DE-FG02-98ER14847, DE-AC05-00OR22725]
FX This work was supported by the Office of Naval Research. The
calculations were carried out at the NCCS-ORNL. SN was supported by BES,
US DOE, under contract No. DE-AC02-06CH11357. MBN acknowledges partial
support of BES, US DOE at ORNL (DE-FG02-98ER14847 and DE-AC05-00OR22725
with UT-Batelle, LLC).
NR 25
TC 2
Z9 2
U1 2
U2 14
PU INT UNION CRYSTALLOGRAPHY
PI CHESTER
PA 2 ABBEY SQ, CHESTER, CH1 2HU, ENGLAND
SN 2053-2733
J9 ACTA CRYSTALLOGR A
JI Acta Crystallogr. Sect. A
PD SEP
PY 2010
VL 66
BP 553
EP 557
DI 10.1107/S0108767310026358
PN 5
PG 5
WC Chemistry, Multidisciplinary; Crystallography
SC Chemistry; Crystallography
GA 643PM
UT WOS:000281310600006
PM 20720320
ER
PT J
AU Fielden, J
Ellern, A
Kogerler, P
AF Fielden, John
Ellern, Arkady
Koegerler, Paul
TI [Cr-8(PhCO2)(16)O-4]center dot 4CH(3)CN center dot 2H(2)O: structural
origin of magnetic anisotropy in a molecular spin cluster
SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS
LA English
DT Article
ID OCTANUCLEAR; FRAMEWORK
AB The Cr4O4 hetero-cubane-centered octachromium(III) cluster [Cr-8(PhCO2)(16)O-4] crystallizes from fluorobenzene-acetonitrile as dodeca-mu(2)-benzoato-tetrabenzoatotetra-mu(4)-oxido-octachromium(III) acetonitrile tetrasolvate dihydrate, [Cr-8(C7H5O2)(16)O-4]center dot 4C(2)H(3)N center dot 2H(2)O, (I). Crystals produced by this method are significantly more stable than the originally published dichloromethane pentasolvate, [Cr-8(PhCO2)(16)O-4]center dot 5CH(2)Cl(2) [Atkinson et al. (1999). Chem. Commun. pp. 285-286], leading to a significantly higher quality structure and allowing the production of large quantities of high-quality nondeuterated and deuterated material suitable for inelastic neutron scattering (INS) measurements. Compound (I) reveals a higher symmetry structure in which the cluster sits on a twofold rotation axis, and is based on an asymmetric unit containing four crystallographically independent Cr positions, two oxide ligands, eight benzoate ligands, two acetonitrile solvent molecules and one disordered water molecule. All the Cr atoms are six-coordinate, with an octahedral geometry for the inner cubane and a more highly distorted coordination environment in the outer positions. Despite the higher symmetry, the coordination geometries observed in (I) are largely similar to the dichloromethane pentasolvate structure, indicating that crystal-packing effects have little influence on the molecular structure of [Cr-8(PhCO2)(16)O-4]. Close structural analysis reveals that the high magnetic anisotropy observed in the INS measurements is a consequence of the distorted coordination geometry of the four outer Cr atoms.
C1 [Fielden, John; Koegerler, Paul] Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
[Ellern, Arkady] Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
RP Kogerler, P (reprint author), Iowa State Univ, Ames Lab, Ames, IA 50011 USA.
EM kogerler@ameslab.gov
RI Kogerler, Paul/H-5866-2013
OI Kogerler, Paul/0000-0001-7831-3953
NR 16
TC 1
Z9 1
U1 0
U2 2
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0108-2701
J9 ACTA CRYSTALLOGR C
JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun.
PD SEP
PY 2010
VL 66
BP 253
EP 256
DI 10.1107/S0108270110032683
PN 9
PG 4
WC Chemistry, Multidisciplinary; Crystallography
SC Chemistry; Crystallography
GA 647RD
UT WOS:000281635400008
PM 20814097
ER
PT J
AU Tomanicek, SJ
Hughes, RC
Ng, JD
Coates, L
AF Tomanicek, Stephen J.
Hughes, Ronny C.
Ng, Joseph D.
Coates, Leighton
TI Structure of the endonuclease IV homologue from Thermotoga maritima in
the presence of active-site divalent metal ions
SO ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY AND CRYSTALLIZATION
COMMUNICATIONS
LA English
DT Article
DE apurinic; apyrimidinic endonucleases; endonuclease IV; DNA-repair
proteins; Thermotoga maritima
ID BASE EXCISION-REPAIR; APURINIC APYRIMIDINIC ENDONUCLEASES;
ESCHERICHIA-COLI; SACCHAROMYCES-CEREVISIAE; DAMAGE RECOGNITION; AP
ENDONUCLEASES; DNA-DAMAGE; EXONUCLEASE; EVOLUTION; PROTEINS
AB The most frequent lesion in DNA is at apurinic/apyrimidinic (AP) sites resulting from DNA-base losses. These AP-site lesions can stall DNA replication and lead to genome instability if left unrepaired. The AP endonucleases are an important class of enzymes that are involved in the repair of AP-site intermediates during damage-general DNA base-excision repair pathways. These enzymes hydrolytically cleave the 5'-phosphodiester bond at an AP site to generate a free 3'-hydroxyl group and a 5'-terminal sugar phosphate using their AP nuclease activity. Specifically, Thermotoga maritima endonuclease IV is a member of the second conserved AP endonuclease family that includes Escherichia coli endonuclease IV, which is the archetype of the AP endonuclease superfamily. In order to more fully characterize the AP endonuclease family of enzymes, two X-ray crystal structures of the T. maritima endonuclease IV homologue were determined in the presence of divalent metal ions bound in the active-site region. These structures of the T. maritima endonuclease IV homologue further revealed the use of the TIM-barrel fold and the trinuclear metal binding site as important highly conserved structural elements that are involved in DNA-binding and AP-site repair processes in the AP endonuclease superfamily.
C1 [Tomanicek, Stephen J.; Hughes, Ronny C.; Coates, Leighton] Oak Ridge Natl Lab, Neutron Scattering Sci Div, Oak Ridge, TN 37831 USA.
[Hughes, Ronny C.; Ng, Joseph D.] Univ Alabama, Dept Biol Sci, Struct Biol Lab, Huntsville, AL 35899 USA.
RP Coates, L (reprint author), Oak Ridge Natl Lab, Neutron Scattering Sci Div, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA.
EM coatesl@ornl.gov
OI Coates, Leighton/0000-0003-2342-049X
FU US Department of Energy [DE-AC05-00OR22725]; Office of Biological and
Environmental Research
FX We thank Dr Jenny P. Glusker for a critical review of the manuscript and
valuable comments. 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 US Department of
Energy under Contract No. DE-AC05-00OR22725. The research at Oak Ridge
National Laboratory's Center for Structural Molecular Biology (CSMB) was
supported by the Office of Biological and Environmental Research, using
facilities supported by the US Department of Energy, managed by
UT-Battelle LLC under contract No. DE-AC05-00OR22725.
NR 46
TC 3
Z9 3
U1 0
U2 0
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1744-3091
J9 ACTA CRYSTALLOGR F
JI Acta Crystallogr. F-Struct. Biol. Cryst. Commun.
PD SEP
PY 2010
VL 66
BP 1003
EP 1012
DI 10.1107/S1744309110028575
PN 9
PG 10
WC Biochemical Research Methods; Biochemistry & Molecular Biology;
Biophysics; Crystallography
SC Biochemistry & Molecular Biology; Biophysics; Crystallography
GA 647RF
UT WOS:000281635600007
PM 20823514
ER
PT J
AU Marapakala, K
Ajees, AA
Qin, J
Sankaran, B
Rosen, BP
AF Marapakala, Kavitha
Ajees, A. Abdul
Qin, Jie
Sankaran, Banumathi
Rosen, Barry P.
TI Crystallization and preliminary X-ray diffraction analysis of rat
autotaxin
SO ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY AND CRYSTALLIZATION
COMMUNICATIONS
LA English
DT Article
DE autotaxin; (ecto)nucleotide pyrophosphatase; phosphodiesterase 2;
lysophosphatidylcholine; lysophosphatidylcholine
AB Rat autotaxin has been cloned, expressed, purified to homogeneity and crystallized via hanging-drop vapour diffusion using PEG 3350 as precipitant and ammonium iodide and sodium thiocyanate as salts. The crystals diffracted to a maximum resolution of 2.05 A and belonged to space group P1, with unit-cell parameters a = 53.8, b = 63.3, c = 70.5 A, alpha = 98.8, beta = 106.2, gamma = 99.8 degrees. Preliminary X-ray diffraction analysis indicated the presence of one molecule per asymmetric unit, with a solvent content of 47%.
C1 [Marapakala, Kavitha; Ajees, A. Abdul; Qin, Jie; Rosen, Barry P.] Florida Int Univ, Dept Cellular Biol & Pharmacol, Herbert Wertheim Coll Med, Miami, FL 33199 USA.
[Sankaran, Banumathi; Rosen, Barry P.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley Ctr Struct Biol, Berkeley, CA 94720 USA.
RP Rosen, BP (reprint author), Florida Int Univ, Dept Cellular Biol & Pharmacol, Herbert Wertheim Coll Med, Miami, FL 33199 USA.
EM brosen@fiu.edu
OI Abdul Salam, Abdul Ajees/0000-0002-3377-3048
FU US National Institutes of Health [GM55425]; Office of Science, Office of
Basic Energy Sciences of the US Department of Energy
[DE-AC02-05CH11231]; National Institutes of Health, National Institute
of General Medical Sciences; Howard Hughes Medical Institute
FX This study was supported in part by US National Institutes of Health
Grant GM55425. The Berkeley Center for Structural Biology is supported
in part by the National Institutes of Health, National Institute of
General Medical Sciences and the Howard Hughes Medical Institute. The
Advanced Light Source 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.
NR 8
TC 11
Z9 11
U1 0
U2 1
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1744-3091
J9 ACTA CRYSTALLOGR F
JI Acta Crystallogr. F-Struct. Biol. Cryst. Commun.
PD SEP
PY 2010
VL 66
BP 1050
EP 1052
DI 10.1107/S1744309110027661
PN 9
PG 3
WC Biochemical Research Methods; Biochemistry & Molecular Biology;
Biophysics; Crystallography
SC Biochemistry & Molecular Biology; Biophysics; Crystallography
GA 647RF
UT WOS:000281635600016
PM 20823523
ER
PT J
AU Khare, B
Samal, A
Vengadesan, K
Rajashankar, KR
Ma, X
Huang, IH
Ton-That, H
Narayana, SVL
AF Khare, Baldeep
Samal, Alexandra
Vengadesan, Krishnan
Rajashankar, K. R.
Ma, Xin
Huang, I-Hsiu
Ton-That, Hung
Narayana, Sthanam V. L.
TI Preliminary crystallographic study of the Streptococcus agalactiae
sortases, sortase A and sortase C1
SO ACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY AND CRYSTALLIZATION
COMMUNICATIONS
LA English
DT Article
DE sortases; sortase A; sortase C1; Streptococcus agalactiae
ID GROUP-B STREPTOCOCCUS; GRAM-POSITIVE BACTERIA; CELL-WALL; NONPREGNANT
ADULTS; SURFACE-PROTEINS; STAPHYLOCOCCUS-AUREUS; DISEASE; PILI;
COLONIZATION; PNEUMONIAE
AB Sortases are cysteine transpeptidases that are essential for the assembly and anchoring of cell-surface adhesins in Gram-positive bacteria. In Streptococcus agalactiae (GBS), the pilin-specific sortase SrtC1 catalyzes the polymerization of pilins encoded by pilus island 1 (PI-1) and the housekeeping sortase SrtA is necessary for cell-wall anchoring of the resulting pilus polymers. These sortases are known to utilize different substrates for pilus polymerization and cell-wall anchoring; however, the structural correlates that dictate their substrate specificity have not yet been clearly defined. This report presents the expression, purification and crystallization of SrtC1 (SAG0647) and SrtA (SAG0961) from S. agalactiae strain 2603V/R. The GBS SrtC1 has been crystallized in three crystal forms and the GBS SrtA has been crystallized in one crystal form.
C1 [Khare, Baldeep; Samal, Alexandra; Vengadesan, Krishnan; Narayana, Sthanam V. L.] Univ Alabama, Ctr Biophys Sci & Engn, Sch Optometry, Birmingham, AL 35294 USA.
[Rajashankar, K. R.; Huang, I-Hsiu; Ton-That, Hung] Argonne Natl Lab, NE CAT, Adv Photon Source, Chicago, IL USA.
[Ma, Xin] Univ Texas Hlth Sci Ctr, Houston, TX 77030 USA.
RP Narayana, SVL (reprint author), Univ Alabama, Ctr Biophys Sci & Engn, Sch Optometry, Birmingham, AL 35294 USA.
EM narayana@uab.edu
OI Ton-That, Hung/0000-0003-1611-0469
FU NIH
FX We are grateful to the staff of the NE-CAT (24-ID) and SER-CAT (22-ID)
beamlines of the Advanced Photon Source, Illinois, Chicago for their
help with data collection. This work was supported by funding from NIH
(SVLN).
NR 32
TC 5
Z9 5
U1 0
U2 1
PU WILEY-BLACKWELL PUBLISHING, INC
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1744-3091
J9 ACTA CRYSTALLOGR F
JI Acta Crystallogr. F-Struct. Biol. Cryst. Commun.
PD SEP
PY 2010
VL 66
BP 1096
EP 1100
DI 10.1107/S1744309110031106
PN 9
PG 5
WC Biochemical Research Methods; Biochemistry & Molecular Biology;
Biophysics; Crystallography
SC Biochemistry & Molecular Biology; Biophysics; Crystallography
GA 647RF
UT WOS:000281635600029
PM 20823536
ER
PT J
AU Rohrer, GS
Holm, EA
Rollett, AD
Foiles, SM
Li, J
Olmsted, DL
AF Rohrer, Gregory S.
Holm, Elizabeth A.
Rollett, Anthony D.
Foiles, Stephen M.
Li, Jia
Olmsted, David L.
TI Comparing calculated and measured grain boundary energies in nickel
SO ACTA MATERIALIA
LA English
DT Article
DE Grain boundary energy; Grain boundary junctions; MD-simulations; EBSD;
Serial sectioning
ID CRYSTALLITE ROTATION METHOD; 5 MACROSCOPIC PARAMETERS; VECTOR
THERMODYNAMICS; ANISOTROPIC SURFACES; INTERFACIAL ENERGIES; TILT
BOUNDARIES; COPPER; MISORIENTATION; GROWTH; SIMULATIONS
AB Recent experimental and computational studies have produced two large grain boundary energy data sets for Ni. Using these results, we perform the first large-scale comparison between measured and computed grain boundary energies. While the overall correlation between experimental and computed energies is minimal, there is excellent agreement for the data in which we have the most confidence, particularly the experimentally prevalent Sigma 3 and Sigma 9 boundary types. Other CSL boundaries are infrequently observed in the experimental system and show little correlation with computed boundary energies. Because they do not depend on observation frequency, computed grain boundary energies are more reliable than the experimental energies for low population boundary types. Conversely, experiments can characterize high population boundaries that are not included in the computational study. Together the experimental and computational data provide a comprehensive catalog of grain boundary energies in Ni that can be used with confidence by microstructural scientists. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Holm, Elizabeth A.; Foiles, Stephen M.] Sandia Natl Labs, Computat Mat Sci & Engn Dept, Albuquerque, NM 87185 USA.
[Rohrer, Gregory S.; Rollett, Anthony D.; Li, Jia] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA.
[Olmsted, David L.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
RP Holm, EA (reprint author), Sandia Natl Labs, Computat Mat Sci & Engn Dept, POB 5800, Albuquerque, NM 87185 USA.
EM Eaholm@sandia.gov
RI Rollett, Anthony/A-4096-2012; Rohrer, Gregory/A-9420-2008; Holm,
Elizabeth/S-2612-2016;
OI Rollett, Anthony/0000-0003-4445-2191; Rohrer,
Gregory/0000-0002-9671-3034; Holm, Elizabeth/0000-0003-3064-5769;
Foiles, Stephen/0000-0002-1907-454X
FU US Department of Energy's National Nuclear Security Administration
[DE-AC0494AL85000]; Department of Energy, Office of Basic Energy
Sciences; National Science Foundation [DMR-0520425]
FX Sandia is a multi-program laboratory operated by Sandia Corporation, a
Lockheed Martin Company, for the US Department of Energy's National
Nuclear Security Administration under contract DE-AC0494AL85000. We
acknowledge support from the Department of Energy, Office of Basic
Energy Sciences both through the core program and through the
Computational Materials Science Network program. The work at CMU was
primarily supported by the MRSEC program of the National Science
Foundation under Award Number DMR-0520425.
NR 45
TC 45
Z9 45
U1 4
U2 50
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD SEP
PY 2010
VL 58
IS 15
BP 5063
EP 5069
DI 10.1016/j.actamat.2010.05.042
PG 7
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 634HD
UT WOS:000280570500016
ER
PT J
AU Lowry, MB
Kiener, D
LeBlanc, MM
Chisholm, C
Florando, JN
Morris, JW
Minor, AM
AF Lowry, M. B.
Kiener, D.
LeBlanc, M. M.
Chisholm, C.
Florando, J. N.
Morris, J. W., Jr.
Minor, A. M.
TI Achieving the ideal strength in annealed molybdenum nanopillars
SO ACTA MATERIALIA
LA English
DT Article
DE In situ compression; Transmission electron microscopy; Ideal strength;
Focused ion beam; Defect-free
ID MICROPILLARS; DEFORMATION; COMPRESSION; PLASTICITY; NANOWIRES;
STABILITY; CRYSTALS; BEHAVIOR; COPPER; SCALE
AB The theoretical strength of a material is the stress required to deform an infinite, defect-free crystal. Achieving the theoretical strength of a material experimentally is hindered by the ability to create and mechanically test an absolutely defect-free material. Here we show that through annealing it is possible to employ the versatility of the focused ion beam (FIB) but recover a mechanically pristine limited volume. Starting with FIB-milled molybdenum pillars, we anneal them in situ in a transmission electron microscope (TEM) producing a molybdenum pillar with a spherical cap. This geometry allows for the maximum stress to occur in the interior of the spherical cap and is ideally suited for experimentally achieving the ideal strength. During in situ compression testing in the TEM the annealed pillars show initial elastic loading followed by catastrophic failure at, or very near, the calculated theoretical strength of molybdenum. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
C1 [Lowry, M. B.; Kiener, D.; Chisholm, C.; Morris, J. W., Jr.; Minor, A. M.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
[Lowry, M. B.; LeBlanc, M. M.; Florando, J. N.] Lawrence Livermore Natl Lab, Engn Directorate, Livermore, CA 94550 USA.
[Kiener, D.; Minor, A. M.] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
RP Minor, AM (reprint author), Univ Calif Berkeley, Dept Mat Sci & Engn, 210 Hearst Mem Min Bldg, Berkeley, CA 94720 USA.
EM aminor@berkeley.edu
RI Kiener, Daniel/B-2202-2008; Chisholm, Claire/I-3566-2016
OI Kiener, Daniel/0000-0003-3715-3986; Chisholm, Claire/0000-0002-8114-5994
FU US Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]; National Center for Electron Microscopy, Lawrence
Berkeley National Laboratory; US Department of Energy [AC02-05CH11231];
Austrian Sciences Fund (FWF) [J2834-N20]; U.S. Department of Energy,
Office of Science, Office of Basic Energy Sciences
FX This work was performed under the auspices of the US Department of
Energy by Lawrence Livermore National Laboratory under Contract
DE-AC52-07NA27344. The authors also acknowledge support of the National
Center for Electron Microscopy, Lawrence Berkeley National Laboratory,
which is supported by the US Department of Energy under Contract
#DE-AC02-05CH11231. D.K. gratefully acknowledges the financial support
of the Austrian Sciences Fund (FWF) through the Erwin Schrodinger
scholarship J2834-N20. C.C. was supported by the Center for Defect
Physics, an Energy Frontier Research Center funded by the U.S.
Department of Energy, Office of Science, Office of Basic Energy
Sciences.
NR 35
TC 57
Z9 57
U1 4
U2 34
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD SEP
PY 2010
VL 58
IS 15
BP 5160
EP 5167
DI 10.1016/j.actamat.2010.05.052
PG 8
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 634HD
UT WOS:000280570500025
ER
PT J
AU Knipling, KE
Karnesky, RA
Lee, CP
Dunand, DC
Seidman, DN
AF Knipling, Keith E.
Karnesky, Richard A.
Lee, Constance P.
Dunand, David C.
Seidman, David N.
TI Precipitation evolution in Al-0.1Sc, Al-0.1Zr and Al-0.1Sc-0.1Zr (at.%)
alloys during isochronal aging
SO ACTA MATERIALIA
LA English
DT Article
DE Aluminum alloys; Precipitation; Scandium; Zirconium; Atom-probe
tomography
ID AL-SC ALLOYS; ELECTRICAL-RESISTIVITY MEASUREMENTS; ELECTRODE ATOM
PROBES; LI SINGLE-CRYSTALS; ZR-TI ALLOYS; ALUMINUM-ALLOYS; AL(SC)
ALLOYS; ELEVATED-TEMPERATURES; MECHANICAL-BEHAVIOR; TEMPORAL EVOLUTION
AB Precipitation strengthening is investigated in binary Al-0.1Sc, Al-0.1Zr and ternary Al-0.1Sc-0.1Zr (at.%) alloys aged isochronally between 200 and 600 degrees C. Precipitation of Al(3)Sc (L1(2)) commences between 200 and 250 degrees C in Al-0.1Sc, reaching a 670 MPa peak microhardness at 325 degrees C. For Al-0.1Zr, precipitation of Al(3)Zr (L1(2)) initiates between 350 and 375 degrees C, resulting in a 420 MPa peak microhardness at 425-450 degrees C. A pronounced synergistic effect is observed when both Sc and Zr are present. Above 325 degrees C, Zr additions provide a secondary strength increase from the precipitation of Zr-enriched outer shells onto the Al(3)Sc precipitates, leading to a peak microhardness of 780 MPa at 400 degrees C for Al-0.1Sc-0.1Zr. Compositions, radii, volume fractions and number densities of the Al(3)(Sc(1-x)Zr(x)) precipitates are measured directly using atom-probe tomography. This information is used to quantify the observed strengthening increments, attributed to dislocation shearing of the Al(3)(Sc(1-x)Zr(x)) precipitates. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.
C1 [Knipling, Keith E.] USN, Res Lab, Multifunct Mat Branch, Washington, DC 20375 USA.
[Knipling, Keith E.; Karnesky, Richard A.; Lee, Constance P.; Dunand, David C.; Seidman, David N.] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA.
[Karnesky, Richard A.] Sandia Natl Labs, Livermore, CA 94550 USA.
[Seidman, David N.] NUCAPT, Evanston, IL 60208 USA.
RP Knipling, KE (reprint author), USN, Res Lab, Multifunct Mat Branch, Washington, DC 20375 USA.
EM knipling@anvil.nrl.navy.mil
RI Seidman, David/B-6697-2009; Dunand, David/B-7515-2009; Karnesky,
Richard/D-1649-2010;
OI Karnesky, Richard/0000-0003-4717-457X; Dunand, David/0000-0001-5476-7379
FU US Department of Energy, Basic Sciences Division [DE-FG02-02ER45997,
DE-FG02-98ER45721]; NSF [DMR-0420532]; ONR-DURIP [N00014-0400798]
FX This research is supported by the US Department of Energy, Basic
Sciences Division, under contracts DE-FG02-02ER45997 and
DE-FG02-98ER45721. APT measurements were performed at the Northwestern
University Center for Atom-Probe Tomography (NUCAPT), using a LEAP
tomograph purchased with funding from the NSF-MRI (DMR-0420532, Dr.
Charles Bouldin, monitor) and ONR-DURIP (N00014-0400798, Dr. Julie
Christodoulou, monitor) programs. We are pleased to acknowledge Profs.
Morris Fine and Dieter Isheim (Northwestern University) for useful
discussions.
NR 96
TC 101
Z9 113
U1 5
U2 54
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD SEP
PY 2010
VL 58
IS 15
BP 5184
EP 5195
DI 10.1016/j.actamat.2010.05.054
PG 12
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 634HD
UT WOS:000280570500027
ER
PT J
AU Mullner, P
King, AH
AF Muellner, P.
King, A. H.
TI Deformation of hierarchically twinned martensite
SO ACTA MATERIALIA
LA English
DT Article
DE Shape-memory alloys (SMA); Disclinations; Twinning; Microstructure;
Martensitic phase transformation
ID SHAPE-MEMORY ALLOYS; PHASE-TRANSFORMATIONS; DISCLINATION MODELS; DOMAIN
PATTERN; MILD-STEEL; YBA2CU3O7-DELTA; INTERFACES; DEFECTS; JUNCTIONS;
CRYSTAL
AB Shape-memory alloys deform via the reorganization of a hierarchically twinned microstructure. Twin boundaries themselves present obstacles for twin boundary motion. In spite of a high density of obstacles, twinning stresses of Ni-Mn-Ga Heusler alloys are very low. Neither atomistic nor dislocation-based models account for such low yield stresses. Twinning mechanisms are studied here on a mesoscopic length scale making use of the disclination theory. In a first approach, a strictly periodic twin pattern containing periodic disclination walls with optimally screened stress fields is considered. Strict periodicity implies that the twin microstructure reorganizes homogeneously. In a second approach, a discontinuity of the fraction of secondary twins is introduced and modeled as a disclination dipole. The stress required for nucleation of this discontinuity is larger than the stress required for homogeneous reorganization. However, once the dipole is formed, it can move under a much smaller stress in agreement with experimental findings. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Muellner, P.] Boise State Univ, Dept Mat Sci & Engn, Boise, ID 83725 USA.
[King, A. H.] US DOE, Ames Lab, Ames, IA 50011 USA.
[King, A. H.] Iowa State Univ, Ames, IA 50011 USA.
RP Mullner, P (reprint author), Boise State Univ, Dept Mat Sci & Engn, Boise, ID 83725 USA.
EM PeterMullner@BoiseState.edu
RI King, Alexander/B-3148-2012; King, Alexander/P-6497-2015
OI King, Alexander/0000-0001-9677-3769; King, Alexander/0000-0001-7101-6585
FU US Department of Energy's Office of Basic Energy Sciences
[DEFG-02-07ER46396, DE-AC02-07CH11358]; Materials Sciences Division of
the Office of Basic Energy Sciences, in the Office of Science
FX The authors wish to thank R.C. Pond, D. Medlin and L. Lejcek for
providing content and permission to reprint the content of Figs. 11b, c
and 12a. We acknowledge the permission from the publisher to reproduce
pictures as follows: Fig. 2 [26]: from Acta Metallurgica 28, T. Saburi,
C.M. Wayman, K. Takata, S. Nenno, "The shape memory mechanism in 18R
martensite", Fig. 7 on p. 23, copyright 1980 by Elsevier, with
permission of Elsevier; Fig. 11a [8]: from Philosophical Magazine Ser.
7, 42, F.C. Frank, "Crystal dislocations - elementary concepts and
definitions", Fig. 4 on p. 819, copyright 1951 by Taylor & Francis, with
permission of Taylor & Francis; Fig. 11b [10]: from Acta Materialia 44,
J.P. Hirth and R.C. Pond, "Steps, dislocations and disconnections as
interface defects relating to structure and phase transformations", Fig.
4a on p. 4752, copyright 1996 by Elsevier, reprinted with permission of
Elsevier; Fig. 11c [50]: from Advances in Twinning, D. Medlin,
"Observation and modeling of 1/3 (1 1 1) twin dislocations in aluminum",
edited by S. Ankem and C.S. Pande, Fig. la on p. 30, copyright 1999 by
The Minerals, Metals & Materials Society (TMS) - Warrendale, PA, USA,
with permission of TMS; Fig. 12 [15,51]: from Konf Cs. Fyzika Olemeuc,
F. Kroupa and L. Lefeek, "Disclinations in crystals", Fig. 1 on p. 162,
copyright 1974 by Springer, with permission of Springer Science and
Business Media. P.M. acknowledges the US Department of Energy's Office
of Basic Energy Sciences for supporting the work at Boise State
University under contract DEFG-02-07ER46396. A.H.K. acknowledges the
support of the Ames Laboratory, which is operated by Iowa State
University of Science and Technology for the US Department of Energy
under contract No. DE-AC02-07CH11358. The work at Ames Laboratory was
supported by the Materials Sciences Division of the Office of Basic
Energy Sciences, in the Office of Science.
NR 65
TC 33
Z9 33
U1 6
U2 63
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD SEP
PY 2010
VL 58
IS 16
BP 5242
EP 5261
DI 10.1016/j.actamat.2010.05.048
PG 20
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 643SL
UT WOS:000281318900003
ER
PT J
AU Tan, Y
Shyam, A
Choi, WB
Lara-Curzio, E
Sampath, S
AF Tan, Y.
Shyam, A.
Choi, W. B.
Lara-Curzio, E.
Sampath, S.
TI Anisotropic elastic properties of thermal spray coatings determined via
resonant ultrasound spectroscopy
SO ACTA MATERIALIA
LA English
DT Article
DE Elastic properties; Thermal spray; Plasma spraying; Thermal barrier
coatings; Nickel
ID STABILIZED ZIRCONIA COATINGS; BARRIER COATINGS; MECHANICAL-PROPERTIES;
SPLAT FORMATION; YOUNGS MODULUS; POISSONS RATIO; MICROSTRUCTURAL
CHARACTERIZATION; RESIDUAL-STRESSES; BRITTLE MATERIALS; CERAMIC COATINGS
AB It is difficult to determine the elastic properties of thermal-sprayed ceramic and metallic coatings owing to the microstructural complexity, sample size and geometry, heterogeneity and availability of suitable techniques. Furthermore, the splat-based build-up of the coating results in transverse anisotropy in the elastic properties. This work reports on such anisotropic elastic properties of these coatings determined by resonant ultrasound spectroscopy. This approach, along with the analysis presented, enables the elastic properties to be determined for the first time as a function of direction and temperature, essential information for design. Coating systems investigated include plasma-sprayed yttria stabilized zirconia and nickel. An additional nickel coating deposited by the high-velocity oxygen-fuel process was also investigated and compared with the plasma-sprayed coating. Average Young's moduli of the coatings were independently measured by indentation. The elastic properties determined enabled the coating microstructure elastic property relationships to be described. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Tan, Y.; Choi, W. B.; Sampath, S.] SUNY Stony Brook, Dept Mat Sci & Engn, Ctr Thermal Spray Res, Stony Brook, NY 11794 USA.
[Shyam, A.; Lara-Curzio, E.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Sampath, S.] SUNY Stony Brook, Dept Mech Engn, Stony Brook, NY 11794 USA.
RP Tan, Y (reprint author), SUNY Stony Brook, Dept Mat Sci & Engn, Ctr Thermal Spray Res, Stony Brook, NY 11794 USA.
EM yangtan@gmail.com
OI Shyam, Amit/0000-0002-6722-4709
FU National Science Foundation [CMMI 0605704]; Assistant Secretary for
Energy Efficiency and Renewable Energy, Office of Transportation
Technologies; Department of Energy [DE-AC05000OR22725]
FX This work is supported by the GOALI-FRG program sponsored by National
Science Foundation under award CMMI 0605704. The work is in part
supported by the Assistant Secretary for Energy Efficiency and Renewable
Energy, Office of Transportation Technologies as part of the High
Temperature Materials Laboratory User Program at Oak Ridge National
Laboratory managed by the UT-Battelle LLC, for the Department of Energy
under contract DE-AC05000OR22725. The authors acknowledge Dr. Hsin Wang
(ORNL) and Dr. Sebastien Dryepondt (ORNL) for reviewing this manuscript.
NR 69
TC 21
Z9 23
U1 1
U2 23
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD SEP
PY 2010
VL 58
IS 16
BP 5305
EP 5315
DI 10.1016/j.actamat.2010.06.003
PG 11
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 643SL
UT WOS:000281318900008
ER
PT J
AU Anbusathaiah, V
Jesse, S
Arredondo, MA
Kartawidjaja, FC
Ovchinnikov, OS
Wang, J
Kalinin, SV
Nagarajan, V
AF Anbusathaiah, V.
Jesse, S.
Arredondo, M. A.
Kartawidjaja, F. C.
Ovchinnikov, O. S.
Wang, J.
Kalinin, S. V.
Nagarajan, V.
TI Ferroelastic domain wall dynamics in ferroelectric bilayers
SO ACTA MATERIALIA
LA English
DT Article
DE Ferroelectrics; Piezoelectrics; Switching spectroscopy PFM; Band
excitation piezoforce spectroscopy; Ferroelastic domains
ID THIN-FILMS; CERAMICS; HYSTERESIS; BEHAVIOR; STRESS
AB High-performance piezoelectric devices based on ferroelectric materials rely heavily on ferroelastic domain wall switching. Here we present visual evidence for the local mechanisms that underpin domain wall dynamics in ferroelastic nanodomains. State-of-the-art band excitation switching spectroscopy piezoforce microscopy (PFM) reveals distinct origins for the reversible and irreversible components of ferroelastic domain motion. Extrapolating the PFM images to case for uniform fields, we posit that, while reversible switching is essentially a linear motion of the ferroelastic domains, irreversible switching takes place via domain wall twists. Critically, real-time images of in situ domain dynamics under an external bias reveal that the reversible component leads to reduced coercive voltages. Finally, we show that junctions representing three-domain architecture represent facile interfaces for ferroelastic domain switching, and are likely responsible for irreversible processes in the uniform fields. The results presented here thus provide (hitherto missing) fundamental insight into the correlations between the physical mechanisms that govern ferroelastic domain behavior and the observed functional response in domain-engineered thin film ferroelectric devices. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Anbusathaiah, V.; Arredondo, M. A.; Nagarajan, V.] Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia.
[Jesse, S.; Kalinin, S. V.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37922 USA.
[Kartawidjaja, F. C.; Wang, J.] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 117576, Singapore.
[Ovchinnikov, O. S.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
RP Nagarajan, V (reprint author), Univ New S Wales, Sch Mat Sci & Engn, Sydney, NSW 2052, Australia.
EM nagarajan@unsw.edu.au
RI valanoor, nagarajan/B-4159-2012; Kalinin, Sergei/I-9096-2012; Jesse,
Stephen/D-3975-2016
OI Kalinin, Sergei/0000-0001-5354-6152; Jesse, Stephen/0000-0002-1168-8483
FU ARCNN; Scientific User Facilities Division, Office of Basic Energy
Sciences, US Department of Energy [CNMS2008-263]; Science and
Engineering Research Council - A*Star, Singapore [052 101 0047];
National University of Singapore; division of Scientific User
Facilities, US Department of Energy, through CNMS
FX The work at UNSW was supported by ARC Discovery and LIEF Grants. V.A.
acknowledges the ARCNN overseas travel grant to visit Oak Ridge National
Laboratory (ORNL). A portion of this research at the Center for
Nanophase Materials Sciences (CNMS), ORNL (under user proposal
CNMS2008-263) was sponsored by the Scientific User Facilities Division,
Office of Basic Energy Sciences, US Department of Energy. The work was
supported in part (S.J. and S.V.K.) by the division of Scientific User
Facilities, US Department of Energy, through CNMS. F.K. and J.W.
acknowledge the support of the Science and Engineering Research Council
- A*Star, Singapore, under Grant No. 052 101 0047, and the National
University of Singapore.
NR 35
TC 19
Z9 19
U1 0
U2 43
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
EI 1873-2453
J9 ACTA MATER
JI Acta Mater.
PD SEP
PY 2010
VL 58
IS 16
BP 5316
EP 5325
DI 10.1016/j.actamat.2010.06.004
PG 10
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 643SL
UT WOS:000281318900009
ER
PT J
AU Sugar, JD
McKeown, JT
Radmilovic, V
Glaeser, AM
Gronsky, R
AF Sugar, Joshua D.
McKeown, Joseph T.
Radmilovic, Velimir
Glaeser, Andreas M.
Gronsky, Ronald
TI Encapsulation-induced stabilization of dimensionally restricted metallic
alloy wires
SO ACTA MATERIALIA
LA English
DT Article
DE Energy filtered transmission electron microscopy; Wetting; Transmission
electron microscopy; Capillary phenomena; Spinodal decomposition
ID NI-FE ALLOYS; SURFACE FREE-ENERGY; MORPHOLOGICAL EVOLUTION; THIN-FILMS;
RAYLEIGH INSTABILITIES; SPINODAL DECOMPOSITION; EQUILIBRIUM SHAPE; PORE
CHANNELS; WULFF SHAPE; SAPPHIRE SURFACES
AB Compositionally modulated CuNiFe alloys wires were grown on sapphire substrates in two dimensionally restricted configurations, the first by dewetting thin films on crystallographically faceted free surfaces and the second by enclosure within lithographically sculpted cavities. Samples were annealed at elevated temperature to promote evolution towards chemical and morphological equilibrium. Surface wires of limited length resulted from the break-up of thin films along the long axes of substrate facets. Encapsulated wires oriented along specific crystallographic directions developed stable low energy facets along their lengths and resisted both dewetting and Rayleigh instabilities, enabling fabrication of stable, oriented, modulated (Cu/NiFe) structures. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Sugar, Joshua D.] Sandia Natl Labs, Dept Mat Phys, Livermore, CA 94550 USA.
[McKeown, Joseph T.] Arizona State Univ, Dept Phys, Tempe, AZ 85282 USA.
[Radmilovic, Velimir] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
[Sugar, Joshua D.; McKeown, Joseph T.; Glaeser, Andreas M.; Gronsky, Ronald] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
RP Sugar, JD (reprint author), Sandia Natl Labs, Dept Mat Phys, Livermore, CA 94550 USA.
EM jdsugar@sandia.gov
FU US Department of Energy [DE-FG02-02ER460008, DE-FG02-02ER45996,
DE-AC02-05CH11231, DE-AC04-94-AL85000]
FX The authors would like to thank the reviewer for thoughtful comments and
suggestions. This research was supported by the US Department of Energy
under contract Nos. DE-FG02-02ER460008 and DE-FG02-02ER45996. The
authors acknowledge the support of the staff and facilities at the
National Center for Electron Microscopy at Lawrence Berkeley National
Laboratory, funded by the US Department of Energy under contract No.
DE-AC02-05CH11231. Sandia is a multiprogram laboratory operated by
Sandia Corporation, a Lockheed Martin Co., for the US Department of
Energy under contract no. DE-AC04-94-AL85000.
NR 75
TC 1
Z9 1
U1 1
U2 11
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD SEP
PY 2010
VL 58
IS 16
BP 5332
EP 5341
DI 10.1016/j.actamat.2010.06.008
PG 10
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 643SL
UT WOS:000281318900011
ER
PT J
AU McCabe, RJ
Capolungo, L
Marshall, PE
Cady, CM
Tome, CN
AF McCabe, R. J.
Capolungo, L.
Marshall, P. E.
Cady, C. M.
Tome, C. N.
TI Deformation of wrought uranium: Experiments and modeling
SO ACTA MATERIALIA
LA English
DT Article
DE Twinning; Electron backscatter diffraction; Micromechanical modeling;
Texture; Optical imaging microscopy
ID ELECTRON BACKSCATTER DIFFRACTION; ALPHA-URANIUM; HARDENING EVOLUTION;
HEXAGONAL MATERIALS; TWIN STATISTICS; TEMPERATURE; ZIRCONIUM; MAGNESIUM;
TEXTURE; POLYCRYSTALS
AB The room temperature deformation behavior of wrought polycrystalline uranium is studied using a combination of experimental techniques and polycrystal modeling. Electron backscatter diffraction is used to analyze the primary deformation twinning modes for wrought alpha-uranium. The {1 3 0} < 3 1 0 > twinning mode is found to be the most prominent twinning mode, with minor contributions from the '{1 7 2}'< 3 1 2 > and {1 1 2}'<(3 72 >' twin modes. Because of the large number of deformation modes, each with limited deformation systems, a polycrystalline model is employed to identify and quantify the activity of each mode. Model predictions of the deformation behavior and texture development agree reasonably well with experimental measures and provide reliable information about deformation systems. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [McCabe, R. J.; Capolungo, L.; Marshall, P. E.; Cady, C. M.; Tome, C. N.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
[Capolungo, L.] CNRS, UMI Georgia Tech 2958, F-57070 Metz, France.
RP McCabe, RJ (reprint author), Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
EM rmccabe@lanl.gov
RI Tome, Carlos/D-5058-2013
OI McCabe, Rodney /0000-0002-6684-7410;
FU US Department of Energy [DE-AC52-06NA25396]
FX This work has benefited from the use of the electron microscopy
laboratory (EML) at Los Alamos. The authors wish to thank Ann Kelly for
metallographic assistance, Mike Lopez for providing the compression
specimens and performing some of the mechanical tests, and Donald Brown
for providing the tension specimens and performing some of the
mechanical tests. This work was performed under contract number
DE-AC52-06NA25396 with the US Department of Energy.
NR 32
TC 16
Z9 16
U1 0
U2 12
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD SEP
PY 2010
VL 58
IS 16
BP 5447
EP 5459
DI 10.1016/j.actamat.2010.06.021
PG 13
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 643SL
UT WOS:000281318900023
ER
PT J
AU Mottola, E
AF Mottola, Emil
TI NEW HORIZONS IN GRAVITY: THE TRACE ANOMALY, DARK ENERGY AND CONDENSATE
STARS
SO ACTA PHYSICA POLONICA B
LA English
DT Article
ID QUANTUM-FIELD-THEORY; BLACK-HOLE ENTROPY; ISOTROPIC COSMOLOGICAL MODELS;
CLASSICAL GENERAL-RELATIVITY; CONFORMALLY FLAT SPACETIMES; GRAVITATIONAL
BACK-REACTION; STRONG ELECTRIC-FIELD; DE-SITTER SPACE; MOMENTUM-TENSOR;
DESITTER SPACE
AB General Relativity receives quantum corrections relevant at macroscopic distance scales and near event horizons. These arise from the conformal scalar degrees of freedom in the extended effective field theory of gravity generated by the trace anomaly of massless quantum fields in curved space. The origin of these conformal scalar degrees of freedom as massless poles in two-particle intermediate states of anomalous amplitudes in flat space is exposed. These are non-local quantum pair correlated states, not present in the classical theory. At event horizons the conformal anomaly scalar degrees of freedom can have macroscopically large effects on the geometry, potentially removing the classical event horizon of black hole and cosmological spacetimes, replacing them with a quantum boundary layer where the effective value of the gravitational vacuum energy density can change. In the effective theory, the cosmological term becomes a dynamical condensate, whose value depends upon boundary conditions near the horizon. In the conformal phase where the anomaly induced fluctuations dominate, and the condensate dissolves, the effective cosmological "constant" is a running coupling which has an infrared stable fixed point at zero. By taking a positive value in the interior of a fully collapsed star, the effective cosmological term removes any singularity, replacing it with a smooth dark energy interior. The resulting gravitational condensate star configuration resolves all black hole paradoxes, and provides a testable alternative to black holes as the final state of complete gravitational collapse. The observed dark energy of our universe likewise may be a macroscopic finite size effect whose value depends not on microphysics but on the cosmological horizon scale. The physical arguments and detailed calculations involving the trace anomaly effective action, auxiliary scalar fields and stress tensor in various situations and backgrounds supporting this hypothesis are reviewed. Originally delivered as a series of lectures at the Krakow School, the paper is pedagogical in style, and wide ranging in scope, collecting and presenting a broad spectrum of results on black holes, the trace anomaly, and quantum effects in cosmology.
C1 [Mottola, Emil] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Mottola, Emil] CERN, PH TH, Theoret Phys Grp, CH-1211 Geneva 23, Switzerland.
RP Mottola, E (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
EM emil@lanl.gov
NR 242
TC 29
Z9 29
U1 1
U2 2
PU JAGIELLONIAN UNIV PRESS
PI KRAKOW
PA UL MICHALOWSKIEGO 9-2, KRAKOW, 31126, POLAND
SN 0587-4254
EI 1509-5770
J9 ACTA PHYS POL B
JI Acta Phys. Pol. B
PD SEP
PY 2010
VL 41
IS 9
BP 2031
EP 2162
PG 132
WC Physics, Multidisciplinary
SC Physics
GA 660TC
UT WOS:000282666300003
ER
PT J
AU Wang, YD
Liu, WJ
Lu, L
Ren, Y
Nie, ZH
Almer, J
Cheng, S
Shen, YF
Zuo, LA
Liaw, PK
Lu, K
AF Wang, Yan-Dong
Liu, Wenjun
Lu, Lei
Ren, Yang
Nie, Zhi-Hua
Almer, Jonathan
Cheng, Sheng
Shen, Yong-Feng
Zuo, Liang
Liaw, Peter K.
Lu, Ke
TI Low Temperature Deformation Detwinning-A Reverse Mode of Twinning
SO ADVANCED ENGINEERING MATERIALS
LA English
DT Article
ID NANOCRYSTALLINE METALS; ULTRAHIGH-STRENGTH; GRAIN-BOUNDARIES; RATE
SENSITIVITY; COPPER; DISLOCATION; PLASTICITY; MICROSCOPY; MAXIMUM;
GROWTH
AB The origin of the plasticity in bulk nanocrystalline metals have, to date, been attributed to the grain-boundary-mediated process, stress-induced grain coalescence, dislocation plasticity, and/or twinning. Here we report a different mechanism-detwinning, which operates at low temperatures during the tensile deformation of an electrodeposited Cu with a high density of nanosized growth twins. Both three-dimensional XRD microscopy using the Laue method with a submicron-sized polychromatic beam and high-energy XRD technique with a monochromatic beam provide the direct experimental evidences for low temperature detwinning of nanoscale twins.
C1 [Wang, Yan-Dong; Nie, Zhi-Hua] Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China.
[Liu, Wenjun; Ren, Yang; Almer, Jonathan] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
[Lu, Lei; Lu, Ke] Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China.
[Cheng, Sheng; Liaw, Peter K.] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
[Shen, Yong-Feng; Zuo, Liang] 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; wjliu@anl.gov; pliaw@utk.edu
RI Lu, Lei/E-3864-2012; Cheng, Sheng/D-9153-2013; Nie, Zhihua/G-9459-2013;
ran, shi/G-9380-2013; wang, yandong/G-9404-2013
OI Cheng, Sheng/0000-0003-1137-1926; Nie, Zhihua/0000-0002-2533-933X;
FU National Natural Science Foundation of China [50725102]; Ministry of
Education of China; National Science Foundation [DMR-0231320]; US
Department of Energy, Office of Science, Office of Basic Energy Sciences
[DE-AC02-06CH11357]
FX This work is supported by the National Natural Science Foundation of
China (grant no. 50725102) and the Ministry of Education of China. SC
and PKL are very grateful to the support of the National Science
Foundation International Materials Institutes (IMI) Program
(DMR-0231320). 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.
NR 32
TC 15
Z9 15
U1 7
U2 40
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA POSTFACH 101161, 69451 WEINHEIM, GERMANY
SN 1438-1656
EI 1527-2648
J9 ADV ENG MATER
JI Adv. Eng. Mater.
PD SEP
PY 2010
VL 12
IS 9
SI SI
BP 906
EP 911
DI 10.1002/adem.201000123
PG 6
WC Materials Science, Multidisciplinary
SC Materials Science
GA 677ML
UT WOS:000283996400031
ER
PT J
AU Luther, JM
Gao, JB
Lloyd, MT
Semonin, OE
Beard, MC
Nozik, AJ
AF Luther, Joseph M.
Gao, Jianbo
Lloyd, Matthew T.
Semonin, Octavi E.
Beard, Matthew C.
Nozik, Arthur J.
TI Stability Assessment on a 3% Bilayer PbS/ZnO Quantum Dot Heterojunction
Solar Cell
SO ADVANCED MATERIALS
LA English
DT Article
ID PBSE NANOCRYSTAL SOLIDS; ELECTRICAL-PROPERTIES; AIR; PHOTOVOLTAICS;
CONFINEMENT; DEVICES; FILMS
AB We provide the first NREL-certified efficiency measurement on an all-inorganic, solution-processed, nanocrystal solar cell. The 3% efficient device is composed of ZnO nanocrystals and 1.3 eV PbS quantum dots with gold as the top contact. This configuration yields a stable device, retaining 95% of the starting efficiency after a 1000-hour light soak in air without encapsulation.
C1 [Luther, Joseph M.; Gao, Jianbo; Lloyd, Matthew T.; Semonin, Octavi E.; Beard, Matthew C.; Nozik, Arthur J.] Natl Renewable Energy Lab, Golden, CO 80401 USA.
[Gao, Jianbo] Univ Toledo, Toledo, OH 43606 USA.
[Semonin, Octavi E.; Nozik, Arthur J.] Univ Colorado, Boulder, CO 80309 USA.
RP Luther, JM (reprint author), Natl Renewable Energy Lab, 1617 Cole Blvd, Golden, CO 80401 USA.
EM joey.luther@nrel.gov
RI GAO, JIANBO/A-1633-2014; Nozik, Arthur/A-1481-2012; Nozik,
Arthur/P-2641-2016; GAO, JIANBO/A-3923-2011
OI Semonin, Octavi Escala/0000-0002-4262-6955; BEARD,
MATTHEW/0000-0002-2711-1355;
FU Center for Advanced Solar Photophysics; US Department of Energy, Office
of Science, Office of Basic Energy Sciences; National Center for
Photovoltaics; EERE of the Department of Energy; DOE [DE-AC36-08GO28308]
FX We thank Matt Law and Randy Ellingson for helpful suggestions. JML, OES,
AJN were supported by the Center for Advanced Solar Photophysics, an
Energy Frontier Research Center funded by US Department of Energy,
Office of Science, Office of Basic Energy Sciences. MTL acknowledges
funding from the National Center for Photovoltaics. JG and MCB
acknowledge funding from the seed program of EERE of the Department of
Energy. DOE funding was provided to NREL through contract
DE-AC36-08GO28308.
NR 32
TC 219
Z9 226
U1 11
U2 137
PU WILEY-V C H VERLAG GMBH
PI WEINHEIM
PA PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY
SN 0935-9648
J9 ADV MATER
JI Adv. Mater.
PD SEP 1
PY 2010
VL 22
IS 33
BP 3704
EP +
DI 10.1002/adma.201001148
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 654IO
UT WOS:000282161900013
PM 20533423
ER
PT J
AU Wagner, JL
Yuceil, KB
Clemens, NT
AF Wagner, J. L.
Yuceil, K. B.
Clemens, N. T.
TI Velocimetry Measurements of Unstart in an Inlet-Isolator Model in Mach 5
Flow
SO AIAA JOURNAL
LA English
DT Article; Proceedings Paper
CT AIAA 39th Fluid Dynamics Conference
CY JUN 22-25, 2009
CL San Antonio, TX
SP AIAA
ID PARTICLE IMAGE VELOCIMETRY; BOUNDARY-LAYER; SCRAMJET; PERFORMANCE;
ENGINES
AB The dynamics of unstart in a floor-mounted inlet-isolator model in a Mach 5 flow are investigated experimentally using particle image velocimetry and fast-response wall pressure measurements. The inlet compression is obtained with a 6-deg ramp and the isolator is a rectangular straight duct that is 25.4 nun high by 50.8 min wide by 242.3 nun long. Unstart is initiated from the scramjet mode (fully supersonic in the isolator) by deflecting a motorized flap at the downstream end of the isolator. With the flap fully down, the particle image velocimetry data of the started flow capture the characteristics of the isolator boundary layers and the initial inlet reflected shock system. During unstart. the unstart shock system propagates upstream through the inlet-isolator. The particle image velocimetry (lath reveal a complex, three-dimensional flow structure that is strongly dependent on viscous mechanisms. Particularly., the unstart shock system propagates upstream and induces significant boundary-layer separation. Side-view particle image velocimetry data show that the locations of strongest separation during unstart correlate with the impingement locations of the initial inlet shock as it reflects down the isolator. For example. in the middle of [install, the unstart shock system is associated with massive separation of the ceiling boundary layer that begins where the first inlet shock reflection impinges on the ceiling. The observation that separation increases at the inlet shock reflection impingement locations is likely due to the fact that the boundary layers in these locations are subject to larger adverse pressure gradients. thus making them more susceptible to separation. During the unstart princess, large regions of separated flow form near the floor and ceiling with reverse flow velocities up to about 0.4U(infinity). These regions of separated. subsonic flow appear to extend to the isolator exit, creating a path by which the isolator exit boundary condition can be communicated upstream. Plan-view particle image velocimetry data show the unstart process begins with separation of the isolator sidewall boundary layers. Overall, the unstart flow structure is highly three-dimensional.
C1 [Wagner, J. L.; Clemens, N. T.] Univ Texas Austin, Ctr Aeromech Res, Dept Aerosp Engn & Engn Mech, Austin, TX 78712 USA.
[Yuceil, K. B.] Istanbul Tech Univ, Dept Astronaut Engn, Fac Aeronaut & Astronaut, TR-34469 Istanbul, Turkey.
RP Wagner, JL (reprint author), Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA.
RI Yuceil, Kemal/A-4767-2015
NR 42
TC 17
Z9 22
U1 1
U2 12
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0001-1452
J9 AIAA J
JI AIAA J.
PD SEP
PY 2010
VL 48
IS 9
BP 1875
EP 1888
DI 10.2514/1.J050037
PG 14
WC Engineering, Aerospace
SC Engineering
GA 646NK
UT WOS:000281548100003
ER
PT J
AU Griffith, DT
AF Griffith, D. Todd
TI Analytical Sensitivities of Principal Components in Time-Series Analysis
of Dynamical Systems
SO AIAA JOURNAL
LA English
DT Article; Proceedings Paper
CT AIAA/ASME/ASCE/AHS/ASC 50th Structures, Structural Dynamics and
Materials Conference
CY MAY 02-07, 2009
CL Palm Springs, CA
SP Amer Inst Aeronaut & Astronaut, ASME, ASCE, AHS, ASC
ID SINGULAR-VALUE DECOMPOSITION; PROPER ORTHOGONAL MODES; EIGENVECTOR
DERIVATIVES; PHYSICAL INTERPRETATION; 2ND-ORDER
AB Principal components analysis, which is also referred to as proper orthogonal decomposition in the literature. is a useful technique in many fields of engineering, science, and mathematics for analysis of time-series data. The benefit of principal components analysis for dynamical systems comes from its ability to detect and rank the dominant coherent spatial structures of dynamic response, such as operating deflection shapes or mode shapes. In this work, an original method for calculating the analytical sensitivities of the principal components of dynamical systems is developed. Methods for analytical sensitivity calculations are developed for both the singular-value decomposition and eigenanalysis-based approaches for principal component calculation. Sensitivities with respect to state initial conditions and system parameters are enabled by state transition matrix calculations for augmented state and parameter differential equations. A novel approach to compute principal component sensitivities with respect to transient forcing-function parameters is introduced by transforming nonhomogenous differential equations (forced system) into homogenous differential equations (unforced system). These new developments are applied to several example problems in dynamics analysis, with an emphasis on structural dynamics analysis. Analytical sensitivities provide the necessary derivatives for gradient-based optimization algorithms and provide an analytical framework for evaluating structural modifications based on principal components analysis.
C1 Sandia Natl Labs, Analyt Struct Dynam Dept, Albuquerque, NM 87185 USA.
RP Griffith, DT (reprint author), Sandia Natl Labs, Analyt Struct Dynam Dept, Mail Stop 0557, Albuquerque, NM 87185 USA.
RI Griffith, Daniel/C-2807-2014
OI Griffith, Daniel/0000-0002-7767-3700
NR 21
TC 0
Z9 0
U1 0
U2 0
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0001-1452
J9 AIAA J
JI AIAA J.
PD SEP
PY 2010
VL 48
IS 9
BP 2099
EP 2110
DI 10.2514/1.J050293
PG 12
WC Engineering, Aerospace
SC Engineering
GA 646NK
UT WOS:000281548100020
ER
PT J
AU Galindo, S
Galindo, D
AF Galindo, Salvador
Galindo, Diego
TI An 18th century glow discharge experiment to model an aurora
SO AMERICAN JOURNAL OF PHYSICS
LA English
DT Article
AB We discuss an experiment first performed in 1789 designed to reproduce the glow of an aurora. The experiment was partially based on ideas of Benjamin Franklin. (C) 2010 American Association of Physics Teachers. [DOI: 10.1119/1.3431563]
C1 [Galindo, Salvador] Inst Nacl Invest Nucl, Mexico City 52750, DF, Mexico.
[Galindo, Diego] Oak Ridge Natl Lab, Div Math & Comp Sci, Oak Ridge, TN 37831 USA.
RP Galindo, S (reprint author), Inst Nacl Invest Nucl, Km 36 1-2 Carretera Mexico Toluca, Mexico City 52750, DF, Mexico.
NR 16
TC 0
Z9 0
U1 1
U2 4
PU AMER ASSOC PHYSICS TEACHERS AMER INST PHYSICS
PI MELVILLE
PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
SN 0002-9505
J9 AM J PHYS
JI Am. J. Phys.
PD SEP
PY 2010
VL 78
IS 9
BP 902
EP 904
DI 10.1119/1.3431563
PG 3
WC Education, Scientific Disciplines; Physics, Multidisciplinary
SC Education & Educational Research; Physics
GA 637OZ
UT WOS:000280829100003
ER
PT J
AU Ditmire, T
AF Ditmire, Todd
TI High-power Lasers The invention of the laser 50 years ago has led to the
latest generation of devices, with power bursts thousands of times that
of the nation's entire electrical grid
SO AMERICAN SCIENTIST
LA English
DT Article
ID PULSES; RUBY
C1 [Ditmire, Todd] Univ Texas Austin, Dept Phys, Texas Ctr High Intens Laser Sci, Austin, TX 78712 USA.
[Ditmire, Todd] Univ Texas Austin, Texas Petawatt Project, Austin, TX 78712 USA.
[Ditmire, Todd] Lawrence Livermore Natl Lab, Livermore, CA USA.
RP Ditmire, T (reprint author), Univ Texas Austin, Dept Phys, Texas Ctr High Intens Laser Sci, Mail Stop C1600, Austin, TX 78712 USA.
EM tditmire@physics.utexas.edu
NR 11
TC 2
Z9 2
U1 0
U2 2
PU SIGMA XI-SCI RES SOC
PI RES TRIANGLE PK
PA PO BOX 13975, RES TRIANGLE PK, NC 27709 USA
SN 0003-0996
J9 AM SCI
JI Am. Scientist
PD SEP-OCT
PY 2010
VL 98
IS 5
BP 394
EP 401
PG 8
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 640IW
UT WOS:000281045900020
ER
PT J
AU Rana, GSJB
York, TP
Edmiston, JS
Zedler, BK
Pounds, JG
Adkins, JN
Varnum, SM
Smith, RD
Liu, ZG
Li, GY
Webb, BT
Murrelle, EL
Flora, JW
AF Rana, Gaurav S. J. B.
York, Timothy P.
Edmiston, Jeffery S.
Zedler, Barbara K.
Pounds, Joel G.
Adkins, Joshua N.
Varnum, Susan M.
Smith, Richard D.
Liu, Zaigang
Li, Guoya
Webb, Bradley T.
Murrelle, Edward L.
Flora, Jason W.
TI Proteomic biomarkers in plasma that differentiate rapid and slow decline
in lung function in adult cigarette smokers with chronic obstructive
pulmonary disease (COPD) (vol 397, pg 1809, 2010)
SO ANALYTICAL AND BIOANALYTICAL CHEMISTRY
LA English
DT Correction
C1 [Rana, Gaurav S. J. B.; Edmiston, Jeffery S.; Zedler, Barbara K.; Liu, Zaigang; Li, Guoya; Murrelle, Edward L.; Flora, Jason W.] Altria Client Serv, Richmond, VA 23219 USA.
[York, Timothy P.; Webb, Bradley T.] Virginia Commonwealth Univ, Sch Med, Dept Human & Mol Genet, Inst Biomarker Discovery & Personalized Med, Richmond, VA 23219 USA.
[York, Timothy P.; Webb, Bradley T.] Virginia Commonwealth Univ, Sch Med, Dept Pharm, Inst Biomarker Discovery & Personalized Med, Richmond, VA 23219 USA.
[Pounds, Joel G.; Adkins, Joshua N.; Varnum, Susan M.; Smith, Richard D.] Pacific NW Natl Lab, Div Biol Sci, Richland, WA 99352 USA.
RP Flora, JW (reprint author), Altria Client Serv, 601 E Jackson St, Richmond, VA 23219 USA.
EM Jason.W.Flora@Altria.com
RI Smith, Richard/J-3664-2012; Adkins, Joshua/B-9881-2013
OI Smith, Richard/0000-0002-2381-2349; Adkins, Joshua/0000-0003-0399-0700
NR 1
TC 0
Z9 0
U1 0
U2 3
PU SPRINGER HEIDELBERG
PI HEIDELBERG
PA TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY
SN 1618-2642
J9 ANAL BIOANAL CHEM
JI Anal. Bioanal. Chem.
PD SEP
PY 2010
VL 398
IS 2
BP 1133
EP 1133
DI 10.1007/s00216-010-4002-3
PG 1
WC Biochemical Research Methods; Chemistry, Analytical
SC Biochemistry & Molecular Biology; Chemistry
GA 650IL
UT WOS:000281842400050
ER
PT J
AU Liu, MA
Hou, JX
Huang, L
Huang, X
Heibeck, TH
Zhao, R
Pasa-Tolic, L
Smith, RD
Li, Y
Fu, K
Zhang, ZX
Hinrichs, SH
Ding, SJ
AF Liu, Miao
Hou, Jinxuan
Huang, Lin
Huang, Xin
Heibeck, Tyler H.
Zhao, Rui
Pasa-Tolic, Ljiljana
Smith, Richard D.
Li, Yan
Fu, Kai
Zhang, Zhixin
Hinrichs, Steven H.
Ding, Shi-Jian
TI Site-Specific Proteomics Approach for Study Protein S-Nitrosylation
SO ANALYTICAL CHEMISTRY
LA English
DT Article
ID NITRIC-OXIDE SYNTHASE; TUMOR ANGIOGENESIS; MASS-SPECTROMETRY;
BREAST-CANCER; CELL-DEATH; IDENTIFICATION; NO; NITROSOTHIOLS;
DECOMPOSITION; INHIBITION
AB Here we present a novel and robust method for the identification of protein S-nitrosylation sites in complex protein mixtures. The approach utilizes the cysteinyl affinity resin to selectively enrich S-nitrosylated peptides reduced by ascorbate followed by nanoscale liquid chromatography tandem mass spectrometry. Two alkylation agents with different added masses were employed to differentiate the S-nitrosylation sites from the non-S-nitrosylation sites. We applied this approach to MDA-MB-231 cells treated with Angeli's salt, a nitric oxide donor that has been shown to inhibit breast tumor growth and angiogenesis. A total of 162 S-nitrosylation sites were identified and an S-nitrosylation motif was revealed in our study. The 162 sites are significantly more than the number reported by previous methods, demonstrating the efficiency of our approach. Our approach will further facilitate the functional study of protein S-nitrosylation in cellular processes and may reveal new therapeutic targets.
C1 [Liu, Miao; Hou, Jinxuan; Huang, Lin; Huang, Xin; Fu, Kai; Zhang, Zhixin; Hinrichs, Steven H.; Ding, Shi-Jian] Univ Nebraska Med Ctr, Mass Spectrometry & Prote Core Facil, Dept Pathol & Microbiol, Omaha, NE 68198 USA.
[Hou, Jinxuan; Li, Yan] Zhongnan Hosp, Dept Oncol, Wuhan 430071, Hubei Province, Peoples R China.
[Heibeck, Tyler H.; Zhao, Rui; Pasa-Tolic, Ljiljana; Smith, Richard D.] Pacific NW Natl Lab, Environm Mol Sci Lab, Div Biol Sci, Richland, WA 99135 USA.
RP Ding, SJ (reprint author), Univ Nebraska Med Ctr, Mass Spectrometry & Prote Core Facil, Dept Pathol & Microbiol, Omaha, NE 68198 USA.
EM dings@unmc.edu
RI Smith, Richard/J-3664-2012; Huang, Xin/P-8103-2014;
OI Smith, Richard/0000-0002-2381-2349; Huang, Xin/0000-0001-6778-8849;
Heibeck, Tyler/0000-0002-9507-2896
FU Environmental Molecular Sciences Laboratory; Department of Energy's
Office of Biological and Environmental Research at Pacific Northwest
National Laboratory; Department of Pathology and Microbiology at the
University of Nebraska Medical Center
FX We thank Dr. Lawrence Schopfer for the critical reading of the
manuscript and Dr. Jixin Dong for providing the MDA-MB-231 cell line.
The MS data was acquired at the Mass Spectrometry and Proteomics Core
Facility at the University of Nebraska Medical Center. The construction
of a nanoLC system was partially supported by the 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 Pacific Northwest National
Laboratory. This work was financially supported by the Department of
Pathology and Microbiology at the University of Nebraska Medical Center.
NR 50
TC 34
Z9 37
U1 1
U2 8
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0003-2700
J9 ANAL CHEM
JI Anal. Chem.
PD SEP 1
PY 2010
VL 82
IS 17
BP 7160
EP 7168
DI 10.1021/ac100569d
PG 9
WC Chemistry, Analytical
SC Chemistry
GA 643OI
UT WOS:000281306000018
PM 20687582
ER
PT J
AU Cao, Q
Xu, Y
Liu, F
Svec, F
Frechet, JMJ
AF Cao, Qing
Xu, Yan
Liu, Feng
Svec, Frantisek
Frechet, Jean M. J.
TI Polymer Monoliths with Exchangeable Chemistries: Use of Gold
Nanoparticles As Intermediate Ligands for Capillary Columns with Varying
Surface Functionalities
SO ANALYTICAL CHEMISTRY
LA English
DT Article
ID PERFORMANCE LIQUID-CHROMATOGRAPHY; IONIZATION MASS-SPECTROMETRY; TUBULAR
GAS-CHROMATOGRAPHY; HIGH-FLOW CHARACTERISTICS; DOUBLE-STRANDED DNA;
STATIONARY PHASES; POROUS PROPERTIES; SEPARATION MEDIUM; MACROPOROUS
POLYMERS; ION CHROMATOGRAPHY
AB Newly developed porous polymer monolithic capillary columns modified with gold nanoparticles coated with exchangeable functionalities allow easy switching of separation modes by a simple ligand exchange process. These columns are prepared from a poly(glycidyl methacrylate-co-ethylene dimethacrylate) monolith through reaction of its epoxide moieties with cysteamine to afford a monolith rich in surface thiol groups. Gold nanoparticles prepared via in situ reduction of chloroauric acid within the column become attached to the surface of the pores of the monolith. Alternatively, a solution of colloidal gold nanoparticles can be pumped through the thiol modified column to achieve their attachment. While the first approach is faster, it affords a lower coverage of nanoparticles than the second method, while both methods preserve the excellent hydrodynamic properties that are typical of the monolithic columns. Functionalization of the surface of the bound gold nanoparticles is then carried out using low molecular weight thiol-containing surface ligands. The dynamic nature of the bond between gold and these surface ligands enables the replacement of one surface ligand by another through a simple solution exchange process. This novel approach expands the application range of monoliths as a single column can now be used in different separations modes. Applications of the columns with exchangeable chemistries are demonstrated with the capillary electrochromatographic separation of peptides and the nano-high-pressure liquid chromatography (HPLC) separation of proteins in both reversed phase and ion exchange modes.
C1 [Svec, Frantisek; Frechet, Jean M. J.] EO Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA.
[Cao, Qing; Xu, Yan; Svec, Frantisek; Frechet, Jean M. J.] Univ Calif Berkeley, Coll Chem, Berkeley, CA 94720 USA.
[Cao, Qing; Liu, Feng] Peking Univ, Coll Chem, Key Lab Bioorgan Chem & Mol Engn, Beijing Natl Lab Mol Sci,Minist Educ, Beijing 100871, Peoples R China.
RP Frechet, JMJ (reprint author), EO Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA 94720 USA.
EM frechet@berkeley.edu
OI Frechet, Jean /0000-0001-6419-0163
FU National Institute of Health [GM48364]; Office of Science, Office of
Basic Energy Sciences, Materials Sciences and Engineering Division of
the U.S. Department of Energy [DE-AC02-05CH11231]; China Scholarship
Council (Ministry of Education of China)
FX Support of Y.X. and J.M.J.F, by a grant of the National Institute of
Health (Grant GM48364) is gratefully acknowledged. F.S. and the
experimental work performed at the Molecular Foundry, Lawrence Berkeley
National Laboratory were 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. Financial support of Q.C. by the China Scholarship
Council (Ministry of Education of China) is also acknowledged.
NR 67
TC 95
Z9 98
U1 11
U2 121
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0003-2700
EI 1520-6882
J9 ANAL CHEM
JI Anal. Chem.
PD SEP 1
PY 2010
VL 82
IS 17
BP 7416
EP 7421
DI 10.1021/ac1015613
PG 6
WC Chemistry, Analytical
SC Chemistry
GA 643OI
UT WOS:000281306000050
PM 20681590
ER
PT J
AU Gasper, GL
Takahashi, LK
Zhou, J
Ahmed, M
Moore, JF
Hanley, L
AF Gasper, Gerald L.
Takahashi, Lynelle K.
Zhou, Jia
Ahmed, Musahid
Moore, Jerry F.
Hanley, Luke
TI Laser Desorption Postionization Mass Spectrometry of Antibiotic-Treated
Bacterial Biofilms Using Tunable Vacuum Ultraviolet Radiation
SO ANALYTICAL CHEMISTRY
LA English
DT Article
ID SINGLE-PHOTON IONIZATION; STAPHYLOCOCCUS-EPIDERMIDIS; SECONDARY-ION;
PHOTOIONIZATION; ABLATION; PENETRATION; DYNAMICS; MATRIX; LIGHT; WALL
AB Laser desorption postionization mass spectrometry (LDPI-MS) with 8.0-12.5 eV vacuum ultraviolet synchrotron radiation is used to single photon ionize antibiotics and extracellular neutrals that are laser desorbed both from neat and intact bacterial biofilms. Neat antibiotics are optimally detected using 10.5 eV LDPI-MS but can be ionized using 8.0 eV radiation, in agreement with prior work using 7.87 eV LDPI-MS. Tunable vacuum ultraviolet radiation also postionizes laser desorbed neutrals of antibiotics and extracellular material from within intact bacterial biofilms. Different extracellular material is observed by LDPI-MS in response to rifampicin or trimethoprim antibiotic treatment. Once again, 10.5 eV LDPI-MS displays the optimum trade-off between improved sensitivity and minimum fragmentation. Higher energy photons at 12.5 eV produce significant parent ion signal, but fragment intensity and other low mass ions are also enhanced. No matrix is added to enhance desorption, which is performed at peak power densities insufficient to directly produce ions, thus allowing observation of true VUV postionization mass spectra of antibiotic treated biofilms.
C1 [Gasper, Gerald L.; Hanley, Luke] Univ Illinois, Dept Chem, Chicago, IL 60607 USA.
[Takahashi, Lynelle K.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Takahashi, Lynelle K.; Zhou, Jia; Ahmed, Musahid] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Berkeley, CA 94720 USA.
[Moore, Jerry F.] MassThink, Naperville, IL 60563 USA.
RP Hanley, L (reprint author), Univ Illinois, Dept Chem, Chicago, IL 60607 USA.
EM lhanley@uic.edu
RI Ahmed, Musahid/A-8733-2009
FU National Institute of Biomedical Imaging and Bioengineering [EB006532];
Office of Energy Research, Office of Basic Energy Sciences, Chemical
Sciences Division of the U.S. Department of Energy [DE-AC02-05CH11231]
FX The authors acknowledge their ongoing collaboration with Ross Carlson of
the Center for Biofilm Engineering at Montana State University (Bozeman,
MT), who has freely provided his invaluable expertise on bacterial
biofilms. This work is supported by the National Institute of Biomedical
Imaging and Bioengineering via Grant EB006532. M.A., L.K.T., and J.Z.
and the Advanced Light Source (ALS) are supported by the Director,
Office of Energy Research, Office of Basic Energy Sciences, Chemical
Sciences Division of the U.S. Department of Energy under Contract No.
DE-AC02-05CH11231. The contents of this manuscript are solely the
responsibility of the authors and do not necessarily represent the
official views of the National Institute of Biomedical Imaging and
Bioengineering or the National Institutes of Health.
NR 39
TC 23
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U1 2
U2 24
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0003-2700
J9 ANAL CHEM
JI Anal. Chem.
PD SEP 1
PY 2010
VL 82
IS 17
BP 7472
EP 7478
DI 10.1021/ac101667q
PG 7
WC Chemistry, Analytical
SC Chemistry
GA 643OI
UT WOS:000281306000058
PM 20712373
ER
PT J
AU Sato, H
Johnson, R
Schultz, R
AF Sato, Hiroyuki
Johnson, Richard
Schultz, Richard
TI Computational fluid dynamic analysis of core bypass flow phenomena in a
prismatic VHTR
SO ANNALS OF NUCLEAR ENERGY
LA English
DT Article
DE Core bypass flow; Prismatic; VHTR; CFD; FLUENT; Maximum fuel temperature
ID HEAT-TRANSFER; TEMPERATURE; VELOCITY
AB The core bypass flow in a prismatic very high temperature reactor (VHTR) is an important design consideration and can have considerable impact on the condition of reactor core internals including fuels. The interstitial gaps are an inherent presence in the reactor core because of tolerances in manufacturing the blocks and the inexact nature of their installation. Furthermore, the geometry of the graphite blocks changes over the lifetime of the reactor because of thermal expansion and irradiation damage. The occurrence of hot spots in the core and lower plenum and hot streaking in the lower plenum (regions of very hot gas flow) are affected by bypass flow.
In the present study, three-dimensional computational fluid dynamic (CFD) calculations of a typical prismatic VHTR are conducted to better understand bypass flow phenomena and establish an evaluation method for the reactor core using the commercial CFD code FLUENT. Parametric calculations changing several factors in a one-twelfth sector of a fuel column are performed. The simulations show the impact of each factor on bypass flow and the resulting flow and temperature distributions in the prismatic core. Factors include inter-column gap-width, turbulence model, axial heat generation profile and geometry change from irradiation-induced shrinkage in the graphite block region. It is shown that bypass flow provides a significant cooling effect on the prismatic block and that the maximum fuel and coolant channel outlet temperatures increase with an increase in gap-width, especially when a peak radial factor is applied to the total heat generation rate. Also, the presence of bypass flow causes a large lateral temperature gradient in the block and also dramatically increases the variation in coolant channel outlet temperatures for a given block that may have repercussions on the structural integrity of the graphite, the neutronics and the potential for hot streaking and hot spots occurring in the lower plenum. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Sato, Hiroyuki] Japan Atom Energy Agcy, Oarai, Ibaraki, Japan.
[Sato, Hiroyuki; Johnson, Richard; Schultz, Richard] Idaho Natl Lab, Idaho Falls, ID 83415 USA.
RP Sato, H (reprint author), Japan Atom Energy Agcy, Oarai, Ibaraki, Japan.
EM sato.hiroyuki09@jaea.go.jp
FU US Department of Energy [DE-AC07-05ID14517]
FX This manuscript has been authored by Battelle Energy Alliance, LLC under
Contract No. DE-AC07-05ID14517 with the US Department of Energy. The
United States Government retains and the publisher, by accepting the
article for publication, acknowledges that the United States Government
retains a nonexclusive, paid-up, irrevocable, world-wide license to
publish or reproduce the published form of this manuscript, or allow
others to do so, for United States Government purposes. The authors also
wish to thank to Prof. Yoichi Fujii-e, former chairman of Atomic Energy
Commission of Japan, for assistance under the Fujii-e Research
Initiative by the US Department of Energy.
NR 23
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U1 0
U2 3
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0306-4549
J9 ANN NUCL ENERGY
JI Ann. Nucl. Energy
PD SEP
PY 2010
VL 37
IS 9
BP 1172
EP 1185
DI 10.1016/j.anucene.2010.04.021
PG 14
WC Nuclear Science & Technology
SC Nuclear Science & Technology
GA 627II
UT WOS:000280032300005
ER
PT J
AU Gubankova, E
Mannarelli, M
Sharma, R
AF Gubankova, Elena
Mannarelli, Massimo
Sharma, Rishi
TI Collective modes in asymmetric ultracold Fermi systems
SO ANNALS OF PHYSICS
LA English
DT Article
DE Fermi gases; Vortices; BCS-BEC crossover
ID FESHBACH RESONANCES; PHASE-SEPARATION; EXCHANGE FIELD;
SUPERCONDUCTIVITY; CROSSOVER; BCS; STATE; QCD; CONDENSATION; TEMPERATURE
AB We derive the long wavelength effective action for the collective modes in systems of fermions interacting via a short-range s-wave attraction featuring unequal chemical potentials for the two fermionic species (asymmetric systems) As a consequence of the attractive interaction fermions form a condensate that spontaneously breaks the U(1) symmetry associated with total number conservation Therefore at sufficiently small temperatures and asymmetries the system is a superfluid We reproduce previous results for the stability conditions of the system as a function of the four-fermion coupling and asymmetry we obtain these results analyzing the coefficients of the low energy effective Lagrangian of the modes describing fluctuations in the magnitude (Higgs mode) and in the phase (Nambu-Goldstone or Anderson-Bogoliubov mode) of the difermion condensate We find that for certain values of parameters the mass of the Higgs mode decreases with increasing mismatch between the chemical potentials of the two populations if we keep the scattering length and the gap parameter constant Furthermore we find that the energy cost for creating a position dependent fluctuation of the condensate is constant in the gapped region and increases in the gapless region These two features may lead to experimentally detectable effects As an example we argue that if the superfluid is put in rotation the square of the radius of the outer core of a vortex should sharply increase on increasing the asymmetry when we pass through the relevant region in the gapless superfluid phase Finally by gauging the global U(1) symmetry we relate the coefficients of the effective Lagrangian of the Nambu-Goldstone mode with the screening masses of the gauge field Published by Elsevier Inc
C1 [Sharma, Rishi] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Mannarelli, Massimo] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA.
[Gubankova, Elena] Inst Theoret & Expt Phys, Moscow 117218, Russia.
[Mannarelli, Massimo] Univ Barcelona, Dept Estruct & Constituents Mat, E-08028 Barcelona, Spain.
[Mannarelli, Massimo] Univ Barcelona, Inst Ciencies Cosmos ICCUB, E-08028 Barcelona, Spain.
RP Sharma, R (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
FU Ministerio de Educacion y Ciencia (MEC); CPAN [FPA2007-66665,
2009SGR502]; DOE [DE-AC52-06NA25396]
FX The authors thank Andreas Schmitt and Sanjay Reddy for their valuable
comments on the manuscript EG and RS thank Michael Forbes Dam Son Misha
Stephanov Eugene Dennler Bertrand Halperin Martin Zwierlein Leonid
Levitov and Carlos Sa de Melo for discussions RS acknowledges several
discussions with Sanjay Reddy The work of MM has been supported by the
Ministerio de Educacion y Ciencia (MEC) and CPAN under grants
FPA2007-66665 and 2009SGR502 RS is supported by LANS LLC for the NNSA of
the DOE under contract #DE-AC52-06NA25396
NR 92
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U1 2
U2 4
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 0003-4916
J9 ANN PHYS-NEW YORK
JI Ann. Phys.
PD SEP
PY 2010
VL 325
IS 9
BP 1987
EP 2017
DI 10.1016/j.aop.2010.05.001
PG 31
WC Physics, Multidisciplinary
SC Physics
GA 694BE
UT WOS:000285269200006
ER
PT J
AU Vishnivetskaya, TA
Brandt, CC
Madden, AS
Drake, MM
Kostka, JE
Akob, DM
Kusel, K
Palumbo, AV
AF Vishnivetskaya, Tatiana A.
Brandt, Craig C.
Madden, Andrew S.
Drake, Meghan M.
Kostka, Joel E.
Akob, Denise M.
Kuesel, Kirsten
Palumbo, Anthony V.
TI Microbial Community Changes in Response to Ethanol or Methanol
Amendments for U(VI) Reduction
SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY
LA English
DT Article
ID URANIUM-CONTAMINATED AQUIFER; SP-NOV; SUBSURFACE SEDIMENTS; HUMIC
SUBSTANCES; GEN. NOV.; ANAEROMYXOBACTER-DEHALOGENANS;
TRICHLOROBACTER-THIOGENES; ANAEROBIC RESPIRATION; ACETOGENIC BACTERIUM;
SUBMICROMOLAR LEVELS
AB Microbial community responses to ethanol, methanol, and methanol plus humics amendments in relationship to U(VI) bioreduction were studied in laboratory microcosm experiments using sediments and ground water from a uranium-contaminated site in Oak Ridge, TN. The type of carbon source added, the duration of incubation, and the sampling site influenced the bacterial community structure upon incubation. Analysis of 16S rRNA gene clone libraries indicated that (i) bacterial communities found in ethanol-and methanol-amended samples with U(VI) reduction were similar due to the presence of Deltaproteobacteria and Betaproteobacteria (members of the families Burkholderiaceae, Comamonadaceae, Oxalobacteraceae, and Rhodocyclaceae); (ii) methanol-amended samples without U(VI) reduction exhibited the lowest diversity and the bacterial community contained 69.2 to 92.8% of the family Methylophilaceae; and (iii) the addition of humics resulted in an increase of phylogenetic diversity of Betaproteobacteria (Rodoferax, Polaromonas, Janthinobacterium, Methylophilales, and unclassified) and Firmicutes (Desulfosporosinus and Clostridium).
C1 [Palumbo, Anthony V.] Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN 37831 USA.
[Madden, Andrew S.] Univ Oklahoma, Sch Geol & Geophys, Coll Earth & Energy, Norman, OK 73019 USA.
[Kostka, Joel E.; Akob, Denise M.] Florida State Univ, Tallahassee, FL 32306 USA.
[Akob, Denise M.; Kuesel, Kirsten] Univ Jena, Inst Ecol, D-07743 Jena, Germany.
RP Palumbo, AV (reprint author), Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN 37831 USA.
EM palumboav@ornl.gov
RI Palumbo, Anthony/A-4764-2011; Drake, Meghan/A-6446-2011; Akob,
Denise/D-9478-2013;
OI Palumbo, Anthony/0000-0002-1102-3975; Drake, Meghan/0000-0001-7969-4823;
Vishnivetskaya, Tatiana/0000-0002-0660-023X; Akob,
Denise/0000-0003-1534-3025
FU U.S. Department of Energy's Office of Science Biological and
Environmental Research; U.S. Department of Energy [DE-AC05-00OR22725]
FX This work was funded by the U.S. Department of Energy's Office of
Science Biological and Environmental Research, Environmental Remediation
Sciences Program. Oak Ridge National Laboratory is managed by
UT-Battelle, LLC, for the U. S. Department of Energy under contract
DE-AC05-00OR22725.
NR 72
TC 12
Z9 12
U1 0
U2 16
PU AMER SOC MICROBIOLOGY
PI WASHINGTON
PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA
SN 0099-2240
J9 APPL ENVIRON MICROB
JI Appl. Environ. Microbiol.
PD SEP
PY 2010
VL 76
IS 17
BP 5728
EP 5735
DI 10.1128/AEM.00308-10
PG 8
WC Biotechnology & Applied Microbiology; Microbiology
SC Biotechnology & Applied Microbiology; Microbiology
GA 643IE
UT WOS:000281288000009
PM 20601514
ER
PT J
AU Samuel, R
Pu, YQ
Raman, B
Ragauskas, AJ
AF Samuel, Reichel
Pu, Yunqiao
Raman, Babu
Ragauskas, Arthur J.
TI Structural Characterization and Comparison of Switchgrass Ball-milled
Lignin Before and After Dilute Acid Pretreatment
SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
LA English
DT Article
DE Pretreatment; Switchgrass; Ball-milled lignin; HSQC; (13)C and (31)P NMR
spectroscopy
ID NUCLEAR-MAGNETIC-RESONANCE; ENZYMATIC SACCHARIFICATION; LIGNOCELLULOSIC
MATERIALS; WOOD LIGNINS; WHEAT-STRAW; RICE HULLS; ETHANOL; ENERGY;
DELIGNIFICATION; FERMENTATION
AB To reduce the recalcitrance and enhance enzymatic activity, dilute H(2)SO(4) pretreatment was carried out on Alamo switchgrass (Panicum virgatum). Ball-milled lignin was isolated from switchgrass before and after pretreatment. Its structure was characterized by (13)C, HSQC, and (31)P NMR spectroscopy. It was confirmed that ball-milled switchgrass lignin is of HGS type with a considerable amount of p-coumarate and felurate esters of lignin. The major ball-milled lignin interunit was the beta-O-4 linkage, and a minor amount of phenylcoumarin, resinol, and spirodienone units were also present. As a result of the acid pretreatment, there was 36% decrease of beta-O-4 linkage observed. In addition to these changes, the S/G ratio decreases from 0.80 to 0.53.
C1 [Samuel, Reichel; Pu, Yunqiao; Raman, Babu; Ragauskas, Arthur J.] Oak Ridge Natl Lab, BioEnergy Sci Ctr, Oak Ridge, TN 37831 USA.
[Samuel, Reichel; Ragauskas, Arthur J.] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA.
[Pu, Yunqiao; Ragauskas, Arthur J.] Georgia Inst Technol, Inst Paper Sci & Technol, Atlanta, GA 30332 USA.
[Raman, Babu] Oak Ridge Natl Lab, Biosci Div, Oak Ridge, TN USA.
RP Ragauskas, AJ (reprint author), Oak Ridge Natl Lab, BioEnergy Sci Ctr, Oak Ridge, TN 37831 USA.
EM arthur.ragauskas@ipst.gatech.edu
OI Pu, Yunqiao/0000-0003-2554-1447; Ragauskas, Arthur/0000-0002-3536-554X
FU DOE Office of Biological and Environmental Research [DE-AC05-00OR22725]
FX The BioEnergy Science Center (BESC) is a U. S. Department of Energy
Bioenergy Research Center supported by the Office of Biological and
Environmental Research in the DOE Office of Science. The authors would
like to gratefully acknowledge the financial support from DOE Office of
Biological and Environmental Research through the BioEnergy Science
Center (DE-AC05-00OR22725). The authors also would like to thank the
valuable discussions of Dr. Sannigrahi and Bassem B. Hallac for this
manuscript.
NR 54
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U1 2
U2 55
PU HUMANA PRESS INC
PI TOTOWA
PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA
SN 0273-2289
J9 APPL BIOCHEM BIOTECH
JI Appl. Biochem. Biotechnol.
PD SEP
PY 2010
VL 162
IS 1
BP 62
EP 74
DI 10.1007/s12010-009-8749-y
PG 13
WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology
SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology
GA 577VR
UT WOS:000276252600007
PM 19701727
ER
PT J
AU Huesemann, MH
Hausmann, TS
Carter, BM
Gerschler, JJ
Benemann, JR
AF Huesemann, Michael H.
Hausmann, Tom S.
Carter, Blaine M.
Gerschler, Jared J.
Benemann, John R.
TI Hydrogen Generation Through Indirect Biophotolysis in Batch Cultures of
the Nonheterocystous Nitrogen-Fixing Cyanobacterium Plectonema boryanum
SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
LA English
DT Article
DE Indirect biophotolysis; Cyanobacteria; Glycogen; DCMU
ID CHLAMYDOMONAS-REINHARDTII; GREEN-ALGA; EVOLUTION; PHOTOPRODUCTION;
OPTIMIZATION; MICROALGAE; GROWTH; H-2
AB The nitrogen-fixing nonheterocystous cyanobacterium Plectonema boryanum was used as a model organism to study hydrogen generation by indirect biophotolysis in nitrogen-limited batch cultures that were continuously illuminated and sparged with argon/CO(2) to maintain anaerobiosis. The highest hydrogen-production rate (i.e., 0.18 mL/mg day or 7.3 A mu mol/mg day) was observed in cultures with an initial medium nitrate concentration of 1 mM at a light intensity of 100 A mu mol/m(2) s. The addition of photosystem II (PSII) inhibitor 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) did not reduce hydrogen-production rates relative to unchallenged controls for 50 to 150 h, and intracellular glycogen concentrations decreased significantly during the hydrogen generation period. The insensitivity of the hydrogen-production process to DCMU is indicative of the fact that hydrogen was not derived from water splitting at PSII (i.e., direct biophotolysis) but rather from electrons provided by intracellular glycogen reserves (i.e., indirect biophotolysis). It was shown that hydrogen generation could be sustained for long time periods by subjecting the cultures to alternating cycles of aerobic, nitrogen-limited growth and anaerobic hydrogen production.
C1 [Huesemann, Michael H.; Hausmann, Tom S.; Carter, Blaine M.; Gerschler, Jared J.] Pacific NW Natl Lab, Marine Sci Lab, Sequim, WA 98382 USA.
[Benemann, John R.] Benemann Associates, Walnut Creek, CA 94595 USA.
RP Huesemann, MH (reprint author), Pacific NW Natl Lab, Marine Sci Lab, 1529 W Sequim Bay Rd, Sequim, WA 98382 USA.
EM michael.huesemann@pnl.gov
RI James, Gabriel/F-7739-2011
FU Department of Energy National Energy Technology Laboratory; Department
of Energy Office of Science
FX Funding for this project was provided by the Department of Energy
National Energy Technology Laboratory and two SULI stipends from the
Department of Energy Office of Science to Blaine Carter and Jared
Gerschler, respectively.
NR 31
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Z9 12
U1 2
U2 20
PU HUMANA PRESS INC
PI TOTOWA
PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 USA
SN 0273-2289
J9 APPL BIOCHEM BIOTECH
JI Appl. Biochem. Biotechnol.
PD SEP
PY 2010
VL 162
IS 1
BP 208
EP 220
DI 10.1007/s12010-009-8741-6
PG 13
WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology
SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology
GA 577VR
UT WOS:000276252600019
PM 19697159
ER
PT J
AU Wang, EQ
Li, SZ
Tao, L
Geng, X
Li, TC
AF Wang, Er-Qiang
Li, Shi-Zhong
Tao, Ling
Geng, Xin
Li, Tian-Cheng
TI Modeling of rotating drum bioreactor for anaerobic solid-state
fermentation
SO APPLIED ENERGY
LA English
DT Article
DE Mathematical model; Anaerobic; Solid-state fermentation; Rotating drum
bioreactor; Ethanol; Sweet sorghum stalk; Biofuel
ID SUBSTRATE FERMENTATION; ENGINEERING ASPECTS; HEAT-TRANSFER; SYSTEMS
AB Solid-state fermentation (SSF) has received more attention and has been applied to production of different products in recent years, especially biofuel production. The major problems to overcome in large-scale SSF are heat accumulation and heterogeneous distribution in a complex gas-liquid-solid multiphase bioreactor (or fermenter) system. In this work, a mathematical model of a rotating drum bioreactor for anaerobic SSF is developed considering the radial temperature distribution in the substrate bed. Validation experiments were conducted in a 5 m(3) pilot plant fermenter for production of fuel ethanol from milled sweet sorghum stalks. The model that was developed fit well with the experimental data. From these results, it was concluded that this mathematical model is a powerful tool to investigate the design and scale-up of an anaerobic SSF fermenter in the application of bioethanol production using cellulosic materials such as sweet sorghum stalks. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Wang, Er-Qiang; Li, Shi-Zhong; Li, Tian-Cheng] Tsinghua Univ, Inst Nucl & New Energy Technol, Beijing 100084, Peoples R China.
[Tao, Ling] Natl Renewable Energy Lab, Golden, CO 80401 USA.
[Geng, Xin] China Agr Univ, Resource & Environm Engn Coll, Beijing 100094, Peoples R China.
RP Li, SZ (reprint author), Tsinghua Univ, Inst Nucl & New Energy Technol, 1 Tsinghua Garden Rd, Beijing 100084, Peoples R China.
EM szli@tsinghua.edu.cn
NR 24
TC 18
Z9 21
U1 6
U2 24
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0306-2619
J9 APPL ENERG
JI Appl. Energy
PD SEP
PY 2010
VL 87
IS 9
SI SI
BP 2839
EP 2845
DI 10.1016/j.apenergy.2009.05.032
PG 7
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 623BA
UT WOS:000279710500011
ER
PT J
AU Hollister, EB
Forrest, AK
Wilkinson, HH
Ebbole, DJ
Malfatti, SA
Tringe, SG
Holtzapple, MT
Gentry, TJ
AF Hollister, Emily B.
Forrest, Andrea K.
Wilkinson, Heather H.
Ebbole, Daniel J.
Malfatti, Stephanie A.
Tringe, Susannah G.
Holtzapple, Mark T.
Gentry, Terry J.
TI Structure and dynamics of the microbial communities underlying the
carboxylate platform for biofuel production
SO APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
LA English
DT Article
DE Mixed alcohol bioreactor; Lignocellulosic biofuels; Tag-pyrosequencing;
Microbial communities; Carboxylate platform
ID RIBOSOMAL-RNA ANALYSIS; MIXED-CULTURE; MESOPHILIC MICROORGANISMS;
AZOTOBACTER-CHROOCOCCUM; CELLULOSE DEGRADATION; HYDROGEN-PRODUCTION;
CLOSTRIDIUM; FERMENTATION; CONVERSION; BACTERIA
AB The carboxylate platform utilizes a mixed microbial community to convert lignocellulosic biomass into chemicals and fuels. While much of the platform is well understood, little is known about its microbiology. Mesophilic (40 degrees C) and thermophilic (55 degrees C) fermentations employing a sorghum feedstock and marine sediment inoculum were profiled using 16S rRNA tag-pyrosequencing over the course of a 30-day incubation. The contrasting fermentation temperatures converted similar amounts of biomass, but the mesophilic community was significantly more productive, and the two temperatures differed significantly with respect to propionic and butyric acid production. Pyrotag sequencing revealed the presence of dynamic communities that responded rapidly to temperature and changed substantially over time. Both temperatures were dominated by bacteria resembling Clostridia, but they shared few taxa in common. The species-rich mesophilic community harbored a variety of Bacteroidetes, Actinobacteria, and gamma-Proteobacteria, whereas the thermophilic community was composed mainly of Clostridia and Bacilli. Despite differences in composition and productivity, similar patterns of functional class dynamics were observed. Over time, organisms resembling known cellulose degraders decreased in abundance, while organisms resembling known xylose degraders increased. Improved understanding of the carboxylate platform's microbiology will help refine platform performance and contribute to our growing knowledge regarding biomass conversion and biofuel production processes.
C1 [Hollister, Emily B.; Gentry, Terry J.] Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA.
[Forrest, Andrea K.; Holtzapple, Mark T.] Texas A&M Univ, Dept Chem Engn, College Stn, TX 77843 USA.
[Wilkinson, Heather H.; Ebbole, Daniel J.] Texas A&M Univ, Dept Plant Pathol & Microbiol, College Stn, TX 77843 USA.
[Malfatti, Stephanie A.; Tringe, Susannah G.] US DOE, Joint Genome Inst, Walnut Creek, CA 94598 USA.
RP Hollister, EB (reprint author), Texas A&M Univ, Dept Soil & Crop Sci, 370 Olsen Blvd,TAMU 2474, College Stn, TX 77843 USA.
EM ehollister@tamu.edu
OI Tringe, Susannah/0000-0001-6479-8427
FU Department of Energy's Joint Genome Institute; Texas AgriLife Research
Bioenergy Program; Texas AM University; Lawrence Berkeley National
Laboratory [DE-AC02-05CH11231]; Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]; Los Alamos National Laboratory [DE-AC02-06NA25396]
FX This work was supported by grants from the Department of Energy's Joint
Genome Institute, the Texas AgriLife Research Bioenergy Program, and the
Texas A&M University Office of the Vice President for Research Energy
Resources Program. This work 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 Berkeley
National Laboratory under contract No. DE-AC02-05CH11231, Lawrence
Livermore National Laboratory under Contract No. DE-AC52-07NA27344, and
Los Alamos National Laboratory under contract No. DE-AC02-06NA25396. The
authors would like to acknowledge Mukul Sherekar and Heidi Mjelde for
their assistance in the lab; Kanwar Singh for library construction and
sequencing; the Sorghum Breeding and Genetics Program at Texas A&M
University for providing the sorghum that was used as the bioreactor
feedstock for this study; and two anonymous reviewers whose comments
helped to improve this manuscript.
NR 43
TC 17
Z9 17
U1 6
U2 34
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0175-7598
J9 APPL MICROBIOL BIOT
JI Appl. Microbiol. Biotechnol.
PD SEP
PY 2010
VL 88
IS 1
BP 389
EP 399
DI 10.1007/s00253-010-2789-7
PG 11
WC Biotechnology & Applied Microbiology
SC Biotechnology & Applied Microbiology
GA 638RZ
UT WOS:000280914900039
PM 20676626
ER
PT J
AU Young, ML
Casadio, F
Schnepp, S
Pearlstein, E
Almer, JD
Haeffner, DR
AF Young, M. L.
Casadio, F.
Schnepp, S.
Pearlstein, E.
Almer, J. D.
Haeffner, D. R.
TI Non-invasive characterization of manufacturing techniques and corrosion
of ancient Chinese bronzes and a later replica using synchrotron X-ray
diffraction
SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
LA English
DT Article
ID RADIATION; FLUORESCENCE; METALLURGY; ALLOYS; LIGHT
AB Three bronze vessels from the ancient Chinese art collection at the Art Institute of Chicago (AIC) were examined-with the advanced non-invasive characterization capabilities of high-energy synchrotron X-ray diffraction performed at the Advanced Photon Source (APS) of Argonne National Laboratory (ANL)-to create a comprehensive overview of each object's manufacture as well as subsequent corrosion processes. Findings were also complemented with traditional non-invasive characterization techniques, including optical imaging, X-ray radiographic imaging, and X-ray fluorescence (XRF) spectrometry. The results-obtained without sampling-allow a clear distinction between genuinely ancient Chinese bronzes from those with modern restorations and from "archaistic" objects made many centuries later, in emulation of ancient styles.
C1 [Casadio, F.; Schnepp, S.; Pearlstein, E.] Art Inst Chicago, Chicago, IL 60603 USA.
[Young, M. L.] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA.
[Almer, J. D.; Haeffner, D. R.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RP Casadio, F (reprint author), Art Inst Chicago, Chicago, IL 60603 USA.
EM fcasadio@artic.edu
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-CH11357]; Andrew W. Mellon Foundation
FX The authors thank the supporting staffs at both the Art Institute of
Chicago and the Advanced Photon Source. The authors would like to
especially thank Hajo Gugel for help on the SEM, and Dr. Pieter Meyers
for preliminary examination of the wine vessel and for providing the
cross-sectional sample for further study. Use of the Advanced Photon
Source at ANL was supported by the U.S. Department of Energy, Office of
Science, Office of Basic Energy Sciences, under Contract No.
DE-AC02-CH11357. This research also benefited from the financial support
from the Andrew W. Mellon Foundation (A.Z. Rudenstine, program officer).
NR 22
TC 6
Z9 6
U1 2
U2 7
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0947-8396
J9 APPL PHYS A-MATER
JI Appl. Phys. A-Mater. Sci. Process.
PD SEP
PY 2010
VL 100
IS 3
BP 635
EP 646
DI 10.1007/s00339-010-5646-8
PG 12
WC Materials Science, Multidisciplinary; Physics, Applied
SC Materials Science; Physics
GA 643SA
UT WOS:000281317700008
ER
PT J
AU Goulay, F
Schrader, PE
Michelsen, HA
AF Goulay, F.
Schrader, P. E.
Michelsen, H. A.
TI Effect of the wavelength dependence of the emissivity on inferred soot
temperatures measured by spectrally resolved laser-induced incandescence
SO APPLIED PHYSICS B-LASERS AND OPTICS
LA English
DT Article
ID TURBULENT-DIFFUSION FLAMES; PRIMARY PARTICLE-SIZE; OPTICAL-PROPERTIES;
REFRACTIVE-INDEXES; GENERATED SOOT; LII; ABSORPTION; SCATTERING;
DISTRIBUTIONS; EXTINCTION
AB Flame-generated soot was heated using a pulsed laser, and temperatures of the irradiated soot were inferred by fitting the Planck function to spectrally resolved laser-induced incandescence with the temperature as an adjustable parameter. The effect of the wavelength dependence of the emissivity on the inferred temperatures of the irradiated soot was studied using selected expressions for the soot emissivity in the fit. Depending upon the choice of the functional form of the emissivity, the maximum temperature reached by the soot during the laser pulse was calculated to span a range of 341 K (3475-3816 K) at a 1064-nm laser fluence of 0.1 J/cm(2) and 456 K (4115-4571 K) at a 1064-nm laser fluence of 0.4 J/cm(2) with a 1 sigma standard deviation about the mean of similar to 25 K. Comparison of the present results with temperature measurements from previous studies suggests that the emissivity may depend on flame conditions and that further investigation on the subject is needed. The use of two-color or spectrally resolved LII to infer the soot temperature during or after laser heating requires a careful characterization of the wavelength dependence of the emissivity. The spread in temperature leads to large uncertainties regarding the physico-chemical processes occurring at the surface of the soot during the laser heating.
C1 [Goulay, F.; Schrader, P. E.; Michelsen, H. A.] Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA.
RP Michelsen, HA (reprint author), Sandia Natl Labs, Combust Res Facil, POB 969,MS 9055, Livermore, CA 94551 USA.
EM hamiche@sandia.gov
FU Division of Chemical Sciences, Geosciences, and Biosciences, the Office
of Basic Energy Sciences, the US Department of Energy; National Nuclear
Security Administration [DE-AC4-94-AL85000]
FX This work was supported by the Division of Chemical Sciences,
Geosciences, and Biosciences, the Office of Basic Energy Sciences, the
US Department of Energy. Sandia is a multiprogram laboratory operated by
Sandia Corporation, a Lockheed Martin Company, for the National Nuclear
Security Administration under contract DE-AC4-94-AL85000.
NR 60
TC 13
Z9 13
U1 2
U2 14
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0946-2171
J9 APPL PHYS B-LASERS O
JI Appl. Phys. B-Lasers Opt.
PD SEP
PY 2010
VL 100
IS 3
BP 655
EP 663
DI 10.1007/s00340-010-4119-2
PG 9
WC Optics; Physics, Applied
SC Optics; Physics
GA 637TU
UT WOS:000280842400029
ER
PT J
AU Rao, DV
Swapna, M
Cesareo, R
Brunetti, A
Zhong, Z
Akatsuka, T
Yuasa, T
Takeda, T
Gigante, GE
AF Rao, Donepudi V.
Swapna, Medasani
Cesareo, Roberto
Brunetti, Antonio
Zhong, Zhong
Akatsuka, Takao
Yuasa, Tetsuya
Takeda, Tohoru
Gigante, Giovanni E.
TI Use of synchrotron-based diffraction-enhanced imaging for visualization
of soft tissues in invertebrates
SO APPLIED RADIATION AND ISOTOPES
LA English
DT Article
DE Diffraction-enhanced imaging; Synchrotron; Invertebrates; Soft tissue
ID RADIOGRAPHY; IMPLEMENTATION; REFRACTION; CARTILAGE; CONTRAST; IMAGES;
MODEL
AB Images of terrestrial and marine invertebrates (snails and bivalves) have been obtained by using an X-ray phase-contrast imaging technique, namely, synchrotron-based diffraction-enhanced imaging. Synchrotron X-rays of 20, 30 and 40 key were used, which penetrate deep enough into animal soft tissues. The phase of X-ray photons shifts slightly as they traverse an object, such as animal soft tissue, and interact with its atoms. Biological features, such as shell morphology and animal physiology, have been visualized. The contrast of the images obtained at 40 key is the best. This optimum energy provided a clear view of the internal structural organization of the soft tissue with better contrast. The contrast is higher at edges of internal soft-tissue structures. The image improvements achieved with the diffraction-enhanced imaging technique are due to extinction, i.e., elimination of ultra-small-angle scattering. They enabled us to identify a few embedded internal shell features, such as the origin of the apex, which is the firmly attached region of the soft tissue connecting the umbilicus to the external morphology. Diffraction-enhanced imaging can provide high-quality images of soft tissues valuable for biology. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Rao, Donepudi V.; Swapna, Medasani; Cesareo, Roberto; Brunetti, Antonio] Univ Sassari, Ist Matemat & Fis, I-07100 Sassari, Italy.
[Zhong, Zhong] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA.
[Akatsuka, Takao; Yuasa, Tetsuya] Yamagata Univ, Fac Engn, Dept Biosyst Engn, Yonezawa, Yamagata 9928510, Japan.
[Takeda, Tohoru] Kitasato Univ, Kanagawa 2288555, Japan.
[Gigante, Giovanni E.] Univ Rome, Dipartimento Fis, I-00185 Rome, Italy.
RP Rao, DV (reprint author), Sir CRR Autonomous Coll, Dept Phys, Eluru 534007, Andhra Pradesh, India.
EM donepudi_venkateswararao@rediffmail.com; medasanisw@gmail.com
RI Yuasa, Tetsuya/F-5006-2013; brunetti, antonio/F-3370-2011
OI Gigante, Giovanni Ettore/0000-0001-5943-9366; brunetti,
antonio/0000-0002-0116-1899
FU DST, India
FX One of the authors (DVR) utilized the available facilities at ICTP
(Trieste, Italy), Istituto di Matematica e Fisica, Universita di
Sassari. Italy, and Department of Bio-System Engineering of Yamagata
University (Yonezawa, Japan). Travel support (DVR) at the time of
experiments was supported by DST, India, under the category of
utilization of synchrotron and neutron scattering facilities.
NR 29
TC 7
Z9 7
U1 0
U2 1
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0969-8043
J9 APPL RADIAT ISOTOPES
JI Appl. Radiat. Isot.
PD SEP
PY 2010
VL 68
IS 9
BP 1687
EP 1693
DI 10.1016/j.apradiso.2010.04.001
PG 7
WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology,
Nuclear Medicine & Medical Imaging
SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine &
Medical Imaging
GA 619FY
UT WOS:000279415800015
PM 20434918
ER
PT J
AU Saey, PRJ
Bowyer, TW
Ringbom, A
AF Saey, Paul R. J.
Bowyer, Theodore W.
Ringbom, Anders
TI Isotopic noble gas signatures released from medical isotope production
facilities-Simulations and measurements
SO APPLIED RADIATION AND ISOTOPES
LA English
DT Article
DE Uranium target irradiation; Medical isotopes; Low level radioxenon
measurement; Environmental monitoring; Treaty verification; CTBTO
AB Radioxenon isotopes play a major role in confirming whether or not an underground explosion was nuclear in nature. It is then of key importance to understand the sources of environmental radioxenon to be able to distinguish civil sources from those of a nuclear explosion. Based on several years of measurements, combined with advanced atmospheric transport model results, it was recently shown that the main source of radioxenon observations are strong and regular batch releases from a very limited number of medical isotope production facilities.
This paper reviews production processes in different medical isotope facilities during which radioxenon is produced. Radioxenon activity concentrations and isotopic compositions are calculated for six large facilities. The results are compared with calculated signals from nuclear explosions. Further, the outcome is compared and found to be consistent with radioxenon measurements recently performed in and around three of these facilities. Some anomalies in measurements in which (131m)Xe was detected were found and a possible explanation is proposed. It was also calculated that the dose rate of the releases is well below regulatory values.
Based on these results, it should be possible to better understand, interpret and verify signals measured in the noble gas measurement systems in the International Monitoring of the Comprehensive Nuclear-Test-Ban Treaty. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Saey, Paul R. J.] Vienna Univ Technol, Inst Atom, Austrian Univ, A-1020 Vienna, Austria.
[Bowyer, Theodore W.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Ringbom, Anders] Swedish Def Res Agcy FOI, Def & Secur Syst & Technol Div, S-17290 Stockholm, Sweden.
RP Saey, PRJ (reprint author), Vienna Univ Technol, Inst Atom, Austrian Univ, Stadionallee 2, A-1020 Vienna, Austria.
EM paul.saey@ati.ac.at
NR 26
TC 28
Z9 28
U1 0
U2 8
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0969-8043
J9 APPL RADIAT ISOTOPES
JI Appl. Radiat. Isot.
PD SEP
PY 2010
VL 68
IS 9
BP 1846
EP 1854
DI 10.1016/j.apradiso.2010.04.014
PG 9
WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology,
Nuclear Medicine & Medical Imaging
SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine &
Medical Imaging
GA 619FY
UT WOS:000279415800039
PM 20447828
ER
PT J
AU King, DJ
Brodrick, J
AF King, Darrell J.
Brodrick, James
TI Residential DC Power Bus
SO ASHRAE JOURNAL
LA English
DT Article
C1 [King, Darrell J.] TIAX LLC, Lexington, MA USA.
[Brodrick, James] US DOE, Bldg Technol Program, Washington, DC USA.
RP King, DJ (reprint author), TIAX LLC, Lexington, MA USA.
NR 1
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC HEATING REFRIGERATING AIR-CONDITIONING ENG, INC,
PI ATLANTA
PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 USA
SN 0001-2491
J9 ASHRAE J
JI ASHRAE J.
PD SEP
PY 2010
VL 52
IS 9
BP 73
EP +
PG 3
WC Thermodynamics; Construction & Building Technology; Engineering,
Mechanical
SC Thermodynamics; Construction & Building Technology; Engineering
GA 651LL
UT WOS:000281929100021
ER
PT J
AU Bersanelli, M
Mandolesi, N
Butler, RC
Mennella, A
Villa, F
Aja, B
Artal, E
Artina, E
Baccigalupi, C
Balasini, M
Baldan, G
Banday, A
Bastia, P
Battaglia, P
Bernardino, T
Blackhurst, E
Boschini, L
Burigana, C
Cafagna, G
Cappellini, B
Cavaliere, F
Colombo, F
Crone, G
Cuttaia, F
D'Arcangelo, O
Danese, L
Davies, RD
Davis, RJ
De Angelis, L
De Gasperis, GC
De La Fuente, L
De Rosa, A
De Zotti, G
Falvella, MC
Ferrari, F
Ferretti, R
Figini, L
Fogliani, S
Franceschet, C
Franceschi, E
Gaier, T
Garavaglia, S
Gomez, F
Gorski, K
Gregorio, A
Guzzi, P
Herreros, JM
Hildebrandt, SR
Hoyland, R
Hughes, N
Janssen, M
Jukkala, P
Kettle, D
Kilpia, VH
Laaninen, M
Lapolla, PM
Lawrence, CR
Lawson, D
Leahy, JP
Leonardi, R
Leutenegger, P
Levin, S
Lilje, PB
Lowe, SR
Lubin, PM
Maino, D
Malaspina, M
Maris, M
Marti-Canales, J
Martinez-Gonzalez, E
Mediavilla, A
Meinhold, P
Miccolis, M
Morgante, G
Natoli, P
Nesti, R
Pagan, L
Paine, C
Partridge, B
Pascual, JP
Pasian, F
Pearson, D
Pecora, M
Perrotta, F
Platania, P
Pospieszalski, M
Poutanen, T
Prina, M
Rebolo, R
Roddis, N
Rubino-Martin, JA
Salmon, MJ
Sandri, M
Seiffert, M
Silvestri, R
Simonetto, A
Sjoman, P
Smoot, GF
Sozzi, C
Stringhetti, L
Taddei, E
Tauber, J
Terenzi, L
Tomasi, M
Tuovinen, J
Valenziano, L
Varis, J
Vittorio, N
Wade, LA
Wilkinson, A
Winder, F
Zacchei, A
Zonca, A
AF Bersanelli, M.
Mandolesi, N.
Butler, R. C.
Mennella, A.
Villa, F.
Aja, B.
Artal, E.
Artina, E.
Baccigalupi, C.
Balasini, M.
Baldan, G.
Banday, A.
Bastia, P.
Battaglia, P.
Bernardino, T.
Blackhurst, E.
Boschini, L.
Burigana, C.
Cafagna, G.
Cappellini, B.
Cavaliere, F.
Colombo, F.
Crone, G.
Cuttaia, F.
D'Arcangelo, O.
Danese, L.
Davies, R. D.
Davis, R. J.
De Angelis, L.
De Gasperis, G. C.
De La Fuente, L.
De Rosa, A.
De Zotti, G.
Falvella, M. C.
Ferrari, F.
Ferretti, R.
Figini, L.
Fogliani, S.
Franceschet, C.
Franceschi, E.
Gaier, T.
Garavaglia, S.
Gomez, F.
Gorski, K.
Gregorio, A.
Guzzi, P.
Herreros, J. M.
Hildebrandt, S. R.
Hoyland, R.
Hughes, N.
Janssen, M.
Jukkala, P.
Kettle, D.
Kilpia, V. H.
Laaninen, M.
Lapolla, P. M.
Lawrence, C. R.
Lawson, D.
Leahy, J. P.
Leonardi, R.
Leutenegger, P.
Levin, S.
Lilje, P. B.
Lowe, S. R.
Lubin, P. M.
Maino, D.
Malaspina, M.
Maris, M.
Marti-Canales, J.
Martinez-Gonzalez, E.
Mediavilla, A.
Meinhold, P.
Miccolis, M.
Morgante, G.
Natoli, P.
Nesti, R.
Pagan, L.
Paine, C.
Partridge, B.
Pascual, J. P.
Pasian, F.
Pearson, D.
Pecora, M.
Perrotta, F.
Platania, P.
Pospieszalski, M.
Poutanen, T.
Prina, M.
Rebolo, R.
Roddis, N.
Rubino-Martin, J. A.
Salmon, M. J.
Sandri, M.
Seiffert, M.
Silvestri, R.
Simonetto, A.
Sjoman, P.
Smoot, G. F.
Sozzi, C.
Stringhetti, L.
Taddei, E.
Tauber, J.
Terenzi, L.
Tomasi, M.
Tuovinen, J.
Valenziano, L.
Varis, J.
Vittorio, N.
Wade, L. A.
Wilkinson, A.
Winder, F.
Zacchei, A.
Zonca, A.
TI Planck pre-launch status: Design and description of the Low Frequency
Instrument
SO ASTRONOMY & ASTROPHYSICS
LA English
DT Article
DE cosmic microwave background; cosmology: observations; space vehicles:
instruments
ID MICROWAVE BACKGROUND ANISOTROPY; 1/F NOISE; LFI INSTRUMENT; RADIOMETERS;
FLUCTUATIONS; TEMPERATURE; PERFORMANCE; MISSION
AB In this paper we present the Low Frequency Instrument (LFI), designed and developed as part of the Planck space mission, the ESA programme dedicated to precision imaging of the cosmic microwave background (CMB). Planck-LFI will observe the full sky in intensity and polarisation in three frequency bands centred at 30, 44 and 70 GHz, while higher frequencies (100-850 GHz) will be covered by the HFI instrument. The LFI is an array of microwave radiometers based on state-of-the-art indium phosphide cryogenic HEMT amplifiers implemented in a differential system using blackbody loads as reference signals. The front end is cooled to 20 K for optimal sensitivity and the reference loads are cooled to 4 K to minimise low-frequency noise. We provide an overview of the LFI, discuss the leading scientific requirements, and describe the design solutions adopted for the various hardware subsystems. The main drivers of the radiometric, optical, and thermal design are discussed, including the stringent requirements on sensitivity, stability, and rejection of systematic effects. Further details on the key instrument units and the results of ground calibration are provided in a set of companion papers.
C1 [Bersanelli, M.; Mennella, A.; Cappellini, B.; Cavaliere, F.; Franceschet, C.; Maino, D.; Perrotta, F.; Tomasi, M.; Zonca, A.] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.
[Bersanelli, M.; Mennella, A.; Cappellini, B.; Zonca, A.] INAF Ist Astrofis Spaziale & Fis Cosm, I-20133 Milan, Italy.
[Mandolesi, N.; Butler, R. C.; Villa, F.; Burigana, C.; Cuttaia, F.; De Rosa, A.; Franceschi, E.; Malaspina, M.; Morgante, G.; Sandri, M.; Stringhetti, L.; Terenzi, L.; Valenziano, L.] INAF Ist Astrofis Spaziale & Fis Cosm, I-40129 Bologna, Italy.
[Aja, B.; Artal, E.; De La Fuente, L.; Mediavilla, A.; Pascual, J. P.] Univ Cantabria, Dept Ingn Comunicac, E-39005 Santander, Spain.
[Artina, E.; Balasini, M.; Baldan, G.; Bastia, P.; Battaglia, P.; Boschini, L.; Cafagna, G.; Colombo, F.; Ferrari, F.; Ferretti, R.; Guzzi, P.; Lapolla, P. M.; Leutenegger, P.; Miccolis, M.; Pagan, L.; Pecora, M.; Perrotta, F.; Silvestri, R.; Taddei, E.] Thales Alenia Space Italia SpA, I-20090 Milan, Italy.
[Baccigalupi, C.; Danese, L.; Perrotta, F.] SISSA ISAS, Astrophys Sector, I-34014 Trieste, Italy.
[Banday, A.] Ctr Etud Spatiale Rayonnements, F-31028 Toulouse 4, France.
[Bernardino, T.; Martinez-Gonzalez, E.; Salmon, M. J.] Univ Cantabria, Inst Fis Cantabria, CSIC, E-39005 Santander, Spain.
[Blackhurst, E.; Davies, R. D.; Davis, R. J.; Kettle, D.; Lawson, D.; Leahy, J. P.; Lowe, S. R.; Roddis, N.; Wilkinson, A.; Winder, F.] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England.
[Crone, G.; Marti-Canales, J.] Sci Projects Dpt ESA, Herschel Planck Project, NL-2200 AG Noordwijk, Netherlands.
[D'Arcangelo, O.; Figini, L.; Garavaglia, S.; Platania, P.; Simonetto, A.; Sozzi, C.] CNR, Ist Fis Plasma, I-20125 Milan, Italy.
[De Angelis, L.; Falvella, M. C.] ASI, I-00198 Rome, Italy.
[De Gasperis, G. C.; Natoli, P.; Vittorio, N.] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy.
[De Zotti, G.] INAF Osservatorio Astron Padova, I-35122 Padua, Italy.
[Baccigalupi, C.; Fogliani, S.; Maris, M.; Pasian, F.; Zacchei, A.] INAF Osservatorio Astron Trieste, I-34143 Trieste, Italy.
[Gaier, T.; Gorski, K.; Janssen, M.; Lawrence, C. R.; Levin, S.; Paine, C.; Pearson, D.; Prina, M.; Seiffert, M.; Wade, L. A.] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.
[Gomez, F.; Herreros, J. M.; Hildebrandt, S. R.; Hoyland, R.; Rebolo, R.; Rubino-Martin, J. A.] Inst Astrofis Canarias, Tenerife 38200, Spain.
[Gregorio, A.] Univ Trieste, Dipartmento Fis, I-34127 Trieste, Italy.
[Hughes, N.; Jukkala, P.; Kilpia, V. H.; Sjoman, P.] DA Design Oy, Jokioinen 31600, Finland.
[Laaninen, M.] Ylinen Elect Oy, Kauniainen 02700, Finland.
[Leonardi, R.; Lubin, P. M.; Meinhold, P.] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA.
[Lilje, P. B.] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway.
[Nesti, R.] INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy.
[Partridge, B.] Haverford Coll, Haverford, PA 19041 USA.
[Pospieszalski, M.] Natl Radio Astron Observ, Charlottesville, VA 22903 USA.
[Poutanen, T.] Univ Helsinki, Dept Phys, Helsinki 00014, Finland.
[Poutanen, T.] Univ Helsinki, Helsinki Inst Phys, FIN-00014 Helsinki, Finland.
[Poutanen, T.] Helsinki Univ Technol, Metsahovi Radio Observ, Kylmala 02540, Finland.
[Smoot, G. F.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Tauber, J.] European Space Agcy, Div Astrophys, NL-2201AZ Noordwijk, Netherlands.
[Tuovinen, J.; Varis, J.] VTT Tech Res Ctr Finland, MilliLab, Espoo 02044, Finland.
[Banday, A.] MPA Max Planck Inst Astrophys, D-85741 Garching, Germany.
RP Bersanelli, M (reprint author), Univ Milan, Dipartimento Fis, Via Celoria 16, I-20133 Milan, Italy.
EM marco.bersanelli@unimi.it
RI Lilje, Per/A-2699-2012; de Gasperis, Giancarlo/C-8534-2012; Sozzi,
Carlo/F-4158-2012; Pascual, Juan Pablo/K-5066-2014; Martinez-Gonzalez,
Enrique/E-9534-2015; de la Fuente, Luisa/J-5142-2012; Artal,
Eduardo/H-5546-2015; Tomasi, Maurizio/I-1234-2016; Aja,
Beatriz/H-5573-2015
OI Burigana, Carlo/0000-0002-3005-5796; Villa,
Fabrizio/0000-0003-1798-861X; GARAVAGLIA, SAUL
FRANCESCO/0000-0002-8433-1901; TERENZI, LUCA/0000-0001-9915-6379;
Zacchei, Andrea/0000-0003-0396-1192; Lilje, Per/0000-0003-4324-7794;
Zonca, Andrea/0000-0001-6841-1058; Morgante,
Gianluca/0000-0001-9234-7412; Maris, Michele/0000-0001-9442-2754;
Franceschi, Enrico/0000-0002-0585-6591; Valenziano,
Luca/0000-0002-1170-0104; Lowe, Stuart/0000-0002-2975-9032; Stringhetti,
Luca/0000-0002-3961-9068; Pasian, Fabio/0000-0002-4869-3227; Gregorio,
Anna/0000-0003-4028-8785; Sandri, Maura/0000-0003-4806-5375; Cuttaia,
Francesco/0000-0001-6608-5017; Rubino-Martin, Jose
Alberto/0000-0001-5289-3021; Nesti, Renzo/0000-0003-0303-839X; de
Gasperis, Giancarlo/0000-0003-2899-2171; Sozzi,
Carlo/0000-0001-8951-0071; Pascual, Juan Pablo/0000-0003-2123-0502;
Martinez-Gonzalez, Enrique/0000-0002-0179-8590; de la Fuente,
Luisa/0000-0003-1403-1660; Artal, Eduardo/0000-0002-2569-1894; Tomasi,
Maurizio/0000-0002-1448-6131; Aja, Beatriz/0000-0002-4229-2334
FU Italian Space Agency (ASI); Academy of Finland [205800, 214598, 121703,
121962]; Waldemar von Frenckells Stiftelse; Magnus Ehrnrooth Foundation;
Vaisala Foundation; NASA LTSA [NNG04CG90G]
FX The Planck-LFI project is developed by an International Consortium led
by Italy and involving Canada, Finland, Germany, Norway, Spain,
Switzerland, UK, USA. The Italian contribution to Planck is supported by
the Italian Space Agency (ASI). T.P.'s work was supported in part by the
Academy of Finland grants 205800, 214598, 121703, and 121962. T. P.
thanks the Waldemar von Frenckells Stiftelse, Magnus Ehrnrooth
Foundation, and Vaisala Foundation for financial support. We acknowledge
partial support from the NASA LTSA Grant NNG04CG90G.
NR 53
TC 97
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U1 2
U2 14
PU EDP SCIENCES S A
PI LES ULIS CEDEX A
PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A,
FRANCE
SN 0004-6361
J9 ASTRON ASTROPHYS
JI Astron. Astrophys.
PD SEP-OCT
PY 2010
VL 520
AR A4
DI 10.1051/0004-6361/200912853
PG 21
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 665VQ
UT WOS:000283064200005
ER
PT J
AU Leahy, JP
Bersanelli, M
D'Arcangelo, O
Ganga, K
Leach, SM
Moss, A
Keihanen, E
Keskitalo, R
Kurki-Suonio, H
Poutanen, T
Sandri, M
Scott, D
Tauber, J
Valenziano, L
Villa, F
Wilkinson, A
Zonca, A
Baccigalupi, C
Borrill, J
Butler, RC
Cuttaia, F
Davis, RJ
Frailis, M
Francheschi, E
Galeotta, S
Gregorio, A
Leonardi, R
Mandolesi, N
Maris, M
Meinhold, P
Mendes, L
Mennella, A
Morgante, G
Prezeau, G
Rocha, G
Stringhetti, L
Terenzi, L
Tomasi, M
AF Leahy, J. P.
Bersanelli, M.
D'Arcangelo, O.
Ganga, K.
Leach, S. M.
Moss, A.
Keihanen, E.
Keskitalo, R.
Kurki-Suonio, H.
Poutanen, T.
Sandri, M.
Scott, D.
Tauber, J.
Valenziano, L.
Villa, F.
Wilkinson, A.
Zonca, A.
Baccigalupi, C.
Borrill, J.
Butler, R. C.
Cuttaia, F.
Davis, R. J.
Frailis, M.
Francheschi, E.
Galeotta, S.
Gregorio, A.
Leonardi, R.
Mandolesi, N.
Maris, M.
Meinhold, P.
Mendes, L.
Mennella, A.
Morgante, G.
Prezeau, G.
Rocha, G.
Stringhetti, L.
Terenzi, L.
Tomasi, M.
TI Planck pre-launch status: Expected LFI polarisation capability
SO ASTRONOMY & ASTROPHYSICS
LA English
DT Article
DE polarization; instrumentation: polarimeters; space vehicles:
instruments; techniques: polarimetric; cosmic microwave background
ID UNDERSTANDING RADIO POLARIMETRY; PROBE WMAP OBSERVATIONS; MAP-MAKING
METHOD; 30 GHZ DATA; POWER SPECTRUM; CRAB-NEBULA; MICROWAVE; ANISOTROPY;
DEFINITIONS; CALIBRATION
AB We present a system-level description of the Low Frequency Instrument (LFI) considered as a differencing polarimeter, and evaluate its expected performance. The LFI is one of the two instruments on board the ESA Planck mission to study the cosmic microwave background. It consists of a set of 22 radiometers sensitive to linear polarisation, arranged in orthogonally-oriented pairs connected to 11 feed horns operating at 30, 44 and 70 GHz. In our analysis, the generic Jones and Mueller-matrix formulations for polarimetry are adapted to the special case of the LFI. Laboratory measurements of flight components are combined with optical simulations of the telescope to investigate the values and uncertainties in the system parameters affecting polarisation response. Methods of correcting residual systematic errors are also briefly discussed. The LFI has beam-integrated polarisation efficiency >99% for all detectors, with uncertainties below 0.1%. Indirect assessment of polarisation position angles suggests that uncertainties are generally less than 0 degrees.5, and this will be checked in flight using observations of the Crab nebula. Leakage of total intensity into the polarisation signal is generally well below the thermal noise level except for bright Galactic emission, where the dominant effect is likely to be spectral-dependent terms due to bandpass mismatch between the two detectors behind each feed, contributing typically 1-3% leakage of foreground total intensity. Comparable leakage from compact features occurs due to beam mismatch, but this averages to < 5 x 10(-4) for large-scale emission. An inevitable feature of the LFI design is that the two components of the linear polarisation are recovered from elliptical beams which differ substantially in orientation. This distorts the recovered polarisation and its angular power spectrum, and several methods are being developed to correct the effect, both in the power spectrum and in the sky maps. The LFI will return a high-quality measurement of the CMB polarisation, limited mainly by thermal noise. To meet our aspiration of measuring polarisation at the 1% level, further analysis of flight and ground data is required. We are still researching the most effective techniques for correcting subtle artefacts in polarisation; in particular the correction of bandpass mismatch effects is a formidable challenge, as it requires multi-band analysis to estimate the spectral indices that control the leakage.
C1 [Leahy, J. P.; Wilkinson, A.; Davis, R. J.] Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England.
[Leahy, J. P.; Frailis, M.; Galeotta, S.; Maris, M.] Osservatorio Astron Trieste INAF, I-34143 Trieste, Italy.
[Bersanelli, M.; Zonca, A.; Tomasi, M.] Univ Milan, Dipartimento Fis, I-20122 Milan, Italy.
[Bersanelli, M.; Zonca, A.; Mennella, A.] INAF, IASF Sez Milano, Milan, Italy.
[D'Arcangelo, O.] Ist Fis Plasma CNR, I-20125 Milan, Italy.
[Ganga, K.] CNRS, Lab APC, F-75205 Paris 13, France.
[Leach, S. M.; Baccigalupi, C.] SISSA, ISAS, Astrophys Sect, I-34014 Trieste, Italy.
[Leach, S. M.; Baccigalupi, C.] Ist Nazl Fis Nucl, Sez Trieste, I-34014 Trieste, Italy.
[Moss, A.; Scott, D.] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada.
[Keihanen, E.; Keskitalo, R.; Kurki-Suonio, H.; Poutanen, T.] Univ Helsinki, Dept Phys, Helsinki 00014, Finland.
[Keskitalo, R.; Kurki-Suonio, H.; Poutanen, T.] Helsinki Inst Phys, Helsinki 00014, Finland.
[Poutanen, T.] Helsinki Univ Technol, Metsahovi Radio Observ, TKK, Kylmala 02540, Finland.
[Sandri, M.; Valenziano, L.; Villa, F.; Butler, R. C.; Cuttaia, F.; Francheschi, E.; Mandolesi, N.; Morgante, G.; Stringhetti, L.; Terenzi, L.] INAF, Ist Astrofis Spaziale & Fis Cosm, Sez Bologna, Bologna, Italy.
[Tauber, J.] European Space Agcy, Div Astrophys, NL-2201 AZ Noordwijk, Netherlands.
[Baccigalupi, C.] INAF Trieste, I-34131 Trieste, Italy.
[Borrill, J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Cosmol Ctr, Berkeley, CA 94720 USA.
[Borrill, J.] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
[Gregorio, A.] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy.
[Leonardi, R.; Meinhold, P.] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93110 USA.
[Mendes, L.] European Space Astron Ctr, European Space Agcy, Planck Sci Off, Madrid 28691, Spain.
[Prezeau, G.; Rocha, G.] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.
[Rocha, G.] CALTECH, Dept Phys, Pasadena, CA 91125 USA.
RP Leahy, JP (reprint author), Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England.
EM j.p.leahy@manchester.ac.uk
RI Kurki-Suonio, Hannu/B-8502-2016; Tomasi, Maurizio/I-1234-2016;
OI Cuttaia, Francesco/0000-0001-6608-5017; Frailis,
Marco/0000-0002-7400-2135; Villa, Fabrizio/0000-0003-1798-861X;
Galeotta, Samuele/0000-0002-3748-5115; TERENZI,
LUCA/0000-0001-9915-6379; Maris, Michele/0000-0001-9442-2754; Zonca,
Andrea/0000-0001-6841-1058; Morgante, Gianluca/0000-0001-9234-7412;
Valenziano, Luca/0000-0002-1170-0104; Kurki-Suonio,
Hannu/0000-0002-4618-3063; Tomasi, Maurizio/0000-0002-1448-6131;
Stringhetti, Luca/0000-0002-3961-9068; Scott,
Douglas/0000-0002-6878-9840; Gregorio, Anna/0000-0003-4028-8785; Sandri,
Maura/0000-0003-4806-5375
FU Italian Space Agency (ASI); Science and Technology Facilities Council
(STFC); Finnish Funding Agency for Technology and Innovation (Tekes);
Academy of Finland; Canadian Space Agency; NASA LTSA [NNG04CG90G]; ESA
FX Planck (http://www.esa.int/Planck) is a project of the European Space
Agency - ESA - with instruments provided by two scientific Consortia
funded by ESA member states (in particular the lead countries: France
and Italy) with contributions from NASA (USA), and telescope reflectors
provided in a collaboration between ESA and a scientific Consortium led
and funded by Denmark.; J.P.L. thanks Johan Hamaker for a fruitful
collaboration (Hamaker & Leahy 2004) which has significantly influenced
the presentation in this paper. J.P.L. also thanks the Osservatorio
Astronomico di Trieste for hospitality while much of this paper was
written. We thank the referee for a perceptive review. The Planck-LFI
project is developed by an International Consortium led by Italy and
involving Canada, Finland, Germany, Norway, Spain, Switzerland, UK, USA.
The Italian contribution to Planck is supported by the Italian Space
Agency (ASI). The UK contribution is supported by the Science and
Technology Facilities Council (STFC). The Finnish contribution is
supported by the Finnish Funding Agency for Technology and Innovation
(Tekes) and the Academy of Finland. The Canadian contribution is
supported by the Canadian Space Agency. We wish to thank people of the
Herschel/Planck Project of ESA, ASI, THALES Alenia Space Industries, and
the LFI Consortium that are involved in activities related to optical
simulations and the measurement and modelling of the radiometer
performance. We acknowledge the use of the Planck sky model, developed
by the Component Separation Working Group (WG2) of the Planck
Collaboration. We thank the members of the Planck CTP working group for
the preparation and validation of the Trieste simulations. Some of the
results in this paper have been derived using the HEALPix (Gorski et al.
1999). We acknowledge the use of the Legacy Archive for Microwave
Background Data Analysis (LAMBDA). Support for LAMBDA is provided by the
NASA Office of Space Science. This research has made use of NASA's
Astrophysics Data System. We acknowledge partial support of the NASA
LTSA Grant NNG04CG90G.
NR 55
TC 60
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U1 0
U2 7
PU EDP SCIENCES S A
PI LES ULIS CEDEX A
PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A,
FRANCE
SN 0004-6361
J9 ASTRON ASTROPHYS
JI Astron. Astrophys.
PD SEP-OCT
PY 2010
VL 520
AR A8
DI 10.1051/0004-6361/200912855
PG 26
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 665VQ
UT WOS:000283064200009
ER
PT J
AU Mandolesi, N
Bersanelli, M
Butler, RC
Artal, E
Baccigalupi, C
Balbi, A
Banday, AJ
Barreiro, RB
Bartelmann, M
Bennett, K
Bhandari, P
Bonaldi, A
Borrill, J
Bremer, M
Burigana, C
Bowman, RC
Cabella, P
Cantalupo, C
Cappellini, B
Courvoisier, T
Crone, G
Cuttaia, F
Danese, L
D'Arcangelo, O
Davies, RD
Davis, RJ
De Angelis, L
de Gasperis, G
De Rosa, A
De Troia, G
de Zotti, G
Dick, J
Dickinson, C
Diego, JM
Donzelli, S
Dorl, U
Dupac, X
Ensslin, TA
Eriksen, HK
Falvella, MC
Finelli, F
Frailis, M
Franceschi, E
Gaier, T
Galeotta, S
Gasparo, F
Giardino, G
Gomez, F
Gonzalez-Nuevo, J
Gorski, KM
Gregorio, A
Gruppuso, A
Hansen, F
Hell, R
Herranz, D
Herreros, JM
Hildebrandt, S
Hovest, W
Hoyland, R
Huffenberger, K
Janssen, M
Jaffe, T
Keihanen, E
Keskitalo, R
Kisner, T
Kurki-Suonio, H
Lahteenmaki, A
Lawrence, CR
Leach, SM
Leahy, JP
Leonardi, R
Levin, S
Lilje, PB
Lopez-Caniego, M
Lowe, SR
Lubin, PM
Maino, D
Malaspina, M
Maris, M
Marti-Canales, J
Martinez-Gonzalez, E
Massardi, M
Matarrese, S
Matthai, F
Meinhold, P
Melchiorri, A
Mendes, L
Mennella, A
Morgante, G
Morigi, G
Morisset, N
Moss, A
Nash, A
Natoli, P
Nesti, R
Paine, C
Partridge, B
Pasian, F
Passvogel, T
Pearson, D
Perez-Cuevas, L
Perrotta, F
Polenta, G
Popa, LA
Poutanen, T
Prezeau, G
Prina, M
Rachen, JP
Rebolo, R
Reinecke, M
Ricciardi, S
Riller, T
Rocha, G
Roddis, N
Rohlfs, R
Rubino-Martin, JA
Salerno, E
Sandri, M
Scott, D
Seiffert, M
Silk, J
Simonetto, A
Smoot, GF
Sozzi, C
Sternberg, J
Stivoli, F
Stringhetti, L
Tauber, J
Terenzi, L
Tomasi, M
Tuovinen, J
Turler, M
Valenziano, L
Varis, J
Vielva, P
Villa, F
Vittorio, N
Wade, L
White, M
White, S
Wilkinson, A
Zacchei, A
Zonca, A
AF Mandolesi, N.
Bersanelli, M.
Butler, R. C.
Artal, E.
Baccigalupi, C.
Balbi, A.
Banday, A. J.
Barreiro, R. B.
Bartelmann, M.
Bennett, K.
Bhandari, P.
Bonaldi, A.
Borrill, J.
Bremer, M.
Burigana, C.
Bowman, R. C.
Cabella, P.
Cantalupo, C.
Cappellini, B.
Courvoisier, T.
Crone, G.
Cuttaia, F.
Danese, L.
D'Arcangelo, O.
Davies, R. D.
Davis, R. J.
De Angelis, L.
de Gasperis, G.
De Rosa, A.
De Troia, G.
de Zotti, G.
Dick, J.
Dickinson, C.
Diego, J. M.
Donzelli, S.
Doerl, U.
Dupac, X.
Ensslin, T. A.
Eriksen, H. K.
Falvella, M. C.
Finelli, F.
Frailis, M.
Franceschi, E.
Gaier, T.
Galeotta, S.
Gasparo, F.
Giardino, G.
Gomez, F.
Gonzalez-Nuevo, J.
Gorski, K. M.
Gregorio, A.
Gruppuso, A.
Hansen, F.
Hell, R.
Herranz, D.
Herreros, J. M.
Hildebrandt, S.
Hovest, W.
Hoyland, R.
Huffenberger, K.
Janssen, M.
Jaffe, T.
Keihanen, E.
Keskitalo, R.
Kisner, T.
Kurki-Suonio, H.
Lahteenmaki, A.
Lawrence, C. R.
Leach, S. M.
Leahy, J. P.
Leonardi, R.
Levin, S.
Lilje, P. B.
Lopez-Caniego, M.
Lowe, S. R.
Lubin, P. M.
Maino, D.
Malaspina, M.
Maris, M.
Marti-Canales, J.
Martinez-Gonzalez, E.
Massardi, M.
Matarrese, S.
Matthai, F.
Meinhold, P.
Melchiorri, A.
Mendes, L.
Mennella, A.
Morgante, G.
Morigi, G.
Morisset, N.
Moss, A.
Nash, A.
Natoli, P.
Nesti, R.
Paine, C.
Partridge, B.
Pasian, F.
Passvogel, T.
Pearson, D.
Perez-Cuevas, L.
Perrotta, F.
Polenta, G.
Popa, L. A.
Poutanen, T.
Prezeau, G.
Prina, M.
Rachen, J. P.
Rebolo, R.
Reinecke, M.
Ricciardi, S.
Riller, T.
Rocha, G.
Roddis, N.
Rohlfs, R.
Rubino-Martin, J. A.
Salerno, E.
Sandri, M.
Scott, D.
Seiffert, M.
Silk, J.
Simonetto, A.
Smoot, G. F.
Sozzi, C.
Sternberg, J.
Stivoli, F.
Stringhetti, L.
Tauber, J.
Terenzi, L.
Tomasi, M.
Tuovinen, J.
Tuerler, M.
Valenziano, L.
Varis, J.
Vielva, P.
Villa, F.
Vittorio, N.
Wade, L.
White, M.
White, S.
Wilkinson, A.
Zacchei, A.
Zonca, A.
TI Planck pre-launch status: The Planck-LFI programme
SO ASTRONOMY & ASTROPHYSICS
LA English
DT Article
DE cosmic microwave background; space vehicles: instruments;
instrumentation: detectors; instrumentation: polarimeters;
submillimeter: general; telescopes
ID MICROWAVE BACKGROUND MAPS; LOW-FREQUENCY INSTRUMENT; DATA-PROCESSING
CENTERS; ANGULAR POWER SPECTRA; LARGE-AREA TELESCOPE; DMR SKY MAPS;
NON-GAUSSIANITY; STRAYLIGHT CONTAMINATION; GALACTIC FOREGROUNDS;
COMPONENT SEPARATION
AB This paper provides an overview of the Low Frequency Instrument (LFI) programme within the ESA Planck mission. The LFI instrument has been developed to produce high precision maps of the microwave sky at frequencies in the range 27-77 GHz, below the peak of the cosmic microwave background (CMB) radiation spectrum. The scientific goals are described, ranging from fundamental cosmology to Galactic and extragalactic astrophysics. The instrument design and development are outlined, together with the model philosophy and testing strategy. The instrument is presented in the context of the Planck mission. The LFI approach to ground and inflight calibration is described. We also describe the LFI ground segment. We present the results of a number of tests demonstrating the capability of the LFI data processing centre (DPC) to properly reduce and analyse LFI flight data, from telemetry information to calibrated and cleaned time ordered data, sky maps at each frequency (in temperature and polarization), component emission maps (CMB and diffuse foregrounds), catalogs for various classes of sources (the Early Release Compact Source Catalogue and the Final Compact Source Catalogue). The organization of the LFI consortium is briefly presented as well as the role of the core team in data analysis and scientific exploitation. All tests carried out on the LFI flight model demonstrate the excellent performance of the instrument and its various subunits. The data analysis pipeline has been tested and its main steps verified. In the first three months after launch, the commissioning, calibration,
C1 [Mandolesi, N.; Butler, R. C.; Burigana, C.; Cuttaia, F.; De Rosa, A.; Finelli, F.; Gruppuso, A.; Malaspina, M.; Morgante, G.; Morigi, G.; Natoli, P.; Ricciardi, S.; Sandri, M.; Stringhetti, L.; Terenzi, L.; Valenziano, L.; Villa, F.] INAF IASF Bologna, Ist Nazl Astrofis, Ist Astrofis Spaziale & Fis Cosm Bologna, I-40129 Bologna, Italy.
[Bersanelli, M.; Cappellini, B.; Maino, D.; Mennella, A.; Tomasi, M.; Zonca, A.] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy.
[Bonaldi, A.; de Zotti, G.; Massardi, M.] INAF OAPd, Ist Nazl Astrofis, Osservatorio Astron Padova, I-35122 Padua, Italy.
[Matarrese, S.] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy.
[Balbi, A.; Cabella, P.; de Gasperis, G.; De Troia, G.; Natoli, P.; Vittorio, N.] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy.
[Baccigalupi, C.; Frailis, M.; Galeotta, S.; Gasparo, F.; Maris, M.; Pasian, F.; Zacchei, A.] INAF OATs, Ist Nazl Astrofis, Osservatorio Astron Trieste, I-34131 Trieste, Italy.
[Artal, E.] Univ Cantabria, Dep Ing Comunicac DICOM, E-39005 Santander, Spain.
[Baccigalupi, C.; Danese, L.; Dick, J.; Gonzalez-Nuevo, J.; Leach, S. M.; Perrotta, F.] SISSA, ISAS, Astrophys Sect, Sez Trieste, I-34014 Trieste, Italy.
[Banday, A. J.; Bartelmann, M.; Doerl, U.; Ensslin, T. A.; Hell, R.; Hovest, W.; Matthai, F.; Rachen, J. P.; Reinecke, M.; Riller, T.; White, S.] MPA Max Planck Inst Astrophys, D-85741 Garching, Germany.
[Bhandari, P.; Bowman, R. C.; Gaier, T.; Gorski, K. M.; Janssen, M.; Lahteenmaki, A.; Levin, S.; Nash, A.; Paine, C.; Pearson, D.; Prezeau, G.; Prina, M.; Rocha, G.; Seiffert, M.; Wade, L.] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.
[Courvoisier, T.; Morisset, N.; Rohlfs, R.; Tuerler, M.] Univ Geneva, ISDC Data Ctr Astrophys, CH-1290 Versoix, Switzerland.
[Crone, G.; Marti-Canales, J.; Passvogel, T.; Perez-Cuevas, L.] ESA, Sci Projects Dpt, Herschel Planck Project, NL-2200 AG Noordwijk, Netherlands.
[D'Arcangelo, O.; Simonetto, A.; Sozzi, C.] IFP CNR, Ist Fis Plasma, Consiglio Nazl Ric, I-20125 Milan, Italy.
[Davies, R. D.; Davis, R. J.; Dickinson, C.; Jaffe, T.; Leahy, J. P.; Lowe, S. R.; Roddis, N.; Wilkinson, A.] Univ Manchester, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England.
[De Angelis, L.; Falvella, M. C.] ASI, Agenzia Spaziale Italiana, I-00198 Rome, Italy.
[Gregorio, A.] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy.
[Barreiro, R. B.; Diego, J. M.; Herranz, D.; Lopez-Caniego, M.; Martinez-Gonzalez, E.; Vielva, P.] Univ Cantabria, CSIC, Inst Fis Cantabria, E-39005 Santander, Spain.
[Gomez, F.; Herreros, J. M.; Hildebrandt, S.; Hoyland, R.; Rebolo, R.; Rubino-Martin, J. A.] Inst Astrofis Canarias, Tenerife 38200, Spain.
[Keihanen, E.; Keskitalo, R.; Kurki-Suonio, H.; Poutanen, T.] Univ Helsinki, Dept Phys, Helsinki 00014, Finland.
[Poutanen, T.] Helsinki Univ Technol, Metsahovi Radio Observ, TKK, Kylmala 02540, Finland.
[Leonardi, R.; Lubin, P. M.; Meinhold, P.] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA.
[Donzelli, S.; Eriksen, H. K.; Hansen, F.; Lilje, P. B.] Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway.
[Donzelli, S.; Eriksen, H. K.; Hansen, F.; Lilje, P. B.] Univ Oslo, Ctr Math Applicat, N-0316 Oslo, Norway.
[Mendes, L.] ESA ESAC RSSD, European Space Agcy, European Space Astron Ctr, Res & Sci Support Dept, Madrid 28691, Spain.
[Nesti, R.] Osserv Astrofis Arcetri, I-50125 Florence, Italy.
[Partridge, B.] Haverford Coll, Dept Astron, Haverford, PA 19041 USA.
[Bennett, K.; Bremer, M.; Giardino, G.; Sternberg, J.; Tauber, J.] Estec, ESA, Res & Sci Support Dept, NL-2201 AZ Noordwijk, Netherlands.
[Popa, L. A.] Inst Space Sci, RO-077125 Bucharest, Romania.
[Smoot, G. F.] Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Phys, Berkeley, CA 94720 USA.
[Smoot, G. F.] Univ Calif Berkeley, Berkeley Ctr Cosmol Phys, Dept Phys, Berkeley, CA 94720 USA.
[Moss, A.; Scott, D.] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada.
[Silk, J.] Univ Oxford, Oxford OX1 3RH, England.
[Smoot, G. F.] Univ Paris 07, APC, Case 7020, F-75205 Paris 13, France.
[Tuovinen, J.; Varis, J.] VTT Tech Res Ctr Finland, MilliLab, Espoo 02044, Finland.
[Keskitalo, R.; Kurki-Suonio, H.; Poutanen, T.] Helsinki Inst Phys, Helsinki 00014, Finland.
[Finelli, F.] INAF OABo, Ist Nazl Astrofis, Osservatorio Astron Bologna, I-40127 Bologna, Italy.
[Baccigalupi, C.; Leach, S. M.] Ist Nazl Fis Nucl, Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy.
[Natoli, P.; Vittorio, N.] Ist Nazl Fis Nucl, Ist Nazl Fis Nucl, Sez Tor Vergata, I-00133 Rome, Italy.
[Borrill, J.; Ricciardi, S.; Stivoli, F.] Univ Calif Berkeley, Berkeley Space Sci Lab, Berkeley, CA 94720 USA.
[Borrill, J.; Cantalupo, C.; Kisner, T.; Ricciardi, S.; Stivoli, F.] Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Cosmol Ctr, Berkeley, CA 94720 USA.
[Banday, A. J.] CESR, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse 4, France.
[Dupac, X.] ESA, ESAC, European Space Agcy, European Space Astron Ctr, Madrid 28080, Spain.
[Gorski, K. M.] Univ Warsaw Observ, PL-00478 Warsaw, Poland.
[Lopez-Caniego, M.] Univ Cambridge, Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England.
[Huffenberger, K.] Univ Miami, Dept Phys, Coral Gables, FL 33124 USA.
[Natoli, P.; Polenta, G.] ASI, Agenzia Spaziale Italiana, Sci Data Ctr, I-00044 Frascati, Italy.
[Cabella, P.; Melchiorri, A.; Polenta, G.] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy.
[Polenta, G.] INAF OARo, Ist Nazl Astrofis, Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy.
[Salerno, E.] CNR, Consiglio Nazl Ric, Area Ric Pisa, Ist Scie & Technol Informaz Alessandro Faedo, I-56124 Pisa, Italy.
[White, M.] Univ Calif Berkeley, Dept Phys & Astron, Berkeley, CA 94720 USA.
RP Mandolesi, N (reprint author), INAF IASF Bologna, Ist Nazl Astrofis, Ist Astrofis Spaziale & Fis Cosm Bologna, Via Gobetti 101, I-40129 Bologna, Italy.
EM mandolesi@iasfbo.inaf.it
RI Gonzalez-Nuevo, Joaquin/I-3562-2014; White, Martin/I-3880-2015;
Gruppuso, Alessandro/N-5592-2015; Kurki-Suonio, Hannu/B-8502-2016;
Tomasi, Maurizio/I-1234-2016; popa, lucia/B-4718-2012; Lilje,
Per/A-2699-2012; Artal, Eduardo/H-5546-2015; Salerno,
Emanuele/A-2137-2010; de Gasperis, Giancarlo/C-8534-2012; Sozzi,
Carlo/F-4158-2012; Gregorio, Anna/J-1632-2012; Lopez-Caniego,
Marcos/M-4695-2013; Bartelmann, Matthias/A-5336-2014; Lahteenmaki,
Anne/L-5987-2013; Vielva, Patricio/F-6745-2014; Herranz,
Diego/K-9143-2014; Barreiro, Rita Belen/N-5442-2014; Martinez-Gonzalez,
Enrique/E-9534-2015; Butler, Reginald/N-4647-2015;
OI Gonzalez-Nuevo, Joaquin/0000-0003-1354-6822; White,
Martin/0000-0001-9912-5070; Gruppuso, Alessandro/0000-0001-9272-5292;
Kurki-Suonio, Hannu/0000-0002-4618-3063; Tomasi,
Maurizio/0000-0002-1448-6131; Rubino-Martin, Jose
Alberto/0000-0001-5289-3021; Lopez-Caniego, Marcos/0000-0003-1016-9283;
Melchiorri, Alessandro/0000-0001-5326-6003; Morgante,
Gianluca/0000-0001-9234-7412; Maris, Michele/0000-0001-9442-2754; Artal,
Eduardo/0000-0002-2569-1894; Salerno, Emanuele/0000-0002-3433-3634; de
Gasperis, Giancarlo/0000-0003-2899-2171; Sozzi,
Carlo/0000-0001-8951-0071; Vielva, Patricio/0000-0003-0051-272X;
Herranz, Diego/0000-0003-4540-1417; Barreiro, Rita
Belen/0000-0002-6139-4272; Martinez-Gonzalez,
Enrique/0000-0002-0179-8590; Franceschi, Enrico/0000-0002-0585-6591;
Valenziano, Luca/0000-0002-1170-0104; Matarrese,
Sabino/0000-0002-2573-1243; Lowe, Stuart/0000-0002-2975-9032;
Stringhetti, Luca/0000-0002-3961-9068; Pasian,
Fabio/0000-0002-4869-3227; Finelli, Fabio/0000-0002-6694-3269; Scott,
Douglas/0000-0002-6878-9840; Nesti, Renzo/0000-0003-0303-839X; Gregorio,
Anna/0000-0003-4028-8785; Polenta, Gianluca/0000-0003-4067-9196; Butler,
Reginald/0000-0003-4366-5996; Sandri, Maura/0000-0003-4806-5375;
Cuttaia, Francesco/0000-0001-6608-5017; Burigana,
Carlo/0000-0002-3005-5796; Frailis, Marco/0000-0002-7400-2135;
Ricciardi, Sara/0000-0002-3807-4043; Huffenberger,
Kevin/0000-0001-7109-0099; Villa, Fabrizio/0000-0003-1798-861X; silk,
joe/0000-0002-1566-8148; Galeotta, Samuele/0000-0002-3748-5115; TERENZI,
LUCA/0000-0001-9915-6379; Zacchei, Andrea/0000-0003-0396-1192; Lilje,
Per/0000-0003-4324-7794; Bowman, Robert/0000-0002-2114-1713
FU ESA; Bundesministerium fur Wirtschaft und Technologie through the
Raumfahrt-Agentur of the Deutsches Zentrum fur Luft- und Raumfahrt (DLR)
[FKZ: 50 OP 0901]; Max-Planck-Gesellschaft (MPG); Finnish Funding Agency
for Technology and Innovation (Tekes); Academy of Finland; Ministerio de
Ciencia e Innovacion [ESP2004-07067-C03, AYA2007-68058-C03]; Science and
Technology Facilities Council (STFC); NASA LTSA [NNG04CG90G]; NASA
Office of Space Science; Canadian Space Agency
FX Planck is a project of the European Space Agency with instruments funded
by ESA member states, and with special contributions from Denmark and
NASA (USA). The Planck-LFI project is developed by an International
Consortium led by Italy and involving Canada, Finland, Germany, Norway,
Spain, Switzerland, UK and USA. The Italian contribution to Planck is
supported by the Agenzia Spaziale Italiana (ASI) and INAF. We also wish
to thank the many people of the Herschel/Planck Project and RSSD of ESA,
ASI, THALES Alenia Space Industries and the LFI Consortium that have
contributed to the realization of LFI. We are grateful to our HFI
colleagues for such a fruitful collaboration during so many years of
common work. The German participation at the Max-Planck-Institut fur
Astrophysik is funded by the Bundesministerium fur Wirtschaft und
Technologie through the Raumfahrt-Agentur of the Deutsches Zentrum fur
Luft- und Raumfahrt (DLR) [FKZ: 50 OP 0901] and by the
Max-Planck-Gesellschaft (MPG). The Finnish contribution is supported by
the Finnish Funding Agency for Technology and Innovation (Tekes) and the
Academy of Finland. The Spanish participation is funded by Ministerio de
Ciencia e Innovacion through the project ESP2004-07067-C03 and
AYA2007-68058-C03. The UK contribution is supported by the Science and
Technology Facilities Council (STFC). C. Baccigalupi and F. Perrotta
acknowledge partial support of the NASA LTSA Grant NNG04CG90G. We
acknowledge the use of the BCX cluster at CINECA under the agreement
INAF/CINECA. We acknowledge the use of the Legacy Archive for Microwave
Background Data Analysis (LAMBDA). Support for LAMBDA is provided by the
NASA Office of Space Science. We acknowledge use of the HEALPix (Gorski
et al. 2005) software and analysis package for deriving some of the
results in this paper. The Canadian participation is supported by the
Canadian Space Agency.
NR 135
TC 74
Z9 74
U1 1
U2 14
PU EDP SCIENCES S A
PI LES ULIS CEDEX A
PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A,
FRANCE
SN 0004-6361
J9 ASTRON ASTROPHYS
JI Astron. Astrophys.
PD SEP-OCT
PY 2010
VL 520
AR A3
DI 10.1051/0004-6361/200912837
PG 24
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 665VQ
UT WOS:000283064200004
ER
PT J
AU Tauber, JA
Mandolesi, N
Puget, JL
Banos, T
Bersanelli, M
Bouchet, FR
Butler, RC
Charra, J
Crone, G
Dodsworth, J
Efstathiou, G
Gispert, R
Guyot, G
Gregorio, A
Juillet, JJ
Lamarre, JM
Laureijs, RJ
Lawrence, CR
Norgaard-Nielsen, HU
Passvogel, T
Reix, JM
Texier, D
Vibert, L
Zacchei, A
Ade, PAR
Aghanim, N
Aja, B
Alippi, E
Aloy, L
Armand, P
Arnaud, M
Arondel, A
Arreola-Villanueva, A
Artal, E
Artina, E
Arts, A
Ashdown, M
Aumont, J
Azzaro, M
Bacchetta, A
Baccigalupi, C
Baker, M
Balasini, M
Balbi, A
Banday, AJ
Barbier, G
Barreiro, RB
Bartelmann, M
Battaglia, P
Battaner, E
Benabed, K
Beney, JL
Beneyton, R
Bennett, K
Benoit, A
Bernard, JP
Bhandari, P
Bhatia, R
Biggi, M
Biggins, R
Billig, G
Blanc, Y
Blavot, H
Bock, JJ
Bonaldi, A
Bond, R
Bonis, J
Borders, J
Borrill, J
Boschini, L
Boulanger, F
Bouvier, J
Bouzit, M
Bowman, R
Breelle, E
Bradshaw, T
Braghin, M
Bremer, M
Brienza, D
Broszkiewicz, D
Burigana, C
Burkhalter, M
Cabella, P
Cafferty, T
Cairola, M
Caminade, S
Camus, P
Cantalupo, CM
Cappellini, B
Cardoso, JF
Carr, R
Catalano, A
Cayon, L
Cesa, M
Chaigneau, M
Challinor, A
Chamballu, A
Chambelland, JP
Charra, M
Chiang, LY
Chlewicki, G
Christensen, PR
Church, S
Ciancietta, E
Cibrario, M
Cizeron, R
Clements, D
Collaudin, B
Colley, JM
Colombi, S
Colombo, A
Colombo, F
Corre, O
Couchot, F
Cougrand, B
Coulais, A
Couzin, P
Crane, B
Crill, B
Crook, M
Crumb, D
Cuttaia, F
Dorl, U
da Silva, P
Daddato, R
Damasio, C
Danese, L
d'Aquino, G
D'Arcangelo, O
Dassas, K
Davies, RD
Davies, W
Davis, RJ
De Bernardis, P
de Chambure, D
de Gasperis, G
De la Fuente, ML
De Paco, P
De Rosa, A
De Troia, G
De Zotti, G
Dehamme, M
Delabrouille, J
Delouis, JM
Desert, FX
di Girolamo, G
Dickinson, C
Doelling, E
Dolag, K
Domken, I
Douspis, M
Doyle, D
Du, S
Dubruel, D
Dufour, C
Dumesnil, C
Dupac, X
Duret, P
Eder, C
Elfving, A
Ensslin, TA
Eng, P
English, K
Eriksen, HK
Estaria, P
Falvella, MC
Ferrari, F
Finelli, F
Fishman, A
Fogliani, S
Foley, S
Fonseca, A
Forma, G
Forni, O
Fosalba, P
Fourmond, JJ
Frailis, M
Franceschet, C
Franceschi, E
Francois, S
Frerking, M
Gomez-Renasco, MF
Gorski, KM
Gaier, TC
Galeotta, S
Ganga, K
Lazaro, JG
Gavila, E
Giard, M
Giardino, G
Gienger, G
Giraud-Heraud, Y
Glorian, JM
Griffin, M
Gruppuso, A
Guglielmi, L
Guichon, D
Guillaume, B
Guillouet, P
Haissinski, J
Hansen, FK
Hardy, J
Harrison, D
Hazell, A
Hechler, M
Heckenauer, V
Heinzer, D
Hell, R
Henrot-Versille, S
Hernandez-Monteagudo, C
Herranz, D
Herreros, JM
Hervier, V
Heske, A
Heurtel, A
Hildebrandt, SR
Hills, R
Hivon, E
Hobson, M
Hollert, D
Holmes, W
Hornstrup, A
Hovest, W
Hoyland, RJ
Huey, G
Huffenberger, KM
Hughes, N
Israelsson, U
Jackson, B
Jaffe, A
Jaffe, TR
Jagemann, T
Jessen, NC
Jewell, J
Jones, W
Juvela, M
Kaplan, J
Karlman, P
Keck, F
Keihanen, E
King, M
Kisner, TS
Kletzkine, P
Kneissl, R
Knoche, J
Knox, L
Koch, T
Krassenburg, M
Kurki-Suonio, H
Lahteenmaki, A
Lagache, G
Lagorio, E
Lami, P
Lande, J
Lange, A
Langlet, F
Lapini, R
Lapolla, M
Lasenby, A
Le Jeune, M
Leahy, JP
Lefebvre, M
Legrand, F
Le Meur, G
Leonardi, R
Leriche, B
Leroy, C
Leutenegger, P
Levin, SM
Lilje, PB
Lindensmith, C
Linden-Vornle, M
Loc, A
Longval, Y
Lubin, PM
Luchik, T
Luthold, I
Macias-Perez, JF
Maciaszek, T
MacTavish, C
Madden, S
Maffei, B
Magneville, C
Maino, D
Mambretti, A
Mansoux, B
Marchioro, D
Maris, M
Marliani, F
Marrucho, JC
Marti-Canales, J
Martinez-Gonzalez, E
Martin-Polegre, A
Martin, P
Marty, C
Marty, W
Masi, S
Massardi, M
Matarrese, S
Matthai, F
Mazzotta, P
McDonald, A
McGrath, P
Mediavilla, A
Meinhold, R
Melin, JB
Melot, F
Mendes, L
Mennella, A
Mervier, C
Meslier, L
Miccolis, M
Miville-Deschenes, MA
Moneti, A
Montet, D
Montier, L
Mora, J
Morgante, G
Morigi, G
Morinaud, G
Morisset, N
Mortlock, D
Mottet, S
Mulder, J
Munshi, D
Murphy, A
Murphy, P
Musi, P
Narbonne, J
Naselsky, P
Nash, A
Nati, F
Natoli, P
Netterfield, B
Newell, J
Nexon, M
Nicolas, C
Nielsen, PH
Ninane, N
Noviello, F
Novikov, D
Novikov, I
O'Dwyer, IJ
Oldeman, P
Olivier, P
Ouchet, L
Oxborrow, CA
Perez-Cuevas, L
Pagan, L
Paine, C
Pajot, F
Paladini, R
Pancher, F
Panh, J
Parks, G
Parnaudeau, P
Partridge, B
Parvin, B
Pascual, JP
Pasian, F
Pearson, DP
Pearson, T
Pecora, M
Perdereau, O
Perotto, L
Perrotta, F
Piacentini, F
Piat, M
Pierpaoli, E
Piersanti, O
Plaige, E
Plaszczynski, S
Platania, P
Pointecouteau, E
Polenta, G
Ponthieu, N
Popa, L
Poulleau, G
Poutanen, T
Prezeau, G
Pradell, L
Prina, M
Prunet, S
Rachen, JP
Rambaud, D
Rame, F
Rasmussen, I
Rautakoski, J
Reach, WT
Rebolo, R
Reinecke, M
Reiter, J
Renault, C
Ricciardi, S
Rideau, P
Riller, T
Ristorcelli, I
Riti, JB
Rocha, G
Roche, Y
Pons, R
Rohlfs, R
Romero, D
Roose, S
Rosset, C
Rouberol, S
Rowan-Robinson, M
Rubino-Martin, JA
Rusconi, P
Rusholme, B
Salama, M
Salerno, E
Sandri, M
Santos, D
Sanz, JL
Sauter, L
Sauvage, F
Savini, G
Schmelzel, M
Schnorhk, A
Schwarz, W
Scott, D
Seiffert, MD
Shellard, P
Shih, C
Sias, M
Silk, JI
Silvestri, R
Sippel, R
Smoot, GF
Starck, JL
Stassi, P
Sternberg, J
Stivoli, F
Stolyarov, V
Stompor, R
Stringhetti, L
Strommen, D
Stute, T
Sudiwala, R
Sugimura, R
Sunyaev, R
Sygnet, JF
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Tomasi, M
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Touze, F
Tristram, M
Tuovinen, J
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van der Vlis, M
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Van-Tent, B
Varis, J
Vassallo, E
Vescovi, C
Vezzu, F
Vibert, D
Vielva, P
Vierra, J
Villa, F
Vittorio, N
Vuerli, C
Wade, LA
Walker, AR
Wandelt, BD
Watson, C
Werner, D
White, M
White, SDM
Wilkinson, A
Wilson, P
Woodcraft, A
Yoffo, B
Yun, M
Yurchenko, V
Yvon, D
Zhang, B
Zimmermann, O
Zonca, A
Zorita, D
AF Tauber, J. A.
Mandolesi, N.
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Bersanelli, M.
Bouchet, F. R.
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Charra, J.
Crone, G.
Dodsworth, J.
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Gispert, R.
Guyot, G.
Gregorio, A.
Juillet, J. J.
Lamarre, J. -M.
Laureijs, R. J.
Lawrence, C. R.
Norgaard-Nielsen, H. U.
Passvogel, T.
Reix, J. M.
Texier, D.
Vibert, L.
Zacchei, A.
Ade, P. A. R.
Aghanim, N.
Aja, B.
Alippi, E.
Aloy, L.
Armand, P.
Arnaud, M.
Arondel, A.
Arreola-Villanueva, A.
Artal, E.
Artina, E.
Arts, A.
Ashdown, M.
Aumont, J.
Azzaro, M.
Bacchetta, A.
Baccigalupi, C.
Baker, M.
Balasini, M.
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Barbier, G.
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Bartelmann, M.
Battaglia, P.
Battaner, E.
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Boschini, L.
Boulanger, F.
Bouvier, J.
Bouzit, M.
Bowman, R.
Breelle, E.
Bradshaw, T.
Braghin, M.
Bremer, M.
Brienza, D.
Broszkiewicz, D.
Burigana, C.
Burkhalter, M.
Cabella, P.
Cafferty, T.
Cairola, M.
Caminade, S.
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Cantalupo, C. M.
Cappellini, B.
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Carr, R.
Catalano, A.
Cayon, L.
Cesa, M.
Chaigneau, M.
Challinor, A.
Chamballu, A.
Chambelland, J. P.
Charra, M.
Chiang, L. -Y.
Chlewicki, G.
Christensen, P. R.
Church, S.
Ciancietta, E.
Cibrario, M.
Cizeron, R.
Clements, D.
Collaudin, B.
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Colombi, S.
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Corre, O.
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Cougrand, B.
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Couzin, P.
Crane, B.
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Crook, M.
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Cuttaia, F.
Doerl, U.
da Silva, P.
Daddato, R.
Damasio, C.
Danese, L.
d'Aquino, G.
D'Arcangelo, O.
Dassas, K.
Davies, R. D.
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de Chambure, D.
de Gasperis, G.
De la Fuente, M. L.
De Paco, P.
De Rosa, A.
De Troia, G.
De Zotti, G.
Dehamme, M.
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Desert, F. -X.
di Girolamo, G.
Dickinson, C.
Doelling, E.
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Doyle, D.
Du, S.
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Dufour, C.
Dumesnil, C.
Dupac, X.
Duret, P.
Eder, C.
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Ensslin, T. A.
Eng, P.
English, K.
Eriksen, H. K.
Estaria, P.
Falvella, M. C.
Ferrari, F.
Finelli, F.
Fishman, A.
Fogliani, S.
Foley, S.
Fonseca, A.
Forma, G.
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Fosalba, P.
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Gorski, K. M.
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TI Planck pre-launch status: The Planck mission
SO ASTRONOMY & ASTROPHYSICS
LA English
DT Article
DE cosmic microwave background; space vehicles: instruments;
instrumentation: detectors; instrumentation: polarimeters;
submillimeter: general; radio continuum: general
ID HIGH-FREQUENCY INSTRUMENT; MICROWAVE BACKGROUND ANISOTROPY; CMB
EXPERIMENTS; CALIBRATION; POLARIZATION; SPACE; HFI; PERFORMANCE; DESIGN;
SYSTEM
AB The European Space Agency's Planck satellite, launched on 14 May 2009, is the third-generation space experiment in the field of cosmic microwave background (CMB) research. It will image the anisotropies of the CMB over the whole sky, with unprecedented sensitivity (Delta T/T similar to 2 x 10(-6)) and angular resolution (similar to 5 arcmin). Planck will provide a major source of information relevant to many fundamental cosmological problems and will test current theories of the early evolution of the Universe and the origin of structure. It will also address a wide range of areas of astrophysical research related to the Milky Way as well as external galaxies and clusters of galaxies. The ability of Planck to measure polarization across a wide frequency range (30-350 GHz), with high precision and accuracy, and over the whole sky, will provide unique insight, not only into specific cosmological questions, but also into the properties of the interstellar medium. This paper is part of a series which describes the technical capabilities of the Planck scientific payload. It is based on the knowledge gathered during the on-ground calibration campaigns of the major subsystems, principally its telescope and its two scientific instruments, and of tests at fully integrated satellite level. It represents the best estimate before launch of the technical performance that the satellite and its payload will achieve in flight. In this paper, we summarise the main elements of the payload performance, which is described in detail in the accompanying papers. In addition, we describe the satellite performance elements which are most relevant for science, and provide an overview of the plans for scientific operations and data analysis.
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[Polenta, G.] ESRIN, Agenzia Spaziale Italiana, Sci Data Ctr, Frascati, Italy.
[Falvella, M. C.; Tommasi, E.] Agenzia Spaziale Italiana, Rome, Italy.
[Sippel, R.; Stute, T.] Astrium GmbH, Friedrichshafen, Germany.
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[Lawrence, C. R.; Arreola-Villanueva, A.; Bhandari, P.; Bhatia, R.; Bock, J. J.; Borders, J.; Bowman, R.; Cafferty, T.; Crill, B.; Crumb, D.; English, K.; Fishman, A.; Fonseca, A.; Frerking, M.; Gorski, K. M.; Gaier, T. C.; Hardy, J.; Hollert, D.; Holmes, W.; Huey, G.; Israelsson, U.; Jewell, J.; Karlman, P.; King, M.; Koch, T.; Lange, A.; Levin, S. M.; Lindensmith, C.; Loc, A.; Luchik, T.; McGrath, P.; Mora, J.; Mulder, J.; Murphy, P.; Nash, A.; Newell, J.; O'Dwyer, I. J.; Paine, C.; Parks, G.; Parvin, B.; Pearson, D. P.; Pearson, T.; Prezeau, G.; Prina, M.; Reiter, J.; Rocha, G.; Romero, D.; Salama, M.; Schmelzel, M.; Schwarz, W.; Seiffert, M. D.; Shih, C.; Strommen, D.; Sugimura, R.; Tallon, J.; Tillis, J.; Vierra, J.; Wade, L. A.; Wilson, P.; Yun, M.; Zhang, B.] CALTECH, Jet Prop Lab, Pasadena, CA USA.
[Davies, R. D.; Davis, R. J.; Dickinson, C.; Jaffe, T. R.; Leahy, J. P.; Maffei, B.; Wilkinson, A.] Univ Manchester, Sch Phys & Astron, Jodrell Bank Ctr Astrophys, Manchester, Lancs, England.
[Beney, J. -L.; Cizeron, R.; Couchot, F.; Dehamme, M.; Du, S.; Eder, C.; Haissinski, J.; Henrot-Versille, S.; Heurtel, A.; Le Meur, G.; Mansoux, B.; Marrucho, J. -C.; Perdereau, O.; Plaige, E.; Plaszczynski, S.; Rosset, C.; Taurigna, M.; Touze, F.; Tristram, M.] Univ Paris 11, CNRS, IN2P3, Accelerateur Lineaire Lab, F-91405 Orsay, France.
[Barbier, G.; Benoit, A.; Bouvier, J.; Desert, F. -X.; Lagorio, E.; Pancher, F.; Vescovi, C.; Vezzu, F.; Zimmermann, O.] CNRS, UMR 5571, Lab Astrophys Grenoble, Grenoble, France.
[Cantalupo, C. M.; Kisner, T. S.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Lamarre, J. -M.; Coulais, A.] CNRS, LERMA, Observ Paris, Paris, France.
[Banday, A. J.; Bartelmann, M.; Doerl, U.; Dolag, K.; Ensslin, T. A.; Hell, R.; Hernandez-Monteagudo, C.; Hovest, W.; Kneissl, R.; Knoche, J.; Matthai, F.; Rachen, J. P.; Reinecke, M.; Riller, T.; Sunyaev, R.; White, S. D. M.] Max Planck Inst Astrophys, D-85741 Garching, Germany.
[Lahteenmaki, A.; McDonald, A.; Poutanen, T.] Aalto Univ, Metsahovi Radio Observ, Kylmala, Finland.
[Tuovinen, J.; Varis, J.] VTT Informat Technol, MilliLab, Espoo, Finland.
[Murphy, A.; Yurchenko, V.] Natl Univ Ireland, Dept Expt Phys, Dublin, Ireland.
[Christensen, P. R.; Naselsky, P.; Novikov, I.] Niels Bohr Inst, DK-2100 Copenhagen, Denmark.
[Juvela, M.] Univ Helsinki, Observ Tahtitorninmaki, Helsinki, Finland.
[Burkhalter, M.; Davies, W.] Oerlikon Space, Zurich, Switzerland.
[Biggi, M.; Lapini, R.] Officine Pasquali, Florence, Italy.
[Savini, G.] UCL, Opt Sci Lab, London, England.
[Hazell, A.] Estec, Res & Sci Support Dept, ESA, NL-2201 AZ Noordwijk, Netherlands.
[Bradshaw, T.; Crook, M.] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England.
[Zorita, D.] Sener Ingn Sistemas SA, C Severo Ochoa, Tres Cantos, Spain.
[Ricciardi, S.; Stivoli, F.] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
[Paladini, R.] Spitzer Sci Ctr, Pasadena, CA USA.
[De Paco, P.] Univ Autonoma Barcelona, Telecommun & Syst Engn Dept, E-08193 Barcelona, Spain.
[Banos, T.; Juillet, J. J.; Reix, J. M.; Armand, P.; Chambelland, J. P.; Collaudin, B.; Corre, O.; Couzin, P.; Dubruel, D.; Forma, G.; Gavila, E.; Guichon, D.; Martin, P.; Montet, D.; Ouchet, L.; Rideau, P.; Riti, J. B.; Roche, Y.; Sauvage, F.] Thales Alenia Space France, Cannes La Bocca, France.
[Bacchetta, A.; Cairola, M.; Cesa, M.; Chlewicki, G.; Ciancietta, E.; Cibrario, M.; Musi, P.; Rame, F.; Sias, M.] Thales Alenia Space Italia, Turin, Italy.
[Alippi, E.; Artina, E.; Balasini, M.; Battaglia, P.; Boschini, L.; Colombo, F.; Ferrari, F.; Lapolla, M.; Leutenegger, P.; Mambretti, A.; Marchioro, D.; Miccolis, M.; Pagan, L.; Pecora, M.; Rusconi, P.; Silvestri, R.; Taddei, E.] Thales Alenia Space Italia, Milan, Italy.
[Nielsen, P. H.] TICRA, Copenhagen, Denmark.
[Linden-Vornle, M.] Tycho Brahe Planetarium, Copenhagen, Denmark.
[Fosalba, P.] Univ Barcelona, ICE CSIC, Cerdanyola Del Valles, Barcelona, Spain.
[Borrill, J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Computat Res Dept, Berkeley, CA 94720 USA.
[Ashdown, M.; Hills, R.; Hobson, M.; Lasenby, A.; Shellard, P.] Univ Cambridge, Cavendish Lab, Astrophys Grp, Cambridge CB3 0HE, England.
[Efstathiou, G.; Challinor, A.; Harrison, D.; Mortlock, D.; Munshi, D.; Stolyarov, V.; Van Leeuwen, F.] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England.
[Battaner, E.] Univ Granada, Fac Ciencias, Dept Fis Teor Cosmos, Granada, Spain.
[Huffenberger, K. M.] Univ Miami, Coral Gables, FL 33124 USA.
[Gregorio, A.; Bonis, J.] Univ Trieste, Dept Phys, Trieste, Italy.
[Hughes, N.] Ylinen Elect Ltd, Kauniainen, Finland.
[Bartelmann, M.] Univ Heidelberg, Inst Theoret Astrophys, Zentrum Astronom, D-6900 Heidelberg, Germany.
[Macias-Perez, J. F.; Melot, F.; Perotto, L.; Renault, C.; Santos, D.; Stassi, P.] Univ Grenoble 1, IN2P3, CNRS, Inst Natl Polytech Grenoble,LPSC, F-38026 Grenoble, France.
RP Tauber, JA (reprint author), ESTEC, European Space Agcy, Div Astrophys, Keplerlaan 1, NL-2201 AZ Noordwijk, Netherlands.
EM jtauber@rssd.esa.int
RI Butler, Reginald/N-4647-2015; Collaudin, Bernard/H-7149-2015; Fosalba
Vela, Pablo/I-5515-2016; Aja, Beatriz/H-5573-2015; Nati,
Federico/I-4469-2016; popa, lucia/B-4718-2012; Piacentini,
Francesco/E-7234-2010; Novikov, Dmitry/P-1807-2015; Stolyarov,
Vladislav/C-5656-2017; Mazzotta, Pasquale/B-1225-2016; Herranz,
Diego/K-9143-2014; Battaner, Eduardo/P-7019-2014; Barreiro, Rita
Belen/N-5442-2014; Yvon, Dominique/D-2280-2015; Martinez-Gonzalez,
Enrique/E-9534-2015; de la Fuente, Luisa/J-5142-2012; Artal,
Eduardo/H-5546-2015; White, Martin/I-3880-2015; Pearson,
Timothy/N-2376-2015; Gruppuso, Alessandro/N-5592-2015; Kurki-Suonio,
Hannu/B-8502-2016; Tomasi, Maurizio/I-1234-2016; van Leeuwen,
Floor/D-4586-2011; Starck, Jean-Luc/D-9467-2011; Juvela,
Mika/H-6131-2011; Lilje, Per/A-2699-2012; Salerno, Emanuele/A-2137-2010;
de Gasperis, Giancarlo/C-8534-2012; Gregorio, Anna/J-1632-2012; Pradell,
Lluis/F-8150-2013; Bartelmann, Matthias/A-5336-2014; Bouchet,
Francois/B-5202-2014; Lahteenmaki, Anne/L-5987-2013; Vielva,
Patricio/F-6745-2014; Pascual, Juan Pablo/K-5066-2014; Toffolatti,
Luigi/K-5070-2014
OI Stringhetti, Luca/0000-0002-3961-9068; Pasian,
Fabio/0000-0002-4869-3227; WANDELT, Benjamin/0000-0002-5854-8269;
Finelli, Fabio/0000-0002-6694-3269; Gregorio, Anna/0000-0003-4028-8785;
Butler, Reginald/0000-0003-4366-5996; Sandri, Maura/0000-0003-4806-5375;
Cuttaia, Francesco/0000-0001-6608-5017; Burigana,
Carlo/0000-0002-3005-5796; Frailis, Marco/0000-0002-7400-2135;
Huffenberger, Kevin/0000-0001-7109-0099; Hivon,
Eric/0000-0003-1880-2733; Lilje, Per/0000-0003-4324-7794; Bowman,
Robert/0000-0002-2114-1713; Savini, Giorgio/0000-0003-4449-9416;
Pierpaoli, Elena/0000-0002-7957-8993; Galeotta,
Samuele/0000-0002-3748-5115; TERENZI, LUCA/0000-0001-9915-6379; Reach,
William/0000-0001-8362-4094; Zacchei, Andrea/0000-0003-0396-1192; de
Paco, Pedro/0000-0002-7628-7189; Bouchet, Francois/0000-0002-8051-2924;
Collaudin, Bernard/0000-0003-0114-3014; Ricciardi,
Sara/0000-0002-3807-4043; Villa, Fabrizio/0000-0003-1798-861X; silk,
joe/0000-0002-1566-8148; Fonseca, Ana/0000-0001-9900-7015; Scott,
Douglas/0000-0002-6878-9840; Masi, Silvia/0000-0001-5105-1439; de
Bernardis, Paolo/0000-0001-6547-6446; Vuerli,
Claudio/0000-0002-9640-8785; Forni, Olivier/0000-0001-6772-9689;
Morgante, Gianluca/0000-0001-9234-7412; Maris,
Michele/0000-0001-9442-2754; Franceschi, Enrico/0000-0002-0585-6591;
Valenziano, Luca/0000-0002-1170-0104; Aja, Beatriz/0000-0002-4229-2334;
Nati, Federico/0000-0002-8307-5088; Piacentini,
Francesco/0000-0002-5444-9327; Stolyarov, Vladislav/0000-0001-8151-828X;
Mazzotta, Pasquale/0000-0002-5411-1748; Rubino-Martin, Jose
Alberto/0000-0001-5289-3021; Polenta, Gianluca/0000-0003-4067-9196;
Herranz, Diego/0000-0003-4540-1417; Barreiro, Rita
Belen/0000-0002-6139-4272; Martinez-Gonzalez,
Enrique/0000-0002-0179-8590; de la Fuente, Luisa/0000-0003-1403-1660;
Artal, Eduardo/0000-0002-2569-1894; White, Martin/0000-0001-9912-5070;
Pearson, Timothy/0000-0001-5213-6231; Gruppuso,
Alessandro/0000-0001-9272-5292; Kurki-Suonio, Hannu/0000-0002-4618-3063;
Tomasi, Maurizio/0000-0002-1448-6131; Starck,
Jean-Luc/0000-0003-2177-7794; Juvela, Mika/0000-0002-5809-4834; Salerno,
Emanuele/0000-0002-3433-3634; de Gasperis,
Giancarlo/0000-0003-2899-2171; Pradell, Lluis/0000-0003-4026-226X;
Vielva, Patricio/0000-0003-0051-272X; Pascual, Juan
Pablo/0000-0003-2123-0502; Toffolatti, Luigi/0000-0003-2645-7386
FU NASA; Danish National Research Council; European Space Agency - ESA
FX Planck is too large a project to allow full acknowledgement of all
contributions by individuals, institutions, industries, and funding
agencies. The main entities involved in the mission are as follows. The
European Space Agency (ESA) manages the project and funds the
development of the satellite, its launch, and operations. ESA's prime
industrial contractor for Planck is Thales Alenia Space (Cannes,
France). Industry from all over Europe has contributed to the
development of Planck. Specially notable contributions to the
development are due to Thales Alenia Spazio (Italy) for the Service
Module, Astrium (Friedrichshafen, Germany) for the Planck reflectors,
and Oerlikon Space (Zurich, Switzerland) for the payload structures.
Much of the most challenging cryogenic and optical testing has been
carried out at the Centre Spatial de Liege in Belgium and on the
premises of Thales Alenia Space in Cannes. Two Consortia, comprising
around 50 scientific institutes within Europe and the US, and funded by
agencies from the participating countries, have developed the scientific
instruments LFI and HFI, and delivered them to ESA (see also Appendix
A). The Consortia are also responsible for scientific operation of their
respective instruments and processing the acquired data. The Consortia
are led by the Principal Investigators: J.-L. Puget in France of HFI
(funded principally via CNES) and N. Mandolesi in Italy of LFI (funded
principally via ASI). NASA has funded the US Planck Project, based at
JPL and involving scientists at many US institutions, which has
contributed very significantly to the efforts of these two Consortia. A
Consortium of Danish institutes (DK-Planck), funded by the Danish
National Research Council, has participated with ESA in a joint
development of the two reflectors for the Planck telescope. The author
list for this paper has been selected by the Planck Science Team, and is
composed of individuals from all of the above entities who have made
multi-year contributions to the development of the mission. It does not
pretend to be inclusive of all contributions.; Planck
(http://www.esa.int/Planck) is a project of the European Space Agency -
ESA - with instruments provided by two scientific Consortia funded by
ESA member states (in particular the lead countries: France and Italy)
with contributions from NASA (USA), and telescope reflectors provided in
a collaboration between ESA and a scientific Consortium led and funded
by Denmark.
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PD SEP-OCT
PY 2010
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PG 22
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 665VQ
UT WOS:000283064200002
ER
PT J
AU Basu, K
Zhang, YY
Sommer, MW
Bender, AN
Bertoldi, F
Dobbs, M
Eckmiller, H
Halverson, NW
Holzapfel, WL
Horellou, C
Jaritz, V
Johansson, D
Johnson, B
Kennedy, J
Kneissl, R
Lanting, T
Lee, AT
Mehl, J
Menten, KM
Navarrete, FP
Pacaud, F
Reichardt, CL
Reiprich, TH
Richards, PL
Schwan, D
Westbrook, B
AF Basu, K.
Zhang, Y. -Y.
Sommer, M. W.
Bender, A. N.
Bertoldi, F.
Dobbs, M.
Eckmiller, H.
Halverson, N. W.
Holzapfel, W. L.
Horellou, C.
Jaritz, V.
Johansson, D.
Johnson, B.
Kennedy, J.
Kneissl, R.
Lanting, T.
Lee, A. T.
Mehl, J.
Menten, K. M.
Navarrete, F. P.
Pacaud, F.
Reichardt, C. L.
Reiprich, T. H.
Richards, P. L.
Schwan, D.
Westbrook, B.
TI Non-parametric modeling of the intra-cluster gas using APEX-SZ bolometer
imaging data
SO ASTRONOMY & ASTROPHYSICS
LA English
DT Article
DE galaxies: clusters: individual: Abell 2204; cosmology: observations;
cosmic microwave background; intergalactic medium; X-rays: galaxies:
clusters
ID X-RAY-CLUSTERS; ZELDOVICH EFFECT OBSERVATIONS; MASS-TEMPERATURE
RELATION; RELAXED GALAXY CLUSTERS; SUNYAEV-ZELDOVICH; INTRACLUSTER
MEDIUM; XMM-NEWTON; 3-DIMENSIONAL STRUCTURE; ENTROPY PROFILES; HUBBLE
CONSTANT
AB Aims. We aim to demonstrate the usability of mm-wavelength imaging data obtained from the APEX-SZ bolometer array to derive the radial temperature profile of the hot intra-cluster gas out to radius r(500) and beyond. The goal is to study the physical properties of the intra-cluster gas by using a non-parametric de-projection method that is, aside from the assumption of spherical symmetry, free from modeling bias.
Methods. We use publicly available X-ray spectroscopic-imaging data in the 0.7-2 keV energy band from the XMM-Newton observatory and our Sunyaev-Zel'dovich Effect (SZE) imaging data from the APEX-SZ experiment at 150 GHz to de-project the density and temperature profiles for a well-studied relaxed cluster, Abell 2204. We derive the gas density, temperature and entropy profiles assuming spherical symmetry, and obtain the total mass profile under the assumption of hydrostatic equilibrium. For comparison with X-ray spectroscopic temperature models, a re-analysis of recent Chandra observation is done with the latest calibration updates. We compare the results with that from an unrelaxed cluster, Abell 2163, to illustrate some differences between relaxed and merging systems.
Results. Using the non-parametric modeling, we demonstrate a decrease of gas temperature in the cluster outskirts, and also measure gas entropy profiles, both of which are done for the first time independently of X-ray spectroscopy using the SZE and X-ray imaging data. The gas entropy measurement in the central 100 kpc shows the usability of APEX-SZ data for inferring cluster dynamical states with this method. The contribution of the SZE systematic uncertainties in measuring T(e) at large radii is shown to be small compared to XMM-Newton and Chandra systematic spectroscopic errors. The total mass profile obtained using the hydrostatic equilibrium assumption is in agreement with the published X-ray and weak lensing results; the upper limit on M(200) derived from the non-parametric method is consistent with the NFW model prediction from weak lensing analysis.
C1 [Basu, K.; Sommer, M. W.; Menten, K. M.; Navarrete, F. P.] Max Planck Inst Radio Astron, D-53121 Bonn, Germany.
[Basu, K.; Zhang, Y. -Y.; Sommer, M. W.; Bertoldi, F.; Eckmiller, H.; Jaritz, V.; Pacaud, F.; Reiprich, T. H.] Univ Bonn, Argelander Inst Astron, D-53121 Bonn, Germany.
[Bender, A. N.; Halverson, N. W.] Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA.
[Dobbs, M.; Kennedy, J.] McGill Univ, Dept Phys, Montreal, PQ H2T 2Y8, Canada.
[Holzapfel, W. L.; Johnson, B.; Lee, A. T.; Reichardt, C. L.; Richards, P. L.; Schwan, D.; Westbrook, B.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Horellou, C.; Johansson, D.] Chalmers, Onsala Space Observ, S-43992 Onsala, Sweden.
[Kneissl, R.] Joint ALMA Observ, Santiago, Chile.
[Lanting, T.] Cardiff Univ, Cardiff CF24 3YB, S Glam, Wales.
[Lee, A. T.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Mehl, J.] Univ Chicago, Chicago, IL 60637 USA.
RP Basu, K (reprint author), Max Planck Inst Radio Astron, D-53121 Bonn, Germany.
EM kbasu@mpifr-bonn.mpg.de
RI Holzapfel, William/I-4836-2015;
OI Reichardt, Christian/0000-0003-2226-9169
FU DFG [1177, RE 1462/2, TR33]; Transregio Programme [TR33]; National
Science Foundation [AST-0138348]; ESA Member States; ESA Member States
and the USA (NASA); Bundesministerium fur Wirtschaft und
Technologie/Deutsches Zentrum fur Luft- und Raumfahrt (BMWI/DLR) [FKZ 50
OX 0001]; Max-Planck Society; BMBF/DLR [50OR0601]; Max Planck Research
School (IMPRS) for Radio and Infrared Astronomy at the Universities of
Bonn and Cologne
FX We appreciate the comments from the anonymous referee which has improved
the discussion on the future applicability of this method. We thank the
APEX staff for their assistance during APEX-SZ observations. This work
has been partially supported by the DFG Priority Programme 1177 and
Transregio Programme TR33. APEX is a collaboration between the
Max-Planck-Institut fur Radioastronomie, the European Southern
Observatory, and the Onsala Space Observatory. APEX-SZ is funded by the
National Science Foundation under Grant No. AST-0138348. The XMM-Newton
project is an ESA Science Mission with instruments and contributions
directly funded by ESA Member States and the USA (NASA). The XMM-Newton
project is supported by the Bundesministerium fur Wirtschaft und
Technologie/Deutsches Zentrum fur Luft- und Raumfahrt (BMWI/DLR, FKZ 50
OX 0001) and the Max-Planck Society. K. B. acknowledges Hans Bohringer
for discussion and reading the manuscript. Y.Y.Z. and T. H. R.
acknowledges support by the DFG through Emmy Noether Research Grant RE
1462/2 and by the BMBF/DLR grant No. 50OR0601. M.N. and F.P.N.
acknowledges support for this research through the International Max
Planck Research School (IMPRS) for Radio and Infrared Astronomy at the
Universities of Bonn and Cologne.
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JI Astron. Astrophys.
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PG 14
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 668UQ
UT WOS:000283297300029
ER
PT J
AU Jackson, AP
Calder, AC
Townsley, DM
Chamulak, DA
Brown, EF
Timmes, FX
AF Jackson, Aaron P.
Calder, Alan C.
Townsley, Dean M.
Chamulak, David A.
Brown, Edward F.
Timmes, F. X.
TI EVALUATING SYSTEMATIC DEPENDENCIES OF TYPE Ia SUPERNOVAE: THE INFLUENCE
OF DEFLAGRATION TO DETONATION DENSITY
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE hydrodynamics; nuclear reactions, nucleosynthesis, abundances;
supernovae: general; white dwarfs
ID GRAVITATIONALLY CONFINED DETONATION; WHITE-DWARF SUPERNOVAE; LIGHT
CURVES; THERMONUCLEAR SUPERNOVAE; DELAYED DETONATION; EXPLOSION MODELS;
TURBULENT FLAMES; LUMINOSITY; METALLICITY; SIMULATIONS
AB We explore the effects of the deflagration to detonation transition (DDT) density on the production of (56)Ni in thermonuclear supernova (SN) explosions (Type la supernovae). Within the DDT paradigm, the transition density sets the amount of expansion during the deflagration phase of the explosion and therefore the amount of nuclear statistical equilibrium (NSE) material produced. We employ a theoretical framework for a well-controlled statistical study of two-dimensional simulations of thermonuclear SNe with randomized initial conditions that can, with a particular choice of transition density, produce a similar average and range of 56Ni masses to those inferred from observations. Within this framework, we utilize a more realistic "simmered" white dwarf progenitor model with a flame model and energetics scheme to calculate the amount of (56)Ni and NSE material synthesized for a suite of simulated explosions in which the transition density is varied in the range (1-3) x 10(7) g cm(-3). We find a quadratic dependence of the NSE yield on the log of the transition density, which is determined by the competition between plume rise and stellar expansion. By considering the effect of metallicity on the transition density, we find the NSE yield decreases by 0.055 +/- 0.004 M(circle dot) for a 1 Z(circle dot) increase in metallicity evaluated about solar metallicity. For the same change in metallicity, this result translates to a 0.067 +/- 0.004 M(circle dot) decrease in the (56)Ni yield, slightly stronger than that due to the variation in electron fraction from the initial composition. Observations testing the dependence of the yield on metallicity remain somewhat ambiguous, but the dependence we find is comparable to that inferred from some studies.
C1 [Jackson, Aaron P.; Calder, Alan C.] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA.
[Calder, Alan C.] SUNY Stony Brook, New York Ctr Computat Sci, Stony Brook, NY 11794 USA.
[Townsley, Dean M.] Univ Alabama, Dept Phys & Astron, Tuscaloosa, AL 35487 USA.
[Chamulak, David A.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Chamulak, David A.; Brown, Edward F.; Timmes, F. X.] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA.
[Brown, Edward F.] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA.
[Timmes, F. X.] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA.
RP Jackson, AP (reprint author), SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA.
RI Calder, Alan/E-5348-2011; Brown, Edward/F-1721-2011;
OI Brown, Edward/0000-0003-3806-5339
FU Department of Energy [DE-FG02-07ER41516, DE-FG02-08ER41570,
DE-FG02-08ER41565, DE-FG02-87ER40317]; NASA [NNX09AD19G]; University of
Arizona; NSF [PHY05-51164]; ASC/Alliances Center for Astrophysical
Thermonuclear Flashes at the University of Chicago; US Department of
Energy, Office of Nuclear Physics [DE-AC02-06CH11357]; U.S. Department
of Energy [DE-AC02-98CH10886]; State of New York
FX This work was supported by the Department of Energy through grants
DE-FG02-07ER41516, DE-FG02-08ER41570, and DE-FG02-08ER41565, and by NASA
through grant NNX09AD19G. A.C.C. also acknowledges support from the
Department of Energy under grant DE-FG02-87ER40317. D.M.T. received
support from the Bart J. Bok fellowship at the University of Arizona for
part of this work. The authors acknowledge the hospitality of the Kavli
Institute for Theoretical Physics, which is supported by the NSF under
grant PHY05-51164, during the programs "Accretion and Explosion: the
Astrophysics of Degenerate Stars" and "Stellar Death and Supernovae."
The software used in this work was in part developed by the
DOE-supported ASC/Alliances Center for Astrophysical Thermonuclear
Flashes at the University of Chicago. We thank Nathan Hearn for making
his QuickFlash analysis tools publicly available at
http://quickflash.sourceforge.net. We also thank the anonymous referee
for a careful reading of the manuscript and constructive comments that
improved this work. This work was supported in part by the US Department
of Energy, Office of Nuclear Physics, under contract DE-AC02-06CH11357
and utilized resources at the New York Center for Computational Sciences
at Stony Brook University/Brookhaven National Laboratory which is
supported by the U.S. Department of Energy under Contract No.
DE-AC02-98CH10886 and by the State of New York.
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PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 1
PY 2010
VL 720
IS 1
BP 99
EP 113
DI 10.1088/0004-637X/720/1/99
PG 15
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647DJ
UT WOS:000281596000009
ER
PT J
AU Leggett, SK
Saumon, D
Burningham, B
Cushing, MC
Marley, MS
Pinfield, DJ
AF Leggett, S. K.
Saumon, D.
Burningham, Ben
Cushing, Michael C.
Marley, M. S.
Pinfield, D. J.
TI PROPERTIES OF THE T8.5 DWARF WOLF 940 B
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE brown dwarfs; infrared: stars; stars: fundamental parameters; stars:
individual (Wolf 940B)
ID SPITZER-SPACE-TELESCOPE; STAR SPECTROSCOPIC SURVEY; EXOPLANET HOST STAR;
DIGITAL SKY SURVEY; COOL BROWN DWARF; MID-T DWARFS;
CHEMICAL-EQUILIBRIUM; PHYSICAL-PROPERTIES; BINARY-SYSTEM; GLIESE 570D
AB We present 7.5-14.2 mu m low-resolution spectroscopy, obtained with the Spitzer Infrared Spectrograph, of the T8.5 dwarf Wolf 940 B, which is a companion to an M4 dwarf with a projected separation of 400 AU. We combine these data with previously published near-infrared spectroscopy and mid-infrared photometry to produce the spectral energy distribution for the very low temperature T dwarf. We use atmospheric models to derive the bolometric correction and obtain a luminosity of log L/L(circle dot) = -6.01 +/- 0.05 (the observed spectra make up 47% of the total flux). Evolutionary models are used with the luminosity to constrain the values of effective temperature (T(eff)) and surface gravity and hence mass and age for the T dwarf. We ensure that the spectral models used to determine the bolometric correction have T(eff) and gravity values consistent with the luminosity-implied values. We further restrict the allowed range of T(eff) and gravity using age constraints implied by the M dwarf primary and refine the physical properties of the T dwarf by comparison of the observed and modeled spectroscopy and photometry. This comparison indicates that Wolf 940 B has a metallicity within similar to 0.2 dex of solar, as more extreme values give poor fits to the data-lower metallicity produces a poor fit at lambda > 2 mu m, while higher metallicity produces a poor fit at lambda < 2 mu m. This is consistent with the independently derived value of [m/H] = +0.24 +/- 0.09 for the primary star, using the Johnson & Apps M(K): V - K relationship. We find that the T dwarf atmosphere is undergoing vigorous mixing, with an eddy diffusion coefficient K(zz) of 10(4) to 10(6) cm(2) s(-1). We derive an effective temperature of 585 K to 625 K, and surface gravity log g = 4.83 to 5.22 (cm s(-2)), for an age range of 3 Gyr to 10 Gyr, as implied by the kinematic and Ha properties of the M dwarf primary. Gravity and temperature are correlated such that the lower gravity corresponds to the lower temperature and younger age for the system and the higher values to the higher temperature and older age. The mass of the T dwarf is 24 M(Jupiter) to 45 M(Jupiter) for the younger to older age limit.
C1 [Leggett, S. K.] No Operat Ctr, Gemini Observ, Hilo, HI 96720 USA.
[Saumon, D.] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Burningham, Ben; Pinfield, D. J.] Univ Hertfordshire, Sci & Technol Res Inst, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England.
[Cushing, Michael C.] CALTECH, Jet Prop Lab, Dept Astrophys, Pasadena, CA 91109 USA.
[Marley, M. S.] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA.
RP Leggett, SK (reprint author), No Operat Ctr, Gemini Observ, 670 N Aohoku Pl, Hilo, HI 96720 USA.
EM sleggett@gemini.edu
RI Marley, Mark/I-4704-2013;
OI Marley, Mark/0000-0002-5251-2943; Burningham, Ben/0000-0003-4600-5627;
Leggett, Sandy/0000-0002-3681-2989
FU NASA; Gemini Observatory
FX This work is based on observations made with the Spitzer Space
Telescope, which is operated by the Jet Propulsion Laboratory,
California Institute of Technology under a contract with NASA. Support
for this work was provided by NASA through an award issued by
JPL/Caltech. Support for this work was also provided by the Spitzer
Space Telescope Theoretical Research Program, through NASA. S.K.L.'s
research is supported by the Gemini Observatory, which is operated by
the Association of Universities for Research in Astronomy, Inc., on
behalf of the international Gemini partnership of Argentina, Australia,
Brazil, Canada, Chile, the United Kingdom, and the United States of
America.
NR 55
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PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 1
PY 2010
VL 720
IS 1
BP 252
EP 258
DI 10.1088/0004-637X/720/1/252
PG 7
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647DJ
UT WOS:000281596000022
ER
PT J
AU Slane, P
Castro, D
Funk, S
Uchiyama, Y
Lemiere, A
Gelfand, JD
Lemoine-Goumard, M
AF Slane, P.
Castro, D.
Funk, S.
Uchiyama, Y.
Lemiere, A.
Gelfand, J. D.
Lemoine-Goumard, M.
TI FERMI DETECTION OF THE PULSAR WIND NEBULA HESS J1640-465
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE ISM: individual objects (HESS J1640-465, FGL J1640.8-4634, 3EG
J1639-4702, G338.3-0.0); ISM: supernova remnants; pulsars: general
ID LARGE-AREA TELESCOPE; GAMMA-RAY EMISSION; SUPERNOVA REMNANT; RX
J1713.7-3946; X-RAY; EVOLUTION; ACCELERATION; SPECTRUM; CATALOG; GALAXY
AB We present observations of HESS J1640-465 with the Fermi-Large Area Telescope. The source is detected with high confidence as an emitter of high-energy gamma-rays. The spectrum lacks any evidence for the characteristic cutoff associated with emission from pulsars, indicating that the emission arises primarily from the pulsar wind nebula (PWN). Broadband modeling implies an evolved nebula with a low magnetic field resulting in a high gamma-ray to X-ray flux ratio. The Fermi emission exceeds predictions of the broadband model, and has a steeper spectrum, possibly resulting from a distinct excess of low energy electrons similar to what is inferred for both the Vela X and Crab PWNe.
C1 [Slane, P.; Castro, D.] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
[Castro, D.] Univ Simon Bolivar, Dept Fis, Valle De Sartenejas, Venezuela.
[Funk, S.; Uchiyama, Y.] Stanford Linear Accelerator Ctr, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94025 USA.
[Lemiere, A.] CNRS, IN2P3, Inst Phys Nucl, F-91400 Orsay, France.
[Gelfand, J. D.] NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA.
[Lemoine-Goumard, M.] Univ Bordeaux, CNRS, IN2P3, Ctr Etud Nucl Bordeaux Gradignan,UMR 5797, F-33175 Gradignan, France.
RP Slane, P (reprint author), Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA.
EM slane@cfa.harvard.edu; dcastro@head.cfa.harvard.edu;
funk@slac.stanford.edu; uchiyama@slac.stanford.edu
RI Funk, Stefan/B-7629-2015; Gelfand, Joseph/F-1110-2015
OI Funk, Stefan/0000-0002-2012-0080; Gelfand, Joseph/0000-0003-4679-1058
FU NASA [NAS8-39073]; Fermi [NNX09AT68G]; NSF [AST-0702957]; INAF in Italy;
CNES in France
FX The work presented here was supported in part by NASA Contract
NAS8-39073 (P.O.S.) and Fermi Grant NNX09AT68G. J.D.G. is supported by
an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award
AST-0702957. P.O.S., S.F., and Y.U. are grateful to the KITP in Santa
Barbara, where elements of the work presented here were first discussed
during a KITP program. The authors thank Don Ellison, Luke Drury, Felix
Aharonian, and David Smith for helpful discussions during the
preparation of this paper.; The Fermi-LAT Collaboration acknowledges
support from a number of agencies and institutes for both development
and the operation of the LAT as well as scientific data analysis. These
include NASA and DOE in the United States, CEA/Irfu and IN2P3/CNRS in
France, ASI and INFN in Italy, MEXT, KEK, and JAXA in Japan, and the K.
A. Wallenberg Foundation, the Swedish Research Council and the National
Space Board in Sweden. Additional support from INAF in Italy and CNES in
France for science analysis during the operations phase is also
gratefully acknowledged.
NR 35
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PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 1
PY 2010
VL 720
IS 1
BP 266
EP 271
DI 10.1088/0004-637X/720/1/266
PG 6
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647DJ
UT WOS:000281596000024
ER
PT J
AU Mancone, CL
Gonzalez, AH
Brodwin, M
Stanford, SA
Eisenhardt, PRM
Stern, D
Jones, C
AF Mancone, Conor L.
Gonzalez, Anthony H.
Brodwin, Mark
Stanford, Spencer A.
Eisenhardt, Peter R. M.
Stern, Daniel
Jones, Christine
TI THE FORMATION OF MASSIVE CLUSTER GALAXIES
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE galaxies: clusters: general; galaxies: evolution galaxies: formation;
galaxies: luminosity function, mass function
ID IRAC SHALLOW SURVEY; STELLAR POPULATION SYNTHESIS; NEAR-INFRARED
PROPERTIES; LUMINOSITY FUNCTION; RED SEQUENCE; STAR-FORMATION;
EVOLUTION; SPITZER; 1ST; UNCERTAINTIES
AB We present composite 3.6 and 4.5 mu m luminosity functions (LFs) for cluster galaxies measured from the Spitzer Deep, Wide-Field Survey for 0.3 < z < 2. We compare the evolution of m* for these LFs to models for passively evolving stellar populations to constrain the primary epoch of star formation in massive cluster galaxies. At low redshifts (z less than or similar to 1.3), our results agree well with models with no mass assembly and passively evolving stellar populations with a luminosity-weighted mean formation redshift z(f) = 2.4 assuming a Kroupa initial mass function (IMF). We conduct a thorough investigation of systematic biases that might influence our results, and estimate systematic uncertainties of Delta z(f) = (+0.16)(-0.18) (model normalization), Delta z(f) = (+0.40)(-0.05) (a), and Delta z(f) = (+0.30)(-0.45) (choice of stellar population model). For a Salpeter-type IMF, the typical formation epoch is thus strongly constrained to be z similar to 2-3. Higher formation redshifts can only be made consistent with the data if one permits an evolving IMF that is bottom-light at high redshift, as suggested by van Dokkum. At high redshifts (z greater than or similar to 1.3), we also witness a statistically significant (>5 sigma) disagreement between the measured LF and the continuation of the passive evolution model from lower redshifts. After considering potential systematic biases that might influence our highest redshift data points, we interpret the observed deviation as potential evidence for ongoing mass assembly at this epoch.
C1 [Mancone, Conor L.; Gonzalez, Anthony H.] Univ Florida, Dept Astron, Gainesville, FL 32611 USA.
[Brodwin, Mark; Jones, Christine] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
[Stanford, Spencer A.] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA.
[Stanford, Spencer A.] Lawrence Livermore Natl Lab, Inst Geophys & Planetary Phys, Livermore, CA 94550 USA.
[Eisenhardt, Peter R. M.; Stern, Daniel] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.
RP Mancone, CL (reprint author), Univ Florida, Dept Astron, Gainesville, FL 32611 USA.
EM cmaneone@astro.ufl.edu; anthony@astro.ufl.edu
FU National Science Foundation [AST-0708490]; U.S. Department of Energy by
Lawrence Livermore National Laboratory [W-7405-Eng-48,
DE-AC52-07NA27344]; NASA
FX This paper is based upon work supported by the National Science
Foundation under grant AST-0708490. Part of this work was performed
under the auspices of the U.S. Department of Energy by Lawrence
Livermore National Laboratory in part under Contract W-7405-Eng-48 and
in part under Contract DE-AC52-07NA27344. The work of P.R.M.E. and D.S.
was carried out at the Jet Propulsion Laboratory, California Institute
of Technology, under a contract with NASA. This work is based on
observations made with the Spitzer Space Telescope, which is operated by
the Jet Propulsion Laboratory, California Institute of Technology under
a contract with NASA. Support for this work was provided by NASA through
an award issued by JPL/Caltech.
NR 40
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PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 1
PY 2010
VL 720
IS 1
BP 284
EP 298
DI 10.1088/0004-637X/720/1/284
PG 15
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647DJ
UT WOS:000281596000026
ER
PT J
AU Chatterjee, S
Ho, S
Newman, JA
Kosowsky, A
AF Chatterjee, Suchetana
Ho, Shirley
Newman, Jeffrey A.
Kosowsky, Arthur
TI TENTATIVE DETECTION OF QUASAR FEEDBACK FROM WMAP AND SDSS
CROSS-CORRELATION
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE cosmic background radiation; galaxies: active; submillimeter: general
ID SLOAN-DIGITAL-SKY; MICROWAVE BACKGROUND ANISOTROPIES; X-RAY CAVITIES;
GALAXY GROUPS; GALACTIC WINDS; AGN FEEDBACK; ZELDOVICH; CLUSTERS; PROBE;
MAPS
AB We perform a cross-correlation analysis of microwave data from the Wilkinson Microwave Anisotropy Probe and photometric quasars from the Sloan Digital Sky Survey, testing for the Sunyaev-Zeldovich (SZ) effect from quasars. A statistically significant (2.5 sigma) temperature decrement exists in the 41 GHz microwave band. A two-component fit to the cross-correlation spectrum incorporating both dust emission and SZ yields a best-fit y parameter of (7.0 +/- 3.4) x 10(-7). A similar cross-correlation analysis with the luminous red galaxy sample from Sloan gives a best-fit y parameter of (5.3 +/- 2.5) x 10(-7). We discuss the possible physical origin of these signals, which is likely a combination of SZ effects from quasars and galaxy clusters. Both the Planck Surveyor satellite and the current ground-based arcminute-resolution microwave experiments will detect this signal with a higher statistical significance.
C1 [Chatterjee, Suchetana; Newman, Jeffrey A.; Kosowsky, Arthur] Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA.
[Ho, Shirley] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA.
[Ho, Shirley] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Chatterjee, Suchetana] Yale Univ, Dept Astron, New Haven, CT 06520 USA.
RP Chatterjee, S (reprint author), Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA.
FU National Science Foundation at University of Pittsburgh [AST-0408698,
AST-0546035, AST-0807790]; Zaccheus Daniel Fellowship at University of
Pittsburgh; Alfred P. Sloan Foundation; U.S. Department of Energy;
National Aeronautics and Space Administration; Japanese Monbukagakusho;
Max Planck Society; Higher Education Funding Council for England; Andrew
Mellon Fellowship at University of Pittsburgh; National Science
Foundation; American Museum of Natural History; Astrophysical Institute
Potsdam; University of Basel; University of Cambridge; Case Western
Reserve University; University of Chicago; Drexel University; Fermilab;
Institute for Advanced Study; Japan Participation Group; Johns Hopkins
University; Joint Institute for Nuclear Astrophysics; Kavli Institute
for Particle Astrophysics and Cosmology; Korean Scientist Group;
Laboratory; Max-Planck-Institute for Astronomy (MPIA);
Max-Planck-Institute for Astrophysics (MPA); New Mexico State
University; Ohio State University; University of Pittsburgh; University
of Portsmouth; Princeton University; United States Naval Observatory;
University of Washington
FX S.C. thanks David Spergel for thoughtful suggestions throughout this
work, Neelima Sehgal and Zheng Zheng for helpful discussions, Grant
Wilson for insights about the observed spectrum, and Valery Rashkov for
providing his undergraduate thesis from Princeton University which
contains a useful derivation of the Weiner filter. S.C. also thanks the
Department of Astrophysical Sciences at Princeton University for hosting
her visits to Princeton and Adam Solomon for helping with some of the
analysis codes. We also thank the referee for providing valuable
feedback of our work which helped in significant improvement of the
draft. We acknowledge Craig Markwardt for usage of the MPFIT package,
and the Legacy Archive for Microwave Background Data Analysis (LAMBDA)
for providing the data products from the WMAP Science Team. This work
was supported at the University of Pittsburgh by the National Science
Foundation through grant AST-0408698 to the ACT project, and by grants
AST-0546035 and AST-0807790. S.C. was partly funded by the Zaccheus
Daniel Fellowship and the Andrew Mellon Fellowship at the University of
Pittsburgh. Funding for the SDSS and SDSS-II has been provided by the
Alfred P. Sloan Foundation, the Participating Institutions, the National
Science Foundation, the U.S. Department of Energy, the National
Aeronautics and Space Administration, the Japanese Monbukagakusho, the
Max Planck Society, and the Higher Education Funding Council for
England. The SDSS Web site is http://www.sdss.org/.; The SDSS is managed
by the Astrophysical Research Consortium for the Participating
Institutions. The Participating Institutions are the American Museum of
Natural History, Astrophysical Institute Potsdam, University of Basel,
University of Cambridge, Case Western Reserve University, University of
Chicago, Drexel University, Fermilab, the Institute for Advanced Study,
the Japan Participation Group, Johns Hopkins University, the Joint
Institute for Nuclear Astrophysics, the Kavli Institute for Particle
Astrophysics and Cosmology, the Korean Scientist Group, the Chinese
Academy of Sciences (LAMOST), Los Alamos National Laboratory, the
Max-Planck-Institute for Astronomy (MPIA), the Max-Planck-Institute for
Astrophysics (MPA), New Mexico State University, Ohio State University,
University of Pittsburgh, University of Portsmouth, Princeton
University, the United States Naval Observatory, and the University of
Washington.
NR 72
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PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 1
PY 2010
VL 720
IS 1
BP 299
EP 305
DI 10.1088/0004-637X/720/1/299
PG 7
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647DJ
UT WOS:000281596000027
ER
PT J
AU Nordhaus, J
Burrows, A
Almgren, A
Bell, J
AF Nordhaus, J.
Burrows, A.
Almgren, A.
Bell, J.
TI DIMENSION AS A KEY TO THE NEUTRINO MECHANISM OF CORE-COLLAPSE SUPERNOVA
EXPLOSIONS
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE hydrodynamics; neutrinos; stars: interiors; supernovae: general
ID ACCRETION-SHOCK INSTABILITY; EQUATION-OF-STATE; NUCLEAR-MATTER;
RADIATION HYDRODYNAMICS; POSTBOUNCE EVOLUTION; DRIVEN CONVECTION;
PROGENITOR STARS; MASSIVE STARS; SIMULATIONS; TRANSPORT
AB We explore the dependence on spatial dimension of the viability of the neutrino heating mechanism of core-collapse supernova explosions. We find that the tendency to explode is a monotonically increasing function of dimension, with three dimensions (3D) requiring similar to 40%-50% lower driving neutrino luminosity than one dimension and similar to 15%-25% lower driving neutrino luminosity than two dimensions (2D). Moreover, we find that the delay to explosion for a given neutrino luminosity is always shorter in 3D than 2D, sometimes by many hundreds of milliseconds. The magnitude of this dimensional effect is much larger than the purported magnitude of a variety of other effects, such as nuclear burning, inelastic scattering, or general relativity, which are sometimes invoked to bridge the gap between the current ambiguous and uncertain theoretical situation and the fact of robust supernova explosions. Since real supernovae occur in three dimensions, our finding may be an important step toward unraveling one of the most problematic puzzles in stellar astrophysics. In addition, even though in 3D, we do see pre-explosion instabilities and blast asymmetries, unlike the situation in 2D, we do not see an obvious axially symmetric dipolar shock oscillation. Rather, the free energy available to power instabilities seems to be shared by more and more degrees of freedom as the dimension increases. Hence, the strong dipolar axisymmetry seen in 2D and previously identified as a fundamental characteristic of the shock hydrodynamics may not survive in 3D as a prominent feature.
C1 [Nordhaus, J.; Burrows, A.] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA.
[Almgren, A.; Bell, J.] Lawrence Berkeley Lab, Computat Res Div, Berkeley, CA 94720 USA.
RP Nordhaus, J (reprint author), Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA.
EM nordhaus@astro.princeton.edu; burrows@astro.princeton.edu;
ASAlmgren@lbl.gov; JBBell@lbl.gov
FU DOE [DE-FG02-08ER41544]; NSF [ND201387, PHY-0822648, OCI-0905046];
Louisiana State University [44592]; SciDAC program [DE-FC02-06ER41438];
Princeton Institute for Computational Science and Engineering (PICSciE);
Princeton University Office of Information Technology; Office of Science
of the US Department of Energy [DE-AC03-76SF00098]
FX The authors acknowledge fruitful past collaborations with, conversations
with, or input from Jeremiah Murphy, Christian Ott, Louis Howell,
Rodrigo Fernandez, Manou Rantsiou, Tim Brandt, Dave Spiegel, Eli Livne,
Luc Dessart, Todd Thompson, Rolf Walder, Stan Woosley, and Thomas Janka.
They also thank Hank Childs and the VACET/VisIt Visualization team(s)
for help with graphics and with developing multidimensional analysis
tools. J.N. and A.B. are supported by the Scientific Discovery through
Advanced Computing (SciDAC) program of the DOE, under grant
DE-FG02-08ER41544, the NSF under the subaward ND201387 to the Joint
Institute for Nuclear Astrophysics (JINA, NSF PHY-0822648), and the NSF
PetaApps program, under award OCI-0905046 via a subaward 44592 from
Louisiana State University to Princeton University. Work at LBNL was
supported in part by the SciDAC program under contract
DE-FC02-06ER41438. The authors thank the members of the Center for
Computational Sciences and Engineering (CCSE) at LBNL for their
invaluable support for CASTRO. J.N. and A.B. employed computational
resources provided by the TIGRESS high performance computer center at
Princeton University, which is jointly supported by the Princeton
Institute for Computational Science and Engineering (PICSciE) and the
Princeton University Office of Information Technology; by the National
Energy Research Scientific Computing Center (NERSC), which is supported
by the Office of Science of the US Department of Energy under contract
DE-AC03-76SF00098; on the Kraken and Ranger supercomputers, hosted at
NICS and TACC and provided by the
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PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
EI 1538-4357
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 1
PY 2010
VL 720
IS 1
BP 694
EP 703
DI 10.1088/0004-637X/720/1/694
PG 10
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647DJ
UT WOS:000281596000060
ER
PT J
AU McClelland, CM
Garnavich, PM
Galbany, L
Miquel, R
Foley, RJ
Filippenko, AV
Bassett, B
Wheeler, JC
Goobar, A
Jha, SW
Sako, M
Frieman, JA
Sollerman, J
Vinko, J
Schneider, DP
AF McClelland, Colin M.
Garnavich, Peter M.
Galbany, Lluis
Miquel, Ramon
Foley, Ryan J.
Filippenko, Alexei V.
Bassett, Bruce
Wheeler, J. Craig
Goobar, Ariel
Jha, Saurabh W.
Sako, Masao
Frieman, Joshua A.
Sollerman, Jesper
Vinko, Jozsef
Schneider, Donald P.
TI THE SUBLUMINOUS SUPERNOVA 2007qd: A MISSING LINK IN A FAMILY OF
LOW-LUMINOSITY TYPE Ia SUPERNOVAE
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE galaxies: individual (SDSS J020932.73-005959.8); supernovae: general;
supernovae: individual (SN 2007qd, SN 2008ha, SN 2002cx, SN 2005hk)
ID DIGITAL SKY SURVEY; LIGHT-CURVE SHAPES; HUBBLE-SPACE-TELESCOPE; SN
2008HA; MODELS; CONSTANT; CONSTRAINTS; PROGENITOR; DISTANCE; SPECTRA
AB We present multi-band photometry and multi-epoch spectroscopy of the peculiar Type Ia supernova (SN la) 2007qd, discovered by the SDSS-II Supernova Survey. It possesses physical properties intermediate to those of the peculiar SN 2002cx and the extremely low-luminosity SN 2008ha. Optical photometry indicates that it had an extraordinarily fast rise time of less than or similar to 10 days and a peak absolute B magnitude of -15.4 +/- 0.2 at most, making it one of the most subluminous SN la ever observed. Follow-up spectroscopy of SN 2007qd near maximum brightness unambiguously shows the presence of intermediate-mass elements which are likely caused by carbon/oxygen nuclear burning. Near maximum brightness, SN 2007qd had a photospheric velocity of only 2800 km s(-1), similar to that of SN 2008ha but about 4000 and 7000 km s(-1) less than that of SN 2002cx and normal SN la, respectively. We show that the peak luminosities of SN 2002cx like objects are highly correlated with both their light-curve stretch and photospheric velocities. Its strong apparent connection to other SN 2002cx like events suggests that SN 2007qd is also a pure deflagration of a white dwarf, although other mechanisms cannot be ruled out. It may be a critical link between SN 2008ha and the other members of the SN 2002cx like class of objects.
C1 [McClelland, Colin M.; Garnavich, Peter M.] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA.
[Galbany, Lluis; Miquel, Ramon] Univ Autonoma Barcelona, Inst Fis Altes Energies, E-08193 Barcelona, Spain.
[Miquel, Ramon] Inst Catalana Recerca & Estudis Avancats, E-08010 Barcelona, Spain.
[Foley, Ryan J.] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA.
[Filippenko, Alexei V.] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA.
[Bassett, Bruce] Univ Cape Town, Dept Math & Appl Math, ZA-7701 Rondebosch, South Africa.
[Wheeler, J. Craig] Univ Texas Austin, Dept Astron, McDonald Observ, Austin, TX 78712 USA.
[Goobar, Ariel] Stockholm Univ, Dept Phys, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden.
[Goobar, Ariel] Stockholm Univ, Dept Phys, Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden.
[Jha, Saurabh W.] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA.
[Sako, Masao] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA.
[Frieman, Joshua A.] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA.
[Frieman, Joshua A.] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA.
[Frieman, Joshua A.] Fermilab Natl Accelerator Lab, Ctr Particle Astrophys, Batavia, IL 60510 USA.
[Sollerman, Jesper] Univ Copenhagen, Dark Cosmol Ctr, Niels Bohr Inst, DK-2100 Copenhagen, Denmark.
[Sollerman, Jesper] Stockholm Univ, Dept Astron, Oskar Klein Ctr, S-10691 Stockholm, Sweden.
[Vinko, Jozsef] Univ Szeged, Dept Opt & Quantum Elect, Szeged, Hungary.
[Schneider, Donald P.] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA.
RP McClelland, CM (reprint author), Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA.
RI Galbany, Lluis/A-8963-2017;
OI Galbany, Lluis/0000-0002-1296-6887; Bassett, Bruce/0000-0001-7700-1069;
Sollerman, Jesper/0000-0003-1546-6615; Vinko,
Jozsef/0000-0001-8764-7832; Miquel, Ramon/0000-0002-6610-4836
FU Alfred P. Sloan Foundation; National Science Foundation (NSF)
[AST-0908886, AST-0847157]; U.S. Department of Energy (DOE); National
Aeronautics and Space Administration (NASA); Japanese Monbukagakusho;
Max Planck Society; Higher Education Funding Council for England;
American Museum of Natural History; Astrophysical Institute Potsdam;
University of Basel; University of Cambridge; Case Western Reserve
University; University of Chicago; Drexel University; Fermilab;
Institute for Advanced Study; Japan Participation Group; Johns Hopkins
University; Joint Institute for Nuclear Astrophysics; Kavli Institute
for Particle Astrophysics and Cosmology; Korean Scientist Group; Chinese
Academy of Sciences; Los Alamos National Laboratory;
Max-Planck-Institute for Astronomy (MPIA); Max-Planck-Institute for
Astrophysics (MPA); New Mexico State University; Ohio State University;
University of Pittsburgh; University of Portsmouth; Princeton
University; United States Naval Observatory; University of Washington;
W. M. Keck Foundation; University of Notre Dame; NASA/STScI
[HST-GO-10893.01-A]; DOE [DE-FG02-08ER41563, DE-FG02-08ER41562]
FX Funding for the SDSS and SDSS-II has been provided by the Alfred P.
Sloan Foundation, the Participating Institutions, the National Science
Foundation (NSF), the U.S. Department of Energy (DOE), the National
Aeronautics and Space Administration (NASA), the Japanese
Monbukagakusho, the Max Planck Society, and the Higher Education Funding
Council for England.; The SDSS Web site is http://www.sdss.org/. The
SDSS is managed by the Astrophysical Research Consortium for the
Participating Institutions. The Participating Institutions are the
American Museum of Natural History, Astrophysical Institute Potsdam,
University of Basel, University of Cambridge, Case Western Reserve
University, University of Chicago, Drexel University, Fermilab, the
Institute for Advanced Study, the Japan Participation Group, Johns
Hopkins University, the Joint Institute for Nuclear Astrophysics, the
Kavli Institute for Particle Astrophysics and Cosmology, the Korean
Scientist Group, the Chinese Academy of Sciences (LAMOST), Los Alamos
National Laboratory, the Max-Planck-Institute for Astronomy (MPIA), the
Max-Planck-Institute for Astrophysics (MPA), New Mexico State
University, Ohio State University, University of Pittsburgh, University
of Portsmouth, Princeton University, the United States Naval
Observatory, and the University of Washington.; Some of the data
presented herein were obtained at the W. M. Keck Observatory, which is
operated as a scientific partnership among the California Institute of
Technology, the University of California, and NASA; it was made possible
by the generous financial support of the W. M. Keck Foundation. The
authors recognize and acknowledge the very significant cultural role and
reverence that the summit of Mauna Kea has always had within the
indigenous Hawaiian community; we are most fortunate to have the
opportunity to conduct observations from this mountain. We thank the
Keck staff for their assistance.; We are grateful for the financial
support of the University of Notre Dame, NASA/STScI Grant
HST-GO-10893.01-A to C.M.M., the NSF, and the DOE, specifically NSF
grant AST-0908886 and DOE grant DE-FG02-08ER41563 to A.V.F. Support for
this research at Rutgers University was provided by DOE grant
DE-FG02-08ER41562 and NSF award AST-0847157 to S.W.J. We thank Brian
Hayden, Joe Gallagher, and Weidong Li for discussions and their help in
the production of this paper, Jerod Parrent and the Online Supernova
Spectrum Archive (SUSPECT), and David Jeffery along with the SUSPEND
database.
NR 97
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PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
EI 1538-4357
J9 ASTROPHYS J
JI Astrophys. J.
PD SEP 1
PY 2010
VL 720
IS 1
BP 704
EP 716
DI 10.1088/0004-637X/720/1/704
PG 13
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647DJ
UT WOS:000281596000061
ER
PT J
AU Li, ZY
Wang, P
Abel, T
Nakamura, F
AF Li, Zhi-Yun
Wang, Peng
Abel, Tom
Nakamura, Fumitaka
TI LOWERING THE CHARACTERISTIC MASS OF CLUSTER STARS BY MAGNETIC FIELDS AND
OUTFLOW FEEDBACK
SO ASTROPHYSICAL JOURNAL LETTERS
LA English
DT Article
DE ISM: clouds; ISM: magnetic fields; magnetohydrodynamics (MHD)
ID MOLECULAR CLOUDS; SINK PARTICLES; FRAGMENTATION; CORES; TURBULENCE;
SPECTRUM; CLUMPS; SIMULATIONS; EVOLUTION; COLLAPSE
AB Magnetic fields are generally expected to increase the characteristic mass of stars formed in stellar clusters, because they tend to increase the effective Jeans mass. We test this expectation using adaptive mesh refinement magnetohydrodynamical simulations of cluster formation in turbulent magnetized clumps of molecular clouds, treating stars as accreting sink particles. We find that, contrary to the common expectation, a magnetic field of the strength in the observed range decreases, rather than increases, the characteristic stellar mass. It (1) reduces the number of intermediate-mass stars that are formed through direct turbulent compression, because sub-regions of the clump with masses comparable to those of stars are typically magnetically subcritical and cannot be compressed directly into collapse, and (2) increases the number of low-mass stars that are produced from the fragmentation of dense filaments. The filaments result from mass accumulation along the field lines. In order to become magnetically supercritical and fragment, the filament must accumulate a large enough column density (proportional to the field strength), which yields a high volume density (and thus a small thermal Jeans mass) that is conducive to forming low-mass stars. We find, in addition, that the characteristic stellar mass is reduced further by outflow feedback. The conclusion is that both magnetic fields and outflow feedback are important in shaping the stellar initial mass function.
C1 [Li, Zhi-Yun] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
[Wang, Peng; Abel, Tom] Stanford Univ, SLAC, KIPAC, Menlo Pk, CA 94025 USA.
[Wang, Peng; Abel, Tom] Stanford Univ, Dept Phys, Menlo Pk, CA 94025 USA.
[Nakamura, Fumitaka] Natl Astron Observ, Tokyo 1818588, Japan.
RP Li, ZY (reprint author), Univ Virginia, Dept Astron, POB 400325, Charlottesville, VA 22904 USA.
EM zl4h@virginia.edu
FU NASA [NNG06GJ33G, NNX10AH30G]; [20540228]
FX This work was supported in part by NASA grants (NNG06GJ33G and
NNX10AH30G) and a Grant-in-Aid for Scientific Research of Japan
(20540228).
NR 38
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U1 0
U2 2
PU IOP PUBLISHING LTD
PI BRISTOL
PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 2041-8205
J9 ASTROPHYS J LETT
JI Astrophys. J. Lett.
PD SEP 1
PY 2010
VL 720
IS 1
BP L26
EP L30
DI 10.1088/2041-8205/720/1/L26
PG 5
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 647HW
UT WOS:000281610100006
ER
PT J
AU Liu, LJS
Phuleria, HC
Webber, W
Davey, M
Lawson, DR
Ireson, RG
Zielinska, B
Ondov, JM
Weaver, CS
Lapin, CA
Easter, M
Hesterberg, TW
Larson, T
AF Liu, L. -J. Sally
Phuleria, Harish C.
Webber, Whitney
Davey, Mark
Lawson, Douglas R.
Ireson, Robert G.
Zielinska, Barbara
Ondov, John M.
Weaver, Christopher S.
Lapin, Charles A.
Easter, Michael
Hesterberg, Thomas W.
Larson, Timothy
TI Quantification of self pollution from two diesel school buses using
three independent methods
SO ATMOSPHERIC ENVIRONMENT
LA English
DT Article
DE School bus; Self pollution; PM(2.5); Dual tracers; Tailpipe; Crankcase
emissions; Cabin air; Exposure
ID PARTICULATE MATTER; EXPOSURE; TRACER; AETHALOMETER; COMMUTES
AB We monitored two Seattle school buses to quantify the buses' self pollution using the dual tracers (DT), lead vehicle (LV), and chemical mass balance (CMB) methods. Each bus drove along a residential route simulating stops, with windows closed or open. Particulate matter (PM) and its constituents were monitored in the bus and from a LV. We collected source samples from the tailpipe and crankcase emissions using an on-board dilution tunnel. Concentrations of PM(1), ultrafine particle counts, elemental and organic carbon (EC/OC) were higher on the bus than the LV. The DT method estimated that the tailpipe and the crankcase emissions contributed 1.1 and 6.8 mu g m(-3) of PM(2.5) inside the bus, respectively, with significantly higher crankcase self pollution (SP) when windows were closed. Approximately two-thirds of in-cabin PM(2.5) originated from background sources. Using the LV approach, SP estimates from the EC and the active personal DataRAM (pDR) measurements correlated well with the DT estimates for tailpipe and crankcase emissions, respectively, although both measurements need further calibration for accurate quantification. CMB results overestimated SP from the DT method but confirmed crankcase emissions as the major SP source. We confirmed buses' SP using three independent methods and quantified crankcase emissions as the dominant contributor. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Liu, L. -J. Sally; Phuleria, Harish C.] Swiss Trop & Publ Hlth Inst, Basel, Switzerland.
[Liu, L. -J. Sally; Phuleria, Harish C.] Univ Basel, Basel, Switzerland.
[Liu, L. -J. Sally; Webber, Whitney; Davey, Mark] Univ Washington, Dept Environm & Occupat Hlth Sci, Seattle, WA 98195 USA.
[Lawson, Douglas R.] Natl Renewable Energy Lab, Golden, CO USA.
[Ireson, Robert G.] Air Qual Management Consulting, Greenbrae, CA USA.
[Zielinska, Barbara] Univ Nevada, Desert Res Inst, Div Atmospher Sci, Reno, NV 89506 USA.
[Ondov, John M.] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA.
[Weaver, Christopher S.] Engine Fuel & Emiss Engn Inc, Rancho Cordova, CA USA.
[Lapin, Charles A.] Lapin & Associates, Glendale, CA USA.
[Easter, Michael] Calif EnSIGHT, Walnut Creek, CA USA.
[Hesterberg, Thomas W.] Int Truck & Engine Corp, Warrenville, IL USA.
[Larson, Timothy] Univ Washington, Dept Civil & Environm Engn, Seattle, WA 98195 USA.
RP Liu, LJS (reprint author), Swiss Trop & Publ Hlth Inst, Socinstr 57, Basel, Switzerland.
EM sally.liu@unibas.ch
FU National Institute of Environmental Health Sciences; International Truck
and Engine Corporation with the University of Washington; U.S.
Department of Energy Office of FreedomCAR and Vehicle Technologies
through the National Renewable Energy Laboratory
FX This study was partially sponsored by the National Institute of
Environmental Health Sciences, a gift fund from the International Truck
and Engine Corporation with the University of Washington, and the U.S.
Department of Energy Office of FreedomCAR and Vehicle Technologies
through the National Renewable Energy Laboratory. We thank the technical
supports from David Anderson of the Seattle School District
Transportation Department, First Student, Inc., the Puget Sound Clean
Air Agency, and Bruce Hill of Clean Air task Force.
NR 29
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U2 14
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1352-2310
J9 ATMOS ENVIRON
JI Atmos. Environ.
PD SEP
PY 2010
VL 44
IS 28
BP 3422
EP 3431
DI 10.1016/j.atmosenv.2010.06.005
PG 10
WC Environmental Sciences; Meteorology & Atmospheric Sciences
SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
GA 638JX
UT WOS:000280891800010
PM 20694046
ER
PT J
AU Wang, LT
Jang, C
Zhang, Y
Wang, K
Zhang, QA
Streets, D
Fu, J
Lei, Y
Schreifels, J
He, KB
Hao, JM
Lam, YF
Lin, J
Meskhidze, N
Voorhees, S
Evarts, D
Phillips, S
AF Wang, Litao
Jang, Carey
Zhang, Yang
Wang, Kai
Zhang, Qiang
Streets, David
Fu, Joshua
Lei, Yu
Schreifels, Jeremy
He, Kebin
Hao, Jiming
Lam, Yun-Fat
Lin, Jerry
Meskhidze, Nicholas
Voorhees, Scott
Evarts, Dale
Phillips, Sharon
TI Assessment of air quality benefits from national air pollution control
policies in China. Part I: Background, emission scenarios and evaluation
of meteorological predictions
SO ATMOSPHERIC ENVIRONMENT
LA English
DT Article
DE Air pollution in China; Air quality modeling; Emission control;
MM5/CMAQ; 11th FYP
ID RIVER DELTA REGION; CMAQ MODELING SYSTEM; MM5 MESOSCALE MODEL;
TROPOSPHERIC NO2; EAST-ASIA; TRACE-P; RESOLUTION; INVENTORY; MM5-CMAQ;
EPISODE
AB Under the 11th Five Year Plan (FYP, 2006-2010) for national environmental protection by the Chinese government, the overarching goal for sulfur dioxide (SO2) controls is to achieve a total national emissions level of SO2 in 2010 10% lower than the level in 2005. A similar nitrogen oxides (NOx) emissions control plan is currently under development and could be enforced during the 12th FYP (2011-2015). In this study, the U.S. Environmental Protection Agency (U.S.EPA)'s Community Multi-Scale Air Quality (Models-3/CMAQ) modeling system was applied to assess the air quality improvement that would result from the targeted SO2 and NOx emission controls in China. Four emission scenarios - the base year 2005, the 2010 Business-As-Usual (BAU) scenario, the 2010 SO2 control scenario, and the 2010 NOx control scenario-were constructed and simulated to assess the air quality change from the national control plan. The Fifth-Generation NCAR/Penn State Mesoscale Model (MM5) was applied to generate the meteorological fields for the CMAQ simulations. In this Part I paper, the model performance for the simulated meteorology was evaluated against observations for the base case in terms of temperature, wind speed, wind direction, and precipitation. It is shown that MM5 model gives an overall good performance for these meteorological variables. The generated meteorological fields are acceptable for using in the CMAQ modeling. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Wang, Litao; Lei, Yu; Schreifels, Jeremy; He, Kebin; Hao, Jiming] Tsinghua Univ, Dept Environm Sci & Engn, Beijing 100084, Peoples R China.
[Wang, Litao] Hebei Univ Engn, Dept Environm Engn, Handan 056038, Hebei, Peoples R China.
[Jang, Carey; Voorhees, Scott; Evarts, Dale; Phillips, Sharon] US EPA, Res Triangle Pk, NC 27711 USA.
[Zhang, Yang; Wang, Kai; Meskhidze, Nicholas] N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA.
[Zhang, Qiang; Streets, David] Argonne Natl Lab, Decis & Informat Sci Div, Argonne, IL 60439 USA.
[Fu, Joshua; Lam, Yun-Fat] Univ Tennessee, Dept Civil & Environm Engn, Knoxville, TN 37996 USA.
[Schreifels, Jeremy] US EPA, Washington, DC 20460 USA.
[Lin, Jerry] Lamar Univ, Dept Civil Engn, Beaumont, TX 77710 USA.
RP Hao, JM (reprint author), Tsinghua Univ, Dept Environm Sci & Engn, Beijing 100084, Peoples R China.
EM hjm-den@tsinghua.edu.cn
RI Schreifels, Jeremy/F-6505-2011; Zhang, Qiang/D-9034-2012; Lei,
Yu/G-6247-2013; LAM, Yun Fat/K-7287-2015; lei, yu/D-3274-2016; Wang,
Kai/D-4262-2013; Lin, Che-Jen/K-1808-2013;
OI Schreifels, Jeremy/0000-0002-5830-3755; LAM, Yun
Fat/0000-0002-5917-0907; Wang, Kai/0000-0002-2375-5989; Lin,
Che-Jen/0000-0001-5990-3093; Streets, David/0000-0002-0223-1350
FU U.S. EPA/Office of Air Quality Planning & Standards at North Carolina
State University [4-321-0210288]; MEP at Tsinghua University, China
FX This study was sponsored by U.S. EPA/Office of Air Quality Planning &
Standards via contract #4-321-0210288 at North Carolina State University
and by MEP at Tsinghua University, China. Thanks are due to the U.S. EPA
for its technical support in CMAQ modeling.
NR 65
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U1 3
U2 61
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1352-2310
EI 1873-2844
J9 ATMOS ENVIRON
JI Atmos. Environ.
PD SEP
PY 2010
VL 44
IS 28
BP 3442
EP 3448
DI 10.1016/j.atmosenv.2010.05.051
PG 7
WC Environmental Sciences; Meteorology & Atmospheric Sciences
SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
GA 638JX
UT WOS:000280891800012
ER
PT J
AU Wang, LT
Jang, C
Zhang, Y
Wang, K
Zhang, QA
Streets, D
Fu, J
Lei, Y
Schreifels, J
He, KB
Hao, JM
Lam, YF
Lin, J
Meskhidze, N
Voorhees, S
Evarts, D
Phillips, S
AF Wang, Litao
Jang, Carey
Zhang, Yang
Wang, Kai
Zhang, Qiang
Streets, David
Fu, Joshua
Lei, Yu
Schreifels, Jeremy
He, Kebin
Hao, Jiming
Lam, Yun-Fat
Lin, Jerry
Meskhidze, Nicholas
Voorhees, Scott
Evarts, Dale
Phillips, Sharon
TI Assessment of air quality benefits from national air pollution control
policies in China. Part II: Evaluation of air quality predictions and
air quality benefits assessment
SO ATMOSPHERIC ENVIRONMENT
LA English
DT Article
DE Air pollution in China; Air quality modeling; Emission control;
MM5/CMAQ; 11th FYP
ID AEROSOL OPTICAL DEPTH; EASTERN CHINA; OZONE; MODIS; PM2.5; SUMMERTIME;
PRODUCTS; NOX
AB Following the meteorological evaluation in Part I, this Part II paper presents the statistical evaluation of air quality predictions by the U.S. Environmental Protection Agency (U.S. EPA)'s Community Multi-Scale Air Quality (Models-3/CMAQ) model for the four simulated months in the base year 2005. The surface predictions were evaluated using the Air Pollution Index (API) data published by the China Ministry of Environmental Protection (MEP) for 31 capital cities and daily fine particulate matter (PM2.5, particles with aerodiameter less than or equal to 2.5 mu m) observations of an individual site in Tsinghua University (THU). To overcome the shortage in surface observations, satellite data are used to assess the column predictions including tropospheric nitrogen dioxide (NO2) column abundance and aerosol optical depth (AOD). The result shows that CMAQ gives reasonably good predictions for the air quality.
The air quality improvement that would result from the targeted sulfur dioxide (SO2) and nitrogen oxides (NOx) emission controls in China were assessed for the objective year 2010. The results show that the emission controls can lead to significant air quality benefits. SO2 concentrations in highly polluted areas of East China in 2010 are estimated to be decreased by 30-60% compared to the levels in the 2010 Business-As-Usual (BAU) case. The annual PM2.5 can also decline by 3-15 mu g m(-3) (4-25%) due to the lower SO2 and sulfate concentrations. If similar controls are implemented for NOx emissions, NOx concentrations are estimated to decrease by 30-60% as compared with the 2010 BAU scenario. The annual mean PM2.5 concentrations will also decline by 2-14 mu g m(-3) (3-12%). In addition, the number of ozone (O-3) non-attainment areas in the northern China is projected to be much lower, with the maximum 1-h average O-3 concentrations in the summer reduced by 8-30 ppb. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Wang, Litao; Lei, Yu; Schreifels, Jeremy; He, Kebin; Hao, Jiming] Tsinghua Univ, Dept Environm Sci & Engn, Beijing 100084, Peoples R China.
[Wang, Litao] Hebei Univ Engn, Dept Environm Engn, Handan 056038, Hebei, Peoples R China.
[Jang, Carey; Voorhees, Scott; Evarts, Dale; Phillips, Sharon] US EPA, Res Triangle Pk, NC 27711 USA.
[Zhang, Yang; Wang, Kai; Meskhidze, Nicholas] N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA.
[Zhang, Qiang; Streets, David] Argonne Natl Lab, Decis & Informat Sci Div, Argonne, IL 60439 USA.
[Fu, Joshua; Lam, Yun-Fat] Univ Tennessee, Dept Civil & Environm Engn, Knoxville, TN 37996 USA.
[Schreifels, Jeremy] US EPA, Washington, DC 20460 USA.
[Lin, Jerry] Lamar Univ, Dept Civil Engn, Beaumont, TX 77710 USA.
RP Hao, JM (reprint author), Tsinghua Univ, Dept Environm Sci & Engn, Beijing 100084, Peoples R China.
EM hjm-den@tsinghua.edu.cn
RI Schreifels, Jeremy/F-6505-2011; Zhang, Qiang/D-9034-2012; Lei,
Yu/G-6247-2013; LAM, Yun Fat/K-7287-2015; lei, yu/D-3274-2016; Wang,
Kai/D-4262-2013; Lin, Che-Jen/K-1808-2013;
OI Schreifels, Jeremy/0000-0002-5830-3755; LAM, Yun
Fat/0000-0002-5917-0907; Wang, Kai/0000-0002-2375-5989; Lin,
Che-Jen/0000-0001-5990-3093; Streets, David/0000-0002-0223-1350
FU U.S. EPA/Office of Air Quality Planning & Standards at North Carolina
State University [4-321-0210288]; MEP at Tsinghua University, China
FX This study was sponsored by U.S. EPA/Office of Air Quality Planning &
Standards via contract #4-321-0210288 at North Carolina State University
and by MEP at Tsinghua University, China. Thanks are due to the U.S. EPA
for its technical support in CMAQ modeling.
NR 23
TC 35
Z9 45
U1 2
U2 77
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1352-2310
EI 1873-2844
J9 ATMOS ENVIRON
JI Atmos. Environ.
PD SEP
PY 2010
VL 44
IS 28
BP 3449
EP 3457
DI 10.1016/j.atmosenv.2010.05.058
PG 9
WC Environmental Sciences; Meteorology & Atmospheric Sciences
SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
GA 638JX
UT WOS:000280891800013
ER
PT J
AU Liu, XH
Zhang, Y
Xing, J
Zhang, QA
Wang, K
Streets, DG
Jang, C
Wang, WX
Hao, JM
AF Liu, Xiao-Huan
Zhang, Yang
Xing, Jia
Zhang, Qiang
Wang, Kai
Streets, David G.
Jang, Carey
Wang, Wen-Xing
Hao, Ji-Ming
TI Understanding of regional air pollution over China using CMAQ, part II.
Process analysis and sensitivity of ozone and particulate matter to
precursor emissions
SO ATMOSPHERIC ENVIRONMENT
LA English
DT Article
DE CMAQ; Process analysis; Indicators for O(3) and PM(2.5) chemistry; China
ID RADICAL PROPAGATION EFFICIENCY; INDICATORS; HYDROCARBONS; IMPACTS;
MODEL; AREA
AB Following model evaluation in part I, this part II paper focuses on the process analysis and chemical regime analysis for the formation of ozone (O(3)) and particulate matter with aerodynamic diameter less than or equal to 10 mu m (PM(10)) in China. The process analysis results show that horizontal transport is the main contributor to the accumulation of O(3) in Jan., Apr., and Oct., and gas-phase chemistry and vertical transport contribute to the production and accumulation of O(3) in Jul. Removal pathways of O(3) include vertical and horizontal transport, gas-phase chemistry, and cloud processes, depending on locations and seasons. PM(10) is mainly produced by primary emissions and aerosol processes and removed by horizontal transport. Cloud processes could either decrease or increase PM(10) concentrations, depending on locations and seasons. Among all indicators examined, the ratio of P(HNO3)/P(H2O2) provides the most robust indicator for O(3) chemistry, indicating a VOC-limited O(3) chemistry over most of the eastern China in Jan., NO(x)-limited in Jul., and either VOC- or NO(x)-limited in Apr. and Oct. O(3) chemistry is NO(x)-limited in most central and western China and VOC-limited in major cities throughout the year. The adjusted gas ratio. AdjGR, indicates that PM formation in the eastern China is most sensitive to the emissions of SO(2) and may be more sensitive to emission reductions in NO(x) than in NH(3). These results are fairly consistent with the responses of O(3) and PM(2.5) to the reductions of their precursor emissions predicted from sensitivity simulations. A 50% reduction of NO(x) or AVOC emissions leads to a reduction of O(3) over the eastern China. Unlike the reduction of emissions of SO(2), NO(x), and NH(3) that leads to a decrease in PM(10), a 50% reduction of AVOC emissions increases PM(10) levels. Such results indicate the complexity of O(3) and PM chemistry and a need for an integrated, region-specific emission control strategy with seasonal variations to effectively control both O(3) and PM(2.5) pollution in China. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Zhang, Yang] N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA.
[Liu, Xiao-Huan; Zhang, Yang; Wang, Wen-Xing] Shandong Univ, Jinan 250100, Shandong, Peoples R China.
[Xing, Jia; Hao, Ji-Ming] Tsinghua Univ, Beijing 100084, Peoples R China.
[Zhang, Qiang; Streets, David G.] Argonne Natl Lab, Argonne, IL 60439 USA.
[Jang, Carey] US EPA, Res Triangle Pk, NC 27711 USA.
RP Zhang, Y (reprint author), N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Campus Box 8208, Raleigh, NC 27695 USA.
EM yang_zhang@ncsu.edu
RI Zhang, Qiang/D-9034-2012; xing, jia/O-1784-2014; Wang, Kai/D-4262-2013;
OI Wang, Kai/0000-0002-2375-5989; Streets, David/0000-0002-0223-1350
FU U. S. NSF [Atm-0348819]; Shandong University in China; China Scholarship
Council at Shandong University in China; U.S. EPA at ANL
FX The authors thank Ping Liu at North Carolina State University, U. S. for
her help in setting up process analysis based on the CB05 mechanism in
CMAQ. This work was funded by the U. S. NSF Career Award, No.
Atm-0348819 and Shandong University in China. The meteorological
simulations were funded by China Scholarship Council at Shandong
University in China and the U.S. NSF Career Award No. Atm-0348819 at
NCSU. The emissions used for model simulations were funded by the U.S.
EPA at ANL.
NR 27
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U1 10
U2 87
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1352-2310
J9 ATMOS ENVIRON
JI Atmos. Environ.
PD SEP
PY 2010
VL 44
IS 30
BP 3719
EP 3727
DI 10.1016/j.atmosenv.2010.03.036
PG 9
WC Environmental Sciences; Meteorology & Atmospheric Sciences
SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
GA 662YU
UT WOS:000282851000013
ER
PT J
AU Romer, B
Enkel, T
Kronenberg, G
Henn, FA
Gass, P
Kempermann, G
Vollmayr, B
AF Roemer, B.
Enkel, T.
Kronenberg, G.
Henn, F. A.
Gass, P.
Kempermann, G.
Vollmayr, B.
TI INCREASED ADULT HIPPOCAMPAL NEUROGENESIS AND PERSISTENT HIPPOCAMPUS
DEPENDENT FEAR MEMORY IN A GENETIC ANIMAL MODEL FOR DEPRESSION
SO BEHAVIOURAL PHARMACOLOGY
LA English
DT Meeting Abstract
CT Meeting on Drugs, Psychiatric Disorders and Neurogenesis
CY SEP 03-05, 2010
CL Tours, FRANCE
C1 [Roemer, B.; Enkel, T.; Gass, P.; Vollmayr, B.] Univ Heidelberg, Dept Psychiat & Psychotherapy, Cent Inst Mental Hlth Mannheim, D-6800 Mannheim, Germany.
[Enkel, T.] Univ Heidelberg, Dept Mol Biol, D-6800 Mannheim, Germany.
[Kronenberg, G.] Charite, Dept Psychiat, D-13353 Berlin, Germany.
[Kempermann, G.] CRTD Ctr Regenerat Therapies Dresden, Dresden, Germany.
[Kempermann, G.] German Ctr Neurodegenerat Disorders DZNE Dresden, Dresden, Germany.
[Henn, F. A.] Brookhaven Natl Lab, Long Isl City, NY 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 0955-8810
J9 BEHAV PHARMACOL
JI Behav. Pharmacol.
PD SEP
PY 2010
VL 21
IS 5-6
BP 588
EP 588
PG 1
WC Behavioral Sciences; Neurosciences; Pharmacology & Pharmacy
SC Behavioral Sciences; Neurosciences & Neurology; Pharmacology & Pharmacy
GA 641IS
UT WOS:000281119000054
ER
PT J
AU Ponomarenko, NS
Poluektov, OG
Bylina, EJ
Norris, JR
AF Ponomarenko, N. S.
Poluektov, O. G.
Bylina, E. J.
Norris, J. R.
TI Electronic structure of the primary electron donor of Blastochloris
viridis heterodimer mutants: High-field EPR study
SO BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
LA English
DT Article
DE Blastochloris viridis; Heterodimer mutant; High-field EPR; Triplet
state; Heterodimer; Photosynthetic reaction center; Cytochrome; Electron
transfer
ID PHOTOSYNTHETIC REACTION-CENTER; PRIMARY CHARGE SEPARATION;
RHODOBACTER-SPHAEROIDES R-26; BACTERIOCHLOROPHYLL-BACTERIOPHEOPHYTIN
DIMER; BACTERIUM RHODOPSEUDOMONAS-VIRIDIS; REACTION CENTERS;
PARAMAGNETIC-RESONANCE; CYTOCHROME SUBUNIT; SPECIAL PAIR; TETRAHEME
CYTOCHROME
AB High-field electron paramagnetic resonance (HF EPR) has been employed to investigate the primary electron donor electronic structure of Blastochloris viridis heterodimer mutant reaction centers (RCs). In these mutants the amino acid substitution His(M200)Leu or His(L173)Leu eliminates a ligand to the primary electron donor, resulting in the loss of a magnesium in one of the constituent bacteriochlorophylls (BChl). Thus, the native BChl/BChl homodimer primary donor is converted into a BChl/bacteriopheophytin (BPhe) heterodimer. The heterodimer primary donor radical in chemically oxidized RCs exhibits a broadened EPR line indicating a highly asymmetric distribution of the unpaired electron over both dimer constituents. Observed triplet state EPR signals confirm localization of the excitation on the BChl half of the heterodimer primary donor. Theoretical simulation of the triplet EPR lineshapes clearly shows that, in the case of mutants, triplet states are formed by an intersystem crossing mechanism in contrast to the radical pair mechanism in wild type RCs. Photooxidation of the mutant RCs results in formation of a BPhe anion radical within the heterodimer pair. The accumulation of an intradimer BPhe anion is caused by the substantial loss of interaction between constituents of the heterodimer primary donor along with an increase in the reduction potential of the heterodimer primary donor D/D(+) couple. This allows oxidation of the cytochrome even at cryogenic temperatures and reduction of each constituent of the heterodimer primary donor individually. Despite a low yield of primary donor radicals, the enhancement of the semiquinone-iron pair EPR signals in these mutants indicates the presence of kinetically viable electron donors. Published by Elsevier B.V.
C1 [Poluektov, O. G.] Argonne Natl Lab, Chem Sci & Engn Div, Argonne, IL 60439 USA.
[Ponomarenko, N. S.; Bylina, E. J.; Norris, J. R.] Univ Chicago, Dept Chem, Chicago, IL 60637 USA.
RP Poluektov, OG (reprint author), Argonne Natl Lab, Chem Sci & Engn Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM Oleg@anl.gov
FU Division of Chemical Sciences, Geosciences, and Biosciences, Office of
Basic Energy Sciences of the U.S. Department of Energy
[DEFG02-96ER14675, DE-AC02-06CH11357]
FX N.S.P. would like to thank Dr. Richard Baxter for expert assistance in
employing molecular structure visualization. The help of Dr. S. V.
Pachtchenko in the simulation of HF EPR spectra is greatly appreciated.
We gratefully acknowledge L M. Rantala and L M. Utschig for editing the
manuscript. Work at University of Chicago was funded by the Division of
Chemical Sciences, Geosciences, and Biosciences, Office of Basic Energy
Sciences of the U.S. Department of Energy through Grant
DEFG02-96ER14675. Work at ANL was supported by the Division of Chemical
Sciences, Geosciences, and Biosciences, Office of Basic Energy Sciences
of the U.S. Department of Energy through Grant DE-AC02-06CH11357.
NR 89
TC 6
Z9 6
U1 0
U2 9
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0005-2728
J9 BBA-BIOENERGETICS
JI Biochim. Biophys. Acta-Bioenerg.
PD SEP
PY 2010
VL 1797
IS 8
BP 1617
EP 1626
DI 10.1016/j.bbabio.2010.06.002
PG 10
WC Biochemistry & Molecular Biology; Biophysics
SC Biochemistry & Molecular Biology; Biophysics
GA 636OX
UT WOS:000280748600005
PM 20542012
ER
PT J
AU Buchko, GW
Tarasevich, BJ
Roberts, J
Snead, ML
Shaw, WJ
AF Buchko, Garry W.
Tarasevich, Barbara J.
Roberts, Jacky
Snead, Malcolm L.
Shaw, Wendy J.
TI A solution NMR investigation into the murine amelogenin splice-variant
LRAP (Leucine-Rich Amelogenin Protein)
SO BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS
LA English
DT Article
DE LRAP; Intrinsic disorder; Nanosphere self-assembly; Amelogenesis;
Enamel; NMR spectroscopy; Dynamic light scattering; Biomineralization;
Cell signaling
ID DYNAMIC LIGHT-SCATTERING; ATOMIC-FORCE MICROSCOPY; RECOMBINANT
AMELOGENIN; RESONANCE ASSIGNMENTS; PORCINE AMELOGENIN; ESCHERICHIA-COLI;
ENAMEL FORMATION; MATRIX PROTEINS; SECRETORY-STAGE; STATE NMR
AB Amelogenins are the dominant proteins present in ameloblasts during the early stages of enamel biomineralization, making up >90% of the matrix protein. Along with the full-length protein there are several splice-variant isoforms of amelogenin present including LRAP (Leucine-Rich Amelogenin Protein), a protein that consists of the first 33 and the last 26 residues of full-length amelogenin. Using solution-state NMR spectroscopy we have assigned the (1)H-(15)N HSQC spectrum of murine LRAP (rp(H)LRAP) in 2% acetic acid at pH 3.0 by making extensive use of previous chemical shift assignments for full-length murine amelogenin (rp(H) M180). This correlation was possible because LRAP, like the full-length protein, is intrinsically disordered under these solution conditions. The major difference between the (1)H-(15)N HSQC spectra of rp(H)M180 and rp (H)LRAP was an additional set of amide resonances for each of the seven non-proline residues between S12* and Y12 near the N-terminus of rp(H)LRAP indicating that the N-terminal region of LRAP exists in two different conformations. Analysis of the proline carbon chemical shifts suggests that the molecular basis for the two states is not a cis-trans isomerization of one or more of the proline residues in the N-terminal region. Starting from 2% acetic acid, where rp(H)LRAP was monomeric in solution, NaCl addition effected residue specific changes in molecular dynamics manifested by the reduction in intensity and disappearance of (1)H-(15)N HSQC cross peaks. As observed for the full-length protein, these perturbations may signal early events governing supramolecular self-assembly of rp(H)LRAP into nanospheres. However, the different patterns of (1)H-(15)N HSQC cross peak perturbation between rp(H)LRAP and rp(H)M180 in high salt suggest that the termini may behave differently in their respective nanospheres, and perhaps, these differences contribute to the cell signaling properties attributable to LRAP but not to the full-length protein. (C) 2010 Elsevier By. All rights reserved.
C1 [Tarasevich, Barbara J.; Roberts, Jacky; Shaw, Wendy J.] Pacific NW Natl Lab, Div Chem Sci, Richland, WA 99352 USA.
[Buchko, Garry W.] Pacific NW Natl Lab, Div Biol Sci, Richland, WA 99352 USA.
[Snead, Malcolm L.] Univ So Calif, Ctr Craniofacial Mol Biol, Los Angeles, CA 90033 USA.
RP Shaw, WJ (reprint author), Pacific NW Natl Lab, Div Chem Sci, Richland, WA 99352 USA.
EM Wendy.shaw@pnl.gov
RI Buchko, Garry/G-6173-2015
OI Buchko, Garry/0000-0002-3639-1061
FU NIH-NIDCR [DE-015347, DE06988]; Laboratory Directed Research Development
(LDRD); U.S. DOE
FX This research was supported by NIH-NIDCR Grant DE-015347, DE06988 (MIS)
and internal Laboratory Directed Research Development (LDRD) funds. The
research was performed at the Pacific Northwest National Laboratory
(PNNL), a facility operated by Battelle for the U.S. Department of
Energy, and at the W.R. Wiley Environmental Molecular Sciences
Laboratory (EMSL), a national scientific user facility sponsored by the
U.S. DOE Biological and Environmental Research program.
NR 51
TC 9
Z9 9
U1 0
U2 6
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1570-9639
J9 BBA-PROTEINS PROTEOM
JI BBA-Proteins Proteomics
PD SEP
PY 2010
VL 1804
IS 9
BP 1768
EP 1774
DI 10.1016/j.bbapap.2010.03.006
PG 7
WC Biochemistry & Molecular Biology; Biophysics
SC Biochemistry & Molecular Biology; Biophysics
GA 639LR
UT WOS:000280976800009
PM 20304108
ER
PT J
AU Zeng, YN
Saar, BG
Friedrich, MG
Chen, F
Liu, YS
Dixon, RA
Himmel, ME
Xie, XS
Ding, SY
AF Zeng, Yining
Saar, Brian G.
Friedrich, Marcel G.
Chen, Fang
Liu, Yu-San
Dixon, Richard A.
Himmel, Michael E.
Xie, X. Sunney
Ding, Shi-You
TI Imaging Lignin-Downregulated Alfalfa Using Coherent Anti-Stokes Raman
Scattering Microscopy
SO BIOENERGY RESEARCH
LA English
DT Article
DE Lignin; Chemical image; Coherent anti-Stokes Raman scattering (CARS);
Lignin-downregulated alfalfa
ID HIGH-SENSITIVITY; CELL-WALLS; BIOMASS; LIGNIFICATION; PLANTS
AB Targeted lignin modification in bioenergy crops could potentially improve conversion efficiency of lignocellulosic biomass to biofuels. To better assess the impact of lignin modification on overall cell wall structure, wild-type and lignin-downregulated alfalfa lines were imaged using coherent anti-Stokes Raman scattering (CARS) microscopy. The 1,600-cm(-1) Raman mode was used in CARS imaging to specifically represent the lignin signal in the plant cell walls. The intensities of the CARS signal follow the general trend of lignin contents in cell walls from both wild-type and lignin-downregulated plants. In the downregulated lines, the overall reduction of lignin content agreed with the previously reported chemical composition. However, greater reduction of lignin content in cell corners was observed by CARS imaging, which could account for the enhanced susceptibility to chemical and enzymatic hydrolysis observed previously.
C1 [Zeng, Yining; Liu, Yu-San; Himmel, Michael E.; Ding, Shi-You] Natl Renewable Energy Lab, Biosci Ctr, Golden, CO 80401 USA.
[Saar, Brian G.; Friedrich, Marcel G.; Xie, X. Sunney] Harvard Univ, Dept Chem & Chem Biol, Cambridge, MA 02138 USA.
[Chen, Fang; Dixon, Richard A.] Samuel Roberts Noble Fdn Inc, Div Plant Biol, Ardmore, OK 73401 USA.
[Zeng, Yining; Chen, Fang; Liu, Yu-San; Dixon, Richard A.; Himmel, Michael E.; Ding, Shi-You] Oak Ridge Natl Lab, Bioenergy Sci Ctr BESC, Oak Ridge, TN USA.
RP Ding, SY (reprint author), Natl Renewable Energy Lab, Biosci Ctr, 1617 Cole Blvd, Golden, CO 80401 USA.
EM xie@chemistry.harvard.edu; Shi.you.Ding@nrel.gov
RI Ding, Shi-You/O-1209-2013
FU [DE-FG02-07ER64500]
FX The authors thank Gary R. Holtom from Harvard University for his help
and valuable discussion on CARS setup. The authors gratefully
acknowledge the US Department of Energy, the Office of Science, Office
of Biological and Environmental Research through the BioEnergy Science
Center (BESC), a DOE Bioenergy Research Center, for the work on CARS
imaging and analysis, and grant DE-FG02-07ER64500 for support to develop
the CARS microscope.
NR 19
TC 30
Z9 31
U1 1
U2 35
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1939-1234
J9 BIOENERG RES
JI BioEnergy Res.
PD SEP
PY 2010
VL 3
IS 3
BP 272
EP 277
DI 10.1007/s12155-010-9079-1
PG 6
WC Energy & Fuels; Environmental Sciences
SC Energy & Fuels; Environmental Sciences & Ecology
GA 637HJ
UT WOS:000280807800006
ER
PT J
AU Srivastava, AC
Palanichelvam, K
Ma, JY
Steele, J
Blancaflor, EB
Tang, YH
AF Srivastava, Avinash C.
Palanichelvam, Karuppaiah
Ma, Junying
Steele, Jarrod
Blancaflor, Elison B.
Tang, Yuhong
TI Collection and Analysis of Expressed Sequence Tags Derived from Laser
Capture Microdissected Switchgrass (Panicum virgatum L. Alamo) Vascular
Tissues
SO BIOENERGY RESEARCH
LA English
DT Article
DE Expressed sequence tags; Laser-capture microdissection; Lignin;
Secondary cell wall; Switchgrass; Vascular tissue
ID TRANSCRIPTION FACTORS; LIGNIN BIOSYNTHESIS; CELLULOSIC ETHANOL; BIOFUEL
PRODUCTION; GENE-EXPRESSION; DIRIGENT SITES; CELL-WALLS; ARABIDOPSIS;
PEROXIDASE; IDENTIFICATION
AB Switchgrass is a perennial C4 grass that thrives in a wide range of North American habitats and is an emerging crop for the production of lignocellulosic biofuels. Lignin is an integral component of secondary plant cell walls that provides structural rigidity to the cell wall but it interferes with the conversion of cellulose to fermentable sugars by preventing chemical access to cellulose. Thus, one strategy for improving production of cellulosic ethanol is the down-regulation of lignin in plants. To achieve this goal, it is important to understand the molecular processes involved in vascular tissue development, lignification and secondary wall synthesis. Since active lignification occurs in the vascular system of the plant, we refined a protocol for isolating vascular tissues using laser-capture microdissection (LCM) in an effort to identify transcripts of switchgrass involved in lignification and secondary cell wall synthesis. ESTs (5,734) were sequenced from the cDNA libraries derived from laser microdissected vascular tissues. These Sanger sequences converged into 2,766 unigenes with an average length of 652 bp. Gene ontology of the unigenes indicated that 11% of the sequences were lignin and cell wall related. Several transcription factors involved in lignin and secondary cell wall synthesis and sugar- or vesicle-mediated transporters were also present in this EST data set. In situ hybridization of seven representative genes confirmed the preferential expression of five genes in the vascular tissues. Comparison of our switchgrass vascular tissue derived ESTs with that of other plant species validated our LCM approach. Furthermore, our switchgrass vascular tissue ESTs revealed additional lignin and cell wall related genes that were not present in other existing switchgrass EST collections. Inventory of the switchgrass vascular tissue ESTs presented here provides an important genomic resource for mining genes to reduce recalcitrance in this important bioenergy crop.
C1 [Srivastava, Avinash C.; Palanichelvam, Karuppaiah; Ma, Junying; Steele, Jarrod; Blancaflor, Elison B.; Tang, Yuhong] Samuel Roberts Noble Fdn Inc, Div Plant Biol, Ardmore, OK 73401 USA.
[Srivastava, Avinash C.; Ma, Junying; Blancaflor, Elison B.; Tang, Yuhong] US DOE, BioEnergy Sci Ctr BESC, Ardmore, OK USA.
RP Tang, YH (reprint author), Samuel Roberts Noble Fdn Inc, Div Plant Biol, 2510 Sam Noble Pkwy, Ardmore, OK 73401 USA.
EM ytang@noble.org
FU Samuel Roberts Noble Foundation; Office of Biological and Environmental
Research in the DOE Office of Science US Department of Energy
FX We thank Drs Zengyu Wang and Jiyi Zhang for critical reading of the
manuscript, and Dr. Ji He, for assistance with the EST data analysis.
The research described in this paper was carried out as part of the BESC
(The BioEnergy Science Center is a U.S. Department of Energy Bioenergy
Research Center supported by the Office of Biological and Environmental
Research in the DOE Office of Science US Department of Energy) and also
funded by the Samuel Roberts Noble Foundation. Neither the United States
Government nor any agency thereof, nor any of their employees, makes any
warranty, express or implied, or assumes any legal 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 any agency thereof. The views and opinions of the authors expressed
herein do not necessarily reflect those of the United States Government
or any agency thereof.
NR 39
TC 11
Z9 11
U1 1
U2 11
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1939-1234
J9 BIOENERG RES
JI BioEnergy Res.
PD SEP
PY 2010
VL 3
IS 3
BP 278
EP 294
DI 10.1007/s12155-010-9080-8
PG 17
WC Energy & Fuels; Environmental Sciences
SC Energy & Fuels; Environmental Sciences & Ecology
GA 637HJ
UT WOS:000280807800007
ER
PT J
AU Volkow, ND
Wang, GJ
Fowler, JS
Tomasi, D
Telang, F
Baler, R
AF Volkow, Nora D.
Wang, Gene-Jack
Fowler, Joanna S.
Tomasi, Dardo
Telang, Frank
Baler, Ruben
TI Addiction: Decreased reward sensitivity and increased expectation
sensitivity conspire to overwhelm the brain's control circuit
SO BIOESSAYS
LA English
DT Review
DE addiction; brain disease; dopamine; reward circuit
ID STRIATAL DOPAMINE RELEASE; NUCLEUS-ACCUMBENS; COCAINE ABUSERS;
DRUG-ADDICTION; METHYLPHENIDATE; HUMANS; RECEPTORS; OCCUPANCY; SYSTEMS;
RATS
AB Based on brain imaging findings, we present a model according to which addiction emerges as an imbalance in the information processing and integration among various brain circuits and functions. The dysfunctions reflect (a) decreased sensitivity of reward circuits, (b) enhanced sensitivity of memory circuits to conditioned expectations to drugs and drug cues, stress reactivity, and (c) negative mood, and a weakened control circuit. Although initial experimentation with a drug of abuse is largely a voluntary behavior, continued drug use can eventually impair neuronal circuits in the brain that are involved in free will, turning drug use into an automatic compulsive behavior. The ability of addictive drugs to co-opt neurotransmitter signals between neurons (including dopamine, glutamate, and GABA) modifies the function of different neuronal circuits, which begin to falter at different stages of an addiction trajectory. Upon exposure to the drug, drug cues or stress this results in unrestrained hyperactivation of the motivation/drive circuit that results in the compulsive drug intake that characterizes addiction.
C1 [Volkow, Nora D.; Baler, Ruben] Natl Inst Drug Abuse, NIH, Bethesda, MD USA.
[Wang, Gene-Jack; Fowler, Joanna S.; Tomasi, Dardo; Telang, Frank] Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA.
RP Volkow, ND (reprint author), Natl Inst Drug Abuse, NIH, Bethesda, MD USA.
EM nvolkow@nida.nih.gov
RI Tomasi, Dardo/J-2127-2015
FU Intramural NIH HHS [ZIA AA000550-06]
NR 54
TC 127
Z9 131
U1 3
U2 27
PU JOHN WILEY & SONS INC
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN, NJ 07030 USA
SN 0265-9247
J9 BIOESSAYS
JI Bioessays
PD SEP
PY 2010
VL 32
IS 9
BP 748
EP 755
DI 10.1002/bies.201000042
PG 8
WC Biochemistry & Molecular Biology; Biology
SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other
Topics
GA 647NK
UT WOS:000281625000005
PM 20730946
ER
PT J
AU Inman, D
Nagle, N
Jacobson, J
Searcy, E
Ray, AE
AF Inman, Daniel
Nagle, Nick
Jacobson, Jacob
Searcy, Erin
Ray, Allison E.
TI Feedstock handling and processing effects on biochemical conversion to
biofuels
SO BIOFUELS BIOPRODUCTS & BIOREFINING-BIOFPR
LA English
DT Review
DE biochemical conversion; pre-processing; biomass composition; feedstock
logistics
ID CORN STOVER FRACTIONS; CROP RESIDUES; ENZYMATIC-HYDROLYSIS; LIME
PRETREATMENT; SWITCHGRASS; BIOMASS; HARVEST; STORAGE; ENERGY; CARBON
AB Abating the dependence of the United States on foreign oil by reducing oil consumption and increasing biofuels usage will have far-reaching global effects. These include reduced greenhouse gas emissions and an increased demand for biofuel feedstocks. To support this increased demand, cellulosic feedstock production and conversion to biofuels (e. g. ethanol, butanol) is being aggressively researched. Thus far, research has primarily focused on optimizing feedstock production and ethanol conversion, with less attention given to the feedstock supply chain required to meet cost, quality, and quantity goals. This supply chain comprises a series of unit operations from feedstock harvest to feeding the conversion process. Our objectives in this review are (i) to summarize the peer-reviewed literature on harvest-to-reactor throat variables affecting feedstock composition and conversion to ethanol; (ii) to identify knowledge gaps; and (iii) to recommend future steps. (C) 2010 Society of Chemical Industry and John Wiley & Sons, Ltd
C1 [Inman, Daniel] Natl Renewable Energy Lab, Natl Bioenergy Ctr, Golden, CO 80401 USA.
[Jacobson, Jacob; Searcy, Erin; Ray, Allison E.] Idaho Natl Lab, Idaho Falls, ID USA.
RP Inman, D (reprint author), Natl Renewable Energy Lab, Natl Bioenergy Ctr, 1617 Cole Blvd, Golden, CO 80401 USA.
EM Daniel.Inman@nrel.gov
NR 62
TC 8
Z9 8
U1 1
U2 19
PU JOHN WILEY & SONS LTD
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND
SN 1932-104X
J9 BIOFUEL BIOPROD BIOR
JI Biofuels Bioprod. Biorefining
PD SEP-OCT
PY 2010
VL 4
IS 5
BP 562
EP 573
DI 10.1002/bbb.241
PG 12
WC Biotechnology & Applied Microbiology; Energy & Fuels
SC Biotechnology & Applied Microbiology; Energy & Fuels
GA 660TH
UT WOS:000282667100016
ER
PT J
AU Wang, XJ
Messman, J
Mays, JW
Baskaran, D
AF Wang, Xiaojun
Messman, Jamie
Mays, Jimmy W.
Baskaran, Durairaj
TI Polypeptide Grafted Hyaluronan: Synthesis and Characterization
SO BIOMACROMOLECULES
LA English
DT Article
ID MICHAEL ADDITION POLYMERIZATIONS; ATOMIC-FORCE MICROSCOPY;
CHEMICAL-MODIFICATION; CIRCULAR-DICHROISM; ACID HYDROGELS; BIOMATERIALS;
CONFORMATION; DIACRYLATES; DERIVATIVES; SCAFFOLDS
AB Poly(L-leucine) grafted hyaluronan (HA-g-PLeu) has been synthesized via a Michael addition reaction between primary amine terminated poly(L-leucine) and acrylate-functionalized HA (TBAHA-acrylate). The precursor hyaluronan was first functionalized with acrylate groups by reaction with acryloyl chloride in the presence of triethylamine in N,N-dimethylformamide. (1)H NMR analysis of the resulting product indicated that an increase in the concentration of acryloylchoride with respect to hydroxyl groups on HA has only a moderate effect on functionalization efficiency, f. A precise control of stoichiometry was not achieved, which could be attributed to partial solubility of intermolecular aggregates and the hygroscopic nature of HA. Michael addition at high [PLeu-NH(2)]/[acrylate](TBAHA) ratios gave a molar grafting ratio of only 0.20 with respect to the repeat unit of HA, indicating grafting limitation due to insolubility of the grafted HA-g-PLeu. Soluble HA-g-PLeu graft copolymers were obtained for low grafting ratios (<0.039) with <8.6% by mass of PLeu and were characterized thoroughly using light scattering, (1)H NMR, FT-IR, and AFM techniques. Light scattering experiments showed a strong hydrophobic interaction between PLeu chains, resulting in aggregates with segregated nongrafted HA segments. This yields local networks of aggregates, as demonstrated by atomic force microscopy. Circular dichroism spectroscopy showed a beta-sheet conformation for aggregates of poly(L-leucine).
C1 [Wang, Xiaojun; Mays, Jimmy W.; Baskaran, Durairaj] Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA.
[Messman, Jamie; Mays, Jimmy W.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
RP Mays, JW (reprint author), Univ Tennessee, Dept Chem, Knoxville, TN 37996 USA.
EM jimmymays@utk.edu; baskaran@utk.edu
RI Wang, Xiaojun/E-5510-2012; Durairaj, Baskaran/C-3692-2009
OI Durairaj, Baskaran/0000-0002-6886-5604
FU National Institutes of Health [5R21EB4947]; Scientific User Facilities
Division, Office of Basic Energy Sciences, U.S. Department of Energy
FX This work was partially supported by a grant from the National
Institutes of Health (grant number 5R21EB4947). The work at Oak Ridge
National Laboratory's Center for Nanophase Materials Sciences was
sponsored by the Scientific User Facilities Division, Office of Basic
Energy Sciences, U.S. Department of Energy. We appreciate
characterization help from Tom Malmgren in the Polymer Characterization
Laboratory at the University of Tennessee, Knoxville. We thank Professor
N. Hadjichristidis for the end-functionalized poly(L-leucine).
NR 51
TC 7
Z9 7
U1 1
U2 25
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1525-7797
J9 BIOMACROMOLECULES
JI Biomacromolecules
PD SEP
PY 2010
VL 11
IS 9
BP 2313
EP 2320
DI 10.1021/bm1004146
PG 8
WC Biochemistry & Molecular Biology; Chemistry, Organic; Polymer Science
SC Biochemistry & Molecular Biology; Chemistry; Polymer Science
GA 647PB
UT WOS:000281629600017
PM 20690642
ER
PT J
AU Pingali, SV
Urban, VS
Heller, WT
McGaughey, J
O'Neill, H
Foston, M
Myles, DA
Ragauskas, A
Evans, BR
AF Pingali, Sai Venkatesh
Urban, Volker S.
Heller, William T.
McGaughey, Joseph
O'Neill, Hugh
Foston, Marcus
Myles, Dean A.
Ragauskas, Arthur
Evans, Barbara R.
TI Breakdown of Cell Wall Nanostructure in Dilute Acid Pretreated Biomass
SO BIOMACROMOLECULES
LA English
DT Article
ID X-RAY-SCATTERING; SMALL-ANGLE SCATTERING; NEUTRON FIBER DIFFRACTION;
HYDROGEN-BONDING SYSTEM; NATIVE CELLULOSE; CORN STOVER; ENZYMATIC
SACCHARIFICATION; CRYSTAL-STRUCTURE; HIGH-TEMPERATURES; LIGNIN
AB The generation of bioethanol from lignocellulosic biomass holds great promise for renewable and clean energy production. A better understanding of the complex mechanisms of lignocellulose breakdown during various pretreatment methods is needed to realize this potential in a cost and energy efficient way. Here we use small-angle neutron scattering (SANS) to characterize morphological changes in switchgrass lignocellulose across molecular to submicrometer length scales resulting from the industrially relevant dilute acid pretreatment method. Our results demonstrate that dilute acid pretreatment increases the cross-sectional radius of the crystalline cellulose fibril. This change is accompanied by removal of hemicellulose and the formation of R-g similar to 135 angstrom lignin aggregates. The structural signature of smooth cell wall surfaces is observed at length scales larger than 1000 angstrom, and it remains remarkably invariable during pretreatment. This study elucidates the interplay of the different biomolecular components in the breakdown process of switchgrass by dilute acid pretreatment. The results are important for the development of efficient strategies of biomass to biofuel conversion.
C1 [Pingali, Sai Venkatesh; Urban, Volker S.; Heller, William T.; O'Neill, Hugh; Myles, Dean A.] Oak Ridge Natl Lab, Ctr Struct Mol Biol, Oak Ridge, TN 37831 USA.
[McGaughey, Joseph; Evans, Barbara R.] Oak Ridge Natl Lab, Mol Biosci & Biotechnol Grp, Div Chem Sci, Oak Ridge, TN 37831 USA.
[Foston, Marcus; Ragauskas, Arthur] Georgia Inst Technol, Sch Chem & Biochem, Inst Paper Sci & Technol, Atlanta, GA 30332 USA.
RP Pingali, SV (reprint author), Oak Ridge Natl Lab, Ctr Struct Mol Biol, Oak Ridge, TN 37831 USA.
EM pingalis@ornl.gov; urbanvs@ornl.gov; evansb@ornl.gov
RI Urban, Volker/N-5361-2015; myles, dean/D-5860-2016;
OI Urban, Volker/0000-0002-7962-3408; myles, dean/0000-0002-7693-4964;
Pingali, Sai Venkatesh/0000-0001-7961-4176; O'Neill,
Hugh/0000-0003-2966-5527; Ragauskas, Arthur/0000-0002-3536-554X
FU Office of Biological and Environmental Research, U.S. Department of
Energy [FWP ERKP752, DE-AC05-00OR22725]; Oak Ridge National Laboratory
[S07-019]
FX Switchgrass samples were obtained through a collaborative agreement with
the Bioenergy Science Center (BESC) located at the Oak Ridge National
Laboratory, Oak Ridge, Tennessee. Paul A. Menchhofer and Kimberly Shawn
Reeves are acknowledged for their assistance with generating SEM images.
This research is funded by the Genomic Science Program, Office of
Biological and Environmental Research, U.S. Department of Energy, under
FWP ERKP752. Preliminary research was funded by an award (S07-019) from
the Seed Money Fund of the Laboratory Directed Research and Development
Fund, Oak Ridge National Laboratory. This research at Oak Ridge National
Laboratory's Center for Structural Molecular Biology (CSMB) was
supported by the Office of Biological and Environmental Research, using
facilities supported by the U.S. Department of Energy, managed by
UT-Battelle, LLC under Contract No. DE-AC05-00OR22725,
NR 63
TC 73
Z9 73
U1 5
U2 40
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1525-7797
J9 BIOMACROMOLECULES
JI Biomacromolecules
PD SEP
PY 2010
VL 11
IS 9
BP 2329
EP 2335
DI 10.1021/bm100455h
PG 7
WC Biochemistry & Molecular Biology; Chemistry, Organic; Polymer Science
SC Biochemistry & Molecular Biology; Chemistry; Polymer Science
GA 647PB
UT WOS:000281629600019
PM 20726544
ER
PT J
AU Humbird, D
Mohagheghi, A
Dowe, N
Schell, DJ
AF Humbird, David
Mohagheghi, Ali
Dowe, Nancy
Schell, Daniel J.
TI Economic Impact of Total Solids Loading on Enzymatic Hydrolysis of
Dilute Acid Pretreated Corn Stover
SO BIOTECHNOLOGY PROGRESS
LA English
DT Article
DE ethanol; enzymatic hydrolysis; cost; fermentation
ID LIGNOCELLULOSE; FERMENTATION; BIOMASS; ETHANOL
AB In process integration studies of the biomass-to-ethanol conversion process. it is necessary to understand how cellulose conversion yields vary as a function of solids and enzyme loading and other key operating variables. The impact of solids loading on enzymatic cellulose hydrolysis of dilute acid pretreated corn stover slurry was determined using an experimental response surface design methodology. From the experimental work, an empirical correlation was obtained that expresses monomeric glucose yield from enzymatic cellulose hydrolysis as a function of solids loading, enzyme loading, and temperature. This correlation was used in a technoeconomic model to study the impact of solids loading on ethanol production economics. The empirical correlation was used to provide a more realistic assessment of process cost by accounting for changes in cellulose conversion yields at different solids and enzyme loadings as well as enzyme cost. As long as enzymatic cellulose conversion drops off at higher total solids loading (due to end-product inhibition or other factors), there is an optimum value for the total solids loading that minimizes the ethanol production cost. The optimum total solids loading shifts to higher values as enzyme cost decreases. (C) 2010 American Institute of Chemical Engineers Biotechnol. Prog., 26: 1245-1251, 2010
C1 [Humbird, David; Mohagheghi, Ali; Dowe, Nancy; Schell, Daniel J.] Natl Renewable Energy Lab, Natl Bioenergy Ctr, Golden, CO 80401 USA.
RP Humbird, D (reprint author), Natl Renewable Energy Lab, Natl Bioenergy Ctr, Golden, CO 80401 USA.
EM david.humbird@nrel.gov
FU Department of Energy's Office the Biomass Program
FX The work was funded by the Department of Energy's Office the Biomass
Program. The authors wish to thank Jody Farmer, Bob Lyons, Wes Hjelm and
Bill Bray of NREL for producing the pretreated corn stover.
NR 16
TC 38
Z9 38
U1 5
U2 28
PU JOHN WILEY & SONS LTD
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER PO19 8SQ, W SUSSEX, ENGLAND
SN 8756-7938
J9 BIOTECHNOL PROGR
JI Biotechnol. Prog.
PD SEP-OCT
PY 2010
VL 26
IS 5
BP 1245
EP 1251
DI 10.1002/btpr.441
PG 7
WC Biotechnology & Applied Microbiology; Food Science & Technology
SC Biotechnology & Applied Microbiology; Food Science & Technology
GA 671EC
UT WOS:000283482100006
PM 20945482
ER
PT J
AU Ritchie, RO
Koester, KJ
Ionova, S
Yao, W
Lane, NE
Ager, JW
AF Ritchie, R. O.
Koester, K. J.
Ionova, S.
Yao, W.
Lane, N. E.
Ager, J. W., III
TI Measurement of the toughness of bone: A tutorial with special reference
to small animal studies (vol 43, pg 798, 2008)
SO BONE
LA English
DT Correction
C1 [Ritchie, R. O.; Koester, K. J.; Ionova, S.] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
[Ritchie, R. O.; Koester, K. J.; Ionova, S.; Ager, J. W., III] Lawrence Berkley Natl Lab, Div Mat Sci, Berkeley, CA USA.
[Yao, W.; Lane, N. E.] UC Davis Med Ctr, Dept Med, Ctr Aging, Sacramento, CA USA.
RP Ritchie, RO (reprint author), Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
EM roritchie@lbl.gov
RI Ritchie, Robert/A-8066-2008
OI Ritchie, Robert/0000-0002-0501-6998
NR 2
TC 0
Z9 0
U1 0
U2 9
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 8756-3282
J9 BONE
JI Bone
PD SEP
PY 2010
VL 47
IS 3
BP 706
EP 706
DI 10.1016/j.bone.2010.06.012
PG 1
WC Endocrinology & Metabolism
SC Endocrinology & Metabolism
GA 645MO
UT WOS:000281464200033
ER
PT J
AU Gottschalck, J
Wheeler, M
Weickmann, K
Vitart, F
Savage, N
Lin, H
Hendon, H
Waliser, D
Sperber, K
Nakagawa, M
Prestrelo, C
Flatau, M
Higgins, W
AF Gottschalck, J.
Wheeler, M.
Weickmann, K.
Vitart, F.
Savage, N.
Lin, H.
Hendon, H.
Waliser, D.
Sperber, K.
Nakagawa, M.
Prestrelo, C.
Flatau, M.
Higgins, W.
TI A FRAMEWORK FOR ASSESSING OPERATIONAL MADDEN-JULIAN OSCILLATION
FORECASTS A CLIVAR MJO Working Group Project
SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
LA English
DT Article
ID TROPICAL INTRASEASONAL OSCILLATION; EXTREME PRECIPITATION EVENTS;
ENSEMBLE PREDICTION SYSTEM; COUPLED EQUATORIAL WAVES;
AMERICAN-MONSOON-SYSTEM; 1997-98 EL-NINO; CIRCULATION ANOMALIES; SUMMER
MONSOON; SIMULATION DIAGNOSTICS; BREAK PHASES
C1 [Gottschalck, J.] NOAA NCEP Climate Predict Ctr, Camp Springs, MD 20746 USA.
[Wheeler, M.; Hendon, H.] Ctr Australian Weather & Climate Res, Melbourne, Vic, Australia.
[Weickmann, K.] NOAA Earth Syst Res Lab, Boulder, CO USA.
[Vitart, F.] European Ctr Medium Range Weather Forecasts, Reading RG2 9AX, Berks, England.
[Savage, N.] Met Off, Exeter, Devon, England.
[Lin, H.] Environm Canada, Montreal, PQ, Canada.
[Waliser, D.] NASA, Jet Prop Lab, Pasadena, CA USA.
[Sperber, K.] Lawrence Livermore Natl Lab, Dept Energy, Livermore, CA USA.
[Nakagawa, M.] Japan Meteorol Agcy, Tokyo, Japan.
[Flatau, M.] USN, Res Lab, Monterey, CA USA.
[Prestrelo, C.] Ctr Weather Forecasting & Climate Studies, Sao Paulo, Brazil.
RP Gottschalck, J (reprint author), NOAA NCEP Climate Predict Ctr, 5200 Auth Rd, Camp Springs, MD 20746 USA.
EM jon.gottschalck@noaa.gov
RI Wheeler, Matthew/C-9038-2011; Prestrelo, Cristiano/I-5139-2015; Sperber,
Kenneth/H-2333-2012;
OI Wheeler, Matthew/0000-0002-9769-1973; Savage,
Nicholas/0000-0001-9391-5100; Lin, Hai/0000-0003-4353-0426
FU U.S. CLIVAR, International CLIVAR; U.S. CLIVAR Office; U. S. Department
of Energy, Office of Science [DE-AC52-07NA27344]
FX The authors would like to thank the entire MJOWG (in alphabetical
order)-Maria Flatau, Jon Gottschalck, Harry Hendon, Wayne Higgins,
In-Sik Kang, Daehyun Kim, Hai Lin, Eric Maloney, Mitch Moncrief, Kathy
Pegion, Nicholas Savage, Siegfried Schubert, Ken Sperber (cochair), Bill
Stern, Augustin Vintzileos, Frederic Vitart, Duane Waliser (cochair),
Bin Wang, Wanqui Wang, Klaus Weickmann, Matt Wheeler, and Chidong Zhang.
The MJOWG wishes to acknowledge and thank U.S. CLIVAR, International
CLIVAR, and the U.S. CLIVAR Office (specifically David Legler and Cathy
Stephens) for supporting this working group and its activities. JG
wishes to acknowledge and thank Kyong-Hwan Seo and Qin Zhang from Pusan
National University Korea and NOAA/CPC respectively for their
contributions to code development. KS was supported under the auspices
of the U. S. Department of Energy, Office of Science, Climate Change
Prediction Program by Lawrence Livermore National Laboratory under
Contract DE-AC52-07NA27344. DW's contribution to this study was carried
out on behalf of the Jet Propulsion Laboratory, California Institute of
Technology, under a contract with the National Aeronautics and Space
Administration.
NR 71
TC 86
Z9 86
U1 0
U2 12
PU AMER METEOROLOGICAL SOC
PI BOSTON
PA 45 BEACON ST, BOSTON, MA 02108-3693 USA
SN 0003-0007
EI 1520-0477
J9 B AM METEOROL SOC
JI Bull. Amer. Meteorol. Soc.
PD SEP
PY 2010
VL 91
IS 9
BP 1247
EP 1258
DI 10.1175/2010BAMS2816.1
PG 12
WC Meteorology & Atmospheric Sciences
SC Meteorology & Atmospheric Sciences
GA 660XC
UT WOS:000282678800006
ER
PT J
AU Hu, RX
Gao, MC
Dogan, ON
King, P
Widom, M
AF Hu, Rongxiang
Gao, Michael C.
Dogan, Oemer N.
King, Paul
Widom, Michael
TI Thermodynamic modeling of the Pd-S system supported by first-principles
calculations
SO CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
LA English
DT Article
DE CALPHAD; Pd-S; Phase diagram; Sulfur poisoning; Hydrogen separation
ID GENERALIZED GRADIENT APPROXIMATION; CRYSTAL-STRUCTURE; HYDROGEN-SULFIDE;
CU MEMBRANES; PALLADIUM; SULFUR; ENERGETICS; STABILITY; LATTICE; METALS
AB Sulfur poisoning of PdCu membrane alloys has promoted new alloy development that requires quantitative understanding of the thermodynamics of the Pd-Cu-S system. This study attempts to develop a self-consistent thermodynamic description of the Pd-rich Pd-S binary system using the CALPHAD approach, based on available phase equilibrium information and thermochemistry data. The optimized phase diagram and enthalpies of formation agree well with the experimental values and first-principles calculations. The phase stability of this system is further investigated using first-principles calculations, confirming that the five intermetallic compounds reported are stable phases. The present density functional theory (DFT) calculations using various exchange-correlation functionals, pseudo-potentials and settings demonstrate that using the PBEsol functional reproduces the experimental enthalpies and phase stability of S, Pd and Pd-S compounds acceptably, and is able to reproduce the lattice parameters nearly perfectly. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Hu, Rongxiang; Gao, Michael C.; Dogan, Oemer N.; King, Paul] Natl Energy Technol Lab, Albany, OR 97321 USA.
[Hu, Rongxiang] Oak Ridge Inst Sci & Educ, Oak Ridge, TN 37831 USA.
[Gao, Michael C.] URS, Albany, OR 97321 USA.
[Widom, Michael] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA.
RP Gao, MC (reprint author), Natl Energy Technol Lab, 1450 Queen Ave SW, Albany, OR 97321 USA.
EM michael.gao@netl.doe.gov
RI Widom, Michael/P-2531-2014
OI Widom, Michael/0000-0001-5972-5696
FU NETL's Strategic Center for Coal; Pittsburgh Supercomputing Center
[DMR080005]
FX This research was performed with the support of the Syngas and Hydrogen
Program of the NETL's Strategic Center for Coal. This research was
supported in part by an appointment (of R.H.) to the US Department of
Energy (DOE) Postgraduate Research Program at the NETL administrated by
the Oak Ridge Institute for Science and Education. Computational time
was partially supported by Pittsburgh Supercomputing Center with Grant
No. DMR080005.
NR 57
TC 6
Z9 6
U1 1
U2 15
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0364-5916
J9 CALPHAD
JI Calphad-Comput. Coupling Ph. Diagrams Thermochem.
PD SEP
PY 2010
VL 34
IS 3
BP 324
EP 331
DI 10.1016/j.calphad.2010.07.002
PG 8
WC Thermodynamics; Chemistry, Physical; Materials Science,
Multidisciplinary; Metallurgy & Metallurgical Engineering
SC Thermodynamics; Chemistry; Materials Science; Metallurgy & Metallurgical
Engineering
GA 663CE
UT WOS:000282859800010
ER
PT J
AU Patton, KM
Almes, KM
de Lahunta, A
AF Patton, Kristin M.
Almes, Kelli M.
de Lahunta, Alexander
TI Absence of the dens in a 9.5-year-old rottweiler with non-progressive
clinical signs
SO CANADIAN VETERINARY JOURNAL-REVUE VETERINAIRE CANADIENNE
LA English
DT Article
ID ATLANTO-AXIAL MALFORMATION; SURGICAL-TREATMENT; SUBLUXATION; DOG
AB Absence of the dens is rarely described in large breed dogs. In this rottweiler, mild neurological deficits seen at 6 mo of age did not progress for the 9.5 y of the dog's life despite lack of surgical intervention. This finding underscores the marked differences between small and large breeds.
C1 [Patton, Kristin M.] Oregon State Univ, Coll Vet Med, Dept Biomed Sci, Corvallis, OR 97331 USA.
[Almes, Kelli M.] Kansas State Univ, Coll Vet Med, Dept Diagnost Med Pathobiol, Manhattan, KS 66506 USA.
RP Patton, KM (reprint author), Battelle Toxicol NW, 900 Battelle Blvd, Richland, WA 99354 USA.
EM pattonk@battelle.org
NR 16
TC 2
Z9 2
U1 1
U2 1
PU CANADIAN VET MED ASSOC
PI OTTAWA
PA 339 BOOTH ST ATTN: KIMBERLY ALLEN-MCGILL, OTTAWA, ONTARIO K1R 7K1,
CANADA
SN 0008-5286
J9 CAN VET J
JI Can. Vet. J.-Rev. Vet. Can.
PD SEP
PY 2010
VL 51
IS 9
BP 1007
EP 1010
PG 4
WC Veterinary Sciences
SC Veterinary Sciences
GA 650CO
UT WOS:000281825900010
PM 21119869
ER
PT J
AU Vukovic, GD
Tomic, SZ
Marinkovic, AD
Radmilovic, V
Uskokovic, PS
Colic, M
AF Vukovic, Goran D.
Tomic, Sergej Z.
Marinkovic, Aleksandar D.
Radmilovic, Velimir
Uskokovic, Petar S.
Colic, Miodrag
TI The response of peritoneal macrophages to dapsone covalently attached on
the surface of carbon nanotubes
SO CARBON
LA English
DT Article
ID MYCOBACTERIUM-TUBERCULOSIS; CELLS; APOPTOSIS; INFECTIONS; DELIVERY;
OXIDE; FUNCTIONALIZATION; BIOCOMPATIBILITY; NANOMATERIALS; ANTIOXIDANT
AB Dapsone is an anti-microbial and anti-inflammatory drug. Water-dispersible dapsone-modified multi-wall carbon nanotubes (dap-MWCNTs) were prepared by chemical modification of the carboxyl groups introduced on the surface of the nanotubes using O-(7-aza-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate (N-HATU) and N,N-diisopropylethylamine (DIEA). The modification was confirmed by Fourier-transform infrared spectroscopy, transmission election microscopy and thermogravimetric analysis. The biological effect of dap-MWCNTs was tested using rat peritoneal macrophages (PMempty set). By confocal laser microscopy and flow cytometry, it was shown that the dap-MWCNTs were rapidly ingested by PMempty set as were the control, oxidized o-MWCNTs. Neither dap-MWCNTs at lower concentrations (up to 50 mu g/ml), nor o-MWCNTs, at equivalent concentrations, respectively affected the viability of PMempty set, while higher concentrations triggered apoptosis. Apoptosis of PMempty set induced by the control, o-MWCNTs, was higher than that induced by dap-MWCNTs and it correlated with the induction of oxidative stress. In contrast, dap-MWCNTs did not trigger oxidative stress but caused apoptosis of PMempty set predominantly after prolonged cultivation (3 days). Although equivalent concentrations of soluble dapsone induced oxidative stress, they were anti-apoptotic. Cumulatively, the obtained results show the complexity of dap-MWCNT/PMempty set interactions and suggest that this complex could be investigated for the treatment of dapsone-sensitive intracellular microorganisms or inflammatory diseases responding to dapsone therapy. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Tomic, Sergej Z.; Colic, Miodrag] Mil Med Acad, Inst Med Res, Belgrade 11002, Serbia.
[Vukovic, Goran D.; Marinkovic, Aleksandar D.; Uskokovic, Petar S.] Univ Belgrade, Fac Technol & Met, Belgrade 11120, Serbia.
[Radmilovic, Velimir] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA.
RP Colic, M (reprint author), Mil Med Acad, Inst Med Res, Crnotravska 17, Belgrade 11002, Serbia.
EM vmaimi@eunet.rs
OI Tomic, Sergej/0000-0003-2570-1295
FU Ministry of Science and Technological Development of The Republic of
Serbia [142006]; Millitary Medical Academy, Belgrade Serbia
[VMA/06-10/A5]; US Department of Energy [DE-ACO2-05CH11231]
FX This work was financially supported by The Ministry of Science and
Technological Development of The Republic of Serbia, Contract No. 142006
and by a Grant of The Millitary Medical Academy, Belgrade Serbia, No.
VMA/06-10/A5. Electron microscopy characterization of MWCNTs was
performed at the National Centre 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 US Department of Energy under Contract No.
DE-ACO2-05CH11231. The authors gratefully thank to Professor Vojin Savic
from the Institute for Biomedical Research, Medical Faculty University
of Nis, Serbia for electron microscopy characterization of PMempty set.
NR 46
TC 22
Z9 23
U1 0
U2 9
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0008-6223
J9 CARBON
JI Carbon
PD SEP
PY 2010
VL 48
IS 11
BP 3066
EP 3078
DI 10.1016/j.carbon.2010.04.043
PG 13
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 626RM
UT WOS:000279984600008
ER
PT J
AU Pappano, PJ
Burchell, TD
AF Pappano, Peter J.
Burchell, Timothy D.
TI Preliminary data on processing and characterization of recycled
irradiated graphite
SO CARBON
LA English
DT Article
AB Neutron irradiated graphite was recycled as the "filler" material in reconstituted graphite. The work, performed in a radiological facility at the Oak Ridge National Laboratory, is believed to be the first ever demonstration of the feasibility of recycling irradiated graphite. The recycled graphite was lower in selected properties than commercially available nuclear graphite, but it is believed that similar property values could have been achieved with an impregnation step and a refined particle size distribution. The irradiation temperature and fluence of the graphites that were recycled had no discernable impact on the properties of the graphites made from them. Published by Elsevier Ltd.
C1 [Pappano, Peter J.; Burchell, Timothy D.] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA.
RP Burchell, TD (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA.
EM burchelltd@ornl.gov
RI Burchell, Tim/E-6566-2017
OI Burchell, Tim/0000-0003-1436-1192
FU US Department of Energy, Office of Nuclear Energy Science and Technology
[DE-AC05-00OR22725, AC05-00OR22725]
FX This work was carried out for the Deep Burn Project of the US Department
of Energy, Office of Nuclear Energy Science and Technology under
contract DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed
by UT-Battelle, LLC. Use of the High Flux Isotope Reactor at the Oak
Ridge National Laboratory was supported by the US Department of Energy.
This manuscript has been authored by UT-Battelle, LLC, under Contract
No. DE-AC05-00OR22725 with the US Department of Energy. The authors wish
to acknowledge the assistance of Marie Williams, Ashli Clark and Kazumi
Ozawa with the physical property determinations.
NR 2
TC 4
Z9 4
U1 0
U2 3
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0008-6223
J9 CARBON
JI Carbon
PD SEP
PY 2010
VL 48
IS 11
BP 3303
EP 3305
DI 10.1016/j.carbon.2010.05.012
PG 3
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 626RM
UT WOS:000279984600038
ER
PT J
AU Dar, RD
Karig, DK
Cooke, JF
Cox, CD
Simpson, ML
AF Dar, R. D.
Karig, D. K.
Cooke, J. F.
Cox, C. D.
Simpson, M. L.
TI Distribution and regulation of stochasticity and plasticity in
Saccharomyces cerevisiae
SO CHAOS
LA English
DT Article
DE cellular biophysics; fluctuations; genetics; microorganisms; molecular
biophysics; stochastic processes
ID EUKARYOTIC GENE-EXPRESSION; SINGLE-CELL; FLUCTUATING ENVIRONMENTS;
TRANSCRIPTIONAL REGULATION; TATA BOX; NOISE; YEAST; NETWORKS; PROMOTER;
IDENTIFICATION
AB Stochasticity is an inherent feature of complex systems with nanoscale structure. In such systems information is represented by small collections of elements (e.g., a few electrons on a quantum dot), and small variations in the populations of these elements may lead to big uncertainties in the information. Unfortunately, little is known about how to work within this inherently noisy environment to design robust functionality into complex nanoscale systems. Here, we look to the biological cell as an intriguing model system where evolution has mediated the trade-offs between fluctuations and function, and in particular we look at the relationships and trade-offs between stochastic and deterministic responses in the gene expression of budding yeast (Saccharomyces cerevisiae). We find gene regulatory arrangements that control the stochastic and deterministic components of expression, and show that genes that have evolved to respond to stimuli (stress) in the most strongly deterministic way exhibit the most noise in the absence of the stimuli. We show that this relationship is consistent with a bursty two-state model of gene expression, and demonstrate that this regulatory motif generates the most uncertainty in gene expression when there is the greatest uncertainty in the optimal level of gene expression. (C) 2010 American Institute of Physics. [doi:10.1063/1.3486800]
C1 [Dar, R. D.; Karig, D. K.; Simpson, M. L.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
[Dar, R. D.; Cooke, J. F.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA.
[Cox, C. D.] Univ Tennessee, Dept Civil & Environm Engn, Knoxville, TN 37996 USA.
[Cox, C. D.; Simpson, M. L.] Univ Tennessee, Ctr Environm Biotechnol, Knoxville, TN 37996 USA.
[Simpson, M. L.] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
RP Simpson, ML (reprint author), Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Bethel Valley Rd, Oak Ridge, TN 37831 USA.
EM simpsonml1@ornl.gov
RI Simpson, Michael/A-8410-2011; Karig, David/G-5703-2011; Cox,
Chris/A-9451-2013
OI Simpson, Michael/0000-0002-3933-3457; Karig, David/0000-0002-9508-6411;
Cox, Chris/0000-0001-9818-5477
FU Scientific User Facilities Division, U.S. Department of Energy
FX We gratefully acknowledge fruitful discussions with our colleagues L. S.
Weinberger, J. M. McCollum, and G. S. Sayler. This research was
supported by the in-house research program of the Center for Nanophase
Materials Sciences, which is sponsored at Oak Ridge National Laboratory
by the Scientific User Facilities Division, U.S. Department of Energy.
NR 42
TC 5
Z9 5
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 1054-1500
J9 CHAOS
JI Chaos
PD SEP
PY 2010
VL 20
IS 3
AR 037106
DI 10.1063/1.3486800
PG 8
WC Mathematics, Applied; Physics, Mathematical
SC Mathematics; Physics
GA 657TY
UT WOS:000282438500032
PM 20887072
ER
PT J
AU Tsouris, C
Aaron, D
AF Tsouris, Costas
Aaron, Douglas
TI Do we really need carbon capture and storage?
SO CHEMISTRY WORLD
LA English
DT Editorial Material
C1 [Tsouris, Costas] Oak Ridge Natl Lab, Oak Ridge, TN USA.
Georgia Inst Technol, Atlanta, GA 30332 USA.
RP Tsouris, C (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA.
RI Tsouris, Costas/C-2544-2016
OI Tsouris, Costas/0000-0002-0522-1027
NR 4
TC 1
Z9 1
U1 0
U2 4
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1473-7604
J9 CHEM WORLD-UK
JI Chem. World
PD SEP
PY 2010
VL 7
IS 9
BP 40
EP 40
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 653GO
UT WOS:000282077400038
ER
PT J
AU Zhai, MY
Kuzuma, H
Rector, JW
AF Zhai Ming-Yue
Kuzuma, Heidi
Rector, James W.
TI A new fractal algorithm to model discrete sequences
SO CHINESE PHYSICS B
LA English
DT Article
DE fractal interpolation; the vertical scaling factors; iterative function
system; seismic data
ID ITERATED FUNCTION SYSTEMS; INTERPOLATION FUNCTIONS; SELF-SIMILARITY;
RECONSTRUCTION; SPLINES; SIGNALS
AB Employing the properties of the affine mappings, a very novel fractal model scheme based on the iterative function system is proposed. We obtain the vertical scaling factors by a set of the middle points in each affine transform, solving the difficulty in determining the vertical scaling factors, one of the most difficult challenges faced by the fractal interpolation. The proposed method is carried out by interpolating the known attractor and the real discrete sequences from seismic data. The results show that a great accuracy in reconstruction of the known attractor and seismic profile is found, leading to a significant improvement over other fractal interpolation schemes.
C1 [Zhai Ming-Yue] N China Elect Power Univ, Sch EE Engn, Beijing 102206, Peoples R China.
[Kuzuma, Heidi; Rector, James W.] Univ Calif Berkeley, Dept Civil Engn, Berkeley, CA 94530 USA.
[Rector, James W.] Lawrence Berkeley Lab, Berkeley, CA 94530 USA.
RP Zhai, MY (reprint author), N China Elect Power Univ, Sch EE Engn, Beijing 102206, Peoples R China.
EM mingyue.zhai@gmail.com
OI zhai, ming-yue/0000-0003-3425-6111
FU National Natural Science Foundation of China [60972004, 60402004]
FX Project supported by the National Natural Science Foundation of China
(Grant Nos. 60972004 and 60402004).
NR 17
TC 2
Z9 2
U1 0
U2 3
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 1674-1056
J9 CHINESE PHYS B
JI Chin. Phys. B
PD SEP
PY 2010
VL 19
IS 9
AR 090509
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 654RT
UT WOS:000282186400044
ER
PT J
AU Jackson, HE
AF Jackson, H. E.
CA HERMES Collaboration
TI Recent results from the HERMES experiment
SO CHINESE PHYSICS C
LA English
DT Article; Proceedings Paper
CT 5th International Conference on Quarks and Nuclear Physics (QNP09)
CY SEP 21-25, 2009
CL Inst High Energy Phys Chinese Acad Sci, Beijing, PEOPLES R CHINA
HO Inst High Energy Phys Chinese Acad Sci
DE lepton-nucleon scattering; spin asymmetries; strange quarks; parton
distributions
AB Results are presented from the HERMES experiment which uses semi-inclusive deep inelastic lepton scattering to study the flavor structure of the nucleon Data have been accumulated for pion and kaon double spin asymmetries, single-spin azimuthal asymmetries for meson electroproduction, deep virtual Compton scattering (DVCS); and meson multiplicities These results provide information on the properties of the strange sea in the proton; constraints on transverse momentum dependent quark parton distributions; and demonstrate the promise of DVCS for isolating the total angular momentum carried by the quarks in the proton
C1 [Jackson, H. E.; HERMES Collaboration] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
RP Jackson, HE (reprint author), Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA.
NR 17
TC 0
Z9 0
U1 0
U2 1
PU CHINESE PHYSICAL SOC
PI BEIJING
PA P O BOX 603, BEIJING 100080, PEOPLES R CHINA
SN 1674-1137
J9 CHINESE PHYS C
JI Chin. Phys. C
PD SEP
PY 2010
VL 34
IS 9
BP 1247
EP 1253
PG 7
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 646KW
UT WOS:000281540100019
ER
PT J
AU Richards, DG
AF Richards, D. G.
TI Latest lattice results for baryon spectroscopy
SO CHINESE PHYSICS C
LA English
DT Article; Proceedings Paper
CT 5th International Conference on Quarks and Nuclear Physics (QNP09)
CY SEP 21-25, 2009
CL Inst High Energy Phys Chinese Acad Sci, Beijing, PEOPLES R CHINA
HO Inst High Energy Phys Chinese Acad Sci
DE Lattice QCD; spectroscopy; hadronic physics
ID GAUGE-THEORY; RESONANCE; QCD
AB Theoretical and computational advances have enabled not only the masses of the ground states, but also some of the low-lying excited states to be calculated using Lattice Gauge Theory In this talk, I look at recent progress aimed at understanding the spectrum of baryon excited states, including both baryons composed of the light u and d quarks, and of the heavier quarks I then describe recent work aimed at understanding the radiative transitions between baryons, and in particular the N-Roper transition I conclude with the prospects for future calculations
C1 Jefferson Lab, Newport News, VA 23606 USA.
RP Richards, DG (reprint author), Jefferson Lab, 12000 Jefferson Ave,Suite 1, Newport News, VA 23606 USA.
NR 23
TC 0
Z9 0
U1 0
U2 0
PU CHINESE PHYSICAL SOC
PI BEIJING
PA P O BOX 603, BEIJING 100080, PEOPLES R CHINA
SN 1674-1137
J9 CHINESE PHYS C
JI Chin. Phys. C
PD SEP
PY 2010
VL 34
IS 9
BP 1281
EP 1285
PG 5
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 646KW
UT WOS:000281540100025
ER
PT J
AU Wang, F
Chen, XS
Lu, XF
Sun, WM
Goldman, T
AF Wang Fan
Chen Xiang-Song
Lu Xiao-Fu
Sun Wei-Min
Goldman, T.
TI Gauge invariance and quantization applied to atom and nucleon internal
structure
SO CHINESE PHYSICS C
LA English
DT Article; Proceedings Paper
CT 5th International Conference on Quarks and Nuclear Physics (QNP09)
CY SEP 21-25, 2009
CL Inst High Energy Phys Chinese Acad Sci, Beijing, PEOPLES R CHINA
HO Inst High Energy Phys Chinese Acad Sci
DE nucleon internal structure; quark-gluon momentum and angular momentum;
canonical commutation relation; gauge invariance
ID SPIN
AB The prevailing theoretical quark and gluon momentum, orbital angular momentum and spin operators, satisfy either gauge invariance or the corresponding canonical commutation relation, but one never has these operators which satisfy both except the quark spin The conflicts between gauge invariance and the canonical quantization requirement, of these operators are discussed A new set of quark and gluon momentum, orbital angular momentum and spin operators, which satisfy both gauge invariance and canonical momentum and angular momentum commutation relation, are proposed To achieve such a proper decomposition the key point is to separate the gauge field into the pure gauge and the gauge covariant parts The same conflicts also exist in QED and quantum mechanics, and have been solved in the same manner The impacts of this new decomposition to the nucleon internal structure are discussed
C1 [Wang Fan; Sun Wei-Min] Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China.
[Wang Fan; Sun Wei-Min] Chinese Acad Sci, Purple Mt Observ, Nanjing 210093, Peoples R China.
[Wang Fan; Sun Wei-Min] Nanjing Univ, Joint Inst Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China.
[Chen Xiang-Song; Lu Xiao-Fu] Sichuan Univ, Dept Phys, Chengdu 610064, Peoples R China.
[Goldman, T.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
RP Wang, F (reprint author), Nanjing Univ, Dept Phys, Nanjing 210093, Peoples R China.
NR 10
TC 0
Z9 0
U1 0
U2 2
PU CHINESE PHYSICAL SOC
PI BEIJING
PA P O BOX 603, BEIJING 100080, PEOPLES R CHINA
SN 1674-1137
J9 CHINESE PHYS C
JI Chin. Phys. C
PD SEP
PY 2010
VL 34
IS 9
BP 1312
EP 1319
PG 8
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 646KW
UT WOS:000281540100032
ER
PT J
AU Girlanda, L
Pastore, S
Schiavilla, R
Viviani, M
AF Girlanda, L.
Pastore, S.
Schiavilla, R.
Viviani, M.
TI Electromagnetic processes in a chi EFT framework
SO CHINESE PHYSICS C
LA English
DT Article; Proceedings Paper
CT 5th International Conference on Quarks and Nuclear Physics (QNP09)
CY SEP 21-25, 2009
CL Inst High Energy Phys Chinese Acad Sci, Beijing, PEOPLES R CHINA
HO Inst High Energy Phys Chinese Acad Sci
DE chiral effective field theory; nuclear electromagnetic currents
ID EFFECTIVE-FIELD THEORY; THERMAL-NEUTRON CAPTURE; FEW-NUCLEON SYSTEMS;
CROSS-SECTION; CURRENTS; FORCES; LAGRANGIANS; DEUTERIUM; DYNAMICS
AB Recently, we have derived a two nucleon potential and consistent nuclear electromagnetic currents in chiral effective field theory with pions and nucleons as explicit degrees of freedom The calculation of the currents has been carried out to include (NLO)-L-3 corrections, consisting of two-pion exchange and contact contributions The latter involve unknown low-energy constants (LECs), some of which have been fixed by fitting the up S- and P-wave phase shifts up to 100 MeV lab energies The remaining LECs entering the current operator are determined so as to reproduce the experimental deuteron and trinucleon magnetic moments, as well as the rip cross section This electromagnetic current operator is utilized to study the mid and n(3)He radiative captures at thermal neutron energies Here we discuss our results stressing on the important role played by the LECs in reproducing the experimental data
C1 [Girlanda, L.] Univ Pisa, Dept Phys, I-56127 Pisa, Italy.
[Girlanda, L.; Viviani, M.] Ist Nazl Fis Nucl, I-56127 Pisa, Italy.
[Pastore, S.; Schiavilla, R.] Old Dominion Univ, Dept Phys, Norfolk, VA 23529 USA.
[Schiavilla, R.] Jefferson Lab, Newport News, VA 23606 USA.
RP Girlanda, L (reprint author), Univ Pisa, Dept Phys, I-56127 Pisa, Italy.
OI Girlanda, Luca/0000-0002-5560-005X
NR 23
TC 0
Z9 0
U1 0
U2 0
PU CHINESE PHYSICAL SOC
PI BEIJING
PA P O BOX 603, BEIJING 100080, PEOPLES R CHINA
SN 1674-1137
J9 CHINESE PHYS C
JI Chin. Phys. C
PD SEP
PY 2010
VL 34
IS 9
BP 1368
EP 1371
PG 4
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 646KW
UT WOS:000281540100045
ER
PT J
AU Thomas, CE
AF Thomas, Christopher E.
CA Hadron Spectrum Collaboration
TI Exotic and excited-state meson spectroscopy and radiative transitions
from lattice QCD
SO CHINESE PHYSICS C
LA English
DT Article; Proceedings Paper
CT 5th International Conference on Quarks and Nuclear Physics (QNP09)
CY SEP 21-25, 2009
CL Inst High Energy Phys Chinese Acad Sci, Beijing, PEOPLES R CHINA
HO Inst High Energy Phys Chinese Acad Sci
DE lattice QCD; exotics; mesons; spectroscopy
AB We discuss recent progress in extracting the excited meson spectrum and radiative transition form factors from lattice QCD We mention results in the charmonium sector, including the first lattice QCD calculation of radiative transition rates involving excited charmonium states; highlighting results for high spin and exotic states We present recent results on a highly excited isovector meson spectrum from dynamical anisotropic lattices Using carefully constructed operators we show how the continuum spin of extracted states can be reliably identified and confidently extract excited states, states with exotic quantum numbers and states of high spin This spectrum includes the first spin-four state extracted from lattice QCD We conclude with some comments on future prospects
C1 [Thomas, Christopher E.; Hadron Spectrum Collaboration] Jefferson Lab, Newport News, VA 23606 USA.
RP Thomas, CE (reprint author), Jefferson Lab, 12000 Jefferson Ave,Suite 1, Newport News, VA 23606 USA.
NR 13
TC 2
Z9 2
U1 0
U2 0
PU CHINESE PHYSICAL SOC
PI BEIJING
PA P O BOX 603, BEIJING 100080, PEOPLES R CHINA
SN 1674-1137
J9 CHINESE PHYS C
JI Chin. Phys. C
PD SEP
PY 2010
VL 34
IS 9
BP 1512
EP 1515
PG 4
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 646KW
UT WOS:000281540100088
ER
PT J
AU Salathe, EP
Leung, LR
Qian, Y
Zhang, YX
AF Salathe, Eric P., Jr.
Leung, L. Ruby
Qian, Yun
Zhang, Yongxin
TI Regional climate model projections for the State of Washington
SO CLIMATIC CHANGE
LA English
DT Article
ID WESTERN UNITED-STATES; US PACIFIC-NORTHWEST; PART I; PRECIPITATION;
SIMULATIONS; SNOWPACK; HYDROCLIMATE; SENSITIVITY; RESOLUTION; CASCADES
AB Global climate models do not have sufficient spatial resolution to represent the atmospheric and land surface processes that determine the unique regional climate of the State of Washington. Regional climate models explicitly simulate the interactions between the large-scale weather patterns simulated by a global model and the local terrain. We have performed two 100-year regional climate simulations using the Weather Research and Forecasting (WRF) model developed at the National Center for Atmospheric Research (NCAR). One simulation is forced by the NCAR Community Climate System Model version 3 (CCSM3) and the second is forced by a simulation of the Max Plank Institute, Hamburg, global model (ECHAM5). The mesoscale simulations produce regional changes in snow cover, cloudiness, and circulation patterns associated with interactions between the large-scale climate change and the regional topography and land-water contrasts. These changes substantially alter the temperature and precipitation trends over the region relative to the global model result or statistical downscaling. To illustrate this effect, we analyze the changes from the current climate (1970-1999) to the mid twenty-first century (2030-2059). Changes in seasonal-mean temperature, precipitation, and snowpack are presented. Several climatological indices of extreme daily weather are also presented: precipitation intensity, fraction of precipitation occurring in extreme daily events, heat wave frequency, growing season length, and frequency of warm nights. Despite somewhat different changes in seasonal precipitation and temperature from the two regional simulations, consistent results for changes in snowpack and extreme precipitation are found in both simulations.
C1 [Salathe, Eric P., Jr.] Univ Washington, JISAO CSES Climate Impacts Grp, Seattle, WA 98195 USA.
[Leung, L. Ruby; Qian, Yun] Pacific NW Natl Lab, Atmospher Sci & Global Change Div, Richland, WA 99352 USA.
[Zhang, Yongxin] Natl Ctr Atmospher Res, Res Applicat Lab, Boulder, CO 80307 USA.
RP Salathe, EP (reprint author), Univ Washington, JISAO CSES Climate Impacts Grp, Seattle, WA 98195 USA.
EM salathe@washington.edu
RI qian, yun/E-1845-2011
FU Washington State Legislature; NOAA [NA17RJ1232]; EPA [RD-R833369];
National Science Foundation [ATM0709856]
FX This publication is part of the Washington Climate Change Impacts
Assessment, funded by the 2007 Washington State Legislature through
House Bill 1303. This publication is partially funded by the NOAA
Regional Integrated Sciences and Assessments program and the NOAA
Climate Dynamics and Experimental Prediction/Applied Research Centers
program under NOAA Cooperative Agreement No. NA17RJ1232 to the Joint
Institute for the Study of the Atmosphere and Ocean (JISAO). This is
JISAO Contribution no. 1787. This work was funded in part by an EPA
Science to Achieve Results (STAR) Program (Agreement Number: RD-R833369,
EPA has not officially endorsed this publication and the views expressed
herein may not reflect the views of the EPA) and by the National Science
Foundation (ATM0709856). Computing resources for the WRF simulations
were provided by the National Center for Computational Sciences (NCCS)
at Oak Ridge National Laboratory through the Climate-Science
Computational End Station Development and Grand Challenge Team. PNNL is
operated for the US DOE by Battelle Memorial Institute under Contract
DE-AC06-76RLO1830.
NR 33
TC 66
Z9 69
U1 1
U2 33
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0165-0009
EI 1573-1480
J9 CLIMATIC CHANGE
JI Clim. Change
PD SEP
PY 2010
VL 102
IS 1-2
BP 51
EP 75
DI 10.1007/s10584-010-9849-y
PG 25
WC Environmental Sciences; Meteorology & Atmospheric Sciences
SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
GA 652CL
UT WOS:000281978500004
ER
PT J
AU Vano, JA
Scott, MJ
Voisin, N
Stockle, CO
Hamlet, AF
Mickelson, KEB
Elsner, MM
Lettenmaier, DP
AF Vano, Julie A.
Scott, Michael J.
Voisin, Nathalie
Stoeckle, Claudio O.
Hamlet, Alan F.
Mickelson, Kristian E. B.
Elsner, Marketa McGuire
Lettenmaier, Dennis P.
TI Climate change impacts on water management and irrigated agriculture in
the Yakima River Basin, Washington, USA
SO CLIMATIC CHANGE
LA English
DT Article
ID SNOWPACK; MODEL
AB The Yakima River Reservoir system supplies water to similar to 180,000 irrigated hectares through the operation of five reservoirs with cumulative storage of similar to 30% mean annual river flow. Runoff is derived mostly from winter precipitation in the Cascade Mountains, much of which is stored as snowpack. Climate change is expected to result in earlier snowmelt runoff and reduced summer flows. Effects of these changes on irrigated agriculture were simulated using a reservoir system model coupled to a hydrological model driven by downscaled scenarios from 20 climate models archived by the 2007 Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report. We find earlier snowmelt results in increased water delivery curtailments. Historically, the basin experienced substantial water shortages in 14% of years. Without adaptations, for IPCC A1B global emission scenarios, water shortages increase to 27% (13% to 49% range) in the 2020s, to 33% in the 2040s, and 68% in the 2080s. For IPCC B1 emissions scenarios, shortages occur in 24% (7% to 54%) of years in the 2020s, 31% in the 2040s and 43% in the 2080s. Historically unprecedented conditions where senior water rights holders suffer shortfalls occur with increasing frequency in both A1B and B1 scenarios. Economic losses include expected annual production declines of 5%-16%, with greater probabilities of operating losses for junior water rights holders.
C1 [Vano, Julie A.; Voisin, Nathalie; Hamlet, Alan F.; Mickelson, Kristian E. B.; Lettenmaier, Dennis P.] Univ Washington, Dept Civil & Environm Engn, Seattle, WA 98195 USA.
[Scott, Michael J.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Stoeckle, Claudio O.] Washington State Univ, Dept Biol Syst Engn, Pullman, WA 99164 USA.
[Hamlet, Alan F.; Elsner, Marketa McGuire; Lettenmaier, Dennis P.] Univ Washington, JISAO CSES Climate Impacts Grp, Seattle, WA 98195 USA.
[Mickelson, Kristian E. B.] USA, Corps Engineers Seattle Dist, Seattle, WA 98134 USA.
RP Vano, JA (reprint author), Univ Washington, Dept Civil & Environm Engn, Box 352700, Seattle, WA 98195 USA.
EM jvano@u.washington.edu
RI lettenmaier, dennis/F-8780-2011; Voisin, Nathalie/D-8845-2014;
OI lettenmaier, dennis/0000-0003-3317-1327; Voisin,
Nathalie/0000-0002-6848-449X
FU Washington State Legislature; NOAA [NA17RJ1232]
FX The authors thank Chris Lynch at the USBR for his insights into system
operating procedures for the USBR Yakima Project and Lance Vail and
Andre Coleman at Pacific Northwest National Laboratory for their
assistance with the water management model simulations. Five anonymous
reviewers also provided helpful feedback on earlier drafts of this
paper. This publication is part of the Washington Climate Change Impacts
Assessment, funded by the 2007 Washington State Legislature through
House Bill 1303. This publication is partially funded by the NOAA
Regional Integrated Sciences and Assessments program and the NOAA
Climate Dynamics and Experimental Prediction/Applied Research Centers
program under NOAA Cooperative Agreement No. NA17RJ1232 to the Joint
Institute for the Study of the Atmosphere and Ocean (JISAO). This is
JISAO Contribution # 1790.
NR 32
TC 39
Z9 40
U1 2
U2 40
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0165-0009
J9 CLIMATIC CHANGE
JI Clim. Change
PD SEP
PY 2010
VL 102
IS 1-2
BP 287
EP 317
DI 10.1007/s10584-010-9856-z
PG 31
WC Environmental Sciences; Meteorology & Atmospheric Sciences
SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
GA 652CL
UT WOS:000281978500012
ER
PT J
AU Abbasi, H
Wolf, M
Eisenhauer, G
Klasky, S
Schwan, K
Zheng, F
AF Abbasi, Hasan
Wolf, Matthew
Eisenhauer, Greg
Klasky, Scott
Schwan, Karsten
Zheng, Fang
TI DataStager: scalable data staging services for petascale applications
SO CLUSTER COMPUTING-THE JOURNAL OF NETWORKS SOFTWARE TOOLS AND
APPLICATIONS
LA English
DT Article
DE I/O; WARP; GTC; XT3; Datatap; XT4; Staging; Data services
AB Known challenges for petascale machines are that (1) the costs of I/O for high performance applications can be substantial, especially for output tasks like checkpointing, and (2) noise from I/O actions can inject undesirable delays into the runtimes of such codes on individual compute nodes. This paper introduces the flexible 'DataStager' framework for data staging and alternative services within that jointly address (1) and (2). Data staging services moving output data from compute nodes to staging or I/O nodes prior to storage are used to reduce I/O overheads on applications' total processing times, and explicit management of data staging offers reduced perturbation when extracting output data from a petascale machine's compute partition. Experimental evaluations of DataStager on the Cray XT machine at Oak Ridge National Laboratory establish both the necessity of intelligent data staging and the high performance of our approach, using the GTC fusion modeling code and benchmarks running on 1000+ processors.
C1 [Abbasi, Hasan; Wolf, Matthew; Eisenhauer, Greg; Schwan, Karsten; Zheng, Fang] Georgia Inst Technol, Coll Comp, Atlanta, GA 30332 USA.
[Klasky, Scott] Oak Ridge Natl Lab, Oak Ridge, TN USA.
RP Abbasi, H (reprint author), Georgia Inst Technol, Coll Comp, Atlanta, GA 30332 USA.
EM habbasi@cc.gatech.edu; mwolf@cc.gatech.edu; eisen@cc.gatech.edu;
klasky@ornl.gov; schwan@cc.gatech.edu; fzheng@cc.gatech.edu
NR 37
TC 19
Z9 20
U1 1
U2 13
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1386-7857
EI 1573-7543
J9 CLUSTER COMPUT
JI Cluster Comput.
PD SEP
PY 2010
VL 13
IS 3
BP 277
EP 290
DI 10.1007/s10586-010-0135-6
PG 14
WC Computer Science, Information Systems; Computer Science, Theory &
Methods
SC Computer Science
GA 634BC
UT WOS:000280552800004
ER
PT J
AU Raicu, I
Foster, I
Wilde, M
Zhang, Z
Iskra, K
Beckman, P
Zhao, Y
Szalay, A
Choudhary, A
Little, P
Moretti, C
Chaudhary, A
Thain, D
AF Raicu, Ioan
Foster, Ian
Wilde, Mike
Zhang, Zhao
Iskra, Kamil
Beckman, Peter
Zhao, Yong
Szalay, Alex
Choudhary, Alok
Little, Philip
Moretti, Christopher
Chaudhary, Amitabh
Thain, Douglas
TI Middleware support for many-task computing
SO CLUSTER COMPUTING-THE JOURNAL OF NETWORKS SOFTWARE TOOLS AND
APPLICATIONS
LA English
DT Article
DE Many-task computing; High-throughput; Computing; High-performance
computing; Petascale; Loosely-coupled applications; Data-intensive
distributed computing; Falkon; Swift
C1 [Raicu, Ioan; Choudhary, Alok] Northwestern Univ, Dept Elect Engn & Comp Sci, Evanston, IL 60208 USA.
[Foster, Ian; Wilde, Mike; Zhang, Zhao; Iskra, Kamil; Beckman, Peter] Univ Chicago, Chicago, IL 60637 USA.
[Foster, Ian; Wilde, Mike; Iskra, Kamil; Beckman, Peter] Argonne Natl Lab, Argonne, IL 60439 USA.
[Zhao, Yong] Microsoft Corp, Redmond, WA 98052 USA.
[Szalay, Alex] Johns Hopkins Univ, Baltimore, MD USA.
[Little, Philip; Moretti, Christopher; Chaudhary, Amitabh; Thain, Douglas] Univ Notre Dame, Notre Dame, IN 46556 USA.
RP Raicu, I (reprint author), Northwestern Univ, Dept Elect Engn & Comp Sci, Evanston, IL 60208 USA.
EM iraicu@eecs.northwestern.edu; foster@anl.gov; wilde@mcs.anl.gov;
zhaozhang@uchicago.edu; iskra@mcs.anl.gov; beckman@mcs.anl.gov;
yozha@microsoft.com; szalay@jhu.edu; achaudha@cse.nd.edu;
plittle1@nd.edu; cmoretti@cse.nd.edu; choudhar@eecs.northwestern.edu;
dthain@nd.edu
RI Choudhary, Alok/C-5486-2009; Thain, Douglas/I-4666-2014
OI Thain, Douglas/0000-0001-5218-1956
FU NASA Ames Research Center GSRP [NNA06CB89H]; Office of Advanced
Scientific Computing Research, Office of Science, U.S. Dept. of Energy
[DE-AC02-06CH11357]; National Science Foundation
FX This work was supported in part by the NASA Ames Research Center GSRP
Grant Number NNA06CB89H and by the Office of Advanced Scientific
Computing Research, Office of Science, U.S. Dept. of Energy, under
Contract DE-AC02-06CH11357. This research was also supported in part by
the National Science Foundation through TeraGrid resources provided by
UC/ANL.
NR 69
TC 10
Z9 10
U1 1
U2 11
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1386-7857
EI 1573-7543
J9 CLUSTER COMPUT
JI Cluster Comput.
PD SEP
PY 2010
VL 13
IS 3
BP 291
EP 314
DI 10.1007/s10586-010-0132-9
PG 24
WC Computer Science, Information Systems; Computer Science, Theory &
Methods
SC Computer Science
GA 634BC
UT WOS:000280552800005
ER
PT J
AU Pettway, JS
Schmidt, JH
Stagg, AK
AF Pettway, Jackie S.
Schmidt, Joseph H.
Stagg, Alan K.
TI Adaptive meshing in a mixed regime hydrologic simulation model
SO COMPUTATIONAL GEOSCIENCES
LA English
DT Article
DE Adaptive meshing; Parallel; Load balance; Hash tables
ID QUALITY LOCAL REFINEMENT; FREE-BOUNDARY PROBLEMS; GRID REFINEMENT;
POROUS-MEDIA; MESHES; ALGORITHM; BISECTION; FLOW; TRIANGULATIONS
AB Problems in hydrology frequently have moving fronts and dynamic driving mechanisms such as wells. Since the location of important features changes during a simulation, accurate modeling requires uniformly fine resolution or the ability to change resolution during the simulation. We will describe an algorithm for refinement and unrefinement of tetrahedral/triangular meshes that has been implemented in the adaptive hydrology (ADH) code. The codes including the refinement/unrefinement algorithms are implemented in parallel to accommodate problems with large run time and memory requirements. In this paper, we describe the parallel, adaptive grid algorithm used in ADH and show the resulting grids from some example problems.
C1 [Pettway, Jackie S.] Engn Res & Dev Ctr, Coastal & Hydraul Lab, Vicksburg, MS 39180 USA.
[Schmidt, Joseph H.] Los Alamos Natl Lab, Computat Anal & Simulat XCP 1, Los Alamos, NM 87545 USA.
[Stagg, Alan K.] Los Alamos Natl Lab, Computat Anal & Simulat XCP 4, Los Alamos, NM 87545 USA.
RP Pettway, JS (reprint author), Engn Res & Dev Ctr, Coastal & Hydraul Lab, Vicksburg, MS 39180 USA.
EM Jackie.S.Pettway@usace.army.mil; joe_schmidt@lanl.gov; stagg@lanl.gov
FU United States Army Corps of Engineers (USACE)
FX This work was funded by the United States Army Corps of Engineers
(USACE). Permission was granted by the Chief of Engineers, USACE to
publish this information. We would like to thank Lisa C. Roig, Charlie
Berger, and Jennifer Tate. The Los Alamos National Laboratory strongly
supports academic freedom and a researcher's right to publish;
therefore, the laboratory as an institution does not endorse the
viewpoint of a publication or guarantee its technical correctness.
NR 32
TC 2
Z9 2
U1 0
U2 4
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1420-0597
J9 COMPUTAT GEOSCI
JI Comput. Geosci.
PD SEP
PY 2010
VL 14
IS 4
BP 665
EP 674
DI 10.1007/s10596-010-9179-1
PG 10
WC Computer Science, Interdisciplinary Applications; Geosciences,
Multidisciplinary
SC Computer Science; Geology
GA 641XL
UT WOS:000281165800011
ER
PT J
AU Robinson, BA
Dash, ZV
Srinivasan, G
AF Robinson, Bruce A.
Dash, Zora V.
Srinivasan, Gowri
TI A particle tracking transport method for the simulation of resident and
flux-averaged concentration of solute plumes in groundwater models
SO COMPUTATIONAL GEOSCIENCES
LA English
DT Article
DE Particle tracking; Solute transport; Convolution; Groundwater
ID HETEROGENEOUS POROUS-MEDIA; RADIONUCLIDE TRANSPORT; CONTAMINANT
TRANSPORT; NUMERICAL-SIMULATION; FINITE-ELEMENTS; YUCCA MOUNTAIN; PATH
LINES; EFFICIENT; IMPLEMENTATION; CONTINUUM
AB A new numerical technique called the convolution-based particle tracking (CBPT) method is developed to simulate resident or flux-averaged solute concentrations in groundwater models. The method is valid for steady-state flow and linear transport processes such as sorption with a linear sorption isotherm and first-order decay. The CBPT method uses particle tracking to take advantage of the ability of particle-based approaches to maintain sharp fronts for advection-dominated transport problems common in groundwater modeling and because of the flexibility of the random walk method to simulate a wide range of possible forms of the dispersion tensor. Furthermore, the algorithm for carrying out the convolution and superposition calculation from particle tracking results is very efficient. We show that from a single particle tracking run, source term variability, sorption, and decay can all be simulated rapidly without rerunning the underlying transport model unless the flow field or dispersion parameters are changed. A series of verification simulations are presented to demonstrate the accuracy and efficiency of the CBPT method compared to more conventional particle tracking approaches.
C1 [Srinivasan, Gowri] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87544 USA.
[Robinson, Bruce A.; Dash, Zora V.] Los Alamos Natl Lab, Div Earth & Environm Sci, Los Alamos, NM 87544 USA.
RP Srinivasan, G (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87544 USA.
EM gowri@lanl.gov
RI Robinson, Bruce/F-6031-2010
NR 30
TC 12
Z9 12
U1 1
U2 7
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1420-0597
J9 COMPUTAT GEOSCI
JI Comput. Geosci.
PD SEP
PY 2010
VL 14
IS 4
BP 779
EP 792
DI 10.1007/s10596-010-9190-6
PG 14
WC Computer Science, Interdisciplinary Applications; Geosciences,
Multidisciplinary
SC Computer Science; Geology
GA 641XL
UT WOS:000281165800019
ER
PT J
AU Hao, SG
Wang, CZ
Li, MZ
Napolitano, RE
Mendelev, MI
Ho, KM
AF Hao, S. G.
Wang, C. Z.
Li, Maozhi
Napolitano, R. E.
Mendelev, M. I.
Ho, K. M.
TI Prediction of cooling rate dependent ordering in metallic glass
transition using a two-state model
SO COMPUTATIONAL MATERIALS SCIENCE
LA English
DT Article
DE Two-state model; Metallic glass transition; Local order; Cooling rate
ID LOCAL ATOMIC ARRANGEMENTS; POLYTETRAHEDRAL MATERIALS; SUPERCOOLED
LIQUIDS; ALLOYS
AB A two-state theoretical model is proposed to study the evolution of local order when a good metallic glass former is cooled down from the liquid state. We find that the development of order depends strongly on the cooling rate and that the ordered fraction converges to an upper limit at low cooling rates. We compare our model predictions with molecular dynamics (MD) simulation results for the Zr35.5Cu64.5 binary system, revealing good agreement for the fast cooling rates accessible through MD. The analytical model proposed here, however, can be extended to much lower rates which correspond to experimentally accessible processing routes. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Hao, S. G.; Wang, C. Z.; Li, Maozhi; Napolitano, R. E.; Mendelev, M. I.; Ho, K. M.] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA.
[Li, Maozhi] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China.
RP Hao, SG (reprint author), Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA.
EM sghao@ameslab.gov
RI 石, 源/D-5929-2012; ruc, phy/E-4170-2012
FU US Department; National Energy Research Supercomputing Centre (NERSC) in
Berkeley [DE-AC02-07CH11358]
FX Work at Ames Laboratory was supported by the US Department rates. of
Energy, Basic Energy Sciences, including a grant of computer time at the
National Energy Research Supercomputing Centre (NERSC) in Berkeley,
under Contract No. DE-AC02-07CH11358.
NR 24
TC 5
Z9 5
U1 3
U2 25
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0927-0256
J9 COMP MATER SCI
JI Comput. Mater. Sci.
PD SEP
PY 2010
VL 49
IS 3
BP 615
EP 618
DI 10.1016/j.commatsci.2010.06.002
PG 4
WC Materials Science, Multidisciplinary
SC Materials Science
GA 647LD
UT WOS:000281619100024
ER
PT J
AU Sheldon, FT
Vishik, C
AF Sheldon, Frederick T.
Vishik, Claire
TI MOVING TOWARD TRUSTWORTHY SYSTEMS: R&D ESSENTIALS
SO COMPUTER
LA English
DT Article
C1 [Sheldon, Frederick T.] Oak Ridge Natl Lab, Oak Ridge, TN USA.
[Vishik, Claire] Intel Corp, Santa Clara, CA 95051 USA.
RP Sheldon, FT (reprint author), Oak Ridge Natl Lab, Oak Ridge, TN USA.
EM sheldonft@ornl.gov; claire.vishik@intel.com
OI Sheldon, Frederick/0000-0003-1241-2750
FU US Government (USG) [DE-AC05-00OR22725]
FX The submitted manuscript was authored by a contractor of the US
Government (USG) under contract DE-AC05-00OR22725. Accordingly, the USG
retains a nonexclusive, royalty-free license to publish or reproduce the
published form of this contribution, or allow others to do so, for USG
purposes. The authors thank Susan Alexander, currently at ODNI, and
Tomas Vagoun from the National Coordination Office for NITRD.
NR 20
TC 5
Z9 5
U1 0
U2 0
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA
SN 0018-9162
J9 COMPUTER
JI Computer
PD SEP
PY 2010
VL 43
IS 9
BP 31
EP 40
PG 10
WC Computer Science, Hardware & Architecture; Computer Science, Software
Engineering
SC Computer Science
GA 648NY
UT WOS:000281702400013
ER
PT J
AU Tan, W
Zhang, J
Foster, I
AF Tan, Wei
Zhang, Jia
Foster, Ian
TI Network Analysis of Scientific Workflows: A Gateway to Reuse
SO COMPUTER
LA English
DT Article
C1 [Tan, Wei] Univ Chicago, Computat Inst, Chicago, IL 60637 USA.
[Tan, Wei; Foster, Ian] Argonne Natl Lab, Argonne, IL 60439 USA.
[Zhang, Jia] No Illinois Univ, Dept Comp Sci, De Kalb, IL 60115 USA.
[Foster, Ian] Univ Chicago, Dept Comp Sci, Chicago, IL 60637 USA.
RP Tan, W (reprint author), Univ Chicago, Computat Inst, Chicago, IL 60637 USA.
EM wtan@mcs.anl.gov; jiazhang@cs.niu.edu; foster@mcs.anl.gov
RI Tan, Wei/A-8144-2009
FU National Cancer Institute; National Institutes of Health [N01-CO-12400];
National Science Foundation [IIS-0959215]; National Cancer Institute,
the National Institutes of Health
FX We thank the caBIG (Cancer Biomedical Informatics Grid) community,
sponsored by the National Cancer Institute, for various application
scenarios motivating our network analysis and CASE framework. We thank
Carole Goble and David De Roure for supporting our assessment of
Taverna, myExperiment, and BioCatalogue. We also thank Ravi Madduri for
constructive discussions on workflow reuse in caBIG. The work described
in this article is partially supported by the National Cancer Institute,
the National Institutes of Health under contract N01-CO-12400, and the
National Science Foundation under grant IIS-0959215.
NR 9
TC 24
Z9 27
U1 0
U2 2
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA
SN 0018-9162
J9 COMPUTER
JI Computer
PD SEP
PY 2010
VL 43
IS 9
BP 54
EP 61
PG 8
WC Computer Science, Hardware & Architecture; Computer Science, Software
Engineering
SC Computer Science
GA 648NY
UT WOS:000281702400016
ER
PT J
AU Valiev, M
Bylaska, EJ
Govind, N
Kowalski, K
Straatsma, TP
Van Dam, HJJ
Wang, D
Nieplocha, J
Apra, E
Windus, TL
de Jong, W
AF Valiev, M.
Bylaska, E. J.
Govind, N.
Kowalski, K.
Straatsma, T. P.
Van Dam, H. J. J.
Wang, D.
Nieplocha, J.
Apra, E.
Windus, T. L.
de Jong, Wa.
TI NWChem: A comprehensive and scalable open-source solution for large
scale molecular simulations
SO COMPUTER PHYSICS COMMUNICATIONS
LA English
DT Article
DE NWChem; DFT; Coupled cluster; QMMM; Plane wave methods
ID DENSITY-FUNCTIONAL THEORY; COUPLED-CLUSTER METHODS; GENERALIZED GRADIENT
APPROXIMATION; EXCITED ELECTRONIC STATES; PLANE-WAVE METHOD; FULL CCSDT
MODEL; PARALLEL IMPLEMENTATION; EXCITATION-ENERGIES; QUANTUM-CHEMISTRY;
DOUBLES METHOD
AB The latest release of NWChem delivers an open-source computational chemistry package with extensive capabilities for large scale simulations of chemical and biological systems. Utilizing a common computational framework, diverse theoretical descriptions can be used to provide the best solution for a given scientific problem. Scalable parallel implementations and modular software design enable efficient utilization of current computational architectures. This paper provides an overview of NWChem focusing primarily on the core theoretical modules provided by the code and their parallel performance.
Program summary
Program title: NWChem
Catalogue identifier: AEGI_v1_0
Program summary URL: http://cpc.cs.qub.ac.uk/summaries/AEGI_v1_0.html
Program obtainable from: CPC Program Library, Queen's University, Belfast, N. Ireland
Licensing provisions: Open Source Educational Community License
No. of lines in distributed program, including test data, etc.: 11 709 543
No. of bytes in distributed program, including test data, etc.: 680 696 106
Distribution format: tar.gz
Programming language: Fortran 77, C
Computer: all Linux based workstations and parallel supercomputers. Windows and Apple machines
Operating system: Linux, OS X, Windows
Has the code been vectorised or parallelized?: Code is parallelized
Classification: 2.1, 2.2, 3, 7.3, 7.7, 16.1, 16.2, 16.3, 16.10, 16.13
Nature of problem: Large-scale atomistic simulations of chemical and biological systems require efficient and reliable methods for ground and excited solutions of many-electron Hamiltonian, analysis of the potential energy surface, and dynamics.
Solution method: Ground and excited solutions of many-electron Hamiltonian are obtained utilizing density-functional theory, many-body perturbation approach, and coupled cluster expansion. These solutions or a combination thereof with classical descriptions are then used to analyze potential energy surface and perform dynamical simulations.
Additional comments: Full documentation is provided in the distribution file. This includes an INSTALL file giving details of how to build the package. A set of test runs is provided in the examples directory. The distribution file for this program is over 90 Mbytes and therefore is not delivered directly when download or Email is requested. Instead a html file giving details of how the program can be obtained is sent.
Running time: Running time depends on the size of the chemical system, complexity of the method, number of cpu's and the computational task. It ranges from several seconds for serial OFT energy calculations on a few atoms to several hours for parallel coupled cluster energy calculations on tens of atoms or ab-initio molecular dynamics simulation on hundreds of atoms. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Valiev, M.; Bylaska, E. J.; Govind, N.; Kowalski, K.; Straatsma, T. P.; Van Dam, H. J. J.; Wang, D.; Nieplocha, J.; de Jong, Wa.] Pacific NW Natl Lab, William R Wiley Environm Mol Sci Lab, Richland, WA 99352 USA.
[Apra, E.] Oak Ridge Natl Lab, Computat Sci & Math Div, Oak Ridge, TN 37831 USA.
[Windus, T. L.] Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
RP Valiev, M (reprint author), Pacific NW Natl Lab, William R Wiley Environm Mol Sci Lab, POB 999, Richland, WA 99352 USA.
EM marat.valiev@pnl.gov
RI Apra, Edoardo/F-2135-2010; DE JONG, WIBE/A-5443-2008; Govind,
Niranjan/D-1368-2011;
OI Apra, Edoardo/0000-0001-5955-0734; DE JONG, WIBE/0000-0002-7114-8315;
van Dam, Hubertus Johannes Jacobus/0000-0002-0876-3294
FU division of Chemical Sciences; Office of Basic Energy Sciences,
Mathematical, Information, and Computational Sciences; U.S. DOE High
Performance Computing and Communications Initiative; Environmental and
Molecular Sciences Laboratory; Construction Project [D-384]; Department
of Energy's Office of Biological and Environmental Research; Office of
Science of the U.S. Department of Energy [DE-AC02-05CH11231]; NSF; U.S.
Government [DE-AC05-000R22725]
FX The funding sources for the development of NWChem and the parallel
software tools over the lifetime of the project include the division of
Chemical Sciences, the Office of Basic Energy Sciences, Mathematical,
Information, and Computational Sciences division of the Office of
Advanced Scientific Computing Research, the Office of Naval Research,
the U.S. DOE High Performance Computing and Communications Initiative,
the Environmental and Molecular Sciences Laboratory, the Construction
Project, D-384 and Operations, the Office of Biological and
Environmental Research. A portion of the research was performed using
EMSL, a national scientific user facility sponsored by the Department of
Energy's Office of Biological and Environmental Research and located at
Pacific Northwest National Laboratory. PNNL is operated by Battelle
Memorial Institute for the U.S. Department of Energy. This research used
resources of the National Energy Research Scientific Computing Center,
which is supported by the Office of Science of the U.S. Department of
Energy under Contract No. DE-AC02-05CH11231. T.L.W. acknowledges funding
from an NSF PetaApps grant. The submitted manuscript has been authored
by a contractor (E.A.) of the U.S. Government under Contract No.
DE-AC05-000R22725.
NR 132
TC 1332
Z9 1339
U1 29
U2 256
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0010-4655
EI 1879-2944
J9 COMPUT PHYS COMMUN
JI Comput. Phys. Commun.
PD SEP
PY 2010
VL 181
IS 9
BP 1477
EP 1489
DI 10.1016/j.cpc.2010.04.018
PG 13
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 638DX
UT WOS:000280873500001
ER
PT J
AU Binoth, T
Boudjema, F
Dissertori, G
Lazopoulos, A
Denner, A
Dittmaier, S
Frederix, R
Greiner, N
Hoche, S
Giele, W
Skands, P
Winter, J
Gleisberg, T
Archibald, J
Heinrich, G
Krauss, F
Maitre, D
Huber, M
Huston, J
Kauer, N
Maltoni, F
Oleari, C
Passarino, G
Pittau, R
Pozzorini, S
Reiter, T
Schumann, S
Zanderighi, G
AF Binoth, T.
Boudjema, F.
Dissertori, G.
Lazopoulos, A.
Denner, A.
Dittmaier, S.
Frederix, R.
Greiner, N.
Hoeche, S.
Giele, W.
Skands, P.
Winter, J.
Gleisberg, T.
Archibald, J.
Heinrich, G.
Krauss, F.
Maitre, D.
Huber, M.
Huston, J.
Kauer, N.
Maltoni, F.
Oleari, C.
Passarino, G.
Pittau, R.
Pozzorini, S.
Reiter, T.
Schumann, S.
Zanderighi, G.
TI A proposal for a standard interface between Monte Carlo tools and
one-loop programs
SO COMPUTER PHYSICS COMMUNICATIONS
LA English
DT Article
DE Monte Carlo tools; One-loop computations; Les Houches Accord
ID TO-LEADING ORDER; JET CROSS-SECTIONS; DIMENSIONAL REDUCTION;
AUTOMATIC-GENERATION; HELICITY AMPLITUDES; DIPOLE SUBTRACTION; NLO-QCD;
PHYSICS; REGULARIZATION; OBSERVABLES
AB Many highly developed Monte Carlo tools for the evaluation of cross sections based on tree matrix elements exist and are used by experimental collaborations in high energy physics. As the evaluation of one-loop matrix elements has recently been undergoing enormous progress, the combination of one-loop matrix elements with existing Monte Carlo tools is on the horizon. This would lead to phenomenological predictions at the next-to-leading order level. This note summarises the discussion of the next-to-leading order multi-leg (NLM) working group on this issue which has been taking place during the workshop on Physics at TeV Colliders at Les Houches, France, in June 2009. The result is a proposal for a standard interface between Monte Carlo tools and one-loop matrix element programs.
Dedicated to the memory of and in tribute to, Thomas Binoth, who led the effort to develop this proposal for Les Houches 2009. Thomas led the discussions, set up the subgroups, collected the contributions, and wrote and edited this paper. He made a promise that the paper would be on the arXiv the first week of January, and we are faithfully fulfilling his promise. In his honour, we would like to call this the Binoth Les Houches Accord. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Boudjema, F.] Univ Savoie, CNRS, LAPTH, F-74941 Annecy Le Vieux, France.
[Binoth, T.] Univ Edinburgh, Edinburgh EH9 3JZ, Midlothian, Scotland.
[Dissertori, G.; Lazopoulos, A.] ETH, Dept Phys, CH-5232 Zurich, Switzerland.
[Denner, A.] Paul Scherrer Inst, CH-5232 Villigen, Switzerland.
[Dittmaier, S.] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany.
[Frederix, R.; Greiner, N.; Hoeche, S.] Univ Zurich, CH-8057 Zurich, Switzerland.
[Giele, W.; Skands, P.; Winter, J.] FNAL, Batavia, IL 60510 USA.
[Gleisberg, T.] Stanford Univ, SLAC, Stanford, CA 94309 USA.
[Archibald, J.; Heinrich, G.; Krauss, F.; Maitre, D.] Univ Durham, IPPP, Durham DH1 3LE, England.
[Huber, M.] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany.
[Huston, J.] Michigan State Univ, E Lansing, MI 48840 USA.
[Kauer, N.] Univ London, Dept Phys, Egham TW20 0EX, Surrey, England.
[Maltoni, F.] Catholic Univ Louvain, CP3, B-1348 Louvain, Belgium.
[Oleari, C.] Univ Milano Bicocca, I-20126 Milan, Italy.
[Passarino, G.] Univ Turin, INFN, Sez Torino, Turin, Italy.
[Passarino, G.] Univ Turin, Dip Fis Teor, Turin, Italy.
[Pozzorini, S.] CERN PH, CH-1211 Geneva 23, Switzerland.
[Pittau, R.] Univ Granada, Dept Fis Teor & Cosmos CAFPE, E-18071 Granada, Spain.
[Schumann, S.] Heidelberg Univ, Inst Theoret Phys, D-69120 Heidelberg, Germany.
[Zanderighi, G.] Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3PN, England.
RP Boudjema, F (reprint author), Univ Savoie, CNRS, LAPTH, 9 Chemin Bellevue,BP 110, F-74941 Annecy Le Vieux, France.
EM boudjema@lapp.in2p3.fr
RI Pittau, Roberto/E-7953-2016;
OI Pittau, Roberto/0000-0003-1365-2959; Oleari, Carlo/0000-0003-3526-9280;
Krauss, Frank/0000-0001-5043-3099; Hoeche, Stefan/0000-0002-1370-6059;
Passarino, Giampiero/0000-0001-6379-4686; Skands,
Peter/0000-0003-0024-3822; Denner, Ansgar/0000-0002-7179-1132
NR 77
TC 58
Z9 58
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0010-4655
J9 COMPUT PHYS COMMUN
JI Comput. Phys. Commun.
PD SEP
PY 2010
VL 181
IS 9
BP 1612
EP 1622
DI 10.1016/j.cpc.2010.05.016
PG 11
WC Computer Science, Interdisciplinary Applications; Physics, Mathematical
SC Computer Science; Physics
GA 638DX
UT WOS:000280873500015
ER
PT J
AU Tang, GP
Mayes, MA
Parker, JC
Jardine, PM
AF Tang, Guoping
Mayes, Melanie A.
Parker, Jack C.
Jardine, Philip M.
TI CXTFIT/Excel-A modular adaptable code for parameter estimation,
sensitivity analysis and uncertainty analysis for laboratory or field
tracer experiments
SO COMPUTERS & GEOSCIENCES
LA English
DT Article
DE Equilibrium/nonequilibrium convection dispersion equation; Weighted
nonlinear least squares; Penalty function; Monte Carlo analysis;
Response surface
AB We implemented the widely used CXTFIT code in Excel to provide flexibility and added sensitivity and uncertainty analysis functions to improve transport parameter estimation and to facilitate model discrimination for multi-tracer experiments on structured soils. Analytical solutions for one-dimensional equilibrium and nonequilibrium convection dispersion equations were coded as VBA functions so that they could be used as ordinary math functions in Excel for forward predictions. Macros with user-friendly interfaces were developed for optimization, sensitivity analysis, uncertainty analysis, error propagation, response surface calculation, and Monte Carlo analysis. As a result, any parameter with transformations (e.g., dimensionless, log-transformed, species-dependent reactions, etc.) could be estimated with uncertainty and sensitivity quantification for multiple tracer data at multiple locations and times. Prior information and observation errors could be incorporated into the weighted nonlinear least squares method with a penalty function. Users are able to change selected parameter values and view the results via embedded graphics, resulting in a flexible tool applicable to modeling transport processes and to teaching students about parameter estimation. The code was verified by comparing to a number of benchmarks with CXTFIT 2.0. It was applied to improve parameter estimation for four typical tracer experiment data sets in the literature using multi-model evaluation and comparison. Additional examples were included to illustrate the flexibilities and advantages of CXTFIT/Excel. The VBA macros were designed for general purpose and could be used for any parameter estimation/model calibration when the forward solution is implemented in Excel. A step-by-step tutorial, example Excel files and the code are provided as supplemental material. Published by Elsevier Ltd.
C1 [Tang, Guoping; Mayes, Melanie A.] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA.
[Parker, Jack C.] Univ Tennessee, Dept Civil & Environm Engn, Knoxville, TN 37996 USA.
[Jardine, Philip M.] Univ Tennessee, Dept Biosyst Engn & Soil Sci, Knoxville, TN 37996 USA.
RP Tang, GP (reprint author), Oak Ridge Natl Lab, Div Environm Sci, POB 2008,MS 6038, Oak Ridge, TN 37831 USA.
EM tangg@ornl.gov
RI Tang, Guoping/A-5141-2010
OI Tang, Guoping/0000-0003-1090-3564
FU U.S. Department of Energy, Office of Science, Office of the Biological
and Environmental Research; US DOE [DE-AC05-00OR22725]
FX We appreciate the review comments provided by Dr. Philip Meyer and
another anonymous reviewer, which significantly helped improve this
paper. This research was funded by the U.S. Department of Energy, Office
of Science, Office of the Biological and Environmental Research. Oak
Ridge National Laboratory is managed by the University of
Tennessee-Battelle, LLC, under contract DE-AC05-00OR22725 with the US
DOE.
NR 14
TC 25
Z9 27
U1 0
U2 27
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0098-3004
J9 COMPUT GEOSCI-UK
JI Comput. Geosci.
PD SEP
PY 2010
VL 36
IS 9
BP 1200
EP 1209
DI 10.1016/j.cageo.2010.01.013
PG 10
WC Computer Science, Interdisciplinary Applications; Geosciences,
Multidisciplinary
SC Computer Science; Geology
GA 654XL
UT WOS:000282204300012
ER
PT J
AU De Chant, LJ
AF De Chant, Lawrence J.
TI A semi-infinite domain eigenvalue problem describing turbulent velocity
fluctuations
SO COMPUTERS & MATHEMATICS WITH APPLICATIONS
LA English
DT Article
DE Eigenvalue problem; Turbulent velocity fluctuations
AB This paper discusses the formulation and approximate solution of an eigenvalue problem that provides estimates for fully turbulent velocity fluctuations. The fluctuating velocity model is derived by splitting the Reynolds decomposed (but not averaged) Navier-Stokes equations into mean and fluctuating expressions. The linear fluctuating portion of the equations (normally lost to averaging) poses a semi-infinite domain eigenvalue problem. Approximate analytical solutions are derived that suggest a qualitatively physically plausible solution. The derivation and use of these expressions are not known in the literature implying that a qualitative scoping study of this nature is appropriate. This type of analysis provides support for the practical application of these equations to estimate structural loadings due to the presence of turbulent velocity and pressure fluctuations. (C) 2010 Elsevier Ltd. All rights reserved.
C1 Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP De Chant, LJ (reprint author), Sandia Natl Labs, Albuquerque, NM 87185 USA.
EM ljdecha@sandia.gov
NR 17
TC 0
Z9 0
U1 0
U2 1
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0898-1221
J9 COMPUT MATH APPL
JI Comput. Math. Appl.
PD SEP
PY 2010
VL 60
IS 5
BP 1177
EP 1183
DI 10.1016/j.camwa.2010.05.041
PG 7
WC Mathematics, Applied
SC Mathematics
GA 643ZQ
UT WOS:000281340600005
ER
PT J
AU Lance, SL
Jones, KL
Hagen, C
Jordaens, K
Backeljau, T
Prevot, V
AF Lance, Stacey L.
Jones, Kenneth L.
Hagen, Cris
Jordaens, Kurt
Backeljau, Thierry
Prevot, Vanya
TI Fifteen microsatellite loci for the decollate snail, Rumina decollata
SO CONSERVATION GENETICS RESOURCES
LA English
DT Article
DE Rumina; Land snail; Microsatellite; PCR primers; SSR; STR
AB We characterized 15 microsatellite loci from the decollate snail, Rumina decollata. Loci were screened in 21 individuals and several individuals of the congener Rumina saharica. There was ample allelic diversity (6-12 alleles per locus) but observed heterozygosity values were extremely low (0-0.421). This was expected given the high self-fertilization rate in this species. Ten of the 15 loci were successfully amplified in R. saharica. These loci provide tools for examining the population genetics and taxomomic boundaries in R. decollata and its allies.
C1 [Backeljau, Thierry; Prevot, Vanya] Royal Belgian Inst Nat Sci, B-1000 Brussels, Belgium.
[Lance, Stacey L.; Hagen, Cris] Univ Georgia, Savannah River Ecol Lab, Aiken, SC 29802 USA.
[Jones, Kenneth L.] Univ Georgia, Georgia Genom Facil, Athens, GA 30602 USA.
[Jordaens, Kurt] Royal Museum Cent Africa, B-3080 Tervuren, Belgium.
[Jordaens, Kurt; Backeljau, Thierry] Univ Antwerp, Evolutionary Ecol Grp, B-2020 Antwerp, Belgium.
[Prevot, Vanya] Univ Libre Bruxelles, B-1050 Brussels, Belgium.
RP Prevot, V (reprint author), Royal Belgian Inst Nat Sci, Vautierstr 29, B-1000 Brussels, Belgium.
EM vanya.prevot@naturalsciences.be
RI Lance, Stacey/K-9203-2013
OI Lance, Stacey/0000-0003-2686-1733
FU Fonds National de la Recherche Scientifique, Belgium; Department of
Energy [DE-FC09-07SR22506]
FX Vanya Prevot was funded by the "Fonds National de la Recherche
Scientifique", Belgium. Manuscript preparation was partially supported
by the Department of Energy under Award Number DE-FC09-07SR22506 to the
University of Georgia Research Foundation.
NR 10
TC 3
Z9 3
U1 0
U2 3
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1877-7252
J9 CONSERV GENET RESOUR
JI Conserv. Genet. Resour.
PD SEP
PY 2010
VL 2
SU 1
BP 287
EP 289
DI 10.1007/s12686-010-9193-6
PG 3
WC Biodiversity Conservation; Genetics & Heredity
SC Biodiversity & Conservation; Genetics & Heredity
GA 761QP
UT WOS:000290413000068
ER
PT J
AU Davidovich, RL
Stavila, V
Whitmire, KH
AF Davidovich, Ruven L.
Stavila, Vitalie
Whitmire, Kenton H.
TI Stereochemistry of lead(II) complexes containing sulfur and selenium
donor atom ligands
SO COORDINATION CHEMISTRY REVIEWS
LA English
DT Review
DE Lead; Sulfur; Selenium; VSEPR; Stereochemically active; Lone pair
ID THIOUREA COORDINATION-COMPLEXES; GROUP METAL-CATIONS; SINGLE-SOURCE
PRECURSORS; RAY CRYSTAL-STRUCTURE; MOLECULAR-STRUCTURE; PB(II) SALTS;
SUPRAMOLECULAR ASSOCIATIONS; STRUCTURAL-CHARACTERIZATION; CHEMISTRY; PB
AB The stereochemistry of lead(II) complexes with S- and Se-donor atom ligands, including mixed ligand complexes is reviewed with respect to the geometry of the first coordination sphere of the Pb(II) atom in these compounds and rationalized in terms of the valence shell electron-pair repulsion (VSEPR) model. The most comprehensively structurally characterized classes of lead(II) thio and seleno complexes are discussed, including monothio-, dithio(seleno)-, trithio- and tetrathio-complexes, as well as Pb(II) dialkyldithio(seleno)carbamates, alkylxanthates and dialkyl(aryl) phosphorodithio(seleno)lates. Data about the polyhedral shape of the primary coordination sphere, coordination number (CN), bond lengths (primary and secondary) and bond angles of the Pb(II) atom in the compounds under investigation are systematized in comprehensive tables. The particularities of the stereochemistry of Pb(II) complexes with S(Se)-donor atom ligands are comparatively discussed with the stereochemistry of lead(II) complexes with oxygen donor ligands. (c) 2010 Elsevier B.V. All rights reserved.
C1 [Davidovich, Ruven L.] Russian Acad Sci, Inst Chem, Far E Div, Vladivostok 690022, Russia.
[Stavila, Vitalie] Sandia Natl Labs, Livermore, CA 94550 USA.
[Whitmire, Kenton H.] Rice Univ, Dept Chem, Houston, TX 77005 USA.
RP Davidovich, RL (reprint author), Russian Acad Sci, Inst Chem, Far E Div, Pr T 100 Letiya Vladivostoka 159, Vladivostok 690022, Russia.
EM davidovich@ich.dvo.ru; whitmir@rice.edu
RI Stavila, Vitalie/F-4188-2010; Stavila, Vitalie/B-6464-2008;
OI Stavila, Vitalie/0000-0003-0981-0432; Whitmire,
Kenton/0000-0001-7362-535X
FU Robert A. Welch Foundation [C-0976]; National Science Foundation
[CHE-0719396, DGE-0411679, EEC-0647452]; U.S. Civilian Research and
Development Foundation [MTFP-1015]
FX R.L.D. acknowledges Prof. F.H. Herbstein (Technion - Israel Institute of
Technology, Haifa, Israel) for providing reprints of the publications on
crystal structures of Pb(II) thiourea complexes, Dr. R.F. Klevtsova
(A.V. Nikolaev Institute of Inorganic Chemistry SD RAS, Novosibirsk) for
providing CIF-files of some lead(II) mixed-ligand thiophosphinate
complexes and Dr. E.I. Voit (Institute of Chemistry, F.E. Division RAS,
Vladivostok) for DFT analyzis of Pb(II) thiolate complexes. KHW thanks
the Robert A. Welch Foundation (C-0976), the National Science Foundation
(CHE-0719396, DGE-0411679, EEC-0647452) and the U.S. Civilian Research
and Development Foundation (MTFP-1015) for financial support.
NR 122
TC 51
Z9 52
U1 2
U2 27
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0010-8545
J9 COORDIN CHEM REV
JI Coord. Chem. Rev.
PD SEP
PY 2010
VL 254
IS 17-18
BP 2193
EP 2226
DI 10.1016/j.ccr.2010.05.013
PG 34
WC Chemistry, Inorganic & Nuclear
SC Chemistry
GA 631VV
UT WOS:000280379500012
ER
PT J
AU Tian, JA
Motkuri, RK
Thallapally, PK
AF Tian, Jian
Motkuri, Radha Kishan
Thallapally, Praveen K.
TI Generation of 2D and 3D (PtS, Adamantanoid) Nets with a Flexible
Tetrahedral Building Block
SO CRYSTAL GROWTH & DESIGN
LA English
DT Article
ID METAL-ORGANIC FRAMEWORKS; GAS-ADSORPTION; DESIGN; NETWORKS; HYDROGEN;
SOLIDS; SITES
AB The self-assembly of the flexible tetrahedral linker tetrakis[4-(carboxyphenyl)oxamethyl]methane acid with various transition metals (Cu, Co, and Mg) results in a 2D layered structure and 3D frameworks with PtS and adamantanoid topology. The PtS net exhibits permanent porosity, as confirmed by BET and gas adsorption experiments.
C1 [Tian, Jian; Motkuri, Radha Kishan; Thallapally, Praveen K.] Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA.
RP Thallapally, PK (reprint author), Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA.
EM Praveen.Thallapally@pnl.gov
RI Tian, Jian/I-8637-2012; Motkuri, Radha/F-1041-2014; thallapally,
praveen/I-5026-2014
OI Motkuri, Radha/0000-0002-2079-4798; thallapally,
praveen/0000-0001-7814-4467
FU U.S. Department of Energy, Office of Basic Energy Sciences, Division of
Materials Sciences and Engineering [KC020105-FWP12152]; U.S. Department
of Energy [DE-AC05-76RL01830]
FX P.K.T. thanks the U.S. Department of Energy, Office of Basic Energy
Sciences, Division of Materials Sciences and Engineering, under Award
KC020105-FWP12152, for the synthesis and characterization part and the
Office of Fossil Energy for CO2 uptake measurments. The
Pacific Northwest National Laboratory is operated by Battelle for the
U.S. Department of Energy under Contract DE-AC05-76RL01830.
NR 36
TC 14
Z9 14
U1 1
U2 7
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 SEP
PY 2010
VL 10
IS 9
BP 3843
EP 3846
DI 10.1021/cg1005677
PG 4
WC Chemistry, Multidisciplinary; Crystallography; Materials Science,
Multidisciplinary
SC Chemistry; Crystallography; Materials Science
GA 644DW
UT WOS:000281353900003
ER
PT J
AU Fernandez, CA
Thallapally, PK
Liu, J
Peden, CHF
AF Fernandez, Carlos A.
Thallapally, Praveen K.
Liu, Jun
Peden, Charles H. F.
TI Effect of Produced HCl during the Catalysis on Micro- and Mesoporous
MOFs
SO CRYSTAL GROWTH & DESIGN
LA English
DT Article
ID METAL-ORGANIC FRAMEWORKS; COORDINATION-FRAMEWORK; SHAPE-SELECTIVITY; H-2
ADSORPTION; DESIGN; FUNCTIONALITY; HYDROGEN; STORAGE; CO2
AB This paper reports the influence of alkylation reaction byproducts, particularly HCl, on MOF-5. Reaction between tert-butyl chloride and toluene or biphenyl in the presence of MOF-5 as a catalyst generates an unusual structural transformation which was proved to be due to the formation of byproduct HCl by means of powder X-ray diffraction analysis. Despite this, the highly desirable catalytic performance in terms of high conversions ( > 99%) and selectivity ( > 98%) toward the less bulky para-oriented products is maintained.
C1 [Fernandez, Carlos A.; Thallapally, Praveen K.] Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA.
[Liu, Jun; Peden, Charles H. F.] Pacific NW Natl Lab, Fundamental & Computat Sci Directorate, Richland, WA 99352 USA.
RP Thallapally, PK (reprint author), Pacific NW Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA.
EM Praveen.thallapally@pnl.gov
RI thallapally, praveen/I-5026-2014;
OI thallapally, praveen/0000-0001-7814-4467; Peden,
Charles/0000-0001-6754-9928
FU DOE/Office of Science, Division of Chemical Sciences Geosciences, and
Biosciences; U.S. Department of Energy, Office of Basic Energy Sciences,
Division of Materials Sciences and Engineering [KC020105-FWP12152]; DOE
[DE-AC05-76RL01830]
FX This work was initially started under Laboratory Directed Research
Development funding. P.K. T. and J.L. acknowledge the U.S. Department of
Energy, Office of Basic Energy Sciences, Division of Materials Sciences
and Engineering, under Award KC020105-FWP12152 for developing and
characterizing the materials. C.H.F.P. acknowledges support from the
DOE/Office of Science, Division of Chemical Sciences Geosciences, and
Biosciences, for analyzing the catalytic reactions. PNNL is a
multiprogram national laboratory operated for DOE by Battelle under
Contract DE-AC05-76RL01830.
NR 26
TC 14
Z9 14
U1 5
U2 33
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 SEP
PY 2010
VL 10
IS 9
BP 4118
EP 4122
DI 10.1021/cg100796e
PG 5
WC Chemistry, Multidisciplinary; Crystallography; Materials Science,
Multidisciplinary
SC Chemistry; Crystallography; Materials Science
GA 644DW
UT WOS:000281353900041
ER
PT J
AU Meng, XD
Ji, YQ
Jiang, H
AF Meng, Xiandong
Ji, Yanqing
Jiang, Hai
TI Advanced Acceleration Technologies for Biological Sequence Analyses
SO CURRENT BIOINFORMATICS
LA English
DT Article
DE Smith-waterman algorithm; SIMD; FPGA; GPU; DSP; heterogeneous computing;
biological sequence analysis
ID AMINO-ACID-COMPOSITION; SUBCELLULAR LOCATION PREDICTION; STRUCTURAL
CLASS PREDICTION; PROTEASE CLEAVAGE SITES; SMITH-WATERMAN; WEB-SERVER;
EVOLUTION INFORMATION; SIGNAL PEPTIDES; PROTEINS; ALIGNMENT
AB There has been substantial evidence that functional and structural analyses of genes and proteins can help develop new drugs, diagnose medical conditions and find cures for diseases. However, these biological sequence analyses require large-scale computational power due to the exponential growth of genomic information. During the past two decades considerable efforts have been expended in trying to accelerate the biological sequence database search process which is the fundamental step for further analyses. Various software approaches including SIMD (Single Instruction Multiple Data) instruction, multithreading, message passing programming paradigm and I/O optimization have been employed to speed up the process on different computing platforms at different levels. Hardware techniques such as FPGA (Field Programmable Gate Arrays), GPU (Graphics Processing Unit), IBM CELL BE, DSP (Digital Signal Processors) and ASIC (Applications Specific Integrated Circuit) have also been widely used. This paper reviews relevant computing platforms, various software and hardware approaches as well as the performances they achieved in high throughput sequence database search. It demonstrates that parallelism can be exploited at different phases, granularity levels, types, software/hardware levels and scopes. This would help researchers understand current development strategies and possible future trends such as aggregate heterogeneous systems in high performance biological sequence analysis.
C1 [Meng, Xiandong] US DOE, Joint Genome Inst, Walnut Creek, CA 94598 USA.
[Ji, Yanqing] Gonzaga Univ, Dept Elect & Comp Engn, Spokane, WA 99258 USA.
[Jiang, Hai] Arkansas State Univ, Dept Comp Sci, Jonesboro, AR 72467 USA.
RP Meng, XD (reprint author), US DOE, Joint Genome Inst, Walnut Creek, CA 94598 USA.
EM xiandongmeng@lbl.gov
NR 85
TC 0
Z9 0
U1 1
U2 4
PU BENTHAM SCIENCE PUBL LTD
PI SHARJAH
PA EXECUTIVE STE Y26, PO BOX 7917, SAIF ZONE, 1200 BR SHARJAH, U ARAB
EMIRATES
SN 1574-8936
J9 CURR BIOINFORM
JI Curr. Bioinform.
PD SEP
PY 2010
VL 5
IS 3
BP 176
EP 194
PG 19
WC Biochemical Research Methods; Mathematical & Computational Biology
SC Biochemistry & Molecular Biology; Mathematical & Computational Biology
GA 661XK
UT WOS:000282766500003
ER
PT J
AU Weier, JF
Ferlatte, C
Weier, HUG
AF Weier, Jingly F.
Ferlatte, Christy
Weier, Heinz-Ulli G.
TI Somatic Genomic Variations in Extra-Embryonic Tissues
SO CURRENT GENOMICS
LA English
DT Article
DE Gestation; placenta; uterine invasion; cytotrophoblast; aneuploidy;
fluorescence in situ hybridization
ID CONFINED PLACENTAL MOSAICISM; PREIMPLANTATION GENETIC DIAGNOSIS;
ANEUPLOIDY INVOLVING CHROMOSOME-1; IN-SITU HYBRIDIZATION; SATELLITE DNA
PROBES; SPONTANEOUS-ABORTIONS; CYTOTROPHOBLAST DIFFERENTIATION;
UNIPARENTAL DISOMY; HUMAN TROPHOBLASTS; INTERPHASE CELLS
AB In the mature chorion, one of the membranes that exist during pregnancy between the developing fetus and mother, human placental cells form highly specialized tissues composed of mesenchyme and floating or anchoring villi. Using fluorescence in situ hybridization, we found that human invasive cytotrophoblasts isolated from anchoring villi or the uterine wall had gained individual chromosomes; however, chromosome losses were detected infrequently. With chromosomes gained in what appeared to be a chromosome-specific manner, more than half of the invasive cytotrophoblasts in normal pregnancies were found to be hyperdiploid. Interestingly, the rates of hyperdiploid cells depended not only on gestational age, but were strongly associated with the extraembryonic compartment at the fetal-maternal interface from which they were isolated. Since hyperdiploid cells showed drastically reduced DNA replication as measured by bromodeoxyuridine incorporation, we conclude that aneuploidy is a part of the normal process of placentation potentially limiting the proliferative capabilities of invasive cytotrophoblasts. Thus, under the special circumstances of human reproduction, somatic genomic variations may exert a beneficial, anti-neoplastic effect on the organism.
C1 [Weier, Jingly F.; Ferlatte, Christy] Univ Calif San Francisco, San Francisco, CA 94143 USA.
[Weier, Jingly F.; Ferlatte, Christy; Weier, Heinz-Ulli G.] UC LBNL, Div Life Sci, Dept Canc & DNA Damage Responses, Berkeley, CA USA.
RP Weier, HUG (reprint author), EO Lawrence Berkeley Natl Lab, Div Life Sci, Dept Canc & DNA Damage Responses, 1 Cyclotron Rd,MS 977-250, Berkeley, CA 94720 USA.
EM ugweier@lbl.gov
FU Office of Energy Research, Office of Health and Environmental Research,
U.S. Department of Energy [DE-AC02-05CH11231]; NIH [CA88258, HD41425,
HD45736, CA123370, CA136685]
FX This work was supported in parts by a grant from the Director, Office of
Energy Research, Office of Health and Environmental Research, U.S.
Department of Energy, under contract DE-AC02-05CH11231 and NIH grants
CA88258, HD41425, HD45736, CA123370 and CA136685. Ideograms were kindly
provided by D. Adler, Ph.D., Dept. of Pathology, Univ. Washington. We
acknowledge the support from researchers and staff at UCSF providing
metaphase spreads and placental tissues. We wish to thank Drs. M.
McMaster and S. Fisher for continued support and many helpful
discussions.
NR 65
TC 5
Z9 7
U1 0
U2 1
PU BENTHAM SCIENCE PUBL LTD
PI SHARJAH
PA EXECUTIVE STE Y26, PO BOX 7917, SAIF ZONE, 1200 BR SHARJAH, U ARAB
EMIRATES
SN 1389-2029
J9 CURR GENOMICS
JI Curr. Genomics
PD SEP
PY 2010
VL 11
IS 6
BP 402
EP 408
DI 10.2174/138920210793175994
PG 7
WC Biochemistry & Molecular Biology; Genetics & Heredity
SC Biochemistry & Molecular Biology; Genetics & Heredity
GA 645FO
UT WOS:000281436800005
PM 21358984
ER
PT J
AU Houston, JP
Naivar, MA
Freyer, JP
AF Houston, Jessica P.
Naivar, Mark A.
Freyer, James P.
TI Digital Analysis and Sorting of Fluorescence Lifetime by Flow Cytometry
SO CYTOMETRY PART A
LA English
DT Article
DE fluorescence lifetime; digital flow cytometry; phase-sensitive flow
cytometry
ID FLUOROCHROME-LABELED CELLS; DEUTERIUM-OXIDE; DNA; PARTICLES; BINDING;
SIGNALS
AB Frequency-domain flow cytometry techniques are combined with modifications to the digital signal-processing capabilities of the open reconfigurable cytometric acquisition system (ORCAS) to analyze fluorescence decay lifetimes and control sorting. Real-time fluorescence lifetime analysis is accomplished by rapidly digitizing correlated, radiofrequency (RF)-modulated detector signals, implementing Fourier analysis programming with ORCAS' digital signal processor (DSP) and converting the processed data into standard cytometric list mode data. To systematically test the capabilities of the ORCAS 50 MS/sec analog-to-digital converter (ADC) and our DSP programming, an error analysis was performed using simulated light scatter and fluorescence waveforms (0.5-25 ns simulated lifetime), pulse widths ranging from 2 to 15 mu s, and modulation frequencies from 2.5 to 16.667 MHz. The standard deviations of digitally acquired lifetime values ranged from 0.112 to >2 ns, corresponding to errors in actual phase shifts from 0.0142 degrees to 1.6 degrees. The lowest coefficients of variation (<1%) were found for 10-MHz modulated waveforms having pulse widths of 6 is and simulated lifetimes of 4 ns. Direct comparison of the digital analysis system to a previous analog phase-sensitive flow cytometer demonstrated similar precision and accuracy on measurements of a range of fluorescent microspheres, unstained cells, and cells stained with three common fluorophores. Sorting based on fluorescence lifetime was accomplished by adding analog outputs to ORCAS and interfacing with a commercial cell sorter with a RF-modulated solid-state laser. Two populations of fluorescent microspheres with overlapping fluorescence intensities but different lifetimes (2 and 7 ns) were separated to similar to 98% purity. Overall, the digital signal acquisition and processing methods we introduce present a simple yet robust approach to phase-sensitive measurements in flow cytometry. The ability to simply and inexpensively implement this system on a commercial flow sorter will allow both better dissemination of this technology and better exploitation of the traditionally underutilized parameter of fluorescence lifetime. Published 2010 Wiley-Liss, Inc.(dagger)
C1 [Houston, Jessica P.; Naivar, Mark A.; Freyer, James P.] Los Alamos Natl Lab, Biosci Div, Los Alamos, NM 87545 USA.
RP Freyer, JP (reprint author), Los Alamos Natl Lab, Biosci Div, MS M888, Los Alamos, NM 87545 USA.
EM freyer@lanl.gov
FU National Institutes of Health [RR001315]; Laboratory Directed Research;
National Flow Cytometry and Sorting Research Resource; Laboratory
Directed Research and Development; Los Alamos National Laboratory
FX Grant sponsor: National Institutes of Health; Grant number: RR001315
(National Flow Cytometry and Sorting Research Resource); Grant sponsor:
Laboratory Directed Research and Grant sponsor: National Flow Cytometry
and Sorting Research Resource; Laboratory Directed Research and
Development (Director's Office Postdoctoral Fellow funding from the Los
Alamos National Laboratory);
NR 18
TC 23
Z9 23
U1 1
U2 22
PU WILEY-LISS
PI HOBOKEN
PA DIV JOHN WILEY & SONS INC, 111 RIVER ST, HOBOKEN, NJ 07030 USA
SN 1552-4922
J9 CYTOM PART A
JI Cytom. Part A
PD SEP
PY 2010
VL 77A
IS 9
BP 861
EP 872
DI 10.1002/cyto.a.20930
PG 12
WC Biochemical Research Methods; Cell Biology
SC Biochemistry & Molecular Biology; Cell Biology
GA 646AU
UT WOS:000281508100009
PM 20662090
ER
PT J
AU Carvalho, EA
Ushizima, DM
Medeiros, FNS
Martins, CIO
Marques, RCP
Oliveira, INS
AF Carvalho, E. A.
Ushizima, D. M.
Medeiros, F. N. S.
Martins, C. I. O.
Marques, R. C. P.
Oliveira, I. N. S.
TI SAR imagery segmentation by statistical region growing and hierarchical
merging
SO DIGITAL SIGNAL PROCESSING
LA English
DT Article
DE SAR image segmentation; Region growing; Hierarchical merging; Hypothesis
testing; Speckle noise
ID SPECKLE; NOISE; EDGE; MODEL; ENHANCEMENT; ALGORITHMS; DETECTOR
AB This paper presents an algorithm to segment synthetic aperture radar (SAR) images, corrupted by speckle noise. Most standard segmentation techniques may require speckle filtering previously. Our approach performs radar image segmentation using the original noisy pixels as input data, i.e. without any preprocessing step. The algorithm includes a statistical region growing procedure combined with hierarchical region merging. The region growing step oversegments the input radar image, thus enabling region aggregation by employing a combination of the Kolmogorov-Smirnov (KS) test with a hierarchical stepwise optimization (HSWO) algorithm for performance improvement. We have tested and assessed the proposed technique on artificially speckled image and real SAR data. (C) 2009 Elsevier Inc. All rights reserved.
C1 [Carvalho, E. A.; Medeiros, F. N. S.; Martins, C. I. O.; Marques, R. C. P.] Univ Fed Ceara, Grp Proc Imagens, Dept Teleinformat DETI, Fortaleza, Ceara, Brazil.
[Ushizima, D. M.] Lawrence Berkeley Natl Lab, Math Grp, Berkeley, CA USA.
[Ushizima, D. M.] Lawrence Berkeley Natl Lab, Visualizat Grp, Berkeley, CA USA.
[Oliveira, I. N. S.] Univ Fed Ceara, Dept Elect Engn, Fortaleza, Ceara, Brazil.
RP Medeiros, FNS (reprint author), Campus Pici,Bloco 725, BR-60455970 Fortaleza, Ceara, Brazil.
EM eduardo@deti.ufc.br; daniela@hpcrd.lbl.gov; fsombra@ufc.br;
charlesiury@vision.ime.usp.br; regismarques@cefet-ce.br; isombra@ufc.br
RI Medeiros, Fatima/E-1168-2011; Marques, Regis/D-2039-2013
OI Medeiros, Fatima/0000-0002-4143-1486;
FU CNPq, Brazil; Office of Energy Research, U.S. Department of Energy
[DE-AC03-76SF00098]
FX This work was developed with partial financial support from CNPq, Brazil
and from Applied Mathematical Science sub-program of the Office of
Energy Research, U.S. Department of Energy, under Contract Number
DE-AC03-76SF00098. The authors also gratefully acknowledge the valuable
contributions of the referees.
NR 39
TC 18
Z9 21
U1 1
U2 10
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 1051-2004
J9 DIGIT SIGNAL PROCESS
JI Digit. Signal Prog.
PD SEP
PY 2010
VL 20
IS 5
BP 1365
EP 1378
DI 10.1016/j.dsp.2009.10.014
PG 14
WC Engineering, Electrical & Electronic
SC Engineering
GA 613IY
UT WOS:000278973800006
ER
PT J
AU Dubinsky, EA
Silver, WL
Firestone, MK
AF Dubinsky, Eric A.
Silver, Whendee L.
Firestone, Mary K.
TI Tropical forest soil microbial communities couple iron and carbon
biogeochemistry
SO ECOLOGY
LA English
DT Article
DE bacteria; carbon cycling; iron reduction; Luquillo Mountains;
methanogenisis; microbial ecology; Puerto Rico; tropical forest soils
ID FE(III) OXIDE REDUCTION; FRESH-WATER SEDIMENT; SALT-MARSH SEDIMENTS;
PROCESS-BASED MODEL; FERRIC IRON; OXIDIZING BACTERIA; ORGANIC-CARBON;
FE(III)-REDUCING BACTERIA; PHOSPHORUS SOLUBILIZATION; IRON(III)
REDUCTION
AB We report that iron-reducing bacteria are primary mediators of anaerobic carbon oxidation in upland tropical soils spanning a rainfall gradient (3500-5000 mm/yr) in northeast Puerto Rico. The abundant rainfall and high net primary productivity of these tropical forests provide optimal soil habitat for iron-reducing and iron-oxidizing bacteria. Spatially and temporally dynamic redox conditions make iron-transforming microbial communities central to the belowground carbon cycle in these wet tropical forests. The exceedingly high abundance of iron-reducing bacteria (up to 1.2 x 10(9) cells per gram soil) indicated that they possess extensive metabolic capacity to catalyze the reduction of iron minerals. In soils from the higher rainfall sites, measured rates of ferric iron reduction could account for up to 44% of organic carbon oxidation. Iron reducers appeared to compete with methanogens when labile carbon availability was limited. We found large numbers of bacteria that oxidize reduced iron at sites with high rates of iron reduction and large numbers of iron reducers. The coexistence of large populations of iron-reducing and iron-oxidizing bacteria is evidence for rapid iron cycling between its reduced and oxidized states and suggests that mutualistic interactions among these bacteria ultimately fuel organic carbon oxidation and inhibit CH(4) production in these upland tropical forests.
C1 [Dubinsky, Eric A.; Silver, Whendee L.; Firestone, Mary K.] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Ecosyst Sci Div, Berkeley, CA 94720 USA.
RP Dubinsky, EA (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Dept Ecol, 1 Cyclotron Rd,MS 70A-3317, Berkeley, CA 94720 USA.
EM eric.dubinsky@gmail.com
RI Silver, Whendee/H-1118-2012; Dubinsky, Eric/D-3787-2015
OI Dubinsky, Eric/0000-0002-9420-6661
FU National Science Foundation (NSF) [DEB-0543558, DEB-0218039]; NASA
[NGT5-30463]; Mellon Foundation; USDA- IITF
FX We thank Jeff Bird, Paul Brooks, Julian Fortney, Don Herman, and Forest
Kaser for laboratory assistance. The USDA International Institute for
Tropical Forestry (IITF) provided logistical and infrastructural support
for field research. A National Science Foundation (NSF) Graduate
Research Fellowship and NASA Earth System Science Fellowship NGT5-30463
supported E. A. Dubinsky. NSF grant DEB-0543558 and a grant from the
Mellon Foundation to M. K. Firestone and W. L. Silver funded this work.
Support was also provided by NSF grant DEB-0218039 to the Institute of
Tropical Ecosystem Studies, UPR, and USDA- IITF as part of the Long-Term
Ecological Research Program in the Luquillo Experimental Forest.
NR 62
TC 49
Z9 51
U1 7
U2 91
PU ECOLOGICAL SOC AMER
PI WASHINGTON
PA 1990 M STREET NW, STE 700, WASHINGTON, DC 20036 USA
SN 0012-9658
J9 ECOLOGY
JI Ecology
PD SEP
PY 2010
VL 91
IS 9
BP 2604
EP 2612
DI 10.1890/09-1365.1
PG 9
WC Ecology
SC Environmental Sciences & Ecology
GA 648MO
UT WOS:000281698400017
PM 20957955
ER
PT J
AU Kreitzer, JD
Belk, MC
Gonzalez, DB
Tuckfield, RC
Shiozawa, DK
Rasmussen, JE
AF Kreitzer, J. D.
Belk, M. C.
Gonzalez, D. B.
Tuckfield, R. C.
Shiozawa, D. K.
Rasmussen, J. E.
TI Ontogenetic diet shift in the June sucker Chasmistes liorus
(Cypriniformes, Catostomidae) in the early juvenile stage
SO ECOLOGY OF FRESHWATER FISH
LA English
DT Article
DE zooplankton; Copepoda; Brachionus; size-structured interactions;
foraging; development
ID CONNECTED WATERBODIES; FEEDING RELATIONSHIPS; LOWLAND RIVERS; GREEN
RIVER; LARVAL; UTAH; COMMUNITIES; FISHES; FOOD; LAKE
AB Ontogenetic diet shifts are common in fishes and often occur during early life stages. The larval and early juvenile period is critical in the life cycle of the endangered June sucker, Chasmistes liorus (Teleostei: Catostomidae). High larval and juvenile mortality leads to low recruitment to the breeding population and hence a declining natural population. To understand diet composition and dynamics in June sucker at early life stages, diet was quantified and compared to available food items in the natural environment during the early juvenile stage. Rotifers (Brachionus sp.) were the primary diet item at week 10, but by week 12 a small cyclopoid copepod (Microcyclops rubellus) became predominant. Availability of diet items varied little across the experimental period. The increase in size of young suckers may explain this rapid dietary shift, but there are some inconsistencies with the size selection argument. This diet shift represents an important nutritional change that should be considered in development of diets for young June sucker and in assessing suitability of nursery habitats.
C1 [Kreitzer, J. D.; Belk, M. C.; Gonzalez, D. B.; Shiozawa, D. K.; Rasmussen, J. E.] Brigham Young Univ, Dept Biol, Provo, UT 84602 USA.
[Tuckfield, R. C.] Ecostatys, Aiken, SC USA.
[Tuckfield, R. C.] Savannah River Ecol Lab, Aiken, SC USA.
RP Kreitzer, JD (reprint author), Brigham Young Univ, Dept Biol, 401 WIDB, Provo, UT 84602 USA.
EM joshkreitzer@gmail.com
FU Utah Division of Wildlife Resources
FX We thank J. B. Johnson, E. J. Billman and L. S. Belk for helpful
comments on the manuscript. We also thank D. Markle and an anonymous
reviewer for their suggestions which have greatly improved this article.
Our thanks also go to the many undergraduate students who were involved
in identifying and enumerating zooplankton from stomach contents and
availability samples. This research was funded by a grant from the June
Sucker Recovery Implementation Program through the Utah Division of
Wildlife Resources. Permits for experimental work on endangered species
were provided by the Utah Division of Wildlife Resources and the U.S.
Fish and Wildlife Service. Research was approved through the
Institutional Animal Care and Use Committee at Brigham Young University.
NR 28
TC 5
Z9 5
U1 3
U2 9
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0906-6691
J9 ECOL FRESHW FISH
JI Ecol. Freshw. Fish
PD SEP
PY 2010
VL 19
IS 3
BP 433
EP 438
DI 10.1111/j.1600-0633.2010.00427.x
PG 6
WC Fisheries; Marine & Freshwater Biology
SC Fisheries; Marine & Freshwater Biology
GA 639SQ
UT WOS:000280995200012
ER
PT J
AU Hu, SC
Xu, TF
Chaung, T
Chan, DYL
AF Hu, Shih-Cheng
Xu, Tengfang
Chaung, Tony
Chan, David Y. -L.
TI Characterization of energy use in 300 mm DRAM (Dynamic Random Access
Memory) wafer fabrication plants (fabs) in Taiwan
SO ENERGY
LA English
DT Article
DE Energy utilization; Capacity utilization; DRAM; Energy efficiency
AB Driven by technology advances and demand for enhanced productivity, migration of wafer fabrication for DRAM (Dynamic Random Access Memory) toward increased wafer size has become the fast-growing trend in semiconductor industry. Taiwan accounts for about 18% of the total DRAM wafer production in the world. The energy use required for operating wafer fabrication plants (fabs) is intensive and has become one of the major concerns to production power reliability in the island. This paper characterizes the energy use in four 300 mm DRAM wafer fabs in Taiwan through performing surveys and on-site measurements. Specifically, the objectives of this study are to characterize the electric energy consumption and production of 300 mm DRAM fabs by using various performance metrics, including PEI ((production efficiency index), annual electric power consumption normalized by annual produced wafer area) and EUI ((electrical utilization index), annual electric power consumption normalized by UOP (units of production), which is defined as the product of annual produced wafer area and the average number of mask layers of a wafer). The results show that the PEI and EUI values are 0.743 kWh/cm(2) and 0.0272 kWh/UOP, respectively. Using EUI in assessing energy efficiency of the fab production provides more consistent comparisons than using PEI alone. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Hu, Shih-Cheng; Chaung, Tony] Natl Taipei Univ Technol, Dept Energy & Refrigerating Airconditioning Engn, Taipei 106, Taiwan.
[Xu, Tengfang] Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Int Energy Studies Grp, Berkeley, CA USA.
[Chan, David Y. -L.] Ind Technol Res Inst, Energy & Environm Res Labs, Hsinchu, Taiwan.
RP Hu, SC (reprint author), Natl Taipei Univ Technol, Dept Energy & Refrigerating Airconditioning Engn, 1 Sect 3,Chung Hsiao E Rd, Taipei 106, Taiwan.
EM schu.ntut@gmail.com
FU Energy Bureau, Ministry of Economic Affairs, Taiwan; Industrial
Technology Research Institute (ITRI) in Taiwan
FX The authors would like to acknowledge the financial supports from the
Energy Bureau, Ministry of Economic Affairs, Taiwan and Industrial
Technology Research Institute (ITRI) in Taiwan.
NR 12
TC 3
Z9 3
U1 0
U2 0
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0360-5442
EI 1873-6785
J9 ENERGY
JI Energy
PD SEP
PY 2010
VL 35
IS 9
BP 3788
EP 3792
DI 10.1016/j.energy.2010.05.030
PG 5
WC Thermodynamics; Energy & Fuels
SC Thermodynamics; Energy & Fuels
GA 642BM
UT WOS:000281178000032
ER
PT J
AU Kramer, KJ
Meier, WR
Latkowski, JF
Abbott, RP
AF Kramer, K. J.
Meier, W. R.
Latkowski, J. F.
Abbott, R. P.
TI Parameter study of the LIFE engine nuclear design
SO ENERGY CONVERSION AND MANAGEMENT
LA English
DT Article; Proceedings Paper
CT 14th International Conference on Emerging Nuclear Energy Systems
CY JUN 29-JUL 03, 2009
CL Ericeira, PORTUGAL
DE LIFE; Fusion-fission; Hybrid; Nuclear; Inertial; Fusion
ID FISSION ENERGY LIFE; IGNITION; POWER
AB LLNL is developing the nuclear fusion based Laser Inertial Fusion Energy (LIFE) power plant concept. The baseline design uses a depleted uranium (DU) fission fuel blanket with a flowing molten salt coolant (flibe) that also breeds the tritium needed to sustain the fusion energy source. Indirect drive targets, similar to those that will be demonstrated on the National Ignition Facility (NIF), are ignited at similar to 13 Hz providing a 500 MW fusion source. The DU is in the form of a uranium oxycarbide kernel in modified TRISO-like fuel particles distributed in a carbon matrix forming 2-cm-diameter pebbles. The thermal power is held at 2000 MW by continuously varying the (6)Li enrichment in the coolants. There are many options to be considered in the engine design including target yield, U-to-C ratio in the fuel, fission blanket thickness, etc. Here we report results of design variations and compare them in terms of various figures of merit such as time to reach a desired burnup, full-power years of operation, time and maximum burnup at power ramp-down and the overall balance of plant utilization. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Kramer, K. J.; Meier, W. R.; Latkowski, J. F.; Abbott, R. P.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
[Kramer, K. J.] Univ Calif Berkeley, Berkeley, CA 94720 USA.
RP Kramer, KJ (reprint author), Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94551 USA.
EM kramer12@llnl.gov; meier5@llnl.gov
NR 27
TC 5
Z9 6
U1 1
U2 2
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 SEP
PY 2010
VL 51
IS 9
SI SI
BP 1744
EP 1750
DI 10.1016/j.enconman.2009.12.041
PG 7
WC Thermodynamics; Energy & Fuels; Mechanics
SC Thermodynamics; Energy & Fuels; Mechanics
GA 607NP
UT WOS:000278511100002
ER
PT J
AU Botterud, A
Kristiansen, T
Ilic, MD
AF Botterud, Audun
Kristiansen, Tarjei
Ilic, Marija D.
TI The relationship between spot and futures prices in the Nord Pool
electricity market
SO ENERGY ECONOMICS
LA English
DT Article
DE Electricity; Spot markets; Futures prices; Convenience yield; Risk
premium
ID NATURAL-GAS; RISK; PREMIUMS; STORAGE; POWER; COST
AB We analyze 11 years of historical spot- and futures prices from the hydro-dominated Nord Pool electricity market. We find that futures prices tend to be higher than spot prices. The average convenience yield is therefore negative, but varies by season and depends on the storage levels in hydro reservoirs. The average realized return on holding a long position in the futures market is also negative. The negative convenience yield and risk premium contrast empirical findings in most other commodity markets. We argue that differences between the supply and demand sides in terms of risk preferences and the ability to take advantage of short-term price variations can contribute to explain the observed relationship between spot-and futures prices. In addition, our analysis shows that the relationship between spot and futures prices is clearly linked to the physical state of the system, such as hydro inflow, reservoir levels, and demand. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Botterud, Audun] Argonne Natl Lab, Decis & Informat Sci Div, Argonne, IL 60439 USA.
[Kristiansen, Tarjei] RBS Sempra Commod, London, England.
[Ilic, Marija D.] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA.
RP Botterud, A (reprint author), Argonne Natl Lab, Decis & Informat Sci Div, 9700 S Cass Ave, Argonne, IL 60439 USA.
EM abotterud@anl.gov; tarjeikr@yahoo.com; milic@ece.cmu.edu
NR 28
TC 34
Z9 34
U1 2
U2 19
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0140-9883
J9 ENERG ECON
JI Energy Econ.
PD SEP
PY 2010
VL 32
IS 5
BP 967
EP 978
DI 10.1016/j.eneco.2009.11.009
PG 12
WC Economics
SC Business & Economics
GA 670VE
UT WOS:000283454600003
ER
PT J
AU Lekov, AB
Franco, VH
Wong-Parodi, G
McMahon, JE
Chan, P
AF Lekov, Alex B.
Franco, Victor H.
Wong-Parodi, Gabrielle
McMahon, James E.
Chan, Peter
TI Economics of residential gas furnaces and water heaters in US new
construction market
SO ENERGY EFFICIENCY
LA English
DT Article
DE Residential; Gas appliances; Venting; New construction; Life-cycle cost
analysis; Water heating; Space heating
AB New single-family home construction represents a significant and important market for the introduction of energy-efficient gas-fired space heating and water-heating equipment. In the new construction market, the choice of furnace and water-heater type is primarily driven by first cost considerations and the availability of power vent and condensing water heaters. Few analysis have been performed to assess the economic impacts of the different combinations of space and water-heating equipment. Thus, equipment is often installed without taking into consideration the potential economic and energy savings of installing space and water-heating equipment combinations. In this study, we use a life-cycle cost analysis that accounts for uncertainty and variability of the analysis inputs to assess the economic benefits of gas furnace and water-heater design combinations. This study accounts not only for the equipment cost but also for the cost of installing, maintaining, repairing, and operating the equipment over its lifetime. Overall, this study, which is focused on US single-family new construction households that install gas furnaces and storage water heaters, finds that installing a condensing or power-vent water heater together with condensing furnace is the most cost-effective option for the majority of these houses. Furthermore, the findings suggest that the new construction residential market could be a target market for the large-scale introduction of a combination of condensing or power-vent water heaters with condensing furnaces.
C1 [Lekov, Alex B.; Franco, Victor H.; Wong-Parodi, Gabrielle; McMahon, James E.; Chan, Peter] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Lekov, AB (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
EM ABLekov@lbl.gov; VHFranco@lbl.gov; GWong-Parodi@lbl.gov;
JEMcMahon@lbl.gov; PTChan@lbl.gov
NR 22
TC 1
Z9 1
U1 0
U2 4
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1570-646X
J9 ENERG EFFIC
JI Energy Effic.
PD SEP
PY 2010
VL 3
IS 3
BP 203
EP 222
DI 10.1007/s12053-009-9061-y
PG 20
WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels; Environmental
Studies
SC Science & Technology - Other Topics; Energy & Fuels; Environmental
Sciences & Ecology
GA 796QT
UT WOS:000293067400003
ER
PT J
AU Vine, E
Prahl, R
Meyers, S
Turiel, I
AF Vine, Edward
Prahl, Ralph
Meyers, Steve
Turiel, Isaac
TI An approach for evaluating the market effects of energy efficiency
programs
SO ENERGY EFFICIENCY
LA English
DT Article
DE Energy efficiency; Market effects; Market transformation; Evaluation;
Attribution
AB This paper presents work currently being carried out in California on evaluating market effects. We first outline an approach for conducting market effect studies that includes the six key steps that were developed in study plans: (1) a scoping study that characterizes a particular market, reviews relevant market effects studies, develops integrated market and program theories, and identifies market indicators; (2) analysis of market evolution, using existing data sources; (3) analysis of market effects, based on sales data and interviews with key market actors; (4) analysis of attribution; (5) estimation of energy savings; and (6) assessment of sustainability (i.e., the extent to which any observed market effects are likely to persist in the absence or reduction of public intervention, and thus has helped to transform the market). We describe the challenges in conducting this type of analysis (1) selecting a comparison state(s) to California for a baseline, (2) availability and quality of data (limiting analyses), (3) inconsistent patterns of results, and (4) conducting market effects evaluations at one point in time, without the benefit of years of accumulated research findings, and then provide some suggestions for future research on the evaluation of market effects. With the promulgation of market transformation programs, the evaluation of market effects will be critical. We envision that these market effects studies will help lay the foundation for the refinement of techniques for measuring the impacts of programs that seek to transform markets for energy efficiency products and practices.
C1 [Vine, Edward] Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA.
[Vine, Edward] Calif Inst Energy & Environm, Berkeley, CA USA.
[Prahl, Ralph] Panopt Energy Consulting, Madison, WI USA.
[Turiel, Isaac] Northgate Energy Consulting, Berkeley, CA USA.
RP Vine, E (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Environm Energy Technol Div, Bldg 90-4000, Berkeley, CA 94720 USA.
EM elvine@lbl.gov
FU CPUC
FX We want to thank the CPUC for providing support for our work on market
effects, including the following CPUC staff: Tim Drew, Kay Hardy,
Mikhail Haramati, and Ayat Osman. This paper does not necessarily
represent the views of the CPUC or any of its employees. We also want to
acknowledge the following people for their review of an earlier draft:
Harley Barnes, Ryan Barry, Scott Dimetrosky, Kay Hardy, Lynn Hoefgen,
Ken Keating, Lori Medgal, Tim Pettit, Mitch Rosenberg, Ellen Rubinstein,
Bill Steigelmann, and John Stoops. Finally, we thank the anonymous
reviewers for their thoughtful and constructive comments on an earlier
version of this paper.
NR 9
TC 5
Z9 5
U1 0
U2 9
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1570-646X
J9 ENERG EFFIC
JI Energy Effic.
PD SEP
PY 2010
VL 3
IS 3
BP 257
EP 266
DI 10.1007/s12053-009-9070-x
PG 10
WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels; Environmental
Studies
SC Science & Technology - Other Topics; Energy & Fuels; Environmental
Sciences & Ecology
GA 796QT
UT WOS:000293067400006
ER
PT J
AU Salazar, JM
Diwekar, UM
Zitney, SE
AF Salazar, Juan M.
Diwekar, Urmila M.
Zitney, Stephen E.
TI Stochastic Simulation of Pulverized Coal (PC) Processes
SO ENERGY & FUELS
LA English
DT Article
AB An increasing population and electricity demand in the U.S. require capacity expansion of power systems. The National Energy Technology Laboratory (NETL), U.S. Department of Energy (DOE), has invested considerable efforts on research and development to improve the design and simulation of these power plants. Incorporation of novel process synthesis techniques and realistic simulation methodologies yield optimal flowsheet configurations and accurate estimation of their performance parameters. To provide a better estimation of such performance indicators, simulation models should predict the process behavior based on not only deterministic values of well-known input parameters but also uncertain variables associated with simulation assumptions. In this work, the stochastic simulation of a load-following pulverized coal (PC) power plant takes into account the variation of three input variables, namely, atmospheric air temperature, atmospheric air humidity, and generation load. These uncertain variables are characterized with probability density functions (pdfs) obtained from available atmospheric and electrical energy generation data. The stochastic simulation is carried out by obtaining a sample of values from the pdfs that generates a set of scenarios under which the model is run. An efficient sampling technique [Hammersley sequence sampling (HSS)] guarantees a set of scenarios uniformly distributed throughout the uncertain variable range. Then, each model run generates results on performance parameters as cycle efficiency, carbon emissions, sulfur emissions, and water consumption that are statistically analyzed after all runs are completed. Among these parameters, water consumption is of importance because an increasing demand has been observed mostly in arid regions of the country and, therefore, constrains the operability of the processes. This water consumption is significantly affected by atmospheric uncertainties. The original deterministic process model simulation was designed in Aspen Plus, and a CAPE-OPEN compliant stochastic simulation capability is employed to run the uncertainty analysis. Initially, the influences of atmospheric conditions and load change on the performance parameters are analyzed separately to understand their individual influences on the process, and then their simultaneous variation is analyzed to generate more realistic estimations of the process performance.
C1 [Salazar, Juan M.; Diwekar, Urmila M.] VRI, Ctr Uncertain Syst Tools Optimizat & Management, Clarendon Hills, IL 60514 USA.
[Zitney, Stephen E.] US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA.
RP Diwekar, UM (reprint author), VRI, Ctr Uncertain Syst Tools Optimizat & Management, Clarendon Hills, IL 60514 USA.
EM urmila@vri-custom.org
NR 18
TC 3
Z9 3
U1 0
U2 10
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 SEP
PY 2010
VL 24
BP 4961
EP 4970
DI 10.1021/ef100164z
PG 10
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 666JM
UT WOS:000283111000045
ER
PT J
AU Ranjan, S
Sridhar, S
Fruehan, RJ
AF Ranjan, S.
Sridhar, S.
Fruehan, R. J.
TI Reaction of FeS with Simulated Slag and Atmosphere
SO ENERGY & FUELS
LA English
DT Article
ID SYSTEM; PYRITE; IRON
AB Dependent upon the size and density of coal particles used in gasifiers, the resulting ash may contain significant quantities of FeS. It is desirable to have these ash particles react and dissolve in the slag. The rate and rate-controlling reaction of FeS droplets with simplified reactor gas and slags were determined using a confocal scanning laser microscope (CSLM) and a thermogravimetric analyzer (TGA). The shrinking FeS droplets were found to remain at the slag/gas interface for a period and conformed to a lens shape, and size change was attributed to both the reaction and submersion into the slag. Whereas the exact rate could not be determined using the CSLM, the rate increased with increasing CO(2), decreasing FeO in the slag, and was slow in argon. The change in the rate with experimental values is consistent with the hypothesis that the rate is controlled by mass transfer of the product gases, COS and SO(2), away from the particles. TGA results indicated that the measured rate was consistent with the rate computed from the relevant mass-transfer equations and the experimentally determined mass-transfer coefficient. The results indicate that FeS should react, thereby forming FeO, which dissolves in the gasifier slag in a coal gasifier.
C1 [Ranjan, S.; Sridhar, S.; Fruehan, R. J.] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA.
[Ranjan, S.] Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.
[Sridhar, S.] US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA.
RP Ranjan, S (reprint author), Carnegie Mellon Univ, Dept Mat Sci & Engn, 5000 Forbes Ave, Pittsburgh, PA 15213 USA.
EM sranjan@andrew.cmu.edu
FU National Energy Technology Laboratory (NETL) [41817.606.07.02]
FX This work was carried out through the RDS site support contract for
Multiphase Flow Collaboratory Contract 41817.606.07.02 funded by the
Gasification Technology Program at the National Energy Technology
Laboratory (NETL).
NR 12
TC 3
Z9 3
U1 0
U2 8
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 SEP
PY 2010
VL 24
BP 5002
EP 5007
DI 10.1021/ef100541c
PG 6
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 666JM
UT WOS:000283111000049
ER
PT J
AU Fisher, BT
Knothe, G
Mueller, CJ
AF Fisher, Brian T.
Knothe, Gerhard
Mueller, Charles J.
TI Liquid-Phase Penetration under Unsteady In-Cylinder Conditions: Soy- and
Cuphea-Derived Biodiesel Fuels Versus Conventional Diesel
SO ENERGY & FUELS
LA English
DT Article
ID DISTILLATION CURVE METHOD; CONTINUOUS THERMODYNAMICS; DROPLET
VAPORIZATION; IMPROVEMENTS; MODEL; OIL; MIXTURES; GASOLINE; ENGINE;
TEMPERATURE
AB Accelerated dilution of engine lubrication oil with unburned fuel is a significant potential issue when utilizing fuels that contain biodiesel. Biodiesel produced from some feedstocks is less volatile than conventional diesel, which makes wall impingement of liquid fuel more likely and reduces the ability of the fuel to evaporate out of engine oil once dilution has occurred. These are growing concerns, particularly with the emergence of strategies that involve injection of fuel into relatively cool, low-density, in-cylinder gases. Examples of these strategies include early direct-injection and late-cycle post-injection, which facilitate partially premixed low-temperature combustion and aftertreatment system regeneration, respectively. A quantitative understanding of liquid-phase penetration for biodiesel fuels is needed to help mitigate these potential issues. This work reports liquid penetration lengths measured in an optical engine under time-varying in-cylinder conditions for soy- and cuphea-derived biodiesel fuels (soy methyl esters = SME and cuphea methyl esters = CuME, respectively) and a commercial ultralow-sulfur diesel (ULSD). Experiments included laser light scattering for measurement of the liquid length and cylinder-pressure data acquisition for heat-release analysis. Data were acquired for multiple injection pressures, intake-manifold pressures, and injection timings for each fuel. SME and CuME both were found to have similar to 20-30% longer liquid lengths than U LSD, despite a large concentration of higher-volatility components in CuME. Compared to ULSD and SME, however, CuME liquid lengths were more dependent on injection timing. Results suggest that early direct-injection and late-cycle post-injection strategies may benefit from the use of CuME vs SME.
C1 [Fisher, Brian T.; Mueller, Charles J.] Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA.
[Knothe, Gerhard] ARS, Natl Ctr Agr Utilizat Res, USDA, Peoria, IL 61604 USA.
RP Fisher, BT (reprint author), Sandia Natl Labs, Combust Res Facil, Livermore, CA 94551 USA.
EM btfishe@sandia.gov
FU U.S. Department of Energy, Office of Vehicle Technologies; U.S.
Department of Energy's National Nuclear Security Administration
[DE-AC04-94AL85000]
FX Funding for this research was provided by the U.S. Department of Energy,
Office of Vehicle Technologies. We thank program manager Kevin Stork for
supporting this study. The research was conducted at the Combustion
Research Facility, Sandia National Laboratories (Livermore, California).
Sandia is a multiprogram laboratory operated by Sandia Corporation, a
Lock-heed Martin Company, for the U.S. Department of Energy's National
Nuclear Security Administration under contract DE-AC04-94AL85000. We
also gratefully acknowledge Kevin R. Steidley (USDA/ARS/NCAUR) for
skillfully synthesizing the cuphea methylesters.
NR 85
TC 28
Z9 28
U1 0
U2 13
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 SEP
PY 2010
VL 24
BP 5163
EP 5180
DI 10.1021/ef100594p
PG 18
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 666JM
UT WOS:000283111000067
ER
PT J
AU Smith, EA
Lee, YJ
AF Smith, Erica A.
Lee, Young Jin
TI Petroleomic Analysis of Bio-oils from the Fast Pyrolysis of Biomass:
Laser Desorption Ionization-Linear Ion Trap-Orbitrap Mass Spectrometry
Approach
SO ENERGY & FUELS
LA English
DT Article
ID WATER-INSOLUBLE FRACTION; LIGNIN; RESONANCE; BIOFUEL; MS
AB Fast pyrolysis of biomass produces bio-oils that can be upgraded into biofuels. Despite similar physical properties to petroleum, the chemical properties of bio-oils are quite different and their chemical compositions, particularly those of non-volatile compounds, are not well-known. Here, we report the first time attempt at analyzing bio-oils using high-resolution mass spectrometry (MS), which employed laser desorption ionization-linear ion trap-Orbitrap MS. Besides a few limitations, we could determine chemical compositions for over 100 molecular compounds in a bio-oil sample produced from the pyrolysis of a loblolly pine tree. These compounds consist of 3-6 oxygens and 9-17 double-bond equivalents (DBEs). Among those, O(4) compounds with a DBE of 9-13 were most abundant. Unlike petroleum oils, the lack of nearby molecules within a +/- 2 Da mass window for major components enabled clear isolation of precursor ions for subsequent MS/MS structural investigations. Petroleomic analysis and a comparison to low-mass components in hydrolytic lignin suggest that they are dimers and trimers of depolymerized lignin.
C1 [Lee, Young Jin] Iowa State Univ, US DOE, Ames Lab, Ames, IA 50011 USA.
Iowa State Univ, Dept Chem, 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 Lee, Young Jin/F-2317-2011
OI Lee, Young Jin/0000-0002-2533-5371
FU Iowa State University and Ames Laboratory, U.S. DOE; ConocoPhillips;
U.S. Department of Education
FX This work was supported by grants from Iowa State University and Ames
Laboratory, U.S. DOE, and partially supported by ConocoPhillips. The
authors thank Robert C. Brown, Center for Sustainable Environmental
Technology at Iowa State University, for bio-oil samples and valuable
discussions and Christopher J. Thompson at Bruker for LDI-FT ICR
analysis of bio-oils. E.A.S. acknowledges a Graduate Assistance in Areas
of National Need (GAANN) fellowship from the U.S. Department of
Education.
NR 29
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U1 6
U2 28
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 SEP
PY 2010
VL 24
BP 5190
EP 5198
DI 10.1021/ef100629a
PG 9
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 666JM
UT WOS:000283111000069
ER
PT J
AU Jones, RW
Reinot, T
McClelland, JF
AF Jones, Roger W.
Reinot, Tonu
McClelland, John F.
TI Molecular Analysis of Primary Vapor and Char Products during Stepwise
Pyrolysis of Poplar Biomass
SO ENERGY & FUELS
LA English
DT Article
ID 2-DIMENSIONAL GAS-CHROMATOGRAPHY; WOOD; LIGNIN; COMPONENTS; OIL;
IDENTIFICATION; SPECTROSCOPY; DEGRADATION; TEMPERATURE; CELLULOSE
AB Pyrolysis of biomass produces both pyrolysis oil and solid char. In this study, poplar has been pyrolyzed in a stepwise fashion over a series of temperatures from 200 to 500 degrees C, and both the primary products contributing to pyrolysis oil and the changes in the pyrolyzing poplar surface leading toward char have been characterized at each step. The primary products were identified by direct analysis in real time (DART) mass spectrometry, and the changes in the poplar surface were monitored using Fourier transform infrared (FTIR) photoacoustic spectroscopy, with a sampling depth of a few micrometers. The primary products from pyrolyzing cellulose, xylan, and lignin under similar conditions were also characterized to identify the sources of the poplar products.
C1 [Jones, Roger W.] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA.
Iowa State Univ, Ctr Sustainable Environm Technol, Ames, IA 50011 USA.
RP Jones, RW (reprint author), Iowa State Univ, Ames Lab, US DOE, 109 Spedding Hall, Ames, IA 50011 USA.
EM jonesrw@ameslab.gov
FU Office of Science, Office of Basic Energy Sciences, of the U.S.
Department of Energy [DE-AC02-07CH11358]; U.S. Department of Energy;
ConocoPhillips Company
FX This work was performed at Ames Laboratory, which is supported by the
Office of Science, Office of Basic Energy Sciences, of the U.S.
Department of Energy, under Contract DE-AC02-07CH11358 with the U.S.
Department of Energy. This work was funded in part by the ConocoPhillips
Company. We thank Dr. Monlin Kuo of Iowa State University for supplying
the powdered and slab poplar used in this study.
NR 32
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U1 3
U2 30
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 SEP
PY 2010
VL 24
BP 5199
EP 5209
DI 10.1021/ef100655n
PG 11
WC Energy & Fuels; Engineering, Chemical
SC Energy & Fuels; Engineering
GA 666JM
UT WOS:000283111000070
ER
PT J
AU Raugei, M
Fthenakis, V
AF Raugei, Marco
Fthenakis, Vasilis
TI Cadmium flows and emissions from CdTe PV: future expectations
SO ENERGY POLICY
LA English
DT Article
DE Cadmium telluride photovoltaics; Cadmium; Prospective analysis
AB Cadmium telluride photovoltaic (CdTe PV) technology is growing rapidly, and already represents the largest contributor to non-silicon based photovoltaics worldwide. We assessed the extent to which CdTe PV will play a notable role in the Cd use and emission flows in the future, and whether it will be environmentally beneficial or detrimental. Our results show that while CdTe PV may account for a large percentage of future global Cd demand, its role in terms of Cd sequestration may be beneficial. We calculated that its potential contribution to yearly global Cd emissions to air and water may well be orders-of-magnitude lower than the respective current Cd emissions rates in Europe. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Raugei, Marco] Pompeu Fabra Univ, Int Trade Business Sch ESCI, Environm Management Res Grp GiGa, Barcelona 08003, Spain.
[Fthenakis, Vasilis] Columbia Univ, New York, NY 10027 USA.
[Fthenakis, Vasilis] Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Raugei, M (reprint author), Pompeu Fabra Univ, Int Trade Business Sch ESCI, Environm Management Res Grp GiGa, Barcelona 08003, Spain.
EM marco.raugei@esci.es
RI Raugei, Marco/N-4737-2015
OI Raugei, Marco/0000-0001-5026-8556
NR 24
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U1 0
U2 4
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 SEP
PY 2010
VL 38
IS 9
BP 5223
EP 5228
DI 10.1016/j.enpol.2010.05.007
PG 6
WC Energy & Fuels; Environmental Sciences; Environmental Studies
SC Energy & Fuels; Environmental Sciences & Ecology
GA 623MD
UT WOS:000279743500044
ER
PT J
AU Kaufman, AS
Meier, PJ
Sinistore, JC
Reinemann, DJ
AF Kaufman, Andrew S.
Meier, Paul J.
Sinistore, Julie C.
Reinemann, Douglas J.
TI Applying life-cycle assessment to low carbon fuel standards-How
allocation choices influence carbon intensity for renewable
transportation fuels
SO ENERGY POLICY
LA English
DT Article
DE LCA; Ethanol; Bioenergy
ID ETHANOL; ENERGY; CORN; LCA; AGRICULTURE; EMISSIONS; SYSTEM
AB The Energy Independence and Security Act (EISA) of 2007 requires life-cycle assessment (LCA) for quantifying greenhouse gas emissions (GHGs) from expanded U.S. biofuel production. To qualify under the Renewable Fuel Standard, cellulosic ethanol and new corn ethanol must demonstrate 60% and 20% lower emissions than petroleum fuels, respectively. A combined corn-grain and corn-stover ethanol system could potentially satisfy a major portion of renewable fuel production goals. This work examines multiple LCA allocation procedures for a hypothetical system producing ethanol from both corn grain and corn stover. Allocation choice is known to strongly influence GHG emission results for corn-ethanol. Stover-derived ethanol production further complicates allocation practices because additional products result from the same corn production system. This study measures the carbon intensity of ethanol fuels against EISA limits using multiple allocation approaches. Allocation decisions are shown to be paramount. Under varying approaches, carbon intensity for corn ethanol was 36-79% that of gasoline, while carbon intensity for stover-derived ethanol was -10% to 44% that of gasoline. Producing corn-stover ethanol dramatically reduced carbon intensity for corn-grain ethanol, because substantially more ethanol is produced with only minor increases in emissions. Regulatory considerations for applying LCA are discussed. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Kaufman, Andrew S.; Meier, Paul J.; Sinistore, Julie C.; Reinemann, Douglas J.] Univ Wisconsin, Great Lakes Bioenergy Res Ctr, Madison, WI 53706 USA.
[Meier, Paul J.] Univ Wisconsin, Energy Inst, Madison, WI 53706 USA.
RP Meier, PJ (reprint author), Univ Wisconsin, Great Lakes Bioenergy Res Ctr, 3529 Microbial Sci,1550 Linden Dr, Madison, WI 53706 USA.
EM pmeier@wisc.edu
FU U.S. Department of Energy, Office of Science, Office of Biological and
Environmental Research [DE-FC02-07ER64494]
FX This work was part of the DOE Great Lakes Bioenergy Research Center
(www.greatlakesbioenergy.org) supported by the U.S. Department of
Energy, Office of Science, Office of Biological and Environmental
Research, through Cooperative Agreement DE-FC02-07ER64494 between The
Board of Regents of the University of Wisconsin System and the U.S.
Department of Energy. We thank R. Cesar Izaurralde, Joint Global Change
Research Institute, for the biogeochemical modeling of feedstock
production which provides valuable input to this work.
NR 46
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U1 2
U2 25
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 SEP
PY 2010
VL 38
IS 9
BP 5229
EP 5241
DI 10.1016/j.enpol.2010.05.008
PG 13
WC Energy & Fuels; Environmental Sciences; Environmental Studies
SC Energy & Fuels; Environmental Sciences & Ecology
GA 623MD
UT WOS:000279743500045
ER
PT J
AU Wang, Z
Jin, YF
Wang, M
Wu, W
AF Wang, Zhao
Jin, Yuefu
Wang, Michael
Wu, Wei
TI New fuel consumption standards for Chinese passenger vehicles and their
effects on reductions of oil use and CO2 emissions of the Chinese
passenger vehicle fleet
SO ENERGY POLICY
LA English
DT Article
DE Passenger vehicle; Fuel economy; Oil savings
AB A new fuel consumption standard for passenger vehicles in China, the so-called Phase 3 standard, was approved technically in 2009 and will take effect in 2012. This standard aims to introduce advanced energy-saving technologies into passenger vehicles and to reduce the average fuel consumption rate of Chinese new passenger vehicle fleet in 2015 to 7 L/100 km. The Phase 3 standard follows the evaluating system by specifying fuel consumption targets for sixteen individual mass-based classes. Different from compliance with the Phases 1 and 2 fuel consumption standards, compliance of the Phase 3 standard is based on corporate average fuel consumption (CAFC) rates for individual automobile companies. A transition period from 2012 to 2014 is designed for manufacturers to gradually adjust their production plans and introduce fuel-efficient technologies. In this paper, we, the designers of the Phase 3 standard, present the design of the overall fuel consumption reduction target, technical feasibility, and policy implications of the Phase 3 standard. We also explore several enforcement approaches for the Phase 3 standard with financial penalties of non-compliance as a priority. Finally, we estimate the overall effect of the Phase 3 standard on oil savings and CO2 emission reductions. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Wang, Zhao; Jin, Yuefu; Wu, Wei] CATARC, Tianjin 300162, Peoples R China.
[Wang, Michael] Argonne Natl Lab, Ctr Transportat Res, Argonne, IL 60439 USA.
RP Wang, Z (reprint author), CATARC, 218 Chenglin Rd, Tianjin 300162, Peoples R China.
EM wangzhao_sd@126.com
FU Energy Foundation
FX We thank Mr. Huiming Gong of the China Sustainable Energy Program of the
Energy Foundation for his support of this study and the Drafting Group
of the New Chinese Fuel Consumption Standard for Passenger vehicles for
their inputs during development of the Phase 3 standard. We are also
grateful to the two anonymous reviewers for their helpful comments.
NR 13
TC 33
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U1 2
U2 9
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 SEP
PY 2010
VL 38
IS 9
BP 5242
EP 5250
DI 10.1016/j.enpol.2010.05.012
PG 9
WC Energy & Fuels; Environmental Sciences; Environmental Studies
SC Energy & Fuels; Environmental Sciences & Ecology
GA 623MD
UT WOS:000279743500046
ER
PT J
AU Marzouk, OA
Huckaby, ED
AF Marzouk, Osama A.
Huckaby, E. David
TI A COMPARATIVE STUDY OF EIGHT FINITE-RATE CHEMISTRY KINETICS FOR CO/H-2
COMBUSTION
SO ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
LA English
DT Article
DE chemistry kinetics; reaction mechanisms; syngas; nonpremixed flame; ODE
solver; CFD
ID CARBON MONOXIDE/HYDROGEN MIXTURES; SYNGAS COMBUSTION; FLAME STRUCTURE;
JET FLAMES; TURBULENT; SIMULATION; IGNITION; MODEL; FLOW
AB We compare the performance and computational cost of 8 kinetic models (3 global and 5 elementary) that describe the finite-rate chemistry of syngas combustion. We apply them in simulating a turbulent jet flame with syngas diluted by 30% nitrogen. We model the turbulence by a modified k-epsilon model and the turbulence-chemistry interaction by the partially stirred reactor approach. To integrate the chemistry equations, we nominally use explicit fifth-order embedded Runge-Kutta ODE solver. But semi-implicit Bulirsch-Stoer and implicit Euler were also used. The computational time depends on the number of reaction steps and the ODE solver. Five models overpredict the maximum flame temperature (by 200 K-320 K). Two models underpredict it by 240 K and 580 K. The global model that is based on the Westbrook-Dryer (1981) model for hydrocarbon fuels gives the best agreement with measurements, and also has low computational demand. Therefore, it is recommended for modeling turbulent syngas flames.
C1 [Marzouk, Osama A.; Huckaby, E. David] US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA.
RP Marzouk, OA (reprint author), US DOE, Natl Energy Technol Lab, 3610 Collins Ferry Rd,POB 880, Morgantown, WV 26507 USA.
EM omarzouk@vt.edu
FU U.S. DOE
FX The support of this work by U.S. DOE Existing Plants Emissions and
Capture program is gratefully acknowledged. The first author was
supported in part by an appointment to the U.S. Department of Energy
(DOE) Postgraduate Research Program at the National Energy Technology
Laboratory administered by the Oak Ridge Institute for Science and
Education.
NR 50
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Z9 22
U1 1
U2 13
PU HONG KONG POLYTECHNIC UNIV, DEPT CIVIL & STRUCTURAL ENG
PI HONG KONG
PA HUNG HOM, KOWLOON, HONG KONG, 00000, PEOPLES R CHINA
SN 1994-2060
J9 ENG APPL COMP FLUID
JI Eng. Appl. Comp. Fluid Mech.
PD SEP
PY 2010
VL 4
IS 3
BP 331
EP 356
PG 26
WC Engineering, Multidisciplinary; Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA 649DH
UT WOS:000281747100001
ER
PT J
AU Quinn, NWT
Ortega, R
Rahilly, PJA
Royer, CW
AF Quinn, Nigel W. T.
Ortega, Ricardo
Rahilly, Patrick J. A.
Royer, Caleb W.
TI Use of environmental sensors and sensor networks to develop water and
salinity budgets for seasonal wetland real-time water quality management
SO ENVIRONMENTAL MODELLING & SOFTWARE
LA English
DT Article
DE Salt management; Sensors; Sensor networks; Water quality; Forecasting;
Environmental decision support
ID SOIL ELECTRICAL-CONDUCTIVITY; SPATIAL VARIABILITY; DECISION-SUPPORT;
CALIFORNIA; SALT; TOOL
AB Management of river salt loads in a complex and highly regulated river basin such as the San Joaquin River Basin of California presents significant challenges for current Information Technology. Computer-based numerical models are used as a means of simulating hydrologic processes and water quality within the basin and can be useful tools for organizing Basin data in a structured and readily accessible manner. These models can also be used to extend information derived from environmental sensors within existing monitoring networks to areas outside these systems based on similarity factors - since it would be cost prohibitive to collect data for every channel or pollutant source within the Basin. A common feature of all hydrologic and water quality models is the ability to perform mass balances. This paper describes the use of a number of state-of-the-art sensor technologies that have been deployed to obtain water and salinity mass balances for a 60,000 ha tract of seasonally managed wetlands in the San Joaquin River Basin of California. These sensor technologies are being combined with more traditional environmental monitoring techniques to support real-time salinity management (RTSM) in the River Basin. Two of these new technology applications: YSI-Econet (which supports continuous flow and salinity monitoring of surface water deliveries and seasonal wetland drainage); and electromagnetic salinity mapping (a remote sensing technology for mapping soil salinity in the surface soils) - have not previously been reported in the literature. Continuous sensor deployments that experience more widespread use include: weather station sensor arrays - used to estimate wetland pond evaporation and moist soil plant evapotranspiration; high resolution multi-spectral imagery - used to discriminate between and estimate the area of wetland moist soil plant vegetation: and groundwater level sensors - used primarily to estimate seepage losses beneath a wetland pond during flood-up. Important issues associated with quality assurance of continuous data are discussed and the application of a state-of-the-art software product AQUARIUS, which streamlines the process of data error correction and dissemination, is described as an essential element of ensuring successful RTSM implementation in the San Joaquin River Basin. (C) 2009 Elsevier Ltd. All rights reserved.
C1 [Quinn, Nigel W. T.; Royer, Caleb W.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Ortega, Ricardo] Dept Fish & Game, Los Banos, CA USA.
[Quinn, Nigel W. T.] US Bur Reclamat, Washington, DC 20240 USA.
RP Quinn, NWT (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA.
EM nwquinn@lbl.gov
RI Quinn, Nigel/G-2407-2015
OI Quinn, Nigel/0000-0003-3333-4763
FU California State Water Resources Control Board; U.S. Bureau of
Reclamation Science and Technology Program; California Department of
Water Resources; Grassland Water District; California Department of Fish
and Game; US Bureau of Reclamation, California Department of Water
Resources; California Regional Water Quality Control Board
FX This work was supported by the California State Water Resources Control
Board, the U.S. Bureau of Reclamation Science and Technology Program and
the California Department of Water Resources. The authors would like to
thank the US Bureau of Reclamation, California Department of Water
Resources and California Regional Water Quality Control Board who have
funded associated research projects over the past decade directed at
implementing RTSM in the San Joaquin Basin of California. Thanks also to
the Grassland Water District and the California Department of Fish and
Game who provide in-kind support to current projects within the GEA. YSI
Inc. has provided valuable technical support for deployment of the
YSI-ECONET technology in California.
NR 39
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Z9 19
U1 5
U2 31
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 1364-8152
J9 ENVIRON MODELL SOFTW
JI Environ. Modell. Softw.
PD SEP
PY 2010
VL 25
IS 9
BP 1045
EP 1058
DI 10.1016/j.envsoft.2009.10.011
PG 14
WC Computer Science, Interdisciplinary Applications; Engineering,
Environmental; Environmental Sciences
SC Computer Science; Engineering; Environmental Sciences & Ecology
GA 613OM
UT WOS:000278988600008
ER
PT J
AU Hesbach, PA
Kim, AG
Abel, ASP
Lamey, SC
AF Hesbach, Peter A.
Kim, Ann G.
Abel, Alexander S. P.
Lamey, Steven C.
TI Serial batch leaching procedure for characterization of coal fly ash
SO ENVIRONMENTAL MONITORING AND ASSESSMENT
LA English
DT Article
DE Ash characterization; Fly ash; Leaching method
ID TRACE-ELEMENTS; ENVIRONMENTAL-IMPACT; WASTE MATERIALS; METAL RELEASE;
BOTTOM ASH; LEACHABILITY; COMBUSTION; TESTS; AVAILABILITY; MANAGEMENT
AB Although many leaching methods have been used for various purposes by research groups, industries, and regulators, there is still a need for a simple but comprehensive approach to leaching coal utilization by-products and other granular materials in order to estimate potential release of heavy metals when these materials are exposed to natural fluids. A serial batch characterization method has been developed at the National Energy Technology Laboratory that can be completed in 2-3 days to serve as a screening tool. The procedure provides an estimate of cumulative metals release under varying pH conditions, and leaching the sample at increasing liquid/solid ratios can indicate the rate at which this process will occur. This method was applied to eight fly ashes, adapted to the acidic or alkaline nature of the ash. The leachates were analyzed for 30 elements. The test was run in quadruplicate, and the relative standard deviation (RSD) was used as a measure of method reproducibility. RSD values are between 0.02 and 0.70, with the majority of the RSD values less than 0.3. The serial batch leaching procedure was developed as a simple, relatively quick, yet comprehensive method of estimating the risk of heavy metal release from fly ash when it is exposed to natural fluids, such as acid rain or groundwater. Tests on a random selection of coal fly ashes have shown it to be a reasonably precise method for estimating the availability and long-term release of cations from fly ash.
C1 [Hesbach, Peter A.; Lamey, Steven C.] US DOE, Natl Energy Technol Lab, Morgantown, WV 26507 USA.
[Kim, Ann G.] US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA.
[Abel, Alexander S. P.] LLC, NETL Res & Dev Solut, Morgantown, WV USA.
RP Hesbach, PA (reprint author), US DOE, Natl Energy Technol Lab, 3610 Collins Ferry Rd,POB 880, Morgantown, WV 26507 USA.
EM peter.hesbach@netl.doe.gov
FU Electric Power Research Institute
FX The authors would like to extend their appreciation to the Electric
Power Research Institute for partial financial support for this work and
to Robert Thompson (NETL, RDS/Parsons) for performing the metals
analyses.
NR 40
TC 5
Z9 5
U1 1
U2 14
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0167-6369
J9 ENVIRON MONIT ASSESS
JI Environ. Monit. Assess.
PD SEP
PY 2010
VL 168
IS 1-4
BP 523
EP 545
DI 10.1007/s10661-009-1132-1
PG 23
WC Environmental Sciences
SC Environmental Sciences & Ecology
GA 635FH
UT WOS:000280640500046
PM 19690972
ER
PT J
AU Weyens, N
Truyens, S
Dupae, J
Newman, L
Taghavi, S
van der Lelie, D
Carleer, R
Vangronsveld, J
AF Weyens, Nele
Truyens, Sascha
Dupae, Joke
Newman, Lee
Taghavi, Safiyh
van der Lelie, Daniel
Carleer, Robert
Vangronsveld, Jaco
TI Potential of the TCE-degrading endophyte Pseudomonas putida W619-TCE to
improve plant growth and reduce TCE phytotoxicity and evapotranspiration
in poplar cuttings
SO ENVIRONMENTAL POLLUTION
LA English
DT Article
DE Pseudomonas putida W619-TCE; Endophyte; Trichloroethylene;
Phytoremediation; Poplar
ID PHYTOREMEDIATION; BACTERIA; RHIZOBACTERIA; L.
AB The TCE-degrading poplar endophyte Pseudomonas putida W619-TCE was inoculated in poplar cuttings, exposed to 0, 200 and 400 mg l(-1) TCE, that were grown in two different experimental setups. During a short-term experiment, plants were grown hydroponically in half strength Hoagland nutrient solution and exposed to ICE for 3 days. Inoculation with P. putida W619-TCE promoted plant growth, reduced TCE phytotoxicity and reduced the amount of TCE present in the leaves. During a mid-term experiment, plants were grown in potting soil and exposed to TCE for 3 weeks. Here, inoculation with P. putida W619-TCE had a less pronounced positive effect on plant growth and ICE phytotoxicity, but resulted in strongly reduced amounts of ICE in leaves and roots of plants exposed to 400 mg l(-1) TCE, accompanied by a lowered evapotranspiration of TCE. Dichloroacetic acid (DCAA) and trichloroacetic acid (TCAA), which are known intermediates of TCE degradation, were not detected. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Weyens, Nele; Truyens, Sascha; Dupae, Joke; Carleer, Robert; Vangronsveld, Jaco] Hasselt Univ, Ctr Environm Sci, B-3590 Diepenbeek, Belgium.
[Newman, Lee; Taghavi, Safiyh; van der Lelie, Daniel] Brookhaven Natl Lab, Dept Biol, Upton, NY 11973 USA.
RP Vangronsveld, J (reprint author), Hasselt Univ, Ctr Environm Sci, Agoralaan Bldg D, B-3590 Diepenbeek, Belgium.
EM jaco.vangronsveld@uhasselt.be
FU Institute for the Promotion of Innovation through Science and Technology
in Flanders (IWT-Vlaanderen); UHasselt Methusalem [08M03VGRJ]; U.S.
Department of Energy at the Brookhaven National Laboratory [LDRD05-063,
LDRD09-005]
FX This research was funded by the Institute for the Promotion of
Innovation through Science and Technology in Flanders (IWT-Vlaanderen)
for N.W. and for J.D. This work was also supported by the UHasselt
Methusalem project 08M03VGRJ. Work by D.v.d.L. and L.N. was funded by
Laboratory Directed Research and Development funds (LDRD05-063 and
LDRD09-005) at the Brookhaven National Laboratory under contract with
the U.S. Department of Energy.
NR 16
TC 38
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U1 2
U2 26
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 SEP
PY 2010
VL 158
IS 9
BP 2915
EP 2919
DI 10.1016/j.envpol.2010.06.004
PG 5
WC Environmental Sciences
SC Environmental Sciences & Ecology
GA 643OL
UT WOS:000281306400016
PM 20598789
ER
PT J
AU Martin, I
Panagopoulos, C
AF Martin, Ivar
Panagopoulos, C.
TI Nernst effect and diamagnetic response in a stripe model of
superconducting cuprates
SO EPL
LA English
DT Article
ID PHASE; FLUCTUATIONS; BI2SR2CACU2O8+DELTA; PSEUDOGAP; MAGNETISM
AB We examine the possibility that the experimentally observed enhancement of superconducting (SC) fluctuations above the SC transition temperature in the underdoped cuprates is caused by stripes -an intrinsic electronic inhomogeneity, common to hole-doped cuprates. By evaluating the strengths of the diamagnetic response and the Nernst effect within a striped SC model, we find results that are qualitatively consistent with the experimental observations (WANG YAYU et al., Phys. Rev. B, 73 (2006) 024510). We make a prediction for anisotropic thermopower in detwinned samples that can be used to further test the proposed scenario. Copyright (C) EPLA, 2010
C1 [Martin, Ivar] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Panagopoulos, C.] Univ Crete, Dept Phys, Iraklion 71003, Greece.
[Panagopoulos, C.] FORTH, Iraklion 71003, Greece.
[Panagopoulos, C.] Nanyang Technol Univ, Div Phys & Appl Phys, Sch Phys & Math Sci, Singapore 6373616, Singapore.
RP Martin, I (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
EM i-martin@lanl.gov
RI PANAGOPOULOS, CHRISTOS/G-8754-2011
FU National Nuclear Security Administration of the U. S. Department of
Energy at Los Alamos National Laboratory [DE-AC52-06NA25396]; LANL/LDRD;
EURYI; National Research Foundation, Singapore; [MEXT-CT-2006-039047]
FX We acknowledge useful discussions with C. KALLIN, D. VAN DER MAREL, and
D. PODOLSKY, and thank Aspen Center for Physics, where this work was
initiated, for hospitality. The work of IM was carried out under the
auspices of the National Nuclear Security Administration of the U. S.
Department of Energy at Los Alamos National Laboratory under Contract
No. DE-AC52-06NA25396 and supported by the LANL/LDRD Program. CP
acknowledges financial support from MEXT-CT-2006-039047, EURYI and the
National Research Foundation, Singapore.
NR 33
TC 7
Z9 7
U1 0
U2 8
PU EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
PI MULHOUSE
PA 6 RUE DES FRERES LUMIERE, MULHOUSE, 68200, FRANCE
SN 0295-5075
EI 1286-4854
J9 EPL-EUROPHYS LETT
JI EPL
PD SEP
PY 2010
VL 91
IS 6
AR 67001
DI 10.1209/0295-5075/91/67001
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 674BO
UT WOS:000283708700021
ER
PT J
AU Wang, SK
Mamontov, E
Bai, M
Hansen, FY
Taub, H
Copley, JRD
Sakai, VG
Gasparovic, G
Jenkins, T
Tyagi, M
Herwig, KW
Neumann, DA
Montfrooij, W
Volkmann, UG
AF Wang, S. -K.
Mamontov, E.
Bai, M.
Hansen, F. Y.
Taub, H.
Copley, J. R. D.
Sakai, V. Garcia
Gasparovic, G.
Jenkins, T.
Tyagi, M.
Herwig, K. W.
Neumann, D. A.
Montfrooij, W.
Volkmann, U. G.
TI Localized diffusive motion on two different time scales in solid alkane
nanoparticles
SO EPL
LA English
DT Article
ID ELASTIC NEUTRON-SCATTERING; X-RAY-SCATTERING; MOLECULAR-MOTION; SIO2
SURFACE; FILMS; TRITRIACONTANE; SPECTROMETER; PARAFFINS; N-C33H68;
PHASES
AB High-energy-resolution quasielastic neutron scattering on three complementary spectrometers has been used to investigate molecular diffusive motion in solid nano- to bulk-sized particles of the alkane n-C32H66. The crystalline-to-plastic and plastic-to-fluid phase transition temperatures are observed to decrease as the particle size decreases. In all samples, localized molecular diffusive motion in the plastic phase occurs on two different time scales: a "fast" motion corresponding to uniaxial rotation about the long molecular axis; and a "slow" motion attributed to conformational changes of the molecule. Contrary to the conventional interpretation in bulk alkanes, the fast uniaxial rotation begins in the low-temperature crystalline phase. Copyright (C) EPLA, 2010
C1 [Wang, S. -K.; Bai, M.; Hansen, F. Y.; Taub, H.; Montfrooij, W.] Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA.
[Wang, S. -K.; Bai, M.; Hansen, F. Y.; Taub, H.; Montfrooij, W.] Univ Missouri, Univ Missouri Res Reactor, Columbia, MO 65211 USA.
[Mamontov, E.; Herwig, K. W.] Oak Ridge Natl Lab, Spallat Neutron Source, Oak Ridge, TN 37831 USA.
[Copley, J. R. D.; Sakai, V. Garcia; Gasparovic, G.; Jenkins, T.; Tyagi, M.; Neumann, D. A.] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA.
[Sakai, V. Garcia; Tyagi, M.] Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA.
[Volkmann, U. G.] Pontificia Univ Catolica Chile, Fac Fis, Santiago 22, Chile.
[Wang, S. -K.] Ctr Comprehens Canc, Palm Springs, CA 92263 USA.
[Hansen, F. Y.] Tech Univ Denmark, Dept Chem, DK-2800 Lyngby, Denmark.
RP Wang, SK (reprint author), Univ Missouri, Dept Phys & Astron, Columbia, MO 65211 USA.
EM taubh@missouri.edu
RI Herwig, Kenneth/F-4787-2011; Volkmann, Ulrich/H-1802-2014; Tyagi, Madhu
Sudan/M-4693-2014; Mamontov, Eugene/Q-1003-2015
OI Tyagi, Madhu Sudan/0000-0002-4364-7176; Mamontov,
Eugene/0000-0002-5684-2675
FU U.S. National Science Foundation [DMR-0705974]; NSF [DMR-0454672];
Scientific User Facilities Division, Office of Basic Energy Sciences,
U.S. Department of Energy
FX This work was supported by the U.S. National Science Foundation under
Grant No. DMR-0705974 and utilized facilities supported in part by the
NSF under agreement No. DMR-0454672. A portion of this research at Oak
Ridge National Laboratory's Spallation Neutron Source was sponsored by
the Scientific User Facilities Division, Office of Basic Energy
Sciences, U.S. Department of Energy. We thank C. M. Brown for useful
discussions.
NR 22
TC 7
Z9 7
U1 0
U2 5
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 SEP
PY 2010
VL 91
IS 6
AR 66007
DI 10.1209/0295-5075/91/66007
PG 6
WC Physics, Multidisciplinary
SC Physics
GA 674BO
UT WOS:000283708700018
ER
PT J
AU Wille, HC
Hermann, RP
Sergueev, I
Pelzer, U
Mochel, A
Claudio, T
Persson, J
Ruffer, R
Said, A
Shvyd'ko, YV
AF Wille, H. -C.
Hermann, R. P.
Sergueev, I.
Pelzer, U.
Moechel, A.
Claudio, T.
Persson, J.
Rueffer, R.
Said, A.
Shvyd'ko, Yu. V.
TI Nuclear forward and inelastic spectroscopy on Te-125 and (Sb2Te3)-Te-125
SO EPL
LA English
DT Article
ID RESONANT SCATTERING EXPERIMENTS; DENSITY-OF-STATES;
SYNCHROTRON-RADIATION; PHONON DENSITY; X-RAYS; MOSSBAUER; ABSORPTION;
OPTICS; TE125
AB We report on the observation of nuclear forward and nuclear inelastic scattering of synchrotron radiation by Te-125 and the application of both spectroscopic methods to tellurium compounds by using a high-resolution backscattering sapphire monochromator in combination with fast detection electronics. The lifetime of the nuclear resonance and the energy of the transition were determined to be 2.131(12) ns and 35493.12(30) eV, respectively. As applications, the nuclear inelastic spectrum in Sb2Te3 and the nuclear forward scattering by Te metal were measured. These measurements open the field of nuclear resonance spectroscopy on tellurium compounds such as thermoelectric and superconducting materials. Copyright (C) EPLA, 2010
C1 [Wille, H. -C.] DESY, D-22607 Hamburg, Germany.
[Hermann, R. P.; Moechel, A.; Claudio, T.; Persson, J.] Forschungszentrum Julich, Inst Festkorperforsch, JCNS, D-52425 Julich, Germany.
[Hermann, R. P.; Moechel, A.; Claudio, T.; Persson, J.] Forschungszentrum Julich, JARA FIT, D-52425 Julich, Germany.
[Hermann, R. P.; Moechel, A.; Claudio, T.] Univ Liege, Fac Sci, B-4000 Liege, Belgium.
[Sergueev, I.; Pelzer, U.; Rueffer, R.] European Synchrotron Radiat Facil, F-38043 Grenoble, France.
[Said, A.; Shvyd'ko, Yu. V.] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA.
RP Wille, HC (reprint author), DESY, D-22607 Hamburg, Germany.
EM hans.christian.wille@desy.de
RI Wille, Hans-Christian/C-3881-2013; Hermann, Raphael/F-6257-2013
OI Hermann, Raphael/0000-0002-6138-5624
FU Helmholtz Gemeinschaft Deutscher Forschungzentren for the
Helmholtz-University Young Investigator Group
FX The authors acknowledge the European Synchrotron Radiation Facility for
provision of the synchrotron radiation facilities at beamline ID22N, TH.
DESCHEAUX-BEAUME DANG for the developement of the forward detector
electronics and A. I. CHUMAKOV for helpful discussions. RH acknowledges
support from the Helmholtz Gemeinschaft Deutscher Forschungzentren for
the Helmholtz-University Young Investigator Group "Lattice Dynamic in
Emerging Functional Materials".
NR 43
TC 13
Z9 13
U1 2
U2 12
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 SEP
PY 2010
VL 91
IS 6
AR 62001
DI 10.1209/0295-5075/91/62001
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 674BO
UT WOS:000283708700007
ER
PT J
AU Bell, JB
Garcia, AL
Williams, SA
AF Bell, John B.
Garcia, Alejandro L.
Williams, Sarah A.
TI COMPUTATIONAL FLUCTUATING FLUID DYNAMICS
SO ESAIM-MATHEMATICAL MODELLING AND NUMERICAL ANALYSIS-MODELISATION
MATHEMATIQUE ET ANALYSE NUMERIQUE
LA English
DT Article
DE Fluctuating hydrodynamics; Landau-Lifshitz-Navier-Stokes equations;
stochastic partial differential equations; finite difference methods;
binary gas mixtures
ID RAYLEIGH-TAYLOR INSTABILITY; HYDRODYNAMIC FLUCTUATIONS; KOLMOGOROV FLOW;
THERMOCHEMICAL SYSTEM; PHASE-SEPARATION; DILUTE GAS; SIMULATION;
THERMODYNAMICS; EQUILIBRIUM; DIFFUSION
AB This paper describes the extension of a recently developed numerical solver for the Landau-Lifshitz Navier-Stokes (LLNS) equations to binary mixtures in three dimensions. The LLNS equations incorporate thermal fluctuations into macroscopic hydrodynamics by using white-noise fluxes. These stochastic PDEs are more complicated in three dimensions due to the tensorial form of the correlations for the stochastic fluxes and in mixtures due to couplings of energy and concentration fluxes (e.g., Soret effect). We present various numerical tests of systems in and out of equilibrium, including time-dependent systems, and demonstrate good agreement with theoretical results and molecular simulation.
C1 [Bell, John B.] Lawrence Berkeley Natl Lab, Ctr Computat Sci & Engn, Berkeley, CA 94720 USA.
[Garcia, Alejandro L.] San Jose State Univ, Dept Phys, San Jose, CA 95192 USA.
[Williams, Sarah A.] Univ N Carolina, Dept Math, Carolina Ctr Interdisciplinary Appl Math, Chapel Hill, NC 27599 USA.
RP Bell, JB (reprint author), Lawrence Berkeley Natl Lab, Ctr Computat Sci & Engn, Berkeley, CA 94720 USA.
EM algarcia@algarcia.org
FU DOE Office of Mathematics, Information, and Computational Sciences under
the U.S. Department of Energy [DE-AC02-05CH11231]
FX The authors wish to thank B. Alder, M. Browne, A. Donev, A. de la
Fuente, and P. Relich for helpful discussions. The work of J. Bell and
A. Garcia was supported by the Applied Mathematics Program of the DOE
Office of Mathematics, Information, and Computational Sciences under the
U.S. Department of Energy under contract No. DE-AC02-05CH11231.
NR 59
TC 20
Z9 20
U1 2
U2 16
PU CAMBRIDGE UNIV PRESS
PI NEW YORK
PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA
SN 0764-583X
J9 ESAIM-MATH MODEL NUM
JI ESAIM-Math. Model. Numer. Anal.-Model. Math. Anal. Numer.
PD SEP-OCT
PY 2010
VL 44
IS 5
BP 1085
EP 1105
DI 10.1051/m2an/2010053
PG 21
WC Mathematics, Applied
SC Mathematics
GA 644GP
UT WOS:000281362200012
ER
PT J
AU Romanelli, P
Bravin, A
Barbarisi, M
Carnevale, D
Brauer-Krisch, E
Prezado, Y
Le Duc, G
Requardt, H
Serduc, R
Mascio, G
Anschel, DJ
Lembo, G
AF Romanelli, P.
Bravin, A.
Barbarisi, M.
Carnevale, D.
Brauer-Krisch, E.
Prezado, Y.
Le Duc, G.
Requardt, H.
Serduc, R.
Mascio, G.
Anschel, D. J.
Lembo, G.
TI Modulation of epileptogenic activity using microradiosurgical cortical
transsection in an animal model of focal epilepsy
SO EUROPEAN JOURNAL OF NEUROLOGY
LA English
DT Meeting Abstract
CT 14th Congress of European-Federation-of-Neurological-Societies
CY SEP, 2010
CL Geneva, SWITZERLAND
SP European Federat Neurol Soc
C1 [Romanelli, P.; Barbarisi, M.; Mascio, G.] Neurosci Dept Neuromed, Pozzilli, Italy.
[Bravin, A.; Brauer-Krisch, E.; Prezado, Y.; Le Duc, G.; Requardt, H.; Serduc, R.] European Synchrotron Radiat Facil, F-38043 Grenoble, France.
[Carnevale, D.] Univ Roma La Sapienza, Pozzilli, Italy.
[Anschel, D. J.] Brookhaven Natl Lab, Dept Med, Upton, NY 11973 USA.
RI prezado, yolanda/B-8455-2009; prezado, yolanda/O-7376-2014; Bravin,
Alberto/R-8633-2016
OI prezado, yolanda/0000-0001-5957-2327; Bravin,
Alberto/0000-0001-6868-2755
NR 0
TC 0
Z9 0
U1 0
U2 1
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1351-5101
J9 EUR J NEUROL
JI Eur. J. Neurol.
PD SEP
PY 2010
VL 17
SU 3
SI SI
BP 62
EP 62
PG 1
WC Clinical Neurology; Neurosciences
SC Neurosciences & Neurology
GA 800BD
UT WOS:000293331100125
ER
PT J
AU Jackson, JD
AF Jackson, J. D.
TI Comment on 'Maxwell equations and the redundant gauge degree of freedom'
SO EUROPEAN JOURNAL OF PHYSICS
LA English
DT Editorial Material
AB In the paper Wong (2009 Eur. J. Phys. 30 1401), the author makes the claim that in classical electromagnetic theory the longitudinal electric field is instantaneous, corresponding to action at a distance, contrary to popular and correct belief. We point out that the determination of the speed of propagation of electromagnetic fields requires specification of the initial condition of the sources or equivalent. The Coulomb field of a stationary point charge proves nothing. We discuss the limitations of the Helmholtz decomposition in determining the physically significant longitudinal (and transverse) part(s) of the electric field. That decomposition does yield a longitudinal electric field that is the negative gradient of the instantaneous scalar potential of the Coulomb gauge (del . A(C) = 0). However, a necessary contribution from the negative time derivative of the Coulomb-gauge vector potential exactly cancels the Helmholtz contribution. The result is a fully causal and gauge-invariant electric field. We describe in detail a simple example to illustrate the above features and the universal onset of the static 'instantaneous' regime throughout a region of space that expands with the speed of light, with the induction and radiation fields only on its boundary surface.
C1 [Jackson, J. D.] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
[Jackson, J. D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Jackson, JD (reprint author), Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA.
EM jdjackson@lbl.gov
NR 5
TC 5
Z9 5
U1 0
U2 3
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0143-0807
J9 EUR J PHYS
JI Eur. J. Phys.
PD SEP
PY 2010
VL 31
IS 5
BP L79
EP L84
DI 10.1088/0143-0807/31/5/L02
PG 6
WC Education, Scientific Disciplines; Physics, Multidisciplinary
SC Education & Educational Research; Physics
GA 644WY
UT WOS:000281414000030
ER
PT J
AU Sibirtsev, A
Haidenbauer, J
Hammer, HW
Krewald, S
Meissner, UG
AF Sibirtsev, A.
Haidenbauer, J.
Hammer, H. -W.
Krewald, S.
Meissner, U. -G.
TI Proton-proton scattering above 3 GeV/c
SO EUROPEAN PHYSICAL JOURNAL A
LA English
DT Article
ID NUCLEON-NUCLEON-SCATTERING; P ELASTIC-SCATTERING; RELATIVISTIC
OPTICAL-MODEL; MESON-EXCHANGE MODEL; LARGE ANGULAR REGION; TOTAL
CROSS-SECTIONS; GEV-C; ANALYZING POWER; POLARIZATION PARAMETER;
HIGH-ENERGIES
AB A large set of data on proton-proton differential cross sections, analyzing powers and the double-polarization parameter A(NN) is analyzed employing the Regge formalism. We find that the data available at proton beam momenta from 3 GeV/c to 50 GeV/c exhibit features that are very well in line with the general characteristics of Regge phenomenology and can be described with a model that includes the p, omega, f(2), and a(2) trajectories and single-Pomeron exchange. Additional data, specifically for spin-dependent observables at forward angles, would be very helpful for testing and refining our Regge model.
C1 [Sibirtsev, A.; Hammer, H. -W.; Meissner, U. -G.] Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theorie, D-53115 Bonn, Germany.
[Sibirtsev, A.; Hammer, H. -W.; Meissner, U. -G.] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany.
[Sibirtsev, A.] Thomas Jefferson Natl Accelerator Facil, EBAC, Newport News, VA 23606 USA.
[Sibirtsev, A.; Haidenbauer, J.; Krewald, S.; Meissner, U. -G.] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany.
[Sibirtsev, A.; 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 Sibirtsev, A (reprint author), Univ Bonn, Helmholtz Inst Strahlen & Kernphys Theorie, D-53115 Bonn, Germany.
EM j.haidenbauer@fz-juelich.de
OI Krewald, Siegfried/0000-0002-8596-8429
FU Helmholtz Association [VH-VI-231]; EU; DFG [SFB/TR 16]; U.S. DOE
[DE-AC05-06OR23177]; JLab [SURA-06-C0452]; COSY FFE [41760632
(COSY-085)]
FX We are indebted to N.N. Nikolaev for instructive discussions. This work
is partially supported by the Helmholtz Association through funds
provided to the virtual institute "Spin and strong QCD" (VH-VI-231), by
the EU Integrated Infrastructure Initiative HadronPhysics2 Project (WP4
QCDnet) and by DFG (SFB/TR 16, "Subnuclear Structure of Matter"). This
work was also supported in part by U.S. DOE Contract No.
DE-AC05-06OR23177, under which Jefferson Science Associates, LLC,
operates Jefferson Lab. A.S. acknowledges support by the JLab grant
SURA-06-C0452 and the COSY FFE grant No. 41760632 (COSY-085).
NR 94
TC 3
Z9 3
U1 0
U2 3
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 SEP
PY 2010
VL 45
IS 3
BP 357
EP 372
DI 10.1140/epja/i2010-11014-1
PG 16
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 652AS
UT WOS:000281972900009
ER
PT J
AU Boyce, BL
AF Boyce, B. L.
TI A Sequential Tensile Method for Rapid Characterization of Extreme-value
Behavior in Microfabricated Materials
SO EXPERIMENTAL MECHANICS
LA English
DT Article
DE Silicon; MEMS; Fracture; Strength; Weibull
ID SELF-ASSEMBLED MONOLAYERS; MECHANICAL CHARACTERIZATION; POLYCRYSTALLINE
SILICON; FRACTURE-TOUGHNESS; POLYSILICON FILMS; STRENGTH; MEMS
AB A high-throughput sequential tensile test method has been developed to characterize the fracture strength distribution of microfabricated polycrystalline silicon, the primary structural material used in microelectromechanical systems (MEMS). The resulting dataset of over 1,000 microtensile tests reveals subtle extreme-value behavior in the tails of the distribution, demonstrating that the common two-parameter Weibull distribution is inferior to a three-parameter Weibull model. The results suggest the existence of a cut-off or threshold stress (1.446 GPa for this particular material) below which tensile failure will not occur. The existence of a cut-off stress suggests that the material's flaw size distribution and toughness distribution are both also bounded. From an application perspective, the cut-off stress provides a statistically-sound basis for reliable design. While the sequential method is demonstrated here for tensile strength distributions in polycrystalline silicon MEMS, the technique could be extended to a wide range of mechanical tests (bending strength, elastic modulus, fracture toughness, creep, etc.) for both microsystem and conventional materials.
C1 Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Boyce, BL (reprint author), Sandia Natl Labs, POB 5800,MS0889, Albuquerque, NM 87185 USA.
EM blboyce@sandia.gov
RI Boyce, Brad/H-5045-2012
OI Boyce, Brad/0000-0001-5994-1743
FU United States Department of Energy's National Nuclear Security
Administration [DE-AC04-94AL85000]
FX The author would like to thank T. Crenshaw for laboratory support, Dr.
J.R. Michael, B. McKenzie, R. Grant for SEM imaging, and Drs. J.W.
Foulk, M. P de Boer, and E. D. Reedy, Jr. for useful discussions on this
topic. 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 16
TC 15
Z9 15
U1 1
U2 3
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0014-4851
J9 EXP MECH
JI Exp. Mech.
PD SEP
PY 2010
VL 50
IS 7
BP 993
EP 997
DI 10.1007/s11340-009-9286-x
PG 5
WC Materials Science, Multidisciplinary; Mechanics; Materials Science,
Characterization & Testing
SC Materials Science; Mechanics
GA 641WT
UT WOS:000281162800013
ER
PT J
AU Liu, C
AF Liu, C.
TI Elastic Constants Determination and Deformation Observation Using
Brazilian Disk Geometry
SO EXPERIMENTAL MECHANICS
LA English
DT Article
DE Brazilian disk; Elastic constants; Failure; Digital image correlation;
Optical technique
ID DIGITAL-IMAGE-CORRELATION; DIAMETRAL COMPRESSION; TENSILE-STRENGTH
AB Brazilian disk compression has been proposed as an alternative for measuring elastic constants of brittle solids with very low tensile strength (Hondros, Aust J Appl Sci 10:243-268, 1959). Subsequently however, the Brazilian disk geometry was mainly used for measuring fracture toughness and tensile strength of brittle materials, like rocks and concretes. In this study, we revisit the Brazilian disk specimen as a tool for determining elastic constants and for observing the deformation process up to failure. We used the optical digital image correlation (DIC) technique to obtain the displacement field on the specimen surface and proposed a scheme for determining the elastic constants from the measured displacement field and the applied load. Details of the elastic constant determination of a homogeneous material, epoxy resin, were presented. Comparison of the elastic constant measured using Brazilian disk with those obtained through more conventional means was carried out. We also present observations of the deformation evolution of the epoxy resin disk subjected to large nonlinear deformation up to failure and subjected to compressive loading and unloading.
C1 Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA.
RP Liu, C (reprint author), Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA.
EM cliu@lanl.gov
FU Joint DoD/DOE; Enhanced Surveillance Campaign
FX This study was supported by the Joint DoD/DOE Munitions Program and by
the Enhanced Surveillance Campaign. The author also wants to thank Drs.
Matthew W. Lewis and Philip Rae of Los Alamos National Laboratory for
the valuable comments.
NR 12
TC 11
Z9 11
U1 1
U2 14
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0014-4851
J9 EXP MECH
JI Exp. Mech.
PD SEP
PY 2010
VL 50
IS 7
BP 1025
EP 1039
DI 10.1007/s11340-009-9281-2
PG 15
WC Materials Science, Multidisciplinary; Mechanics; Materials Science,
Characterization & Testing
SC Materials Science; Mechanics
GA 641WT
UT WOS:000281162800017
ER
PT J
AU Beresh, SJ
Henfling, JF
Spillers, RW
AF Beresh, Steven J.
Henfling, John F.
Spillers, Russell W.
TI Meander of a fin trailing vortex and the origin of its turbulence
SO EXPERIMENTS IN FLUIDS
LA English
DT Article
ID PARTICLE IMAGE VELOCIMETRY; WING-TIP VORTEX; LEADING-EDGE VORTICES;
NEAR-FIELD; BOUNDARY-LAYER; UNSTEADY-FLOW; GENERATORS; SIMULATION; WATER
AB The low-frequency meander of a trailing vortex shed from a tapered fin installed on a wind tunnel wall has been studied using stereoscopic particle image velocimetry in the near-wake at Mach 0.8. Distributions of the instantaneous vortex position reveal that the meander amplitude increases with downstream distance and decreases with vortex strength, indicating meander is induced external to the vortex. Trends with downstream distance suggest meander begins on the fin surface, prior to vortex shedding. Mean vortex properties are unaltered when considered in the meandering reference frame, apparently because turbulent fluctuations in the vortex shape and strength dominate positional variations. Conversely, a large peak of artificial turbulent kinetic energy is found centered in the vortex core, which almost entirely disappears when corrected for meander, though some turbulence remains near the core radius. Turbulence originating at the wind tunnel wall was shown to contribute to vortex meander by energizing the incoming boundary layer using low-profile vortex generators and observing a substantial increase in the meander amplitude, while greater turbulent kinetic energy penetrates the vortex core. An explanatory mechanism has been hypothesized, in which the vortex initially forms at the apex of the swept leading edge of the fin where it is exposed to turbulent fluctuations within the wind tunnel wall boundary layer, introducing an instability into the incipient vortex core.
C1 [Beresh, Steven J.; Henfling, John F.; Spillers, Russell W.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Beresh, SJ (reprint author), Sandia Natl Labs, POB 5800,Mailstop 0825, Albuquerque, NM 87185 USA.
EM sjberes@sandia.gov
FU Sandia National Laboratories; United States Department of Energy; United
States Department of Energy's National Nuclear Security Administration
[DE-AC04-94AL85000]
FX The authors would like to thank Justin A. Smith and Walter P. Wolfe of
Sandia National Laboratories for numerous fruitful discussions regarding
fin aerodynamics and trailing vortices, and Thomas W. Grasser of Sandia
for his contributions to the hardware design and fabrication. This work
was supported by Sandia National Laboratories and the United States
Department of Energy. 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 37
TC 13
Z9 13
U1 0
U2 6
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0723-4864
J9 EXP FLUIDS
JI Exp. Fluids
PD SEP
PY 2010
VL 49
IS 3
BP 599
EP 611
DI 10.1007/s00348-010-0825-0
PG 13
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA 636BK
UT WOS:000280702600004
ER
PT J
AU Prach, L
Kirby, J
Keasling, JD
Alber, T
AF Prach, Lisa
Kirby, James
Keasling, Jay D.
Alber, Tom
TI Diterpene production in Mycobacterium tuberculosis
SO FEBS JOURNAL
LA English
DT Article
DE cyclase; edaxadiene; Rv3377c; Rv3378c; tuberculosinol
ID ISOPRENOID BIOSYNTHESIS; CYCLASE; TERPENTECIN; CHEMISTRY; GENES
AB Diterpenes are a structurally diverse class of molecules common in plants, although they are very rarely found in bacteria. We report the identification in Mycobacterium tuberculosis (Mtb) of three diterpenes proposed to promote phagolysosome maturation arrest. MS analysis reveals that these diterpenes are novel compounds not previously identified in other organisms. The diterpene with highest abundance in Mtb has a mass fragmentation pattern identical to edaxadiene, which is produced in vitro from geranylgeranyl diphosphate by the enzymes Rv3377c and Rv3378c. A second diterpene found in Mtb has a similar mass spectrum, and is always observed in the same proportion relative to edaxadiene, indicating that it is a side product of the Rv3378c reaction in vivo. We name this second diterpene olefin edaxadiene B. The least abundant of the three diterpenes in Mtb extracts is tuberculosinol, a dephosphorylated side-product of the edaxadiene pathway intermediate produced by Rv3377c. A frameshift in Rv3377c in Mtb completely eliminates diterpene production, whereas expression of Rv3377c and Rv3378c in the nonpathogenic M. smegmatis is sufficient to produce edaxadiene and edaxadiene B. These studies define the pathway of edaxadiene and edaxadiene B biosynthesis in vivo. Rv3377c and Rv3378c are unique to Mtb and M. bovis, making them candidates for selective therapeutics and diagnostics.
C1 [Prach, Lisa; Alber, Tom] Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA.
[Kirby, James; Keasling, Jay D.] Univ Calif Berkeley, Calif Inst Quantitat Biosci QB3, Berkeley, CA 94720 USA.
[Keasling, Jay D.] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA.
[Keasling, Jay D.] Univ Calif Berkeley, Dept Bioengn, Berkeley, CA 94720 USA.
[Keasling, Jay D.] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA.
RP Alber, T (reprint author), Univ Calif Berkeley, Dept Mol & Cell Biol, 229 Stanley Hall, Berkeley, CA 94720 USA.
EM tom@ucxray.berkeley.edu
RI Keasling, Jay/J-9162-2012
OI Keasling, Jay/0000-0003-4170-6088
FU NIH [P01AI68135]
FX We thank C. Sassetti (Univerisity of Massachusetts) for the gift of
pTETGW; M. Schelle (University of California, Berkeley) for Mtb strains;
and the TB Vaccine Testing and Research Materials Facility at Colorado
State University for providing the gamma-irradiated H37Rv cells and Mtb
genomic DNA. This work was supported by NIH grant P01AI68135 to T.A.
NR 18
TC 10
Z9 10
U1 0
U2 8
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1742-464X
J9 FEBS J
JI FEBS J.
PD SEP
PY 2010
VL 277
IS 17
BP 3588
EP 3595
DI 10.1111/j.1742-4658.2010.07767.x
PG 8
WC Biochemistry & Molecular Biology
SC Biochemistry & Molecular Biology
GA 639TB
UT WOS:000280996300013
PM 20670276
ER
PT J
AU Elifantz, H
N'Guessan, LA
Mouser, PJ
Williams, KH
Wilkins, MJ
Risso, C
Holmes, DE
Long, PE
Lovley, DR
AF Elifantz, Hila
N'Guessan, Lucie A.
Mouser, Paula J.
Williams, Kenneth H.
Wilkins, Michael J.
Risso, Carla
Holmes, Dawn E.
Long, Philip E.
Lovley, Derek R.
TI Expression of acetate permease-like (apl ) genes in subsurface
communities of Geobacter species under fluctuating acetate
concentrations
SO FEMS MICROBIOLOGY ECOLOGY
LA English
DT Article
DE geobacter; apl genes; acetate; expression
ID URANIUM-CONTAMINATED AQUIFER; DISSIMILATORY METAL REDUCTION; QUANTIFYING
EXPRESSION; HARVESTING ELECTRODES; SP-NOV.; BIOREMEDIATION; GROUNDWATER;
LIMITATION; DIVERSITY; SEDIMENTS
AB The addition of acetate to uranium-contaminated aquifers in order to stimulate the growth and activity of Geobacter species that reduce uranium is a promising in situ bioremediation option. Optimizing this bioremediation strategy requires that sufficient acetate be added to promote Geobacter species growth. We hypothesized that under acetate-limiting conditions, subsurface Geobacter species would increase the expression of either putative acetate symporters genes (aplI and aplII). Acetate was added to a uranium-contaminated aquifer (Rifle, CO) in two continuous amendments separated by 5 days of groundwater flush to create changing acetate concentrations. While the expression of aplI in monitoring well D04 (high acetate) weakly correlated with the acetate concentration over time, the transcript levels for this gene were relatively constant in well D08 (low acetate). At the lowest acetate concentrations during the groundwater flush, the transcript levels of aplII were the highest. The expression of aplII decreased 2-10-fold upon acetate reintroduction. However, the overall instability of acetate concentrations throughout the experiment could not support a robust conclusion regarding the role of apl genes in response to acetate limitation under field conditions, in contrast to previous chemostat studies, suggesting that the function of a microbial community cannot be inferred based on lab experiments alone.
C1 [Elifantz, Hila; N'Guessan, Lucie A.; Mouser, Paula J.; Risso, Carla; Holmes, Dawn E.; Lovley, Derek R.] Univ Massachusetts, Dept Microbiol, Amherst, MA 01003 USA.
[Williams, Kenneth H.] Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA USA.
[Wilkins, Michael J.] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA.
[Holmes, Dawn E.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Elifantz, H (reprint author), Hebrew Univ Jerusalem, Alexander Silberman Inst Life Sci, Dept Microbial Ecol & Plant Sci, IL-91904 Jerusalem, Israel.
EM helifantz@gmail.com
RI Wilkins, Michael/A-9358-2013; Long, Philip/F-5728-2013; Williams,
Kenneth/O-5181-2014
OI Long, Philip/0000-0003-4152-5682; Williams, Kenneth/0000-0002-3568-1155
FU Office of Science (BER), U.S. Department of Energy [DE-FC02-02ER63446,
DE-FG02-07ER64377]
FX We thank Joy Ward and Betsy Blunt for the technical support. We thank
our collaborators at the Integrated Field Challenge program in Old
Rifle, CO. This research was supported by the Office of Science (BER),
U.S. Department of Energy, cooperative agreement no. DE-FC02-02ER63446
and grant no. DE-FG02-07ER64377.
NR 38
TC 11
Z9 11
U1 0
U2 8
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0168-6496
J9 FEMS MICROBIOL ECOL
JI FEMS Microbiol. Ecol.
PD SEP
PY 2010
VL 73
IS 3
BP 441
EP 449
DI 10.1111/j.1574-6941.2010.00907.x
PG 9
WC Microbiology
SC Microbiology
GA 635CK
UT WOS:000280633000003
PM 20533942
ER
PT J
AU Cohen, A
Miller, M
AF Cohen, Avner
Miller, Marvin
TI Bringing Israel's Bomb Out of the Basement Has Nuclear Ambiguity
Outlived Its Shelf Life?
SO FOREIGN AFFAIRS
LA English
DT Article
AB For decades, Israel has maintained an "opaque" nuclear posture neither confirming nor denying that it possesses nuclear weapons. As pressure for Israel to join the Nuclear Nonproliferation Treaty grows and Israel's tensions with Iran mount, the time has come to reconsider this policy of nuclear ambiguity. Israel can loosen its policy of opacity without jeopardizing its security, and doing so would burnish its credentials as a responsible nuclear power.
C1 [Cohen, Avner] Monterey Inst Int Studies, James Martin Ctr Nonproliferat Studies, Monterey, CA USA.
[Miller, Marvin] MIT, Sci Technol & Soc Program, Cambridge, MA 02139 USA.
[Miller, Marvin] MIT, Dept Nucl Engn, Cambridge, MA 02139 USA.
[Miller, Marvin] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Miller, Marvin] Oak Ridge Natl Lab, Oak Ridge, TN USA.
RP Cohen, A (reprint author), Monterey Inst Int Studies, James Martin Ctr Nonproliferat Studies, Monterey, CA USA.
NR 0
TC 4
Z9 4
U1 1
U2 7
PU COUNC FOREIGN RELAT INC
PI NEW YORK
PA 58 E 68TH ST, NEW YORK, NY 10021 USA
SN 0015-7120
J9 FOREIGN AFF
JI Foreign Aff.
PD SEP-OCT
PY 2010
VL 89
IS 5
BP 30
EP +
PG 16
WC International Relations
SC International Relations
GA 643YF
UT WOS:000281336200004
ER
PT J
AU Bernot, MJ
Sobota, DJ
Hall, RO
Mulholland, PJ
Dodds, WK
Webster, JR
Tank, JL
Ashkenas, LR
Cooper, LW
Dahm, CN
Gregory, SV
Grimm, NB
Hamilton, SK
Johnson, SL
Mcdowell, WH
Meyer, JL
Peterson, B
Poole, GC
Valett, HM
Arango, C
Beaulieu, JJ
Burgin, AJ
Crenshaw, C
Helton, AM
Johnson, L
Merriam, J
Niederlehner, BR
O'Brien, JM
Potter, JD
Sheibley, RW
Thomas, SM
Wilson, K
AF Bernot, Melody J.
Sobota, Daniel J.
Hall, Robert O., Jr.
Mulholland, Patrick J.
Dodds, Walter K.
Webster, Jackson R.
Tank, Jennifer L.
Ashkenas, Linda R.
Cooper, Lee W.
Dahm, Clifford N.
Gregory, Stanley V.
Grimm, Nancy B.
Hamilton, Stephen K.
Johnson, Sherri L.
Mcdowell, William H.
Meyer, Judith L.
Peterson, Bruce
Poole, Geoffrey C.
Valett, H. Maurice
Arango, Clay
Beaulieu, Jake J.
Burgin, Amy J.
Crenshaw, Chelsea
Helton, Ashley M.
Johnson, Laura
Merriam, Jeff
Niederlehner, B. R.
O'Brien, Jonathan M.
Potter, Jody D.
Sheibley, Richard W.
Thomas, Suzanne M.
Wilson, Kym
TI Inter-regional comparison of land-use effects on stream metabolism
SO FRESHWATER BIOLOGY
LA English
DT Article
DE ecosystem respiration; land use; metabolism; primary production; stream
ID MEDITERRANEAN STREAM; ECOSYSTEM METABOLISM; BIOFILM METABOLISM; NITRATE
REMOVAL; TROPHIC STATE; RESPIRATION; PATTERNS; RIVER; FLOW;
DENITRIFICATION
AB P>1. Rates of whole-system metabolism (production and respiration) are fundamental indicators of ecosystem structure and function. Although first-order, proximal controls are well understood, assessments of the interactions between proximal controls and distal controls, such as land use and geographic region, are lacking. Thus, the influence of land use on stream metabolism across geographic regions is unknown. Further, there is limited understanding of how land use may alter variability in ecosystem metabolism across regions.
2. Stream metabolism was measured in nine streams in each of eight regions (n = 72) across the United States and Puerto Rico. In each region, three streams were selected from a range of three land uses: agriculturally influenced, urban-influenced, and reference streams. Stream metabolism was estimated from diel changes in dissolved oxygen concentrations in each stream reach with correction for reaeration and groundwater input.
3. Gross primary production (GPP) was highest in regions with little riparian vegetation (sagebrush steppe in Wyoming, desert shrub in Arizona/New Mexico) and lowest in forested regions (North Carolina, Oregon). In contrast, ecosystem respiration (ER) varied both within and among regions. Reference streams had significantly lower rates of GPP than urban or agriculturally influenced streams.
4. GPP was positively correlated with photosynthetically active radiation and autotrophic biomass. Multiple regression models compared using Akaike's information criterion (AIC) indicated GPP increased with water column ammonium and the fraction of the catchment in urban and reference land-use categories. Multiple regression models also identified velocity, temperature, nitrate, ammonium, dissolved organic carbon, GPP, coarse benthic organic matter, fine benthic organic matter and the fraction of all land-use categories in the catchment as regulators of ER.
5. Structural equation modelling indicated significant distal as well as proximal control pathways including a direct effect of land-use on GPP as well as SRP, DIN, and PAR effects on GPP; GPP effects on autotrophic biomass, organic matter, and ER; and organic matter effects on ER.
6. Overall, consideration of the data separated by land-use categories showed reduced inter-regional variability in rates of metabolism, indicating that the influence of agricultural and urban land use can obscure regional differences in stream metabolism.
C1 [Bernot, Melody J.] Ball State Univ, Dept Biol, Muncie, IN 47306 USA.
[Sobota, Daniel J.; Ashkenas, Linda R.; Gregory, Stanley V.] Oregon State Univ, Dept Fisheries & Wildlife, Corvallis, OR 97331 USA.
[Sobota, Daniel J.] Washington State Univ, Sch Earth & Environm Sci, Vancouver, WA 98686 USA.
[Hall, Robert O., Jr.] Univ Wyoming, Dept Zool & Physiol, Laramie, WY 82071 USA.
[Mulholland, Patrick J.] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37831 USA.
[Dodds, Walter K.; Wilson, Kym] Kansas State Univ, Div Biol, Manhattan, KS 66506 USA.
[Webster, Jackson R.; Valett, H. Maurice; Niederlehner, B. R.] Virginia Tech, Dept Biol Sci, Blacksburg, VA 24061 USA.
[Tank, Jennifer L.; Arango, Clay; Beaulieu, Jake J.; Johnson, Laura] Univ Notre Dame, Dept Biol Sci, Notre Dame, IN 46556 USA.
[Cooper, Lee W.] Univ Maryland, Chesapeake Biol Lab, Ctr Environm Sci, Solomons, MD 20688 USA.
[Dahm, Clifford N.; Crenshaw, Chelsea; Sheibley, Richard W.] Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA.
[Grimm, Nancy B.; Sheibley, Richard W.] Arizona State Univ, Sch Life Sci, Tempe, AZ 85287 USA.
[Hamilton, Stephen K.; Burgin, Amy J.; O'Brien, Jonathan M.] Michigan State Univ, Kellogg Biol Stn, Hickory Corners, MI 49060 USA.
[Johnson, Sherri L.] US Forest Serv, Pacific NW Res Stn, Corvallis, OR 97331 USA.
[Mcdowell, William H.; Merriam, Jeff; Potter, Jody D.] Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA.
[Meyer, Judith L.; Helton, Ashley M.] Univ Georgia, Inst Ecol, Athens, GA 30602 USA.
[Peterson, Bruce; Thomas, Suzanne M.] Marine Biol Lab, Ctr Ecosyst, Woods Hole, MA 02543 USA.
[Poole, Geoffrey C.] Montana State Univ, Dept Land Resources & Environm Sci, Bozeman, MT 59717 USA.
[Sheibley, Richard W.] USGS Washington Water Sci Ctr, Tacoma, WA 98402 USA.
RP Bernot, MJ (reprint author), Ball State Univ, Dept Biol, Muncie, IN 47306 USA.
EM mjbernot@bsu.edu
RI Mulholland, Patrick/C-3142-2012; Cooper, Lee/E-5251-2012; O'Brien,
Jonathan/G-6786-2012; Grimm, Nancy/D-2840-2009; Burgin, Amy/G-7444-2014;
McDowell, William/E-9767-2010; Hamilton, Stephen/N-2979-2014; Burgin,
Amy/C-1528-2010;
OI Cooper, Lee/0000-0001-7734-8388; Grimm, Nancy/0000-0001-9374-660X;
Burgin, Amy/0000-0001-8489-4002; McDowell, William/0000-0002-8739-9047;
Hamilton, Stephen/0000-0002-4702-9017; Burgin, Amy/0000-0001-8489-4002;
Sheibley, Richard/0000-0003-1627-8536; Poole,
Geoffrey/0000-0002-8458-0203
FU U.S. National Science Foundation [DEB-0111410]; University of Tennessee;
NSF LTER
FX This work was supported by a U.S. National Science Foundation grant
(DEB-0111410) to PJM, University of Tennessee and additional NSF LTER
support at many of the sites. We thank all LINX II site crews for
research assistance, private and public landowners and community
participants for access to sites and site information, D Gudder and two
anonymous reviewers for comments on the manuscript, and BJ Roberts and
RJ Bernot for helpful discussions.
NR 64
TC 117
Z9 119
U1 10
U2 184
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0046-5070
EI 1365-2427
J9 FRESHWATER BIOL
JI Freshw. Biol.
PD SEP
PY 2010
VL 55
IS 9
BP 1874
EP 1890
DI 10.1111/j.1365-2427.2010.02422.x
PG 17
WC Marine & Freshwater Biology
SC Marine & Freshwater Biology
GA 639TL
UT WOS:000280997300006
ER
PT J
AU Kerisit, S
Liu, CX
AF Kerisit, Sebastien
Liu, Chongxuan
TI Molecular simulation of the diffusion of uranyl carbonate species in
aqueous solution
SO GEOCHIMICA ET COSMOCHIMICA ACTA
LA English
DT Article
ID X-RAY-DIFFRACTION; INTERATOMIC POTENTIAL MODEL; LIGAND-EXCHANGE
REACTIONS; HYDRATED MAGNESIUM-ION; DYNAMICS SIMULATIONS; WATER-EXCHANGE;
AB-INITIO; LIQUID WATER; VADOSE ZONE; ABSORPTION SPECTROSCOPY
AB Potential-based molecular dynamics simulations of aqueous uranyl carbonate species (M(x)UO(2)(CO(3))(y)(2+2x-2y) with M = Mg, Ca, or Sr) were carried out to gain molecular-level insight into the hydration properties of these species. The simulation results were used to estimate the self-diffusion coefficients of these uranyl carbonate species, which often dominate uranyl speciation in groundwater systems. The diffusion coefficients obtained for the monoatomic alkaline-earth cations and polyatomic ions (uranyl, carbonate, and uranyl tri-carbonate) were compared with those calculated from the Stokes-Einstein (SE) equation and its variant formulation by Impey et al. (1983). Our results show that the equation of Impey et al. (1983), originally formulated for monovalent monoatomic ions, can be extended to divalent monoatomic ions, with some success in reproducing the absolute values and the overall trend determined from the molecular dynamics simulations, but not to polyatomic ions, for which the hydration shell is not spherically symmetrical. Despite the quantitative failure of both SE formulations, a plot of the diffusion coefficients of the uranyl carbonate complexes as a function of the inverse of the equivalent spherical radius showed that a general linear dependence is observed for these complexes as expected from the SE equation. The nature of the alkaline-earth cation in the uranyl carbonate complexes was not found to have a significant effect on the ion's diffusion coefficient, which suggests that the use of a single diffusion coefficient for different alkaline-earth uranyl carbonate complexes in microscopic diffusion models is appropriate.
The potential model reproduced well published quantum mechanical and experimental data of Ca(x)UO(2)(CO(3))(3)(2x-4) and of the individual constituent ions, and therefore is expected to offer reliable predictions of the structure of magnesium and strontium uranyl carbonate aqueous species, for which there is no structural data available to date. In addition, the interatomic distances reported for Ca(x)UO(2)(CO(3))(3)(2x-4) could help with the refinement of the interpretation of EXAFS data of these species, which is made difficult by the similar uranium-distant carbonate oxygen and uranium-calcium distances.
An analysis of the dynamics of water exchange around the alkaline-earth cations revealed that the presence of the uranyl tri-carbonate molecule has a strong influence on the geometry of the cation's first hydration shell, which, in turn, can considerably affect the water exchange kinetics depending on whether the imposed geometry matches that around the isolated alkaline-earth cation. This result shows that the alkaline-earth uranyl carbonate complexes have distinct water exchange dynamics, which may lead to different reactivities. Finally, significant changes in water residence time were also predicted when replacing carbonate for water ligands in the uranyl coordination shell. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Kerisit, Sebastien; Liu, Chongxuan] Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
RP Kerisit, S (reprint author), Pacific NW Natl Lab, Div Chem & Mat Sci, Richland, WA 99352 USA.
EM sebastien.kerisit@pnl.gov
RI Liu, Chongxuan/C-5580-2009
FU US Department of Energy (DOE), Office of Biological and Environmental
Research (BER); US DOE's Office of Biological and Environmental Research
(OBER)
FX This research was supported by the US Department of Energy (DOE) through
the Environmental Remediation Science Program (ERSP) of the Office of
Biological and Environmental Research (BER). The computer simulations
were performed in part using the Molecular Science Computing Facility
(MSCF) in the William R. Wiley Environmental Molecular Sciences
Laboratory (EMSL), a national scientific user facility sponsored by the
US DOE's Office of Biological and Environmental Research (OBER) and
located at Pacific Northwest National Laboratory (PNNL). PNNL is
operated for the DOE by Battelle Memorial Institute under Contract
DE-ACO5-76RLOI 830.
NR 163
TC 56
Z9 57
U1 7
U2 68
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0016-7037
J9 GEOCHIM COSMOCHIM AC
JI Geochim. Cosmochim. Acta
PD SEP 1
PY 2010
VL 74
IS 17
BP 4937
EP 4952
DI 10.1016/j.gca.2010.06.007
PG 16
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 636PT
UT WOS:000280751400004
ER
PT J
AU Behr, WM
Rood, DH
Fletcher, KE
Guzman, N
Finkel, R
Hanks, TC
Hudnut, KW
Kendrick, KJ
Platt, JP
Sharp, WD
Weldon, RJ
Yule, JD
AF Behr, W. M.
Rood, D. H.
Fletcher, K. E.
Guzman, N.
Finkel, R.
Hanks, T. C.
Hudnut, K. W.
Kendrick, K. J.
Platt, J. P.
Sharp, W. D.
Weldon, R. J.
Yule, J. D.
TI Uncertainties in slip-rate estimates for the Mission Creek strand of the
southern San Andreas fault at Biskra Palms Oasis, southern California
SO GEOLOGICAL SOCIETY OF AMERICA BULLETIN
LA English
DT Article
ID GLOBAL POSITIONING SYSTEM; EASTERN CALIFORNIA; SHEAR ZONE; COACHELLA
VALLEY; EARTHQUAKE; ACCUMULATION; CONSTRAINTS; VELOCITY; MODELS; SOILS
AB This study focuses on uncertainties in estimates of the geologic slip rate along the Mission Creek strand of the southern San Andreas fault where it offsets an alluvial fan (T2) at Biskra Palms Oasis in southern California. We provide new estimates of the amount of fault offset of the T2 fan based on trench excavations and new cosmogenic Be-10 age determinations from the tops of 12 boulders on the fan surface. We present three alternative fan offset models: a minimum, a maximum, and a preferred offset of 660 m, 980 m, and 770 m, respectively. We assign an age of between 45 and 54 ka to the T2 fan from the 10Be data, which is significantly older than previously reported but is consistent with both the degree of soil development associated with this surface, and with ages from U-series geochronology on pedogenic carbonate from T2, described in a companion paper by Fletcher et al. (this volume). These new constraints suggest a range of slip rates between similar to 12 and 22 mm/yr with a preferred estimate of similar to 14-17 mm/yr for the Mission Creek strand of the southern San Andreas fault. Previous studies suggested that the geologic and geodetic slip-rate estimates at Biskra Palms differed. We find, however, that considerable uncertainty affects both the geologic and geodetic slip-rate estimates, such that if a real discrepancy between these rates exists for the southern San Andreas fault at Biskra Palms, it cannot be demonstrated with available data.
C1 [Behr, W. M.; Platt, J. P.] Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA.
[Rood, D. H.; Finkel, R.] Lawrence Livermore Natl Lab, Ctr Accelerator Mass Spectrometry, Livermore, CA 94550 USA.
[Fletcher, K. E.] Univ Calif Berkeley, Dept Earth & Planetary Sci, Berkeley, CA 94720 USA.
[Guzman, N.; Yule, J. D.] Calif State Univ Northridge, Dept Earth Sci, Northridge, CA 91330 USA.
[Hanks, T. C.] US Geol Survey, Menlo Pk, CA 94025 USA.
[Hudnut, K. W.; Kendrick, K. J.] US Geol Survey, Pasadena, CA 91106 USA.
[Sharp, W. D.] Berkeley Geochronol Ctr, Berkeley, CA 94709 USA.
[Weldon, R. J.] 1272 Univ Oregon, Dept Geol Sci, Eugene, OR 97403 USA.
RP Behr, WM (reprint author), Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA.
EM behr@usc.edu
RI Hudnut, Kenneth/G-5713-2010; Behr, Whitney/G-1127-2011; Hudnut,
Kenneth/B-1945-2009
OI Hudnut, Kenneth/0000-0002-3168-4797
FU National Science Foundation [EAR-0106924]; USGS [02HQAG0008]
FX We thank Becky Dorsey, Mike Oskin, and Kurt Frankel for several very
helpful discussions. We also thank numerous other Southern California
Earthquake Center (SCEC) community researchers who participated in
discussions and review during field trips to Biskra Palms, especially on
January 31, 2008. Jonathan Matti, Doug Morton, and Patricia McCrory
provided preliminary internal U.S. Geological Survey (USGS) reviews that
greatly improved this paper prior to submission. Kurt Frankel, Eric
Kirby, and an anonymous reviewer also provided formal reviews that led
to significant improvements to this paper. We would also like to thank
the employees at Granite Construction Company, Indio, California,
particularly Sterling Wainscott for providing us with nearly unlimited
access to the gravel quarry in which the Biskra Palms fan is located.
This research was supported by the SCEC, which is funded by National
Science Foundation cooperative agreement EAR-0106924 and USGS
cooperative agreement 02HQAG0008. The SCEC contribution number for this
paper is 1292.
NR 55
TC 50
Z9 50
U1 0
U2 11
PU GEOLOGICAL SOC AMER, INC
PI BOULDER
PA PO BOX 9140, BOULDER, CO 80301-9140 USA
SN 0016-7606
EI 1943-2674
J9 GEOL SOC AM BULL
JI Geol. Soc. Am. Bull.
PD SEP
PY 2010
VL 122
IS 9-10
BP 1360
EP 1377
DI 10.1130/B30020.1
PG 18
WC Geosciences, Multidisciplinary
SC Geology
GA 621EV
UT WOS:000279558900002
ER
PT J
AU Johnson, LR
AF Johnson, Lane R.
TI An earthquake model with interacting asperities
SO GEOPHYSICAL JOURNAL INTERNATIONAL
LA English
DT Article
DE Earthquake dynamics; Seismicity and tectonics; Fractures and faults
ID SMALL REPEATING EARTHQUAKES; 2004 PARKFIELD EARTHQUAKE; LOMA-PRIETA
EARTHQUAKE; CRITICAL SLIP DISTANCE; STRONG-MOTION; INTERPLATE
EARTHQUAKES; CALIFORNIA EARTHQUAKE; SEISMIC RADIATION; GREENS-FUNCTION;
RUPTURE PROCESS
AB P>A model is presented that treats an earthquake as the failure of asperities in a manner consistent with modern concepts of sliding friction. The mathematical description of the model includes results for elliptical and circular asperities, oblique tectonic slip, static and dynamic solutions for slip on the fault, stress intensity factors, strain energy and second-order moment tensor. The equations that control interaction of asperities are derived and solved both in a quasi-static tectonic mode when none of the asperities are in the process of failing and a dynamic failure mode when asperities are failing and sending out slip pulses that can trigger failure of additional asperities. The model produces moment rate functions for each asperity failure so that, given an appropriate Green function, the radiation of elastic waves is a straightforward calculation. The model explains an observed scaling relationship between repeat time and seismic moment for repeating seismic events and is consistent with the properties of pseudo-tachylites treated as fossil asperities. Properties of the model are explored with simulations of seismic activity that results when a section of the fault containing a spatial distribution of asperities is subjected to tectonic slip. The simulations show that the failure of a group of strongly interacting asperities satisfies the same scaling relationship as the failure of individual asperities, and that realistic distributions of asperities on a fault plane lead to seismic activity consistent with probability estimates for the interaction of asperities and predicted values of the Gutenberg-Richter a and b values. General features of the model are the exterior crack solution as a theoretical foundation, a heterogeneous state of stress and strength on the fault, dynamic effects controlled by propagating slip pulses and radiated elastic waves with a broad frequency band.
C1 Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Computat Seismol, Berkeley, CA 94720 USA.
RP Johnson, LR (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Ctr Computat Seismol, Berkeley, CA 94720 USA.
EM LRJohnson@lbl.gov
FU US Department of Energy [DE-AC02-05CH11231]; DOE Office of Basic Energy
Sciences
FX The earthquake data in Fig. 2 are based on original observations by Bob
Nadeau and the pseudo-tachylite data are based on original observations
by Rudy Wenk. Calculations were performed at the Center for
Computational Seismology (CCS) at LBNL, which is operated by the
University of California for the US Department of Energy under contract
No. DE-AC02-05CH11231, and the research is supported by the DOE Office
of Basic Energy Sciences.
NR 66
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U1 1
U2 11
PU OXFORD UNIV PRESS
PI OXFORD
PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
SN 0956-540X
EI 1365-246X
J9 GEOPHYS J INT
JI Geophys. J. Int.
PD SEP
PY 2010
VL 182
IS 3
BP 1339
EP 1373
DI 10.1111/j.1365-246X.2010.04680.x
PG 35
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 639TP
UT WOS:000280997700018
ER
PT J
AU Harris, DB
Kvaerna, T
AF Harris, David B.
Kvaerna, Tormod
TI Superresolution with seismic arrays using empirical matched field
processing
SO GEOPHYSICAL JOURNAL INTERNATIONAL
LA English
DT Article
DE Time series analysis; Persistence; memory; correlations; clustering;
Seismic monitoring and test-ban treaty verification; Body waves;
Statistical seismology; Wave scattering and diffraction
ID FORM CROSS-CORRELATION; TIME FOURIER-ANALYSIS; CALIFORNIA; EVENTS;
COMMUNICATION
AB P>Scattering and refraction of seismic waves can be exploited with empirical-matched field processing of array observations to distinguish sources separated by much less than the classical resolution limit. To describe this effect, we use the term 'superresolution', a term widely used in the optics and signal processing literature to denote systems that break the diffraction limit. We illustrate superresolution with Pn signals recorded by the ARCES array in northern Norway, using them to identify the origins with 98.2 per cent accuracy of 549 explosions conducted by closely spaced mines in northwest Russia. The mines are observed at 340-410 km range and are separated by as little as 3 km. When viewed from ARCES many are separated by just tenths of a degree in azimuth. This classification performance results from an adaptation to transient seismic signals of techniques developed in underwater acoustics for localization of continuous sound sources. Matched field processing is a potential competitor to frequency-wavenumber (FK) and waveform correlation methods currently used for event detection, classification and location. It operates by capturing the spatial structure of wavefields incident from a particular source in a series of narrow frequency bands. In the rich seismic scattering environment, closely spaced sources far from the observing array nonetheless produce distinct wavefield amplitude and phase patterns across the small array aperture. With observations of repeating events, these patterns can be calibrated over a wide band of frequencies (e.g. 2.5-12.5 Hz) for use in a power estimation technique similar to frequency-wavenumber analysis. The calibrations enable coherent processing at high frequencies at which wavefields normally are considered incoherent under a plane-wave model.
C1 [Harris, David B.] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
[Kvaerna, Tormod] NORSAR, N-2027 Kjeller, Norway.
RP Harris, DB (reprint author), Lawrence Livermore Natl Lab, 7000 East Ave, Livermore, CA 94550 USA.
EM oregondsp@gmail.com
OI Kvaerna, Tormod/0000-0003-4435-257X
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]; NORSAR [DE-FC52-05NA26604]
FX This work performed under the auspices of the U.S. Department of Energy
by Lawrence Livermore National Laboratory under contract
DE-AC52-07NA27344 and NORSAR under contract DE-FC52-05NA26604. The
authors thank Steve Myers, Bill Walter and Frode Ringdal for their help
and suggestions, and Jerry Sweeney for his careful review of the
manuscript. The authors also thank three anonymous reviewers for their
careful reviews and comments, which significantly improved the
manuscript.
NR 27
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U1 1
U2 12
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0956-540X
J9 GEOPHYS J INT
JI Geophys. J. Int.
PD SEP
PY 2010
VL 182
IS 3
BP 1455
EP 1477
DI 10.1111/j.1365-246X.2010.04684.x
PG 23
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 639TP
UT WOS:000280997700025
ER
PT J
AU Maxwell, SC
Rutledge, J
Jones, R
Fehler, M
AF Maxwell, S. C.
Rutledge, J.
Jones, R.
Fehler, M.
TI Petroleum reservoir characterization using downhole microseismic
monitoring
SO GEOPHYSICS
LA English
DT Article
ID VALLEY GAS-FIELD; HYDRAULIC STIMULATION; INDUCED SEISMICITY;
GRANITIC-ROCKS; MICROEARTHQUAKES; CALIFORNIA; INVERSION; MIGRATION;
LOCATION; PATTERNS
AB Imaging of microseismic data is the process by which we use information about the source locations, timing, and mechanisms of the induced seismic events to make inferences about the structure of a petroleum reservoir or the changes that accompany injections into or production from the reservoir. A few key projects were instrumental in the development of downhole microseismic imaging.. Most recent microseismic projects involve imaging hydraulic-fracture stimulations, which has grown into a widespread fracture diagnostic technology. This growth in the application of the technology is attributed to the success of imaging the fracture complexity of the Barnett Shale in the Fort Worth basin, Texas, and the commercial value of the information obtained to improve completions and ultimately production in the field. The use of commercial imaging in the Barnett is traced back to earlier investigations to prove the technology with the Cotton Valley imaging project and earlier experiments at the M-Site in the Piceance basin, Colorado. Perhaps the earliest example of microseismic imaging using data from downhole recording was a hydraulic fracture monitored in 1974, also in the Piceance basin. However, early work is also documented where investigators focused on identifying microseismic trace characteristics without attempting to locate the microseismic sources. Applications of microseismic reservoir monitoring can be tracked from current steam-injection imaging, deformation associated with reservoir compaction in the Yibal field in Oman and the Ekofisk and Valhall fields in the North Sea, and production-induced activity in Kentucky, U.S.A.
C1 [Maxwell, S. C.] Schlumberger, Hydraul Fracture Monitoring, Calgary, AB, Canada.
[Rutledge, J.] Los Alamos Natl Lab, Geophys Grp, Los Alamos, NM USA.
[Jones, R.] Schlumberger Cambridge Res Ltd, Cambridge CB3 0HG, England.
[Fehler, M.] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA.
RP Maxwell, SC (reprint author), Schlumberger, Hydraul Fracture Monitoring, Calgary, AB, Canada.
EM smaxwell@slb.com; jrutledge@lanl.gov; rjones23@s1b.com; fehler@mit.edu
NR 66
TC 66
Z9 75
U1 6
U2 50
PU SOC EXPLORATION GEOPHYSICISTS
PI TULSA
PA 8801 S YALE ST, TULSA, OK 74137 USA
SN 0016-8033
J9 GEOPHYSICS
JI Geophysics
PD SEP-OCT
PY 2010
VL 75
IS 5
BP A129
EP A137
DI 10.1190/1.3477966
PG 9
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 680SJ
UT WOS:000284254400009
ER
PT J
AU Pham, ND
Igel, H
de la Puente, J
Kaser, M
Schoenberg, MA
AF Pham, Nguyen Dinh
Igel, Heiner
de la Puente, Josep
Kaeser, Martin
Schoenberg, Michael A.
TI Rotational motions in homogeneous anisotropic elastic media
SO GEOPHYSICS
LA English
DT Article
ID TRANSVERSELY ISOTROPIC MEDIA; DISCONTINUOUS GALERKIN METHOD; RING LASER
MEASUREMENTS; UNSTRUCTURED MESHES; SEISMIC ANISOTROPY; GROUND MOTIONS;
WAVES; POLARIZATION; PARAMETERS; VELOCITY
AB Rotational motions in homogeneous anisotropic elastic media are studied under the assumption of plane wave propagation. The main goal is to investigate the influences of anisotropy in the behavior of the rotational wavefield. The focus is on P-waves that theoretically do not generate rotational motion in isotropic media. By using the Kelvin-Christoffel equation, expressions are obtained of the rotational motions of body waves as a function of the propagation direction and the coefficients of the elastic modulus matrix. As a result, the amplitudes of the rotation rates and their radiation patterns are quantified and it is concluded that (1) for strong local earthquakes and typical reservoir situations quasi P-rotation rates induced by anisotropy are significant, recordable, and can be used for inverse problems; and (2) for teleseismic wavefields, anisotropic effects are unlikely to be responsible for the observed rotational energy in the P coda.
C1 [Pham, Nguyen Dinh; Igel, Heiner; Kaeser, Martin] Univ Munich, Dept Earth & Environm Sci, Geophys Sect, Munich, Germany.
[de la Puente, Josep] Inst Ciencias Mar, Barcelona Ctr Subsurface Imaging, Dept Marine Geol, E-08039 Barcelona, Spain.
[Schoenberg, Michael A.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA.
RP Pham, ND (reprint author), Vietnam Acad Sci & Technol, Inst Geophys, Hanoi, Vietnam.
EM nguyendp@igp-vast.vn
RI Igel, Heiner/E-9580-2010; de la Puente, Josep/G-3165-2015
OI de la Puente, Josep/0000-0003-2608-1526
FU Geophysics Section of Ludwig-Maximilians-Universitat Munich; Vietnamese
government, Vietnam's National Foundation for Science and Technology
Development [322]; German Academic Exchange Service (DAAD); Repsol-YPF
FX This research was supported by the Geophysics Section of
Ludwig-Maximilians-Universitat Munich, the Vietnamese government
(project 322 and Vietnam's National Foundation for Science and
Technology Development), and the German Academic Exchange Service
(DAAD). We thank the KONWIHR project and the Munich Leibniz
Supercomputing Centre for computational resources and the European Human
Resources Mobility Program (SPICE Project). We thank Mirko van der Baan
and four anonymous reviewers for their suggestions and comments that
helped to improve the manuscript. J. de la Puente acknowledges the
funding of the Kaleidoscope project, supported by Repsol-YPF. H. Igel
thanks Mike Schoenberg, who passed away in 2008, for his early thoughts
on the problem, the discussions they had a few days before his death,
and above all for his friendship and support.
NR 40
TC 3
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U1 0
U2 1
PU SOC EXPLORATION GEOPHYSICISTS
PI TULSA
PA 8801 S YALE ST, TULSA, OK 74137 USA
SN 0016-8033
EI 1942-2156
J9 GEOPHYSICS
JI Geophysics
PD SEP-OCT
PY 2010
VL 75
IS 5
BP D47
EP D56
DI 10.1190/1.3479489
PG 10
WC Geochemistry & Geophysics
SC Geochemistry & Geophysics
GA 680SJ
UT WOS:000284254400022
ER
PT J
AU Cusack, DF
Torn, MS
McDowell, WH
Silver, WL
AF Cusack, Daniela F.
Torn, Margaret S.
McDowell, William H.
Silver, Whendee L.
TI The response of heterotrophic activity and carbon cycling to nitrogen
additions and warming in two tropical soils
SO GLOBAL CHANGE BIOLOGY
LA English
DT Review
DE C turnover; microbial enzymes; oxidative activity; Q(10); radiocarbon;
roots; soil respiration
ID DISSOLVED ORGANIC-CARBON; BELOW-GROUND CARBON; HARVARD FOREST USA;
TEMPERATURE SENSITIVITY; CLIMATE-CHANGE; ELEVATED CO2; PUERTO-RICO;
MATTER DECOMPOSITION; LITTER DECOMPOSITION; ECOSYSTEM RESPONSES
AB Nitrogen (N) deposition is projected to increase significantly in tropical regions in the coming decades, where changes in climate are also expected. Additional N and warming each have the potential to alter soil carbon (C) storage via changes in microbial activity and decomposition, but little is known about the combined effects of these global change factors in tropical ecosystems. In this study, we used controlled laboratory incubations of soils from a long-term N fertilization experiment to explore the sensitivity of soil C to increased N in two N-rich tropical forests. We found that fertilization corresponded to significant increases in bulk soil C concentrations, and decreases in C loss via heterotrophic respiration (P < 0.05). The increase in soil C was not uniform among C pools, however. The active soil C pool decomposed faster with fertilization, while slowly cycling C pools had longer turnover times. These changes in soil C cycling with N additions corresponded to the responses of two groups of microbial extracellular enzymes. Smaller active C pools corresponded to increased hydrolytic enzyme activities; longer turnover times of the slowly cycling C pool corresponded to reduced activity of oxidative enzymes, which degrade more complex C compounds, in fertilized soils. Warming increased soil respiration overall, and N fertilization significantly increased the temperature sensitivity of slowly cycling C pools in both forests. In the lower elevation forest, respired CO2 from fertilized cores had significantly higher delta 14C values than control soils, indicating losses of relatively older soil C. These results indicate that soil C storage is sensitive to both N deposition and warming in N-rich tropical soils, with interacting effects of these two global change factors. N deposition has the potential to increase total soil C stocks in tropical forests, but the long-term stability of this added C will likely depend on future changes in temperature.
C1 [Cusack, Daniela F.; Silver, Whendee L.] Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA.
[Torn, Margaret S.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[McDowell, William H.] Univ New Hampshire, Dept Nat Resources & Environm, Durham, NH 03824 USA.
RP Cusack, DF (reprint author), Univ Calif Santa Barbara, Dept Geog, 1832 Ellison Hall, Santa Barbara, CA 93106 USA.
EM dcusack@geog.ucsb.edu
RI yang, lixia/D-7815-2011; Silver, Whendee/H-1118-2012; McDowell,
William/E-9767-2010; Torn, Margaret/D-2305-2015
OI McDowell, William/0000-0002-8739-9047;
FU NSF; University of California - Berkeley Atmospheric Sciences Center;
Luquillo LTER NSF [DEB 0543558]; USDA [9900975]; NSF [DEB 0620910];
Climate Change Research Division of the U.S. Department of Energy
[DE-AC02-05CH11231]; International Institute of Tropical Forestry, USDA
Forest Service
FX We thank C. Castanha, J. Merriam, A. Thompson, and S. Weintraub for
assistance in the field and laboratory. Funding was provided by an NSF
Graduate Student Research Fellowship, an NSF Doctoral Dissertation
Improvement Grant, and a University of California - Berkeley Atmospheric
Sciences Center grant to D.F. Cusack. This research was also supported
by the Luquillo LTER NSF grant DEB 0543558 to W.L. Silver, USDA grant
9900975 to W.H. McDowell, and NSF grant DEB 0620910 to the Institute for
Tropical Ecosystem Studies, University of Puerto Rico, and the
International Institute of Tropical Forestry USDA Forest Service.
Partial support was provided by the Climate Change Research Division of
the U.S. Department of Energy under Contract No. DE-AC02-05CH11231 to
M.S. Torn, by Agricultural Experiment Station funds to W.L. Silver, and
by the International Institute of Tropical Forestry, USDA Forest
Service. R. Rhew and two anonymous reviewers provided insightful
editorial comments.
NR 102
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Z9 67
U1 35
U2 240
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 1354-1013
EI 1365-2486
J9 GLOBAL CHANGE BIOL
JI Glob. Change Biol.
PD SEP
PY 2010
VL 16
IS 9
BP 2555
EP 2572
DI 10.1111/j.1365-2486.2009.02131.x
PG 18
WC Biodiversity Conservation; Ecology; Environmental Sciences
SC Biodiversity & Conservation; Environmental Sciences & Ecology
GA 635CR
UT WOS:000280633700013
ER
PT J
AU O'Brien, SL
Jastrow, JD
Grimley, DA
Gonzalez-Meler, MA
AF O'Brien, Sarah L.
Jastrow, Julie D.
Grimley, David A.
Gonzalez-Meler, Miquel A.
TI Moisture and vegetation controls on decadal-scale accrual of soil
organic carbon and total nitrogen in restored grasslands
SO GLOBAL CHANGE BIOLOGY
LA English
DT Review
DE Bromus inermis; C(4); carbon sequestration; drainage; magnetic
susceptibility; restored prairie; soil organic carbon; total nitrogen
ID CONSERVATION RESERVE PROGRAM; NORTH-AMERICAN GRASSLANDS; LONG-TERM;
MAGNETIC-SUSCEPTIBILITY; TALLGRASS PRAIRIE; SPECIES-DIVERSITY; PLANT
DIVERSITY; GLOBAL PATTERNS; C-13 ABUNDANCE; CLIMATE-CHANGE
AB Revitalization of degraded landscapes may provide sinks for rising atmospheric CO(2), especially in reconstructed prairies where substantial belowground productivity is coupled with large soil organic carbon (SOC) deficits after many decades of cultivation. The restoration process also provides opportunities to study the often-elusive factors that regulate soil processes. Although the precise mechanisms that govern the rate of SOC accrual are unclear, factors such as soil moisture or vegetation type may influence the net accrual rate by affecting the balance between organic matter inputs and decomposition. A resampling approach was used to assess the control that soil moisture and plant community type each exert on SOC and total nitrogen (TN) accumulation in restored grasslands. Five plots that varied in drainage were sampled at least four times over two decades to assess SOC, TN, and C(4)- and C(3)-derived C. We found that higher long-term soil moisture, characterized by low soil magnetic susceptibility, promoted SOC and TN accrual, with twice the SOC and three times the TN gain in seasonally saturated prairies compared with mesic prairies. Vegetation also influenced SOC and TN recovery, as accrual was faster in the prairies compared with C(3)-only grassland, and C(4)-derived C accrual correlated strongly to total SOC accrual but C(3)-C did not. High SOC accumulation at the surface (0-10 cm) combined with losses at depth (10-20 cm) suggested these soils are recovering the highly stratified profiles typical of remnant prairies. Our results suggest that local hydrology and plant community are critical drivers of SOC and TN recovery in restored grasslands. Because these factors and the way they affect SOC are susceptible to modification by climate change, we contend that predictions of the C-sequestration performance of restored grasslands must account for projected climatic changes on both soil moisture and the seasonal productivity of C(4) and C(3) plants.
C1 [O'Brien, Sarah L.; Gonzalez-Meler, Miquel A.] Univ Illinois, Dept Biol Sci, Chicago, IL 60607 USA.
[O'Brien, Sarah L.; Jastrow, Julie D.] Argonne Natl Lab, Biosci Div, Argonne, IL 60439 USA.
[Grimley, David A.] Univ Illinois, Illinois State Geol Survey, Inst Nat Resource Sustainabil, Champaign, IL 61820 USA.
RP O'Brien, SL (reprint author), Univ Illinois, Dept Biol Sci, 845 W Taylor St M-C 066, Chicago, IL 60607 USA.
EM sobrie1@uic.edu
RI O'Brien, Sarah/C-5596-2011;
OI Gonzalez-Meler, Miquel/0000-0001-5388-7969
FU Department of Energy; University of Illinois at Chicago; U.S. Department
of Energy, Office of Science, Office of Biological and Environmental
Research, Climate and Environmental Sciences Division
[DE-AC02-06CH11357]
FX S. L. O. was supported by a Department of Energy Global Change Education
Program Graduate Research Environmental Fellowship and a University of
Illinois at Chicago Graduate Fellowship. This work was supported by the
U.S. Department of Energy, Office of Science, Office of Biological and
Environmental Research, Climate and Environmental Sciences Division
under contract DE-AC02-06CH11357 to Argonne National Laboratory. We wish
to thank Fermilab NERP coordinator Rod Walton and Fermilab personnel who
worked with Bob Betz to establish and maintain the prairies, especially
Mike Becker, Bob Lootens, and Dave Schemanske. We also thank the
Gonzalez-Meler lab group, Colleen Iversen, Roser Matamala, Larry
Tieszen, and two anonymous reviewers for helpful comments on earlier
drafts of this manuscript. We are grateful to Mike Miller, Kelly Moran,
Susan Kirt, and Tim Vugteveen for helpful discussions and assistance in
the field and lab and to Sergey Olyenik and Rebecca Trueman for help
with IRMS analyses at UIC. Lastly, we are indebted to the numerous
student and teacher research participants whose field and laboratory
work with the Terrestrial Ecology Group at Argonne National Laboratory
created the 1985-1999 archived samples and datasets that enabled this
study.
NR 105
TC 22
Z9 32
U1 7
U2 69
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1354-1013
J9 GLOBAL CHANGE BIOL
JI Glob. Change Biol.
PD SEP
PY 2010
VL 16
IS 9
BP 2573
EP 2588
DI 10.1111/j.1365-2486.2009.02114.x
PG 16
WC Biodiversity Conservation; Ecology; Environmental Sciences
SC Biodiversity & Conservation; Environmental Sciences & Ecology
GA 635CR
UT WOS:000280633700014
ER
PT J
AU Newcomer, DR
Bjornstad, BN
Vermeul, VR
AF Newcomer, D. R.
Bjornstad, B. N.
Vermeul, V. R.
TI Vertical Wellbore Flow Monitoring for Assessing Spatial and Temporal
Flow Relationships with a Dynamic River Boundary
SO GROUND WATER MONITORING AND REMEDIATION
LA English
DT Article
ID ELECTROMAGNETIC BOREHOLE FLOWMETER; LONG-SCREEN WELLS; AQUIFER RESPONSE;
BIAS; PENETRATION; HYDRAULICS; SHALLOW; STREAM; STAGE
AB A useful tool for identifying the temporal and spatial ambient wellbore flow relationships near a dynamic river boundary is to monitor ambient vertical wellbore flow with an electromagnetic borehole flowmeter. This is important because the presence of the wellbore can result in significant mixing or exchange of groundwater vertically across the aquifer. Mixing or exchanging groundwater within the well-screen section can have significant impacts on the distribution of contaminants within the aquifer and adverse effects on the representativeness of groundwater samples collected from the monitoring well. Ambient monitoring data, collected from long screened wells at Hanford's 300-Area Integrated Field Research Challenge site, located approximately 260 m from the Columbia River, demonstrate that vertical wellbore flow exhibits both a positive and inverse temporal relationship with periodic river-stage fluctuations that can change over short distances between wells. The spatial distribution of these vertical flows across the well field indicates two general regions of ambient wellbore flow behavior. The western region of the site is characterized by vertical flows that are positively related to river-stage fluctuations. In contrast, the eastern region of the site exhibits vertical flows that are inversely related to river-stage fluctuations. The cause of this opposite relationship is not completely understood; however, the positive relationships appear to be associated with high-energy Hanford formation flood deposits. These flood deposits have a well-defined northwest-southeast trend and are believed to coincide with a local paleochannel. The inverse relationships are attributed to an erosional, subsurface high in the Hanford/Ringold Formation contact between the site and the Columbia River. Under these complex hydrogeologic and hydrodynamic conditions, the behavior of ambient vertical wellbore flow in monitoring wells near a dynamic river boundary can have important implications for collecting groundwater-quality samples, for contributing to contaminant distribution within an aquifer system, and for implementing effective remediation strategies.
C1 [Newcomer, D. R.; Bjornstad, B. N.; Vermeul, V. R.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Newcomer, DR (reprint author), Pacific NW Natl Lab, POB 999,MS K6-96, Richland, WA 99352 USA.
EM Darrell.newcomer@pnl.gov
FU U.S. Department of Energy, Office of Science, Climate and Environmental
Sciences Division; U.S. Department of Energy [DE-AC05-76RL01830]
FX Funding for this study and paper presentation was provided by the U.S.
Department of Energy, Office of Science, Climate and Environmental
Sciences Division. The authors would like to acknowledge Frank Spane for
providing review comments, Wayne Cosby for editorial support, Dave
Lanigan and Mark Rockhold for graphics, and Kyle Parker, Rob Mackley,
and Robert Edrington for field data collection activities. Finally, Bill
Waldrop of Quantum Engineering Corporation is acknowledged for providing
EBF technical support. Pacific Northwest National Laboratory is operated
for the U.S. Department of Energy by Battelle under Contract
DE-AC05-76RL01830.
NR 27
TC 7
Z9 7
U1 1
U2 13
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1069-3629
J9 GROUND WATER MONIT R
JI Ground Water Monit. Remediat.
PD FAL
PY 2010
VL 30
IS 4
BP 123
EP 135
DI 10.1111/j.1745-6592.2010.01304.x
PG 13
WC Water Resources
SC Water Resources
GA 678XS
UT WOS:000284117400011
ER
PT J
AU Fisher, DR
Weller, RE
AF Fisher, Darrell R.
Weller, Richard E.
TI CARCINOGENESIS FROM INHALED (PuO2)-Pu-239 IN BEAGLES: EVIDENCE FOR
RADIATION HOMEOSTASIS AT LOW DOSES?
SO HEALTH PHYSICS
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Health Effects of Incorporated
Radionuclides
CY MAY, 2009
CL Santa Fe, NM
DE alpha particles; analysis, risk; dogs; Pu-239
ID PLUTONIUM WORKERS; LUNG-CANCER; DOGS; HORMESIS
AB From the early 1970's to the late 1980's, Pacific Northwest National Laboratory conducted life-span studies in beagle dogs on the biological effects of inhaled plutonium ((PuO2)-Pu-238, (PuO2)-Pu-239, and Pu-239[NO3](4)) to help predict risks associated with accidental intakes in workers. Years later, the purpose of the present follow-up study was to reassess the dose-response relationship for lung cancer in the (PuO2)-Pu-239 dogs compared to controls-with particular focus on the dose-response at relatively low lung doses. A (PuO2)-Pu-239 aerosol (2.3 mu m activity-median aerodynamic diameter, 1.9 mu m geometric standard deviation) was administered to six groups of 20 young (18-mo-old) beagle dogs (10 males and 10 females) by inhalation at six different activity levels, as previously described in Laboratory reports. Control dogs were sham-exposed. In dose level 1, initial pulmonary lung depositions were 130 +/- 48 Bq (3.5 +/- 1.3 nCi), corresponding to 1 Bq g(-1) lung tissue (0.029 +/- 0.001 nCi g(-1)). Groups 2 through 6 received initial lung depositions (mean values) of 760, 2,724, 10,345, 37,900, and 200,000 Bq (22, 79, 300, 1,100, and 5,800 nCi) (PuO2)-Pu-239, respectively. For each dog, the absorbed dose to lungs was calculated from the initial lung burden and the final lung burden at time of death and lung mass, assuming a single, long-term retention function. Insoluble plutonium oxide exhibited long retention times in the lungs. Increased dose-dependent mortality due to lung cancer (bronchiolar-alveolar carcinoma, adenocarcinoma, and epidermoid carcinoma) and radiation pneumonitis (in the highest exposure group) were observed in dogs exposed to (PuO2)-Pu-239. Calculated lung doses ranged from a few cGy (lowest exposure level) to 7,764 cGy in dogs that experienced early deaths from radiation pneumonitis. Data were regrouped by lifetime lung dose and plotted as a function of lung tumor incidence. The lung tumor incidence in controls and zero-dose exposed dogs was 18% (5/28). However, no lung tumors were observed in 16 dogs with the lowest lung doses (8 to 22 cGy, mean 14.4 +/- 7.6 cGy), and only one lung tumor was observed in the next 10 dogs with lung doses ranging from 27 to 48 cGy (mean 37.5 +/- 10.9 cGy). By least-squares analysis, a pure-quadratic function represented the overall dose-response (n = 137, r = 0.96) with no apparent dose-related threshold. Reducing this function to three linear dose-response components, we calculated risk coefficients for each. However, the incidence of lung tumors at zero dose was significantly greater than the incidence at low dose ( at the p <= 0.053 confidence level), suggesting a protective effect ( radiation homeostasis) of alpha-particle radiation from (PuO2)-Pu-239. If a threshold for lung cancer incidence exists, it will be observed in the range 15 to 40 cGy. Health Phys. 99(3):357-362; 2010
C1 [Fisher, Darrell R.] Pacific NW Natl Lab, Isotope Sci Program, Richland, WA 99352 USA.
RP Fisher, DR (reprint author), Pacific NW Natl Lab, Isotope Sci Program, 902 Battelle Blvd, Richland, WA 99352 USA.
EM dr.fisher@pnl.gov
NR 23
TC 5
Z9 6
U1 0
U2 3
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0017-9078
EI 1538-5159
J9 HEALTH PHYS
JI Health Phys.
PD SEP
PY 2010
VL 99
IS 3
BP 357
EP 362
DI 10.1097/HP.0b013e3181bfa16b
PG 6
WC Environmental Sciences; Public, Environmental & Occupational Health;
Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical
Imaging
SC Environmental Sciences & Ecology; Public, Environmental & Occupational
Health; Nuclear Science & Technology; Radiology, Nuclear Medicine &
Medical Imaging
GA 637RO
UT WOS:000280836600011
PM 20699697
ER
PT J
AU Levitskaia, TG
Creim, JA
Curry, TL
Luders, T
Morris, JE
Peterson, JM
Thrall, KD
AF Levitskaia, Tatiana G.
Creim, Jeffrey A.
Curry, Terry L.
Luders, Teresa
Morris, James E.
Peterson, James M.
Thrall, Karla D.
TI BIOMATERIALS FOR THE DECORPORATION OF Sr-85 IN THE RAT
SO HEALTH PHYSICS
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Health Effects of Incorporated
Radionuclides
CY MAY, 2009
CL Santa Fe, NM
DE chelation; fallout; radiation, medical; Sr-90
ID INTESTINAL CALCIUM-ABSORPTION; SODIUM ALGINATE; STRONTIUM ABSORPTION;
RADIOSTRONTIUM; INHIBITION; SR-90; BODY; VIVO
AB Although four stable isotopes of strontium occur naturally, Sr-90 is produced by nuclear fission and is present in surface soil around the world as a result of fallout from atmospheric nuclear weapons tests. It can easily transfer to humans in the event of a nuclear/radiological emergency or through the plant-animal-human food chain causing long-term exposures. Strontium is chemically and biologically similar to calcium, and is incorporated primarily into bone following internal deposition. Alginic acid (alginate) obtained from seaweed (kelp) extract selectively binds ingested strontium in the gastrointestinal tract blocking its systemic uptake and reducing distribution to bone in rats, while other natural polysaccharides including chitosan and hyaluronic acid had little in vivo affinity for strontium. Alginate exhibits the unique ability to discriminate between strontium and calcium and has been previously shown to reduce intestinal absorption and skeletal retention of strontium without changing calcium metabolism. In our studies, the effect of commercially available alginate on intestinal absorption of strontium was examined. One problem associated with alginate treatment is its limited solubility and gel formation in water. The aqueous solubility of sodium alginate was improved in a sodium chloride/sodium bicarbonate electrolyte solution containing low molecular weight polyethylene glycol (PEG). Furthermore, oral administration of the combined alginate/electrolyte/PEG solution accelerated removal of internal strontium in rats when compared to treatment with individual sodium alginate/electrolyte or electrolyte/PEG solutions. Importantly, both alginate and PEG are nontoxic, readily available materials that can be easily administered orally in case of a national emergency when potentially large numbers of the population may require medical treatment for internal depositions. Our results suggest further studies to optimize in vivo decorporation performance of engineered alginate material via modification of its chemical and physicochemical properties are warranted. Health Phys. 99(3):394-400; 2010
C1 [Levitskaia, Tatiana G.; Thrall, Karla D.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Levitskaia, TG (reprint author), Pacific NW Natl Lab, POB 999,MSIN P7-22, Richland, WA 99352 USA.
EM Tatiana.levitskaia@pnl.gov
FU NIAID NIH HHS [1R01AI074067-01]
NR 25
TC 3
Z9 3
U1 1
U2 11
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0017-9078
EI 1538-5159
J9 HEALTH PHYS
JI Health Phys.
PD SEP
PY 2010
VL 99
IS 3
BP 394
EP 400
DI 10.1097/HP.0b013e3181c4717d
PG 7
WC Environmental Sciences; Public, Environmental & Occupational Health;
Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical
Imaging
SC Environmental Sciences & Ecology; Public, Environmental & Occupational
Health; Nuclear Science & Technology; Radiology, Nuclear Medicine &
Medical Imaging
GA 637RO
UT WOS:000280836600017
PM 20699703
ER
PT J
AU Abergel, RJ
Durbin, PW
Kullgren, B
Ebbe, SN
Xu, JD
Chang, PY
Bunin, DI
Blakely, EA
Bjornstad, KA
Rosen, CJ
Shuh, DK
Raymond, KN
AF Abergel, Rebecca J.
Durbin, Patricia W.
Kullgren, Birgitta
Ebbe, Shirley N.
Xu, Jide
Chang, Polly Y.
Bunin, Deborah I.
Blakely, Eleanor A.
Bjornstad, Kathleen A.
Rosen, Chris J.
Shuh, David K.
Raymond, Kenneth N.
TI BIOMIMETIC ACTINIDE CHELATORS: AN UPDATE ON THE PRECLINICAL DEVELOPMENT
OF THE ORALLY ACTIVE HYDROXYPYRIDONATE DECORPORATION AGENTS
3,4,3-LI(1,2-HOPO) AND 5-LIO(ME-3,2-HOPO)
SO HEALTH PHYSICS
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Health Effects of Incorporated
Radionuclides
CY MAY, 2009
CL Santa Fe, NM
DE actinides; chelation; contamination, internal; toxicology
ID SEQUESTERING AGENTS; IN-VIVO; LIGANDS; CATECHOLATE; MICE
AB The threat of a dirty bomb or other major radiological contamination presents a danger of large-scale radiation exposure of the population. Because major components of such contamination are likely to be actinides, actinide decorporation treatments that will reduce radiation exposure must be a priority. Current therapies for the treatment of radionuclide contamination are limited and extensive efforts must be dedicated to the development of therapeutic, orally bioavailable, actinide chelators for emergency medical use. Using a biomimetic approach based on the similar biochemical properties of plutonium(IV) and iron(III), siderophore-inspired multidentate hydroxypyridonate ligands have been designed and are unrivaled in terms of actinide-affinity, selectivity, and efficiency. A perspective on the preclinical development of two hydroxypyridonate actinide decorporation agents, 3,4,3-LI( 1,2-HOPO) and 5-LIO(Me-3,2-HOPO), is presented. The chemical syntheses of both candidate compounds have been optimized for scale-up. Baseline preparation and analytical methods suitable for manufacturing large amounts have been established. Both ligands show much higher actinide-removal efficacy than the currently approved agent, diethylenetriaminepentaacetic acid (DTPA), with different selectivity for the tested isotopes of plutonium, americium, uranium and neptunium. No toxicity is observed in cells derived from three different human tissue sources treated in vitro up to ligand concentrations of 1 mM, and both ligands were well tolerated in rats when orally administered daily at high doses (>100 mu mol kg(-1) d(-1)) over 28 d under good laboratory practice guidelines. Both compounds are on an accelerated development pathway towards clinical use. Health Phys. 99(3):401-407; 2010
C1 [Abergel, Rebecca J.; Durbin, Patricia W.; Kullgren, Birgitta; Ebbe, Shirley N.; Shuh, David K.; Raymond, Kenneth N.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Glenn T Seaborg Ctr, Berkeley, CA 94720 USA.
[Xu, Jide; Raymond, Kenneth N.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA.
[Chang, Polly Y.; Bunin, Deborah I.] SRI Int, Menlo Pk, CA 94025 USA.
[Chang, Polly Y.; Blakely, Eleanor A.; Bjornstad, Kathleen A.; Rosen, Chris J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Life Sci, Berkeley, CA 94720 USA.
RP Abergel, RJ (reprint author), Univ Calif Berkeley, Lawrence Berkeley Lab, Div Chem Sci, Glenn T Seaborg Ctr, Berkeley, CA 94720 USA.
EM rjabergel@lbl.gov
FU NIAID NIH HHS [R01 AI074065, R01 AI074065-01]
NR 17
TC 32
Z9 35
U1 4
U2 27
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0017-9078
EI 1538-5159
J9 HEALTH PHYS
JI Health Phys.
PD SEP
PY 2010
VL 99
IS 3
BP 401
EP 407
DI 10.1097/HP.0b013e3181c21273
PG 7
WC Environmental Sciences; Public, Environmental & Occupational Health;
Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical
Imaging
SC Environmental Sciences & Ecology; Public, Environmental & Occupational
Health; Nuclear Science & Technology; Radiology, Nuclear Medicine &
Medical Imaging
GA 637RO
UT WOS:000280836600018
PM 20699704
ER
PT J
AU Yantasee, W
Sangvanich, T
Creim, JA
Pattamakomsan, K
Wiacek, RJ
Fryxell, GE
Addleman, RS
Timchalk, C
AF Yantasee, Wassana
Sangvanich, Thanapon
Creim, Jeffery A.
Pattamakomsan, Kanda
Wiacek, Robert J.
Fryxell, Glen E.
Addleman, R. Shane
Timchalk, Charles
TI FUNCTIONAL SORBENTS FOR SELECTIVE CAPTURE OF PLUTONIUM, AMERICIUM,
URANIUM, AND THORIUM IN BLOOD
SO HEALTH PHYSICS
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Health Effects of Incorporated
Radionuclides
CY MAY, 2009
CL Santa Fe, NM
DE actinides; adsorption; radiological terrorism; uranium
ID SELF-ASSEMBLED MONOLAYERS; MESOPOROUS SUPPORTS; ACTINIDE SEQUESTRATION;
SILICA; RAT; 3,4,3-LIHOPO; GADOLINIUM; DESIGN; TISSUE; DTPA
AB Self-assembled monolayer on mesoporous supports (SAMMS (TM)) are hybrid materials created from attachment of organic moieties onto very high surface area mesoporous silica. SAMMS with surface chemistries including three isomers of hydroxypyridinone, diphosphonic acid, acetamide phosphonic acid, glycinyl urea, and diethylenetriamine pentaacetate ( DTPA) analog were evaluated for chelation of actinides (Pu-239, Am-241, uranium, thorium) from blood. Direct blood decorporation using sorbents does not have the toxicity or renal challenges associated with traditional chelation therapy and may have potential applications for critical exposure cases, reduction of nonspecific dose during actinide radiotherapy, and for sorbent hemoperfusion in renal insufficient patients, whose kidneys clear radionuclides at a very slow rate. Sorption affinity (K-d), sorption rate, selectivity, and stability of SAMMS were measured in batch contact experiments. An isomer of hydroxypyridinone (3,4-HOPO) on SAMMS demonstrated the highest affinity for all four actinides from blood and plasma and greatly outperformed the DTPA analog on SAMMS and commercial resins. In batch contact, a fifty percent reduction of actinides in blood was achieved within minutes, and there was no evidence of protein fouling or material leaching in blood after 24 h. The engineered form of SAMMS ( bead format) was further evaluated in a 100-fold scaled-down hemoperfusion device and showed no blood clotting after 2 h. A 0.2 g quantity of SAMMS could reduce 50 wt.% of 100 ppb uranium in 50 mL of plasma in 18 min and that of 500 dpm mL(-1) in 24 min. 3,4-HOPO-SAMMS has a long shelf-life in air and at room temperature for at least 8 y, indicating its feasibility for stockpiling in preparedness for an emergency. The excellent efficacy and stability of SAMMS materials in complex biological matrices suggest that SAMMS can also be used as orally administered drugs and for wound decontamination. By changing the organic groups of SAMMS, they can be used not only for actinides but also for other radionuclides. By using the mixture of these SAMMS materials, broad spectrum decorporation of radionuclides is very feasible. Health Phys. 99(3):413-419; 2010
C1 [Yantasee, Wassana] Oregon Hlth & Sci Univ, Portland, OR 97239 USA.
[Sangvanich, Thanapon; Creim, Jeffery A.; Pattamakomsan, Kanda; Wiacek, Robert J.; Fryxell, Glen E.; Addleman, R. Shane; Timchalk, Charles] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Yantasee, W (reprint author), Oregon Hlth & Sci Univ, Portland, OR 97239 USA.
EM yantasee@ohsu.edu
FU NIAID NIH HHS [R01 AI074064, R01 AI074064-01, R01 AI080502, R01
AI074064-01S1]; NIEHS NIH HHS [R21 ES015620-01A1, R21 ES015620, R21
ES015620-02]; NIGMS NIH HHS [R01 GM089918, R01 GM089918-01]
NR 26
TC 9
Z9 12
U1 1
U2 33
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0017-9078
EI 1538-5159
J9 HEALTH PHYS
JI Health Phys.
PD SEP
PY 2010
VL 99
IS 3
BP 413
EP 419
DI 10.1097/HP.0b013e3181ce5f3e
PG 7
WC Environmental Sciences; Public, Environmental & Occupational Health;
Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical
Imaging
SC Environmental Sciences & Ecology; Public, Environmental & Occupational
Health; Nuclear Science & Technology; Radiology, Nuclear Medicine &
Medical Imaging
GA 637RO
UT WOS:000280836600020
PM 20699706
ER
PT J
AU Timchalk, C
Creim, JA
Sukwarotwat, V
Wiacek, R
Addleman, RS
Fryxell, GE
Yantasee, W
AF Timchalk, Charles
Creim, Jeffrey A.
Sukwarotwat, Vichaya
Wiacek, Robert
Addleman, R. Shane
Fryxell, Glen E.
Yantasee, Wassana
TI IN VITRO AND IN VIVO EVALUATION OF A NOVEL FERROCYANIDE FUNCTIONALIZED
NANOPOUROUS SILICA DECORPORATION AGENT FOR CESIUM IN RATS
SO HEALTH PHYSICS
LA English
DT Article; Proceedings Paper
CT 10th International Conference on Health Effects of Incorporated
Radionuclides
CY MAY, 2009
CL Santa Fe, NM
DE absorption; cesium; chelation; pharmacokinetics
ID SELF-ASSEMBLED MONOLAYERS; MESOPOROUS SUPPORTS SAMMS; PRUSSIAN-BLUE;
QUANTITATIVE-DETERMINATION; FERRIC HEXACYANOFERRATE; ACTINIDE
SEQUESTRATION; HEAVY-METALS; HUMAN-BODY; RETENTION; CS-137
AB Novel decorporation agents are being developed to protect against radiological terrorist attacks. These sorbents, known as the self-assembled monolayer on mesoporous supports (SAMMS (TM)), are hybrid materials where differing organic moieties are grafted onto mesoporous silica (SiO2). In vitro experiments focused on the evaluation and optimization of SAMMS for capturing radiocesium (Cs-137); therefore, based on these studies, a ferrocyanide copper (FC-Cu-EDA)-SAMMS was advanced for in vivo evaluation. In vivo experiments were conducted comparing the performance of the SAMMS vs. insoluble Prussian blue. Groups of jugular cannulated rats (4/treatment) were evaluated. Animals in Group I were administered Cs-137 chloride (similar to 40 mu g kg(-1)) by intravenous (i.v.) injection or oral gavage; Group II animals were administered pre-bound Cs-137-SAMMS or sequential Cs-137 chloride + SAMMS (similar to 61 ng kg(-1)) by oral gavage; and Group III was orally administered Cs-137 chloride (similar to 61 ng kg(-1)) followed by either 0.1 g of SAMMS or Prussian blue. Following dosing, the rats were maintained in metabolism cages for 72 h and blood, urine, and fecal samples were collected for Cs-137 analysis (gamma counting). Rats were then humanely euthanized, and selected tissues analyzed. Orally administered Cs-137 chloride was rapidly and well absorbed (similar to 100% relative to i.v. dose), and the pharmacokinetics (blood, urine, feces, and tissues) were very comparable to the i.v. dose group. For both exposures the urine and feces accounted for 20 and 3% of the dose, respectively. The prebound Cs-137-SAMMS was retained primarily within the feces (72% of the dose), with similar to 1.4% detected in the urine, suggesting that the Cs-137 remained tightly bound to SAMMS. SAMMS and Prussian blue both effectively captured available Cs-137 in the gut with feces accounting for 80-88% of the administered dose, while less than 2% was detected in the urine. This study suggests that the functionalized SAMMS outperforms Prussian blue in vitro at low pH, but demonstrates comparable in vivo sequestration efficacy at low exposure concentrations. The comparable response may be the result of the low Cs-137 chloride dose and high sorbent dosage that was utilized. Future studies are planned to optimize the performance of SAMMS in vivo over a broader range of doses and conditions. Health Phys. 99(3):420-429; 2010
C1 [Timchalk, Charles; Creim, Jeffrey A.; Sukwarotwat, Vichaya; Wiacek, Robert; Addleman, R. Shane; Fryxell, Glen E.] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Yantasee, Wassana] OHSU Sch Med, Dept Biomed Engn, Portland, OR 97239 USA.
RP Timchalk, C (reprint author), Pacific NW Natl Lab, MSIN P7-59,902 Battelle Blvd,POB 999, Richland, WA 99352 USA.
EM charles.timchalk@pnl.gov
FU NIAID NIH HHS [R01 AI074064, R01 AI074064-01S1]
NR 38
TC 13
Z9 13
U1 0
U2 14
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 0017-9078
EI 1538-5159
J9 HEALTH PHYS
JI Health Phys.
PD SEP
PY 2010
VL 99
IS 3
BP 420
EP 429
DI 10.1097/HP.0b013e3181bca9b0
PG 10
WC Environmental Sciences; Public, Environmental & Occupational Health;
Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical
Imaging
SC Environmental Sciences & Ecology; Public, Environmental & Occupational
Health; Nuclear Science & Technology; Radiology, Nuclear Medicine &
Medical Imaging
GA 637RO
UT WOS:000280836600021
PM 20699707
ER
PT J
AU Colgan, J
Abdallah, J
Fontes, CJ
Kilcrease, DP
Dunn, J
Purvis, M
Lee, RW
AF Colgan, J.
Abdallah, J., Jr.
Fontes, C. J.
Kilcrease, D. P.
Dunn, J.
Purvis, M.
Lee, R. W.
TI Non-LTE and gradient effects in K-shell oxygen emission laser-produced
plasma
SO HIGH ENERGY DENSITY PHYSICS
LA English
DT Article
DE Non-LTE; Atomic physics; Gradients
ID SPECTRA; ATOMS
AB A recent effort [1] to develop a high-resolution spectroscopy capability for He-like and H-like ions to study far wing shapes from a laser-produced plasma experiment at the Lawrence Livermore National Laboratory found unexpected structure in the observed emission from a Mylar target. In this paper we propose that the observed features are due to exotic inner-shell transitions in mid-ionized oxygen, suggesting that the observed emission arises from two plasma regions: a hotter, less dense outer region gives rise to the observed He-like and H-like resonance lines, while a cooler, more dense plasma region closer to the target surface and in a region surrounding the laser spot generates the dielectronic satellites and the exotic inner-shell lines. Calculations using the Los Alamos suite of atomic physics codes and the plasma kinetics code ATOMIC are used to support this assertion. (C) 2010 Elsevier B.V. All rights reserved.
C1 [Colgan, J.; Abdallah, J., Jr.; Kilcrease, D. P.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
[Fontes, C. J.] Los Alamos Natl Lab, Div Appl Phys, Los Alamos, NM 87545 USA.
[Dunn, J.; Lee, R. W.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
[Purvis, M.] Colorado State Univ, Dept Elect & Comp Engn, Ft Collins, CO 80523 USA.
RP Colgan, J (reprint author), Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA.
EM jcolgan@lanl.gov
OI Colgan, James/0000-0003-1045-3858; Kilcrease, David/0000-0002-2319-5934
FU U.S. Department of Energy [DE-AC52-06NA25396]; U.S. Department of Energy
by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
FX The authors would like to thank S. Hansen for initial atomic kinetic
calculations. Thanks go to E. Magee, K. Cone, L Elberson, J. Emig, J.
Hunter, for experimental, technical and laser support as well as C.
Cadwalader and R. Van Maren for target fabrication. The help of the
Jupiter Laser Facility staff is appreciated. The 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. A portion of this work
performed under the auspices of the U.S. Department of Energy by
Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
NR 22
TC 5
Z9 5
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1574-1818
J9 HIGH ENERG DENS PHYS
JI High Energy Density Phys.
PD SEP
PY 2010
VL 6
IS 3
BP 295
EP 300
DI 10.1016/j.hedp.2010.01.015
PG 6
WC Physics, Fluids & Plasmas
SC Physics
GA 660PC
UT WOS:000282654500001
ER
PT J
AU Schwarz, V
Holst, B
Bornath, T
Fortmann, C
Kraeft, WD
Thiele, R
Redmer, R
Gregori, G
Lee, HJ
Doppner, T
Glenzer, SH
AF Schwarz, Volker
Holst, Bastian
Bornath, Thomas
Fortmann, Carsten
Kraeft, Wolf-Dietrich
Thiele, Robert
Redmer, Ronald
Gregori, Gianluca
Lee, Hae Ja
Doeppner, Tilo
Glenzer, Siegfried H.
TI Static ion structure factor for dense plasmas: Semi-classical and ab
initio calculations
SO HIGH ENERGY DENSITY PHYSICS
LA English
DT Article
DE Structure factor; Dense plasma; Integral equation methods; Quantum
potential; ab initio simulations
ID NUCLEUS-ELECTRON MODEL; X-RAY-SCATTERING; HIGH-TEMPERATURE PLASMA;
EQUATION-OF-STATE; MOLECULAR-DYNAMICS; TRANSPORT-PROPERTIES; THOMSON
SCATTERING; HYDROGEN PLASMAS; LIQUID-METAL; SIMULATION
AB We calculate the static structure factor of dense multi-component plasmas. Large scale ab initio finite-temperature DFT molecular dynamics simulations are performed in order to cover the region where a consistent quantum treatment for the electrons is inevitable. Especially, the behavior at small wave numbers k can be inferred from the relation to the isothermal compressibility. Alternatively, the static structure factor is obtained by solving the integral equations for the pair correlation functions within the hypernetted chain (HNC) scheme. For this purpose we derive new effective two-particle quantum potentials for the interactions between the charge carriers from the full two-particle Slater sum by accounting for bound states. Comparison to the ab initio molecular dynamics simulations enables us to determine the short-range behavior of the effective electron-ion quantum potentials. Results for the static structure factor are presented for beryllium plasmas at solid density and at threefold compression. (C) 2009 Elsevier B.V. All rights reserved.
C1 [Schwarz, Volker; Holst, Bastian; Bornath, Thomas; Fortmann, Carsten; Kraeft, Wolf-Dietrich; Thiele, Robert; Redmer, Ronald] Univ Rostock, Inst Phys, D-18051 Rostock, Germany.
[Gregori, Gianluca] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England.
[Gregori, Gianluca] Rutherford Appleton Lab, Cent Laser Facil, Didcot OX11 0QX, Oxon, England.
[Lee, Hae Ja] SLAC Natl Accelerator Lab, LCLS, Menlo Pk, CA 94025 USA.
[Doeppner, Tilo; Glenzer, Siegfried H.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
RP Bornath, T (reprint author), Univ Rostock, Inst Phys, Univ Pl 3, D-18051 Rostock, Germany.
EM thomas.bornath@uni-rostock.de
RI Holst, Bastian/D-2217-2011; Redmer, Ronald/F-3046-2013;
OI Holst, Bastian/0000-0002-2369-3730; Bornath, Thomas/0000-0003-2831-2586;
Thiele, Robert/0000-0001-8350-9942
FU Deutsche Forschungsgemeinschaft (DFG) [SFB 652]; Bundesministerium fur
Bildung und Forschung (BMBF) [FSP 301-FLASH, KS7HRA]; EPSRC
[EP/G007187/1]; Science and Technology Facilities Council of the United
Kingdom; U.S. Department of Energy by Lawrence Livermore National
Laboratory [DE-AC52-07NA27344]; National Laboratory User Facility,
Laboratory Directed Research and Development [08-ERI-002, 08-LW-004]
FX We thank D.O. Gericke, J. Vorberger, and K. Wunsch for valuable
discussions and M. French for supporting the simulations. VS, BH, TB,
CF, WDK, RT, and RR acknowledge support from the Deutsche
Forschungsgemeinschaft (DFG) within the SFB 652 "Strong correlations and
collective phenomena in radiation fields: Coulomb systems, clusters, and
particles", and from the Bundesministerium fur Bildung und Forschung
(BMBF) under grant FSP 301-FLASH, project No. KS7HRA. The work of GG was
supported by the EPSRC Grant No. EP/G007187/1 and by the Science and
Technology Facilities Council of the United Kingdom. The work of TD and
SHG was performed under the auspices of the U.S. Department of Energy by
Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344
and also supported by the National Laboratory User Facility, Laboratory
Directed Research and Development grants 08-ERI-002 and 08-LW-004.
NR 54
TC 7
Z9 7
U1 0
U2 13
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1574-1818
J9 HIGH ENERG DENS PHYS
JI High Energy Density Phys.
PD SEP
PY 2010
VL 6
IS 3
BP 305
EP 310
DI 10.1016/j.hedp.2009.11.005
PG 6
WC Physics, Fluids & Plasmas
SC Physics
GA 660PC
UT WOS:000282654500003
ER
PT J
AU Iglesias, CA
AF Iglesias, Carlos A.
TI XUV absorption by solid-density aluminum
SO HIGH ENERGY DENSITY PHYSICS
LA English
DT Article
DE Warm dense matter; Inverse bremsstrahlung; Opacity
ID HARD SPHERES; PLASMA; CONDUCTIVITY; PHOTOABSORPTION; TRANSMISSION;
SCATTERING; EQUATION
AB An inverse bremsstrahlung model for plasmas and simple metals that approximates the cold. solid Al experimental data below the L-edge is applied to matter conditions relevant to XUV laser applications. The model involves an all-order calculation using a semi-analytical effective electron-ion interaction. The predicted increases in XUV absorption with rising temperature occur via two effects: increased availability of final states from reduced electron degeneracy and a stronger electron-ion interaction from reduced screening. (C) 2010 Elsevier B.V. All rights reserved.
C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Iglesias, CA (reprint author), Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA.
EM iglesias1@llnl.gov
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]
FX Thanks are due to Sam M. Vinko for providing their calculations in
tabular form. This work performed under the auspices of the U.S.
Department of Energy by Lawrence Livermore National Laboratory under
Contract DE-AC52-07NA27344.
NR 29
TC 9
Z9 9
U1 0
U2 6
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1574-1818
J9 HIGH ENERG DENS PHYS
JI High Energy Density Phys.
PD SEP
PY 2010
VL 6
IS 3
BP 311
EP 317
DI 10.1016/j.hedp.2010.01.004
PG 7
WC Physics, Fluids & Plasmas
SC Physics
GA 660PC
UT WOS:000282654500004
ER
PT J
AU Iglesias, CA
AF Iglesias, Carlos A.
TI Excited spectator electron effects on spectral line shapes
SO HIGH ENERGY DENSITY PHYSICS
LA English
DT Article
DE Line shapes; Opacity
ID DIELECTRONIC SATELLITE LINES; MULTIELECTRON IONS; TRANSITION-ARRAYS;
DENSE-PLASMAS; OPACITIES; MODEL; HOT
AB Excited spectator electron effects on Stark broadened spectral line shapes of transitions involving tightly bound electrons are investigated. It is shown that the interference terms in the electron impact broadening are essential to describe the overlapping lines generated by these configurations (e.g.; dielectronic satellite lines). The main impact is narrower spectral features and reduced far wing intensities compared to calculations neglecting the interference terms. (C) 2010 Elsevier B.V. All rights reserved.
C1 Lawrence Livermore Natl Lab, Livermore, CA 94550 USA.
RP Iglesias, CA (reprint author), Lawrence Livermore Natl Lab, POB 808, Livermore, CA 94550 USA.
EM iglesias1@llnl.gov
FU U.S. Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]
FX It is a pleasure to recognize valuable discussions with John I. Castor
and Richard W. Lee. This work performed under the auspices of the U.S.
Department of Energy by Lawrence Livermore National Laboratory under
Contract DE-AC52-07NA27344.
NR 41
TC 10
Z9 10
U1 0
U2 1
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1574-1818
J9 HIGH ENERG DENS PHYS
JI High Energy Density Phys.
PD SEP
PY 2010
VL 6
IS 3
BP 318
EP 331
DI 10.1016/j.hedp.2010.01.007
PG 14
WC Physics, Fluids & Plasmas
SC Physics
GA 660PC
UT WOS:000282654500005
ER
PT J
AU Chinchor, NA
Thomas, JJ
Wong, PC
Christel, MG
Ribarsky, W
AF Chinchor, Nancy A.
Thomas, James J.
Wong, Pak Chung
Christel, Michael G.
Ribarsky, William
TI Multimedia Analysis plus Visual Analytics = Multimedia Analytics
SO IEEE COMPUTER GRAPHICS AND APPLICATIONS
LA English
DT Article
ID OF-THE-ART; RETRIEVAL; IMAGES
C1 [Thomas, James J.; Wong, Pak Chung] Pacific NW Natl Lab, Richland, WA 99352 USA.
[Christel, Michael G.] Carnegie Mellon Univ, Entertainment Technol Ctr, Pittsburgh, PA 15213 USA.
[Ribarsky, William] Univ N Carolina, Dept Comp Sci, Charlotte, NC 28223 USA.
EM chinchoreclectic@gmail.com; jim.thomas@pnl.gov; pak.wong@pnl.gov;
christel@cmu.edu; ribarsky@uncc.edu
FU US National Science Foundation [IIS-0705491]; US National Visualization
and Analytics Center at the Pacific Northwest National Laboratory; US
Department of Energy [DE-AC06-76RL01830]
FX The US National Science Foundation has supported the Informedia research
reported here under grant IIS-0705491. The US National Visualization and
Analytics Center at the Pacific Northwest National Laboratory has also
supported some of the described research. The Battelle Memorial
Institute manages the laboratory for the US Department of Energy under
contract DE-AC06-76RL01830.
NR 20
TC 6
Z9 6
U1 0
U2 4
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA
SN 0272-1716
EI 1558-1756
J9 IEEE COMPUT GRAPH
JI IEEE Comput. Graph. Appl.
PD SEP-OCT
PY 2010
VL 30
IS 5
BP 52
EP 60
PG 9
WC Computer Science, Software Engineering
SC Computer Science
GA 640FY
UT WOS:000281035500009
PM 24807414
ER
PT J
AU Smith, JC
Beuning, S
Durrwachter, H
Ela, E
Hawkins, D
Kirby, B
Lasher, W
Lowell, J
Porter, K
Schuyler, K
Sotkiewicz, P
AF Smith, J. Charles
Beuning, Stephen
Durrwachter, Henry
Ela, Erik
Hawkins, David
Kirby, Brendan
Lasher, Warren
Lowell, Jonathan
Porter, Kevin
Schuyler, Ken
Sotkiewicz, Paul
TI The Wind at Our Backs
SO IEEE POWER & ENERGY MAGAZINE
LA English
DT Article
C1 [Smith, J. Charles] Util Wind Integrat Grp, Reston, VA USA.
[Beuning, Stephen] Xcel Energy, Denver, CO USA.
[Durrwachter, Henry] Luminant Energy Co LLC, Dallas, TX USA.
[Ela, Erik] Natl Renewable Energy Lab, Golden, CO USA.
[Hawkins, David] CAISO, Folsom, CA USA.
[Lasher, Warren] ERCOT, Taylor, TX USA.
[Porter, Kevin] Exeter Associates, Columbia, MD USA.
[Schuyler, Ken; Sotkiewicz, Paul] PJM Interconnect LLC, Valley Forge, PA USA.
RP Smith, JC (reprint author), Util Wind Integrat Grp, Reston, VA USA.
NR 4
TC 9
Z9 9
U1 0
U2 1
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1540-7977
J9 IEEE POWER ENERGY M
JI IEEE Power Energy Mag.
PD SEP-OCT
PY 2010
VL 8
IS 5
BP 63
EP 71
DI 10.1109/MPE.2010.937598
PG 9
WC Engineering, Electrical & Electronic
SC Engineering
GA 668SQ
UT WOS:000283290500007
ER
PT J
AU Porter, R
Fraser, AM
Hush, D
AF Porter, Reid
Fraser, Andrew M.
Hush, Don
TI Wide-Area Motion Imagery [Narrowing the semantic gap]
SO IEEE SIGNAL PROCESSING MAGAZINE
LA English
DT Article
ID RETRIEVAL; TRACKING; VIDEO; MODEL
C1 [Porter, Reid; Fraser, Andrew M.; Hush, Don] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Porter, R (reprint author), Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
EM rporter@lanl.gov; afraser@lanl.gov; dhush@lanl.gov
RI Magazine, Signal Processing/E-9947-2015
FU U.S. Department of Energy
FX We would like to thank Ed Rosten for Figure 4 and Rohan Loveland for
Figure 6. We gratefully acknowledge the support of the U.S. Department
of Energy through the LANL/LDRD Program for this work.
NR 37
TC 21
Z9 21
U1 0
U2 4
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1053-5888
EI 1558-0792
J9 IEEE SIGNAL PROC MAG
JI IEEE Signal Process. Mag.
PD SEP
PY 2010
VL 27
IS 5
BP 56
EP 65
DI 10.1109/MSP.2010.937396
PG 10
WC Engineering, Electrical & Electronic
SC Engineering
GA 668BF
UT WOS:000283242900008
ER
PT J
AU Gaj, K
Kwon, S
Baier, P
Kohlbrenner, P
Le, H
Khaleeluddin, M
Bachimanchi, R
Rogawski, M
AF Gaj, Kris
Kwon, Soonhak
Baier, Patrick
Kohlbrenner, Paul
Le, Hoang
Khaleeluddin, Mohammed
Bachimanchi, Ramakrishna
Rogawski, Marcin
TI Area-Time Efficient Implementation of the Elliptic Curve Method of
Factoring in Reconfigurable Hardware for Application in the Number Field
Sieve
SO IEEE TRANSACTIONS ON COMPUTERS
LA English
DT Article
DE Cipher-breaking; factoring; ECM; FPGA; NFS
AB A novel portable hardware architecture of the Elliptic Curve Method of factoring, designed and optimized for application in the relation collection step of the Number Field Sieve, is described and analyzed. A comparison with an earlier proof-of-concept design by Pelzl et al. has been performed, and a substantial improvement has been demonstrated in terms of both the execution time and the area-time product. The ECM architecture has been ported across five different families of FPGA devices in order to select the family with the best performance to cost ratio. A timing comparison with the highly optimized software implementation, GMP-ECM, has been performed. Our results indicate that low-cost families of FPGAs, such as Spartan-3 and Spartan-3E, offer at least an order of magnitude improvement over the same generation of microprocessors in terms of the performance to cost ratio, without the use of embedded FPGA resources, such as embedded multipliers.
C1 [Gaj, Kris; Kohlbrenner, Paul; Rogawski, Marcin] George Mason Univ, ECE Dept, Fairfax, VA 22030 USA.
[Kwon, Soonhak] Sungkyunkwan Univ, Dept Math, Suwon 440746, South Korea.
[Baier, Patrick] Siemens PLM Software, Alexandria, VA 22308 USA.
[Le, Hoang] Univ So Calif, Dept Elect Engn, Los Angeles, CA 90089 USA.
[Khaleeluddin, Mohammed] Hughes Network Syst, Germantown, MD 20876 USA.
[Bachimanchi, Ramakrishna] Jefferson Lab, Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA.
RP Gaj, K (reprint author), George Mason Univ, ECE Dept, 4400 Univ Dr, Fairfax, VA 22030 USA.
EM kgaj@gmu.edu; shkwon7@gmail.com; districtline@gmx.net; pkohlbr1@gmu.edu;
hoangle@usc.edu; mdkhaleel@gmail.com; bachiman@jlab.org;
mrogawsk@gmu.edu
NR 29
TC 0
Z9 0
U1 0
U2 1
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA
SN 0018-9340
EI 1557-9956
J9 IEEE T COMPUT
JI IEEE Trans. Comput.
PD SEP
PY 2010
VL 59
IS 9
BP 1264
EP 1280
DI 10.1109/TC.2009.191
PG 17
WC Computer Science, Hardware & Architecture; Engineering, Electrical &
Electronic
SC Computer Science; Engineering
GA 628QE
UT WOS:000280134600010
ER
PT J
AU Kroposki, B
Pink, C
DeBlasio, R
Thomas, H
Simoes, M
Sen, PK
AF Kroposki, Benjamin
Pink, Christopher
DeBlasio, Richard
Thomas, Holly
Simoes, Marcelo
Sen, Pankaj K.
TI Benefits of Power Electronic Interfaces for Distributed Energy Systems
SO IEEE TRANSACTIONS ON ENERGY CONVERSION
LA English
DT Article
DE Distributed energy (DE); distributed generation (DG); fault current;
interconnection; interface; inverter; microgrid; power electronics (PE);
power quality
ID GENERATION
AB With the increasing use of distributed energy (DE) systems in industry and its technological advancement, it is becoming more important to understand the integration of these systems with the electric power systems. New markets and benefits for DE applications include the ability to provide ancillary services, improve energy efficiency, enhance power system reliability, and allow customer choice. Advanced power electronic (PE) interfaces will allow DE systems to provide increased functionality through improved power quality and voltage/volt-ampere reactive (VAR) support, increase electrical system compatibility by reducing the fault contributions, and flexibility in operations with various other DE sources, while reducing overall interconnection costs. This paper will examine the system integration issues associated with DE systems and show the benefits of using PE interfaces for such applications.
C1 [Kroposki, Benjamin; Pink, Christopher; DeBlasio, Richard; Thomas, Holly] Natl Renewable Energy Lab, Golden, CO 80401 USA.
[Simoes, Marcelo; Sen, Pankaj K.] Colorado Sch Mines, Golden, CO 80401 USA.
RP Kroposki, B (reprint author), Natl Renewable Energy Lab, Golden, CO 80401 USA.
EM benjamin_kroposki@nrel.gov; christopher_pink@nrel.gov;
richard_deblasio@nrel.gov; holly_thomas@nrel.gov; msimoes@mines.edu;
psen@mines.edu
RI Simoes, Marcelo/J-9600-2012
OI Simoes, Marcelo/0000-0003-4124-061X
FU Department of Energy under Midwest Research Institute (MRI)
[DE-AC36-99GO10337]; California Energy Commission [500-03-011]; National
Science Foundation Power Systems Engineering Research Center
FX Manuscript received September 25, 2006; revised November 16, 2007;
accepted December 30, 2007. Date of publication August 3, 2010; date of
current version August 20, 2010. This work was supported at National
Renewable Energy Laboratory by the Department of Energy under Midwest
Research Institute (MRI) Contract DE-AC36-99GO10337 and by the
California Energy Commission under Technology Partnership Agreement
500-03-011. The work of Dr. Simoes and Dr. Sen was supported by the
National Science Foundation Power Systems Engineering Research Center.
Paper no. TEC-00461-2006.
NR 31
TC 85
Z9 89
U1 1
U2 14
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0885-8969
J9 IEEE T ENERGY CONVER
JI IEEE Trans. Energy Convers.
PD SEP
PY 2010
VL 25
IS 3
BP 901
EP 908
DI 10.1109/TEC.2010.2053975
PG 8
WC Energy & Fuels; Engineering, Electrical & Electronic
SC Energy & Fuels; Engineering
GA 666XI
UT WOS:000283155600036
ER
PT J
AU Wang, S
Maillet, YY
Wang, F
Lai, RX
Luo, F
Boroyevich, D
AF Wang, Shuo
Maillet, Yoann Yorrick
Wang, Fei
Lai, Rixin
Luo, Fang
Boroyevich, Dushan
TI Parasitic Effects of Grounding Paths on Common-Mode EMI Filter's
Performance in Power Electronics Systems
SO IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
LA English
DT Article
DE Electromagnetic-interference (EMI) filter; grounding; inductive
coupling; motor drive; mutual inductance; parasitic
ID PARAMETERS
AB High-frequency common-mode (CM) electromagnetic- interference (EMI) noise is difficult to suppress in electronics systems. EMI filters are used to suppress CM noise, but their performance is greatly affected by the parasitic effects of the grounding paths. In this paper, the parasitic effects of the grounding paths on an EMI filter's performance are investigated in a motor-drive system. The effects of the mutual inductance between two grounding paths are explored. Guidelines for the grounding of CM EMI filters are derived. Simulations and experiments are finally carried out to verify the theoretical analysis.
C1 [Wang, Shuo] Univ Texas San Antonio, Dept Elect & Comp Engn, San Antonio, TX 78249 USA.
[Maillet, Yoann Yorrick] Converteam Inc, Pittsburgh, PA 15238 USA.
[Wang, Fei] Univ Tennessee, Knoxville, TN 37996 USA.
[Wang, Fei] Oak Ridge Natl Lab, Oak Ridge, TN 37830 USA.
[Lai, Rixin] GE Co, GE Global Res Ctr, Niskayuna, NY 12309 USA.
[Luo, Fang] Huazhong Univ Sci & Technol, Wuhan 430074, Peoples R China.
[Boroyevich, Dushan] Virginia Polytech Inst & State Univ, Ctr Power Elect Syst, Blacksburg, VA 24061 USA.
[Boroyevich, Dushan] Virginia Polytech Inst & State Univ, Dept Elect & Comp Engn, Blacksburg, VA 24061 USA.
RP Wang, S (reprint author), Univ Texas San Antonio, Dept Elect & Comp Engn, San Antonio, TX 78249 USA.
EM shuowang@ieee.org; yoayo@vt.edu; fred.wang@utk.edu; lairixin@vt.edu;
kkhust@gmail.com; dushan@vt.edu
RI Luo, Fang/A-9337-2010
FU SAFRAN Group; National Science Foundation (NSF) [EEC-9731677]; Industry
Partnership Program
FX Manuscript received May 12, 2009; revised August 14, 2009 and October 7,
2009; accepted November 8, 2009. Date of publication December 4, 2009;
date of current version August 11, 2010. This work was supported by the
SAFRAN Group.; This work made use of the Engineering Research Center
Shared Facilities supported by the National Science Foundation (NSF)
under NSF Award EEC-9731677 and the Industry Partnership Program.
NR 19
TC 23
Z9 23
U1 2
U2 4
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0278-0046
J9 IEEE T IND ELECTRON
JI IEEE Trans. Ind. Electron.
PD SEP
PY 2010
VL 57
IS 9
BP 3050
EP 3059
DI 10.1109/TIE.2009.2037643
PG 10
WC Automation & Control Systems; Engineering, Electrical & Electronic;
Instruments & Instrumentation
SC Automation & Control Systems; Engineering; Instruments & Instrumentation
GA 664OB
UT WOS:000282970300017
ER
PT J
AU Baisden, AC
Boroyevich, D
Wang, F
AF Baisden, Andrew Carson
Boroyevich, Dushan
Wang, Fei
TI Generalized Terminal Modeling of Electromagnetic Interference
SO IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
LA English
DT Article; Proceedings Paper
CT 43rd Annual Meeting of the IEEE-Industry-Applications-Society
CY OCT 05-09, 2008
CL Edmonton, CANADA
SP IEEE Ind Applicat Soc
DE Electromagnetic interference (EMI); equivalent circuit; Norton;
terminals
ID NOISE SOURCE IMPEDANCE; CONVERTER SYSTEMS; MOTOR DRIVE; IDENTIFICATION;
EMISSIONS
AB Terminal models have been used for various applications. In this paper, a three-terminal model is proposed for electromagnetic-interference (EMI) characterization. The model starts with a power electronic system at a particular operating condition and creates a unique linearized equivalent circuit. Impedances and current/voltage sources define the noise throughout the entire EMI frequency spectrum. All parameters needed to create the model are clearly defined to ensure convergence and maximize accuracy. In addition, the accuracy of the model is confirmed up to 100 MHz for a dc-dc boost converter using both simulation and experimental validation.
C1 [Baisden, Andrew Carson; Boroyevich, Dushan] Virginia Polytech Inst & State Univ, Ctr Power Elect Syst, Blacksburg, VA 24061 USA.
[Wang, Fei] Univ Tennessee, Knoxville, TN 37996 USA.
[Wang, Fei] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Baisden, AC (reprint author), Johns Hopkins Univ, Appl Phys Lab, Johns Hopkins Rd, Laurel, MD 20723 USA.
EM cbaisden@vt.edu; dushan@vt.edu; f.wang@ieee.org
NR 31
TC 15
Z9 15
U1 1
U2 6
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-9994
J9 IEEE T IND APPL
JI IEEE Trans. Ind. Appl.
PD SEP-OCT
PY 2010
VL 46
IS 5
BP 2068
EP 2079
DI 10.1109/TIA.2010.2058836
PG 12
WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic
SC Engineering
GA 684WC
UT WOS:000284584900045
ER
PT J
AU Wright, JC
Lee, J
Valeo, E
Bonoli, P
Phillips, CK
Jaeger, EF
Harvey, RW
AF Wright, John C.
Lee, Jungpyo
Valeo, Ernest
Bonoli, Paul
Phillips, Cynthia K.
Jaeger, E. F.
Harvey, Robert W.
TI Challenges in Self-Consistent Full-Wave Simulations of Lower Hybrid
Waves
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Simulation; vector wave equation; waves; X-ray measurements
ID ION-CYCLOTRON WAVES; TOKAMAK PLASMAS; PROPAGATION; DIFFUSION; FIELD
AB Analysis of wave propagation in the lower hybrid range of frequencies (LHRF) in the past was done using ray tracing and the Wentzel-Kramers-Brillouin approximation taking advantage of the very small scale of those waves. To include the effects of wave diffraction and focusing in this regime, full-wave simulation is necessary but requires significantly more computational power. In both ray tracing and full-wave simulations in the LHRF, it is also essential to include the self-consistent evolution of the electron distribution in response to the waves. This adds a considerable computational burden in constructing the stiffness matrix for the system [Valeo et al., "Full-wave Simulations of LH wave propagation in toroidal plasma with non-Maxwellian electron distributions," 18th Topical Conference on Radio Frequency Power in Plasmas, AIP Conference Proceedings (2007)]. Advances in algorithms and the availability of massively parallel computer architectures have permitted the solving of the Maxwell-Vlasov system for wave propagation directly [Wright et al., Phys. Plasmas (2009), 16, July]. We will discuss the various modeling advances that have led to this capability, including various memory-management approaches, physics-motivated algorithm adaptions appropriate to the LHRF, and improvements in the matrix solver to minimize communication overhead when using thousands of cores on leadership-class computer platforms. Of particular importance have been the use of verification and validation techniques and the analytic approximations to the imaginary (pole residue) contribution to the plasma dielectric response.
C1 [Wright, John C.; Lee, Jungpyo; Bonoli, Paul] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02169 USA.
[Valeo, Ernest; Phillips, Cynthia K.] Princeton Plasma Phys Lab, Plainsboro, NJ 08536 USA.
[Jaeger, E. F.] Xcel Engn, Oak Ridge, TN 37830 USA.
[Harvey, Robert W.] CompX, Del Mar, CA 92014 USA.
RP Wright, JC (reprint author), MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02169 USA.
EM jcwright@mit.edu; jungpyo@mit.edu; valeo@pppl.gov; bonoli@psfc.mit.edu;
ckphilli@pppl.gov; jaegeref@ornl.gov; bobh@compxco.com
FU U.S. Department of Energy [DE-FC02-01ER54648]; Office of Science, U.S.
Department of Energy, through the National Energy Research Scientific
Computing Center [DE-AC02-05CH11231]
FX This work was supported in part by the U.S. Department of Energy SciDAC
Program under Contract DE-FC02-01ER54648 and in part by the Office of
Science, U.S. Department of Energy, through the National Energy Research
Scientific Computing Center, under Contract DE-AC02-05CH11231.
NR 29
TC 12
Z9 12
U1 0
U2 12
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 SEP
PY 2010
VL 38
IS 9
BP 2136
EP 2143
DI 10.1109/TPS.2010.2055167
PN 1
PG 8
WC Physics, Fluids & Plasmas
SC Physics
GA 668EX
UT WOS:000283252500008
ER
PT J
AU Banks, JW
Hittinger, JAF
AF Banks, Jeffrey William
Hittinger, Jeffrey Alan Furst
TI A New Class of Nonlinear Finite-Volume Methods for Vlasov Simulation
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Finite-volume methods; plasma simulation; Vlasov equation
ID FLUX-CORRECTED TRANSPORT; PHASE-SPACE; EQUATION; SCHEME; INTEGRATION;
SOLVERS; GAS; PPM
AB Methods for the numerical discretization of the Vlasov equation should efficiently use the phase-space discretization and should introduce only enough numerical dissipation to promote stability and control oscillations. A new high-order nonlinear finite-volume algorithm for the Vlasov equation that discretely conserves particle number and controls oscillations is presented. The method is fourth order in space and time in well-resolved regions but smoothly reduces to a third-order upwind scheme as features become poorly resolved. The new scheme is applied to several standard problems for the Vlasov-Poisson system, and the results are compared with those from other finite-volume approaches, including an artificial viscosity scheme and the piecewise parabolic method. It is shown that the new scheme is able to control oscillations while preserving a higher degree of fidelity of the solution than the other approaches.
C1 [Banks, Jeffrey William; Hittinger, Jeffrey Alan Furst] Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA.
RP Banks, JW (reprint author), Lawrence Livermore Natl Lab, Ctr Appl Sci Comp, Livermore, CA 94551 USA.
EM banks20@llnl.gov; hittinger1@llnl.gov
RI Banks, Jeffrey/A-9718-2012
FU LLNL [08-ERD-031 (LLNL-JRNL-420843)]; U.S. Department of Energy by
Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
FX This work was supported by the Laboratory Directed Research and
Development Program at LLNL under Project Tracking Code 08-ERD-031
(LLNL-JRNL-420843).; The authors would like to thank Dr. B. Cohen for
his many helpful comments and suggestions. 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 30
TC 23
Z9 23
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
EI 1939-9375
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD SEP
PY 2010
VL 38
IS 9
BP 2198
EP 2207
DI 10.1109/TPS.2010.2056937
PN 1
PG 10
WC Physics, Fluids & Plasmas
SC Physics
GA 668EX
UT WOS:000283252500016
ER
PT J
AU Cohen, BI
Dimits, AM
Friedman, A
Caflisch, RE
AF Cohen, Bruce I.
Dimits, Andris M.
Friedman, Alex
Caflisch, Russel E.
TI Time-Step Considerations in Particle Simulation Algorithms for Coulomb
Collisions in Plasmas
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Algorithms; collision processes; computer applications; numerical
analysis; particle collisions; plasmas
ID MODEL
AB The accuracy of first-order Euler and higher-order time-integration algorithms for grid-based Langevin equations collision models in a specific relaxation test problem is assessed. We show that statistical noise errors can overshadow time-step errors and argue that statistical noise errors can be conflated with time-step effects. Using a higher-order integration scheme may not achieve any benefit in accuracy for examples of practical interest. We also investigate the collisional relaxation of an initial electron-ion relative drift and the collisional relaxation to a resistive steady-state in which a quasi-steady current is driven by a constant applied electric field, as functions of the time step used to resolve the collision processes using binary and grid-based, test-particle Langevin equations models. We compare results from two grid-based Langevin equations collision algorithms to results from a binary collision algorithm for modeling electron-ion collisions. Some guidance is provided on how large a time step can be used compared to the inverse of the characteristic collision frequency for specific relaxation processes.
C1 [Cohen, Bruce I.; Dimits, Andris M.; Friedman, Alex] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
[Caflisch, Russel E.] Univ Calif Los Angeles, Dept Math, Los Angeles, CA 90024 USA.
RP Cohen, BI (reprint author), Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
EM cohen1@llnl.gov; dimits1@llnl.gov; afriedman@lbl.gov;
caflisch@math.ucla.edu
FU U.S. Department of Energy at University of California at Los Angesles
[DE-AC52-07NA27344, DE-FG02-05ER-25710]
FX Manuscript received November 13, 2009; revised March 29, 2010; accepted
April 14, 2010. Date of publication June 1, 2010; date of current
version September 10, 2010. This work was performed under the auspices
of the U.S. Department of Energy by the Lawrence Livermore National
Laboratory under Contract DE-AC52-07NA27344 and under Grant
DE-FG02-05ER-25710 at University of California at Los Angesles under the
Multiscale Initiative program supported by the DOE Office of Scientific
Computing Research.
NR 21
TC 10
Z9 10
U1 0
U2 6
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 SEP
PY 2010
VL 38
IS 9
BP 2394
EP 2406
DI 10.1109/TPS.2010.2049589
PN 1
PG 13
WC Physics, Fluids & Plasmas
SC Physics
GA 668EX
UT WOS:000283252500042
ER
PT J
AU Li, FX
Qiao, W
Sun, HB
Wan, H
Wang, JH
Xia, Y
Xu, Z
Zhang, P
AF Li, Fangxing
Qiao, Wei
Sun, Hongbin
Wan, Hui
Wang, Jianhui
Xia, Yan
Xu, Zhao
Zhang, Pei
TI Smart Transmission Grid: Vision and Framework
SO IEEE TRANSACTIONS ON SMART GRID
LA English
DT Article
DE Smart control center; smart substation; smart transmission network;
smart transmission system
AB A modern power grid needs to become smarter in order to provide an affordable, reliable, and sustainable supply of electricity. For these reasons, considerable activity has been carried out in the United States and Europe to formulate and promote a vision for the development of future smart power grids. However, the majority of these activities emphasized only the distribution grid and demand side leaving the big picture of the transmission grid in the context of smart grids unclear. This paper presents a unique vision for the future of smart transmission grids in which their major features are identified. In this vision, each smart transmission grid is regarded as an integrated system that functionally consists of three interactive, smart components, i.e., smart control centers, smart transmission networks, and smart substations. The features and functions of each of the three functional components, as well as the enabling technologies to achieve these features and functions, are discussed in detail in the paper.
C1 [Li, Fangxing] Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN 37996 USA.
[Qiao, Wei] Univ Nebraska, Dept Elect Engn, Lincoln, NE 68588 USA.
[Sun, Hongbin] Tsinghua Univ, Dept Elect Engn, Beijing 100084, Peoples R China.
[Wan, Hui] W Virginia Univ, Dept Comp Sci & Elect Engn, Morgantown, WV 26506 USA.
[Wang, Jianhui] Argonne Natl Lab, Decis & Informat Sci Div, Argonne, IL 60439 USA.
[Xia, Yan] British Columbia Transmission Corp, Vancouver, BC V7X 1M8, Canada.
[Xu, Zhao] Hong Kong Polytech Univ, Dept Elect Engn, Hong Kong, Hong Kong, Peoples R China.
[Zhang, Pei] Elect Power Res Inst, Palo Alto, CA 94304 USA.
RP Li, FX (reprint author), Univ Tennessee, Dept Elect Engn & Comp Sci, Knoxville, TN 37996 USA.
EM fli6@utk.edu; wqiao@engr.unl.edu; shb@tsinghua.edu.cn;
hui.wan@mail.wvu.edu; jianhui.wang@anl.gov; yan.xia@bctc.com;
eezhaoxu@polyu.edu.hk; pzhang@epri.com
RI Wan, Hui/I-2553-2014; Li, Fangxing/E-6023-2013
OI Li, Fangxing/0000-0003-1060-7618
FU National Science Foundation (NSF) [CNS-0831466]
FX The work of F. Li was supported in part by the National Science
Foundation (NSF) under Grant CNS-0831466. Paper no. TSG-00007-2010.
NR 52
TC 263
Z9 282
U1 10
U2 60
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1949-3053
EI 1949-3061
J9 IEEE T SMART GRID
JI IEEE Trans. Smart Grid
PD SEP
PY 2010
VL 1
IS 2
BP 168
EP 177
DI 10.1109/TSG.2010.2053726
PG 10
WC Engineering, Electrical & Electronic
SC Engineering
GA V29ZV
UT WOS:000208787200006
ER
PT J
AU Wan, Y
Roy, S
Lesieutre, B
AF Wan, Yan
Roy, Sandip
Lesieutre, Bernard
TI Uncertainty Evaluation Through Mapping Identification in Intensive
Dynamic Simulations
SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART A-SYSTEMS AND
HUMANS
LA English
DT Article
DE Dynamical simulation; parameter identification; uncertainty analysis
ID AIR-TRAFFIC FLOW; MANAGEMENT; SYSTEMS; MODELS
AB We study how the dependence of a simulation output on an uncertain parameter can be determined when simulations are computationally expensive and so can only be run for very few parameter values. Specifically, the methodology that is developed-known as the probabilistic collocation method (PCM)-permits selection of these few parameter values, so that the mapping between the parameter and the output can be approximated well over the likely parameter values, using a low-order polynomial. Several new analyses are developed concerning the ability of PCM to predict the mapping structure, as well as output statistics. A holistic methodology is also developed for the typical case where the uncertain parameter's probability distribution is unknown, and instead, only depictive moments or sample data (which possibly depend on known regressors) are available. Finally, the application of PCM to weather-uncertainty evaluation in air traffic flow management is discussed.
C1 [Wan, Yan] Univ N Texas, Dept Elect Engn, Denton, TX 76207 USA.
[Roy, Sandip] Washington State Univ, Sch Elect Engn & Comp Sci, Pullman, WA 99164 USA.
[Lesieutre, Bernard] Univ Wisconsin Madison, Dept Elect & Comp Engn, Madison, WI 53706 USA.
[Lesieutre, Bernard] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
RP Wan, Y (reprint author), Univ N Texas, Dept Elect Engn, Denton, TX 76207 USA.
EM yan.wan@unt.edu; sroy@eecs.wsu.edu; lesieutre@engr.wisc.edu
FU National Aeronautics and Space Administration [NNA06CN26A]; National
Science Foundation [ECS-0528882, ECS-0725589]
FX Manuscript received May 14, 2008. Date of publication April 5, 2010;
date of current version August 18, 2010. This work was supported in part
by the National Aeronautics and Space Administration under Grant
NNA06CN26A and in part by the National Science Foundation under Grants
ECS-0528882 and ECS-0725589. This paper was recommended by Associate
Editor L. Gunderson.
NR 31
TC 7
Z9 8
U1 2
U2 5
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1083-4427
J9 IEEE T SYST MAN CY A
JI IEEE Trans. Syst. Man Cybern. Paart A-Syst. Hum.
PD SEP
PY 2010
VL 40
IS 5
SI SI
BP 1094
EP 1104
DI 10.1109/TSMCA.2010.2044172
PG 11
WC Computer Science, Cybernetics; Computer Science, Theory & Methods
SC Computer Science
GA 666OW
UT WOS:000283126300017
ER
PT J
AU Anderson, JC
Garth, C
Duchaineau, MA
Joy, KI
AF Anderson, John C.
Garth, Christoph
Duchaineau, Mark A.
Joy, Kenneth I.
TI Smooth, Volume-Accurate Material Interface Reconstruction
SO IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
LA English
DT Article
DE Material interface reconstruction; volume fractions; embedded boundary;
active interfaces; segmentation
ID ACTIVE CONTOUR MODELS; LEVEL SET; MOTION; ALGORITHMS; JUNCTIONS;
SURFACES; BALLOONS; TRACKING; FRONTS
AB A new material interface reconstruction method for volume fraction data is presented. Our method is comprised of two components: first, we generate initial interface topology; then, using a combination of smoothing and volumetric forces within an active interface model, we iteratively transform the initial material interfaces into high-quality surfaces that accurately approximate the problem's volume fractions. Unlike all previous work, our new method produces material interfaces that are smooth, continuous across cell boundaries, and segment cells into regions with proper volume. These properties are critical during visualization and analysis. Generating high-quality mesh representations of material interfaces is required for accurate calculations of interface statistics, and dramatically increases the utility of material boundary visualizations.
C1 [Anderson, John C.] Makai Ocean Engn Inc, Kailua, HI 96734 USA.
[Garth, Christoph; Joy, Kenneth I.] Univ Calif Davis, Inst Data Anal & Visualizat, Dept Comp Sci, Davis, CA 95616 USA.
[Duchaineau, Mark A.] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA.
RP Anderson, JC (reprint author), Makai Ocean Engn Inc, POB 1206, Kailua, HI 96734 USA.
EM John.Anderson@makai.com; cgarth@ucdavis.edu; duchaineau1@llnl.gov;
kijoy@ucdavis.edu
OI Garth, Christoph/0000-0003-1669-8549
FU US Department of Energy by Lawrence Livermore National Laboratory
[DE-AC52-07NA27344]; Lawrence Scholar Program; Office of Science, US
Department of Energy [Contract DE-AC02-05CH11231]
FX This work was performed under the auspices of the US Department of
Energy by Lawrence Livermore National Laboratory under Contract
DE-AC52-07NA27344, and supported by the Lawrence Scholar Program. This
work was also supported by the Office of Science, US Department of
Energy, under Contract DE-AC02-05CH11231 through the Scientific
Discovery through Advanced Computing (SciDAC) Program's Visualization
and Analytics Center for Enabling Technologies (VACET). The swirler data
set was graciously provided by Terry J. Ligocki and Phillip Colella at
Lawrence Berkeley National Laboratory;
http://eetd.lbl.gov/aet/combustion/LSC-info/. The bubble data set was
generated using the open-source fluid solver Gerris [46], available at:
http://gfs.sf.net. We have also used VisIt [12] (
http://www.llnl.gov/visit), a free interactive parallel visualization
and graphical analysis tool, to produce certain visualizations. The
authors would additionally like to thank Jeremey Meredith from Oak Ridge
National Laboratory, and colleagues in the Institute for Data Analysis
and Visualization ( IDAV) at UC Davis.
NR 46
TC 12
Z9 12
U1 0
U2 2
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA
SN 1077-2626
EI 1941-0506
J9 IEEE T VIS COMPUT GR
JI IEEE Trans. Vis. Comput. Graph.
PD SEP-OCT
PY 2010
VL 16
IS 5
BP 802
EP 814
DI 10.1109/TVCG.2010.17
PG 13
WC Computer Science, Software Engineering
SC Computer Science
GA 621ET
UT WOS:000279558200010
PM 20616395
ER
PT J
AU Huang, R
Biegler, LT
Patwardhan, SC
AF Huang, Rui
Biegler, Lorenz T.
Patwardhan, Sachin C.
TI Fast Offset-Free Nonlinear Model Predictive Control Based on Moving
Horizon Estimation
SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
LA English
DT Article
ID IMPLEMENTATION; OPTIMIZATION; ALGORITHM; SYSTEMS
AB To deal with plant model mismatches in control practice, this paper proposes two variations of an offset-free framework which integrates nonlinear model predictive control (NMPC) and moving horizon estimation (MHE). We prove that the proposed method achieves offset-free regulatory behavior, even in the presence of plant model mismatches. If the plant uncertainty structure is known, the MHE can be tuned to estimate uncertainty parameters, to remove the plant model mismatch online. In addition, we incorporate the advanced step NMPC (as-NMPC) and the advanced step MHE (as-MHE) strategies into the proposed method to reduce online computational delay. Finally, the proposed method is applied on a large scale air separation unit, and the steady state offset-free behavior is observed.
C1 [Huang, Rui; Biegler, Lorenz T.] Natl Energy Technol Lab, Morgantown, WV 26507 USA.
[Huang, Rui; Biegler, Lorenz T.] Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA.
[Patwardhan, Sachin C.] Indian Inst Technol, Dept Chem Engn, Bombay 400076, Maharashtra, India.
RP Biegler, LT (reprint author), Natl Energy Technol Lab, POB 880, Morgantown, WV 26507 USA.
EM biegler@cmu.edu
FU National Energy Technology Laboratory under the RDS [DE-AC26-04NT41817]
FX Partial support of this work was provided by the National Energy
Technology Laboratory's ongoing research in Process and Dynamic Systems
Research under the RDS Contract No. DE-AC26-04NT41817.
NR 18
TC 22
Z9 22
U1 0
U2 13
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0888-5885
J9 IND ENG CHEM RES
JI Ind. Eng. Chem. Res.
PD SEP 1
PY 2010
VL 49
IS 17
BP 7882
EP 7890
DI 10.1021/ie901945y
PG 9
WC Engineering, Chemical
SC Engineering
GA 641EO
UT WOS:000281107800018
ER
PT J
AU Wong, PC
Park, J
Hao, MC
AF Wong, Pak Chung
Park, Jinah
Hao, Ming C.
TI Special issue of selected papers from visualization and data analysis
2010
SO INFORMATION VISUALIZATION
LA English
DT Editorial Material
C1 [Wong, Pak Chung] Pacific NW Natl Lab, Richlan, WA 99352 USA.
[Park, Jinah] Korea Adv Inst Sci & Technol, Taejon 305701, South Korea.
[Hao, Ming C.] Hewlett Packard Corp, Intelligent Informat Management Lab, Palo Alto, CA 94304 USA.
RP Wong, PC (reprint author), Pacific NW Natl Lab, POB 999,K7-28, Richlan, WA 99352 USA.
EM pak.wong@pnl.gov; jinahpark@kaist.ac.kr; Ming.hao@hp.com
RI Park, Jinah/I-6949-2016
OI Park, Jinah/0000-0003-4676-9862
NR 0
TC 0
Z9 0
U1 0
U2 2
PU PALGRAVE MACMILLAN LTD
PI BASINGSTOKE
PA BRUNEL RD BLDG, HOUNDMILLS, BASINGSTOKE RG21 6XS, HANTS, ENGLAND
SN 1473-8716
J9 INFORM VISUAL
JI Inf. Vis.
PD FAL
PY 2010
VL 9
IS 3
SI SI
BP 165
EP 166
DI 10.1057/ivs.2010.7
PG 2
WC Computer Science, Software Engineering
SC Computer Science
GA 648YZ
UT WOS:000281732800001
ER
PT J
AU Erbacher, RF
Frincke, DA
Wong, PC
Moody, S
Fink, G
AF Erbacher, Robert F.
Frincke, Deborah A.
Wong, Pak Chung
Moody, Sarah
Fink, Glenn
TI A multi-phase network situational awareness cognitive task analysis
SO INFORMATION VISUALIZATION
LA English
DT Article
DE cognitive task analysis; cyber security visualization; security analyst
feedback; task-flow diagram
AB The goal of our project is to create a set of next-generation cyber situational-awareness capabilities with applications to other domains in the long term. The objective is to improve the decision-making process to enable decision makers to choose better actions. To this end, we put extensive effort into making certain that we had feedback from network analysts and managers and understand what their genuine needs are. This article discusses the cognitive task-analysis methodology that we followed to acquire feedback from the analysts. This article also provides the details we acquired from the analysts on their processes, goals, concerns, the data and metadata that they analyze. Finally, we describe the generation of a novel task-flow diagram representing the activities of the target user base. Information Visualization (2010) 9, 204-219. doi:10.1057/ivs.2010.5
C1 [Erbacher, Robert F.; Moody, Sarah] Utah State Univ, Dept Comp Sci, Logan, UT 84322 USA.
[Frincke, Deborah A.; Wong, Pak Chung; Fink, Glenn] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Erbacher, RF (reprint author), Utah State Univ, Dept Comp Sci, UMC 4205, Logan, UT 84322 USA.
EM Robert.Erbacher@usu.edu; Deborah.Frincke@pnl.gov; Pak.Wong@pnl.gov;
s.j.m@aggiemail.usu.edu; Glenn.Fink@pnl.gov
OI Fink, Glenn/0000-0001-5731-6514
FU AFRL [FA8750-07-C-0163]
FX This research was funded in part by AFRL under project FA8750-07-C-0163.
Many students played significant roles in the performance of the
project, including Anupama Biswas, Anusha Davuluri, Chris Harris,
Srinidhi Kakani, Stephen Miller, Steena Montiero, Sarah Moody, Rian
Shelley and RB Whitaker. We also appreciate the time and effort of the
participants from PNNL who provided input during the cognitive task
analysis. We also appreciate the valuable assistance and comments from
Sharon Eaton, Lorie Layne and Lee Ann Dudney, from Pacific Northwest
National Laboratory, in developing this article.
NR 18
TC 14
Z9 15
U1 1
U2 15
PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 1473-8716
J9 INFORM VISUAL
JI Inf. Vis.
PD FAL
PY 2010
VL 9
IS 3
SI SI
BP 204
EP 219
DI 10.1057/ivs.2010.5
PG 16
WC Computer Science, Software Engineering
SC Computer Science
GA 648YZ
UT WOS:000281732800005
ER
PT J
AU Abhishek, K
Leyffer, S
Linderoth, J
AF Abhishek, Kumar
Leyffer, Sven
Linderoth, Jeff
TI FilMINT: An Outer Approximation-Based Solver for Convex Mixed-Integer
Nonlinear Programs
SO INFORMS JOURNAL ON COMPUTING
LA English
DT Article
DE mixed-integer nonlinear programming; outer approximation; LP/NLP-based
branch and bound
ID CUTTING-PLANE METHOD; SEARCH ALGORITHM; MINLP PROBLEMS; OPTIMIZATION;
BRANCH; PERFORMANCE; SOFTWARE
AB We describe a new solver for convex mixed-integer nonlinear programs (MINLPs) that implements a linearization-based algorithm. The solver is based on an algorithm of Quesada and Grossmann [Quesada, I., I. E. Grossmann. 1992. An LP/NLP based branch-and-bound algorithm for convex MINLP optimization problems. Comput. Chemical Engrg. 16(10-11) 937-947] that avoids the complete re-solution of a master mixed-integer linear program (MILP) by adding new linearizations at open nodes of the branch-and-bound tree whenever an integer solution is found. The new solver, FilMINT, combines the MINTO branch-and-cut framework for MILP with filterSQP to solve the nonlinear programs that arise as subproblems in the algorithm. The MINTO framework allows us to easily employ cutting planes, primal heuristics, and other well-known MILP enhancements for MINLPs. We present detailed computational experiments that show the benefit of such advanced MILP techniques. We offer new suggestions for generating and managing linearizations that are shown to be efficient on a wide range of MINLPs. By carefully incorporating and tuning all these enhancements, an effective solver for convex MINLPs is constructed.
C1 [Abhishek, Kumar] United Airlines, Enterprise Optimizat, Elk Grove Village, IL 60007 USA.
[Leyffer, Sven] Argonne Natl Lab, Div Math & Comp Sci, Argonne, IL 60439 USA.
[Linderoth, Jeff] Univ Wisconsin, Dept Ind & Syst Engn, Madison, WI 53706 USA.
RP Abhishek, K (reprint author), United Airlines, Enterprise Optimizat, Elk Grove Village, IL 60007 USA.
EM kumar.abhishek@united.com; leyffer@mcs.anl.gov; linderoth@wisc.edu
RI Linderoth, Jeffrey/B-4995-2013
OI Linderoth, Jeffrey/0000-0003-4442-3059
FU Mathematical, Information, and Computational Sciences Division of the
Office of Advanced Scientific Computing Research, Office of Science,
U.S. Department of Energy [W-31-109-ENG-38]; National Science Foundation
(NSF) [CMMI-0522796, CCF-0830153]; U.S. Department of Energy
[DE-FG02-08ER25861, DE-FG02-09ER25869]; IBM
FX The second author is supported by the Mathematical, Information, and
Computational Sciences Division subprogram of the Office of Advanced
Scientific Computing Research, Office of Science, U.S. Department of
Energy, under Contract W-31-109-ENG-38. Support from the National
Science Foundation (NSF) under Grants CMMI-0522796 and CCF-0830153, by
the U.S. Department of Energy under Grants DE-FG02-08ER25861 and
DE-FG02-09ER25869, and by IBM, through the Faculty Partnership Program,
is gratefully acknowledged. The insightful commentary of two anonymous
referees contributed significantly to the final quality of the
publication. The authors thank Mustafa Kilinc for his continuing work on
FilMINT.
NR 37
TC 31
Z9 32
U1 0
U2 5
PU INFORMS
PI HANOVER
PA 7240 PARKWAY DR, STE 310, HANOVER, MD 21076-1344 USA
SN 1091-9856
J9 INFORMS J COMPUT
JI INFORMS J. Comput.
PD FAL
PY 2010
VL 22
IS 4
BP 555
EP 567
DI 10.1287/ijoc.1090.0373
PG 13
WC Computer Science, Interdisciplinary Applications; Operations Research &
Management Science
SC Computer Science; Operations Research & Management Science
GA 675PH
UT WOS:000283842100006
ER
PT J
AU Weber, JKR
AF Weber, J. K. Richard
TI The Containerless Synthesis of Glass
SO INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE
LA English
DT Article
ID HIGH-TEMPERATURE LIQUIDS; ELECTROSTATIC LEVITATOR; AERODYNAMIC
LEVITATION; SYNCHROTRON-RADIATION; VIBRATIONAL-SPECTRA; METALLIC-GLASS;
ALUMINA; DYNAMICS; EARTH; CRYSTALLIZATION
AB Glasses are commonly synthesized by cooling melts at a rate sufficient to prevent the nucleation of substantial amounts of crystalline phases. In the limit, high cooling rates no longer prevent crystallization. In some of these cases, elimination of container-melt-induced nucleation by using containerless processing (also called levitation) significantly extends the glass-forming composition range. Containerless methods also eliminate contamination allowing the preparation of high-purity materials that can be used to benchmark properties and structure. This article briefly reviews the application of containerless methods to several types of glass. Some examples of glasses formed using containerless techniques are presented and discussed in the context of developing materials. A short commentary on specific issues that relate to the use of containerless processing is presented. This review is intended to provide an introduction to the use of containerless methods in glass research.
C1 [Weber, J. K. Richard] Mat Dev Inc, Arlington Hts, IL 60004 USA.
[Weber, J. K. Richard] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA.
[Weber, J. K. Richard] Univ Tennessee, Dept Mat Sci & Engn Adjunct, Knoxville, TN 37996 USA.
RP Weber, JKR (reprint author), Mat Dev Inc, Arlington Hts, IL 60004 USA.
EM info@matsdev.com
NR 74
TC 8
Z9 8
U1 5
U2 29
PU WILEY PERIODICALS, INC
PI SAN FRANCISCO
PA ONE MONTGOMERY ST, SUITE 1200, SAN FRANCISCO, CA 94104 USA
SN 2041-1286
EI 2041-1294
J9 INT J APPL GLASS SCI
JI Int. J. Appl. Glass Sci.
PD SEP
PY 2010
VL 1
IS 3
SI SI
BP 248
EP 256
DI 10.1111/j.2041-1294.2010.00026.x
PG 9
WC Materials Science, Ceramics
SC Materials Science
GA V26BJ
UT WOS:000208520800005
ER
PT J
AU Vienna, JD
AF Vienna, John D.
TI Nuclear Waste Vitrification in the United States: Recent Developments
and Future Options
SO INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE
LA English
DT Article
AB Nuclear power plays a key role in maintaining current worldwide energy growth while minimizing the greenhouse gas emissions. A disposition path for used nuclear fuel (UNF) must be found for this technology to achieve its promise. One likely option is to recycle UNF and immobilize the high-level waste (HLW) by vitrification. Vitrification is the technology of choice for immobilizing HLW from defense and commercial fuel reprocessing around the world. Recent advances in both recycling technology and vitrification show great promise in closing the U.S. nuclear fuel cycle in an efficient fashion. This article summarizes the recent trends, developments, and future options in waste vitrification for both defense waste cleanup and closing the nuclear fuel cycle in the United States.
C1 [Vienna, John D.] Pacific NW Natl Lab, Richland, WA 99352 USA.
EM john.vienna@pnl.gov
NR 120
TC 35
Z9 36
U1 0
U2 25
PU WILEY PERIODICALS, INC
PI SAN FRANCISCO
PA ONE MONTGOMERY ST, SUITE 1200, SAN FRANCISCO, CA 94104 USA
SN 2041-1286
J9 INT J APPL GLASS SCI
JI Int. J. Appl. Glass Sci.
PD SEP
PY 2010
VL 1
IS 3
SI SI
BP 309
EP 321
DI 10.1111/j.20411294.2010.00023.x
PG 13
WC Materials Science, Ceramics
SC Materials Science
GA V26BJ
UT WOS:000208520800009
ER
PT J
AU Mathias, SA
Gluyas, JG
Oldenburg, CM
Tsang, CF
AF Mathias, Simon A.
Gluyas, Jon G.
Oldenburg, Curtis M.
Tsang, Chin-Fu
TI Analytical solution for Joule-Thomson cooling during CO2
geo-sequestration in depleted oil and gas reservoirs
SO INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
LA English
DT Article
DE Joule-Thomson cooling; Geologic carbon sequestration; Depleted gas
reservoirs
ID INJECTION
AB Mathematical tools are needed to screen out sites where Joule-Thomson cooling is a prohibitive factor for CO2 geo-sequestration and to design approaches to mitigate the effect. In this paper, a simple analytical solution is developed by invoicing steady-state flow and constant thermophysical properties. The analytical solution allows fast evaluation of spatiotemporal temperature fields, resulting from constant-rate CO2 injection. The applicability of the analytical solution is demonstrated by comparison with non-isothermal simulation results from the reservoir simulator TOUGH2. Analysis confirms that for an injection rate of 3 kg s(-1) (0.1 MT yr(-1)) into moderately warm (>40 degrees C) and permeable formations (>10(-14) m(2) (10 mD)), JTC is unlikely to be a problem for initial reservoir pressures as low as 2 MPa (290 psi). (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Mathias, Simon A.; Gluyas, Jon G.] Univ Durham, Dept Earth Sci, Durham, England.
[Oldenburg, Curtis M.; Tsang, Chin-Fu] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Earth Sci, Berkeley, CA 94720 USA.
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; Oldenburg, Curtis/L-6219-2013; Gluyas,
Jon/B-8808-2014
OI Mathias, Simon/0000-0003-3054-9056; Oldenburg,
Curtis/0000-0002-0132-6016; Gluyas, Jon/0000-0002-9386-7206
FU LBNL under US DOE [DE-AC02-05CH11231]
FX We thank internal LBNL reviewer, Andrea Cortis for his constructive
comments. Partial support for this work was provided by LBNL under US
DOE Contract No. DE-AC02-05CH11231.
NR 12
TC 24
Z9 26
U1 2
U2 19
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 1750-5836
J9 INT J GREENH GAS CON
JI Int. J. Greenh. Gas Control
PD SEP
PY 2010
VL 4
IS 5
BP 806
EP 810
DI 10.1016/j.ijggc.2010.05.008
PG 5
WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels; Engineering,
Environmental
SC Science & Technology - Other Topics; Energy & Fuels; Engineering
GA 644BK
UT WOS:000281345200011
ER
PT J
AU Person, M
Banerjee, A
Rupp, J
Medina, C
Lichtner, P
Gable, C
Pawar, R
Celia, M
McIntosh, J
Bense, V
AF Person, Mark
Banerjee, Amlan
Rupp, John
Medina, Cristian
Lichtner, Peter
Gable, Carl
Pawar, Rajesh
Celia, Michael
McIntosh, Jennifer
Bense, Victor
TI Assessment of basin-scale hydrologic impacts of CO2 sequestration,
Illinois basin
SO INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
LA English
DT Article
DE Mount Simon; Illinois basin; CO2; Earthquakes; Pressure; Brine transport
ID PETROLEUM MIGRATION; INDUCED SEISMICITY; SALINE AQUIFERS; UNITED-STATES;
MODELS; EARTHQUAKE; CHEMISTRY; RESERVOIR; RECHARGE; SYSTEMS
AB Idealized, basin-scale sharp-interface models of CO2 injection were constructed for the Illinois basin. Porosity and permeability were decreased with depth within the Mount Simon Formation. Eau Claire confining unit porosity and permeability were kept fixed. We used 726 injection wells located near 42 power plants to deliver 80 million metric tons of CO2/year. After 100 years of continuous injection, deviatoric fluid pressures varied between 5.6 and 18 MPa across central and southern part of the Illinois basin. Maximum deviatoric pressure reached about 50% of lithostatic levels to the south. The pressure disturbance (>0.03 MPa) propagated 10-25 km away from the injection wells resulting in significant well-well pressure interference. These findings are consistent with single-phase analytical solutions of injection. The radial footprint of the CO2 plume at each well was only 0.5-2 km after 100 years of injection. Net lateral brine displacement was insignificant due to increasing radial distance from injection well and leakage across the Eau Claire confining unit. On geologic time scales CO2 would migrate northward at a rate of about 6 m/1000 years. Because of paleo-seismic events in this region (M5.5-M7.5), care should be taken to avoid high pore pressures in the southern Illinois basin. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Person, Mark; Banerjee, Amlan] New Mexico Inst Min & Technol, Dept Earth & Environm Sci, Socorro, NM 87801 USA.
[Rupp, John; Medina, Cristian] Indiana Univ, Indiana Geol Survey, Bloomington, IN 47405 USA.
[Lichtner, Peter; Gable, Carl; Pawar, Rajesh] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
[Celia, Michael] Princeton Univ, Dept Civil Engn, Princeton, NJ 08544 USA.
[McIntosh, Jennifer] Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA.
[Bense, Victor] Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England.
RP Person, M (reprint author), New Mexico Inst Min & Technol, Dept Earth & Environm Sci, 801 Leroy Pl, Socorro, NM 87801 USA.
EM mperson@nmt.edu
RI Bense, Victor/C-9933-2011; Gable, Carl/B-4689-2011; Banerjee,
Amlan/P-9658-2016;
OI Banerjee, Amlan/0000-0002-2065-1391; Gable, Carl/0000-0001-7063-0815;
Bense, Victor/0000-0002-3675-5232
FU Department of Energy [DE-FE0001161]
FX This work was supported by a Department of Energy grant to Mark Person,
John Rupp, and Michael Celia under DE-FE0001161. We also wish to
acknowledge the comments of two anonymous reviewers and Dr. Chris Neuzil
of the US Geological Survey.
NR 79
TC 46
Z9 47
U1 0
U2 13
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 1750-5836
EI 1878-0148
J9 INT J GREENH GAS CON
JI Int. J. Greenh. Gas Control
PD SEP
PY 2010
VL 4
IS 5
BP 840
EP 854
DI 10.1016/j.ijggc.2010.04.004
PG 15
WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels; Engineering,
Environmental
SC Science & Technology - Other Topics; Energy & Fuels; Engineering
GA 644BK
UT WOS:000281345200015
ER
PT J
AU Luckow, P
Wise, MA
Dooley, JJ
Kim, SH
AF Luckow, P.
Wise, M. A.
Dooley, J. J.
Kim, S. H.
TI Large-scale utilization of biomass energy and carbon dioxide capture and
storage in the transport and electricity sectors under stringent CO2
concentration limit scenarios
SO INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
LA English
DT Article
DE Bioenergy; Carbon dioxide capture and storage; Climate change;
Greenhouse gas emissions mitigation; Electricity generation sector;
Transportation sector; Biomass energy production
ID MUNICIPAL SOLID-WASTE; CLIMATE-CHANGE; LAND-USE; EMISSIONS; COST; COAL;
TECHNOLOGIES; RECOVERY; SYSTEM; FUELS
AB Large-scale, dedicated commercial biomass energy systems are a potentially large contributor to meeting global climate policy targets by the end of the century. We use an integrated assessment model of energy and agriculture systems to show that, given a climate policy in which terrestrial carbon is appropriately valued equally with carbon emitted from the energy system, biomass energy has the potential to be a major component of achieving these low concentration targets. A key aspect of the research presented here is that the costs of processing and transporting biomass energy at much larger scales than current experience are explicitly incorporated into the modeling. From the scenario results, 120-160 EJ/year of biomass energy is produced globally by midcentury and 200-250 EJ/year by the end of this century. In the first half of the century, much of this biomass is from agricultural and forest residues, but after 2050 dedicated cellulosic biomass crops become the majority source, along with growing utilization of waste-to-energy. The ability to draw on a diverse set of biomass-based feedstocks helps to reduce the pressure for drastic large-scale changes in land use and the attendant environmental, ecological, and economic consequences those changes would unleash. In terms of the conversion of bioenergy feedstocks into value added energy, this paper demonstrates that biomass is and will continue to be used to generate electricity as well as liquid transportation fuels. A particular focus of this paper is to show how climate policies and technology assumptions - especially the availability of carbon dioxide capture and storage (CCS) technologies - affect the decisions made about where the biomass is used in the energy system. The potential for net-negative electric sector emissions through the use of CCS with biomass feedstocks provides an attractive part of the solution for meeting stringent emissions constraints: we find that at carbon prices above $150/tCO(2), over 90% of biomass in the energy system is used in combination with CCS. Despite the higher technology costs of CCS, it is a very important tool in controlling the cost of meeting a target, offsetting the venting of CO2 from sectors of the energy system that may be more expensive to mitigate, such as oil use in transportation. CCS is also used heavily with other fuels such as coal and natural gas, and by 2095 a total of 1530 GtCO(2) has been stored in deep geologic reservoirs. The paper also discusses the role of cellulosic ethanol and Fischer-Tropsch biomass derived transportation fuels as two representative conversion processes and shows that both technologies may be important contributors to liquid fuels production, with unique costs and emissions characteristics. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Luckow, P.; Wise, M. A.; Dooley, J. J.; Kim, S. H.] Pacific NW Natl Lab, Joint Global Change Res Inst, College Pk, MD 20740 USA.
RP Luckow, P (reprint author), Pacific NW Natl Lab, Joint Global Change Res Inst, 5825 Univ Res Court,Suite 3500, College Pk, MD 20740 USA.
EM patrick.luckow@pnl.gov
OI Dooley, James/0000-0002-2824-4344
NR 62
TC 57
Z9 57
U1 2
U2 33
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 1750-5836
J9 INT J GREENH GAS CON
JI Int. J. Greenh. Gas Control
PD SEP
PY 2010
VL 4
IS 5
BP 865
EP 877
DI 10.1016/j.ijggc.2010.06.002
PG 13
WC GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY; Energy & Fuels; Engineering,
Environmental
SC Science & Technology - Other Topics; Energy & Fuels; Engineering
GA 644BK
UT WOS:000281345200018
ER
PT J
AU Chen, RH
Phuoc, TX
Martello, D
AF Chen, Ruey-Hung
Phuoc, Tran X.
Martello, Donald
TI Effects of nanoparticles on nanofluid droplet evaporation
SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
LA English
DT Article
DE Nanofluids; Evaporation; Latent heat of vaporization; D(2)-law
ID THERMAL-CONDUCTIVITY ENHANCEMENT; HEAT-TRANSFER; WATER; MICROLAYER;
STABILITY
AB Laponite, Fe(2)O(3) and Ag nanoparticles were added to deionized water to study their effect of evaporation rates. The results show that these nanofluid droplets evaporate at different rates (as indicated by the evaporation rate constant K in the well known D(2)-law) from the base fluid. Different particles lead to different values of K. As the particle concentration increases due to evaporation. K values of various Ag and Fe(2)O(3) nanofluids go through a transition from one value to another, further demonstrating the effect of increasing nanoparticle concentration. The implication for the heat of vaporization (h(fg)) is discussed. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Chen, Ruey-Hung] Univ Cent Florida, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA.
[Phuoc, Tran X.; Martello, Donald] Natl Energy Technol Lab, Dept Energy, Pittsburgh, PA 15261 USA.
RP Chen, RH (reprint author), Univ Cent Florida, Dept Mech Mat & Aerosp Engn, 4000 Cent Florida Blvd, Orlando, FL 32816 USA.
EM chenrh@mail.ucf.edu
NR 30
TC 34
Z9 35
U1 7
U2 29
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0017-9310
J9 INT J HEAT MASS TRAN
JI Int. J. Heat Mass Transf.
PD SEP
PY 2010
VL 53
IS 19-20
BP 3677
EP 3682
DI 10.1016/j.ijheatmasstransfer.2010.04.006
PG 6
WC Thermodynamics; Engineering, Mechanical; Mechanics
SC Thermodynamics; Engineering; Mechanics
GA 633FF
UT WOS:000280484400008
ER
PT J
AU Marchi, CS
Michler, T
Nibur, KA
Somerday, BP
AF Marchi, C. San
Michler, T.
Nibur, K. A.
Somerday, B. P.
TI On the physical differences between tensile testing of type 304 and 316
austenitic stainless steels with internal hydrogen and in external
hydrogen
SO INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
LA English
DT Article
DE Austenitic stainless steel; Hydrogen environment; embrittlement;
Internal hydrogen embrittlement
ID DUCTILE FRACTURE TOPOGRAPHY; IRON-BASED SUPERALLOY; ENVIRONMENT
EMBRITTLEMENT; LOW-TEMPERATURES; CRACK-GROWTH; DEFORMATION; THRESHOLDS;
PRESSURE; GAS
AB Seventeen metastable austenitic stainless steels (type 304 and 316 alloys) were tested in tension both with internal hydrogen and in external hydrogen. Hydrogen-assisted fracture in both environments is a competition between hydrogen-affected ductile overload and hydrogen-assisted crack propagation. In general, hydrogen localizes the fracture process, which results in crack propagation of particularly susceptible materials at an apparent engineering stress that is less than the tensile strength of the material. Hydrogen-assisted crack propagation in this class of alloys becomes more prevalent at lower nickel content and lower temperature. In addition, for the tests in this study, external hydrogen reduces tensile ductility more than internal hydrogen. External hydrogen promotes crack initiation and propagation at the surface, while with internal hydrogen surface cracking is largely absent, thus preempting hydrogen-assisted crack propagation from the surface. This is not a general result, however, because the reduction of ductility with internal and external hydrogen depends on the specifics of the testing conditions that are compared (e.g., hydrogen gas pressure); in addition, internal hydrogen can promote the formation of internal cracks, which can propagate similar to surface cracks. (C) 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.
C1 [Marchi, C. San; Nibur, K. A.; Somerday, B. P.] Sandia Natl Labs, Livermore, CA USA.
[Michler, T.] Adam Opel GmbH, Russelsheim, Germany.
RP Marchi, CS (reprint author), Sandia Natl Labs, Livermore, CA USA.
EM cwsanma@sandia.gov
FU German Bundesministerium fur Wirtschaft und Technologie [0327802A]; U.S.
Department of Energy's National Nuclear Security Administration
[DE-AC04-94AL85000]
FX The authors would like to acknowledge Ken Lee and Roger Watson for their
assistance with testing at Sandia National Laboratories, and Jeff
Campbell for performing the hydrogen precharging, also at Sandia. Sandia
is a multiprogram laboratory operated by Sandia Corporation, a wholly
owned subsidiary of Lockheed Martin Corporation, for the U.S. Department
of Energy's National Nuclear Security Administration under contract
DE-AC04-94AL85000. This work was partly funded by the German
Bundesministerium fur Wirtschaft und Technologie under contract No.
0327802A.
NR 34
TC 50
Z9 50
U1 2
U2 15
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0360-3199
J9 INT J HYDROGEN ENERG
JI Int. J. Hydrog. Energy
PD SEP
PY 2010
VL 35
IS 18
SI SI
BP 9736
EP 9745
DI 10.1016/j.ijhydene.2010.06.018
PG 10
WC Chemistry, Physical; Electrochemistry; Energy & Fuels
SC Chemistry; Electrochemistry; Energy & Fuels
GA 656PA
UT WOS:000282347500026
ER
PT J
AU Ewing, RG
Waltman, MJ
AF Ewing, Robert G.
Waltman, Melanie J.
TI Production and utilization of CO3- produced by a corona discharge in air
for atmospheric pressure chemical ionization
SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
LA English
DT Article
DE APCI; IMS; CO3-; Corona discharge; Explosives
ID ION MOBILITY SPECTROMETRY; NEGATIVE-IONS
AB Atmospheric pressure chemical ionization is a multistep ionization process used in mass spectrometry and ion mobility spectrometry. The formation of product ions depends upon interactions with the analyte and the reactant ion species formed in the ionization source. The predominant reactant ion observed in a point-to-plane corona discharge in air occurs at m/z 60. There have been multiple references in the literature to the identity of this ion with some disagreement, It was postulated to be either CO3- or N2O2-. The identity of this ion is important as it is a key to the ionization of analytes. It was determined here to be CO3- through the use of 180 labeled oxygen. Further confirmation was provided through MS/MS studies The ionization of nitroglycerine (NC) with CO3- produced the adduct NC CO3- This was compared to ionization with NO3- and Cl- reactant ions that also formed adducts with NC. The fragmentation patterns of these three adducts provides insight into the charge distribution and indicates that CO3- has a relatively high electron affinity similar to that of nitrate. (C) 2010 Published by Elsevier B.V
C1 [Ewing, Robert G.; Waltman, Melanie J.] Pacific NW Natl Lab, Richland, WA 99354 USA.
[Waltman, Melanie J.] New Mexico Inst Min & Technol, Socorro, NM 87801 USA.
RP Ewing, RG (reprint author), Pacific NW Natl Lab, Richland, WA 99354 USA.
NR 17
TC 12
Z9 12
U1 0
U2 11
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1387-3806
J9 INT J MASS SPECTROM
JI Int. J. Mass Spectrom.
PD SEP-OCT
PY 2010
VL 296
IS 1-3
BP 53
EP 58
DI 10.1016/j.ijms.2010.08.024
PG 6
WC Physics, Atomic, Molecular & Chemical; Spectroscopy
SC Physics; Spectroscopy
GA 673YC
UT WOS:000283699100010
ER
PT J
AU Zhang, S
Chen, JH
Ma, YG
Tang, ZB
Xu, ZB
AF Zhang, Song
Chen, J. H.
Ma, Y. G.
Tang, Z. B.
Xu, Z. B.
TI HYPERNUCLEUS PRODUCTION AT RHIC AND HIRFL-CSR ENERGY
SO INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS
LA English
DT Article; Proceedings Paper
CT International Workshop on Nuclear Dynamics in Heavy-Ion Reactions and
the Symmetry Energy (IWND2009)
CY AUG 23-25, 2009
CL Shanghai, PEOPLES R CHINA
ID HEAVY-ION COLLISIONS; QUARK-GLUON PLASMA; NUCLEAR COLLISIONS; PION
SPECTRA; MODEL; PARTON; FLOW; COALESCENCE; COLLABORATION; STRANGENESS
AB We calculated the hypertriton production at RHIC-STAR and HIRFL-CSR acceptance, with a multi-phase transport model (AMPT) and a relativistic transport model (ART), respectively. In specific, we calculated the Strangeness Population Factor S-3 = H-3(Lambda)/(H-3(e) x Lambda/p) at different beam energy. Our results from AGS to RHIC energy indicated that the collision system may change from hadronic phase at AGS energies to partonic phase at RHIC energies. Our calculation at HIRFL-CSR energy supports the proposal to measure hypertriton at HIRFL-CSR.
C1 [Zhang, Song; Chen, J. H.; Ma, Y. G.] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
[Tang, Z. B.] Univ Sci & Technol China, Hefei 230026, Peoples R China.
[Xu, Z. B.] Brookhaven Natl Lab, Upton, NY 11973 USA.
RP Zhang, S (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
EM zhangsong@sinap.ac.cn; chenjh@sinap.ac.cn; ygma@sinap.ac.cn
RI Tang, Zebo/A-9939-2014; Ma, Yu-Gang/M-8122-2013
OI Tang, Zebo/0000-0002-4247-0081; Ma, Yu-Gang/0000-0002-0233-9900
NR 60
TC 0
Z9 0
U1 0
U2 3
PU WORLD SCIENTIFIC PUBL CO PTE LTD
PI SINGAPORE
PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE
SN 0218-3013
J9 INT J MOD PHYS E
JI Int. J. Mod. Phys. E-Nucl. Phys.
PD SEP
PY 2010
VL 19
IS 8-9
BP 1829
EP 1836
DI 10.1142/S0218301310016260
PG 8
WC Physics, Nuclear; Physics, Particles & Fields
SC Physics
GA 652PQ
UT WOS:000282021700037
ER
PT J
AU Nesterov, AI
Berman, GP
Bishop, AR
AF Nesterov, Alexander I.
Berman, Gennady P.
Bishop, Alan R.
TI NON-HERMITIAN DESCRIPTION OF A SUPERCONDUCTING PHASE QUBIT MEASUREMENT
SO INTERNATIONAL JOURNAL OF QUANTUM INFORMATION
LA English
DT Article
DE Superconducting phase qubit; Josephson junction
ID JOSEPHSON-JUNCTION; DIFFERENCE; CONTINUUM; STATE
AB We present an approach based on a non-Hermitian Hamiltonian to describe the process of measurement by tunneling of superconducting phase qubit states. We derive simple analytical expressions which describe the dynamics of measurement, and compare our results with those experimentally available. In particular, we show that even for a single qubit, the analytical expressions simplify the analysis of the dynamics in comparison with the density matrix approach. We also demonstrate that the effect of the interference of tunneling channels can be easily described by using the approach based on the non-Hermitian Hamiltonian.
C1 [Nesterov, Alexander I.] Univ Guadalajara, Dept Fis, CUCEI, Guadalajara 44420, Jalisco, Mexico.
[Berman, Gennady P.] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87544 USA.
[Bishop, Alan R.] Los Alamos Natl Lab, ADTSC, Los Alamos, NM 87544 USA.
RP Nesterov, AI (reprint author), Univ Guadalajara, Dept Fis, CUCEI, Av Revoluc 1500, Guadalajara 44420, Jalisco, Mexico.
EM nesterov@cencar.udg.mx; gpb@lanl.gov; arb@lanl.gov
OI Nesterov, Alexander/0000-0002-4801-4570
FU National Nuclear Security Administration of the US Department of Energy
at Los Alamos National Laboratory [DE-AC52-06NA25396]; Office of the
Director of National Intelligence (ODNI); Intelligence Advanced Research
Projects Activity (IARPA)
FX This work was carried out 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. This research
was funded by the Office of the Director of National Intelligence
(ODNI), Intelligence Advanced Research Projects Activity (IARPA).
NR 27
TC 2
Z9 2
U1 0
U2 2
PU WORLD SCIENTIFIC PUBL CO PTE LTD
PI SINGAPORE
PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE
SN 0219-7499
J9 INT J QUANTUM INF
JI Int. J. Quantum Inf.
PD SEP
PY 2010
VL 8
IS 6
BP 895
EP 904
DI 10.1142/S0219749910006630
PG 10
WC Computer Science, Theory & Methods; Physics, Particles & Fields;
Physics, Mathematical
SC Computer Science; Physics
GA 694PT
UT WOS:000285310800001
ER
PT J
AU Fransson, A
Tsang, CF
Rutqvist, J
Gustafson, G
AF Fransson, A.
Tsang, C. -F.
Rutqvist, J.
Gustafson, G.
TI Estimation of deformation and stiffness of fractures close to tunnels
using data from single-hole hydraulic testing and grouting
SO INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
LA English
DT Article
DE Hydromechanical coupling; Fractured rock; Fracture normalstiffness;
Stress; Hydraulic testing; Grouting
ID COUPLED HYDROMECHANICAL BEHAVIOR; HARD-ROCK; FIELD; PRESSURE
AB Sealing of tunnel sin fractured rocks is commonly performed by pre- or post-excavation grouting. The grouting boreholes are frequently drilled close to the tunnel wall, an area where rock stresses can be low and fractures can more easily open up during grout pressurization. In this paper we suggest that data from hydraulic testing and grouting can be used to identify grout-induced fracture opening, to estimate fracture stiffness of such fractures, and to evaluate its impact on the grout performance. A conceptual model and a method are presented for estimating fracture stiffness. The method is demonstrated using grouting data from four pre-excavation grouting boreholes at a shallow tunnel (50 m) in Nygard, Sweden, and two post-excavation grouting boreholes at a deep tunnel (450 m) in Aspo HRL, Sweden. The estimated stiffness of intersecting fractures for the boreholes at the shallow Nygard tunnel are low (2-5 GPa/m) and in agreement with literature data from field experiments at other fractured rock sites. Higher stifness was obtained for the deeper tunnel boreholes at Aspo which is reasonable considering that generally higher rock stresses are expected at greater depths. Our method of identifying and evaluating the properties and impact of deforming fractures might be most applicable when grouting takes place in boreholes adjacent to the tunnel wall, where local stresses might be low and where deforming (opening) fractures may take most of the grout. (C) 2010 Elsevier Ltd. All rights reserved.
C1 [Fransson, A.; Gustafson, G.] Chalmers, S-41296 Gothenburg, Sweden.
[Tsang, C. -F.; Rutqvist, J.] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Tsang, C. -F.] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England.
RP Fransson, A (reprint author), Chalmers, S-41296 Gothenburg, Sweden.
EM asa.fransson@chalmers.se
RI Rutqvist, Jonny/F-4957-2015
OI Rutqvist, Jonny/0000-0002-7949-9785
FU Swedish Research Council for Environment, Agricultural Sciences and
Spatial Planning (Formas); US Department of Energy [DE-AC02-05CH11231]
FX The first author thanks the Swedish Research Council for Environment,
Agricultural Sciences and Spatial Planning (Formas) for financial
support. Further, thanks go to PhD student christian Butron for the
collaborative work when analyzing flow dimensionality for the Nygard
tunnel. Funding for contributions from the Berkeley Lab authors was
provided by the US Department of Energy under Contract no.
DE-AC02-05CH11231.
NR 24
TC 9
Z9 10
U1 2
U2 24
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 SEP
PY 2010
VL 47
IS 6
BP 887
EP 893
DI 10.1016/j.ijrmms.2010.05.007
PG 7
WC Engineering, Geological; Mining & Mineral Processing
SC Engineering; Mining & Mineral Processing
GA 634UD
UT WOS:000280610200002
ER
PT J
AU Yang, SJ
Kataeva, I
Wiegel, J
Yin, YB
Dam, P
Xu, Y
Westpheling, J
Adams, MWW
AF Yang, Sung-Jae
Kataeva, Irina
Wiegel, Juergen
Yin, Yanbin
Dam, Phuongan
Xu, Ying
Westpheling, Janet
Adams, Michael W. W.
TI Classification of 'Anaerocellum thermophilum' strain DSM 6725 as
Caldicellulosiruptor bescii sp. nov.
SO INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY
LA English
DT Article
ID CELLULOLYTIC BACTERIUM; ANAEROBIC BACTERIUM; GEN-NOV; SACCHAROLYTICUS;
SPRINGS
AB The thermophilic, cellulolytic, anaerobic bacterium 'Anaerocellum thermophilum' strain Z-1320 was isolated from a hot spring almost two decades ago and deposited in the German Collection of Microorganisms and Cell Cultures (DSMZ) as DSM 6725. The organism was classified as representing a new genus, 'Anaerocellum', primarily on its growth physiology, cell-wall type and morphology. The results of recent physiological studies and of phylogenetic and genome sequence analyses of strain DSM 6725 of 'A. thermophilum' obtained from the DSMZ showed that its properties differed from those originally described for strain Z-1320. In particular, when compared with strain Z-1320, strain DSM 6725 grew at higher temperatures and had an expanded range of growth substrates. Moreover, the 16S rRNA gene sequence of strain DSM 6725 fell within the Caldicellulosiruptor clade. It is therefore suggested that 'Anaerocellum thermophilum' should be classified as a member of the genus Caldicellulosiruptor, for which the name Caldicellulosiruptor bescii sp. nov. is proposed (type strain DSM 6725(T)=ATCC BAA-1888(T)). C. bescii sp. nov. DSM 6725(T) is the most thermophilic cellulose-degrading organism known. The strain was able to grow up to 90 degrees C (pH 7.2) and degraded crystalline cellulose and xylan as well as untreated plant biomass, including potential bioenergy plants such as poplar and switchgrass.
C1 [Yang, Sung-Jae; Kataeva, Irina; Wiegel, Juergen; Yin, Yanbin; Dam, Phuongan; Xu, Ying; Adams, Michael W. W.] Univ Georgia, Dept Biochem & Mol Biol, Athens, GA 30602 USA.
[Westpheling, Janet] Univ Georgia, Dept Genet, Athens, GA 30602 USA.
[Wiegel, Juergen; Adams, Michael W. W.] Univ Georgia, Dept Microbiol, Athens, GA 30602 USA.
[Yin, Yanbin; Dam, Phuongan; Xu, Ying] Univ Georgia, Inst Bioinformat, Athens, GA 30602 USA.
[Yang, Sung-Jae; Kataeva, Irina; Yin, Yanbin; Dam, Phuongan; Xu, Ying; Westpheling, Janet; Adams, Michael W. W.] Oak Ridge Natl Lab, BioEnergy Sci Ctr, Biosci Div, Oak Ridge, TN 37831 USA.
RP Adams, MWW (reprint author), Univ Georgia, Dept Biochem & Mol Biol, Athens, GA 30602 USA.
EM adams@bmb.uga.edu
RI Yin, Yanbin/C-9788-2010;
OI Yin, Yanbin/0000-0001-7667-881X; Wiegel, Juergen/0000-0002-6343-6464
FU Office of Biological and Environmental Research in the DOE Office of
Science [DE-PS02-06ER64304]
FX This work was supported by grant (DE-PS02-06ER64304) from the Bioenergy
Science Center (BESC), Oak Ridge National Laboratory, a US Department of
Energy Bioenergy Research Center supported by the Office of Biological
and Environmental Research in the DOE Office of Science. We thank
Professor J. P. Euzeby with help in correctly naming the bacterium.
NR 13
TC 45
Z9 47
U1 1
U2 12
PU SOC GENERAL MICROBIOLOGY
PI READING
PA MARLBOROUGH HOUSE, BASINGSTOKE RD, SPENCERS WOODS, READING RG7 1AG,
BERKS, ENGLAND
SN 1466-5026
J9 INT J SYST EVOL MICR
JI Int. J. Syst. Evol. Microbiol.
PD SEP
PY 2010
VL 60
BP 2011
EP 2015
DI 10.1099/ijs.0.017731-0
PN 9
PG 5
WC Microbiology
SC Microbiology
GA 659CC
UT WOS:000282543600004
PM 19801388
ER
PT J
AU Laurie, M
Magallon, D
Rempe, J
Wilkins, C
Pierre, J
Marquie, C
Eymery, S
Morice, R
AF Laurie, M.
Magallon, D.
Rempe, J.
Wilkins, C.
Pierre, J.
Marquie, C.
Eymery, S.
Morice, R.
TI Ultrasonic High-Temperature Sensors: Past Experiments and Prospects for
Future Use
SO INTERNATIONAL JOURNAL OF THERMOPHYSICS
LA English
DT Article; Proceedings Paper
CT 1st TEMPMEKO and ISHM Joint International Symposium on Temperature,
Humidity, Moisture, and Thermal Measurements
CY MAY 31-JUN 04, 2010
CL Portoroz, SLOVENIA
SP ISHM, Int Measurement Confederat (IMEKO)
DE Fixed-point cells; Fuel testing; Harsh environment; High-temperature
irradiation; Severe accident experiment; Ultrasonic Thermometer
AB Ultrasonic thermometry sensors (UTS) have been intensively studied in the past to measure temperatures from 2080 K to 3380 K. This sensor, which uses the temperature dependence of the acoustic velocity in materials, was developed for experiments in extreme environments. Its major advantages, which are (a) capability of measuring a temperature profile from multiple sensors on a single probe and (b) measurement near the sensor material melting point, can be of great interest when dealing with on-line monitoring of high-temperature safety tests. Ultrasonic techniques were successfully applied in several severe accident related experiments. With new developments of alternative materials, this instrument may be used in a wide range of experimental areas where robustness and compactness are required. Long-term irradiation experiments of nuclear fuel to extremely high burn-ups could benefit from this previous experience. After an overview of UTS technology, this article summarizes experimental work performed to improve the reliability of these sensors. The various designs, advantages, and drawbacks are outlined and future prospects for long-term high-temperature irradiation experiments are discussed.
C1 [Laurie, M.; Magallon, D.] European Commiss, Joint Res Ctr, Inst Energy, Petten, Netherlands.
[Rempe, J.] Idaho Natl Lab, Idaho Falls, ID 83415 USA.
[Pierre, J.; Marquie, C.; Eymery, S.] Inst Radioprotect & Surete Nucl, Cadarache, France.
[Morice, R.] Lab Natl Metrol & Essais, F-75724 Paris, France.
RP Laurie, M (reprint author), European Commiss, Joint Res Ctr, Inst Energy, Petten, Netherlands.
EM mathias.laurie@ec.europa.eu
OI Rempe, Joy/0000-0001-5527-3549
NR 10
TC 7
Z9 8
U1 0
U2 10
PU SPRINGER/PLENUM PUBLISHERS
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0195-928X
J9 INT J THERMOPHYS
JI Int. J. Thermophys.
PD SEP
PY 2010
VL 31
IS 8-9
SI SI
BP 1417
EP 1427
DI 10.1007/s10765-010-0791-z
PG 11
WC Thermodynamics; Chemistry, Physical; Mechanics; Physics, Applied
SC Thermodynamics; Chemistry; Mechanics; Physics
GA 683OV
UT WOS:000284486000003
ER
PT J
AU Jansson, JK
Fredrickson, JK
AF Jansson, J. K.
Fredrickson, J. K.
TI Stewards of a changing planet: commentaries from ISME13 Plenary
Lecturers
SO ISME JOURNAL
LA English
DT Editorial Material
C1 [Jansson, J. K.] Lawrence Berkeley Natl Lab, Div Earth Sci, Dept Ecol, Berkeley, CA USA.
[Fredrickson, J. K.] Pacific NW Natl Lab, Div Biol Sci, Fundamental Sci Directorate, Richland, WA 99352 USA.
RP Jansson, JK (reprint author), Lawrence Berkeley Natl Lab, Div Earth Sci, Dept Ecol, Berkeley, CA USA.
EM jim.fredrickson@pnl.gov
RI Jansson, Janet/F-9951-2012
NR 0
TC 0
Z9 0
U1 0
U2 6
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 SEP
PY 2010
VL 4
IS 9
BP 1079
EP 1080
DI 10.1038/ismej.2010.114
PG 2
WC Ecology; Microbiology
SC Environmental Sciences & Ecology; Microbiology
GA 648AV
UT WOS:000281663700001
PM 20733576
ER
PT J
AU Remis, JP
Costerton, JW
Auer, M
AF Remis, Jonathan P.
Costerton, J. William
Auer, Manfred
TI Biofilms: structures that may facilitate cell-cell interactions
SO ISME JOURNAL
LA English
DT Editorial Material
ID MEMBRANE-VESICLES; MYXOCOCCUS-XANTHUS; TOMOGRAPHY; BIOLOGY; SIGNALS
C1 [Remis, Jonathan P.] Univ Calif Berkeley, Grad Grp Comparat Biochem, Berkeley, CA 94720 USA.
[Remis, Jonathan P.; Auer, Manfred] Lawrence Berkeley Labs, Div Life Sci, Berkeley, CA USA.
[Costerton, J. William] Allegheny Singer Res Inst, Ctr Genom Sci, Pittsburgh, PA 15212 USA.
RP Remis, JP (reprint author), Univ Calif Berkeley, Grad Grp Comparat Biochem, Berkeley, CA 94720 USA.
EM MAuer@lbl.gov
NR 10
TC 21
Z9 21
U1 2
U2 18
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 SEP
PY 2010
VL 4
IS 9
BP 1085
EP 1087
DI 10.1038/ismej.2010.105
PG 3
WC Ecology; Microbiology
SC Environmental Sciences & Ecology; Microbiology
GA 648AV
UT WOS:000281663700004
PM 20631806
ER
PT J
AU Reeve, JR
Schadt, CW
Carpenter-Boggs, L
Kang, S
Zhou, JZ
Reganold, JP
AF Reeve, Jennifer R.
Schadt, Christopher W.
Carpenter-Boggs, Lynne
Kang, Sanghoon
Zhou, Jizhong
Reganold, John P.
TI Effects of soil type and farm management on soil ecological functional
genes and microbial activities
SO ISME JOURNAL
LA English
DT Article
DE GeoChip microarray; soil functions; organic farming
ID ECOSYSTEM FUNCTION RELATIONSHIP; GRADIENT GEL-ELECTROPHORESIS;
METHYL-BROMIDE ALTERNATIVES; MICROARRAY-BASED ANALYSIS; CHLOROFORM
FUMIGATION; COMMUNITY STRUCTURE; ENZYME-ACTIVITIES; ORGANIC-MATTER;
BIODIVERSITY; DIVERSITY
AB Relationships between soil microbial diversity and soil function are the subject of much debate. Process-level analyses have shown that microbial function varies with soil type and responds to soil management. However, such measurements cannot determine the role of community structure and diversity in soil function. The goal of this study was to investigate the role of gene frequency and diversity, measured by microarray analysis, on soil processes. The study was conducted in an agro-ecosystem characterized by contrasting management practices and soil types. Eight pairs of adjacent commercial organic and conventional strawberry fields were matched for soil type, strawberry variety, and all other environmental conditions. Soil physical, chemical and biological analyses were conducted including functional gene microarrays (FGA). Soil physical and chemical characteristics were primarily determined by soil textural type (coarse vs fine-textured), but biological and FGA measures were more influenced by management (organic vs conventional). Organically managed soils consistently showed greater functional activity as well as FGA signal intensity (SI) and diversity. Overall FGA SI and diversity were correlated to total soil microbial biomass. Functional gene group SI and/or diversity were correlated to related soil chemical and biological measures such as microbial biomass, cellulose, dehydrogenase, ammonium and sulfur. Management was the dominant determinant of soil biology as measured by microbial gene frequency and diversity, which paralleled measured microbial processes. The ISME Journal (2010) 4, 1099-1107; doi: 10.1038/ismej.2010.42; published online 8 April 2010
C1 [Reeve, Jennifer R.] Utah State Univ, Dept Plants Soils & Climate, Logan, UT 84322 USA.
[Schadt, Christopher W.] Oak Ridge Natl Lab, Biosci & Environm Sci Div, Oak Ridge, TN USA.
[Carpenter-Boggs, Lynne] Washington State Univ, Ctr Sustaining Agr & Nat Resources, Pullman, WA 99164 USA.
[Kang, Sanghoon; Zhou, Jizhong] Univ Oklahoma, Inst Environm Genom, Norman, OK 73019 USA.
[Kang, Sanghoon; Zhou, Jizhong] Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA.
[Reganold, John P.] Washington State Univ, Dept Crop & Soil Sci, Pullman, WA 99164 USA.
RP Reeve, JR (reprint author), Utah State Univ, Dept Plants Soils & Climate, 4820 Old Main Hill, Logan, UT 84322 USA.
EM jennifer.reeve@usu.edu
RI Reeve, Jennifer /G-7148-2011; Schadt, Christopher/B-7143-2008;
OI Schadt, Christopher/0000-0001-8759-2448; Kang,
Sanghoon/0000-0002-3504-7955
FU Organic Center; United States Department of Energy
FX This work was funded by The Organic Center
(http://www.organic-center.org). Microarray analysis and the
participation of Dr's Schadt and Zhou was supported by The United States
Department of Energy under the Environmental Remediation Science
Program, and Genomics: GTL program through the Virtual Institute of
Microbial Stress and Survival (VIMSS; http://vimss.lbl.gov), Office of
Biological and Environmental Research, Office of Science, and by the
United States Department of Agriculture through NSF-USDA Microbial
Observatories Program. We thank Tom Sjulin of Driscoll's Strawberry
Associates and Larry Eddings of Pacific Gold Farms for assistance with
farm selection. A special thanks to Drs Jan Dasgupta and Stuart Higgins
for help and advice on statistical analysis. Additional thanks to Debbi
Bikfasy, Margaret Davies, Mary Fauci and Emily Hollister for training
and advice in lab protocols.
NR 46
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U1 8
U2 66
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 SEP
PY 2010
VL 4
IS 9
BP 1099
EP 1107
DI 10.1038/ismej.2010.42
PG 9
WC Ecology; Microbiology
SC Environmental Sciences & Ecology; Microbiology
GA 648AV
UT WOS:000281663700009
PM 20376100
ER
PT J
AU He, ZL
Deng, Y
Van Nostrand, JD
Tu, QC
Xu, MY
Hemme, CL
Li, XY
Wu, LY
Gentry, TJ
Yin, YF
Liebich, J
Hazen, TC
Zhou, JZ
AF He, Zhili
Deng, Ye
Van Nostrand, Joy D.
Tu, Qichao
Xu, Meiying
Hemme, Christopher L.
Li, Xingyuan
Wu, Liyou
Gentry, Terry J.
Yin, Yifeng
Liebich, Jost
Hazen, Terry C.
Zhou, Jizhong
TI GeoChip 3.0 as a high-throughput tool for analyzing microbial community
composition, structure and functional activity
SO ISME JOURNAL
LA English
DT Article
DE microarray; functional genes; microbial community; plant diversity
ID PSEUDOMONAS-PUTIDA STRAINS; MICROARRAY-BASED ANALYSIS; PROBE DESIGN
CRITERIA; OLIGONUCLEOTIDE MICROARRAY; GENE DIVERSITY; ELEVATED CO2;
PROKARYOTIC DIVERSITY; NITROGEN DEPOSITION; ENVIRONMENT; SEQUENCES
AB A new generation of functional gene arrays (FGAs; GeoChip 3.0) has been developed, with similar to 28 000 probes covering approximately 57 000 gene variants from 292 functional gene families involved in carbon, nitrogen, phosphorus and sulfur cycles, energy metabolism, antibiotic resistance, metal resistance and organic contaminant degradation. GeoChip 3.0 also has several other distinct features, such as a common oligo reference standard (CORS) for data normalization and comparison, a software package for data management and future updating and the gyrB gene for phylogenetic analysis. Computational evaluation of probe specificity indicated that all designed probes would have a high specificity to their corresponding targets. Experimental analysis with synthesized oligonucleotides and genomic DNAs showed that only 0.0036-0.025% false-positive rates were observed, suggesting that the designed probes are highly specific under the experimental conditions examined. In addition, GeoChip 3.0 was applied to analyze soil microbial communities in a multifactor grassland ecosystem in Minnesota, USA, which showed that the structure, composition and potential activity of soil microbial communities significantly changed with the plant species diversity. As expected, GeoChip 3.0 is a high-throughput powerful tool for studying microbial community functional structure, and linking microbial communities to ecosystem processes and functioning. The ISME Journal (2010) 4, 1167-1179; doi: 10.1038/ismej.2010.46; published online 29 April 2010
C1 [He, Zhili; Deng, Ye; Van Nostrand, Joy D.; Tu, Qichao; Xu, Meiying; Hemme, Christopher L.; Wu, Liyou; Zhou, Jizhong] Univ Oklahoma, Inst Environm Genom, Norman, OK 73019 USA.
[He, Zhili; Deng, Ye; Van Nostrand, Joy D.; Tu, Qichao; Xu, Meiying; Hemme, Christopher L.; Wu, Liyou; Zhou, Jizhong] Univ Oklahoma, Dept Bot & Microbiol, Norman, OK 73019 USA.
[Xu, Meiying] Guangdong Inst Microbiol, Guangdong Prov Key Lab Microbial Culture Collect, Guangzhou, Guangdong, Peoples R China.
[Li, Xingyuan] BioinformaticsPro, Newton, MA USA.
[Gentry, Terry J.] Texas A&M Univ, Dept Crop & Soil Sci, College Stn, TX USA.
[Yin, Yifeng] Trinity Biosyst Inc, Menlo Pk, CA USA.
[Liebich, Jost] Forschungszentrum Julich, Inst Chem & Dynam Geosphere Agrosphere 4, D-52425 Julich, Germany.
[Hazen, Terry C.; Zhou, Jizhong] Lawrence Berkeley Natl Lab, Div Earth Sci, Berkeley, CA USA.
RP Zhou, JZ (reprint author), Univ Oklahoma, Inst Environm Genom, 101 David L Boren Blvd, Norman, OK 73019 USA.
EM jzhou@ou.edu
RI Deng, Ye/A-2571-2013; He, Zhili/C-2879-2012; Van Nostrand,
Joy/F-1740-2016; Hazen, Terry/C-1076-2012;
OI Van Nostrand, Joy/0000-0001-9548-6450; Hazen, Terry/0000-0002-2536-9993;
?, ?/0000-0002-7584-0632
FU Virtual Institute of Microbial Stress and Survival (VIMSS)
[DE-AC02-05CH11231]; US Department of Energy; Lawrence Berkeley National
Laboratory; United States Department of Agriculture [2007-35319-18305];
Environmental Remediation Science Program; Oklahoma Bioengery Center
(OBC) of State of Oklahoma; Oklahoma Applied Research Support (OARS),
Oklahoma Center for the Advancement of Science and Technology (OCAST),
the State of Oklahoma
FX This work is supported by the Genomics: GTL program through the Virtual
Institute of Microbial Stress and Survival (VIMSS; http://vimss.lbl.gov)
as part of contract no. DE-AC02-05CH11231 between the US Department of
Energy and Lawrence Berkeley National Laboratory, the United States
Department of Agriculture (Project 2007-35319-18305) through NSF-USDA
Microbial Observatories Program, the Environmental Remediation Science
Program, the Oklahoma Bioengery Center (OBC) of State of Oklahoma, and
the Oklahoma Applied Research Support (OARS), Oklahoma Center for the
Advancement of Science and Technology (OCAST), the State of Oklahoma.
NR 59
TC 169
Z9 185
U1 17
U2 137
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 SEP
PY 2010
VL 4
IS 9
BP 1167
EP 1179
DI 10.1038/ismej.2010.46
PG 13
WC Ecology; Microbiology
SC Environmental Sciences & Ecology; Microbiology
GA 648AV
UT WOS:000281663700015
PM 20428223
ER
PT J
AU Yang, ZG
AF Yang, Zheyriguo (Gary)
TI Status and Challenges in Electrochemical Energy Storage Technologies for
Stationary Applications
SO JOM
LA English
DT Editorial Material
C1 [Yang, Zheyriguo (Gary)] Pacific NW Natl Lab, Elect Magnet & Photon Mat Div, Energy Convers & Storage Comm, Richland, WA 99354 USA.
[Yang, Zheyriguo (Gary)] TMS, Elect Magnet & Photon Mat Div, Energy Convers & Storage Comm, JOM, Richland, WA 99354 USA.
RP Yang, ZG (reprint author), Pacific NW Natl Lab, Elect Magnet & Photon Mat Div, Energy Convers & Storage Comm, 902 Battelle Blvd, Richland, WA 99354 USA.
EM Zgary.yang@pnl.gov
NR 0
TC 0
Z9 0
U1 0
U2 2
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD SEP
PY 2010
VL 62
IS 9
BP 13
EP 13
PG 1
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 647GD
UT WOS:000281605200003
ER
PT J
AU Yang, ZG
Liu, J
Baskaran, S
Imhoff, CH
Holladay, JD
AF Yang, Zhenguo
Liu, Jun
Baskaran, Suresh
Imhoff, Carl H.
Holladay, Jamie D.
TI Enabling Renewable Energy-and the Future Grid-with Advanced Electricity
Storage
SO JOM
LA English
DT Article
ID LITHIUM-ION BATTERIES; REDOX FLOW BATTERY; INSERTION MATERIAL; MATERIALS
CHALLENGES; NAFION MEMBRANE; CELL; CARBON; CONVERSION; ELECTRODE;
LIFEPO4
C1 [Yang, Zhenguo; Liu, Jun; Baskaran, Suresh; Imhoff, Carl H.; Holladay, Jamie D.] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Yang, ZG (reprint author), Pacific NW Natl Lab, 902 Battelle Blvd, Richland, WA 99352 USA.
EM zgary.yang@pnl.gov
FU U.S. Department of Energy's ARPA-E, Office of Electricity Delivery and
Reliability, and Energy Efficiency & Renewable Energy (EERE)
[DE-AC05-76RL01830]; Pacific Northwest National Laboratory (PNNL); U.S.
Department of Energy [DE-AC05-76RL01830]
FX The authors acknowledge financial support from the U.S. Department of
Energy's ARPA-E, Office of Electricity Delivery and Reliability, and
Energy Efficiency & Renewable Energy (EERE), along with support by the
Laboratory-Directed Research and Development Program of the Pacific
Northwest National Laboratory (PNNL). PNNL is a multi-program national
laboratory operated by Battelle Memorial Institute for the U.S.
Department of Energy under Contract DE-AC05-76RL01830.
NR 63
TC 30
Z9 30
U1 3
U2 21
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
EI 1543-1851
J9 JOM-US
JI JOM
PD SEP
PY 2010
VL 62
IS 9
BP 14
EP 23
PG 10
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 647GD
UT WOS:000281605200004
ER
PT J
AU Xu, T
Wang, W
Gordin, ML
Wang, DH
Choi, DW
AF Xu, Terrence
Wang, Wei
Gordin, Mikhail L.
Wang, Donghai
Choi, Daiwon
TI Lithium-ion Batteries for Stationary Energy Storage
SO JOM
LA English
DT Article
ID ANATASE TIO2 NANOTUBES; LIFEPO4; INTERCALATION; INSERTION; SPINEL;
OXIDES; ANODE; NANOSTRUCTURES; PERFORMANCE; REACTIVITY
AB The use of Li-ion batteries for stationary energy storage systems to complement the renewable energy sources such as solar and wind power has recently attracted great interest. Currently available Li-ion battery electrode materials suitable for such stationary applications have been discussed, along with optimum cathode and anode combinations, limitations, and future research directions.
C1 [Xu, Terrence; Gordin, Mikhail L.; Wang, Donghai] Penn State Univ, Dept Mech & Nucl Engn, State Coll, PA USA.
[Wang, Wei; Choi, Daiwon] Pacific NW Natl Lab, Richland, WA 99354 USA.
RP Xu, T (reprint author), Penn State Univ, Dept Mech & Nucl Engn, State Coll, PA USA.
EM dwang@psu.edu; daiwon.choi@pnl.gov
RI Wang, Wei/F-4196-2010; Choi, Daiwon/B-6593-2008; Wang,
Donghai/L-1150-2013; Xu, Terrence/M-8741-2014
OI Wang, Wei/0000-0002-5453-4695; Wang, Donghai/0000-0001-7261-8510; Xu,
Terrence/0000-0002-9385-6881
FU Office of Electricity Delivery, & Energy Reliability (OE), Energy
Efficiency & Renewable Energy (EERE) of U.S. Department of Energy (DOE)
[57558, 59808]; Pacific Northwest National Laboratory (PNNL); DOE
[DE-AC05-76RL0183]; Penn State New Faculty
FX The authors would like to acknowledge financial support by the Office of
Electricity Delivery, & Energy Reliability (OE), Energy Efficiency &
Renewable Energy (EERE) of U.S. Department of Energy (DOE) (under
contracts #57558 and #59808, respectively), as well as by
Laboratory-Directed Research and Development Program of the Pacific
Northwest National Laboratory (PNNL). PNNL is a multi-program national
laboratory operated by Battelle Memorial Institute for the DOE under
Contract DE-AC05-76RL0183. D. W. acknowledges support from the Penn
State New Faculty Startup Fund.
NR 34
TC 25
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U1 2
U2 21
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD SEP
PY 2010
VL 62
IS 9
BP 24
EP 30
PG 7
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 647GD
UT WOS:000281605200005
ER
PT J
AU Lu, XC
Lemmon, JP
Sprenkle, V
Yang, ZG
AF Lu, Xiaochuan
Lemmon, John P.
Sprenkle, Vincent
Yang, Zhenguo
TI Sodium-beta Alumina Batteries: Status and Challenges
SO JOM
LA English
DT Article
ID LITHIA-STABILIZED BETA''-ALUMINA; SINGLE-CRYSTAL; BETA''-AL2O3/ZRO2
COMPOSITES; ELECTRICAL-PROPERTIES; IONIC-CONDUCTIVITY; RESISTANCE RISE;
SULFUR CELLS; GRAIN-SIZE; POLYCRYSTALLINE; MICROSTRUCTURE
AB This paper provides a review of materials and designs for sodium-beta alumina battery technology and discusses the challenges ahead for further technology improvement. Sodium-beta alumina batteries have been extensively developed in recent years and encouraging progress in performance and cycle life has been achieved. The battery is composed of an anode, typically molten sodium, and a cathode that can be molten sulfur (Na-S battery) or a transition metal halide incorporated with a liquid phase secondary electrolyte (e.g.. ZEBRA battery). In most cases the electrolyte is a dense solid beta ''-Al(2)O(3), sodium ion-conducting membrane. The issues' prohibiting widespread commercialization of sodium-beta alumina technology are rekited to the materials and methods of manufacturing that impact cost, safety, and performance characteristics.
C1 [Lu, Xiaochuan; Lemmon, John P.; Sprenkle, Vincent; Yang, Zhenguo] Pacific NW Natl Lab, Richland, WA 99352 USA.
RP Lu, XC (reprint author), Pacific NW Natl Lab, Richland, WA 99352 USA.
EM John.Lemmon@pnl.gov
FU Pacific Northwest National Laboratory (PNNL); U.S. Department of Energy
[DE-AC05-76RL0183]; ARPA-E of the U.S. Department of Energy
FX The authors would like to acknowledge financial support by ARPA-E of the
U.S. Department of Energy and by the Laboratory-Directed Research and
Development Program of the Pacific Northwest National Laboratory (PNNL).
PNNL is a multi-program national laboratory operated by Battelle
Memorial Institute for the U.S. Department of Energy under Contract
DE-AC05-76RL0183.
NR 67
TC 20
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U1 8
U2 95
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD SEP
PY 2010
VL 62
IS 9
BP 31
EP 36
PG 6
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 647GD
UT WOS:000281605200006
ER
PT J
AU Petti, D
Maki, J
Hunn, J
Pappano, P
Barnes, C
Saurwein, J
Nagley, S
Kendall, J
Hobbins, R
AF Petti, David
Maki, John
Hunn, John
Pappano, Pete
Barnes, Charles
Saurwein, John
Nagley, Scott
Kendall, Jim
Hobbins, Richard
TI The DOE Advanced Gas Reactor Fuel Development and Qualification Program
SO JOM
LA English
DT Article
AB The high outlet temperatures and high thermal-energy conversion efficiency of modular high-temperature gas-cooled reactors (HTGRs) enable an efficient and cost-effective integration of the reactor system with nonelectricity-generation applications, such as process heat and/or hydrogen production, for the many petrochemical and other industrial processes' that require temperatures between 300 C and 900 C. The U.S. Department of Energy (DOE) has selected the HTGR concept for the Next Generation Nuclear Plant (NGNP) Project as a transformative application of nuclear energy that will demonstrate emissions-free nuclear-assisted electricity, process heat, and hydrogen production, thereby reducing greenhouse-gas emissions and enhancing energy security. The objective of the DOE Advanced Gas Reactor (AGR) Fuel Development and Qualification program is to qualify tristrucrural isotropic (TRISO)-coated particle fuel for use in HTGRs. An overview of the program and recent progress is presented.
C1 [Petti, David; Maki, John; Barnes, Charles] INL, Idaho Falls, ID 83415 USA.
[Saurwein, John] Gen Atom Co, San Diego, CA USA.
[Nagley, Scott] Babcock & Wilcox Nucl Operat Grp, Lynchburg, VA USA.
[Kendall, Jim] Global Virtual LLC, Prescott, AZ USA.
[Hobbins, Richard] RRH Consulting, Wilson, WY USA.
RP Petti, D (reprint author), INL, POB 1625, Idaho Falls, ID 83415 USA.
EM david.petti@inl.gov
NR 5
TC 21
Z9 21
U1 0
U2 7
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD SEP
PY 2010
VL 62
IS 9
BP 62
EP 66
PG 5
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 647GD
UT WOS:000281605200014
ER
PT J
AU Odette, GR
Hoelzer, DT
AF Odette, G. R.
Hoelzer, D. T.
TI Irradiation-tolerant Nanostructured Ferritic Alloys: Transforming Helium
from a Liability to an Asset
SO JOM
LA English
DT Article
ID MICROSTRUCTURAL EVOLUTION; MECHANICAL-PROPERTIES; ODS-EUROFER; STEELS;
STRENGTH; METALS; 14YWT
AB Nanostructured ferritic alloys (ATMs) have the potential to make transformational contributions to developing advanced sources of fission and fusion energy. NFAs are Fe-Cr based ferritic stainless steels that contain an ultrahigh density of Y-Ti-O nanofeatures (NFs). The NFs provide both outstanding high temperature properties and remarkable tolerance to irradiation induced displacement damage as well as the degrading effects of transmutation product helium. Indeed, NFs can transform helium from a liability to an asset by forming a high density of nm-scale bubbles that act as sinks for point defects and helium may provide near immunity to radiation damage. This article outlines recent progress on engaging the challenges facing NFA development.
C1 [Odette, G. R.] Univ Calif Santa Barbara, Dept Mech Engn, Santa Barbara, CA 93106 USA.
[Hoelzer, D. T.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
RP Odette, GR (reprint author), Univ Calif Santa Barbara, Dept Mech Engn, Santa Barbara, CA 93106 USA.
EM odette@engineering.ucsb.edu
RI Hoelzer, David/L-1558-2016
FU Department of Energy Office of Fusion Energy Sciences; Office of Nuclear
Energy
FX The University of California Santa Barbara (UCSB) and Oak Ridge National
Laboratory (ORNL) research described in this article was supported by
the Department of Energy Office of Fusion Energy Sciences and the Office
of Nuclear Energy. Support at ORNL was also provided by the Laboratory
Directed Research and Development Program. The excellent facilities for
the transmission electron microscopy studies carried out at UCSBs
National Science Foundation MRSEC Microstructure and Microanalysis
Facility and the SANS' measurements conducted by UCSB researchers at the
NIST acknowledged. Both authors thank our UCSB and ORNL colleagues as
well as our national and international collaborators and colleagues for
their many contributions to the development of high performance,
irradiation tolerant alloys.
NR 33
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PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD SEP
PY 2010
VL 62
IS 9
BP 84
EP 92
PG 9
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 647GD
UT WOS:000281605200017
ER
PT J
AU Burchell, TD
Murty, KL
Eapen, J
AF Burchell, T. D.
Murty, K. L.
Eapen, J.
TI Irradiation Induced Creep of Graphite
SO JOM
LA English
DT Article
ID FAST-NEUTRON IRRADIATION; REACTOR GRAPHITE; DIMENSIONAL CHANGES; MODEL
AB The status of graphite irradiation induced creep strain prediction is reviewed and major creep models are described. The ability of the models to quantitatively predict the irradiation induced creep strain of graphite is reported. Potential mechanisms of in-crystal creep are reviewed as are mechanisms of pore generation under stress. The case for further experimental work is made and the need for improved creep models across multiscales is highlighted.
C1 [Burchell, T. D.] Oak Ridge Natl Lab, Mat Sci & Engn Div, Oak Ridge, TN 37831 USA.
[Murty, K. L.; Eapen, J.] N Carolina State Univ, Dept Nucl Engn, Raleigh, NC 27695 USA.
RP Burchell, TD (reprint author), Oak Ridge Natl Lab, Mat Sci & Engn Div, Oak Ridge, TN 37831 USA.
EM burchelltd@ornl.gov; murty@ncsu.edu; jacob.eapen@ncsu.edu
RI Eapen, Jacob/A-2777-2011; Burchell, Tim/E-6566-2017
OI Eapen, Jacob/0000-0001-6796-4013; Burchell, Tim/0000-0003-1436-1192
FU U.S. Department of Energy, Office of Nuclear Energy Science and
Technology with Oak Ridge National Laboratory [DE-AC05-00OR22725];
DOE/NEUP [00042959 00024]
FX This work is sponsored by the U.S. Department of Energy, Office of
Nuclear Energy Science and Technology under contract DE-AC05-00OR22725
with Oak Ridge National Laboratory managed by UT-Battelle, LLC. Drs.
Eapen and Murty acknowledge informative discussions with Dr. Louis
Mansur and financial support from DOE/NEUP contract #00042959 00024.
NR 34
TC 4
Z9 4
U1 0
U2 14
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1047-4838
J9 JOM-US
JI JOM
PD SEP
PY 2010
VL 62
IS 9
BP 93
EP 99
PG 7
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering; Mineralogy; Mining & Mineral Processing
SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy;
Mining & Mineral Processing
GA 647GD
UT WOS:000281605200018
ER
PT J
AU Cheng, RH
Carvell, J
Fradin, FY
AF Cheng, Ruihua
Carvell, Jeffery
Fradin, F. Y.
TI Room temperature electron transport properties of single C-60 studied
using scanning tunneling microscope and break junctions
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID TRANSISTOR
AB We report the measurements of the electron transport of an individual C-60 molecule through the combination of two experimental efforts. The nanometer-sized junctions were fabricated using electromigration combined with electron beam lithography and shadow effect evaporation. We performed the scanning tunneling microscopy/spectroscopy measurements of dispersed C-60 molecules which were deposited on a highly ordered pyrolytic graphite substrate. The single electron tunneling through a single C-60 molecule due to the Coulomb blockage effect is observed at room temperature. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3481027]
C1 [Cheng, Ruihua; Carvell, Jeffery] Indiana Univ Purdue Univ, Dept Phys, Indianapolis, IN 46202 USA.
[Fradin, F. Y.] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA.
[Fradin, F. Y.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
RP Cheng, RH (reprint author), Indiana Univ Purdue Univ, Dept Phys, 402 N Blackford St, Indianapolis, IN 46202 USA.
EM rucheng@iupui.edu
NR 19
TC 0
Z9 0
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 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD SEP 1
PY 2010
VL 108
IS 5
AR 053720
DI 10.1063/1.3481027
PG 4
WC Physics, Applied
SC Physics
GA 658GQ
UT WOS:000282478900053
ER
PT J
AU Du, MH
AF Du, Mao-Hua
TI First-principles study of native defects in TlBr: Carrier trapping,
compensation, and polarization phemomenon
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID THALLOUS HALIDES; DETECTOR; PERFORMANCE; CRYSTALS; BROMIDE; TLCL
AB First-principles calculations are carried out to study the native defect properties in TlBr. Three important results emerge: (1) the native defects are benign in terms of electron trapping because the low-energy defects do not induce electron traps; (2) the dominant defects in nearly stoichiometric TlBr are Schottky defects that pin the Fermi level near the midgap, leading to high resistivity; and (3) the calculated low diffusion barriers for several native defects show that ionic conductivity can occur at room temperature. The important impacts of these material properties on the room-temperature radiation detection using TlBr are discussed. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3476564]
C1 [Du, Mao-Hua] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Du, Mao-Hua] Oak Ridge Natl Lab, Ctr Radiat Detect Mat & Syst, Oak Ridge, TN 37831 USA.
RP Du, MH (reprint author), Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
EM mhdu@ornl.gov
RI Du, Mao-Hua/B-2108-2010
OI Du, Mao-Hua/0000-0001-8796-167X
FU U.S. DOE Office of Nonproliferation Research and Development [NA22]
FX The author is grateful for the useful discussion with D. J. Singh. This
work was supported by the U.S. DOE Office of Nonproliferation Research
and Development NA22.
NR 23
TC 30
Z9 30
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 SEP 1
PY 2010
VL 108
IS 5
AR 053506
DI 10.1063/1.3476564
PG 4
WC Physics, Applied
SC Physics
GA 658GQ
UT WOS:000282478900019
ER
PT J
AU Fu, H
Zou, M
Mudryk, Y
Pecharsky, VK
Gschneidner, KA
AF Fu, H.
Zou, M.
Mudryk, Ya.
Pecharsky, V. K.
Gschneidner, K. A., Jr.
TI Enhancement of the glass-forming ability by Zr microalloying and its
influence on the magnetocaloric properties of bulk amorphous Gd-Co-Al
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID METALLIC GLASSES; ADDITIONS; ALLOYS; TB; HO; DY
AB Microalloying with 1 at. % zirconium dramatically increases the critical size from 3 to 8 mm for Gd-based bulk metallic glasses (BMGs). The enhancement of glass-forming ability originates from the increase in the packing efficiency and high compound forming tendency between Zr and major constituent elements. The maximum magnetic entropy change (-Delta S(Mmax)) and relative cooling power (RCP) of Gd(52.5)Co(18.5)Al(29-x)Zr(x) (x=1) BMG are 9.6 J/kg K and 8.9 x 10(2) J/kg, respectively. Heat capacity data demonstrate that the broad magnetic transition arising from topological disorder is responsible for the high RCP of Gd-based amorphous magnetocaloric materials. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3481923]
C1 [Fu, H.] Univ Elect Sci & Technol China, Dept Appl Phys, Chengdu 610054, Peoples R China.
[Fu, H.; Zou, M.; Mudryk, Ya.; Pecharsky, V. K.; Gschneidner, K. A., Jr.] Iowa State Univ Sci & Technol, Ames Lab, US DOE, Ames, IA 50011 USA.
[Pecharsky, V. K.; Gschneidner, K. A., Jr.] Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA.
RP Fu, H (reprint author), Univ Elect Sci & Technol China, Dept Appl Phys, Chengdu 610054, Peoples R China.
EM fuhao@uestc.edu.cn
FU U.S. Department of Energy [DE-AC02-07CH11358]; Office of Basic Energy
Sciences, Materials Sciences Division of the Office of Science; China
Scholarship Council; National Natural Science Foundation of China
[50901013]
FX The Ames Laboratory is operated by Iowa State University of Science and
Technology for the U.S. Department of Energy under contract No.
DE-AC02-07CH11358. Work at Ames Laboratory is supported by the Office of
Basic Energy Sciences, Materials Sciences Division of the Office of
Science. H. Fu.'s work at the Ames Laboratory was also supported by the
China Scholarship Council and the National Natural Science Foundation of
China (Grant No. 50901013).
NR 23
TC 7
Z9 8
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 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD SEP 1
PY 2010
VL 108
IS 5
AR 053916
DI 10.1063/1.3481923
PG 4
WC Physics, Applied
SC Physics
GA 658GQ
UT WOS:000282478900070
ER
PT J
AU Kim, HS
Christen, HM
Biegalski, MD
Singh, DJ
AF Kim, H. S.
Christen, H. M.
Biegalski, M. D.
Singh, D. J.
TI Proximity to a ferroelectric instability in Ba1-xCaxZrO3
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID LEAD-FREE PIEZOCERAMICS; GROUND-STATE; MULTIFERROICS; DEPENDENCE
AB Ferroelectricity in ABO(3) perovskites driven by A-site disorder is seen as a powerful approach toward lead-free piezoelectrics and ferroelectrics as well as to forming multiferroic compounds. Here we investigate the Ba1-xCaxZrO3 solid solution by structural and dielectric measurements on pulsed laser deposition grown films and by first principles calculations. Films on SrRuO3-coated SrTiO3 substrates are studied for x between 0 and 0.44. Despite the expectation that the Ca-ions assume off-center positions in the perovskite lattice, dielectric measurements show no evidence for ferroelectricity. This behavior is explained by first principles supercell calculations that show ferroelectricity at expanded volume but a rapid suppression thereof as the volume is reduced, thus indicating that our paraelectric Ba1-xCaxZrO3 films are close to a ferroelectric instability. These results demonstrate the important interplay between unit cell volume and ferroelectricity arising from off-centered ions. (C) 2010 American Institute of Physics. [doi:10.1063/1.3476287]
C1 [Kim, H. S.; Christen, H. M.; Singh, D. J.] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
[Christen, H. M.; Biegalski, M. D.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA.
RP Kim, HS (reprint author), Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.
EM christenhm@ornl.gov
RI Singh, David/I-2416-2012; Christen, Hans/H-6551-2013
OI Christen, Hans/0000-0001-8187-7469
FU Department of Energy, Division of Materials Sciences and Engineering;
Division of Scientific User Facilities; Office of Naval Research
FX This work was supported by the Department of Energy, Division of
Materials Sciences and Engineering (H.K., H.C., and D.S.) and the
Division of Scientific User Facilities (M.B.), and by the Office of
Naval Research (D.S.).
NR 24
TC 2
Z9 3
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 SEP 1
PY 2010
VL 108
IS 5
AR 054105
DI 10.1063/1.3476287
PG 5
WC Physics, Applied
SC Physics
GA 658GQ
UT WOS:000282478900077
ER
PT J
AU Morozovska, AN
Eliseev, EA
Balke, N
Kalinin, SV
AF Morozovska, A. N.
Eliseev, E. A.
Balke, N.
Kalinin, S. V.
TI Local probing of ionic diffusion by electrochemical strain microscopy:
Spatial resolution and signal formation mechanisms
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID ATOMIC-FORCE MICROSCOPY; IN-SITU AFM; INTERCALATION-INDUCED STRESS;
LITHIUM-ION; THIN-FILMS; DYNAMIC-BEHAVIOR; SURFACE; LI; BATTERIES;
LICOO2
AB Electrochemical insertion-deintercalation reactions are typically associated with significant change in molar volume of the host compound. This strong coupling between ionic currents and strains underpins image formation mechanisms in electrochemical strain microscopy (ESM), and allows exploring the tip-induced electrochemical processes locally. Here we analyze the signal formation mechanism in ESM, and develop the analytical description of operation in frequency and time domains. The ESM spectroscopic modes are compared to classical electrochemical methods including potentiostatic and galvanostatic intermittent titration, and electrochemical impedance spectroscopy. This analysis illustrates the feasibility of spatially resolved studies of Li-ion dynamics on the sub-10-nm level using electromechanical detection. (C) 2010 American Institute of Physics. [doi :10.1063/1.3460637]
C1 [Morozovska, A. N.] Natl Acad Sci Ukraine, Inst Semicond Phys, UA-03028 Kiev, Ukraine.
[Eliseev, E. A.] Natl Acad Sci Ukraine, Inst Problems Mat Sci, UA-03142 Kiev, Ukraine.
[Balke, N.; Kalinin, S. V.] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37922 USA.
RP Morozovska, AN (reprint author), Natl Acad Sci Ukraine, Inst Semicond Phys, 41 Pr Nauki, UA-03028 Kiev, Ukraine.
EM sergei2@ornl.gov
RI Kalinin, Sergei/I-9096-2012; Balke, Nina/Q-2505-2015
OI Kalinin, Sergei/0000-0001-5354-6152; Balke, Nina/0000-0001-5865-5892
FU U.S. Department of Energy, Office of Science, Office of Basic Energy
Sciences [ERKCC61]
FX This material is based upon work supported as part of the Fluid
Interface Reactions, Structures and Transport (FIRST) Center, an Energy
Frontier Research Center funded by the U.S. Department of Energy, Office
of Science, Office of Basic Energy Sciences under Award No. ERKCC61
(N.B. and S.V.K.). Research at the ORNL's Center for Nanophase Materials
Sciences in the project under Project Nos. CNMS2010-098 and CNMS2010-099
was sponsored by the Scientific User Facilities Division, Office of
Basic Energy Sciences, U.S. Department of Energy (N.B.). N.B.
acknowledges the Alexander von Humboldt foundation for financial
support. A.N.M. and E.A.E. gratefully acknowledge financial support from
National Academy of Science of Ukraine, Ministry of Science and
Education of Ukraine (Grant No. UU30/ 004) and National Science
Foundation (Grant No. DMR0908718). S.V.K. and N.B. gratefully
acknowledge S. J. Pennycook and R. E. Garcia for valuable discussions.
NR 78
TC 63
Z9 63
U1 4
U2 75
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 SEP 1
PY 2010
VL 108
IS 5
AR 053712
DI 10.1063/1.3460637
PG 21
WC Physics, Applied
SC Physics
GA 658GQ
UT WOS:000282478900045
ER
PT J
AU Stevens, LL
Hooks, DE
Migliori, A
AF Stevens, Lewis L.
Hooks, Daniel E.
Migliori, Albert
TI A comparative evaluation of elasticity in pentaerythritol tetranitrate
using Brillouin scattering and resonant ultrasound spectroscopy
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID STIMULATED LIGHT-SCATTERING; SINGLE-CRYSTALS; MOLECULAR-SOLIDS;
CONSTANTS; EXPLOSIVES
AB Elastic tensors for organic molecular crystals vary significantly among different measurements. To understand better the origin of these differences, Brillouin scattering and resonant ultrasound spectroscopy measurements were made on the same specimen for single crystal pentaerythritol tetranitrate. The results differ significantly despite mitigation of sample-dependent contributions to errors. The frequency dependence and vibrational modes probed for both measurements are discussed in relation to the observed tensor variance. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3467523]
C1 [Stevens, Lewis L.; Hooks, Daniel E.; Migliori, Albert] Los Alamos Natl Lab, Los Alamos, NM 87545 USA.
RP Stevens, LL (reprint author), Los Alamos Natl Lab, POB 1663, Los Alamos, NM 87545 USA.
EM dhooks@lanl.gov
FU National Nuclear Security Administration Science Campaign 2; Office of
Naval Research [N0001402F0128]
FX This work was supported by the National Nuclear Security Administration
Science Campaign 2 and the Office of Naval Research (Grant No.
N0001402F0128). We thank Kyle Ramos, Frank Abeyta, and Tim Pierce for
their assistance in sample preparation, Brian Patterson for performing
X-ray tomography, and Kyle Ramos and David Black for performing X-ray
topography.
NR 34
TC 7
Z9 7
U1 0
U2 4
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 SEP 1
PY 2010
VL 108
IS 5
AR 053512
DI 10.1063/1.3467523
PG 4
WC Physics, Applied
SC Physics
GA 658GQ
UT WOS:000282478900025
ER
PT J
AU Ye, J
Li, YH
Averback, R
Zuo, JM
Bellon, P
AF Ye, Jia
Li, Youhong
Averback, Robert
Zuo, Jian-Min
Bellon, Pascal
TI Atomistic modeling of nanoscale patterning of L1(2) order induced by ion
irradiation
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID TRANSMISSION-ELECTRON-MICROSCOPY; MOLECULAR-DYNAMICS-SIMULATION;
ENERGETIC DISPLACEMENT CASCADES; MONTE-CARLO SIMULATIONS; DEFECT
PRODUCTION; DAMAGE; METALS; CU3AU; ALLOYS; KINETICS
AB Theoretical predictions indicate that ordered alloys can spontaneously develop a steady-state nanoscale microstructure when irradiated with energetic particles. This behavior derives from a dynamical competition between disordering in cascades and thermally activated reordering, which leads to self-organization of the chemical order parameter. We test this possibility by combining molecular dynamics (MD) and kinetic Monte Carlo (KMC) simulations. We first generate realistic distributions of disordered zones for Ni3Al irradiated with 70 keV He and 1 MeV Kr ions using MD and then input this data into KMC to obtain predictions of steady state microstructures as a function of the irradiation flux. Nanoscale patterning is observed for Kr ion irradiations but not for He ion irradiations. We illustrate, moreover, using image simulations of these KMC microstructures, that high-resolution transmission electron microscopy can be employed to identify nanoscale patterning. Finally, we indicate how this method could be used to synthesize functional thin films, with potential for magnetic applications. (C) 2010 American Institute of Physics. [doi:10.1063/1.3474668]
C1 [Ye, Jia; Averback, Robert; Zuo, Jian-Min; Bellon, Pascal] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
[Li, Youhong; Averback, Robert; Zuo, Jian-Min] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA.
[Ye, Jia] Lawrence Berkeley Lab, Berkeley, CA 94720 USA.
[Li, Youhong] Zodiac Aerosp, Engn Mat Arresting Syst, Logan Township, NJ 08085 USA.
RP Ye, J (reprint author), Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
EM bellon@uiuc.edu
FU National Science Foundation [DMR 04-07958, DMR 08-04615]; Materials
Computation Center at the University of Illinois [NSF-DMR 99-76550,
NSF-DMR 03-25939]
FX This material is based upon work supported by National Science
Foundation under Grant Nos. DMR 04-07958 and DMR 08-04615, and by the
Materials Computation Center at the University of Illinois, under Grant
Nos. NSF-DMR 99-76550 and NSF-DMR 03-25939. We also thank Intel for its
generous donation and the Frederick Seitz Materials Research Laboratory
Center for Computation for its technical assistance.
NR 45
TC 1
Z9 1
U1 2
U2 20
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 SEP 1
PY 2010
VL 108
IS 5
AR 054302
DI 10.1063/1.3474668
PG 7
WC Physics, Applied
SC Physics
GA 658GQ
UT WOS:000282478900082
ER
EF